Entries |
Document | Title | Date |
20080209886 | Method for Controlling an Operation of a Heatable Exhaust-Gas Sensor of a Motor Vehicle - A method is for controlling the operation of an exhaust-gas sensor disposed in an exhaust duct of a motor vehicle and equipped with an internal or external sensor heating device, the motor vehicle including a combustion engine and an automatic switchoff, which causes an automatic switching off of the combustion engine when at least one stop condition is present. It is provided that: (a) following an automatic switching off of the combustion engine by the automatic switchoff, a first future instant is determined at which the exhaust-gas temperature in the exhaust duct will drop below a condensation temperature below which condensate precipitation from the exhaust gas may occur; (b) a second instant is determined at which a heat output of the sensor heating device must be interrupted or reduced so that a sensor temperature of the exhaust-gas sensor will have dropped to a maximally allowed sensor temperature no later than the first future instant; and the heat output of the sensor heating device is interrupted or reduced when the second instant is attained. | 09-04-2008 |
20080209887 | EXHAUST THROTTLE VALVE DIAGNOSING DEVICE AND METHOD - When switching an exhaust throttle valve from full opening to a closed position to warm up an engine, an intake throttle valve is fixed to full opening, an EGR valve is fixed to full closing, and a variable turbo-vane is fixed to a predetermined opening degree to accelerate a gas flow rate from an intake passage to an exhaust passage, a fully opened flow rate is detected and stored by gas flow rate detection means, with the exhaust throttle valve being full opening, after which an instruction is issued to the exhaust throttle valve to switch from the full opening to a closed position for detecting a closed position flow rate, a flow rate difference is determined by deducting the detected closed position flow rate from the stored fully opened flow rate, and failure of the exhaust throttle valve is judged when the flow rate difference is less than a predetermined threshold value. | 09-04-2008 |
20080229730 | NOx TRAPPING CATALYTIC CONVERTER DIAGNOSTIC APPARATUS - A NOx trapping catalytic converter diagnostic apparatus basically has a particulate matter accumulation estimating component, a particulate matter accumulation detecting component and a deterioration determining component. The particulate matter accumulation estimating component is configured to estimate an estimated amount of particulate matter accumulated a particulate matter filter that is positioned downstream of a NOx trapping catalytic converter. The particulate matter accumulation detecting component is configured to detect a detected amount of particulate matter accumulated in the particulate matter filter. The deterioration determining component is configured to determine if deterioration of the NOx trapping catalytic converter has occurred based on the estimated amount of accumulated particulate matter and the detected amount of accumulated particulate matter without using a NOx sensor to determine if the NOx trapping catalytic converter has deteriorated. | 09-25-2008 |
20080256928 | SYSTEM AND METHOD FOR QUANTIZING FUEL DILUTION OF ENGINE MOTOR DUE TO POST-INJECTION FUELING TO REGENERATE AN EXHAUST AFTERTREATMENT DEVICE - A system and method for estimating the effect of forced regeneration of a diesel particulate filter ( | 10-23-2008 |
20080264037 | Apparatus for deterioration diagnosis of an oxidizing catalyst - An unburned fuel supply section performs temperature rise control to supply fuel to an oxidizing catalyst disposed upstream of an exhaust purification device to cause temperature rise of the exhaust purification device using heat generated in oxidation reaction of fuel on the catalyst. During the temperature rise control, an actual cumulative fuel quantity calculation section obtains actual cumulative fuel quantity by accumulating the amount of fuel supplied to the catalyst. A theoretical cumulative fuel quantity calculation section calculates fuel supply quantity required for temperature rise of the exhaust purification device on the premise that oxidation performance of the catalyst is not deteriorated, and obtains theoretical cumulative fuel quantity by accumulating the calculated fuel supply quantity. After the temperature rise control ends, a deterioration determination section determines whether the catalyst is deteriorated, on the basis of the ratio between the actual cumulative fuel quantity and the theoretical cumulative fuel quantity. | 10-30-2008 |
20080271435 | Deterioration Diagnosis System for an Air-Fuel Ratio Sensor - A deterioration diagnosis system for an air fuel sensor mounted to an exhaust pipe of an internal combustion engine. The air fuel sensor determines a mixture ratio of air and fuel fed into the internal combustion engine. In the system, an inclination of an output signal of the air-fuel ratio sensor is calculated; variance of the inclination is calculated; deterioration of the air-fuel ratio sensor is determined based on the variance of the inclination. | 11-06-2008 |
20080295489 | Method and an Arrangement for Monitoring the Functioning of a Sensor or an Exhaust Gas Aftertreatment System - A monitoring method and a monitoring arrangement, wherein: (a) first comparison value is established based on information from a sensor as to the measured magnitude of a parameter related to exhaust gases flowing out of an exhaust gas aftertreatment appliance included in an exhaust aftertreatment system; b) a second comparison value corresponding to the first comparison value is established based on a value representing the magnitude of said parameter calculated on the basis of a calculation model; c) a difference value representing the difference between said comparison values is established; d) steps a)-c) are repeated during a certain period of time and a variance value representing the variance of the difference value during this period of time is established; and e) the variance value is compared with a given threshold value for generation of information regarding the functioning of the sensor or the system. | 12-04-2008 |
20080302086 | Electrically heated particulate filter diagnostic systems and methods - A system that diagnoses regeneration of an electrically heated particulate filter is provided. The system generally includes a grid module that diagnoses a fault of the grid based on at least one of a current signal and a voltage signal. A diagnostic module at least one of sets a fault status and generates a warning signal based on the fault of the grid. | 12-11-2008 |
20080302087 | Exhaust system monitoring methods and systems - A diagnostic system for an exhaust system including a catalyst and a post-catalyst oxygen sensor is provided. The system generally includes a fuel control module that commands fuel to transition from a rich condition to a lean condition and that commands fuel to transition from the lean condition to the rich condition. A first diagnostic module monitors the post-catalyst oxygen sensor during the transition from the rich condition to the lean condition. A second diagnostic module monitors the catalyst during the transition from the lean condition to the rich condition. | 12-11-2008 |
20090013666 | METHOD FOR DETERMINING MALFUNCTION OF NITROGEN OXIDE SENSOR AND SELECTIVE CATALYTIC REDUCTION SYSTEM OPERATING THE SAME - A method for determining malfunction of a nitrogen oxide sensor compares a nitrogen oxide amount detected by the sensor with a predetermined value of nitrogen oxide. If the difference between the predetermined value and the amount detected by the sensor is within a predetermined range, the method determines whether an engine is in a steady state. If the engine is in a steady state, the method changes one or more engine control parameters, thereby varying an actual nitrogen oxide amount. After changing the parameters, the method determines whether the amount detected by the sensor changes. The method determines that the sensor is malfunctioning if the amount detected by the sensor does not change. A selective catalytic reduction system includes a first nitrogen oxide sensor, a selective catalytic reduction apparatus, and a second nitrogen oxide sensor, all disposed in an exhaust pipe. A control portion performs the above-described method. | 01-15-2009 |
20090019833 | APPARATUS, SYSTEM, AND METHOD FOR DETERMINING A TIME-TEMPERATURE HISTORY OF AN AFTERTREATMENT DEVICE - An apparatus, system, and method are disclosed for determining a time-temperature history of an aftertreatment device. The apparatus includes an aftertreatment device comprising a substrate, and at least one thermal monitoring member (TMM) in thermal contact with the substrate. The TMMs may comprise a material that exhibits an electrical resistivity change at temperature over time. The apparatus may include a controller configured to measure the electrical resistivity of at least a portion of the TMMs, and to determine a thermal history based on the electrical resistivity measures. | 01-22-2009 |
20090019834 | CATALYST DETERIORATION DEGREE ACQUIRING APPARATUS IN INTERNAL COMBUSTION ENGINE - The apparatus obtains a decreasing gradient of the maximum oxygen storing quantity Cmax with respect to the increase in an air flow rate Ga on the basis of two maximum oxygen storing quantities Cmax, which are respectively estimated in case where the air flow rate Ga assumes two different values, and the two values of the air flow rate Ga. As the deterioration degree of the catalyst unit | 01-22-2009 |
20090038288 | Filter Clogging Determination Apparatus for Diesel Engine - A clogging determination apparatus determines clogging of a DPF (Diesel Particulate Filter) such that exhaust pressure is estimated using a sensor deigned for regular control of an engine, without using exhaust pressure sensor. The apparatus includes: the DPF disposed in an exhaust system; an exhaust sensor that measures an air-fuel ratio λ in exhaust gas; and an injector that changes the air-fuel ratio in an cylinder through post-injection. A response time T taken for the exhaust sensor to detect a change in the air-fuel ratio is measured from the time when the post-injection is output from the injector. If this response time T is longer than a clogging determination response time To, the apparatus determines that the DPF is clogged. | 02-12-2009 |
20090044515 | SYSTEM AND METHOD FOR REMOVING PARTICULATE MATTER FROM A DIESEL PARTICULATE FILTER - A system is provided for removing particulate matter from a diesel particulate filter. The diesel particulate filter includes at least one diesel particulate filter unit to filter particulate matter from diesel engine exhaust gas received from a diesel engine. The system includes a sensor positioned adjacent to at least one diesel particulate filter unit, where the sensor is configured to determine the extent of particulate matter trapped within the diesel particulate filter unit. The system further includes an engine controller coupled to the sensor and the diesel engine, where the sensor is configured to output a first alert signal to the engine controller upon determining that the trapped particulate matter exceeds a predetermined threshold. The engine controller is configured to increase the temperature of the diesel exhaust gas entering the diesel particulate filter upon receiving the first alert signal. | 02-19-2009 |
20090056313 | TEST METHOD FOR AN EXHAUST GAS PROBE OF AN INTERNAL COMBUSTION ENGINE, IN PARTICULAR FOR A LAMBDA PROBE - A test method for an exhaust gas probe ( | 03-05-2009 |
20090064663 | METHOD AND APPARATUS FOR DETERMINING TEMPERATURE IN A GAS FEEDSTREAM - An internal combustion engine includes an exhaust gas feedstream flowing past a gas sensing device disposed therein. The gas sensor includes an integrated electrical heating element which provides a resistance indicative of its temperature. An unknown input observer is used to determine the exhaust gas feedstream temperature based on the heating element temperature. | 03-12-2009 |
20090090097 | Method and apparatus for detecting a non-operational status of a catalyst in an engine exhaust conduit - A quantity of unburned fuel is provided through a combustion chamber of an engine and an exhaust conduit to a catalytic converter. The catalyst in the converter is determined to be non-operational if a post-catalyst temperature sensor does not indicate a sufficient temperature increase between readings before and after provision of the unburned fuel to the combustion chamber. The unburned fuel may be provided by withholding spark ignition to create a misfire in the combustion chamber or, particularly in a direct injection engine, by injecting the fuel during the exhaust stroke. | 04-09-2009 |
20090107114 | Particulate trap temperature sensor swap detection - An exhaust after-treatment system is disclosed. The system has a particulate trap disposed to remove particulate matter from an exhaust flow of an engine, an upstream temperature sensor disposed to measure a temperature of the exhaust flow upstream of the particulate trap, and a downstream temperature sensor disposed to measure a temperature of the exhaust flow downstream of the particulate trap. The system also has a controller in communication to receive from the upstream and downstream temperature sensors indications of the upstream and downstream temperatures. The controller is configured to compare the upstream and downstream temperatures, determine if the upstream and downstream temperature sensors are improperly swapped based on the comparison, and take a precaution if it is determined that the upstream and downstream temperature sensors are improperly swapped. | 04-30-2009 |
20090113875 | Exhaust Gas Purifying Apparatus for Internal Combustion Engine - An exhaust gas purifying apparatus for an internal combustion engine is provided. The apparatus includes a recoverable type exhaust gas purifying device provided in an exhaust passage, a reducing agent addition device for adding a reducing agent into the exhaust passage upstream of the exhaust gas purifying device, an operation control device for controlling operation of the reducing agent addition device such that the reducing agent is added into the exhaust passage in a recovering process of the exhaust gas purifying device, a pressure obtaining device for obtaining pressure in the exhaust passage downstream from the reducing agent addition device and upstream from the exhaust gas purifying device; and a diagnosing device for diagnosing the reducing agent addition device based on the pressure obtained by the pressure obtaining device at an estimate arrival-time when the reducing agent added from the reducing agent addition device is estimated to arrive at the exhaust gas purifying device in a case the operation of the reducing agent addition device is controlled by the operation control device such that the reducing agent is added into the exhaust passage. | 05-07-2009 |
20090120062 | METHOD FOR THE NON-DESTRUCTIVE CONTROL OF A PARTICLE FILTER AND ASSOCIATED DEVICE - A nondestructive method for detecting internal defects of a filter, for example a catalytic filter, and a device for implementing the method. The method may be used in particular for treating a gas laden with soot particulates. The filter includes a honeycomb filter element or a plurality of honeycomb filter elements. In the method the presence or absence of the defects is determined by measuring a propagation of a gas stream such as air through the filter element or elements. | 05-14-2009 |
20090133385 | EXHAUST PURIFICATION DEVICE OF INTERNAL COMBUSTION ENGINE, AND CONTROL METHOD THEREOF - An exhaust purification device includes a particulate filter ( | 05-28-2009 |
20090139211 | TIMER-BASED WARNING STRUCTURE FOR DETECTING AND INDICATING AN OVERLOADED DIESEL PARTICULATE FILTER - An engine ( | 06-04-2009 |
20090139212 | DIAGNOSTIC DEVICE FOR NOx SENSOR - The ECU performs an on-board diagnosis for a NOx sensor. The diagnosis is carried out when an exhaust system of an engine is fully cooled after shut-down of the engine. The diagnosis is carried out after a temperature in the exhaust passage is lowered to an ambient temperature. In the diagnosis proceeding, the ECU activates a heater attached on the NOx sensor. The ECU detects a heating performance of the heater and determines whether the heating performance is sufficient or not. The NOx sensor is in a stable condition after the engine system is fully cooled. Therefore, it is possible to perform the diagnosis while eliminating or suppressing influences of operating conditions of the engine system and a residual heat in the exhaust system. | 06-04-2009 |
20090139213 | ABNORMALITY DIAGNOSIS DEVICE OF INTERNAL COMBUSTION ENGINE - A deviation amount of a downstream air-fuel ratio sensed with a downstream air-fuel ratio sensor, which senses an air-fuel ratio of exhaust gas downstream of a catalyst, from a target air-fuel ratio is integrated during a period in which the downstream air-fuel ratio continuously shows deviations from the target air-fuel ratio while main feedback control and sub feedback control are performed based on outputs of an upstream air-fuel ratio sensor and the downstream air-fuel ratio sensor respectively. The thus-calculated continuous deviation amount of the downstream air-fuel ratio (deterioration degree of exhaust gas purification rate) is compared with an abnormality determination value to determine existence/nonexistence of an abnormal state where the exhaust gas purification rate is deteriorated by an air-fuel ratio variation among cylinders (i.e., state where control center of main feedback control has shifted). | 06-04-2009 |
20090145110 | APPARATUS FOR DIAGNOSING EXHAUST GAS PURIFYING DEVICE - In an apparatus for diagnosing an exhaust gas purifying device, a catalyst deterioration level detector | 06-11-2009 |
20090145111 | PROBLEM DETECTION APPARATUS AND METHOD IN EXHAUST PURIFYING APPARATUS - An exhaust purifying apparatus is provided with a filter located in an exhaust path of an internal combustion engine and configured to collect particulates in exhaust gas. The exhaust purifying apparatus is also provided with a differential pressure sensor which detects the pressure difference generated between the upstream side and downstream side of the filter. The problem detection apparatus of the exhaust purifying apparatus is provided with a differential pressure calculation unit and a judgment unit. The differential pressure calculation unit calculates the pressure difference between the upstream and downstream sides of the filter based on the operating state of the internal combustion engine. The judgment unit calculates a difference P between an actual measurement value of the pressure difference and a calculation differential pressure value compares the difference P with a threshold value, and detects that the filter has a problem. | 06-11-2009 |
20090151326 | METHOD FOR THE DIAGNOSING OF A CATALYTIC CONVERTER LOCATED IN AN EXHAUST GAS FLOW, AND DEVICE FOR CARRYING OUT SAID METHOD - Disclosed are a method and a device for diagnosing a catalytic converter ( | 06-18-2009 |
20090158709 | EXHAUST EMISSION PURIFYING APPARATUS FOR ENGINE - In order to suppress deposition of constituent of a reducing agent (dissolved matter) in an exhaust passage of an engine enhancing an elimination rate of NOx even when temperature of an exhaust emission from the engine is low, an exhaust emission purifying apparatus is provided with an electro-generative-heat carrier provided on an upstream side of an injection nozzle that supplies the reducing agent into the exhaust emission on upstream side of a reduction catalyst in an exhaust pipe, the exhaust emission being heated to a temperature equal to or higher than a melting point of the dissolved matter whereby deposition of the dissolved matter on an inner wall surface of the exhaust pipe is suppressed to effectively use the supplied reducing agent for catalytic reduction reaction, even when the exhaust emission temperature is lower than the melting point of the dissolved matter of the reducing agent. | 06-25-2009 |
20090173059 | SULPHUR OXIDE (SOX) REMOVAL METHOD AND SYSTEM AND STOP MODULE FOR SAID SYSTEM - The invention relates to a system for the removal of SOx (sulphur oxide) stored in a nitrogen oxide (NOx) trap associated with an oxidation catalyst and disposed in an exhaust line of an engine, said system including a stop module ( | 07-09-2009 |
20090205318 | FAULT DETECTION SYSTEM FOR PM TRAPPER - An object of the present invention is to provide a technology that enables to detect a fault of a PM trapper with improved accuracy. According to the present invention, a plurality of temperature sensors | 08-20-2009 |
20090211233 | Abnormality determination apparatus for electrically heated catalyst - An abnormality determination apparatus for an electrically heated catalyst provided in a plug-in hybrid vehicle having a battery that is charged by connecting an external charging device to an external electric power supply is equipped with an abnormality determination portion that makes a determination on an abnormality in the electrically heated catalyst when the external charging device is connected to the external electric power supply. | 08-27-2009 |
20090260347 | APPARATUS AND METHOD FOR DETECTING ABNORMAL AIR-FUEL RATIO VARIATION AMONG CYLINDERS OF MULTI-CYLINDER INTERNAL COMBUSTION ENGINE - An apparatus and a method for detecting abnormal air-fuel ratio variation among cylinders of a multi-cylinder internal combustion engine are provided. The apparatus includes: a catalyst that is provided in an exhaust passage of the multi-cylinder internal combustion engine; a catalyst temperature detection unit that detects a temperature of the catalyst; a catalyst temperature estimation unit that estimates a temperature of the catalyst based on an engine operating state; and an abnormality detection unit that determines whether abnormal air-fuel ratio variation among the cylinders has occurred based on the detected temperature of the catalyst and the estimated temperature of the catalyst. | 10-22-2009 |
20090266053 | EXHAUST GAS PURIFICATION SYSTEM FOR INTERNAL COMBUSTION ENGINE - An exhaust gas purification system includes: at least two catalysts ( | 10-29-2009 |
20090266054 | Control Apparatus and Method for Internal Combustion Engine - A control apparatus for an internal combustion engine has an oxygen storage volume computing unit for computing an oxygen storage volume of a catalyst by using a real air/fuel ratio detected by an air/fuel ratio sensor installed on the upstream side of a catalyst, a center air/fuel ratio representing a stoichiometric air/fuel ratio and an estimated air flow volume or detecting a flow rate of air flowing into the catalyst. A center air/fuel ratio correcting unit for correcting a center air/fuel ratio based on output of a rear air/fuel ratio sensor provided on the downstream side of the catalyst, and an oxygen storage volume computed by an oxygen storage volume computing unit, and the oxygen storage volume computing unit computes an oxygen storage volume by using a center air/fuel ratio corrected by the center air/fuel ratio correcting unit. | 10-29-2009 |
20090272099 | APPARATUS, SYSTEM, AND METHOD FOR DETERMINING THE DEGRADATION OF AN SCR CATALYST - According to one representative embodiment, an apparatus for determining the degradation of a selective catalytic reduction (SCR) catalyst of an engine exhaust aftertreatment system includes a system properties module configured to store at least one system dynamics property value of the exhaust system at a first time and receive the at least one system dynamics property value of the exhaust aftertreatment system at a second time subsequent to the first time. The apparatus also includes a system dynamics module configured to determine a storage capacity of the SCR catalyst based on a comparison between the at least one system dynamic property value at the first time and the at least one system dynamic property value at the second time. Additionally, the apparatus includes an SCR catalyst degradation factor module configured to determine an SCR catalyst degradation factor based at least partially on the storage capacity of the SCR catalyst. | 11-05-2009 |
20090282808 | Method and system for improving sensor accuracy - A method and system for improving sensor accuracy of diesel emissions is disclosed. The method and system change the sensor reading as a function of sensor age to provide a more accurate measure of the diesel emissions. By estimating the degree of sensor error and then providing a gain correction factor as a function of sensor age, a more accurate measure of the diesel emissions is provided. | 11-19-2009 |
20090301059 | EXHAUST PURIFICATION DEVICE OF INTERNAL COMBUSTION ENGINE - In an internal combustion engine, an NO | 12-10-2009 |
20090320451 | Exhaust purification device of internal combustion engine - In an internal combustion engine, an SO | 12-31-2009 |
20090320452 | METHOD FOR DETERMINING THE AMOUNT OF PARTICULATE ACCUMULATED IN A PARTICULATE FILTER - A method for determining the amount of particulate that has accumulated in a particulate filter, comprising calculating an amount of particulate that has accumulated in the particulate filter on the basis of a physical model that uses measured and/or determined physical quantities, and subjecting the calculated particulate amount to validation on the basis of given validation criteria, the latter step envisaging validation of the calculated particulate amount in the case where said criteria are satisfied, and validation of a substitutive particulate amount which is a function of a previously validated amount and of an admissible rate of variation in the case where said criteria are not satisfied. | 12-31-2009 |
20100005782 | Internal Combustion Engine Exhaust Filtration Analysis System - A system for analyzing a substrate material for a diesel or other internal combustion engine exhaust filtration performance includes a valve that actuates within an exhaust system to modulate engine exhaust back pressure and correspondingly maintain a desired filtration velocity to influence a variable parameter within the system, based at least in part on an exhaust characteristic such as a sensed exhaust pressure differential defined across a substrate material. | 01-14-2010 |
20100005783 | DEVICE FOR MONITORING AN EXHAUST GAS CATALYTIC CONVERTER FOR AN INTERNAL COMBUSTION ENGINE - A device for monitoring an exhaust gas catalytic converter in the exhaust system of an internal combustion engine, includes a measuring apparatus that is arranged in the exhaust system in such a way that, in the greatest part of the operating range of the internal combustion engine, it assumes a temperature that is correlated with a temperature of the exhaust gas catalytic converter. The measuring apparatus has a temperature-sensitive component with a temperature-dependent characteristic component parameter that changes either abruptly at a predetermined transition temperature or temperature range, or continuously in a predetermined way as a function of the temperature. A control and evaluation unit connected to the measuring arrangement detects the characteristic component parameter and/or a change in the latter, and correlates it with an aging state of the exhaust gas catalytic converter. | 01-14-2010 |
20100011744 | Method And Device For The Diagnosis Of The Effectiveness Of A Catalytic Converter - In a method and a device for the diagnosis of the effectiveness of a catalytic converter in the exhaust gas line when using a very late afterinjection or secondary injection, in order to provide a sensitive and yet robust diagnostic method while saving costs for additional exhaust gas temperature sensors and with fuel consumption increased only to a minimum extent, the diagnostic method delivering reliable results with only little delay, and a corresponding device which can also easily be used in various concepts for internal combustion engines, an increased compressor output, caused in the course of the test injection, of an exhaust gas turbocharger used downstream of the catalytic converter produce a higher charge pressure or a marked increase in the air mass flow (mL) such that the effectiveness of the catalytic converter is determined from a change in the intake air quantity of the internal combustion engine. | 01-21-2010 |
20100011745 | Vehicle Diesel Engine and Control Method of the Same - A diesel engine includes: a PM filter provided in its exhaust passage; a fuel injection valve for performing post fuel injection in a cylinder of an engine body in addition to primary fuel injection, in order to supply fuel to the PM filter, to maintain its purification performance; an oil level sensor for detecting a degree of dilution of engine oil; and a first indicator lamp that is turned on to indicate that the engine oil needs to be changed when the degree of dilution of engine oil detected by the oil level sensor is equal to or greater than an allowable level. The vehicle diesel engine overrides the prohibition of the post fuel injection until a distance traveled by the vehicle after the indicator lamp is turned on reaches a predetermined distance. | 01-21-2010 |
20100018186 | FAULT DETECTION SYSTEM FOR PM TRAPPER - An object of the present invention is to provide a technology that enables detection of a fault of a PM trapper with improved accuracy. In the present invention, a pressure sensor | 01-28-2010 |
20100024395 | CONTROL METHOD OF EXHAUST EMISSION PURIFICATION SYSTEM AND EXHAUST EMISSION PURIFICATION SYSTEM - In a control method of an exhaust emission purification system ( | 02-04-2010 |
20100031634 | DETERIORATION DETERMINATION DEVICE AND METHOD FOR EXHAUST EMISSION REDUCTION DEVICE, AND ENGINE CONTROL UNIT - A deterioration determination device for an exhaust emission reduction device which is capable of accurately and rapidly determining deterioration of a NOx purifying catalyst. The deterioration determination device for the exhaust emission reduction device for determining deterioration of the NOx purifying catalyst includes an ECU. The ECU executes high NOx concentration control in deterioration determination, calculates a NOx supply amount based on upstream NOx concentration detected during execution of the high NOx concentration control, calculates a NOx slip amount based on downstream NOx concentration detected during execution of the high NOx concentration control, and determines the NOx purifying catalyst to be deteriorated when the condition of the NOx slip amount >a reference value is satisfied, in a case where the NOx supply amount> a reference value holds. | 02-11-2010 |
20100037592 | METHOD AND DEVICE FOR DIAGNOSING AN EXHAUST GAS CATALYTIC CONVERTER - A first exhaust gas sensor signal (vls_up) of a first exhaust gas sensor (AS | 02-18-2010 |
20100050601 | EXHAUST GAS PURIFIER OF CONSTRUCTION MACHINE - [PROBLEM] To provide an exhaust gas purification system suitable for a construction machine provided with a hydraulic pump driven by an engine. | 03-04-2010 |
20100050602 | DETERIORATION DIAGNOSING APPARATUS FOR EXHAUST GAS PURIFYING CATALYST - Two different flows for air-fuel mixture are formed by two different variational amounts for changing the air-fuel ratio of the mixture. Response delay times for different exhaust gas flows are measured as time periods from a first time point at which the air-fuel ratio of the mixture is changed to a second time point at which an output of an oxygen sensor is changed. The oxygen sensor is provided in an exhaust pipe of an engine at a downstream side of an exhaust gas purifying catalyst. A difference between the two response delay times is compared with a predetermined threshold value to carry out the diagnosis for the catalyst deterioration. | 03-04-2010 |
20100071349 | CLOGGING DETERMINING DEVICE FOR REDUCING AGENT PASSAGE AND CLOGGING DETERMINING METHOD FOR REDUCING AGENT PASSAGE - There are provided a clogging determining device for a reducing agent passage and a clogging determining method for a reducing agent passage, which can accurately detect clogging and estimate a clogged place when clogging occurs in any place of a supply line or a return line. | 03-25-2010 |
20100083636 | SYSTEM AND METHODS TO DETECT NON-UREA REDUCTANT FILLED IN A UREA TANK - A method for indicating a non-urea reductant fault in a powertrain including an internal combustion engine and an aftertreatment system having an aftertreatment device utilizing a catalyst to convert NOx includes monitoring a NOx content exiting the aftertreatment system subsequent to a powertrain start-up event through a test span, monitoring a measure of NOx content entering the aftertreatment system subsequent to a powertrain start-up event through the test span, and determining a measure of NOx conversion accomplished in the aftertreatment device based upon the NOx content exiting the aftertreatment system and the measure of NOx content entering the aftertreatment system. The method includes, through the test span, comparing the measure of NOx conversion determined at a start of the test span to the measure of NOx conversion at a later time within the test span. A non-urea reductant fault is indicated based upon the comparing identifying a reduction in NOx conversion accomplished in the aftertreatment device between the start of the test span and the later time within the test span. | 04-08-2010 |
20100083637 | DEGRADATION DIAGNOSTIC APPARATUS FOR NOX CATALYST - A NOx amount capable of being absorbed by a criteria catalyst as a boundary between degradation and normality is supplied to a NOx storage reduction catalyst and thereafter, a reducer amount corresponding to the NOx amount is supplied by a rich spike operation. Degradation of the NOx catalyst is determined based upon the output of the NOx sensor at this time. Since the degradation of the NOx catalyst is determined only by a magnitude of the NOx sensor output, the degradation diagnosis can be performed with high precision. While the catalyst is normal, the excessive reducers are not supplied and therefore, deterioration of the fuel consumption can be prevented. | 04-08-2010 |
20100089035 | EXHAUST GAS CLEANING SYSTEM FOR CONSTRUCTION MACHINE - Before a large amount of PM is deposited in a filter | 04-15-2010 |
20100089036 | EXHAUST-GAS TREATMENT DEVICE HAVING A SENSOR FOIL - A device for exhaust-gas treatment includes at least one housing with an inner surface and at least one sensor foil disposed in the housing. The sensor foil is formed at least with a sensor element and a conductor element. The sensor foil is also provided with an edge up to which the conductor element extends and which bears against the inner surface of the housing. The housing also has an opening for contacting of the conductor element. The opening is surrounded on the inner surface by an electrical insulating layer. | 04-15-2010 |
20100101214 | DIAGNOSTIC METHODS FOR SELECTIVE CATALYTIC REDUCTION (SCR) EXHAUST TREATMENT SYSTEM - In an internal combustion engine system having an exhaust aftertreatment system including a selective catalytic reduction (SCR) catalyst, diagnostic methods involve the intrusive perturbation of a target surface coverage parameter theta to determine the state of health of the SCR catalyst or an ammonia concentration sensor. An adaptive learning block adapts the target theta based on the use of NH | 04-29-2010 |
20100115920 | Exhaust component having permanently associated life indicator - An exhaust component for use with a combustion engine is disclosed. The exhaust component may have a housing at least partially defining an inlet and an outlet, and a treatment device supported by the housing in communication with exhaust passing from the inlet to the outlet. The exhaust component may also have a life indicator permanently associated with at least one of the housing and the treatment device. | 05-13-2010 |
20100139247 | System and Method for Regenerating an Auxiliary Power Unit Exhaust Filter - This disclosure relates to a method for controlling a system for regenerating a diesel particulate filter. The method includes monitoring an engine run time that has lapsed since a previous regeneration event. The method also includes monitoring backpressure behind the diesel particulate filter. The method further includes triggering a regeneration flag if the engine run time that lapsed since the previous regeneration event reaches a predetermined time limit and the backpressure exceeds a minimum value. | 06-10-2010 |
20100146936 | Catalyst Deterioration Detection Device - A catalyst deterioration detector not causing false detection of catalyst deterioration by eliminating the influence of a variation of the state of the gas at the catalyst outlet on the oxygen storage amount. Setting the lean target A/F to afL | 06-17-2010 |
20100154386 | DIAGNOSTIC SYSTEMS AND METHODS FOR SELECTIVE CATALYTIC REDUCTION (SCR) SYSTEMS BASED ON NOx SENSOR FEEDBACK - A selective catalytic reduction (SCR) system includes a first sensor that determines a first concentration of NO | 06-24-2010 |
20100162687 | METHOD AND DEVICE FOR THE CONTROL OF THE OPERATING STATE OF THE CATALYTIC CONVERTER OF THE EXHAUST LINE OF AN INTERNAL COMBUSTION ENGINE - A device for controlling the operating state of a catalytic converter in the exhaust line of an internal combustion engine, including a mechanism for determining the temperature upstream and downstream of the converter, a mechanism for injecting fuel in the exhaust line of the engine, a mechanism for calibrating a temperature model on a measured operating temperature of the catalytic converter, and a mechanism for calculating the integral of the difference between the measured temperature and the modeled temperature downstream of the converter. | 07-01-2010 |
20100175370 | DEVICE AND METHOD FOR REGENERATING PARTICULATE FILTERS, USE OF A MEDIUM FOR REGENERATING PARTICULATE FILTERS, AND REFILL PACK COMPRISING SAID WITH THE MEDIUM - The invention relates to the use of a combustion fuel that differs from diesel or diesel cleavage products, in particular monoethylene glycol and/or methanol, for enriching exhaust gas in front of a particulate filter ( | 07-15-2010 |
20100180577 | APPARATUS AND METHOD FOR ONBOARD PERFORMANCE MONITORING OF EXHAUST GAS PARTICULATE FILTER - The present invention is directed to a gas particulate treatment system and may include a gas filter and a gas filter performance monitor downstream of the gas filter. The gas filter performance monitor includes a particulate trap operable to collect particulates passing through the gas filter, and a sensing apparatus associated with the gas filter performance monitor that operates to sense particulate collection in the gas filter performance monitor. | 07-22-2010 |
20100192544 | EXHAUST GAS PURIFICATION APPARATUS IN AN INTERNAL COMBUSTION ENGINE - An apparatus that raises temperature of a post-catalyst at an early time while suppressing reducing agent poisoning of the post-catalyst and discharge of a reducing agent into the outside when a pre-catalyst and the post-catalyst are arranged in series in an exhaust passage of an internal combustion engine in order from an upstream side thereof. The pre-catalyst is arranged to allow an exhaust gas to flow between an outer peripheral surface thereof and an inner peripheral surface of the exhaust passage. A reducing agent addition valve adding a reducing agent to allow the reducing agent to pass through the pre-catalyst is arranged immediately upstream of the pre-catalyst in the exhaust passage. Further, a retention catalyst is arranged in the exhaust passage between the pre-catalyst and the post-catalyst, to temporarily retain the reducing agent in the exhaust gas. | 08-05-2010 |
20100199637 | ROTATIONAL GENERATION TYPE WIRELESS OXYGEN SENSOR - An oxygen sensor for a motor vehicle having an electrode within an outer shell measures oxygen in exhaust gas exiting the vehicle and generates a signal based on the oxygen measurement. A communication device, powered by a battery or capacitor, wirelessly transmits the measured amount of oxygen from the electrode to a powertrain control module. The flow of exhaust gas through the exhaust system spins blades to spin a generator in a rotational power generation device to generate electrical current to be stored and used by the battery or capacitor. The rotational power generation device may be located in the exhaust pipe, such as through an exhaust pipe wall, and either be connected to the oxygen sensor shell or separate and connected only with electrical wires between the generator and the battery or capacitor. | 08-12-2010 |
20100199638 | APPARATUS FOR DIAGNOSING DETERIORATION OF NOX ABSORPTION-REDUCTION CATALYST - An apparatus for diagnosing deterioration of a NOx absorption-reduction catalyst provided at an exhaust path of an engine includes a sensor disposed upstream of the catalyst to sense a NOx concentration in emission gas, a calculating unit calculating a first ratio of emission of NOx to inflow of NOx or a second ratio of absorption of NOx to inflow of NOx, and a diagnosing unit which diagnoses deterioration of the catalyst using the first or second ratio as an indicator. The calculating unit calculates inflow of NOx based on an output of the sensor and either the flow volume of the emission gas or a correlation value of the flow volume of the emission gas, calculates the absorption of NOx based on the amount of rich components required for reducing the NOx, and calculates the emission of NOx based on the difference between the inflow and absorption of NOx. | 08-12-2010 |
20100205941 | EXHAUST GAS RECIRCULATION DEVICE OF INTERNAL COMBUSTION ENGINE - An exhaust gas recirculation device ( | 08-19-2010 |
20100223910 | ENVIRONMENTAL FACTOR BASED PARTICULATE FILTER REGENERATION - A control module for a vehicle includes a correction module that generates a correction signal based on a regeneration state of an exhaust system of the vehicle and based on a received environmental signal. The environmental signal includes at least one of an altitude value, an ambient temperature, and an air flow value. The air flow value corresponds to air flow across an external area of the exhaust system. A first post injection module generates a first post injection signal. A second post injection module adjusts the first post injection signal based on the correction signal to generate a second post injection signal. | 09-09-2010 |
20100236222 | PARTICULATE FILTER REGENERATION POST-INJECTION FUEL RATE CONTROL - A control system for a vehicle includes a mode determination module that selects one of a first post-injection mode and a second post-injection mode based on a regeneration enable signal and a particulate filter temperature signal. An adjustment module selects one of N ramp rate tables based on the selected one of the first post-injection mode and the second post-injection mode. N is an integer greater than 1. The adjustment module generates a post-injected fuel signal based on the selected one of the N ramp rate tables, an ambient temperature signal and the particulate filter temperature signal. The adjustment module outputs the post-injected fuel signal to a fuel injection system. | 09-23-2010 |
20100242441 | DEVICES FOR DETECTING ACCUMULATION AMOUNT OF PARTICULATES - It is provided a device for detecting an accumulation amount of particulates. The device has a filter for trapping particulates from a gas containing the particulates, a container | 09-30-2010 |
20100242442 | DEVICES FOR DETECTING ACCUMULATION AMOUNT OF PARTICULATES - A device for detecting particulates includes: a filter; a filter container; an upstream pipe; a downstream pipe; an upstream detecting unit; and a downstream detecting unit. The upstream detecting unit has a branch flow route for receiving gas from the upstream pipe, a trapping portion, a transmitting portion for transmitting an electromagnetic wave to the trapping portion, and a receiving portion for receiving an electromagnetic wave from the trapping portion. The downstream detecting unit has a branch flow route for receiving gas from the downstream pipe, a trapping portion, a transmitting portion for transmitting an electromagnetic wave to the trapping portion, and a receiving portion for receiving an electromagnetic wave from the trapping portion. The amount of the particulates trapped in the filter is detected based on a difference between detection values of the mass of the particulates trapped in the upstream and downstream trapping portions. | 09-30-2010 |
20100242443 | EXHAUST AFTERTREATMENT DEVICE - When an estimated value (A value) of an accumulation amount in a filter for trapping particulate matter reaches a prescribed value A | 09-30-2010 |
20100251697 | EXHAUST GAS PURIFICATION SYSTEM FOR INTERNAL COMBUSTION ENGINE - An object of the present invention is to provide a technology that enables reduction of NOx stored in an NOx catalyst with improved efficiency in an exhaust gas purification system for an internal combustion engine. According to the present invention, when NOx stored in the NOx catalyst is to be reduced, if the temperature of the NOx catalyst is lower than a specific temperature, the air-fuel ratio of the ambient atmosphere around the NOx catalyst is decreased only by decreasing the air-fuel ratio of the exhaust gas discharged from the internal combustion engine, and if the temperature of the NOx catalyst is not lower than the specific temperature, the air-fuel ratio of the ambient atmosphere around the NOx catalyst is decreased either only by adding reducing agent through reducing agent addition means, or by decreasing the air-fuel ratio of the exhaust gas discharged from the internal combustion engine and adding reducing agent through the reducing agent addition means. | 10-07-2010 |
20100257844 | EXHAUST GAS PURIFYING DEVICE FOR INTERNAL COMBUSTION ENGINE - An exhaust gas purifying system for a diesel engine has an ECU, a passage of exhaust gas, a unit having SCR catalyst, a NOx sensor placed at a downstream side of the unit, and a urea water adding valve placed at an upstream side of the unit. The SCR catalyst in the unit selectively adsorbs ammonia, and selectively purifies NOx contained in an exhaust gas emitted from the diesel engine by the adsorbed ammonia. The ECU changes the urea water adding amount, and performs abnormality diagnosis based on the detection result of the NOx sensor while changing an adding amount of the urea water. The ECU uses a first condition to indicate the presence of an excess NOx amount in the exhaust gas, and a second condition to indicate there is no error cause by the ammonia adsorption on the SCR catalyst. | 10-14-2010 |
20100263355 | METHOD AND DEVICE FOR DIAGNOSING A PARTICLE FILTER - A method for diagnosing a particle filter arranged in the waste gas line of an internal combustion engine has the steps of: executing at least one fuel injection, measuring HC emission in the waste gas line in the direction of flow of the waste gas behind the particle filter, and diagnosing a defect of the particle filter based on the measured HC emission. | 10-21-2010 |
20100307135 | APPARATUS AND METHOD FOR DIAGNOSING CATALYST DETERIORATION - A catalyst deterioration diagnosing apparatus is provided with means for performing stoichiometric feedback control on the air-fuel ratio based on at least output from an upstream air-fuel ratio sensor provided upstream of a catalyst, means for measuring the oxygen storage capacity of the catalyst, and means for correcting the measured value of the oxygen storage capacity based on at least the output behavior of a downstream air-fuel ratio sensor provided downstream of the catalyst during the stoichiometric feedback control. The measured value of the oxygen storage capacity is corrected using the output behavior of the downstream air-fuel ratio sensor during stoichiometric feedback control. The diagnostic is performed after eliminating the effects from sulfur by correcting the measured value to a value corresponding to when low sulfur fuel is used, which makes it possible to prevent an erroneous diagnosis from being made. | 12-09-2010 |
20100307136 | Method For Determining The Instant At Which A Nitrogen Oxide Storage Catalyst Is Switched From The Storage Phase To The Regeneration Phase And For Diagnosing The Storage Properties Of This Catalyst - When a nitrogen oxide storage catalyst is being regenerated, the regeneration may be terminated for example as a result of a premature load change in the engine, which can lead to incomplete emptying of the storage catalyst. The residual filling level which remains in the catalyst following an incomplete regeneration of this nature is used as the starting value for calculation of the filling level during the next storage phase. After incomplete regeneration, the nitrogen oxide conversion rate is initially greater than would be expected, on account of the residual filling level. By taking this increased conversion rate into account when calculating the filling level during the storage phase, it is possible to further improve the accuracy of the calculation. | 12-09-2010 |
20100319318 | DEGRADATION DIAGNOSIS DEVICE FOR CATALYST - A temperature increasing degree of the catalytic outflow exhaust temperature at the time the exhaust air-fuel ratio is changed to the rich side is found in respect to each of a plurality of the catalytic inflow exhaust temperatures. A grade (S) of the temperature increasing degree is found based upon the inflow exhaust temperature and the temperature increasing degree to determine degradation of the catalyst based upon at least one of a maximum value (Smax) of the grade and the inflow exhaust temperature (Tinmax) corresponding to the maximum value. An accurate catalyst degradation diagnosis can be carried out since not only the temperature increasing degree but also the inflow exhaust temperature are taken into account. | 12-23-2010 |
20100319319 | DPF ACCUMULATION AMOUNT ESTIMATING APPARATUS - A DPF accumulation amount estimating apparatus uses an integrated PM accumulation amount estimation logic which combines the difference between an engine PM emission amount and a PM regeneration amount and a DPF differential pressure model, thereby achieving minimized influences of changes in an exhaust gas flow rate and the like with resultant improved estimation accuracy. The DPF accumulation amount estimating apparatus for estimating the accumulation amount in a DPF (diesel particulate filter) provided therewith for removing PM (particulates (particulate matters)) in an exhaust gas, and includes a PM emission amount model in which a PM emission amount is set on the basis of the operating condition of an engine, a PM regeneration amount model in which a PM regeneration amount is set on the basis of the temperature difference between an outlet temperature and an inlet temperature of the DPF, and a DPF differential pressure model in which a PM accumulation amount is set on the basis of the differential pressure between an exhaust gas flow rate and the DPF, wherein the estimated PM accumulation amount of the DPF is calculated by adding a corrected PM accumulation amount obtained by correcting the estimated value of the DPF differential pressure model by using a coefficient K, which is determined on the basis of an engine speed and the fuel injection amount of an engine, to a difference between a PM emission amount and a PM regeneration amount. | 12-23-2010 |
20110000193 | SYSTEM AND METHOD FOR DETECTING DIESEL PARTICULATE FILTER CONDITIONS BASED ON THERMAL RESPONSE THEREOF - Systems and methods to determine conditions of a diesel particulate filter (DPF) based on correlation between predicted and actual thermal data of the fluid exiting a DPF are provided. Soot loading, ash loading, and/or DPF damage may be detected, and DPF operational models may be calibrated in accordance with such systems and methods. Further, initiation of regeneration may also be effected in accordance with such systems and methods. | 01-06-2011 |
20110005205 | PARTICULATE MATTER REDUCTION APPARATUS FOR DIESEL ENGINE - A particulate matter reduction apparatus for a diesel engine, which can reduce particulate matter in a convenient manner with a relatively simple structure, while preventing the shortening of the lifespan of a filter and improving particulate matter burning efficiency, is provided. The particulate matter reduction apparatus includes a housing configured to be placed on a flow path into which exhaust gas is discharged from the diesel engine, a filter configured to collect particulate matter contained in the exhaust gas that flows in the housing, electrodes configured to transmit electronic signals to the filter, and a control unit configured to control the electric signals provided to the electrodes. The particulate matter reduction apparatus is advantageous in that particulate matter is burnt and removed by directly heating the filter. In addition, the apparatus is more convenient, compared to a system which requires a filter to be separated and cleaned. In addition, the particulate matter reduction apparatus has a more simplified structure, compared to a system that heats a filter using an electric heater or a is diesel burner. Accordingly, the manufacturing cost can be reduced. Furthermore, the particulate matter reduction apparatus is advantageous in that the filter is relatively uniformly heated rather than being partially heated, so that a long lifespan of the filter can be assured. | 01-13-2011 |
20110030348 | SYSTEM AND METHODS FOR CONTROLLING SELECTIVE CATALYTIC REDUCTION SYSTEMS - An engine system includes an aging factor generation module, a temperature comparison module, and a mode control module. The aging factor generation module generates an aging factor that indicates deterioration of a catalyst in a selective catalytic reduction (SCR) system. The temperature comparison module compares inlet and outlet temperatures of the SCR system to predetermined effective inlet and outlet temperatures of the SCR system, respectively, wherein the predetermined effective inlet and outlet temperatures are based on the aging factor. The mode control module controls at least one of a throttle and a plurality of fuel injectors based on a first predetermined air/fuel (A/F) ratio when the inlet and outlet temperatures of the SCR system are greater than the predetermined effective inlet and outlet temperatures of the SCR system, respectively. | 02-10-2011 |
20110047978 | METHOD FOR EVALUATING DEGRADATION OF A PARTICULATE MATTER SENSOR - A system for improving operation of an engine having a particulate matter sensor is presented. The system may be used to improve engine operation during cold starts especially under conditions where water vapor or entrained water droplets are present in vehicle exhaust gases. In one embodiment, degradation of a particulate matter sensor is indicated after a temperature of a substrate of the particulate matter sensor exceeds a threshold temperature and an output of the particulate matter sensor is below a threshold value. | 03-03-2011 |
20110047979 | FUEL-FIRED COMBUSTOR - A fuel-fired combustor includes a housing with a combustion chamber. The housing has an inlet and an outlet. A fuel inlet to the housing supplies fuel to the combustion chamber. An igniter ignites a mixture of exhaust gas and fuel to produce a flame for increasing an internal temperature. At least one sensor measures or monitors at least one combustor characteristic and generates a corresponding combustor characteristic signal. A controller receives the combustor characteristic signal, compares the combustor characteristic signal to a predetermined combustor criteria and generates an output signal to change at least one combustor operating condition if the combustor characteristic signal varies from the predetermined combustor criteria. | 03-03-2011 |
20110061367 | EXHAUST SYSTEM FOR INTERNAL COMBUSTION ENGINE - The present invention discloses an exhaust system for an internal combustion engine that provides diesel particulate filter (DPF) failure detection and/or monitoring of nonmethane hydrocarbons (NMHC) for an internal combustion engine. The system can include a main exhaust duct and a secondary exhaust line operative for exhaust gas to pass therethrough. The system has an oxidation catalyst and a main particulate filter located in line with the main exhaust duct. A monitoring particulate filter is also included and located within the secondary exhaust line. The secondary exhaust line and the monitoring particulate filter are located downstream from the main particulate filter. | 03-17-2011 |
20110061368 | PARTICULATE MATTER SENSOR AND EXHAUST GAS PURIFYING APPARATUS - A particulate matter sensor includes a detection filter, a differential pressure detecting unit, an on-off valve, and a valve control unit. The detection filter is installed in an exhaust passage connected to an internal combustion engine and is configured to detect particulate matter contained in an exhaust gas passing through the exhaust passage. The differential pressure detecting unit is configured to detect a pressure difference between an upstream side and a downstream side of the detection filter. The on-off valve is installed on the upstream side of the detection filter in the exhaust passage and is configured to control a flow of the exhaust gas toward the detection filter. The valve control unit is configured to control the on-off valve to be opened and closed. | 03-17-2011 |
20110072790 | METHOD AND APPARATUS FOR MONITORING A HYDROCARBON-SELECTIVE CATALYTIC REDUCTION DEVICE - A method for monitoring a hydrocarbon-selective catalytic reactor device of an exhaust aftertreatment system of an internal combustion engine operating lean of stoichiometry includes injecting a reductant into an exhaust gas feedstream upstream of the hydrocarbon-selective catalytic reactor device at a predetermined mass flowrate of the reductant, and determining a space velocity associated with a predetermined forward portion of the hydrocarbon-selective catalytic reactor device. When the space velocity exceeds a predetermined threshold space velocity, a temperature differential across the predetermined forward portion of the hydrocarbon-selective catalytic reactor device is determined, and a threshold temperature as a function of the space velocity and the mass flowrate of the reductant is determined. If the temperature differential across the predetermined forward portion of the hydrocarbon-selective catalytic reactor device is below the threshold temperature, operation of the engine is controlled to regenerate the hydrocarbon-selective catalytic reactor device. | 03-31-2011 |
20110083424 | METHOD AND APPARATUS FOR MONITORING A REDUCTANT INJECTION SYSTEM IN AN EXHAUST AFTERTREATMENT SYSTEM - An internal combustion engine operating at a lean air/fuel ratio includes a reductant injection system configured to dispense reductant into an exhaust gas feedstream upstream of a selective catalytic reduction device. The reductant injection system includes a reductant delivery system fluidly coupled to a reductant dispensing device that is configured to dispense the reductant. A method for monitoring the reductant injection system includes commanding the reductant dispensing device to dispense reductant at a prescribed reductant flowrate, controlling the reductant delivery system to a preferred operating state, monitoring operation of the reductant delivery system and estimating a reductant flowrate as a function of the monitored operation of the reductant delivery system, and diagnosing operation of the reductant injection system as a function of the prescribed reductant flowrate and the estimated reductant flowrate. | 04-14-2011 |
20110083425 | INTEGRATED FUEL CATALYST MONITOR - A method is provided for monitoring an emission device coupled to an engine. In one example approach, the method comprises: following a deceleration fuel shut-off duration, indicating degradation of the emission device based on an amount of rich products required to cause a sensor to become richer than a threshold. The amount of rich products required may be correlated to an amount of oxygen stored in the emission device. The indication of emission device degradation may be further based on air mass and temperature during delivery of the required rich products. | 04-14-2011 |
20110099982 | UNINTENDED EXOTHERMAL REACTIONS MONITORING FOR DIESEL AFTER-TREATMENT SYSTEMS - An algorithm or diagnostic for detecting and alarming unintended exothermic conditions in exhaust after treatment components selectively detects alarming temperature variations in exhaust after treatment components when caused by internal unintended exothermal events, rather than transient conditions that are externally driven. Not only are the output temperature and the delta temperature (T_out−T_in) across the component monitored in each after-treatment device, but also the input temperature is deeply analyzed through its recent history data in order to determine if any input variations caused the output changes. | 05-05-2011 |
20110099983 | Reducing agent injection valve abnormality detection device and abnormality detection method, and internal combustion engine exhaust gas purification system - A reducing agent injection device is equipped with a storage tank that houses a reducing agent, a pump that pressure-feeds the reducing agent, a reducing agent injection valve that injects the reducing agent pressure-fed by the pump into the inside of an exhaust pipe of an internal combustion engine, a supply path that interconnects the pump and the reducing agent injection valve, and a pressure sensor that is disposed in the supply path. The reducing agent injection device is configured such that it can suck, into the inside of the supply path, a gas inside the exhaust pipe via an injection hole in the reducing agent injection valve by subjecting the inside of the supply path to depressurization processing. An abnormality detection device detects clogging of the reducing agent injection valve in the reducing agent injection device and includes a clogging determination component. The clogging determination component uses a pressure value detected by the pressure sensor after the start of the depressurization processing to determine whether or not clogging is occurring in the reducing agent injection valve. | 05-05-2011 |
20110107742 | Reducing agent injection valve abnormality detection device and abnormality detection method - A reducing agent injection valve abnormality detection device for detecting clogging of a reducing agent injection valve in a reducing agent injection device has a pressure detection component that detects the pressure inside a supply path based on a sensor value of a pressure sensor, a pump control component that fixes the output of a pump in a state where the pressure inside the supply path has become a value in a predetermined range, a reducing agent injection valve control component that opens the valve for a predetermined amount of time in a state where the output of the pump has been fixed, and a clogging determination component that determines the extent of clogging of the reducing agent injection valve by comparing, with plural threshold values, the pressure, or a pressure drop quantity, inside the supply path when the valve has been opened for the predetermined amount of time. | 05-12-2011 |
20110131955 | Deterioration Rate Determination Method of Lambda Sensor and System Thereof - A degradation rate decision method of a lambda sensor, may include an injection step injecting a reducing agent so as to regenerate a nitrogen oxide purification catalyst, a lambda value detection step detecting a lambda value of the lambda sensor from a fuel/air ratio of exhaust gas after injecting the reducing agent, a reaching time decision step determining a time period that the lambda value takes to reach a predetermined criterion value after injecting the reducing agent, and a degradation rate decision step determining that the lambda sensor is degraded when the time period is equal to or longer than a predetermined time period. | 06-09-2011 |
20110131956 | CATALYST DEGRADATION DETERMINATION DEVICE FOR EXHAUST PURIFICATION SYSTEM - A catalyst degradation determination device is provided that can determine the degradation of a selective reduction catalyst with high precision while also suppressing a temporary decline in purification performance. By way of controlling a urea injection device, the catalyst degradation determination device increases, in a selective reduction catalyst in a state in which the storage amount is a maximum, the storage amount thereof by a detection reduced-amount portion DST | 06-09-2011 |
20110146242 | MALFUNCTION DIAGNOSTIC DEVICE FOR EXHAUST GAS CONTROL DEVICE - A malfunction diagnostic device for an exhaust gas control device is provided. The malfunction diagnostic device includes a malfunction determination unit that determines an exhaust gas control device provided in an exhaust system of an internal combustion engine malfunctions when a parameter that indicates exhaust gas purification performance of the exhaust gas control device crosses a threshold. A deterioration determination unit determines the degree of deterioration of the exhaust gas control device. A variable threshold setting unit variably sets the threshold based on the degree of deterioration of the exhaust gas control device in such a manner that the likelihood that the exhaust gas control device is determined to be malfunctioning is lower at lower degrees of deterioration of the exhaust gas control device. | 06-23-2011 |
20110173955 | METHOD AND APPARATUS FOR MONITORING A PARTICULATE FILTER - A method to monitor a particulate filter includes determining an equivalent bypass area corresponding to a difference between a mass flowrate of an exhaust gas feedstream flowing to the particulate filter and a mass flowrate of the exhaust gas feedstream flowing through porous walls of a substrate. | 07-21-2011 |
20110225954 | SENSOR FOR EXHAUST GAS PURIFYING APPARATUS - A sensor for an exhaust gas purifying apparatus includes an examining filter and a holding member. The examining filter is provided in a secondary exhaust line diverging from a primary exhaust line of an internal combustion engine. The holding member holds the examining filter on the secondary exhaust line. The holding member holds an approximately 10% to approximately 50% part by area of a peripheral portion of the examining filter so as to cover the part from a peripheral side of the examining filter. | 09-22-2011 |
20120000187 | PARTICULATE FILTER REGENERATION INTERRUPTION SYSTEMS AND METHODS - A regeneration control system for a vehicle includes a regeneration control module and a regeneration interrupt module. The regeneration control module selectively provides fuel to an oxidation catalyst for a regeneration event of a particulate filter that occurs during a predetermined melting period for frozen dosing agent. The regeneration interrupt module selectively interrupts the regeneration event and disables the provision of fuel to the oxidation catalyst before the regeneration event is complete when a temperature of a dosing agent injector that is located between the oxidation catalyst and the particulate filter is greater than a predetermined temperature. | 01-05-2012 |
20120006008 | OPTIMIZATION OF ACTIVE REGENERATION TRIGGERS BASED ON AMBIENT AND VEHICLE OPERATING CONDITIONS - A method of controlling the regeneration of a particulate filter includes defining a regeneration trigger limit for at least one operating parameter of the vehicle, modifying the regeneration trigger limit based upon a sensed ambient operating condition and a sensed vehicle operating condition to define a modified regeneration trigger limit, and regenerating the particulate filter when the modified regeneration trigger limit for the operating parameter is reached. | 01-12-2012 |
20120006009 | Exhaust Purification Device For Internal Combustion Engine - Provided is an exhaust purification device for an internal combustion engine, wherein the operation of an internal combustion engine can be prevented from being maintained when a particulate filter is melted. An exhaust purification device ( | 01-12-2012 |
20120011830 | METHOD FOR HEATING SOLID AMMONIA TO RELEASE GASEOUS AMMONIA IN EXHAUST AFTERTREATMENT SYSTEM - A method for heating solid ammonia (NH | 01-19-2012 |
20120017570 | Ash Detection In Diesel Particulate Filter - Detecting ash in a diesel particulate filter includes receiving data indicative of signal attenuation for ash-responsive and ash-insensitive RF signals transmitted through a diesel particulate filter containing trapped soot and ash. A difference between the RF signals, such as a difference in signal attenuation, may be leveraged to detect a relative ash loading state or a change in relative ash loading state of the diesel particulate filter, and responsively indicate that filter cleaning is needed. | 01-26-2012 |
20120023911 | DETECTION OF EXHAUST PARTICULATE FILTER SUBSTRATE FAILURE - A method of detecting failure of a substrate in a particulate filter includes comparing an absolute value of a difference between a theoretical temperature difference and an actual temperature difference between an upstream end and a downstream end of the particulate filter to a temperature differential threshold, and comparing an absolute value of a difference between a theoretical pressure difference and an actual pressure difference between the upstream end and the downstream end of the particulate filter to a pressure differential threshold. Failure of the substrate is indicated by one or both of the temperature difference and the pressure difference being greater than the temperature differential threshold and the pressure differential threshold respectively. | 02-02-2012 |
20120023912 | CONTAMINATION DETECTION IN FUEL SYSTEM - A system comprises a fuel system for delivering fuel to an engine for combustion and a reductant storage system for delivering reductant to the exhaust stream for an SCR catalyst for NOx reduction. The fuel system further comprises a water separator for separating water-based fluid from fuel in the fuel tank, and a separation reservoir to collect the separated water-based fluid. Based on readings of a water-in-fuel sensor positioned within the reservoir, a type of degradation (e.g., water build-up, high-water-content fuel, mis-filling of the reductant, etc.) may be determined and indicated. | 02-02-2012 |
20120031078 | SENSOR CONTROLLER - A sensor controller for a particulate matter detection sensor includes a signal output circuit connected to the particulate matter detection sensor such that a sensor detection value is changeable in a predetermined output range by the signal output circuit, a heater configured to heat an attachment portion so as to burn and remove particulate matter attached to the attachment portion, a learning portion for calculating a sensor standard value in a state where the resistance between a pair of opposed electrodes is reduced based on an obtained sensor detection value and for storing the sensor standard value as a learning value, and a correcting portion for correcting the sensor detection value based on the sensor standard value stored by the learning portion. | 02-09-2012 |
20120067031 | METHOD AND APPARATUS FOR MONITORING A REDUCTANT INJECTION SYSTEM IN AN EXHAUST AFTERTREATMENT SYSTEM - A reductant injector is configured to dispense a reductant into an exhaust gas feedstream of an internal combustion engine upstream of a selective catalytic reduction device. The reductant injector of a reductant injection system is monitored by generating injector pulsewidth commands corresponding to a prescribed reductant flowrate, monitoring the injector pulsewidth commands, verifying the prescribed reductant flowrate corresponds to the injector pulsewidth commands, monitoring a fluidic pressure in the reductant injection system, estimating a first injected quantity of the reductant corresponding to the injector pulsewidth commands, estimating a second injected quantity of the reductant corresponding to the fluidic pressure in the reductant injection system, and comparing the first and second injected quantities of reductant. | 03-22-2012 |
20120073268 | FUEL-FIRED BURNER FOR NO2 BASED REGENERATION - A fuel-fired burner in a vehicle exhaust system is selectively activated to increase exhaust gas temperature to a desired reference temperature. The fuel-fired burner can be either a partial range burner or a full range burner. A control strategy activates the fuel-fired burner only when needed to provide NO | 03-29-2012 |
20120090301 | SYSTEM, METHOD, AND APPARATUS FOR ENHANCING AFTERTREATMENT REGENERATION IN A HYBRID POWER SYSTEM - A method includes providing an internal combustion engine having an output shaft and producing an exhaust gas stream, providing an electric motor operatively coupled to the output shaft, and determining a regeneration state of an aftertreatment component that treats the exhaust gas stream. The method further includes determining an engine torque requirement such that, when the internal combustion engine achieves the engine torque requirement at a present set of operating conditions, a temperature of the exhaust gas stream will achieve an exhaust gas temperature threshold. The method further includes commanding the electric motor to apply a counter torque to the output shaft in response to the regeneration state indicating an active thermal regeneration event, where the counter torque comprises is high enough for the internal combustion engine to achieve the engine torque requirement. The exhaust gas temperature threshold may be a hold-warm temperature and/or a regeneration temperature. | 04-19-2012 |
20120110983 | DIESEL EXHAUST TREATMENT APPARATUS - Apparatus for attenuating particulate matter and volatile organic compounds in exhaust gases of diesel engines. The apparatus includes a housing disposed serially relative to exhaust gas flow. The housing encloses mechanical filters having gas orifices of different sizes, and after the filters, a low temperature, low restriction catalytic converter. Pressure may be monitored to infer clogging by particulates. Clogging may be annunciated by an indicating light. Individual filters may be contained within plural separate filter canisters, which may be removed for cleaning. The housing may be substantially of aluminum, having cooling fins and a longitudinally oriented mounting foot. Filters may be arranged such that their orifices are misaligned to promote separation of particulates from the exhaust gases. | 05-10-2012 |
20120167557 | EXHAUST GAS PURIFICATION APPARATUS FOR AN INTERNAL COMBUSTION ENGINE - A liquid additive agent added into an exhaust gas is suppressed from adhering to a sensor. Provision is made for a sensor that is arranged in an exhaust passage of an internal combustion engine; an addition valve that is arranged in the vicinity of or at the downstream side of the sensor in the direction of flow of the exhaust gas, and adds an additive agent into the exhaust passage; a catalyst that is arranged at the downstream side of the addition valve, and receives a supply of the additive agent from the addition valve; and pressure difference generation unit that makes a pressure of the exhaust gas in the surrounding of the sensor higher than a pressure thereof in the surrounding of the addition valve. A pressure difference is caused to generate so that the additive agent is suppressed from flowing toward the direction of the sensor. | 07-05-2012 |
20120180458 | ABNORMALITY DETECTION APPARATUS FOR PARTICULATE FILTER - An abnormality detection apparatus for a particulate filter that is provided in an exhaust system of an internal combustion engine and traps particulate matter in exhaust gas. The abnormality detection apparatus includes: a sensor that is provided downstream of the particulate filter and detects the particulate matter; a removal device that removes the particulate matter trapped in the particulate filter based on an output of the sensor; and a determination device that determines whether the particulate filter is in an abnormal state based on a first stabilization time that has elapsed until the output of the sensor becomes stable after completion of removal of the particulate matter performed by the removal device. | 07-19-2012 |
20120210700 | METHOD TO MONITOR PRESSURE DROP ACROSS A SELECTIVE CATALYST REDUCER FOR ENGINE AND EXHAUST AIRFLOW DIAGNOSTICS - A method to diagnose exhaust system malfunction in an electronically controlled internal combustion engine having an exhaust system and including a Selective Catalyst Reducer (SCR) is disclosed. The method may comprise determining ambient barometric pressure; determining a baseline curve of exhaust flow; and monitoring said exhaust flow rate for changes in exhaust flow rate compared to change of exhaust pressure across the SCR to diagnose exhaust system malfunction. | 08-23-2012 |
20120260637 | Hydraulic Driving Device for Working Machine - A hydraulic driving device for a working machine surely prevents behavior of a single rod double acting cylinder not intended by an operator when discharge pressure of a main pump is raised to raise exhaust gas temperature to temperature required for burning particulate matter. A selector valve | 10-18-2012 |
20130055700 | SELECTIVE CATALYTIC REDUCTION SYSTEM - A selective catalytic reduction system includes a urea aqueous solution tank to retain a urea aqueous solution to be injected into an exhaust pipe of an engine, a level sensor to detect a solution level height in the tank, a lowpass filter having a signal response characteristic in which a time constant is small when an engine rpm is low and the time constant is larger when the engine rpm is high, with respect to an output signal of the sensor, a remaining amount indicator to indicate a remaining amount of the solution based on an output signal of the sensor processed by the lowpass filter, and a unit to prohibit the engine from being started when the remaining amount of the solution is less than a lower limit value. | 03-07-2013 |
20130061574 | SCR THAWING CONTROL SYSTEM - A selective catalytic reduction thawing control system that can distinguish between a thawing failure and a malfunction and can prevent a malfunction of a supply module (“SM”) pump. The thawing control system includes a thawing control unit that detects a pressure inside the supply module when the SM pump is operated, and stops the operation of the SM pump and continues thawing of urea water when the pressure is less than a predetermined value. | 03-14-2013 |
20130067893 | METHOD AND DEVICE FOR DIAGNOSING AN ERROR IN AN EXHAUST GAS RECIRCULATION SYSTEM - In a method for determining a faulty exhaust gas recirculation line in an exhaust gas recirculation system of an internal combustion engine having multiple exhaust gas recirculation lines, a quantity of gas indicated by a specified exhaust gas recirculation rate is provided proportionately via the exhaust gas recirculation lines in accordance with an exhaust gas recirculation apportioning ratio, and the method further includes: testing in order to recognize an error in the exhaust gas recirculation system; when the error is recognized, performing a modification of the exhaust gas recirculation apportioning ratio and renewed testing of the exhaust gas recirculation system; and determination of the faulty exhaust gas recirculation line as a function of a result of the renewed testing. | 03-21-2013 |
20130086890 | EXHAUST GAS PURIFICATION SYSTEM - An exhaust gas purification system is provided with an exhaust gas purification device which is arranged in an exhaust gas route of a common rail type engine, and is structured such that a plurality of renewing modes which burn and remove a particulate matter deposited within the exhaust gas purification device is executed. One of the plurality of renewing modes is an initialization renewing (a forced renewing) mode which supplies a fuel into the exhaust gas purification device by a post injection regardless of a clogged state of the exhaust gas purification device, in the case that an accumulated drive time of the engine becomes equal to or more than a previously set time. | 04-11-2013 |
20130139490 | SYSTEM AND METHOD FOR DETERMINING AN EXHAUST SYSTEM CONDITION - In one embodiment of the invention, a method for determining an exhaust system condition includes determining if a reaction in an oxidation catalyst is performing acceptably based on a determined temperature of the exhaust gas flowing from the oxidation catalyst and determining a temperature of the exhaust gas flowing from a particulate filter. The method further includes determining a temperature of the exhaust gas flowing into the oxidation catalyst, determining an exhaust system condition based on a first difference between the temperature of the exhaust gas flowing from the particulate filter and the temperature of the exhaust gas flowing from the oxidation catalyst and a second absolute difference between the temperature of the exhaust gas flowing from the oxidation catalyst and the temperature of the exhaust gas flowing into the oxidation catalyst and communicating a signal to identify the determined exhaust system condition. | 06-06-2013 |
20130186073 | RECOVERY CONTROL SYSTEM - A recovery control system that allows a dosing valve to recover from a malfunction to a normal state, or a liquid feed line through which urea solution is fed to recover from clogging to a normal state. An abnormality detector detects an abnormality of the dosing valve and a recovery controller controls a supply module to feed urea solution in the dosing valve back to an urea tank when the abnormality detector detects the abnormality. | 07-25-2013 |
20130213014 | REDUCING AGENT INJECTION VALVE ABNORMALITY DETECTION UNIT AND REDUCING AGENT SUPPLY APPARATUS - [Problem] To provide a reducing agent injection valve abnormality detection unit capable of precisely determining whether or not a reducing agent injection valve is abnormally stuck, and a reducing agent supply apparatus. | 08-22-2013 |
20130239553 | SYSTEM FOR DETERMINING SULFUR STORAGE OF AFTERTREATMENT DEVICES - An exhaust gas treatment system for an internal combustion engine for determining a total amount of sulfur that is stored on at least one aftertreatment device is provided. The exhaust gas treatment system includes a control module that monitors operation of the internal combustion engine for an amount of fuel consumed and an amount of oil consumed by the internal combustion engine. The control module includes a sulfur adsorption module and a total sulfur storage module. The sulfur adsorption module determines a rate of sulfur adsorption in at least one aftertreatment device. The rate of sulfur adsorption is based on the amount of fuel consumed and the amount of oil consumed. The total sulfur storage module is in communication with the sulfur adsorption module. The total sulfur storage module determines the total amount of sulfur stored based on the rate of sulfur adsorption. | 09-19-2013 |
20130318948 | SOOT SENSOR FUNCTIONAL CAPABILITY MONITORING - A method of monitoring functional capability of a soot sensor that is responsive to deposition of soot from an exhaust gas stream on a sensor surface comprises acquiring a measurement signal of the soot sensor and running a plausibility check, in which it is ascertained whether the measurement signal agrees with an expected finding. According to the invention it is detected whether conditions are present, on which liquid, e.g. water, from the exhaust gas stream condensates on the sensor surface. Additionally or alternatively, such conditions are produced. The plausibility check then includes ascertaining whether the measurement signal reflects the condensation of liquid. The detection of presence of conditions for condensation comprises a measurement or an estimation of temperature on the sensor surface. | 12-05-2013 |
20140007561 | CATALYTIC CONVERTER WARM-UP CONTROL APPARATUS FOR HYBRID VEHICLE - A catalytic converter warm-up control apparatus for a hybrid vehicle includes a catalytic converter warm-up controller, a temperature parameter acquisition device, a warm-up control parameter setting device, and a motoring execution device. The catalytic converter warm-up controller is configured to execute warm-up control to warm up a catalytic converter of the hybrid vehicle for activating the catalytic converter upon start-up of an internal combustion engine provided in the hybrid vehicle. The warm-up control parameter setting device is configured to set warm-up control parameters used in the warm-up control in accordance with the temperature parameter acquired by the temperature parameter acquisition device. The motoring execution device is configured to execute motoring of the internal combustion engine by a first electric motor in a predetermined operation state. The catalytic converter warm-up controller is configured to execute the warm-up control in accordance with an execution state of the motoring. | 01-09-2014 |
20140020367 | VEHICLE HAVING SYSTEM AND METHOD OF DIAGNOSING SECONDARY AIR INJECTION APPARATUS - A system and a method of diagnosing a secondary air injection apparatus may include an intake line supplying air to an engine, an exhaust line exhausting exhaust gas, a secondary air injection (SAI) line branching off at a branch point of the intake line and being joined to the exhaust line at a joining point of the exhaust line, a first pressure sensor mounted at the intake line to detect pressure or amount of intake air flowing through the intake line, a catalytic converter, a first oxygen sensor mounted at the exhaust line, an SAI pump mounted at the SAI line and pumping the air flowing through the intake line to the SAI line, an SAI valve mounted at the SAI line and selectively communicating the SAI line with the exhaust line, and a control portion controlling the SAI pump and the SAI valve to perform catalyst heating. | 01-23-2014 |
20140060012 | DETERIORATION DIAGNOSIS DEVICE FOR OXIDATION CATALYST - A deterioration diagnosis device for an oxidation catalyst includes: a multi-gas sensor disposed in an exhaust passage downstream of an oxidation catalyst, the multi-gas sensor including a NO | 03-06-2014 |
20140331649 | CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE AND METHOD OF CONTROLLING THE SAME - In an internal combustion engine that is capable of performing a fuel supply cut control (FC control), a performance of the FC control is suspended, in a case where, when the performance of the FC control is requested to initiate, a deviation between a solid solution of an active element in a carrier and a target solid solution is equal to or more than a predetermined upper limit value and a catalyst temperature is equal to or more than a predetermined upper limit temperature. | 11-13-2014 |
20140331650 | Recirculating Exhaust Treatment Fluid System - An exhaust treatment fluid system includes a tank housing for storing an exhaust treatment fluid. A suction tube includes a first end positioned within the housing. A first sensor is positioned within the tank housing for determining at least one of a fluid level and a concentration of the exhaust treatment fluid. A skirt is positioned in the tank to peripherally surround the first sensor. | 11-13-2014 |
20140366511 | CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE - A control device for an internal combustion engine includes a SCR system disposed in an exhaust passage and a particulate matter sensor disposed downstream of the SCR system. The control device applies a particulate matter trapping voltage to the particulate matter sensor, and acquires an output of the particulate matter sensor at a first timing after the start of application of the particulate matter trapping voltage. The control device executes predetermined control in accordance with the output. If a second timing at which an integrated operating time period of the internal combustion engine in a predetermined operating state in which urea-related substances discharged to downstream of the SCR system increase reaches a reference time period after starting application of the particulate matter trapping voltage is earlier than the first timing, the control device stops the predetermined control. | 12-18-2014 |
20150052878 | Multi-stage SCR System - A multi-stage SCR system including a front reductant injecting device, a front mixer, a front SCR catalyst, a back reductant injecting device, a back mixer, a back SCR catalyst, and a DCU. The front and back reductant injecting devices receives reductant from an air-driven pump, which includes a liquid supply tank, a pressure tank, and solenoids control valves. Under pressure provided by a compress air source, reductant is pressed into the front and back reductant injecting devices from the air-driven pump. The front and back reductant devices also have flow-back paths fluidly connected to a reductant tank. And in purging or maintenance heating, the flow-back paths can be energized open. In the multi-stage SCR system, a DOC can be further positioned in between the two SCR devices for increasing the deNOx efficiency in the back SCR catalyst, so that the system is less sensitive to catalyst aging. | 02-26-2015 |
20150089926 | EXHAUST GAS PURIFICATION SYSTEM - An exhaust gas purification system for an internal combustion engine includes: an addition valve disposed in an exhaust pipe of the internal combustion engine to add a reducing agent to exhaust gas; a temperature obtaining portion that acquires a temperature of the addition valve; a cooling portion that cools the addition valve by circulating cooling fluid; a determining portion that determines whether the cooling portion is able to normally cool the addition valve; and an output limit portion that limits output of the internal combustion engine based on a heat-resistant temperature of the addition valve and the temperature of the addition valve acquired by the temperature obtaining portion. | 04-02-2015 |
20150089927 | ABNORMALITY DIAGNOSIS SYSTEM OF INTERNAL COMBUSTION ENGINE - An internal combustion engine comprises an exhaust purification catalyst which can store oxygen, controller for controlling the air-fuel ratio of exhaust gas to become a target air-fuel ratio, and a downstream side air-fuel ratio sensor. An abnormality diagnosis system performs an active air-fuel ratio control which alternately controls the target air-fuel ratio to rich and lean air-fuel ratios, and diagnoses abnormality of said exhaust purification catalyst based on the output air-fuel ratio of the air-fuel ratio sensor. The abnormality diagnosis system judges that the exhaust purification catalyst is abnormal when the output air-fuel ratio of the air-fuel ratio sensor reaches a rich judgment air-fuel ratio and a lean judgment air-fuel ratio during the active air-fuel ratio control, and judges that said air-fuel ratio control is abnormal when the output air-fuel ratio reaches only one of the rich and lean judgment air-fuel ratios. | 04-02-2015 |
20150113960 | LEAK DETECTION AND MITIGATION IN REDUCTANT DELIVERY SYSTEMS - Solid storage media stores a reductant in a reductant source that is released from the solid storage media in a gaseous form into an exhaust system. A leak detection and/or leak mitigation system, method and apparatus is disclosed for the gaseous reductant. | 04-30-2015 |
20150361857 | UREA WATER SUPPLY SYSTEM - An object is to suppress the occurrence of a failure in supply of urea water as much as possible in suck-back control of urea water in a pump share-type urea water supply system with two supply valves. In the pump share-type urea water supply system with a first supply valve and a second supply valve, a urea water tank is connected with the respective supply valves by a urea water supply path. The urea water supply path includes a first supply path for the first supply valve and a second supply path for the second supply valve. The second supply path has a larger capacity than the capacity of the first supply path by a predetermined volume. The suck-back control of urea water controls opening and closing of the respective supply valves such that a first estimated valve-opening time that is a valve-opening time of the first supply valve estimated to be required for suck-back control in the first supply valve and in the first supply path is shorter than a second estimated valve-opening time that is a valve-opening time of the second supply valve estimated to be required for suck-back control in the second supply valve and in the second supply path by at least a first control time corresponding to the predetermined volume. | 12-17-2015 |
20150361858 | UREA WATER SUPPLY SYSTEM - An object is to suppress the occurrence of a failure in supply of urea water as much as possible in filling control of urea water in a pump share-type urea water supply system with two supply valves. In the pump share-type urea water supply system with a first supply valve and a second supply valve, a urea water tank is connected with the respective supply valves by a urea water supply path. The urea water supply path includes a first supply path for the first supply valve and a second supply path for the second supply valve. The second supply path has a larger capacity than the capacity of the first supply path by a predetermined volume. Filling control of urea water pressure-feeds urea water to the first supply valve and the first supply path by a pump operated in a specified operating state in a state that at least the first supply valve out of the first and second supply valves is opened, and closes the first supply valve based on a pressure value or a pressure variation per unit time obtained by an acquirer. | 12-17-2015 |
20160040580 | Reductant Tank Sensor Diagnostic Method and System - A system for diagnosing a sensor of an exhaust aftertreatment system may include receiving a first tank level value from a sensor. A plurality of reductant dosing command values over a period of time are received. A dosed reductant value is determined responsive to the plurality of reductant dosing command values reaching a threshold integrated value. A second tank level value is received from the sensor responsive to the dosed reductant value reaching the threshold integrated value. A sensor-estimated dosing value is determined based on the difference between the first tank level value and the second tank level value. The sensor may be diagnosed as performing outside of an acceptable calibration range based on the difference between the sensor-estimated dosing value and the dosed reductant value. | 02-11-2016 |
20160040581 | DIAGNOSING SYSTEM FOR REDUCTANT DOSING SYSTEM - An SCR system may include a controller configured to diagnose errors with a dosing system. The controller may control a pump to compensate for a loss in pressure when dosing reductant and may maintain the pressure as close to a target pressure by modifying a parameter affecting the operation of the pump. The modification of the parameter may be used to determine an estimated flow feedback. The controller may use the estimated flow feedback data and commanded dosing amount data to calculate a percentage error in response to and using an integrated commanded flow and an integrated estimated flow feedback to detect errors of the dosing system. The errors may include an injector stuck closed error, a blocked pressure line error, a partial blockage of a pressure line or injector error, an injector stuck open error, a disconnected pressure line error, a leakage of a pressure line or injector error. | 02-11-2016 |
20160069241 | ABNORMALITY DIAGNOSTIC DEVICE FOR A PARTICULATE FILTER - Diagnostic accuracy is improved when abnormality diagnosis of a particulate filter is carried out by using a PM sensor arranged in an exhaust passage downstream of the particulate filter. An abnormality diagnostic device for a particulate filter includes a PM sensor arranged in an exhaust passage at the downstream side of the particulate filter so as to output a signal corresponding to an amount of PM deposited in between electrodes which constitute a sensor element, and a filter diagnostic unit to carry out filter diagnostic processing in which abnormality of the particulate filter is diagnosed based on an output value of the PM sensor, wherein it is decided whether to carry out the filter diagnostic processing based on a degree of variation in the output value of the PM sensor before the filter diagnostic processing is carried out. | 03-10-2016 |
20160069242 | ABNORMALITY DIAGNOSIS SYSTEM OF AIR-FUEL RATIO SENSOR - An air-fuel ratio sensor is provided in an exhaust passage of an internal combustion engine which can perform fuel cut control, and detects an air-fuel ratio of exhaust gas. The system calculates the response time of the air-fuel ratio sensor based on a changing output value of the air-fuel ratio sensor while performing or after fuel cut control, and compares the calculated response time and a threshold value to diagnose an abnormality. The abnormality diagnosis system is configured to correct the response time so that the response of the air-fuel ratio sensor is treated as becoming faster, the smaller the lean degree of the air-fuel ratio corresponding to the converged value of the air-fuel ratio sensor during fuel cut control; and diagnose an abnormality in the response of the air-fuel ratio sensor based on the corrected calculated response time and threshold value. | 03-10-2016 |
20160177804 | DIAGNOSTIC SYSTEM FOR INTERNAL COMBUSTION ENGINE | 06-23-2016 |
20180023449 | METHOD AND SYSTEM OF UREA SOLUTION LEVEL MEASUREMENT ADJUSTMENT, DISPLAY AND HEATER OPERATION | 01-25-2018 |