Class / Patent application number | Description | Number of patent applications / Date published |
073114750 | Catalyst or catalytic converter | 66 |
20080282787 | Method for diagnosing a storage-capable catalytic converter for exhaust aftertreatment in an internal combustion engine - In a method for diagnosing a storage-capable catalytic converter of an internal combustion engine which is supplied with sufficiently hot exhaust gas so that its temperature is above the starting temperature of the exhaust gas, it is proposed that the catalytic converter is briefly supplied with cooler exhaust gas so that a cold wave passing through it forms, that the axial position of the cold wave within the catalytic converter is computed, and that the size of the storage unit is determined from the signal of an exhaust gas probe connected downstream from the catalytic converter relative to the axial position of the cold wave. According to the invention, a differentiated diagnosis method is made available by which not only the axial position or the region of damage of the storage unit can be determined, but by which the reduction of conversion of a certain pollutant A,B caused by the axial position of the damage can be indicated. | 11-20-2008 |
20090049899 | DIAGNOSTIC METHOD FOR AN EXHAUST AFTERTREATMENT SYSTEM - A diagnostic method for testing malfunction of a Selective Catalytic Reduction (SCR) exhausts aftertreatment system of an internal combustion engine. The method measures and registers a first mean NOx sensor value for a normal mass flow level of a fluid reducing agent, then a second mean NOx sensor value related to a higher mass flow level is measured and registered. The two registered NOx sensor values are compared and it is determined if, on one hand, the first value is higher than the second value, or, on the other hand, the first value is lower than the second value. The cause of the malfunction may be found in the dosing system or in the SCR catalyst. | 02-26-2009 |
20090235726 | METHOD FOR DETERMINING THE OXYGEN STORAGE CAPACITY OF A CATALYTIC CONVERTER FOR A MOTOR VEHICLE AS WELL AS AN ASSOCIATED MEASURING DEVICE - Method for determining the oxygen storage capacity of a catalytic converter for a motor vehicle using the signals of an oxygen probe upstream and an oxygen probe downstream from the catalytic converter which has the following steps of determining of a delay time which is dependent on the oxygen storage capacity between the signal of the oxygen probe upstream and the signal of the oxygen probe downstream from the catalytic converter, determining of the phase shift which is dependent on the oxygen probe dynamics between the signal of the oxygen probe upstream and the signal of the oxygen probe downstream from the catalytic converter, and correcting the determined delay time between the signal of the oxygen probe upstream and the signal of the oxygen probe downstream from the catalytic converter by a determined phase shift. | 09-24-2009 |
20100005873 | CATALYST DETERIORATION JUDGMENT DEVICE - A catalyst deterioration judgment device that can accurately perform a catalyst deterioration judgment by considering an oxygen density at downstream of an exhaust purification catalyst. The system reads outputs of an oxygen sensor and an ammonia sensor that are installed in downstream of an NSR catalyst when the catalyst is in an activate condition. When this read oxygen sensor output is equal to or more than a reference value and the ammonia sensor output is equal to or more than a reference value, it is estimated that ammonia oxidizing reaction does not occur under existence of oxygen in the NSR catalyst. In this case, the NSR catalyst is judged to be deteriorated. | 01-14-2010 |
20100050757 | METHOD AND SYSTEM TO DETERMINE THE EFFICIENCY OF A DIESEL OXIDATION CATALYST - A method for determining the efficiency of a diesel oxidation catalyst (DOC) having an inlet and an outlet for the flow of an exhaust gas stream in an exhaust system used in conjunction with an electronic controlled internal combustion engine equipped with an Electronic Control Unit (ECU) having memory, comprising: | 03-04-2010 |
20100050758 | SYSTEMS AND METHODS FOR MONITORING CATALYST DEVICE INTEGRITY - Systems and methods for monitoring catalyst presence, reverse and damage in an aftertreatment device. The disclosed systems and methods involve calculating the heat capacity of the catalyst device based on information received from sensors for measuring temperatures at the inlet and outlet of the SCR device and the exhaust mass flow. | 03-04-2010 |
20100101314 | METHOD AND APPARATUS FOR DETECTING ABNORMALITY OF NITROGEN OXIDE PURIFYING CATALYST - A method and apparatus for detecting an abnormality of a nitrogen oxide purifying catalyst using an NOx sensor, the method including: calculating a detection integrated value by integrating corresponding values corresponding to the NOx sensor output signal obtained until a first predetermined detection period has elapsed after the NOx sensor begins to generate an output signal and subtracting a variation integrated value. The variation integrated value is calculated by integrating corresponding values obtained until a predetermined second detection period has elapsed after the NOx sensor beings to generate an output signal when driven in a gas atmosphere having a constant nitrogen oxide concentration. | 04-29-2010 |
20100139380 | System for Calculating SCR Conversion Efficiency for Diesel Vehicles and Method Thereof - A system for and process of is provided for calculating SCR conversion efficiency by applying a reference control signal by which a urea dosing module is controlled to an NOx conversion value respectively in absorption and release modes of NH3 according to a loading amount of the NH3 determined from the SCR efficiency map. The system and process may include a process of determining the NOx conversion value according to a loading amount of NH3, a process of detecting the reference control signal of the dosing module injecting the urea solution, and a process of calculating the SCR conversion efficiency based on the determined NOx conversion value and reference control signal of the dosing module. | 06-10-2010 |
20100139381 | Method and Device for Monitoring an Ozone-Oxygen Conversion Means, especially for Vehicles - The invention relates to a method for monitoring the operation of an ozone-oxygen conversion means, especially for monitoring of the installation site of a heat exchanger and/or a temperature sensor (DOR sensor) of an ozone-oxygen conversion means, especially for vehicles, the ozone-oxygen conversion means having at least one catalytically coated heat exchanger through or around which air flows and through which a heat exchange medium flows, with at least one temperature sensor (DOR sensor) located on or in the heat exchanger for detecting the heat exchanger temperature, especially for detecting the surface temperature of the heat exchanger, for a defined time interval the temperature characteristics (tka, tprem) at the heat exchanger outlet and on the DOR sensor being determined and thus set into a relation to one another and/or to given comparison quantities and/or values such that evaluation of the operation of the ozone-oxygen conversion means and/or of the installation site of the catalytically coated heat exchanger and/or of the DOR sensor can be carried out, such that
| 06-10-2010 |
20100199754 | MALFUNCTION DIAGNOSIS DEVICE FOR EXHAUST GAS PURIFICATION SYSTEM AND MALFUNCTION DIAGNOSIS METHOD THEREFOR - In a malfunction diagnosis device for an exhaust gas purification system including an exhaust gas purification catalyst disposed in the exhaust passage of an internal combustion engine, and a reductant supply device that supplies reductant to exhaust gas that flows in an upstream side of the exhaust gas purification catalyst, the degree of degradation of the exhaust gas purification catalyst is diagnosed by comparing the timing at which the bed temperature of the exhaust gas purification catalyst starts to rise due to the heat of moisture adsorption reaction, against a normal value. | 08-12-2010 |
20100212415 | Systems and Methods for Providing a Catalyst - A system for providing a catalyst to a first flow of gas. The first flow of gas has an operating pressure. A pipe carries the first flow of gas from a compressor of a turbocharger to a combustion chamber. The operating pressure of the first flow of gas varies in accordance with an operation of the compressor. The system includes an enclosure, a pump, and an atomizer. The enclosure receives a portion of the first flow of gas at the operating pressure. The pump is positioned in the enclosure. The pump receives from within the enclosure the portion of the first flow of gas. The pump provides the portion of the first flow of gas at a second pressure. Any gas that exits the enclosure is provided by the pump at the second pressure. The atomizer receives a solution having the catalyst and provides a vapor having the catalyst. The portion of the first flow of gas at the second pressure carries the vapor out of the system and into the first flow of gas for delivery to the combustion chamber. A magnitude of the second pressure comprises a magnitude of the operating pressure plus a magnitude of a pressure increase provided by the pump. | 08-26-2010 |
20100212416 | ABNORMALITY DETERMINATION APPARATUS AND METHOD FOR OXYGEN SENSOR - An abnormality determination apparatus for an oxygen sensor provided on the downstream side of a catalyst includes: a first determination portion that determines whether amount of decline in output value of the oxygen sensor during a period from when amount of intake air or exhaust gas declines before a fuel cut is started to when the fuel cut is started is smaller than a reference amount of decline; a second determination portion that determines whether degree of change in the output value when the output value changes from a first reference value to a second reference value that shows a leaner state than the first reference value is more gradual than a set degree of change after the fuel cut is started; and a third determination portion that determines whether the oxygen sensor is abnormal based on determinations by the first determination portion the second determination portion. | 08-26-2010 |
20100257922 | ABNORMALITY DIAGNOSIS APPARATUS AND ABNORMALITY DIAGNOSIS METHOD FOR NOx CATALYST - An abnormality diagnosis apparatus for an NOx catalyst of the present invention measures an index value (R) regarding an NOx clarification capacity of an NOx catalyst and determines an abnormality of the NOx catalyst based on index values (R | 10-14-2010 |
20110000290 | ABNORMALITY DIAGNOSIS APPARATUS AND ABNORMALITY DIAGNOSIS METHOD FOR NOx SENSOR - An exhaust passage ( | 01-06-2011 |
20110056279 | Method for Checking a Catalytic Converter Oxygen Storage Reservoir for Sufficient Storage Capacity - Four cases are to be distinguished from one another for an exhaust gas line of a motor vehicle with an oxygen storage reservoir and a lambda probe located downstream from at least part of the oxygen storage reservoir, specifically in each case, whether or not the oxygen storage reservoir has sufficient storage capacity and whether or not the lambda probe is fully serviceable. For this purpose, the exhaust gas line is supplied in an alternating sequence with rich and lean exhaust gas, in two different passes the degree of oxygen filling being varied differently. For a minor variation of the degree of oxygen filling, the serviceability of the lambda probe can be deduced on the basis of certain criteria. If the lambda probe is fully serviceable, the sufficiency or insufficiency of the oxygen storage capacity of the oxygen storage reservoir can be deduced for a greater variation of the degree of oxygen filling. | 03-10-2011 |
20110056280 | METHOD FOR VERIFYING THE AGING CONDITION OF A CATALYTIC CONVERTER ON BOARD A VEHICLE - The invention describes a method for determining the light-off temperature of a catalytic converter on board a vehicle. The aging condition of the catalytic converter is determined by means of the method. To test the catalytic converter, the latter is loaded for example with a CO/HC test pulse. During the combustion of the additional CO and HC on the catalytic converter, an axial temperature profile is generated. The position of the maximum of said temperature profile along the catalytic converter is dependent on the current light-off temperature. The temperature profile travels through the catalytic converter and can be measured at the outlet of the catalytic converter as a time-dependent profile. The original axial temperature profile can be inferred from the time-dependent profile. Using a calculation program, the current light-off temperature of the catalytic converter on the vehicle can be determined. The method has the advantage that the test can take place at exhaust-gas temperatures considerably higher than the light-off temperature. In this way, it is ensured that the test pulse does not lead to increased pollutant emissions. | 03-10-2011 |
20110107827 | Method for Testing the Functionality of an Oxidation Catalyst of an Internal Combustion Engine - A method of testing the functionality of an oxidation catalytic converter of an internal combustion engine, particularly a diesel engine, of a motor vehicle, includes the following steps: (a) verifying whether the motor vehicle is at a standstill; (b) verifying whether the internal combustion engine is idling; (c) verifying whether a temperature lies within a predetermined range upstream and downstream of the oxidation catalyst. Then, if all of the steps (a) to (c) yield an affirmative result, an intervention in the engine management is made in such a way that a predetermined temperature is set in the oxidation catalyst; (e) hydrocarbons (HCs) are actively produced by post-injecting fuel at a late point in time; (f) a lambda value is measured upstream and downstream of the oxidation catalyst as soon as the predetermined temperature from step (d) has been reached, and while HCs are actively produced in step (e). Then, a difference is determined between the lambda values measured upstream and downstream of the oxidation catalyst. If the difference is less than a predetermined value, a conclusion is reached that the oxidation catalyst is damaged. | 05-12-2011 |
20110113872 | MULTI-ZONE FURNACE - The present invention relates to a multi-zone furnace for heating and tempering reactors and pipes in devices. The multi-zone furnace according to the invention is modularly constructed, wherein it is e.g. possible to efficiently heat or cool the furnace or also individual zones of the furnace. Furthermore, exchangeable cassettes provide the advantage that the reactors and the components, which are connected to the reactors, are particularly well accessible, wherein reconverting work is facilitated. | 05-19-2011 |
20110296905 | METHOD FOR MONITORING AN SCR CATALYTIC CONVERTER - A method is provided for monitoring an SCR catalytic converter ( | 12-08-2011 |
20110314905 | Systems and Methods for Providing a Catalyst - A system for providing a catalyst to a first flow of gas. The first flow of gas has an operating pressure for transporting the first flow of gas to a provided combustion chamber. The operating pressure established by a compressor of a provided turbocharger. The system includes a pump and an atomizer. The pump receives a portion of the first flow of gas. The atomizer receives a solution comprising the catalyst and provides a vapor comprising the catalyst. The pump provides the portion of the first flow of gas at a second pressure greater than the operating pressure. The portion of the first flow of gas at the second pressure carries the vapor out of the system and into the first flow of gas for delivery to the combustion chamber. | 12-29-2011 |
20120031178 | METHOD FOR DETERMINING THE OXYGEN STORAGE CAPACITY OF A CATALYTIC CONVERTER - An offset in the signal of a pre-catalytic converter lambda probe of an exhaust gas system of an internal combustion engine affects a measured oxygen intake storage capacity and a measured oxygen removal storage capacity of an oxygen store with identical magnitude, but with opposite mathematical sign, so that their sum is independent of the offset. The oxygen intake storage capacity and the oxygen removal storage capacity are hereby determined until the output signal of the post-catalytic converter probe exceeds an intermediate threshold value of, for example, 0.45 V for intake and 0.8 V for removal. Exposure of the oxygen store to rich and/or lean exhaust gas is maintained after this threshold value has been crossed to ensure that the oxygen store is indeed sufficiently filled after the oxygen intake storage capacity has been measured, or is sufficiently emptied after the oxygen removal storage capacity has been measured. | 02-09-2012 |
20120067114 | DETECTION OF AFTERTREATMENT CATALYST DEGRADATION - An exemplary embodiment is a system, including an internal combustion engine fluidly coupled to an exhaust gas flowpath, an aftertreatment system disposed in the exhaust gas flowpath, where the aftertreatment system includes a NO | 03-22-2012 |
20120131992 | CATALYST DETERIORATION DIAGNOSTIC DEVICE AND DIAGNOSTIC METHOD - A device for diagnosing deterioration of a catalyst by a decrease in oxygen storage capacity, in which the oxygen storage capacity by which the catalyst deterioration is diagnosed to be present when exhaust gas recirculation is not implemented is higher than the oxygen storage capacity by which the catalyst deterioration is diagnosed to be present when the exhaust gas recirculation is implemented. | 05-31-2012 |
20120180558 | METHOD FOR MONITORING EXHAUST GAS AFTERTREATMENT DEVICES - A method for monitoring performance of a passive selective catalytic reduction system includes operating the internal combustion engine in a preconditioning mode. Subsequent to the preconditioning, an air/fuel excursion is introduced into the exhaust gas feedstream and a signal output from a sensor monitoring the exhaust gas feedstream in the selective catalytic reduction system during the air/fuel excursion is monitored. An operating effectiveness is determined for the selective catalytic reduction system correlated to the signal output from the sensor monitoring the exhaust gas feedstream. | 07-19-2012 |
20120204629 | EXHAUST CATALYST TEMPERATURE ESTIMATING APPARATUS AND EXHAUST CATALYST TEMPERATURE ESTIMATION METHOD FOR INTERNAL COMBUSTION ENGINE - A exhaust catalyst temperature estimating apparatus is provided for estimating a exhaust catalyst temperature of a exhaust catalyst in which a catalyst is loaded on a support and arranged in an exhaust system of an internal combustion engine. The exhaust catalyst temperature estimating apparatus estimates the exhaust catalyst temperature using a first model formula to calculate a current exhaust catalyst temperature of the exhaust catalyst based on a parameter corresponding to a current exhaust gas status. The first model formula is empirically determined such that a exhaust catalyst temperature that excludes heat generated by a chemical reaction is calculated for the parameter by using the support prior to being loaded with the catalyst, or is a physical formula of the support prior to being loaded with the catalyst such that a exhaust catalyst temperature excludes heat generated by a chemical reaction is calculated for the parameter. | 08-16-2012 |
20120304751 | METHODS AND SYSTEMS FOR DIAGNOSTICS OF AN EMISSION SYSTEM WITH MORE THAN ONE SCR REGION - Methods and systems for controlling and/or diagnosing an emission control system of a vehicle having a first SCR region upstream of a second SCR region are provided herein. One exemplary method includes, indicating degradation based on a first SCR region performance during a first condition; and indicating degradation based on a second SCR region performance during a second condition, the first condition different than the second condition. In this way, different levels of degradation among different SCR regions may be used to indicate emissions levels have increased above a threshold value, for example. | 12-06-2012 |
20130014575 | EXHAUST DIAGNOSTIC SYSTEM AND METHOD WITH SCR NH3 DEPLETION CLEANSING MODE FOR INITIAL STEP IN THE DEF QUALITY SERVICE HEALING TEST - An exhaust diagnostic system comprises a selective catalyst reduction (SCR) component testing module, an exhaust stream temperature management module, and a test enabling module. The component testing module executes an SCR component efficiency test. The exhaust stream temperature management module adjusts a temperature of the SCR component to a predetermined temperature range. The test enabling module executes a process for depleting a reductant load and subsequently initiates an SCR component efficiency test while the temperature of the SCR catalyst is within the predetermined temperature range. | 01-17-2013 |
20130036808 | CATALYST ANOMALY DIAGNOSTIC SYSTEM - Active air-fuel ratio control is performed to alternately control an air-fuel ratio in an area located upstream of a catalyst between a lean side and a rich side. Switching is carried out between lean control and rich control at the same time when an output from a post-catalyst sensor reaches a threshold. Whether the catalyst is normal or abnormal is determined based on the rate of a change in the output from the post-catalyst sensor between a first point of time when a pre-catalyst air-fuel ratio reaches stoichiometry after the output from the post-catalyst sensor reaches the threshold and a second point of time when the output from the post-catalyst sensor reaches the threshold next time. | 02-14-2013 |
20130055803 | COMPETENCE DIAGNOSIS SYSTEM FOR UREA WATER TEMPERATURE SENSOR - A competence diagnosis system for a urea water temperature sensor that can prevent a misdiagnosis when urea water is replenished in a urea tank. The system includes a urea water level condition determination unit that stores a urea water level, which is measured by a level sensor provided in the urea tank, in a storage unit immediately before key-off, obtains a level difference between the urea water level stored in the storage unit and a current urea water level after key-on, and allows a diagnosis by the competence diagnosis unit through temperature comparison when the level difference is less than or equal to a predetermined threshold value. | 03-07-2013 |
20130061665 | SELECTIVE CATALYTIC REDUCTION SENSOR - Provided is an SCR sensor that does not degrade a measurement accuracy of a quality sensor even when a remaining amount of a urea tank is reduced. A quality sensor | 03-14-2013 |
20130098146 | CATALYST DETERIORATION DETECTION APPARATUS AND CATALYST DETERIORATION DETECTION METHOD FOR INTERNAL COMBUSTION ENGINE - Provision is made for a catalyst that is arranged in an exhaust passage of an internal combustion engine and has an oxidation function, downstream side temperature detection means that detects the temperature of an exhaust gas at a downstream side from the catalyst, and addition means that adds a reducing agent into the exhaust gas from an upstream side from the catalyst, wherein there are also provided correlation value calculation means that calculates a correlation value which is correlated with an amount of change of the temperature detected by the downstream side temperature detection means when the reducing agent is added by the addition means and when a transient operation of the internal combustion engine is carried out, and determination means that determines a deterioration of the catalyst by making a comparison between the correlation value and a threshold value which indicates the deterioration of the catalyst. | 04-25-2013 |
20130180322 | CATALYST ABNORMALITY DIAGNOSIS APPARATUS - Active air-fuel ratio control is performed to alternately control an air-fuel ratio in an area located upstream of a catalyst between a lean side and a rich side. The amount of oxygen absorbed and released by the catalyst during lean control and rich control of the air-fuel ratio is measured. When an output from the post-catalyst sensor reaches a predetermined threshold, switching is carried out between the lean control and the rich control, and the measurement of the amount of oxygen is ended. The threshold is set to be reached before the output from the post-catalyst sensor reaches a predetermined reference value. Whether the catalyst is normal or abnormal is determined based on the amount of oxygen measured until the output from the post-catalyst sensor reaches the threshold and behavior of the output from the post-catalyst sensor observed after the output from the post-catalyst sensor reaches the threshold. | 07-18-2013 |
20130180323 | METHOD FOR MONITORING AN SCR SYSTEM - A method for detecting whether an injector with a valve controlled by a PWM signal of an SCR system is clogged, the SCR system including a rotary positive-displacement pump driven by a motor and pressure of which is controlled by a controller that continuously measures rotational speed of the motor and pressure at an outlet of the pump. During operation of the SCR system at a given pressure: the associated average rotational speed is measured; the speed is held at the measured value; a curve of a change in pressure is compared to reference curves stored in a memory and a condition of the injector, for example whether the injector is clogged or not, is deduced therefrom. | 07-18-2013 |
20130228008 | DEVICE AND METHOD OF DETERMINING DETERIORATION OF CATALYST - A catalyst determining device includes an oxidation catalyst disposed in an outlet passage in an engine, the oxidation catalyst including an adsorption substance for adsorbing and desorbing an exhaust component in exhaust and a catalytic substance capable of oxidizing the exhaust component, a calculating unit for calculating a difference in oxygen concentration between upstream and downstream of the oxidation catalyst, and a determination unit for determining the deterioration of the oxidation catalyst through comparison of a plurality of the differences in oxygen concentration obtained at different temperatures of the oxidation catalyst by the calculating unit. | 09-05-2013 |
20130291630 | FAILURE DETECTION APPARATUS FOR AN ELECTRICALLY HEATED CATALYST - Whether or not an electrically heated catalyst is normal is detected by accurately detecting whether the temperature of the electrically heated catalyst has gone up. To this end, provision is made for an air fuel ratio control device that adjusts an air fuel ratio of an exhaust gas flowing into the electrically heated catalyst to a rich air fuel ratio, at the time of starting of an internal combustion engine, a downstream side detection device that is arranged at the downstream side of the electrically heated catalyst and detects a concentration of oxygen in the exhaust gas, and a determination device that determines whether the electrically heated catalyst is electrically energized, based on the time at which the oxygen concentration detected by the downstream side detection device changes to a value indicating a rich air fuel ratio at the time when the air fuel ratio of the exhaust gas is adjusted by the air fuel ratio control device to the rich air fuel ratio, after starting of the internal combustion engine. | 11-07-2013 |
20130298655 | SERVICE TEST FOR EXHAUST GAS TREATMENT SYSTEM - A service procedure to test the SCR device involves turning on an upstream and downstream SCR NOx sensor, turning off an NH | 11-14-2013 |
20140000354 | SYSTEM FOR SENSING SOOT OF DIESEL VEHICLE | 01-02-2014 |
20140020461 | CATALYST DETERIORATION DIAGNOSTIC DEVICE AND DIAGNOSTIC METHOD - A device for diagnosing deterioration of a catalyst by a decrease in oxygen storage capacity, in which the oxygen storage capacity by which the catalyst deterioration is diagnosed to be present when exhaust gas recirculation is not implemented is higher than the oxygen storage capacity by which the catalyst deterioration is diagnosed to be present when the exhaust gas recirculation is implemented. | 01-23-2014 |
20140123744 | SIMULATED GAS SUPPLY APPARATUS - A simulated gas supply apparatus includes a raw gas source group including a plurality of raw gas sources, a plurality of flow controller groups, each of which includes a plurality of flow controllers, a flow control system including the flow controller groups, a primary supply pipe for supplying a simulated gas to an evaluation device, a primary exhaust pipe for exhausting the simulated gas, a switching valve system including a plurality of switching valves so as to switch the simulated gas flow between the primary supply pipe and the primary exhaust pipe, and a controlling unit that controls the flow control system and the switching valve system. | 05-08-2014 |
20140144220 | DIAGNOSTIC OPERATION STRATEGY FOR DIESEL OXIDATION CATALYST AGING LEVEL DETERMINATION USING NOX SENSOR NO2 INTERFERENCE - A method of determining aging of a diesel oxidation catalyst (DOC) in an engine exhaust system includes receiving a first sensor signal from a first nitrogen oxides (NOx) sensor positioned in exhaust flow upstream of the DOC. The first sensor signal is indicative of an amount of NOx in the exhaust flow upstream of the DOC. The method further includes receiving a second sensor signal from a second NOx sensor positioned in the exhaust flow downstream of the DOC. The second sensor signal is indicative of an amount of NOx downstream of the DOC. A difference between the first sensor signal and the second sensor signal is calculated by a controller. A DOC aging level based on a predetermined correlation between the difference and DOC aging can then be determined by the controller if at least one predetermined operating condition is satisfied. | 05-29-2014 |
20140150541 | ON-BOARD DIAGNOSTICS SYSTEM - An on-board diagnostics system for an exhaust system of an internal combustion engine is disclosed. The system comprises one or more ferromagnetic materials and a means for measuring magnetic field strength. Also disclosed is a method for on-board diagnostics of a catalyst component in the exhaust system. The method comprises measuring the magnetic field strength of a ferromagnetic material located in close proximity to the catalyst component and determining whether the ferromagnetic material has been exposed to a temperature above the Curie temperature of the ferromagnetic material, as measured by a decrease in the measured magnetic field strength. | 06-05-2014 |
20140208838 | MICRO ELECTRO MECHANICAL SYSTEM CATALYTIC COMBUSTIBLE GAS SENSOR USING POROUS MEMBRANE EMBEDDED MICRO-HEATER - Provided is a catalytic combustible gas sensor using a porous membrane embedded micro-heater and a micro electro mechanical system (MEMS) technology. The present disclosure provides a gas sensor that is structurally, mechanically, and electrically stable, and has a simple device fabrication process in a MEMS catalytic combustible gas sensor that is miniaturized and also consumes a significantly small amount of power by puncturing a plurality of holes in membranes, a heating resistor, and a sensing electrode, by etching and thereby thermally isolating a substrate by a predetermined thickness through the plurality of holes, and by including a sensing structure formed using a sensing material and a compensation structure formed using a compensation material. | 07-31-2014 |
20140245822 | METHOD AND DEVICE FOR MONITORING A NITROGEN OXIDE STORAGE CATALYTIC CONVERTER - A method for monitoring a nitrogen oxide storage catalytic converter (NSC) in the exhaust gas duct of an internal combustion engine which is operated at least temporarily in a lean fashion, wherein during a lean mode of the internal combustion engine nitrogen oxides from the exhaust gas are stored by the nitrogen oxide storage catalytic converter, wherein during a regeneration phase of the nitrogen oxide storage catalytic converter the internal combustion engine is operated in a rich fashion, and as a result the nitrogen oxides stored in the nitrogen oxide storage catalytic converter are removed, and wherein an exhaust gas component or exhaust gas characteristic variable which is characteristic of the profile of the regeneration is detected during the regeneration phase by means of an exhaust gas probe. | 09-04-2014 |
20140250993 | CATALYST-DEGRADATION DETECTION DEVICE - An oxygen amount (an oxygen storage amount OSA) stored by metal cerium during a storage cycle is obtained based on an output value of an A/F sensor in a time period immediately before an exhaust air-fuel ratio (a downstream side A/F) detected by the A/F sensor shifts to a lean region, and degradation relating to OSC of the three-way catalyst is detected. In the storage cycle, a target air-fuel ratio is set so that an air-fuel ratio of exhaust emission flowing into an S/C changes from rich to lean. Therefore, the downstream side A/F shifts from stoichiometry to the lean region at a time after reaching stoichiometry. When the three-way catalyst degrades, the downstream side A/F shifts to the lean region from stoichiometry at a time. Therefore, the calculated oxygen storage amount OSA becomes extremely smaller as compared with that at a normal time. | 09-11-2014 |
20140283589 | INTEGRATED FUEL CATALYST MONITOR - A method of monitoring catalyst performance may comprise applying a set of parameter readings for a given sample to a support vector machine to generate a classification output, clustering the set of parameter readings to reduce a number of support vectors, computing a total fuel mass following a deceleration fuel shut-off event and an exhaust gas oxygen sensor switch and indicating catalyst degradation based on the total fuel mass. | 09-25-2014 |
20140290348 | ABNORMALITY DETECTING DEVICE OF INTERNAL COMBUSTION ENGINE - An abnormality detecting device of an internal combustion engine according to the present invention includes a sensor nick abnormality detecting unit configured to detect a nick abnormality in a detecting element of a downstream side sensor which is provided in a downstream side of an exhaust gas purifying catalyst in an exhaust passage and generates an output corresponding to an oxygen concentration in exhaust gas, on the basis of a matter that a distribution of an output of the downstream side sensor is biased to an area in which the air-fuel ratio is leaner than a theoretical air-fuel ratio, and an inhibiting unit configured to inhibit detection of the nick abnormality of the detecting element by the sensor nick abnormality detecting unit in the case that an intake air amount exceeds a predetermined amount. | 10-02-2014 |
20140331752 | EXHAUST AFTERTREATMENT SYSTEM DIAGNOSTIC AND CONDITIONING - An engine diagnostic tool includes a diagnostic engine calibration module structured to include a plurality of diagnostic processes for operating an internal combustion engine system of an immobilized vehicle. One or more of the plurality of diagnostic processes are structured to be an intrusive diagnostic process for the internal combustion engine system, wherein the intrusive diagnostic process causes the internal combustion engine system to operate outside of one or more calibration parameters. The diagnostic engine module is further structured to control the order and timing of each diagnostic process in the plurality of diagnostic processes. | 11-13-2014 |
20140338434 | ADAPTIVE SOOT MASS ESTIMATION IN A VEHICLE EXHAUST AFTER-TREATMENT DEVICE - A method of estimating a total amount of soot in a diesel particulate filter includes monitoring a pressure differential across the diesel particulate filter; monitoring an engine speed and an engine load from an engine in fluid communication with the diesel particulate filter; determining a first soot mass estimate from the monitored pressure differential, the first soot mass estimate having an associated confidence indicator based on the monitored engine speed and engine load; determining a second soot mass estimate from the monitored engine speed and engine load; and outputting the first soot mass estimate if the confidence indicator is above a predetermined threshold, and outputting the second soot mass estimate if the confidence indicator is below the predetermined threshold. | 11-20-2014 |
20140338435 | HOLDING JIG AND PRESSURE LOSS MEASURING DEVICE - A holding jig has a tubular jig base member, and a tubular expansion/contraction member disposed on an inner peripheral surface side of the tubular jig base member. Both end sides of the tubular expansion/contraction member are fixed to both end sides of the tubular jig base member along the whole periphery. A configuration of an inner peripheral surface of the tubular expansion/contraction member is smaller than a surface configuration of a pillar-like body (a honeycomb structure) to be held. On the other hand, a configuration of an inner peripheral surface of the tubular jig base member is larger than the surface configuration of the pillar-like body (the honeycomb structure) to be held. | 11-20-2014 |
20150033837 | METHOD FOR MONITORING AN EXHAUST SYSTEM - A method and an arrangement for monitoring an exhaust system of an internal combustion engine. Temperature profiles upstream and downstream of an installation location of a catalytic converter are measured in order to determine whether or not a catalytic converter is installed. | 02-05-2015 |
20150068295 | OXIDATION CATALYST/HYDROCARBON INJECTOR TESTING SYSTEM - An oxidation catalyst (OC)/hydrocarbon injector (HCI) testing system includes a controller having a first oxygen sensor input configured and disposed to receive a first oxygen sensor value upstream of an oxidation catalyst (OC) device and a second oxygen sensor input configured to receive a second oxygen sensor value downstream of the OC device. The controller is configured and disposed to perform a first test to detect one of a faulty OC device and a faulty HCI based on a difference between the first and second oxygen sensor values. | 03-12-2015 |
20150075270 | REDUCTANT DELIVERY PERFORMANCE DIAGNOSTICS SYSTEM - A method for diagnosing reductant delivery performance of a reductant delivery system is provided. The method provides an outlet pressure sensor at a reductant outlet of the reductant delivery system and a virtual pressure sensor in an exhaust stream where reductant is injected into the stream. The method comprises calculating a downstream reductant flow rate using the outlet pressure sensor and the virtual pressure sensor; and calculating an upstream reductant flow rate within the reductant delivery system using at least one of a temperature sensor, a pressure sensor and a control valve. The calculated downstream and upstream reductant flow rates are compared, and diagnostics is conducted based the comparison to find the malfunctions in the reductant delivery system. An intrusive self-consistent diagnostics method allows for detection of malfunctions in the outlet pressure sensor and the virtual pressure sensor can be determined | 03-19-2015 |
20150090020 | METHOD AND SYSTEM FOR DIAGNOSING DETERIORATION OF EXHAUST EMISSION CONTROL CATALYST - A deterioration diagnosing system for an exhaust emission control catalyst of an engine is provided. The catalyst includes an HC adsorbing part and an oxidation catalyst part. The system includes an actual exhaust-emission-control-catalyst temperature parameter detecting module for detecting a parameter correlating with an actual exhaust-emission-control-catalyst temperature. The catalyst also includes a deterioration determining module for receiving a detection value from the actual exhaust-emission-control-catalyst temperature parameter detecting module when predetermined diagnosis executing conditions are met, and determining that the exhaust emission control catalyst is deteriorated when the detection value is smaller than a predetermined diagnostic temperature parameter threshold. The catalyst also includes an HC discharge amount calculating module for calculating an amount of discharging HC from the HC adsorbing part. The catalyst also includes a false deterioration determination preventing module for receiving a signal from the HC discharge amount calculating module and preventing false determination of the deterioration determining module. | 04-02-2015 |
20150143884 | Method and Apparatus for Estimating a Dosing-Error in a Selective Catalytic Reduction System - A method for determining if a selective catalytic reduction (SCR) device that is dosed with a reductant is being mis-dosed by considering an expected exhaust gas output state from the SCR device and measured exhaust gas output state, a NOx sensor sensitivity figure that is an indication of how sensitive the measured exhaust gas output state is to dosing errors and performing cross-correlation operations. | 05-28-2015 |
20150315950 | ABNORMALITY DETECTION DEVICE FOR EXHAUST GAS PURIFICATION APPARATUS - An object of the present invention is to distinguish and detect an abnormality of SCRF and an abnormality of a diffusing device in a system in which a diffusing device is provided for an exhaust gas passage between a filter (SCRF) including an SCR catalyst carried thereon and a reducing agent addition valve. In the present invention, it is judged that which one of abnormalities of any clogging-up of SCRF caused by PM, any breakage of SCRF, and any abnormality of a diffusing device occurs, on the basis of at least any one of a difference between a NOx purification rate of an SCR catalyst carried on SCRF and a predetermined NOx purification rate and a difference between a PM amount flowing out from SCRF and a predetermined outflow PM amount, when a difference, which is provided between an exhaust gas pressure difference as a difference between an exhaust gas pressure on an upstream side from a reducing agent addition valve and an exhaust gas pressure on a downstream side from SCRF and a predetermined exhaust gas pressure difference, exceeds a certain amount. | 11-05-2015 |
20160018289 | TESTING CATALYTIC EFFICIENCY OF AN EXHAUST COMPONENT - The present invention relates to an apparatus and method for testing the catalytic efficiency of exhaust components, particularly exhaust components used in heavy-duty diesel engine exhaust systems. The exhaust component typically has a plurality of elongate channels through which exhaust gases flow, the channels extending between a first end face and a second end face of the exhaust component. The method comprises causing an exhaust gas to flow through the exhaust component, and making measurements of a property of the exhaust gas before and after it has flowed through the exhaust component, wherein the flow of the exhaust gas through the channels is restricted such that the volume of the exhaust component through which the exhaust gas flows is reduced. | 01-21-2016 |
20160061087 | METHOD FOR DETERMINING DEGRADATION OF NOx STORAGE REDUCTION CATALYST IN EXHAUST GAS AFTERTREATMENT DEVICE - An occlusion cycle and a rich reduction cycle are repeated alternately in a NOx occlusion reduction catalyst connected to an exhaust pipe of an engine. When a NOx occlusion rate decreases while the occlusion cycle and the rich reduction cycle are being repeated, a sulphur purge is performed. A NOx occlusion map, which indicates the NOx occlusion amount of the NOx occlusion reduction catalyst during the occlusion cycle, as affected by aging degradation, is prepared in advance, and an ideal NOx occlusion amount is determined based on the NOx occlusion map. In the meantime, an actual NOx occlusion amount during the occlusion cycle is calculated from a NOx sensor value. Degradation of the NOx occlusion reduction catalyst due to sulfur poisoning is distinguished from thermal degradation of the NOx occlusion reduction catalyst based on the difference between the ideal NOx occlusion amount and the actual NOx occlusion amount. | 03-03-2016 |
20160076423 | DIAGNOSTIC DEVICE FOR UREA WATER SUPPLY SYSTEM - A diagnostic device for a urea water supply system having a sensor for detecting a concentration of urea water includes an acquisition section that acquires a detected value of the sensor, a calculation section that calculates a NOx purification rate η by a selective reduction catalyst, and a diagnosis section that diagnoses a state of the urea water supply system. The diagnosis section is adapted to diagnose that the sensor is abnormal when only one of a first condition and a second condition is satisfied. The first condition is that the purification rate η calculated by the calculation section is greater than or equal to a reference purification rate. The second condition is that the detected value Cur acquired by the acquisition section is greater than or equal to a reference concentration. | 03-17-2016 |
20160146080 | METHOD AND APPARATUS FOR MONITORING FLUID REDUCTANT FOR INTERNAL COMBUSTION ENGINE EXHAUST - A method and means of determining the quality of a fluid reductant used in selective catalytic reduction to reduce NOx emissions from an internal combustion engine. Short and long term average of NOx conversion efficiency are compared with thresholds, in order to determine if failure of selective catalytic reduction is due to incorrect reductant, or to failure of the catalyst device. | 05-26-2016 |
20160160730 | CATALYST DETERIORATION DIAGNOSIS METHOD - A method for diagnosing the degree of deterioration of a catalyst disposed in an exhaust path of an internal combustion engine and oxidizes or adsorbs a target gas, including at least one of a hydrocarbon gas and a carbon monoxide gas in an exhaust gas from the internal combustion engine, is adapted to determine whether deterioration exceeding an acceptable level of a catalyst occurs or not by comparing the concentration of a target gas detected downstream from the catalyst in the exhaust path when a diagnosis-gas atmosphere containing a target gas higher in concentration than a target gas during a steady-operation state of the internal combustion engine is intentionally produced and introduced into the catalyst with a threshold value corresponding to the temperature of a catalyst at the timing which the diagnosis-gas atmosphere is introduced. | 06-09-2016 |
20160161370 | CATALYST DETERIORATION DIAGNOSIS SYSTEM AND CATALYST DETERIORATION DIAGNOSIS METHOD - A system for diagnosing the degree of deterioration of a catalyst disposed in an exhaust path of an internal combustion engine and oxidizes or adsorbs a target gas in an exhaust gas, includes a temperature sensor measuring a temperature of the exhaust gas at the upstream from a catalyst in an exhaust path and a gas sensor detecting a target gas at the downstream of the exhaust path and outputting an output value in accordance with a concentration of the target gas, wherein a control element is configured to diagnose the degree of deterioration in the catalyst, based on at least the output value in the gas sensor, the temperature of the catalyst identified based on a measurement value in the temperature sensor, and the threshold value at the temperature of the catalyst. | 06-09-2016 |
20160161371 | CATALYST DETERIORATION DIAGNOSIS METHOD - A method for diagnosing the degree of deterioration of a catalyst disposed in an exhaust path of an internal combustion engine and oxidizes or adsorbs a target gas, including at least one of a hydrocarbon gas and a carbon monoxide gas, in an exhaust gas from the internal combustion engine, is adapted to determine whether deterioration exceeding an acceptable level of a catalyst occurs or not by comparing, at any timing when the internal combustion engine is in a state of a steady operation, the concentration of a target gas detected downstream from the catalyst in the exhaust path with a threshold value of the concentration of a target gas corresponding to the temperature of a catalyst at the timing which is previously defined according to an allowable range of an index value representing the degree of oxidation or adsorption at the catalyst corresponding to the temperature of a catalyst at the timing. | 06-09-2016 |
20160161430 | APPARATUS, SYSTEM, AND METHOD FOR CATALYST PRESENCE DETECTION - A system to detect the presence of a catalyst includes an exhaust gas tube, a first temperature sensing device, a second temperature sensing device, a flow rate measurement device, and a processing device. The first temperature sensing device measures a first temperature of exhaust gas upstream of the exhaust gas tube. The second temperature sensing device measures a second temperature of the exhaust gas downstream of the exhaust gas tube. The processing device estimates an expected time delay between the measured inlet and outlet exhaust gas temperatures corresponding to a system with a catalyst present. The processing device may also determine the presence of a catalyst by comparing the measured second temperature to the measured first temperature and comparing the measured second temperature to an estimated delayed first temperature associated with the expected time delay. | 06-09-2016 |
20160169076 | METHOD FOR MONITORING AN OXIDATION CATALYSIS DEVICE | 06-16-2016 |
20160201540 | GAS SENSOR CONTROL DEVICE | 07-14-2016 |
20160251996 | CATALYST DETERIORATION DIAGNOSIS APPARATUS | 09-01-2016 |