Class / Patent application number | Description | Number of patent applications / Date published |
073114710 | Exhaust gas component analysis | 74 |
20090044612 | METHOD TO DIAGNOSE AN EXHAUST GAS SENSOR DISPOSED IN AN EXHAUST GAS REGION OF AN INTERNAL COMBUSTION ENGINE AND DEVICE TO IMPLEMENT THE METHOD - A method to diagnose an exhaust gas sensor disposed in the exhaust gas region of an internal combustion engine, wherein provision is made for a comparison of a measurement for at least one exhaust gas component with a measurement of the exhaust gas component, which is ascertained on the basis of an exhaust gas sensor signal, and a device to implement the method are proposed. The diagnosis is only implemented if a change in at least one operating parameter of the internal combustion engine and/or at least one parameter of the exhaust gas is detected during the running operation of the internal combustion engine. Provision is made in the diagnosis for an averaging of the measurement for at least the one exhaust gas component as well as of the measurement for the exhaust gas component, which is provided by the exhaust gas sensor. Provision is additionally made for a subsequent comparison of the two averages and for an error signal to be provided if the difference of the two averages exceeds a difference threshold value. The procedural approach allows for the diagnosis to occur without a diagnostic intervention into the operation of the internal combustion engine and without an intervention into an open-loop control, which if need be is present, for the metering of a reagent substance, which is introduced into the exhaust gas region of the internal combustion engine to convert at least one exhaust gas component. | 02-19-2009 |
20090217745 | EXHAUST GAS SENSOR - Exhaust-gas sensors that have a sensor element, which is surrounded by two protective tubes on a side facing the exhaust gas and which is additionally protected by a porous fiber package, are already known. The fiber package is disposed between the two protective tubes and is meant to protect the sensor element from thermal shock by water droplets hitting the sensor element. When the exhaust gas sensor is used as primary catalytic converter or raw emission sensor, the sensor element can get damaged by sulfur compounds contained in the exhaust gas. In the exhaust-gas sensor according to the invention, damage to the sensor element by exhaust-gas components contained in the exhaust gas is reliably prevented. According to the invention, the adsorption means is implemented in such a way that sulfur, phosphorus or silicon compounds are trapped irreversibly. | 09-03-2009 |
20090241653 | EXHAUST GAS SENSING SYSTEM AND METHODS FOR SENSING CONCENTRATIONS OF EXHAUST GAS CONSTITUENTS - Exhaust gas sensing system and methods for sensing concentrations of exhaust gas constituents are provided. The exhaust gas sensing system includes a NO | 10-01-2009 |
20090255328 | METHOD FOR PERFORMING A DIAGNOSTIC ON AN EXHAUST GAS ANALYZER PROBE DISPOSED IN THE EXHAUST SYSTEM OF AN INTERNAL COMBUSTION ENGINE AND DEVICE FOR IMPLEMENTING THE METHOD - A method for performing a diagnostic on an exhaust gas analyzer probe disposed in the exhaust system of an internal combustion engine, and a device for implementing the method are provided. The method performs the evaluation of the exhaust gas analyzer probe after recognition of a special operating phase, e.g., an overrun phase, of the internal combustion engine by setting off a specifiable injection that is torque-neutral or not perceptible for the operator, on the basis of the predicted probe signal pattern and taking into account the delay time of the probe signal. | 10-15-2009 |
20090272181 | SYSTEM AND METHOD FOR QUANTIFYING THE PRESENCE OF COMPONENTS IN THE EXHAUST OF COMMERCIAL AND/OR HEAVY-DUTY VEHICLES - A system and/or method for quantifying the presence of one or more components in vehicle exhaust, and more particularly to a non-contact, extractive sampling system and method for quantifying the presence of one or more components in exhaust emissions of commercial and/or heavy-duty vehicles that emit exhaust at an elevated level, under actual operating conditions. | 11-05-2009 |
20090277259 | ESTIMATION OF ENGINE-OUT NOx FOR REAL TIME INPUT TO EXHAUST AFTERTREATMENT CONTROLLER - A method and system for estimating engine-out NOx from a diesel engine. The estimation is calculated from a mathematical model that expresses engine-out NOx as functions of cylinder pressure, intake oxygen, and effective temperature, respectively. Input data for each of these functions may be obtained from fuel quantity data and from measured data, the latter including intake pressure, cylinder pressure, intake oxygen concentration, coolant temperature, and intake manifold temperature. | 11-12-2009 |
20090301180 | EXHAUST SENSOR APPARATUS AND METHOD - Some embodiments include a housing including a dielectric portion, a particulate matter (“PM”) sensor fixed inside the housing such that the exhaust streaming through an exhaust system passes near and in electrical isolation from the PM sensor, the PM sensor including a terminal couplable to a PM sensing circuit to produce a PM sensor indication associated with sensed PM and a fastener coupled to the housing and mountable to the exhaust system to dispose the housing into the exhaust system such that exhaust streaming through the exhaust system passes outside the dielectric portion of the housing. | 12-10-2009 |
20100071451 | Apparatus for and Method of Detecting Abnormality in Exhaust Gas Temperature Sensor - On the basis of a correlation between exhaust gas temperature detected by an exhaust gas temperature sensor and exhaust gas temperature estimated according to an engine operating condition, it is detected whether or not abnormality occurs in the exhaust gas temperature sensor. Namely, when a change characteristic of the detected exhaust gas temperature follows a change characteristic of the estimated exhaust gas temperature, it is determined that the exhaust gas temperature sensor is normal. On the other hand, when the change characteristic of the detected exhaust gas temperature does not follow that of the estimated exhaust gas temperature, it is determined that the exhaust gas temperature sensor is abnormal. | 03-25-2010 |
20100089138 | Portable Emissions Measurement Adapter Device - A portable emissions measurement adapter device (PEMAD) for a vehicle exhaust system having an first exhaust pipe coupled to a second exhaust pipe defining an air inlet opening therebetween, includes an elongated tube having a first and a second end and adapted to fit through the second exhaust pipe to sealingly mate with the first exhaust pipe at the first end. The second end is adapted for operative connection to an emissions testing unit. No modification of the production vehicle is required to use the PEMAD. | 04-15-2010 |
20100326177 | Method and Arrangment for Fully Automatic Function Checking of Internal Combustion Engines - The invention relates to a method or an arrangement for function checking of internal combustion engines in motor vehicles, in which an external testing and measuring system is connected via a diagnostic interface to an on-board diagnostic and control system, and after the start of the testing process, the testing system triggers control signals to adjust the defined operating conditions of the internal combustion engine, and performs and documents analyses. To ensure an automatic testing process, it is proposed to launch a safety routine in the diagnostic and control system that interrupts the automatic testing process when certain signals are present from on-board control and/or operating devices. | 12-30-2010 |
20130000396 | SYSTEM AND METHOD FOR QUANTIFYING THE PRESENCE OF COMPONENTS IN THE EXHAUST OF COMMERCIAL AND/OR HEAVY-DUTY VEHICLES - A system and/or method for quantifying the presence of one or more components in vehicle exhaust, and more particularly to a non-contact, extractive sampling system and method for quantifying the presence of one or more components in exhaust emissions of commercial and/or heavy-duty vehicles that emit exhaust at an elevated level, under actual operating conditions. | 01-03-2013 |
20130031967 | EXHAUST SENSOR - An exhaust sensor ( | 02-07-2013 |
20130074590 | Method For Determining The State Of A Reducing Agent In A Reducing Agent Tank - A method for determining the state of a reducing agent in a reducing agent tank. The reducing agent is used for exhaust gas after-treatment of exhaust gas generated by an internal combustion engine. To inform the control unit of an internal combustion engine regarding the quality of the reducing agent in the reducing agent tank the method includes determining and recording the filling and extracting volumes of the reducing agent from the reducing agent tank by a fill level sensor, determining and recording the temperature of the reducing agent in the reducing agent tank by at least one temperature sensor over the entire service life of the exhaust gas after-treatment unit, determining and recording the distribution velocity of ultrasonic waves in the reducing agent by an ultrasonic transmitter and ultrasonic receiver, determining the state of a reducing agent from the parameters. | 03-28-2013 |
20130104637 | EXHAUST TREATMENT METHODS AND SYSTEMS | 05-02-2013 |
20130104638 | NOx SENSOR DIAGNOSIS DEVICE AND SELECTIVE CATALYTIC REDUCTION SYSTEM | 05-02-2013 |
20130118244 | Exhaust Gas Analysis System and Program for this System - The exhaust gas analysis system urges a user to conduct a purge in an exhaust gas flow line by not only informing the user of the timing that the purge is necessary from the exhaust gas analysis system but also making it easy for the user to recognize the information. The exhaust gas analysis system comprises an exhaust gas flow line (L) where an exhaust gas flows, a measurement device | 05-16-2013 |
20140102187 | HYBRID DIESEL ELECTRIC POWERTRAINS AND EMISSIONS TESTING THEREOF - Diesel electric hybrid powertrains and methods of operating and testing such powertrains are disclosed. Certain exemplary embodiments comprise test and certification methods in which a controller operates a diesel engine alone, an integrated motor/generator alone, or both the diesel engine and the motor/generator to provide brake torque at a common output shaft according to predetermined duty cycle criteria. Emissions are measured based upon criteria accounting for the effects of regenerative braking, engine shut off, and other operational modes unique to hybrid powertrains. Further exemplary embodiments comprise hybrid powertrain systems and methods of operating the same meeting performance and emissions requirements including respective limits on NOx, hydrocarbon, particulate matter, CO, and CO | 04-17-2014 |
20140157881 | PARTICULATE MATTER SENSOR - A diesel particulate filter (“DPF”) including vertically and horizontally stacked cells in which all of vertical and horizontal sides are surrounded by walls formed of a porous material, and sealing end faces of the cells alternately vertically and horizontally are provided with first and second electrodes. In a particulate matter (“PM”) sensor in which a PM deposit quantity of the DPF is detected by a capacitance of a capacitor formed by the first and second electrodes, among open cells, the first electrodes are inserted into the open cells arranged in a line in a diagonal direction, and the second electrodes are inserted into the open cells arranged in a line in the diagonal direction and including the open cells secondarily adjacent to each of the open cells into which the first electrodes are inserted. | 06-12-2014 |
20140250992 | INTERNAL COMBUSTION ENGINE TEST SYSTEM AND COMPUTER PROGRAM - It is intended to display a schematic diagram of substantially the whole of an internal combustion engine test system on a screen and a color, brightness, pattern or shape of a symbol representing a test device shown in the schematic diagram are changed according to a degree of operation safety of the test device, whereby a user is allowed to intuitively recognize a situation relating to the safety of the entire system at a glance. | 09-11-2014 |
20140290347 | SENSOR CONTROL APPARATUS, SENSOR CONTROL SYSTEM, AND SENSOR CONTROL METHOD - A sensor control apparatus which receives from a gas sensor ( | 10-02-2014 |
20140305198 | Selective Catalytic Reduction Outlet Mixing Device - Accurate measurement of exhaust gas compounds is necessary for correct operation of exhaust treatment systems, such as Selective Catalytic Reduction (SCR) units used in diesel engines. However, accurate sensor readings assume an even distribution of compounds in an exhaust stream in order to use a sampled measurement to be extrapolated to the compound concentrations in the full stream. A structure placed in an exhaust passage downstream of an SCR reaction unit causes turbulence in the exhaust gas while developing a minimal backpressure. This turbulence helps create a more uniform distribution of compounds in the exhaust. As a result, an exhaust gas sensor gives more accurate readings even when the sensor is placed in relatively close proximity to an output of the SCR system. | 10-16-2014 |
20140318228 | TEMPERATURE SENSOR - A temperature sensor ( | 10-30-2014 |
20150013441 | NOx SENSOR CONTROL DEVICE - For a predetermined period prior to detecting sensor output of a single-cell type NOx sensor, a state is induced in which a voltage is not applied between a pair of electrodes or a state in which a potential difference between the electrodes is less than a reference value. The “reference value” for the potential difference between the electrodes can be appropriately set within a range that is at least less than the aforementioned voltage for detecting the output, and is 0 V or a small potential difference in the vicinity of 0 V. Thus, a certain amount of NOx is caused to accumulate on the electrodes of the NOx sensor. After the predetermined period has elapsed, a voltage for sensor output detection is applied between the electrodes. The NOx concentration is detected according to the sensor output at a time that the voltage for sensor output detection is applied. | 01-15-2015 |
20150013442 | METHOD AND CONTROL UNIT FOR DETERMINING A DEAD TIME OF AN EXHAUST GAS SENSOR OF AN INTERNAL COMBUSTION ENGINE - In a method for determining a dead time in the response characteristic of an exhaust gas sensor in order to determine an exhaust gas state quantity in an exhaust gas duct of an internal combustion engine, the dead time is determined from a measured output signal of the exhaust gas sensor and a comparison signal. An undelayed comparison signal is determined, and a cross-correlation is formed between the measured output signal and the comparison signal delayed by a model dead time selected in such a way that the cross-correlation function assumes a maximum, and the dead time of the measured output signal is set equal to the selected model dead time. | 01-15-2015 |
20150059457 | Aftertreatment Module with Sensor Mounting Arrangement - An aftertreatment module includes a conduit defining a flow path and an aperture into the flow path. A shield is arranged at least partway around the conduit and spaced therefrom, the shield including an opening in registration with the aperture. A boss is provided on the conduit, the boss having a through-hole in registration with the aperture. A sensor is disposed within the boss so as to extend at least partway into the flow path. A spacer is arranged around the boss. The sensor extends through the opening, and the shield further includes an inner portion for engagement with the spacer. | 03-05-2015 |
20150075269 | CONTAMINANT MEASUREMENT FOR SENSOR ELEMENT POISONOUS EXHAUST ENVIRONMENT - A sensor according to embodiments of the present invention is protected or shielded from exhaust gas under the conditions applying when no measurement is necessary. In embodiments the shield can be a flow of clean air or any other suitable protection gas shield. The present invention provides a sensor wherein close to the sensor in the exhaust system that requires protection as well as calibration, a means for providing a shielding gas is placed adjacent to the sensor element, the means for providing shielding gas being adapted to flow shielding gas over the sensing element when in virtual mode and/or calibration gas in calibration mode so that exhaust gas can not reach the sensor. For example a gas nozzle can be installed blowing a gas such as air over the sensing element when in virtual mode or in calibration mode so that exhaust gas cannot reach the sensor. The sensor and the sensing element in any of the embodiments may be adapted to measure the concentration of NOX, oxygen or NH3. | 03-19-2015 |
20150122002 | APPARATUS FOR MEASURING OF CONTENTS IN EXHAUST GASES | 05-07-2015 |
20150316447 | VERIFICATION SYSTEM - A verification system includes a reference gas supply part that supplies reference gas in place of exhaust gas and is configured to be able to verify the consistency between a supply amount of the reference gas from the reference gas supply part and a measured value of the reference gas measured by an analyzer. The verification system further includes a control part that receives a setting flow rate signal that is a signal indicating a setting flow rate and an analysis range signal that is a signal indicating an analysis range of the analyzer, calculates a target supply amount of the reference gas on the basis of the setting flow rate and the analysis range indicated by the respective signals, and controls the reference gas supply part so as to make the reference gas supply amount by the reference gas supply part equal to the target supply amount. | 11-05-2015 |
20150369785 | SENSOR DEVICE FOR DETECTING A MOISTURE CONTENT OF A FLOWING FLUID MEDIUM - A sensor device includes a moisture module that includes a sensor element for detecting moisture of a fluid medium flowing in a flow direction and a protective membrane screening the sensor element. The sensor device includes a housing, in a measuring chamber of which the moisture module is at least partially situated, and that includes a protective tube extending into the flowing fluid medium in an axial direction perpendicular to the flow direction, the protective tube is designed for flow of the fluid medium into at least one inlet opening, through an inflow path, into the measuring chamber counter to the axial direction, and out of the measuring chamber via an outflow path in the axial direction and an outlet opening, where, with respect to a direction of gravity, the openings are at a bottom of the protective tube. | 12-24-2015 |
20160018290 | INTERNAL COMBUSTION ENGINE - An internal combustion engine includes at least one cylinder, at least one feed conduit for combustion gas, and at least one exhaust gas conduit for carrying exhaust gas away from the internal combustion engine. A measuring device determines the gas quality of a combustion gas which can be fed to the internal combustion engine by the feed conduit. The measuring device includes at least one catalyst unit to which exhaust gas from the internal combustion engine can be fed, and at least one sensor downstream of the catalyst unit for detecting a parameter which is characteristic of the conversion rate of the catalyst unit. The gas quality of the combustion gas fed to the internal combustion engine can be determined by the measuring device for determining the gas quality depending on the parameter which is ascertained by the sensor. | 01-21-2016 |
20160047718 | EXHAUST GAS MEASURING INFORMATION PROCESSING APPARATUS, EXHAUST GAS MEASURING SYSTEM, AND RECORDING MEDIUM - An exhaust gas measuring information processing apparatus of the present invention detects troubles etc. of a flow sensor during a flow rate measurement and performs predetermined processing relevant to maintenance and check of the flow sensor. The exhaust gas measuring information processing apparatus includes a reception circuit that receives a flow rate measurement signal indicating a flow rate measurement value of exhaust gas flowing through an exhaust gas tube of an internal combustion engine and an operational state signal indicating an operational state of the internal combustion engine, and a processing executing circuit that executes predetermined processing relevant to maintenance and check of the flow sensor that outputs the flow rate measurement signal when a predetermined correlation is not satisfied between an index value for the operational state indicated by the operational state signal and the flow rate measurement value indicated by the flow rate measurement signal. | 02-18-2016 |
20160091472 | CO2-CONCENTRATION SENSOR FOR INTERIOR USE - A sensor arrangement for determining the CO | 03-31-2016 |
20190145858 | FINE-PARTICLE NUMBER DETECTOR | 05-16-2019 |
073114720 | For air/fuel ratio | 25 |
20080196489 | DIAGNOSTIC METHOD AND CONTROL APPARATUS FOR GAS SENSOR - A gas sensor diagnostic method (or apparatus) is arranged to periodically obtain sensor output values of a gas sensor such as an oxygen sensor for an internal combustion engine, and to determine local extreme values from the sensor output values obtained during a period of interruption of fuel supply to the engine. Moreover, the local extreme values are compared with a first predetermined threshold level. When the number of the local extreme values reaches a predetermined first number, a diagnosis is performed to determine whether the gas sensor is in an improper condition or not, in accordance with results of the comparison of the local extreme values with the first threshold level. | 08-21-2008 |
20080196490 | DIAGNOSTIC METHOD AND APPARATUS FOR GAS SENSOR - A gas sensor diagnostic method includes the steps of counting the reversal number of times that a target air-fuel ratio for an air-fuel mixture to be supplied to an internal combustion engine reverses from a rich side to a lean side or from the lean side to the rich side through a specific air-fuel ratio defined as a boundary of the rich and lean sides; obtaining a detection signal of a gas sensor at constant time intervals during a diagnosis period between a timing when the count for the reversal number is started and a timing when the reversal number reaches a predetermined number; calculating a moderated signal by applying a moderation calculation using a predetermined moderation coefficient to the obtained detection signal; calculating a deviation between the obtained detection signal and the calculated moderated signal; and determining whether the gas sensor is in an abnormal state or not on the basis of the deviation. | 08-21-2008 |
20090084172 | Diagnostic method and apparatus for gas sensor - A gas sensor diagnostic method includes the steps of counting the reversal number of times that a target air-fuel ratio for an air-fuel mixture to be supplied to an internal combustion engine reverses from a rich side to a lean side or from the lean side to the rich side through a specific air-fuel ratio defined as a boundary of the rich and lean sides; obtaining a detection signal of gas sensor at constant time intervals during a diagnosis period between a timing when the count for the reversal number is started and a timing when the reversal number reaches a predetermined number; calculating a first moderated signal by applying a first moderation calculation to the detection signal, and a second moderated signal by applying a second moderation calculation to the detection signal; calculating a deviation between the first and second moderated signals; and determining whether the gas sensor is in the abnormal state on the basis of the deviation obtained during the diagnosis period. | 04-02-2009 |
20090100922 | METHOD AND CONTROL APPARATUS FOR EVALUATING AN EXHAUST GAS PROBE - In a method and a control apparatus for monitoring an exhaust gas probe, the exhaust gas probe is arranged in an exhaust gas channel. The exhaust gas channel is connected to an internal combustion engine, with the internal combustion engine being supplied with a rich or lean air/fuel ratio in an oscillating fashion. An amplitude of a signal based on the oscillating output signal of the exhaust gas probe is determined and used to evaluate the exhaust gas probe. | 04-23-2009 |
20090211350 | APPARATUS AND METHOD FOR DETECTING ABNORMALITY OF INTER-CYLINDER AIR-FUEL RATIO DISPERSION IN MULTI-CYLINDER INTERNAL COMBUSTION ENGINE - An apparatus or a method for detecting an abnormality of inter-cylinder air-fuel ratio dispersion in a multi-cylinder internal combustion engine according to the invention is equipped with a catalytic element that purifies exhaust gas of hydrogen, a first air-fuel ratio sensor that detects an air-fuel ratio of exhaust gas that has not passed through the catalytic element, a second air-fuel ratio sensor that detects an air-fuel ratio of exhaust gas that has passed through the catalytic element, a device that detects an abnormality of inter-cylinder air-fuel ratio dispersion on the basis of a divergence state of a detected value of a second air-fuel ratio to a lean side from a detected value of a first air-fuel ratio, and a device that forcibly reduces fuel injection amounts in cylinders individually when an abnormality on dispersion is detected by the abnormality detector, detects a divergence state of the detected value of the second air-fuel ratio to the lean side from the detected value of the first air-fuel ratio at this time, and specifies as an abnormal cylinder that one of the cylinders in which a value indicating this divergence state has become smaller than at a time of detection of the abnormality of dispersion. | 08-27-2009 |
20100037683 | Method and device for monitoring an exhaust gas probe - In relation to a jump (SP_J_LR) from a lean air-to-fuel ratio to a richer air-to-fuel ratio, a measurement signal of the exhaust gas probe is detected after a predetermined lean-to-rich delay (t_R) as a lean-to-rich signal value (SV_LR) and is placed in relation to a lean-to-reference signal value (L_REF). In relation to a jump (SP_J_RL) from a richer air-to-fuel ratio to a leaner air-to-fuel ratio, the procedure is performed equivalently. Depending on the lean-to-rich and lean-to-rich signal value put in relation, either an asymmetrically aged or non-asymmetrically aged exhaust gas probe is detected. | 02-18-2010 |
20100083743 | PROCEDURE AND DEVICE FOR DIAGNOSING AN EXHAUST GAS PROBE - The invention relates to a procedure and a device for diagnosing the increasing speed and the dead time of an exhaust gas probe, which is arranged in the exhaust gas duct of a combustion engine, whereby the diagnosis is carried out due to a comparison of a modeled and a measured signal after a default change of a fuel air ratio of an air fuel mixture that is supplied to the combustion engine and whereby the signal is an output signal of the exhaust gas probe or a modeled or measured signal that is derived from the output signal. It is thereby provided that a first extreme value is determined in the course of the modeled signal and that a first point of time and a first starting value are determined if the modeled signal deviates by a default amount from the first extreme value, that a second extreme value in the course of the measured signal is determined and that a second point of time and a second starting value are determined, if the measured signal deviates from the second extreme value by a pre-determined amount, that a first integral is created over a pre-determined period of time, beginning at the first point of time above the different between the first starting value and the modeled signal and that a second integral is created over a second period of time, beginning at the second point of time, above the difference between the second starting value and the measured signal, that the second period of time is equal to the pre-determined period of time or that the end of the second period of time related to the point of time of the change of the fuel air ratio or related to a first point of time is determined and that from a quantitative comparison between the first integral and the second integral a quantitative comparative value is created, which indicates the increasing speed and/or the dead time of the exhaust gas probe. The procedure and the device enable a secure diagnosis of the increasing speed and the dead time of exhaust gas probes in the exhaust gas of combustion engines depending on the changing direction of the fuel air ratio that is supplied to the combustion engine. | 04-08-2010 |
20100162806 | Detection of cylinder-to-cylinder air/fuel imbalance - An air/fuel imbalance detection module includes a fueling control module, a response time determination module, and a comparison module. The fueling control module commands a fueling change according to a predetermined fueling pattern. The response time determination module determines a measured response time for a wide-range air/fuel sensor (WRAF) to output a predetermined voltage. The comparison module compares the measured response time with a reference time range and diagnoses air/fuel imbalance when the measured response time is outside the reference time range. | 07-01-2010 |
20100186491 | ABNORMALITY DIAGNOSIS DEVICE FOR AIR-FUEL RATIO SENSOR - An abnormality diagnosis device according to the present invention can calculate a calculation air-fuel ratio A/Fk based upon a fuel injection quantity and an intake air quantity, and determine the abnormality of the air-fuel ratio sensor based upon the calculation air-fuel ratio and an actual air-fuel ratio detected by an air-fuel ratio sensor, when an operating condition in the internal combustion engine relatively rapidly changes according to an engine operating demand and thereby the calculation air-fuel ratio relatively rapidly changes. Since the air-fuel ratio is not forcibly changed and fluctuated, deterioration of the exhaust emission and the combustion state, and deterioration of the vibration and the noise at abnormality diagnosing can be certainly prevented. | 07-29-2010 |
20110113870 | METHOD AND DEVICE FOR DETECTING ABNORMALITY OF ENGINE - This disclosure provides a method of detecting a cylinder-to-cylinder gap abnormality of an air fuel ratio with sufficient accuracy according to an individual specificity of an air fuel ratio detecting module. Particularly, the method may be used for an engine to detect the cylinder-to-cylinder gap abnormality of the air fuel ratio of supplied air fuel mixture abnormality based on an output value of a linear O | 05-19-2011 |
20110113871 | METHOD AND DEVICE FOR MEASURING OUTPUT CHARACTERISTIC OF AIR FUEL RATIO DETECTING MODULE - This disclosure provides a method for measuring an output characteristic of an air fuel ratio sensor based on an output value of the air fuel ratio sensor at the time of changing a fuel injection amount. Under a predetermined condition, an increase in the fuel injection amount is started from a particular cylinder and the increase in the fuel injection amount is continued for a given time period, or a decrease in the fuel injection amount is started from the particular cylinder and the decrease in the fuel injection amount is continued for the given time period. Therefore, the output characteristic of the air fuel ratio detecting module can be measured with sufficient accuracy, regardless of the contacting strength of emission gas for every cylinder against the air fuel ratio detecting module. | 05-19-2011 |
20110219861 | ABNORMALITY DIAGNOSTIC DEVICE OF INTERNAL COMBUSTION ENGINE WITH TURBOCHARGER - When a wastegate valve, which opens and closes an exhaust bypass passage bypassing an exhaust turbine, is open, exhaust gases of respective cylinders bypass the exhaust turbine and pass a sensing point of an air-fuel ratio sensor downstream of the exhaust turbine. Accordingly, the exhaust gases of the respective cylinders can be avoided from being mixed by the exhaust turbine, so an influence of an inter-cylinder variation in an air-fuel ratio due to an inter-cylinder imbalance abnormality becomes apt to appear in an output waveform of the air-fuel ratio sensor. Therefore, existence or nonexistence of the inter-cylinder imbalance abnormality is determined based on the output of the air-fuel ratio sensor when the wastegate valve is open. Eventually, the existence or nonexistence of the inter-cylinder imbalance abnormality can be determined accurately, thereby improving detection accuracy of the inter-cylinder imbalance abnormality. | 09-15-2011 |
20120125090 | METHOD AND SYSTEM TO DIAGNOSE EXHAUST GAS SENSOR DETERIORATION - In a method and system to diagnose exhaust gas sensor deterioration, an automobile includes an exhaust gas system. The exhaust gas system has a fuel delivery system, an engine, a catalytic converter, an exhaust gas sensor, a processor, and/or a memory. The fuel delivery system supplies fuel which is combined with air to form a mixture combusted by the engine to generate exhaust. The processor controls the air-fuel ratio of the mixture based on the air-fuel ratio data of the exhaust detected by the exhaust gas sensor. The catalytic converter reduces pollutants in the exhaust. The processor analyzes the air-fuel ratio data to determine one or more time constants of a step response for rich to lean fuel operations and/or lean to rich fuel operations. The processor compares the time constants to a predetermined time constant threshold to determine if the exhaust gas sensor has malfunctioned. | 05-24-2012 |
20120160022 | APPARATUS FOR DETERMINING AN AIR-FUEL RATIO IMBALANCE AMONG CYLINDERS OF AN INTERNAL COMBUSTION ENGINE - An air-fuel ratio imbalance among cylinders determining apparatus according to the present invention is applied to a multi-cylinder internal combustion engine in which a compression ratio is variable. The determining apparatus obtains, using at least an output value of an upstream air-fuel ratio sensor disposed for a catalyst, an “imbalance determining parameter” which becomes larger as a degree of an imbalance among “individual cylinder air-fuel ratios” becomes larger, each of the individual cylinder air-fuel ratios being an air-fuel ratio of a mixture supplied to each of cylinders. Further, the determining apparatus determines that an air-fuel ratio imbalance state among cylinders is occurring, when the imbalance determining parameter is larger than a predetermined threshold. The determining apparatus changes the predetermined threshold in accordance with a mechanical compression ratio of the engine. | 06-28-2012 |
20120192634 | ABNORMALITY DETERMINATION DEVICE FOR AIR-FUEL RATIO SENSOR - An abnormality determination device for an air-fuel ratio sensor includes a differential value calculator and an abnormality determiner. The differential value calculator is configured to calculate a differential value of an output value of the air-fuel ratio sensor which is configured to detect an air-fuel ratio of exhaust gas. The abnormality determiner is configured to determine abnormality of the air-fuel ratio sensor based on a result of comparison between a reference output value of the air-fuel ratio sensor and a predetermined threshold. The reference output value is obtained by the air-fuel ratio sensor when the differential value calculated by the differential value calculator becomes a predetermined value. | 08-02-2012 |
20120234085 | AIR-FUEL RATIO ESTIMATING/DETECTING DEVICE - An air-fuel ratio estimating device can include an amount of fuel injected calculating unit which can estimate the amount of fuel injected GF for each cycle on the basis of a driving time Tout of a fuel injection valve. A proportional constant calculating section determines a proportional constant K, using the estimated charging efficiency CE and the amount of fuel injected Gf, when the output value of a sensor is in a transition region R. When the sensor output value is not in the transition region R, an air-fuel ratio A/F is estimated from the determined proportional constant K, a charging efficiency CE calculated by a calculating section, and the amount of fuel injected Gf. | 09-20-2012 |
20130118245 | APPARATUS AND METHOD FOR DETECTING ABNORMAL AIR-FUEL RATIO VARIATION BETWEEN CYLINDERS - An apparatus and method for detecting an abnormal air-fuel ratio variation between cylinders of a multi-cylinder internal combustion engine in which the output of an air-fuel ratio sensor is acquired at each sampling interval, a parameter correlated with the degree of fluctuation of the sensor output is calculated from a plurality of the acquired sensor outputs, and the presence or absence of the abnormal air-fuel ratio variation between cylinders is determined by comparing the parameter with a determination value. A cylinder air amount is estimated at each sampling interval. Every time the air-fuel ratio sensor output is acquired, the value of the cylinder air amount at the point earlier, by a transport delay time, than the point of the acquisition is determined based on the time-series data, and a corresponding determination value corresponding thereto is calculated. The determination value is determined based on a plurality of the calculated corresponding determination values. | 05-16-2013 |
20130213124 | METHOD TO DETERMINE PERFORMANCE CHARACTERISTIC OF AN ENGINE EXHAUST SYSTEM - A method to determine a performance characteristic of an exhaust system of an engine, where the exhaust system includes an exhaust gas sensor that outputs an exhaust gas signal. A combustion event in a cylinder is fueled at an air-fuel ratio selected to produce exhaust gas that is expected to be distinguishable by the exhaust gas sensor from exhaust gas produced by other combustion events, and used to determine the performance characteristic. The performance characteristic may be an exhaust gas transport time of the exhaust system, a sensitivity characteristic of the exhaust gas sensor, or a fueling correction value necessary to restore fueling to, for example, stoichiometry. Such a method is useful to detect physical changes in the exhaust system such as relocating the exhaust gas sensor, or detect if the exhaust gas sensor is damaged or not operating properly. | 08-22-2013 |
20140130588 | Oxygen Sensing Method and Apparatus - A method of determining an air:fuel ratio of a combustion process based on information from an oxygen sensor exposed to exhaust gases of the combustion process. A first value is determined indicative of the exhaust gas oxygen content, with the value being based on a resistance of an oxygen sensing portion of the oxygen sensor. A second value is determined indicative of a temperature of the oxygen sensor, which may be based on a resistance of a heater portion of the oxygen sensor. A third value is determined indicative of the air:fuel ratio as a function of the first and second values. Thus, the oxygen level data from the oxygen sensor may be temperature compensated so as to result in a more accurate estimate of the air:fuel ratio. The third value may then be used to control the combustion process, which may be associated with an internal combustion engine. | 05-15-2014 |
20150090019 | CATALYST DETERIORATION JUDGING SYSTEM - The deterioration judgment for an absorption reduction type NOx catalyst ( | 04-02-2015 |
20150107346 | INTER-CYLINDER AIR-FUEL RATIO VARIATION ABNORMALITY DETECTION APPARATUS - An apparatus includes an air-fuel ratio sensor installed in an exhaust passage common to a plurality of cylinders in a multicylinder internal combustion engine, and a control apparatus configured to detect an inter-cylinder air-fuel ratio variation abnormality based on a parameter correlated with a degree of variation in output from the air-fuel ratio sensor. The control apparatus is configured to calculate a division crank angle that bisects an area of a region present in at least one of a rich and a lean sides with respect to a mean value of an output waveform from the air-fuel ratio sensor during one cycle of the internal combustion engine or such a predetermined constant value as corresponds to a center of fluctuation in the output waveform and to identify an abnormal cylinder with a deviation of the air-fuel ratio based on the division crank angle. | 04-23-2015 |
20150114102 | GAS SENSOR ELEMENT, GAS SENSOR, AND METHOD OF MANUFACTURING GAS SENSOR ELEMENT - A gas sensor element in an air/fuel ratio sensor includes an element body and a protection layer having two layers (a first layer and a second layer). The gas sensor element has at least one separation portion in the form of a space between the first layer and the second layer. The gas sensor element can temporarily accumulate, in the at least one separation portion, water which adheres to the surface of the protection layer and penetrates into the protection layer. Thus, as compared with a protection layer which is identical in thickness to the protection layer, but does not have separation portions, water adhering to the protection layer is less likely to reach the element body. Therefore, there can be restrained breakage of an end of the element body which could otherwise result from thermal shock stemming from adhesion of water. | 04-30-2015 |
20150122003 | ABNORMALITY DIAGNOSIS DEVICE FOR EXHAUST GAS SENSOR - An abnormality diagnosis device is for an exhaust gas sensor that detects an air-fuel ratio, or a rich or lean state of exhaust gas from an internal combustion engine and that includes a sensor element having a catalyst layer. The device includes an abnormality diagnosis unit that makes a sensor abnormality diagnosis whereby to change the air-fuel ratio alternately between a rich side and a lean side and to determine whether the exhaust gas sensor is abnormal or not based on response characteristics of the exhaust gas sensor in response to the change of the air-fuel ratio. When making the sensor abnormality diagnosis, the abnormality diagnosis unit calculates the response characteristics of the exhaust gas sensor with exclusion of a sensor output plateau region, which is a region in which an output of the exhaust gas sensor is stagnant due to the catalyst layer. | 05-07-2015 |
20150292983 | Method for Detecting Fuel Discharge From the Oil - A method is provided for detecting fuel discharge from a lubricant in a housing of an internal combustion engine. A first lambda deviation is measured by a lambda sensor for a first mass air flow supplied in an intake tract of the engine. A second lambda deviation is measured by the lambda sensor for a second mass air flow that differs from the first mass air flow, and is supplied in an intake tract of the engine. An actual comparative value is calculated from the measured first and second lambda deviations. A desired comparative value indicative of the fuel discharge is calculated from a first desired lambda deviation for the first mass air flow, and a second desired lambda deviation is calculated for the second mass air flow. The fuel discharge is detected based on a comparison of the actual comparative value and the desired comparative value. | 10-15-2015 |
20160102594 | INTEGRATED FUEL CATALYST MONITOR - A method is provided for monitoring an emission control device coupled to an engine. In one example approach, the method comprises, following a deceleration fuel shut-off (DFSO) duration, indicating degradation of an emission device based on an amount of rich products required to cause a sensor to become richer than a first threshold, the indicating carried out when DFSO duration is greater than a second threshold. The method also comprises an integration which is based on inlet air-fuel ratio, the integration starting only after a pre-catalyst sensor reaches stoichiometry. | 04-14-2016 |
073114730 | With oxygen sensor | 16 |
20090145212 | Sensor with quick connector - A fuel injection system includes a fuel tank, a supply line, a fuel injection rail and a number of fuel injectors. The fuel tank includes a fuel tank module which houses a fuel pump. The fuel pressure within the fuel injection system is monitored by a pressure sensor which is integrated into a quick connector between the fuel supply line and the fuel tank module. | 06-11-2009 |
20090151437 | Exhaust gas oxygen sensor monitoring - An internal combustion engine includes an exhaust system, an oxygen sensor in the exhaust system and a sensor malfunction monitor. The sensor malfunction monitor measures a rate of change of a signal from the sensor on detecting a turning point of the signal and detects a malfunction when a rate of change of the signal exceeds a threshold. | 06-18-2009 |
20090260429 | PROCEDURE AND DEVICE FOR DIAGNOSING THE DYNAMIC OF AN EXHAUST GAS SENSOR - The invention concerns a procedure and a device for diagnosing the dynamic of an exhaust gas sensor, which is arranged in an exhaust gas duct of a combustion engine and with which a parameter of the gas mixture that is supplied to the combustion engine is regulated by a control loop. It is thereby provided according to the invention that during a diagnosing period a temporal deflection of a regulation correcting variable for the parameter that is derived from an output signal of the exhaust gas sensor or a temporal course of the output signal of the exhaust gas sensor is used for the diagnosis and that the dynamic of the exhaust gas sensor is assumed in an evaluation algorithm. Thereby an improvement of the on-board diagnosis of the dynamic of the exhaust gas sensor can be achieved and in particular lambda probes, which provide a slowing down of their responding behavior, can be detected early on. | 10-22-2009 |
20100005872 | METHOD FOR ESTIMATING THE OXYGEN CONCENTRATION IN INTERNAL COMBUSTION ENGINES - A method for estimating the oxygen concentration in an internal combustion engine that includes, but is not limited to an intake manifold, an exhaust manifold, an EGR system, a throttle valve, an air mass sensor for measuring a fresh air flow ({dot over (m)} | 01-14-2010 |
20100139379 | SENSOR - A sensor including a sensor element including a plurality of electrode terminals, terminal metal fittings, a terminal surrounding member, and lead wires connected to respective terminal metal fittings. The terminal surrounding member is divided into a front side surrounding member and a rear side surrounding member in the front-rear direction, and a rear end face of the front side surrounding member abuts a front end face of the rear side surrounding member. At least one of the terminal metal fittings includes a protruding piece portion protruding in a lateral direction and held between the rear end face of the front side surrounding member and the front end face of the rear side surrounding member. | 06-10-2010 |
20100154525 | CLOSED LOOP CONTROL WITH BIAS VOLTAGE TOGGLE - An oxygen sensor circuit comprises an oxygen sensor, a bias voltage module, and a switch module. The bias voltage module communicates with the oxygen sensor and generates a bias voltage. The switch module selectively connects the bias voltage module to the oxygen sensor. | 06-24-2010 |
20100212414 | 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 a rich-output continuation time during which output value of the oxygen sensor continues being an output value that shows a rich state before a fuel cut is started is longer than a set continuation time; 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 |
20130199283 | METHOD AND DEVICE FOR DIAGNOSING DEVIATIONS IN A SINGLE CYLINDER LAMBDA CONTROL - The invention relates to a method and device for diagnosing deviations in a single cylinder lambda control in an internal combustion engine having at least two cylinders and an exhaust gas sensor designed as a broadband lambda sensor, wherein a pump current is evaluated by means of a pump cell and said pump current is used at least temporarily for an individual cylinder lambda control. According to the invention, a pump voltage or a pump voltage change is determined via the pump cell in addition to the pump current and said value is transmitted to a diagnosis apparatus. Deviations in the single cylinder lambda control can thus be better diagnosed without additional material expense according to the invention, which provides advantages in particular in respect of tightened rulemaking in on-board diagnosis. A preferred application of the method is the use in internal combustion engines having multi-bank exhaust systems. | 08-08-2013 |
20130263652 | METHOD FOR DETECTING THE OPERATIONAL READINESS OF A JUMP LAMBDA SENSOR - In a method for detecting the operational readiness of a jump lambda sensor associated with an internal combustion engine the internal resistance of the sensor is determined as the criterion for the operational readiness of the sensor. The internal resistance is measured by applying a pulsed current to the sensor, the frequency of the current being selected as a function of the state of the sensor ( | 10-10-2013 |
20140033812 | SYSTEM AND METHOD FOR DIAGNOSING A FAULT IN AN OXYGEN SENSOR BASED ON ENGINE SPEED - A system according to the principles of the present disclosure includes an error count module and a sensor diagnostic module. The error count module increases an error count when an actual air/fuel ratio is different from a desired air/fuel ratio and selectively adjusts the error count based on an actual engine speed. An oxygen sensor generates a signal indicating the actual air/fuel ratio. The sensor diagnostic module diagnoses a fault in the oxygen sensor when the error count is greater than a first predetermined count. | 02-06-2014 |
20140047912 | OXYGEN SENSOR REGENERATION - Methods and systems for heating an oxygen sensor. One system includes an oxygen sensor and controller. The oxygen sensor includes a heater and an electro-chemical measurement cell and a heater. The controller is coupled to the oxygen sensor and is configured to, for each of a plurality of stages of a regeneration process, determine a predetermined temperature for heating the oxygen sensor to, determine a predetermined internal resistance value of an electro-chemical measurement cell of the oxygen sensor associated with the predetermined temperature, apply a pulse-width-modulated signal to the heater, and monitor an internal resistance of the measurement cell while applying the pulse-width-modulated signal to the heater to determine when the internal resistance of the measurement cell reaches the predetermined internal resistance. | 02-20-2014 |
20140130589 | METHOD AND DEVICE FOR OPERATING A SENSOR FOR DETERMINING EXHAUST GAS COMPONENTS, IN PARTICULAR FOR A MOTOR VEHICLE - A method and a device for operating a sensor is provided in an exhaust gas system of an internal combustion engine for determining the emissions contained in an exhaust gas flow, in particular, of nitrogen oxides, ammonia, oxygen and/or unburnt carbon, with the exhaust gas flow acting on the sensor during measurement phases. Between the measurement phases, the sensor is at least largely kept free from the exhaust gas flow, wherein the duration and/or the frequency of the measurement phases can be set as a function of operating parameters of the internal combustion engine and/or of the exhaust gas regulation system. A measurement space which surrounds the sensor is exposed to a pressurized flushing gas immediately after a measurement phase, as a result of which the exhaust gas present in the measurement space is displaced out of the measurement space into the exhaust gas flow. | 05-15-2014 |
20150047424 | STATIC AND DYNAMIC PRESSURE COMPENSATION FOR INTAKE OXYGEN SENSING - An oxygen sensor pressure compensation system includes a static pressure compensation module to receive an oxygen sensor signal from an oxygen sensor and a pressure signal from a pressure sensor and to perform static pressure compensation. A dynamic pressure compensation module receives the oxygen sensor signal and the pressure signal and to perform dynamic pressure compensation. A summing module generates a compensated oxygen signal based on the static pressure compensation and the dynamic pressure compensation. | 02-19-2015 |
20160011077 | METHOD AND DEVICE FOR DETERMINING THE LAMBDA VALUE WITH A BROADBAND LAMBDA SENSOR OF AN INTERNAT COMBUSTION ENGINE, PARTICULARLY OF A MOTOR VEHICLE | 01-14-2016 |
20160032812 | METHOD AND SYSTEM FOR DETECTING FAULT OF REAR OXYGEN SENSOR - A method for detecting a fault of a rear oxygen sensor installed on an exhaust pipe of a vehicle may include determining whether the rear oxygen sensor satisfies a diagnosis entry condition, comparing an output voltage of the rear oxygen sensor to a preset fault determination voltage range so as to determine whether the output voltage of the rear oxygen sensor is included in the fault determination voltage range, changing the duty of a heater of the rear oxygen sensor when the output voltage of the rear oxygen sensor is not included in the fault determination voltage range, determining whether the output voltage of the rear oxygen sensor, controlled by changing the heater duty, is included in the fault determination voltage range, and confirming that the rear oxygen sensor has a fault, when the output voltage of the rear oxygen sensor is included in the fault determination voltage range. | 02-04-2016 |
20160201588 | UNIVERSAL CONTROL AND EVALUATION UNIT PARTICULARLY FOR OPERATION OF A LAMBDA PROBE | 07-14-2016 |