Patents
Sitemap › F01 - Machines or engines in general; Engine plants in general; Steam engines › F01N - Gas-flow silencers or exhaust apparatus for machines or engines in general; Gas-flow silencers or exhaust apparatus for internal-combustion engines › F01N 11 - Monitoring or diagnostic devices for exhaust-gas treatment apparatus
Patents for F01N 11 - Monitoring or diagnostic devices for exhaust-gas treatment apparatus (7,022)
07/1999
07/13/1999US5921077 Method of monitoring a secondary air pump
06/1999
06/30/1999EP0926321A2 Deterioration determination apparatus for exhaust emission control device of internal combustion engine
06/29/1999US5916294 System and method for estimating tailpipe a emissions in a vehicle
06/23/1999EP0924398A2 Exhaust gas purifier and operating method thereof
06/23/1999EP0923721A1 MONITORING SENSOR FOR NOx CATALYTIC CONVERTER
06/19/1999CA2250629A1 Exhaust gas purifier and operating method thereof
06/16/1999EP0922270A1 Process for determining and/or paying a compensation for pollutants in exhaust fumes and motor vehicle with a set working according to this process
06/10/1999DE19753842A1 Determining when to discontinue auxiliary heating of catalyst from cold start
06/02/1999DE19752965A1 External ignition IC engine exhaust-gas cleaning system monitoring method
05/1999
05/27/1999WO1999025966A1 Apparatus and method for determining catalytic converter operation
05/27/1999WO1999025965A1 VEHICULAR ON-BOARD MONITORING SYSTEM SENSING COMBINED HC/NOx EMISSIONS FOR CATALYTIC CONVERTER EVALUATION
05/27/1999DE19751895A1 Catalyst operability evaluation in exhaust fume system of combustion engine
05/26/1999EP0918147A2 Exhaust gas purifying apparatus for internal combustion engine
05/19/1999EP0916941A2 Method and apparatus for detecting a functional condition of an NOx occlusion catalyst
05/14/1999WO1999023372A2 Apparatus and method for diagnosis of catalyst performance
05/14/1999WO1999023371A1 A method of monitoring efficiency of a catalytic converter and a control system suitable for use in the method
05/14/1999WO1999023369A1 Apparatus and method for diagnosis of catalyst performance
05/11/1999US5901552 Method of adjusting the air/fuel ratio for an internal combustion engine having a catalytic converter
05/06/1999DE19848578A1 Sensor fitted to a vehicle exhaust
05/04/1999US5899062 For monitoring exhaust gas conversion efficiency of a catalytic converter
04/1999
04/27/1999US5896743 Catalyst monitor utilizing a lifetime temperature profile for determining efficiency
04/21/1999EP0909364A1 Method for monitoring the performance of a catalytic converter using post catalyst methane measurements
04/20/1999US5894727 Method and system for generating an inferred EGO signal in an asymmetrical Y-pipe exhaust system
04/14/1999EP0908608A1 Process for monitoring the operation and ageing of a catalytic converter for a lean-burn engine and system for carrying out the process
04/14/1999EP0908607A2 Method for monitoring operation of a catalytic converter
04/08/1999DE19744067A1 Building temp. model for exhaust gas region of IC engine based on operating parameters
04/01/1999WO1999000588A3 Method and apparatus for injecting hydrogen into a catalytic converter
03/1999
03/30/1999US5887421 Apparatus for detecting the deterioration of a three-way catalytic converter for an internal combustion engine
03/24/1999EP0903479A2 An exhaust gas purification device for an internal combustion engine
03/24/1999EP0903478A2 An exhaust gas purification device for an internal combustion engine
03/10/1999EP0852662B1 Process and device for reacting a pollutant in an exhaust gas on a catalyst
03/04/1999DE19839791A1 Air-fuel ratio regulation system for combustion engine
03/04/1999DE19736967A1 Method and arrangement for monitoring NOx reservoir in combustion engine esp diesel engine exhaust gas output line
03/02/1999US5877413 Sensor calibration for catalyst deterioration detection
03/02/1999US5875628 Air-fuel ratio control apparatus for internal combustion engine
02/1999
02/25/1999DE19736233A1 Vehicle catalyser test method
02/18/1999DE19733107A1 Method of checking lambda probes of IC engine
02/17/1999EP0897055A2 Optimization of the air/fuel ratio closed loop control of an internal combustion engine using a catalyst oxygen storage capacity
02/17/1999EP0897051A1 Method and device for monitoring the function of a secondary air pump
02/16/1999US5870891 Method for monitoring the supply of secondary air to the exhaust gas of an internal combustion engine
02/11/1999WO1999006681A1 Automotive on-board monitoring system for catalytic converter evaluation
02/09/1999US5869743 To analyze exhaust gas emissions from an ic engine exhaust delivery system
02/02/1999US5865027 Device for determining the abnormal degree of deterioration of a catalyst
02/02/1999US5865026 System and method for monitoring a catalytic converter using adaptable indicator threshold
01/1999
01/26/1999US5862661 Method for monitoring catalytic converter efficiency
01/20/1999EP0598785B1 Catalyst monitoring using ego sensors
01/19/1999US5860277 Method for monitoring the operating capability of a catalyzer in the exhaust duct of an internal combustion engine
01/14/1999DE19727268C1 Validation of reductant dosing unit for hot diesel exhaust gas selective catalytic reducer
01/12/1999US5857325 Electrical load abnormality-detecting system for automotive vehicles
01/07/1999WO1999000588A2 Method and apparatus for injecting hydrogen into a catalytic converter
01/07/1999DE19726791A1 Verfahren zur Überwachung der Konvertierungsrate eines Abgaskatalysators für eine Brennkraftmaschine Method for monitoring the conversion rate of an exhaust catalyst for an internal combustion engine
01/05/1999US5857163 Adaptive engine control responsive to catalyst deterioration estimation
12/1998
12/30/1998WO1998059159A1 Method for monitoring the conversion rate of an exhaust gas catalytic converter for an internal combustion engine
12/30/1998EP0887522A1 Catalyst monitor
12/29/1998US5854079 Method for detection of performance reduction of exhaust gas purification catalyst
12/29/1998US5852929 Failure detection system of exhaust secondary air supply system of internal combustion engine
12/22/1998US5851376 Catalyst degradation determination apparatus and method
12/16/1998EP0883737A1 Method for monitoring catalytic converter performance
12/15/1998US5848530 Device for detecting deterioration of catalytic converter for cleaning exhaust gases
12/15/1998US5848528 Optimization of closed-loop and post O2 fuel control by measuring catalyst oxygen storage capacity
12/15/1998US5848527 Apparatus for detecting deterioration of a three-way catalytic converter for an engine
12/08/1998US5847271 Catalytic converter efficiency monitor
12/08/1998US5845489 Abnormality detector for air-fuel ratio control system
12/08/1998US5845487 Method and device for operating an internal combustion engine with low nitrogen oxide emissions
12/02/1998EP0881367A1 Catalytic system for removing NOx from diesel engine exhaust gas
12/01/1998US5842340 Method for controlling the level of oxygen stored by a catalyst within a catalytic converter
12/01/1998US5842339 Method for monitoring the performance of a catalytic converter
11/1998
11/24/1998US5839274 Method for monitoring the performance of a catalytic converter using post catalyst methane measurements
11/18/1998EP0878709A2 Method and apparatus for measuring NOx gas concentration
11/18/1998EP0878611A2 A device for determining deterioration of a catalytic converter for an engine
11/11/1998CN1198798A process and device for reacting a pollutant in an exhaust gas on a catalyst
11/10/1998US5832721 Method and system for estimating a midbed temperature of a catalytic converter in an exhaust system having a variable length exhaust pipe
10/1998
10/29/1998WO1998048152A1 Method for monitoring the performance of a catalytic converter using post catalyst methane measurements
10/20/1998US5822982 Device for determining deterioration of a catalytic converter for an engine
10/20/1998US5822979 Catalyst monitoring using a hydrocarbon sensor
10/15/1998WO1998045586A1 PROCESS AND DEVICE FOR MONITORING A NOx ACCUMULATOR
10/15/1998DE19714715A1 Nitrous-oxide-accumulator monitoring system in exhaust-pipe
10/13/1998US5819531 Control device for electrically-heated catalyzers
10/13/1998US5819530 Internal combustion engine controller with exhaust gas purification catalyst and its deterioration monitoring system
10/08/1998WO1998044246A1 Method for monitoring the secondary mass air flow of exhaust gas cleaning equipment
10/08/1998WO1998043732A1 REDUCING NOx EMISSIONS FROM AN ENGINE BY TEMPERATURE-CONTROLLED UREA INJECTION
10/07/1998EP0869417A1 Control unit for vehicle
10/06/1998US5817521 Method for detection of performance reduction of exhaust gas purification catalyst
10/06/1998US5816231 Controller for heater of air-fuel-ratio sensor
09/1998
09/30/1998EP0867609A1 Method and system for estimating a midbed temperature of a catalytic converter in an exhaust system
09/24/1998DE19713180C1 Verfahren zur Überwachung des Sekundärluftmassenstroms einer Abgasreinigungsanlage Method for monitoring the secondary air mass flow of exhaust gas cleaning system
09/22/1998CA2137039C Fuel supply control system for internal combustion engines
09/15/1998US5806306 Deterioration monitoring apparatus for an exhaust system of an internal combustion engine
09/08/1998USRE35887 Conversion efficiency measuring apparatus of catalyst used for exhaust gas purification of internal combustion engine and the method of the same
09/08/1998US5802843 Method and apparatus for diagnosing engine exhaust gas purification system
09/03/1998WO1998038416A1 Method for controlling the level of oxygen stored by a catalyst within a catalytic converter
09/03/1998WO1998038415A1 Method for monitoring the performance of a catalytic converter
08/1998
08/25/1998US5798270 Hydrocarbon absorbing material; gas sensor; gas signal; sensor controller
08/18/1998US5795992 Method of testing durability of exhaust gas purification device
08/11/1998US5794165 Control unit for vehicle and total control system therefor
08/05/1998EP0856732A1 A limiting current sensor for detecting deterioration in a 3-way catalyst
08/05/1998EP0856645A1 Method to regulate the temperature of a catalytic converter arrangement and device for implementing the method
08/04/1998US5787705 Catalyst diagnostic
07/1998
07/28/1998US5784879 Air-fuel ratio control system for internal combustion engine
07/22/1998EP0736135B1 Catalytic converter and process for its manufacture
1 ... 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71