| Patents for F01N 11 - Monitoring or diagnostic devices for exhaust-gas treatment apparatus (7,022) |
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| 07/21/1994 | CA2152913A1 Exhaust filter backpressure indicator |
| 07/19/1994 | US5331560 Apparatus and method for self diagnosing engine component controlling systems according to predetermined levels of priority |
| 07/05/1994 | US5325664 System for determining deterioration of catalysts of internal combustion engines |
| 07/05/1994 | US5325663 Diagnostic system for a secondary air supplier in an engine |
| 06/29/1994 | EP0603222A1 Temperature measurement and/or heating device and its use in a honeycombed body, in particular a catalyzer bearing body. |
| 06/22/1994 | EP0602468A1 A device for detecting deterioration of a catalytic converter for an engine |
| 06/22/1994 | EP0602192A1 Antenna system for soot detecting apparatus |
| 06/14/1994 | US5319921 Catalytic converter efficiency monitoring |
| 06/09/1994 | DE4235225A1 Sensoranordnung zur Überwachung der Konvertierungsrate eines Abgaskatalysators Sensor system for monitoring the conversion rate of a catalytic converter |
| 06/08/1994 | EP0599875A1 An exhaust gas oxygen sensor |
| 06/07/1994 | US5317868 Method and arrangement for determining the conversion performance of a catalytic converter |
| 06/01/1994 | EP0598785A1 Catalyst monitoring using ego sensors |
| 05/26/1994 | WO1994011622A1 Catalytic converters |
| 05/24/1994 | US5313791 Method for detecting catalyst malfunctions |
| 05/17/1994 | US5311737 Exhaust purification apparatus for an engine |
| 05/11/1994 | EP0595939A1 Catalytic converter efficiency monitoring. |
| 05/05/1994 | DE4237215A1 Testing sec. air supply to IC engine exhaust system - applying lambda probe to detect variation due to supply of min. quantity of air required to overcome blocking valve |
| 05/04/1994 | EP0595044A2 A device for detecting deterioration of a catalytic converter for an engine |
| 05/03/1994 | US5307626 Method and apparatus for controlling an internal combustion engine, using the current temperature of a downstream catalytic converter |
| 04/28/1994 | WO1994009266A1 Sensor arrangement and process for monitoring the conversion rate of an exhaust gas catalyst |
| 04/27/1994 | EP0593912A1 Method for the diagnosis of the components of a heating circuit for an electrically conductive body |
| 04/27/1994 | EP0560803B1 Determination of the location of the reaction zone in a catalytic converter |
| 04/19/1994 | US5303580 Method and arrangement for determining the state of deterioration of a catalyzer |
| 04/19/1994 | US5303548 Device for determining deterioration of a catalytic converter for an engine |
| 04/14/1994 | DE4234420C1 Controlling operation of IC engine of motor vehicle - using stored characteristic addressed by engine operating point for calculating temp. of engine exhaust component |
| 04/12/1994 | US5301501 Device for determining deterioration of a catalytic converter for an engine |
| 03/31/1994 | DE4331153A1 Evaluation criteria generation for exhaust gas catalyser and lambda probe - using voltage amplitude, regulation position and/or regulation frequency to generate fault-specific evaluation criteria |
| 03/30/1994 | EP0589169A1 Device to monitor the operation of exhaust gas catalytic converters |
| 03/23/1994 | EP0588324A1 Catalyst deterioration-detecting device for internal combustion engines |
| 03/23/1994 | EP0588123A1 System for monitoring the efficiency of a catalyst, in particular for motor vehicles |
| 03/16/1994 | EP0587146A2 Method and device for determination of the loading state of particle filters |
| 03/15/1994 | US5293740 Method and arrangement for controlling the quantity of fuel for an internal combustion engine having a catalytic converter |
| 03/10/1994 | DE4328099A1 Vehicle IC engine exhaust catalyser deterioration detector - increases feedback control value for engine air=fuel ratio when catalytic converter deterioration is detected |
| 03/03/1994 | WO1994004800A1 Process for monitoring the operation of a catalytic converter |
| 03/01/1994 | US5289678 Apparatus and method of on-board catalytic converter efficiency monitoring |
| 02/24/1994 | DE4227207A1 Testing i.c. engine catalytic converter - by monitoring temp. variation during abnormal operation |
| 02/03/1994 | DE4225361A1 Functional testing of secondary air admission into IC engine exhaust - involves measuring lambda value of exhaust gases by sensor supplying electronic control unit for secondary air pump and valve |
| 02/01/1994 | US5282383 Method and apparatus for determining deterioration of three-way catalysts in double air-fuel ratio sensors system |
| 01/26/1994 | EP0545976B1 Monitoring of the catalytic activity of a catalytic converter through which a catalysable fluid flows |
| 01/26/1994 | EP0545974B1 Monitoring of the catalytic activity of a catalyst in the exhaust gas system of an internal combustion engine |
| 01/26/1994 | EP0521052B1 Process and device for monitoring the performance of a catalyst in an internal combustion engine |
| 01/25/1994 | US5280707 Apparatus for detecting deterioration of catalyst |
| 01/18/1994 | US5279116 Device for determining deterioration of a catalytic converter for an engine |
| 01/18/1994 | US5279115 Device for detecting the degree of deterioration of a catalyst |
| 01/18/1994 | US5279114 Apparatus for detecting deterioration of catalyst of internal combustion engine |
| 01/06/1994 | WO1993020340A3 Methods and device for assessing the operatability of a catalytic converter |
| 01/05/1994 | DE4322361A1 IC engine exhaust control system with catalyser - monitors exhaust gases on either side of catalyser and controls inlet mixture with processor control |
| 01/05/1994 | DE4322341A1 Control system for catalyser in vehicle exhaust - monitors saturation of the gases through catalyser relative to changes in the fuel-air mixture |
| 12/28/1993 | US5272873 Evaporative emission control system for internal combustion engines |
| 12/28/1993 | US5272872 Method and apparatus of on-board catalytic converter efficiency monitoring |
| 12/21/1993 | US5272769 Emission system component inspection system |
| 12/16/1993 | DE4318640A1 Monitoring system for leakage of exhaust gas pipes at IC engines - uses at least two lambda probes arranged at distance from each other within gas exhaust section and their output signals are led to control unit. |
| 12/16/1993 | DE4318639A1 Monitoring leakage from exhaust gas pipes of IC engines - using lambda probe and measuring amplitude of pulsation frequencies in output signal of probe and producing fault signal on exceeding threshold amplitude. |
| 12/16/1993 | DE4219433A1 Controlling computer based process control system - using monitoring and alarm system with deactivation of alarm after set period followed by restart and repeated number of times |
| 12/16/1993 | DE4219219A1 Testing catalytically cleaned vehicle exhaust gas - directly displaying or storing in memory of measured values from fixed probe placed in exhaust flow downstream of catalyser. |
| 12/07/1993 | US5268086 Catalyst monitoring using ego sensors |
| 12/07/1993 | US5267472 Method and arrangement for determining the performance loss of a catalyzer |
| 12/07/1993 | US5267439 Method and arrangement for checking the aging condition of a catalyzer |
| 11/30/1993 | US5265417 Method and apparatus for determining the hydrocarbon conversion efficiency of a catalytic converter |
| 11/30/1993 | US5265416 On-board catalytic converter efficiency monitoring |
| 11/16/1993 | US5261230 Device for controlling heating of catalyst for purifying exhaust gas |
| 11/09/1993 | US5259189 Method and apparatus for monitoring a catalytic converter |
| 10/26/1993 | US5255515 Method and arrangement for obtaining an evaluation value for the performance loss of a catalytic converter |
| 10/26/1993 | US5255511 Method and apparatus for operational monitoring of a catalytic converter of an internal combustion engine and a catalytic converter to be monitored |
| 10/14/1993 | WO1993020340A2 Methods and device for assessing the operatability of a catalytic converter |
| 10/13/1993 | EP0565142A2 Catalyst with at least one temperature sensor |
| 10/07/1993 | DE4211116A1 On-board detection of state of IC engine exhaust catalyser - increasing lean-rich cycle until exhaust gas probe signal indicates noticeable change to determine oxygen@ storage capacity |
| 10/07/1993 | DE4211092A1 Verfahren und Vorrichtung zum Beurteilen der Funktionsfähigkeit eines Katalysators Method and apparatus for evaluating the operability of a catalyst |
| 08/24/1993 | US5237818 Conversion efficiency measuring apparatus of catalyst used for exhaust gas purification of internal combustion engine and the method of the same |
| 08/10/1993 | US5233829 Exhaust system for internal combustion engine |
| 07/22/1993 | WO1993014305A1 Process for monitoring a catalytic exhaust gas purifying system of an internal combustion engine |
| 07/22/1993 | DE4201136A1 Verfahren zur ueberwachung einer katalytischen abgasreinigungsanlage eines verbrennungsmotors Process for the catalytic emission control system ueberwachung a combustion engine |
| 07/20/1993 | US5228335 Method and apparatus for detection of catalyst failure on-board a motor vehicle using a dual oxygen sensor and an algorithm |
| 07/20/1993 | US5228287 Exhaust system for internal combustion engine |
| 07/06/1993 | US5224347 Method and apparatus for controlling the air-fuel ratio of a gas engine |
| 06/24/1993 | DE4243339A1 Monitoring system for engine exhaust gas purification arrangement - contains fuel-air or oxygen conc. sensors upstream and downstream of catalyser, filter and correlation function system |
| 06/23/1993 | EP0547326A2 A device for determining deterioration of a catalytic converter for an engine |
| 06/22/1993 | US5220788 Apparatus for detecting purification factor of catalyst in catalytic converter of internal combustion engine |
| 06/16/1993 | EP0546318A1 Method and device for the determination of the conversion efficiency of a catalyst |
| 06/01/1993 | US5214915 Method and arrangement for simulating the dynamic performance of an exhaust gas catalyzer |
| 05/27/1993 | DE4238807A1 IC engine exhaust gas catalyser monitoring system - uses cross-correlation function for signals from oxygen@ sensors inserted in exhaust line before and after catalyser |
| 05/19/1993 | EP0541538A1 Method and apparatus for detecting soot concentration in particulate trap |
| 05/13/1993 | WO1993009335A1 Method for monitoring the efficiency of a catalytic converter for treating exhaust gases from an internal combustion engine |
| 05/11/1993 | US5209060 Method for the continuous lambda control of an internal combustion engine having a catalyzer |
| 05/04/1993 | US5207093 Failure diagnosis device for an EGR control system |
| 05/04/1993 | US5207057 Air-fuel ratio control device for an engine |
| 04/29/1993 | DE4134949A1 Method of maintenance of soot filter - enables soot to be burnt in filter and filter to be cleaned by reverse flow |
| 04/20/1993 | US5203165 Method for the lambda control of an internal combustion engine having a catalyzer |
| 04/15/1993 | DE4233977A1 IC engine exhaust system catalyser deterioration detector - contains upstream and downstream oxygen sensors, arrangement for evaluating areas of sensor signal graphs |
| 04/14/1993 | EP0536789A2 A device for determining deterioration of a catalytic converter for an engine |
| 04/14/1993 | EP0536158A1 Process for protecting catalysts used for cleaning exhaust gases and heat tone sensor for implementing the process. |
| 04/13/1993 | US5201802 Zeolite catalyst |
| 04/08/1993 | DE4133117A1 Decontamination of combustion engine exhaust gases - preheating catalyser, e.g. by feeding secondary air or electrical heating, according to its ageing state and downstream temp. |
| 03/18/1993 | WO1993005388A1 Antenna system for soot detecting apparatus |
| 03/18/1993 | WO1993005284A1 Temperature measurement and/or heating device and its use in a honeycombed body, in particular a catalyzer bearing body |
| 03/18/1993 | CA2117078A1 Antenna system for soot detecting apparatus |
| 03/10/1993 | EP0530655A2 Method and apparatus for controlling an internal combustion engine and testing its catalytic converter |
| 03/09/1993 | US5191763 Device for controlling heating of catalyzer for purifying exhaust gas |
| 03/09/1993 | US5191762 System for detecting deterioration of a three-way catalyst of an internal combustion engine |
| 03/04/1993 | DE4128823A1 Exhaust catalyst reserve capacity determn. during stationary running of engine - using lambda signals from oxygen@ probes |