About 104 results
https://drivepatents.com/patents/1083333 · 6 Oct 2004
A diagnosis system of an exhaust aftertreatment apparatus (17) for an internal combustion engine (1) is arranged to execute a first deterioration diagnosis (S2) of the exhaust aftertreatment apparatus on the basis of a change of a catalyst downstream side ...
https://drivepatents.com/patents/1083515 · 29 Sep 2004
There is provided a failure diagnostic system which includes an intake channel (9,10) and an exhaust channel (13,14,20) in communication with cylinders of an internal combustion engine (1); the exhaust pressure increasing device (40) that increases the exh...
https://drivepatents.com/patents/1083808 · 22 Sep 2004
A method for estimating the degradation of the trapping capacity (C) of a NOx-Trap catalytic converter (11), in accordance with which, if the actual duration of a first NOx regeneration process is equal to the predetermined duration, it is assumed that the...
https://drivepatents.com/patents/1085596 · 14 Jul 2004
An exhaust gas purification system comprises a particulate filter, a sensor, and a controller. The filter is located in an exhaust passage of the engine and traps particulate in an exhaust gas. The sensor detects the filter differential pressure between an...
https://drivepatents.com/patents/1085895 · 30 Jun 2004
In a process to monitor the concentration of NOx in automotive exhaust gases, a sensor monitors the change in NOx gas concentration for plausibility against pre-determined operating parameters. The plausibility is tested by monitoring the NOx signal activi...
https://drivepatents.com/patents/1086286 · 23 Jun 2004
There is provided an adsorbent degradation determining system that is capable of suppressing attachment of impurities to a sensor element (18a) of a humidity sensor (18), thereby enabling the humidity sensor (18) to preserve excellent detection accuracy, a...
https://drivepatents.com/patents/1086643 · 9 Jun 2004
The method of monitoring the exhaust gas handling system (115) for a motor vehicle internal combustion engine (100) involves feeding a reducing medium such as a urea-water mix into the exhaust. The mixture can be varied to determine if a signal from an exh...
https://drivepatents.com/patents/1086559 · 9 Jun 2004
Process for diagnosing a NOx storage catalyst arranged in an exhaust gas channel of an I. C. engine comprises, when the vehicle is stationary, adjusting the catalyst temperature to a value in a region representing NOx storage, adjusting a NOx reference sta...
https://drivepatents.com/patents/1086832 · 2 Jun 2004
A humidity sensor 4 is disposed downstream of an exhaust gas purifier comprising a hydrocarbon adsorbing catalyst 2, and an air-fuel ratio sensor 5 is disposed at least downstream of the exhaust gas purifier. The hydrocarbon adsorbing ability of a hydrocar...
https://drivepatents.com/patents/1087646 · 28 Apr 2004
An exhaust emission control system comprises nitrogen oxide storage/reduction catalyst (7) disposed in an exhaust passage (3) of an internal combustion engine (1) and a nitrogen oxide sensor (9) positioned in the passage downstream of the catalyst. A contr...