About 104 results
https://drivepatents.com/patents/1089421 · 25 Feb 2004
In a process to operate a lean-burn internal combustion engine, the exhaust system has a pre-catalytic converter discharging to a NOx storage catalytic converter. In the process, the storage activity is determined, together with temperature values for both...
https://drivepatents.com/patents/1091458 · 3 Dec 2003
A method and system may be provided to perform a process for controlling NOx emissions of an target engine. In one embodiment of the invention, the process may include determining predicted NOx values based on a model (139) reflecting a predetermined relat...
https://drivepatents.com/patents/1091550 · 26 Nov 2003
The system tests the efficiency of a catalyst converter (42), in the exhaust pipe (40) of an automobile exhaust system (16) from an internal combustion motor (14) with direct petrol or diesel fuel injection, to oxidize the reduction elements within the exh...
https://drivepatents.com/patents/1091631 · 26 Nov 2003
An exhaust passage (20) of an internal-combustion engine (1) is provided with exhaust emission control means (40) capable of reducing harmful substances in exhaust gas under a given exhaust pressure condition and an exhaust sensor (22) for detecting the co...
https://drivepatents.com/patents/1097652 · 12 Mar 2003
A state determining apparatus for an exhaust gas purifier (6) is provided for accurately determining the state of the exhaust gas purifier including an adsorbent (7) for adsorbing hydrocarbons, including a deterioration of the adsorbent (7), in accordance ...
https://drivepatents.com/patents/1097823 · 5 Mar 2003
There is provided a temperature control system (1) for a humidity sensor (18,30), which is capable of eliminating impurities attached to a sensor element of the sensor efficiently and sufficiently while preventing the sensor element from being cracked due ...
https://drivepatents.com/patents/1102775 · 7 Aug 2002
A diagnostic system in which the accuracy of the diagnosis of the deterioration state of a catalyst (40 in Fig. 1) in a catalytic converter (4) for cleaning the exhaust gas of an internal combustion engine (2) is enhanced without incurring a rise in cost. ...
https://drivepatents.com/patents/1102926 · 24 Jul 2002
An ECU (80) of an internal combustion engine (1) prohibits a deterioration determination of an occlusion/reducing type NOx catalyst for a predetermined period of time when the condition that the fuel supply to a downstream of the catalyst (41) in the exhau...
https://drivepatents.com/patents/1104659 · 8 May 2002
There are provided a failure determination device for determining failure of a humidity sensor that detects the humidity of exhaust gases from an internal combustion engine and a control system for an exhaust passage changeover valve. In one form of the in...
https://drivepatents.com/patents/1105670 · 27 Mar 2002
A method and apparatus for determining the capacity of a trap to store NOX based on the change in oxygen storage in the trap (36) occurring as a result of sulphurisation of the trap.