About 40 results
https://drivepatents.com/patents/1099834 · 11 Dec 2002
An exhaust emission control system for an internal combustion engine is disclosed. The system includes a NOx removing device provided in an exhaust system of the engine for removing NOx contained in exhaust gases, and an oxygen concentration sensor provide...
https://drivepatents.com/patents/1101581 · 25 Sep 2002
A target air-fuel ratio KCMD for an exhaust gas upstream of a catalytic converter (3) is sequentially determined to converge the output V02/OUT of an 02 sensor (6) downstream of the catalytic converter to a target value V02/TARGET, and the amount of fuel s...
https://drivepatents.com/patents/1104746 · 2 May 2002
The control of an internal combustion motor (10), with an exhaust catalyst, takes into account the condition of the catalyst (24) and especially its aging. The motor is run in at least two operating modes, where one mode gives a better exhaust emission. Th...
https://drivepatents.com/patents/1105332 · 10 Apr 2002
An air-fuel ratio control apparatus of an internal combustion engine (1) according to the present invention is provided with oxygen storage amount estimating means for estimating an oxygen storage amount of an exhaust purifying catalyst (19) and air-fuel r...
https://drivepatents.com/patents/1106830 · 6 Feb 2002
An on-board diagnostic system and method for directly monitoring the efficiency of a catalyst having negligible oxygen storage capacity is provided. The monitoring system includes an oxygen sensor mounted at a first end of the conditioning catalyst, and an...
https://drivepatents.com/patents/1108285 · 28 Nov 2001
A second lambda sensor is not employed for monitoring until, under conditions of rich exhaust, its output voltage lies no more than a given potential difference above a desired value.
https://drivepatents.com/patents/1110616 · 29 Aug 2001
A controller computes an oxygen storage amount of a catalyst based on the characteristics of an exhaust flowing into the catalyst, and controls the air-fuel ratio of an engine so that the oxygen storage amount of the catalyst is a target value. When it is ...
https://drivepatents.com/patents/1111299 · 1 Aug 2001
An exhaust-gas cleaning device comprises an absorption quantity detector (22) for determining the first and second amounts of NOx and oxygen absorbed by a NOx-absorbing material and an oxygen-absorbing material during first and second reference times based...
https://drivepatents.com/patents/1111680 · 11 Jul 2001
Method and apparatus for monitoring a catalytic converter (32) during engine (catalyst) warm-up by first and second heated exhaust gas oxygen sensors (60, 70) located upstream and downstream, respectively, of the catalytic converter. A microprocessor deter...
https://drivepatents.com/patents/1112550 · 13 Jun 2001
A first exhaust gas sensor 5 (air-fuel ratio sensor) and a second exhaust gas sensor 6 (O2 sensor) are disposed respectively upstream and downstream of a catalytic converter3. An exhaust system E which ranges from the exhaust gas sensor 5 to the exhaust ga...