Apparatus and method for internal-combustion engine control

Details Apparatus and method for internal-combustion engine control Apparatus and method for internal-combustion engine control

1995-05-10

1997-01-21

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60278, 60285, 60301, F01N 320

Patent

active

055950604

ABSTRACT:
In a control apparatus and control method for an internal combustion engine having an exhaust purifying catalytic device for adsorbing nitrogen oxide contained in exhaust gases from the engine, the adsorption state of nitrogen oxide adsorbed by the catalytic device is estimated by an electronic control unit during the lean-combustion driving of the engine. If the catalytic device is saturated with nitrogen oxide, the ignition timing is delayed and the exhaust gas is recirculated to the intake side of the engine with the lean air-fuel ratio kept unchanged. This starts the nitrogen oxide reduced driving mode for deteriorating the combustion state in the engine. At this time, the engine output will not change by a great amount. Further, a reducing atmosphere is created around the catalytic device by unburnt gases, generated due to the deterioration of the combustion state, to deoxidize the adsorbed nitrogen oxide. As a result, the purifying ability of the catalytic device can be recovered to suppress the discharge amount of nitrogen oxide without deteriorating the smoothness of engine driving and fuel economy.

REFERENCES:
patent: 5172550 (1992-12-01), Takeshima
patent: 5209061 (1993-05-01), Takeshima
patent: 5357749 (1994-10-01), Ohsuga
patent: 5437153 (1995-08-01), Takeshima

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