Air-fuel ratio control system for internal combustion engines

Details Air-fuel ratio control system for internal combustion engines Air-fuel ratio control system for internal combustion engines

1995-08-22

1997-08-19

Nguyen, Hoang

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, F02D 4114

Patent

active

056576277

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine having at least one catalytic converter arranged in the exhaust passage, comprises an ECU which changes air intake characteristics of the engine, based on operating conditions of the engine, and a plurality of exhaust gas component concentration sensors including at least upstream and downstream exhaust gas component concentration sensors arranged in the exhaust passage at respective locations upstream and downstream of the at least one catalytic converter. The air-fuel ratio of an air-fuel mixture to be supplied to the engine is controlled to a desired air-fuel ratio in a feedback manner responsive to an output from the upstream exhaust gas component concentration sensor. A feedback control parameter for use in the air-fuel ratio feedback control is calculated based on an output from the downstream exhaust gas component concentration sensor. The updating rate of the feedback control parameter is changed when the feedback control parameter is calculated, according to the air intake characteristics of the engine.

REFERENCES:
patent: 5357754 (1994-10-01), Ogawa et al.
patent: 5533332 (1996-07-01), Uchikawa
patent: 5537817 (1996-07-01), Akazaki et al.

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