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

1998-08-14

2000-02-01

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123680, F02D 4114

Patent

active

060190930

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine includes an air-fuel ratio sensor arranged in the exhaust system of the engine, for detecting the air-fuel ratio of exhaust gases from the engine. An ECU calculates an adaptive control amount, based on an output from the air-fuel ratio sensor, by using an adaptive controller having an adaptive parameter-adjusting mechanism, such that the air-fuel ratio of a mixture supplied to the engine is converged to a desired air-fuel ratio, and controls the air-fuel ratio of the mixture in a feedback manner, according to the adaptive control amount. When a particular engine operating condition in which the adaptive controller can become unstable in operation is detected, the adaptive parameters are initialized according to the adaptive control amount.

REFERENCES:
patent: 5558075 (1996-09-01), Maki et al.
patent: 5636621 (1997-06-01), Maki et al.

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