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

1999-11-16

Kwon, John

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123677, 123682, F02M 2500

Patent

active

059838744

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. An ECU estimates the air-fuel ratio of a mixture supplied to each of the cylinders cylinder by cylinder in response to an output from the air-fuel ratio sensor, by using an observer for observing an internal operative state of the exhaust system, based on a model representative of the behavior of the exhaust system, and calculates cylinder-by-cylinder air-fuel ratio control amounts corresponding respectively to the cylinders for carrying out feedback control of the air-fuel ratio of the mixture supplied to each of the cylinders such that the estimated air-fuel ratio of the mixture supplied to each of the cylinders is converged to a desired value. Upper and lower limit values of the cylinder-by-cylinder air-fuel ratio control amounts are set according to at least one of an rotational speed change amount of the engine and atmospheric pressure, and the cylinder-by-cylinder air-fuel ratio control amounts are limited so as to fall within an allowable range defined by the upper and lower limit values.

REFERENCES:
patent: 5524599 (1996-06-01), Kong et al.
patent: 5657736 (1997-08-01), Maki et al.
patent: 5806506 (1998-09-01), Kitamura et al.
patent: 5813389 (1998-09-01), Kitamura et al.
patent: 5911682 (1999-06-01), Kato et al.

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