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

1997-09-25

1999-03-23

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

701109, F02D 4114

Patent

active

058846131

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine includes an air-fuel ratio sensor arranged in the exhaust system, for detecting the air-fuel ratio of exhaust gases from the engine. An ECU calculates an air-fuel ratio control amount, based on the output from the air-fuel ratio sensor, by using an adaptive controller having an adaptive parameter-adjusting mechanism for adjusting adaptive parameters, 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 calculated air-fuel ratio control amount. The adaptive parameter-adjusting mechanism calculates a parameter corresponding to an integral term of the air-fuel ratio control amount, and limit-checks a value of the parameter corresponding to the integral term so as to fall within a predetermined limit range.

REFERENCES:
patent: 5724952 (1998-03-01), Miyashita et al.
patent: 5732689 (1998-03-01), Ohno et al.
"Combining Model Reference Adaptive Controllers and Stochastic Self-tuning Regulators", Landau, Automatica, vol. 18, No. 1, 1982, pp. 77-84.
"A Survey of Model Reference Adaptive Techniques-Theory and Applications", Landau, Automatica, vol. 10, 1974, pp. 353-379.
"Unification of Discrete Time Explicit Model Reference Adaptive Control Designs", Landau et al, Automatica, vol. 17, No. 4, 1981, pp. 593-611.
Computrol, No. 27, Corona Publishing Co., Ltd., pp. 28-41, 1989.
Automatic Control Handbook, OHM Ltd., pp. 703-707, 1983.

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