Air-fuel ratio control system for internal combustion engine

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

1992-09-23

1994-09-06

Argenbright, Tony M.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

123680, 123682, F02D 4114

Patent

active

053437012

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine utilizes a pre-stored standard relation between an air-fuel ratio sensor signal and a standard air-fuel ratio indicative value for deriving the standard air-fuel ratio indicative value based on the sensor signal. The system further utilizes a pre-stored modified relationship between the standard air-fuel ratio indicative value and a for-control air-fuel ratio indicative value for deriving a for-control air-fuel ratio indicative value based on the derived standard air-fuel ratio indicative value. In the modified relationship, the for-control air-fuel ratio indicative value varies with respect to a corresponding variation of the standard air-fuel ratio indicative value within a given range across the standard air-fuel ratio indicative value representing a stoichiometric air-fuel ratio.

REFERENCES:
patent: 4779414 (1988-10-01), Nagai et al.
patent: 4917067 (1990-04-01), Yoshida
patent: 5090199 (1992-02-01), Ikuta et al.
patent: 5157920 (1992-10-01), Nakaniwa
Patent Abstracts of Japan, vol. 11, No. 76 (M-569) Mar. 7, 1987, abstract of JP-A-61232350.

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