Air-fuel ratio control system for engines

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

1992-10-15

1994-07-12

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123688, F02D 4114

Patent

active

053278763

ABSTRACT:
This invention relates to an air-fuel ratio control system for an engine which can continuously detect the air-fuel ratio of the air-fuel mixture supplied to the engine using an air-fuel ratio sensor within a wide range including the theoretical air-fuel ratio, and can then, based on the sensor output, perform feedback correction of the air-fuel ratio to the theoretical air-fuel ratio or to another air-fuel ratio. The deterioration of the air-fuel ratio sensor is judged based on the difference between the feedback correction coefficient when feedback control is performed to the theoretical air-fuel ratio, and the feedback correction coefficient when it is performed to another air-fuel ratio. Deterioration of the sensor is thereby detected completely separate from scatter or deterioration of performance of the fuel injector or other components.

REFERENCES:
patent: 5065728 (1991-11-01), Nakaniwa
patent: 5179929 (1993-01-01), Miyashita et al.

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