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

1998-11-18

2000-07-04

Yuen, Henry C.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123688, F02D 4100

Patent

active

060823453

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine is provided, which includes an oxygen concentration sensor arranged in the exhaust system and having an output characteristic that an output thereof is substantially proportional to concentration of oxygen present in exhaust gases from the engine. An ECU is responsive to the output of the oxygen concentration sensor, for carrying out feedback control of the air-fuel ratio of a mixture supplied to the engine so as to make the air-fuel ratio equal to a desired air-fuel ratio. An activated state of the oxygen concentration sensor is detected. Correction of the air-fuel ratio of the mixture by the feedback control is limited, depending upon the detected activated state of the oxygen concentration sensor.

REFERENCES:
patent: 4505246 (1985-03-01), Nakajima et al.
patent: 5483946 (1996-01-01), Hamburg et al.
patent: 5656190 (1997-08-01), Aoki
patent: 5709198 (1998-01-01), Sagisaka et al.
patent: 5852228 (1998-12-01), Yamashita et al.

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