Air-fuel ratio control method for internal combustion engines

Details Air-fuel ratio control method for internal combustion engines Air-fuel ratio control method for internal combustion engines

1991-09-10

1993-05-11

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

74860, F02D 4114

Patent

active

052092135

ABSTRACT:
A method of feedback-controlling the air-fuel ratio of a mixture supplied to an internal combustion engine to a desired air-fuel ratio which is set to a value leaner than a stoichiometric air-fuel ratio, by the use of output from an exhaust gas ingredient concentration sensor, depending upon operating conditions of the engine, the desired air-fuel ratio being set to a leaner value as the transmission of the engine is set to a smaller reduction ratio. A reduction ratio to which the transmission has been set is detected. The travelling speed of a vehicle on which the engine is installed is detected. The desired air-fuel ratio is set to a richer value as the travelling speed of the vehicle is lower, insofar as the transmission is set to the same reduction ratio.

REFERENCES:
patent: 4596164 (1986-06-01), Hasegawa
patent: 4732130 (1988-03-01), Suzuki
patent: 4823642 (1989-04-01), Iwaki et al.
patent: 4877006 (1989-10-01), Noguchi et al.
patent: 4924832 (1990-05-01), Abe
patent: 5027770 (1991-07-01), Yano et al.

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