Method of controlling air-fuel ratio

Details Method of controlling air-fuel ratio Method of controlling air-fuel ratio

1984-08-24

1985-12-31

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123480, 123440, F02M 700

Patent

active

045614008

ABSTRACT:
There is disclosed a method of controlling the air-fuel ratio in which the fuel injection rate is controlled by the learning correction coefficient for obstruction of the air flow motor so as to compensate the aging of the air flow meter, and there are a plurality of learning correction coefficients allotted to the predetermined intake air flow rate regions Q.sub.1 -Q.sub.n. The intake air flow rate is measured and the judgement is made as to which region the measured flow rate belongs to. When the measured intake air flowrate is judged to be in any flowrate region other than the flowrate Q.sub.1 corresponding to the full closing of a throttle valve, the obstruction compensating learning correction coefficients FGQ.sub.2 -FGQ.sub.n allotted to all of the flowrate regions excluding the obstruction compensating learning correction coefficient FGQ.sub.1 allotted to the flow-rate region Q.sub.1 are simultaneously learned.

REFERENCES:
patent: 4442815 (1984-04-01), Ninomiya
patent: 4495921 (1985-01-01), Sawamoto
patent: 4495925 (1985-01-01), Hasegawa
patent: 4502442 (1985-03-01), Takakawa et al.
patent: 4522178 (1985-01-01), Amano et al.

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