Method and system for control of air-fuel ratio

Details Method and system for control of air-fuel ratio Method and system for control of air-fuel ratio

1982-01-25

1984-06-26

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

123419, 123436, F02B 308, F02B 3200

Patent

active

044559810

ABSTRACT:
A system for controlling the air-fuel ratio in which the amount of fuel injected into the engine is controlled in accordance with the flow rate of air passing through an air intake pipe including a throttle valve for introducing the air into the engine and the engine operating conditions. A bypass of the air intake pipe is opened or closed to change the air-fuel ratio of the mixture to slightly richer and leaner sides of a basic air-fuel ratio, and the change of the engine output conditions based on the change of the air-fuel ratio is used to correct the air-fuel ratio in an optimum direction. On the basis of a parameter indicating the engine operating conditions such as the detection value of the intake pipe pressure, a control is made to introduce the air which passed through the bypass to one of the upstream or downstream portion of the throttle valve.

REFERENCES:
patent: 4026251 (1977-05-01), Schweitzer et al.
patent: 4303048 (1981-12-01), Nishio
patent: 4363305 (1982-12-01), Ohgami et al.
patent: 4368707 (1983-01-01), Leshner et al.
patent: 4377143 (1983-03-01), Hamburg

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