Fuel evaporative gas and air-fuel ratio control system

Details Fuel evaporative gas and air-fuel ratio control system Fuel evaporative gas and air-fuel ratio control system

1994-08-25

1996-05-28

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123698, 123520, F02D 4114

Patent

active

055201601

ABSTRACT:
A system for solving disturbances in the air-fuel ratio caused by a change in the normal correction factor, and permitting achievement of a highly accurate air-fuel ratio control. Fuel evaporative gas generated in a fuel tank is adsorbed in a canister, and then discharged into an intake pipe of an internal combustion engine. ECU calculates the fuel supply quantity to the internal combustion engine on the basis of the condition in which the internal combustion engine is operating, performs feedback control and learning control of an air-fuel ratio on the basis of a detection signal from an oxygen sensor, and corrects the fuel supply quantity by means of an air-fuel correction factor. ECU also controls fuel injection by an injector by decrement-correcting the fuel supply quantity in response to the quantity of discharged evaporative gas. Furthermore, ECU adjusts, upon decrement correction of the fuel supply quantity in response to the quantity of discharged evaporative gas, the quantity of the decrement correction so as to be proportional to the normal correction factor including the air-fuel ratio correction factor.

REFERENCES:
patent: 4748959 (1988-06-01), Cook et al.
patent: 5048492 (1991-09-01), Davenport et al.
patent: 5090388 (1992-02-01), Hamburg et al.
patent: 5125385 (1992-06-01), Frinzel
patent: 5271374 (1993-12-01), Nagaishi et al.
patent: 5400761 (1995-03-01), Fukasawa et al.
patent: 5406927 (1995-04-01), Kato et al.

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