Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1987-09-25
1989-09-12
Miller, Carl Stuart
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123458, F02M 2900
Patent
active
048650005
ABSTRACT:
Herein disclosed is an air-fuel ratio control system for an internal combustion engine which has at its evaporative emission control system a charcoal canister for trapping fuel vapors from a fuel tank or the like. An electromagnetic valve of a type which increases its open degree which increases a duty value represented by an instruction signal applied thereto is disposed in a purge line by which the canister and an induction passage of the intake system of the engine is fluidly connected. A feedback correction value is provided from a difference between an actual air-fuel ratio of the air-fuel mixture and a target air-fuel ratio for operating the engine under a feedback control. A control unit is provided which reduces the duty value when the engine operation is under the feedback control and the feedback correction value exceeds a predetermined control range.
REFERENCES:
patent: 4467769 (1984-08-01), Matsumura
patent: 4641623 (1987-02-01), Hamburg
patent: 4664087 (1987-05-01), Hamburg
patent: 4677956 (1987-07-01), Hamburg
patent: 4683861 (1987-08-01), Breitkreuz
Miller Carl Stuart
Nissan Motor Co,. Ltd.
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