Closed loop air/fuel ratio control of i.c. engine using learning

Internal-combustion engines – Charge forming device – Fuel injection system

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123520, F02M 5100, F02M 2508

Patent

active

044677693

ABSTRACT:
In a feedback control system for air/fuel ratio control of an internal combustion engine, in which an integration correcting amount is derived from the output signal of a gas sensor indicative of the concentration of an exhaust gas component, and an engine condition correcting amount read out from a memory is arranged to be renewed in accordance with the integration correcting amount so as to effect learning correction, fuel vapor evaporated in a fuel tank is selectively fed via a canister to the engine by controlling an electromagnetic valve. When the engine is in a predetermined operational condition, the electromagnetic valve is energized to disable a fuel vapor supply system. The learning correction is performed only when the fuel vapor supply system is disabled so that the value of the engine condition correcting amount is not affected by a rich mixture caused by the fuel vapor from the canister.

REFERENCES:
patent: 4235204 (1980-11-01), Rice
patent: 4308842 (1982-01-01), Watanabe et al.
patent: 4381753 (1983-05-01), Yuzawa et al.
Research Disclosure, # 17419, Oct. 1978, No. 174.

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