Fuel evaporative emission control system for internal combustion

Details Fuel evaporative emission control system for internal combustion Fuel evaporative emission control system for internal combustion

1992-10-09

1993-08-03

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123698, 123520, 123 1A, F02M 2508

Patent

active

052319695

ABSTRACT:
A fuel evaporative emission control system for an internal combustion engine using a gasoline-alcohol blend fuel. The system includes a canister for trapping fuel vapors to purge them into an air intake passage of the engine through a pipe. A valve is provided at the pipe for closing/opening the same to control purging of fuel vapors to the air intake passage. In the system, when the fuel property is found to be changed from alcohol concentration detected, the valve is opened if correction coefficient for air-fuel ratio determined from an oxygen content sensor's output is within a predetermined upper and lower limit, while the valve is closed if the coefficient falls outside the range, whereby preventing degradation of the exhaust gas properties, misfiring and the like.

REFERENCES:
patent: 4865000 (1989-09-01), Yajima
patent: 4945885 (1990-08-01), Gonze et al.

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