Fuel vapor control device

Details Fuel vapor control device Fuel vapor control device

1986-01-17

1987-10-20

Cox, Ronald B.

Internal-combustion engines

Charge forming device

Fuel flow regulation between the pump and the charge-forming...

123519, F02M 3302

Patent

active

047006820

ABSTRACT:
A fuel vapor control device having a valve opening and closing a passage connecting a carburetor and a charcoal canister according to a predetermined temperature. A first coil spring formed by a "shape memory effect" alloy is provided to urge the valve to open the passage when the temperature is high. A second coil spring urges the valve to close the passage. A solenoid is provided to urge an armature against the valve to close the passage against the force of the first coil spring when the engine is running. The solenoid heats the first coil spring to generate a spring force therein when the engine is running. When the engine is turned off, the solenoid is deactivated, and the force of the first spring overcomes the force of the second spring to open the passage until such time as the temperature of the first spring drops below the predetermined temperature.

REFERENCES:
patent: 2917110 (1959-12-01), Brohl
patent: 3645443 (1972-02-01), Willson et al.
patent: 4157366 (1979-06-01), Ruth
patent: 4395991 (1983-08-01), Miyachi
patent: 4577607 (1986-03-01), Nishio

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