Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1993-10-15
1994-10-25
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, F02M 3302
Patent
active
053579348
ABSTRACT:
An apparatus for controlling pressures within a fuel tank is provided in a purge pipe connected between the fuel tank and a canister. In an operating condition of an engine, a diaphragm in a control valve provided in a purge pipe between the fuel tank and the canister is moved upward by an intake negative pressure to decrease a set load of a spring, and in a stopped condition of the engine, the diaphragm moves downward to increase the set load of the spring. As a result, in the operating condition of the engine, a valve member is opened when a pressure within the fuel tank exceeds a lower predetermined level. In the stopped condition of the engine, the valve member is opened when a pressure within the fuel tank exceeds a higher predetermined level. Therefore, even when a leakage accident occurs in the operating condition of the engine, evaporated fuel is prevented as much as possible from being discharged in a large amount into the atmosphere. In the stopped condition of the engine, an amount of evaporated fuel produced within the fuel tank can be reduced, so that a canister can be of a compact size.
REFERENCES:
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"Evaporative Emission Control System (EECS)" Deville/Fleetwood Service Information Manual 1989--(Driveability And Emission Controls 6E-C3-1).
Iida Hisashi
Tagawa Yasuo
Miller Carl S.
Nippondenso Co. Ltd.
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