Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1994-02-28
1995-08-01
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, F02M 3302
Patent
active
054372577
ABSTRACT:
An evaporative emission control system of an internal combustion engine's fuel system including a vent valve. The vent valve provides a mechanism for closing the evaporative emission control system creating a pressure differential between system and atmospheric under various conditions whereby the system can be automatically diagnosed. The vent valve relieves pressure or vacuum in the system that exceeds a threshold necessary to detect the presence of leaks. The vent valve includes a vacuum actuator providing a low restriction flow path for system purges.
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"Evaporative Emission (EVAP) Control System", Section C3, Vehicle Service Manual, General Motors Corporation, 1992.
Giacomazzi Roy A.
Przeklas Chester W.
Rich Gregory E.
Turner Kenneth W.
General Motors Corporation
Miller Carl S.
Sedlar Jeffrey A.
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