Evaporative emission canister purge actuation monitoring system

Details Evaporative emission canister purge actuation monitoring system Evaporative emission canister purge actuation monitoring system

2007-07-24

2008-10-07

Miller, Carl S (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C123S1980DA

Reexamination Certificate

active

07431022

ABSTRACT:
An evaporative emission canister purge actuation monitoring system includes an integrated valve body having a main flow passage, a first one-way umbrella valve mounted to the valve body that is responsive to predetermined positive pressure in the main flow passage to control flow of fluid from a vapor canister to ambient air as well as a second one-way umbrella valve that is responsive to a predetermined negative pressure in the main flow passage to control the flow of ambient air through a fresh air port. A vacuum actuated switch is supported by the integrated valve body and in electrical communication with a control unit. The switch is responsive to negative pressure in the main flow passage to send a signal indicative of the predetermined negative pressure to the control unit.

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