High flow, low vacuum carbon canister purge valve

Details High flow, low vacuum carbon canister purge valve High flow, low vacuum carbon canister purge valve

2007-12-25

2007-12-25

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C123S519000

Reexamination Certificate

active

11585596

ABSTRACT:
A technique is provided for purging an adsorption canister in a fuel tank vent system. The technique provides a relatively high purge flow under conditions wherein the intake manifold vacuum is relatively low. A sonic nozzle is placed in the purge line between the existing purge valve and the adsorption canister. The sonic nozzle includes a tap at its throat for producing a vacuum in response to flow in the purge line. The vacuum is used to control a vacuum operated diaphragm valve in a parallel purge line. The system therefore supplements purge flow through the adsorption canister to the intake manifold.

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