Vapor management valve

Details Vapor management valve Vapor management valve

1993-02-04

1994-01-11

Cross, E. Rollins

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123520, F02M 3302

Patent

active

052771679

ABSTRACT:
A flow regulator for automotive vehicles of the type having a computer-controlled emission control system. The flow regulator has an electric vacuum regulator (EVR) valve that regulates the vacuum signal provided to a vacuum regulator valve in accordance with the current signal supplied to the EVR valve by the engine controller unit. The vacuum regulator valve includes a control chamber and a valve chamber that are separated by a movable diaphragm valve assembly. The preload on a biasing spring acting on the diaphragm valve assembly can be adjusted during calibration of the flow regulator for setting a first calibration point. An adjustable flow restrictor provided in the inlet portion of the vacuum regulator valve can be varied during calibration for setting a second calibration point. In operation, the flow regulator is operable to generate substantially linear output flow characteristic between the two calibration points as a function of the current signal in a manner that is independent of changes in manifold vacuum.

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patent: 5054455 (1991-10-01), Cook
patent: 5069188 (1991-12-01), Cook
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patent: 5113837 (1992-05-01), Faull
patent: 5115785 (1992-05-01), Cook
patent: 5183022 (1993-02-01), Cook

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