Anti-permeation filter for vapor management valve

Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system

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123516, 25112921, 251 34, F02M 3302

Patent

active

054290996

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 addition, an anti-permeation filter is provided for inhibiting the venting of fuel vapors to atmosphere that have permeated through the diaphragm valve. 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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