Two-stage high flow purge valve
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United States of America Patent
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-
Jan 28, 1992
Grant Date -
N/A
app pub date -
Feb 19, 1991
filing date -
Feb 19, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A two-stage high flow purge valve for an evaporative emission system of a vehicle. The valve body contains two valves for controlling fluid flow through separate parallel flow paths in the valve body. A fast-acting, pulse width modulated solenoid valve responsive to an electrical control signal from the engine control computer precisely controls flow through a low flow path, and a vacuum-responsive valve controls flow through a high flow path in accordance with the level of manifold vacuum at the engine intake. A third valve member is provided to block flow through the high flow path when the engine is off and the manifold vacuum is zero. Means for calibrating both the solenoid valve and the vacuum-responsive valves are also provided.
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