Hybrid exhaust valve assembly
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United States of America Patent
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Jul 22, 2008
Grant Date -
May 22, 2008
app pub date -
Apr 2, 2007
filing date -
Nov 21, 2006
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An exhaust valve assembly includes a flapper valve fixed to a valve shaft where the flapper valve is movable between a closed position, an intermediate position, and an open position. A resilient member biases the flapper valve toward the closed position. An electric actuator actively moves the flapper valve at least from the closed position to the intermediate position. A coupling mechanism couples the valve shaft to an electric actuator shaft and allows the flapper valve to move to the open position in response to exhaust flow sufficient to overcome a biasing force of the resilient member without requiring input from the electric actuator.
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