Vacuum generator in combustion engine
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United States of America Patent
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-
Oct 4, 2005
Grant Date -
Sep 23, 2004
app pub date -
Mar 5, 2004
filing date -
Mar 19, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A vacuum generator is provided wherein the intake vacuum of a combustion engine is led to a negative pressure device such as a vacuum booster of a brake booster device through a check valve. An idling air passage is connected to a suction pipe of the combustion engine to bypass a throttle valve arranged in the suction pipe. An ejector is arranged in the idling air passage at the downstream of an idle speed control valve in serial relation to the same, and the intake for idling is performed through the ejector. As the intake air flow passing through the idling air passage increases, the intake negative pressure which is generated at a vacuum takeout port of the ejector is further increased in absolute value, whereby the negative pressure device has a negative pressure which is further increased in absolute value.
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