Vacuum creation system having an ejector, pneumatic control valve and optionally an aspirator
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United States of America Patent
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Jul 17, 2018
Grant Date -
Dec 3, 2015
app pub date -
May 29, 2015
filing date -
May 30, 2014
priority date (Note) -
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Abstract
Ejector assemblies and engine systems have a pressure regulator in fluid communication with an ejector. The pressure regulator receives boost pressure and selectively allows the boost pressure to pass through a valve opening therein under selected engine conditions and into the ejector as regulated boost pressure. Both the pressure regulator and the ejector each have a conduit defining a passageway that includes a Venturi gap separating the passageway into a converging section and a first diverging section that both narrow toward the Venturi gap. The pressure regulator has a piston operatively connected to a valve mechanism positioned for movement therewith to control the passage of the boost pressure through the valve opening, and the valve mechanism defines a passage therethrough that includes a gradually narrowing portion that is narrower than the valve opening.
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