Method and system for vacuum generation
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United States of America Patent
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Feb 23, 2016
Grant Date -
Nov 5, 2015
app pub date -
Apr 30, 2014
filing date -
Apr 30, 2014
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Abstract
Various systems and methods are described for reducing motive flow rate through an aspirator. In one example, a method comprises flowing intake air, heated upon passage through an interstitial space of a double wall exhaust system, through an aspirator coupled to an engine vacuum consumption device to reduce motive mass flow rate at the aspirator as exhaust temperature increases. A position of an intake throttle may be adjusted based on the motive flow rate from the aspirator.
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