Back to results
US 2015/0316003 A1Published application
Method and system for vacuum generation
AssigneeFord Global Technologies, LLC
InventorsJoseph Norman Ulrey, Ross Dykstra Pursifull
Life of this patent
Estimating the term…
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.
Claims20
A method for an engine, comprising:
- 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 method for an engine, comprising:
- flowing intake air through an interstitial space of a double wall exhaust system, and then through an aspirator before delivering the air to an intake manifold;
- and
- during a first idling condition, when exhaust temperature is higher, feed-forward adjusting an intake throttle to a more open position during the flowing;
- and
- during a second idling condition, when the exhaust temperature is lower, feed-forward adjusting the intake throttle to a more closed position during the flowing.
2 more elements
A system for an engine, comprising:
- an engine intake manifold;
- an intake throttle;
- a boost device;
- an exhaust system having a double wall exterior defining an interstitial space;
- a conduit coupling the interstitial space to the intake manifold downstream of the boost device and the intake throttle;
- an un-valved aspirator positioned in the conduit, the aspirator coupled to a vacuum consumption device;
- and
- a controller configured with computer readable instructions stored on non-transitory memory to:
- during an engine cold-start,
- draw intake air into the interstitial space from upstream of the intake throttle;
- flow intake air heated upon passage through the interstitial space through the aspirator;
- draw a vacuum at the aspirator;
- and
- adjust a position of the intake throttle based on an amount of airflow through the aspirator, the amount of airflow estimated based on exhaust temperature during the engine cold-start.
11 more elements
Dependencies are inferred from the claim text.