Method of controlling aspirator motive flow
AssigneeFord Global Technologies, LLC
InventorsEric Luehrsen, Ross Dykstra Pursifull
Life of this patent
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Abstract
Methods and systems are provided for controlling an aspirator shut-off valve in an engine of a hybrid vehicle. One example method includes opening the aspirator shut-off valve following a shut-down command to the engine when engine speed is between a first engine speed and a second engine speed, the first engine speed being lower than an idle speed and the second engine speed occurring before an imminent engine stop. The example method further includes not opening the aspirator shut-off valve between the first engine speed and the second engine speed if an oxygen content of an emission control device is at or near a threshold.
Claims13
A method for a hybrid vehicle system, comprising:
- following a shut-down command to an engine,
- opening an aspirator control valve (ACV) between a first engine speed and a second engine speed, the first engine speed being lower than an idle speed and the second engine speed occurring before an imminent engine stop;
- and
- closing the ACV when engine speed decreases to below the second engine speed.
A method for an engine in a hybrid vehicle, comprising:
- following a first shutdown command to the engine,
- opening an aspirator shut-off valve (ASOV) between a first engine speed and a second engine speed, the second engine speed being nominally higher than that at an engine stop;
- and
- following a second shutdown command to the engine,
- closing or maintaining closed the ASOV irrespective of engine speed.
Dependencies are inferred from the claim text.