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US 10,704,477 B2Granted
Method for crankcase ventilation in a boosted engine
AssigneeFord Global Technologies, LLC
InventorsRoss Dykstra Pursifull, Mark Steadman, Katherine Jane Brewer
Life of this patent
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Abstract
Methods and systems are provided for enhancing crankcase ventilation in a boosted engine. During boosted conditions, a crankcase may be ventilated via vacuum generated at an aspirator coupled in a compressor bypass passage. However, when the aspirator is plugged, pressure in the crankcase may be relieved by flowing crankcase gases through an aspirator bypass passage.
Claims13
A method for a boosted engine, comprising:
- during a first condition,
- generating vacuum at an aspirator positioned in a compressor bypass passage;
- using the vacuum to draw gases from a crankcase;
- and
- reducing a pressure in the crankcase;
- and
- during a second condition,
- reducing the pressure in the crankcase by drawing vapors from the crankcase, through an aspirator bypass passage, and into an intake passage.
5 more elements
A method for a boosted engine, comprising:
- during a first condition,
- generating vacuum at an aspirator positioned in a compressor bypass passage;
- and
- drawing vapors from a crankcase using the vacuum generated at the aspirator;
- and
- during a second condition,
- adjusting an opening of an air induction system (AIS) throttle to generate AIS vacuum;
- and
- drawing vapors from the crankcase with the AIS vacuum through an aspirator bypass passage.
6 more elements
Dependencies are inferred from the claim text.