Method and system for fuel vapor management

摘要

Methods and systems are provided for ventilating a crankcase in an engine. In one example, when the engine is operating boosted under cruising conditions, fuel vapors from the crankcase may flow to each of a compressor inlet and an intake manifold of the engine. In this way, the crankcase may be effectively purged.

主权项

1. A method for a boosted engine, comprising:
during boosted conditions,
generating a vacuum at a first ejector using compressor bypass air flow; andapplying the vacuum to a crankcase to draw fuel vapors into the first ejector; during cruising conditions and while drawing the fuel vapors to the first ejector,
flowing additional fuel vapors from the crankcase to an intake manifold via a crankcase ventilation valve and drawing the additional fuel vapors into a second elector, the second elector coupled across an intake throttle.