METHOD AND SYSTEM FOR VACUUM GENERATION

摘要

Methods and systems are provided for controlling motive flow through an ejector using a pneumatically controlled valve. A vacuum actuated valve may be opened at low vacuum conditions to increase motive flow through the ejector while the valve is closed at high vacuum conditions to decrease the motive flow. This allows motive flow through the ejector to be controlled based on vacuum needs at low component cost.

主权项

1. A method for an engine, comprising:
opening a vacuum-actuated valve responsive to a vacuum level at a vacuum reservoir to vary a motive flow through an ejector coupled across an intake throttle, the valve coupled upstream of the ejector.