VACUUM-ACTUATED WASTEGATE

摘要

Embodiments for vacuum generation are provided. In one example, a method for an engine including a turbocharger having a compressor driven by a turbine comprises generating vacuum via exhaust flow through an ejector, and applying vacuum from the ejector to a wastegate actuator. In this way, vacuum produced via high-pressure exhaust resulting from boosted engine operation may be used to actuate the wastegate valve.

主权项

1. A system for an engine, comprising:
a compressor positioned in an intake passage of the engine and coupled to a turbine positioned in an exhaust passage of the engine; an ejector positioned in an engine exhaust flow path, wherein an inlet of the ejector is positioned in the exhaust flow path upstream of the turbine and an outlet of the ejector is positioned in the intake passage upstream of the compressor; a wastegate valve of the turbine actuated by a vacuum actuator; and a vacuum conduit coupling the ejector to the vacuum actuator.