Intake system including vacuum aspirator

摘要

In some examples, reduced engine displacement reduces an engine's ability to provide brake booster vacuum. The present application relates to intake systems including a vacuum aspirator to generate vacuum.

主权项

1. An intake system comprising:
a throttle positioned downstream of a compressor, the throttle comprising a first inlet, a second inlet, and a plate, the plate located intermediate the first inlet and an outlet, the second inlet located intermediate the throttle plate and the first inlet, the throttle positioned in an intake passage; an aspirator having a motive inlet in communication with the intake passage downstream of the compressor and upstream of the throttle, the aspirator having an outlet in communication with the second inlet of the throttle, the aspirator having an entraining inlet in communication with a vacuum reservoir via a first check valve, the first check valve limiting flow from the second inlet to the vacuum reservoir; and a controller including a physical memory with instructions for closing the throttle during idle airflow; wherein the throttle is the only valve controlling flow from the intake passage through the aspirator to an intake manifold and flow from the intake passage to the intake manifold bypassing the aspirator.