VACUUM PRODUCER INCLUDING AN ASPIRATOR AND AN EJECTOR

摘要

A vacuum producer for supplying vacuum to a device in a boosted engine air system is disclosed. The boosted engine air system includes a throttle. The vacuum producer includes a first engine connection, a second engine connection, an aspirator, an aspirator check valve, an ejector, and an ejector check valve. The first engine connection is fluidly connected to atmospheric pressure and the second engine connection is fluidly connected to the engine air system at a location upstream of an intake manifold of an engine and downstream of the throttle. The aspirator provides vacuum to the device if pressure at the intake manifold is below atmospheric pressure. The ejector provides vacuum if pressure at the intake manifold is above atmospheric pressure.

主权项

1. A vacuum producer for providing vacuum to a device in a boosted engine air system, wherein the boosted engine air system includes a throttle, the vacuum producer comprising:
a first engine connection and a second engine connection, the first engine connection fluidly connected to atmospheric pressure and the second engine connection fluidly connected to the engine air system at a location upstream of an intake manifold of an engine and downstream of the throttle; an aspirator fluidly connected to the device, the first engine connection, and the intake manifold, the aspirator providing vacuum to the device if pressure at the intake manifold is below atmospheric pressure; an aspirator check valve fluidly connected to the aspirator and substantially preventing air from flowing through the aspirator if pressure at the intake manifold is above atmospheric pressure; an ejector fluidly connected to the device, the second engine connection, and the intake manifold, the ejector providing vacuum if pressure at the intake manifold is above atmospheric pressure; and an ejector check valve fluidly connected to the ejector and substantially preventing air from flowing through the ejector if pressure at the intake manifold is below atmospheric pressure.