Vacuum sustaining valve

Details Vacuum sustaining valve Vacuum sustaining valve

1995-02-27

1996-07-09

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

137907, F02M 2507, G05D 1606

Patent

active

055334881

ABSTRACT:
A vacuum sustaining valve (VSV) for temporarily sustaining at least some engine intake manifold vacuum to an EGR valve when engine intake manifold vacuum falls below a predetermined value. The VSV has an inlet port, an outlet port, and a flow path between the two ports. A check valve is disposed with the flow path and is selectively positioned in accordance with manifold vacuum. When manifold vacuum is above a predetermined magnitude, the check valve is positioned to allow bi-directional flow between the two ports. When manifold vacuum is below the predetermined magnitude, the check valve is positioned to function as a check that allows vacuum to pass from the inlet port to the outlet port, but not in the opposite direction.

REFERENCES:
patent: 4030460 (1977-06-01), Tanaka et al.
patent: 4100894 (1978-07-01), Tamura
patent: 4195605 (1980-04-01), Weathers et al.
patent: 4241751 (1980-12-01), Nonoyama et al.
patent: 4267809 (1981-05-01), Mase et al.
patent: 4651766 (1987-03-01), Ransom

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