By-pass valve

Details By-pass valve By-pass valve

1979-01-15

1981-03-24

Koczo, Jr., Michael

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

251 33, 251 613, F01N 322

Patent

active

042572282

ABSTRACT:
A by-pass valve (1) for use in the exhaust system of an internal combustion engine has an improvement comprising control means (69) responsive to engine vacuum for exposing a chamber (27) to engine vacuum, the control means being responsive to an abrupt change in engine vacuum such as occurs during engine decelerations for spoiling the vacuum in the chamber and causing a vacuum responsive means (19) to close a first valve (15) and open a second valve (17). The control means reestablishes the vacuum in the chamber after a predetermined time interval and causes the vacuum responsive means to open the first valve and close the second valve, the controlled closing and opening of the first and second valves preventing engine backfires. The control means includes second means (117) responsive to engine vacuum for spoiling the vacuum in the chamber so long as engine vacuum exceeds a predetermined level whereby the first valve is kept closed and the second valve is kept open by the first vacuum responsive means.

REFERENCES:
patent: 3751916 (1973-08-01), Hayashida
patent: 4050249 (1977-09-01), Collins
patent: 4174610 (1979-11-01), Hollis

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