US PATENT SUBCLASS 123 / 568.29
.~.~ Vacuum actuator control of EGR valve

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

434  DF  CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29}
568.11  DF  .~ Exhaust gas used with the combustible mixture (e.g., emission control Exhaust Gas Recirculation (EGR) valve) {10}
568.29.~.~ Vacuum actuator control of EGR valve {3}
568.3  DF  .~.~.~> Including auxiliary vacuum pump
568.31  DF  .~.~.~> Temperature responsive
568.32  DF  .~.~.~> Having fixed restriction in vacuum line

DEFINITION

Classification: 123/568.29

Vacuum actuator control of EGR valve:

(under subclass 568.11) Subject matter wherein (a)the means to return the products of combustion includes a mechanical device having a closing element that controls fluid flow

through the EGR conduit either by (1) closing the EGR conduit or (2) restricting the EGR conduit by a definite predetermined motion of the closing element, and (b) negative fluid pressure is applied through a passage connected to an expansible chamber and the negative fluid pressure in the chamber is used to actuate the closing element which varies the flow of the products of combustion back to the combustion chamber for subsequent re-burning.