US PATENT SUBCLASS 123 / 568.27
.~.~.~.~ Controlling vacuum actuator

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}
568.21  DF  .~.~ Having electrically actuated control means {3}
568.26  DF  .~.~.~ Having electromechanical actuator control of EGR valve {1}
568.27.~.~.~.~ Controlling vacuum actuator {1}
568.28  DF  .~.~.~.~.~> Including auxiliary vacuum pump

DEFINITION

Classification: 123/568.27

Controlling vacuum actuator:

(under subclass 568.26) Subject matter wherein the electrical actuator regulates the position of a fluid flow adjusting means which regulates the flow of a fluid through a passage connected to an expansible chamber of negative fluid pressure and the negative fluid pressure in the chamber is used to actuate the EGR closing element to vary the flow of the products of combustion.

SEE OR SEARCH CLASS

137, Fluid Handling,

907, for a vacuum actuated valve, per se.