US PATENT SUBCLASS 123 / 568.3
.~.~.~ Including auxiliary vacuum pump

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  DF  .~.~ Vacuum actuator control of EGR valve {3}
568.3.~.~.~ Including auxiliary vacuum pump

DEFINITION

Classification: 123/568.3

Including auxiliary vacuum pump:

Subject matter under subclass 568.29 including a supplementary device to evacuate a gaseous fluid from the chamber to create a negative fluid pressure to actuate the EGR closing element.

(1) Note. Many of the supplementary devices are used in conjunction with a diesel engine.