US PATENT SUBCLASS 123 / 521
.~.~.~.~ Responsive to secondary air pressure

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

434  DF  CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29}
518  DF  .~ Having fuel vapor recovery and storage system {1}
519  DF  .~.~ Having an adsorbent canister {1}
520  DF  .~.~.~ Purge valve controlled by engine parameter {1}
521.~.~.~.~ Responsive to secondary air pressure

DEFINITION

Classification: 123/521

Responsive to secondary air pressure:

(under subclass 520) Subject matter wherein the engine parameter controlling the purge valve means is the pressure of the air injected into the engine exhaust, i.e., secondary air pressure.