US PATENT SUBCLASS 123 / 568.19
.~.~ EGR valve position controlled only in relationship to intake throttle valve position

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}
568.19.~.~ EGR valve position controlled only in relationship to intake throttle valve position

DEFINITION

Classification: 123/568.19

EGR valve position controlled only in relationship to intake throttle valve position:

(under subclass 568.11) Subject matter where the engine includes (a) a closing member that regulates fluid flow through the intake manifold leading to the combustion chamber, (b) the EGR conduit includes a closing element that

regulates fluid flow through the EGR conduit, and (c) wherein the motion of the closing element is related only to the position of the closing member.

(1) Note. There does not have to be a linear relationship between movement of the intake throttle valve and the EGR valve for proper placement in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

319+, for specific intake throttle valve control.

337, for specific intake throttle valve structure.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation, appropriate subclasses, for specific valve structure.