US PATENT SUBCLASS 123 / 568.11
.~ Exhaust gas used with the combustible mixture (e.g., emission control Exhaust Gas Recirculation (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.~ Exhaust gas used with the combustible mixture (e.g., emission control Exhaust Gas Recirculation (EGR) valve) {10}
568.12  DF  .~.~> Exhaust gas cooled during recirculation
568.13  DF  .~.~> Having recirculation path formed entirely in the cylinder block or head
568.14  DF  .~.~> Internal exhaust gas recirculation (e.g., exhaust gas retained in the combustion chamber)
568.15  DF  .~.~> Having exhaust gas mixed with a constituent before entry into intake manifold
568.16  DF  .~.~> With electrical means for fail-safe, backup, or malfunction detecting of EGR system
568.17  DF  .~.~> Having specific exhaust gas outlet structure at intake manifold {1}
568.19  DF  .~.~> EGR valve position controlled only in relationship to intake throttle valve position
568.2  DF  .~.~> Plural EGR valves in the recirculation passage
568.21  DF  .~.~> Having electrically actuated control means {3}
568.29  DF  .~.~> Vacuum actuator control of EGR valve {3}

DEFINITION

Classification: 123/568.11

Exhaust gas used with the combustible mixture (e.g., emission control exhaust gas recirculation (EGR) valve):

Subject matter under subclass 434 wherein the means for forming a mixture of fuel and oxidant is provided with a means to return the products of combustion exhausted from the engine combustion chamber (i.e., exhaust gas recirculation (EGR)) either (a) to a passage in communication with an inlet port of the combustion chamber (i.e., an intake manifold) or (b) directly to the combustion chamber for subsequent re-burning.

(1) Note. Subject matter wherein the exhaust gas is treated before recirculation is found eslewhere. Subject matter wherein the exhaust gas enters the exhaust gas return passage and then it is treated is found in class. See Search Class below.

(2) Note. This and the indented subclasses include disclosures wherein the exhaust gas products are exhausted from one combustion chamber and returned to another combustion chamber.

SEE OR SEARCH THIS CLASS, SUBCLASS:

200+, for rotary engine exhaust gas recirculation.

672+, for a charge forming device having exhaust gas condition responsive control means.

SEE OR SEARCH CLASS

60, Power Plants, 278, and 279 for treatment or handling of the exhaust gas from an internal combustion engine before recirculation to the engine, and subclass 605.2 for recirculating exhaust gas in a turbocharged internal combustion engine with specific turbocharger details.