US PATENT SUBCLASS 123 / 406.48
.~.~.~ With exhaust gas recirculation (EGR) control

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

406.11  DF  SPARK IGNITION TIMING CONTROL {5}
406.12  DF  .~ Electronic control {10}
406.45  DF  .~.~ Including control of combustible mixture or a constituent thereof (e.g., air, fuel, exhaust gas) {3}
406.48.~.~.~ With exhaust gas recirculation (EGR) control

DEFINITION

Classification: 123/406.48

With exhaust gas recirculation (EGR) control:

(under subclass 406.45) Subject matter wherein the regulating

means to vary spark ignition timing further varies either (a) the returning of the products of combustion exhausted from the engine combustion chamber (i.e., exhaust gas recirculation (EGR)) either (1) to a passage in communication with an inlet port of the combustion chamber (i.e., an intake manifold) or (2) directly to the combustion chamber for subsequent re-burning or (b) regulates the amount of the products of combustion which are retained in the combustion chamber for re-burning during a successive combustion event (i.e., internal exhaust gas recirculation).

SEE OR SEARCH THIS CLASS, SUBCLASS:

568.21+, an internal combustion engine charge forming device having exhaust gas used with the combustible mixture and electrical actuator control.

SEE OR SEARCH CLASS

701, Data Processing: Vehicles, Navigation, and Relative Location,

108, for a digital or programmed data processing system associated with an internal combustion engine, designed to control the air/fuel ratio or fuel injection to change the exhaust gas system, where significant details of the mechanical construction of the component or subsystem within a vehicle are not claimed.