US PATENT SUBCLASS 701 / 108
.~.~.~.~.~ Exhaust gas circulation (EGC)

Current as of: June, 1999
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701 /   HD   DATA PROCESSING: VEHICLES, NAVIGATION, AND RELATIVE LOCATION

1  DF  VEHICLE CONTROL, GUIDANCE, OPERATION, OR INDICATION {19}
99  DF  .~ With indicator or control of power plant (e.g., performance) {2}
101  DF  .~.~ Internal-combustion engine {1}
102  DF  .~.~.~ Digital or programmed data processor {7}
103  DF  .~.~.~.~ Control of air/fuel ratio or fuel injection {6}
108.~.~.~.~.~ Exhaust gas circulation (EGC)

DEFINITION

Classification: 701/108

Exhaust gas circulation (EGC):

(under subclass 103) Control system wherein the air/fuel ratio or fuel injection is controlled in response to a change in the exhaust gas system.

SEE OR SEARCH CLASS

123, Internal-Combustion Engines,

568.21+, for the electrical control of an e.g.r. valve for a charge forming device and subclasses 672+ for a charge forming device including an exhaust gas sensing means.