US PATENT SUBCLASS 123 / 339.1
.~ Idle speed control

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

319  DF  ENGINE SPEED REGULATOR {16}
339.1.~ Idle speed control {5}
339.11  DF  .~.~> By regulating spark ignition timing
339.12  DF  .~.~> And air-fuel ratio feedback controlled
339.13  DF  .~.~> Manual adjustment
339.14  DF  .~.~> Electrically operated control means {6}
339.29  DF  .~.~> By overriding injection pump governor

DEFINITION

Classification: 123/339.1

Idle speed control:

(under subclass 319) Subject matter (a) wherein the output shaft has a varied minimum operating speed, and (b) comprising a manual input member and means for adjusting the minimum operating speed of the shaft while maintaining the

manual input member (e.g., accelerator pedal, hand control) at a minimum position.

(1) Note. An engine idle speed control responsive to a signal indicative of an engine operating condition or indicative of an external load applied to the engine (e.g., power steering pump, lights, electric generator) is provided for here.

SEE OR SEARCH CLASS

290, Prime-Mover Dynamo Plants, appropriate subclasses, especially

40+, for engine idle speed control responsive to a sensed parameter of an electric generator.

477, Interrelated Power Delivery Controls, Including Engine Control, appropriate subclasses, especially

34+, for an engine idle speed control responsive to a signal indicative of a transmission, clutch, or brake condition.