US PATENT SUBCLASS 123 / 339.21-- .~.~.~.~ And integral or derivative control

US PATENT SUBCLASS 123 / 339.21
.~.~.~.~ And integral or derivative control

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

319	DF	ENGINE SPEED REGULATOR {16}
339.1	DF	.~ Idle speed control {5}
339.14	DF	.~.~ Electrically operated control means {6}
339.19	DF	.~.~.~ By engine speed error feedback {4}
339.21		.~.~.~.~ And integral or derivative control

DEFINITION

Classification: 123/339.21

And integral or derivative control:

(under subclass 339.19) Subject matter and wherein the electrically powered adjusting means (a) receives a signal indicative of an engine operating parameter, and (b) either (1) determines on a continuous basis the total value of the parameter being measured as a function of time or (2) determines a rate of change of the parameter being measured as a function of time, and (c) uses the result to vary the minimum engine shaft operating speed.