US PATENT SUBCLASS 123 / 352
.~.~.~ Engine speed sensing having an error signal producing circuit

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

319  DF  ENGINE SPEED REGULATOR {16}
349  DF  .~ Having condition responsive means with engine being part of a closed feedback system (e.g., cruise control) {4}
350  DF  .~.~ Electrical sensing or regulating {3}
352.~.~.~ Engine speed sensing having an error signal producing circuit {7}
353  DF  .~.~.~.~> Having variable duty cycle multivibrator (e.g., length of "time on" in each cycle)
354  DF  .~.~.~.~> Having variable frequency multivibrator (e.g., number of "time ons" per unit of time)
355  DF  .~.~.~.~> Having phase difference detector
356  DF  .~.~.~.~> Circuit resonates (e.g., tuned) at governed speed
357  DF  .~.~.~.~> Electric fuel injection pump governor {2}
360  DF  .~.~.~.~> Circuit controls a fluid throttle operator (e.g., vacuum)
361  DF  .~.~.~.~> Circuit controls an electric throttle operator

DEFINITION

Classification: 123/352

Engine speed sensing having an error signal producing circuit:

(under subclass 350) Subject matter in which the regulator employs a specific type or design of circuit to (a) compare the actual engine speed with a desired or preset speed, and (b) produce an output signal when the two speeds are unequal.