US PATENT SUBCLASS 123 / 355
.~.~.~.~ Having phase difference detector

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  DF  .~.~.~ Engine speed sensing having an error signal producing circuit {7}
355.~.~.~.~ Having phase difference detector

DEFINITION

Classification: 123/355

Having phase difference detector:

(under subclass 352) Subject matter in which the error signal producing circuit has means to compare an electrical signal representative of the desired engine speed with an electrical signal representative of the actual engine speed in order to determine if the two signals are coincident in time (in phase) with each other, thereby producing an error signal if the signals compared are found not to be coincident in time (out of phase).