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Input circuit for an electronic vehicle speed control unit

  • US 4,608,954 A
  • Filed: 04/23/1984
  • Issued: 09/02/1986
  • Est. Priority Date: 04/23/1984
  • Status: Expired due to Fees
First Claim
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1. An input circuit to an electronic speed control unit for a vehicle having an ignition system adapted to generate pulses of electrical current at a frequency proportional to engine speed comprising:

  • means responsive to each ignition system current pulse for generating a voltage differential signal;

    biasing means for generating bias signals defining a predetermined voltage differential range;

    differential amplifier means connected to said voltage differential signal generating means and said biasing means for generating an output signal when said voltage differential signal exceeds said predetermined voltage differential range; and

    capacitive means connected to said voltage differential signal generating means for rejecting common mode signals superimposed on said voltage differential signal.

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