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Travel detecting apparatus

  • US 5,103,413 A
  • Filed: 07/19/1990
  • Issued: 04/07/1992
  • Est. Priority Date: 10/06/1987
  • Status: Expired due to Term
First Claim
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1. An apparatus for periodically detecting and indicating the rate of motion of a vehicle, comprising:

  • means for generating a first pulse signal in response to motion of a vehicle;

    means for measuring a single cycle of the first pulse signal and determining whether the measurement of the single cycle is complete;

    memory means for storing a variety of data relating to tire diameter;

    means for selecting and outputting correction data in accordance with a diameter of a tire of the vehicle from said memory means after a single cycle of the first pulse signal has been measured;

    means for calculating a second pulse signal by calculating a single cycle of the second pulse signal based on a corresponding single cycle of the first pulse signal and the outputted correction data;

    means for determining whether a single cycle of the second pulse signal has been outputted;

    means for checking a single cycle of the second pulse signal to determine whether the single cycle is full;

    means for outputting a single cycle of the second pulse signal after the single cycle has been checked and determined to be full; and

    means for indicating a new rate of vehicle motion in accordance with the outputted single cycle of the second pulse signal.

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