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Vehicle-velocity calculating apparatus

  • US 6,220,085 B1
  • Filed: 08/07/1997
  • Issued: 04/24/2001
  • Est. Priority Date: 08/07/1996
  • Status: Expired due to Fees
First Claim
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1. A vehicle-velocity calculating apparatus, comprising:

  • first means connectable to an output of a power line of a vehicle for obtaining a signal corresponding to a frequency or period of a pulsating component generated in said vehicle'"'"'s generator which appears at said output, said first means including a counter; and

    second means for obtaining from an output signal of said first means a signal corresponding to an operating velocity of said vehicle, said second means including a differentiating circuit for differentiating an output signal from said counter with respect to time.

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