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Vehicle low speed warning system

  • US 4,841,276 A
  • Filed: 11/06/1987
  • Issued: 06/20/1989
  • Est. Priority Date: 06/17/1985
  • Status: Expired due to Term
First Claim
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1. In a vehicle slow speed warning system having a means for generating a train of signal pulses at a rate proportional to the vehicle'"'"'s speed, and having a vehicular brake light, the improvement comprising a pulse interval detector comprising:

  • a first monostable multivibrator means responsive to each of said signal pulses for generating a corresponding control pulse of a fixed interval;

    means for comparing the fixed interval of each of said control pulses with the period between the leading edges of said signal pulses to generate a first control signal whenever the pulse rate of said signal pulses drops below a pre-set rate determined by said fixed interval;

    means responsive to said first control signal to generate a second control signal; and

    ,means responsive to said second control signal to apply operating power to said vehicular brake light.

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