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VEHICULAR PERFORMANCE ANALYZER

  • US 3,853,002 A
  • Filed: 08/06/1973
  • Issued: 12/10/1974
  • Est. Priority Date: 08/06/1973
  • Status: Expired due to Term
First Claim
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1. Performance analyzer for measurement of the performance characteristics of a vehicle comprising:

  • a tachometer circuit means connected to the vehicle which produces a first electrical output signal of a frequency which is proportional to the velocity of the vehicle;

    said tachometer circuit means includes a signal conditioner and monostable multivibrator;

    said signal conditioner being connected to provide said monostable multivibrator with trigger pulses of current;

    a differentiator circuit means connected to said first output signal for providing a second output signal which is representative of the rate of change of said first output signal;

    said differentiator circuit means includes a filter circuit, a differentiator, and an amplifier;

    said filter circuit being connected to said monostable multivibrator which converts the last said signal to a direct current wherein the direct current is proportional to the frequency of said first signal;

    said direct current being connected to said differentiator by a source follower means for improving the response rate of said filter and said differentiator;

    a multiplying circuit means including a transistor which multiplies said first and second output signals together to provide a third output signal representative of the net horsepower of the vehicle;

    said transistor having a base, an emitter, and a collector;

    a single source of power, a means for mesuring;

    said transistor having the base thereof connected to said first electrical signal, the emitter connected to said second electrical signal, and the collector connected to said means for measuring;

    said means for measuring being connected to said single source of power, so that current flow occurs from said power source, through said means for measuring, and to the collector of the transistor.

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