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Method and apparatus for instantaneously measuring and indicating fuel consumption rate

  • US 4,054,781 A
  • Filed: 12/15/1975
  • Issued: 10/18/1977
  • Est. Priority Date: 01/07/1975
  • Status: Expired due to Term
First Claim
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1. An apparatus for instantaneously measuring fuel consumption rate comprising:

  • measuring means, responsive to at least two operating parameters of an engine mounted on a vehicle, for indirectly measuring fuel amount consumed by the engine to generate a fuel signal indicative thereof, said measuring means including a pulse generating circuit which includes a flip-flop having first and second input terminals and first and second output terminals and a voltage comparator, one input terminal of said flip-flop receiving an input signal indicative of one operating parameter of the engine, one output terminal of said flip-flop being connected, through an integrator circuit having a capacitor, to one input terminal of said voltage comparator, the other input terminal of said voltage comparator receiving another input signal indicative of another operating parameter of the engine, an output terminal of said voltage comparator being connected to the other input terminal of said flip-flop, and the fuel signal being generated at the other output terminal of said flip-flop;

    a speed sensor for detecting running speed of said vehicle and generating a speed signal proportional thereto;

    a first circuit connected to said measuring means for integrating said fuel signal and generating an output signal indicative of a predetermined fuel consumption;

    a second circuit connected to said speed sensor and said first circuit for integrating said speed signal controlled by said output signal and for generating an output signal directly proportional to running distance and inversely proportional to fuel amount consumed; and

    indicating means connected to said second circuit for indicating fuel consumption rate in response to said output signal of said second circuit.

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