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Fuel meter

  • US 4,596,216 A
  • Filed: 06/01/1982
  • Issued: 06/24/1986
  • Est. Priority Date: 06/01/1982
  • Status: Expired due to Fees
First Claim
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1. In an internal combustion engine having a plurality of adjustable-volume fuel injectors metering fuel to corresponding ones of engine cylinders at a unit volume rate adjustably responsive to the setting of a manual throttle control comprising a rack gear engaging a pinion gear of each injector for predetermining the volume of an injection chamber thereof, a fuel input line leading to each chamber from a fuel source, a fuel overflow line returning from each chamber to the fuel source and a fuel output line communicating each chamber with a corresponding engine cylinder, the improvement comprising, in combination:

  • monitor means generating an alternating current signal at a frequency related directly to the rotary speed of the engine;

    signal converter means adapted to receive the alternating current signal and converting same to a direct current voltage proportional to the rotary speed of the engine;

    potentiometer means mechanically linked to the rack gear for linearly tracking the lateral displacement thereof, the potentiometer means having a pair of terminals connected to the signal converter means to receive the direct current voltage as a source of operating voltage and a slider terminal at which is generated a quotient signal representing the direct current voltage divided by the lateral displacement of the rack gear which is proportional to the precise unit volume fuel charge of one injector;

    multiplier means having an input connected to the slider terminal and an output generating a signal corresponding to the product of the quotient signal and a constant multiplier representing the number of working engine cylinders;

    first display means coupled to the multiplier means and responsive to the output signal for displaying a precise rate of engine fuel consumption;

    a calibration potentiometer having a pair of terminals connected across the output of the multiplier means;

    a voltage to frequency converter having an input connected to a slider terminal of the calibration potentiometer and an output producing a high frequency alternating current signal related to the magnitude of the voltage at the slider terminal;

    a binary counter adapted to receive the high frequency alternating current signal and to divide down same to a predetermined rate corresponding to the quantity of fuel consumed; and

    second display means coupled to the binary counter and responsive to the divided signal for displaying the quantity of fuel consumed.

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