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Auto economy gauge

  • US 4,166,382 A
  • Filed: 03/27/1978
  • Issued: 09/04/1979
  • Est. Priority Date: 03/27/1978
  • Status: Expired due to Term
First Claim
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1. For use in vehicles having an internal combustion engine with an intake manifold, a system for permitting a driver of the vehicle to evaluate whether he is operating the vehicle in a fuel-efficient manner, the system comprising:

  • means forming an independent undivided closed volume chamber separate from the intake manifold;

    means connecting the closed volume chamber and the intake manifold to permit fluid flow between the closed volume chamber and intake manifold including;

    a fixed orifice to meter fluid flow between the closed volume chamber and the intake manifold, said closed volume chamber being open to said intake manifold only through said orifice;

    differential pressure detecting means for detecting differential pressures across the fixed orifice; and

    display means for visually displaying a direct indication of the differential pressure detected across said fixed orifice.

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