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Speed compensated fuel consumption warning device

  • US 3,925,753 A
  • Filed: 02/10/1975
  • Issued: 12/09/1975
  • Est. Priority Date: 02/10/1975
  • Status: Expired due to Term
First Claim
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1. A fuel consumption warning device for use with a vehicle powered by a throttle controlled internal combustion engine having an intake manifold, comprising:

  • a vacuum transducer pneumatically coupled with the intake manifold for generating a vacuum signal having a magnitude progressively changing with a progressively increased manifold vacuum level;

    means for generating a speed signal having a magnitude substantially equal to the difference between the magnitude of the vacuum signal at a manifold vacuum level representing a predetermined excessive fuel consumption at zero vehicle speed and the magnitude of the vacuum signal at a manifold vacuum level representing a predetermined excessive fuel consumption at the instantaneous vehicle speed;

    means combining said speed signal and vacuum signal and generating an output signal when the magnitude of the combined signals differs with a fixed polarity from the magnitude of the vacuum signal at the manifold vacuum level representing the predetermined excessive fuel consumption at zero vehicle speed; and

    an indicator responsive to the output signal for producing an operator observable indication representing excessive fuel consumption at the instantaneous vehicle speed.

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