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Fluid pressure sensor with temperature indication

  • US 4,659,235 A
  • Filed: 04/16/1985
  • Issued: 04/21/1987
  • Est. Priority Date: 04/16/1985
  • Status: Expired due to Term
First Claim
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1. A pressure and temperature sensor for use in a vehicle control system, comprising:

  • a single, pressure-responsive semiconductor diaphragm in which the semiconductor diaphragm material defines a plurality of resistors which change resistance as a function of temperature change, which resistors are interconnected to form a Wheatstone bridge circuit having a pair of input terminals and a pair of output terminals;

    a first output signal circuit, coupled to the bridge circuit output terminals, for providing a first output signal which varies as a function of the pressure applied to the semiconductor diaphragm;

    means for applying an excitation current to the bridge ciruit input terminals;

    a second output signal circuit coupled to the bridge circuit input terminals, for providing a second output signal which varies as a function of the temperature of the pressure-responsive semiconductor diaphragm; and

    means for using the first and second output signals in the vehicle control system.

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