Measuring and testing – Fluid pressure gauge – Electrical
Patent
1995-06-06
1997-07-29
Chilcot, Richard
Measuring and testing
Fluid pressure gauge
Electrical
324678, 364558, 340451, 731181, G01L 900
Patent
active
056523920
ABSTRACT:
An apparatus for collecting data related to the internal pressure of a fuel tank in a motor vehicle includes an analog pressure transducer that outputs a signal to charge a capacitor to a level proportional to the pressure in the fuel tank of the vehicle. A programmable microprocessor signals a gate to open a communication path between the capacitor and a discharge resistor, then monitors the number of clock counts that occur before the voltage across the discharge resistor drops below a reference voltage. The microprocessor uses the clock count to determine the absolute pressure within the fuel tank and transmits it to a central vehicle computer via a multiplexed data bus system.
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Amrozowicz Paul D.
Chilcot Richard
Chrysler Corporation
Dobrowitsky Margaret A.
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