Measuring and testing – Fluid pressure gauge – Electrical
Patent
1995-06-06
1997-07-29
Chilcot, Richard
Measuring and testing
Fluid pressure gauge
Electrical
G01L 900
Patent
active
056523939
ABSTRACT:
A method for collecting pressure data from a fuel tank in a motor vehicle is achieved by providing an analog pressure transducer in communication with a capacitor, at least one resistor in communication with the capacitor, and a gate to control the communication between the resistor and the capacitor. Software in a microprocessor controller compares the voltage across the resistor to a reference voltage as the capacitor discharges, determines the number of clock counts for which a predetermined relationship exists between the voltage across the resistor and the reference voltage, then consults a table to determine an absolute pressure based on the clock count. The microprocessor transmits the absolute pressure to the central vehicle computer via a multiplex data bus system.
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Amrozowicz Paul D.
Chilcot Richard
Chrysler Corporation
Dobrowitsky Margaret A.
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