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US 5,635,621 AGranted
Apparatus for calibrating a fuel level detector
AssigneeChrysler Corporation
InventorJohn C. Lawson
Life of this patent
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Abstract
A method of calibrating a fuel level detector includes the steps of providing a first capacitor and second capacitor in electrically operable relation to a resistive member; charging the capacitors in free air; recording the discharge cycle of each of the capacitors through the resistive member as free-air clock counts; determining a free-air ratio of the two capacitors by comparing their free-air clock counts; then calibrating the fuel level detector by adjusting one of the capacitive values by a factor of said free-air ratio.
Claims1
A method of calibrating a fuel level detector, comprising the steps of:
- a) providing first capacitive sensor having a first capacitive value and a second capacitive sensor having a second capacitive value, each said sensor in electrically operable relation to a resistive member;
- b) charging said first and second capacitive sensors in free air;
- c) recording the discharge cycle of said first capacitive sensor through said resistive member as a first free-air clock count;
- d) recording the discharge cycle of said second capacitive sensor through said resistive member as a second free-air clock count;
- e) determining a free-air ratio of said first and second capacitive sensors by comparing said first and second free-air clock counts;
- and
- f) calibrating said fuel level detector by adjusting one of said first and second capacitive values by a factor of said free-air ratio.
4 more elements
Dependencies are inferred from the claim text.