Fuel meter for vehicles
A fuel level meter for vehicles is described including an electrical measuring device comprising: a voltage source and a potentiometer resistor. The resistor comprises two ends connected between the voltage source and a movable contact, connected to a float disposed in a fuel tank, such that the position of the float is dependent on the level of fuel in the tank; a shuntable series resistance with a first side connected to the movable contact and to a first relay switch of a relay and a second side connected both to a first resistor and to the relay switch. The other side of the first resistor is connected to a first side of a rheostat and to an overvoltage protector means; a damping capacitor having one side connected between the relay switch and a second relay switch of the relay operable jointly with the first. The measuring device is connected between a second side of the rheostat and ground; wherein the relay switches are jointly movable between a position wherein a first side of the capacitor and the second side of the shuntable series resistance are both electrically connected to an input terminal of the measuring device such that a current flowing from the movable contact flows through the series resistor and the other side of the capacitor is coupled to a constant voltage, and a second position wherein the series resistance is shunted off, the overvoltage protector means is engaged in parallel with the measuring device, and the capacitor maintains the constant voltage.
- Assignee:
- AB Volvo, Gothenburg
- Patent Number(s):
- US 4699003
- OSTI ID:
- 5762695
- Resource Relation:
- Patent File Date: Filed date 23 Jan 1985
- Country of Publication:
- United States
- Language:
- English
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