Instrument cluster integrated bias circuit for fuel level sensor on flex-fuel vehicles

Abstract

The system includes a fuel sender and a controller. The fuel sender has a variable resistance and the variable resistance varies based on the quantity of fuel in the fuel tank. The controller is in electrical communication with the fuel sender. Further, the controller includes a voltage input for sensing a voltage across the fuel sender, and a voltage output that provides a biasing voltage to the fuel sender. The biasing voltage causes the voltage across the fuel sender to vary with relationship to the variable resistance of the fuel sender. Further, the voltage output is in communication with a circuit that is configured to alternate a direction of current flow through the fuel sender based on the voltage output. By alternating the direction of current flow through the fuel sender, corrosion to the fuel sender due to a reaction with the fuel is minimized.

Dependencies are inferred from the claim text.