Patent ID: 9638566
Date: 2017-05-02
CPC Classifications: B60K,G01F

Claim:
1. A method for measuring pressurized liquid fuel level in a fuel tank used on an industrial vehicle comprising: measuring the pressure of the fuel to generate a pressure signal; measuring the temperature of the fuel to generate a temperature signal; determining a fuel level signal from said pressure signal and said temperature signal by doing one of: dividing the temperature signal by the pressure signal (T/P) and dividing the pressure signal by the temperature signal (P/T); detecting changes in said fuel level signal over time; identifying a first point of said fuel level signal indicating approaching emptying of the tank when said pressure signal and said temperature signal become uncorrelated so that changes in said fuel level signal exceed a given value; and signaling said approaching emptying of the tank to an operator of the vehicle in response to identifying said first point.