Oil level detection device and detection method for fuel oil tank

Abstract

The invention discloses an oil level detection device and detection method for a fuel oil tank. The oil level detection device for the fuel oil tank comprises the fuel oil tank, a slide rheostat, a first resistor, a second resistor, an ECU and a meter; a floater floats on the surface of fuel oil in the fuel oil tank and is connected with a slide sheet of the slide rheostat, one end of the slide rheostat is connected with voltage V through the first resistor connected in series, the slide sheet of the slide rheostat is grounded through a second resistor connected in parallel, the end, connected with the first resistor in series, of the slide rheostat is connected to the ECU and outputs the voltage V1, the other end of the slide rheostat is connected to the ECU and outputs the voltage V2, and the meter is connected to the output end of the ECU. According to an oil level sensor used for a car and the implementation method thereof, two ways of the voltage V1 and V2 are collected and input, the fuel oil capacity in the fuel oil tank is obtained through calculation, the interference of contact resistance of the slide rheostat is eliminated, and the more accurate calculation result can be obtained.

Description

technical field [0001] The application relates to a fuel level detection device and a detection method of a fuel tank. Background technique [0002] The vehicle fuel level sensor provides the driver with information on the amount of fuel in the fuel tank of the motor vehicle, so that the driver can refill the fuel in good time before the fuel is exhausted. [0003] see figure 1 , the existing vehicle oil level sensor includes a fuel tank 13, a sliding rheostat 10, a resistor 12, an ECU (Electronic Control Unit) 15 and an instrument 16. Wherein the height of the fuel tank 13 (height of the accommodating space for containing the fuel) is H, and the height of the fuel is Hm. There is a float 14 floating on the fuel surface in the fuel tank 13 . One end of the sliding rheostat 10 is grounded, and the other end is connected to a voltage V through a series resistor 12 . The total resistance of the sliding rheostat 10 is R, the variable resistance obtained by the sliding piece ...

AI Technical Summary

Problems solved by technology

After considering the contact resistance Re, the formula for calculating Rm from Vm is: It is difficult to measure, so the actual calculation of the effective resistance of the sliding rheostat includes the contact resistance, which will cause the calculated oil volume Vol to be lower than the real oil volume

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