Vehicle oil level sensor and implementation method thereof

Abstract

The invention discloses a vehicle oil level sensor and an implementation method thereof. The vehicle oil level sensor comprises an oil tank, a slide rheostat, a first resistor, a second resistor, an ECU (electronic control unit) and an instrument, wherein the ECU comprises two analog-digital converters, a V1 sampling module, a V2 sampling module, a V1 backup module, a V2 backup module, a V1 diagnosis module, a V2 diagnosis module, two computing units, a Rm backup module, a Rm default module, a Rm diagnosis module and a filter. The invention also discloses an implementation method of the vehicle oil level sensor. By adopting the vehicle oil level sensor and the implementation method thereof provided by the invention, two voltage inputs V1 and V2 can be collected and the fuel oil volume in the oil tank can be obtained by calculation, thus interference of the contact resistance of the slide rheostat can be eliminated as much as possible and a more accurate calculated result can be obtained.

Description

technical field [0001] The invention relates to an oil level detection device and a detection method of a motor vehicle 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 10, a sliding rheostat 20, a resistor 22, an ECU (Electronic Control Unit) 30 and an instrument 40. Wherein the height of the fuel tank 10 (the height of the accommodating space where the fuel is held) is H, and the height of the fuel is H m . There is a float 11 in the fuel tank 10 floating on the fuel surface. One end of the sliding rheostat 20 is grounded, and the other end is connected to a voltage V through a series connected resistor 22 . The total resistance of the sliding rheostat 20 is R, and the variable resistance...

AI Technical Summary

Problems solved by technology

Considering the contact resistance R e Afterwards, through V m Calculate R m The formula is: R e 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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