Self-correction circuit and method for vehicle oil level detection
A technology of oil level detection and voltage detection circuit, which is applied in the direction of liquid level indicator for physical variable measurement, etc., can solve the problems of increasing contact resistance, resistance value and resistance, etc., so as to prolong the service life and save development. Cost, easy-to-achieve effects
Active Publication Date: 2019-05-24
XIAMEN YAXON NETWORKS CO LTD
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Problems solved by technology
However, as the service life of the vehicle becomes longer, the resistance type liquid level sensor is affected by factors such as corrosion and wear, and the external resistance value continues to increase. The main reason is that the contact resistance of the slidable part and the entire resistance contact part becomes larger and the entire resistance itself becomes larger, which will cause the detected oil volume to be larger than the actual oil volume
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[0026] see figure 1 As shown, a self-correcting circuit for vehicle oil level detection includes: a double-pole double-throw electronic switch U4, a liquid level sensor equivalent resistance Rf, a constant current circuit, a voltage detection circuit and an MCU microcontroller U3; The first input terminal B of the double-pole double-throw electronic switch U4 is connected to the output terminal of the constant current circuit, and its second input terminal C is connected to the DC power supply Vcc of the voltage detection circuit through the seventh resistor R7, Its first output terminal A is connected to the pin of the moving piece of the equivalent resistance Rf of the liquid level sensor, and its second output terminal D is connected to the fixed piece pin of the equivalent resistance Rf of the liquid level sensor; The other fixed plate pin of the equivalent resistance Rf of the liquid level sensor is grounded; the first voltage acquisition input terminal ADC1 of the MCU mi...
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The invention discloses a self-correction circuit and method for vehicle oil level detection. The circuit includes a double-pole double-throw electronic switch, a liquid level sensor equivalent resistor, a constant current circuit, a voltage detection circuit and an MCU microcontroller. The double-pole double-throw electronic switch is connected to the constant current circuit, the voltage detection circuit, the MCU microcontroller and the liquid level sensor equivalent resistor to switch a switch state to realize the communication of different ports. The MCU microcontroller controls a workingstate of the double-pole double-throw electronic switch according to a collected voltage value corresponding to the liquid level sensor equivalent resistor to correct the voltage value of the liquidlevel sensor equivalent resistor. The self-correction circuit and method for vehicle oil level detection of the invention are based on the double-pole double-throw electronic switch, the constant current circuit and the voltage detection circuit, and automatically correct the voltage value of the liquid level sensor equivalent resistor through the MCU microcontroller, thereby correctly displayinga vehicle oil level.
Description
technical field [0001] The invention relates to the technical field of on-vehicle oil level detection, in particular to a self-correcting circuit and method for on-vehicle oil level detection. Background technique [0002] Fuel quantity information is the key information displayed by the on-board instrument to the driver, from which the driver can judge the cruising range of the vehicle. Therefore, the detection of the fuel level of the fuel tank is particularly important. If the detection is inaccurate, the driver will make a wrong judgment, causing the vehicle to run out of fuel and stop, which is especially dangerous on the highway. [0003] At present, most of the fuel oil quantity is detected by the liquid level sensor, and the overall structure of the resistive sensor can be regarded as a variable resistor, and different resistance values correspond to different oil level heights. However, as the service life of the vehicle becomes longer, the resistance type liquid...
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IPC IPC(8): G01F23/24
Inventor 陈远兰伟华肖振隆杨磊
Owner XIAMEN YAXON NETWORKS CO LTD