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gasoline fuel tank level gauge
The working principle of the gasoline fuel tank level gauge is to use the capacitance of the capacitor to measure the oil quantity with the change of the tank level. It is composed of capacitance sensor and servo indication system. The sensor is a capacitor composed of several concentric cylindrical plates, which is vertically inserted into the oil tank. The dielectric coefficient of fuel is greater than that of air. When the fuel height in the tank changes, the capacitance also changes accordingly, which is converted into corresponding electrical signals by the servo indication system to indicate the corresponding fuel quantity. The capacitance meter is an electromechanical instrument. It is an instrument widely used by the army at present. The sensor is a cylindrical capacitor composed of concentric cylindrical plates. Its principle is based on the single-value function relationship between the capacitance of the cylindrical capacitor and the oil level height. Then, the capacitance corresponding to the oil quantity is converted into the angle of the pointer by the self-balance measuring circuit. The self-balancing measuring circuit is composed of resistance-capacitance bridge, transistor amplifier, two-phase asynchronous motor, reducer, dial and pointer. The basic working process of the fuel gauge is: firstly, the fuel level, flight attitude and mathematical model stored in the tank are measured by the fuel measurement sensor, and the corresponding fuel quantity is calculated. Combine the fuel density measured by the fuel density sensor to obtain the mass of the fuel contained in the fuel tank. The fuel measurement mission computer transmits the fuel quality to the cockpit display system and the flight management mission system through the data bus. The pointer type fuel gauge is divided into combined type and separated type. The combination instrument is very common in the motorcycle and consists of a fuel meter, a tachometer, an odometer, a water temperature meter and a charging ammeter. The vertical oil gauge consists of a single oil gauge, which is common in antique models and Venza motorcycles.
Normal use with sensorGenerally, due to the irregularity of the fuel tank, the resistance of the rheostat changes irregularly.
The sensing part of the automobile oil level sensor is a coaxial container. When the oil enters the container, the capacitance between the sensor shell and the sensing electrode will change. Through circuit conversion, accurate linearity and temperature compensation will be carried out, and 4-20mA standard will be output, and the signal source will be displayed on the instrument.
The oil level sensor uses the capacitance formed between the probe and the container to change linearly with the liquid level, and converts the change of the liquid level into a linear output, which can directly display the liquid level or send it directly to the remote monitoring system through wireless transmission. The same sensor can replace the measuring medium or change the installation environment at any time. It can automatically adapt and accurately measure without re-calibration, and is not affected by the change of dielectric constant and temperature.
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