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digital fuel level and tach gauge
The digital fuel level gauge shows the fuel remaining by the mileage and the number of lights on the dial. The more cruising range or the number of lights on the dial, the more fuel is left, and the lower the number of cruising range or the number of lights on the dial is 1-2, it means that the fuel is low and needs to be replenished in time. However, the digital oil gauge will be inaccurate.The fuel system is mainly composed of four parts: the fuel gauge, the sensing circuit, the variable resistor and the buoy. If the fuel tank is full, the resistance value of the variable resistor connected to one end of the buoy becomes smaller, and the current of the entire circuit reaches the maximum value. The pointer will be at the highest position, but when the fuel decreases, the resistance value of the variable resistor increases, the circuit current decreases, and the fuel gauge pointer will decrease accordingly.
Most of the design of the car tachometer is the same. Usually, the indication of the tachometer is multiplied by 1000 or 100 to get the engine speed per minute. There are several areas on the tachometer. The white scale area indicates that the current speed of the car is within the safe speed range, while the red scale area indicates the dangerous speed range. Some models also have a green area, which represents the economic range.
1.The ordinary engine idles at 1000 rpm and starts at 1500 rpm.
2.The tachometer can be divided into several areas, the white scale area is the safe speed range, and the red scale area is the dangerous speed range.
3.The car tachometer has the following advantages: large static torque, the pointer is not easy to shake, and the expansibility is strong: the car tachometer can intuitively understand the working condition of the engine.
The tachometer works according to the principle of magnetism. It receives the pulse signal generated when the primary current in the ignition coil is interrupted, and converts this signal into a displayable speed value. The faster the engine revs, the more pulses the ignition coil generates, and the meter The larger the speed value displayed above.
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