Structure and Principle of Lcd Digital Speedometer

Mar 04,2022

1. Structure and Principle

The LCD digital speedometer transmits the switching signal of the dedicated Hall sensor to the single chip microcomputer on the LCD instrument assembly, and counts the number of turns of the wheels per unit time, which can calculate the driving speed of the whole vehicle, and the driving speed and driving time. Multiplied together, the accumulated mileage of the vehicle can be calculated.

Some brushless motor controllers also use single-chip microcomputer as the decoding chip, which can directly calculate the motor running speed and accumulated mileage, and send them to the liquid crystal display instrument. There is no single-chip microcomputer in the liquid crystal display instrument assembly.

What the liquid crystal display instrument is best at is the digital and accurate display of various data (such as speed, battery voltage, mileage, riding time, ambient temperature, etc.), so that the operator can see the precise value at a glance, but this kind of instrument The disadvantage is that the anti-ultraviolet radiation ability of sunlight is poor, and the temperature of the operating environment is high, so the liquid crystal display instrument cannot be placed in the sun for a long time, and can only be used at an ambient temperature of -10--40 °C. Using for a long time in a high temperature or low temperature environment will cause irreversible damage to the LCD screen, so that the displayed value of the LCD screen will be blurred until it cannot be displayed.

2. Fault detection and maintenance

The circuit of this kind of instrument is complicated, and the failure rate is relatively high. Some liquid crystal instrument circuits can work independently without relying on the controller circuit, while some liquid crystal instruments must rely on the digital signal of the microcontroller in the controller to work. Due to the software of the display driver and the model of the single-chip microcomputer, once the instrument fails, only the instrument assembly can be replaced. In an emergency, the lead wires of the turning handle and the brake handle can be directly supplied to the controller for use.

Taizhou Yongchang Instrument Manufacturing Co., Ltd. not only has lcd speedometer but also pulsar speedometer and other products, welcome to visit our official website.

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