2.LCD instrument

1. Structure and principle

The switching signal of the dedicated Hall sensor is transmitted to the single-chip microcomputer on the liquid crystal display instrument assembly, and the number of wheel rotations per unit time can be counted, and the driving speed of the whole vehicle can be calculated. The driving speed and the driving time can be multiplied. Calculate the accumulated mileage of the vehicle.

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

Liquid crystal display instruments are best at 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 ability to resist sunlight and ultraviolet radiation is poor, and the use environment temperature is high, so the liquid crystal display instrument can not be placed in the sun for a long time, and can only be used at an ambient temperature of -10--40°C. Long-term use in a high temperature or low temperature environment will cause irreversible damage to the LCD screen, so that the display value of the LCD screen will be blurred until it cannot be displayed.

2. Fault detection and maintenance

The circuit of this type 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, and some liquid crystal instruments must rely on the digital signal of the single-chip microcomputer in the controller to work. As the software of the display driver and the model of the single-chip microcomputer are involved, once this kind of instrument fails, only the instrument assembly can be replaced. In an emergency, the lead wires of the handlebar and brake handle can be directly supplied to the controller for use.