how to use tachometer

• 2022-01-07

At present, there are basically only two types of automobile tachometers, one is mechanical tachometer, and the other is liquid crystal display tachometer. These two types of tachometers are only one form and one type of manufacturing. The specific functions are the same. They are visually observing the digital pulse signal transmitted by the engine through the sensor, and then expressed through the tachometer, This can better provide driving assistance for the driver.

Almost all cars have an engine tachometer on the dashboard, but many people don't know what the real function of the tachometer is. In fact, this tachometer plays a very important role. From it, we can see the working state of the engine and the tacit understanding between the engine and the gearbox. It can be said to be a barometer of the working state of the car. At the same time, speed is also one of the most important parameters of the engine. Various characteristics of the engine are directly related to speed, such as speed characteristics, load characteristics and universal characteristics. The idle speed, maximum speed and economic speed range of the engine are closely related to the daily use of the vehicle. Correct control of the engine speed can better and more reasonably control the vehicle. Therefore, for those models with reduced tachometers, I can only ha ha. If such important parameters are not displayed on the instrument panel, how can the car be used reasonably?

So how do we check the tachometer in our daily use? First, always observe whether the engine can run smoothly at each speed. For example, whether the engine speed is stable at idle speed, whether the speed is high or low, whether the engine speed climb is stable and smooth at acceleration, whether the engine speed falls steadily at deceleration, whether the maximum engine speed is too low, and so on. These parameters can reflect the working state of the engine. For example, unstable idle speed indicates dirty throttle or ignition system failure. Low maximum speed indicates that the engine performance has decreased, which may be due to excessive fuel supply system or mechanical wear.

Secondly, you can check the gear shift of the transmission through the tachometer. For manual models, you can also switch gears according to the tachometer and select the appropriate shift time. For automatic models, when the transmission is upshifted, the engine speed will decrease, and when the transmission is downshifted, the engine speed will increase. We can judge whether the transmission works normally by checking the shift speed of the transmission. For example, if the shift speed is too high, the gearbox may be in sports or manual mode, or the engine power may be insufficient; The shift speed is too low, the transmission may be in economy mode, etc.