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List of the contents of this article:

• 1,Trade data-driven warehousing decisions What is the reason why the speedometer of the car doesn't move?
• 2, How does the car speedometer work?
• 3, car speedometer and actual speed
• 4, What is the difference between a speedometer and a tachometer in a car?
• 5. How to distinguish the speedometer and tachmeter of the car

What is the reason why the speedometer of the car doesn't move?

The reason why the speedometer does not move is that the speed sensor of the motor vehicle is damaged; the wiring of the transmission is damaged; the connection between the speedometer of the vehicle and the gearbox is loose.

The reasons are as follows: 1 Most of the reasons are damage to the speed sensor. 2 The connection wire of the transmission may be broken. 3 It is most likely that there is a problem with the iron. The card at the connection of the 4-way code meter and the gearbox is loose.

There are many reasons: the speed sensor of the vehicle has failed.There is a short circuit or virtual connection and looseness in the connection line behind the LCD dashboard. Caused by the failure of the LCD dashboard itself. If the driving computer of the vehicle fails, it will cause the speed to not move.

The speed sensor and sensor drive mechanism failed. Speed meter failure (speed meter) failure. The sensor and the speedometer connection line speed or mechanism failed. High-end vehicles may be related to the vehicle travel computer. For the vehicle model, a diagnostic instrument can be used to detect, and the fault point can be easily judged.

It may be that the speed meter of the vehicle's instrument assembly has failed, causing the pointer of the meter to not rotate. It may be that the speed sensor of the vehicle has failed, causing the meter to not turn. It may be that the mileage sensor of the vehicle has failed, causing the meter to not turn.

How does the car speedometer work?

1. The principle of the car speedometer is: when the car is running, the drive shaft rotates with the permanent magnet, and the magnetic line of the permanent magnet generates eddy current on the aluminum bowl. The eddy current interacts with the magnetic field of the permanent magnet to generate torque, overcome the elasticity of the disc spring, and make the aluminum bowl rotate at an angle with the pointer.The function of the speedometer is to indicate the driving speed and the cumulative mileage.

2. Working principle: When the car is running, the active shaft rotates with a permanent magnet, and the magnetic line of the permanent magnet produces a eddy current on the aluminum bowl. The eddy current interacts with the magnetic field of the permanent magnet to generate a torque to overcome the elastic force of the disc spring, so that the aluminum bowl is deflected in the direction of permanent magnet rotation, so the aluminum bowl is Turn the pointer at an angle.

3. That is, the working principle of the differential: when the car goes straight, the two planetary gears only rotate in the same way, not in the same. According to the principle of mechanics, the inner wheel is bound to rotate slower when turning. At this time, the speed of the drive shaft remains unchanged, and the planetary wheel rotates around the semi-axis at this time.

Car speedometer and actual speed

1. When the speed is displayed on the dashboard as 100 kilometers per hour, the speed may actually be about 97 kilometers per hour. The so-called positive error means that the measured value is never less than the actual value, that is to say, the reading of the speedometer can be equal to the actual value or greater than the actual value, but it must not be less than the actual value.

2. When the dashboard shows that the speed is 100 kilometers per hour, the speed may actually be about 97 kilometers per hour. The so-called positive error means that the measured value is never less than the actual value, that is to say, the reading of the speedometer can be equal to the actual value or greater than the actual value, but it must not be less than the actual value.

3. When we drive a car, we often find that the speed shown by the vehicle is much faster than the actual speed. This is because the speedometer on the car dashboard is not accurate, but calculated based on some hypothetical and theoretical models.Therefore, there is a certain difference between the display speed and the actual speed.

What is the difference between a speedometer and a tachometer in a car?

1. Different representative functions. The tachometer refers to the engine speed, that is, the speed per minute of the engine crankshaft, which can better reflect the condition of the engine, so it is represented in RPM. But the speedometer represents the speed of the car, so its unit is kilometers per hour.

2. The tachometer represents the speed of the engine crankshaft, and the speedometer represents the speed of the car. The unit of the tachometer is rpm, and the unit of the tanometer is kilometer per hour. The information displayed in these two tables is completely different.

3. Different units. The speedometer is in the most prominent position of the dashboard, indicating the current speed of the car, the unit is km/h, and the total mileage and short-distance mileage, the unit is km, of which the total mileage cannot be changed, and the one-way mileage can be set to zero as needed. And the tachometer is measured in x1000r/min.

4. The tachometer is the speed of the engine. The speed of a civilian vehicle is generally very good at most six or seven thousand rpm. F1 racing cars can easily reach 178,000 rpm, so F1 racing cars are easy to accelerate to more than 200 kilometers. That is to say, the faster the rotation speed, the faster the speed.

How to distinguish the speedometer and tachometer of the car

Speedometer: speedometerIt is composed of a speedometer indicating the speed of the car and an odometer that records the distance traveled by the car. The dial is a speedometer, the unit is km/h, indicating 2-3 digits; below the middle is the odometer.

The other is a car and the other is a speedometer, and the unit is km/h. The speedometer indicates the speed of the vehicle, which shows the instantaneous speed, which is also the reason why the pointer shakes. You will understand the principle of the speedometer.

Hello, the tachometer indicates the speed of the engine, while the speedometer represents the speed of the vehicle! When the vehicle is stationary, as long as the engine is running, the tactometer will move, but the speedometer will not move! I hope I can help you! I wish you a happy use of the car! [ For car questions, ask the car master.

Generally, the tachometer indicator is multiplied by 1000 or 100, which is the engine speed per minute. For example, the engine is generally 700-1100r/min at idle speed, that is, 700-1100 r/min.

How to view the starting of the car tachometer: 1500-2000r/min start, the starting speed of the cold start should not be too high, because the lubricating oil of the cold start engine cannot reach the upper part of the engine, and too high speed will bring heavy wear; if it is a hot start, you can use a slightly higher speed Speed, this is a powerful start.

Generally, the tachometer is on the left and the speedometer is on the right. General notation: the tachometer is marked 0-6000 rpm, and the speedometer is marked 0-220 km/h. The odometer (kmometer) is at the bottom of the tachometer, and the number is used to represent the mileage that has been traveled.