Tachometer is called a device intended to measure the crankshaft speed, which helps the motorist to control the vehicle and choose the best points to switch the transmission. Today, almost all cars are equipped with a car tachometer, and its popularity is caused by it not at all by its improvement of comfort, but as a result of the introduction of the latest ecology standards required to reduce the consumption of combustible and reduce harmful emissions into the atmosphere.

In addition, the tachometer is capable of tracking that the number of engine speeds did not become critical that soon it can lead to a motor outlet with its subsequent expensive repair. Although drivers are accustomed to the tachometer, most of them have only a superficial representation of such a mechanism. I propose to figure it out in more detail.

Tachometer device

Regardless of the scheme used in the vehicle, the tachometer operates the same - it is based on a sensor, measuring the rotation of the crankshaft rotation and generating the optimal frequency of pulses in one second.

In the rest, the system of this device depends on a certain model of the car and technical points that were used in the development of engineers.

To be more accurate, then the differences can be seen in the sensor design.

The most popular is the tachometers, as the basis of which the magnetic devices are taken, which fix the passage of the specific point of the crankshaft near the control device.

Also, it is possible to use a optocouple - an electronic sensor, which generates a beam of light and analyzes its reflection from the closest item.

In addition, universal tachometers have a scale on which the data obtained by the sensor is displayed.

Usually, on modern machines, tachometers are included in the standard design of the car and called them regular.

A switch, as a rule, similar to the size of the speedometer and other signs, and the electronic tachometer is either mounted in other devices, or is located in a small window.

Such a regular device is very convenient to use, as the motorist does not need to violate the usual procedure or for a long time to be distracted from the road.

In the absence of a standard device, its malfunction or not compliance with the driver's requests, a remote tachometer can be built into the car.

They are installed on special locks - brackets, legs or velcro.

You can purchase such a device, as a rule, in stores that specialize in tuning accessories.

They can be used both by ordinary motorists and riders who are involved in various competitions.

It helps them all the time to keep in view of the current state of the engine, which will allow you to switch the transmissions in a timely manner and not lose the vehicle dynamics.

The main causes of breakage and how to eliminate them

The method of repairing the tachometer directly depends on the cause of its failure. Changing the problem in the following ways:

1. If you have an electronic tachometer installed, the device may not work because of the breakdown of the LED screen. Often this happens as a result of long-term operation of the device and it is impossible to restore it. The only way out of such a situation is to replace the display.

2. If the contacts have worsened or wiring faulty, the source of pulses from the motor to the device is lost. To independently determine such a malfunction, inspect the electrical wires. With minor cracks, the wiring can be searched, however, in case of serious breaks, it is not necessary to do without replacing the wires.

3. If the motor torque sensor is faulty, the tachometer arrow will jump from one side to another. Usually after replacing this part, the tachometer will again work normally.

The reasons that we have listed above are the most relevant and common, they can be quite easy and quickly eliminated by their own. However, if you inspected, but the causes of the inoperability of the tachometer were not discovered, it is necessary to ask for help in a specialized service where the source of the problem will determine and fix it as soon as possible.

Choosing a new tachometer, how to check it for performance

The most popular and relevant type of car tachometer is an arrow or mechanical tachometer.

It is distinguished by using an induction magnetic coil responsible for moving a pointer by dial and turning it.

Such tachometers are considered rather complex and requiring too accurate tuning during installation and repair.

Although this device is considered mechanical, electricity to work is still needed. You can easily check it out.

For this, it is necessary to simply turn off the ignition while driving the vehicle and twist the key to the absolute opening of the side chain, while the speedometer will remain in working condition, and the tachometer will be disabled.

Digital tachometers apply a diode or liquid crystal display, which displays the measured indicator.

It looks like it looks like a scale, an ordinary digital panel, is very similar to the calculator display or the arrow mechanism with a graphic of modernity.

Digital devices are often used by optocoupled, less often - magnetic sensor.

This is due to the fact that such a device is much better coordinated with an analog-to-digital translator.

Deviations in electronic mechanisms are slightly smaller than the analog, for example, 5000 rpm error is 2-4%.

Assistant tools

It is very simple to replace the tachometer on your own, for this, it is enough to arm a normal screwdriver.

Replacement of tachometer with their own hands

Before connecting the tachometer to the car's motor, you should learn from professionals, whether this device will suit the model of your vehicle.

It is necessary to install it directly on the dashboard or near it.

The black minus wire is connected to the body, and the plus red - to the terminal in the ignition lock, which has a voltage of 12 volts.

The instrument entry wire must be connected to the terminal of the traver of the traver either switch, everything depends on the type of the incendiary system.

In the case of the presented backlight, its wire must be connected to the switches of the dimensions.

If a diesel engine is installed in your vehicle, you connect the entrance wire to the W terminal.

Sometimes it may be absent in the generator. In such a situation, it is necessary to withdraw it with an isolated wire.

For this, you should remove the unit and disassemble it.

As soon as you do, you will see three wires that go from the winding to the rectifier of the generator. Wire with insulation can be connected to one of them.

Then, you need to collect the generator back.

If you ask drivers, you need a tachometer in the car, you can hear very different answers.

But, nevertheless, you can come to one denominator - the tachometer is a fairly important device in a vehicle, which is able to increase comfort while driving, although, in a variety of cases, you can do without it.

A tachometer will be very useful for beginners who still do not know how to switch the steps "on rumor", as well as for motorists who care about optimizing fuel consumption and try to improve the dynamics of the vehicle.

That is why the regular tachometer is not included in the design of your car, it is desirable to buy it.

As mentioned above, the installation of the tachometer is not a complex process and for its execution do not need any special skills or equipment.

Each driver can replace the tachometer on its own, in my garage.

However, if for some reason you can't do it on your own, you can always contact the relevant specialists.