Winding the speedometer with your own hands: circuit. How to make an electronic speedometer rewind?

The mileage is the main indicatortechnical condition. It can be used to judge whether the machine needs urgent maintenance or not. He plays an important role in the field of automobile sales in the secondary market. Everyone who is interested in buying a used car, first of all is interested in the seller, what distance he has overcome. Well, if you get a responsible seller who does not use a speedometer winding. But this happens not so often.

The passed way, a length of several hundred orthousands of kilometers, much can tell about the car. Are its components intact, is there a need to replace consumables, or is it still possible to delay? The smaller the mileage, the higher you can ask for the cost. Some owners do not go to any tricks to sell the car as profitable as possible. What is this clever invention and is it easy to make it yourself?

Forced causes

Number of those wishing to contribute a smallcorrection in the mileage readings a lot. This suggests that the phenomenon is quite widespread. At the same time, every owner can find a worthy explanation for his action. Basically, everything is written off to a faulty speedometer or the need to replace the instrument panel.

But if to the end to be frank, the mainthe reason for speedometer reeling is the desire, at least to some extent, to rejuvenate your car. And, as a rule, making the necessary adjustments is made for the purpose of further sale. The so-called pre-sale preparation. It is much easier and more pleasant to sell or buy a car with a small mileage.

Both sides win: and the seller who filled the price, and the buyer, who seems to have received a relatively new car. Therefore, the topic of running a race is the most discussed among a large number of former and future vehicle owners.

In addition to those wishing to reduce the mileage, there are those,who try to increase it on the contrary. Basically it's the drivers of commercial vehicles or vehicles used for service. There is also an excuse for this, and on the one hand it is well-grounded.

Those norms of fuel consumption, which are accountingpractically any enterprise takes into account, can not cover real costs for gasoline or diesel fuel. A winding speedometer allows you to some extent to solve the problem, since the amount of compensation that is used when using a personal vehicle, basically able to cover only the cost of fuel. That's just the depreciation and wear of the car is not taken into account. In this connection, many drivers go to such a forced measure.

Speedometer and odometer

Everyone knows perfectly what constitutesspeedometer. This is a device that shows the speed of the car at any particular time. But there is also such a thing as an odometer. Someone has already heard this term and knows what it's about, but not everyone is able to understand what kind of device it is. Meanwhile, it serves to measure the distance traveled by the car.

In fact, the speedometer is a combineda device that combines a speed meter and a mileage meter from the date of issue. In some cars, in addition to the odometer, there is one more device - a mileage counter for the day. To reset it, a special button is provided (something like speedometer winding).

Because the odometer is mounted directly in thespeedometer, many drivers often call this two devices a general word - the speedometer. Which is not entirely true, because the function of the speedometer is to measure the speed of the car, and the odometer measures the distance traveled by it.

Variations and the principle of the action of the speedometers

In cars, you can find different types of meters for distance and speed, but as a rule, there are two main varieties:

• mechanical (analog);
• electronic (digital);
• electromechanical (combined).

Mechanical speedometers are also divided into several types and can be:

• centrifugal;
• chronometric;
• vibrational.

Electromechanical devices are divided intoelectromagnetic and induction. This is important to know, because it depends on the use of this or that scheme of winding the speedometer with your own hands. Indications, regardless of the type of device, are output in km / h, and in the USA - mph (miles per hour). How exactly is the speed measurement?

There are innovative speedometers thatcan determine the speed of the car using a satellite positioning system (GPS, GLONASS). However, in factories such systems are not installed and are rather an additional option, which significantly increases the comfort for drivers.

Mechanical speedometer

The principle of the device in cars with reardrive: the speedometer calculates the speed reading from the output shaft of the gearbox. In this case, the accuracy of the indications is influenced by the tire size, the gear ratio of the rear axle gearbox and the intrinsic error of the device.

To measure the speed of front-wheelThe car speedometer rests on the left wheel drive. Here the readings, in addition to the error of the device and the size of the tires, are affected by the so-called effect of rounding the road. That is, with the entry of the left turn, the speed will be less than the rectilinear motion. If the car turns to the right, the speed will be slightly increased. The scheme of winding the speedometer with your own hands of a mechanical type is not so complicated, as will be clear later.

Electronic speedometer

Practically every modern carequipped with an electronic speedometer. Perhaps, after a certain time, it will completely supplant the mechanical analogs, but for the time being they are still present even in new models. The operating principle of the electronic device is more simple than that of a mechanical speedometer.

Often an electronic device hasa magnet that is attached to the output shaft of the gearbox. The magnet rotates together with the shaft, and the electronic unit is located near it. In this case, rotating around the circumference on the transmission shaft, the magnet periodically passes in close proximity to the electronics, transmitting the signal to it and thereby performing the sensor function.

And every time a magnet sweeps past the block,it sends an impulse to the speedometer. Inside the meter there is a so-called black box (differs by increased intelligence), which calculates the speed of these pulses. To make the winding of the speedometer, this knowledge does not interfere.

There is nothing easier to understand: the faster the pulse transmission frequency, the faster the box shaft rotates. All calculations are carried out with maximum accuracy and have practically zero error.

Errors

It happens that the meters record incorrectcar speed. On the one hand it's even good when the speedometer shows slightly increased readings. In this case, the driver will comply with the speed limit and will not receive a fine. And the producers are calm, and drivers do not violate traffic rules.

Another thing is if the device on the contrary lowersreal speed. Then many companies would simply be ruined by numerous claims from drivers, which indicated that the cause of fines or emergencies were incorrect readings of the speedometer.

Why do errors occur? The fact is that this device does not differ with increased accuracy, because for determining the speed, the rotation of the car wheel is mainly used. This takes into account its diameter, and this parameter does not differ in stability. It is important to know when deciding how to do an electronic speedometer or mechanical winding.

Speedometers on many modern carshave an average error of 10% at a speed of 200 km / h. But the dependence is non-linear. That is, at a speed of 110 km / h the difference with the real can be 5-10 km / h. But if you go slower (up to 60 km / h), then the error is so small that it can not be felt.

Calculation of costs

For many, the price of the question stands outthe fundamental factor in almost everything: purchases, services and so on. In this connection, it is reasonable to ask yourself the question, what will be necessary in some cases to correct the speedometer. Here, as in any work in car repair shops, everything depends on the complexity of its implementation and volume.

With mechanical speedometers, not so muchit's difficult, all you need is to rotate the mechanism drive in a certain direction. There would be time, and there will always be a desire. However, with electronic devices of accounting everything is much more complicated than it may seem. Here you need basic knowledge of the electrical equipment of the car. And in some cases, you can not do without the knowledge and skills of the programmer.

Currently, in many stores, wherethere is a website, you can buy a speedometer winding with adjustable winding speed. On sale there are different options, and any car owner will get what they want.

The first electronic speed metersrecorded the mileage readings to the internal memory, which allowed relatively easy adjustment of the values. In many modern cars, the necessary information is duplicated among the electronic components of different systems (computer, brake, lighting, immobilizer, etc.). These data are well encrypted.

In order to properly conduct the procedure, it is necessaryedit the data wherever they are. This greatly complicates matters, besides, it is necessary not to touch upon the important indicators of other systems. If you turn to a non-professional, you should prepare for buying a new part, perhaps not one. In addition, the work itself will not be expensive.

As for the cost of a competent adjustment,then the prices vary significantly and depend not only on the car brand, but also on the year of production. For example, for the UAZ Patriot car, the price can start from 1500 rubles. Owners of the new Land Rover car will have to shell out for 15,000 rubles. There are companies in which the price for such work can reach 25,000 rubles. Perhaps it is worth buying a speedometer winding scheme with adjustable winding speed and do it yourself.

Mechanical speedometer scrolling

If there is no extra money or desire to entrust yourcar to outsiders, you can do everything yourself. However, with mechanical devices, as it was written above, it is not so difficult to do, it would be time. For this, it is necessary to detach the cable from the box and fix it to the shaft of some motor. The drill is also suitable, which will be even better.

Having chosen the direction, start twisting. Time for this will take a lot, because of the high gear ratio gearbox. You can use another way - to dismantle the odometer, then using a special tool and brute force, set the necessary indications.

Electronic device rewinding

To correct the reading of electronic devicesIt is necessary to use special equipment and computer programs. You need to know exactly where to look for data, which is complexity. But often all information is collected in one place.

The electronic speedometer is rewound by reprogramming the current data of vehicle blocks. You can use one of several methods of connection:

• directly to the data schema;
• through the connector in the dashboard;
• by means of a diagnostic socket.

The winding of the electronic speedometer isA complex procedure, bordering on certain risks. Despite this, it is often used, because you can significantly raise the value of the car, which is only at the mercy of the sellers.

Is it possible to detect the twisting of the speedometer?

It all depends on the type of device. If this is an electromechanical or mechanical device, then just look under the car and inspect the drive box. In the presence of contaminants and unusual traces, it can be concluded that the speedometer readings were corrected. If the drive is clean, then with a high probability everything is normal. The already proven fact - 50% of cars from the total number of vehicles exhibited in the secondary market have incorrect mileage readings.

If the machine has an electronic speedometer, then identifyextraneous intervention is more difficult. But to connect the winding of the speedometer in this case is also not easy (at least some consolation). Without an experienced master and special equipment simply can not do. Often in car repair shops, tags with accurate mileage data are attached to the car. This is done during maintenance or after replacing parts of the fuel system. It is worth comparing the data from the tag and the speedometer reading. If they coincide, then there is nothing to worry about, otherwise there is a possibility of deceit.

</ p>