Everyone who has a car knows that it mounted tachometer. However, not everyone understands the principle of the motor tachometer. Often you can hear from them questions on the similarity of "What does this arrow?". Therefore, in this article we will explain the basic principles of automotive tachometer. Tachometer in the car - a device that is used to determine the number of engine revolutions. Number of revolutions per unit time changes or relative speed. The main function performed by the tachometer, is that it helps you choose the right gear, but it can prolong engine life. In other words, when the tachometer needle reaches the red zone, you should immediately switch to a higher gear. Also, the tachometer is used for adjustment, for both idle and to control the motor in motion. Tachometer works by recording the number of pulses that are received from sensors, analyzing the pause between them, as well as the order they are received. Counting these pulses can be carried out in various ways: in the opposite direction, forward, and also in both. Indicators that were measured, as a rule, are converted to a certain value. They can be minutes, hours, seconds, etc. Tachometer is designed so that the collected values ??can be periodically reset. And the accuracy of the fairly conventional, the error is approximately equal to 400 rpm., Most accurate car tachometers can display data from up to ~ 100 rpm. Tachometers for motor vehicles are of two types: analog and digital. In the scheme of the digital tachometer may include the following elements: circuit reset the processor, LCD panel, the ADC 8 bits. Optocoupler intended to diagnose valve idle; CPU, sensor fluid; These tachometers are made in the form of an electronic scoreboard, on which is necessary for the driver information. Namely, the estimates produced by the engine speed and shaft. Very useful digital tachometer for tuning with electronic ignition automotive engine blocks, and then when you need to accurately set the thresholds of the economizer (a device that serves as a dresser full of fuel when accelerating or when the limit of the engine). Another type of tachometer is - analog, for many motorists it is more convenient. This tachometer indicates engine speed through the coordinated work of the following instruments: magnetic coil circuits, a graded scale of the arrows; wires, Permanent Mission that reads from the crankshaft. Operates a tachometer on the principle of electronic: the signal that emanates from the shaft, is transmitted by wire on the chip defining the movement of the instrument arrows on the scale of the marks. It makes sense to put the car digital speedometer, because it regulates the idle speed, check operation of the control unit "economizer forced idle (idle economizer) and quality of staffing tachometer (digital equipment makes data more accurately). When the car is moving, it's best to use a tachometer, which is installed you from the factory. The brain and the human eye perceives the faster and better data, which outputs analog (in the form of turning arrows), as opposed to digital values. Besides the high accuracy of the motion does not really need. By the method of installation is also possible to allocate some tachometers. If you do not take into consideration the type of tachometer (analog or digital), then there are several classifications of the installation of these devices. So, is remote and standard automotive tachometer. Staff tachometer mounted directly in the dashboard of the car. It is used in most machines, as more familiar. Remote also includes a tachometer that it will be installed on a torpedo panel. Often superscript tachometers need to give the car a more stylized look. It so happens that his pose, because this type of tachometer some drivers feel more comfortable. Includes remote tachometer have to be foot, on which it is set on the torpedo panel. Each tachometer should go to installation instructions and the circuit it is connected. However, the principle that connects all tachometers same - the red wire to the plus, green for reading the engine speed, and the black to ground. If you have a carbureted car, then connect the tachometer to be the ignition coil, to the wire that goes from the timer and attached to the coil. If in a vehicle equipped with an electronic control system, a new tachometer to be connected to a wire that goes from the staffing tachometer. On diesel engines, the tachometer should be directly connected to the generator. Repair tachometer. Very often repair the tachometer has to produce, when his hand starts jumping wildly on the dial or shows incorrect results. Typically, in such cases, a thorough repair chips tachometer, and if necessary to resolder it. However, this would be to determine the exact cause of the problem. If you do not have the necessary skills, you should not do it yourself, it is best to contact a qualified service center. Repair of the tachometer you fulfill it as much as possible quality and professionalism. How much is a speedometer? Prices vary tachometers in wide enough range. It all depends on the version and its modifications. Another important factor is and the brand manufacturer. For example, the easiest car tachometer devoid of any extra features will cost around 750-1450 rubles, depending on the supplier and manufacturer. It should be noted also that the remote tachometer will cost a bit more expensive than the built-in. The most expensive tachometers may have a price in excess of 15,000 rubles. Typically, such roads are modified electronic multi-function devices, and offer many additional features.
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