To optimize engine operating modes, accurate measurements are needed, which can be done using modern devices - electronic tachometers. Such a mechanism with high accuracy will show the angular velocity of the motor shaft, which is expressed in rpm. With the help of special devices, you can also determine the linear speed of the rotating mechanism, it is expressed in m / s. The electronic tachometer is successfully used in production during commissioning. It helps to correctly calibrate the engine and optimally tune the control system. Instrumentation and control departments actively use this device in their daily work.
In addition, the electronic tachometer is successfully used in the automotive industry. It helps motorists to monitor the engine speed and choose the most optimal mode of its operation. For example, during a change of season or during a cold / hot period, this device becomes an indispensable assistant, because it extends the life of the car.
This device has long been used in the most critical industries where it is necessary to carry outconstant control over the rotational speed of the shaft of the electric motor, internal combustion engine, turbine, etc. In aircraft construction, an electronic tachometer is one of the main instruments that control the operation of a turbo engine. The life of the entire crew and passengers directly depends on his testimony. Failure of the tachometer can lead to disaster.
Let's look at the operation of this device using the example of a small circuit that is easy to find on the net. Any electronic tachometer must receive information from a sensor that measures the number of engine revolutions or its linear speed. This is achieved by direct contact of the moving part of the device with the motor shaft or remotely using induction or laser sensors.
In our case, 70-90 turns of PEV-1 wire, wound on the main ignition wire of the car, play the role of an induction sensor, which uses our self-made electronic tachometer for its work. The wire connection scheme is simple - one end of the coil goes to ground, and the other to the control circuit. The rest of the circuit consists of a flip-flop that extracts a useful signal and passes it to the counter-based counter. Quantity calculated per unit of time
pulses are given to the matching circuit, which makes this information clear to the digital indicator. The operating cycle of the device is set using a multivibrator or a pulse generator based on a quartz element.
Such an electronic tachometer canhave a wide variety of options. Other solutions are used for its implementation. The computational part can be constructed on the basis of a microprocessor. This is good practice in writing programs to make it work. In this case, it is best to use microprocessors with the ability to reprogram. When designing, do not forget about the noise immunity of the device.
