Measuring principle of engine tachometer;

Because the common rail and distributed fuel supply of diesel engines are increasing, it is difficult to use the method of measuring the speed of rotation using the contraction of the fuel injection tube (such as the combination method of the diesel engine speed sensor CP-044 + diesel engine speedometer GE-1200), Therefore, the method of measuring the rotational speed using the vibration of the entire engine is described below. Of course, this method is also applicable to the reciprocating engine that vibrates the entire engine as the piston works.

Install the acceleration sensor on the engine casing, detect the vibration of the engine, input this vibration signal to the FT-1500 advanced tachometer, perform FFT processing, and separate the periodic complex signal from the basic (first order) frequency and integral The high-order frequency of multiples, and then calculate the engine speed.

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