4. Measurement of frequency, speed, and acyclism

Due to the crank-connecting rod principle, the instantaneous evolution of the displacement, speed, and acceleration of a motor's moving parts is not a simple linear function. As a result, the variation in volume, angular velocity, or instantaneous torque is not regular. Specific analyses by motor manufacturers therefore require knowledge of physical phenomena as a function of angles rather than time.

A classic method involves placing an angle encoder on the rotating parts to be studied (crankshaft, camshafts, etc.), but this can pose installation problems in the case of transverse engines in vehicles or on certain parts of clutches or gearboxes.

Another method involves using an electronic device specifically designed to analyze the angular behavior of rotating parts based on pulses, as is the case with the FFRQ range of devices from D2T....