4. Frequency, speed and acyclism measurement

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

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

Another method is to use an electronic device specially dedicated to pulse-based analysis of the angular behavior of rotating parts, such as D2T's FFRQ range of devices. These devices do not require mechanical installation...