Ref desc Crankshaft Position Sensor2

CPS sensor detects the exact position and rotational speed  RPM  of a crankshaft.

It’s a key input for the engine control unit  ECU  to Determine ignition timing  when to fire spark plugs Control fuel injection timing

Monitor engine speed for safety systems A toothed wheel  reluctor ring  is attached to the crankshaft. The CPS sensor uses magnetic  inductive  or Hall-effect technology to detect passing teeth. Each tooth’s passing generates an electrical pulse. The ECU counts pulses → calculates crank angle & RPM.  Inductive type – generates voltage when a metal tooth passes Hall-effect type – uses a magnet + semiconductor switch for more precise digital output Optical type – uses light interruptions  rare in CPS Cars, trucks, generators, marine engines Industrial machinery with large combustion engines CPS sensors integrate with MEMS sensors in modern industrial control systems, both show up in smart HVAC and generator sets.