What are the types of crankshaft position sensors?

[PrestonDella]

Crankshaft sensors mainly come in three types: magnetoelectric induction type, Hall effect type, and photoelectric type. The function of the crankshaft position sensor is to determine the position of the crankshaft, specifically the rotation angle of the crankshaft. It typically works in conjunction with the camshaft position sensor to determine the basic ignition timing. Below are the types of crankshaft position sensors: 1. Magnetoelectric Induction Type: The magnetoelectric induction speed sensor and crankshaft position sensor are installed in two layers within the distributor. The sensor consists of a permanent magnet induction detection coil and a rotor (timing rotor and speed rotor), with the rotor rotating along with the distributor shaft. The timing rotor comes in various forms with one, two, or four teeth, while the speed rotor has 24 teeth. The permanent magnet induction detection coil is fixed on the distributor body. By knowing the signals from the speed sensor and crankshaft position sensor, along with the firing order of the cylinders, the crankshaft position of each cylinder can be determined. The rotor signal disk of the magnetoelectric induction speed sensor and crankshaft position sensor can also be installed on the crankshaft or camshaft. 2. Hall Effect Type: The Hall effect speed sensor and crankshaft position sensor is a signal generator that utilizes the Hall effect. The Hall signal generator is installed inside the distributor, coaxial with the distributor rotor, and consists of an encapsulated Hall chip and permanent magnet fixed as a whole on the distributor plate. The number of notches on the trigger impeller matches the number of engine cylinders. When the blades on the trigger impeller enter between the permanent magnet and the Hall element, the magnetic field of the Hall trigger is bypassed by the blades, resulting in no Hall voltage and no output signal from the sensor. When the notched part of the trigger impeller enters between the permanent magnet and the Hall element, the magnetic flux enters the Hall element, increasing the Hall voltage, and the sensor outputs a voltage signal. 3. Photoelectric Type: The photoelectric crankshaft position sensor is generally installed inside the distributor and consists of a signal generator and a signal disk with light holes. The signal disk rotates with the distributor shaft, with 360 light-etched slits on the outer ring to generate a signal for a 1° crankshaft rotation angle. Slightly inward, there are six light holes spaced 60° apart to generate a signal for a 120° crankshaft rotation angle, with one of the light holes being wider to generate a signal relative to the top dead center of the first cylinder. The signal generator is mounted on the distributor housing and consists of two light-emitting diodes, two photodiodes, and circuitry. The light-emitting diodes are directly opposite the photodiodes.