Crankshaft position sensors are usually installed at the front and rear ends of the crankshaft near the flywheel or in the middle of the crankshaft. Early models are also installed in the distributor, which is one of the most important sensors in the control system.
Its function is to detect the engine speed, so it is also called speed sensor; It detects the top dead center position of the piston, so it is also called top dead center sensor, which includes detecting the top dead center signal of each cylinder for controlling ignition and detecting the top dead center signal of the first cylinder for controlling sequential fuel injection.
Extended data
Hall effect speed sensor and crankshaft position sensor are signal generators using Hall effect. The Hall signal generator is installed in the distributor, and the packaged Hall chip and permanent magnet are integrally fixed on the distributor. The number of notches on the trigger impeller is the same as the number of engine cylinders.
When the blade on the trigger impeller enters between the permanent magnet and the Hall element, the magnetic field of the Hall trigger is bypassed by the blade, so that Hall voltage is not generated and the sensor has no output signal. When the notch on the trigger impeller enters between the permanent magnet and the Hall element, the magnetic field lines enter the Hall element, and the Hall voltage rises.
The timing rotor has one, two or four teeth, while the speed rotor has 24 teeth. The permanent magnet induction detection coil is fixed on the distributor body.
If we know the speed sensor signal, the crankshaft position sensor signal and the working sequence of each cylinder, we can know the crankshaft position of each cylinder. The rotor signal disk of the magnetoelectric induction speed sensor and the crankshaft position sensor can also be installed on the crankshaft or camshaft.
Baidu Encyclopedia-Crankshaft Position Sensor