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The crankshaft position sensor is one of the most important sensors in the engine electronic control system. It provides the ignition timing (ignition advance angle) and the signal to confirm the position of the crankshaft. It is used to detect the piston top dead center, crankshaft angle, and engine speed. The structure adopted by the crankshaft position sensor varies with different models, and can be divided into three categories: magnetic pulse type, photoelectric type and Hall type. It is usually installed on the front end of the crankshaft, the front end of the camshaft, the flywheel or the distributor.
The crankshaft position sensor is usually installed at the front end of the crankshaft (at the pulley). The rear end of the crankshaft is close to the large flywheel or the middle of the crankshaft. Early models were also installed in the distributor, which is one of the most important sensors in the control system. Its functions include: detecting the engine speed, so it is also called the speed sensor; detecting the position of the top dead center of the piston, so it is also called the top dead center sensor, including detecting the top dead center signal of each cylinder used to control ignition, and used to control the sequential injection The top dead center signal of the first cylinder of oil.
There are three main types of crankshaft sensors: magnetoelectric induction, Hall effect, and photoelectric.
Magnetoelectric induction type:
The magnetoelectric induction speed sensor and crankshaft position sensor are installed in the distributor separately on the upper and lower layers. The sensor consists of a permanent magnet induction detection coil and a rotor (timing rotor and speed rotor), which rotates with the distributor shaft. The timing rotor has one, two or four teeth and other forms, and the speed rotor has 24 teeth. The permanent magnet induction detection coil is fixed on the distributor body. If the speed sensor signal and the crankshaft position sensor signal are known, and the working sequence of each cylinder, the crankshaft position of each cylinder can be known. The rotor signal disk of magnetoelectric induction speed sensor and crankshaft position sensor can also be installed on crankshaft or camshaft.