What is the automobile crankshaft signal wheel
Automobile crankshaft signal wheel , also known as crankshaft position sensor or engine speed sensor, its main function is to monitor the crankshaft speed and Angle of the engine, so as to accurately determine the position of the crankshaft. The collected data is transmitted to the Engine Control Unit (ECU) or other relevant computer systems to ensure accurate control of engine ignition timing .
Working principle
A crankshaft signal wheel is usually designed as a wheel with multiple teeth segments. When the signal wheel passes through the sensor, an AC voltage is generated, and the frequency of this voltage fluctuates with the change of speed. This design allows the sensor to measure the engine's speed by means of a pulse signal.
Type and installation location
Crankshaft signal wheel according to the principle of generating signals can be divided into magnetic induction type, photoelectric type and Hall type three types. Common Hall sensors usually adopt a 3-wire design, including a power cable, AC signal cable and AC signal shielding cable . The installation location is usually in the distributor, on the transmission clutch housing, front or rear end of the crankshaft, etc., depending on the type of sensor and engine design .
Work in concert with other components
The crankshaft signal wheel usually works in conjunction with the camshaft position sensor to determine the basic ignition timing. By providing precise position information, they ensure that the engine can operate in accordance with the predetermined firing sequence, thus achieving smooth and efficient operation .
The main function of the automobile crankshaft signal wheel is to detect the crankshaft speed and Angle of the engine, determine the position of the crankshaft, and transmit the detected results to the engine control unit (ECU) or other relevant computer systems to ensure the accurate control of the engine ignition timing .
Specifically, the crankshaft signal wheel (also known as the crankshaft position sensor or engine speed sensor) has the following functions:
Check engine speed : Determine the working state of the engine by detecting the speed of the crankshaft.
Determine piston TDC position : Identify the TDC position of each cylinder piston. This is critical for controlling ignition and fuel injection timing. For example, it is capable of providing individual cylinder TDC signals for controlling ignition and first cylinder TDC signals for controlling sequential fuel injection .
provides crankshaft Angle signal : By detecting the crankshaft Angle, ensure the engine ignition and fuel injection timing is accurate.
works with camshaft position sensor : Usually works with the camshaft position sensor to ensure that the basic ignition moment of the engine is accurate. The camshaft position sensor determines which cylinder piston is at compression stroke, while the crankshaft position sensor determines which cylinder piston is at TDC .
In addition, the design features of the crankshaft signal wheel include a wheel with multiple teeth segments. When the signal wheel passes through the sensor, an AC voltage is generated whose frequency fluctuates with the speed .
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