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Home > Mall Dynamic > Camshaft Position Sensor Function And Principle Diagram
Camshaft position sensor is a device used to collect the position signal of the valve camshaft. Its working principle is to connect a straight shaft with the detected device through mechanical transmission, so that the position of the camshaft moves on the circumference, and the mechanical contact is placed on the top of the required position, so as to control the device. Camshaft position sensor, also known as synchronous signal sensor, is one of the main control signals of ignition control.
Camshaft Position Sensor (CPS), its function is to collect camshaft dynamic Angle signal, and input the electronic control unit (ECU), in order to determine the ignition time and fuel injection time. Camshaft Position Sensor (CPS) is also known as Cylinder Identification Sensor (CIS), in order to distinguish from crankshaft position sensor (CPS), Camshaft position sensors are generally represented by CIS. The function of the camshaft position sensor is to collect the position signal of the valve camshaft and input it to the ECU, so that the ECU can identify the top center of cylinder 1 compression, so as to carry out sequential fuel injection control, ignition time control and deflagging control. In addition, the camshaft position signal is used to identify the first ignition moment when the engine starts. Because the camshaft position sensor can identify which cylinder piston is about to reach TDC, it is called the cylinder identification sensor.
The photoelectric crankshaft and camshaft position sensor produced by Nissan Company is improved by the distributor, which is mainly composed of signal disk (that is, signal rotor), signal generator, distributor, sensor housing and wiring harness plug.
The signal disk is the signal rotor of the sensor and is mounted on the sensor shaft, as shown in Figure 2-22. At the edge of the signal plate, two rings of light transmission holes with uniform spacing radians are made.
Among them, the outer ring is made of 360 light transmission holes (gaps), and the interval arc is 1. (The light penetration hole is 0.5. The blackout hole accounts for 0.5.) , used to generate crankshaft Angle and speed signals;
The inner ring is made of 6 light-transmitting holes (rectangular L) with an interval of 60 radians. Is used to generate the TDC signal of each cylinder, in which a rectangular wide edge is slightly longer, used to generate the TDC signal of cylinder 1.
The signal generator is fixed on the sensor housing, which is composed of Ne signal (speed and Angle signal) generator, G signal (top dead center signal) generator and signal processing circuit.
Both the Ne signal and the G signal generator are composed of a light-emitting diode (LED) and a phototransistor (or photodiode), with two leds facing the two phototransistors respectively.
Figure 2-22 shows the working principle of the photoelectric sensor. The signal disk is mounted between the light-emitting diode (LED) and the photosensitive transistor (or photodiode). When the light transmission hole on the signal disk is rotated between the LED and the photosensitive transistor,
the light emitted by the LED will be illuminated to the photosensitive transistor, at this time the photosensitive transistor is on, and its collector output is low (0.1 ~ O.3V);
When the blackout part on the signal disk rotates between the LED and the photosensitive transistor, the light emitted by the LED cannot be illuminated to the photosensitive transistor, and the photosensitive transistor is cut off and its collector output is high (4.8 ~ 5.2V).
If the signal disk is continuously rotated, the light transmission hole and the light blocking part will alternately turn the LED to light or light blocking, and the photosensitive transistor collector will alternately output high and low levels.
When the sensor shaft rotates with the crankshaft and the valve camshaft, the light transmission hole and the light blocking part on the signal disk are turned between the LED and the photosensitive transistor,
and the light emitted by the signal disk will be alternately irradiated to the photosensitive transistor of the signal generator, and the signal sensor will produce a pulse signal corresponding to the crankshaft position and the camshaft position.
Since the crankshaft rotates twice and the sensor shaft drives the signal to circle once, the G signal sensor will generate six pulse signals. The Ne signal sensor will generate 360 pulse signals. Because the gap between G signal transmission holes is 60 radians.
The crankshaft rotates 120 per rotation. It produces a pulse signal, so the G signal is usually called 120. The signal. Design and installation guarantee 120.
Signal is 70 before TDC. (BTDC70.) The signal generated by the transparent hole with a slightly longer rectangular wide edge corresponds to 70 before the top dead center of the engine cylinder 1. So that the ECU can control the injection advance Angle and ignition advance Angle.
Because the Ne signal transmission hole interval radian is 1. (The light penetration hole is 0.5. The blackout hole accounts for 0.5.)
Therefore, in each pulse cycle, the high and low levels account for 1. Crankshaft Angle, 360 signals indicate the crankshaft rotation 720. The crankshaft rotates 120 per rotation. The G signal sensor generates one signal, and the Ne signal sensor generates 60 signals.
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