How does an automotive phase modulator work
The working principle of the automotive phase modulator is realized by detecting the position and rotation Angle of the camshaft. There is a detection coil inside the phase sensor, and when no metal object is near, the LC circuit is in a resonant state. When a metal object is near, the detection coil will induce eddy currents on the surface of the metal object, resulting in the imbalance of the LC parallel circuit, thus detecting the phase change .
Phase sensor according to its structure and waveform can be divided into photoelectric type and magnetic induction type. The photoelectric phase sensor is composed of a signal generator and a signal disk with an optical hole. When the signal disk rotates, the optical hole will block or allow light to pass through to generate a signal. Magnetic induction phase sensor uses the principle of magnetic induction to work, when the signal rotor rotates, the air gap in the magnetic circuit will change periodically, resulting in magnetic flux changes through the signal coil, resulting in induced electromotive force .
Phase modulators take advantage of the linear electro-optical effect in optics, by applying an electric field to the optical medium, the material produces linear birefringence, resulting in phase shift. The key indicator of phase modulation efficiency is the half-wave voltage, the lower the half-wave voltage, the higher the efficiency .
The function of the automobile phase modulator is to directly change the parameters of the resonant circuit by using the modulated signal, so that the carrier signal will generate phase shift when passing through the resonant circuit and form a phase-modulated wave. The application of phase modulator in automobile is mainly reflected in the dynamic regulation of engine intake phase and exhaust phase to improve engine performance and efficiency .
The working principle of the phase modulator is based on the linear electro-optical effect, which adjusts the phase of the light wave by changing the electric field strength. In the automotive sector, phase modulators are used to control the intake phase regulator and exhaust phase regulator, thereby optimizing the combustion process and exhaust efficiency of the engine .
Specific application scenarios include: under low speed or low load conditions, the intake phase regulator can advance the closing time of the intake valve appropriately, enhance the swirl and roll effect in the cylinder, and improve the combustion stability; At high speed or high load, it will delay the closing time of the intake valve, increase the intake stroke length, and improve the engine power output . In addition, phase modulators are also used in driverless cars, on-chip biosensors and other fields to achieve more complex optical control and signal processing functions .
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