The function of an automobile eccentric shaft is to adjust the camshaft based on the judgment of the sensor, so that the eccentric shaft can achieve the optimal intake valve lift in each operating state.

The function of an automobile eccentric shaft is to adjust the camshaft based on the judgment of the sensor, so that the eccentric shaft can achieve the optimal intake valve lift in each operating state.

The engine eccentric shaft sensor detects the position of the eccentric shaft when equipped with an electronic valve adjustment system. The eccentric shaft adjusts the camshaft to achieve the optimal intake valve lift in almost every operating state (intake valve lift can be infinitely adjusted). The eccentric shaft is adjusted by an electronic valve adjustment servo motor.

The eccentric axis sensor is equipped with two independent angle sensors with opposite characteristic lines. The eccentric shaft sensor operates based on the principle of magnetoresistive effect. Here, a ferromagnetic conductor changes its resistance under the action of a magnetic field. The sensor adopts a redundant design structure. Two sensor elements are installed in one housing. A sensor undertakes the guidance task, which is monitored by a reference sensor.

If the eccentric shaft is adjusted from zero stroke to the maximum stroke direction, then the guiding sensor will provide an increased angle value, and another reference sensor will provide a reduced angle value. The data is transmitted to the DME through a serial interface. The DME adjustment unit adjusts the position of the eccentric shaft through an electronic valve adjustment servo motor until the current position is consistent with the standard position.

The measurement range of the sensor is 180 °. The sensor is supplied with 5V voltage by the engine control unit DME. The data from the eccentric shaft sensor to the DME is transmitted at a moderate beat frequency of 250kHz.