EPS System Description - Torque Sensor CR-V
EPS System Description - Torque Sensor
The torque sensor uses the Hall IC method to detect steering torque and road surface reaction torque- The torque sensor is comprised of a middle shaft, input shaft, lower shaft, torsion bar, magnetic yoke, multi-pole magnet, and other parts- Input from the steering wheel is transmitted to the middle shaft. The middle shaft and lower shaft are connected by the torsion bar, and when the road surface resistance is large and the lower shaft turns with difficulty, the middle shaft and lower shaft rotate differently, causing the torsion bar to twist- But since a multi-pole magnet is connected to the middle shaft and a magnetic yoke to the lower shaft, the torque variation is detected from the amount of twisting of the torsion bar, by the multi-pole magnet, magnetic yoke, and a position control sensor-
As the torsion bar is twisted according to input from the steering wheel, a difference arises in the rotation of the middle shaft and lower shaft. A difference in rotation also arises between the multi-pole magnet and magnetic yoke teeth, and a variation is created in the N/S surface ratio of the multi-pole magnet opposite the magnetic yoke teeth. This N/S surface ratio variation magnetizes the outer edge of the magnetic yoke, and the magnetic flux of the magnetic yoke is transferred to a magnetism collecting ring. The transferred magnetic flux enters the magnetic sensor, and the difference in rotation between the multi-pole magnet and magnetic yoke teeth is output as torque variation. In addition, the temperature differential and other data in the magnetic sensor are used to correct the variation arising in the magnetic flux-
To secure reliability in the torque sensor output signal, there is a main and sub double circuit that outputs two torque signals. When no turning torque is applied to the steering wheel (neutral position), the main and sub output values are 2.5 V each. The main output value rises above 2.5 V when the steering wheel is turned to the right and drops below 2.5 V when it is turned to the left. The sub output value drops below 2.5 V when the steering wheel is turned to the right and rises above 2.5 V when it is turned to the left-
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