Zero correction method and device of torque sensor

Abstract

The invention discloses a zero correction method and a device of a torque sensor. The method comprises static zero learning and dynamic zero correction, and mutually checks and conforms according to a certain time sequence and an algorithm, so as to filter off disturbance and guarantee the control accuracy, and can dynamically track zero deviation in real time during the using process of a user. The method limits the control algorithm within a limiting range of the torque sensor, seriously guarantees the safety of zero correction, ensures that a steering system is always symmetrical and balanced during the driving process of the user, and even if zero correction range is exceeded to a certain degree, a controller can immediately cut off power assisting output and light up a fault light, provides driving comfort and safety for the user to the maximum degrees, ensures that the electric power assisting steering system is optimally matched, and prolongs the service life of products.

Description

technical field [0001] The invention relates to a correction method and device for a torque sensor, in particular to a zero point correction method and device for a torque sensor in an electric power steering system of an automobile. Background technique [0002] In the prior art, the steering wheel of an automobile is equipped with an electric power steering system. When the steering wheel is turned and the torque is transmitted to the torsion bar, there is a deviation in the direction of rotation between the input shaft and the output shaft. Signal to determine the size and direction of the power steering, and use the drive motor to assist the steering operation. [0003] The long-term use of the electric power steering system will lead to the deviation of the installation position of the torque sensor, the aging of the spring elastic recovery force of the torque sensor potentiometer, the mechanical wear of the torque sensor potentiometer slider and the tube screw ball gro...

AI Technical Summary

Problems solved by technology

[0003] The long-term use of the electric power steering system will lead to the deviation of the installation position of the torque sensor, the aging of the spring elastic recovery force of the torque sensor potentiometer, the mechanical wear of the torque sensor potentiometer slider and the tube screw ball groove, etc., resulting in the loss of the electric power steering torque. Deviation between mechanical zero point and electrical zero point

When the driver manipulates the steering wheel, the left and right steering moments are asymmetrical, and the vehicle loses the ability to drive straight. In severe cases, it will lead to active steering or direction killing.

The existing technology can only perform zero point calibration when the user maintains, and this function is completely missing when the user uses it normally

Images