Research on the Mechanical Zero Position Capture and Transfer of Steering Gear Based on Machine Vision

The steering gear is a very critical component in the control system of the aircraft with steering gear. In order to achieve a high-precision rudder deviation command, it is necessary to detect the mechanical zero position of the steering gear. Based on machine vision, a non-contact method for capturing the mechanical zero position of the gas steering gear was proposed, which aimed to transmit the position of the mechanical zero position to the encoder, and saved it to the system. The method includes three parts: identification, capture and transmission of the center of the mechanical zero position. The edge detection method was used to identify the center of the mechanical zero position which was captured by overlapping the center of the mechanical zero position with the pixel reference point in the pixel coordinate system. To complete the transmission of the reference, according to the relative position of the pixel reference point and the mechanical zero position to be tested, the angle inverse method was used to calculate the encoder value corresponding to the mechanical zero position. This study provides a reliable basis for the calculation of rudder deflection angle and electrical compensation value.