ระบบควบคุมไฮดรอลิกใบมีดดันดินให้อยู่ในแนวระดับโดยอัตโนมัติ

Abstract

This research aimed to present a design of a hydraulic control system and mechanical system for automatically leveling the bulldozer blade when the bulldozer was operated on uneven ground and slopes. This would enable the bulldozer to perform more efficiently. Based on the data receiving from the angular velocity sensors installed in the bulldozer, the designed PID control system in the microcontroller directed hydraulic servo valve systems to continuously align the bulldozer blade. In the experiment, the bulldozer was set on slopes less than 20 degrees. The study revealed that the designed PID control system could automatically align the bulldozer blade. Moreover, it could reduce the overshoot, the oscillations, and the setting time as expected. The optimal tuning parameters of the PID controller for a stable system and the required results were the closed-loop control function in an automatic control mode (Kp = 12 Ki = 2 and Kd = 2) when the angle of the bulldozer blade was ± 2 degrees with the mean percentage error of less than ten percent.