Abstract
In the large-scale transportation, the leveling of the transport vehicle loading platform will determine the safety of the transportation. Therefore, the research on the leveling of the transport vehicle loading platform with hydraulic suspension is carried out. The hydraulic suspension systems are simplified as four-point support. Based on the multisensor data collected by the pressure sensors of the suspension hydraulic cylinders and the double axis inclination sensor of the load-bearing platform, the leveling control system of the four-point load-bearing platform is designed according to the principle of the highest point chasing. In order to verify the precision of the leveling method, the leveling of the control system is simulated by using the software AMESim and MATLAB, and the PID controller is added. The results show that the leveling precision and velocity of this method fully meet the leveling requirements of the transport vehicle. On the basis, the leveling control system for the 100 ton transport vehicle is designed. The double axis inclination sensor is used to monitor the tilt angle of the loading platform in real time. The controller can make the suspension hydraulic cylinders act accordingly according to the four height differences to keep the loading platform level. Finally, the leveling experiment of the transport vehicle is carried out, and the lifting experiment is carried out under the condition of no load to full load. It is concluded that the displacement of the four points of the load-bearing platform of the transport vehicle is basically the same. The leveling control system can control the inclination angle of the platform within 0.25 degrees, and the leveling time is less than 1 second. The leveling process has higher precision and shorter time than other methods, which can provide reference for the leveling design of similar platforms.
Highlights
With the development of science and technology, the leveling technology of the vehicle platform has been widely used
By using the double axis inclination sensor to monitor the levelness of the load-bearing platform, the four points of the load-bearing platform of the transport vehicle can be kept in a horizontal plane through the designed leveling control system [19]
The hydraulic cylinders in the suspension system of the transport vehicle are equipped with pressure sensors, which can monitor the pressure of each suspension hydraulic cylinder during the transportation, and the leveling can be achieved automatically according to the signals and the controller
Summary
With the development of science and technology, the leveling technology of the vehicle platform has been widely used. Zhao studied the electrohydraulic synchronization driving control for self-propelled transporter suspension lifting [15]. They are limited to the platform on the horizontal plane, Li studied the autoadaptive multicylinder leveling system with electrohydraulic proportional control [16]. Yang designed the automatic leveling control system of the vehicle-mounted radar platform based on PLC. By using the double axis inclination sensor to monitor the levelness of the load-bearing platform, the four points of the load-bearing platform of the transport vehicle can be kept in a horizontal plane through the designed leveling control system [19]. In the process of leveling, each suspension hydraulic cylinder acts at the same time, which can improve the safety of leveling. The design process and the future research direction of leveling control are summarized in the Section 5
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