挖掘機電液控制系統(tǒng)進出口獨立控制特性分析與實驗研究
[Abstract]:Hydraulic system has been widely used in aerospace, ship, mobile vehicle, iron and steel industry because of its high output power-weight ratio, fast response, high control precision, and can provide remote control, etc. The hydraulic system has been widely used in aerospace, ship, mobile vehicle, iron and steel industry and so on. At the same time, the integration of hydraulic system and electronic control technology has greatly promoted the rapid growth of the application of electro-hydraulic control system. However, hydraulic system is a kind of transmission with high energy consumption in exchange for excellent control performance, and its application is increasingly challenged by other transmission technologies, such as mechanical transmission and electrical transmission. Therefore, energy saving control has become one of the focuses in the hydraulic field on the premise of meeting the performance requirements. The traditional valve-controlled hydraulic system uses a multi-throttling main control valve core to control the inlet and outlet oil circuit of the hydraulic actuator at the same time. In the process of inlet throttling speed regulation, the outlet carries on the throttling at the same time, resulting in the excess outlet throttling loss. The system has high energy consumption and low efficiency. Independent throttle control technology for hydraulic actuator inlet and outlet not only completes throttle speed control, but also takes into account pressure control. Therefore, the repeated throttling loss in traditional valve controlled hydraulic system can be eliminated. In view of the limitation of the traditional valve-controlled hydraulic system in the control of inlet and outlet throttle, this paper puts forward a solution of the independent control system, which takes into account the excellent control characteristics and low energy consumption, and gives the opening characteristics of the inlet and exit valve ports among them. The key problems such as pressure difference compensation characteristics and motion control characteristics are deeply studied. Based on the valve opening path of the traditional four-way valve-controlled hydraulic system, seven typical ways of opening the valve opening path of the independent control system are put forward, and their static characteristics are analyzed. Based on the state space equation, the dynamic characteristic simulation model of the independent control system is established, and the dynamic characteristic analysis is carried out. The optimal valve opening path mode of the independent control system is obtained. Based on the principle of hydraulic pressure difference compensation for load sensitive system, the inlet pressure difference compensation mode and outlet pressure difference compensation mode are obtained according to the independent regulation characteristics of the inlet and exit opening degree of the independent control system. Based on the calculation formula of pump source pressure, the optimal opening path of inlet differential pressure compensation system and outlet differential pressure compensation system is obtained. The static characteristic analysis is carried out, and the optimal compensation method of pressure difference is obtained. Based on the principle of pre-valve compensation and post-valve compensation, the analysis models of the original load sensitive system and the independent control system of the pre-valve compensation inlet and outlet are established, and the analysis of the two systems under the load lifting condition is carried out respectively. The energy saving characteristics of the imported pressure difference compensation import and export independent control system are analyzed. According to the dead-time and hysteresis characteristics of proportional valve, a two-way equivalent compensation method of dead-time hysteresis is proposed. The adaptive inertial filter is used to filter the pressure signal. The pressure difference feedforward-feedback compound control strategy based on sub-domain expert PID controller is designed to improve the linear control characteristics of the independent control system. Based on the proposed solution of the independent control system for import and export, the single actuator motion and the multi-actuator composite motion were tested and studied on the 6T excavator as the test verification platform. The results of theoretical analysis and test show that the energy-saving characteristics of the independent control system can be increased by 39.5%, 36.6% and 32.3% respectively compared with the existing system in the single actuator motion of the boom, bucket rod and bucket. The energy-saving characteristics of the combined movement of the moving arm shovel and bucket, the combined movement of the movable arm bucket and the movable arm bucket can be increased by 20.2%, 25.6%, 27.8% and 20.8%, respectively, and the energy saving characteristics of the combined movement can be improved by 20.2%, 25.6%, 27.8% and 20.8% respectively.
【學位授予單位】:燕山大學
【學位級別】:博士
【學位授予年份】:2016
【分類號】:TU621;TP273
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