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根据主要元件的产热和散热特征,建立液压系统热平衡数学模型。基于ADAMS和AMESim软件建立了装载机工作装置的动力学仿真模型和热液压系统联合仿真模型。仿真结果表明:由各种阀的功率损失而产生的热量约占总产热量的40%,是系统主要的产热源;液压油通过散热器前、后的温差约为10℃,散热器散热功率较低;环境温度越高热平衡温度越高。为了增大散热量,将风扇由机械驱动改为温控液压驱动,同时并联温控节流阀,结构改进后系统散热效率明显提高,热平衡温度满足工作要求,研究结果对装载机整车热管理系统的结构优化和控制策略的制定提供了指导。
According to the characteristics of heat and heat dissipation of the main components, a mathematical model of heat balance of hydraulic system is established. Based on ADAMS and AMESim software, a dynamic simulation model and a hydrothermal system co-simulation model of a loader working device are established. The simulation results show that the heat loss caused by the power loss of various valves accounts for about 40% of the total heat production, which is the main heat source of the system. The temperature difference between the front and the rear of the hydraulic oil through the radiator is about 10 ℃. Lower; the higher the ambient temperature, the higher the thermal equilibrium temperature. In order to increase the heat dissipation, the fan is changed from mechanical drive to temperature-controlled hydraulic drive, meanwhile, the temperature-controlled throttle valve is connected in parallel. The cooling efficiency of the system is obviously improved after the structure is improved, and the heat balance temperature meets the work requirement. System structure optimization and control strategy to provide guidance.