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以载重量为220 t的电动轮矿用自卸车液压制动系统为研究对象,对其工作原理进行理论分析,利用AMESim仿真平台,结合各组成元件的输出特性曲线,建立各主要组成元件的仿真模型,并搭建整个液压制动系统的仿真模型。依据《土方机械轮胎式机器制动系统的性能要求和试验方法》(GB/T 21152—2007),对行驶速度低于8 km/h时的制动工况及速度为30 km/h且电制动失效时的制动工况进行模拟仿真,以达到对正在研制的220 t电动轮矿用自卸车制动性能的验证和预测目的。结果表明,该液压制动系统的行车制动压力和电制动失效时的制动压力均满足车辆制动要求。
Taking the hydraulic braking system of electric wheel loader dump truck with a carrying capacity of 220 t as the research object, the working principle of the hydraulic braking system is analyzed theoretically. Using the AMESim simulation platform and the output characteristic curves of the components, the simulation of each main component is established Model, and build the entire hydraulic braking system simulation model. According to “Performance requirements and test methods for earth-moving machinery tire-type machine brake system” (GB / T 21152-2007), the braking conditions at speeds lower than 8 km / h and at speeds of 30 km / h and Braking conditions of braking failure simulation, in order to achieve the development of the 220 t electric wheel mining truck braking performance verification and prediction purposes. The results show that the service brake pressure of the hydraulic brake system and the brake pressure in the event of an electrical brake failure satisfy the requirements of the vehicle brake.