汽车制动部件耐压破坏测试系统的设计

Design of test system for pressure damage of automobile braking parts

针对企业为同时满足乘用车、商用车制动部件高、低液压耐压破坏测试的要求,基于计算机控制系统和高低压分区控制模式设计汽车制动部件液压耐压破坏测试系统。采用电气比例阀加气液增压器增压伺服控制方式,可实现0~3 MPa的低液压控制,控制准确度为±0.05 MPa,满足商用车制动部件耐压破坏测试需求;电气比例阀加气驱液泵增压伺服控制方式,可实现3~40 MPa的高液压控制,控制准确度为±0.1 MPa,满足乘用车制动部件耐压破坏测试需求;系统采用计算机控制电磁阀实现高低压耐压测试的自动切换,实现测试过程的自动化。系统增压速率10~500k Pa/s连续可设,共设5级升压台阶逐级加压。对测试系统进行不确定评定,低压耐压破坏测试不确定度<0.042 MPa,高压耐压破坏测试不确定度<0.057 MPa,测试结果表明汽车制动部件耐压破坏检测系统满足测试需求。

To achieve the enterprises'requirements of high and low hydraulic tests pressure damage for brake parts of both passenger and commercial vehicles,hydraulic pressure damage system test of the automobile brake parts is designed based on the computer control system and high the and low pressure zone control mode.By adopting electric proportional valve and booster air-hydraulic servo control method,0-3 MPa low hydraulic control can be achieved with control being accuracy±0.05MPa,which meets the pressure damage test requirements for commercial vehicle parts brake;Meanwhile,by adopting electric proportional valve and air-driving hydraulic pump servo pressurization control method,3-4 0 MPa high hydraulic control with accuracy being±0.1 MPa can achieved,which be meets the pressure damage test requirements for passenger vehicle brake parts.system The adopts computer control solenoid valve to realize the automatic switch of the high and pressure low test and realize the automation of the test process.System pressurization rate 10-500 is kPa/s continuously settable and it is provided with 5 step-up steps for step-by-step pressurization.Uncertainty assessment is also carried out for the test system,and the uncertainty of low-pressure damage test is less than 0.042 MPa,and uncertainty of high-pressure damage test is less than 0.057 MPa.The test results show that the pressure damage test system for brake meets parts of vehicle the test requirements.