针对目前电子驻车系统EPB(electrical parking brake)的执行部件EPB卡钳的EOL(end of line)性能在线测试方法不够完善的现状,引入计算机控制、高精度数据采集、MSA测量系统分析等技术,设计具有快速正反转切换且防过冲功能的测试电路以...针对目前电子驻车系统EPB(electrical parking brake)的执行部件EPB卡钳的EOL(end of line)性能在线测试方法不够完善的现状,引入计算机控制、高精度数据采集、MSA测量系统分析等技术,设计具有快速正反转切换且防过冲功能的测试电路以及模拟EPB卡钳驻车制动机构,研制一套EPB卡钳EOL性能在线测试系统,利用特征点处理算法对测试数据处理,实现对EPB卡钳电流、力值特性的检测和评估,并对系统重复性和不确定度进行评定,测量能力指数均大于1.33,评定结果均符合相关标准。展开更多
Currently,direct braking-force measurement under dynamic conditions requires a considerable modification to the vehicles and has poor compatibility because there are many types of vehicles.Thus,in this paper,an indire...Currently,direct braking-force measurement under dynamic conditions requires a considerable modification to the vehicles and has poor compatibility because there are many types of vehicles.Thus,in this paper,an indirect measurement method of new-energy vehicles,braking force under dynamic braking conditions is proposed.The mechanical wheel and axle model at low/idling/high speeds is established using the piston-pressure formula,force transfer in the brake-wheel cylinder,relative movement between the wheel and the roller,among others.On this basis,the relationship between wheel braking force and roller-linear acceleration is further derived.Our method does not alter existing vehicle structures or sensor types.The standard sealing bolt is temporarily replaced with a hydraulic sensor for coefficient calibration.Afterward,the braking force can be indirectly calculated using the roller-linear velocity data.The method has characteristics of efficiency and high accuracy without refitting vehicles.展开更多
文摘针对目前电子驻车系统EPB(electrical parking brake)的执行部件EPB卡钳的EOL(end of line)性能在线测试方法不够完善的现状,引入计算机控制、高精度数据采集、MSA测量系统分析等技术,设计具有快速正反转切换且防过冲功能的测试电路以及模拟EPB卡钳驻车制动机构,研制一套EPB卡钳EOL性能在线测试系统,利用特征点处理算法对测试数据处理,实现对EPB卡钳电流、力值特性的检测和评估,并对系统重复性和不确定度进行评定,测量能力指数均大于1.33,评定结果均符合相关标准。
文摘Currently,direct braking-force measurement under dynamic conditions requires a considerable modification to the vehicles and has poor compatibility because there are many types of vehicles.Thus,in this paper,an indirect measurement method of new-energy vehicles,braking force under dynamic braking conditions is proposed.The mechanical wheel and axle model at low/idling/high speeds is established using the piston-pressure formula,force transfer in the brake-wheel cylinder,relative movement between the wheel and the roller,among others.On this basis,the relationship between wheel braking force and roller-linear acceleration is further derived.Our method does not alter existing vehicle structures or sensor types.The standard sealing bolt is temporarily replaced with a hydraulic sensor for coefficient calibration.Afterward,the braking force can be indirectly calculated using the roller-linear velocity data.The method has characteristics of efficiency and high accuracy without refitting vehicles.
