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.

中文翻译：

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动态制动条件下新能源汽车制动力的间接测量技术

当前，在动态条件下进行直接制动力的测量需要对车辆进行相当大的修改，并且由于存在多种类型的车辆，因此兼容性差。因此，本文提出了动态制动条件下新能源汽车制动力的间接测量方法。低速/怠速/高速时的机械车轮和车轴模型是使用活塞压力公式，制动轮缸中的力传递，车轮和辊子之间的相对运动等建立的。在此基础上，进一步推导了车轮制动力与滚筒线性加速度之间的关系。我们的方法不会更改现有的车辆结构或传感器类型。将标准密封螺栓临时替换为液压传感器以进行系数校准。之后，制动力可以使用辊线速度数据间接计算。该方法具有效率高，精度高的特点，无需改装车辆。