车辆电子稳定性试验中A值计算方法的研究

A值是车辆电子稳定性系统测试中最重要的测量值之一。A值在不同的测试标准中有不同的计算方法,测试值都会受到车辆速度和驾驶员的影响。本文采用试验辨识方法对车辆进行性能辨识,得到车辆在车速为80 km/h的频响函数,通过对频响函数求逆得到稳态侧向加速度为0.3 g所对应的方向盘转角输入A值,避免了试验误差。实例验证表明,计算值与实测值一致性较好。

The A value is one of the most important measured value in ESC test. A value has different calculation methods in the different test standards and its value is affected by vehicle speed and driver. In this paper, the performance identification of the vehicle is carried out by using the experimental identification method. The frequency response function which express vehicle performance at 80 km/h is obtained with test identification method, the steering angle which is A value under 0.3g lateral acceleration is calculated by applying inverse matrix of frequency response function, and the measurement error is avoided. The example verification shows that the calculation results are in good agreement with the experiment results.