基于DFSS的汽车制动踏板感觉优化设计

Automobile Brake Pedal Feel Optimization Based on DFSS

基于DFSS方法,针对某车型开发过程中制动踏板感觉存在"偏软"的问题,对制动减速度低于0.3 g的制动工况下的制动踏板力和制动踏板行程进行优化设计。首先,通过用户新车性能调查数据及客户呼声,确定客户关注的性能指标;其次,通过制动性能试验获取上述性能指标与制动减速度的关系,并对试验结果进行分析确定目标值;然后,结合制动系统开发经验,通过普氏选择方法,确定制动系统配置的最优方案;最后,分析并确定控制因子和噪声因子,通过正交试验获得制动踏板力和制动踏板行程的优化值,并与目标值进行对比。结果表明,优化值和目标值有良好的吻合度,为后续优化提供了经济、有效的方法。

Based on the method of the design for six sigma (DFSS), the brake pedal force and brake pedal travel was optimized in the condition of the brake deceleration speed below 0.3 g, to solve the softness of the brake pedal feel in the vehicle development. Firstly, the survey data of users’ new cars performance and the voice of customer (VOC) were used to obtain the customer concerning performance index. Secondly, the relationship between the above index and the brake deceleration was acquired by means of brake performance tests. The experimental result was analyzed to ensure target values. Thirdly, the optimal plan for brake system was determined by development experience as well as the Pugh concept selection. Finally, the control factors and noise factors were analyzed and identified. The optimal values of the brake pedal force and brake pedal travel were obtained by orthogonal experiment. The result showed that the optimal values were well consistent with the target values, which may provide an economical and effective way to optimize brake pedal feel further.