某适时四驱纯电动乘用车减速器Clunk问题分析与优化

由于纯电动乘用车动力系统的“硬连接”特点和电驱系统的瞬时响应特性,整车行驶过程中载荷瞬时交变工况下常会出现表现为金属敲击噪声和整车抖动的Clunk问题,严重影响整车舒适性。文章以某适时四驱纯电动乘用车前置减速器Clunk问题为例,系统地阐述了Clunk问题的测试分析与排查过程,并提出减小行半齿间隙的优化方案。有效解决了该车型四驱状态下低速行驶过程中Tip-in和Tip-out工况时出现的Clunk问题,具有较强的工程实操性。对于解决类似的电驱动系统Clunk异响问题,具有重要的工程指导意义。

Vehicle Active Damping Control with Considering Time Delay

A model predictive control（ MPC） based active damping controller for automotive driveline oscillations with time-delay consideration is proposed. A simplified driveline model considering time delay is modeled and converted to a linear parameter varying state space equation. Based on the model and model predictive control theory,an active damping controller is designed for drivability and comfortability improvement. In order to verify the designed controller,a driveline with engine is modeled to simulate the tip-in/out driving operation. An MPC active damping controller without considering time delay is simulated together with the proposed controller. The simulation results show that,by adopting the new MPC active damping controller,the vibration of the vehicle is reduced and the drivability and comfortability are improved.

纯电动汽车动力传动系统多间隙对瞬态振动特性的影响

纯电动汽车驱动电机,输出扭矩变化快,且动力传动系统中分布多个间隙,如差速器半轴齿轮间隙、输入轴花键间隙、半轴齿轮花键间隙等,使纯电动汽车在Tip-in/out工况下产生明显的振动噪声,严重影响整车舒适性。为探究纯电动汽车动力传动系统中多间隙参数对系统动力学响应的规律,建立了适用于瞬态工况的动力传动系统模型,通过台架试验验证了其准确性。通过DOE试验设计对差速器半轴齿轮间隙、输入轴花键间隙、半轴齿轮花键间隙等参数进行了灵敏度分析,确定了关键影响参数。通过多参数优化分析,获得了最优参数组合,显著降低Tip-in/out工况下的振动。