基于动力悬置优化的商用车转向盘怠速抖动控制研究

Research on Control of Steering Wheel Idle Wobbling Based on Engine Mount System Optimization for Commercial Vehicle

针对某型商用车转向盘怠速抖动问题,对其动力总成悬置系统固有特性和隔振性能进行了研究。综合考虑发动机悬置系统解耦度、振动传递率和谐振频率,建立了发动机悬置优化模型,并基于多目标融合粒子群优化方法获得了最优悬置系统参数。通过整车试验表明,优化改进后发动机隔振率在整个转速范围内明显提升,转向盘Z向振动加速度由原来的8.9 m/s^2降至0.9 m/s^2,有效解决了转向盘怠速抖动剧烈问题。

To eliminate steering wheel idle wobbling of a commercial vehicle, the inherent characteristics and vibration isolation performance of the engine mount system were studied. A optimized model of engine mount system was established that took into account the decoupling degree, vibration transmissibility and resonant frequency of the engine mount system. The optimal mount system parameters were obtained by muhi-objective particle swarm optimization. Vehicle test results show that engine vibration isolation frequency is improved substantially in the whole speed range, and vibration acceleration along Z direction of steering wheel is reduced fl＇om 8.9 m/s2 to 0.9 m/s2, which effectively eliminates steering wheel idling wobbling.