商用车混合动力电控转向系统的操稳性与节能性

Handling stability and energy-saving of commercial vehicle electronically controlled hybrid power steering system

为了提高重型商用车的高速转向"路感",并降低转向系统能耗,在电液复合式转向系统的基础上提出了一种带有助力矩耦合装置的混合动力电控转向系统(electronically controlled hybrid po-wer steering system,ECHBPS).阐述了ECHBPS的结构组成和工作原理,以降低转向系统能耗为目标,对液压助力子系统参数进行了重新匹配,根据驾驶员在不同车速下偏好的转向盘力矩,设计了电动助力子系统和液压助力子系统的助力特性曲线,建立了ECHBPS功率损耗模型.进行了Matlab/Simulink与Trucksim的联合仿真,结果表明:与传统的液压助力转向系统(hydraulic power stee-ring system,HPS)比较,在原地转向工况下,ECHBPS转向轻便性提高了21.3%;在转向盘中心区转向工况下,ECHBPS的转向"路感"提高了108.96%;在转向工况及直线行驶工况下,ECHBPS能耗分别降低了15.74%和62.61%.

To improve the steering feeling at high speed and reduce the energy consumption of power steering system for heavy-duty commercial vehicles, a novel electronically controlled hybrid power steering system (ECHBPS) with assist torque coupling device was proposed based on the electro-hydraulic steering system. The structures and working principles of ECHBPS were introduced, and the parameters of hydraulic subsystem were reset to reduce the steering system energy consumption. The assist characteristic curves of the electrical and hydraulic subsystems were designed according to driver preferred manoeuvring torque at different speeds, and the model of ECHBPS energy wastage was established. The co-simulation of Matlab/Simulink and Trucksim was conducted. The results show that compared with the hydraulic power steering system(HPS), the steering portability of ECHBPS is improved by 21.3% under the parking manoeuvring condition, and the steering feeling under the on-center steering condition is improved by 108.96%. The energy consumption values are reduced by 15.74% under the steering condition and by 62.61% under the straight-driving condition, respectively.