Study on Hybrid Brake Control of Distributed Drive Electric Vehicle
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摘要: 针对分布式驱动电动汽车制动模式切换条件限制能量回收的问题,制定了一种制动工作模式切换条件,设计了一种复合制动控制策略,其中,制动转矩分配采用分层控制的方法,上层控制器计算需求制动力矩,选择制动工作模式,下层控制器根据制动控制策略分配各轮的液压制动力和电机制动力。在建立分布式驱动电动汽车复合制动模型的基础上,利用AMEsim与Simulink在各种行驶工况下进行联合仿真,对所提出的复合制动控制策略进行验证。结果表明,本文所提出的复合制动系统能够准确地切换制动工作模式,在保证车辆的制动效能和稳定性的同时最大程度回收制动能量。Abstract: For the energy recovery by limiting the distributed drive electric vehicle braking mode switching condition, a new braking mode switching condition was set and a new compound braking control strategy was designed, by dividing braking torque distributed strategy into the top-level and the low-level control strategy. The top-level control strategy selected a best braking mode, low-level control strategy distributed the electronic brake force and hydraulic brake force for every wheel. A hybrid brake control model for the distributed drive electric vehicle was built by AMEsim and Simulink, and the simulation analysis of the control strategy was conducted with different driving conditions. The results show that the present control strategy can accurately switch the braking mode, and make the maximum braking energy recovery while keeping the braking stability.
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Key words:
- distributed electric vehicle /
- braking mode /
- braking stability /
- energy recovery
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表 1 制动意图模糊推理规则表
x dx NB NM NS Z S M B VS − − S S S S − S − − S S S S M M − − M M M M B B − − B B B B B VB − − B B B B B 表 2 制动强度模糊推理规则表
x YITU S M B VS VS VS S S S S M M M M B B B B VB VB VB VB VB 表 3 Burckhardt模型参数
路面类型 a1 a2 a3 干水泥 1.11 −15.98 0.55 干沥青 1.16 −15.16 0.55 湿水泥 0.81 −15.83 0.34 湿沥青 0.90 −15.70 0.39 雪 0.35 −15.14 0.12 冰 0.13 −15.38 0.07 表 4 制动安全性要求
初速度/
(km·h−1)满载制动
距离/m空载制动
距离/m制动减速度/
(m·s−2)50 ≤20 ≤19 ≥6.2 -
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