Fixed-time Global Prescribed Performance Control for Vehicular Platoons With Actuator Nonlinearities
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摘要: 针对含有执行器非线性的车辆队列控制系统, 提出一种固定时间全局预设性能控制(Global prescribed performance control, GPPC) 控制方法. 首先, 设计一种平滑等效变换, 在同一框架下解决死区及饱和问题, 同时消除执行器非线性固有拐点问题. 其次, 构造两个新型性能函数, 并基于此提出一种全局预设性能控制算法, 实现如下目标: 1) 保证跟踪误差在固定时间内收敛到预定稳态区域; 2) 消除初始误差必须已知的限制; 3) 减小误差的超调量. 然后, 基于上述等效变换及预设性能控制算法, 设计一种固定时间滑模队列容错控制方案, 实现固定时间单车稳定及队列稳定. 最后, 通过 MATLAB 仿真实验, 验证了所提算法的有效性.Abstract: The paper proposes a fixed-time global prescribed performance control (GPPC) scheme for the vehicular platoon system with actuator nonlinearities. A smooth equivalent transformation is first designed, with which both dead-zone and saturation can be handled under the same framework, while the inflection point problem caused by actuator nonlinearities is also dealt with. A global prescribed performance method, based on two novel performance functions, is constructed, while guaranteeing the tracking error converges to a predetermined range within a fixed time, eliminating the limitation that the initial value of the error needs to be known in advance, and reducing the overshoot of the error. Then, based on the proposed equivalent transformation and prescribed performance method, a fixed-time sliding mode fault-tolerant control algorithm is designed to achieve individual vehicle stability and string stability. Finally, the effectiveness of the proposed algorithm is verified by MATLAB simulation experiment.
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表 1 车辆 i 各参数的定义
Table 1 The definition of each parameter of vehicle i
参数 定义 参数 定义 $m_i$ 第 $i$ 辆车的质量 $\rho_a$ 空气质量 $\omega_i(t)$ 外部扰动 $C_{ai}$ 空气动力阻力系数 $g$ 重力加速度 $\theta_i$ 道路坡度角度 $A_i$ 车辆横截面积 $b_i$ 道路阻力滚动系数 $u_i(t)$ 控制输入 $\tau_i$ 发动机时间常数 $\rho_i(t)$ 驱动效率 $r_i(t)$ 偏置故障 -
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