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| 1 | Vehicle Active Steering Control Research Based on Two-DOF Robust Internal Model Control显示文摘Because of vehicle's external disturbances and model uncertainties,robust control algorithms have obtained popularity in vehicle stability control.The robust control usually gives up performance in order to guarantee the robustness of the control algorithm,therefore an improved robust internal model control(IMC) algorithm blending model tracking and internal model control is put forward for active steering system in order to reach high performance of yaw rate tracking with certain robustness.The proposed algorithm inherits the good model tracking ability of the IMC control and guarantees robustness to model uncertainties.In order to separate the design process of model tracking from the robustness design process,the improved 2 degree of freedom(DOF) robust internal model controller structure is given from the standard Youla parameterization.Simulations of double lane change maneuver and those of crosswind disturbances are conducted for evaluating the robust control algorithm,on the basis of a nonlinear vehicle simulation model with a magic tyre model.Results show that the established 2-DOF robust IMC method has better model tracking ability and a guaranteed level of robustness and robust performance,which can enhance the vehicle stability and handling,regardless of variations of the vehicle model parameters and the external crosswind interferences.Contradiction between performance and robustness of active steering control algorithm is solved and higher control performance with certain robustness to model uncertainties is obtained. | WU Jian LIU Yahui WANG Fengbo BAO Chunjiang SUN Qun ZHAO Youqun | 2016 | Chinese Journal of Mechanical Engineering2016，29，4： | 11 |
| 2 | 平衡重式叉车底盘小波网络动态逆内模控制显示文摘提出一种基于小波网络动态逆内模控制方法的平衡重式叉车底盘集成控制策略,实现对叉车主动后轮转向(Active rear wheel steering,ARS)与直接横摆力矩控制(Direct yaw-moment control,DYC)的解耦控制,以消除叉车底盘各子系统间的耦合作用。在分析叉车底盘集成系统可逆性的基础上,确定解耦输入输出变量的匹配关系,建立小波网络动态逆模型并与原叉车底盘系统串联,将叉车底盘系统解耦为输入输出一一对应的两个独立的伪线性系统,实现了叉车底盘系统各控制回路之间的解耦;设计内模控制器对伪线性系统进行内模控制改善系统的响应品质,并进行仿真分析与基于Lab VIEW PXI和ve DYNA的驾驶员在环试验验证。结果表明,基于小波网络动态逆内模控制方法的平衡重式叉车底盘集成控制策略能够消除ARS与DYC之间的干涉和耦合,提升叉车的状态跟踪和操纵稳定性。 | 夏光 陈无畏 赵林峰 汪韶杰 | 2015 | 机械工程学报2015，51，18： | 8 |
| 3 | A Novel Pre-control Method of Vehicle Dynamics Stability Based on Critical Stable Velocity during Transient Steering Maneuvering显示文摘The current research of direct yaw moment control(DYC) system focus on the design of target yaw moment and the distribution of wheel brake force. The differential braking intervention can effectively improve the lateral stability of the vehicle, however, the effect of DYC can be improved a step further by applying the control of vehicle longitudinal velocity. In this paper, the relationship between the vehicle longitudinal velocity and lateral stability is studied, and the simulation results show that a decrease of 5 km/h of longitudinal velocity at a particular situation can bring 100° increasing of stable steering upper limit. A critical stable velocity considering the effect of steering and yaw rate measurement is defined to evaluate the risk of losing steer-ability or stability. A novel velocity pre-control method is proposed by using a hierarchical pre-control logic and is integrated with the traditional DYC system. The control algorithm is verified through a hardware in-the-loop simulation system. Double lane change(DLC) test results on both high friction coefficient(μ) and low μ roads show that by using the pre-control method, the steering effort in DLC test can be reduced by 38% and 51% and the peak value of brake pressure control can be reduced by 20% and 12% respectively on high μ and low μ roads, the lateral stability is also improved. This research proposes a novel DYC system with lighter control effort and better control effect. | CHEN Jie SONG Jian LI Liang RAN Xu JIA Gang WU Kaihui | 2016 | Chinese Journal of Mechanical Engineering2016，29，3： | 8 |
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