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| 1 | Hierarchical Control of Ride Height System for Electronically Controlled Air Suspension Based on Variable Structure and Fuzzy Control Theory显示文摘The current research of air suspension mainly focuses on the characteristics and design of the air spring. In fact, electronically controlled air suspension(ECAS) has excellent performance in flexible height adjustment during different driving conditions. However, the nonlinearity of the ride height adjusting system and the uneven distribution of payload affect the control accuracy of ride height and the body attitude. Firstly, the three-point measurement system of three height sensors is used to establish the mathematical model of the ride height adjusting system. The decentralized control of ride height and the centralized control of body attitude are presented to design the ride height control system for ECAS. The exact feedback linearization method is adopted for the nonlinear mathematical model of the ride height system. Secondly, according to the hierarchical control theory, the variable structure control(VSC) technique is used to design a controller that is able to adjust the ride height for the quarter-vehicle anywhere, and each quarter-vehicle height control system is independent. Meanwhile, the three-point height signals obtained by three height sensors are tracked to calculate the body pitch and roll attitude over time, and then by calculating the deviation of pitch and roll and its rates, the height control correction is reassigned based on the fuzzy algorithm. Finally, to verify the effectiveness and performance of the proposed combined control strategy, a validating test of ride height control system with and without road disturbance is carried out. Testing results show that the height adjusting time of both lifting and lowering is over 5 s, and the pitch angle and the roll angle of body attitude are less than 0.15?. This research proposes a hierarchical control method that can guarantee the attitude stability, as well as satisfy the ride height tracking system. | XU Xing ZHOU Kongkang ZOU Nannan JIANG Hong CUI Xiaoli | 2015 | Chinese Journal of Mechanical Engineering2015，28，5： | 13 |
| 2 | Generalized Internal Model Robust Control for Active Front Steering Intervention显示文摘Because of the tire nonlinearity and vehicle's parameters'uncertainties,robust control methods based on the worst cases,such as H_∞,μsynthesis,have been widely used in active front steering control,however,in order to guarantee the stability of active front steering system(AFS)controller,the robust control is at the cost of performance so that the robust controller is a little conservative and has low performance for AFS control.In this paper,a generalized internal model robust control(GIMC)that can overcome the contradiction between performance and stability is used in the AFS control.In GIMC,the Youla parameterization is used in an improved way.And GIMC controller includes two sections:a high performance controller designed for the nominal vehicle model and a robust controller compensating the vehicle parameters'uncertainties and some external disturbances.Simulations of double lane change(DLC)maneuver and that of braking on split-μroad are conducted to compare the performance and stability of the GIMC control,the nominal performance PID controller and the H_∞controller.Simulation results show that the high nominal performance PID controller will be unstable under some extreme situations because of large vehicle's parameters variations,H_∞controller is conservative so that the performance is a little low,and only the GIMC controller overcomes the contradiction between performance and robustness,which can both ensure the stability of the AFS controller and guarantee the high performance of the AFS controller.Therefore,the GIMC method proposed for AFS can overcome some disadvantages of control methods used by current AFS system,that is,can solve the instability of PID or LQP control methods and the low performance of the standard H_∞controller. | WU Jian ZHAO Youqun JI Xuewu LIU Yahui ZHANG Lipeng | 2015 | Chinese Journal of Mechanical Engineering2015，28，2： | 7 |
| 3 | 万能式断路器双刀轴承冲击疲劳寿命仿真与试验研究显示文摘某万能式断路器的双刀轴承在操作机构合/分闸过程中承受交变冲击载荷,需要校核其冲击疲劳强度。引入了基于累积损伤的寿命预估方法,并利用该方法对双刀轴承的冲击疲劳寿命进行估算。理论分析结果与试验结果较吻合,表明该方法能有效预估承受单向循环冲击载荷零件的疲劳寿命。 | 王晓军 陈正馨 许文良 | 2019 | 电器与能效管理技术2019，0，7： | 5 |
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