对置式液压自由活塞发动机新型同步策略仿真研究  

Simulation research on the new synchronization strategy of opposed hydraulic free piston engine

作　　者：王明博 汪洋[1] 田智 董翔宇 胥奇 甄旭东[2] WANG Mingbo;WANG Yang;TIAN Zhi;DONG Xiangyu;XU Qi;ZHEN Xudong(State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China;School of Auto‑mobile and Transportation,Tianjin University of Technology and Education,Tianjin 300222,China)

机构地区：[1]天津大学先进内燃动力全国重点实验室,天津300072 [2]天津职业技术师范大学汽车与交通学院,天津300222

出　　处：《武汉大学学报（工学版）》2024年第7期941-949,共9页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:51476113,51776135,51406135)。

摘　　要：针对对置式液压自由活塞发动机两侧活塞的同步运动问题,提出新型控制原理,以两侧活塞上下止点的位移差或两侧活塞的实际上下止点与设定的目标值的偏差为控制信号,利用PI(proportional-integral)控制器控制高压油压力或与低压油路相连接的开关阀来调节两侧活塞的上下止点,使发动机稳定运行。利用Matlab/Simulink建立仿真模型进行分析,结果表明:通过控制高压油压力或控制开关阀可以使两侧活塞上下止点分别都达到平衡,发动机能够稳定运行;同时采用2种策略时,由于2种策略的相互影响,上下止点无法都达到平衡;以实际上下止点和上下止点目标值的差值为控制信号时,不同目标值对运行结果有影响,且目标值的选取没有可参考的准则,因此其实际效果不如以两侧位移差为控制信号。在受到扰动时,所提出的控制策略具有较好的鲁棒性。Aiming at the problem of the synchronous movement of the pistons on both sides of the opposed hydraulic free piston engine,a new control principle is proposed,which takes the displacement difference of the top and bottom dead points or the deviation between the actual and the set target values of the pistons of the top and bottom on both sides as the control signal.The proportional-integral(PI)controller is used to control the high-pressure oil pressure or the on-off valve connected to the low-pressure oil circuit to adjust the top and bottom dead points of the pistons on both sides to make the engine run stably.Matlab/Simulink is used to establish a simulation model for simulation analysis.The results show that by controlling the high-pressure oil pressure or the on-off valve,the top and bottom dead points of the pistons on both sides can be balanced respectively,and the engine can run stably.When the two strategies are used at the same time,due to the mutual influence of the two strategies,the top and bottom dead points cannot reach the balance.When the difference between the actual and the target values of the top and bottom dead points is used as the control signal,different target values has an impact on the running results,and there is no reference criterion for the selection of the target value,so the actual effect is not as good as that of the control signal with the displacement difference on both sides.When disturbed,the proposed control strategy has good robustness.

关 键 词：对置式 液压自由活塞发动机 同步控制 MATLAB/SIMULINK仿真 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]