Research On Active Suspension Technology Based On Inertial Control

Research and exploitation of vehicle suspension and vehicle vibration control system is an active international forward researching issue in vehicle dynamics and control field. With social and technological development, owing to restriction by its own structure, passive suspension cannot have met people's requirement for vehicle running smoothness, riding comfort and manipulation stability. Thus, active suspension system followed, for it can not only well isolate the vibration of vehicle body caused by pavement interference, but also can adjust the body posture according to its own initiative output, even can make the vehicle keep good stability and security in bad highway condition or in the situation of frequent intense changes of speed. Therefore, further research and exploitation of active suspension technology is of important practical significance, and the application prospect is very broad.This dissertation, combining with the program named "Research on inertial adjustment active/semi-active suspension technology" which is one of planning projects of the new century excellent talent funded by education ministry and the program named "Research on inertial control suspension technology" which is one of key planning projects of technology development in Jilin province, takes the inertial technology, usually applied to sense the posture of moving objects and control the moving trajectory, to use in research of vehicle active suspension system. Moreover, with a goal to restrain the motion of vehicle body, such as pitching, bouncing, and rolling, caused by various kinds of interference during the course of driving, this paper makes a systemic research on the control strategy and control algorithm of active suspension based on inertial control.In this paper, it brings inertial technology into the control of active suspension. And it gets information of vibration and posture of vehicle body through an autonomous measurement, which is inertial measurement technique. This dissertation, after modeling and analysis no 1/4 vehicle active suspension with two degrees of freedom, 1/2 vehicle active suspension with four degrees of freedom and a whole vehicle active suspension with seven degrees of freedom, puts forward a decentralized control strategy of large-scale system based on inertial adjustment. First, the strategy scatters to transform the information of vibration and posture of vehicle body, so that we can convert control of the whole vehicle body into control of 1/4 vehicle body. Then it respectively uses fuzzy PID control algorithm of self-tuning parameters to control the subsystem of active suspension. To test the active suspension technology, this paper also researches mechanical and hydraulic structure of active suspension based on AMESim and simulation mode of controller based on Simulink. Then this paper puts forward a co-simulation program for the whole active suspension system, so that it provides active suspension technology with a convenient, visual, and effective co-simulation platform.Simulation experiment about the active suspension inspired by bag piece pavement and random road proves that the control program about active suspension of whole vehicle which is proposed in this paper is practical and efficient. The simulation experiment also shows that when the subsystem of active suspension was under the control of fuzzy PID control algorithm of self-tuning parameters, the active suspension can effectively reduce the amplitude of vibration, so that vehicle body can rapidly return to steady state, which indicates that the active suspension could apparently effectively restrain the pitching, bouncing, and rolling motion of vehicle body. At last, after all the research and simulation analysis above, we conclude that the technology of active suspension, based on inertial control, which is proposed in this paper, is practical and efficient, and can dramatically improve vehicle dynamic performance. Therefore, it is a new idea to introduce inertial technology to the control of active suspension, and it maintains important practical value and significance of research.