Self-Powered Active Suspension For Vehicle

Suspension is the key component of vehicle, which relate to the quality of vehicle running. With the increase of vehicle's speed, the disadvantages of passive suspension become more and more obvious. Active suspension is effective way to improve the quality of vehicle running, reduce the vibration, it have better isolation performance than semi-active and passive systems. But conventional active suspension requires external energy, this limite it's application. In order to resolve this problem, a new suspension is proposed, which is called self-powered active suspension (SPAS). The feature of the new suspension is that when vibration of system is reduced, the vibration energy can be converted into electrical power and be stored in the capacitor, the active force can be generated from the electrical energy to control the motion of systems.Firstly, the configuration and principle of the SPAS are introduced in the paper, the parameters and structures of the Dc motor actuator, drive and energy accumulation circuit and storage battery are analyzed based on the development actuality of the internal and overseas mechanical and electric technology. Secondly, the active suspension for automobile is analyzed and designed, respectively for the 2-DOF and 4-DOF vehicle system, the LQG controller is designed, and the conditions insuring the energy balance are analyzed; the systems' performances using LQG controller are simulated in Matlab/Simulink, and then according to the simulation results, the parameters of the Dc motor actuator are designed. Thirdly, for the 4-DOF vehicle system, the sliding mode controller and PID-Fuzzy controller are designed; respectively using the two controllers, the systems' performances are simulated in Matlab/Simulink, and then the performances' simulation results using the sliding mode and PID-Fuzzy controllers are compared with the results using LQG controller. Finally, the SPAS are applied on the railway vehicle, For a 4-DOF reduced half carbody lateral suspension model, the LQG controller is designed, the conditions insuring the energy balance are analyzed. The systems' performances are simulated in Matlab/Simulink; and then using this LQG controller, the systems' performances of 7-DOF and 17-DOF lateral suspension models are respectively simulated. In the paper, the feasible projects of the SPAS system's configuration and design are proposed. Via calculation and simulation, the conditions insuring the energy balance, dynamic performance of the system and the quantum of the regenerative energy feeded back to the capacitor are gained. Based on the simulation results, the parameters of the Dc motor actuator are designed. This works lay foundations for the intending research and design of the SPAS.