A Study on Integration of Energy Harvesting System and Semi-Active Control for a Hydraulic Suspension System

• Main Authors: Han-Hsiang Liu, 劉翰祥
• Other Authors: 江茂雄
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/90459163739635536443

碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 101 === Suspension systems are used to diminish the vibration of vehicles. The hydraulic damper in conventional suspension systems is mainly designed with the orifices of the piston; however, the vibration energy will be transferred into waste heat. In recent years, conventional gasoline cars and hybrid cars are still used commonly. However, with the gradual depletion of fossil fuels, development of electric vehicles will become the trend in the future. For this reason, the research focuses on recycling energy from the suspension of vehicles to improve the vehicle’s endurance. The purpose of this study is to develop a semi-active suspension control system with an energy harvesting system. Instead of the fixed orifices in conventional cars, two different adjusting damping force methods are studied for the semi-active suspension control system, such as the proportional valve system and the variable resistance circuits system. Thus, we are able to develop semi-active control to improve riding comfort. The energy harvesting system contains a hydraulic gear motor and a DC generator. When vehicles vibrate, the hydraulic damper serves as a hydraulic pump to compress the oil and drive the hydraulic motor. At the same time, the hydraulic motor drives the generator to generate electricity which will be stored in a low-voltage battery. In this study, the test rig contains two configurations, such as the skyhook damper system and the quarter-car system. We first design the novel hydraulic suspension system combining with the energy harvesting system. The simulation of dynamic mathematical model will be performed and analyzed by MATLAB/Simulink. Besides that, the closed-loop semi-active control by the fuzzy sliding mode controller will be realized in the hydraulic suspension system with energy harvesting system. Finally, according to the simulation, we can then set up the test rig for practical experiments. According to the results of the simulation and experiments, the feasibility of the proposed semi-active suspension control system with an energy harvesting system is verified.