A Study on Optimal Controller Design and System Implementation of a Series Hydraulic Hybrid Vehicle

• Main Authors: HUNG, CHIH-WEI, 洪智偉
• Other Authors: CHEN, CHIH-KENG
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/91526640362706359426

博士 === 大葉大學 === 機械與自動化工程學系 === 104 === As a short- and mid-term solution, hybrid vehicles have aroused the attention of researchers and manufacturers all over the world. In the recent past, studies have indicated hydraulic hybrid vehicles (HHVs) to achieve higher fuel economy by regenerative braking. The function of the control system is to determine how to coordinate the power sources to satisfy power demand and the dynamic constraints in the most convenient way. In this research, a physics-based forward-facing simulation model of series hydraulic hybrid vehicle for a 3.5-ton light-duty truck is first developed, then initial rule-based power management strategies (thermostatic and modulated-pressure) are applied for the proposed system under Japan 1015 and HWFET driving cycles. For further improvement of fuel economy, Dynamic Programming (DP) methodology is then applied to achieve a benchmark solution of the proposed system. DP provides better results than rule-based ones. However, the optimal control rules derived from DP cannot directly apply to the forward-facing system. Instead, results derived by DP are extracted to improve rule-based control strategies. Simulation results of system fuel economy are compared with the standard value of conventional vehicle investigating the improvement of the proposed system. This research designs a series hydraulic hybrid system experiment platform by using the existing hydraulic components. The experiment results are used to evaluate the hydraulic components’ efficiencies and the energy saving of the whole system.