Control of Parallel-Series Hydrostatic Hybrid Vehicl

• Main Authors: Wei-Ting Chan, 陳韋廷
• Other Authors: Kuo-Ching Chiu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/k4f957

碩士 === 國立虎尾科技大學 === 機械與機電工程研究所 === 100 === In this thesis, a simulation of “hydrostatic transmission hybrid electric vehicle” with shift control scheme is developed by integrating a “parallel-series hydrostatic-transmission system”and a “parallel hybrid electric vehicle system”. The parallel-series hydrostatic-transmission system, using a 2-DOF planetary gear set to coupled with a hydrostatic package (consist of a reversible variable-displacement hydraulic pump/motor and accumulator), can replace the conventional continuously variable transmission (CVT) to optimize energy economy. With this hydrostatic system, nearly all of the energy typically lost during vehicle braking is captured and used to propel the vehicle the next time it needs to accelerate. Compare with conventional CVT system, the benefits of hydrostatic-transmission system include: better energy economy, better acceleration, less brake maintenance, and longer battery life. By applying Matlab&Simulink software to build the related mathematic equations of sub-models, a backward vehicle dynamic model had been established by inputting the driving constraint criteria according to the present regulations to simulate the output responses of the components of the hybrid vehicle. This research uses basic rule-based strategy to simulate the hydrostatic transmission hybrid electric vehicle performance running in different parameters or the control strategies. For optimizing energy economy and smoothing shift control, a genetic algorithm (GA) based parameters optimization is proposed to choose the power sources swithing points in the hybrid system. The simulation results showed that the use of accumulator in accumulating braking energy and two-source operation mode allows hybrid electric vehicle driving on high speed in a full-power battery status, and avoids the battery power insufficient status occurring. In summary, this research constructs a hydrostatic transmission hybridelectric vehicle simulation system. It provides the characteristics of changing the design parameters and the controlled parameters rapidly, and a quick reference for designing as well as shortening the designing procedure, which could reduce the hybrid vehicle cost and increase the commercial competitive ability of the products.