并联液压混合动力装载机的系统配置和能源控制策略的研究.doc

Research on the system configuration and energy control strategy for parallel hydraulic hybrid loader Sun Hui, , Jing Junqing Jiangsu Xuzhou Construction Machinery Research Institute, Jiangsu, China Accepted 30 October 2009. Available online 22 November 2009. /10.1016/j.autcon.2009.10.006, How to Cite or Link Using DOI Permissions Reprints Abstract Aimed at the frequent starts/stops operation characteristics of the loader, an energy saving scheme with parallel hydraulic hybrid system is proposed to regenerate and reuse the braking energy normally lost in a conventional loader. Hydraulic hybrid system is designed and sized to capture braking energy from normal–moderate braking operating modes while ensures hybrid system working in higher efficiency region. According to the higher power density characteristic of hydraulic hybrid system, the regenerative braking strategy and energy reuse strategy are designed to coordinate all the powertrain components in an optimal manner while satisfying performance constraints of loader. Energy controller using logic threshold approach is built up to control the dynamic transitions among the various operation modes. Simulation and experimental results show the parallel hydraulic hybrid loader (PHHL) effectively recovered and reused the braking energy, improved the working performance of loader and effectively reduced the fuel consumption. Keywords Loader; Hydraulic hybrid system; Braking energy regeneration; Energy management; Hydraulic pump/motor 1. Introduction With the rising concern in a global scale environmental issue, energy saving in automobiles is a very important subject [1]?and?[2]. Off-road vehicles have been paid much attention in the field of energy saving and environment protection, for the reason of their large application quantities, high fuel consumption and bad emissions [3]. Loader has the characteristics of frequent starts/stops and larger vehicle weight which generated significant amounts of braking energ