刘皞春,李志伟,吴钢,周士琳,赵闯.前桥摆转式四驱底盘背压控制系统研究[J].农业机械学报,2018,49(5):404-411.
LIU Haochun,LI Zhiwei,WU Gang,ZHOU Shilin,ZHAO Chuang.Electrical Back Pressure Control System for 4WD Front-axle Articulated Vehicle[J].Transactions of the Chinese Society for Agricultural Machinery,2018,49(5):404-411.
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前桥摆转式四驱底盘背压控制系统研究   [下载全文]
Electrical Back Pressure Control System for 4WD Front-axle Articulated Vehicle   [Download Pdf][in English]
投稿时间:2017-11-21  
DOI:10.6041/j.issn.1000-1298.2018.05.049
中文关键词:  开式液压系统  背压控制  液压底盘  电液比例控制
基金项目:国家高技术研究发展计划(863计划)项目 (2013AA102406-03)
作者单位
刘皞春 华南农业大学 
李志伟 华南农业大学 
吴钢 华南农业大学 
周士琳 华南农业大学 
赵闯 华南农业大学 
中文摘要:前桥摆转式四驱底盘采用发动机-CVT-定量泵为动力源,轮边液压马达为驱动装置的开式液压阀控系统驱动,需要解决底盘在负负载工况下马达超速的问题。为此,提出一种通过对行走马达进油压力实时监测实现液压系统回油背压控制策略,并根据该控制策略为该底盘设计了一回油背压控制系统。通过AMEsim构建了整机的液压力学模型,分析了行走马达在不同工况下的液压特性,制定了回油背压控制策略。对背压控制系统进行了软硬件的设计,并进行样机试验,验证了该系统控制策略的正确性。实现了样机在正负载行驶时能得到最低的回油背压,保证能量利用最大化;样机在负负载行驶时,选择合适的回油背压,确保液压马达在安全范围内运转。
LIU Haochun  LI Zhiwei  WU Gang  ZHOU Shilin  ZHAO Chuang
South China Agricultural University,South China Agricultural University,South China Agricultural University,South China Agricultural University and South China Agricultural University
Key Words:open loop hydraulic system  back pressure control  hydraulic chassis  electro-hydraulic proportional control
Abstract:Driven by a hydraulic open loop system, which consisted of engine-CVT-fixed displacement pump and fixed displacement wheel-motors, a 4WD front axle articulated vehicle is needed to solve the problem when it is walking in negative loads situation. Currently, most of the hydraulic traveling machinery with open-loop system uses the counterbalance valve to control the negative loads. However, traditional counterbalance valves still have the problems of high cost, difficult maintenance and high power consumption. To solve these problems, a vehicle simulation model was built and tested. The control system included an electro-proportional relief valve, a pressure sensor and electronic control system with programmable processor. The electro proportional relief valve was mounted on the outlet port of the hydraulic system. The pressure sensor was installed on the inlet port of the traveling motors. By reading the signal of the pressure sensor, and adjusting the cracking pressure of the electro-proportional relief valve to realize the hydraulic motors meter-out flow control. The results showed that this system can correctly judge the driver’s intension, improve energy efficiency by reducing the cracking pressure when the vehicle working in positive load. When the vehicle working in negative load, the system would choose the suitable cracking pressure to meet the driver’s expectations and keep the hydraulic motors from overrunning.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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