刘福水,杨子明,黎一锴,胡若,沈宏继.凸轮-柱塞高压供油系统等压泵油特性研究[J].农业机械学报,2018,49(6):393-399.
LIU Fushui,YANG Ziming,LI Yikai,HU Ruo,SHEN Hongji.Constant Pump Pressure Characteristics in Cam-Plunger High Pressure Fuel System[J].Transactions of the Chinese Society for Agricultural Machinery,2018,49(6):393-399.
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凸轮-柱塞高压供油系统等压泵油特性研究   [下载全文]
Constant Pump Pressure Characteristics in Cam-Plunger High Pressure Fuel System   [Download Pdf][in English]
投稿时间:2017-12-15  
DOI:10.6041/j.issn.1000-1298.2018.06.047
中文关键词:  柴油机  供油系统  等压喷射  凸轮型线  匹配设计
基金项目:国家自然科学基金项目(51606010)
作者单位
刘福水 北京理工大学 
杨子明 北京理工大学 
黎一锴 北京理工大学 
胡若 北京理工大学 
沈宏继 63963部队 
中文摘要:凸轮型线直接影响压油柱塞的运动规律,从而影响其泵油特性,是高压供油系统设计的关键。以电控单体泵(EUP)为研究对象,采用实验和仿真相结合的方法研究了凸轮型线与泵端压力间的动态关系,结果表明:在一定脉宽范围内,采用等速凸轮的柱塞泵峰值压力随喷油脉宽的增加而增加,但其增速随脉宽的增加逐渐变小,当喷油脉宽足够长时,压力将趋于一定值;采用降速凸轮的柱塞泵,利用压力先增大后减小的特性可以在较短的喷油脉宽内达到近似等压状态。最后以等压泵油特性为目标,提出了不同匹配转速下降速凸轮工作段加速度的计算方法,并为某型发动机匹配设计了供油凸轮型线,获得了良好的等压供油特性和最大循环喷油量。
LIU Fushui  YANG Ziming  LI Yikai  HU Ruo  SHEN Hongji
Beijing Institute of Technology,Beijing Institute of Technology,Beijing Institute of Technology,Beijing Institute of Technology and 63963 Force
Key Words:diesel engine  fuel injection system  constant pressure injection  cam profile  matching design
Abstract:Cam profile is a key point to the design of high-pressure fuel system. It has a direct influence on the movement of the plunger, which affects the pressure characteristics of the pump. Based on the electronic controlled unit pump (EUP), the dynamic relationship between the cam profile and the pumping pressure was studied by means of experiment and simulation. It was found that within a certain period, the peak pressure was increased with the increase of injection duration using a constant speed cam profile, but the rising rate was decreased with the increase of the injection duration, and the peak pressure tended to be a constant value if the duration was long enough. With deceleration cam profile, the pump can reach approximately constant pumping pressure within common engine injection duration by adopting the dynamic performance in transitional period, in which the pressure was increased firstly and then decreased. In order to evaluate the quality of the constant pressure performance, an evaluation parameter was put forward, which was called constant pressure coefficient, and the influence of the acceleration rate in working section on the constant pressure coefficient was studied. Finally, in order to reach the constant pressure characteristic, a selection method of the optimum cam profile was put forward for different matching speeds. A supply cam profile was designed for a certain engine with a -0.013mm/(°CA)2 deceleration rate of working section and a good constant pressure characteristic (10~15°CA injection duration) and maximum cycle injection volume (438mm3) at engine speed of 1200r/min were obtained.

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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