Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (4): 773-780.doi: 10.13229/j.cnki.jdxbgxb20200895

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Analysis on pressure fluctuation of hydraulic variable valve actuation

Zhao-hui JIN1(),Le-qi GU1,Wei HONG1,Fang-xi XIE1(),Tian YOU2   

  1. 1.State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130022，China
    2.Engineering Branch，Changchun University of Technology，Changchun 130033，China
  • Received:2020-09-07 Online:2022-04-01 Published:2022-04-20
  • Contact: Fang-xi XIE E-mail:jinzhaohui@jlu.edu.cn;xiefx2011@jlu.edu.cn

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Abstract:

The pressure fluctuation of the hydraulic variable valve actuation system may be produced in the actual operation， which will affect the performance of the variable valve actuation. In this paper， the reason and trend of pressure fluctuation are analyzed by combining experiment and simulation， and effective measures are taken to reduce pressure fluctuation. It is found that the key parameters such as valve spring stiffness， valve piston mass and the diameter size of the thin-walled hole，all have effect on the system pressure fluctuation. The research shows that when the valve-seating velocity is less than 0.5 m/s， the pressure fluctuation can be effectively reduced by choosing a larger thin-walled hole. The pressure fluctuation amplitude can be reduced by increasing the valve spring stiffness. The pressure fluctuation can be decreased by reducing the valve piston mass. When the diameter of valve piston increases， the pressure fluctuation amplitude decreases significantly， which can be reduced by 2.719 MPa at most. By reducing the total hydraulic fluid volume of the system can reduce the number of pressure fluctuations.

Key words: dynamic mechanical engineering, hydraulic variable valve actuation, AMESim, hydraulic pressure fluctuation, valve-seating velocity, valve movement characteristics

CLC Number: 

  • TK417

Fig.1

Three-dimensional model of cam-driven hydraulic variable valve actuation"

Fig.2

Configuration of the testbed"

Tab 1

Test equipment"

名 称厂 家型 号
角标仪奇石乐2613B
差动位移传感器上海江晶翔电子KDW?25?V1
高速数据采集卡北京瑞博华RBH8362
压电式压力传感器奇石乐6067C1Q01
燃烧分析仪DEWETRON2010
变频器广州三晶电气SAJ8000
节流阀海德福斯NV10?22

Fig.3

Schematic diagram of hydraulic system"

Fig.4

Experimental curves of valve lift"

Fig.5

Experimental curves of valve piston cavity pressure"

Fig.6

AMESim simulation model"

Fig.7

Distribution of different thin-walled hole diameter to valve lift， valve piston cavity pressure and valve?seating velocity at 2400 r∕min"

Fig.8

Distribution of different thin-walled hole diameter to valve lift， valve piston cavity pressure and valve-seating velocity at 3600 r∕min"

Fig.9

Distribution of different valve spring stiffnesses corresponding to valve piston cavity pressure"

Fig.10

Distribution of different valve piston masses corresponding to valve piston cavity pressure and valve lift"

Fig.11

Distribution of different valve piston diameter corresponding to valve piston cavity pressure， valve piston cavity flow and valve lift"

Fig.12

Distribution of different hydraulic oil total volumes corresponding to valve piston cavity pressure"

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