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Development of an electronically controlled variable displacement vane pump for engine lubrication

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Abstract

Lubrication is one of the most important factors in developing internal combustion engines. And vane pumps are known as potential choices for conducting the engine lubrication systems. To better optimize the lubrication performance, an electronically controlled variable displacement vane pump developed from a typical vane pump is newly introduced in this paper. Firstly, the concept and methodology to design properly an electric actuator to provide an additionally degree of pump control by regulating the pump displacement is carefully considered. Secondly, a control logic is developed to manage the operation of the actuator and subsequently, smoothly varying the pump output in order to satisfy any given lubrication profile. Finally, test rigs are setup to investigate the performances of the fabricated actuator and pump prototype. Practical tests are performed to evaluate the effectiveness of the newly pump design over the typical one.

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Abbreviations

M Op_oil_inside :

moment acting on ring due to oil inside ring

M Op_oil_outside :

moment acting on ring due to oil outside ring

M Op_cen :

moment acting on ring due to centrifugal forces of vanes and oil chambers

M OAct :

moment acting on ring due to electric actuator

F Act :

force generated by electric actuator

I ring :

ring moment of inertia

φ :

angular position of ring

φ C0:

initial angle made by vector \(\overrightarrow {O_p C}\) and horizontal axis

φ C :

angle made by vector \(\overrightarrow {O_p C}\) and horizontal axis after a small rotation of the ring, dφ

\(\overline {O_p H}\) :

distance from pivot point to the vertical axis passing through ring acting point C

R :

winding resistance

I :

electrical current

U :

applied voltage

n m :

motor speed

T m :

motor torque

R g :

reduction ratio of transmission gear box

n g :

speed output of gear box

d sc :

screw shaft diameter

γ sc :

elevation angle of screw

p sc :

screw lead

ρ sc :

equivalent friction angle between screw and nut

f sc :

friction coefficient between screw and nut

R trans :

ratio of number of screw rotation and spring displacement

x C :

displacement of ring acting point C in vertical axis

x i :

input i th of fuzzy inference

f j (x i ):

membership function j th of fuzzy input variable x i

mf :

fuzzy output function

δ :

activated factor

μ :

height of consequent fuzzy function

u F :

output of fuzzy inference

u :

motor driving command - final output of fuzzy controller

V max :

maximum motor driving command

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Authors and Affiliations

  1. School of Mechanical Engineering, University of Ulsan, 93, Daehak-ro, Nam-gu, Ulsan, 680-749, South Korea

    Dinh Quang Truong, Bui Ngoc Minh Truong & Kyoung Kwan Ahn

  2. Department of Material Science and Engineering, University of Ulsan, 93, Daehak-ro, Nam-gu, Ulsan, 680-749, South Korea

    Jae Shin Lee

Authors
  1. Dinh Quang Truong
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  2. Bui Ngoc Minh Truong
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  3. Kyoung Kwan Ahn
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  4. Jae Shin Lee
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Correspondence to Kyoung Kwan Ahn.

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Truong, D.Q., Truong, B.N.M., Ahn, K.K. et al. Development of an electronically controlled variable displacement vane pump for engine lubrication. Int. J. Precis. Eng. Manuf. 16, 1925–1934 (2015). https://doi.org/10.1007/s12541-015-0250-7

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  • DOI: https://doi.org/10.1007/s12541-015-0250-7

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