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Research on the electro-hydraulic variable valve actuation system based on a three-way proportional reducing valve

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Abstract

As the internal combustion engine moves into the 21st century, fully flexible valve actuation systems are being proposed as an enabling technology for advanced internal combustion engine concepts. Electro-hydraulic valve actuator systems are being considered as a potential variable valve technology. Compared to the servo control system, the system using a proportional valve has the advantages of low price, high anti-pollution ability and high reliability. Our research focuses on exploring the dynamic characteristic of the electro-hydraulic variable valve system, which is based on three-way proportional reducing valve. In this paper, the structure and working principles of the system are described. The dynamic mathematical model of the system is derived. From the analysis of a linearized model and dynamic simulation, it is demonstrated that the system will be stable only if the proportional reducing valve has a positive opening. Some structural factors that affect the system’s dynamic characteristics, such as input signal, the stiffness of the return spring and the pre-tightening force of the return spring, are studied using AMESim. The experimental results coincide with the theoretical and simulated analyses. Further study shows that the dynamic response can be improved effectively by adopting closed-loop control of valve lift.

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Abbreviations

P c :

input pressure of the single-rod hydraulic cylinder

K I :

constant

U :

input voltage signal

A p :

area of the hydraulic cylinder

K :

stiffness of the return spring

X p :

displacement of the piston

X 0 :

initial reduction length of the return spring

F L :

load force

K u :

pulse duty factor

L :

coil inductance

R :

resistance of the coil and amplifier

K e :

velocity back electromotive force coefficient

I :

input current

X v :

displacement of the valve spool

F m :

magnetic force of the proportional electromagnet

m v :

mass of the armature and valve spool

D :

viscous dam** coefficient of the valve spool

F v :

load force of the valve spool

K i :

current-force gain of the proportional electromagnet

K v :

displacement-force gain of the proportional electromagnet

Q L :

flow rate of the load

K q :

flow rate gain coefficient

K c :

flow rate-pressure coefficient

C ip :

inner leakage coefficient of the hydraulic cylinder

V c :

volume of the controlled chamber of the hydraulic chamber

β e :

bulk modulus of elasticity

M p :

total mass of the piston and load

B p :

viscous dam** coefficient of the piston

K ce :

total flow rate-pressure coefficient

C d :

flow rate coefficient

w :

area gradient

Z :

positive opening size

ρ :

oil density

P s :

system pressure

K p :

proportional coefficient

K D :

differential coefficient

K i :

integral coefficient

e :

error

y 0 :

expected valve lift

y f :

feedback of valve lift

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Authors and Affiliations

  1. The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, 310027, China

    J. -R. Liu, B. **, Y. -J. **e & Y. Chen

  2. Ningbo HOYEA Machinery Manufacture Co., Ltd, Ningbo, 315131, China

    Z. -T. Weng

Authors
  1. J. -R. Liu
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  2. B. **
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  3. Y. -J. **e
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  4. Y. Chen
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  5. Z. -T. Weng
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Correspondence to B. **.

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Liu, J.R., **, B., **e, Y.J. et al. Research on the electro-hydraulic variable valve actuation system based on a three-way proportional reducing valve. Int.J Automot. Technol. 10, 27–36 (2009). https://doi.org/10.1007/s12239-009-0004-6

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  • DOI: https://doi.org/10.1007/s12239-009-0004-6

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