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Research Papers: Flows in Complex Systems

Multiphysics Analysis of a Linear Control Solenoid Valve

[+] Author and Article Information
Gee Soo Lee

Department of Mechanical Engineering, KAIST,
291 Daehak-ro, Yuseong-gu,
Daejeon 305-701, Korea;
Green Car Powertrain R&D Division, KATECH,
74 Yongjung-ri, Chonan-si,
Chungnam 330-912, Korea

Hyung Jin Sung

Department of Mechanical Engineering, KAIST,
291 Daehak-ro, Yuseong-gu,
Daejeon 305-701, Korea
e-mail: hjsung@kaist.ac.kr

Hyun Chul Kim

Green Car Powertrain R&D Division, KATECH,
74 Yongjung-ri, Chonan-si,
Chungnam 330-912, Korea

1Corresponding author.

Manuscript received August 9, 2012; final manuscript received November 12, 2012; published online December 21, 2012. Assoc. Editor: Shizhi Qian.

J. Fluids Eng 135(1), 011104 (Dec 21, 2012) (10 pages) Paper No: FE-12-1380; doi: 10.1115/1.4023079 History: Received August 09, 2012; Revised November 12, 2012

A multiphysics analysis of a linear control solenoid valve coupled with a single degree of freedom (DOF) system is performed to analyze the spool behaviors of the valve. Axially symmetrical simulations are carried out to investigate simultaneously the phenomena of the electromagnetic field and the flow field. The valve spool stroke is determined by the balance between the forces, i.e., the electromagnetic force, hydraulic force, spring force, and damping force. In turn, the spool stroke influences these forces. The arbitrary Lagrangian–Eulerian (ALE) method is employed to describe the dynamic behavior of the system. The simulation results are compared with experimental data to ascertain their accuracy and reliability. In static electromagnetic simulations, a constant electromagnetic force can arise in the linear control solenoid valve because of the leakage of the magnetic flux at the core pole. In the multiphysics simulations, the controllable range of the valve is found to be i = 0.2 – 1.1 A, which is twice the size of that of the electromagnetic simulations. The hydraulic force due to the feedback pressure pushes the spool forward and enables a wider controllable range. Although the supplied pressure improves the system linearity, a critical supplied pressure is required to ensure the linearity of the linear control solenoid valve. The effects of varying the rising time and the maximum external current on the behavior of the valve and its pressure sensitivities are examined.

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References

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Figures

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Fig. 1

The linear control solenoid valve of an automatic transmission (a) components and (b) after assembly

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Fig. 2

Schematic diagram of the forces acting on the spool and the plunger of the linear control solenoid valve

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Fig. 3

Computational grids for the linear control solenoid valve (a) overall mesh and (b) moving mesh

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Fig. 4

Schematic diagram of the experimental setup

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Fig. 5

Electromagnetic forces affecting the plunger stroke of the linear control solenoid valve for various constant external currents

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Fig. 6

Electromagnetic flux densities and vectors in the static electromagnetic simulation (a) xp = 0.1 mm, (b) 0.7 mm, and (c) 1.4 mm at i = 1.2 A

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Fig. 7

Effects of varying the damping coefficient on the electromagnetic field (a) spool stroke with limiters, (b) imaginary spool stroke, and (c) external current

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Fig. 8

Effects of varying the rising time of the external current on the electromagnetic field (a) spool stroke with limiters and (b) external current

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Fig. 9

Effects of hydraulic forces on the multiphysics simulations (a) control pressure, (b) spool stroke with limiters, and (c) external current

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Fig. 10

Effects of hydraulic forces on the multiphysics simulations (a) imaginary spool stroke, (b) electromagnetic and flow forces, and (c) spring force

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Fig. 11

Electromagnetic flux density and static pressure contours at i = 0.6 A (a) electromagnetic simulation and (b) multiphysics simulation

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Fig. 12

Revolution plots of the electromagnetic flux densities and static pressure contours obtained with the multiphysics simulations (a) i = 0 A, (b) 0.5 A, and (c) 1.2 A

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Fig. 13

Effects of varying the supplied pressure on the results of the multiphysics simulations (a) control pressure, (b) spool stroke with limiters, and (c) external current

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Fig. 14

Effects of varying the supplied pressure on the results of the multiphysics simulations (a) control pressure, (b) spool stroke with limiters, and (c) external current

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Fig. 15

Effects of varying the rising time of the external current on the results of the multiphysics simulations (a) control pressure, (b) spool stroke with limiters, and (c) external current

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Fig. 16

Effects of varying the maximum external current on the results of the multiphysics simulations (a) control pressure, (b) spool stroke with limiters, and (c) external current

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