0
Research Papers: Flows in Complex Systems

Flow Force Analysis of a Variable Force Solenoid Valve for Automatic Transmissions

[+] Author and Article Information
Gee Soo Lee

Department of Mechanical Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea

Hyung Jin Sung1

Department of Mechanical Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Koreahjsung@kaist.ac.kr

Hyun Chul Kim

 KATECH, 74 Yongjung-Ri, Pungse-Myun, Chonan-Si, Chungnam 330-912, Korea

Hyun Woo Lee

 UNICK, 10-1 Jukgok-Ri, Jhinyoung-Eub, Gimhae-Si, Kyungnam 621-801, Korea

1

Corresponding author.

J. Fluids Eng 132(3), 031103 (Mar 17, 2010) (7 pages) doi:10.1115/1.4001070 History: Received December 11, 2008; Revised January 19, 2010; Published March 17, 2010; Online March 17, 2010

Three-dimensional numerical simulations were carried out to investigate the flow dynamic behavior and pressure characteristics of a variable force solenoid (VFS) valve used in automatic transmissions. To visualize the dynamic movement of the spool, a moving mesh with dynamic layering meshes for varying boundary conditions was employed. Relevant experiment was performed to validate the simulations. The VFS valve was characterized by determining the variation in the equivalent orifice area with the spool displacement. The pressure sensitivity was found to be precisely controlled by the relation between the depth and the area of the notch in the range of the characteristic length of the valve. The results of model C, which takes into account both seal leakage and notches, indicate that there are linear pressure sensitivities in the range of the valve overlap and that there are smooth pressure control characteristics in the range of the two notches. The VFS valve with a spool was shown to have an unavoidable and unique hysteresis, which is caused by the nonlinear electromagnetic forces at the end of strokes of the spool and by the friction forces in the valve overlap. The effects of varying the oil temperature on the pressure sensitivity curves and the seal leakage flow rates were also examined.

FIGURES IN THIS ARTICLE
<>
Copyright © 2010 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

A variable force solenoid valve of an automatic transmission: (a) disassembly and (b) hydraulic component

Grahic Jump Location
Figure 2

Computational domain of the VFS valve

Grahic Jump Location
Figure 3

Computational grids of the VFS valve: (a) overall mesh and (b) dynamic layering mesh

Grahic Jump Location
Figure 4

Schematic diagram of the experimental setup

Grahic Jump Location
Figure 5

Variation of the EOA with spool displacement

Grahic Jump Location
Figure 6

Effects of varying physical model approach: (a) on the pressure sensitivities and (b) on the leakage flow rates

Grahic Jump Location
Figure 7

Static pressure distributions along the seal leakage centerline for model C at 85°C

Grahic Jump Location
Figure 8

Velocity profiles along the notch centerline for model C at 85°C

Grahic Jump Location
Figure 9

Relative velocity contours on the spool wall and the mid section for model C at 85°C; (a) x′=0.08, (b) x′=0.33, (c) x′=0.58, and (d) x′=0.75

Grahic Jump Location
Figure 10

Static pressure contours on the spool wall and the mid section for Model C at 85°C; (a) x′=0.08, (b) x′=0.33, (c) x′=0.58, and (d) x′=0.75

Grahic Jump Location
Figure 11

Effects of varying the notch depth ratio of the delay part: (a) on the pressure sensitivities and (b) on the leakage flow rates

Grahic Jump Location
Figure 12

Effects of varying oil temperature: (a) on the spool displacements and (b) on the pressure sensitivities

Grahic Jump Location
Figure 13

Effects of varying the oil temperature: (a) on the pressure sensitivities and (b) on the leakage flow rates

Grahic Jump Location
Figure 14

Response characteristics of the dynamic performance test: (a) on and (b) off

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In