Internal Leakage Analysis from Pd to Pc Port Direction in ECV Body Used in External Variable Type A/C Compressor
Solenoid operated electromagnetic control valve
(ECV) playing an important role for car’s air conditioning control
system. ECV is used in external variable displacement swash plate
type compressor and controls the entire air conditioning system by
means of a pulse width modulation (PWM) input signal supplying
from an external source (controller). Complete form of ECV contains
number of internal features like valve body, core, valve guide,
plunger, guide pin, plunger spring, bellows etc. While designing the
ECV; dimensions of different internal items must meet the standard
requirements as it is quite challenging. In this research paper,
especially the dimensioning of ECV body and its three pressure ports
through which the air/refrigerant passes are considered. Here internal
leakage test analysis of ECV body is being carried out from its
discharge port (Pd) to crankcase port (Pc) when the guide valve is
placed inside it. The experiments have made both in ordinary and
digital system using different assumptions and thereafter compare the
 G. H. Lee and T. J. Lee, “A study on the variable displacement
mechanism of Swash plate type compressor for automotive air
Conditioning system” International Compressor Engineering
Conference, Purdue University, Illinois, USA, 2004, pp. 1~6.
 Y. J. Lee, G.H. Lee and B.E. Lim, “Design for Improving the
Performance of a Control Valve in a Variable Compressor”, 4th
International Conference on Sustainable Automotive Technologies,
RMIT University, Melbourne, Australia, 2012, pp. 343~348.
 M. I. Mahmud and H. M. Cho, “Analysis of forces in an automobile
ECV using in external variable displacement swash plate type
compressor for air conditioning control system”, Journal of Mechanical
Science and Technology, Vol. 28, No. 5, 2014, pp. 1979~1984.
 F. Toshiro, M. Kazuo, N. Yoshiyuki and Y. Naoya, “Electromagnetic
control valve”, U. S. Patent US6102668A, 2000.
 M. I. Mahmud, Y. J. Yoon and H. M. Cho, “Leakage Analysis of ECV
in Variable Displacement Swash Plate Type Compressor”, International
Journal of Applied Engineering Research, Vol. 9, No. 11, 2014, pp.