유공압시스템학회논문집 (Transactions of The Korea Fluid Power Systems Society)
- 제4권1호
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- Pages.18-24
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- 2007
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- 1738-3315(pISSN)
임베디드 시스템을 이용한 CVT 유압시스템 제어
A Control of CVT Hydraulic System using Embedded System
- 한기원 (성균관대학교 대학원 기계공학과) ;
- 류완식 (현대파워텍) ;
- 장인규 (성균관대학교 대학원 기계공학과) ;
-
전재욱
(성균관대학교 정보통신공학부) ;
- 김현수 (성균관대학교 기계공학부) ;
- 황성호 (성균관대학교 기계공학부)
- Han, K.W. ;
- Ryu, W.S. ;
- Jang, I.G. ;
-
Jean, J.W.
;
- Kim, H.S. ;
- Hwang, S.H.
- 발행 : 2007.03.01
초록
The continuously variable transmission (CVT) of which speed ratio can change continuously in a fixed range has the benefits of low fuel consumption and exhaust gas because it enables the engine of a vehicle to operate in a high efficiency range regardless of vehicle speed. The speed ratio of belt type CVT is controlled by adjusting line pressure. The one of the line pressure control methods, mechanical-hydraulic control is usually adopting VDT's control method, in which the secondary solenoid valve has two functions both a regulator and a line pressure controller. However, this control method could not show the high performance of CVT with optimal driving capability because of the limitation of simple control algorithm, and it could not gain market share sufficiently in spite of the advantage of CVT with low fuel consumption. On the other hand, the electro-hydraulic control method gives the enhancement of power performance and low fuel consumption by implementing various driving mode using the proportional control or PWM control. The key of CVT technique is to develop a control algorithm of the electro-hydraulic solenoid valve in order to implement the speed ratio efficiently. In this paper, the line pressure control algorithm is proposed and the hydraulic system is controlled using metal belt type CVT test rig and the embedded ECU platform.