Control Performance Improvement of an EMV System Using a PM/EM Hybrid Actuator

다국어 초록 (Multilingual Abstract)

In this study, we improved control performance of an EMV (electromechanical valve) system using a PM/EM (permanent magnet/electromagnet) hybrid EMA (electromagnetic actuator) and showed the feasibilities of both soft landing and fast transition of the EMV system using a simple PID control. The conventional EMV systems using only EM show significant nonlinear characteristics. Therefore, it is very difficult to control the valve position and several complex control schemes are used. This paper focused on the control performance improvement using a PM/EM hybrid actuator. In particular, a PM is used as a key design parameter such as a bias current of a magnetic bearing in order to improve the linear characteristic of the actuator, although most PM/EM hybrid actuators use a PM as a power saver during valve-open and -closed states. First, a FE (finite element) analysis was performed to confirm its linear static force characteristics. Then, both a test rig and a valve control system were built in order to prove experimentally the control performance improvement of the actuator. Finally, feasibilities of both soft landing and fast transition of the system were shown experimentally through gain-scheduled PID (proportional derivative integral) control.

참고문헌 (Reference)

1 Peterson, K. S.,, "Virtual lash adjuster for an electromechanical valve actuator through iterative learning control" 2003

2 Kluting, M, "The third generation of valvetrains ？ New fully variable valvetrains for throttlefree load control" 2000

3 Peterson, K. S, "Nonlinear self-tuning control for soft landing of an electromechanical valve actuator" 207-212, 2002

4 Pischinger, M.,, "Low fuel consumption and low emissions-Electromechanical valve train in vehicle operation" 1 (1): 17-25, 2000

5 Lee, S. H, "Fine Motion Control Characteristics of Magnetically Levitated (MAGLEV) Ultra Precision Stage Using PM/EM hybrid Magnetic Bearing" 2001

6 Pulkrabek, W. W, "Engineering Fundamentals of the Internal Combustion Engine" Prentice-Hall 1997

7 Okada, Y.,, "Electromagnetic valve actuator for automobile engines" 2004

8 Park, S. H.,, "Effect of design and operating parameters on the static and dynamic performance of an electromagnetic valve actuator" 217 : 193-201, 2003

9 Chang, J. U.,, "Design parameter study of a permanent magnet biased magnetic actuator for improving stiffness and linearity" 21 (21): 1218-1225, 2007

10 Lee, S. H.,, "Design of novel permanent magnet biased linear magnetic bearing and its application to high-precision linear motion stage" 543-548, 2002

11 Ahn, H. J.,, "Control-relevant identification of the MIMO AMB rigid rotor: The design of an optimal controller for the magnetic bearing system" 39 (39): 299-307, 2003

12 "Control of an electromechanical camless valve actuator" 262-267, 2002

13 "Control of an electromechanical actuator for camless engine" 3113-3118, 2003

14 "A novel cost-effective scheme of power amplifier for AMBs using space vector technology" 101-105, 2002