[논문]Auto-Leveling of HID Headlamp Using Preview Control

Yang, Boojoong; Kang, Heeyong; Yang, Sungmo

Auto-Leveling of HID Headlamp Using Preview Control 원문보기

KSME international journal, v.16 no.11, 2002년, pp.1404 - 1411

Yang, Boojoong (School of Mechanical Engineering, Kyungil University) , Kang, Heeyong (School of Mechanical engineering Chonbuk National University) , Yang, Sungmo (School of Mechanical Engineering Chonbuk National University)

Abstract ▼ AI-Helper

A newly developed high intensity discharge (HID) automotive headlamp results in a high luminous gradient at the cutoff line, and proves the superior concept in safer and more com-fortable nighttime driving. This new headlamp technology Provides drivers expanded night vision by a significantly improved light pattern. However, the HID headlamp may dazzle other traffics during traversing a rough road or encountering an unexpected bump. To resolve this problem, an automatic headlamp leveling device is necessary. A preview control is presented for the design of the leveling system. The proposed control algorithm is capable of attenuating a dynamic glare which is one of the major detractors to a driving in dark roads. Computer simulations using ADAMS are carried out to confirm the effectiveness on the control system.

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문제 정의

This study has investigated the usefulness of an automatic headlamp leveling in automotives. The aim of auto-leveling is to reduce vertical aiming error in light pattern.

가설 설정

Therefore, some new requirements have to be added such as safety, electrical conditions, and system lifetime, etc. In this study, we consider only the requirement in safety aspects during driving situations, i.e., the vertical aiming in light pattern.

제안 방법

At least one existing regulation already calls for European regulations governing discharge lighting. Among the notable results of the project, lighting that reduced glare on wet or dark roads helped both the drivers of cars equipped with HID headlamps and the drivers of opposing vehicles. It was also found that the more intense a glare, the more it disturbed oncoming drivers ; the size of the light source affected the level of discomfort.
This study investigates an application of preview control to the automatic leveling of HID headlamps. Preview information about the road profile ahead of the vehicle is utilized to attenuate leveling disturbances against oncoming or prece ding vehicles.

대상 데이터

The hardware may comprise: sensor on the front and/ or rear axles, electronic control unit, stepper or DC motor inside of each headlamp. This system prevents the glare and short visibility distances, provided that the headlamp aiming is correct.

성능/효과

drastically. It is shown that this type of auto-leveler reduced peak leveling error in angular position by a factor of 10~ 12 compared with the headlamp system without an auto-leveling. It is also noted that the effectiveness of the preview control is about twice higher than that of the LQG-control considering the same performance measurement.
It is also noted that the effectiveness of the preview control is about twice higher than that of the LQG-control considering the same performance measurement. This investigation demonstrates that the preview control is well suited for controlling the HID headlamp leveling system.

참고문헌 (13)

ADAMS, User's Manual, MDI, V. 10.0
Bender, E.K., 1968, 'Optimum Linear Preview Control with Application to Vehicle Suspension,' Trans. of ASME, Ser. E., 90-2, pp. 213-221
Foag, W., 1988, 'A Practical Control Concept for Passenger Car Active Suspensions with Preview,' IMechE, pp. 190-196
Guo, L. and Tomizuka, M., 1997, 'High-Speed and High-Precision Motion Control with an Optimal Hybrid Feedforward Controller,' IEEE/ASME Trans. On Mechanics, Vol. 2, No. 2, pp. 110-122

상세보기
Hege, G. and Dahm, H., 1996, 'New Reflection-Type Xenon Headlamps Using HID Technology,' SAE Technical Paper series 960927, pp. 153-156
Huhn, W. and Hege, G., 1995, 'High Intensity Discharge Headlamps (HID)-Experience for More Than 3-1/2 Years Commercial Application of Litronic Headlamps,' SAE Technical Paper series 950591, pp. 63-67
Inman, D., 1994, Engineering Vibration, Prentice-Hall, Inc., N.J.
Lewis, F., 1986a, Optimal Control, John Wiley & Sons
Lewis, F., 1986b, Optimal Estimation, John Wiley & Sons
Nagiri, S., Doi, S., Shohno, S. and Hiraiwa, N., 1992, 'Improvement of Ride comfort by Preview Vehicle-Suspension System,' SAE Automotive Suspensions and Steering Systems, SP-917, pp. 81-87
Sharke, P., 2001, 'Let light be there,' ASME Mechnical Engineering, Vol. 123, No. 6, pp. 70-73
Tomizuka, M., 1976, 'Optimum Linear Preview Control with Applications to Vehicle Suspensions,' ASME Journal of Dynamic Systems, Measurement, and Control, pp. 309-315
Yong, B., 1997, 'Contour-Following of a Force-Controlled Industrial Robot Using Preview Control,' KSME International Journal, Vol. 11, No. 2, pp. 115-124

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