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Nonlinear Model-based Control of Vane Type Continuous Variable Valve Timing System
선우명호,이광윤,손명현,이민광,이승우,이춘우,김우태 한국자동차공학회 2007 International journal of automotive technology Vol.8 No.5
The Variable Valve Timing (VVT) system for high performance is a key technology used in newly developed engines. The system realizes higher torque, better fuel economy, and lower emissions by allowing an additional degree of freedom in valve timing during engine operation. In this study, a model-based control method is proposed to enable a fast and precise VVT control system that is robust with respect to manufacturing tolerances and aging. The VVT system is modeled by a third-order nonlinear state equation intended to account for nonlinearities of the system. Based on the model, a controller is designed for position control of the VVT system. The sliding mode theory is applied to controller design to overcome model uncertainties and unknown disturbances. The experimental results suggest that the proposed sliding mode controller is capable of improving tracking performance. In addition, the sliding mode controller is robust to battery voltage disturbance.
선우명호(Myoungho Sunwoo),송정훈(Jeonghoon Song),최정환(Junghwan Choi),한만배(Manbae Han) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
With the advent of stringent emission regulations, the optimum control of combustion has become a crucial factor in developing vehicles. By using cylinder pressure sensors the combustion process can be analyzed in a direct manner, offering a more efficient method of controlling combustion and emissions. A basic understanding of combustion characteristics and its effect on the cylinder pressure is developed. For a feasibility study, a test bench is setup using pressure sensors, a data acquisition board. an encoder, a personal computer, and other related circuits and systems. A software algorithm for control purposes is also developed and is named P- View.<br/>
수동변속 차량의 변속 패턴 분석을 위한 장치의 개발(Ⅰ)
선우명호(M.Sunwoo),이재인(J.Lee),이우택(W.Lee),차호석(H.Cha),정규봉(K.Jung),지호석(H.Ji),이기성(K.Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
This is a study on a test system newly developed for analyzing the shift pattern of a manual transmission vehicle. This system which is called a Computer Aided Shift-survey System(CASS) can be used to develop a representative shift pattern for the EPA fuel economy test as well as for the catalytic converter durability test.<br/> The CASS mainly consists of a microcontroller(68HCll) and a notebook computer. It monitors gear position and vehicle speed by optical sensors. Whenever a driver shifts a gear, the CASS analyzes the shift pattern in real-time. The real-time processing test version is completed and shows satisfactory performances, and the final version which can perform post-processing as welt as real-time processing is being developed.<br/>