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권세일(S.I.Kwon),장광수(K.S.Chang) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
The objective of this paper is to study on idle speed control using the fuzzy logic and PI control. The mathematical engine model was obtained using the AR model, which estimates parameters using the engine rpm per ISC motor step and random error signal. The inputs of fuzzy controller are error of rpm and rpm variation. The output of fuzzy controller is ISC motor step. The airflow is controlled by the ISC motor movement and idle speed is controlled by the airflow control. In conclusion, stable idle speed response was realized using the fuzzy and PI controller via by experiments.<br/>
FFT를 이용한 노킹판단 기준값의 자동수정 알고리즘 개발
강성현(S.H.Kang),장광수(K.S.Chang),서정인(J.I.Seo),전광민(K.M.Chun) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
The purpose of knocking control is to avoid knock occurrence while minimizing fuel efficiency loss and engine torque loss. The actual knock control is performed by retarding and advancing spark timing near maximum brake torque or knock limit based on knock measurements exceeding the knock threshold value predetermined appropriately. However the threshold value should not be constant throughout the engine life due to the engine aging and characteristics distinction.<br/> In this paper, a new knocking control algorithm was developed using the knock threshold value auto-correction algorithm. This algorithm uses the Fast Fourier Transform (FFT) method by measuring cylinder block vibration signals of a 1498 cc four-cylinder spark ignition engine. The experimental results show the proposed knock control algorithm provides improved performance compared to the existing method. The results also show that the proposed FFT algorithm provides real-time adjustment of the knock threshold value.<br/>
차량 간격 자동제어장치를 위한 퍼지적응제어 알고리즘 개발
최재성(J.S.Choi),장광수(K.S.Chang) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
In Advanced Vehicle Control System(AVCS), Autonomous Intelligent Cruise Control(AICC) is generally understood to be a system that can be achieved in the near future without the demanding infra-structure components and technologies. AICC is an automatic vehicle following system with no human engagement in the longitudinal vehicle direction. This paper presents a fuzzy control algorithm to develop AICC system, examine the control performance in formation of vehicles using computer simulations. The most important aspect of the work reported here is the adoption of the fuzzy adaptive control law, and the use of filtering concept to reduce the slinky-effects that may appear in a formation of vehicles equipped with AICC systems. The simulation results demonstrate the effectiveness of the fuzzy adaptive AICC system and its beneficial effects on traffic flow<br/>
임철훈(C.H.Im),장광수(K.S.chang),김영원(Y.W.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
This paper presents dynamic modeling and its validation regarding automotive brake system.Using the model. the dynamic characteristics was studied for the interacton between brake system components when the brake is applied and released. The model includes a brake pedal, vacuum booster, master cylinder, proportioning valve which shows the relationship between the line pressure and the brake torque applied to the wheel. In order to validater the dynamic model, the whole system was divided into individual component of which scope appropriate to be programmed using Object-Oriented Programming Method in the MATLAB SIMULINK. This modular approach was adopted to utilize the simulation tool in various field such as AICC and vehicle platooning,etc. Finally the simulation results are compared with experimental results which shows good correspondence between the developed brake model and actual brake system.<br/>
디지탈 신호 처리 기술을 이용한 노킹 판단 기준값의 자동 수정 알고리즘 개발
이재형(J.H.Lee),장광수(K.S.Chang),함윤영(Y.Y.Ham),전광민(K.M.Chun) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
In this study, the automatic correction algorithm for threshold value, which is very important for<br/> KCS(Knock Control Sytem), has been developed on the basis of the Digital Signal Processing technique. The Non-dimensional Total Cross Power Spectrum(NTCPS) value between vibration signal peak values and its median filtered signal was used as a tool for monitoring knock condition. This NTCPS value was employed to obtain appropriate knock threshold value.<br/>
적응 슬라이딩 모드 제어를 이용한 차량 간격 제어기 설계에 관한 연구
백창현(C.H.Paik),장광수(K.S.Chang),원문철(M.C.Won) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
An adaptive sliding mode controller with loads estimation is designed for AICC. The developed discrete time adaptation law differs from that of conventional sliding mode control. And aims at adaptation on a large disturbance or unmodeled dynamics. The closed loop stability is checked in the discrete time domain. And the exponential decay of the adaptation error can be guaranteed by a proper placement of the discrete time closed loop poles. The results of numerical simulation show better adaptation and tracking performance over the conventional adaptation scheme. The new adaptive scheme is shown to be especially effective under rapid changes of commanded speed.<br/>
Normal Metal에서 전자와 Phonon의 상호작용
張光秀,金成奎 嶺南大學校附設 基礎科學硏究所 1982 基礎科學硏究 Vol.2 No.-
In the paper we develop Green's function which enables one to consider the interaction between electrons and phonon without assuming that the interaction is small. The state which contains the 'condensate' of bound electrons can not be obtained from the ground state of noninteracting particles by applying the interaction adiabatically. We took below for normal metal, where this difficulty does not occur.