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문병준(ByoungJoon Moon),박용제(YongJe Park),김동신(DongShin Kim),박종국(ChongKug Park) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The EPB system is actually designed to get the braking force by the electric motor through a driver's simple switch operation, not the existing system that conventional parking brake gets braking force through a driver's power. The EPB system is composed of ECU, PWM(Pulse Width Modulation) driver, DC motor and actuator. The ECU decides a brake's apply/release according to a driver's input and controls command to generate desired braking force. The force sensor value plays the most important role in supplying enough braking force to EPB system. If the force sensor is in a fault, it can give vehicle safety a serious danger since enough braking force is not supplied. Therefore, it is necessary to develop a model based fault detection method with high reliability to detect an abnormal signal fault. It can't detect by the existing on-line sensor monitoring method.
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온도변화에 강인한 EPB 시스템의 모델기반 고장검출 방법
문병준(ByoungJoon Moon),박종국(ChongKug Park) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.5
In this paper, a robust model based fault detection for varying temperature is proposed. To develop a robust force estimation model, it needs temperature information because the force sensor's output is affected by a temperature variation. If an EPB system does not include a temperature sensor, the model has a much larger error than an EPB system with a built-in temperature sensor. Therefore, the temperature is estimated by using Ohm's law. The force model is applied with a motor current, battery voltage, operation mode, and the estimated temperature to detect a force sensor's abnormal signal fault. The residual is calculated by comparing the value of the measured force and the estimated force. Fault information is collected by using the output of the evaluated residual with the adaptive thresholds. A proposed robust model based fault detection for varying temperature was verified by HILS (Hardware in the Loop Simulation).
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모바일 디지털카메라 모듈에 대한 개선된 AE 알고리즘 구현
조선호(Sunho Cho),김동한(Donghan Kim),박종국(Chongkug Park) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.5
In this paper, an improved AE system for digital still camera is proposed. AE system is auto exposure system to maintain optimized brightness of output image. But there is limitation for mobile devices to get high quality image with the conventional AE algorithm, because of organizational restriction of system. The conventional research has been studied only electronic shutter and AGC on the AE algorithm. In this paper, we suggest new AE algorithm included target setting, frame delay, Gamma Correction as well as electronic shutter and AGC to get high quality image. The proposed algorithm show improved result at control speed and ability of luminance expression.
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