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Meng Di Yin(인멍디),Jiae Youn(윤지애),Daejin Park(박대진),Jeonghun Cho(조정훈) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
Pulse-based charging method for battery cells has been recognized as a fast and efficient way to overcome the shortcoming of slow charging time in distributed battery cells. The pulse frequency for controlling the battery charge will change within a certain range. The optimal frequency is determined to achieve the minimized battery impedance. The adaptation of a duty cycle of the pulse by decreasing the concentrated polarization guarantees a safe charging operation of all the distributed cells within a temperature range of 5℃ to 45℃. The proposed charging process can be completed to about 80% of its maximum capacity in less than 20 minutes without damaging the battery characteristics. The newly designed charging results show that about two times faster than the conventional constant-current constant-voltage (CC-CV) charging method and 52% more efficient than the constant current fast charging method.
기능 안전성을 위한 대칭형 각도센서 보상기에 기반한 안전한 적응형 전조등 제어기의 설계
윤지애,인멍디,안중현,조정훈,박대진,Youn, Jiae,Yin, Meng Di,An, Junghyun,Cho, Jeonghun,Park, Daejin 대한임베디드공학회 2015 대한임베디드공학회논문지 Vol.10 No.5
AFLS (Adaptive front lighting System) is being applied to improve safety in driving automotive at night. Safe embedded system for controlling head-lamp has to be tightly designed by considering safety requirement of hardware-dependent software, which is embedded in automotive ECU(Electronic Control Unit) hardware under severe environmental noise. In this paper, we propose an adaptive headlight controller with newly-designed symmetric angle sensor compensator, which is integrated with ECU-based adaptive front light system. The proposed system, on which additional backup hardware and emergency control algorithm are integrated, effectively detects abnormal situation and restore safe status of controlling the light-angle in AFLS operations by comparing result in symmetric angle sensor. The controlled angle value is traced into internal memory in runtime and will be continuously compared with the pre-defined lookup table (LUT) with symmetric angle value, which is used in normal operation. The watch-dog concept, which is based on using angle sensor and control-value tracer, enables quick response to restore safe light-controlling state by performing the backup sequence in emergency situation.
기능 안전성을 고려한 대칭형 각도 센서 보상기에 기반한 적응형 전조등 제어기의 설계
윤지애(Jiae Youn),인멍디(Meng Di Yin),박대진(Daejin Park),조정훈(Jeonghun Cho) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
Steering angle based adaptive headlighting controller for safe operation in emergency situation is proposed by adopting the compensation method of the symmetric two angle sensor data. Adding the intelligence in automotive applications results in more chance of the unsafe operations, requiring the integration of additional safety functions. In this paper, we introduce our efforts to integrate the safety observer with the adaptive headlight controller, still providing safe angle control in an abnormal situation by the steering angle, if the symmetric behavior of two angles is broken in the unknown interruption, the backup angles are restored into the active angle control value.