• 전기학회논문지
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• 제57권12호
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• pp.2202-2207
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• 2008

Bearingless SRM(Switched Reluctance Motor) is researched for high speed or special applications which can not use mechanical bearing such as bio pump. In this paper, a novel hybrid pole bearingless SRM is presented. The proposed hybrid pole bearingless SRM has salient poles for torque and suspending force production. Motor torque is controlled by the phase currents in torque pole windings, and the suspending force is controlled by suspending currents in four suspending windings for radial direction suspension. Because the proposed bearingless SRM has divided pole structure, mutual effects between torque current and suspending current are very lower than the conventional one's. From this structure, the number of power devices for power converter can be reduced for bearingless SRM driving. The proposed hybrid pole bearing less SRM is verified by the FEM analysis and experimental results.

• 방송공학회논문지
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• 제21권5호
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• pp.760-769
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• 2016

본 논문에서는 LED의 색 영역을 확장하기 위해서 Hybrid LED 구동회로와 제어 기법을 제안하였다. 제안된 Hybrid LED 구동회로는 고 전류에서는 스위칭 레귤레이션 동작을 하고 저 전류에서는 리니어 레귤레이션 동작을 함으로써 LED에 일정한 정 전류를 공급하였다. 또한 고 전류와 저 전류의 크기를 각각 CC 제어기법과 PWM 제어기법으로 제어하였다. 제안된 구동회로와 제어 기법으로 RGB LED 각각의 전류를 가변하였고, 전류가 최대 전류대비 2%까지 선형적으로 제어됨 실험을 통해 확인하였다. 게다가 출력된 광색을 CIE1931 색도좌표로 측정하였다. 그 결과 기존의 표현할 수 없었던 색이 균일하게 출력됨을 확인하였으며, 제안된 구동회로와 제어 기법이 저 전류제어가 가능함으로 색 영역 확장이 가능함을 증명하였다.

• 한국전자통신학회논문지
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• 제18권6호
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• pp.1307-1312
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• 2023

본 논문에서는 자율주행 인지 기술의 핵심 요소인 객체 인식과 거리 측정을 위해 서로 다른 초점거리를 가진 다시점 카메라와 라이다(LiDAR) 센서를 결합한 복합형 카메라 시스템을 제안한다. 제안한 복합형 카메라 시스템을 이용해 장면 안의 객체를 추출하고, 추출한 객체의 정확한 위치와 거리 정보를 생성한다. 빠른 계산 속도와 높은 정확도, 실시간 처리가 가능하다는 장점 때문에 자율주행 분야에서 많이 사용하고 있는 YOLO7 알고리즘을 이용해 장면 안의 객체를 추출한다. 그리고 객체의 위치와 거리 정보를 생성하기 위해 다시점 카메라를 이용해 깊이맵을 생성한다. 마지막으로 거리 정확도를 향상시키기 위해 라이다 센서에서 획득한 3차원 거리 정보와 생성한 깊이맵을 하나로 결합한다. 본 논문에서는 제안한 복합형 카메라 시스템을 기반으로 주행중인 주변 환경을 더욱 정확하게 인식함과 동시에 3차원 공간상의 정확한 위치와 거리 정보까지 생성할 수 있는 자율주행 차량 플랫폼을 제안하였으며, 이를 통해 자율주행 차량의 안전성과 효율성을 향상시킬 수 있을 것으로 기대한다.

• 한국생산제조학회지
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• 제22권3호
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• pp.364-371
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• 2013

Because of the increases in international oil prices and the level of global warming, the automotive industry has much interest in developing green cars with high fuel efficiencies. In addition, researchers in Korea are actively responding to high oil prices and $CO_2$ emission regulations in many ways. One example is, the multi-mode hybrid system, which is being studied to improve its performance. Because a multi-mode hybrid system is able to overcome the weaknesses of a system that uses simple planetary gears, excellent fuel efficiency and driving performances are the key features of the system. This paper analyzes the driving performance of the power-train system of GM-2MT70, which consists of one engine, two electric motors, one simple planetary gear, one double planetary gear, two clutches, and two brakes. The driving performance of the system's steady state is analyzed using performance modeling. The dynamic performance is analyzed using Matlab Simulink.

• 한국자동차공학회논문집
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• 제22권7호
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• pp.117-126
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• 2014

Recently, due to various environmental problems such as global warming, increasing of international oil prices and exhaustion of resource, a paradigm of world automobile market is rapidly changing from vehicles using internal combustion engine to eco-friendly vehicles using electric power such as EV (Electric Vehicle), HEV (Hybrid Electric Vehicle), PHEV (Plug-in Hybrid electric Vehicle) and FCEV (Fuel Cell Electric Vehicle). There are many driving cycles for performance evaluation of conventional vehicles. However there is a lack of researches on driving cycle for EV. This study is composed of part 1 and part 2. In this paper part 1, in order to develop urban driving cycle for performance evaluation of electric vehicles, Gwacheon-city patrol route of police patrol car was selected. Actual driving test was performed using EV. The driving data such as velocity, time, GPS information etc. were recorded. GUDC-EV (Gwacheon-city Urban Driving Cycle for Electric Vehicles) including road gradient was developed through the results of analyzing recorded data. Reliability of the driving cycle development method was substantiated through comparison of electricity performance. In the second part of this study, the developed driving cycle was compared to simulation result of the existing urban driving cycle. Verification of the developed driving cycle for EV performance evaluation was described.

• International Journal of Automotive Technology
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• 제4권1호
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• pp.41-45
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• 2003

The 42V Mild Hybrid System has been released into market by Toyota for the first time in the world in 2001. The set-up employs an inverter unit to control the motor/generator (MG) electronically. The driving system called such as Toyota Mild Hybrid System (TMHS) has additional new functions to conventional internal combustion engines. When stopping vehicle, the engine stops promptly. When starting vehicle, by releasing the brake pedal MG starts the vehicle at the same time (EV-driving mode). When stepping on the accelerator pedal, or after a given period of time the engine firing occurs and the engine-driving mode starts. When running by motor, the power is supplied to the motor from 36V battery through the inverter. High outputs and instant responses are required for Inverter. At the same time, the compact volume is required to fit into the limited space of the engine room. The compact size and high output are also required to Power Capacitor used for this inverter. The power capacitors has been newly developed, shaped in "flat" type, suitably for the inverter. The points of developments on inverter and power capacitor are described in this paper.his paper.

• 로봇학회논문지
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• 제5권3호
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• pp.270-277
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• 2010

Various robot platforms have been designed and developed to perform given tasks in a hazardous environment for the purpose of surveillance, reconnaissance, search and rescue, and etc. We have considered a terrain adaptive hybrid robot platform which is equipped with rapid navigation on flat floors and good performance on overcoming stairs or obstacles. Since our special consideration is posed to its flexibility for real application, we devised a design of a transformable robot structure which consists of an ordinary wheeled structure to navigate fast on flat floor and a variable tracked structure to climb stairs effectively. Especially, track arms installed in front side, rear side, and mid side are used for navigation mode transition between flatland navigation and stairs climbing. The mode transition is determined and implemented by adaptive driving mode control of mobile robot. The wheel and track hybrid mobile platform apparatus applied off-road driving mechanism for various professional service robots is verified through experiments for navigation performance in real and test-bed environment.

• 한국산학기술학회논문지
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• 제12권4호
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• pp.1575-1580
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• 2011

Toyota사의 PRIUS THS 시스템을 이용하여 HEV 알고리즘 분석을 통한 THS의 주행 모드 변환에 따른 실시간 모니터링 시스템을 개발하고자 한다. 병렬형 하이브리드 시스템의 경우에 엔진과 전동기를 주행 상태 최적인 상태로 운행하기 위해서는 다양한 제어전략이 필요하다. 본 연구를 통하여 주행 가능한 THS 차량의 주행에 필요한 입 출력 정보를 실시간적으로 모니터링할 수 있는 시스템을 개발한 결과, 하이브리드 자동차의 동력 분할 및 에너지 활용을 극대화시키기 위한 수단의 하나로 차량의 주행모드 변화에 따른 각 구성요소의 동작 상태를 모니터링 가능하게 되었다. 개발된 시스템은 제어전략의 체계적인 수립과 실시간 데이터 분석이 가능하기 때문에 HEV자동차의 알고리즘 분석해석을 통해 HEV자동차의 개발 기반에 유용하게 활용될 것이다.

• 한국자동차공학회논문집
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• 제7권9호
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• pp.75-81
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• 1999

In this paper, the details of electronically controlled CVT is described , which Kia Motor company recently developed in prototype form for hybrid passenger car. This transmission has two input shafts, one for engine and the other for traction motor. The shaft for traction motor is located at rear side which is extended from primary pulley shaft and connected to traction motor through adapter gear box. Adopting two input system, various driving mode is available such as motor alone driving in hybrid vehicle application. As far as electrohydraulic system concerned , this transmission uses two bleed type variable force solenoids for line pressure and ratio control, and one on-off solenoid for clutch control. Another feature for this transmission is that oil pump for transmission is separate from CVT for supplying oil pressure even at vehicle standstill.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.910-914
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• 2005

In this paper an optimal method based on fuzzy logic for controlling parallel hybrid electric vehicles is presented. In parallel hybrid electric vehicles the required torque for deriving and operating the on-board accessories is generated by a combination of internal-combustion engine and an electric motor. The powersharing between the internal combustion engine and the electric motor is the key point for efficient driving. This is a highly nonlinear and time varying plant and its control strategy will be implemented with the use of fuzzy logic controller. The fuzzy logic controller will be designed based on the state of charge of batteries and the desired torque for driving. The output of controller controls the throttle of the combustion engine. The main contribution of this paper is the development of an optimal control based on fuzzy logic, which maximizes the output torque of the vehicle while minimizing fuel consumed by the combustion engine.