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Development of PMP-based Power Management Strategy for a Parallel Hybrid Electric Bus
정종렬,차석원,Daeheung Lee,김남욱,Chunhua Zheng,박영일 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.15 No.2
To operate a hybrid electric vehicle efficiently, it is important how to manage energy components such as the engine, motor and battery of the vehicle. In this paper, the Pontryagin's minimum principle (PMP) based power management strategy is developed and applied to a forward simulation program able to calculate the fuel economy of a vehicle with its specified driving cycle. Typical two other power management strategies, the Max state of charge (SOC) power management strategy and the power split ratio rule-based power management strategy are also developed and applied to verify the application possibility of the PMP-based power management strategy. A simulated comparison of the power management strategies using six driving cycles is conducted. As a result, considering the characteristics of buses which drive a routine cycle repeatedly, the PMP-based power management strategy, which shows the most efficient performance with respect to the fuel economy and the maintenance of the battery SOC, is more appropriate than the other power management strategies while the application of PMP-based power management strategy to a conventional vehicle has a difficulty because of the problem about maintenance of the battery SOC.
정종렬,김남욱,임원식,박영일,차석원,장명언 한국자동차공학회 2017 International journal of automotive technology Vol.18 No.5
In a hybrid electric vehicle (HEV) system, it is an important issue on how to distribute the output power from multiple power generating components to operate a vehicle more efficiently. Many studies have been conducted on how to manage multiple power sources of a vehicle based on various optimization theories. In this study, an algorithm to calculate the optimization of a series HEV that has three power generating components, engine, battery and ultra-capacitor, is developed based on dynamic programming. Normally dynamic programming is applied to the optimization of power management and components sizing by estimating potential fuel economy for electrified vehicle such as HEV, Plug-in HEV or Fuelcell HEV. In contrast with most objective systems that have only two power generating components, the system in this study has three power sources. Since the system has three power sources, the number of state and control variables of optimization problem increases. Therefore the number of calculations increases unreasonably. To decrease the number and time of calculations, a new electric model that contains the both characteristics of battery and ultra-capacitor is developed with some assumptions. In comparison with the optimization algorithm which follows the theory of DP with no assumptions, the results from the newly developed algorithm has 1.04 % discrepancy in terms of fuel economy, even though the calculation time decreases to 4400 times less.
정종렬,문두열,서동주,이성수,김명수 東義大學校産業技術開發硏究所 2011 産業技術硏究誌 Vol.25 No.-
본 연구에서는 RMSE 분석 결과 반사각도 90°의 재료별로 0.2mm~0.4mm까지의 RMSE가 분석되었으며, 90°의 반사각도에서는 무 프리즘 토털스테이션의 정확도는 재료와 상관없이 매우 양호한 값으로 분석되었다. 다음은 반사각도 60°에서는 재료별로 0.6mm~0.7mm까지의 RMSE가 분석되었으며, 60°의 반사각도에서는 토사의 경우만 높은 정확도가 나타났으며, 다른 재료는 비교적 오차가 많은 것으로 나타났다. 특히 아스팔트는 RMSE가 낮게 나타났는데 그것은 관측거리가 120m밖에 되지 않은 이유로 판단된다. 그리고 반사각도 30°에서는 재료별로 0.9mm~1.5mm까지의 RMSE가 분석되었으며, 30°의 반사각도에서는 아스팔트인 경우는 반사각도60°와 같은 이유이며, 다른 재료는 비교적 오차가 많은 것으로 나타났다. 특히 목재인 경우는 1.5 mm이므로 지형측량시 반사각도 30°일때 오차가 많이 발생할 것으로 판단된다. In this study, reflected angle 90° of RMSE results for each material was analyzed by RMSE between 0.2mm~0.4mm. And a reflected angle 90° to accuracy of non-prism Total Station was analyzed that very good value regardless materials. And a reflected angle 60° was analyzed by 0.6mm~0.7mm of RMSE for each material. And a reflected angle 60° showed high accuracy only in the soil, other materials showed relatively more errors than the soil. Especially Asphalt showed lower REMS than other materials because Especially Asphalt showed lower REMS than other materials it is only 120m distance. it is only 120m distance. And a reflected angle 30° was analyzed by 0.9mm~1.5mm of RMSE for each material. Then a reflected angle 30° in Asphalt is same reason with a reflected angle 60° so REMS was low. Also other materials have relatively high errors. The Topography surveying when a reflected angle 30° used cause a lot of errers are expected.
타이어 슬립 모델을 고려한 4륜 구동 하이브리드 전기 차량의 동적 최적화 기반 후뱡향 시뮬레이션 프로그램 개발
정종렬(Jongryeol Jeong),김형균(Hyungkyoon Kim),임원식(Wonsik Lim),차석원(Suk Won Cha),강상욱(Sangwook Kang) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Inline system 4WD hybrid electric vehicle is driven by engine and motor which are connected different tire axis independently. Front wheel of the vehicle is driven only by the engine which is exactly the same with conventional vehicle. On the other hand rear wheel of the vehicle is driven by the motor so that the vehicle can be driven in electric vehicle mode, hybrid electric vehicle mode, engine only mode and regenerative braking mode as similar as the typical parallel hybrid electric vehicle. In this paper, a backward simulation program applied by dynamic programming which has tire slip model based on the vehicle dynamics was developed to express the characteristics of 4WD hybrid electric vehicles. It is possible to calculate the optimal fuel economy and other various status of the vehicle when the vehicle follows the given driving cycle. It is considered that optimization of the vehicle components and development of control logic for the vehicle are possible to utilize the backward simulation program.
최적화 기법을 이용한 상용 하이브리드 차량의 최적 배터리 용량 선정에 관한 연구
정종렬(Jongryeol Jeong),이대흥(Daeheung Lee),신창우(Changwoo Shin),임원식(Wonsik Lim),박영일(Yeongil Park),차석원(Sukwon Cha) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
These days, many restrictions about the vehicle emission gases especially CO2 are increasing because of global warming. Simultaneously studies about hybrid electric vehicle (HEV) are increasing. In this situation, hybridization for heavyduty system vehicle such as bus or truck can be a realistic solution. Heavy-duty vehicles’ driving cycle is more predictable than the other vehicles. It is easier developing control strategies for Heavy-duty vehicles than the others. As making a hybrid system, size of battery is important factor because of its expensive cost. In this paper, battery sizing of a heavy-duty system will be suggested using optimal control method. By using this method, it will be possible to choose safe and effective size of battery.
차량 안정성 및 선회 성능을 고려한 휠 모터 구동 버스 시스템 제어 알고리즘 개발
정종렬(Jongryeol Jeong),최종대(Jongdae Choi),신창우(Chang Woo Shin),임원식(Wonsik Lim),차석원(Suk Won Cha) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Recently, many academies and vehicle companies have researched electric vehicle able to be a solution of global warming and increasing of oil price. Wheel motor drive system which do not utilizes complex transmission or differential gear is an effective vehicle system of various kinds of electric vehicle system. In wheel motor drive system, appropriate power distribution of traction motors should be conducted for the performance of cornering and safety of the vehicle. In this paper, a control algorithm based on PID control theory was developed for the traction of the vehicle. With the developed control algorithm, forward simulations were conducted using six degrees of freedom vehicle dynamics simulation program. From the simulation results, it was verified of safety and cornering performance of the vehicle. For the actual application of the control algorithm, further research, such as combining with regenerative braking algorithm or vehicle speed estimation algorithm, is on the plan.
분산체제에서의 데이타 전송을 위한 보안 알고리즘의 설계 및 구현
정종렬(Jung Jong-Youl),김영근(Kim Yeoung-Kun),박규석(Park Kyoo-Seok) 한국정보과학회 1993 한국정보과학회 학술발표논문집 Vol.20 No.2
분산 체제에서의 정보 전송을 위한 암호화 알고리즘을 제안하였다. 입력 데이타와 랜덤 넘버를 이용하여 key를 생성하였으며, key가 생성된 후 바로 암호화하여 전송하며, 병행적으로 암호문을 생성하여 전송한다. 또한, 일정한 암호문 생성시마다 새로운 key를 생성하도록 하였다. 따라서, key의 분석이 어렵고, 암호화의 강도를 높이면서 오버헤드를 줄이는 특성을 갖는다.
전자 제어식 주차브레이크(EPB)의 모델링 및 실험을 통한 검증
정종렬(Jongryeol Jeong),신창우(Changwoo Shin),이대흥(Daeheung Lee),임원식(Wonsik Lim),차석원(Sukwon Cha) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Electric Parking Brake(EPB) is the parking system which is operated by electric control actuator. It differs from the mechanical parking brake system which is operated by lever/pedal in need of human power. The EPB system is composed of DC motor, helical/differential epicyclic gear, screw, cables, and sensor. This paper describes about the EPB system mathematically and constructs a modeling of the EPB system using MATLAB/SIMULINK. Especially, SimMechanics library in SIMULINK is used to make each parts of system a module. By making modeling of the friction torque between bolt and nut, Cable tension can be maintained after the motor operating stops.