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듀얼 모드 하이브리드 시스템 기반의 플러그인 하이브리드 굴삭기 모델링 및 성능해석
이상민(Sangmin Lee),이지호(Jeeho Lee),이상훈(Sang Hoon Lee),이형철(Hyeongcheol Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
A Plug-In Hybrid Excavator is composed of an electric motor to drive a hydraulic pump, a battery to generate electrical energy and an auxiliary engine/generator to charge a battery. It is designed to work by consuming the electrical energy of a battery. In this system, when the battery SOC drops below a certain range, a auxiliary engine/generator charges the battery. In the case of Series Hybrid system, there is a disadvantage that the energy conversion loss is relatively large. To overcome the disadvantage, the power distribution mechanism by using the Dual-Mode Hybrid system is proposed in this paper. The Dual-Mode Hybrid system operates in two modes: input split mode and compound split mode. The former has an advantage in a low workload range while the latter has an advantage in a high workload range. In this paper, the Series Hybrid system and the Dual-Mode Hybrid system are modeled and the simulation is conducted to verify the feasibility of the power distribution mechanism. The simulation results show that the performance by the Dual-Mode Hybrid system is improved compared with a series type plug-in hybrid excavator.
확장형 칼만 필터를 활용한 자율주행 전기차의 통합 고장 진단 알고리즘
이현창(Hyunchang Lee),이주인(Jooin Lee),이형철(Hyeongcheol Lee) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
It is important to obtain an accurate sensor value because an autonomous vehicle controls by processing various information through a sensor. If a sensor value problem occurs due to a sensor failure, it can cause a serious performance degradation problem. To prevent this deterioration problem, sensor failures are diagnosed and model-based fault detection and diagnosis algorithms are utilized as a method. In previous studies, a generalized observer method using extended kalman filter(EKF) was used as a model-based fault diagnosis method, but the computational amount increased as the number of diagnostic subjects increased. In this paper, a new method for the reduction number of extended kalman filter(EKF) was investigated. The proposed method designs the extended kalman filter(EKF) by integrating the lower system dynamics of the vehicle with vehicle dynamics.
수소연료전지 버스의 비선형 모델 예측 제어를 활용한 실시간 동력 분배 제어 알고리즘
이승연(Seungyeon Lee),이주인(Jooin Lee),임종원(Jongwon Lim),이형철(Hyeongcheol Lee) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
In this paper, power distribution control algorithm for fuel cell electric bus was developed. Power distribution control algorithm is developed by using Gradient based Model Predictive Control(GRAMPC). Algorithm considered vehicle’s system characteristics like fuel cell, battery, motor and vehicle dynamics. Cost function is developed with considering battery’s State-of-charge and consumption ratio of fuel cell. GRAMPC can execute nonlinear model predictive control algorithm with real-time environment. Driving scenario is developed including real world traffic condition by using SUMO and Autonomie. Algorithms is validated in real-time simulation environment with dSPACE RCP-HIL simulator.
굴삭기 전기동력시스템의 동작점 제어 알고리즘에 관한 연구
이지혜(Jihye Lee),이지호(Jeeho Lee),오창은(Chang Eun Oh),이형철(Hyeongcheol Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This paper presents an optimal operation point control algorithm for a hydraulic pump and an electric motor in an electric excavator system. The system consists of a hydraulic pump and a motor: the one delivers the power to hydraulic actuators and the other conveys the power to the hydraulic pump. The system requires an operating point control with efficiency maps of the motor and the hydraulic pump respectively because the efficiency feature of the system is different from that of conventional diesel engine excavator. In this paper, an integrated efficiency map is derived from each efficiency map of the motor and the hydraulic pump. Operation points are produced where the integrated efficiency is the maximum under the same power and the same pressure condition. An optimal operating point control algorithm of the electric-hydraulic system is proposed and simulations are performed through the MILS (Model-In-the-Loop Simulator). The efficiency of this system is improved compared with that of the uncontrolled electric-hydraulic system.
전기굴삭기 에너지 효율 향상을 위한 유압펌프 - 전동기 통합 제어 알고리즘
이지호(Jeeho Lee),이지혜(Jihye Lee),이형철(Hyeongcheol Lee),오창은(Chang Eun Oh) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.2
전기굴삭기는 배터리에 저장된 에너지로 전동기-유압펌프를 구동해서 유압 에너지를 생성하고 이를 작업에 활용한다. 기존 유압굴삭기의 유압펌프는 디젤 엔진의 운전 효율에 최적화된 레귤레이터에 의해 제어되고, 유압펌프 자체의 효율은 고려되지 않았다. 전기굴삭기는 배터리를 에너지원으로 사용하기 때문에 전동기의 효율뿐 아니라 유압펌프의 효율을 함께 고려한 제어가 요구된다. 통합 제어를 위해서 유압펌프와 전동기의 출력과 효율 특성을 분석하여 효율맵을 작성하였고, 이를 바탕으로 최적동작맵을 구성하고 통합 제어 알고리즘을 개발했다. 알고리즘의 효과를 확인하기 위해 전기굴삭기 MILS 를 구성해서 통합 제어 알고리즘을 적용했다. 굴삭기 작업 시뮬레이션 결과는 통합 제어 알고리즘이 시스템 효율을 향상 시켰음을 보여준다. An electric excavator consumes battery energy to drive an electric motor attached to a hydraulic pump to generate hydraulic power. In a conventional hydraulic excavator, the hydraulic pump is controlled by regulators, which are used to optimize the diesel engine efficiency. Because of a lack of battery energy capacity, an electric excavator controller should consider not only the electric motor efficiency but also the hydraulic pump efficiency. Thus, electric motor and hydraulic pump efficiency maps were constructed. An optimal operating map (OOM) was created based on the most efficient operating points under each input condition. An integrated control algorithm controlled the speed of the electric motor and displacement of the hydraulic pump according to the OOM. To confirm the utility of this algorithm, a model-in-the-loop simulator for the algorithm with an electric excavator was established. The simulation results showed that the integrated control algorithm improved the energy efficiency of an electric excavator.
종방향 차량모델을 이용한 하이브리드 휠로더의 연비 개선효과에 관한 연구
이성화(Sunghwa Lee),박태호(Taeho Park),진기창(Kichang Jin),이형철(Hyeongcheol Lee),권영민(YoungMin Kwon),이종찬(Jongchan Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This paper proposes the configuration of parallel hybrid wheel loader and power control algorithm. The target vehicle is composed of engine, battery, motor, torque converter, transmission, vhehicle, and wheel. The main control strategy of the target vehicle is to optimally distribute demanded power from the power sources by considering highest efficiency point of the engine and motor. Furthermore, when there is no engine load, the idle stop technology is applied. A hybrid wheel loader model and the proposed algorithm are developed by unsin AMEsim, verified through the simulation, and compared with the results of conventional wheel loader. Simulation results show fuel reduction and narrow swing of SOC, and thus demonstrate the feasibility and effectiveness of the proposed algorithm.
전기굴삭기 효율향상을 위한 전기동력시스템 동작점 제어알고리즘 연구
이지호(Jeeho Lee),이형철(Hyeongcheol Lee),염준형(Joonhyung Yeom),이상훈(Sanghoon Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The working time of electric excavator needs to be extended by improving efficiency of the electric power system. In this paper, the characteristics and efficiency maps of tandem pump-electric motor system is analyzed and the control algorithm which optimize the displacements of the tandem pump is established. To confirm the utility of this algorithm, the model-in-the-loop simulator of electric excavator for the algorithm is established. The simulation results shows that the control algorithm improved the energy efficiency of the electric excavator.
이지호(Jeeho Lee),이형철(Hyeongcheol Lee),곽재호(Jaeho Kwak) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Railway vehicle engineers are studying high efficient traction systems to reduce CO2 gases. A vehicle with On-board is one of remarkable methode to improve high efficient railway system. In this paper, railway vehicles, battery/catenary models were built and power distribution-algorithm which is electric power distribution rules between battery and catenary was developed and simulated. If characteristics of battery and catenary are reflected in the power distribution algo vehicle’s running efficiency will increases remarkably.
하이브리드 에너지 저장장치 탑재 전동차의 전력 분배 방안 연구
이지호(Jeeho Lee),이형철(Hyeongcheol Lee),오용국,Jaeho Kwak 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Railway vehicle engineers are studying high efficient traction systems to reduce CO2 gases. Equipping energy storage systems on Vehicles are one of remarkable methode to improve high efficient of railway systems. In this paper, railway vehicle, battery/catenary/Ucap models were built. Power distribution-algorithm which is electric power distribution strategies for some energy source topology between battery, Ucap and catenary was developed and simulated. If characteristics of battery, Ucap and catenary are reflected in the power distribution algorithm, running efficiency of railway vehicles will increase remarkably.