• Title/Summary/Keyword: Vehicle Powertrain

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An Analysis Study for Thermal Design of ISG (Integrated Starter & Generator) for Hybrid Electric Vehicle (하이브리드 차량용 ISG(Integrated Starter Generator)의 방열 설계를 위한 해석적 연구)

  • Kim, Dae Geon;Kim, Sung Chul
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.4
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    • pp.120-127
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    • 2013
  • Hybrid electric vehicles have applied electric parts for saving fuel consumption and reducing levels of environmental pollution. Electrification of automobiles is indispensable for entering into global market because of enhanced environment restriction. ISG (Integrated Starter & Generator) system is one of main electric parts and can improve fuel efficiency more than other components by using Idle Stop & Go function and regenerative braking system. However, if ISG motor and inverter work under the continuously high load condition, it will make them the decrease of performance and durability. So the ISG motor and inverter need to properly design the cooling system of them. In this study, we suggested the enhancement points by modifying the thermal design of ISG motor and then confirmed the improvement of the cooling performance.

Prediction of the noise radiated by the structural vibration of a powertrain (파워트레인 구조진동으로 인한 방사소음 예측에 관한 연구)

  • Oh, Ki-Seok;Lee, Sang-Kwon;Kim, Sung-Jong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.05a
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    • pp.891-896
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    • 2007
  • Noise radiated from the powertrain is an important factor of the vehicle interior noise. In this paper, Finite Element(FE) model and Boundary Element(BE) models were created. The FE model was updated by doing a correlation between experimental modal analysis(EMA) values and finite element analysis(FEA) values. Main bearing forces were calculated using a running modal data. The forced vibration analysis was simulated using the software MSC/NASTRAN, and the radiated noise was predicted using the software LMS/VIRTUAL.LAB.

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Performance Optimization of Electromagnetic Active Engine Mount (전자식 능동 엔진 마운트 성능 최적화)

  • Kim, Won-Kyu;Kim, Youn-Su;Lee, Wan-Chul;Hong, Sung-Woo;Kim, Gui-Han
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2011.04a
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    • pp.514-519
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    • 2011
  • Recently, the interest in technologies for a highly efficient powertrain, i.e. a variable displacement engine or a light weight car body, to improve the fuel efficiency of automobile saving the environment has been increased. However this trend deteriorates NVH performance of a vehicle and the use of a conventional engine mounting system becomes unsatisfactory. In order to solve this dilemma, an active engine mounting system that could isolate or cancel out vibrations occurred at the powertrain was suggested. In this paper, In order to optimize the electromagnetic active engine mount performance, the actuator of the engine mount through FEM analysis and optimal design, noise and elastomer testing of the prototype through the optimal design of actuators for the electromagnetic active engine mount on the impact of the performance improvement is verified.

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Computer Simulation of Powertrain Forced Torsional Vibration (차량주행시 동력전달계의 강제진동 해석)

  • 최은오;안병민;홍동표
    • Journal of KSNVE
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    • v.7 no.5
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    • pp.853-860
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    • 1997
  • For this study, the multi-degree of freedom analysis model of torsional vibration was developed. This model is combined with mass moment of inertia and torsional spring in two wheel drive and four wheel drive vehicle. We compared and analyzed torsional vibration characteristics by natural frequencies and mode shapes which are obtained by free vibration analysis of this model. And we studied torsional vibration contribution of driveline elements by performing the forced vibration analysis of engine excitation torque. The validity of this model is demonstrated by the field test. The reduction effect of the torsional vibration along the driveline design factor is presented by the analytical results.

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The Development and Implementation of Model-based Control Algorithm of Urea-SCR Dosing System for Improving De-NOx Performance and Reducing NH3-slip (Urea-SCR 분사시스템의 DeNOx 저감 성능 향상과 NH3 슬립저감을 위한 모델 기반 제어알고리즘 개발 및 구현)

  • Jeong, Soo-Jin;Kim, Woo-Seung;Park, Jung-Kwon;Lee, Ho-Kil;Oh, Se-Doo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.1
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    • pp.95-105
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    • 2012
  • The selective catalytic reduction (SCR) system is a highly-effective aftertreatment device for NOx reduction of diesel engines. Generally, the ammonia ($NH_3$) was generated from reaction mechanism of SCR in the SCR system using the liquid urea as the reluctant. Therefore, the precise urea dosing control is a very important key for NOx and $NH_3$ slip reduction in the SCR system. This paper investigated NOx and $NH_3$ emission characteristics of urea-SCR dosing system based on model-based control algorithm in order to reduce NOx. In the map-based control algorithm, target amount of urea solution was determined by mass flow rate of exhaust gas obtained from engine rpm, torque and $O_2$ for feed-back control NOx concentration should be measured by NOx sensor. Moreover, this algorithm can not estimate $NH_3$ absorbed on the catalyst. Hence, the urea injection can be too rich or too lean. In this study, the model-based control algorithm was developed and evaluated on the numerical model describing physical and chemical phenomena in SCR system. One channel thermo-fluid model coupled with finely tuned chemical reaction model was applied to this control algorithm. The vehicle test was carried out by using map-based and model-based control algorithms in the NEDC mode in order to evaluate the performance of the model based control algorithm.

Vehicle Traction Control System using Fuzzy Logic Theory (퍼지논리를 이용한 차량 구동력 제어 시스템)

  • 서영덕;여문수;이승종
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.5
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    • pp.138-145
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    • 1998
  • Recently, TCS(Traction Control System) is attracting attention, because it maintains traction ability and steerability of vehicles on low-$\mu$ surface roads by controlling the slip rate between tire and road surface. The development of TCS control law is difficult due to the highly nonlinearity and uncertainty involved in TCS. A fuzzy logic approach is appealing for TCS. In this paper, fuzzy logic controller for TCS is introduced and evaluated by the computer simulation with 8 DOF vehicle model. The result indicate that the fuzzy logic TCS improves vehicle's stability and steerability.

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Reduction of Booming Noise Using Damper Clutch Disk on the Drive Shaft of Commercial Small Truck (상업용 소형 트럭의 구동축에서 댐퍼 클러치 디스크를 이용한 부밍 소음 저감)

  • Kim, Yong Dae;Choi, Byungjae
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.25 no.6
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    • pp.377-383
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    • 2015
  • Torsion mode or bending mode of drive-line for rear-wheel drive vehicle exists in low frequency band. If resonance exists there between natural mode of driveline and powertrain excitation force, drive-line will manifest excessive vibration response. Also, the vibration response can be transmitted to vehicle body and can induce booming noise. A vehicle in this study exhibits a booming noise problem under specific transmission gear condition. To draw performance improvement plan, finite element analysis technique was used. Modification was evaluated qualitatively and priorities were derived. Finally, effectiveness of best modification was verified through test and full vehicle FE analysis.

Simulation Study on the Fuel Economy of Plug-in Type Hybrid Electric Vehicle (외부충전 방식 하이브리드 전기자동차의 연비 시뮬레이션)

  • 최득환;김현수
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.5
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    • pp.121-128
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    • 2002
  • In this paper, the fuel economy of plug-in type hybrid electric vehicle is investigated through simulation. For the simulation study, 2 shaft type parallel hybrid powertrain is chosen and its operation modes are described. The operation algorithm which yields operation points of minimal fuel cost is suggested. Dynamic model fur operation of HEV and simulation procedure is described. Simulation results of fuel economy is compared to non plug-in type HEV as well as conventional vehicle. With total driving distance of 37km and full usage of 2kwh of electric energy stored in battery pack, plug-in type HEV shows 28-30% improved fuel economy compared to non plug-in type HEV and 86-93% improved fuel economy compared to conventional vehicle.

Modeling and Analysis of the Speed Profiles for the Gasoline Hybrid Vehicle in the Real Driving Emission Test (가솔린 하이브리드 차량의 실도로 배기규제 평가를 위한 구간 주행 속도 특성 분석 및 해석 모델 개발 연구)

  • Seongsu Kim;Minho Lee;Kyoungha Noh;Junghwan Kim
    • Journal of ILASS-Korea
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    • v.28 no.4
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    • pp.184-190
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    • 2023
  • The European Union has instituted a new emission standard protocol that necessitates real-time measurements from vehicles on actual roads. The adequate development of routes for real driving emissions (RDE) mandates substantial resources, encompassing both vehicles and a portable emission measurement system (PEMS). In this study, a simulation tool was utilized to predict the vehicle speed traversing the routes developed for the RDE measurements. Initially, the vehicle powertrain system was modeled for both a gasoline hybrid vehicle and a gasoline engine-only vehicle. Subsequently, the speed profile for the specified vehicle was constructed based on the RDE route developed for the EURO-6 standard. Finally, the predicted vehicle speed profiles for highway and urban routes were assessed utilizing the actual driving data. The driving model predicted more consistency in the vehicle speed at each driving section. Meanwhile, the human driver tended to accelerate further, and then decelerate in each section, instead of cruising at a predicted section speed.

Analysis of the Shifting Transients from the Passenger Car with an Automatic Transmission considering the Vehicle Model (차량 모델을 고려한 자동변속기 차량의 변속 과도 특성 분석)

  • 공진형;박진호;김정윤;임원식;박영일;이장무
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.4
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    • pp.154-162
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    • 2004
  • In this study, a mathematical model for analyzing the shifting transients of the passenger car with an automatic transmission is proposed. The proposed model comprises a power transmission system and a vehicle system, which are coupled. In order to extract the modeling parameters, on-road car test is carried out. The model is composed of a detailed powertrain, an engine/AT housing, a simplified suspension system, tires and a vehicle body model. On the test, the vehicle accelerations and pitch ratio are measured by using accelerometers and a gyro sensor. The speeds, the brake signal, and the throttle position are taken from sensors which already exist in the vehicle. Considering natural ftequencies, which is calculated from the measured accelerations, and the characteristic equation, vehicle model parameters are identified. Dynamic behaviors during upshift or downshift are simulated using the proposed vehicle model. By comparing and analyzing the simulation result and on-road car test data, the vibration of the Engine/AT housing influences the shifting transients. The effect of model parameters are also studied. Among model parameters, the location of engine mountings influences the vibration of the vehicle body.