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하경표(Kyoung-Pyo Ha),공진국(Jin Kook Gong),김우태(Woo Tae Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The mechanical energy of engine is lost by engine friction and in driving the engine's auxiliary components, and then transmitted to transmission. Thus, it is very important to know the exact value of engine friction and the driving torque of engine's auxiliary components in order to reduce fuel consumption of engine by reducing these losses. And, it is also helpful to know the braking torque of engine in vehicle so as to improve vehicle's driving performance. For these reasons, present study developed engine torquemeter for in-vehicle application, and measured braking torque of engine in vehicle and analyzed fuel consumption contributions of engine's auxiliary components.
확장 칼만 필터를 이용한 자동변속기 차량의 구동토크 관측기 설계
한경석(Kyoungseok Han),최세범(Seibum Choi) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Ride quality of vehicles is very closely concerned with smooth clutch control and it has been improved by accurate estimation of clutch torque or output shaft torque. Unfortunately, Torque sensors or high precision encoders for rotating shafts are seldom used in production cars because of their costs, maintenances and installations. So, it is required to estimate drive shaft torque with accessible values such as wheel rotate speed, engine rotate speed. In this paper, Extended Kalman Filter(EKF) is used to estimate shaft torque because of applicable to nonlinear systems and characteristics of its robustness to model uncertainties. Well known driveline model was used to construct observers and then observers are validated with Carsim and Matlab/Simulink which is well known as a vehicle dynamic simulator.
롤투롤 인쇄압력 균일화를 위한 개별구동 교차결합 토크제어시스템
박지민(Jimin Park),김영진(Youngjin Kim),김형래(Hyeongrae Kim),김주연(Juyeon Kim),오동호(Dongho Oh) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.7
롤투롤 인쇄전자 공정은 기능성 잉크를 롤의 요철면을 이용하여 필름 또는 절연기판 등에 인쇄하여 전자소자, 전자제품을 만드는 공정이며 인쇄품질을 향상시켜 다양한 분야에서 상용화하기 위해 많은 연구가 진행되고 있다. 본 연구에서는 롤의 런아웃을 측정함으로 롤의 형상을 추정하고, 임프레션롤과 플레이트롤의 관계를 모델링하여 상태공간방정식으로 표현한다. 또한, 롤투롤 공정에서 토크제어시스템에 대해 인쇄압력을 얼마나 균일하게 수렴하도록 제어하는지에 대한 실험으로 제어 성능을 비교한다. 그리고, 실험 결과를 토대로 제어 성능을 개선시키기 위해 교차결합제어(cross-coupled-control)를 이용한 개별구동 교차결합 토크제어시스템을 설계 및 실험을 통해 검증한다. Roll-to-roll printing is a process in which electronic devices and electronic products are produced by printing functional ink on a film or an insulating substrate using the surface of a roll. Many studies have been conducted to commercialize roll-to-roll printing in various fields by improving the print quality. In this study, the shape of the roll is measured through a runout, and the relationship between the impression and plate rolls is modeled and expressed through state space equations. Experiments are then conducted to compare and verify the control performance of the one-degree-of-freedom (1-DOF) and 2-DOF torque control systems. Finally, an individual drive cross-coupled torque control system using cross-coupled control is designed to improve the torque control system for more uniform printing pressure.
밭농업용 다목적 플랫폼의 견인동력 및 구동토크 예측을 위한 시뮬레이션 모델 개발 및 검증
전현호,백승민,백승윤,홍이수,김택진,최용,김영근,이상희,김용주 사단법인 유공압건설기계학회 2023 드라이브·컨트롤 Vol.20 No.1
Although the upland field area of Korea is high as 44.8%, the platform optimized for the upland field is insufficient. It is necessary to develop an optimized platform for the upland field because the upland field environment is an irregular environment with many slopes. In addition, due to the characteristic of agricultural operations, the traction power and torque of the platform have to be sufficient. Therefore, in this study, a simulation model that can predict the traction power and driving torque of a crawler-type platform for the upland field was developed and validated using the specifications of the crawler platform. The simulation model was developed using Amesim (19.1, Siemens, Germany). The development of the model was conducted using the specifications of the platform. A measurement system was developed to validate the simulation model. The traction power data of the simulation model was validated with the traction force and vehicle speed. The driving torque data of the simulation model was validated with the torque of the sprocket on the crawler system. As a result of the analysis, the error between measurement and simulation results occurred within 10%, and it was determined that the traction power and driving torque prediction of the crawler platform using this model was possible.
최병현,최혁렬 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.11
Ultrasonic motors(USM) has been emerging as one type actuators, which possess many advantages such as high torque, low weight, compact size and no magnetic field generation. In spite of these features, there are several problems to be solved, which are temperature rise in case of long term operation, non -linearity, and hysteresis. Among these, hysteresis cause the most serious problem in force/torque control applications. To cope with this paper we propose a new PWM driving method which can be applied to force/torque control applications. To cope with this problem, in this paper we propose a new PWM driving method which can applied to force/torque control of USM. To verify the proposed method, an experimental setup was built and several experiments were performed.
4륜구동 인휠 전기자동차의 주행 효율 향상을 위한 구동력 분배 알고리즘
송현우(Hyeonwoo Song),이용관(Yongkwan Lee),백진주(Jinjoo Baek),박종혁(Jonghyuk Park),황성호(Sung-Ho Hwang) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The purpose of this paper is to construct a control algorithm for improvement in driving efficiency of 4-wheel-drive in-wheel electric vehicles. Main parts of vehicle were modeled and input-output relations of signals were summarized using MATLAB/Simulink. Performance simulator for 4-wheel-drive in-wheel electric vehicles was developed based on co-simulation environment with a commercial dynamic behavior analysis program called Carsim. Also for improvement in driving efficiency of vehicles, a torque distribution algorithm that distributes torque to front and rear wheels was included in the performance simulator. Validity of the torque distribution algorithm was demonstrated based on simulation on changes in SOC caused by use of the torque distribution algorithm.
4륜구동 차량의 구동토크 배분이 조종 안정성에 미치는 영향
강대하(Dae Ha Kang),이진화(Jin Hwa Lee),김상섭(Sang Sup Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This paper presents a vehicle dynamics model with detailed drive train model to analyse handling performance of 4WD Vehicle vehicle with varying torque distribution. The functional suspension model was used to derive a full vehicle dynamics model with kinematic and compliance characteristics of suspensions. The drive train is modeled with front, rear and center differential gears and soft flexibility. A wheel dynamics model with tire relaxation effects was used for more realistic simulation. Several simulation results of 4WD vehicles demonstrate the effectiveness of current model to evaluate torque distribution effects on handling performance.
자동차 파워트레인용 경량 알루미늄 구동축의 동적 진동설계
김현식 한국기계기술학회 2017 한국기계기술학회지 Vol.19 No.1
In this study, we changed the existing S45C steel shafts applied to the drive shaft for power train of automotive to Al7003-T6 aluminum material. For this purpose, the optimal inner diameter of the aluminium shaft is established. And, analysis of the stresses and vibration characteristics of shafts were analyzed through finite element analysis. The final aluminum drive shaft was evaluated through the static torsional torque test and the frequency test. The Al7003-T6 aluminum drive shaft's weight is 67% comparing from 100% of shaft with existing steel, and with the performance of 3,276 N-m and 236 Hz, it satisfies requirements of the torsional torque of 3,000 N-m and vibration characteristic over 150 Hz required for drive shaft.
직접 구동형 서보밸브와 전진 보상기를 적용한 유압식 토크 부하 시뮬레이터의 설계에 관한 연구
이성래 사단법인 유공압건설기계학회 2018 드라이브·컨트롤 Vol.15 No.1
Hydraulic torque load simulator is essential to test and qualify the performance of various angle control systems. Typically a flapper-type second stage servovalve is applied to the load simulator, but here the direct drive servovalve, which is a kind of one-stage valve and affected by the large flow force, is applied . Since the torque load is applied not to the stationary shaft but to the rotating shaft of the angle control system, the controlled torque of load simulator is not accurate due to the rotating speed of the angle control system. A feedforward compensator is designed and applied to minimize the disturbance-like effect. A mathematical model is derived and linearized to analyze the stability, accuracy and responsiveness of the torque load simulator. The parameter effects of a controller, servovalve, hydraulic motor, rotating spring shaft are analyzed and summarized. The goodness of the linear analysis is verified by the digital computer simulations using both the linear and nonlinear mathematical models.
Analysis of the Main Factor of Wheel Loader Torque via Wireless Measurements
Byung-Ik Kang(강병익),Hong-Il Dong(동홍일),Byung-Ki Kim(김병기),Yong-Hun Choi(최용훈) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.4
Measuring the torque of the wheel loader of a driving device is a preemptive task to ensure its performance. In this study, wireless torque measurements were successfully conducted. Moreover, based on the experimental results and the adopted design method, the key factor of torque generation, which is the main load in driving devices, was analyzed. Other data not analyzed in this paper will be the basis for the logical design of wheel loader-based driving devices.