• Title/Summary/Keyword: Fully driving

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Improvement of Washout Algorithm for Vehicle Driving Simulator Using Vehicle Tilt Data and Its Evaluation (차량 기울기값을 이용한 차량 시a레이터용 워시아웃 알고리즘에 대한 개선 및 평가)

  • Moon, Young-Geun;Kim, Moon-Sik;Kim, Kyung-Dal;Lee, Min-Cheol
    • Journal of Institute of Control, Robotics and Systems
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    • v.15 no.8
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    • pp.823-830
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    • 2009
  • For developing automotive parts and telematics devices the real car test often shows limitation because it needs high cost, much time and has the possibility of the accident. Therefore, a Vehicle Driving Simulator (VDS) instead of the real-car test has been used by some automotive manufactures, research centers, and universities. The VDS is a virtual reality device which makes a human being feel as if one drives a vehicle actually. Unlike actual vehicle, the simulator has limited kinematic workspace and bounded dynamic characteristics. So it is difficult to simulate dynamic motions of a multi-body vehicle model fully. In order to overcome these problems, a washout algorithm which restricts workspace of the simulator within the kinematic limits is needed, and analysis of dynamic characteristics is required also. However, a classical washout algorithm contains several problems such as time delay and generation of wrong motion signal caused by characteristics of filters. Specially, the classical washout algorithm has the simulator sickness when driver hardly turns brakes and accelerates the VDS. In this paper, a new washout algorithm is developed to enhance the motion sensitivity and improve the simulator sickness by using the vehicle tilt signal which is generated in the real time vehicle dynamic model.

A Study of the Effect using Ramp Waveform on the Address Period of Address Display Separated Operating in ac Plasma Display Panel (AC-PDP의 ADS 구동방식에서 어드레스 구간에 기울기파를 사용한 효과에 관한 연구)

  • Joung, Bong-Kyu;Kim, Ji-Sun;Kwon, Shi-Ok;Hwang, Ho-Jung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.18 no.2
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    • pp.180-186
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    • 2005
  • As a driving method of AC-PDP, Address-Display Separated(ADS) driving has been widely adopted for its simple architecture and low discharge failure rate. However, a high definition like a HDTV has defect of long addressing time by reason of a number of pixels. Priming effect isn't fully sustained because of long addressing time during the address period. Therefore, it has different wall charge and luminance of each addressing time in the sustain period. In this study, we suggest a new driving waveform on the address period to improve these defects. We applied a ramp waveform, instead of a square waveform, to an address period in ADS, for operating on the AC-PDP, which used the conventional gas [He-Ne-Xe]. When the ramp waveform is applied to the address period, we experimented for uniform wall charge and the improved luminance by sustained Priming effect at each addressing time in the sustain period.

A Framework for Calculating the Spatiotemporal Activation Section of LDM-Based Autonomous Driving Information (동적지도정보 기반 자율주행 정보의 시공간적 활성화 구간 산정 프레임워크)

  • Kang, Chanmo;Chung, Younshik;Park, Jaehyung
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.42 no.4
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    • pp.519-526
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    • 2022
  • Basically, autonomous vehicles drive using road and traffic information collected by various sensors. However, it is known that there is a limitation to realizing fully autonomous driving with only such technologies and information. In recent, various efforts are being made to overcome the limitations of sensor-based autonomous driving, and efforts are also underway to utilize more specific and accurate road and traffic information, called local dynamic map (LDM). However, LDM-related data standards and specifications have not yet been sufficiently verified, and research on the spatiotemporal scope of LDM during autonomous driving is extremely limited. Based on this background, the purpose of this study is to identify these limitations through an analysis of previous LDM-related studies and to present a framework for calculating the spatiotemporal activation section of LDM-based road and traffic information.

The Latest Poly-Si TFT Circuit Technologies for System-On-Glass LCD

  • Nakajima, Yoshiharu;Maki, Yasuhito
    • 한국정보디스플레이학회:학술대회논문집
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    • 2004.08a
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    • pp.69-74
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    • 2004
  • System-on-glass technology made with low temperature poly-Si TFT has been rapidly advancing in recent years. We have developed a low-power, narrow edged frame, 1.9inch system-on-glass LCD which fully integrates a 16-bit RGB interface driver and all power circuits required for driving the LCD. In this paper, the latest poly-Si TFT circuit technologies used in the newly developed LCD are discussed. The development trends are also reviewed.

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A Driving Method and Precise Repetitive Control of BLDC Motor (BLDC 모터의 구동방법과 정밀 반복제어)

  • 이충환
    • Journal of Advanced Marine Engineering and Technology
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    • v.22 no.6
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    • pp.928-934
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    • 1998
  • This paper describes a fully digitalized driver for BLDC motors which is realized by a single chip microprocessor. The speed change can be done by using the signal obtained from the position detecting sensor and adjusting the pulse width at the input channel of power module. In order to establish a speed control system a repetitive control method is adopted to track a periodic refer-ence change in the BLDC motor system. The experimental results show accurate reference track-ing performance under the given periodic reference in the repetitive controller design.

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Driving Characteristics of SRM with an Auxiliary Fully Pitched Winding

  • Jung, Tae-Uk;Oh, Seok-Gyu;Ahn, Jin-Woo;Hwang, Young-Moon
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.763-767
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    • 1998
  • In this paper, we analyzed the characteristics and source of vibration and acoustic noise in SRM drives. The paper study the reduction technique of those by new SRM which has auxiliary field winding. The operating mechanism and vibration and acoustic noise characteristics is examined. This paper suggests the control strategies of auxiliary field winding in order to reduce vibration and acoustic noise.

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Scanning Electrode Driver IC Development for TFT Matrix-Type Liquid Crystal Panel (TFT Matrix형 액정판넬의 주사전극 구동 IC 개발)

  • 이화이;정교영;변상기;유영갑
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.29B no.9
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    • pp.27-36
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    • 1992
  • A design of scanning electrode driving IC chip has been implemented aiming at the application to liquid crystal color television displays. The chip reflects the design characteristics of high quality liquid crystal panels and satisfies specifications of NTSC type color television displays. The design was verified using logic and circuit simulation, and fabricated using a high voltage CMOS process. A fully working die has been obtained that can be readily applicable to commercial color liquid crystal panels.

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Development of a Workload Assessment Index Based on Analyzing Driving Patterns (운전자 주행패턴을 반영한 작업부하 평가지표 개발)

  • KIM, Yunjong;LEE, Seolyoung;CHOI, Saerona;OH, Cheol
    • Journal of Korean Society of Transportation
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    • v.35 no.6
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    • pp.545-556
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    • 2017
  • Various assessment indexes have been developed and utilized to evaluate the driver workload. However, existing workload assessment indexes do not fully reflect driving habits and driving patterns of individual drivers. In addition, there exists significant differences in the amount of workload experienced by a driver and the ability to overcome the driver's workload. To overcome these limitations associated with existing indexes, this study has developed a novel workload assessment index to reflect an individual driver's driving pattern. An average of the absolute values of the steering velocity for each driver are set as a threshold value in order to reflect the driving patterns of individual drivers. Further, the sum of the areas of the steering velocities exceeding the threshold value, which is defined as erratic steering area (ESA) in this study, was quantified. The developed ESA index is applied in evaluating the driver workload of manually driven vehicles in automated vehicle platooning environments. Driving simulation experiments are conducted to collect drivers' responsive behavior data which are used for exploring the relationship between the NASA-TLX score and the ESA by the correlation analysis. As a result, ESA is found to have the greatest correlation with the NASA-TLX score among the various driver workload evaluation indexes in the lane change scenario, confirming the usefulness of ESA.

Development and Evaluation of Automatic Pothole Detection Using Fully Convolutional Neural Networks (완전 합성곱 신경망을 활용한 자동 포트홀 탐지 기술의 개발 및 평가)

  • Chun, Chanjun;Shim, Seungbo;Kang, Sungmo;Ryu, Seung-Ki
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.17 no.5
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    • pp.55-64
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    • 2018
  • In this paper, we propose fully convolutional neural networks based automatic detection of a pothole that directly causes driver's safety accidents and the vehicle damage. First, the training DB is collected through the camera installed in the vehicle while driving on the road, and the model is trained in the form of a semantic segmentation using the fully convolutional neural networks. In order to generate robust performance in a dark environment, we augmented the training DB according to brightness, and finally generated a total of 30,000 training images. In addition, a total of 450 evaluation DB was created to verify the performance of the proposed automatic pothole detection, and a total of four experts evaluated each image. As a result, the proposed pothole detection showed robust performance for missing.

Roundabout Design and Intervehicle Distance Measure for V2X-based Autonomous Driving (V2X 기반 자율운전을 위한 회전교차로 설계 및 차간 거리 측정)

  • Hwang, Jae-Jeong;Oh, Seok-Hyung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.22 no.6
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    • pp.83-89
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    • 2021
  • To improve the performance of self-driving cars, the introduction of V2X, a communication technology that connects vehicles, infrastructure, and vehicles, is essential. Even if traffic information of the other vehicle is known, the structure of the intersection and a distance calculation algorithm are required for accurate calculations at roundabouts. This paper proposes a design algorithm for a rotating intersection and implemented in Matlab that complies with the national design rules and enables accurate calculations. Assuming the roundabout and the entrance/exit path to be a circle, a method for measuring the distance between vehicles at an arbitrary point was proposed using the horizontal shift of the entrance circle to the main circle. The algorithm could be used in fully autonomous vehicles by designing a roundabout suitable for the terrain by arbitrarily varying the angle between branches and the radius of curvature of the entrance and exit roads, and transmitting a warning signal when a collision between two driving vehicles is expected.