• Title/Summary/Keyword: Vehicle Steering

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A Study on the Turning Performance for the Bimodal Tram (바이모달 트램 선회성능에 관한 연구)

  • Moon, Kyeong-Ho;Lee, Kang-Won;Mok, Jai-Kyun;Chang, Se-Ky
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.301-306
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    • 2011
  • The rear of the vehicle generally overhangs the rear axle. As a result, the rear of a vehicle swings to the outside of the rear axle(rear swing-out). In front steering vehicles, rear swing-out is not important because rear swing-out values measured outside the rear edge are relatively small. However, in the case of the bimodal tram with AWS(all wheel steering), the rear swing-out values increase because of the rear steering at a reverse phase angle. Off-tracking is defined as the radial offset between the path of the centerline of the front axle and the path of the centerline of the following axle. In this paper, in addition to determine the turning performance of bimodal tram with AWS, turning radius, swing-out, off-tracking and swept path width were also investigated.

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Implementation of a Controller in a Steering Feel Simulator for SBW systems (SBW시스템을 위한 조향반력 시뮬레이터의 제어기 구현)

  • Park, Won-Yong;You, Choon-Young;Kim, Il-Hwan;Heo, Seung-Jin;Ahn, Hyun-Sik
    • Proceedings of the KIEE Conference
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    • 2008.10b
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    • pp.318-319
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    • 2008
  • In this paper, a steering feel simulator is designed and implemented using a steering wheel with a rotation angle sensor, torque sensor, and an ac motor for the generation of the required torque. The controller in the simulator consists of a 16-bit micro-controller, a D/A converter and A/D converters. The main objective of the controller is to perform torque control where the reference torque is calculated from the torque map for both the vehicle velocity and the wheel sensor cutout. It is shown via the experimentation using the proposed simulator that the simulator output performance can be easily understood for the variation of vehicle parameters or controller parameters.

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Dynamic Performance Analysis for 4WD/4WS Electric-driven Vehicles (4WD/4WS 전기 구동 차량의 동역학적 성능 해석)

  • 김준영;계경태;박건선;허건수;장경영;오재응
    • Transactions of the Korean Society of Automotive Engineers
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    • v.4 no.2
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    • pp.209-220
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    • 1996
  • In this paper, dynamic performance of 4WD/4WS Electric-driven vehicles is investigated. A coupled dynamic model is introduced for longitudinal, lateral and yawing motion of 4WD/4WS vehicles. Based on the coupled model, dynamic performance is analyzed for steady-state steering, acceleration steering and brake steering, respectively. These non steady-state cornering analysis is important for non-paved road maneuvering, trajectory projection for armored vehicle and future AVCS(Advanced Vehicle Control System) technology. Simulation results are obtained based on a simulink module for the introduced model.

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Integrated Chassis Control with Electronic Stability Control and Active Front Steering under Saturation of Front Lateral Tire Forces (전륜 횡력의 포화를 고려한 ESC와 AFS의 통합 섀시 제어)

  • Yim, Seongjin
    • Journal of Institute of Control, Robotics and Systems
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    • v.21 no.10
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    • pp.903-909
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    • 2015
  • This article presents an integrated chassis control with electronic stability control (ESC) and active front steering (AFS) under saturation of front lateral tire force. Regardless of the use of AFS, the front lateral tire forces can be easily saturated. Under the saturated front lateral tire force, AFS cannot be effective to generate a control yaw moment needed for the integrated chassis control. In this paper, new integrated chassis control is proposed in order to limit the use of AFS in case the front lateral tire force is saturated. Weighed pseudo-inverse control allocation (WPCA) with variable weight is adopted to adaptively use the AFS. To check the effectiveness of the proposed scheme, simulation is performed on a vehicle simulation package, CarSim. From simulation, the proposed integrated chassis control is effective for vehicle stability control under saturated front lateral tire force.

Turning characteristics of articulated vehicles related to geometric design (기하학적 디자인과 관련한 굴절차량의 선회 특성 검토)

  • Moon, Kyeong-Ho;Mok, Jai-Kyun;Chang, Se-Ky;Kim, Yeon-Su;Lee, Soo-Ho
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.698-704
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    • 2007
  • Articulated vehicles which have a pivoting joint allowing the vehicle to rotate more easily are difficult to turn the curves because of their long length. In order to review operational safety, turning characteristics related to geometric design should be investigated when articulated vehicles run on the road which can be interfered with other vehicles. The vehicles to review the turning characteristics are the normal articulated bus in Seoul with FWS(front wheel steering) and new bimodal tram with AWS(all wheel steering). Steering characteristics and geometric design were investigated such as turning radius, offtracking, swept path width and swingout. The results were reviewed with respect to the standards of vehicle safety and road design.

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Research on Hydraulic System Design and Vehicle Dynamic Modeling for the Development of Tire Roller (타이어 로울러 개발을 위한 유압 시스템 설계 및 차량 동역학적 모델링에 관한 연구)

  • 김상겸;김준호;이운성;김정하
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.2
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    • pp.201-211
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    • 2002
  • In this research, we are trying to research about hydraulic system design and vehicle dynamic modeling far the development of the tire roller. The reason why we would like develop it is that tire roller is one of the most useful machine for the road construction site and application other construction equipments. Here, we conceptualize the new hydraulic system and derive the equations of motion fur dynamic analysis and also investigate system modeling by using a DAQ board. We design the hydraulic circuit of steering and traction mechanism system. This design can be used to create virtual prototypes of construction equipment. So, we studied tire roller to integrate development technology. In system analysis, we formulate hydraulic traction system model and hydraulic steering system model. Also, we integrate DAQ system to acquire experimental results in real tire roller equipment.

Evaluation of Performance and Development of Control Method of a New Electric Power Steering System(EPS-TT) (새로운 전동식 동력 조향 장치 (EPS-TT)의 성능 평가 및 제어방법 개발)

  • 송정훈;부광석;이종일
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.5
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    • pp.154-161
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    • 2004
  • A new column type electric power steering system (EPS-TT) is proposed in this study. The remarkable features of EPS-TT are its opto-isolated torque sensor and assist torque control methodology. EPS-TT uses a uni-directional motor and two clutches. Full order and simplified models for EPS-TT are developed to evaluate the EPS-TT. A full car model is also used to investigate the vehicle responses. A PID control logic is designed to control the torque of the assist motor. Various sinusoidal inputs are applied to the system and the resulting performances are analyzed. The results prove that the performances achieved by the EPS-TT are improved compared to those of a conventional EPS-TT across the frequency domain. In addition, it is inexpensive and easy to control the motor. The results of the full order steering system model are similar to those simplified model, but the vehicle responses are slightly different.

A Performance Evaluation Method of a Steering HILS System for Vehicle Mechatronic System Development and Test (차량 메카트로닉스 시스템 개발 및 시험을 위한 조향 HILS 시스템의 성능평가 방법론)

  • 김희수;류제하;임재우
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.3
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    • pp.164-172
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    • 2001
  • Various HILS systems for developing and testing vehicle mechatronic systems have been proposed and constructed during the last few years. However, performance of those systems have not been evaluated in a systematic way. Based on the transfer function approach, this paper presents a method far evaluating performance such as stable dynamic simulation range of a proposed steering HILS system. In the evaluation, we have investigated effects of time delays that exist in the real-time dynamic simulation, additional actuators, and data transmission on the stable dynamic simulation range, simulation frequency range, and steering feel. This evaluation methodology may be useful to help engineers develop a HILS system for their own purposes.

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