• Title/Summary/Keyword: Vehicle Dynamic Control System

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Improved Environment Recognition Algorithms for Autonomous Vehicle Control (자율주행 제어를 위한 향상된 주변환경 인식 알고리즘)

  • Bae, Inhwan;Kim, Yeounghoo;Kim, Taekyung;Oh, Minho;Ju, Hyunsu;Kim, Seulki;Shin, Gwanjun;Yoon, Sunjae;Lee, Chaejin;Lim, Yongseob;Choi, Gyeungho
    • Journal of Auto-vehicle Safety Association
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    • v.11 no.2
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    • pp.35-43
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    • 2019
  • This paper describes the improved environment recognition algorithms using some type of sensors like LiDAR and cameras. Additionally, integrated control algorithm for an autonomous vehicle is included. The integrated algorithm was based on C++ environment and supported the stability of the whole driving control algorithms. As to the improved vision algorithms, lane tracing and traffic sign recognition were mainly operated with three cameras. There are two algorithms developed for lane tracing, Improved Lane Tracing (ILT) and Histogram Extension (HIX). Two independent algorithms were combined into one algorithm - Enhanced Lane Tracing with Histogram Extension (ELIX). As for the enhanced traffic sign recognition algorithm, integrated Mutual Validation Procedure (MVP) by using three algorithms - Cascade, Reinforced DSIFT SVM and YOLO was developed. Comparing to the results for those, it is convincing that the precision of traffic sign recognition is substantially increased. With the LiDAR sensor, static and dynamic obstacle detection and obstacle avoidance algorithms were focused. Therefore, improved environment recognition algorithms, which are higher accuracy and faster processing speed than ones of the previous algorithms, were proposed. Moreover, by optimizing with integrated control algorithm, the memory issue of irregular system shutdown was prevented. Therefore, the maneuvering stability of the autonomous vehicle in severe environment were enhanced.

Performance Evaluation on an Active Camera Mount System for UAV via Hardware-in-the-loop-simulation (HILS를 통한 무인항공기 카메라 지지 능동 마운트 시스템의 진동제어 성능 평가)

  • Oh, Jong-Suk;Choi, Seung-Bok;Cho, Han-Jun;Lee, Chul-Hee;Cho, Myeong-Woo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.8
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    • pp.767-773
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    • 2010
  • In the present work, vibration control performance of piezoactuator-based active mount system for unmanned aero vehicle(UAV) equipment is evaluated via hardware in the loop simulation(HILS). At first, the vibration level of UAV is measured and from this vibration data, the proper piezostack actuator is selected. Then, the dynamic model of active mount system including four active mounts and UAV camera equipment is derived. In order to evaluate vibration control performance, the HILS system is constructed. The proposed mount is prepared as hardware part and the other mounts are considered in software part. A sliding mode controller is designed and implemented to the HILS system. Effective vibration control results are presented in both time and frequency domains.

A Study on Maneuvering Control Algorithm Based on All-wheel Independent Driving and Steering Control for Special Purpose 6WD/6WS Vehicles (전차륜 독립휠 구동 및 조향 제어 기반 특수목적용 6WD/6WS 차량의 주행제어 알고리즘 연구)

  • Lee, Daeok;Yeo, Seungtai
    • Journal of the Korea Institute of Military Science and Technology
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    • v.16 no.3
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    • pp.240-249
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    • 2013
  • This paper discusses the maneuvering control algorithm based on all-wheel independent driving and steering control techniques for special purpose 6WD/WS vehicles. The maneuvering control algorithms considering superior dynamic characteristics of high power in-wheel motors and independent steering system are designed to perform driving, steering, vehicle stability, and fault tolerant control. The maneuvering controller applies sliding and optimal control theories considering optimal torque distribution and friction circle related to the vertical tire force. The fault tolerant control algorithm is applied to obtain the similar maneuverability to that of the non-faulty vehicle. The simulations using the Matlab/Simulink dynamics model and experiments using HIL simulator mounting the real controllers with the designed control algorithms prove the improved performances in terms of vehicle stability and maneuverability.

The Simulation of Fuel Economy Considering Transient Control Condition in a Gasoline Engine Vehicle (가솔린 엔진 장착 차량에서 과도구간 제어특성을 고려한 연비주행모드 시뮬레이션)

  • Jung, Yeon-Sik;Park, Jin-Il;Lee, Jong-Hwa;Park, Kyoung-Seok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.5
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    • pp.106-112
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    • 2008
  • Modern vehicles require a high degree of refinement, including good drive ability to meet customer demands. Vehicle drive ability, which becomes a key decisive factor for marketability, is affected by many parameters such as engine control and the dynamic characteristics in drive lines. This paper focuses on the simulation of FTP-75 mode which is considered with spark timing control on transient condition. The acceleration is the most important factor for vehicle fuel economy. The retard of spark timing increases in proportion to acceleration. Likewise, bsfc(break specific fuel consumption) which is affected by spark timing also increases in proportion to acceleration. The result of simulation considered transient condition shows 0.3% of error comparing with a test on chassis-dynamometer.

A Study on the Appication of Semi-Active Supension Units for a Combat Vehicle by Using HILS (HILS를 활용한 전투차량의 반능동 현수장치 적용에 관한 연구)

  • Kim, Chi-Ung;Kim, Moon-June;Rhee, Eun-Jun;Lee, Kyoung-Hoon;Woo, Kwan-Je
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.6
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    • pp.967-975
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    • 2010
  • There have been a lot of efforts on the improvement for the ride comfort and handling stability of the combat vehicles. Especially most of vehicles for military purpose have bad inertial condition and severe operating condition such as the rough road driving, and need a high mobility in the emergency status. It is necessary to apply the controlled suspension system in order to improve the vehicle mobile stability and ride comfort ability of crews. A feasibility study is performed on the application of the semi-active suspension system with a magneto-rheological controlled shock absorber for a $6{\times}6$ combat vehicle. First, the dynamic simulation model of the vehicle including the control model for the semi-active suspension system was executed. Based on this model, a hardware-in-the-loop simulation(HILS) system which has a semi-active suspension controller hardware was constructed. After full vehicle simulations were performed in virtual proving courses with this system, the semi-active suspension system was proven to give better ride comfort and handling stability in comparison with the conventional passive suspension system.

A Study on the Intelligent Control Pattern of the Automatic Transmission in Tracked Vehicles (궤도차량용 자동변속기의 지능형변속패턴에 관한 연구)

  • 강서익
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1998.10a
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    • pp.216-221
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    • 1998
  • dynamic modelling method is applied to the driving simulation which has the calculable model of engine, transmission, vehicle. And driving pattern is used for database by actual tests and analyzed in neural network system. The simulation is compared to real test results and structures to the tracked vehicle powertrain.

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Development of Hardware-in-the loop Simulator for ABS/TCS (ABS 와 TCS 를 위한 HIL 시뮬레이터 개발에 관한 연구)

  • Lee, Han-Ju;Park, Yoon-Ki;Suh, Myung-Won
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.5 s.98
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    • pp.83-90
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    • 1999
  • The prevalence of microprocessor-based controllers in automotive system has greatly increased the need for tools which can be used to validate and test control system over their full range of operation. The objective of this paper is to develop a real time simulator of an anti-lock braking system and traction control system by the methodology of using hardware-in-the-loop simulation based on a personal computer. By use of this simulator, the analyses of commercial electronic control units and components for ABS/TCS were performed successfully. The simulator of this research can be applied to development of more advanced control system(such as vehicle dynamic control system) and other automotive system.

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A Study on the load control using electric inertia

  • Kim, Gil-Dong;Park, Hyun-Jun;Han, Young-Jae;Jang, Dong-Yuk;Jo, Jung-Min
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.128.1-128
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    • 2001
  • A propulsion system apparatus is needed for a railroad vehicle to test and estimate propulsion performance. The electrical inertia simulator to facilitate the development and testing of propulsion systems, is presented in this paper. It is based on a vector-controlled Induction motor drive supplied from the AC mains through a double PWM converter that provides desirable features such as hi-directional power folw, nearly unity power factor and low harmonic factor at the Ac mains. A theoretical analysis is first presented, followed by a detailed simulation study to assess the overall system performance under dynamic conditions.

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Provision of Two-area Automatic Generation Control by Demand-side Electric Vehicle Battery Swapping Stations

  • Xie, Pingping;Shi, Dongyuan;Li, Yinhong
    • Journal of Electrical Engineering and Technology
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    • v.11 no.2
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    • pp.300-308
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    • 2016
  • Application of demand-side resources to automatic generation control (AGC) has a great significance for improving the dynamic control performance of power system frequency regulation. This paper investigates the possibility of providing regulation services by demand-side energy storage in electric vehicle battery swapping stations (BSS). An interaction framework, namely station-to-grid (S2G), is presented to integrate BSS energy storage into power grid for giving benefits to frequency regulation. The BSS can be regarded as a lumped battery energy storage station through S2G framework. A supplementary AGC method using demand-side BSS energy storage is developed considering the vehicle user demand of battery swapping. The effects to the AGC performance are evaluated through simulations by using a two-area interconnected power grid model with step and random load disturbance. The results show that the demand-side BSS can significantly suppress the frequency deviation and tie-line power fluctuations.

The Design of the Feedback Control System of Electromagnetic Suspension Using Kalman Filter

  • Jo, Jeong-Min;Han, Young-Jae;Lee, Chang-Young
    • International Journal of Railway
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    • v.4 no.4
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    • pp.93-96
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    • 2011
  • The basic element of the EMS suspension is the electromagnet system, which suspends the vehicle without contact by attracting forces to the rails at the guideway. The suspension of a vehicle by attractive magnetic forces is inherently unstable and consequently it is continuously adjusted by the strength of the suspending electromagnet from rail irregularity and bending of the guideway. In order to improve reliable tracking, it needs to get feedback signals without measurement delay time. In this paper the concept of feedback control system with Kalman Filter in EMS is proposed. The input signals in the feedback control system are an air-gap and an acceleration signal. The air-gap signal with noise from the gap sensor is transformed to the filtered air-gap signal y without measurement delay time by using Kalman Filter. The filtered air-gap signal is transformed to a relative velocity and a relative acceleration signal. Then it multiplies these values by gain matrix in order to get the actuator's reference voltage value. The simulation results show that the dynamic responses of the suspension system can be improved by reducing the influence of measurement delay time of air-gap signals.

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