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전륜 제동력 및 전륜 조향각을 이용한 SUV 차량의 통합운동제어시스템 개발
송정훈(Jeonghoon Song) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.5
An integrated front steering system and front brake system (FSFB) is developed to improve the stability and controllability of an SUV. The FSFB simultaneously controls the additional steering angle and front brake pressure. An active front steering system (AFS) and an active front brake system (AFB) are designed for comparison. The results show that the FSFB enhances the lateral stability and controllability regardless of road and running conditions compared to the AFS and AFB. As a result, the yaw rate of the SUV tracks the reference yaw rate, and the side slip angle decreases. In addition, brake pressure control is more effective than steering angle control in improving the stability and steerability of the SUV on a slippery road. However, this deteriorates comfort on dry or wet asphalt.
능동 전륜 조향장치를 이용한 비대칭 마찰노면 제동시 차량자세 제어에 관한 연구
정래욱(Raewook Chung),성우제(Wooje Sung),성현(Hyun Sung) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Active front steering system(AFS) is able not only to vary steering ratio between steering wheel and tire but also to steer front tires independently. This paper describes possibilities of stability control in split-μ braking using AFS system. The performance of stability control is verified using simulation and HILS test.
신현수(Hyunsoo Shin),김창준(Changjun Kim),배진(Jin Bae),한창수(Changsoo Han) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Active Front Steering (AFS) system enable vehicle performance to improve directional stability control and driver convenience. this AFS system is a complementary system for a front-steered vehicle that adds at lower speed or subtracts at higher speed based on vehicle information. Such as steering wheel angle, vehicle speed, lateral acceleration, yaw rate and road conditions. In this paper several mechanisms are studied which are realized in these AFS functions. Planetary gear system, Harmonic drive system and Link system are commonly known AFS mechanisms. And characteristic of each mechanism is referred in AFS functions.
ESC, AFS와 AGCS를 이용한 샤시 통합제어시스템 설계
윤경준(Kyoungjun Yoon),이재천(Jaecheon Lee),이규훈(Kyuhoon Lee),황태훈(Taehun Hwang),박기홍(Kihong Park),허승진(Seung-Jin Heo) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The active chassis control systems have been developed with vehicle electronic technology by achieving operating convenience and guaranteeing the stability of the vehicle. However, each controller has been optimized to meet its object according as developing each controller. In this paper, two integrated control logics - one that integrates Electronic Stability Control and Active Geometry Control Suspension and the other that integrates Electronic Stability Control and Active Front Steering - have been developed. The main control target of both logics is vehicle dynamics control under critical situations. The two logics were tested under various driving conditions in a reliable simulation environment and their synergetic effects were investigated. The results indicate that the proposed logics can yield better vehicle performance than the cases when the individual chassis control modules work without any integration scheme.
유성기어형 능동 전륜 조향 시스템을 이용한 조종성과 안정성 향상을 위한 제어알고리즘 개발
신현수(Hyunsoo Shin),김창준(Changjun Kim),미안아쉬팍알리(Mian Ashfaq Ali),한창수(Changsoo Han),오승규(Seungkyu Oh),장진희(Jinhee Jang) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Active Front Steering (AFS) system enables vehicle performance to improve directional stability control and driver convenience. AFS system is a complementary system for a front-steered vehicle that adds compensation angle at lower speed or subtracts at higher speed based on vehicle information and performance such as steering wheel angle, vehicle speed, lateral acceleration, yaw rate and road conditions. In this paper, planetary gear type AFS module modeling is used Bond graph method. Variable Gear Ratio(VGR) algorithm is considered vehicle speed and steering wheel angle for driver’s convenience. Active steering is proposed to improve vehicle yaw stability which use PID controller.
김성주(Seongjoo Kim),진종학(Jonghak Jin),정성준(Sungjune Chung),표종현(Jonghyun Pyo),송준규(Jungyu Song) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Active Front Steering enhances vehicle performance by making optimal road wheel angle based on vehicle state information. This information includes steering wheel angle, vehicle speed, lateral acceleration and yaw rate. To generate optimized road wheel angle under various vehicle maneuver, several mechanisms are studied and developed by steering suppliers in the world and these mechanisms are commercialized by car makers. Linkage mechanism, harmonic gear, planetary gears are widely referred mechanism. Among them planetary mechanism is most commonly known actuator. In this paper planetary gear system is analyzed using dynamic simulation model and requirement in choosing appropriate electric motor is described.
송정훈(Jeonghoon Song) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.6
A numerical model and a controller of Active Front wheel Steer (AFS) system are designed in this study. The AFS model consists of four sub models, and the AFS controller uses sliding mode control and PID control methods. To test this model and controller an Integrated Dynamics Control with Steering (IDCS) system is also designed. The IDCS system integrates an AFS system and an ARS (Active Rear wheel Steering) system. The AFS controller and IDCS controller are compared under several driving and road conditions. An 8 degree of freedom vehicle model is also employed to test the controllers. The results show that the model of AFS system shows good kinematic steering assistance function. Steering ratio varies depends on vehicle velocity between 12 and 24. Kinematic stabilization function also shows good performance because yaw rate of AFS vehicle tracks the reference yaw rate. IDCS shows improved responses compared to AFS because body side slip angle is also reduced. This result also proves that AFS system shows satisfactory result when it is integrated with another chassis system. On a split-m road, two controllers forced the vehicle to proceed straight ahead.
3D 가변 조향 비 맵을 이용한 AFS와 ESC 통합 제어기의 설계
조정민(Jeongmin Cho),박장희(Janghee Park),김승기(Seungki Kim),허건수(Kunsoo Huh) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
The purpose of this study is to design an UCC(Unified Chassis Controller) composed of AFS(Active Front Steering), which is based on 3D VSR(Variable Steering Ratio) map, and ESC(Electronic Stability Control). AFS and ESC control the yaw motion and side-slip angle of vehicle to improve steering performance and driving stability. The proposed 3D VSR map is made up with longitudinal velocity and steering angle considering the yaw rate gain and steering sensitivity. The gear ratio decreases to relieve a burden of drivers and increases to improve maneuver stability at low and high speed, respectively. In addition, the purposed VSR map takes account of steering angle to cope with emergency. Desired yaw rate is calculated from bicycle model and tracked by model predictive control(MPC). The proposed algorithm is validated by using the computer simulation software, CarSim and MATLAB/Simulink.
통합 사륜 조향장치의 차량 핸들링 특성에 대한 실험적 고찰
모재현(Jaehyun Mo),장재훈(Jaehoon Jang) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
In order to improve the handling performance of the vehicle, 4WS (4 wheel steer) started in Japan in the 1960s and has been developed to the active 4WS of today. From the 80s until now it has been applied to a relatively small number of production cars. The rear wheels of common 2WS car generate lateral acceleration from yaw angle which is caused by front steer, but the 4WS vehicle"s steer angle and lateral force of rear wheels can be adjusted. In addition, even if the driver"s steering angle is constant, it could adjust front steer angle of front wheels by varying front steering ratio. In recent, there are some 4WS cars encouraging yaw rate to follow the reference yaw rate by adjusting the rear wheel steering angle. 4WS system is integrated active steering system leading lots of advantages such as high-speed stability and rapid lateral acceleration response, low speed and reduced turning radius by using steering variables. There are many studies on handling characteristic advantages about integrated 4WS when it applies to vehicle actually. However, studies on boundary maximizing the handling characteristic when driver feels in practice are lacking. In this study, research about vehicle handling characteristics equipped with 4WS and when driver could feel stability, what range could be analyzed to maximize it, what types of vehicles are efficient to apply 4WS are proposed.