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[Special Edition/Steering and Suspension System]신개념의 승용차 서스펜션 기술
이언구(Unkoo Lee) 한국자동차공학회 2003 오토저널 Vol.25 No.1
최근 21C를 맞이하여 자동차의 기술발전은 급격한 증가세를 이루고 있다. 그러나 되돌아보면 현재의 자동차의 성능을 극대화시키기 위한 많은 설계이론 및 신기술 등의 개발은 아직도 기존의 개념을 답습한 상태에서 방법론쪽인 측면에서만 주로 개선을 거듭하고 있다고 할 수 있겠다. 그러나, 이러한 형태의 개선과 발전은 이미 상당한 연구개발에도 불구하고 그다지 효율적이지 못하여 어느 정도 한계에 이른 것이 아닌가 판단되어 진다. 따라서 서스펜션 기술이 더욱 혁신적으로 향상되기 위해서는 기본개념부터 대폭 개선시켜 나가야 할 것이고 그 시점은 바로 지금이 아닌가 생각된다. <br/> 또한 혹자는 ‘차량의 서스펜션 기술이 이제는 대충 거의 발전할 만큼 발전해서 앞으로는 원가절감 및 경량화 그리고 품질개선 등에 초점을 맞추면 될 것이다’라고 말하기도 한다. 그러나, 실제로 수준 높은 고객들의 더 고차원적인 성능에 대한 욕구와 더불어 더욱더 완벽한 설계를 위한 설계이론의 필요성에 의해 아직도 연구개발 되어야 할 여지는 무한하다고 할 수 있다.<br/> 따라서 본 논문에서는 이러한 측면에서 앞으로 서스펜션 기술이 발전해야 할 방향을 가늠해 보고 그 중에서도 가장 현실적이고도 필히 지향해야 할 기술개발의 방향에 대해서 대표적인 몇가지 기술사례 형식으로 언급해봄으로써 관련 연구자들에게 연구방향을 제시해 보고자 한다.<br/>
Development of Integrated Chassis Control Algorithms to Improve Vehicle Dynamics
Taehun Hwang(황태훈),Kihong Park(박기홍),Seung-Jin Heo(허승진),Ji Yoel Joeng(정지열),Sangho Lee(이상호),Unkoo Lee(이언구),Kyu Hoon Lee(이규훈),Seung Guan Kee(기승관),Kangwon Lee(이강원) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Most electronic chassis control systems so far have been designed for optimization of its own performance. This, sometimes, has resulted in performance degradation when two or more control modules were operating together. Recently. great R&D effort is being given to judicious integration of individual chassis control systems in an effort to further enhance the overall vehicle performance. In this paper, two integrated control logics - one that integrates the brake and suspension control systems and the other that integrates the brake and steering control systems - 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.
이상호(Sangho Lee),성현(Hyun Sung),김정원(Jungwon Kim),오영호(Youngho Oh),이언구(Unkoo Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents the investigation on the improvement of the SUV rollover performance by the AGCS system. The AGCS system actively controls the suspension link mounting point of the body to increase the rear bump toe-in angle during hign-speed turning maneuvers. The effect of the AGCS is remarkable to enhance a handling performance in high-speed cornering by adjusting rear bump toe-in angle and especially a rollover performance of the SUV. In this paper, the AGCS control scheme has been developed. The vehicle with the AGCS system is compared with the vehicle without the AGCS through the fishhook test. The test is passed if front and rear wheel lift doesn't occur at the same time. The fishhook test results show that the vehicle has a good rollover performance with the AGCS system connected.
차량 안정성 향상을 위한 샤시 통합 제어 시스템 제어로직 개발
이상호(Sangho Lee),안창선(Changsun Ahn),정지열(Ji Yoel Joeng),오영호(Young Ho Oh),이언구(Unkoo Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Most electronic chassis control systems, such as ESC, CDC, AGCS or MDPS have been designed to improve each own performance. Recently, however, many researches are focused on maximizing vehicle overall stability and performance by integration of individual system. In this paper, the architecture and integration strategies of the integrated chassis control system are introduced, and the result of simulation is presented.
박수보(Soobo Park),오영호(Youngho Oh),이언구(Unkoo Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Steer by wire (SBW) system is a prospective new chassis technology which eliminates mechanical linkages between steering wheel and steering gearbox. SBW system steers a vehicle by using actuators which receive vehicle information from sensors. This paper proposes an Independent-type steer by wire system which has two steering actuators in RH and LH so that the steered angle of front tires can be controlled by ECU independently. The Independent-type SBW system has merits over the conventional SBW system in that it highly enhances system safety and can realize ideal handling performance by controlling right and left wheels independently. The procedure of developing the Independent-type SBW is followed below: a HILS (Hardware-In-the-Loop Simulation) system and validating the system, Designing the layout of system to tit a vehicle with the Independent-type SBW, and analyzing the system layout, describing a manufacturing and testing vehicle equipped with the Independent-type SBW system, and finally laying the future works open based on the test results.