http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
위효성(Hyoseong Wi),조근진(Geunjin Jo),박진일(Jinil Park),박경석(Kyoungseok Park),이종화(Jonghwa Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper focuses on fuel economy improvement according to types of power steering system. Usually, conventional power steering system is directly driven by the crankshaft of engine with belt. But there's some inefficiency in high engine speed range. To improve this inefficiency automobile makers develops new power steering systems, a motor driven hydraulic power steering system and a full electric power steering system. However there's insufficient study about effects of type of power steering system on fuel economy. In this paper, researches are performed on effect of type of power steering system on fuel economy by experiment. And it is also calculated the effect on vehicle fuel economy using computer simulation with AVL cruise software. As a result, 1% of vehicle fuel economy improvement can be achieved in a vehicle with motor driven hydraulic power steering system compared to a vehicle with conventional power steering system. In addition 1.7% of vehicle fuel economy improvement can be achieved using full electric power steering system in LA-4 mode. These results could be used to choose a power steering system on the focus of interest.
파워스티어링 호스의 필드고장 재현을 통한 누유경로 파악
박종원(J. W. Park),이기천(G. C. Lee),김형의(H. E. Kim),임영한(Y. H. Lim),이종황(J. H. Lee),정원욱(W. W. Jeong) 유공압건설기계학회 2009 유공압건설기계학회 학술대회논문집 Vol.2009 No.11
Generally, a leakage in a high pressure hose assembly can be determined if hydraulic fluid falls down through fitting which is swaged with a rubber hose. This study tried to visualize leakage, which is considered a failure occurring often in the hydraulic system. In the case of methods which verify leakage paths in the power steering hydraulic system equipped with a high pressure hose assembly, three types of leakage paths, which could be seen by cutting the swaging part, were generally found. However, it was difficult to find out leakage paths by using power steering oil. In this study, four methods, including the thermal burn image method, the hole drilling method of fitting metal, the white paint infiltration method, and the fluorescent infiltration method, were tried to introduce. Reappearance test methods in the high pressure hose assembly, which include a hole drilling, a white paint infiltration, and a fluorescent infiltration method, can be applied to find the failure mode and to approve the test before the mass production of the high pressure hose. Finally, we found the leakage path of the power steering hose by the fluorescent infiltration method and that can be useful to modify and old system.
파워스티어링계 진동 해석을 통한 맥동 소음과의 연관성 규명
이유엽 한국기계기술학회 2017 한국기계기술학회지 Vol.19 No.6
In commercial vehicles. the pulsation noise when the power steering operating is the major item to make the complain for users. If this noise have related to vibration characteristics in steering system's parts or assembly, it makes the problem in vehicle quality. Recently, the users demand the high quality in commercial vehicles, and we must identified the relevance between the pulsation noise and the vibration characteristics. After the identification, we can design the power steering system for satisfaction the user’s needs. Finally, the identification of relevance in pulsation noise for analysing the vibration characteristics will be suggested advanced power steering system.
로드휠의 슬립을 고려한 궤도차량의 평면운동에 관한 연구
윤재섭(Jaeseop Yoon),오덕수(Ducksoo Oh),임원식(WonSik Lim),강상욱(Sangwook Kang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Steering mechanism of a tracked vehicle is quite different from that of a wheeled vehicle. A separate treatment of the steering of tracked vehicles is therefore required. A number of methods that can accomplish the steering of a tracked vehicle are skid-steering, articulated steering, and curved track steering. Among these, skid-steering is the most widely used method for steering tracked vehicles. Skid-steering is a complex phenomenon that involves the dynamics of a moving vehicle, track, and the properties of soil. In this study, A practical model that includes track slippage, inertia force and moment is presented to analyze and predict steering dynamics and steerability.
이유엽 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.6
There are many causes of interior noise in commercial vehicles. The one of them is power steering noise and this study try to reduce the power steering noise by theoretical consideration. The interior noise was tested for the real truck and analysed the frequency. For reducing the interior noise, the spiral tube was adapted and modified the structure in the steering system. The spiral tube system was analysed and made the formula to calculate the reducing frequency. And the effective frequency for reducing the interior noise was calculated by changing the length of tube. Finally, we found the possibility between thoeretical results and real interior noise by comparing the frequency results. The second, the experimental consideration will be worked in power steering system. Finally, the optimal design result will be suggested for reduce the noise.
Active Front Steering을 이용한 차량 거동 안정성 향상에 관한 연구
노태봉(Taebong Noh),정성준(Sungjune Chung),김재구(Jaegoo Kim),최정락(Jungrak Choi),송준규(Jungyu Song) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently steering technology focuses on not only driver뭩convenience, fuel efficiency, environment friendliness but also improved vehicle stability. However EPS(Electric Power Steering) basically has constant steering ratio therefore it has a limitation to control vehicle stability. Meanwhile SBW(Steer-by-Wire) system could have all of the advantages of EPS and control vehicle behavior with better controllability, but SBW can not reach to mass-production due to reliability in case of failures, high cost for the complicated fault tolerant means and a legal restriction that steering wheel must be mechanically linked to the front wheel. Therefore AFS(Active Front Steering) has been widely studied in the automotive industry, which can provide variable gear ratio and improved vehicle stability.
MDPS 로직 파라미터에 따른 스티어링 성능 영향도의 실험적 연구
이동원(Dong Won Lee),한상호(Sang Ho Han),천세원(Se Won Cheon),오원진(Won Jin Oh) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Motor Driven Power Steering which is broadly used in vehicle industry has a lot of advantages and tuning potential. To define the effect of tuning parameters on steering performance, subjective and objective evaluations were performed. As a result, the relationship and the tuning direction of each parameter were obtained. In addition, desirable steering performance was discussed with reference vehicles. With the result of parameter study, the logic tuning was performed and the steering performance of tuning vehicle was successfully closed to target vehicles. A further study will be needed to enhance the relationship between steering performance and mechanical characteristics of MDPS system.
목표 조타토크 맵 기반 랙반력 피드백 MDPS 제어로직 개발
장세현(Sehyun Chang),이병림(Byung Rim Lee),박영대(Young Dae Park),조현석(Hyun Seok Jo),김민준(Minjun Kim),장봉춘(Bongchoon Jang),이동필(Dongpil Lee) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
This paper proposes new rack force feedback control logic of a motor driven power steering (MDPS). The proposed control logic consists of a 3 dimensional map of target steering torque and control logic for target torque following. The 3 dimensional map of steering torque is defined by using target steering torque vs. steering angle curves of weave and transition tests. This 3 D map of steering torque provides control logic with target steering torque according to steering angle and angular velocity inputs. Then adaptive sliding mode control (ASMC) determines steering assist torque in order to achieve the target steering torque. ASMC is designed by considering rack force, steering system friction, and uncertainty of a steering system to reach a sliding surface which is defined by combining target torque tracking error and its integral. Simulation study is used to investigate the performance of the proposed control first, and then Hardware-in-the-Loop Simulation(HILS) is utilized in order to evaluate its performance in a real steering system. It shows that the proposed control logic can achieve excellently the target steering torque with respect to on-center steering tests.
김성주(Seongjoo Kim),표종현(Jonghyun Pyo),김성규(SeongKyu Kim),탁일환(IlHwan Tak) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Good road feel means that the driver can interpret road conditions through the steering wheel. This is one of the most important requirements demanded by car makers. However, over-sensitivity in steering transmission could cause inconvenience to the driver especially maneuvering on rough road and hence must be isolated by the steering system or by other means. Driver has better steering feel if steering system can distinguish diverse road conditions and apply appropriate control strategy. In this paper we’ve proposed two control strategies to enhance steering performance especially on rough roads. The first method analyzes motor position signal of Electric Power Steering (or EPS) which the road roughness can be separated from the motor position signal using signal processing .Then the roughness is compensated to obtain better steering feel. The second method utilizes CAN transferred vehicle information from Continuous Damping Control system (or CDC). CDC sets damping force in accordance with driving condition and road roughness. The roughness of the road can be detected using vertical acceleration sensors located at each front wheel. The shift control algorithm method shows better performance especially on rough road. These two methods were compared on rough road conditions with conventional steering system to show the enhanced steering performance.
정재택(Jae-Tack Jeong),신수식(Soo-Sik Shin),김갑태(Kaptae Kim) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.7
제로터는 유압모터나 펌프뿐만 아니라 조향장치인 파워 스티어링 유닛(PSU)에도 사용된다. 제로터의 내치차는 일상적인 경우 단일 원호형상의 외치차에 의하여 생성된다. 본 논문에서 PSU의 특성 개선을 위하여 보다 일반화 된 외치차의 형상으로부터 내치차를 생성하는 방법을 해석하였다. 해석의 결과로서, 외치차의 형상곡선이 특별한 2중곡률을 갖는 원호인 경우에 대하여, 내치차의 형상과 곡률, 제로터의 유량 및 접촉점의 위치와 슬립속도 등의 설계자료를 구하여 제시하였다. 이러한 해석은 새로운 PSU의 개발과 소형화를 가능케 한다. A gerotor is used in power-steering units (PSUs) as well as in hydraulic motors or pumps. The inner rotor is developed on the basis of the shape of the outer rotor tooth, which normally has one arc. The method of generating inner rotor on the basis of a generalized shape of outer rotor is analyzed with a view to improve PSU characteristics. An arc-shaped outer rotor with two curvatures was used in the analysis; design parameters such as the shape and curvature of the inner rotor, the flow rate of the gerotor, the position of contact point, and slip velocity are calculated, and these results are shown. This analysis enables us to develop a new design of compact PSUs.