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장인섭(Inseob Jang),김현섭(Hyunsup Kim),이형철(Hyeongchul Lee),신동우(Dongwoo Shin) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper proposes height control and failsafe logic for a closed loop four wheel air suspension control system. Based on understanding and researching existing air suspension system, we develop new control algorithm and method. We analyze the air suspension system and classify six modes according to vehicle height. The system inputs consist of vehicle conditions and driver's commands, such as the vehicle speed, the vehicle heights, the steering angle, a mode select switch input and etc. The logic determines target height from input signals and controls actuators such as a compressor, two reversing valves, and four air spring valves. First, the main logic determines target vehicle height and detects the faults of the various parts through the target mode decision logic and the fault detection logic. On results of this logic, it is performed for the target height correction logic, the failsafe logic and determining actuators commands. Finally the vehicle engages to target height. The control logic is developed by model based design method and constructed the simulation environment using Matlab/Simulink and CarSim. To verify suggested control and failsafe logic, simulations are conducted under the reasonable condition.
공기 현가장치를 장착한 화물차량의 진동측정 및 한국형 공기 현가장치 모듈 개발
우준성(Woo, Jun-Seong),전용호(Jeon, Yong-Ho),정성필(Jung, Sung-Pil),박태원(Park, Tae-Won),권순기(Kwon, Soon-Ki) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.12
A leaf spring suspension has been widely used since it can carry big load and its simplicity. But one major drawback is the poor ride performance because of the friction in the system and the high stiffness coefficient. To overcome these, an air spring suspension can be used. The air spring suspension system can improve the ride of the heavy vehicle significantly and also it can adjust the height to the loading and unloading. The road tests for the truck with the leaf spring suspension and air spring suspension are performed to compare the ride quality of the two systems. To develop the air spring suspension system tailored to the target truck, chassis development procedure using CAE has been applied.
Rubber Tube의 고무 및 코드지에 따른 Air Suspension 성능에 관한 연구
박태원(Taewon Park),김성수(Seongsoo Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, for the automobile ride comfort, more and more air suspensions with rubber tube are applied on automobile suspension system in substitute for the conventional coiled spring type suspension. In this study, the optimum design of rubber and cord materials in rubber tube to improve the performance of air suspensions by using the design of experiment have been studied. To find the optimum design, we altered the fillers and antioxidants in CR (chloroprene rubber) compounds having a good resistance to ozone, and changed the cord angle and thickness of polyamide cord. We produced rubber tubes using the cord reinforced rubber composite materials, and analyzed/measured the physical properties, microstructure, and dimensions. And we evaluated the load capacity, the static and dynamic spring characteristics, outer diameter changes and pressure changes in the loading, and burst pressure of air suspension. Finally, we performed the durability test (3×10? cycles) with air suspension assay and verified the optimal conditions of rubber and cord materials.
전갑진(Kab-Jin Jun),박태원(Tae-Won Park),이수호(Su-Ho Lee),윤지원(Ji-Won Yoon),권순기(Soon-Ki Kwon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The air suspension system is widely used in commercial vehicles such as buses or special purpose trucks because it improves ride better than any other types of suspension. Since the durability of vehicle parts is directly related to the safety, the evaluation of the durability at the design state is necessary. In this research, the fatigue life of the air suspension frame for trucks is predicted by the modal stress recovery(MSR) method. Using the process proposed in this research, the fatigue life of vehicle parts can be predicted efficiently at the design stage.
권혁민,임원식 한국도시철도학회 2022 한국도시철도학회논문집 Vol.10 No.2
Air springs for urban railway vehicles are products that satisfy both type approval and manufacturer approval prescribed by law. However, the airbag folding phenomenon occurred on the train of Seoul Metro Line 2. In this paper, we tried to find the test conditions under which the same phenomenon occurs for the air spring product of Line 2. The same phenomenon was reproduced in the lateral displacement test that was not included in the railway vehicle technical standards. By applying this, we tried to present additional criteria for determining the phenomenon of air spring folding. 도시철도 차량용 공기스프링은「철도차량 기술기준」의 제정 이후 법에서 정하는 형식승인 및 제작자 승인을 모두 만족시킨 제품이다. 그러나 서울교통공사 2호선 전동차 200편성 총 800개의 공기스프링 중 약 95% 이상에서 에어백 접힘 현상이 발생 되었다. 본 논문에서는 기술기준 통과 후 양산되고도 접힘현상이 발생된 2호선 전동차 공기스프링 제품에 대하여 동일 현상이 발생되는 시험 조건을 찾고자 하였고 철도차량기술기준에는 포함되어 있지 않은 횡변위 시험에서 동일한 현상을 재현해내었다. 이를 적용하여 공기스프링 접힘현상 발생 여부를 판단하는 추가기준을 제시하고자 하였다.
전병호(Byoung-Ho Jun),김병곤(Byung-Gon Kim),사공준(Joon Sakong),한영섭(Young-Sup Han),이병상(Byoung-Sang Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
기존의 코일 스프링과 일반 댐퍼를 적용한 차량은 차량 하중의 증감에 따라서 차고의 변동이 발생하며, 노면 또는 주행조건과 상관없는 일정한 감쇄력을 가지므로 핸들링과 승차감을 동시에 만족시키기 어렵다. 본 논문에서 다루는 공기현가장치 ECU는 차고 제어와 감쇄력 제어의 통합환경으로 구성되며, 에어스프링과 가변 댐퍼를 동시에 제어함으로써, 차량의 하중 조건과 주행조건에 따른 최적의 차고를 유지시키고 주행조건에 따른 감쇄력을 조절을 통해 조종안정성 및 승차감을 향상 시키기 위해 개발되었다. 본 논문은 현대모비스가 개발한 공기현가장치 ECU의 동작원리, 설계, 검증 및 시험에 관하여 설명한다.
하동길(Donggil Ha),김현섭(Hyunsup Kim),이형철(Hyeongcheol Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Height sensor is used in many vehicle suspension system.. This paper presents a method to diagnose height sensor fault for Electronic Air Suspension System. This approach is assuming that height sensors are attached at 4 corners of vehicle body and a sensor fault occurs at one of 4 height sensor. In this paper, fault detection performed only with height sensors and fault isolation with the roll angle and pitch angle which might be estimated using other sensors such as acceleration sensor. yaw rate sensor, wheel speed sensor. The fault detection and isolation method proposed in this paper are verified by the simulation.
대형 트럭 캐빈 공기 현가장치의 유공압 모델링 및 해석
신행우(Hangwoo Shin),최규재(Gyoojae Choi),이광헌(Kwangheon Lee),고한영(Hanyoung Ko),조길준(Giljoon Cho) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.4
In this paper, a hydropneumatic modeling and analysis of a heavy truck cabin air suspension system is presented. Cabin air suspension system is a system which improves ride comfort of a heavy truck and it can reduce vibration between truck frame and cabin. The components of the system, air spring, shock absorber, leveling valve and full cabin system are mathematically modelled using AMESim software. Simulation results of components and full cabin system are compared with experimental data of components and test results of a cabin using 6 axis simulation table. It is found that the simulation results are in good agreements with test results, and the hydropneumatic model can be used well to predict dynamic characteric of heavy truck cabin air suspension system.
자동 코드 생성을 이용한 전자 제어식 공기현가 시스템 소프트웨어 개발
김현섭(Hyunsup Kim),하동길(Donggil Ha),황윤권(Yoonkwon Hwang),이형철(Hyeongcheol Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In this paper, an optimized c code is developed by an automatic code generation method for an electronically controlled air suspension system. The MATLAB/Simulink, the standard simulation tools from the MathWorks, is used to develop control algorithm. And the dSPACE’s TargetLink is used to convert the developed control algorithm into an optimized c code. At first, the electronically controlled air suspension system and the control algorithm is introduced and then the process to develop the c code using the TargetLink is described. After that, the produced c code is verified by the three simulation modes, MIL(Model-in-the-loop), SIL (Software-in-the-loop), PIL (Processor-in-the-loop). At last, the test results of the c code through the real vehicle test are represented and analysed.