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인휠 독립구동 차량에 대한 노면 마찰계수 추정 및 TCS 제어 알고리즘 개발
고성연(Sungyeon Ko),고지원(Jiwon Ko),김정욱(Jungwook Kim),이상문(Sangmoon Lee),천재승(Jaeseung Cheon),김현수(Hyunsoo Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
In this study, a road friction estimation and TCS control algorithms were proposed for an in-wheel electric vehicle. Road friction estimation algorithm estimates the road friction when the vehicle is running on a slippery road based on the vehicle dynamics and sensor measurements. Furthermore, the proposed method does not used tire characteristic map, so it is robust for change of tire at real vehicle. TCS control algorithm controls each of wheels using in-wheel motor when the vehicle slip on a slippery road. As a result, the vehicle is running on a slippery road safely by using TCS control algorithm. To validate of the proposed road friction estimation and TCS control algorithm, a co-simulator was developed, which combined the vehicle performance simulator based on MATLAB/Simulink and the vehicle model of CarSim.
조치훈(Chihoon Jo),김종성(Jongsung Kim),손미진(Mijin Son),천재승(Jaeseung Cheon),최혁수(Hyeoksoo Choi),전성용(Sungyong Jeon) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
An electronic wedge brake (EWB) uses the wedge principle to provide a self-reinforcement mechanism, resulting in reduced power to the actuation motor. However, EWB needs mechanical device for adjust of pad wear, even if EWB need a extra equipment in order to compensate adjust of pad wear, and it has disadvantage that braking force can not be occurred and controled if CAN or supplied power are disconnected. The hEWB has fast response and mechanical backup using wedge mechanism and hydraulic system when the hEWB is failed. In this study, hEWB with a proposed structure is designed and developed and the braking performance of the proposed hEWB was verified using test rig and vehicle testing.
Optimal design of pedal feel simulator
Yong sik Kwon(권용식),Chang hoe Koo(구창희),Jongsung Kim(김종성),Jaeseung Cheon(천재승) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The electric wedge brake (EWB) is an electro-mechanical brake actuator that shows promise for application in future brake by wire systems. Due to the system properties it has special pedal system that supplies proper pedal feel in terms of user actuating forces. The Pedal feel generally considers critical issues which cause various user complaints with respect to car manufacturing company. However, realizing proper pedal feel is fussy task according to the increasing system complexity. In this study, an optimal design approach was applied to the design of the pedal simulator to adapt target pedal feel proposed mass-produced car. More specifically, 3-step design concept with try and error fixing mechanism was used to find a proper solution that meets the goals of target data set. For the target system, the objective functions were defined as pedal effort and pedal force ratio which obtained the mounted sensors.
HILS Test Bench를 이용한 전자브레이크(EMB)의 센서 Fault Injection Test 및 동역학 해석 검증
박지인(Ji in Park),전광기(Kawngki Jeon),최성진(Sungjin Choi),기영훈(Younghoon Ki),안현식(Hyunsik Ahn),김태연(Teayoun Kim),권용식(Yongsik Kwon),천재승(Jaeseung Cheon) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
In recent, the eco-friendly Green cars such as Hybrid-Electronic vehicles, Fuel Cell vehicles and Electronic vehicles have been researched in major car makers. To response this electronic vehicle, the electronic brake systems such as EMB(Electro-Mechanical Brake) are receiving a lot of interest in automotive industry due to their flexibility in controlling vehicle motion. So the establishments of assessment technology for performance and reliability of electronic brake are needed because of ISO 26262. In this study, the evaluation method of fault injection test for sensor fault using test bench are introduced. And vehicle dynamic simulation also conducted using brake torque measured in fault injection test. The purpose of the simulation is to verify the effect of fault-tolerant algorithm on vehicle stability.