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권성진(Seong-Jin Kwon),Takehiko Fujioka,조기용(Ki-Yong Cho),서명원(Myung-Won Suh) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, AVCS (Advanced Vehicle Control Systems) and AHS (Automated Highway Systems) for ITS (Intelligent Transport Systems) have been rapidly developed. Above all, the autonomous driving system enables a vehicle to be controlled automatically instead of the human driver's operation. However, we still have stability problems under the effect of the disturbances and the perturbations to the control plant model. In this paper, the model-matching control in longitudinal and lateral autonomous driving is investigated by vehicle dynamics simulation. The model-matching controller is constructed with 2 degrees of freedom controller to design the robust characteristics of the control plant model. For this purpose, the vehicle dynamic models including the model-matching controller are constructed for computer simulation. Simple examples are applied to check the validity of the model-matching control. As the practical example, the autonomous driving system is adopted. It is shown that the model-matching control can make the various characteristics of autonomous driving vehicles to be equivalent to those of a specific transfer function which is suggested as the reference model even if the parameters of the control plant model are changed.
ACC 차량의 동특성 해석을 위한 VR 시뮬레이션 시스템 개발
권성진(Seong-Jin Kwon),장석(Suk Jang),윤경환(Kyoung-Han Yoon),서명원(Myung-Won Suh) 한국자동차공학회 2004 한국 자동차공학회논문집 Vol.12 No.4
Nowadays, to analyze the dynamic characteristics of the automotive driving system, the computer simulation linked up with VR(Virtual Reality) technology is treated as the useful method with the improvement of computing ability. In this paper, the VR simulation system has been developed to investigate the driving characteristics of the ASV( Advanced Safety Vehicle) equipped with an ACC( Adaptive Cruise Control) system. For the purpose, VR environment which generates 3D graphic and sound information of the vehicle, the road, the facilities, and the terrain has been organized for the driving reality. Mathematical models of vehicle dynamic analysis including the ACC model have been constructed for computer simulation. The ACC modulates the throttle and brake functions to regulate the vehicle speed so that vehicles could keep proper spacing. Also, the real-time simulation algorithm synchronizes vehicle dynamic simulation with the graphic rendering. With the developed VR simulation system, simple scenarios are applied to analyze the dynamic characteristics. It is shown that the VR simulation system could be useful to evaluate the adaptive cruise controlled vehicle on various driving conditions.
실험계획법에 기반한 브레이크 스퀼 노이즈 저감을 위한 강건 설계
권성진,김문성,이봉현,이동원,배철용,김찬중,Kwon, Seong-Jin,Kim, Mun-Sung,Lee, Bong-Hyun,Lee, Dong-Won,Bae, Chul-Yong,Kim, Chan-Jung 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.2
Although there has been substantial research on the squeal noise for the automotive brake system, robust design issues with respect to control factors equivalent to design variables in optimization, noise factors due to system uncertainties, and signal factors designed to accommodate a user-adjustable setting still need to be addressed. For the purpose, the robust design applied to the disk brake system has been investigated by DOE (Design of Experiments) based Taguchi analysis with dynamic characteristics. The specific goal of this methodology is to identify a design with linear signal-response relationship, and variability minimization. The finite element models of the disk brake assembly have been constructed, and the squeal noise problems have been solved by complex eigenvalue analysis. As the practical robust design to reduce the brake squeal noise, material properties of pad, disk, and backplate, thickness and geometry of pad are selected as control factors, material properties of pad and disk, and the contact stiffness have been considered as noise factors, and friction coefficient between pad and disk is chosen as a signal factor. Through the DOE based robust design, the signal-to-noise ratio and the sensitivity for each orthogonal array experiment have been analyzed. Also, it has been proved that the proposed robust design is effective and adequate to reduce the brake squeal noise.
타이어 특성인자에 따른 차량 전복 동특성 해석에 관한 연구
권성진(Seong-Jin Kwon),김찬중(Chan-Jung Kim),배철용(Chul-Yong Bae),이봉현(Bong-Hyun Lee),구태윤(Tae-Yun Koo),조춘택(Choon-Tack Cho) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Single vehicle accidents sometimes lead to vehicle rollover. Rollover is defined as a vehicle rotation of 90 degree or more around its longitudinal axis. In this paper, the multi-body vehicle dynamic model has been constructed to investigate vehicle rollover propensity. The vehicle dynamic model consisted of body, suspension, steering, power-train, brake, tire, road, and driver subsystems. The whole vehicle parameters, each vehicle's part parameter, part connecting elements such as spring, damper and bush, and tire characteristic factors were measured by an experiment to accomplish accurate rollover analysis. With the developed vehicle dynamic model, rollover characteristic analysis due to tire characteristic factors, such as cornering stiffness and cornering force peak has been carried out.
권성진(Seong-Jin Kwon),전지훈(Jee-Hoon Chun),구태윤(Tae-Yun Koo),조기용(Ki-Yong Cho),서명원(Myun-Won Suh) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
The main system function of the FVCWS (Forward Vehicle Collision Warning System) is to warn the driver when the following vehicle encounters the situation when a leading vehicle in the following vehicle's trajectory becomes a potential hazard. Much research on the warning algorithms for the FVCWS has been carried out. However, human factors to design the warning algorithms for the FVCWS must be considered to decide the suitable warning critical distance. In this study, the driver's perception response experiment is carried out on the VR (Virtual Reality) based vehicle simulator. The experimental results against driver's perception response time and the maximum vehicle deceleration corresponding to leading vehicle's sudden braking are reflected to the forward vehicle collision warning algorithm which decides the warning critical distance. It can be useful in the design of the FVCWS with due regard to human factors such as driver's behavior and driving characteristics on various driving conditions.
차량 롤 주행안정성 향상을 위한 RSC (Roll Stability Control) 성능 해석에 관한 연구
권성진,Kwon, Seong-Jin 대한임베디드공학회 2022 대한임베디드공학회논문지 Vol.17 No.5
Active stabilizers use signals such as steering angle, yaw rate, and lateral acceleration to vary the roll stiffness of the front and rear suspension depending on the vehicle's driving conditions, and are attracting attention as RSC (Roll Stability Control) system that suppresses roll when turning and improves ride comfort when going straight. Various studies have been conducted in relation to active stabilizer bars and RSC systems. However, accurate modeling of passive stabilizer model and active stabilizer model and vehicle dynamics analysis result verification are insufficient, and performance result analysis related to vehicle roll angle estimation and electric motor control is insufficient. Therefore, in this study, an accurate vehicle dynamics model was constructed by measuring the passive/active stabilizer bar model and component parameters. Based on this, the analysis result with high reliability was derived by comparing the roll angle estimation algorithm based on the lateral acceleration and suspension of the vehicle with the actual vehicle driving test result. In addition, it was intended to accurately analyze the motor torque characteristics and roll reduction effects of the electric motor-driven RSC system.