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SI 기관에서 초기 화염의 생성 및 성장에 대한 모델링
송정훈,선우명호,Song, Jeonghoon,Sunwoo, Myoungho 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.2
In spark ignited engines, the electrical spark not only sets the time for the onset of combustion but also is able to greatly influence the character of the initial flame growth and the subsequent combustion, and thereby can influence engine performance. The relative importance of the ignition energy is particularly high under lean or high residual gas or exhaust gas recirculation (EGR). In this study, a modeling of flame Initiation and its development is proposed. Submodels consist in representing of cylinder pressure and temperature, heat transfer to cylinder wall, and flame kernel heat transfer to ambient air and to spark plug electrodes. The breakdown process and the subsequent electrical power input initially control the kernel growth while intermediate growth is mainly dominated by diffusion or conduction. Then, the flame propagates by the chemical energy, and laminar and turbulent flame velocity.
주행 안정성 및 조향 성능의 개선을 위한 SUV 차량의 통합운동제어장치의 개발
송정훈(Jeonghoon Song) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.12
In this study, two Integrated Dynamics Control systems are developed to improve the lateral stability and the steerability. They are FSFB(Front Steering Front Braking) and FSRB(Front Steering Rear Braking). FSFB is integrated with the front steering system and the front braking system, and FSRB controls the front steering system and the rear braking system simultaneously. The performance is compared with IDCB (Integrated Dynamics Control with Brake system) and evaluated with various steering input and road conditions. The result shows that two controllers reduce the yaw rate error and the side slip angle on every driving condition with the small deceleration. They also extend the limit of adhesion between the tire and the road. It also represents that the comfort, the lateral stability and the steerability are improved. The brake pressure and the additional steering angle of two controllers are different a little according to the driving condition but performances of SUVs are similar.
전륜 제동력 및 전륜 조향각을 이용한 SUV 차량의 통합운동제어시스템 개발
송정훈(Jeonghoon Song) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.5
An integrated front steering system and front brake system (FSFB) is developed to improve the stability and controllability of an SUV. The FSFB simultaneously controls the additional steering angle and front brake pressure. An active front steering system (AFS) and an active front brake system (AFB) are designed for comparison. The results show that the FSFB enhances the lateral stability and controllability regardless of road and running conditions compared to the AFS and AFB. As a result, the yaw rate of the SUV tracks the reference yaw rate, and the side slip angle decreases. In addition, brake pressure control is more effective than steering angle control in improving the stability and steerability of the SUV on a slippery road. However, this deteriorates comfort on dry or wet asphalt.
Development of Integrated Dynamics Control System of SUV Vehicle with Front and Rear Steering System
Jeonghoon Song(송정훈) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.6
In order to improve stability and controllability of SUV vehicle, Integrated Dynamics Control system with Steering system (IDCS) was developed. Eight degree of freedom vehicle model and front and rear steering system model were used to design IDCS system. It also employs Fuzzy logic control method to design integrate control system. The performance of IDCS was evaluated with two road conditions and several driving conditions. The result shows that SUV vehicle with IDCS tracked the reference yaw rate under all tested conditions. IDCS reduced the body slip angle also. It represents IDCS improves vehicle stability and steerability.