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이승종(Seung-Jong Yi) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The purpose of this study is to develop the fuzzy logic RSC (Roll Stability Control) system to prevent the rollover for the SUV (sport utility vehicle). The SUV model used in this study is the 8-DOF model considering the longitudinal, lateral, yaw and roll motions. The longitudinal and transversal weight transfers are considered in the computation of the vertical forces acting on a wheel. The engine torque is obtained from the throttle position and the r.p.m. of the engine map. The fuzzy logic controller input consists of the roll angle error and its derivative. The output is the brake torque and the throttle angle. The engine torque controller controls the throttle valve angle. The brake controller independently controls both right and left wheels. When the roll angle is ±4.5° defined as the critical roll angle, the front inner tire experiences the 1/100~1/50 of the total vertical forces, and the rollover starts. To prevent the rollover in advance, the target angle ±4.5° is adopted to control the vehicle stability. The RSC system begins operating at ±4.5° and stops at 0°. The simulations are conducted to evaluate the controller performance at right turns for the excessive steering angle. The simulation outputs are the roll angle, the lateral acceleration, the yaw rate, the vertical forces acting on the tires and the brake torque. When the roll angle error and its derivative exceed the limited point, the RSC system makes the longitudinal velocity of the SUV decrease the brake torque and adjusts the throttle angle. The roll motion of the SUV is then stabilized.
요소결합을 통한 파워트레인 시뮬레이션 소프트웨어 (Ⅱ)
이승종(Seung-Jong Yi),서정민(Jungmin Seo) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.2
In this paper, the automatic system generation algorithm based on the element combination algorithm discussed in the first part of this paper for designing an arbitrary type of the automatic transmissions is proposed. The powertrain design software using these algorithms is developed. This automotive powertrain design software with user-friendly graphic user interface has two main modules. The first module, the automatic power flow generation module, is already discussed in the previous paper. The second module dealing with the automatic system generation algorithm is discussed in this paper. The power-flow simulation software for the arbitrary type of powertrain is then developed. The simulation and experimental results of the vehicle equipped with two planetary gear type automatic transmission are compared to validate the proposed algorithms and developed software. The simulation results demonstrate the good agreement with the experimental results.
궤도차량 운동학과 유한요소법을 이용한 궤도차량과 토양의 상호관계 해석
박천서(Cheun seo Park),이승종(Seung Jong Yi) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
The planar tracked vehicle model used in this investigation consists of two kinematically decoupled subsystems, i.e., the chassis subsystem and the track subsystem. The chassis subsystem includes the chassis fiame, sprocket, idler and rollers, while the track subsystem is represented as a closed kinematic chain consisting of rigid links interconnected by revolute joints. In this tracked vehicle, the recursive kinematic and dynamic fotmulation is used to fmd the vertical force and the distance of the certain track moved in the driving direction along the track. These distances and vertical forces obtained are used to calculate ale sinkage of a terrain. In this study, the finite element method is adopted to analyze the interaction between a tracked vehicle and the terrain. When the tracked vehicle is moving with different speeds on the terrain, the elastic and plastic deformations and the maximum sinkage for the four different types of a isotropic soil are simulated.