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타이어 특성을 고려한 e-4WD 시스템의 최적 토크 분배 전략
나호용(Hoyong Na),황성호(Sung-Ho Hwang),유승한(Seung-Han You) 한국자동차공학회 2020 한국자동차공학회 지부 학술대회 논문집 Vol.2020 No.6
This study proposes an algorithm to distribute drive/braking torque to front/rear motors to optimize energy consumption. The target vehicle is a dual motor driven EV with two motors on the front/rear axles. The optimum distribution ratio for the front torque is calculated using a pre-calculated 2D-Map optimized offline with inputs including the longitudinal vehicle velocity and required torque. The inverse tire map, which is a main consideration, and the motor specifications (motor efficiency map, motor torque map) are utilized to obtain the optimized torque distribution map. The cost function for the optimization consists of front/rear motor efficiency, motor rpm, and motor torque. The proposed method is validated by conducting efficiency comparisons with an average distribution strategy and the algorithm. The results indicate that the proposed method shows better performance than the average distribution method.
토크 컨버터 영향을 고려한 변속 맵 결정 방법에 관한 연구
이현섭(Hyunsub Lee),신창우(Changwoo Shin),임원식(Wonsik Lim),차석원(Sukwon Cha) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Shift-scheduling has been developed by vehicle speed, throttle valve opening. It was supposed to be revised manually. It takes much time to do for engineers of an automotive industry. In addition, power-train components such as engine, transmission should be considered to create shifting pattern. It is important to consider characteristics of torque converter fluid. In this study, shifting schedules were selected from an engine map and a turbine map. Engine map is able to be converted to turbine map considering capacity factors of torque converter. This study is dealing with some different things between shifting schedules from both maps. Then it will discuss several effects of shift patterns, especially focusing on a turbine map.
조향감 향상을 위한 Steer-by-Wire System 제어기 설계
김창준(Changjun Kim),정명철(Myungchul Jung),오승규(Seungkyu Oh),성우제(Wooje Sung),한창수(Changsoo Han) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Steer-by-Wire(SBW) system consist of steering wheel system and front wheel system. SBW system is modeled using the bond graph method. Steering wheel system used the torque map to reactive torque control. Using the filter, the current of the front wheel system enter the steering wheel system. A driver will feel a reactive torque. In this paper, aim of SBW system controller is transmitted to driver information of the road that considered a disturbance.
좌우독립형 SBW 시스템 적용을 위한 차량 안정성 & 조종성 향상에 관한 연구
신현수(Hyunsoo Shin),김창준(Changjun Kim),김기헌(Kiheon Kim),한창수(Changsoo Han) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents a control algorithm for a steer-by-wire(SBW) System. In an SBW system in a passenger car. the usual mechanical linkage between the steering wheel and the front wheels is replaced with an electrical connection. An SBW system consists of two parts: the steering wheel system and the front wheel system. This research considers the tie rod actuating type of the front wheel system, in which two independently actuating motors control the front wheels. The steering wheel and front wheel motors are modeled, using the bond graph method for both, but controlled by different means. The steering wheel system control algorithm used a torque map to generate reactive torque and damping. In the development of the tie-rod actuating type SBW system described herein, the Ackerman constraint was used for control of the two motors to improve stability. and maneuverability.
김창준(Changjun Kim),김현수(Hyunsoo Kim),김기헌(Kiheon Kim),한창수(Changsoo Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper is about steering system of Steer-by-Wire(SBW). As a SBW system is applied in order to improve steering feel and maneuverability, the controller should have two purposes. One is controlling steering wheel for the driver's steering feel and the other is controlling the front wheel system for vehicle stability. This study focuses on steering wheel system. The column is reduced in the SBW steering wheel system. Therefore it need artificial steering feel. This is the study for an objective evaluation method with steering angle, steering torque to quantify steering feel of SBW system. Based on this method, the affect two different torque map performance was simulated and compared each other.