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유성필(Seongpil Ryu),박영진(Youngjin Park),박윤식(Younsik Park),서문석(Moonsuk Suh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
As the tracked vehicle’s running speed is increasing, undesirable vibration could become unbearable particularly in the case of field running. The preview controller is designed to improve the performance of tracked vehicle system. In this paper, a proper preview controller is proposed for nonlinear tracked vehicle systems. The LQ preview control, robust preview control and reference model tracking preview control algorithm are designed for the tracked vehicle system. Commercial program model including track and nonlinear components is used to verify the control algorithm.
센서 잡음이 존재하는 경우의 궤도 차량에 대한 예견 제어
유성필(Seongpil Ryu),박영진(Youngjin Park),박윤식(Younsik Park),서문석(Moonsuk Suh) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, a reference model tracking preview controller is designed for nonlinear tracked vehicle systems. The reference model to be tracked consists of observer-based preview controller and linear tracked vehicle model. The observer based preview controller is an optimal controller at noisy environment such as system and sensor noises. The linear tracked vehicle model is modified to use a rate of vertical road elevation as preview information. Commercial program model is used to verify the control algorithm. The performance of the preview control system is evaluated on the ride quality which is estimated from the acceleration of the driver's position.
유성필(Seongpil Ryu),박윤식(Younsik Park),박영진(Youngjin Park) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
A framework for solving the discrete-time robust H∞ preview control algorithm is presented in this paper. The equality of augmented preview information to the state variable and non-augmented one is showed using a Hamiltonian approach.
하이브리드 연료 전지 자동차의 배터리 충전량 변화량을 고려한 가상 연비 평가 방법 분석
한지훈(Jihun Han),박영진(Youngjin Park),유성필(Seongpil Ryu) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Virtual fuel economy evaluation method using equivalent energy concept is proposed to consider final SoC of battery in case that final SoC is different from initial SoC. In a FCHEV, the fuel cell stack is assisted by one or more energy storage systems such as battery and super-capacitor. Several supervisory control strategies to improve the fuel economy can’t satisfy the objective that each of the final SoC is perfectly same as initial SoC. Therefore it is necessary to consider final SoC in order to compare fuel economy fairly. In this paper, equivalent energy concept is used to convert the used battery energy into the hydrogen energy for specific driving mode. The equivalent energy relationship between battery energy and hydrogen energy is only obtained from iterative search in off-line as the ratio of required power to battery power is increased. By using this relationship, virtual fuel economy can be calculated by compensation of additional hydrogen energy. And SAE J1711 is used to compare the results of the proposed method.
도로의 경사도 정보를 이용한 하이브리드 연료 전지 자동차의 적응 룰 기반 전력 분배 전략
한지훈(Jihun Han),박영진(Youngjin Park),유성필(Seongpil Ryu) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Fuel cell is being considered as an alternative power source, which can replace the conventional combustion engine. However it has some drawbacks such as low power density and inability of energy recovery. Therefore Fuel cell hybrid electric vehicle (FCHEV) technology has been widely studied in recent years in order to overcome these drawbacks of fuel cell vehicle (FCV). In a FCHEV, the fuel cell stack is assisted by one or more energy storage systems such as battery and super-capacitor. Power distribution between fuel cell and battery is most important for both improving the fuel economy and maintenance of battery’s state of charge (SoC) at reasonable level. In this paper, Adaptive rule-based controller for power distribution of FCHEV is proposed. Simple rule-based controller with constant thresholds can’t guarantee the performance for unexpected terrain (uphill, downhill) because the battery needs to provide relative large amount of power. Therefore proposed adaptive rule-based controller uses road slope information to vary threshold in order to distribute the propulsive power for battery. To verify the improvement in vehicle fuel economy and maintenance of SoC, optimal vehicle fuel economy and target trajectory of SoC by using dynamic programming is used.
회생 제동 에너지 회수율 최대화 및 차량 안전성 보장을 위한 하이브리드 연료 전지 자동차의 회생 제동 협조 제어
한지훈(Jihun Han),박영진(Youngjin Park),박윤식(Youn-sik Park),유성필(Seongpil Ryu),최서호(Seo-ho Choi) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
One of the most important control problems to improve fuel economy in fuel cell hybrid electric vehicle is cooperative regenerative braking control strategy because the electric motor can convert the kinetic or potential energy into electric energy that can be stored in super-capacitor and reused. In this study, an electric motor for regenerative braking is directly connected to the front drive axle only because front-wheel drive vehicle is common for passenger vehicle. Vehicle stability can be lost in case regenerative braking torque is applied only to front wheels for maximum braking energy recovery, i.e., FCHEV might get into an unstable motion called lock-up and understeer. Therefore, we propose systematic controller guaranteeing the vehicle stability while guaranteeing maximum regenerative braking energy recovery. Upper controller generates the desired yaw moment calculated by using LQR method for following the desired the yaw rate and side slip angle. And lower controller applies optimal regenerative braking torque and mechanical braking torque independently within equality constraints (the required total longitudinal force and yaw moment) and inequality constraints (friction circle) for optimal regenerative braking energy recovery. Carsim™ computer simulation is used to verify the effectiveness of the proposed controller.