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[동력전달계부문] 엔진과 정유압기계식 변속장치의 통합제어
성덕환(Dukhwan Sung),김달철(Talchol Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, an integrated control algorithm is presented for an engine and hydro-mechanical transmission(HMT) for a tracked vehicle by considering split-power flow characteristics. A network theory is used to analyze direction and magnitude of the power in the HMT which has a split-torque path configuration. Based on the network model of the HMT, the engine-HMT integrated control algorithm is developed. The integrated control strategy consists of two controls: (I) engine power and (2) HST stroke. The power control is used to generate the power required for the vehicle while the HST stroke control is used to make the engine run on the optimal operating line. It is seen from the simulation results that the engine-HMT integrated control is able to fulfill the optimal engine operation which contributes to improve the overall fuel economy of the vehicle while also satisfying the driver's desire.
성덕환(Dukhwan Sung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this paper, the design method for 2-mode hybrid system using simple and compound planetary system is presented. For this, the classification and analysis for the power split system is performed. The possible configurations of the 4-shaft system are analyzed and it is found that 7 configurations of IO type can be used for the HEV application. In addition, 2-modes power split transmission is proposed for HEV. In this system, a simple power split configuration is used for the mode 1 in order to avoid the power circulation, and compound power split(4-shaft) configuration is used for the mode 2. Since the mode change is carried out by clutch operation, it is desirable to minimize the clutch slip speed in mode change.
성덕환(Dukhwan Sung) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
A torque converter is used to start vehicle with automatic transmission because of good performance and low price. On the other hand, it has many disadvantages like low efficiency, hydraulic loss, heat generation, etc, which make fuel economy lower than manual transmission. In this paper, power split system for torque converter is proposed to improve fuel economy and performance of automatic transmission vehicle. Using network analysis and AVL cruise, twelve types of power split system structures are analyzed. A cruise performance simulation results show that the power split system for torque converter have better fuel economy than conventional automatic transmission vehicle.
성덕환(Dukhwan Sung),김현수(Hyunsoo Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A power split system using torque converter is proposed. Using network analysis, two types of power split system structures are designed. It is found from performance simulation using AVL Cruise that the power split system adopting torque converter shows better fuel economy and acceleration performance than conventional automatic transmission vehicle.
성덕환(Dukhwan Sung) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
A power split design using multi step transmission is proposed to match with engine down-sizing trend. The power split transmission transmits the power in two or more paths by planetary gear set, which can make transmission down-sizing to decrease power flow to each path by power split. Power split structure using one planetary gear set which called three shafts system is classified as input split and output split type according to the place of planetary gear set. In this paper, a power split transmission with four stepped automatic transmission and one planetary gear set is designed in input split structure. As a result of vehicle simulation for 3.3 liter passenger car, the fuel consumption is improved 5% in FTP75 driving cycle and 4% in combined driving cycle.
성덕환(Dukhwan Sung),김현수(Hyunsoo Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, a classification method for 4-shaft power split transmission system is introduced. Using the classification method, 36 possible configuration of the 4-shaft system are analyzed and it is found that 7 configurations can be used for the HEV application. In addition, 2-modes 4-shaft power split transmission is proposed for HEV. In this system, a 3-shaft configuration is used for the mode 1 in order to avoid the power circulation, and 4-shaft configuration is used for the mode 2. Since the mode change is carried out by clutch operation, it is desirable to minimize the clutch slip speed in mode change.
가진 토크 변화에 따른 토크 컨버터 피스톤 어셈블리의 내구성 연구
정덕환(Dukhwan Jung),이재용(Jaeyong Lee),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
A torque converter in automatic transmission consists of the hydrodynamic clutch device and the lock-up clutch device. Especially the piston in lock-up clutch device connected leaf-spring, piston drive plate. And the piston drive plate welded with piston hub using electron beam welding. This test evaluates the piston assembly durability according to changes excitation torque. So measure the deformation of products due to the increase of the durability cycle and check the E.B welding parts.
성덕환(Dukhwan Sung),오종선(Jongsun Oh),조재호(Jaeho Cho),송경(Kyoung Song),권의섭(Eaisub Kwon) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, an optimization process for a torque converter performance using design for six sigma is presented. An optimization is performed to improve the fuel economy and drive performance of vehicle by optimizing torque converter capacity factor Cf. To optimize Cf curve, L18 orthogonal array is used for experiments design and 8 control factors and 4 noise factors are selected. The fuel economy and drive performance results are found from the vehicle performance simulation. After the normalizing and indexing of simulation results, the optimum torque converter Cf is deduced. Torque converter which can realize an optimum performance is designed by CFD analysis. The result shows that fuel economy can be improved by the optimization process.