• Title/Summary/Keyword: Compound-split

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Compound CVT realizing Power Circulation Mode and Power Split Mode (동력순환형과 동력분류형을 구현 가능한 복합형 무단변속기)

  • Choi Sang-Hoon;Kim Yeon-Su
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.14 no.4
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    • pp.96-103
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    • 2005
  • We designed the compound CVT(Continuously Variable Transmissions) by combining power circulation mode and power split mode, which have been proposed for connecting 2K-H I differential gear to the V- belt type CVU(Continuously Variable Unit), as an input coupled type. With the designed compound CVT, we carried out theoretical analysis and performance experiments for efficiency, speed ratio, power flow, and power transmission ratio. We proved that the compound CVT had a better performance than either of the power circulation mode or power split mode.

Design and Performance Verification of Compound CVTs with 2K-H I type Differential Gear

  • Kim Yeon-Su;Park Jae-Min;Choi Sang-Hoon
    • Journal of Mechanical Science and Technology
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    • v.20 no.6
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    • pp.770-781
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    • 2006
  • This paper defined design constraints for the compound CVTs (continuously variable trans-missions) by combining power-circulation-mode CVTs and power-split-mode CVTs, which were proposed for connecting 2K-H I-type differential gear to V-belt-type CVU (Continuously Variable Unit). The design constraints are the necessary and sufficient conditions to avoid geometrical interferences among elements in the compound CVTs, and to guarantee smooth assembly between the power-circulation-mode CVT and power-split-mode CVT Two com-pound CVTs were designed and manufactured in accordance with the design constraints. With these compound CVTs, theoretical analysis and performance experiments were conducted. The results showed that the design constraints were valid and effective design method, and that the designed compound CVTs had the improved performance.

Performance Analysis of Compound CVTs with a 2K-HI (2K-HI 형식 복합형 무단변속기의 성능실험)

  • Park J.M.;Kim Y.S.;Lee S.H.;Choi S.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.1345-1348
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    • 2005
  • We designed the compound CVT (Continuously Variable Transmissions) by combining power circulation mode CVT and power split mode CVT, which have been proposed for connecting 2K-H I differential gear to the V- belt type CVU (Continuously Variable Unit), as an input coupled type. With the designed compound CVT, we carried out theoretical analysis and performance experiments. We proved that the compound CVT had a better performance than either of the power circulation mode or power split mode.

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Performance Efficiency of Compound CVTs with a 2K-H II (2K-H II 형식 복합형 무단변속기의 효율실험)

  • Park J.M.;Kim Y.S.;Lee S.H.;Choi S.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.670-673
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    • 2005
  • We designed the compound CVT (Continuously Variable Transmissions) by combining power circulation mode CVT and power split mode CVT, which have been proposed for connecting 2K-H II differential gear to the V- belt type CVU (Continuously Variable Unit), as an input coupled type. With the designed compound CVT, we carried out theoretical analysis and performance experiments. We proved that the compound CVT had a better performance than either of the power circulation mode or power split mode.

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Compound CVT with K-H-V Differential Gear and V-belt Drive

  • Kim, Yeon-Su;Choi, Sang-Hoon
    • International Journal of Precision Engineering and Manufacturing
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    • v.6 no.1
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    • pp.5-14
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    • 2005
  • Continuously variable transmission (CVT) mechanisms combine the functions of a K-H-V type differential gear unit and a V-belt type continuously variable unit (CVU). For the 24 different mechanisms, 12 of them are power circulation modes while the other 12 are power split modes. Some useful theoretical formulas related to speed ratio, power flow and efficiency were derived and analyzed. These mechanisms have many advantages: they decrease CVT size and weight, increase overall efficiency, extend speed ratio range, and generate geared neutral. Compound CVTs were developed by combining the power circulation mode and power split mode, which can offer backward motion, geared neutral, underdrive and overdrive.

ANALYSIS OF PLANETARY GEAR HYBRID POWERTRAIN SYSTEM PART 1: INPUT SPLIT SYSTEM

  • Yang, H.;Cho, S.;Kim, N.;Lim, W.;Cha, S.
    • International Journal of Automotive Technology
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    • v.8 no.6
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    • pp.771-780
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    • 2007
  • In recent studies, various types of multi mode electric variable transmissions of hybrid electric vehicles have been proposed. Multi mode electric variable transmission consists of two or more different types of planetary gear hybrid powertrain system(PGHP), which can change its power flow type by means of clutches for improving transmission efficiencies. Generally, the power flows can be classified into three different types such as input split, output split and compound split. In this study, we analyzed power transmission characteristics of the possible six input split systems, and found the suitable system for single or multi mode hybrid powertrain. The input split system used in PRIUS is identified as a best system for single mode, and moreover we identified some suitable systems for dual mode.

Analysis of the Influence of an Architecture on Vehicle Performances (입력 분기식 하이브리드 동력전달계의 구조별 성능 분석)

  • Yang, Ho-Rim;Jo, Nam-Uk;Cho, Sung-Tae;Lim, Won-Sik;Cha, Suk-Won
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.11a
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    • pp.109-112
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    • 2006
  • In the recent studies, various types of multi mode electric variable transmission for hybrid electric vehicle have been proposed. Multi mode electric variable transmission consists of two or more different type planetary gear hybrid powertrain system(PGHP), which can change its power flow type by means of clutches for improving transmission efficiencies. Generally the power flows can be classified into three different types such as Input split, output split nd compound split. In This paper, we present velocity and torque equations of the input-split powertrain and analyze its optimal Performances. There are six combinations of the input-split powertrain, each combination has various lever length. We find optimal planetary gear ratios for fuel economy and acceleration performance, and compare performances of each combination.

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Development of CVTs Composed of a 2K-H I Type Differential Gear Unit and a V-belt Drive (2K-H형 I 형식 차동기어장치와 V-belt 전동장치를 결합한 무단변속기의 개발)

  • Kim, Yeon-Su;Choi, Sang-Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.6
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    • pp.1060-1068
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    • 2002
  • Compound continuously variable transmission(CVT) mechanisms are proposed, which can offer a backward mode, a geared neutral, an underdrive mode and an overdrive mode. They are composed of a 2K-H I type differential gear unit, a V-belt type continuously variable unit(CVU), a few friction clutches and gears, and not required of a starting device as a torque converter. Compound CVT mechanisms developed here present two distinct operating modes which are a power circulation mode and a power split mode. The transition of two modes takes place at the particular CVU speed ratio. For these CVT mechanisms, performance analysis related to speed ratio, power ratio and efficiency are executed and proven by experimental studies.

A mixed model for repeated split-plot data (반복측정의 분할구 자료에 대한 혼합모형)

  • Choi, Jae-Sung
    • Journal of the Korean Data and Information Science Society
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    • v.21 no.1
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    • pp.1-9
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    • 2010
  • This paper suggests a mixed-effects model for analyzing split-plot data when there is a repeated measures factor that affects on the response variable. Covariance structures are discussed among the observations because of the assumption of a repeated measures factor as one of explanatory variables. As a plausible covariance structure, compound symmetric covariance structure is assumed for analyzing data. The restricted maximum likelihood (REML)method is used for estimating fixed effects in the model.

Analysis of the Efficiency of the Compound-split Hybrid Systems (복합 유성 기어로 구성된 하이브리드 시스템 효율 분석)

  • Kim, Nam-Wook;Yang, Ho-Rim;Cho, Sung-Tae;Park, Yeong-Il;Cha, Suk-Won
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.5
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    • pp.118-124
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    • 2007
  • The efficiency of the hybrid systems which are composed of compound planetary gear sets depend on the amount of the recirculating energy among the motors and battery. This paper studies the analysis of the system efficiency with the parameters, ${\alpha},\;{\beta},\;{\gamma_a},\;{\gamma_b}$ and $\gamma_s$. The efficiency of the systems and the relative torque, speed and power of the power resources are represented by these parameters. The recuperating parameter $\kappa$ which makes the systems generalized is introduced, so the efficiencies of the modes such as the hybrid mode, the engine mode, the motoring mode and the recuperating mode are analyzed with simple equations. The tendency of the system efficiency according to the variations of the $\gamma_s$ and $\kappa$ are studied, by which it can be possible to reduce the loss of the power because the strategies for avoiding the singular speed ratio $\gamma_s$ are helpful for the system efficiency and specific value of $\kappa$ can increase the efficiency of the systems.