Macroslip detection for a metal V-belt continuously variable transmission using the period difference

Ji, Jian; Jang, Mijeong; Ahn, Sunghyun; Kwon, Oheun; Chai, Minjae; Lee, Dong-Hyun; Kim, Hyunsoo

doi:10.1177/0954407014549609

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…2,3 At present, research on metallic belt CVT is mainly focused on the transmission mechanism, the speed ratio and clamping force control, and the transmission efficiency. 4 Ji et al 5 developed a CVT transmission simulation system to study the power transmission characteristics of metal belt CVT in the micro and macro slip regions under external vibration conditions. The influence of slip on the vibration transfer characteristics was analyzed in the time domain and in the frequency domain using a simulator.…”

Section: Introductionmentioning

confidence: 99%

Research on the torsional vibration performance of a CVT powertrain with a dual-mass flywheel damper system

Yan

Yin

Chen

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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Continuously variable transmissions (CVTs) can achieve continuous changes in speed ratio and can better improve the ride comfort of the car. However, the torque fluctuation of the engine will reduce its transmission efficiency, and the torsional damper is usually matched to improve transmission efficiency and reduce vibration noise. In this paper, the model of a complete vehicle power transmission system was established by using the bond graph method. The relationships between each state variable were obtained according to the system causality and the direction of the power flow, based on which the dynamic model of the entire vehicle power transmission system was derived. A simulation of the powertrain with dual-mass flywheel-continuously variable transmission (DMF-CVT) was carried out, and the torsional stiffness of the dual-mass flywheel (DMF) was optimized. Taking a certain sport-utility vehicle (SUV) as the test bench, the vehicle road testing of the DMF before and after improvement was carried out, and the test results before and after the improvement were compared to verify the correctness of the optimization direction, which provided a reference for the matching and optimization design of the DMF-CVT power transmission system.

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Section: Introductionmentioning

confidence: 99%

Research on the torsional vibration performance of a CVT powertrain with a dual-mass flywheel damper system

Yan

Yin

Chen

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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Slip behavior in pulley groove up to sliding slip at steady state and power transmitting efficiency on metal V-belt type cvt

Okuda

Okubo

Fujii

et al. 2017

JAMDSM

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This paper investigated the influence of pulley tilting on slip ratio (s) of the commercially available continuously variable transmissions (CVTs). Two types of pulleys (tiltable pulley and untiltable pulley) were prepared to investigate the influence of the tilt of pulley on the slip properties. The tilt of the driving pulley was prevented for simple comparisons when untiltable driving pulley was applied, while tiltable pulleys were conventionally used. The maximum transmitting efficiency (η) and the maximum transmitting torque were increased when untiltable pulleys were used, while slip ratio (s) was decreased. The radial displacement of contacting point due to the tilt of pulley was much affected to the penetration of the belt about max 70 times compared with that by rolling, when pulley surface was tilted. The remarkable penetration was prevented by applying untiltable pulley. In current type of CVT, practical CVT unit for commercial uses was usually driven with the slip in circumferential direction due to the tilt of pulley accompanying with radial displacement of the belt. This paper found that about 33% of slip was counted due to the tilt of pulley in observed total slip between driving and driven pulley by the specific reason where the driving pulley should be tiltable for the motion of the shift in axial direction on the shaft. The observed slip was dominantly caused by the penetration of the belt when the driven pulley was tilted.Keywords : Metal V-belt, CVT, Untiltable pulley, Tilting angle, Radial displacement IntroductionCVTs (Continuously Variable Transmissions) have been installed into many cars in Japan because they can continuously change the speed ratio and provide comfortable driving and low fuel consumption by allowing engines to drive efficiently. The slip should be happened between a metal V-belt and pulleys because the traction force is generated by the friction. The commercially available pulleys for practical uses are unexpectedly tilted to keep the geometrical condition with the clearance between pulley center boss and shaft, so that the pulley is moved on the shaft in axial direction for the shift changing the winding radius of the belt in the V-shaped pulley groove. Fujii, et al, experimentally showed the influence of pulley tilt on the power loss and on the transmitting efficiency of a metal belt type CVT. However, principal factor has not been shown to explain the influence of the tilt of pulley on the transmitting behaviors of the CVT.This study investigated the influence of pulley tilting on slip ratio (s) of the commercially available continuously variable transmissions (CVTs). Two types of pulleys (tiltable pulley and untiltable pulley) were prepared to investigate the influence of the tilt of pulley on the slip properties. The tilt of the driving pulley was prevented for simple comparisons when untiltable driving pulley was applied, while tiltable pulleys were conventionally used. To investigate the radial Okuda, Okubo, Fujii, Sakagami and Yagasaki, Journal of Advanced...

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Macroslip detection for a metal V-belt continuously variable transmission using the period difference

Cited by 2 publications

References 11 publications

Research on the torsional vibration performance of a CVT powertrain with a dual-mass flywheel damper system

Research on the torsional vibration performance of a CVT powertrain with a dual-mass flywheel damper system

Slip behavior in pulley groove up to sliding slip at steady state and power transmitting efficiency on metal V-belt type cvt

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