Modelling of loss mechanisms in a pushing metal V-belt continuously variable transmission. Part 3: Belt slip losses

Akehurst, Sam; Vaughan, N. D.; Parker, David; Simner, D

doi:10.1243/0954407042580002

Cited by 27 publications

(37 citation statements)

References 7 publications

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“…Additionally, laser displacement sensors were installed in order to detect the changes in the pitch radii of CVT pulleys and to determine the speed and torque losses under different operating conditions. Akehurst et al [10][11][12] investigated the power transmission efficiency of a metal V-belt CVT drive. The belt was constructed from several hundred segments held together by steel band sets.…”

Section: Introductionmentioning

confidence: 99%

Experimental identification of the torque losses in V-ribbed belt drives using the response surface method

Balta

Sonmez

Cengiz

2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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A drop in the transmitted torque is one of the concerns regarding the performance of belt drives, which affects the efficiency of the power transmission. In this study, the torque loss behaviour of a V-ribbed belt drive with two equal-sized pulleys is investigated using several experimental methodologies. The individual effects of belt-drive parameters are determined with the one-factor-at-a-time test method. The relation between the parameters and the torque loss is found via response surface methodology. Afterwards, the operating conditions are optimized for the minimum torque loss. A test is conducted using the optimum parameter values. The difference between the percentage torque loss predicted by the response surface curve and the experimental result is found to be 8.5%. Furthermore, the predicted model looks reasonably accurate on the basis of the analysis of variance and the residual analysis. Using the response curve, the torque loss may be estimated for similar belt drives.

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Section: Introductionmentioning

confidence: 99%

Experimental identification of the torque losses in V-ribbed belt drives using the response surface method

Balta

Sonmez

Cengiz

2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The torque loss of CVT in power transmission consists of three parts [11][12][13]: (1) torque loss due to band friction; (2) pulley deflection loss; (3) belt slip loss.…”

Section: Cvt Torque Loss and Efficiency Modelsmentioning

confidence: 99%

Regenerative Braking Compensatory Control Strategy Considering CVT Power Loss for Hybrid Electric Vehicles

Yang

Zhang

et al. 2018

Energies

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Hybrid electric vehicles (HEV) equipped with continuously variable transmission (CVT) adjust the motor operating point continuously to achieve the optimal motor operating efficiency during regenerative braking. Traditional control strategies consider the CVT efficiency as constant, while the CVT efficiency varies in different operating conditions. In order to reflect the transmission efficiency more accurately during regenerative braking, the CVT theoretical torque loss model is firstly established which then leads to the battery-front motor-CVT joint operating efficiency model. The joint operating efficiency model indicates that the system efficiency is influenced by input speed, input torque, CVT speed ratio, and battery SOC (state of charge). The compensatory strategy for the front motor barking force is proposed to make full use of its braking power and the CVT speed ratio control strategy is modified to maintain the optimal operating efficiency of the system. The simulations are performed under three typical braking conditions and UDDS, NYCC, US06 respectively, the results show that the modified control strategy increases the front motor braking power and improves the system operating efficiency.

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“…(42), which was based on the average values of CVT torque losses. Previous studies [3][4][5]14] have shown that the efficiency of metal belt CVT can be expressed as a function of ratio and input torque, which is expressed as η = η(i,T in ). The CVT efficiency map that changes with ratio and input torque at η p = 2000 r/min is shown in Figure 5…”

Section: Bench Test Performance and Cvt Efficiency Calculationmentioning

confidence: 99%

“…Numerous studies on the efficiency of CVT and gearbox have been conducted through bench tests in China and abroad. Akehurst et al [3][4][5] used bench tests to study torque losses in a metal belt CVT, which were caused by the relative sliding motion between belt segments and bands. They then forecasted and studied torque losses between belt segments and bands caused by the bending and deformation of the pulley based on experimental observations of pulley deflections.…”

Section: Introductionmentioning

confidence: 99%

Car Fuel Economy Simulation Forecast Method Based on CVT Efficiencies Measured from Bench Test

Lei

Jia

et al. 2018

Chin. J. Mech. Eng.

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Researchers face difficulties in studying the effects of driveline efficiency on car fuel economy via bench and road tests because of long working periods, high costs, and heavy workloads. To simplify the study process and shorten test cycles, a car fuel economy simulation forecast method for combining computer simulation forecasting with bench tests is proposed. Taking a continuously variable transmission (CVT) as the research object, a transmission efficiency model based on a bench test is constructed. An optimal economic variogram based on the original CVT variogram, the boundary conditions of vehicle performance, the road conditions and the driving behavior of the driver is generated in the Gear Shift Program (GSP)-Generation module in AVL Cruise. And on this basis a driveline simulation model that can calculate the fuel consumption based on the driveline data of a test car is built. The model is used to forecast fuel consumption and calculate real-time CVT efficiency under different conditions. Contrastive analyses on simulation results and real car drum test results are made. The largest error between simulation results and drum test results in driving cycles is 4.099%, which is 5.449% under constant velocity condition in driver control mode and 4.2% under constant velocity condition in automatic cruise mode. The results confirm the feasibility of the method and the good performance of the driveline simulation model in accurately forecasting fuel consumption. The method can efficiently investigate the effects of driveline efficiency on car fuel economy. Moreover, this research provides instruction for accurately forecasting fuel economy as well as references for studies on the effects of drivelines on car fuel economy. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Modelling of loss mechanisms in a pushing metal V-belt continuously variable transmission. Part 3: Belt slip losses

Cited by 27 publications

References 7 publications

Experimental identification of the torque losses in V-ribbed belt drives using the response surface method

Experimental identification of the torque losses in V-ribbed belt drives using the response surface method

Regenerative Braking Compensatory Control Strategy Considering CVT Power Loss for Hybrid Electric Vehicles

Car Fuel Economy Simulation Forecast Method Based on CVT Efficiencies Measured from Bench Test

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