Developments in Full Toroidal Traction Drive Infinitely and Continuously Variable Transmissions

Brockbank, Chris; Burtt, David

doi:10.4271/2007-01-3740

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…Whenever axial forces at both pulleys are not equal, speed ratio varies until the next axial-force equilibrium [22,23]. Both speed ratio nevi and efficiency l1evl [24] of CVT are modeled as nonlinear functions of the rotational speed at the driving pulley and the load torque at the driven pulley, which are represented as 2-D lookup tables in this paper. The out torque of CVT Tevi can be expressed as �VI =(T: +TBSG)·nevI .…”

Section: B Belt-driven Starter Generatormentioning

confidence: 99%

Adaptive power management strategy for Hybrid Electric Vehicle with Belt-driven Starter Generator

Guan

Chen

Huang³

et al. 2015

2015 IEEE 12th International Conference on Networking, Sensing and Control

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The increase of oil price has become a global long term trend. Major automotive manufactures started to put more resources in the research and development of new energy vehicles. Hybrid Electric Vehicle (HEV) which consists of internal combustion engine and electric machine can overcome the disadvantages of these components using power management control strategy, such that the engine can be operated in the highly efficient region. Thus enhance the efficiency of energy usage and increase the cruising distance of the vehicle. The automotive industries in Taiwan are currently developing the HEV equipped withBelt-driven Starter Generator (BSG). The power management control strategy will be developed for BSG-HEV in this paper. Equivalent fuel consumption minimization is used to design the proposed adaptive power management control strategy, such that fuel consumption can be effectively reduced for different driving patterns. Self-organizing fuzzy controller is used to adaptively adjust the equivalence factor which is used to convert the electric power usage to equivalent fuel consumption. A cost function of instantaneous fuel consumption is minimized to obtain the optimum power split between the BSG and engine.Keywords-belt-driven starter and generator; hybrid electric vehicle; equivalent fuel consumption minimization; equivalence factor; adaptive power management control.

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Section: B Belt-driven Starter Generatormentioning

confidence: 99%

Adaptive power management strategy for Hybrid Electric Vehicle with Belt-driven Starter Generator

Guan

Chen

Huang³

et al. 2015

2015 IEEE 12th International Conference on Networking, Sensing and Control

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“…As shown in Figure 1, their main components are the input disc and roller and output disc. The power transmission of the Toroidal CVTs is achieved by shearing an extremely thin oil film generated between the roller and the disc, which can be described by the theory of Elastohydrodynamic Lubrication (EHL) [6]. Toroidal CVTs are classified into Full-Toroidal CVTs and Half-Toroidal CVTs.…”

Section: Introductionmentioning

confidence: 99%

A Mathematical Method for Eliminating Spin Losses in Toroidal Traction Drives

et al. 2015

Mathematical Problems in Engineering

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The efficiency of the original Toroidal continuously variable transmission (CVT) is limited due to the spin losses caused by the different speed distribution in the contact area. To overcome this drawback, this paper replaces the original working surface with a new surface derived from a differential equation and proposes a novel Logarithmic CVT. Equations and ranges of the transmission ratio range, half-cone-angle, and conformity ratio, which are essential geometrical parameters of the Logarithmic CVT, are derived. A set of geometrical parameters is further recommended. With such geometrical parameters, the transmission ratio range of the Logarithmic CVT is as wide as that of the Half-Toroidal CVT. The two types of CVTs are compared with each other in terms of efficiency based on a widely accepted computational model. The results show that efficiency of the Logarithmic CVT is higher than that of Half-Toroidal CVT except for some particular situations because of the thrust bearing losses.

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