Performance Investigations of a Novel Rolling Traction CVT

Akehurst, Sam; Brace, Chris; Vaughan, N. D.; Milner, Peter M.; Hosoi, Yukiharu

doi:10.4271/2001-01-0874

Cited by 12 publications

(6 citation statements)

References 4 publications

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“…7. A ratio range of 2.64:1 was required for the twin-charged system, which is well within the capacity of most CVT systems, including traction drives [19] such as the Milner continuously variable transmission (MCVT) [20,21], the Torotrak full-toroidal variator [22], the half-toroidal variator [23], and the belt drive CVT [24]. However, this ratio range is only taking into account full-load conditions; at part load, air mass delivery requirements would be proportionally less than these, implying a further required reduction in the supercharger drive ratio.…”

Section: Cvt Ratio Rangementioning

confidence: 99%

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Modelling the performance of a continuously variable supercharger drive system

Rose

Akehurst

Brace

2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper details a simulation-based investigation into a novel forced-induction boosting system with a centrifugal-type supercharger driven from the engine crankshaft via a continuously variable transmission (CVT). This system acts as a pre-boost to a traditional fixed-geometry turbocharger and has been identified as a possible solution to improving the low-speed engine torque and transient response of future downsized and existing turbocharged engines. The concept was modelled around an existing baseline high-speed directinjection diesel engine model featuring a variable-geometry turbocharger.Conclusions are drawn comparing the potential of the proposed system with the baseline engine in terms of the brake specific fuel consumption, and both the steady state and the transient performance. A design-of-experiments approach is applied to investigate the effects of the supercharger compressor size, the turbocharger compressor and turbine size, the CVT ratio, and the engine compression ratio on the system performance. Optimization techniques are then applied to identify the best settings for these parameters in the proposed system. Transient simulation was undertaken in a MATLAB/Simulink Ricardo WAVE co-simulation environment to develop the required control strategies for the CVT supercharger.The proposed system demonstrates a significant improvement in the low-speed engine torque and transient response of the boosting system during tip-in pedal events, which it is proposed will result in a significant improvement in the vehicle performance and driveability.

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Section: Cvt Ratio Rangementioning

confidence: 99%

“…Figure 8 shows the influence of the CVT efficiency on the torque curve of the twin-charged system, indicating that for typical efficiency values [20] there is little impact on the overall performance, a CVT efficiency of 85 per cent resulting in a reduction in the peak torque of 2 per cent.…”

Section: Cvt Efficiencymentioning

confidence: 99%

Modelling the performance of a continuously variable supercharger drive system

Rose

Akehurst

Brace

2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…(Note that no kinetic (flywheel-CVT) systems are shown in Figures 6 and 8 because volume data were not available for CVTs. [49][50][51] The curves in Figures 5, 6, 7 and 8 correspond to battery-ultra-capacitor combinations, with the parameter x varying from 0.1 to 1. These curves demonstrate how the presence of the ultra-capacitor can increase the specific and volumetric powers of the combination at the expense of decreased specific and volumetric energies.…”

Section: System Plotting and Selectionmentioning

confidence: 99%

Comparison of regenerative braking technologies for heavy goods vehicles in urban environments

Midgley

Cebon

2012

Proceedings of the Institution of Mechanical Engineers, Part D:

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One way to reduce the carbon dioxide emissions of heavy vehicles is to install regenerative braking systems. These capture the kinetic energy of the vehicle during braking and store it, in order to feed it back into the drivetrain during acceleration. It is not clear, however, which of the many available technologies should be used to implement this regenerative braking. This report explores the different possible energy capture and storage technologies for regenerative braking, including electrical, kinetic, hydraulic and compressed air. The basic systems are plotted on a selection chart, and an optimal selection methodology is used to aid in the selection of the lightest and smallest system for regenerative braking. The results of this comparison and selection show that hydraulic energy storage is likely to be 33% smaller and 20% lighter than the closest electrical counterparts and is therefore a logical selection for regenerative braking on the trailers of heavy goods vehicles.

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“…Recent development on the CVT system focused on CVT mechanism such as toroidal mechanism, where a set of ball surrounding two concave pulley that have different radius contact position (Shinojima et al, 2004). This mechanism use metal-to-metal friction and several report shows its implementation on light application (Carter et al, 2007;Akehurst et al, 2001). With belt and chain drive type, this CVT mechanism use variable pulley which can vary the contact radius of belt and chain (Rockwood et al, 2014;Tenberge, 2004).…”

Section: Introductionmentioning

confidence: 99%

Modelling and validation of a novel continuously variable transmission system using slider crank mechanism

Rahman

Hudha

Kadir

et al. 2018

IJESMS

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Vehicle transmission system transfers torque and speed from the power source to drive wheels. Continuously variable transmission (CVT) system offers smooth ratio transition where it improves acceleration performance and reduces fuel consumption. Currently, most of the CVT system is actuated by the internal hydraulic circuit where compressibility of oil introduces non-linearity to the system causing difficulty in controlling CVT response. Therefore, a new free-hydraulic CVT system is developed to overcome the shortcomings in existing CVT. The proposed CVT system is designed based on belt-driven type which consists of two sets of variable pulley. Each set of variable pulleys is actuated by an electric motor using slider crank mechanism. The mathematical modelling of CVT mechanism is developed by using Lagrange formulation. The results from this study show that the simulation model of CVT mechanism can produce good performance behaviour in following desired radius position of the real CVT mechanism.

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Performance Investigations of a Novel Rolling Traction CVT

Cited by 12 publications

References 4 publications

Modelling the performance of a continuously variable supercharger drive system

Modelling the performance of a continuously variable supercharger drive system

Comparison of regenerative braking technologies for heavy goods vehicles in urban environments

Modelling and validation of a novel continuously variable transmission system using slider crank mechanism

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