Performance Testing of a Vehicular Flywheel Energy System

Flynn, M.M.; Zierer, Joseph; Thompson, Richard C.

doi:10.4271/2005-01-0809

Cited by 23 publications

(16 citation statements)

References 2 publications

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“…Recent developments of flywheel technology have shown advantages in terms of mass and life span when used for regenerative braking [13][14][15]. The results presented here are for the specific case of low-speed regional diesel trains, which experience high braking losses.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Driving Strategy on Hybrid Regional Diesel Trains

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Griffiths

Smith

2011

Proceedings of the Institution of Mechanical Engineers, Part F:

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Vehicle braking in non-electrified rail systems wastes energy. This article considers two approaches to reducing braking losses in regional diesel trains: efficient driving strategies and regenerative braking. The interaction of these two approaches is critical in specifying the requirements of a hybrid train and assessing the relative fuel saving. Computational models of conventional and hybrid diesel-hydrodynamic regional trains have been developed using real route data to generate a simple control algorithm and investigate the effect of driving strategy on fuel consumption and journey time. The current modelling predicts fuel savings of up to 40 per cent for the hybrid train when an aggressive control strategy is used. This fuel saving is halved when an efficient driving strategy is employed, which also reduces the required energy storage capacity. The model provides a tool for identifying effective control strategies which should be implemented to reduce fuel consumption for both conventional and hybrid trains.

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Section: Discussionmentioning

confidence: 99%

The Effect of Driving Strategy on Hybrid Regional Diesel Trains

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Griffiths

Smith

2011

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…This flywheel operated at 40,000 r/min and could deliver 844 Wh at a power rating of 150 kW. Road testing of the bus revealed acceleration time to 75 km/h was reduced by a factor of two with a simultaneous reduction in engine power of 25 % [3].…”

Section: Introductionmentioning

confidence: 98%

Low Cost Flywheel Energy Storage for a Fuel Cell Powered Transit Bus

Hearn

Flynn

Lewis

et al. 2007

2007 IEEE Vehicle Power and Propulsion Conference

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Abstract-This paper presents work that was performed to design a compact flywheel energy storage solution for a fuel cell powered transit bus with a focus on commercialization requirements. For hybrid vehicle applications, flywheels offer much higher power densities than conventional batteries. The presented design attempts to maximize the use of lower-cost technologies. The rotor relies primarily on steel for the flywheel structure, and emphasis is placed on size reduction for vehicle packaging advantages Simulations of bus configurations on measured routes was performed using PSAT to correctly size the flywheel energy storage system.

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“…Advanced flywheels fabricated from composite materials have been shown to combine high specific energy and specific power, making them suitable for automotive regenerative braking applications where the typical charging time is of the order of 10 s [7][8][9][10][11]. Such flywheels are passive devices requiring an actively controlled transmission that is capable of applying torque to the flywheel in order to achieve discharge and recharge of the device.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of flywheel energy storage systems with geared transmission for hybrid vehicles

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Smith

Pullen

2015

Mechanism and Machine Theory

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Flywheel energy storage devices may be coupled to mechanical transmissions for braking energy recovery and the provision of additional power for acceleration in hybrid vehicles. Power transmission across a continuous range of speed ratios is necessary. The flywheel size and depth-ofdischarge must be chosen for a particular application, and this has a direct effect on transmission efficiency, required gearing ratios and mass of components. Optimisation of these parameters requires a fundamental understanding of this interaction, which has not previously been investigated and reported. To address this, the current paper presents a new method of analysing mechanical flywheel systems. A simple algebraic analysis can be used to specify flywheel system parameters for any regenerative braking application where the flywheel is used to provide initial acceleration of the vehicle from stationary. This has been applied to systems using geared transmissions with continuous speed variation achieved through sliding contact in clutch and brake components. The results of the analysis highlight how the optimum selection of flywheel depth-of-discharge must achieve a balance between high transmission efficiency and low system mass. This is illustrated for a passenger car application, allowing a full assessment of system performance and the specification of appropriate design parameters.

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Performance Testing of a Vehicular Flywheel Energy System

Cited by 23 publications

References 2 publications

The Effect of Driving Strategy on Hybrid Regional Diesel Trains

The Effect of Driving Strategy on Hybrid Regional Diesel Trains

Low Cost Flywheel Energy Storage for a Fuel Cell Powered Transit Bus

Optimisation of flywheel energy storage systems with geared transmission for hybrid vehicles

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