The objective of the research project was to evaluate the effectiveness of auxiliary energy storage systems, used in addition to a battery, for extending the range of an electric vehicle. Initially, the work focused around the use of a high speed flywheel to complement the electric vehicle battery. The work was then extended to cover auxiliary energy storage in general. Practical work was carried out using a Bedford/Chloride CF Van, which was equipped with various sensors by Bristol Polytechnic. Using measurements carried out on milk rounds in the local area, a driving cycle was derived, and used to characterise the CF van. This was in turn used to create a pro-forma for a typical battery current demand profile experienced during the driving cycle. Laboratory testing was carried out by repeatedly putting the battery through this basic current cycle. Further cycles were then derived from the basic cycle. These were designed to show the effect of various amounts of auxiliary storage on battery current demand, and hence overall energy output. These were used with the battery in the same way as the basic cycle, allowing a comparison of the battery with and without energy storage. At the same time as the laboratory work was being done, a computer simulation of the Bedford CF was written. Having validated the model against both laboratory results and road test data, it was used to extend the results derived in the laboratory more generally. This was done by running simulated driving cycles for different battery conditions, by varying the performance of the simulated vehicle transmission, and by using different driving cycles. Flywheel auxiliary storage was also simulated, and its efficiency varied. Results from the project establish criteria by which auxiliary storage systems may be judged, by comparing them with the battery alone, and also for comparing regenerative and non-regenerative battery current cycles. This framework is then used to create general criteria which auxiliary energy storage systems must meet if they are to be effective. Possible avenues for future work are also put forward.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:278061 |
| Date | January 1990 |
| Creators | Tempest, Andrew S. |
| Publisher | University of the West of England, Bristol |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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