Stringent future EU CO2
legislation can no longer be met through improvements in engine efficiency. As a result, it will be necessary to expand “no fuel” operation beyond simple Stop & Start systems in wide-spread use today (engine stop when vehicle stop).
Expanding “no fuel” operation beyond vehicle stop phases requires a high performance secondary power source to store the energy recuperated during deceleration, which can then be used to supply all system loads during ISS coasting (engine stop when gently decelerating).
The power and energy requirements of the secondary power source are heavily influenced by the “no fuel” operation strategy and the vehicle class, making a “one size fits all” solution very challenging. However, to maintain the order of scale required to limit both costs and development lead time, it is essential to keep the number of variations to a minimum.
Therefore, to better understand future EU market needs an evaluation of secondary power source requirements for each application was undertaken.
This presentation explores the issues described above and covers the following topics:
- Background / motivation for adopting a secondary power source
- Analysis of various “no fuel” operating strategies / topologies
- Issues to be overcome
- Evaluation of secondary power source requirements