PhD Thesis - Cranfield University

Chapter 1
and energy management problem encompasses the energy systems as well as the conversion
and distribution of power. The vehicle load demand that is analysed in this dissertation is
limited to the propulsion loads. Although the non-propulsion load demands have been
investigated as part of this research project, the core of the work presented here will focus
on addressing the system encapsulated as power and energy management.
1.6 Methodology
Traction
Motor
Traction
Drive
Propulsion Load
Power & Energy Management System
17
Type 1 -Energy
Sytem (Battery)
Power
Conversion &
Distribution
Type 2 -Energy
Sytem (Ultracapacitor)
Figure 1.4 EV drive train and power system architecture
Auxiliary
Systems
Non -propulsion
Loads
An important aspect of this work that has a direct impact on the research methodology is
the choice of the system under investigation. In order to gain and contribute implementation
insights to the problem of managing power and energy in a vehicular environment, a
pragmatic approach in this applied research project is adopted. The research begins from the
general proposition of augmenting the main energy system of a vehicle with a high power
capability power buffer system. Having identified the intended energy system technology to
investigate, the research proceeds in reviewing past and current techniques to coordinate the
operation of multiple energy systems in vehicle power system architectures.