Automotive hybrid technology: status, function and
development tools

Abstract: A diminishing oil reserve and increased environmental concern puts new
demands on our vehicles. This thesis aims to identify the strengths and
weaknesses of a conventional vehicle and explain the technology behind.

Alternative energy sources are introduced and together with the knowledge
learnt, their potentials are discussed. Unfortunately, none of them can be
found to fulfil all future demands. Instead, hybrid vehicles are identified
as a solution with high potential.

Hybrid vehicles are consequently defined and the additional components are
explained. The multiple energy sources of a hybrid vehicle bring increased
drivetrain flexibility but also increased control complexity. With the goal
to enhance the fuel economy and reduce emissions, optimum operating
conditions are discussed for each drivetrain component and concrete control
targets are extracted.

Due to the complexity, computer modelling and simulation are expected to be
an essential tool when it comes to hybrid vehicle development and
optimization. As a result, cost efficient component models are suggested and
finally a number of control optimization procedures are compared.

The result of this thesis is a summary of relevant knowledge needed to reduce
the development effort of hybrid vehicles. The key aspect is to understand
the synergy effect of a hybrid drive train which enables the designer to
approach the full potential of each component.