Aim
The demands for modern vehicles with high efficiency and high performance are increasing. An important means of reaching this goal is the electrification of all the loads on board, including the propulsion. This means that also the loads that traditionally are driven by a belt from the combustion motor will be driven electrically. The advantages are that these drives are more efficient and easier to place. If the propulsion of a vehicle is partly electric, the vehicle is named a hybrid vehicle. The great advantage of hybrid vehicles is that by balancing the two drive sources (the combustion engine and the electric motor) the combustion engine can be used at a higher efficiency.

For the transfer to hybrid vehicle drive systems, better knowledge of system aspects on energy conversion are needed, concerning both the design and the operation of the vehicles. This course will give basic knowledge in the field.

Knowledge and understanding
For a passing grade the student must

• have good general knowledge of the design of a hybrid vehicle and the characteristics af the most important components of it

• have good general knowledge of the composition of the drive line and the control of the energy flow in hybrid vehicle drive systems

Skills and abilities
For a passing grade the student must

• have developed the ability of choosing the most suitable drive line for a hybrid vehicle for a certain range of application and of creating control strategies for hybrid drive lines

Judgement and approach
For a passing grade the student must

• have gained the self confidence to be able to model and analyze a hybrid vehicle drive system

Contents
Drive and auxiliary drive. Power, torque and speed. Combustion processes - Otto, Diesel, HCCI among others. Gear - manual, automatic, CVT among others. Efficiency and emissions. Fossile fuel, bio fuel - access, cost and performance. EV, HEV - series, parallel, mild, power split, FCV. Conventional servo steering, AC, brake, compressed air and so on. Electrically driven alternatives, function, efficiency. Demands for electric machines and power electronics in vehicles. Criteria for dimensioning. Lifetime, weight, price and so on. Field reduction, starting characteristics, torque ripple and so on. Various types of control, need for sensors. Fuel cells - principle, function and construction. Advantages and drawbacks with various designs. Development trends. Electric storage media - eg batteries and super capacitors.

Drive cycles, efficiency, and emission for some selected drive lines. Acceleration, start and other demands for the vehicle. Regenerative braking. The need for effect and energy storage in hybrid and FC vehicles.

The course includes 28h lectures, 28h computer excercises and self study supported by internet course material, in total 200h.

Literature
Compendium in Hybrid Vehicle Drive Systems, LTH 2009.