A Control System for Battery Charging in Buses
A common configuration in buses is that the engine is placed in the
rear of the bus and that the batteries are placed in the front of the
bus due to optimization of the distribution of the weight. The long
wires running between the engine and the batteries together with large
power consuming units, such as fans and air condition units, result in
voltage drops. The voltage drops contribute to the battery charging
voltage level being lower than desired.
The aim with this thesis work is to implement a control system that
increases the battery voltage level when the voltage drops
occur. Measurements are performed on an articulated bus that is in
focus throughout the whole thesis work. A model for the electrical
circuit of the bus is created and used when investigating the
stability of the control system. The control system is implemented in
the bus, where also verification tests are performed.
The verification tests confirm that the control system raises the
battery charging voltage to the desired level. The increased voltage
level makes the batteries reach a higher state of charge in shorter
time since the control system provides the batteries with more charge.
Therese Kjelldal
2011
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