Environmental Engineering Reference
In-Depth Information
Load power
0
Time
=
Dynamic power
Average power
0
0
+
Time
Time
Base load = engine Dynamics = battery + ultra-capacitor
Slow dynamics (energy) Peaking (power)
+
Figure 2.8 Illustration of propulsion system power and energy storage
2.2.1 Energy recuperator systems
Recuperator systems rely on the vehicle alternator as a means to recover decel-
eration energy as opportunity charging. Opportunity charging means boosting the
alternator field during down grades or when the vehicle brakes to a stop. Figure 2.9
illustrates one EDS architecture for a recuperator. In this system the alternator
excess energy is absorbed in an ultra-capacitor pack, stored and sent to the vehicle
battery and EDS for consumption in lieu of a battery contribution.
14 V
G
Consumer
Generator
DC
DC
500/1,000 W
M
A
16-40 V/20 F
Ultra-capacitor
Dynamic energy storage
E-steering
power
consumer
12 V
Battery
Figure 2.9 Recuperator system architecture
