Environmental Engineering Reference
In-Depth Information
Ess one way
6
Conversion loss
3
Kinetic and braking
including regeneration
4
Converter loss
6
Energy
storage
system
Utility
Power
converter
Rolling resistance
22
On-board
charger
Transmission
FD
M/G
100 Units
electricity
Veh. sys.cnt'l
Aerodynamic at 45mph
average
47
Driveline loss
5
Traction
motor loss
7
Units loss
27
Units to wheels
73
Figure 1.15 Energy flow in the BEV
activity on clarification of electric energy usage by plug-in and BEV and how fuel
economy is to be computed when a portion of the driving is CD.
3
Example 2:
Compute the regenerative energy storage system (RESS) total
losses over the SAE J1634 drive cycle for a Camry Hybrid vehicle without acces-
sories (no air conditioning, lights or fans) for the case of an NiMH battery versus a
lithium ion battery (lithium-nickel-manganese-cobalt oxide type) (Figure 1.16).
The NiMH pack is rated 244.8 V, 6.5 Ah, 1.59 kWh and will be characterized at a
nominal 60% SOC. The lithium ion battery has similar ratings 244.2 V, 6.5 Ah,
1.59 kWh and will be characterized at 60% SOC and is assumed to have a one-way
efficiency of 93%. Both vehicles operate in CS mode and are exercised over a
UDDS + UDDS + Hwy + Hwy drive cycle sequence according to SAE J1634.
(a)
(b)
Figure 1.16 (a) Camry Hybrid under-hood; (b) Panasonic battery pack
(representative)
Test results for Camry Hybrid with NiMH pack:
Input charge (Ah
in
= 13.18 Ah); output charge (Ah
out
= 9.18 Ah) for a difference
of 4 Ah.
3
M. Duoba, T. Bohn, E. Rask, SAE Surface Vehicle Recommended Practice: J1711, J2841 and J1634. Team
led by M. Duoba at Argonne National Laboratory, Advanced Powertrain Research Facility, APRF.
