Environmental Engineering Reference
In-Depth Information
Table 1.9 Representative performance targets for hybrid propulsion
Performance target/unit
Target value
Units
0-100 mph (161 kph) acceleration time*
9.5
s
Passing time 50 mph (80 kph) to 70 mph (112 kph)
5.1
s
Maximum speed
90/145
kph/mph
Grade at 50 mph (80 kph)
†
7.2
%
Grade at 30 mph (48 kph)
‡
7.2
%
Maximum grade for vehicle launch
33
%
Trailer tow capability
1,000
kg
*At 60% SOC on battery
†
Sustained for 15 min
‡
Sustained for 30 min
used throughout the remainder of the topic except for specific cases where, for
example, a city bus is discussed.
1.4.5 Basic vehicle dynamics
Generic attributes for passenger cars and light trucks are listed in Table 1.10 [12].
The passenger car is a mid-sized vehicle such as a GM Chevrolet Lumina, Ford
Taurus, DaimlerChrysler Concorde, Toyota Camry or Honda Accord. Pick-up truck
and SUV data are representative of a Ford F150 or GM Silverado 1,500 pick-up
truck or an Explorer or Tahoe or Durango SUV. These values will be used as
average data for these classes of vehicles.
Table 1.10 Representative vehicle attributes for hybrid propulsion
simulation
Attribute
Unit
Mid-size car
Pick-up
or SUV
Vehicle empty or curb mass (
m
v
)*
kg
1,418
2,318
Tyre effective rolling radius (
r
w
)
m
0.284
0.336
Wheel mass factor - equivalent mass due to
wheel assembly inertias (
m
w
)
kg
58
40.9
Drive line mass factor - equivalent mass due to
powertrain and hybrid drive unit inertias (
m
pt
)
kg
28.5
39.9
Drag coefficient (
C
d
)
#
0.30
0.40
m
2
Frontal area (
A
f
)
1.37
2.48
Rolling resistance coefficient (
R
0
)
kg/kg
0.007
0.012
Ancillary and accessory average electrical load
(
P
acc
)
W
800
800
*Mass of a standard human passenger,
m
p
, is taken as 75.5 kg in all simulations of performance
