Environmental Engineering Reference
In-Depth Information
MG1 enables the vehicle to reach approximately 75 mph prior to a compound
planetary gear shift by a ratio of 1.6:1. After the shift down in MG1 angular speed,
the vehicle can reach cruising speeds of 250 kph or 150 mph.
Development of the GS450h [18] has been described as electric turbo charging
and the means to extend the high speed capability of a single mode eCVT to
autobahn speeds. This is the first production roll-out of a shifting eCVT, the
powertrain architecture of which is shown in Figure 2.25.
r
w
V
B1
B2
E1
E2
N2
FD
R
R
ICE
N1
P
C
M/G2
Motor
Wheels
P
S
C
P
Sm
P
Sr
ETC
P
R
P
Ratio
C
B1
B2
ECU
Exec. Cnd
N1
R
High
1
0
1.9
Low
1
3.9
cA/C Brakes
0
0
=
=
Uess
ESS
Electrical
Loads
EPS
hotel
brakes, etc.
Ravigneanx gearset 'shifts' MG2 speed range
Figure 2.25 Shifting type eCVT: Lexus GS450h
Table 2.6 Lexus GS450h hybrid model specifications
Engine
3.5 L
218 kW Aerodynamic
C
d
0.27
~2.34 m
2
Tyres
P245/40ZR18
Frontal area
A
f
Dynamic rolling radius
r
w
0.327 m
Battery voltage
U
b
288 V
Vehicle curb mass
M
v
1,879
MG1 power
P
MG1
147 kW
Tyre roll resistance
C
rr
0.008
Battery power
P
b
36 kW
Wide open throttle
V
WOT
131 mph
Final drive
g
fd
3.769
Generator power
P
MG2
0-60 mph
t
z
60
5.2 s
Example 5:
Using the GS450h architecture and specifications in Table 2.6 and
given that the main traction motor, MG2, has a maximum speed of
n
max
= 14,400
rpm, find the vehicle speed shift point range.
