Environmental Engineering Reference
In-Depth Information
In (1.4),
R
is the radius of curvature of the intended steering path and
t
is the
vehicle's tyre track. Tyre track is defined as the distance between the wheel
planes along the axle centreline. Packaging hybrid components above the cg will
have a marked impact on steering performance and handling. Table 1.11 is a
summary of a 4-passenger compact car specification [15] for the new Ford Focus
5 door.
Table 1.11 Focus 5 door 4-passenger specifications
Parameter
Unit
Value
Curb weight
kg
1,077
Gross weight
kg
1,590
m
2
Frontal area
2.11
Drag coefficient
#
0.335
Length (bumper to bumper)
mm
4,152
Wheelbase (axle to axle length)
mm
2,615
Width (to outside of tyres)
mm
1,699
Track (tyre centreline to tyre centreline)
mm
1,487-1,494
Floor pan height above road
mm
325
Height, road surface to roof line
mm
1,430
Front longitudinal length '
A
' (estimated)
mm
959
Rear longitudinal length '
B
' (estimated)
mm
1,656
Centre of gravity height '
H
' (estimated)
mm
780
Engine specification:
1.6 L Zetec SE power
kW at rpm
74 at 6,000
Torque
Nm at rpm
145 at 4,000
Fuel consumption, NEDC
l/100 km
6.8
Transmission specification:
First: 2.816:1
4F27E (Japan)
#
Second: 1.498:1
4-speeds
Third: 1.000:1
F-front wheel drive
Fourth: 0.726:1
27-270 Nm input torque
Reverse: 2.649:1
E - electronic shifted
FD: 4.158:1 (1.6 L)
5-speed manual
#
First: 3.58:1
Second: 1.93:1
Third: 1.28:1
Fourth: 0.95:1
Fifth: 0.76:1
FD: 3.82:1
FD, final drive ratio of differential. Engine and transmission type and gear ratio coverage are selected to
meet performance. Zetec 1.4 L with 4F27E is best suited to urban traffic. Zetec 1.6 L with 5 speed MT is
best suited to rural plus urban driving. Production tyres are P185/65R14
Example 3:
Estimate the dynamic rolling radius of the 2010 Prius IV standard tyre.
The manufacturer lists this as a P195/65R15 (as we'll learn later this is the code for
a passenger car tyre (P) having tread width,
W
tyre
= 195 mm and a sidewall height
H
tyre
= 65% of its tread). In this example the tyre is on a 15
00
rim (or hub).
