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CE 361
InClass Design Problem:
Vehicle Design
For this exercise, you are to design a vehicle by selecting dimensions, engine size, etc.
You will need to make a number of assumptions, and typical road tests are provided to
help you in this regard.
Based on your knowledge of vehicle design, select reasonable
values for the following vehicle attributes:
•
Vehicle weight (lb)
•
Engine power and torque (estimate based on roadtests provided)
•
Front or rear wheel drive
•
Wheelbase
•
Location of center of gravity
•
Total frontal area
•
Passenger capacity
•
Driver’s eye height
•
Overall gear reduction ratio (estimate based on roadtests provided)
•
Approximate 0 – 60 mi/h time
Based on the values selected above, compute the following:
1.
Optimal brakeforce proportioning (front and rear) on good, wet pavement at 70 mi/h.
2.
Maximum acceleration from rest on good, dry pavement.
3.
Theoretical stopping distance (exclude perception/reaction time) without antilock
brakes from 70 mi/h on good, dry pavement (assume a brake efficiency of 80 percent
and ignore aerodynamic resistance).
4.
Theoretical stopping distance with antilock brakes (ABS) from 70 mi/h on good, dry
pavement (assume appropriate brake efficiency for ABS and ignore aerodynamic
resistance).
5.
Include a sketch of your vehicle.
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View Full DocumentList Price
est $19,999
Price as Tested
est $22,249
PERFORMANCE
Acceleration
Time to speed
Seconds
0–30 mph
.....
2.5
0–40 mph
.....
3.8
0–50 mph
.....
5.0
0–60 mph
.....
6.8
0–70 mph
.....
8.6
0–100 mph
.....
16.8
Time to distance
0–100 ft
.....
3.3
0–500 ft
.....
8.3
0–900 ft
.....
11.9
0—1320 ft (¼ mile)
.....
15.1 @ 94.6 mph
Braking
Minimum stopping distance
From 60 mph
.....
133 ft
From 80 mph
.....
228 ft
Control
.....
excellent
Brake feel
.....
very good
Overall brake rating
.....
very good
Subjective ratings consist of excellent, very good, good,
average, poor; na means information is not available.
Fuel Economy
Our driving
.....
19.7 mpg
EPA city/highway
.....
22/31 mpg
Cruise range
.....
240 miles
Fuel capacity
.....
13.2 gal.
Handling
Lateral acceleration
(200ft skidpad)
.....
0.85g
Balance
.....
mild understeer
Speed through
700ft slalom
.....
68.6 mph
Balance
.....
mild understeer
Lateral seat support
.....
good
Interior Noise
Idle in neutral
.....
45 dBA
Maximum in 1st gear
.....
78 dBA
Constant 50 mph
.....
69 dBA
70 mph
.....
72 dBA
Engine
Type
.....
aluminum block &
head, inline4
Valvetrain
.....
dohc 4valve/cyl
Displacement
.....
122 cu in./1998 cc
Bore x stroke
.....
3.39 x 3.39 in./
86.0 x 86.0 mm
Compression ratio
.....
11.0:1
Horsepower (SAE)
.....
197 bhp @ 7800 rpm
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 Spring '09

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