Study of Vehicle Pulling Phenomenon and Various …
249
Table 1 Test conditions for pulling test
Case Condition
Pull criteria
A
Vehicle moves from one edge of the lane to
the other (about 1 m)
Time taken is 6 s or less at 65 kmph, or
4.5 s or less at 80 kmph
B
Vehicle moves across one full lane (about
3 m)
Time taken is 9 s or less at 65 kmph, or
7 s or less at 80 kmph
Preparation
(50m)
Testing Area (150m)
Road
Width
(3-3.5m)
Case A
Case B
6s at 60 Km/hr
9s at 60 Km/hr
Safety Area (50m)
Fig. 1 Vehicle pulling checking procedure
4. Two passes were made to validate the concern at different speeds. Approached
the test road section and drove through at 70–80 kmph. Centered the steering
wheel, then slightly turned (3°) the steering vehicle to the left and then to the
right to get a feel for centeredness. Held the steering wheel with a light touch
on center. If the vehicle drove straight but steering wheel is off center, it was
required to perform an alignment to correct the condition.
5. Noted the direction toward which the vehicle tends to drift or pull. If the vehicle
had a tendency to go left, then place the vehicle on right lane and vice versa.
To ensure accuracy, test was repeated with the vehicle traveling in the opposite
direction on the same road for multiple times.
6. Two measurements were taken. First, how long it takes for the vehicle to move
from one edge to the other edge (case A) and secondly, how long it takes for
the vehicle to move across one complete lane (case B). Used the conditions in
Table 1 given below to confirm drifting or pulling condition.
7. It was ensured that strong wind was not blowing during the road test (Fig. 1).
3 Pulling Vehicle Wheel Alignment Data Distribution
A regular vehicle model was selected for study with the specifications as shown in
the following Table 2.
Based on the vehicle design parameters, the wheel alignment specifications are
set and are as shown in Table 3.
For this study, 51 random vehicles are selected with vehicle pulling problem.
During the vehicle manufacturing, the wheel alignment is done. This wheel alignment
data is recorded for all the production vehicles (Fig. 1).
249
Table 1 Test conditions for pulling test
Case Condition
Pull criteria
A
Vehicle moves from one edge of the lane to
the other (about 1 m)
Time taken is 6 s or less at 65 kmph, or
4.5 s or less at 80 kmph
B
Vehicle moves across one full lane (about
3 m)
Time taken is 9 s or less at 65 kmph, or
7 s or less at 80 kmph
Preparation
(50m)
Testing Area (150m)
Road
Width
(3-3.5m)
Case A
Case B
6s at 60 Km/hr
9s at 60 Km/hr
Safety Area (50m)
Fig. 1 Vehicle pulling checking procedure
4. Two passes were made to validate the concern at different speeds. Approached
the test road section and drove through at 70–80 kmph. Centered the steering
wheel, then slightly turned (3°) the steering vehicle to the left and then to the
right to get a feel for centeredness. Held the steering wheel with a light touch
on center. If the vehicle drove straight but steering wheel is off center, it was
required to perform an alignment to correct the condition.
5. Noted the direction toward which the vehicle tends to drift or pull. If the vehicle
had a tendency to go left, then place the vehicle on right lane and vice versa.
To ensure accuracy, test was repeated with the vehicle traveling in the opposite
direction on the same road for multiple times.
6. Two measurements were taken. First, how long it takes for the vehicle to move
from one edge to the other edge (case A) and secondly, how long it takes for
the vehicle to move across one complete lane (case B). Used the conditions in
Table 1 given below to confirm drifting or pulling condition.
7. It was ensured that strong wind was not blowing during the road test (Fig. 1).
3 Pulling Vehicle Wheel Alignment Data Distribution
A regular vehicle model was selected for study with the specifications as shown in
the following Table 2.
Based on the vehicle design parameters, the wheel alignment specifications are
set and are as shown in Table 3.
For this study, 51 random vehicles are selected with vehicle pulling problem.
During the vehicle manufacturing, the wheel alignment is done. This wheel alignment
data is recorded for all the production vehicles (Fig. 1).