Accidental and Road User Behavior TNK073

1
Accidental and Road User Behavior (TNK073)

• Deceleration with different tires equipment in
  ABS braking on ice
• Written by
• Muhammad Khurram Shahid Toor (khush090_at_student.liu
  .se)
• Wei Zhang (weizh300_at_student.liu.se)

2
Instruction of the report

• Background of ABS
• Objectives of evaluating the data relevant to
  ABS

3
Methods used

• The method here we are using is taking the
  measurement on the same type of tires, which are
  mounted in 4 different ways
• Maxi
• Oversteer
• Basic
• Understeer.

4
Results and discussions

• Calculation of deceleration of the cars from the
  given data, we use the following equations to
  compute deceleration
• Vi2(m2/s2)
• Di (m/s2)
• 2Si (m)
• V22-V12 (m2/s2)
• D12 (m/s2)
• 2S12 (m)
  

5
The comparisons among decelerations measured
different conditions

• Supplied by the cars with and without ABS in
  decided braking distance
• Calculated from the cars with and without ABS in
  uncertain braking distance.
• see link of Figure 1,sheet 1.

6
Calculation from the given dataand the
conclusion of the computed results.

• Methods to calculate decelerations, parameters
  are
• velocities at the measurement points
• distance after taking the brake
• All the results is minus,

7
Comparison among different values

• For the same cars under the same conditions, the
  deceleration of cars with ABS is larger than the
  ones without.
• For the cars within uncertain braking distance,
  the deceleration of cars with ABS is bigger than
  the ones without.

8
Use statistical method to evaluate the values
confidence interval

• We know the mathematical equation of
• ? x ? T(n-1,?/2)S/ n0,5
• With the parameter t equal to 1,960, ? equal
  to 0.5, which belongs to a t-distribution.

9
Comparison among tires of various types studded
configuration

• Table 1. Cars with ABS in decided braking
  distance
• Table 2. Vehicles without ABS in certain distance
  
• Table 3. Cars with ABS within uncertain distance
  
• Table 4. Cars without ABS within uncertain
  distance
• See detailed information in link 2, table, and
  the diagram in Figure 1, sheet 3.

10
The influence from ABS on the deceleration
capability

• The ABS deceleration ratio (RdiABS) was
  calculated
• RdiABS Di (ABS)?Di (STD)
• The means are assumed to be t-distribution, so
  the standard error may be considered greater than
  a 1/4 confidence interval for the mean. Hence the
  deceleration enhancement with ABS may be
  considered statistically significant.

11
Performance of ABS in real world conditions

• The experiment conditions commanded
• The evaluation method for ABS with certain
  parameters.

12
Accident risk and driver education

• Problem nowadays among the drivers
• Due to the installation of ABS, imposing a higher
  expectation on ABS
• Lack of sensory experience
• The driving education should be emphasized

13
Speed selection and loss of control

• The relationship between two aspects
• Loss of control statistics
• Generally speaking, irrespective of the speed
  level, it seems safety relevant to determine the
  likeliness of such a possible maneuver leading to
  the loss of control

14
Problems coming with ABS

• As a result of technical aspects
• Resulted from human reasons
• External factors could also influence the
  vehicles performance

15
Conclusion

• Advantages of ABS
• Driving education should be strengthened
• THANK YOU FOR YOUR ATTENTION!!
• QUENTIONS??