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Formation Control
for Platoons of
Autonomous
Vehicles
Student : Chouaieb Nemri
Supervisor : Prof. Cédric Pradalier
OUTLINE
Introduction
State of the Art
Problem statement
Suggested control solution
Simulation Results
Conclusion
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
2
INTRODUCTION
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
3
INTRODUCTION
Safety Highway Capacity
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
4
Source : http://www.toyota-
global.com/innovation/intelligent_transport_systems/images/The_Future_of_Mobility.pdf
INTRODUCTION
Eco-friendly Less workforce
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
5
WHERE ARE
WE NOW?
Source : IHS
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
6
STATE OF THE ART
Control law based
on local/Global
platoon data?
Vehicle commands
computed on
central computer?
Platooning
Decentralized
Global Local
Centralized
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
7
Platooning approaches
STATE OF THE ART
 Accurate tracking.
 Depends on whole
convoy data.
 Communication delays
– Packet Loss – Data
processing and
transmission time
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
8
Centralized & Global decentralized architectures
STATE OF THE ART
• No communication
needed
• Based exclusively on
proprioceptive and
exteroceptive sensors
• Not as accurate as
Global or Centralized
approaches
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
9
Local decentralized architectures
PROBLEM STATEMENT
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
10
Lateral error propagation – proportional controller (video)
Lateral error gets
larger as we
consider later
Robots in the convoy
SUGGESTED CONTROL
SOLUTION
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
11
© Jano Yazbeck, Alexis Scheuer and François
Charpillet
Université de Lorraine, LORIA
Inria, MAIA team - FRANCE
SUGGESTED CONTROL
SOLUTION
Control Law
Longitudinal
SSC Proportional
Lateral
MemoLAT
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
12
Decoupling control components
SUGGESTED CONTROL
SOLUTION
A typical control loop
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
13
The Big Picture
Compute
Longitudinal
Control
Choose target and
Compute Later
Control
Apply
control
laws
Rebelotte
Aquire and save
predecessor’s
position
1 2
3
4
SUGGESTED CONTROL
SOLUTION
Middleware : ROS indigo
Simulation software : V-REP
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
14
Used simulation environment
SUGGESTED CONTROL
SOLUTION
IndivMarkersNoKinect
• Detects the alvar
markers and yields
their coordinates in the
camera frame
Tracker
• Adding new
points to the path
• Coordinate transform
from previous frame to
current frame
everytime we update
odometry
• Delete old points
Controller
Computes
and applies
contol laws
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
15
SUGGESTED CONTROL
SOLUTION
Tracker
•Sync_odo_cb : (left/right wheel encoders)
- Odometry
- Path coordinate transform
- delete old points
•Ar_cb : (AlvarMarkers)
- Coordinate transform from camera frame to robot frame
- add new point to path
Controller
•List_cb: (custom pointlists msg)
- Computes current distance from predecessor.
- Selects target point for MemoLAT
•control_cb : (Timer 10 ms)
- Longitudinal control : proportional law
- Lateral control : Modified MemoLAT (Video)
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
16
SUGGESTED CONTROL
SOLUTION
Limited camera’s angle of
view.
Robots get lost when miss
the AlvarMarkers
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
17
Solution : Combining 2 behaviours. MemoLAT & keeping the markers in the
visible zone. (cost : less accuracy)
w = alpha * keep_visible + (1-alpha) * MemoLAT
SIMULATION RESULTS
Improved accuracy (Videos)
Angular error as a function of time
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
18
SIMULATION RESULTS
Small d_l
• Small lateral
deviation.
• BUT creates
oscillation around
small curvature
paths
Large d_l
• Large lateral
deviation for high
curvature paths
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
19
Effect of establishment distance
We have no analytic relation in order to dynamically set a suitable value fo
CONCLUSION
 Platooning is awesome !
 Lateral and longitudinal controls can be decoupled
We suggested a high level controller. It is applicable to
all kind of mobile robots
Experimantal trials, setting dynamically the
establishment distance…
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
20
THANK YOU.
4/27/2015
CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS
VEHICLES
21
Questions ?

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Fornation Control of Platoons of Autonomous Vehicles

  • 1. Formation Control for Platoons of Autonomous Vehicles Student : Chouaieb Nemri Supervisor : Prof. Cédric Pradalier
  • 2. OUTLINE Introduction State of the Art Problem statement Suggested control solution Simulation Results Conclusion 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 2
  • 3. INTRODUCTION 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 3
  • 4. INTRODUCTION Safety Highway Capacity 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 4 Source : http://www.toyota- global.com/innovation/intelligent_transport_systems/images/The_Future_of_Mobility.pdf
  • 5. INTRODUCTION Eco-friendly Less workforce 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 5
  • 6. WHERE ARE WE NOW? Source : IHS 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 6
  • 7. STATE OF THE ART Control law based on local/Global platoon data? Vehicle commands computed on central computer? Platooning Decentralized Global Local Centralized 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 7 Platooning approaches
  • 8. STATE OF THE ART  Accurate tracking.  Depends on whole convoy data.  Communication delays – Packet Loss – Data processing and transmission time 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 8 Centralized & Global decentralized architectures
  • 9. STATE OF THE ART • No communication needed • Based exclusively on proprioceptive and exteroceptive sensors • Not as accurate as Global or Centralized approaches 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 9 Local decentralized architectures
  • 10. PROBLEM STATEMENT 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 10 Lateral error propagation – proportional controller (video) Lateral error gets larger as we consider later Robots in the convoy
  • 11. SUGGESTED CONTROL SOLUTION 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 11 © Jano Yazbeck, Alexis Scheuer and François Charpillet Université de Lorraine, LORIA Inria, MAIA team - FRANCE
  • 12. SUGGESTED CONTROL SOLUTION Control Law Longitudinal SSC Proportional Lateral MemoLAT 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 12 Decoupling control components
  • 13. SUGGESTED CONTROL SOLUTION A typical control loop 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 13 The Big Picture Compute Longitudinal Control Choose target and Compute Later Control Apply control laws Rebelotte Aquire and save predecessor’s position 1 2 3 4
  • 14. SUGGESTED CONTROL SOLUTION Middleware : ROS indigo Simulation software : V-REP 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 14 Used simulation environment
  • 15. SUGGESTED CONTROL SOLUTION IndivMarkersNoKinect • Detects the alvar markers and yields their coordinates in the camera frame Tracker • Adding new points to the path • Coordinate transform from previous frame to current frame everytime we update odometry • Delete old points Controller Computes and applies contol laws 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 15
  • 16. SUGGESTED CONTROL SOLUTION Tracker •Sync_odo_cb : (left/right wheel encoders) - Odometry - Path coordinate transform - delete old points •Ar_cb : (AlvarMarkers) - Coordinate transform from camera frame to robot frame - add new point to path Controller •List_cb: (custom pointlists msg) - Computes current distance from predecessor. - Selects target point for MemoLAT •control_cb : (Timer 10 ms) - Longitudinal control : proportional law - Lateral control : Modified MemoLAT (Video) 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 16
  • 17. SUGGESTED CONTROL SOLUTION Limited camera’s angle of view. Robots get lost when miss the AlvarMarkers 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 17 Solution : Combining 2 behaviours. MemoLAT & keeping the markers in the visible zone. (cost : less accuracy) w = alpha * keep_visible + (1-alpha) * MemoLAT
  • 18. SIMULATION RESULTS Improved accuracy (Videos) Angular error as a function of time 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 18
  • 19. SIMULATION RESULTS Small d_l • Small lateral deviation. • BUT creates oscillation around small curvature paths Large d_l • Large lateral deviation for high curvature paths 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 19 Effect of establishment distance We have no analytic relation in order to dynamically set a suitable value fo
  • 20. CONCLUSION  Platooning is awesome !  Lateral and longitudinal controls can be decoupled We suggested a high level controller. It is applicable to all kind of mobile robots Experimantal trials, setting dynamically the establishment distance… 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 20
  • 21. THANK YOU. 4/27/2015 CHOUAIEB NEMRI – FORMATION CONTROL FOR PLATOONS OF AUTONOMOUS VEHICLES 21 Questions ?