Esp presentation

ELECTRONIC STABILITY PROGRAM or ELECTRONIC STABILITY Control System

1. ELECTRONIC STABILITY PROGRAM The greatest safety invention after seat belts

2. What is ESP? A computerized technology that improves a vehicle's stability by detecting and reducing loss of traction

3. TRACTION A physical process in which a force is transmitted across an interface between two bodies through dry friction The grip of a tyre on a road

4. Factors affecting traction Material composition of each surface Macroscopic and microscopic texture Normal force pressing contact surfaces Contaminants at the material boundary, i.e. lubricants and adhesives Relative motion of tractive surfaces - a sliding object has less traction than a non-sliding object Direction of traction - e.g., cornering, accelerating, and braking.

5. Importance of Traction It allows for higher acceleration at cornering without wheel slippage Contact of wheels with ground increase stability

6. History of ESP First iteration in 1980 by BMW Mercedes steps in, in 1992 with supplier Bosch Toyota introduces Vehicle Stability Control (VSC) in 1995 General Motors begins introduces ESP in 1997 European Union makes ESP mandatory in 2009

7. Basic Physical Principles Tractive force Brake pressure Lateral force Adhesion force

8. Basic Physical Principles Yaw moment Wheel and inertia moments

9. Basic Physical Principles Concept of Friction Circle Radius of friction circle Resultant force

10. Inter-relationships between forces Total force within friction circle Low lateral force (s) Total force=Brake pressure

11. Components of ESP Steering wheel angle sensor Yaw rate sensor Lateral acceleration sensor Wheel speed sensor Longitudinal acceleration sensor Roll rate sensor

12. What does ESP do? It decides- 1. What wheel to brake or accelerate and to what extent, 2. Whether engine torque is reduced and 3. Whether the gearbox control unit is activated on vehicles with automatic gearbox.

13. How does ESP work? Speed sensors provide continous data Control units calculate desired steering action Lateral and Yaw sensors send information Calculates actual state of vehicle If actual and desired values don’t match, it intervenes Checks if intervention successful If yes, ends intervention If no, repeats intervention cycle

14. SENSORS/COMPONENTS Code Sensor name Location Function J104 Control unit Front right footwell Processing, monitoring, commanding G85 Steering angle sensor Between steering column and wheel Transfers steering wheel angle to control unit G200 Lateral acceleration sensor Below driver’s seat Determines action of lateral forces on stability G202 Yaw rate sensor Below driver’s seat Determines action of torque G201 Brake pressure sensor Connected to hydraulic pump Calculates wheel braking forces ---- Button for ESP Dashboard Switch ESPon /off

15. EFFECTIVENESS ESC reduces crashes by 35%- National Highway and Traffic Safety Administration, USA Upto 10,000 fatal US crashes could be avoided annually- US Institute for Highway Safety Improved vehicle handling reduces skids and rollovers Induces rider confidence

16. COST AND AVAILABILITY Available in Indian cars even under 10 lac rupees: Ford Ecosport 1.5 Hyundai i20 Renault Duster Hyundai Verna Nissan Micra

17. FUTURE SCOPE ESP to be mandated in Japan, Korea, Russia, and Turkey in the coming years Developing of newer algorithms to tackle problems like trailer sway , in the effect of vehicle towing

18. Then, now, and future India

19. CONCLUSION Life saving technology An aid to human, not a substitute to human Safe driving habits are must

20. References “Bosch InnoWaves ”, News and Information for Customers of Bosch Automotive Technology OE Sales & Marketing | Issue 20 | May 2014   “Electronic Stability Programme ”, Self-study Programme no. 204, 840.2810.23.20, Volkswagen Technologies  “Brief history of Electronic Stability System”, http://www.safetyresearch.net/blog/articles/brief-history-electronic-stability-controls-and-their-applications “Bosch predicts acceptance of ESP in Indian Vehicles” http://www.autocarpro.in/news-international/bosch-acceptance-esp-indian-vehicle-growing-percent-2021-6715  "Real world crash evaluation of vehicle stability control (VSC) technology", G. Bahouth .   "The Effectiveness of ESC (Electronic Stability Control) in Reducing Real Life Crashes and Injuries", Anders Lie, Claes Tingvall , Maria Krafft , and Anders Kullgren , of the 19th Enhanced Safety of Vehicles Conference, 2005 The Greatest Advance in Safety Since Seatbelts , retrieved 2007-12-28  "Traction Control System for Improved Driving Safety", SAE Technical Papers

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