This presentation discusses anti-rollover technology incorporated in cars. Physics behind a car rollover, companies who have this technology. Also. various tests conducted to test rollover of a vehicle.

1. ACTIVE ROLLOVER
PROTECTION
(ARP)
P R E S E N TAT I O N D O N E BY,
T H U S H A R P. S

2. WHAT IS ARP??
• An active rollover protection or prevention (ARP), is a
system that recognizes impending rollover and selectively
applies brakes to resist.
• Additional feature of ESP which functions properly using ABS,
TCS, Yaw control.

3. TIMELINE OF ARP
Patented the first
‘Roll-over Protection
System’ in 2002
Roll-Over Mitigation
System was first
integrated with ESP
Patented a Low Cost
ARP

4. PHYSICS BEHIND A ROLLOVER
• ℎ 𝑅 should be minimum as possible.
• Usually SUVs have a greater value.

5. DYNAMICS OF A ROLLOVER
• STATIC STABILITY FACTOR (SSF)
SSF is defined as the track width divided by twice the center of gravity height; i.e., SSF
= T/2H.
Sum of lateral forces should be greater than product of weight of vehicle and SSF.
From Newton’s Laws of Motion :
Based on above relations we get :
Consider a slippery or very rough surface.
If µ is relatively low, as on a wet or icy road, the vehicle will slide rather than roll because
the lateral forces will be small, and the lateral accelerations will be far less than T/2H.

6. CONTD..
• CRITICAL SLIDING VELOCITY (CSV)
CSV is an estimate of the minimum sideways velocity required for a vehicle to just
barely tip over as a result of sliding sideways into a curb.
• TILT TABLE RATIO (TTR)
TTR is the tangent of the angle of the table when the front and rear wheels on the
uphill side of the vehicle first lift up

7. STATIC ROLLOVER TESTS
• Side Pull Test
• Centrifuge Test

8. LAYOUT OF ARP

9. SCHEMATIC WORKING OF ARP

10. FORD’S ARP TECHNOLOGY
• Uses a single integrated algorithm to determine whether the vehicle will encounter a
rollover or not.
• ARP function is activated by signals from wheel speed sensor, steering angle sensor
and lateral sensor.
• ARP maintains vehicle position by varying each wheel’s braking power.

11. CARS EQUIPPED WITH ROLLOVER
PROTECTION
₹ 55.9
lakhs
₹ 18 lakhs₹ 8 lakhs

12. THANK YOU!!