METHOD AND APPARATUS OF TRIGGERING AN ACTIVE DEVICE OF A VEHICLE

• US 20130079997A1
• Filed: 03/29/2012
• Published: 03/28/2013
• Est. Priority Date: 03/29/2011
• Status: Active Grant

• Current Assignee: Jaguar Land Rover Limited (TATA Motors Limited)
• Original Assignee: Jaguar Cars Limited (TATA Motors Limited)
• Inventors: Bunker, Paul
• Granted Patent: US 9,275,008 B2
• Time in Patent Office: Days
• US Class Current: 701/46
• CPC Class Codes: B60R 2021/01252 Devices other than bags
• CPC Class Codes: B60R 2021/01272 Belt tensioners
• CPC Class Codes: B60R 2021/01313 monitoring the vehicle steering system or the dynamic control system
• CPC Class Codes: B60R 2021/01327 Angular velocity or angular acceleration
• CPC Class Codes: B60R 21/0132 responsive to vehicle motion parameters , e.g. to vehicle longitudinal or transversal deceleration or speed value
• CPC Class Codes: B60T 2230/03 Overturn, rollover
• CPC Class Codes: G06F 17/00 Digital computing or data processing equipment or methods, specially adapted for specific functions information retrieval, database structures or file system structures therefor G06F16/00

Abstract

An active device of a vehicle, for example a seat belt tensioner, is triggered by reference to an estimated vehicle roll rate exceeding a threshold roll rate. The estimated vehicle roll rate may be conditioned according to vehicle speed, and is determined from inputs of vehicle lateral acceleration, steering wheel angle, and steering wheel speed.

Claims

1. A method of triggering an active device of a vehicle, the method comprising:

providing a first input of lateral acceleration of the vehicle;

providing a second input of steering angle;

providing a third input of rate of change of steering angle;

determining an estimated vehicle roll rate from said first, second and third inputs; and

triggering an active device of the vehicle if the estimated vehicle roll rate exceeds a threshold roll rate.

2. A method according to claim 1, whereby said estimated vehicle roll rate is determined from an algorithm directly associating said first, second and third inputs.

3. A method according to claim 1, whereby said estimated vehicle roll rate is determined from a look-up table directly associating said first, second and third inputs.

4. A method according to claim 1 and having a plurality of threshold roll rates, the active device being triggered differently as successive threshold roll rates are exceeded.

5. A method according to claim 4, whereby different threshold roll rates are associated with one or more of:

a different applied load of said active device;

a different rate of applying a load associated with said active device;

a different speed of movement of said active device; and

a different rate of change of speed of said active device.

6. A method accordingly to claim 1, and further including the step of conditioning said estimated vehicle roll rate by reference to vehicle speed, said active device being triggered if a threshold roll rate is exceeded by the conditioned estimated vehicle roll rate.

7. A method according to claim 6, whereby said conditioned estimated vehicle roll rate is determined from an algorithm associating said estimated vehicle roll rate with vehicle speed.

8. A method according to claim 6, whereby said conditioned estimated vehicle roll rate is determined from a look-up table associating said estimated vehicle roll rate with vehicle speed.

9. A method according to claim 1, whereby triggering an active device is associated with one or both of:

a seat belt tensioner and

a seat bolster.

10. A method of claim 1 implemented in an electronic control unit of said vehicle having sensors providing electrical signals indicative of lateral vehicle acceleration, steering wheel angle and vehicle speed, and said electronic control unit further having a clock reference for use in determining rates of change of said signals.

11. A system for a vehicle adapted to perform the method of claim 1.

12. A vehicle having a system as claimed in claim 11.