CONTROL OF ACTIVE VEHICLE DEVICES DURING CORNERING

• US 20130079996A1
• 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 8,818,642 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 21/01 Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents electrical circuits for transmission of signals between steering wheel and the vehicle itself B60R16/027; for electrically actuating belt retractor locking means B60R22/343
• 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: B62D 15/021 Determination of steering angle
• 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

A method of triggering an active device of a vehicle at a pre-determined threshold comprises generating a steering wheel signal from steering angle rate of change of steering angle of the vehicle, the signal representing an advance in time in comparison to the steering wheel position and/or speed, and determining a conditioned vehicle lateral acceleration in dependence on the steering wheel signal and a measured vehicle lateral acceleration, the conditioned vehicle lateral acceleration being advanced in time in comparison with the measured vehicle lateral acceleration. An active device of the vehicle is triggered if the conditioned vehicle lateral acceleration exceeds a threshold lateral acceleration.

Claims

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

generating a steering signal from a steering angle and a rate of change of steering angle of the vehicle, said signal representing an advance in time in comparison to said steering angle;

determining a conditioned vehicle lateral acceleration in dependence on said steering signal and a measured vehicle lateral acceleration, said conditioned vehicle lateral acceleration being advanced in time in comparison with said measured vehicle lateral acceleration; and

triggering an active device of the vehicle if said conditioned vehicle lateral acceleration exceeds a threshold lateral acceleration.

2. The method of claim 1, wherein steering angle is represented by an angular departure from a reference position.

3. The method of claim 2, wherein the reference position is straight ahead.

4. The method of claim 2, wherein said steering angle is determined only if a minimum departure from the reference position is exceeded.

5. The method of claim 1, wherein said steering signal is determined from a look-up table.

6. The method of claim 1, wherein said steering signal is determined from an algorithm linking steering angle and rate of change of steering angle.

7. The method of claim 1, and including the steps of:

determining a modified vehicle lateral acceleration by reference to vehicle speed, and

determining said conditioned vehicle lateral acceleration by reference to said modified vehicle lateral acceleration.

8. The method of claim 1, wherein the method is implemented by using an electronic control module of a vehicle.

9. The method of claim 1, wherein the active device comprises one or more of:

a seat belt tensioner,

an active seat bolster, and

a deployable aerodynamic device.

10. The method of claim 1, comprising determining steering angle from an electronic signal of steering wheel angle.

11. The method of claim 10, comprising determining rate of change of steering angle from an electronic signal of steering wheel angle and an electronic clock signal.

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

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