Rollover warning and detection method for transport vehicles

• US 20070027596A1
• Filed: 08/01/2005
• Published: 02/01/2007
• Est. Priority Date: 08/01/2005
• Status: Active Grant

• Current Assignee: Invensense Incorporated (TDK Corporation)
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Schubert, Peter, Stavroff, Brian
• Granted Patent: US 7,477,972 B2
• Time in Patent Office: Days
• US Class Current: 701/38
• CPC Class Codes: B60G 17/0162 mainly during a motion involving steering operation, e.g. cornering, overtaking B60G17/0164 takes precedence
• CPC Class Codes: B60G 17/0195 characterised by the regulation being combined with other vehicle control systems conjoint control of vehicle sub-units including control of suspension systems B60W10/22
• CPC Class Codes: B60G 2300/0262 Multi-axle trucks
• CPC Class Codes: B60G 2300/042 Semi-trailers
• CPC Class Codes: B60G 2400/61 Load distribution
• CPC Class Codes: B60G 2400/63 Location of the center of gravity
• CPC Class Codes: B60G 2600/044 Alarm means
• CPC Class Codes: B60G 2800/012 Rolling condition
• CPC Class Codes: B60G 2800/0124 Roll-over conditions
• CPC Class Codes: B60G 2800/702 Improving accuracy of a sensor signal
• CPC Class Codes: B60G 2800/9124 Roll-over protection systems, e.g. for warning or control
• CPC Class Codes: B60W 30/04 related to roll-over prevention

Abstract

A rollover warning and detection method for a transport vehicle is adaptively adjustable to take into account the CG height of the vehicle. Measures of the vehicle speed, lateral acceleration and yaw rate are sampled during normal driving conditions and used to estimate the CG height of the vehicle. The centrifugal acceleration acting on the vehicle is calculated as the product of vehicle speed and yaw rate, and the CG height is estimated based on the relationship between the calculated centrifugal acceleration and the measured lateral acceleration. The estimated CG height of the vehicle is used to adjust various calibrated rollover detection thresholds so that algorithm outputs such as rollover warnings automatically take into consideration vehicle loading effects.

Claims

1. A rollover detection method for a transport vehicle, comprising the steps of:

determining a CG height of said vehicle;

detecting an impending rollover event based on comparison of a rollover-related parameter to a calibrated threshold; and

adapting the detection of said impending rollover event to account for vehicle loading conditions when the estimated CG height is higher or lower than a predetermined height.

2. The method of claim 1, where the detection of said impending rollover event is adapted to increase a likelihood of rollover detection when the estimated CG height is higher than the predetermined height.

3. The method of claim 2, including the step of:

decreasing said calibrated threshold to increase the likelihood of rollover detection.

4. The method of claim 1, where the detection of said impending rollover event is adapted to decrease a likelihood of rollover detection when the estimated CG height is lower than the predetermined height.

5. The method of claim 4, including the step of:

increasing said calibrated threshold to decrease the likelihood of rollover detection.

6. The method of claim 1, including the steps of:

determining a centrifugal acceleration acting on said vehicle;

measuring a lateral acceleration of said vehicle;

estimating said CG height based on the determined centrifugal acceleration and the measured lateral acceleration.

7. The method of claim 6, including the steps of:

measuring a yaw or steering rate of said vehicle;

measuring a speed of said vehicle; and

determining said centrifugal acceleration based on the measured yaw or steering rate and the measured speed.

8. The method of claim 7, where said vehicle includes a tractor coupled to a trailer, the method including the steps of:

measuring said yaw rate with respect to a longitudinal axis of said tractor; and

measuring said lateral acceleration with respect to a longitudinal axis of said trailer.

9. The method of claim 6, including the steps of:

establishing baseline relationships between the determined centrifugal acceleration and the measured lateral acceleration for different CG heights of said vehicle;

periodically determining a current relationship between the determined centrifugal acceleration and the measured lateral acceleration; and

estimating the CG height of said vehicle based on the determined current relationship and the established baseline relationships.

10. The method of claim 9, including the steps of:

determining a confidence metric based on a conformance of said current relationship to a predetermined curve; and

adapting the detection of said impending rollover event based on the estimated CG height and the confidence metric.

11. The method of claim 1, including the step of:

activating a warning on detection of said impending rollover event; and

transmitting a notification of said warning to a remote location.