Process for determining lateral overturning of vehicle

• US 6,611,784 B2
• Filed: 03/15/2001
• Issued: 08/26/2003
• Est. Priority Date: 03/17/2000
• Status: Expired due to Term

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Maeda, Hiroyuki, Tobaru, Shigeo, Takahata, Osamu
• Primary Examiner(s): Barlow, John
• Assistant Examiner(s): PRETLOW, DEMETRIUS R
• Application Number:
  US09/809,747
• Publication Number:
  US 20010029438A1
• Time in Patent Office: 894 Days
• Field of Search: 702/150, 702/151, 701/1, 701/82, 701/45, 701/70, 340/429, 340/440
• US Class Current: 702/151
• CPC Class Codes: B60G 2800/9124 Roll-over protection systems, e.g. for warning or control
• CPC Class Codes: B60R 16/0234 related to maintenance or repairing of vehicles
• CPC Class Codes: B60W 40/11 Pitch movement
• CPC Class Codes: B60W 40/112 Roll movement
• CPC Class Codes: B60W 40/114 Yaw movement

Abstract

A process for determining lateral overturning of a vehicle in which a threshold value line is established separating a lateral overturning region farther from an origin and a lateral non-overturning region closer to the origin on a two-dimensional map made using a rolling angle θ and a rolling angular speed ω of the vehicle as parameters. When a hysteresis line for actual rolling angles and actual rolling angular speeds of the vehicle traverses the threshold value line from the lateral non-overturning region to the lateral overturning region, it is determined that there is a possibility of lateral overturning of the vehicle. When the rolling angular speed ω of the vehicle is increased sharply after the rolling angle θ has reached a fully bumping rolling angle θFB while the rolling angular speed ω was decreased, it is determined that the vehicle is in a state in which the lateral overturning due to a rolling resonance phenomenon is liable to occur, whereby the threshold value line S is moved toward the origin.

Claims

1. A process for determining the lateral overturning of a vehicle, comprising the step of establishing a threshold value line separating a lateral overturning region farther from an origin and a lateral non-overturning region closer to the origin on a two-dimensional map made using a rolling angle and a rolling angular speed of the vehicle as parameters, so that when a hysteresis line for actual rolling angles and actual rolling angular speeds of the vehicle traverses said threshold value line from the lateral non-overturning region to the lateral overturning region, it is determined that there is a possibility of lateral overturning of the vehicle, and wherein when the rolling angular speed is increased after the rolling angle has reached a fully-bumping rolling angle while the rolling angular speed was decreased, said threshold value line is moved toward the origin.

2. A process for determining the lateral overturning of a vehicle according to claim 1, further including the steps of:

establishing a data-storing region adjacent said threshold value line in the lateral non-overturning region, and when said hysteresis line has entered into said data-storing region, said hysteresis line is stored.

3. A process for determining the lateral overturning of a vehicle according to claim 2, wherein when said hysteresis line has entered into said data-storing region, a portion of said hysteresis line in said data storage region is stored.

4. A process for determining the lateral overturning of a vehicle, comprising the step of establishing a threshold value line separating a lateral overturning region farther from an origin and a lateral non-overturning region closer to the origin on a two-dimensional map made using a rolling angle and a rolling angular speed of the vehicle as parameters, so that when a hysteresis line for actual rolling angles and actual rolling angular speeds of the vehicle traverses said threshold value line from the lateral non-overturning region to the lateral overturning region, it is determined that there is a possibility of lateral overturning of the vehicle, wherein a data-storing region adjacent the threshold value line is established in the lateral non-overturning region, and when said hysteresis line has entered into said data-storing region, said hysteresis line is stored.

5. A process for determining the lateral overturning of a vehicle according to claim 4, wherein when said hysteresis line has entered into said data-storing region, a portion of said hysteresis line in said data storage region is stored.

6. A process for determining the lateral overturning of a vehicle, comprising the step of establishing a threshold value line separating a lateral overturning region farther from an origin and a lateral non-overturning region closer to the origin on a two-dimensional map made using a rolling angle and a rolling angular speed of the vehicle as parameters, so that when a hysteresis line for actual rolling angles and actual rolling angular speeds of the vehicle traverses said threshold value line from the lateral non-overturning region to the lateral overturning region, it is determined that there is a possibility of lateral overturning of the vehicle, and wherein said threshold value line is moved in accordance with at least one of a differentiation value of the rolling angular speed with regard to the rolling angle and a time-differentiation value of the rolling angular speed.

7. A process for determining the lateral overturning of a vehicle according to claim 6, wherein said threshold value line is moved in accordance with the time-differentiation value of the rolling angular speed.

8. A process for determining the lateral overturning of a vehicle according to claim 6, wherein said threshold value line is moved in accordance with the differentiation value of the rolling angular speed with regard to the rolling angle.

9. A process for determining the lateral overturning of a vehicle according to claim 6, further including the steps of:

establishing a data-storing region adjacent said threshold value line in the lateral non-overturning region, and when said hysteresis line has entered into said data-storing region, said hysteresis line is stored.

10. A process for determining the lateral overturning of a vehicle according to claim 9, wherein when said hysteresis line has entered into said data-storing region, a portion of said hysteresis line in said data storage region is stored.

11. A process for determining the lateral overturning of a vehicle, comprising the step of establishing a threshold value line separating a lateral overturning region farther from an origin and a lateral non-overturning region closer to the origin on a two-dimensional map made using a rolling angle and a rolling angular speed of the vehicle as parameters, so that when a hysteresis line for actual rolling angles and actual rolling angular speeds of the vehicle traverses said threshold value line from the lateral non-overturning region to the lateral overturning region, it is determined that there is a possibility of a lateral overturning of the vehicle, and wherein when it is determined that the vehicle is in a condition such that said lateral overturning of the vehicle is very likely to occur, said threshold value line is moved toward the origin.

12. A process for determining the lateral overturning of a vehicle according to claim 11, wherein it is determined that the vehicle is in a condition where said lateral overturning of the vehicle is very likely to occur when the rolling angular speed is increased after the rolling angle has reached a fully-bumping rolling angle while the rolling angular speed was decreased.

13. A process for determining the lateral overturning of a vehicle according to claim 11, wherein it is determined that the vehicle is in a condition where said lateral overturning of the vehicle is very likely to occur when a differentiation value of the rolling angular speed with regard to the rolling angle exceeds a predetermined large value.

14. A process for determining the lateral overturning of a vehicle according to claim 11, wherein it is determined that the vehicle is in a condition where said lateral overturning of the vehicle is very likely to occur when a time-differentiation value of the rolling angular speed exceeds a predetermined large value.

15. A process for determining the lateral overturning of a vehicle according to claim 11, further including the steps of:

establishing a data-storing region adjacent said threshold value line in the lateral non-overturning region, and when said hysteresis line has entered into said data-storing region, said hysteresis line is stored.

16. A process for determining the lateral overturning of a vehicle according to claim 15, wherein when said hysteresis line has entered into said data-storing region, a portion of said hysteresis line in said data storage region is stored.