Rollover judging device

• US 20050159864A1
• Filed: 12/21/2004
• Published: 07/21/2005
• Est. Priority Date: 01/16/2004
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Ide, Seiya, Ogata, Yoshihisa
• Granted Patent: US 7,236,864 B2
• Time in Patent Office: Days
• US Class Current: 701/38
• CPC Class Codes: B60R 2021/0018 Roll-over
• 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: B60R 21/0133 by integrating the amplitude of the input signal
• CPC Class Codes: B60T 2230/03 Overturn, rollover
• CPC Class Codes: B60T 8/172 Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters B60T8/17551 takes precedence

Abstract

In a rollover judging device for a vehicle, an acceleration differential value of an acceleration of a vehicle in a lateral direction is calculated. And a roll angle of the vehicle is calculated from a roll rate. Then, the acceleration differential value is compared with a predetermined value corresponding to respective roll angles, to judge a trip-type rollover of the vehicle.

Claims

1. A rollover judging device for a vehicle comprising:

a differential value calculating unit for differentiating an acceleration of the vehicle in the lateral direction to calculate an acceleration differential value; and

a trip-type rollover judging unit for making a rollover judgment on the basis of at least one of a roll rate and a roll angle achieved by integrating the roll rate, and at least the acceleration differential value, so that a possible trip-over of the vehicle, in which the vehicle rolls over after the vehicle sideslips, can be judged.

2. A rollover judging device to claim 1, wherein the trip-type rollover judging unit comprising:

a trip type judging circuit for judging whether the rollover type of the vehicle is the trip type, on the basis of at least one of the roll rate and the roll angle and at least one of the acceleration and the acceleration differential value; and

a mode judging circuit for making a rollover judgment in conformity with the mode of the trip type, on the basis of at least one of the roll rate and the roll angle and the acceleration differential value.

3. A rollover judging device to claim 2, wherein the trip-type rollover judging unit further comprising:

a speed calculating unit for integrating the acceleration to calculate a speed.

4. A rollover judging device to claim 2, wherein

the differential value calculating unit starts the calculation of the acceleration differential value, after the trip type judging circuit judges the trip type.

5. A rollover judging device to claim 1, wherein

the differential value calculating unit is constructed by one of a high pass filter and a differential calculator.

6. A rollover judging device to claim 1, further comprising:

a normal type rollover judging unit for making a rollover judgment on the basis of a roll rate and a roll angle of the vehicle.

7. A rollover judging device to claim 6, wherein

the rollover judgment of the normal type rollover judging unit and the rollover judgment of the trip type rollover judging unit is subjected to AND processing.

8. A rollover judging device to claim 6, wherein

a judgment threshold value for the rollover judgment of the normal type rollover judging unit is changed by the trip type rollover judging unit.

9. A rollover judging device to claim 1, wherein

the trip type rollover judging unit makes a rollover judgment by using an acceleration in the vertical direction of the vehicle.

10. A rollover judging device for a vehicle comprising:

a normal type rollover judging unit for making a rollover judgment on the basis of a roll rate and a roll angle of the vehicle;

a trip type judging circuit for judging whether the rollover type of the vehicle is the trip type, on the basis of the roll angle and an acceleration of the vehicle in a lateral direction;

a differential value calculating unit for calculating a acceleration differential value from the acceleration of the vehicle in the lateral direction; and

a mode judging circuit for making a rollover judgment in conformity with the mode of the trip type, on the basis of the roll angle and the acceleration differential value, so that a possible trip-over of the vehicle, in which the vehicle rolls over after the vehicle sideslips, can be judged.

11. A rollover judging device to claim 10, wherein

the differential value calculating unit starts the calculation of the acceleration differential value, after the trip type judging circuit judges the trip type.

12. A rollover judging device to claim 10, wherein

the trip type judging circuit outputs a signal to the differential value calculating unit, when the acceleration of the vehicle in the lateral direction is higher than a predetermined value corresponding to the respective roll angle of the vehicle, so that the differential value calculating unit starts the calculation of the acceleration differential value.

13. A rollover judging device to claim 10, wherein

the rollover judgment of the normal type rollover judging unit and the rollover judgment of the trip type rollover judging unit is subjected to AND processing.

14. A rollover judging device to claim 10, wherein

a judgment threshold value for the rollover judgment of the normal type rollover judging unit is changed by the trip type rollover judging unit.

15. A rollover judging device to claim 10, wherein

the mode judging circuit judges the possible trip-over of the vehicle, when the acceleration differential value exceeds a predetermined value corresponding to the respective roll angle of the vehicle.