Method for the Operation of a Single-Axle Roll Stabilization System of a Two-Axle, Double-Track Vehicle

• US 20080073864A1
• Filed: 11/20/2007
• Published: 03/27/2008
• Est. Priority Date: 08/09/2005
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: Webers, Klaus
• Granted Patent: US 7,472,003 B2
• Time in Patent Office: Days
• US Class Current: 280/5.506
• 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 21/0555 including an actuator inducing vehicle roll
• CPC Class Codes: B60G 2400/0511 Roll angle
• CPC Class Codes: B60G 2400/104 lateral or transversal with regard to vehicle
• CPC Class Codes: B60G 2400/204 Vehicle speed
• CPC Class Codes: B60G 2800/0122 Roll rigidity ratio; Warping

Abstract

An operating method for a single-axle roll stabilization system between the chassis and the body of a two-axle, double-track vehicle is provided, whereby energy for supporting a roll torque of the body may be introduced into the chassis via a controllable actuator, and the introduced stabilizing torque is represented as the product of a rigidity parameter and the roll angle or an alternative roll angle which corresponds to the roll angle with sufficient accuracy and is derived from a measurable variable, the rigidity parameter being freely selectable or adaptable in driving mode, depending on the travel speed of the vehicle. When the actuator is provided on the rear axle of the vehicle, the rigidity parameter, starting from a higher value, drops to lower values in a substantially monotonic manner with increasing travel speed, whereas the opposite applies for a front axle actuator.

Claims

1. An operating method for a single-axle roll stabilization system between a chassis and a body of a two-axle, double-track vehicle, whereby energy for supporting a roll torque of the body is introduced into the chassis via a controllable actuator,

wherein the actuator introduces a stabilizing torque which is opposed to the roll torque and which is substantially represented as a product of a rigidity parameter and either a roll angle or an alternative roll angle, which corresponds to the roll angle with sufficient accuracy, that is derived from a measurable variable, the rigidity parameter being freely selectable or adaptable in driving mode.

2. The operating method according to claim 1, wherein the rigidity parameter is a function of the travel speed of the vehicle.

3. The operating method according to claim 2, wherein the actuator is provided on the rear axle of the vehicle, and the rigidity parameter, starting from a higher value, drops to lower values in a substantially monotonic manner with increasing travel speed.

4. The operating method according to claim 2, wherein the actuator is provided on the front axle of the vehicle, and the rigidity parameter, starting from a lower value, rises to higher values in a substantially monotonic manner with increasing travel speed.

5. The operating method according to claim 1, wherein the actuator is an oscillating motor in a divided transverse stabilizer for the chassis.

6. The operating method according to claim 1, wherein the actuator is formed by two control elements in the left and right wheel suspension of the vehicle for reaching a base point displacement of a particular suspension spring.

7. The operating method according to claim 1, wherein the alternative roll angle is derived from the transverse acceleration of the vehicle.

8. The operating method according to claim 1, wherein, in a calculation of parameters of passive chassis stabilization elements performed to determine an actuator stabilization torque, nonlinear effects of said parameters may be incorporated.

9. The operating method according to claim 8, wherein, in the determination of the actuator stabilization torque, at least one additive or multiplicative correction term for taking into account a critical vehicle state is included.

10. A method for operating a single-axle roll stabilization system between a chassis and a body of a two-axle, double-track vehicle, whereby energy for supporting a roll torque of the body is introduced into the chassis via a controllable actuator, the method comprising the act of:

introducing into the chassis, via the controllable actuator, a stabilizing torque that is opposed to the roll torque,

wherein the stabilizing torque is a product of a rigidity parameter and either a roll angle or an alternative roll angle that is derived from a measurable variable, and

wherein the rigidity parameter is at least one of freely selectable and freely adaptable in driving mode.

11. The operating method according to claim 10, wherein the rigidity parameter is a function of the travel speed of the vehicle.

12. The operating method according to claim 11, wherein the actuator is provided on the rear axle of the vehicle, and the rigidity parameter, starting from a higher value, drops to lower values in a substantially monotonic manner with increasing travel speed.

13. The operating method according to claim 11, wherein the actuator is provided on the front axle of the vehicle, and the rigidity parameter, starting from a lower value, rises to higher values in a substantially monotonic manner with increasing travel speed.

14. The operating method according to claim 10, wherein the actuator is an oscillating motor in a divided transverse stabilizer for the chassis.

15. The operating method according to claim 10, wherein the actuator is formed by two control elements in the left and right wheel suspension of the vehicle for reaching a base point displacement of a particular suspension spring.

16. The operating method according to claim 10, wherein the alternative roll angle is derived from the transverse acceleration of the vehicle.

17. The operating method according to claim 10, wherein, in a calculation of parameters of passive chassis stabilization elements performed to determine an actuator stabilization torque, nonlinear effects of said parameters may be incorporated.

18. The operating method according to claim 17, wherein, in the determination of the actuator stabilization torque, at least one additive or multiplicative correction term for taking into account a critical vehicle state is included.

19. An apparatus for single-axle roll stabilization between a chassis and a body of a two-axle, double-track vehicle, comprising:

a controllable actuator configured to introduce into the chassis a stabilizing torque that is opposed to a roll torque of the body,

wherein the stabilizing torque is a product of a rigidity parameter and either a roll angle or an alternative roll angle that is derived from a measurable variable, and

wherein the rigidity parameter is at least one of freely selectable and freely adaptable in driving mode.

20. The apparatus of claim 19, wherein the actuator is an oscillating motor in a divided transverse stabilizer for the chassis.