METHOD AND DEVICE FOR OPERATING A CHASSIS

• US 20140039758A1
• Filed: 08/02/2013
• Published: 02/06/2014
• Est. Priority Date: 08/04/2012
• Status: Active Grant

• Current Assignee: Audi AG (Volkswagen AG)
• Original Assignee: Audi AG (Volkswagen AG)
• Inventors: Sawodny, Oliver, Schindler, Andreas, Ghrle, Christoph
• Granted Patent: US 8,762,000 B2
• Time in Patent Office: Days
• US Class Current: 701/37
• CPC Class Codes: B60G 17/0165 to an external condition, e.g. rough road surface, side wind
• CPC Class Codes: B60G 17/018 characterised by the use of a specific signal treatment or control method
• CPC Class Codes: B60G 2400/252 vertical
• CPC Class Codes: B60G 2400/821 Uneven, rough road sensing affecting vehicle body vibration
• CPC Class Codes: B60G 2400/823 Obstacle sensing
• CPC Class Codes: B60G 2500/10 Damping action or damper
• CPC Class Codes: B60T 8/1755 Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02

Abstract

In a method for operating an at least semi-active chassis of a vehicle, a height profile of a road course which lies ahead in driving direction of the vehicle is determined with at least one sensor unit and at least one actuating unit of the vehicle is proactively controlled with the control unit, wherein an actual obstacle of the road course, which is displayed in the determined height profile is assigned to one of multiple predefined and store categories and a predetermined control signal is transmitted to the at least actuating unit based on the assigned category, wherein the actuating unit executes the control signal.

Claims

1. A method for operating an at least semi-active chassis of a vehicle, comprising:

determining with at least one sensor unit a height-profile of a road course which lies ahead in a driving direction of the vehicle;

predefining multiple categories representative of respective potential obstacles that may be present on the road course as a function of respective geometric shapes of the potential obstacles, and storing the multiple categories;

assigning an actual obstacle of the road course which is displayed in the height profile to one of the multiple predefined and stored categories as a function of a geometric shape of the actual obstacle; and

proactively controlling with a control unit at least one actuating unit of the motor vehicle by transmitting to the at least one actuating unit a predetermined control signal assigned to the one of the multiple categories, thereby causing actuation of the actuating unit commensurate with the predetermined control signal, said predetermined control signal being calculated as a function of the respective potential obstacles of the predefined categories.

2. The method of claim 1, wherein the chassis is constructed as active chassis.

3. The method of claim 1, further comprising adjusting the predetermined control signal as a function of the geometric shape of the actual obstacle.

4. The method of claim 1, further comprising displaying the chassis of the vehicle in a virtual vehicle model, and simulating an effect of controlling the actuator by the actuating signal on the vehicle when driving over the actual obstacle, and in response thereto modifying the control of the actuator in response to the simulation so that at least one predeterminable criteria is satisfied, wherein by way of a simulation optimal actuating values are calculated to optimally compensating the actual obstacle.

5. The method of claim 1, wherein the at least one actuating unit is selected from at least one member of the group consisting of a spring mount, an adjustable damper, and a path adjustment between wheel and superstructure.

6. The method of claim 1, wherein the actual obstacle is an elevation on the road course, and wherein the proactively controlling of the at least one actuating unit causes a proactive lifting of the vehicle prior to driving over the elevation.

7. The method of claim 1, wherein the actual obstacle is an elevation on the road course, and wherein the proactively controlling of the at least one actuating unit causes a proactive retraction of wheels of the motor vehicle prior to driving over the elevation.

8. The method of claim 1, wherein the actual obstacle is a pothole on the road course, and wherein the proactively controlling of the at least one actuating unit causes a proactive one-sided retraction or lifting of front wheels and/or rear wheels of the vehicle when driving over the pothole.

9. A device for operating an at least semi-active chassis of a vehicle, said device comprising:

at least one sensor unit, configured to determine a height-profile of a driving course which lies ahead of the vehicle in a driving direction of the vehicle;

at least one actuating unit;

a control unit; and

a classification module coupled with the control unit and configured to establish and store multiple categories of respective potential obstacles which may be present on the driving course as a function of a respective geometric shape of the potential obstacles, and to assign a predetermined control signal to each of the multiple categories,

wherein the at least one sensor unit is configured to transmit the determined height profile to the control unit, and wherein the control unit is configured to proactively control the at least one actuating unit as a function of the determined height-profile by assigning an actual obstacle of the road course displayed in the determined height-profile to one of the multiple categories and transmitting the predetermined control signal assigned to the one of the categories to the at least one actuating unit, said respective predetermined control can being calculated as a function of the obstacles classified into the respective category.

10. The device of claim 9, wherein the actuating unit is coupled with the control unit and configured to execute the predetermined control signal transmitted by the control unit.

11. The device of claim 9 wherein the chassis is constructed as active chassis.

12. The device of of the claim 9, further comprising a calculating unit coupled with the control unit, said calculating unit being configured to display the chassis in a virtual vehicle model and to simulate an effect of the control of the actuator by the actuating signal on the vehicle when driving over the actual obstacle, and to modify the control of the actuator in response to the simulation so that at least one predetermined criteria is satisfied, wherein the simulation enables calculation of optimal actuating values to thereby optimally compensate the actual obstacle.

13. The device of claim 9, wherein the classification module is part of the control unit.

14. The device of claim 12, wherein the calculating unit is part of the control unit.

15. The device of claim 9, wherein the at least one actuating unit is selected from at least one member of the group consisting of spring mount, adjustable damper, and path adjustment between wheel and superstructure