Active suspension damping
Example illustrations are directed to a damping system for a vehicle suspension that includes a controller configured to determine a roughness of a ground surface associated with the vehicle. The controller is also configured to determine a damper setting for the damping system based on the determined roughness. A method is also provided that includes determining, using a controller, a roughness of a ground surface associated with the vehicle. The method may further include determining, using the controller, a damper setting of the vehicle based on the determined roughness.
1. A damping system for suspension of a vehicle, comprising:
a controller configured to:
determine a corner height error based on a difference between an actual corner height and an expected corner height;
apply a filter to the corner height error to generate a filtered corner height error, wherein the filter is based on a speed of the vehicle;
determine a roughness of a ground surface associated with the vehicle based on the filtered corner height error; and
determine a damper setting for the damping system based on the determined roughness.
2. The damping system of claim 1 , wherein the damper setting decreases a reaction force of a damper in response to an increase in the roughness.
3. The damping system of claim 1 , wherein the controller is configured to alter a gain of the controller based upon a ride height of the vehicle.
4. The damping system of claim 1 , wherein the controller is configured to increase a reaction force of a damper based on the damper approaching an end of travel of the damper.
5. The damping system of claim 1 , wherein the controller is configured to advance a force request to an opposing chamber of a damper based on the damper approaching an end of travel of the damper.
6. The damping system of claim 1 , wherein the damper setting is altered by changing a current supplied to a damper.
7. The damping system of claim 1 , wherein the determined roughness comprises a numerical value corresponding to a percentage from 0 to 100%.
8. The damping system of claim 1 , wherein the roughness is determined based on a change in the filtered corner height error over a time period corresponding to the ground surface traversed during the time period.
9. The damping system of claim 1 , further comprising an air suspension subsystem, wherein the controller is a vehicle dynamics module further configured to control a ride height of the vehicle via the air suspension subsystem.
10. The damping system of claim 1 , further comprising one or more dampers of the vehicle, wherein the one or more dampers are actuated by the controller.
11. The damping system of claim 1 , wherein the controller is configured to return the damper setting to a nominal value based upon a detection of a decrease in the roughness.
12. The damping system of claim 1 , wherein the controller is further configured to:
determine a gain based on the speed of the vehicle; and
determine the damper setting further based on the gain.
13. A method, comprising:
determining, using a controller, a corner height error based on a difference between an actual corner height and an expected corner height of a vehicle;
applying, using the controller, a filter to the corner height error to generate a filtered corner height error, wherein the filter is based on a speed of the vehicle;
determining, using the controller, a roughness of a ground surface associated with the vehicle based on the filtered corner height error; and
determining, using the controller, a damper setting of the vehicle based on the determined roughness.
14. The method of claim 13 , further comprising decreasing a reaction force of a damper in response to an increase in the roughness.
15. The method of claim 13 , further comprising altering a gain of the controller based upon a ride height of the vehicle.
16. The method of claim 13 , further comprising increasing a reaction force of a damper based on the damper approaching an end of travel of the damper.
17. The method of claim 13 , further comprising advancing a force request to an opposing chamber of a damper based on the damper approaching an end of travel of the damper.
18. The method of claim 13 , further comprising returning the damper setting to a nominal value based upon a detection of a decrease in the determined roughness.
19. The method of claim 13 , further comprising:
determining a gain based on the speed of the vehicle; and
determining the damper setting further based on the gain.
20. A non-transitory computer-readable medium having non-transitory computer-readable instructions encoded thereon that, when executed by a processor, cause the processor to:
determine a corner height error based on a difference between an actual corner height and an expected corner height of a vehicle;
apply a filter to the corner height error to generate a filtered corner height error, wherein the filter is based on a speed of the vehicle;
determine a roughness of a ground surface associated with the vehicle based on the filtered corner height error; and
determine a damper setting of the vehicle based on the determined roughness.