Apparatus and method for active vehicle suspension
Method and apparatus for improving the performance, response, and durability of an electro-hydraulic active suspension system. The noise caused by hydraulic flow ripple is reduced and system response is improved.
1. A method of noise mitigation for an active suspension system of a vehicle, the method comprising:
(a) obtaining, via one or more sensors on the vehicle, noise data or vibration data;
(b) obtaining operating parameters of a hydraulic motor-pump of the active suspension system;
(c) determining, based on the operating parameters of the hydraulic motor-pump and at least one of the noise data or vibration data, a noise-cancelling audible sound to be provided by a speaker; and
(d) operating the speaker to produce the noise-cancelling audible sound.
2. The method of claim 1 , further comprising attenuating noise in the vehicle using active or passive vibration dampers.
3. The method of claim 1 , wherein the operating parameters of the hydraulic motor-pump comprise an instantaneous torque produced or absorbed by the hydraulic motor pump.
4. The method of claim 1 , wherein the operating parameters of the hydraulic motor-pump comprise an angular speed or position of the hydraulic motor-pump.
5. The method of claim 1 , wherein the operating parameters of the hydraulic motor-pump are used in conjunction with a transfer function of a body of the vehicle to determine the noise-cancelling audible sound for the speaker.
6. The method of claim 1 , wherein the one or more sensors comprises one or more microphones.
7. The method of claim 1 , wherein the one or more sensors comprises an accelerometer.
8. The method of claim 1 , wherein the hydraulic motor-pump comprises a gerotor.
9. A noise mitigation system for a vehicle, the system comprising:
an active suspension system comprising a hydraulic motor-pump, the hydraulic motor pump having one or more operating parameters;
one or more sensors configured to sense at least one of noise or vibration;
a speaker disposed in the vehicle; and
a controller configured to operate the speaker based on the one or more operating parameters of the hydraulic motor pump.
10. The noise mitigation system of claim 9 , wherein the one or more sensors comprises one or more microphones.
11. The noise mitigation system of claim 9 , wherein the one or more sensors comprises an accelerometer.
12. The noise mitigation system of claim 9 , wherein the one or more operating parameters of the hydraulic motor-pump comprise an instantaneous torque produced or absorbed by the hydraulic motor pump.
13. The noise mitigation system of claim 9 , wherein the one or more operating parameters of the hydraulic motor-pump comprise an angular speed or position of the hydraulic motor-pump.
14. The noise mitigation system of claim 9 , wherein the controller is further configured to operate the speaker based on a transfer function of a body of the vehicle.
15. The noise mitigation system of claim 9 , wherein the hydraulic motor-pump comprises a gerotor.