Hydraulic actuator with a frequency dependent relative pressure ratio
AssigneeClearMotion, Inc.
InventorsJoseph Thomas Belter, Graham A. Dowie, Marco Giovanardi, Brian Alexander Selden
Life of this patent
Estimating the term…
Abstract
Disclosed herein are hydraulic actuators and methods for the operation of actuators having variable relative pressure ratios. Further disclosed are methods for designing and/or operating a hydraulic actuator such that the actuator exhibits a variable relative pressure ratio. In certain embodiments, the relative pressure ratio of the hydraulic actuator may be dependent on one or more characteristics (such as, for example, frequency or rate of change) of an oscillating input to the hydraulic actuator.
Claims21
1-25. (canceled)
A method of operating a hydraulic actuator, the method comprising:
- exposing the hydraulic actuator to a first oscillating input, the hydraulic actuator exhibiting a first relative compliance factor when exposed to the first oscillating input;
- exposing the hydraulic actuator to a second oscillating input, the hydraulic actuator exhibiting a second relative compliance factor when exposed to the second oscillating input, wherein the frequency of the first oscillating input is less than the frequency of the second oscillating input, and
- wherein the first relative compliance factor is greater than the second relative compliance factor.
An active suspension system of a vehicle, the active suspension system comprising:
- a hydraulic actuator comprising a restriction element, the hydraulic actuator being configured to exhibit a first relative compliance factor when exposed to a first oscillating input, and a second relative compliance factor when exposed to a second oscillating input, wherein:
- the frequency of the first oscillating input is less than the frequency of the second oscillating input, and
- the first relative compliance factor is greater than the second relative compliance factor;
- and
- one or more controllers configured to:
- receive information from one or more look ahead sensors on the vehicle,
- determine a characteristic of an expected input based on the received information, and
- adjust the restriction element of the hydraulic actuator based on the characteristic.
Dependencies are inferred from the claim text.