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US 11,440,366 B1Granted
Frequency dependent pressure and/or flow fluctuation mitigation in hydraulic systems
AssigneeClearMotion, Inc.
InventorsColin Patrick O'Shea, Joseph Thomas Belter, Brian Alexander Selden
Life of this patent
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Abstract
Active suspension systems including actuators with combinations of accumulators and flow restrictions, as well as their methods of operation, are described. In some embodiments, methods and constructions for mitigating pump ripple and/or resonances between different hydraulic components are also described.
Claims15
An actuator comprising:
- a housing including a first volume and a second volume with a piston slidably disposed between the first volume and the second volume;
- a hydraulic device fluidly coupled to the first volume and the second volume along a first flow path extending between the first volume and the second volume, wherein in a first operating mode the hydraulic device operates in a first direction and in a second operating mode the hydraulic device operates in a second direction;
- an electric motor/generator operatively coupled to the hydraulic device;
- a first accumulator disposed along the first flow path between the hydraulic device and the first volume;
- a second accumulator disposed along the first flow path between the hydraulic device and the second volume;
- and
- at least one flow restriction located along the first flow path, wherein the at least one flow restriction is configured to damp a flow in the first flow path between the first accumulator and the second accumulator.
4 more elements
A vehicle comprising:
- an active suspension system including one or more actuators, wherein each actuator comprises:
- a housing including a first volume and a second volume with a piston slidably disposed between the first volume and the second volume;
- a hydraulic device fluidly coupled to the first volume and the second volume along a first flow path extending between the first volume in the second volume, wherein in a first operating mode the hydraulic device operates in a first direction and in a second operating mode the hydraulic device operates in a second direction;
- an electric motor/generator operatively coupled to the hydraulic device;
- a second flow path extending between the first volume and the second volume that bypasses the hydraulic device;
- and
- a valve that selectively permits flow through the second flow path based at least partly on the vehicle's speed, wherein the valve permits flow through the second flow path when the vehicle velocity is less than a threshold velocity and prevents flow through the second flow path when the vehicle velocity is greater than the threshold velocity.
4 more elements
Dependencies are inferred from the claim text.