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Hydraulic energy transfer

  • US 9,597,939 B2
  • Filed: 01/06/2016
  • Issued: 03/21/2017
  • Est. Priority Date: 04/17/2008
  • Status: Active Grant
First Claim
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1. A shock absorber system of a vehicle, comprising:

  • a housing that includes a compression volume and an extension volume;

    a piston disposed in the housing that in a first mode moves through at least a portion of a compression stroke-and that in a second mode moves through at least a portion of an extension stroke;

    a hydraulic device which is one of a hydraulic motor and a hydraulic pump, wherein the hydraulic device includes a shaft, a first port and a second port, wherein the first port is in fluid communication with the compression volume and the second port is in fluid communication with the extension volume;

    a reservoir having a reservoir volume that receives fluid from at least one of the compression volume and the extension volume;

    a valve that controls at least a portion of fluid flow to or from at least one of the compression volume and the extension volume; and

    a controller associated with the hydraulic device, wherein the controller operates the hydraulic device at least at two different shaft velocities based on changes in driving conditions.

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