The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 01, 2006
Filed:
Jul. 01, 2004
Chris Teslak, Plymouth, MI (US);
Ron Kepner, Ann Arbor, MI (US);
Peter Chalk, Storridge, GB;
Chuanchi Tang, Troy, MI (US);
Cliff Carlson, Fenton, MI (US);
Chris Teslak, Plymouth, MI (US);
Ron Kepner, Ann Arbor, MI (US);
Peter Chalk, Storridge, GB;
Chuanchi Tang, Troy, MI (US);
Cliff Carlson, Fenton, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
A system for transmitting power hydraulically to and from the wheels of a motor vehicle includes an accumulator containing fluid at relatively high pressure, a reservoir containing fluid at lower pressure, and a pump/motor driveably connected to the wheels and having a variable volumetric displacement for pumping fluid between the accumulator and the reservoir. A first circuit connects the inlet to the reservoir and the outlet to the accumulator. A second circuit includes a first path having a low flow rate capacity, a second path having a higher flow rate capacity. A controller switches between pumping operation and motoring operation, opens and closes the first path during motoring operation, and reduces the displacement before switching between pumping operation and motoring operation.