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:
Nov. 15, 2011
Filed:
Nov. 21, 2006
Kenji Kakizawa, Tsuchiura, JP;
Gen Yasuda, Tsuchiura, JP;
Kenji Kakizawa, Tsuchiura, JP;
Gen Yasuda, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
To permit a precise and easy adjustment of a pump absorption torque of a main pump in accordance with environmental conditions when a sub-pump different in characteristics from the main pump is connected to a prime mover. A main controllerincludes a processor means for setting the level of an absorption torque of a cooling fan pumpat a maximum absorption torque in use, a processor means for incrementing an adjustment target absorption torque for a main pumpat a slow rate from a sufficiently small pump absorption torque, and a processor means for repeating loading of a load factor signal and the increment of the adjustment target absorption torque as long as 'NO' is determined by a fourth determination means, and a processor means for storing the adjustment target absorption torque as an adjustment value when 'YES' has been determined by the fourth determination means.