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:
Jan. 28, 2014
Filed:
Dec. 27, 2011
Yasunori Ota, Tsuchiura, JP;
Satoshi Iwasaki, Kasumigaura, JP;
Yasunori Ota, Tsuchiura, JP;
Satoshi Iwasaki, Kasumigaura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
When temperature is low, a low-temperature mode is selected, followed by the activation of the heating mode functionalityof a PCU. Specifically, the PCUsets the ratio of energy recovered by a capacitorto be equal to or greater than the largest value of the energy recovery ratios of the capacitorin a normal mode (e.g., assist motor:capacitor=2:8). Thus, more energy is stored on the capacitorthan in the normal mode, helping the capacitorgenerates heat. As a result, the liquid temperature of the coolant is increased, and its viscosity is reduced accordingly. As above, the invention provides a simple cooling system to be mounted on a hybrid working machine, which is capable of preventing decreases in energy efficiency at low temperature.