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. 30, 2010
Filed:
May. 11, 2009
Keizo Shimada, Hitachi, JP;
Yasuhiro Kiyofuji, Hitachi, JP;
Naoshi Sugawara, Hitachi, JP;
Kazuhiro Imaie, Hitachi, JP;
Shintarou Oku, Hitachi, JP;
Takashi Yagyu, Ushiku, JP;
Keizo Shimada, Hitachi, JP;
Yasuhiro Kiyofuji, Hitachi, JP;
Naoshi Sugawara, Hitachi, JP;
Kazuhiro Imaie, Hitachi, JP;
Shintarou Oku, Hitachi, JP;
Takashi Yagyu, Ushiku, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
In an electric drive system for a vehicle, an alternator is driven by an engine to generate electric power which is used to drive a motor to generate a driving force. During a retardation of the vehicle, the motor is operated as an alternator to convert kinetic energy to electric energy which is used to retard the vehicle. A retard resistor is provided for absorbing electric energy generated during the retardation state. The retard resistor is cooled down by an AC blower.