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:
Oct. 09, 2007
Filed:
Apr. 02, 2004
Kazuo Tahara, Hitachi, JP;
Keisuke Nishidate, Hitachi, JP;
Kenichi Yoshida, Hitachinaka, JP;
Hisaya Shimizu, Hitachinaka, JP;
Toshiyuki Innami, Mito, JP;
Shinichi Fujino, Mito, JP;
Kazuo Tahara, Hitachi, JP;
Keisuke Nishidate, Hitachi, JP;
Kenichi Yoshida, Hitachinaka, JP;
Hisaya Shimizu, Hitachinaka, JP;
Toshiyuki Innami, Mito, JP;
Shinichi Fujino, Mito, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Car Engineering Co., Ltd., Hitachinaka-shi, JP;
Abstract
A vehicle electric drive system and a hybrid engine-motor type vehicle drive system realizing simplification and miniaturization of electric parts and, moreover, reduction in cost while maintaining performances can be provided. A partof wheels is driven by an engine. The wheels are driven by a motor as necessary. The motor, a generator, and an accessory battery are connected to each other via a voltage step-up/step-down device. The voltage step-up/step-down device has a function of stepping up power of the battery and supplying the stepping up power to the motor, and a function of stepped down power of the generator and supplying the stepped down power to the battery and the accessories.