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. 24, 1989
Filed:
Mar. 31, 1988
Toshimi Abukawa, Hitachiota, JP;
Kazuo Tahara, Hitachi, JP;
Katsuji Murumoto, Hitachi, JP;
Toshiyuki Koterazawa, Hitachi, JP;
Mitsuyuki Hombu, Katsuta, JP;
Tadashi Takahashi, Hitachi, JP;
Shuichi Takamatsu, Hitachi, JP;
Hisatugu Ishikura, Katsuta, JP;
Hiroshisa Yamamura, Hitachiota, JP;
Toru Tatsuzaki, Funabashi, JP;
Tsutomu Ohmae, Hitachi, JP;
Toshiaki Okuyama, Ibaraki, JP;
Seizi Yamashita, Katsuta, JP;
Shigeki Saito, Katsuta, JP;
Masato Sakai, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Automotive Engineering Co., Ltd., Katsuda, JP;
Abstract
An electric power steering control system includes an electric motor for producing an assisting torque for the vehicle steering system through a reduction gear, a steering torque sensor fitted on the steering shaft, a controller for controlling the input to the motor in accordance with the torque sensor output, a battery for supplying power to the controller, and a voltage step-up circuit connected to the battery for driving the motor at a voltage higher than the battery voltage. The controller drives the motor at a high voltage.