Hitachi, Ltd.

Hitachi Automotive Engineering Co., Ltd.

Hiroshisa Yamamura

Hiroshi Kimura

Toshiaki Okuyama

Kazuo Tahara

Toshimi Abukawa

Mitsuyuki Hombu

Hisatugu Ishikura

Toshiyuki Koterazawa

Toru Tatsuzaki

Shuichi Takamatsu

Katsuji Marumoto

Tsutomu Omae

Tsutomu Ohmae

Seizi Yamashita

Shigeki Saito

Masato Sakai

Katsuji Murumoto

A generator generates two voltage outputs which have different voltage levels. One voltage output from the generator is used for operating a power steering apparatus. Another voltage output from the generator is used for charging a battery which supplies current to other loads.

Motor-driven power steering apparatus

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.

Electric power steering control system

Growing community of inventors

Hitachioota, Japan

Hiroshisa Yamamura