Denso Corporation

Nagoya Institute of Technology

Kazuhiro Ichikawa

Hiroshi Ishikawa

Jirou Hayashi

Makoto Iwasaki

Nobuyuki Matsui

Yoshifumi Morita

Noriyuki Ido

Hiroyuki Ukai

Yutaka Oohashi

Kentaro Torii

A control unit for a rotary electric machine includes a first current command module, a second current command module, a change module, and a return module. The first module performs a first current command on a maximum efficiency characteristic line on a d-q plane thereby to drive the machine at a maximum efficiency. The second module performs a second current command on a switching line set at a retard angle side relative to the maximum efficiency characteristic line. The change module changes a control mode from a rectangular wave voltage phase control mode to an overmodulation current control mode when an operation point of the machine reaches the switching line. The return module returns the current command from the second command to the first command after performance of the second command for a predetermined period.

Electric power source circuit and abnormality diagnosis system

In a steering system having a variable gear transmission system and an electrical power steering system, respective compensation amounts for first and second electric motors are produced by a first mathematical model. The compensation amounts are added to command values (v, v) to generate final command signals (i, i) to the respective electric motors. According to the above structure and operation, a mutual interference between two control systems can be suppressed.

Control device for electrical power steering system

Growing community of inventors

Kariya, Japan

Kazuhiro Ichikawa