Control apparatus for electric power steering system

US8175771B2 · kind B2 · utility

Assignees

• NATIONAL UNIVERSITY CORPORATION NAGOYA INSTITUTE OF TECHNOLOGY · US
• DENSO CORPORATION · JP

Inventors

• Hiroyuki Ukai · Nagaokakyo, JP
• Yoshifumi Morita · Nagoya, JP
• Makoto Iwasaki · Tokyo, JP
• Nobuyuki Matsui · Ibaraki, JP
• Norio Tsuchida · Kariya, JP
• Yuya Yamamoto · Osaka, JP
• Jiro Hayashi · Ama, JP
• Akihiko Sawada · Toyohashi, JP
• Nobuhiko Makino · Anjo, JP

Key dates

• Filing date: Jun 10, 2008
• Grant date: May 8, 2012
• Expiry date: Oct 31, 2030

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B62D5/0481
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

There is provided a control apparatus that controls a motor of an electric power steering system to assist a steering effort of an operator. The control apparatus includes a sensor, a parameter computer, a difference computer, a target torque computer, and a motor driver. The parameter computer computes a current value of one of physical parameters of one of constituents of the electric power steering system based on a steering parameter determined by the sensor referring to an equation of motion. The difference computer computes a difference between the current value of the one of the physical parameters computed by the parameter computer and a predetermined value of the one of the physical parameters. The target torque computer computes a target torque of the motor which compensates for the difference between the current value and the predetermined value of the one of the physical parameters.