Electric power steering apparatus

Patent metadata

Field	Value
Publication number	US-8977433-B2
Application number	US-201113202917-A
Country	US
Kind code	B2
Filing date	Jul 26, 2011
Priority date	Nov 18, 2010
Publication date	Mar 10, 2015
Grant date	Mar 10, 2015

Abstract

An electric power steering apparatus includes a first torque calculating unit for calculating a first torque command based on a steering torque detected by the steering torque detecting unit, a second torque command calculating unit for calculating a second torque command based on the wheel rotation speed, an emergency switching unit for outputting the second torque command instead of the first torque command when error of the rotation torque is detected, a wheel rotation speed error detecting unit for detecting an error of the wheel rotation speed based at least on the wheel rotation speed, the steering torque in a normal state and the motor rotation information, and an emergency command limiting unit for liming the second torque command when normal and the motor rotation information, and where error of the wheel rotation speed is detected, when the second torque command is selected by the emergency switching unit.

First claim

The invention claimed is:

1. An electric power steering apparatus comprising:
a steering torque detecting unit configured to detect a steering torque input to a steering mechanism;
a first torque command calculating unit configured to calculate a first torque command based on the steering torque detected by the steering torque detecting unit;
an electric motor configured to generate a steering assist torque to be supplied to the steering mechanism;
a torque detecting unit er…

Assignees

• Kojima Atsushi
• Nsk Ltd

Inventors

• Kojima Atsushi

Classifications

• B62D5/0463 Primary

  Operations & Transport · mapped topic

• B62D5/049

  Operations & Transport · mapped topic

• B62D5/0484

  Operations & Transport · mapped topic

• B62D6/00

  Operations & Transport · mapped topic