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Electric power steering system

An electric power steering and steering wheel technology, which is applied to power steering mechanisms, automatic steering control components, steering mechanisms, etc., and can solve problems such as maintaining the steering state.

Active Publication Date: 2012-04-04
JTEKT CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the method for judging the steering state of Japanese Patent Laid-Open No. 2002-120741, although the steering state of the steering wheel is in the neutral state, there is a problem that the steering state may be judged to be the maintained steering state because the electric current of the motor exceeds a predetermined value.

Method used

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Examples

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other Embodiment approach

[0163] In addition, embodiment of this invention is not limited to what was shown in the said embodiment, For example, it can change and implement as follows. In addition, each of the following modified examples can be applied not only to the above-mentioned embodiment, but also can be implemented in combination with different modified examples.

[0164] a. In the "steering state determination process" of the above-mentioned embodiment, when the steering speed ωs is smaller than the determination value ωa and the motor current Im is greater than the reference value Ix, the steering wheel 2 is confirmed by determining whether the steering state of the steering wheel 2 is a neutral state. Whether the steering state is "neutral state". The determination process for the above confirmation can be changed as follows. That is, it can be confirmed whether the steering state of the steering wheel 2 is the “neutral state” based on whether the state of maintaining the motor current Im w...

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Abstract

An electric power steering system determines a steering state of a steering wheel on the basis of a current (Im) of a motor applying assist force to a steering system and a steering speed (es) of the steering wheel. A state where the steering wheel is retained at a position other than a neutral position is a retained state, and a state where the steering wheel is placed at the neutral position is a neutral state. When the steering speed (es) is lower than a determination value (ea) and the motor current (Im) is larger than a reference value (Ix), it is determined whether the steering state is the neutral state. When the steering speed (es) is lower than the determination value (ea), the motor current (Im) is larger than the reference value (Ix), and the steering state is determined to be the neutral state at immediately preceding determination, the steering state is determined to be the neutral state.

Description

[0001] The entire disclosure of Patent Application No. 2010-199041 filed in Japan on September 6, 2010 including specification, drawings and abstract is incorporated herein by reference. technical field [0002] The present invention relates to an electric power steering apparatus that determines the steering state of a steering wheel based on a detected value of at least one of a current and a voltage of a motor that applies an assist force to a steering system and a steering speed of the steering wheel. Background technique [0003] In the electric power steering device described in Japanese Patent Application Laid-Open No. 2002-120741, the steering state of the steering wheel is determined to be the maintained steering state based on the fact that the steering speed of the steering wheel is lower than a predetermined value. In addition, in conjunction with the determination that the steering state is a maintained steering state, when it is determined that the current of th...

Claims

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Application Information

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IPC IPC(8): B62D6/00B62D113/00B62D101/00
CPCB62D5/0481B62D5/0466B62D5/0487
Inventor 前田真悟狩集裕二
Owner JTEKT CORP
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