Method of preventing over stroke in rear-wheel steering system and linear sensor applied thereto
US-2015367882-A1 · Dec 24, 2015 · US
Electric power steering device
US9065375B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9065375-B2 |
| Application number | US-201113991992-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 17, 2011 |
| Priority date | Mar 17, 2011 |
| Publication date | Jun 23, 2015 |
| Grant date | Jun 23, 2015 |
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Abstract
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A microcomputer calculates an internal resistance value of a motor, and subsequently calculates an internal resistance value of a switching element of a motor drive circuit. When the internal resistance value of the motor is a semi-abnormal value, the microcomputer sets an upper limit current. When the internal resistance value of the motor drive circuit is a semi-abnormal value, the microcomputer sets an upper limit current. The microcomputer sets a smaller one of the upper limit current and the upper limit current as an upper limit current of the motor. In this manner, the progress of degradation of the motor and the motor drive circuit can be suppressed.
First claim
Opening claim text (preview).
The invention claimed is: 1. An electric power steering device, comprising: steering torque detection means for detecting a steering torque input from a steering wheel; a motor provided in a steering mechanism; a motor drive circuit comprising a switching element for controlling energization of the motor; control amount calculation means for calculating a control amount of the motor based on the steering torque detected by the steering torque detection means; switch contro…
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Operations & Transport · mapped topic
- B62D5/0487Primary
Operations & Transport · mapped topic
- H02P29/0088Primary
Electricity · mapped topic
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Frequently asked questions
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- What does patent US9065375B2 cover?
- A microcomputer calculates an internal resistance value of a motor, and subsequently calculates an internal resistance value of a switching element of a motor drive circuit. When the internal resistance value of the motor is a semi-abnormal value, the microcomputer sets an upper limit current. When the internal resistance value of the motor drive circuit is a semi-abnormal value, the microcompu…
- Who is the assignee on this patent?
- Yanai Kohei, Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification B62D5/0487. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Jun 23 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).