Rotation angle detection device, electric power steering device, and control method for electric power steering device
By intermittently powering the sensor and combining it with a torque sensor and motor control, the problem of power waste during ignition switch off is solved, thus improving the energy efficiency of the electric power steering system.
CN114270133BActive Publication Date: 2026-06-26NSK LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NSK LTD
- Filing Date
- 2021-04-07
- Publication Date
- 2026-06-26
AI Technical Summary
Technical Problem
In the prior art, the sensor's current consumption increases when the ignition switch is off, resulting in wasted power.
Method used
The sensor is driven by intermittent power supply. By detecting changes in sine and cosine signals, the drive interval is adjusted to reduce power consumption during power switch disconnection. Combined with torque sensor and motor control, the steering angle is calculated to control the steering assist force.
Benefits of technology
This effectively reduces power consumption during periods when the power switch is off, thus improving the energy efficiency of the electric power steering system.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN114270133B_ABST
Abstract
The power supply control section (56) sets the driving interval in which the power supply is intermittently supplied to the sensor (32) to drive the sensor (32) to the first time interval (x seconds) in a case where the change in any of the sine signal and the cosine signal is not detected, to a second time interval ((x-2.2) seconds) shorter than the first time interval in a case where the change in only either of the sine signal and the cosine signal is detected, and to a third time interval ((x-4.4) seconds) shorter than the second time interval in a case where the change in the other signal is detected after the change in either of the sine signal and the cosine signal is detected.
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