Turn angle detection system and power steering device that uses this

The rotary angle detection device addresses power supply failure detection in power steering systems by maintaining operation through direct battery connection, enabling accurate rotation angle and number of rotations calculation during failures, thus ensuring fail-safe steering operations.

DE102015102158B4Active Publication Date: 2026-06-03DENSO CORP
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
DENSO CORP
Filing Date
2015-02-16
Publication Date
2026-06-03

AI Technical Summary

Technical Problem

Existing rotary angle detection devices fail to detect power supply failures accurately, leading to potential errors in power steering systems due to voltage reductions from irregularities in wiring harnesses, battery voltage drops, or battery replacements.

Method used

A rotary angle detection device connected directly to the battery via a cable harness, incorporating a sensor, processor, memory, and communication section, which maintains operation and detects power supply failures by storing failure information in volatile memory, allowing the controller to initiate fail-safe operations.

Benefits of technology

Enables continuous detection and calculation of rotation angles and number of rotations during power supply failures, reducing electrical consumption and ensuring accurate steering angle calculations without the need for relearning the neutral position upon power restoration.

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Abstract

Featuring a rotation angle detection system: a rotary angle detection device (20) which is directly supplied with electrical power by a battery (65); and a control unit (50) which is provided separately from the rotary angle detection device (20) and is connected to the battery (65) by an ignition switch (60) which switches the power supply to the control unit (50) from the battery (65), wherein the rotary angle detection device (20) comprises the following: a sensor (21) which detects a detection value which is variable according to a rotation of a detection object (80); a calculator (23) which calculates rotation information of the detection object (80) based on the detection value which is detected by the sensor (21); a memory (241) which stores power supply failure information indicating the occurrence of a power supply failure in which electrical power to the rotary angle detection device (20) is not supplied by the battery (65); and a communication section (25) which outputs the rotation information to the control unit (50). the memory (241) is a volatile memory which, when the power supply failure occurs, sets the power supply failure information to an initial value indicating the occurrence of the power supply failure, the rotation angle detection device (20) is configured: In the event of a power supply failure, the power supply failure information in memory (241) is set to the initial value indicating the occurrence of a power supply failure, and after setting the power supply failure information in the memory (241), which indicates the occurrence of a power supply failure, output the power supply failure information to the controller (50) and receive a notification signal from the controller (50), and After receiving the notification signal from the controller (50), the power supply failure information is set to a normal value indicating that no power supply failure has occurred, and the controller (50) is configured: to receive the power supply failure information indicating the occurrence of a power supply failure from the rotary angle detection device (20), After receiving the power supply failure information, record a neutral position of the recording object (80), and After detecting the neutral position of the detection object (80), the notification signal is to be sent to the rotation angle detection device (20).
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