Multi-turn Detection Unit for Steering Angle Calculation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rotation angle detection devices in vehicles require continuous power supply to function, leading to potential battery drain even when the ignition is turned off, as they need to continuously detect rotation angles to calculate steering angles accurately.
Innovation Solution
The implementation of a multi-turn detection unit that can detect rotation positions without electric power, using magnetic storage methods to hold the rotation position, allowing for continued detection even when power is interrupted, and a control unit that calculates absolute angles using both motor rotation angles and count values to ensure accurate steering angle calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous detection is performed to calculate steering angles accurately, then measurement precision is improved, but use of energy deteriorates
Solution Approach 1:
The detection device is divided into two independent parts: a multi-turn detection unit that operates without power supply and a rotation angle detection unit that requires power supply. This segmentation allows the system to maintain basic detection functionality during ignition-off while consuming power only when needed for enhanced precision measurements.
Solution Approach 2:
The multi-turn detection unit performs preliminary detection of rotation positions before power is supplied to the rotation angle detection unit. By pre-detecting and storing rotation position information in non-volatile memory, the system prepares data in advance that can be used immediately when power is restored, eliminating the need for continuous power consumption.
2Reliability
If power supply is continued during ignition-off to maintain detection, then reliability is improved, but loss of energy deteriorates
Solution Approach 1:
The multi-turn detection unit is designed to be self-powered through the motor's residual magnetic field, eliminating the need for external power supply during ignition-off. The system serves itself by utilizing the motor's own magnetic properties to maintain detection functionality without draining the battery.
Solution Approach 2:
The patent replaces the electrical power supply mechanism with a magnetic field-based detection mechanism during ignition-off. By using the motor's residual magnetic field to drive the multi-turn detection unit, the system substitutes electrical energy consumption with magnetic field utilization, maintaining reliability without energy loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate detection and calculation of steering angles without continuous power supply, preventing battery drain and ensuring reliable operation even during ignition-off periods.
Implementation Method 1
a multi-turn detection unit that can detect rotation positions without electric power, using magnetic storage methods to hold the rotation position
Data Source
AI summary
A control unit having a detection device that includes: a multi-turn detection unit capable of continuing detection of a rotation position of multiple rotations of a steering shaft driven by a motor without power supply from outside; a position detector detecting the rotation position in one rotation of the rotor; a count calculator calculating multiple rotation position information related to the rotation position of multiple rotations based on a detection value of the multi-turn detection unit; and an angle calculator calculating a motor rotation angle related to the rotation position in one rotation based on a detection value of the position detector. The multi-turn detection unit is disposed at a position different from the motor, thereby detection of the rotation position of multiple rotations is continuable even when a supply of electric power from outside is interrupted.