Axial Shaft Position Sensing With Coil Correction for Steer-By-Wire
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Solution Overview
Problem
Existing position detection devices for steer-by-wire mechanisms in automobiles lack the accuracy required for high-precision steering control necessary for automated driving, as they do not effectively measure the axial displacement of the shaft determining the steering angle.
Innovation Solution
A position detection device comprising a detection object, a substrate with an excitation coil and detection coils, and a sensor for correcting the shaft's position using these coils, which generates an AC magnetic field and varies induced voltage based on the shaft's position, enabling high-accuracy detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional position detection device is used for steer-by-wire mechanisms, then the device structure is simple, but the measurement precision of shaft position is insufficient for automated driving requirements
Solution Approach 1:
The patent replaces mechanical contact-based position detection with a non-contact magnetic field detection system. The excitation coil generates a magnetic field that interacts with the detection coil to detect shaft position without mechanical contact, thereby improving measurement precision while avoiding mechanical wear and contact errors
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (induced voltage magnitude and phase) in response to shaft position changes. By detecting these parameter variations through the detection coil, the system achieves high-precision position measurement without mechanical contact
Solution Approach 3:
The patent introduces a magnetic field as an intermediary between the excitation source and the detection system. The excitation coil generates the magnetic field, which then interacts with the detection coil to provide position information, enabling non-contact measurement with high precision
2Manufacturing precision
If high-accuracy position detection is implemented, then steering control precision improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The substrate integrates multiple functions including mechanical support, electrical connection, and magnetic field interaction. By combining these functions into a single component, the patent reduces the number of separate parts needed, simplifying manufacturing while maintaining high detection precision
Solution Approach 2:
The patent merges the excitation coil and detection coil onto a single substrate, creating an integrated detection system. This consolidation reduces assembly complexity and manufacturing steps while achieving the required measurement precision for steering control
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
The device achieves precise detection of the shaft's axial position, enhancing the accuracy of steering control for automated driving by correcting for eccentricity and deflection, thus improving the robustness and precision of the steer-by-wire system.
Implementation Method 1
an excitation coil that is mounted on the substrate and generates an AC magnetic field
Implementation Method 2
a detection coil that is mounted on the substrate and arranged along the axial direction of the shaft and configured so that a magnitude of a voltage induced varies with a position of the detection object
Data Source
AI summary
A position detection device for detecting a position of a shaft moving forward and backward in an axial direction is provided with a detection object mounted on the shaft, a substrate disposed to face the detection object, an excitation coil that is mounted on the substrate and generates an AC magnetic field, a detection coil that is mounted on the substrate and arranged along the axial direction of the shaft and configured so that a magnitude of a voltage induced varies with a position of the detection object, and a sensor for detecting a physical quantity used to correct the position of the shaft by using a sensor coil configured by the excitation coil, the detection coil, or an other coil provided on the substrate.