Shaft Angle Sensor System Reducing Mutual Influence
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Solution Overview
Problem
Existing sensor systems for determining the absolute rotation angle of a shaft, particularly in vehicles, are costly and prone to inaccuracies due to mutual influence between sensor devices, especially when a third sensor device with a full 360° detection range is used.
Innovation Solution
A sensor system with a third sensor device having a detection range of less than 360°, allowing for higher accuracy within a defined angular range and reducing mutual influence between sensor devices, thereby improving cost-effectiveness and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a third sensor device with a full 360° detection range is used to determine absolute rotation angle, then measurement precision is improved, but mutual influence between sensor devices increases causing errors
Solution Approach 1:
The detection range of the third sensor device is segmented into multiple detection ranges, each with a different detection direction. This segmentation allows the sensor device to cover a full 360° rotation angle range while minimizing mutual influence between sensor devices by directing detection beams in different directions for different angular segments.
2Measurement precision
If a third sensor device with a full 360° detection range is used, then measurement precision is improved, but production costs increase
Solution Approach 1:
The third sensor device is designed to perform multiple functions: it provides high-precision relative rotation angle detection within each detection range while also contributing to absolute rotation angle determination across the full 360° range. This multi-functionality reduces the need for additional dedicated sensors, thereby lowering production costs while maintaining measurement precision.
3Ease of manufacture
If a third sensor device with a limited detection range of less than 360° is used, then production costs are reduced and mutual influence is minimized, but measurement precision deteriorates
Solution Approach 1:
The sensor system dynamically switches between different detection ranges and directions of the third sensor device depending on the current rotation angle. This dynamic operation allows the system to maintain high measurement precision across the full rotation range by always using the optimal detection range for the current angular position, while keeping the device structure simpler and more cost-effective.
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 sensor system achieves high accuracy within the detection range of the third sensor device, reducing production costs and minimizing errors from mutual sensor influence, while maintaining functionality without significant disadvantages in most applications.
Implementation Method 1
The third sensor device has a magnetic sensor arranged between the two auxiliary rotors on a common printed circuit board in a stationary manner with respect to the main rotor as well as a magnetic ring arranged on the main rotor and formed over the entire circumference, which is composed of magnetic north and south poles arranged alternately in the circumferential direction
Data Source
AI summary
The invention relates to a sensor system (1), and a method for determining an absolute rotation angle (δ) of a shaft (10) with a rotation angle range of more than one revolution and to a vehicle fitted with a sensor system (1), wherein the sensor system (1) has a main rotor (2) that can be connected rotationally synchronously to the shaft (10), a first auxiliary rotor (3) which is mechanically coupled to the main rotor (2), a second auxiliary rotor (4) mechanically coupled to the main rotor (2), a first sensor device (SE1) which is assigned to the first auxiliary rotor (3) for generating a first sensor signal dependent on a rotation angle of the first auxiliary rotor (3), a second sensor device (SE2) which is assigned to the second auxiliary rotor (4) for generating a second sensor signal dependent on a rotation angle of the second auxiliary rotor (4), a third sensor device (SE3) which is assigned to the main rotor (2) and which is used for generating a third sensor signal dependent on a relative rotation angle (γ) of the main rotor (2) and an evaluation device for determining the absolute rotation angle (δ) of the main rotor (2) from the sensor signals of the sensor devices (SE1, SE2, SE3). The detection range (α) of the third sensor device is less than 360°.