Dual-Magnetic Detector Wheel Speed Sensing for Higher Resolution
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Solution Overview
Problem
Conventional wheel speed sensors in vehicle systems have limited resolution for measuring wheel rotation speed and direction, making it difficult to accurately control vehicles, especially in autonomous systems, and require replacement of magnetic encoders for higher resolution, which is costly and poses safety risks due to environmental incompatibility.
Innovation Solution
A vehicular wheel rotation speed measuring sensor system that uses two magnetic detectors to generate both low and high-resolution rotation data without replacing the existing magnetic encoder, allowing for accurate wheel speed and direction measurement with enhanced resolution, and operates within various environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional magnetic encoder with limited teeth is used, then the device complexity and cost are low, but the measurement precision of wheel rotation speed and direction is insufficient
Solution Approach 1:
The patent divides the measurement function into two independent parts: the existing magnetic encoder structure remains unchanged, while a separate sensor unit with multiple detectors is added to process the magnetic field signals. This segmentation allows high-resolution measurement without modifying the original encoder, resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent introduces a sensor unit as an intermediary component that detects the magnetic field generated by the existing encoder. This intermediary enables high-resolution measurement by processing magnetic field variations without requiring changes to the original encoder structure, thus achieving improved measurement precision while maintaining simple device architecture
2Measurement precision
If an industrial rotary encoder with a large number of teeth is replaced, then the measurement precision is improved, but the reliability and safety in vehicular environments deteriorate
Solution Approach 1:
The patent makes the existing magnetic encoder serve the dual purpose of its original function and as a source of magnetic field for high-resolution detection. By utilizing the encoder's own magnetic field without requiring replacement, the system achieves high measurement precision while maintaining the reliability and environmental compatibility of the original vehicular-grade encoder
Solution Approach 2:
Instead of replacing the original encoder with an industrial rotary encoder, the patent creates a virtual copy of high-resolution measurement capability through software processing of magnetic field signals. This approach achieves the measurement precision of high-teeth encoders while maintaining the reliability of the original vehicular encoder in harsh environments
3Measurement precision
If an industrial rotary encoder is replaced, then the measurement precision is improved, but the ease of manufacture and mass production capability worsen
Solution Approach 1:
The patent separates the measurement system into the existing encoder and an add-on sensor unit, allowing independent manufacturing and assembly. This segmentation enables high-resolution measurement capability to be integrated without complicating the overall manufacturing process, as the sensor unit can be independently produced and attached to the existing encoder assembly
Solution Approach 2:
The patent creates a universal solution that works with existing magnetic encoders without requiring replacement. The sensor unit can be applied to various encoder types and configurations, enabling high-resolution measurement across different vehicle models and encoder specifications, thus simplifying manufacturing and assembly processes
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 and safe vehicle control with higher resolution wheel speed and direction measurement without replacing the magnetic encoder, simplifying production and reducing costs by providing both low and high-resolution signals simultaneously.
Implementation Method 1
a first magnetic detector configured to detect a magnetic field induced from the magnetic encoder and output a strength value of the magnetic field as a first electrical signal
Data Source
AI summary
A sensor for measuring a rotation speed of a magnetic encoder includes a first magnetic detector detecting a magnetic field induced from the magnetic encoder and outputting a strength value of the magnetic field as a first electrical signal, a second magnetic detector detecting the magnetic field induced from the magnetic encoder and outputting a strength value of the magnetic field as a second electrical signal, a first output signal generator for generating and outputting first rotation data including information indicating a rotation speed of a wheel based on the first electrical signal, and a second output signal generator configured to generate second rotation data including information indicating a rotation speed of the wheel based on the second electrical signal. The information indicating the rotation speed in the second rotation data may have a higher resolution than the information indicating the rotation speed in the first rotation data.