Radio Reflection Sensing for Rotary Speed and Position Detection
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Solution Overview
Problem
Magnetic field sensors used in automotive and industrial applications are costly and require additional components like magnetic pole wheels or ferromagnetic tooth wheels, leading to increased costs and complexity.
Innovation Solution
The use of radio wave-based sensors to determine the position and speed of movable objects, which eliminates the need for magnetic components by employing transceiver circuitry and evaluation circuitry to process radio signals reflected from movable parts, allowing for accurate speed and angle sensing with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic field sensors are used for speed and position sensing, then accurate measurement can be achieved, but additional components (magnetic pole wheels, ferromagnetic tooth wheels, back-bias magnets) are required which increase system cost and complexity
Solution Approach 1:
The patent extracts and eliminates the magnetic components (magnetic pole wheels, ferromagnetic tooth wheels, back-bias magnets) from the sensor system. Instead of using magnetic field interaction, the invention uses a radio frequency transceiver to directly sense the position and speed of the movable part through radio wave reflection, removing the intermediate magnetic components that added complexity
Solution Approach 2:
The patent replaces the magnetic sensing mechanism with a radio frequency electromagnetic sensing mechanism. The transceiver circuitry uses radio waves to detect the position and speed of the movable part, substituting the mechanical/magnetic component interaction with wireless electromagnetic wave reflection and detection
2Measurement precision
If magnetic field sensors are used for speed and position sensing, then accurate measurement can be achieved, but additional components (magnetic pole wheels, ferromagnetic tooth wheels, back-bias magnets) increase manufacturing cost
Solution Approach 1:
The patent removes the costly magnetic components (magnetic pole wheels, ferromagnetic tooth wheels, back-bias magnets) from the system. The transceiver circuitry directly senses the movable part without requiring these additional manufactured components, thereby reducing material costs and assembly complexity
Solution Approach 2:
The transceiver circuitry serves multiple functions: it transmits radio signals, receives reflected signals, and processes the signals to determine both position and speed information. This multi-functionality eliminates the need for separate magnetic sensors and magnetic components, reducing overall system cost
3Device complexity
If conventional magnetic sensors are replaced with radio wave-based sensors, then system cost and complexity are reduced, but power consumption must be managed
Solution Approach 1:
The transceiver circuitry operates in periodic cycles, transmitting radio signals at intervals rather than continuously. This periodic operation allows the system to maintain sensing capability while significantly reducing average power consumption compared to continuous transmission, making the solution energy-efficient for battery-powered or low-power applications
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
This approach reduces system costs and simplifies design by replacing conventional magnetic sensors with low-power radar sensors, enabling accurate speed and angle sensing in close proximity to the movable parts without the need for ferromagnetic materials or back-bias magnets.
Implementation Method 1
The transceiver circuitry is configured to transmit a radio signal towards the movable part and to receive a reflection of the radio signal from the movable part
Data Source
AI summary
A system includes a movable part that is rotatably movable, the movable part comprising a first portion and a second portion; transceiver circuitry configured to transmit a radio signal towards the movable part and to receive a receive radio signal from the movable part; and evaluation circuitry configured to determine a rotational position of the movable part based on the receive radio signal. The first portion of the movable part has a first electromagnetic reflectivity for the radio signal and the second portion of the movable part has a second electromagnetic reflectivity for the radio signal. The first electromagnetic reflectivity differs from the second electromagnetic reflectivity.