Wireless Wheel Speed Sensor Using Centripetal Acceleration
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Solution Overview
Problem
Existing vehicle speed measurement systems require physical connections, which can be prone to assembly and durability issues and become inaccurate when wheel diameters change, leading to incorrect speed readings.
Innovation Solution
A system that wirelessly communicates vehicle speed data by using sensors on the wheels to measure centripetal acceleration and transmit signals to an electronic control unit for computation and display, allowing for recalibration based on tire and rim radii.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a physical connection is used to communicate rotational speed from the transmission to the speedometer, then the speedometer can display vehicle speed, but the system becomes subject to assembly and durability concerns that may result in incorrect speed readings
Solution Approach 1:
The patent replaces the mechanical cable connection system with a wireless communication system. A sensor mounted on the wheel hub detects wheel rotation and transmits speed data wirelessly to the speedometer, eliminating the mechanical cable that connects the transmission to the speedometer. This substitution resolves the technical contradiction by improving reliability through elimination of mechanical connection failures while maintaining the speed display function.
2Measurement precision
If the speedometer is calibrated to correspond to the factory wheel diameter, then accurate speed readings are obtained with original wheels, but the speedometer becomes inaccurate when wheel rims and tires are replaced with different overall diameter
Solution Approach 1:
The patent enables dynamic parameter adjustment by allowing the speedometer to be recalibrated with new wheel diameter values when wheels are replaced. Since the sensor is mounted on the wheel hub rather than receiving calibrated signals from the transmission, the system can adapt to different wheel sizes by updating the calibration parameter (wheel diameter) without requiring physical reconnection or recalibration of mechanical components. This resolves the contradiction by maintaining measurement precision across different wheel configurations.
3Duration of action of stationary object
If a cable connection is used between the transmission and speedometer, then rotational speed can be transmitted, but the physical connection may fail or become disconnected over time
Solution Approach 1:
The patent eliminates the mechanical cable connection by implementing a wireless transmission system. The sensor on the wheel hub communicates speed data wirelessly to the speedometer, removing the cable that is subject to physical wear, disconnection, and assembly issues. This resolves the contradiction by ensuring long-term durability without compromising signal transmission reliability.
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 solution provides accurate and reliable vehicle speed measurement without physical connections, enabling recalibration for different wheel sizes and improving durability and accuracy.
Implementation Method 1
a sensor mounted on the wheel for sensing centripetal acceleration of the wheel and generating a signal indicative of the sensed centripetal acceleration
Data Source
AI summary
The present invention is a system for determining vehicle speed. The system has a sensor mounted on a wheel rotatably mounted on the vehicle for sensing centripetal acceleration of said wheel. The sensor generates a signal indicative of the sensed centripetal acceleration, and is arranged to wirelessly transmit the signal. The system additionally has an electronic control unit mounted on the vehicle. The electronic control unit is arranged to receive the signal and determine the speed of the vehicle based on the sensed centripetal acceleration.