Vehicle Wheel Speed Reader Using Field Strength Fluctuation
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Solution Overview
Problem
Existing systems for monitoring vehicle tire dynamics using contactless readable data carriers are limited by the assumption of constant tire diameters, leading to measurement inaccuracies when tire diameters vary, such as between summer and winter tires.
Innovation Solution
A system comprising a contactless readable data carrier with a tire pressure sensor and a reader that calculates wheel revolutions and peripheral speed using field strength fluctuations, with a table in non-volatile memory to store tire pressure to wheel periphery reference values, allowing adaptation to different tire diameters and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the system assumes constant tire diameters for monitoring vehicle tire dynamics, then the system design is simplified, but measurement accuracy deteriorates when tire diameters vary (e.g., between summer and winter tires)
Solution Approach 1:
The system dynamically adapts to varying tire diameters by detecting wheel revolutions through field strength fluctuations and using these detections to calculate actual wheel periphery. The system transitions from assuming constant diameter to actively measuring and adapting to the actual varying diameter, resolving the contradiction between simplified design and accurate measurement.
Solution Approach 2:
The system changes the parameter approach by not fixing the tire diameter as a constant but allowing it to vary based on detected wheel revolutions. The wheel periphery is recalculated based on actual operational conditions, enabling accurate measurements across different tire types while maintaining system simplicity.
2Device complexity
If the system is designed for permanently integrated readers in vehicles with constant tire diameters, then the system structure is simplified, but adaptability to different vehicles and tire types deteriorates
Solution Approach 1:
The reader device achieves universality by detecting wheel revolutions through electromagnetic field strength fluctuations without requiring vehicle-specific calibration or constant tire diameter assumptions. The same reader structure can be applied across different vehicles and tire types, as it adapts to the actual wheel periphery through revolution detection and calculation.
Solution Approach 2:
The system becomes adaptable through dynamic calculation of wheel periphery based on detected revolutions rather than relying on pre-programmed constant values. This dynamic approach allows the same system structure to work with varying tire diameters and different vehicle types.
3Measurement precision
If wheel periphery reference values are manually configured for each vehicle, then measurement accuracy improves, but user intervention and setup time increase
Solution Approach 1:
The system performs self-service by automatically determining wheel periphery through detection of wheel revolutions via field strength fluctuations. No manual configuration or user intervention is required, as the system self-calibrates by measuring the actual wheel characteristics during operation, achieving both accuracy and ease of operation.
Solution Approach 2:
The system performs preliminary detection of wheel revolutions and calculates wheel periphery automatically before actual speed and distance measurements are taken. This preliminary self-calibration eliminates the need for manual setup while ensuring accurate subsequent measurements.
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 calculation of wheel peripheral speed and distance covered, accommodating varying tire diameters and pressures, and allows for use on multiple vehicles with minimal user intervention, including automatic updates of wheel periphery reference values.
Implementation Method 1
a reader which can be arranged on the vehicle for receiving electromagnetic signals emitted by the data carrier, the reader being designed to determine the wheel revolutions from the field strength fluctuations of the electromagnetic signals received
Data Source
AI summary
A system comprises at least one contactless readable data carrier (1) which can be attached to a wheel (100) of a vehicle and a reader (10) which can be arranged on the vehicle to receive electromagnetic signals (ES) emitted by the data carrier (1). The reader (10) is designed to determine the revolutions of the wheel (100) from the field strength fluctuation of the received electromagnetic signals (ES), the reader (10) having calculation means (19) designed to calculate from the revolutions and a wheel periphery reference value (RU) determined by the reader and allocated to the wheel (100), such as circumference, diameter or radius, a distance covered by a point on the wheel periphery and/or values derivable therefrom such as the peripheral speed (UV) of the wheel (100).