Wheel Emitter Position Correction via Reference Field Calibration
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Solution Overview
Problem
Current tire monitoring systems face challenges in reliably differentiating between front and rear wheel assemblies due to the need for a high margin in signal strength levels, which is difficult to maintain across various vehicle platforms and leads to architectural constraints.
Innovation Solution
A correction process that analyzes and adjusts the received field levels from emitters mounted on wheels, using a reference level stored during a preliminary phase to correct for deviations, thereby reducing the required margin for differentiation between front and rear wheel assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high margin (10 dB) is set between field levels to account for sensor power tolerance and front/rear wheel differentiation, then reliable position differentiation is achieved, but vehicle platform adaptability deteriorates and architectural constraints increase
Solution Approach 1:
The system performs preliminary measurement of field levels from all wheel emitters during a calibration phase (e.g., during vehicle assembly or first use). These measured values are stored as reference data. During normal operation, the stored reference values are used to determine wheel positions without requiring a large real-time margin, thereby improving adaptability while maintaining reliability.
Solution Approach 2:
The system changes the parameter used for position determination from relying on a fixed large margin between field levels to using measured and stored reference field level values. This parameter change allows the system to adapt to different vehicle platforms and sensor variations without requiring a universal 10 dB margin, thus resolving the contradiction between reliability and adaptability.
2Reliability
If a high margin is set to eliminate reduction in level difference during wheel changes, then position differentiation is maintained, but device complexity and architectural constraints increase
Solution Approach 1:
The system creates a copy of the actual field level measurements during calibration and stores them as reference values. During operation, these copied reference values are used for comparison rather than relying on theoretical margin calculations. This eliminates the need for complex architectural constraints while maintaining reliable position differentiation even after wheel changes.
3Measurement precision
If sensor power tolerance is accommodated by increasing margin, then position accuracy is maintained during wheel changes, but the required margin becomes difficult to ensure across all vehicle platforms
Solution Approach 1:
The system performs preliminary measurement of actual sensor power levels during calibration and stores these measured values. This preliminary action captures the actual power tolerance characteristics of the specific sensors installed, allowing accurate position determination without requiring a universally large margin that would be difficult to ensure across different vehicle platforms.
Solution Approach 2:
The system changes from using a fixed margin parameter to using measured reference parameter values that reflect actual sensor characteristics. This allows the system to maintain measurement precision while being adaptable across different vehicle platforms with varying sensor power tolerances.
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 process reduces the necessary margin for differentiating between front and rear wheel assemblies, eliminating constraints related to emission power tolerances and ensuring accurate positioning without significant architectural changes.
Implementation Method 1
The major problem that such monitoring systems are required to resolve resides in the obligation of having to combine with each signal received by the receiver information that provides the position, in particular the longitudinal position, with regard to the front wheel assembly or the rear wheel assembly
Implementation Method 2
this longitudinal positioning of the front wheel assembly/rear wheel assembly is obtained by comparing the field levels received from each emitter by applying the known power attenuation principle of electromagnetic waves that obey a law of reduction that is proportional to the square of the distance between emitter and receiver
Data Source
AI summary
The invention relates to a process of correction for determining, by a central unit that is provided with a receiver and that equips a vehicle, the longitudinal position, either on the front wheel assembly or on the rear wheel assembly, of emitters that are each mounted on a wheel of said vehicle. This process consists of, in a preliminary phase, determining and storing, for each wheel of the vehicle, a reference field level, received by the receiver and having for an origin an emitter that is combined with said wheel and that exhibits a given mean radiated power. Then, during each start-up of the vehicle and according to the process of the invention, the field levels that are received by the receiver are analyzed, and the location of each of said emitters is deduced therefrom; the analyzed field levels are compared to the reference field levels that correspond to the same location; the deviation between the analyzed field levels and the corresponding reference field levels is derived from this comparison, and the value of each analyzed field level is corrected by a value that is equivalent to the computed deviation, such that said analyzed field level is brought to the same level as the corresponding reference field level.