Tyre Pressure Monitoring Data Telegram Structure
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Solution Overview
Problem
Tire pressure monitoring systems face challenges in reliably transmitting and receiving data telegrams due to transmission and reception conditions dependent on the angular position of the wheel, leading to incomplete or missed data packets, which can result in the central evaluation unit lacking current pressure information for vehicle tires.
Innovation Solution
The method prioritizes sending pressure information immediately after the preamble in data telegrams, followed by temperature information, and then the characteristic identifier, allowing for more reliable assignment of incomplete data packets by utilizing initial sections of the identifier and existing tire pressure or temperature data, and using additional vehicle components for validation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data telegrams are sent multiple times as packets at short intervals, then transmission reliability is improved, but energy consumption increases
Solution Approach 1:
The patent applies preliminary action by placing the most critical data (pressure information) at the beginning of the data telegram, before the characteristic identifier. This ensures that even if transmission is interrupted, the pressure information is already transmitted and can be used immediately, reducing the need for multiple retransmissions and thus lowering energy consumption while maintaining reliability
Solution Approach 2:
The patent segments the data telegram into priority-based sections: pressure information is transmitted first as the most critical segment, followed by temperature information, and finally the characteristic identifier. This segmentation allows the receiver to process critical pressure data even from incomplete transmissions, improving reliability without requiring full packet retransmissions
2Measurement precision
If the characteristic identifier is transmitted first, then complete identification is ensured, but pressure information delivery is delayed
Solution Approach 1:
The patent inverts the conventional data telegram structure by transmitting pressure information before the characteristic identifier. This inversion prioritizes the most time-critical data (pressure) over identification data, ensuring pressure information is delivered as quickly as possible even if the identifier transmission is interrupted
3Reliability
If more repetitions of data telegrams are used, then data completeness is improved, but transmission time increases
Solution Approach 1:
By placing pressure information at the beginning of the telegram, the patent ensures critical data is transmitted in the first attempt more reliably, reducing the frequency needed for repetitions and thus decreasing total transmission time while maintaining data completeness
Solution Approach 2:
The patent enables the receiver to process partial data (pressure information) from incomplete transmissions, so full repetitions are not always necessary. This partial action approach reduces the number of required repetitions while still achieving sufficient data completeness
Data Source
Figure 1~2
AI summary
The invention relates to a method for operating a tyre pressure monitoring system, which has tyre pressure monitoring units mounted in or on the tyres of a vehicle and a central evaluation unit, wherein tyre data from the tyre pressure monitoring units are sent in the form of data telegrams containing a preamble (OxFF, 0xF2), a piece of pressure information (Prel), a piece of temperature information (T) and a characteristic identifier (ID1, ID2, ID3, ID4), and the pieces of pressure and temperature information of the data telegrams are assigned by the central evaluation unit to a wheel position on the vehicle. According to the invention, in the data telegrams the piece of pressure information (Prel) is sent before the characteristic identifier (ID1, ID2, ID3, ID4), and the central evaluation unit evaluates incompletely received data telegrams and, based on an incomplete characteristic identifier (ID1) or other data available to the central evaluation unit, assigns them to a wheel position.