TPMS Wheel Position Assignment via Reliability Weighted Data
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Tire pressure monitoring systems face challenges in transmitting reliable data under adverse conditions, such as noisy measurement signals from acceleration sensors, leading to incomplete or unreliable information being sent to central evaluation units, especially regarding wheel direction and rotation.
Innovation Solution
The tire pressure monitoring unit includes information about the reliability of pressure and acceleration data in data telegrams, using flags or probability values to indicate uncertainty, and synchronizes with ABS sensors to ensure accurate wheel position assignment, weighting data telegrams based on reliability for improved evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple measurements are taken at very short intervals to reduce data volume, then transmission efficiency is improved, but measurement reliability deteriorates under noisy conditions
Solution Approach 1:
The patent introduces an intermediary reliability indicator that mediates between the conflicting requirements of transmission efficiency and measurement reliability. This indicator is calculated from multiple measurements taken at short intervals and transmitted alongside the actual measurement data, allowing the central evaluation unit to assess the quality of measurements without requiring extensive transmission of raw measurement sequences.
2Reliability
If data fields remain empty when measurements are unreliable, then false information is avoided, but information completeness deteriorates
Solution Approach 1:
The patent segments the data transmission into multiple components: the actual measurement data and a separate reliability indicator. This segmentation allows the system to transmit complete information (both measurement and quality assessment) without transmitting false or unreliable data, thereby maintaining both data accuracy and information completeness.
3Ease of operation
If acceleration sensor measurements are used to determine wheel direction, then rotational information is obtained, but measurement uncertainty increases under noisy conditions
Solution Approach 1:
The patent applies preliminary action by taking multiple acceleration sensor measurements at short intervals before final evaluation. This allows the system to pre-assess the quality of rotational information and calculate reliability indicators, enabling the central evaluation unit to make informed decisions about the accuracy of wheel direction determination under noisy conditions.
Data Source
AI summary
A tire pressure monitoring unit is mounted on a vehicle wheel having a pressure and acceleration sensor. A method for assigning wheel positions includes pressure and acceleration data determined from the sensors. The pressure data and at least one piece of information derived from the acceleration data are transmitted wirelessly in a data telegram together with a characteristic identifier. Information concerning the reliability of the information derived from the acceleration data is acquired in the tire pressure monitoring unit on the basis of the measurements and is transmitted with the data telegram. A central evaluation unit considers a plurality of data telegrams and, taking account of data from the ABS sensors, assigns the individual tire pressure monitoring units to wheel positions. Data telegrams in which the reliability is higher receive a greater weighting, and data telegrams in which the reliability is smaller receive a smaller weighting.