Tire Pressure Monitoring Identifier Allocation via Rotation Speed Comparison
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Solution Overview
Problem
Existing methods for allocating tire pressure monitoring system identifiers to ABS-sensor positions on a vehicle are either unreliable or slow, leading to delayed and inaccurate tire pressure control, as they rely on single measurements and are prone to errors, especially when rotation speed differences between wheels are minimal or when the receiving antenna is centrally located.
Innovation Solution
A method that repeatedly compares rotation speed information from wheel electronics with ABS sensors over short time periods, using a frequency matrix to determine the most frequent allocation of identifiers to ABS sensors, ensuring reliable and quick allocation even with centrally located antennas, and automatically updates allocations during vehicle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single measurement methods are used for allocating identifiers to ABS sensors, then the allocation process is simple, but the reliability and accuracy of tire pressure control deteriorates
Solution Approach 1:
The system performs preliminary allocation of identifiers to ABS sensors based on rotation speed comparisons before actual tire pressure monitoring begins. This preliminary action ensures that when monitoring starts, the mapping between wheel electronics and ABS sensors is already established, improving reliability without adding complexity to the ongoing monitoring process
Solution Approach 2:
The system continuously compares rotation speeds from wheel electronics with ABS sensors and uses feedback from these comparisons to confirm and update identifier allocations. This feedback mechanism ensures accurate tire pressure control by maintaining reliable mappings even when wheel positions change or sensors are replaced
2Productivity
If single measurement methods are used for allocating identifiers, then the processing speed is fast, but the accuracy of identifier allocation deteriorates
Solution Approach 1:
The system performs identifier allocation as a preliminary step before normal operation, using stored rotation speed data to establish mappings. This allows accurate comparisons to be made without delaying the actual tire pressure monitoring, maintaining both speed and accuracy
Solution Approach 2:
The system changes the parameter being measured from absolute rotation speed to the difference or relationship between wheel electronics rotation speed and ABS sensor rotation speed. This parameter transformation enables more accurate identifier allocation by focusing on relative differences that are more consistent and reliable
3Device complexity
If centrally located antennas are used for receiving signals, then the vehicle structure is simplified, but the reliability of identifier allocation deteriorates
Solution Approach 1:
The system uses feedback from continuous rotation speed comparisons to verify and update identifier allocations. This feedback mechanism compensates for the reduced signal differentiation caused by centrally located antennas, maintaining reliable allocation by relying on the consistency of rotation speed relationships rather than signal strength variations
Solution Approach 2:
The system uses the vehicle's own motion and the natural differences in rotation speeds between wheels to perform self-identification and allocation. This self-service approach eliminates the need for complex antenna positioning or external calibration equipment, maintaining simplicity while ensuring reliability through the inherent dynamics of vehicle operation
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 method provides a more reliable and faster allocation of wheel electronics to ABS sensors, enabling timely and accurate tire pressure monitoring by using multiple measurements to identify predominant allocations, which are stored and updated continuously, ensuring accurate display of anomalies and adaptability to wheel changes without manual intervention.
Implementation Method 1
the gravitational acceleration is superimposed to the radial acceleration and the tangential acceleration of a wheel. The influence of gravitational acceleration changes its sign twice with every rotation of the wheel.
Implementation Method 2
a motion sensor, in particular an acceleration sensor, which provides information on the rotation speed of the wheel
Implementation Method 3
a transmitter, which transmits signals, which not only contain the individual identifier, but also information on the rotation speed of the respective wheel, to a receiver
Data Source
AI summary
Allocates identifiers of units of a tire pressure monitoring system to the positions of ABS-sensors which are each assigned to the wheels of the vehicle. The identifiers are contained in signals that are emitted by the units. Each unit, which is called a wheel electronic, has a pressure sensor, which is sensitive to the tire pressure of the wheel, a motion sensor, which provides information on the rotation speed of the wheel, a memory with the individual identifier of the wheel stored therein, and a transmitter, which transmits signals only containing information on the rotation speed of the respective wheel, to a receiver. An evaluation device receives the transmitted identifier and compares the information on the rotation speed of the wheel transmitted along with the identifier, with rotation speed information, which were acquired by the ABS sensors for the same time span and transferred to the evaluation device.