TPMS Wheel Electronics Identification Code Allocation
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Solution Overview
Problem
Existing methods for allocating identification codes in tire pressure monitoring systems are inefficient and prone to errors, requiring significant time and complexity to correctly associate wheel electronics with their respective positions, which hinders reliable tire pressure control.
Innovation Solution
The method utilizes wheel electronics with sensors for tire pressure, rolling direction, and shock detection, transmitting signals that include identification codes, rolling direction, and shock information, allowing the evaluation device to differentiate between left and right wheels based on shock timing and vehicle velocity, and allocate codes to specific axles using a tolerance-based calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If speed comparison method is used to allocate identification codes to wheel positions, then allocation can be performed automatically, but the process requires significant time and is prone to errors when speed measurements are similar
Solution Approach 1:
The patent introduces an intermediary variable 'n' representing the number of wheel revolutions, which serves as a mediator between the wheel electronics and the central control unit. This intermediary allows for more reliable allocation by comparing revolution counts rather than direct speed measurements, reducing errors when speeds are similar.
Solution Approach 2:
The system performs preliminary counting of wheel revolutions and stores this information in the wheel electronics before allocation is needed. This preliminary action of accumulating revolution data enables more accurate and reliable allocation decisions when the central control unit processes the information.
2Measurement precision
If complex signal comparison is used to match wheel electronics with wheel positions, then allocation precision can be improved, but the device complexity and processing requirements increase
Solution Approach 1:
The patent extracts only the essential information needed for allocation - the number of wheel revolutions - and stores this in a simplified format in the wheel electronics. This extraction of key data reduces the complexity of signal processing while maintaining allocation precision.
Solution Approach 2:
The system changes the parameter used for allocation from direct speed comparison to revolution count comparison. This parameter transformation simplifies the comparison process while improving reliability, as revolution counts are discrete and easier to compare accurately than continuous speed measurements.
3Reliability
If multiple sensors and complex evaluation are used to determine wheel position, then allocation reliability improves, but the time required for allocation increases
Solution Approach 1:
The wheel electronics continuously count and store the number of revolutions in advance, so when allocation is needed, the central control unit can quickly compare these pre-computed values without performing complex real-time calculations, reducing allocation time while maintaining reliability.
Solution Approach 2:
The patent replaces complex mechanical speed sensing and comparison systems with an electronic revolution counting system. This substitution simplifies the evaluation process and reduces the time required for allocation while maintaining or improving reliability through discrete count comparison.
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 approach enables rapid and reliable allocation of wheel electronics to their positions, reducing the time and complexity of the process while ensuring accurate tire pressure monitoring without the need for specific antenna positions or complex signal comparisons.
Implementation Method 1
the acceleration due to gravity superposes the radial acceleration and the tangential acceleration, the influence of said acceleration due to gravity changing its sign two times on each revolution of the wheel
Implementation Method 2
a transmitter which transmits signals to a receiver which is provided with or connected to an antenna provided on the body of the vehicle
Data Source
AI summary
Method for allocating identification codes which are contained in signals transmitted by components of a tire pressure monitoring system, said components being attached to wheels of the vehicle, to the wheel positions. A plurality of sensors to the tire pressure, to the rolling direction of the wheel, to the shocks, as well as a memory for the identification code, and a transmitter which supplies signals with the identification code, the rolling direction and the occurrence of a shock on a wheel to a receiver which, based on the supplied rolling direction information, distinguishes identification codes pertaining to wheels on the left-hand or right-hand side of the vehicle from shocks which occur on the left-hand or right-hand side of the vehicle, measures the time interval elapsing between shock signals on one side of the vehicle, multiplies this time interval by the velocity of the vehicle measured within the same time interval.