Wheel Location Detection Using TPMS Signal Patterns
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Solution Overview
Problem
Existing Tire Pressure Monitoring Systems (TPMS) face challenges in efficiently detecting changes in wheel location with minimal energy consumption, as current methods are either complex or not energy-efficient, and often result in unnecessary procedures due to infrequent wheel changes.
Innovation Solution
A method involving a monitoring step where wheel units emit messages at a determined rate when stationary, allowing the central unit to establish and record patterns based on signal strength, with variations compared to thresholds to detect location changes, and adapting emission rates based on pattern variations to optimize energy use and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If periodic transmissions of messages synchronized with a determined angular position are used to verify wheel unit location, then location accuracy is improved, but energy consumption increases
Solution Approach 1:
The system performs location verification only at specific periodic intervals (when the vehicle is stationary and the engine is started) rather than continuously, reducing energy consumption while maintaining location tracking accuracy
Solution Approach 2:
The system uses existing message transmissions between the central unit and wheel units for location verification purposes, rather than requiring separate dedicated verification transmissions, thereby reducing additional energy consumption
2Reliability
If location verification is performed at the start of each running cycle, then location tracking is maintained, but unnecessary procedures are performed since wheels change location less than once per year
Solution Approach 1:
The system dynamically adapts the verification frequency based on actual conditions - performing verification when the vehicle is stationary and at engine startup, but skipping routine verifications during normal operation when location is unlikely to change
Solution Approach 2:
The system changes the operational parameters of location verification based on vehicle state (stationary vs. moving, engine on vs. off), adjusting the verification frequency to match the actual probability of location change
3Difficulty of detecting and measuring
If supplementary components (low-frequency antenna, controller, wiring) are added to detect wheel unit location changes, then detection capability is improved, but device complexity increases
Solution Approach 1:
The existing message transmission system between the central unit and wheel units is used for multiple purposes - both for operational data exchange and for location verification, eliminating the need for separate dedicated verification components
Solution Approach 2:
The message transmission system acts as an intermediary that carries both operational data and location verification information, allowing location detection without requiring separate dedicated hardware components
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 effectively detects wheel location changes with reduced energy consumption and increased reliability, optimizing battery life and simplifying the detection process while minimizing unnecessary procedures.
Implementation Method 1
a monitoring step, during which each wheel unit emits series of messages to the central unit via the communications assembly depending on a determined emission rate, when the motor vehicle is at a standstill, and the central unit establishes and records, for each wheel unit, a first pattern representative of the location of the wheel unit in the motor vehicle, by measuring the power of said received messages
Data Source
AI summary
A method for detecting a change in location of the wheels of a motor vehicle, the vehicle having at least one central processing unit, and two wheel units which each includes an electronic assembly of sensors and which are each mounted on one of the wheels. The method including a monitoring step, during which a first pattern representative of the location of the wheel unit is established, when the vehicle is at a standstill, and an evaluation step, during which a possible first variation in each first pattern is measured to estimate if the location of the wheel has changed.