TPMS Wheel Unit Return-to-Service Logic
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Solution Overview
Problem
Existing direct Tire Pressure Monitoring Systems (TPMS) cannot automatically revert a detached wheel unit to its operational state, leading to hardware wastage and requiring manual reinitialization, which is inefficient and wasteful.
Innovation Solution
A TPMS system with a return-to-service module that automatically toggles a detached wheel unit to an operational state if specific conditions are met, including a pressure measurement at or below atmospheric pressure and successful reattachment, as indicated by acceleration or attachment parameters, without requiring additional operator action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wheel unit is declared detached, then the system ensures measurement integrity by scrapping the hardware, but this leads to hardware wastage and increased operational costs
Solution Approach 1:
The system changes the operational parameters of the wheel unit by toggling its state between detached and operational based on detected conditions. When specific conditions are met (such as pressure measurements indicating the wheel is back on the ground), the system automatically transitions the wheel unit from a detached state back to an operational state, allowing reuse without manual intervention.
Solution Approach 2:
The wheel unit system performs self-diagnosis and self-reactivation. The detached wheel unit automatically detects when it has been reattached to the wheel through sensor measurements (pressure, acceleration), and the system autonomously reactivates it without requiring manual reinitialization by operators, thereby reducing hardware wastage.
2Ease of operation
If manual reinitialization is required for detached wheel units, then operator control is maintained, but this increases operational complexity and time consumption
Solution Approach 1:
The system enables automatic return-to-service functionality where the TPMS autonomously reactivates detached wheel units based on sensor data analysis. The system monitors pressure measurements and acceleration data to determine when a detached wheel unit has been reattached, automatically toggling its state back to operational without requiring manual operator intervention, thus reducing operational time.
Solution Approach 2:
The system uses feedback from sensors (pressure sensors and accelerometers) to automatically determine when a detached wheel unit has been reattached. The continuous monitoring of pressure differential and acceleration patterns provides feedback that triggers automatic reactivation, eliminating the need for manual reinitialization procedures.
3Loss of substance
If automatic return-to-service is implemented, then hardware reuse is maximized, but this requires additional detection mechanisms and processing logic
Solution Approach 1:
The system uses existing multi-functional sensor components (pressure sensors and accelerometers) already present in the wheel unit for dual purposes: both for normal pressure monitoring and for detecting detachment/reattachment events. This approach enables automatic return-to-service functionality without adding dedicated detection hardware, thereby minimizing system complexity.
Solution Approach 2:
The system leverages changes in existing sensor parameters (pressure differential between inside and outside of the wheel unit, acceleration patterns) to detect detachment and reattachment events. By monitoring parameter changes in existing components rather than adding new sensors, the system achieves automatic hardware reuse capability with minimal increase in complexity.
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
Enables the autonomous reactivation of previously detached wheel units, reducing hardware wastage and operational costs by allowing for automatic return to service without manual reinitialization, while providing a diagnosis for operator decision-making.
Implementation Method 1
comprises in particular a pressure sensor of micro-electromechanical type
Implementation Method 2
a temperature sensor
Implementation Method 3
an emitter for dispatching information to an onboard computer of the vehicle by radio frequencies
Implementation Method 4
each wheel unit moreover integrates a radial accelerometer. When an acceleration is detected
Data Source
AI summary
A method and TPMS system including a central unit and wheel units. Each wheel unit including a pressure sensor, regularly transmitting pressure and radial acceleration measurements to the central unit. The latter used to calculate a detachment parameter for the wheel unit. A test module determines whether each wheel unit is in a detached or operational state. A return-to-service module toggles the state of a wheel unit from the detached to the operational state if: since the wheel unit was declared detached, a pressure less than or equal to a reference atmospheric pressure is measured while the vehicle was at rest, and if after this rest, at least one of: the detachment parameter has not attained a nominal detachment threshold in a first movement time; an attachment index corresponding to a particular shape of a measurement signal of the wheel unit has been detected under specific evaluation conditions, occurs.