Tire Pressure and Temperature Monitoring for Safe Leak Speed Control
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Solution Overview
Problem
Current Tyre Pressure Monitoring Systems (TPMS) are inadequate in providing reliable and timely alerts for tyre inflation defects, often leading to unnecessary stops, as they rely solely on pressure thresholds and fail to account for temperature variations and the specific rolling characteristics of tyres, especially with self-sealant products which can mask slow leaks.
Innovation Solution
A method that periodically measures tyre pressure and temperature, calculates a maximum safe speed setpoint based on inflation pressure thresholds, allowing drivers to adjust their speed according to the detected defect, thereby enabling continued safe operation beyond typical alert limits and reducing the risk of enforced stoppages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional TPMS alert systems use fixed pressure thresholds (e.g., 1.5 bar) to detect tyre defects, then early detection of inflation defects is achieved, but drivers are forced to stop unnecessarily even when safe continuation is possible
Solution Approach 1:
The system dynamically adjusts the maximum speed setpoint based on real-time tyre pressure measurements. When pressure is between threshold p2 and p1, the system calculates and transmits a reduced but non-zero maximum speed Vmax, allowing the vehicle to continue operating safely at lower speeds rather than forcing a complete stop. This dynamic adjustment resolves the contradiction by maintaining vehicle continuity while preserving detection reliability.
Solution Approach 2:
The system changes the operational parameters by introducing a speed setpoint parameter that varies with pressure levels. Instead of a binary stop/go decision at fixed pressure thresholds, the system implements a continuous parameter adjustment where Vmax decreases as pressure drops between p1 and p2, enabling safe vehicle continuation under modified operational conditions.
2Reliability
If TPMS systems transmit immediate stop alerts upon detecting pressure below threshold, then driver safety is prioritized, but unnecessary stops occur when tyres can still safely roll at reduced speeds
Solution Approach 1:
The system applies partial action by transmitting a reduced maximum speed setpoint rather than an immediate stop command when pressure is between thresholds p2 and p1. This partial alert allows the driver to continue driving at lower speeds, reducing unnecessary stoppage time while maintaining sufficient safety assurance through speed limitation.
Solution Approach 2:
The alert system transitions from static (immediate stop) to dynamic (speed-adjusted continuation). The system dynamically determines the appropriate response based on the degree of pressure degradation, allowing safe continuation at reduced speeds rather than uniformly forcing stops, thereby reducing time loss without compromising safety.
3Reliability
If self-sealant products are used in tyres to block perforations, then risk of flat tyres is reduced, but slow leaks may go undetected for extended periods
Solution Approach 1:
The system performs preliminary detection by continuously monitoring pressure and transmitting alerts at early stages of pressure loss (between thresholds p1 and p2), before the leak becomes severe or the tyre becomes unsafe. This preliminary action enables early intervention and informed driver decision-making about tyre replacement timing.
Solution Approach 2:
The system implements continuous feedback through periodic pressure and temperature measurements, calculating pressure evolution over time to detect slow leaks that self-sealant products may mask. The feedback mechanism provides ongoing information about tyre status, enabling timely detection of gradual pressure losses that would otherwise go unnoticed for extended periods.
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 allows for early detection and management of tyre leaks, enabling drivers to maintain safe speeds and avoid abrupt pressure drops, thus reducing the likelihood of tyre damage and enforced stoppages, even when pressure falls below conventional alert thresholds.
Implementation Method 1
sensors for measuring the pressure and the temperature of its internal cavity
Implementation Method 2
sensors for measuring the pressure and the temperature of its internal cavity
Implementation Method 3
heating due to the hysteretic losses of the mixtures of the components
Implementation Method 4
heat given off by the brakes
Data Source
AI summary
A method for processing inflation defects of a tyre of a vehicle is disclosed, the tyre being equipped with sensors for measuring the pressure and the temperature of the internal cavity of said tyre. The pressure and the temperature of the internal cavity of the tyre are measured periodically and, as soon as an inflation defect of a tyre is detected, an alert is signalled to the driver of the vehicle, in which there is also transmitted to the driver of the vehicle a maximum speed setpoint: which, when the measured inflation pressure of the tyre is greater than or equal to a first inflation pressure threshold value p1, is a first maximum speed setpoint value V1; and which, when the measured inflation pressure of the tyre is less than said first pressure threshold value p1 and greater than or equal to a second pressure threshold value p2, decreases as a function of said measured inflation pressure of the tyre.