Tire Pressure Monitoring with Temperature-Compensated Setpoints
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Solution Overview
Problem
Current methods for inflating and controlling tire pressure in vehicles often result in under or over-inflation due to temperature variations and lack of consideration for tire heating, leading to decreased performance, wear, and comfort issues, even with Tire Pressure Monitoring Systems (TPMS), as drivers struggle to adjust pressures accurately, especially when tires are hot or have been driven long distances.
Innovation Solution
A method and device that detect tire pressure and temperature, using a corrected setpoint pressure formula based on reference temperatures measured during vehicle starts, to ensure accurate inflation regardless of tire state, with a system that provides re-inflation assistance and alerts drivers to optimal pressure levels through a user-friendly interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If tire pressure is adjusted to the setpoint value recommended by the manufacturer, then the tire pressure meets the manufacturer's specification, but the tires may be underinflated when they are in a hot state due to temperature rise during driving
Solution Approach 1:
The system dynamically adjusts the target pressure parameter based on tire temperature measurements. When tires are hot, the system increases the target pressure above the manufacturer's cold setpoint value to compensate for thermal expansion, ensuring accurate inflation regardless of tire temperature state
Solution Approach 2:
The system continuously monitors tire pressure and temperature, using feedback from temperature sensors to dynamically adjust pressure recommendations. This closed-loop approach allows the system to account for temperature variations and provide accurate inflation guidance in real-time
2Reliability
If drivers systematically inflate tires by adding 0.3 to 0.4 bar to the setpoint value to account for temperature rise, then the tires remain adequately inflated when cold, but this can lead to excessive inflation and degraded performance when tires are cold
Solution Approach 1:
The system transitions from static pressure recommendations to dynamic pressure adjustment based on real-time temperature conditions. The target pressure is no longer fixed but varies continuously with tire temperature, optimizing performance for both cold and hot states without manual intervention
Solution Approach 2:
The system automatically determines the appropriate target pressure based on measured tire temperature, eliminating the need for drivers to manually calculate or estimate temperature compensation. The system self-adjusts the inflation target based on actual tire conditions
3Reliability
If TPMS alarm threshold is set close to the recommended set value, then the system provides timely warning of pressure loss, but it triggers false alarms during temperature variations when no actual pressure problem exists
Solution Approach 1:
The alarm threshold parameter is dynamically adjusted based on tire temperature. When tires are hot, the threshold is raised above the cold setpoint value to account for thermal expansion, preventing false alarms while maintaining sensitivity to actual pressure problems
Solution Approach 2:
The system preemptively adjusts the alarm threshold based on predicted temperature effects before actual pressure deviations occur. By anticipating temperature-related pressure changes, the system prevents false alarms while maintaining accurate monitoring of genuine pressure issues
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 solution ensures tires are inflated to the correct pressure, accounting for temperature changes, reducing wear and performance issues, and providing clear guidance to drivers for optimal tire pressure, thereby enhancing vehicle handling and comfort.
Implementation Method 1
a pressure sensor and/or a pressure variation detector
Implementation Method 2
a device for detecting the temperature associated with the various tires of the vehicle
Implementation Method 3
the analysis means compare the current value of the inflation pressure of the tire with a setpoint pressure corrected as a function of the temperature of the tire
Data Source
Figure 1
Figure 1
AI summary
The invention relates to a method for monitoring the inflation pressure and assisting in the reinflation of a tire of a wheel of a vehicle equipped with system specific to the vehicle for monitoring the inflation pressure of the tires comprising devices for detecting the pressure and the temperature of the tires of the vehicle and means for analyzing these pressure and temperature values. The invention is characterized in that the analyzing means compare the actual value of the inflation pressure of the tire to a set pressure corrected according to the temperature of the tire furnished by the device for detecting the temperature of the tire concerned and corresponding to a reference temperature according to the temperatures measured during previous startups of the vehicle.