Tire Pressure Monitoring Using Vehicle Stop Time for Temperature Estimation
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Solution Overview
Problem
Current Tire Pressure Monitoring Systems (TPMS) face inefficiencies in estimating external tire temperatures, leading to errors in pressure calculations and unnecessary battery power consumption when monitoring vehicle stop states.
Innovation Solution
A tire pressure monitoring apparatus and method that uses a sensor transmitter to measure and transmit vehicle stop time via wireless communication, allowing a sensor receiver to estimate external temperature and calculate tire pressure, thereby reducing power waste and improving accuracy in monitoring tire pressure states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the TPMS sensor continuously monitors vehicle stop state to estimate external temperature, then the accuracy of tire pressure calculation is improved, but the battery power consumption increases
Solution Approach 1:
The system performs RF transmission periodically based on internal pressure changes rather than continuously monitoring. The sensor compares currently sensed pressure with previously sensed pressure and only transmits when a pressure change equal to a certain threshold occurs, reducing energy consumption while maintaining monitoring effectiveness
Solution Approach 2:
The system uses internally generated pressure change events to trigger external temperature estimation and RF transmission, rather than relying on continuous external triggering. The sensor serves itself by using its own pressure sensing capability to determine when communication is necessary
2Reliability
If the TPMS sensor performs RF transmission based on every pressure change, then the monitoring accuracy is improved, but the power consumption and communication overhead increase
Solution Approach 1:
The system changes the triggering parameter from continuous monitoring to threshold-based pressure change detection. RF transmission is triggered only when pressure change reaches a predetermined threshold, filtering out minor fluctuations that would otherwise cause unnecessary transmissions and power consumption
Solution Approach 2:
The system performs partial monitoring by only responding to significant pressure changes rather than all pressure variations. This selective approach maintains reliability for actual tire issues while avoiding excessive reactions to normal pressure fluctuations
3Measurement precision
If the system uses vehicle stop time to estimate external temperature, then the temperature estimation accuracy is improved, but the device complexity increases
Solution Approach 1:
The system uses the existing pressure sensor and controller to perform multiple functions: pressure detection, temperature compensation calculation, and triggering RF transmission. This multi-functionality approach avoids adding separate dedicated components for each function, maintaining simplicity while achieving accurate temperature estimation
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 accurate tire pressure monitoring and reduces power consumption by estimating external temperature using stop time data, minimizing errors in pressure calculations and conserving battery power.
Implementation Method 1
The pressure sensor 11 senses an internal pressure of a tire to detect a low pressure and a pressure change
Implementation Method 2
The temperature sensor 13 senses an internal temperature of a tire to correct an error of the pressure sensor
Implementation Method 3
The acceleration sensor 15 senses an acceleration and a speed to determine whether a vehicle is running and detect a sensor position
Implementation Method 4
The supply voltage sensor 17 measures a voltage of a battery 25, which is provided in the TPMS sensor
Implementation Method 5
the TPMS sensor periodically performs RF transmission
Implementation Method 6
a pressure change based on an ideal gas equation expressed as the following Equation (1) occurs
Data Source
AI summary
Provided is an apparatus for estimating an external temperature for monitoring a tire pressure. The apparatus includes a sensor transmitter configured to transmit stop time information which is obtained by measuring a stop time of a vehicle at certain intervals, by using wireless communication, and a sensor receiver configured to receive the stop time information through the wireless communication, and measure the external temperature by using the received stop time information.