Tire Pressure Sensor Frequency Control via Dynamic Thresholds
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Solution Overview
Problem
Conventional tire air pressure detecting systems face challenges in optimizing transmitting frequency based on vehicle speed and air pressure changes, leading to either excessive energy consumption or inadequate monitoring during tire inflation or punctures.
Innovation Solution
A tire air pressure monitoring system that includes an air pressure detecting unit, a transmitting unit, a running state detecting unit, and a frequency adjustment section, which adjusts the transmitting frequency based on the vehicle's running state and air pressure change rate, setting variable threshold values to switch between low and high frequencies accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If both threshold values (vehicle speed and pressure fluctuation) are set to low values to increase transmitting frequency during tire inflation, then monitoring accuracy during inflation improves, but energy consumption increases during travel
Solution Approach 1:
The patent applies dynamics by making the threshold values variable rather than fixed. The first threshold value (vehicle speed threshold) and second threshold value (pressure fluctuation threshold) are dynamically adjusted based on the detected vehicle running state. When the vehicle is traveling, higher threshold values are used to reduce transmitting frequency and save energy. When the vehicle is stopped or moving slowly, lower threshold values are used to increase transmitting frequency and improve monitoring accuracy during tire inflation.
2Reliability
If both threshold values are set to high values to increase transmitting frequency during puncture detection, then response time to punctures improves, but monitoring capability during inflation deteriorates
Solution Approach 1:
The patent dynamically adjusts threshold values based on vehicle running state to resolve this contradiction. During vehicle travel, the system uses higher threshold values that trigger on significant pressure changes indicative of punctures or blowouts, ensuring rapid response to safety-critical events. During vehicle stop, the system switches to lower threshold values that are sensitive enough to detect the gradual pressure changes occurring during tire inflation.
3Reliability
If transmitting frequency is kept at high level to ensure monitoring during all conditions, then monitoring reliability improves, but energy consumption increases
Solution Approach 1:
The patent implements dynamic threshold adjustment based on vehicle running state to maintain monitoring reliability while reducing energy consumption. The system detects whether the vehicle is traveling or stopped, and accordingly adjusts the threshold values to appropriate levels. This ensures that transmitting frequency is high enough to reliably detect punctures during travel, while being reduced during travel periods to conserve battery power in the transmitter.
Solution Approach 2:
The patent changes the parameter values of the threshold settings based on operating conditions. By varying the first threshold value (vehicle speed threshold) and second threshold value (pressure fluctuation threshold) according to the vehicle running state, the system optimizes the balance between monitoring reliability and energy consumption for different operational scenarios.
Data Source
AI summary
A tire air pressure detecting device includes an air pressure detecting unit, a transmitting unit, a running state detecting unit, an air pressure change rate detecting section and a frequency adjustment section. The frequency adjustment section is configured to adjust a transmitting frequency at which the detected value of the tire air pressure detected by the air pressure detecting unit is externally transmitted by the transmitting unit according to the running state detected by the running state detecting unit and the air pressure change rate detected by the air pressure change rate detecting section. The frequency adjustment section is further configured to variably set a threshold value for switching the transmitting frequency from low frequency to high frequency according to the running state and the air pressure change rate.