Tire Pressure Monitoring Signal Timing Control
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Solution Overview
Problem
Existing tire pressure monitoring systems face issues with receiving accurate air pressure signals due to interference between signals from multiple detection devices and the selection of erroneous signals, especially when multiple air pressure signals are transmitted simultaneously or from adjacent vehicles.
Innovation Solution
The system includes detection devices that measure the signal strength of request signals and transmit air pressure signals at different timings based on this strength, and a monitoring device that selects and updates air pressure information from specific tire positions using a sensor identifier table and received signal strength storage, reducing interference and ensuring accurate monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple detection devices transmit air pressure signals simultaneously in response to a request signal, then the monitoring device can obtain air pressure information from multiple tires, but signal interference occurs between the air pressure signals preventing the monitoring device from receiving them
Solution Approach 1:
The patent implements periodic transmission of air pressure signals by detection devices at different timings, rather than simultaneous transmission. Each detection device transmits its air pressure signal sequentially after receiving a request signal, creating a periodic transmission pattern that eliminates signal interference while maintaining efficient information acquisition from multiple tires
Solution Approach 2:
The patent segments the simultaneous transmission process into multiple sequential transmission events. Instead of all detection devices transmitting at once, each device transmits its air pressure signal in separate time slots, dividing the overall transmission task into manageable segments that avoid interference
2Productivity
If a request signal is transmitted to detect air pressure of all tires, then air pressure information from multiple tires can be obtained, but detection devices from adjacent vehicles may also respond causing erroneous monitoring
Solution Approach 1:
The patent applies local quality by having each transmitting antenna transmit request signals with different characteristics (such as different frequencies or modulation patterns) directed toward specific tire positions. This allows the monitoring device to distinguish between signals from different vehicles based on the local characteristics of each request signal, ensuring accurate identification of air pressure data from its own tires only
Solution Approach 2:
The system implements feedback mechanisms where the monitoring device receives air pressure signals and validates them against expected patterns or identifiers. This feedback loop ensures that only valid air pressure information from the vehicle's own tires is processed, while signals from adjacent vehicles are identified and excluded
3Device complexity
If detection devices transmit air pressure signals at the same timing, then the monitoring process is simplified, but interference occurs between signals making reception impossible
Solution Approach 1:
The patent introduces periodic timing control where detection devices transmit air pressure signals at different time intervals rather than simultaneously. This periodic transmission approach maintains relatively simple control logic while ensuring that signals do not overlap in time, thereby preserving reception reliability without significantly increasing system 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
This approach allows for normal monitoring of air pressure even in situations with multiple signal transmissions, reducing interference and ensuring accurate reporting and updating of air pressure information for each tire.
Implementation Method 1
a measurement unit that measures a received signal strength of the request signal received by the request signal receiving unit
Implementation Method 2
an air pressure signal transmitting unit that transmits to the monitoring device an air pressure signal including air pressure information obtained by detection at a different timing in accordance with the received signal strength measured by the measurement unit
Data Source
AI summary
A tire pressure monitoring system includes a plurality of detection devices that are provided in respective ones of a plurality of tires of a vehicle and each wirelessly transmit an air pressure signal including air pressure information of tire in response to a request signal and a monitoring device that transmits the request signal to each of the detection devices and receives the air pressure signal transmitted from each of the detection devices in response to the request signal, to monitor air pressure of each of the tires. Each of the detection devices, when receiving a request signal, measures the received signal strength of the received request signal and transmits to the monitoring device an air pressure signal at a different diming in accordance with the measured received signal strength. The monitoring device receives the air pressure signals transmitted from the plurality of detection devices at different timings.