Tire Pressure Monitoring System Spare Tire Recognition
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Solution Overview
Problem
Current tire pressure monitoring systems (TPMS) cannot accurately distinguish a spare tire from other tires without using a registration tool, leading to difficulties in recognizing the spare tire during tire rotation and potential errors in detecting tire pressure abnormalities.
Innovation Solution
A TPMS that includes tire air pressure detectors configured to transmit signals only when rotated, with a receiver featuring a tire recognition unit that monitors signal reception over fixed periods to differentiate between traveling tires and the spare tire based on the number of missed signal periods, allowing for spare tire recognition without a registration tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the vehicle uses a registration tool to register tire IDs and distinguish spare tires, then the spare tire recognition accuracy is improved, but the device complexity and operation difficulty increase
Solution Approach 1:
The system automatically distinguishes the spare tire by monitoring signal reception over fixed periods without requiring external registration tools. The tire recognition unit autonomously performs the differentiation based on signal absence patterns, eliminating the need for manual registration processes and external tools.
Solution Approach 2:
The system pre-establishes the differentiation criterion that traveling tires will transmit signals during rotation while the spare tire will not. By monitoring signal reception over fixed periods in advance, the system prepares the distinction before any tire rotation operation occurs, enabling automatic recognition without subsequent registration steps.
2Measurement precision
If the vehicle monitors signal reception continuously to distinguish spare tires, then the spare tire recognition accuracy is improved, but the loss of time increases
Solution Approach 1:
The tire recognition unit monitors signal reception at fixed periodic intervals rather than continuously. By checking signal reception over predetermined fixed periods and comparing the number of periods with missed signals, the system achieves accurate spare tire recognition while minimizing the total monitoring time required.
3Use of energy by moving object
If the tire air pressure detectors transmit signals only when rotated, then the energy consumption is reduced, but the difficulty of detecting and measuring increases
Solution Approach 1:
The tire air pressure detectors dynamically adjust their transmission behavior based on rotation detection. When the detector determines the tire is rotating, it transmits signals; when stationary, it remains silent. This dynamic operation reduces energy consumption while the rotation detection mechanism maintains measurement accuracy by adapting to the operational state.
Data Source
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AI summary
A tire pressure monitoring system includes tire air pressure detectors (4), arranged on tires (2) and configured to transmit a tire air pressure signal including pressure data and a tire ID only when the tire is rotated, and a receiver (13), arranged on a vehicle body (5) and capable of receiving the signal from each tire air pressure detector (4). The receiver (13) includes a tire recognition unit (22) configured to monitor whether or not the signal is received from each tire air pressure detector (4) over fixed periods and during each fixed period, obtain a number of the fixed periods during which the signal is not received for each tire air pressure detector (4), and recognize whether each tire is a traveling tire or a spare tire based on the number of the fixed periods that is obtained for the corresponding tire air pressure detector (4).