TPMS Wheel Unit Communication to Cut Battery Drain
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Solution Overview
Problem
Tire pressure monitoring systems (TPMS) face challenges in reducing power consumption of wheel unit batteries due to the need for frequent data transmission, especially in areas with limited radiofrequency coverage, which shortens the battery life and increases manufacturing costs.
Innovation Solution
A communication method that involves transmitting a set of frames from the wheel unit to the central processing unit, followed by an acknowledgement frame, and then interrupting further frame transmission once the acknowledgement is received, optimizing power consumption by reducing unnecessary exchanges and eliminating ineffective transmission channels and angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultra-high-frequency radio communication is used for data transmission, then communication speed and reliability are improved, but power consumption increases and battery service life decreases
Solution Approach 1:
The patent implements periodic transmission attempts at different angular positions instead of continuous transmission. The wheel unit transmits data frames at specific intervals corresponding to different wheel rotation angles, allowing the system to find optimal transmission angles while limiting overall power consumption.
Solution Approach 2:
The patent dynamically adjusts transmission parameters based on angular position. The system varies the transmission angle and timing according to wheel rotation, adapting the communication strategy to the changing spatial relationship between the wheel unit and central processing unit to maintain reliability while reducing energy use.
2Reliability
If multiple messages are transmitted to overcome blackspots, then communication reliability is improved, but battery service life decreases
Solution Approach 1:
The system performs periodic transmission attempts at different angular positions (e.g., every 90 degrees of wheel rotation) rather than continuous transmission. This periodic approach ensures coverage of different spatial zones to overcome blackspots while limiting the total number of transmissions to preserve battery life.
Solution Approach 2:
The patent transmits a limited number of data frames (e.g., 2-4 frames per rotation cycle) rather than exhaustive repeated transmissions. This partial action approach provides sufficient redundancy to overcome blackspots without the excessive energy consumption of continuous retransmission.
3Loss of information
If frequent data transmission is performed, then information accuracy is improved, but power consumption increases
Solution Approach 1:
The system transmits tire parameter information periodically at defined angular intervals rather than continuously. This ensures the central processing unit receives accurate, up-to-date information about tire pressure and temperature while limiting transmission frequency to reduce power consumption.
Solution Approach 2:
The system implements an acknowledgment mechanism where the central processing unit confirms receipt of data frames. This feedback allows the wheel unit to stop transmitting once successful communication is achieved, preventing unnecessary energy consumption while ensuring information accuracy.
Data Source
AI summary
A method for communication between a wheel unit and a central processing unit of a TPMS system, the wheel unit being intended for integration in a wheel of a motor vehicle. The method includes the following steps, which are aimed at: transmitting a set of transmission frames containing information relating to the wheel that is associated with the wheel unit; and sending an acknowledgement frame once the central processing unit has received a frame of the set of transmission frames transmitted by the wheel unit. The method includes a step which is aimed at interrupting the sending of a frame of said set of transmission frames transmitted by the wheel unit.