TPMS Sensor Module Bidirectional Acknowledgment for Power Reduction
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Solution Overview
Problem
Tire Pressure Monitoring Systems (TPMS) face high power consumption due to unidirectional RF transmissions, leading to redundant data transmission to ensure receipt, which increases battery drain without feedback on successful data delivery.
Innovation Solution
Implementing a bidirectional communication link in TPMS sensor modules using Bluetooth transceivers, allowing for acknowledgement of message transmission, enabling the microcontroller to set the transceiver to standby mode upon successful acknowledgement and retransmit redundant messages only when acknowledgement is not received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant transmissions are performed to ensure data receipt in unidirectional TPMS, then reliability of data delivery is improved, but power consumption increases
Solution Approach 1:
The patent implements a bidirectional communication link where the central unit sends acknowledgment signals back to the sensor module to confirm successful data reception. This feedback mechanism eliminates the need for redundant transmissions by providing real-time confirmation of data delivery, thereby reducing power consumption while maintaining reliability
Solution Approach 2:
The system dynamically adjusts transmission behavior based on acknowledgment receipt. When acknowledgment is received, normal operation continues; when not received, the system automatically triggers redundant transmissions. This dynamic adaptation optimizes power consumption by performing redundant transmissions only when necessary
2Use of energy by moving object
If transmission interval is extended to reduce power consumption, then energy efficiency is improved, but data freshness and responsiveness deteriorate
Solution Approach 1:
The system uses acknowledgment feedback to trigger on-demand retransmissions without requiring fixed intervals. When data is successfully received, no further transmission is needed until the next measurement cycle. This self-service approach ensures data freshness is maintained only when necessary, optimizing energy efficiency
Data Source
AI summary
A method of acknowledging data transmissions for a tire pressure monitoring system (TPMS) sensor module includes generating tire pressure information based on measuring an internal air pressure of a tire; selectively operating a transceiver in an advertising mode and a standby mode; transmitting, by the transceiver, a message including the pressure information while in the advertising mode; on a condition that the transceiver receives, in the advertising mode, an acknowledgement in response to the transmitted message, setting the transceiver into the standby mode; while the transceiver is in the advertising mode and on a condition that the transceiver does not receive any acknowledgement in response to the transmitted message within a waiting period, instructing the transceiver to retransmit the message via a command; and retransmitting the message, by the transceiver, in the advertising mode after the waiting period in response to the command.