Tire Pressure Monitoring Communication Device Power Management
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Solution Overview
Problem
Tire pressure monitoring systems face challenges in achieving low power consumption due to the small battery capacity and size constraints of tire communication devices, which are exacerbated by the need for frequent wireless communication of tire pressure data.
Innovation Solution
The implementation of a communication device with a normal operation mode and a low-power consumption mode, where the device transitions to Deep sleep mode to reduce power consumption by stopping voltage supply to RAM and reducing voltage to other memory units, allowing for efficient switching between operational modes to minimize current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tire communication device performs wireless communication at a predetermined communication interval, then the tire pressure data can be transmitted to the control device, but the power consumption increases due to frequent communication operations
Solution Approach 1:
The communication device operates in periodic cycles, alternating between normal operation mode and low-power consumption mode. During normal operation mode, the device transmits tire pressure data at predetermined intervals. During low-power consumption mode, the device stops or reduces communication operations. This periodic switching allows the system to maintain reliable data transmission while significantly reducing average power consumption, especially at shorter communication intervals where continuous operation would be most energy-intensive
2Use of energy by moving object
If the tire communication device transitions to low-power consumption mode by stopping voltage supply to RAM, then the power consumption is reduced, but the device requires longer time to return to normal operation mode
Solution Approach 1:
The memory system is segmented into two distinct parts: a first memory unit (RAM) that is completely stopped during low-power mode to maximize power savings, and a second memory unit that maintains reduced voltage supply to preserve data while consuming minimal power. This segmentation allows the device to achieve deep power reduction without requiring complete system reset, thereby reducing the time penalty associated with returning to normal operation mode
3Volume of moving object
If the tire communication device uses a small capacity battery due to size constraints, then the device can be mounted on the tire, but the battery life is limited and requires frequent replacement
Solution Approach 1:
The device employs periodic operation cycles alternating between normal and low-power modes, dramatically reducing average current consumption. This allows the small battery to last much longer despite the need for frequent data transmission at short communication intervals
Solution Approach 2:
The device dynamically adjusts its operational state based on communication requirements. During low-power consumption mode, the device minimizes all non-essential operations. When communication is needed, it transitions to normal operation mode, performs the necessary data transmission, then returns to low-power mode. This dynamic adaptation allows the system to extend battery life while maintaining communication functionality
Data Source
AI summary
A communication device of an embodiment includes a normal operation mode and a low-power consumption mode and includes a first memory unit, a second memory unit, and a control unit. The first memory unit includes a work area for execution of firmware configured to perform basic control of the communication device. The second memory unit stores software for communication with an external device. When transition is performed from the normal operation mode to the low-power consumption mode, the control unit stops voltage supply to the first memory unit and performs control to reduce voltage supplied to the second memory unit to lower than a voltage in the normal operation mode.