Telematics Wake Interval Adjustment Based on Battery Charge
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Solution Overview
Problem
Telematics devices used for tracking mobile assets face challenges in power management due to intermittent access to external power sources, leading to inefficient power consumption and unreliable operation, especially when the battery charge is low.
Innovation Solution
A method and system that adjust the wake interval of a telematics device based on the battery charge level, providing full power during wake durations and limited power during wake intervals to optimize power usage and ensure prompt asset location while maintaining battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the device enters low-power mode during periods when no external power source is available, then power consumption is reduced, but the device cannot provide prompt location responses when polled
Solution Approach 1:
The wake interval is made dynamic rather than fixed, allowing the device to adjust its sleep-wake cycle based on battery charge level. When charge is high, the device can sleep longer to conserve power. When charge is low, the device wakes more frequently to ensure prompt responses, thus resolving the contradiction between power conservation and response speed.
Solution Approach 2:
The system changes the parameter of wake interval based on battery charge level. By monitoring charge level and adjusting the wake interval accordingly, the device optimizes the balance between power consumption and response time, ensuring that location requests are answered promptly when power is available while conserving power when battery charge is high.
2Loss of energy
If the device wakes up at fixed intervals to permit tracking, then power consumption is reduced, but the device will often be in sleep mode when polled, resulting in delayed location responses
Solution Approach 1:
The system implements feedback by monitoring battery charge level and using this information to adjust the wake interval. This feedback mechanism ensures that the device wakes up frequently enough to maintain reliable location tracking when power is available, while still conserving power during extended sleep periods when battery charge is high.
3Productivity
If the battery charge reaches zero or falls below a predetermined level, the device turns off without notice, but this is undesirable for tracking valuable or perishable cargo
Solution Approach 1:
The device takes preliminary action by monitoring battery charge level and adjusting wake intervals in advance before complete discharge occurs. When charge falls below a threshold, the device increases wake frequency to ensure continuous tracking capability, preventing the scenario where the device simply turns off without notice and maintaining reliability for valuable cargo.
Data Source
AI summary
A method and system are disclosed for adjusting a wake interval in a telematics device having a charge sensor. The telematics device cyclically provides full power from a power supply during a wake duration, and limited power from the power supply during the wake interval. A charge level for a battery of the power supply is determined using the charge sensor. The wake interval is adjusted based on the charge level.