Vehicle Event Recorder Battery Drainage Avoidance
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Solution Overview
Problem
Vehicle event recorders deplete vehicle batteries when the vehicle is not running, potentially causing the battery to drain completely, especially when they cut power during a sensitive state or reboot constantly, rendering them inoperable.
Innovation Solution
A system that includes a processor and power management circuitry to monitor the vehicle battery voltage, increasing the wake-up voltage threshold after each unsuccessful boot attempt, ensuring the vehicle alternator powers the event recorder instead of the battery, and shutting down to allow battery recovery when voltage drops below a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle event recorder operates continuously when the vehicle is not running, then the event recorder can monitor and record anomalies, but the vehicle battery will be depleted
Solution Approach 1:
The system continuously monitors vehicle battery voltage and uses this feedback to dynamically adjust the wake-up voltage threshold. When battery voltage drops below a safe threshold, the system automatically increases the wake-up voltage requirement, preventing the event recorder from operating and thus preventing further battery depletion. This closed-loop feedback mechanism resolves the contradiction by allowing event recording only when battery power is sufficient.
Solution Approach 2:
The wake-up voltage threshold is made dynamic rather than fixed. The system adjusts the threshold based on real-time battery voltage conditions, raising it when battery power is low and lowering it when battery power is sufficient. This dynamic adaptation allows the event recorder to operate reliably when power is available while preventing battery depletion when power is low.
2Device complexity
If the vehicle event recorder uses a fixed wake-up voltage threshold, then the system is simple to implement, but the event recorder may operate when battery voltage is too low causing incomplete boot cycles
Solution Approach 1:
The wake-up voltage threshold transitions from a fixed value to a dynamic value that adjusts based on battery conditions. The system monitors battery voltage and automatically modifies the threshold to ensure adequate power is available before allowing the event recorder to boot, preventing incomplete boot cycles while maintaining reasonable system complexity.
Solution Approach 2:
The system performs preliminary monitoring of battery voltage before allowing the event recorder to wake up. By checking battery conditions in advance and adjusting the wake-up threshold accordingly, the system ensures that the event recorder only attempts to boot when sufficient power is available, preventing failed boot cycles before they occur.
Data Source
AI summary
A system for drainage avoidance includes an interface and a processor. The interface is configured to receive an indication to power on. The processor is configured to query a wake up voltage threshold, perform a boot sequence, determine whether the boot sequence completed successfully, and in the event the boot sequence completed successfully, provide a reset indication to reset the wake up voltage threshold.