In-Vehicle Emergency Report Device Voltage Recovery Control
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Solution Overview
Problem
In-vehicle emergency report devices stop functioning when battery voltage decreases below a certain level, requiring a dedicated accessory battery to complete transmitting emergency reports, which adds cost and space requirements.
Innovation Solution
The device includes a control unit that starts, interrupts, and re-starts the emergency report operation based on battery voltage levels, allowing the operation to resume without an accessory battery by restarting from the initial or next procedure after voltage recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated accessory battery is mounted to ensure continuous emergency report transmission, then the reliability of emergency report operation is improved, but the device complexity and cost increase
Solution Approach 1:
The patent merges the emergency report transmission function with the vehicle's existing communication system (telematics system, navigation system, or mobile phone system). By utilizing the vehicle's existing communication infrastructure rather than building a separate dedicated transmission system, the patent achieves reliable emergency reporting without adding the complexity of a dedicated accessory battery and transmission unit.
Solution Approach 2:
The patent employs a multi-functional approach where the vehicle's existing communication system serves multiple purposes: normal vehicle telemetry, navigation, and emergency reporting. This universal system can dynamically switch between functions based on battery voltage levels, eliminating the need for separate dedicated hardware for emergency reporting.
2Strength
If the emergency report operation is interrupted when battery voltage decreases below a given level, then the battery is protected from damage, but the emergency report transmission reliability deteriorates
Solution Approach 1:
The patent implements dynamic voltage threshold adjustment based on the emergency report transmission state. When an emergency report is being transmitted, the voltage threshold for interrupting operation is raised above the normal threshold. This dynamic adjustment allows the system to protect the battery under normal conditions while ensuring emergency reports can complete transmission even when voltage drops, resolving the contradiction between battery protection and transmission reliability.
Solution Approach 2:
The patent uses feedback from the transmission unit about the current transmission state to dynamically adjust the voltage threshold. The control unit receives feedback regarding whether an emergency report is actively being transmitted and adjusts the interruption threshold accordingly, allowing higher voltage tolerance during critical transmission moments while maintaining battery protection during normal operation.
3Reliability
If the emergency report operation is re-started when battery voltage recovers after interruption, then the emergency report transmission completeness is improved, but the operation stability may deteriorate due to repeated interruptions
Solution Approach 1:
The patent performs preliminary actions by storing the transmission state and progress information in memory before voltage interruption occurs. When voltage recovers, the system uses this stored information to resume transmission without starting over, maintaining stability while ensuring completeness. The transmission unit and control unit work together to preserve transmission context across voltage fluctuations.
Data Source
AI summary
An in-vehicle emergency report device starts an operation for an emergency report to transmit an emergency report signal to a service center. The operation is interrupted when a battery voltage decreases less than a given voltage. The operation is thereafter re-started when the battery voltage returns to the given voltage or more. This allows all procedures of the emergency report operation to be completed.