Vehicle Battery Isolation for Abnormal ECU Current Drain
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Solution Overview
Problem
Existing battery depletion prevention systems for vehicles fail to effectively manage abnormal current consumption by ECUs, leading to battery depletion even when the vehicle is not in use, due to factors like unexpected ECU routines or third-party apparatus interactions.
Innovation Solution
A battery depletion prevention system that includes a turn-off control apparatus, a power-supply monitoring apparatus, and a first switch. The system monitors current values flowing through the battery and determines abnormality. Upon detecting abnormality, it turns off the first switch to prevent battery depletion and notifies the user via a communication apparatus when the abnormality ceases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first switch is turned off to prevent battery depletion, then battery availability is improved, but communication with the user terminal cannot be performed
Solution Approach 1:
The power supply system is segmented into two independent circuits: one circuit controls power to in-vehicle apparatuses via the first switch, and another circuit maintains power to the communication apparatus via the second switch. This segmentation allows the first switch to be turned off for battery protection while the second switch remains on to enable communication functionality.
Solution Approach 2:
The communication apparatus acts as an intermediary that receives abnormality detection information from the turn-off control apparatus and transmits it to the user terminal. This intermediary role allows notification functionality to be preserved even when the main power switch is off.
2Adaptability or versatility
If ECUs are allowed to operate freely, then device functionality is improved, but battery depletion occurs due to abnormal current consumption
Solution Approach 1:
The power-supply monitoring apparatus continuously monitors current consumption and provides feedback to the turn-off control apparatus. When abnormal current consumption is detected, the control apparatus responds by turning off the first switch, creating a closed-loop feedback system that prevents battery depletion while allowing normal ECU operation.
Solution Approach 2:
The system performs preliminary monitoring of current values before battery depletion occurs. By detecting abnormal current consumption early and preemptively turning off the first switch, the system prevents energy loss before it becomes critical.
3Measurement precision
If monitoring is performed continuously, then abnormality detection precision is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous monitoring, the system performs periodic current value measurements at predetermined intervals. The power-supply monitoring apparatus measures current values periodically, and the turn-off control apparatus determines abnormality based on these periodic measurements, reducing energy consumption while maintaining adequate detection precision.
Data Source
AI summary
A battery depletion prevention system for a vehicle includes a turn-off control apparatus, a power-supply monitoring apparatus, and a first switch. The power-supply monitoring apparatus is configured to monitor a value of a current flowing through a battery. The first switch is provided between the battery and an in-vehicle apparatus and not between the battery and a communication apparatus. The turn-off control apparatus is configured to determine, based on the detected value of the current whether current value abnormality is occurring. The turn-off control apparatus is configured to, upon determining that the current value abnormality is occurring, turn off the first switch and thereby achieve a first coupling state. The turn-off control apparatus is configured to, upon determining that the current value abnormality is no longer occurring in the first coupling state, perform abnormality notification to a user terminal of a user of the vehicle via the communication apparatus.