On-vehicle Battery Power Supply Redundancy
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Solution Overview
Problem
The control device for an on-vehicle electrical storage apparatus fails to operate due to abnormalities in the power supply, such as wire breakage or voltage drops, leading to potential overdischarge of the battery during vehicle collisions.
Innovation Solution
The apparatus includes a state-of-charge detector and a processor that manage battery discharge through multiple power supply paths, allowing power to be rerouted if an abnormality occurs in one path, ensuring stable operation and preventing overdischarge by switching to an auxiliary power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single power supply path is used for the control device, then the device complexity is reduced, but the reliability deteriorates when wire breakage or voltage drops occur
Solution Approach 1:
The power supply system is segmented into multiple independent power supply paths (first power supply path from first battery, second power supply path from second battery) that can operate independently. This segmentation allows the system to maintain control device operation even when one path experiences wire breakage or voltage drops, thereby improving reliability without excessive complexity.
Solution Approach 2:
The system changes the operational parameters by switching between different power supply sources based on detected abnormalities. When voltage drops or wire breakage is detected in one path, the system transitions to using the other power supply path, maintaining operational reliability through parameter adaptation.
2Reliability
If the battery discharge control is stopped due to power supply abnormalities, then the safety is improved, but the productivity deteriorates due to inability to prevent overdischarge
Solution Approach 1:
The power supply system acts as an intermediary between the battery and the control device, providing redundant power paths that ensure the control device remains operational during power supply abnormalities. This intermediary function allows the control device to continue managing battery discharge and preventing overdischarge even when one power supply path fails.
Solution Approach 2:
The system performs preliminary detection of power supply abnormalities (wire breakage, voltage drops) before they completely fail the control device. By detecting these abnormalities early through the state-of-charge detector and processor, the system can switch to the redundant power supply path proactively, maintaining discharge management capability.
3Reliability
If multiple power supply paths are provided, then the reliability is improved during collisions, but the device complexity increases
Solution Approach 1:
The power supply system is divided into two independent power supply paths, each with its own battery and wiring. This segmentation provides redundancy during collision events, ensuring that if one path is damaged, the other can maintain control device operation. The segmentation is implemented in a way that adds reliability without excessive complexity.
Solution Approach 2:
Both the first and second power supply paths serve the same function of powering the control device, providing multi-functionality. Either power supply path can independently support the control device operation, making the system universally capable of maintaining reliability even when one path fails during collision events.
Data Source
AI summary
An auxiliary battery which is a main power supply is used as power source electric power supplying means for supplying power source electric power to a control device, and an auxiliary power supply is further provided. When an abnormality occurs in the auxiliary battery, the power supply for supplying power source electric power to the control device is switched from the auxiliary battery to the auxiliary power supply by a power supply switching device, to operate the control device stably and perform discharging of a battery. Thus, the discharging can be stopped before the battery is overdischarged.