Vehicle Backup Battery Control for Redundant Critical Loads
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Solution Overview
Problem
In vehicle power supply systems, there is a need for redundant power supply configurations not only during autonomous driving but also in situations where vehicle controls, such as brake controls, are motorized, requiring backup power to ensure continuous operation of critical loads.
Innovation Solution
A power supply control device that includes an acquisition unit for monitoring the power supply state of the vehicle, a diagnostic unit for assessing the condition of the backup battery, and a control unit that manages the electrical connection between the load and the backup battery, enabling a redundant power supply configuration when the backup battery is determined to be normal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a redundant power supply configuration is implemented using a main battery and a backup battery, then the reliability of power supply to critical loads is improved, but the device complexity and cost increase
Solution Approach 1:
The system performs preliminary diagnostics of the backup battery when the power supply state is switched from off to on, before actual power supply is needed. This advance checking ensures the backup battery is ready to take over if needed, establishing the redundant configuration proactively rather than reactively.
Solution Approach 2:
The electrical connection state between the load and backup battery is dynamically controlled based on diagnostic results. The control unit establishes a first state where power can be supplied from the backup battery when diagnosed as normal, and can switch to a second state where the backup battery is disconnected when abnormal, allowing flexible adaptation to system conditions.
2Reliability
If the backup battery is continuously connected to the load for redundant power supply, then the reliability is improved, but the energy consumption and potential battery degradation increase
Solution Approach 1:
The system dynamically adjusts the connection state between the backup battery and load based on real-time diagnostic results. When the backup battery is diagnosed as normal, it is connected in a first state enabling power supply. When diagnosed as abnormal, it is disconnected in a second state to prevent energy waste and potential damage from using a faulty battery.
Solution Approach 2:
The backup battery is extracted from the active power supply configuration when diagnostics indicate it is abnormal. Rather than continuously connecting it, the system removes the faulty battery from the circuit, preventing energy loss and potential harm while maintaining the ability to reconnect if the battery recovers.
3Reliability
If diagnostics of the backup battery are performed frequently, then the reliability of power supply is improved, but the processing time and system response delay increase
Solution Approach 1:
Diagnostics are performed preliminarily when the power supply state is switched from off to on, before the system actually needs power. This timing allows comprehensive checking without delaying critical power supply operations, as the diagnostic results are ready before power is needed.
Solution Approach 2:
Instead of continuous diagnostics, the system uses periodic diagnostics triggered by specific events (power supply state changes). This approach maintains reliability by checking at appropriate intervals while minimizing processing time and system burden compared to continuous monitoring.
Data Source
AI summary
A power supply control device for controlling power supply to a load of a vehicle using a first battery and a second battery, the power supply control device comprising: an acquisition unit that acquires a power supply state of the vehicle; a diagnostic unit that performs diagnosis of the second battery when the power supply state of the vehicle is switched from off to on; and a control unit that controls an electrical connection state between the load and the second battery, wherein the control unit controls the first state in which power can be supplied from the second battery to the load when the diagnosis unit diagnoses that the second battery is normal.