Backup Power Readiness Estimation for Vehicle Startup
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Solution Overview
Problem
Existing vehicle power supply systems cannot quickly determine if a backup low-voltage power supply is operational when transitioning from an OFF state to an ON state, leading to delays in autonomous driving and potential safety issues during abnormal conditions.
Innovation Solution
A vehicle power supply system with a backup power supply controller that estimates the state of the backup low-voltage power supply and outputs a signal indicating its readiness to operate emergency loads, using a switching device to connect or disconnect the backup power supply system with the main power supply system, and executes this estimation when the vehicle is turned off and meets specific conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the backup power supply state estimation processing is executed by measuring internal resistance for a predetermined time (5-10 minutes) to ensure accuracy, then the measurement precision is improved, but the loss of time increases significantly during vehicle startup
Solution Approach 1:
The system executes the backup power supply state estimation processing when the vehicle is in the OFF state, before the driver starts the vehicle. This preliminary action completes the time-consuming measurement (5-10 minutes) in advance, so that when the driver turns on the ignition, the estimation result is already available immediately, eliminating the delay during startup while maintaining measurement accuracy
2Loss of time
If the backup power supply state estimation processing is not executed during OFF state, then the loss of time during startup is reduced, but the reliability of autonomous driving determination deteriorates
Solution Approach 1:
The system performs the backup power supply state estimation processing in advance during the OFF state, storing the estimation result. When the vehicle transitions to ON state, this pre-computed result is immediately available for autonomous driving availability determination, ensuring both rapid response time and reliable decision-making
3Reliability
If the backup power supply state estimation processing is executed continuously, then the reliability of power supply status knowledge is improved, but the use of energy increases
Solution Approach 1:
The system executes the backup power supply state estimation processing periodically based on predetermined conditions (when vehicle is in OFF state for a certain duration, or when specific time intervals have elapsed), rather than continuously. This periodic execution maintains reliable knowledge of backup power supply status while significantly reducing energy consumption compared to continuous monitoring
Data Source
AI summary
A vehicle power supply system includes: a main power supply system provided with a main low-voltage power supply; and a backup power supply system provided with a backup low-voltage power supply. The backup power supply system includes a backup power supply controller. When the vehicle power supply system is turned off and a state of the vehicle satisfies a predetermined condition, the backup power supply controller executes a backup low-voltage power supply state estimation processing of estimating whether the backup low-voltage power supply is in a state in which the backup low-voltage power supply is able to supply electric power for operating the emergency important load.