Backup Power Supply Control for Fast Emergency Load Readiness
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Solution Overview
Problem
Existing vehicle power supply systems face challenges in quickly determining if a backup power supply can operate an emergency load after transitioning from an OFF to an ON state, which delays autonomous driving capabilities due to the need for internal impedance measurement and estimation processing that takes several minutes.
Innovation Solution
A vehicle power supply system with a backup power supply control device that outputs a signal indicating the backup power supply's capability to operate an emergency load without executing the estimation processing if certain conditions are met, allowing for immediate determination of the backup power supply's state and enabling faster transition to autonomous driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backup power supply state estimation processing is executed to accurately determine whether the backup power supply can operate the emergency load, then the reliability of the power supply system is improved, but the time required for the system to transition from OFF to ON state is increased
Solution Approach 1:
The system performs preliminary measurements of voltage and current values during the normal operation phase (before transitioning to OFF state). These pre-acquired values are stored and reused when the system transitions from OFF to ON state, eliminating the need to perform time-consuming internal impedance measurements during the transition phase. This preliminary action resolves the contradiction by preparing data in advance that can be used for rapid state determination without sacrificing measurement accuracy.
Solution Approach 2:
The system dynamically adjusts its operation mode based on the current state. When transitioning from OFF to ON state, the system switches to a rapid determination mode that uses pre-acquired data rather than performing full estimation processing. This dynamic adaptation allows the system to optimize response time during critical transition phases while maintaining reliable assessment capabilities when time is not constrained.
2Measurement precision
If the internal impedance measurement is performed for a predetermined time to calculate the internal impedance with desired accuracy, then the measurement precision is improved, but the productivity of the system is reduced
Solution Approach 1:
The system performs the time-consuming internal impedance measurement and data acquisition during periods when the system is already operational and time is not critical. These preliminary measurements establish baseline values that can be used for rapid assessments during subsequent transitions. This approach maintains measurement precision by performing thorough measurements when possible, while improving productivity by avoiding repeated lengthy measurement cycles during time-sensitive operations.
Solution Approach 2:
Instead of performing new measurements during each transition, the system creates and uses copies of previously acquired voltage and current data. These data copies are stored in memory and reused for multiple state determinations, eliminating the need to repeatedly perform lengthy measurement sequences. This copying approach maintains measurement accuracy by relying on previously validated data while dramatically improving system response speed during transitions.
3Reliability
If the backup power supply control device waits to output the state determination signal until the estimation processing is completed, then the reliability of the signal is improved, but the time delay before autonomous driving can be executed is increased
Solution Approach 1:
The system performs preliminary acquisition and storage of voltage and current measurement data during normal operation, before any transition occurs. This pre-prepared data is immediately available when the system transitions from OFF to ON state, allowing the control device to rapidly determine the backup power supply state without waiting for new measurements to complete. This preliminary data preparation maintains signal reliability by using accurate pre-measured values while eliminating time delays during critical transitions.
Solution Approach 2:
During the transition from OFF to ON state, the system skips the time-consuming internal impedance measurement step and directly uses pre-acquired voltage and current values to determine the backup power supply state. This skipping of the lengthy measurement phase allows the system to rapidly output the state determination signal, enabling autonomous driving to be executed without delay while maintaining reliability by relying on previously validated measurement data.
Data Source
AI summary
A vehicle power supply system, being mounted on a vehicle, includes: a main power supply system including a main low-voltage power supply and a normal load; and a backup power supply system including a backup low-voltage power supply and an emergency important load and connected to the main power supply system. A backup power supply control device of the backup power supply system is configured to execute a backup low-voltage power supply state estimation processing, and output a signal indicating that the backup low-voltage power supply is in a state allowing supplying electric power for operating the emergency important load based on an estimation result of the backup low-voltage power supply state estimation processing, in a case in which the state of the vehicle does not satisfy a predetermined condition.