Power Source Control Device for Autonomous Driving Voltage Maintenance
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Solution Overview
Problem
Existing power source systems fail to effectively maintain sub-battery voltage during autonomous driving when the main power source fails, leading to potential drops in backup voltage due to current flow and time passage.
Innovation Solution
A power source control device equipped with a detector and controller that monitors the main power source failure and performs operational control to maintain a predetermined guaranteed voltage by managing power supply to components, including prioritizing components that draw inrush current and limiting power to interruptible components, thereby extending the time before voltage drops to the guaranteed level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sub battery supplies power to components during autonomous driving after main power source failure, then the vehicle can maintain operational capability, but the sub battery voltage drops below the guaranteed voltage level
Solution Approach 1:
The controller proactively identifies components that draw inrush current and forces their operation before the sub battery voltage drops to the guaranteed voltage level. This preliminary action ensures these critical components receive adequate power before voltage degradation occurs, maintaining operational reliability while managing the voltage drop trajectory.
Solution Approach 2:
The controller dynamically changes the power supply parameters by selectively limiting power to interruptible components based on real-time voltage monitoring. When voltage approaches the guaranteed level, the controller adjusts which components receive power, changing the power distribution parameters to extend the time before voltage drops below the guaranteed threshold.
2Duration of action of moving object
If the sub battery supplies power for an extended duration, then the vehicle maintains operational capability longer, but the voltage drops to the guaranteed voltage or below
Solution Approach 1:
The controller forces operation of inrush current-drawing components at predetermined timings before voltage drop becomes critical. This timing-based preliminary action extends the effective operational duration by ensuring these components operate during the higher voltage window, before the voltage reaches the guaranteed threshold.
Solution Approach 2:
The controller implements periodic monitoring of sub battery voltage and dynamically adjusts power distribution in periodic intervals. By continuously cycling through voltage checks and component prioritization, the system extends operational duration while maintaining voltage above the guaranteed level for as long as possible.
3Reliability
If components that draw inrush current are operated, then critical functions are ensured, but the voltage drops rapidly
Solution Approach 1:
The controller identifies and forces operation of inrush current-drawing components at predetermined timings before voltage drop becomes critical. This ensures these critical components receive adequate power during the higher voltage window, maintaining their reliability while managing the overall voltage maintenance time.
Solution Approach 2:
The controller maintains continuous monitoring and adjustment of power distribution to components. By continuously managing which components operate and when, the system ensures critical functions remain operational while extending the overall time that voltage stays above the guaranteed level through optimized power allocation.
Data Source
AI summary
A redundant power source ECU detects for failure of a power source of a primary system from a first DC-to-DC converter. In cases in which a failure has been detected during autonomous driving, the redundant power source ECU performs control to cause operation by a sub battery of a predetermined secondary system component that draws an inrush current, regardless of whether or not operation has been requested.