Vehicle Backup Device Peak Current Reduction
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Solution Overview
Problem
Existing vehicle backup systems face challenges in efficiently managing peak current demand during backup operations, leading to increased size and cost of power storage units, especially when concurrently driving multiple high-current components like electric parking brake motors.
Innovation Solution
A backup device that controls a second power supply unit to intermittently discharge current to multiple drive sources, shifting instruction time periods to prevent concurrent peak current concentration, thereby reducing the required capacity and size of the power storage unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power storage unit is sized to provide sufficient power for concurrent operation of multiple drive sources during backup, then the backup reliability is improved, but the device size and cost increase
Solution Approach 1:
The control unit causes the second power supply unit to intermittently discharge current to multiple drive sources by shifting instruction time periods, creating periodic action patterns that prevent simultaneous peak current demands while ensuring all drive sources receive necessary power during backup operation
Solution Approach 2:
The system dynamically adjusts the discharge timing and duration to each drive source based on real-time power supply status and operational requirements, optimizing power distribution to match actual demand patterns rather than providing constant maximum power to all sources
2Reliability
If the power storage unit is sized to provide sufficient power for concurrent operation of multiple drive sources during backup, then the backup capability is improved, but the manufacturing cost increases
Solution Approach 1:
The control unit implements periodic discharge cycles with shifted timing for different drive sources, allowing the power storage unit to be smaller while still providing adequate backup capability through time-staggered power delivery that prevents simultaneous peak demands
Solution Approach 2:
The system changes operational parameters by adjusting discharge timing, duration, and intensity dynamically, allowing a smaller power storage unit to achieve the same effective backup capability through optimized discharge patterns rather than relying on raw capacity
3Productivity
If discharge current is applied simultaneously to multiple drive sources, then the operational efficiency is improved, but the peak current demand increases
Solution Approach 1:
The control unit applies discharge current in periodic pulses to different drive sources with shifted timing, ensuring all sources receive power efficiently while the intermittent nature of the discharge prevents peak current concentrations that would occur with simultaneous application
Data Source
AI summary
A backup device for a vehicle performs backup of a plurality of drive sources based on power supply from a second power supply unit even when power supply from a first power supply unit stops and reduces the peak voltage necessary in the backup operation. In a backup device, when an abnormal state of the power supply from a first power supply unit is detected, a control unit instructs a discharge unit to intermittently apply a discharge current a plurality of times to each of a plurality of motors and controls a supply destination of the discharge current such that each instruction time period during which the discharge unit is instructed to apply the discharge current to one motor is shifted with respect to each instruction time period during which the discharge unit is instructed to apply the discharge current to the other motor.