Vehicle Power Supply Management via Load Priority Control
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Solution Overview
Problem
Existing power supply systems for motor vehicles face challenges in stabilizing electric power distribution to multiple loads without compromising the total balance of functions, leading to potential deterioration of vehicle performance and increased costs due to complex battery and load status sensing mechanisms.
Innovation Solution
A power supply management system that detects operating conditions of electric loads, determines the maximum required power, and distributes it based on priority levels, ensuring stable power supply by restricting or switching power to loads as needed, using a generator and battery with load controllers and operation switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If battery status sensing means and load status sensing means are added to sense battery condition and load operating conditions, then power supply control accuracy is improved, but device complexity increases and manufacturing cost rises
Solution Approach 1:
The ECU utilizes existing sensor data from the vehicle's sensor network to determine battery state and load operating conditions, rather than adding dedicated sensing means. The system serves itself by processing readily available information from other vehicle systems, eliminating the need for additional sensing hardware while maintaining control accuracy
Solution Approach 2:
The ECU performs multiple functions including power supply control, battery state determination, and load condition assessment using its existing processing capabilities. Rather than adding specialized sensing devices, the system uses the universal computing resource to handle multiple tasks, reducing overall system complexity
2Reliability
If electric current is limited to prevent output voltage lowering, then power supply stability is improved, but loss of total balance of functions occurs and normal vehicle functions deteriorate
Solution Approach 1:
Instead of uniformly limiting electric current to all loads, the system selectively controls power supply to specific loads based on their operating conditions and priority. Each load receives appropriate power levels tailored to its needs, maintaining overall system functionality while ensuring power supply stability where critical
Solution Approach 2:
The power control unit dynamically adjusts electric current distribution based on real-time battery state and load conditions. Rather than applying fixed current limits, the system continuously adapts power allocation to maintain both stability and functional balance, allowing normal vehicle operations to continue while preventing voltage collapse
3Power
If output electric current from vehicle-mounted generators is increased, then power supply capacity is improved, but generation efficiency decreases and output voltage lowers due to shortages
Solution Approach 1:
The system implements feedback control by continuously monitoring battery state and load conditions, then adjusting generator output and power distribution accordingly. This closed-loop control optimizes generation efficiency while meeting power demands, preventing the efficiency losses that would occur with simply increasing generator capacity
Data Source
AI summary
A power supply management system includes means for detecting required electric power supply from electric loads installed in the motor vehicle, means for determining a distribution of amounts of the electric power to be distributed to the electric loads from an electric power resource in the motor vehicle based on the requirements of the supply of the electric power from the electric loads, and means for supplying one of amounts of the electric power to a corresponding one of the electric loads in accordance with the distribution of the amounts of the electric power.