Vehicle AC Power Supply System with Priority Load Control
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Solution Overview
Problem
Conventional AC power supplying systems from vehicles to external electric loads face challenges in maintaining stable voltage output, leading to voltage drops and restricted load usage during power failures, as they cannot automatically switch from commercial to vehicle power sources due to differing power capacities.
Innovation Solution
An AC power supplying system with a control device that manages load distribution among electric loads based on priority and power capacity limits, ensuring the vehicle's power output does not exceed its generation capabilities, and automatically switches between commercial and vehicle power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is supplied from the vehicle as an emergency power source, then power supply continuity is maintained, but the AC voltage output suffers considerable voltage drop
Solution Approach 1:
The control device receives information about the power generation amount from the power supply apparatus and uses this feedback to control the load amount of electric loads. This closed-loop control ensures that the load does not exceed the available power generation capacity, preventing voltage drops and maintaining stable AC voltage output during emergency power supply from the vehicle.
Solution Approach 2:
The system dynamically adjusts the load amount of electric loads based on the real-time power generation amount from the vehicle's power supply apparatus. This dynamic control allows the system to adapt to changing power availability and maintain voltage stability under varying operating conditions.
2Adaptability or versatility
If the load amount of electric loads is not restricted, then all electric loads can operate simultaneously, but the AC voltage output suffers considerable voltage drop
Solution Approach 1:
The control device dynamically adjusts the load amount of electric loads based on real-time power generation capacity. This dynamic control enables the system to accommodate varying load requirements while maintaining voltage stability by preventing overloading conditions.
Solution Approach 2:
The system uses feedback from the power supply apparatus about available generation capacity to control the total load amount. This feedback mechanism ensures that the sum of individual load amounts does not exceed the power generation amount, maintaining voltage stability while allowing flexible load operation within available capacity.
3Reliability
If automatic switching between power sources is implemented, then power supply continuity is improved, but the system complexity increases
Solution Approach 1:
The control device automatically manages power source switching and load control based on information from the power supply apparatus without requiring manual intervention. The system self-regulates by receiving power generation amount information and autonomously controlling load amounts to prevent voltage drops, simplifying the overall control architecture while maintaining reliability.
4Power
If the power generation amount is increased to meet higher load demands, then the power supply capacity is improved, but the fuel consumption increases
Solution Approach 1:
The control device dynamically adjusts the load amount of electric loads to match the actual power generation amount from the vehicle's engine-driven generator. This dynamic matching prevents excessive power generation when full capacity is not needed, thereby reducing fuel consumption while ensuring adequate power supply for the connected loads.
Solution Approach 2:
The system changes the operational parameters by adjusting the load amount based on the power generation amount. This parameter adjustment ensures optimal utilization of the power generation capacity, matching power output to actual demand and avoiding unnecessary fuel consumption from over-generation.
Data Source
AI summary
Upon power failure of a commercial power source, an automatic switching device switches to power supply from a hybrid vehicle. An ECU of the vehicle, when receiving a request for generation of a commercial AC voltage, sets an upper-limit power generation amount based on a remaining amount of fuel. The ECU transmits the upper-limit power generation amount via an antenna to an on-premises ECU, while controlling a power generation amount based on the upper-limit power generation amount. The on-premises, when receiving the upper-limit power generation amount, controls the load state such that commercial AC power is supplied firstly to a first load of priority level 1, according to proprieties registered in advance, and such that the amount of the power supplied to the electric loads does not exceed the upper-limit power generation amount.