Fuel Cell Vehicle Power Supply Control for Stable External Load
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Solution Overview
Problem
The external electric power supply system using a fuel cell and a secondary battery on a vehicle faces instability due to delayed reaction of the air compressor, leading to fluctuations in electric power generation that do not match the required external load, with existing solutions relying solely on secondary battery output without addressing this issue.
Innovation Solution
A method and system that control electric power generation of the fuel cell and charging/discharging of the secondary battery to set a supply allowed electric power value equal to or less than the upper limits of the secondary battery's charging and discharging capabilities, and the fuel cell's output, ensuring stable power supply by compensating with the secondary battery during power shortfalls and charging during surpluses, while protecting the electric power conversion unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the fuel cell generates electric power to meet external load requirements, then the external power supply capability is improved, but the power supply stability deteriorates due to delayed response from the air compressor
Solution Approach 1:
The secondary battery acts as an intermediary between the fuel cell and the external load. It absorbs power fluctuations from the fuel cell and provides supplemental power during transient demands, thereby stabilizing the external power supply while maintaining high power supply capability
Solution Approach 2:
The control system performs preliminary action by predicting external power requirements and pre-adjusting the operating states of both the fuel cell and secondary battery. This anticipatory control ensures that the power supply system responds promptly to load changes without instability
2Reliability
If the secondary battery is used to compensate for power shortfalls, then the power supply stability is improved, but the battery temperature and state of charge management becomes more complex
Solution Approach 1:
The control system dynamically adjusts battery management parameters such as charge/discharge current limits based on real-time temperature and state of charge measurements. This adaptive parameter adjustment maintains battery safety and performance while managing the complexity of battery operations
Solution Approach 2:
The system implements feedback control by continuously monitoring battery temperature and state of charge, and using this information to adjust the charge/discharge operations. This closed-loop control stabilizes battery operations while managing complexity through automated regulation
3Speed
If the supply allowed electric power is set to accommodate rapid power increases, then the external power supply responsiveness is improved, but the risk of damaging the power conversion unit increases
Solution Approach 1:
The control system applies beforehand cushioning by setting the supply allowed electric power to account for transient surges and fluctuations. This preventive measure cushions the power conversion unit against damaging peak loads while still allowing rapid power response to legitimate external demands
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures stable electric power supply to external loads by compensating for power generation delays and fluctuations, preventing damage to the power conversion unit and maintaining the secondary battery's state, thereby providing reliable and efficient power distribution.
Implementation Method 1
an external electric power supply system that supplies electric power to the outside by using a fuel cell and a secondary battery mounted on a vehicle
Implementation Method 2
a secondary battery mounted on a vehicle has been known
Data Source
AI summary
A method for controlling an external electric power supply system supplying electric power from a fuel cell and a secondary battery mounted on a vehicle to an external load, the method including controlling electric power from the fuel cell and the secondary battery such that externally supplied electric power supplied to the external load is equal to or less than supply allowed electric power, and setting the supply allowed electric power to be equal to or less than a smaller one of an upper limit value of electric power which the secondary battery is charged with set in accordance with a temperature, and an electric power storage amount of the secondary battery and an upper limit value of electric power discharged from the secondary battery set in accordance with the temperature and the electric power storage amount of the secondary battery.