Liquid Hydrogen Vessel Pressure Control for Refueling Preparation
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Solution Overview
Problem
Existing refueling technologies for liquid hydrogen storage vessels require reducing internal pressure before refueling, which can lead to reduced hydrogen supply to fuel cell systems due to increased pressure drop in piping, potentially causing a vicious cycle of reduced hydrogen supply and limited fuel cell system power.
Innovation Solution
A mobility system that includes a storage vessel for liquid hydrogen, a power train, and a control device that adjusts the target operating pressure of the storage vessel during refueling preparation, compares hydrogen supply pressure with a target pressure, and limits power train power when the supply pressure is insufficient, thereby preventing hydrogen shortages and maintaining system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the internal pressure of the storage vessel is reduced before refueling, then refueling efficiency is improved, but the differential pressure between the storage vessel and the fuel cell system decreases, reducing hydrogen supply amount
Solution Approach 1:
The control device performs preliminary action by reducing the target operating pressure of the storage vessel before refueling begins. This creates optimal conditions for rapid hydrogen injection into the storage vessel, maximizing refueling efficiency while the refueling process is ongoing.
Solution Approach 2:
The system dynamically adjusts the target operating pressure based on the refueling state. During refueling, the target pressure is reduced to facilitate hydrogen injection, but after refueling completes, the target pressure returns to normal operating levels, ensuring sufficient differential pressure for hydrogen supply to the fuel cell system.
2Quantity of substance
If the diameter of piping is increased to prevent pressure drop, then hydrogen supply is improved, but system assemblability deteriorates and pipe weight increases
Solution Approach 1:
Instead of changing the physical dimension (piping diameter) to solve the pressure drop problem, the system changes the operating parameter (target operating pressure of storage vessel) to achieve the same goal of ensuring sufficient hydrogen supply, thereby avoiding increased pipe weight and assembly complexity.
3Quantity of substance
If the diameter of piping is increased to prevent pressure drop, then hydrogen supply is improved, but pipe weight increases
Solution Approach 1:
The invention addresses the pressure drop issue by adjusting the target operating pressure parameter rather than increasing piping diameter, thereby preventing additional pipe weight while maintaining sufficient hydrogen supply to the fuel cell system.
Data Source
AI summary
A mobility includes a storage vessel, a power train configured to generate power using liquid hydrogen stored in the storage vessel, and a control device configured to downwardly adjust a target operating pressure of the storage vessel at a time of entering a refueling preparation mode, compare a supply pressure of the liquid hydrogen supplied to the power train with a target hydrogen supply pressure according to the target operating pressure, and limit the power of the power train in response to the supply pressure of the liquid hydrogen being less than the target hydrogen supply pressure.