Hydrogen Tank Filling Control for Refill Overheating Prevention
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Solution Overview
Problem
Existing hydrogen filling apparatuses fail to account for the heating of hydrogen tanks during multiple fillings, leading to potential overheating, especially when the tank temperature from previous fillings is not accurately transmitted or considered.
Innovation Solution
A hydrogen filling apparatus that includes a control device with a filling control map and processing circuitry to determine the tank's filling speed based on initial pressure, history, and outside air temperature, adjusting the speed to prevent overheating by using a lower speed if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the hydrogen tank is filled with hydrogen at a high filling speed corresponding to the initial pressure, then the filling efficiency is improved, but the hydrogen tank may overheat due to continuous filling operations
Solution Approach 1:
The filling speed is dynamically adjusted based on real-time tank temperature measurements and historical filling data. The control device modifies the filling speed from the initial high speed to a reduced speed when temperature thresholds are approached, resolving the contradiction between maintaining high productivity and preventing overheating through continuous adaptation.
Solution Approach 2:
The system implements feedback control by continuously monitoring tank temperature during filling operations and using this information to adjust the filling speed. Historical filling data is analyzed to predict temperature trends, and the control device responds by modulating the filling speed to keep the tank temperature within safe operating limits while maintaining efficient filling.
2Temperature
If the filling speed is reduced to prevent overheating, then the temperature control is improved, but the filling time increases
Solution Approach 1:
The system uses periodic action by analyzing historical filling data to identify patterns and predict when temperature control measures will be needed. This allows the system to maintain high filling speeds for most of the filling process and only reduce speed during critical periods when overheating is predicted, thereby minimizing the overall time loss while ensuring temperature control.
Solution Approach 2:
The system applies partial action by reducing the filling speed only for the portion of the filling process where temperature control is critical, rather than maintaining reduced speed throughout. The control device calculates the optimal point to reduce speed and the duration of reduction needed, allowing the majority of the filling to proceed at high speed while still preventing overheating.
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
Prevents overheating of hydrogen tanks by adjusting filling speeds based on historical data and current conditions, ensuring safe and efficient hydrogen filling.
Implementation Method 1
The temperature in the hydrogen tank (tank temperature) is affected by the compression heat or the like of the hydrogen filled in the hydrogen tank, and temporarily rises during hydrogen filling.
Data Source
AI summary
A hydrogen filling apparatus includes an initial pressure acquisition unit that acquires an initial pressure in a hydrogen tank, a history acquisition unit that acquires a filling history of a requesting vehicle, a determination unit that determines, based on the filling history, whether or not the hydrogen tank will overheat if the hydrogen tank is filled with hydrogen at a filling speed corresponding to the initial pressure, and a filling control unit that fills the hydrogen tank with hydrogen at a filling speed lower than the filling speed corresponding to the initial pressure, when it is determined that the hydrogen tank will overheat.