Dynamic Hydrogen Fueling Pressure Control
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Solution Overview
Problem
Current hydrogen fueling protocols, such as SAE J2601, are inefficient and overly complex, as they do not utilize vehicle data for safety-critical control functions, leading to excessive pre-cooling and longer fueling times, which increase costs and inconvenience customers, especially for heavy-duty vehicles with varying CHSS designs and higher flow rates.
Innovation Solution
The method involves communicating gas temperature and pressure measurements from the vehicle to the dispenser to calculate and modulate the pressure ramp rate, ensuring the gas temperature and state of charge reach target values efficiently, thereby optimizing fueling performance and reducing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative fueling protocols (SAE J2601) are used without vehicle data feedback, then safety is ensured under all conditions, but fueling times are longer and costs are higher due to excessive pre-cooling
Solution Approach 1:
The patent implements a feedback control system where the dispenser receives real-time temperature and pressure data from the vehicle's CHSS and dynamically adjusts the pressure ramp rate. This closed-loop feedback enables the system to respond to actual vehicle conditions rather than relying on conservative worst-case assumptions, thereby reducing fueling time while maintaining safety.
Solution Approach 2:
The patent transitions from static, pre-determined pressure ramp rates to dynamic, real-time adjustment of the pressure ramp rate based on actual vehicle CHSS conditions. This dynamic control allows the system to optimize fueling speed for each specific vehicle and operating condition, eliminating the excessive conservatism of fixed protocols.
2Reliability
If conservative fueling protocols with excessive pre-cooling are used, then safety margins are maintained, but station costs increase and fueling efficiency decreases
Solution Approach 1:
Real-time feedback from vehicle sensors enables the dispenser to determine the actual pre-cooling needs of each vehicle, eliminating unnecessary over-cooling. This allows the system to maintain adequate safety margins while avoiding the excessive energy consumption and reduced productivity caused by uniform conservative protocols.
Solution Approach 2:
The patent changes the operating parameters (pressure ramp rate, dispensing temperature) based on real-time vehicle conditions rather than using fixed conservative values. This parameter optimization reduces the excessive pre-cooling required by traditional protocols, improving both efficiency and productivity while maintaining safety.
3Adaptability or versatility
If SAE J2601 protocols are used for heavy-duty vehicles, then standardization is maintained, but the protocols are inadequate for vehicles with larger CHSS and higher flow rates
Solution Approach 1:
The patent implements dynamic pressure ramp rate adjustment that adapts to the specific characteristics of heavy-duty vehicles with larger CHSS and higher flow rates. This dynamic control enables the system to handle high flow rates appropriately while maintaining the standardized communication and control framework of SAE J2601.
Solution Approach 2:
The patent creates a universal solution that works across different vehicle types (light-duty and heavy-duty) by using real-time feedback to adapt to each vehicle's specific CHSS characteristics. This maintains the standardized interface and protocol framework while enabling appropriate performance for each vehicle class.
4Device complexity
If vehicle data is not used for control functions, then communication complexity is minimized, but fueling optimization is limited
Solution Approach 1:
The patent implements feedback control using real-time vehicle data (temperature and pressure measurements) to dynamically adjust the pressure ramp rate. This feedback mechanism optimizes fueling time by adapting to actual vehicle conditions while maintaining relatively simple communication protocols that build upon existing SAE J2601 standards.
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 reduces fueling times, lowers costs, and enhances efficiency by using real-time vehicle data for dynamic pressure control, addressing the inefficiencies and complexity of existing protocols, particularly benefiting heavy-duty vehicles.
Implementation Method 1
a gas temperature at which the gas is dispensed to the vehicle and the resulting gas temperature development in the tank during and after the fill
Data Source
AI summary
A method of filling a tank with gaseous fuel includes: delivering a gas from a filling station to the tank; communicating a gas temperature measurement and a gas pressure measurement from the tank to the filling station; and based on the gas temperature and gas pressure measurements, modulating a pressure ramp rate of the gas being delivered.