The implementation of hydrogen vehicles into the market necessitates having a universal fueling protocol for every vehicle. The goal is to achieve “customer acceptable” fueling, which means a full tank of hydrogen within a reasonable amount of time without exceeding the temperature, pressure, and density (state of charge) limits. However, fueling performance may be limited by the pre-cooling capacity of the station dispenser.
In March, SAE Technical Information Report J2601, “Fueling Protocols for Light Duty Gaseous Hydrogen Surface Vehicles,” was released, establishing the first industry-wide protocol for the fueling of gaseous hydrogen into on-road passenger vehicles operating with nominal working pressures of 35 and 70 MPa (5076 and 10,153 psi). Fueling stations are to employ fueling algorithms and equipment to conduct the fueling process within these guidelines. Vehicles filled at stations using these protocols should be designed appropriately for fueling, according to these guidelines.
The document establishes safety limits and performance requirements for gaseous hydrogen fuel dispensers. The criteria include maximum fuel temperature at the dispenser nozzle, maximum fuel flow rate, maximum rate of pressure increase, and other performance criteria based on the cooling capability of the station’s dispenser.
SAE J2601 establishes the first guideline worldwide for fuel-cell vehicle demonstration projects for fueling with hydrogen. This document was requested by the U.S. Department of Energy, U.S. Department of Transportation, California Air Resources Board, and the U.S. EPA.