Control method for high-pressure hydrogen vehicle fueling station dispensers

A method for filling a vehicle hydrogen storage vessel with hydrogen comprising the steps of:

• measuring an initial gas pressure in said vehicle hydrogen storage vessel;
• introducing a first portion of said hydrogen into said vehicle hydrogen storage vessel;
• interrupting flow of said hydrogen into said vehicle hydrogen storage vessel;
• making a first estimate of a volume of said vehicle hydrogen storage vessel;
• determining a first calculated amount of said hydrogen required to achieve a predetermined rated fill condition in said vehicle hydrogen storage vessel;
• introducing a second portion of said hydrogen into said vehicle hydrogen storage vessel until an actual amount of said hydrogen introduced into said vehicle hydrogen storage vessel substantially corresponds to said first calculated amount;
• determining a second calculated amount of said hydrogen to be introduced into said vehicle hydrogen storage vessel to achieve a full rated fill condition;
• and
• introducing a third portion of said hydrogen corresponding to said second calculated amount into said vehicle hydrogen storage vessel, resulting in said vehicle hydrogen storage vessel substantially filled with said hydrogen.