Fuel supply control method and system for fuel cells

A fuel supply control method for a fuel cell, utilizing a fuel tank storing highly concentrated fuel and a fuel deliver device delivering the fuel from the fuel tank to a fuel unit at a non-zero delivery velocity during operation of the fuel cell, so as to adjust the temperature of the fuel cell to be within a predetermined range, comprising:

• setting the delivery velocity of the fuel to the fuel unit to a non-zero predetermined fuel supply velocity to replenish the fuel that is consumed during operation;
• setting a predetermined temperature at which the fuel cell operates at optimum;
• detecting a system temperature of the fuel unit;
• calculating a difference between the predetermined temperature and the system temperature of the fuel unit;
• setting upper and lower limits for the temperature difference;
• and
• adjusting the delivery velocity to a non-zero first velocity according to the temperature difference;
• wherein the predetermined fuel supply velocity is one to seven times a fuel supply velocity required by the fuel cell to generate a current;
• wherein the first velocity is generated by decreasing the predetermined fuel supply velocity when the temperature difference exceeds the upper limit, and by increasing the predetermined fuel supply velocity when the temperature difference is lower than the lower limit.