Patent ID: 6110611
Filing Date: 2000-08-29
Classification: B60L,H01M,Y02E,Y02T

Abstract:
An improved process for operating a polymer electrolyte membrane (PEM) fuel cell unit with at least one PEM fuel cell block and a speed-controlled compressor connected upstream of the at least one PEM fuel cell block, the improvement which comprises:controlling a change of an electrical current of the PEM fuel cell block from a value I to a new larger reference value I.sub.SN in a first step by setting a speed n of the speed-controlled compressor to a stipulated maximum value n.sub.M in the first step, the stipulated maximum value n.sub.M of the speed n being greater than a value n.sub.SN of the speed n corresponding to the new larger reference value I.sub.SN of the electrical current; andreducing the speed n of the speed-controlled compressor in a second step to the value n.sub.SN of the speed corresponding to the new larger reference value I.sub.SN.