Patent ID: 9317055
Filing Date: 2016-04-19
CPC Classification: G01R,G05F,H01M,Y02E,Y02T

Claim Text:
1. A sequential impedance measurement device in which impedance of a fuel cell is sequentially measured in a control system, the control system using a power indication value or a current indication value to control the fuel cell and a battery, the values being calculated by a control processor based on a load output value and an output indication value for a fuel cell system, the fuel cell system including the fuel cell and the battery and supplying power to a load, the device comprising: an M-sequence-signal-generating section which generates a binary or multi-valued M-sequence signal with a white power spectrum; a superimposed-signal-generating section which generates a superimposed signal superimposed on the M-sequence signal; a signal-processing section which combines the M-sequence signal and the superimposed signal or which separately outputs the M-sequence signal or the superimposed signal; a first signal-adding unit which superimposes and applies a signal output from the signal-processing section on the power indication value or the current indication value, the values being sent by the control processor; a second signal-adding unit which superimposes and applies a signal inverted from the signal output from the signal-processing section on the power indication value or the current indication value, the values being sent by the control processor; a current and voltage measuring unit which measures and incorporates a current and a voltage of the fuel cell, the fuel cell being controlled by a signal generated by the first signal-adding unit; and an impedance calculator which calculates the impedance of the fuel cell, the calculation based on values of the current and the voltage as measured by the current and voltage measuring unit, wherein a signal after the application in the second signal-adding unit is output to control the battery; and a calculation result of the impedance calculator is output as a measured result.