| CPC H01M 8/04776 (2013.01) [H01M 8/04089 (2013.01); H01M 8/04395 (2013.01); H01M 8/04753 (2013.01); H01M 2250/20 (2013.01)] | 4 Claims |
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1. A fuel cell system comprising:
a fuel cell,
an air compressor configured to supply oxidant gas to the fuel cell,
an oxidant gas supply flow path connecting the fuel cell to the air compressor,
an oxidant gas discharge flow path configured to discharge cathode off-gas, which is discharged from the fuel cell, to the outside,
an oxidant gas outlet valve disposed in the oxidant gas discharge flow path to control pressure of the oxidant gas,
a bypass flow path branching from the oxidant gas supply flow path, bypassing the fuel cell and being connected to the oxidant gas discharge flow path,
a bypass valve disposed in the bypass flow path to control an opening state of the bypass flow path,
an atmospheric pressure sensor configured to measure atmospheric pressure,
an outside temperature sensor configured to measure outside temperature,
a flow rate sensor configured to measure a flow rate of the oxidant gas supplied from the outside to an inlet of the air compressor,
a rotational frequency sensor configured to measure a rotational frequency of the air compressor,
an angle sensor configured to measure an opening degree of each of the valves that are the oxidant gas outlet valve and the bypass valve,
an intercooler between the air compressor of the oxidant gas supply flow path and the fuel cell,
a controller, and
a calculator configured to estimate a flow resistance Zd, total pressure, partial pressure and energy of each of members that are the intercooler, the air compressor, the oxidant gas outlet valve and the bypass valve,
wherein the air compressor is a turbo-type air compressor, and
wherein the calculator is configured to perform:
a step 1 in which the calculator calculates the flow resistance Zd (Pa/(mol/sec)) of each of the members by a predetermined first calculation formula obtained by linearization of a relationship between a flow rate ndot (mol/sec) and a differential pressure ΔP (Pa) of each of the members, from the flow rate of the oxidant gas measured by the flow rate sensor, the atmospheric pressure measured by the atmospheric pressure sensor, the rotational frequency of the air compressor measured by the rotational frequency sensor, and the opening degree of each of the valves that are the oxidant gas outlet valve and the bypass valve measured by the angle sensor;
a step 2 in which, after the step 1, the calculator calculates the total pressure of each of the members by a predetermined second calculation formula for total pressure calculation, from the flow resistance Zd of each of the members, the flow rate of the oxidant gas measured by the flow rate sensor, the atmospheric pressure measured by the atmospheric pressure sensor, and the outside temperature measured by the outside temperature sensor;
a step 3 in which, after the step 2, the calculator calculates the partial pressure of each of the members by a predetermined third calculation formula for partial pressure calculation, from the total pressure of each of the members calculated in the step 2 and a ratio of each of components contained in the oxidant gas; and
a step 4 in which, after the step 3, the calculator calculates the energy of each of the members by a predetermined fourth calculation formula for energy calculation, from the flow rate of the oxidant gas measured by the flow rate sensor, the atmospheric pressure measured by the atmospheric pressure sensor, and the outside temperature measured by the outside temperature sensor.
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