Fuel cell system and method of controlling fuel cell

Abstract

The present invention relates to a fuel cell system and a method for controlling a fuel cell which ensure accurate feedback control of the opening degree of a pressure regulating valve and the opening degree of a bypass valve. A fuel cell system (1) is provided with an air inflow passage (21), a fuel cell (10) provided with an air passage (10a), an air outflow passage (23), a compressor (22), a pressure regulating valve (24), a bypass passage (27), and a bypass valve (28). A first threshold value is calculated on the basis of the FC inlet pressure lower limit value, and when it is determined that the FC inlet pressure command value is lower than the first threshold value and the FC pressure loss lower limit value is greater than the bypass pressure loss lower limit value, feedback control of the opening degree of the pressure regulating valve is stopped without stopping feedback control of the opening degree of the bypass valve, and feedback control of the opening degree of the pressure regulating valve is stopped without stopping feedback control of the opening degree of the pressure regulating valve. When it is determined that the bypass pressure loss lower limit value is greater than the FC pressure loss lower limit value, the feedback control of the opening degree of the pressure regulating valve is not stopped, but the feedback control of the opening degree of the bypass valve is stopped.

Description

technical field [0001] The present disclosure relates to fuel cell systems and methods of controlling fuel cells. Background technique [0002] The following fuel cell systems are known. The fuel cell system includes: a fuel cell with an air passage; an air inflow passage connected to an inlet of the air passage; an air outflow passage connected to an outlet of the air passage; and a compressor arranged in the air inflow passage. Inside; the pressure regulating valve, configured in the air outflow path; the bypass passage bypasses the fuel cell and extends from the branch point on the air inflow road downstream of the compressor to the confluence point on the air outflow road downstream of the pressure regulating valve; the bypass valve, Arranged in the bypass passage; the FC path, from the branch point through the air inflow path, the air passage, and the air outflow path including the pressure regulating valve in order to the confluence point; and the bypass path, from the...

AI Technical Summary

Problems solved by technology

[0006] The details will be described later, but if the feedback control of the opening of the pressure regulator valve or the opening of the bypass valve is continued when the command value of the pressure at the branch point is lower than the lower limit of the pressure, it may not be possible to accurately carry out subsequent operations. feedback control

Images