Catalyst deterioration suppression device

A catalyst deterioration suppression device comprising:

• first means for obtaining a voltage V (= catalyst voltage Vcat) of a fuel cell as a variable to estimate a response speed (time constant τ) at which a coverage ratio of an oxide film of catalyst particles contained in a cathode of the fuel cell changes;
• second means for reading out a time constant τt corresponding to the voltage V at a current time t from a pre-made map A representing a relationship between the voltage V and the time constant τ and corresponding to the catalyst particles;
• third means for generating a continuous-time type dynamic filter F(s, τ) by using the time constant τt, converting the continuous-time type dynamic filter F(s, τ) to a discrete-time type dynamic filter F(z, τ), and mounting the discrete-time type dynamic filter on an in-vehicle controller provided in a vehicle;
• and
• fourth means for inputting a target voltage Vr to the discrete-time type dynamic filter F(z, τ) and outputting a corrected target voltage Vr-fil to an actuator controller provided in the vehicle.