Fuel cell control program and fuel cell system

A fuel cell control program for having a computer perform the following procedures:

• (A) Procedure A of estimating, based on an operation condition φ(t) at a time t of a polymer electrolyte fuel cell containing, in an electrolyte membrane thereof, a radical generating ion and a radical scavenging ion, a concentration distribution Cg(z,t) of the radical generating ion and a concentration distribution Cs(z,t) of the radical scavenging ion (wherein z means a membrane-thickness direction position in the electrolyte membrane) in the electrolyte membrane and storing the concentration distributions in a memory,
• (B) Procedure B of acquiring a load command p(t+Δt) at a time (t+Δt) and storing the load command in the memory,
• (C) Procedure C of acquiring a reference operation condition φref(t+Δt) under which the load command p(t+Δt) can be realized and storing the reference operation condition in the memory,
• (D) Procedure D of judging whether or not a judgment index f1(Cg(z,t), Cs(z,t)) including the Cg(z,t) and/or the Cs(z,t) exceeds a first threshold value ϵ1 (or is ϵ1 or more), and
• (E) Procedure E of selecting, as the φ(t+Δt), an operation condition which is different from the φref(t+Δt) and under which the f1(Cg(z,t), Cs(z,t)) is not more than the ϵ1 (or is less than the ϵ1) when the f1(Cg(z,t), Cs(z,t)) is judged to exceed the ϵ1 (or is judged to be the ϵ1 or more) in the Procedure D and
• selecting, as the φ(t+Δt), the φref(t+Δt) when the f1(Cg(z,t), Cs(z,t)) is judged not to exceed the ϵ1 (or is judged not to be the ϵ1 or more) in the Procedure D.