Fuel cell system and method of controlling reaction condition of fuel in fuel cell

摘要

A target value of each of factors in a fuel cell system is determined based on a correspondence relationship of a change in each of the factors determining reaction conditions of fuel in a fuel cell to a change in an external environment of the fuel cell system, and peripheral devices of the fuel cell affecting the reaction conditions of the fuel in the fuel cell are controlled according to a target value of each of the factors.

主权项

1. A method of controlling reaction conditions of fuel in a fuel cell of a fuel cell system, the method comprising:
obtaining information regarding a current external environment of the fuel cell system; determining a target temperature of a surface of the fuel cell, the target temperature of the surface of the fuel cell varying corresponding to the obtained information, the determination of the target temperature of the surface of the fuel cell being based on a correspondence relationship of a change of the temperature of the surface of the fuel cell with respect to a change in an external environment of the fuel cell system; and controlling peripheral devices of the fuel cell that affect the reaction conditions of the fuel in the fuel cell according to the target temperature of the surface of the fuel cell, the controlling including adjusting a current concentration of the fuel whereby the current concentration of the fuel is increased or decreased, wherein the current concentration of the fuel is calculated from the difference between the target temperature of the surface of the fuel cell and a current temperature of the surface of the fuel cell by using the following Equation:C⁡(t)=Ci+K2⁡(K1⁢e⁡(t)+e⁡(t)-e⁡(t′)t-t′), wherein:
Ci is an initial concentration of the fuel at a point in time when the fuel cell system starts to operate,K1 and K2 are proportional constants,e(t) is the difference between the target temperature of the surface of the fuel cell and the current temperature at the current time t, ande(t′) is the difference between the target temperature of the surface of the fuel cell and the current temperature at a previous time t′.