Fuel cell system

Abstract

The fuel cell system includes a fuel cell stack, a fuel cell temperature sensor for measuring the internal temperature of the fuel cell, a voltage sensor for measuring the power generation voltage of the fuel cell, a current sensor for measuring the current flowing from the fuel cell, a radiator for radiating heat generated by the fuel cell, a fan attached to the radiator for controlling the heat radiation amount, a cooling water pump for increasing the pressure of a cooling fluid, a bypass valve for controlling the cooling fluid amount entering the radiator, and a controller, on the basis of the voltage information measured by the voltage sensor, the temperature information measured by the temperature sensor, and the current information measured by the current sensor, for controlling at least one of the operation amount of the cooling water pump, the operation amount of the fan, and the cooling fluid amount flowing through the bypass valve.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a drawing showing a part of the power generation system configuration of Embodiment 1 relating to the present invention,

FIG. 2 is a drawing showing a part of the power generation system configuration of Comparison Examples 1 and 2 relating to the present invention,

FIG. 3 is a drawing showing the power generation test results at start time of Embodiment 1 relating to the present invention,

FIG. 4 is a drawing showing the power generation test results at start time of Comparison Example 1 relating to the present invention, and

FIG. 5 is a drawing showing the power generation test results at start time of Comparison Example 2 relating to the present invention.

Claims

1. A fuel cell system comprising: a fuel cell stack;a fuel cell temperature sensor for measuring an internal temperature of said fuel cell;a voltage sensor for measuring a power generation voltage of said fuel cell;a current sensor for measuring a current flowing from said fuel cell;a radiator for radiating heat generated by said fuel cell;a fan attached to said radiator for controlling a heat radiation amount;a cooling water pump for increasing pressure of a cooling fluid;a bypass valve for controlling a cooling fluid amount entering said radiator; anda controller, on the basis of voltage information measured by said voltage sensor, temperature information measured by said temperature sensor, and current information measured by said current sensor, for controlling at least one of an operation amount of said cooling water pump, an operation amount of said fan, and a cooling fluid amount flowing through said bypass valve.

2. A fuel cell system comprising: a fuel cell stack formed by using a metallic material for separators;a fuel cell temperature sensor for measuring an internal temperature of said fuel cell stack;a voltage sensor for measuring a power generation voltage of said fuel cell;a current sensor for measuring a current flowing from said fuel cell;a radiator for radiating heat generated by said fuel cell;a fan attached to said radiator for controlling a heat radiation amount;a cooling water pump for increasing pressure of a cooling fluid;a bypass valve for controlling a cooling fluid amount entering said radiator;a cathode line having an arranged moistening device for adding water generated by power generation to air;an anode line for supplying hydrogen; anda controller for controlling an auxiliary device operation in said system; wherein:said controller judges on the basis of voltage information measured by said voltage sensor, temperature information measured by said temperature sensor, and current information measured by said current sensor, thereby controls at least one of an operation amount of said cooling water pump, an operation amount of said fan, and a cooling fluid amount flowing through said bypass valve.

3. The fuel cell system according to claim 1, wherein when: a displacement amount dV/dt of a fuel cell stack voltage V to time t is smaller than 0,a displacement amount dT/dt of a fuel cell stack temperature T to time t is larger than 0, and a displacement amount dI/dt of a fuel cell stack current I to time t is equal to or larger than 0,said controller changes at least one of said operation amount of said cooling water pump, said operation amount of said fan, and said cooling fluid amount flowing through said bypass valve and controls a quantity of heat discharged externally from said fuel cell so as to increase.

4. The fuel cell system according to claim 1, wherein when: a displacement amount dV/dt of a fuel cell stack voltage V to time t is smaller than 0,a displacement amount dT/dt of a fuel cell stack temperature T to time t is larger than 0, anda displacement amount dI/dt of a fuel cell stack current I to time t is equal to or larger than 0,said controller increases at least one of said operation amount of said cooling water pump, said operation amount of said fan, and a ratio of said cooling flow rate to said radiator to said cooling fluid amount flowing through said bypass valve.

5. The fuel cell system according to claim 1, wherein when: a displacement amount dV/dt of a fuel cell stack voltage V to time t is larger than 0 anda displacement amount dT/dt of a fuel cell stack temperature T to time t is smaller than 0,said controller changes at least one of said operation amount of said cooling water pump, said operation amount of said fan, and said cooling fluid amount flowing through said bypass valve and controls a quantity of heat discharged externally from said fuel cell so as to decrease.

6. The fuel cell system according to claim 1, wherein when: a displacement amount dV/dt of a fuel cell stack voltage V to time t is larger than 0 anda displacement amount dT/dt of a fuel cell stack temperature T to time t is smaller than 0,said controller decreases at least one of said operation amount of said cooling water pump, said operation amount of said fan, and a ratio of said cooling flow rate to said radiator to said cooling fluid amount flowing through said bypass valve.

7. The fuel cell system according to claim 1, wherein to a set value Tc of said stack temperature at time of rated power generation, when a present time T is within a range of T<Tc−5, an operation of a cooling section is driven repeatedly.