Honda Motor Co., Ltd.

Takuya Tamura

Naoki Yamano

Manabu Iwaida

Kuniaki Ojima

Shinya Watanabe

Koji Moriyama

Nobumasa Toyoshima

In a case where each of the temperature, the impedance, and the output current of a fuel cell stack falls within a predetermined range, the output voltage of the fuel cell stack is measured, and the measured output voltage is compared with a reference value to thereby determine the degree of degradation of the fuel cell stack.

Method of determining degradation of fuel cell stack, and fuel cell vehicle equipped with the fuel cell stack

An operating method of a fuel cell system which includes a plurality of fuel cell stacks; a refrigerant passage configured to circulate a refrigerant circulated in a first fuel cell stack among the plurality of fuel cell stacks through a second fuel cell stack among the plurality of fuel cell stacks; and a first temperature acquisition unit and second temperature acquisition unit configured to acquire a temperature of the refrigerant downstream of the first fuel cell stack and upstream of the second fuel cell stack, includes, when the temperature of the refrigerant acquired by the first temperature acquisition unit and the second temperature acquisition unit is equal to or lower than a predetermined temperature, after start of the first fuel cell stack and after elapse of a delay time, starting the second fuel cell stack, and variably setting the delay time according to the temperature of the refrigerant.

Operating method of fuel cell system

According to an embodiment, a control system includes a fuel cell configured to generate electric power using an anode and a cathode, a power storage device capable of storing the electric power generated by the fuel cell, auxiliary equipment to which the electric power is able to be supplied, and a controller configured to control operations of the fuel cell and the auxiliary equipment. The controller performs control so that the electric power is consumed by the auxiliary equipment in accordance with a power storage state of the power storage device at the time of power generation of the fuel cell and adjusts one or both of a timing and a degree at which electric power to be consumed by the auxiliary equipment is limited on the basis of temperature information associated with the auxiliary equipment.

Control system, moving body, and control method

A method of operating a fuel cell system which has a plurality of fuel cell stacks, and includes a first refrigerant passage, a second refrigerant passage, a first temperature acquisition unit, a second temperature acquisition unit, a first refrigerant circulation passage, a first refrigerant pumping unit, a first heat exchanger and a first flow rate adjusting valve includes: after the plurality of fuel cell stacks are stopped, until a predetermined condition is satisfied, driving the first refrigerant pumping unit; and causing the first flow rate adjusting valve to adjust the flow rate of the refrigerant flowing through the first refrigerant passage and the flow rate of the refrigerant flowing through the second refrigerant passage, on the basis of the temperature of the refrigerant flowing through each of the first refrigerant passage and the second refrigerant passage acquired by the first temperature acquisition unit and the second temperature acquisition unit.

A fuel cell system includes a first ion exchanger, a first fuel cell stack and a second fuel cell stack, a first temperature acquisition part and a second temperature acquisition part, a first power generation time acquisition part and a second power generation time acquisition part, a supply path, an ion concentration estimation part that estimates ion concentration of a refrigerant on the basis of the ion concentration estimated by the ion concentration estimation part, a determination part that determines an exchange timing of the first ion exchanger on the basis of the ion concentration estimated by the ion concentration estimation part, and a control part, and a first refrigerant flow path and a second refrigerant flow path are provided in series or in parallel.

Fuel cell system

A fuel cell system includes a first temperature sensor to detect a valve temperature of a sealing valve. A second temperature sensor is provided in a refrigerant circulation circuit to detect a fuel cell temperature of a fuel cell through a refrigerant. The circuitry is configured to calculate a sealing valve estimated temperature by subtracting a correction value from the fuel cell temperature detected by the second temperature sensor after the fuel cell stops generating electric power and after the sealing valve is closed. The circuitry is configured to determine whether at least one of the valve temperature and the sealing valve estimated temperature is lower than a predicted freezing temperature. The circuitry is configured to open the sealing valve when it is determined that the at least one of the valve temperature and the sealing valve estimated temperature is lower than the predicted freezing temperature.

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Wako, Japan

Takuya Tamura