As a freezing judgment mechanism, comprised in a gas-liquid separator are electrodes and, an iron core, a magnetic absorption substance located within the water, and guides and for controlling the operation of the magnetic absorption substance. The control unit applies a voltage to the electrodes, c
As a freezing judgment mechanism, comprised in a gas-liquid separator are electrodes and, an iron core, a magnetic absorption substance located within the water, and guides and for controlling the operation of the magnetic absorption substance. The control unit applies a voltage to the electrodes, changing the iron core to an electromagnet by the magnetic field generated between the electrodes. When not frozen, the electromagnet and the magnetic absorption substance are pulled together, the contact points A and B close, and a conductive state is achieved. When frozen, even if the electromagnet and the magnetic absorption substance are pulled together, ice exists between the two items, so it is difficult for the magnetic absorption substance to float upward. After voltage is applied to the electrodes, the control unit judges the water Wa within the gas-liquid separator to be frozen when a conductive state is not detected even after a specified time has elapsed.
대표청구항▼
The invention claimed is: 1. A fuel cell system comprising: a fuel cell; a gas supply pipe that supplies gas used for generating electricity to the fuel cell; a gas discharge pipe that discharges gas discharged from the fuel cell, a gas-liquid separator located in at least part of the gas discharge
The invention claimed is: 1. A fuel cell system comprising: a fuel cell; a gas supply pipe that supplies gas used for generating electricity to the fuel cell; a gas discharge pipe that discharges gas discharged from the fuel cell, a gas-liquid separator located in at least part of the gas discharge pipe and the gas supply pipe, for collecting water in the discharged gas; and a freezing judgment device that performs a freezing judgment of the water collected within the gas-liquid separator based on differences in volume of the water collected within the gas-liquid separator when frozen and when not frozen, wherein a detecting section of the freezing judgment device is provided in the gas-liquid separator the freezing judgment device comprises an elastic member that changes shape with pressure and is provided at any part under the water surface within the gas-liquid separator, wherein the freezing judgment device performs the freezing judgment based on a shape change state of the elastic member and wherein the freezing judgment is performed during activation of the fuel cell system, and the fuel cell system comprises a system activation prohibition module that prohibits activation of the fuel cell system when freezing of the water is detected. 2. A fuel cell system recited in claim 1, wherein the gas supply pipe includes a fuel gas supply pipe for supplying fuel gas to the fuel cell, the gas discharge pipe includes an anode off gas discharge pipe for discharging the anode off gas from the fuel cell, the gas-liquid separator is located above the anode off gas discharge pipe, the fuel cell system further comprising: linked bypass piping that branches from the anode off gas discharge pipe and which is continuous under the water surface within the gas-liquid separator; a switching device that switches the fuel gas path to either the anode off gas discharge pipe or the linked bypass piping; and a pressure measuring device that measures the pressure of the anode off gas discharge pipe, wherein the freezing judgment device judges freezing based on the pressure value measured by the pressure measuring device in a state with the path switched to the linked bypass piping side. 3. A fuel cell system recited in claim 1, wherein the freezing judgment device judges the freezing of the water collected within the gas-liquid separator based on a difference in a volume of the water within the gas-liquid separator when frozen and when not frozen. 4. A fuel cell system recited in claim 3, further comprising a pressure measuring device that measures pressure at a part lower than a water surface within the gas-liquid separator, wherein the freezing judgment device judges the freezing of the water collected within the gas-liquid separator based on the pressure measured. 5. A fuel cell system recited in claim 3, further comprising an elastic member that changes shape with pressure and is provided at any part under a water surface within the gas-liquid separator, wherein the freezing judgment device judges freezing based on the shape change state of the elastic member. 6. A fuel cell system recited in claim 5, wherein the gas-liquid separator has a side surface and a bottom surface, and the elastic member is located near the bottom surface at the side surface within the gas-liquid separator. 7. A fuel cell system recited in claim 1, further comprising a pressure measuring device that measures a pressure at a part lower than a water surface within the gas-liquid separator. 8. A fuel cell system recited in claim 1, wherein the gas-liquid separator has a side surface and a bottom surface, and the elastic member is located near a bottom surface at a side surface within the gas-liquid separator.
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이 특허에 인용된 특허 (5)
Wheat, William S.; Meltser, Mark A.; Masten, David A., Fuel cell energy management system for cold environments.
Fujita,Nobuo; Horio,Kimihide; Matsumoto,Tadaichi; Yoshida,Naohiro; Kurita,Kenji; Sakaguchi,Shinya; Mori,Hiroaki, Fuel cell system and method of controlling the same fuel cell system.
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