Abstract: An arrangement structure for a fuel cell system in a vehicle including a fuel cell box which holds a fuel cell, a sub-frame which holds a fuel gas tank, and a fuel gas dilution box. The sub-frame is placed so as to be aligned with the fuel cell box, and the fuel gas dilution box is disposed between the fuel cell and the sub-frame.

Abstract: Hydrogen gas supplied to and then purged from a fuel cell is temporarily retained in a reservoir provided in an exhaust fuel diluter, and diluted before release into atmosphere. Cathode exhaust gas discharged from a cathode of the fuel cell is mixed to dilute the hydrogen gas, and air continues to be supplied to the cathode of the fuel cell for a specific period of time even after generation of electric power in the fuel cell is stopped, so that the hydrogen gas retained in the reservoir is continuously diluted with the cathode exhaust gas and released. Air for ventilation of the fuel cell may be used instead or in addition, to dilute and release the hydrogen gas retained in the reservoir after the generation of electric power in the fuel cell is stopped.

Abstract: An apparatus for dilution of discharged fuel of a fuel cell is provided, which has an inlet for guiding purged hydrogen gas coming from the fuel cell, a reservoir for storing the purged hydrogen gas guided through the inlet, and a cathode exhaust gas pipe penetrating the reservoir. The cathode exhaust gas pipe has a feature that it has holes inside the reservoir and is supplied with cathode exhaust gas of the fuel cell. Also the apparatus has a feature that the cathode exhaust gas pipe sucks the purged hydrogen gas stored in the reservoir through the holes and discharges the purged hydrogen gas diluted by mixing with the cathode exhaust gas.

Abstract: The ejector includes a diffuser, a nozzle, a needle, and a drive section. A throat portion and an increasing diameter portion are formed in a third conduit of the diffuser, and the nozzle and the needle are arranged coaxially with the third conduit. A first taper section of the needle is inserted into an aperture portion of the nozzle, and a second taper section is housed in the increasing diameter portion. A gap between the aperture portion and the first taper section constitutes a first fluid conduit, and a gap between the increasing diameter portion and the second taper section constitutes a second fluid conduit. The needle is provided so as to be shiftable in its axial direction by the drive section, and, by shifting the needle in its axial direction, it is possible to change both the first fluid conduit and the second fluid conduit simultaneously.

Abstract: A fuel supply device is provided capable of supplying a necessary amount of fuel while ensuring predetermined stoichiometric characteristics over a wide range of flow rates. The body unit of the fuel supply device includes the first ejector, the second ejector, and a switching valve. The switching valve has a function to select either one of a first passage or a second passage for communicating with the valve chamber and to block the other passage. The first passage is communicated with a nozzle of the first ejector, and the second passage is communicated with a nozzle of the second ejector. The first ejector has a diffuser passage communicated with the reflux chamber, the second ejector has a diffuser passage communicated with the reflux chamber, and the diffuser passage 43 and the diffuser passage are connected with a hydrogen outlet through a merging passage.

Abstract: A check valve is disposed in a hydrogen offgas circulation path which is connected to a fuel cell so as to flow the hydrogen offgas only in one direction. Inside a valve housing, a first compression chamber and a second compression chamber are provided such that a bulkhead is disposed therebetween. In the bulkhead 14, a first communication hole 18 and a second communication hole 19 are formed so as to communicate between the first compression chamber and the second compression chamber. In a first lead valve, an opening end is disposed upward and a fixed end is disposed downward. In a second lead valve, an opening end is disposed downward and a fixed end is disposed upward. By doing this, operability in the check valve after water has frozen can be improved.

Abstract: A discharged fuel diluter includes: a retention region with a predetermined volume, into which a fuel discharged from a fuel cell is retained at the time of purging; a dilution region with a predetermined volume, through which air discharged from the fuel cell flows and at which the air is mixed with the fuel from the retention region to dilute the fuel; and a communicating portion, through which the fuel flows from the retention region to the dilution region.

Abstract: A fuel supply device is provided capable of supplying a necessary amount of fuel while ensuring predetermined stoichiometric characteristics over a wide range of flow rates. The body unit of the fuel supply device includes the first ejector, the second ejector, and a switching valve. The switching valve has a function to select either one of a first passage or a second passage for communicating with the valve chamber and to block the other passage. The first passage is communicated with a nozzle of the first ejector, and the second passage is communicated with a nozzle of the second ejector. The first ejector has a diffuser passage communicated with the reflux chamber, the second ejector has a diffuser passage communicated with the reflux chamber, and the diffuser passage 43 and the diffuser passage are connected with a hydrogen outlet through a merging passage.

Abstract: The ejector includes a diffuser, a nozzle, a needle, and a drive section. A throat portion and an increasing diameter portion are formed in a third conduit of the diffuser, and the nozzle and the needle are arranged coaxially with the third conduit. A first taper section of the needle is inserted into an aperture portion of the nozzle, and a second taper section is housed in the increasing diameter portion. A gap between the aperture portion and the first taper section constitutes a first fluid conduit, and a gap between the increasing diameter portion and the second taper section constitutes a second fluid conduit. The needle is provided so as to be shiftable in its axial direction by the drive section, and, by shifting the needle in its axial direction, it is possible to change both the first fluid conduit and the second fluid conduit simultaneously.