Abstract: A fuel cell system includes a controller that controls actions of the fuel cell system. The controller includes a freezing presence-absence determination unit that performs freezing presence-absence determination, a temperature raising execution unit that performs temperature raising processing for raising a temperature of an exhaust and drain valve, and a thawing presence-absence determination unit. In the freezing presence-absence determination, freezing determination is made when the exhaust flow rate of gas is equal to or lower than a first threshold. In the thawing presence-absence determination, thawing determination indicating that the exhaust and drain valve is thawed is made when the exhaust flow rate of gas is higher than a second threshold. The second threshold shows a flow rate higher than the first threshold.

Abstract: A fuel cell system includes a fuel cell, an anode gas supply system, an anode gas circulatory system, a cathode gas supply-discharge system, a gas-liquid discharge passage, a gas-liquid discharge valve configured to open and close the gas-liquid discharge passage, a flow-rate acquisition portion, and a controlling portion. After the controlling portion instructs the gas-liquid discharge valve to be opened, the controlling portion executes a normal-abnormality determination such that, when a discharge-gas flow rate of anode gas is a predetermined normal reference value or more, the controlling portion determines that the gas-liquid discharge valve is opened normally, and when the discharge-gas flow rate is lower than the normal reference value, the controlling portion determines that the gas-liquid discharge valve is not opened normally.

Abstract: A fuel cell vehicle comprises a fuel cell, a power storage device, a drive motor, a temperature sensor configured to measure a temperature of the fuel cell, a detector configured to detect an operation condition of the fuel cell, and a controller. At a start time of the fuel cell, in a case where the temperature of the fuel cell detected by the temperature sensor is below a freezing point, when an output condition of the fuel cell shown by the detected operation condition of the fuel cell continuously corresponds to a predetermined low output condition for a predetermined reference time period or longer, the controller sets a driving state of the fuel cell vehicle to a first driving state that stops power generation of the fuel cell, drives the drive motor by using only the power storage device as a power source and limits a motor output of the drive motor to be equal to or lower than a predetermined first upper limit output.

Abstract: A fuel cell system comprises a fuel cell, a gas-liquid separator, a drain flow path through which moisture is discharged from the gas-liquid separator, a valve configured to control discharge of the moisture from the gas-liquid separator, and a controller configured to control fuel cell operation and opening and closing of the valve, and determine whether the valve is frozen. Upon receipt of a stop request of the fuel cell during the fuel cell operation, the controller repeatedly determines whether the valve is frozen. If the controller determines that the valve is frozen, it continues the fuel cell operation until it determines that the valve is not frozen. If the controller determines that the valve is not frozen, it executes stop processing of the fuel cell including opening valve processing.

Abstract: When a time period from a stop to a start of a fuel cell system exceeds a predetermined time period, a controller of the fuel cell system obtains a first electrical conductivity of a cooling medium that is placed from a radiator to before a connecting location of one end portion in a cooling medium circulation flow path and a second electrical conductivity of the cooling medium that is placed on a downstream side of an ion exchanger in a bypass flow path, and uses the obtained first electrical conductivity and second electrical conductivity and a predetermined target electrical conductivity of a supply cooling medium to control the operation of a flow dividing valve such that the electrical conductivity of the supply cooling medium becomes equal to or less than the target electrical conductivity and thereby regulate a flow rate ratio.

Abstract: An FC (fuel cell) system includes: an FC; a radiator configured to cool a CL (cooling liquid); an ion exchanger provided in a BFP (bypass flow path) branched off from a CFP (circulation flow path) for allowing the CL to circulate between the FC and the radiator; a multi-way valve provided in a branching point at which the BFP is branched off from the CFP; and a pump which circulates the CL. A percentage of the CL that is made to flow through the BFP can be controlled by the multi-way valve. In a case in which a stop time is longer than a threshold time when the FC system is started up, after the CL is circulated through the radiator, the CL is circulated through the BFP at the percentage of 80% or more until electrical conductivity of the CL becomes smaller than a threshold electrical conductivity.

Abstract: There is provided a fuel cell system comprising a controller configured to control an opening position of a valve element of a flow dividing valve. The valve element is configured to be movable between a first position and a second position, according to the number of steps of a stepping motor that is provided to drive the valve element. When causing a fuel cell to perform power generation, the controller moves the valve element by a first number of steps such as to move from the first position to the second position and to additionally move the valve element toward the second position, based on a second number of steps that are taken from a time when the valve element starts moving from the first position toward the second position to a time when a voltage measured by a voltage sensor exceeds a predetermined value.

Abstract: When the fuel cell stack is operated in a state in which the air stoichiometric ratio is smaller than the predetermined value, the controller calculates the amount of retained water that has been retained in the cathode flow path of the fuel battery cell per fixed time in such a way that the calculated amount includes an extra amount therein, integrates the amount of retained water per fixed time that has been calculated in such a way that the calculated amount includes the extra amount therein, and executes air blow in the cathode flow path of the fuel battery cell when the integrated value of the amount of retained water becomes equal to or larger than the threshold.

Abstract: A control unit of a fuel cell system acquires a service operating point, repeats a process of calculating a distance between the service operating point and a surging region, while transferring an operating point of a turbo compressor from a first operating point to a second operating point outside the surging region, sets opening degrees of a pressure adjusting valve and a bypass valve such that the turbo compressor operates at a required operating point, when the distance exceeds a threshold, and corrects at least one of the opening degrees of the pressure adjusting valve and the bypass valve such that the at least one of the opening degrees becomes larger than an opening degree set such that the turbo compressor operates at the required operating point, when the distance is equal to or shorter than the threshold.

Abstract: A fuel cell system includes a fuel cell stack, a compressor that supplies cathode gas to the fuel cell stack, and a controller that controls constituent components of the fuel cell system including the compressor. The controller controls the compressor, such that a supply period in which the compressor supplies the cathode gas and a stop period in which supply of the cathode gas is stopped appear alternately, when the fuel cell stack is not required to generate electric power, and the supply period is longer than the stop period, and such that the flow rate of the cathode gas supplied by the compressor in the supply period is smaller than the flow rate in the case where the fuel cell stack is required to generate electric power.

Abstract: A controller of a fuel cell system performs cathode gas supply control to raise an average cell voltage of a fuel cell stack by increasing supply of cathode gas to the fuel cell stack, when electric power required to be generated by the fuel cell stack is equal to zero, and the average cell voltage is lower than a predetermined target voltage. Under the cathode gas supply control, the controller sets the target voltage when a predetermined condition indicating that crossleak is likely to occur is satisfied, to a value higher than a reference target voltage as the target voltage in the case where the condition is not satisfied.

Abstract: A refrigeration device includes a refrigerant circuit sequentially connecting a compressor, a condenser, a reservoir, and a subcooling coil via refrigerant pipes in series, an injection circuit configured to inject part of refrigerant flowing from the condenser to an intermediate pressure part of the compressor, and an injection expansion valve configured to reduce a pressure of refrigerant branched on a downstream side of the subcooling coil. The refrigeration device includes a temperature measurement unit, a pressure measurement unit, and a controller configured to identify a type of refrigerant on the basis of a measured value of the temperature measurement unit and a measured value of the pressure measurement unit, and control at least one of an operating frequency of the compressor, a rotation frequency of a condenser fan, and an opening degree of the injection expansion valve.

Abstract: A refrigeration cycle apparatus includes: a low-stage refrigeration cycle including a low-stage compressor, a low-stage condenser, a low-stage pressure reducing device, and a low-stage evaporator, and circulating low-stage refrigerant; a high-stage refrigeration cycle including a high-stage compressor, a high-stage condenser, a high-stage pressure reducing device, and a high-stage evaporator, and circulating high-stage refrigerant; a cascade condenser exchanging heat between the low-stage refrigerant in the low-stage condenser and the high-stage refrigerant in the high-stage evaporator, and a controller. The low-stage refrigerant is a refrigerant that undergoes disproportionation. The low-stage refrigerant is maintained at a pressure lower than a disproportionation pressure at which the low-stage refrigerant undergoes disproportionation.

Abstract: A refrigerating apparatus includes a high-temperature side circuit and a low-temperature side circuit connected to each other via a cascade condenser, a low-temperature side second flow control valve that turns a refrigerant, passing through a liquid pipe connecting between a cooling unit and other circuit parts in a low-temperature side circuit b, into a gas-liquid two-phase refrigerant, and an expansion tank connected to the suction side of a low-temperature circuit compressor via a tank electromagnetic valve.

Abstract: In a fuel cell system, after a controller performs stop process of stopping power generation by a fuel cell, the controller performs hydrogen supply process n times (n is a natural number of one or more) if a residual hydrogen estimated amount showing an estimated amount of hydrogen remaining in an anode side of the fuel cell is smaller than a threshold. The hydrogen supply process is to supply hydrogen of a first supply amount responsive to a difference between the threshold and the residual hydrogen estimated amount. If a cathode potential acquired in the hydrogen supply process performed for an n-th time satisfies a correction condition, the controller corrects the residual hydrogen estimated amount by reducing the residual hydrogen estimated amount before supply of hydrogen in the n-th hydrogen supply process.

Abstract: There is provided a fuel cell system. The fuel cell system comprises a fuel cell configured to generate electric power using a reactive gas; a compressor configured to compress the reactive gas and feed the compressed reactive gas to the fuel cell; a flow rate measurement unit configured to measure a flow rate of the reactive gas; a pressure measurement unit configured to measure a pressure of the compressed reactive gas; a power value acquirer configured to acquire a value of electric power consumed by the compressor; and a determiner configured to perform determination with regard to an abnormality of the fuel cell system and to provide an output indicating that an abnormality occurs.

Abstract: A refrigerating apparatus includes a high-temperature side circuit and a low-temperature side circuit connected to each other via a cascade condenser, a low-temperature side second flow control valve that turns a refrigerant, passing through a liquid pipe connecting between a cooling unit and other circuit parts in a low-temperature side circuit b, into a gas-liquid two-phase refrigerant, and an expansion tank connected to the suction side of a low-temperature circuit compressor via a tank electromagnetic valve.

Abstract: There is provided a fuel cell system comprising a fuel cell including an electrolyte membrane, an anode and a cathode; and a controller configured to control a fuel gas supply part and an oxidizing gas supply part to supply amounts of a fuel gas and an oxidizing gas corresponding to a required power, to the fuel cell. During an intermittent operation that has the required power equal to or lower than a predetermined value and stops power generation in the fuel cell, the controller estimates a crossover amount that is an amount of the fuel gas moved from the anode to the cathode through the electrolyte membrane. The controller also calculates a supply amount of the oxidizing gas that is an amount of the oxidizing gas to be supplied to the fuel cell, based on the estimated crossover amount and controls the oxidizing gas supply part to supply the calculated supply amount of the oxidizing gas to the fuel cell.

Abstract: The refrigeration cycle apparatus includes: liquid-side connection piping that extends from liquid-side refrigerant piping; gas-side connection piping that extends from gas-side refrigerant piping; a refrigerant storage tank that stores refrigerant, an intake side thereof being connected to the liquid-side connection piping, and a discharge side thereof being connected to the gas-side connection piping; an inlet-side electromagnetic valve that is disposed on the liquid-side connection piping, and that is opened when there is no passage of electric current; an inlet-side check valve that is disposed on the liquid-side connection piping, and that allows the refrigerant to flow only toward the refrigerant storage tank; and a valve apparatus that is disposed on the gas-side connection piping, that is opened during passage of electric current to the inlet-side electromagnetic valve, and that is delayed before being shut off after passage of electric current to the inlet-side electromagnetic valve is stopped.

Abstract: A two-stage refrigeration apparatus includes a high-stage refrigeration cycle including a high-stage-side refrigerant circuit including a high-stage-side compressor, high-stage-side condenser, high-stage-side expansion valve, and high-stage-side evaporator connected by pipes, a low-stage refrigeration cycle including a low-stage-side refrigerant circuit including a low-stage-side compressor, low-stage-side condenser, low-stage-side receiver, low-stage-side expansion valve, and low-stage-side evaporator connected by pipes, a cascade condenser including the high-stage-side evaporator and low-stage-side condenser, a receiver heat exchanging portion configured to cool the low-stage-side receiver, and a high-stage refrigeration cycle controller configured to perform controlling so as to activate the high-stage-side compressor when estimating a low-stage-side refrigerant will reach a supercritical state while the low-stage-side compressor is defrosted on the basis of the pressure of the low-stage-side refrigerant.