Abstract: Provided is a vehicle skid control device that avoids a skid erroneous judgment in a high revolution range of a motor. The vehicle skid control device detects the number of revolutions of the motor. When the number of revolutions of the motor is equal to or larger than a predetermined threshold value Nm, the vehicle skid control device prohibits a skid judgment. When the number of revolutions of the motor is smaller than the predetermined threshold value Nm, the vehicle skid control device permits the skid judgment. When the number of revolutions of the motor is equal to or larger than the threshold value Nm, the skid judgment is prohibited. Accordingly, it is possible to avoid the skid erroneous judgment in the high revolution range with the number of revolutions equal to or larger than Nm.

Abstract: In the present invention, after the initial setting of the FC entry target pressure, the FC entry target pressure is maintained at this initial-setting value until the concentration of impurities in the gas supplied to the anode in the fuel cell falls below a certain value. This initial-setting value is set to a pressure higher than the FC entry target pressure set in response to the FC electric current during normal power generation. If the concentration of impurities in the gas supplied to the anode in the fuel cell has fallen below the certain value, then the FC entry target pressure is sought using a map showing the relationship between the FC electric current detected in step S5 and the entry target pressure set in response to the output required for the fuel cell.

Abstract: A fuel cell system capable of providing a suitable power distribution is provided. A fuel cell system includes: a fuel cell that generates electric power through an electrochemical reaction between a fuel gas and an oxidant gas; a motor that can be driven upon the supply of electric power and can generate regenerative power; a power storage unit which can be charged with power generated from the fuel cell and regenerative power of the motor and can discharge charge power to the motor; an auxiliary apparatus used for operating at least the fuel cell; and a control unit that controls a power distribution between the above components.

Abstract: There is provided a fuel cell system capable of suppressing the increase of a control error of a motor. The system includes a fuel cell which generates a power by an electrochemical reaction between a fuel gas and an oxidizing gas, a motor driven by the generated power of the fuel cell, and a control unit which controls the generation state of the fuel cell. The control unit performs high-potential avoiding control to prevent the total voltage of the fuel cell from exceeding a predetermined high-potential avoiding voltage threshold value. In a vehicle velocity region where the control switching of the traction motor is caused, the high-potential avoiding volume is inhibited.

Abstract: A fuel cell system for a vehicle, controlling a power generation amount of a fuel cell. A required power generation amount of the fuel cell and a target operational state corresponding to required power generation amount are calculated. An operational state of the fuel cell is detected. A correction power generation amount used for correcting the required power generation amount and an allowable power generation amount that the fuel cell can stably generate based on the operational state of the fuel cell are also calculated. Further, an output power generation amount of the fuel cell is determined based on a relation between the allowable power generation amount and the power generation amount obtained by correcting the required power generation amount by the correction power generation amount.

Abstract: A fuel cell system is provided which can accurately detect an insulation resistance even during a high-potential prevention control. The fuel cell system includes: a fuel cell that generates electric power through an electrochemical reaction between a fuel gas and an oxidant gas; an insulation resistance measurement unit that measures an insulation resistance between the fuel cell and an outer conductor; and a control unit that controls a power generation state of the fuel cell, and the control unit carries out a high-potential prevention control that avoids a voltage of the fuel cell becoming equal to or higher than a predetermined high-potential prevention voltage threshold lower than an open circuit voltage of the fuel cell, and changes the high-potential prevention voltage threshold during an insulation resistance detection performed by the insulation resistance measurement unit.

Abstract: Provided is a fuel cell system that can change the number of active phases in a DC/DC converter in order to prevent overcurrent from flowing through one point (e.g., a reactor of the DC/DC converter) in the system. In step S1, whether or not the system is in a state that causes a rapid change in a voltage command value is checked. If the system is in a state that causes a rapid change in the voltage command value, the processing goes to step S2, and if not, the processing goes to step S3. In step S2, a DC/DC converter is prohibited from being driven in a single phase and the processing ends. In step S3, the DC/DC converter is permitted to be driven in a single phase and the processing ends.

Abstract: When a request power for a fuel cell is smaller than a predetermined value, a fuel cell system stops the supply of an oxidizing gas to the fuel cell and lowers the output voltage of the fuel cell from a use upper limit voltage to a reduction voltage to perform catalyst activation processing. When the output voltage of the fuel cell lowers to an air blow voltage because of the shortage of the oxidizing gas, the fuel cell system resupplies the oxidizing gas to recover the output voltage of the fuel cell.

Abstract: An output of a fuel cell is appropriately controlled. A required electric power generation amount calculation unit calculates and adds: an amount of electric power to be supplied to a traction motor; an amount of electric power to be supplied to an auxiliary apparatus; and an amount of electric power to be supplied to a battery and the traction motor in accordance with the charging and discharging of the battery, to calculate a required electric power generation amount. A lost electric power amount calculation unit calculates a lost electric power amount with reference to a lost electric power amount map based on: the required electric power generation amount; and a voltage increase ratio, output voltage and temperature in an FC converter. A lost electric power amount addition unit corrects the required electric power generation amount by adding the lost electric power amount to the required electric power generation amount.

Abstract: A fuel cell system including a fuel cell, and a converter which is connected between the fuel cell and a high voltage system and which sets an output ceiling voltage of the fuel cell, the fuel cell system comprising fuel gas supply stopping means for stopping the supply of fuel gas to the fuel cell in an intermittent operation mode, remaining fuel gas amount determination means for determining whether fuel gas in at least an amount capable of generating power remains in the fuel cell, converter driving means for driving the converter so that, when it is determined that fuel gas in at least the amount capable of generating power remains in the fuel cell, the output ceiling voltage of the fuel cell becomes a first voltage capable of preventing deterioration of the fuel cell, and converter stopping means for stopping the converter when it is determined that fuel gas in at least the amount capable of generating power does not remain in the fuel cell.

Abstract: Provided are a fuel cell system and a control method thereof capable of inhibiting the occurrence of problems caused by surplus electrical power even in cases where the torque able to be generated by the motor is limited due to a low motor drive voltage. A fuel cell system provided with a fuel cell and a motor is further provided with required output torque calculation means for calculating a required output torque based on an output requirement, torque upper limit value calculation means for calculating a torque upper limit value of torque able to be generated by the motor based on a drive voltage of the motor, required motor torque calculation means for calculating a required motor torque based on the required output torque and the torque upper limit value, required motor power calculation means for calculating a required motor power-based on the required motor torque, and required generated power calculation means forcalculating a required generated power of the fuel cell based on the required motor power.

Abstract: An alert method capable of preventing problems due to excessive lowering of a remaining fuel amount of a fuel cell system is provided. The alert method includes the following steps of: switching over operation/stopped states of the fuel cell system, detecting that the state of the fuel cell system is switched over to a stopped side, and communicating information related to the remaining fuel amount to a user when fuel of the fuel cell system is consumed in a state where the switch is switched over to a stopped side. According to the alert method, information related to the remaining fuel amount is communicated to the user when fuel is consumed by the fuel cell system while in a practically stopped state. Therefore, it is possible to prevent excessive lowering of the remaining fuel amount of the fuel cell system.

Abstract: A system voltage indicated by an intersection of a graph of an FC maximum output characteristic of the output voltage/output power characteristic of a fuel cell and a graph of a load device maximum output characteristic is output so as to obtain optimal output power, thereby matching an output current-output voltage characteristic of a fuel cell and a maximum output characteristic of a load. Thus, a fuel cell system which has high operating efficiency and which is free of physical failures is provided.

Abstract: There are provided a fuel cell system capable of reducing power consumption by inhibiting an unnecessary operation of a DC-DC converter, and a power control method therefor.

Abstract: A gas level display controller includes a mass computation module, a reference value setting module, and a display control module. The mass computation module obtains a pressure and a temperature of compressed hydrogen stored in a hydrogen tank and calculates a mass of the compressed hydrogen in the hydrogen tank, for example, according to a known gas state equation. The reference value setting module sets a reference value, which is used for display of a remaining amount of the compressed hydrogen in the hydrogen tank on a display device, to the mass of the compressed hydrogen calculated by the mass computation module on the occasion of filling the compressed hydrogen into the hydrogen tank to limitation of the hydrogen filling. The display control module calculates a ratio of the mass of the compressed hydrogen to the reference value and makes the remaining amount of the compressed hydrogen in the hydrogen tank displayed on the display device, based on the calculated ratio.

Abstract: A fuel cell system FCS includes a fuel cell FC, a motor ES4 connected to the fuel cell FC, an FC boost converter ES6 which raises the output voltage of the fuel cell FC to output the voltage to the motor ES4, an inverter ES3, a current sensor S2, and a controller EC which controls the fuel cell FC, the FC boost converter ES6 and the inverter ES3. The controller EC controls the inverter ES3 so as to raise the target output voltage of the inverter, when the current detected by the current sensor S2 exceeds a predetermined current threshold value.

Abstract: A fuel cell system that includes a fuel cell that generates electricity through an electrochemical reaction between a fuel gas and an oxidant gas, and a control portion that determines whether there is leakage of the fuel gas. The control portion has start means for starting the fuel cell by raising the voltage of the fuel cell from a starting voltage to an operation voltage that is lower than an open-circuit voltage, and leakage determination means for determining whether there is leakage of the fuel gas before the voltage of the fuel cell reaches the operation voltage when the fuel cell is started.

Abstract: When an output voltage of a fuel cell is lowered to carry out a catalyst activation process so as to activate a catalyst during an intermittent operation of the fuel cell, if generated power P1 exceeds allowed battery charge power, while generated power P2 does not exceed the allowed battery charge power, then low speed corresponding to the generated power P2 is selected and the output voltage of the fuel cell is decreased toward a target voltage on the basis of the low speed, which has been selected, thereby restraining sudden generation of surplus power caused by a reduction in the output voltage of the fuel cell. By the control described above, a voltage reduction speed of a fuel cell is determined according to a receiving capability of an object which receives surplus power generated by the fuel cell during the catalyst activation process of the fuel cell.

Abstract: In a mobile body, an intermittent operation to temporarily halt a cell operation is performed at a time when a request for power generation with respect to a fuel cell stack is less than a predetermined value, and recovery processing of a cell voltage is performed at a time when a cell voltage recovery processing executing condition is satisfied during the intermittent operation. When the mobile body is moving, a threshold voltage Vth1 is set as the cell voltage recovery processing executing condition. When the mobile body is stopped, a threshold voltage Vth2 is set as the cell voltage recovery processing executing condition. When the voltages are set so as to obtain a relation Vth1>Vth2, the cell voltage recovery processing can be limited during the stop of the mobile body.

Abstract: A motor can be driven while reducing the power loss of the entire system where a plurality of devices that causes power losses exists. The system is provided with an inverter connected to a motor, a first converter that is connected between a fuel cell and the inverter and sets an output voltage of the fuel cell, a second converter that is connected between a power storage device and the inverter and sets an input voltage Vin of the inverter, and a controller that controls the first converter and the second converter. Under the operating condition (torque, number of revolutions) required for the motor, an input voltage of the inverter which minimizes a power loss of at least one of the motor, the first converter, the second converter and the inverter is determined, and the determined input voltage is output as a necessary voltage for the inverter.