Nissan Motor Company Limited

Mitsunori Kumada

Hayato Chikugo

Shinichi Makino

Ryoichi Shimoi

Yasushi Ichikawa

Yoshitomo Asai

Shinichi Miyazaki

Takahiro Fujii

Takashi Aoyama

Kenta Suzuki

Daigo Iwasaki

Ryouichi Shimoi

Takashi Fukuda

Tatsuya Yaguchi

Hiroshi Takeda

Kenichi Goto

Ryohey Toyota

Michihiko Matsumoto

Masashi Sato

Keigo Ikezoe

Ikuhiro Taniguchi

Kazuhiro Kageyama

Masatoshi Iio

Ken Nakayama

Hidetaka Nishimura

Yousuke Tomita

Naoto Todoroki

Hitoshi Igarashi

Takeshi Aso

Hisashi Niioka

Kenji Yonekura

Takatada Usami

Akira Matsunaga

Hideaki Setoguchi

Yoshinao Ootake

Naoto c/o Nissan Motor Co Ltd Todoroki

Ikuhiro c/o Nissan Motor Co Ltd Taniguchi

Hitoshi c/o Nissan Motor Co Ltd Igarashi

Yoshinao c/o Nissan Motor Co Ltd Ootake

A fuel cell system in which a fuel cell is coupled to a motor driving battery and a vehicular auxiliary machine is coupled to the motor driving battery via a first voltage converter, the fuel cell system including a fuel cell auxiliary machine coupled to the first voltage converter; and a second voltage converter that couples the fuel cell auxiliary machine to the fuel cell.

Fuel cell system

A fuel cell system includes a battery, a fuel cell configured to generate power in accordance with a load, an inverter configured to convert power output from the fuel cell into alternating-current power and supply the alternating-current power to a motor, and a converter configured to control voltage between the inverter and the fuel cell using power output from the battery. The fuel cell system includes a voltage control unit configured to control the converter such that the voltage between the inverter and the fuel cell does not fall below a voltage lower limit of the inverter, and a lower limit voltage control unit configured to, when power required by the motor increases, cause the voltage between the inverter and the fuel cell to fall below the voltage lower limit of the inverter.

Fuel cell system and control method for fuel cell system

A fuel cell vehicle control method changes an output current of a fuel cell depending on a required generated power and adjusts an air supply flow rate depending on the change of the output current. The output current is reduced in response to a decrease of the required generated power when a gearshift operation of a transmission is under an inertia phase of an upshift operation. The air supply flow rate is controlled to an inertia phase supply flow rate higher than the air supply flow rate set in response to the decrease of the output current.

Fuel cell vehicle control method and fuel cell vehicle control apparatus

A fuel cell equipped vehicle system in which an external power supply is coupled to an electric power supply line, the electric power supply line being coupled to a fuel cell, an electric power being input/output to/from a vehicular battery through the electric power supply line, the fuel cell equipped vehicle system performing an insulation test of the electric power supply line before charging the vehicular battery, the fuel cell equipped vehicle system including an insulation test unit configured to perform the insulation test of the electric power supply line; a switch that couples and cuts off between the fuel cell and the electric power supply line; and a control unit configured to control a coupling and a cutoff to/from the electric power supply line of the vehicular battery and control the switch, wherein the control unit is configured to cut off the vehicular battery from the electric power supply line and control the switch to cut off the fuel cell from the electric power supply line, and then drive the insulation test unit.

Fuel cell equipped vehicle system and control method for fuel cell equipped vehicle system

A control device for a vehicle includes a fuel cell, a motor-generator, a power unit, a transmission, a motor-generator control unit configured to perform a power control on the motor-generator based on a driver request torque, and a generated power control unit configured to control the generated power of the fuel cell based on a load of the fuel cell including the motor-generator. The motor-generator control unit performs a shifting power control for decreasing a rotation speed of the motor-generator during an upshift of the transmission, and a power control on the motor-generator based on a limit torque of the motor-generator during the shifting power control. The limit torque of the motor-generator being calculated based on an actual generated power of the fuel cell per unit time and an acceptable power of the power unit per unit time.

Control device and control method for vehicle

A fuel cell systemincludes: a fuel cellfor generating a power by causing an electrochemical reaction between an oxidant gas supplied to an oxidant electrodeand a fuel gas supplied to a fuel electrode; a fuel gas supplier HS for supplying the fuel gas to the fuel electrode; and a controllerfor controlling the fuel gas supplier HS to thereby supply the fuel gas to the fuel electrode, the controllerbeing configured to implement a pressure change when an outlet of the fuel electrodeside is closed, wherein based on a first pressure change pattern for implementing the pressure change at a first pressure width &#x394;P, the controllerperiodically changes a pressure of the fuel gas at the fuel electrode

Fuel cell system and method for controlling same

The fuel cell system of the present invention comprises: an electric motor, a fuel cell stack, a fuel supply unit, and a controller that controls a power-plant including the fuel cell stack and the fuel supply unit. The controller comprises further: a stack output-response request computing unit to compute a stack output-response request requested for the fuel cell stack; a stack voltage setup unit during idle-stop to set up a lower limit of stack setup-voltage during idle-stop that is set up as a stack voltage during execution of idle-stop so as to be higher as the stack output-response request is larger, and so as to be lower as the request is smaller; and an operation unit of recovering a stack voltage during idle-stop to execute a recovery operation when an actual stack voltage becomes, during execution of idle-stop, lower than the lower limit of stack setup-voltage during idle-stop.

Fuel cell system including controller to prevent over-discharge of battery and lowering in drivability upon recovering from idle stop

In a fuel cell system which executes a stop process of stopping an output from a fuel cell when a required power generation amount for the fuel cell is smaller than a predetermined power generation amount and supplies oxidant during a stop process period, fuel gas is intermittently supplied to a fuel electrode at a basic supply interval, which is set in advance and at which carbon dioxide is not generated in an oxidant electrode, during the stop process period.

Fuel cell system and control method of fuel cell system

In a fuel cell system that includes a fuel cell that generates power in response to an electrochemical reaction between hydrogen and oxygen contained in air, and a compressor that supplies air to the fuel cell, in which an idle stop is executed to stop power generation by the fuel cell when a required load falls to or below a predetermined value, and during the idle stop, air is supplied in accordance with a voltage condition between a cathode and a anode of the fuel cell, regardless of the required load, air is supplied during the idle stop while detecting an air supply amount, and when the air supply amount reaches a predetermined value, the air supply is stopped.

A fuel cell system includes, an oxidant feeder configured to supply an oxidant to a fuel cell, an oxidant passage which communicates with the fuel cell, a bypass passage which branches from the oxidant passage and along which part of the oxidant flows so as to bypass the fuel cell, a bypass valve which is provided in the bypass passage, an oxidant quantity-of-flow control unit which is configured to supply the quantity of flow of the oxidant corresponding to an amount of electricity required by the fuel cell, and an oxidant quantity-of-flow control unit for a sound vibration mode configured to supply a constant quantity of flow of the oxidant, and further includes a bypass valve control unit configured to control the bypass valve according to a requirement of the fuel cell when the oxidant quantity-of-flow control unit for the sound vibration mode controls the oxidant feeder.

Control device for fuel cell system

A fuel cell system includes a fuel cell, a control valve and a controller. The controller controls the control valve to periodically increase and decrease the anode gas pressure downstream of the control valve. The controller executes a shutdown/restart operation of the fuel cell by closing the control valve to stop the anode gas and shutting down power generation of the fuel cell upon receiving a shutdown command, and restarting feeding of the anode gas and restarting the power generation upon a prescribed operation restart condition being met. The controller estimates an anode gas concentration at a location where the anode gas concentration is locally lower within a power generation region of the fuel cell based on a control state of the anode gas when the shutdown command is issued. The controller sets the prescribed operation restart condition for executing the shutdown/restart operation based on the anode gas concentration.

Fuel cell device comprising a controller including an execution condition setting section

A fuel cell system includes a fuel cell, a control valve and a controller. The controller controls the control valve to periodically increase and decrease the anode gas pressure downstream of the control valve. The controller executes a shutdown operation of the fuel cell by closing the control valve to stop the anode gas and shutting down power generation of the fuel cell upon receiving a shutdown command. The controller estimates an anode gas concentration at a location where the anode gas concentration is locally lower within a power generation region of the fuel cell based on a control state of the anode gas at a time the shutdown command is issued. The controller determines whether to permit or prohibit shutting down the power generating operation based on the anode gas concentration.

A fuel cell stack includes a heat exchange unit that performs heat exchange between a gas mixture containing source hydrogen and a circulating gas and cooling water used for controlling the temperature of the fuel cell stack. A system controller adjusts the temperature of the cooling water by controlling a temperature control unit on the basis of the temperature of source hydrogen flowing into a junction at which the source hydrogen and a circulating gas are mixed such that the temperature of a source/recirculated hydrogen mixture that is mixed at the junction and that is supplied to the fuel cell stack is kept within a managed temperature range.

Fuel cell system and method of controlling fuel cell system

For implementing a stop control which extracts a current from a fuel cell and consumes a cathode side oxygen at a system stop, the current extraction from the fuel cell is ended in a state that a certain quantity of oxygen smaller than when the current extraction is started remains on a cathode side of the fuel cell. With this, the hydrogen movement to the cathode side after the system stop can be effectively suppressed and thereby a cathode internal hydrogen concentration at the system start can be kept low, thus making it possible to properly process the cathode side hydrogen at the system start.

Fuel cell system, and method of stopping fuel cell system

Deterioration at the start-up and deterioration during the leaving period are suppressed in a good balance. As a system shutdown process, a controller () causes consumption of the air (oxygen) present in an oxidant electrode of a fuel cell stack () (oxygen consumption control). Further, after the termination of the oxygen consumption control, the controller () performs control to set a medium pressure hydrogen valve () and a hydrogen pressure adjustment valve () in a closed state. The controller () thereby causes hydrogen to be held in a passage located between the medium pressure hydrogen valve () and the hydrogen pressure adjustment valve (). During a system shutdown period, a predetermined amount of hydrogen (medium pressure hydrogen) held in the hydrogen supply passage (L) at a position between the medium pressure hydrogen valve () and the hydrogen pressure adjustment valve () can be supplied to the fuel electrode of the fuel cell stack () through a bypass passage (L).

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Yokosuka, Japan

Mitsunori Kumada