Nissan Motor Company Limited

Yousuke Tomita

Hayato Chikugo

Keigo Ikezoe

Kenichi Goto

Masashi Sato

Tetsuya Aoki

Mitsunori Kumada

Yoshitomo Asai

Yasushi Ichikawa

Ken Nakayama

Fumio Kagami

A fuel cell system includes an anode gas supply device configured to supply an anode gas to a fuel cell and an ejector configured to merge an anode discharged gas, discharged from the fuel cell; with the anode gas to be supplied to the fuel cell. The fuel cell system includes an actuator configured to supply the anode discharged gas to the ejector and a cathode gas supply device configured to supply a cathode gas to the fuel cell. A control method for A fuel cell system includes a cathode gas control step of controlling a pressure of the cathode gas to be supplied to the fuel cell according to a magnitude of a load that is required of the fuel cell, and an anode gas control step of increasing a differential pressure between the pressure of the cathode gas and a pressure of the anode gas by the anode gas supply device when the load is low compared to when the load is high.

Fuel cell system and control device therefor, and control method for fuel cell system

A fuel cell system includes a fuel cell configured to be supplied with an anode gas and a cathode gas and generate electric power, a compressor configured to supply the cathode gas to the fuel cell, a turbine configured to be supplied with a cathode discharged gas discharged from the fuel cell and generate power, an electric motor connected to the compressor and the turbine and configured to perform power running and regeneration, a combustor disposed between the fuel cell and the turbine and configured to mix and combust the cathode gas and the anode gas, a cooler configured to cool the cathode gas that is supplied from the compressor to the fuel cell, a bypass passage configured to supply the cathode gas from an upstream side of the cooler to the combustor by bypassing the cooler and the fuel cell, and a bypass valve disposed in the bypass passage.

Fuel cell system and method for controlling fuel cell system including power recovery mechanism

A fuel cell system calculates a target value of a flow rate of cathode gas to be supplied to a fuel cell stack according to a request of the fuel cell stack, controls a flow rate of the cathode gas to be supplied by the compressor according to an operating state of the fuel cell system, controls a bypass valve based on a target fuel cell supply flow rate so that the flow rate of the cathode gas to be supplied from the compressor to the fuel cell stack reaches the target fuel cell supply flow rate, and limits the flow rate of the cathode gas to be supplied by the compressor when the bypass valve has a predetermined opening and the flow rate of the cathode gas to be supplied to the fuel cell stack is not smaller than the target fuel cell supply flow rate.

Fuel cell system

Provided is a wet state control method for a fuel cell system in which cathode gas is supplied to a fuel cell while the cathode gas partially bypasses the fuel cell, the wet state control method being for controlling a wet state of the fuel cell by adjusting wet control parameters including a bypass valve opening degree, a cathode gas pressure, and a cathode gas flow rate. When the fuel cell is controlled to a wet side, at least either one of the cathode gas flow rate and the cathode gas pressure is adjusted in priority to adjustment of the bypass valve opening degree.

Wet state control method for fuel cell system and wet state control device for the same

A fuel cell system includes a compressor for supplying the cathode gas to the fuel cell, an anode gas discharge system for discharging anode off-gas discharged from the fuel cell into a cathode gas flow passage, a pulsating operation control unit for causing a pressure of the anode gas to pulsate based on an operating state of the fuel cell, a purge control unit for purging the anode off-gas into the cathode gas flow passage based on an impurity concentration of an anode of the fuel cell and a pressure of the anode, and a compressor control unit for controlling the compressor based on a purge flow rate controlled by the purge control unit, and the purge control unit for setting the pressure of the anode to a predetermined value determined according to a pulsating state of the anode gas.

Fuel cell system and control method for fuel cell system

A fuel cell system including a cathode gas supply system of a cathode gas bypass type includes a first flow rate sensor which detects a cathode gas flow rate to be supplied by the compressor, a second flow rate sensor which detects a cathode gas flow rate to be supplied to the fuel cell, a bypass valve which controls a cathode gas flow rate flowed in the bypass channel, a bypass valve controlling unit configured to execute an open/shut-off control of the bypass valve in accordance with an operation state of the fuel cell system, and a mismatch diagnosing unit configured to detect a mismatch of detected values of the first flow rate sensor and the second flow rate sensor based on the detected values of the both sensors during total shut-off of the bypass valve.

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

A fuel cell system comprises a compressor configured to supply the cathode gas to the fuel cell, an intercooler provided downstream of the compressor and configured to cool the cathode gas discharged from the compressor, a pressure regulating valve configured to adjust a pressure downstream of the intercooler, and a controller. The controller computes a first target pressure of the intercooler downstream pressure according to a target output of the fuel cell and computes a second target pressure of the intercooler downstream pressure according to the intercooler downstream temperature. Then, the controller sets smaller one of the first and second target pressures as a target pressure of the intercooler downstream pressure and controls the compressor and the pressure regulating valve according to the target pressure.

Fuel cell system and control method therefor

A fuel cell system includes a cathode gas supply unit, a cathode pressure detection unit, a fuel cell temperature detection unit configured to detect a temperature of the fuel cell, an internal resistance detection unit configured to detect an internal resistance of the fuel cell, a target cathode flow rate calculation unit configured to calculate a target cathode flow rate necessary for supply to the fuel cell based on an operating state of the fuel cell system, a cathode flow rate estimation unit configured to estimate a flow rate of the cathode gas according to the pressure of the cathode gas, the temperature of the fuel cell and the internal resistance of the fuel cell, and a cathode flow rate control unit configured to control the cathode gas supply unit based on the target cathode flow rate and the estimated flow rate of the cathode gas.

A fuel cell power plant stops anode gas supply to a fuel cell stackby an anode gas supply mechanismwhen an anode gas pressure in the fuel cell stackreaches an upper limit pressure, and resumes supplying the anode gas by the anode gas supply mechanismwhen the anode gas pressure in the fuel cell stacklowers to a lower limit pressure. A sensor-detects if a hydrogen supply amount supplied to the fuel cell stacksatisfies a required amount to generate a target generated power, and a controllercorrects the lower limit pressure in an increasing direction when the hydrogen supply amount does not satisfy the required amount, thereby suppressing a generated power of the fuel cell stackfrom reducing even when a flooding takes place in the fuel cell stack

Growing community of inventors

Kanagawa, Japan

Yousuke Tomita