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MarketScreener Homepage  >  Equities  >  Tokyo  >  Nissan Motor Co Ltd    7201   JP3672400003

NISSAN MOTOR CO LTD

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Patent Issued for Fuel Cell System And Control Method For Fuel Cell System (USPTO 10,367,212): Nissan Motor Co. Ltd.

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08/14/2019 | 04:54pm EDT

2019 AUG 14 (NewsRx) -- By a News Reporter-Staff News Editor at Energy Business Daily -- From Alexandria, Virginia, NewsRx journalists report that a patent by the inventor Ichikawa, Yasushi (Kanagawa, Japan), filed on May 9, 2014, was published online on August 12, 2019.

The patent’s assignee for patent number 10,367,212 is Nissan Motor Co. Ltd. (Yokohama-shi, Kanagawa, Japan).

News editors obtained the following quote from the background information supplied by the inventors: “A circulation-type fuel cell system in which an ejector is provided in a supply passage for supplying anode gas to a fuel cell and excess anode gas not consumed by the fuel cell is sucked by the ejector and supplied to the fuel cell is known as one of fuel cell systems.

“JP2008-190336A discloses a technique for controlling an injection timing of an injector provided upstream of an ejector so that a supply flow rate obtained by adding an injection flow rate from the injector and a suction flow rate by the ejector becomes a flow rate satisfying power required from a load.”

As a supplement to the background information on this patent, NewsRx correspondents also obtained the inventor’s summary information for this patent: “However, since a discharge flow rate from the ejector is controlled using the injector in the above technique, a flow rate necessary for power generation is ensured, but excess anode gas circulated to the fuel cell by the ejector may possibly become insufficient.

“The present invention was developed, focusing on such a problem and aims to provide a fuel cell system and a control method for fuel cell system for ensuring a circulation flow rate of anode gas circulated to a fuel cell by an ejector.

“According to one aspect of the present invention, a fuel cell system supplies anode gas and cathode gas to a fuel cell and causes the fuel cell to generate power according to a load. The fuel cell system includes a supply passage configured to supply the anode gas to the fuel cell, a pressure control valve that provided in the supply passage and configured to adjust a pressure of the anode gas supplied to the fuel cell, and a discharge passage configured to discharge the anode gas from the fuel cell. Furthermore, the fuel cell system includes an ejector provided in the supply passage and a control unit configured to pulsate the pressure of the anode gas supplied to the ejector. The ejector is configured to suck the anode gas discharged to the discharge passage and circulate the anode gas to the fuel cell by the anode gas supplied from the pressure control valve.”

The claims supplied by the inventors are:

“The invention claimed is:

“1. A fuel cell system for supplying anode gas and cathode gas to a fuel cell and causing the fuel cell to generate power according to a load, comprising: a supply passage configured to supply the anode gas to the fuel cell; a pressure control valve provided in the supply passage, the pressure control valve being configured to adjust a pressure of the anode gas supplied to the fuel cell; a discharge passage configured to discharge the anode gas from the fuel cell; an ejector provided in the supply passage, the ejector being configured to suck the anode gas discharged to the discharge passage and circulate the anode gas to the fuel cell using the anode gas supplied from the pressure control valve; and a controller configured to control the pressure control valve such that the pressure of the anode gas supplied to the fuel cell via the ejector is larger than a predetermined pressure to pulsate the pressure of the anode gas.

“2. The fuel cell system according to claim 1, wherein the predetermined pressure is set such that a supply flow rate of the anode gas is larger than a circulation limit flow rate and a circulation flow rate of the anode gas becomes zero.

“3. The fuel cell system according to claim 1, further comprising: a sensor configured to detect the pressure of the anode gas supplied to the fuel cell from the ejector, wherein the controller is configured to pulsate the pressure of the anode gas supplied to the fuel cell on a basis of a signal from the sensor and target values of predetermined upper limit pressure and lower limit pressure.

“4. The fuel cell system according to claim 1, wherein: the controller is configured to pulsate the pressure of the anode gas when a parameter indicating the load or a supply flow rate of the anode gas supplied to the ejector is smaller than a threshold value determined in advance; and the threshold value is determined in advance on a basis of a circulation flow rate determined such that a minimum amount of steam necessary to humidify the fuel cell is supplied to the fuel cell when the anode gas is circulated.

“5. The fuel cell system according to claim 4, wherein: when the parameter is larger than the threshold value, the controller is configured to not pulsate the pressure of the anode gas.

“6. The fuel cell system according to claim 4, wherein: the controller is configured to make a pulsation width at a time of pulsating the pressure of the anode gas smaller when the parameter is large than when the parameter is small.

“7. The fuel cell system according to claim 1, wherein: when pulsating the pressure of the anode gas, the controller is configured to increase the pressure of the anode gas by opening the pressure control valve for a predetermined time.

“8. The fuel cell system according to claim 4, wherein: the controller is configured to make the threshold value smaller when the fuel cell is in a wet state than when the fuel cell is in a dry state.

“9. The fuel cell system according to claim 8, wherein: the controller is configured to reduce a pulsation upper limit pressure of the anode gas according to the circulation flow rate to make a pulsation width smaller in a range of the parameter from a value of making the circulation flow rate of the anode gas zero in a constant pressure control of making the pressure of the anode gas constant to the threshold value.

“10. A control method for a fuel cell system with a supply passage for supplying anode gas to a fuel cell, a pressure control valve provided in the supply passage, a discharge passage for discharging the anode gas from the fuel cell, and an ejector for sucking the anode gas discharged to the discharge passage and circulating the anode gas to the fuel cell using the anode gas supplied from the pressure control valve, the control method comprising: a control step of controlling a pressure of the anode gas supplied to the fuel cell on a basis of a load of the fuel cell; and a pulsation control step of controlling the pressure of the anode gas supplied to the fuel cell via the ejector so as to be larger than a predetermined pressure to pulsate the pressure of the anode gas.

“11. The fuel cell system according to claim 1, further comprising the fuel cell configured to receive the anode gas and the cathode gas and generate power.

“12. The fuel cell system according to claim 1, wherein: the ejector comprises a nozzle and a diffuser, the nozzle is configured to accelerate a flow velocity of the anode gas supplied from the pressure control valve and inject the anode gas to the diffuser, and the diffuser is configured to suck the anode gas discharged to the discharge passage and circulate the anode gas supplied from the pressure control valve and the anode gas discharged to the discharge passage to the fuel cell.

“13. The fuel cell system according to claim 12, wherein: a supply flow rate of the anode gas supplied to the nozzle is calculated on a basis of the required load and corresponds to an amount of the anode gas consumed as power is generated by the fuel cell, and the diffuser is configured to discharge the anode gas supplied from the pressure control valve and the anode gas discharged to the discharge passage to the fuel cell at an anode gas total flow rate obtained by adding a circulation flow rate of the anode gas discharged to the discharge passage and the supply flow rate of the anode gas injected from the nozzle.

“14. The fuel cell system according to claim 1, wherein: the controller is configured to control the pressure control valve such that the pressure of the anode gas supplied to the fuel cell via the ejector pulsates between a predetermined upper limit pressure and a predetermined lower limit pressure.

“15. The fuel cell system according to claim 14, wherein: the predetermined upper limit pressure is set such that a flow rate ratio of a circulation flow rate of the anode gas discharged to the discharge passage to a flow rate of the anode gas consumed by the fuel cell is a predetermined percentage.

“16. A fuel cell system comprising: a fuel cell that receives anode gas and cathode gas and generates power according to a load; a high-pressure tank that stores and supplies anode gas to the fuel cell; a supply passage that connects the high-pressure tank and the fuel cell; a pressure control valve provided in the supply passage that adjusts a pressure of the anode gas supplied by the high-pressure tank; a discharge passage that discharges anode off-gas from the fuel cell; an ejector provided in the supply passage downstream of the pressure control valve, wherein the ejector sucks the anode off-gas discharged to the discharge passage using the anode gas supplied from the pressure control valve, and circulates the anode off-gas and the anode gas supplied from the pressure control valve as the anode gas supplied to the fuel cell; and a controller programmed to control the pressure control valve such that a pressure of the anode gas supplied to the fuel cell via the ejector is larger than a predetermined pressure to pulsate the pressure of the anode gas.”

For additional information on this patent, see: Ichikawa, Yasushi. Fuel Cell System And Control Method For Fuel Cell System. U.S. Patent Number 10,367,212, filed May 9, 2014, and published online on August 12, 2019. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=10,367,212.PN.&OS=PN/10,367,212RS=PN/10,367,212

(Our reports deliver fact-based news of research and discoveries from around the world.)

Copyright © 2019 NewsRx LLC, Energy Business Daily, source Science Newsletters

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Debt 2020 6 752 B
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