Fuel cell system

Patent metadata

Field	Value
Publication number	US-9568925-B2
Application number	US-201113823998-A
Country	US
Kind code	B2
Filing date	Aug 10, 2011
Priority date	Aug 10, 2011
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

In a fuel cell system which controls an operation of a converter on the basis of a duty command value including a feedforward term, the deterioration of a response of the converter at a time of a rapid increase (a rapid decrease) of a load is suppressed. There is disclosed a fuel cell system comprising a converter disposed between a fuel cell and a load device, and a controller for controlling the operation of the converter on the basis of the duty command value including the feedforward term, wherein the controller calculates the feedforward term by use of a command value of a physical amount concerning the converter in an operation range where a requested power from the load device is in excess of a predetermined threshold value.

First claim

The invention claimed is:

1. A fuel cell system comprising:
a converter disposed between a fuel cell and a load device; and
a controller for controlling an operation of the converter on the basis of a duty command value including a feedforward term, the controller includes a computer system configured to control the fuel cell system, the computer system having a CPU, a RAM, and a ROM, the controller configured to receive input signals from a plurality of sensors located in the fuel cell system, and the controller configured to calculate equations based on the input signals,
wherein the controller calculates the feedforward term by use of a command value of a physical amount concerning the converter in an operation range where a requested power from the load device is in excess of a predetermined threshold value, and
wherein the controller calculates the feedforward term on the basis of:
an inlet voltage command value of the converter; and
an outlet voltage command value of the converter, and
wherein the controller calculates the feedforward term D FF in accordance with the following equation:
D FF =1− V REL _ L /V REF _ H ,

in which V REF _ L is the inlet voltage command value of the converter, and V REF _ H is the outlet voltage command value of the converter.

2. The fuel cell system according to claim 1 ,
wherein the controller calculates the inlet voltage command value of the converter on the basis of current voltage characteristics of the fuel cell and an inlet current command value of the converter.

3. The fuel cell system according to claim 1 ,
wherein the controller calculates the inlet voltage command value of the converter on the basis of the current voltage characteristics of the fuel cell, current power characteristics of the fuel cell, and a power command value of the fuel cell.

4. The fuel cell system according to claim 1 ,
wherein the controller calculates the inlet voltage command value of the converter on the basis of the current voltage characteristics of the fuel cell, loss characteristics of the converter, and an outlet current command value of the converter.

5. A fuel cell system comprising:
a converter disposed between a fuel cell and a load device; and
a controller for controlling an operation of the converter on the basis of a duty command value including a feedforward term, the controller includes a computer system configured to control the fuel cell system, the computer system having a CPU, a RAM, and a ROM, the controller configured to receive input signals from a plurality of sensors located in the fuel cell system, and the controller configured to calculate equations based on the input signals,
wherein the controller calculates the feedforward term by use of a command value of a physical amount concerning the converter in an operation range where a requested power from the load device is in excess of a predetermined threshold value, and
wherein the controller calculates the feedforward term on the basis of:
an inlet voltage command value of the converter; and
an outlet voltage command value or a measured outlet voltage value of the converter, and
wherein the controller calculates the feedforward term D FF in accordance with the following equation in an operation range where the requested power from the load device is not more than the predetermined threshold value:

D
FF

=

2
⁢

⁢
Lf

×

V
MES_H

-

V
MES_L

V
MES_H

×

V
MES_L

×

I
REF

Where L an inductance of a reactor in the converter, f is an operation frequency of the converter, V MES _ H is the measured outlet voltage value of the converter, V MES _ L is a measured inlet voltage value of the converter, and I REF is the inlet current command value of the converter.

Assignees

• Kaneko Tomohiko
• Toyota Motor Co Ltd

Inventors

• Kaneko Tomohiko

Classifications

• H01M8/04559

  of fuel cell stacks · CPC title

• H01M2250/20

  Fuel cells in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M16/006

  of fuel cells with rechargeable batteries · CPC title

• Y02T90/34

  Cross-Sectional Technologies · mapped topic

• Y02T90/32

  Cross-Sectional Technologies · mapped topic