Fuel cell system and method for controlling the same

Patent metadata

Field	Value
Publication number	US-9786930-B2
Application number	US-201414523899-A
Country	US
Kind code	B2
Filing date	Oct 26, 2014
Priority date	Jun 11, 2014
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A fuel cell system and a method for controlling the same are provided. The method includes rapidly increasing an angular speed of a rotating magnetic field of an induction motor to maximize iron loss of the induction motor, thereby resulting in an increase in the temperature of a rise cell stack. The method further includes eliminating torque of a driving motor generated by an increase in the angular speed of the rotating magnetic field, using a torque eliminator. The torque eliminator includes a P-stage reducer or a hydraulic break.

First claim

What is claimed is:

1. A method for controlling an operation of a fuel cell system, comprising:
increasing, by a controller, an angular speed of a rotating magnetic field of an induction motor, which is driven by a signal output from an inverter configures to receive power from a fuel cell stack, to maximize iron loss of the induction motor, thereby and increase a temperature of a fuel cell stack;
eliminating, by the controller, torque, generated due to an increase in the angular speed, of a driving motor using a torque eliminator, wherein the torque eliminator includes a park-stage reducer or hydraulic brake;
increasing, by the controller, a value of a current command of the motor in order to increase an induction current of the induction motor after increasing the angular speed of the rotating magnetic field;
outputting, by the controller, a gear change request signal so as to shift the speed change gear to the P gear when the speed change gear is not engaged to the P gear; and
increasing, by the controller, the angular speed of the rotating magnetic field when the speed change gear is shifted to the P gear in response to the gear change request signal.

2. The method of claim 1 , further comprising:
determining, by the controller, whether a fuel cell vehicle is in a cold start environment, wherein an external temperature of a fuel cell vehicle is equal to or less than a predetermined temperature; and
increasing, by the controller, the angular speed in response to determining that the fuel cell vehicle is in the cold start environment.

3. A fuel cell system comprising:
a fuel cell stack;
an inverter configured to receive power from the fuel cell stack;
an induction motor driven by a signal output from the inverter;
a controller configured to:
rapidly increase an angular speed of a rotating magnetic field of the induction motor to maximize iron loss of the induction motor, and to increase a temperature of the fuel cell stack;
eliminate torque of the induction motor which is increased due to an increase in the angular speed of the rotating magnetic field, using a torque eliminator, wherein the torque eliminator includes a park-stage reducer or a hydraulic break;
increase a value of a current command of the motor to increase an induction current of the induction motor after increasing the angular speed of the rotating magnetic field;
output a gear change request to shift the speed change gear to engage the P gear when the speed change gear is not engaged to the P gear; and
increase the angular speed of the rotating magnetic field when the speed change gear is shifted to the P gear in response to the gear change request.

4. The fuel cell system of claim 3 , wherein the controller is further configured to:
determine whether a fuel cell vehicle is in a cold start environment wherein an external temperature of a fuel cell vehicle is equal to or less than a predetermined temperature; and
increase the angular speed in response to determining that the fuel cell vehicle is in a cold start environment.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Kwon Soon Woo
• Lee Joon Yong

Classifications

• H01M2250/20

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

• B60L11/18

  Operations & Transport · mapped topic

• H01M8/04701

  Temperature · CPC title

• H01M8/04268

  Heating of fuel cells during the start-up of the fuel cells · CPC title

• H01M8/0432

  Temperature; Ambient temperature · CPC title