Fuel cell system and fuel cell system control method
AssigneesHyundai Motor Company, Kia Corporation
InventorsJun Su Lee, Dae Jong Kim, Jae Won Jung
Life of this patent
Estimating the term…
Abstract
A fuel cell system includes a fuel cell stack and a battery that are connected to a high voltage line in parallel, a converter connected to the high voltage line and the battery while being located therebetween and configured to control a voltage at the high voltage line, and a controller, in a stop control mode of the fuel cell stack, when an error occurs in a drop control of an output voltage of the fuel cell stack, the controller dropping the voltage at the high voltage line under the output voltage of the fuel cell stack by the converter to drop the output voltage of the fuel cell stack.
Claims10
A fuel cell system comprising:
- a fuel cell stack and a battery that are connected to a high voltage line in parallel;
- an air compressor configured to send air to a cathode of the fuel cell stack;
- and
- an air adjustment valve configured to adjust the air flowing from the air compressor to the cathode;
- a converter connected to and positioned between the high voltage line and the battery, the converter being configured to control a voltage at the high voltage line;
- and
- a controller operatively connected to the sir compressor, the air adjustment valve, and the converter, and configured to control an output voltage of the fuel cell stack to be between a preset voltage upper limit value and a preset voltage lower limit value in a stop control mode of the fuel cell stack, by adjusting a speed of the air compressor or the air adjustment valve in a state where a hydrogen supply to the fuel cell stack is maintained;
- wherein, based on a state in which the output voltage of the fuel cell stack is maintained above the preset voltage upper limit value in a the stop control mode of the fuel cell stack, the controller is configured to drop the voltage at the high voltage line to follow a target voltage value preset between the preset voltage upper limit value and the preset voltage lower limit value by the converter to drop the output voltage of the fuel cell stack.
A fuel cell system control method comprising:
- entering, by a controller, a fuel cell stack into a stop control mode;
- controlling, by the controller, an output voltage of the fuel cell stack to be between a preset voltage upper limit value and a preset voltage lower limit value in a stop control mode, by adjusting a speed of an air compressor or an air adjustment valve in a state where a hydrogen supply to the fuel cell stack is maintained;
- determining, by the controller, whether the output voltage of the fuel cell stack is maintained above the preset voltage upper limit value;
- and
- dropping, by the controller, the voltage at the high voltage line to follow a target voltage value preset between the preset voltage upper limit and the preset voltage lower value via a converter, based on determining that the output voltage of the fuel cell stack is maintained above the preset voltage limit value in the stop control mode.
Dependencies are inferred from the claim text.