Fuel cell system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKenji Umayahara, Takeshi Maenaka, Atsushi Imai
Life of this patent
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Abstract
Provided is a fuel cell system that can change the number of active phases in a DC/DC converter in order to prevent overcurrent from flowing through one point (e.g., a reactor of the DC/DC converter) in the system. In step S1, whether or not the system is in a state that causes a rapid change in a voltage command value is checked. If the system is in a state that causes a rapid change in the voltage command value, the processing goes to step S2, and if not, the processing goes to step S3. In step S2, a DC/DC converter is prohibited from being driven in a single phase and the processing ends. In step S3, the DC/DC converter is permitted to be driven in a single phase and the processing ends.
Claims7
A fuel cell system comprising:
- a fuel cell;
- a voltage converting system configured to be provided with a plurality of phases, the voltage converting system configured such that the number of active phases can be changed;
- a load device;
- and
- a power storage device connected to a primary side of the voltage converting system;
- wherein the fuel cell is connected to a secondary side of the voltage converting system,
- wherein the load device is connected to at least one of the primary and secondary sides of the voltage converting system, and
- wherein the voltage converting system is programmed to change a duty ratio of a switching pulse if a difference is caused due to a response lag between an output voltage command value commanded to the fuel cell and an actual output voltage value of the fuel cell,
- the fuel cell system further comprising:
- a detection unit that detects a system state that causes a certain amount of change or more in an output voltage command value for the fuel cell;
- and
- a prohibition system that is programmed to prohibit the voltage converting system from being driven in a predetermined number of phases or less if the system state that causes a certain amount of change or more in an output voltage command value for the fuel cell is detected.
Dependencies are inferred from the claim text.