Fuel cell system idle oxygen supply control method and system

Abstract

The invention discloses an idle oxygen supply control method and system for a fuel cell system. It is obtained after the vehicle is in an idling state and the electric energy of the second energy storage device reaches the set value, the air compressor of the oxygen supply subsystem in the fuel cell system is input through the fuel cell stack to work at the set power P0 ACS Oxygen is supplied to the fuel cell stack, and the excess electric energy generated by the fuel cell stack is consumed, so that the fuel cell stack's output of electric energy to the vehicle is zero. When the vehicle is idling, the fuel cell stack is used to supply power to the oxygen supply subsystem to consume the excess electric energy of the stack, so that the power output of the fuel cell stack to the whole vehicle is zero, which not only ensures that the stack maintains a low power working state, Shut down to ensure the power performance of the vehicle.

Description

technical field [0001] The invention belongs to fuel cell vehicle technology, and in particular relates to an oxygen supply control technology of a fuel cell system when the vehicle is idling. Background technique [0002] At present, the drive of fuel cell vehicles, especially hydrogen fuel cell vehicles, is mainly based on the "electric-electric hybrid" mode, that is, fuel cells are mainly used, and secondary energy storage devices such as power batteries, super capacitors and other auxiliary energy are supplemented. Hybrid drive mode. The oxygen supply subsystem in the fuel cell system usually uses the second energy storage device to supply power. [0003] The existing hydrogen fuel cell system includes a fuel cell stack, a booster circuit, and a fuel cell system controller. The output of the booster circuit includes connecting the high-voltage load in the fuel cell system and the electric energy output of the vehicle. When the vehicle is idling, the fuel cell system wi...

AI Technical Summary

Problems solved by technology

When the vehicle is idling, the fuel cell system will enter the standby mode and reduce its output voltage to reduce its power to the lowest limit. However, the output power of the entire fuel cell system to the vehicle's electrical energy is not zero, resulting in the inability to store more auxiliary energy. In the case of energy, the output of the stack system needs to be turned off. According to the current domestic technology, it takes at least 3 minutes to shut down and power off the stack, and the waiting time for restarting is too long, which not only leads to a greatly reduced power performance of the vehicle, but also leads to a very bad driving experience.

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