Hydrogen fuel cell vehicle and fuel cell purging system thereof

Abstract

The invention provides a hydrogen fuel cell vehicle and a fuel cell purging system thereof. The hydrogen fuel cell purging system comprises a hydrogen fuel cell, a power battery, a storage battery, aDC / DC converter and a low-voltage direct-current bus; the hydrogen fuel cell is provided with an electric accessory; the high-voltage side of the DC / DC converter is connected with the power battery, while the low-voltage side is connected with the low-voltage direct-current bus; the storage battery and the electric accessory are connected with the low-voltage direct-current bus; a switch is arranged on a circuit, which is connected with the low-voltage direct-current bus, of the electric accessory; the switch is closed in the shutdown process of the fuel cell, and the power battery supplies power for the electric accessory through the DC / DC converter and the storage battery; and when it is detected that the DC / DC converter works abnormally, the switch is controlled to be disconnected, andthe power supplying for the electric accessory is stopped. The DC / DC converter and the storage battery are both adopted for supplying power for the electric accessory, so that when the DC / DC converterworks unstably, the storage battery can supply power for the electric accessory, thereby improving the shutdown purging stability of the fuel cell.

Description

technical field [0001] The invention belongs to the technical field of fuel cell vehicle control, and in particular relates to a hydrogen fuel cell vehicle and a fuel cell purging system thereof. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of fuel into electrical energy. It can continuously output electrical energy only by feeding fuel and oxidant. It has the advantages of high energy conversion efficiency, clean and environmentally friendly, and no need for charging. Due to its long driving range and short hydrogenation time, fuel cell vehicles have become an important direction for the development of new energy vehicles, especially hydrogen-fueled proton exchange membrane fuel cells, which can start quickly at room temperature due to their low operating temperature , has become the most ideal power source and backup power source for vehicles. [0003] For hydrogen fuel cell vehicles, due to the special characteristics o...

AI Technical Summary

Problems solved by technology

However, using the battery will cause over-discharge of the battery, which cannot meet the power supply requirements of other low-voltage electrical equipment on the vehicle; and when the fuel cell is used for power supply, the DC / DC conversion module cannot provide power due to the unstable voltage generated by the fuel cell. The purge system provides a stable voltage, which will cause poor power supply stability of the purge system

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