A control method of multi-mode fuel cell system

Abstract

The invention relates to a control method of a multi-mode fuel cell system. According to the control method, the fuel cell system has an economic mode, a normal mode and a motion mode by changing theair stoichiometric ratio, the hydrogen circulation ratio and the gas supply pressure of a fuel cell stack. According to the control method, the performance of the fuel cell system is essentially improved on the basis of the dynamic property and economy requirements of the whole vehicle, so that the dynamic response capability and recovery capability of the fuel cell system are enhanced. In the economic mode, the fuel cell system has the highest comprehensive efficiency, the lowest accessory energy consumption and the limited dynamic response capability; in a normal mode, the comprehensive efficiency of the fuel cell system is slightly reduced, and the power response capability is enhanced; in the motion mode, the comprehensive efficiency of the fuel cell system is obviously reduced, the energy consumption of accessories is high, the dynamic response capability is the strongest, and the actual driving experience of a driver can be completely met.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a control method for a multi-mode fuel cell system. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of fuel into electrical energy, and has been hailed as the fourth generation of power generation technology after hydropower, thermal power, and nuclear power. Fuel cell vehicles are one of the most well-known hydrogen energy industry applications. Because fuel cell vehicles have the advantages of zero emissions, fast refueling, and long battery life, they are known as an important development direction for new energy vehicles in the future. [0003] At present, the operation of the fuel cell system is mainly affected by the performance of the fuel cell stack and the air compressor. During actual road driving, it will experience frequent starting, loading, unloading, and parking processes. The transient response capability...

AI Technical Summary

Problems solved by technology

[0009] In view of the problems existing in the prior art, the present invention provides a control method for a multi-mode fuel cell system. The method forms an economical mode and a normal mode by changing the fuel cell stack air metering ratio, hydrogen circulation ratio and gas supply pressure. And sports mode, which essentially changes the performance of the fuel cell stack, adjusts the dynamic response and recovery ability, and solves the problem that the fuel cell system cannot meet the continuously changing dynamic demand under actual working conditions, so as to meet the power use demand

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