A control method for a multi-mode fuel cell system
A technology of fuel cell system and control method, which is applied in the direction of fuel cell, fuel cell additives, reactant parameter control, etc., and can solve the problem that the fuel cell system cannot meet the dynamic demand, etc.
Active Publication Date: 2021-05-04
CHINA FIRST AUTOMOBILE
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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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[0055] This embodiment provides a control method for a multi-mode fuel cell system. The method controls the relationship between the air metering ratio and the current by adjusting the speed of the air compressor and the opening of the back pressure valve as follows: figure 2 As shown; adjust the hydrogen supply and return hydrogen assembly, control the relationship between the hydrogen circulation ratio and the current as image 3 Shown; control air compressor speed, back pressure valve opening and hydrogen supply and return hydrogen assembly, control the relationship between air supply pressure and current as Figure 4 As shown, the lower boundary in the figure refers to maintaining the normal operation of the fuel cell system and controlling the minimum value of the air supply pressure. If the air supply pressure is lower than the lower boundary, the fuel cell stack cannot work normally.
[0056] Taking the fuel cell stack at 30A as the starting point for variable load, th...
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The invention relates to a control method of a multi-mode fuel cell system. The control method enables the fuel cell system to have an economical mode, a normal mode and a sports mode by changing the fuel cell stack air metering ratio, hydrogen circulation ratio and air supply pressure. The control method essentially improves the performance of the fuel cell system and enhances its dynamic response and recovery capabilities based on the vehicle's power and economic requirements. In the economic mode, the overall efficiency of the fuel cell system is the highest, the energy consumption of accessories is the lowest, and the dynamic response capability is limited; The overall efficiency has dropped significantly, the energy consumption of accessories is high, and the dynamic response capability is the strongest, which can fully meet the driver's actual driving experience.
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...
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IPC IPC(8): H01M8/04082H01M8/04089H01M8/04746
CPCH01M8/04104H01M8/04201H01M8/04753Y02E60/50
Inventor 王宇鹏赵洪辉马秋玉都京丁天威赵子亮
Owner CHINA FIRST AUTOMOBILE