Control method and system of fuel cell vehicle and fuel cell vehicle

Abstract

The invention provides a control method and system of a fuel cell vehicle and the fuel cell vehicle. The fuel cell vehicle comprises a fuel cell system and an energy storage device, when the temperature of the energy storage device is within a preset temperature interval, the energy storage device is in a high-efficiency mode, and when the temperature of the energy storage device is beyond the preset temperature, the energy storage device is in a low-efficiency mode. The control method comprises the steps that the output voltage of the fuel cell system is detected, if the output voltage reaches the preset voltage, the temperature of the energy storage device is adjusted to be out of the preset temperature interval, so that the energy storage device stores redundant electric quantity output by the fuel cell system in the low-efficiency mode, and the output voltage of the fuel cell system is reduced to be below the preset voltage. According to the control method of the fuel cell vehicle, the situation that the fuel cell system is damaged due to the fact that the output voltage of the fuel cell system is too high can be effectively avoided, and the good state of the fuel cell system is guaranteed.

Description

technical field [0001] The present application relates to the technical field of automobiles, in particular to a control method and system for a fuel cell vehicle and the fuel cell vehicle. Background technique [0002] The fuel cell vehicle is mainly powered by the fuel cell system, and whether the fuel cell system is good or not is very important to the fuel cell vehicle. The fuel cell system generates electricity through the fuel cell stack, the fuel is oxidized through an electrochemical reaction, and the energy released after the oxidation reaction is directly converted into electrical energy. A fuel cell stack has a membrane electrode assembly in which a polymer electrolyte membrane for the selective transport of hydrogen ions is sandwiched between a pair of electrodes formed of a porous material. Each electrode contains carbon powder as its main component. The carbon powder has a platinum metal catalyst, including the junction of the catalyst layer and the polymer el...

AI Technical Summary

Problems solved by technology

[0004] Under many working conditions, the load of the vehicle consumes little electricity. At this time, the electric energy output by the fuel cell system will be stored in the battery, and the battery will be fully charged soon , cannot continue to receive the electrical energy output by the fuel cell system, and the output voltage of the fuel cell stack will still remain at a relatively high potential. Therefore, the deterioration of the fuel cell stack will be improved to a limited extent, which will affect the health of the fuel cell system

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