A fuel cell system and its control method
A fuel cell system and fuel cell technology, applied to fuel cells, circuits, electrical components, etc., can solve the problems of air compressor surge, improper handling of target pressure and target speed changes, and achieve the effect of preventing surge.
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Embodiment 1
[0052] Embodiment 1 provides a fuel cell system control method, such as figure 2 Shown is the control method of the air compressor in the normal operation of the fuel cell system, including the following steps:
[0053] S101, judging whether purging is required according to the amount of liquid water in the cathode channel.
[0054] There are many ways to judge the amount of liquid water in the cathode flow channel. It can be judged whether purge is needed by judging whether the voltage of the fuel cell single chip is lower than the set voltage threshold. At this time, the fuel cell controller is connected to the corresponding fuel cell single chip through the input terminal. The voltage signal output terminal is used to obtain the single-chip voltage of the fuel cell.
[0055] S102. Perform purging if necessary.
[0056] During the operation of the fuel cell, if the voltage of the fuel cell is low, in order to remove the liquid water accumulated in the cathode channel, the...
Embodiment 2
[0062] In order to prevent the fuel cell system from starting up and running normally, the air compressor surge phenomenon, this embodiment 2 provides a fuel cell system control method on the basis of embodiment 1, such as image 3 Shown is the control method of the air compressor and throttle valve during the start-up process of the fuel cell system, including the following steps:
[0063] S201. Control the throttle valve to fully open and start the air compressor at the first set speed.
[0064] The fuel cell controller controls the full opening of the throttle valve and at the same time controls the start of the air compressor, and the target speed is the first set speed, preferably 0 rpm.
[0065] S202. Determine whether it is necessary to start up and purge, and if so, adjust the speed of the air compressor to the second set speed after the first set time.
[0066] According to the conditions, it is judged whether it is necessary to purge the liquid water accumulated in ...
Embodiment 3
[0071] In order to prevent the phenomenon of air compressor surge between the normal operation and shutdown of the fuel cell system, this embodiment 3 provides a fuel cell system control method on the basis of embodiment 1, such as Figure 4 As shown, the control mode of the air compressor and the throttle valve during the shutdown process of the fuel cell system includes the following steps:
[0072] S301. Determine whether to shut down and purge.
[0073] According to the conditions, it is judged whether it is necessary to purge the liquid water accumulated in the cathode flow channel. If so, control the throttle valve to fully open, and adjust the speed of the air compressor to the second set speed after the first set time. When the purge ends , the control air compressor is powered off and the throttle valve is closed.
[0074] The first setting time is 1s, and the second setting speed is the rated speed of the air compressor.
[0075] S302. If not, control the throttle ...
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