Air compressor rotating speed correction method of fuel cell system

Abstract

The invention discloses a method for correcting the rotating speed of an air compressor of a fuel cell system. The method comprises the following steps of after the performance of the system is attenuated, correspondingly correcting according to the required output power sent to the system by a vehicle control unit, and inquiring a system required output power air flow curve and a system required output power air pressure curve; outputting the required air flow and the required air pressure to adjust the rotating speed of the air compressor, and improving the air flow and the air pressure by correcting the rotating speed of the air compressor so that the actual output power of the system is consistent with the required output power. According to the method, the rotating speed of the air compressor is finally corrected by proposing the correction coefficient, the problem that the actual output power and the required output power of the fuel cell system deviate due to stack attenuation is solved, control precision of gas distribution can be improved, and thus the service life of the whole vehicle power battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for correcting the rotational speed of an air compressor in a fuel cell system. Background technique [0002] The scheme of using the power battery as the main driving energy and the fuel cell as the range extender, based on the fuel cell system used to charge the power battery of the vehicle, can greatly extend the battery life of the electric vehicle, so it is the best choice among the existing fuel cells App direction. The fuel cell system outputs its own power by identifying the required power of the electric vehicle, and controls the fuel reaction through the speed adjustment of the air compressor. The air compressor speed of the fuel cell system is mainly adjusted by the difference between the required air flow and the actual air flow. Secondly, because the air flow and air pressure have a corresponding relationship, the air pressure also affects the air compre...

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Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the present invention provides a method for correcting the rotational speed of the air compressor of the fuel cell system. By proposing a correction coefficient, the rotational speed of the air compressor is finally corrected, so as to solve the problem of the difference between the actual output power of the fuel cell system due to stack decay. The problem of demand output power deviation can improve the control accuracy of gas distribution, thereby increasing the service life of the vehicle power battery

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