Hydrogen pressure control system and method for fuel battery backup power supply system

Abstract

The invention relates to a hydrogen pressure control system and a method for a fuel battery backup power supply system. The hydrogen pressure control system comprises a main hydrogen valve, a hydrogen feeding valve and a hydrogen exhaust valve, wherein the main hydrogen valve, the hydrogen feeding valve and the hydrogen exhaust valve are connected in sequence through pipelines; a hydrogen feeding pressure sensor is also arranged on the pipeline between the main hydrogen valve and the hydrogen feeding valve; an electric pile is also connected to the pipeline between the hydrogen feeding valve and the hydrogen exhaust valve; the hydrogen feeding pressure sensor is also connected with a single-chip microcomputer for cyclically detecting a hydrogen feeding pressure output signal; the main hydrogen valve, the hydrogen feeding valve and the hydrogen exhaust valve are connected with the single-chip microcomputer and are controlled to be switched on and switched off through the single-chip microcomputer. When the output signal of the hydrogen feeding pressure sensor is lower than a set value, the hydrogen pressure control system effectively eliminates interference caused by a negative pressure phenomenon of a hydrogen pipeline, and can accurately judge whether the hydrogen feeding pressure sensor has a zero-point drifting problem and effectively avoid the phenomenon that the system reports a failure of the hydrogen feeding pressure sensor by mistake, so that the diagnosis accuracy of the system is improved, and the reliability of the system during standby is guaranteed.

Description

technical field [0001] The invention relates to a control system, more specifically, a gas pressure control system and method related to a fuel cell backup power supply system. Background technique [0002] In the existing fuel cell backup power system, hydrogen pressure control is indispensable. In the existing fuel cell backup power system, generally only the hydrogen pressure of the control system can be kept within the normal range when the system is running. The diffusion of hydrogen molecules will cause negative pressure in the hydrogen pipeline, the output signal of the pressure sensor will be lower than the zero point signal, and the system will mistakenly believe that the zero point drift of the hydrogen into the pressure sensor (assuming that the zero point signal is 0.5V, set when the output signal is lower than When it is 0.4V, it is judged as the sensor zero drift), and a wrong fault message is generated. Contents of the invention [0003] Aiming at the defic...

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Problems solved by technology

[0002] In the existing fuel cell backup power system, hydrogen pressure control is indispensable. In the existing fuel cell backup power system, generally only the hydrogen pressure of the control system can be kept within the normal range when the system is running. The diffusion of hydrogen molecules will cause negative pressure in the hydrogen pipeline, the output signal of the pressure sensor will be lower than the zero point signal, and the system will mistakenly believe that the zero point drift of the hydrogen into the pressure sensor (assuming that the zero point signal is 0.5V, set when the output signal is lower than When it is 0.4V, it is judged as the sensor zero drift), and a wrong fault message is generated

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