A fuel cell hydrogen supply control system and control method

Abstract

The invention relates to the field of fuel cells, and discloses a fuel cell hydrogen supply control system and a control method. The fuel cell hydrogen supply control system includes a hydrogen source, a hydrogen injection solenoid valve group, a stack hydrogen pressure measurement module, a fuel cell stack, and a hydrogen exhaust valve arranged in series in sequence, and the hydrogen injection solenoid valve group includes a compensation valve and a N A hydrogen injection valve, N is an integer, and N ≥ 2, N hydrogen injection valves are opened sequentially with an equal period T, and the compensation valve is used to suppress the sudden drop in the fuel cell stack pressure caused by the opening of the hydrogen exhaust valve. The present invention realizes the precise control of the hydrogen supply pressure through the control of the hydrogen injection valve, and solves the life problem caused by the long-term opening of the hydrogen injection valve and the large pressure fluctuation problem caused by the short-time closing of the hydrogen injection valve when the demand for high power is high. In addition, Through the control of the compensating valve, the pressure drop phenomenon in the fuel cell stack caused by the opening of the hydrogen exhaust valve is effectively suppressed.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a fuel cell hydrogen supply control system and a control method. Background technique [0002] As a high-efficiency, zero-pollution vehicle power source, fuel cells are ideal for vehicle power electrification. As a new type of green power source, fuel cell engines have gradually become the research focus of on-board engines due to their high efficiency and low emissions. The hydrogen supply control is one of the control cores of the fuel cell engine system. When the fuel cell system is working, the anode hydrogen pressure fluctuation will cause the performance of the fuel cell system to decline, and even affect the life of the fuel cell. [0003] Existing fuel cell systems generally adjust the valve opening by controlling the duty cycle of a single hydrogen injection valve driving cycle, thereby controlling the hydrogen pressure to meet the system power requirements. However, when the...

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Problems solved by technology

[0004] Based on the above problems, the object of the present invention is to provide a fuel cell hydrogen supply control system and control method to solve the life problem caused by the long-term opening of the hydrogen injection valve and the large pressure fluctuation caused by the short-time closure when the demand for high power is high.

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