Fuel cell engine hydrogen supply control method and device based on double-nozzle ejector

Abstract

The invention provides a fuel cell engine hydrogen supply control method and device based on a double-nozzle ejector, and relates to the field of fuel cell engine hydrogen supply, and the method comprises the steps that when the hydrogen flow is smaller than a threshold value A, the threshold value A is the threshold value for switching a first nozzle to a second nozzle, and a first proportional valve carries out PID adjustment operation on the first nozzle according to the duty ratio B value; when the hydrogen flow is increased to the threshold value A and continues to be increased, the first proportional valve reduces the duty ratio C from the duty ratio B to obtain the duty ratio D, the D is kept constant, the second nozzle is opened, and the second proportional valve is adjusted according to the duty ratio E until the hydrogen flow reaches the target hydrogen flow; and after the target hydrogen flow is achieved, the constant duty ratio of the first valve is relieved, and the first proportional valve and the second proportional valve follow for control and adjustment. Under the condition that the hardware basis of the ejector is not changed, the control strategy of the proportional valve is changed to improve the ejection capacity of the ejector, and the hydrogen circulation efficiency of the galvanic pile is improved.

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