Fuel cell air system decoupling control method and device and storage medium

Abstract

The invention provides a fuel cell air system decoupling control method. The method comprises the following steps of determining corresponding target air pressure and target air flow according to a working point of the fuel cell, checking the corresponding calibration tables through the target air pressure and the target air flow, and acquiring the feed-forward throttle valve opening degree and the feed-forward air compressor rotating speed, acquiring real-time air in-pile pressure and air in-pile flow, calculating the difference value between the target air pressure and the air in-pile pressure, conducting PID control on the pressure difference, and acquiring a throttle valve opening adjustment value, checking a calibration table for correcting the corresponding opening degree to the rotating speed according to the opening degree of the feed-forward throttle valve and the opening degree adjustment value of the throttle valve to obtain a rotating speed correction value of the air compressor, calculating the difference value between the target air flow and the air in-pile flow, conducting PID control on the flow difference, and acquiring the rotating speed adjustment value of the air compressor, checking a calibration table for correcting the opening degree by the corresponding rotating speed according to the feedforward air compressor rotating speed and the air compressor rotating speed adjusting value to obtain a throttle valve opening degree correction value, summing to obtain the final opening degree of the throttle valve, and summing to obtain the final rotating speed of the air compressor. The method is simple and easy to implement, high in practicability and high in accuracy.

Description

technical field [0001] The invention relates to the field of fuel cell air system control, in particular to a fuel cell air system decoupling control method. Background technique [0002] Facing the severe requirements of environmental pollution, the automotive market is transforming from traditional chemical energy to new energy. Among them, the hydrogen fuel cell system is being developed by major automobile manufacturers all over the world due to its advantages of zero emission, high efficiency and wide range of sources. The air supply system involved is a unit that consumes large power as a system accessory, and the control and optimization of its own system is of great significance to the stable operation and output efficiency of the entire fuel cell system. [0003] Air system control involves the control of two important parameters: air pressure and air flow. The two parameters of air pressure and air flow are highly coupled in the actual control process, and it is ...

AI Technical Summary

Problems solved by technology

The existing technology uses advanced control methods, such as transfer function decoupling, feedback linearization, active disturbance rejection control, etc., which can achieve the effect of decoupling control to a certain extent, but it is relatively complicated and less practical

Among them, the patent CN111293333A performs decoupling control by solving the correction coefficient, and the process of solving the coefficient is relatively complicated; the patent CN110970642A uses the flow difference as the PID correction of the throttle valve opening and the pressure difference as the PID correction of the air compressor speed. The modified PID decoupling method has a slightly slower response speed to air flow and air pressure; the patent CN111403783A uses self-interference control to achieve decoupling, which is more theoretical but less practical

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