A hydrogen fuel cell vehicle hydrogen supply control method

Abstract

The invention discloses a hydrogen supply control method for a hydrogen fuel cell vehicle, which includes the control of a hydrogen injection valve for adjusting the hydrogen supply rate at the anode inlet of a fuel cell stack, and the hydrogen gas obtained from a gas-liquid separator connected to the anode outlet of a fuel cell stack. The control of the hydrogen return pump for recycling, and the control of the drain valve that periodically discharges the liquid at the bottom of the gas-liquid separator. In the present invention, the opening of the hydrogen injection valve is not only based on the feedforward control of the stack current, but also takes into account the deviation between the actual hydrogen inlet pressure and the set value, and the deviation is fed back to the opening of the hydrogen injection valve through the PID through the pre-calibrated parameters Above, the influence of the deviation on the opening of the hydrogen injection valve is compensated. The invention performs closed-loop control on the pressure of hydrogen entering the stack and the pressure difference between entering and exiting the stack, so as to improve the stability of the hydrogen pressure and further improve the stability of the fuel cell system.

Description

technical field [0001] The invention relates to a hydrogen fuel cell, in particular to a hydrogen supply control method for a hydrogen fuel cell vehicle. Background technique [0002] In recent years, new energy vehicles have developed rapidly, and many countries have announced the time to ban the sale of fuel vehicles. In China, due to the guidance of national and local policies, fuel cell vehicles have made great progress. Fuel cell vehicles have a longer driving range and do not need frequent energy replenishment, which meets the travel needs of consumers. [0003] With the advancement of technology and the need for product promotion, higher requirements are put forward for fuel cell vehicles and fuel cell systems. Fuel cell systems have changed from auxiliary power battery-driven vehicles to vehicles mainly driven by fuel cell systems. This will inevitably put forward higher requirements on the response rate of the fuel cell system, so as to be able to meet various com...

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Problems solved by technology

[0005] In the prior art, the hydrogen into the stack is generally controlled based on the pressure value of hydrogen entering the stack and the pressure of air entering the stack. Due to the influence of various factors such as fuel cell reaction hysteresis and battery load, the conventional control method is slow and has poor stability.

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