Hydrogen supply control method for hydrogen fuel cell vehicle

Abstract

The invention discloses a hydrogen supply control method for a hydrogen fuel cell vehicle. The method comprises the following steps: controlling a hydrogen injection valve for adjusting the hydrogen supply rate of an anode inlet of a fuel cell stack, controlling a hydrogen return pump for recycling hydrogen obtained by a gas-liquid separator connected with an anode outlet of the fuel cell stack, and controlling a drain valve for periodically draining liquid at the bottom of the gas-liquid separator. The opening degree of the hydrogen injection valve is based on feedforward control of the galvanic pile current, the deviation between the actual hydrogen pile-in pressure and a set value is also considered, the deviation is fed back to the opening degree of the hydrogen injection valve through pre-calibrated parameters via PID, and the influence of the deviation on the opening degree of the hydrogen injection valve is made up. Closed-loop control is carried out on the hydrogen in-pile pressure and the in-pile and out-pile pressure difference, the stability of the hydrogen pressure is improved, and then the stability of a fuel cell system is improved.

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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