Hydrogen supply control device for hydrogen internal combustion engine

Abstract

The invention relates to a hydrogen supply control device for a hydrogen internal combustion engine. The hydrogen supply control device comprises a source of hydrogen for supplying hydrogen, a decompression device for decompressing the hydrogen from the source of hydrogen, a pressure regulating device for regulating pressure of the hydrogen from the decompression device, a hydrogen injection device for injecting the hydrogen form the pressure regulating device into the hydrogen internal combustion engine for combustion, and a control device for controlling control operation of the pressure regulating device. The control device can variably determine target injection pressure and the corresponding injection duration under the current operating conditions according to service conditions of the hydrogen internal combustion engine, and control the pressure regulating valve to cause actual injection pressure of the injection device to accord with the target injection pressure by command signals. The hydrogen supply control device can help regulate hydrogen supply pressure at all times according to different service conditions of the hydrogen internal combustion engine, thus realizing adaptive control of the pressure of hydrogen supply, effectively controlling tempering, lowering NOx emission and meeting requirements of stable operation of the hydrogen internal combustion engine under all operating conditions.

Description

technical field [0001] The invention relates to a hydrogen supply control device for a hydrogen internal combustion engine, in particular to an adaptive hydrogen supply pressure regulating device for a hydrogen internal combustion engine. Background technique [0002] With the reduction of oil resources, rising oil prices and stricter emission regulations, my country has designated hydrogen energy as one of the alternative energy sources for vehicles in the new century according to the sustainable development strategy. One of the main directions in the development of hydrogen energy power is the hydrogen engine. [0003] For hydrogen engines, the concentration range of the combustible mixture is wide, the equivalent concentration ranges from 0.3 to 1.5, and the combustion speed varies by more than 6 times near different stoichiometric ratios. Such as figure 1 As shown, the laminar combustion velocity of hydrogen and gasoline varies with the fuel equivalent concentration. C...

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Problems solved by technology

[0005] During the working process of the port-injected hydrogen internal combustion engine, due to the limitation of the nozzle flow characteristics and the different requirements for the amount of hydrogen injected under all working conditions, the traditional fixed-pressure hydrogen supply method is difficult to solve the problem of unstable hydrogen injection and low-load conditions. Insufficient power and torque output at high speed and heavy load

This is because the pressure of the hydrogen supply rail in the traditional port injection hydrogen internal combustion engine remains constant, and the hydrogen nozzle can only work at a fixed pressure. Limited by its flow characteristics, the minimum idling hydrogen injection duration t min It should not be less than the solenoid valve response time t0, otherwise the nozzle will not work stably; its maximum hydrogen injection duration is limited by factors such as valve timing and tempering, and different speeds correspond to different upper limit values ​​t max , so the duration of hydrogen injection can only be at t min and t max adjust between

Therefore, when the fixed hydrogen injection pressure is high enough to output higher power at high speeds, when the hydrogen engine is in the state of idling and light load, since the required cycle hydrogen injection amount is less, the cycle hydrogen injection The amount depends on the hydrogen injection duration and injection pressure, so when the fixed hydrogen injection pressure is higher, a smaller idle hydrogen injection duration t will be obtained min , so it is difficult to maintain the idling hydrogen injection duration t min greater than t 0 , in order to avoid fluctuations in the power and speed of the hydrogen engine caused by the unstable operation of the nozzle

In order to ensure the idling hydrogen injection duration t min greater than t 0 , it will limit the increase of fixed hydrogen injection pressure, so when the hydrogen engine is working at high speed and heavy load, it is not conducive to meeting the maximum flow requirements of the hydrogen engine and ensuring the power and torque output of the hydrogen internal combustion engine

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