Study On Injection Strategy Of Turbocharged Hydrogen Internal Combustion Engine

The threat of global warming and shortage of resources is becoming increasingly serious,and the emission regulations more stringent,making the researchers focus more and more on alternative fuels for vehicles.Hydrogen is paid great attention to for its advantages of regeneration,cleanness and environmental protection.Before the complete development of hydrogen fuel cell technology,the great advantages of technical maturity,economic cost,etc.of hydrogen fuel engine,makes hydrogen the best choice of alternative fuels for vehicles.This paper well studies the tempering phenomenon during the hydrogen fuel engine development process as following:Firstly,a one-dimensional / three-dimensional simulation model of hydrogen internal combustion engine is established,and the performance of the whole machine is simulated.The simulation results are in good agreement with the experimental results,and the correctness of the simulation model is verified.Application of this model.We make the detailed analysis of the hydrogen internal combustion engine under the target conditions may occur the tempering phenomenon.Secondly,the injection timing is optimized under the condition,and the injection rate curve corresponding to the sprinkler hydrogen timing scheme is designed.The engine ventilation process and the hydrogen recovery process are simulated respectively.The average concentration of hydrogen in the inlet and the cylinder,and the reasonable range of the hydrogenation time.Finally,the valve overlap,the intake valve closing angle(IVC)and the exhaust valve closing angle(EVC)are optimized under this condition.We have designed two ways of valve timing.The results show that reducing the valve overlap can reduce the concentration of the mixture into the cylinder at the initial stage of the intake air,but increase the residual hydrogen concentration in the inlet.The inlet valve closing angle can reduce the residual hydrogen concentration in the inlet,but increase the overlap,which led to the early opening of the intake valve into the cylinder hydrogen concentration.Utilization the intake valve closing angle to reduce the valve overlap angle in advance,so that could obtain one of the optimum of valve timing to control backfire under this working condition.We changed the IVC by keeping the IVO as a constant,also obtained another valve timing to control backfire.