Abstract:Fuel reforming for hydrogen production is a method that the fuel generates hydrogen through complex chemical by utilizing catalyst. This article describes the advantages and disadvanta- ges of hydrogen fuels relative to other fuels and the study status of fuel reforming for hydrogen pro- duction, discusses the advantages of mixed hydrogen fuel engine compared to conventional engines and proposes that reforming is an important trend in the future engine development.

Abstract:In order to improve the performance of diesel particulate filter(DPF)and achieve safety regeneration of DPF,the particle deposition mechanism and the influence of DPF inlet flow rate,particle size,ash deposition amount,filter structure,etc.on the distribution characteristics of particle deposition in DPF are analyzed.The estimation method of carbon deposition in DPF and the influencing factors of DPF regeneration performance are summarized.Through the study of the temperature field of DPF idle regeneration,the upper limit of carbon accumulation in DPF safe regeneration is 11 g/L.In future research,the impact of random vibration on particle deposition and regeneration processes should be considered.This study can provide reference for optimizing the structure and regeneration performance of DPF.

Abstract:The paper gives calculation on the inject spray and combustion process in the combustion chamber of the direct injection diesel engine using the CFD software , analyze the differences of cylinder - in 3D flow distribution and NOx emission and the calculation results in different inject angle. The results shows that air in the combustion chamber concave gets to be consumed much worse when the inject angle increases and the high temperature zone is much close to the cylinder wall and cylinder head surface. Reduction of inject spray angle causes increase of NOx emission and injector thermal load.

Abstract:In order to study the performance of noise,vibration,harshness(NVH)of an electric commercial vehicle,the finite element model of cab and acoustic cavity are established by using the finite element software,and the acoustic cavity modal analysis is carried out.Take the mounting point of the left and right front shock absorbers of the chassis as the excitation point,the noise transfer function(NTF)analysis is performed on the right ear of the driver and compared with the vehicle standard sound pressure level.The results show that the mode shape distribution of the cavity is uniform and reasonable,and the natural frequencies of the cavity mode avoid the natural frequency of 100.8 Hz of the vehicle to prevent resonance,the model response point sound pressure level is less than 65 dB,which meets the NVH performance standard.

Abstract:The structure of the electromagnetic fuel pump of the vehicle heater and principle of pump oil were introduced in the paper. The factors of oil pump installation angle, pump oil frequency and so on which influenced fuel supply characteristics of the electromagnetic pump were tested and analyzed. This paper proposed a conception as volume of oil shortage and considered that the volume of oil shortage and throttling action mainly affected the amount of pump oil which was also influenced by the speed of the plunger. The speed of plunger also had relationship with pump oil frequency and the gravity, and the effective gravity which operated actually on plunger also had relationship with electromagnetic pump installation angle.

Abstract:In order to solve the problem of large errors in state of charge(SOC)estimation by Kalman filter for lithium-ion battery,a model of a lithium-ion battery second-order resistance capacitance(RC)circuit is built based on extended Kalman filter(EKF)algorithm,which uses Taylor series to expand a nonlinear function linearly.The SOC curves of dynamic stress test,city cycle,mixed pulse power and pulse conditions are estimated by MATLAB simulation,the results are compared with the SOC curve estimated by ampere integration method.The results show that the maximum error of dynamic stress measurement is 0.015,the mean square deviation of the four lithium-ion battery is less than 0.003 2,the error distribution is more stable and the curve is more reliable,the EKF algorithm is more effective and accurate in estimating SOC of lithium-ion battery.

Abstract:In order to evaluate the accuracy of different turbulence models and droplet breakup models in the simulation of high-pressure spray atomization process,based on Euler-Lagrange method and took the Spray A n-dodecane spray experiment of ECN research group of Sandia National Laboratory as a reference,numerical simulation research on high-pressure spray process is carried out.The numerical results obtained by using different turbulence models and droplet breakup models show that the numerical simulation results of the standard k-ε and realizable k-ε models in the turbulence model are closer to the experimental results when the numerical simulation of high-pressure spray atomization process is carried out.The liquid-phase penetration distance can be predicted more accurately by standard k-ε model,while the gas-phase penetration distance can be predicted more accurately by realizable k-ε model.The simulation results of KH-RT model and wave model are close to the experimental results,but the accuracy of the simulation results of KH-RT model is better.