The results show that the heat transfer in intake manifold and cylinder has obvious effects on the volume efficiency , while the pipe friction coefficients and bent pressure loss coefficients have less effect 结果表明，进气管和气缸的传热对充气效率的影响较显著，而管道摩擦系数和弯管压力损失系数对充气效率的影响较小。
Moreover , the effects of the resonant intake manifold various construction parameters on volumetric efficiency are analyzed in this paper , and the best project is provided for the model 4108q diesel engine 文中还计算分析了谐振进气系统各结构参数对充量系数0的影响规律，为lf4108q型柴油机利用谐振进气系统改善其性能，提供一个最佳方案。
By pre - mixed methanol through intake manifold on a diesel engine car , the fuel economical performance and acceleration performance are researched , and an electronic control system is developed to control the injecting quantity of pre - mixed methanol 摘要研究了进气预混甲醇柴油汽车的经济性性能和加速性能，并开发了控制甲醇喷射的电控装置。
For intake system , adopting the resonant intake manifold construction , make use of the intake motive effect to increase volumetric efficiency ; adopt measure to prevent the heat transmit between intake pipe and exhaust pipe , lower the intake air temperature to increase volumetric efficiency 对于进气系统，采取谐振进气的结构措施，利用进气动力效应来提高进气充量；采取进、排气管隔热措施，降低进气温度来提高进气充量。
The experimental results show that methanol can replace 35 . 1 % diesel by injecting methanol into intake manifold to form even mixture of methanol and air so as to be fired by diesel in cylinders , and the acceleration capability of the car increases obviously and fuel economical performance also improves 试验结果表明，利用进气管喷射甲醇与空气形成均匀的预混合气，在气缸内由柴油引燃的方法，能使甲醇对柴油的替代率达到35 . 1 % ，经济性有所改善，而汽车的加速性能有较显著地提高。
The disposal of the valves and intake manifold structure not only affect fresh air charge but airflow in the cylinder , which immediately affect combustion efficiency and the performance of dynamic , economic and emission . the structure of the air distributing institution has influence on charging efficiency and the noise of engine . the combustion chamber affects compression scale which has great influence on dynamical performance ; f / v which affects the exhaust of hc ; squash area and clearance which have great influence on the intensity of squash 气缸盖的气门排列方式与气道结构形式影响进气充量和气流在气缸内的运动，从而影响了燃烧效率，对整机的动力性、经济性以及排放都有直接的影响；配气机构的形式影响充气系数和整机噪声等；缸盖燃烧室决定了影响整机动力性能的压缩比，影响hc排放的f / v和对挤流起决定性作用的挤气面积以及挤气间隙，所以燃烧室对整机动力性、经济性、排放等都有重要的影响；气缸盖是整机热负荷与热应力最大的部件之一，热负荷过高将不利于发动机寿命以及可靠性的提高。
The factors that have effect on the car ' s emission such as cleaning inside engine , size of three - way catalytic converter and leakage of exhaust system etc have been tested and analyzed , and some related parameters are determined . in order to ensure that the emission meets the requirements of the euro ii standard at one time , to pass the examination of 80000km durability , and to achieve excellent performance indicator while assuring the emission requirements , the design of intake manifold and camshaft profile is optimized , the test of engine performance and car ' s emission and environment performance have been conducted . through comparison by test , it is shown that the carburetor engine after retrofitting to electronic fuel injection engine has achieved good level in terms of emission and performance , and has been upgraded to the same level as the engine of japan mitsubishi and suzuki 为了满足国家环保法规不断提高的要求，本文对化油器式发动机改造成电控燃油喷射式发动机进行了研究与开发；确定了工程方案和开发目标；对机内净化、三元催化器体积、排气系统漏气等对整车排放的影响进行了试验和分析，确定了相关参数；为了确保对整车排放的影响进行了试验和分析，确定了相关参数；为了确保排放一次通过欧标准，并完成8万公里耐久性考核，在确保排放的同时达到良好的性能指标，对进气歧管、凸轮轴型面的设计进行了优化；并进行了发动机性能测试，整车排入测试和环境性能测试。
The effects are noticeable . the article has offered reliable foundation of theory for designing resonant intake manifold . it is certain how we apply computers to simulate intake process of multi - cylinder engine and realize the comparison quickly between many objects so as to optimize the resonant intake manifold for multi - cylinder engine and reduce the amount of working in experiments 本文为设计谐振进气系统提供了可靠的理论依据，并对如何利用计算机来模拟多缸机的进气过程，实现快速多方案的比较，从而优化多缸机的谐振进气系统，减少台架试验工作量，具有一定的指导意义。
The article elaborates the operation principle and application of the resonant intake manifold , and summarizes development on its pressure wave action simulation . its mathematical model is set up as well . in order to calculate unsteady flow in it for multi - cylinder engine , the method of characteristics and the two step lax - wendroff method are integrated to program in visual basic 本文阐述了谐振进气系统的工作原理及应用，综述了谐振进气系统压力波模拟计算方法的发展，建立了谐振进气系统的数学模型，并结合特征线法和lw2差分法，编制了计算多缸机非等熵不定常进气流动的visuaibasic程序，得出的计算结果0与实测0误差小于2 。
The results derived from comparison experiments indicate that various performances of the diesel engine adopting the best project is better than those of the previous intake manifold . especially at the rating , the volumetric efficiency and power increases by about 5 % , exhaust temperature decreases by 50 , 4 . 3g / kw . h fuel consumption is reduced , o . srb smoke emission is cut down 试验表明：该方案与原机进气系统方案相比，其各项性能指标均有不同程度的改进：在标定点的充量系数和功率提高了将近5 ，排温下降了50 [ ] ，燃油消耗率减少了4 . 3 [ g kw
