Based The Intake Manifold And Valve Train Of The Engine Performance Optimization

With international oil prices soaring in recent years, most consumers have to changethe fuel efficient, a small displacement environmentally friendly vehicle. Upgradeoptimization according to the market demand characteristics of the current prototype,developed a small displacement gasoline engine, the engine uses a new manufacturingprocess, a modular design, lightweight design, specific cam profile with gas phase as well asthe intake manifold re optimize. Has certain advantages in power and economy. AVL BOOSTsoftware has played an important role on the engine concept design stage and performanceoptimization in the determination of the stage of basic design parameters. In this paper, theGuangzhou Automobile Group engines modeling, AVL BOOST software re optimize the camprofile, valve timing and intake manifold pipe.Gas distribution agencies is an important part of the engine, the engine performance issuperior, and often its with whether the design of the gas agency reasonably related.Traditional engine with gas phase is usually just optimized within a relatively narrow range ofconditions, and fixed the engine work, it is difficult to take into account the requirements ofdifferent conditions on the performance of the gas distribution. In order to obtain a betterperformance of the engine, it should be with gas phase varies as conditions change. Thedynamic effects of the intake manifold is also one of the effective measures to improve engineperformance. Therefore, in order to make the engine has good power performance in a widespeed range, and now more and more of the gasoline engine with a variable intake system andvariable valve timing system.The characteristics of the original engine, choose a rational cylinder combustion, heat transferand gas exchange model based the BOOST establish a numerical simulation model of engineperformance. Work process simulation under different conditions, different valve parametersconditions on the basis of the model, the VVT engine, the engine control strategy in differentconditions. Simultaneous analysis of the different conditions of intake and exhaust valvetiming, valve lift and intake system of the engine performance. Discussion of the valve timingin exhaust valve opening time, the intake valve closing timing, the valve overlap angle, theimpact on the engine performance of the valve lift and intake system parameter changes.Obtained by numerical simulation, switchable high or low speed cam cam VVT mechanismunder optimal valve timing.One dimensional engine flow process simulation software BOOST to build computing model,its variable intake manifold optimization, and on this basis to investigate the feasibility of using the variable valve timing system to further improve the performance of which engine.The main contents:1) an EFI Gasoline flow process simulation analysis, and compared with the experimentalvalues, and to verify the correctness of the model.2) In order to further improve the performance of the engine, the use of commercial softwareBoost, established on the basis of the engine variable intake calculation model of the intakesystem, the use of the gas within the dynamic effect theory, by the flow of gas inside theintake system The study of the properties of structural optimization and design of theproposed optimization program. Finalized for this engine’s variable intake manifold structureoptimization program, pointed out the direction for the engine retrofit design.3) At the same time, but also to explore the feasibility of using variable valve timing systemto further improve the performance of which engine, and variable valve timing system flowcharacteristics analysis using EXCITE TD establish with The valve train dynamic model, thedesign of the cam line dynamics analysis. Thus achieving variable valve program provides thedesign basis.