The Reseach Of Initial Intake Condition And Injection Timing Of Diesel Engine Based On The Theory Of Low Temperature High Density Combustion

Due to the diesel engine has a high thermal efficiency,and are better than thegasoline engine on the HC and CO emissions.However,reducing both NOxand Sootemissions of diesel engine are very difficult because the emissions have “trade-off"relationship.As the higher technology cost of the post-processor and limited byprocessor after conversion efficiency.Through the internal purification of internalcombustion engines have the potential to be the most effective and economical cleaningmeasures.Therefore proposes a new type of combustion,that is low temperature-highdensity combustion technology.By increasing air pressure,EGR and other measures toreduce fuel burn to reduce the emission of NOxand Soot.Possibility of achieving ultralow emission,not to use treatment devices after reprocessing or use only simplifieddevices,while reducing both emissions.Due to the traditional method of experimentalstudy on working process of diesel engine costs more,through computer simulation ofthree dimensional software for diesel engines is a good tool.the article elaborated theprinciple and development of low temperature-high density combustion,systematicallydescribes software calculation process control equation, turbulent combustion modeland emission models.Simulating the working process of4100vehicles dieselengines.First,build the model and verify the correctness of it,using the orthogonalexperimental method to build18experimental program respectively,At last,it isconclude each optimization scheme of the performance, fuel economy, emissions, andthe optimization scheme of both reduce carbon smoke and NOxemissions.