Research And Development Of Gasoline Particulate Filter

Compared with the traditional gasoline engine,the direct injection gasoline engine has excellent fuel economy and power.It is more and more popular in the current market,and its combustion method is more similar to that of the diesel engine.Compared with the traditional gasoline engine,the particulate matter in the exhaust gas is more and more.With the promulgation and implementation of the China-6 emission Regulations,not only has the limit of emission been increased,but also the requirements for the quality and quantity of particulate matter have been put forward.The traditional exhaust gas aftertreatment system can no longer meet the requirements of the regulations.The gasoline particulate filter is the most effective method for solving the problem.In this paper,the research of the gasoline particulate filter is carried out based on a certain research vehicle.Increasing the particle filter in the gasoline engine exhaust system,the first thing to consider is the problem of exhaust back pressure.In addition,the main purpose of adding a particle filter is to capture particulate matter in the exhaust gas,but when the trapping exceeds a certain amount,the soot particulate matter will also cause the problem of exhaust back pressure.Therefore,in order to avoid the problem of increased exhaust back pressure and reduced fuel economy,it is necessary to regenerate the GPF containing soot particulate matter.The amount of soot in the particulate filter cannot be disassembled and measured during driving.Therefore,in order to accurately determine the amount of carbon load in the GPF,it is necessary to establish a model to calculate and estimate.This article refers to the research method of the diesel particulate filter about the carbon load estimation model,the differential pressure method is introduced,with emphasis on the physical model and actual vehicle verification of the differential pressure method.In order to solve the problems of increased exhaust back pressure and reduced fuel economy caused by the particulate filter,regeneration is required after accurately estimating the model carbon load.This article introduces two modes of regeneration: active regeneration and passive regeneration.When the vehicle is actually driven,active regeneration and passive regeneration are not completely separated.After the regeneration conditions are met,the corresponding GPF regeneration is performed according to the environmental conditions.Finally,in the actual vehicle test,in order to verify the accuracy of the model,the calibration process and the three-high verification are adjusted.Take a combined form,that is,only passive regeneration(only deceleration and fuel cut),only active regeneration(only lean air-fuel ratio reduction)and comprehensive regeneration(both exist at the same time).The test method is designed and the test results are analyzed.The accuracy of the model meets the requirements for use.To meet the requirements of the regulations,the emission performance of the particle trap is tested in the vehicle emission laboratory.In the process of research and development,the model is built by logical analysis of the particle filter,and the model is calibrated through a large number of vehicle tests.Through multiple rounds of calibration and verification,the model prediction deviation meets the design requirements,and the regeneration process can work properly,there are no problems that affect the performance of the vehicle.