Study On Regeneration Parameter Optimization And Control Of4D83’s Diesel Particulate Filter

In recent years, people are increasingly concerned about air quality problems,especially the harm to the human body of PM2.5, and the mainly reason of PM2.5isthe emission of the car’s particulate. Studies have shown that soluble organiccomponents which are the part of particles can make greater harm to the humanbody even can lead to cancer, so we must restrict the emission of the particulate.There are three methods to control the mission of the particulate; fuel technology,internal engine control technology and after-treatment system, and the DieselOxidation Catalytic (DOC) assist Diesel Particulate Filter (DPF) system technologyis most widely used. Along with working of the DPF, soot deposited on the carriergradually, it will cause the power of engine down and rises the consumption of fuel,so it is very important to research the regeneration of the DPF.This article attached the nation863program’’ high pressure common rail dieselengine’, built the test bench of the4D83engine, simulated the regeneration processof the DPF. It mainly contain four parts,1) The test of temperature rise.2)Researched the characteristics of pressure drop.3) Simulated the process of sootlocation and regeneration of the DPF.4) Optimistic the regeneration parameter andcontrolled the temperature of regeneration process.Draw the ignition temperature curves of the DOC and the balance point temperaturecurve of the DPF,and concluded the balance temperature is383℃. Researched thetime and amount of after spraying for the influence of the DOC’s temperatureamplitude and rate. Researched the influence of the amount of soot loading, theexhaust temperature and the exhaust gas mass flow rate to the DPF’s pressure dropcharacteristics.Build the model of4D83car Diesel Particulate Filter with AVL-FIRE, and simulated the soot loading and regeneration process of the DPF. Inside the carrier, the sootloading stacked sequentially from back to front, and the loading of the wall stackedsequentially from the inside layer to the wall itself. In the regeneration process of theDPF, the soot is oxidized successively from front to back, and the peak temperaturegoes from front to back in sequence, the position of the maximum temperature pointis located near the center of the outlet support.By studying the influence of the amount of soot loading, the exhaust gas mass flow,the inlet temperature of DPF to the average temperature and local maximumtemperature of the regeneration process, and then to study the control strategy ofDPF regeneration process.Determined the working conditions of active regeneration is1800r/min-60Nm; forthe temperature elevation strategy, this article divided the engine condition intoseven different regions, different regions adopt different strategies to enhance theDOC inlet temperature and the DPF inlet temperature, test results show that most ofthe region are able to meet the required requirementsIn order to achieve one safely and controllable regeneration process, this papercombined with the mathematical model and speed-load-drop three MAP chart todetermine when to start regeneration. Finally, draw the flow chart of theregeneration control strategy of DPF and elaborated the control strategy ofregeneration from when to start regeneration to the end of the regeneration.