Optimization Of Injection Parameters Based On Internal DPF Regeneration Control Strategy

Diesel engine’s main exhaust pollution is NOx and Soot,in which the control technology of NOxhas been relatively perfect.The main control technology for soot is fuel technology,internal engine control technology and post-processing technology.For post-processing technology,the diesel oxidation catalyst plus diesel particulate filter are most widely used.When a certain amount of particulates are trapped in DPF will cause the diesel engine’s backpressure to rise,the power to drop and fuel consumption to riseThere are many DPF regeneration technology.This article will take the In-cylinder injection regeneration technology,because this type technology does not add any auxiliary system,the space layout is small and easy to control.When the gas temperature more than 500℃ the particulate can be burned,while the engine exhaust temperature just between 300～500℃.So most of the conditions need to use DOC to improve DOC export temperature.The impact of fuel injection parameters,EGR rate and throttle opening angle onthe DOC inlet temperature and outlet temperature are analyzed by establishing one-dimensional simulation model.At the same time,analyze the effects of different carbon loading on the performance of diesel engine,and the regeneration efficiency.Combustion law of 6g/L carbon load is that the order of combustion from the front to the back and after a while the burning sequence is reversedDPF regeneration needs to change the fuel injection MAP,to make sure DPF inlet temperature reaches the particle ignition temperature.Traditional gantry calibration and repeated tests will consume a lot of manpower and resources.Based on the experimental design method,the parameters of DPF inlet temperature are optimized and get the optimized MAP.Finally,the total cyclic fuel injection is reduced by 0.26mg,which provides directional guidance for bench test.