Analysis and Improvement of The Problem of Smaller Urea Nozzle Injection in a Car
In the early stage of the launch of the national six commercial vehicle products,a heavy vehicle of a main engine factory had a problem that the volume of urea nozzle injection volume bacame smaller,causing the engine fault light to be always on.Through the disassembly and inspection of the urea nozzle,it was found that there was a blockage inside it.In response to this problem,this paper puts forward an optimization and im-provement plan for the exhaust post-treatment system.Through the disassembly and eaxmination of urea nozzle structure,sampling urea soultion sample analysis,urea solution soaking aluminum plate and disassembly of u-rea box for electron microscopy analysis and other methods,it is found that black,black-brown sediments can be seen on the inner wall of the urea nozzle nozzle,which is mainly aluminum-containing.The oxides and other components are mixed,and finally the optimized and improved vehicle is tracked and verified.The test result show that the above phenomenon does not appear again in the vehicle,which verifies the feasibility of improve-ment measures and has certain reference significance for the actual design work in the future.
万方数据
维普
