Turbocharged And Intercooled Diesel Engine Modeling And Simulation Based On MATLAB/Simulink

With the development ofthe automotive industry, automotive engine control has entered a control model based on mathematic. High-precision numerical simulation engine and engine control system can effectively shorten the development cycle, significantly reducing development costs. This requires the establishment of a representative detailed and accurate model of the engine.The model can be used in the virtual vehicle model to numerical simulation, and optimization to achieve matching vehicle.Firstly, access to a large number of domestic and foreign literature, summarized the EGR turbocharged diesel engine inlet and exhaust systems research status, and related physical and mathematical models and simulation models. On MATLAB/ SIMULINK software platform, built a 2.0T EGR turbocharged diesel engine simulation model of the machine,the model includes air filter,turbocharger, intercooler, intake manifold, the working process on cylinder, EGR, muffler and other sub-models. Simulation results and comparison of experimental values show that the degree of agreement between them is good.Secondly, the whole model with EGR sub-model simulation, comparative analysis of different conditions of engine speed, intake air mass flow characteristics and fuel consumption rate; at the same time, a comparative analysis of the model under different conditions and with EGR Comparative analysis of the proposed model and conventional (not taking into account exhaust subsystem) model in different conditions cylinder engine speed and intake air temperature, etc;when no EGR engine speed variation model, the pressure and temperature of the compressor, etc. differences in parameters.Then, the diesel model is embedded into the virtual vehicle model, perfect match the corresponding signal, the numerical simulation, and vehicle speed, engine speed, brake pedal position, throttle pedal position and other signals were analyzed. The results show that the diesel model and virtual vehicle model matching is able to correct the vehicle's response relationship between the various parts, providing help for the design and optimization of the virtual vehicle.