The module aims at providing students, who have chosen the “Propulsion system development” option, with applied knowledge regarding the design of the engine and of its control system, with particular reference to thermo-fluid dynamic and combustion aspects in relation to its structural design.

A deep knowledge of the various aspects and methodologies that are involved in the design and control of an engine and its components, with reference to operational, thermo-fluid dynamic and structural aspects. Capability of evaluating and optimizing the variables that condition the charge exchange processes (including induction system variable-geometry tuning), the distribution (also with reference to variable valve timing and actuation). Familiarity with: fuel injection and injection systems; in-engine fluid dynamics and combustion, their interaction and influence on fuel consumption and pollutant emissions; innovative combustion strategies and systems. Capability of analyzing thermo-fluid dynamic and combustion processes by means of zero-dimensional and multi-dimensional numerical models. Capability of identifying targets and define functional specifications of control systems in ICEs and to select the most suitable control strategy. Understanding of validation and rapid prototyping techinques for ICE control.

A good knowledge of engine architecture and operating features, as well as of sensor and actuators for automotive applications. The knowledge acquired through the course of Combustion Engine and their Application to Vehicle (01NIALO)

PART A - HIGHLY-EFFICIENT ICEs (36 h) - Combustion and injection processes in diesel engines - Combustion and injection processes in SI engines - Charge motion within intake and combustion systems - Introduction to computational fluid dynamics: conservation of mass and momentum. Reynolds Averaged Navier-Stokes equations. Turbulence modelling. k-epsilon - Practical combustion system design for diesel and SI engines - Supercharging and turbocharging: methods of power boosting; engine driven compressors and turbochargers with exhaust gas turbines; constant-pressure turbocharging and pulse turbocharging; matching compressor turbine wheel and engine for optimum efficiency; intercooler system. Numerical models and simulation of turbocharger and boosted engine performance. Control strategies. Evaluation of the discharge back-pressure effects on engine performance. Systems with high boosting levels. - Advanced combustion concepts: LTC, PCCI, RCCI - Diagnostics and modelling of combustion in ICEs PART B: ENGINE CONTROL SYSTEM AND MODEL-DRIVEN DESIGN OF ICE CONTROL (16 h) - Objectives and overview of engine management systems. Hints of the influence of engine control management on engine emissions. Diagnosis and recovery of engine management. Engine states and engine mode machines. Hints to self-adaptive strategies. - Engine control system: engine control function, modes and diagnostics. Examples of low-throughput models for model-based control. - Model-driven design of automotive applications: overview of model-driven techniques and supporting instruments; accurate and efficient modeling; validation techniques and rapid prototyping: model-in-the-loop, hardware-in-the-loop. PART C: LABORATORIES (28 h) - 0D/1D approaches for the simulation of ICE indicated cycle and performance: naturally aspirated and turbocharged engines, turbomatching - 2D/3D approaches for the simulation of fluid-dynamic and combustion in ICEs - Examples of application of model-in-the-loop, hardware-in-the-loop and rapid-prototyping techniques to engine control

Students have the opportunity to apply concepts learnt during lectures. Calculations on the computer will be carried out using zerodimensional, onedimensional and multidimensional codes for engine-like processes. Students can also carry out laboratory work on pressure measurement in the combustion chamber of gasoline and natural gas engines and its heat-release analysis. There is also the opportunity for students to carry out tests at the injector test bench in order to analyze injection parameters in common rail systems.

Didactic material such as notes diagrams and tables used during lectures and practical work are all uploaded on course website and available to students. The following reference book is suggested: -J.B. Heywood: Internal combustion engines fundamentals, McGraw-Hill, N.Y., 2nd edition, 2018. An electronic version of this textbook can be purchased and downloaded at McGrawHill bookstore (offer reserved to PoliTo student): https://create.mheducation.com/shop/#/catalog/details/?isbn=9781307412017

Modalità di esame: Prova orale obbligatoria;

Final examination consists in an oral test aimed at checking and verifying that the expected learning outcomes (detailed in the specific box above) have been achieved. The oral test is usually characterized by two questions, that can be about any of the topics discussed at lectures and/or laboratories. Additional questions can be asked if needed to complete the assessment. The average duration of the oral test is about 1.5 hour. For some cases, specifically identified by the professor and under his supervision only, it is possible to double-check didactic material during the oral test.

Modalità di esame: Prova orale obbligatoria;

Final examination consists in an oral test aimed at checking and verifying that the expected learning outcomes (detailed in the specific box above) have been achieved. The oral test is usually characterized by two questions, that can be about any of the topics discussed at lectures and/or laboratories. Additional questions can be asked if needed to complete the assessment. The average duration of the oral test is about 1.5 hour. For some cases, specifically identified by the professor and under his supervision only, it is possible to double-check didactic material during the oral test.