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Risorsa bibliografica obbligatoria
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Scheda Riassuntiva
Anno Accademico 2019/2020
Scuola Scuola di Ingegneria Industriale e dell'Informazione
Insegnamento 054364 - INTERNAL COMBUSTION ENGINES
Docente D'Errico Gianluca
Cfu 10.00 Tipo insegnamento Monodisciplinare

Corso di Studi Codice Piano di Studio preventivamente approvato Da (compreso) A (escluso) Insegnamento
Ing Ind - Inf (Mag.)(ord. 270) - BV (483) MECHANICAL ENGINEERING - INGEGNERIA MECCANICA*AZZZZ054364 - INTERNAL COMBUSTION ENGINES
054363 - INTERNAL COMBUSTION ENGINES FOR AUTOMOTIVE APPLICATIONS

Obiettivi dell'insegnamento

The course aims to prepare students with an extensive know-how about principles of operation of internal combustion engines and to provide the skills required to develop and manage engineering projects involving selection, operation, design and optimization of i.c. engines.

Particular attention is paid to fluid dynamics, combustion, energy and environmental aspects of engines used in both transportation and off-highway sectors (10 cfu only).


Risultati di apprendimento attesi

Lectures will provide the basis for basic knowledge to understand all the key aspects involved in the design of conventional and innovative i.c engines used in both transportation and off-road sectors.

After completing the course students will be able to:

• define and evaluate all relevant parameters of an i.c. engine which define its architecture and operation for automotive and off-road (10 cfu only) applications
• master the fundamental concepts of the gas exchange process and charge motions in engines and apply them for design and optimization purposes
• know the fundamentals of fluid dynamic engine modelling (10 cfu only)
• assess the advantages of turbocharged versus natural aspirated engines and propose the best configuration depending on the field of application.
• define the requirements and suggest the preferred layout for the fuel injection system in SI and CI engines
• classify on the chemical and physical point of view the conventional and alternative fuels for engines (10 cfu only)
• describe the combustion in spark ignition and compression ignition engines and assess the influences of the most important operating parameters on the engine performance
• know deeply the mechanisms of pollutant emission formation and in-cylinder and after-treatment solutions to reduce the environmental impact and comply with the vehicle exhaust emission testing procedures
• demonstrate an understanding of challenges related to future technological developments of i.c. engine for powertrain from the fluid-dynamic, chemical and thermal point of view
• have a good background in control of gas dynamic noise and select and/or design the optimal silencers for a given engine (10 cfu only)

After completing the laboratories students will:

• have a good practical familiarity with the main engine components
• have knowledge about the potentialities and field of application of using a simulation tool for engine performance and emissions
• have a good familiarity with the use of 1D fluid dynamic tools for a preliminary engine design (10 cfu only)


Argomenti trattati

The course is organized in several modules which cover the different topics, whose study offer the students a complete knowledge about the design and operation of internal combustion engines and their application in on-road vehicles

Fundamentals of IC Engines
Fundamentals of IC engine thermodynamic cycles. Classification of IC engines. Performance indexes (thermal efficiency, fuel consumption, reliability, drivability), engine maps.
Laboratory with hands on experience on engines. (10 cfu only)

Stationary and Nonroad engines (10 cfu only)
Classification and characteristics of stationary and nonroad engines. Thermal efficiency and development roadmap.

Gas Exchange Process
Inlet and exhaust processes in the four-stroke engine. Quasi-steady and dynamic effects on cylinder charging. Flow through the valves: flow rates and discharge coefficients. Valve flow areas, optimum lifts and timings. Two-stroke engines.

Fluid dynamic engine modelling (10 cfu only)
Hierarchy of computational models for engine simulation. Fundamental equations (1D) in conservative form. Numerical methods. Examples of application.
Numerical laboratory of engine gas dynamics

Turbocharging of IC Engines
Supercharging and turbochargers. Constant pressure and pulse turbocharging. Wastegate valves and variable geometry turbines. Dual stage turbocharging configurations. Requirements for powertrain and transient response of the turbocharger.

Unsteady Flows in the Pipes
Effects of unsteady flows and pressure waves in the pipes. Optimum design of the intake and exhaust pipe systems to exploit wave effects
Numerical laboratory of engine gas dynamics (10 cfu only)

Fuels for engines (10 cfu only)
Properties of conventional (gasoline, diesel) and alternative fuels (bio-ethanol, biodiesel, gaseous fuels, synthetic fuels). Knock rating of fuels.

Injection Systems for SI and Diesel engines
Fuel injection systems for SI and Diesel engines. Spray atomization and penetration. Common rail systems.

In-Cylinder Turbulent Flow
Turbulent air motion: swirl, squish and tumble.


Ignition systems for SI engines (10 cfu only)
Fundamental of ignition systems for SI engines. Spark plugs characteristics. Turbulent jet ignition.

Combustion in SI Engines
Normal and abnormal combustion processes in spark ignition engines.

Combustion in CI Engines
Non-premixed combustion, flame structure, ignition delay. Innovative low temperature combustion modes.

Emission Formation
Pollutant formation mechanisms and emission control strategies. Aftertreatment systems: three-way catalyst, Diesel particulate filter, Selective Catalytic Reduction catalyst with urea injection. Vehicle Exhaust Emission Testing Procedures.

Innovative Powertrain Solutions
Innovative IC engines for eco-sustainable mobility: integration in mild and full hybrid vehicles, alternative combustion modes.

 


Prerequisiti

Notions of Thermodynamics, Chemistry and Fluid Machines of the first level degree are required.


Modalità di valutazione

Evaluations at all exam dates will consist of:

  • a first part with 10 multiple-choice questions on fundamental theoretical topics
  • a second part with open theoretical and numerical questions
  • a mandatory oral to complete the exam only for the highest marks (>28)

Students are given the possibility to take a mid-term exam that allows the exemption of the first part of the course at the first final exam date only. Hence in this occasion, students who passed (mark>18/30) the mid-term exam will be able to choose about taking an exam on the second part of the course or on the entire course if they intend to refuse the evaluation they received in the mid-term. From the second exam date, the mid-term results are not considered valid anymore.

The student during the examination must demonstrate:

  • to to have the ability to organize the knowledge of the different topics of the course and the interrelations existing between them;
  • to have the capacity for critical reasoning on the theoretical concepts that led to the definition of the different technological solutions which have been studied;
  • to be able to quantitatively determine the main geometrical and operational parameters which are asked in the proposed numerical exercises;
  • to describe each topic with good technical language properties and adequate synthesis and linearity.

Bibliografia
Risorsa bibliografica obbligatoriaGiancarlo Ferrari, Internal Combustion Engines, Editore: Esculapio, Anno edizione: 2014, ISBN: 9788874887651

Forme didattiche
Tipo Forma Didattica Ore di attività svolte in aula
(hh:mm)
Ore di studio autonome
(hh:mm)
Lezione
70:00
105:00
Esercitazione
15:00
22:30
Laboratorio Informatico
15:00
22:30
Laboratorio Sperimentale
0:00
0:00
Laboratorio Di Progetto
0:00
0:00
Totale 100:00 150:00

Informazioni in lingua inglese a supporto dell'internazionalizzazione
Insegnamento erogato in lingua Inglese
Disponibilità di materiale didattico/slides in lingua inglese
Disponibilità di libri di testo/bibliografia in lingua inglese
Possibilità di sostenere l'esame in lingua inglese
Disponibilità di supporto didattico in lingua inglese
schedaincarico v. 1.6.5 / 1.6.5
Area Servizi ICT
19/01/2021