Unit INTERNAL COMBUSTION ENGINES
- Course
- Industrial engineering
- Study-unit Code
- 70923206
- Curriculum
- In all curricula
- Teacher
- Lucio Postrioti
- Teachers
-
- Lucio Postrioti
- Hours
- 56 ore - Lucio Postrioti
- CFU
- 7
- Course Regulation
- Coorte 2021
- Offered
- 2022/23
- Learning activities
- Caratterizzante
- Area
- Ingegneria meccanica
- Academic discipline
- ING-IND/08
- Type of study-unit
- Obbligatorio (Required)
- Type of learning activities
- Attività formativa monodisciplinare
- Language of instruction
- Italian
- Contents
- Introduction to internal combustion engines: definition, field of use and main system parameters.
Air charge in internal combustion engines: design criteria.
Fuel supply systems for Diesel and spark ignited engines: PFI, GDI and Diesel Commn-rail systems.
Combustion process in Diesel and Spark Ignited engines.
Pollutant formation and control in internal combustion engines.
Hybrid vehicles. - Reference texts
- G. Ferrari - Motori a Combustione Interna - Esculapio
J. B. Heywood- Internal combustion engines - McGraw-Hill - Educational objectives
- The main goal of the present course is giving the Student a basic knowledge about functional design criteria for internal combustion engines in terms of fluid-dynamics, combustion and emission control.
- Prerequisites
- The Student is supposed to have an adequate knowledge of basic thermodynamics and classical thermodynamic cycles used as reference for internal combustion engine. This knoledge base is normally gained during the course "Macchine".
- Teaching methods
- Face-to-face lessons
- Other information
- n.a.
- Learning verification modality
- Oral examination or essay written questions.
- Extended program
- Classification and main parameters for internal combustion engine
Air supply systems for two stroke and four stroke engines: volumetric efficiency, quasi-steady and dynamic effects. Inlet and exhaust valve discharge coefficients. Typical design schemes for valve-seat systems, effect of the main operating parameters on volumetric efficiecy. Scaveging for two stroke engines, exhaust systems design.
Fluyd-dynamics for intake and exhaust systems, inertial and wave effects. Filling-emptying and gas-dynamic models. Supercharging systems: constant pressure and pulse pressure systems. Models for the turbocharger-engine matching.
Fuels for internal combustion engines: knock resistance and cetane number.
Fuel supply systems for spark ignited engines: carburator basics; indirect injection systems (PFI); direct injection systems (GDI). Closed-loop mixture control strategies.
Fuel supply systems for Diesel engines: spray development basics and requirements for the Diesel combustion process. Conventional injection systems and common-rail, electronic controlled systems.
Swilr, squish and tumble motions to promote the combustion chamber turbulence.
Combustion process for the sprak ignited engine: normal combustion, auto-ignition and detonation. Heat release rate evaluation.
Combustion process in Diesel engines: ignition delay, pre-mixed combustion and diffusion controlled combustion. Heat release rate evaluation.
Pollutants formation and control: basic mechanisms for NOx, carbon monoxide, unburnt hydrocarbons and particulte matter. Emission measurment. After-treatment systems for emission control.
Hybrid vehicles design basics.