34957 - Internal Combustion Engines (2nd cycle)

Course Unit Page

SDGs

This teaching activity contributes to the achievement of the Sustainable Development Goals of the UN 2030 Agenda.

Affordable and clean energy Industry, innovation and infrastructure Responsible consumption and production Climate Action

Academic Year 2021/2022

Learning outcomes

The student learns the specific issues relating to the operation and modeling of internal combustion engines, bothspark and compression ignition.

Course contents

Zero-dimensional Thermodynamic model for ICE

Development of a zero-dimensional thermodynamic model for an internal combustion engine: evaluation of the trend of the main termo-dynamic quantities inside the cycle and of the performance in terms of torque, power, cylinder filling and fuel compsunction. Characteristic curves at full and partial load: comparison between spark ignition and spontaneous ignition engines. Reduction of the zero-dimensional model to obtain a real-time simulator of the engine behaviour.

Fuel injection system for MCI

Gasoline feeding in spark-ignition engines: an outline on carburettor systems, architecture of the electronic injection systems and the speed-density, (a,N) and MAF methodologies for the estimation of the air mass required by the engine. Air fuel ratio close loop control by means of the lambda sensor. Stoichiometric air fuel ratio control during throttle transient. Compensation of the fuel deposition on the ducts wall: the fluid film Aquino model. The Drive-by-Wire systems. Development in Matlab Simulink of air-fuel ratio control function for a gosoline engine.

Knock and emission control.

Compression ignition engines

Evolution of the injection system for compression ignition engines (single injection pump, single pump with distributor, injector unit and common rail systems). Emission control in compression ignition engines.

Two stroke engines and supercharging

Two stroke engines and dynamic and volumetric supercharging.
Stratified or homogeneous charge direct injection spark ignition engines: performance comparison. Un-throttled spark ignition engines.
Outline on  gasoline and Diesel homogeneous combustion compression ignition engines (HCCI).

Idle and cruise control

Cruise control in a vehicle and idle control in an engine: development of the related function in Matlab Simulink.

Readings/Bibliography

The didactic material will be give to the studentby the teacher

Teaching methods

The lessons are frontal in the classroom. The teacher, replacing the traditional blackboard, uses a tablet connected to the projector to develop the concepts and to show the supporting teaching material. At the end of the lesson the teacher makes available the material shown in a pdf file, downloadable from IOL platform.

Attendance is strongly recommended for better learning of concepts and notions, but does not affect the final evaluation process.

Assessment methods

The assessment methods consist of an oral part lasting about 45 minutes, during which the student must answer two questions, randomly extracted from a list of about eighty questions covering the entire program, list given at the last lesson of the course in the same dropbox folder that collects all the material presented during the lessons.

During the exam, with regard to internal combustion engines, their components and functions, is evaluated the student's ability to:

- use the thermodynamic instruments correctly;

- describe their operation;

- theoretically justify their architecture;

- represent their geometry with a free hand sketch;

- evaluate their performance;

The evaluation, expressed in thirtieths, will be higher the more the student is:

- autonomous in articulating responses to the two questions;

- exhaustive in explaining the arguments;

- precise in representing the functionality of the free-hand sketches.

The exam dates are comunicated in advance through the AlmaEsami web platform of the University of Bologna. It is possible to enroll to the exam from 7 to 2 days before the exam date. At the time of the exam the student must carry an identification document.

Teaching tools

In the course will be shown in detail the development of a zero-dimensional thermodynamic engine simulation code, from which a real time simulation code will be extracted and utilized for the description of the basic functions of injection control in an SI engine.

The projection from a laptop computer will be used for a description and analysis of results obtained by the models developed.

Office hours

See the website of Davide Moro