Internal Combustion Engines

At the level of Thermodynamics, Fluid Mechanics and Heat Transfer.

Classes are divided into 3 parts:
a) Theoretical: exposition, by the teacher
b) Theoretical – practices: They include the exercises resolution and the study of selected prototypes;
c) Practical works in laboratory: Laboratorial classes involve experiences with engines and test hardware. These include: Compression and tight tests; Electrical / electronic injection and ignition control. Motor starting. Oscillograms. Power balance between cylinders. Escape gases. Engine curves characteristics determination.
Assessment:
(A) Two tests during the semester (minimum of 80% assiduity and >= 8,5 values in a 0-20 scale). There is also the option of accomplishment final written exam (also >= 8,5 values). Approval in (B) laboratorial works is obligatory (>= 10 values in a 0-20 scale). The final mark is (0,75*A+0,25*B). Where (B) is the mark of laboratorial part. Includes 2 cmponents: B.1) Practical works (30%*B); B.2) Presentation and discussion of reports (groups<= 6 students) (70%*B).

Objectives:
1-To understand the constructive details and working principles; capacity to install and to operate reciprocating engines; To intervene, through simple projects, in the power management, consumptions mitigation and environmental impacts; to know to answer to the maintenance needs and repair; to know to select the different engine components and systems; to know to accompany the technological evolutions.
2- To know to analyze the engine performance and to study its characteristics.
Competences:
1- To know to accomplish mensurations, to instrument and to control the operation of internal combustion engines.
2- To have capacity to install, to operate and to make internal combustion engines maintenance and repair.
3- To know to apply techniques of fault detection in internal combustion engines.
4- Accomplishment of laboratory works:
a) Compression and tight tests. b) Engines rehearsals and faults diagnosis. c) Engine testing on dynamometer bench.

PART I – ENGINES THEORY
Engines function and operating principles.
Ideal gas cycles of internal combustion engines.
Fuels, combustion, working fluid and emissions.
Engine friction, lubrication and lubricants.
Real cycles. Pressure diagrams.
Geometric and performance parameters. Engine energy balance.
Four stroke engines: Spark ignition engines and compression ignition engines.
Two stroke engines.
Supercharging and turbo-charging.
Ecological parameters and anti-pollution systems.
Engines tests in dynamometric bench.
PART II – ENGINES DESCRIPTION / THEORETICAL- PRACTICAL EXERCISES
Practical description of engines. Structure and construction of engines.
Distribution system of working fluid.
SI fuel feeding and ignition systems.
CI fuel feeding systems.
Engine Auxiliary Systems: Engines cooling systems; lubrication systems; starting and charge systems.
Theoretical-practical exercises resolution.
PARTE III – ENGINES LABORATORIES
Practical works in laboratory.

NAO