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Thermal Engines

Code:

LEM21118

Sigla:

MT

Áreas Científicas
Classificação	Área Científica
OFICIAL	Applied Thermodynamics

Ocorrência: 2021/2022 - 1S

Ativa?	Yes
Unidade Responsável:	Departamento de Engenharia Mecânica
Curso/CE Responsável:

Ciclos de Estudo/Cursos

Sigla	Nº de Estudantes	Plano de Estudos	Anos Curriculares	Créditos UCN	Créditos ECTS	Horas de Contacto	Horas Totais
EM	53	Plano de Estudos	2	-	6	75	162

Língua de trabalho

Portuguese

Objetivos

This course aims to provide students with theoretical and practical knowledge about the operation, constitution and repair of Internal Combustion Engines (ICE) and their different organs and systems, through the theoretical knowledge transmitted and direct contact with the equipment and constituent parts . It is also intended that students know and be able to follow the technological evolutions related to Internal Combustion Engines. On the other hand, it is intended that the review of theoretical knowledge acquired by the student in other subjects throughout the course is carried out gradually, using this knowledge as a basis for explaining the functioning and constitution of the ICE and its organs.

Resultados de aprendizagem e competências

The course aims to equip students with theoretical and practical knowledge on the operation, constitution and
repair of Internal Combustion Engines (ICE) and its various organs and systems through the transmission of
theoretical knowledge and direct contact with the equipment and constituent parts. It is also intended that
students know and be able to keep up with technological developments relating to Internal Combustion
Engines. Moreover it is intended that the revision of the theoretical knowledge acquired by the student in other
subjects over the course takes place gradually, using this knowledge as a basis for explaining the operation
and constitution of MCI and its organs.

Modo de trabalho

Presencial

Pré-requisitos (conhecimentos prévios) e co-requisitos (conhecimentos simultâneos)

As prerequisites, for students to be successful at UC, they must have completed the UC courses with a positive assessment:
Mechanics, Thermodynamics, Fluid Mechanics, Heat and Mass Transmission, Materials. They should also have notions of chemistry and combustion

Programa

Syllabus
I - ENGINE THEORY (34 h)

1. Introduction. Function of Internal Combustion Engines. Evolution and types of existing combustion engines. (2 h)

2. Thermodynamic theoretical principles of operation of thermal machines (cycles
theoretical). (8h)

3. Combustion (4 h)
• Fuels,
• Air/fuel mixture,
• Elementary combustion reactions, and combustion products.


4. Internal Combustion Engines (ICE -Real cycles (10 h)
• Gas distribution process
• Compression process
• Fuel injection and spraying process (on different types of engines)
• Mixture formation process (in different types of Engines)
• Combustion process and heat release
• Expansion process

5. Motor duty cycle parameters. Characteristic curves (6 h)
• Indicated parameters
• Mechanical losses
•Effective parameters
•Technical-economic engine features
• Motor thermal balance
• Thermal loads of parts and their thermal stress

6. Ecological parameters of engine work. (4 h)
• Formation of exhaust gas pollutants
• Main methods and technologies for reducing pollutants and smoke
•Acoustic engine parameters
• Main methods of reducing engine noise

II - GENERAL CONSTRUCTION (STRUCTURE) OF THE ENGINES (31 h)

1. Main characteristics and particularities of the engines (1 h)

2. Crank and connecting rod mechanism (4 h)
•Engine block
• Group of cylinders and pistons
• Crank and connecting rod group
• Engine balancing (general notions)
• Defects in the crank and connecting rod mechanism

3. Gas distribution mechanism (3 h)
• Schema and operation of different gas distribution mechanisms
• Decompression mechanism
• Faults in the gas distribution mechanism and their resolution

4. Feeding system (6 h)
• General notions about the feeding system
• Gasoline engine power systems
• Diesel engine power systems
• Power system malfunctions and their resolution

5. Cooling system (4 h)
• Classification of cooling systems
• Structure of the components of the liquid cooling system
• Structure of air cooling system components
• Technical maintenance, cooling system malfunctions and their resolution

6. Lubrication system (4 h)
• General structure and operating principles
• Structure of the component parts of the lubrication system
Technical Maintenance, Lubrication System malfunctions and their resolution

7. Start system (4h)
•Components of the boot system
•Start-up device malfunctions and their resolution
• Engine starting methods

8. Engine management (4h)
•Operating principles
•Electronic control unit
•Sensors and actuators

Bibliografia Obrigatória

Alexandre Magrinho; Folhas de apoio à UC
Jorge Manuel Mateus Martins; Motores de combustão interna, Publindustria, 2005. ISBN: 972-98726-8-6

Métodos de ensino e atividades de aprendizagem

Theoretical classes:

Use of the expository interrogative method, leading students to reach conclusions.

Practical classes - laboratory:
Students have direct contact with the laboratory equipment, using the active method of discovery, through observation and detailed description of the organs and their functioning, using, for this purpose, whenever necessary, the assembly / disassembly of different Engine systems and mechanisms and its commissioning. Other available resources (literature, Internet, etc.) are also used to prepare the reports to search for information, namely on recent and developing technologies.

Tipo de avaliação

Distributed evaluation with final exam

Componentes de Avaliação

Designation	Peso (%)
Teste	60,00
Trabalho laboratorial	40,00
Total:	100,00

Componentes de Ocupação

Designation	Tempo (Horas)
Estudo autónomo	60,00
Frequência das aulas	75,00
Trabalho laboratorial	30,00
Total:	165,00

Obtenção de frequência

The course has two assessment components: Laboratory (L) and Theoretical Practice (TP), which can be assessed continuously or alternatively by final exam.

1st continuous evaluation
• 5 laboratory works (TL), with a weight of 40%
• 2 tests related to the Practical Theory component, with a weight of 60%

2nd Global Final Assessment by Exam
• Includes questions about the Laboratory component, with a weight of 40%
• Includes questions about the Practical Theoretical component, with a weight of 60%

Where exam dates are set by the Pedagogical Council.

In all evaluation components there will be a Written and an Oral evaluation part


Grades:
- Students perform 5 labs in groups of 2 or 3 students
Each group of students will make two presentations, of 20 minutes each, respectively on two laboratory works.
•An overtime workload of 60 hours is estimated for each student.
•Only students enrolled in the subject may take assessment tests.

Fórmula de cálculo da classificação final

It is obtained that the final grade is calculated by the following expression: NF = 0.6 x TP + 0.4 x L