The module aims at providing the students of Automotive Engineering with specific knowledge of light- and heavy-duty automotive propulsion systems, and in particular related to internal combustion engines. As a first step, an overview of the basic concepts developed within the module “Thermal Machines” will be carried out. Furthermore, the design aspects of internal combustion engines and their apparatus and how they operate will be considered. The last part of the course is relative to the specific knowledge of the application of the propulsion systems to the vehicle.

Knowledge of propulsion architecture as well as operating and control features in the configurations used for light- and heavy-duty engines. Ability to carry out predictive calculations of engine performance and to work on preliminary designs for the main engine components. Ability to identify the parameters that influence the trade-off between performance, fuel consumption and engine emissions. Familiarity with the propulsion thermal management, the general layout of the engine compartment, the evaluation of fuel consumption and vehicle performance and their dependence on engine, gearbox and vehicle parameters, the main control strategies implemented in the engine management system in order to optimize the function of the engine and the vehicle.

The knowledge acquired through the course of Thermal Machines is required, along with the basic notions of Thermodynamics and Thermokinetics, Applied Mechanics and Fluid Mechanics.

PART A: PROPULSION SYSTEMS - Engine operation: inlet processes in four-stroke and two-stroke engines; control parameters. - Valvetrain functional analysis - Fundamental concepts of combustion in spark-ignition engines: fuels; cyclic variations, partial burning and misfiring; abnormal combustion. - Fundamental concepts of combustion in compression-ignition engines: fuels; spray; ignition delay; premixed and mixing-controlled burning. - Intake and exhaust systems in four-stroke engines; two-stroke cycle scavenging flows and port arrangements; supercharging with specific reference to turbo-charging. - Fuel metering systems in spark-ignition engines and compression-ignition engines. PART B: APPLICATION TO THE VEHICLE B.1 Vehicle thermal management Objectives and overview of vehicle cooling systems. Definition of ATB (air to boil) index. Descriptions of the components of the engine cooling system for conventional vehicles. Requirements and innovations about advanced cooling systems for conventional vehicles. HVAC system. Requirements and configurations of thermal management for hybrid electric vehicles. Lubrication system and its requirements. B.2 Propulsion system installation in the vehicle. Powertrain configurations and positioning inside the engine and vehicle compartments. Exhaust and intake line positioning inside the engine compartment and along the vehicle Installation of air mass flow-meter and heat exchangers. B.3 Engine-vehicle matching. Review of longitudinal vehicle dynamics base equation; evaluation of total running resistance of the vehicle by analytical equations and by the experimental coastdown method; performance index of the vehicle; analytical model for the fuel consumption prediction starting from the engine steady-state maps; engine vehicle matching criteria to comply with the vehicle design targets with special concern to the consumption-performance trade-off. B.4 Application of engine management system to the vehicle. Purpose and overview of the engine management system; description of the sensors and actuators that interface with the ECU (electronic control unit); main strategies and algorithms of the engine control management.

The course is made up of lectures, applied lectures and laboratories. The applied lectures consist of calculations meant to further deepen the understanding of the concepts dealt with within the lectures. The laboratories are related to: disassembly and re-assembly of an internal combustion four-stroke engine; experimental tests on the dynamometric rig of the Politecnico di Torino; lab at FCA climatic and aerodynamic wind tunnels: description of the experimental tests performed on the vehicles to evaluated ATB indices.

Slides in pdf format are provided through the course web page. The reference book is: - J.B. Heywood: “Internal Combustion Engines Fundamentals”, McGraw-Hill, 2nd edition, 2018. For further details and reading students may consult the following books: - R. Basshuysen, F. Schäfer, “Internal Combustion Engine Handbook”, SAE International, 2nd edition, 2016. - G. Ferrari: “Motori a combustione interna”, Esculapio, 2nd edition, 2016. - G. Lechner, H Naunheimer, “Automotive Transmissions – Fundamentals, Selection, Design and Applications”, Springer, 2nd edition, 2011. - N. Watson, M. S. Janota, “Turbocharging the Internal Combustion Engine”, New York: John Wiley & Sons, 1982. - Bosch Professional Automotive Information: “Automotive Electrics and Automotive Electronics”, 5th Edition, Springer, 2007. - Bosch Professional Automotive Information: “Diesel-Engine Management”, Springer 2014. - Bosch Professional Automotive Information: “Gasoline-Engine Management”, Springer 2015.

Slides; Dispense;

Modalità di esame: Prova orale facoltativa; Elaborato progettuale in gruppo; Prova scritta in aula tramite PC con l'utilizzo della piattaforma di ateneo;

Exam: Optional oral exam; Group project; Computer-based written test in class using POLITO platform;

... The final examination aims at checking and verifying that the expected learning outcomes (detailed in the specific box above) have been achieved. The exam is generally in the written form. However, the professor only can decide that an additional oral test is necessary to pass the exam. The final mark will be a weighted average of the reports of the applied lectures (which accounts for 20% of the final mark), the written examination and a possible oral part. To take part to the exam it is necessary: - to submit the applied lecture reports for correction before the exam (the deadline for the submission is one week before the day of the exam). Once the applied works are handed in, they will be corrected and will be evaluated for the final score. It is not possible to send a second version of the applied works. - to book through the web site of the course. The exam can be taken according to one of the following options. Option A: multiple choice questions (MCQ) and open questions (OQ). The final mark will be given according to the following weights: reports: 20%, MCQ: 40%, OQ: 40%. Option B: multiple choice questions (MCQ) only. The final mark will be given according to the following weights: reports: 20%, MCQ: 80%. The maximum possible final mark is limited to 27/30. Each student can decide the preferred option after the results of the MCQ part. MCQ part (approx. time 40/60 min) will have 18 questions: correct answer: 2 points not answered: 0 points wrong answer: -0.5 points Some MCQ can be related to simple problems (in this case the use of the calculator is allowed) The maximum mark of MCQ test will be anyway limited to 30. If the mark of MCQ is < 18 the exam is failed and OQ part cannot be taken. The OQ part is generally taken in oral form and is related open questions and each of them can be discussed also with graphs or equations. The OQ part is taken the same day of the MCQ or few days afterwards. Material needed to attend the written exam: pen, student card, one blank sheet to be used as draft paper. The calculator (not the mobile phone) can be possibly used, if specified by the professor.

Gli studenti e le studentesse con disabilità o con Disturbi Specifici di Apprendimento (DSA), oltre alla segnalazione tramite procedura informatizzata, sono invitati a comunicare anche direttamente al/la docente titolare dell'insegnamento, con un preavviso non inferiore ad una settimana dall'avvio della sessione d'esame, gli strumenti compensativi concordati con l'Unità Special Needs, al fine di permettere al/la docente la declinazione più idonea in riferimento alla specifica tipologia di esame.