Combustion engines main principles and definitions Reciprocating combustion engines architecture Reciprocating engines dynamic properties Engine components and systems The engine management system for gasoline and Diesel engines The emission Requirements & Technology Engine vehicle integration 7.1 Engine layout and mounting 7.2 Engine-vehicle cooling system 7.3 Intake system 7.4 Exhaust system

Main functions The main function of an engine intake system is to deliver combustion air to the engine. To condition the air, just particulate removal, to protect engine parts from airborne impurities (dirt and other particulate matter). To reduce noise transmitted from the engine intake. To give a positive contribution to the engine performance Composition The intake snorkel (opening for the intake air to enter the system) Tube leading to the air filter (“dirty air line”) Air filter Tube leading to the engine (“clean air line”) Air mass flow meter Throttle body Resonator (silencer) to minimize the noise entering the cabin Blow by inlet

Typical engine intake system snorkel Dirty air Filter box Air filter Clean air Typical engine intake system

Intake system main design guidelines 5.0 ¸ 5.5 l/l of engine displacement Resonator Sizing for intake noise reduction Technology / costy Mean air flow rate (depending on engine diaplacement) Airborn impurity (vehicle mission) Replacemnet interval Filter volume function of

Intake system main design guidelines Example of the relation among filtering surface, dust concentration and service interval (air flow rate 220 m3/h)

Engine on-board air filter

Example of vehicle on-board air filter

Example of vehicle on-board air filter for a diesel engine

Intake line pressure drop minimization Theoretical effect of the charge air pressure in the intake manifold on the engine maximum output motore

The air charge optimization Various component effect on the engine torque and volumetric efficiency

Snorkel positioning Intake opening point (snorkel) positioned just below the left front lights)

Snorkel positioning Intake opening point (snorkel) positioned on the vehicle front end outside the engine compartment (fresh and dynamic air))

Mass flow meter positioning blow-by inlet connection Compressor inlet Flow meter Air filter Air mass flow meter positioning Flange-hose installation Air mass flow meter positioning Hose-hose installation