engine vehicle integration – exhaust system scuola di dottorato di ricerca 2010 - road vehicle and...

Engine Vehicle Integration – Exhaust system

Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science

1. Combustion engines main principles and definitions

2. Reciprocating combustion engines architecture

3. Reciprocating engines dynamic properties

4. Engine components and systems

5. The engine management system for gasoline and Diesel engines

6. The emission Requirements & Technology

7. Engine vehicle integration

7.1 Engine layout and mounting7.2 Engine-vehicle cooling system7.3 Intake system7.4 Exhaust system



Exhaust manifold and turbo group Performance

Catalysts and Particulate Filter Emission

HOT END

COLD END

Mufflers (silencers)

Volume & technology Comfort



Design guidelines for gasoline engines

Exhaust manifold designed to optimize engine torque and/or power: for example, duct diameter and length, and for 4 L, the distance of the firs junction (1-3, 2-4) and also of the second from the cylinder head.

Adequate catalyst volume (space velocity): roughly equivalent to the engine capacity.

Optimization of the catalyst canning inlet flow to address the entire catalyst surface.

Reduced thermal inertia of the exhaust system upstream the catalyst for a faster catalyst warm-up



Example of catalyst positioned very close to the engine (close coupled) inside the engine compartment

Short and simple exhaust manifold (4-1)



Catalyst positioned very close to the engine (close coupled) inside the engine compartment



Twin main catalyst positioned inside the engine compartment of a high performance 4 L engine



Twin main catalyst positioned inside the engine compartment of a high performance 4 L engine (bottom view)



Two pre-catalysts inside the engine compartment and under-floor main (4L engine)

Complete exhaust system



L6 engine longitudinal installed – Twin exhaust system (one for each cylinder head): two close-coupled pre-catalysts and two under floor main catalysts



L6 engine longitudinal installed – Twin exhaust system (one for each cylinder head): two close-coupled pre-catalysts and two under floor main catalysts (bottom view)



V6 engine transversal installed – Twin exhaust system (stereo system): two close-coupled pre-catalysts and two under floor main catalysts



Design guidelines for Diesel engines

Manifold design to optimize the inlet flow to the turbo and to reduce the local thermal stress.

Adequate catalyst and particulate filter volumes: 0.8-1.0 engine capacity

Catalyst and particulate filter positioned as close as possible downstream the turbo outlet.



Catalyst positioned immediately downstream the turbo of a direct injection Diesel engine



Catalyst positioned downstream the turbo of a direct injection Diesel engine



Catalyst positioned downstream the turbo of a direct injection Diesel small capacity engine

engine vehicle integration – exhaust system scuola di dottorato di ricerca 2010 - road vehicle and...

Documents

engine close

enginevehicle cooling

engine components

engine layout

engine management system

engine compartment slide

road vehicle

engine capacity catalyst