Transcript Diapositiva 1 - Politecnico di Milano

Engine Vehicle Integration – Exhaust system
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 mounting
7.2 Engine-vehicle cooling system
7.3 Intake system
7.4 Exhaust system
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – Exhaust system
HOT END
 Exhaust manifold and turbo group
Performance
 Catalysts and Particulate Filter
Emission
COLD END
 Mufflers (silencers)
Volume & technology
Comfort
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – Exhaust system
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
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – Exhaust system
Short and simple
exhaust manifold (4-1)
Example of catalyst positioned very close to the engine
(close coupled) inside the engine compartment
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – Exhaust system
Catalyst positioned very close to the engine
(close coupled) inside the engine compartment
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – Exhaust system
Twin main catalyst positioned inside the engine
compartment of a high performance 4 L engine
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – Exhaust system
Twin main catalyst positioned inside the engine
compartment of a high performance 4 L engine (bottom view)
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – Exhaust system
Complete exhaust system
Two pre-catalysts inside the engine
compartment and under-floor main (4L engine)
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – 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
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – 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 (bottom view)
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – Exhaust system
V6 engine transversal installed – Twin exhaust system (stereo system):
two close-coupled pre-catalysts and two under floor main catalysts
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – Exhaust system
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.
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – Exhaust system
Catalyst positioned immediately downstream the
turbo of a direct injection Diesel engine
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – Exhaust system
Catalyst positioned downstream the turbo of
a direct injection Diesel engine
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – Exhaust system
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science
Engine Vehicle Integration – Exhaust system
Catalyst positioned downstream the turbo of a
direct injection Diesel small capacity engine
Scuola di Dottorato di Ricerca 2010 - Road vehicle and engine engineering science