Table of contents: Exhaust gas neutralization systems ↓ Crankcase Emission Control System ↓ Exhaust gas neutralization system ↓ Exhaust systems ↓
Exhaust gas neutralization systems
All diesel models have a crankcase emission control system. In addition, some models can be equipped with a catalytic converter and an exhaust gas recirculation system to reduce harmful emissions.
Crankcase Emission Control System
To reduce the emission of unburned hydrocarbons from the crankcase into the atmosphere, the engine is hermetically sealed, crankcase gases and oil vapors are drawn from the inside of the crankcase through the oil separator into the air cleaner, and then burned in the engine combustion chamber. Pressure control valve (on the camshaft cover) controls the flow of gases from the crankcase.
If the engine is worn out, reduced pressure in the engine crankcase (due to increased gas breakthrough) may be the reason that part of the flow will return under all collector states.
Exhaust gas neutralization system
The catalyst is installed in the exhaust system. It is designed to reduce the amount of gaseous hydrocarbons, CO and other harmful impurities in the exhaust gas.
Some models may be equipped with an exhaust gas recirculation system. It reduces the level of nitrogen oxides produced during combustion under certain engine operating conditions by returning part of the exhaust gas back to the intake manifold through a special valve.
Exhaust systems
The exhaust system includes the exhaust manifold, muffler assembly, catalytic converter, multiple mounting brackets, and a number of connecting pipes.
On DE, NC and 1T engines a turbo generator is installed on the exhaust manifold.
The original version is on the portal AudiManual