Brief description
| Brief description |
The engine has a completely enclosed crankcase ventilation. The crankcase emissions are directed via the nipple in the valve cover to the hose between the mass air flow sensor and the turbocharger, where the gases are mixed with the induction air and then combustion occurs in the engine.
To clean the exhaust emissions, a catalytic converter is used that can oxidise carbon hydroxide (C n H m ) and carbon monoxide (CO) to carbon dioxide (CO 2 ) and water (H 2 O). The catalytic converter can also contribute to partial oxidation of particles that are formed in exhausts from diesel engines.
With an EGR-system (Exhaust Gas Recirculation), a controlled amount of exhaust emissions are directed to the induction side where the emissions are mixed with the induction air. The result is slower combustion at a lower temperature and maximum pressure, which hampers formation of NOx. The EGR-system consists of a vacuum controlled valve that opens a connection between the exhaust manifold and the induction manifold as well as an electropneumatic valve for controlling the vacuum signal. This valve is in turn controlled by a PWM-signal from control module EDC 15, which controls the degree of opening and induction air-exhaust emission mixture.
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