Direct Petrol Injection System with Bosch Motronic MED 7 - Volkspage

Exhaust system
This was adapted to the requirements of a direct
petrol injection engine. Exhaust gas
aftertreatment was previously a major problem
in connection with direct petrol injection engines.
This is because the statutory nitrogen oxide limits
cannot be achieved in lean stratified charge
mode or in homogeneous lean charge mode by
using a conventional closed-loop catalyst.
A NOx storage catalyst which accumulates
nitrogen oxides (NOx) in these operating modes
is therefore fitted to these engines. When the
reservoir is full, the system goes a regeneration
mode, releasing the nitrogen oxides from the
storage catalyst and converting them to nitrogen.
Air ducting to the exhaust manifold (only Lupo FSI)
Motronic control unit (J220)
NOx sensor control unit (J583)
NOx sender (G295)
NOx storage catalyst
Exhaust manifold with
Closed-loop catalyst
Triple flow exhaust pipe
Exhaust gas temperature sender (G235)
253_150
Broadband lambda probe (G39)
The advantage of exhaust gas recirculation and variable valve timing is that nitrogen oxide
emissions are reduced during the combustion process.
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