Mercedes-Benz OM 651 Service Manual page 48

Thermal management
Along with optimization of the warm-up and cooling
processes, the newly designed thermal management
system incorporates the following function
sequences:
• Maximum heating combustion
• Overheating protection
• Post-start phase
Exhaust emissions are reduced by the extended
thermal management system. The table below shows
the new measures and the associated results.
Measure
Switchable oil spray nozzles and coolant pump
Two-piece water jacket
Optimized EGR cooling output
Oil pump volume-controlled at clean oil side
– This printout will not be recorded by the update service. Status: 09 / 2008 –
Exhaust treatment
Many pollutants can be converted before they leave
the vehicle through exhaust treatment in the exhaust
system. The use of an oxidation catalytic converter
and a diesel particulate filter (DPF) enables the
following pollutants in the exhaust gas to be reduced:
• Nitrogen oxides (NO
• Hydrocarbons (HC)
• Carbon monoxide (CO)
• Soot particles
Result
This speeds up the warm-up phase after a cold start.
This improves control capabilities and heat
dissipation.
The temperature and oxygen concentration in the
combustion chamber are lowered, which produces a
cooler fuel / air mixture and reduces soot formation.
The exhaust flow produced by the engine is reduced.
This reduces the drive resistance.
Introduction of New Generation of 4-Cylinder Inline Engines, OM 651
Emission reduction
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