MTU 16V4000M73 Operating Instructions Manual page 32

Functions:
• Alphanumeric, monochrome LCD display for monitoring of measured values as well as alarms when limits
are violated
• Pushbuttons for menu control and dimming unit
• Combined control and display elements for local engine/gear control
• Flashing light and horn for summary alarm in engine room
• Interface to CAN field bus for connected, communicating monitoring system components
Exhaust gas aftertreatment
SCR catalytic converter with partial-flow bypass (HAPS)
Functions:
• Selective catalytic reduction (SCR) of the nitrogen oxides
• Urea solution dosage controlled by Engine Control Unit depending on operating condition of the engine,
exhaust temperature and urea solution concentration
• Homogeneous mixture of urea solution with exhaust gas with built-in mixing channel
• Hydrogen Carbon Adsorption Preventing System (HAPS) to prevent the SCR catalytic converter from over-
heating
• Compliance with the IMO III emissions regulations due to closed loop control with NOx sensor
• Monitoring of NH
• Urea solution dosage can be deactivated for IMO II operation
Low-load operation
1 Low-load operation
MTU marine engines of the Series 4000M53R to ...M93L are suitable for low-load operation. State-of-the-art
design and equipment features, e.g. TE coolant circuit, sequential turbocharging, jacketed, coolant-cooled
exhaust lines, Common Rail fuel injection and cylinder cutout allow engine operation at low load.
The SCR system was equipped with a partial-flow bypass (HAPS), which prevents inadmissible accumulation
of oil and fuel particles in the system.
32 | General Information | MS150123/01E 2017-05
emissions by NH sensor
3 3
2 Cleaning cycle 3 ditto