CONCEPT OF MAN B&W ME ENGINE

The ME engine concept consists of a hydraulicmechanical
system for activation of the fuel injection
and the exhaust valves. The actuators are
electronically controlled by a number of control
units forming the complete Engine Control System.
MAN Diesel has specifically developed both the
hardware and the software inhouse, in order to
obtain an integrated solution for the Engine Control
System.
The fuel pressure booster consists of a simple
plunger powered by a hydraulic piston activated
by oil pressure. The oil pressure is controlled by
an electronically controlled proportional valve.
The exhaust valve is opened hydraulically by
means of a twostage exhaust valve actuator
activated by the control oil from an electronically
controlled proportional valve. The exhaust valves
are closed by the ‘air spring’.
In the hydraulic system, the normal lube oil is used
as the medium. It is filtered and pressurised by a
Hydraulic Power Supply unit mounted on the engine
or placed in the engine room.
The starting valves are opened pneumatically by
electronically controlled ‘On/Off’ valves, which
make it possible to dispense with the mechanically
activated starting air distributor.
By electronic control of the above valves according
to the measured instantaneous crankshaft position,
the Engine Control System fully controls the
combustion process.
System flexibility is obtained by means of different
‘Engine running modes’, which are selected either
automatically, depending on the operating conditions,
or manually by the operator to meet specific
goals. The basic running mode is ‘Fuel economy
mode’ to comply with IMO NOx emission limitation.