Performance Feature Of A Standard And High Performance System; Code (M5U) Engine Brake, Standard System; Code (M5V) Engine Brake, High Performance System - Mercedes-Benz OM 471 Introduction Into Service Manual

Performance feature of a standard and high performance system

The engine brake system is offered in two different power
categories. The hardware of the two systems is identical.
The differences lie in the software > both systems are fitted with a
different code>controlled data record.

Code (M5U) Engine brake, standard system

f 100 kW at 1300 rpm
f 300 kW at 2300 rpm

Code (M5V) Engine brake, high performance system

f 150 kW at 1300 rpm
f 400 kW at 2300 rpm
Component description for engine
management (MCM) control unit
Component description for engine brake
solenoid valve
i Introduction of engine OM 471 and exhaust aftertreatment > 09/2011 >
– This printout will not be recorded by the update service. Status: 09 / 2011 –
The high performance system functions according to the same
mechanical/thermodynamic principle as the standard system.
There are, however, parameters in the engine management
(MCM) control unit (A4) which ensure that the internal pressure is
increased in all cylinders in all engine brake stages over actuation
of the wastegate on the turbocharger.
The exhaust gas recirculation positioner (Y621) is also actuated if
necessary whereby the fill level of the cylinder is increased again.
The result of this is: the piston must do more work to compress
the air > the braking torque increases.
A4
Y624, Y625
Functions
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