BMW M67 - Functional Description; DDE Parameters

DI Diesel Engines M57/M67 - Common Rail Sec. 4 P.5
Course contents/Background material
Functional description
The vacuum necessary to activate the mounts is taken from a
distributor in the vacuum line between the vacuum pump and
brake booster.
Vacuum is applied simultaneously to both mounts when idling
and in the speed range close to idling. As a result, it is possible
to change over between hard or soft damping characteristics.
DDE parameters
Activation of the damping-controlled hydraulic mounts by the
DDE is based on the following parameters:
Switching Remarks
value
Engine speed 900 rpm Hysteresis (+ 50 rpm)
Vehicle speed 60 km/h
Hysteresis (+ 5 km/h)
Power supply
(DDE)
n > 950
Engine speed
n
n < 900
v > 65
Vehicle speed
v
v < 60
Engine mount soft Engine mount
(idle speed) hard
KT-210
Fig. 34: Sequence diagram/activation, damping-controlled hydraulic mount
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