New Generation N62 Engine
Chapter 4 P.23
Course Contents/Background Material
© BMW AG,
Service Training
The test function is carried out during the pre-drive check. The
pulse width repetition rate is 50%.
The maximum valve lift command is given if the LoCAN bus is
faulty. In this case, the pulse width repetition rate is 80%.
If there is a fault when the emergency programme is running
with maximum valve lift, the operating motor (N42) or the
operating motors (N62) are supplied with 30% power. This
measure drives the operating motors softly to the limit stop
which prevents the occurrence of additional mechanical faults.
The load control is now operated via the throttle valve.
- Valvetronic control unit
The Valvetronic control unit can be fitted in both the N42 and the
N62 engine. The control unit is assigned to the appropriate
engine by means of DIS or MoDiC.
The difference in the N62 hardware consists of a second
eccentric shaft adjustment motor and eccentric valve position
sensor.
As far as the DME is concerned, the Valvetronic control unit is an
intelligent actuator which adjusts the valve lift.
The eccentric shaft adjustment motors are operated by two
power output stages which can allow the motor to run on the
right and the left.
Control unit faults or faults in the Valvetronic peripherals are
detected by the Valvetronic control unit and are transmitted via
the LoCAN to the DME control unit where they are stored for
diagnostics.
