Z Series E85 Z4 3.0Si (N52) ROADST
gearshift map triggers an upshift when the throttle is closed. These gearshifts are not necessary in
conjunction with brake applications as they prevent the engine's braking effect from being exploited.
The intention to apply the brakes can often be anticipated from the accelerator pedal being rapidly released
to the zero position. If such an action is detected, the upshift is suppressed for as long as the accelerator
pedal is in the zero position and the vehicle is in overrun mode.
Winter program (only with selector lever in position "D")
The winter program is automatically activated if the drive wheels start to spin even at a low rate of
acceleration. The winter program ensures better traction by not using 1st gear. Early upshifts reduced the
reactions caused by load changes. The winter program is deactivated if the wheels do not spin for several
seconds despite high drive torque.
Overlap control
Overlap control provides gentle shift characteristics as follows: With overlap control, several multi-plate clutches
are in use at the same time. Here, pressure is reduced in the active multi-plate clutch and at the same time built
up in the clutch that is about to be activated. The reduction and build-up of pressure is maintained until a
synchronised speed is reached. At this point, the hydraulic pressure for the multi-plate clutch to be activated can
be built up completely. Overlap control is active for all gearshifts from 1st to 6th gear and from 6th to
1st gear.
Starter inhibitor
It is only possible to start the engine when the selector lever is in position "P" or "N".
> E53, E83, E85, E86
The EWS (electronic immobiliser) evaluates the following signal from the EGS (electronic transmission control)
for the start:
•
Selector lever position "P" or "N" as signal via the direct wire
> E60, E61 until 03/2007
> E63, E64 until 09/2007
> E81, E87, E90, E91, E92, E93
The CAS (Car Access System) evaluates the following signals from the EGS (electronic transmission control) for
the start:
•
Selector lever position "P" or "N" as CAN message via the powertrain CAN
•
Selector lever position "P" or "N" as signal via the direct wire
> E60, E61 from 03/2007
> E63, E64 from 09/2007
> E65, E66, E70
The CAS (Car Access System) evaluates the following signals from the EGS (electronic transmission control) for
the start:
•
Selector lever position "P" or "N" as CAN message via the powertrain CAN
•
Selector lever position "P" as signal via the direct wire
In principle, the CAN message is used. If the message is incorrect or invalid, it switches to the signal from the
direct wire.
Parking lock
The parking lock locks the transmission output shaft. The vehicle is prevented from rolling unexpectedly. The
parking lock is designed to provide a reliable brake on gradients up to 32 %.
SBT 6-speed automatic transmission E53, E60, E61, E63, E64, E65, E66, E70, E81, E83,
BMW AG - TIS
18.02.2013 04:13
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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