BMW 5 Series: Automatic Transmission
The revised 8HPTU automatic transmission, which is already known from the F23
(2 Series BMW
convertible) and F85/F86 (BMW X5 M, BMW X6 M) and G12 is used in the G30.
The special features of the automatic transmission in the G30 are described in
this document.
8HPTU automatic transmission with acoustics encapsulation in the G30
- 8HPTU for 6-cylinder engines
- 8HPTU for 8-cylinder engines
- Transmission breather
- Acoustic encapsulation (three-part)
- Acoustic encapsulation (two-part)
- Mechanism for emergency release
- Electrical connection (mechatronics to vehicle electrical system)
Transmission variants
Different transmission variants are used depending on the engine installed.
Highlights
The following further developments made it possible to increase the comfort,
dynamics and efficiency
of the revamped 8-speed automatic gearbox:
- Improved driving comfort through hot-end decoupling of the rotational
imbalance of the engine by means of a centrifugal pendulum.
- Improved shifting comfort through slightly increased gear steps
(2 modified planetary gear sets).
- Increased efficiency through optimum gear spread and gear stepping.
- Reduction of vehicle-specific insulation measures due to acoustic
encapsulation on the transmission.
- Functional enhancements in the area of ConnectedShift.
- Enhanced customer experience due to new operating possibilities
with the driving experience switch or shift paddles.
Designation
The following table provides an overview of the composition of the different
transmission codes:
Sport automatic transmission
In the standard Steptronic Sport automatic transmission, the customer
additionally receives 2 shift
paddles on the steering wheel and additional functions such as:
- Launch Control
- Manual activation of coasting
- Driving into the speed limiter
ConnectedShift
ConnectedShift uses the following systems for a predictive shift strategy:
- Use of the navigation data
- Use of the radar sensors
Use of the navigation data is already known from the 5 Series LCI. Since the
introduction of the G12,
the radar sensors have been used for an anticipatory gear shift strategy.
Configuration options
Stepped Sport shift mode
This graduated sport shift mode is already known from the G12 and is offered
with the same
functionality in the G30.
Influence of the driving experience switch
Many drive variants have a SPORT PLUS mode in order to support sporty driving
with more powerful
engines. The shift characteristics are adapted as follows in the SPORT PLUS
mode:
- Sharper design of downshifts on braking.
- Further increase of the engine speed in the direction of maximum power.
Transmission emergency release
In the event of a breakdown, emergency release of the automatic transmission
is possible in 2 different
ways.
1. Mechanical transmission emergency release.
2. Electronic transmission emergency release.
Towing
Towing away the G30
- Towing on both vehicle axles
- Towing on the rear vehicle axle
- Recovery on a transport deck
Towing of the automatic transmission on the driven vehicle axle is not
permitted. Limited time- and
speed-dependent towing would not technically damage the automatic transmission,
but permanent
release of the parking lock cannot be guaranteed due to the changed mechanical
and electronic
transmission emergency release. Sudden engagement of the parking lock during a
towing operation
on the driven vehicle axle can lead to damage to the vehicle and to serious
accidents.
System wiring diagram
System wiring diagram of electronic transmission control EGS in the G30
- Engine control unit (DME)
- Electronic transmission control (EGS)
- Power distribution box, front right
- CAN terminator 4
- Body Domain Controller (BDC)
- CAN terminator 5
- Advanced Crash Safety Module (ACSM)
- Gear selector switch (GWS)
- Accelerator pedal module
- Brake light switch
- Steering column switch cluster
- Instrument panel (KOMBI)
- Dynamic Stability Control (DSC)
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Overview of xDrive in the G30
Output shaft, front
Output shaft, rear
Rear axle differential
Drive shaft
Transfer box
Drive shaft
Front axle differential
The designation of the transfer box i
Introduction
The electrical system of the new BMW 5 Series is based on the G12. The
following topic is described
in the Technical Reference Material for "ST1501 G12 Complete Vehicle".
SEE MORE:
Concept
Within the physical limits, the system helps to
keep the vehicle on a steady course by reducing
engine speed and by braking the individual
wheels.
General information
DSC detects the following unstable driving conditions,
for instance:
Fishtailing, which can lead to oversteering.
Loss of
Concept
Various connection types are available for using
mobile devices in the vehicle. The connection
type to select depends on the mobile device and
the desired function.
General information
The following overview shows possible functions
and the suitable connection types for them. The
scope of fu