5 Series E60 525d (M57TU) SAL
map (sport) and the performance-orientated XS map (extreme sport). If an extremely dynamic driving style
is called for, the system will change from the S map to the performance-orientated XS map.
The adaptive transmission control takes the following demands into account:
•
Adaptation to driver type
•
Driving uphill or trailer towing
•
Driving downhill
•
Braking deceleration and automatic upshift
•
Winter program
Adaptation to driver type
The adaptation to different driver types is done using the following values:
-
Kick-fast
If the accelerator pedal is depressed rapidly, the shift program is changed accordingly. This is
achieved by the detected accelerator-pedal value being compared with threshold values in the EGS
control unit. The result of this comparison is the proposal of one of the two possible programs (XE or E
in comfort program, S or XS in sport program).
-
Cornering detection
Cornering detection reacts to the vehicle's lateral acceleration with an indirect adaptation to the driver
type.
Lateral acceleration is considered an indirect statement of the preferred driving dynamics and does not
cause an immediate gearshift response (shifts when cornering could adversely affect driving stability).
Lateral acceleration is calculated from the signals from the wheel-speed sensors, from the yaw rate
and road speed.
-
Brake evaluation
The braking action is evaluated in a similar way to "kick-fast".
The braking deceleration is measured and compared with threshold values in the EGS control unit.
The result of this comparison is the proposal of one of the two possible programs (XE or E in comfort
program, S or XS in sport program).
The driver-type adaptation is restarted each time the vehicle pulls away from a standstill.
Driving uphill or trailer towing
These functions are based on a comparison of actual car acceleration with a nominal value. From the
current engine operating situation, the acceleration with normal load on a level surface is calculated. If the
actual acceleration is significantly below the theoretical value, the "Driving uphill or trailer towing" function is
activated.
The design of the corresponding shift characteristics allows a high-speed driving style. Undesirable upshifts
and frequent up/downshifts are eliminated or greatly reduced.
Driving downhill
If the EGS control unit detects downhill driving, it will automatically shift down a gear if the vehicle's speed
picks up. This enhances the engine's braking effect. A downshift is only effected if the engine speed is
below the maximum speed of the lower gear.
The EGS control unit detects downhill driving on the basis of signals from the throttle valve potentiometer
(load), wheel speed sensor (road speed) and brake light switch (brake activation).
Braking deceleration and automatic upshift
To decelerate the vehicle, the foot is taken off the gas and the brake depressed as necessary. The
SBT 6-speed automatic transmission E53, E60, E61, E63, E64, E65, E66, E70, E81, E83,
BMW AG - TIS
12.02.2013 15:25
Issue status (12/2007) Valid only until next DVD is issued
Copyright
Page - 6 -
