This only relates to those with a 2004 model onwards X5 fitted with the 6-speed Auto transmission, but you might find it interesting.
There are two types of 6-speed box, one is a low torque version and the other (i.e. for the 4.8is and perhaps 3.0d) is a high torque version.
The gearbox has 13 separate functions, but I'll only go into more detail on the Adaptive Transmission Control. the other functions are Overlap control, Starter inhibitor, Parking lock, Warming-up program, Engine intervention, Downshift inhibitor, Reverse gear inhibitor, Selector lever lock (shiftlock), Standstill decoupling, Interlock, Emergency program, Rock free from snow function.
The Adaptive transmission control is interesting though. As with earlier transmissions the 6-speed box provides the choice between comfort ('D') and sport ('DS') programs.
However, did you know that there are two separate maps for each program? These maps are compiled based on driver inputs (throttle, yaw rate, brake & deceleration etc) but in both programs the adaptive transmission changes from a basic economy map to a more performance oriented map.
In selector lever position 'D' there is an XE map (extreme economy) and an E map (economy). The EGS control unit normally selects the XE map, but in case of particular demands (e.g. load requirements) it will change to the more performance oriented E map. If the input signals change to a more gentle driving style then the adaptive controls will change back to a more economical XE map.
In the Sport program 'DS' with the selector lever in position M/S there is the basic S map (sport) and the performance oriented XS map (extreme sport). If an extremely dynamic driving style is called for, the system will change from the S map to the XS map.
The adaptive systems responds to driving uphill (or towing a trailer), driving downhill, braking/deceleration and winter driving (i.e. info from the DSC). Otherwise the adaptive systems respond to the type of driver using the car and assesses the rate of throttle movement, cornering approach (i.e. wheel speed sensors, yaw rate, road speed), constant-speed travel values and how aggressively you are decelerating.
The adaptation process is restarted each time the car pulls away from a standstill. Adaptation works by comparing the inputs with a set of threshold values that have been constructed from the moment your car was driven following it's last reset (usually at the factory).
Well, now you know. :thumbup:
There are two types of 6-speed box, one is a low torque version and the other (i.e. for the 4.8is and perhaps 3.0d) is a high torque version.
The gearbox has 13 separate functions, but I'll only go into more detail on the Adaptive Transmission Control. the other functions are Overlap control, Starter inhibitor, Parking lock, Warming-up program, Engine intervention, Downshift inhibitor, Reverse gear inhibitor, Selector lever lock (shiftlock), Standstill decoupling, Interlock, Emergency program, Rock free from snow function.
The Adaptive transmission control is interesting though. As with earlier transmissions the 6-speed box provides the choice between comfort ('D') and sport ('DS') programs.
However, did you know that there are two separate maps for each program? These maps are compiled based on driver inputs (throttle, yaw rate, brake & deceleration etc) but in both programs the adaptive transmission changes from a basic economy map to a more performance oriented map.
In selector lever position 'D' there is an XE map (extreme economy) and an E map (economy). The EGS control unit normally selects the XE map, but in case of particular demands (e.g. load requirements) it will change to the more performance oriented E map. If the input signals change to a more gentle driving style then the adaptive controls will change back to a more economical XE map.
In the Sport program 'DS' with the selector lever in position M/S there is the basic S map (sport) and the performance oriented XS map (extreme sport). If an extremely dynamic driving style is called for, the system will change from the S map to the XS map.
The adaptive systems responds to driving uphill (or towing a trailer), driving downhill, braking/deceleration and winter driving (i.e. info from the DSC). Otherwise the adaptive systems respond to the type of driver using the car and assesses the rate of throttle movement, cornering approach (i.e. wheel speed sensors, yaw rate, road speed), constant-speed travel values and how aggressively you are decelerating.
The adaptation process is restarted each time the car pulls away from a standstill. Adaptation works by comparing the inputs with a set of threshold values that have been constructed from the moment your car was driven following it's last reset (usually at the factory).
Well, now you know. :thumbup:
