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The BMW Range
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E90, E91, E92, E93
Jerking when coming to standstill
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<blockquote data-quote="sillycarx" data-source="post: 412670" data-attributes="member: 17377"><p>Actually the mechanic showed me a memo they got on how to quickly train the adaptive gearbox. The program involves 3 step, and you're suppose to repeat the 3 step for 8-10 times.</p><p></p><p>step 1: Drive from 0 to 110km with 30% throttle smoothly, and continue to drive constantly at 110km for a while. (like 1-2 mins)</p><p>step 2: Let the car roll, without pressing break and let it slow down from 110 to 40.</p><p>step 3: Break the car slowly until it comes down to stop from 40. and then hold the break ( while in D) while stoped for at least 5 sec. </p><p></p><p>This is my take on what this excercise does. NOT PROVEN, just thinking about how the adaptive gearbox works. I think there is 2 parts to the adaptive gearbox. </p><p>Part 1 involves the gearbox learning the characteristics of the car ( load, engine, weight, the gears themselves, the torque converter slip and etc).</p><p>Part 2 involevs the gearbox learning to the driving style of the driver. </p><p></p><p>So, I think in Part 1, the gear is really learning how fast it switch between gears, when it needs to downshift when the car slows down, how to have a smooth transitions of gear... I would imagine it will built a table of slow, normal & agreessive upshift time for each gear transition and etc. </p><p></p><p>Now in Part 2, the gearbox will try to figure out if the driver is looking to be slow, normal or agressive for a particular shift. IE, if you floor your padel, you're looking for agreesive down shift. Or things like, if the gearbox should hold the gear longer vs shorter etc. </p><p></p><p>So I think, it is the part1 training which causes this problem, and I think it might be worth clearing the memory, if we change something whcih effects the driving dynamics of the car, just so that the gearbox will relearn the new characteristic of the car (part 1) faster.</p></blockquote><p></p>
[QUOTE="sillycarx, post: 412670, member: 17377"] Actually the mechanic showed me a memo they got on how to quickly train the adaptive gearbox. The program involves 3 step, and you're suppose to repeat the 3 step for 8-10 times. step 1: Drive from 0 to 110km with 30% throttle smoothly, and continue to drive constantly at 110km for a while. (like 1-2 mins) step 2: Let the car roll, without pressing break and let it slow down from 110 to 40. step 3: Break the car slowly until it comes down to stop from 40. and then hold the break ( while in D) while stoped for at least 5 sec. This is my take on what this excercise does. NOT PROVEN, just thinking about how the adaptive gearbox works. I think there is 2 parts to the adaptive gearbox. Part 1 involves the gearbox learning the characteristics of the car ( load, engine, weight, the gears themselves, the torque converter slip and etc). Part 2 involevs the gearbox learning to the driving style of the driver. So, I think in Part 1, the gear is really learning how fast it switch between gears, when it needs to downshift when the car slows down, how to have a smooth transitions of gear... I would imagine it will built a table of slow, normal & agreessive upshift time for each gear transition and etc. Now in Part 2, the gearbox will try to figure out if the driver is looking to be slow, normal or agressive for a particular shift. IE, if you floor your padel, you're looking for agreesive down shift. Or things like, if the gearbox should hold the gear longer vs shorter etc. So I think, it is the part1 training which causes this problem, and I think it might be worth clearing the memory, if we change something whcih effects the driving dynamics of the car, just so that the gearbox will relearn the new characteristic of the car (part 1) faster. [/QUOTE]
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Jerking when coming to standstill
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