The all-new 9G-Tronic automatic transmission is making its world debut in the
Mercedes-Benz E 350 BlueTEC
, which is now on sale in Europe. No word on when or where exactly it will become available next.
According to the German automaker, this 9-speed autobox helps achieve 5.3L/100km (based on NEDC standards), for instance by allowing speeds of 120 km/h in 9th gear with the engine revving at around 1,350 rpm only. Moreover, shortened shift and reaction times ensure optimum responsiveness combined with outstanding ease of shifting, Mercedes-Benz says.
The new 9G-Tronic unit is suitable both for rear-wheel and all-wheel drives, as well as hybrid and plug-in hybrid drive systems. It will be used in almost all model series and engines in the coming years.
Friday, 26 09:00:00
Surely a continuously variable transmission would reduce the complexity of that monstrously expensive-looking piece of clockwork. It's not as though continuous variation hasn't been invented a hundred times over many decades. One of the ideas
has to work, and work as efficiently.
Sunday, 28 01:12:00
cvt needs more development before I would buy a car with one. as for 9 speed...more complex and reliability issues. maybe not.
Sunday, 28 09:09:00
I disagree that CVT requires more development, at least from a mechanical standpoint. I have driven a CVT-equipped vehicle for seven years and the CVT has not only required no repairs at all during that time, it has also been 100% maintenance free (the tranny fluid is ssealed in--no checking the level and replacement intevals for fluid are something like once a decade for average drivers).
People just are not used to them and they tend to be used on higher-revving, smaller displacement engines. CVTs are programmed to work the engine at peak efficiency during acceleration, and on those small engines that means it can drone on at 3500 to 4000 RPM until you reach speed. I did a little experiment--went to a Jeep dealership and tested a new Compass with "freedom drive I" (that has a conventional automatic) then did the exact same drive with another Compass that was exactly the same except with "freedom drive II" (with a CVT).
The latter is actually a bit heavier as it is trail rated and has been beefed up as such, however it was still faster than the lighter conventional auto to top speed. The difference was so small that it didn't matter anyways. The CVT was slower off the start but to 80km/h it was a little bit quicker. The CVT also was a bit noisier (as it lingered at higher revs) and didn't kick down at the same speed as the normal auto. These issues could be fixed by software/tuning (after all they do offer 6 simulated fixed-ratio "manual mode" in CVTs and when using that it works exactly the same as in normal autos with that feature).
The 9 speed would be more concerning to me than any CVT--it is extremely complex looking. Also, when the ratios get so close and the shifts are smoothed out by the torque converter I suspect that normal autos will start to behave very CVT like. In any case I think the only advantage to these complex conventional autos with so many gears is that they can handle the torque of larger V8s and diesels.
They also have a larger ratio range than most CVTs--you cannot cruise on a highway at 1350RPM with a CVT and still have a low range that is low enough to ensure good take-off, but that problem can be solved by "cascading" CVT mechanisms--feed the output of a set of CVT pullies or toroids into the input of a second set, multiplying the overall ratio--then you could get something to compete with the 9-speed auto. However THAT is something that probably needs more R and D than just adding more clutch packs to a normal auto (and it would still have potential problems with very high torque engines).
Ultimately though I'd just get a Tesla S to get the best performance--but that wouldn't happen for me until the recharging infrastructure is more prevalent.
Sunday, 28 01:18:00
One would think they would try to get the old one to work before building a new one? You could not give me a Mercedes , they spend more time in the shop than on the road.
Friday, 16 01:03:00
Thanks for informing us...very nice post, i really like this
Saturday, 30 06:19:00
I really like this post thanks for share.....keep it up.............
Monday, 23 12:47:00