Mercedes-Benz Automatic Transmission 7G Tronic Plus
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From: Tromsø, 69° 41' N
2010 GLK 220CDI 4M BlueEFFICIENCY
Mercedes-Benz Automatic Transmission 7G Tronic Plus
A poster on a thread, German forum, Vielen Dank mji, drew my attention to "Mercedes Transmission Evolution", note the article on the Europeantransmissions WEB: http://www.europeantransmissions.com/
Yet not for the GLKs, but who knows?
Yet not for the GLKs, but who knows?
Last edited by GLKKa2H; Feb 12, 2011 at 12:06 PM. Reason: Another typo!
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..."link stolen" from the German website 
http://www.europeantransmissions.com...edes-trani.PDF
EVOLUTION TO THE SEVEN-SPEED AUTOMATIC TRANSMISSION 7G-TRONIC PLUS - Daimler finalized the advanced development of the sixth generation of its seven-speed automatic transmission for more comfort, less fuel consumption and more driving pleasure. Assembled in E-, R-, S- and CL-Class, the 7G-Tronic Plus has a new fuel efficient torque converter with centrifugal pendulum damper and regulated zero slip at the torque converter lock-up clutch as well as a new automatic transmission lubricant (FE-ATF).............. ( 6 pages )
among other: start-stop capability by way of an additional electric pump
Summary:
SUMMARY
Finally, the new seven-speed automatic transmission from Daimler is equipped with a start-stop system for the first time, made possible with the addition of an electric auxiliary transmission oil pump that safeguards the pressure supply when the constant-flow pump is not running (engine off). The vehicle can start off again without delay following a brief stop. A next-generation torque converter optimizes NVH levels thanks to more advanced dampers, which also noticeably reduce fuel consumption. This is achieved by greatly reducing the slip of the lock-up clutch (actively regulated zero slip) in conjunction with better mechanical damper insulation from very low engine speeds and during gear shifts, despite the fact that the nominal and reaction torque of the engines has increased. The gear shift program has also been modified to reduce engine speed in Eco mode, 8. In addition, the new FE converter provides for optimal acceleration from a stop, smoother operation of the torque converter lock-up clutch, and better response to movements of the accelerator pedal.
Consumption-reducing measures were implemented for the transmission as well and include new automatic transmission fluid (ATF134FE) with reduced viscosity in conjunction with an optimized additives package, redesigned internal componentry for the transmission, with new materials, bearings, disk linings, and geometric enhancements, and adapted software, lower service pressure at many operating points, and better internal seals. The reworked electronic control unit for the transmission, together with improved software, make shifting smoother.
http://www.europeantransmissions.com...edes-trani.PDF
EVOLUTION TO THE SEVEN-SPEED AUTOMATIC TRANSMISSION 7G-TRONIC PLUS - Daimler finalized the advanced development of the sixth generation of its seven-speed automatic transmission for more comfort, less fuel consumption and more driving pleasure. Assembled in E-, R-, S- and CL-Class, the 7G-Tronic Plus has a new fuel efficient torque converter with centrifugal pendulum damper and regulated zero slip at the torque converter lock-up clutch as well as a new automatic transmission lubricant (FE-ATF).............. ( 6 pages )
among other: start-stop capability by way of an additional electric pump
Summary:
SUMMARY
Finally, the new seven-speed automatic transmission from Daimler is equipped with a start-stop system for the first time, made possible with the addition of an electric auxiliary transmission oil pump that safeguards the pressure supply when the constant-flow pump is not running (engine off). The vehicle can start off again without delay following a brief stop. A next-generation torque converter optimizes NVH levels thanks to more advanced dampers, which also noticeably reduce fuel consumption. This is achieved by greatly reducing the slip of the lock-up clutch (actively regulated zero slip) in conjunction with better mechanical damper insulation from very low engine speeds and during gear shifts, despite the fact that the nominal and reaction torque of the engines has increased. The gear shift program has also been modified to reduce engine speed in Eco mode, 8. In addition, the new FE converter provides for optimal acceleration from a stop, smoother operation of the torque converter lock-up clutch, and better response to movements of the accelerator pedal.
Consumption-reducing measures were implemented for the transmission as well and include new automatic transmission fluid (ATF134FE) with reduced viscosity in conjunction with an optimized additives package, redesigned internal componentry for the transmission, with new materials, bearings, disk linings, and geometric enhancements, and adapted software, lower service pressure at many operating points, and better internal seals. The reworked electronic control unit for the transmission, together with improved software, make shifting smoother.
Last edited by allanX204; Feb 14, 2011 at 03:16 AM.
