Fuel-Efficient Driveline Systems

Authors

Dr.-Ing. J. Greiner, ZF Getriebe GmbH, Kressbronn; Dr.-Ing. B. Vahlensieck, Dr.-Ing. M. Mohr, Dipl.-Ing. P. Casals, ZF Friedrichshafen AG, Friedrichshafen;

Year

2009

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 697

Summary

Passenger car automatic transmissions of torque converter/planetary or dual-clutch design have become an important distinguishing feature for vehicle manufacturers. Already since the 50s, more than 90% of all customers in the US and Japan have traditionally preferred automatic shifting, while, not long ago, the use of automatic transmissions on the European market was almost exclusively limited to premium cars with 6, 8, or 12 cylinder engines. One reason were high additional costs for the automatic transmission as an "extra", another reason was the image of this type of transmission which had the reputation of being very convenient but, above all, gas-guzzling and the opposite of sporty. This changed dramatically with the introduction of automatic transmissions featuring up to 8 gears and a high ratio spread as well as dual clutch transmissions, which are regarded as being very sporty.

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