Automated manual transmissions show big advantages compared to other transmission types: They are the transmissions with the best efficiency (at least for lower and medium engine torques). And these transmissions are much more cost-effective than other automated transmission solutions like AT or DCT. However, the market penetration of these transmissions has stayed limited to small vehicles and light commercial vehicles due to comfort restrictions related to this transmission type: torque interruption and relatively long shifting times are criticized by many users of these vehicles. In the last years, ZF perceives a growing interest for AMT systems due to their low cost, low weight and small installation space. Therefore some optimizations have been done, in order to improve the comfort of the system without considerably increasing the costs. First step is to improve the electro-mechanic actuators in order to reduce shifting times and to increase robustness over lifetime. The next step is the optimization of the AMT software and functionality. New algorithms allow shorter shifting times, additional functions have been integrated. Out of the experience of former AMT and DCT projects, ZF has developed a new interface between engine and gearbox, leading to an improved shifting comfort. ZF is able to provide the whole AMT system including the TCU out of one hand, thus it is able to perfectly optimize the system to the customer's needs.
Optimized AMT Systems from ZF: A Choice for Comfort and Fuel Consumption Improvement in the Small Car Segment
2012
10 Seiten
Aufsatz (Konferenz)
Englisch
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