The ability to lock up the torque converter has been used for some time, even
on vehicles with more conventional automatic transmission. This gives better
fuel economy, quietness and improved driveability. Lock-up is carried out
using a hydraulic valve, which can be operated gradually to produce a smooth
transition. The timing of lock-up is determined from ECU memory in terms of
the vehicle speed and acceleration.
14.4.3 Tiptronic
Developed by Porsche, Tiptronic S is a fully ‘intelligent’ multi-programme
automatic transmission with additional ngertip control. The dual-function,
5-speed, automatic ...
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