Transmission 9113 · And this is ho w the info rm atio n is pro cessed in the T iptro nic co ntro l u

Transmission 9113 And this is ho w the info rm atio n is pro cessed in the T iptro nic co ntro l unit: 3_11_00d The Tiptronic control unit determines the Apart from the stepless adaptation to the driver’s current requirements on the basis of driver’s requirements ranging from very the incoming information and then changes smooth and eco-nomical to very sporty and to an appropriate map. In contrast to previ- power-oriented, the Porsche Tiptronic also ous transmissions, the new Tiptronic control has the following special functions: unit has 250 different shift maps instead of just five. The maps permit virtually step-less adaptation. ? Prevention of thrust upshift-ing, e.g. be- While selecting this adaption, along with the fore curves driving style, the shift program also takes into consideration the driving resistance, If the accelerator pedal is released before a which is particularly noticeable on uphill and curve, i.e. the throttle is closed quickly, the downhill stretches. Furthermore, the Tip- gear currently being used is retained. tronic control unit also calculates an altitude If the brake is then also actuated, downshift- correction factor, i.e. since the volumetric ing appropriate to the current vehicle speed efficiency of the engine decreases with in- is performed so that the engine braking creasing altitude, the driver automatically torque is provided before the curve and the accelerates more and the transmission would optimum gear is selected for acceleration out change over to a map with more frequent of the curve. gear shifting. However, this situation is de- If the accelerator pedal is depressed again tected by the altitude sensor and the map (the throttle is opened), shifting is again most suitable for the driver continues to be performed according to the driver’s require- provided. ments. 3 - 6 Service Information 2002