When the cruise control (GR) is selected, the AGS control unit switches over to a special transmission program for controlled driving. This gearshift program ensures that the available engine output can be utilised to the full extent in this driving situation. Frequent up and downshifts, i.e. frequent, fast successive gearshifts between two adjacent gears, are reduced to a minimum. A time delay is programmed to avoid abrupt gearshifts.
The information from the cruise control (GR) control unit to the transmission control unit flows via a serial interface. Data are transferred on the one-wire line at a rate of approx. 25 Baud.
The gearshift program takes into consideration the following driving situations:
Driving situation |
Characteristics |
|---|---|
Constant driving |
Comfort-oriented, i.e. low engine speed level |
Resume |
Maximum tractive force |
Acceleration procedures |
Maximum tractive force |
Deceleration procedure |
Upshifts are avoided for optimum deceleration capacity |