Identification of environment means identifying unusual ambient conditions in which the vehicle is operating.
Slippery conditions require a gear ratio which enhances traction and the stability of motion of the vehicle.
Wheelslip monitoring via anti-lock braking sensors may confirm poor tire grip, and a winter shift program can be selected.
Return to a normal gear selection pattern is controlled by a high-friction function which evaluates engine torque and wheelslip, to establish when this condition has again been reached.
For driving on steep gradients or with a heavy load, a performance-type shift program can prevent "hunting" or too frequent up- and down-shifts between adjacent ratios.
