Patent ID: 7169077

Claim:
Method of controlling the gear change for a vehicle having at least first and second driving wheels, each equipped with a traction chain comprising an electric motor M which drives an input shaft, a gear change mechanism having at least two reduction gears with a neutral position between gears, in which the gear change on the first and second driving wheels is carried out by offsetting over time the gear changes on the first and second driving wheels in accordance with the following sequence of steps: A) in an initial phase: A 1 ) releasing the current gear on the first driving wheel and stopping it in the neutral position, A 2 ) changing the revolution speed of the motor so as to synchronize it as a function of the reduction of the gear to be engaged on the first driving wheel, using as an estimate of the speed-to-be-reached a speed information item obtained from the second driving wheel, and A 3 ) engaging the intended gear on said first driving wheel; and then B) in a successive phase, changing the gear on said second driving wheel.