Patent ID: 7779952

Claim:
Drive system for a vehicle driveline comprising a pair of interconnected first transverse drive shafts extending in opposite directions, each of the first transverse drive shafts supporting a ground engaging member, a first arrangement allowing the pair of first transverse drive shafts to rotate at different speeds, wherein the arrangement comprises a pair of individually selectively engagable clutches, one clutch for each associated first transverse drive shaft of the pair of first transverse drive shafts, wherein each of the clutches is configured for engaging and disengaging, respectively, the associated first transverse drive shaft to a driving connection with a source of motive power, a main gear box, a first drive shaft configured to extend in a vehicle longitudinal direction and which rotatively connects the main gear box and the first pair of transverse drive shafts, a pair of second transverse drive shafts extending in opposite directions, each of the second transverse drive shafts supporting a ground engaging member, a second arrangement allowing the pair of second transverse drive shafts to rotate at different speeds, a second drive shaft configured to extend in a vehicle longitudinal direction and which rotatively connects the main gear box and the second pair of transverse drive shafts, a longitudinal clutch arranged for engaging and disengaging, respectively, the second pair of transverse drive shafts from a driving connection with the main gear box, a control unit, a pair of rotational speed sensors, one rotational speed sensor for each associated one of the pair of first transverse drive shafts, each rotational speed sensor being arranged to send to the control unit information regarding a rotational speed of a ground engaging member associated with the associated one of the pair of first transverse drive shafts, and the control unit being arranged to individually and selectively engage and disengage each of the clutches in response to the information.