The invention relates to a power steering device (1) for an axle assembly (2) provided with a limited slip differential (7) designed to transmit a driving torque (c5) to a first wheel (4) and a second wheel (6) and to automatically activate, in the event of a loss of synchronism and / or grip of one of the first and second wheels (4, 6), an operating mode referred to as "lock mode", in said differential transfers most of the driving torque (c5) to the slowest between the first and second wheels (4, 6), power steering also comprising a steering mechanism (10) and an power steering engine (17 ) controlled by a control module (20), said steering control module (20) containing compensation laws that allow the power steering motor (17) to compensate for certain effects such as induced force response or freezing in the steering mechanism by activation of the differential lock mode to provide the driver with a feel close to that of an axle assembly (2) which does not have a lock mode.
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