ARRANGEMENT FOR DETECTING A CRITICAL DRIVING TORQUE IN A MOTOR VEHICLE

摘要

In order to detect a critical driving torque or an information representing the coefficient of friction at the road adhesion threshold for a vehicle having several driven wheels (5), at least two of the driven wheels (5) are associated to torque controlling means (13) that allow the ratio between the driving torques of both driven wheels (5) to be varied. Torque detecting means generate a torque signal that corresponds to the strength of at least the highest driving torque among those of both driven wheels (5). Wheel slip detecting means (19) that detect the increase in wheel slip of the wheel (5) with the highest driving torque beyond a predetermined slip threshold are associated to the driven wheels (5). The information on the coefficient of friction is generated depending on the strength of the detected driving torque of the wheel (5) whose slip exceeds the slip threshold. In order to determine the information on the coefficient of friction, the distribution of the driving torques of front axle (7) and rear axle (9) is periodically and alternatively increased.