Driving-torque control system for four-wheel-drive vehicle

Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Clutch control

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Details

701 68, 701 69, 701 66, 701 89, 180248, 180247, 180233, 180197, 477 35, 477 36, 477903, 477904, G06F 770, B60K 17344

Patent

active

058390847

ABSTRACT:
A driving-torque control system for a four-wheel-drive vehicle includes a transfer clutch employed in a transfer of the four-wheel-drive vehicle for varying a distribution ratio of driving torque between front and rear road wheels depending on a front-and-rear wheel revolution-speed difference. A calculation unit derives a command value of the engaging force of the transfer clutch from the front-and-rear wheel revolution-speed difference. A load-condition detection unit detects an input load condition of the transfer clutch, on the basis of the front-and-rear wheel revolution-speed difference and the command value of the engaging force. A comparing unit compares the input load condition detected by the load-condition detection unit with a predetermined threshold. A compensation unit compensates the engaging force of the transfer clutch so that the transfer clutch is held in a completely engaged state for a predetermined holding time duration, when the input load condition exceeds the predetermined threshold.

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