Torque distribution control method for a four-wheel drive motor vehicle and corresponding vehicle

摘要

A motor vehicle with four drive wheels mounted on first and second axles, including: a transfer shaft connected to the first axle and a controlled coupling that can transfer part of the torque from the transfer shaft to the second axle; a mechanism determining respective speeds of the first and second axles, and a torque distribution control system configured to determine a slip value representative of the speed difference between the first and second axles and to control the coupling. The torque distribution control system is further configured to control the coupling such as to suppress any torque transfer via the coupling when the average slip value over a pre-determined period exceeds a threshold.

主权项

1. A method for controlling distribution of torque between two axles of a motor vehicle with four driving wheels mounted on the two axles, the method comprising:
electronically receiving data regarding a difference in speed of the two axles; determining, using a processor, a slip representing the difference in speed of the two axles based on the electronically received data; identifying, using the processor, the determined slip as a permanent slip; suppressing, using the processor, any transfer of torque to one of the two axles when an average value of the permanent slip over a configurable duration exceeds a threshold; performing a first test regarding whether the average value of the permanent slip over the configurable duration is greater than a second threshold and performing a second test regarding whether an amplitude of variation in the permanent slip over the configurable duration is less than a third threshold; and incrementing a counter when both tests are verified, wherein the counter is incremented or decremented as a function of the permanent slip, and said suppressing the transfer of torque is brought about only when the counter reaches a first threshold.