METHOD OF CONTROLLING A CONTINUOUSLY-VARIABLE TRACTION CHAIN OF A MOTOR VEHICLE, WHICH IS DESIGNED TO IMPROVE NOISE CHARACTERISTICS

摘要

The invention relates to a method of controlling a continuously-variable traction chain of a motor vehicle, which is designed to improve noise characteristics. The inventive control method consists in: selecting an operating mode from either a permanent mode or a transitory mode, according to a set of variables including the estimated acceleration control, vehicle speed and crankshaft speed values; and correcting the value of the rotational speed of the output shaft such that, if the permanent mode has been selected, the running average (L') of the gear ratio (L) over a period (T) is between a first negative threshold value (S1) and a second positive threshold value (S2), and, if the transitory mode has been selected, the running average (L') of the gear ratio (L) is outside of the range of values defined by the first (S1) and second (S2) threshold values.