SYSTEM AND METHOD FOR CONTROLLING THE CHANGE IN MODE OF AN INFINITELY VARIABLE TRANSMISSION IN PURELY ELECTRICAL MODE

摘要

System for controlling the change in mode of an infinitely variable transmission comprising a first mode of operation at high torque at high speed and a second mode of operation at high torque at low speed, fitted to a motor vehicle that is also equipped with at least two electric machines (2a, 2b), with at least one internal combustion engine (1), the infinitely variable transmission being connected mechanically to the electric machines (2a, 2b) and to the internal combustion engine (1), comprising a means (44) of determining the internal combustion engine rotation speed setpoint; an adder (47) capable of calculating the difference between the internal combustion engine rotation speed setpoint and the internal combustion engine rotation speed measurement; a means (49) of determining the torque of the first electric machine able to determine a torque setpoint for the first electric machine (2a) as a function of the difference between the rotation speed setpoint of the internal combustion engine (1) and the measured rotation speed of the internal combustion engine (1); a compensation means (52) able to determine a torque setpoint for the second electric machine (2b) as a function of the torque setpoint of the first electric machine (2a) and of the driver's demand for torque; the control system being able to control the second electric machine (2b) in such a way that the change in mode can be performed while the vehicle is being propelled, before and after the change in mode, under the sole action of at least one electric machine.