Method and apparatus for tailoring rated characteristics of torque delivered by a clutch as a function of estimated torque difference

Abstract

The invention relates to a device (D) for adjusting the torque rating curve transmitted by a clutch (EM) according to the position of the actuator of said clutch (EM), said device (D) being configured to i) define a new an adjusted nominal position, said rescaled nominal position being equal to the nominal position minus the reference position of the nominal curve, ii) for at least one selected rescaled nominal position, determining the observed torque versus the estimated and corrected possible The torque difference between the transmittable torque, the estimated and corrected transmittable torque is a function of the correction factor and the estimated transmittable torque, which is the conversion factor value and the first a function with the second nominal extremum curve, and iii) for each selected readjusted nominal position, determine the corresponding nominal torque on the rescaled nominal curve such that according to the corresponding determined torque difference The rated torques are adjusted to obtain adjusted rated torques, and the rated variation curves as a function of each adjusted rated torque are adjusted to obtain the adjusted rated variation curves.

Description

technical field [0001] The present invention relates to the control of torque transmitted by a clutch to an automatic transmission. Background technique [0002] "Automatic transmission" is here understood to mean a transmission whose operation is controlled by a computer or monitoring system. It therefore relates in particular to automated transmissions, manually actuated transmissions or dual clutch transmissions (or DCTs), and more particularly to all transmissions associated with coupling systems of the dry friction or wet friction clutch type. [0003] In some fields, for example in the field of vehicles, optionally in the field of motor vehicles, the speed (or gear ratio) change performance of (automatic) gearboxes and the performance of implementing vehicle motions are mainly determined by the transmission from the clutch to the first transmission of the gearbox. The control accuracy of the torque transmitted by an axis. For precise control of this transmitted torqu...

AI Technical Summary

Problems solved by technology

[0008] - Strictly monotonic shape and monotonic gradient cannot be guaranteed, the clutch characteristics for determining the position setpoint from the transmitted torque cannot be converted directly and are therefore limited to performing cyclic adjustments to converge towards the final position setpoint ,

[0009] - Lack of feedforward correction forces stronger tuning to compensate for thermal effects, which is not good for initialization of cold clutch features after experiencing a hot environment

Images