Control of a displacement machine of a hydrostatic-mechanical torque shift transmission

Abstract

A process for controlling a hydrostatic adjustment gear (HG) of a hydrostatic-mechanical, continuous, split-output torque shift transmission, where a displacement volume (V.sub.new) is controlled following the engagement of a clutch (K2, K3) of a new gear, taking into consideration a leakage volume (DV.sub.old) in respect to a theoretical displacement volume (V.sub.th), after which the clutch (K2, K3) of the respective previously operating gear, which is still turning, is disengaged, where each new displacement volume (V.sub.new) is determined from the prior leakage volume (DV.sub.old) in accordance with different hydraulic pressure conditions in the adjustment gear (HG) prior to and following the shifting operation, where the setting of the new displacement volume (V.sub.new), which is determined in accordance with the hydraulic pressure conditions from the prior leakage volume (DV.sub.old), takes place in respect to the theoretical displacement volume (V.sub.th) in accordance with a new leakage volume (DV.sub.new). During upshifting and downshifting a differing ratio of the leakage volumes is taken into consideration, which occurs during the shifting process because of falling or rising of the hydraulic pressure. Therefore the disengagement of the clutch (K2, K3) of the prior gear takes place without torque loading during upshifting as well as downshifting.

Dependencies are inferred from the claim text.