| 摘要 |
The invention relates to a control method for uncoupling the primary shaft (1) and the output member (14) of an automatic gearbox. The gearbox comprises an epicyclic gear train (4) including an external sun gear (6) secured to the input shaft (1) and a fixed internal sun gear (5), and also a satellite carrier (7) carrying a satellite (8) meshing with these sun gears (5, 6). It comprises a second epicyclic gear train (9) including an external sun gear (14), a small and a large internal sun gear (16, 17) and a double satellite carrier (11). The first satellite (12) meshes with the small internal sun gear (16) and with the second satellite (13) which meshes with the large internal sun gear (17) and with the external sun gear (14). Two clutches (18, 19) for securing the single satellite carrier (7) to the small and large internal sun gear (16, 17), respectively, are kept open. A brake (24) for immobilizing the double satellite carrier (11) is kept engaged. The invention applies to controlling such a gear box when the vehicle is stopped. |
