US 12,013,029 B2
Method for operating a dual clutch transmission of a motor vehicle and motor vehicle
Enrico Szeppat, Lunzenau OT Göritzhain (DE); and Lutz Gundlach, Ingolstadt (DE)
Assigned to AUDI AG, Ingolstadt (DE)
Appl. No. 17/772,302
Filed by AUDI AG, Ingolstadt (DE)
PCT Filed Jun. 17, 2020, PCT No. PCT/EP2020/066697
§ 371(c)(1), (2) Date Apr. 27, 2022,
PCT Pub. No. WO2021/094003, PCT Pub. Date May 20, 2021.
Claims priority of application No. 102019130482.2 (DE), filed on Nov. 12, 2019.
Prior Publication US 2022/0373078 A1, Nov. 24, 2022
Int. Cl. F16H 61/00 (2006.01)
CPC F16H 61/0059 (2013.01) 12 Claims
OG exemplary drawing
 
1. A method for operating a dual-clutch transmission of a motor vehicle, having a first partial transmission having both an input shaft and a side shaft, a second partial transmission, a first clutch assigned to the first partial transmission, and a second clutch assigned to the second partial transmission, in which the dual-clutch transmission is switched to a parking lock state, wherein the dual-clutch transmission is shifted into the parking lock state by the following steps:
while a first gear of the first partial transmissions is engaged:
carrying out an engagement process provided for engaging a second gear of the first partial transmission;
determining that the second gear is not being engaged despite the engagement process being carried out;
selecting a third gear of the dual-clutch transmission different from the first gear and from the second gear; and
engaging the selected third gear, so that in the parking lock state, the first gear and the third gear are at least temporarily engaged simultaneously,
wherein in the parking lock state, the first gear is engaged in that a first gear wheel of the first gear, configured as an idler wheel and rotatably arranged on the side shaft of the dual-clutch transmission, is connected in a rotationally-fixed manner to the side shaft by a first shifting element, which is assigned to the first gear, is arranged on the side shaft, and is connected in a rotationally-fixed manner to the side shaft, wherein the third gear is engaged in that a second gearwheel of third gear, configured as an idler wheel and rotatably arranged on the input shaft of the dual-clutch transmission, is connected in a rotationally-fixed manner to the input shaft by a second shifting element, which is assigned to the third gear, is arranged on the input shaft, and is connected in a rotationally-fixed manner to the input shaft, and the side shaft and the input shaft.