Patent EP-3161354-A1 (EP)
Inventor: KARPENMAN FREDRIK
IPC: F16H61/688
Filed: 2014-06-24
Abstract: The invention relates to a method for controlling a drivetrain of a vehicle, wherein said drive train comprises a combustion engine (20) in drive connection with a dual clutch transmission (200), wherein said dual clutch transmission (200) is provided with a normally closed input clutch (10a, 10b), a normally open input clutch (11a; 11b), wherein said normally closed input clutch (10a, 10b) connecting said combustion engine (20) with a first input shaft (12a, 12b) and said normally open input clutch (11a; 11b) connecting said combustion engine (CE) with a second input shaft (13a, 13b) and said first input shaft (12a, 12b) is in operative connection with a connection sleeve (20a; 20b, 21b), wherein said connection sleeve (20a; 20b, 21 b) can be arranged in an engaged and a disengaged position, whereby in said engaged position said connection sleeve (20a; 20b, 21b) enables an operative connection between said first input shaft (12a, 12b) to a gearwheel (40a, 41a; 40b, 41b) and in said disengaged position gearwheel is disconnected from said first input shaft (12a, 12b) and said connection sleeve (20a; 20b, 21b) is in a disengaged position when said drivetrain is turned off, wherein the method is automatically initiated at start of said drivetrain, and comprising the steps of; starting said combustion engine (20), The invention relates to a method for controlling a drivetrain of a vehicle, wherein said drive train comprises a combustion engine (20) in drive connection with a dual clutch transmission (200), wherein said dual clutch transmission (200) is provided with a normally closed input clutch (10a, 10b), a normally open input clutch (11a; 11 b), wherein said normally closed input clutch (10a, 10b) connecting said combustion engine (20) with a first input shaft (12a, 12b) and said normally open input clutch (11a; 11b) connecting said combustion engine (CE) with a second input shaft (13a, 13b) and said first input shaft (12a, 12b) is in operative connection with a connection sleeve (20a; 20b, 21b), wherein said connection sleeve (20a; 20b, 21b) can be arranged in an engaged and a disengaged position, whereby in said engaged position said connection sleeve (20a; 20b, 21 b) enables an operative connection between said first input shaft (12a, 12b) to a gearwheel (40a, 41a; 40b, 41b) and in said disengaged position gearwheel is disconnected from said first input shaft (12a, 12b) and said connection sleeve (20a; 20b, 21b) is in a disengaged position when said drivetrain is turned off, wherein the method is automatically initiated at start of said drivetrain, and comprising the steps of; starting said combustion engine (20), controlling said normally open and said normally closed input clutch (10a, 10b, 11a, 11b) to an engaged or semi engaged state such that both said first and said second input shaft (12a, 12b; 13a, 13b) reaches a predetermined synchronised speed (CEidle), and thereafter opening said normally closed input clutch (10a, 10b), and when said countershaft sleeve (20b, 21b) reaches an essentially synchronous speed with said gearwheel (40a, 41a; 40b, 41b) engaging said connection sleeve (20a; 20b, 21 b). controlling said normally open and said normally closed input clutch (10a, 10b, 11a, 11b) to an engaged or semi engaged state such that both said first and said second input shaft (12a, 12b; 13a, 13b) reaches a predetermined synchronised speed (CEidle), and thereafter opening said normally closed input clutch (10a, 10b), and when said countershaft sleeve (20b, 21b) reaches an essentially synchronous speed with said gearwheel (40a, 41a; 40b, 41 b) engaging said connection sleeve (20a; 20b, 21b).