Method for controlling a twin-clutch transmission
AssigneeGetrag Ford Transmissions GmbH
InventorsChristian Krauss, Michael Schwekutsch
Life of this patent
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Abstract
The invention concerns a method of controlling a twin-clutch transmission (10). When the torque transmitted in a first transmission path (C1, E2, Z8, Z9, S2, Z3, Z4) reaches an upper limit given by the torque transmission capacity of that path further additional torque produced by an engine at the drive shaft (I) is transmitted by closure of the second clutch (C2) to the output shaft (O) in parallel relationship by way of a second transmission path (C2, E1, Z1, Z2, S1, Z3, Z4). That permits the output of the engine to be better utilised and makes it possible to achieve better travel characteristics.
Claims10
A method of controlling a twin-clutch transmission (10), wherein torque is transmitted from a drive shaft (I) to an output shaft (O) via a first clutch (C1) and via a first transmission path (E2, Z8, Z9, S2, Z3, Z4), and with a second clutch C2) being at least partially closed in order to transmit an additional torque from the drive shaft (I) to the output shaft (O) via a second transmission path (E1, Z1, Z2, S1, Z3, Z4;
- E1, Z5, Z6, S3, Z7) when the torque transmitted by way of the first clutch (C1) reaches a predetermined upper limit;
- said method comprising the steps of:
- comparing torque (MMot) provided by an engine with a current permissible upper limit for a selected gear and an operating mode of the transmission, said current permissible upper limit being selected to ensure that the first transmission path is protected from a torque overload;
- and
- diverting an excess component of the torque (MMot) via the second transmission path responsive to said current permissible upper limit being exceeded.
A twin-clutch transmission (10) comprising:
- at least a first clutch (C1) and a second clutch (C2) for the transmission of torque from a drive shaft (I) to an output shaft (O) respectively via a first transmission path (E2, Z8, Z9, S2, Z3, Z4), and a second transmission path (E1, Z1, Z2, S1, Z3, Z4;
- E1, Z5, Z6, S3, Z7), and a controller for actuation of the clutches,
- said controller for comparing torque (MMot) provided by an engine with a current permissible upper limit for a selected gear and an operating mode of the transmission, said current permissible upper limit being selected to ensure that the first transmission path is protected from a torque overload;
- and for controlling said second clutch (C2),
- said controller for diverting an excess component of the torque (MMot) via the second transmission path responsive to said current permissible upper limit being exceeded.
Dependencies are inferred from the claim text.