Hybrid drive system
AssigneeMercedes-Benz Group AG
InventorTobias Schilder
Life of this patent
Estimating the term…
Abstract
A hybrid drive system has an internal combustion engine having a crankshaft, an electric motor having a rotor and a stator, a dual clutch transmission having an input shaft, a dual claw clutch having a first claw clutch and a second claw clutch, a first sub-transmission, and a second sub-transmission. The first claw clutch is non-rotatably connects a first sub-transmission input shaft of the first sub-transmission to the input shaft. The second claw clutch non-rotatably connects a second sub-transmission input shaft of the second sub-transmission to the input shaft. The rotor is arranged in such a way that torques starting from the rotor on an output side of the second claw clutch can be introduced into the dual clutch transmission via the second sub-transmission input shaft.
Claims5
A hybrid drive system, comprising:
- an internal combustion engine comprising a crankshaft;
- an electric motor comprising a rotor and a stator;
- and
- a dual clutch transmission comprising an input shaft, a first sub-transmission, a second sub-transmission, and a dual claw clutch comprising a first claw clutch and a second claw clutch,
- wherein the first sub-transmission comprises a first gear clutch and a third gear clutch,
- wherein the second sub-transmission comprises a second gear clutch,
- wherein the first claw clutch non-rotatably connects a first sub-transmission input shaft of the first sub-transmission to the input shaft,
- wherein the second claw clutch non-rotatably connects a second sub-transmission input shaft of the second sub-transmission to the input shaft,
- wherein the rotor is configured in such a way that torques starting from the rotor on a secondary side of the second claw clutch are introducible into the dual clutch transmission via the second sub-transmission such that the torques starting from the rotor, with respect to a torque flow starting from the internal combustion engine, are only introduced into the dual clutch transmission downstream of the dual claw clutch,
- wherein the electric motor is the only motor of the hybrid drive system,
- wherein a separating clutch, which is a frictionally engaged clutch, non-rotatably connects the crankshaft to the input shaft,
- wherein the first sub-transmission comprises a first central gear arranged coaxially with the first sub-transmission input shaft, a first gearwheel arranged coaxially with a first countershaft, and a third gearwheel arranged coaxially with a second countershaft,
- wherein the first central gear and the first gearwheel form a first switchable spur gear pair, and the first gear clutch is configured to couple the first sub-transmission input shaft to the first countershaft via the first switchable spur gear pair in a torque-transmitting manner,
- wherein the second sub-transmission comprises a second central gear arranged coaxially with the second sub-transmission input shaft, and a second gearwheel arranged coaxially with the second countershaft, and
- wherein the second central gear and the second gearwheel form a second switchable spur gear pair, and the second gear clutch is configured to couple the second sub-transmission input shaft in a torque-transmitting manner to the second countershaft via the second switchable spur gear pair.
A method for switching a hybrid drive system, which comprises an internal combustion engine comprising a crankshaft;
- an electric motor comprising a rotor and a stator;
- and a dual clutch transmission comprising an input shaft, a first sub-transmission, a second sub-transmission, and a dual claw clutch comprising a first claw clutch and a second claw clutch, wherein the first sub-transmission comprises a first gear clutch and a third gear clutch, wherein the second sub-transmission comprises a second gear clutch, wherein the first claw clutch non-rotatably connects a first sub-transmission input shaft of the first sub-transmission to the input shaft, wherein the second claw clutch non-rotatably connects a second sub-transmission input shaft of the second sub-transmission to the input shaft, wherein the rotor is configured in such a way that torques starting from the rotor on a secondary side of the second claw clutch are introducible into the dual clutch transmission via the second sub-transmission, wherein the electric motor is the only motor of the hybrid drive system, and wherein a separating clutch, which is a frictionally engaged separating clutch, non-rotatably connects the crankshaft to the input shaft, the method comprising:
- changing a gear of the hybrid drive system by, starting from an internal combustion engine drive in a first gear to an internal combustion engine drive in a second gear, performing at least the following two steps A and B in the sequence mentioned:
- Step A:
- increasing a torque of the electric motor and opening the frictionally engaged separating clutch and engaging an upcoming gear clutch, and
- Step B:
- closing the frictionally engaged separating clutch, increasing a torque of the internal combustion engine, and decreasing the torque of the electric motor.
Dependencies are inferred from the claim text.