초록

A method for starting the internal combustion engine, in parallel hybrid vehicles, in which the internal combustion engine is started, during a shift under load in purely electric driving operation, by the electric machine.

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1. A method of starting an internal combustion engine in a parallel hybrid vehicle in which the internal combustion engine (1) is connectable by a first clutch (K1) to an electric machine (2) which is connected to a transmission (3), the method comprising the steps of: transmitting torque, via the f

1. A method of starting an internal combustion engine in a parallel hybrid vehicle in which the internal combustion engine (1) is connectable by a first clutch (K1) to an electric machine (2) which is connected to a transmission (3), the method comprising the steps of: transmitting torque, via the first clutch (K1), as a pilot torque to a speed regulator of the electric machine (2) such that torque of the internal combustion engine (1) is used as the pilot torque for the speed regulator when the first clutch (K1) catches;utilizing torques of an old clutch (K_alt) and a new clutch (K_neu), which are involved in a shift under load and acting upon the electric machine (2), as further pilot torques for speed regulation;adapting a speed of the electric machine (2), during a speed regulation mode, for synchronization with a new gear during the shift under load;engaging a first clutch (K1), during the shift under load, and starting the internal combustion engine (1) during the adaptation of the speed of the electric machine (2) and during the shift under load, in a purely electrical driving operation, via the electric machine (2). 2. The method of starting the internal combustion engine according to claim 1, further comprising the step of adapting the speed of the electric machine (2) such that the speed (n_EM) of the electric machine (2) approaches a target speed (n_Gang_neu) with a desired gradient. 3. The method of starting the internal combustion engine according to claim 2, further comprising the step of, when the speed (n_EM) of the electric machine (2) reaches one of the target speed or a synchronous speed (n_Gang_neu) of the new gear being engaged, changing the electric machine (2) to a torque-regulated mode and completely engaging the new clutch (K_neu). 4. The method of starting the internal combustion engine according to claim 1, further comprising the step of utilizing a mass moment of inertia of the electric machine (2) as a starting torque for the internal combustion engine during an upshift. 5. The method of starting the internal combustion engine according to claim 1, further comprising the steps of reducing, in a traction downshift, a transmission capacity of the old clutch (K_alt) which is to be disengaged;changing the electric machine (2) from a torque-controlled mode to the speed-regulation mode as soon as slip is detected at the old clutch (K_alt) being disengaged;adjusted the speed of the electric machine (2) to a value higher than a synchronous speed at the new clutch (K_neu) being engaged; andincreasing a transmission capacity of the new clutch (K_neu) being engaged and further reducing the transmission capacity of the old clutch (K_alt) being disengaged, to facilitate a continuous load transfer to the new clutch (K_neu) being engaged, such that when the new clutch (K_neu) assumes the load, the old clutch (K_alt) being disengaged is completely disengaged and the speed of the electric machine (2) is adjusted to the synchronous speed at the new clutch (K_neu) being engaged. 6. The method of starting the internal combustion engine according to claim 1, further comprising the step of: approximately simultaneously increasing, in a thrust downshift, a transmission capacity of the new clutch (K_neu) to be engaged and reducing a transmission capacity of the old clutch (K_alt) to be disengaged; andchanging the electric machine (2) from a torque-controlled mode to the speed-regulation mode when the new clutch (K_neu) being engaged assumes the load and the old clutch (K_alt) being disconnected is disengaged completely, and adjusting the electric machine (2) under speed control to a synchronous speed at the new clutch (K_neu) and at approximately the same time the old clutch (K_alt) being disconnected is completely disengaged. 7. A method of starting an internal combustion engine in a parallel hybrid vehicle in which the internal combustion engine (1) is connectable by a first clutch (K1) to an electric machine (2) which is connected to a transmission (3), the method comprising the steps of: adapting a speed of the electric machine (2), during a speed regulation mode, for synchronization with a new gear during the shift under load;engaging a first clutch (K1), during the shift under load, and starting the internal combustion engine (1) during the adaptation of the speed of the electric machine (2) and during the shift under load, in a purely electrical driving operation, via the electric machine (2);approximately simultaneously increasing, in a traction upshift, a transmission capacity of a new clutch (K_neu) to be engaged for load transfer and reducing a transmission capacity of an old clutch (K_alt) to be disengaged; andchanging the electric machine (2) to a speed regulation mode when the load transfer to the new clutch (K_neu) occurs, adapting the speed of the electric machine (2) to reach a synchronous speed of the new gear being engaged such that the electric machine (2) is adjusted under speed control to either a target speed or the synchronous speed of the new gear, while approximately simultaneously completely disengaging the old clutch (K_alt). 8. A method of starting an internal combustion engine in a parallel hybrid vehicle in which the internal combustion engine (1) is connectable by a first clutch (K1) to an electric machine (2) which is connected to a transmission (3), the method comprising the steps of: adapting a speed of the electric machine (2), during a speed regulation mode, for synchronization with a new gear during the shift under load;engaging a first clutch (K1), during the shift under load, and starting the internal combustion engine (1), during the adaptation of the speed of the electric machine (2) and during the shift under load, in a purely electrical driving operation, via the electric machine (2);continuously reducing, in a thrust upshift, a transmission capacity of an old clutch (K_alt) to be disengaged;changing the electric machine (2) from a torque-controlled mode to a speed-regulation mode as soon as slip is detected at the old clutch (K_alt) being disengaged, in which the speed of the electric machine (2) is reduced to a value below the synchronous speed at a new clutch (K_neu) to be engaged;increasing a transmission capacity of the new clutch (K_neu) being engaged and reducing the transmission capacity of the old clutch (K_alt) being disengaged to transfer continuously the load to the new clutch (K_neu); andcompletely disengaging the old clutch (K_alt) being disengaged after the load is assumed by the new clutch (K_neu) being engaged and the speed of the electric machine (2) is adjusted in the speed-regulation mode to the synchronous speed at the new clutch (K_neu) being engaged.