METHOD TO CONTROL A HYBRID DRIVE TRAIN
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Abstract
A method of controlling a hybrid drive train of a vehicle having, in series, an internal combustion engine, a clutch, an electric motor and a transmission with an output connected to the drive axle. During traction operation, the vehicle changes from an electric driving mode into a combination driving mode or a combustion engine driving mode, in that the clutch is engaged and the combustion engine torque is temporarily increased. The method includes regulating engagement of the clutch at least until reaching a starting rotational speed of the combustion engine such that the acceleration of the combustion engine occurs according to a predetermined progression of rotational speed and that the torque of the combustion engine is increased by the same amount as the transferable torque of the clutch is increased by the engagement process.
115 Citations
35 Claims
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1-17. -17. (canceled)
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18. A method of controlling a hybrid drive train of a motor vehicle having a serial arrangement of an internal combustion engine (VM), a clutch (K), an electric motor (EM) operating as an engine and a generator, and a drive transmission having an output drivingly connected to a drive axle of the motor vehicle, whereby during traction operation of the motor vehicle a change occurs from an electric driving mode with the internal combustion engine (VM) shut off, the clutch (K) disengaged and the electric motor (EM) in engine operation into either a combination driving mode with the internal combustion engine (VM) in a traction operation, the clutch (K) engaged and the electric motor (EM) in an engine operation or an internal combustion driving mode with the internal combustion engine (VM) in a traction mode, the clutch (K) engaged and the electric motor (EM) shifted to a disconnected state, in that the clutch (K) is engaged and the torque of the internal combustion engine (EM) is temporarily increased, the method comprising the steps of:
regulating engagement of the clutch (K) at least until a starting rotational speed (nStart) of the internal combustion engine (VM) is reached such that acceleration (dnVM/dt) of the internal combustion engine (VM) takes place according to a predetermined progression of rotational speed (nVM(t)) and the torque (MEM) of the internal combustion engine (EM) is increased during this time by a same amount as the transferable torque (MK) of the clutch (K) is increased by the engagement process (dMEM/dt=dMK/dt, Δ
MEM=Δ
MK).- View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method of controlling a hybrid drive train of a motor vehicle during traction operation of the vehicle to change from a purely electrically driving mode to either a purely internal combustion driven mode or a combined driving mode, the drive train comprising, in series, an internal combustion engine (VM), a clutch (K), an electric motor (EM), which is operable as an engine and a generator, and a drive transmission having an output drivingly coupled to a drive axle, when the drive train is in the purely electrically driving mode, the internal combustion engine (VM) is shut off, the clutch (K) is disengaged and the electric motor (EM) is operating as an engine;
- when the drive train is in the purely internal combustion driven mode;
the internal combustion engine (VM) is in a traction operation, the clutch (K) is engaged and the electric motor (EM) is in a disconnected state, and when the drive train is in the combined driving mode, the internal combustion engine (VM) is in a traction operation, the clutch (K) is engaged and the electric motor (EM) is operating as the engine, the method comprising the steps of;regulating engagement of the clutch (K) at least until the internal combustion engine (VM) reaches a starting rotational speed (nStart) such that acceleration (dnVM/dt) of the internal combustion engine (VM) takes place according to a predetermined progression of rotational speed (nVM(t)); and simultaneously increasing torque (MEM) of the electric motor (EM) by a same amount as transferable torque (MK) of the clutch (K) is increased during engagement of the clutch (dMEM/dt=dMK/dt, Δ
MEM=Δ
MK).
- when the drive train is in the purely internal combustion driven mode;
Specification