Method to control a hybrid drive train
First Claim
1. 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, the method comprising the steps of:
- during a traction operation of the motor vehicle, initiating a change 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, to one of 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, and 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,initiating engagement of the clutch (K)temporarily increasing the torque of the electric motor (EM)regulating engagement of the clutch (K), during engagement, at least until a starting rotational speed (nStart) of the internal combustion engine (VM) is reached,moderating acceleration of the internal combustion engine (VM) according to a predetermined progression of rotational speed (nVM(t)) via, at least, the regulation of clutch engagement;
increasing a transferable torque (MK) of the clutch (K) through engagement of the clutch (K); and
increasing a torque (MEM) of the electric motor (EM) concurrently, by an equal magnitude, and at an equal rate as the transferable torque (MK) of the clutch (K) is increased, such that a derivative of the torque (MEM) of the electric motor (EM) with respect to time is equal to a derivative of the transferable torque (MK) of the clutch (K) with respect to time and a change in the torque (MEM) of the electric motor (EM) is equal to a change in the transferable torque (MK) of the clutch (K).
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Accused Products
Abstract
A method of controlling a hybrid drive train of a vehicle which comprises, 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 electric 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.
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Citations
18 Claims
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1. 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, the method comprising the steps of:
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during a traction operation of the motor vehicle, initiating a change 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, to one of 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, and 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, initiating engagement of the clutch (K) temporarily increasing the torque of the electric motor (EM) regulating engagement of the clutch (K), during engagement, at least until a starting rotational speed (nStart) of the internal combustion engine (VM) is reached, moderating acceleration of the internal combustion engine (VM) according to a predetermined progression of rotational speed (nVM(t)) via, at least, the regulation of clutch engagement; increasing a transferable torque (MK) of the clutch (K) through engagement of the clutch (K); and increasing a torque (MEM) of the electric motor (EM) concurrently, by an equal magnitude, and at an equal rate as the transferable torque (MK) of the clutch (K) is increased, such that a derivative of the torque (MEM) of the electric motor (EM) with respect to time is equal to a derivative of the transferable torque (MK) of the clutch (K) with respect to time and a change in the torque (MEM) of the electric motor (EM) is equal to a change in the transferable torque (MK) of the clutch (K). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of controlling a hybrid drive train of a motor vehicle during traction operation of the vehicle to change from an exclusively electrically driving mode to either an exclusively internal combustion driving 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, the method comprising the steps of:
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shutting off the internal combustion engine (VM), disengaging the clutch (K), and operating the electric motor (EM) as an engine when the drive train is in the exclusively electrically driving mode; operating the internal combustion engine (VM) in a traction state, engaging the clutch (K) and operating the electric motor (EM) in a disconnected state when the drive train is in the exclusively internal combustion driving mode; and operating the internal combustion engine (VM) in a traction state, engaging the clutch (K) and operating the electric motor (EM) as an engine when the drive train is in the combined driving mode; regulating engagement of the clutch (K), at least until the internal combustion engine (VM) reaches a starting rotational speed (nStart), such that acceleration of the internal combustion engine (VM) takes place according to a predetermined progression of rotational speed (nVM(t)); and simultaneously, during engagement of the clutch, increasing torque (MEM) of the electric motor (EM) and transferable torque (MK) of the clutch (K) by a same amount and at a same rate such that a derivative of the torque (MEM) of the electric motor (EM), with respect to time, is equal to a derivative of the transferable torque (MK) of the clutch (K), with respect to time, and a change in the torque (MEM) of the electric motor (EM) is equal to a change in the transferable torque (MK) of the clutch (K).
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Specification