Method for operating a parallel hybrid powertrain of a vehicle with at least one internal combustion engine and at least one electric motor
First Claim
1. A method for operating a parallel hybrid powertrain (1) of a vehicle to minimize torque fluctuations in an output of the powertrain caused by starting a combustion engine, the parallel hybrid powertrain comprising at least one internal combustion engine (2) and at least one electric motor (3), the electric motor (3) being located in the powertrain between the internal combustion engine (2) and the output of the powertrain (1), a frictionally engaged shifting element (5) being located between the internal combustion engine (2) and the electric motor (3), a starting element (6), comprising a hydrodynamic torque converter (6A) and a converter lock-up clutch (6B), being located between the electric motor (3) and the output, and a target output torque (m_fahr_soll) directed to the output being dependent on slippage of the starting element (6), the method comprising the steps of:
- generating an input torque with the electric motor (3); and
directing an amount of the input torque to the combustion engine (2) for starting the internal combustion engine (2);
during a starting phase in which the electric motor (3) starts the internal combustion engine (2);
directing at least a first portion of the input torque to the torque converter (6A);
directing at least a second portion of the input torque to the converter lock-up clutch (6B); and
regulating slippage of the starting element (6) depending on a target input speed (n_3_soll) of the electric motor (3) and a target transmission capacity (m_WK_soll) of the converter lock-up clutch (6B).
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Accused Products
Abstract
A method for operating a parallel hybrid powertrain (1) of a vehicle having one internal combustion engine (2) and one electric motor (3). The electric motor is located in the drivetrain between an output and the internal combustion engine. Between the internal combustion engine and the electric motor, a frictionally engaged shifting element is provided, while between the electric motor and the output, a starting element (6) having a hydrodynamic torque converter (6A) and a converter lock-up clutch (6B) is disposed. A target output torque to be applied to the output is dependent on the slippage of the starting element. During a starting phase of the internal combustion engine via the electric motor, an input torque produced by the electric motor is directed at least in part via the torque converter and in part via the converter lock-up clutch.
41 Citations
20 Claims
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1. A method for operating a parallel hybrid powertrain (1) of a vehicle to minimize torque fluctuations in an output of the powertrain caused by starting a combustion engine, the parallel hybrid powertrain comprising at least one internal combustion engine (2) and at least one electric motor (3), the electric motor (3) being located in the powertrain between the internal combustion engine (2) and the output of the powertrain (1), a frictionally engaged shifting element (5) being located between the internal combustion engine (2) and the electric motor (3), a starting element (6), comprising a hydrodynamic torque converter (6A) and a converter lock-up clutch (6B), being located between the electric motor (3) and the output, and a target output torque (m_fahr_soll) directed to the output being dependent on slippage of the starting element (6), the method comprising the steps of:
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generating an input torque with the electric motor (3); and directing an amount of the input torque to the combustion engine (2) for starting the internal combustion engine (2); during a starting phase in which the electric motor (3) starts the internal combustion engine (2); directing at least a first portion of the input torque to the torque converter (6A); directing at least a second portion of the input torque to the converter lock-up clutch (6B); and regulating slippage of the starting element (6) depending on a target input speed (n_3_soll) of the electric motor (3) and a target transmission capacity (m_WK_soll) of the converter lock-up clutch (6B). - View Dependent Claims (2, 15, 16, 17, 18, 19, 20)
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3. A method for operating a parallel hybrid powertrain (1) of a vehicle with at least one internal combustion engine (2) and at least one electric motor (3), the electric motor (3) being located in the powertrain between the internal combustion engine (2) and an output of the powertrain (1), a frictionally engaged shifting element (5) being located between the internal combustion engine (2) and the electric motor (3), a starting element (6), comprising a hydrodynamic torque converter (6A) and a converter lock-up clutch (6B), being located between the electric motor (3) and the output, and a target output torque (m_fahr_soll) directed to the output being dependent on slippage of the starting element (6), the method comprising the steps of:
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generating an input torque with the electric motor (3); and during a starting phase in which the electric motor (3) starts the internal combustion engine (2); directing at least a first portion of the input torque to the torque converter (6A); and directing at least a second portion of the input torque to the converter lock-up clutch (6B); and determining a target input speed (n_3_soll) of the electric motor (3) and a target transmission capacity (m_WK_soll) of the converter lock-up clutch (6B), as a function of a minimum speed difference (n_diff_min) between an input speed and an output speed of the starting element (6), with the minimum speed difference (n_diff_min) depending on operational state parameters of the parallel hybrid powertrain (1), for producing the target output torque (m_fahr_soll) directed to the output. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification