Method for operating a parallel hybrid drive train of a vehicle
First Claim
1. A method of operating a parallel hybrid drive train (1) of a vehicle including an internal combustion engine (2), an electric engine (3) located between the internal combustion engine (2) and an output (5), a first frictionally engaged shifting element (8) located between the electric engine (3) and the output (5) and a second frictionally engaged shifting element (7) located between the internal combustion engine (2) and the electric engine (3), comprising the steps of:
- adjusting a nominal output torque (m_fahr_soll) on the output (5) by adjusting the transmitting capacity of the first shifting element (8) under control according to the required nominal output torque (m_fahr_soll) so that the first shifting element (8) has a transmitting capacity required for providing the nominal torque (m_fahr_soll) on the output (5),adjusting an input rotational speed (n_3) of the electric engine (3) under regulation during a starting process of the internal combustion engine (2) to maintain the first shifting element (8) in a slip operation and to provide the nominal output torque (m_fahr_soll) on the output (5) during at least the starting process of the internal combustion engine (2), includingduring the starting process of the internal combustion engine (2),adjusting the input rotational speed (n_3) of the electric engine (3) according to at least one of the nominal output torque (m_fahr_soll) on the output, a controlled standard (m_7) of the transmitting capacity of the second shifting element (7) and a regulation divergence between a nominal standard (d_omg_soll) of a slip of the first shifting element (8) and an actual slip (omg_ist) of the first shifting element (8), andadapting control portions of a nominal standard of the input torque (m_3) of the electric engine (3) by way of correction control blocks (K2, K3) to an actual operating state of the parallel hybrid drive train (1).
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Accused Products
Abstract
A method is described for operating a parallel hybrid device train (1) of a vehicle having an internal combustion engine (2), an electric engine (3) and an output (5) wherein the electric engine (3) is disposed in the power train between the output (5) and the internal combustion engine (2) and both between the internal combustion engine (2) and the electric engine (3) and between the electric engine (3) and the output (5) is respectively provided a frictionally engaged shifting element (7, 8). In addition, a nominal output torque abutting on the output (5) can be adjusted according to the transmitting capacity of the first shifting element (8) located between the electric engine (3) and the output (5). According to the invention, the transmitting capacity of the first shifting element (8) is adjusted under control according to the nominal input torque required so that the first shifting element (8) has a transmitting capacity needed for producing the nominal output torque on the output (5). Furthermore, an input rotational speed of the electric engine (3) is adjusted under regulation during a starting process of the internal combustion engine (2) in order to keep the first shifting element in slip operation at least during the starting process of the internal combustion engine (2) and to produce the nominal output torque on the output (5).
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Citations
13 Claims
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1. A method of operating a parallel hybrid drive train (1) of a vehicle including an internal combustion engine (2), an electric engine (3) located between the internal combustion engine (2) and an output (5), a first frictionally engaged shifting element (8) located between the electric engine (3) and the output (5) and a second frictionally engaged shifting element (7) located between the internal combustion engine (2) and the electric engine (3), comprising the steps of:
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adjusting a nominal output torque (m_fahr_soll) on the output (5) by adjusting the transmitting capacity of the first shifting element (8) under control according to the required nominal output torque (m_fahr_soll) so that the first shifting element (8) has a transmitting capacity required for providing the nominal torque (m_fahr_soll) on the output (5), adjusting an input rotational speed (n_3) of the electric engine (3) under regulation during a starting process of the internal combustion engine (2) to maintain the first shifting element (8) in a slip operation and to provide the nominal output torque (m_fahr_soll) on the output (5) during at least the starting process of the internal combustion engine (2), including during the starting process of the internal combustion engine (2), adjusting the input rotational speed (n_3) of the electric engine (3) according to at least one of the nominal output torque (m_fahr_soll) on the output, a controlled standard (m_7) of the transmitting capacity of the second shifting element (7) and a regulation divergence between a nominal standard (d_omg_soll) of a slip of the first shifting element (8) and an actual slip (omg_ist) of the first shifting element (8), and adapting control portions of a nominal standard of the input torque (m_3) of the electric engine (3) by way of correction control blocks (K2, K3) to an actual operating state of the parallel hybrid drive train (1). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification