Method for controlling a motor vehicle drive train
First Claim
1. A method of controlling a motor vehicle drivetrain having an internal combustion engine (2), an electric machine (3) and a transmission (4) which are coupled with one another by a summation gear system (5, 15) with two input elements (6, 7) and one output element (8) and by a bridging clutch (12) made as a friction clutch, in which a first input element is connected, in a rotationally fixed manner, to a crankshaft (9) of the combustion engine (2), a second input element is connected, in a rotationally fixed manner, to a rotor (10) of the electric machine (3) and the output element (8) is connected, in a rotationally fixed manner, to an input shaft (11) of the transmission (4), and in which the bridging clutch (12) is arranged between two elements of the summation gear system (5, 15), and the method comprising the steps of:
- synchronizing with the electric machine (3), when the bridging clutch (12) is disengaged, a speed difference existing between the combustion engine (2) and the input shaft (11) of the transmission (4) and, at a beginning of the synchronization, bringing the bridging clutch (12) to a contact point before the electric machine (3) is assisted by engagement of the bridging clutch (12) by a controlled engagement of the bridging clutch (12).
1 Assignment
0 Petitions
Accused Products
Abstract
A method for controlling a motor vehicle drive train including a combustion engine, an electric machine and a transmission, which are coupled by a summation gear system, having two input and one output elements, and a clutch. One input element is coupled to the crankshaft of the combustion engine, the other input element is coupled to the rotor of the electric machine and the output element is coupled to the input shaft of the transmission and the clutch is arranged between two elements of the summation gear system, such that when the clutch is disengaged a speed difference between the combustion engine and the transmission input shaft is synchronized by the electric machine and, if necessary, by a controlled engagement of the clutch. To improve synchronization, at the beginning of the synchronization the clutch is brought to its contact point before the engagement of the bridging clutch.
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Citations
6 Claims
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1. A method of controlling a motor vehicle drivetrain having an internal combustion engine (2), an electric machine (3) and a transmission (4) which are coupled with one another by a summation gear system (5, 15) with two input elements (6, 7) and one output element (8) and by a bridging clutch (12) made as a friction clutch, in which a first input element is connected, in a rotationally fixed manner, to a crankshaft (9) of the combustion engine (2), a second input element is connected, in a rotationally fixed manner, to a rotor (10) of the electric machine (3) and the output element (8) is connected, in a rotationally fixed manner, to an input shaft (11) of the transmission (4), and in which the bridging clutch (12) is arranged between two elements of the summation gear system (5, 15), and the method comprising the steps of:
synchronizing with the electric machine (3), when the bridging clutch (12) is disengaged, a speed difference existing between the combustion engine (2) and the input shaft (11) of the transmission (4) and, at a beginning of the synchronization, bringing the bridging clutch (12) to a contact point before the electric machine (3) is assisted by engagement of the bridging clutch (12) by a controlled engagement of the bridging clutch (12). - View Dependent Claims (2, 3)
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4. A method of controlling a motor vehicle drive train (1) during synchronization of an internal combustion engine (2) and a transmission (4) of the drive train (1), which further includes an electric machine (3), a clutch (12) and a summation gear system (5, 15) having a first input element (6), a second input element (7) and an output element (8), the first input element (6) is rotationally fixed to a crankshaft (9) of the combustion engine (2), the second input element (7) is rotationally fixed to a rotor (10) of electric machine (3), and the output element (8) is rotationally fixed to an input shaft (11) of the transmission (4), the method comprising the steps of:
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accelerating rotation of the input shaft (11) of the transmission (4) with the electric machine (3) to reduce a difference between a rotational speed of the input shaft (11) of the transmission (4) and a rotational speed of the crankshaft (9) of the combustion engine (2); simultaneously preparing the clutch (12) for engagement while accelerating rotation of the input shaft (1); and further accelerating rotation of the input shaft (11) of the transmission (4) by engaging the clutch (12). - View Dependent Claims (5, 6)
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Specification