Method for operating a hybrid powertrain with an electric machine, an internal combustion engine and a variable transmission
AssigneeRobert Bosch GmbH
InventorsLucas Hubertus Johannes Römers, Arjen Brandsma
Life of this patent
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Abstract
The invention relates to a hybrid powertrain in a motor vehicle with an internal combustion engine (1), an electric machine (2), a variable transmission (4) and one or more driven wheels (3). The transmission (4) includes at least a variator unit (9) for varying the output speed of the internal combustion engine (1) and a first differential gearing (5) with three rotary members (51, 54, 53) that are respectively drivingly connected to an output shaft (92) of the variator unit (9), a rotor shaft (21) of the electric machine (2) and a wheel shaft (31) of the driven wheels (3). The invention concerns a method for operating such a hybrid powertrain.
Claims11
A method for operating a hybrid powertrain in a motor vehicle comprising an internal combustion engine (1), an electric machine (2), a driven wheel (3) and a variable transmission (4) there between, which variable transmission (4) is provided with a first differential gearing (5) with three, relatively rotatable members (51, 53, 54) that are respectively intended to be drivingly connected to one of the internal combustion engine (1), the electric machine (2) and the driven wheel (3) and which variable transmission (4) is further provided with a variator unit (9) capable of varying a speed ratio between an input shaft (91) and an output shaft (92), whereof the input shaft (91) is intended to be driven by the internal combustion engine (1) and whereof the output shaft (92) is intended to drive the driven wheel (3) via the first differential gearing (5),
- comprising the steps of:
- running the internal combustion engine (1) at a first engine speed, while blocking the driven wheels (3) from rotating and while driving the electric machine (2) in reverse rotation at a first reverse machine speed,
- unblocking the drive wheels (3) and initiating the forward acceleration of the motor vehicle, characterized in that the method further comprises the sequential steps of:
- increasing the speed of the internal combustion engine (1) from the first engine speed to a second engine speed and continuing the forward acceleration of the motor vehicle (3), while continuing to drive the electric machine (2) in reverse rotation,
- changing the rotation of the electric machine from reverse rotation to forward rotation at a first forward machine speed, which first forward machine speed is determined to synchronize the speed of the rotational members (51, 53, 54) of the first differential gearing (5), and of
- blocking the relatively rotatable members (51, 53, 54) of the first differential gearing (5) from rotating relative to one another.
Dependencies are inferred from the claim text.