Method and control unit for carrying out an engine stop of an internal combustion engine
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorsThomas Christ, Dominik Schwarzbach
Life of this patent
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Abstract
A control unit is provided for a vehicle having an internal combustion engine with a shaft, which can be coupled to an electric machine or decoupled from the electric machine. The control unit is designed to couple the electric machine to the internal combustion engine during an engine stop of the internal combustion engine. The control unit causes the electric machine to guide the shaft of the internal combustion engine. The control unit determines that a speed of the guided shaft is equal to or less than a speed threshold value and, in response thereto, decouples the electric machine from the internal combustion engine, such that the internal combustion engine stops without being guided by the electric machine.
Claims19
An apparatus for a vehicle having an internal combustion engine with a shaft which is couplable to an electric machine or is decouplable from the electric machine, comprising:
- a control unit operatively configured to:
- couple the electric machine to the internal combustion engine during an engine stop of the internal combustion engine;
- cause the electric machine to guide the shaft of the internal combustion engine while coupled to the internal combustion engine;
- determine that a rotational speed of the guided shaft is less than or equal to a rotational speed threshold value corresponding to a lower bound of a vibration-relevant rotational speed range of the internal combustion engine;
- and in response,
- decouple the electric machine from the internal combustion engine, such the shaft of the internal combustion engine comes to a standstill without being guided by the electric machine.
A method for carrying out an engine stop of an internal combustion engine of a vehicle, the internal combustion engine comprising a shaft which is couplable to an electric machine or is decouplable from the electric machine;
- the method comprising:
- coupling the electric machine to the internal combustion engine;
- guiding the shaft of the internal combustion engine while coupled to the electric machine;
- determining that a rotational speed of the guided shaft is less than or equal to a rotational speed threshold value corresponding to a lower bound of a vibration-relevant rotational speed range of the internal combustion engine;
- and in response:
- decoupling of the electric machine from the internal combustion engine, such that the internal combustion engine comes to a standstill without being guided by the electric machine.
Dependencies are inferred from the claim text.