US 2008/0189018 A1Published application

Method for operating a hybrid drive train of a motor vehicle

AssigneeDaimler AG

InventorsJurgen Lang, Klaus Riedl

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Abstract

In a method of operating a hybrid drive train for a motor vehicle including an internal combustion engine, an electric machine and a transmission, a first clutch arranged between the internal combustion engine and the transmission and the electric machine being arranged in parallel with the first clutch and being connectable to the internal combustion engine by way of a second clutch and to the transmission via a third clutch, the electric machine is connected by means of the second and third clutches to the internal combustion engine and to the transmission for assisting the first clutch transmitting an excessive engine torque, and upon failure of the first clutch, for starting movement of the motor vehicle, the third clutch is engaged and the electric machine is energized for transferring an electric machine torque to the transmission and the second clutch is engaged when the vehicle has reached a speed corresponding to the engine speed.

Claims2

Dependent claims

A method for operating a hybrid drive train of a motor vehicle, said drive train including

an internal combustion engine (11),
a transmission (15, 115),
a first clutch (NAK) arranged between the internal combustion engine (11) and the transmission (15, 115),
an electric machine (28),
means for connecting the electric machine to the drive train including a second clutch (KM) for connecting the electric machine to the internal combustion engine (11) without the interposition of the first clutch (NAK), and
a third clutch (KE) for connecting the electric machine to the transmission (15, 115) without the interposition of the first clutch (NAK),
said method comprising the steps of:
transmitting selectively a part of the torque of the internal combustion engine (11) via the second clutch (KM), the electric machine (28) and the third clutch (KE) to the transmission (15, 115), in order to assist the first clutch (NAK) or
in the event of a fault being detected in the first clutch (NAK) in the driving mode,
connecting the electric machine (28) by means of the second clutch (KM) to the internal combustion engine (11) and by means of the third clutch (KE) to the transmission (15, 115).

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/070,390Filed 15 Feb 2008
Priority: DE 10 2005 039 461.220 Aug 2005
Published: 7 Aug 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification28 codes

B60W 20/40
Control systems specially adapted for hybrid vehicles: controlling the engagement or disengagement of prime movers, e.g. for transition between…
B60K 6/387
Characterised by the driveline clutches: actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
B60K 6/48
Characterised by the architecture of the hybrid electric vehicle: parallel type
B60K 6/547
Transmission for changing ratio: the transmission being a stepped gearing

Family

Application12/070,390Continuation in part
US 8,352,135 B2Related patent
US 2008/0189018 A1This patent

From the US filing history. Foreign family members aren’t listed.

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