US 10,293,814 B2Granted

Method and control unit for a motor vehicle

AssigneeZF Friedrichshafen AG

InventorsFelix Bühle, Thomas Lemp

Life of this patent

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Abstract

A method for operating a motor vehicle originates from a condition in which a torque converter lockup clutch (6) or a master clutch (13) is engaged and the transmission (2) is friction-locking. The torque converter lockup clutch (6) or the master clutch (13) is then brought into a slip condition on a control side, and a prime-mover rotational speed is decoupled from a driven-end rotational speed. The torque converter lockup clutch (6) or the master clutch (13) is brought into the slip condition without reducing a pressure control of the torque converter lockup clutch (6) or the master clutch (13) and by specifying a target rotational speed or a target torque for the prime mover (1) such that a torque or a target torque is greater than a power transmission capacity of the torque converter lockup clutch (6) or the master clutch (13) and slip is built up.

Claims12

Dependent claims

A method for operating a motor vehicle including a prime mover (1), a driven end (3) and a transmission (2), the transmission (2) connected between the prime mover (1) and the driven end (3), the transmission (2) including a starting component (4), the starting component (4) being either a torque converter (5) with a torque converter lockup clutch (6) or a master clutch (13) that is transmission-internal or transmission-external, the method comprising:

during a condition in which the torque converter lockup clutch (6) or the master clutch (13) is engaged and the transmission (2) is friction-locking such that a rotational speed of the prime-mover (1) is coupled to a rotational speed of the driven-end (3), bringing the torque converter lockup clutch (6) or the master clutch (13) into a slip condition in response to an event requiring an increase in the rotational speed of the prime-mover (1), the rotational speed of the prime-mover (1) decoupled from the rotational speed of the driven-end (3) in the slip condition, the rotational speed of the prime-mover (1) increasing after bringing the torque converter lockup clutch (6) or the master clutch (13) into the slip condition,
wherein the torque converter lockup clutch (6) or the master clutch (13) is brought into the slip condition without reducing a pressure control for the torque converter lockup clutch (6) or the master clutch (13), the pressure control determining a power transmission capacity of the torque converter lockup clutch (6) or the master clutch (13), and
wherein the torque converter lockup clutch (6) or the master clutch (13) is brought into the slip condition by specifying a target rotational speed or a target torque for the prime mover (1) such that a torque dependent on the target rotational speed or the target torque is greater than the power transmission capacity of the torque converter lockup clutch (6) or the master clutch (13).

A transmission control unit for a motor vehicle with a prime mover (1), a driven end (3) and a transmission (2), the transmission (2) connected between the prime mover (1) and the driven end (3), the transmission (2) including a starting component (4), the starting component (4) being either a torque converter (5) with a torque converter lockup clutch (6) or a master clutch (13) that is transmission-internal or transmission-external, the transmission control unit programmed to:

during a condition in which the torque converter lockup clutch (6) or the master clutch (13) is engaged and the transmission (2) is friction-locking such that a rotational speed of the prime-mover (1) is coupled to a rotational speed of the driven-end (3), bring the torque converter lockup clutch (6) or the master clutch (13) into a slip condition on a control side in response to an event requiring an increase in the rotational speed of the prime-mover (1), the rotational speed of the prime-mover (1) decoupled from the rotational speed of the driven-end (3) in the slip condition on the control side, the rotational speed of the prime-mover (1) increasing after bringing the torque converter lockup clutch (6) or the master clutch (13) into the slip condition;
bring the torque converter lockup clutch (6) or the master clutch (13) into the slip condition on the control side without reducing a pressure control for the torque converter lockup clutch (6) or the master clutch (13), the pressure control determining a power transmission capacity of the torque converter lockup clutch (6) or the master clutch (13);
and
bring the torque converter lockup clutch (6) or the master clutch (13) into the slip condition on the control side by specifying a target rotational speed or a target torque for the prime mover (1) such that a torque dependent on the target rotational speed or the target torque is greater than the power transmission capacity of the torque converter lockup clutch (6) or the master clutch (13).

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 16/002,529Filed 7 Jun 2018
Priority: DE 10 2017 209 6538 Jun 2017
Published: US 2018/0354498 A113 Dec 2018
Granted: 21 May 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification33 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 6/485
Parallel type: motor-assist type