Zf Friedrichshafen Ag

Mannesmann Sachs Ag

Mario Bühner

Markus Terwart

Martin-Joachim Bader

Karl Locher

Olaf Moseler

Dietmar Zuber

Lutz Leimbach

Thomas John

Jens Dorfschmid

Udo Borschert

Hans-Jürgen Schneider

Method for shifting a neutral state of an automatic multi-stage transmission of a motor vehicle, where, to engage and to disengage gear stages of the transmission, shift couplings, at least one of which is equipped with a synchronizing device, can be actuated by a transmission actuator.

Method for shifting a neutral state of an automatic multi-stage transmission

A method for determination of the synchronization point of an automatic double clutch transmission comprising two component transmissions each with one input shaft that connects via a friction clutch to the drive shaft of a motor and several gears, each shifted via a friction-synchronized gear clutch. The method includes the steps of selecting the gear clutch of a gear of a momentarily load-free component transmission; moving the associated gear setter to the neutral position as needed; successive movement of the associated gear setter in the direction of the shifting position of the selected gear until synchronous running is attained on the gear clutch within an applicable threshold; determination of the current synchronization point of the gear clutch from the current adjustment parameter of the associated gear setter; and adaptation of the valid synchronization point of the gear clutch to the current synchronization point.

Synchronous state determination method for automatic dual clutch transmission

A method for clutch characteristic curve adaptation of an automatic dual-clutch transmission which comprises two sub-gearboxes each with an input shaft connected, via a friction clutch, to the drive shaft of a motor and several gears that are shifted via a friction-synchronized gear clutch. A value of the current touch point of the friction clutch can be determined with the motor running and the gears disengaged in a load-free sub-gearbox. The method includes the steps of starting synchronization of a gear clutch with a defined force of a regulator. Waiting until the gear clutch is synchronized. Engaging the friction clutch of the until the gear clutch is synchronizes. Determination the current touch point from the current synchronous torque of the gear clutch and the current regulating parameter of the associated clutch regulator. Then, adapting the clutch characteristic curve of the friction clutch in view of the current touch point.

Clutch characteristic adaption method for automatic dual clutch transmission

An actuating device for automatically actuating a manual transmission, which has an output element that can be driven in a first direction by a first drive and in a second direction by a second drive. Each drive is assigned a sensor which displays an actuating movement and detects a movement if the output element and whose signals are fed to a control device. In the case of a movement of the output element the sensors output to the control device signals assigned to this movement, the signals specifying the respective magnitude of the movement. The control device uses the signals with reference to an arbitrary prescribable reference point to determine the actual position of the output element and relate the actual position to a desired position of the output element which is to be approached, with the perception that the desired position has not been reached after termination of an actuating movement, or the absence of the signals which indicate the actuating movement causing the control device to activate an emergency function.

Actuating device for automatically actuating a manual transmission

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Gerolzhofen, Germany

Mario Bühner