Zf Friedrichshafen Ag

Iveco S.p.a.

Wilhelm Moser

Alain Tierry Chamaken Kamde

Mario Steinborn

Rupert Kramer

Markus Eisele

Rachid Mansour

Oliver Buchhold

Vincenzo Abbatantuoni

Disclosed is a method for operating an interlocking shifting element of a transmission of a vehicle, the interlocking shifting element having shifting element halves which can be moved relative to one another when opening and closing the interlocking shifting element. An electric actuator is arranged to about the relative movement between the shifting element halves when the interlocking shifting element is opened and/or closed. After recognizing a tooth-on-tooth position in the interlocking shifting element, a target torque to be applied at the transmission input is determined as a function of an electric current strength through the electric actuator of the interlocking shifting element, where the target torque is sufficient to resolve the tooth-on-tooth position in the interlocking shifting element.

Method and control apparatus for operating a positive shift element of a transmission of a vehicle, transmission and vehicle

The present invention relates to a method for resolving a tooth-on-tooth position of a positive-locking shifting element of an automated manual transmission, in which gear steps of the automated manual transmission are changed by means of a pressure-medium-actuated shift actuator. If, during a change of a gear step of the automated manual transmission, a tooth-on-tooth position occurs at the interlocking shifting element, then the control of the pressure-medium-actuated shift actuator is varied in such manner as to resolve the tooth-on-tooth position. A control unit for carrying out the method is also disclosed.

Method and control unit for resolving a tooth-on-tooth position of a positive-locking shifting element of an automated manual transmission

Disclosed is a method for operating an interlocking shifting element of a transmission of a vehicle, where the interlocking shifting element has shifting element halves which can be moved relative to one another when opening and closing the interlocking shifting element. An electric actuator is arranged to bring about the relative movement between the shifting element halves when opening and/or closing the interlocking shifting element. An electric current strength through the electric actuator is determined and, depending on the electric current strength through the electric actuator, a conclusion is reached about the shifting position of the interlocking shifting element.

A method for operating a pneumatic actuating system of a transmission. The actuating system has an air reservoir at a first pressure. The reservoir couples an actuating space of the actuating system which is at a second pressure, and the actuating space couples, via control valves, shifting cylinders. When conducting a transmission gearshift, an air mass delivered to the active shifting cylinders via corresponding control valves, and an air mass sum including a nominal air mass in the active cylinders required for accomplishing the gearshift and an actual basic leakage from the activated shifting cylinder are determined. A defect leak in the pneumatic actuating system is recognized, if the air mass delivered to the active shifting cylinders is larger than the air mass sum. If a defect leak is recognized, the control valves coupling the actuating space and the shifting cylinders are shut off for a period of time.

Method for operating a pneumatic actuating system of a transmission and control device for carrying out the method

A method for determining an operating force (F) of a positioning actuator (), whose adjustment movements are produced by virtue of an appropriate supply of a working medium via actuating at least one valve (to) associated with the positioning actuator (). The operating force (F) is determined by computational determination. To be able to carry out the computational determination of the operating force (F) with little effort, by the at least one valve (to) in each case, a respective, essentially constant mass flow ({dot over (m)}, {dot over (m)}) of working medium is maintained either into the positioning actuator () and/or out of the positioning actuator ().

Method for determining a control force of an actuator

A method for operating a motor vehicle with an automated gearbox (), which can be connected, via a clutch (), to a prime mover (). The output rotational speed of the gearbox () is detected by sensors and evaluated for plausibility by comparison with an arithmetic mean value of sensor-detected rotational speeds of the rear wheels () of the motor vehicle. It is also possible to determine plausibility, using the arithmetic mean of the sensor-detected rotational speeds of the front wheels (), in case of a failure of at least one of both generated signals () of the rotational speed sensors () of the rear wheels () for checking the plausibility of the output rotational speed of the gearbox ().

Growing community of inventors

Oberteuringen, Germany

Wilhelm Moser