Zf Friedrichshafen Ag

Stefan Veittinger

Mario Steinborn

Rainer Petzold

Rupert Kramer

Wolfgang Gröner

A method for determining the output speed (N_AB) of a manual transmission of a motor vehicle. The output speed (N_AB) is calculated during a period of a shifting operation in which the current gear is disengaged and the new gear has yet to be engaged. The calculated output speed (N_AB) is used for controlling adjustment of the speed of the transmission input shaft (N_EG) to the speed of the transmission output shaft, or the calculated output speed (N_AB), is used for checking the plausibility of a value of the output speed (N_AB) as determined by the sensors.

Method for determining the output rotational speed of a manual transmission

A method for controlling operational sequencing of gears in an automatic transmission () which has been built in an auxiliary mode. In the case of such a shifting transmission it is possible that during the engagement of its transmission gear stage, impact noises or contact noises are present in the shifting procedure. This can occur by the generation of a tooth-on-tooth positioning between the toothing of a sliding collar () and the come-along toothing of an idler gear (). Provision is made for the control of the activation movement of the sliding collar () carried out in such a manner that an activation condition impact of the transmission parts, which are partakers in the shifting associated transmission part onto other transmission parts with the least possible impact force and/or with a least possible impact noise level.

Method for the control of operational sequencing in an automatic transmission of auxiliary construction

A control procedure for an automatic transmission, wherein, via a gear range shifter, a change of the gear range both between the forward travel gear range and the reverse travel gear range and between a fast gear mode and a creeper gear mode can be put into action. A control apparatus selects a transmission gear to be engaged, dependent on data, input by an operator with the aid of a gear range shifter for the manual choice of a driving gear area, whereby the gear range shifter possesses at least a D-shifting position for the selection of a forward travel gear range, an N-position for the selection of an idle running position of the automatic transmission and an R-position for the selection of a reverse travel gear range, and that the automatic transmission can be driven in a fast gear mode as well as in a creeper gear mode.

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Langenargen, Germany

Stefan Veittinger