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Initialization method of operating unit of switching device and switching device for power shift transmission

A technology of switching device and control unit, applied in the direction of elements with teeth, transmission control, belt/chain/gear, etc., can solve the problem of unknown current absolute position of the transmission, etc.

Active Publication Date: 2016-05-18
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this results in the following problem: when the system is switched on, the current absolute position of the at least one actuating unit of the transmission is not known

Method used

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  • Initialization method of operating unit of switching device and switching device for power shift transmission
  • Initialization method of operating unit of switching device and switching device for power shift transmission
  • Initialization method of operating unit of switching device and switching device for power shift transmission

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Embodiment Construction

[0029] The invention will be described below with reference to an exemplary shift transmission. The transmission is only considered as a basic part of a power shift transmission, and the power shift transmission can be combined by a plurality of such shift transmissions. The term "shift transmission" refers to a transmission in which an input rotational speed can be converted into an output rotational speed via gears meshing with each other. At the same time, the ratio between the input speed and the output speed can be changed in steps. Among the transmissions referred to here are equiaxial and unequal shaft gear box transmissions, sliding gear transmissions, dog clutch transmissions, in particular dual clutch transmissions, etc. For the sake of brevity, the exemplary embodiments described below are only for a ring type transmission, which of course should not be understood as limiting the application of the solution proposed by the present invention to other transmissions. ...

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Abstract

The invention relates to a method for initializing the actuation unit (9) of a shift device (8), which can be moved in both movement directions along a shift shaft (6), for the alternate connection of two gearwheels (5a, 5b) into a transmission power flow, in which method a sensor (11) of the actuation unit (9) is used for detecting the position of the shift device (8), for which purpose the shift device (8) is moved successively in both movement directions as far as the blocked end position at the respective gearwheel (5a, 5b), wherein from this the movement travel (x) between the two blocked positions is determined, said movement travel subsequently being compared with the stored four possible movement travels (xNB, XGB, Xli, Xre), from which the actual position of the shift device (8) is established in order to initialize the actuation unit (9) in the case of different shift-through travels (S4 to S2, S1 to S3) in the two movement directions.

Description

technical field [0001] The invention relates to a shifting device for a power shift transmission, which is equipped with an actuating unit for switching two gears alternately into the power flow of the transmission, for initialization along the shift axis The shifting shifting device moves successively in both directions of movement up to the end-side blocking position on the associated gear wheel, and a sensor of the actuating unit is provided to detect the position of the shifting device. The invention also relates to a power shift transmission itself, in particular to a method for initializing the actuating unit of the aforementioned shifting device. [0002] The field of application of the invention relates in particular to dual clutch transmissions. Such a transmission consists in principle of at least two individual transmissions arranged in parallel, each having at least one power shifting element and several positively connected shifting elements. In this case, each ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H59/68F16H61/28F16H61/32F16H63/30
CPCF16H61/2807F16H59/68F16H61/32F16H63/304F16H2059/6807F16H2061/047F16H2061/283F16H2342/02
Inventor R·德赖霍尔茨M·赖施
Owner ZF FRIEDRICHSHAFEN AG
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