Method of determining a reference position of a transmission actuator and transmission actuator
A technology of reference position and transmission, applied in the direction of elements with teeth, transmission control, belt/chain/gear, etc., can solve the problem that the absolute value sensor is not accurate enough and cannot be reached accurately enough.
Active Publication Date: 2018-09-21
SCHAEFFLER TECH AG & CO KG
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Problems solved by technology
However, the accuracy of the absolute value sensor is not high enough to reach the reference position of the shift finger accurately enough to reach the reference position of the transmission actuator
Method used
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Embodiment Construction
[0020] figure 1 A transmission actuator 1 according to the invention is shown schematically, which is a component of a motor vehicle transmission. The transmission actuator 1 has an electric motor 3 provided with a motor shaft 2 , wherein the electric motor 3 or its motor shaft 2 can each be driven in opposite directions of rotation. Furthermore, the transmission actuator 1 has a rotationally movable threaded spindle 5 about its central longitudinal axis 4 , which is rotatably driven by means of the electric motor 3 . The threaded spindle 5 is fixedly mounted in the axial direction. In order to transmit the torque from the motor shaft 2 to the threaded spindle 5 , a first gear wheel 6 is arranged in a rotationally fixed manner on or at the motor shaft 2 . The first gear wheel 6 meshes with a second gear wheel 7 arranged in a rotationally fixed manner on or on the threaded spindle 5 .
[0021] The transmission actuator 1 also has a spindle nut 8 drivable by means of a spindl...
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The invention relates to a method for determining a reference position of a transmission actuator, preferably for a motor vehicle transmission, in which said transmission actuator comprises an electric motor and engages, by means of a shift finger, with one of a plurality of shift gates of a shift rail, said electric motor carrying out a shift gate selection procedure in a first rotational direction, and implementing the shift procedure in said selected shift gate in a second rotational direction. In a method which allows a reference position of the transmission actuator to be ascertained reliably, said reference position is determined by a referencing procedure in which said reference position corresponds to a defined shift gate with which the shift finger engages by means of a mechanical reference aid of the shift rail. Once the shift finger has entered into engagement with the defined shift gate, the position of an absolute value sensor corresponding to the position of said shift finger is acquired as a reference position for said transmission actuator.
Description
technical field [0001] The invention relates to a method for determining a reference position of a transmission actuator and a transmission actuator for a motor vehicle transmission. Background technique [0002] In a vehicle transmission, gears are arranged on the first transmission shaft and on the second transmission shaft, said gears forming a gear pair, wherein one gear of the gear pair is connected in a rotationally fixed manner to the shaft carrying it and wherein the center of the gear pair Another gear is arranged torsionally with the shaft carrying it. In this case, however, the rotatably arranged gear wheel can be connected in a form-locking manner to the shaft carrying it by means of a coupling mechanism, ie by means of a shifting sleeve. [0003] The shifting of the transmission takes place here by means of a transmission actuator which has an actuator at least for selecting a gear stage and for engaging or disengaging a gear stage. In order to determine the r...
Claims
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IPC IPC(8): F16H61/32
CPCF16H61/32F16H2061/2838F16H2061/2884F16H2342/02
Inventor 马库斯·迪特里希托马斯·瓦克尔
Owner SCHAEFFLER TECH AG & CO KG