Method for calibrating travel sensor assembly of motor vehicle drive train

Abstract

The invention relates to a method for calibrating a stroke sensor arrangement (44) of a motor vehicle drive train (10), the drive train (10) having a drive motor (14) and a transmission (18) via which the drive motor (14) can drive the motor vehicle. The transmission (18) comprises a first transmission element (12), a second transmission element (28b), a dog clutch (SE3), an actuating device (40) and a rotational speed sensor assembly (50). At least one of the transmission elements (12, 28b) is rotatably mounted in such a way that the transmission elements (12, 28b) can be rotated relative to each other. The dog clutch (SE3) is designed to connect the first transmission element (12) to the second transmission element (28b) in a rotationally fixed manner. The dog clutch (SE3) comprises a first clutch half (36), which is connected in a rotationally fixed manner to the first transmission element (12), and a second clutch half (38), which is connected in a rotationally fixed manner to the second transmission element (28b). The actuating device (40) is designed to displace the first clutch half (36) along an axis of rotation of the transmission (18).

Description

Technical Field

[0001] The present invention relates to a method for calibrating a travel sensor assembly for a motor vehicle drivetrain, as described in the preamble of claim 1. Background Technology

[0002] A known method for controlling an automated friction clutch arranged between an internal combustion engine and a multi-speed transmission in a motor vehicle transmission system is disclosed in DE 10 2008 044 823 A1. This friction clutch has a clutch travel that needs to be traversed between open and closed states. The clutch travel is detected based on a travel increment measured by a sensor during the clutch travel, and the sensor is calibrated at a designated position when the friction clutch is fully disengaged. Furthermore, it is configured such that if calibration fails, the closing process of the friction clutch is slowed compared to when calibration is completed normally.

[0003] DE 10 2013 226 516 A1 describes a measuring assembly that can determine the rotational direction, rotational speed, rotational position, and axial position of the rotating component of a claw clutch. Summary of the Invention

[0004] The object of the present invention is to provide a method for calibrating a stroke sensor assembly for a motor vehicle drivetrain, so as to enable particularly advantageous calibration of the stroke sensor assembly.

[0005] This objective is achieved by a method having the features described in claim 1. Advantageous designs with suitable improvements to the invention are given in the remaining claims.

[0006] This invention relates to a method for calibrating a stroke sensor assembly in the powertrain of a motor vehicle (also referred to simply as a vehicle, preferably designed as an automobile, particularly a passenger car). The calibration of the stroke sensor assembly is also known as fine-tuning or correction of the stroke sensor assembly. In particular, the calibration according to the invention, i.e., the method according to the invention, is a fine calibration of the stroke sensor assembly.

[0007] In this method, the transmission system has a drive motor and a transmission device, through which the motor vehicle can be driven by the drive motor. The drive motor can be an internal combustion engine, i.e., an internal combustion engine, or it can be an electric motor, by which the motor vehicle can be electrically driven via the transmission device, particularly in a purely electric manner. The transmission device has a first transmission element, a second transmission element, a claw clutch, an actuation device, and a speed sensor assembly. For example, the transmission system, particularly the transmission device, has a housing, in which it is feasible that the first transmission element and / or the second transmission element are arranged. Furthermore, it is conceivable that the housing is, for example, one of the transmission elements, in which, for example, another transmission element can be arranged.

[0008] Furthermore, it is feasible to arrange a claw clutch and / or actuation device and / or speed sensor assembly and / or stroke sensor assembly within the housing. At least one transmission element is rotatably supported, thereby allowing the transmission elements to rotate relative to each other, particularly about their rotational axes. Thus, for example, the at least one transmission element can rotate relative to the housing about its rotational axis, and is thus supported in a manner rotatable relative to the housing about its rotational axis. It is conceivable that two transmission elements are rotatably supported, such as a first transmission element and a second transmission element, which can rotate relative to the housing about their rotational axes and are therefore supported relative to the housing. Alternatively, it is conceivable that the at least one transmission element is rotatably supported and thus can rotate relative to the housing and relative to another transmission element about its rotational axis, wherein the other transmission element is torsionally connected to the housing. The claw clutch is designed to torsionally connect the first transmission element to the second transmission element. In other words, the transmission elements can be torsionally connected to each other by means of the claw clutch. A claw clutch has a first clutch half that is anti-torsionally connected to a first transmission element and a second clutch half that is anti-torsionally connected to a second transmission element. For example, the clutch halves can be anti-torsionally connected to each other, wherein the transmission elements can be anti-torsionally connected to each other by means of the anti-torsional connection of the clutch halves. Specifically, the claw clutch can switch between a disengaged state, also known as the disengaged position, and a closed state, also known as the closed position. In the closed state, the clutch halves are anti-torsionally connected to each other, thereby anti-torsionally connecting the transmission elements to each other by means of the claw clutch. Therefore, the transmission elements cannot rotate relative to each other about the transmission element rotation axis in the closed state. In the disengaged state, the clutch halves can rotate relative to each other, particularly about the transmission element rotation axis, thereby allowing the transmission elements to rotate relative to each other, particularly about the transmission element rotation axis, in the disengaged state. In other words, in the disengaged state, the claw clutch allows relative rotation between the transmission elements, particularly about the transmission element rotation axis. The claw clutch is a form-locking clutch, thus allowing the transmission elements to be anti-torsionally connected to each other in a form-locking manner by means of the claw clutch. In other words, when the claw clutch is closed, the transmission components are connected to each other in a form-locking manner to resist torsion.

[0009] The actuation device is designed to displace the first clutch half along the rotational axis of the transmission, particularly relative to the housing. Specifically, the rotational axis of the transmission can be the rotational axis of the transmission element. In particular, the actuation device is designed to displace the first clutch half relative to the second clutch half along the rotational axis of the transmission.

[0010] The stroke sensor assembly has an information transmitter fixedly connected to the first clutch half. This fixed connection of the information transmitter to the first clutch half should be understood in particular as such a connection prevents relative movement between the information transmitter and the first clutch half. Therefore, the information transmitter can move along with the first clutch half. The stroke sensor assembly also has a stroke sensor element, which can be at least indirectly fixedly connected to the housing, for example. Thus, this sensor element (also simply referred to as the sensor element) is at least indirectly connected to the housing in a way that prevents relative movement between the stroke sensor element and the housing. For example, the first clutch half and its accompanying information transmitter can move relative to the stroke sensor element along a rotation axis, particularly relative to the housing, especially by displacement, particularly by means of an actuation device.

[0011] The speed sensor assembly is designed to detect the angular position of the at least one transmission element, particularly its angular position relative to the other transmission element. In particular, "angular position" should be understood as the torsion of the at least one transmission element relative to the other transmission element, especially the torsion about the axis of rotation of the transmission element.

[0012] Now, in order to advantageously calibrate the stroke sensor assembly, according to the invention, the first sub-step of the method is performed in a transmission state of the transmission device (in which, for example, the first and second transmission elements are at least substantially stationary). In this first sub-step, the first clutch half is moved along the axis of rotation toward the second clutch half by means of an actuation device, and, for example, relative to the housing, until the claw clutch is in a closed state. In other words, in the first sub-step, the first clutch half is continuously moved along the axis of rotation toward the second clutch half by means of an actuation device, and particularly relative to the housing, until the claw clutch is adjusted to or has been adjusted to a closed state, i.e., the claw clutch is engaged or has been engaged, i.e., until the claw clutch reaches its closed state. In a second sub-step of the method, particularly following the first sub-step, performed in the aforementioned transmission state, a first stroke sensor signal is assigned to the closed state, particularly by means of an electronic computing device, wherein the stroke sensor signal is provided by the stroke sensor assembly in the closed state and characterizes the information transmitter detected by the stroke sensor element in the closed state, and thus the first position of the first clutch half. The first sub-step and the second sub-step are, for example, sub-steps that are components of the first method step of the method, which includes the first sub-step and the second sub-step.

[0013] The third sub-step of the method is performed in the aforementioned state, where the third sub-step of the transmission device follows, for example, the first and second sub-steps. In the third sub-step, the claw clutch disengages, thereby transitioning to the disengaged state of the claw clutch, and then the fourth sub-step of the method, which follows the third sub-step in time, is performed. The third and fourth sub-steps are performed in the aforementioned transmission device state. In the fourth sub-step of this method, which follows the third sub-step in time, the transmission elements are rotated relative to each other by a torsion angle, specifically about the axis of rotation of the transmission elements, by means of a drive motor and a speed sensor assembly. This torsion angle is detected, for example, by means of a speed sensor assembly. Therefore, this torsion angle is, for example, the value (angular position) of the aforementioned torsion of the at least one transmission element. Therefore, for example, in the fourth sub-step, it is set up such that the transmission elements are rotated relative to each other by means of a drive motor, specifically about the axis of rotation of the transmission elements, so that the transmission elements, especially the axis of rotation of the transmission elements, are rotated relative to each other by this torsion angle. In other words, for example, in the fourth sub-step, the transmission elements are configured to continuously rotate relative to each other by means of a drive motor, particularly about the rotation axis of the transmission elements. That is, in the fourth sub-step, the drive motor continuously induces relative rotation between the transmission elements, particularly about the rotation axis of the transmission elements, until a rotational speed sensor assembly detects, for example, an angular position value (torsion) corresponding to a specified or pre-specified torsion angle. Therefore, the torsion angle is, for example, a specified or pre-specified value of the angular position, particularly a target value. This, for example, means that the torsion angle is the specified or preferably pre-specified target value of the aforementioned torsion, wherein the rotation angle can be stored in the electrical or electronic data memory of the electronic computing device used to perform the method. Preferably, the third and fourth sub-steps are sub-steps, i.e., components of the second method step of the method, which is performed in the transmission state, i.e., while the transmission is in the transmission state.

[0014] In the fifth sub-step of the method, performed in the aforementioned transmission configuration, the first clutch half is moved along the axis of rotation and, for example, specifically relative to the housing, toward the second clutch half by means of an actuation device until the claw clutch (also simply referred to as the clutch) reaches the first tooth-to-tooth state, also known as the first tooth-to-tooth position. Specifically, the fifth sub-step is performed, for example, after the third sub-step and, for example, after the fourth sub-step.

[0015] In the sixth sub-step of this method, which follows the fifth sub-step, the sixth sub-step is performed in the aforementioned transmission device state. Specifically, it involves using an electronic computing device to distribute a second stroke sensor signal to the first gear-to-gear state. This second stroke sensor signal is provided by the stroke sensor assembly in the first gear-to-gear state and characterizes the information transmitter detected by the stroke sensor element in the first gear-to-gear state, and thus the second position of the first clutch half. For example, the fifth and sixth sub-steps are sub-steps, that is, components of the third method step of this method, which is performed in the aforementioned transmission device state.

[0016] In the seventh sub-step of this method, which particularly follows the sixth sub-step, the stroke sensor assembly is calibrated, specifically by means of an electronic computing device, based on the first stroke sensor signal, particularly based on the correspondence between the first stroke sensor signal and the closed state, and based on the second stroke sensor signal, particularly based on the correspondence between the second stroke sensor signal and the first tooth-to-tooth state. The seventh sub-step is the fourth method step, which particularly follows the third method step and also the first and second method steps, and is performed in the aforementioned transmission device state. Specifically, the fourth method step is a calibration step, in which the stroke sensor assembly is calibrated based on the first stroke sensor signal and the second stroke sensor signal.

[0017] The first and third method steps do not necessarily have to be performed in the order they are mentioned. In other words, it is possible that the third method step follows the first method step in time, and preferably also follows the second method step in time; that is, for example, the third method step is performed after the first method step in time, and preferably also after the second method step in time. Here, the second method step is preferably performed after the first method step in time and before the third method step in time.

[0018] Alternatively, it is conceivable that the first and third method steps are interchanged, i.e., the first method step is executed after the third method step in time, and preferably also after the second method step in time. In other words, in a first variant of the method, the second method step can be configured to be executed between the first and third method steps, such that the second method step is executed after the first method step and before the third method step, and vice versa. Furthermore, it is conceivable that in a second variant of the method, the second method step is executed between the third method step and the first method step, such that the second method step is executed after the third method step and before the first method step, wherein the first method step is executed after the third method step in time and after the second method step in time. For example, if the second method step is executed after the first method step in time and before the third method step in time, such that the third method step is executed after the first method step in time and after the second method step in time, then the claw clutch disengages in the second method step, thereby changing from the closed state in the first method step to the disengaged state. However, for example, if the second method step is executed after the third method step and before the first method step in time, so that the first method step is executed after the third method step and after the second method step in time, then, for example, the claw clutch disengages in the second method step and thus changes from the first tooth-to-tooth state in the third method step to the disengaged state.

[0019] The tooth-to-tooth state of a claw clutch should be understood in particular as follows: at least one or exactly one tooth of one clutch half, particularly in the axial direction of the claw clutch and therefore when viewed along the axis of rotation, is located on at least one or exactly one tooth of the other clutch half, that is, particularly in the axial direction of the claw clutch and therefore when viewed along the axis of rotation, abuts against at least one or exactly one tooth of the other claw clutch, particularly directly.

[0020] The characteristic that the transmission elements are at least substantially stationary in the aforementioned transmission configuration should be understood as follows: the two transmission elements do not rotate relative to each other and / or relative to the housing, or at least one or exactly one transmission element or both transmission elements rotate at extremely low speeds, particularly about the transmission elements relative to each other and / or relative to the housing. Furthermore, it is preferably configured such that, in the aforementioned transmission configuration, no torque suitable for or designed to drive a motor vehicle acts on the transmission elements.

[0021] For example, to execute the first sub-step and to execute the fifth sub-step, the closing process of the claw clutch (also simply called the clutch) is performed. If the closing process results in the closed state of the claw clutch, then the closing process is executed as the first sub-step, or the closing process is the first sub-step. However, if the closing process results in the first tooth-to-tooth state, then the closing process is executed as the fifth sub-step, or the closing process is the fifth sub-step. Therefore, whether the closing process results in the closed state of the claw clutch or the first tooth-to-tooth state depends on how the transmission elements are oriented relative to each other when viewed about the axis of rotation of the transmission elements during the execution of the closing process. Therefore, after the execution of the closing process, it may not be possible to determine whether the closing process results in the closed state or the first tooth-to-tooth state. This can be addressed by setting the method such that, for example, after the first method step and after the third method step, and preferably also after the second method step and after the fourth method step, the eighth sub-step of the method is executed in the aforementioned transmission device state. In the eighth sub-step, for example, the first stroke traversed by the information transmitter, particularly by the first clutch half, is determined specifically based on the first stroke sensor signal, and in the eighth sub-step, the second stroke traversed specifically by the information transmitter and therefore by the first clutch half, is determined specifically based on the second stroke sensor signal, for example. Thus, the first stroke belongs to the first stroke sensor signal, and vice versa, and the second stroke belongs to the second stroke sensor signal, and vice versa. In the eighth sub-step, for example, the stroke sensor signal belonging to the longer stroke is assigned to the closed state, and for example, the stroke sensor signal belonging to the shorter stroke is assigned to the first tooth-to-tooth state. The background to this is particularly that when the closing process causes the claw clutch to be in the closed state, the information transmitter and therefore the first clutch half will traverse a longer stroke, especially when viewed along the axis of rotation, compared to when the closing process causes the claw clutch to be in the first tooth-to-tooth state.

[0022] Within the scope of this disclosure, the term or feature “torsional” should be understood as follows: two elements, particularly those supported in a rotatable manner, such as transmission elements, are torsionally connected when and particularly precisely when they are arranged coaxially with each other and connected in such a way that they (particularly when driven) rotate about the axis of rotation of the transmission element at the same angular velocity (particularly relative to the housing). Within the scope of this disclosure, an element supported in a rotatable manner, such as the at least one transmission element, is torsionally connected to the housing when and preferably precisely when the element cannot be torsional relative to the housing. Two elements torsionally connected can be axially displaced relative to each other, that is, displaced along the axial direction of the transmission system. The axial direction of the transmission system, for example, coincides with or extends along the axis of rotation. The terms “axial” and “axial direction” refer to the axis of rotation of the transmission device.

[0023] In an advantageous design of the invention, the transmission system has a housing, wherein preferably, the first clutch half is torsionally connected to the housing, particularly permanently connected. For example, the first transmission element is torsionally connected to the housing, particularly permanently connected.

[0024] Here, it has proven particularly advantageous that the second clutch half is rotatable relative to the housing, particularly about the rotation axis of the transmission element. Preferably, the second transmission element is rotatable relative to the housing, particularly about the rotation axis of the transmission element.

[0025] To enable particularly advantageous calibration of the stroke sensor assembly, in another embodiment of the invention, the torsion angle is configured such that it corresponds to the maximum tooth width of the claw clutch teeth. Specifically, the tooth width extends in the circumferential direction of the claw clutch about its axis of rotation.

[0026] In another particularly advantageous embodiment of the invention, the clutch halves are each configured to have engaging teeth and locking teeth. In the ninth sub-step, which follows the sixth sub-step in particular in time, the method is preferably executed in the aforementioned transmission configuration. The first clutch half is moved along the axis of rotation toward the second clutch half by means of an actuation device until the claw clutch reaches a second tooth-to-tooth state. The preceding and following descriptions of the first tooth-to-tooth state can also be readily applied to the second tooth-to-tooth state, and vice versa. For example, another sub-step is executed between the ninth and sixth sub-steps in time, in which the claw clutch disengages, thereby transitioning the claw clutch to a disengaged state. This other sub-step may include, particularly in this other step, after disengaging the claw clutch by means of a drive motor and a speed sensor assembly, causing a second relative rotation between the transmission elements according to the aforementioned torsion angle or another torsion angle, which is detected, for example, by means of the speed sensor assembly. In the second tooth-to-tooth state of the claw clutch, triggered by the ninth sub-step, one engaging tooth of one clutch half is located on one locking tooth of the other clutch half. In the ninth sub-step, a third stroke sensor signal is assigned to the second tooth-to-tooth state, provided by the stroke sensor assembly, and characterizes the third position of the information transmitter detected by the stroke sensor element in the second tooth-to-tooth state. In the seventh sub-step, particularly immediately following the ninth sub-step, the stroke sensor assembly is then calibrated, for example, based on the first stroke sensor signal, the second stroke sensor signal, and the third stroke sensor signal, particularly based on the corresponding assignment relationship between the respective stroke sensor signals and the respective states. This calibration of the stroke sensor assembly is particularly advantageous.

[0027] In order to enable favorable calibration of the stroke sensor assembly, in another embodiment of the invention, the clutch is configured such that, in the first tooth-to-tooth state of the claw clutch, one of the engaging teeth of one clutch half is located on one of the engaging teeth of the other clutch half, i.e., along the axis of rotation, particularly directly abutting against one of the engaging teeth of the other clutch half.

[0028] To achieve favorable calibration, another embodiment is characterized in that, when viewed along the axis of rotation, the corresponding engaging tooth of the corresponding clutch half is longer than the corresponding locking tooth of the corresponding clutch half.

[0029] In another particularly advantageous embodiment of the invention, the transmission elements are configured to be stationary in the aforementioned transmission configuration state, i.e., the transmission elements do not rotate relative to each other and / or relative to the housing. It is conceivable that in the aforementioned transmission configuration state, at least one or exactly one transmission element, particularly both transmission elements, rotates at a certain rotational speed, particularly relative to the housing and / or relative to each other and about the axis of rotation of the transmission elements, wherein this rotational speed is less than a specified threshold.

[0030] To achieve a particularly advantageous calibration, in another embodiment of the invention, the transmission mechanism is configured such that, in the aforementioned transmission configuration, no relative rotation occurs between the transmission elements, or in the aforementioned transmission configuration, the transmission elements rotate relative to each other at a speed less than a specified limit, particularly about the axis of rotation of the transmission elements. For example, the limit is a threshold value, or a value different from the threshold value.

[0031] Finally, in order to achieve particularly advantageous calibration of the stroke sensor assembly, it has proven particularly advantageous to drive the transmission elements without the aid of a drive motor in the aforementioned transmission configuration. Attached Figure Description

[0032] Further advantages, features, and details of the invention are set forth in the following description of preferred embodiments and with reference to the accompanying drawings. Without departing from the scope of the invention, all features and combinations thereof mentioned in the specification, and all features and combinations thereof mentioned in and / or shown in the accompanying drawings, may be used not only in their respective combinations, but also in other combinations or individually.

[0033] In the attached diagram:

[0034] Figure 1 This is a partial schematic diagram of the transmission system of a motor vehicle; Figure 2 This is a schematic diagram of the claw clutch in the disengaged state of the transmission system. Figure 3 This is a schematic diagram of a claw clutch when the first tooth is engaged. Figure 4 This is a schematic diagram of a claw clutch in the closed state. Figure 5 This is a schematic diagram of a claw clutch in the second tooth-to-tooth position. Detailed Implementation

[0035] In the figure, the same or functionally identical elements have the same reference numerals.

[0036] Figure 1A partial schematic diagram of a drivetrain 10 of a motor vehicle (also simply referred to as a vehicle, and preferably designed as an automobile, particularly a passenger car) is shown. The drivetrain 10 has... Figure 1 The housing 12 is shown schematically in the diagram. The transmission system 10, for example, has a housing 12. Figure 1 The drive motor 14, specifically shown in the diagram, drives the motor vehicle. The drive motor 14 provides at least one driving torque, indicated by arrow 16, for driving the motor vehicle. Here, the transmission system 10 has a transmission device 18 via which the motor vehicle can be driven by the drive motor 14. Figure 1 In the illustrated embodiment, the transmission device 18 has a first planetary gear set 20 and a second planetary gear set 22, wherein the respective planetary gear sets 20, 22 can be at least partially arranged within the housing 12. The respective planetary gear sets 20, 22 have respective sun gears 24a, 24b, respective ring gears 26a, 26b, and respective planet carriers 28a, 28b. Furthermore, the respective planetary gear sets 20, 22 have planetary gears. In the planetary gears of the planetary gear set 20, in... Figure 1 The image shows a planetary gear marked 30a, which is part of the planetary gear set 22. Figure 1 The image shows a planetary gear labeled 30b. It can be seen that planetary gear 30a is rotatably held on the planet carrier 28a of planetary gear set 20, and planetary gear 30b of planetary gear set 22 is rotatably held on the planet carrier 28b of planetary gear set 22. Furthermore, the transmission 18 includes a differential gear assembly 32, as indicated by arrow 34, by which wheels on the same axle of the motor vehicle can be driven. Specifically, arrow 34 indicates that the drive torque input to or input to the differential gear assembly 32, or the torque generated by the drive torque, can be distributed or allocated to the wheels by the differential gear assembly. In this invention, the differential gear assembly 32 is designed as a bevel gear differential, also simply referred to as a conical differential. It can be seen that the planet carrier 28a is connected to or can be connected to the input element of the differential gear assembly 32 in a torque-transmitting manner, particularly in a torsional manner, wherein it is conceivable that the planet carrier 28a is torsionally connected to the input element of the differential gear assembly 32, particularly in a permanent connection. The sun gear 24a can be driven by the drive motor 14, and in particular, it can be driven in such a way that the sun gear 24a is connected to, or can be connected to, the driven shaft, also known as the output shaft, of the drive motor 14 in a torque-transmitting manner, particularly in a torsion-resistant manner. In this invention, the ring gear 26a is torsion-resistantly connected to the sun gear 24b, particularly in a permanent connection. Furthermore, the ring gear 26b is configured to be torsion-resistantly connected to, particularly in a permanent connection, to the input element of the differential gear device 32.

[0037] The transmission system 10 has a first shifting element SE1, by which the ring gear 26a and therefore the sun gear 24b are torsionally connected to the housing 12. A second shifting element SE2 is also provided, by which the input element of the differential gear assembly 32, and therefore the ring gear 26b and, in this invention, the planet carrier 28a, are torsionally connected to the housing 12. Furthermore, the transmission system 10 has a third shifting element SE3, by which at least one or exactly one planet carrier of the transmission 20 is torsionally connected to the housing 12. In this invention, the planet carrier 28b of the planetary gear set 22 is torsionally connected to the housing 12 by means of the shifting element SE3. The shifting element SE3 is a claw clutch, and therefore a form-locking shifting element. This claw clutch has a first clutch half 36, which is displaceable relative to the housing 12 along the rotational axis of the transmission 20. Furthermore, the claw clutch has a second claw clutch half 38, which is torsionally connected to the planetary carrier 28b, particularly permanently. In the embodiment shown in the figure, the housing 12 is the first transmission element of the transmission 20, and the planetary carrier 28b is the second transmission element of the transmission 20. The first clutch half 36 is torsionally connected to the housing 12, particularly permanently, however, it can be displaced relative to the housing 12 along the axis of rotation and thus in the axial direction of the transmission 20. The second transmission element can rotate about the axis of rotation relative to the housing 12 and relative to the first transmission element, wherein this axis of rotation is also referred to as the transmission element rotation axis. Alternatively, it is conceivable that the first transmission element is an additional transmission element provided in addition to the housing 12 and the second transmission element, thereby allowing, for example, the first transmission element to rotate about the axis of rotation relative to the housing 12. In the embodiment shown in the figure, the second transmission element, namely the planetary carrier 28b, is rotatably supported, and thus can rotate about its axis of rotation relative to the housing 12, thereby allowing the transmission elements to rotate relative to each other. In this invention, the second transmission element is thus allowed to rotate about its axis of rotation relative to the housing 12. A claw clutch (third shifting element SE3) allows the transmission elements, namely the planetary carrier 28b and the housing 12, to be torsionally connected. For this purpose, the claw clutch can switch between a disengaged state and a engaged state. In the engaged state, the transmission elements are torsionally connected to each other by means of the claw clutch in a form-locking manner, thereby preventing relative rotation between the transmission elements about their axis of rotation. In the disengaged state, the claw clutch allows relative rotation between the transmission elements about their axis of rotation, so that in the disengaged state, the transmission elements can rotate relative to each other about their axis of rotation. Here, the second clutch half 38 is torsionally connected to the second transmission element (planetary carrier 28b), particularly permanently connected. The first clutch half 36 is torsionally connected to the first transmission element (housing 12), particularly permanently connected.

[0038] The transmission 18 has an actuating device 40 designed to displace the first clutch half 36 along the axis of rotation of the transmission 20, particularly relative to the housing 12. For this purpose, the actuating device 40 has an actuating piston 42, also simply referred to as a piston, which is actuable, particularly hydraulically actuated, wherein actuation of the actuating piston 42 displaces the first clutch half 36 along the axis of rotation, particularly relative to the housing 12. Through this displacement of the first clutch half 36, particularly relative to the housing 12 and along the axis of rotation, the claw clutch can be switched between a disengaged and engaged state. Specifically, by means of the actuating device 40, particularly by means of the actuating piston 42, the displacement of the first clutch half 36 along the axis of rotation and relative to the housing 12, the claw clutch can be switched, particularly, from a disengaged state to a engaged state.

[0039] The transmission system 10, particularly the transmission device 18, also includes a stroke sensor assembly 44 by means of which the position of the clutch half 36 can be detected. Here, the stroke sensor assembly 44 has an information transmitter 46 fixedly connected to the first clutch half 36 and a stroke sensor element 48, also simply referred to as a sensor element, which is, for example, immovable relative to the housing 12. The information transmitter 46 and the clutch half 36 can move together relative to the stroke sensor element 48, and particularly relative to the housing 12, specifically they can be displaced together. The position of the corresponding element of the information transmitter 46 can be detected by means of the stroke sensor element 48. Since the information transmitter 46 is fixedly connected to the clutch half 36, relative movement between the clutch half 36 and the information transmitter 46 is prevented, therefore, the position of one of the corresponding elements of the information transmitter 46 corresponds to one, particularly exactly one, corresponding position of the clutch half 36, thereby the position of the clutch half 36 can be detected by detecting the element position. Therefore, the position of the clutch half 36 can be detected by means of the stroke sensor element 48.

[0040] Furthermore, the transmission device 18 and therefore the transmission system 10 includes a speed sensor assembly 50, which is designed to detect the angular position of the second transmission element, i.e., the planetary carrier 28b, which is also referred to as or designed to be torsional and, in particular, relative to the housing. It should be understood in particular that the speed sensor assembly 50 can detect at least one or more values ​​of the angular position of the second transmission element, particularly relative to the housing 12. Specifically, the speed sensor assembly 50 can detect the rotational speed of the second transmission element about its axis of rotation relative to the housing 12. The speed sensor assembly 50 has a transmitter element 52, which in this invention is designed, for example, as a speed sensing wheel. The transmitter element 52 is torsionally connected to the second transmission element, particularly permanently connected, so that the transmitter element 52 can rotate about its axis of rotation together with the second transmission element relative to the first transmission element. Furthermore, the speed sensor assembly 50 has a speed sensor 54, which is torsionally connected to the first transmission element. In particular, the speed sensor 54 is connected to the first transmission element in such a way that relative movement between the first rotating element and the speed sensor 54 is prevented. The angular position of the transmitter element 52 can be detected using the speed sensor 54. Since the transmitter element 52 is connected to the second transmission element in a torsional manner, the angular position of the transmitter element corresponds to the angular position of the second transmission element. Therefore, the angular position can be detected by detecting the angular position of the element using the speed sensor 54. This means that the angular position of the second transmission element can be detected using the speed sensor 54.

[0041] The following describes a method for calibrating the stroke sensor assembly 44. In this method, a first method step is performed in a transmission state of the transmission device 20, in which the transmission elements are substantially stationary. In this first method step, the first clutch half 36 is moved along the axis of rotation and, particularly relative to the housing 12, toward the second clutch half 38 by means of the actuating device 40 until the claw clutch is engaged, i.e., the movement continues until the claw clutch reaches the engaged state. Furthermore, in the first method step, a first stroke sensor signal is assigned to the engaged state, which is provided by the stroke sensor assembly 44 in the engaged state and characterizes the first position of the information transmitter 46 detected by the stroke sensor element 48 in the engaged state. A second method step is performed in the aforementioned transmission state. In the second method step, the claw clutch disengages, thus transitioning to the disengaged state, and subsequently, by means of a drive motor and a speed sensor assembly 50, the transmission elements are rotated relative to each other by a torsional angle. This is, for example, in… Figure 1In the illustrated embodiment, this is achieved such that the second transmission element is twisted relative to the housing 12 about the rotation axis by means of the drive motor 14 and the speed sensor assembly 50. Specifically, the feature of inducing relative rotation by means of the speed sensor assembly 50 in the second method step should be understood as follows: in the second method step, the drive motor 14 causes the transmission elements to continuously rotate relative to each other, particularly about the rotation axis, until the value (angular position) of the torsion detected by the speed sensor 50 during this relative rotation matches, for example, a specified or pre-specified torsion angle. Therefore, this torsion angle is, for example, a target value, wherein in the second method step, the drive motor 14 causes the transmission elements to continuously rotate relative to each other, particularly about the rotation axis, until the value of the torsion detected by the speed sensor 59 during this relative rotation matches the target value.

[0042] In this method, the third method step is performed under the aforementioned transmission device conditions. In this third method step, the first clutch half 36 is moved along the axis of rotation, and particularly relative to the housing 12, toward the second clutch half 38 by means of the actuating device 40, until the claw clutch reaches the first tooth-to-tooth state; that is, the movement continues until the claw clutch is in the first tooth-to-tooth state. It is conceivable that the second method step is performed after the first method step, and the third method step is performed after both the first and second method steps. Therefore, for example, the claw clutch is disengaged in the second method step, thereby changing from the closed state initiated in the first method step to the disengaged state. Alternatively, it is conceivable that the second method step is performed after the third method step, and the first method step is performed after both the third and second method steps, thereby changing the claw clutch from the first tooth-to-tooth state initiated in the third method step to the disengaged state, for example, in the second method step.

[0043] In the third method step, a second stroke sensor signal is assigned to the first tooth-to-tooth state, which is provided by the stroke sensor assembly 44, in particular by the stroke sensor element 48, and characterizes a second position in the position of the information transmitter 46 detected by means of the stroke sensor element 48 in the first tooth-to-tooth state.

[0044] The fourth method step of the method is performed in the aforementioned transmission device state, wherein the fourth method step immediately follows the first, second, and third method steps in time. In the fourth method step, the stroke sensor assembly 44 is calibrated based on the first stroke sensor signal and the second stroke sensor signal. Specifically, the fourth method step is configured to calibrate the stroke sensor assembly 44 based on the correspondence between the first stroke sensor signal and the closed state and based on the correspondence between the second stroke sensor signal and the first tooth-to-tooth state. Therefore, the fourth method step is a calibration step in which the stroke sensor assembly 44 is calibrated, either during or through this method step. The fourth method step includes, for example, creating or generating a new second sensor characteristic curve for the stroke sensor assembly 44 based on the first stroke sensor signal and the second stroke sensor signal, particularly based on the correspondence between the first stroke sensor signal and the closed state and the correspondence between the second stroke sensor signal and the first tooth-to-tooth state. This second sensor characteristic curve replaces, for example, the old first sensor characteristic curve. After the creation of the second sensor characteristic curve, i.e., after the creation of the second sensor characteristic curve and thus after performing the fourth method step, the position of the information transmitter 46 is detected by the stroke sensor assembly 44 based on the second sensor characteristic curve. It can be seen that the detected, i.e., measured first position and the detected, i.e., measured second position of the information transmitter 46 are stroke points. A new second sensor characteristic curve is created based on these stroke points, wherein the stroke sensor assembly 44 is calibrated by replacing the first sensor characteristic curve with the second sensor characteristic curve, thus replacing the first sensor characteristic curve.

[0045] This method is a self-learning procedure that can precisely define the tolerance-dependent functional position of an individual unit (in the form of a claw clutch in this invention). This method allows for the conversion of relative measurements into an absolute reference system, which can vary depending on the unit and, in particular, on the different tolerance ranges of the components. Traditional stroke sensors, especially in the automotive field, can only perform relative measurements. This means setting a reference point and then measuring the position relative to that reference point. Consequently, errors may exist between the measured values ​​and the actual mechanical positions, where the reasonableness of these measurement errors cannot be verified. In contrast, absolute measurement sensing systems are significantly more expensive and therefore generally unsuitable for automotive applications. Specifically, this method enables the reasonableness verification of the two tooth planes of a claw clutch using a relative measurement sensing system, particularly in the form of stroke sensor assembly 44.

[0046] from Figures 2 to 5It can be seen that clutch half 36 has a first toothed portion 56, which has a first tooth 58 and a second tooth 60. The second clutch half 38 has a second toothed portion 62, which has a third tooth 64 and a fourth tooth 66. Tooth 58 is the first engaging tooth of the first clutch half 36, and tooth 64 is the second engaging tooth of the second clutch half 38. Tooth 60 is the first locking tooth of the first clutch half 36, and tooth 66 is the second locking tooth of the second clutch half 38. It can be seen that the corresponding teeth 58 and 64 of the corresponding clutch halves 36 and 38 are longer in the axial direction of the claw clutch, and therefore, when viewed along the axis of rotation, than the corresponding teeth 60 and 66 of the corresponding clutch halves 36 and 38. The axial direction of the claw clutch... Figure 2 The double arrow 68 is shown in the middle. Figure 2 In the diagram, the first end stop is marked E1, wherein the actuating piston 42, in the disengaged state, can be located at or inside the corresponding end stop E1, thus demonstrating the positional variability of the actuating piston 42 in the disengaged state, particularly the positional variability caused by tolerances, through the end stop E1. Figure 2 In the diagram, the second end stop is marked E2, where the actuating piston 42, for example, can be located at or inside the corresponding end stop E2 in the closed state of the claw clutch. Thus, the end stop E2 indicates the positional variability of the actuating piston 42 in the closed state, particularly the positional variability caused by tolerances. These positional variability can be compensated for by the above method, so that even with positional variability, the position of the information transmitter 46 can be accurately detected by means of the stroke sensor assembly 44, and therefore the position of the first clutch half 36. The two tooth planes of the claw clutch are as follows... Figure 2As shown, and labeled ZE1 and ZE2 respectively. Here, tooth 58 terminates at tooth plane ZE1 in the axial direction of the claw clutch, and tooth 60 terminates at tooth plane ZE2 in the axial direction of the claw clutch. This method specifically utilizes the fact that teeth 56 and 62 are manufactured with a defined extremely high precision, thereby allowing for precise calibration of the stroke sensor assembly 44 based on teeth 56 and 62 to compensate for these positional variability. By assigning the stroke sensor signal to the aforementioned states, self-learning is performed on the first and second positions, thereby enabling precise calibration of the stroke sensor assembly 44. In particular, this allows for the measurement of the relative distance between the two tooth planes ZE1 and ZE2, especially extending in the axial direction of the claw clutch. Since teeth 56 and 62 are manufactured with high precision, the measured first and second positions can be assigned as measured sensor values, particularly as corresponding absolute values, and especially as precise values. Therefore, the toleranced end stops E1 and E2, and thus the entire stroke, can be assigned to the respective positions in an absolute value manner. This method offers the particular advantage of deriving absolute values ​​from a relative measurement sensing system (especially in the form of a stroke sensor assembly 44), allowing the stroke sensor assembly 44 to be designed as a low-cost relative measurement system. In contrast, more expensive absolute measurement systems can be avoided. The resulting high accuracy allows for the advantageous identification of variations throughout the system. This also provides the advantage of maintaining or designing smaller clearances. Furthermore, the probability of accidental contact when the claw clutch disengages can be extremely low.

[0047] Figure 2 This shows the disengaged state of the claw clutch.

[0048] Figure 3 This shows the first tooth-to-tooth state of the claw clutch. From Figure 3 As can be seen, in the first tooth-to-tooth state of the claw clutch, the engaging teeth of the first clutch half 36 are located on the engaging teeth of the second clutch half 36, that is, the engaging teeth of the first clutch half 36 abut against the engaging teeth of the second clutch half 38 in the axial direction of the claw clutch, especially directly abutting against them.

[0049] Figure 4 The closed state of the claw clutch is shown, in which teeth 56 and 62 mesh with each other such that teeth 58 and 60 of clutch half 36 are not located on teeth 64 and 66 of the second clutch half 38, and vice versa.

[0050] at last, Figure 5The second tooth-to-tooth state of the claw clutch is shown. In the second tooth-to-tooth state, the engaging teeth of the first clutch half 36 are located on the locking teeth of the second clutch half 38 in the axial direction of the claw clutch, and specifically, the locking teeth of the first clutch half 36 are located on the locking teeth of the second clutch half 38 in the axial direction of the claw clutch. For example, the fifth method step is configured to be performed in the above-described transmission state, wherein, for example, the fifth method step is performed before the fourth method step in time. In the fifth method step, by means of the actuating device 40, in particular the actuating piston 42, the first clutch half 36 is moved along the axis of rotation, in particular relative to the housing 12 toward the second clutch half 36, until the second tooth-to-tooth state of the claw clutch is reached, i.e., the movement continues until the claw clutch reaches the second tooth-to-tooth state. In the fifth method step, a third stroke sensor signal is assigned to the second tooth-to-tooth state. This third stroke sensor signal is provided by the stroke sensor assembly 44, particularly by the stroke sensor element 48, in the second tooth-to-tooth state, and characterizes a third position among the positions of the information transmitter 46 detected by the stroke sensor element 48 in the second tooth-to-tooth state. Subsequently, for example, in the fourth method step, it is thus set to calibrate the stroke sensor assembly based on the third stroke sensor signal, i.e., particularly based on the corresponding assignment of the third stroke sensor signal to the second tooth-to-tooth state.

[0051] List of reference numerals 10. Transmission System 12 shells 14 drive motors 16 arrows 18 Transmission devices 20 planetary gear sets 22 planetary gear sets 24a Sun Gear 24b Sun Gear 26a gear ring 26b gear ring 28a Planetary Carrier 28b planetary support 30a Planetary Gear 30b planetary gear 32 Differential Gear Unit 34 arrows 36 First clutch half 38 Second clutch half 40 Actuators 42 Actuating Piston 44 stroke sensor assembly 46 Information Transmitters 48 stroke sensor elements 50 RPM sensor assembly 52 Transmitter Components 54 speed sensor 56 First tooth 58 First tooth 60 second tooth 62 Second tooth 64 Third tooth 66 Fourth tooth 68 double arrows E1 First End Block E2 Second End Block SE1 First Shift Element SE2 Second Shift Element SE3 third shift element ZE1 tooth plane ZE2 tooth plane.

Claims

1. A method for calibrating a stroke sensor assembly (44) of a motor vehicle transmission system (10), wherein: - The transmission system (10) has a drive motor (14) and a transmission device (18), the drive motor (14) being able to drive the motor vehicle via the transmission device; - The transmission device (18) has a first transmission element (12), a second transmission element (28b), a claw clutch (SE3), an actuation device (40) and a speed sensor assembly (50). - At least one of the transmission elements (12, 28b) is supported in a rotatable manner, such that the transmission elements (12, 28b) can rotate relative to each other; - The claw clutch (SE3) is designed to connect the first transmission element (12) to the second transmission element (28b) in a torsion-resistant manner. - The claw clutch (SE3) has a first clutch half (36) that is torsionally connected to the first transmission element (12) and a second clutch half (38) that is torsionally connected to the second transmission element (28b). - The actuation device (40) is designed to displace the first clutch half (36) along the rotation axis of the transmission device (18); - The stroke sensor assembly (44) has an information transmitter (46) fixedly connected to the first clutch half (36) and a stroke sensor element (48); and - The speed sensor assembly (50) is designed to detect the angular position of the at least one transmission element (28b); Its features are, - In the transmission state of the transmission device (18): The first clutch half (36) is moved along the axis of rotation toward the second clutch half (38) by means of the actuation device (40) until the claw clutch (SE3) is in the closed state; A first stroke sensor signal is assigned to the closed state, the first stroke sensor signal being provided by the stroke sensor assembly (44) in the closed state, and characterizing the first position of the information transmitter (46) detected by means of the stroke sensor element (48) in the closed state; The claw clutch (SE3) is disengaged and thus the state of disengagement of the claw clutch (SE3) is changed, and then the transmission elements (12, 28b) are rotated relative to each other by means of the drive motor (14) and the speed sensor assembly (50) according to the torsional angle. The first clutch half (36) is moved along the rotation axis toward the second clutch half (28b) by means of the actuation device (40) until the first tooth of the claw clutch (SE3) is in the tooth-to-tooth state; The second stroke sensor signal is assigned to the first tooth-to-tooth state, the second stroke sensor signal being provided by the stroke sensor assembly (44) in the first tooth-to-tooth state, and characterizing the second position of the information transmitter (46) detected by means of the stroke sensor element (48) in the first tooth-to-tooth state; and The stroke sensor assembly (44) is calibrated based on the first stroke sensor signal and the second stroke sensor signal.

2. The method according to claim 1, Its features are, The transmission system (10) has a housing (12) to which the first clutch half (36) is torsionally connected.

3. The method according to claim 2, Its features are, The second clutch half (38) is rotatable relative to the housing (12).

4. The method according to any one of the preceding claims, Its features are, The maximum torsion angle corresponds to the tooth width of the teeth (58, 60, 64, 68) of the claw clutch (SE3).

5. The method according to any one of the preceding claims, Its features are, - Each of the clutch halves (36, 38) has engagement teeth (58, 64) and locking teeth (60, 66). -The actuating device (40) moves the first clutch half (36) along the axis of rotation toward the second clutch half (38) until the second tooth of the claw clutch (SE3) is in the tooth-to-tooth state. - In the second tooth-to-tooth state of the claw clutch (SE3), at least one of the engaging teeth (58, 64) of one of the clutch halves (36, 38) is located on one of the locking teeth (60, 66) of the other clutch half (36, 38). - A third stroke sensor signal is assigned to the second tooth-to-tooth state, the third stroke sensor signal being provided by the stroke sensor assembly (44) in the second tooth-to-tooth state, and characterizing the third position of the information transmitter (46) detected by means of the stroke sensor element (48) in the second tooth-to-tooth state; and - The stroke sensor assembly (44) is also calibrated based on the third stroke sensor signal.

6. The method according to claim 5, Its features are, In the first tooth-to-tooth state of the claw clutch (SE3), at least one of the engaging teeth (58, 64) in one clutch half (36, 38) is located on at least one of the engaging teeth (58, 64) in the other clutch half (36, 38).

7. The method according to claims 5 and 6, Its features are, When viewed along the axis of rotation, the corresponding engagement teeth (58, 64) of the corresponding clutch halves (36, 38) are longer than the corresponding locking teeth (60, 66) of the corresponding clutch halves (36, 38).

8. The method according to any one of the preceding claims, Its features are, In the state of the transmission device: - The transmission elements (12, 28b) are stationary; or - At least one or exactly one of the transmission elements (12, 28b) rotates at a speed less than a specified threshold.

9. The method according to any one of the preceding claims, Its features are, In the state of the transmission device: - No relative rotation occurs between the transmission elements (12, 28b); or - The transmission elements (12, 28b) rotate relative to each other at a speed less than a specified limit.

10. The method according to any one of the preceding claims, Its features are, In the state of the transmission device, the transmission elements (12, 28b) are not driven by the drive motor (14).

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