METHOD FOR OPERATING DRIVE ASSEMBLY, DRIVE ASSEMBLY, AND WORK MACHINE

Abstract

The disclosure relates to a method for operating a drive assembly or a work machine. The drive assembly comprises a main drive element, a first and second clutches, and a traction drive. The method comprises the following steps: identifying a target torque progression of the drive assembly, and identifying a slip point at the first clutch, and setting and/or adjusting the direction of the relative rotational speed of the first and second clutch. The rotational speed of the main drive element is set and/or adjusted until the direction of the relative rotational speed of the first and second clutches is the same, and transmitting the torque from the first clutch to the second clutch. The torque of the drive assembly follows the target torque progression, and synchronizing the second clutch. The disclosure further relates to a drive assembly and to a work machine.

Claims

1. A method for operating a drive assembly or a work machine, wherein the drive assembly comprises a main drive element, a first and second clutches, and a traction drive, wherein the method comprises: identifying a target torque progression of the drive assembly, identifying a slip point at the first clutch, setting or adjusting the direction of the relative rotational speed of the first and second clutch, wherein the rotational speed of the main drive element is set or adjusted until the direction of the relative rotational speed of the first and second clutch is the same, transmitting the torque from the first clutch to the second clutch, wherein the torque of the drive assembly follows the target torque progression, and synchronizing the second clutch by the rotational speed of the main drive element being set or adjusted.

2. The method of claim 1, wherein identifying the target torque progression comprises: identifying a first torque at the traction drive, identifying a second torque of the drive assembly and identifying the first torque as a function of the second torque, or identifying the target torque progression as a function of the first or second torque.

3. The method of claim 1, wherein identifying the slip point of the first clutch comprises: opening the first clutch until the rotational speed of the main drive element at the driven side and the rotational speed of the first clutch at the driven side, or the rotational speed of the first clutch at the drive side and the rotational speed of the first clutch at the driven side, are different.

4. The method of claim 3, wherein identifying the slip point of the first clutch comprises: identifying the rotational speed of the main drive element at the driven side and the rotational speed of the first clutch at the driven side, comparing the rotational speed of the main drive element at the driven side with the rotational speed of the first clutch at the driven side, and reducing the torque capacity of the first clutch, when the rotational speed of the main drive element at the driven side and the rotational speed of the first clutch at the driven side are identical, until the rotational speed of the main drive element at the driven side and the rotational speed of the first clutch at the driven side are different.

5. The method of claim 1, wherein the setting or adjusting of the direction of the relative rotational speed of the first and second clutch takes place as a function of an operating mode.

6. The method of claim 1, wherein the method comprises: performing a filling step in which the second clutch is filled with a fluid, or performing an emptying step in which the first clutch is emptied of a fluid.

7. The method of claim 1, wherein the method comprises: closing the second clutch as a function of a calibrating progression, increasing the current strength of the second valve of the second clutch until the torque of the main drive element is different from the torque at the first clutch.

8. The method of claim 1, wherein transmitting of the torque from the first clutch to the second clutch comprises: opening the first clutch as a function of an opening progression, and closing the second clutch as a function of the opening progression of the first clutch.

9. The method of claim 1, wherein synchronizing the second clutch comprises: increasing the rotational speed of the main drive element when the drive assembly is operated in an overrun operating mode, or reducing the rotational speed of the main drive element when the drive assembly is operated in a traction operating mode.

10. The method of claim 1, wherein the following steps take place after the synchronization: completely opening the first clutch, emptying the first clutch, or closing the second clutch.

11. A drive assembly for performing a method, the drive assembly comprising: a main drive element, a first clutch, a second clutch, a traction drive, wherein the method comprises: identifying a target torque progression of the drive assembly, identifying a slip point at the first clutch, setting or adjusting the direction of the relative rotational speed of the first and second clutch, wherein the rotational speed of the main drive element is set or adjusted until the direction of the relative rotational speed of the first and second clutch is the same, transmitting the torque from the first clutch to the second clutch, wherein the torque of the drive assembly follows the target torque progression, and synchronizing the second clutch by the rotational speed of the main drive element being set or adjusted.

12. The drive assembly of claim 11, wherein the drive assembly can be operated in such a way that: a target torque progression of the drive assembly can be identified, a slip point at the first clutch can be identified, and the direction of the relative rotational speed of the first and second clutch can be set or adjusted, wherein the rotational speed of the main drive element is set or adjusted until the direction of the relative rotational speed of the first and second clutches is the same, and the torque can be transmitted from the first clutch to the second clutch, and the second clutch can be synchronized by the rotational speed of the main drive element being set or adjusted.

13. The drive assembly of claim 11, wherein the main drive element is connected to the first and second clutches, and the first or second clutch is connected to the traction drive, and a rotational movement which can be generated by the main drive element or a generatable torque can be imparted to the first or second clutch and can be driven by the rotational movement or the torque of the main drive element, at least of the traction drive.

14. A work machine comprising a drive assembly, the drive assembly comprising: a main drive element, a first clutch, a second clutch, a traction drive, wherein the method comprises: identifying a target torque progression of the drive assembly, identifying a slip point at the first clutch, setting or adjusting the direction of the relative rotational speed of the first and second clutch, wherein the rotational speed of the main drive element is set or adjusted until the direction of the relative rotational speed of the first and second clutch is the same, transmitting the torque from the first clutch to the second clutch, wherein the torque of the drive assembly follows the target torque progression, and synchronizing the second clutch by the rotational speed of the main drive element being set or adjusted.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0141] The disclosure and other advantages and advantageous developments and embodiments of the disclosure are explained in greater detail below both in terms of hardware and in terms of method, on the basis of example embodiments and with reference to the drawings. Component parts of equivalent or comparable function are designated here by the same reference signs.

[0142] FIG. 1 shows a schematic illustration of a first example embodiment of a work machine according to the disclosure, in particular an agricultural towing vehicle in the form of a hauler.

[0143] FIG. 2 shows a schematic illustration of a first example embodiment of the drive assembly according to the disclosure.

[0144] FIG. 3 shows a schematic flow chart of the method according to the disclosure.

[0145] FIG. 4 shows a schematic illustration of a first example embodiment of the method according to the disclosure.

[0146] FIG. 5 shows a schematic illustration of a second example embodiment of the method according to the disclosure.

[0147] FIG. 6 shows a schematic illustration of a third example embodiment of the method according to the disclosure.

[0148] FIG. 7 shows a schematic illustration of a fourth example embodiment of the method according to the disclosure.

[0149] FIG. 8 shows a schematic illustration of the operating modes.

[0150] Like reference numerals are used to indicate like elements throughout the several figures.

DETAILED DESCRIPTION

[0151] FIG. 1 shows a schematic illustration of a first example embodiment of a work machine 10, in particular an agricultural towing vehicle which is in the form of a hauler (tractor). The work machine 10, which is movable in a forward direction V, for example over a field, comprises a supporting frame 16 which is supported on the ground by two axles. The work machine 10 comprises a drive assembly 20, in particular a drive assembly 20 according to the disclosure. The drive assembly 20 comprises a main drive element 22 and a first and second clutch K1, K2 as well as a traction drive 100, in particular an output shaft 102 (see FIG. 2). The main drive element 22 can be designed as an energy machine, in particular as a motor or an internal combustion engine or an electric motor. Moreover, the drive assembly 20 can have a main transmission 24 which can comprise the first and second clutch. The drive assembly 20 can, however, also comprise just the first and second clutch K1, K2 and no main transmission 24.

[0152] The work machine comprises a first vehicle axle 26 and a second vehicle axle 28. The first vehicle axle 26 can be a front axle, and the second vehicle axle 28 can be a rear axle. Moreover, the first vehicle axle 26 can be embodied as a steerable axle. The drive assembly 20 or the work machine 10 can moreover comprise a first differential 30, i.e. in particular a front axle differential. The first vehicle axle 26 can be connected, in particular drivably connected, to the first differential 30. The drive assembly 20 or the work machine 10 can moreover comprise a second differential 32, i.e. in particular a rear axle differential. The second vehicle axle 28 can be connected, in particular drivably connected, to the second differential 32.

[0153] A rotational movement and/or force and/or a torque of the main drive element 22, in particular with different gears, can be transmittable to the output shaft 102, in particular the first output shaft, by means of the main transmission 24 and/or the first and/or second clutch K1, K2. The rotational movement and/or the force and/or the torque of the main drive element 22 can be transmittable to the first and/or second vehicle axle 26, 28 via the output shaft 102, in particular the first output shaft. The first and/or the second vehicle axle 26, 28 convert/converts a rotational movement and/or force and/or a torque of the main drive element 22 into a rotational movement and/or force and/or a torque of one or more ground engagement means 36, for example wheels or tires, and thus into propulsion of the work machine 10. The work machine 10, in particular the drive assembly 20, can comprise one or more ground engagement means 36, illustrated here in the form of tires or wheels 38, 40, which engage with an underlying surface 12 or ground so as to transmit traction forces, and/or by way of which the work machine 10 is supported on the underlying surface 12. The drive assembly 20 is designed for mechanically driving the traction drive 100, in particular the output shaft 102, and/or a first power output 50. The first power output 50 can be designed as a PTO unit. The PTO unit can comprise a PTO transmission and/or a PTO shaft. The PTO unit, in particular the PTO transmission, can be connected at the drive side to the main drive element 22, in particular via a second output shaft. Moreover, the PTO unit, in particular the PTO transmission, can be connectable or connected at the driven side to the PTO shaft. By means of the first power output 50, an implement (not shown) can be drivable which can be attached to the work machine 10 via an interface 34 (for example, a three-point interface).

[0154] The work machine 10 can moreover have a frame 46. The frame 46 can in particular be supported by the tires 38, 40 which are suspended on the first and/or second vehicle axle 26, 28. Specifically, a pair of first wheels 38 is arranged on the first vehicle axle 26, and a pair of second wheels 40 is arranged on the second vehicle axle 28, in particular connected rotatably thereto. Here, the radii of the wheels 38, 40 may differ; in particular, the radius of the two first wheels 38 can be smaller than the radius of the two second wheels 40. Alternatively, the ground engagement means 36 could also be designed and arranged as tracks.

[0155] The work machine 10, in particular the drive assembly 20, can moreover comprise a control unit 42 and/or an input and output unit 44. The control unit 42 can be connected directly to the input and output unit 44 arranged in a cab 48 of the work machine 10. By means of the input and output unit 44, data entered by an operator can be transmitted to the control unit 42 or be received and output by the latter. The work machine 10, in particular alternatively the drive assembly 20, can comprise a control unit 42. The control unit 42 is connected to the main drive element and/or to the first and/or second clutch K1, K2 by signals, and/or operatively coupled thereto and/or connected thereto for transmitting signals and/or carrying data. The control unit 42 is configured to set and/or adjust the rotational speed and/or the torque of the drive assembly 20, in particular of the main drive element 22. The work machine 10, in particular the drive assembly 20, can comprise an energy store 18, here, for example, a battery (rechargeable battery). The energy store 18 can be connected electrically to the drive assembly 20, in particular to the main drive element 22. The control unit 42 can be configured to set and/or adjust a specifiable rotational speed and/or a specifiable torque of the drive assembly 20, in particular of the main drive element 22. However, the control unit 42 can also be connected to the energy store 18 and/or to power electronics 52 of the work machine 10, in particular alternatively to the drive assembly 20 and/or sensors of the drive assembly 20, in particular alternatively of the work machine 10, by signals, and/or can be operatively coupled thereto and/or connected thereto for transmitting signals and/or carrying data. The control unit 42 can be configured to set and/or adjust the drive assembly 20 and/or the work machine 10, preferably to set and/or adjust the rotational speed and/or the torque of the first power output 50 and/or of the traction drive 100, in particular of the output shaft 102. The energy store 18 supplies the electrically driven elements of the drive assembly 20, in particular the main drive element 22, with currents or voltages of suitable frequency and amplitudes in order to provide desired output rotational speeds or torques for the traction drive 100 and/or the first power output 50.

[0156] FIG. 2 shows a schematic illustration of a first example embodiment of the drive assembly 20 according to the disclosure. The drive assembly 20 shown in FIG. 2 corresponds essentially to the drive assembly 20 shown in FIG. 1 such that only details and/or differences will be discussed below. The work machine 10 can comprise the drive assembly 20 as illustrated in FIG. 2.

[0157] The drive assembly 20 comprises a main drive element 22, a first and second clutch K1, K2, and a traction drive 100, in particular an output shaft 102. The drive assembly 20 can, however, also comprise further clutches Kn+1, Km+1.

[0158] The main drive element 22 is connected to the first and second clutch K1, K2. The first and/or second clutch K1, K2 can be connected to the traction drive 100, in particular to the output shaft 102. Alternatively or additionally, the traction drive can, however, also comprise a further transmission, in particular a power-shift transmission and/or a multi-stage transmission, wherein the output shaft can be mechanically connected to the further transmission (not illustrated). The further transmission can comprise a further output shaft and the further output shaft can drive the vehicle axles.

[0159] A rotational movement generatable by means of the main drive element 22 and/or a torque generatable by means of the main drive element 22 can be imparted to the main transmission 24 or to the first and/or second clutch K1, K2, in particular by means of or via a driven shaft of the main drive element 22, via or by means of a first shaft W1. The main drive element 22 can be connected directly to the first shaft W1 or to the first and/or second clutch K1, K2 or be connected to the first shaft W1 or to the first and/or second clutch K1, K2 by means of or via the driven shaft. The main drive element can, however, also be connected to the first shaft W1 via a first transmission stage (not shown) or a first transmission (not shown) or be connected directly to the first clutch K1. Alternatively or additionally, the main drive element 22 can, however, also be connected to the second clutch K2 via a second transmission stage (not shown) or a second transmission (not shown). The traction drive 100, in particular the output shaft 102, is drivable by or by means of the rotational movement and/or the torque of the main drive element 22.

[0160] The first clutch K1, in particular a driven side of the first clutch K1, can be connected to the traction drive 100, preferably to the output shaft 102. In the present case, the first clutch K1 is connected to the traction drive 100 via or by a third transmission stage 104. Additionally, the second clutch K2, in particular a driven side of the second clutch K2, can be connected to the traction drive 100, preferably to the output shaft 102. In the present case, the second clutch is connected to the traction drive 100 via or by a fourth transmission stage 106.

[0161] The further clutches Kn+1, Km+1 can be connected to the traction drive 100, preferably to the output shaft 102, via further transmission stages 108, 110 or further transmissions.

[0162] The drive assembly 20 can be operated in such a way that: [0163] i. A target torque progression of the drive assembly 20, in particular of the traction drive 100, particularly preferably of the output shaft 102, can be identified, and [0164] ii. A slip point at the first clutch K1 can be identified, and [0165] iii. The direction of the relative rotational speed of the first and second clutch K1, K2 can be set and/or adjusted, wherein the rotational speed of the main drive element 22 is set and/or adjusted until the direction of the relative rotational speed of the first and second clutch K1, K2 is the same or identical, and [0166] iv. The torque can be transmitted from the first clutch K1 to the second clutch K2, wherein in particular during the transmission the opening of the first clutch K1 takes place as a function of an opening progression and the closing of the second clutch K2 takes place as a function of the opening progression of the first clutch K1, wherein in particular the torque of the drive assembly, preferably of the traction drive, particularly preferably of the output shaft, follows the target torque progression, and [0167] V. The second clutch K2 can be synchronized by the rotational speed of the main drive element 22 being set and/or adjusted.

[0168] The first and second clutch K1, K2 can also be replaced by the further clutch K.sub.n+1 and the further clutch K.sub.m+1.

[0169] In other words, the control unit 42 can be configured: [0170] To identify a target torque progression of the drive assembly 20, preferably of the traction drive 100, particularly preferably of the output shaft 102, in particular as a function of a shifting procedure of the drive assembly 20, and [0171] To identify a slip point at the first clutch K1, and [0172] To set and/or adjust the direction or the sign of the relative rotational speed of the first and second clutch K1, K2, wherein the control unit 42 is further configured to set and/or adjust the rotational speed of the main drive element 22 until the direction or the sign of the relative rotational speed of the first and second clutch K1, K2 is the same or identical, and [0173] To transmit the torque from the first clutch K1 to the second clutch K2, wherein in particular during the transmission the opening of the first clutch K1 takes place as a function of an opening progression and the closing of the second clutch K2 takes place as a function of the opening progression of the first clutch K1, and [0174] To synchronize the second clutch K2 by the rotational speed of the main drive element being set and/or adjusted.

[0175] FIG. 3 shows a schematic flow chart of the method according to the disclosure. The work machine 10 or the drive assembly 20, in particular in FIG. 1 or 2, can be operatable according to the sequence shown in FIG. 3. The method comprises the following steps:

[0176] Following the start in step 300 is the step 302 in which the identifying of a target torque progression of the drive assembly 20, preferably of the traction drive 100, particularly preferably of the output shaft 102, takes place. Specifically, the identifying of the target torque progression can comprise the following substeps: [0177] Identifying a first torque at the traction drive 100, in particular at the output shaft 102, and/or [0178] Optionally, identifying a second torque of the drive assembly 20 and identifying the first torque as a function of or by means of the second torque, and/or [0179] Identifying the target torque progression as a function of or by means of the first or second torque.

[0180] In step 304, the slip point at the first clutch K1 is identified. Identifying the slip point of the first clutch K1 can comprise the following steps: [0181] Opening the first clutch K1 until the rotational speed of the main drive element at the driven side and the rotational speed of the first clutch K1 at the driven side are different.

[0182] Specifically, identifying the slip point of the first clutch can comprise the following steps: [0183] Identifying the rotational speed of the main drive element 22 at the driven side and the rotational speed of the first clutch K1 at the driven side, and [0184] Comparing the rotational speed of the main drive element 22 at the driven side with the rotational speed of the first clutch K1 at the driven side, and [0185] Reducing the torque capacity of the first clutch K1, preferably reducing a current strength of a first valve V1 (see FIG. 2) of the first clutch K1, when the rotational speed of the main drive element 22 at the driven side and the rotational speed of the first clutch K1 at the driven side are the same or identical, and [0186] Repeating the previous steps until the rotational speed of the main drive element 22 at the driven side and the rotational speed of the first clutch K1 at the driven side are different.

[0187] In a further step 306, the setting and/or adjusting of the direction or the sign of the relative rotational speed of the first and second clutch K1, K2 takes place, wherein the rotational speed of the main drive element 22 is set and/or adjusted until the direction of the relative rotational speed of the first and second clutch K1, K2 is the same. The setting and/or adjusting of the direction or the sign of the relative rotational speed of the first and second clutch K1, K2 can take place as a function of an operating mode.

[0188] In step 308, the torque is transmitted from the first clutch to the second clutch, wherein the torque of the drive assembly 20, preferably of the traction drive, particularly preferably of the output shaft, follows the target torque progression. Specifically, transmitting the torque from the first clutch to the second clutch can comprise the following steps: [0189] Opening the first clutch as a function of an opening progression, and [0190] Closing the second clutch as a function of the opening progression of the first clutch.

[0191] Opening of the first clutch K1 can comprise reducing or lowering the torque capacity, preferably reducing or lowering the current strength of the first valve V1 of the first clutch K1. Closing the second clutch K2 can comprise increasing of the torque capacity, preferably increasing the current strength of a second valve V2 of the second clutch K2.

[0192] Optionally, step 306, or after step 306 and before step 308, can comprise the following steps: [0193] Performing a filling step in which the second clutch is filled with a fluid, and/or [0194] Closing the second clutch as a function of a calibrating progression, in particular increasing the current strength of the second valve of the second clutch until the torque of the main drive element is different from the torque at the first clutch.

[0195] Optionally, the method can comprise the following step after step 308: [0196] Performing an emptying step in which the first clutch is emptied of a fluid.

[0197] The synchronization of the second clutch takes place in step 310 by the rotational speed of the main drive element being set and/or adjusted. The synchronization of the second clutch can comprise the following steps: [0198] Increasing the rotational speed of the main drive element when the drive assembly 20 is operated in an overrun operating mode, or [0199] Reducing the rotational speed of the main drive element when the drive assembly 20 is operated in a traction operating mode.

[0200] During or after step 310, i.e. in particular during or after the synchronization, the following steps can take place: completely opening the first clutch, and/or emptying the first clutch, and/or closing the second clutch K2.

[0201] FIG. 4 shows a schematic illustration of a first example embodiment of the method according to the disclosure, in particular in the operating mode traction with traction upshifting. The method shown in FIG. 4 and described below corresponds essentially to the method in FIG. 3 and described above such that only details and/or differences will be discussed below. The work machine 10 or the drive assembly 20, in particular in FIG. 1 or 2, can be operatable according to the sequence of the method shown in FIG. 4 and described below.

[0202] The lower illustration, in particular the lower diagram, shows:

[0203] Time is plotted in ms at or on the abscissa 400 or x-axis. The torque capacity or the current strength is plotted in mA at or on the first ordinate 402 or y-axis. The torque is plotted in Nm at or on the second ordinate 404 or y-axis. FIG. 4 shows the progression of the torque capacity or the current strengths of the first and second clutch K1, K2 as well as the progression of the torques, of the direction of the relative rotational speed and the rotational speeds of the first and second clutch K1, K2 as well as of the main drive element 22 in the method steps 304 to 310 as well as the steps after method step 310: [0204] The progression of the torque capacity or the current strength 406 of the first clutch K1 or the clutch K1 to be opened, and [0205] The progression of the torque capacity or the current strength 408 of the second clutch K2 or the clutch K2 to be closed, and [0206] The progression of the torque 410, 426 of the main drive element 22.

[0207] The upper illustration, in particular the upper diagram, shows:

[0208] Time is plotted in ms at or on the abscissa 400 or x-axis. The rotational speed is plotted in revolutions per minute at or on the first ordinate 420 or y-axis. The torque is plotted in Nm at or on the second ordinate 422 or y-axis. FIG. 4 further shows: [0209] The progression of the rotational speed 424 of the main drive element 22, and [0210] The progression of the torque 410, 426 of the main drive element 22, and [0211] The progression of the direction of the relative rotational speed 428 in revolutions per minute of the first clutch K1, and [0212] The progression of the torque 430 of the first clutch K1, and [0213] The progression of the direction of the relative rotational speed 432 in revolutions per minute of the second clutch K2, and [0214] The progression of the torque 434 of the second clutch K2.

[0215] The method can here be operated or performed as follows. In method step 304, the torque capacity of the first clutch K1, in particular the current strength of the first valve V1 of the first clutch K1, is regulated very quickly from the maximum torque capacity or from the maximum current into a range in which the first clutch K1 still transmits the applied torque completely without slip. From that point, the torque capacity or the current strength is further reduced until the first clutch K1 reaches the slip point, in particular begins to slip. For the current strength at the first valve, the corresponding torque value thus results at the slip point, in particular at the beginning of the clutch slip. As soon as the slip is recognized at the first clutch K1, the rotational speed of the main drive element 22 is increased in step 306 such that the first and second clutch K1, K2 have the same direction of the relative rotational speed, i.e. in particular the relative speeds of the two clutches K1, K2 have the same direction (same polarity) and therefore do not work against each other. It should be noted that, because the first clutch K1 slips with the full torque and the second clutch K2 furthermore transmits no torque, a change in the rotational speed of the main drive element 22 has no effect on the torque of the traction drive 100, in particular of the output shaft 102. Additionally, in step 306 the first clutch is prefilled with a fill pulse and prepared for the application point. As soon as the setting of the rotational speed of the main drive element 22 is completed, the torque transmission of the clutches can begin in step 308. In step 308, the first clutch K1 is opened as a function of an opening progression and the second clutch K2 is closed as a function of the opening progression of the first clutch K1.

[0216] Specifically, the torque capacity of the first and second clutch can here be set and/or adjusted in such a way that the torque at the traction drive 100, in particular the output shaft 102, follows the target torque progression. The control unit can preferably be configured to activate and/or set and/or adjust the current strength of the valves V1 and V2 such that the torque at the traction drive 100, in particular the output shaft 102, follows the target torque progression. As soon as the second clutch K2 transmits the whole torque, in step 310 the torque capacity of the first and second clutch K1, K2, preferably the current strength of the first and second valve V1, V2, are kept constant, whilst the second clutch K2 with the main drive element 22 is synchronized to the level of the new transmission ratio. As soon as this synchronization is completed, the torque capacity of the first clutch K1, in particular the current strength of the second valve, is set and/or adjusted to 0 (zero). Moreover, the torque capacity of the second clutch K2, in particular the current strength of the second valve, is set and/or adjusted to their maximum values, as a result of which the shifting procedure is completed.

[0217] FIG. 5 shows a schematic illustration of a second example embodiment of the method according to the disclosure, in particular in the operating mode overrun with overrun upshifting. The method shown in FIG. 5 and described below corresponds essentially to the method shown in FIGS. 3 and 4 and described above such that only details and/or differences will be discussed below. The work machine 10 or the drive assembly 20, in particular in FIG. 1 or 2, can be operatable according to the sequence of the method shown in FIG. 5 and described below. The lower illustration, in particular the lower diagram, shows:

[0218] Time is plotted in ms at or on the abscissa 400 or x-axis. The torque capacity or the current strength is plotted in mA at or on the first ordinate 402 or y-axis. The torque is plotted in Nm at or on the second ordinate 404 or y-axis. FIG. 5 shows the progression of the torque capacity or the current strengths of the first and second clutch K1, K2 as well as the progression of the torques, of the direction of the relative rotational speed and the rotational speeds of the first and second clutch K1, K2 as well as of the main drive element 22 in the operating mode overrun with overrun upshifting with the method steps 304 to 310 as well as the steps after method step 310: [0219] The progression of the torque capacity or the current strength 506 of the first clutch K1 or the clutch K1 to be opened, and [0220] The progression of the torque capacity or the current strength 508 of the second clutch K2 or the clutch K2 to be closed, and [0221] The progression of the torque 510, 526 of the main drive element 22.

[0222] The upper illustration, in particular the upper diagram, shows:

[0223] Time is plotted in ms at or on the abscissa 400 or x-axis. The rotational speed is plotted in revolutions per minute at or on the first ordinate 420 or y-axis. The torque is plotted in Nm at or on the second ordinate 422 or y-axis. FIG. 5 further shows: [0224] The progression of the rotational speed 524 of the main drive element 22, and [0225] The progression of the rotational speed 510, 526 of the main drive element 22, and [0226] The progression of the direction of the relative rotational speed 528 in revolutions per minute of the first clutch K1, and [0227] The progression of the torque 530 of the first clutch K1, and [0228] The progression of the direction of the relative rotational speed 532 in revolutions per minute of the second clutch K2, and [0229] The progression of the torque 534 of the second clutch K2.

[0230] In contrast to the operating mode traction with traction upshifting, in the operating mode traction with traction upshifting the rotational speed of the main drive element 22 is reduced after the slip point has been recognized. However, the drive assembly 20 or the work machine 10 can, as in the operating mode traction with traction upshifting, accelerate in the operating mode overrun with overrun upshifting.

[0231] FIG. 6 shows a schematic illustration of a third example embodiment of the method according to the disclosure, in particular in the operating mode traction with traction downshifting. The method shown in FIG. 6 and described below corresponds essentially to the method shown in FIGS. 3 to 5 and described above such that only details and/or differences will be discussed below. The work machine 10 or the drive assembly 20, in particular in FIG. 1 or 2, can be operatable according to the sequence of the method shown in FIG. 6 and described below. The lower illustration, in particular the lower diagram, shows:

[0232] Time is plotted in ms at or on the abscissa 400 or x-axis. The torque capacity or the current strength is plotted in mA at or on the first ordinate 402 or y-axis. The torque is plotted in Nm at or on the second ordinate 404 or y-axis. FIG. 6 shows the progression of the torque capacity or the current strengths of the first and second clutch K1, K2 as well as the progression of the torques, of the direction of the relative rotational speed and the rotational speeds of the first and second clutch K1, K2 as well as of the main drive element 22 in the operating mode traction with traction downshifting with the method steps 304 to 310 as well as the steps after method step 310: [0233] The progression of the torque capacity or the current strength 606 of the first clutch K1 or the clutch K1 to be opened, and [0234] The progression of the torque capacity or the current strength 608 of the second clutch K2 or the clutch K2 to be closed, and [0235] The progression of the torque 610, 626 of the main drive element 22.

[0236] The upper illustration, in particular the upper diagram, shows:

[0237] Time is plotted in ms at or on the abscissa 400 or x-axis. The rotational speed is plotted in revolutions per minute at or on the first ordinate 420 or y-axis. The torque is plotted in Nm at or on the second ordinate 422 or y-axis. FIG. 6 further shows: [0238] The progression of the rotational speed 624 of the main drive element 22, and [0239] The progression of the torque 610, 626 of the main drive element 22, and [0240] The progression of the direction of the relative rotational speed 628 in revolutions per minute of the first clutch K1, and [0241] The progression of the torque 630 of the first clutch K1, and [0242] The progression of the direction of the relative rotational speed 632 in revolutions per minute of the second clutch K2, and [0243] The progression of the torque 634 of the second clutch K2.

[0244] In contrast to the operating mode traction with traction upshifting, in the operating mode traction with traction downshifting the change in the rotational speed of the main drive element 22 at the beginning of the shifting procedure, i.e. before the transmission of the torque from the first to the second clutch K1, K2, is less than at the end of the shifting procedure, i.e. after the transmission of the torque from the first to the second clutch K1, K2.

[0245] FIG. 7 shows a schematic illustration of a fourth example embodiment of the method according to the disclosure, in particular in the operating mode overrun with overrun downshifting. The method shown in FIG. 7 and described below corresponds essentially to the method shown in FIGS. 3 to 6 and described above such that only details and/or differences will be discussed below. The work machine 10 or the drive assembly 20, in particular in FIG. 1 or 2, can be operatable according to the sequence of the method shown in FIG. 7 and described below. The lower illustration, in particular the lower diagram, shows:

[0246] Time is plotted in ms at or on the abscissa 400 or x-axis. The torque capacity or the current strength is plotted in mA at or on the first ordinate 402 or y-axis. The torque is plotted in Nm at or on the second ordinate 404 or y-axis. FIG. 7 shows the progression of the torque capacity or the current strengths of the first and second clutch K1, K2 as well as the progression of the torques, of the direction of the relative rotational speed and the rotational speeds of the first and second clutch K1, K2 as well as of the main drive element 22 in the operating mode overrun with overrun downshifting with the method steps 304 to 310 as well as the steps after method step 310: [0247] The progression of the torque capacity or the current strength 706 of the first clutch K1 or the clutch K1 to be opened, and [0248] The progression of the torque capacity or the current strength 708 of the second clutch K2 or the clutch K2 to be closed, and [0249] The progression of the torque 710, 726 of the main drive element 22.

[0250] The upper illustration, in particular the upper diagram, shows:

[0251] Time is plotted in ms at or on the abscissa 400 or x-axis. The rotational speed is plotted in revolutions per minute at or on the first ordinate 420 or y-axis. The torque is plotted in Nm at or on the second ordinate 422 or y-axis. FIG. 7 further shows: [0252] The progression of the rotational speed 724 of the main drive element 22, and [0253] The progression of the torque 710, 726 of the main drive element 22, and [0254] The progression of the direction of the relative rotational speed 728 in revolutions per minute of the first clutch K1, and [0255] The progression of the torque 730 of the first clutch K1, and [0256] The progression of the direction of the relative rotational speed 732 in revolutions per minute of the second clutch K2, and [0257] The progression of the torque 734 of the second clutch K2.

[0258] In contrast to the operating mode overrun with overrun upshifting, in the operating mode overrun with overrun downshifting the change in the rotational speed of the main drive element 22 at the beginning of the shifting procedure, i.e. before the transmission of the torque from the first to the second clutch K1, K2, is greater than at the end of the shifting procedure, i.e. after the transmission of the torque from the first to the second clutch K1, K2.

[0259] FIG. 8 shows a schematic illustration of the operating modes. The operating modes shown in FIG. 8 and described below correspond essentially to the operating modes shown in FIGS. 3 to 7 and described above such that only details and/or differences will be discussed below. The work machine 10 or the drive assembly 20, in particular in FIG. 1 or 2, can be operatable according to the operating modes shown in FIG. 8 and described below.

[0260] The method according to the disclosure can be operatable or performable in four different operating modes: [0261] The operating mode traction with traction upshiftingfor example, acceleration of the drive assembly 20 or the work machine 10 against resistance, for example uphill or with significant rolling resistance. [0262] The operating mode traction with traction downshiftingfor example, the drive assembly 20 or the work machine 10 can drive against resistance (for example, uphill with a trailer) and can no longer, for example, maintain the speed in the current gear and have to shift down because of the power limitation. [0263] The operating mode overrun with overrun upshiftingfor example, acceleration of the drive assembly 20 or the work machine 10 driving downhill. The work machine 10 has to shift up because the drive assembly 20, in particular the main drive element 22, has reached a speed limitation. The flow of force in the drive train can be decelerated. [0264] The operating mode overrun with overrun downshiftingfor example, decelerating or braking the drive assembly 20 or the work machine 10 driving downhill with the deceleration power of the drive assembly 20 for limiting the vehicle speed.

[0265] The four operating modes are illustrated in a diagram in FIG. 8 as belonging to the four quadrants. The torque is plotted in Nm at or on the abscissa 800 or x-axis. The acceleration, in particular the acceleration of the work machine 10, is plotted at or on the first ordinate 802 or y-axis.

[0266] While the above describes example embodiments of the present disclosure, these descriptions should not be viewed in a limiting sense. Rather, other variations and modifications may be made without departing from the scope and spirit of the present disclosure as defined in the appended claims.