Method and control device for operating an automated or automated switching gear of a motor vehicle

Abstract

The invention relates to a method and a control device for operating an automatic or automated switching transmission of a motor vehicle, comprising: at least one switching group, each of which consists of two form-fitting switching elements that can be actuated by a common pneumatic actuator having a three-position cylinder; and a running clutch associated with the transmission input shaft; the method has at least the following step: in order to transfer the switching group from one of the two switching elements to the two open states, the two pressure chambers of the three-position cylinder are actuated via the valves such that the opening displacement force is greater than the closing displacement force. Monitoring a movement of the actuator as a function of the opening displacement force and the closing displacement force, and if it is confirmed that the movement is greater than a boundary value, inferring that there is no jamming on the switching element; if it is confirmed that the movement is less than the limit value, it is concluded that there is a jam on the shift element, whereupon the closing displacement force is reduced and / or the driving clutch is opened in order to release the jam.

Description

Technical Field

[0001] The invention relates to a method for operating an automatic or automated shifting transmission of a motor vehicle. The invention also relates to a control device for operating an automatic or automated shifting transmission. Background Art

[0002] The transmission of a motor vehicle converts speed and torque, thereby providing the tractive force supply of the motor vehicle's drive unit to the output. To change the transmission ratio of the transmission, a shift from an actual gear to a target gear, or a gear change, can be performed in the transmission. To this end, the transmission (i.e., a switching transmission) has shifting elements, which can be implemented as positive-locking shifting elements as well as friction-locking shifting elements. Friction-locking shifting elements are, in particular, clutches and brakes. Positive-locking shifting elements are, in particular, claws. When performing a shift, or a gear change, in the switching transmission, at least one previously open shifting element is closed, and at least one previously closed shifting element is opened. Actuators that interact with the shifting elements are used to actuate the respective shifting elements.

[0003] DE 10 2021 207 816 B3 discloses the ability to combine two form-locking switching elements into a switching group that can be actuated by a common actuator. The actuator comprises a three-position cylinder and a piston that can be displaced in the three-position cylinder, wherein a valve cooperates with the pressure chamber of the three-position cylinder. By actuating the valve of the three-position cylinder, either one of the two form-locking switching elements can be shifted into a closed position and thus engaged or closed, or alternatively, both form-locking switching elements can be brought into a neutral position and thus engaged or opened. It is not possible for both form-locking switching elements in the switching group to simultaneously occupy a closed position and thus be closed.

[0004] If a switching group with two positive-locking shifting elements adopts a state in which one of the shifting elements is closed, thus engaged, and if the switching group is to be transferred from this state to a state in which both positive-locking shifting elements are open, thus engaged, the piston of the three-position cylinder must be transferred to one of the neutral positions via the valve that controls the actuator. Due to various influences, this can lead to the problem that the positive-locking shifting element to be opened becomes blocked, making it impossible to open the positive-locking shifting element to be opened. Summary of the Invention

[0005] Based on this, the object of the present invention is to propose a method and a control device for operating an automatic or automated transmission of a motor vehicle, by means of which the blocking of the form-locking switching elements to be disconnected of a switching group having two form-locking switching elements driven by a common pneumatic actuator with a three-position cylinder can be counteracted.

[0006] This object is achieved by a method according to claim 1 and by a control device according to claim 8 .

[0007] In order to transfer the switching group from a state in which one of the two form-locked switching elements is closed to a state in which both of the form-locked switching elements of the switching group are disconnected, the pressure chamber of the three-position cylinder of the actuator cooperating with the switching group, which causes the switching element to be disconnected to be disconnected by its pressure-dependent disconnecting displacement force acting on the piston of the three-position cylinder, and the pressure chamber which causes the switching element to be disconnected to be closed by its pressure-dependent closing displacement force acting on the piston of the three-position cylinder, are both driven via valves so that the disconnecting displacement force is greater than the closing displacement force.

[0008] The movement of the actuator, which is a function of the opening and closing shifting forces, is monitored, wherein if a movement of the actuator is detected that is greater than a limit value, it is concluded that there is no jamming at the form-locking shifting element to be opened, and conversely, if a movement of the actuator is detected that is less than a limit value, it is concluded that there is jamming at the form-locking shifting element to be opened, wherein the closing shifting force is then reduced and / or the driving clutch is opened to release the jamming.

[0009] The present invention makes it possible to reliably disconnect a form-locking shifting element of a shifting group having two form-locking shifting elements and thus transfer the shifting group to a neutral position, more precisely to reduce or even avoid the risk of overshooting of the three-position cylinder in a position in which both form-locking shifting elements are disconnected and thus engaged, and to relieve any jamming that may have formed on the form-locking shifting element to be disconnected.

[0010] Preferably, in order to release the jam, the closing displacement force is first reduced and the driving clutch is only opened when the jam has not been released despite the reduction of the closing displacement force. This is particularly preferred in order to release the jam when a jam is detected on the form-locking shift element to be opened.

[0011] Preferably, if it is detected that the piston is moving due to a reduction in the closing shifting force and / or a disengagement of the driving clutch, the reduction in the closing shifting force and / or the disengagement of the driving clutch is terminated and, if necessary, reversed. This prevents the piston of the three-position cylinder from being displaced too far and moving into a position in which both positively locking shift elements of the shift group are no longer disengaged and thus disengaged.

[0012] Preferably, a timer is initialized, wherein the timer is started after the shift group begins to transition from a state in which one of the two positive-locking shift elements is closed to a state in which both positive-locking shift elements of the shift group are open, or at the beginning of the transition. If a jam is detected, a check is then performed to see whether the timer has expired and / or whether the temperature is below a threshold value. If the timer has not expired or if the temperature is above a threshold value, neither the closing shifting force nor the driving clutch is opened. If the timer has expired and / or the temperature is below a threshold value, the closing shifting force is reduced and / or the driving clutch is opened. Only when the timer has expired, i.e., when the shift group has had sufficient time to be actuated via the pneumatic actuator so that both positive-locking shift elements can be opened and thus disengaged, is the closing shifting force reduced and / or the driving clutch opened if a jam is detected. If the temperature of the switching transmission or the ambient temperature is below a threshold value, the timer is not waited for to expire. Instead, upon detection of a jam, the closing shifting force is immediately reduced and / or the driving clutch is opened to resolve the jam.

[0013] Preferred developments are apparent from the dependent claims and the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Without being limited thereto, the embodiments of the present invention are explained in detail with reference to the accompanying drawings, wherein:

[0015] Figure 1 A block diagram showing a drive train of a motor vehicle;

[0016] Figure 2 An exemplary schematic diagram showing a drive train of a motor vehicle;

[0017] Figure 3 Show Figure 2 details in the region of a switching group consisting of two positive-locking switching elements and an actuator cooperating with the switching group;

[0018] Figure 4 A signal flow diagram is shown to further explain the present invention;

[0019] Figure 5 A timing diagram is shown to further explain the present invention. DETAILED DESCRIPTION

[0020] Figure 1 A block diagram of a drive train for a motor vehicle is shown. Figure 1The drive train comprises a drive unit and an automatic or automated switching transmission 2, which is connected between the drive unit 1 and the driven end 3. A clutch 5 is connected between the drive unit 1 and the automatic or automated switching transmission 2. The clutch is also called a separation clutch or starting clutch. When the separation clutch 5 is disengaged, the drive unit 1 is disconnected from the input shaft 6 of the transmission 2. The driven end 3 is coupled to the output shaft 8 of the automated switching transmission 2. The switching transmission 2 has a plurality of switching elements, which are not Figure 1 . Thus, the automated shifting transmission 2 has a plurality of positive-locking shifting elements. In this automated shifting transmission 2, shifting is performed with power interruption. The automated shifting transmission 2 can have a plurality of friction-locking shifting elements and at least one positive-locking shifting element. In this automated shifting transmission 2, shifting is typically performed with power shifting.

[0021] Figure 1 Also shown are a transmission control unit 31 and an engine control unit 32. The transmission control unit 31 is used to control and / or regulate the operation of the shifting transmission 2. To this end, the transmission control unit 31 exchanges data with the shifting transmission 2. The engine control unit 32 controls and / or regulates the operation of the drive unit 1 and, to this end, exchanges data with the drive unit 1. The transmission control unit 31 and the engine control unit 32 also exchange data with each other.

[0022] Figure 2 The drive train of a motor vehicle is shown, which has an exemplary embodiment of a shift transmission 2 designed as an automated shift transmission, wherein: Figure 2 The automated switching transmission 2 is implemented as a group transmission. It should be noted that Figure 2 The shift transmission shown in is purely exemplary. The invention can also be used in conjunction with other shift transmissions having at least one shift group each consisting of two positive-locking shift elements.

[0023] Figure 2 The automated group transmission comprises a main transmission 9, a half-gear group 10 connected upstream of the main transmission 9 in terms of drive technology, and a double-gear group 11 connected downstream of the main transmission 9 in terms of drive technology. The main transmission 9 is designed as a direct gear transmission in the form of a countershaft structure and has two countershafts 21, 22. Figure 2The transmission brake 4 acting on the countershaft 21 is shown. The countershaft 21 can be decelerated via the transmission brake 4. The main transmission 9 is designed with three transmission ratios G1, G2, and G3 for forward travel, and one transmission ratio R for reverse travel. The idler gears of the transmission ratios G1, G2, and R are each rotatably mounted on the main shaft 30 and can be shifted via associated form-locking shifting elements 15, 16, 18, and 19, which are designed as claws. The associated fixed gears are mounted in a rotationally fixed manner on the countershafts 21 and 22. The two shifting elements 15 and 16 and the two shifting elements 18 and 19 each form a shifting group 17 or 20. The shifting elements 15, 16 and the shifting elements 18 and 19 of the shifting groups 17 and 20 of the main transmission 9 of the sub-transmission are non-synchronized form-locking shifting elements.

[0024] exist Figure 2 In the example, the semi-gear group 10 of the automated group transmission is designed with two stages and is also implemented as a countershaft. The two transmission ratio steps K1 and K2 of the semi-gear group 10 form two switchable input fixed-ratio transmission pairs of the main transmission 9. The two transmission ratio steps K1 and K2 have a small transmission ratio difference. The idler gear of the first transmission ratio step K1 is rotatably supported on the input shaft 6. The idler gear of the second transmission ratio step K2 is rotatably supported on the main shaft 30. The fixed gears of the two transmission ratio steps K1 and K2 of the semi-gear group 10 are respectively arranged in a rotationally fixed manner with the extended countershafts 21 and 22 on the input side of the main transmission 9. The synchronously designed shifting elements 12 and 13 of the semi-gear group 10 (so-called synchronous shifting elements) are combined into a common shifting group 14. The shifting elements 12 and 13 of the shifting group 14 of the semi-gear group 10 of the group transmission are synchronized, form-locking shifting elements.

[0025] The multi-speed group 11 of the automated group transmission, which is arranged downstream of the main transmission 9, is also designed in two stages, but is constructed as a planetary transmission 24. The sun gear 25 of the planetary transmission 24 is connected in a rotationally fixed manner to the main shaft 30 of the main transmission 9, which is extended on the output side. The planet carrier 27 of the planetary transmission 24 is coupled in a rotationally fixed manner to the output shaft 8 of the group transmission. The ring gear 26 of the planetary transmission 24 is connected to a shift group 23 having two asynchronous shift elements 28 and 29, via which the multi-speed group 11 can be switched alternately to the slow-moving stage L by connecting the ring gear 26 to the stationary housing part 7 and to the fast-moving stage S by connecting the ring gear 26 to the planet carrier 27. Like the shift elements 15 , 16 and 18 , 19 of the shift groups 17 , 20 of the main transmission 9 of the automated group transmission, the shift elements 28 , 29 of the shift group 23 of the multi-speed group 11 are also asynchronous, form-locking shift elements.

[0026] Figure 3 The switching transmission 2 is shown in detail in the area of ​​the switching group 17 comprising the positive-locking switching elements 15, 16, together with the actuator 33. The actuator 33 is a pneumatic actuator having a three-position cylinder 34 and a piston 35 with a piston rod 36 that can be displaced within the three-position cylinder 34. The piston 35 or the piston rod 36 can act on a switching sleeve 39 via a shift fork 37 and a shift rail 38. The switching sleeve 39 can thus be displaced by means of the actuator.

[0027] exist Figure 3 In the position of the piston 35 in the three-position cylinder 34 shown in FIG, the sliding sleeve 39 occupies a position in which both positive-locking switching elements 15, 16 are in a neutral position, in which both positive-locking switching elements 15, 16 are therefore in a disconnected or hung-out state. Figure 3 Starting from the positioning of the piston 35 shown in FIG, the switching element 15 is to be closed, and the piston 35 is moved from Figure 3 The position shown in FIG is shifted to the left, and if the form-locking switching element 16 is to be shifted, the piston 35 is displaced from Figure 3 The position shown in is shifted to the right.

[0028] The displacement of the piston 35 in different displacement directions is achieved by filling or evacuating the pressure chambers 40 , 41 of the three-position cylinder 34 with a pneumatic pressure medium, ie compressed air, wherein for this purpose a valve 42 , 43 cooperates with each pressure chamber 40 , 41 .

[0029] By actuating the valves 42 , 43 of the actuator 33 and thus filling or emptying the pressure chambers 40 , 41 of the three-position cylinder 34 , the switching group 17 is also transferred from a state in which one of the positively locking switching elements 15 , 16 is closed and thus engaged to a state in which both positively locking switching elements 15 , 16 are open and thus engaged.

[0030] Combine Figure 3 The details described for the switching group 17 can also be used for the switching groups 14 , 20 and 23 , wherein, however, the form-locking shift elements 12 , 13 of the switching group 14 are synchronous form-locking shift elements.

[0031] The present invention now relates to the details of transferring a switching group 17 having two positive-locking shifting elements 15, 16, which can be controlled by a pneumatic actuator 33 having a three-position cylinder 34 and a piston 35, from a state in which one of the two positive-locking shifting elements 15, 16 of the switching group 17 is closed to a state in which both positive-locking shifting elements 15, 16 of the switching group 17 are open. To this end, the pressure chambers 40, 41 of the three-position cylinder 34, which, by virtue of its pressure-dependent opening displacement force acting on the piston 35 of the three-position cylinder 34, opens the positive-locking shifting element to be opened from the closed position, and the pressure chambers 41, 40 of the three-position cylinder 34, which, by virtue of its pressure-dependent closing displacement force acting on the piston 35 of the three-position cylinder 34, closes the positive-locking shifting element to be opened, are both controlled via valves and filled or emptied of pressure medium so that the opening displacement force is greater than the closing displacement force.

[0032] For example, if the switching group 17 is to be transferred to a state in which both switching elements 15, 16 are open when the form-locking switching element 16 is closed, the valve 43 is controlled so that an opening displacement force is set in the pressure chamber 41 which is greater than the closing displacement force in the pressure chamber 40 due to the activation of the valve 42. Figure 3 The positive locking switching element 15 is closed, and the switching group 17 is to be transferred to a state in which both the positive locking switching elements 15 and 16 are open. Figure 3 In the pressure chamber 40, an opening displacement force is set by the control valve 42, which is greater than the closing displacement force set in the pressure chamber 41 by the control valve 43. This allows the piston 35 to move smoothly and prevents overshoot of the switching group 17.

[0033] According to the invention, the resulting movement of the actuator 33 as a function of the opening and closing displacement forces is monitored, more precisely preferably by means of a sensor 44 which detects the movement of the piston 35 or the piston rod 36 .

[0034] If a movement of the actuator 33 greater than a limit value is detected, it is concluded that no jamming is present at the form-locking shift element to be disengaged. Conversely, if a movement of the actuator 33 less than a limit value is detected, it is concluded that jamming is present at the form-locking shift element to be disengaged, wherein the closing shift force is then reduced and / or the driving clutch 5 is disengaged to release the jamming.

[0035] The following will refer to Figure 4 and Figure 5 Describes further details of the present invention, wherein Figure 4 shows a signal flow diagram, and Figure 5 Shows the timing diagram.

[0036] Figure 4 Block 45 explains the start of the method according to the invention. In a subsequent step 46, a timer is initialized.

[0037] In the subsequent block 47 , it is checked whether a state in which both positively locking switching elements 15 and 16 are to be opened is required for the switching group 17 and whether the switching group 17 assumes a state different from this state in which both positively locking switching elements 15 and 16 are to be opened.

[0038] If this is not the case, i.e., either the switching group 17 is not required to be in a state in which both positive-locking switching elements 15, 16 are open, or the switching group 17 already occupies a state in which both positive-locking switching elements 15, 16 are open, then a branch is made from block 47 to block 48, wherein a status signal can be set in block 48, which indicates that no further measures are required with regard to detecting a jam on the switching group 17 and with regard to clearing a jam that may have been detected.

[0039] If, on the other hand, it is confirmed in block 47 that a state in which both positively locking switching elements 15 and 16 are disconnected is required for the switching group 17 and that the switching group 17 does not occupy a state which ensures that both switching elements 15 , 16 are in the disconnected position, then a branch is made from block 47 to block 49 , wherein the movement of the actuator 33 is monitored in block 49 , which movement is dependent on the opening displacement force and the closing displacement force acting on the piston 35 of the actuator 33 .

[0040] As already mentioned, the opening and closing displacement forces originate from the actuation of the valves 42 , 43 and from the filling or emptying of the pressure chambers 40 , 41 with compressed air.

[0041] If it is determined in block 49 that there is no jamming at the form-locking shift element to be opened and therefore at the switching group 17, then the process branches from block 49 to block 48. If, on the other hand, it is determined in block 49 that there is jamming at the form-locking shift element of the shift element 17 to be opened, then the process branches from block 49 to block 50.

[0042] The detection of a jam is carried out in the manner described above by monitoring the movement of the actuator 33 by means of the sensor 44 .

[0043] In block 50, a check is performed to determine whether a timer has expired after or at the start of the transition of the switching group 17 from the closed state of one of the form-locking shift elements 15, 16 to the open state of both form-locking shift elements. Block 50 also checks whether the temperature, in particular the temperature of the transmission or the surrounding environment, is below a limit value.

[0044] If it is determined in block 50 that the timer has not expired or the temperature is above the limit value, then the block 50 is branched to block 51, wherein the timer is increased by one time increment in block 51. Then, block 51 branches back to block 50.

[0045] If it is confirmed in block 50 that the timer has expired or the temperature is below a limit value, the circuit branches from block 50 to block 52, wherein in block 52 it is checked whether a jam still exists on the form-locking switching elements 15, 16 of the switching group 17 to be disconnected, i.e. whether both form-locking switching elements 15, 16 of the switching group 17 are disconnected.

[0046] If this is not the case, that is, if it is determined in block 52 that both positive-locking shifting elements 15, 16 of the shifting group 17 are open, then the process branches from block 52 to block 48. If, on the other hand, it is determined in block 52 that the positive-locking shifting element to be opened cannot be opened, then the process branches from block 52 to block 53, wherein a status signal is set in block 53, which indicates that further steps are required to unblock the jam.

[0047] For this purpose, a branch is made from block 53 to block 54 , wherein in block 54 the closing shifting force is reduced for the form-locking shift element to be disengaged and / or the driving clutch 5 is disengaged in order to release the blocking.

[0048] Additional details are provided by Figure 5 The timing diagram shows that, Figure 5 , multiple time curves are shown over time t. Thus, curve 55 visualizes the target state for shift group 17. Curve 57 visualizes the measurement signal of displacement sensor 44, curves 58 and 59 visualize the actuation of valves 42 and 43 of pressure chambers 40 and 41. Curve 60 visualizes the actuation of drive clutch 5, and curve 56 visualizes a status signal indicating whether a jamming of transmission 17 has been detected.

[0049] exist Figure 5 Before the time t1 in , the switching group 17 is in a closed state in which one of its form-locking switching elements 15 , 16 is closed.

[0050] At the time t1 , the target state 55 changes, more precisely, the switching group 17 is to be transferred to a state in which both positive-locking shift elements 15 , 16 are open.

[0051] Starting from time point t1, in the sense of change curves 58 and 59, pneumatic pressure is adjusted in the pressure chambers 40 and 41 of the three-position cylinder 34 by driving the valves 42 and 43 of the pneumatic actuator 33, so that the closing displacement force that presses the form-locking switching element to be disconnected into the closed position is smaller than the disconnection displacement force existing in the other chamber that disconnects the form-locking switching element to be disconnected from the closed position.

[0052] At time t2, the presence of a jamming at the form-locking switching element of the switching group 17 to be opened is detected by the measurement signal 57 of the displacement sensor 44. Figure 5 , the corresponding state signal 56 changes from state I (no jam) to state II (jammed) at time t2.

[0053] Therefore, in Figure 5 In FIG. 5 , starting from the time t2 , the closing displacement force, which actually presses the form-locking shift element to be opened into the closed position, is reduced as a function of the valve actuation 58 .

[0054] Here, in Figure 5 In the example, it is confirmed that, despite the reduction of the closing displacement force, at the time t3, there is still a blocking resistance on the form-locking switching element, so that Figure 5 At time t3, the reduction in the closing shifting force is terminated and reversed. However, in order to release the jam, the driving clutch 5 is further disengaged according to the curve 60, so that at time t4, the jam is released by further disengaging the driving clutch 5, which has already been in slip mode according to the signal curve 60 since time t1.

[0055] Therefore, in Figure 5 In FIG. 1 , the blocking is released at time t4 , wherein the state signal changes back to state I according to curve 56 , which indicates that there is no blocking at the switching group 17 .

[0056] At time t5 , the transition of the switching group 17 to the state in which both positive-locking shift elements are open is terminated.

[0057] The limit value for the movement of the actuator 33 , on the basis of which a blocking at the form-locking shift element to be disengaged is detected, can be gear-dependent and / or temperature-dependent.

[0058] Furthermore, the valve actuation for reducing the closing displacement force when a jam is detected can be gear-dependent and / or temperature-dependent.

[0059] The actuation 60 for disengaging the driving clutch can also be gear-dependent and / or temperature-dependent.

[0060] The invention also relates to a control device which is configured to automatically carry out the above-described method. The control device is preferably a transmission control device 31 , which is preferably an electronic transmission control device.

[0061] The electronic transmission control device has hardware and software components. The hardware components include data interfaces for exchanging data with components involved in implementing the method according to the present invention, such as displacement sensor 44 and valves 42 and 43. The hardware components also include a processor for data processing and a memory for data storage. The software components include program modules implemented in the control device for executing the method according to the present invention.

[0062] For the control device to transfer the switching group 17 from a closed state in which one of the two form-locking shifting elements 15, 16 is closed to a state in which both form-locking shifting elements 15, 16 are open, the control device actuates via valves the pressure chamber 40, 41 of the three-position cylinder 34 whose pressure-dependent opening displacement force acting on the piston 35 of the three-position cylinder 34 opens the shifting element to be opened, and the pressure chamber 40, 41 whose pressure-dependent closing displacement force acting on the piston 35 of the three-position cylinder 34 closes the shifting element to be opened, such that the opening displacement force is greater than the closing displacement force. The control device monitors the movement of the actuator 33, which is dependent on the opening and closing displacement forces, based on the measurement signal of the sensor 44. If the control device detects that the movement of the actuator 33 is greater than a limit value, the control device concludes that there is no jamming at the form-locking shifting element to be opened. If the control device detects that the movement of the actuator 33 is less than a limit value, it concludes that a jam is present at the form-locking shift element to be disengaged, wherein the control device then reduces the closing shift force to remove the jam and / or actuates the disengagement of the driving clutch 5 .

[0063] Reference Signs List

[0064] 1 drive unit

[0065] 2 Group transmission device

[0066] 3 Driven end

[0067] 4 Transmission brake

[0068] 5 Clutch

[0069] 6 Input shaft

[0070] 7 Shell part

[0071] 8 Output shaft

[0072] 9 Main transmission

[0073] 10 Half-block group

[0074] 11x block group

[0075] 12 Synchronous switching components

[0076] 13 Synchronous switching components

[0077] 14 Switch Group

[0078] 15 Switching elements

[0079] 16 Switching elements

[0080] 17 Switching elements

[0081] 18 Switching elements

[0082] 19 Switching elements

[0083] 20 Switch Group

[0084] 21 Countershaft

[0085] 22 Countershaft

[0086] 23 Switch Group

[0087] 24 Planetary gears

[0088] 25 Sun gear

[0089] 26 Ring gear

[0090] 27 Planetary carrier

[0091] 28 Switching elements

[0092] 29 Switching elements

[0093] 30 spindle

[0094] 31 Transmission control equipment

[0095] 32 Engine Control Equipment

[0096] 33 Actuator

[0097] 34 three-position cylinder

[0098] 35 piston

[0099] 36 piston rod

[0100] 37 Switch fork

[0101] 38 Switching rails

[0102] 39 Moving Sleeve

[0103] 40 pressure chamber

[0104] 41 pressure chamber

[0105] 42 valve

[0106] 43 valve

[0107] 44 sensors

[0108] 45 yuan

[0109] 46 pieces

[0110] 47 yuan

[0111] 48 yuan

[0112] 49 yuan

[0113] 51 yuan

[0114] 52 pieces

[0115] 53 yuan

[0116] 54 pieces

[0117] 55 Toggle group target state

[0118] 56 Status signal: jam detection

[0119] 57 Displacement sensor measurement signal

[0120] 58 Valve drive control

[0121] 59 Valve drive control

[0122] 60 Driving clutch actuation

Claims

1. A method for operating an automatic or automated shifting transmission (2) of a motor vehicle, the shifting transmission having at least one shifting group (14, 17, 20, 23), the shifting groups each consisting of two positively locking shifting elements (12, 13, 15, 16, 18, 19, 28, 29), the positively locking shifting elements being controllable by a common pneumatic actuator (33) having a three-position cylinder (34) so ​​that either one of the two shifting elements is closed or both shifting elements are open, and the shifting transmission having a driving clutch (5) associated with a transmission input shaft (6), the driving clutch being closed in order to couple a drive unit (1) to the shifting transmission (2) and being open in order to decouple the drive unit (1) from the shifting transmission (2), the method comprising at least the following steps: In order to transfer the switching group from a closed state in which one of the two positively locking switching elements is closed to a state in which both positively locking switching elements of the switching group are open, the pressure chamber (40, 41) of the three-position cylinder (34) whose pressure-dependent disconnection displacement force acting on the piston (35) of the three-position cylinder disconnects the switching element to be disconnected and the pressure chamber (40, 41) whose pressure-dependent closing displacement force acting on the piston (35) of the three-position cylinder (34) closes the switching element to be disconnected are both controlled via valves (42, 43) so that the disconnection displacement force is greater than the closing displacement force. monitoring the movement of the actuator (33) in dependence on the opening displacement force and the closing displacement force, in, If it is determined that the movement of the actuator (33) is greater than a limit value, it is concluded that there is no jamming at the form-locking switching element to be disengaged, If it is determined that the movement of the actuator (33) is less than a limit value, it is inferred that there is a jamming on the form-locking shifting element to be disengaged, wherein the closing displacement force is reduced and / or the driving clutch (5) is disengaged in order to relieve the jamming.

2. The method according to claim 1, characterized in that In order to release the jam, the closing displacement force is first reduced, and the driving clutch (5) is disengaged only if the jam is not released despite the reduction of the closing displacement force.

3. The method according to claim 1 or 2, characterized in that: When a movement of the actuator (33) due to a reduction in the closing displacement force and / or an opening of the driving clutch (5) is detected, the reduction in the closing displacement force and / or the opening of the driving clutch (5) is terminated.

4. The method according to claim 1, 2 or 3, characterized in that: When a movement of the actuator (33) due to a reduction in the closing displacement force and / or an opening of the driving clutch (5) is detected, the reduction in the closing displacement force and / or the opening of the driving clutch (5) is reversed.

5. The method according to any one of claims 1 to 4, characterized in that The limit value is step-dependent and / or temperature-dependent.

6. The method according to any one of claims 1 to 5, characterized in that The reduction of the closing displacement force and / or the opening of the driving clutch (5) is gear-dependent and / or temperature-dependent.

7. The method according to any one of claims 1 to 6, characterized in that After the switching group begins to transition from a closed state of one of the two form-locking shifting elements to a state in which both form-locking shifting elements of the switching group are open or when the switching group begins to transition from a closed state of one of the two form-locking shifting elements to a state in which both form-locking shifting elements of the switching group are open, a timer is started, If a jam is detected, a check is performed to determine whether the timer has expired and / or whether the temperature is below a limit value. If the timer has not expired or the temperature is above the limit value, the closing displacement force is neither reduced nor the driving clutch (5) is opened, If the timer expires and / or the temperature falls below the limit value, the closing displacement force is reduced and / or the driving clutch (5) is opened.

8. A control device for operating an automatic or automated shifting transmission of a motor vehicle, the shifting transmission having at least one shifting group (14, 17, 20, 23), each of which is composed of two positively locking shifting elements (12, 13, 15, 16, 18, 19, 28, 29), the positively locking shifting elements being controllable by a common pneumatic actuator (33) having a three-position cylinder (34) so ​​that either one of the two shifting elements is closed or both shifting elements are open, and the shifting transmission having a driving clutch (5) associated with a transmission input shaft (6), the driving clutch being closed in order to couple a drive unit (1) to the shifting transmission (2), and being open in order to decouple the drive unit (1) from the shifting transmission (2), in, In order to transfer the switching group from a closed state in which one of the two form-locking switching elements is closed to a state in which both form-locking switching elements of the switching group are open, the control device drives the pressure chamber (40, 41) of the three-position cylinder (34) via the valve so that its pressure-dependent disconnection displacement force acting on the piston (35) of the three-position cylinder disconnects the switching element to be disconnected, and the pressure chamber (40, 41) of the three-position cylinder (34) so ​​that its pressure-dependent closing displacement force acting on the piston (35) of the three-position cylinder (34) closes the switching element to be disconnected, so that the disconnection displacement force is greater than the closing displacement force. The control device monitors the movement of the actuator (33) as a function of the opening displacement force and the closing displacement force, If the control device detects that the movement of the actuator (33) is greater than a limit value, the control device concludes that there is no jamming on the form-locking switching element to be disconnected. If the control device detects that the movement of the actuator (33) is less than a limit value, the control device infers that there is a jamming on the form-locking shifting element to be disconnected, wherein the control device then reduces the closing displacement force and / or controls the driving clutch (5) to be disconnected in order to release the jamming.

9. The control device according to claim 8, characterized in that The control device is set up to automatically carry out the method according to any one of claims 1 to 7 .

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