Shift monitoring method, control device and transmission

Abstract

The invention discloses a gear shifting monitoring method, a control device and a transmission, and relates to the technical field of transmissions.The gear shifting monitoring method comprises the steps that S10, when a vehicle shifts gears, the actual speed ratio of the transmission is obtained, and whether gear shifting exceeds the limit or not is judged according to the actual speed ratio; s20, when it is judged that gear shifting exceeds the limit, the coupling state of a dog clutch in the transmission during gear shifting is obtained; and S30, according to the coupling state of the dog clutch, an alarm device is controlled to output fault prompt information, the gear shifting process is monitored through the actual speed ratio so as to determine whether a fault occurs in the gear shifting process or not, whether the dog clutch participates in the gear shifting process or not is determined through the coupling state of the dog clutch, and the gear shifting process is completed. Therefore, the alarm device can output corresponding fault prompt information, the fault condition of the transmission can be accurately judged, and the gear shifting process of the transmission can be accurately monitored.

Description

Technical Field

[0001] The present invention relates to the technical field of transmissions, and particularly to a shifting monitoring method, a control device, and a transmission. Background Art

[0002] Currently, the automotive transmission ratio, also known as the speed ratio, refers to the ratio of the rotational speeds of the two transmission mechanisms before and after the transmission in the automotive transmission system. Existing transmissions generally use fixed-gear speed ratio monitoring. However, during the shifting process, as the clutch is opened and engaged, the speed ratio will also change dynamically accordingly. Therefore, using fixed-gear speed ratio monitoring based on experience is no longer applicable, and it is impossible to accurately monitor the shifting process, affecting the safe driving of the vehicle. Summary of the Invention

[0003] The main objective of the present invention is to propose a shifting monitoring method, a control device, and a transmission, aiming at the problem of inaccurate shifting monitoring of existing transmissions.

[0004] To achieve the above objective, the shifting monitoring method proposed by the present invention includes:

[0005] S10: When the vehicle is shifting, obtain the actual speed ratio of the transmission, and determine whether the shifting is over-limit according to the actual speed ratio;

[0006] S20: When it is determined that the shifting is over-limit, obtain the coupling state of the dog clutch in the transmission during shifting;

[0007] S30: Control the alarm device to output a fault prompt message according to the coupling state of the dog clutch.

[0008] In one embodiment, step S30 includes:

[0009] S31: When the dog clutch is in a disengaged state, control the alarm device to report a speed ratio fault without the participation of the dog clutch;

[0010] S32: When the dog clutch is in a coupled state, stop shifting and return to the initial gear to shift again, and at the same time perform an abnormal count. According to the abnormal count, control the alarm device to output a fault prompt message.

[0011] In one embodiment, step S30 includes:

[0012] S321: Within a preset time, return to execute steps S10 and S20 to determine the shifting, and according to the determination result, determine the cumulative abnormal count of the shifting;

[0013] S322: When the cumulative abnormal count is greater than a preset count threshold, control the alarm device to report a speed ratio fault with the participation of the dog clutch.

[0014] In one embodiment, determining the cumulative abnormal count of gear shifting according to the determination result includes:

[0015] S3211: When it is determined that the gear shifting is over-limit and the dog clutch is in the coupled state, the cumulative abnormal count is incremented by 1;

[0016] S3212: When it is determined that the gear shifting is not over-limit or the dog clutch is in the disengaged state, the cumulative abnormal count is decremented by 1.

[0017] In one embodiment, determining whether the gear shifting is over-limit according to the actual gear ratio includes:

[0018] When the actual gear ratio is greater than the first preset gear ratio threshold or less than the second preset gear ratio threshold, it is determined that the gear shifting is over-limit, where the first preset gear ratio threshold is greater than the second preset gear ratio threshold.

[0019] In one embodiment, before step S10, it includes:

[0020] S01: Obtain the initial gear and the target gear of the transmission, and determine the gear shifting type of the transmission according to the initial gear and the target gear;

[0021] S02: Determine the first preset gear ratio threshold and the second preset gear ratio threshold according to the gear shifting type.

[0022] In one embodiment, step S02 includes:

[0023] S02a: When the gear shifting type is determined to be upshifting, determine the upper limit of the gear ratio of the initial gear as the first preset gear ratio threshold, and determine the lower limit of the gear ratio of the target gear as the second preset gear ratio threshold;

[0024] S02b: When the gear shifting type is determined to be downshifting, determine the upper limit of the gear ratio of the target gear as the first preset gear ratio threshold, and determine the lower limit of the gear ratio of the initial gear as the second preset gear ratio threshold.

[0025] In one embodiment, after step S30, it includes:

[0026] S40: Abort the gear shifting and limit the torque increase.

[0027] In addition, the present invention further provides a control device, where the control device includes a memory, a processor, and a gear shifting monitoring program stored on the memory and executable on the processor, and the gear shifting monitoring program is configured to implement the steps of the above gear shifting monitoring method.

[0028] The present invention also provides a transmission, which includes a control device. The control device includes a memory, a processor, and a shift monitoring program stored on the memory and executable on the processor. The shift monitoring program is configured to implement the steps of the above-mentioned shift monitoring method.

[0029] In the technical solution of the present invention, by obtaining the actual gear ratio, it is determined whether the actual gear ratio of the transmission exceeds the limit during the shift process. When it is determined that the shift exceeds the limit, by obtaining the coupling state of the dog clutch, it is determined whether the dog clutch is involved in the shift process. And according to the participation of the dog clutch, it is determined that the alarm device outputs corresponding fault prompt information. In this way, through the actual gear ratio, the shift process is monitored to determine whether a fault occurs during the shift process, and through the coupling state of the dog clutch, it is determined whether the dog clutch is involved in the shift process, so that the alarm device can output corresponding fault prompt information, which is beneficial to accurately judge the fault condition of the transmission, and thus helps to accurately monitor the shift process of the transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0031] Figure 1 It is a schematic structural diagram of the control device of the transmission related to the solution of the embodiment of the present invention;

[0032] Figure 2 It is a first flowchart of the shift monitoring method provided by the present invention.

[0033] The realization of the object of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0035] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0037] In view of this, the present invention provides a shift monitoring method, aiming to solve the problem of inaccurate shift monitoring of existing transmissions. The transmission includes a control device. Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the control device of the transmission involved in the embodiment solution of the present invention.

[0038] As Figure 1 shown, the control device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to achieve connection communication between these components. The user interface 1003 may include a display screen (Display) and an input unit such as a keyboard (Keyboard). Optionally, the user interface 1003 may further include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM) or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0039] As Figure 1 shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a control program for the control device.

[0040] In Figure 1 the control device shown, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the control device of the present invention may be arranged in the control device, and the control device calls the control program of the control device stored in the memory 1005 through the processor 1001 and executes the control method of the control device provided by the embodiments of the present invention.

[0041] In Figure 1 the controller shown, the control program of the hybrid transmission stored in the memory 1005 is called through the processor 1001 and the following operations are performed:

[0042] S10: When the vehicle shifts gears, obtain the actual gear ratio of the transmission, and determine whether the gear shift is out of limit according to the actual gear ratio;

[0043] S20: When it is determined that the gear shift is out of limit, obtain the coupling state of the dog clutch in the transmission during the gear shift;

[0044] S30: Control the alarm device to output a fault prompt message according to the coupling state of the dog clutch.

[0045] Further, step S30 includes:

[0046] S31: When the dog clutch is in a disengaged state, control the alarm device to report a gear ratio fault without the participation of the dog clutch;

[0047] S32: When the dog clutch is in a coupled state, stop the gear shift and return to the initial gear to shift gears again, and at the same time perform an abnormal count, and control the alarm device to output a fault prompt message according to the abnormal count.

[0048] Further, step S30 includes:

[0049] S321: Within a preset time, return to execute steps S10 and S20 to determine the gear shift, and determine the cumulative abnormal count of the gear shift according to the determination result;

[0050] S322: When the cumulative abnormal count is greater than a preset count threshold, control the alarm device to report a gear ratio fault with the participation of the dog clutch.

[0051] Further, the determining the cumulative abnormal count of the gear shift according to the determination result includes:

[0052] S3211: When it is determined that the shift is out of limit and the dog clutch is in the coupled state, the cumulative abnormal count is incremented by 1;

[0053] S3212: When it is determined that the shift is not out of limit or the dog clutch is in the disengaged state, the cumulative abnormal count is decremented by 1.

[0054] Further, determining whether the shift is out of limit according to the actual speed ratio includes:

[0055] When the actual speed ratio is greater than the first preset speed ratio threshold or less than the second preset speed ratio threshold, it is determined that the shift is out of limit, where the first preset speed ratio threshold is greater than the second preset speed ratio threshold.

[0056] Further, before step S10, it includes:

[0057] S01: Obtain the initial gear and the target gear of the transmission, and determine the shift type of the transmission according to the initial gear and the target gear;

[0058] S02: Determine the first preset speed ratio threshold and the second preset speed ratio threshold according to the shift type.

[0059] Further, step S02 includes:

[0060] S02a: When the shift type is determined to be an upshift, set the upper limit of the speed ratio of the initial gear as the first preset speed ratio threshold, and set the lower limit of the speed ratio of the target gear as the second preset speed ratio threshold;

[0061] S02b: When the shift type is determined to be a downshift, set the upper limit of the speed ratio of the target gear as the first preset speed ratio threshold, and set the lower limit of the speed ratio of the initial gear as the second preset speed ratio threshold.

[0062] Further, after step S30, it includes:

[0063] Abort the shift and limit the torque increase

[0064] Based on the above hardware structure, the present invention proposes a shift monitoring method for a transmission. Please refer to Figure 2 , Figure 2 which is the first process schematic diagram of the shift monitoring method provided by the present invention.

[0065] The shift monitoring method includes:

[0066] S10: When the vehicle is shifting gears, obtain the actual speed ratio of the transmission, and determine whether the shift is out of limit according to the actual speed ratio;

[0067] It should be noted that in a transmission, the speed ratio refers to the ratio of the rotational speed of the input shaft to the rotational speed of the output shaft, that is, the value obtained by dividing the rotational speed of the input shaft by the rotational speed of the output shaft. Further, the actual speed ratio refers to the real-time rotational speed during the gear shifting process.

[0068] S20: When it is determined that the gear shifting limit is exceeded, obtain the coupling state of the dog clutch in the transmission during gear shifting;

[0069] S30: According to the coupling state of the dog clutch, control the alarm device to output a fault prompt message.

[0070] In the technical solution of the present invention, by obtaining the actual speed ratio, it is determined whether the actual speed ratio of the transmission exceeds the limit during the gear shifting process. When it is determined that the gear shifting limit is exceeded, by obtaining the coupling state of the dog clutch, it is determined whether the dog clutch is involved in the gear shifting process. According to the participation situation of the dog clutch, it is determined that the alarm device outputs a corresponding fault prompt message. In this way, through the actual speed ratio, the gear shifting process is monitored to determine whether a fault occurs during the gear shifting process, and through the coupling state of the dog clutch, it is determined whether the dog clutch is involved in the gear shifting process, so that the alarm device can output a corresponding fault prompt message, which is beneficial to accurately judge the fault situation of the transmission, thereby helping to accurately monitor the gear shifting process of the transmission.

[0071] Further, since during the gear shifting process, if the dog clutch is involved, even if the gear shifting limit is exceeded, it cannot be completely determined that there is a problem with the gear shifting process. Therefore, step S30 includes:

[0072] S31: When the dog clutch is in the disengaged state, control the alarm device to report a speed ratio fault without the participation of the dog clutch;

[0073] S32: When the dog clutch is in the coupled state, stop the gear shifting and return to the initial gear to shift gears again. At the same time, perform abnormal counting, and according to the abnormal counting, control the alarm device to output a fault prompt message.

[0074] In this embodiment, when the gear ratio exceeds the limit during the shift involving the dog clutch, the shift does not necessarily have a problem. Therefore, when it is determined that the shift limit is exceeded and the dog clutch is in the disengaged state, it indicates that the dog clutch is not involved in the shift process. At this time, it is determined that there is a problem in the shift process, so the alarm device reports a gear ratio fault without the participation of the dog clutch. When the dog clutch is in the coupled state, it indicates that the dog clutch is involved in the shift process. At this time, there may be a problem in the shift process. It is necessary to stop the shift and return to the initial gear to shift again, and at the same time, perform an abnormal count to determine whether there is a problem in the shift involving the dog clutch. When there is a problem in the shift, control the alarm device to output a fault prompt message. In this way, through the coupled state of the dog clutch, it is determined whether the dog clutch is involved in the shift process, and the shift is forced to abort, reducing the probability of damage to the transmission due to continued shifting. At the same time, the shift is restarted and an abnormal count is performed to determine the fault condition of the shift involving the dog clutch according to the abnormal count, and control the alarm device to output the corresponding fault prompt message, which helps to improve the accuracy of shift process monitoring.

[0075] Further, step S30 includes:

[0076] S321: Within a preset time, return to execute steps S10 and S20 to determine the shift and determine the cumulative abnormal count of the shift according to the determination result;

[0077] It should be noted that there are various preset times. Exemplarily, the preset time is 1 min, 2 min, or 5 min, etc., which can be specifically adjusted according to needs. The present invention does not limit this.

[0078] S322: When the cumulative abnormal count is greater than the preset count threshold, control the alarm device to report a gear ratio fault involving the dog clutch.

[0079] In this embodiment, within a preset time, steps S10 and S20 are executed repeatedly to determine the gear shift, so as to determine whether the speed ratio exceeds the limit during the gear shift involving the dog clutch, and according to the determination result, the cumulative abnormal count during the gear shift is determined. Further, when the cumulative abnormal count is greater than the preset count threshold, it indicates that there is a problem with the gear shift involving the dog clutch. At this time, the alarm is controlled to report the speed ratio fault involving the dog clutch. When the cumulative abnormal count is not greater than the preset count threshold, it indicates that there is no problem with the gear shift involving the dog clutch. At this time, the alarm device does not output a fault prompt message. In this way, by determining the gear shift, counting the abnormal conditions during the gear shift, and using the cumulative abnormal count to determine whether there is a problem with the gear shift involving the dog clutch, the speed ratio exceeding the limit caused by accidental factors can be effectively eliminated, which helps to improve the accuracy of the transmission speed ratio monitoring.

[0080] It should be noted that there are various preset count thresholds, which can be 3, or 4, or 5 or 6, etc. Specifically, it can be adjusted according to needs, and the present invention does not limit this. Specifically, taking the preset count threshold as 3 as an example, if the cumulative abnormal count of the transmission is greater than 3, it indicates that there is a problem with the gear shift. At this time, the alarm device is controlled to report the speed ratio fault involving the dog clutch; if the cumulative slip count of the transmission is less than or equal to 3, it indicates that there is no problem with the gear shift. At this time, the alarm device does not output a fault prompt message.

[0081] Further, determining the cumulative abnormal count of the gear shift according to the determination result includes:

[0082] S3211: When it is determined that the gear shift exceeds the limit and the dog clutch is in the coupled state, the cumulative abnormal count is incremented by 1;

[0083] S3212: When it is determined that the gear shift does not exceed the limit or the dog clutch is in the separated state, the cumulative abnormal count is decremented by 1.

[0084] In this embodiment, when it is determined that the gear shift exceeds the limit and the dog clutch is in the coupled state, the cumulative abnormal count is incremented by 1. When it is determined that the gear shift does not exceed the limit or the dog clutch is in the separated state, the cumulative abnormal count is decremented by 1 until the cumulative count is 0. In this way, by adding and subtracting the cumulative abnormal count of the gear shift, the abnormal conditions of the gear shift involving the dog clutch can be statistically analyzed, eliminating the interference of accidental factors, which helps to accurately judge the fault conditions during the gear shift.

[0085] In an embodiment of the present invention, determining whether the gear shift exceeds the limit according to the actual speed ratio includes:

[0086] When the actual speed ratio is greater than the first preset speed ratio threshold or less than the second preset speed ratio threshold, it is determined that the gear shift is over-limit, where the first preset speed ratio threshold is greater than the second preset speed ratio threshold.

[0087] In this embodiment, when the actual speed ratio is greater than the first preset speed ratio threshold, it indicates that the actual speed ratio is too large. At this time, it is determined that the actual speed ratio is over-limit. When the actual speed ratio is less than the second preset speed ratio threshold, it indicates that the actual speed ratio is too small. At this time, it is determined that the actual speed ratio is over-limit. When the actual speed ratio is less than or equal to the first preset speed ratio threshold and greater than or equal to the second preset speed ratio threshold, it indicates that the actual speed ratio is within a reasonable range. At this time, it is determined that the actual speed ratio is not over-limit. In this way, through the actual speed ratio, it is possible to determine whether the gear shift process is over-limit, which helps to judge whether there is a problem in the gear shift process.

[0088] It should be noted that the first preset speed ratio threshold and the second preset speed ratio threshold can be a fixed value or a value range, and the present invention does not limit this.

[0089] Further, before step S10, it includes:

[0090] S01: Obtain the initial gear and the target gear of the transmission, and determine the gear shift type of the transmission according to the initial gear and the target gear;

[0091] It should be noted that the initial gear is the gear before the gear shift, and the target gear is the gear after the gear shift. The gear shift type includes upshifting and downshifting. Further, when the target gear is greater than the initial gear, it is determined that the gear shift type is upshifting; when the target gear is less than the initial gear, it is determined that the gear shift type is downshifting.

[0092] S02: Determine the first preset speed ratio threshold and the second preset speed ratio threshold according to the gear shift type.

[0093] In this embodiment, since the speed ratio will change dynamically during the gear shift process, when the gear shift type changes, the first preset speed ratio threshold and the second preset speed ratio threshold need to be adjusted accordingly. For this reason, by obtaining the initial gear and the target gear, the gear shift type can be determined, and through the gear shift type, the first preset speed ratio threshold and the second preset speed ratio threshold can be determined, so that the first preset speed ratio threshold and the second preset speed ratio threshold can be adapted to the gear shift type, which helps to improve the accuracy of gear shift monitoring.

[0094] Further, step S02 includes:

[0095] S02a: When the shift type is determined to be an upshift, determine the upper limit of the gear ratio of the initial gear as the first preset gear ratio threshold, and determine the lower limit of the gear ratio of the target gear as the second preset gear ratio threshold;

[0096] S02b: When the shift type is determined to be a downshift, determine the upper limit of the gear ratio of the target gear as the first preset gear ratio threshold, and determine the lower limit of the gear ratio of the initial gear as the second preset gear ratio threshold.

[0097] In this embodiment, when the shift type is determined to be an upshift, it indicates that the gear ratio before shifting is large and the gear ratio after shifting is small. At this time, determine the upper limit of the gear ratio of the initial gear as the first preset gear ratio threshold, and determine the lower limit of the gear ratio of the target gear as the second preset gear ratio threshold, so that the first preset gear ratio threshold is the maximum value between the initial gear and the target gear, and the second preset gear ratio threshold is the minimum value between the initial gear and the target gear. When the shift type is determined to be a downshift, it indicates that the gear ratio before shifting is small and the gear ratio after shifting is large. At this time, determine the upper limit of the gear ratio of the target gear as the first preset gear ratio threshold, and determine the lower limit of the gear ratio of the initial gear as the second preset gear ratio threshold, so that the first preset gear ratio threshold is the maximum value between the initial gear and the target gear, and the second preset gear ratio threshold is the minimum value between the initial gear and the target gear. In this way, according to the shift type, adjust the first preset gear ratio threshold and the second preset gear ratio threshold, so that the first preset gear ratio threshold is the maximum value between the initial gear and the target gear, and the second preset gear ratio threshold is the minimum value between the initial gear and the target gear, so as to prevent the first preset gear ratio threshold and the second preset gear ratio threshold from being too large or too small.

[0098] In one embodiment of the present invention, after step S30, it includes:

[0099] S40: Abort the shift and limit the torque increase.

[0100] In this embodiment, when the alarm device outputs a fault prompt message, it indicates that a fault occurs in the transmission during the shifting process. At this time, if the shift continues, it may cause damage to the transmission. Therefore, abort the shift and limit the torque increase to reduce the risk of damage to the transmission.

[0101] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A shift monitoring method, characterized in that, The described shift monitoring method includes: S10: When the vehicle is shifting gears, obtain the actual gear ratio of the transmission, and determine whether the gear shift is over-limit according to the actual gear ratio; S20: When it is determined that the gear shift is over-limit, obtain the coupling state of the dog clutch in the transmission during the gear shift; S30: According to the coupling state of the dog clutch, control the alarm device to output a fault prompt message.

2. The shift monitoring method according to claim 1, characterized in that Step S30 includes: S31: When the dog clutch is in the disengaged state, control the alarm device to report a gear ratio fault without the participation of the dog clutch; S32: When the dog clutch is in the coupled state, stop the gear shift and return to the initial gear to shift gears again, while performing an abnormal count, and control the alarm device to output a fault prompt message according to the abnormal count.

3. The shift monitoring method according to claim 2, wherein Step S30 includes: S321: Within a preset time, return to execute steps S10 and S20 to determine the gear shift, and determine the cumulative abnormal count of the gear shift according to the determination result; S322: When the cumulative abnormal count is greater than a preset count threshold, control the alarm device to report a gear ratio fault with the participation of the dog clutch.

4. The shift monitoring method according to claim 3, characterized in that, The determining the cumulative abnormal count of the gear shift according to the determination result includes: S3211: When it is determined that the gear shift is over-limit and the dog clutch is in the coupled state, the cumulative abnormal count is incremented by 1; S3212: When it is determined that the gear shift is not over-limit or the dog clutch is in the disengaged state, the cumulative abnormal count is decremented by 1.

5. The shift monitoring method according to claim 1, characterized in that The determining whether the gear shift is over-limit according to the actual gear ratio includes: When the actual gear ratio is greater than a first preset gear ratio threshold or less than a second preset gear ratio threshold, it is determined that the gear shift is over-limit, where the first preset gear ratio threshold is greater than the second preset gear ratio threshold.

6. The shift monitoring method according to claim 5, characterized in that, Before step S10, it includes: S01: Obtain the initial gear and the target gear of the transmission, and determine the gear shift type of the transmission according to the initial gear and the target gear; S02: Determine the first preset gear ratio threshold and the second preset gear ratio threshold according to the gear shift type.

7. The shift monitoring method according to claim 6, characterized in that, Step S02 includes: S02a: When the gear shift type is determined to be an upshift, set the upper limit of the gear ratio of the initial gear as the first preset gear ratio threshold, and set the lower limit of the gear ratio of the target gear as the second preset gear ratio threshold; S02b: When the gear shift type is determined to be a downshift, set the upper limit of the gear ratio of the target gear as the first preset gear ratio threshold, and set the lower limit of the gear ratio of the initial gear as the second preset gear ratio threshold.

8. The shift monitoring method according to claim 1, characterized in that After step S30, it includes: S40: Abort the gear shift and limit the torque increase.

9. A control device, characterized in that, The control device includes a memory, a processor, and a shift monitoring program stored on the memory and executable on the processor. The shift monitoring program is configured to implement the steps of the shift monitoring method according to any one of claims 1 to 8.

10. A transmission, characterized in that, Including the control device according to claim 9.

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