Method for determining power transmission direction and related device

Abstract

The invention discloses a method for determining a power transmission direction and a related device. A clutch combination included in a first standard clutch combination is a combination of clutches combined with a planet row under each gear in the normal driving process; detecting the combination state of each clutch and the planet row based on the current to obtain a current clutch combination; if the current clutch combination is consistent with the first standard clutch combination and the gear corresponding to the current clutch combination is a forward gear, the power transmission direction is forward; if the current clutch combination is consistent with the first standard clutch combination and the gear corresponding to the current clutch combination is a reverse gear, the power transmission direction is backward; and if the current clutch combination is not consistent with the first standard clutch combination, the power transmission direction is disengaged. Thus, even if there is no clutch position sensor or clutch fluid force sensor, the clutch combined with the planet row is determined based on the current, and the power transmission direction is determined by comparing with the first standard clutch combination.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a method for determining a power transmission direction and a related device. Background Art

[0002] For the power control system, preventing the vehicle from having a power transmission direction that is inconsistent with the driver's intention is one of the important safety goals. If the power transmission direction of the automatic transmission does not match the driver's intention, for example, the driver wants the vehicle to move forward, but the power transmission direction is backward, the vehicle will actually move backward. Especially when the power transmission direction does not match the driver's intention when the vehicle starts, it is likely to cause a safety accident. Therefore, it is necessary to identify the power transmission direction of the automatic transmission to prevent the power transmission direction from being inconsistent with the driver's needs.

[0003] In the related art, each clutch has a clutch position sensor or clutch hydraulic sensor to determine the engagement status of the clutch and the planetary gear, and then determine the direction of power transmission. However, due to layout space and cost considerations, not every clutch in an automatic transmission equipped with a planetary gear is equipped with a clutch position sensor or clutch hydraulic sensor, so the direction of power transmission cannot be directly determined by the clutch position sensor or clutch hydraulic sensor. Summary of the invention

[0004] In response to the above problems, the present application provides a method for determining the power transmission direction and a related device, which are used to determine the power transmission direction in the absence of a clutch position sensor or a clutch hydraulic sensor.

[0005] Based on this, the embodiments of the present application disclose the following technical solutions:

[0006] On the one hand, an embodiment of the present application provides a method for determining a power transmission direction, the method comprising:

[0007] Acquire a first standard clutch combination, wherein the first standard clutch combination includes a clutch combination that is a combination of clutches combined with a planetary gear in each gear position during normal driving;

[0008] Detecting the engagement state of each clutch and the planetary gear set based on the current to obtain the current clutch combination;

[0009] If the current clutch combination is consistent with the first standard clutch combination, and the gear corresponding to the current clutch combination is the forward gear, the power transmission direction is forward;

[0010] If the current clutch combination is consistent with the first standard clutch combination, and the gear corresponding to the current clutch combination is the reverse gear, the power transmission direction is backward;

[0011] If the current clutch combination is inconsistent with the first standard clutch combination, the power transmission direction is disengagement.

[0012] Optionally, the method further includes:

[0013] Acquire a second standard clutch combination and a third standard clutch combination, wherein the second standard clutch combination includes a clutch combination corresponding to the planetary gear set being in a locked state, and the third standard clutch combination includes a clutch combination that is replaced during a gear shifting process;

[0014] If the current clutch combination is consistent with the second standard clutch combination, the power transmission direction is blocked; or,

[0015] If the number of clutches included in the current clutch combination is greater than the maximum number of shift combinations, the power transmission direction is blocked, and the maximum number of shift combinations is the value with the largest number of clutches among the clutch combinations included in the third standard clutch combination; or,

[0016] If the current clutch combination is consistent with the third standard clutch combination, and the current values ​​of the two interactive clutches are greater than the preset current threshold, the power transmission direction is blocked, and the interactive clutch is a clutch that is replaced during the gear shifting process.

[0017] Optionally, the method further includes:

[0018] Acquire a third standard clutch combination, wherein the third standard clutch combination includes a clutch combination that is replaced during a gear shift process;

[0019] If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are both forward gears, and the current value of one interactive clutch is less than the preset current threshold, then the power transmission direction is potential forward, and the interactive clutch is a clutch that is replaced during the gear shifting process; or,

[0020] If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are the forward gear and the reverse gear, respectively, and the current value of the clutch forming the reverse gear is less than the preset current threshold, and the current value of the clutch forming the forward gear is greater than or equal to the preset current threshold, then the power transmission direction is potential forward;

[0021] If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are the forward gear and the reverse gear, and the current value of the clutch forming the reverse gear is greater than or equal to the preset current threshold, and the current value of the clutch forming the forward gear is less than the preset current threshold, then the power transmission direction is potentially backward;

[0022] If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are the forward gear and the reverse gear, and the current value of the clutch that forms the reverse gear is less than the preset current threshold, and the current value of the clutch that forms the forward gear is less than the preset current threshold, then the power transmission direction is a potential situation.

[0023] Optionally, the method further includes:

[0024] Acquiring a handle signal, wherein the handle signal is used to indicate the driver's intention;

[0025] If it is determined based on the handle signal that the handle is in the forward gear and the conditions included in the first condition set are met at the same time, the third time period starts to increase, otherwise the third time period starts to decrease;

[0026] If the third time period is greater than a third time threshold, the power transmission direction is inconsistent with the driver's intention;

[0027] Among them, the first condition set includes a first condition, a second condition, a third condition and a fourth condition, the first condition is that the current clutch combination is not a clutch combination combined with a reverse gear, the second condition is that the power transmission direction is backward, potentially backward or a potential situation, the third condition is that based on the handle signal, it is determined that the exit time of the handle exiting the forward gear or the reverse gear is greater than a fourth time threshold, the fourth condition is that the engine torque is greater than the second torque threshold, or based on the handle signal, it is determined that the change time of the handle from the reverse gear to the forward gear is greater than a fifth time threshold.

[0028] Optionally, the method further includes:

[0029] If it is determined based on the handle signal that the handle is in the forward gear, and the current clutch combination is a clutch combination for the reverse gear, the first time period starts to increase, otherwise the first time period starts to decrease;

[0030] If it is determined based on the handle signal that the handle is in the forward gear, and the current clutch combination is a clutch combination for the reverse gear, and the engine torque is greater than the first torque threshold, the second time period starts to increase, otherwise the second time period starts to decrease;

[0031] If the first time period is greater than a first time threshold, or the second time period is greater than a second time threshold, then the power transmission direction is inconsistent with the driver's intention.

[0032] Optionally, the method further includes:

[0033] Acquiring a handle signal, wherein the handle signal is used to indicate the driver's intention;

[0034] If it is determined based on the handle signal that the handle is in reverse gear and the conditions included in the second condition set are met at the same time, the sixth time period starts to increase, otherwise the sixth time period starts to decrease;

[0035] If the sixth time period is greater than a sixth time threshold, the power transmission direction is inconsistent with the driver's intention;

[0036] Among them, the second condition set includes the fifth condition and the third condition, the fifth condition is that the power transmission direction is forward, potential forward or potential, and the third condition is that based on the handle signal, it is determined that the exit time of the handle exiting the forward gear or the reverse gear is greater than a fourth time threshold.

[0037] Optionally, the method further includes:

[0038] If the power transmission direction does not match the driver's intention, the transmission chain is disengaged to interrupt power transmission.

[0039] On the other hand, the present application provides a device for determining a power transmission direction, the device comprising: an acquisition unit, a detection unit, and a judgment unit;

[0040] The acquisition unit is used to acquire a first standard clutch combination, wherein the first standard clutch combination includes a clutch combination that is a combination of clutches combined with the planetary gear in each gear position during normal driving;

[0041] The detection unit is used to detect the engagement state of each clutch and the planetary gear based on the current to obtain the current clutch combination;

[0042] The judgment unit is used for determining that if the current clutch combination is consistent with the first standard clutch combination and the gear position corresponding to the current clutch combination is a forward gear, the power transmission direction is forward;

[0043] The judgment unit is further configured to determine that if the current clutch combination is consistent with the first standard clutch combination and the gear corresponding to the current clutch combination is a reverse gear, then the power transmission direction is backward;

[0044] The judgment unit is further configured to determine that if the current clutch combination is inconsistent with the first standard clutch combination, the power transmission direction is disengagement.

[0045] Optionally, the acquisition unit is further used to:

[0046] Acquire a second standard clutch combination and a third standard clutch combination, wherein the second standard clutch combination includes a clutch combination corresponding to the planetary gear set being in a locked state, and the third standard clutch combination includes a clutch combination that is replaced during a gear shifting process;

[0047] The judging unit is further configured to:

[0048] If the current clutch combination is consistent with the second standard clutch combination, the power transmission direction is blocked; or,

[0049] If the number of clutches included in the current clutch combination is greater than the maximum number of shift combinations, the power transmission direction is blocked, and the maximum number of shift combinations is the value with the largest number of clutches among the clutch combinations included in the third standard clutch combination; or,

[0050] If the current clutch combination is consistent with the third standard clutch combination, and the current values ​​of the two interactive clutches are greater than the preset current threshold, the power transmission direction is blocked, and the interactive clutch is a clutch that is replaced during the gear shifting process.

[0051] Optionally, the acquisition unit is further used to:

[0052] Acquire a third standard clutch combination, wherein the third standard clutch combination includes a clutch combination that is replaced during a gear shift process;

[0053] The judging unit is further configured to:

[0054] If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are both forward gears, and the current value of one interactive clutch is less than the preset current threshold, then the power transmission direction is potential forward, and the interactive clutch is a clutch that is replaced during the gear shifting process; or,

[0055] If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are the forward gear and the reverse gear, respectively, and the current value of the clutch forming the reverse gear is less than the preset current threshold, and the current value of the clutch forming the forward gear is greater than or equal to the preset current threshold, then the power transmission direction is potential forward;

[0056] If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are the forward gear and the reverse gear, and the current value of the clutch forming the reverse gear is greater than or equal to the preset current threshold, and the current value of the clutch forming the forward gear is less than the preset current threshold, then the power transmission direction is potentially backward;

[0057] If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are the forward gear and the reverse gear, and the current value of the clutch that forms the reverse gear is less than the preset current threshold, and the current value of the clutch that forms the forward gear is less than the preset current threshold, then the power transmission direction is a potential situation.

[0058] Optionally, the acquisition unit is further used to:

[0059] Acquiring a handle signal, wherein the handle signal is used to indicate the driver's intention;

[0060] The judging unit is further configured to:

[0061] If it is determined based on the handle signal that the handle is in the forward gear and the conditions included in the first condition set are met at the same time, the third time period starts to increase, otherwise the third time period starts to decrease;

[0062] If the third time period is greater than a third time threshold, the power transmission direction is inconsistent with the driver's intention;

[0063] Among them, the first condition set includes a first condition, a second condition, a third condition and a fourth condition, the first condition is that the current clutch combination is not a clutch combination combined with a reverse gear, the second condition is that the power transmission direction is backward, potentially backward or a potential situation, the third condition is that based on the handle signal, it is determined that the exit time of the handle exiting the forward gear or the reverse gear is greater than a fourth time threshold, the fourth condition is that the engine torque is greater than the second torque threshold, or based on the handle signal, it is determined that the change time of the handle from the reverse gear to the forward gear is greater than a fifth time threshold.

[0064] Optionally, the judging unit is further configured to:

[0065] If it is determined based on the handle signal that the handle is in the forward gear, and the current clutch combination is a clutch combination for the reverse gear, the first time period starts to increase, otherwise the first time period starts to decrease;

[0066] If it is determined based on the handle signal that the handle is in the forward gear, and the current clutch combination is a clutch combination for the reverse gear, and the engine torque is greater than the first torque threshold, the second time period starts to increase, otherwise the second time period starts to decrease;

[0067] If the first time period is greater than a first time threshold, or the second time period is greater than a second time threshold, then the power transmission direction is inconsistent with the driver's intention.

[0068] Optionally, the acquisition unit is further used to:

[0069] Acquiring a handle signal, wherein the handle signal is used to indicate the driver's intention;

[0070] The judging unit is further configured to:

[0071] If it is determined based on the handle signal that the handle is in reverse gear and the conditions included in the second condition set are met at the same time, the sixth time period starts to increase, otherwise the sixth time period starts to decrease;

[0072] If the sixth time period is greater than a sixth time threshold, the power transmission direction is inconsistent with the driver's intention;

[0073] Among them, the second condition set includes the fifth condition and the third condition, the fifth condition is that the power transmission direction is forward, potential forward or potential, and the third condition is that based on the handle signal, it is determined that the exit time of the handle exiting the forward gear or the reverse gear is greater than a fourth time threshold.

[0074] Optionally, the device further comprises an execution unit for controlling the disengagement of the transmission chain to interrupt the power transmission if the power transmission direction is inconsistent with the driver's intention.

[0075] In another aspect, the present application provides a computer device, the device comprising a processor and a memory:

[0076] The memory is used to store program code and transmit the program code to the processor;

[0077] The processor is used to execute the method described in the above aspects according to the instructions in the program code.

[0078] On the other hand, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store a computer program, and the computer program is used to execute the method described in the above aspects.

[0079] On the other hand, an embodiment of the present application provides a computer program product or a computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the method described in the above aspects.

[0080] The advantages of the above technical solution of this application are:

[0081] The first standard clutch combination is obtained. The clutch combination included in the first standard clutch combination is a combination of clutches combined with the planetary gear in each gear during normal driving. Since there is no clutch position sensor or clutch hydraulic sensor, it is necessary to detect the combination state of each clutch and the planetary gear based on the current to obtain the current clutch combination, that is, which clutches are currently combined with the planetary gear. If the current clutch combination is consistent with the first standard clutch combination, and the gear corresponding to the current clutch combination is the forward gear, it means that the current clutch combination is consistent with the clutch combination corresponding to the forward gear, and the power transmission direction is forward at this time; if the current clutch combination is consistent with the first standard clutch combination, and the gear corresponding to the current clutch combination is the reverse gear, it means that the current clutch combination is consistent with the clutch combination corresponding to the reverse gear, and the power transmission direction is backward at this time; if the current clutch combination is inconsistent with the first standard clutch combination, it means that the current clutch combination is not the clutch combination corresponding to the gear required during normal driving, and the power transmission direction is disengaged at this time, that is, there is no power transmission. Therefore, even if there is no clutch position sensor or clutch hydraulic sensor, the clutch combined with the planetary gear can be determined based on the current, and then compared with the first standard clutch combination to determine the power transmission direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0083] Figure 1 A flow chart of a method for determining a power transmission direction provided in this application;

[0084] Figure 2 A schematic diagram of a device for determining a power transmission direction provided in the present application;

[0085] Figure 3 A structural diagram of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0086] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0087] Combine the following Figure 1 , a method for determining the power transmission direction provided in an embodiment of the present application is introduced. Figure 1 The method shown, in one implementation, may be executed by, for example, an electronic control unit (ECU) included in a vehicle. Figure 1 , this figure is a flow chart of a method for determining the power transmission direction provided in an embodiment of the present application, and the method may include S101-S105.

[0088] S101: Obtain a first standard clutch combination.

[0089] The first standard clutch combination includes a clutch combination that is a combination of clutches that are combined with the planetary gear in each gear during normal driving. For example, a vehicle has 6 clutches. When the vehicle is in reverse gear, clutch 1, clutch 2, and clutch 3 are all combined with the planetary gear. At this time, the clutch combination corresponding to the reverse gear is clutch 1, clutch 2, and clutch 3.

[0090] It should be noted that the first standard clutch combination includes a plurality of clutch combinations, which can be obtained based on bench characteristic test experiments, so as to obtain the clutch combinations corresponding to each gear position and obtain the first standard clutch combination.

[0091] S102: Detect the engagement state of each clutch and planetary gear based on the current to obtain the current clutch combination.

[0092] Since there is no clutch position sensor or clutch hydraulic sensor, it is necessary to detect the combination state of each clutch and planetary gear based on the current to obtain the current clutch combination, that is, which clutches are currently combined with the planetary gear.

[0093] As a possible implementation method, the clutch torque corresponding to the current of each clutch can be obtained, which can be obtained based on the corresponding relationship between the clutch current and the clutch torque, and the corresponding relationship can also be obtained based on the bench characteristic test experiment. The clutch whose clutch torque is greater than the preset torque threshold and whose duration is greater than the preset time threshold is determined to be the clutch combined with the planetary gear, that is, to ensure that the clutch is stably combined with the planetary gear, and then the current clutch combination is obtained according to the clutch combined with the planetary gear.

[0094] S103: If the current clutch combination is consistent with the first standard clutch combination, and the gear corresponding to the current clutch combination is the forward gear, the power transmission direction is forward.

[0095] S104: If the current clutch combination is consistent with the first standard clutch combination, and the gear corresponding to the current clutch combination is the reverse gear, the power transmission direction is backward.

[0096] S105: If the current clutch combination is inconsistent with the first standard clutch combination, the power transmission direction is disengagement.

[0097] It should be noted that there are three directions of power transmission, namely forward, backward and free, free being a situation where there is no power transmission. The following is an explanation of the determination methods of the three directions of power transmission.

[0098] (1) Forward: If the current clutch combination is consistent with the first standard clutch combination, and the gear corresponding to the current clutch combination is the forward gear, it means that the current clutch combination is consistent with the clutch combination corresponding to the forward gear. At this time, the power transmission direction is forward, corresponding to the aforementioned S103.

[0099] (2) Backward: If the current clutch combination is consistent with the first standard clutch combination, and the gear corresponding to the current clutch combination is the reverse gear, it means that the current clutch combination is consistent with the clutch combination corresponding to the reverse gear. At this time, the power transmission direction is backward, corresponding to the aforementioned S104.

[0100] (3) Disengagement: If the current clutch combination is inconsistent with the first standard clutch combination, it means that the current clutch combination is not the clutch combination corresponding to the gear required during normal driving. At this time, the power transmission direction is disengagement, that is, there is no power transmission, corresponding to the aforementioned S105.

[0101] It can be seen from the above technical solution that the first standard clutch combination is obtained, and the clutch combination included in the first standard clutch combination is a combination of clutches combined with the planetary gear in each gear during normal driving. Since there is no clutch position sensor or clutch hydraulic sensor, it is necessary to detect the combination state of each clutch and the planetary gear based on the current to obtain the current clutch combination, that is, which clutches are currently combined with the planetary gear. If the current clutch combination is consistent with the first standard clutch combination, and the gear corresponding to the current clutch combination is the forward gear, it means that the current clutch combination is consistent with the clutch combination corresponding to the forward gear, and the power transmission direction is forward at this time; if the current clutch combination is consistent with the first standard clutch combination, and the gear corresponding to the current clutch combination is the reverse gear, it means that the current clutch combination is consistent with the clutch combination corresponding to the reverse gear, and the power transmission direction is backward at this time; if the current clutch combination is inconsistent with the first standard clutch combination, it means that the current clutch combination is not the clutch combination corresponding to the gear required during normal driving, and the power transmission direction is disengaged at this time, that is, there is no power transmission. Therefore, even if there is no clutch position sensor or clutch hydraulic sensor, the clutch combined with the planetary gear can be determined based on the current, and then compared with the first standard clutch combination to determine the power transmission direction.

[0102] It should be noted that in order to improve the accuracy of the power transmission direction, the types of power transmission directions can be further subdivided. In addition to (1) forward, (2) backward and (3) escape, it can also be one or more combinations of (4) blocked, (5) potential forward, (6) potential backward and (7) potential situations, which are explained below.

[0103] Blockage means that during the power transmission process, the power is blocked and the power is not correctly transmitted to the output end of the planetary gear, so that the gear cannot be formed. This clutch combination may have too many constraints, which will cause the planetary gear to be locked, and there will be no safety risk of low-speed starting caused by the power transmission direction not matching the driver's intention. In order to prevent false alarms, it is necessary to predetermine the clutch combination that may cause blocking and obtain the second standard clutch combination.

[0104] During the gear shifting process, the direction of power transmission will change, such as shifting from reverse gear to forward gear 2. In order to quickly identify the direction of power transmission, although it is currently in reverse gear and has not yet shifted to forward gear 2, it can be identified that the current power transmission direction is changing from backward to forward, and there is a forward trend. At this time, the power transmission direction can be defined as potential forward. Similarly, potential backward can also be defined.

[0105] In addition, there is a situation where, during the gear shifting process, the gear is removed and then re-engaged, or the vehicle has a malfunction, making it impossible to determine whether the current direction is potential forward or potential backward. At this time, the power transmission direction can be defined as a potential situation.

[0106] Therefore, the potential forward, potential backward and potential situations all occur during the gear shifting process, so based on the changes between the previous clutch combination (the clutch combination before the gear shifting) and the subsequent clutch combination (the clutch combination after the gear shifting), the third standard clutch combination can be obtained, that is, the clutch combination that changes during the gear shifting process, such as shifting from a combination of clutch No. 1, clutch No. 2 and clutch No. 3 to a combination of clutch No. 1, clutch No. 2 and clutch No. 4, then the combination of clutch No. 1, clutch No. 2, clutch No. 3 and clutch No. 4 can belong to the third standard clutch combination.

[0107] As a possible implementation, for one of the multiple planetary gears included in the automatic transmission, the speed of the other components can be deduced by determining the speed of two components of the planetary gear. Therefore, for the multiple planetary gears included in the automatic transmission, the gear positions corresponding to the two normally-engaged clutch combinations can be obtained according to the components of each clutch connecting the planetary gear. Among them, assuming that the shifting process needs to change from clutch No. 1, clutch No. 2 and clutch No. 3 being combined with the planetary gear to clutch No. 1, clutch No. 2 and clutch No. 4 being combined with the planetary gear, then clutch No. 1 and clutch No. 2 are normally-engaged clutches, and clutch No. 3 and clutch No. 4 are clutches that are replaced during the shifting process. It can be calculated and checked by permutation and combination to see whether there are any missing clutch combinations in the first standard clutch combination, the second standard clutch combination or the third standard clutch combination, thereby improving the accuracy of detection.

[0108] For example, if there are 6 clutches in total and 3 clutches are needed to complete the gear, then A clutch combination that does not meet the first standard clutch combination must be in the second standard clutch combination, and A clutch combination that does not meet the third standard clutch combination must be in the second standard clutch combination.

[0109] Based on this, after obtaining the second standard clutch combination and the third standard clutch combination, (4) blocking, (5) potential forward, (6) potential backward and (7) potential situations can be identified based on the second standard clutch combination and the third standard clutch combination, which are explained below respectively.

[0110] (4) Blocking: It is divided into three situations, which are explained below.

[0111] Case 1: If the current clutch combination is consistent with the second standard clutch combination, it means that the current clutch combination is one of the clutch combinations corresponding to the locked state of the planetary gear, and the power transmission direction is blocked at this time.

[0112] Case 2: If the number of clutches included in the current clutch combination is greater than the maximum number of shift combinations, the power transmission direction is blocked.

[0113] The number of clutches included in each of the multiple clutch combinations of the third standard clutch combination may be different, such as some clutch combinations include 3 clutches, some clutch combinations include 4 clutches, etc. The maximum number of shift combinations refers to the maximum number of clutches included in the clutch combination in the third standard clutch combination. If the number of clutches included in the current clutch combination is greater than the maximum number of shift combinations, it means that the current clutch combination may have too many constraints, and the power transmission direction is blocked at this time.

[0114] Case 3: If the current clutch combination is consistent with the third standard clutch combination, and the current values ​​of the two interactive clutches are both greater than the preset current threshold, the power transmission direction is blocked.

[0115] Continuing with the above example, if the gear is shifted from the combination of clutch No. 1, clutch No. 2 and clutch No. 3 to the combination of clutch No. 1, clutch No. 2 and clutch No. 4, then the combination of clutch No. 1, clutch No. 2, clutch No. 3 and clutch No. 4 can belong to the third standard clutch combination, among which clutch No. 3 and clutch No. 4 are interactive clutches, i.e., clutches that change during the gear shifting process, and clutch No. 1 and clutch No. 2 are normally engaged clutches, i.e., clutches that do not change during the gear shifting process.

[0116] If the current clutch combination is consistent with the third standard clutch combination, it means that the current is in the process of shifting. In theory, one of the two interactive clutches should be disconnected from the planetary gear (withdrawn), and the other interactive clutch should be connected to the planetary gear (engaged). Then the current value of the withdrawn interactive clutch should be less than the preset current threshold, and the current value of the engaged interactive clutch should be greater than the preset current threshold.

[0117] The preset current value can be determined based on the degree of engagement between the clutch and the planetary gear, such as the preset current value can be less than or equal to the current value corresponding to the complete engagement of the clutch and the planetary gear, and the preset current value can be greater than the current value corresponding to the moment when the clutch and the planetary gear begin to engage. The preset current threshold is related to the engine torque and can be obtained based on the engine torque table.

[0118] If the current clutch combination is consistent with the third standard clutch combination, and the current values ​​of the two interactive clutches are greater than the preset current threshold, it means that there is a problem at present, and the power transmission direction is blocked.

[0119] (5) Potential forward: There are two situations, which are explained below.

[0120] Case 1: If the current clutch combination is consistent with the third standard clutch combination, it means that it is currently in the gear shifting process, and if the two gears corresponding to the current clutch combination are both forward gears (such as forward gear 1 to forward gear 2), and the current value of one interactive clutch is less than the preset current threshold, it means that one interactive clutch is withdrawing and the other interactive clutch may be engaging. At this time, the power transmission direction is potentially forward.

[0121] Case 2: If the current clutch combination is consistent with the third standard clutch combination, it means that it is currently in the process of shifting gears, and if the two gears corresponding to the current clutch combination are forward gear and reverse gear respectively (such as shifting from forward gear 1 to reverse gear), and the current value of the clutch that forms the reverse gear is less than the preset current threshold, and the current value of the clutch that forms the forward gear is greater than or equal to the preset current threshold, then it means that the interactive clutch that forms the reverse gear is withdrawing, and the interactive clutch that forms the forward gear is engaging, that is, it is now shifting from reverse gear to forward gear, and the corresponding power transmission direction is potentially forward.

[0122] (6) Potential backward

[0123] If the current clutch combination is consistent with the third standard clutch combination, it means that it is currently in the gear shifting process, and if the two gears corresponding to the current clutch combination are forward gear and reverse gear respectively (such as shifting from forward gear 1 to reverse gear), and the current value of the clutch that forms the reverse gear is greater than or equal to the preset current threshold, and the current value of the clutch that forms the forward gear is less than the preset current threshold, then it means that the interactive clutch that forms the reverse gear is engaging, and the interactive clutch that forms the forward gear is withdrawing, that is, it is now shifting from forward gear to reverse gear, and the corresponding power transmission direction is potentially backward.

[0124] (7) Potential situations

[0125] If the current clutch combination is consistent with the third standard clutch combination, it means that it is currently in the process of shifting gears, and if the two gears corresponding to the current clutch combination are forward gear and reverse gear respectively (such as shifting from forward gear 1 to reverse gear), and the current value of the clutch that forms the reverse gear is less than the preset current threshold, and the current value of the clutch that forms the forward gear is less than the preset current threshold, it means that the gear may be removed first and then re-engaged, or the vehicle may have a fault, making it impossible to determine whether the current direction is potential forward or potential backward. At this time, the power transmission direction can be defined as a potential situation.

[0126] It should be noted that, in addition to satisfying the above seven power transmission directions, the default power transmission state is empty.

[0127] As a possible implementation, after determining the power transmission direction, it is possible to determine whether the current power transmission direction is consistent with the driver's intention, so as to ensure the safety of the vehicle. Among them, a handle signal can be obtained, and the handle signal is used to indicate the driver's intention. The following is an explanation of the two cases where the driver's intention is forward and backward.

[0128] 1) The driver intends to move forward: the handle is determined to be in the forward gear based on the handle signal.

[0129] In order to avoid some misjudgments, the embodiment of the present application performs cumulative timing on the three situations to ensure that each situation is actually triggered.

[0130] Case 1: If it is determined based on the handle signal that the handle is in the forward gear, and the current clutch combination is a clutch combination for the reverse gear, the first time period starts to increase, otherwise the first time period starts to decrease.

[0131] It is understandable that if the driving intention is to move forward, the forward gear is engaged based on the handle, but the gear corresponding to the actual clutch combination of the vehicle is the reverse gear, then it does not meet the driver's intention. For example, if the gear corresponding to the current clutch combination is a clutch combination for normal control combined with reverse gear (including auxiliary control clutch), then the first time period starts to increase, such as increasing the timing of Timer1, otherwise the first time period starts to decrease, such as reducing the timing of Timer1. Among them, combined reverse gear means changing from any gear to reverse gear.

[0132] For example, if the clutch used for reverse gear is a dog clutch, the speed difference needs to be reduced to 0 before the dog clutch is engaged. In this process, an auxiliary clutch is used to reduce the speed difference. For example, the clutch combination corresponding to reverse gear is clutch 2, clutch 4, and clutch 6. The clutch combination corresponding to forward gear 1 is clutch 1, clutch 4, and clutch 6. Since clutch 1 is a dog clutch, if you want to engage reverse gear, you need to engage clutch 3 to reduce its speed difference to 0 before engaging clutch 2. Therefore, clutch 3 is an auxiliary clutch, and the clutch combination used for reverse gear is clutch 2, clutch 3, clutch 4, and clutch 6.

[0133] Case 2: If the handle is determined to be in the forward gear based on the handle signal, and the current clutch combination is a clutch combination for the reverse gear, and the engine torque is greater than the first torque threshold, the second time period starts to increase, otherwise the second time period starts to decrease.

[0134] For example, the gear corresponding to the current clutch combination is a clutch combination for normal control combined with reverse gear (including an auxiliary control clutch), and torque has appeared, that is, the current power has begun to be transmitted, then the second time period starts to increase, such as increasing the timing of Timer2, otherwise the second time period starts to decrease, such as reducing the timing of Timer2.

[0135] Case three: if it is determined based on the handle signal that the handle is in the forward gear and the first condition set is satisfied at the same time, the third time period starts to increase, otherwise the third time period starts to decrease.

[0136] Among them, the first condition set includes a first condition, a second condition, a third condition and a fourth condition, which are described below respectively.

[0137] The first condition is that the current clutch combination is not a clutch combination for reverse gear, or in other words, the current clutch combination is not a clutch combination for reverse gear under normal control (including auxiliary control clutch), that is, the situation corresponding to situation one is removed to avoid false alarms.

[0138] The second condition is that the power transmission direction is backward, potentially backward or in a potential situation. It can be understood that if the current driver's intention is forward, then the power transmission direction is backward, potentially backward or in a potential situation which is opposite to the driver's intention.

[0139] The third condition is that the exit time of the handle to exit the forward gear or the reverse gear is greater than the fourth time threshold value based on the handle signal. It should be noted that, under normal circumstances, the exit time required for the handle to exit the forward gear or the reverse gear should be less than the fourth time threshold value. If it is not less than, it means that there is a problem at present.

[0140] The fourth condition is that the engine torque is greater than the second torque threshold, or that the time it takes for the handle to be switched from the reverse gear to the forward gear is greater than a fifth time threshold, as determined based on the handle signal.

[0141] It should be noted that the third and fourth conditions are both to exclude normal control and prevent false alarms.

[0142] If the first time period is greater than the first time threshold, or the second time period is greater than the second time threshold, or the third time period is greater than the third time threshold, it means that the abnormal situation has lasted for a period of time, and the power transmission direction is inconsistent with the driver's intention.

[0143] It should be noted that, since torque has occurred, power transmission has occurred at present, so the second time threshold is greater than or equal to 0 and less than the first time threshold. Moreover, the third time threshold is greater than or equal to 0 and less than the first time threshold. The first time threshold is greater than the fourth time threshold, the fourth time threshold is greater than the fifth time threshold, and the fifth time threshold is greater than or equal to 0. Moreover, the first time threshold, the second time threshold, the third time threshold, the fourth time threshold and the fifth time threshold are all related to the oil temperature.

[0144] In addition, those skilled in the art can set the first torque threshold and the second torque threshold according to actual needs, and the embodiments of the present application do not specifically limit this.

[0145] 2) The driver intends to go backward: based on the handle signal, it is determined that the handle is in the reverse gear.

[0146] If it is determined based on the handle signal that the handle is in reverse gear, and the conditions included in the second condition set are met at the same time, the sixth time period starts to increase, otherwise the sixth time period starts to decrease.

[0147] If the sixth time period is greater than the sixth time threshold, the power transmission direction does not match the driver's intention.

[0148] Among them, the second condition set includes the fifth condition and the third condition. The fifth condition is that the power transmission direction is forward, potential forward or potential situation, and the third condition is that the exit time of the handle to exit the forward gear or reverse gear based on the handle signal is greater than the fourth time threshold.

[0149] As a possible implementation method, if the power transmission direction does not match the driver's intention, the control disengages the transmission chain to interrupt the power transmission. For example, the transmission control unit should immediately request to disconnect the corresponding solenoid valve high-side drive until the end of this driving cycle. Among them, one driving cycle refers to the driver starting the engine and ending with the engine shutting down.

[0150] Therefore, by adopting the method for determining the power transmission direction provided in the embodiment of the present application, in the absence of a clutch position sensor or a clutch hydraulic sensor, the power transmission direction is determined by the current combination of the clutch combined with the planetary gear, and then it is determined whether the power transmission direction is consistent with the driver's intention. If the power transmission direction is opposite to the driver's intention, the transmission chain is controlled to be disengaged to interrupt the power transmission, thereby preventing safety accidents.

[0151] In addition to the method for determining the power transmission direction provided in the embodiment of the present application, a device for determining the power transmission direction is also provided, such as Figure 2 As shown, it includes: an acquisition unit 201, a detection unit 202 and a judgment unit 203;

[0152] The acquisition unit 201 is used to acquire a first standard clutch combination, wherein the first standard clutch combination includes a clutch combination that is a clutch combination combined with a planetary gear in each gear position during normal driving;

[0153] The detection unit 202 is used to detect the engagement state of each clutch and the planetary gear based on the current to obtain the current clutch combination;

[0154] The judgment unit 203 is used for determining that if the current clutch combination is consistent with the first standard clutch combination and the gear position corresponding to the current clutch combination is a forward gear, the power transmission direction is forward;

[0155] The judgment unit 203 is further configured to determine that if the current clutch combination is consistent with the first standard clutch combination and the gear corresponding to the current clutch combination is a reverse gear, then the power transmission direction is backward;

[0156] The judgment unit 203 is further configured to determine that if the current clutch combination is inconsistent with the first standard clutch combination, the power transmission direction is disengagement.

[0157] It can be seen from the above technical solution that the first standard clutch combination is obtained, and the clutch combination included in the first standard clutch combination is a combination of clutches combined with the planetary gear in each gear during normal driving. Since there is no clutch position sensor or clutch hydraulic sensor, it is necessary to detect the combination state of each clutch and the planetary gear based on the current to obtain the current clutch combination, that is, which clutches are currently combined with the planetary gear. If the current clutch combination is consistent with the first standard clutch combination, and the gear corresponding to the current clutch combination is the forward gear, it means that the current clutch combination is consistent with the clutch combination corresponding to the forward gear, and the power transmission direction is forward at this time; if the current clutch combination is consistent with the first standard clutch combination, and the gear corresponding to the current clutch combination is the reverse gear, it means that the current clutch combination is consistent with the clutch combination corresponding to the reverse gear, and the power transmission direction is backward at this time; if the current clutch combination is inconsistent with the first standard clutch combination, it means that the current clutch combination is not the clutch combination corresponding to the gear required during normal driving, and the power transmission direction is disengaged at this time, that is, there is no power transmission. Therefore, even if there is no clutch position sensor or clutch hydraulic sensor, the clutch combined with the planetary gear can be determined based on the current, and then compared with the first standard clutch combination to determine the power transmission direction.

[0158] As a possible implementation manner, the obtaining unit 201 is further configured to:

[0159] Acquire a second standard clutch combination and a third standard clutch combination, wherein the second standard clutch combination includes a clutch combination corresponding to the planetary gear set being in a locked state, and the third standard clutch combination includes a clutch combination that is replaced during a gear shifting process;

[0160] The judging unit 203 is further configured to:

[0161] If the current clutch combination is consistent with the second standard clutch combination, the power transmission direction is blocked; or,

[0162] If the number of clutches included in the current clutch combination is greater than the maximum number of shift combinations, the power transmission direction is blocked, and the maximum number of shift combinations is the value with the largest number of clutches among the clutch combinations included in the third standard clutch combination; or,

[0163] If the current clutch combination is consistent with the third standard clutch combination, and the current values ​​of the two interactive clutches are greater than the preset current threshold, the power transmission direction is blocked, and the interactive clutch is a clutch that is replaced during the gear shifting process.

[0164] As a possible implementation manner, the obtaining unit 201 is further configured to:

[0165] Acquire a third standard clutch combination, wherein the third standard clutch combination includes a clutch combination that is replaced during a gear shift process;

[0166] The judging unit 203 is further configured to:

[0167] If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are both forward gears, and the current value of one interactive clutch is less than the preset current threshold, then the power transmission direction is potential forward, and the interactive clutch is a clutch that is replaced during the gear shifting process; or,

[0168] If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are the forward gear and the reverse gear, respectively, and the current value of the clutch forming the reverse gear is less than the preset current threshold, and the current value of the clutch forming the forward gear is greater than or equal to the preset current threshold, then the power transmission direction is potential forward;

[0169] If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are the forward gear and the reverse gear, and the current value of the clutch forming the reverse gear is greater than or equal to the preset current threshold, and the current value of the clutch forming the forward gear is less than the preset current threshold, then the power transmission direction is potentially backward;

[0170] If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are the forward gear and the reverse gear, and the current value of the clutch that forms the reverse gear is less than the preset current threshold, and the current value of the clutch that forms the forward gear is less than the preset current threshold, then the power transmission direction is a potential situation.

[0171] As a possible implementation manner, the obtaining unit 201 is further configured to:

[0172] Acquiring a handle signal, wherein the handle signal is used to indicate the driver's intention;

[0173] The judging unit 203 is further configured to:

[0174] If it is determined based on the handle signal that the handle is in the forward gear and the conditions included in the first condition set are met at the same time, the third time period starts to increase, otherwise the third time period starts to decrease;

[0175] If the third time period is greater than a third time threshold, the power transmission direction is inconsistent with the driver's intention;

[0176] Among them, the first condition set includes a first condition, a second condition, a third condition and a fourth condition, the first condition is that the current clutch combination is not a clutch combination combined with a reverse gear, the second condition is that the power transmission direction is backward, potentially backward or a potential situation, the third condition is that based on the handle signal, it is determined that the exit time of the handle exiting the forward gear or the reverse gear is greater than a fourth time threshold, the fourth condition is that the engine torque is greater than the second torque threshold, or based on the handle signal, it is determined that the change time of the handle from the reverse gear to the forward gear is greater than a fifth time threshold.

[0177] As a possible implementation manner, the determining unit 203 is further configured to:

[0178] If it is determined based on the handle signal that the handle is in the forward gear, and the current clutch combination is a clutch combination for the reverse gear, the first time period starts to increase, otherwise the first time period starts to decrease;

[0179] If it is determined based on the handle signal that the handle is in the forward gear, and the current clutch combination is a clutch combination for the reverse gear, and the engine torque is greater than the first torque threshold, the second time period starts to increase, otherwise the second time period starts to decrease;

[0180] If the first time period is greater than a first time threshold, or the second time period is greater than a second time threshold, then the power transmission direction is inconsistent with the driver's intention.

[0181] As a possible implementation manner, the obtaining unit 201 is further configured to:

[0182] Acquiring a handle signal, wherein the handle signal is used to indicate the driver's intention;

[0183] The judging unit 203 is further configured to:

[0184] If it is determined based on the handle signal that the handle is in reverse gear and the conditions included in the second condition set are met at the same time, the sixth time period starts to increase, otherwise the sixth time period starts to decrease;

[0185] If the sixth time period is greater than a sixth time threshold, the power transmission direction is inconsistent with the driver's intention;

[0186] Among them, the second condition set includes the fifth condition and the third condition, the fifth condition is that the power transmission direction is forward, potential forward or potential, and the third condition is that based on the handle signal, it is determined that the exit time of the handle exiting the forward gear or the reverse gear is greater than a fourth time threshold.

[0187] As a possible implementation, the device further includes an execution unit, which is used to control the disengagement of the transmission chain to interrupt the power transmission if the power transmission direction is inconsistent with the driver's intention.

[0188] The present application also provides a computer device, see Figure 3 , which shows a structural diagram of a computer device provided in an embodiment of the present application, such as Figure 3 As shown, the device includes a memory 310 and a processor 320:

[0189] The memory 310 is used to store program codes and transmit the program codes to the processor;

[0190] The processor 320 is used to execute any one of the methods for determining the power transmission direction provided in the above embodiments according to the instructions in the program code.

[0191] An embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store a computer program, wherein the computer program is used to execute any one of the methods for determining the power transmission direction provided in the above embodiments.

[0192] The embodiment of the present application also provides a computer program product or a computer program, which includes a computer instruction stored in a computer-readable storage medium. The processor of the computer device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes the method for determining the power transmission direction provided in various optional implementations of the above aspects.

[0193] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0194] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0195] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0196] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0197] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for determining a power transmission direction, characterized in that: The method comprises: Acquire a first standard clutch combination, wherein the first standard clutch combination includes a clutch combination that is a combination of clutches combined with a planetary gear in each gear position during normal driving; Detecting the engagement state of each clutch and the planetary gear set based on the current to obtain the current clutch combination; If the current clutch combination is consistent with the first standard clutch combination, and the gear corresponding to the current clutch combination is the forward gear, the power transmission direction is forward; If the current clutch combination is consistent with the first standard clutch combination, and the gear corresponding to the current clutch combination is the reverse gear, the power transmission direction is backward; If the current clutch combination is inconsistent with the first standard clutch combination, the power transmission direction is disengagement.

2. The method according to claim 1, characterized in that: The method further comprises: Acquire a second standard clutch combination and a third standard clutch combination, wherein the second standard clutch combination includes a clutch combination corresponding to the planetary gear set being in a locked state, and the third standard clutch combination includes a clutch combination that is replaced during a gear shifting process; If the current clutch combination is consistent with the second standard clutch combination, the power transmission direction is blocked; or, If the number of clutches included in the current clutch combination is greater than the maximum number of shift combinations, the power transmission direction is blocked, and the maximum number of shift combinations is the value with the largest number of clutches among the clutch combinations included in the third standard clutch combination; or, If the current clutch combination is consistent with the third standard clutch combination, and the current values ​​of the two interactive clutches are greater than the preset current threshold, the power transmission direction is blocked, and the interactive clutch is a clutch that is replaced during the gear shifting process.

3. The method according to claim 1, characterized in that The method further comprises: Acquire a third standard clutch combination, wherein the third standard clutch combination includes a clutch combination that is replaced during a gear shift process; If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are both forward gears, and the current value of one interactive clutch is less than the preset current threshold, then the power transmission direction is potential forward, and the interactive clutch is a clutch that is replaced during the gear shifting process; or, If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are the forward gear and the reverse gear, respectively, and the current value of the clutch forming the reverse gear is less than the preset current threshold, and the current value of the clutch forming the forward gear is greater than or equal to the preset current threshold, then the power transmission direction is potential forward; If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are the forward gear and the reverse gear, and the current value of the clutch forming the reverse gear is greater than or equal to the preset current threshold, and the current value of the clutch forming the forward gear is less than the preset current threshold, then the power transmission direction is potentially backward; If the current clutch combination is consistent with the third standard clutch combination, and the two gears corresponding to the current clutch combination are the forward gear and the reverse gear, and the current value of the clutch that forms the reverse gear is less than the preset current threshold, and the current value of the clutch that forms the forward gear is less than the preset current threshold, then the power transmission direction is a potential situation.

4. The method according to claim 1, characterized in that: The method further comprises: Acquiring a handle signal, wherein the handle signal is used to indicate the driver's intention; If it is determined based on the handle signal that the handle is in the forward gear and the conditions included in the first condition set are met at the same time, the third time period starts to increase, otherwise the third time period starts to decrease; If the third time period is greater than a third time threshold, the power transmission direction is inconsistent with the driver's intention; Among them, the first condition set includes a first condition, a second condition, a third condition and a fourth condition, the first condition is that the current clutch combination is not a clutch combination combined with a reverse gear, the second condition is that the power transmission direction is backward, potentially backward or a potential situation, the third condition is that based on the handle signal, it is determined that the exit time of the handle exiting the forward gear or the reverse gear is greater than a fourth time threshold, the fourth condition is that the engine torque is greater than the second torque threshold, or based on the handle signal, it is determined that the change time of the handle from the reverse gear to the forward gear is greater than a fifth time threshold.

5. The method according to claim 4, characterized in that The method further comprises: If it is determined based on the handle signal that the handle is in the forward gear, and the current clutch combination is a clutch combination for the reverse gear, the first time period starts to increase, otherwise the first time period starts to decrease; If it is determined based on the handle signal that the handle is in the forward gear, and the current clutch combination is a clutch combination for the reverse gear, and the engine torque is greater than the first torque threshold, the second time period starts to increase, otherwise the second time period starts to decrease; If the first time period is greater than a first time threshold, or the second time period is greater than a second time threshold, then the power transmission direction is inconsistent with the driver's intention.

6. The method according to claim 1, characterized in that The method further comprises: Acquiring a handle signal, wherein the handle signal is used to indicate the driver's intention; If it is determined based on the handle signal that the handle is in reverse gear and the conditions included in the second condition set are met at the same time, the sixth time period starts to increase, otherwise the sixth time period starts to decrease; If the sixth time period is greater than a sixth time threshold, the power transmission direction is inconsistent with the driver's intention; Among them, the second condition set includes the fifth condition and the third condition, the fifth condition is that the power transmission direction is forward, potential forward or potential, and the third condition is that based on the handle signal, it is determined that the exit time of the handle exiting the forward gear or the reverse gear is greater than a fourth time threshold.

7. The method according to any one of claims 4 to 6, characterized in that: The method further comprises: If the power transmission direction does not match the driver's intention, the transmission chain is disengaged to interrupt power transmission.

8. A device for determining the direction of power transmission, characterized in that: The device comprises: an acquisition unit, a detection unit and a judgment unit; The acquisition unit is used to acquire a first standard clutch combination, wherein the first standard clutch combination includes a clutch combination that is a combination of clutches combined with the planetary gear in each gear position during normal driving; The detection unit is used to detect the engagement state of each clutch and the planetary gear based on the current to obtain the current clutch combination; The judgment unit is used for determining that if the current clutch combination is consistent with the first standard clutch combination and the gear position corresponding to the current clutch combination is a forward gear, then the power transmission direction is forward; The judgment unit is further configured to determine that if the current clutch combination is consistent with the first standard clutch combination and the gear corresponding to the current clutch combination is a reverse gear, then the power transmission direction is backward; The judgment unit is further configured to determine that if the current clutch combination is inconsistent with the first standard clutch combination, the power transmission direction is disengagement.

9. A computer device, characterized in that: The device comprises a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the method according to any one of claims 1 to 7 according to the instructions in the program code.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store a computer program, and the computer program is used to execute the method according to any one of claims 1 to 7.

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