A planetary gear detection method and related device

Abstract

The present application discloses a planetary gear detection method and related device, which obtains a clutch combination blacklist and a clutch combination whitelist, detects the combination state of each clutch with the planetary gear, and determines the clutch combined with the planetary gear as the current clutch combination. If the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, it means that the current clutch combination blocks the output end of the planetary gear and cannot form a gear. The planetary gear has too many constraints, which will cause the transmission power of the planetary gear to be blocked, and the planetary gear is determined to be in a locked state. If the current clutch combination is different from the clutch combination included in the clutch combination whitelist, and the number of clutches included in the current clutch combination is greater than the maximum clutch number threshold, it means that the current clutch combination is not due to insufficient constraints and cannot form a gear. It may be that the planetary gear has too many constraints, which will cause the transmission power of the planetary gear to be blocked, and the planetary gear is determined to be in a locked state.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a planetary gear detection method and related devices. Background Art

[0002] Preventing unexpected vehicle deceleration is a key safety goal for powertrain systems. During driving, the automatic transmission should deliver engine torque smoothly and in accordance with the driver's expectations.

[0003] For an automatic transmission (AT) system equipped with a planetary gear, the transmission power of the planetary gear may be blocked, that is, the planetary gear is in a locked state, resulting in the risk of deceleration that is not intended by the driver. Summary of the Invention

[0004] In response to the above problems, the present application provides a planetary gear detection method and related devices for detecting whether the planetary gear is in a locked state, so as to avoid the risk of non-driver-intended deceleration due to power transmission interruption.

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

[0006] In one aspect, an embodiment of the present application provides a planetary gear detection method, the method comprising:

[0007] Obtaining a clutch combination blacklist and a clutch combination whitelist, wherein the clutch combination blacklist includes clutch combinations that block the output end of the planetary gear set from forming a gear, and the clutch combination whitelist includes clutch combinations that block the input end of the planetary gear set from forming a gear;

[0008] detecting a coupling state of each clutch with the planetary gear set to obtain a current clutch combination, wherein the current clutch combination includes a clutch coupled with the planetary gear set;

[0009] If the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, or if the current clutch combination is different from the clutch combination included in the clutch combination whitelist, and the number of clutches included in the current clutch combination is greater than the clutch maximum number threshold, it is determined that the planetary gear is in a locked state, and the clutch maximum number threshold is the maximum number of clutches combined with the planetary gear.

[0010] Optionally, if the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, or if the current clutch combination is different from the clutch combination included in the clutch combination whitelist, and the number of clutches included in the current clutch combination is greater than a clutch maximum number threshold, determining that the planetary gear set is in a locked state includes:

[0011] If the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, and the holding time of the current clutch combination exceeds a first time threshold, it is determined that the planetary gear set is in a locked state; or,

[0012] If the current clutch combination is different from the clutch combinations included in the clutch combination whitelist, the number of clutches included in the current clutch combination is greater than the maximum clutch number threshold, and the holding time of the current clutch combination exceeds the first time threshold, it is determined that the planetary gear is in a locked state.

[0013] Optionally, detecting the engagement state of each clutch with the planetary gear to obtain a current clutch combination includes:

[0014] acquiring a pressure value of each of the clutches based on a clutch pressure sensor;

[0015] Determine a clutch having a pressure value greater than a preset pressure threshold and a duration greater than a second time threshold as a clutch engaged with the planetary gear;

[0016] The current clutch combination is obtained according to the clutch combined with the planetary gear.

[0017] Optionally, detecting the engagement state of each clutch with the planetary gear to obtain a current clutch combination includes:

[0018] acquiring the position of each clutch based on a clutch position sensor;

[0019] determining the engagement state of each clutch and the planetary gear according to the position of each clutch;

[0020] Determine the clutch that is in the engaged state and lasts longer than a second time threshold as the clutch engaged with the planetary gear;

[0021] The current clutch combination is obtained according to the clutch combined with the planetary gear.

[0022] Optionally, detecting the engagement state of each clutch and the planetary gear to obtain the current clutch combination includes:

[0023] obtaining a clutch torque corresponding to a current of each of the clutches;

[0024] Determine the clutch whose clutch torque is greater than a preset torque threshold and whose duration is greater than a third time threshold as the clutch engaged with the planetary gear set;

[0025] The current clutch combination is obtained according to the clutch combined with the planetary gear.

[0026] Optionally, the method further includes:

[0027] Acquiring oil temperature and vehicle speed signals of the vehicle;

[0028] If the oil temperature is greater than a preset oil temperature threshold, and the vehicle speed signal indicates that the speed of the vehicle is greater than the vehicle speed threshold, a step is executed in which if the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, or if the current clutch combination is different from the clutch combination included in the clutch combination whitelist and the number of clutches included in the current clutch combination is greater than the maximum clutch number threshold, the step of determining that the planetary gear set is in a locked state is executed.

[0029] Optionally, the method further includes:

[0030] If it is determined that the planetary gear set is in a locked state, the transmission chain is controlled to be disengaged to interrupt power transmission.

[0031] On the other hand, the present application provides a planetary gear detection device, the device comprising: an acquisition unit, a detection unit, and a determination unit;

[0032] The acquisition unit is configured to acquire a clutch combination blacklist and a clutch combination whitelist, wherein the clutch combination blacklist includes clutch combinations that block the output end of the planetary gear set from forming a gear, and the clutch combination whitelist includes clutch combinations that block the input end of the planetary gear set from forming a gear;

[0033] The detection unit is used to detect the engagement state of each clutch and the planetary gear, and obtain a current clutch combination, wherein the current clutch combination includes the clutch and the planetary gear being engaged;

[0034] The determination unit is used to determine that the planetary gear set is in a locked state if the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, or if the current clutch combination is different from the clutch combination included in the clutch combination whitelist, and the number of clutches included in the current clutch combination is greater than a clutch maximum number threshold, and the clutch maximum number threshold is the maximum number of clutches combined with the planetary gear set.

[0035] Optionally, the determining unit is specifically configured to:

[0036] If the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, and the holding time of the current clutch combination exceeds a first time threshold, it is determined that the planetary gear set is in a locked state; or,

[0037] If the current clutch combination is different from the clutch combinations included in the clutch combination whitelist, the number of clutches included in the current clutch combination is greater than the maximum clutch number threshold, and the holding time of the current clutch combination exceeds the first time threshold, it is determined that the planetary gear is in a locked state.

[0038] Optionally, the detection unit is specifically used to:

[0039] acquiring a pressure value of each of the clutches based on a clutch pressure sensor;

[0040] Determine a clutch having a pressure value greater than a preset pressure threshold and a duration greater than a second time threshold as a clutch engaged with the planetary gear;

[0041] The current clutch combination is obtained according to the clutch combined with the planetary gear.

[0042] Optionally, the detection unit is specifically used to:

[0043] acquiring the position of each clutch based on a clutch position sensor;

[0044] determining the engagement state of each clutch and the planetary gear according to the position of each clutch;

[0045] Determine the clutch that is in the engaged state and lasts longer than a second time threshold as the clutch engaged with the planetary gear;

[0046] The current clutch combination is obtained according to the clutch combined with the planetary gear.

[0047] Optionally, the detection unit is specifically used to:

[0048] obtaining a clutch torque corresponding to a current of each of the clutches;

[0049] Determine the clutch whose clutch torque is greater than a preset torque threshold and whose duration is greater than a third time threshold as the clutch engaged with the planetary gear set;

[0050] The current clutch combination is obtained according to the clutch combined with the planetary gear.

[0051] Optionally, the acquiring unit is further configured to:

[0052] Acquiring oil temperature and vehicle speed signals of the vehicle;

[0053] If the oil temperature is greater than a preset oil temperature threshold, and the vehicle speed signal indicates that the speed of the vehicle is greater than a vehicle speed threshold, a determination unit is called.

[0054] Optionally, the device further includes an execution unit, configured to:

[0055] If it is determined that the planetary gear set is in a locked state, the transmission chain is controlled to be disengaged to interrupt power transmission.

[0056] In another aspect, the present application provides a computer device, comprising a processor and a memory:

[0057] The memory is used to store program code and transmit the program code to the processor;

[0058] The processor is configured to execute the method described above according to the instructions in the program code.

[0059] 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.

[0060] In another aspect, embodiments of the present application provide a computer program product or 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 executes the computer instructions, causing the computer device to perform the method described in the above aspects.

[0061] The advantages of the above technical solution of this application are:

[0062] A clutch combination blacklist and a clutch combination whitelist are obtained, wherein the clutch combination blacklist includes clutch combinations that block the output end of the planetary gear set and prevent gear formation, and the clutch combination whitelist includes clutch combinations that block the input end of the planetary gear set and prevent gear formation. The engagement state of each clutch and the planetary gear set is detected, and the clutch engaged with the planetary gear set is determined as the current clutch combination. If the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, it indicates that the planetary gear set has too many constraints, resulting in the blocking of the planetary gear set's power transmission, that is, the planetary gear set is in a locked state. If the current clutch combination is different from the clutch combination included in the clutch combination whitelist, and the number of clutches included in the current clutch combination is greater than the maximum clutch number threshold, that is, the number of clutches included in the current clutch combination is greater than the maximum number of clutches that can be engaged with the planetary gear set, and the current clutch combination is not unable to form a gear due to insufficient constraints, then it indicates that the planetary gear set has too many constraints, resulting in the blocking of the planetary gear set's power transmission, that is, the planetary gear set is in a locked state. Therefore, by detecting the current clutch combination and judging its relationship with the clutch combination blacklist and clutch combination whitelist, it is possible to quickly detect whether the planetary gear is in a locked state, so as to avoid the risk of non-driver-intended deceleration due to power transmission blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0064] Figure 1 A flow chart of a planetary gear detection method provided in an embodiment of the present application;

[0065] Figure 2 A schematic diagram of a planetary gear detection device provided in an embodiment of the present application;

[0066] Figure 3 A structural diagram of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0067] In order to help those skilled in the art better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0068] In the prior art, systems equipped with planetary automatic transmissions (ATs) are connected to multiple clutches, allowing for the formation of corresponding gears by combining different types and numbers of clutches. For example, a system equipped with a planetary automatic transmission may include six clutches, corresponding to clutches 1 through 6. Clutches 1, 2, and 3, when combined with the planetary transmission, correspond to forward gears; clutches 1, 2, and 4, when combined with the planetary transmission, correspond to reverse gears.

[0069] Research has found that when the clutch combined with the planetary gear is different from the clutch required for its corresponding gear, and this lasts for a period of time, the planetary gear will be blocked from transmitting power, causing the risk of the driver's unexpected deceleration.

[0070] Based on this, an embodiment of the present application provides a planetary gear detection method and related device, which determines whether there is a risk of power transmission blockage in the planetary gear by detecting the clutch combined with the planetary gear, thereby avoiding the risk of unexpected deceleration by the driver.

[0071] The following combination Figure 1 , a planetary gear detection method provided in an embodiment of the present application is introduced. Figure 1 In one implementation, the method shown can be executed by an electronic control unit (ECU) included in a vehicle, for example. Figure 1 , this figure is a flow chart of a planetary gear detection method provided in an embodiment of the present application, and the method may include S101-S103.

[0072] S101: Acquire a clutch combination blacklist and a clutch combination whitelist.

[0073] Among them, the clutch combination blacklist includes clutch combinations that block the output end of the planetary gear set and cannot form a gear, that is, the clutch combinations in the clutch combination blacklist have too many constraints, which may cause the planetary gear set to be in a locked state, resulting in the driver's unexpected deceleration due to the blocking of the planetary gear set's transmitted power.

[0074] The clutch combination whitelist includes clutch combinations that block the planetary gear input end and prevent the formation of gear. That is, the planetary gear corresponding to the clutch combination whitelist combination is not sufficiently constrained and cannot form a gear. For example, two clutches are connected to a component of the planetary gear, such as the ring gear, planet carrier, sun gear, etc.

[0075] As a possible implementation method, a method for obtaining a clutch combination blacklist and a clutch combination whitelist is introduced below.

[0076] Obtain the number of clutch combinations corresponding to each gear position in an automatic transmission system equipped with a planetary gearshift, such as N1, N2, and so on. Arrange the clutch combination numbers corresponding to each gear position from largest to smallest, resulting in a numerical arrangement, such as N1 > N2. Analyze clutch combinations with the same numerical value together, starting with the clutch combination with the largest numerical value, to ensure a comprehensive analysis and reduce subsequent workload. For example, the planetary gear corresponding to clutches 1, 2, and 3 does not transmit power, so the gear corresponding to the clutch combination consisting of clutches 1, 2, and 3 can also be a forward gear. The clutch combination corresponding to N1 is used as an example for explanation.

[0077] All clutch combinations corresponding to N1 are analyzed to determine whether they can form a gear. They can be divided into three categories: the first category is when the planetary gear output is blocked and a gear cannot be formed. These clutch combinations have too many planetary gear constraints, or in other words, they are added to the clutch combination blacklist. The second category is when the planetary gear input is blocked and a gear cannot be formed. These clutch combinations have insufficient planetary gear constraints, or in other words, they are added to the clutch combination whitelist. Analyzing the values ​​in order, all clutch combinations corresponding to each value are grouped and added to the corresponding lists, resulting in the clutch combination blacklist and clutch combination whitelist. The third category is when the planetary gear output can form a gear. These clutch combinations have just the planetary gear constraints to form a gear. It can be understood that the first and second categories are categories where no gear is formed. The third category is a category where a gear is formed.

[0078] Furthermore, in order to improve the accuracy of the clutch combination blacklist and clutch combination whitelist, the two lists can be further expanded and screened. Assuming that the clutch combination blacklist is represented by C01 and the clutch combination whitelist is represented by C02, the following is a detailed description.

[0079] Perform screening operations on each clutch combination included in the clutch combination blacklist C01: take a clutch combination included in the clutch combination blacklist C01 as an example, continuously reduce a clutch in the clutch combination, and then determine whether there are still too many constraints and the gear cannot be formed. If so, the clutch combination after the clutch is reduced is taken as a new clutch combination and added to the new clutch combination blacklist C1 until all the clutch combinations included in the old clutch combination blacklist C01 are screened.

[0080] Perform expansion operations on each clutch combination included in the clutch combination whitelist C02: Taking a clutch combination included in the clutch combination whitelist C02 as an example, continuously add clutches outside the clutch combination, and then determine whether the constraint is still insufficient to maintain the neutral state. If so, the clutch combination with the added clutch will be treated as a new clutch combination and added to the new clutch combination whitelist C2 until all the clutch combinations included in the old clutch combination whitelist C02 are expanded.

[0081] Thus, through continuous expansion and screening, a new clutch combination blacklist C1 and a new clutch combination whitelist C2 can be obtained, and subsequently, whether the current clutch combination is in a locked state can be determined based on the new clutch combination blacklist C1 and the new clutch combination whitelist C2. It is understandable that the clutch combinations included in the new clutch combination blacklist C1 may cause the corresponding planetary gear to be overly constrained, which may cause the planetary gear to be locked, resulting in unexpected deceleration for the driver due to the interruption of the planetary gear transmission power. The clutch combinations included in the new clutch combination whitelist C2 may cause the corresponding planetary gear to be insufficiently constrained and unable to form a gear, but will not cause the planetary gear transmission power to be interrupted.

[0082] S102: Detect the engagement status of each clutch and the planetary gear, and obtain the current clutch combination.

[0083] The current clutch combination includes a clutch coupled to a planetary gear set, i.e., the clutch coupled to the planetary gear set is detected to obtain the current clutch combination. The present embodiment does not specifically limit the detection method; for example, various sensors may be used to detect whether each clutch and planetary gear set is coupled to obtain the coupled state of each clutch and planetary gear set. The following uses three sensors as examples for illustration.

[0084] Method 1: Based on the clutch pressure sensor, the pressure value of each clutch is obtained, and the clutch with a pressure value greater than a preset pressure threshold and a duration greater than a second time threshold is determined to be the clutch combined with the planetary gear. The current clutch combination is obtained based on the clutch combined with the planetary gear.

[0085] Method 2: The position of each clutch is obtained based on the clutch position sensor, and the connection state of each clutch and the planetary gear is determined according to the position of each clutch. The clutch that is in the connection state and lasts longer than the second time threshold is determined to be the clutch connected to the planetary gear. The current clutch combination is obtained based on the clutch connected to the planetary gear.

[0086] Method 3: Obtain the clutch torque corresponding to the current of each clutch, and determine the clutch whose clutch torque is greater than the preset torque threshold and lasts longer than the third time threshold as the clutch combined with the planetary gear. Based on the clutch combined with the planetary gear, obtain the current clutch combination.

[0087] As a possible implementation method, since the preset torque threshold is related to the oil temperature and the engine torque, the preset torque threshold can be dynamically adjusted based on the oil temperature, wherein the lower the oil temperature, the greater the engine torque, and the corresponding larger the preset torque threshold.

[0088] As a possible implementation, since the third time threshold is related to oil temperature, the third time threshold can be dynamically adjusted based on the oil temperature. Specifically, the lower the oil temperature, the larger the third time threshold. The third time threshold needs to distinguish between the first pre-filling and non-first pre-filling situations. Since the clutch takes a long time to fill oil when it is first used, subsequent uses can be adjusted based on the first filling. Therefore, the first pre-filling will take longer than the non-first pre-filling. Therefore, the third time threshold corresponding to the first pre-filling can be slightly larger than the third time threshold for non-first pre-filling.

[0089] S103: If the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, or if the current clutch combination is different from the clutch combination included in the clutch combination whitelist, and the number of clutches included in the current clutch combination is greater than the clutch maximum number threshold, it is determined that the planetary gear is in a locked state.

[0090] If the current clutch combination matches the clutch combination blacklist, it means that the current clutch combination has too many constraints, which may cause the planetary gearbox to transmit power to be blocked, resulting in the driver's unintended deceleration. In this case, for safety reasons, the planetary gearbox can be determined to be in a locked state.

[0091] If the current clutch combination differs from any of the clutch combinations in the clutch combination whitelist, this indicates that the current clutch combination is not a clutch combination that blocks the planetary gear input and prevents gear formation. Furthermore, the number of clutches in the current clutch combination exceeds the maximum clutch count threshold, where the maximum clutch count threshold is the maximum number of clutches associated with the planetary gear, as described above (N1). In other words, if the current clutch combination includes a large number of clutches, but the constraints are not insufficient to prevent the planetary gear transmission from being blocked, then the constraints may be excessive. In this case, for safety reasons, the planetary gear can be determined to be locked.

[0092] As one possible implementation, if the planetary gearbox is determined to be locked, the transmission chain is disengaged to interrupt power transmission. For example, the transmission control unit could immediately request the high-side driver of the corresponding solenoid valve to disconnect the transmission chain and interrupt power transmission until the end of the current driving cycle. A driving cycle is defined as the period from when the driver starts the engine to when the engine is shut down.

[0093] As a possible implementation method, the vehicle's oil temperature and speed signals can be obtained first. If the oil temperature is greater than a preset oil temperature threshold, and the speed signal indicates that the vehicle's speed is greater than the speed threshold, it means that the current vehicle speed exists and is not a non-stationary or very low speed state. In addition, when the oil temperature signal is invalid, the oil temperature will be defaulted to a larger value, and then S103 will be executed to eliminate some false alarms and improve the accuracy of detection.

[0094] As a possible implementation, if the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, and the holding time of the current clutch combination exceeds the first time threshold, it is determined that the planetary gear is in a locked state; or,

[0095] If the current clutch combination is different from the clutch combinations included in the clutch combination whitelist, the number of clutches included in the current clutch combination is greater than the maximum clutch number threshold, and the holding time of the current clutch combination exceeds the first time threshold, it is determined that the planetary gear is in a locked state.

[0096] Therefore, when the number and type of clutches coupled to the planetary gear are different from those required for the corresponding gear, and the duration exceeds a period of time (i.e., the first time threshold), determining that the planetary gear is in a locked state can avoid some false alarms and improve detection accuracy.

[0097] According to the above technical solution, a clutch combination blacklist and a clutch combination whitelist are obtained for the clutch combination, wherein the clutch combination blacklist includes clutch combinations that block the output end of the planetary gear set and prevent the gear from being formed, and the clutch combination whitelist includes clutch combinations that block the input end of the planetary gear set and prevent the gear from being formed. The engagement state of each clutch and the planetary gear set is detected, and the clutch engaged with the planetary gear set is determined as the current clutch combination. If the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, it indicates that the planetary gear set has too many constraints, resulting in the blocking of the planetary gear set's power transmission, that is, the planetary gear set is in a locked state. If the current clutch combination is different from the clutch combination included in the clutch combination whitelist, and the number of clutches included in the current clutch combination is greater than the maximum clutch number threshold, that is, the number of clutches included in the current clutch combination is greater than the maximum number of clutches that can be engaged with the planetary gear set, and the current clutch combination is not unable to form a gear due to insufficient constraints, then it indicates that the planetary gear set has too many constraints, resulting in the blocking of the planetary gear set's power transmission, that is, the planetary gear set is in a locked state. Therefore, by detecting the current clutch combination and judging its relationship with the clutch combination blacklist and clutch combination whitelist, it is possible to quickly detect whether the planetary gear is in a locked state, so as to avoid the risk of non-driver-intended deceleration due to power transmission blockage.

[0098] In addition to the planetary gear detection method provided in the embodiment of the present application, a planetary gear detection device is also provided, such as Figure 2 As shown, it includes: an acquisition unit 201, a detection unit 202 and a determination unit 203;

[0099] The acquisition unit 201 is configured to acquire a clutch combination blacklist and a clutch combination whitelist, wherein the clutch combination blacklist includes clutch combinations that block the output end of the planetary gear set from forming a gear, and the clutch combination whitelist includes clutch combinations that block the input end of the planetary gear set from forming a gear;

[0100] The detection unit 202 is used to detect the engagement state of each clutch and the planetary gear, and obtain a current clutch combination, wherein the current clutch combination includes the clutch and the planetary gear;

[0101] The determination unit 203 is used to determine that the planetary gear set is in a locked state if the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, or if the current clutch combination is different from the clutch combination included in the clutch combination whitelist, and the number of clutches included in the current clutch combination is greater than the clutch maximum number threshold, and the clutch maximum number threshold is the maximum number of clutches combined with the planetary gear set.

[0102] According to the above technical solution, a clutch combination blacklist and a clutch combination whitelist are obtained, wherein the clutch combination blacklist includes clutch combinations that block the output end of the planetary gear set and prevent the formation of a gear, and the clutch combination whitelist includes clutch combinations that block the input end of the planetary gear set and prevent the formation of a gear. The engagement state of each clutch and the planetary gear set is detected, and the clutch engaged with the planetary gear set is determined as the current clutch combination. If the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, it indicates that the planetary gear set has too many constraints, resulting in the blocking of the planetary gear set's power transmission, that is, the planetary gear set is in a locked state. If the current clutch combination is different from the clutch combination included in the clutch combination whitelist, and the number of clutches included in the current clutch combination is greater than the maximum clutch number threshold, that is, the number of clutches included in the current clutch combination is greater than the maximum number of clutches that can be engaged with the planetary gear set, and the current clutch combination is not unable to form a gear due to insufficient constraints, then it indicates that the planetary gear set has too many constraints, resulting in the blocking of the planetary gear set's power transmission, that is, the planetary gear set is in a locked state. Therefore, by detecting the current clutch combination and judging its relationship with the clutch combination blacklist and clutch combination whitelist, it is possible to quickly detect whether the planetary gear is in a locked state, so as to avoid the risk of non-driver-intended deceleration due to power transmission blockage.

[0103] As a possible implementation manner, the determining unit 203 is specifically configured to:

[0104] If the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, and the holding time of the current clutch combination exceeds a first time threshold, it is determined that the planetary gear set is in a locked state; or,

[0105] If the current clutch combination is different from the clutch combinations included in the clutch combination whitelist, the number of clutches included in the current clutch combination is greater than the maximum clutch number threshold, and the holding time of the current clutch combination exceeds the first time threshold, it is determined that the planetary gear is in a locked state.

[0106] As a possible implementation, the detection unit 202 is specifically configured to:

[0107] acquiring a pressure value of each of the clutches based on a clutch pressure sensor;

[0108] Determine a clutch having a pressure value greater than a preset pressure threshold and a duration greater than a second time threshold as a clutch engaged with the planetary gear;

[0109] The current clutch combination is obtained according to the clutch combined with the planetary gear.

[0110] As a possible implementation, the detection unit 202 is specifically configured to:

[0111] acquiring the position of each clutch based on a clutch position sensor;

[0112] determining the engagement state of each clutch and the planetary gear according to the position of each clutch;

[0113] Determine the clutch that is in the engaged state and lasts longer than a second time threshold as the clutch engaged with the planetary gear;

[0114] The current clutch combination is obtained according to the clutch combined with the planetary gear.

[0115] As a possible implementation, the detection unit 202 is specifically configured to:

[0116] obtaining a clutch torque corresponding to a current of each of the clutches;

[0117] Determine the clutch whose clutch torque is greater than a preset torque threshold and whose duration is greater than a third time threshold as the clutch engaged with the planetary gear set;

[0118] The current clutch combination is obtained according to the clutch combined with the planetary gear.

[0119] As a possible implementation manner, the acquiring unit 201 is further configured to:

[0120] Acquiring oil temperature and vehicle speed signals of the vehicle;

[0121] If the oil temperature is greater than a preset oil temperature threshold, and the vehicle speed signal indicates that the vehicle speed is greater than a vehicle speed threshold, the determining unit 203 is called.

[0122] As a possible implementation manner, the apparatus further includes an execution unit, configured to:

[0123] If it is determined that the planetary gear set is in a locked state, the transmission chain is controlled to be disengaged to interrupt power transmission.

[0124] The present application also provides a computer device. Figure 3 , which shows a structural diagram of a computer device provided by an embodiment of the present application, such as Figure 3 As shown, the device includes a memory 310 and a processor 320:

[0125] The memory 310 is used to store program codes and transmit the program codes to the processor;

[0126] The processor 320 is configured to execute any planetary gear detection method provided in the above embodiments according to the instructions in the program code.

[0127] An embodiment of the present application provides a computer-readable storage medium, which is used to store a computer program. The computer program is used to execute any one of the planetary gear detection methods provided in the above embodiments.

[0128] The present application also provides a computer program product or 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 executes the computer instructions, causing the computer device to perform the planetary gear detection method provided in various optional implementations of the above aspects.

[0129] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the systems or devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0130] It should be understood that in this 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 previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items 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.

[0131] It should also be noted that, in this document, relational terms such as first and second, etc., are used only 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 "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0132] The steps of the methods or algorithms 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), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0133] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one 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 is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A planetary gear detection method, characterized in that: The method comprises: Obtaining a clutch combination blacklist and a clutch combination whitelist, wherein the clutch combination blacklist includes clutch combinations that block the output end of the planetary gear set from forming a gear, and the clutch combination whitelist includes clutch combinations that block the input end of the planetary gear set from forming a gear; detecting a coupling state of each clutch with the planetary gear set to obtain a current clutch combination, wherein the current clutch combination includes a clutch coupled with the planetary gear set; If the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, or if the current clutch combination is different from the clutch combination included in the clutch combination whitelist, and the number of clutches included in the current clutch combination is greater than the clutch maximum number threshold, it is determined that the planetary gear is in a locked state, and the clutch maximum number threshold is the maximum number of clutches combined with the planetary gear.

2. The method according to claim 1, characterized in that If the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, or if the current clutch combination is different from the clutch combination included in the clutch combination whitelist, and the number of clutches included in the current clutch combination is greater than a clutch maximum number threshold, then determining that the planetary gear set is in a locked state includes: If the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, and the holding time of the current clutch combination exceeds a first time threshold, it is determined that the planetary gear set is in a locked state; or, If the current clutch combination is different from the clutch combinations included in the clutch combination whitelist, the number of clutches included in the current clutch combination is greater than the maximum clutch number threshold, and the holding time of the current clutch combination exceeds the first time threshold, it is determined that the planetary gear is in a locked state.

3. The method according to claim 1, characterized in that The detecting the engagement state of each clutch and the planetary gear to obtain the current clutch combination includes: acquiring a pressure value of each of the clutches based on a clutch pressure sensor; Determine a clutch having a pressure value greater than a preset pressure threshold and a duration greater than a second time threshold as a clutch engaged with the planetary gear; The current clutch combination is obtained according to the clutch combined with the planetary gear.

4. The method according to claim 1, wherein The detecting the engagement state of each clutch and the planetary gear to obtain the current clutch combination includes: acquiring the position of each clutch based on a clutch position sensor; determining the engagement state of each clutch and the planetary gear according to the position of each clutch; Determine the clutch that is in the engaged state and lasts longer than a second time threshold as the clutch engaged with the planetary gear; The current clutch combination is obtained according to the clutch combined with the planetary gear.

5. The method according to claim 1, wherein The detecting the engagement state of each clutch and the planetary gear to obtain the current clutch combination includes: obtaining a clutch torque corresponding to a current of each of the clutches; Determine the clutch whose clutch torque is greater than a preset torque threshold and whose duration is greater than a third time threshold as the clutch engaged with the planetary gear set; The current clutch combination is obtained according to the clutch combined with the planetary gear.

6. The method according to claim 1, characterized in that The method further comprises: Obtain vehicle oil temperature and speed signals; If the oil temperature is greater than a preset oil temperature threshold, and the vehicle speed signal indicates that the speed of the vehicle is greater than the vehicle speed threshold, a step is executed in which if the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, or if the current clutch combination is different from the clutch combination included in the clutch combination whitelist and the number of clutches included in the current clutch combination is greater than the maximum clutch number threshold, the step of determining that the planetary gear set is in a locked state is executed.

7. The method according to any one of claims 1 to 6, characterized in that The method further comprises: If it is determined that the planetary gear set is in a locked state, the transmission chain is controlled to be disengaged to interrupt power transmission.

8. A planetary gear detection device, characterized in that: The device comprises: an acquisition unit, a detection unit and a determination unit; The acquisition unit is configured to acquire a clutch combination blacklist and a clutch combination whitelist, wherein the clutch combination blacklist includes clutch combinations that block the output end of the planetary gear set from forming a gear, and the clutch combination whitelist includes clutch combinations that block the input end of the planetary gear set from forming a gear; The detection unit is used to detect the engagement state of each clutch and the planetary gear, and obtain a current clutch combination, wherein the current clutch combination includes the clutch and the planetary gear; The determination unit is used to determine that the planetary gear set is in a locked state if the current clutch combination is the same as the clutch combination included in the clutch combination blacklist, or if the current clutch combination is different from the clutch combination included in the clutch combination whitelist, and the number of clutches included in the current clutch combination is greater than a clutch maximum number threshold, and the clutch maximum number threshold is the maximum number of clutches combined with the planetary gear set.

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