Clutch characteristic curve determination method, device, equipment and storage medium

Abstract

The present invention belongs to the field of vehicles and discloses a clutch characteristic curve determination method, apparatus, device, and storage medium. The method comprises: monitoring the clutch temperature in real time while the vehicle is traveling and determining the temperature range in which the clutch temperature is located; determining an initial clutch characteristic curve corresponding to the clutch temperature based on the clutch characteristic curve corresponding to the temperature range; determining whether there is a deviation in the initial clutch characteristic curve based on the clutch torque and clutch position during vehicle travel; and if so, correcting the initial clutch characteristic curve based on the clutch torque and clutch position to obtain a target clutch characteristic curve. Compared to existing methods that modify the clutch characteristic curve by adding a feedback term when the clutch temperature changes, the above-described method of the present invention can accurately identify the clutch characteristic curve at each temperature point during vehicle travel, thereby improving the stability of the clutch control system.

Description

Technical Field

[0001] The present invention relates to the technical field of clutch characteristic curve determination, and in particular to a clutch characteristic curve determination method, device, equipment and storage medium. Background Art

[0002] Vehicles with clutch transmission systems experience significant clutch temperature fluctuations during driving, with fluctuations exceeding 200°C. This is especially true for vehicles equipped with dry dual clutches, where a single high-throttle start can cause clutch temperature fluctuations exceeding 30°C. The clutch's inherent characteristics indicate that the clutch's friction coefficient changes with clutch temperature, which in turn causes the clutch's torque map to change with clutch temperature. The clutch's characteristic curve directly affects the vehicle's drivability, and an inaccurate clutch characteristic curve can result in a poor driving experience, such as jerking or ineffective acceleration. Therefore, accurately determining the clutch characteristic curve at different temperatures during vehicle driving has become a pressing technical issue.

[0003] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0004] The main purpose of the present invention is to provide a clutch characteristic curve determination method, device, equipment and storage medium, aiming to solve the technical problem of the prior art that the clutch characteristic curve at various temperatures cannot be accurately determined during vehicle driving.

[0005] To achieve the above object, the present invention provides a method for determining a clutch characteristic curve, the method comprising the following steps:

[0006] Monitor the clutch temperature in real time during vehicle driving and determine the temperature range of the clutch temperature;

[0007] determining an initial clutch characteristic curve corresponding to the clutch temperature according to the clutch characteristic curve corresponding to the temperature segment;

[0008] determining whether there is a deviation in the initial clutch characteristic curve according to the clutch torque and clutch position during vehicle driving;

[0009] If so, the initial clutch characteristic curve is corrected according to the clutch torque and clutch position to obtain a target clutch characteristic curve.

[0010] Optionally, after the step of correcting the initial clutch characteristic curve according to the clutch torque and clutch position to obtain a target clutch characteristic curve, the method further includes:

[0011] The clutch characteristic curve corresponding to each target temperature is determined according to the preset temperature torque offset table and the target clutch characteristic curve.

[0012] Optionally, before the step of determining the clutch characteristic curve corresponding to each target temperature according to the preset temperature torque offset table and the target clutch characteristic curve, the method further comprises:

[0013] Determine the initial temperature torque offset table for the test phase;

[0014] Obtaining the first clutch temperature collected by the temperature sensor during the actual vehicle phase and the second clutch temperature calculated by the target algorithm;

[0015] The initial temperature-torque offset table is corrected according to the first clutch temperature and the second clutch temperature to obtain a preset temperature-torque offset table.

[0016] Optionally, before the step of correcting the initial temperature-torque offset table according to the first clutch temperature and the second clutch temperature to obtain a preset temperature-torque offset table, the method further includes:

[0017] When the difference between the first clutch temperature and the second clutch temperature is greater than or equal to a preset temperature threshold, the target parameter in the target algorithm is modified until the difference between the first clutch temperature and the second clutch temperature is less than the preset temperature threshold.

[0018] Optionally, the step of determining an initial temperature-torque offset table for the test phase includes:

[0019] During the test phase, the drive motor torque and clutch temperature collected by the clutch thermometer are obtained when the clutch is in different positions;

[0020] generating a first clutch characteristic curve at different temperatures according to the clutch temperature, the current clutch position, and the drive motor torque;

[0021] selecting a reference clutch characteristic curve from the first clutch characteristic curves;

[0022] determining an offset between the first clutch characteristic curve and the reference clutch characteristic curve;

[0023] An initial temperature-torque offset table is generated according to the offset.

[0024] Optionally, the step of determining the initial clutch characteristic curve corresponding to the clutch temperature based on the clutch characteristic curve corresponding to the temperature segment includes:

[0025] The initial clutch characteristic curve corresponding to the clutch temperature is calculated using the following formula based on the clutch characteristic curve corresponding to the temperature segment:

[0026]

[0027] Among them, TorqueMap(T) is used to characterize the initial clutch characteristic curve. k ) is used to characterize the clutch characteristic curve corresponding to the lowest temperature endpoint in the temperature segment, TorqueMap(T k+1 ) is used to characterize the clutch characteristic curve corresponding to the highest temperature endpoint in the temperature segment, T is used to characterize the clutch temperature, T k+1 Used to characterize the highest temperature in the temperature range, T k Used to represent the lowest temperature in a temperature range.

[0028] Optionally, before the step of determining the initial clutch characteristic curve corresponding to the clutch temperature based on the clutch characteristic curve corresponding to the temperature segment, the method further comprises:

[0029] Obtain self-learning clutch characteristic curve;

[0030] The clutch characteristic curve corresponding to each temperature is determined according to the self-learning clutch characteristic curve and a preset temperature torque offset table.

[0031] In addition, to achieve the above-mentioned object, the present invention further provides a clutch characteristic curve determination device, the device comprising:

[0032] a temperature segment determination module, configured to monitor the clutch temperature in real time during vehicle travel and determine the temperature segment in which the clutch temperature is located;

[0033] an initial clutch characteristic curve determining module, configured to determine an initial clutch characteristic curve corresponding to the clutch temperature based on the clutch characteristic curve corresponding to the temperature segment;

[0034] a judgment module, configured to judge whether there is a deviation in the initial clutch characteristic curve according to the clutch torque and clutch position during vehicle driving;

[0035] A correction module is configured to correct the initial clutch characteristic curve according to the clutch torque and the clutch position to obtain a target clutch characteristic curve, if any.

[0036] In addition, to achieve the above-mentioned purpose, the present invention also proposes a clutch characteristic curve determination device, which includes: a memory, a processor, and a clutch characteristic curve determination program stored in the memory and executable on the processor, wherein the clutch characteristic curve determination program is configured to implement the steps of the clutch characteristic curve determination method as described above.

[0037] In addition, to achieve the above objectives, the present invention also proposes a storage medium, on which a clutch characteristic curve determination program is stored. When the clutch characteristic curve determination program is executed by a processor, the steps of the clutch characteristic curve determination method described above are implemented.

[0038] The present invention monitors clutch temperature in real time while the vehicle is in motion and determines the temperature range within which the clutch temperature falls. An initial clutch characteristic curve corresponding to the clutch temperature is determined based on the clutch characteristic curve corresponding to the temperature range. A determination is made as to whether there is a deviation in the initial clutch characteristic curve based on the clutch torque and clutch position during vehicle operation. If so, the initial clutch characteristic curve is corrected based on the clutch torque and clutch position to obtain a target clutch characteristic curve. Compared to existing methods that modify the clutch characteristic curve by adding a feedback control term when the clutch temperature changes, the present invention accurately identifies the clutch characteristic curve at each temperature point during vehicle operation, thereby improving the stability of the clutch control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 1 is a schematic structural diagram of a clutch characteristic curve determination device in a hardware operating environment according to an embodiment of the present invention;

[0040] Figure 2 Schematic diagram of the flow of a first embodiment of a clutch characteristic curve determination method according to the present invention;

[0041] Figure 3 Schematic diagram of clutch characteristic curves at various temperatures according to the first embodiment of the clutch characteristic curve determination method of the present invention;

[0042] Figure 4 Schematic diagram of the flow of a second embodiment of a clutch characteristic curve determination method according to the present invention;

[0043] Figure 5 This is a structural block diagram of the first embodiment of the clutch characteristic curve determination device of the present invention.

[0044] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0045] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0046] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of a device for determining a clutch characteristic curve in a hardware operating environment according to an embodiment of the present invention.

[0047] like Figure 1 As shown, the clutch characteristic curve determination device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to achieve connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and optionally the user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (WI-FI) interface). The memory 1005 may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as a disk storage. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0048] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation on the clutch characteristic curve determination device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0049] like Figure 1 As shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a clutch characteristic curve determination program.

[0050] exist Figure 1 In the clutch characteristic curve determination device shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the clutch characteristic curve determination device of the present invention can be set in the clutch characteristic curve determination device, and the clutch characteristic curve determination device calls the clutch characteristic curve determination program stored in the memory 1005 through the processor 1001, and executes the clutch characteristic curve determination method provided by the embodiment of the present invention.

[0051] Based on the above clutch characteristic curve determination device, the embodiment of the present invention provides a clutch characteristic curve determination method, referring to Figure 2 , Figure 2 1 is a flow chart of a first embodiment of a method for determining a clutch characteristic curve according to the present invention.

[0052] In this embodiment, the clutch characteristic curve determination method includes the following steps:

[0053] Step S10: monitoring the clutch temperature in real time during vehicle driving, and determining the temperature range of the clutch temperature.

[0054] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication, and program execution capabilities, such as a mobile phone, tablet computer, or personal computer, or an electronic device or clutch characteristic curve determination device capable of performing the aforementioned functions. This embodiment and the following embodiments will be described below using the clutch characteristic curve determination device as an example.

[0055] It should be noted that monitoring clutch temperature may involve calculating the vehicle's clutch temperature using a clutch temperature calculation algorithm. The clutch temperature calculation algorithm may be a pre-generated algorithm for calculating clutch temperature while the vehicle is in motion. A clutch characteristic curve corresponding to the clutch temperature is calculated based on pre-acquired clutch characteristic curves corresponding to various temperatures. Therefore, the temperature segment may be a temperature segment consisting of temperatures corresponding to the pre-acquired clutch characteristic curves. For example, before the vehicle is delivered to the customer, clutch characteristic curves for -30°C, 0°C, 30°C, 60°C, 90°C, 120°C, 150°C, 180°C, 210°C, and 240°C are obtained through training and correction. Adjacent temperatures form a temperature segment, such as -30°C-0°C, 0°C-30°C, or 30°C-60°C. Determining the clutch temperature segment may include determining within which of the aforementioned temperature segments the clutch temperature falls. For example, a clutch temperature of 25°C is within the 0°C-30°C temperature segment.

[0056] Step S20: determining an initial clutch characteristic curve corresponding to the clutch temperature according to the clutch characteristic curve corresponding to the temperature segment.

[0057] It should be noted that the clutch characteristic curve corresponding to the temperature segment may be the clutch characteristic curves corresponding to the two end points of the temperature segment. For example, when the temperature segment is 0°C-30°C, the clutch characteristic curve corresponding to the temperature segment may be the clutch characteristic curves corresponding to the temperature of 0°C and the temperature of 30°C.

[0058] Further, in order to accurately obtain the clutch characteristic curve corresponding to the clutch temperature during vehicle driving, the step of determining the initial clutch characteristic curve corresponding to the clutch temperature according to the clutch characteristic curve corresponding to the temperature segment includes:

[0059] Calculate the initial clutch characteristic curve corresponding to the clutch temperature according to the clutch characteristic curve corresponding to the temperature segment through the following formula:

[0060]

[0061] where TorqueMap(T) is used to represent the initial clutch characteristic curve, TorqueMap(T k ) is used to represent the clutch characteristic curve corresponding to the end point with the lowest temperature in the temperature segment, TorqueMap(T k+1 ) is used to represent the clutch characteristic curve corresponding to the end point with the highest temperature in the temperature segment, T is used to represent the clutch temperature, T k+1 is used to represent the highest temperature in the temperature segment, T k is used to represent the lowest temperature in the temperature segment.

[0062] In a specific implementation, when the clutch temperature during vehicle driving is T, obtain the temperatures corresponding to the pre-obtained clutch characteristic curves as [T0, T1, T2, T3......Tn], which can be [-30°C, 0°C, 30°C, 60°C, 90°C, 120°C, 150°C, 180°C, 210°C, 240°C]. Use a loop comparison method to determine the temperature segment where the current clutch temperature T is located. Assume Tk < T <= Tk+1, then it is considered that the current is in the (K + 1)th temperature segment. Then obtain the clutch characteristic curves TorqueMap(T k ) and TorqueMap(T k+1 ) at temperatures Tk and Tk+1, and calculate the initial clutch characteristic curve corresponding to the clutch temperature through the above formula.

[0063] Further, in order to accurately obtain the clutch characteristic curves corresponding to each temperature, before step S20, it further includes: obtaining a self-learning clutch characteristic curve; determining the clutch characteristic curves corresponding to each temperature according to the self-learning clutch characteristic curve and a preset temperature-torque offset table.

[0064] It should be noted that the self-learning clutch characteristic curve can be the clutch characteristic curve at a certain temperature obtained through self-learning. For example, the clutch characteristic curve at 30°C obtained through self-learning. The preset temperature-torque offset table can include the offsets of the clutch characteristic curves at each temperature relative to the clutch characteristic curve at the reference temperature obtained through pre-experiment calibration. For example, refer to the following

[0065] Table 1, Table 1 is the preset temperature torque offset table:

[0066]

[0067] Wherein, Offset(m, n) is used to represent the offset value at different torque points relative to the clutch characteristic curve corresponding to the reference temperature. m and n are used to represent the subscripts of the offset values ​​in Table 1. For example, taking the clutch characteristic curve at -30°C as the reference, Offset(0, 1) is the offset value of the clutch characteristic curve at a temperature of 0°C relative to the clutch characteristic curve at -30°C at a torque point of 0 NM.

[0068] In specific implementation, based on the self-learning clutch characteristic curve obtained by self-learning, and then using the preset temperature torque offset table obtained through test calibration, the clutch characteristic curve corresponding to each temperature can be derived. For details, please refer to Figure 3 , Figure 3 Schematic diagram of clutch characteristic curves at various temperatures according to the first embodiment of the clutch characteristic curve determination method of the present invention; Figure 3 The figure shows the clutch characteristic curves for temperatures of -30°C, 0°C, 30°C, and 60°C. The horizontal axis represents the clutch position, and the vertical axis represents the drive motor torque.

[0069] Step S30: determining whether there is any deviation in the initial clutch characteristic curve according to the clutch torque and clutch position during vehicle driving.

[0070] It should be noted that, based on the initial clutch characteristic curve, it can be determined whether the clutch torque and clutch position during the actual driving process of the vehicle are consistent with the corresponding clutch torque or clutch position in the initial clutch characteristic curve. If they are inconsistent, it indicates that there is a deviation in the initial clutch characteristic curve. In this case, it means that the initial clutch characteristic curve does not match the actual clutch characteristic curve. In order to avoid a bad driving experience such as vehicle jerking or acceleration failure, the initial clutch characteristic curve needs to be corrected according to the clutch torque and clutch position during the vehicle's driving process. If the clutch torque and clutch position during the vehicle's driving process are consistent with the clutch torque and clutch position in the initial clutch characteristic curve, it means that the initial clutch characteristic curve is relatively accurate and does not need to be corrected.

[0071] Step S40: If yes, the initial clutch characteristic curve is corrected according to the clutch torque and clutch position to obtain a target clutch characteristic curve.

[0072] It should be noted that the target clutch characteristic curve may be a clutch characteristic curve obtained by correcting the initial clutch characteristic curve according to the clutch torque and the clutch position.

[0073] Furthermore, the target clutch characteristic curve is the clutch characteristic curve corresponding to the current clutch temperature of the vehicle. However, during driving, the temperature of the clutch will change significantly, and the amplitude of the change may reach more than 200°C. Therefore, it is also necessary to calculate the clutch characteristic curve of the clutch at various temperatures based on the target clutch characteristic curve. After step S40, it also includes: determining the clutch characteristic curve corresponding to each target temperature based on the preset temperature torque offset table and the target clutch characteristic curve.

[0074] It should be noted that the temperature corresponding to the target clutch characteristic curve may not match the temperature in the preset temperature torque offset table. In this case, the clutch characteristic curve corresponding to each temperature cannot be directly determined based on the offset values ​​in the preset temperature torque offset table and the target clutch characteristic curve. For example, the preset temperature torque offset table contains the following temperatures: [-30°C, 0°C, 30°C, 60°C, 90°C, 120°C, 150°C, 180°C, 210°C, 240°C], but the target clutch characteristic curve corresponds to a temperature of 25°C. In this case, the target clutch characteristic curve corresponding to 25°C should be treated as a temperature in the preset temperature torque offset table and the clutch characteristic curve corresponding to each target temperature should be calculated based on the offset values ​​in the preset temperature torque offset table. For example, if the target clutch characteristic curve corresponds to a temperature of 25°C, the target clutch characteristic curve can be assigned the closest temperature in the preset temperature torque offset table, 30°C. In this case, the target temperatures can be [-35°C, -5°C, 25°C, 55°C, 85°C, 115°C, 145°C, 175°C, 205°C, 235°C]. For example, the offset between the clutch characteristic curves corresponding to 0°C and 30°C in the preset temperature torque offset table can be used as the offset between the clutch characteristic curves corresponding to -5°C and 25°C. The clutch characteristic curve corresponding to -5°C is then calculated based on the clutch characteristic curve corresponding to 25°C. The clutch characteristic curves corresponding to the target temperatures [-35°C, -5°C, 25°C, 55°C, 85°C, 115°C, 145°C, 175°C, 205°C, 235°C] are calculated in sequence.

[0075] This embodiment monitors clutch temperature in real time while the vehicle is in motion and determines the temperature range within which the clutch temperature falls. An initial clutch characteristic curve corresponding to the clutch temperature is determined based on the clutch characteristic curve corresponding to the temperature range. A determination is made as to whether there is a deviation from the initial clutch characteristic curve based on the clutch torque and clutch position during vehicle motion. If so, the initial clutch characteristic curve is modified based on the clutch torque and clutch position to obtain a target clutch characteristic curve. Compared to existing methods that modify the clutch characteristic curve by adding a feedback control term when the clutch temperature changes, this embodiment accurately identifies the clutch characteristic curve at each temperature point during vehicle motion, thereby improving the stability of the clutch control system.

[0076] refer to Figure 4 , Figure 4 1 is a flow chart of a third embodiment of a method for determining a clutch characteristic curve according to the present invention.

[0077] Based on the above embodiments, in this embodiment, before step S10, the method further includes:

[0078] Step S001: Determine the initial temperature torque offset table for the test phase.

[0079] It should be noted that the initial temperature-torque offset table for determining the test phase can be generated by gradually reducing the clutch pressure or position during the test phase so that a stable speed difference of about 10 rpm is maintained at both ends of the clutch, recording the clutch pressure or position, drive motor torque and clutch temperature at this time, and generating the initial temperature-torque offset table based on the recorded test data.

[0080] Furthermore, the step S001 may include: in the test phase, obtaining the driving motor torque and the clutch temperature collected by the clutch thermometer when the clutch is in different positions; generating a first clutch characteristic curve at different temperatures based on the clutch temperature, the current position of the clutch and the driving motor torque; selecting a reference clutch characteristic curve from the first clutch characteristic curve; determining the offset between the first clutch characteristic curve and the reference clutch characteristic curve; and generating an initial temperature torque offset table based on the offset.

[0081] It should be noted that the first clutch characteristic curve may be a clutch characteristic curve at different temperatures generated based on test data collected during a testing phase. The reference clutch characteristic curve may be a reference clutch characteristic curve selected from the first clutch characteristic curve for use in determining the initial temperature-torque offset table. The initial temperature-torque offset table can be generated based on the offset between the first clutch characteristic curve and the reference clutch characteristic curve at different torques.

[0082] Step S002: Acquire the first clutch temperature collected by the temperature sensor during the actual vehicle phase and the second clutch temperature calculated by the target algorithm.

[0083] It should be noted that the first clutch temperature collected by the temperature sensor may be a transmission assembly equipped with a clutch temperature sensor installed on an actual vehicle to collect the first clutch temperature during vehicle driving, and the target algorithm may be an algorithm for calculating the vehicle clutch temperature. The clutch temperature calculated by the target algorithm is the second clutch temperature.

[0084] Step S003: Correcting the initial temperature-torque offset table according to the first clutch temperature and the second clutch temperature to obtain a preset temperature-torque offset table.

[0085] It should be noted that there may be a deviation between the first clutch temperature collected by the temperature sensor and the second clutch temperature calculated by the target algorithm. When the vehicle is delivered to the customer, the clutch temperature used is the clutch temperature calculated according to the target algorithm. Therefore, it is necessary to correct the initial temperature torque offset table based on the first clutch temperature collected by the temperature sensor and the second clutch temperature calculated by the target algorithm to obtain the preset temperature torque offset table.

[0086] For example, if the first clutch temperature recorded by the temperature sensor is 30°C, and the second clutch temperature calculated by the target algorithm is 25°C, the offset corresponding to a temperature of 30°C in the initial temperature-torque offset table is equal to the offset corresponding to a temperature of 25°C calculated by the target software. Therefore, the offset corresponding to a temperature of 30°C in the initial temperature-torque offset table can be used as the offset corresponding to a second clutch temperature of 25°C. Alternatively, the offset corresponding to a temperature of 35°C in the initial temperature-torque offset table can be used to calculate the offset corresponding to a second clutch temperature of 30°C calculated by the target algorithm.

[0087] Furthermore, in order to avoid errors in the temperature calculated by the target algorithm, before step S003, it also includes: when the difference between the first clutch temperature and the second clutch temperature is greater than or equal to a preset temperature threshold, the target parameters in the target algorithm are corrected until the difference between the first clutch temperature and the second clutch temperature is less than the preset temperature threshold.

[0088] It should be noted that the preset temperature threshold can be a pre-set temperature threshold. When the difference between the first clutch temperature and the second clutch temperature is greater than or equal to the preset temperature threshold, it can be determined that there is an error in the temperature calculated by the target algorithm. At this time, the target parameters in the target algorithm need to be corrected until the difference between the first clutch temperature and the second clutch temperature is less than the preset temperature threshold.

[0089] This embodiment determines an initial temperature-torque offset table during the testing phase; obtains a first clutch temperature collected by a temperature sensor during the actual vehicle operation and a second clutch temperature calculated by a target algorithm; and modifies the initial temperature-torque offset table based on the first and second clutch temperatures to obtain a preset temperature-torque offset table. This embodiment pre-calculates the preset temperature-torque offset table through the testing and actual vehicle operation phases, allowing clutch characteristic curves at various temperatures to be calculated based on the clutch characteristic curve at a certain temperature. This allows accurate identification of the clutch characteristic curve at each temperature point during vehicle operation, thereby improving the stability of the clutch control system.

[0090] Reference Figure 5 , Figure 5 This is a structural block diagram of the first embodiment of the clutch characteristic curve determination device of the present invention.

[0091] like Figure 5 As shown, the clutch characteristic curve determination device proposed in the embodiment of the present invention includes:

[0092] The temperature segment determination module 10 is used to monitor the clutch temperature in real time during vehicle driving and determine the temperature segment in which the clutch temperature is located;

[0093] an initial clutch characteristic curve determining module 20, configured to determine an initial clutch characteristic curve corresponding to the clutch temperature based on the clutch characteristic curve corresponding to the temperature segment;

[0094] a judgment module 30 for judging whether there is a deviation in the initial clutch characteristic curve according to the clutch torque and clutch position during vehicle driving;

[0095] The correction module 40 is configured to correct the initial clutch characteristic curve according to the clutch torque and clutch position, if any, to obtain a target clutch characteristic curve.

[0096] This embodiment monitors clutch temperature in real time while the vehicle is in motion and determines the temperature range within which the clutch temperature falls. An initial clutch characteristic curve corresponding to the clutch temperature is determined based on the clutch characteristic curve corresponding to the temperature range. A determination is made as to whether there is a deviation from the initial clutch characteristic curve based on the clutch torque and clutch position during vehicle motion. If so, the initial clutch characteristic curve is modified based on the clutch torque and clutch position to obtain a target clutch characteristic curve. Compared to existing methods that modify the clutch characteristic curve by adding a feedback control term when the clutch temperature changes, this embodiment accurately identifies the clutch characteristic curve at each temperature point during vehicle motion, thereby improving the stability of the clutch control system.

[0097] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of the present invention. In practical applications, technicians in this field can select part or all of it according to actual needs to achieve the purpose of the embodiment scheme, and no limitation is made here.

[0098] In addition, for technical details not fully described in this embodiment, reference can be made to the clutch characteristic curve determination method provided in any embodiment of the present invention, and will not be repeated here.

[0099] Based on the first embodiment of the clutch characteristic curve determining device of the present invention, a second embodiment of the clutch characteristic curve determining device of the present invention is proposed.

[0100] In this embodiment, the correction module 40 is further configured to determine the clutch characteristic curve corresponding to each target temperature according to a preset temperature torque offset table and the target clutch characteristic curve.

[0101] Furthermore, the correction module 40 is also used to determine the initial temperature torque offset table during the test phase;

[0102] Obtaining the first clutch temperature collected by the temperature sensor during the actual vehicle phase and the second clutch temperature calculated by the target algorithm;

[0103] The initial temperature-torque offset table is corrected according to the first clutch temperature and the second clutch temperature to obtain a preset temperature-torque offset table.

[0104] Furthermore, the correction module 40 is also used to correct the target parameters in the target algorithm when the difference between the first clutch temperature and the second clutch temperature is greater than or equal to a preset temperature threshold, until the difference between the first clutch temperature and the second clutch temperature is less than the preset temperature threshold.

[0105] Furthermore, the correction module 40 is further configured to obtain the driving motor torque and the clutch temperature collected by the clutch thermometer when the clutch is in different positions during the test phase;

[0106] generating a first clutch characteristic curve at different temperatures according to the clutch temperature, the current clutch position, and the drive motor torque;

[0107] selecting a reference clutch characteristic curve from the first clutch characteristic curves;

[0108] determining an offset between the first clutch characteristic curve and the reference clutch characteristic curve;

[0109] An initial temperature-torque offset table is generated according to the offset.

[0110] Furthermore, the initial clutch characteristic curve determining module 20 is further configured to calculate the initial clutch characteristic curve corresponding to the clutch temperature according to the clutch characteristic curve corresponding to the temperature segment using the following formula:

[0111]

[0112] Among them, TorqueMap(T) is used to characterize the initial clutch characteristic curve. k ) is used to characterize the clutch characteristic curve corresponding to the lowest temperature endpoint in the temperature segment, TorqueMap(T k+1 ) is used to characterize the clutch characteristic curve corresponding to the highest temperature endpoint in the temperature segment, T is used to characterize the clutch temperature, T k+1 Used to characterize the highest temperature in the temperature range, T k Used to represent the lowest temperature in a temperature range.

[0113] Furthermore, the initial clutch characteristic curve determining module 20 is further configured to obtain a self-learning clutch characteristic curve;

[0114] The clutch characteristic curve corresponding to each temperature is determined according to the self-learning clutch characteristic curve and a preset temperature torque offset table.

[0115] Other embodiments or specific implementations of the clutch characteristic curve determination device of the present invention can refer to the above-mentioned method embodiments and will not be described in detail here.

[0116] In addition, an embodiment of the present invention further provides a storage medium, on which a clutch characteristic curve determination program is stored. When the clutch characteristic curve determination program is executed by a processor, the steps of the clutch characteristic curve determination method described above are implemented.

[0117] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system 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 system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0118] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0119] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as read-only memory / random access memory, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0120] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for determining a clutch characteristic curve, characterized in that: The clutch characteristic curve determination method comprises the following steps: Monitor the clutch temperature in real time during vehicle driving and determine the temperature range of the clutch temperature; determining an initial clutch characteristic curve corresponding to the clutch temperature according to the clutch characteristic curve corresponding to the temperature segment; determining whether there is a deviation in the initial clutch characteristic curve according to the clutch torque and clutch position during vehicle driving; If it exists, the initial clutch characteristic curve is corrected according to the clutch torque and clutch position to obtain a target clutch characteristic curve; The step of determining the initial clutch characteristic curve corresponding to the clutch temperature based on the clutch characteristic curve corresponding to the temperature segment includes: The initial clutch characteristic curve corresponding to the clutch temperature is calculated using the following formula based on the clutch characteristic curve corresponding to the temperature segment: Among them, TorqueMap(T) is used to characterize the initial clutch characteristic curve. k ) is used to characterize the clutch characteristic curve corresponding to the lowest temperature endpoint in the temperature segment, TorqueMap(T k+1 ) is used to characterize the clutch characteristic curve corresponding to the highest temperature endpoint in the temperature segment, T is used to characterize the clutch temperature, T k+1 Used to characterize the highest temperature in the temperature range, T k Used to represent the lowest temperature in the temperature range; After the step of correcting the initial clutch characteristic curve according to the clutch torque and the clutch position to obtain a target clutch characteristic curve, the method further includes: Determine the initial temperature torque offset table for the test phase; Obtaining the first clutch temperature collected by the temperature sensor during the actual vehicle phase and the second clutch temperature calculated by the target algorithm; Correcting the initial temperature-torque offset table according to the first clutch temperature and the second clutch temperature to obtain a preset temperature-torque offset table; The clutch characteristic curve corresponding to each target temperature is determined according to the preset temperature torque offset table and the target clutch characteristic curve.

2. The clutch characteristic curve determination method according to claim 1, characterized in that: Before the step of correcting the initial temperature-torque offset table according to the first clutch temperature and the second clutch temperature to obtain a preset temperature-torque offset table, the method further includes: When the difference between the first clutch temperature and the second clutch temperature is greater than or equal to a preset temperature threshold, the target parameter in the target algorithm is modified until the difference between the first clutch temperature and the second clutch temperature is less than the preset temperature threshold.

3. The clutch characteristic curve determination method according to claim 1, wherein: The step of determining the initial temperature torque offset table for the test phase includes: During the test phase, the drive motor torque and clutch temperature collected by the clutch thermometer are obtained when the clutch is in different positions; generating a first clutch characteristic curve at different temperatures according to the clutch temperature, the current clutch position, and the drive motor torque; selecting a reference clutch characteristic curve from the first clutch characteristic curves; determining an offset between the first clutch characteristic curve and the reference clutch characteristic curve; An initial temperature-torque offset table is generated according to the offset.

4. The clutch characteristic curve determination method according to any one of claims 1 to 3, characterized in that: Before the step of determining the initial clutch characteristic curve corresponding to the clutch temperature based on the clutch characteristic curve corresponding to the temperature segment, the method further includes: Obtain self-learning clutch characteristic curve; The clutch characteristic curve corresponding to each temperature is determined according to the self-learning clutch characteristic curve and a preset temperature torque offset table.

5. A clutch characteristic curve determination device, characterized in that: The clutch characteristic curve determining device is applied to the clutch characteristic curve determining method according to any one of claims 1 to 4, and the clutch characteristic curve determining device comprises: a temperature segment determination module, configured to monitor the clutch temperature in real time during vehicle travel and determine the temperature segment in which the clutch temperature is located; an initial clutch characteristic curve determining module, configured to determine an initial clutch characteristic curve corresponding to the clutch temperature based on the clutch characteristic curve corresponding to the temperature segment; a judgment module, configured to judge whether there is a deviation in the initial clutch characteristic curve according to the clutch torque and clutch position during vehicle driving; A correction module is configured to correct the initial clutch characteristic curve according to the clutch torque and the clutch position to obtain a target clutch characteristic curve, if any.

6. A clutch characteristic curve determination device, characterized in that: The device includes: a memory, a processor, and a clutch characteristic curve determination program stored in the memory and executable on the processor, wherein the clutch characteristic curve determination program is configured to implement the steps of the clutch characteristic curve determination method according to any one of claims 1 to 4.

7. A storage medium, characterized in that: The storage medium stores a clutch characteristic curve determination program, which, when executed by a processor, implements the steps of the clutch characteristic curve determination method according to any one of claims 1 to 4.

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