A steady-state adaptive synchronization update method based on oil temperature

Abstract

The present invention provides a method for steady-state adaptive synchronous updating based on oil temperature, comprising: dividing the oil temperature in a torque model into multiple temperature zones; counting the total number of adaptations for each temperature zone across all driving scenarios, and dividing the temperature zones into high-frequency zones and low-frequency zones based on the total number of adaptations; determining whether the high-frequency zone adaptation has converged based on the number of adaptive activations and real-time adaptive anomaly values ​​in the high-frequency temperature zone; and correcting the torque-pressure relationship in the low-frequency temperature zone based on the total adaptive anomaly values ​​in the converged temperature zone. The method of the present invention achieves adaptive synchronous updating of the torque transfer characteristics in the temperature range where it is more difficult to activate adaptation based on the high-frequency temperature zone, ensuring that the basic characteristics of the clutch are more accurate at all temperatures, thereby ensuring actual vehicle performance.

Description

Technical Field

[0001] The present invention relates to the field of automobile clutch control methods, and in particular to a method for steady-state adaptive synchronous updating based on oil temperature. Background Art

[0002] When it comes to clutch control, the clutch's torque transfer characteristics directly impact torque accuracy, and thus overall vehicle performance. Many factors influence clutch torque transfer, but for wet clutches, the most significant factor affecting torque transfer is the clutch hydraulic oil temperature. Experiments have shown significant differences in clutch torque transfer characteristics at different oil temperatures; higher oil temperatures result in greater pressure for the same torque.

[0003] Currently, the most common steady-state adaptation is performed without considering the oil temperature or in different oil temperature ranges. Because the driving time at different oil temperatures is different in actual driving, the activation frequency of the adaptation in different oil temperature ranges will be different. This will result in frequent adaptation in some temperature ranges, while some temperature ranges will not adapt at all. If these temperature ranges that cannot adapt occur during driving, the performance of the entire vehicle will be relatively poor. Summary of the Invention

[0004] The present invention aims to address the problem in existing clutch control methods of steady-state adaptive control, which makes it difficult to adjust oil temperature ranges where adaptive activation is difficult, potentially resulting in poor vehicle performance. This invention provides a method for synchronously updating steady-state adaptive control based on oil temperature. This method enables adaptive synchronization of torque transfer characteristics in temperature ranges where adaptive activation is difficult, based on high-frequency temperature zones. This ensures more accurate basic clutch characteristics at all temperatures, thereby guaranteeing improved vehicle performance.

[0005] To solve the above technical problems, the present invention provides a method for steady-state adaptive synchronous updating based on oil temperature, comprising:

[0006] S1: Obtain pressure-torque characteristic data of the clutch at different oil temperatures, and divide the oil temperature in the torque model into multiple temperature zones based on the pressure-torque characteristic data;

[0007] S2: Simulate multiple driving scenarios and perform adaptive tests, count the total number of adaptive times for each temperature zone in all driving scenarios, and determine whether the total number of adaptive times is greater than the frequency threshold;

[0008] When the total number of adaptive times is greater than the frequency threshold, the corresponding temperature area is in the high frequency area;

[0009] When the total number of adaptive times is less than or equal to the frequency threshold, the corresponding temperature area is in the low frequency area;

[0010] S3: Counting the number of adaptive activations and real-time adaptive abnormality values ​​in each temperature zone in the high-frequency area during driving, and judging whether the adaptive operation in the high-frequency area has converged based on the number of adaptive activations and the real-time adaptive abnormality values;

[0011] If yes, proceed to step S4;

[0012] If not, continue to judge whether the high-frequency area adaptation has converged;

[0013] When the adaptive activation times of at least two adjacent temperature zones in the high frequency zone are both greater than the convergence times threshold, and the real-time adaptive abnormality values ​​of at least two adjacent temperature zones are both less than the abnormality threshold, it is determined that the high frequency zone has adaptively converged;

[0014] The real-time adaptive abnormal value is the value generated when the torque-pressure relationship of the currently stored temperature zone is inconsistent with the torque-pressure relationship during the real-time adaptive operation of the temperature zone;

[0015] S4: correcting the torque-pressure relationship of the temperature region in the low-frequency region according to the total adaptive abnormal value of at least two adjacent temperature regions, and synchronously updating the pressure value corresponding to the corrected torque-pressure relationship to each temperature region in the low-frequency region of the torque model;

[0016] The total adaptive abnormality value is a value generated when the torque-pressure relationship of the temperature region stored before the adaptive operation is inconsistent with the torque-pressure relationship of the temperature region after the convergence.

[0017] Using the above scheme, the present invention provides a method for steady-state adaptive synchronous updating based on oil temperature. First, the oil temperature is divided into zones. Due to different driving scenarios and operating conditions, the driving time in each oil temperature zone will vary, which will result in different frequencies of adaptive activation in different temperature zones. Then, the adaptive frequencies of different temperature zones in different scenarios are divided into high-frequency and low-frequency zones. The high-frequency zone is judged for convergence, and then, based on the adaptive abnormality values ​​of the high-frequency zone after convergence, the torque transfer characteristics of the temperature zone in the low-frequency zone are synchronously updated according to a certain logic. The present invention realizes the adaptive synchronous updating of the torque transfer characteristics of the temperature range that is difficult to activate adaptively based on the temperature zone of the high-frequency zone, ensuring that the basic characteristics of the clutch are more accurate at all temperatures, thereby ensuring the actual vehicle performance.

[0018] According to another specific embodiment of the present invention, the method for steady-state adaptive synchronous update based on oil temperature disclosed in the embodiment of the present invention, step S4 also includes, after judging convergence, selecting the real-time adaptive abnormal value of the temperature zone with the highest total number of adaptive times in the temperature zone of the high-frequency zone as the correction value, and using the correction value as the real-time adaptive abnormal value of the low-frequency zone to correct the torque-pressure relationship of the temperature zone in the low-frequency zone.

[0019] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a method for steady-state adaptive synchronous update based on oil temperature. In step S1, the pressure-torque characteristic data includes a torque-pressure relationship diagram under different oil temperatures. The oil temperature in the torque model is divided into multiple temperature zones according to the position and linearity of the curve in the torque-pressure relationship diagram at different oil temperatures, wherein the position and linearity of the torque-pressure curve in each temperature zone are similar.

[0020] According to another specific embodiment of the present invention, the method for steady-state adaptive synchronous updating based on oil temperature disclosed in the embodiment of the present invention, the adaptive abnormal numerical calculation method is:

[0021] Adaptive abnormal value = | theoretical pressure value - adaptive pressure value | / theoretical pressure value

[0022] The theoretical pressure value is the pressure value corresponding to a certain torque value in the stored torque-pressure relationship; the adaptive pressure value is the pressure value corresponding to the torque value in the torque-pressure relationship after adaptation.

[0023] According to another specific embodiment of the present invention, in the method of steady-state adaptive synchronous update based on oil temperature disclosed in the embodiment of the present invention, in step S4, the average value of the total adaptive abnormality values ​​of at least two adjacent temperature zones is calculated, and the average value is used as the total adaptive abnormality value of the low-frequency zone to correct the torque-pressure relationship of the temperature zone in the low-frequency zone.

[0024] According to another specific embodiment of the present invention, the method of steady-state adaptive synchronous update based on oil temperature disclosed in the embodiment of the present invention, step S4 also includes that the torque-pressure relationship of other temperature regions where the number of adaptations in the high-frequency zone has not reached the highest is updated according to its own adaptation.

[0025] According to another specific embodiment of the present invention, in the method for steady-state adaptive synchronous update based on oil temperature disclosed in the embodiment of the present invention, in step S1, the torque in the torque model is further divided into multiple torque ranges according to the pressure-torque characteristic data;

[0026] In step S3, the number of adaptive operations and the real-time adaptive abnormality value of each temperature zone in the high-frequency zone of each torque range are counted, and whether the high-frequency zone adaptation of the torque range has converged is determined based on the real-time adaptive operation and the adaptive abnormality value of the torque range;

[0027] In step S4, the torque-pressure relationship of the temperature zone in the low-frequency zone of the torque range is corrected according to the total adaptive abnormal value of at least two adjacent temperature zones corresponding to the torque range, and the pressure value corresponding to the corrected torque-pressure relationship is synchronously updated to each temperature zone in the low-frequency zone corresponding to the torque range.

[0028] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a method for steady-state adaptive synchronous update based on oil temperature. In step S1, the torque in the torque model is divided into multiple torque ranges according to the degree of linearity in the torque-pressure relationship diagram, wherein the slopes of the torque-pressure curves of each torque range in the torque-pressure relationship diagram are equal.

[0029] According to another specific embodiment of the present invention, in the method for steady-state adaptive synchronous updating based on oil temperature disclosed in the embodiment of the present invention, the abnormality threshold is 1%; and the convergence number threshold is 1-3 times.

[0030] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a method for steady-state adaptive synchronous update based on oil temperature, and multiple driving scenarios include high temperature environment, high cold environment, high altitude environment and plain environment.

[0031] The beneficial effects of the present invention are:

[0032] The oil temperature-based steady-state adaptive synchronous update method provided by the present invention first divides the oil temperature into zones. Due to different driving scenarios and operating conditions, the driving time in each oil temperature zone will vary, resulting in different frequencies of adaptive activation in different temperature zones. The method then divides the oil temperature into high-frequency and low-frequency zones based on the adaptive frequencies in different scenarios and temperature zones. The high-frequency zone is then subjected to convergence judgment, and then, based on the adaptive anomaly values ​​in the high-frequency zone after convergence, the torque transfer characteristics of the low-frequency temperature zone are synchronously updated according to a specific logic. The present invention achieves adaptive synchronous updating of the torque transfer characteristics in temperature ranges where adaptive activation is more difficult based on the high-frequency temperature zone, ensuring that the basic characteristics of the clutch are more accurate at all temperatures, thereby ensuring actual vehicle performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a torque-pressure relationship diagram at different oil temperatures for the oil temperature-based steady-state adaptive synchronous update method of the present invention. DETAILED DESCRIPTION

[0034] The following is an explanation of the embodiments of the present invention by specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0035] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0036] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0037] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0038] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0039] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0040] The present invention provides a method for steady-state adaptive synchronous updating based on oil temperature, which includes the following steps S1, S2, S3, and S4. These steps are described in detail below.

[0041] Step S1: obtaining pressure-torque characteristic data of the clutch at different oil temperatures, and dividing the oil temperature in the torque model into multiple temperature zones according to the pressure-torque characteristic data.

[0042] Specifically, the pressure-torque characteristic data of the clutch at different oil temperatures are obtained based on the torque transmission characteristics of the clutch and bench test data; the torque transmission characteristics and test data of the clutch particularly refer to the relationship between its own friction characteristics and temperature.

[0043] Multiple temperature zones can be divided into 4, 5, 6, 8, 10, etc. The basis for the division of temperature zones is that the clutch torque transmission characteristics can be considered to be the same within the same temperature zone. According to this principle, an upper temperature boundary and a lower temperature boundary are defined for each temperature zone. If the current clutch oil temperature is within these upper and lower boundaries, it is considered that the current oil temperature belongs to this temperature zone.

[0044] According to one specific embodiment of the present invention, the pressure-torque characteristic data includes a torque-pressure relationship diagram at different oil temperatures. The oil temperature in the torque model is divided into multiple temperature zones according to the position of the curve in the torque-pressure relationship diagram at different oil temperatures, wherein the position and linearity of the torque-pressure curve in each temperature zone are similar.

[0045] Specifically, in some embodiments, the torque-pressure relationship diagram at different oil temperatures is as follows: Figure 1 For example, the torque-pressure curves at oil temperatures between -40°C and -20°C are close and have similar slopes, falling within a certain range. This means that at the same torque point, the corresponding pressure values ​​within this oil temperature range are similar. Therefore, the -40°C to -20°C temperature range can be defined as a single temperature range. More specifically, multiple temperature ranges can be defined based on the torque-pressure relationship diagrams at different oil temperatures, as shown in Table 1, where the unit is °C.

[0046] Table 1

[0047] Temperature zone 1 Temperature zone 2 Temperature zone 3 Temperature zone 4 Temperature zone 5 Temperature zone 6 Temperature zone 7 Temperature zone 8 -40～-20 -20～0 0～20 20～40 40～60 60～80 80～100 100～120

[0048] According to one specific embodiment of the present invention, the torque in the torque model is further divided into multiple torque ranges based on the pressure-torque characteristic data. This allows each temperature region to be further divided into multiple torque ranges. For example, if the torque ranges are divided into four, namely, torque range 1, torque range 2, torque range 3, and torque range 4, then the torque corresponding to each temperature region, such as temperature range 1, is divided into torque range 1, torque range 2, torque range 3, and torque range 4. The torque ranges are divided based on the friction characteristics of the clutch, that is, the relationship between the torque transmitted by the clutch and the pressure.

[0049] According to one specific embodiment of the present invention, the torque in the torque model is divided into multiple torque ranges according to the linearity of the torque-pressure relationship diagram, wherein the slope of the torque-pressure curve of each torque range in the torque-pressure relationship diagram is substantially equal.

[0050] Step S2: Simulate multiple driving scenarios and perform adaptive tests, count the total number of adaptive times for each temperature zone in all driving scenarios, and determine whether the total number of adaptive times is greater than the frequency threshold; when the total number of adaptive times is greater than the frequency threshold, the corresponding temperature zone is in the high-frequency zone; when the total number of adaptive times is less than or equal to the frequency threshold, the corresponding temperature zone is in the low-frequency zone.

[0051] Different driving scenarios and operating conditions vary. The process of warming up a vehicle from cold to hot can vary under different circumstances. For example, variations in oil temperature can cause variations in the driving time in each temperature zone. Oil temperature fluctuations affect clutch torque transmission, leading to varying activation frequencies for adaptive control in different temperature zones, with some zones experiencing high activation rates, some low, and even difficulty activating in some. Therefore, we simulate various driving scenarios, subjecting the vehicle to different environments. Based on the pre-defined adaptive temperature zones, we calculate the adaptive frequency of each temperature zone. Based on multi-sample testing, we identify high-frequency zones with high adaptive probability and low-frequency zones with low adaptive probability.

[0052] The frequency threshold is determined based on actual test conditions, for example, based on statistical differences in results to distinguish between relatively high-frequency and relatively low-frequency adaptive regions. The frequency threshold is also related to the test duration. For example, based on the total number of adaptive times for the eight temperature regions described above, temperature regions 5, 6, and 7 are defined as high-frequency temperature regions, as shown in Table 2.

[0053] Table 2

[0054] Temperature zone 1 Temperature zone 2 Temperature zone 3 Temperature zone 4 Temperature zone 5 Temperature zone 6 Temperature zone 7 Temperature zone 8 Low-frequency area Low-frequency area Low-frequency area Low-frequency area High-frequency area High-frequency area High-frequency area Low-frequency area

[0055] It should be noted that the number of temperature zones divided into the high-frequency zone should not be too many, for example, 2-4. If there are too many high-frequency temperature zones after the adaptive test after the temperature zone division, it means that the temperature zone division is unreasonable and needs to be re-divided.

[0056] According to one embodiment of the present invention, multiple driving scenarios include high-temperature environments, cold-altitude environments, high-altitude environments, and plain environments. The high-temperature, high-altitude, and cold-altitude conditions referred to in this invention refer to the three high-temperature tests used in vehicle testing: high temperatures such as Hainan in summer, cold temperatures such as Mohe in winter, and high altitudes such as the snow-capped mountains of Shangri-La.

[0057] S3: Counting the number of adaptive activations and real-time adaptive abnormality values ​​in each temperature zone in the high-frequency zone during driving, and judging whether the adaptive control has converged in the high-frequency zone based on the number of adaptive activations and the real-time adaptive abnormality values; if so, executing step S4; if not, continuing to judge whether the adaptive control has converged in the high-frequency zone.

[0058] Among them, when the number of adaptive activations of at least two adjacent temperature zones in the high-frequency zone is greater than the convergence number threshold, wherein the two adjacent temperature zones are two temperature zones sharing a common temperature boundary value, and the real-time adaptive abnormality values ​​of at least two adjacent temperature zones are both less than the abnormality threshold, it is judged that the high-frequency zone adaptively converges, that is, the clutch torque transmission parameters of the temperature zone in the high-frequency zone have adapted OK; the real-time adaptive abnormality value is the value generated when the torque-pressure relationship of the currently stored temperature zone is inconsistent with the torque-pressure relationship during the real-time adaptation of the temperature zone.

[0059] Specifically, during actual driving, it is necessary to update the torque transfer characteristics of the low-frequency temperature zone based on the adaptive value of the high-frequency temperature zone after certain logical operations; after the adaptive judgment of the high-frequency temperature zone converges, the synchronous update action is performed.

[0060] The number of adaptive cycles accumulates over time. For example, if the current driving condition is within a certain temperature range and meets the adaptive conditions, after a certain period of time (e.g., 5 seconds), the adaptive cycle is activated again, increasing the adaptive cycle count by 1. The adaptive torque-pressure relationship is then stored in the controller. The convergence threshold can be determined based on actual conditions.

[0061] According to one specific embodiment of the present invention, the adaptive abnormal numerical calculation method is:

[0062] Adaptive abnormal value = | theoretical pressure value - adaptive pressure value | / theoretical pressure value

[0063] The theoretical pressure value is the pressure value corresponding to a certain torque value in the stored torque-pressure relationship. For real-time adaptive abnormality values, the theoretical pressure value is the pressure value corresponding to the torque-pressure relationship before the current adaptation. If adaptation has already occurred before the current adaptation, the torque-pressure relationship is the torque-pressure relationship obtained after the previous adaptation. The adaptive pressure value is the pressure value corresponding to the torque value in the torque-pressure relationship after the current adaptation. For example, if the controller currently stores the pressure required to transmit 50 Nm as 8 bar, but during the adaptive process, it is determined that the clutch requires 9 bar to transmit 50 Nm, then the adaptive abnormality value at this time is (9-8) / 8 = 12.5%.

[0064] According to one specific embodiment of the present invention, in step S1, the torque in the torque model is divided into multiple torque ranges according to the pressure-torque characteristic data; in step S3, the number of adaptations and the real-time adaptive abnormality value of each temperature zone in the high-frequency zone of each torque range are counted, and whether the high-frequency zone adaptation of the torque range has converged is judged based on the number of adaptations and the real-time adaptive abnormality value of the torque range.

[0065] For example, it is determined that temperature regions 5, 6, and 7 are high-frequency regions, and the torque range is divided into 4. The number of adaptive activations in each temperature region in each torque range is counted, as shown in Table 3.

[0066] Table 3

[0067]

[0068] According to one specific embodiment of the present invention, the abnormality threshold is 1%; and the convergence times threshold is 1-3 times.

[0069] More specifically, when the error threshold is set at 1% and the convergence threshold is set at 2, then if the adaptive activation counts a for at least two adjacent temperature zones within a certain torque range in the high-frequency region, such as temperature zone 5 in torque range 1 and the adaptive activation count b for temperature zone 6, are both greater than 2, and the real-time adaptive abnormality values ​​for temperature zones 5 and 6 in torque range 1 are both less than 1%, then the high-frequency region of torque range 1 is considered to have converged. Of course, if the adaptive counts for more than two adjacent temperature zones in the high-frequency region simultaneously meet the convergence criteria, then the high-frequency region of torque range 1 is also considered to have converged. Whether the other torque ranges 2 / 3 / 4 have converged depends on the adaptive determination of the temperature zones in the high-frequency regions of the corresponding torque ranges.

[0070] Step S4: correcting the torque-pressure relationship of the low-frequency temperature zone according to the total adaptive abnormal value of at least two adjacent temperature zones, and synchronously updating the pressure value corresponding to the corrected torque-pressure relationship to each temperature zone in the low-frequency zone of the torque model.

[0071] The total adaptive abnormality value is a value generated when the torque-pressure relationship of the temperature region stored before the adaptive operation is inconsistent with the torque-pressure relationship of the temperature region during convergence.

[0072] It should be noted that the update is performed during the convergence judgment process. When it is determined that the high-frequency temperature zone meets the convergence conditions, the low-frequency temperature zone is synchronously updated according to the update status of the high-frequency convergence temperature zone.

[0073] According to one specific embodiment of the present invention, the adaptive abnormal numerical calculation method is:

[0074] Adaptive abnormal value = | theoretical pressure value - adaptive pressure value | / theoretical pressure value

[0075] Among them, the total adaptive abnormal numerical theoretical pressure value is the pressure value corresponding to the torque-pressure relationship before activating the first adaptation; the adaptive pressure value is the pressure value corresponding to the torque-pressure relationship when the adaptive judgment converges.

[0076] According to one specific embodiment of the present invention, the torque-pressure relationship of other temperature regions in the high-frequency region where the number of adaptations has not reached the highest is updated based on its own adaptation.

[0077] Specifically, during and after convergence, the low-frequency temperature zones are synchronously updated based on the total adaptive anomaly value of the converged temperature zones. High-frequency temperature zones that have not converged are not updated synchronously; instead, they are updated through their own adaptive processes. For example, if high-frequency temperature zones 5 and 6 are converged, low-frequency temperature zones 1, 2, 3, 4, and 8 are updated based on the total adaptive anomaly value of temperature zones 5 and 6, while high-frequency temperature zone 7 is not updated synchronously. Similarly, if high-frequency temperature zones 6 and 7 are converged, low-frequency temperature zones 1, 2, 3, 4, and 8 are updated based on the total adaptive anomaly value of temperature zones 6 and 7, while high-frequency temperature zone 5 is not updated synchronously. Furthermore, if both temperature zones 5 and 6 are converged, the convergence of temperature zone 7 is constantly monitored. If so, the low-frequency temperature zone is synchronously updated using the total adaptive anomaly value of temperature zones 5, 6, and 7.

[0078] According to one specific embodiment of the present invention, in step S1, the torque in the torque model is further divided into multiple torque ranges based on the pressure-torque characteristic data; in step S4, the torque-pressure relationship of the temperature zone in the low-frequency zone of the torque range is corrected based on the total adaptive abnormal value of at least two adjacent temperature zones corresponding to the torque range, and the pressure value corresponding to the corrected torque-pressure relationship is synchronously updated to each temperature zone in the low-frequency zone corresponding to the torque range.

[0079] According to one specific embodiment of the present invention, a specific method for correcting the torque-pressure relationship of the temperature zone in the low-frequency zone based on the total adaptive abnormality value of at least two adjacent temperature zones is: calculating the average value of the total adaptive abnormality value of at least two adjacent temperature zones, and using the average value as the total adaptive abnormality value of the low-frequency zone to correct the torque-pressure relationship of the temperature zone in the low-frequency zone.

[0080] For example, when temperature zones 5 and 6 in the high-frequency zone of torque range 1 in Table 3 are both judged to have converged, and the total adaptive abnormality value of temperature zone 5 when converging is 3%, and the total adaptive abnormality value of temperature zone 5 when converging is 5%, then the average value is (3+5) / 2=4%; the average value of 4% is used to synchronously update temperature zones 1 / 2 / 3 / 4 / 8 in the low-frequency zone of torque range 1. That is to say, since the chance of adaptive activation of the low-frequency temperature zone is very small and it is difficult to adapt, it is considered that the total adaptive abnormality value of the low-frequency temperature zone is also 4% to achieve synchronous update.

[0081] According to one specific embodiment of the present invention, step S4 also includes, after determining convergence, selecting the real-time adaptive abnormality value of the temperature zone with the highest total adaptive times in the temperature zone of the high-frequency zone as a correction value, and using the correction value as the total adaptive abnormality value of the low-frequency zone to correct the torque-pressure relationship of the temperature zone in the low-frequency zone.

[0082] Full convergence is determined when convergence is complete and synchronization updates are complete. This method is used to quickly synchronize updates in the low-frequency area if real-time adaptation occurs again in the high-frequency area during normal vehicle use.

[0083] It should be noted that with the above solution, convergence determination and synchronous update are performed only once during vehicle use, and each low-frequency temperature zone is synchronously updated only once at the convergence moment. During subsequent driving, after convergence is determined, synchronous updates are performed according to this embodiment. For example, based on statistics, the high-frequency temperature zones are 5, 6, and 7, and temperature zone 6 has the highest adaptive frequency among the high-frequency temperature zones. After convergence, the adaptive value of temperature zone 6 is used for synchronous updates to more quickly update the other low-frequency temperature zones.

[0084] More specifically, after determining that temperature zones 5 and 6 have converged, the low-frequency temperature zone is updated based on the average of the total adaptive anomaly values ​​for temperature zones 5 and 6. If temperature zone 6 activates adaptive control again, assuming the real-time adaptive error threshold is 3%, the 3% value is used to synchronously update low-frequency temperature zones 1, 2, 3, 4, and 8. If temperature zone 6 activates adaptive control again, assuming the real-time adaptive error threshold is 2%, the 2% value is used to synchronously update temperature zones 1, 2, 3, 4, and 8. This update is repeated, depending on whether temperature zone 6 activates adaptive control. Other high-frequency temperature zones 5 and 7 are updated through their own adaptive control.

[0085] It should be noted that steps S1 and S2 are divided into pre-factory chassis tests, and the results are stored in a controller, such as a clutch control unit (TCU). Steps S3 and S4 are performed during vehicle use, based on the stored torque range and high-frequency range, controlled by a controller, such as the TCU.

[0086] The steady-state adaptive synchronous update method provided by the present invention first divides the oil temperature into zones. Due to different driving scenarios and operating conditions, the driving time in each oil temperature zone will vary, resulting in different frequencies of adaptive activation in different temperature zones. The method then divides the oil temperature into high-frequency and low-frequency zones based on the adaptive frequencies of different temperature zones in different scenarios. The high-frequency zone is then subjected to a convergence assessment, and then, based on the adaptive anomaly values ​​in the high-frequency zone after convergence, the torque transfer characteristics of the low-frequency temperature zone are synchronously updated according to a specific logic. The present invention achieves adaptive synchronous updating of the torque transfer characteristics in temperature ranges where adaptive activation is more difficult based on the high-frequency temperature zone, ensuring that the basic characteristics of the clutch are more accurate at all temperatures, thereby guaranteeing actual vehicle performance.

[0087] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above description is provided as a further detailed description of the present invention in conjunction with specific embodiments thereof, and that the specific implementation of the present invention is not limited to these descriptions. Those skilled in the art may make various changes in form and details, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A method for steady-state adaptive synchronous updating based on oil temperature, characterized in that: The method comprises: S1: Acquire pressure-torque characteristic data of the clutch at different oil temperatures, and divide the oil temperature in the torque model into multiple temperature zones according to the pressure-torque characteristic data; S2: Simulate multiple driving scenarios and perform adaptive testing, count the total number of adaptive times for each temperature zone in all driving scenarios, and determine whether the total number of adaptive times is greater than a frequency threshold; wherein, When the total number of adaptive times is greater than the frequency threshold, the corresponding temperature region is in the high frequency region; When the total number of adaptive times is less than or equal to the frequency threshold, the corresponding temperature region is in the low frequency region; S3: Counting the number of adaptive activations and the real-time adaptive abnormality value of each temperature zone in the high-frequency zone during driving, and determining whether the high-frequency zone adaptation has converged based on the number of adaptive activations and the real-time adaptive abnormality value; If yes, proceed to step S4; If not, continue to determine whether the high frequency region adaptation has converged; When the adaptive activation times of at least two adjacent temperature zones in the high frequency zone are both greater than the convergence times threshold, and the real-time adaptive abnormality values ​​of the at least two adjacent temperature zones are both less than the abnormality threshold, it is determined that the high frequency zone has adaptively converged; The real-time adaptive abnormal value is a value generated when the torque-pressure relationship of the temperature zone currently stored is inconsistent with the torque-pressure relationship during the real-time adaptive operation of the temperature zone; S4: correcting the torque-pressure relationship of the temperature zone in the low-frequency zone according to the total adaptive abnormal value of the at least two adjacent temperature zones, and synchronously updating the pressure value corresponding to the corrected torque-pressure relationship to each temperature zone in the low-frequency zone of the torque model; The total adaptive abnormal value is a value generated when the torque-pressure relationship of the temperature range stored before the adaptive operation is inconsistent with the torque-pressure relationship of the temperature range after the convergence.

2. The method for steady-state adaptive synchronous updating based on oil temperature according to claim 1, characterized in that: The step S4 also includes, after convergence is determined, selecting the real-time adaptive abnormality value of the temperature zone with the highest total adaptive times among the temperature zones in the high-frequency zone as a correction value, and using the correction value as the real-time adaptive abnormality value of the low-frequency zone to correct the torque-pressure relationship of the temperature zones in the low-frequency zone.

3. The method for steady-state adaptive synchronous updating based on oil temperature according to claim 2, characterized in that: In step S1, the pressure-torque characteristic data includes a torque-pressure relationship diagram at different oil temperatures. The oil temperature in the torque model is divided into multiple temperature zones according to the position and linearity of the curve in the torque-pressure relationship diagram at different oil temperatures, wherein the position and linearity of the torque-pressure curve in each temperature zone are similar.

4. The method for steady-state adaptive synchronous updating based on oil temperature according to claim 3, characterized in that: The adaptive abnormal numerical calculation method is: Adaptive abnormal value = | theoretical pressure value - adaptive pressure value | / theoretical pressure value The theoretical pressure value is the pressure value corresponding to a certain torque value in the stored torque-pressure relationship; The adaptive pressure value is a pressure value corresponding to the torque value in the torque-pressure relationship after adaptation.

5. The method for steady-state adaptive synchronous updating based on oil temperature according to claim 4, characterized in that: In step S4, an average value of the total adaptive abnormal values ​​of the at least two adjacent temperature zones is calculated, and the average value is used as the total adaptive abnormal value of the low-frequency zone to correct the torque-pressure relationship of the temperature zone in the low-frequency zone.

6. The method for steady-state adaptive synchronous updating based on oil temperature according to claim 5, characterized in that: The step S4 further includes updating the torque-pressure relationship of the temperature region whose adaptive times in the high-frequency region have not reached the highest level according to its own adaptive updating.

7. The method for steady-state adaptive synchronous updating based on oil temperature according to any one of claims 1 to 6, characterized in that: In the step S1, the torque in the torque model is further divided into a plurality of torque ranges according to the pressure-torque characteristic data; In step S3, the number of adaptive operations in each temperature zone of the high-frequency zone of each torque range and the real-time adaptive abnormality value are counted, and whether the high-frequency zone adaptation of the torque range has converged is determined based on the real-time adaptive operation number and the adaptive abnormality value of the torque range; In step S4, the torque-pressure relationship of the temperature zone in the low-frequency zone of the torque range is corrected according to the total adaptive abnormal value of the at least two adjacent temperature zones corresponding to the torque range, and the pressure value corresponding to the corrected torque-pressure relationship is synchronously updated to each temperature zone in the low-frequency zone corresponding to the torque range.

8. The method for steady-state adaptive synchronous updating based on oil temperature according to claim 7, characterized in that: In the step S1, The torque in the torque model is divided into a plurality of torque ranges according to the linearity of the torque-pressure relationship diagram, wherein the torque-pressure curves of each torque range in the torque-pressure relationship diagram have the same slope.

9. The method for steady-state adaptive synchronous updating based on oil temperature according to claim 7, characterized in that: The abnormal threshold is 1%; the convergence times threshold is 1-3 times.

10. The method for steady-state adaptive synchronous updating based on oil temperature according to any one of claims 1 to 6, characterized in that: The plurality of driving scenarios include a high temperature environment, a cold environment, a high altitude environment and a plain environment.

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