Control method, device and electronic equipment for intermediate shaft brake

Abstract

The present application relates to a control method, device, electronic device, storage medium, and computer program product for an intermediate shaft brake. The method includes: opening an intermediate shaft solenoid valve to brake the intermediate shaft; obtaining a real-time braking duration during the intermediate shaft braking process, where the real-time braking duration is the duration from the opening of the intermediate shaft solenoid valve to the current braking process; obtaining a braking demand duration and comparing the real-time braking duration with the braking demand duration; if the real-time braking duration is less than the braking demand duration, determining whether to release the intermediate shaft brake based on a nonlinear braking strategy; and if the real-time braking duration is greater than or equal to the braking demand duration, determining whether to release the intermediate shaft brake based on a linear braking strategy. This method can improve the accuracy of intermediate shaft braking control.

Description

Technical Field

[0001] The present application relates to the technical field of transmissions, and in particular to a control method, device, electronic device, and storage medium for an intermediate shaft brake. Background Art

[0002] With the development of transmission technology, the sliding gear sleeve shifting method is more and more widely used in AMT (automatic transmission). When the sliding gear sleeve shifts gears, it is necessary to shift gears within a suitable speed difference range. When the shift speed difference is not suitable, the sliding gear sleeve shifting will cause problems such as large shift shock, shift failure, and even damage to the sliding gear sleeve.

[0003] During a transmission upshift, the intermediate shaft brake can be applied to reduce the intermediate shaft speed, allowing the sliding sleeve to complete the shift at an appropriate speed difference. Conventional technology typically determines whether to release the intermediate shaft brake based on the intermediate shaft brake solenoid valve opening time and the intermediate shaft brake solenoid valve opening time target value. However, this approach takes too few factors into account, resulting in inaccurate intermediate shaft control. Summary of the Invention

[0004] Based on this, it is necessary to provide a control method, device, electronic device, computer-readable storage medium and computer program product for an intermediate shaft brake that can improve the control accuracy of intermediate shaft braking in order to address the above technical problems.

[0005] In a first aspect, the present application provides a method for controlling an intermediate shaft brake, the method comprising:

[0006] Open the intermediate shaft solenoid valve to brake the intermediate shaft;

[0007] Acquire the real-time braking duration during the intermediate shaft braking process, where the real-time braking duration is the duration from the intermediate shaft solenoid valve being turned on to the current braking process;

[0008] Obtaining a braking requirement duration, and comparing the real-time braking duration with the braking requirement duration;

[0009] If the real-time braking duration is less than the required braking duration, determining whether to release the intermediate shaft braking according to the nonlinear braking strategy;

[0010] If the real-time braking duration is greater than or equal to the required braking duration, it is determined whether to release the braking of the intermediate shaft according to a linear braking strategy.

[0011] In one embodiment, obtaining the braking requirement duration includes:

[0012] Obtaining the initial air supply pressure and initial transmission oil temperature when intermediate shaft braking begins;

[0013] The braking requirement duration is determined by looking up a table based on the initial air supply pressure and the initial transmission oil temperature.

[0014] In one embodiment, determining whether to release the intermediate shaft braking according to the nonlinear braking strategy includes:

[0015] Obtain the subsequent intermediate shaft speed reduction target value, the current real-time intermediate shaft speed, and the initial intermediate shaft speed;

[0016] Subtracting the current real-time intermediate shaft speed from the initial intermediate shaft speed to obtain a current intermediate shaft speed reduction value;

[0017] determining an overall intermediate shaft deceleration value based on an initial transmission oil temperature, an initial air supply pressure, and the real-time braking duration;

[0018] Whether to release the intermediate shaft brake is determined according to the subsequent intermediate shaft speed reduction target value, the current intermediate shaft speed reduction value, and the overall intermediate shaft speed reduction value.

[0019] In one embodiment, the determining whether to release the intermediate shaft brake according to the subsequent intermediate shaft speed reduction target value, the current intermediate shaft speed reduction value, and the overall intermediate shaft speed reduction value includes:

[0020] Subtracting the overall intermediate shaft speed reduction value from the current intermediate shaft speed reduction value to determine a subsequent intermediate shaft speed reduction estimate;

[0021] If the subsequent intermediate shaft speed reduction estimated value is greater than or equal to the subsequent intermediate shaft speed reduction target value, determining to release the intermediate shaft brake;

[0022] If the subsequent intermediate shaft speed reduction estimated value is less than the subsequent intermediate shaft speed reduction target value, the process returns to the step of opening the intermediate shaft solenoid valve to perform intermediate shaft braking.

[0023] In one embodiment, determining whether to release the intermediate shaft from braking according to a linear braking strategy includes:

[0024] Obtaining real-time transmission oil temperature, intermediate shaft deceleration rate, and subsequent intermediate shaft deceleration target value;

[0025] Determining a brake-release intermediate shaft deceleration value based on the real-time transmission oil temperature and the intermediate shaft deceleration rate;

[0026] If the intermediate shaft deceleration value for releasing the brake is greater than or equal to the subsequent intermediate shaft deceleration target value, determining to release the brake on the intermediate shaft;

[0027] If the brake-released intermediate shaft deceleration value is smaller than the subsequent intermediate shaft deceleration target value, the process returns to the step of opening the intermediate shaft solenoid valve to brake the intermediate shaft.

[0028] In one embodiment, after determining to release the intermediate shaft brake, the method further includes:

[0029] Obtain the current real-time intermediate shaft speed and intermediate shaft speed control target value;

[0030] If the current real-time intermediate shaft speed is less than the intermediate shaft speed control target value, the intermediate shaft solenoid valve is kept closed.

[0031] In one embodiment, the method further comprises:

[0032] If the current real-time intermediate shaft speed is greater than or equal to the intermediate shaft speed control target value, obtaining the intermediate shaft deceleration rate and the brake-release intermediate shaft deceleration value;

[0033] If the intermediate shaft deceleration rate is greater than or equal to the brake-releasing intermediate shaft deceleration value, returning to the step of determining to release the intermediate shaft brake;

[0034] If the intermediate shaft deceleration rate is less than the brake-release intermediate shaft deceleration value, determining whether the intermediate shaft brake solenoid valve closing time is greater than the intermediate shaft brake release time determination value;

[0035] When the closing time length of the intermediate shaft brake solenoid valve is less than the intermediate shaft brake release time determination value, the process returns to the step of determining to release the intermediate shaft brake.

[0036] In a second aspect, the present application further provides a control device for an intermediate shaft brake, the device comprising:

[0037] A control module is used to open the intermediate shaft solenoid valve to brake the intermediate shaft;

[0038] a data acquisition module, configured to acquire a real-time braking duration during the intermediate shaft braking process, wherein the real-time braking duration is the duration from the intermediate shaft solenoid valve being turned on to the current braking process;

[0039] a comparison module, configured to obtain a braking requirement duration, and compare the real-time braking duration with the braking requirement duration;

[0040] a first processing module, configured to determine whether to release the intermediate shaft braking according to a first braking strategy (nonlinear braking strategy) if the real-time braking duration is less than the required braking duration;

[0041] The second processing module is configured to determine whether to release the braking of the intermediate shaft according to a second braking strategy, namely a linear braking strategy, if the real-time braking duration is greater than or equal to the required braking duration.

[0042] In a third aspect, the present application further provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned intermediate shaft brake control method when executing the computer program.

[0043] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-mentioned intermediate shaft brake control method.

[0044] In a fifth aspect, the present application further provides a computer program product, which includes a computer program that implements the steps of the above-mentioned intermediate shaft brake control method when executed by a processor.

[0045] The above-mentioned intermediate shaft brake control method, device, electronic device, storage medium, and computer program product perform intermediate shaft braking by opening the intermediate shaft solenoid valve; obtaining the real-time braking duration during the intermediate shaft braking process, where the real-time braking duration is the duration from the opening of the intermediate shaft solenoid valve to the current braking process; obtaining the braking demand duration and comparing the real-time braking duration with the braking demand duration; if the real-time braking duration is less than the braking demand duration, determining whether to release the intermediate shaft brake according to a nonlinear braking strategy; and if the real-time braking duration is greater than or equal to the braking demand duration, determining whether to release the intermediate shaft brake according to a linear braking strategy. Therefore, by determining the corresponding braking strategy based on the real-time duration and the braking demand duration, the braking strategy is determined. Because the braking strategy matches the actual braking process, it can improve braking control accuracy and prevent overbraking and premature release. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 1 is a flow chart of a method for controlling an intermediate shaft brake in one embodiment;

[0047] Figure 2 1 is a flow chart of control steps of an intermediate shaft brake in one embodiment;

[0048] Figure 3 is a flow chart of a method for controlling an intermediate shaft brake in another embodiment;

[0049] Figure 4 is a structural block diagram of a control device for an intermediate shaft brake in one embodiment;

[0050] Figure 5 FIG. 1 is a diagram showing the internal structure of an electronic device in one embodiment. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0052] The control method of the intermediate shaft brake provided in the embodiment of the present application can be applied to an electronic device, wherein the electronic device can be a vehicle controller on a vehicle. In one embodiment, the electronic device

[0053] The intermediate shaft is braked by opening the intermediate shaft solenoid valve; and a real-time braking duration is obtained during the intermediate shaft braking process, where the real-time braking duration is the duration from the opening of the intermediate shaft solenoid valve to the current braking process.

[0054] Obtain the braking requirement duration and compare the real-time braking duration with the braking requirement duration; if the real-time braking duration is less than the braking requirement duration, determine whether to release the intermediate shaft braking based on a nonlinear braking strategy; if the real-time braking duration is greater than or equal to the braking requirement duration, determine whether to release the intermediate shaft braking based on a linear braking strategy.

[0055] In one embodiment, Figure 1 As shown, a control method for an intermediate shaft brake is provided.

[0056] The method is described as an example of applying the method to an electronic device, and includes the following steps:

[0057] Step S102: Open the intermediate shaft solenoid valve to brake the intermediate shaft.

[0058] Among them, the intermediate shaft solenoid valve is the one that can control the high-pressure gas to enter the brake cylinder, so that the piston

[0059] The valve moves forward under the action of high pressure gas, squeezing the steel sheet, causing sliding friction between the steel sheet and the friction plate to generate friction resistance torque, that is, braking torque, thereby reducing the speed of the intermediate shaft.

[0060] When the gear shift is required, the intermediate shaft solenoid valve can be controlled to open, thereby braking the intermediate shaft to achieve the purpose of reducing the intermediate shaft speed.

[0061] Step S104 , obtaining the real-time braking duration during the intermediate shaft braking process, where the real-time braking duration is the duration from the intermediate shaft solenoid valve being turned on to the current braking process.

[0062] 0 Among them, when the electronic device opens the intermediate solenoid valve, that is, at the moment when the intermediate shaft braking begins, the electronic device

[0063] The device will record an initial duration. As the braking process progresses, the duration from the initial duration to the current braking process is the real-time braking duration.

[0064] Step S106: Obtain the braking requirement duration, and compare the real-time braking duration with the braking requirement duration.

[0065] The braking demand time refers to the time period set to determine whether the intermediate shaft braking capacity has reached its maximum. Specifically, the braking demand time can be determined based on the initial oil temperature, initial oil pressure, and initial load at the time of intermediate shaft braking.

[0066] The air supply pressure is determined.

[0067] In one embodiment, after the electronic device obtains the braking requirement time and the real-time braking time, it can compare the braking requirement time and the real-time braking time. If the real-time braking time is less than the braking requirement time, it can indicate that the braking capacity of the intermediate shaft has not reached the maximum. If the real-time braking time is greater than or equal to the braking requirement time, it can indicate that the braking capacity of the intermediate shaft has reached the maximum.

[0068] In one embodiment, obtaining the braking requirement time includes: obtaining the initial air supply pressure and the initial transmission oil temperature when the intermediate shaft braking starts; and determining the braking requirement time by looking up a table based on the initial air supply pressure and the initial transmission oil temperature.

[0069] Among them, the initial air supply pressure refers to the air supply pressure of the intermediate shaft brake when the intermediate shaft starts to be formulated. The electronic equipment obtains the initial air supply pressure and the initial transmission oil temperature, and then determines the braking requirement time by looking up the table. Specifically, each set of initial air supply pressure and initial transmission oil temperature can correspond to a corresponding braking requirement time.

[0070] In the above embodiment, the initial air supply pressure and the initial transmission oil temperature are obtained, and then the braking requirement time is determined by looking up the table. Since the characteristics of the air pressure, oil temperature, etc. at the beginning of intermediate shaft braking are combined, a more accurate braking requirement time can be obtained.

[0071] Step S108: If the real-time braking duration is less than the required braking duration, it is determined whether to release the intermediate shaft braking according to the nonlinear braking strategy.

[0072] Among them, the nonlinear braking strategy refers to the strategy for the time lag characteristics and nonlinear braking of the intermediate shaft in the initial stage of braking. Among them, if the electronic device determines that the real-time braking duration is less than the braking requirement duration, the intermediate shaft speed and time are not in a completely linear relationship at this time. Therefore, the electronic device can determine whether to release the intermediate shaft brake based on the nonlinear braking strategy.

[0073] Step S110 : If the real-time braking duration is greater than or equal to the required braking duration, it is determined whether to release the intermediate shaft braking according to the linear braking strategy.

[0074] Among them, the linear braking strategy is a strategy formulated for the later stage of intermediate shaft braking. At this time, the relationship between the change of intermediate shaft speed and time has changed. Therefore, if the electronic device determines that the real-time braking duration is greater than or equal to the braking demand duration, there is a linear relationship between the intermediate shaft speed and time. Therefore, the electronic device can determine whether to release the intermediate shaft brake based on the linear braking strategy.

[0075] In the above-mentioned intermediate shaft brake control method, intermediate shaft braking is performed by opening the intermediate shaft solenoid valve; the real-time braking duration during the intermediate shaft braking process is obtained, which is the duration from the opening of the intermediate shaft solenoid valve to the current braking process; the braking demand duration is obtained and compared with the real-time braking duration; if the real-time braking duration is less than the braking demand duration, a nonlinear braking strategy is used to determine whether to release the intermediate shaft brake; if the real-time braking duration is greater than or equal to the braking demand duration, a linear braking strategy is used to determine whether to release the intermediate shaft brake. Therefore, by determining the corresponding braking strategy based on the real-time duration and the braking demand duration, the braking strategy is determined. Because the braking strategy matches the actual braking process, it can improve braking control accuracy and prevent overbraking and premature release.

[0076] Among them, after the electronic device determines the braking strategy, it can determine whether to release the intermediate shaft brake according to the braking strategy. Specifically, in one embodiment, according to the first braking strategy nonlinear braking strategy, it is determined whether to release the intermediate shaft brake, including: obtaining the subsequent intermediate shaft deceleration target value, the current real-time intermediate shaft speed and the initial intermediate shaft speed; subtracting the current real-time intermediate shaft speed from the initial intermediate shaft speed to obtain the current intermediate shaft deceleration value; determining the overall intermediate shaft deceleration value based on the initial transmission oil temperature, the initial air supply pressure and the real-time braking duration; and determining whether to release the intermediate shaft brake according to the subsequent intermediate shaft deceleration target value, the current intermediate shaft deceleration value and the overall intermediate shaft deceleration value.

[0077] Among them, the subsequent intermediate shaft deceleration target value may refer to the speed difference target value between the decelerations at each moment in the subsequent deceleration process; the current real-time intermediate shaft speed refers to the actual speed of the intermediate shaft at the current moment; the initial intermediate shaft speed refers to the speed of the intermediate shaft when the intermediate shaft braking begins; the current intermediate shaft deceleration value refers to the speed difference between the intermediate shaft speeds from the initial moment to the current moment. Specifically, the electronic device may determine the current intermediate shaft deceleration value by subtracting the real-time intermediate shaft speed from the current real-time intermediate shaft speed.

[0078] Among them, the overall intermediate shaft deceleration value refers to the value obtained by looking up the table based on the initial transmission oil temperature, the initial air supply pressure and the real-time braking duration. The electronic device can determine whether to release the intermediate shaft brake based on the subsequent intermediate shaft deceleration target value, the current intermediate shaft deceleration value and the overall intermediate shaft deceleration value.

[0079] In the above embodiment, when the electronic device determines whether to release the intermediate shaft brake through the subsequent intermediate shaft deceleration target value, the current intermediate shaft deceleration value and the overall intermediate shaft deceleration value, it adapts well to the time lag characteristics and nonlinearity of the initial intermediate shaft braking, and prevents the occurrence of over-braking and premature brake release problems.

[0080] In one embodiment, whether to release the intermediate shaft brake is determined based on the subsequent intermediate shaft deceleration target value, the current intermediate shaft deceleration value and the overall intermediate shaft deceleration value, including: taking the difference between the overall intermediate shaft deceleration value and the current intermediate shaft deceleration value to determine the subsequent intermediate shaft deceleration estimated value; if the subsequent intermediate shaft deceleration estimated value is greater than or equal to the subsequent intermediate shaft deceleration target value, determining to release the intermediate shaft brake; if the subsequent intermediate shaft deceleration estimated value is less than the subsequent intermediate shaft deceleration target value, returning to the step of opening the intermediate shaft solenoid valve to perform intermediate shaft braking.

[0081] Among them, the electronic device can obtain an estimated intermediate shaft speed reduction value by subtracting the overall intermediate shaft speed reduction value from the current intermediate shaft speed reduction value, and then compare the estimated intermediate shaft speed reduction value with the subsequent intermediate shaft speed reduction target value. If the estimated intermediate shaft speed reduction value is greater than or equal to the subsequent intermediate shaft speed reduction target value, it is determined to release the intermediate shaft brake; if the estimated intermediate shaft speed reduction value is less than the subsequent intermediate shaft speed reduction target value, it returns to execute the step of opening the intermediate shaft solenoid valve and performing intermediate shaft braking.

[0082] In the above embodiment, the electronic device determines whether to release the intermediate shaft brake by comparing the estimated intermediate shaft deceleration value with the overall intermediate shaft deceleration value, thereby avoiding the problem of long intermediate shaft speed regulation time and multiple brake applications caused by premature brake release.

[0083] Among them, after the electronic device determines the braking strategy, it can determine whether to release the intermediate shaft from braking according to the braking strategy. Specifically, in one embodiment, according to the linear braking strategy, it is determined whether to release the intermediate shaft from braking, including: obtaining the real-time transmission oil temperature, the intermediate shaft deceleration rate and the subsequent intermediate shaft deceleration target value; determining the brake-release intermediate shaft deceleration value based on the real-time transmission oil temperature and the intermediate shaft deceleration rate; if the brake-release intermediate shaft deceleration value is greater than or equal to the subsequent intermediate shaft deceleration target value, determining to release the intermediate shaft from braking; if the brake-release intermediate shaft deceleration value is less than the subsequent intermediate shaft deceleration target value, returning to the step of opening the intermediate shaft solenoid valve to perform intermediate shaft braking.

[0084] Among them, releasing the brake on the intermediate shaft refers to closing the intermediate shaft solenoid valve, the real-time transmission oil temperature refers to the transmission oil temperature at the current moment, the intermediate shaft deceleration rate refers to the rate of change of the intermediate shaft speed from the previous moment to the current moment, and the braking-released intermediate shaft deceleration value refers to the calculated intermediate shaft deceleration speed difference after the intermediate shaft is braked. Specifically, the electronic device can determine the braking-released intermediate shaft deceleration value based on the real-time transmission oil temperature and the intermediate shaft deceleration rate, and finally compare the braking-released intermediate shaft deceleration value with the subsequent intermediate shaft deceleration target value to determine whether to release the brake on the intermediate shaft or return to execute the step of opening the intermediate shaft solenoid valve and performing intermediate shaft braking.

[0085] In the above embodiment, the electronic device determines whether to release the braking of the intermediate shaft by comparing the braking release intermediate shaft deceleration value with the subsequent intermediate shaft deceleration target value. This well combines the changing characteristics of the intermediate shaft braking in the later stage and can effectively prevent the occurrence of over-braking and premature braking problems.

[0086] In one embodiment, after determining to release the intermediate shaft brake, the method further includes: obtaining the current real-time intermediate shaft speed and the intermediate shaft speed control target value; if the current real-time intermediate shaft speed is less than the intermediate shaft speed control target value, keeping the intermediate shaft solenoid valve closed.

[0087] The intermediate shaft speed control target value refers to the target value that needs to be reached after the initial intermediate shaft speed is reduced. Specifically, the electronic device obtains the current intermediate shaft speed, the intermediate shaft speed control target value, and the intermediate shaft speed control target value.

[0088] After the calibration value is set, if it is determined that the current real-time intermediate shaft speed is less than the intermediate shaft speed control target value, the intermediate shaft solenoid valve can be kept closed, that is, the real-time intermediate shaft speed at this time has reached the control target.

[0089] To keep the intermediate shaft solenoid valve closed.

[0090] In the above embodiment, when the electronic device determines that the current real-time intermediate shaft speed is less than the intermediate shaft speed control target value, it means that the intermediate shaft solenoid valve can be kept closed, thereby ensuring that the sliding gear sleeve shifts successfully when the intermediate shaft speed reaches the intermediate shaft speed control target value, thereby reducing the gear shift shock.

[0091] 0 Among them, after the electronic device controls the closing of the intermediate shaft solenoid valve, the electronic device will also

[0092] When the intermediate shaft speed is greater than or equal to the intermediate shaft speed control target value, corresponding control is performed to reduce the number of times the intermediate shaft brake solenoid valve is used. In one embodiment, when the current intermediate shaft speed is greater than or equal to the intermediate shaft speed control target value, the following steps are included:

[0093] Step S202: If the current real-time intermediate shaft speed is greater than or equal to the intermediate shaft speed control target value, then obtain the intermediate shaft deceleration rate and the brake-release intermediate shaft deceleration value.

[0094] Among them, the brake-release intermediate shaft deceleration value refers to the deceleration value of the intermediate shaft when the brake is released, which is determined by the initial transmission oil temperature and the intermediate shaft deceleration rate. When the electronic device determines that the current real-time intermediate shaft speed is greater than or equal to the intermediate shaft speed target value, it will obtain the intermediate shaft deceleration rate and the brake-release intermediate shaft deceleration value.

[0095] Step S204: If the intermediate shaft deceleration rate is greater than or equal to the intermediate shaft deceleration value for releasing the brake, the process returns to the step of determining to perform intermediate shaft braking.

[0096] If the intermediate shaft deceleration rate is greater than or equal to the brake-release intermediate shaft deceleration value, it is determined that intermediate shaft braking can be performed.

[0097] Step S206 : If the intermediate shaft deceleration rate is less than the brake-release intermediate shaft deceleration value, it is determined whether the closing time of the intermediate shaft brake solenoid valve is greater than the intermediate shaft brake release time determination value.

[0098] If the intermediate shaft deceleration rate is less than the intermediate deceleration value of the brake release, the intermediate shaft brake current is determined.

[0099] The difference between the solenoid valve closing time and the intermediate shaft brake release time judgment value determines whether to keep the intermediate shaft solenoid valve closed or reopen the intermediate shaft solenoid valve to perform intermediate shaft braking.

[0100] Step S208: When the closing time of the intermediate shaft brake solenoid valve is less than the intermediate shaft brake release time determination value, the process returns to the step of determining to release the intermediate shaft brake.

[0101] Among them, when the closing time of the intermediate shaft brake solenoid valve is less than or equal to the intermediate shaft brake release time judgment value, it means that the closing time of the brake solenoid valve has not reached the release time judgment value, then the intermediate shaft solenoid valve is kept closed, which can avoid opening the intermediate shaft solenoid valve multiple times.

[0102] Furthermore, if the intermediate shaft brake solenoid valve is closed for a time greater than or equal to the intermediate shaft brake release time judgment value, the electronic device will control the opening of the intermediate shaft solenoid valve, which can solve the problem that the intermediate shaft speed does not reach the speed control target value and ensure that gear shifting can be achieved.

[0103] In the above embodiment, when the current real-time intermediate shaft speed is greater than or equal to the intermediate shaft speed control target, it indicates that the speed range for gear shifting has not yet been reached. The electronic device then comprehensively considers whether to keep the intermediate shaft solenoid valve closed or reopen the intermediate shaft solenoid valve by combining the intermediate shaft deceleration rate, the brake release intermediate shaft deceleration value, the intermediate shaft brake solenoid valve closing time, the intermediate shaft brake release time judgment value, etc., thereby preventing over-braking and premature brake release problems from occurring.

[0104] In one embodiment, Figure 3 FIG. 1 is a flow chart of a method for controlling an intermediate shaft brake in one embodiment, which specifically includes the following steps:

[0105] Step 1: Obtain the initial intermediate shaft speed, the initial transmission oil temperature, and the initial intermediate shaft brake air supply pressure at the start of intermediate shaft braking.

[0106] Step 2: Determine the required time for establishing the maximum intermediate shaft braking capacity according to the initial transmission oil temperature and the initial air supply pressure of the intermediate shaft brake at the start time of the intermediate shaft braking.

[0107] Step 3: Open the intermediate shaft brake solenoid valve to brake the intermediate shaft.

[0108] Step 4: Subtract the intermediate shaft speed control target value from the current intermediate shaft speed to obtain the subsequent intermediate shaft speed reduction target value.

[0109] Step 5: Record the opening time of the intermediate shaft brake solenoid valve and determine whether the opening time of the intermediate shaft brake solenoid valve is less than the required time for establishing the maximum intermediate shaft braking capacity; if so, proceed to step 6; if not, proceed to step 16.

[0110] Step 6: Subtract the current intermediate shaft speed from the initial intermediate shaft speed at the time when intermediate shaft braking starts to obtain the current intermediate shaft deceleration value.

[0111] Step 7: Determine the overall intermediate shaft deceleration value based on the initial transmission oil temperature at the start of intermediate shaft braking, the initial air supply pressure of the intermediate shaft brake at the start of intermediate shaft braking, and the real-time braking duration of the intermediate shaft brake solenoid valve.

[0112] Step 8: Subtract the overall intermediate shaft speed reduction value from the current intermediate shaft speed reduction value to obtain an estimated value of the subsequent intermediate shaft speed reduction.

[0113] Step 9: Determine whether the subsequent intermediate shaft speed reduction estimated value is not less than the subsequent intermediate shaft speed reduction target value. If so, proceed to step 10; if not, proceed to step 3.

[0114] Step 10: Close the intermediate shaft brake solenoid valve to release the intermediate shaft brake.

[0115] Step 11: Determine the intermediate shaft brake release time judgment value based on the intermediate shaft brake solenoid valve opening time target value and the transmission oil temperature.

[0116] Step 12: Determine the intermediate shaft deceleration rate based on the intermediate shaft speed and the transmission oil temperature to release the intermediate shaft brake.

[0117] Step 13: Determine whether the intermediate shaft speed is not higher than the intermediate shaft speed control target value. If so, intermediate shaft braking is completed; if not, proceed to step 14.

[0118] Step 14: Determine whether the intermediate shaft deceleration rate is not higher than the intermediate shaft brake release determination intermediate shaft deceleration rate. If so, proceed to step 15; if not, proceed to step 10.

[0119] Step 15: Determine whether the closing time of the intermediate shaft brake solenoid valve is greater than the intermediate shaft brake release time judgment value. If so, proceed to step 1; if not, proceed to step 10.

[0120] Step 16: Determine the intermediate shaft deceleration value for releasing the intermediate shaft brake according to the real-time transmission oil temperature and the intermediate shaft deceleration rate.

[0121] Step 17: Determine whether the intermediate shaft deceleration value after the intermediate shaft brake is released is not less than the subsequent intermediate shaft deceleration target value. If so, proceed to step 10; if not, proceed to step 3.

[0122] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0123] Based on the same inventive concept, embodiments of the present application further provide an intermediate shaft brake control device for implementing the aforementioned intermediate shaft brake control method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more intermediate shaft brake control device embodiments provided below can be found in the aforementioned limitations of the intermediate shaft brake control method and are not further elaborated here.

[0124] In one embodiment, Figure 4 As shown, a control device for an intermediate shaft brake is provided, comprising: a control module, a data acquisition module, a comparison module, a first processing module and a second processing module, wherein:

[0125] The control module 402 is used to open the intermediate shaft solenoid valve to brake the intermediate shaft;

[0126] The data acquisition module 404 is used to obtain the real-time braking duration during the intermediate shaft braking process, where the real-time braking duration is the duration from the intermediate shaft solenoid valve being turned on to the current braking process;

[0127] A comparison module 406 is used to obtain the braking requirement time and compare the real-time braking time with the braking requirement time;

[0128] A first processing module 408 is configured to determine whether to release the intermediate shaft braking according to a nonlinear braking strategy if the real-time braking duration is less than the required braking duration;

[0129] The second processing module 410 is configured to determine whether to release the braking of the intermediate shaft according to a linear braking strategy if the real-time braking duration is greater than or equal to the required braking duration.

[0130] In one embodiment, the comparison module is further configured to obtain an initial air supply pressure and an initial transmission oil temperature when intermediate shaft braking begins; and determine the braking requirement duration by looking up a table based on the initial air supply pressure and the initial transmission oil temperature.

[0131] In one embodiment, the first processing module is further used to obtain a subsequent intermediate shaft deceleration target value, a current real-time intermediate shaft speed, and an initial intermediate shaft speed; to obtain a current intermediate shaft deceleration value by subtracting the current real-time intermediate shaft speed from the initial intermediate shaft speed; to determine an overall intermediate shaft deceleration value based on an initial transmission oil temperature, an initial air supply pressure, and a real-time braking duration; and to determine whether to release the intermediate shaft brake based on the subsequent intermediate shaft deceleration target value, the current intermediate shaft deceleration value, and the overall intermediate shaft deceleration value.

[0132] In one embodiment, the first processing module is further used to determine the estimated value of the subsequent intermediate shaft speed reduction by subtracting the overall intermediate shaft speed reduction value from the current intermediate shaft speed reduction value; if the estimated value of the subsequent intermediate shaft speed reduction is greater than or equal to the subsequent intermediate shaft speed reduction target value, it is determined that the intermediate shaft is released from braking; if the estimated value of the subsequent intermediate shaft speed reduction is less than the subsequent intermediate shaft speed reduction target value, it is returned to execute the step of opening the intermediate shaft solenoid valve and performing intermediate shaft braking.

[0133] In one embodiment, the second processing module is also used to obtain the real-time transmission oil temperature, the intermediate shaft deceleration rate and the subsequent intermediate shaft deceleration target value; based on the real-time transmission oil temperature and the intermediate shaft deceleration rate, the brake-release intermediate shaft deceleration value is determined; if the brake-release intermediate shaft deceleration value is greater than or equal to the subsequent intermediate shaft deceleration target value, it is determined that the intermediate shaft is braked; if the brake-release intermediate shaft deceleration value is less than the subsequent intermediate shaft deceleration target value, it returns to execute the step of opening the intermediate shaft solenoid valve and performing intermediate shaft braking.

[0134] In one embodiment, the second processing module is further configured to obtain a current real-time intermediate shaft speed and an intermediate shaft speed control target value; if the current real-time intermediate shaft speed is less than the intermediate shaft speed control target value, the intermediate shaft solenoid valve is kept closed.

[0135] In one embodiment, the apparatus further comprises: a third processing module;

[0136] The third processing module is used to obtain the intermediate shaft deceleration rate and the brake-release intermediate shaft deceleration value if the current real-time intermediate shaft speed is greater than or equal to the intermediate shaft speed control target value; if the intermediate shaft deceleration rate is greater than or equal to the brake-release intermediate shaft deceleration value, return to the step of determining whether to release the brake on the intermediate shaft; if the intermediate shaft deceleration rate is less than the brake-release intermediate shaft deceleration value, determine whether the closing time of the intermediate shaft brake solenoid valve is greater than the intermediate shaft brake release time judgment value; when the closing time of the intermediate shaft brake solenoid valve is less than the intermediate shaft brake release time judgment value, return to the step of determining whether to release the brake on the intermediate shaft.

[0137] Each module in the aforementioned intermediate shaft brake control device may be implemented in whole or in part via software, hardware, or a combination thereof. Each module may be embedded in or independent of a processor within an electronic device as hardware, or may be stored in a memory within the electronic device as software, allowing the processor to call and execute the corresponding operations of each module.

[0138] In one embodiment, an electronic device is provided. The electronic device may be a vehicle-mounted terminal, and its internal structure diagram may be as follows: Figure 4 As shown. The electronic device includes a processor, memory, a communication interface, a display, and an input device connected via a system bus. The processor of the electronic device is used to provide computing and control capabilities, and the processor includes a vehicle controller. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The communication interface of the electronic device is used to communicate with an external terminal via wired or wireless communication. The wireless communication can be achieved via Wi-Fi, a mobile cellular network, NFC (near-field communication), or other technologies. When executed by the processor, the computer program implements a method for controlling an intermediate shaft brake. The display unit of the electronic device is used to form a visually visible image and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display or an electronic ink display. The input device of the electronic device can be a touch layer covering the display screen, or keys, a trackball, or a touchpad provided on the electronic device housing, or an external keyboard, touchpad, or mouse.

[0139] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the electronic device to which the solution of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0140] In one embodiment, an electronic device is provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps of the above-mentioned intermediate shaft brake control method when executing the computer program.

[0141] In one embodiment, a computer-readable storage medium is provided, storing a computer program thereon. When the computer program is executed by a processor, the computer program implements the steps of the intermediate shaft brake control method. In one embodiment, a computer program product is provided, including the computer program. When the computer program is executed by a processor, the computer program implements the steps of the intermediate shaft brake control method.

[0142] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions.

[0143] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processor involved in the various embodiments provided herein may be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, etc., but are not limited to these.

[0144] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0145] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for controlling an intermediate shaft brake, characterized in that: The method comprises: Open the intermediate shaft solenoid valve to brake the intermediate shaft; Acquire the real-time braking duration during the intermediate shaft braking process, where the real-time braking duration is the duration from the intermediate shaft solenoid valve being turned on to the current braking process; Obtaining a braking requirement duration, and comparing the real-time braking duration with the braking requirement duration; If the real-time braking duration is less than the required braking duration, determining whether to release the intermediate shaft braking according to the nonlinear braking strategy; If the real-time braking duration is greater than or equal to the required braking duration, determining whether to release the intermediate shaft braking according to a linear braking strategy; The determining whether to release the intermediate shaft braking according to the nonlinear braking strategy includes: Obtain the subsequent intermediate shaft speed reduction target value, the current real-time intermediate shaft speed, and the initial intermediate shaft speed; Subtracting the current real-time intermediate shaft speed from the initial intermediate shaft speed to obtain a current intermediate shaft speed reduction value; determining an overall intermediate shaft deceleration value based on an initial transmission oil temperature, an initial air supply pressure, and the real-time braking duration; Whether to release the intermediate shaft brake is determined according to the subsequent intermediate shaft speed reduction target value, the current intermediate shaft speed reduction value, and the overall intermediate shaft speed reduction value.

2. The method according to claim 1, characterized in that The obtaining of the braking requirement duration includes: Obtaining the initial air supply pressure and initial transmission oil temperature when intermediate shaft braking begins; The braking requirement duration is determined by looking up a table based on the initial air supply pressure and the initial transmission oil temperature.

3. The method according to claim 1, characterized in that The determining whether to release the intermediate shaft brake according to the subsequent intermediate shaft speed reduction target value, the current intermediate shaft speed reduction value, and the overall intermediate shaft speed reduction value includes: Subtracting the overall intermediate shaft speed reduction value from the current intermediate shaft speed reduction value to determine a subsequent intermediate shaft speed reduction estimate; If the subsequent intermediate shaft speed reduction estimated value is greater than or equal to the subsequent intermediate shaft speed reduction target value, determining to release the intermediate shaft brake; If the subsequent intermediate shaft speed reduction estimated value is less than the subsequent intermediate shaft speed reduction target value, the process returns to the step of opening the intermediate shaft solenoid valve to perform intermediate shaft braking.

4. The method according to claim 1, wherein Determining whether to release the intermediate shaft from braking according to a linear braking strategy includes: Obtaining real-time transmission oil temperature, intermediate shaft deceleration rate, and subsequent intermediate shaft deceleration target value; Determining a brake-release intermediate shaft deceleration value based on the real-time transmission oil temperature and the intermediate shaft deceleration rate; If the intermediate shaft deceleration value for releasing the brake is greater than or equal to the subsequent intermediate shaft deceleration target value, determining to release the brake on the intermediate shaft; If the brake-released intermediate shaft deceleration value is smaller than the subsequent intermediate shaft deceleration target value, the process returns to the step of opening the intermediate shaft solenoid valve to brake the intermediate shaft.

5. The method according to claim 3 or 4, characterized in that After determining to release the intermediate shaft brake, the method further includes: Obtain the current real-time intermediate shaft speed and intermediate shaft speed control target value; If the current real-time intermediate shaft speed is less than the intermediate shaft speed control target value, the intermediate shaft solenoid valve is kept closed.

6. The method according to claim 5, characterized in that The method further comprises: If the current real-time intermediate shaft speed is greater than or equal to the intermediate shaft speed control target value, obtaining the intermediate shaft deceleration rate and the brake-released intermediate shaft deceleration value; If the intermediate shaft deceleration rate is greater than or equal to the brake-releasing intermediate shaft deceleration value, returning to the step of determining to release the intermediate shaft brake; If the intermediate shaft deceleration rate is less than the brake-release intermediate shaft deceleration value, determining whether the intermediate shaft brake solenoid valve closing time is greater than the intermediate shaft brake release time determination value; When the closing time length of the intermediate shaft brake solenoid valve is less than the intermediate shaft brake release time determination value, the process returns to the step of determining to release the intermediate shaft brake.

7. A control device for an intermediate shaft brake, characterized in that: The device comprises: A control module is used to open the intermediate shaft solenoid valve to brake the intermediate shaft; a data acquisition module, configured to acquire a real-time braking duration during the intermediate shaft braking process, wherein the real-time braking duration is the duration from the intermediate shaft solenoid valve being turned on to the current braking process; a comparison module, configured to obtain a braking requirement duration, and compare the real-time braking duration with the braking requirement duration; a first processing module, configured to determine whether to release the intermediate shaft braking according to a first braking strategy (nonlinear braking strategy) if the real-time braking duration is less than the required braking duration; a second processing module, configured to determine whether to release the braking of the intermediate shaft according to a second braking strategy, i.e., a linear braking strategy, if the real-time braking duration is greater than or equal to the required braking duration; The first processing module is also used to obtain the subsequent intermediate shaft deceleration target value, the current real-time intermediate shaft speed and the initial intermediate shaft speed; subtract the current real-time intermediate shaft speed from the initial intermediate shaft speed to obtain the current intermediate shaft deceleration value; determine the overall intermediate shaft deceleration value based on the initial transmission oil temperature, the initial air supply pressure and the real-time braking duration; determine whether to release the intermediate shaft brake based on the subsequent intermediate shaft deceleration target value, the current intermediate shaft deceleration value and the overall intermediate shaft deceleration value.

8. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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