Intermediate shaft brake control method and device, computer equipment and storage medium

Abstract

The invention relates to an intermediate shaft brake control method and device, computer equipment and a storage medium. The method comprises the following steps: determining a torque build-up speed drop value in a torque build-up response stage according to a first intermediate shaft speed drop change rate in an initial stage of a brake and a second intermediate shaft speed drop change rate in an opening stage of the brake; determining a release rotating speed decline value corresponding to a brake release stage and a release rotating speed decline value corresponding to a brake complete release stage; according to the initial rotating speed, the target rotating speed, the twisting speed drop-out value, the releasing rotating speed drop-out value and the releasing rotating speed drop-out value of the intermediate shaft, the theoretical braking rotating speed difference in the maximum braking speed reduction stage is determined; and the brake is controlled according to the theoretical braking rotating speed difference, the actually-measured braking rotating speed difference in the braking maximum speed reduction stage and the target time array. According to the method, multiple factors are considered, the intermediate shaft brake is controlled, the control accuracy and reasonability of the intermediate shaft brake can be improved, and then the gear shifting fluency and the vehicle driving comfort are improved.

Description

Technical Field

[0001] The present application relates to the technical field of automatic transmission control, and in particular to an intermediate shaft brake control method, device, computer equipment, storage medium and computer program product. Background Art

[0002] In modern automatic mechanical transmissions, such as the Automated Manual Transmission (AMT), the coordination and control of gear shifting operations are crucial and directly affect the vehicle's power, economy and driving comfort. Sliding sleeve shifting technology has been widely used in automatic mechanical transmissions, aiming to ensure the smoothness and accuracy of the gear shifting process through dynamic adjustments such as effective engine torque reduction, clutch disengagement and gear shifting. During the gear shifting process, strict control of the gear shift speed difference is the key to reducing gear shift noise and shock, which requires precise coordination of many parameters, especially the preset speed reduction value of the intermediate shaft and the gear shift loss time.

[0003] The function of the intermediate shaft brake is to lock and quickly reduce the speed of the intermediate shaft during the gear shifting process, and quickly adjust the intermediate shaft speed to the predetermined gear target speed to enhance the smoothness and response speed of the gear shifting. The intermediate shaft brake is controlled by pneumatic control. Due to the strong time lag of pneumatic control, when the intermediate shaft brake control is unreasonable, it will cause the braking time to be too long or over-braking, which will affect the gear shifting effect and the driving experience of the vehicle. Therefore, it is necessary to reasonably control the intermediate shaft brake.

[0004] In the conventional technology, the intermediate shaft brake is controlled based on the energy consumption data of the intermediate shaft brake and the target intermediate shaft speed.

[0005] However, in the traditional method, when controlling the intermediate shaft brake, the factors considered are relatively single, which may lead to inaccurate control of the intermediate shaft brake and over-braking, thereby causing problems such as gear top shifting and excessive gear shifting time. Summary of the invention

[0006] Based on this, it is necessary to provide an intermediate shaft brake control method, device, computer equipment, storage medium and computer program product that comprehensively considers multiple factors to improve the accuracy and rationality of intermediate shaft brake control in response to the above technical problems.

[0007] In a first aspect, the present application provides an intermediate shaft brake control method, comprising:

[0008] Determine the torque building speed reduction value in the torque building response phase according to the speed reduction change rate of the first intermediate shaft in the initial phase of the brake and the speed reduction change rate of the second intermediate shaft in the brake opening phase;

[0009] Determine a release speed drop value corresponding to a brake release stage and a release speed drop value corresponding to a brake complete release stage;

[0010] Obtaining an initial speed and a target speed of the intermediate shaft, and determining a theoretical braking speed difference in a maximum braking speed reduction stage according to the initial speed, the target speed, the torque creation speed reduction value, the release speed reduction value, and the release speed reduction value;

[0011] The brake is controlled according to the theoretical braking speed difference, the actually measured braking speed difference in the maximum deceleration stage of braking, and the target time array.

[0012] In one embodiment, controlling the brake according to the theoretical braking speed difference, the measured braking speed difference in the maximum deceleration stage of braking, and the target time array includes:

[0013] Determine the complete brake release time according to the target time array;

[0014] When the measured braking speed difference is greater than the theoretical braking speed difference, the complete braking release time is compared with the braking release time threshold;

[0015] When the complete brake release time is greater than the brake release time threshold, the brake is controlled to complete the braking.

[0016] In one embodiment, determining the release speed drop value corresponding to the brake release stage and the release speed drop value corresponding to the brake complete release stage includes:

[0017] Determine the time data corresponding to the brake release phase and the time data corresponding to the brake complete release phase according to the target time array;

[0018] Acquire a first intermediate shaft speed value corresponding to a brake release phase and a second intermediate shaft speed value corresponding to a brake complete release phase;

[0019] According to the first intermediate shaft speed value and the time data corresponding to the brake release stage, the release speed drop value corresponding to the brake release stage is determined; according to the first intermediate shaft speed value and the time data corresponding to the brake complete release stage, the release speed drop value corresponding to the brake complete release stage is determined.

[0020] In one embodiment, the method further comprises:

[0021] When the measured braking speed difference is less than or equal to the theoretical braking speed difference, the release speed drop value corresponding to the brake release stage and the release speed drop value corresponding to the brake complete release stage are determined again to obtain an updated release speed drop value and an updated release speed drop value;

[0022] Determine the updated theoretical braking speed difference in the maximum braking speed reduction stage according to the initial speed, the target speed, the torque-building speed reduction value, the updated release speed reduction value and the updated release speed reduction value, and obtain the updated theoretical braking speed difference;

[0023] When the measured braking speed difference is greater than the updated theoretical braking speed difference, the complete braking release time is compared with the braking release time threshold;

[0024] When the complete brake release time is greater than the brake release time threshold, the brake is controlled to complete braking.

[0025] In one embodiment, before determining the torque building speed reduction value in the torque building response phase according to the first intermediate shaft speed reduction change rate in the brake initial phase and the second intermediate shaft speed reduction change rate in the brake opening phase, the method further includes:

[0026] Acquire the first transmission oil temperature and the first air pressure data at the initial moment of the brake, and determine the initial inflation time array according to the first transmission oil temperature, the first air pressure data and the target speed;

[0027] The second transmission oil temperature and the second air pressure data in the initial stage of the brake are obtained, and the initial inflation time array is updated according to the second transmission oil temperature, the second air pressure data and the target speed change rate to obtain the target time array.

[0028] In one embodiment, the method further comprises:

[0029] Determine the intermediate shaft speed change rate compensation value according to the speed ratio data of the transmission and the output shaft speed data corresponding to the initial stage;

[0030] Determine a reference value of the intermediate shaft speed change rate according to the transmission target gear data and slip data;

[0031] The intermediate shaft speed change rate compensation value and the intermediate shaft speed change rate reference value are processed by operation to obtain a target speed change rate.

[0032] In a second aspect, the present application further provides an intermediate shaft brake control device, comprising:

[0033] A first determination module is used to determine a torque building speed reduction value in a torque building response phase according to a first intermediate shaft speed reduction change rate in an initial brake phase and a second intermediate shaft speed reduction change rate in a brake opening phase;

[0034] The second determination module is used to determine a release speed drop value corresponding to the brake release stage and a release speed drop value corresponding to the brake complete release stage;

[0035] The speed difference determination module is used to obtain the initial speed and target speed of the intermediate shaft, and determine the theoretical braking speed difference in the maximum braking speed reduction stage according to the initial speed, the target speed, the torque creation speed reduction value, the release speed reduction value and the release speed reduction value;

[0036] The control module controls the brake according to a theoretical braking speed difference, a measured braking speed difference in a maximum deceleration stage of braking, and a target time array.

[0037] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0038] Determine the torque building speed reduction value in the torque building response phase according to the speed reduction change rate of the first intermediate shaft in the initial phase of the brake and the speed reduction change rate of the second intermediate shaft in the brake opening phase;

[0039] Determine a release speed drop value corresponding to a brake release stage and a release speed drop value corresponding to a brake complete release stage;

[0040] Obtaining an initial speed and a target speed of the intermediate shaft, and determining a theoretical braking speed difference in a maximum braking speed reduction stage according to the initial speed, the target speed, the torque creation speed reduction value, the release speed reduction value, and the release speed reduction value;

[0041] The brake is controlled according to the theoretical braking speed difference, the measured braking speed difference in the maximum deceleration stage of braking, and the target time array.

[0042] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the following steps are implemented:

[0043] Determine the torque building speed reduction value in the torque building response phase according to the speed reduction change rate of the first intermediate shaft in the initial phase of the brake and the speed reduction change rate of the second intermediate shaft in the brake opening phase;

[0044] Determine a release speed drop value corresponding to a brake release stage and a release speed drop value corresponding to a brake complete release stage;

[0045] Obtaining an initial speed and a target speed of the intermediate shaft, and determining a theoretical braking speed difference in a maximum braking speed reduction stage according to the initial speed, the target speed, the torque creation speed reduction value, the release speed reduction value, and the release speed reduction value;

[0046] The brake is controlled according to the theoretical braking speed difference, the measured braking speed difference in the maximum deceleration stage of braking, and the target time array.

[0047] In a fifth aspect, the present application further provides a computer program product, including a computer program, which implements the following steps when executed by a processor:

[0048] Determine the torque building speed reduction value in the torque building response phase according to the speed reduction change rate of the first intermediate shaft in the initial phase of the brake and the speed reduction change rate of the second intermediate shaft in the brake opening phase;

[0049] Determine a release speed drop value corresponding to a brake release stage and a release speed drop value corresponding to a brake complete release stage;

[0050] Obtaining an initial speed and a target speed of the intermediate shaft, and determining a theoretical braking speed difference in a maximum braking speed reduction stage according to the initial speed, the target speed, the torque creation speed reduction value, the release speed reduction value, and the release speed reduction value;

[0051] The brake is controlled according to the theoretical braking speed difference, the actually measured braking speed difference in the maximum deceleration stage of braking, and the target time array.

[0052] The above intermediate shaft brake control method, device, computer equipment, storage medium and computer program product determine the torque response phase torque response speed reduction value according to the first intermediate shaft speed reduction change rate in the initial stage of the brake and the second intermediate shaft speed reduction change rate in the brake opening stage; determine the release speed reduction value corresponding to the brake release stage and the release speed reduction value corresponding to the brake complete release stage; obtain the initial speed and target speed of the intermediate shaft, and determine the theoretical braking speed difference in the maximum braking speed reduction stage according to the initial speed, target speed, torque reduction value, release speed reduction value and release speed reduction value; control the brake according to the theoretical braking speed difference, the measured braking speed difference in the maximum braking speed reduction stage and the target time array. The intermediate shaft brake control method comprehensively considers multiple stages of brake braking and takes multiple factors into consideration to control the intermediate shaft brake, which can improve the accuracy and rationality of intermediate shaft brake control, thereby improving the smoothness of gear shifting and the comfort of vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0054] FIG1 is an application environment diagram of a method for controlling an intermediate shaft brake in one embodiment;

[0055] FIG2 is a schematic flow chart of a method for controlling an intermediate shaft brake in one embodiment;

[0056] FIG3 is a schematic flow chart of a step of determining a value for releasing a speed drop in one embodiment;

[0057] FIG4 is a schematic flow chart of a method for controlling an intermediate shaft brake in another embodiment;

[0058] FIG5 is a block diagram of a structure of an intermediate shaft brake control device in one embodiment;

[0059] FIG. 6 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0061] The intermediate shaft brake control method provided in the embodiment of the present application can be applied in the application environment shown in FIG. 1 . The terminal 102 communicates with the server 104 through the network. The data storage system can store the data that the server 104 needs to process. The data storage system can be integrated on the server 104, or placed on the cloud or other network servers. The terminal 102 sends an intermediate shaft brake control request to the server 104, and the server 104 receives the intermediate shaft brake control request, and determines the torque response phase according to the first intermediate shaft deceleration change rate in the initial stage of the brake and the second intermediate shaft deceleration change rate in the brake opening stage. The torque response phase is determined; the release speed drop value corresponding to the brake release phase and the release speed drop value corresponding to the brake complete release phase are determined; and the theoretical braking speed difference in the maximum braking speed drop phase is determined according to the initial speed, target speed, torque speed drop value, release speed drop value and release speed drop value of the intermediate shaft; the brake is controlled according to the theoretical braking speed difference, the measured braking speed difference in the maximum braking speed drop phase and the target time array. The terminal 102 can be, but is not limited to, various vehicles such as automobiles, motorcycles, and aircraft. The server 104 may be implemented as an independent server or a server cluster consisting of multiple servers.

[0062] In an exemplary embodiment, as shown in FIG2 , a method for controlling an intermediate shaft brake is provided, which is described by taking the method applied to the server in FIG1 as an example, and includes the following steps 202 to 208 . Among them:

[0063] Step 202: Determine the torque building speed reduction value in the torque building response phase according to the first intermediate shaft speed reduction change rate in the brake initial phase and the second intermediate shaft speed reduction change rate in the brake opening phase.

[0064] Among them, the initial stage of the brake refers to the period after the clutch is completely separated and before the intermediate shaft brake is turned on. The first intermediate shaft deceleration rate refers to the rate at which the intermediate shaft speed decreases after the clutch is separated and no braking force is applied (before the intermediate shaft brake is turned on). The first intermediate shaft deceleration rate is the natural deceleration capacity of the intermediate shaft when it is not affected by the brake. The brake opening stage refers to the period after the intermediate shaft brake is turned on. The second intermediate shaft deceleration rate refers to the rate at which the intermediate shaft speed decreases after the intermediate shaft brake is turned on. The second intermediate shaft deceleration rate is affected by the braking strength of the brake. The torque response stage refers to the period from the opening of the intermediate shaft brake to the establishment of the maximum braking capacity.

[0065] Exemplarily, in an operating state where the clutch is disengaged and the brake has not yet been applied, the intermediate shaft free deceleration rate value is calculated by obtaining the intermediate shaft speed value in the first few cycles before the intermediate shaft brake is turned on, and the first intermediate shaft deceleration change rate is obtained. The intermediate shaft speed value after the intermediate shaft brake is turned on is obtained, and the intermediate shaft speed value refers to the actual speed of the intermediate shaft after the brake is turned on. The second intermediate shaft deceleration change rate refers to the rate at which the intermediate shaft speed value changes with time after the brake is turned on (brake on stage), and the second intermediate shaft deceleration change rate can be obtained by the first intermediate shaft deceleration change rate in the initial stage of the brake and the intermediate shaft speed value in the brake on stage.

[0066] According to the first intermediate shaft deceleration rate and the second intermediate shaft deceleration rate, the torque building speed reduction value in the torque building response stage is determined. Exemplarily, the intermediate shaft speed value of the last cycle of the initial stage of the brake is determined according to the first intermediate shaft deceleration rate, and the intermediate shaft speed value of the last cycle of the initial stage is recorded as the intermediate shaft speed value at the start of the brake. According to the intermediate shaft speed value at the start of the brake and the intermediate shaft speed value in the brake opening stage, the second intermediate shaft deceleration rate is determined. The torque building response time consumed in the stage of establishing the maximum braking capacity is obtained, and the intermediate shaft speed value decreased in the stage of establishing the maximum braking capacity is determined according to the torque building response time and the second intermediate shaft deceleration rate, that is, the torque building speed reduction value in the torque building response stage is determined.

[0067] Step 204 , determining a release speed drop value corresponding to the brake release phase and a release speed drop value corresponding to the brake complete release phase.

[0068] The brake release stage refers to the stage when the intermediate shaft brake is released. Optionally, the intermediate shaft brake release stage can be the time period from the closing moment of the intermediate shaft brake intake valve to the moment when the intermediate shaft brake is completely released. The brake complete release stage refers to the delay period after the intermediate shaft brake is completely released. It can be the time period from the moment when the intermediate shaft brake is completely released to the target delay time, and the target delay time is set according to actual conditions.

[0069] Exemplarily, according to the intermediate shaft speed values ​​corresponding to the brake release phase and the brake complete release phase, a release speed drop value corresponding to the brake release phase and a release speed drop value corresponding to the brake complete release phase are calculated.

[0070] Step 206, obtaining the initial speed and target speed of the intermediate shaft, and determining the theoretical braking speed difference in the maximum braking deceleration stage according to the initial speed, target speed, torque creation speed reduction value, release speed reduction value and release speed reduction value.

[0071] The target speed refers to the ideal speed of the intermediate shaft after the brake has completed braking the intermediate shaft, which is set according to the actual situation. The initial speed of the intermediate shaft refers to the speed of the intermediate shaft at the initial moment of the intermediate shaft brake. The maximum deceleration stage of braking refers to the stage in which the speed of the intermediate shaft is greatly reduced after the torque response stage (after the maximum braking capacity is established).

[0072] Exemplarily, the theoretical braking speed difference of the maximum braking deceleration stage is determined according to the initial speed, target speed, torque speed drop value, release speed drop value and release speed drop value. The initial speed, target speed, torque speed drop value, release speed drop value and release speed drop value can be processed by operation to obtain the theoretical braking speed difference of the maximum braking deceleration stage. For example, the target speed drop value that can be reduced to the intermediate shaft is determined according to the difference between the initial speed and the target speed; the torque speed drop value, release speed drop value and release speed drop value are summed to obtain the sum of the speed drop values ​​of the remaining stages; the target speed drop value that can be reduced to the intermediate shaft and the sum of the speed drop values ​​of the remaining stages are subtracted to obtain the theoretical braking speed difference of the maximum braking deceleration stage.

[0073] Step 208: Control the brake according to the theoretical braking speed difference, the actually measured braking speed difference in the maximum braking deceleration stage, and the target time array.

[0074] The measured braking speed difference in the maximum deceleration phase of braking refers to the braking speed difference actually measured in the maximum deceleration phase of braking. Exemplarily, the measured braking speed difference in the maximum deceleration phase of braking is determined according to the actually measured intermediate shaft speed value at the start time of the maximum deceleration phase and the actually measured intermediate shaft speed value at the end time of the maximum deceleration phase.

[0075] Optionally, it is determined whether to terminate the control of the intermediate shaft brake based on the theoretical braking speed difference, the actually measured braking speed difference in the maximum braking deceleration stage, and the target time array.

[0076] In the above intermediate shaft brake control method, the release speed drop value corresponding to the brake release stage, the release speed drop value corresponding to the brake complete release stage, and the target time array are taken into account, so that the intermediate shaft brake can be accurately and reasonably controlled. By calculating the theoretical brake speed difference and the measured brake speed difference, the braking performance of the system can be clearly evaluated, and the theoretical brake speed difference can be compared with the measured brake speed difference to determine whether the measured brake speed difference is the speed difference required to achieve smooth gear shifting, thereby improving the control accuracy of the intermediate shaft brake and thus improving the rationality of the gear shifting timing.

[0077] In an exemplary embodiment, controlling the brake based on the theoretical braking speed difference, the measured braking speed difference in the maximum braking deceleration stage and the target time array includes: determining the complete braking release time based on the target time array; when the measured braking speed difference is greater than the theoretical braking speed difference, comparing the complete braking release time with the braking release time threshold; when the complete braking release time is greater than the braking release time threshold, controlling the brake to complete braking.

[0078] Among them, the target time array is the updated inflation time array of the intermediate shaft brake, which may include time data of the brake initial stage, time data of the brake opening stage, time data of the maximum deceleration stage, time data of the brake complete release stage, etc.

[0079] The measured braking speed difference in the maximum deceleration stage is compared with the theoretical braking speed difference in the maximum deceleration stage. When the measured braking speed difference in the maximum deceleration stage is greater than the theoretical braking speed difference in the maximum deceleration stage, it is determined whether the complete brake release time is greater than the brake release time threshold. If the complete brake release time is greater than the brake release time threshold, the brake is controlled to complete braking. The brake release time threshold is set according to actual conditions.

[0080] In the previous exemplary embodiment, the method also includes: when the measured braking speed difference is less than or equal to the theoretical braking speed difference, re-determining the release speed drop value corresponding to the braking release stage and the release speed drop value corresponding to the braking complete release stage, and obtaining an updated release speed drop value and an updated release speed drop value; determining the updated theoretical braking speed difference in the maximum braking deceleration stage according to the initial speed, the target speed, the torque reduction value, the updated release speed drop value and the updated release speed drop value, and obtaining an updated theoretical braking speed difference; when the measured braking speed difference is greater than the updated theoretical braking speed difference, comparing the complete braking release time with the braking release time threshold; when the complete braking release time is greater than the braking release time threshold, controlling the brake to complete braking.

[0081] The measured braking speed difference in the maximum deceleration stage is compared with the theoretical braking speed difference in the maximum braking deceleration stage. When the measured braking speed difference in the maximum deceleration stage is less than or equal to the theoretical braking speed difference in the maximum braking deceleration stage, the release speed drop value corresponding to the brake release stage and the release speed drop value corresponding to the brake complete release stage are obtained again to obtain an updated release speed drop value and an updated release speed drop value. The theoretical braking speed difference in the maximum braking deceleration stage is updated according to the updated release speed drop value and the updated release speed drop value to obtain an updated theoretical braking speed difference.

[0082] When the measured braking speed difference in the maximum deceleration stage is greater than the updated theoretical braking speed difference, the complete brake release time is compared with the brake release time threshold, otherwise the release speed drop value corresponding to the brake release stage and the release speed drop value corresponding to the brake complete release stage are continuously obtained, and the release speed drop value and the release speed drop value are updated. When the measured braking speed difference in the maximum deceleration stage is greater than the updated theoretical braking speed difference, and the complete brake release time is greater than the brake release time threshold, the brake is controlled to complete braking, and the transmission performs a shift action.

[0083] In an exemplary embodiment, the complete brake release time is determined according to the target time array; when the measured brake speed difference is greater than the theoretical brake speed difference, the complete brake release time is compared with the brake release time threshold; when the complete brake release time is less than or equal to the brake release time threshold, the complete brake release time is reacquired to obtain an updated complete brake release time, and the release speed drop value is re-determined according to the updated complete brake release time. According to the re-determined release speed drop value, the theoretical brake speed difference of the corresponding maximum braking deceleration stage is obtained. When it is determined that the measured brake speed difference of the maximum braking deceleration stage is greater than the theoretical brake speed difference of the maximum braking deceleration stage corresponding to the re-determined release speed drop value, and the updated complete brake release time is greater than the brake release time threshold, the brake is controlled to complete the braking, and the transmission performs the shift action. Otherwise, the complete brake release time is continued to be re-acquired.

[0084] In this embodiment, the measured braking speed difference in the maximum deceleration stage is compared with the theoretical braking speed difference in the maximum deceleration stage of the brake, and the brake is controlled to ensure that the speed change of the intermediate shaft is within the expected range during gear shifting, thereby reducing the impact during gear shifting. By judging whether the complete brake release time exceeds the brake release time threshold, it is ensured that the brake is released at an appropriate time, which can avoid unsmooth gear shifting caused by premature brake release.

[0085] In an exemplary embodiment, as shown in FIG3 , determining the release speed drop value corresponding to the brake release stage and the release speed drop value corresponding to the brake complete release stage includes steps 302 to 306 . Among them:

[0086] Step 302: Determine the time data corresponding to the brake release phase and the time data corresponding to the brake complete release phase according to the target time array.

[0087] Step 304 , obtaining a first intermediate shaft speed value corresponding to the brake release phase and a second intermediate shaft speed value corresponding to the brake complete release phase.

[0088] Step 306, determining the release speed drop value corresponding to the brake release phase according to the first intermediate shaft speed value and the time data corresponding to the brake release phase; determining the release speed drop value corresponding to the brake complete release phase according to the first intermediate shaft speed value and the time data corresponding to the brake complete release phase.

[0089] Exemplarily, when the intermediate shaft brake intake valve is closed, air is prevented from further entering the brake, thereby preventing overpressure, and the exhaust valve is opened at the same time to release the pressure inside the brake. This process indicates that the intermediate shaft brake begins to be released, that is, entering the brake release stage. The intermediate shaft speed value in the brake release stage is obtained, recorded as the first intermediate shaft speed value, and the intermediate shaft speed change rate in the brake release stage is calculated according to the first intermediate shaft speed value corresponding to different moments in the brake release stage. The time data corresponding to the brake release stage is determined according to the target time array, and the time data corresponding to the brake release stage may include the time range value of the brake release stage. The time range value of the brake release stage and the intermediate shaft speed change rate in the brake release stage are processed by operation to obtain the release speed drop value corresponding to the brake release stage.

[0090] The brake completely released stage is the delay period after the intermediate shaft brake is completely released, that is, the time interval between the moment when the intermediate shaft brake is completely released and the moment when the gear shift is ready. The intermediate shaft speed value in the brake completely released stage is obtained and recorded as the second intermediate shaft speed value. The intermediate shaft speed change rate in the brake completely released stage is calculated based on the second intermediate shaft speed values ​​corresponding to different moments in the brake completely released stage. The time data corresponding to the brake completely released stage is determined based on the target time array, and the time data corresponding to the completely released stage may include the time range value of the completely released stage. The time range value of the completely released stage and the intermediate shaft speed change rate in the completely released stage are processed by calculation to obtain the release speed drop value corresponding to the completely released stage.

[0091] In this embodiment, the intermediate shaft speed may also change during the delay period (complete release stage) after the intermediate shaft brake is completely released. Determining the second intermediate shaft speed value in the complete release stage and the intermediate shaft speed change rate in the complete release stage can optimize the control of the intermediate shaft brake and the gear shifting timing, thereby reducing the occurrence of gear shifting noise and gear shifting shock caused by misjudgment of the gear speed difference.

[0092] In an exemplary embodiment, before determining the torque building speed reduction value in the torque building response stage according to the first intermediate shaft speed reduction change rate in the initial stage of the brake and the second intermediate shaft speed reduction change rate in the brake opening stage, it also includes: obtaining the first transmission oil temperature and the first air pressure data at the initial moment of the brake, and determining the initial inflation time array according to the first transmission oil temperature, the first air pressure data and the target speed; obtaining the second transmission oil temperature and the second air pressure data in the initial stage of the brake, and updating the initial inflation time array according to the second transmission oil temperature, the second air pressure data and the target speed change rate to obtain the target time array.

[0093] Exemplarily, the first transmission oil temperature refers to the temperature of the oil inside the transmission corresponding to the start time of the brake, and the first transmission oil temperature can be obtained by monitoring the over-temperature sensor. The first air pressure data refers to the GSU (air pressure monitoring unit) air pressure value corresponding to the start time of the brake. The target speed of the intermediate shaft is determined according to the intermediate shaft speed at the start time of the brake, the current gear of the transmission, the target gear of the transmission, the road slope, the vehicle mass and the running resistance of the vehicle. Then, the initial inflation time array is determined according to the first transmission oil temperature, the first air pressure data and the target speed.

[0094] The temperature of the oil in the transmission and the GSU air pressure value after the clutch is completely separated and before the intermediate shaft brake is inflated (i.e., the initial stage of the brake) in the slope working condition are obtained to obtain the second transmission oil temperature and second air pressure data. The initial inflation time array is updated according to the second transmission oil temperature, the second air pressure data, and the target speed change rate to obtain a new inflation time array for the intermediate shaft brake, i.e., the target time array. Among them, the target speed change rate is related to the speed loss caused by the slope working condition.

[0095] In this embodiment, during the uphill process of the vehicle, the output shaft speed will be affected by the slope, and thus the speed of the intermediate shaft will also be affected, that is, under slope conditions, the vehicle's operating state and power demand may vary greatly. Therefore, the real-time data such as the second transmission oil temperature, the second air pressure data and the target speed change rate obtained after the clutch is completely disengaged under slope conditions (initial stage of the brake) can ensure that the new inflation time array (target time array) of the intermediate shaft brake matches the current vehicle state, thereby ensuring that under different conditions, the intermediate shaft brake can be accurately controlled to achieve smooth gear shifting and effective braking of the vehicle.

[0096] In the previous exemplary embodiment, the method also includes: determining the intermediate shaft speed change rate compensation value based on the speed ratio data of the transmission and the output shaft speed data corresponding to the initial stage; determining the intermediate shaft speed change rate reference value based on the transmission target gear data and slip data; and calculating and processing the intermediate shaft speed change rate compensation value and the intermediate shaft speed change rate reference value to obtain the target speed change rate.

[0097] Among them, the speed ratio data of the transmission includes the target gear ratio of the transmission and the auxiliary box speed ratio before the target gear, and the slip data refers to the dog tooth slip reduction value. Dog tooth slip refers to the amount of slip generated by the relative speed difference when the transmission gear (dog tooth) is engaged during the gear shifting process of the transmission. The dog tooth slip reduction value indicates the degree to which the dog tooth slip is reduced during the gear shifting process. The intermediate shaft speed change rate reference value refers to the speed change rate that the intermediate shaft should reach under specific working conditions.

[0098] For example, when the vehicle is running on a slope or in other special working conditions, the output shaft speed may change, and the change in the output shaft speed will cause the intermediate shaft speed to be insufficient, thereby affecting the shifting performance. In order to compensate for the insufficient intermediate shaft speed caused by the change in the output shaft speed and make the intermediate shaft speed change rate adapt to the current operating conditions, the intermediate shaft speed change rate needs to be compensated to reduce the shifting shock and noise caused by speed mismatch and improve driving comfort.

[0099] Optionally, the output shaft speed value within several cycles after the clutch is completely separated in the slope working condition (i.e., the initial stage of the brake) is obtained, and the intermediate shaft speed value loss caused by the change of the output shaft speed is determined according to the output shaft speed value and the speed ratio data of the transmission. The intermediate shaft speed change rate compensation value is determined according to the determined intermediate shaft speed value loss, such as determining the intermediate shaft speed change rate compensation value according to the intermediate shaft speed value loss and a preset compensation model, or determining the intermediate shaft speed change rate compensation value according to the intermediate shaft speed value loss and a preset compensation coefficient. By determining the intermediate shaft speed change rate compensation value, the shift shock and noise caused by speed mismatch can be reduced, the driving comfort can be improved, and at the same time, it can ensure that the speed of the intermediate shaft is kept within a reasonable range during the intermediate shaft power transmission process, avoiding power loss and improving the overall performance of the vehicle. A relationship between the transmission target gear data and the slip data can be established, and the intermediate shaft speed change rate reference value can be determined according to the relationship.

[0100] In this embodiment, by determining the intermediate shaft speed change rate compensation value, the shift shock and noise caused by speed mismatch can be reduced, driving comfort can be improved, and the speed of the intermediate shaft can be kept within a reasonable range during the intermediate shaft power transmission process, thereby avoiding power loss and improving the overall performance of the vehicle. Furthermore, by dynamically adjusting the target speed change rate in combination with the intermediate shaft speed change rate compensation value and the intermediate shaft speed change rate reference value, the initial inflation time array of the intermediate shaft brake can be further adjusted.

[0101] In another embodiment, as shown in FIG4 , a method for controlling an intermediate shaft brake is provided, the method comprising steps 1 to 13. Wherein:

[0102] Step 1, determine the target speed of the intermediate shaft according to the intermediate shaft speed at the start time of the brake, the current gear of the transmission, the target gear of the transmission, the road slope, the vehicle mass and the vehicle running resistance. Then determine the initial inflation time array according to the first transmission oil temperature, the first air pressure data and the target speed.

[0103] Step 2, determining the intermediate shaft speed change rate compensation value according to the transmission speed ratio data and the output shaft speed data corresponding to the initial stage; determining the intermediate shaft speed change rate reference value according to the transmission target gear data and slip data; and calculating and processing the intermediate shaft speed change rate compensation value and the intermediate shaft speed change rate reference value to obtain the target speed change rate.

[0104] Step 3, obtaining the second transmission oil temperature and the second air pressure data in the initial stage of the brake, and updating the initial inflation time array according to the second transmission oil temperature, the second air pressure data and the target speed change rate to obtain the target time array.

[0105] Step 4, open the intermediate shaft brake intake valve and close the intermediate shaft brake exhaust valve at the same time.

[0106] Step 5: Determine the torque building speed reduction value in the torque building response phase according to the speed reduction change rate of the first intermediate shaft in the initial phase of the brake and the speed reduction change rate of the second intermediate shaft in the brake opening phase.

[0107] Step 6, obtaining a preset stable braking speed difference during the intermediate shaft maximum deceleration rate stage, and decelerating the intermediate shaft.

[0108] Step 7, the intermediate shaft brake intake valve is closed and the exhaust valve is opened.

[0109] Step 8, determine the time data corresponding to the brake release phase according to the target time array, and obtain the first intermediate shaft speed value corresponding to the brake release phase; determine the release speed drop value corresponding to the brake release phase according to the first intermediate shaft speed value and the time data corresponding to the brake release phase.

[0110] Step 9, determine the time data corresponding to the brake complete release stage according to the target time array, and obtain the second intermediate shaft speed value corresponding to the brake complete release stage; determine the release speed drop value corresponding to the brake complete release stage according to the second intermediate shaft speed value and the time data corresponding to the brake complete release stage; wherein, the time data corresponding to the complete release stage includes the complete brake release time T.

[0111] Step 10, determining the theoretical braking speed difference in the maximum braking speed reduction stage according to the initial speed, target speed, torque reduction value, release speed reduction value and release speed reduction value of the intermediate value.

[0112] Step 11, determine whether the measured braking speed difference delta (nmax1) in the maximum braking deceleration stage is greater than the theoretical braking speed difference delta (nmax) in the maximum braking deceleration stage. If delta (nmax1) > delta (nmax), proceed to step 12; if not, proceed to step 7.

[0113] Step 12, determine whether the complete brake release time T is greater than the brake release time threshold T0, if T>T0, proceed to step 13; if not, proceed to step 9.

[0114] Step 13, controlling the brake to complete braking, and the transmission to shift into a gear.

[0115] In this embodiment, during the uphill process of the vehicle, the output shaft speed will be affected by the slope, and thus the intermediate shaft speed will also be affected, that is, under the slope working condition, the vehicle's operating state and power demand may change greatly. Therefore, the real-time data such as the second transmission oil temperature, the second air pressure data and the target speed change rate obtained after the clutch is completely separated (the initial stage of the brake) under the slope working condition can ensure that the intermediate shaft brake new air filling time array (target time array) matches the current vehicle state, thereby ensuring that the intermediate shaft brake can be accurately controlled under different working conditions to achieve smooth gear shifting and effective braking of the vehicle. During the delay period (complete release stage) after the intermediate shaft brake is completely released, the intermediate shaft speed may also change. Determining the second intermediate shaft speed value in the complete release stage and the intermediate shaft speed change rate in the complete release stage can optimize the control of the intermediate shaft brake and the shifting timing, thereby reducing the occurrence of shifting noise and shifting shock caused by misjudgment of the gear speed difference. By comparing the measured braking speed difference in the maximum deceleration stage with the theoretical braking speed difference in the maximum deceleration stage, and controlling the brake, it is possible to ensure that the speed change of the intermediate shaft is within the expected range during gear shifting, thereby reducing the impact during gear shifting. By judging whether the complete brake release time exceeds the brake release time threshold, it is possible to ensure that the brake is released at the appropriate time, thereby avoiding unsmooth gear shifting caused by premature brake release.

[0116] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0117] Based on the same inventive concept, the embodiment of the present application also provides an intermediate shaft brake control device for implementing the intermediate shaft brake control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations of one or more intermediate shaft brake control device embodiments provided below can refer to the limitations of the intermediate shaft brake control method above, and will not be repeated here.

[0118] In an exemplary embodiment, as shown in FIG. 5 , an intermediate shaft brake control device is provided, comprising: a first determination module 502 , a second determination module 504 , a speed difference determination module 506 and a control module 508 , wherein:

[0119] The first determination module 502 is used to determine the torque building speed reduction value in the torque building response phase according to the first intermediate shaft speed reduction change rate in the brake initial phase and the second intermediate shaft speed reduction change rate in the brake opening phase.

[0120] The second determining module 504 is used to determine a release speed reduction value corresponding to the brake release stage and a release speed reduction value corresponding to the brake complete release stage.

[0121] The speed difference determination module 506 is used to obtain the initial speed and target speed of the intermediate shaft, and determine the theoretical braking speed difference in the maximum braking deceleration stage according to the initial speed, target speed, torque reduction value, release speed reduction value and release speed reduction value.

[0122] The control module 508 is used to control the brake according to the theoretical braking speed difference, the actual braking speed difference in the maximum deceleration stage of braking, and the target time array.

[0123] In an exemplary embodiment, the control module 508 is also used to determine the complete brake release time based on the target time array; when the measured braking speed difference is greater than the theoretical braking speed difference, the complete brake release time is compared with the brake release time threshold; when the complete brake release time is greater than the brake release time threshold, the brake is controlled to complete braking.

[0124] In an exemplary embodiment, the second determination module 504 is also used to determine the time data corresponding to the brake release phase and the time data corresponding to the brake complete release phase according to the target time array; obtain the first intermediate shaft speed value corresponding to the brake release phase and the second intermediate shaft speed value corresponding to the brake complete release phase; determine the release speed drop value corresponding to the brake release phase according to the first intermediate shaft speed value and the time data corresponding to the brake release phase; determine the release speed drop value corresponding to the brake complete release phase according to the second intermediate shaft speed value and the time data corresponding to the brake complete release phase.

[0125] In an exemplary embodiment, the control module 508 is also used to, when the measured braking speed difference is less than or equal to the theoretical braking speed difference, re-determine the release speed drop value corresponding to the braking release phase and the release speed drop value corresponding to the braking complete release phase, and obtain an updated release speed drop value and an updated release speed drop value; determine the updated theoretical braking speed difference in the maximum braking deceleration phase according to the initial speed, the target speed, the torque reduction value, the updated release speed drop value and the updated release speed drop value, and obtain an updated theoretical braking speed difference; when the measured braking speed difference is greater than the updated theoretical braking speed difference, compare the complete braking time with the braking time threshold; when the complete braking time is greater than the braking time threshold, control the brake to complete braking.

[0126] In an exemplary embodiment, the intermediate shaft brake control device further comprises:

[0127] The initial inflation time array update module is used to obtain the first transmission oil temperature and the first air pressure data at the initial moment of the brake, and determine the initial inflation time array according to the first transmission oil temperature, the first air pressure data and the target speed; obtain the second transmission oil temperature and the second air pressure data in the initial stage of the brake, and update the initial inflation time array according to the second transmission oil temperature, the second air pressure data and the target speed change rate to obtain the target time array.

[0128] In an exemplary embodiment, the initial inflation time array update module is also used to determine the intermediate shaft speed change rate compensation value based on the transmission speed ratio data and the output shaft speed data corresponding to the initial stage; determine the intermediate shaft speed change rate reference value based on the transmission target gear data and slip data; and calculate and process the intermediate shaft speed change rate compensation value and the intermediate shaft speed change rate reference value to obtain the target speed change rate.

[0129] Each module in the intermediate shaft brake control device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0130] In an exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be shown in FIG6. The computer device includes a processor, a memory, an input / output interface (I / O for short) and a communication interface. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data such as a target time array and a speed change rate of an intermediate shaft. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a method for controlling an intermediate shaft brake is implemented.

[0131] Those skilled in the art will understand that the structure shown in FIG. 6 is merely a block diagram of a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0132] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0133] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0134] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0135] 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 relevant regulations.

[0136] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and 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 the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0137] The technical features of the above embodiments may 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.

[0138] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for controlling an intermediate shaft brake, characterized in that: The method comprises: Determine the torque building speed reduction value in the torque building response phase according to the speed reduction change rate of the first intermediate shaft in the initial phase of the brake and the speed reduction change rate of the second intermediate shaft in the brake opening phase; Determine a release speed drop value corresponding to a brake release stage and a release speed drop value corresponding to a brake complete release stage; Acquire the initial speed and target speed of the intermediate shaft, and determine the theoretical braking speed difference in the maximum braking speed reduction stage according to the initial speed, target speed, torque creation speed reduction value, release speed reduction value and release speed reduction value; The brake is controlled according to the theoretical braking speed difference, the actually measured braking speed difference in the maximum deceleration stage of braking, and the target time array.

2. The method according to claim 1, characterized in that The controlling of the brake according to the theoretical braking speed difference, the measured braking speed difference in the maximum deceleration stage of braking and the target time array comprises: Determine the complete brake release time according to the target time array; When the measured braking speed difference is greater than the theoretical braking speed difference, comparing the complete braking release time with a braking release time threshold; When the complete brake release time is greater than the brake release time threshold, the brake is controlled to complete braking.

3. The method according to claim 2, characterized in that Determining the release speed drop value corresponding to the brake release stage and the release speed drop value corresponding to the brake complete release stage includes: Determine the time data corresponding to the brake release phase and the time data corresponding to the brake complete release phase according to the target time array; Acquire a first intermediate shaft speed value corresponding to the brake release stage and a second intermediate shaft speed value corresponding to the brake complete release stage; According to the first intermediate shaft speed value and the time data corresponding to the brake release stage, the release speed drop value corresponding to the brake release stage is determined; according to the second intermediate shaft speed value and the time data corresponding to the brake complete release stage, the release speed drop value corresponding to the brake complete release stage is determined.

4. The method according to claim 2, characterized in that: The method further comprises: When the measured braking speed difference is less than or equal to the theoretical braking speed difference, the release speed drop value corresponding to the brake release stage and the release speed drop value corresponding to the brake complete release stage are determined again to obtain an updated release speed drop value and an updated release speed drop value; Determine the updated theoretical braking speed difference in the maximum braking speed reduction stage according to the initial speed, the target speed, the torque-building speed reduction value, the updated release speed reduction value and the updated release speed reduction value, and obtain the updated theoretical braking speed difference; When the measured braking speed difference is greater than the updated theoretical braking speed difference, comparing the complete braking release time with the braking release time threshold; When the complete brake release time is greater than the brake release time threshold, the brake is controlled to complete braking.

5. The method according to claim 1, characterized in that: Before determining the torque building speed reduction value in the torque building response phase according to the first intermediate shaft speed reduction change rate in the brake initial phase and the second intermediate shaft speed reduction change rate in the brake opening phase, the method further includes: Acquire the first transmission oil temperature and the first air pressure data at the initial moment of the brake, and determine the initial inflation time array according to the first transmission oil temperature, the first air pressure data and the target speed; The second transmission oil temperature and the second air pressure data in the initial stage of the brake are obtained, and the initial inflation time array is updated according to the second transmission oil temperature, the second air pressure data and the target speed change rate to obtain a target time array.

6. The method according to claim 5, characterized in that The method further comprises: Determining a compensation value for the intermediate shaft speed change rate according to the speed ratio data of the transmission and the output shaft speed data corresponding to the initial stage; Determine a reference value of the intermediate shaft speed change rate according to the transmission target gear data and slip data; The intermediate shaft speed change rate compensation value and the intermediate shaft speed change rate reference value are processed by operation to obtain the target speed change rate.

7. An intermediate shaft brake control device, characterized in that: The device comprises: A first determination module is used to determine a torque building speed reduction value in a torque building response phase according to a first intermediate shaft speed reduction change rate in an initial brake phase and a second intermediate shaft speed reduction change rate in a brake opening phase; The second determination module is used to determine a release speed drop value corresponding to the brake release stage and a release speed drop value corresponding to the brake complete release stage; A speed difference determination module is used to obtain an initial speed and a target speed of the intermediate shaft, and determine a theoretical braking speed difference in a maximum braking speed reduction stage according to the initial speed, the target speed, the torque creation speed reduction value, the release speed reduction value and the release speed reduction value; The control module controls the brake according to the theoretical braking speed difference, the actually measured braking speed difference in the maximum deceleration stage of braking, and the target time array.

8. A computer 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.

10. A computer program product, comprising a computer program, 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.

Images