Intermediate shaft brake control method, apparatus and device

Abstract

The application discloses a kind of intermediate shaft brake control method and device and equipment, the method comprises: by gathering vehicle operation information, determine to meet intermediate shaft brake speed regulation condition, obtain the speed difference of the two ends of combination sleeve;Current speed difference is compared with the threshold of different interval, determine the interval of speed difference, except directly close or directly start, if intermediate shaft brake closes and speed difference is located in start observation interval, whether the speed regulation time estimated according to intermediate shaft speed variation rate and target speed meets timeliness requirement, determine whether to open intermediate shaft brake;If intermediate shaft brake opens and speed difference is located in close observation interval, whether the speed regulation time estimated according to intermediate shaft speed variation rate and target speed meets timeliness requirement, determine whether to close intermediate shaft brake.The application introduces partition control on the basis of the boundary condition of speed difference, to effectively reduce the failure rate of intermediate shaft brake in prior art not activated or late exit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission, in particular to a method and device for controlling an intermediate shaft brake and equipment. BACKGROUND

[0002] With the development of transmission technology, the sliding sleeve shifting mode is applied more and more widely on AMT (automatic transmission). When the sliding sleeve shifts, the intermediate shaft speed needs to be regulated to the speed difference range of the output shaft speed standard, and then the transmission performs the gear engagement action.

[0003] During the shifting process of the transmission, the intermediate shaft brake can be automatically activated. In the traditional technology, the speed difference before and after the coupling sleeve is usually used as a boundary condition to determine whether the intermediate shaft brake is activated. When the speed difference is greater than the standard value, the intermediate shaft brake is activated, and when the speed difference falls within the standard range, the intermediate shaft brake is deactivated. The speed of the intermediate shaft is regulated, so that the sliding sleeve completes the shifting action at a suitable speed difference. However, during the control process of the intermediate shaft brake, problems such as the intermediate shaft brake not being activated or being deactivated late during the shifting process often occur, resulting in problems such as long shifting time due to slow speed reduction of the intermediate shaft or shifting failure due to excessive speed reduction of the intermediate shaft. SUMMARY

[0004] The present application provides a control method and device for an intermediate shaft brake and equipment, which is used to solve the problems of long shifting time due to slow speed reduction of the intermediate shaft or shifting failure due to excessive speed reduction of the intermediate shaft.

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

[0006] Collecting vehicle operation information, and determining the speed difference between the two ends of the coupling sleeve when the intermediate shaft brake speed regulation condition is met;

[0007] Comparing the current speed difference with the threshold values of different intervals to determine the interval in which the speed difference is located;

[0008] If the intermediate shaft brake is closed and the speed difference is located in the direct start interval, the intermediate shaft brake is directly started;

[0009] If the intermediate shaft brake is started and the speed difference is located in the direct closing interval, the intermediate shaft brake is directly closed;

[0010] If the intermediate shaft brake is closed and the speed difference is located in the start observation interval, it is determined whether to open the intermediate shaft brake according to whether the intermediate shaft speed change rate and the target speed estimated speed regulation time meet the timeliness requirement;

[0011] If the intermediate shaft brake is opened and the rotational speed difference is in the starting observation interval, whether the intermediate shaft brake is closed is determined according to whether the intermediate shaft rotational speed change rate and the target rotational speed estimated speed regulation time meet the timeliness requirement.

[0012] In a possible implementation, the current rotational speed difference is compared with threshold values of different intervals, and the interval in which the rotational speed difference is located is determined, including:

[0013] If the rotational speed difference is greater than the first rotational speed difference threshold value, it is determined that the rotational speed difference is in the direct starting interval;

[0014] If the rotational speed difference is not greater than the first rotational speed difference threshold value and is greater than the second rotational speed difference threshold value, it is determined that the rotational speed difference is in the starting observation interval;

[0015] If the rotational speed difference is less than the fourth rotational speed difference threshold value, it is determined that the rotational speed difference is in the direct closing interval;

[0016] If the rotational speed difference is not less than the fourth rotational speed difference threshold value and is less than the third rotational speed difference threshold value, it is determined that the rotational speed difference is in the closing observation interval;

[0017] The first rotational speed difference threshold value > the second rotational speed difference threshold value > the third rotational speed difference threshold value > the fourth rotational speed difference threshold value.

[0018] The threshold values of the different intervals are determined in the following manner:

[0019] The first calibration rotational speed difference threshold value nDiffInt1, the second calibration rotational speed difference threshold value nDiffInt2, the third calibration rotational speed difference threshold value nDiffInt3, and the fourth calibration rotational speed difference threshold value nDiffInt4 are acquired;

[0020] A temperature influence coefficient fac is determined according to the gearbox oil temperature, and the nDiffInt1, nDiffInt2, nDiffInt3, and nDiffInt4 are corrected by using the fac to obtain the first rotational speed difference threshold value nDiff1, the second rotational speed difference threshold value nDiff2, the third rotational speed difference threshold value nDiff3, and the fourth rotational speed difference threshold value nDiff4.

[0021] In a possible implementation, the nDiffInt1, nDiffInt2, nDiffInt3, and nDiffInt4 are pre-set in the following manner:

[0022] The nDiffInt1 is determined as the product of the maximum deceleration of the intermediate shaft and a time t, and the time t is between the response time t1 and the minimum opening time t2;

[0023] The nDiffInt2 is determined as the product of the average deceleration of the intermediate shaft and the time t;

[0024] nDiffInt3 is determined as the product of the maximum deceleration of the intermediate shaft and the response time t1;

[0025] nDiffInt4 is determined as the product of the average deceleration of the intermediate shaft and the response time t1.

[0026] In a possible implementation, the determining whether to open the intermediate shaft brake according to whether the estimated speed regulation time based on the intermediate shaft speed change rate and the target speed meets the timeliness requirement comprises:

[0027] estimating the speed regulation time Treq for the speed to reach the target speed according to the current speed and the intermediate shaft speed change rate;

[0028] determining the first speed regulation time threshold T1 according to the current speed difference, and determining to open the intermediate shaft brake when the estimated speed regulation time Treq is greater than the first speed regulation time threshold T1, or otherwise keeping the intermediate shaft brake closed;

[0029] the determining whether to close the intermediate shaft brake according to whether the estimated speed regulation time based on the intermediate shaft speed change rate and the target speed meets the timeliness requirement comprises:

[0030] estimating the speed regulation time Treq for the speed to reach the target speed according to the current speed and the intermediate shaft speed change rate;

[0031] determining the second speed regulation time threshold T2 according to the current speed difference, and determining to close the intermediate shaft brake when the estimated speed regulation time Treq is greater than the second speed regulation time threshold T2, or otherwise keeping the intermediate shaft brake open.

[0032] In a possible implementation, the first speed regulation time threshold T1 and the second speed regulation time threshold T2 are determined in the following manner:

[0033] calibrating the first speed regulation time threshold T1int and the second speed regulation time threshold T2int according to the current speed difference;

[0034] calibrating the temperature influence coefficient fac according to the gearbox oil temperature, and correcting the calibrated first speed regulation time threshold T1int and the second speed regulation time threshold T2int by using fac to obtain the first speed regulation time threshold T1 and the second speed regulation time threshold T2.

[0035] In a possible implementation, the speed difference between the two ends of the coupling sleeve is obtained in the following manner:

[0036] obtaining the front end speed nDiffF of the coupling sleeve according to the intermediate shaft speed divided by the main gearbox transmission ratio;

[0037] obtaining the rear end speed nDiffR of the coupling sleeve according to the output shaft speed multiplied by the range gear transmission ratio;

[0038] The difference in rotational speed of the coupling sleeve is nDiff = nDiffF - nDiffR.

[0039] In a second aspect, the present application provides a control device for a countershaft brake, the device comprising:

[0040] a difference in rotational speed determination module configured to collect vehicle operation information, and determine a difference in rotational speed of both ends of a coupling sleeve when a condition for regulating the speed of the countershaft brake is met;

[0041] an interval determination module configured to compare the current difference in rotational speed with threshold values of different intervals, and determine an interval in which the difference in rotational speed is located;

[0042] a direct control module configured to directly start / close the countershaft brake when the countershaft brake is closed and the difference in rotational speed is located in a direct start interval, or the countershaft brake is started and the difference in rotational speed is located in a direct close interval;

[0043] a start observation module configured to determine whether to open the countershaft brake according to whether a regulating time estimated by a change rate of the rotational speed of the countershaft and a target rotational speed meets a timeliness requirement when the countershaft brake is closed and the difference in rotational speed is located in a start observation interval;

[0044] a close observation module configured to determine whether to close the countershaft brake according to whether a regulating time estimated by a change rate of the rotational speed of the countershaft and a target rotational speed meets a timeliness requirement when the countershaft brake is opened and the difference in rotational speed is located in a close observation interval.

[0045] In a third aspect, the present application provides a control device for a countershaft brake, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the control method for the countershaft brake.

[0046] In a fourth aspect, the present application provides a computer readable storage medium, comprising: a computer program stored in the computer readable storage medium, and the computer program is executed by a computer to perform the control method for the countershaft brake.

[0047] The application discloses a control method and device and equipment of an intermediate shaft brake.

[0048] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings to be introduced below are only some of the embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0050] Figure 1 The flow chart of the control method of the intermediate shaft brake provided by the embodiments of the present application is shown in the figure.

[0051] Figure 2 The flow chart of the method for determining that the speed regulation condition of the intermediate shaft brake is met provided by the embodiments of the present application is shown in the figure.

[0052] Figure 3 The flow chart of the control method of the intermediate shaft brake exemplified by the embodiments of the present application is shown in the figure.

[0053] Figure 4 The structural diagram of the control device of the intermediate shaft brake provided by the embodiments of the present application is shown in the figure.

[0054] Figure 5 The structural diagram of the control device of the intermediate shaft brake provided by the embodiments of the present application is shown in the figure. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be described clearly and exhaustively in combination with the drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B.

[0056] To further illustrate the technical solutions provided by the embodiments of the present application, this is described in detail below in conjunction with the accompanying drawings and specific implementation methods. Although the embodiments of the present application provide the method operation steps as shown in the following embodiments or drawings, more or fewer operation steps may be included in the method based on routine or no creative labor. In steps where there is no necessary causal relationship logically, the execution order of these steps is not limited to the execution order provided by the embodiments of the present application. During the actual processing process or when the control device is executed, the method can be executed in the order of the methods shown in the embodiments or drawings or in parallel.

[0057] In the related art, only the speed difference before and after the coupling sleeve is used as a boundary condition to determine whether the intermediate shaft brake is activated. During the braking control process of the intermediate shaft brake, problems such as the intermediate shaft brake not being activated or being released late during the gear shifting process often occur, resulting in slow deceleration of the intermediate shaft and a long gear shifting time, or excessive deceleration of the intermediate shaft and resulting in gear shift failure. The present application provides a method, device and equipment for controlling the intermediate shaft brake.

[0058] Figure 1 A flowchart of a method for controlling an intermediate shaft brake provided in an embodiment of the present application is exemplarily shown. The flowchart mainly includes:

[0059] S101: Collecting vehicle operation information, and when determining that the intermediate shaft brake speed regulation conditions are met, obtaining the speed difference between the two ends of the coupling sleeve;

[0060] The vehicle operation information may include, but is not limited to, whether the vehicle is parked or not, whether the vehicle is disengaged, the current requested gear position, and the actual gear position. If necessary, the rotational speed of the front end of the intermediate shaft (i.e., the rotational speed of the intermediate shaft input shaft) may also be collected. Based on the vehicle operation information, if a shift is currently in progress and the intermediate shaft speed needs to be adjusted, the intermediate shaft speed adjustment conditions are determined to be met, and the rotational speed of the front end of the coupling sleeve (i.e., the rotational speed of the intermediate shaft input shaft) and the rotational speed of the rear end of the coupling sleeve (i.e., the rotational speed of the intermediate shaft output shaft) are collected to determine the speed difference between the two ends of the coupling sleeve.

[0061] S102: Compare the current speed difference with thresholds of different intervals to determine the interval in which the speed difference is located, and execute step 103, step 104, step 105, or step 106 according to the determination result;

[0062] The present application further divides the interval between a first threshold for directly activating the intermediate shaft brake and a fourth threshold for directly deactivating the intermediate shaft brake into a range that includes a direct activation range greater than the first threshold, a direct deactivation range less than the fourth threshold, and an activation observation range and an activation deactivation range between the first and fourth thresholds. The difference between the first threshold being greater than the fourth threshold and the minimum value of the activation observation range being greater than the maximum value of the activation deactivation range is a set value, which is greater than 1.

[0063] S103: If the intermediate shaft brake is closed and the speed difference is in the direct start interval, directly start the intermediate shaft brake.

[0064] If the intermediate shaft brake is closed and the speed difference is in the direct start interval, the difference between the output shaft speed of the intermediate shaft and the target speed is relatively large, the intermediate shaft brake needs to be started in time to improve the speed reduction speed of the intermediate shaft to achieve fast shifting.

[0065] S104: If the intermediate shaft brake is started and the speed difference is in the direct close interval, directly close the intermediate shaft brake.

[0066] If the intermediate shaft brake is started and the speed difference is in the direct close interval, it indicates that the output shaft speed of the intermediate shaft is close to the target speed, and the intermediate shaft brake needs to be closed in time to prevent the intermediate shaft from reducing speed too fast and causing shifting failure.

[0067] S105: If the intermediate shaft brake is closed and the speed difference is in the start observation interval, determine whether to open the intermediate shaft brake according to whether the speed change rate of the intermediate shaft and the estimated speed regulation time of the target speed meet the timeliness requirement.

[0068] If the intermediate shaft brake is closed and the speed difference is in the start observation interval, it indicates that the output shaft speed of the intermediate shaft has a certain difference from the target speed, but the difference is not too large. However, whether to use the intermediate shaft brake needs to collect the current speed change rate of the intermediate shaft. According to the current speed change rate of the intermediate shaft, it is judged that the speed regulation time required to reach the output shaft speed of the intermediate shaft from the target speed without starting the intermediate shaft brake. If the speed regulation time meets the timeliness requirement, the intermediate shaft brake can not be started to prevent the intermediate shaft from reducing speed too fast and causing shifting failure under this condition. If the speed regulation time does not meet the timeliness requirement, the intermediate shaft brake is started again to improve the speed reduction speed of the intermediate shaft to achieve fast shifting.

[0069] S106: If the intermediate shaft brake is opened and the speed difference is in the close observation interval, determine whether to close the intermediate shaft brake according to whether the speed change rate of the intermediate shaft and the estimated speed regulation time of the target speed meet the timeliness requirement.

[0070] If the intermediate shaft brake is opened and the speed difference is in the closing observation interval, it indicates that the output shaft speed of the intermediate shaft has a certain difference from the target speed, but the difference is not too small. However, whether the intermediate shaft brake needs to be used needs to collect the current intermediate shaft speed change rate. According to the current intermediate shaft speed change rate, it is judged that the speed regulating time required to reach the output shaft speed of the intermediate shaft from the target speed without opening the intermediate shaft brake. If the speed regulating time meets the timeliness requirement, the intermediate shaft brake can be closed to prevent the intermediate shaft from being reduced too fast to cause shift failure under this condition. If the speed regulating time does not meet the timeliness requirement, the intermediate shaft brake is not closed, and the speed of the intermediate shaft is increased to achieve fast shifting.

[0071] The control method of the intermediate shaft brake provided by the above embodiments of the present application introduces partition control on the basis of the boundary condition of the speed difference, accurately controls the speed difference in different intervals, introduces the intermediate shaft speed change rate, estimates the speed regulating time, and takes the speed regulating time as one of the boundary conditions, thereby effectively reducing the failure rate of the intermediate shaft brake not being activated or late exiting.

[0072] The threshold values of the different intervals in the embodiments of the present application include the first speed difference threshold value, the fourth speed difference threshold value, the second speed difference threshold value for defining the starting observation interval, and the third speed difference threshold value for defining the closing observation interval.

[0073] The first speed difference threshold value > the second speed difference threshold value > the third speed difference threshold value > the fourth speed difference threshold value.

[0074] As an optional implementation, the current speed difference is compared with the threshold values of different intervals to determine the interval of the speed difference, including:

[0075] If the speed difference is greater than the first speed difference threshold value, it is determined that the speed difference is in the direct starting interval.

[0076] If the speed difference is not greater than the first speed difference threshold value and is greater than the second speed difference threshold value, it is determined that the speed difference is in the starting observation interval.

[0077] If the speed difference is less than the fourth speed difference threshold value, it is determined that the speed difference is in the direct closing interval.

[0078] If the speed difference is not less than the fourth speed difference threshold value and is less than the third speed difference threshold value, it is determined that the speed difference is in the closing observation interval.

[0079] As an optional implementation, if the speed difference is not less than the third speed difference threshold value and is not greater than the second speed difference threshold value, it is determined that the speed difference is in the intermediate interval.

[0080] In one possible implementation, if the intermediate shaft brake is closed and the speed difference is in the intermediate interval, the intermediate shaft brake is not opened.

[0081] In another possible implementation, if the intermediate shaft brake is opened and the speed difference is in the intermediate interval, the intermediate shaft brake is not closed.

[0082] In one possible implementation, the embodiment of the application determines whether to open the intermediate shaft brake according to whether the intermediate shaft speed change rate and the estimated speed regulation time of the target speed meet the timeliness requirement, and includes the following steps:

[0083] estimating the speed regulation time Treq of the target speed according to the current speed and the intermediate shaft speed change rate;

[0084] determining a first speed regulation time threshold T1 according to the current speed difference, and determining to open the intermediate shaft brake when the estimated speed regulation time Treq is greater than the first speed regulation time threshold T1, or otherwise keeping the intermediate shaft brake closed;

[0085] If the estimated speed regulation time Treq is greater than the first speed regulation time threshold T1, it indicates that the estimated speed regulation time does not meet the timeliness requirement, and in this case, the intermediate shaft brake needs to be opened to prevent slow shifting caused by not opening the intermediate shaft brake in this state;

[0086] If the estimated speed regulation time Treq is less than the first speed regulation time threshold T1, it indicates that the estimated speed regulation time meets the timeliness requirement, and in this case, the intermediate shaft brake does not need to be opened to prevent fast speed reduction of the intermediate shaft caused by opening the intermediate shaft brake in this state, which causes shifting failure;

[0087] In one possible implementation, the embodiment of the application determines whether to close the intermediate shaft brake according to whether the intermediate shaft speed change rate and the estimated speed regulation time of the target speed meet the timeliness requirement, and includes the following steps:

[0088] estimating the speed regulation time Treq of the target speed according to the current speed and the intermediate shaft speed change rate;

[0089] determining a second speed regulation time threshold T2 according to the current speed difference, and determining to close the intermediate shaft brake when the estimated speed regulation time Treq is greater than the second speed regulation time threshold T2, or otherwise keeping the intermediate shaft brake opened.

[0090] If the estimated speed regulation time Treq is less than the second speed regulation time threshold T2, it indicates that the estimated speed regulation time meets the timeliness requirement, and in this case, the intermediate shaft brake can be closed to prevent fast speed reduction of the intermediate shaft caused by opening the intermediate shaft brake in this state, which causes shifting failure;

[0091] If the estimated speed regulation time Treq is greater than the second speed regulation time threshold T2, it indicates that the estimated speed regulation time meets the timeliness requirement, and the intermediate shaft brake can not be closed to prevent slow shifting caused by closing the intermediate shaft brake in this state.

[0092] The first speed regulation time threshold T1 and the second speed regulation time threshold T2 are determined in the following manner in the embodiments of the present application:

[0093] The first speed regulation time threshold T1int and the second speed regulation time threshold T2int are calibrated according to the current speed difference;

[0094] The temperature influence coefficient fac is calibrated according to the transmission oil temperature, and fac is used to correct the calibrated first speed regulation time threshold T1int and the calibrated second speed regulation time threshold T2int to obtain the first speed regulation time threshold T1 and the second speed regulation time threshold T2.

[0095] As a possible implementation, the speed regulation time threshold is directly proportional to the speed difference. The greater the speed difference, the longer the speed regulation time from the current speed difference to the target speed. In the embodiments of the present application, the variation range of the speed regulation time threshold calibrated according to the speed difference is within a set range. Within the set range, the specific speed regulation time threshold is determined according to the direct proportion relationship between the speed regulation time threshold and the speed difference. Further, the minimum opening time of the control valve, the delay response time of the automobile hardware and software can also be considered to determine the speed regulation time threshold.

[0096] As a possible implementation, the above T1int and T2int are directly used as the first speed regulation time threshold and the second speed regulation time threshold.

[0097] As another possible implementation, since the oil temperature of the transmission has a certain influence on the speed difference during actual vehicle operation, the temperature influence coefficient fac can be determined according to the transmission oil temperature, and fac is used to correct T1int and T2int to obtain the first speed regulation time threshold T1 and the second speed regulation time threshold T2.

[0098] The transmission oil temperature and the temperature influence coefficient fac are inversely proportional. The higher the transmission oil temperature, the smaller the temperature influence coefficient fac. The higher the transmission oil temperature, the smaller the temperature influence coefficient fac. The lower the transmission oil temperature, the greater the temperature influence coefficient fac. In this way, for vehicles operating in cold regions, the intermediate shaft brake can be closed in advance to effectively prevent the intermediate shaft from slowing down too fast and causing shifting failure.

[0099] The embodiment of the application can pre-set a first calibration speed difference threshold nDiffInt1, a second calibration speed difference threshold nDiffInt2, a third calibration speed difference threshold nDiffInt3 and a fourth calibration speed difference threshold nDiffInt4, and determine a first speed difference threshold, a second speed difference threshold, a third speed difference threshold and a fourth speed difference threshold according to the first calibration speed difference threshold nDiffInt1, the second calibration speed difference threshold nDiffInt2, the third calibration speed difference threshold nDiffInt3 and the fourth calibration speed difference threshold nDiffInt4.

[0100] In a possible implementation, the nDiffInt1, nDiffInt2, nDiffInt3 and nDiffInt4 are directly used as the first speed difference threshold, the second speed difference threshold, the third speed difference threshold and the fourth speed difference threshold.

[0101] In another possible implementation, since the oil temperature of the gearbox has certain influence on the speed difference when the vehicle is actually running, a temperature influence coefficient fac can be determined according to the oil temperature of the gearbox, and the nDiffInt1, nDiffInt2, nDiffInt3 and nDiffInt4 are corrected by using the fac to obtain a first speed difference threshold nDiff1, a second speed difference threshold nDiff2, a third speed difference threshold nDiff3 and a fourth speed difference threshold nDiff4.

[0102] The oil temperature of the gearbox and the temperature influence coefficient fac are in an inverse proportional relationship, that is, the higher the oil temperature of the gearbox, the smaller the temperature influence coefficient fac, the higher the oil temperature of the gearbox, the smaller the temperature influence coefficient fac, and the lower the oil temperature of the gearbox, the larger the temperature influence coefficient fac. In this way, for a vehicle running in a cold region, the intermediate shaft brake can be closed in advance, and the rapid speed reduction of the intermediate shaft caused by the shift failure can be effectively prevented.

[0103] The embodiment of the application pre-sets the nDiffInt1, nDiffInt2, nDiffInt3 and nDiffInt4 in the following manner:

[0104] The nDiffInt1 is determined as the product of the maximum deceleration of the intermediate shaft and a time t, and the time t is between a response time t1 and a minimum opening time t2, the response time t1 is the delayed response time of the hardware and software of the vehicle, and the minimum opening time t2 is the minimum opening time of the control valve;

[0105] The nDiffInt2 is determined as the product of the average deceleration of the intermediate shaft and the time t;

[0106] The nDiffInt3 is determined as the product of the maximum deceleration of the intermediate shaft and the response time t1;

[0107] nDiffInt4 is determined as the product of the average deceleration of the intermediate shaft and the response time t1.

[0108] In one possible implementation, the rotational speed difference between the two ends of the coupling sleeve is obtained, including:

[0109] The rotational speed of the front end of the coupling sleeve nDiffF is obtained according to the rotational speed of the intermediate shaft divided by the main gear transmission ratio;

[0110] The rotational speed of the rear end of the coupling sleeve nDiffR is obtained according to the rotational speed of the output shaft multiplied by the range gear transmission ratio;

[0111] The rotational speed difference between the two ends of the coupling sleeve nDiff is obtained as nDiffF-nDiffR.

[0112] As one possible implementation, the determination of whether the intermediate shaft brake satisfies the speed regulation condition can be determined according to the vehicle operating information in the following manner:

[0113] When the vehicle state is a parking state, if the demand gear is non-zero and the current gear is already disengaged, and the rotational speed of the input shaft of the intermediate shaft is greater than a calibration value, it is determined that the intermediate shaft brake satisfies the speed regulation condition.

[0114] When the vehicle state is a non-parking state, if the demand gear is greater than the actual gear and the gear is already disengaged, it is determined that the intermediate shaft brake satisfies the speed regulation condition. Figure 2 A flowchart for determining whether the intermediate shaft brake satisfies the speed regulation condition is provided, which mainly includes:

[0115] S201: Collect vehicle operating information;

[0116] The vehicle operating information can include but is not limited to the state of the vehicle being in a parking or non-parking state, whether the vehicle is disengaged, the current demand gear and actual gear, and if necessary, the rotational speed of the front end of the intermediate shaft (i.e., the rotational speed of the input shaft of the intermediate shaft).

[0117] S202: Determine whether the vehicle is in a parking state, if yes, execute S203, otherwise execute S204.

[0118] S203: Determine whether the vehicle demand gear is non-zero and the gear is already disengaged, if yes, execute S205, otherwise return to S203.

[0119] S204: Determine whether the demand gear of the vehicle is greater than the actual gear and the gear is already disengaged, if yes, execute S206, otherwise return to S204.

[0120] S205: Determine whether the rotational speed of the input shaft is greater than a calibration value, if yes, execute S206, otherwise end.

[0121] S206: Determine that the intermediate shaft brake speed regulation condition is met.

[0122] The following describes the detailed flow of the control method of the intermediate shaft brake with the first speed difference threshold nDiff1, the second speed difference threshold nDiff2, the third speed difference threshold nDiff3, and the fourth speed difference threshold nDiff4 obtained by modifying nDiffInt1, nDiffInt2, nDiffInt3, and nDiffInt4 by fac as an example.

[0123] Figure 3 An exemplary flowchart of the control method of the intermediate shaft brake is shown. The flow mainly includes:

[0124] S301: Obtain the speed difference nDiff between the two ends of the coupling sleeve.

[0125] S302: Determine whether the speed difference nDiff is greater than the first speed difference threshold nDiff1. If yes, execute S303, otherwise execute S304.

[0126] S303: Start the intermediate shaft brake.

[0127] S304: Determine whether the speed difference nDiff is greater than the second speed difference threshold nDiff2. If yes, execute S305, otherwise end.

[0128] S305: Calculate the first speed regulation time threshold T1 according to the speed difference nDiff, and calculate the predicted speed regulation time Treq according to the speed change rate.

[0129] S306: Determine whether the predicted speed regulation time Treq is greater than the first speed regulation time threshold T1. If yes, execute S303, otherwise end.

[0130] S307: Determine whether the speed difference nDiff is less than the fourth speed difference threshold nDiff4. If yes, execute S308, otherwise execute S309.

[0131] S308: Turn off the intermediate shaft brake.

[0132] S309: Determine whether the speed difference nDiff is less than the third speed difference threshold nDiff3. If yes, execute S310, otherwise execute S303.

[0133] S310: Calculate the second speed regulation time threshold T2 according to the speed difference nDiff, and calculate the predicted speed regulation time Treq according to the speed change rate.

[0134] S311: Determine whether the predicted speed regulation time Treq is less than the second speed regulation time threshold T2. If yes, execute S308. Otherwise, execute S303.

[0135] In the embodiments of the present application, on the basis of the prior art using the speed difference boundary condition to determine whether to start the intermediate shaft brake, a partition control method of the speed difference is introduced. Compared with the only start interval and the close interval in the prior art, the speed difference is further divided into a start observation interval and a close observation interval, the interval of the speed difference is accurately controlled, and the failure rate of the intermediate shaft brake not being activated or late exiting is effectively reduced. In the partition control, the speed difference and the speed change rate of the intermediate shaft of the vehicle at the moment are collected, the speed regulation time threshold and the estimated speed regulation time are calculated, whether the intermediate shaft brake should be started is pre-judged according to the timeliness, and when the speed regulation time threshold is sufficient, the intermediate shaft brake can be directly closed, thereby effectively improving the adaptability of the intermediate shaft brake control strategy. The gearbox oil temperature is further introduced as a correction factor to correct the speed difference and the speed regulation time threshold, and the control precision of the intermediate shaft brake is improved.

[0136] Based on the same inventive concept, the present application also provides a device for controlling an intermediate shaft brake, as shown in Figure 4 The device comprises:

[0137] The speed difference determination module 401 is configured to collect vehicle operation information, and determine the speed difference between the two ends of the coupling sleeve when the intermediate shaft brake speed regulation condition is met.

[0138] The interval determination module 402 is configured to compare the current speed difference with the threshold values of different intervals, and determine the interval in which the speed difference is located.

[0139] The direct control module 403 is configured to directly start / close the intermediate shaft brake when the intermediate shaft brake is closed and the speed difference is located in the direct start interval, or the intermediate shaft brake is started and the speed difference is located in the direct close interval.

[0140] The start observation module 404 is configured to determine whether to open the intermediate shaft brake according to whether the speed regulation time estimated by the intermediate shaft speed change rate and the target speed meets the timeliness requirement when the intermediate shaft brake is closed and the speed difference is located in the start observation interval.

[0141] The close observation module 405 is configured to determine whether to close the intermediate shaft brake according to whether the speed regulation time estimated by the intermediate shaft speed change rate and the target speed meets the timeliness requirement when the intermediate shaft brake is opened and the speed difference is located in the close observation interval.

[0142] Comparing the current speed difference with the threshold values of different intervals to determine the interval in which the speed difference is located comprises:

[0143] if the speed difference is greater than a first speed difference threshold, determining that the speed difference is in a direct start interval;

[0144] if the speed difference is not greater than the first speed difference threshold and is greater than a second speed difference threshold, determining that the speed difference is in a start observation interval;

[0145] if the speed difference is not less than the fourth speed difference threshold and is less than a third speed difference threshold, determining that the speed difference is in a close observation interval;

[0146] if the speed difference is not less than the fourth speed difference threshold and is less than a third speed difference threshold, determining that the speed difference is in a close observation interval;

[0147] the first speed difference threshold > the second speed difference threshold > the third speed difference threshold > the fourth speed difference threshold.

[0148] As a possible implementation, the thresholds of the different intervals are determined as follows:

[0149] a first calibration speed difference threshold nDiffInt1, a second calibration speed difference threshold nDiffInt2, a third calibration speed difference threshold nDiffInt3 and a fourth calibration speed difference threshold nDiffInt4 are obtained in advance;

[0150] a temperature influence coefficient fac is determined according to the temperature of the gearbox oil, and nDiffInt1, nDiffInt2, nDiffInt3 and nDiffInt4 are corrected by using the fac to obtain a first speed difference threshold nDiff1, a second speed difference threshold nDiff2, a third speed difference threshold nDiff3 and a fourth speed difference threshold nDiff4.

[0151] As a possible implementation, nDiffInt1, nDiffInt2, nDiffInt3 and nDiffInt4 are obtained in advance as follows:

[0152] nDiffInt1 is determined as the product of the maximum deceleration of the intermediate shaft and a time t, the time t being between the response time t1 and the minimum opening time t2;

[0153] nDiffInt2 is determined as the product of the average deceleration of the intermediate shaft and the time t;

[0154] nDiffInt3 is determined as the product of the maximum deceleration of the intermediate shaft and the response time t1;

[0155] nDiffInt4 is determined as the product of the average deceleration of the intermediate shaft and the response time t1.

[0156] As a possible implementation, the direct control module determines whether to open the intermediate shaft brake according to whether the estimated speed regulation time of the intermediate shaft rotational speed and the target rotational speed meets the timeliness requirement, comprising:

[0157] estimating the speed regulation time Treq of the rotational speed reaching the target rotational speed according to the current rotational speed and the intermediate shaft rotational speed change rate;

[0158] determining the first speed regulation time threshold according to the current rotational speed difference, and determining to open the intermediate shaft brake when the estimated speed regulation time Treq is greater than the first speed regulation time threshold T1, otherwise keeping the intermediate shaft brake closed;

[0159] The direct control module determines whether to open the intermediate shaft brake according to whether the estimated speed regulation time of the intermediate shaft rotational speed and the target rotational speed meets the timeliness requirement, comprising:

[0160] estimating the speed regulation time Treq of the rotational speed reaching the target rotational speed according to the current rotational speed and the intermediate shaft rotational speed change rate;

[0161] determining the second speed regulation time threshold T2 according to the current rotational speed difference, and determining to close the intermediate shaft brake when the estimated speed regulation time Treq is greater than the second speed regulation time threshold T2, otherwise keeping the intermediate shaft brake open.

[0162] As a possible implementation, the first speed regulation time threshold T1 and the second speed regulation time threshold T2 are determined as follows:

[0163] calibrating the first speed regulation time threshold T1int and the second speed regulation time threshold T2int according to the current rotational speed difference;

[0164] calibrating the first speed regulation time threshold T1int and the second speed regulation time threshold T2int according to the current rotational speed difference;

[0165] As a possible implementation, the rotational speed difference determination module obtains the rotational speed difference between the two ends of the coupling sleeve, comprising:

[0166] obtaining the front end rotational speed nDiffF of the coupling sleeve according to the intermediate shaft rotational speed divided by the main gearbox transmission ratio;

[0167] obtaining the rear end rotational speed nDiffR of the coupling sleeve according to the output shaft rotational speed multiplied by the range gear transmission ratio;

[0168] obtaining the rotational speed difference nDiff between the two ends of the coupling sleeve nDiffF-nDiffR.

[0169] After introducing the control method and device of the intermediate shaft brake in the exemplary embodiments of the present application, next, the control device of the intermediate shaft brake according to another exemplary embodiment of the present application is introduced.

[0170] The embodiments of the present application provide a vehicle, which comprises the control device of the intermediate shaft brake provided in the above embodiments, such as Figure 5 As shown in the figure, the control device of the intermediate shaft brake can comprise at least one processor and at least one memory. The memory stores program codes, which, when executed by the processor, cause the processor to perform the following steps:

[0171] collecting vehicle running information, and determining a speed difference between the two ends of the coupling sleeve when the intermediate shaft brake speed regulation condition is met;

[0172] comparing the current speed difference with the threshold values of different intervals to determine the interval in which the speed difference is located;

[0173] if the intermediate shaft brake is closed and the speed difference is located in the direct start interval, directly starting the intermediate shaft brake;

[0174] if the intermediate shaft brake is started and the speed difference is located in the direct close interval, directly closing the intermediate shaft brake;

[0175] if the intermediate shaft brake is closed and the speed difference is located in the start observation interval, determining whether to open the intermediate shaft brake according to whether the speed regulation time estimated by the intermediate shaft speed change rate and the target speed meets the timeliness requirement;

[0176] if the intermediate shaft brake is opened and the speed difference is located in the close observation interval, determining whether to close the intermediate shaft brake according to whether the speed regulation time estimated by the intermediate shaft speed change rate and the target speed meets the timeliness requirement.

[0177] As a possible embodiment, the processor compares the current speed difference with the threshold values of different intervals to determine the interval in which the speed difference is located, which comprises:

[0178] if the speed difference is greater than the first speed difference threshold value, it is determined that the speed difference is located in the direct start interval;

[0179] if the speed difference is not greater than the first speed difference threshold value and is greater than the second speed difference threshold value, it is determined that the speed difference is located in the start observation interval;

[0180] if the speed difference is less than the fourth speed difference threshold value, it is determined that the speed difference is located in the direct close interval;

[0181] if the speed difference is not less than the fourth speed difference threshold value and is less than the third speed difference threshold value, it is determined that the speed difference is located in the close observation interval;

[0182] The first rotation speed difference threshold > the second rotation speed difference threshold > the third rotation speed difference threshold > the fourth rotation speed difference threshold.

[0183] As a possible embodiment, the processor determines the threshold of different intervals in the following way:

[0184] The first calibration rotation speed difference threshold nDiffInt1, the second calibration rotation speed difference threshold nDiffInt2, the third calibration rotation speed difference threshold nDiffInt3 and the fourth calibration rotation speed difference threshold nDiffInt4 are obtained in advance;

[0185] The temperature influence coefficient fac is determined according to the gearbox oil temperature, and the nDiffInt1, nDiffInt2, nDiffInt3 and nDiffInt4 are corrected by using the fac to obtain the first rotation speed difference threshold nDiff1, the second rotation speed difference threshold nDiff2, the third rotation speed difference threshold nDiff3 and the fourth rotation speed difference threshold nDiff4.

[0186] As a possible embodiment, the processor sets nDiffInt1, nDiffInt2, nDiffInt3 and nDiffInt4 in the following way:

[0187] The nDiffInt1 is determined as the product of the maximum deceleration of the intermediate shaft and the time t, and the time t is between the response time t1 and the minimum opening time t2;

[0188] The nDiffInt2 is determined as the product of the average deceleration of the intermediate shaft and the time t;

[0189] The nDiffInt3 is determined as the product of the maximum deceleration of the intermediate shaft and the response time t1;

[0190] The nDiffInt4 is determined as the product of the average deceleration of the intermediate shaft and the response time t1.

[0191] As a possible embodiment, the processor determines whether to open the intermediate shaft brake according to whether the intermediate shaft rotation speed change rate and the estimated speed regulation time of the target rotation speed meet the timeliness requirement, including:

[0192] The first speed regulation time for the rotation speed to reach the target rotation speed is estimated according to the current rotation speed and the intermediate shaft rotation speed change rate;

[0193] According to the first speed regulation time threshold determined in advance, when the first speed regulation time is greater than the first speed regulation time threshold, it is determined to open the intermediate shaft brake, otherwise the intermediate shaft brake is kept closed.

[0194] The processor determines whether to close the intermediate shaft brake according to whether the intermediate shaft speed change rate and the target speed estimated speed regulation time meet the timeliness requirement, including:

[0195] According to the current speed and the intermediate shaft speed change rate, a first speed regulation time is estimated for the speed to reach the target speed;

[0196] According to a predetermined second speed regulation time threshold, when the second speed regulation time is greater than the second speed regulation time threshold, it is determined to close the intermediate shaft brake, otherwise the intermediate shaft brake is kept open.

[0197] As a possible embodiment, the processor determines the first speed regulation time threshold and the second speed regulation time threshold in the following way:

[0198] A first calibration speed regulation time threshold and a second calibration speed regulation time threshold are obtained in advance;

[0199] According to the transmission oil temperature calibration temperature influence coefficient fac, the first calibration speed regulation time threshold and the second calibration speed regulation time threshold are corrected by fac to obtain the first speed regulation time threshold and the second speed regulation time threshold.

[0200] As a possible embodiment, the processor obtains the difference between the two ends of the coupling, including:

[0201] According to the intermediate shaft speed divided by the main box transmission ratio, the front end speed of the coupling nDiffF is obtained;

[0202] According to the output shaft speed multiplied by the range gear transmission ratio, the rear end speed of the coupling nDiffR is obtained;

[0203] The difference between the two ends of the coupling nDiff = nDiffF - nDiffR is obtained.

[0204] In some possible embodiments, the various aspects of the intermediate shaft brake control method provided by the present application can also be implemented in the form of a program product, which includes program code for causing the computer device to execute the steps of the intermediate shaft brake control method according to various exemplary embodiments of the present application described above in the specification when the program product is run on the computer device.

[0205] The program product of the embodiments of the present application for the intermediate shaft brake control method can employ a compact disc read-only memory (CD-ROM) and include a program code, and can be run on an electronic device. However, the program product of the present application is not limited thereto, and in the present document, a readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0206] The program product of the embodiments of the present application for the intermediate shaft brake control method can employ a compact disc read-only memory (CD-ROM) and include a program code, and can be run on an electronic device. However, the program product of the present application is not limited thereto, and in the present document, a readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0207] The readable signal medium can include a data signal that is propagated in baseband or that is propagated as a carrier wave, in which the readable program code is contained. Such a propagated signal can take any of a variety of forms, including but not limited to electro-magnetic, optical, or any suitable combination thereof. The readable signal medium can also be any readable medium that is not a storage medium or that is not medium that is not a readable storage medium that can communicate, propagate, or transport program for use by or in connection with an instruction execution system, apparatus, or device.

[0208] The program code contained on the readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber cable, RF, and the like, or any suitable combination thereof.

[0209] The program code for carrying out operations of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++, and the like, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's electronic device, partly on the user's electronic device, as a stand-alone software package, partly on the user's electronic device and partly on a remote electronic device or entirely on the remote electronic device or server. In the latter scenario, the remote electronic device can be connected to the user's electronic device through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external electronic device (for example, through the Internet using an Internet Service Provider).

[0210] It should be noted that while several units or sub-units of the apparatus are mentioned in the above detailed description, such a division is merely exemplary and not mandatory. Indeed, according to an embodiment of the application, the features and functionalities of two or more units described above can be embodied in one unit. Conversely, the features and functionalities of one unit described above can be further divided into units embodied by several units.

[0211] Moreover, while operations of the methods of the present application are described in a particular order in the figures, this is not required or implied in any manner, nor is it required that all of the operations be performed to achieve the desired result. Additionally or alternatively, certain steps can be omitted, combined into a single step, and / or broken into multiple steps.

[0212] Those skilled in the art will appreciate that embodiments of the present application can be readily used as a method, a system, or a computer program product. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, and the like) embodying computer readable program code.

[0213] The present application is described in reference to the flowchart illustrations and block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and block diagrams, and combinations of blocks in the flowchart illustrations and block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processing system or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks or combinations of flowchart blocks and blocks in the block diagrams. Figure 1 one or more functions specified in the flowchart block or blocks or combinations of flowchart blocks and blocks in the block diagrams. Figure 1 one or more functions specified in the flowchart block or blocks or combinations of flowchart blocks and blocks in the block diagrams.

[0214] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the functions specified in the flowchart block or blocks or combinations of flowchart blocks and blocks in the block diagrams. Figure 1 one or more functions specified in the flowchart block or blocks or combinations of flowchart blocks and blocks in the block diagrams. Figure 1 one or more functions specified in the flowchart block or blocks or combinations of flowchart blocks and blocks in the block diagrams.

[0215] These computer program instructions can also be loaded into a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 These computer program instructions can also be loaded into a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 These computer program instructions can also be loaded into a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.

[0216] While the preferred embodiments of the application have been described, it should be apparent that a little thought and experimentation can lead to the development of other techniques and approaches that are widely equivalent to those described above. Accordingly, no limitation is intended to the scope of the claims except as it can be derived from the following claims.

[0217] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A control method of a countershaft brake, characterized by, The method comprises: Collecting vehicle operation information, determining a speed difference between the two ends of the coupling sleeve when the intermediate shaft brake speed regulation condition is met; Comparing the current speed difference with the threshold values of different intervals to determine the interval in which the speed difference is located; If the intermediate shaft brake is closed and the speed difference is located in the direct start interval, directly starting the intermediate shaft brake; If the intermediate shaft brake is started and the speed difference is located in the direct close interval, directly closing the intermediate shaft brake; If the intermediate shaft brake is closed and the speed difference is located in the start observation interval, determining whether to open the intermediate shaft brake according to whether the intermediate shaft speed change rate and the estimated speed regulation time of the target speed meet the timeliness requirement; If the intermediate shaft brake is opened and the speed difference is located in the close observation interval, determining whether to close the intermediate shaft brake according to whether the intermediate shaft speed change rate and the estimated speed regulation time of the target speed meet the timeliness requirement.

2. The method of claim 1, wherein, Comparing the current speed difference with the threshold values of different intervals to determine the interval in which the speed difference is located, comprising: If the speed difference is greater than the first speed difference threshold value, it is determined that the speed difference is located in the direct start interval; If the speed difference is not greater than the first speed difference threshold value and is greater than the second speed difference threshold value, it is determined that the speed difference is located in the start observation interval; If the speed difference is less than the fourth speed difference threshold value, it is determined that the speed difference is located in the direct close interval; If the speed difference is not less than the fourth speed difference threshold value and is less than the third speed difference threshold value, it is determined that the speed difference is located in the close observation interval; The first speed difference threshold value > the second speed difference threshold value > the third speed difference threshold value > the fourth speed difference threshold value.

3. The method of claim 2, wherein, The threshold values of the different intervals are determined in the following manner: Obtaining a first calibration speed difference threshold value nDiffInt1, a second calibration speed difference threshold value nDiffInt2, a third calibration speed difference threshold value nDiffInt3, and a fourth calibration speed difference threshold value nDiffInt4 that are set in advance; Determining a temperature influence coefficient fac according to the transmission oil temperature, and correcting nDiffInt1, nDiffInt2, nDiffInt3, and nDiffInt4 by using fac to obtain a first speed difference threshold value nDiff1, a second speed difference threshold value nDiff2, a third speed difference threshold value nDiff3, and a fourth speed difference threshold value nDiff4.

4. The method of claim 3, wherein, nDiffInt1, nDiffInt2, nDiffInt3, and nDiffInt4 are set in advance in the following manner: Determining nDiffInt1 as the product of the maximum deceleration of the intermediate shaft and a time t, the time t being between the response time t1 and the minimum opening time t2; Determining nDiffInt2 as the product of the average deceleration of the intermediate shaft and the time t; Determining nDiffInt3 as the product of the maximum deceleration of the intermediate shaft and the response time t1; Determining nDiffInt4 as the product of the average deceleration of the intermediate shaft and the response time t1.

5. The method of claim 1, wherein, The determination of whether to open the intermediate shaft brake according to whether the intermediate shaft speed change rate and the estimated speed regulation time of the target speed meet the timeliness requirement comprises: According to the current speed and the intermediate shaft speed change rate, the speed regulation time Treq when the speed reaches the target speed is estimated; According to the current speed difference, a first speed regulation time threshold T1 is determined, and when the estimated speed regulation time Treq is greater than the first speed regulation time threshold T1, it is determined to open the intermediate shaft brake, otherwise the intermediate shaft brake is kept closed; The determination of whether to close the intermediate shaft brake according to whether the speed regulation time estimated according to the intermediate shaft speed change rate and the target speed meets the timeliness requirement, comprises: According to the current speed and the intermediate shaft speed change rate, the speed regulation time Treq when the speed reaches the target speed is estimated; According to the current speed difference, a second speed regulation time threshold T2 is determined, and when the estimated speed regulation time Treq is greater than the second speed regulation time threshold T2, it is determined to close the intermediate shaft brake, otherwise the intermediate shaft brake is kept open.

6. The method of claim 5, wherein, The first speed regulation time threshold T1 and the second speed regulation time threshold T2 are determined as follows: According to the current speed difference, a first speed regulation time threshold T1int and a second speed regulation time threshold T2int are calibrated; According to the temperature influence coefficient fac calibrated according to the gearbox oil temperature, the calibrated first speed regulation time threshold T1int and the calibrated second speed regulation time threshold T2int are corrected by fac to obtain the first speed regulation time threshold T1 and the second speed regulation time threshold T2.

7. The method of claim 1, wherein, The speed difference between the two ends of the coupling sleeve is obtained, comprising: The front end speed of the coupling sleeve nDiffF is obtained according to the intermediate shaft speed divided by the main gearbox transmission ratio; The rear end speed of the coupling sleeve nDiffR is obtained according to the output shaft speed multiplied by the range gear transmission ratio; The speed difference nDiff between the two ends of the coupling sleeve is obtained.

8. An intermediate shaft controller device, characterized by The device comprises: A speed difference determination module for collecting vehicle operation information and obtaining the speed difference between the two ends of the coupling sleeve when the intermediate shaft brake speed regulation condition is met; An interval determination module for comparing the current speed difference with the threshold values of different intervals to determine the interval of the speed difference; A direct control module for directly starting / closing the intermediate shaft brake when the intermediate shaft brake is closed and the speed difference is in the direct start interval / the intermediate shaft brake is started and the speed difference is in the direct close interval; A start observation module for determining whether to open the intermediate shaft brake according to whether the speed regulation time estimated according to the intermediate shaft speed change rate and the target speed meets the timeliness requirement when the intermediate shaft brake is closed and the speed difference is in the start observation interval; A close observation module for determining whether to close the intermediate shaft brake according to whether the speed regulation time estimated according to the intermediate shaft speed change rate and the target speed meets the timeliness requirement when the intermediate shaft brake is open and the speed difference is in the close observation interval.

9. A control apparatus of a countershaft brake characterized by comprising: Comprise: At least one processor; And a memory connected in communication with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method of any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium has stored therein a computer program for executing the method according to any one of claims 1-7 when executed by a computer.

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