Pneumatic AMT vehicle TB activation time calculation method, system and device and storage medium

Abstract

The invention discloses a pneumatic AMT vehicle TB activation time calculation method, system and device and a storage medium, and mainly relates to the technical field of vehicle parameter calculation. Comprising the following steps: acquiring TB slopes under different service lives and gearbox temperatures of TB; weighting according to the change rate of the vehicle rotating speed signal and the bench test TB slope to obtain a final TB slope; according to the rotating speed difference needed by actual gear engaging of the sliding sleeve in the gearbox, a gear-entering window of the pneumatic gear shifting mechanism is calculated; and calculating TB activation time according to the pre-estimated shift-in window and the final TB slope. The method has the beneficial effects that the TB activation time can be accurately calculated, belt braking or negative rotation speed differential gear entering is avoided, and then the AMT gear shifting comfort is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle parameter calculation, and in particular to a method, system, device and storage medium for calculating TB activation time of a pneumatic AMT vehicle. Background Art

[0002] For pneumatic AMT transmissions, the shift control logic of the entire system is issued by the TCU operation. During the shifting process, the engine is first controlled to reduce torque, the clutch is disengaged, and then the shifting operation is performed. After the shifting is completed, the clutch is engaged, and finally the torque is returned. Among them, the shifting operation includes returning to idle, TB braking and shifting. TB is the countershaft brake. In this process, after returning to idle, it is necessary to wait for the input shaft speed to drop to the appropriate size before shifting. The TB braking can quickly reduce the input shaft speed to meet the shifting window, that is, the speed difference between the main shaft sleeve inside the transmission and the target gear gear, thereby greatly shortening the time from returning to idle to shifting.

[0003] The gearbox shifting is a key part of the entire gear shifting action. The speed difference during gear shifting should not be too large or too small. If the gear shifting timing is unreasonable, a large speed difference during gear shifting will cause the gearbox to hit the gears and damage the gears, while a small speed difference will cause the gears to hit the gears, causing the secondary gear shifting and increasing the gear shifting time. The pneumatic AMT gearbox actuator relies on the air pressure difference to operate. Due to the compressibility of air, there is still a certain braking slope after the TB valve is closed, which has a great impact on the change of the speed difference. In addition, there is a certain delay from activating the gear solenoid valve to the actuator action. Therefore, the calculation of the TB activation time of the pneumatic AMT gearbox should be closely related to the speed difference when the gear solenoid valve is engaged. An unreasonable TB activation time will cause gears to hit the gears or engage with a negative speed difference, resulting in poor gear shifting comfort.

[0004] Therefore, there is an urgent need for a TB activation time calculation method, system, device and storage medium for a pneumatic AMT vehicle to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a method, system, device and storage medium for calculating the TB activation time of a pneumatic AMT vehicle, which can accurately calculate the TB activation time, avoid shifting with braking or negative speed difference, and thus improve the comfort of AMT shifting.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] On the one hand, a method for calculating the TB activation time of a pneumatic AMT vehicle is provided, comprising the following steps:

[0008] S1: Obtain the TB slope at different TB life and gearbox temperature;

[0009] S2: The final TB slope is obtained by weighting the change rate of the vehicle speed signal and the TB slope of the bench test;

[0010] S3: Calculate the gear-entry window of the pneumatic shift mechanism according to the speed difference required for the actual gear shifting of the internal sleeve of the gearbox;

[0011] S4: Calculate the TB activation time based on the estimated shift window and the final TB slope.

[0012] Preferably, the step S1 of obtaining the TB slope at different TB lifespans and gearbox temperatures specifically includes the following steps:

[0013] The gearbox is mounted on the test bench in a rear-drive mode, with the output shaft driven by the motor;

[0014] The room temperature of the gearbox is 25 degrees, the motor is set to 30 to 40 rpm according to the actual situation, and the gearbox is in first gear;

[0015] Increase the motor speed according to the first gear ratio, so that the input shaft speed is increased to 2000r / min;

[0016] Activate the gear position and return to empty position. Return to empty position and activate the TB solenoid valve at the same time. The activation time is 150ms.

[0017] The input shaft speed reduction is collected 100ms after TB activation, and the TB slope is calculated.

[0018] The motor speed was reduced to 30 to 40 rpm, and the test was repeated 5 times to calculate the average TB slope.

[0019] After the room temperature test is completed, the gearbox is heated to 60 degrees and the TB slope at 60 degrees is tested;

[0020] The TB slope of TB friction plates at different lifespans was tested respectively.

[0021] Preferably, the tested TB friction plates have different life spans of 0-600,000 times, and are tested every 100,000 times.

[0022] Preferably, the TB slope calculation comprises:

[0023] Input the gearbox oil temperature and the current TB lifespan, and use the linear interpolation method to look up the table to obtain the gearbox test bench TB slope;

[0024] Obtain the speed sensor signal and use the average value method to calculate the current input shaft speed slope;

[0025] The gearbox bench TB slope and the current input shaft speed slope are weighted and summed to obtain the final TB slope.

[0026] Preferably, the weighted sum of the gearbox stand TB slope and the current input shaft speed slope is specifically:

[0027] Ngrdtl=ω*Ngrdt0+(1-ω)*Ngrdt

[0028] The weight ω is obtained by looking up a two-dimensional table, the input is the transmission oil temperature and the TB activation time, and the output is obtained by calibration based on the empirical method.

[0029] Preferably, the gear-entry window estimation includes:

[0030] Obtain the gear-in speed difference between the gear ring and the sleeve of the gearbox main shaft;

[0031] Get the response time of the actuator, which is the time from the issuance of the shift solenoid valve command to the start of the actuator action;

[0032] Calculates the estimated shift window based on the current input shaft slope.

[0033] Preferably, the TB activation time calculation includes:

[0034] Get the current input shaft speed;

[0035] Calculating a target input shaft speed based on an estimated shift window;

[0036] Input the current input shaft speed and target speed, integrate according to the TB slope, and calculate the TB activation time.

[0037] On the other hand, we also provide a TB activation time calculation system for pneumatic AMT vehicles, including:

[0038] Data acquisition module, used to: obtain current TB life, gearbox temperature, input shaft and output shaft speed;

[0039] The data processing module is used to: obtain the final TB slope by weighting the rate of change of the vehicle speed signal and the TB slope of the bench test; calculate the pneumatic shift mechanism entry window according to the speed difference required for the actual gear shifting of the internal sleeve of the gearbox; calculate the TB activation time according to the estimated entry window and the final TB slope;

[0040] Data output module, used to: output calculation results.

[0041] On the other hand, a device for calculating the TB activation time of a pneumatic AMT vehicle is also provided, comprising a processor and a memory for storing a computer program, wherein when the processor executes the computer program, the steps of the method described in any one of claims 1 to 7 are implemented.

[0042] On the other hand, a computer-readable storage medium is also provided, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by one or more processors, the steps of the method according to any one of claims 1 to 7 are implemented.

[0043] Compared with the prior art, the beneficial effects of the present invention are:

[0044] The TB activation time calculation method proposed in the present invention can accurately calculate the TB activation time, avoid shifting with braking or negative speed difference, make the shift speed window more reasonable, reduce the probability of secondary shifting, and improve the comfort of AMT shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a flow chart of the method of the present invention.

[0046] Figure 2 It is a test flow diagram of the gearbox bench TB test of the present invention.

[0047] Figure 3 It is a schematic diagram of the system structure of the present invention. DETAILED DESCRIPTION

[0048] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the application equally.

[0049] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention and should not be understood as limitations on the present invention.

[0050] In the present invention, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field can determine the specific meanings of the above terms in the present invention according to specific circumstances, and they should not be understood as limiting the present invention.

[0051] Example:

[0052] like Figure 1 As shown, this embodiment provides a method for calculating the TB activation time of a pneumatic AMT vehicle, comprising the following steps:

[0053] S1: TB test on a gearbox bench, recording the TB slope at different TB lifespans and gearbox temperatures; the different TB lifespans are 0 to 600,000 times, and the gearbox temperature is 25 to 60 degrees;

[0054] S2: TB slope calculation, the final TB slope is obtained by weighting the change rate of the actual speed signal and the TB slope of the bench test;

[0055] S3: Estimation of the gear shift window, which is to calculate the gear shift window of the pneumatic shift mechanism according to the speed difference required for the actual gear shifting of the internal sleeve of the gearbox; the speed difference is obtained based on actual testing and experience calibration;

[0056] S4: TB activation time calculation, the TB activation time is calculated according to the estimated gear-in window and the final TB slope.

[0057] The gearbox bench TB test is measured according to certain test methods, such as Figure 2 As shown, the specific process is as follows:

[0058] The gearbox is mounted on the test bench in a rear-drive mode, with the output shaft driven by the motor;

[0059] The room temperature of the gearbox is 25 degrees, the motor is set to 30 to 40 rpm according to the actual situation, and the gearbox is in first gear;

[0060] Increase the motor speed according to the first gear ratio, so that the input shaft speed is increased to 2000r / min;

[0061] Activate the gear position and return to empty position. Return to empty position and activate the TB solenoid valve at the same time. The activation time is 150ms.

[0062] The input shaft speed reduction is collected 100ms after TB activation, and the TB slope is calculated.

[0063] The motor speed was reduced to 30 to 40 rpm, and the test was repeated 5 times to calculate the average TB slope.

[0064] After the room temperature test is completed, the gearbox is heated to 60 degrees and the TB slope at 60 degrees is tested;

[0065] According to the above test process, the TB slope of the TB friction plate is tested from 0 to 600,000 times, and the test is performed every 100,000 times, and the test results are recorded.

[0066] In this embodiment, the TB slope calculation includes:

[0067] Input the gearbox oil temperature and the current TB life times, and use the linear interpolation method to look up the table to obtain the gearbox test bench TB slope Ngrdt0;

[0068] Obtain the speed sensor signal and use the average value method to calculate the current input shaft speed slope Ngrdt;

[0069] The gearbox bench TB slope and the current input shaft speed slope are weighted and summed to obtain the final TB slope Ngrdtl:

[0070] Ngrdtl=ω*Ngrdt0+(1-ω)*Ngrdt

[0071] The weight ω is obtained by looking up a two-dimensional table, the input is the transmission oil temperature and the TB activation time, and the output is obtained by calibration based on the empirical method.

[0072] In this embodiment, the gear-entry window estimation includes:

[0073] Get the gear speed difference Ndog0 between the gearbox main shaft gear ring and the sliding sleeve;

[0074] Get the response time of the actuator, which is the time t0 from the issuance of the shift solenoid valve command to the start of the actuator action;

[0075] Calculate the estimated gear shift window Ndog according to the current input shaft slope;

[0076] Ndog=Ngrdt / w0 / w1*t0+Ndog0

[0077] Among them, w0 and w1 are the gearbox constant meshing speed ratio and the target gear main box speed ratio respectively.

[0078] In some embodiments, the TB activation time calculation includes:

[0079] Get the current input shaft speed Noutpu;

[0080] Calculate the target input shaft speed Ninput_tgt based on the estimated shift window;

[0081] Ninput_tgt=(Noutput*w2+Ndog)*w1*w0

[0082] Among them, Noutput is the output shaft speed, and w2 is the gear ratio of the transmission range.

[0083] The current input shaft speed and target speed are input, and the TB residual braking time is taken into account. The TB activation time t is calculated according to the following formula based on the TB slope integration:

[0084]

[0085] Among them, t1 is the residual braking time after the TB ends, which can be calibrated to a specific value according to the actual TB valve test conditions.

[0086] In the present invention, the activation of TB takes into account the response time of the pneumatic actuator and the residual braking time of the TB valve, which can avoid shifting with braking, greatly reduce the probability of hitting the gear, and improve the comfort of gear shifting.

[0087] like Figure 3 As shown, this embodiment also provides a TB activation time calculation system for a pneumatic AMT vehicle, including:

[0088] Data acquisition module, used to obtain current TB life, gearbox temperature, input shaft and output shaft speed, etc.;

[0089] The data processing module is used to: obtain the final TB slope by weighting the rate of change of the vehicle speed signal and the TB slope of the bench test; calculate the pneumatic shift mechanism entry window according to the speed difference required for the actual gear shifting of the internal sleeve of the gearbox; calculate the TB activation time according to the estimated entry window and the final TB slope;

[0090] Data output module, used to: output calculation results.

[0091] The contents of the above method embodiments are all applicable to the present system embodiments. The functions specifically implemented by the present system embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0092] The present invention also provides a device, comprising:

[0093] at least one processor;

[0094] At least one memory for storing at least one program;

[0095] When the at least one program is executed by at least one processor, the at least one processor implements a method for calculating the TB activation time of a pneumatic AMT vehicle.

[0096] The contents of the above method embodiments are all applicable to the present device embodiments. The functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0097] In some optional embodiments, the embodiments presented and described in the steps of the present invention are provided by way of example, with the purpose of providing a more comprehensive understanding of the technology. The disclosed method is not limited to the operations and logical flows presented herein. Optional embodiments are contemplated in which the order of various operations is changed and in which sub-operations described as part of a larger operation are performed independently.

[0098] In addition, although the present invention is described in the context of functional modules, it should be understood that, unless otherwise specified to the contrary, one or more of the functions and / or features described may be integrated into a single physical device and / or software module, or one or more functions and / or features may be implemented in a separate physical device or software module. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding the present invention. More specifically, in view of the properties, functions, and internal relationships of the various functional modules in the device disclosed herein, the actual implementation of the module will be understood within the conventional skills of the engineer. It is also understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present invention, which is determined by the full scope of the appended claims and their equivalents.

[0099] An embodiment of the present invention further provides a storage medium, wherein the storage medium stores a program, and the program is executed by a processor to complete a method for calculating the TB activation time of a pneumatic AMT vehicle.

[0100] It can also be seen that the contents in the above method embodiments are all applicable to the present storage medium embodiments, and the functions and beneficial effects achieved are the same as those in the method embodiments.

[0101] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0102] The logic and / or steps represented in the embodiments or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses.

[0103] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0104] In the description of this specification, the description with reference to the terms "one embodiment", "this embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0105] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A method for calculating the TB activation time of a pneumatic AMT vehicle, characterized in that: The following steps are involved: S1: Obtain the TB slope at different TB life and gearbox temperature; S2: The final TB slope is obtained by weighting the change rate of the vehicle speed signal and the TB slope of the bench test; S3: Calculate the gear-entry window of the pneumatic shift mechanism according to the speed difference required for the actual gear shifting of the internal sleeve of the gearbox; S4: Calculate the TB activation time based on the estimated shift window and the final TB slope.

2. The method for calculating the TB activation time of a pneumatic AMT vehicle according to claim 1, characterized in that: The step S1 of obtaining the TB slope under different TB life and gearbox temperature specifically includes the following steps: The gearbox is mounted on the test bench in a rear-drive mode, with the output shaft driven by the motor; The room temperature of the gearbox is 25 degrees, the motor is set to 30 to 40 rpm according to the actual situation, and the gearbox is in first gear; Increase the motor speed according to the first gear ratio, so that the input shaft speed is increased to 2000r / min; Activate the gear position and return to empty position. Return to empty position and activate the TB solenoid valve at the same time. The activation time is 150ms. The input shaft speed reduction is collected 100ms after TB activation, and the TB slope is calculated. The motor speed was reduced to 30 to 40 rpm, and the test was repeated 5 times to calculate the average TB slope. After the room temperature test is completed, the gearbox is heated to 60 degrees and the TB slope at 60 degrees is tested; The TB slope of TB friction plates at different lifespans was tested respectively.

3. The method for calculating the TB activation time of a pneumatic AMT vehicle according to claim 1, characterized in that: The tested TB friction plates have different life spans from 0 to 600,000 times, and are tested every 100,000 times.

4. The method for calculating the TB activation time of a pneumatic AMT vehicle according to claim 1, characterized in that: The TB slope calculation includes: Input the gearbox oil temperature and the current TB lifespan, and use the linear interpolation method to look up the table to obtain the gearbox test bench TB slope; Obtain the speed sensor signal and use the average value method to calculate the current input shaft speed slope; The gearbox bench TB slope and the current input shaft speed slope are weighted and summed to obtain the final TB slope.

5. The method for calculating the TB activation time of a pneumatic AMT vehicle according to claim 1, characterized in that: The weighted sum of the gearbox test bench TB slope and the current input shaft speed slope is specifically: Ngrdtl=ω*Ngrdt0+(1-ω)*Ngrdt The weight ω is obtained by looking up a two-dimensional table, the input is the transmission oil temperature and the TB activation time, and the output is obtained by calibration based on the empirical method.

6. The method for calculating the TB activation time of a pneumatic AMT vehicle according to claim 1, characterized in that: The gear-entry window estimation includes: Obtain the gear-in speed difference between the gear ring and the sleeve of the gearbox main shaft; Get the response time of the actuator, which is the time from the issuance of the shift solenoid valve command to the start of the actuator action; Calculates the estimated shift window based on the current input shaft slope.

7. The method for calculating the TB activation time of a pneumatic AMT vehicle according to claim 1, characterized in that: The TB activation time calculation includes: Get the current input shaft speed; Calculating a target input shaft speed based on an estimated shift window; Input the current input shaft speed and target speed, integrate according to the TB slope, and calculate the TB activation time.

8. TB activation time calculation system for pneumatic AMT vehicles, characterized in that: include: Data acquisition module, used to: obtain current TB life, gearbox temperature, input shaft and output shaft speed; The data processing module is used to: obtain the final TB slope by weighting the rate of change of the vehicle speed signal and the TB slope of the bench test; calculate the pneumatic shift mechanism entry window according to the speed difference required for the actual gear shifting of the internal sleeve of the gearbox; calculate the TB activation time according to the estimated entry window and the final TB slope; Data output module, used to: output calculation results.

9. A device for calculating the TB activation time of a pneumatic AMT vehicle, characterized in that: The method comprises a processor and a memory for storing a computer program, wherein when the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by one or more processors, the steps of the method according to any one of claims 1 to 7 are implemented.

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