Downshift control method, device, storage medium and apparatus based on slipping conditions

Abstract

The present invention discloses a downshift control method, device, storage medium, and apparatus based on a slipping condition. The present invention obtains a target gear position to be engaged and a current shift fork gear position of a target vehicle; determines a target shift fork gear engagement strategy based on the target gear position to be engaged and the current shift fork gear position; and controls the gear engagement operation of the target shift fork gear position based on the vehicle slipping condition and the target shift fork gear engagement strategy. Because the present invention utilizes high-throttle downshift logic under vehicle slipping conditions for adjustment, compared to prior art methods that exacerbate clutch slippage during high-throttle downshifts due to vehicle slippage, the present invention effectively addresses the issue of exacerbated clutch slippage during high-throttle downshifts, thereby improving the drivability of the vehicle during high-throttle downshifts.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a downshift control method, equipment, storage medium and device based on a slipping condition. Background Art

[0002] Because a dual-clutch transmission has two clutches, they work together without power interruption during gear shifts, enabling quick and smooth shifts. Upshifting and downshifting are common and fundamental driving conditions, and controlling them is a key aspect of a dual-clutch transmission. When the vehicle experiences slippage during a downshift under high throttle, engaging a gear becomes difficult. When the clutch remains in gear but cannot engage, it experiences constant slippage. This friction generates significant heat on the clutch plate, exacerbating clutch wear and shortening its lifespan.

[0003] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0004] The main purpose of the present invention is to provide a downshift control method, equipment, storage medium and device based on slip conditions, aiming to solve the technical problem in the prior art of increased clutch slippage due to vehicle slippage during high-throttle downshifting.

[0005] To achieve the above object, the present invention provides a downshift control method based on a slipping condition, the downshift control method based on a slipping condition comprising the following steps:

[0006] Obtain the target gear position to be engaged and the current shift fork position of the target vehicle;

[0007] Determining a target shift fork gear engagement strategy based on the target gear position to be engaged and the current shift fork gear position;

[0008] The gear shifting operation of the target shift fork gear position is controlled according to the vehicle slipping condition and the target shift fork gear shifting strategy.

[0009] Optionally, the step of determining a target fork gear engagement strategy according to the target gear position to be engaged and the current fork gear position includes:

[0010] determining whether the downshift type is a coaxial downshift according to the target gear position to be engaged and the current shift fork gear position;

[0011] When the downshift type is coaxial downshift, determining the shift fork position to be engaged according to the target gear position to be engaged and the current shift fork position;

[0012] A target shift fork gear engagement strategy is determined according to the first preset clutch state and the shift fork gear position to be engaged.

[0013] Optionally, the step of determining a target fork gear engagement strategy according to the first preset clutch state and the fork gear position to be engaged includes:

[0014] When the first preset clutch is in a speed regulating state, the engine speed is controlled to increase to a speed corresponding to the shift fork gear position to be engaged according to the torque corresponding to the first preset clutch;

[0015] If the second preset clutch enters the intermediate shaft speed regulation state of the coaxial multi-shift downshift working condition and the vehicle slips when the first preset clutch is gradually opened, the target shift fork gear is controlled to return to the neutral position and the gear shifting operation of the target shift fork gear is interrupted until the slipping working condition ends;

[0016] When the slipping condition ends, the shift fork gear is controlled to drop to the target shift fork gear.

[0017] Optionally, the step of determining a target fork gear engagement strategy according to the first preset clutch state and the fork gear position to be engaged includes:

[0018] When the vehicle slips while the first preset clutch is not in the speed regulation state, the target shift fork gear is controlled to return to the neutral position, and the first preset clutch is controlled to open;

[0019] If the shift fork is engaged in the neutral gear, the engine speed is increased to the speed corresponding to the neutral gear by controlling the torque corresponding to the second preset clutch, and the torque of the odd-numbered and even-numbered clutches is exchanged to complete the neutral gear engagement action until the slipping condition ends;

[0020] When the slipping condition ends, the shift fork gear is controlled to drop to the target shift fork gear.

[0021] Optionally, when the downshift type is a coaxial downshift, before the step of determining the fork gear position to be engaged according to the target gear position to be engaged and the current fork gear position, the method further includes:

[0022] If the downshift type is an off-axis downshift, the vehicle slips when the first preset clutch is controlled to downshift, the target gear shift command is prohibited, and the shift fork is controlled to stop the gear shifting action until the slipping condition ends;

[0023] When the slipping condition ends, the shift fork gear is controlled to drop to the target shift fork gear.

[0024] Optionally, before the step of controlling the gear shifting operation of the target shift fork gear position according to the vehicle slipping condition and the target shift fork gear shifting strategy, the method further includes:

[0025] Obtain vehicle driving information;

[0026] determining whether the vehicle is in a slipping condition based on the vehicle driving information;

[0027] When the vehicle is in a slipping condition, a step of controlling a gear shifting operation of a target shift fork gear position according to the vehicle slipping condition and the target shift fork gear shifting strategy is executed.

[0028] Optionally, the vehicle driving information includes anti-lock braking function activation information, traction control system activation information, and rear wheel speed difference information, and the step of determining whether the vehicle is in a slipping condition based on the vehicle driving information includes:

[0029] It is determined whether the vehicle is in a slipping condition according to the anti-lock braking function activation information, the traction control system activation information, and the rear wheel speed difference information.

[0030] In addition, to achieve the above-mentioned purpose, the present invention also proposes a downshift control device based on slipping conditions, wherein the downshift control device based on slipping conditions includes a memory, a processor, and a downshift control program based on slipping conditions stored in the memory and executable on the processor, wherein the downshift control program based on slipping conditions is configured to implement the steps of downshift control based on slipping conditions as described above.

[0031] In addition, to achieve the above-mentioned purpose, the present invention also proposes a storage medium, on which a downshift control program based on slipping conditions is stored. When the downshift control program based on slipping conditions is executed by a processor, the steps of the downshift control method based on slipping conditions as described above are implemented.

[0032] In addition, to achieve the above-mentioned object, the present invention further proposes a downshift control device based on a slipping condition, the downshift control device based on a slipping condition comprising:

[0033] An information acquisition module is used to obtain the target gear position to be engaged and the current shift fork gear position of the target vehicle;

[0034] a strategy determination module, configured to determine a target fork gear engagement strategy based on the target gear position to be engaged and the current fork gear position;

[0035] The downshift control module is used to control the gear shifting operation of the target shift fork gear position according to the vehicle slipping condition and the target shift fork gear shifting strategy.

[0036] The present invention obtains the target gear position to be engaged and the current shift fork gear position of the target vehicle; determines a target shift fork gear engagement strategy based on the target gear position to be engaged and the current shift fork gear position; and controls the gear engagement operation of the target shift fork gear position based on the vehicle slip condition and the target shift fork gear engagement strategy. Because the present invention utilizes the high-throttle downshift logic under vehicle slip conditions to make adjustments, compared to the prior art where clutch slip is exacerbated during high-throttle downshifts due to vehicle slip, the present invention effectively addresses the issue of exacerbated clutch slip during high-throttle downshifts, thereby improving the drivability of the vehicle during high-throttle downshifts. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 1 is a schematic structural diagram of a downshift control device based on a slipping condition in a hardware operating environment according to an embodiment of the present invention;

[0038] Figure 2 1 is a flow chart of a first embodiment of a downshift control method based on a slipping condition according to the present invention;

[0039] Figure 3 1 is a flow chart of a second embodiment of a downshift control method based on a slipping condition according to the present invention;

[0040] Figure 4 This is a flow chart of a first control condition for shifting from 3rd gear to 1st gear with a large throttle according to a second embodiment of the downshift control method based on a slipping condition of the present invention;

[0041] Figure 5 This is a schematic flow chart of a second control condition for shifting from 3rd gear to 1st gear with a large throttle, according to a second embodiment of the downshift control method based on a slipping condition of the present invention;

[0042] Figure 6 This is a schematic diagram of a control flow chart of shifting from 2nd gear to 1st gear with a high throttle according to a third embodiment of a downshift control method based on a slipping condition of the present invention;

[0043] Figure 7 This is a structural block diagram of the first embodiment of the downshift control device based on the slipping condition of the present invention.

[0044] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0045] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0046] Reference Figure 1 , Figure 1 This is a schematic structural diagram of a downshift control device based on a slipping condition in a hardware operating environment according to an embodiment of the present invention.

[0047] like Figure 1 As shown, the downshift control device based on the slipping condition may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to implement connection and communication between these components. The user interface 1003 may include a display screen. Optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. In the present invention, the wired interface of the user interface 1003 may be a USB interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a wireless fidelity (Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (RAM) or a non-volatile memory (NVM), such as a disk storage device. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0048] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation to the downshift control device based on the slipping condition, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0049] like Figure 1 As shown, the memory 1005 , which is identified as a computer storage medium, may include an operating system, a network communication module, a user interface module, and a downshift control program based on a slipping condition.

[0050] exist Figure 1 In the downshift control device based on slipping conditions shown, the network interface 1004 is mainly used to connect to the background server and communicate data with the background server; the user interface 1003 is mainly used to connect to the user device; the downshift control device based on slipping conditions calls the downshift control program based on slipping conditions stored in the memory 1005 through the processor 1001, and executes the downshift control method based on slipping conditions provided by the embodiment of the present invention.

[0051] Based on the above hardware structure, an embodiment of the downshift control method based on the slipping condition of the present invention is proposed.

[0052] Reference Figure 2 , Figure 2 1 is a flow chart of a first embodiment of a downshift control method based on a slipping condition according to the present invention, and provides a first embodiment of a downshift control method based on a slipping condition according to the present invention.

[0053] In this embodiment, the downshift control method based on the slipping condition includes the following steps:

[0054] Step S10: Obtain the target gear position to be engaged and the current shift fork gear position of the target vehicle.

[0055] It should be noted that the execution subject of this embodiment can be a device with a throttle downshift control function, such as an onboard computer, a computer, a laptop, a computer, or a tablet. It can also be other throttle downshift control devices that can achieve the same or similar functions, including transmission control systems, and can also remotely control the target vehicle, which is not limited in this embodiment. This embodiment and the following embodiments will be described using the above-mentioned onboard computer as an example.

[0056] It should be understood that this technical solution is directed to a method for optimizing the downshift logic of a wet dual-clutch transmission when the vehicle is downshifted by pressing the accelerator hard while driving, and the vehicle slips during the downshift to 1st gear process. The target gear to be engaged may be the gear to be engaged corresponding to the downshift information output when the driver presses the accelerator while driving, for example: downshifting from 3rd gear to 1st gear by pressing the accelerator hard, or downshifting from 2nd gear to 1st gear by pressing the accelerator hard. 1st gear is the target gear to be engaged. The shift fork may refer to the component on the transmission that shifts the intermediate gear wheel to change the input / output speed ratio. The shift fork is primarily used for clutch shifting, and the current shift fork gear position may refer to the gear currently engaged during the clutch shifting process.

[0057] In a specific implementation, when a vehicle slips, the downshift logic prohibits further downshifts to 1st gear. Simultaneously, the transmission's shift map is reselected, the target gear becomes 2nd gear, and the shift action is completed. This invention prevents prolonged clutch slippage and damage caused by a prolonged inability to engage 1st gear during a slip. This solution develops clutch control to prevent clutch slippage during high-throttle downshifts in slipping conditions. This requires first obtaining the target gear and current shift fork position of the target vehicle.

[0058] Step S20: determining a target shift fork gear engagement strategy according to the target gear position to be engaged and the current shift fork gear position.

[0059] It should be noted that the target fork gear shifting strategy can be determined from the dual-clutch downshift strategy based on the target gear to be engaged and the current fork gear position. For example: if the target gear is 1st gear, downshifting from 3rd gear to 1st gear is a coaxial downshift, which requires the use of an intermediate shaft, then the even-numbered shaft shift fork is engaged in 2nd gear. If the target gear is 1st gear, downshifting from 2nd gear to 1st gear is a non-coaxial downshift, and 1 gear can be directly downshifted.

[0060] It should be understood that, since downshifting by pressing the accelerator heavily during vehicle driving involves different downshifting strategies corresponding to coaxial downshifting and axial downshifting, it is necessary to determine the target fork gear shifting strategy based on the target gear to be engaged and the current fork gear position.

[0061] Step S30: controlling the gear shifting operation of the target shift fork gear position according to the vehicle slipping condition and the target shift fork gear shifting strategy.

[0062] It should be noted that the existing technology lacks a strategy for downshifting during high-throttle conditions when the vehicle is slipping. When the vehicle slips during high-throttle downshifting, it is difficult to engage a gear successfully. As the clutch remains in gear but cannot engage, it continues to slip. This slipping generates significant heat on the clutch plate, exacerbating clutch wear and shortening its lifespan. Therefore, a solution is needed to address the high-throttle downshift strategy during slip. This solution combines the vehicle's slipping condition with a target shift fork engagement strategy to control the vehicle's shift fork gear engagement.

[0063] It should be understood that the vehicle slip condition includes the time period when the vehicle slips and the shift fork gear engagement condition information during the slip, wherein the shift fork gear engagement condition information includes the shift fork engaged gear position and the shift fork gear engagement stage.

[0064] In the specific implementation, when downshifting with a large throttle, the gear is prohibited from being lowered to the target gear (such as 1st gear) when the vehicle is slipping. The control strategy for preventing clutch slippage controls the gear shifting operation of the target shift fork gear through the vehicle slippage condition and the target shift fork gear shifting strategy, so as to avoid the target gear being unable to be engaged for a long time during the slippage process, resulting in long-term clutch slippage and damage to the clutch.

[0065] Furthermore, before step S20, it also includes: obtaining vehicle driving information; determining whether the vehicle is in a slipping condition based on the vehicle driving information; and when the vehicle is in a slipping condition, executing the step of controlling the target shift fork gear position according to the vehicle slipping condition and the target shift fork shifting strategy.

[0066] It should be noted that the vehicle driving information includes the vehicle wheel speed, the driving information corresponding to the vehicle anti-lock braking system (such as ABS) and the traction control system (such as TCS). The operating condition information obtained by the vehicle anti-lock braking system and the traction control system can be used to determine whether the slip control strategy is activated when downshifting with a large throttle.

[0067] It should be understood that when the vehicle slip control strategy is activated, the step of controlling the gear shifting operation of the target fork gear position according to the vehicle slip condition and the target fork gear shifting strategy is executed, thereby achieving the effect of preventing clutch slip.

[0068] Furthermore, the vehicle driving information includes anti-lock braking function activation information, traction control system activation information and rear wheel speed difference information. The step of determining whether the vehicle is in a slipping condition based on the vehicle driving information includes: determining whether the vehicle is in a slipping condition based on the anti-lock braking function activation information, the traction control system activation information and the rear wheel speed difference information.

[0069] It should be noted that the anti-lock braking function activation information may refer to the information generated when the vehicle suddenly brakes and the ABS anti-lock braking system is activated to prevent loss of control; the traction control system activation information may refer to the information generated when the vehicle brakes on a slippery road, the wheels may slip, or even lose control, and the TCS traction control system is activated at this time; the rear wheel speed difference information may refer to the information when the difference in front and rear wheel speeds is always greater than a certain value within a certain period of time, for example: the wheel speed difference information when the vehicle is on a wet and muddy road and the wheels slip.

[0070] In specific implementation, the conditions for activating skidding during throttle downshifting include: (1) when the throttle is lowered from 3rd gear to 1st gear or from 2nd gear to 1st gear with high throttle; (2) when the TCS traction control system is activated and the vehicle brakes suddenly, the wheels will skid or even lose control of the direction, and the TCS traction control system will be activated; (3) when the speed difference between the front and rear wheels is always greater than a certain value within a certain period of time, the vehicle is on a wet and muddy road, and the wheels skid; if any of the above conditions is met, it means that the vehicle is in a skidding condition.

[0071] This embodiment obtains the target gear position to be engaged and the current shift fork position of the target vehicle; determines a target shift fork gear engagement strategy based on the target gear position to be engaged and the current shift fork gear position; and controls the gear engagement operation of the target shift fork gear position based on the vehicle slip condition and the target shift fork gear engagement strategy. Because this embodiment adjusts the high-throttle downshift logic under vehicle slip conditions, compared to the prior art where clutch slip is exacerbated during high-throttle downshifts due to vehicle slip, this embodiment effectively addresses the issue of exacerbated clutch slip during high-throttle downshifts, thereby improving the drivability of the vehicle during high-throttle downshifts.

[0072] Reference Figure 3 , Figure 3 This is a flow chart of the second embodiment of the downshift control method based on the slipping condition of the present invention. Figure 2 The first embodiment shown provides a second embodiment of the downshift control method based on the slipping condition of the present invention.

[0073] In this embodiment, step S20 includes:

[0074] Step S201: determining whether the downshift type is a coaxial downshift according to the target gear position to be engaged and the current shift fork gear position.

[0075] It should be noted that there are two types of downshifts: coaxial downshift and off-axis downshift. Coaxial downshift requires the use of an intermediate shaft. Therefore, the downshift type is determined by the target gear to be engaged and the current shift fork gear position to determine whether it is a coaxial downshift, and whether it is possible to downshift directly. For example: if the target gear is 1st gear, downshifting from 3rd gear to 1st gear is a coaxial downshift, which requires the use of an intermediate shaft, then the even-numbered shaft shift fork is engaged in 2nd gear. If the target gear is 1st gear, downshifting from 2nd gear to 1st gear is an off-axis downshift, and you can downshift directly by 1st gear.

[0076] Step S202: When the downshift type is coaxial downshift, the shift fork position to be engaged is determined according to the target gear position to be engaged and the current shift fork position.

[0077] It should be noted that when the downshift type is a coaxial downshift, the shift fork gear position to be engaged is determined based on the target gear to be engaged and the current shift fork gear position. The shift fork gear position to be engaged refers to the gear position required for the shift fork to be engaged with the help of the intermediate shaft. For example: if the target gear is 1st gear, shifting from 3rd gear to 1st gear is a coaxial downshift, which requires the help of the intermediate shaft, then the even-numbered shaft shift fork is engaged in 2nd gear, where the even-numbered shaft shift fork engaged in 2nd gear is the shift fork gear position to be engaged.

[0078] Step S203: determining a target shift fork gear engagement strategy according to the first preset clutch state and the shift fork gear position to be engaged.

[0079] It should be noted that the first pre-clutch state may refer to pre-set state information corresponding to the odd-numbered clutch, and the state information includes the speed regulation state corresponding to the odd-numbered clutch and the torque interaction state with the even-numbered clutch.

[0080] It should be understood that when the odd-numbered clutches are in different states, the shift fork gear engagement strategies are different, and therefore it is necessary to determine the target shift fork gear engagement strategy by combining the states of the odd-numbered clutches.

[0081] Furthermore, step S203 also includes: when the first preset clutch is in the speed regulation state, controlling the engine speed to increase to the speed corresponding to the shift fork gear to be engaged according to the torque corresponding to the first preset clutch; if the second preset clutch enters the intermediate shaft speed regulation state of the coaxial downshifting multi-gear working condition and the vehicle slips when the first preset clutch is gradually opened, controlling the target shift fork gear to return to the middle position, and interrupting the gear engagement operation of the target shift fork gear until the slipping condition ends; when the slipping condition ends, controlling the shift fork gear to drop to the target shift fork gear.

[0082] It should be noted that the second preset clutch may refer to a pre-set even-numbered clutch, and the state information includes the speed regulation state corresponding to the even-numbered clutch and the torque interaction state with the odd-numbered clutch.

[0083] It should be understood that the vehicle slipping condition may occur before the shift fork is engaged in gear and during the shift fork is engaged in gear, so the operation of engaging the shift fork in gear needs to be determined in combination with the stage at which the slipping condition occurs.

[0084] In the specific implementation, in order to further illustrate the control strategy of the slip condition occurring when the shift fork has been moved during the coaxial downshift process, refer to Figure 4 The diagram shows a process flow diagram of a high-throttle 3rd-to-1st gear control working condition, wherein (1) if the target gear is 1st gear, 3rd-to-1st gear is a coaxial downshift, which requires the aid of an intermediate shaft, and the even-numbered shaft shift fork is engaged in 2nd gear; (2) the odd-numbered clutch adjusts the speed, and the torque of the odd-numbered shaft controls the engine speed so that the engine speed gradually increases to the speed corresponding to 2nd gear; (3) the even-numbered clutch enters the coaxial multi-gear downshift working condition intermediate shaft speed adjustment state, the odd-numbered clutch gradually opens, and the odd-numbered shaft 3rd gear shift fork returns to the middle position to prepare for engaging in 1st gear; (4) if the vehicle slips at this time, the target gear returns to 2nd gear, interrupting the process of engaging in 1st gear; (5) the slipping condition ends, and the transmission can normally downshift by 1st gear.

[0085] Furthermore, step S203 also includes: when the vehicle slips when the first preset clutch is not in the speed regulation state, the target fork gear is controlled to return to the neutral position, and the first preset clutch is controlled to open; if the fork gear is engaged in the neutral gear, the engine speed is increased to the speed corresponding to the neutral gear by controlling the torque corresponding to the second preset clutch, and the odd-numbered and even-numbered clutches perform torque interaction to complete the neutral gear engagement action until the slip condition ends; when the slip condition ends, the fork gear is controlled to drop to the target fork gear.

[0086] In the specific implementation, in order to further illustrate the control strategy of the slip condition occurring when the shift fork is not moving during the coaxial downshift process, refer to Figure 5 The diagram of the second process flow of the control working condition of shifting from 3rd gear to 1st gear with high throttle is shown as follows: (1) If the target gear is 1st gear, shifting from 3rd gear to 1st gear is a coaxial downshift and requires the use of an intermediate shaft, so the even-numbered shaft shift fork is engaged in 2nd gear; (2) The odd-numbered clutch is ready for speed regulation. If the vehicle slips at this time, the target gear returns to 2nd gear and the odd-numbered clutch is opened; (3) The shift fork has been engaged in 2nd gear, and the engine speed is increased to the speed corresponding to 2nd gear through the torque control of the even-numbered clutch. Then the odd-numbered and even-numbered clutches perform torque interaction to complete the 2nd gear shifting action; (4) The slipping working condition ends and the transmission can shift down to 1st gear normally.

[0087] This embodiment obtains the target gear position to be engaged and the current shift fork position of the target vehicle; determines whether the downshift type is a coaxial downshift based on the target gear position to be engaged and the current shift fork position; if the downshift type is a coaxial downshift, determines the shift fork position to be engaged based on the target gear position to be engaged and the current shift fork position; determines a target shift fork gear engagement strategy based on a first preset clutch state and the shift fork gear position to be engaged; and controls the gear engagement operation of the target shift fork gear position based on the vehicle slip condition and the target shift fork gear engagement strategy. Because this embodiment adjusts the high-throttle downshift logic under vehicle slip conditions based on the downshift type, compared to the prior art in which clutch slip is aggravated during high-throttle downshifting due to vehicle slip, this embodiment effectively solves the problem of aggravated clutch slip due to vehicle slip during high-throttle downshifting, thereby improving the drivability of the vehicle during high-throttle downshifting.

[0088] Based on the above Figure 3 The second embodiment shown provides a third embodiment of the downshift control method based on the slipping condition of the present invention.

[0089] In this embodiment, before step S202, it also includes: if the downshift type is an off-axis downshift, controlling the vehicle to slip when the first preset clutch is downshifted, prohibiting the target gear shifting instruction from being issued, and controlling the shift fork to stop shifting gears until the slipping condition ends; when the slipping condition ends, controlling the shift fork gear position to drop to the target shift fork gear position.

[0090] It should be noted that the downshift type also includes off-axis downshift, and the first preset clutch may refer to a preset odd-numbered clutch.

[0091] In the specific implementation, in order to further illustrate the control strategy of the slip condition occurring when the shift fork is not moving during the downshift process of the different axes, refer to Figure 6 The diagram shows the process flow of the control condition of shifting from 2nd gear to 1st gear with high throttle, where (1) the target gear is 1st gear, and shifting from 2nd gear to 1st gear is an off-axis downshift, which can be directly downshifted to 1st gear; (2) the odd-numbered axle is in 1st gear, and slippage occurs at this time, and the command to shift to 1st gear is prohibited, and the target gear becomes 2nd gear; (3) the shift fork stops shifting gears and returns to the middle position; (4) the slippage condition ends, and the transmission can shift down to 1st gear normally.

[0092] This embodiment obtains the target gear position to be engaged and the current shift fork position of the target vehicle; determines whether the downshift type is a coaxial downshift based on the target gear position to be engaged and the current shift fork position; if the downshift type is a coaxial downshift, determines the shift fork position to be engaged based on the target gear position to be engaged and the current shift fork position; determines a target shift fork gear engagement strategy based on a first preset clutch state and the shift fork gear position to be engaged; and controls the gear engagement operation of the target shift fork gear position based on the vehicle slip condition and the target shift fork gear engagement strategy. Because this embodiment adjusts the high-throttle downshift logic under vehicle slip conditions based on the downshift type, compared to the prior art in which clutch slip is aggravated during high-throttle downshifting due to vehicle slip, this embodiment effectively solves the problem of aggravated clutch slip due to vehicle slip during high-throttle downshifting, thereby improving the drivability of the vehicle during high-throttle downshifting.

[0093] In addition, to achieve the above-mentioned purpose, the present invention also proposes a downshift control device based on slipping conditions, wherein the downshift control device based on slipping conditions includes a memory, a processor, and a downshift control program based on slipping conditions stored in the memory and executable on the processor, wherein the downshift control program based on slipping conditions is configured to implement the steps of downshift control based on slipping conditions as described above.

[0094] In addition, to achieve the above-mentioned purpose, the present invention also proposes a storage medium, on which a downshift control program based on slipping conditions is stored. When the downshift control program based on slipping conditions is executed by a processor, the steps of the downshift control method based on slipping conditions as described above are implemented.

[0095] Reference Figure 7 , Figure 7 This is a structural block diagram of the first embodiment of the downshift control device based on the slipping condition of the present invention.

[0096] like Figure 7 As shown, the downshift control device based on the slipping condition proposed in the embodiment of the present invention includes:

[0097] The information acquisition module 10 is used to obtain the target gear position to be engaged and the current shift fork gear position of the target vehicle;

[0098] A strategy determination module 20 is configured to determine a target fork gear engagement strategy based on the target gear position to be engaged and the current fork gear position;

[0099] The downshift control module 30 is used to control the gear shifting operation of the target shift fork gear position according to the vehicle slipping condition and the target shift fork gear shifting strategy.

[0100] This embodiment obtains the target gear position to be engaged and the current shift fork position of the target vehicle; determines a target shift fork gear engagement strategy based on the target gear position to be engaged and the current shift fork gear position; and controls the gear engagement operation of the target shift fork gear position based on the vehicle slip condition and the target shift fork gear engagement strategy. Because this embodiment adjusts the high-throttle downshift logic under vehicle slip conditions, compared to the prior art where clutch slip is exacerbated during high-throttle downshifts due to vehicle slip, this embodiment effectively addresses the issue of exacerbated clutch slip during high-throttle downshifts, thereby improving the drivability of the vehicle during high-throttle downshifts.

[0101] Furthermore, the strategy determination module 20 is also used to determine whether the downshift type is a coaxial downshift based on the target gear to be engaged and the current fork gear position; when the downshift type is a coaxial downshift, the fork gear position to be engaged is determined based on the target gear to be engaged and the current fork gear position; and the target fork gear engagement strategy is determined based on the first preset clutch state and the fork gear position to be engaged.

[0102] Furthermore, the strategy determination module 20 is also used to control the engine speed to increase to the speed corresponding to the shift fork gear to be engaged according to the torque corresponding to the first preset clutch when the first preset clutch is in the speed regulation state; if the second preset clutch enters the intermediate shaft speed regulation state of the coaxial downshifting multi-gear working condition and the vehicle slips when the first preset clutch is gradually opened, the target shift fork gear is controlled to return to the middle position and the gear engagement operation of the target shift fork gear is interrupted until the slipping condition ends; when the slipping condition ends, the shift fork gear is controlled to drop to the target shift fork gear.

[0103] Furthermore, the strategy determination module 20 is also used to control the target fork gear to return to the neutral position and control the first preset clutch to open when the vehicle slips when the first preset clutch is not in the speed regulation state; if the fork gear is engaged in the neutral gear, the engine speed is increased to the speed corresponding to the neutral gear by controlling the torque corresponding to the second preset clutch, and the odd-numbered and even-numbered clutches perform torque interaction to complete the neutral gear shifting action until the slipping condition ends; at the end of the slipping condition, the fork gear is controlled to drop to the target fork gear.

[0104] Furthermore, the strategy determination module 20 is also used to control the vehicle to slip when the first preset clutch downshifts if the downshift type is an off-axis downshift, prohibit the issuance of a target gear shifting instruction, and control the shift fork to stop shifting gears until the slipping condition ends; when the slipping condition ends, control the shift fork gear to drop to the target shift fork gear.

[0105] Furthermore, the downshift control device based on the slipping condition also includes a condition identification module, which is used to obtain vehicle driving information; determine whether the vehicle is in a slipping condition based on the vehicle driving information; and when the vehicle is in a slipping condition, execute the steps of controlling the gear shifting operation of the target fork gear position based on the vehicle slipping condition and the target fork gear shifting strategy.

[0106] Furthermore, the operating condition identification module is further configured to determine whether the vehicle is in a slipping condition based on the anti-lock braking function activation information, the traction control system activation information, and the rear wheel speed difference information.

[0107] It should be understood that the above is only an example and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can make settings as needed, and the present invention does not impose any limitation on this.

[0108] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of the present invention. In practical applications, technicians in this field can select part or all of it according to actual needs to achieve the purpose of the embodiment scheme, and no limitation is made here.

[0109] In addition, for technical details not fully described in this embodiment, reference can be made to the downshift control method based on the slipping condition provided in any embodiment of the present invention, and will not be repeated here.

[0110] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0111] The serial numbers of the embodiments of the present invention are for descriptive purposes only and do not represent superiority or inferiority of the embodiments. In a unit claim that enumerates several means, several of these means may be embodied by the same item of hardware. The use of the terms first, second, and third, etc., does not denote any order; these terms should be interpreted as designations.

[0112] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus the necessary general hardware platform, or of course by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory image (ROM) / random access memory (RAM), a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0113] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A downshift control method based on a slipping condition, characterized in that: The downshift control method based on the slipping condition comprises the following steps: Obtain the target gear position to be engaged and the current shift fork position of the target vehicle; Determining a target shift fork gear engagement strategy based on the target gear position to be engaged and the current shift fork gear position; controlling the gear shifting operation of the target shift fork gear position according to the vehicle slipping condition and the target shift fork gear shifting strategy; The step of determining a target shift fork gear engagement strategy based on the target gear position to be engaged and the current shift fork gear position includes: determining whether the downshift type is a coaxial downshift according to the target gear position to be engaged and the current shift fork gear position; When the downshift type is coaxial downshift, determining the shift fork position to be engaged according to the target gear position to be engaged and the current shift fork position; determining a target shift fork gear engagement strategy according to a first preset clutch state and the shift fork gear position to be engaged; When the first preset clutch is in a speed regulating state, the engine speed is controlled to increase to a speed corresponding to the shift fork gear position to be engaged according to the torque corresponding to the first preset clutch; If the second preset clutch enters the intermediate shaft speed regulation state of the coaxial multi-shift downshift working condition and the vehicle slips when the first preset clutch is gradually opened, the target shift fork gear is controlled to return to the neutral position and the gear shifting operation of the target shift fork gear is interrupted until the slipping working condition ends; When the slipping condition ends, the shift fork gear is controlled to drop to the target shift fork gear.

2. The downshift control method based on slipping conditions according to claim 1, characterized in that: The step of determining a target shift fork gear engagement strategy according to the first preset clutch state and the shift fork gear position to be engaged comprises: When the vehicle slips while the first preset clutch is not in the speed regulation state, the target shift fork gear is controlled to return to the neutral position, and the first preset clutch is controlled to open; If the shift fork is engaged in the neutral gear, the engine speed is increased to the speed corresponding to the neutral gear by controlling the torque corresponding to the second preset clutch, and the torque of the odd-numbered and even-numbered clutches is exchanged to complete the neutral gear engagement action until the slipping condition ends; When the slipping condition ends, the shift fork gear is controlled to drop to the target shift fork gear.

3. The downshift control method based on slipping conditions according to claim 2, characterized in that: Before the step of determining the shift fork position to be engaged according to the target gear position to be engaged and the current shift fork position when the downshift type is coaxial downshift, the method further includes: If the downshift type is an off-axis downshift, the vehicle slips when the first preset clutch is controlled to downshift, the target gear shift command is prohibited, and the shift fork is controlled to stop the gear shifting action until the slipping condition ends; When the slipping condition ends, the shift fork gear is controlled to drop to the target shift fork gear.

4. The downshift control method based on slipping conditions according to claim 1, characterized in that: Before the step of controlling the gear shifting operation of the target shift fork gear position according to the vehicle slipping condition and the target shift fork gear shifting strategy, the method further includes: Obtain vehicle driving information; determining whether the vehicle is in a slipping condition based on the vehicle driving information; When the vehicle is in a slipping condition, a step of controlling a gear shifting operation of a target shift fork gear position according to the vehicle slipping condition and the target shift fork gear shifting strategy is executed.

5. The downshift control method based on slipping conditions according to claim 4, characterized in that: The vehicle driving information includes anti-lock braking function activation information, traction control system activation information, and rear wheel speed difference information. The step of determining whether the vehicle is in a slipping condition based on the vehicle driving information includes: It is determined whether the vehicle is in a slipping condition according to the anti-lock braking function activation information, the traction control system activation information, and the rear wheel speed difference information.

6. A downshift control device based on a slipping condition, characterized in that: The downshift control device based on the slipping condition includes: a memory, a processor, and a downshift control program based on the slipping condition stored in the memory and executable on the processor. When the downshift control program based on the slipping condition is executed by the processor, the downshift control method based on the slipping condition as described in any one of claims 1 to 5 is implemented.

7. A storage medium, characterized in that: The storage medium stores a downshift control program based on a slipping condition, and when the downshift control program based on a slipping condition is executed by the processor, the downshift control method based on a slipping condition according to any one of claims 1 to 5 is implemented.

8. A downshift control device based on slipping conditions, characterized in that: The downshift control device based on the slipping condition includes: An information acquisition module is used to obtain the target gear position to be engaged and the current shift fork gear position of the target vehicle; a strategy determination module, configured to determine a target fork gear engagement strategy based on the target gear position to be engaged and the current fork gear position; a downshift control module, configured to control a gear shift operation of a target shift fork gear position according to a vehicle slip condition and the target shift fork gear shift strategy; The strategy determination module is also used to determine whether the downshift type is a coaxial downshift based on the target gear to be engaged and the current fork gear; when the downshift type is a coaxial downshift, the fork gear to be engaged is determined based on the target gear to be engaged and the current fork gear; the target fork gear engagement strategy is determined based on the first preset clutch state and the fork gear to be engaged; when the first preset clutch is in a speed regulation state, the engine speed is controlled to increase to the speed corresponding to the fork gear to be engaged based on the torque corresponding to the first preset clutch; if the second preset clutch enters the intermediate shaft speed regulation state of the coaxial downshift multi-gear working condition and the vehicle slips when the first preset clutch gradually opens, the target fork gear is controlled to return to the middle position, and the gear engagement operation of the target fork gear is interrupted until the slip condition ends; when the slip condition ends, the fork gear is controlled to drop to the target fork gear.

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