Tractor gearbox shift control system, method, device and tractor

Abstract

The present invention relates to a gearbox shift control system, method, device and tractor for a tractor, and belongs to the technical field of tractor control. The system includes a starting clutch, a gearbox and a controller arranged on the tractor, wherein the starting clutch is controlled by a proportional solenoid valve, and the gearbox includes a plurality of gear clutches, each gear clutch is controlled by a switch solenoid valve, and the proportional solenoid valve and each switch solenoid valve are connected to the controller; the controller is used to obtain the operating parameter information of the tractor in real time; judge whether the current gear of the gearbox of the tractor meets the automatic shifting condition; if the automatic shifting condition is met, a control strategy is generated based on the operating parameter information and a preset control rule, and the operating state of the proportional solenoid valve and at least one switch solenoid valve of the gearbox is controlled based on the control strategy, so that the current gear of the gearbox is switched to the target gear. The slipping phenomenon of the clutch during the gear shifting process is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of tractor control, and in particular to a gearbox shift control system, method, equipment and tractor of a tractor. Background Art

[0002] In the process of modern agricultural mechanization, tractors, as key power equipment, are widely used in various traction operations such as plowing, rotary tillage and cargo transportation. With the continuous development of agricultural production and the improvement of efficiency requirements, tractors need to withstand higher workloads, especially when performing heavy-load operations, which puts more stringent requirements on the performance and reliability of automatic transmissions.

[0003] In traditional tractor automatic transmissions, the clutch is mostly controlled by a proportional solenoid valve. Although this control method can achieve smooth engagement and disengagement of the clutch to a certain extent, the response speed and accuracy of the proportional solenoid valve are often difficult to meet the requirements under high-load and high-frequency shifting operating conditions, resulting in obvious slippage of the clutch during the shifting process. Slippage not only increases the wear of the clutch and reduces the service life of the transmission, but also increases energy consumption and emissions, which has an adverse effect on the overall performance of the tractor. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a transmission shift control system, method, device and tractor for a tractor, aiming to solve at least one of the above technical problems.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] In a first aspect, the present application provides a gearbox shift control system for a tractor, which adopts the following technical solution:

[0007] A gearbox shift control system for a tractor, comprising a starting clutch, a gearbox and a controller arranged on the tractor, wherein the starting clutch is controlled by a proportional solenoid valve, the gearbox comprises a plurality of gear clutches, each of the gear clutches is controlled by a switch solenoid valve, and the proportional solenoid valve and each of the switch solenoid valves are connected to the controller;

[0008] The controller is used to obtain the operating parameter information and load information of the tractor in real time, the operating parameter information including the current gear position of the gearbox and the current speed of the engine, and determine the target gear position corresponding to the current speed;

[0009] Determining whether the current gear position of the gearbox of the tractor meets the automatic gear shifting condition;

[0010] If the current gear of the gearbox of the tractor meets the automatic gear shifting condition, a control strategy is generated based on the operating parameter information and a preset control rule, and the operating states of the proportional solenoid valve and at least one switch solenoid valve of the gearbox are controlled based on the control strategy to switch the current gear of the gearbox to a target gear. The control strategy is a first control strategy for controlling the proportional solenoid valve and the switch solenoid valve corresponding to the target gear, or a second control strategy for controlling the proportional solenoid valve, the switch solenoid valve corresponding to the current gear, and the switch solenoid valve corresponding to the target gear.

[0011] The beneficial effects of the present invention are as follows: the system uses a switch solenoid valve to control the gear clutch, and the switch solenoid valve can minimize the gear shifting time, reduce clutch slippage, and increase the service life of the gearbox during the gear shifting process. By acquiring the operating parameter information of the tractor in real time (such as the current gear of the gearbox, the target gear corresponding to the current speed of the engine, and the load information of the tractor), the system can more accurately determine the timing of the gear shift, thereby improving the efficiency and smoothness of the gear shifting. By determining the control strategy of the gear shifting according to the load, current gear and target gear of the tractor, and performing the gear shifting according to the control strategy, the impact during the gear shifting process can be effectively reduced, and the gear shifting efficiency and driving comfort can be improved.

[0012] Based on the above technical solution, the present invention can also be improved as follows.

[0013] Furthermore, the controller generates a control strategy based on the operating parameter information and the preset control rules, and the processing process includes:

[0014] Determining whether the current gear is a first set gear and whether the target gear is a second set gear, the first set gear being a neutral gear, the neutral gear representing a gear when the gearbox is in a state of no power output, the second set gear being a forward gear or a reverse gear, the forward gear representing a gear when the tractor is controlled to travel forward, and the reverse gear representing a gear when the tractor is controlled to travel backward;

[0015] If the current gear is the first set gear and the target gear is the second set gear, a first control strategy is generated based on the current gear and the target gear, wherein the first control strategy is a strategy for controlling the operating states of the proportional solenoid valve and the switch solenoid valve corresponding to the target gear based on a preset first control mode;

[0016] If the current gear is not the first set gear and the target gear is the second set gear, a second control strategy is generated based on the current gear, the target gear and the load information. The second control strategy is a strategy for controlling the operating states of the proportional solenoid valve, the switch solenoid valve corresponding to the current gear and the switch solenoid valve corresponding to the target gear based on a preset second control method.

[0017] The beneficial effect of adopting the above further solution is that by judging the specific conditions of the current gear and the target gear, the system can more accurately identify the type of gear shift to be performed. Different control strategies are adopted for different gear shift types, making the gear shift process smoother and faster, reducing power interruption and impact, thereby improving driving comfort and experience.

[0018] Further, the operating parameter information also includes the pressure of the starting clutch and the pressure of the gear clutch corresponding to the target gear. If the control strategy is the first control strategy, the controller controls the operating states of the proportional solenoid valve and at least one switch solenoid valve of the gearbox based on the control strategy to switch the current gear of the gearbox to the target gear. The processing includes:

[0019] Controlling the operating state of the switch solenoid valve corresponding to the target gear to be in an open state, so that the gear clutch corresponding to the target gear is engaged; and controlling the operating state of the proportional solenoid valve to be in an open state, and controlling the valve opening of the proportional solenoid valve based on a preset proportional solenoid valve control rule, so that the starting clutch starts to be filled with oil;

[0020] When the pressure of the gear clutch corresponding to the target gear reaches a preset first pressure threshold, the valve opening of the proportional solenoid valve is adjusted to allow the starting clutch to perform a clamping operation, until the pressure of the starting clutch reaches a preset second pressure threshold, and the current gear of the transmission is switched to the target gear.

[0021] The beneficial effect of adopting the above further scheme is: by directly controlling the switch solenoid valve corresponding to the target gear to be in the open state, the target gear clutch is quickly engaged, and at the same time, the proportional solenoid valve is controlled to start filling oil to prepare for the compression of the starting clutch, which reduces the waiting time during the gear shifting process and improves the gear shifting efficiency. After the target gear clutch begins to engage, by controlling the valve opening of the proportional solenoid valve, the pressure of the starting clutch can be gradually increased to achieve a smooth compression operation and reduce the impact and frustration during the gear shifting process. After the pressure of the target gear clutch reaches the preset first pressure threshold, the compression operation of the starting clutch is performed to ensure that the target gear clutch is sufficiently engaged and can withstand the load of power transmission, thereby avoiding power loss or mechanical damage caused by incomplete engagement of the clutch.

[0022] Further, if the control strategy is the second control strategy, the controller controls the operating states of the proportional solenoid valve and at least one switch solenoid valve of the gearbox based on the control strategy so that the current gear position of the gearbox is switched to the target gear position. The processing includes:

[0023] determining a target pressure threshold of the starting clutch based on the load information of the tractor;

[0024] Controlling the operating state of the proportional solenoid valve to be an open state to reduce the pressure of the starting clutch;

[0025] When the pressure of the starting clutch drops to the target pressure threshold, and after waiting for a set first time, the operation state of the switch solenoid valve corresponding to the current gear is controlled to be in the open state, and the operation state of the switch solenoid valve corresponding to the target gear is controlled to be in the closed state;

[0026] Determining whether the pressure of the gear clutch corresponding to the target gear reaches a preset third pressure threshold;

[0027] When the pressure of the gear clutch corresponding to the target gear reaches a preset third pressure threshold, after waiting for a set second time, the valve opening of the proportional solenoid valve is controlled based on the load information and the set slope clamping rule to enable the starting clutch to perform a clamping operation, until the pressure of the starting clutch reaches a preset fourth pressure threshold, and the current gear of the transmission is switched to the target gear.

[0028] The beneficial effect of adopting the above further scheme is: by first reducing the pressure of the starting clutch to the target pressure threshold, and after confirming that the target gear clutch begins to engage (that is, the pressure of the gear clutch corresponding to the target gear reaches the preset third pressure threshold), the starting clutch is gradually tightened, so that the power transmission during the gear shifting process is smoother, reducing the impact and frustration caused by the sudden engagement or separation of the gear clutch, thereby enhancing the smoothness of the gear shifting.

[0029] After the pressure of the starting clutch drops to the target pressure threshold, it waits for the set first time to ensure that the clutch pressure is stable, avoiding shift failure caused by pressure fluctuations during the shift process. At the same time, by monitoring whether the pressure of the target gear clutch reaches the preset third pressure threshold, it can ensure that the target gear clutch is ready to receive power transmission, thereby improving the success rate of shifting.

[0030] The target pressure threshold of the starting clutch is determined according to the load information of the tractor, and the valve opening of the proportional solenoid valve is controlled based on the load information and the set slope clamping rule. The clamping speed and strength of the clutch can be adjusted according to different load conditions to adapt to different working conditions and avoid slippage of the starting clutch during the gear shifting process.

[0031] Further, the controller determines the target pressure threshold of the starting clutch based on the load information of the tractor, including:

[0032] When the load information of the tractor is less than a preset load threshold, determining the drop pressure of the starting clutch to be a third pressure threshold;

[0033] When the load information of the tractor is not less than a preset load threshold, the drop pressure of the starting clutch is determined to be a fourth pressure threshold, and the fourth pressure threshold is greater than the third pressure threshold.

[0034] The beneficial effects of adopting the above further scheme are: by dynamically adjusting the target pressure threshold of the starting clutch according to the load information of the tractor, under light load conditions, using a lower third pressure threshold can reduce the pressure of the starting clutch more quickly, thereby shortening the shifting time and improving the response speed; under heavy load conditions, using a higher fourth pressure threshold can ensure that the clutch has sufficient pressure to transmit power during the shifting process, preventing slippage or power interruption caused by insufficient pressure. Avoiding the slippage state of the starting clutch during the shifting process.

[0035] Further, the controller determines whether the current gear position of the tractor's gearbox meets the automatic gear shifting condition, including:

[0036] If the current gear position is the same as the target gear position, determining that the current gear position of the transmission does not satisfy the automatic gear shifting condition;

[0037] If the current gear position is different from the target gear position, it is determined that the current gear position of the transmission satisfies the automatic gear shifting condition.

[0038] The beneficial effect of adopting the above further solution is that the clear gear shift condition judgment logic makes the controller more reliable when performing the gear shift operation.

[0039] In a second aspect, the present application provides a tractor transmission shift control method, which adopts the following technical solution:

[0040] A gear shift control method for a tractor transmission, comprising:

[0041] Acquire the operating parameter information and load information of the tractor in real time, wherein the operating parameter information includes the current gear position of the gearbox and the current speed of the engine, and determine the target gear position corresponding to the current speed;

[0042] Determining whether the current gear position of the gearbox of the tractor meets the automatic gear shifting condition;

[0043] If the current gear of the gearbox of the tractor meets the automatic gear shifting condition, a control strategy is generated based on the operating parameter information and a preset control rule, and the operating states of the proportional solenoid valve and at least one switch solenoid valve of the gearbox are controlled based on the control strategy to switch the current gear of the gearbox to a target gear. The control strategy is a first control strategy for controlling the proportional solenoid valve and the switch solenoid valve corresponding to the target gear, or a second control strategy for controlling the proportional solenoid valve, the switch solenoid valve corresponding to the current gear, and the switch solenoid valve corresponding to the target gear.

[0044] In a third aspect, the present application provides an electronic device, which adopts the following technical solution:

[0045] An electronic device comprises a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and execute the transmission shift control method for a tractor described in the second aspect.

[0046] In a fourth aspect, the present application provides a computer-readable storage medium, which adopts the following technical solution:

[0047] A computer-readable storage medium stores a computer program that can be loaded by a processor and execute the transmission shift control method for a tractor according to the second aspect.

[0048] In a fifth aspect, the present application provides a tractor, which adopts the following technical solution:

[0049] A tractor comprises the electronic device described in the third aspect.

[0050] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic structural diagram of a gearbox shift control system for a tractor provided by one embodiment of the present invention;

[0052] Figure 2 A schematic structural diagram of a gearbox of a gearbox shift control system for a tractor provided by one embodiment of the present invention;

[0053] Figure 3A schematic diagram of switching between forward gears of a gearbox shift control system of a tractor provided by one embodiment of the present invention;

[0054] Figure 4 Another schematic diagram of switching between forward gears of a transmission shift control system of a tractor provided by one embodiment of the present invention;

[0055] Figure 5 A schematic diagram of switching from neutral to forward gear of a tractor transmission shift control system provided by one embodiment of the present invention;

[0056] Figure 6 A schematic flow chart of a tractor transmission shift control method provided by one embodiment of the present invention;

[0057] Figure 7 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention.

[0058] Among them, the reference numerals are: 10, controller; 11, switch solenoid valve; 12, proportional solenoid valve; 13, starting clutch; 14, gear clutch. DETAILED DESCRIPTION

[0059] The present application is further described in detail below in conjunction with the accompanying drawings.

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0061] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article, unless otherwise specified, generally means that the associated objects before and after are in an "or" relationship.

[0062] The solution provided by the embodiment of the present invention can be applied to any application scenario where automatic gear shifting control is required for a tractor. The solution provided by the embodiment of the present invention can be executed by an electronic device with a data processing function, such as a controller 10 with a data processing function installed on a tractor.

[0063] The present application embodiment provides a possible implementation method, such as Figure 1As shown, a schematic diagram of the structure of a gearbox shift control system for a tractor is provided, such as Figure 1 and Figure 2 As shown, the system includes a starting clutch 13, a gearbox and a controller 10 arranged on the tractor, the starting clutch 13 is controlled by a proportional solenoid valve 12, the gearbox includes a plurality of gear clutches 14, each of the gear clutches 14 is controlled by a switch solenoid valve 11, the proportional solenoid valve 12 and each of the switch solenoid valves 11 are connected to the controller 10; the switch solenoid valve 11 is used to control the engagement of the gear clutch 14.

[0064] The controller 10 is used to obtain the operating parameter information and load information of the tractor in real time, wherein the operating parameter information includes the current gear of the transmission and the current speed of the engine, and determines the target gear corresponding to the current speed. The operating parameter information also includes the pressure of the starting clutch 13 and the pressure of the gear clutch 14 corresponding to the target gear, etc., wherein the current gear represents the gear of the transmission used to control the engagement of the gear clutch 14, the target gear represents the gear calculated by a preset gear algorithm according to the current speed or speed signal of the engine, and the load information of the tractor is obtained by reading the CAN bus data.

[0065] Determining whether the current gear position of the gearbox of the tractor meets the automatic gear shifting condition;

[0066] If the gearbox of the tractor meets the automatic shifting condition, a control strategy is generated based on the operating parameter information and the preset control rules, and the operating states of the proportional solenoid valve 12 and at least one switch solenoid valve 11 of the gearbox are controlled based on the control strategy to switch the current gear of the gearbox to the target gear. The control strategy is a first control strategy for controlling the proportional solenoid valve 12 and the switch solenoid valve 11 corresponding to the target gear, or a second control strategy for controlling the proportional solenoid valve 12, the switch solenoid valve 11 corresponding to the current gear, and the switch solenoid valve 11 corresponding to the target gear.

[0067] The system uses a switch solenoid valve 11 to control the gear clutch 14. The switch solenoid valve 11 can minimize the gear shifting time, reduce clutch slippage, and increase the service life of the gearbox during the gear shifting process. By acquiring the tractor's operating parameter information in real time (such as the current gear of the gearbox, the target gear corresponding to the current engine speed, and the tractor's load information), the system can more accurately determine the timing of the gear shift, thereby improving the efficiency and smoothness of the gear shift. By determining the control strategy for the gear shift according to the tractor's load, current gear, and target gear, and shifting according to the control strategy, the impact and gear shifting efficiency during the gear shifting process can be effectively reduced, and driving comfort can be improved.

[0068] In the embodiment of the present application, specifically, the process of the controller 10 determining whether the current gear position of the gearbox of the tractor meets the automatic gear shifting condition includes:

[0069] If the current gear position is the same as the target gear position, determining that the current gear position of the transmission does not satisfy the automatic gear shifting condition;

[0070] If the current gear position is different from the target gear position, it is determined that the current gear position of the transmission satisfies the automatic gear shifting condition.

[0071] As an example, assuming that the current gear position of the transmission is forward gear 3 and the target gear position is forward gear 5, it is determined that the automatic shifting condition is met and a control strategy for shifting from forward gear 3 to forward gear 5 is prepared to be executed.

[0072] As an optional implementation of the embodiment of the present application, the controller 10 generates a control strategy based on the operating parameter information and the preset control rules, including:

[0073] Determining whether the current gear is a first set gear and whether the target gear is a second set gear, wherein the first set gear is a neutral gear, which represents a gear of the gearbox in a state of no power output; the second set gear is a forward gear or a reverse gear, wherein the forward gear represents a gear when controlling the tractor to travel forward, and the reverse gear represents a gear when controlling the tractor to travel backward;

[0074] If the current gear is the first set gear and the target gear is the second set gear, a first control strategy is generated based on the current gear and the target gear, wherein the first control strategy is a strategy for controlling the operating states of the proportional solenoid valve 12 and the switch solenoid valve 11 corresponding to the target gear based on a preset first control mode;

[0075] If the current gear is not the first set gear and the target gear is the second set gear, a second control strategy is generated based on the current gear, the target gear and the load information. The second control strategy is a strategy for controlling the operating states of the proportional solenoid valve 12, the switch solenoid valve 11 corresponding to the current gear and the switch solenoid valve 11 corresponding to the target gear based on a preset second control method.

[0076] As an example, assuming that the tractor is traveling at a low speed and the current gear is forward gear 1, when the driver wants to accelerate, the target gear is determined to be forward gear 2 according to the current speed of the engine. The controller 10 will detect this change and control the gear shift of the transmission according to the second control strategy.

[0077] Specifically, if the control strategy is the first control strategy, the controller 10 controls the operating states of the proportional solenoid valve 12 and at least one switch solenoid valve 11 of the gearbox based on the control strategy so that the current gear position of the gearbox is switched to the target gear position. The processing includes:

[0078] Controlling the operating state of the switch solenoid valve 11 corresponding to the target gear to be in an open state, so that the gear clutch 14 corresponding to the target gear is engaged; and controlling the operating state of the proportional solenoid valve 12 to be in an open state, and controlling the valve opening of the proportional solenoid valve 12 based on a preset control rule of the proportional solenoid valve 12, so that the starting clutch 13 starts to be filled with oil;

[0079] When the pressure of the gear clutch 14 corresponding to the target gear reaches a preset first pressure threshold, the valve opening of the proportional solenoid valve 12 is adjusted to enable the starting clutch 13 to perform a clamping operation, until the pressure of the starting clutch 13 reaches a preset second pressure threshold, and the current gear of the transmission is switched to the target gear.

[0080] In the implementation mode of this application, Figure 3 As an example, the attached Figure 3 Where N indicates that the current gear is the neutral gear, and F[x] indicates that the target gear is the forward gear. For the starting operation, when the controller 10 monitors that the current gear is switched from N to the target gear F[x], first, the controller 10 controls the state of the switch solenoid valve 11 corresponding to F[x] to be in the open state, so that the gear clutch 14 corresponding to F[x] starts to be filled with oil and is ready to engage.

[0081] At the same time, the controller 10 controls the proportional solenoid valve 12 to enter the open state, and the starting clutch 13 begins to fill with oil. During the control process, the controller 10 monitors the pressure of the gear clutch 14 corresponding to F[x] (e.g., Figure 3 When the pressure at point A reaches the first pressure threshold, it indicates that the gear clutch 14 has been partially engaged but not completely locked. Once the pressure of the gear clutch 14 corresponding to F[x] reaches the first pressure threshold, the controller 10 adjusts the valve opening of the proportional solenoid valve 12 to slow down the further filling of the starting clutch 13 and starts the clamping operation until the pressure of the starting clutch 13 (e.g., Figure 3 When the pressure at point B in the transmission reaches a preset second pressure threshold, it is determined that the starting clutch 13 begins to be tightened. At this time, the clutch is completely locked, the power transmission is stable, and the current gear position of the transmission is switched to the target gear position.

[0082] It should be noted that the first pressure threshold and the second pressure threshold are calibrated by engineers according to actual operating parameters of the tractor.

[0083] The above embodiment directly controls the switch solenoid valve 11 corresponding to the target gear to be in the open state, so that the target gear clutch 14 is quickly engaged, and at the same time controls the proportional solenoid valve 12 to start filling oil to prepare for the tightening of the starting clutch 13, thereby reducing the waiting time during the gear shifting process and improving the gear shifting efficiency.

[0084] In the embodiment of the present application, specifically, if the control strategy is the second control strategy, the controller 10 controls the operating states of the proportional solenoid valve 12 and at least one switch solenoid valve 11 of the gearbox based on the control strategy, so that the current gear position of the gearbox is switched to the target gear position. The processing includes:

[0085] determining a target pressure threshold of the starting clutch 13 based on the load information of the tractor;

[0086] Controlling the operating state of the proportional solenoid valve 12 to be in an open state to reduce the pressure of the starting clutch 13;

[0087] When the pressure of the starting clutch 13 drops to the target pressure threshold, and after waiting for a set first time, the operation state of the switch solenoid valve 11 corresponding to the current gear is controlled to be an open state, and the operation state of the switch solenoid valve 11 corresponding to the target gear is controlled to be a closed state;

[0088] Determining whether the pressure of the gear clutch 14 corresponding to the target gear reaches a preset third pressure threshold;

[0089] When the pressure of the gear clutch 14 corresponding to the target gear reaches the preset third pressure threshold, after waiting for the set second time, the valve opening of the proportional solenoid valve 12 is controlled based on the load information and the set slope clamping rule to enable the starting clutch 13 to perform a clamping operation, until the pressure of the starting clutch 13 reaches the preset fourth pressure threshold, and the current gear of the transmission is switched to the target gear.

[0090] In the embodiments of the present application, Figure 4 As an example, the attached Figure 4 In the figure, the OffGoing clutch indicates the gear clutch 14 corresponding to the gear to be disconnected, the OnComing clutch indicates the gear clutch 14 corresponding to the gear to be engaged, F[x] indicates that the current gear is the forward gear, and F[x+1] indicates that the target gear is the forward gear. For example, F[x] is forward gear 1, and F[x+1] is forward gear 2. T1 indicates the first time, and T2 indicates the second time.

[0091] When the gearbox needs to switch from F[x] to F[x+1], the controller 10 first controls the operation state of the proportional solenoid valve 12 to be in the open state, and gradually reduces the pressure of the starting clutch 13 (for example, the pressure of the starting clutch 13 is increased). Figure 4 pressure at point A in the figure).

[0092] When the pressure of the starting clutch 13 drops to the target pressure threshold and maintains for T1 time, it is determined that the pressure of the starting clutch 13 is stable, and the controller 10 controls the operating state of the switch solenoid valve 11 corresponding to F[x] to be closed, and at the same time controls the operating state of the switch solenoid valve 11 corresponding to F[x+1] to be open. At this time, the gear clutch 14 corresponding to F[x+1] is ready to be engaged.

[0093] When the pressure of the gear clutch 14 corresponding to F[x+1] (e.g., Figure 4 When the pressure at point C in F[x+1] reaches the preset third pressure threshold, wait for T2 time, indicating that the gear clutch 14 corresponding to F[x+1] has been stably engaged. According to the load information and the set slope clamping rule, the controller 10 gradually adjusts the valve opening of the proportional solenoid valve 12 and starts to clamp the starting clutch 13. The pressure of the starting clutch 13 gradually rises until it reaches the preset fourth pressure threshold, at which time the starting clutch 13 is fully clamped and the shifting process is completed.

[0094] It should be noted that the first time, second time, target pressure threshold, third pressure threshold, fourth pressure threshold and slope are all calibrated by engineers based on actual vehicle parameter testing. The greater the slope, the worse the gear shifting smoothness; the higher the load, the greater the rising slope, ensuring rapid engagement of the clutch.

[0095] By first reducing the pressure of the starting clutch 13 to the target pressure threshold, and after confirming that the target gear clutch 14 begins to engage (that is, the pressure of the gear clutch 14 corresponding to the target gear reaches the preset third pressure threshold), the starting clutch 13 is gradually tightened, so that the power transmission during the gear shifting process is smoother, and the impact and frustration caused by the sudden engagement or separation of the gear clutch 14 are reduced, thereby enhancing the smoothness of the gear shifting.

[0096] After the pressure of the starting clutch 13 drops to the target pressure threshold, the first set time is waited to ensure that the clutch pressure is stable, thereby avoiding shift failure caused by pressure fluctuations during the shifting process. At the same time, by monitoring whether the pressure of the target gear clutch 14 reaches the preset third pressure threshold, it can be ensured that the target gear clutch 14 is ready to receive power transmission, thereby improving the success rate of the shifting.

[0097] Optionally, the controller 10 determines the target pressure threshold of the starting clutch 13 based on the load information of the tractor, including:

[0098] When the load information of the tractor is less than a preset load threshold, determining the target pressure threshold of the starting clutch 13 to be a first decreasing pressure threshold;

[0099] When the load information of the tractor is not less than a preset load threshold, the target pressure threshold of the starting clutch 13 is determined to be a second drop pressure threshold, and the second drop pressure threshold is greater than the first drop pressure threshold.

[0100] In the implementation mode of this application, Figure 5 As shown, P1 represents the second pressure drop threshold, P2 represents the first pressure drop threshold, and the shifting process is not described in detail.

[0101] In order to ensure that the starting clutch 13 is not in a slipping state during the gear shifting process, the target pressure threshold of the starting clutch 13 is dynamically adjusted according to the load information of the tractor. Under light load conditions, using a lower third pressure threshold can reduce the pressure of the starting clutch 13 more quickly, thereby shortening the gear shifting time and improving the response speed; under heavy load conditions, using a higher fourth pressure threshold can ensure that the clutch has sufficient pressure to transmit power during the gear shifting process, preventing slipping or power interruption caused by insufficient pressure.

[0102] Based on Figure 1 Based on the same principle as the system shown in , the embodiment of the present invention also provides a tractor transmission shift control method, see Figure 6 , the gearbox shift control method of a tractor comprises:

[0103] Step S1, acquiring operating parameter information and load information of the tractor in real time, wherein the operating parameter information includes a current gear position of the gearbox and a current speed of the engine, and determining a target gear position corresponding to the current speed;

[0104] Step S2, determining whether the current gear position of the gearbox of the tractor meets the automatic gear shifting condition;

[0105] Step S3: If the current gear of the gearbox of the tractor meets the automatic shifting condition, a control strategy is generated based on the operating parameter information and the preset control rules, and the operating states of the proportional solenoid valve 12 and at least one switch solenoid valve 11 of the gearbox are controlled based on the control strategy to switch the current gear of the gearbox to the target gear. The control strategy is a first control strategy for controlling the proportional solenoid valve 12, the switch solenoid valve 11 corresponding to the current gear, and the switch solenoid valve 11 corresponding to the target gear, or a second control strategy for controlling the proportional solenoid valve 12 and the switch solenoid valve 11 corresponding to the target gear.

[0106] It should be noted that the execution body of the method may be the controller 10, and its implementation principle is the same as the principle of the transmission shift control system of a tractor described above, which will not be repeated here.

[0107] Based on the same principle as the method shown in the embodiment of the present invention, an electronic device is also provided in the embodiment of the present invention, such as Figure 7 As shown, the electronic device 300 includes a processor 301 and a memory 302 , and may further include one or more of an information input / information output (I / O) interface 303 and a communication component 304 .

[0108] The processor 301 is used to control the overall operation of the electronic device 300 to complete all or part of the steps in the above-mentioned tractor gearbox shift control method; the memory 302 is used to store various types of data to support the operation of the electronic device 300, and these data may include, for example, instructions for any application or method operated on the electronic device 300, and data related to the application. The memory 302 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0109] The I / O interface 303 provides an interface between the processor 301 and other interface modules, and the above-mentioned other interface modules can be keyboards, mice, buttons, etc. These buttons can be virtual buttons or physical buttons. The communication component 304 is used to test the wired or wireless communication between the electronic device 300 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G or 4G, or a combination of one or more of them, so the corresponding communication component 304 can include: Wi-Fi components, Bluetooth components, NFC components.

[0110] The communication bus 305 may include a path to transmit information between the above components. The communication bus 305 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The communication bus 305 may be divided into an address bus, a data bus, a control bus, etc.

[0111] The electronic device 300 can be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the tractor transmission shift control method given in the above embodiment.

[0112] The computer-readable storage medium provided in the embodiment of the present application is introduced below. The computer-readable storage medium described below and the transmission shift control method for the tractor described above can be referred to each other.

[0113] The present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned tractor transmission shift control method are implemented.

[0114] The computer-readable storage medium may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0115] The terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0116] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of application involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the aforementioned application concept. For example, the above features are replaced with (but not limited to) technical features with similar functions applied in the present application.

Claims

1. A gearbox shift control system for a tractor, characterized in that: It comprises a starting clutch, a gearbox and a controller arranged on a tractor, wherein the starting clutch is controlled by a proportional solenoid valve, the gearbox comprises a plurality of gear clutches, each of the gear clutches is controlled by a switch solenoid valve, and the proportional solenoid valve and each of the switch solenoid valves are connected to the controller; The controller is used to obtain the operating parameter information and load information of the tractor in real time, the operating parameter information including the current gear position of the gearbox and the current speed of the engine, and determine the target gear position corresponding to the current speed; Determining whether the current gear position of the gearbox of the tractor meets the automatic gear shifting condition; If the current gear of the gearbox of the tractor meets the automatic gear shifting condition, a control strategy is generated based on the operating parameter information and the preset control rules, and the operating states of the proportional solenoid valve and at least one switch solenoid valve of the gearbox are controlled based on the control strategy, so that the current gear of the gearbox is switched to the target gear, and the control strategy is a first control strategy for controlling the proportional solenoid valve and the switch solenoid valve corresponding to the target gear, or a second control strategy for controlling the proportional solenoid valve, the switch solenoid valve corresponding to the current gear, and the switch solenoid valve corresponding to the target gear; The controller generates a control strategy based on the operating parameter information and the preset control rules, and the processing includes: Determining whether the current gear is a first set gear and whether the target gear is a second set gear, the first set gear being a neutral gear, the neutral gear representing a gear when the gearbox is in a state of no power output, the second set gear being a forward gear or a reverse gear, the forward gear representing a gear when the tractor is controlled to travel forward, and the reverse gear representing a gear when the tractor is controlled to travel backward; If the current gear is the first set gear and the target gear is the second set gear, a first control strategy is generated based on the current gear and the target gear, wherein the first control strategy is a strategy for controlling the operating states of the proportional solenoid valve and the switch solenoid valve corresponding to the target gear based on a preset first control mode; If the current gear is not the first set gear and the target gear is the second set gear, a second control strategy is generated based on the current gear, the target gear and the load information, wherein the second control strategy is a strategy for controlling the operating states of the proportional solenoid valve, the switch solenoid valve corresponding to the current gear and the switch solenoid valve corresponding to the target gear based on a preset second control mode; The operating parameter information also includes the pressure of the starting clutch and the pressure of the gear clutch corresponding to the target gear. If the control strategy is the first control strategy, the controller controls the operating states of the proportional solenoid valve and at least one switch solenoid valve of the gearbox based on the control strategy to switch the current gear of the gearbox to the target gear. The processing includes: Controlling the operating state of the switch solenoid valve corresponding to the target gear to be in an open state, so that the gear clutch corresponding to the target gear is engaged; and controlling the operating state of the proportional solenoid valve to be in an open state, and controlling the valve opening of the proportional solenoid valve based on a preset proportional solenoid valve control rule, so that the starting clutch starts to be filled with oil; When the pressure of the gear clutch corresponding to the target gear reaches a preset first pressure threshold, the valve opening of the proportional solenoid valve is adjusted to allow the starting clutch to perform a clamping operation, until the pressure of the starting clutch reaches a preset second pressure threshold, and the current gear of the transmission is switched to the target gear.

2. A tractor transmission shift control system according to claim 1, characterized in that: If the control strategy is the second control strategy, the controller controls the operating states of the proportional solenoid valve and at least one switch solenoid valve of the gearbox based on the control strategy so that the current gear position of the gearbox is switched to the target gear position. The processing includes: determining a target pressure threshold of the starting clutch based on the load information of the tractor; Controlling the operating state of the proportional solenoid valve to be an open state to reduce the pressure of the starting clutch; When the pressure of the starting clutch drops to the target pressure threshold, and after waiting for a set first time, the operation state of the switch solenoid valve corresponding to the current gear is controlled to be in the open state, and the operation state of the switch solenoid valve corresponding to the target gear is controlled to be in the closed state; Determining whether the pressure of the gear clutch corresponding to the target gear reaches a preset third pressure threshold; When the pressure of the gear clutch corresponding to the target gear reaches a preset third pressure threshold, after waiting for a set second time, the valve opening of the proportional solenoid valve is controlled based on the load information and the set slope clamping rule to enable the starting clutch to perform a clamping operation, until the pressure of the starting clutch reaches a preset fourth pressure threshold, and the current gear of the transmission is switched to the target gear.

3. A tractor transmission shift control system according to claim 2, characterized in that: The processing process of the controller determining the target pressure threshold of the starting clutch based on the load information of the tractor includes: When the load information of the tractor is less than a preset load threshold, determining the target pressure threshold of the starting clutch to be a first decreasing pressure threshold; When the load information of the tractor is not less than a preset load threshold, the target pressure threshold of the starting clutch is determined to be a second decreasing pressure threshold, and the second decreasing pressure threshold is greater than the first decreasing pressure threshold.

4. A tractor transmission shift control system according to claim 1, characterized in that: The processing process of the controller judging whether the current gear position of the gearbox of the tractor meets the automatic gear shifting condition includes: If the current gear position is the same as the target gear position, determining that the current gear position of the transmission does not satisfy the automatic gear shifting condition; If the current gear position is different from the target gear position, it is determined that the current gear position of the transmission satisfies the automatic gear shifting condition.

5. A tractor gearbox shift control method, characterized in that: include: Acquire the operating parameter information and load information of the tractor in real time, wherein the operating parameter information includes the current gear position of the gearbox and the current speed of the engine, and determine the target gear position corresponding to the current speed; Determining whether the current gear position of the gearbox of the tractor meets the automatic gear shifting condition; If the current gear of the gearbox of the tractor meets the automatic gear shifting condition, a control strategy is generated based on the operating parameter information and the preset control rules, and the operating states of the proportional solenoid valve and at least one switch solenoid valve of the gearbox are controlled based on the control strategy, so that the current gear of the gearbox is switched to the target gear, and the control strategy is a first control strategy for controlling the proportional solenoid valve and the switch solenoid valve corresponding to the target gear, or a second control strategy for controlling the proportional solenoid valve, the switch solenoid valve corresponding to the current gear, and the switch solenoid valve corresponding to the target gear; The process of generating a control strategy based on the operating parameter information and the preset control rules includes: Determining whether the current gear is a first set gear and whether the target gear is a second set gear, the first set gear being a neutral gear, the neutral gear representing a gear when the gearbox is in a state of no power output, the second set gear being a forward gear or a reverse gear, the forward gear representing a gear when the tractor is controlled to travel forward, and the reverse gear representing a gear when the tractor is controlled to travel backward; If the current gear is the first set gear and the target gear is the second set gear, a first control strategy is generated based on the current gear and the target gear, wherein the first control strategy is a strategy for controlling the operating states of the proportional solenoid valve and the switch solenoid valve corresponding to the target gear based on a preset first control mode; If the current gear is not the first set gear and the target gear is the second set gear, a second control strategy is generated based on the current gear, the target gear and the load information, wherein the second control strategy is a strategy for controlling the operating states of the proportional solenoid valve, the switch solenoid valve corresponding to the current gear and the switch solenoid valve corresponding to the target gear based on a preset second control mode; The operating parameter information also includes the pressure of the starting clutch and the pressure of the gear clutch corresponding to the target gear. If the control strategy is the first control strategy, the controller controls the operating state of the proportional solenoid valve and at least one switch solenoid valve of the gearbox based on the control strategy to switch the current gear of the gearbox to the target gear. The processing includes: Controlling the operating state of the switch solenoid valve corresponding to the target gear to be in an open state, so that the gear clutch corresponding to the target gear is engaged; and controlling the operating state of the proportional solenoid valve to be in an open state, and controlling the valve opening of the proportional solenoid valve based on a preset proportional solenoid valve control rule, so that the starting clutch starts to be filled with oil; When the pressure of the gear clutch corresponding to the target gear reaches a preset first pressure threshold, the valve opening of the proportional solenoid valve is adjusted to allow the starting clutch to perform a clamping operation, until the pressure of the starting clutch reaches a preset second pressure threshold, and the current gear of the transmission is switched to the target gear.

6. An electronic device, characterized in that: comprising a processor coupled to a memory; The processor is used to execute the computer program stored in the memory, so that the electronic device executes the transmission shift control method for the tractor according to claim 5.

7. A computer-readable storage medium, characterized in that: The method comprises a computer program or an instruction, and when the computer program or the instruction is executed on a computer, the computer is caused to execute the transmission shift control method for the tractor as claimed in claim 5 .

8. A tractor, characterized in that: Comprising the electronic device as claimed in claim 6.

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