Control method and device for ground speed pto

Abstract

The application discloses a ground speed PTO control method and device, and relates to the technical field of vehicle safety. The method comprises the following steps: in response to a mode switching instruction, obtaining a whole vehicle running state; judging whether the whole vehicle running state meets a pre-set working mode condition; switching different working modes according to the met working mode condition; wherein, a ground speed PTO synchronizer and an engine speed PTO synchronizer are set, and the switching of the working modes in different running states is realized by controlling the combination or disconnection of the engine speed PTO synchronizer and the ground speed PTO synchronizer. The application can realize the state switching of two different PTO working modes in different working conditions through an electric control mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle safety technology, and in particular to a ground speed PTO control method and device. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] In the field of agricultural mechanization, tractors serve as the main power source, and their power take-off (PTO) devices are crucial for agricultural operations. PTO devices can transmit the power of tractors to various agricultural equipment, such as rotary cultivators, balers, seeders, etc., to meet different operational needs. With the increasing degree of agricultural mechanization, the use of PTOs is expanding, and the demand for PTO rotational speed is becoming more diverse.

[0004] Hydraulic-mechanical continuously variable transmission (HMCVT) is a continuously variable transmission device that combines mechanical transmission and hydraulic transmission. It can optimize the power output and fuel economy of tractors under different working conditions by adjusting the transmission ratio. The application of this technology enables tractors to achieve more flexible and efficient power transmission in different operating environments.

[0005] PTO clutches are key components in tractor PTO systems, responsible for connecting or disconnecting the PTO output shaft from the tractor's power transmission system when needed. In existing technologies, PTO clutches are mostly operated manually, which not only increases the difficulty of operation for drivers, but also limits the development of tractor automation and intelligence.

[0006] Ground speed synchronization unit technology refers to the technology of synchronizing the PTO rotational speed of a tractor with its ground speed (i.e., the actual speed of the tractor on the ground). This technology is particularly important in cotton picking machines and other agricultural machinery, as it can ensure that the speed of the operating unit is linearly related to the ground speed of the tractor, thereby improving operational efficiency and quality. The invention patent with publication number CN104584777A and publication date of May 6, 2015, provides a low-cost tractor-mounted cotton picker with a ground speed synchronization unit. The rear power take-off device provides two operating modes, namely ground speed drive mode and normal mode. In the ground speed drive mode, the speed of the rear PTO changes according to the ground speed of the tractor and the automatically selected gear from the gearbox, and in the normal mode, the rear PTO operates at a constant speed.

[0007] Although the existing technology meets the needs of agricultural operations to some extent, there are still some limitations. For example, the existing ground speed synchronous operation mode is mostly manual operation, which cannot realize electric control control, and cannot realize automatic control. This limits the adaptability and efficiency of the tractor under different working conditions. In addition, the existing PTO system still needs to be improved in terms of power distribution and control, especially in terms of accurate control of power output and protection of the clutch.

[0008] In summary, based on the PTO system, the ground speed synchronous unit technology plays an important role in agricultural mechanization, but further technical improvement and innovation are needed to overcome the current defects of not being able to realize electric control and not being able to automatically switch modes according to the working conditions, in order to meet the needs of modern agriculture for high efficiency, automation and intelligence. SUMMARY

[0009] In view of the shortcomings of the prior art, the purpose of the present application is to provide a ground speed PTO control method and device, which can realize the state switching of two different PTO working modes under different working conditions through electric control.

[0010] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0011] The present application provides a ground speed PTO control method, comprising the following steps:

[0012] In response to the mode switching instruction, the whole vehicle running state is obtained;

[0013] It is judged whether the whole vehicle running state meets the pre-set working mode condition;

[0014] According to the satisfied working mode condition, different working modes are switched;

[0015] Among them, the ground speed PTO synchronizer and the engine speed PTO synchronizer are set, and the combination or disconnection of the engine speed PTO synchronizer and the ground speed PTO synchronizer is controlled to realize the switching of the working mode under different running states.

[0016] Further, the whole vehicle running state includes the parking condition and the driving condition, and the working mode includes the engine speed PTO mode and the ground speed PTO mode.

[0017] Further, when the working mode is the engine speed PTO mode, the engine speed PTO synchronizer is combined with the engine input shaft, at this time the PTO input shaft is directly connected with the engine input shaft, realizing the engine speed PTO mode, that is, the PTO speed is linearly related to the engine speed.

[0018] Further, when the working mode is the ground speed PTO mode, the ground speed PTO synchronizer is combined with the ground speed input shaft, at this time, the PTO input shaft is connected with the ground speed input shaft through the wheel edge output shaft, and the ground speed PTO function is realized, that is, the PTO rotation speed is linearly related to the ground vehicle speed.

[0019] Further, the control sequence of the engine rotation speed PTO mode under the parking working condition is: starting the engine, at this time, the engine input shaft rotation speed is the idle speed, first combining the engine rotation speed PTO synchronizer, combining the engine rotation speed PTO synchronizer to the engine input shaft, the combining process is the no-load speed difference combination; then combining the PTO gear pair and the meshing sleeve, the combining process is the no-load no-speed difference combination; then combining the PTO clutch, the combining process is the load speed difference combination, and finally realizing the mechanical connection between the engine input shaft and the PTO output shaft.

[0020] Further, the control sequence of the ground speed PTO mode under the parking working condition is: starting the engine, at this time, the engine input shaft rotation speed is the idle speed, first combining the ground speed PTO synchronizer, combining the ground speed PTO synchronizer to the ground speed input shaft, the combining process is the no-load no-speed difference combination; then combining the PTO gear position meshing sleeve, the combining process is the no-load no-speed difference combination; then combining the PTO clutch, the combining process is the no-load no-speed difference combination, and finally realizing the mechanical connection between the ground speed input shaft and the PTO output shaft.

[0021] Further, the control sequence of the engine rotation speed PTO mode switching to the ground speed PTO mode under the driving working condition is: first disconnecting the PTO clutch, at this time, it is the driving working condition with the no-load rotation speed, then disconnecting the engine rotation speed PTO synchronizer, combining the ground speed PTO synchronizer, at this time, the PTO intermediate shaft completes the switching between the connection to the engine input shaft and the connection to the ground speed input shaft; then combining the PTO clutch to complete the mode switching.

[0022] Further, the control sequence of the ground speed PTO mode switching to the engine rotation speed PTO mode under the driving working condition is: first disconnecting the PTO clutch, at this time, it is the driving working condition with the no-load rotation speed, then disconnecting the ground speed PTO synchronizer, combining the engine rotation speed PTO synchronizer, at this time, the PTO intermediate shaft completes the switching between the connection to the ground speed input shaft and the connection to the engine input shaft; then combining the PTO clutch to complete the mode switching.

[0023] Further, during the mode switching process, the friction work of the PTO clutch is synchronously detected, and if the friction work exceeds the friction work, the combination of the synchronizer needs to be stopped.

[0024] The second aspect of the present application provides a ground speed PTO control device, comprising:

[0025] The acquisition unit is configured to acquire the whole vehicle running state in response to the mode switching instruction.

[0026] A judging unit configured to judge whether the whole vehicle operating state meets a pre-set working mode condition;

[0027] An executing unit configured to switch different working modes according to the met working mode condition;

[0028] The executing unit is provided with a ground speed PTO synchronizer and an engine speed PTO synchronizer, and the switching of the working modes in different operating states is realized by controlling the combination or disconnection of the engine speed PTO synchronizer and the ground speed PTO synchronizer.

[0029] The above one or more technical solutions have the following beneficial effects:

[0030] The application discloses a control method and device for a ground speed PTO, which can realize automatic switching between an engine speed PTO mode and a ground speed PTO mode without manual intervention, thereby increasing the convenience and efficiency of operation and improving the adaptability and multifunctionality of the tractor.

[0031] The ground speed PTO mode can automatically adjust the PTO speed according to the actual driving speed of the tractor, so that the operating speed of the operating equipment (such as a rotary cultivator, a baling machine, a seeding machine, etc.) matches the ground speed of the tractor, thereby improving the efficiency and quality of operation.

[0032] The application realizes control of the PTO mode through an electronic control system, replaces the traditional manual operation mode, and reduces the operation complexity of the driver, the possibility of operation errors, and the possibility of operation errors, thereby improving the safety of operation and the modernization and intelligent level of the PTO system of the tractor.

[0033] The advantages of the additional aspects of the application will be partially given in the following description, partially become obvious from the following description, or be known through the practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein for explanation by illustrating a preferred embodiment of the present application.

[0035] Figure 1 FIG. 1 is a structural diagram of a ground speed PTO system with a synchronizer in Embodiment One of the application;

[0036] Figure 2Flowchart of the ground speed PTO control method in embodiment 1 of the present invention;

[0037] Among them, 1. Engine input shaft, 2. Ground speed input shaft, 3. Engine speed PTO synchronizer, 4. Ground speed PTO synchronizer, 5. PTO input shaft, 6. PTO clutch, 7. PTO intermediate shaft, 8. 540 rpm PTO gear pair and meshing sleeve, 9. 750 rpm PTO gear pair and meshing sleeve, 10. 1000 rpm PTO gear pair and meshing sleeve, PTO output shaft. DETAILED DESCRIPTION

[0038] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations;

[0040] Example 1:

[0041] A first embodiment of the present invention provides a method for controlling a ground speed PTO, comprising the following steps:

[0042] Step 1: In response to the mode switching instruction, obtain the vehicle operation status.

[0043] In this embodiment, a ground speed PTO synchronizer and an engine speed PTO synchronizer are provided in the existing PTO system, and the switching of the working modes under different operating states is achieved by controlling the engagement or disconnection of the engine speed PTO synchronizer and the ground speed PTO synchronizer.

[0044] In a specific embodiment, the structure diagram of the ground speed PTO system with synchronizer in this embodiment is as follows: Figure 1 As shown, it includes an engine input shaft 1, a ground speed input shaft 2, an engine speed PTO synchronizer 3, a ground speed PTO synchronizer 4, a PTO input shaft 5, a PTO clutch 6, a PTO intermediate shaft 7, three sets of PTO gear pairs and meshing sleeves with different speed ratios, and a PTO output shaft 11. The three sets of PTO gear pairs and meshing sleeves with different speed ratios are a 540 rpm PTO gear pair and meshing sleeve 8, a 750 rpm PTO gear pair and meshing sleeve 9, and a 1000 rpm PTO gear pair and meshing sleeve 10.

[0045] The synchronizer is a device used in the transmission, the main function is to achieve the speed synchronization between different gears or shafts, so as to help smoothly gear shifting. Its structure consists of a synchronizer ring, a slider, a spring, a coupling sleeve, etc., which contains an input end and two output ends. The synchronizer combination refers to the process of speed synchronization of the input end and the output end, and the synchronizer disconnection refers to the process of separation of the input end and the output end.

[0046] In this embodiment, the engine speed PTO synchronizer 3 and the ground speed PTO synchronizer 4 are respectively installed on the engine input shaft 1 or the ground speed input shaft 2 for selecting the power input source, when one of the synchronizers is combined, the power can be output to the PTO input shaft 5; the PTO clutch 6 is used to combine the PTO input shaft 5 and the PTO intermediate shaft 7, one of the gear pairs and the meshing sleeve is combined, and is used to transmit power to the PTO output shaft 11, and the PTO output shaft 11 is used to transmit power to the working equipment.

[0047] The vehicle operating state includes a parking condition and a driving condition, and the working mode includes an engine speed PTO mode and a ground speed PTO mode.

[0048] In a specific embodiment, when the working mode is the engine speed PTO mode, the engine speed PTO synchronizer combines the engine input shaft, at this time the PTO input shaft is connected with the engine input shaft, realizing the engine speed PTO mode, that is, the PTO speed is linearly related to the engine speed.

[0049] When the working mode is the ground speed PTO mode, the ground speed PTO synchronizer combines the ground speed input shaft, at this time the PTO input shaft is connected with the ground speed input shaft, realizing the ground speed PTO function, that is, the PTO speed is linearly related to the ground speed.

[0050] Step 2: Determine whether the vehicle operating state meets the pre-set working mode condition.

[0051] Step 3: Switch different working modes according to the working mode condition met.

[0052] This embodiment is to switch the engine speed PTO mode and the ground speed PTO mode by controlling the combination or disconnection of the engine speed PTO and the ground speed PTO synchronizers at different engine speeds or vehicle speeds.

[0053] As shown in Figure 2 , the specific steps are as follows:

[0054] Case 1: Control sequence of engine speed PTO mode in parking condition is: start engine, at this time engine input shaft speed is idle speed, PTO input shaft speed is 0 rpm, ground speed is 0 rpm; first combine engine speed PTO synchronizer, combine engine speed PTO synchronizer to engine input shaft, the combining process is no-load speed difference combination; then combine PTO gear pair and meshing sleeve, the combining process is no-load speed difference combination; then combine PTO clutch, the combining process is load speed difference combination, finally realize mechanical connection between engine input shaft and PTO output shaft.

[0055] Case 2: Control sequence of ground speed PTO mode in parking condition is: start engine, at this time engine input shaft speed is idle speed, PTO input shaft speed is 0 rpm, ground speed is 0 rpm; first combine ground speed PTO synchronizer, combine ground speed PTO synchronizer to ground speed input shaft, the combining process is no-load speed difference combination; then combine PTO gear pair and meshing sleeve, the combining process is no-load speed difference combination; then combine PTO clutch, the combining process is no-load speed difference combination, finally realize mechanical connection between ground speed input shaft and PTO output shaft.

[0056] Case 3: Control sequence of engine speed PTO mode switching to ground speed PTO mode in driving condition is: at this time engine input shaft speed is engine speed, PTO output shaft speed is speed under this gear, vehicle speed is current vehicle speed, at this time engine speed is linearly related to PTO speed. First disconnect PTO clutch, at this time it is driving condition with no-load speed; then disconnect engine speed PTO synchronizer, combine ground speed PTO synchronizer, at this time PTO intermediate shaft completes switching connection between engine input shaft and ground speed input shaft; then combine PTO clutch to complete mode switching. At this time, PTO clutch synchronizes speed difference between PTO intermediate shaft and PTO output shaft. This process synchronously detects PTO clutch friction work, if it exceeds friction work, combination needs to be stopped.

[0057] Case 4: Control sequence of ground speed PTO mode switching to engine speed PTO mode in driving condition is: at this time engine input shaft speed is engine speed, PTO output shaft speed is speed under this gear, vehicle speed is ground speed, at this time PTO speed is linearly related to vehicle speed. First disconnect PTO clutch, at this time it is driving condition with no-load speed; then disconnect ground speed PTO synchronizer, combine engine speed PTO synchronizer, at this time PTO intermediate shaft completes switching connection between ground speed input shaft and engine input shaft; then combine PTO clutch (clutch synchronizes speed difference between PTO intermediate shaft and PTO output shaft) to complete mode switching. This process synchronously detects PTO clutch friction work, if it exceeds friction work, combination needs to be stopped.

[0058] It needs to be specially pointed out that the principle of the clutch is to realize power transmission by pressing the driving friction plate and the driven friction plate. Therefore, the combination in the embodiment refers to the process of pressing the friction plate, and the disconnection refers to the process of separating the friction plate.

[0059] During the switching mode process, the friction work of the PTO clutch is detected synchronously, specifically, the speed difference between the driving friction plate and the driven friction plate of the clutch and the pressure of the two friction plates are detected, the friction work is calculated, if the friction work is exceeded, the combination of the synchronizer needs to be stopped to prevent overheating from causing the clutch to burn out.

[0060] The application can realize the electric control of the PTO mode, and realize the automatic switching of the engine speed PTO mode and the ground speed PTO mode without manual switching. Meanwhile, the friction work of the PTO clutch can be monitored to prevent the clutch from burning out.

[0061] Embodiment two:

[0062] The embodiment two of the application provides a control device of a ground speed PTO, which comprises:

[0063] An acquisition unit is configured to acquire a whole vehicle running state in response to a mode switching instruction;

[0064] A judgment unit is configured to judge whether the whole vehicle running state meets a pre-set working mode condition;

[0065] An execution unit is configured to switch different working modes according to the met working mode condition;

[0066] In the execution unit, a ground speed PTO synchronizer and an engine speed PTO synchronizer are arranged, and the combination or disconnection of the engine speed PTO synchronizer and the ground speed PTO synchronizer is controlled to realize the switching of the working modes in different running states.

[0067] The steps and methods involved in the above embodiment two correspond to the embodiment one, and the specific implementation manner can be referred to the related description part of the embodiment one.

[0068] Those skilled in the art should understand that the above-mentioned modules or steps of the application can be realized by a general computer device, alternatively, they can be realized by program codes executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be respectively manufactured into integrated circuit modules, or a plurality of modules or steps among them can be manufactured into a single integrated circuit module to realize. The application is not limited to any specific combination of hardware and software.

[0069] The above describes the specific embodiments of the present application in combination with the drawings, but is not a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications or variations made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.

Claims

1. A control method of a ground speed PTO, characterized by, The method comprises the following steps: obtaining a whole vehicle running state in response to a mode switching instruction; judging whether the whole vehicle running state meets a pre-set working mode condition; switching different working modes according to the met working mode condition; wherein a ground speed PTO synchronizer and an engine speed PTO synchronizer are set, and the switching of the working modes in different running states is realized by controlling the combination or disconnection of the engine speed PTO synchronizer and the ground speed PTO synchronizer.

2. The control method of ground speed PTO according to claim 1, characterized by, The whole vehicle running state comprises a parking condition and a driving condition, and the working mode comprises an engine speed PTO mode and a ground speed PTO mode.

3. The control method of ground speed PTO according to claim 2, characterized by, When the working mode is the engine speed PTO mode, the engine speed PTO synchronizer is combined with the engine input shaft, at this time, the PTO input shaft is directly connected with the engine input shaft, the engine speed PTO mode is realized, and the PTO speed is linearly related to the engine speed.

4. The control method of ground speed PTO according to claim 2, characterized by, When the working mode is the ground speed PTO mode, the ground speed PTO synchronizer is combined with the ground speed input shaft, at this time, the PTO input shaft is connected with the ground speed input shaft through the wheel edge output shaft, the ground speed PTO function is realized, and the PTO speed is linearly related to the ground speed.

5. The control method of ground speed PTO according to claim 2, characterized by, The control sequence of the engine speed PTO mode in the parking condition is: starting the engine, at this time, the engine input shaft speed is the idle speed, first combining the engine speed PTO synchronizer, combining the engine speed PTO synchronizer with the engine input shaft, the combination process is the empty load speed difference combination, then combining the PTO gear pair and the meshing sleeve, the combination process is the empty load speed difference combination, then combining the PTO clutch, the combination process is the loaded speed difference combination, and finally realizing the mechanical connection between the engine input shaft and the PTO output shaft.

6. The control method of ground speed PTO according to claim 2, characterized by, The control sequence of the ground speed PTO mode in the parking condition is: starting the engine, at this time, the engine input shaft speed is the idle speed, first combining the ground speed PTO synchronizer, combining the ground speed PTO synchronizer with the ground speed input shaft, the combination process is the empty load speed difference combination, then combining the PTO gear pair and the meshing sleeve, the combination process is the empty load speed difference combination, then combining the PTO clutch, the combination process is the empty load speed difference combination, and finally realizing the mechanical connection between the ground speed input shaft and the PTO output shaft.

7. The control method of ground speed PTO according to claim 2, characterized by, The control sequence of switching the engine speed PTO mode to the ground speed PTO mode in the driving condition is: first disconnecting the PTO clutch, at this time, it is the empty load speed driving condition, then disconnecting the engine speed PTO synchronizer and combining the ground speed PTO synchronizer, at this time, the PTO intermediate shaft completes the switching between the connection with the engine input shaft and the connection with the ground speed input shaft, then combining the PTO clutch to complete the mode switching.

8. The control method of ground speed PTO according to claim 2, characterized by, The control sequence of switching the ground speed PTO mode to the engine speed PTO mode in the driving condition is: first disconnecting the PTO clutch, at this time, it is the empty load speed driving condition, then disconnecting the ground speed PTO synchronizer and combining the engine speed PTO synchronizer, at this time, the PTO intermediate shaft completes the switching between the connection with the ground speed input shaft and the connection with the engine input shaft, then combining the PTO clutch to complete the mode switching.

9. The control method of ground speed PTO of claim 1, wherein, In the mode switching process, the friction work of the PTO clutch is synchronously detected, if it exceeds the friction work, the combination of the synchronizer needs to be stopped.

10. A control device for a ground speed PTO, characterized in that The method comprises: An acquisition unit is configured to acquire a whole vehicle running state in response to a mode switching instruction; A judgment unit is configured to judge whether the whole vehicle running state meets a pre-set working mode condition; An execution unit is configured to switch different working modes according to the met working mode condition; In the execution unit, a ground speed PTO synchronizer and an engine speed PTO synchronizer are arranged, and the switching of the working modes in different running states is realized by controlling the combination or disconnection of the engine speed PTO synchronizer and the ground speed PTO synchronizer.

Images