Ground speed PTO control method and device

Abstract

The invention 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 running state of the whole vehicle meets a preset working mode condition or not; switching different working modes according to the satisfied working mode conditions; wherein a ground speed PTO synchronizer and an engine rotating speed PTO synchronizer are arranged, and switching of working modes in different operation states is achieved by controlling combination or disconnection of the engine rotating speed PTO synchronizer and the ground speed PTO synchronizer. State switching of two different PTO working modes can be achieved under different working conditions in an electric control mode.

Description

Technical Field

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

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

[0003] In the field of agricultural mechanization, tractors are the main power source, and their power take-off (PTO) is crucial for agricultural operations. The PTO device can transmit the power of the tractor to various agricultural equipment, such as rotary tillers, balers, and seeders, to meet different operational needs. With the improvement of agricultural mechanization, the scope of use of PTO continues to expand, and the demand for PTO speed has become more diverse.

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

[0005] The PTO clutch is a key component in the tractor's PTO system. It is responsible for connecting or disconnecting the PTO output shaft and the tractor's power transmission system when needed. In existing technologies, the operation of the PTO clutch is mostly manual, which not only increases the difficulty of operation for the driver, but also limits the development of tractor automation and intelligence.

[0006] Ground speed synchronization unit technology refers to the technology of synchronizing the PTO speed of the tractor with the ground speed of the tractor (i.e., the actual driving speed of the tractor on the ground). This technology is particularly important in agricultural machinery such as cotton pickers because it can ensure that the speed of the operating unit is linearly related to the ground speed of the tractor, thereby improving operating efficiency and quality. Publication number CN104584777A, Chinese invention patent with publication date of May 6, 2015, "Low-cost tractor-mounted cotton picker with ground speed synchronization unit", provides a low-cost tractor with a ground speed synchronization unit, whose rear power output 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 gear automatically selected from the gearbox. In the normal mode, the rear PTO runs at a constant speed.

[0007] Although the existing technology has met the needs of agricultural operations to a certain extent, there are still some limitations. For example, the existing ground speed synchronization operation mode is mostly manual operation, which cannot be achieved by electronic control, let alone automatic control. This limits the adaptability and efficiency of the tractor under different operating conditions. In addition, there is still room for improvement in the power distribution and control of the existing PTO system, especially in the precise control of power output and the protection of the clutch.

[0008] In summary, although the ground speed synchronization unit technology based on the PTO system has played an important role in agricultural mechanization, it still needs further technical improvement and innovation to overcome the current defects of being unable to achieve electronic control and unable to automatically switch modes according to working conditions, so as to meet the needs of modern agriculture for high efficiency, automation and intelligence. Summary of the invention

[0009] In view of the deficiencies in the prior art, an object of the present invention is to provide a control method and device for a ground speed PTO, which can realize state switching between two different PTO working modes under different working conditions by means of electronic control.

[0010] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0011] A first aspect of the present invention provides a method for controlling a ground speed PTO, comprising the following steps:

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

[0013] Determining whether the vehicle operation state meets the preset working mode conditions;

[0014] Switch to different working modes according to the working mode conditions met;

[0015] Among them, a ground speed PTO synchronizer and an engine speed PTO synchronizer are set, and the switching of working modes under different operating conditions is realized by controlling the connection or disconnection of the engine speed PTO synchronizer and the ground speed PTO synchronizer.

[0016] Furthermore, the vehicle operation status includes parking condition and driving condition, and the operation mode includes engine speed PTO mode and ground speed PTO mode.

[0017] Furthermore, 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 to the engine input shaft to realize the engine speed PTO mode, that is, the PTO speed is linearly related to the engine speed.

[0018] Furthermore, 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 and the ground speed input shaft are connected through the wheel side output shaft to realize the ground speed PTO function, that is, the PTO speed is linearly related to the ground vehicle speed.

[0019] Furthermore, the control sequence of the engine speed PTO mode under parking conditions is: start the engine, when the engine input shaft speed is idle, first engage the engine speed PTO synchronizer, and combine the engine speed PTO synchronizer to the engine input shaft, and the engagement process is no-load with speed difference engagement; then combine the PTO gear pair and the meshing sleeve, and the engagement process is no-load without speed difference engagement; then combine the PTO clutch, and the engagement process is loaded with speed difference engagement, and finally realize the mechanical connection between the engine input shaft and the PTO output shaft.

[0020] Furthermore, the control sequence of the ground speed PTO mode under parking conditions is: start the engine, at this time the engine input shaft speed is idle, first engage the ground speed PTO synchronizer, and combine the ground speed PTO synchronizer to the ground speed input shaft, and the engagement process is no-load and no speed difference engagement; then engage the PTO gear engagement sleeve, and the engagement process is no-load and no speed difference engagement; then engage the PTO clutch, and the engagement process is no-load and no speed difference engagement, and finally realize the mechanical connection between the ground speed input shaft and the PTO output shaft.

[0021] Furthermore, the control sequence for switching the engine speed PTO mode to the ground speed PTO mode under driving conditions is: first disconnect the PTO clutch, at this time it is a no-load driving condition with speed, then disconnect the engine speed PTO synchronizer, and combine the ground speed PTO synchronizer. At this time, the PTO intermediate shaft completes the switching of connecting with the engine input shaft to the ground speed input shaft; then combine the PTO clutch to complete the mode switching.

[0022] Furthermore, the control sequence for switching from ground speed PTO mode to engine speed PTO mode under driving conditions is: first disconnect the PTO clutch, at this time it is a no-load and speed driving condition, then disconnect the ground speed PTO synchronizer, and combine with the engine speed PTO synchronizer. At this time, the PTO intermediate shaft completes the switching of connecting with the ground speed input shaft to the engine input shaft; then combine with the PTO clutch to complete the mode switching.

[0023] Furthermore, during the mode switching process, the friction work of the PTO clutch is synchronously detected. If the friction work is exceeded, the engagement of the synchronizer needs to be stopped.

[0024] A second aspect of the present invention provides a control device for a ground speed PTO, comprising:

[0025] An acquisition unit is configured to acquire the running state of the whole vehicle in response to the mode switching instruction;

[0026] A judging unit configured to judge whether the running state of the whole vehicle satisfies a preset working mode condition;

[0027] an execution unit configured to switch between different working modes according to a working mode condition being satisfied;

[0028] Among them, a ground speed PTO synchronizer and an engine speed PTO synchronizer are set in the execution unit, and the switching of working modes under different operating conditions is realized by controlling the connection or disconnection of the engine speed PTO synchronizer and the ground speed PTO synchronizer.

[0029] One or more of the above technical solutions have the following beneficial effects:

[0030] The invention 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 versatility of a 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 rotary tillers, balers, seed drills, etc.) matches the tractor ground speed, improving the efficiency and quality of the operation. The present invention realizes the control of the PTO mode through the electronic control system, replacing the traditional manual operation mode. The automated control method reduces the complexity of the driver's operation, reduces the possibility of operating errors, improves the safety of the operation, and enhances the modernization and intelligence level of the tractor PTO system.

[0032] The present invention effectively prevents the clutch from burning out due to overload by monitoring the friction work of the PTO clutch, thereby extending the service life of the clutch and reducing maintenance costs. The introduction of automated control and clutch protection mechanisms enhances the reliability of the entire PTO system and reduces downtime caused by improper operation or mechanical failure.

[0033] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0035] Figure 1 It is a structural diagram of a ground speed PTO system with a synchronizer in Embodiment 1 of the present invention;

[0036] Figure 2Flow chart of the control method of ground speed PTO 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 speed PTO gear pair and meshing sleeve, 9. 750 speed PTO gear pair and meshing sleeve, 10. 1000 speed PTO gear pair and meshing sleeve, PTO output shaft. DETAILED DESCRIPTION

[0038] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those 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 also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or their combinations;

[0040] Embodiment 1:

[0041] Embodiment 1 of the present invention provides a method for controlling a ground speed PTO, comprising the following steps:

[0042] Step 1: In response to a 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 realized by controlling the engagement or disconnection of the engine speed PTO synchronizer and the ground speed PTO synchronizer.

[0044] In a specific implementation, 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. Among them, the three sets of PTO gear pairs and meshing sleeves with different speed ratios are respectively a 540 speed PTO gear pair and meshing sleeve 8, a 750 speed PTO gear pair and meshing sleeve 9, and a 1000 speed PTO gear pair and meshing sleeve 10.

[0045] A synchronizer is a device used in transmissions. Its main function is to synchronize the speeds of different gears or shafts, thereby facilitating smooth gear shifting. Its structural components include synchronizer rings, sliders, springs, coupling sleeves, etc. It contains 1 input end and 2 output ends. Synchronizer engagement refers to the process of synchronizing the speeds of the input and output ends, and synchronizer disengagement refers to the process of separating the input and output ends.

[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 engaged, 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. After one set of the gear pair and the meshing sleeve is combined, it 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] Among them, the vehicle operating status includes parking conditions and driving conditions, and the working modes include engine speed PTO mode and ground speed PTO mode.

[0048] In a specific embodiment, 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 connected to the engine input shaft to realize the engine speed PTO mode, that is, the PTO speed is linearly related to the engine speed.

[0049] When the working mode is 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 to the ground speed input shaft to realize the ground speed PTO function, that is, the PTO speed is linearly related to the ground vehicle speed.

[0050] Step 2: Determine whether the vehicle operation status meets the preset working mode conditions.

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

[0052] This embodiment realizes the switching between the engine speed PTO mode and the ground speed PTO mode at different engine speeds or vehicle speeds by controlling the engagement or disconnection of two sets of synchronizers, the engine speed PTO mode and the ground speed PTO mode.

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

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

[0055] Case 2: The control sequence of the ground speed PTO mode under parking conditions is: start the engine, at which time the engine input shaft speed is idle, the PTO input shaft speed is 0rpm, and the ground vehicle speed is 0rpm; first engage the ground speed PTO synchronizer, and combine the ground speed PTO synchronizer to the ground speed input shaft, and the engagement process is a no-load and speed difference engagement; then engage the PTO gear pair and the meshing sleeve, and the engagement process is a no-load and speed difference engagement; then engage the PTO clutch, and the engagement process is a no-load and speed difference engagement, and finally realize the mechanical connection between the ground speed input shaft and the PTO output shaft.

[0056] Case 3: The control sequence of switching from the engine speed PTO mode to the ground speed PTO mode under driving conditions is: at this time, the engine input shaft speed is the engine speed, the PTO output shaft speed is the speed under this gear, and the vehicle speed is the current vehicle speed. At this time, the engine speed is linearly related to the PTO speed. First, disconnect the PTO clutch. At this time, it is a no-load driving condition with speed. Then disconnect the engine speed PTO synchronizer, and combine with the ground speed PTO synchronizer. At this time, the PTO intermediate shaft completes the switch from the engine input shaft to the ground speed input shaft; then combine with the PTO clutch to complete the mode switch. At this time, the PTO clutch needs to synchronize the speed difference between the PTO intermediate shaft and the PTO output shaft. This process synchronously detects the friction work of the PTO clutch. If the friction work exceeds the friction work, it is necessary to stop the engagement.

[0057] Case 4: The control sequence of switching from ground speed PTO mode to engine speed PTO mode under driving conditions is: at this time, the engine input shaft speed is the engine speed, the PTO output shaft speed is the speed under this gear, and the vehicle speed is the ground speed. At this time, the PTO speed is linearly related to the vehicle speed. First, disconnect the PTO clutch. At this time, it is a no-load driving condition with speed. Then disconnect the ground speed PTO synchronizer. Combine the engine speed PTO synchronizer. At this time, the PTO intermediate shaft completes the switch from the ground speed input shaft to the engine input shaft; then combine the PTO clutch (the clutch must synchronize the speed difference between the PTO intermediate shaft and the PTO output shaft) to complete the mode switch. This process synchronously detects the friction work of the PTO clutch. If the friction work exceeds the friction work, it is necessary to stop the engagement.

[0058] It should be noted that the principle of the clutch is to achieve power transmission by pressing the active friction plate and the passive friction plate. Therefore, the engagement described in this 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 mode switching process, the friction work of the PTO clutch is detected synchronously. Specifically, the friction work is calculated by detecting the speed difference between the active friction plate and the passive friction plate of the clutch, as well as the pressure of the two friction plates. If the friction work is exceeded, the engagement of the synchronizer must be stopped to prevent the clutch from burning out due to overheating.

[0060] The present invention can realize the electronic control of the PTO mode and realize the automatic switching between the engine speed PTO mode and the ground speed PTO mode without manual switching. At the same time, the friction work of the PTO clutch can be monitored to prevent the clutch from burning out.

[0061] Embodiment 2:

[0062] Embodiment 2 of the present invention provides a control device for a ground speed PTO, including:

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

[0064] A judging unit configured to judge whether the running state of the whole vehicle satisfies a preset working mode condition;

[0065] an execution unit configured to switch between different working modes according to a working mode condition being satisfied;

[0066] Among them, a ground speed PTO synchronizer and an engine speed PTO synchronizer are set in the execution unit, and the switching of working modes under different operating conditions is realized by controlling the connection or disconnection of the engine speed PTO synchronizer and the ground speed PTO synchronizer.

[0067] The steps involved in the above embodiment 2 correspond to those in the method embodiment 1. For the specific implementation method, please refer to the relevant description part of the embodiment 1.

[0068] Those skilled in the art should understand that the modules or steps of the present invention described above can be implemented by a general-purpose computer device, or alternatively, they can be implemented by a program code 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 made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. The present invention is not limited to any specific combination of hardware and software.

[0069] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A method for controlling a ground speed PTO, characterized in that: The following steps are involved: Responding to the mode switching instruction, obtaining the running state of the whole vehicle; Determining whether the vehicle operation state meets the preset working mode conditions; Switch to different working modes according to the working mode conditions met; Among them, a ground speed PTO synchronizer and an engine speed PTO synchronizer are set, and the switching of working modes under different operating conditions is realized by controlling the connection or disconnection of the engine speed PTO synchronizer and the ground speed PTO synchronizer.

2. The method for controlling a ground speed PTO according to claim 1, characterized in that: The vehicle operation status includes parking condition and driving condition, and the operation modes include engine speed PTO mode and ground speed PTO mode.

3. The method for controlling a ground speed PTO according to claim 2, characterized in that: 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 to the engine input shaft to realize the engine speed PTO mode, that is, the PTO speed is linearly related to the engine speed.

4. The method for controlling a ground speed PTO according to claim 2, characterized in that: When the working mode is ground speed PTO mode, the ground speed PTO synchronizer is combined with the ground speed input shaft. At this time, the PTO input shaft and the ground speed input shaft are connected through the wheel side output shaft to realize the ground speed PTO function, that is, the PTO speed is linearly related to the ground vehicle speed.

5. The method for controlling a ground speed PTO according to claim 2, characterized in that: The control sequence of the engine speed PTO mode under parking conditions is: start the engine, at this time the engine input shaft speed is idle, first engage the engine speed PTO synchronizer, and combine the engine speed PTO synchronizer to the engine input shaft, and the engagement process is no-load with speed difference engagement; then combine the PTO gear pair and the meshing sleeve, and the engagement process is no-load without speed difference engagement; then combine the PTO clutch, and the engagement process is loaded with speed difference engagement, and finally realize the mechanical connection between the engine input shaft and the PTO output shaft.

6. The method for controlling a ground speed PTO according to claim 2, characterized in that: The control sequence of the ground speed PTO mode under parking conditions is: start the engine, at this time the engine input shaft speed is idle, first engage the ground speed PTO synchronizer, and combine the ground speed PTO synchronizer to the ground speed input shaft, and the engagement process is no-load and no speed difference engagement; then engage the PTO gear engagement sleeve, and the engagement process is no-load and no speed difference engagement; then engage the PTO clutch, and the engagement process is no-load and no speed difference engagement, and finally realize the mechanical connection between the ground speed input shaft and the PTO output shaft.

7. The method for controlling a ground speed PTO according to claim 2, characterized in that: The control sequence for switching from engine speed PTO mode to ground speed PTO mode under driving conditions is: first disconnect the PTO clutch, at this time it is a no-load driving condition with speed, then disconnect the engine speed PTO synchronizer, and engage the ground speed PTO synchronizer. At this time, the PTO intermediate shaft completes the switching of the connection with the engine input shaft to the ground speed input shaft; then engage the PTO clutch to complete the mode switching.

8. The method for controlling a ground speed PTO according to claim 2, characterized in that: The control sequence for switching from ground speed PTO mode to engine speed PTO mode under driving conditions is: first disconnect the PTO clutch, at this time it is a no-load and speed driving condition, then disconnect the ground speed PTO synchronizer, and combine with the engine speed PTO synchronizer. At this time, the PTO intermediate shaft completes the switching of the connection with the ground speed input shaft to the engine input shaft; then combine with the PTO clutch to complete the mode switching.

9. The method for controlling a ground speed PTO according to claim 1, characterized in that: During the mode switching process, the friction work of the PTO clutch is detected synchronously. If the friction work is exceeded, the engagement of the synchronizer needs to be stopped.

10. A ground speed PTO control device, characterized in that: include: An acquisition unit is configured to acquire the running state of the whole vehicle in response to the mode switching instruction; A judging unit configured to judge whether the running state of the whole vehicle satisfies a preset working mode condition; an execution unit configured to switch between different working modes according to a working mode condition being satisfied; Among them, a ground speed PTO synchronizer and an engine speed PTO synchronizer are set in the execution unit, and the switching of working modes under different operating conditions is realized by controlling the connection or disconnection of the engine speed PTO synchronizer and the ground speed PTO synchronizer.

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