A four-wheel drive control system and control method for a harvesting machine

Abstract

The application provides a four-wheel drive control system and method for a harvesting machine. The four-wheel drive control system for the harvesting machine comprises a gearbox, a gear position sensor, a transfer case, a shift rocker, a first electric push rod, an intermediate transmission shaft, a rear drive axle, a reduction and separation case, a shift handle, a second electric push rod and a four-wheel drive controller. The gear position sensor is installed on the gearbox, the gearbox is connected with the transfer case, the shift rocker is installed on the transfer case, the first electric push rod is connected with the shift rocker, the transfer case is connected with the reduction and separation case through the intermediate transmission shaft, the reduction and separation case is connected with the rear drive axle, the shift handle is installed on the reduction and separation case, the second electric push rod is connected with the shift handle, and the gear position sensor, the first electric push rod and the second electric push rod are connected with the four-wheel drive controller. When the reduction and separation case and the transfer case are combined to realize a two-wheel drive state, the transmission shaft stops rotating, the transmission shaft is prevented from being reversely dragged, the components of the transmission shaft are prevented from being damaged, and the two-wheel drive state is avoided in the driving gear position.

Description

Technical Field

[0001] This invention relates to the field of four-wheel drive systems for harvesting machinery, and in particular to a four-wheel drive control system and control method for harvesting machinery. Background Technology

[0002] When the four-wheel drive is disengaged, the drive shaft is dragged backward when the machine is traveling at high speed, which can damage the drive shaft components. When the four-wheel drive is engaged in driving gear (third gear), excessive wear of the steering tires can easily occur, the drive shaft speed is too high, and abnormal noise and vibration can be generated, which can lead to drive shaft damage. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a four-wheel drive control system and control method for harvesting machinery, which addresses the shortcomings of the prior art.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A four-wheel drive control system for harvesting machinery includes: a gearbox, a gear position sensor, a transfer case for distributing power, a shift rocker arm for switching drive modes, a first electric push rod for driving the shift rocker arm, an intermediate drive shaft, a rear drive axle, a reduction gearbox for switching the transmission between the intermediate drive shaft and the rear drive axle, a shift lever for switching drive modes, a second electric push rod for driving the shift lever, and a four-wheel drive controller. The gear position sensor is mounted on the gearbox, the gearbox is connected to the transfer case, the shift rocker arm is mounted on the transfer case, the first electric push rod is connected to the shift rocker arm, the transfer case is connected to the reduction gearbox via the intermediate drive shaft, the reduction gearbox is connected to the rear drive axle, the shift lever is mounted on the reduction gearbox, the second electric push rod is connected to the shift lever, and the gear position sensor, the first electric push rod, and the second electric push rod are all connected to the four-wheel drive controller.

[0005] The beneficial effects of adopting the technical solution of this invention are as follows: the transfer case can switch the transmission between the intermediate drive shaft and the gearbox, and the reduction gearbox can switch the transmission between the intermediate drive shaft and the rear drive axle. The combination of the reduction gearbox and the transfer case enables the intermediate drive shaft to stop rotating in two-wheel drive mode, effectively reducing the risk of support failure of the intermediate drive shaft. At the same time, the reduction gearbox of the reduction gearbox protects the bearings and gears of the rear drive axle. It prevents the intermediate drive shaft from being dragged backward, prevents damage to drive shaft components, avoids engaging four-wheel drive in the driving gear (third gear), prevents excessive wear of the steering tires, prevents excessive rotational speed of the drive shaft, prevents abnormal noise and vibration, and avoids drive shaft damage.

[0006] Furthermore, the transfer case is equipped with a first separation sensor and a first engagement sensor, and the deceleration separation case is equipped with a second separation sensor and a second engagement sensor. The first separation sensor, the first engagement sensor, the second separation sensor, and the second engagement sensor are all connected to the four-wheel drive controller.

[0007] The beneficial effects of adopting the above-mentioned further technical solution are: the first separation sensor, the first engagement sensor, the second separation sensor, and the second engagement sensor are used to detect the drive mode of the transfer case and the reduction gearbox, which makes it easier for the four-wheel drive controller to accurately determine the status of the transfer case and the reduction gearbox.

[0008] Furthermore, the four-wheel drive controller is connected to a display screen.

[0009] The beneficial effects of adopting the above-mentioned further technical solution are: the display screen makes it easy to display the prompts and working status information sent by the four-wheel drive controller on the display screen, so that users can intuitively observe the relevant information.

[0010] Furthermore, the four-wheel drive controller is connected to a four-wheel drive switch.

[0011] The beneficial effects of adopting the above-mentioned further technical solutions are: the setting of the four-wheel drive switch makes it convenient for users to start and stop the four-wheel drive according to actual needs, and facilitates the switching between four-wheel drive and two-wheel drive modes.

[0012] Furthermore, one end of the first electric push rod is connected to the shift rocker arm, the other end of the first electric push rod is connected to the transfer case, one end of the second electric push rod is connected to the shift handle, and the other end of the second electric push rod is connected to the rear drive axle.

[0013] The beneficial effects of adopting the above-mentioned further technical solutions are: the structural and connection design of the electric push rod, shift rocker arm and shift handle are convenient for installation and maintenance, facilitate automatic engagement and disengagement of the transfer case and deceleration separation case, have a simple structure and improve automation.

[0014] Furthermore, the present invention also provides a four-wheel drive control method for harvesting machinery, based on any one of the above-described four-wheel drive control systems for harvesting machinery, the four-wheel drive control method for harvesting machinery comprising:

[0015] S1. The four-wheel drive controller determines whether the harvesting machinery is in four-wheel drive mode.

[0016] S2. When the harvesting machinery is not in four-wheel drive mode, the gear position sensor obtains gear position information;

[0017] S3. The four-wheel drive controller determines whether the harvesting machinery is in the 3rd gear state based on the gear information.

[0018] S4. When the harvesting machinery is in 3rd gear, the four-wheel drive controller determines whether the user has input a four-wheel drive engagement command.

[0019] S5. When the user inputs a command to engage four-wheel drive, the four-wheel drive controller controls the first and second electric push rods to remain inactive and generates the message "3rd gear prohibits engaging four-wheel drive".

[0020] S6, the four-wheel drive controller sends the "3rd gear cannot engage four-wheel drive" message to the display screen.

[0021] The beneficial effects of adopting the technical solution of this invention are as follows: The display screen shows "3rd gear prohibited from engaging four-wheel drive": A sensor switch (gear position sensor) is added to the 3rd gear position of the transmission. When the vehicle is in 3rd gear, the sensor switch transmits a signal to the controller (four-wheel drive controller). When the user touches the four-wheel drive switch, the electric push lever does not move, and then the controller transmits a signal to the display screen showing "3rd gear prohibited from engaging four-wheel drive". The transfer case can switch the transmission between the intermediate drive shaft and the transmission, and the reduction gearbox can switch the transmission between the intermediate drive shaft and the rear drive axle. The combination of the reduction gearbox and the transfer case enables the intermediate drive shaft to stop rotating in two-wheel drive mode, effectively reducing the risk of support failure of the intermediate drive shaft. At the same time, the reduction gearbox of the reduction gearbox protects the bearings and gears of the rear drive axle. It prevents the intermediate drive shaft from being dragged backward, prevents damage to drive shaft components, avoids engaging four-wheel drive in the driving gear (3rd gear), prevents excessive wear of the steering tires, prevents excessive rotation speed of the drive shaft, prevents abnormal noise and vibration, and avoids drive shaft damage.

[0022] Further, step S1 includes:

[0023] S11. When the harvesting machinery is in four-wheel drive mode, the gear position sensor determines whether the harvesting machinery has shifted from 2nd gear to 3rd gear based on the gear position information.

[0024] S12. When the harvesting machinery shifts from 2nd gear to 3rd gear, the four-wheel drive controller generates the first separation command.

[0025] S13. The first electric push rod and the second electric push rod drive the shift rocker arm and the shift handle to the separation position according to the first separation command.

[0026] S14, The four-wheel drive controller generates the message "Four-wheel drive disengaged in 3rd gear";

[0027] S15, the four-wheel drive controller sends the message "four-wheel drive disengaged in 3rd gear" to the display screen.

[0028] The beneficial effects of adopting the above-mentioned further technical solution are: adding a 3-speed four-wheel drive automatic disengagement control strategy, improving stability and reliability. The added 3-speed four-wheel drive automatic disengagement control strategy: When four-wheel drive is engaged and in 3rd gear, a signal is transmitted to the controller (four-wheel drive controller) via the 3rd gear position switch (gear position sensor). The controller then controls the front and rear electric push rods (first and second electric push rods) to disengage the four-wheel drive. The controller then transmits a signal to the display screen to show "Four-wheel drive disengaged in 3rd gear".

[0029] Further, step S13 includes:

[0030] S131, the first separation sensor and the first combination sensor acquire the first drive mode information of the transfer case;

[0031] S132, the second separation sensor and the second combination sensor acquire the second drive mode information of the deceleration separation box;

[0032] S133 and the four-wheel drive controller respectively obtain the first theoretical separation stroke of the first electric push rod and the second theoretical separation stroke of the second electric push rod;

[0033] S134. The four-wheel drive controller determines whether the transfer case and the reduction gearbox have successfully separated based on the first drive mode information, the first separation theoretical stroke, the second drive mode information, and the second separation theoretical stroke.

[0034] When both the transfer case and the deceleration release case are successfully separated, proceed to step S14;

[0035] When the transfer case and / or reduction gearbox fail to disengage, the four-wheel drive controller generates a "four-wheel drive disengagement failed in 3rd gear" message.

[0036] The four-wheel drive controller sends the message "Four-wheel drive disengagement failed in 3rd gear" to the display screen.

[0037] The beneficial effects of adopting the above-mentioned further technical solution are as follows: If an abnormal fault occurs (four-wheel drive cannot automatically disengage), the controller transmits a signal to the display screen, causing a red light to flash and displaying "Four-wheel drive disengagement failed," reminding the user to find the cause of the fault or manually disengage the four-wheel drive. Four-wheel drive engagement / disengagement control strategy: Electric push rod stroke control + gear position switch sensing: The controller controls the theoretical stroke of the electric push rod while simultaneously sensing signals from the gear position switches (first disengagement sensor, first engagement sensor, second disengagement sensor, and second engagement sensor) on the transfer case and the rear drive axle separation case (reduction separation case). Engagement / disengagement requires simultaneous fulfillment of the stroke requirements and the gear position switch signal before the controller transmits a signal to the display screen indicating "Four-wheel drive engaged" / the four-wheel drive icon illuminates, ensuring complete disengagement and engagement of the four-wheel drive. This prevents rocker arm stroke errors, improves signal accuracy, and solves problems such as incomplete disengagement causing gear grinding, incomplete gear meshing, and affecting gear strength.

[0038] Further, step S3 includes:

[0039] S31. When the harvesting machinery is not in the 3rd gear position, the four-wheel drive controller determines whether the user inputs a four-wheel drive engagement command or a four-wheel drive disengagement command through the four-wheel drive switch.

[0040] S32. When the user inputs a four-wheel drive engagement command, the four-wheel drive controller generates the engagement command.

[0041] S33, the first electric push rod and the second electric push rod drive the shift rocker arm and shift handle to the engagement position according to the engagement command;

[0042] S34. When the user inputs a disengagement command for the four-wheel drive system, the four-wheel drive controller generates a second disengagement command.

[0043] S35, the first electric push rod and the second electric push rod drive the shift rocker arm and the shift handle to the separation position in a one-to-one correspondence according to the second separation command.

[0044] The beneficial effects of adopting the above-mentioned further technical solution are: it allows users to engage four-wheel drive only in non-third gear, improving reliability. In first or second gear, it receives and executes four-wheel drive commands, preventing engagement of four-wheel drive in third gear, avoiding engagement of four-wheel drive in the driving gear (third gear), preventing excessive wear on steering tires, preventing excessive rotational speed of the drive shaft, preventing abnormal noise and vibration, and avoiding damage to the drive shaft.

[0045] Further, step S33 includes:

[0046] S331, the first separation sensor and the first combination sensor acquire the third drive mode information of the transfer case;

[0047] S332, the second separation sensor and the second combination sensor acquire the fourth drive mode information of the deceleration separation box;

[0048] S333 and the four-wheel drive controller respectively obtain the first theoretical engagement stroke of the first electric push rod and the second theoretical engagement stroke of the second electric push rod;

[0049] S334, the four-wheel drive controller determines whether the transfer case and the reduction gearbox are successfully engaged based on the third drive mode information, the first engagement theoretical stroke, the fourth drive mode information, and the second engagement theoretical stroke.

[0050] S335. When both the transfer case and the reduction gearbox are successfully engaged, the four-wheel drive controller generates "four-wheel drive engaged information".

[0051] S336, the four-wheel drive controller sends the "four-wheel drive engaged" information to the display screen for display;

[0052] Step S35 includes:

[0053] S351, the first separation sensor and the first combination sensor acquire the fifth drive mode information of the transfer case;

[0054] S352, the second separation sensor and the second combination sensor acquire the sixth drive mode information of the deceleration separation box;

[0055] S353 and the four-wheel drive controller respectively obtain the third theoretical separation stroke of the first electric push rod and the fourth theoretical separation stroke of the second electric push rod.

[0056] S354, the four-wheel drive controller determines whether the transfer case and the reduction gearbox have successfully disengaged based on the fifth drive mode information, the third separation theoretical stroke, the sixth drive mode information, and the fourth separation theoretical stroke;

[0057] When both the transfer case and the reduction gearbox are successfully disengaged, the four-wheel drive controller generates a "four-wheel drive disengaged" message.

[0058] S356, the four-wheel drive controller sends the "four-wheel drive disengaged" message to the display screen.

[0059] The beneficial effects of adopting the above-mentioned further technical solution are as follows: Four-wheel drive engagement / disengagement control strategy: Electric push rod stroke control + gear position switch sensing: The controller controls the theoretical stroke of the electric push rod while simultaneously sensing signals from the gear position switches (first disengagement sensor, first engagement sensor, second disengagement sensor, and second engagement sensor) on the transfer case and the rear drive axle separation case (reduction separation case). During engagement / disengagement, both the stroke requirement and the gear position switch signal must be met simultaneously before the controller transmits a signal to the display screen indicating "Four-wheel drive engaged" / the four-wheel drive icon illuminates, ensuring complete engagement and disengagement of the four-wheel drive system. This prevents rocker arm stroke errors, improves signal accuracy, and solves problems such as incomplete disengagement causing gear wear, incomplete gear meshing, and affecting gear strength.

[0060] The advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0061] Figure 1 This is one of the structural schematic diagrams of the four-wheel drive control system for harvesting machinery provided in an embodiment of the present invention.

[0062] Figure 2 This is the second schematic diagram of the four-wheel drive control system for harvesting machinery provided in an embodiment of the present invention.

[0063] Figure 3 This is the third schematic diagram of the four-wheel drive control system for harvesting machinery provided in an embodiment of the present invention.

[0064] Figure 4 This is a schematic flowchart of a four-wheel drive control method for harvesting machinery provided in an embodiment of the present invention.

[0065] The following are the reference numerals: 1. Gearbox; 2. Gear position sensor; 3. Transfer case; 4. Shift rocker arm; 5. First electric push rod; 6. Intermediate drive shaft; 7. Rear drive axle; 8. Reduction gearbox; 9. Shift lever; 10. Second electric push rod; 11. Four-wheel drive controller; 12. First separation sensor; 13. First engagement sensor; 14. Second separation sensor; 15. Second engagement sensor; 16. Display screen; 17. Four-wheel drive switch. Detailed Implementation

[0066] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0067] like Figures 1 to 3As shown, this embodiment of the invention provides a four-wheel drive control system for harvesting machinery, including: a gearbox 1, a gear position sensor 2, a transfer case 3 for distributing power, a shift rocker arm 4 for switching drive modes, a first electric push rod 5 for moving the shift rocker arm 4, an intermediate drive shaft 6, a rear drive axle 7, a reduction gearbox 8 for switching the transmission between the intermediate drive shaft 6 and the rear drive axle 7, a shift lever 9 for switching drive modes, a second electric push rod 10 for moving the shift lever 9, and a four-wheel drive controller 11. The gear position sensor 2 is installed in the gearbox. 1. The gearbox 1 is connected to the transfer case 3. The shift rocker arm 4 is mounted on the transfer case 3. The first electric push rod 5 is connected to the shift rocker arm 4. The transfer case 3 is connected to the reduction gearbox 8 through the intermediate drive shaft 6. The reduction gearbox 8 is connected to the rear drive axle 7. The shift lever 9 is mounted on the reduction gearbox 8. The second electric push rod 10 is connected to the shift lever 9. The gear position sensor 2, the first electric push rod 5, and the second electric push rod 10 are all connected to the four-wheel drive controller 11.

[0068] The beneficial effects of adopting the technical solution of this invention are as follows: the transfer case can switch the transmission between the intermediate drive shaft and the gearbox, and the reduction gearbox can switch the transmission between the intermediate drive shaft and the rear drive axle. The combination of the reduction gearbox and the transfer case enables the intermediate drive shaft to stop rotating in two-wheel drive mode, effectively reducing the risk of support failure of the intermediate drive shaft. At the same time, the reduction gearbox of the reduction gearbox protects the bearings and gears of the rear drive axle. It prevents the intermediate drive shaft from being dragged backward, prevents damage to drive shaft components, avoids engaging four-wheel drive in the driving gear (third gear), prevents excessive wear of the steering tires, prevents excessive rotational speed of the drive shaft, prevents abnormal noise and vibration, and avoids drive shaft damage.

[0069] like Figures 1 to 3 As shown, the transfer case 3 is further provided with a first separation sensor 12 and a first engagement sensor 13, and the deceleration separation case 8 is provided with a second separation sensor 14 and a second engagement sensor 15. The first separation sensor 12, the first engagement sensor 13, the second separation sensor 14 and the second engagement sensor 15 are all connected to the four-wheel drive controller 11.

[0070] The beneficial effects of adopting the above-mentioned further technical solution are: the first separation sensor, the first engagement sensor, the second separation sensor, and the second engagement sensor are used to detect the drive mode of the transfer case and the reduction gearbox, which makes it easier for the four-wheel drive controller to accurately determine the status of the transfer case and the reduction gearbox.

[0071] like Figures 1 to 3 As shown, the four-wheel drive controller 11 is further connected to a display screen 16.

[0072] The beneficial effects of adopting the above-mentioned further technical solution are: the display screen makes it easy to display the prompts and working status information sent by the four-wheel drive controller on the display screen, so that users can intuitively observe the relevant information.

[0073] like Figures 1 to 3 As shown, the four-wheel drive controller 11 is further connected to a four-wheel drive switch 17.

[0074] The beneficial effects of adopting the above-mentioned further technical solutions are: the setting of the four-wheel drive switch makes it convenient for users to start and stop the four-wheel drive according to actual needs, and facilitates the switching between four-wheel drive and two-wheel drive modes.

[0075] like Figures 1 to 3 As shown, one end of the first electric push rod 5 is connected to the shift rocker arm 4, the other end of the first electric push rod 15 is connected to the transfer case 3, one end of the second electric push rod 10 is connected to the shift handle 9, and the other end of the second electric push rod 10 is connected to the rear drive axle 7.

[0076] The beneficial effects of adopting the above-mentioned further technical solutions are: the structural and connection design of the electric push rod, shift rocker arm and shift handle are convenient for installation and maintenance, facilitate automatic engagement and disengagement of the transfer case and deceleration separation case, have a simple structure and improve automation.

[0077] like Figure 4 As shown, in addition, the present invention also provides a four-wheel drive control method for harvesting machinery, based on any one of the above-described four-wheel drive control systems for harvesting machinery, the four-wheel drive control method for harvesting machinery comprising:

[0078] S1. The four-wheel drive controller determines whether the harvesting machinery is in four-wheel drive mode.

[0079] S2. When the harvesting machinery is not in four-wheel drive mode, the gear position sensor obtains gear position information;

[0080] S3. The four-wheel drive controller determines whether the harvesting machinery is in the 3rd gear state based on the gear information.

[0081] S4. When the harvesting machinery is in 3rd gear, the four-wheel drive controller determines whether the user has input a four-wheel drive engagement command.

[0082] S5. When the user inputs a command to engage four-wheel drive, the four-wheel drive controller controls the first and second electric push rods to remain inactive and generates the message "3rd gear prohibits engaging four-wheel drive".

[0083] S6, the four-wheel drive controller sends the "3rd gear cannot engage four-wheel drive" message to the display screen.

[0084] The beneficial effects of adopting the technical solution of this invention are as follows: The display screen shows "3rd gear prohibited from engaging four-wheel drive": A sensor switch (gear position sensor) is added to the 3rd gear position of the transmission. When the vehicle is in 3rd gear, the sensor switch transmits a signal to the controller (four-wheel drive controller). When the user touches the four-wheel drive switch, the electric push lever does not move, and then the controller transmits a signal to the display screen showing "3rd gear prohibited from engaging four-wheel drive". The transfer case can switch the transmission between the intermediate drive shaft and the transmission, and the reduction gearbox can switch the transmission between the intermediate drive shaft and the rear drive axle. The combination of the reduction gearbox and the transfer case enables the intermediate drive shaft to stop rotating in two-wheel drive mode, effectively reducing the risk of support failure of the intermediate drive shaft. At the same time, the reduction gearbox of the reduction gearbox protects the bearings and gears of the rear drive axle. It prevents the intermediate drive shaft from being dragged backward, prevents damage to drive shaft components, avoids engaging four-wheel drive in the driving gear (3rd gear), prevents excessive wear of the steering tires, prevents excessive rotation speed of the drive shaft, prevents abnormal noise and vibration, and avoids drive shaft damage.

[0085] Further, step S1 includes:

[0086] S11. When the harvesting machinery is in four-wheel drive mode, the gear position sensor determines whether the harvesting machinery has shifted from 2nd gear to 3rd gear based on the gear position information.

[0087] S12. When the harvesting machinery shifts from 2nd gear to 3rd gear, the four-wheel drive controller generates the first separation command.

[0088] S13. The first electric push rod and the second electric push rod drive the shift rocker arm and the shift handle to the separation position according to the first separation command.

[0089] S14, The four-wheel drive controller generates the message "Four-wheel drive disengaged in 3rd gear";

[0090] S15, the four-wheel drive controller sends the message "four-wheel drive disengaged in 3rd gear" to the display screen.

[0091] The beneficial effects of adopting the above-mentioned further technical solution are: adding a 3-speed four-wheel drive automatic disengagement control strategy, improving stability and reliability. The added 3-speed four-wheel drive automatic disengagement control strategy: When four-wheel drive is engaged and in 3rd gear, a signal is transmitted to the controller (four-wheel drive controller) via the 3rd gear position switch (gear position sensor). The controller then controls the front and rear electric push rods (first and second electric push rods) to disengage the four-wheel drive. The controller then transmits a signal to the display screen to show "Four-wheel drive disengaged in 3rd gear".

[0092] Further, step S13 includes:

[0093] S131, the first separation sensor and the first combination sensor acquire the first drive mode information of the transfer case;

[0094] S132, the second separation sensor and the second combination sensor acquire the second drive mode information of the deceleration separation box;

[0095] S133 and the four-wheel drive controller respectively obtain the first theoretical separation stroke of the first electric push rod and the second theoretical separation stroke of the second electric push rod;

[0096] S134. The four-wheel drive controller determines whether the transfer case and the reduction gearbox have successfully separated based on the first drive mode information, the first separation theoretical stroke, the second drive mode information, and the second separation theoretical stroke.

[0097] When both the transfer case and the deceleration release case are successfully separated, proceed to step S14;

[0098] When the transfer case and / or reduction gearbox fail to disengage, the four-wheel drive controller generates a "four-wheel drive disengagement failed in 3rd gear" message.

[0099] The four-wheel drive controller sends the message "Four-wheel drive disengagement failed in 3rd gear" to the display screen.

[0100] The beneficial effects of adopting the above-mentioned further technical solution are as follows: If an abnormal fault occurs (four-wheel drive cannot automatically disengage), the controller transmits a signal to the display screen, causing a red light to flash and displaying "Four-wheel drive disengagement failed," reminding the user to find the cause of the fault or manually disengage the four-wheel drive. Four-wheel drive engagement / disengagement control strategy: Electric push rod stroke control + gear position switch sensing: The controller controls the theoretical stroke of the electric push rod while simultaneously sensing signals from the gear position switches (first disengagement sensor, first engagement sensor, second disengagement sensor, and second engagement sensor) on the transfer case and the rear drive axle separation case (reduction separation case). Engagement / disengagement requires simultaneous fulfillment of the stroke requirements and the gear position switch signal before the controller transmits a signal to the display screen indicating "Four-wheel drive engaged" / the four-wheel drive icon illuminates, ensuring complete disengagement and engagement of the four-wheel drive. This prevents rocker arm stroke errors, improves signal accuracy, and solves problems such as incomplete disengagement causing gear grinding, incomplete gear meshing, and affecting gear strength.

[0101] Further, step S3 includes:

[0102] S31. When the harvesting machinery is not in the 3rd gear position, the four-wheel drive controller determines whether the user inputs a four-wheel drive engagement command or a four-wheel drive disengagement command through the four-wheel drive switch.

[0103] S32. When the user inputs a four-wheel drive engagement command, the four-wheel drive controller generates the engagement command.

[0104] S33, the first electric push rod and the second electric push rod drive the shift rocker arm and shift handle to the engagement position according to the engagement command;

[0105] S34. When the user inputs a disengagement command for the four-wheel drive system, the four-wheel drive controller generates a second disengagement command.

[0106] S35, the first electric push rod and the second electric push rod drive the shift rocker arm and the shift handle to the separation position in a one-to-one correspondence according to the second separation command.

[0107] The beneficial effects of adopting the above-mentioned further technical solution are: it allows users to engage four-wheel drive only in non-third gear, improving reliability. In first or second gear, it receives and executes four-wheel drive commands, preventing engagement of four-wheel drive in third gear, avoiding engagement of four-wheel drive in the driving gear (third gear), preventing excessive wear on steering tires, preventing excessive rotational speed of the drive shaft, preventing abnormal noise and vibration, and avoiding damage to the drive shaft.

[0108] Further, step S33 includes:

[0109] S331, the first separation sensor and the first combination sensor acquire the third drive mode information of the transfer case;

[0110] S332, the second separation sensor and the second combination sensor acquire the fourth drive mode information of the deceleration separation box;

[0111] S333 and the four-wheel drive controller respectively obtain the first theoretical engagement stroke of the first electric push rod and the second theoretical engagement stroke of the second electric push rod;

[0112] S334, the four-wheel drive controller determines whether the transfer case and the reduction gearbox are successfully engaged based on the third drive mode information, the first engagement theoretical stroke, the fourth drive mode information, and the second engagement theoretical stroke.

[0113] S335. When both the transfer case and the reduction gearbox are successfully engaged, the four-wheel drive controller generates "four-wheel drive engaged information".

[0114] S336, the four-wheel drive controller sends the "four-wheel drive engaged" information to the display screen for display;

[0115] Step S35 includes:

[0116] S351, the first separation sensor and the first combination sensor acquire the fifth drive mode information of the transfer case;

[0117] S352, the second separation sensor and the second combination sensor acquire the sixth drive mode information of the deceleration separation box;

[0118] S353 and the four-wheel drive controller respectively obtain the third theoretical separation stroke of the first electric push rod and the fourth theoretical separation stroke of the second electric push rod.

[0119] S354, the four-wheel drive controller determines whether the transfer case and the reduction gearbox have successfully disengaged based on the fifth drive mode information, the third separation theoretical stroke, the sixth drive mode information, and the fourth separation theoretical stroke;

[0120] When both the transfer case and the reduction gearbox are successfully disengaged, the four-wheel drive controller generates a "four-wheel drive disengaged" message.

[0121] S356, the four-wheel drive controller sends the "four-wheel drive disengaged" message to the display screen.

[0122] The beneficial effects of adopting the above-mentioned further technical solution are as follows: Four-wheel drive engagement / disengagement control strategy: Electric push rod stroke control + gear position switch sensing: The controller controls the theoretical stroke of the electric push rod while simultaneously sensing signals from the gear position switches (first disengagement sensor, first engagement sensor, second disengagement sensor, and second engagement sensor) on the transfer case and the rear drive axle separation case (reduction separation case). During engagement / disengagement, both the stroke requirement and the gear position switch signal must be met simultaneously before the controller transmits a signal to the display screen indicating "Four-wheel drive engaged" / the four-wheel drive icon illuminates, ensuring complete engagement and disengagement of the four-wheel drive system. This prevents rocker arm stroke errors, improves signal accuracy, and solves problems such as incomplete disengagement causing gear wear, incomplete gear meshing, and affecting gear strength.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A four-wheel drive control method for harvesting machinery, characterized in that, include: S1. The four-wheel drive controller determines whether the harvesting machinery is in four-wheel drive mode. S2. When the harvesting machinery is not in four-wheel drive mode, the gear position sensor obtains gear position information; S3. The four-wheel drive controller determines whether the harvesting machinery is in the 3rd gear state based on the gear information. S4. When the harvesting machinery is in 3rd gear, the four-wheel drive controller determines whether the user has input a four-wheel drive engagement command. S5. When the user inputs a command to engage four-wheel drive, the four-wheel drive controller controls the first and second electric push rods to remain inactive and generates the message "3rd gear prohibits engaging four-wheel drive". S6, the four-wheel drive controller sends the "3rd gear cannot engage four-wheel drive" message to the display screen; Step S1 includes: S11. When the harvesting machinery is in four-wheel drive mode, the gear position sensor determines whether the harvesting machinery has shifted from 2nd gear to 3rd gear based on the gear position information. S12. When the harvesting machinery shifts from 2nd gear to 3rd gear, the four-wheel drive controller generates the first separation command. S13. The first electric push rod and the second electric push rod drive the shift rocker arm and the shift handle to the separation position according to the first separation command. S14, The four-wheel drive controller generates the message "Four-wheel drive disengaged in 3rd gear"; S15, the four-wheel drive controller sends the message "four-wheel drive disengaged in 3rd gear" to the display screen for display; Step S13 includes: S131, the first separation sensor and the first combination sensor acquire the first drive mode information of the transfer case; S132, the second separation sensor and the second combination sensor acquire the second drive mode information of the deceleration separation box; S133 and the four-wheel drive controller respectively obtain the first theoretical separation stroke of the first electric push rod and the second theoretical separation stroke of the second electric push rod; S134. The four-wheel drive controller determines whether the transfer case and the reduction gearbox have successfully separated based on the first drive mode information, the first separation theoretical stroke, the second drive mode information, and the second separation theoretical stroke. When both the transfer case and the deceleration release case are successfully separated, proceed to step S14; When the transfer case and / or reduction gearbox fail to disengage, the four-wheel drive controller generates the message "Four-wheel drive disengagement failed in 3rd gear". The four-wheel drive controller sends the message "Four-wheel drive disengagement failed in 3rd gear" to the display screen.

2. The four-wheel drive control method for harvesting machinery according to claim 1, characterized in that, Step S3 includes: S31. When the harvesting machinery is not in the 3rd gear position, the four-wheel drive controller determines whether the user inputs a four-wheel drive engagement command or a four-wheel drive disengagement command through the four-wheel drive switch. S32. When the user inputs a four-wheel drive engagement command, the four-wheel drive controller generates the engagement command. S33, the first electric push rod and the second electric push rod drive the shift rocker arm and shift handle to the engagement position according to the engagement command; S34. When the user inputs a disengagement command for the four-wheel drive system, the four-wheel drive controller generates a second disengagement command. S35, the first electric push rod and the second electric push rod drive the shift rocker arm and the shift handle to the separation position in a one-to-one correspondence according to the second separation command.

3. The four-wheel drive control method for harvesting machinery according to claim 2, characterized in that, Step S33 includes: S331, the first separation sensor and the first combination sensor acquire the third drive mode information of the transfer case; S332, the second separation sensor and the second combination sensor acquire the fourth drive mode information of the deceleration separation box; S333 and the four-wheel drive controller respectively obtain the first theoretical engagement stroke of the first electric push rod and the second theoretical engagement stroke of the second electric push rod; S334, the four-wheel drive controller determines whether the transfer case and the reduction gearbox are successfully engaged based on the third drive mode information, the first engagement theoretical stroke, the fourth drive mode information, and the second engagement theoretical stroke. S335. When both the transfer case and the reduction gearbox are successfully engaged, the four-wheel drive controller generates the message "Four-wheel drive engaged". S336, the four-wheel drive controller sends the "four-wheel drive engaged" message to the display screen; Step S35 includes: S351, the first separation sensor and the first combination sensor acquire the fifth drive mode information of the transfer case; S352, the second separation sensor and the second combination sensor acquire the sixth drive mode information of the deceleration separation box; S353 and the four-wheel drive controller respectively obtain the third theoretical separation stroke of the first electric push rod and the fourth theoretical separation stroke of the second electric push rod. S354, the four-wheel drive controller determines whether the transfer case and the reduction gearbox have successfully disengaged based on the fifth drive mode information, the third separation theoretical stroke, the sixth drive mode information, and the fourth separation theoretical stroke; When both the transfer case and the reduction gearbox are successfully disengaged, the four-wheel drive controller generates a "four-wheel drive disengaged" message. S356, the four-wheel drive controller sends the "four-wheel drive disengaged" message to the display screen.

4. A four-wheel drive control system for harvesting machinery, characterized in that, A harvesting machinery four-wheel drive control method for implementing any one of claims 1 to 3, the harvesting machinery four-wheel drive control system includes: a gearbox, a gear position sensor, a transfer case for distributing power, a shift rocker arm for switching drive modes, a first electric push rod for driving the shift rocker arm, an intermediate drive shaft, a rear drive axle, a reduction gearbox for switching the transmission between the intermediate drive shaft and the rear drive axle, a shift lever for switching drive modes, a second electric push rod for driving the shift lever, and a four-wheel drive controller. The gear position sensor is mounted on the gearbox, the gearbox is connected to the transfer case, the shift rocker arm is mounted on the transfer case, the first electric push rod is connected to the shift rocker arm, the transfer case is connected to the reduction gearbox via the intermediate drive shaft, the reduction gearbox is connected to the rear drive axle, the shift lever is mounted on the reduction gearbox, the second electric push rod is connected to the shift lever, and the gear position sensor, the first electric push rod, and the second electric push rod are all connected to the four-wheel drive controller.

5. A four-wheel drive control system for harvesting machinery according to claim 4, characterized in that, The transfer case is equipped with a first separation sensor and a first engagement sensor, and the deceleration release case is equipped with a second separation sensor and a second engagement sensor. The first separation sensor, the first engagement sensor, the second separation sensor, and the second engagement sensor are all connected to the four-wheel drive controller.

6. A four-wheel drive control system for harvesting machinery according to claim 4, characterized in that, The four-wheel drive controller is connected to a display screen.

7. A four-wheel drive control system for harvesting machinery according to claim 4, characterized in that, The four-wheel drive controller is connected to a four-wheel drive switch.

8. A four-wheel drive control system for harvesting machinery according to claim 4, characterized in that, One end of the first electric push rod is connected to the shift rocker arm, and the other end of the first electric push rod is connected to the transfer case. One end of the second electric push rod is connected to the shift handle, and the other end of the second electric push rod is connected to the rear drive axle.

Images