Harvesting machinery hydraulic four-wheel drive control valve group distribution control system and method

Abstract

The present invention relates to the technical field of harvesting machinery, and in particular to a distribution control system and method for a hydraulic four-wheel drive control valve group of a harvesting machinery. The present invention comprises: a variable piston pump, including an electric proportional pump and a gear pump connected to an oil tank; a four-wheel drive anti-skid hydraulic valve group, including a proportional solenoid valve A, a proportional solenoid valve B, a solenoid valve C and a solenoid valve D; a drive axle assembly, including a front drive axle assembly and a rear drive axle assembly; a controller, which monitors the speed ratio i of the speed n1 and the speed n2 in real time, and adjusts the current of the four-wheel drive anti-skid hydraulic valve group according to the degree of slippage, so as to realize the distribution control of the hydraulic power source. By detecting the speed of the front and rear wheels in real time and automatically adjusting the current of the proportional solenoid valve, the hydraulic flow is accurately controlled, the anti-skid control of the front and rear wheels is realized, the driving stability of the harvesting machinery under complex terrain or harsh working conditions is improved, and the mechanical damage and operation interruption caused by slippage are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of harvesting machinery, and in particular to a distribution control system and method for a hydraulic four-wheel drive control valve group of a harvesting machinery. Background Art

[0002] In the field of agricultural production, harvesting machinery is the core equipment for improving crop harvesting efficiency and operation quality, and its performance stability is crucial. However, facing complex and changeable terrain conditions, such as slippery fields and muddy roads, traditional harvesting machinery often encounters the challenge of slipping, which not only reduces the operation efficiency, but also may cause mechanical failure, resulting in operation interruption and increased maintenance costs. In order to overcome this technical bottleneck, industry experts continue to explore and innovate. For example, the electro-hydraulic control four-wheel drive method of harvesting machinery disclosed in Chinese patent CN117967777A is an important progress. This method significantly improves the convenience of switching four-wheel drive mode, effectively reduces the risk of switching failure, and brings users a smoother operation experience. However, even so, the solution is still insufficient in accurately controlling the hydraulic flow to quickly respond to slippage, and the anti-skid effect fails to achieve the ideal state, which in turn increases the possibility of mechanical damage and operation interruption. In addition, the existing solution also faces the lack of intelligent power distribution strategy, that is, it is impossible to dynamically adjust the power output according to the real-time operating environment (including climbing, flat ground and other working conditions), which limits the performance and efficiency of the machine in different working environments. At the same time, the high demand for manual intervention in anti-skid and power distribution not only increases the complexity of operation, but also limits the system's ability to respond immediately to emergencies. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a distribution control system and method for a hydraulic four-wheel drive control valve group of a harvesting machinery.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A distribution control system for a hydraulic four-wheel drive control valve group of a harvesting machine, comprising:

[0006] A variable displacement piston pump, including an electric proportional pump and a gear pump connected to a fuel tank, is used to provide an adjustable hydraulic power source for a four-wheel drive anti-skid hydraulic valve group;

[0007] The four-wheel drive anti-skid hydraulic valve group includes a proportional solenoid valve A, a proportional solenoid valve B, a solenoid valve C and a solenoid valve D, wherein:

[0008] Proportional solenoid valve A automatically adjusts the current according to the front wheel slip rate to control the hydraulic flow of the front wheel and achieve anti-skid control;

[0009] Proportional solenoid valve B automatically adjusts the current according to the rear wheel slip rate to control the hydraulic flow of the rear wheel and achieve anti-skid control;

[0010] Solenoid valve C and solenoid valve D realize the switching of front-wheel drive, rear-wheel drive and four-wheel drive states by controlling electrical signals;

[0011] The drive axle assembly includes a front drive axle assembly and a rear drive axle assembly, wherein:

[0012] A front drive axle assembly, using three or four gears, including a sensor for detecting the front wheel speed n1;

[0013] The rear drive axle assembly adopts a single gear position and includes a sensor for detecting the rear wheel speed n2;

[0014] The controller monitors the speed ratio i between the speed n1 and the speed n2 in real time, and adjusts the current of the four-wheel drive anti-skid hydraulic valve group according to the degree of slippage to realize the distribution control of the hydraulic power source.

[0015] This technical solution integrates a variable piston pump, a four-wheel drive anti-skid hydraulic valve group, a drive axle assembly and a controller, and realizes efficient anti-skid control and power distribution by automatically adjusting the hydraulic flow of the front and rear wheels and switching the drive mode. Specifically, the proportional pump can adjust its output flow according to the signal sent by the controller to achieve precise hydraulic power regulation; the gear pump serves as an auxiliary power source to provide a stable hydraulic flow. The combination of the two can not only meet the system's demand for precise flow control, but also ensure the stability of the hydraulic system; the proportional solenoid valve A and the proportional solenoid valve B, by receiving real-time feedback on the slip rate of the front and rear wheels, automatically adjust their internal current, thereby changing the opening of the valve port, and accurately controlling the hydraulic flow entering the front and rear drive axles, which can quickly respond to wheel slippage, effectively prevent wheel idling, and improve traction and driving stability; the solenoid valve C and the solenoid valve D, by receiving control The controller can quickly switch between front-wheel drive, rear-wheel drive and four-wheel drive modes by receiving the signal from the controller, and can flexibly adjust the power distribution according to the working conditions or driving requirements; the front drive axle adopts multiple gears to increase the adaptability of the machine under different working conditions, such as climbing and leveling operations; the rear drive axle adopts a single gear to simplify the structure and improve reliability; the sensor is used to detect the speed of the front and rear wheels in real time; the controller calculates the speed ratio i by monitoring the speeds n1 and n2 of the front and rear wheels in real time. The change in the speed ratio reflects the traction difference and slippage between the wheels; the controller adjusts the current of the four-wheel drive anti-skid hydraulic valve group according to the preset fixed value and the degree of slippage to achieve precise distribution of hydraulic power.

[0016] In addition, the above-mentioned distribution control system of the hydraulic four-wheel drive control valve group of the harvesting machinery according to the present invention also has the following additional technical features:

[0017] According to one embodiment of the present invention, in the variable piston pump, the electric proportional pump and the gear pump are respectively connected to the oil tank through oil pipes, and are respectively responsible for supplying hydraulic power sources with different flow rates; the electric proportional pump provides hydraulic oil at a constant flow rate of 150L / min, and the gear pump serves as an auxiliary pump, sucking hydraulic oil from the oil tank for pressurized output of 250L / min of hydraulic oil.

[0018] This technical solution ensures that the system can stably and flexibly provide hydraulic power sources with different needs by clarifying the specific connection method and flow distribution of the electric proportional pump and gear pump in the variable piston pump. The electric proportional pump provides a constant flow, and the gear pump provides a higher flow of hydraulic oil as an auxiliary to support the operation requirements of the four-wheel drive anti-skid valve group.

[0019] According to one embodiment of the present invention, the flow rate of the four-wheel drive anti-skid hydraulic valve group is 250L / min, which includes a valve body and a valve core. The valve body material is QT450-10, and the opening and oil flow area of ​​the valve core are electrically proportionally controlled; the four-wheel drive anti-skid hydraulic valve group is equipped with an emergency control screw.

[0020] This technical solution elaborates on the flow specifications, material selection, control method and safety of the four-wheel drive anti-skid hydraulic valve group to ensure that the valve group can operate stably under high flow, and achieve precise flow regulation through electric proportional control. At the same time, it is equipped with emergency control screws to deal with emergencies and improve the reliability of the system.

[0021] According to one embodiment of the present invention, the proportional solenoid valve A and the proportional solenoid valve B constitute an electric proportional four-wheel drive valve group, including:

[0022] Port T1 and port P1 are used as the oil return port and oil supply port between the oil tank and the electric proportional four-wheel drive valve group respectively;

[0023] Port T2 and port P2 are used as the oil return port and oil supply port between the electric proportional four-wheel drive valve group and the rear axle clutch respectively;

[0024] Ports C1, C2, C3 and C4 are connected to detection control elements respectively to detect or adjust the working state of proportional solenoid valve A;

[0025] Ports C5 and C6 are connected to detection control components respectively, which are used to detect or adjust the working state of proportional solenoid valve B;

[0026] A1 port, connected to the electric proportional pump, receives hydraulic oil with adjustable pressure;

[0027] A2 port is connected to quantitative motor I, and the flow of hydraulic oil to quantitative motor I is adjusted according to the control signal to control the speed of the front wheel;

[0028] A3 port is connected to the quantitative motor II, and the hydraulic oil flow to the quantitative motor II is adjusted according to the control signal to control the rear wheel speed.

[0029] This technical solution achieves precise control of the hydraulic flow of the front and rear wheels by constructing an electric proportional four-wheel drive valve group composed of proportional solenoid valves A and B, and defines the function and connection method of each interface in detail. At the same time, by connecting detection control elements, the working status of the solenoid valve is monitored and adjusted in real time to ensure that the system can accurately respond to wheel slippage and achieve anti-skid control.

[0030] According to one embodiment of the present invention, the solenoid valve C and the solenoid valve D constitute a rear axle clutch, including:

[0031] Port T4 and port P4 are used as the oil return port and oil supply port between solenoid valve C and solenoid valve D respectively;

[0032] D2 port is connected to the rear drive axle assembly, and controls the on and off of the hydraulic oil through the solenoid valve C to achieve the switching of the front drive state;

[0033] Port D3 is connected to the rear drive axle assembly and controls the on and off of the hydraulic oil through the solenoid valve D to achieve switching between rear-wheel drive and four-wheel drive status.

[0034] This technical solution uses a rear axle clutch composed of solenoid valves C and D to clarify the functions of each interface and the connection method with the rear drive axle assembly, thereby achieving rapid switching between front-wheel drive, rear-wheel drive and four-wheel drive states, and improving the adaptability and flexibility of the machine under different operating conditions.

[0035] In order to achieve the above-mentioned purpose, the present invention also provides a distribution control method for a hydraulic four-wheel drive control valve group of a harvesting machinery.

[0036] A distribution control method for a hydraulic four-wheel drive control valve group of a harvesting machine comprises the following steps:

[0037] S1. Establishment of control system:

[0038] S11, setting a preset range of the speed ratio i of the front wheels and the rear wheels during normal driving;

[0039] S12, configuring sensors to detect the rotation speeds n1 and n2 of the front and rear wheels in real time;

[0040] S13, proportional solenoid valve A and proportional solenoid valve B are connected to the controller respectively, ready to receive control signals;

[0041] S2. Normal driving control:

[0042] S21, during normal driving of the vehicle, continuously monitoring the rotation speeds n1 and n2 of the front and rear wheels;

[0043] S22, calculating the current speed ratio i'= n1 / n2;

[0044] S23, judging whether i' is within a preset range:

[0045] If yes, continue driving normally without adjustment;

[0046] If not, proceed to step S3 or step S4;

[0047] S3, front wheel slip distribution control:

[0048] S31, when it is detected that i'>i, it is determined that the front wheel is slipping;

[0049] S32, calculating the slip degree i' / i, and determining the amplitude of the front wheel flow rate that needs to be adjusted according to the ratio;

[0050] S33, the controller sends a corresponding current signal to the proportional solenoid valve A to adjust the size of the throttle valve hole and perform pressure compensation;

[0051] S34, real-time monitoring of the front wheel speed n1 and the rear wheel speed n2, and adjusting until i' returns to a preset range;

[0052] S35, i' is restored to the preset fixed value, the slipping state is released, and the controller sends a signal to the proportional solenoid valve A to cut off the power and restore the normal four-wheel drive control;

[0053] S4, rear wheel slip distribution control:

[0054] S41, when it is detected that i'<i, it is determined that the rear wheel is slipping;

[0055] S42, calculating the slippage degree i / i', and determining the magnitude of the rear wheel flow rate that needs to be adjusted according to the ratio;

[0056] S43, the controller sends a corresponding current signal to the proportional solenoid valve B to adjust the size of the throttle valve hole and perform pressure compensation;

[0057] S44, monitor the front wheel speed n1 and the rear wheel speed n2 in real time, and adjust until i' returns to the preset range;

[0058] S45, i' is restored to the preset fixed value, the slipping state is released, and the controller sends a signal to the proportional solenoid valve B to cut off the power and restore normal four-wheel drive control.

[0059] This technical solution realizes intelligent distribution control of the hydraulic four-wheel drive control valve group of the harvesting machinery. Specifically, firstly, by setting the preset range of the front and rear wheel speed ratio during normal driving, and configuring sensors to detect the speed of the front and rear wheels in real time; during normal driving, the speed ratio is continuously monitored and compared with the preset range to determine whether the vehicle is in a slipping state; once the front or rear wheel is found to be slipping (that is, the speed ratio deviates from the preset range), the corresponding slip distribution control process will be automatically entered; for the front wheel slipping, the hydraulic flow of the front wheel is accurately controlled by calculating the slip degree and adjusting the current signal of the proportional solenoid valve A to achieve anti-skid control; similarly, for the rear wheel slipping, the hydraulic flow of the rear wheel is controlled by adjusting the current signal of the proportional solenoid valve B; during the entire control process, the speed of the front and rear wheels is monitored in real time, and the control parameters are dynamically adjusted according to the feedback results until the speed ratio returns to the preset range, thereby effectively releasing the slipping state and restoring normal four-wheel drive control, which not only improves the stability of the machinery, but also significantly improves the working efficiency.

[0060] According to one embodiment of the present invention, the method further includes:

[0061] S5. Distribution control of front drive state:

[0062] S51, solenoid valve C is powered first;

[0063] S52, after the W2 position switch of the rear drive axle assembly is energized, the solenoid valve C is de-energized;

[0064] S53, the rear drive axle assembly switches to front drive state.

[0065] The solenoid valve C of the present technical solution is energized, and then the solenoid valve C is de-energized when the W2 position switch of the rear drive axle assembly is energized, thereby achieving precise control of the rear drive axle assembly from preparation for the front drive state to the actual switching to the front drive state, ensuring a smooth transition of the machine between different drive modes.

[0066] According to one embodiment of the present invention, the method further includes:

[0067] S6, rear-wheel drive and four-wheel drive status distribution control:

[0068] S61, solenoid valve D is powered first;

[0069] S62, after the W1 position switch of the rear drive axle assembly is energized, the solenoid valve D is de-energized;

[0070] S63. Determine whether the front axle gearbox is in neutral:

[0071] If yes, the rear drive axle assembly switches to rear drive state;

[0072] If not, the rear drive axle assembly switches to four-wheel drive state.

[0073] The technical solution enables the solenoid valve D to be energized, and then the solenoid valve D is de-energized according to the energized state of the W1 position switch of the rear drive axle assembly, and further determines whether the front axle gearbox is in neutral; the rear drive axle assembly is switched to the rear-wheel drive state or the four-wheel drive state to meet the power requirements under different operating conditions and improve the adaptability of the machine.

[0074] Compared with the prior art, the present invention has the following beneficial effects:

[0075] (1) By real-time detection of the front and rear wheel speeds and automatic adjustment of the current of the proportional solenoid valve, the hydraulic flow is precisely controlled to achieve anti-skid control of the front and rear wheels, thereby improving the driving stability of the harvesting machinery in complex terrain or harsh working conditions and reducing mechanical damage and operation interruption caused by skidding;

[0076] (2) By switching between front-wheel drive, rear-wheel drive and four-wheel drive modes, the power can be optimally distributed according to the working conditions and driving requirements through precise control of solenoid valves C and D, which not only improves the working efficiency of the machine, but also enhances its ability to adapt to different working environments, such as climbing slopes and working on flat ground;

[0077] (3) Advanced components such as integrated controllers, sensors and proportional solenoid valves are used to realize intelligent distribution control of the hydraulic four-wheel drive control valve group; through real-time monitoring and dynamic adjustment, it can automatically respond to slippage and quickly restore normal driving conditions, reducing human intervention and improving the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Figure 1 It is the electrical connection diagram of the whole system of the present invention.

[0079] Figure 2 This is the electrical connection diagram of the variable displacement piston pump.

[0080] Figure 3 This is the electrical connection diagram of the four-wheel drive anti-skid hydraulic valve group.

[0081] Figure 4 This is the electrical connection diagram of the rear drive axle assembly.

[0082] Figure 5 This is the electrical connection diagram of the front drive axle assembly.

[0083] In the figure: 1. Fuel tank; 2. Variable piston pump; 21. Electric proportional pump; 22. Gear pump; 3. Electric proportional four-wheel drive valve group; 31. Proportional solenoid valve A; 32. Proportional solenoid valve B; 4. Rear axle clutch; 41. Solenoid valve C; 42. Solenoid valve D; 5. Fixed displacement motor I; 6. Rear drive axle assembly; 7. Fixed displacement motor II; 8. Front drive axle assembly. DETAILED DESCRIPTION

[0084] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0085] Example 1

[0086] like Figure 1 As shown, this embodiment provides a distribution control system for a hydraulic four-wheel drive control valve group of a harvesting machine, comprising:

[0087] like Figure 2 As shown, the variable piston pump 2 includes an electric proportional pump 21 and a gear pump 22 connected to the oil tank 1, and is used to provide an adjustable hydraulic power source for the four-wheel drive anti-skid hydraulic valve group;

[0088] like Figure 3 As shown, the four-wheel drive anti-skid hydraulic valve group includes a proportional solenoid valve A31, a proportional solenoid valve B32, a solenoid valve C41 and a solenoid valve D42, wherein:

[0089] Proportional solenoid valve A31 automatically adjusts the current according to the front wheel slip rate to control the hydraulic flow of the front wheel and achieve anti-skid control;

[0090] Proportional solenoid valve B32 automatically adjusts the current according to the rear wheel slip rate to control the hydraulic flow of the rear wheel and achieve anti-skid control;

[0091] Solenoid valve C41 and solenoid valve D42 realize the switching of front-wheel drive, rear-wheel drive and four-wheel drive states by controlling electrical signals;

[0092] Drive axle assembly, such as Figure 4 and Figure 5 As shown, it includes a front drive axle assembly 8 and a rear drive axle assembly 6, wherein:

[0093] The front drive axle assembly 8 adopts three or four gears and includes a sensor for detecting the front wheel speed n1;

[0094] The rear drive axle assembly 6 adopts a single gear position and includes a sensor for detecting the rear wheel speed n2;

[0095] The controller monitors the speed ratio i between the speed n1 and the speed n2 in real time, and adjusts the current of the four-wheel drive anti-skid hydraulic valve group according to the degree of slippage to realize the distribution control of the hydraulic power source.

[0096] like Figures 1 to 5As shown, this technical solution integrates a variable piston pump 2, a four-wheel drive anti-skid hydraulic valve group, a drive axle assembly and a controller, and realizes efficient anti-skid control and power distribution by automatically adjusting the hydraulic flow of the front and rear wheels and switching the drive mode. Specifically, the proportional pump can adjust its output flow according to the signal sent by the controller to achieve precise hydraulic power regulation; the gear pump 22 serves as an auxiliary power source to provide a stable hydraulic flow. The combination of the two can not only meet the system's demand for precise flow control, but also ensure the stability of the hydraulic system; the proportional solenoid valve A31 and the proportional solenoid valve B32, by receiving real-time feedback on the slip rate of the front and rear wheels, automatically adjust their internal currents, thereby changing the opening of the valve port, and accurately controlling the hydraulic flow entering the front and rear drive axles, which can quickly respond to wheel slippage, effectively prevent wheel idling, and improve traction and driving stability; the solenoid valve C41 and the solenoid valve D42, through By receiving signals from the controller, it can quickly switch between front-wheel drive, rear-wheel drive and four-wheel drive modes, and can flexibly adjust power distribution according to operating conditions or driving needs; the front drive axle adopts multiple gears to increase the adaptability of the machine under different working conditions, such as climbing, flat ground operations, etc.; the rear drive axle adopts a single gear to simplify the structure and improve reliability; the sensor is used to detect the speed of the front and rear wheels in real time; the controller calculates the speed ratio i by monitoring the speeds n1 and n2 of the front and rear wheels in real time. The change in the speed ratio reflects the traction difference and slippage between the wheels; the controller adjusts the current of the four-wheel drive anti-skid hydraulic valve group according to the preset fixed value and the degree of slippage to achieve precise distribution of hydraulic power.

[0097] In addition, the above-mentioned distribution control system of the hydraulic four-wheel drive control valve group of the harvesting machinery according to the present invention also has the following additional technical features:

[0098] According to one embodiment of the present invention, in the variable piston pump 2, the electric proportional pump 21 and the gear pump 22 are respectively connected to the oil tank 1 through oil pipes, and are respectively responsible for supplying hydraulic power sources with different flow rates; the electric proportional pump 21 provides hydraulic oil at a constant flow rate of 150L / min, and the gear pump 22 acts as an auxiliary pump, sucking hydraulic oil from the oil tank 1 for pressurized output of 250L / min hydraulic oil.

[0099] This technical solution ensures that the system can stably and flexibly provide hydraulic power sources with different needs by clarifying the specific connection method and flow distribution of the electric proportional pump 21 and the gear pump 22 in the variable piston pump 2. The electric proportional pump 21 provides a constant flow, and the gear pump 22 provides a higher flow of hydraulic oil as an auxiliary to support the operation requirements of the four-wheel drive anti-skid valve group.

[0100] According to one embodiment of the present invention, the flow rate of the four-wheel drive anti-skid hydraulic valve group is 250L / min, which includes a valve body and a valve core. The valve body material is QT450-10, and the opening and oil flow area of ​​the valve core are electrically proportionally controlled; the four-wheel drive anti-skid hydraulic valve group is equipped with an emergency control screw.

[0101] This technical solution elaborates on the flow specifications, material selection, control method and safety of the four-wheel drive anti-skid hydraulic valve group to ensure that the valve group can operate stably under high flow, and achieve precise flow regulation through electric proportional control. At the same time, it is equipped with emergency control screws to deal with emergencies and improve the reliability of the system.

[0102] According to one embodiment of the present invention, the proportional solenoid valve A31 and the proportional solenoid valve B32 constitute an electric proportional four-wheel drive valve group 3, including:

[0103] Port T1 and port P1 are used as the oil return port and oil supply port between the oil tank 1 and the electric proportional four-wheel drive valve group 3 respectively;

[0104] Port T2 and port P2 are used as the oil return port and oil supply port between the electric proportional four-wheel drive valve group 3 and the rear axle clutch 4, respectively;

[0105] Ports C1, C2, C3 and C4 are connected to detection control elements respectively, which are used to detect or adjust the working state of proportional solenoid valve A31;

[0106] Ports C5 and C6 are connected to detection control components respectively, which are used to detect or adjust the working state of proportional solenoid valve B32;

[0107] A1 port is connected to the electric proportional pump 21 to receive hydraulic oil with adjustable pressure;

[0108] A2 port is connected to the quantitative motor Ⅰ5, and the flow of hydraulic oil to the quantitative motor Ⅰ5 is adjusted according to the control signal to control the speed of the front wheel;

[0109] A3 port is connected to the quantitative motor Ⅱ7, and the flow of hydraulic oil to the quantitative motor Ⅱ7 is adjusted according to the control signal to control the speed of the rear wheel.

[0110] This technical solution realizes precise control of the hydraulic flow of the front and rear wheels by constructing an electric proportional four-wheel drive valve group 3 composed of proportional solenoid valves A31 and B, and defines the function and connection method of each interface in detail. At the same time, by connecting detection control elements, the working state of the solenoid valve is monitored and adjusted in real time to ensure that the system can accurately respond to wheel slippage and achieve anti-skid control.

[0111] According to one embodiment of the present invention, the solenoid valve C41 and the solenoid valve D42 constitute a rear axle clutch 4, including:

[0112] Port T4 and port P4 are used as the oil return port and oil supply port between solenoid valve C41 and solenoid valve D42 respectively;

[0113] D2 port is connected to the rear drive axle assembly 6, and controls the on and off of the hydraulic oil through the solenoid valve C41 to achieve the switching of the front drive state;

[0114] The D3 port is connected to the rear drive axle assembly 6, and the on and off of the hydraulic oil is controlled by the solenoid valve D42 to achieve the switching between the rear drive and four-wheel drive states.

[0115] This technical solution uses the rear axle clutch 4 composed of the solenoid valve C41 and the solenoid valve D42 to clarify the functions of each interface and the connection method with the rear drive axle assembly 6, thereby realizing rapid switching between front-wheel drive, rear-wheel drive and four-wheel drive states, and improving the adaptability and flexibility of the machine under different operating conditions.

[0116] Example 2

[0117] Based on Example 1, Figures 1 to 5 As shown, this embodiment provides a distribution control method for a hydraulic four-wheel drive control valve group of a harvesting machine, comprising the following steps:

[0118] S1. Establishment of control system:

[0119] S11, setting a preset range of the speed ratio i of the front wheels and the rear wheels during normal driving;

[0120] S12, configuring sensors to detect the rotation speeds n1 and n2 of the front and rear wheels in real time;

[0121] S13, proportional solenoid valve A31 and proportional solenoid valve B32 are connected to the controller respectively, ready to receive control signals;

[0122] S2. Normal driving control:

[0123] S21, during normal driving of the vehicle, continuously monitoring the rotation speeds n1 and n2 of the front and rear wheels;

[0124] S22, calculating the current speed ratio i'= n1 / n2;

[0125] S23, judging whether i' is within a preset range:

[0126] If yes, continue driving normally without adjustment;

[0127] If not, proceed to step S3 or step S4;

[0128] S3, front wheel slip distribution control:

[0129] S31, when it is detected that i'>i, it is determined that the front wheel is slipping;

[0130] S32, calculating the slip degree i' / i, and determining the amplitude of the front wheel flow rate that needs to be adjusted according to the ratio;

[0131] S33, the controller sends a corresponding current signal to the proportional solenoid valve A31 to adjust the size of the throttle valve hole and perform pressure compensation;

[0132] S34, real-time monitoring of the front wheel speed n1 and the rear wheel speed n2, and adjusting until i' returns to a preset range;

[0133] S35, i' is restored to the preset fixed value, the slip state is released, and the controller sends a signal to the proportional solenoid valve A31 to cut off the power and restore normal four-wheel drive control;

[0134] S4, rear wheel slip distribution control:

[0135] S41, when it is detected that i'<i, it is determined that the rear wheel is slipping;

[0136] S42, calculating the slippage degree i / i', and determining the magnitude of the rear wheel flow rate that needs to be adjusted according to the ratio;

[0137] S43, the controller sends a corresponding current signal to the proportional solenoid valve B32 to adjust the size of the throttle valve hole and perform pressure compensation;

[0138] S44, monitor the front wheel speed n1 and the rear wheel speed n2 in real time, and adjust until i' returns to the preset range;

[0139] S45, i' is restored to the preset fixed value, the slipping state is released, and the controller sends a signal to the proportional solenoid valve B32 to cut off the power and restore normal four-wheel drive control.

[0140] This technical solution realizes intelligent distribution control of the hydraulic four-wheel drive control valve group of the harvesting machinery. Specifically, firstly, by setting the preset range of the front and rear wheel speed ratio during normal driving, and configuring sensors to detect the speed of the front and rear wheels in real time; during normal driving, the speed ratio is continuously monitored and compared with the preset range to determine whether the vehicle is in a slipping state; once the front or rear wheel is found to be slipping (that is, the speed ratio deviates from the preset range), the corresponding slip distribution control process will be automatically entered; for the front wheel slipping, the hydraulic flow of the front wheel is accurately controlled by calculating the slip degree and adjusting the current signal of the proportional solenoid valve A31 to achieve anti-skid control; similarly, for the rear wheel slipping, the hydraulic flow of the rear wheel is controlled by adjusting the current signal of the proportional solenoid valve B32; during the entire control process, the speed of the front and rear wheels is monitored in real time, and the control parameters are dynamically adjusted according to the feedback results until the speed ratio returns to the preset range, thereby effectively releasing the slipping state and restoring normal four-wheel drive control, which not only improves the stability of the machinery, but also significantly improves the working efficiency.

[0141] According to one embodiment of the present invention, the method further includes:

[0142] S5. Distribution control of front drive state:

[0143] S51 and solenoid valve C41 are energized first;

[0144] S52, after the W2 position switch of the rear drive axle assembly 6 is energized, the solenoid valve C41 is de-energized;

[0145] S53, the rear drive axle assembly 6 switches to the front drive state.

[0146] The solenoid valve C41 of the present technical solution is energized, and then the solenoid valve C41 is de-energized when the W2 position switch of the rear drive axle assembly 6 is energized, thereby achieving precise control of the rear drive axle assembly 6 from the preparation of the front drive state to the actual switching to the front drive state, ensuring a smooth transition of the machine between different drive modes.

[0147] According to one embodiment of the present invention, the method further includes:

[0148] S6, rear-wheel drive and four-wheel drive status distribution control:

[0149] S61 and solenoid valve D42 are powered first;

[0150] After S62 and the W1 position switch of the rear drive axle assembly 6 are energized, the solenoid valve D42 is de-energized;

[0151] S63. Determine whether the front axle gearbox is in neutral:

[0152] If yes, the rear drive axle assembly 6 switches to the rear drive state;

[0153] If not, the rear drive axle assembly 6 switches to the four-wheel drive state.

[0154] This technical solution enables the solenoid valve D42 to be energized, and then the solenoid valve D42 is de-energized according to the energized state of the W1 position switch of the rear drive axle assembly 6, and further determines whether the front axle gearbox is in neutral; the rear drive axle assembly 6 is switched to the rear-wheel drive state or the four-wheel drive state to meet the power requirements under different operating conditions and improve the adaptability of the machine.

[0155] Although the present invention is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A distribution control system for a hydraulic four-wheel drive control valve group of a harvesting machine, characterized in that: include: A variable displacement piston pump (2), comprising an electric proportional pump (21) and a gear pump (22) connected to the oil tank (1), for providing an adjustable hydraulic power source for the four-wheel drive anti-skid hydraulic valve group; The four-wheel drive anti-skid hydraulic valve group includes a proportional solenoid valve A (31), a proportional solenoid valve B (32), a solenoid valve C (41) and a solenoid valve D (42), wherein: A proportional solenoid valve A (31) automatically adjusts the current according to the front wheel slip rate to control the hydraulic flow of the front wheel to achieve anti-skid control; A proportional solenoid valve B (32) automatically adjusts the current according to the rear wheel slip rate to control the hydraulic flow of the rear wheel to achieve anti-skid control; The solenoid valve C (41) and the solenoid valve D (42) realize the switching of the front drive, rear drive and four-wheel drive states by controlling the electrical signal; The drive axle assembly comprises a front drive axle assembly (8) and a rear drive axle assembly (6), wherein: A front drive axle assembly (8), using three or four gears, includes a sensor for detecting the front wheel speed n1; The rear drive axle assembly (6) adopts a single gear position and includes a sensor for detecting the rear wheel speed n2; The controller monitors the speed ratio i between the speed n1 and the speed n2 in real time, and adjusts the current of the four-wheel drive anti-skid hydraulic valve group according to the degree of slippage to achieve distribution control of the hydraulic power source; In the variable piston pump (2), the electric proportional pump (21) and the gear pump (22) are respectively connected to the oil tank (1) through oil pipes, and are respectively responsible for supplying hydraulic power sources with different flow rates; the electric proportional pump (21) provides hydraulic oil with a constant flow rate of 150 L / min, and the gear pump (22) serves as an auxiliary pump, sucking hydraulic oil from the oil tank (1) to pressurize and output hydraulic oil at 250 L / min; The flow rate of the four-wheel drive anti-skid hydraulic valve group is 250L / min, which includes a valve body and a valve core. The valve body material is QT450-10, and the opening and oil flow area of ​​the valve core are controlled by electric proportion; the four-wheel drive anti-skid hydraulic valve group is equipped with an emergency control screw; The proportional solenoid valve A (31) and the proportional solenoid valve B (32) constitute an electric proportional four-wheel drive valve group (3), comprising: Port T1 and port P1 are used as the oil return port and oil supply port between the oil tank (1) and the electric proportional four-wheel drive valve group (3), respectively; Port T2 and port P2 are used as the oil return port and oil supply port between the electric proportional four-wheel drive valve group (3) and the rear axle clutch (4), respectively; Ports C1, C2, C3 and C4 are connected to detection control elements respectively for detecting or adjusting the working state of proportional solenoid valve A (31); Ports C5 and C6 are connected to detection control elements respectively for detecting or adjusting the working state of proportional solenoid valve B (32); A1 port is connected to an electric proportional pump (21) to receive hydraulic oil with adjustable pressure; A2 port is connected to the quantitative motor Ⅰ (5), and adjusts the flow of hydraulic oil to the quantitative motor Ⅰ (5) according to the control signal to control the speed of the front wheel; A3 port is connected to the quantitative motor II (7), and adjusts the flow of hydraulic oil to the quantitative motor II (7) according to the control signal to control the speed of the rear wheel; The solenoid valve C (41) and the solenoid valve D (42) constitute a rear axle clutch (4), comprising: Port T4 and port P4 are used as the oil return port and oil supply port between solenoid valve C (41) and solenoid valve D (42), respectively; D2 port is connected to the rear drive axle assembly (6) and controls the on and off of the hydraulic oil through the solenoid valve C (41) to achieve the switching of the front drive state; The D3 port is connected to the rear drive axle assembly (6) and controls the on and off of the hydraulic oil through the solenoid valve D (42) to achieve the switching between the rear drive and four-wheel drive states.

2. A method for controlling the distribution of a hydraulic four-wheel drive control valve group of a harvesting machine, using the distribution control system of the hydraulic four-wheel drive control valve group of a harvesting machine as claimed in claim 1, characterized in that: The steps include: S1. Establishment of control system: S11, setting a preset range of the speed ratio i of the front wheels and the rear wheels during normal driving; S12, configuring sensors to detect the rotation speeds n1 and n2 of the front and rear wheels in real time; S13, proportional solenoid valve A (31) and proportional solenoid valve B (32) are respectively connected to the controller, ready to receive control signals; S2. Normal driving control: S21, during normal driving of the vehicle, continuously monitoring the rotation speeds n1 and n2 of the front and rear wheels; S22, calculating the current speed ratio i'= n1 / n2; S23, judging whether i' is within a preset range: If yes, continue driving normally without adjustment; If not, proceed to step S3 or step S4; S3, front wheel slip distribution control: S31, when it is detected that i'>i, it is determined that the front wheel is slipping; S32, calculating the slip degree i' / i, and determining the amplitude of the front wheel flow rate that needs to be adjusted according to the ratio; S33, the controller sends a corresponding current signal to the proportional solenoid valve A (31), adjusts the size of the throttle valve hole, and performs pressure compensation; S34, real-time monitoring of the front wheel speed n1 and the rear wheel speed n2, and adjusting until i' returns to a preset range; S35, i' is restored to a preset fixed value, the slip state is released, and the controller sends a signal to the proportional solenoid valve A (31) to cut off the power and restore normal four-wheel drive control; S4, rear wheel slip distribution control: S41, when it is detected that i'<i, it is determined that the rear wheel is slipping; S42, calculating the slippage degree i / i', and determining the magnitude of the rear wheel flow rate that needs to be adjusted according to the ratio; S43, the controller sends a corresponding current signal to the proportional solenoid valve B (32), adjusts the size of the throttle valve hole, and performs pressure compensation; S44, monitor the front wheel speed n1 and the rear wheel speed n2 in real time, and adjust until i' returns to the preset range; S45, i' is restored to the preset fixed value, the slip state is released, and the controller sends a signal to the proportional solenoid valve B (32) to cut off the power and restore normal four-wheel drive control.

3. The method for controlling the distribution of the hydraulic four-wheel drive control valve group of a harvesting machine according to claim 2, characterized in that: The method further comprises: S5. Distribution control of front drive state: S51, solenoid valve C (41) is energized first; S52, after the W2 position switch of the rear drive axle assembly (6) is energized, the solenoid valve C (41) is de-energized; S53, the rear drive axle assembly (6) is switched to the front drive state.

4. The method for controlling the distribution of the hydraulic four-wheel drive control valve group of a harvesting machine according to claim 2, characterized in that: The method further comprises: S6, rear-wheel drive and four-wheel drive status distribution control: S61, solenoid valve D (42) are energized first; S62, after the W1 position switch of the rear drive axle assembly (6) is energized, the solenoid valve D (42) is de-energized; S63. Determine whether the front axle gearbox is in neutral: If yes, the rear drive axle assembly (6) switches to the rear drive state; If not, the rear drive axle assembly (6) switches to four-wheel drive state.

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