Brake valve block assembly, brake control method, brake system and agricultural machine

Abstract

The invention belongs to the technical field of agricultural machinery, and discloses a brake valve block assembly, a brake control method, a brake system and the agricultural machinery, when the agricultural machinery needs to be braked, a first reversing valve of the brake valve block assembly can control a first piston to move so as to switch the working state of a clutch, and the brake valve block assembly can control the first piston to move. Meanwhile, connection between the hydraulic oil source and the multi-way valve assembly can be cut off through the first control valve, so that the hydraulic oil source only supplies oil to the braking system, oil supply of the braking system is guaranteed, and after braking is completed, the hydraulic oil source can be switched off through the multi-way valve assembly. When the brake valve block assembly is used for braking, the first control valve is controlled to enable the hydraulic oil source to only supply oil to a brake system, and the problem that the brake force is reduced due to insufficient brake oil pressure is avoided. The input end of the second control valve can be controlled to be connected with the output end of the second control valve, so that the oil flows back to the oil tank, and the brake valve block assembly can control the first control valve to enable the hydraulic oil source to only supply oil to the brake system.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery, and in particular to a brake valve block assembly, a brake control method, a brake system and agricultural machinery. Background Art

[0002] At present, the steering, braking and hydraulic output actuators of most tractors still need to be operated by the driver, and the level of electrification is relatively low.

[0003] In order to realize the unmanned driving of the tractor, it is usually necessary to electrically control the steering, braking and hydraulic output through different structures. Among them, the braking of the unmanned tractor usually needs to control the brake valve block. For example, the prior art provides a brake valve block assembly for a tractor, which connects the rodless chamber of the brake cylinder with a hydraulic oil source through a plurality of electromagnetic reversing valves. The hydraulic oil source is used to supply oil to the rodless chamber, or connect the rodless chamber of the brake cylinder with the oil tank to realize oil return. However, the problem is that when the tractor needs to brake, the hydraulic system should give priority to supplying oil to the brake system compared to the hydraulic output module, but the above scheme cannot give priority to supplying oil to the brake system. In the case of emergency braking, the braking force may decrease due to insufficient brake oil pressure, which leads to poor safety of the tractor. Summary of the invention

[0004] According to one aspect of the present invention, the present invention provides a brake valve block assembly to solve the problem in the prior art that when a tractor needs emergency braking, the braking force may decrease due to insufficient brake oil pressure, thereby causing poor safety of the tractor.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A brake valve block assembly, used to connect a first hydraulic cylinder and a second hydraulic cylinder of a brake system, wherein a first piston of the first hydraulic cylinder is connected to a clutch pedal, and a second piston of the second hydraulic cylinder is connected to a brake pedal;

[0007] The brake valve block assembly comprises:

[0008] A first control valve, the two ends of which are respectively used to connect a hydraulic oil source and a multi-way valve assembly, and are used to connect or disconnect the hydraulic oil source from the multi-way valve assembly;

[0009] A second control valve having a second control valve input end and a second control valve output end, wherein the second control valve output end is used to connect to the oil tank, and the second control valve is used to connect or disconnect the second control valve input end and the second control valve output end;

[0010] a first reversing valve connected to a hydraulic oil source and an input end of the second control valve and used to extend or retract the first piston;

[0011] The second reversing valve is connected to the hydraulic oil source and the input end of the second control valve and is used to extend or retract the second piston.

[0012] As a preferred solution of the brake valve block assembly, the first piston divides the inner cavity of the first hydraulic cylinder into a first rodless cavity and a first rod cavity, the first reversing valve has a first input end, a first output end and a first oil return end, the first input end is connected to the hydraulic oil source, the first output end is connected to the first rodless cavity, the first oil return end is connected to the second control valve input end, and the first reversing valve is used to connect the first output end to the first input end, or to the first oil return end;

[0013] The second piston divides the inner cavity of the second hydraulic cylinder into a second rodless cavity and a second rod cavity. The second reversing valve has a second input end, a second output end, and a second oil return end. The second input end is connected to the hydraulic oil source, the second output end is connected to the second rodless cavity, and the second oil return end is connected to the second control valve input end. The second reversing valve is used to connect the second output end to the second input end, or to the second oil return end.

[0014] As a preferred solution of the brake valve block assembly, it also includes a valve block body, the first control valve, the second control valve, the first reversing valve and the second reversing valve are all arranged on the valve block body, and the valve block body has a hydraulic oil source connection end, a multi-way valve connection end, an oil tank connection end, a first hydraulic cylinder connection end and a second hydraulic cylinder connection end;

[0015] The hydraulic oil source connection end is used to connect to the hydraulic oil source and is connected to the first control valve;

[0016] The multi-way valve connection end is used to connect the multi-way valve assembly and is connected to the first control valve;

[0017] The oil tank connecting end is used to connect the oil tank and is connected to the output end of the second control valve;

[0018] The first hydraulic cylinder connection end is used to connect to the first rodless chamber and is connected to the first output end;

[0019] The second hydraulic cylinder connecting end is used to connect to the second rodless chamber and is connected to the second output end.

[0020] According to another aspect of the present invention, a braking control method is provided, which is implemented by the above-mentioned brake valve block assembly, and the braking control method comprises:

[0021] S100: determining that the agricultural machinery has a braking demand and obtaining a target vehicle speed;

[0022] S110: Control the first control valve to disconnect the hydraulic oil source from the multi-way valve assembly; control the first reversing valve to extend the first piston out of the first hydraulic cylinder, so that the clutch disconnects power;

[0023] S120: Control the second reversing valve to perform braking.

[0024] As a preferred solution of the brake control method, the second piston divides the inner cavity of the second hydraulic cylinder into a second rodless cavity and a second rod cavity, the second reversing valve has a second input end, a second output end, and a second oil return end, the second input end is connected to the hydraulic oil source, the second output end is connected to the second rodless cavity, the second oil return end is connected to the second control valve input end, the second reversing valve is used to connect the second output end to the second input end, or to the second oil return end, and when the second output end is connected to the second input end, the opening of the second reversing valve is adjustable;

[0025] In step S120, the actual speed of the agricultural machinery is obtained, and the target opening of the second reversing valve is determined based on the difference between the actual speed and the target speed, and the opening of the second reversing valve is adjusted according to the target opening;

[0026] The braking control method further includes, after step S120:

[0027] S130: Acquire the actual vehicle speed, and compare the actual vehicle speed with the target vehicle speed;

[0028] If the actual vehicle speed is greater than the target vehicle speed, the process returns to step S120.

[0029] As a preferred solution of the braking control method, if the actual vehicle speed is not greater than the target vehicle speed, step S140 is executed;

[0030] S140: Determine whether the actual vehicle speed is 0, and determine whether parking brake is required;

[0031] If the actual vehicle speed is 0 and parking brake is required, execute step S150;

[0032] S150: Control the first control valve to connect the hydraulic oil source to the multi-way valve assembly; control the second control valve to disconnect the input end of the second control valve from the output end of the second control valve.

[0033] As a preferred solution of the braking control method, if the actual vehicle speed is 0 and parking brake is not required, step S160 is executed;

[0034] S160: Control the first control valve to connect the hydraulic oil source with the multi-way valve assembly; control the second control valve to connect the second control valve input end with the second control valve output end; control the second reversing valve to retract the second piston.

[0035] As a preferred solution of the braking control method, if the actual vehicle speed is not 0, step S170 is executed;

[0036] S170: Release the brake and continue driving.

[0037] According to another aspect of the present invention, a braking system is provided, comprising the above-mentioned brake valve block assembly, and also comprising a first hydraulic cylinder and a second hydraulic cylinder, wherein the first piston of the first hydraulic cylinder is connected to the clutch pedal, and the second piston of the second hydraulic cylinder is connected to the brake pedal.

[0038] According to another aspect of the present invention, there is provided agricultural machinery, comprising the above-mentioned braking system, and also comprising a hydraulic oil source, a multi-way valve assembly and an oil tank, wherein the two ends of the first control valve are respectively connected to the hydraulic oil source and the multi-way valve assembly, and the second control valve output end of the second control valve is connected to the oil tank.

[0039] The beneficial effects of the present invention are:

[0040] The present invention provides a brake valve block assembly, which is used to connect a first hydraulic cylinder and a second hydraulic cylinder of a brake system. The first piston of the first hydraulic cylinder is connected to a clutch pedal, and the second piston of the second hydraulic cylinder is connected to a brake pedal. The clutch pedal can be driven to move by the expansion and contraction of the first piston to switch the working state of the clutch, so that it is connected to power or disconnected. In addition, the brake pedal can be driven to move by the expansion and contraction of the second piston to achieve braking. The brake valve block assembly includes a first control valve, a second control valve, a first reversing valve, and a second reversing valve. The two ends of the first control valve are respectively used to connect a hydraulic oil source and a multi-way valve assembly, and are used to connect or disconnect the hydraulic oil source from the multi-way valve assembly, so as to control whether the hydraulic oil source supplies oil to the multi-way valve assembly. The second control valve has a second control valve input end and a second control valve output end, the second control valve output end is used to connect the oil tank, and the second control valve is used to connect or disconnect the second control valve input end with the second control valve output end; the first reversing valve is connected to the hydraulic oil source and the second control valve input end, and is used to extend or retract the first piston; the second reversing valve is connected to the hydraulic oil source and the second control valve input end, and is used to extend or retract the second piston, so that when braking is required, the first reversing valve can be used to control the movement of the first piston to switch the working state of the clutch, and the second reversing valve can be used to control the movement of the second piston to brake, and at the same time, the first control valve can be used to cut off the connection between the hydraulic oil source and the multi-way valve assembly, so that the hydraulic oil source only supplies oil to the brake system to ensure the oil supply of the brake system. After braking, the second control valve can be controlled to connect the second control valve input end with the second control valve output end, so that the oil returns to the oil tank. The brake valve block assembly can control the first control valve to control the hydraulic oil source to only supply oil to the brake system when braking, thereby avoiding the problem of reduced braking force due to insufficient brake oil pressure.

[0041] The present invention also provides a braking control method, which is implemented by the above-mentioned brake valve block assembly. In the braking control method, it is determined that there is a braking demand for agricultural machinery and the target vehicle speed is obtained; the first control valve is controlled to disconnect the hydraulic oil source from the multi-way valve assembly; the first reversing valve is controlled to make the first piston extend out of the first hydraulic cylinder so that the clutch disconnects the power access, and the second reversing valve is controlled to brake. When braking is required, the first control valve is first controlled to disconnect the hydraulic oil source from the multi-way valve assembly so that the hydraulic oil source is only connected to the braking system to ensure the oil supply of the braking system, and then the first reversing valve and the second reversing valve are successively controlled to disconnect the clutch from the power access and brake. In the braking control method, when braking is required, the connection between the hydraulic oil source and the multi-way valve assembly is cut off so that the hydraulic oil source only supplies oil to the braking system, which can avoid the problem of reduced braking force due to insufficient brake oil pressure.

[0042] The present invention also provides a braking system, including the above-mentioned brake valve block assembly, and also including a first hydraulic cylinder and a second hydraulic cylinder, wherein the first piston of the first hydraulic cylinder is connected to the clutch pedal, and the second piston of the second hydraulic cylinder is connected to the brake pedal. When the agricultural machinery needs to brake, the first reversing valve can be used to control the movement of the first piston to switch the working state of the clutch, and the second reversing valve can be used to control the movement of the second piston to brake. At the same time, the first control valve can be used to cut off the connection between the hydraulic oil source and the multi-way valve assembly so that the hydraulic oil source only supplies oil to the brake system. After braking, the second control valve can be controlled to connect the second control valve input end with the second control valve output end so that the oil flows back to the oil tank. The brake valve block assembly can control the first control valve to control the hydraulic oil source to only supply oil to the brake system when braking, thereby avoiding the problem of reduced braking force due to insufficient brake oil pressure.

[0043] The present invention also provides agricultural machinery, including the above-mentioned braking system, and also including a hydraulic oil source, a multi-way valve assembly and an oil tank, wherein the two ends of the first control valve are respectively connected to the hydraulic oil source and the multi-way valve assembly, and the second control valve output end of the second control valve is connected to the oil tank. The braking system can control the first control valve to make the hydraulic oil source only supply oil to the braking system during braking, thereby avoiding the problem of reduced braking force due to insufficient brake oil pressure, thereby improving the safety of the agricultural machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 The structure of the brake valve block assembly in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0045] Figure 2 is a schematic structural diagram of a first reversing valve in an embodiment of the present invention;

[0046] Figure 3 is a schematic structural diagram of a second reversing valve in an embodiment of the present invention;

[0047] Figure 4 The structure of the brake valve block assembly in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0048] Figure 5 The structure of the brake valve block assembly in the embodiment of the present invention is shown in FIG. Figure 3 ;

[0049] Figure 6 4 is a flow chart of a braking control method in an embodiment of the present invention.

[0050] In the figure:

[0051] 100. multi-way valve assembly; 200. fuel tank;

[0052] 1. first control valve; 11. first control valve input end; 12. first control valve output end; 13. first elastic member;

[0053] 2. Second control valve; 21. Second control valve input end; 22. Second control valve output end; 23. Second elastic member;

[0054] 3. First reversing valve; 31. First input end; 32. First output end; 33. First oil return end; 34. Third elastic member;

[0055] 4. second reversing valve; 41. second input end; 42. second output end; 43. second oil return end; 44. fourth elastic member;

[0056] 5. First hydraulic cylinder; 51. First rodless chamber; 52. First rod chamber;

[0057] 6. Second hydraulic cylinder; 61. Second rodless chamber; 62. Second rod chamber;

[0058] 7. Valve block body; 71. Hydraulic oil source connection end; 72. Multi-way valve connection end; 73. Oil tank connection end; 74. First hydraulic cylinder connection end; 75. Second hydraulic cylinder connection end;

[0059] 8. Oil return pipeline; 81. Oil return connection terminal. DETAILED DESCRIPTION

[0060] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0061] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0063] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0064] In order to realize the unmanned driving of the tractor, it is usually necessary to electrically control the steering, braking and hydraulic output through different structures. Among them, the braking of the unmanned tractor usually needs to control the brake valve block. For example, the prior art provides a brake valve block assembly for a tractor, which connects the rodless chamber of the brake cylinder with a hydraulic oil source through a plurality of electromagnetic reversing valves. The hydraulic oil source is used to supply oil to the rodless chamber, or connect the rodless chamber of the brake cylinder with the oil tank to realize oil return. However, the problem is that when the tractor needs to brake, the hydraulic system should give priority to supplying oil to the brake system compared to the hydraulic output module, but the above scheme cannot give priority to supplying oil to the brake system. In the case of emergency braking, the braking force may decrease due to insufficient brake oil pressure, which leads to poor safety of the tractor.

[0065] In view of the above problems, this embodiment provides a brake valve block assembly to solve the problem in the prior art that when a tractor needs emergency braking, the braking force may decrease due to insufficient brake oil pressure, thereby causing the tractor to have poor safety, and can be used in the field of agricultural machinery technology. In this embodiment, the agricultural machinery is a tillage machine, while in other embodiments, the agricultural machinery can also be a planting machine such as a seed drill or a planter, or a harvesting machine such as an ear picker, or a machine such as a weeder.

[0066] Reference Figure 1-Figure 3The brake valve block assembly is used to connect the first hydraulic cylinder 5 and the second hydraulic cylinder 6 of the brake system. The first piston of the first hydraulic cylinder 5 is connected to the clutch pedal, and the second piston of the second hydraulic cylinder 6 is connected to the brake pedal. The clutch pedal can be driven to move by the extension and contraction of the first piston to switch the working state of the clutch so that it can be connected to power or disconnected. In addition, the brake pedal can be driven to move by the extension and contraction of the second piston to achieve braking.

[0067] Continue to refer to Figure 1-Figure 3 The brake valve block assembly includes a first control valve 1, a second control valve 2, a first reversing valve 3 and a second reversing valve 4. The two ends of the first control valve 1 are respectively used to connect the hydraulic oil source and the multi-way valve assembly 100, and are used to connect or disconnect the hydraulic oil source from the multi-way valve assembly 100, thereby controlling whether the hydraulic oil source supplies oil to the multi-way valve assembly 100. Optionally, the first control valve 1 has a first control valve input end 11 and a first control valve output end 12. The first control valve input end 11 is used to connect the hydraulic oil source, and the first control valve output end 12 is used to connect the input end of the multi-way valve assembly 100. In this embodiment, the hydraulic oil source is a motor pump, and in other embodiments, the hydraulic oil source can also be other oil supply devices. The second control valve 2 has a second control valve input end 21 and a second control valve output end 22, and the second control valve output end 22 is used to connect the oil tank 200. The second control valve 2 is used to connect or disconnect the second control valve input end 21 with the second control valve output end 22; the first reversing valve 3 is connected to the hydraulic oil source and the second control valve input end 21, and is used to extend or retract the first piston; the second reversing valve 4 is connected to the hydraulic oil source and the second control valve input end 21, and is used to extend or retract the second piston, so that when braking is required, the first reversing valve 3 can be used to control the movement of the first piston to switch the working state of the clutch, and the second reversing valve 4 can be used to control the movement of the second piston to brake, and at the same time, the connection between the hydraulic oil source and the multi-way valve assembly 100 can be cut off by the first control valve 1, so that the hydraulic oil source only supplies oil to the brake system to ensure the oil supply of the brake system. After braking, the second control valve 2 can be controlled to connect the second control valve input end 21 with the second control valve output end 22, so that the oil flows back to the oil tank. The brake valve block assembly can control the first control valve 1 during braking so that the hydraulic oil source only supplies oil to the brake system, thereby avoiding the problem of reduced braking force due to insufficient brake oil pressure.

[0068] Optionally, the first control valve 1 has a first connection position and a first disconnection position. When the first control valve 1 is located at the first connection position, the first control valve input end 11 is connected to the first control valve output end 12, and the hydraulic oil source is connected to the multi-way valve assembly 100. When the first control valve 1 is located at the first disconnection position, the first control valve input end 11 is disconnected from the first control valve output end 12, and the hydraulic oil source is disconnected from the multi-way valve assembly 100. Optionally, the first control valve 1 is connected to a first elastic member 13, and the first elastic member 13 is used to provide an elastic force to move the first control valve 1 toward the first connection position, so that in the initial state without braking, the hydraulic oil source is connected to the multi-way valve assembly 100 and can be used to supply oil to the multi-way valve assembly 100.

[0069] Optionally, the second control valve 2 has a second connection position and a second disconnection position. When the second control valve 2 is located at the second connection position, the second control valve input end 21 is connected to the second control valve output end 22, and at this time, the first reversing valve 3 and the second reversing valve 4 are both connected to the oil tank 200. When the second control valve 2 is located at the second disconnection position, the second control valve input end 21 is disconnected from the second control valve output end 22, and at this time, the first reversing valve 3 and the second reversing valve 4 are both disconnected from the oil tank 200. Optionally, the second control valve 2 is connected to a second elastic member 23, and the second elastic member 23 is used to provide an elastic force to move the second control valve 2 toward the second connection position, so that in the initial state without braking, the first reversing valve 3 and the second reversing valve 4 are both connected to the oil tank 200.

[0070] Continue to refer to Figure 1-Figure 3 , the first piston divides the inner cavity of the first hydraulic cylinder 5 into a first rodless cavity 51 and a first rod cavity 52. ​​The specific structure of the first reversing valve 3 is that it has a first input end 31, a first output end 32 and a first oil return end 33. The first input end 31 is connected to the hydraulic oil source, the first output end 32 is connected to the first rodless cavity 51, and the first oil return end 33 is connected to the second control valve input end 21. The first reversing valve 3 is used to connect the first output end 32 with the first input end 31, or with the first oil return end 33. Specifically, the first reversing valve 3 has a first initial position and a first working position. When the first reversing valve 3 is located at the first initial position, the first output end 32 is connected to the first oil return end 33; when the first reversing valve 3 is located at the first working position, the first output end 32 is connected to the first input end 31.

[0071] Optionally, the first reversing valve 3 is connected to a third elastic member 34, which is used to provide an elastic force to move the first reversing valve 3 toward a first initial position, so that in an initial state without braking, the first output end 32 is connected to the first oil return end 33 to avoid oil accumulation in the first rodless chamber 51.

[0072] Continue to refer to Figure 1-Figure 3 , the second piston divides the inner cavity of the second hydraulic cylinder 6 into a second rodless cavity 61 and a second rod cavity 62. The specific structure of the second reversing valve 4 is that it has a second input end 41, a second output end 42, and a second oil return end 43. The second input end 41 is connected to the hydraulic oil source, the second output end 42 is connected to the second rodless cavity 61, and the second oil return end 43 is connected to the second control valve input end 21. The second reversing valve 4 is used to connect the second output end 42 with the second input end 41, or with the second oil return end 43. Specifically, the second reversing valve 4 has a second initial position and a second working position. When the second reversing valve 4 is located at the second initial position, the second output end 42 is connected to the second oil return end 43; when the second reversing valve 4 is located at the second working position, the second output end 42 is connected to the second input end 41.

[0073] Optionally, the second reversing valve 4 is connected to a fourth elastic member 44, which is used to provide an elastic force to move the second reversing valve 4 toward a second initial position, so that in an initial state without braking, the second output end 42 is connected to the second oil return end 43 to avoid oil accumulation in the second rodless chamber 61.

[0074] At present, most tractors still need drivers to operate their steering, braking and hydraulic output actuators, and their electrification level is low. In order to improve the electrification level of the above tractors, there are two ways: one is to replace new tractors, and the other is to modify existing tractors. Obviously, the latter is a more suitable way. However, the brake valve block assembly provided by the existing technology is only suitable for pre-installation manufacturing by the main engine factory and used for original tractors, while there is a problem of assembly difficulty for the modification of existing tractors.

[0075] In this regard, refer to Figure 1-Figure 5The brake valve block assembly also includes a valve block body 7, a first control valve 1, a second control valve 2, a first reversing valve 3 and a second reversing valve 4 are all arranged on the valve block body 7, and the valve block body 7 has a hydraulic oil source connection end 71, a multi-way valve connection end 72, an oil tank connection end 73, a first hydraulic cylinder connection end 74 and a second hydraulic cylinder connection end 75; the hydraulic oil source connection end 71 is used to connect the hydraulic oil source and is connected to the first control valve 1; the multi-way valve connection end 72 is used to connect the multi-way valve assembly 100 and is connected to the first control valve 1; the oil tank connection end 73 is used to connect the oil tank 200 and is connected to the second control valve output end 22; the first hydraulic cylinder connection end 74 is used to connect the first rodless chamber 51 and is connected to the first output end 32; the second hydraulic cylinder connection end 75 is used to connect the second rodless chamber 61 and is connected to the second output end 42. With such a configuration, the first control valve 1, the second control valve 2, the first reversing valve 3 and the second reversing valve 4 can be integrated into the valve block body 7, and the valve block body 7 has a connection end for connecting other equipment. During installation, the multi-way valve assembly 100, the oil tank 200 and the hydraulic oil source of the existing tractor can be retained, and only the structures need to be connected to the different connection ends of the valve block body 7, so as to facilitate the modification of the existing tractor. With such a configuration, the brake valve block assembly can be used to install the aftermarket product on the manufactured product, so that the braking process is electronically controlled, while retaining the manual driving function.

[0076] Optionally, one oil tank connection terminal 73 is provided, while two hydraulic oil source connection terminals 71, multi-way valve connection terminals 72, first hydraulic cylinder connection terminals 74 and second hydraulic cylinder connection terminals 75 are provided, and one or two of them can be selected for connection according to actual conditions.

[0077] Optionally, the second control valve input end 21 of the second control valve 2 is connected to the oil return pipeline 8, the first oil return end 33 of the first reversing valve 3 and the second oil return end 43 of the second reversing valve 4 are both connected to the oil return pipeline 8, and the second control valve input end 21 is connected via the oil return pipeline 8. In order to facilitate the connection of other equipment that requires oil return to the oil tank 200, the valve block body 7 is also preset with an oil return connection end 81, and the oil return connection end 81 is connected to the oil return pipeline 8. In this embodiment, two oil return connection ends 81 are specifically provided.

[0078] Embodiment 2

[0079] This embodiment provides a brake control method, which is implemented by the brake valve block assembly in the above embodiment. Figure 6 , the braking control method includes the following steps.

[0080] S100: Determine whether the agricultural machinery has a braking demand, and obtain a target vehicle speed.

[0081] Among them, the agricultural machinery is provided with a distance sensor, which is used to detect the distance between the agricultural machinery and the obstacle in front, and send the detected distance to the controller. The controller reads the size of the distance and issues a braking demand. At the same time, the target vehicle speed is determined according to the distance between the agricultural machinery and the obstacle in front, and the deceleration of the whole vehicle is inferred from this. The valve opening of the second reversing valve is calculated through the deceleration, and finally the second hydraulic cylinder is pushed to the target position. Through a series of connecting rod movements, the brake pads are pushed to achieve different degrees of friction and obtain the target deceleration.

[0082] S110: Control the first control valve 1 to disconnect the hydraulic oil source from the multi-way valve assembly 100; control the first reversing valve 3 to extend the first piston out of the first hydraulic cylinder 5, so that the clutch disconnects the power connection.

[0083] S120: Control the second reversing valve 4 to perform braking.

[0084] In the braking control method, it is determined that there is a braking demand for agricultural machinery, and the target vehicle speed is obtained; the first control valve 1 is controlled to disconnect the hydraulic oil source from the multi-way valve assembly 100; the first reversing valve 3 is controlled to make the first piston extend out of the first hydraulic cylinder 5 so that the clutch disconnects the power access, and the second reversing valve 4 is controlled to brake. When braking is required, the first control valve 1 is first controlled to disconnect the hydraulic oil source from the multi-way valve assembly 100 so that the hydraulic oil source is only connected to the braking system to ensure the oil supply of the braking system, and then the first reversing valve 3 and the second reversing valve 4 are successively controlled to disconnect the clutch from the power access and brake. In the braking control method, when braking is required, the connection between the hydraulic oil source and the multi-way valve assembly 100 is cut off so that the hydraulic oil source only supplies oil to the braking system, which can avoid the problem of reduced braking force due to insufficient brake oil pressure.

[0085] Optionally, in the above-mentioned brake valve block assembly, when the second output end 42 is connected to the second input end 41, the opening of the second reversing valve 4 can be adjusted, thereby adjusting the flow of oil entering the second rodless chamber 61, and then controlling the extension rate of the second piston to control the magnitude of the braking force.

[0086] In step S120, the actual speed of the agricultural machinery is acquired, and the target opening of the second reversing valve 4 is determined based on the difference between the actual speed and the target speed, and the opening of the second reversing valve 4 is adjusted according to the target opening.

[0087] Specifically, a mapping relationship between the difference between the actual vehicle speed and the target vehicle speed and the opening of the second reversing valve 4 is pre-set in the controller. The actual vehicle speed of the agricultural machinery is obtained, and the difference between the actual vehicle speed and the target vehicle speed is calculated. Based on the above mapping relationship, the target opening of the second reversing valve 4 is obtained, and the opening of the second reversing valve 4 is adjusted according to the target opening.

[0088] The actual speed of the agricultural machinery can be obtained through a speed sensor installed on the agricultural machinery.

[0089] The braking control method further includes a step S130 after the step S120:

[0090] S130: Acquire the actual vehicle speed, and compare the actual vehicle speed with the target vehicle speed.

[0091] If the actual vehicle speed is greater than the target vehicle speed, the process returns to step S120; if the actual vehicle speed is not greater than the target vehicle speed, the process proceeds to step S140;

[0092] If the actual speed is greater than the target speed, it indicates that the actual speed is still high, so the process returns to step S120 to continue braking and reduce the speed. If the actual speed is not greater than the target speed, it indicates that the actual speed has been reduced to the target speed, and there is no need to return to step S120.

[0093] S140: Determine whether the actual vehicle speed is 0, and determine whether parking brake is required.

[0094] If the actual vehicle speed is 0 and parking brake is required, execute step S150; if the actual vehicle speed is 0 and parking brake is not required, execute step S160; if the actual vehicle speed is not 0, execute step S170.

[0095] S150: Control the first control valve 1 to connect the hydraulic oil source to the multi-way valve assembly 100; control the second control valve 2 to disconnect the second control valve input end 21 from the second control valve output end 22.

[0096] If the actual vehicle speed is 0 and parking brake is required, the first control valve 1 is controlled to connect the hydraulic oil source to the multi-way valve assembly 100; the second control valve 2 is controlled to disconnect the second control valve input end 21 from the second control valve output end 22. At this time, since the oil has entered the first rodless chamber 51 and the second rodless chamber 61, and the second control valve 2 is located in the second cut-off position, the second control valve input end 21 is disconnected from the second control valve output end 22. At this time, the oil in the first rodless chamber 51 and the second rodless chamber 61 cannot flow back to the oil tank, and the first piston and the second piston both remain in the extended state, thereby achieving parking brake. In addition, the first control valve 1 is located in the first connection position, and the hydraulic oil source is connected to the multi-way valve assembly 100, which does not hinder the normal operation of the multi-way valve assembly 100.

[0097] Optionally, at this time, the first reversing valve 3 is still maintained at the first working position, and the second reversing valve 4 is still maintained at the second working position, so as to further prevent the oil in the first rodless chamber 51 and the second rodless chamber 61 from flowing back.

[0098] S160: Control the first control valve 1 to connect the hydraulic oil source to the multi-way valve assembly 100; control the second control valve 2 to connect the second control valve input end 21 to the second control valve output end 22; control the second reversing valve 4 to retract the second piston.

[0099] If the actual vehicle speed is 0 and parking brake is not required, the second control valve 2 can be controlled to connect the second control valve input end 21 with the second control valve output end 22; the second reversing valve 4 can be controlled to retract the second piston, thereby reflux the oil in the first rodless chamber 51 and the second rodless chamber 61. In addition, the first control valve 1 is still located at the first connection position, and the hydraulic oil source is connected to the multi-way valve assembly 100, which does not hinder the normal operation of the multi-way valve assembly 100.

[0100] S170: Release the brake and continue driving.

[0101] If the actual vehicle speed is not 0, it indicates that the agricultural machinery is still in the driving state, so the brake is directly released and the vehicle continues to drive. Specifically, releasing the brake includes controlling the second control valve 2 to connect the second control valve input end 21 with the second control valve output end 22; controlling the first reversing valve 3 to retract the first piston; and controlling the second reversing valve 4 to retract the second piston. Whether the first control valve 1 needs to maintain the first connection position can be determined according to actual conditions.

[0102] In addition, the agricultural machinery can also be braked directly by the driver. Specifically, when the driver determines that braking is required, he or she presses the clutch pedal and the brake pedal in sequence to brake, which is consistent with the effect of the above-mentioned braking control method.

[0103] Embodiment 3

[0104] This embodiment provides a braking system, including the brake valve block assembly in the above embodiment, and the braking system also includes a first hydraulic cylinder 5 and a second hydraulic cylinder 6, wherein the first piston of the first hydraulic cylinder 5 is connected to the clutch pedal, and the second piston of the second hydraulic cylinder 6 is connected to the brake pedal. When the agricultural machinery needs to brake, the first reversing valve 3 can be used to control the movement of the first piston to switch the working state of the clutch, and the second reversing valve 4 can be used to control the movement of the second piston to brake. At the same time, the first control valve 1 can be used to cut off the connection between the hydraulic oil source and the multi-way valve assembly 100, so that the hydraulic oil source only supplies oil to the braking system. After braking, the second control valve 2 can be controlled to connect the second control valve input end 21 with the second control valve output end 22, so that the oil flows back to the oil tank. The brake valve block assembly can control the first control valve 1 to control the hydraulic oil source to only supply oil to the braking system when braking, thereby avoiding the problem of reduced braking force due to insufficient brake oil pressure.

[0105] Embodiment 4

[0106] This embodiment provides an agricultural machine, including the brake system in the above embodiment, the agricultural machine also includes a hydraulic oil source, a multi-way valve assembly 100 and an oil tank 200, the two ends of the first control valve 1 are respectively connected to the hydraulic oil source and the multi-way valve assembly 100, and the second control valve output end 22 of the second control valve 2 is connected to the oil tank 200. The brake system can control the first control valve 1 during braking so that the hydraulic oil source only supplies oil to the brake system, thereby avoiding the problem of reduced braking force due to insufficient brake oil pressure, thereby improving the safety of the agricultural machine.

[0107] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A brake valve block assembly, used to connect a first hydraulic cylinder (5) and a second hydraulic cylinder (6) of a brake system, wherein a first piston of the first hydraulic cylinder (5) is connected to a clutch pedal, and a second piston of the second hydraulic cylinder (6) is connected to a brake pedal; It is characterized in that The brake valve block assembly comprises: A first control valve (1), the two ends of which are respectively used to connect a hydraulic oil source and a multi-way valve assembly (100), and are used to connect or disconnect the hydraulic oil source from the multi-way valve assembly (100); a second control valve (2), comprising a second control valve input end (21) and a second control valve output end (22), wherein the second control valve output end (22) is used to connect to the oil tank (200), and the second control valve (2) is used to connect or disconnect the second control valve input end (21) and the second control valve output end (22); A first reversing valve (3), connected to a hydraulic oil source and an input end (21) of the second control valve, and used to extend or retract the first piston; The second reversing valve (4) is connected to the hydraulic oil source and the second control valve input end (21) and is used to extend or retract the second piston.

2. The brake valve block assembly according to claim 1, characterized in that: The first piston divides the inner cavity of the first hydraulic cylinder (5) into a first rodless cavity (51) and a first rod cavity (52); the first reversing valve (3) has a first input end (31), a first output end (32) and a first oil return end (33); the first input end (31) is connected to the hydraulic oil source; the first output end (32) is connected to the first rodless cavity (51); the first oil return end (33) is connected to the second control valve input end (21); the first reversing valve (3) is used to connect the first output end (32) to the first input end (31) or to the first oil return end (33); The second piston divides the inner cavity of the second hydraulic cylinder (6) into a second rodless cavity (61) and a second rod cavity (62); the second reversing valve (4) has a second input end (41), a second output end (42), and a second oil return end (43); the second input end (41) is connected to the hydraulic oil source; the second output end (42) is connected to the second rodless cavity (61); the second oil return end (43) is connected to the second control valve input end (21); the second reversing valve (4) is used to connect the second output end (42) to the second input end (41) or to the second oil return end (43).

3. The brake valve block assembly according to claim 2, characterized in that: The valve block also comprises a valve block body (7), wherein the first control valve (1), the second control valve (2), the first reversing valve (3) and the second reversing valve (4) are all arranged on the valve block body (7), and the valve block body (7) has a hydraulic oil source connection end (71), a multi-way valve connection end (72), an oil tank connection end (73), a first hydraulic cylinder connection end (74) and a second hydraulic cylinder connection end (75); The hydraulic oil source connection end (71) is used to connect to the hydraulic oil source and is connected to the first control valve (1); The multi-way valve connection end (72) is used to connect the multi-way valve assembly (100) and is connected to the first control valve (1); The oil tank connection end (73) is used to connect to the oil tank (200) and is connected to the second control valve output end (22); The first hydraulic cylinder connection end (74) is used to connect to the first rodless chamber (51) and is connected to the first output end (32); The second hydraulic cylinder connecting end (75) is used to connect to the second rodless chamber (61) and is connected to the second output end (42).

4. A braking control method, characterized in that: By implementing the brake valve block assembly according to any one of claims 1 to 3, the brake control method comprises: S100: determining that the agricultural machinery has a braking demand and obtaining a target vehicle speed; S110: Controlling the first control valve (1) to disconnect the hydraulic oil source from the multi-way valve assembly (100); controlling the first reversing valve (3) to extend the first piston out of the first hydraulic cylinder (5) to disconnect the clutch from power; S120: Control the second reversing valve (4) to perform braking.

5. The braking control method according to claim 4, characterized in that: The second piston divides the inner cavity of the second hydraulic cylinder (6) into a second rodless cavity (61) and a second rod cavity (62); the second reversing valve (4) has a second input end (41), a second output end (42), and a second oil return end (43); the second input end (41) is connected to the hydraulic oil source; the second output end (42) is connected to the second rodless cavity (61); the second oil return end (43) is connected to the second control valve input end (21); the second reversing valve (4) is used to connect the second output end (42) to the second input end (41) or to the second oil return end (43); when the second output end (42) is connected to the second input end (41), the opening of the second reversing valve (4) is adjustable; In step S120, the actual speed of the agricultural machinery is obtained, and the target opening of the second reversing valve (4) is determined based on the difference between the actual speed and the target speed, and the opening of the second reversing valve (4) is adjusted according to the target opening; The braking control method further includes, after step S120: S130: Acquire the actual vehicle speed, and compare the actual vehicle speed with the target vehicle speed; If the actual vehicle speed is greater than the target vehicle speed, the process returns to step S120.

6. The braking control method according to claim 5, characterized in that: In step S130, if the actual vehicle speed is not greater than the target vehicle speed, step S140 is executed; S140: Determine whether the actual vehicle speed is 0, and determine whether parking brake is required; If the actual vehicle speed is 0 and parking brake is required, execute step S150; S150: Control the first control valve (1) to connect the hydraulic oil source to the multi-way valve assembly (100); control the second control valve (2) to disconnect the second control valve input end (21) from the second control valve output end (22).

7. The braking control method according to claim 6, characterized in that: In step S140, if the actual vehicle speed is 0 and parking brake is not required, step S160 is executed; S160: Control the first control valve (1) to connect the hydraulic oil source to the multi-way valve assembly (100); control the second control valve (2) to connect the second control valve input end (21) to the second control valve output end (22); control the second reversing valve (4) to retract the second piston.

8. The braking control method according to claim 6, characterized in that: In step S140, if the actual vehicle speed is not 0, execute step S170; S170: Release the brake and continue driving.

9. A braking system, characterized in that: It comprises the brake valve block assembly as described in any one of claims 1 to 3, and also comprises a first hydraulic cylinder (5) and a second hydraulic cylinder (6), wherein the first piston of the first hydraulic cylinder (5) is connected to the clutch pedal, and the second piston of the second hydraulic cylinder (6) is connected to the brake pedal.

10. Agricultural machinery, characterized in that The brake system comprises the brake system as claimed in claim 9, and further comprises a hydraulic oil source, a multi-way valve assembly (100) and an oil tank (200), wherein two ends of the first control valve (1) are respectively connected to the hydraulic oil source and the multi-way valve assembly (100), and the second control valve output end (22) of the second control valve (2) is connected to the oil tank (200).

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