Electro-hydraulic brake system with ABS (anti-skid brake system) and driving anti-skid function and tractor

Abstract

The utility model relates to an electro-hydraulic brake system with an ABS (anti-skid brake system) and a driving anti-skid function and a tractor, and the electro-hydraulic brake system comprises an electronic control unit, an electronic pedal, an energy storage unit, four electro-hydraulic brake valves, four speed sensors and four brake cylinders, the electronic pedal, the energy storage unit, the four electro-hydraulic brake valves, the four speed sensors and the four brake cylinders are respectively in communication connection with the electronic control unit; the four electro-hydraulic brake valves are respectively provided with an oil inlet, an oil outlet and an oil return port, and the oil outlet of each electro-hydraulic brake valve can be communicated with the oil inlet or the oil return port; the four oil inlets are respectively communicated with an oil supply pipeline through pipelines, and the four oil outlets are respectively communicated with inner cavities of the four brake cylinders through pipelines; the energy storage unit is communicated with the oil supply pipeline through a pipeline. The electro-hydraulic brake has the advantages of being simple in structure, reasonable in design, capable of achieving ABS and driving anti-skid functions, capable of achieving electro-hydraulic braking, capable of achieving the ramp automatic parking function, diversified in function and convenient to use.

Description

TECHNICAL FIELD

[0001] The utility model relates to tractor braking technical field, concretely relates to electro-hydraulic braking system and tractor with ABS and drive antiskid function. BACKGROUND

[0002] The knee-turning tractor is an agricultural machinery device, mainly used for farming, seeding, harvesting and other agricultural production. Its product structure mainly includes engine, chassis, wheels, knee-turning system and other parts. The working principle of the knee-turning tractor is mainly to realize the turning of the tractor through the knee-turning system. The system adopts a hydraulic pressure assisting mechanism, realizes the knee-turning and turning of the wheels by controlling the movement of the hydraulic cylinder piston. In the knee-turning process, the hydraulic cylinder piston rod contracts, the wheels are inclined inward, and the knee-turning is realized; in the turning process, the hydraulic cylinder piston rod is elongated, the wheels are inclined outward, and the turning is realized. The advantage of the knee-turning tractor lies in that it can reduce the turning radius, making the tractor more flexible in narrow working environment. In addition, its structural design and working principle make the operation more relaxed, while maintaining good stability during turning.

[0003] At present, the knee-turning tractor in the prior art has the following problems: 1. The current knee-turning tractor does not have ABS and drive antiskid function; 2. The current braking can only rely on mechanical pedal braking, and cannot be electro-hydraulic braking; 3. Cannot realize automatic parking function on slope. UTILITY MODEL CONTENTS

[0004] The utility model provides electro-hydraulic braking system and tractor with ABS and drive antiskid function, aims at solving the problems in the prior art.

[0005] The technical scheme for solving the above technical problems of the utility model is as follows:

[0006] The electro-hydraulic braking system with ABS and drive antiskid function comprises an electronic control unit, an electronic pedal, an energy storage unit, four electro-hydraulic braking valves, four speed sensors and four brake cylinders, and the electronic pedal, the energy storage unit, the four electro-hydraulic braking valves, the four speed sensors and the four brake cylinders are respectively in communication connection with the electronic control unit.

[0007] The four electro-hydraulic braking valves are respectively provided with an oil inlet, an oil outlet and an oil return port, the oil outlet on each electro-hydraulic braking valve can be in communication with the oil inlet or the oil return port; the four oil inlets are respectively in communication with the oil supply pipeline through pipelines, and the four oil outlets are respectively in communication with the inner cavities of the four brake cylinders through pipelines; the energy storage unit is in communication with the oil supply pipeline through a pipeline.

[0008] The utility model discloses beneficial effect is: in the operation process, when the driver presses electronic pedal, brake electric signal is passed to electronic control unit through electronic pedal, and electronic control unit is converted into the current signal of electrohydraulic brake valve according to the angle signal at this time, thereby controlling the brake of four tires, if the driver presses electronic pedal at this time more heavily, electrohydraulic brake valve current signal is bigger, and when the speed sensor detection rotation speed signal is zero, electronic control unit will control corresponding tire electrohydraulic brake valve to reduce current signal, make tire rotation speed not zero, that is, can realize tractor's ABS function.

[0009] When discovering that the speed sensor signal of one of the tires is obviously greater than the speed sensor signals of the other three tires in the normal driving process, the electronic control unit will determine that one of the tires is slipping, and the electronic control unit will control the opening of the electrohydraulic brake valve to be larger, so that the braking force is larger, so as to control the rotation speed of the tire with high speed to be the same as the other three tires, thereby realizing the driving anti-slip function.

[0010] When the tractor is parked on a slope, the electronic control unit will control the electrohydraulic brake valves of the four tires to automatically brake when the speed sensor detects rotation speed, thereby realizing the slope automatic parking function.

[0011] The utility model discloses simple structure, reasonable in design has ABS and driving anti-slip function, can also electrohydraulic brake simultaneously, and can realize slope automatic parking function, and the function is various, convenient to use.

[0012] On the basis of the above technical scheme, the utility model can also be improved as follows.

[0013] Further, the oil supply pipeline includes branch pipeline one and branch pipeline two, wherein the two oil inlets are respectively communicated with the branch pipeline one through pipelines, and the remaining two oil inlets are respectively communicated with the branch pipeline two through pipelines; the energy storage unit is respectively communicated with the branch pipeline one and the branch pipeline two through pipelines.

[0014] The beneficial effect of the above further scheme is simple structure, reasonable in design, and the branch pipeline one and the branch pipeline two are used to provide oil for the four electrohydraulic brake valves, and the oil supply is convenient.

[0015] Further, the energy storage unit includes two accumulators, wherein one of the accumulators is communicated with the branch pipeline one through a pipeline, and the other accumulator is communicated with the branch pipeline two through a pipeline.

[0016] The beneficial effect of the further scheme is that the structure is simple, and the number of accumulators is designed reasonably, one of the accumulators can still provide power for braking of the corresponding two electro-hydraulic brake valves in the case of loss of power of the hydraulic system, and the other accumulator can still provide power for braking of the remaining two electro-hydraulic brake valves in the case of loss of power of the hydraulic system.

[0017] Further, a double-path liquid filling valve in communication connection with the electronic control unit is further included, the double-path liquid filling valve is provided with an interface one, an interface two, an interface three and an interface four, the interface one can be in communication with the interface two and the interface three is in communication with the interface four, or the interface one can be in communication with the interface three and the interface two is in communication with the interface four; the interface two is in communication with one end of the branch pipeline one, and the interface three is in communication with one end of the branch pipeline two; the interface one is used for oil inlet, and the interface four is used for oil return.

[0018] The beneficial effect of the further scheme is that the structure is simple and reasonable in design, and the double-path liquid filling valve is used to fill the accumulator with liquid.

[0019] Further, a pump in communication connection with the electronic control unit is further included, and the outlet of the pump is in communication with the interface one through a pipeline.

[0020] The beneficial effect of the further scheme is that the structure is simple and reasonable in design, and the pump is used to send oil to the double-path liquid filling valve, and then to the accumulator.

[0021] Further, an oil supply tank is further included, and the inlet of the pump is in communication with the oil supply tank through a pipeline.

[0022] The beneficial effect of the further scheme is that the structure is simple and reasonable in design, and the oil supply tank is used to provide oil for the entire system, and the oil supply is convenient.

[0023] Further, a pressure switch in communication connection with the electronic control unit is further included, and the pressure switch is in communication with the pipeline in the double-path liquid filling valve through a pipeline.

[0024] The beneficial effect of the further scheme is that the structure is simple and reasonable in design, and the pressure switch is used to monitor the pressure of the accumulator, when the pressure of the accumulator is lower than the set value, an alarm will be sent, and the whole vehicle is controlled to run at low speed until it stops.

[0025] Further, a brake alarm in communication connection with the electronic control unit is further included, and the brake alarm is in communication connection with the pressure switch.

[0026] The beneficial effect of the further scheme is that the structure is simple and reasonable in design, the pressure of the accumulator can be monitored by using the pressure switch, and the pressure of the accumulator is prevented from being too low; once the pressure is lower than the design value 100bar of the system, the brake alarm will brake and alarm so as to be handled in time by the operator.

[0027] Further, the oil return tank is further provided, and the four oil return ports are communicated with the oil return tank through pipelines; or four oil return tanks are further provided, and the four oil return ports are communicated with the four oil return tanks through pipelines.

[0028] The beneficial effect of the further scheme is that the structure is simple and reasonable in design, and the oil in the plurality of electro-hydraulic brake valves can be recovered by using one or more oil return tanks, and the recovery is convenient.

[0029] The utility model further relates to tractor, including the electro-hydraulic brake system with ABS and drive antiskid function as described above.

[0030] The beneficial effect of the further scheme is that the utility model further provides tractor, the structure is simple, and the design is reasonable, has ABS and drive antiskid function, can also electro-hydraulic brake simultaneously, and can realize the slope automatic parking function, and the function is various, and it is convenient to use. BRIEF DESCRIPTION OF DRAWINGS

[0031] Fig. 1 It is the whole structure schematic diagram of the utility model;

[0032] Fig. 2 It is the structure schematic diagram of two-way filling valve in the utility model;

[0033] Fig. 3 It is the structure schematic diagram of electro-hydraulic brake valve in the utility model.

[0034] In the drawings, the component list represented by each sign is as follows:

[0035] 1, electronic control unit;2, electronic pedal;3, electro-hydraulic brake valve;4, speed sensor;5, branch pipeline one;6, branch pipeline two;7, accumulator;8, two-way filling valve;9, pump;10, oil supply tank;11, pressure switch;12, brake alarm;13, oil return tank. DETAILED DESCRIPTION

[0036] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0037] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0038] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0039] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0040] Embodiment 1

[0041] As Figs. 1 to 3 shown, the embodiment provides an electro-hydraulic braking system with ABS and drive anti-skid function, including electronic control unit 1, electronic pedal 2, energy storage unit, four electro-hydraulic brake valves 3, four speed sensors 4 and four brake cylinders, the electronic pedal 2, the energy storage unit, four electro-hydraulic brake valves 3, four speed sensors 4 and four brake cylinders are respectively connected with electronic control unit 1 communication,

[0042] Four electro-hydraulic brake valves 3 are respectively provided with oil inlet, oil outlet and oil return, the oil outlet on each electro-hydraulic brake valve 3 can be communicated with the oil inlet or the oil return, four oil inlets are communicated with oil supply pipeline through pipeline respectively, four oil outlets are communicated with the inner cavity of four brake cylinders through pipeline respectively, and the energy storage unit is communicated with the oil supply pipeline through pipeline.

[0043] In the working process, when the driver steps on the electronic pedal 2, a brake electric signal is transmitted to the electronic control unit 1 through the electronic pedal 2, the electronic control unit 1 converts the angle signal at this time into an electric current signal of the electro-hydraulic brake valve 3, thereby controlling the braking of the four tires; if the driver steps on the electronic pedal 2 more heavily at this time, the electric current signal of the electro-hydraulic brake valve 3 is larger, and when the speed sensor 4 detects a zero speed signal, the electronic control unit 1 will control the corresponding electro-hydraulic brake valve 3 to reduce the electric current signal, so that the tire speed is not zero, that is, the ABS function of the tractor can be realized;

[0044] When it is found in the normal driving process that the speed sensor 4 signal of one of the tires is obviously larger than those of the other three, the electronic control unit 1 will determine that one of the tires is slipping at this time, and the electronic control unit 1 will control the opening of the electro-hydraulic brake valve 3 to be larger at this time, so that the braking force is larger, thereby controlling the speed of the tire with the faster speed to be the same as that of the other three, thereby realizing the driving anti-slip function.

[0045] When the tractor is parked on a slope, the electronic control unit 1 will control the four electro-hydraulic brake valves 3 to automatically brake when the speed sensor 4 detects a speed at this time, thereby realizing the automatic parking function on the slope.

[0046] Preferably, in the embodiment, the four electro-hydraulic brake valves 3 are three-position three-way electric proportional valves, and the opening of the valve can be controlled by controlling the electric current of the electromagnetic valve, the larger the electric current, the larger the opening, and the larger the braking pressure and braking force controlled.

[0047] In addition, the angle of the electronic pedal 2 in the braking process can be converted into an electric signal and sent to the electronic control unit 1.

[0048] The four speed sensors 4 are respectively used to provide the speed of the four wheels in real time.

[0049] Based on the above scheme, the four brake cylinders are respectively installed on the chassis of the tractor close to the four wheels, and are respectively used for braking the four wheels.

[0050] In addition, the electronic control unit 1 (equivalent to the controller in the prior art), the electronic pedal 2, the four electro-hydraulic brake valves 3 and the four speed sensors 4 respectively adopt the prior art, and the specific structure and principle will not be described here.

[0051] The embodiment has the advantages of simple structure, reasonable design, ABS and driving anti-slip functions, electro-hydraulic braking, automatic parking function on the slope, various functions and convenient use.

[0052] Embodiment 2

[0053] In this embodiment, based on embodiment 1, the oil supply pipeline comprises branch pipeline one 5 and branch pipeline two 6, wherein two of the oil inlets are respectively communicated with the branch pipeline one 5 through pipelines, and the remaining two oil inlets are respectively communicated with the branch pipeline two 6 through pipelines; the energy storage unit is respectively communicated with the branch pipeline one 5 and the branch pipeline two 6 through pipelines.

[0054] This scheme has simple structure and reasonable design, and uses the branch pipeline one 5 and the branch pipeline two 6 to supply oil to the four electro-hydraulic brake valves 3 respectively.

[0055] Embodiment 3

[0056] In this embodiment, based on embodiment 2, the energy storage unit comprises two accumulators 7, wherein one of the accumulators 7 is communicated with the branch pipeline one 5 through a pipeline, and the other accumulator 7 is communicated with the branch pipeline two 6 through a pipeline.

[0057] This scheme has simple structure and reasonable design of the number of accumulators 7, wherein one of the accumulators 7 can still provide power for braking for the corresponding two electro-hydraulic brake valves 3 in the case that the hydraulic system loses power, and the other accumulator 7 can still provide power for braking for the remaining two electro-hydraulic brake valves 3 in the case that the hydraulic system loses power.

[0058] The accumulator 7 functions to provide power for braking in the case that the hydraulic system loses power.

[0059] It should be noted that the two accumulators 7 described above are existing technologies, and their specific structures and principles will not be described here.

[0060] Embodiment 4

[0061] In this embodiment, based on any one of embodiments 2 to 3, a double-path liquid filling valve 8 is further communicated with the electronic control unit 1, the double-path liquid filling valve 8 is provided with an interface one, an interface two, an interface three and an interface four, the interface one is communicated with the interface two and the interface three is communicated with the interface four, or the interface one is communicated with the interface three and the interface two is communicated with the interface four; the interface two is communicated with one end of the branch pipeline one 5, and the interface three is communicated with one end of the branch pipeline two 6; the interface one is used for oil inlet, and the interface four is used for oil return.

[0062] This scheme has simple structure and reasonable design, and uses the double-path liquid filling valve 8 to fill the accumulator 7.

[0063] It should be noted that the double-path liquid filling valve 8 described above is an existing technology, and its specific structure and principle will not be described here.

[0064] Embodiment 5

[0065] On the basis of embodiment 4, this embodiment further comprises a pump 9 in communication connection with the electronic control unit 1, and an outlet of the pump 9 is communicated with the interface through a pipeline.

[0066] This scheme has simple structure and reasonable design, and uses the pump 9 to send oil to the double-path liquid filling valve 8, and then to the accumulator 7.

[0067] Embodiment 6

[0068] On the basis of embodiment 5, this embodiment further comprises an oil supply tank 10, and an inlet of the pump 9 is communicated with the oil supply tank 10 through a pipeline.

[0069] This scheme has simple structure and reasonable design, and uses the oil supply tank 10 to provide oil for the whole system, which is convenient for oil supply.

[0070] Embodiment 7

[0071] On the basis of any one of embodiments 4 to 6, this embodiment further comprises a pressure switch 11 in communication connection with the electronic control unit 1, and the pressure switch 11 is communicated with a pipeline in the double-path liquid filling valve 8 through a pipeline.

[0072] This scheme has simple structure and reasonable design, and uses the pressure switch 11 to monitor the pressure of the accumulator 7, when the pressure of the accumulator 7 is lower than the set value, an alarm will be sent, and the whole vehicle is controlled to run at low speed until the pressure of the accumulator 7 is monitored, so as to avoid that the pressure of the accumulator 7 is too large.

[0073] Embodiment 8

[0074] On the basis of embodiment 7, this embodiment further comprises a brake alarm 12 in communication connection with the electronic control unit 1, and the brake alarm 12 is in communication connection with the pressure switch 11.

[0075] This scheme has simple structure and reasonable design, and uses the pressure switch 11 to monitor the pressure of the accumulator 7, so as to avoid that the pressure of the accumulator 7 is too low; once the pressure is lower than the system design value 100 bar, the brake alarm 12 will send a brake alarm, so that the operator can handle it in time.

[0076] Preferably, in this embodiment, the normal pressure of the accumulator 7 is in the range of 130-160 bar.

[0077] Embodiment 9

[0078] On the basis of the above embodiments, this embodiment further comprises a return oil tank 13, and four return oil outlets are communicated with the return oil tank 13 through pipelines; or further comprises four return oil tanks 13, and four return oil outlets are communicated with the four return oil tanks 13 through pipelines.

[0079] The scheme has simple structure and reasonable design, and can recover oil in the plurality of electro-hydraulic brake valves 3 by using one or more oil recovery tanks 13.

[0080] Alternatively, the oil recovery tank 13 can also adopt other suitable number, for example, two oil recovery tanks 13, at this time, the four electro-hydraulic brake valves 3 are divided into two groups, and the two oil recovery tanks 13 recover the oil in the two pairs of electro-hydraulic brake valves 3 respectively.

[0081] Embodiment 10

[0082] On the basis of the above-mentioned embodiments, the embodiment further provides a tractor comprising the electro-hydraulic brake system with ABS and drive anti-slip function as described above.

[0083] The embodiment further provides a tractor with knee folding and steering function, which has simple structure, reasonable design, ABS and drive anti-slip function, electro-hydraulic brake function, and slope automatic parking function, and is convenient to use.

[0084] Based on the above scheme, the tractor mainly refers to a tractor with knee folding and steering function.

[0085] The working principle of the utility model is as follows:

[0086] During operation, when the driver steps on the electronic pedal 2, the brake electric signal is transmitted to the electronic control unit 1 through the electronic pedal 2, the electronic control unit 1 converts the angle signal at this time into the current signal of the electro-hydraulic brake valve 3, thereby controlling the brake of the four tires; if the driver steps on the electronic pedal 2 more heavily at this time, the current signal of the electro-hydraulic brake valve 3 is larger, and when the speed sensor 4 detects that the rotation speed signal is zero, the electronic control unit 1 will control the corresponding electro-hydraulic brake valve 3 to reduce the current signal, so that the rotation speed of the tire is not zero, that is, the ABS function of the tractor can be realized;

[0087] When it is found in the normal driving process that the speed sensor 4 signal of one of the tires is obviously larger than those of the other three, the electronic control unit 1 will determine that one of the tires is slipping, at this time, the electronic control unit 1 will control the opening of the electro-hydraulic brake valve 3 to become larger, so that the brake force becomes larger, thereby controlling the rotation speed of the tire with fast speed to be the same as that of the other three, so that the drive anti-slip function is realized.

[0088] When the tractor is parked on a slope, at this time, the speed sensor 4 detects that there is rotation speed, the electronic control unit 1 will control the electro-hydraulic brake valves 3 of the four tires to automatically brake, thereby realizing the slope automatic parking function.

[0089] It should be noted that each electronic component involved in the present application adopts the prior art, and the above-mentioned components are electrically connected with the controller, and the control circuit between the controller and each component is the prior art.

[0090] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and range of equivalent elements of the claims are intended to be embraced in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0091] In addition, it should be understood that although the present application is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

[0092] The above is only the preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. Electro-hydraulic braking system with ABS and drive anti-skid function, characterized by: The electronic control unit (1) comprises an electronic pedal (2), an energy storage unit, four electro-hydraulic brake valves (3), four speed sensors (4) and four brake cylinders, wherein the electronic pedal (2), the energy storage unit, the four electro-hydraulic brake valves (3), the four speed sensors (4) and the four brake cylinders are respectively communicatively connected to the electronic control unit (1); The four electro-hydraulic brake valves (3) are respectively provided with an oil inlet, an oil outlet and an oil return port. The oil outlet on the electro-hydraulic brake valve (3) can be communicated with the oil inlet or the oil return port; the four oil inlets are respectively communicated with the oil supply pipeline through pipelines, and the four oil outlets are respectively communicated with the inner cavities of the four brake cylinders through pipelines; the energy storage unit is communicated with the oil supply pipeline through a pipeline; The oil supply pipeline includes a branch pipeline 1 (5) and a branch pipeline 2 (6), wherein two of the oil inlets are connected to the branch pipeline 1 (5) through pipelines, and the remaining two oil inlets are connected to the branch pipeline 2 (6) through pipelines; the energy storage unit is connected to the branch pipeline 1 (5) and the branch pipeline 2 (6) through pipelines; The invention also includes a two-way filling valve (8) communicatively connected to the electronic control unit (1), wherein the two-way filling valve (8) is provided with an interface 1, an interface 2, an interface 3 and an interface 4, wherein the interface 1 can be communicated with the interface 2 and the interface 3 can be communicated with the interface 4, or the interface 1 can be communicated with the interface 3 and the interface 2 can be communicated with the interface 4; the interface 2 is communicated with one end of the branch line 1 (5), and the interface 3 is communicated with one end of the branch line 2 (6); the interface 1 is used for oil inlet, and the interface 4 is used for oil return; and the invention also includes a pump (9) communicatively connected to the electronic control unit (1), wherein the outlet of the pump (9) is communicated with the interface 1 through a pipeline.

2. The electro-hydraulic brake system with ABS and drive anti-skid function according to claim 1, characterized in that: The energy storage unit comprises two accumulators (7), one of the accumulators (7) being connected to the first branch line (5) via a pipeline, and the other accumulator (7) being connected to the second branch line (6) via a pipeline.

3. The electro-hydraulic brake system with ABS and drive anti-skid function according to claim 1, characterized in that: It also includes an oil supply tank (10), and the inlet of the pump (9) is connected to the oil supply tank (10) through a pipeline.

4. The electro-hydraulic brake system with ABS and driving anti-skid function according to claim 1, characterized in that: It also includes a pressure switch (11) that is communicatively connected to the electronic control unit (1), and the pressure switch (11) is connected to the pipeline in the two-way filling valve (8) through a pipeline.

5. The electro-hydraulic brake system with ABS and driving anti-skid function according to claim 4, characterized in that: It also includes a brake alarm (12) that is communicatively connected to the electronic control unit (1), and the brake alarm (12) is communicatively connected to the pressure switch (11).

6. The electro-hydraulic brake system with ABS and drive anti-skid function according to any one of claims 1 to 5, characterized in that: It also includes an oil return tank (13), and the four oil return ports are respectively connected to the oil return tank (13) through pipelines; or it also includes four oil return tanks (13), and the four oil return ports are respectively connected to the four oil return tanks (13) through pipelines.

7. A tractor, characterized in that: The invention comprises an electro-hydraulic brake system with ABS and drive anti-skid function as described in any one of claims 1 to 6.

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