Fluid path control device, brake system, vehicle, and control method

Abstract

The application relates to a liquid path control device, a brake system, a vehicle and a control method. The liquid path control device comprises: a first flow path adapted to be connected with an oil path of a left front wheel cylinder; a second flow path adapted to be connected with an oil path of a right front wheel cylinder; a third flow path adapted to be connected with an oil path of a right rear wheel cylinder; a fourth flow path adapted to be connected with an oil path of a left rear wheel cylinder; a first switching valve and a second switching valve used for receiving hydraulic pressure output by a pressure providing device and capable of being switched between a first state and a second state; in the first state, the first switching valve connects the first flow path and the third flow path, and the second switching valve connects the second flow path and the fourth flow path; in the second state, the first switching valve connects the first flow path and the second flow path, and the second switching valve connects the third flow path and the fourth flow path. According to the liquid path control device provided by the embodiment of the application, switching of a hydraulic circuit can be realized, so that the liquid path control device comprises at least two kinds of hydraulic circuits.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of braking, in particular to a liquid path control device, a braking system, a vehicle and a control method. BACKGROUND

[0002] In the braking system, braking is mainly realized by hydraulic or mechanical means. When braking by hydraulic means, the hydraulic pressure needs to be transmitted to the braking components by the liquid path control device to realize braking.

[0003] The hydraulic circuit of the liquid path control device in the related art is relatively single. SUMMARY

[0004] The embodiments of the present application provide a liquid path control device including at least two hydraulic circuits to at least partially solve the above technical problems.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a liquid path control device is provided, comprising:

[0006] A first flow path adapted to be connected with an oil path of a left front wheel cylinder;

[0007] A second flow path adapted to be connected with an oil path of a right front wheel cylinder;

[0008] A third flow path adapted to be connected with an oil path of a right rear wheel cylinder;

[0009] A fourth flow path adapted to be connected with an oil path of a left rear wheel cylinder;

[0010] A first switching valve and a second switching valve for receiving hydraulic pressure output by a pressure providing device, and each being switchable between a first state and a second state;

[0011] In the first state, the first switching valve connects the first flow path and the third flow path, and the second switching valve connects the second flow path and the fourth flow path; in the second state, the first switching valve connects the first flow path and the second flow path, and the second switching valve connects the third flow path and the fourth flow path.

[0012] Optionally, the second flow passage of the first switching valve and the second flow passage of the second switching valve are each used for receiving hydraulic pressure output by the pressure providing device;

[0013] The first flow passage of the first switching valve is connected with the second flow path, the third flow passage of the first switching valve is connected with the third flow path, and the second flow passage of the first switching valve is connected with the first flow path;

[0014] The first flow channel of the second switching valve is connected with the third flow channel, the third flow channel of the second switching valve is connected with the second flow channel, and the second flow channel of the second switching valve is connected with the fourth flow channel;

[0015] In the first state, the second flow channel and the third flow channel of the first switching valve are communicated, and the second flow channel and the third flow channel of the second switching valve are communicated; in the second state, the first flow channel and the second flow channel of the first switching valve are communicated, and the first flow channel and the second flow channel of the second switching valve are communicated.

[0016] Optionally, the hydraulic circuit control device further comprises a third switching valve, the third flow channel of the third switching valve is connected with the output port of the pressure providing device, and the first flow channel of the third switching valve is connected with the second flow channel of the third switching valve.

[0017] Optionally, the hydraulic circuit control device further comprises a master cylinder, and the first flow channel of the third switching valve is connected with the master cylinder.

[0018] The third switching valve is switchable between a third state and a fourth state, in the third state, the second flow channel and the third flow channel of the third switching valve are communicated, and in the fourth state, the first flow channel and the second flow channel of the third switching valve are communicated.

[0019] Optionally, the hydraulic circuit control device further comprises an oil storage member, and the master cylinder is provided with an oil hole, the oil hole being communicated with the oil storage member.

[0020] Optionally, the hydraulic circuit control device further comprises a fourth switching valve, the third flow channel of the fourth switching valve is connected with the output port of the pressure providing device, and the fourth flow channel and the second switching valve are connected with the second flow channel of the fourth switching valve.

[0021] Optionally, the hydraulic circuit control device further comprises an oil storage member, and the first flow channel of the fourth switching valve is connected with the oil storage member.

[0022] The fourth switching valve is switchable between a fifth state and a sixth state, in the fifth state, the second flow channel and the third flow channel of the fourth switching valve are communicated, and in the sixth state, the first flow channel and the second flow channel of the fourth switching valve are communicated.

[0023] Optionally, the first switching valve and the second switching valve are both two-position three-way valves; and / or, the third switching valve and the fourth switching valve are both two-position three-way valves.

[0024] Optionally, the two-position three-way valve comprises a body, a position adjusting assembly and a switching member,

[0025] The body is formed with a first flow channel, a second flow channel and a third flow channel;

[0026] The position adjusting assembly and the switching piece are both mounted on the body, the position adjusting assembly is connected with the switching piece, and the position adjusting assembly is used to drive the switching piece to move, so that the two-position three-way valve is switched between the first position and the second position.

[0027] In the first position, the second flow channel of the body and the third flow channel of the body are in communication, and in the second position, the first flow channel of the body and the second flow channel of the body are in communication.

[0028] Optionally, the position adjusting assembly comprises a driving piece and a reset piece, both of which are mounted on the body and connected with the switching piece.

[0029] The driving piece is used to drive the switching piece to move, so that the two-position three-way valve is switched from the second position to the first position.

[0030] The reset piece is used to drive the switching piece to reset, so that the two-position three-way valve is switched from the first position to the second position.

[0031] Optionally, the body is formed with a connecting flow path in communication with the second flow channel, the switching piece comprises a switching column, a first blocking block and a second blocking block, both of which are connected to the switching column, and the switching column is connected with the driving piece.

[0032] In the first position, the first blocking block disconnects the first flow channel and the connecting flow path, and in the second position, the second blocking block disconnects the third flow channel and the connecting flow path.

[0033] Optionally, the two-position three-way valve further comprises a filter piece, and at least one of the first flow channel, the second flow channel and the third flow channel is provided with the filter piece.

[0034] Optionally, the filter piece comprises a mounting seat, a first filter screen and a second filter screen, both of which are mounted on the mounting seat, and the first filter screen and the second filter screen are arranged in sequence along the flow direction of the hydraulic oil in the first flow channel or along the flow direction of the hydraulic oil in the second flow channel or along the flow direction of the hydraulic oil in the third flow channel.

[0035] Optionally, the diameter of the filter hole of the first filter screen is greater than the diameter of the filter hole of the second filter screen.

[0036] According to the second aspect of the present application, a brake system is provided, comprising a hydraulic circuit control device as described above.

[0037] According to a third aspect of the present application, a vehicle is provided, comprising the brake system as described above.

[0038] According to a fourth aspect of the present application, a control method is also provided, comprising:

[0039] obtaining driving information of the vehicle;

[0040] controlling states of the first switching valve and the second switching valve based on the driving information of the vehicle.

[0041] Optionally, the hydraulic circuit control device further comprises a third switching valve and a master cylinder, the third switching valve is connected between the pressure providing device and the first switching valve, and the third switching valve is connected with the master cylinder.

[0042] The control method further comprises:

[0043] controlling the third switching valve to communicate the first switching valve and the master cylinder when the pressure providing device is in a failure state.

[0044] Optionally, the control method further comprises: controlling the first switching valve to be in the second state.

[0045] Optionally, the hydraulic circuit control device further comprises a fourth switching valve and an oil storage member, the fourth switching valve is connected between the pressure providing device and the second switching valve, and the fourth switching valve is connected with the oil storage member.

[0046] The control method further comprises: controlling the fourth switching valve to communicate the oil storage member and the second switching valve.

[0047] In the hydraulic circuit control device of the embodiments of the present application, by making the first switching valve and the second switching valve simultaneously in the first state, at this time, the first switching valve communicates the first flow path and the third flow path, and the second switching valve communicates the second flow path and the fourth flow path, that is, at this time, the oil path of the left front wheel cylinder and the oil path of the right rear wheel cylinder are communicated, the oil path of the right front wheel cylinder and the oil path of the left rear wheel cylinder are communicated, and part of the hydraulic pressure output by the pressure providing device is transmitted to the left front wheel cylinder and the right rear wheel cylinder, and the other part of the hydraulic pressure is transmitted to the right front wheel cylinder and the left rear wheel cylinder.

[0048] By making the first switching valve and the second switching valve simultaneously in the second state, at this time, the first switching valve communicates the first flow path and the second flow path, and the second switching valve communicates the third flow path and the fourth flow path, that is, at this time, the oil path of the left front wheel cylinder and the oil path of the right front wheel cylinder are communicated, the oil path of the right rear wheel cylinder and the oil path of the left rear wheel cylinder are communicated, and part of the hydraulic pressure output by the pressure providing device is transmitted to the left front wheel cylinder and the right front wheel cylinder, and the other part of the hydraulic pressure is transmitted to the right rear wheel cylinder and the left rear wheel cylinder.

[0049] That is, when the first switching valve and the second switching valve are in different states, the hydraulic flow direction of the hydraulic circuit control device is different, and then by controlling the state switching of the first switching valve and the second switching valve, the switching of the hydraulic circuit can be realized, so that the hydraulic circuit control device at least includes two kinds of hydraulic circuits.

[0050] Other features and advantages of the present application will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0052] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0053] Figure 1 is a structural schematic diagram of a hydraulic circuit control device provided in an exemplary embodiment of the present disclosure;

[0054] Figure 2 is a structural schematic diagram of a hydraulic circuit control device provided in an exemplary embodiment of the present disclosure, wherein, Figure 2 the hydraulic circuit of Figure 1 is different;

[0055] Figure 3 is a structural schematic diagram of a hydraulic circuit control device provided in an exemplary embodiment of the present disclosure, wherein the hydraulic flow path in the figure is the hydraulic flow path when the pressure providing device is in failure;

[0056] Figure 4 is one of the structural schematic diagrams of a two-position three-way valve provided in an exemplary embodiment of the present disclosure;

[0057] Figure 5 is another structural schematic diagram of a two-position three-way valve provided in an exemplary embodiment of the present disclosure;

[0058] Figure 6 is a step flow chart of a control method provided in an exemplary embodiment of the present disclosure.

[0059] BRIEF DESCRIPTION OF DRAWINGS

[0060] 1, first flow path; 2, second flow path; 3, third flow path; 4, fourth flow path; 5, first switching valve; 6, second switching valve; 7, pressure providing device; 8, third switching valve; 9, master cylinder; 10, oil storage member; 11, left front wheel cylinder; 12, fourth switching valve; 13, body; 14, position adjusting assembly; 15, switching member; 16, filtering member; 21, right front wheel cylinder; 31, right rear wheel cylinder; 41, left rear wheel cylinder; 131, first flow channel; 132, second flow channel; 133, third flow channel; 134, connecting flow path; 141, driving member; 142, resetting member; 151, switching column; 152, first blocking block; 153, second blocking block; 161, mounting seat; 162, first filter screen; 163, second filter screen. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0062] Figures 1 to 3 The yellow lines, blue lines and green lines in the figure represent the connected flow paths.

[0063] According to a first aspect of the present application, referring to Figures 1 to 5 The present application provides a kind of liquid path control device, comprising:

[0064] First flow path 1 is suitable for and the oil line of left front wheel cylinder 11 is connected;

[0065] Second flow path 2 is suitable for and the oil line of right front wheel cylinder 21 is connected;

[0066] Third flow path 3 is suitable for and the oil line of right rear wheel cylinder 31 is connected;

[0067] Fourth flow path 4 is suitable for and the oil line of left rear wheel cylinder 41 is connected;

[0068] First switching valve 5 and second switching valve 6 are used to receive the hydraulic pressure output by pressure providing device 7, and can be switched between first state and second state;

[0069] In first state, first switching valve 5 connects first flow path 1 and third flow path 3, and second switching valve 6 connects second flow path 2 and fourth flow path 4, in second state, first switching valve 5 connects first flow path 1 and second flow path 2, and second switching valve 6 connects third flow path 3 and fourth flow path 4.

[0070] It can be understood that by making the first switching valve 5 and the second switching valve 6 simultaneously in the first state, at this time the first switching valve 5 connects the first flow path 1 and the third flow path 3, and the second switching valve 6 connects the second flow path 2 and the fourth flow path 4, that is, at this time the oil path of the left front wheel cylinder 11 and the oil path of the right rear wheel cylinder 31 are connected, and the oil path of the right front wheel cylinder 21 and the oil path of the left rear wheel cylinder 41 are connected, and a part of the hydraulic pressure output by the pressure providing device 7 is transmitted to the left front wheel cylinder 11 and the right rear wheel cylinder 31, and the other part of the hydraulic pressure is transmitted to the right front wheel cylinder 21 and the left rear wheel cylinder 41.

[0071] By making the first switching valve 5 and the second switching valve 6 simultaneously in the second state, at this time the first switching valve 5 connects the first flow path 1 and the second flow path 2, and the second switching valve 6 connects the third flow path 3 and the fourth flow path 4, that is, at this time the oil path of the left front wheel cylinder 11 and the oil path of the right front wheel cylinder 21 are connected, and the oil path of the right rear wheel cylinder 31 and the oil path of the left rear wheel cylinder 41 are connected, and a part of the hydraulic pressure output by the pressure providing device 7 is transmitted to the left front wheel cylinder 11 and the right front wheel cylinder 21, and the other part of the hydraulic pressure is transmitted to the right rear wheel cylinder 31 and the left rear wheel cylinder 41.

[0072] That is, when the first switching valve 5 and the second switching valve 6 are in different states, the hydraulic flow direction of the hydraulic circuit control device is different, and by controlling the state switching of the first switching valve 5 and the second switching valve 6, the switching of the hydraulic circuit can be realized, so that the hydraulic circuit control device at least includes two kinds of hydraulic circuits.

[0073] It can be understood that by the first switching valve 5 and the second switching valve 6, the switching of the two kinds of hydraulic circuits can be completed, which can meet different requirements, different road conditions and hydraulic oil path switching in different modes.

[0074] For example, during the turning, U-turn and the like of the vehicle, the first switching valve 5 and the second switching valve 6 are simultaneously in the first state, the hydraulic pressures of the left front wheel cylinder 11 and the right rear wheel cylinder 31 are the same, and the hydraulic pressures of the right front wheel cylinder 21 and the left rear wheel cylinder 41 are the same, so that the braking forces of the left front wheel cylinder 11 and the right rear wheel cylinder 31 are consistent, and the braking forces of the right front wheel cylinder 21 and the left rear wheel cylinder 41 are consistent, which can effectively maintain the vehicle body posture, reduce the occurrence of fishtailing and the like of the vehicle, and be more safe and reliable.

[0075] For example, in the case of straight driving, emergency braking and the like, the first switching valve 5 and the second switching valve 6 are simultaneously in the second state, the hydraulic pressures of the left front wheel cylinder 11 and the right front wheel cylinder 21 are the same, and the hydraulic pressures of the right rear wheel cylinder 31 and the left rear wheel cylinder 41 are the same, so that the braking forces of the left front wheel cylinder 11 and the right front wheel cylinder 21 are consistent, and the braking forces of the right rear wheel cylinder 31 and the left rear wheel cylinder 41 are consistent, which can prevent the vehicle from tilting and the like, and be more safe.

[0076] In some examples, the pressure providing device 7 is, for example, an electric motor piston pump.

[0077] In some embodiments, referring to Figure 1 and Figure 2 , the second flow passage 132 of the first switching valve 5 and the second flow passage 132 of the first switching valve 5 are both used to receive the hydraulic pressure output by the pressure providing device 7;

[0078] The first flow passage 131 of the first switching valve 5 is connected with the second flow passage 2, the third flow passage 133 of the first switching valve 5 is connected with the third flow passage 3, and the second flow passage 132 of the first switching valve 5 is connected with the first flow passage 1;

[0079] The first flow passage 131 of the second switching valve 6 is connected with the third flow passage 3, the third flow passage 133 of the second switching valve 6 is connected with the second flow passage 2, and the second flow passage 132 of the second switching valve 6 is connected with the fourth flow passage 4;

[0080] In the first state, the second flow passage 132 and the third flow passage 133 of the first switching valve 5 are communicated, and the second flow passage 132 and the third flow passage 133 of the second switching valve 6 are communicated, and in the second state, the first flow passage 131 and the second flow passage 132 of the first switching valve 5 are communicated, and the first flow passage 131 and the second flow passage 132 of the second switching valve 6 are communicated.

[0081] It can be understood that the hydraulic pressure output by the pressure providing device 7 can be delivered to the second flow passage 132 of the first switching valve 5 and the second flow passage 132 of the first switching valve 5.

[0082] By controlling the first switching valve 5 and the second switching valve 6 to be in the first state at the same time, at this time, the first switching valve 5 communicates the first flow passage 1 and the third flow passage 3, so that the oil passage of the left front wheel cylinder 11 and the oil passage of the right rear wheel cylinder 31 are communicated, and the second switching valve 6 communicates the second flow passage 2 and the fourth flow passage 4, so that the oil passage of the right front wheel cylinder 21 and the oil passage of the left rear wheel cylinder 41 are communicated, part of the hydraulic pressure output by the pressure providing device 7 is delivered to the left front wheel cylinder 11 and the right rear wheel cylinder 31, and the other part of the hydraulic pressure is delivered to the right front wheel cylinder 21 and the left rear wheel cylinder 41.

[0083] By controlling the first switching valve 5 and the second switching valve 6 to be in the second state at the same time, at this time, the first switching valve 5 communicates the first flow passage 1 and the second flow passage 2, so that the oil passage of the left front wheel cylinder 11 and the oil passage of the right front wheel cylinder 21 are communicated, and the second switching valve 6 communicates the third flow passage 3 and the fourth flow passage 4, so that the oil passage of the right rear wheel cylinder 31 and the oil passage of the left rear wheel cylinder 41 are communicated, part of the hydraulic pressure output by the pressure providing device 7 is delivered to the left front wheel cylinder 11 and the right front wheel cylinder 21, and the other part of the hydraulic pressure is delivered to the right rear wheel cylinder 31 and the left rear wheel cylinder 41.

[0084] That is, by controlling the states of the first switching valve 5 and the second switching valve 6, switching of the hydraulic circuit of the fluid path control device can be realized, so that the fluid path control device includes at least two hydraulic circuits.

[0085] In some embodiments, referring to Figure 1 and Figure 2 , the fluid path control device further includes a third switching valve 8, a third flow passage 133 of the third switching valve 8 is connected with the output port of the pressure providing device 7, and the first flow path 1 and the first switching valve 5 are both connected with a second flow passage 132 of the third switching valve 8.

[0086] It can be understood that by controlling the connection and disconnection between the third flow passage 133 and the second flow passage 132 of the third switching valve 8, the connection and disconnection between the pressure providing device 7 and the first switching valve 5 can be controlled, and the connection and disconnection between the first flow path 1 and the pressure providing device 7 can be controlled, that is, the third switching valve 8 can control whether the hydraulic pressure output by the pressure providing device 7 is transmitted to the first switching valve 5 and the left front wheel cylinder 11.

[0087] For example, the second flow passage 132 of the first switching valve 5 is connected with the second flow passage 132 of the third switching valve 8.

[0088] In some embodiments, referring to Figure 3 , the fluid path control device further includes a master cylinder 9, and a first flow passage 131 of the third switching valve 8 is connected with the master cylinder 9.

[0089] The third switching valve 8 can be switched between a third state and a fourth state, in the third state, the second flow passage 132 and the third flow passage 133 of the third switching valve 8 are in communication, and in the fourth state, the first flow passage 131 and the second flow passage 132 of the third switching valve 8 are in communication.

[0090] It can be understood that when the fluid path control device is normally working, the third switching valve 8 can be controlled to be in the third state, so that the second flow passage 132 and the third flow passage 133 of the third switching valve 8 are in communication, the pressure output by the pressure providing device 7 can be transmitted to the first switching valve 5 and the left front wheel cylinder 11, and the first switching valve 5 can make the hydraulic pressure of the left front wheel cylinder 11 same as the hydraulic pressure of the right front wheel cylinder 21, or make the hydraulic pressure of the left front wheel cylinder 11 same as the hydraulic pressure of the right rear wheel cylinder 31. At the same time, the third switching valve 8 can also disconnect the first flow passage 131 and the second flow passage 132, so as to separate the master cylinder 9 and the first switching valve 5, separate the master cylinder 9 and the first flow path, and avoid the influence of the master cylinder 9 on the hydraulic pressure transmission.

[0091] It can be understood that when the pressure providing device 7 fails, it means that the pressure providing device 7 can no longer continue to increase the hydraulic pressure of the wheel cylinders. At this time, the third switching valve 8 is controlled to be in the fourth state to communicate the first switching valve 5 and the master cylinder 9, so that the two wheel cylinders connected by the first switching valve 5 can be directly communicated with the master cylinder 9. When the brake pedal is stepped on, the hydraulic oil in the master cylinder 9 can pass to the two wheel cylinders connected with the first switching valve 5, realizing mechanical braking and avoiding direct loss of braking force.

[0092] In some embodiments, referring to Figure 3 , the hydraulic circuit control device further comprises an oil storage member 10, and the master cylinder 9 is provided with an oil hole communicated with the oil storage member 10.

[0093] It can be understood that the hydraulic oil output by the pressure providing device 7 will be transmitted to the two wheel cylinders communicated by the first switching valve 5. When the pressure providing device 7 suddenly fails during the output of pressure, the two wheel cylinders communicated by the first switching valve 5 will remain the hydraulic oil output by the pressure providing device 7. At this time, the third switching valve 8 can be controlled to be in the fourth state, and the third switching valve 8 communicates the first switching valve 5 and the master cylinder 9, so that the hydraulic oil in the two wheel cylinders communicated by the first switching valve 5 can return to the oil storage member 10 through the oil hole of the master cylinder 9, ensuring that the hydraulic oil in the two wheel cylinders communicated by the first switching valve 5 can return to the oil storage member 10 in the case of failure of the pressure providing device 7.

[0094] In some embodiments, referring to Figure 3 , the hydraulic circuit control device further comprises a fourth switching valve 12, the third flow passage 133 of the fourth switching valve 12 is connected with the output port of the pressure providing device 7, and the fourth flow passage 4 and the second switching valve 6 are connected with the second flow passage 132 of the fourth switching valve 12.

[0095] It can be understood that by controlling the on-off between the third flow passage 133 and the second flow passage 132 of the fourth switching valve 12, the on-off between the pressure providing device 7 and the second switching valve 6 can be controlled, and the on-off between the fourth flow passage 4 and the pressure providing device 7 can be controlled, that is, the fourth switching valve 12 can control whether the hydraulic oil output by the pressure providing device 7 is transmitted to the second switching valve 6 and the left rear wheel cylinder 41.

[0096] For example, the second flow passage 132 of the second switching valve 6 is connected with the second flow passage 132 of the fourth switching valve 12.

[0097] In some embodiments, referring to Figure 3 , the hydraulic circuit control device further comprises an oil storage member 10, and the first flow passage 131 of the fourth switching valve 12 is connected with the oil storage member 10;

[0098] The fourth switching valve 12 can be switched between a fifth state and a sixth state. In the fifth state, the second flow passage 132 and the third flow passage 133 of the fourth switching valve 12 are communicated. In the sixth state, the first flow passage 131 and the second flow passage 132 of the fourth switching valve 12 are communicated.

[0099] It can be understood that when the liquid path control device is normally working, the fourth switching valve 12 is controlled to be in the fifth state, so that the second flow passage 132 and the third flow passage 133 of the fourth switching valve 12 are communicated, and the hydraulic pressure output by the pressure providing device 7 can be transmitted to the second switching valve 6 and the left rear wheel cylinder 41. At the same time, the fourth switching valve 12 can also disconnect the first flow passage 131 and the second flow passage 132, so as to separate the oil storage member 10 and the second switching valve 6, and separate the oil storage member 10 and the fourth oil path, thereby avoiding the influence of the oil storage member 10 on the hydraulic pressure transmission.

[0100] It can be understood that the hydraulic oil output by the pressure providing device 7 can be transmitted to the two wheel cylinders communicated by the second switching valve 6. When the pressure providing device 7 suddenly fails during the output of pressure, the two wheel cylinders communicated by the second switching valve 6 can store the hydraulic oil output by the pressure providing device 7. At this time, the fourth switching valve 12 can be controlled to be in the sixth state, so that the second switching valve 6 and the oil storage member 10 are communicated, and the hydraulic oil in the two wheel cylinders communicated by the second switching valve 6 can return to the oil storage member 10, thereby ensuring that the hydraulic oil in the two wheel cylinders communicated by the second switching valve 6 can return to the oil storage member 10 when the pressure providing device 7 fails.

[0101] In some examples, the oil storage member 10 is, for example, an oil tank.

[0102] In some embodiments, the first switching valve 5 and the second switching valve 6 are both two-position three-way valves.

[0103] It can be understood that using a two-position three-way valve as the first switching valve 5 and the second switching valve 6 can effectively reduce the number of valves and the number of oil paths required by the liquid path control device.

[0104] In some embodiments, the third switching valve 8 and the fourth switching valve 12 are both two-position three-way valves.

[0105] It can be understood that using a two-position three-way valve as the third switching valve 8 and the fourth switching valve 12 can effectively reduce the number of valves and the number of oil paths required by the liquid path control device.

[0106] In some embodiments, referring to Figure 4 and Figure 5 , the two-position three-way valve comprises a body 13, a position adjusting assembly 14 and a switching member 15,

[0107] The body 13 is formed with a first flow passage 131, a second flow passage 132 and a third flow passage 133;

[0108] The position adjusting assembly 14 and the switching piece 15 are both mounted on the body 13, the position adjusting assembly 14 is connected with the switching piece 15, and the position adjusting assembly 14 is used to drive the switching piece 15 to move, so that the two-position three-way valve is switched between the first position and the second position;

[0109] In the first position, the second flow passage 132 of the body 13 and the third flow passage 133 of the body 13 are communicated, and in the second position, the first flow passage 131 of the body 13 and the second flow passage 132 of the body 13 are communicated.

[0110] It can be understood that the switching piece 15 can switch the two-position three-way valve between the first position and the second position by driving the switching piece 15 to move through the position adjusting assembly 14. In the first position, the second flow passage 132 and the third flow passage 133 of the two-position three-way valve are communicated, and in the second position, the first flow passage 131 and the second flow passage 132 of the two-position three-way valve are communicated, so that the two-position three-way valve can communicate different flow paths in different positions.

[0111] It can be understood that when the first switching valve 5 and the second switching valve 6 are two-position three-way valves, the two-position three-way valve in the first position is the first switching valve 5 and the second switching valve 6 in the first state, and the two-position three-way valve in the second position is the first switching valve 5 and the second switching valve 6 in the second state.

[0112] When the third switching valve 8 is a two-position three-way valve, the two-position three-way valve in the first position is the third switching valve 8 in the first state, and the two-position three-way valve in the second position is the third switching valve 8 in the second state.

[0113] When the fourth switching valve 12 is a two-position three-way valve, the two-position three-way valve in the first position is the fourth switching valve 12 in the first state, and the two-position three-way valve in the second position is the fourth switching valve 12 in the second state.

[0114] In some embodiments, referring to Figure 4 and Figure 5 The position adjusting assembly 14 includes a driving piece 141 and a reset piece 142, both of which are mounted on the body 13, and both of which are connected with the switching piece 15;

[0115] The driving piece 141 is used to drive the switching piece 15 to move, so that the two-position three-way valve is switched from the second position to the first position;

[0116] The reset piece 142 is used to drive the switching piece 15 to reset, so that the two-position three-way valve is switched from the first position to the second position.

[0117] It can be understood that when the two-position three-way valve needs to be in the first position, the driving member 141 is controlled to work, so that the driving member 141 drives the switching member 15 to move in the first direction, and then the two-position three-way valve is in the first position.

[0118] When the two-position three-way valve needs to be in the second position, the driving member 141 is controlled to stop working, and at this time the reset member 142 can drive the switching member 15 to move in the second direction, so that the two-position three-way valve can be switched to the second position.

[0119] Exemplarily, the first direction and the second direction are opposite.

[0120] In some examples, the reset member 142 is a spring, for example.

[0121] In some examples, the driving member 141 includes a static core, a dynamic core and a coil, the dynamic core is located in the coil, and the switching member 15 is connected to the dynamic core. When the coil is powered, the dynamic core moves relative to the static core to drive the switching member 15 to move.

[0122] The reset member 142 is connected between the dynamic core and the static core, and provides a reset force for the dynamic core, so that the switching member 15 is reset.

[0123] The coil is arranged on the limiting support, and the magnetic shield is arranged outside the dynamic core and limits the dynamic core and prevents magnetic wave interference.

[0124] In some examples, the switching member 15 is a threaded needle, for example. The upper end of the threaded needle is connected to the dynamic core through threads, so that the movement of the threaded needle is consistent with the movement of the dynamic core.

[0125] In some embodiments, referring to Figure 4 and Figure 5 The body 13 is formed with a connecting flow path 134 in communication with the second flow channel 132, the switching member 15 includes a switching column 151, a first blocking block 152 and a second blocking block 153, the first blocking block 152 and the second blocking block 153 are connected to the switching column 151, and the switching column 151 is connected to the driving member 141.

[0126] In the first position, the first blocking block 152 disconnects the first flow channel 131 and the connecting flow path 134, and in the second position, the second blocking block 153 disconnects the third flow channel 133 and the connecting flow path 134.

[0127] Understandably, the switching column 151 is connected to the position adjustment assembly 14. The position adjustment assembly 14 moves the switching column 151, causing the first blocking block 152 and the second blocking block 153 connected to it to move as well. This allows the first blocking block 152 to move to a position that blocks the first flow channel 131 and the connecting flow path 134, thus disconnecting the first flow channel 131 and the connecting flow path 134. This also disconnects the first flow channel 131 and the second flow channel 132, leaving the two-position three-way valve with only the third flow channel 133 and the second flow channel 132 connected. Furthermore, the position adjustment assembly 14 can also move the switching column 151 to a position that blocks the third flow channel 133 and the connecting flow path 134, thus disconnecting the third flow channel 133 and the second flow channel 132. This leaves the two-position three-way valve with only the first flow channel 131 and the second flow channel 132 connected. In other words, by moving the first blocking block 152 and the second blocking block 153, the two-position three-way valve can be switched between the first position and the second position.

[0128] Connecting the first blocking block 152 and the second blocking block 153 to the switching column 151 simultaneously ensures that the first blocking block 152 and the second blocking block 153 move at the same time, thus avoiding the situation where the three flow channels of the two-position three-way valve are connected simultaneously due to the asynchronous movement of the first blocking block 152 and the second blocking block 153.

[0129] It is understood that, along the length of the connecting flow path 134, the first flow channel 131, the second flow channel 132, and the third flow channel 133 are arranged sequentially. The switching column 151 is movably disposed in the connecting flow path 134. The position adjustment component 14 drives the switching column 151 to move at the connecting flow path 134, thereby enabling the two-position three-way valve to switch between the first position and the second position.

[0130] The position adjustment component 14 drives the switching column 151 to move along the connecting flow path 134 in the first direction, so that the two-position three-way valve is in the first position. At this time, the hydraulic oil flows along the direction of the second flow path 132 and the third flow path 133. At this time, the direction of the pressure applied by the hydraulic oil to the first sealing block 152 and the switching column 151 is also in the first direction, which can keep the first sealing block 152 in the position of disconnecting the first flow path 131 and the connecting flow path 134, and can prevent hydraulic oil from leaking into the first flow path 131.

[0131] The position adjustment component 14 drives the switching column 151 to move along the connecting flow path 134 in the second direction, so that the two-position three-way valve is in the second position. At this time, the hydraulic oil flows along the direction of the second flow path 132 and the first flow path 131. At this time, the direction of the pressure applied by the hydraulic oil to the second sealing block 153 and the switching column 151 is also in the second direction, which can keep the second sealing block 153 in the position of disconnecting the third flow path 133 and the connecting flow path 134, and can prevent hydraulic oil from leaking into the third flow path 133.

[0132] Understandably, when the third switching valve 8 is a two-position three-way valve, if the third switching valve 8 fails due to power failure, the first and second flow channels of the third switching valve 8 are connected, while the third and second flow channels are disconnected, and the third flow channel is connected to the pressure supply device 7. When the vehicle is still attempting to brake, the pressure supply device 7 will supply hydraulic pressure to the third flow channel 3. When the hydraulic pressure at the third flow channel 3 is greater than the force of the reset member 142, the second sealing block 153 can move, causing the third flow channel 133 to connect with the connecting flow channel 134, that is, reconnecting the third flow channel 133 and the second flow channel 132, and reconnecting the pressure supply device 7 to the wheel cylinder. This ensures that the braking force is still stably output and protects the electronic components and oil circuit.

[0133] Understandably, when the pressure supply device 7 fails, the third switching valve 8 can be in the fourth state and the fourth switching valve 12 can be in the sixth state to disconnect the second flow channel 132 and the third flow channel 133, so as to prevent hydraulic oil from flowing to the pressure supply device 7 through the third flow channel 133, which would result in insufficient braking force or insufficient power of the pressure supply device 7.

[0134] In some examples, the different components of a two-position three-way valve can be assembled by riveting, reducing the difficulty of machining.

[0135] In some examples, the first blocking block 152 and the second blocking block 153 are both integrally formed with the switching column 151.

[0136] In some examples, the first sealing block 152 and the second sealing block 153 are, for example, spherical structures.

[0137] In some embodiments, see Figure 4 and Figure 5 The two-position three-way valve also includes a filter element 16, and the filter element 16 is provided at least one of the first flow channel 131, the second flow channel 132 and the third flow channel 133.

[0138] Understandably, the filter element 16 can filter the hydraulic oil flowing through the first flow channel 131, the second flow channel 132, or the third flow channel 133, removing particles from the hydraulic oil to ensure that the two-position three-way valve and the oil circuit control device can operate stably and normally.

[0139] In some embodiments, see Figure 4 and Figure 5 The filter element 16 includes a mounting base 161, a first filter screen 162, and a second filter screen 163. The first filter screen 162 and the second filter screen 163 are both mounted on the mounting base 161. The first filter screen 162 and the second filter screen 163 are arranged sequentially along the flow direction of the hydraulic oil in the first flow channel 131, or along the flow direction of the hydraulic oil in the second flow channel 132, or along the flow direction of the hydraulic oil in the third flow channel 133.

[0140] Understandably, both the first filter screen 162 and the second filter screen 163 can filter particles in the hydraulic oil, achieving dual filtration.

[0141] In some embodiments, the diameter of the filter holes of the first filter 162 is larger than the diameter of the filter holes of the second filter 163.

[0142] Understandably, the first filter screen 162 can first coarsely screen the hydraulic oil, and then the second filter screen 163 can finely screen the hydraulic oil to effectively remove particles from the hydraulic oil.

[0143] According to a second aspect of this application, this application provides a braking system including the aforementioned hydraulic control device.

[0144] Understandably, by simultaneously placing the first switching valve 5 and the second switching valve 6 in the first state, the first switching valve 5 connects the first flow path 1 and the third flow path 3, and the second switching valve 6 connects the second flow path 2 and the fourth flow path 4. That is, at this time, the oil circuit of the left front wheel cylinder 11 is connected to the oil circuit of the right rear wheel cylinder 31, and the oil circuit of the right front wheel cylinder 21 is connected to the oil circuit of the left rear wheel cylinder 41. Part of the hydraulic pressure output by the pressure supply device 7 is transmitted to the left front wheel cylinder 11 and the right rear wheel cylinder 31, and the other part of the hydraulic pressure is transmitted to the right front wheel cylinder 21 and the left rear wheel cylinder 41.

[0145] By simultaneously placing the first switching valve 5 and the second switching valve 6 in the second state, the first switching valve 5 connects the first flow path 1 and the second flow path 2, and the second switching valve 6 connects the third flow path 3 and the fourth flow path 4. That is, at this time, the oil circuit of the left front wheel cylinder 11 and the oil circuit of the right front wheel cylinder 21 are connected, and the oil circuit of the right rear wheel cylinder 31 and the oil circuit of the left rear wheel cylinder 41 are connected. Part of the hydraulic pressure output by the pressure supply device 7 is transmitted to the left front wheel cylinder 11 and the right front wheel cylinder 21, and the other part of the hydraulic pressure is transmitted to the right rear wheel cylinder 31 and the left rear wheel cylinder 41.

[0146] In other words, when the first switching valve 5 and the second switching valve 6 are in different states, the hydraulic flow direction of the hydraulic circuit control device is different. Therefore, by controlling the switching of the states of the first switching valve 5 and the second switching valve 6, the switching of the hydraulic circuit can be realized, so that the hydraulic circuit control device includes at least two hydraulic circuits.

[0147] According to a third aspect of this application, this application provides a vehicle including the braking system described above.

[0148] Understandably, by simultaneously placing the first switching valve 5 and the second switching valve 6 in the first state, the first switching valve 5 connects the first flow path 1 and the third flow path 3, and the second switching valve 6 connects the second flow path 2 and the fourth flow path 4. That is, at this time, the oil circuit of the left front wheel cylinder 11 is connected to the oil circuit of the right rear wheel cylinder 31, and the oil circuit of the right front wheel cylinder 21 is connected to the oil circuit of the left rear wheel cylinder 41. Part of the hydraulic pressure output by the pressure supply device 7 is transmitted to the left front wheel cylinder 11 and the right rear wheel cylinder 31, and the other part of the hydraulic pressure is transmitted to the right front wheel cylinder 21 and the left rear wheel cylinder 41.

[0149] By simultaneously placing the first switching valve 5 and the second switching valve 6 in the second state, the first switching valve 5 connects the first flow path 1 and the second flow path 2, and the second switching valve 6 connects the third flow path 3 and the fourth flow path 4. That is, at this time, the oil circuit of the left front wheel cylinder 11 and the oil circuit of the right front wheel cylinder 21 are connected, and the oil circuit of the right rear wheel cylinder 31 and the oil circuit of the left rear wheel cylinder 41 are connected. Part of the hydraulic pressure output by the pressure supply device 7 is transmitted to the left front wheel cylinder 11 and the right front wheel cylinder 21, and the other part of the hydraulic pressure is transmitted to the right rear wheel cylinder 31 and the left rear wheel cylinder 41.

[0150] In other words, when the first switching valve 5 and the second switching valve 6 are in different states, the hydraulic flow direction of the hydraulic circuit control device is different. Therefore, by controlling the switching of the states of the first switching valve 5 and the second switching valve 6, the switching of the hydraulic circuit can be realized, so that the hydraulic circuit control device includes at least two hydraulic circuits.

[0151] In some examples, the vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this application does not specifically limit this.

[0152] According to the fourth aspect of this application, see Figure 6 This application provides a control method, comprising:

[0153] Step 100: Obtain vehicle driving information;

[0154] Step 200: Based on the vehicle's driving information, control the state of the first switching valve 5 and the second switching valve 6.

[0155] It is understandable that the first switching valve 5 and the second switching valve 6 are switched between the first state and the second state according to the vehicle's driving information. The hydraulic circuits of the hydraulic circuit control device are different for the different states of the first switching valve 5 and the second switching valve 6. That is, the hydraulic circuit can be adjusted according to the vehicle's driving information, so that the hydraulic circuit can be more adapted to the current vehicle driving conditions, improve vehicle driving safety, make the vehicle braking more diverse, and enrich the vehicle's control strategy.

[0156] Understandably, with the development of autonomous driving technology, braking systems are gradually moving away from manual braking, and vehicles need to make reasonable braking decisions based on actual operating conditions. In related technologies, hydraulic circuits are relatively simple and cannot meet the safety requirements of autonomous driving braking control. This application, however, controls the states of the first switching valve 5 and the second switching valve 6 based on vehicle driving information, making the hydraulic circuit match the current vehicle driving conditions, improving vehicle driving safety, and providing more diversified control strategies.

[0157] In some examples, vehicle driving information includes whether the vehicle is turning, making a U-turn, traveling in a straight line, or undergoing emergency braking.

[0158] In some embodiments, the hydraulic control device further includes a third switching valve 8 and a master cylinder 9, wherein the third switching valve 8 is connected between the pressure supply device 7 and the first switching valve 5, and the third switching valve 8 is connected to the master cylinder 9;

[0159] Control methods also include:

[0160] When the pressure supply device 7 is in a faulty state, the third switching valve 8 is controlled to connect the first switching valve 5 and the master cylinder 9.

[0161] Understandably, when the pressure supply device 7 malfunctions, it means that the pressure supply device 7 can no longer continue to increase the hydraulic pressure to the wheel cylinders. At this time, the third switching valve 8 is controlled to connect the first switching valve 5 and the master cylinder 9, so that the two wheel cylinders connected to the first switching valve 5 can be directly connected to the master cylinder 9. When the brake pedal is pressed, the hydraulic oil in the master cylinder 9 can flow to the two wheel cylinders connected to the first switching valve 5 to achieve mechanical braking and avoid direct loss of braking force.

[0162] Understandably, the hydraulic oil output by the pressure supply device 7 is transmitted to the two wheel cylinders connected by the first switching valve 5. When the pressure supply device 7 suddenly malfunctions during pressure output, hydraulic oil output by the pressure supply device 7 will remain in the two wheel cylinders connected by the first switching valve 5. At this time, the third switching valve 8 can be controlled to connect the first switching valve 5 and the master cylinder 9, so that the hydraulic oil in the two wheel cylinders connected by the first switching valve 5 can return to the oil reservoir 10 through the oil hole of the master cylinder 9, ensuring that the hydraulic oil in the two wheel cylinders connected by the first switching valve 5 can return to the oil reservoir 10 in the event of a malfunction of the pressure supply device 7.

[0163] It is understandable that when the third switching valve 8 is connected to the first switching valve 5 and the master cylinder 9, it means that the third switching valve 8 is in the fourth state, that is, the second flow channel 132 and the third flow channel 133 are disconnected, which can prevent hydraulic oil from flowing through the third flow channel 133 to the pressure supply device 7, resulting in insufficient braking force or insufficient power of the pressure supply device 7.

[0164] In some embodiments, the control method further includes controlling the first switching valve 5 to be in a second state.

[0165] Understandably, when the pressure supply device 7 malfunctions, due to inertia, the pressure of the vehicle's front wheels on the ground is relatively high. Therefore, the first switching valve 5 is controlled to be in the second state, so that the first switching valve 5 connects the oil circuit of the left front wheel cylinder 11 and the oil circuit of the right front wheel cylinder 21, so that the oil circuits of the left front wheel cylinder 11 and the right front wheel cylinder 21 are both connected to the master cylinder 9. The hydraulic oil in the master cylinder 9 can be directed to the left front wheel cylinder 11 and the right front wheel cylinder 21 to achieve braking of the two front wheels of the vehicle.

[0166] In some embodiments, the hydraulic control device further includes a fourth switching valve 12 and an oil reservoir 10. The fourth switching valve 12 is connected between the pressure supply device 7 and the second switching valve 6, and the fourth switching valve 12 is connected to the oil reservoir 10.

[0167] The control method also includes controlling the fourth switching valve 12 to connect the oil reservoir 10 and the second switching valve 6.

[0168] Understandably, the hydraulic oil output by the pressure supply device 7 is transmitted to the two cylinders connected by the second switching valve 6. When the pressure supply device 7 suddenly malfunctions during pressure output, hydraulic oil output by the pressure supply device 7 will remain in the two cylinders connected by the second switching valve 6. At this time, the fourth switching valve 12 can be controlled to connect the second switching valve 6 and the oil reservoir 10, so that the hydraulic oil in the two cylinders connected by the second switching valve 6 can return to the oil reservoir 10, ensuring that the hydraulic oil in the two cylinders connected by the second switching valve 6 can return to the oil reservoir 10 in the event of a malfunction of the pressure supply device 7.

[0169] It is understandable that when the fourth switching valve 12 connects the oil reservoir 10 and the second switching valve 6, it means that the fourth switching valve 12 is in the sixth state, that is, the second flow channel 132 and the third flow channel 133 are disconnected, which can prevent hydraulic oil from flowing through the third flow channel 133 to the pressure supply device 7, resulting in insufficient braking force or insufficient power of the pressure supply device 7.

[0170] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0171] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0172] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0173] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A liquid circuit control device, characterized in that, include: The first flow path is suitable for connection with the oil circuit of the left front wheel cylinder; The second flow path is suitable for connection with the oil circuit of the right front wheel cylinder; The third flow path is suitable for connection with the oil circuit of the right rear wheel cylinder; The fourth flow path is suitable for connection to the oil circuit of the left rear wheel cylinder; The first switching valve and the second switching valve are used to receive hydraulic pressure output from the pressure supply device, and both can switch between the first state and the second state. In the first state, the first switching valve connects the first flow path and the third flow path, and the second switching valve connects the second flow path and the fourth flow path. In the second state, the first switching valve connects the first flow path and the second flow path, and the second switching valve connects the third flow path and the fourth flow path.

2. The liquid circuit control device according to claim 1, characterized in that, Both the second flow passage of the first switching valve and the second flow passage of the first switching valve are used to receive hydraulic pressure output from the pressure supply device; The first flow channel of the first switching valve is connected to the second flow path, the third flow channel of the first switching valve is connected to the third flow path, and the second flow channel of the first switching valve is connected to the first flow path; The first flow path of the second switching valve is connected to the third flow path, the third flow path of the second switching valve is connected to the second flow path, and the second flow path of the second switching valve is connected to the fourth flow path. In the first state, the second and third flow channels of the first switching valve are connected, and the second and third flow channels of the second switching valve are connected. In the second state, the first and second flow channels of the first switching valve are connected, and the first and second flow channels of the second switching valve are connected.

3. The liquid circuit control device according to claim 1, characterized in that, The liquid circuit control device further includes a third switching valve, the third flow channel of which is connected to the output port of the pressure supply device, and the first flow path and the first switching valve are both connected to the second flow channel of the third switching valve.

4. The liquid circuit control device according to claim 3, characterized in that, The hydraulic control device also includes a master cylinder, and the first flow channel of the third switching valve is connected to the master cylinder; The third switching valve can switch between a third state and a fourth state. In the third state, the second flow channel and the third flow channel of the third switching valve are connected. In the fourth state, the first flow channel and the second flow channel of the third switching valve are connected.

5. The liquid circuit control device according to claim 4, characterized in that, The hydraulic control device also includes an oil reservoir, and the main cylinder is provided with an oil hole, which is connected to the oil reservoir.

6. The liquid circuit control device according to claim 3, characterized in that, The liquid circuit control device further includes a fourth switching valve, the third flow path of which is connected to the output port of the pressure supply device, and both the fourth flow path and the second switching valve are connected to the second flow path of the fourth switching valve.

7. The liquid circuit control device according to claim 6, characterized in that, The liquid circuit control device also includes an oil storage component, and the first flow channel of the fourth switching valve is connected to the oil storage component; The fourth switching valve can switch between a fifth state and a sixth state. In the fifth state, the second and third flow channels of the fourth switching valve are connected, and in the sixth state, the first and second flow channels of the fourth switching valve are connected.

8. The liquid circuit control device according to claim 6, characterized in that, The first switching valve and the second switching valve are both two-position three-way valves; and / or, the third switching valve and the fourth switching valve are both two-position three-way valves.

9. The liquid circuit control device according to claim 8, characterized in that, The two-position three-way valve includes a body, a position adjustment assembly, and a switching component. The body has a first flow channel, a second flow channel, and a third flow channel; Both the position adjustment component and the switching component are mounted on the body. The position adjustment component is connected to the switching component. The position adjustment component is used to drive the switching component to move so that the two-position three-way valve switches between the first position and the second position. In the first position, the second flow channel and the third flow channel of the body are connected; in the second position, the first flow channel and the second flow channel of the body are connected.

10. The liquid circuit control device according to claim 9, characterized in that, The position adjustment component includes a driving component and a reset component, both of which are mounted on the body and connected to the switching component. The driving component is used to move the switching component so that the two-position three-way valve is switched from the second position to the first position; The reset component is used to drive the switching component to reset, so that the two-position three-way valve switches from the first position to the second position.

11. The liquid circuit control device according to claim 10, characterized in that, The body has a connecting flow path that communicates with the second flow channel. The switching component includes a switching post, a first blocking block and a second blocking block. The first blocking block and the second blocking block are both connected to the switching post. The switching post is connected to the driving component. In the first position, the first blocking block disconnects the first flow channel and the connecting flow path; in the second position, the second blocking block disconnects the third flow channel and the connecting flow path.

12. The liquid circuit control device according to any one of claims 8 to 11, characterized in that, The two-position three-way valve also includes a filter element, which is provided at least one of the first flow channel, the second flow channel and the third flow channel.

13. The liquid circuit control device according to claim 12, characterized in that, The filter element includes a mounting base, a first filter screen, and a second filter screen. Both the first filter screen and the second filter screen are mounted on the mounting base and are arranged sequentially along the flow direction of hydraulic oil in the first flow channel, the flow direction of hydraulic oil in the second flow channel, or the flow direction of hydraulic oil in the third flow channel.

14. The liquid circuit control device according to claim 13, characterized in that, The diameter of the filter holes in the first filter screen is larger than the diameter of the filter holes in the second filter screen.

15. A braking system, characterized in that, Includes the liquid circuit control device as described in any one of claims 1 to 14.

16. A vehicle, characterized in that, Includes the braking system as described in claim 15.

17. A control method, characterized in that, The control method, applied to the liquid circuit control device as described in claim 1, comprises: Obtain vehicle driving information; Based on the vehicle's driving information, the states of the first switching valve and the second switching valve are controlled.

18. The control method according to claim 17, characterized in that, The hydraulic control device further includes a third switching valve and a main cylinder. The third switching valve is connected between the pressure supply device and the first switching valve, and the third switching valve is connected to the main cylinder. The control method further includes: When the pressure supply device is in a faulty state, the third switching valve is controlled to connect the first switching valve and the master cylinder.

19. The control method according to claim 18, characterized in that, The control method further includes: controlling the first switching valve to be in the second state.

20. The control method according to claim 17, characterized in that, The hydraulic control device further includes a fourth switching valve and an oil reservoir. The fourth switching valve is connected between the pressure supply device and the second switching valve, and the fourth switching valve is connected to the oil reservoir. The control method further includes controlling the fourth switching valve to connect the oil reservoir and the second switching valve.

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