Control valve for brake system, control valve assembly with control valve and brake system

Abstract

The invention relates to the field of electric control braking, in particular to a control valve for a braking system, a control valve assembly with the control valve and the braking system. The valve body assembly comprises a valve body, and the valve body comprises a valve seat and a sealing seat; the valve body is provided with a flow channel. The flow channel is a stepped channel; through the design of the stepped flow channel, when a booster pump system pressurizes a brake master cylinder and brake fluid flows through the stepped flow channel, due to sudden channel size change, the oil fluid entering the control valve cannot directly and smoothly flow out and can be accumulated in a main flow channel to form a stable pressure difference; subsequent pressure difference can be acquired through a pressure sensor in the brake system, and then in subsequent use, the sealing performance of the brake master cylinder or the brake system is judged according to the pressure value corresponding to the pressure difference P at the specified push speed V.

Description

Technical Field

[0001] The invention relates to the field of electric control braking, in particular to a control valve for a braking system and a control valve assembly and a braking system of the control valve. Background Art

[0002] In the existing automotive wire control system solutions,

[0003] An electromagnetic valve is arranged between the brake master cylinder and the fluid reservoir to connect or disconnect the brake master cylinder and the fluid reservoir, thereby realizing the self-checking function of the brake-by-wire system and the fluid replenishing function of the brake master cylinder.

[0004] For example, the content disclosed in patent application CN110906016A is known.

[0005] In the prior art, when performing self-check in the wire control brake system, the solenoid valve is powered on and closed, and the booster pump system increases the pressure in the brake master cylinder. The sealing is determined by the pressure drop signal of the brake master cylinder pressure sensor, thereby realizing the system self-check function.

[0006] That is, in the prior art, when performing a brake system sealing test, it is necessary to energize and close the solenoid valve to cut off the passage between the master cylinder and the fluid storage tank, thereby realizing a self-test function.

[0007] Such self-test also requires an electrically driven solenoid valve to be implemented, which means that the coil and the supporting software driver need to work together, which has a complex structure and higher cost.

[0008] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the structure of the existing control valve. Summary of the invention

[0009] The object of the present invention is to provide a control valve structure which does not require electric drive and can measure the sealing performance of a brake system by only utilizing the characteristic of valve throttling to generate a pressure difference.

[0010] In order to achieve the above object, the technical solution adopted by the present invention is:

[0011] A control valve for a brake system, comprising a valve body assembly; the valve body assembly comprises a valve body, and the valve body comprises a valve seat and a sealing seat;

[0012] The valve body is provided with a flow channel;

[0013] The flow channel is a stepped channel; when a specified flow flows through the flow channel, a stable pressure difference can be formed in the flow channel; and the sealing performance of the brake system is determined by detecting the pressure difference in the control valve.

[0014] The flow channel comprises a main flow channel arranged on the sealing seat and an outflow channel arranged on the valve seat; the main flow channel and / or the outflow channel are stepped channels.

[0015] The outflow channel includes a plug-in channel, a first channel and a second channel; the inner diameter of the first channel is smaller than the inner diameter of the second channel; the plug-in channel is connected to the second channel through the first channel; the first channel is connected to the mainstream channel on the sealing seat.

[0016] At least one end of the second channel passes through the valve seat and is communicated with the valve block channel.

[0017] The main flow channel comprises a plurality of sections of monomer channels; the sizes of adjacent monomer channels are the same or different, and the inner diameter of at least one section of the monomer channel is smaller than the inner diameter of its adjacent monomer channel.

[0018] The valve seat and the sealing seat are designed in a split type; the sealing seat is plugged into the valve seat.

[0019] The sealing seat is also provided with a one-way valve structure, which includes an auxiliary channel arranged on the sealing seat, and the auxiliary channel is also connected to the valve block channel; a closing element is arranged in the auxiliary channel; the closing element can control the opening and closing of the auxiliary channel.

[0020] The main channel is distributed at the center of the sealing seat; the auxiliary channels are distributed in parallel with the main channel at intervals.

[0021] The auxiliary channel includes an upper connecting channel and a lower connecting channel, the lower connecting channel is connected to the valve block channel through the upper connecting channel; the lower connecting channel is a frustum-shaped channel; the smaller opening end of the lower connecting channel is arranged close to the upper connecting channel; the closing element is a valve ball; the diameter of the valve ball is larger than the smallest inner diameter of the lower connecting channel and smaller than the largest inner diameter of the lower connecting channel.

[0022] A control valve assembly comprises a valve block, on which the control valve is arranged; a flow channel in the control valve is communicated with a valve block channel on the valve block.

[0023] A brake system comprises a booster system, a brake master cylinder and a fluid storage tank; the brake master cylinder is connected to the fluid storage tank via the control valve assembly;

[0024] During the self-inspection of the brake system: the booster system increases the pressure in the brake master cylinder by setting the pushing speed; the brake oil enters the valve block channel through the flow channel in the control valve; when the brake oil flows through the flow channel; the brake oil will accumulate in the flow channel to form a stable pressure difference, which is collected by the pressure sensor connected to the brake master cylinder; the sealing of the brake system is determined according to the pressure value corresponding to the pressure difference under the set pushing speed.

[0025] The advantages of the present invention are:

[0026] The invention discloses a control valve for a brake system and specifically a control valve assembly and a brake system of the control valve.

[0027] The present invention adopts a stepped flow channel design. When the booster pump system boosts the pressure to the brake master cylinder, when the brake fluid flows through the stepped flow channel, due to the sudden change in channel size, the oil entering the control valve cannot flow out directly and smoothly, and will accumulate in the mainstream channel to form a stable pressure difference. The pressure difference can be subsequently collected by a pressure sensor in the brake system, and then in subsequent use, the sealing of the brake master cylinder or the brake system is determined according to the pressure value corresponding to the pressure difference △P at a specified push speed V. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0029] Figure 1 It is a schematic diagram of the structure of the control valve of the present invention adopting the first structure;

[0030] Figure 2 It is a schematic diagram of the structure of the control valve of the present invention adopting the second structure;

[0031] Figure 3 It is a structural schematic diagram of the third structure adopted by the control valve of the present invention;

[0032] Figure 4 It is a schematic diagram of the oil flow direction during the self-test of the control valve of the present invention;

[0033] Figure 5 It is a schematic diagram of the oil flow direction during pressure relief and fluid replenishment of the control valve of the present invention.

[0034] Figure 6 It is a structural schematic diagram of the braking system in the present invention;

[0035] The marks in the above figure are:

[0036] 1. Closing element, 2. Side filter, 3. Valve seat, 301. Flow channel, 302. Valve seat body, 31. First channel, 32. Second channel, 33. Plug-in channel, 4. Sealing seat, 41. Main channel, 42. Auxiliary channel, 5. Bottom filter.

[0037] 101. Control valve, 102. Oil storage tank, 103. Brake master cylinder, 104. Pressurization system, 105. Pressure sensor. DETAILED DESCRIPTION

[0038] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0039] A control valve for a brake system, comprising a valve body assembly; the valve body assembly comprises a valve body main body 302, the valve body main body 302 comprises a valve seat 3 and a sealing seat 4; a flow channel 301 is provided on the valve body main body 302; the flow channel 301 is a stepped channel; the present invention adopts a stepped flow channel 301 design, when the booster pump system pressurizes the brake master cylinder 103, when the brake fluid flows through the stepped flow channel 301, due to the sudden change in the channel size, the oil entering the control valve 101 cannot flow out directly and smoothly, and will accumulate in the mainstream channel 41 to form a stable pressure difference, which can be collected by the brake master cylinder 103 and / or the pressure sensor 105 in the brake system, and then in subsequent use, the sealing of the brake master cylinder 103 and / or the brake system can be determined according to the pressure value corresponding to the pressure difference △P at a specified push speed V.

[0040] It should be noted that the arrangement and layout of the pressure sensor of the present invention can be designed as needed. The basic principle of the present invention is to use existing

[0041] The control valve 101 disclosed in the present invention is mainly used in a braking system.

[0042] Specifically, the control valve 101 disclosed in the present invention mainly includes a valve body assembly; the valve body assembly includes a valve body main body 302, and the valve body main body 302 is the main structure for on-off control of the control valve 101. In the present invention, the valve body main body 302 includes a valve seat 3 and a sealing seat 4; the flow channel 301 is arranged on the valve seat 3 and the sealing seat 4.

[0043] In the present invention, a flow channel 301 is provided on the valve body 302; the flow channel 301 is provided, and its basic function is to facilitate the supply and return of oil, thereby facilitating the flow control of oil in the brake system.

[0044] In addition, the flow channel 301 described in the present invention is a stepped channel; the present invention adopts a stepped channel design so that the inner diameter of the flow channel 301 is variable. In actual design, it is generally required that the inner diameter of the flow channel 301 on the side close to the valve block channel 34 is larger than the inner diameter of the flow channel 301 on the side away from the valve block channel 34. With such a setting, when the booster pump system pressurizes the brake master cylinder 103, when the brake fluid flows through the stepped flow channel 301, due to the sudden change in the channel size, the oil entering the control valve 101 cannot flow out directly and smoothly, and will accumulate in the mainstream channel 41 to form a stable pressure difference. Subsequently, the pressure difference can be collected by the brake master cylinder 103 and / or the pressure sensor 105 in the brake system. Then, in subsequent use, the sealing performance of the brake master cylinder 103 and / or the brake system is determined according to the pressure value corresponding to the pressure difference △P at the specified push speed V.

[0045] In the present invention, the flow channel 301 includes a mainstream channel 41 arranged on the sealing seat 4 and an outflow channel 3-1 arranged on the valve seat 3; the mainstream channel 41 is used for the reciprocating flow of oil between the valve seat 3 assembly and the brake master cylinder 103, and the outflow channel 3-1 is used for the reciprocating flow of oil between the valve seat 3 assembly and the oil storage tank; in the present invention, the mainstream channel 41 and / or the outflow channel 3-1 are stepped channels; that is, the flow channel 301 of the present invention is a stepped channel, and the step section can be in the mainstream channel 41 and / or the outflow channel 3-1. Based on the above, it can be known that the mainstream channel 41 and the outflow channel 3-1 of the present invention can have the following implementation scheme.

[0046] Implementation plan 1:

[0047] In the present invention, the outflow channel 3-1 includes a plug-in channel 33, a first channel 31 and a second channel 32; the plug-in channel 33 is connected to the second channel 32 through the first channel 31; the first channel 31 is connected to the mainstream channel 41 on the sealing seat 4; in the present invention, the plug-in channel 33 plays a basic connection role, which is convenient for the plug-in installation of the sealing seat 4 on the valve seat 3 in subsequent use; and, in the present invention, the outflow channel 3-1 includes a plug-in channel 33, a first channel 31 and a second channel 32; such a setting makes the outflow channel 3-1 designed as a three-section structure, the plug-in channel 33 is used to connect the mainstream channel 41, the plug-in channel 31 is used to connect the mainstream channel 41, and the plug-in channel 31 is used to connect the mainstream channel 41. The channel 33 is connected to the first channel 31, the first channel 31 is connected to the second channel 32, and the second channel 32 is connected to the valve block channel 34. Based on this arrangement, the reciprocating flow of oil between the valve seat assembly and the oil storage tank is facilitated; at the same time, in the present invention, the inner diameter of the first channel 31 is smaller than the inner diameter of the second channel 32; such an arrangement forms a stepped platform at the connection between the first channel 31 and the second channel 32. Based on such an arrangement, when the brake oil flows through the above-mentioned step, it will accumulate at the end of the mainstream channel 41 to form a stable pressure difference △P, and the pressure difference △P can be collected by the brake master cylinder 103 or / and the pressure sensor 105 in the brake system. The sealing of the brake system is determined according to the pressure value corresponding to the pressure difference △P at the specified push speed V.

[0048] Implementation Plan 2:

[0049] In the present invention, the mainstream channel 41 includes multiple sections of monomer channels 411; the sizes of adjacent monomer channels 411 are the same or different, and the inner diameter of at least one section of the monomer channel 411 is smaller than the inner diameter of its adjacent monomer channel 411; based on such a setting, it can be known that the mainstream channel 41 disclosed in the present invention is composed of multiple sections of monomer channels 411 coaxially arranged and connected in sequence, where the size of each monomer channel 411 is designed according to needs, and the specific length and the size of the inner diameter are also designed according to actual needs; but the basic requirement is that the inner diameter of at least one section of the monomer channel 411 is smaller than the inner diameter of its adjacent monomer channel 411. Such a setting can form a stepped structure inside the mainstream channel 41 itself; and then the oil flowing through here cannot flow out smoothly and directly due to the change in the inner diameter of the channel, so a pressure difference △P can also be formed; it is convenient for subsequent auxiliary identification of the sealing of the brake master cylinder 103 or the brake system.

[0050] In summary, we can know that

[0051] In order to achieve a pressure difference when the brake oil flows, it is necessary to change the inner diameter of the flow channel 301. Based on the change in the inner diameter, the flow rate is changed, and a pressure difference △P is formed at the point where the inner diameter changes. The size of the pressure difference △P is used to determine whether the brake master cylinder 103 is well sealed.

[0052] Embodiment 1:

[0053] The mainstream channel 41 is a straight-cylindrical channel structure, and the outflow channel 3-1 is designed to include a plug-in channel 33, a first channel 31 and a second channel 32; and the inner diameter of the first channel 31 is smaller than the inner diameter of the second channel 32, and the plug-in channel 33 is connected to the second channel 32 through the first channel 31; in this way, a stepped groove is formed in the outflow channel 3-1.

[0054] Embodiment 2;

[0055] The plug-in channel 33 and the first channel 31 in the outflow channel 3-1 are merged into one channel; that is, the plug-in channel 33 and the first channel 31 have the same inner diameter and are coaxially distributed. In essence, the plug-in channel 33 and the first channel 31 form an integral channel structure.

[0056] The main flow channel 41 includes three sections of monomer channels 411 , and the inner diameter of the monomer channels 411 in the middle area is smaller than the inner diameter of the adjacent monomer channels 411 ; thus, a stepped groove is formed in the main flow channel 41 .

[0057] Embodiment 3:

[0058] Both the main flow channel 41 and the outflow channel can be designed as the above-mentioned stepped channel structure.

[0059] Furthermore, in the present invention, at least one end of the second channel 32 passes through the valve seat 3 and is connected to the valve block channel 34; in the present invention, based on the above design, the basic function of the second channel 32 is to play a connecting role to facilitate the subsequent flow of oil between the valve seat 3 and the valve block channel 34.

[0060] At the same time, in the present invention, at least one end of the second channel 32 passes through the valve seat 3 and is connected to the valve block channel 34, which makes the second channel 32 have the following implementation scheme:

[0061] Solution 1: One end of the second channel 32 extends to the outside of the valve seat 3 , and the other end is connected to the first channel 31 . In other words, the second channel 32 is only provided through one side of the valve seat 3 .

[0062] Solution 2: Both ends of the second channel 32 extend toward the outside of the valve seat 3; the middle area of ​​the second channel 32 is connected to the main channel 41 or the first channel 31; such a design can facilitate rapid reflux of oil pressure relief.

[0063] Furthermore, in the present invention, the valve seat 3 and the sealing seat 4 are designed to be split; the sealing seat 4 is plugged into the valve seat 3; in actual arrangement, the sealing seat 4 is plugged into the lower end of the valve seat 3, and the upper end surface of the sealing seat 4 is fitted with the lower end surface of the valve seat 3. Such an arrangement can realize the separate processing of the valve seat 3 and the sealing seat 4, and in actual use, the sealing seat 4 can be a plastic part or a metal part. When the sealing seat is a plastic part, the sealing seat can be injection molded by an injection molding process. When the sealing seat is a metal part, the sealing seat can be made of metal material, and in order to ensure strength, the sealing seat 4 made of metal material can also be heat-treated and hardened; extending the service life of the sealing seat 4.

[0064] Furthermore, in the present invention, a one-way valve structure is also provided on the sealing seat 4, and the one-way valve structure includes an auxiliary channel 42 arranged on the sealing seat 4, and the auxiliary channel 42 is also connected to the valve block channel 34; a closing element 1 is arranged in the auxiliary channel 42; the closing element 1 can control the on-off of the auxiliary channel 42; the present invention sets a one-way valve structure, when pressurized, the closing element 1 moves into the auxiliary channel 42 under the action of the brake oil pressure, and the inner wall of the auxiliary channel 42 and the closing element 1 form a sealing pair, thereby realizing the closure of the auxiliary channel 42, and the oil enters the valve body assembly through the mainstream channel 41, and enters the valve block channel 34 through the valve body assembly for subsequent operations; and when the brake pedal is reset, the pedal is withdrawn faster, and the oil in the reservoir needs to be quickly returned to the brake master cylinder circuit. At this time, under the action of the pressure relief oil; the closing element 1 is separated from the inner wall of the auxiliary channel 42, and at this time, the mainstream channel 41 and the auxiliary channel 42 can both be used as pressure relief channels, thereby realizing the fluid replenishment demand of the brake master cylinder 103.

[0065] Furthermore, in the present invention, the mainstream channel 41 is distributed at the center of the sealing seat 4; the auxiliary channel 42 is distributed in parallel with the mainstream channel 41 at intervals; in the present invention, because the mainstream channel 41 needs to take on the role of oil inlet and outlet during actual use, it is used more frequently and is centrally set to reduce the oil flow path and optimize the response speed; and the auxiliary channel 42 is mainly implemented under the pressure relief state, so it can be set offset.

[0066] In the present invention, the auxiliary channel 42 includes an upper connecting channel 422 and a lower connecting channel 421, and the lower connecting channel 421 is connected to the valve block channel 34 through the upper connecting channel 422; in the present invention, the upper connecting channel 422 can be designed to be a cone or a cylinder, and of course it is also possible to set it to other structures. In the present invention, the lower connecting channel 421 is a cone-shaped channel; the smaller opening end of the lower connecting channel 421 is arranged close to the upper connecting channel 422; the closing element 1 is a valve ball; the diameter of the valve ball is larger than the smallest inner diameter of the lower connecting channel 421, and smaller than the largest inner diameter of the lower connecting channel 421; the valve ball can be a steel ball or other metal balls; of course it can also be a spherical structure made of plastic material; and the lower connecting channel 421 is designed as a cone-shaped channel, which is convenient for the valve ball and the lower connecting channel 421 to be used in combination.

[0067] A control valve assembly includes a valve block, on which the control valve 101 is provided; a flow channel 301 in the control valve 101 is connected to a valve block channel 34 on the valve block; a sealing seat 4 in the control valve 101 is connected to a bottom filter screen 5 on a side away from the valve block; the arrangement of the valve block facilitates the installation and arrangement of the control valve 101. The control valve assembly 101 disclosed in the present invention has a special design of its own flow channel 301, that is, a stepped design of the flow channel 301. When the booster pump system pressurizes the brake master cylinder 103, when the brake fluid flows through the stepped flow channel 301, due to the sudden change in the channel size, the oil entering the control valve 101 cannot flow out directly and smoothly, and will accumulate in the mainstream channel 41 to form a stable pressure difference. The pressure difference can be subsequently collected by the brake master cylinder 103 or / and the pressure sensor 105 in the brake system, and then in subsequent use, the sealing of the brake master cylinder 103 or the brake system is determined according to the pressure value corresponding to the pressure difference △P at the specified push speed V.

[0068] In the present invention, the valve block channel is a channel structure provided on the valve block, which is mainly used to facilitate the flow of oil through the valve block and facilitate the subsequent coordinated flow channel to realize the flow of oil in the control valve; the side filter 2 is arranged in the valve block channel.

[0069] A braking system, comprising a pressure boosting system 104, a brake master cylinder 103 and a fluid reservoir 102; the brake master cylinder 103 is connected to the fluid reservoir 102 via the control valve 101 assembly; during the self-check of the braking system: the pressure boosting system 104 increases the pressure in the brake master cylinder 103 by setting a pushing speed; the brake oil enters the valve block channel 34 through the flow channel in the control valve 101; when the brake oil flows through the flow channel; the brake oil accumulates in the flow channel to form a stable pressure difference, which is collected by the pressure sensor 105 connected to the brake master cylinder 103 or the braking system; the pressure is lowered according to the set pushing speed The pressure value corresponding to the force difference is used to determine the sealing performance of the brake master cylinder 103 or the brake system; when the booster pump system pressurizes the brake master cylinder 103, when the brake fluid flows through the stepped flow channel 301, due to the sudden change in the channel size, the oil entering the control valve 101 cannot flow out directly and smoothly, and will accumulate in the mainstream channel 41 to form a stable pressure difference. The pressure difference can be subsequently collected by the brake master cylinder 103 and / or the pressure sensor 105 in the brake system, and then in subsequent use, the sealing performance of the brake master cylinder 103 or the brake system is determined according to the pressure value corresponding to the pressure difference △P at the specified pushing speed V.

[0070] The boosting system 104 disclosed in the present invention is essentially a boosting pump system.

[0071] In addition, the pressure difference here mainly refers to the pressure difference between the hydraulic pressure in the plug-in channel and the hydraulic pressure in the second channel.

[0072] specific:

[0073] The invention discloses a control valve structure for a brake system, which mainly comprises a closing element 1, a side filter screen 2, a valve seat 3, a sealing seat 4 and a bottom filter screen 5.

[0074] The sealing seat 4 and the bottom filter screen 5 are fixed by mechanical connection, and the closing element 1 is arranged between the sealing seat 4 and the bottom filter screen 5; the sealing seat 4 is provided with two channels, namely a main channel 41 and an auxiliary channel 42.

[0075] The sealing seat 4 and the valve seat 3 are fixed by mechanical connection. In the present invention, the mainstream channel 41 on the sealing seat 4 or the outflow channel 3-1 on the valve seat 3 is designed to be a stepped groove structure, which makes the valve seat 3 body have a channel structure with a changing cross-section. In this way, when used subsequently, a stable hydraulic pressure difference can be output when the boost system 104 provides a specified flow rate. The sealing performance of the brake system or the brake master cylinder 103 is determined by the stable hydraulic pressure difference, thereby achieving the goal of self-inspection of the brake system.

[0076] In the present invention, the outflow channel 3 - 1 includes a plug-in channel 33 , a first channel 31 and a second channel 32 ; in the present invention, the second channel 32 can be set to different channel diameters and different channel quantities according to requirements.

[0077] When the auxiliary channel 42 of the sealing seat 4 described in the present invention is subjected to the oil pressure entering from the bottom filter 5 end, the closing element 1 moves toward the valve seat 3 to form a sealing pair with the auxiliary channel 42, so that the auxiliary channel 42 is in a closed and sealed state.

[0078] The auxiliary channel 42 is opened to provide a larger oil passage, and when the driver pulls back the pedal to reset it, the oil lost by the brake master cylinder 103 can be quickly replenished.

[0079] During the self-inspection of the brake system, the booster pump system boosts the brake master cylinder 103 at a specified push speed V, and the closing element 1 in the brake system detection valve moves toward the valve seat 3 under the brake fluid pressure, forming a closed sealing pair with the auxiliary channel 42, and the auxiliary channel 42 is closed; when the brake fluid passes through the small inner diameter position of the flow channel 301, the channel has a small inner diameter, and the oil cannot flow out directly and smoothly, and will accumulate in the flow channel 301 to form a stable pressure difference △P. The pressure difference △P can be collected by the brake master cylinder 103 and / or the pressure sensor 105 in the brake system.

[0080] The sealing performance of the brake master cylinder 103 or the brake system is determined according to the pressure value corresponding to the pressure difference ΔP at the specified pushing speed V.

[0081] When the vehicle is driving normally and the driver pushes back the pedal to reset it, the brake master cylinder 103 is required to quickly replenish oil from the reservoir 102 when the pedal is pulled back quickly. At this time, the auxiliary channel 42 is opened, and oil can be supplied from the main channel 41 and the auxiliary channel 42 at the same time to meet the brake master cylinder 103's replenishment demand.

[0082] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A control valve for a brake system, characterized in that: It comprises a valve body assembly; the valve body assembly comprises a valve body (302), and the valve body (302) comprises a valve seat (3) and a sealing seat (4); The valve body (302) is provided with a flow channel (301); The flow channel (301) is a stepped channel; When a specified flow rate flows through the flow channel (301), a stable pressure difference can be formed in the flow channel (301); The sealing of the brake system is determined by detecting the pressure difference in the control valve.

2. A control valve for a brake system according to claim 1, characterized in that: The flow channel (301) comprises a main flow channel (41) arranged on the sealing seat (4) and an outflow channel arranged on the valve seat (3); the main flow channel (41) and / or the outflow channel are stepped channels.

3. A control valve for a brake system according to claim 2, characterized in that: The outflow channel comprises a plug-in channel (33), a first channel (31) and a second channel (32); the inner diameter of the first channel (31) is smaller than the inner diameter of the second channel (32); the plug-in channel (33) is connected to the second channel (32) via the first channel (31); and the first channel (31) is connected to the main flow channel (41) on the sealing seat (4).

4. A control valve for a brake system according to claim 3, characterized in that: At least one end of the second channel (32) passes through the valve seat (3) and is connected to the valve block channel (34).

5. A control valve for a brake system according to any one of claims 1 to 4, characterized in that: The main flow channel (41) comprises a plurality of sections of monomer channels (411); the sizes of adjacent monomer channels (411) are the same or different, and the inner diameter of at least one section of the monomer channel (411) is smaller than the inner diameter of its adjacent monomer channel (411).

6. A control valve for a brake system according to any one of claims 1 to 4, characterized in that: The valve seat (3) and the sealing seat (4) are of split design; the sealing seat (4) is plugged into the valve seat (3).

7. A control valve for a brake system according to any one of claims 1 to 4, characterized in that: The sealing seat (4) is also provided with a one-way valve structure, the one-way valve structure comprising an auxiliary channel (42) arranged on the sealing seat (4), the auxiliary channel (42) also being connected to the valve block channel (34); a closing element (1) is arranged in the auxiliary channel (42); the closing element (1) is capable of controlling the opening and closing of the auxiliary channel (42).

8. A control valve for a brake system according to claim 7, characterized in that: The main channel (41) is distributed at the center of the sealing seat (4); the auxiliary channel (42) and the main channel (41) are distributed in parallel with each other at intervals.

9. A control valve for a brake system according to claim 7, characterized in that; The auxiliary channel (42) comprises an upper connecting channel (422) and a lower connecting channel (421); the lower connecting channel (421) is connected to the valve block channel (34) through the upper connecting channel (422); the lower connecting channel (421) is a frustum-shaped channel; the smaller opening end of the lower connecting channel (421) is arranged close to the upper connecting channel (422); the closing element (1) is a valve ball; the diameter of the valve ball is larger than the smallest inner diameter of the lower connecting channel (421) and smaller than the largest inner diameter of the lower connecting channel (421).

10. A control valve assembly, characterized in that: It comprises a valve block, on which is provided a control valve as claimed in any one of claims 1 to 9; a flow channel (301) in the control valve is connected to a valve block channel (34) on the valve block.

11. A braking system, characterized in that: It comprises a booster system (104), a brake master cylinder (103) and a fluid reservoir (102); the brake master cylinder (103) is connected to the fluid reservoir (102) via the control valve assembly as claimed in claim 10; During the self-inspection of the brake system: the boosting system (104) increases the pressure in the brake master cylinder (103) by setting the pushing speed; the brake oil enters the valve block channel (34) through the flow channel (301) in the control valve; when the brake oil flows through the flow channel (301); the brake oil accumulates in the flow channel (301) to form a stable pressure difference, and the pressure difference is collected by the pressure sensor connected to the brake master cylinder (103); the sealing of the brake system is determined according to the pressure value corresponding to the pressure difference at the set pushing speed.

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