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

Abstract

The utility model 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 size change of the channel, 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 utility model relates to the field of electric control brake, specifically a control valve for brake system and the control valve assembly and brake system of specific control valve. BACKGROUND

[0002] In the existing automobile line control brake system scheme,

[0003] An electromagnetic valve is arranged between the brake master cylinder and the liquid storage tank, which is used for connecting or isolating the brake master cylinder and the liquid storage tank, and realizes the self-checking function of the line control brake system and the liquid supplement function of the brake master cylinder.

[0004] For example, the known patent application CN110906016A discloses the content.

[0005] When the existing technology performs self-checking on the line control brake system, the electromagnetic valve is powered off, the booster pump system pressurizes the brake master cylinder, and the sealing property is judged through the pressure drop signal of the brake master cylinder pressure sensor, so that the system self-checking function is realized.

[0006] That is, in the prior art, when the sealing property of the brake system is detected, the electromagnetic valve needs to be powered off to cut off the channel between the master cylinder and the liquid storage tank, so as to realize the self-checking function.

[0007] Therefore, the self-checking also needs to be realized by electrically driving the electromagnetic valve, that is, the coil and the matching software driving need to work together, the structure is complex, and the cost is higher.

[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. INVENTION CONTENTS

[0009] The utility model aims at providing a control valve structure which does not need electric driving and only uses the pressure difference generated by valve throttling to determine the sealing property of the brake system.

[0010] In order to realize the above purpose, the utility model adopts the technical scheme that:

[0011] A control valve for brake system, comprising a valve body assembly, wherein 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, and when the specified flow passes through the flow channel, a stable pressure difference can be formed in the flow channel; the sealing property 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 outer flow channel arranged on the valve seat; the main flow channel or / and the outer flow channel is a stepped channel.

[0015] The outer flow channel comprises a plug channel, a first channel and a second channel; the inner diameter of the first channel is smaller than that of the second channel; the plug channel is connected with the first channel and the second channel; the first channel is connected with the main flow channel on the sealing seat.

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

[0017] The main flow channel comprises a plurality of single channels; adjacent single channels have the same or different sizes; at least one single channel has an inner diameter smaller than that of its adjacent single channel.

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

[0019] The sealing seat is further provided with a one-way valve structure; the one-way valve structure comprises an auxiliary channel arranged on the sealing seat; the auxiliary channel is also connected with 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 flow channel is distributed at the center position of the sealing seat; the auxiliary channel is distributed in parallel with the main flow channel at intervals.

[0021] The auxiliary channel comprises an upper connecting channel and a lower connecting channel; the lower connecting channel is connected with the valve block channel through the upper connecting channel; the lower connecting channel is a frustum 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 greater than the inner diameter of the smallest part of the lower connecting channel and smaller than the inner diameter of the largest part of the lower connecting channel.

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

[0023] A brake system comprises a booster system, a brake master cylinder and a liquid storage tank; the brake master cylinder is connected with the liquid storage tank through the control valve assembly.

[0024] When the brake system is self-checked, the booster system pressurizes the brake master cylinder by setting a pushing speed; 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 accumulates in the flow channel to form a stable pressure difference; the pressure difference is collected by a pressure sensor connected with the brake master cylinder; the pressure value corresponding to the pressure difference under the set pushing speed is used to determine the sealing property of the brake system.

[0025] The utility model discloses a kind of control valve for brake system and the control valve assembly and brake system of specific control valve.

[0026] The utility model discloses a kind of control valve for brake system and the control valve assembly and brake system of specific control valve.

[0027] The utility model discloses a kind of control valve for brake system and the control valve assembly and brake system of specific control valve. BRIEF DESCRIPTION OF DRAWINGS

[0028] The following is briefly described to the content expressed in each drawing of the utility model specification and the mark in drawing:

[0029] Figure 1 It is the structure schematic drawing of the utility model control valve using first structure;

[0030] Figure 2 It is the structure schematic drawing of the utility model control valve using second structure;

[0031] Figure 3 It is the structure schematic drawing of the utility model control valve using third structure;

[0032] Figure 4 It is the oil flow direction schematic drawing of the utility model control valve when self-checking;

[0033] Figure 5 It is the oil flow direction schematic drawing of the utility model control valve when pressure relief liquid supplement;

[0034] Figure 6 It is the structure schematic drawing of brake system in the utility model;

[0035] The mark in above-mentioned drawing is all:

[0036] 1, closed element, 2, side screen, 3, valve seat, 301, flow passage, 302 valve seat body, 31, first passage, 32, second passage, 33, plug-in passage, 4, sealing seat, 41, main flow passage, 42, auxiliary passage, 5, bottom screen.

[0037] 101, control valve, 102, oil storage tank, 103, brake master cylinder, 104, pressure boosting system, 105, pressure sensor. DETAILED DESCRIPTION

[0038] The specific embodiments of the present application will be further described in detail below with reference to the drawings.

[0039] The utility model discloses a control valve for brake system, including valve body assembly, the valve body assembly includes valve body 302, and the valve body 302 includes valve seat 3 and sealing seat 4, be equipped with flow channel 301 on the valve body 302, flow channel 301 is stepped channel, the utility model discloses a stepped flow channel 301 design, when the booster pump system pressurizes brake master cylinder 103, brake fluid flows through stepped flow channel 301, and the oil liquid that enters control valve 101 cannot directly flow out smoothly because of the sudden channel size change, will gather in main stream passage 41 and form stable pressure difference, and this pressure difference can be obtained through brake master cylinder 103 or pressure sensor 105 in brake system gathers, and then in subsequent use, according to the pressure value of pressure difference delta P corresponding under the specified push speed V to judge the leakproofness of brake master cylinder 103 or brake system.

[0040] Here, it needs to be explained that the setting and arrangement position of the pressure sensor of the utility model can be designed according to the need, and the basic principle of the utility model is to realize the pressure difference acquisition of brake master cylinder 103 or brake system through the existing pressure sensor 105.

[0041] The utility model discloses a control valve 101 mainly is used for brake system.

[0042] Specifically, the utility model discloses a control valve 101 mainly includes valve body assembly, the valve body assembly includes valve body 302, and the valve body 302 is the main structure of control valve 101 on-off control, and the valve body 302 includes valve seat 3 and sealing seat 4 in the utility model, and flow channel 301 is arranged on valve seat 3 and sealing seat 4.

[0043] The valve body 302 is equipped with flow channel 301 in the utility model, and the setting of flow channel 301 is convenient for the supply and backflow of oil liquid, thereby facilitating the flow control of oil liquid in brake system.

[0044] In addition, the flow channel 301 is a stepped channel in the utility model; the utility model designs the stepped channel, so that the inner diameter of the flow channel 301 is changeable, and in actual design, the inner diameter size of the flow channel 301 close to the valve block channel 34 is generally required to be greater than the inner diameter size of the flow channel 301 far from the valve block channel 34, and the setting can make the oil entering the control valve 101 not directly and smoothly flow out when the brake fluid flows through the stepped flow channel 301 when the booster pump system pressurizes the brake master cylinder 103, so that a stable pressure difference is accumulated in the main flow channel 41, and the subsequent pressure difference can be collected by the brake master cylinder 103 or / and the pressure sensor 105 in the brake system, and then in subsequent use, the sealing property of the brake master cylinder 103 or / and the brake system is determined according to the pressure value corresponding to the pressure difference ΔP under the specified push speed V.

[0045] The flow channel 301 includes the main flow channel 41 arranged on the sealing seat 4 and the outer flow channel 3-1 arranged on the valve seat 3 in the utility model, the main flow channel 41 is used for the reciprocating flow of the oil between the valve seat 3 assembly and the brake master cylinder 103, and the outer flow channel 3-1 is used for the reciprocating flow of the oil between the valve seat 3 assembly and the oil storage tank, and the main flow channel 41 or / and the outer flow channel 3-1 are stepped channels in the utility model, that is, the flow channel 301 of the utility model is a stepped channel, and the stepped section can be in the main flow channel 41 or / and the outer flow channel 3-1, and based on the above, it can be known that the main flow channel 41 and the outer flow channel 3-1 of the utility model can have the following implementation schemes.

[0046] Implementation scheme one:

[0047] The outer flow passage 3-1 includes the plug-in passage 33, the first passage 31 and the second passage 32; the plug-in passage 33 is communicated with the second passage 32 through the first passage 31; the first passage 31 is communicated with the main flow passage 41 on the sealing seat 4; in the utility model, the plug-in passage 33 plays a basic connecting role, facilitating the plug-in installation of the sealing seat 4 on the valve seat 3 in subsequent use; and in the utility model, the outer flow passage 3-1 includes the plug-in passage 33, the first passage 31 and the second passage 32; such a design makes the outer flow passage 3-1 into a three-section structure, the plug-in passage 33 is used for communicating the main flow passage 41, the plug-in passage 33 is connected with the first passage 31, the first passage 31 is communicated with the second passage 32, and the second passage 32 is communicated with the valve block passage 34; based on such a design, the reciprocating flow of the oil between the valve seat assembly and the oil storage tank is facilitated; meanwhile, in the utility model, the inner diameter of the first passage 31 is smaller than that of the second passage 32; such a design makes the first passage 31 and the second passage 32 form a stepped platform at the connection position, and based on such a design, when the brake oil flows through the stepped platform, a stable pressure difference ΔP is formed at the end of the main flow passage 41, and the pressure difference ΔP can be obtained by the brake master cylinder 103 or / and the pressure sensor 105 in the brake system. The sealing property of the brake system is determined according to the pressure value corresponding to the pressure difference ΔP under the specified pushing speed V.

[0048] Embodiment two:

[0049] In the utility model, the main flow passage 41 includes multiple single passages 411; adjacent single passages 411 are the same or different in size, and at least one single passage 411 has an inner diameter smaller than that of its adjacent single passage 411; based on such a design, it can be known that the main flow passage 41 disclosed in the utility model is coaxially arranged and sequentially connected by multiple single passages 411; here, the size of each single passage 411 is designed according to the requirement, and the specific length and the size of the inner diameter are also designed according to the actual requirement; but the basic requirement is that at least one single passage 411 has an inner diameter smaller than that of its adjacent single passage 411; such a design can make the main flow passage 41 form a stepped structure inside itself; and further can make the oil flowing through here unable to flow out smoothly and directly because of the change of the inner diameter of the passage, so as to form a pressure difference ΔP; facilitating the subsequent auxiliary identification of the sealing property of the brake master cylinder 103 or the brake system.

[0050] From the above, it can be known that;

[0051] In order to realize the pressure difference when the brake oil flows, it is necessary to change the inner diameter of the flow passage 301, based on the change of the inner diameter, so as to change the flow rate, and further form a pressure difference ΔP at the position where the inner diameter changes; and determine whether the brake master cylinder 103 is well sealed according to the size of the pressure difference ΔP.

[0052] Embodiment 1:

[0053] The main flow channel 41 is a straight cylinder type channel structure, the outer flow channel 3-1 is designed to include the plug-in channel 33, the first channel 31 and the second channel 32; and the inner diameter of the first channel 31 is smaller than that of the second channel 32, and the plug-in channel 33 is connected with the second channel 32 through the first channel 31; so that the stepped groove is formed in the outer flow channel 3-1.

[0054] Embodiment 2;

[0055] The plug-in channel 33 and the first channel 31 in the outer flow channel 3-1 are combined into one channel; that is, the inner diameters of the plug-in channel 33 and the first channel 31 are the same, and they are coaxially distributed, and 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 single channels 411, and the inner diameter of the single channel 411 in the middle region is smaller than that of the adjacent single channel 411; so that the stepped groove is formed in the main flow channel 41.

[0057] Embodiment 3:

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

[0059] Further, in the utility model, the second channel 32 is connected with the valve block channel 34 through the valve seat 3 at least at one end; in the utility model, based on the above design, the second channel 32 basically plays a connecting role, which facilitates the flow of oil between the valve seat 3 and the valve block channel 34.

[0060] Meanwhile, in the utility model, the second channel 32 is connected with the valve block channel 34 through the valve seat 3 at least at one end, which makes the second channel 32 have the following implementation scheme:

[0061] Scheme 1: one end of the second channel 32 extends to the outside of the valve seat 3, and the other end is connected with the first channel 31, in other words, the second channel 32 only penetrates one side of the valve seat 3.

[0062] Scheme 2: both ends of the second channel 32 extend to the outside of the valve seat 3; the middle region of the second channel 32 is connected with the main flow channel 41 or the first channel 31; such design can facilitate the rapid backflow of oil during pressure relief.

[0063] Further, in the utility model, the valve seat 3 and the sealing seat 4 adopt split type design, the sealing seat 4 is inserted on the valve seat 3, and the sealing seat 4 upper end face is pasted with the valve seat 3 lower end face when actually arranging, and the sealing seat 4 is inserted on the valve seat 3 lower end, and the sealing seat 4 upper end face is pasted with the valve seat 3 lower end face, and the setting can realize the valve seat 3 and the sealing seat 4 split machining, and when actually using, the sealing seat 4 can be plastic piece or metal piece, when the sealing seat is plastic piece, the sealing seat can be injection molded by injection molding process, when the sealing seat is metal piece, the sealing seat can be made of metal material, and in order to guarantee strength, the sealing seat 4 made of metal material can also be heat treated and hardened, prolong the service life of the sealing seat 4.

[0064] Further, in the utility model, the sealing seat 4 is also provided with one-way valve structure, the one-way valve structure includes the auxiliary channel 42 arranged on the sealing seat 4, the auxiliary channel 42 is also communicated with the valve block channel 34, the auxiliary channel 42 is arranged with the sealing element 1, the sealing element 1 can control the on-off of the auxiliary channel 42, the utility model is provided with one-way valve structure, when pressurizing, the sealing element 1 moves to the auxiliary channel 42 under the brake oil pressure, the auxiliary channel 42 inner wall and the sealing element 1 form a sealing pair, and then the auxiliary channel 42 is closed, the oil enters the valve body assembly through the main flow channel 41, and then enters the valve block channel 34 through the valve body assembly, and then is operated, when the brake pedal resets, the pedal is withdrawn quickly, and the oil in the liquid storage tank needs to return to the brake master cylinder circuit quickly, at this time, under the action of the pressure relief oil, the sealing element 1 and the auxiliary channel 42 inner wall are separated, the main flow channel 41 and the auxiliary channel 42 can be used as pressure relief channel, and then the brake master cylinder 103 replenishment demand is realized.

[0065] Further, in the utility model, the main flow channel 41 is distributed at the center position of the sealing seat 4, the auxiliary channel 42 and the main flow channel 41 are spaced apart and parallelly distributed, in the utility model, because the main flow channel 41 needs to bear the oil inletting and oil outletting in the actual use process, is used more frequently, is centrally arranged, can reduce the oil flow path, and the response speed is optimized, and the auxiliary channel 42 is mainly realized in the pressure relief state, so it can be offset.

[0066] The auxiliary passage 42 comprises an upper connecting passage 422 and a lower connecting passage 421, and the lower connecting passage 421 is communicated with the valve block passage 34 through the upper connecting passage 422; the upper connecting passage 422 can be designed as a frustum, a cylinder or other structures; the lower connecting passage 421 is a frustum passage; the smaller opening end of the lower connecting passage 421 is arranged close to the upper connecting passage 422; the closed element 1 is a valve ball; the diameter of the valve ball is greater than the minimum inner diameter of the lower connecting passage 421 and smaller than the maximum inner diameter of the lower connecting passage 421; the valve ball can be a steel ball or other metal ball; the valve ball can also be a plastic ball structure; and the lower connecting passage 421 is designed as a frustum passage, so that the valve ball and the lower connecting passage 421 can be conveniently used together.

[0067] A control valve assembly comprises a valve block, wherein the control valve 101 is arranged on the valve block; a flow passage 301 in the control valve 101 is communicated with a valve block passage 34 on the valve block; a sealing seat 4 in the control valve 101 is connected with a bottom filter screen 5 away from the valve block; the valve block facilitates the installation and arrangement of the control valve 101; the control valve 101 assembly disclosed in the utility model is specially designed through the flow passage 301, that is, the stepped design of the flow passage 301; when the booster pump system boosts the brake master cylinder 103, the brake fluid flows through the stepped flow passage 301; due to the sudden change of the passage size, the oil entering the control valve 101 cannot directly and smoothly flow out, and a stable pressure difference is formed in the main flow passage 41; the subsequent pressure difference can be collected by the brake master cylinder 103 or / and the pressure sensor 105 in the brake system, so that the sealing property of the brake master cylinder 103 or the brake system can be determined according to the pressure value corresponding to the pressure difference ΔP under the specified push speed V in subsequent use.

[0068] The valve block passage is a passage structure arranged on the valve block, which is mainly used for facilitating the flow of oil through the valve block and facilitating the flow of oil in the control valve through cooperation with the flow passage; the side filter screen 2 is arranged in the valve block passage.

[0069] A kind of brake system, including booster system 104, brake master cylinder 103 and liquid reservoir 102;The brake master cylinder 103 is connected with liquid reservoir 102 by the control valve 101 assembly;When brake system self-inspection: booster system 104 is pressurized in brake master cylinder 103 by setting push speed;Brake oil enters valve block passage 34 in flow channel in control valve 101;When brake oil flows through flow channel;Brake oil can form stable pressure difference in flow channel, and the pressure difference is obtained by pressure sensor 105 of brake master cylinder 103 or brake system connection;According to the pressure value corresponding to pressure difference under set push speed, the sealing of brake master cylinder 103 or brake system is judged;When booster pump system pressurizes brake master cylinder 103, brake liquid flows through stepped flow channel 301, due to the sudden change of channel size, the oil entering control valve 101 cannot directly and smoothly flow out, and stable pressure difference is formed in main flow passage 41, and the subsequent pressure difference can be obtained by pressure sensor 105 in brake master cylinder 103 or / and brake system, and then in subsequent use, according to the pressure value corresponding to pressure difference ΔP under specified push speed V, the sealing of brake master cylinder 103 or brake system is judged.

[0070] The booster system 104 disclosed in the utility model is essentially a booster pump system.

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

[0072] Specifically:

[0073] The utility model discloses a control valve structure for brake system mainly includes closed element 1, side screen 2, valve seat 3, sealing seat 4 and bottom screen 5.

[0074] Sealing seat 4 and bottom screen 5 are fixed by mechanical connection, and the closed element 1 is arranged between sealing seat 4 and bottom screen 5;Sealing seat 4 is provided with two passages, and is main flow passage 41 and auxiliary passage 42 respectively.

[0075] Sealing seat 4 and valve seat 3 are fixed by mechanical connection, and the main flow passage 41 on sealing seat 4 or the outer flow passage 3-1 on valve seat 3 is designed as a stepped groove structure in the utility model, which makes the valve seat 3 have a channel structure with varying cross section, so that stable hydraulic pressure difference can be output when the booster system 104 provides specified flow in subsequent use, and the sealing of brake system or brake master cylinder 103 is judged by the stable hydraulic pressure difference, so that the goal of brake system self-inspection is realized.

[0076] In the utility model, the outer flow channel 3-1 includes the plug-in channel 33, the first channel 31 and the second channel 32; in the utility model, the second channel 32 can set different channel diameter sizes and different channel numbers according to requirements.

[0077] In the utility model, when the auxiliary channel 42 of the sealing seat 4 is subjected to the oil hydraulic pressure from the bottom filter screen 5 end, the sealing element 1 moves to the valve seat 3 direction, forms a sealing pair with the auxiliary channel 42, and makes the auxiliary channel 42 in a closed sealing state.

[0078] The auxiliary channel 42 opening provides a larger oil passage, and when the driver resets the pedal, the lost oil of the brake master cylinder 103 can be quickly supplemented.

[0079] When the brake system is self-checked, the booster pump system pressurizes the brake master cylinder 103 through the specified push speed V, the sealing element 1 in the brake system detection valve moves to the valve seat 3 direction under the brake hydraulic pressure, forms 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 flow channel 301 has a small channel inner diameter, and the oil cannot flow out smoothly and directly, and a stable pressure difference ΔP is formed in the flow channel 301, and the pressure difference ΔP can be obtained by the brake master cylinder 103 or / and the pressure sensor 105 in the brake system.

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

[0081] In normal driving of the vehicle, when the driver resets the pedal, if the pedal is reset quickly and the brake master cylinder 103 needs to be supplemented with oil from the liquid tank 102 quickly, at this time, the auxiliary channel 42 is opened, and oil can be supplied from the main flow channel 41 and the auxiliary channel 42 at the same time, so that the liquid supplementing requirement of the brake master cylinder 103 is met.

[0082] Obviously, the specific implementation of the utility model is not limited by the above mode, and various non-essential improvements adopting the method concept and technical scheme of the utility model are within the protection scope of the utility model.

Claims

1. A control valve for a brake system, characterized by, The valve body assembly comprises a valve body (302) including a valve seat (3) and a sealing seat (4); The valve body (302) is provided with a flow passage (301); The flow passage (301) is a stepped passage; A stable pressure difference can be formed in the flow passage (301) when a specified flow passes through the flow passage (301); The sealing property of the brake system is determined by detecting the pressure difference in the control valve.

2. The control valve for a brake system according to claim 1, characterized by The flow passage (301) comprises a main flow passage (41) arranged on the sealing seat (4) and an outer flow passage arranged on the valve seat (3); the main flow passage (41) and / or the outer flow passage are stepped passages.

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

4. The control valve for a brake system according to claim 3, characterized by At least one end of the second passage (32) penetrates through the valve seat (3) and is connected with a valve block passage (34).

5. A control valve for a brake system according to any one of claims 2 to 4, characterised in that, The main flow passage (41) comprises a plurality of single passages (411); adjacent single passages (411) are of the same size or different sizes, and at least one single passage (411) has an inner diameter smaller than that of its adjacent single passage (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 designed in a split type; the sealing seat (4) is plugged on the valve seat (3).

7. A control valve for a brake system according to any one of claims 2 to 4, characterized in that The sealing seat (4) is further provided with a one-way valve structure, which comprises an auxiliary passage (42) arranged on the sealing seat (4); the auxiliary passage (42) is also connected with the valve block passage (34); a closing element (1) is arranged in the auxiliary passage (42); the closing element (1) can control the opening and closing of the auxiliary passage (42).

8. The control valve for a brake system according to claim 7, characterized by The main flow passage (41) is distributed at the center position of the sealing seat (4); the auxiliary passage (42) is distributed in parallel with the main flow passage (41) at intervals.

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

10. A control valve assembly characterized by, The valve block is provided with the control valve according to any one of claims 1-9; the flow passage (301) in the control valve is connected with the valve block passage (34) on the valve block.

11. A brake system characterized by, The system comprises a booster system (104), a brake master cylinder (103) and a liquid storage tank (102); the brake master cylinder (103) is connected with the liquid storage tank (102) through the control valve assembly according to claim 10. When the brake system is self-inspected: the supercharging system (104) supercharges 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 will accumulate in the flow channel (301) to form a stable pressure difference, and the pressure difference is collected by the pressure sensor connected with the brake master cylinder (103); the sealing property of the brake system is determined according to the pressure value corresponding to the pressure difference under the set pushing speed.

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