Brake master cylinder assembly, braking system, and braking system control method

Abstract

The present invention relates to a master brake cylinder assembly, a braking system and a braking system control method. The master brake cylinder assembly includes a master brake cylinder, the master brake cylinder includes a cylinder block and a piston push rod disposed in the cylinder block. An oil inlet and an oil outlet are provided on the cylinder block. The piston push rod is used to connect with a brake pedal. A switching valve is provided on the cylinder block, and the switching valve is located at the oil inlet. The switching valve is used to control the opening and closing of the oil inlet according to the movement process of the brake pedal. By providing the switching valve at the oil inlet, when the brake pedal is depressed, the switching valve directly operates to block the oil inlet, without waiting for the piston push rod to move to block the oil inlet, thereby improving the sensitivity of the reaction during braking and shortening the initial dead travel during braking.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive braking, and particularly to a master cylinder assembly, a braking system, and a braking system control method. Background Art

[0002] In the technical field of automotive braking, generally a hydraulic system is used to implement the braking process. Specifically, the action of stepping on the brake pedal is reflected in the movement of the telescopic rod in the master cylinder. When the brake pedal is depressed, the telescopic rod is pushed into the master cylinder, and the piston follows the movement to close the oil inlet and open the oil outlet, thereby controlling the movement of the brake assembly to implement the braking process. However, there is generally a problem that the reaction of the automotive braking process is not sensitive enough. Summary of the Invention

[0003] In view of the above problem of insufficient sensitivity in the braking process, the present invention provides a master cylinder assembly, a braking system, and a braking system control method to improve the sensitivity.

[0004] A master cylinder assembly includes a master cylinder, the master cylinder includes a cylinder block and a piston push rod disposed in the cylinder block, the cylinder block is provided with an oil inlet and an oil outlet, the piston push rod is used to connect with the brake pedal, a switching valve is provided on the cylinder block, the switching valve is located at the oil inlet, and the switching valve is used to control the opening and closing of the oil inlet according to the movement process of the brake pedal.

[0005] The above solution provides a master cylinder assembly. By providing the switching valve at the oil inlet, when the brake pedal is depressed, the switching valve directly operates to block the oil inlet, without waiting for the piston push rod to move to block the oil inlet, thereby improving the sensitivity of the reaction during braking and shortening the initial empty stroke during braking.

[0006] In one embodiment, the cylinder block includes a cylinder body and an auxiliary housing disposed outside the cylinder body, the piston push rod is disposed in the cylinder body, an oil through hole is provided at the position of the auxiliary housing on the cylinder body, the oil inlet is provided on the auxiliary housing, and the switching valve is located in the auxiliary housing;

[0007] And / or, the switching valve includes an electromagnetic valve.

[0008] In one embodiment, the switching valve includes two valve bodies, one of the valve bodies is located at the oil inlet and is used to control the opening and closing of the oil inlet according to the movement process of the brake pedal, and the other valve body is located at the oil outlet and is used to control the opening and closing of the oil outlet according to the movement process of the brake pedal.

[0009] In one embodiment, the oil inlet and the oil outlet are arranged in sequence and spaced apart in the axial direction of the piston push rod, the two valve bodies are connected, the two valve bodies are arranged in sequence in the axial direction of the piston push rod, and the distance between the two valve bodies is not equal to the distance between the oil inlet and the oil outlet.

[0010] In one embodiment, an intermediate piston is provided in the brake master cylinder, and the intermediate piston divides the cavity in the brake master cylinder into a first cavity and a second cavity in the axial direction. A first elastic return member is provided between the intermediate piston and the piston push rod, and a second elastic return member is provided between the end of the brake master cylinder away from the piston push rod and the intermediate piston. An oil inlet and an oil outlet form an oil port group. Two oil port groups are provided on the cylinder body, one of which is connected to the first cavity and the other is connected to the second cavity. There are two switch valves, and the switch valves are arranged in a one-to-one correspondence with the oil port groups.

[0011] In one embodiment, the switch valve includes two valve bodies, and the four valve bodies are connected in sequence in the axial direction of the piston push rod. The two valve bodies of the same switch valve respectively correspond to the oil inlet and oil outlet of the same oil port group, and the two switch valves share an electromagnet coil for controlling the movement of the valve body.

[0012] A braking system comprises a brake pedal and the above-mentioned brake master cylinder assembly, wherein the brake pedal is arranged on the piston push rod, and when the brake pedal is stepped on, the piston push rod moves into the brake master cylinder.

[0013] The above scheme provides a braking system, which effectively improves the sensitivity of the braking system during braking and shortens the idle travel of the brake pedal in the initial stage of being stepped on by adopting the brake master cylinder assembly described in any of the above embodiments.

[0014] In one embodiment, it includes a detection member and a controller which are electrically connected to each other, the detection member is used to detect whether the brake pedal is stepped on, and the switch valve is electrically connected to the controller.

[0015] A braking system control method is used to control the above braking system, and the braking system control method comprises the following steps:

[0016] Acquire a signal of whether the brake pedal is depressed;

[0017] If the signal shows that the brake pedal is stepped on, the switch valve is controlled to operate, the oil inlet is blocked, and the oil outlet is connected.

[0018] The above solution provides a braking system control method for controlling the braking system described in any of the above embodiments. When the acquired signal indicates that the brake pedal is depressed, the switching valve is actively controlled to operate, blocking the oil inlet, thereby improving the sensitivity of the braking process.

[0019] In one of the embodiments, the following steps are further included:

[0020] If the signal indicates that the brake pedal is not depressed, the switching valve is controlled to reset, blocking the oil outlet and opening the oil inlet. Description of the Drawings

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of a general master cylinder;

[0024] Figure 2 It is a schematic structural diagram of the master cylinder assembly in this embodiment when the brake pedal is depressed;

[0025] Figure 3 It is a schematic structural diagram of the master cylinder assembly in this embodiment when the brake pedal is not depressed;

[0026] Figure 4 It is a flowchart of the braking system control method in this embodiment.

[0027] Description of the Reference Numerals:

[0028] 10. Master cylinder assembly; 11. Master cylinder; 111. Cylinder block; 1111. Cylinder body; 1112. Auxiliary housing; 1113. Oil inlet; 1114. Oil outlet; 1115. Oil passage hole; 112. Piston push rod; 113. Intermediate piston; 1131. First elastic reset member; 1132. Second elastic reset member; 114. First cavity; 115. Second cavity; 12. Switching valve; 121. Valve body; 20. Fuel tank. Detailed Description of the Embodiments

[0029] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following provides a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0030] As Figure 1 shown, in the field of automotive braking, generally, during the braking process, the piston push rod 112 itself moves to block the oil inlet 1113, thereby implementing the braking process. Specifically, as Figure 1 shown, the master cylinder 11 is provided with an oil inlet 1113 communicating with the fuel tank 20. When the brake pedal is depressed, the piston push rod 112 moves, and only after the piston push rod 112 moves a certain distance can the oil inlet 1113 be blocked, resulting in a relatively long dead travel of the brake pedal at the initial stage of braking. In this case, if the braking sensitivity is to be improved, higher manufacturing precision of the master cylinder 11 and deformation precision of the spring are required.

[0031] Based on this, as Figure 2 and Figure 3 shown, in one embodiment, a master cylinder assembly 10 is provided, including a master cylinder 11. The master cylinder 11 includes a cylinder block 111 and a piston push rod 112 disposed in the cylinder block 111. The piston push rod 112 is used to connect with the brake pedal. The cylinder block 111 of the master cylinder 11 is provided with an oil inlet 1113 and an oil outlet 1114. A switching valve 12 is provided on the cylinder block 111. The switching valve 12 is located at the oil inlet 1113, and the switching valve 12 is used to control the opening and closing of the oil inlet 1113 according to the movement process of the brake pedal.

[0032] During use, when the brake pedal is depressed, the switching valve 12 directly operates to block the oil inlet 1113, without waiting for the piston push rod 112 to move to block the oil inlet 1113. The response to the action of depressing the brake pedal is rapid and sensitive, thereby improving the sensitivity of the braking response and shortening the dead travel at the initial stage of braking.

[0033] Specifically, the switching valve 12 may include an electromagnetic valve. The electromagnetic valve may be electrically connected to a brake pedal switch or a stroke sensor of the brake pedal. As Figure 2 shown, when the brake pedal is depressed, the electromagnetic valve operates to block the oil inlet 1113, so that the brake fluid in the cylinder block 111 can only flow out from the oil outlet 1114. As Figure 3As shown, when the brake pedal is not depressed, the solenoid valve is in a reset state, the oil inlet 1113 is open, and the brake fluid flows back into the cylinder 111 .

[0034] Furthermore, an elastic reset member is provided between the piston push rod 112 and the end surface of the cylinder body 111. When the brake pedal is not stepped on, under the action of the elastic reset member, the piston push rod 112 moves to the initial position, waiting for the next braking process.

[0035] Optionally, the switch valve 12 may also be other valve body 121 structures, as long as when the brake pedal is stepped on, the switch valve 12 can operate to block the oil inlet 1113. For example, the switch valve 12 is a linkage structure connected to the pedal, and when the brake pedal is stepped on, the switch valve 12 moves to block the oil inlet 1113.

[0036] Specifically, Figure 1 and Figure 2 As shown, in one embodiment, the cylinder body 111 includes a cylinder body 1111 and an auxiliary housing 1112 disposed outside the cylinder body 1111. The piston push rod 112 is disposed in the cylinder body 1111, and when the brake pedal is stepped on, the piston push rod 112 moves in the cylinder body 1111. An oil through hole 1115 is disposed at the position where the auxiliary housing 1112 is disposed on the cylinder body 1111, so that the brake fluid can flow freely in the cylinder body 1111 and the auxiliary housing 1112. The oil inlet 1113 is disposed on the auxiliary housing 1112, and the switch valve 12 is located in the auxiliary housing 1112.

[0037] When the brake pedal is stepped on, the switch valve 12 moves in the auxiliary housing 1112 to block the oil inlet 1113. As the piston push rod 112 continues to move, the space for accommodating the brake fluid in the cylinder body 1111 is reduced, and the brake fluid in the cylinder body 1111 automatically flows to the oil outlet 1114 and flows out from the oil outlet 1114 to implement the braking process.

[0038] Since the switch valve 12 is arranged outside the cylinder body 1111, the movement of the piston push rod 112 is not hindered, thereby improving the sensitivity and ensuring the normal movement of the piston push rod 112.

[0039] More specifically, if Figure 2 and Figure 3As shown, the cross-section of the cylinder body 1111 is consistent with the cross-section of the piston in the piston push rod 112. For example, the cylinder body 1111 is a cylindrical barrel, and the moving direction of the piston push rod 112 in the cylinder body 111 is along the axial direction of the cylinder body 1111.

[0040] Further, as Figure 2 and Figure 3 shown, in one embodiment, the oil outlet 1114 is provided on the auxiliary housing 1112. Based on the oil passing through hole 1115 connecting the space in the cylinder body 1111 and the space enclosed by the auxiliary housing 1112, when the brake pedal is depressed, the brake fluid in the cylinder body 1111 can flow through the oil passing through hole 1115 to the oil outlet 1114.

[0041] It should be noted that in order to avoid the situation where the movement of the piston push rod 112 blocks the oil passing through hole 1115, resulting in the inability of the brake fluid to be discharged from the oil outlet 1114. In one embodiment, in the axial direction of the cylinder body 1111, the oil passing through hole 1115 is at least flush with the oil outlet 1114, or the oil passing through hole 1115 is located on the side of the oil outlet 1114 away from the piston push rod 112.

[0042] For example, in one embodiment, as Figure 2 and Figure 3 shown, the oil passing through hole 1115 includes a plurality of small holes, and the plurality of small holes are arranged at intervals and distributed between the oil inlet 1113 and the oil outlet 1114.

[0043] Further, in one embodiment, the position where the piston push rod 112 stops moving when the brake pedal is depressed is the stop position. When the brake pedal is not depressed, the position where the piston push rod 112 is located is the start position. When the piston push rod 112 is at the stop position, the part of the oil passing through hole 1115 in the conducting state is located on the side of the piston push rod 112 away from the initial position.

[0044] In other words, when the oil passing through hole 1115 includes a plurality of small holes, when the piston push rod 112 is at the stop position, the small holes in the conducting state are located on the side of the piston push rod 112 away from the initial position. Thus, it can not only make the brake fluid in the cylinder body 1111 flow to the oil outlet 1114, but also ensure that the part of the space enclosed by the cylinder body on the side of the piston push rod 112 close to the start position is not in communication with the space on the other side, ensuring the smooth progress of the braking process.

[0045] Furthermore, in one embodiment, the switch valve 12 includes two valve bodies 121, one of the valve bodies 121 is located at the oil inlet 1113, and is used to control the switch of the oil inlet 1113 according to the movement process of the brake pedal, and the other valve body 121 is located at the oil outlet 1114, and is used to control the switch of the oil outlet 1114 according to the movement process of the brake pedal.

[0046] When the brake pedal is stepped on, the switch valve 12 operates, the valve body 121 corresponding to the oil inlet 1113 blocks the oil inlet 1113, and the oil outlet 1114 is in a conducting state. When the brake pedal is not stepped on, the switch valve 12 is reset, the valve body 121 corresponding to the oil outlet 1114 blocks the oil outlet 1114, and the valve body 121 corresponding to the oil inlet 1113 is reset, so that the oil inlet 1113 is conducting.

[0047] More specifically, in one embodiment, the oil inlet 1113 and the oil outlet 1114 are sequentially arranged at intervals in the axial direction of the piston push rod 112. The two valve bodies 121 are connected, and the two valve bodies 121 are sequentially arranged in the axial direction of the piston push rod 112, and the spacing between the two valve bodies 121 is not equal to the spacing between the oil inlet 1113 and the oil outlet 1114. Therefore, when the two valve bodies 121 move, only the oil inlet 1113 or the oil outlet 1114 can be blocked, and the oil inlet 1113 and the oil outlet 1114 will not be blocked at the same time.

[0048] The two valve bodies 121 move synchronously. When the brake pedal is stepped on, the two valve bodies 121 move to a position where one of the valve bodies 121 blocks the oil inlet 1113 and the oil outlet 1114 is connected; after the brake pedal is reset, the two valve bodies 121 move synchronously to a position where one of the valve bodies 121 blocks the oil outlet 1114 and the oil inlet 1113 is connected.

[0049] Further, in one embodiment, if Figure 2 and Figure 3 As shown, the brake master cylinder 11 is provided with an intermediate piston 113, and the intermediate piston 113 divides the cavity in the brake master cylinder 11 into a first cavity 114 and a second cavity 115 in the axial direction. A first elastic return member 1131 is provided between the intermediate piston 113 and the piston push rod 112, and a second elastic return member 1132 is provided between the end of the brake master cylinder 11 away from the piston push rod 112 and the intermediate piston 113. Specifically, as Figure 2 and Figure 3 As shown, the first elastic return member 1131 and the second elastic return member 1132 can be compression springs.

[0050] When the brake pedal is depressed, the piston push rod 112 moves. Under the action of the first elastic reset member 1131, the intermediate piston 113 moves, and the second elastic reset member 1132 is compressed. As the moving distance of the piston push rod 112 increases, both the first spring reset member 1131 and the second spring reset member 1132 are in a compressed state.

[0051] Further, one oil inlet 1113 and one oil outlet 1114 form a set of oil ports. Two sets of oil ports are provided on the cylinder block 111. One set of oil ports is communicated with the first cavity 114, and the other set of oil ports is communicated with the second cavity 115. There are two switching valves 12, and the switching valves 12 are arranged in one-to-one correspondence with the sets of oil ports.

[0052] When the brake pedal is depressed, both of the two switching valves 12 operate, so that the oil inlets 1113 in the two sets of oil ports are blocked. Thus, the brake fluid in the first cavity 114 and the second cavity 115 can only flow out from the corresponding oil outlets 1114. The brake fluid flowing out from the first cavity 114 and the brake fluid flowing out from the second cavity 115 can be respectively used to control the braking of the left and right wheels. Based on the process that the two oil inlets 1113 are blocked is caused by the active movement of the two switching valves 12. In other words, when the brake pedal is depressed, both of the two switching valves 12 operate, thereby synchronously blocking the two oil inlets 1113, so as to make the braking processes of the left and right wheels synchronous and improve the synchronous consistency of the braking of the left and right wheels.

[0053] Further, the two switching valves 12 can share an electromagnetic coil, so that the valve bodies 121 of the two switching valves 12 are controlled by the same electromagnetic coil, further improving the synchronism of the opening and closing of the two oil inlets 1113.

[0054] More specifically, in one embodiment, as Figure 2 and Figure 3 shown, the switching valve 12 includes two valve bodies 121. Then, the two switching valves 12 altogether include four valve bodies 121. The four valve bodies 121 are sequentially connected in the axial direction of the piston push rod 112. The two valve bodies 121 of the same switching valve 12 respectively correspond to the oil inlet 1113 and the oil outlet 1114 of the same set of oil ports. The two switching valves 12 share an electromagnetic coil for controlling the movement of the valve bodies 121.

[0055] As Figure 2As shown, when the brake pedal is stepped on, the solenoid coil is energized and the valve body 121 is attracted, the two valve bodies 121 corresponding to the oil inlet 1113 block the oil inlet 1113, and the two valve bodies 121 corresponding to the oil outlet 1114 are offset from the oil outlet 1114, and the oil outlet 1114 is connected. Figure 3 As shown, when the brake pedal is not depressed, the electromagnet coil is de-energized, and under the reset action of the spring in the electromagnet coil, the four valve bodies 121 connected to each other move, and the two valve bodies 121 corresponding to the oil inlet 1113 move to be offset from the corresponding oil inlet 1113, and the oil inlet 1113 is connected, and the two valve bodies 121 corresponding to the oil outlet 1114 respectively block the two oil outlets 1114.

[0056] Furthermore, in another embodiment, a braking system is provided, including a brake pedal and the above-mentioned brake master cylinder assembly 10 , wherein the brake pedal is arranged on the piston push rod 112 , and when the brake pedal is stepped on, the piston push rod 112 moves into the brake master cylinder 11 .

[0057] The above scheme provides a braking system, which effectively improves the sensitivity of the braking system during braking and shortens the idle travel of the brake pedal in the initial stage of being stepped on by adopting the brake master cylinder assembly 10 in any of the above embodiments.

[0058] Furthermore, in one embodiment, the braking system further includes a detection component and a controller electrically connected to each other, the detection component is used to detect whether the brake pedal is depressed, and the switch valve 12 is electrically connected to the controller.

[0059] When the detection element detects that the brake pedal is stepped on, the controller controls the switch valve 12 to operate and block the oil inlet 1113. Further, when the detection element detects that the brake pedal is not stepped on, the controller can also control the switch valve 12 to reset and make the oil inlet 1113 conductive.

[0060] Specifically, the detection member may include a pedal switch member, or the detection member may include a pedal forming detection member.

[0061] Furthermore, in yet another embodiment, Figure 4 A braking system control method is provided for controlling the above braking system, and the braking system control method comprises the following steps:

[0062] Acquire a signal of whether the brake pedal is depressed;

[0063] If the signal shows that the brake pedal is stepped on, the switch valve 12 is controlled to operate, the oil inlet 1113 is blocked, and the oil outlet 1114 is connected.

[0064] A braking system control method provided by the above solution is used to control the braking system described in any of the above embodiments. When the acquired signal indicates that the brake pedal is depressed, the switching valve 12 is actively controlled to operate, blocking the oil inlet 1113, thereby improving the sensitivity of the braking process.

[0065] Further, in one embodiment, the braking system control method further includes the following steps:

[0066] If the signal indicates that the brake pedal is not depressed, the switching valve 12 is controlled to reset, blocking the oil outlet 1114 and conducting the oil inlet 1113.

[0067] The switching valve 12 is correspondingly arranged with the oil inlet 1113 and the oil outlet 1114, so that the switching valve 12 can switch between two states of blocking the oil inlet 1113 or blocking the oil outlet 1114. The state of the switching valve 12 is controlled according to the acquired signal indicating whether the brake pedal is depressed.

[0068] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0069] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0070] In the present invention, unless otherwise clearly specified or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher level than the second feature in terms of horizontal height. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature in terms of horizontal height.

[0072] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0073] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0074] The above-described embodiments only represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims.

Claims

1. A master cylinder assembly, characterized in that, The invention comprises a brake master cylinder, the brake master cylinder comprises a cylinder body and a piston push rod arranged in the cylinder body, the cylinder body is provided with an oil inlet and an oil outlet, the piston push rod is used to be connected with a brake pedal, the cylinder body is provided with a switch valve, the switch valve comprises two valve bodies, one of the valve bodies is located at the oil inlet and is used to control the oil inlet switch according to the movement process of the brake pedal, and the other valve body is located at the oil outlet and is used to control the oil outlet switch according to the movement process of the brake pedal; The cylinder body comprises a cylinder body and an auxiliary shell arranged outside the cylinder body, the piston push rod is arranged in the cylinder body, an oil through hole is arranged at the position where the auxiliary shell is arranged on the cylinder body, and the oil inlet and the oil outlet are arranged on the auxiliary shell; The oil inlet and the oil outlet are arranged in sequence and spaced apart in the axial direction of the piston push rod, the two valve bodies are connected, the two valve bodies are arranged in sequence in the axial direction of the piston push rod, and the spacing between the two valve bodies is not equal to the spacing between the oil inlet and the oil outlet; An intermediate piston is provided in the brake master cylinder, and the intermediate piston divides the cavity in the brake master cylinder into a first cavity and a second cavity in the axial direction. A first elastic return member is provided between the intermediate piston and the piston push rod, and a second elastic return member is provided between the end of the brake master cylinder away from the piston push rod and the intermediate piston. An oil inlet and an oil outlet form an oil port group. Two oil port groups are provided on the cylinder body, one of which is connected to the first cavity, and the other is connected to the second cavity. There are two switch valves, and the switch valves are arranged in a one-to-one correspondence with the oil port groups.

2. The master cylinder assembly according to claim 1, characterized in that The switch valve includes a solenoid valve.

3. The master cylinder assembly according to claim 1, wherein The switch valve includes two valve bodies, and the four valve bodies are connected in sequence in the axial direction of the piston push rod. The two valve bodies of the same switch valve respectively correspond to the oil inlet and oil outlet of the same oil port group, and the two switch valves share an electromagnet coil for controlling the movement of the valve body.

4. A braking system, characterized in that, The invention comprises a brake pedal and a brake master cylinder assembly according to any one of claims 1 to 3, wherein the brake pedal is arranged on the piston push rod, and when the brake pedal is stepped on, the piston push rod moves into the brake master cylinder.

5. The braking system according to claim 4, wherein, It comprises a detection component and a controller which are electrically connected to each other, wherein the detection component is used to detect whether the brake pedal is stepped on, and the switch valve is electrically connected to the controller.

6. A braking system control method, characterized in that, Used to control the braking system according to claim 4 or 5, the braking system control method comprises the following steps: Acquire a signal of whether the brake pedal is depressed; If the signal shows that the brake pedal is stepped on, the switch valve is controlled to operate, the oil inlet is blocked, and the oil outlet is connected.

7. The braking system control method according to claim 6, characterized in that, The following steps are also included: If the signal shows that the pedal is not stepped on, the switch valve is controlled to reset, the oil outlet is blocked, and the oil inlet is connected.

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