Vehicle brake control device and control system

Abstract

The vehicle brake control device comprises a shell, one end of the shell is provided with a sealing plate A, a sliding cavity is arranged in the shell, a piston A is arranged in the sliding cavity, a compression spring is arranged between the piston A and the sealing plate A, the other end of the shell is provided with a sealing plate B, a middle part of the piston A is provided with a protruding shaft, the protruding shaft protrudes from the sealing plate B, an air cavity is arranged between the sealing plate B and the piston A, the shell is provided with an air inlet which is in communication with the air cavity, and the outer end of the air inlet is connected to an air valve switch; a cavity is arranged in the protruding shaft, a protruding rod is arranged in the cavity, the protruding rod is provided with a return spring, the return force of the return spring makes the protruding rod retract into the protruding shaft; one side of the sealing plate A towards the sliding cavity is provided with a plunger shell, the inner end of the plunger shell is provided with a stop surface for limiting the piston or the protruding shaft, the plunger shell is arranged with a plunger A, the inner end of the plunger A is in contact with the inner end of the protruding rod, and the outer end of the plunger is provided with an oil inlet on the sealing plate A; the application improves the working reliability of the automobile brake system and improves the safety of driving.

Description

Technical Field

[0001] This invention relates to the field of automotive braking control systems, specifically to vehicle braking control devices and control systems. Background Technology

[0002] Currently, commercial vehicle air brake control systems have the following problems: 1. The front and rear brake wheel chambers are far apart and operate at different times, making it impossible to sense them simultaneously, which affects the risk of tail-end collisions or deviations during braking; 2. There is a transmission process from the brake pedal operating mechanism to the brake actuator, resulting in a long reaction time and a long braking distance; 3. The throttle valve, relay valve, distribution valve, and each brake axle are paired with two brake chambers. The numerous components are prone to damage and air leakage, and multiple brake chambers consume air, affecting air pressure and causing the risk of brake failure and loss of control; 4. Because the opening process of the main control valve is sequential, and the relay valve is driven by air, the valve can only be either not opened or fully opened, making it impossible to stably open from small to large, resulting in poor stability. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art and to provide a vehicle braking control device and control system.

[0004] This invention provides the following specific solution: a vehicle braking control device, including a housing, a sealing plate A at one end of the housing, a sliding cavity inside the housing containing a piston A, a compression spring between the piston A and the sealing plate A, a sealing plate B at the other end of the housing, the sealing plate B having an output port, an extension shaft at the middle of the piston A extending out of the housing from the output port, a seal between the extension shaft and the output port, an air chamber between the sealing plate B and the piston A, an air inlet communicating with the air chamber in the housing, the outer end of the air inlet connected to an air valve switch; a cavity inside the extension shaft containing an extension rod, a return spring on the extension rod, the restoring force of the return spring causing the extension rod to retract into the extension shaft; a plunger housing on the side of the sealing plate A facing the sliding cavity, a stop surface at the inner end of the plunger housing for limiting the piston or the extension shaft, a plunger A inside the plunger housing, the inner end of the plunger A contacting the inner end of the extension rod, and an oil inlet at the outer end of the sealing plate A located on the plunger A.

[0005] Furthermore, the portion of the extension rod located outside the extension shaft is provided with a limiting sleeve.

[0006] Furthermore, a retaining ring is provided on the outer side of the sealing plate A or sealing plate B, and a positioning boss is provided on the outer side of the sealing plate A or sealing plate B. The retaining ring is engaged between the positioning boss and the slot on the inner wall of the outer shell.

[0007] The present invention also provides a vehicle braking control system, specifically, including the above-mentioned vehicle braking control device, and further including a pneumatic hydraulic plunger pump and a pneumatic control device. The pneumatic hydraulic plunger pump is provided with a high-pressure oil outlet and a high-pressure air inlet. The high-pressure oil outlet is connected to the oil inlet of the vehicle braking control device. The pneumatic control device is provided with an air inlet and an air outlet. A valve mechanism is provided between the air inlet and the air outlet. A compressed air source is connected to the outer end of the air inlet. The air outlet is connected to the high-pressure air inlet of the pneumatic hydraulic plunger pump.

[0008] Furthermore, the pneumatic hydraulic plunger pump includes a housing with a sliding cavity inside. A plunger B is installed within the sliding cavity. The sliding cavity has an oil inlet on one side of the plunger B and a high-pressure oil outlet on the other end. The side of the sliding cavity near the oil inlet is a low-pressure oil chamber, and the side near the high-pressure oil outlet is a high-pressure oil chamber. An operating rod is located on the side of the plunger B closest to the oil inlet. A sealing ring is installed on the side of the sliding cavity near the operating rod. The operating rod extends outward from the inner hole of the sealing ring. An oil passage is provided inside the plunger, connecting the low-pressure oil chamber and the high-pressure oil chamber. A hydraulic valve mechanism is installed within the oil passage. When the plunger is pushed inward to a certain depth by the operating rod, the hydraulic valve mechanism closes the oil passage, thereby increasing the oil pressure in the high-pressure oil chamber. An airtight housing is connected to the side of the housing facing the operating rod. An airtight housing has an air inlet at one end and a piston B is installed inside. A return spring is installed between the piston B and the housing. The outer end of the operating rod is connected to the piston.

[0009] Furthermore, the operating lever is movably connected to the piston.

[0010] Furthermore, the oil passage includes a stepped hole disposed within the plunger B, the large hole of which houses the hydraulic valve mechanism, and the small hole sidewall of the stepped hole has an oil hole communicating with the low-pressure oil chamber; the hydraulic valve mechanism includes a valve cover installed within the large hole, one end of which has a valve stem, the valve stem being smaller than the small hole, and the valve stem passing through the small hole; the inner end of the operating rod has a waist-shaped guide hole, which is radially arranged and contains a limit pin, one end of the valve stem being fixedly connected to the limit pin; one end of the large hole is fitted with a retaining ring, and a return spring is fitted between the retaining ring and the valve cover.

[0011] Furthermore, the limiting pin has a hole in the middle, one end of the valve stem is inserted into the hole and fixedly connected to the limiting pin, and the length of the limiting pin is less than the diameter of the sliding cavity.

[0012] Furthermore, the valve cover is equipped with a rubber sealing ring.

[0013] Furthermore, the pneumatic control device is equipped with a valve drive mechanism, which includes a plunger C, and the outer end of the plunger C is connected to a plunger-type hydraulic control device or a push rod.

[0014] Furthermore, the plunger-type hydraulic control device includes a housing with a sliding cavity inside. A plunger D is installed at one end of the sliding cavity. The sliding cavity has an oil inlet on one side of the plunger D and an oil outlet on the other side. The side of the sliding cavity with the oil inlet is a low-pressure oil cavity, and the side with the oil outlet is a high-pressure oil cavity. An operating rod is provided on the side of the plunger D near the oil inlet. A sealing ring is installed on the side of the sliding cavity with the operating rod. The operating rod extends outward from the inner hole of the sealing ring. An oil passage is provided inside the plunger D, which connects the low-pressure oil cavity and the high-pressure oil cavity. A hydraulic valve mechanism is installed in the oil passage. When the plunger D is pushed inward to a certain depth by the operating rod, the hydraulic valve mechanism closes the oil passage, thereby increasing the oil pressure in the high-pressure oil cavity.

[0015] Furthermore, two seals are installed on the outer wall of piston A and at the output port of sealing plate B, and an oil groove is provided between the two seals, which is filled with lubricating oil or grease.

[0016] Compared to existing technologies, this solution offers the following advantages: 1. The transmission from the foot pedal operating mechanism to the air pressure control master valve and then to the wheel braking mechanism utilizes hydraulic pressure, achieving zero-to-zero sensing speed. Therefore, compared to pure air pressure transmission, this invention provides a shorter and more timely sensing time, reducing braking distance and enhancing safety. 2. The braking force of this invention utilizes air pressure to drive the hydraulic valve, resulting in hydraulic pressure-driven braking. This effectively increases braking force and allows for precise matching based on the braking force of various axle types. Compared to direct air pressure actuation, this solution provides force enhancement and stabilization, improving the overall accuracy of front and rear braking forces.

[0017] 3. The hydraulically driven pneumatic main valve of this invention has the functions of saving effort and stabilizing force, and can effectively and smoothly control the output of the pneumatic valve according to the size of the valve.

[0018] 4. The pneumatic pressure chamber energy of the pneumatic hydraulic valve of this invention can generate brake oil pressure that can effectively supply the two brake chambers of the same axle. Compared with the traditional method of matching the energy of two pneumatic pressure chambers of the same axle, it can effectively save air pressure and better ensure the safe supply of air pressure when the brake is pressed tightly.

[0019] 5. It reduces the cost of multiple components and pipelines such as throttle valves, distribution valves, and relay valves, as well as the safety risks of insufficient air pressure caused by the easy damage and leakage of multiple components and valves, and saves air pumping energy.

[0020] 6. The plunger A and piston of the vehicle braking control device of the present invention can move and work independently without mutual wear and load, which enhances the durability, stability and safety of the hydraulic and pneumatic pistons.

[0021] 7. Compared with traditional brake control devices, the brake chamber is shorter, saving vehicle installation space and cost.

[0022] This invention is widely applicable to various types of passenger and commercial vehicles. Compared with traditional pneumatic actuators, it offers significant advantages in terms of reduced effort, stability, and increased force from foot pedal operation to the actuator. Braking is noticeably faster, more accurate, and more stable, effectively shortening braking distance and reducing safety risks such as skidding and veering. It also effectively saves energy for air inflation and reduces the risk of air leakage, ensuring a continuous and safe air pressure supply and reducing the risk of brake failure and loss of control due to insufficient air pressure caused by leaks and air consumption. Furthermore, it effectively achieves precise matching of braking forces throughout the vehicle, and each component has strong resistance to loosening, corrosion, and damage, enhancing safety, stability, and durability. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 3 This is a perspective view of the pneumatic control device of the present invention; Figure 4 This is a schematic diagram of the plunger and operating lever structure of the plunger-type hydraulic control device of the present invention; Figure 5 This is a schematic diagram of the hydraulic valve mechanism of the plunger-type hydraulic control device of the present invention; Figure 6 This is a schematic diagram of the vehicle braking control device according to Embodiment 3 of the present invention; Figure 7 yes Figure 1 A magnified view at point V; In the diagram: 1. Vehicle braking control device; 101. Air chamber; 102. Piston A; 103. Compression spring; 104. Sealing plate A; 141. Positioning boss; 105. Plunger housing; 106. Plunger A; 107. Oil inlet; 108. Extension rod; 109. Return spring; 110. Extension shaft; 111. Sealing plate B; 2. Pneumatic hydraulic plunger pump; 201. High-pressure oil chamber; 202. Low-pressure oil chamber; 203. Piston B; 204. Operating lever; 205. Sealing ring; 206. Limit pin; 207. Hydraulic valve mechanism; 271. Valve cover; 272. Valve stem; 208. Plunger B; 281. Waist-shaped guide hole; 282. Oil hole; 3. Pneumatic control device; 301. Plunger C; 4. Plunger-type hydraulic control device; 401. Plunger D. Detailed Implementation

[0024] Example 1 See Figure 1This embodiment is a vehicle braking control system, including a vehicle braking control device 1, a pneumatic hydraulic plunger pump 2, and a pneumatic control device 3. The vehicle braking control device 1 includes a housing, one end of which is fitted with a sealing plate A104. A sliding cavity is provided inside the housing, and a piston A102 is installed within the sliding cavity. A compression spring 103 is installed between the piston A102 and the sealing plate A104. The other end of the housing is fitted with a sealing plate B111, which has an output port. An extension shaft 110 is provided in the middle of the piston A102, extending out of the housing from the output port. A seal is installed between the extension shaft 110 and the output port. An air chamber is provided between the sealing plate B111 and the piston A102. 101, the outer casing is provided with an air inlet communicating with the air chamber 101, and the outer end of the air inlet is connected to the air valve switch; the extension shaft 110 is provided with a cavity, and an extension rod 108 is installed in the cavity. The extension rod 108 is equipped with a return spring 109. The restoring force of the return spring 109 causes the extension rod 108 to retract into the extension shaft 110; the sealing plate A104 is provided with a plunger housing 105 on the side facing the sliding cavity. The inner end of the plunger housing 105 is provided with a stop surface for limiting the piston or the extension shaft 110. The plunger housing 105 is provided with a plunger A106. The inner end of the plunger A106 contacts the inner end of the extension rod 108. The sealing plate A104 is provided with an oil inlet 107 at the outer end of the plunger A106.

[0025] Furthermore, the portion of the extension rod 108 located outside the extension shaft 110 is connected to a limiting sleeve. The function of the limiting sleeve is to cause the extension rod 108 to extend outward together when the extension shaft 110 extends outward, so that the braking actuator can perform braking work. The limiting sleeve can be a nut, and the nut is threadedly connected to the outer end of the extension rod.

[0026] Further, see Figure 7 The outer side of the sealing plate A104 is equipped with a retaining ring, and the outer side of the sealing plate A104 is provided with a ring of positioning bosses 141. The retaining ring is engaged between the positioning bosses 141 and the retaining groove. Even if the retaining ring breaks, it will not come out, thus improving the reliability and stability of the components.

[0027] Furthermore, the pneumatic hydraulic plunger pump 2 is provided with a high-pressure oil outlet and a high-pressure air inlet. The high-pressure oil outlet is connected to the oil inlet 107 of the vehicle braking control device 1. The pneumatic control device 3 is provided with an air inlet and an air outlet. A valve mechanism is provided between the air inlet and the air outlet. A compressed air source is connected to the outer end of the air inlet. The air outlet is connected to the high-pressure air inlet of the pneumatic hydraulic plunger pump 2.

[0028] See Figure 3The structure of the pneumatic control device 3 described in this embodiment is basically similar to that of the patent publication number CN116461481A entitled "A pneumatic and hydraulic dual-purpose vehicle braking control device 1". The difference is that the valve drive mechanism used in the pneumatic control device 3 includes a plunger C301. The outer end of the plunger C301 is connected to a push rod. The valve mechanism of each working chamber is opened synchronously by applying a thrust to the push rod directly from the outside.

[0029] Each working chamber of the air pressure control device 3 is independent of each other, and each working chamber can be connected to one of the aforementioned vehicle braking control devices 1. Each vehicle braking control device 1 corresponds to one brake wheel. By synchronously opening / closing the valve mechanism of the air pressure control device 3, the brake wheels can be braked synchronously, avoiding braking time differences between different brake wheels.

[0030] Furthermore, the pneumatic hydraulic plunger pump 2 includes a housing, within which a sliding cavity is provided. A plunger B208 is installed within the sliding cavity. The sliding cavity has an oil inlet on one side of the plunger B208 and a high-pressure oil outlet on the other end. The side of the sliding cavity near the oil inlet is a low-pressure oil chamber 202, and the side near the high-pressure oil outlet is a high-pressure oil chamber 201. An operating rod 204 is provided on the side of the plunger B208 near the oil inlet. A sealing ring 205 is installed on the side of the sliding cavity near the operating rod 204. The operating rod 204 extends outward from the inner hole of the sealing ring 205. The unit is equipped with an oil passage that connects the low-pressure oil chamber 202 and the high-pressure oil chamber 201. The oil passage is equipped with an oil pressure valve mechanism 207. When the plunger is pushed inward to a certain depth by the operating rod 204, the oil pressure valve mechanism 207 closes the oil passage, thereby increasing the oil pressure in the high-pressure oil chamber 201. An airtight housing is connected to the side of the outer shell facing the operating rod 204. One end of the airtight housing is equipped with an air inlet. A piston B203 is installed inside the airtight housing. A return spring is installed between the piston B203 and the outer shell. The outer end of the operating rod 204 is connected to the piston.

[0031] Furthermore, the operating lever 204 is movably connected to the piston, specifically by means of a ball joint, pin joint, universal joint, etc., so that the plunger B208 and the piston B203 can move coaxially without interfering with each other.

[0032] Further, see Figure 4 , 5The oil passage includes a stepped hole disposed within the plunger B208. The large hole of the stepped hole houses the hydraulic valve mechanism 207, and the small hole sidewall of the stepped hole has an oil hole 282 communicating with the low-pressure oil chamber 202. The hydraulic valve mechanism 207 includes a valve cover 271 installed within the large hole. One end of the valve cover 271 has a valve stem 272, the size of which is smaller than the small hole, and the valve stem 272 passes through the small hole. The inner end of the operating rod 204 has a waist-shaped guide hole 281, which is radially through and has a limit pin 206 installed within it. One end of the valve stem 272 is fixedly connected to the limit pin 206. A retaining ring is installed at one end of the large hole, and a return spring 109 is installed between the retaining ring and the valve cover 271.

[0033] Furthermore, the limiting pin 206 has an insertion hole in the middle, and one end of the valve stem 272 is inserted into the insertion hole and fixedly connected to the limiting pin 206. The length of the limiting pin 206 is less than the diameter of the sliding cavity.

[0034] Furthermore, a rubber sealing ring is installed on the valve cover 271. The working principle of the vehicle braking control device 1 of the present invention is as follows: During normal operation, the air chamber 101 is filled with gas at a certain pressure from the outside, causing the piston A102 to squeeze to the right and be blocked by the stop surface of the plunger housing 105. When high-pressure oil is input to the rear end of the plunger housing 105, it pushes the plunger A106 to move to the left, thereby pushing the extension rod 108, so that the extension rod 108 drives the brake actuator to perform braking action.

[0035] When the air valve switch cuts off the air pressure input to the air chamber 101, the compression spring 103 pushes the piston A102 to the left. The piston A102 drives the extension shaft 110, and the extension shaft 110 drives the extension rod 108 to push the brake actuator to the left through the limit sleeve, so as to realize the braking in the parking state. When the air valve switch is opened to fill the air chamber 101 with air pressure, the parking brake state is released.

[0036] When the seal of the air chamber 101 leaks, the air pressure inside the air chamber 101 will be lost, which will cause the parking brake to be unable to be released and the vehicle to be unable to drive normally. At this time, the limit sleeve is removed, so that the extension shaft 110 is disconnected from the extension rod 108. The extension rod 108 is not subjected to the force of the compression spring 103, so it can be normally controlled by the oil pressure of the plunger A106.

[0037] The working principle of the entire braking system is as follows: by operating the push rod of the air pressure control device 3, the valve mechanism of each working chamber is opened synchronously, so that the corresponding different air-push hydraulic plunger pumps 2 are simultaneously supplied with high-pressure gas, thereby simultaneously inputting high-pressure oil into the oil inlet 107 of each vehicle braking control device 1, so as to realize synchronous braking of each brake wheel.

[0038] Furthermore, two seals are installed on the outer wall of the piston A102 and at the output port of the sealing plate B111. An oil groove is provided between the two seals, and the oil groove is filled with lubricating oil or grease. The lubricating oil or grease enhances the wear resistance of the sliding parts and also enhances a certain degree of corrosion resistance.

[0039] See Example 2 Figure 2 This embodiment has a basically the same overall structure as Embodiment 1, except that the plunger C301 is driven by hydraulic pressure, and the outer end of the plunger C301 is connected to a plunger-type hydraulic control device 4. The plunger-type hydraulic control device 4 includes a housing, and a sliding cavity is provided inside the housing. A plunger D401 is installed at one end of the sliding cavity. The sliding cavity has an oil inlet on one side of the plunger D401 and an oil outlet on the other side. The side of the sliding cavity with the oil inlet is a low-pressure oil chamber 202, and the side with the oil outlet is a high-pressure oil chamber 201. An operating lever 204 is provided on the side of plunger D401 near the oil inlet. A sealing ring 205 is installed on the side of the operating lever 204. The operating lever 204 extends outward from the inner hole of the sealing ring 205. An oil passage is provided inside the plunger D401, which connects the low-pressure oil chamber 202 and the high-pressure oil chamber 201. An oil pressure valve mechanism 207 is installed in the oil passage. When the plunger D401 is pushed inward to a certain depth by the operating lever 204, the oil pressure valve mechanism 207 closes the oil passage, thereby increasing the oil pressure in the high-pressure oil chamber 201.

[0040] The structure of the hydraulic valve mechanism 207 is the same as that of the hydraulic valve mechanism 207 of the pneumatic hydraulic plunger pump 2 in Embodiment 1.

[0041] The working principle of the plunger-type hydraulic control device 4 is as follows: Under normal conditions, the upper and lower ends of the limit pin 206 are blocked by the inner end of the sealing ring 205 plate. At the same time, under the action of the limit pin 206, there is a gap between the valve cover 271 and the small hole. At this time, the high-pressure oil chamber 201 and the low-pressure oil chamber 202 are connected, and the oil pressure is equal. When the operating lever 204 is pushed to the left, the right side of the waist-shaped guide hole 281 is first filled by the limit pin 206, and at the same time, the large hole of the plunger D401 is closed by the valve cover 271. At this time, the low-pressure oil chamber 202 and the high-pressure oil chamber 201 are isolated. Continuing to push... When the plunger moves to the left, the oil pressure in the high-pressure oil chamber 201 increases and is input to the pneumatic control device 3 to push the plunger C301. When the operating lever 204 is released, the plunger D401 resets under the action of the return spring, the oil pressure valve mechanism 207 opens the oil passage, and the high-pressure oil chamber 201 and the low-pressure oil chamber 202 are reconnected, so that the plunger C301 of the pneumatic control device 3 returns to its original position, thereby causing the valve mechanisms of the pneumatic control device 3 to close, cutting off the output high-pressure air. Finally, the vehicle braking control device 1 loses the pneumatic driving force, and the extension lever 108 resets under the action of the return spring 109.

[0042] See Example 3 Figure 6 This embodiment has the same structure as Embodiment 1, except that the outer side of the sealing plate B111 of the vehicle braking control device 1 is equipped with a retaining ring, and the outer side of the sealing plate B111 is provided with a ring of positioning bosses 141. The components inside the housing are installed from the left side.

Claims

1. A vehicle braking control device, characterized in that: The device includes an outer casing. One end of the casing is fitted with a sealing plate A. Inside the casing is a sliding cavity containing a piston A. A compression spring is installed between the piston A and the sealing plate A. The other end of the casing is fitted with a sealing plate B, which has an outlet. The piston A has an extension shaft in its middle, which extends out of the casing from the outlet. A seal is installed between the extension shaft and the outlet. An air chamber is provided between the sealing plate B and the piston A. The casing has an air inlet communicating with the air chamber, and the outer end of the air inlet is connected to an air valve switch. The extension shaft has a cavity containing an extension rod, which is fitted with a return spring. The restoring force of the return spring causes the extension rod to retract into the extension shaft. The sealing plate A has a plunger housing on the side facing the sliding cavity. The inner end of the plunger housing has a stop surface for limiting the piston or the extension shaft. The plunger housing contains a plunger A, the inner end of which contacts the inner end of the extension rod. The sealing plate A has an oil inlet at the outer end of the plunger A.

2. The vehicle braking control device according to claim 1, characterized in that: The portion of the extension rod located outside the extension shaft is connected to a limiting sleeve.

3. The vehicle braking control device according to claim 1, characterized in that: The outer side of the sealing plate A or sealing plate B is equipped with a retaining ring, and the outer side of the sealing plate A or sealing plate B is provided with a ring of positioning bosses. The retaining ring is engaged between the positioning bosses and the grooves on the inner wall of the outer shell.

4. A vehicle braking control system, characterized by: The vehicle braking control device according to any one of claims 1-3 further includes an air-driven hydraulic plunger pump and an air pressure control device. The air-driven hydraulic plunger pump is provided with a high-pressure oil outlet and a high-pressure air inlet. The high-pressure oil outlet is connected to the oil inlet of the vehicle braking control device. The air pressure control device is provided with an air inlet and an air outlet. A valve mechanism is provided between the air inlet and the air outlet. A compressed air source is connected to the outer end of the air inlet. The air outlet is connected to the high-pressure air inlet of the air-driven hydraulic plunger pump.

5. The vehicle braking control system according to claim 4, characterized in that: The pneumatic hydraulic plunger pump includes a housing with a sliding cavity inside. A plunger B is installed within the sliding cavity. The sliding cavity has an oil inlet on one side of the plunger B and a high-pressure oil outlet on the other. The side of the sliding cavity near the oil inlet is a low-pressure oil chamber, and the side near the high-pressure oil outlet is a high-pressure oil chamber. An operating rod is located on the side of the plunger B closest to the oil inlet. A sealing ring is installed on the side of the sliding cavity near the operating rod. The operating rod extends outward from the inner hole of the sealing ring. An oil passage is provided inside the plunger, connecting the low-pressure oil chamber and the high-pressure oil chamber. A hydraulic valve mechanism is installed within the oil passage. When the plunger is pushed inward to a certain depth by the operating rod, the hydraulic valve mechanism closes the oil passage, thereby increasing the oil pressure in the high-pressure oil chamber. An airtight housing is connected to the side of the housing facing the operating rod. An airtight housing has an air inlet at one end and a piston B is installed inside. A return spring is installed between the piston B and the housing. The outer end of the operating rod is connected to the piston.

6. The vehicle braking control system according to claim 5, characterized in that: The operating lever is movably connected to the piston.

7. The vehicle braking control system according to claim 5, characterized in that: The oil passage includes a stepped hole disposed within the plunger B. The large hole of the stepped hole houses the hydraulic valve mechanism, and the side wall of the small hole of the stepped hole has an oil hole communicating with the low-pressure oil chamber. The hydraulic valve mechanism includes a valve cover installed in the large hole, with a valve stem at one end of the valve cover. The valve stem is smaller than the small hole and passes through the small hole. The inner end of the operating rod has a waist-shaped guide hole arranged radially through it. A limit pin is installed in the waist-shaped guide hole, and one end of the valve stem is fixedly connected to the limit pin. A retaining ring is installed at one end of the large hole, and a return spring is installed between the retaining ring and the valve cover.

8. The vehicle braking control system according to claim 4, characterized in that: The pneumatic control device is equipped with a valve drive mechanism, which includes a plunger C. The outer end of the plunger C is connected to a plunger-type hydraulic control device or a push rod.

9. The vehicle braking control system according to claim 8, characterized in that: The plunger-type hydraulic control device includes a housing with a sliding cavity inside. A plunger D is installed at one end of the sliding cavity. The sliding cavity has an oil inlet on one side of the plunger D and an oil outlet on the other side. The side of the sliding cavity with the oil inlet is a low-pressure oil cavity, and the side with the oil outlet is a high-pressure oil cavity. An operating rod is provided on the side of the plunger D near the oil inlet. A sealing ring is installed on the side of the sliding cavity with the operating rod. The operating rod extends outward from the inner hole of the sealing ring. An oil passage is provided inside the plunger D, which connects the low-pressure oil cavity and the high-pressure oil cavity. A hydraulic valve mechanism is installed in the oil passage. When the plunger D is pushed inward to a certain depth by the operating rod, the hydraulic valve mechanism closes the oil passage, thereby increasing the oil pressure in the high-pressure oil cavity.

10. The vehicle braking control system according to claim 4, characterized in that: Two seals are installed on the outer wall of piston A and at the output port of sealing plate B. An oil groove is provided between the two seals, and the oil groove is filled with lubricating oil or grease.

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