CN220281360U - Electric control brake booster, valve assembly and brake system - Google Patents

Abstract

The application provides an electrically controlled brake booster, a valve assembly and a brake system. The electrically controlled brake booster includes: the device comprises a piston assembly, a movable armature, a static armature, a buffer coil, a limiting assembly, a travel sensor and/or a speed sensor and a control module, wherein the buffer coil is wound on the static armature and fixedly connected to the limiting assembly, the movable armature is fixedly connected with the piston assembly and is also connected with the magnet assembly, the output end of the travel sensor and/or the speed sensor is connected with the input end of the control module, the output end of the control module is connected with a connecting wire, and the connecting wire is also connected with the buffer coil to form a control loop. The electric control brake booster reduces noise loudness generated by collision between the piston assembly and the limiting assembly in the resetting process, realizes automatic control, improves accuracy and reliability of noise loudness reduction, and improves driving feeling of a driver.

Description

Electric control brake booster, valve assembly and brake system

Technical Field

The application relates to a brake control technology, in particular to an electric control brake booster, a valve assembly and a brake system.

Background

The automobile braking system is an important system for realizing deceleration or parking of an automobile, and mainly comprises a brake pedal, a master cylinder and other parts, a driver can drive the master cylinder to brake by pushing the brake pedal, and the brake pedal is released to return to an initial position again after the braking is completed.

The electric control brake booster is a more intelligent device in an automobile brake system, the motor drives the booster to control automobile brake, when a driver needs to quickly release a brake pedal, the brake pedal quickly returns to an initial position under the action of the electric control brake booster and impacts a limiting component at the initial position, and at the moment, a master cylinder in the electric control brake booster can generate impact noise with the limiting component.

In the prior art, the original position of the master cylinder is added with materials such as a buffer pad to change the tone of the impact noise, and the loudness of the impact sound generated by the master cylinder is not changed, so that the driving feeling of a driver is reduced.

Disclosure of Invention

The application provides an automatically controlled brake booster, valve assembly and braking system for reduce the speed when master cylinder and spacing subassembly collide among the automatically controlled brake booster, thereby reduce the noise that the collision produced, promote driver's driving impression.

In a first aspect, the present application provides an electronically controlled brake booster comprising: the valve comprises a valve body assembly, a piston assembly, a return spring, a movable armature, a static armature, a buffer coil and a limiting assembly;

the piston assembly is mechanically connected with the brake pedal, a piston cavity is arranged in the valve body assembly, the return spring is positioned in the piston cavity, and one end of the piston assembly is positioned in the piston cavity, so that the return spring is sealed in the piston cavity;

the movable armature is positioned at the other end of the piston assembly, and the static armature is positioned on the limiting assembly; the static armature is wound with a buffer coil which is connected with a power supply.

Optionally, the spacing assembly includes: a piston limit cover and a buffer ring;

the bottom of the piston limiting cover is fixedly connected with the side face of the valve body assembly, the top of the piston limiting cover is provided with an opening, and the buffer ring is installed on the opening.

Optionally, the electrically controlled brake booster comprises a connecting wire; the connecting wire is connected with the buffer coil electricity, and the connecting wire is arranged in the inner wall or the inside of the piston limiting cover.

Optionally, the electric control brake booster further comprises a control module, and an output end of the control module is connected with the connecting wire.

Optionally, the electric control brake booster further comprises a stroke sensor and/or a speed sensor, wherein the stroke sensor and/or the speed sensor is/are positioned in the valve body assembly, and the output end of the stroke sensor and/or the output end of the speed sensor are/is connected with the input end of the control module.

Optionally, the piston assembly comprises: a master cylinder pushrod and a master cylinder piston;

one end of the main cylinder piston is provided with a push rod mounting seat, one end of the main cylinder push rod is fixedly connected in the push rod mounting seat, and the other end of the main cylinder push rod is used for mechanically connecting a brake pedal.

Optionally, a spring cavity is arranged at the other end of the master cylinder piston, and a return spring is positioned in the spring cavity.

Optionally, the electrically controlled brake booster further comprises: a magnet assembly;

one end of the magnet assembly is fixedly connected with the movable armature, and the magnet assembly is also connected with the piston assembly.

In a second aspect, the present application provides a valve assembly comprising an electrically controlled brake booster and cylinder of any one of the first aspects;

the valve body assembly is positioned in the cylinder body and moves in the cylinder body under the pushing of the piston assembly and the return spring.

In a third aspect, the present application provides a brake system comprising a pipeline, a wheel-side brake actuator and a valve assembly of the second aspect.

The application provides an automatically controlled brake booster, valve assembly and braking system, through connecting the master cylinder piston with the movable armature, connect the piston limiting cover with quiet armature, and be connected with buffer coil through winding buffer coil on the quiet armature, pass through the output of connecting wire connection control module with buffer coil again, after the circuit is put through, according to the velocity of movement, direction of movement and the motion stroke of travel sensor and/or speed sensor receipt piston assembly, control module's control end is connected to travel sensor and/or speed sensor's output, control module passes through connecting wire transmission control current to buffer coil and quiet armature, buffer coil and quiet armature produce the magnetic field according to control current, produce with the opposite magnetic attraction of direction of movement between the movable armature, thereby reduce piston assembly's return speed, reduce the noise that collides with spacing subassembly and produce, promote driver's driving impression.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

FIG. 1 is a block diagram of an electrically controlled brake booster according to one embodiment of the present utility model;

FIG. 2 is a schematic diagram of an electronically controlled brake booster speed reduction according to one embodiment of the present utility model;

FIG. 3 is a block diagram of a brake system according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram illustrating a brake system according to an embodiment of the present utility model;

FIG. 5 is a block diagram of a valve assembly according to an embodiment of the present utility model during braking;

fig. 6 is a block diagram of a valve assembly after braking according to an embodiment of the present utility model.

Reference numerals: 101: a valve assembly; 102: a pipeline; 104: a brake pedal; 20: an electric control brake booster; 21: a master cylinder first brake fluid inlet; 22: a master cylinder first brake fluid outlet; 23: a master cylinder second brake fluid inlet; 24: a master cylinder second brake fluid outlet; 25: a cylinder; 26: brake fluid inlet of electric booster cylinder; 27: brake fluid outlet of the electric booster cylinder; 28: a left front wheel brake fluid outlet; 29: a right front wheel brake fluid outlet; 210: a right rear wheel brake fluid outlet; 211: a left rear wheel brake fluid outlet; 212: an electric control pressure building component; 213: an electric pressurizing piston; 214: a pedal travel assembly; 215: a brake fluid chamber; 216: wheel side brake actuating mechanism; 201: a master cylinder push rod; 202: a first piston assembly; 203: a master cylinder first piston return spring; 204: a second piston assembly; 205: a master cylinder second piston return spring; 206: a master cylinder chamber; 207: a master cylinder two chamber; 302: a buffer ring; 303: a piston limit cover; 304: a static armature; 305: a buffer coil; 306: a moving armature; 307: a master cylinder piston; 308: a connecting wire; 309: a piston cavity; 3010: a return spring; 3011: a magnet assembly; 3012: an auxiliary sealing ring; 3013: a main seal ring; 3014: a travel sensor and/or a speed sensor; 3015: a valve body; 3016: a spring cavity; 3017: and a push rod mounting seat.

Specific embodiments thereof have been shown by way of example in the drawings and will herein be described in more detail. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.

It should be noted that, the user information (including but not limited to user equipment information, user personal information, etc.) and the data (including but not limited to data for analysis, stored data, presented data, etc.) related to the present application are information and data authorized by the user or fully authorized by each party, and the collection, use and processing of the related data need to comply with the related laws and regulations and standards of the related country and region, and provide corresponding operation entries for the user to select authorization or rejection.

The terms first, second, third, fourth and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged where appropriate. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope herein.

The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context.

Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise.

It will be further understood that the terms "comprises," "comprising," "includes," and/or "including" specify the presence of stated features, steps, operations, elements, components, species, and/or groups, but do not preclude the presence, presence or addition of one or more other features, steps, operations, elements, components, species, and/or groups.

The terms "or" and/or "as used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a, A is as follows; b, a step of preparing a composite material; c, performing operation; a and B; a and C; b and C; A. b and C). An exception to this definition will occur only when a combination of elements, functions, steps or operations are in some way inherently mutually exclusive.

The automobile braking system comprises a brake pedal and a booster, and a driver can make the automatic pedal advance and return through stepping on the brake pedal, so that the booster is controlled to move to realize the braking of the automobile. The booster mainly comprises a traditional vacuum booster and an electric control brake booster, wherein the traditional vacuum booster mainly comprises a valve body, a sealing ring, an atmosphere chamber, a piston assembly, a limiting assembly and the like, and when a driver presses a brake pedal, force is transmitted to the vacuum booster, the vacuum booster brakes through a vacuum source provided by the atmosphere chamber. The electric control brake booster mainly comprises a valve body, a sealing ring, a control module, a motor, a piston assembly, a limiting assembly and the like, optimizes the vacuum booster into motor boosting, pushes a brake piston to establish brake hydraulic pressure through the motor, and generates braking force through a brake to brake an automobile, so that the dependence of the vacuum booster on a vacuum source is optimized, the number of parts such as a vacuum pump, a vacuum tube and the like is reduced, and the cost is saved.

When the brake pedal is quickly released by the foot of a driver after the automobile is braked, the master cylinder piston in the booster can strike physical limit to generate striking sound when the brake pedal quickly returns to the initial position under the action of the booster. In order to solve the problem that working noise generated by automobile braking improves driving feeling of a driver, in the return process of a traditional vacuum booster, the return of a main cylinder is hindered by means of the friction force between a valve body and a sealing ring, the return of vacuum in an atmosphere cavity and the like, so that the return speed of the main cylinder of the vacuum booster is reduced, the speed of the main cylinder and the speed of the valve body returning to an initial position are relatively low, the generated impact noise is relatively low, and meanwhile, in order to optimize the return noise, the traditional vacuum booster is subjected to rubber coating buffering on a locking plate in the interior and is buffered by the sealing ring in a thick booster shell.

When the electric control brake booster returns to the initial position, the friction force between the main cylinder and the sealing ring in the electric control brake booster is reduced relative to the vacuum booster, so that the return speed of the main cylinder in the electric control brake booster is higher, and the noise is reduced by adding a plastic buffer pad or an encapsulated metal limit pad at a limit component of the initial position of the main cylinder of the electric control brake booster or a rubber buffer method at a rear shell in order to reduce the noise when the push rod returns to the initial position.

In order to solve the problems, the utility model provides an electric control brake booster. According to the electric control brake booster, the fixed armature and the buffer coil are mechanically connected with the limiting assembly at the initial position, the movable armature is fixedly connected with the piston assembly, magnetic induction intensity is generated after the buffer coil is electrified, magnetic attraction opposite to the movement direction of the piston assembly is generated between the fixed armature and the movable armature, the brake pedal is enhanced to drive the piston assembly to move, and accordingly the return speed of the piston assembly is improved and the noise generated when the piston assembly returns to the limiting assembly at the initial position is reduced.

The technical scheme of the utility model is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.

Fig. 1 is a structural diagram of an electric control brake booster according to an embodiment of the present utility model, and as shown in fig. 1, the electric control brake booster includes: valve body assembly, piston assembly, return spring 3010, moving armature 306, static armature 304, snubber coil 305, and spacing assembly, wherein the valve body assembly includes: valve body 3015 and piston cavity 309, the piston assembly includes: the master cylinder push rod 201 and the master cylinder piston 307, the spacing assembly includes: a buffer ring 302 and a piston retainer 303. The master cylinder piston 307 includes: a spring cavity 3016 and a pushrod mount 3017.

The piston assembly is mechanically connected with the brake pedal, a piston cavity is arranged in the valve body assembly, the return spring is positioned in the piston cavity, one end of the piston assembly is positioned in the piston cavity, the return spring is sealed in the piston cavity, in addition, the movable armature is positioned at the other end of the piston assembly, the static armature is positioned on the limiting assembly, the buffering coil is wound on the static armature, and the buffering coil is connected with a power supply.

More specifically, one end of the master cylinder piston 307 is provided with a push rod mounting seat, one end of the master cylinder push rod 201 is fixedly connected in the push rod mounting seat, and the other end of the master cylinder push rod is used for brake pedal mechanical connection. The valve body assembly is internally provided with a piston cavity, one end of a return spring is fixed in the piston cavity 309, in addition, one end of a master cylinder piston in the piston assembly is provided with a spring cavity, the other end of the return spring is positioned in the spring cavity, and when an automobile brakes, the spring cavity is also positioned in the piston cavity and is used for being contacted with the other end of the return spring in the piston cavity during braking, so that the return spring is sealed in the piston cavity, and the return spring can generate compression deformation to generate elasticity. The bottom of the piston limiting cover 303 in the limiting assembly is fixedly connected to the valve body 3015, an opening is formed in the top of the piston limiting cover, the buffer ring 302 in the limiting assembly is installed on the opening, the outer circle of the piston of the master cylinder in the piston assembly is connected with the movable armature 306, the inner part of the piston limiting cover in the limiting assembly is connected with the static armature 304, the buffer coil 305 is wound on the static armature, and the buffer coil can be connected with a power supply. The electrically controlled booster further includes a connecting wire 308 electrically connected to the buffer coil and disposed on or within the inner wall of the piston limit cap.

In one possible embodiment, after a driver inputs a braking command through a brake pedal, the brake pedal pushes a master cylinder push rod to move forwards, a master cylinder piston fixedly connected with the master cylinder push rod also moves forwards, one end of the master cylinder piston moves to compress a return spring in a spring cavity and then continuously moves forwards under the action of pushing force, so that braking is realized by establishing braking hydraulic pressure through compressed braking fluid, when the driver releases braking, the master cylinder piston and the master cylinder push rod fixedly connected with the master cylinder push rod and a movable armature and a magnet assembly fixedly connected with the master cylinder piston move together in the opposite direction under the action of elastic force, at the moment, a buffer coil is connected with a power supply through a connecting wire, current transmitted by the connecting wire is acquired, a corresponding magnetic field is generated according to the size of the current, and a static armature connected with the buffer coil is transmitted to generate a corresponding magnetic force according to the magnetic field, and when the piston assembly and the movable armature fixedly connected with the piston assembly move to the magnetic field range generated by the buffer coil, the magnetic force generated by the fixed armature interacts with the movable armature to form a magnetic attraction opposite to the movement direction of the movable armature, and the movable armature is blocked from moving armature to the return movement of the movable armature.

The electric control brake booster is characterized in that the movable armature is fixed on the piston assembly, the static armature and the buffer coil are fixedly connected on the limiting assembly, current is input to the buffer coil through the connecting wire, the static armature is driven to generate magnetic force, and magnetic attraction force is generated by the static armature and the movable armature when the current passes through the static armature and the movable armature, so that the piston assembly can be subjected to left magnetic attraction force under the action of the magnetic attraction force generated by the static armature and the movable armature, movement of the piston assembly which returns to the right rapidly due to rightward elasticity of the return spring is hindered, and the size of noise generated by collision between the piston assembly and the limiting assembly is reduced by reducing return speed.

The electrically controlled brake booster also includes a travel and/or speed sensor 3014, a magnet assembly 3011, and a control module, as shown in FIG. 1, located within the valve body assembly. Optionally, the output of the travel sensor and/or the output of the speed sensor is connected to the input of the control module, the output of which is connected to the connecting line, wherein the control module is located on the side of the valve body assembly, which is not shown in the figures.

More specifically, the travel sensor and/or the speed sensor 3014 is located inside the valve body 3015, near the magnet assembly 3011, the upper end side of the magnet assembly is connected to the master cylinder piston, the upper end top surface is connected to the moving armature, the output of the travel sensor and/or the output of the speed sensor is connected to the input of the control module, the output of the control module is connected to the connection line, wherein the control module is not shown in the figures.

In one possible embodiment, when the driver releases the brake pedal, the piston assembly returns under the spring force, and the magnet assembly, due to the connection between the master cylinder piston and the moving armature, follows the return of the piston assembly within a range near the travel sensor and/or the speed sensor, at which point a relative movement relationship is created between the travel sensor and/or the speed sensor and the magnetic field assembly. The magnetic field exists in the magnet assembly, the travel sensor and/or the speed sensor makes cutting magnetic induction line movement in the magnetic field of the magnet assembly in the relative movement process of the travel sensor and/or the speed sensor and the magnetic field assembly, so that the travel sensor and/or the speed sensor acquire magnetic field information of each position in the movement process, travel signals of corresponding positions are determined according to the magnetic field information of each position, movement position and speed information corresponding to the piston assembly are acquired according to the travel signals of the corresponding positions, the movement position and speed information is transmitted to the control module through the input end of the control module, and the control module determines corresponding target control information according to the movement position and speed information and transmits the target control information to the buffer coil and the static armature through the connecting wire to generate target magnetic attraction, so that return of the piston assembly is accurately hindered.

For example: as shown in fig. 2, a schematic diagram of a speed reduction of an electric control brake booster according to an embodiment of the present utility model is provided, a piston assembly feeds back stroke information of the piston assembly to a stroke sensor and/or a speed sensor through a magnet assembly, the stroke sensor and/or the speed sensor obtains the stroke information of a relevant position according to a magnetic field of the magnet assembly, and then sends the stroke information to a control module, the control module determines a target current according to the current stroke information, and transmits the target current to a buffer coil to generate a target magnetic field and a target magnetic attraction force, thereby more precisely controlling a return speed of the piston assembly, wherein the stroke information includes an operation position, an operation direction and speed information of the piston assembly.

The electric control brake booster is characterized in that a stroke sensor and/or a speed sensor is/are arranged at a position near the magnet assembly, the output end of the stroke sensor and/or the speed sensor is/are connected with the input end of the control module, and the output end of the control module is connected with the static armature and the buffer coil, so that the static armature and the buffer coil are driven to generate magnetic attraction to control the return speed of the piston assembly and the movable armature and the magnet assembly connected with the static armature and the buffer coil. Through this connection structure, realized the return speed of the different circumstances of automatic monitoring to accurate calculation target current is used for reducing the return speed under the different circumstances according to current faster return speed, when reducing the loudness of striking noise, realized the automatic control to noise loudness, strengthened the accuracy and the reliability of noise loudness reduction.

Optionally, the piston assembly further comprises a sealing ring, wherein the sealing ring comprises: a secondary seal 3012 and a primary seal 3013. The inner wall of the piston cavity where the master cylinder piston is located is provided with a mounting groove, and the auxiliary sealing ring and the main sealing ring are both positioned in the mounting groove, so that the tightness between the master cylinder piston and the piston cavity is realized.

Fig. 3 is a structural diagram of a brake system according to an embodiment of the present utility model, and the structure of the brake system shown in fig. 3 includes: valve assembly 101, line 102, wheel side brake actuator 216, and brake pedal 104. Wherein the valve assembly comprises an electrically controlled brake booster.

The brake pedal 104 is connected via a line 102 to an input of a valve assembly 101, the output of which is connected via a line to a wheel brake actuator 216 of the motor vehicle. When the driver needs to stop or decelerate, the driver steps on the brake pedal by using a foot, the brake pedal pushes the valve assembly to move forwards, and brake fluid is transmitted to the brake wheel side brake actuating mechanism through the brake pipeline, so that the wheel side brake actuating mechanism drives the tire to brake or decelerate. After braking or decelerating, the driver releases the brake pedal to return the valve assembly, and in the return process, the speed of return movement is reduced by the magnetic attraction force in the electric control brake booster, so that noise caused by return impact is reduced. Optionally, the automobile brakes and returns through the braking system, fig. 4 is a structural connection diagram of the braking system according to an embodiment of the present utility model, and as shown in fig. 4, the braking system structure includes: an electric booster cylinder brake fluid inlet 26, an electric booster cylinder brake fluid outlet 27, a left front wheel brake fluid outlet 28, a right front wheel brake fluid outlet 29, a right rear wheel brake fluid outlet 210, a left rear wheel brake fluid outlet 211, an electric control pressure building assembly 212, an electric booster piston 213, a pedal travel assembly 214, a brake fluid chamber 215, a wheel side brake actuator 216, a master cylinder first brake fluid inlet 21, a master cylinder first brake fluid outlet 22, a master cylinder second brake fluid inlet 23, and a master cylinder second brake fluid outlet 24.

More specifically, as shown in fig. 5 and 6, the valve assembly 101 includes: an electric control brake booster 20, a master cylinder first brake fluid inlet 21, a master cylinder first brake fluid outlet 22, a master cylinder second brake fluid inlet 23, a master cylinder second brake fluid outlet 24, and a cylinder 25.

Alternatively, for ease of description, the subsequent embodiments use 202 in fig. 5 and 6 to describe the first piston assembly and 204 to describe the second piston assembly. The electrically controlled brake booster may include a master cylinder push rod 201 and a first piston assembly 202, the valve assembly further including a master cylinder first piston return spring 203, a second piston assembly 204, a master cylinder second piston return spring 205, a master cylinder first chamber 206 and a master cylinder second chamber 207.

The brake pedal is connected with the valve assembly through the pedal travel assembly, the upper end of the valve assembly is connected with the brake fluid cavity through a first brake fluid inlet of the master cylinder and a second brake fluid inlet of the master cylinder, the lower end of the valve assembly is respectively connected with the left front wheel brake fluid outlet and the right rear wheel brake fluid outlet through a first brake fluid outlet of the master cylinder, and the valve assembly is also respectively connected with the left rear wheel brake fluid outlet and the right front wheel brake fluid outlet through a second brake fluid outlet of the master cylinder. The first brake fluid outlet of the master cylinder and the second brake fluid outlet of the master cylinder are connected with the brake fluid cavity through the brake fluid inlet of the electric pressurizing cylinder, and are also connected with the electric pressurizing piston through the brake fluid outlet of the electric pressurizing cylinder, and the other end of the electric pressurizing piston is connected with the electric control pressure building assembly. The left front wheel brake fluid outlet, the right front wheel brake fluid outlet, the left rear wheel brake fluid outlet and the right rear wheel brake fluid outlet are also used for connecting a wheel side brake actuating mechanism through pipelines.

Optionally, the master cylinder push rod is connected with the first piston assembly, the first piston assembly is connected with the second piston assembly through the master cylinder first piston return spring, the second piston assembly is connected to the bottom of the cylinder body through the master cylinder second piston return spring, the first piston assembly and the second piston assembly are located in the cylinder body, and the first piston assembly and the second piston assembly move in the cylinder body under the pushing of the master cylinder push rod and the return spring. The first brake fluid inlet of the master cylinder, the first brake fluid outlet of the master cylinder, the second brake fluid inlet of the master cylinder and the second brake fluid outlet of the master cylinder are positioned around the cylinder body.

In one possible embodiment, when the vehicle is running normally, as shown in fig. 4, after the brake pedal pushes the valve assembly to move forward as shown in fig. 5, brake fluid flows into the first and second master cylinder chambers of the valve assembly through the first and second master cylinder inlets, and as the master cylinder pushrod moves forward, a master cylinder brake fluid pressure is established in the first and second master cylinder chambers of the valve assembly, and then flows into the left front wheel brake fluid outlet, the right front wheel brake fluid outlet, the left rear wheel brake fluid outlet, and the right rear wheel brake fluid outlet through the first and second master cylinder outlets, thereby achieving simulation of the braking or brake pedal effect of the vehicle.

In one possible embodiment, when the driver applies a brake by stepping on the brake pedal, the brake pedal applies a thrust force to the piston assembly by pushing the driver, as shown in fig. 5, the master cylinder push rod 201 advances by the thrust force, the master cylinder first piston 202 advances, the master cylinder first piston return spring 203 is compressed, when the front-end master cylinder first piston brake fluid inlet 21 is closed, the master cylinder first chamber 206 establishes a master cylinder first chamber hydraulic pressure, the master cylinder second piston 204 advances by the master cylinder first piston return spring and the master cylinder first chamber hydraulic pressure, the master cylinder second piston return spring 205 is compressed while closing the master cylinder second brake fluid inlet 23, the master cylinder second chamber establishes a master cylinder second chamber hydraulic pressure, and the simulation of the braking or brake pedal effect of the automobile is realized by the master cylinder first chamber hydraulic pressure and the master cylinder second chamber hydraulic pressure.

In one possible embodiment, when the brake is released after the automobile is stopped to complete the whole braking process of the automobile, and when the driver releases the brake pedal, as shown in fig. 6, after the pushing force of the master cylinder push rod is removed, the master cylinder second piston 204 returns under the action of the master cylinder second piston return spring elastic force 205, and pushes the master cylinder first piston return spring 203 and the connected master cylinder first piston 202 to return to the original position, and when the original position is returned, the non-pressurized brake fluid normally flows between the master cylinder first piston brake fluid inlet 21 and the master cylinder first piston brake fluid outlet 22 and between the master cylinder second piston brake fluid inlet 23 and the master cylinder second piston brake fluid outlet 24.

Optionally, electric booster cylinder brake fluid flows into the electric booster cylinder through the electric booster cylinder brake fluid inlet, when the brake pedal inputs a travel signal to the travel sensor and/or the speed sensor through the pedal travel assembly, the travel sensor and/or the speed sensor inputs the travel signal to the control module, the electric control pressure building assembly establishes electric booster cylinder brake fluid pressure according to the travel signal input by the control module, and the brake fluid pressure is transmitted to the wheel brake executing mechanism through the brake pipeline through the electric booster cylinder brake fluid outlet to realize automobile braking.

In the braking system of the application, a driver pushes the valve assembly to move forwards through pushing the brake pedal, so that brake fluid is driven to brake an automobile, the valve assembly returns through releasing the brake pedal after braking, in the returning process, the static armature is arranged in the electric control brake booster to be connected with the limiting assembly, the movable armature is connected with the piston assembly, the return motion of the piston assembly is blocked through magnetic attraction force generated between the static armature and the movable armature, the return speed is reduced, and accordingly return impact noise is reduced. The piston assembly is further connected with the magnet assembly, the magnet assembly is located near the stroke sensor and/or the speed sensor, real-time monitoring of movement stroke information of the piston assembly is achieved through connection of the magnet assembly, accordingly return movement of the piston assembly is accurately hindered, and stability and accuracy of noise control are improved.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains.

It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments may be modified or some or all of the technical features may be replaced with equivalents. Such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. An electrically controlled brake booster, comprising: the valve comprises a valve body assembly, a piston assembly, a return spring, a movable armature, a static armature, a buffer coil and a limiting assembly;

the piston assembly is mechanically connected with the brake pedal, a piston cavity is arranged in the valve body assembly, the return spring is positioned in the piston cavity, and one end of the piston assembly is positioned in the piston cavity, so that the return spring is sealed in the piston cavity;

the movable armature is positioned at the other end of the piston assembly, and the static armature is positioned on the limiting assembly; the static armature is wound with the buffer coil, and the buffer coil is connected with a power supply.

2. The electrically controlled brake booster of claim 1 wherein said spacing assembly comprises: a piston limit cover and a buffer ring;

the bottom of the piston limiting cover is fixedly connected with the side face of the valve body assembly, an opening is formed in the top of the piston limiting cover, and the buffer ring is installed on the opening.

3. An electrically controlled brake booster according to claim 2, wherein the electrically controlled brake booster comprises a connection line; the connecting wire is electrically connected with the buffer coil, and the connecting wire is arranged on the inner wall or inside the piston limiting cover.

4. An electrically controlled brake booster according to claim 3, further comprising a control module, an output of the control module being connected to the connection line.

5. An electrically controlled brake booster according to claim 4 further comprising a travel sensor and/or a speed sensor located within the valve body assembly, an output of the travel sensor and/or an output of the speed sensor being connected to an input of the control module.

6. The electrically controlled brake booster of claim 1 wherein said piston assembly includes: a master cylinder pushrod and a master cylinder piston;

one end of the main cylinder piston is provided with a push rod mounting seat, one end of the main cylinder push rod is fixedly connected in the push rod mounting seat, and the other end of the main cylinder push rod is used for mechanically connecting the brake pedal.

7. The electrically controlled brake booster of claim 6 wherein the other end of the master cylinder piston is provided with a spring cavity, the return spring being located within the spring cavity.

8. The electrically controlled brake booster of claim 5, further comprising: a magnet assembly;

one end of the magnet assembly is fixedly connected with the movable armature, and the magnet assembly is also connected with the piston assembly.

9. A valve assembly comprising an electrically controlled brake booster and cylinder as claimed in any one of claims 1 to 8;

the valve body assembly is positioned in the cylinder body, and moves in the cylinder body under the pushing of the piston assembly and the return spring.

10. A brake system comprising a conduit, a wheel-side brake actuator, and the valve assembly of claim 9.