CN114802157A - Electronic control booster brake for automobile - Google Patents

Abstract

The invention discloses an automobile electronic control power-assisted brake which comprises a shell, a brake pedal joint, a main transmission mechanism, an auxiliary transmission mechanism, a permanent magnet synchronous direct current motor, an induction mechanism and a brake master cylinder, wherein the main transmission mechanism and/or the auxiliary transmission mechanism transmit the force applied by a driver to step a brake pedal from the brake pedal joint to the brake master cylinder, and the brake master cylinder extrudes hydraulic oil to each brake wheel cylinder of a vehicle by virtue of a driving force to generate a braking force. The scheme does not need to install an additional vacuum source generation system to provide a boosting source, and the electronic controller with the CAN communication module CAN monitor the electronic signals of the corner position sensor inside the motor and the pedal stroke sensor fixed outside the front shell in real time, so that the motivation of a driver CAN be known in time, and the closed-loop control and the rapid and accurate regulation and control of the brake pressure are realized.

Description

Electronic control booster brake for automobile

Technical Field

The invention relates to the field of automobile braking, in particular to an electronic control power-assisted brake for an automobile.

Background

In a traditional automobile, a part for realizing brake boosting is a vacuum boosting brake, the vacuum boosting brake cannot work independently, and a vacuum boosting source provided by an internal combustion engine is usually needed to be relied on, so that the braking force applied to a brake pedal by a driver can be amplified to form enough braking force for decelerating the automobile. Meanwhile, a set of vacuum source generating system is usually additionally installed on the vacuum power brake to provide a power source, so that the vacuum power brake occupies extra vehicle space, is low in efficiency, increases the whole vehicle assembly process and cost, is high in working noise, and reduces driving comfort.

In order to adapt to a novel pure electric vehicle, the existing improvement scheme is that a motor is used as a driving power assisting source to replace a vacuum power assisting controller, and if the patent name is 'a brake-by-wire device based on direct current motor power assisting', the application number is as follows: 201710494798.3 patent of the invention, use the direct current motor to provide the driving power source, optimize the structure of the braking device reasonably at the same time, make it small, the integration level is high, however, in this scheme, the control of the motor is not directly linked with the movement of the brake pedal, the movement of the brake pedal and the movement of the motor are separated, the motor is apt to have information error or delay while receiving information, meanwhile, in this scheme, realize the transmission and deceleration of the motor power directly through the big and small gears that are engaged with each other, the direct engagement movement of the gear is apt to have problems such as latch and abrasion.

Disclosure of Invention

Therefore, in order to solve the above problems, the present invention provides an electronic control power-assisted brake for an automobile.

The invention is realized by the following technical scheme:

the automobile electronic control power-assisted brake comprises a shell, a brake pedal joint, a main transmission mechanism, an auxiliary transmission mechanism and a brake main cylinder, wherein the main transmission mechanism comprises a brake pedal connecting rod, a pedal ejector rod, a rubber feedback disc, a push rod support and an adjusting push rod which are sequentially arranged between the brake pedal joint and the brake main cylinder along the axial direction;

the main transmission mechanism is connected with an induction mechanism, and the induction mechanism at least comprises a pedal travel sensor in signal connection with an electronic controller;

the auxiliary transmission mechanism comprises a permanent magnet synchronous direct current motor, a synchronous pulley speed reducing mechanism and a hollow ball screw mechanism, the hollow ball screw mechanism comprises a hollow ball screw arranged at the periphery of the pedal ejector rod at intervals and a ball nut arranged at the periphery of the hollow ball screw and matched with the hollow ball screw, the ball nut is limited by the shell to move axially and receives the power of the permanent magnet synchronous direct current motor through the synchronous pulley speed reducing mechanism, the length of the hollow ball screw is smaller than that of the pedal ejector rod, the hollow ball screw is driven by the ball nut to move axially, a guide support is fixed to one section of the hollow ball screw, the guide support is sleeved on the outer side of the pedal ejector rod, and a gasket is arranged between the guide support and the push rod support;

the permanent magnet synchronous direct current motor is in signal connection with the electronic controller.

Preferably, the casing includes procapsid and back casing, permanent magnetism synchronous direct current motor and a support bearing are fixed to be set up in the back casing, induction mechanism with electronic controller is fixed to be set up in the procapsid, the one end that the back casing is close to the brake pedal and connects is still fixed to be provided with the guard wall connecting plate.

Preferably, a spring baffle is arranged at the joint of the brake pedal joint and the brake pedal connecting rod, and the variable-stiffness spring group is arranged between the spring baffle and the protective wall connecting plate.

Preferably, the dustproof rubber sleeve is arranged outside the variable stiffness spring set, one end of the dustproof rubber sleeve is fixed on the spring baffle, and the other end of the dustproof rubber sleeve is fixed on the protective wall connecting plate.

Preferably, the base and the rubber feedback disc of the push rod support are both arranged in the spring tray, the rubber feedback disc is abutted to the base of the push rod support, one end of the reset spring is connected with the spring tray, and the other end of the reset spring is abutted to the inner wall of the front shell.

Preferably, the gasket comprises a gasket main body arranged between the periphery of the rubber feedback disc and the inner wall of the spring tray and a step surface extending to the outside of the spring tray and abutted against the end part of the spring tray, and two ends of the gasket main body are respectively abutted against the push rod support and the guide support.

Preferably, the guide support and the periphery of the spring tray are provided with three semicircular notches at equal angles, and the guide support and the spring tray are connected through three long pins penetrating in the semicircular notches.

Preferably, the synchronous pulley speed reducing mechanism comprises a small synchronous pulley connected with an output shaft of the permanent magnet synchronous direct current motor and a large synchronous pulley connected with the small synchronous pulley through a synchronous toothed belt, and the large synchronous pulley is fixed on the periphery of the ball nut.

Preferably, the induction mechanism further comprises a magnet support arranged on the pedal ejector rod in a penetrating mode, the magnet support is arranged on the portion, extending out of the hollow ball screw mechanism, of the pedal ejector rod in a penetrating mode, magnets are arranged on the magnet support, and the magnets move in the same direction with the pedal ejector rod in guide grooves formed in the front shell along with the magnet support.

Preferably, the brake pedal connecting rod is connected with a pedal ejector rod through a spherical hinge, and the pedal ejector rod is selectively contacted with the rubber feedback disc.

The technical scheme of the invention has the following beneficial effects:

1. the permanent magnet direct current motor is used as a driving power assisting source, an additional vacuum source generating system is not required to be installed to provide the power assisting source, the vehicle space is saved, the installation of vehicle parts of customers is simplified, the working efficiency is improved, the noise is reduced, the driving comfort of the automobile is improved, and meanwhile, the brake is wide in application range and can be suitable for a traditional automobile and also used as a power assisting brake system of a new energy electric automobile without the vacuum power assisting source.

2. Compared with a traditional brush motor, the permanent magnet synchronous direct current motor is longer in service life, meanwhile, an electronic controller with a CAN communication module monitors electronic signals of a corner position sensor inside the motor and a pedal travel sensor fixed outside a front shell in real time, driver motivation CAN be known in time, closed-loop control is achieved, and rapid and accurate regulation and control of brake pressure are achieved.

3. Utilize hollow ball screw mechanism to realize rotary motion and linear motion's conversion, for traditional rack and pinion mechanism, the output of braking force is more steady, and the noise is littleer, and efficiency is higher to wearing and tearing are low between the part, and operating life is long, situations such as latch can not appear.

4. The synchronous toothed belt mechanism is adopted to realize speed reduction, power is transmitted by meshing the toothed belt with the tooth grooves of the wheels, the transmission efficiency is high, no slip is generated, the transmission precision is good, the structure is compact, the occupied space is small, in addition, the synchronous toothed belt has certain elasticity, the transmission is stable, and the buffering and vibration absorption functions are realized.

5. The length of hollow ball screw is less than the length of pedal ejector pin, and the magnet support wears to establish and extends to the part outside hollow ball screw mechanism on the pedal ejector pin, and simultaneously, guide bracket and magnet support clearance set up, and hollow ball screw can not interfere the magnet support with the motion of guide bracket.

6. Three long pins are arranged in the peripheries of the spring tray and the guide support in a penetrating mode, the supporting weight and the guiding effect are achieved, the guide support is prevented from being influenced by the circumferential force of the hollow ball screw, the moving stability is guaranteed, meanwhile, the long pins are only arranged between the spring tray and the guide support, and the occupied space is small.

Drawings

FIG. 1: is a specific structural schematic diagram of an automobile electronic control power-assisted brake.

Detailed Description

In order that the objects, advantages and features of the invention will be more clearly and specifically shown and described, there shall now be shown and explained by way of the following non-limiting illustration of preferred embodiments. The embodiment is only a typical example of the technical solution of the present invention, and all technical solutions formed by adopting equivalent substitutions or equivalent changes fall within the scope of the present invention.

It is also stated that in the description of the schemes, it is to be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In addition, the term "plurality" in this embodiment means two or more unless specifically limited otherwise.

In this case, the "rear" side represents the direction of the output force, and the "front" side represents the direction of the input force.

The invention discloses an automobile electronic control power-assisted brake which comprises a shell, a brake pedal joint 1, a main transmission mechanism, an auxiliary transmission mechanism, a permanent magnet synchronous direct current motor 20, an induction mechanism and a brake master cylinder 15, wherein the main transmission mechanism and/or the auxiliary transmission mechanism transmit the force applied by a driver to step a brake pedal from the brake pedal joint 1 to the brake master cylinder 15, and the brake master cylinder 15 is pushed by a pushing force to extrude hydraulic oil to each brake wheel cylinder of a vehicle to complete braking.

Specifically, the main transmission mechanism comprises a brake pedal connecting rod, a pedal ejector rod 28, a rubber feedback disc 17, a push rod support 16 and an adjusting push rod 14 which are sequentially arranged between a brake pedal joint 1 and a brake master cylinder 15 along the axial direction, the brake pedal joint 1 is in threaded connection with the brake pedal connecting rod, a brake pedal connecting rod 29 is connected with the pedal ejector rod 28 through a spherical hinge, the pedal ejector rod 28 is in selective contact with the rubber feedback disc 17, when the pedal connecting rod is subjected to a treading force from the brake pedal joint 1, the pedal ejector rod 28 moves towards the rubber feedback disc 17 and is abutted against the rubber feedback disc 17, then the push rod support 16 and the adjusting push rod 14 are pushed to move towards the brake master cylinder 15 through the rubber feedback disc 17, the base of the push rod support 16 and the rubber feedback disc 17 are both arranged in a spring tray 19, so that the rubber feedback disc 17 is abutted against and fixed with the base of the push rod support 16, the adjusting push rod 14 is connected with the push rod base through threads, the length of the adjusting push rod 14 and the length of the push rod base are properly adjusted according to the actual size gap after assembly, and the fact that the adjusting push rod 14 can contact and push the brake main cylinder 15 is guaranteed.

Specifically, a variable stiffness spring set 3 is arranged between the brake pedal joint 1 and the shell, and a return spring 13 is arranged outside the push rod support 16 and the adjusting push rod 14.

Specifically, the shell comprises a front shell 22 and a rear shell 25, a protective wall connecting plate 4 is fixedly arranged at one end, close to the brake pedal joint 1, of the rear shell 25, the protective wall connecting plate 4 is fixed with the rear shell 25 through screws, a spring baffle 30 is arranged at the joint of the brake pedal joint 1 and a brake pedal connecting rod, the variable stiffness spring set 3 is arranged between the spring baffle 30 and the protective wall connecting plate, the variable stiffness spring set 3 is composed of at least two spring pieces with different stiffness, when a driver treads a pedal, the brake pedal joint 1 is forced to move towards the direction of the brake master cylinder 15, the spring baffle 30 arranged at the joint of the brake pedal joint 1 and the brake pedal connecting rod also moves towards the direction of the brake master cylinder 15, and the variable stiffness spring set 3 is forced to compress and feeds back elasticity towards the pedal direction, as the brake pedal link 29 is displaced, the spring force is increased as the compression amount of the spring is increased, thereby giving a brake feeling similar to that of a conventional vacuum booster brake to the foot of the driver; after the driver relaxs the footboard, brake pedal connects 1 atress no longer, becomes rate spring unit 3 drive this moment spring baffle 30 resets, because spring baffle 30 with brake pedal connects 1 and brake pedal connecting rod to be connected, footboard ejector pin 28 and brake pedal connecting rod are connected, consequently, it drives simultaneously to become rate spring unit 3 brake pedal connects 1, brake pedal connecting rod and footboard ejector pin 28 and resets.

Specifically, the outside of the variable stiffness spring group 3 is provided with a dustproof rubber sleeve 2, one end of the dustproof rubber sleeve 2 is fixed on the spring baffle 30, the other end of the dustproof rubber sleeve is fixed on the protective wall connecting plate 4, a section of sealing space is formed between the spring baffle 30 and the protective wall connecting plate 4, and meanwhile, the surface of the dustproof rubber sleeve 2 is provided with a fold structure, so that the length of the dustproof rubber sleeve 2 stretches along with the change of the distance between the spring baffle 30 and the protective wall connecting plate 4.

Specifically, one end of the return spring 13 is connected with a spring tray 19, the other end of the return spring is abutted against the inner wall of the front housing 22, a rubber feedback disc 17 is arranged at one end, close to the brake master cylinder 15, in the spring tray 19, the rubber feedback disc 17 is abutted against the base of the push rod support 16, the base of the push rod support 16 is arranged in the spring tray 19, penetrates through the middle of the spring tray 19 and extends towards the direction of the adjusting push rod 14, the return spring 13 is arranged outside the push rod support 16 and the adjusting push rod 14 at intervals and is coaxial with the push rod support 16 and the adjusting push rod 14, and when the spring tray 19 moves towards the brake master cylinder 15, the return spring 13 is stressed and compressed; when the force exerted on the spring tray 19 is removed, the return spring 13 returns the spring tray 19.

Specifically, the main transmission mechanism is connected with an induction mechanism, the induction mechanism is fixed with the front housing 22, specifically, the induction mechanism at least comprises a pedal stroke sensor 11 in signal connection with the electronic controller 12 and a magnet support 9 penetrating through the pedal push rod 28, a magnet 10 is arranged on the magnet support 9, a guide groove parallel to the movement direction of the pedal push rod 28 is arranged in the front housing 22, the magnet support 9 moves along with the pedal push rod 28 and drives the magnet 10 to move in the same direction with the pedal push rod 28 in the guide groove arranged in the front housing 22, and the pedal stroke sensor 11 induces the movement stroke of the magnet 10 in the guide groove and transmits the movement stroke information to the electronic controller 12, so that the movement stroke of the pedal push rod 28 is calculated.

Specifically, the electronic controller 12 is fixed outside the front housing 22, the permanent magnet synchronous dc motor 20 is fixed on the rear housing 25, the electronic controller 12 is in signal connection with the pedal stroke sensor 11 and the corner position sensor inside the permanent magnet synchronous dc motor 20, collects signals of the pedal stroke sensor 11 and the corner position sensor in real time, and simultaneously performs logic analysis and calculation by using a Control Area Network (CAN) communication module contained in the electronic controller 12, the controller starts the permanent magnet synchronous dc motor 20 to work, and then the permanent magnet synchronous dc motor 20 drives the auxiliary transmission mechanism to move, and pushes the push rod base and the adjusting push rod 14 to move towards the brake master cylinder 15, so that the brake master cylinder 15 is pushed by the adjusting push rod 14 to extrude hydraulic oil to each brake cylinder of the vehicle, thereby generating braking force.

Specifically, the auxiliary transmission mechanism includes a synchronous pulley speed reduction mechanism and a hollow ball screw mechanism driven to rotate by a permanent magnet synchronous direct current motor 20.

Specifically, the synchronous pulley speed reducing mechanism comprises a small synchronous pulley 23 connected with an output shaft of the permanent magnet synchronous direct current motor 20 and a large synchronous pulley 7 connected with the small synchronous pulley 23 through a synchronous cog belt 24, the small synchronous pulley 23 is connected with the output shaft of the permanent magnet synchronous direct current motor 20 through a coupler 21, the small synchronous pulley 23, the synchronous cog belt 24 and the large synchronous pulley 7 rotate along with the rotation of the output shaft of the permanent magnet synchronous direct current motor 20, and the large synchronous pulley 7 drives the hollow ball screw mechanism to move.

Specifically, the hollow ball screw mechanism is arranged outside the pedal push rod 28 at intervals to ensure that the hollow ball screw mechanism and the pedal push rod 28 are not affected with each other, the hollow ball screw mechanism comprises a hollow ball screw 27 arranged at the periphery of the pedal push rod 28 at intervals and a ball nut 6 arranged at the periphery of the hollow ball screw 27 and matched with the hollow ball screw, a plurality of steel balls are arranged between the ball nut 6 and the outer surface of the hollow ball screw 27, the ball nut 6 is limited by the shell to move axially and receives the power of the permanent magnet synchronous direct current motor through the synchronous pulley speed reducing mechanism, in the scheme, one end of the ball nut 6 is fixed with an inner hole of the support bearing 5, the length of the hollow ball screw 27 is smaller than that of the pedal push rod 28, the hollow ball screw 27 is driven by the ball nut 6 to move axially, and a guide bracket 8 is fixed at one section of the hollow ball screw 27, the guide support 8 is sleeved on the outer side of the pedal ejector rod 28, a gasket 26 is arranged between the guide support 8 and the push rod support 16, the large synchronous gear is assembled on the periphery of the ball nut 6 in an interference mode, when the permanent magnet synchronous direct current motor 20 receives a signal of the electronic controller 12 and is started, an output shaft of the permanent magnet synchronous direct current motor 20 rotates and simultaneously drives the small synchronous belt wheel 23, the synchronous toothed belt 24 and the large synchronous belt wheel 7 to rotate, the large synchronous belt wheel 7 is driven to decelerate through the synchronous toothed belt 24 to improve torque, the ball nut 6 rotates along with the large synchronous belt wheel 7 arranged on the periphery of the ball nut 6, the ball nut 6 and the hollow ball screw 27 realize motion transmission through steel ball transmission, the rotary motion is converted into linear motion, and the hollow ball screw 27 pushes the gasket 26 and drives the guide support to move towards the brake master cylinder 15, the spring tray 19 moves along with the guide bracket and drives the push rod support 16 fixed on the spring tray 19 and the adjusting push rod 14 connected with the push rod support 16 to move towards the brake main cylinder 15.

Specifically, the gasket 26 is arranged at the periphery of the rubber feedback disc 17 and fixed on the spring tray 19, the gasket 26 includes a gasket main body arranged between the periphery of the rubber feedback disc 17 and the inner wall of the spring tray 19 and a step surface extending to the outside of the spring tray 19 and abutting against the end of the spring tray 19, two ends of the gasket main body abut against the push rod support 16 and the guide bracket 8 respectively, the guide bracket 8 and the periphery of the spring tray 19 are provided with three semicircular notches at equal angles, the guide bracket 8 and the spring tray 19 are connected through three long pins penetrating in the semicircular notches and reciprocate along the length direction of the long pins.

Specifically, the magnet support 9 is arranged in a penetrating manner at a part of the pedal mandril extending out of the hollow ball screw mechanism, a slotted hole for passing through the magnet support 9 is not required to be arranged on the hollow ball screw 27, and the guide support 8 and the magnet support 9 are arranged in a clearance way and do not interfere with each other.

According to the structure of the automobile electronic control power-assisted brake, the following three working modes can be realized:

the first working mode is as follows: ordinary booster brake

This mode is mainly to provide an assist function by driving the auxiliary transmission mechanism by the permanent magnet synchronous dc motor 20, while realizing braking by the main transmission mechanism with the stepping force of the driver as power.

Specifically, when a driver steps on a brake pedal, the brake pedal joint 1 and a brake pedal connecting rod 29 are pushed, a spring baffle 30 is driven to overcome the elasticity of a variable stiffness spring set 3, a pedal ejector 28 is pushed to move forwards, at the moment, a magnet support 9 connected with the pedal ejector 28 moves along with the pedal ejector 28 and drives a magnet 10 fixed on the magnet support 9 to move in a guide groove, at the moment, a pedal stroke sensor 11 senses the linear position change of the magnet 10 and transmits the position signal to an electronic controller 12 in real time, the electronic controller 12 drives a permanent magnet synchronous direct current motor 20 to rotate, an output shaft of the permanent magnet synchronous direct current motor 20 drives a small synchronous belt wheel 23 to rotate and pass through a synchronous toothed belt 24, a large synchronous belt wheel 7 decelerates, after the torque is increased, the large synchronous belt wheel 7 drives a ball nut 6 to rotate and drives a hollow ball screw 27 to move forwards, the screw rod pushes the guide support 8, then pushes the gasket 26, the rubber feedback disc 17, the push rod support 16 and the adjusting push rod 14, overcomes the elastic force of the return spring 13 arranged on the spring tray 19, and then the adjusting push rod 14 drives the brake main cylinder 15 to extrude hydraulic oil to each brake wheel cylinder of the vehicle to generate braking force.

Specifically, the intention of the driver is judged by sensing the linear position change of the magnet 10 through the pedal stroke sensor 11, signals of the corner position sensor and the pedal stroke sensor 11 which are integrated in the permanent magnet synchronous direct current motor 20 are acquired in real time through the electronic controller 12, closed-loop control is performed on the motor after processing and calculation, and the auxiliary transmission mechanism is driven to realize quick and accurate braking assistance, so that the pedal mandril 28 does not need to be in contact with the rubber feedback disk 17, the brake pedal and the motor assistance are completely decoupled at the moment, and the pedal feeling fed back to the driver by the system is not influenced by the motor assistance.

And a second working mode: automatic braking

This mode is primarily intended to assist the vehicle in achieving autonomous brake force output without driver input, such as vehicle automatic emergency braking conditions and the like.

Specifically, when a control system of the vehicle sends a braking command to the electronic controller 12 through a CAN network, a CAN communication module in the controller analyzes and converts the command, the electronic controller 12 performs logic analysis and calculation, the permanent magnet synchronous direct current motor 20 is started to work, the small synchronous belt wheel 23 is driven to rotate, the large synchronous belt wheel 7 decelerates through the synchronous toothed belt 24 to provide torque, the ball nut 6 supported by the support bearing 5 is driven to rotate, the hollow ball screw 27 is driven to move forwards, the screw pushes the guide support 8, the push gasket 26, the rubber feedback disc 17, the push rod support 16 and the adjusting push rod 14 overcome the elastic force of the return spring 13 arranged on the spring tray 19, and finally the adjusting push rod 14 drives the brake master cylinder 15 to extrude hydraulic oil to each brake wheel cylinder of the vehicle to generate braking force.

In the whole process, a driver does not need to tread a brake pedal, the electronic controller 12 can acquire a corner position sensor integrated in the permanent magnet synchronous direct current motor 20 in real time to perform motor closed-loop control, the permanent magnet synchronous direct current motor 20 drives the auxiliary transmission mechanism, and the rapid and accurate braking assistance output is realized.

And a third working mode: safety backup brake

The mode is mainly used for realizing a safety backup function under the condition that electronic and electric components fail due to faults, and at the moment, the motor cannot normally run due to the faults of the electronic controller 12 or the motor and the like.

Specifically, by the driver stepping on the brake pedal, the brake pedal joint 1 and the brake pedal connecting rod 29 are pushed to overcome the elastic force of the variable stiffness spring set 3, then the brake pedal connecting rod 29 pushes the pedal ejector rod 28 to move forwards, the pedal ejector rod 28 contacts the rubber feedback disc 17 and pushes the push rod support 16 and the adjusting push rod 14 to overcome the elastic force of the return spring 13 arranged on the spring tray 19, and finally the brake master cylinder 15 is driven to extrude hydraulic oil to each brake wheel cylinder of the vehicle to generate braking force.

In the whole process, the induction mechanism, the permanent magnet synchronous direct current motor 20 and the auxiliary transmission mechanism are not needed, and the brake is realized only by the treading force of the driver for treading the brake pedal.

The invention has various embodiments, and all technical solutions formed by adopting equivalent transformation or equivalent transformation are within the protection scope of the invention.

Claims (10)

1. Automobile electronic control helping hand stopper includes casing, brake pedal joint, main drive mechanism, auxiliary drive mechanism and brake master cylinder, its characterized in that:

the main transmission mechanism comprises a brake pedal connecting rod, a pedal ejector rod, a rubber feedback disc, a push rod support and an adjusting push rod which are sequentially arranged between a brake pedal joint and a brake main cylinder along the axial direction, a variable-stiffness spring group is arranged between the brake pedal joint and the shell, and reset springs are arranged outside the push rod support and the adjusting push rod;

the main transmission mechanism is connected with an induction mechanism, and the induction mechanism at least comprises a pedal travel sensor in signal connection with an electronic controller;

the auxiliary transmission mechanism comprises a permanent magnet synchronous direct current motor, a synchronous pulley speed reducing mechanism and a hollow ball screw mechanism, the hollow ball screw mechanism comprises a hollow ball screw arranged at the periphery of the pedal ejector rod at intervals and a ball nut arranged at the periphery of the hollow ball screw and matched with the hollow ball screw, the ball nut is limited by the shell to move axially and receives the power of the permanent magnet synchronous direct current motor through the synchronous pulley speed reducing mechanism, the length of the hollow ball screw is smaller than that of the pedal ejector rod, the hollow ball screw is driven by the ball nut to move axially, a guide support is fixed to one section of the hollow ball screw, the guide support is sleeved on the outer side of the pedal ejector rod, and a gasket is arranged between the guide support and the push rod support;

the permanent magnet synchronous direct current motor is in signal connection with the electronic controller.

2. The electronically controlled power assisted brake for vehicles of claim 1, wherein: the casing includes procapsid and back casing, the synchronous DC motor of permanent magnetism and a fixed setting of support bearing are in the back casing, response mechanism with the electronic controller is fixed to be set up in the procapsid, the one end that the back casing is close to the brake pedal and connects is still fixed and is provided with the protection wall connecting plate.

3. The electronically controlled power assisted brake for vehicles of claim 2, wherein: the connecting part of the brake pedal joint and the brake pedal connecting rod is provided with a spring baffle, and the variable-stiffness spring group is arranged between the spring baffle and the protective wall connecting plate.

4. The electronically controlled power assisted brake for vehicles of claim 3, wherein: and a dustproof rubber sleeve is arranged outside the variable-stiffness spring group, one end of the dustproof rubber sleeve is fixed on the spring baffle, and the other end of the dustproof rubber sleeve is fixed on the protective wall connecting plate.

5. The electronically controlled power assisted brake for vehicles of claim 2, wherein: the base and the rubber feedback disc of the push rod support are both arranged in the spring tray, the rubber feedback disc is abutted to the base of the push rod support, one end of the reset spring is connected with the spring tray, and the other end of the reset spring is abutted to the inner wall of the front shell.

6. The electronically controlled power assisted brake for vehicles of claim 5, wherein: the gasket is including setting up the periphery of rubber feedback dish with gasket main part between the inner wall of spring tray and extend to the spring tray is outside, and with the step face of spring tray tip looks butt, the both ends of gasket main part respectively with push rod support and guide bracket looks butt.

7. The electronically controlled power assisted brake for vehicles of claim 6, wherein: the guide support is provided with three semicircular notches at equal angles with the periphery of the spring tray, and the guide support is connected with the spring tray through three long pins penetrating in the semicircular notches.

8. The electronically controlled power assisted brake for vehicles of claim 1, wherein: the synchronous pulley speed reducing mechanism comprises a small synchronous pulley connected with an output shaft of the permanent magnet synchronous direct current motor and a large synchronous pulley connected with the small synchronous pulley through a synchronous toothed belt, and the large synchronous pulley is fixed on the periphery of the ball nut.

9. The electronically controlled power assisted brake for vehicles of claim 2, wherein: the induction mechanism further comprises a magnet support arranged on the pedal ejector rod in a penetrating mode, the magnet support is arranged in a penetrating mode, the pedal ejector rod extends to the part outside the hollow ball screw mechanism, magnets are arranged on the magnet support, and the magnets move in the same direction with the pedal ejector rod in guide grooves formed in the front shell along with the magnet support.

10. The electronically controlled power assisted brake for vehicles of claim 1, wherein: the brake pedal connecting rod is connected with a pedal ejector rod through a spherical hinge, and the pedal ejector rod is selectively contacted with the rubber feedback disc.

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