CN110155013B - Integrated hydraulic and mechanical force coupled electric power-assisted brake system - Google Patents
Integrated hydraulic and mechanical force coupled electric power-assisted brake system Download PDFInfo
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- CN110155013B CN110155013B CN201910439345.XA CN201910439345A CN110155013B CN 110155013 B CN110155013 B CN 110155013B CN 201910439345 A CN201910439345 A CN 201910439345A CN 110155013 B CN110155013 B CN 110155013B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/745—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
Abstract
The invention discloses an integrated electric power-assisted brake system with coupling of hydraulic pressure and mechanical force, which comprises a first gear, a second gear, a power-assisted motor, a pedal push rod, a power-assisted pressure building cylinder, a brake main cylinder, a liquid storage tank, a hydraulic control unit and an electric control unit, wherein the first gear, the second gear, the power-assisted motor and the power-assisted pressure building cylinder are assembled in a shell, the power-assisted motor is connected with the first gear and drives the first gear to rotate, the first gear is meshed with the second gear to drive the second gear to synchronously rotate, a screw rod is screwed in the middle of the second gear, the screw rod is of a hollow structure, and the screw rod is driven to move left and right in the rotation process of the second gear, and the integrated electric: the electric power-assisted brake system can implement functions of active braking, failure backup, braking energy recovery and the like, realize intelligent control of the vehicle, and can be used as a bottom actuator of an intelligent automobile driving auxiliary system.
Description
The invention relates to an electric power-assisted brake system, in particular to an integrated hydraulic pressure and mechanical force coupled electric power-assisted brake system.
Background
At present, automobile intellectualization and electromotion are main development trends in the future, and the traditional vacuum boosting type hydraulic brake system cannot meet the requirements. Electro-hydraulic braking (EHB) and electro-mechanical braking (EMB) have also been restricted in development due to high energy consumption, non-failure backup, and other problems. In recent years, electric power-assisted brake systems have become a research hotspot in the brake industry. The electric power-assisted brake system can realize partial decoupling or complete decoupling between the brake pedal and the main cylinder, and ensures that the vehicle has good pedal feel while realizing brake energy recovery. Meanwhile, the electric power-assisted braking system can realize the function of changing the power-assisted ratio by controlling the motor, and can realize automatic braking in emergency by matching with sensors such as a radar and a camera. In summary, the electric power-assisted brake system and the control method thereof are the main stream direction of the intellectualization and the electromotion of the automobile brake system.
Although there are many advantages of electrically assisted brake systems, there is currently a lack of consideration in the art regarding coupling and decoupling of driver braking force and motor braking force. In most schemes, the pedal force of a driver and the assistance of a motor are coupled through a feedback disc, the assistance is controlled by acquiring the inner and outer ring shape variation of the feedback disc through a displacement difference sensor, and a control algorithm is complex. And the decoupling is realized by means of a pedal feeling simulator, the structure is complex, and the pedal feeling is different from the real state. Some electric power-assisted brake systems adopt a complete decoupling scheme, because the pedal feel is simulated by adjusting hardware such as a liquid storage cylinder and a spring, fine electrical components and control algorithms cannot be matched, and in addition, an Electronic Control Unit (ECU) needs to accurately control a plurality of electromagnetic valves, so that the whole hydraulic brake system is high in control difficulty, complex in structure, high in cost and inconvenient to arrange in a real vehicle.
Disclosure of Invention
The invention aims to solve the problems of the conventional vehicle electric power-assisted brake system in the using process and provides an integrated hydraulic pressure and mechanical force coupling electric power-assisted brake system.
The invention provides an integrated electric power-assisted brake system for coupling hydraulic pressure and mechanical force, which comprises a first gear, a second gear, a power-assisted motor, a pedal push rod, a power-assisted pressure building cylinder, a brake master cylinder, a liquid storage tank, a hydraulic control unit and an electric control unit, wherein the first gear, the second gear, the power-assisted motor and the power-assisted pressure building cylinder are assembled in a shell, the power-assisted motor is connected with the first gear and drives the first gear to rotate, the first gear is meshed with the second gear to drive the second gear to synchronously rotate, a screw rod is screwed in the middle of the second gear and is of a hollow structure, the screw rod is driven to move left and right in the rotating process of the second gear, the rear end of the screw rod is connected with a first piston in the power-assisted pressure building cylinder, the screw rod can drive the first piston to move left and right in an inner cavity of the, the pedal push rod penetrates through the side wall of the front end of the shell and then sequentially penetrates through an inner cavity of the lead screw and an inner cavity of the boosting pressure building cylinder, the rear end of the pedal push rod is connected with a second piston in an inner cavity of the brake main cylinder, a first piston in the boosting pressure building cylinder is sleeved on the pedal push rod and is in sliding connection with the pedal push rod, an oil conveying channel is formed in a rear rod body of the pedal push rod, the inner cavity of the boosting pressure building cylinder and the inner cavity of the brake main cylinder are communicated through the oil conveying channel, the liquid storage tank is communicated with the inner cavity of the brake main cylinder and provides hydraulic oil for the brake main cylinder, the hydraulic control unit is also communicated with the inner cavity of the brake main cylinder, the pedal push rod, the hydraulic control unit and the boosting motor are all connected with.
The diameter of first gear is less than the diameter of second gear, and the second gear is fixed in the inner chamber of casing through the mount, and second gear and mount junction are equipped with the bearing, and the front end of lead screw is connected with the link, and the both ends of link are equipped with the slider respectively, and two sliders overlap respectively and establish on two guide posts, and the lead screw removes the in-process and can drive the slider and slide along the guide post.
A first return spring is arranged between the pedal push rod and the side wall of the front end of the shell, a pedal stroke sensor is arranged on a connecting circuit between the pedal push rod and the electric control unit, and the pedal stroke sensor can transmit displacement data of the pedal push rod to the electric control unit in real time.
And a second return spring is assembled at the rear part of the first piston in an inner cavity of the power-assisted pressure building cylinder, and the second return spring is sleeved on the pedal push rod.
The front end of the inner cavity of the brake main cylinder is provided with a sealing sleeve, the sealing sleeve is sleeved on the pedal push rod, the sealing sleeve is in sliding contact with the pedal push rod, a first working cavity is formed between the rear end of the sealing sleeve and the front end of a second piston in the inner cavity of the brake main cylinder, the inner cavity of the boosting pressure building cylinder is communicated with the first working cavity through an oil conveying channel formed in a rod body at the rear part of the pedal push rod, a third piston is further assembled in the inner cavity of the brake main cylinder, a second working cavity is formed between the second piston and the third piston, a third return spring is assembled in the second working cavity, a third working cavity is formed at the rear end of the third piston and the rear end of the inner cavity of the brake main cylinder, a fourth return spring is assembled in the third working cavity, the liquid storage tank is respectively communicated with the second working cavity and the third working cavity through pipelines, the liquid storage tank provides hydraulic oil for the second working cavity and the third working cavity, and the hydraulic control unit is.
A hydraulic pressure sensor is connected to a connecting pipeline of the hydraulic control unit and the brake master cylinder, the hydraulic pressure sensor is connected with the electric control unit, the hydraulic pressure sensor can transmit oil pressure data to the electric control unit in real time, the hydraulic control unit is further connected with a brake wheel cylinder, and the hydraulic control unit controls the work of the brake wheel cylinder.
The boosting motor, the hydraulic control unit, the electric control unit, the pedal stroke sensor, the hydraulic pressure sensor and the brake wheel cylinder are all assembled by existing equipment, and therefore specific models and specifications are not described repeatedly.
The working principle of the invention is as follows:
the integrated electric power-assisted brake system with coupled hydraulic pressure and mechanical force provided by the invention has three working modes of electric power-assisted brake, active brake and failure backup, and specifically comprises the following steps:
firstly, an electric power-assisted braking function:
when the system is in an electric power-assisted braking mode, a driver steps on a brake pedal, a pedal push rod overcomes the resistance of a first return spring to translate rightwards, and the pedal push rod penetrates through a shell, a lead screw inner cavity, a first piston and a sealing sleeve to directly act on a second piston in a brake main cylinder inner cavity, so that the purpose that the brake main cylinder is pressurized by manpower is achieved.
Meanwhile, the pedal stroke sensor acquires the displacement of the pedal push rod and sends a displacement signal to the electronic control unit, and the electronic control unit analyzes the braking intention of the driver according to the pedal stroke information and calculates the total braking force F required by the braking at this timeSFor a new energy automobile, the electric control unit calculates the regenerative braking force F which can be generated by the vehicle at the moment according to the working states of a power motor, a storage battery and the like of the vehicle at the momentRTotal braking force FSSubtracting regenerative braking forceFRThe hydraulic braking force F required by the current braking is obtainedHI.e. FH＝FS-FR. The electric control unit is based on the hydraulic braking force FHThe size of the brake master cylinder is obtained, a power-assisted value required by the power-assisted motor is obtained through the power-assisted characteristic curve, a control instruction is sent to the power-assisted motor, the power-assisted motor generates corresponding rotating speed and torque according to the instruction, an output shaft of the power-assisted motor drives a first gear to drive a second gear to rotate, the second gear rotates to drive a lead screw to translate rightwards to push a first piston to build pressure for the power-assisted pressure building cylinder filled with hydraulic oil, the lead screw translates rightwards but cannot rotate under the action of a guide mechanism, the hydraulic oil builds pressure for a first working cavity of the brake master cylinder filled with the hydraulic oil through an oil conveying channel formed in a rear rod body of a pedal push rod, and the second piston is.
In the process, manpower generated by treading of a pedal by a driver and the assistance of the motor are coupled in a first working cavity in the brake master cylinder.
When a driver looses the brake pedal, the pedal push rod returns under the action of the first return spring, and the electric power-assisted mechanism returns in a reverse direction through the power-assisted motor.
Secondly, an active braking function:
for a vehicle provided with a speed measuring sensor and a distance measuring sensor, when a driver does not step on a brake pedal, namely the pedal travel sensor does not detect a displacement signal, when the speed measuring sensor and the distance measuring sensor measure that the distance between the vehicle and a front obstacle is too short, and a braking measure must be taken to prevent collision or other dangerous behaviors, the electric power-assisted braking system enters an active braking mode.
Under the active braking mode, the electric control unit analyzes signals transmitted by other vehicle-mounted sensors, judges the active braking force required by a vehicle, sends an instruction to the power-assisted motor through the control circuit, the power-assisted motor drives the first gear to drive the second gear to rotate according to the instruction, the second gear drives the lead screw to translate rightwards, so that the first piston is pushed to build pressure for the power-assisted pressure building cylinder, the first working cavity in the brake main cylinder is built pressure through an oil conveying channel arranged on a rod body at the rear part of the pedal push rod, the second piston is pushed to build pressure for the brake main cylinder, and the drive-by-wire active braking is realized. In the active braking mode, once the electronic control unit receives a displacement signal of the pedal stroke sensor, the system is immediately switched into a conventional electric power-assisted braking mode.
Thirdly, a failure backup function:
according to the relevant requirements, when the brake system fails or some brake components are in failure, the brake system still needs to ensure that a certain brake strength can be generated so as to ensure safety and reliability.
The integrated hydraulic pressure and mechanical force coupled electric power-assisted brake system provided by the invention is used when a power-assisted motor or a certain transmission part fails to work normally, so that an electric power-assisted assembly cannot work normally. The system can enter a failure backup working mode, and in the mode, a driver can step on a brake pedal to push a pedal push rod to directly act on the second piston to build pressure for the brake master cylinder, so that the brake system can still generate a certain braking force to realize a failure backup function.
The invention has the beneficial effects that:
the integrated hydraulic pressure and mechanical force coupled electric power-assisted brake system provided by the invention cancels a feedback disc structure, simplifies the control algorithm of the whole brake system, and simultaneously eliminates the potential safety hazard caused by excessive deformation of the reaction disc due to overlarge radial force. The invention adopts the mode that the pedal force of a driver is coupled with the hydraulic pressure generated by the piston pushed by the boosting mechanism, has simple structure, improves the response speed of the system and the control precision of the brake pressure, and can realize the drive-by-wire active brake. Compared with an electronic hydraulic brake system, the scheme of a power-assisted motor and mechanical transmission is adopted, a high-pressure energy accumulator structure is omitted, the hidden liquid leakage danger is reduced, the response speed is higher, the brake pressure control is more accurate, the integration degree of the electric power-assisted brake system is improved, the simultaneous output of the driver brake force and the motor brake force is realized, the mutual interference is avoided, and parts for realizing related functions are reduced as much as possible. Compared with a completely decoupled electronic hydraulic brake system, the pedal decoupling and failure backup are carried out without additionally arranging an electromagnetic valve, and the control difficulty of an Electronic Control Unit (ECU) on the whole system is reduced. In the failure backup mode, the pedal feel simulator is cancelled, so that no idle stroke exists, the response speed is high, the work is more reliable, and a driver can quickly build pressure through the brake pedal to realize vehicle braking. The electric power-assisted brake system can implement functions of active braking, failure backup, braking energy recovery and the like, can effectively integrate active control technologies such as an Electronic Stability Program (ESP), Adaptive Cruise Control (ACC) and the like, realizes intelligent control of vehicles, and can be used as a bottom actuator of an intelligent automobile driving auxiliary system.
Drawings
Fig. 1 is a schematic view of the overall structure of an electric power-assisted brake system according to the present invention.
FIG. 2 is an enlarged view of the connection structure of the pedal push rod and the second piston according to the present invention.
The labels in the above figures are as follows:
1. a first gear 2, a second gear 3, a power-assisted motor 4 and a pedal push rod
5. Boosting pressure building cylinder 6, brake master cylinder 7, liquid storage tank 8 and hydraulic control unit
9. Electronic control unit 10, shell 11, screw rod 12, first piston 13 and second piston
14. Oil delivery channel 15, fixed frame 16, bearing 17, connecting frame 18 and sliding block
19. A guide post 20, a first return spring 21, a pedal stroke sensor 22, a second return spring
23. Sealing sleeve 24, first working chamber 25, third piston 26 and second working chamber
27. Third return spring 28, third working chamber 29, fourth return spring
30. Hydraulic pressure sensor 31, brake wheel cylinder.
Detailed Description
Please refer to fig. 1 to 2:
the invention provides an integrated electric power-assisted brake system for coupling hydraulic pressure and mechanical force, which comprises a first gear 1, a second gear 2, a power-assisted motor 3, a pedal push rod 4, a power-assisted pressure building cylinder 5, a brake master cylinder 6, a liquid storage tank 7, a hydraulic control unit 8 and an electric control unit 9, wherein the first gear 1, the second gear 2, the power-assisted motor 3 and the power-assisted pressure building cylinder 5 are assembled in a shell 10, the power-assisted motor 3 is connected with the first gear 1 and drives the first gear 1 to rotate, the first gear 1 is meshed with the second gear 2 to drive the second gear 2 to synchronously rotate, a lead screw 11 is screwed in the middle of the second gear 2, the lead screw 11 is of a hollow structure, the lead screw 11 is driven to move left and right in the rotation process of the second gear 2, the rear end of the lead screw 11 is connected with a first piston 12 in the power-assisted pressure building cylinder 5, the lead screw 11 can drive the first piston 12 to, the brake master cylinder 6 is connected to the rear part of the boosting pressure building cylinder 5, the pedal push rod 4 penetrates through the side wall of the front end of the shell 10 and then sequentially penetrates through the inner cavity of the screw rod 11 and the inner cavity of the boosting pressure building cylinder 5, the rear end of the pedal push rod 4 is connected with a second piston 13 in the inner cavity of the brake master cylinder 6, a first piston 12 in the boosting pressure building cylinder 5 is sleeved on the pedal push rod 4, the first piston 12 is connected with the pedal push rod 4 in a sliding manner, an oil conveying channel 14 is formed in the rear rod body of the pedal push rod 4, the inner cavity of the boosting pressure building cylinder 5 is communicated with the inner cavity of the brake master cylinder 6 through the oil conveying channel 14, the liquid storage tank 7 is communicated with the inner cavity of the brake master cylinder 6, the liquid storage tank 7 provides hydraulic oil for the brake, the hydraulic control unit 8 and the power-assisted motor 3 are both connected with the electric control unit 9, and the electric control unit 9 controls the work of the power-assisted motor 3 and the hydraulic control unit 8.
The diameter of the first gear 1 is smaller than that of the second gear 2, the second gear 2 is fixed in the inner cavity of the shell 10 through the fixing frame 15, a bearing 16 is assembled at the joint of the second gear 2 and the fixing frame 15, the front end of the screw rod 11 is connected with the connecting frame 17, the two ends of the connecting frame 17 are respectively assembled with the sliding blocks 18, the two sliding blocks 18 are respectively sleeved on the two guide posts 19, and the sliding blocks 18 can be driven to slide along the guide posts 19 in the moving process of the screw rod 11.
A first return spring 20 is arranged between the pedal push rod 4 and the side wall of the front end of the shell 10, a pedal stroke sensor 21 is arranged on a connecting line between the pedal push rod 4 and the electronic control unit 9, and the pedal stroke sensor 21 can transmit displacement data of the pedal push rod 4 to the electronic control unit 9 in real time.
The second return spring 22 is assembled in the inner cavity of the boosting pressure building cylinder 5 at the rear part of the first piston 12, and the second return spring 22 is sleeved on the pedal push rod 4.
A sealing sleeve 23 is assembled at the front end of an inner cavity of the brake master cylinder 6, the sealing sleeve 23 is sleeved on the pedal push rod 4, the sealing sleeve 23 is in sliding contact with the pedal push rod 4, a first working cavity 24 is formed between the rear end of the sealing sleeve 23 and the front end of a second piston 13 in the inner cavity of the brake master cylinder 6, the inner cavity of the boosting pressure building cylinder 5 is communicated with the first working cavity 24 through an oil conveying channel 14 formed on a rod body at the rear part of the pedal push rod 4, a third piston 25 is also assembled in the inner cavity of the brake master cylinder 6, a second working cavity 26 is formed between the second piston 13 and the third piston 25, a third return spring 27 is assembled in the second working cavity 26, a third working cavity 28 is formed between the rear end of the third piston 25 and the rear end of the inner cavity of the brake master cylinder 6, a fourth return spring 29 is assembled in the third working cavity 28, and the liquid storage tank 7 is respectively communicated with the second working, the reservoir 7 supplies hydraulic oil to the second working chamber 26 and the third working chamber 28, and the hydraulic control unit 8 is also communicated with the second working chamber 26 and the third working chamber 28 respectively through pipelines.
A hydraulic pressure sensor 30 is connected to a connecting pipeline between the hydraulic control unit 8 and the master cylinder 6, the hydraulic pressure sensor 30 is connected with the electronic control unit 9, the hydraulic pressure sensor 30 can transmit oil pressure data to the electronic control unit 9 in real time, the hydraulic control unit 8 is also connected with a brake wheel cylinder 31, and the hydraulic control unit 8 controls the work of the brake wheel cylinder 31.
The boosting motor 3, the hydraulic control unit 8, the electronic control unit 9, the pedal stroke sensor 21, the hydraulic pressure sensor 30 and the brake wheel cylinder 31 are all assembled by existing equipment, and therefore specific models and specifications are not described in detail.
The working principle of the invention is as follows:
the integrated electric power-assisted brake system with coupled hydraulic pressure and mechanical force provided by the invention has three working modes of electric power-assisted brake, active brake and failure backup, and specifically comprises the following steps:
firstly, an electric power-assisted braking function:
when the system is in an electric power-assisted braking mode, a driver steps on a brake pedal, the pedal push rod 4 overcomes the resistance of the first return spring 20 to translate rightwards, and the pedal push rod passes through the shell 10, the inner cavity of the screw rod 11, the first piston 12 and the sealing sleeve 23 to directly act on the second piston 13 in the inner cavity of the brake master cylinder 6, so that the brake master cylinder 6 is pressurized by manpower.
Meanwhile, the pedal stroke sensor 21 collects the displacement of the pedal push rod 4 and sends a displacement signal to the electronic control unit 9, and the electronic control unit 9 analyzes the braking intention of the driver according to the pedal stroke information and calculates the total braking force F required by the braking at this timeSFor a new energy automobile, the electronic control unit 9 calculates the regenerative braking force F that can be generated by the vehicle at that time according to the operating states of the power motor, the storage battery, and the like of the vehicle at that timeRTotal braking force FSSubtracting the regenerative braking force FRThe hydraulic braking force F required by the current braking is obtainedHI.e. FH＝FS-FR. The electronic control unit 9 is based on the hydraulic braking force FHThe magnitude of the pressure difference between the two hydraulic oil pressure values is obtained through the power-assisted characteristic curve, the control instruction is sent to the power-assisted motor 3, the power-assisted motor 3 generates corresponding rotating speed and torque according to the instruction, an output shaft of the power-assisted motor 3 drives the first gear 1 to drive the second gear 2 to rotate, the second gear 2 rotates to drive the screw rod 11 to translate rightwards to push the first piston 12 to build pressure for the power-assisted pressure building cylinder 5 filled with hydraulic oil, the screw rod 11 translates rightwards but cannot rotate under the action of the guide mechanism, the hydraulic oil builds pressure for the first working cavity 24 of the brake master cylinder 6 filled with the hydraulic oil through the oil conveying channel 14 formed in the rear rod body of the pedal push rod 4, and the second piston 13 is pushed to realize the electric power-assisted pressure.
The manual force generated by the driver pedaling during this process is coupled with the motor assist in a first working chamber 24 in the master cylinder.
When a driver releases a brake pedal, the pedal push rod 4 returns under the action of the first return spring 20, and the electric power-assisted mechanism reversely returns through the power-assisted motor 3.
Secondly, an active braking function:
for a vehicle provided with a speed measuring sensor and a distance measuring sensor, when a driver does not step on a brake pedal, namely the pedal travel sensor does not detect a displacement signal, when the speed measuring sensor and the distance measuring sensor measure that the distance between the vehicle and a front obstacle is too short, and a braking measure must be taken to prevent collision or other dangerous behaviors, the electric power-assisted braking system enters an active braking mode.
In an active braking mode, the electronic control unit 9 analyzes signals transmitted by other vehicle-mounted sensors, judges active braking force required by a vehicle, and sends an instruction to the power-assisted motor 3 through the control circuit, the power-assisted motor 3 drives the first gear 1 to drive the second gear 2 to rotate according to the instruction, the second gear 2 drives the screw rod 11 to translate rightwards, so that the first piston 12 is pushed to build pressure for the power-assisted pressure building cylinder 5, the first working cavity 24 in the brake master cylinder 6 is built pressure through the oil conveying channel 14 formed in the rear rod body of the pedal push rod 4, the second piston 13 is pushed to build pressure for the brake master cylinder 6, and drive-by-wire active braking is achieved. In the active braking mode, as soon as the electronic control unit 9 receives the displacement signal of the pedal stroke sensor 21, the system switches to the conventional electric power-assisted braking mode.
Thirdly, a failure backup function:
according to the relevant requirements, when the brake system fails or some brake components are in failure, the brake system still needs to ensure that a certain brake strength can be generated so as to ensure safety and reliability.
The electric power-assisted braking system without the partial decoupling of the feedback plate provided by the invention is used when the power-assisted motor 3 or a certain transmission part fails to work normally, so that the electric power-assisted assembly cannot work normally. The system can enter a failure backup working mode, and in the mode, a driver can step on a brake pedal to push a pedal push rod 4 to directly act on a second piston 13 to build pressure for a brake main cylinder 6, so that the brake system can still generate certain braking force to realize a failure backup function.
Claims (5)
1. An integrated electric power-assisted brake system with hydraulic pressure and mechanical force coupling comprises a first gear, a second gear, a power-assisted motor, a pedal push rod, a power-assisted pressure building cylinder, a brake master cylinder, a liquid storage tank, a hydraulic control unit and an electric control unit, wherein the first gear, the second gear, the power-assisted motor and the power-assisted pressure building cylinder are assembled in a shell, the power-assisted motor is connected with the first gear and drives the first gear to rotate, the first gear is meshed with the second gear to drive the second gear to synchronously rotate, a lead screw is screwed in the middle of the second gear and is of a hollow structure, the lead screw is driven to move left and right in the rotating process of the second gear, the rear end of the lead screw is connected with a first piston in the power-assisted pressure building cylinder, the lead screw can drive the first piston to move left and right in an inner cavity of the power-assisted pressure, the method is characterized in that: the pedal push rod penetrates through the side wall of the front end of the shell and then sequentially penetrates through an inner cavity of the screw rod and an inner cavity of the boosting pressure building cylinder, the rear end of the pedal push rod is connected with a second piston in the inner cavity of the brake main cylinder, a first piston in the boosting pressure building cylinder is sleeved on the pedal push rod and is in sliding connection with the pedal push rod, an oil conveying channel is formed in a rear rod body of the pedal push rod, the inner cavity of the boosting pressure building cylinder and the inner cavity of the brake main cylinder are communicated through the oil conveying channel, a liquid storage tank is communicated with the inner cavity of the brake main cylinder and provides hydraulic oil for the brake main cylinder, a hydraulic control unit is also communicated with the inner cavity of the brake main cylinder, the pedal push rod, the hydraulic control unit and the boosting motor are all connected with an electric control unit, the electric control unit controls the boosting motor and the hydraulic control unit to work, the diameter of, the bearing is assembled at the joint of the second gear and the fixing frame, the connecting frame is connected to the front end of the screw rod, the sliding blocks are assembled at two ends of the connecting frame respectively, the two sliding blocks are sleeved on the two guide posts respectively, and the sliding blocks can be driven to slide along the guide posts in the moving process of the screw rod.
2. An integrated hydraulic and mechanical force coupled electric power assisted brake system according to claim 1, wherein: a first return spring is arranged between the pedal push rod and the side wall of the front end of the shell, a pedal stroke sensor is arranged on a connecting circuit between the pedal push rod and the electric control unit, and the pedal stroke sensor can transmit displacement data of the pedal push rod to the electric control unit in real time.
3. An integrated hydraulic and mechanical force coupled electric power assisted brake system according to claim 1, wherein: and a second return spring is assembled at the rear part of the first piston in an inner cavity of the power-assisted pressure building cylinder, and the second return spring is sleeved on the pedal push rod.
4. An integrated hydraulic and mechanical force coupled electric power assisted brake system according to claim 1, wherein: the front end of the inner cavity of the brake master cylinder is provided with a sealing sleeve, the sealing sleeve is sleeved on the pedal push rod, the sealing sleeve is in sliding contact with the pedal push rod, a first working cavity is formed between the rear end of the sealing sleeve and the front end of a second piston in the inner cavity of the brake master cylinder, the inner cavity of the boosting pressure building cylinder is communicated with the first working cavity through an oil conveying channel formed in a rod body at the rear part of the pedal push rod, a third piston is further assembled in the inner cavity of the brake master cylinder, a second working cavity is formed between the second piston and the third piston, a third return spring is assembled in the second working cavity, a third working cavity is formed between the rear end of the third piston and the rear end of the inner cavity of the brake master cylinder, a fourth return spring is assembled in the third working cavity, a liquid storage tank is respectively communicated with the second working cavity and the third working cavity through pipelines, the liquid storage tank is provided for the second working cavity and the third working cavity, and a hydraulic control unit is also respectively communicated.
5. An integrated hydraulic and mechanical force coupled electric power assisted brake system according to claim 1, wherein: the hydraulic control unit is connected with a hydraulic pressure sensor on a connecting pipeline of the brake master cylinder, the hydraulic pressure sensor is connected with an electric control unit, the hydraulic pressure sensor can transmit oil pressure data to the electric control unit in real time, the hydraulic control unit is also connected with a brake wheel cylinder, and the hydraulic control unit controls the work of the brake wheel cylinder.
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| CN201910439345.XA CN110155013B (en) | 2019-05-24 | 2019-05-24 | Integrated hydraulic and mechanical force coupled electric power-assisted brake system |
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| CN201910439345.XA CN110155013B (en) | 2019-05-24 | 2019-05-24 | Integrated hydraulic and mechanical force coupled electric power-assisted brake system |
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| CN110155013B true CN110155013B (en) | 2020-02-28 |
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| CN110576842A (en) * | 2019-09-02 | 2019-12-17 | 上海联芊电子科技有限公司 | brake booster unit, braking system and vehicle |
| CN110562228B (en) * | 2019-09-10 | 2022-04-19 | 武汉理工大学 | Electric hydraulic power-assisted brake system of automobile |
| CN111634191B (en) * | 2020-05-08 | 2021-06-29 | 烟台工程职业技术学院(烟台市技师学院) | Automobile braking energy recycling device for transportation |
| CN112253571B (en) * | 2020-09-22 | 2023-09-29 | 北京精密机电控制设备研究所 | Electromechanical actuator for realizing full-scale, non-full-scale or follow-up function after screw rod is blocked |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104309599A (en) * | 2014-09-26 | 2015-01-28 | 同济大学 | Electro-hydraulic brake system |
| CN105774788A (en) * | 2016-03-04 | 2016-07-20 | 吉林大学 | Electric power-assisted braking system with composite functions |
| CN205440327U (en) * | 2016-03-04 | 2016-08-10 | 吉林大学 | Electronic helping hand braking system with complex function |
| CN109177944B (en) * | 2018-11-02 | 2022-02-22 | 吉林大学 | Hydraulically-coupled electronic hydraulic brake system |
| CN109177946B (en) * | 2018-11-02 | 2019-05-31 | 吉林大学 | A kind of full decoupled formula integrated electronic brake fluid system of reactionless disk |
| CN109624957B (en) * | 2019-02-26 | 2021-03-09 | 吉林大学 | Integrated electric power-assisted brake system with novel coupling mode |
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2019
- 2019-05-24 CN CN201910439345.XA patent/CN110155013B/en active Active
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