CN107757591B - Electronic control brake power assisting system and vehicle brake system - Google Patents
Electronic control brake power assisting system and vehicle brake system Download PDFInfo
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- CN107757591B CN107757591B CN201610703144.2A CN201610703144A CN107757591B CN 107757591 B CN107757591 B CN 107757591B CN 201610703144 A CN201610703144 A CN 201610703144A CN 107757591 B CN107757591 B CN 107757591B
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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
- B60T13/10—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 fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
Abstract
The invention discloses an electronic control brake power-assisted system, which relates to the field of vehicle brake systems and comprises a pedal simulator, an electronic control unit, a driving motor and a power-assisted brake cylinder, wherein the pedal simulator is constructed to be integrated with a brake master cylinder, and a pedal simulator cylinder body is used as a piston of the brake master cylinder; the output end of the driving motor is connected with a planetary gear speed reducing mechanism, and the planetary gear speed reducing mechanism is connected with the power-assisted brake cylinder through a rack; under a normal braking working mode, the pedal simulator absorbs the stroke of a brake pedal push rod, the electronic control unit sends an operation instruction to the driving motor according to the stroke of the pedal push rod, and the piston of the power-assisted brake cylinder is driven to generate brake pressure through the matching of the planetary gear speed reducing mechanism and the rack, so that the braking of the vehicle is realized.
Description
Technical Field
The invention relates to the field of vehicle braking systems, in particular to an electric control braking boosting system for an automobile, which is applicable to various motor vehicles, including new energy vehicles such as electric vehicle hybrid power and the like; and to a vehicle braking system incorporating such an electrically controlled brake assist system.
Background
With the breakthrough of new energy vehicle technology, compared with the traditional fuel vehicle, the new energy vehicle has more and more obvious specific advantages and the share of the new energy vehicle also increases year by year. Since the new energy vehicle and the conventional fuel vehicle are different in terms of power driving, some structures or components that can be used in the conventional fuel vehicle are not suitable for the new energy vehicle.
For example, in the field of braking of automobiles, conventional fuel automobiles use a vacuum booster for brake assist, which uses vacuum generated from an intake manifold of an engine as a vacuum source to generate brake assist. In a hybrid electric vehicle in the new energy vehicle, an engine cannot be similar to a traditional fuel vehicle, so that the engine always works to generate a vacuum source, and particularly, a pure electric vehicle does not have the engine and cannot generate the vacuum source by utilizing the engine.
In this regard, a common solution in the industry is to install an electronic vacuum pump on a new energy vehicle to generate a vacuum source to provide braking assistance. However, the problems of the service life, noise, performance and the like of the electronic vacuum pump are brought, and the braking energy recovery function on the new energy vehicle cannot be realized by adopting the mode that the electronic vacuum pump is matched with the vacuum booster. Therefore, an electric control assist system has been developed in the industry, which can realize a conventional brake assist function and also can conveniently realize a brake energy recovery function.
However, the basic principle of the conventional electronic control power-assisted braking system is that mechanical and electronic electrical technologies are adopted to realize motor drive power assistance and driver brake pedal force input so as to jointly generate vehicle braking force. Typical mechanical structures include worm gear, rack and pinion, belt or gear ball screw, etc.
The electric control power-assisted control system is fundamentally characterized in that the brake pedal force of a driver and the brake assistance force of a motor are superposed to realize the brake assistance function, and the brake pedal force and the brake assistance force are coupled in series. This configuration cannot be implemented if more complex braking system functions are to be implemented, such as braking energy recovery.
In addition, the traditional electric control power-assisted control system has the defect of low efficiency due to the adoption of a worm and gear structure; the use of the ball screw has the disadvantage of high requirements on the screw process, which results in high cost.
Disclosure of Invention
The invention aims to provide a novel electronic control brake power-assisting system which is compact in structure and high in working efficiency and can effectively reduce the weight and the cost of the whole electronic control brake power-assisting system.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an electronically controlled brake boosting system, comprising:
the brake pedal simulator comprises a pedal simulator cylinder body which is arranged in a brake master cylinder and serves as a brake master cylinder piston, and a pedal simulator piston which is arranged in the pedal simulator cylinder body and is connected with a brake pedal push rod, brake fluid is filled between the pedal simulator cylinder body and the pedal simulator piston, a brake fluid inlet and outlet hole is formed in the pedal simulator cylinder body and is communicated with a brake fluid pot through a pedal simulator pipeline, and a normally closed electromagnetic valve is arranged on the pedal simulator pipeline;
a brake pedal stroke sensor connected with the brake pedal push rod to sense a stroke signal of the brake pedal push rod;
the electronic control unit is electrically connected with the brake pedal stroke sensor and the normally closed electromagnetic valve, receives a stroke signal of the brake pedal push rod, and sends an instruction signal after operation processing;
the driving motor is electrically connected with the electronic control unit and receives an instruction signal of the electronic control unit to operate so as to output driving force;
the piston of the booster brake cylinder is connected with the output end of the driving motor, brake fluid is filled between the booster brake cylinder and the piston of the booster brake cylinder and is communicated to a vehicle brake wheel through a booster brake cylinder pipeline, and a normally closed electromagnetic valve is arranged on the booster brake cylinder pipeline; wherein the content of the first and second substances,
the electronic control unit receives a stroke signal of the brake pedal push rod and sends a motor driving instruction and an electromagnetic valve working instruction through operation processing, and a normally closed electromagnetic valve on a pipeline of the pedal simulator is opened to enable brake fluid in a cylinder body of the pedal simulator to flow to the brake fluid pot, so that the brake pedal push rod can continue to move; the driving motor operates to push a piston of the power-assisted brake cylinder to move, and brake fluid in the power-assisted brake cylinder is compressed to generate brake pressure; and a normally closed electromagnetic valve on the pipeline of the power-assisted brake cylinder is opened, and brake fluid flows to a brake wheel of the vehicle to generate braking force, so that the vehicle is braked.
Further, according to the electric control brake boosting system provided by the technical scheme of the invention, the output end of the driving motor is connected with a planetary gear speed reducing mechanism, and the planetary gear speed reducing mechanism is connected with the piston of the boosting brake cylinder through a rack.
Further, according to the electric control brake assisting system provided by the technical scheme of the invention, the planetary gear speed reducing mechanism comprises a gear ring, a sun gear, a planetary gear set, a planet carrier gear and a rack pinion, the planetary gear set is connected with the output end of the driving motor through the sun gear, the planetary gear set is installed on the planet carrier and meshed with the sun gear, and the planet carrier gear is installed on the planet carrier to form the output end of the planetary gear speed reducing mechanism.
Further, according to the technical scheme of the invention, an electric control brake boosting system is provided, wherein a planet carrier gear of the planetary gear speed reducing mechanism is meshed with the rack pinion, and the rack pinion is meshed with the rack and is further connected to a piston of the boosting brake cylinder.
Further, according to the technical scheme of the invention, the electrically controlled brake boosting system is provided, wherein the boosting brake cylinder comprises a left front and right rear boosting brake cylinder and a right front and left rear boosting brake cylinder, and the left front and right rear boosting brake cylinder and the right front and left rear boosting brake cylinder are respectively connected to the rack and pinion of the planetary gear reduction mechanism through two oppositely arranged racks.
Further, according to the electrically controlled brake boosting system provided by the technical scheme of the invention, the left front and right rear booster brake cylinders are respectively communicated to the left front wheel brake wheel and the right rear wheel brake wheel through booster brake cylinder pipelines, the right front and left rear booster brake cylinders are respectively communicated to the right front wheel brake wheel and the left rear wheel brake wheel through booster brake cylinder pipelines, and the booster brake cylinder pipelines are respectively provided with a pressure sensor and the normally closed electromagnetic valve.
Furthermore, according to the electric control brake boosting system provided by the technical scheme of the invention, return springs are respectively arranged in the pedal simulator, the left front and right rear boosting brake cylinders and the right front and left rear boosting brake cylinder, and the return springs are connected with pistons in the pedal simulator to realize piston return.
Further, according to the electronic control brake boosting system provided by the technical scheme of the invention, when the electronic control unit senses that the brake pedal is released through the brake pedal stroke sensor, the electronic control unit sends a driving stopping instruction to the driving motor, the brake pedal returns under the action of the return spring of the pedal simulator, the piston of the boosting brake cylinder returns under the action of the return spring, and brake fluid flows back into the boosting brake cylinder to release the braking force.
Further, according to the electric control brake boosting system provided by the technical scheme of the invention, the pedal simulator cylinder body comprises a front end sealing ring arranged at the front end of the periphery of the pedal simulator cylinder body and a rear end sealing ring arranged at the rear end of the periphery of the pedal simulator cylinder body, and a middle annular groove is formed in the peripheral surface between the front end sealing ring and the rear end sealing ring of the pedal simulator cylinder body.
Further, according to the electrically controlled brake boosting system provided by the technical scheme of the invention, the brake fluid inlet and outlet hole of the pedal simulator is configured to communicate with the middle annular groove, so that the brake fluid in the pedal simulator cylinder body is communicated with the brake fluid inlet and outlet hole in the whole pedal stroke range and is controlled by a normally closed electromagnetic valve on a pedal simulator pipeline.
The present invention also provides a vehicle brake system, comprising:
an electrically controlled brake assist system according to any of the preceding claims; and
the brake master cylinder is connected with a brake pedal push rod of the vehicle through the brake pedal simulator serving as a piston of the brake master cylinder, brake fluid is filled in the brake master cylinder and is communicated with a brake wheel of the vehicle through a brake master cylinder pipeline, and a normally open electromagnetic valve is arranged on the brake master cylinder pipeline; the brake master cylinder is also provided with a brake fluid inlet hole and is communicated with the brake fluid pot through a fluid inlet pipeline, and the fluid inlet pipeline is provided with a one-way valve; wherein
When the electronic control brake power-assisted system is in a working state, the electronic control unit sends a closing instruction to enable the normally open electromagnetic valve on the brake main cylinder pipeline to be in a closed state;
when the electronic control brake power-assisted system is in a failure state, the driving motor does not operate, the normally closed electromagnetic valve on the pedal simulator pipeline is kept in a normally closed state, and the brake fluid in the pedal simulator cylinder stops flowing to the brake fluid pot; the brake pedal push rod pushes the pedal simulator cylinder body to move forwards, and brake fluid in the brake master cylinder is compressed; the normally open electromagnetic valve on the brake master cylinder pipeline keeps an open state, and brake fluid flows to a brake wheel of a vehicle to generate braking force, so that the vehicle brake is realized.
Further, according to the vehicle brake system provided by the technical scheme of the invention, a return spring is arranged between the pedal simulator cylinder body and the brake master cylinder, when the brake pedal is released, the pedal simulator returns under the action of the return spring, and brake fluid flows back into the brake master cylinder, so that the brake force is released.
Compared with the prior art, the invention has the beneficial effects that: the electronic control brake power-assisted system is provided with the pedal simulator and adopts the planetary gear speed reducing mechanism, the structure is compact, the efficiency is high, the two independent power-assisted brake cylinders are symmetrically pushed to generate wheel braking force by utilizing the gear-rack conversion, the force of the speed reducing mechanism is symmetrical, the abrasion is uniform, and the noise is low.
Furthermore, the pedal simulator and the brake master cylinder are integrated, and the pedal simulator cylinder is the piston of the brake master cylinder. By adjusting the return spring rate and damping performance of the pedal simulator, different brake pedal feel can be achieved. The whole electric control brake system has a compact structure, and the volume, weight and cost of the module can be effectively controlled while ensuring the functions required by normal braking. In addition, the electronic control braking assisting control system integrates a pedal simulator, so that the braking energy recovery capability of the new energy automobile can be conveniently realized.
Meanwhile, the electric control brake power assisting system can be conveniently matched with a traditional non-ABS (anti-lock brake system) module vehicle, an ABS vehicle and an ESC (electronic stability control) vehicle, and has no influence on the matching of the traditional ABS/ESC module.
Drawings
Fig. 1 is a schematic structural diagram of a vehicle brake system including an electronically controlled brake boosting system according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a planetary gear reduction mechanism included in an electronically controlled brake boosting system shown in fig. 1.
Fig. 3 is a schematic structural view of a brake master cylinder and a pedal simulator included in the vehicle brake system shown in fig. 1.
The reference numerals in fig. 1 are explained as follows.
| Electric control |
1 |
| Pipeline pressure sensor of right front left rear |
2 |
| Normally closed electromagnetic valve for right front left rear booster |
3 |
| Right front left rear |
4 |
| Return spring of right front left rear |
5 |
| Piston of right front left rear |
6 |
| |
7 |
| Right front left rear booster brake cylinder push rod (rack) | 8 |
| |
9 |
| Planetary gear |
10 |
| Left front right rear booster brake cylinder push rod (rack) | 11 |
| Piston of left front right rear |
12 |
| Return spring of left front right rear |
13 |
| Left front right rear |
14 |
| |
15 |
| |
16 |
| Brake |
17 |
| Brake |
18 |
| Normally closed electromagnetic valve for |
19 |
| Pedal |
20 |
| Pedal |
21 |
| Pedal simulator cylinder (brake master cylinder piston) | 22 |
| Brake master cylinder liquid inlet pipeline one- |
23 |
| Return spring of |
24 |
| |
25 |
| Normally closed electromagnetic valve for left front right rear booster |
26 |
| Normally open solenoid valve for brake master cylinder pipeline | 27 |
| Normally open solenoid valve for brake |
28 |
| Pipeline pressure sensor of left front right rear |
29 |
The reference numerals in fig. 2 are explained as follows.
| Planet carrier | 10.1 | Gear ring | 10.2 |
| Planetary gear set | 10.4 | Sun wheel | 10.3 |
| Planet carrier gear | 10.5 | Rack pinion | 10.6 |
The reference numerals in fig. 3 are explained as follows.
| Braking deviceBrake fluid inlet hole of master cylinder | 1.1 |
| Brake fluid inlet and outlet hole of pedal simulator | 1.2 |
| Brake pedal push rod guide block | 1.3 |
| Brake fluid outlet hole of brake master cylinder | 1.4 |
| Pedal simulator sealing ring | 20.1 |
| Front end sealing ring of brake master cylinder piston | 22.1 |
| Brake master cylinder piston middle ring groove | 22.2 |
| Brake master cylinder piston rear end sealing ring | 22.3 |
Detailed Description
The technical solution of the present invention relating to an electrically controlled power assist system and a vehicle brake system will be described in further detail with reference to the accompanying drawings and embodiments.
Referring to fig. 1, a vehicle brake system according to an embodiment of the present invention includes an electronically controlled brake booster system 1, a right front left rear booster cylinder line pressure sensor 2, a right front left rear booster cylinder line normally closed solenoid valve 3, a right front left rear booster cylinder 4, a right front left rear booster cylinder return spring 5, a right front left rear booster cylinder piston 6, a brake fluid pot 7, a right front left rear booster cylinder push rod (rack) 8, a driving motor 9, a planetary gear reduction mechanism 10, a left front right rear booster cylinder push rod (rack) 11, a left front right rear booster cylinder piston 12, a left front right rear booster cylinder return spring 13, a left front right rear booster cylinder 14, an electronic control unit 15, a brake pedal 16, a brake pedal push rod 17, a brake pedal stroke sensor 18, a pedal simulator line normally closed solenoid valve 19, the brake system comprises a pedal simulator piston 20, a pedal simulator return spring 21, a pedal simulator cylinder 22, a brake master cylinder liquid inlet pipeline check valve 23, a brake master cylinder return spring 24, a brake master cylinder 25, a left front right rear booster brake cylinder pipeline normally-closed electromagnetic valve 26, a brake master cylinder pipeline normally-open electromagnetic valve 27 (a normally-open electromagnetic valve I arranged on a left front right rear brake pipeline), a brake master cylinder pipeline normally-open electromagnetic valve 28 (a normally-open electromagnetic valve II arranged on a right front left rear brake pipeline), and a left front right rear booster brake cylinder pipeline pressure sensor 29.
Wherein the brake pedal 16 and the brake pedal push rod 17, both of which may be similar to existing designs, have a small return spring configuration. The structures of the right front and left rear booster cylinder piston, the booster cylinder, and the left front and right rear booster cylinder piston may be similar to the conventional booster cylinder design, and are only schematic diagrams here.
Referring to FIG. 2, a planetary gear reduction mechanism embodying the present invention is illustrated. It comprises a planet carrier 10.1, a ring gear 10.2, a planetary gear set 10.4, a sun gear 10.3, a planet carrier gear 10.5 and a rack and pinion 10.6. The rack pinion 10.6 is respectively meshed with a right front left rear brake cylinder push rod (rack) 8 and a left front right rear brake cylinder push rod (rack) 11 which are symmetrically distributed.
Referring to fig. 3, there is shown a structure of a brake pedal simulator included in the present invention. The brake fluid inlet hole 1.1 of the brake master cylinder, the brake fluid inlet and outlet hole 1.2 of the pedal simulator, the brake pedal push rod guide block 1.3, the brake fluid outlet hole 1.4 of the brake master cylinder, the seal ring 20.1 of the pedal simulator, the seal ring 22.1 at the front end of the piston of the brake master cylinder, the middle annular groove 22.2 of the piston of the brake master cylinder and the seal ring 22.3 at the rear end of the piston of the brake master cylinder are arranged in the brake simulator.
The brake master cylinder piston middle ring groove 22.2 can realize that the pedal simulator cylinder body 22 is in the whole pedal stroke range, and brake fluid in the pedal simulator cylinder body 22 is communicated with the brake fluid inlet and outlet hole 1.2 of the pedal simulator and is controlled by the pedal simulator pipeline normally closed electromagnetic valve 19.
The working modes of the electric control brake power-assisted system provided by the invention comprise a normal state brake mode and a failure state brake mode. These two modes of operation will be described separately below.
First, the normal braking mode, which is a braking mode in the case where the vehicle electrical system is powered normally and the electronic control unit 15 signals monitoring is normal.
In the normal braking mode, when the driver depresses the brake pedal 16, the brake pedal 16 pushes the brake pedal push rod 17 to move, and then the pedal simulator piston 20 to move.
The electronic control unit 15 processes the received travel signal after sensing the displacement of the brake pedal push rod 17 through the brake pedal travel sensor 18.
After the algorithm processing is completed, the electronic control unit 15 sends an opening instruction to the pedal simulator pipeline normally closed electromagnetic valve 19, so that the brake fluid in the pedal simulator cylinder 22 flows to the brake chamber pot 7 through the brake fluid inlet and outlet hole 1.2.
Meanwhile, the electronic control unit 15 sends an opening instruction to the normally closed electromagnetic valve 26 on the left front and right rear brake cylinder pipeline and the normally closed electromagnetic valve 3 on the right front and left rear brake cylinder pipeline, so that the left front and right rear brake cylinder pipeline and the right front and left rear brake cylinder pipeline are communicated with the left front and right rear brake cylinder 14 and the right front and left rear brake cylinder 4.
Meanwhile, the electronic control unit 15 sends a closing instruction to the first normally open solenoid valve 27 and the second normally open solenoid valve 28 on the brake pipeline of the master cylinder, at this time, under the combined action of the check valve 23 on the liquid inlet pipeline of the master cylinder, the brake liquid in the master cylinder 25 is in a closed space and is incompressible, so that the pedal simulator cylinder (master cylinder piston) 22 cannot move forward.
Further, the electronic control unit 15 sends out a motor driving instruction according to an algorithm, the driving motor 9 rotates to generate torque, the planetary gear reduction mechanism 10 reduces the speed and increases the torque, the amplified torque is transmitted to the rack and pinion 10.6, so that the rotation torque is changed into linear thrust, the right front left rear brake cylinder push rod (rack) 8 and the left front right rear brake cylinder push rod (rack) 11 are respectively pushed to move, the right front left rear brake cylinder piston 6 and the left front right rear brake cylinder piston 12 are further pushed to move, finally, brake pressure is generated in the right front left rear brake cylinder 4 and the left front right rear brake cylinder 14, the whole vehicle brake force is generated, and the whole vehicle brake is realized.
In the process, the pedal simulation sensation generated by the pedal simulator piston 20 can be transmitted to the brake pedal 16 via the brake pedal push rod 17 and ultimately to the driver. Wherein varying the stiffness and damping of the brake pedal simulator return spring 21, different simulated brake pedal feel may be obtained.
Two pressure sensors 2 and 26 connected to the left front rear booster brake cylinder pipeline and the right front left rear booster brake cylinder pipeline monitor real booster brake cylinder pipeline pressure in real time and transmit the real booster brake cylinder pipeline pressure to the electronic control unit 15, so that the brake pressure generated by the driving motor 9 meets the brake requirement of the whole vehicle. Meanwhile, when the pipeline leakage is monitored, the whole system enters a safe braking mode state, and the functional safety requirement of the electric control braking system is met.
Further, when the driver releases the pedal, the pedal simulator piston 20 pushes the brake pedal push rod 22 to return under the action of the pedal simulator return spring 21. The pedal stroke sensor 18 outputs a signal for releasing the brake pedal 16 and transmits the signal to the electronic control unit 15.
The electronic control unit cuts off the operation of the driving motor 9, the right front left rear booster brake cylinder piston return spring 5 and the left front right rear booster brake cylinder piston return spring 13 push the right front left rear booster brake cylinder push rod (rack) 8 and the left front right rear booster brake cylinder push rod (rack) 11 to return respectively, so that the booster brake cylinder pipeline pressure is released, and the brake is released.
And secondly, the failure state working mode comprises a braking working mode under the condition that the whole electronic system is powered off and/or the power-assisted driving motor is locked or the driving torque is not provided abnormally.
In this failure mode of operation, the normally closed solenoid valve 19 on the pedal simulator conduit is in a normally closed state, the first normally open solenoid valve 27 and the normally open solenoid valve 28 on the master cylinder conduit are in a normally open state, and the normally closed solenoid valve 3 and the normally closed solenoid valve 26 on the two booster brake cylinder conduits are in a normally closed state. When the driver urgently depresses the brake pedal 16 in the fail-state operation mode, the electronic control unit 15 and the drive motor 9 cannot operate.
In this case, since the normally closed solenoid valve 19 of the pedal simulator is in a closed state, the brake fluid in the pedal simulator cylinder 22 cannot flow to the brake fluid pot 7 through the brake fluid inlet and outlet hole 1.2. The acting force of the brake pedal 16 and the brake pedal push rod 17 is directly transmitted to the pedal simulator piston 20, and since the pedal simulator piston 20 cannot move in the pedal simulator cylinder 22, at this time, the acting force of the brake pedal 16 is directly transmitted to the pedal simulator cylinder 22, that is, the piston of the brake pedal master cylinder, to push the brake pedal master cylinder piston 22 to move forward, so as to compress the brake fluid in the brake master cylinder 25, thereby generating high-pressure brake pressure.
Because the first normally open electromagnetic valve 27 and the second normally open electromagnetic valve 28 on the brake master cylinder pipeline are in an open state, the normally closed electromagnetic valve 3 and the normally closed electromagnetic valve 26 on the booster brake cylinder pipeline are in a normally closed state, the brake pressure of the brake master cylinder 25 directly passes through the brake fluid outlet hole 1.4 of the brake master cylinder and respectively flows to the left front brake wheel, the right rear brake wheel, the right front brake wheel and the left rear brake wheel, and therefore the brake force of the whole vehicle is generated.
When a driver releases a brake pedal, the brake master cylinder return spring 24 pushes the pedal simulator cylinder body (brake master cylinder piston) 22 to return, the check valve 23 on the brake master cylinder liquid inlet pipeline is opened for liquid supplement, the brake pressure in the whole brake master cylinder 25 is released, and the brake pedal is released. Therefore, under the failure mode, the vehicle brake can be realized by the treading acting force of the driver on the brake pedal, so that the vehicle brake safety is ensured.
The electronic control brake power-assisted system provided by the invention adopts the pedal simulator and the planetary gear speed reducing mechanism, has compact structure and high efficiency, symmetrically pushes two independent power-assisted brake cylinders to generate wheel braking force by utilizing gear-rack conversion, and has symmetrical stress, uniform abrasion and low noise of the speed reducing mechanism.
Furthermore, the pedal simulator and the brake master cylinder are integrated, and the pedal simulator cylinder is the piston of the brake master cylinder. By adjusting the return spring rate and damping performance of the pedal simulator, different brake pedal feel can be achieved. The whole electric control brake system has a compact structure, and the volume, weight and cost of the module can be effectively controlled while ensuring the functions required by normal braking. And the electronic control brake power-assisted system integrates a pedal simulator, so that the brake energy recovery capability of the new energy automobile can be conveniently realized.
Finally, the electric control brake boosting system provided by the invention can be conveniently matched with a traditional non-ABS (anti-lock brake system) module vehicle, an ABS vehicle and an ESC (electronic stability control) vehicle, and has no influence on the matching of the traditional ABS/ESC module.
The technical scope of the present invention is not limited to the contents described in the above description, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and these changes and modifications should fall within the scope of the present invention.
Claims (12)
1. An electronically controlled brake boosting system, comprising:
the brake pedal simulator comprises a pedal simulator cylinder body which is arranged in a brake master cylinder and serves as a brake master cylinder piston, and a pedal simulator piston which is arranged in the pedal simulator cylinder body and is connected with a brake pedal push rod, brake fluid is filled between the pedal simulator cylinder body and the pedal simulator piston, the pedal simulator cylinder body is provided with a brake fluid inlet and outlet hole and is communicated with a brake fluid pot through a pedal simulator pipeline, and a normally closed electromagnetic valve is arranged on the pedal simulator pipeline;
a brake pedal stroke sensor connected with the brake pedal push rod to sense a stroke signal of the brake pedal push rod;
the electronic control unit is electrically connected with the brake pedal stroke sensor and the normally closed electromagnetic valve, receives a stroke signal of the brake pedal push rod, and sends an instruction signal after operation processing;
the driving motor is electrically connected with the electronic control unit and receives an instruction signal of the electronic control unit to operate so as to output driving force;
the piston of the booster brake cylinder is connected with the output end of the driving motor, brake fluid is filled between the booster brake cylinder and the piston of the booster brake cylinder and is communicated to a vehicle brake wheel through a booster brake cylinder pipeline, and a normally closed electromagnetic valve is arranged on the booster brake cylinder pipeline; wherein the content of the first and second substances,
the electronic control unit receives a stroke signal of the brake pedal push rod and sends a motor driving instruction and an electromagnetic valve working instruction through operation processing, and a normally closed electromagnetic valve on a pipeline of the pedal simulator is opened to enable brake fluid in a cylinder body of the pedal simulator to flow to the brake fluid pot, so that the brake pedal push rod can continue to move; the driving motor operates to push a piston of the power-assisted brake cylinder to move, and brake fluid in the power-assisted brake cylinder is compressed to generate brake pressure; and a normally closed electromagnetic valve on the pipeline of the power-assisted brake cylinder is opened, and brake fluid flows to a brake wheel of the vehicle to generate braking force, so that the vehicle is braked.
2. An electrically controlled brake boosting system according to claim 1, wherein a planetary gear reduction mechanism is connected to an output of the driving motor, and the planetary gear reduction mechanism is connected to the piston of the booster brake cylinder through a rack.
3. An electronically controlled brake assist system according to claim 2, wherein the planetary gear reduction mechanism includes a ring gear, a sun gear, a planetary gear set, a carrier gear and a rack and pinion gear connected to the output of the drive motor through the sun gear, the planetary gear set being mounted on the carrier and meshing with the sun gear, the carrier gear being mounted on the carrier to constitute the output of the planetary gear reduction mechanism.
4. An electrically controlled brake boosting system according to claim 3, wherein a carrier gear of the planetary gear reduction mechanism meshes with the rack pinion, and the rack pinion meshes with the rack, and is connected to the piston of the booster brake cylinder.
5. An electronically controlled brake assist system according to claim 4, wherein the brake assist cylinder includes a front left and rear right brake assist cylinder and a front right and left rear brake assist cylinder, each connected to the rack and pinion of the planetary gear reduction mechanism by two oppositely disposed racks.
6. An electronically controlled brake boosting system according to claim 5 wherein said left front and right rear brake cylinders are respectively connected to said left front wheel brake wheel and said right rear wheel brake wheel by a brake cylinder line, said right front and left rear brake cylinders are respectively connected to said right front wheel brake wheel and said left rear wheel brake wheel by a brake cylinder line, and said brake cylinder lines are respectively provided with a pressure sensor and said normally closed solenoid valve.
7. An electrically controlled brake boosting system according to claim 6, wherein return springs are respectively arranged in the pedal simulator, the left front and right rear brake cylinders and the right front and left rear brake cylinders, and the return springs are connected with pistons therein to realize piston return.
8. An electronically controlled brake boosting system according to claim 7, wherein when the electronic control unit senses the release of the brake pedal through the brake pedal stroke sensor, the electronic control unit sends a stop driving command to the driving motor, the brake pedal returns under the action of a return spring of the pedal simulator, the piston of the brake booster cylinder returns under the action of the return spring, and the brake fluid returns to the brake booster cylinder to release the braking force.
9. An electrically controlled brake boosting system according to claim 1 or 8, wherein said pedal simulator cylinder includes a front end seal ring provided at a front end of an outer periphery thereof and a rear end seal ring provided at a rear end of the outer periphery thereof, and a middle ring groove is provided on an outer peripheral surface of said pedal simulator cylinder between the front end seal ring and the rear end seal ring.
10. An electronically controlled brake boosting system according to claim 9 wherein said brake fluid inlet and outlet ports of said pedal simulator are configured to communicate with said center annular groove such that brake fluid within said pedal simulator cylinder remains in communication with said brake fluid inlet and outlet ports and is controlled by said normally closed solenoid of said pedal simulator conduit throughout the range of pedal travel.
11. A vehicle braking system, characterized in that it comprises:
an electrically controlled brake boosting system according to any one of claims 1-10;
the brake master cylinder is connected with a brake pedal push rod of the vehicle through the brake pedal simulator serving as a piston of the brake master cylinder, brake fluid is filled in the brake master cylinder and is communicated with a brake wheel of the vehicle through a brake master cylinder pipeline, and a normally open electromagnetic valve is arranged on the brake master cylinder pipeline; the brake master cylinder is also provided with a brake fluid inlet hole and is communicated with the brake fluid pot through a fluid inlet pipeline, and the fluid inlet pipeline is provided with a one-way valve; wherein
When the electronic control brake power-assisted system is in a working state, the electronic control unit sends a closing instruction to enable the normally open electromagnetic valve on the brake main cylinder pipeline to be in a closed state;
when the electronic control brake power-assisted system is in a failure state, the driving motor does not operate, the normally closed electromagnetic valve on the pedal simulator pipeline is kept in a normally closed state, and the brake fluid in the pedal simulator cylinder stops flowing to the brake fluid pot; the brake pedal push rod pushes the pedal simulator cylinder body to move forwards, and brake fluid in the brake master cylinder is compressed; the normally open electromagnetic valve on the brake master cylinder pipeline keeps an open state, and brake fluid flows to a brake wheel of a vehicle to generate braking force, so that the vehicle brake is realized.
12. The vehicle brake system according to claim 11, wherein a return spring is provided between the pedal simulator cylinder and the master cylinder, the pedal simulator is returned by the return spring when the brake pedal is released, and brake fluid flows back into the master cylinder to release the braking force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610703144.2A CN107757591B (en) | 2016-08-23 | 2016-08-23 | Electronic control brake power assisting system and vehicle brake system |
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| Application Number | Priority Date | Filing Date | Title |
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| EP3560776B1 (en) * | 2018-04-26 | 2021-03-10 | Mando Corporation | Electronic brake system and method of operating an electronic brake system |
| CN109177959A (en) * | 2018-09-12 | 2019-01-11 | 石家庄佳信汽车制动系统有限公司 | A kind of mechanical transmission structure of electronics booster |
| CN109204278B (en) * | 2018-10-15 | 2023-06-23 | 瑞立集团瑞安汽车零部件有限公司 | Intelligent brake boosting system driven by motor and controlled by ECU (electronic control unit) and working method thereof |
| CN109910854B (en) * | 2019-03-26 | 2023-11-24 | 吉林大学 | Automobile automatic braking mechanism utilizing vacuum booster and control method thereof |
| CN112224190B (en) | 2019-06-30 | 2023-01-13 | 华为技术有限公司 | Brake boosting system, brake method and electric automobile |
| CN111332128B (en) * | 2020-04-02 | 2022-03-29 | 浙江威格镁汽车科技有限公司 | Electric automobile series motor regenerative braking system and using method thereof |
| CN112339734A (en) * | 2020-11-19 | 2021-02-09 | 宁波拓普集团股份有限公司 | Modular integrated brake-by-wire system |
| CN113788000B (en) * | 2021-10-13 | 2022-05-17 | 南京经纬达汽车科技有限公司 | Fully-decoupled electro-hydraulic servo brake system |
| CN114407850B (en) * | 2021-11-14 | 2023-06-06 | 重庆交通大学 | Unmanned automobile line control brake device |
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| JP2013023006A (en) * | 2011-07-19 | 2013-02-04 | Bosch Corp | Stroke simulator, master cylinder with the stroke simulator, and brake system using the master cylinder |
| JP2015202779A (en) * | 2014-04-14 | 2015-11-16 | 株式会社デンソー | Vehicle brake device |
| KR20150124691A (en) * | 2014-04-29 | 2015-11-06 | 주식회사 만도 | Electro hydraulic brake |
| CN105197002B (en) * | 2014-06-24 | 2018-12-07 | 上海通用汽车有限公司 | Vehicle braking booster and its control method |
| CN204775204U (en) * | 2015-03-27 | 2015-11-18 | 同济大学 | Parallel bar formula full decoupling electron hydraulic braking system |
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