CN112977383A - Double-booster decoupling type hydraulic braking system - Google Patents
Double-booster decoupling type hydraulic braking system Download PDFInfo
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- CN112977383A CN112977383A CN202110405443.9A CN202110405443A CN112977383A CN 112977383 A CN112977383 A CN 112977383A CN 202110405443 A CN202110405443 A CN 202110405443A CN 112977383 A CN112977383 A CN 112977383A
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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
- 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
- B60T13/12—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 the fluid being liquid
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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
Abstract
The invention relates to a double-booster decoupling type hydraulic braking system which comprises a brake pedal, a brake pedal displacement sensor, a first electric control booster with single-cavity brake master cylinder assembly, a second electric control booster with single-cavity brake master cylinder assembly, an ABS/ESC unit, a front axle brake and a rear axle brake; the brake pedal displacement sensor is connected with a brake pedal, the brake pedal is mechanically connected with a first electric control booster single-cavity brake master cylinder assembly, the first electric control booster single-cavity brake master cylinder assembly is connected with a second electric control booster single-cavity brake master cylinder assembly, the first electric control booster single-cavity brake master cylinder assembly and the second electric control booster single-cavity brake master cylinder assembly are connected with an ABS/ESC unit, and the ABS/ESC unit is connected with a front axle brake and a rear axle brake.
Description
Technical Field
The application relates to the technical field of automobile hydraulic braking systems, in particular to a double-booster decoupling type hydraulic braking system.
Background
Most hydraulic brake vehicles at home and abroad adopt a single booster and a double-cavity brake master cylinder assembly, servo force generated by the booster and pedal force of a driver for treading a brake pedal jointly act on the double-cavity brake master cylinder, pressure generated by the front cavity and the rear cavity of the brake master cylinder is the same, the servo force and the pedal force are distributed to a wheel brake through an anti-lock brake system (ABS for short) or an Electronic Stability control system (ESC for short), and the pressure of a front shaft pipeline and the pressure of a rear shaft pipeline are the same during normal braking except the actions of the ABS and the ESC.
With the popularization of new energy vehicles such as pure electric vehicles, hybrid electric vehicles and the like, in order to realize efficient braking energy recovery by matching with a power motor, the decoupling of the braking pedal force and the system pipeline pressure is often required, and the independent adjustment of the braking force of a front axle and a rear axle is also required.
Therefore, a double-booster decoupling type hydraulic braking system needs to be designed to adapt to the development of new energy automobiles such as pure electric vehicles, hybrid electric vehicles and the like.
Disclosure of Invention
Based on the above, a double-booster decoupling type hydraulic brake system is needed to achieve decoupling of brake pedal force and pipeline pressure and decoupling of front and rear axle pipeline pressure and brake force.
In order to achieve the aim, the invention provides a double-booster decoupling type hydraulic braking system which comprises a brake pedal, a brake pedal displacement sensor, a first electric control booster with single-cavity brake master cylinder assembly, a second electric control booster with single-cavity brake master cylinder assembly, an ABS/ESC unit, a front axle brake and a rear axle brake;
the brake pedal displacement sensor is connected with the brake pedal, the brake pedal is mechanically connected with the first electric control booster belt single-cavity brake master cylinder assembly, the brake pedal displacement sensor is connected with the first electric control booster belt single-cavity brake master cylinder assembly, the first electric control booster belt single-cavity brake master cylinder assembly is connected with the second electric control booster belt single-cavity brake master cylinder assembly, the first electric control booster belt single-cavity brake master cylinder assembly and the second electric control booster belt single-cavity brake master cylinder assembly are connected with the ABS/ESC unit, and the ABS/ESC unit is connected with the front axle brake and the rear axle brake.
In one embodiment, the first electric booster band single chamber brake master cylinder assembly includes: the brake system comprises a first electric control booster, a first single-cavity brake master cylinder assembly and a first pipeline pressure sensor; the first electric control booster is connected with the first single-cavity brake master cylinder assembly, and the first pipeline pressure sensor is connected with the first single-cavity brake master cylinder assembly and the first electric control booster;
the first electric control booster comprises a first electric control booster execution motor and a first electric control booster ECU; the first electronic control booster ECU is connected with the first pipeline pressure sensor, the first electronic control booster ECU is connected with the first electronic control booster execution motor, the first electronic control booster ECU is connected with the brake pedal displacement sensor, and the first electronic control booster execution motor is connected with the first single-cavity brake master cylinder assembly;
the second electric control booster brake master cylinder assembly with the single cavity comprises a second electric control booster, a second single cavity brake master cylinder assembly and a second pipeline pressure sensor; the second electric control booster is connected with the second single-cavity brake master cylinder assembly, and the second pipeline pressure sensor is connected with the second single-cavity brake master cylinder assembly and the second electric control booster;
the second electric control booster comprises a second electric control booster execution motor and a second electric control booster ECU; and the second electronic control booster ECU is connected with the second pipeline pressure sensor, the second electronic control booster ECU is connected with the first electronic control booster ECU, the second electronic control booster ECU is connected with the second electronic control booster executing motor, and the second electronic control booster executing motor is connected with the second single-cavity brake master cylinder assembly.
In one embodiment, the brake pedal displacement sensor collects a displacement signal output by the brake pedal and outputs the displacement signal to the first electronic control booster ECU; the brake pedal displacement sensor is a double-channel sensor or a single-channel sensor.
In one embodiment, the first electronic control booster ECU receives the displacement signal, calculates a braking deceleration signal and a line pressure signal, and outputs a first line pressure control signal; and the first electronic control booster ECU outputs the calculated braking deceleration signal and the calculated pipeline pressure signal to the second electronic control booster ECU, and the second electronic control booster ECU outputs a second pipeline pressure control signal.
In one embodiment, the first electric booster execution motor receives the first pipeline pressure control signal, and pushes the first single-cavity brake master cylinder assembly to generate hydraulic pressure; the first electric control booster execution motor is independently controlled by the first electric control booster ECU.
In one embodiment, the second electric booster actuating motor receives the second line pressure control signal, and pushes the second single-cavity brake master cylinder assembly to generate hydraulic pressure; and the second electric control booster execution motor is independently controlled by the second electric control booster ECU.
In one embodiment, the first pipeline pressure sensor collects pipeline pressure generated by the first single-cavity brake master cylinder assembly and outputs the collection result to the first electronic control booster ECU, and the first electronic control booster ECU adjusts the first pipeline pressure control signal according to the collection result to complete closed-loop feedback control;
and the second pipeline pressure sensor collects the pipeline pressure generated by the second single-cavity brake master cylinder assembly and outputs the collection result to the second electronic control booster ECU, and the second electronic control booster ECU adjusts the second pipeline pressure control signal according to the collection result to complete closed-loop feedback control.
In one embodiment, the first electric booster actuating motor pushes the first single-chamber brake master cylinder assembly to generate hydraulic pressure, and the hydraulic pressure is connected with the ABS/ESC unit through a hydraulic oil pipe, and the ABS/ESC unit distributes the hydraulic pressure to the front axle brake and the rear axle brake.
In one embodiment, the second electric booster actuating motor pushes the second single-chamber brake master cylinder assembly to generate hydraulic pressure, and the hydraulic pressure is connected with the ABS/ESC unit through a hydraulic oil pipe, and the ABS/ESC unit distributes the hydraulic pressure to the front axle brake and the rear axle brake.
In one embodiment, the first and second electronic booster ECUs also individually adjust the front axle brake or the rear axle brake according to a system external braking request or according to a braking torque fed back by the power motor.
The invention has the beneficial effects that: according to the double-booster decoupling type hydraulic braking system, the first electric control booster with single-cavity brake master cylinder assembly and the second electric control booster with single-cavity brake master cylinder assembly are adopted to respectively control the output pressure of the two single-cavity brake master cylinders, then the two single-cavity brake master cylinders are connected to the ABS/ESC unit of the chassis through the hydraulic oil pipe, and finally the two single-cavity brake master cylinders are distributed to the front axle brake and the rear axle brake to realize braking. The double-booster decoupling type hydraulic brake system achieves decoupling of brake pedal force and system pipeline pressure, can respond to an external active brake request and achieve adjustment of front axle and rear axle brake pipeline pressure, achieves decoupling of front axle and rear axle brake force, can achieve a more complex and efficient brake energy recovery control strategy, is mechanically connected with the first electric control booster with the single-cavity brake master cylinder assembly, can still directly act on the single-cavity brake master cylinder through stepping on the brake pedal when a booster fails to work, and achieves emergency braking of a vehicle.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a double booster decoupled hydraulic brake system provided in this embodiment.
FIG. 2 is a logic diagram of closed loop control in a first electronically controlled booster master cylinder assembly with a single chamber.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
In order to decouple the brake pedal force and the pipeline pressure in the braking system and decouple the front axle pipeline pressure and the rear axle pipeline pressure and the braking force, the embodiment provides the double-booster decoupling type hydraulic braking system.
As shown in fig. 1, the present embodiment provides a dual booster decoupled hydraulic brake system, which includes a brake pedal 10, a brake pedal displacement sensor 20, a first electric booster band single-chamber brake master cylinder assembly 30, a second electric booster band single-chamber brake master cylinder assembly 40, an ABS/ESC unit 50, a front axle brake 60, and a rear axle brake 70.
The brake pedal displacement sensor 20 is connected with the brake pedal 10, the brake pedal displacement sensor 20 collects the stroke of the brake pedal 10, the brake pedal 10 is mechanically connected with a first electric control booster single-cavity brake master cylinder assembly 30, the brake pedal displacement sensor 20 is connected with the first electric control booster single-cavity brake master cylinder assembly 30, the first electric control booster single-cavity brake master cylinder assembly 30 is connected with a second electric control booster single-cavity brake master cylinder assembly 40, the first electric control booster single-cavity brake master cylinder assembly 30 and the second electric control booster single-cavity brake master cylinder assembly 40 are connected with the ABS/ESC unit 50, and the ABS/ESC unit 50 is connected with the front axle brake 60 and the rear axle brake 70.
In the double-booster decoupling type hydraulic brake system provided by the embodiment, the first electric control booster single-cavity brake master cylinder assembly 30 and the second electric control booster single-cavity brake master cylinder assembly 40 are both arranged in a vehicle cab and are mechanically connected with the brake pedal 10 through the first electric control booster single-cavity brake master cylinder assembly 30, the second electric control booster single-cavity brake master cylinder assembly 40 is not connected with the brake pedal 10, and the second electric control booster single-cavity brake master cylinder assembly 40 is connected with the first electric control booster single-cavity brake master cylinder assembly 30. Then the first electric control booster brake master cylinder assembly with single cavity 30 and the second electric control booster brake master cylinder assembly with single cavity 40 are connected to the ABS/ESC unit 50 on the chassis through hydraulic oil pipes, and the ABS/ESC unit 50 distributes pipeline pressure to the front axle brake 60 and the rear axle brake 70, so that the decoupling of brake pedal force and pipeline pressure is realized, and the decoupling of front axle and rear axle pipeline pressure and brake force is realized. The double-booster decoupling type hydraulic brake system provided by the embodiment can decouple the brake pedal force and the system pipeline pressure, can respond to an external active brake request, and can adjust the brake pipeline pressure of the front axle and the rear axle, so that the decoupling of the brake force of the front axle and the rear axle is realized, more complex and efficient brake energy recovery control strategies can be realized, the brake pedal is mechanically connected with the first electric control booster with the single-cavity brake master cylinder assembly, a certain brake force can be generated by directly acting on the single-cavity brake master cylinder through stepping on the brake pedal when the booster fails, and the emergency braking of a vehicle is realized.
In one embodiment, first electronically controlled booster single chamber master cylinder assembly 30 includes: a first electronic control booster, a first single-chamber brake master cylinder assembly and a first line pressure sensor 302; the first electric control booster is connected with the first single-cavity brake master cylinder assembly, and the first pipeline pressure sensor 302 is connected with the first single-cavity brake master cylinder assembly and the first electric control booster.
The first electric control booster comprises a first electric control booster execution motor and a first electric control booster ECU 301; first electronic control booster ECU301 is connected with first pipeline pressure sensor 302, and first electronic control booster ECU301 is connected with first electronic control booster actuating motor, and first electronic control booster ECU301 is connected with brake pedal displacement sensor 20, and first electronic control booster actuating motor connects first single chamber brake master cylinder assembly.
Further, the second electric booster single chamber master cylinder assembly 40 includes a second electric booster, a second single chamber master cylinder assembly and a second line pressure sensor 402; the second electric booster is connected with the second single-cavity brake master cylinder assembly, and the second pipeline pressure sensor 402 is connected with the second single-cavity brake master cylinder assembly and the second electric booster.
The second electric control booster comprises a second electric control booster execution motor and a second electric control booster ECU 401; and the second electronic control booster ECU401 is connected with a second pipeline pressure sensor 402, the second electronic control booster ECU401 is connected with the first electronic control booster ECU301, the second electronic control booster ECU401 is connected with a second electronic control booster execution motor, and the second electronic control booster execution motor is connected with a second single-cavity brake master cylinder assembly.
In one embodiment, the brake pedal displacement sensor 20 is electrically connected to the first electronic booster ECU301, and the brake pedal displacement sensor 20 collects the displacement signal output by the brake pedal 10 and outputs the displacement signal to the first electronic booster ECU 301. The brake pedal displacement sensor 20 is a dual channel sensor or a single channel sensor.
Specifically, in a conventional braking mode, the output end of a brake pedal 10 controlled by a driver does not act on a first electric control booster and a first single-cavity brake master cylinder assembly, the braking intention of the driver is detected only through a brake pedal displacement sensor 20, the stroke of the brake pedal is collected, then the brake pedal displacement sensor 20 is transmitted to a first electric control booster ECU301 through an electric signal, and the first electric control booster is controlled by the first electric control booster ECU301 to push the first single-cavity brake master cylinder assembly to generate pipeline pressure; and the first electronic control booster ECU301 transmits an electric signal to the second electronic control booster ECU401, and the second electronic control booster ECU401 controls the second electronic control booster to push the second single-cavity brake master cylinder assembly to generate pipeline pressure.
In one embodiment, the first electronic control booster ECU301 receives the displacement signal output by the brake pedal displacement sensor 20, a curve of the corresponding relation between the brake pedal stroke and the line fluid pressure is preset in the first electronic control booster ECU301, and the first electronic control booster ECU301 calculates the brake deceleration signal and the line pressure signal according to the displacement signal. Correspondingly, the first electronic control booster ECU301 outputs a first line pressure control signal; the first electronic control booster ECU301 outputs the calculated brake deceleration signal and line pressure signal to the second electronic control booster ECU401, and correspondingly, the second electronic control booster ECU401 outputs a second line pressure control signal. In the double-booster decoupling type hydraulic brake system, the braking intention of a driver is judged mainly through a first electronic control booster ECU301, and a pipeline pressure signal is correspondingly output to control a first single-cavity brake master cylinder assembly to generate pipeline pressure. And the first electronic control booster ECU301 outputs the corresponding braking information to the second electronic control booster ECU401, thereby achieving the decoupling of the braking force.
In one embodiment, a first electric booster actuator motor receives the first line pressure control signal and the first electric booster actuator motor pushes the first single chamber master cylinder assembly to generate hydraulic pressure. The first electric control booster execution motor is independently controlled by the first electric control booster ECU 301.
In one embodiment, a second electric booster actuator motor receives the second line pressure control signal, and the second electric booster actuator motor pushes the second single-chamber master cylinder assembly to generate hydraulic pressure. The second electric booster execution motor is independently controlled by the second electric booster ECU 401.
In one embodiment, the first pipeline pressure sensor 302 collects pipeline pressure generated by the first single-cavity brake master cylinder assembly and outputs the collected result to the first electronic control booster ECU301, and the first electronic control booster ECU301 adjusts a first pipeline pressure control signal according to the collected result to complete closed-loop feedback control;
the second pipeline pressure sensor 402 collects pipeline pressure generated by the second single-cavity brake master cylinder assembly and outputs the collection result to the second electronic control booster ECU401, and the second electronic control booster ECU401 adjusts a second pipeline pressure control signal according to the collection result to complete closed-loop feedback control.
Specifically, as shown in fig. 2, a logic diagram of closed-loop control in a first electric control booster with a single-chamber brake master cylinder assembly is shown. The brake pedal displacement sensor 20 collects a stroke of the brake pedal 10 according to the braking intention of the driver, and outputs a brake pedal stroke signal. The first electronic control booster ECU301 receives a stroke signal of the brake pedal 10, and a curve of a corresponding relationship between the pedal stroke and the line hydraulic pressure is preset inside the first electronic control booster ECU 301. The first electronic control booster ECU301 converts the brake pedal stroke signal into a line pressure control signal. The first electric control booster execution motor receives the first pipeline pressure control signal, the first electric control booster execution motor pushes the first single-cavity brake master cylinder assembly to generate hydraulic pressure, and the hydraulic pressure generated by the first single-cavity brake master cylinder assembly is transmitted to the brake to generate braking force. The output end of the first single-cavity brake master cylinder assembly is provided with a first pipeline pressure sensor 302, when the first electric control booster execution motor pushes the first single-cavity brake master cylinder assembly to generate hydraulic pressure, the first pipeline pressure sensor 302 detects the hydraulic pressure generated by the first single-cavity brake master cylinder assembly and outputs the hydraulic pressure to a first electric control booster ECU301, and the first electric control booster ECU301 adjusts a first pipeline pressure control signal according to a collection result to complete closed-loop feedback control.
Similarly, in a second electric booster single chamber master brake cylinder assembly, second electric booster ECU401 receives the brake deceleration signal and the line pressure signal of first electric booster ECU301, and second electric booster ECU401 outputs a second line pressure control signal. And the second electric control booster execution motor receives a second pipeline pressure control signal, the second electric control booster execution motor pushes the second single-cavity brake master cylinder assembly to generate hydraulic pressure, and the hydraulic pressure generated by the second single-cavity brake master cylinder assembly is transmitted to the brake to generate braking force. The output end of the second single-cavity brake master cylinder assembly is provided with a second pipeline pressure sensor 402, the second pipeline pressure sensor 402 detects hydraulic pressure generated by the second single-cavity brake master cylinder assembly and outputs the hydraulic pressure to a second electronic booster ECU401 when the second electronic booster execution motor pushes the second single-cavity brake master cylinder assembly to generate hydraulic pressure, and the second electronic booster ECU401 adjusts a second pipeline pressure control signal according to a collection result to complete closed-loop feedback control.
In one embodiment, the first electric booster actuator motor pushes the first single-chamber master cylinder assembly to generate hydraulic pressure, the first single-chamber master cylinder assembly is connected with the ABS/ESC unit 50 through a hydraulic oil pipe, the ABS/ESC unit 50 distributes the hydraulic pressure to the front axle brake 60 and the rear axle brake 70, and the front axle brake 60 and the rear axle brake 70 generate braking force to wheels.
In one embodiment, the second electric booster actuator motor pushes the second single-chamber master cylinder assembly to generate hydraulic pressure, the second single-chamber master cylinder assembly is connected with the ABS/ESC unit 50 through a hydraulic oil pipe, the ABS/ESC unit 50 distributes the hydraulic pressure to the front axle brake 60 and the rear axle brake 70, and the front axle brake 60 and the rear axle brake 70 generate braking force to the wheels.
In one embodiment, first and second electronic booster ECUs 301 and 401 also individually adjust front axle brake 60 or rear axle brake 70 according to a system external braking request or according to a braking torque fed back by the power motor.
Specifically, the dual booster decoupled hydraulic brake system provided in the present embodiment has the following modes of operation.
And (3) a conventional brake boosting mode:
when a driver steps on the brake pedal 10, the brake pedal displacement sensor 20 collects the stroke of the brake pedal 10 and outputs a displacement signal, and the first electronic control booster ECU301 receives the displacement signal and judges the braking intention of the driver according to the displacement signal. According to a preset curve of the corresponding relation between the brake pedal stroke and the pipeline hydraulic pressure, the first electric control booster ECU301 calculates a brake deceleration signal and a pipeline pressure signal according to the displacement signal and outputs the brake deceleration signal and the pipeline pressure signal to the second electric control booster ECU 401. Then, the first electronic control booster ECU301 outputs a first pipeline pressure control signal, the first electronic control booster execution motor receives the first pipeline pressure control signal, and the first electronic control booster execution motor pushes the first single-cavity brake master cylinder assembly to generate hydraulic pressure. The second electronic control booster ECU401 outputs a second pipeline pressure control signal, the second electronic control booster execution motor receives the second pipeline pressure control signal, and the second electronic control booster execution motor pushes the second single-cavity brake master cylinder assembly to generate hydraulic pressure. First pipeline pressure sensor 302 gathers the pipeline pressure that first single chamber brake master cylinder assembly produced to export the acquisition result to first automatically controlled booster ECU301, first automatically controlled booster ECU301 adjusts first pipeline pressure control signal according to the acquisition result, accomplishes closed loop feedback control. The second pipeline pressure sensor 402 collects pipeline pressure generated by the second single-cavity brake master cylinder assembly and outputs the collection result to the second electronic control booster ECU401, and the second electronic control booster ECU401 adjusts a second pipeline pressure control signal according to the collection result to complete closed-loop feedback control. Higher control accuracy can be achieved through closed-loop feedback control. The first single-cavity brake master cylinder assembly and the second single-cavity brake master cylinder assembly are connected with the ABS/ESC unit 50 through hydraulic oil pipes, the ABS/ESC unit 50 distributes hydraulic pressure to the front axle brake 60 and the rear axle brake 70, and the front axle brake 60 and the rear axle brake 70 generate braking force for wheels.
In this scheme, because the pipeline pressure of front axle, rear axle promotes two single chamber brake master cylinders through two automatically controlled boosters respectively and realizes, so when two booster output power are different, two single chamber brake master cylinder output hydraulic pressure are also different to front axle, rear axle braking force realize controlling respectively. The pressure of the brake pipelines of the front axle and the rear axle is adjusted, so that the brake force decoupling of the front axle and the rear axle is realized, and a more complex and efficient brake energy recovery control strategy can be realized.
Auxiliary driving active braking mode:
when other intelligent auxiliary driving systems of the vehicle, such as Adaptive Cruise Control (ACC) and an automatic Braking system (AEB), need to decelerate the vehicle, the dual-booster decoupled hydraulic Braking system provided by the embodiment can respond to a deceleration Braking request of the intelligent auxiliary driving system. Under the condition that a driver does not tread a brake pedal, the first electronic control booster ECU receives a deceleration brake request of the intelligent auxiliary driving system and outputs a first pipeline pressure control signal, the first electronic control booster execution motor receives the first pipeline pressure control signal, and the first electronic control booster execution motor pushes the first single-cavity brake master cylinder assembly to generate hydraulic pressure. And the second electronic control booster ECU outputs a second pipeline pressure control signal, the second electronic control booster execution motor receives the second pipeline pressure control signal, and the second electronic control booster execution motor pushes the second single-cavity brake master cylinder assembly to generate hydraulic pressure. The first single-cavity brake master cylinder assembly and the second single-cavity brake master cylinder assembly are connected with the ABS/ESC unit through hydraulic oil pipes, the ABS/ESC unit distributes hydraulic pressure to the front axle brake and the rear axle brake, and the front axle brake and the rear axle brake generate braking force on wheels. Thereby achieving the deceleration braking effect of the vehicle.
A braking energy recovery mode:
when the braking energy recovery system of the vehicle works, the double-booster decoupling type hydraulic braking system provided by the embodiment can actively adjust and reduce the pipeline pressure of the braking system through the first electronic control booster ECU and the second electronic control booster ECU under the condition that the feeling of a brake pedal is not changed. Through first automatically controlled booster ECU and the automatically controlled booster ECU of second can synchronous adjustment front axle pipe pressure and rear axle pipe pressure, also can adjust the pipeline pressure of a certain axle alone according to specific need. The vehicle brake stability is improved while the vehicle brake energy recovery efficiency is ensured.
A power failure mode:
according to the double-booster decoupling type hydraulic brake system provided by the embodiment, when the electric control system or the electric control booster system fails, the brake pedal is mechanically connected with the first electric control booster single-cavity brake master cylinder assembly, so that the treading force of a driver on the brake pedal can directly act on the first electric control booster single-cavity brake master cylinder assembly of the first electric control booster single-cavity brake master cylinder assembly, a front shaft of a vehicle generates certain pipeline pressure and braking force, and the emergency braking requirement of the vehicle is met.
The double-booster decoupling type hydraulic braking system provided by the embodiment is mainly used for a double-shaft vehicle, and can be applied to a three-shaft or multi-shaft vehicle according to actual use requirements in an expanding mode, namely more electric control booster single-cavity brake master cylinder assemblies are added.
The type of the electric control booster in the embodiment can be selected from various boosting forms according to requirements, and the boosting forms include, but are not limited to, a rack-and-pinion type, a lead screw nut type and other forms.
The double-booster decoupling type hydraulic brake system provided by the embodiment can realize decoupling of brake pedal force and system pipeline pressure, can respond to an external active braking request, can adjust braking force generated by friction braking when a power motor recovers braking energy, and realizes better brake pedal feeling. The pipeline pressures of the front axle and the rear axle are respectively realized by pushing the two single-cavity brake master cylinders through the two electric control boosters, so that when the output forces of the two boosters are different, the output hydraulic pressures of the two single-cavity brake master cylinders are also different, and the regulation of the pipeline pressures of the front axle and the rear axle is realized, thereby realizing the decoupling of the braking force of the front axle and the rear axle and realizing a more complex and efficient braking energy recovery control strategy. The first electric control booster is mechanically connected with the brake pedal through the single-cavity brake master cylinder assembly, and when the booster fails, the first electric control booster can still directly act on the single-cavity brake master cylinder through stepping on the brake pedal to generate certain braking force, so that emergency braking of a vehicle is realized. The first electric control booster with the single-cavity brake master cylinder assembly and the second electric control booster with the single-cavity brake master cylinder assembly are both arranged in the cab, the structure is compact, the arrangement space is saved, and the arrangement of a circuit and a hydraulic pipeline is relatively simple.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features of the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A double-booster decoupling type hydraulic braking system is characterized by comprising a brake pedal, a brake pedal displacement sensor, a first electric control booster with single-cavity brake master cylinder assembly, a second electric control booster with single-cavity brake master cylinder assembly, an ABS/ESC unit, a front axle brake and a rear axle brake;
the brake pedal displacement sensor is connected with the brake pedal, the brake pedal is mechanically connected with the first electric control booster belt single-cavity brake master cylinder assembly, the brake pedal displacement sensor is connected with the first electric control booster belt single-cavity brake master cylinder assembly, the first electric control booster belt single-cavity brake master cylinder assembly is connected with the second electric control booster belt single-cavity brake master cylinder assembly, the first electric control booster belt single-cavity brake master cylinder assembly and the second electric control booster belt single-cavity brake master cylinder assembly are connected with the ABS/ESC unit, and the ABS/ESC unit is connected with the front axle brake and the rear axle brake.
2. The dual booster decoupled hydraulic brake system of claim 1, wherein the first electronically controlled booster with single chamber master brake cylinder assembly comprises: the brake system comprises a first electric control booster, a first single-cavity brake master cylinder assembly and a first pipeline pressure sensor; the first electric control booster is connected with the first single-cavity brake master cylinder assembly, and the first pipeline pressure sensor is connected with the first single-cavity brake master cylinder assembly and the first electric control booster;
the first electric control booster comprises a first electric control booster execution motor and a first electric control booster ECU; the first electronic control booster ECU is connected with the first pipeline pressure sensor, the first electronic control booster ECU is connected with the first electronic control booster execution motor, the first electronic control booster ECU is connected with the brake pedal displacement sensor, and the first electronic control booster execution motor is connected with the first single-cavity brake master cylinder assembly;
the second electric control booster brake master cylinder assembly with the single cavity comprises a second electric control booster, a second single cavity brake master cylinder assembly and a second pipeline pressure sensor; the second electric control booster is connected with the second single-cavity brake master cylinder assembly, and the second pipeline pressure sensor is connected with the second single-cavity brake master cylinder assembly and the second electric control booster;
the second electric control booster comprises a second electric control booster execution motor and a second electric control booster ECU; and the second electronic control booster ECU is connected with the second pipeline pressure sensor, the second electronic control booster ECU is connected with the first electronic control booster ECU, the second electronic control booster ECU is connected with the second electronic control booster executing motor, and the second electronic control booster executing motor is connected with the second single-cavity brake master cylinder assembly.
3. The dual booster decoupled hydraulic brake system of claim 2, wherein the brake pedal displacement sensor collects a displacement signal output by the brake pedal and outputs the displacement signal to the first electronic booster ECU; the brake pedal displacement sensor is a double-channel sensor or a single-channel sensor.
4. The dual booster decoupled hydraulic brake system of claim 3, wherein the first electronic booster ECU receives the displacement signal, calculates a brake deceleration signal and a line pressure signal, and outputs a first line pressure control signal; and the first electronic control booster ECU outputs the calculated braking deceleration signal and the calculated pipeline pressure signal to the second electronic control booster ECU, and the second electronic control booster ECU outputs a second pipeline pressure control signal.
5. The dual booster decoupled hydraulic brake system of claim 4, wherein the first electronic booster actuation motor receives the first line pressure control signal, the first electronic booster actuation motor pushing the first single chamber brake master cylinder assembly to generate hydraulic pressure; the first electric control booster execution motor is independently controlled by the first electric control booster ECU.
6. The dual booster decoupled hydraulic brake system of claim 5, wherein the second electric booster actuation motor receives the second line pressure control signal, the second electric booster actuation motor pushing the second single chamber master brake cylinder assembly to generate hydraulic pressure; and the second electric control booster execution motor is independently controlled by the second electric control booster ECU.
7. The dual booster decoupled hydraulic brake system of claim 6, wherein the first line pressure sensor collects line pressure generated by the first single chamber brake master cylinder assembly and outputs the collected result to the first electronic booster ECU, and the first electronic booster ECU adjusts the first line pressure control signal according to the collected result to complete closed loop feedback control;
and the second pipeline pressure sensor collects the pipeline pressure generated by the second single-cavity brake master cylinder assembly and outputs the collection result to the second electronic control booster ECU, and the second electronic control booster ECU adjusts the second pipeline pressure control signal according to the collection result to complete closed-loop feedback control.
8. The dual booster decoupled hydraulic brake system of claim 7, wherein the first electronically controlled booster actuation motor pushes the first single chamber brake master cylinder assembly to generate hydraulic pressure and is connected to the ABS/ESC unit through a hydraulic oil line, the ABS/ESC unit distributing hydraulic pressure to the front axle brake and the rear axle brake.
9. The dual booster decoupled hydraulic brake system of claim 8, wherein the second electronically controlled booster actuation motor pushes the second single chamber brake master cylinder assembly to generate hydraulic pressure and is connected to the ABS/ESC unit through a hydraulic oil line, the ABS/ESC unit distributing hydraulic pressure to the front axle brake and the rear axle brake.
10. The dual booster decoupled hydraulic brake system of claim 1, wherein the first and second electronic booster ECUs also individually adjust the front axle brakes or the rear axle brakes according to a system external braking request or according to a braking torque fed back by a power motor.
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