CN116691639A - Vehicle braking control method and system - Google Patents
Vehicle braking control method and system Download PDFInfo
- Publication number
- CN116691639A CN116691639A CN202310540029.8A CN202310540029A CN116691639A CN 116691639 A CN116691639 A CN 116691639A CN 202310540029 A CN202310540029 A CN 202310540029A CN 116691639 A CN116691639 A CN 116691639A
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- Prior art keywords
- master cylinder
- pipeline
- brake
- vehicle
- braking
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000012790 confirmation Methods 0.000 claims 1
- 238000004088 simulation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
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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
- B60T13/74—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
- B60T13/746—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 and mechanical transmission of the braking action
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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
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/40—Failsafe aspects of brake control systems
- B60T2270/413—Plausibility monitoring, cross check, redundancy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The application relates to a vehicle braking control method and a system, wherein the method comprises the following steps: determining whether a single-pipeline failure fault occurs in the at least two pipelines; if the electronic power-assisted braking system has a single-pipeline failure fault, determining whether the difference between the expected braking master cylinder pressure value and the actual braking master cylinder pressure value of the braking master cylinder exceeds a preset control threshold value; and if the difference between the expected brake master cylinder pressure value and the actual brake master cylinder pressure value of the brake master cylinder exceeds the control threshold value, controlling the rack to increase the rack stroke so as to increase the pressure in the non-failure pipeline, and controlling the vehicle to brake. According to the vehicle brake control method and system, under the condition of single-pipeline failure fault, the rack stroke is increased to provide larger pipeline pressure in a non-failure path, so that the braking force of the whole vehicle is improved, and the safety performance of the whole vehicle can be improved.
Description
Technical Field
The application relates to the technical field of vehicle braking, in particular to a vehicle braking control method and system.
Background
In the prior art, after a single-pipeline failure occurs in the whole vehicle, the braking force of the whole vehicle is greatly reduced, and the braking force of the whole vehicle can be increased only by increasing the input force of a brake pedal.
In view of the above problems, those skilled in the art have sought solutions.
Disclosure of Invention
The application aims to solve the technical problem of providing a vehicle braking control method and a vehicle braking control system aiming at the defects of the prior art so as to realize that a vehicle can provide higher braking force of the whole vehicle when a single-pipeline failure occurs.
In order to achieve the above object, the present application is realized by the following technical scheme:
a vehicle braking control method is used for controlling an electronic power-assisted braking system of a vehicle to brake the vehicle, wherein the electronic power-assisted braking system comprises a braking master cylinder, at least two pipelines, a rack, a motor, an electronic control unit and a braking device; the brake master cylinder is communicated with at least two pipelines and is used for applying braking force to the braking device through the pipelines so as to control the braking of the vehicle, and the electronic control unit is used for controlling the motor to rotate so as to drive the rack to provide assistance for the brake master cylinder, and the brake master cylinder comprises the following steps:
determining whether a single-pipeline failure fault occurs in at least two pipelines;
if the electronic power-assisted braking system has a single-pipeline failure fault, determining whether the difference between the expected braking master cylinder pressure value and the actual braking master cylinder pressure value of the braking master cylinder exceeds a preset control threshold value;
and if the difference between the expected brake master cylinder pressure value and the actual brake master cylinder pressure value of the brake master cylinder exceeds the control threshold value, controlling the rack to increase the rack stroke to increase the pressure in the non-failure pipeline so as to control the vehicle brake.
Optionally, the method further comprises:
before determining whether a single-pipeline failure fault occurs in the electronic power-assisted braking system, determining the current rack stroke, setting the corresponding relation between the rack stroke and the pipeline pressure under the normal load condition as a normal load reference function of the vehicle, and setting the corresponding relation between the rack stroke and the pipeline pressure under the single-pipeline failure fault condition as a single-pipeline reference function of the vehicle;
and acquiring the expected brake master cylinder pressure according to the normal load reference function and the current rack travel, and acquiring a preset brake master cylinder pressure threshold according to the single-pipeline reference function and the current rack travel.
Optionally, determining whether a single-tube failure fault occurs in at least two tubes comprises:
determining whether a single pipeline in the at least two pipelines is in an under-pressure state;
and when the single pipeline is determined to be in the under-voltage state, judging that a single pipeline failure fault occurs.
Optionally, determining whether a single conduit of the at least two conduits is in an under-pressure condition comprises:
judging whether the pressure of a brake master cylinder in a pipeline is smaller than a preset brake master cylinder pressure threshold value or not;
and if the brake master cylinder pressure is smaller than the preset brake master cylinder pressure threshold value, confirming that a pipeline in the electronic power-assisted brake system is in the under-pressure state.
Optionally, before determining whether the single-circuit failure fault occurs in the electronic power-assisted brake system, the method further includes:
confirming whether the electronic power-assisted braking system is in a pressure building state or not;
if the electronic power-assisted braking system is in the pressure-building state, the method enters a step of determining whether a single pipeline in at least two pipelines is in an under-pressure state.
Optionally, determining whether the electric power brake system is in the pressure build state includes:
judging whether the current rack position is larger than a preset position threshold value or not, and judging whether the current rack speed is smaller than a preset speed threshold value or not;
and if the current rack position is greater than the preset position threshold value and the current rack speed is greater than or equal to the preset speed threshold value, confirming that the electronic power-assisted braking system is in the pressure building state.
The present application also provides a vehicle brake control system including: the electronic power-assisted braking system comprises a braking main cylinder, at least two pipelines, a rack, a motor, an electronic control unit and a braking device;
the brake master cylinder is communicated with at least two pipelines and is used for applying braking force to the braking device through the pipelines so as to control the vehicle to brake, and the electronic control unit is used for controlling the motor to rotate so as to drive the rack to provide assistance for the brake master cylinder;
the electronic control unit is used for confirming whether a single-pipeline failure fault occurs in at least two pipelines or not and confirming whether the difference between the expected brake master cylinder pressure value and the actual brake master cylinder pressure value of the brake master cylinder exceeds a preset control threshold value or not;
the electronic control unit is also configured to control the rack to increase rack travel to increase pressure in the non-failed line to control vehicle braking when a difference between a desired brake master cylinder pressure value and an actual brake master cylinder pressure value of the brake master cylinder exceeds the control threshold.
Optionally, the electronic control unit is further configured to: before determining whether the single-pipeline failure fault occurs in the electronic power-assisted braking system, determining the current rack stroke, setting the corresponding relation between the rack stroke and the pipeline pressure under the normal load condition as a normal load reference function of the vehicle, setting the corresponding relation between the rack stroke and the pipeline pressure under the single-pipeline failure fault condition as a single-pipeline reference function of the vehicle, acquiring the expected brake master cylinder pressure according to the normal load reference function and the current rack stroke, and acquiring the preset brake master cylinder pressure threshold according to the single-pipeline reference function and the current rack stroke.
Optionally, the electronic control unit is further configured to: and determining whether a single pipeline in the at least two pipelines is in an under-pressure state, and judging that a single pipeline failure fault occurs when the single pipeline is determined to be in the under-pressure state.
Optionally, the electronic control unit is further configured to: judging whether the brake master cylinder pressure in the pipeline is smaller than a preset brake master cylinder pressure threshold value, and if the brake master cylinder pressure is smaller than the preset brake master cylinder pressure threshold value, confirming that the pipeline in the electronic power-assisted brake system is in the under-pressure state.
Optionally, the electronic control unit is further configured to: confirming whether the electronic power-assisted braking system is in a pressure building state or not; judging whether the current rack position is larger than a preset position threshold value or not and judging whether the current rack speed is smaller than a preset speed threshold value or not; and if the current rack position is greater than the preset position threshold value and the current rack speed is greater than or equal to the preset speed threshold value, confirming that the electronic power-assisted braking system is in a pressure building state.
The application provides a vehicle braking control method and a vehicle braking control system, which can improve the braking force of a whole vehicle and the safety performance of the whole vehicle by increasing the stroke of a rack to provide larger pipeline pressure in a non-failed road under the condition of single pipeline failure.
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
The application is described in detail below with reference to the drawings and the detailed description;
FIG. 1 is a flow chart of a vehicle brake control method according to an embodiment of the present application;
FIG. 2 is a reference graph of a normal load reference function versus a single pipeline reference function provided by an embodiment of the present application;
fig. 3 is a functional block diagram of a vehicle brake control system according to an embodiment of the present application.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Fig. 1 is a schematic flow chart of a vehicle brake control method according to an embodiment of the present application, referring to fig. 1, the present application provides a vehicle brake control method for controlling an electronic power-assisted brake system of a vehicle to brake the vehicle, where the electronic power-assisted brake system includes a master cylinder, at least two pipelines, a rack, a motor, an electronic control unit and a brake device; the brake master cylinder is communicated with at least two pipelines and is used for applying braking force to the braking device through the pipelines so as to control the braking of the vehicle, and the electronic control unit is used for controlling the motor to rotate so as to drive the rack to provide assistance for the brake master cylinder, and the brake master cylinder comprises the following steps:
determining whether a single-pipeline failure fault occurs in at least two pipelines;
if the electronic power-assisted braking system has a single-pipeline failure fault, determining whether the difference between the expected braking master cylinder pressure value and the actual braking master cylinder pressure value of the braking master cylinder exceeds a preset control threshold value;
if the difference between the desired master cylinder pressure value and the actual master cylinder pressure value exceeds a control threshold, the control rack increases the rack travel to increase the pressure in the non-failed line to control vehicle braking.
Fig. 2 is a reference graph of a normal load reference function and a single-circuit reference function according to an embodiment of the present application, referring to fig. 2, curve (1) is a normal load reference function curve, and curve (2) is a single-circuit reference function curve when a single-circuit fails.
Before determining whether a single-pipeline failure fault occurs in the electronic power-assisted braking system, determining the current rack stroke, setting the corresponding relation between the rack stroke and the pipeline pressure under the normal load condition as a normal load reference function of the vehicle, and setting the corresponding relation between the rack stroke and the pipeline pressure under the single-pipeline failure fault condition as a single-pipeline reference function of the vehicle; and acquiring the expected brake master cylinder pressure according to the normal load reference function and the current rack travel, and acquiring a preset brake master cylinder pressure threshold according to the single-pipeline reference function and the current rack travel.
In this embodiment, the normal load reference function curve (1) and the single-tube reference function curve (2) share the same coordinate system, and the abscissa of the coordinate system is the rack stroke and the ordinate is the tube pressure. In a normal load reference function curve (1), corresponding expected brake master cylinder pressure can be obtained according to the current rack travel; in the single-pipeline reference function curve (2), a corresponding preset brake master cylinder pressure threshold value can be obtained according to the current rack travel.
In this embodiment, in the step of determining whether the difference between the desired master cylinder pressure value and the actual master cylinder pressure value of the master cylinder exceeds the preset control threshold value if the single-tube failure fault occurs in the electric power-assisted brake system, the specific value of the control threshold value is not unique because the normal load reference function curves (1) of different vehicles are different.
Optionally, determining whether a single-tube failure fault occurs in at least two tubes comprises:
determining whether a single pipeline in the at least two pipelines is in an under-pressure state;
and when the single pipeline is determined to be in the under-voltage state, judging that a single pipeline failure fault occurs.
Optionally, determining whether a single conduit of the at least two conduits is in an under-pressure condition comprises:
judging whether the pressure of a brake master cylinder in a pipeline is smaller than a preset brake master cylinder pressure threshold value or not;
and if the brake master cylinder pressure is smaller than the preset brake master cylinder pressure threshold value, confirming that a pipeline in the electronic power-assisted brake system is in the under-pressure state.
Optionally, before determining whether the single-circuit failure fault occurs in the electronic power-assisted brake system, the method further includes:
confirming whether the electronic power-assisted braking system is in a pressure building state or not;
if the electronic power-assisted braking system is in the pressure-building state, the method enters a step of determining whether a single pipeline in at least two pipelines is in an under-pressure state.
Optionally, determining whether the electric power brake system is in the pressure build state includes:
judging whether the current rack position is larger than a preset position threshold value or not, and judging whether the current rack speed is smaller than a preset speed threshold value or not;
and if the current rack position is greater than the preset position threshold value and the current rack speed is greater than or equal to the preset speed threshold value, confirming that the electronic power-assisted braking system is in the pressure building state.
In one embodiment, the preset position threshold is 11mm and the preset speed threshold is 6mm/s. In other embodiments, different preset position thresholds and preset speed thresholds may be set depending on the type of vehicle.
It should be understood that the normal load reference function curve (1) and the single-pipe reference function curve (2) shown in fig. 2 in the present embodiment are merely exemplary reference curves of the present application, and that the normal load reference function curve (1) and the single-pipe reference function curve (2) are different for different types of vehicles in practice.
Fig. 3 is a functional block diagram of a vehicle brake control system according to an embodiment of the present application, referring to fig. 3, the present application further provides a vehicle brake control system, including: the electronic power-assisted braking system comprises a braking main cylinder, at least two pipelines, a rack, a motor, an electronic control unit and a braking device.
The brake master cylinder is communicated with at least two pipelines and is used for applying braking force to the braking device through the pipelines so as to control the braking of the vehicle, and the electronic control unit is used for controlling the motor to rotate so as to drive the rack to provide assistance for the brake master cylinder.
In one embodiment, the brake master cylinder adopts products which are already developed and mature in the market, the quality is reliable, and the development cost is saved.
The electronic control unit is used for confirming whether a single-pipeline failure fault occurs in at least two pipelines and confirming whether the difference between the expected brake master cylinder pressure value and the actual brake master cylinder pressure value of the brake master cylinder exceeds a preset control threshold value.
The electronic control unit is also configured to control the rack to increase rack travel to increase pressure in the non-failed line to control vehicle braking when a difference between a desired brake master cylinder pressure value and an actual brake master cylinder pressure value of the brake master cylinder exceeds the control threshold.
Optionally, the electronic control unit is further configured to: before determining whether the single-pipeline failure fault occurs in the electronic power-assisted braking system, determining the current rack stroke, setting the corresponding relation between the rack stroke and the pipeline pressure under the normal load condition as a normal load reference function of the vehicle, setting the corresponding relation between the rack stroke and the pipeline pressure under the single-pipeline failure fault condition as a single-pipeline reference function of the vehicle, acquiring the expected brake master cylinder pressure according to the normal load reference function and the current rack stroke, and acquiring the preset brake master cylinder pressure threshold according to the single-pipeline reference function and the current rack stroke.
Optionally, the electronic control unit is further configured to: and determining whether a single pipeline in the at least two pipelines is in an under-pressure state, and judging that a single pipeline failure fault occurs when the single pipeline is determined to be in the under-pressure state.
Optionally, the electronic control unit is further configured to: judging whether the brake master cylinder pressure in the pipeline is smaller than a preset brake master cylinder pressure threshold value, and if the brake master cylinder pressure is smaller than the preset brake master cylinder pressure threshold value, confirming that the pipeline in the electronic power-assisted brake system is in the under-pressure state.
Optionally, the electronic control unit is further configured to: confirming whether the electronic power-assisted braking system is in a pressure building state or not; judging whether the current rack position is larger than a preset position threshold value or not and judging whether the current rack speed is smaller than a preset speed threshold value or not; and if the current rack position is greater than the preset position threshold value and the current rack speed is greater than or equal to the preset speed threshold value, confirming that the electronic power-assisted braking system is in a pressure building state.
In one embodiment, the electronic power-assisted braking system further includes: a pedal feel unit (not shown). The pedal feel unit comprises a simulation spring, a pedal push rod, a pedal feel compensation cavity and a compensation spring, wherein the simulation spring is used for simulating pedal feel when the braking strength is small, the pedal feel compensation cavity is connected with an outlet of a brake master cylinder, and hydraulic pressure of the compensation cavity and the simulation spring cooperate to realize proper pedal feel feedback.
The application also provides a vehicle comprising the vehicle brake control system.
It is to be understood that both the general principles and the general features of the present application, as well as the advantages of the present application, are illustrated and described above. It should be understood by those skilled in the art that the present application is not limited by the foregoing embodiments, but rather, the embodiments and descriptions described herein are merely illustrative of the principles of the present application, and any modifications, equivalents, or improvements made within the spirit and principles of the present application are intended to be included within the scope of the present application.
Claims (10)
1. A vehicle braking control method is used for controlling an electronic power-assisted braking system of a vehicle to brake the vehicle, and the electronic power-assisted braking system comprises a braking master cylinder, at least two pipelines, a rack, a motor, an electronic control unit and a braking device; the brake master cylinder is communicated with the at least two pipelines and is used for applying braking force to the braking device through the pipelines so as to control vehicle braking, and the electronic control unit is used for controlling the motor to rotate so as to drive the rack to provide assistance for the brake master cylinder, and is characterized by comprising the following steps of:
determining whether a single-pipeline failure fault occurs in the at least two pipelines;
if the electronic power-assisted braking system has a single-pipeline failure fault, determining whether the difference between the expected braking master cylinder pressure value and the actual braking master cylinder pressure value of the braking master cylinder exceeds a preset control threshold value;
and if the difference between the expected brake master cylinder pressure value and the actual brake master cylinder pressure value of the brake master cylinder exceeds the control threshold value, controlling the rack to increase the rack stroke so as to increase the pressure in the non-failure pipeline, and controlling the vehicle to brake.
2. The vehicle brake control method according to claim 1, characterized by further comprising:
before determining whether the single-pipeline failure fault occurs in the electronic power-assisted braking system, determining a current rack stroke, setting a corresponding relation between the rack stroke and pipeline pressure under a normal load condition as a normal load reference function of the vehicle, and setting a corresponding relation between the rack stroke and the pipeline pressure under the single-pipeline failure fault condition as a single-pipeline reference function of the vehicle;
and acquiring the expected brake master cylinder pressure according to the normal load reference function and the current rack stroke, and acquiring the preset brake master cylinder pressure threshold according to the single-pipeline reference function and the current rack stroke.
3. The vehicle brake control method according to claim 2, wherein the determining whether a single-pipe failure occurs in the at least two pipes includes:
determining whether a single pipeline in the at least two pipelines is in an under-pressure state;
and when the single pipeline is determined to be in the under-voltage state, judging that a single pipeline failure fault occurs.
4. The vehicle brake control method according to claim 3, wherein the determining whether a single line of the at least two lines is in an under-pressure state includes:
judging whether the brake master cylinder pressure in the pipeline is smaller than a preset brake master cylinder pressure threshold value or not;
and if the brake master cylinder pressure is smaller than the preset brake master cylinder pressure threshold value, confirming that the pipeline in the electronic power-assisted brake system is in the under-pressure state.
5. The vehicle brake control method according to claim 4, wherein the determining whether the single-tube failure of the electric power-assisted brake system occurs further comprises:
confirming whether the electronic power-assisted braking system is in a pressure building state or not;
if the electronic power-assisted braking system is in the pressure building state, the step of determining whether a single pipeline in the at least two pipelines is in an under-pressure state is performed.
6. The vehicle brake control method according to claim 5, characterized in that the confirmation of whether the electric power-assisted brake system is in a pressure build-up state includes:
judging whether the current rack position is larger than a preset position threshold value or not, and judging whether the current rack speed is smaller than a preset speed threshold value or not;
and if the current position of the rack is larger than the preset position threshold value and the current speed of the rack is larger than or equal to the preset speed threshold value, confirming that the electronic power-assisted braking system is in the pressure building state.
7. A vehicle brake control system, characterized by comprising: the electronic power-assisted braking system comprises a braking main cylinder, at least two pipelines, a rack, a motor, an electronic control unit and a braking device;
the brake master cylinder is communicated with the at least two pipelines and is used for applying braking force to the braking device through the pipelines so as to control the braking of the vehicle, and the electronic control unit is used for controlling the motor to rotate so as to drive the rack to provide assistance for the brake master cylinder;
the electronic control unit is used for confirming whether a single-pipeline failure fault occurs in the at least two pipelines or not and confirming whether the difference between the expected brake master cylinder pressure value and the actual brake master cylinder pressure value of the brake master cylinder exceeds a preset control threshold value or not;
the electronic control unit is also configured to control the rack to increase rack travel to increase pressure in the non-failed line to control vehicle braking when a difference between a desired brake master cylinder pressure value and an actual brake master cylinder pressure value of the brake master cylinder exceeds the control threshold.
8. The vehicle brake control system of claim 7, wherein the electronic control unit is further configured to: before determining whether the single-tube failure fault occurs in the electronic power-assisted brake system, determining a current rack stroke, setting a corresponding relation between the rack stroke and the tube pressure under a normal load condition as a normal load reference function of the vehicle, setting a corresponding relation between the rack stroke and the tube pressure under the single-tube failure fault condition as a single-tube reference function of the vehicle, acquiring the expected brake master cylinder pressure according to the normal load reference function and the current rack stroke, and acquiring the preset brake master cylinder pressure threshold according to the single-tube reference function and the current rack stroke.
9. The vehicle brake control system of claim 7, wherein the electronic control unit is further configured to: determining whether a single pipeline in the at least two pipelines is in an under-pressure state, and judging that a single pipeline failure fault occurs when the single pipeline is determined to be in the under-pressure state.
10. The vehicle brake control system of claim 9, wherein the electronic control unit is further configured to: judging whether the brake master cylinder pressure in the pipeline is smaller than a preset brake master cylinder pressure threshold value, and if the brake master cylinder pressure is smaller than the preset brake master cylinder pressure threshold value, confirming that the pipeline in the electronic power-assisted brake system is in the under-pressure state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310540029.8A CN116691639B (en) | 2023-05-12 | 2023-05-12 | Vehicle braking control method and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310540029.8A CN116691639B (en) | 2023-05-12 | 2023-05-12 | Vehicle braking control method and system |
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| CN116691639A true CN116691639A (en) | 2023-09-05 |
| CN116691639B CN116691639B (en) | 2024-07-30 |
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| CN113353049A (en) * | 2021-08-11 | 2021-09-07 | 上海拿森汽车电子有限公司 | Electric control braking method and device and computer storage medium |
| CN114802165A (en) * | 2022-05-05 | 2022-07-29 | 江铃汽车股份有限公司 | Vehicle braking method, device, equipment and storage medium |
| CN115617017A (en) * | 2022-10-24 | 2023-01-17 | 拿森汽车科技(杭州)有限公司 | Electronic power-assisted brake system fault detection method, system, device and medium |
| CN115709705A (en) * | 2022-11-22 | 2023-02-24 | 中国第一汽车股份有限公司 | Brake boosting method and device and vehicle |
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