CN118025095A - Active pressure building method and system using Ibooster controller - Google Patents

Active pressure building method and system using Ibooster controller Download PDF

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Publication number
CN118025095A
CN118025095A CN202410358379.7A CN202410358379A CN118025095A CN 118025095 A CN118025095 A CN 118025095A CN 202410358379 A CN202410358379 A CN 202410358379A CN 118025095 A CN118025095 A CN 118025095A
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CN
China
Prior art keywords
target
pressure
braking
active
ibooster
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Pending
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CN202410358379.7A
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Chinese (zh)
Inventor
王千
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Chongqing Changan Automobile Co Ltd
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Chongqing Changan Automobile Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Chongqing Changan Automobile Co Ltd filed Critical Chongqing Changan Automobile Co Ltd
Priority to CN202410358379.7A priority Critical patent/CN118025095A/en
Publication of CN118025095A publication Critical patent/CN118025095A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • 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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/172—Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)

Abstract

The invention relates to an active pressure building method and system by utilizing Ibooster controllers, comprising the following steps: acquiring a target braking pressure; calculating a target flow of brake fluid in a pipeline according to the target brake pressure; controlling the liquid inlet valves corresponding to the wheels to be braked to be opened; controlling the liquid inlet valves corresponding to the wheels which do not need braking to be closed; and pressurizing the braking system according to the target flow by adopting a Ibooster controller. Through the technical scheme, the active pressure building method and system utilizing the Ibooster controller provided by the invention have the advantages that the Ibooster controller is combined with the ESP system, the active pressure building and the cooperative control of the liquid inlet valve are performed aiming at the combined active pressure building system, the USV valve system and the HSV valve system in the ESP hydraulic system are omitted, and the high-efficiency control of the ESP system on the vehicle is realized with lower hardware cost. And, because of the characteristic of the accurate control of Ibooster controllers, the accuracy of the active voltage establishment of the VDC can be improved.

Description

Active pressure building method and system using Ibooster controller
Technical Field
The invention relates to the technical field of vehicle control, in particular to an active pressure building method and system by utilizing Ibooster controllers.
Background
Currently, in the whole ESP system, as shown in fig. 1, active pressure build-up for VDC (Vehicle DynamicController, vehicle body dynamic control function) functions is completed by matching the pump and motor of the ESP. Compared with Ibooster, the capacity of active pressure build-up is obviously slower, serious hysteresis exists, and the problem of NVH exists, and the problem exists for controlling time and vehicle dynamic control which is short but requires extremely high corresponding speed.
The Ibooster controller acts as a new type of electric brake booster, the build-up capacity of which can be about 150ms, at maximum 150bar (about 1000 bar/s), but the current efficient and powerful build-up capacity of Ibooster is only applicable in terms of active boost to some specific ESP additional functions, the benefit that it brings to the main function of the ESP system is not obvious, especially for VDC. However, due to the structure of the hydraulic system of the ESP system, the Ibooster controller cannot be directly combined with the ESP hydraulic system.
Disclosure of Invention
One of the purposes of the present invention is to provide an active pressure building method and system using Ibooster controller, which can reduce the design cost of ESP and increase the braking efficiency of ESP.
In order to achieve the above objective, the present invention provides an active voltage building method using Ibooster controllers, including:
Acquiring a target braking pressure;
Calculating a target flow of brake fluid in a pipeline according to the target brake pressure;
Controlling the liquid inlet valves corresponding to the wheels to be braked to be opened;
Controlling the liquid inlet valves corresponding to the wheels which do not need braking to be closed;
and pressurizing the braking system according to the target flow by adopting a Ibooster controller.
Optionally, the active pressure building method includes:
determining a state of the vehicle;
and under the condition that the vehicle is subjected to tail flick or head pushing, acquiring the target braking pressure.
Optionally, calculating a target flow rate of brake fluid in the pipeline according to the target brake pressure comprises:
And calculating the target flow according to the target braking pressure by using a Bernoulli equation.
Optionally, the active pressure building method includes:
Calculating the incremental pressure and the flow rate under closed-loop control according to the target brake pressure and the target flow before controlling the feed-in valve to be opened or closed;
And determining the opening time and the closing time of the liquid inlet valve according to the increment pressure and the flow rate.
Optionally, the active pressure building method includes:
When the liquid inlet valve is controlled to be opened or closed, the normally-open valve on the side where the wheel needing braking is located is opened, and the normally-open valve on the side where the wheel needing no braking is located is closed.
In another aspect, the present invention also provides an active voltage building system using Ibooster controllers, the active voltage building system comprising:
An electronic stability program (Electronic Stability Program, ESP) control unit for obtaining the target braking force;
An external brake request (External Brake Request, EBR) module for calculating a target flow of brake fluid in the pipeline from the target brake pressure;
The hydraulic control module is used for:
Controlling the liquid inlet valves corresponding to the wheels to be braked to be opened;
Controlling the liquid inlet valves corresponding to the wheels which do not need braking to be closed;
And Ibooster the controller is used for pressurizing the braking system according to the target flow.
Optionally, the active pressure building system comprises an ESP module for:
determining a state of the vehicle;
and under the condition that the vehicle is subjected to tail flick or head pushing, acquiring the target braking pressure.
Optionally, the EBR module is configured to:
And calculating the target flow according to the target braking pressure by using a Bernoulli equation.
Optionally, the hydraulic control module is configured to:
Calculating the incremental pressure and the flow rate under closed-loop control according to the target brake pressure and the target flow before controlling the feed-in valve to be opened or closed;
And determining the opening time and the closing time of the liquid inlet valve according to the increment pressure and the flow rate.
Optionally, the hydraulic control module is used for opening the normally-open valve on the side where the wheels needing braking are located when the liquid inlet valve is controlled to be opened or closed, and closing the normally-open valve on the side where the wheels not needing braking are located.
The invention has the beneficial effects that:
Through the technical scheme, the active pressure building method and system utilizing the Ibooster controller provided by the invention have the advantages that the Ibooster controller is combined with the ESP system, the active pressure building and the cooperative control of the liquid inlet valve are performed aiming at the combined active pressure building system, the USV valve system and the HSV valve system in the ESP hydraulic system are omitted, and the high-efficiency control of the ESP system on the vehicle is realized with lower hardware cost. And, because of the characteristic of the accurate control of Ibooster controllers, the accuracy of the active voltage establishment of the VDC can be improved.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain, without limitation, the embodiments of the invention. In the drawings:
FIG. 1 is a schematic diagram of the operation of a conventional ESP system;
FIG. 2 is a flow chart of an active pressurization method utilizing Ibooster controllers according to one embodiment of the present invention;
FIG. 3 is a block diagram of an active pressure building system utilizing Ibooster controllers according to one embodiment of the present invention;
FIG. 4 is a block diagram of an active pressure building system utilizing Ibooster controllers according to one embodiment of the present invention.
Wherein, 1-Ibooster controllers; 2-a normally open valve; 3-a liquid inlet valve; a 4-ESP control unit; a 5-EBR module; 6-a hydraulic control module.
Detailed Description
Further advantages and effects of the present invention will become readily apparent to those skilled in the art from the disclosure herein, by referring to the accompanying drawings and the preferred embodiments. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
Fig. 2 is a flow chart of an active pressure building method using Ibooster controllers according to one embodiment of the present invention. In fig. 2, the active pressure build-up method may include the steps of:
in step S10, a target brake pressure is acquired;
in step S11, calculating a target flow rate of brake fluid in the pipe line according to the target brake pressure;
In step S12, controlling the liquid inlet valves corresponding to the wheels to be braked to be opened;
In step S13, controlling the liquid inlet valves corresponding to the wheels which do not need to be braked to be closed;
in step S14, a Ibooster controller is used to boost the brake system according to the target flow.
In this active pressure build-up method as shown in fig. 1, step S10 may be used to acquire a target brake pressure. The specific method of obtaining the target brake pressure may take a variety of forms known to those skilled in the art, such as direct reading from a vehicle controller. In one example of the invention, the method of obtaining the target brake pressure may be obtained by an ESP module of the vehicle.
Step S11 may be used to calculate a target flow rate of brake fluid in the line from the target brake pressure. The target flow rate may be calculated from the target brake pressure using, for example, the bernoulli equation.
After calculating the target flow rate, braking may be further completed by applying the hydraulic pressure generated by the brake fluid to the corresponding wheel to be braked. Consider the piping structure of an ESP hydraulic system, as shown in fig. 3. In the fig. 3 and 4 (fig. 3 is a simplified diagram, and fig. 4 is an example diagram), the ESP hydraulic system may include a normally open valve 2 and a liquid inlet valve 3, where the liquid inlet valves 3 are in one-to-one correspondence with the wheels, and the normally open valves 2 are respectively corresponding to the liquid inlet valves 3 of the wheels on both sides of the automobile. One end of the normally-open valve 2 can be connected with the Ibooster controller 1 through a pipeline, one end of the liquid inlet valve 3 can be connected with the other end of the normally-open valve 2 through a pipeline, and the other end of the liquid inlet valve 3 can be connected with a hydraulic cylinder of a wheel. Because the pipeline structure of the ESP hydraulic system is common, when the preset wheels are braked, the corresponding liquid inlet valves of the wheels which need to be braked can be controlled to be opened through the step S12, and then the corresponding liquid inlet valves of the wheels which do not need to be braked are controlled to be closed through the step S13. Finally, the braking system is pressurized according to the target flow by adopting Ibooster controller in step S14, thereby completing the braking of the specific wheel. Further, in order to avoid that the brake fluid enters a part of the pipeline on the side where the wheels which do not need to be braked, when the liquid inlet valve 3 is controlled to be opened or closed, the normally-open valve 2 on the side where the wheels which do not need to be braked are opened, and the normally-open valve 2 on the side where the wheels which do not need to be braked are closed.
In this embodiment, the activation condition for determining whether the target brake pressure needs to be obtained may be various forms known to those skilled in the art, such as determining whether the target brake pressure needs to be obtained directly by a brake pedal. Considering that the ESP system itself is intended to ensure the stability of the vehicle, the braking force is applied to one wheel only, in one example of the invention it may be to first determine the state of the vehicle and then to obtain the target braking pressure in case of a jerk or a push of the vehicle.
Steps S12 and S13 are used to control the opening or closing of the inlet valve. In one example of the present invention, to ensure accurate control, the incremental pressure and flow rate under closed-loop control may be calculated from the target brake pressure and the target flow rate before controlling the opening or closing of the inlet valve, and then the opening timing and closing timing of the inlet valve may be determined from the incremental pressure and flow rate.
In another aspect, the present invention also provides an active pressure building system using Ibooster controllers, as shown in fig. 3 and 4, which may include an ESP control unit 4, an EBR module 5, and hydraulic control modules 6, ibooster controller 1. Wherein the ESP control unit 4 may be used to obtain the target braking force. The EBR module 5 may be used to calculate a target flow of brake fluid in the line from the target brake pressure. The hydraulic control module 6 can be used for controlling the opening of the liquid inlet valve corresponding to the wheel needing braking and controlling the closing of the liquid inlet valve corresponding to the wheel needing no braking. Ibooster the controller 1 may be used to boost the brake system according to the target flow.
In this active pressure build-up system as shown in fig. 3, the ESP control unit 4 may be used to obtain the target brake pressure.
The EBR module 5 may be used to calculate a target flow of brake fluid in the line from the target brake pressure. The EBR module 5 may calculate the target flow rate from the target brake pressure using, for example, the bernoulli equation.
After calculating the target flow rate, braking may be further completed by applying the hydraulic pressure generated by the brake fluid to the corresponding wheel to be braked. Consider the piping structure of an ESP hydraulic system, as shown in fig. 3. In this fig. 3, the ESP hydraulic system may include a normally open valve 2 and a liquid inlet valve 3, wherein the liquid inlet valves 3 are in one-to-one correspondence with the wheels, and the normally open valves 2 are respectively corresponding to the liquid inlet valves 3 of the wheels on both sides of the automobile. One end of the normally-open valve 2 can be connected with the Ibooster controller 1 through a pipeline, one end of the liquid inlet valve 3 can be connected with the other end of the normally-open valve 2 through a pipeline, and the other end of the liquid inlet valve 3 can be connected with a hydraulic cylinder of a wheel. Because the pipeline structure of the ESP hydraulic system is common, when the preset wheels are braked, the hydraulic control module 6 can control the corresponding liquid inlet valves of the wheels which need to be braked to be opened, and then the hydraulic control module 6 can control the corresponding liquid inlet valves of the wheels which do not need to be braked to be closed. Finally, the braking system is pressurized according to the target flow by adopting the Ibooster controller, so that the braking of the specific wheel is completed. Further, in order to avoid that the brake fluid enters a part of the pipeline on the side where the wheels which do not need to be braked, when the liquid inlet valve 3 is controlled to be opened or closed, the normally-open valve 2 on the side where the wheels which do not need to be braked are opened, and the normally-open valve 2 on the side where the wheels which do not need to be braked are closed.
In this embodiment, the activation condition for determining whether the target brake pressure needs to be obtained may be various forms known to those skilled in the art, such as determining whether the target brake pressure needs to be obtained directly by a brake pedal. Considering that the ESP system itself is intended to ensure the stability of the vehicle, the braking force is applied to one wheel only, in one example of the invention it may be to first determine the state of the vehicle and then to obtain the target braking pressure in case of a jerk or a push of the vehicle.
The hydraulic control module 6 is used for controlling the opening or closing of the liquid inlet valve. In one example of the present invention, to ensure accurate control, the incremental pressure and flow rate under closed-loop control may be calculated from the target brake pressure and the target flow rate before controlling the opening or closing of the inlet valve, and then the opening timing and closing timing of the inlet valve may be determined from the incremental pressure and flow rate.
The invention has the beneficial effects that:
Through the technical scheme, the active pressure building method and the active pressure building system using the Ibooster controller are characterized in that the Ibooster controller is combined with the ESP system, the active pressure building and the cooperative control of the liquid inlet valve are performed on the combined active pressure building system, a USV/HSV valve system in an ESP actuator is omitted, and the high-efficiency control of the ESP system on the vehicle is realized with lower hardware cost. And, because of the characteristic of the accurate control of Ibooster controllers, the accuracy of the active voltage establishment of the VDC can be improved.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.

Claims (10)

1. An active voltage building method using Ibooster controller, characterized in that the active voltage building method comprises:
Acquiring a target braking pressure;
Calculating a target flow of brake fluid in a pipeline according to the target brake pressure;
Controlling the liquid inlet valves corresponding to the wheels to be braked to be opened;
Controlling the liquid inlet valves corresponding to the wheels which do not need braking to be closed;
and pressurizing the braking system according to the target flow by adopting a Ibooster controller.
2. The active pressure building method according to claim 1, characterized in that the active pressure building method comprises:
determining a state of the vehicle;
and under the condition that the vehicle is subjected to tail flick or head pushing, acquiring the target braking pressure.
3. The active pressure building method according to claim 1, wherein calculating a target flow rate of brake fluid in a pipe according to the target brake pressure includes:
And calculating the target flow according to the target braking pressure by using a Bernoulli equation.
4. The active pressure building method according to claim 1, characterized in that the active pressure building method comprises:
Calculating the incremental pressure and the flow rate under closed-loop control according to the target brake pressure and the target flow before controlling the feed-in valve to be opened or closed;
And determining the opening time and the closing time of the liquid inlet valve according to the increment pressure and the flow rate.
5. The active pressure building method according to claim 4, wherein the active pressure building method comprises:
When the liquid inlet valve is controlled to be opened or closed, the normally-open valve on the side where the wheel needing braking is located is opened, and the normally-open valve on the side where the wheel needing no braking is located is closed.
6. An active pressure building system utilizing Ibooster controllers, the active pressure building system comprising:
The electronic stability program control unit is used for acquiring a target braking force;
The external brake request module is used for calculating the target flow of the brake fluid in the pipeline according to the target brake pressure;
The hydraulic control module is used for:
Controlling the liquid inlet valves corresponding to the wheels to be braked to be opened;
Controlling the liquid inlet valves corresponding to the wheels which do not need braking to be closed;
And Ibooster the controller is used for pressurizing the braking system according to the target flow.
7. The active pressurization system of claim 6, wherein the electronic stability program control unit is configured to:
determining a state of the vehicle;
and under the condition that the vehicle is subjected to tail flick or head pushing, acquiring the target braking pressure.
8. The active pressurization system of claim 6, wherein the external braking request module is configured to:
And calculating the target flow according to the target braking pressure by using a Bernoulli equation.
9. The active pressure building system of claim 6, wherein the ESP control unit is configured to:
Calculating the incremental pressure and the flow rate under closed-loop control according to the target brake pressure and the target flow before controlling the feed-in valve to be opened or closed;
And determining the opening time and the closing time of the liquid inlet valve according to the increment pressure and the flow rate.
10. The active pressure building system according to claim 9, wherein the hydraulic control module is configured to open the normally open valve on the side where the wheel requiring braking is located and close the normally open valve on the side where the wheel not requiring braking is located when controlling the opening or closing of the intake valve.
CN202410358379.7A 2024-03-27 2024-03-27 Active pressure building method and system using Ibooster controller Pending CN118025095A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410358379.7A CN118025095A (en) 2024-03-27 2024-03-27 Active pressure building method and system using Ibooster controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410358379.7A CN118025095A (en) 2024-03-27 2024-03-27 Active pressure building method and system using Ibooster controller

Publications (1)

Publication Number Publication Date
CN118025095A true CN118025095A (en) 2024-05-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202410358379.7A Pending CN118025095A (en) 2024-03-27 2024-03-27 Active pressure building method and system using Ibooster controller

Country Status (1)

Country Link
CN (1) CN118025095A (en)

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