A vehicle brake control method, device, apparatus and system
By connecting the electronic power booster to the rear wheel cylinders of the vehicle, the system can directly control the wheel cylinders to clamp the rear wheel brakes in the event of an SCS malfunction, solving the problem that the driver needs to press the pedal hard when the SCS malfunctions and improving the driver's driving experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SAIC MOTOR
- Filing Date
- 2021-11-17
- Publication Date
- 2026-05-19
AI Technical Summary
When the vehicle stability control system (SCS) malfunctions, the electronic power steering cannot brake the vehicle through the SCS, causing the driver to have to press the pedal harder to generate enough pressure to brake the vehicle, resulting in a poor driving experience.
The electronic power steering system is connected to the wheel cylinders on the rear wheels of the vehicle. It receives braking trigger messages and directly controls the wheel cylinders to clamp the rear wheels to brake in the event of an SCS malfunction, thus preventing the driver from pressing the pedal.
In the event of a SCS malfunction, the electronic power steering can achieve vehicle braking without the driver having to press the pedal hard, thus improving the user experience.
Smart Images
Figure CN116135625B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle braking control, and in particular to a vehicle braking control method, device, equipment and system. Background Technology
[0002] A vacuum booster is a component in a vehicle located between the brake pedal and the master cylinder, which uses vacuum (negative pressure) to increase the force applied by the driver to the pedal. With the development of vehicle intelligence, electric vehicles have eliminated the vacuum source, making the continued use of vacuum boosters inconvenient. This has led to the development of electronic boosters, such as the iBooster, as alternatives to vacuum boosters.
[0003] The Stabilization Control System (SCS) is a standard electronic control module that includes multiple functional modules such as the Anti-lock Braking System (ABS), Electronic Stability Control (ESC), and Traction Control System (TCS). The SCS works in conjunction with the electronic power steering system to control the vehicle's braking.
[0004] Because the SCS (Supervisor Control System) may malfunction, the electronic brake assist cannot brake the vehicle through the SCS. In this case, braking is usually achieved by the driver pressing the pedal, generating braking force through a rigid connection between the vehicle's pedal pushrod and the pressure source that tightens the wheels. However, without the electronic brake assist, the driver needs to press the pedal harder to generate sufficient pressure to brake the vehicle, resulting in a poor driving experience.
[0005] Therefore, there is an urgent need for a solution to address the above problems. Summary of the Invention
[0006] The technical problem to be solved by this application is to provide a vehicle braking control method to solve the problem that the electronic booster cannot brake the vehicle through the SCS when the SCS malfunctions.
[0007] In a first aspect, embodiments of this application provide a vehicle braking method, the method being applied to an electronic power booster on a vehicle, the vehicle further including a stability control system (SCS), the electronic power booster being connected to wheel cylinders on the rear wheels of the vehicle, the method comprising:
[0008] Obtain a first vehicle braking trigger message, which is used to trigger the electronic power booster to brake the vehicle.
[0009] When the SCS malfunctions, the control wheel cylinder clamps the rear wheel to brake it.
[0010] Optionally, the first vehicle braking trigger message includes:
[0011] The advanced driver assistance system (ADAS) sends braking commands to the electronic booster, wherein the vehicle also includes the ADAS;
[0012] Alternatively, the first vehicle braking trigger message may include a braking signal generated when the vehicle's pedal opening degree reaches a preset opening degree threshold.
[0013] Optionally, when the vehicle is in motion, the SCS fault includes:
[0014] The SCS has a control anomaly, or the pressure output by the SCS to the wheel cylinder is less than a preset pressure threshold, or the SCS has a communication anomaly, or one or more of these conditions.
[0015] Optionally, when the vehicle is in a parked state, the SCS fault includes:
[0016] The SCS has a control malfunction, or the electronic parking brake (EPB) drive module of the SCS has failed.
[0017] Optionally, the method further includes:
[0018] When the electronic power booster malfunctions, the SCS receives a second vehicle braking trigger message through an angle sensor or stroke sensor connected to the pedal.
[0019] The SCS control wheel cylinder tightens the rear wheel to brake it.
[0020] Secondly, embodiments of this application provide a vehicle braking device, the device being applied to an electronic power booster on a vehicle, the vehicle further including a stability control system (SCS), the electronic power booster being connected to wheel cylinders on the rear wheels of the vehicle, the device comprising:
[0021] The acquisition module is configured to: acquire a first vehicle braking trigger message, wherein the first vehicle braking trigger message is used to trigger the electronic power booster to brake the vehicle;
[0022] The control module is used to: control the wheel cylinder to clamp the rear wheel to brake the rear wheel when the SCS fails.
[0023] Optionally, when the vehicle is in motion, the SCS fault includes:
[0024] The SCS has a control anomaly, or the pressure output by the SCS to the wheel cylinder is less than a preset pressure threshold, or the SCS has a communication anomaly, or one or more of these conditions.
[0025] Optionally, when the vehicle is in a parked state, the SCS fault includes:
[0026] The SCS has a control malfunction, or the electronic parking brake (EPB) drive module of the SCS has failed.
[0027] Thirdly, embodiments of this application provide a vehicle braking device, characterized in that the device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the vehicle braking method described in the first aspect.
[0028] Fourthly, embodiments of this application provide a vehicle braking system for implementing the vehicle braking method described in the first aspect.
[0029] Compared with the prior art, the embodiments of this application have the following advantages:
[0030] This application provides a vehicle braking method applied to an electronic power booster in a vehicle. The vehicle also includes a stability control system (SCS). The electronic power booster is connected to wheel cylinders on the rear wheels of the vehicle. The electronic power booster first acquires a first vehicle braking trigger message, which triggers the electronic power booster to brake the vehicle. When the SCS malfunctions, because the electronic power booster is connected to the wheel cylinders on the rear wheels, the driver does not need to press the pedal to generate braking force. The electronic power booster can directly control the wheel cylinders to clamp the rear wheels to brake them. Using this method, when the SCS malfunctions, the electronic power booster can directly brake the vehicle without the driver needing to press the pedal forcefully to generate sufficient braking pressure, thus improving the user experience. Attached Figure Description
[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0032] Figure 1 This is a schematic flowchart of a vehicle braking method according to an embodiment of this application;
[0033] Figure 2This is a schematic diagram of the structure of a vehicle braking device according to an embodiment of this application;
[0034] Figure 3 This is a schematic diagram of the structure of a vehicle braking device according to an embodiment of this application;
[0035] Figure 4 This is a schematic diagram of the structure of a vehicle braking system according to an embodiment of this application. Detailed Implementation
[0036] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.
[0037] The inventors of this application discovered through research that currently, due to potential malfunctions in the SCS (Supercharger System), the electronic brake-assist system (EBS) cannot achieve vehicle braking via the SCS. In this situation, braking is typically achieved by the driver depressing the pedal, generating braking force through a rigid connection between the vehicle's pedal pushrod and a pressure source that tightens the wheels. However, without an EBS, the driver needs to depress the pedal forcefully to generate sufficient pressure to brake the vehicle, resulting in a poor driving experience.
[0038] To address the aforementioned problems, this application provides a vehicle braking method applied to an electronic power booster in a vehicle. The vehicle also includes a stability control system (SCS), and the electronic power booster is connected to wheel cylinders on the rear wheels of the vehicle. The electronic power booster first acquires a first vehicle braking trigger message, which triggers the electronic power booster to brake the vehicle. When the SCS malfunctions, because the electronic power booster is connected to the wheel cylinders on the rear wheels, there is no need for the driver to depress the pedal to generate braking force. The electronic power booster can directly control the wheel cylinders to clamp the rear wheels to brake them. Using this method, when the SCS malfunctions, the electronic power booster can directly brake the vehicle without the driver having to forcefully depress the pedal to generate sufficient braking pressure, thus improving the user experience.
[0039] The various non-limiting embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0040] Exemplary methods
[0041] See Figure 1The diagram shows a schematic flowchart of a vehicle braking method according to an embodiment of this application. Figure 1 The method shown is applied to electronic power steering systems in vehicles.
[0042] In this embodiment, Figure 1 The method shown can be implemented, for example, through the following steps S101-S102.
[0043] S101: Obtain a first vehicle braking trigger message, which is used to trigger the electronic power booster to brake the vehicle.
[0044] In this embodiment, the electronic power booster can perform a braking operation on the vehicle based on a message for braking the vehicle. Therefore, in order to perform a braking operation on the vehicle, the electronic power booster can first obtain a first vehicle braking trigger message, which is used to trigger the electronic power booster to brake the vehicle.
[0045] In one example, the first vehicle braking trigger message may be a braking signal generated when the pedal opening degree of the vehicle reaches a preset threshold. For example, when the driver presses the pedal to reach the preset opening degree threshold, the pedal may generate and send the first vehicle braking trigger message to the electronic control unit (ECU) in the electronic power booster.
[0046] Considering that in autonomous driving scenarios, the driver may not press the pedal, and instead, the vehicle is controlled by an Advanced Driving Assistance System (ADAS). ADAS utilizes sensors such as cameras, radar, and lasers installed in the front and rear bumpers, side mirrors, inside the steering wheel, or on the windshield to detect light, heat, pressure, or other variables used to monitor the vehicle's status. It collects environmental data inside and outside the vehicle in real time, performing technical processing such as static and dynamic object identification, detection, and tracking. This allows it to detect potential hazards as quickly as possible and then control the vehicle or remind the driver to stay within the drivable area. Therefore, in one example, the first vehicle braking trigger message could be a braking command sent by ADAS to the electronic power steering system.
[0047] S102: When the SCS fails, the control wheel cylinder clamps the rear wheel to brake the rear wheel.
[0048] Currently, after receiving the first vehicle braking trigger message, the electronic power booster can perform the following operations to control vehicle braking: First, it requests its included pressure sensor or stroke sensor to parse the first vehicle braking trigger message. After parsing, it drives the included motor to establish a pressure corresponding to the parsing result in the master cylinder. Then, the master cylinder pushes high-pressure fluid into the SCS, which controls the wheel cylinders to brake the rear wheels of the vehicle.
[0049] Understandably, the above method requires the SCS (Supervisor Control System) to function properly. When the SCS malfunctions, the electronic brake assist cannot brake the vehicle via the SCS. In this case, the current method typically relies on a rigid connection between the vehicle's pedal pushrod and the pressure source that tightens the wheels, requiring the driver to depress the pedal to generate braking force. However, without the electronic brake assist, the driver needs to depress the pedal forcefully to generate sufficient pressure to brake the vehicle, resulting in a poor driving experience.
[0050] In this embodiment, since the electronic power booster is connected to the wheel cylinders on the rear wheels of the vehicle, when the SCS malfunctions, the driver does not need to press the pedal to generate braking force. The electronic power booster can control the wheel cylinders to clamp the rear wheels to brake them. Using this method, when the SCS malfunctions, the electronic power booster can directly brake the vehicle without the driver having to press the pedal forcefully to generate sufficient braking pressure, thus improving the user experience.
[0051] It should be noted that in this example, the electronic power booster is connected to the wheel cylinders on the rear wheels of the vehicle. It can be connected to the wheel cylinder on the left rear wheel, or it can be connected to the wheel cylinder on the right rear wheel, or it can be connected to the wheel cylinders on both rear wheels at the same time. This application embodiment does not limit this in any way.
[0052] Considering that the faults of the SCS may be different when the vehicle is in driving and parking states, the following describes the situation of the electronic power steering controlling the vehicle to brake when the vehicle is in driving and parking states respectively.
[0053] In one example, when the vehicle is in motion, a malfunction in the SCS (Supercharger Control System) could be due to one or more of the following: a control anomaly in the SCS, a pressure output by the SCS to the wheel cylinders being less than a preset pressure threshold, or a communication anomaly. A control anomaly could be a malfunction in the microcontroller unit (MCU) within the SCS; a pressure output by the SCS to the wheel cylinders being less than the preset pressure threshold could be a malfunction in the solenoid valve or motor within the SCS. In this case, the SCS cannot establish the pressure corresponding to the first vehicle braking trigger message. When the SCS malfunctions as described above, the electronic power steering typically controls the wheel cylinders to clamp the rear wheels to brake them. When the vehicle triggers the Anti-lock Braking System (ABS), the electronic power steering can adjust the motor output hydraulic pressure based on the received wheel speed information to prevent the vehicle's wheels from locking up.
[0054] In one example, when the vehicle is parked, a malfunction in the SCS could be due to a control anomaly or a failure of the Electronic Park Brake (EPB) drive module. When the SCS has a control anomaly, the electronic booster determines the operating status of the EPB drive module based on the gear shift signal and the drive motor speed signal, and then drives the EPB drive module to perform parking braking. When the EPB drive module of the SCS fails, the electronic booster drives a single-sided EPB drive module based on a signal from the SCS, thereby braking the vehicle.
[0055] It should be noted that when the electronic power booster malfunctions, the SCS can brake the vehicle. In one example, the SCS receives a second vehicle braking trigger message via an angle sensor or stroke sensor connected to the pedal. Then, the SCS controls the wheel cylinders to tighten the rear wheels to brake them. In this example, to prevent repeated pressure output to the wheel cylinders, the SCS can monitor the fault type of the electronic power booster: if the pressure output by the electronic power booster to the master cylinder is less than a preset pressure value, the SCS brakes the vehicle; if the electronic power booster experiences a non-pressure-building fault such as a communication error, the SCS will not directly brake the rear wheels based on the second vehicle braking trigger message.
[0056] Exemplary device
[0057] Based on the methods provided in the above embodiments, this application also provides an apparatus, which will be described below with reference to the accompanying drawings.
[0058] See Figure 2 This illustration shows a structural schematic diagram of a vehicle braking device according to an embodiment of this application. The device is applied to an electronic power booster on a vehicle, which also includes a stability control system (SCS). The electronic power booster is connected to wheel cylinders on the rear wheels of the vehicle. The device includes:
[0059] Acquisition module 201: used to acquire a first vehicle braking trigger message, the first vehicle braking trigger message being used to trigger the electronic power booster to brake the vehicle;
[0060] Control module 202: When the SCS fails, control the wheel cylinder to clamp the rear wheel to brake the rear wheel.
[0061] With this device, when the SCS malfunctions, the electronic power brake can directly brake the vehicle without the driver having to press the pedal hard enough to generate sufficient braking pressure, thus improving the user experience.
[0062] In one implementation, the first vehicle braking trigger message includes:
[0063] The advanced driver assistance system (ADAS) sends braking commands to the electronic booster, wherein the vehicle also includes the ADAS;
[0064] Alternatively, the first vehicle braking trigger message may include a braking signal generated when the vehicle's pedal opening degree reaches a preset opening degree threshold.
[0065] In one implementation, when the vehicle is in motion, the SCS fault includes:
[0066] The SCS has a control anomaly, or the pressure output by the SCS to the wheel cylinder is less than a preset pressure threshold, or the SCS has a communication anomaly, or one or more of these conditions.
[0067] In one implementation, when the vehicle is in a parked state, the SCS fault includes:
[0068] The SCS has a control malfunction, or the electronic parking brake (EPB) drive module of the SCS has failed.
[0069] Accordingly, this application also provides a vehicle braking device, see [link to relevant documentation]. Figure 3 As shown, it may include:
[0070] The device includes a processor 301, a memory 302, an input device 303, and an output device 304. The number of processors 301 in a vehicle braking system can be one or more. Figure 3 Taking a processor as an example. In some embodiments of the present invention, the processor 301, memory 302, input device 303, and output device 304 can be connected via a bus or other means, wherein, Figure 3 Taking the example of a connection between China and Israel via a bus.
[0071] The memory 302 can be used to store software programs and modules. The processor 301 executes the software programs and modules stored in the memory 302 to perform various functional applications and data processing of the vehicle braking device. The memory 302 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function, etc. In addition, the memory 302 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. The input device 303 can be used to receive input digital or character information, and generate signal inputs related to user settings and function control of the medical record information similarity analysis device.
[0072] Specifically in this embodiment, the processor 301 will load the executable files corresponding to the processes of one or more applications into the memory 302 according to the following instructions, and the processor 301 will run the applications stored in the memory 302 to realize the various functions in the above-mentioned vehicle braking method.
[0073] In addition, this application also provides a vehicle braking system, see [link to relevant documentation]. Figure 4 As shown, the system may include an electronic booster 401 and a stability control system 402, wherein the electronic booster 401 can perform the actions of the electronic booster in the exemplary method, and the stability control system 402 can perform the actions of the SCS in the rational method.
[0074] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.
[0075] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0076] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.
[0077] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A vehicle braking method, characterized in that, The method is applied to an electronic power booster in a vehicle, the vehicle also including a stability control system (SCS), the electronic power booster being connected to wheel cylinders on the rear wheels of the vehicle, the method comprising: Obtain a first vehicle braking trigger message, which is used to trigger the electronic power booster to brake the vehicle. When the SCS malfunctions, the control wheel cylinder clamps the rear wheel to brake it; wherein, when the vehicle is in driving mode, the SCS malfunction includes the pressure output by the SCS to the wheel cylinder being less than a preset pressure threshold; when the vehicle triggers the anti-lock braking system, the electronic power booster adjusts the motor output hydraulic pressure according to the received wheel speed information. When the vehicle is in a parked state, the SCS malfunction includes either a control abnormality in the SCS or a failure of the electronic parking brake (EPB) drive module of the SCS. When the SCS has a control abnormality, the electronic booster determines the working state of the EPB drive module and drives the EPB drive module to perform parking braking. When the EPB drive module of the SCS fails, the electronic booster drives a single-sided EPB drive module to work according to the signal sent by the SCS, thereby braking the vehicle.
2. The method according to claim 1, characterized in that, The first vehicle braking trigger message includes: The advanced driver assistance system (ADAS) sends braking commands to the electronic power booster, wherein the vehicle also includes the ADAS; Alternatively, the first vehicle braking trigger message may include a braking signal generated when the vehicle's pedal opening degree reaches a preset opening degree threshold.
3. The method according to any one of claims 1-2, characterized in that, The method further includes: When the electronic power booster malfunctions, the SCS receives a second vehicle braking trigger message through an angle sensor or stroke sensor connected to the pedal. The SCS control wheel cylinder tightens the rear wheel to brake it.
4. A vehicle braking device, characterized in that, The device is applied to an electronic power booster in a vehicle, the vehicle also including a stability control system (SCS), the electronic power booster being connected to wheel cylinders on the rear wheels of the vehicle, and the device comprising: The acquisition module is configured to: acquire a first vehicle braking trigger message, wherein the first vehicle braking trigger message is used to trigger the electronic power booster to brake the vehicle; The control module is used to: when the SCS fails, control the wheel cylinder to clamp the rear wheel to brake the rear wheel; wherein, when the vehicle is in a driving state, the SCS failure includes the pressure output by the SCS to the wheel cylinder being less than a preset pressure threshold; when the vehicle triggers the anti-lock braking system, the electronic booster adjusts the motor output hydraulic pressure according to the received wheel speed information. When the vehicle is in a parked state, the SCS malfunction includes either a control abnormality in the SCS or a failure of the electronic parking brake (EPB) drive module of the SCS. When the SCS has a control abnormality, the electronic booster determines the working state of the EPB drive module and drives the EPB drive module to perform parking braking. When the EPB drive module of the SCS fails, the electronic booster drives a single-sided EPB drive module to work according to the signal sent by the SCS, thereby braking the vehicle.
5. A vehicle braking device, characterized in that, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the vehicle braking method as described in any one of claims 1-2.
6. A vehicle braking system, characterized in that, The system is used to implement the vehicle braking method according to any one of claims 1-3.