A vehicle deceleration braking method and a vehicle deceleration braking system

Abstract

The application discloses a vehicle deceleration braking method, comprising the following steps: sending braking request information to an electronic parking brake system; in response to the received braking request information, sending a deceleration braking signal to an electronic brake booster through the electronic parking brake system; in response to the received deceleration braking signal, activating an electronic control deceleration function by using the electronic brake booster, and actively pressurizing a brake pipeline of the vehicle by using the electronic brake booster through a preset braking execution mode, so that the vehicle realizes deceleration braking. The vehicle deceleration braking method provided by the application can realize the electronic control deceleration function and achieve the purpose of safe deceleration parking on a vehicle without a vehicle body electronic stability control system, only by using the electronic parking brake system and the electronic brake booster.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and in particular to a vehicle deceleration and braking method and a vehicle deceleration and braking system. Background Technology

[0002] In recent years, automobiles have become increasingly electronic and intelligent. The technology of using Electronic Stability Controller (ESC) to actively boost and achieve electronic deceleration has been widely used in the automotive industry, providing people with a more convenient way to park.

[0003] Existing electronic parking brake (EPB) systems use electronic control to perform multiple functions, including static parking and dynamic control. EPB's dynamic control is typically achieved through Electronic Controlled Deceleration (ECD) and Rear Wheel Unlock (RWU), with ECD generally handled by ESC. However, vehicles equipped only with an Anti-lock Braking System (ABS) and lacking ESC cannot achieve electronic deceleration, meaning the driver cannot safely slow the vehicle down using functions other than the service brake.

[0004] Therefore, it is necessary to provide improved technical solutions to overcome the above-mentioned technical problems existing in the prior art. Summary of the Invention

[0005] In view of the above problems, the purpose of this invention is to provide a vehicle deceleration and braking method for vehicles without ESC, which can realize electronic control deceleration function in vehicles equipped only with ABS, so as to achieve safe deceleration and stopping.

[0006] This invention provides a vehicle deceleration and braking method, applicable to vehicles equipped with an electronic parking brake system, an electronic brake booster, and an anti-lock braking system. The method comprises: sending a braking request message to the electronic parking brake system; responding to the received braking request message, sending a deceleration braking signal to the electronic brake booster through the electronic parking brake system; responding to the received deceleration braking signal, activating an electronically controlled deceleration function using the electronic brake booster, and using the electronic brake booster to actively pressurize the vehicle's brake lines through a preset braking execution mode, thereby achieving vehicle deceleration and braking.

[0007] Furthermore, sending braking request information to the electronic parking brake system includes: keeping the brake switch of the electronic parking brake system in the pulled-up state for a predetermined period of time to generate braking request information; and sending the braking request information to the electronic parking brake system through a signal transmission circuit.

[0008] Furthermore, the vehicle deceleration and braking method further includes the following steps: before activating the electronic control deceleration function using the electronic brake booster, the electronic brake booster is used to confirm whether the current state of the vehicle meets the conditions for activating the electronic control deceleration function, and the braking execution mode corresponding to the electronic control deceleration function is determined.

[0009] Furthermore, the braking execution mode includes a first braking mode, which includes: when the current state of the vehicle meets the conditions for activating the electronic control deceleration function, using the electronic brake booster to generate a braking drive signal, and controlling the motor of the electronic brake booster to generate the required pressure in the master cylinder of the vehicle through the braking drive signal.

[0010] Furthermore, the vehicle deceleration and braking method further includes: when the vehicle speed decreases to a preset deceleration threshold, using the electronic brake booster to control and increase the mechanical braking force of the mechanical caliper of the electronic parking brake system, and using the electronic brake booster to control the vehicle's brake lines to reduce the hydraulic braking force, so that the vehicle speed gradually decreases until it stops.

[0011] Furthermore, the vehicle deceleration and braking method further includes: during the execution of the electronically controlled deceleration function, when the accelerator pedal of the vehicle is depressed, interrupting the execution of the electronically controlled deceleration function.

[0012] Furthermore, the braking execution mode also includes a second braking mode, which includes: when the wheel speed sensor of the vehicle is in an abnormal state, but the vehicle meets the conditions for activating the electronic control deceleration function, the electronic brake booster is used to control the vehicle to decelerate and brake according to a preset minimum deceleration.

[0013] Furthermore, the vehicle deceleration and braking method further includes: when the electronic control deceleration function is activated, if the electronic brake booster detects an abnormality in the execution of the electronic control deceleration function, the execution process of the electronic control deceleration function is interrupted, and the rear wheels of the vehicle are controlled by the anti-lock braking system to perform anti-lock braking deceleration.

[0014] Furthermore, the vehicle deceleration and braking method further includes: when the electronic brake booster performs the electronically controlled deceleration function, simultaneously controlling the vehicle to issue an indication signal indicating that the electronically controlled deceleration function is activated.

[0015] The present invention also provides a vehicle deceleration and braking system, including an electronic parking brake system, an electronic brake booster, and an anti-lock braking system; the electronic parking brake system is used to respond to a received braking request information and send a deceleration braking signal to the electronic brake booster; the electronic brake booster is used to respond to the received deceleration braking signal, activate the electronic control deceleration function, and control the vehicle's brake lines to actively increase pressure through a preset braking execution mode, so that the vehicle can achieve deceleration braking; the anti-lock braking system is used to control the rear wheels of the vehicle to perform anti-lock braking deceleration when the electronic control deceleration function malfunctions.

[0016] The vehicle deceleration and braking method and system provided by the present invention send a deceleration and braking signal to the electronic brake booster through the electronic parking brake system. After receiving the deceleration and braking signal, the electronic brake booster controls and executes the electronic control deceleration function. In vehicles equipped only with ABS and not ESC, the electronic control deceleration function can be achieved through the electronic parking brake system and the electronic brake booster, so as to achieve the purpose of safe deceleration and stopping. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart of a vehicle deceleration and braking method provided in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of a system structure for implementing a vehicle deceleration and braking method according to an embodiment of the present invention. Detailed Implementation

[0020] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of preferred embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding can be gained of the technical means and effects adopted by the present invention to achieve its intended purpose. However, the accompanying drawings are for reference and illustration only and are not intended to limit the present invention; some well-known parts may not be shown. In the various drawings, the same elements are represented by similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0021] Figure 1 This is a flowchart illustrating a vehicle deceleration and braking method according to an embodiment of the present invention. Figure 1 As shown, an embodiment of the present invention provides a vehicle deceleration and braking method, applicable to a vehicle equipped with an electronic parking brake system, an electronic brake booster, and an anti-lock braking system. The vehicle deceleration and braking method includes:

[0022] Step S01: Send a braking request message to the electronic parking brake system;

[0023] In one embodiment, the electronic parking brake (EPB) system includes an EPB brake switch and an EPB controller. Sending braking request information to the electronic parking brake system includes: keeping the EPB brake switch in an engaged state for a predetermined duration to generate an electrical signal representing the braking request information; and sending the electrical signal representing the braking request information to the EPB controller via a signal transmission circuit. In other embodiments, the duration for which the EPB switch is engaged and the degree of engagement are also related to a set braking execution mode. That is, a corresponding braking execution mode is set according to different durations and degrees of engagement of the EPB switch. Under different braking execution modes, the braking effect or braking response sensitivity is different.

[0024] Step S02: In response to the received braking request information, a deceleration braking signal is sent to the electronic brake booster through the electronic parking brake system;

[0025] In one embodiment, after receiving the braking request information sent by the EPB brake switch, the EPB controller sends a deceleration braking signal to the electronic brake booster via the CAN bus.

[0026] Step S03: In response to the received deceleration and braking signal, the electronic control deceleration function is activated using the electronic brake booster, and the electronic brake booster is used to actively pressurize the vehicle's brake lines through a preset braking execution mode, so that the vehicle can decelerate and brake.

[0027] In one embodiment, after receiving a deceleration braking signal via the CAN bus, the electronic brake booster confirms whether the vehicle's current state meets the conditions for activating the electronic control deceleration function before activating it, and determines the braking execution mode corresponding to the electronic control deceleration function. Specifically, for example... Figure 2 As shown in the schematic diagram of a system structure for implementing a vehicle deceleration and braking method according to an embodiment of the present invention, the electronic brake booster can determine whether the current state of the vehicle meets the conditions for activating the electronic control deceleration function and execute the braking execution mode corresponding to the electronic control deceleration function based on the status signals sent by various modules of the vehicle through the CAN bus and the level signals representing the status information sent through the signal connection circuit (hard wire). For example, engine speed and torque signals can be obtained from the vehicle's engine management system (EMS), transmission gear signals and clutch engagement signals can be obtained from the transmission control unit (TCU), seat belt locking signals can be obtained from the airbag system (SRS), and corresponding status signals can be obtained from the body control system (BCM), gateway system (GW), electronic parking brake system (EPB), etc. These status signals are used to determine whether each module is in a normal working state and will not affect the execution of the electronic control deceleration function. The electronic brake booster also confirms whether the wheel speed sensor is working normally through the wheel speed pulse signals sent by the wheel speed sensor and obtains the current wheel speed of the vehicle in real time. It also determines whether the engine power supply is working normally through the ignition switch signal sent by the ignition switch power supply system (IGN). Electronic brake boosters identify and determine the current state of the vehicle through various signals, and select different braking execution modes according to the different current states of the vehicle.

[0028] In one embodiment, the braking execution mode includes a first braking mode, which includes: when the current state of the vehicle meets the conditions for activating the electronically controlled deceleration function, using an electronic brake booster to generate a braking drive signal, and controlling the motor of the electronic brake booster to generate the required pressure in the vehicle's master cylinder through the braking drive signal. Specifically, the electronic brake booster may include a brake control unit, a booster motor, a booster transmission mechanism, and a master cylinder push rod. When the brake control unit of the electronic brake booster detects that the various modules of the vehicle are operating normally and the current vehicle speed is above a preset deceleration threshold, the brake control unit of the electronic brake booster will apply a preset parking braking force curve (e.g., the vehicle reaches 6 m / s² within 2 seconds). 2The deceleration of the brake booster generates a braking drive signal. Under the control of the braking drive signal, the booster motor outputs power, causing the booster transmission mechanism to work and drive the master cylinder push rod to move, which in turn drives the piston of the master cylinder to move, generating the hydraulic braking force required for deceleration within the master cylinder. It is understood that the above specific implementation method for executing the braking mode through an electronic brake booster is merely a illustrative description of the technology, and not a limitation thereof.

[0029] In one embodiment, when the vehicle speed decreases to a preset deceleration threshold, an electronic brake booster is used to control and increase the mechanical braking force of the mechanical calipers of the electronic parking brake system, and the electronic brake booster is used to control the vehicle's brake lines to reduce the hydraulic braking force, so that the vehicle speed gradually decreases until it stops, ensuring the smoothness of vehicle deceleration.

[0030] In one embodiment, during the execution of the electronically controlled deceleration function, the execution of the electronically controlled deceleration function is interrupted when the vehicle's accelerator pedal is depressed.

[0031] In one embodiment, the braking execution mode further includes a second braking mode, which includes: when the wheel speed sensor of the vehicle is abnormal, but the vehicle meets the conditions for activating the electronic control deceleration function, the electronic brake booster is used to control the vehicle to decelerate and brake according to a preset minimum deceleration. For example, when the electronic brake booster determines that the wheel speed sensor is faulty or malfunctioning based on the wheel speed pulse signal sent by the wheel speed sensor, the electronic brake booster will decelerate and brake according to a preset minimum deceleration of 2 m / s. 2 Dynamic parking is achieved by reducing speed, further ensuring the safety of vehicle operation.

[0032] In one embodiment, when the electronically controlled deceleration function is activated, if the electronic brake booster detects an abnormality in the execution of the electronically controlled deceleration function, the execution process of the electronically controlled deceleration function is interrupted, and the anti-lock braking system controls the rear wheels of the vehicle to perform anti-lock braking deceleration. Specifically, when the electronic parking brake system sends a deceleration braking signal, if the electronic brake booster receives the deceleration braking signal and detects that the electronically controlled deceleration function cannot be implemented, or if there is no response when the electronically controlled deceleration function is executed, or if the deceleration during the execution of the electronically controlled deceleration function cannot reach the preset minimum deceleration, for example, 2 m / s², then... 2 When this occurs, the electronic brake booster will interrupt the execution of the electronically controlled deceleration function, and the ABS will activate the RWU function to achieve anti-lock braking deceleration by implementing anti-lock braking on the rear wheels of the vehicle, enabling the vehicle to achieve safe braking even when the electronically controlled deceleration braking function is abnormal.

[0033] When the electronic brake booster performs electronically controlled deceleration, it simultaneously controls the vehicle to send an indication signal indicating that the electronically controlled deceleration function is activated. For example, when the electronic brake booster performs electronically controlled deceleration, it simultaneously sends an electronically controlled deceleration activation signal to the CAN bus. Upon receiving the electronically controlled deceleration activation signal, the vehicle's instrument cluster (IP) illuminates instrument lights to indicate to the driver that the vehicle is undergoing safe deceleration.

[0034] This invention also provides a vehicle deceleration and braking system, including an electronic parking brake system, an electronic brake booster, and an anti-lock braking system. In one embodiment, the electronic parking brake system includes an EPB brake switch and an EPB controller. The EPB brake switch generates an electrical signal representing a braking request when it remains in an engaged state for a predetermined time, and sends this signal to the EPB controller via a signal transmission circuit. The EPB controller responds to the received braking request by sending a deceleration braking signal to the electronic brake booster. The electronic brake booster includes a brake control unit and a brake actuator. The brake control unit responds to the received deceleration braking signal by activating the electronic control deceleration function and, according to a preset braking execution mode, controls the vehicle's brake lines to actively increase pressure via the brake actuator to achieve deceleration braking. The anti-lock braking system controls the rear wheels of the vehicle to perform anti-lock braking deceleration when the electronic control deceleration function malfunctions.

[0035] The vehicle deceleration and braking method and system provided by this invention send a deceleration and braking signal to an electronic brake booster through an electronic parking brake system. After receiving the deceleration and braking signal, the electronic brake booster controls and executes the electronic control deceleration function. The electronic parking brake system only acts as a module for sending deceleration and braking signals. When performing electronic control deceleration and braking, the electronic brake booster acts as both the controller and the actuator of the electronic deceleration and braking function. Even in vehicles equipped with only ABS and no ESC, the electronic control deceleration function can be realized to achieve the purpose of safe deceleration and stopping.

[0036] In the description of this invention, unless otherwise expressly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms based on the specific circumstances. The terms "first," "second," etc., are merely used to distinguish elements with similar properties and are not intended to indicate or imply relative importance or a specific order. The terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, encompassing not only the listed elements but also other elements not expressly listed.

[0037] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A vehicle deceleration and braking method, applied to vehicles equipped with an electronic parking brake system, an electronic brake booster, and an anti-lock braking system, characterized in that, The vehicle deceleration and braking method includes: Send braking request information to the electronic parking brake system; In response to the received braking request information, a deceleration braking signal is sent to the electronic brake booster through the electronic parking brake system; In response to the received deceleration and braking signal, the electronic brake booster is used to confirm whether the current state of the vehicle meets the conditions for activating the electronic control deceleration function, and to determine the braking execution mode corresponding to the electronic control deceleration function. The electronic brake booster is used to activate the electronic control deceleration function, and the electronic brake booster is used to control the vehicle's brake lines to actively increase pressure through the corresponding braking execution mode, so that the vehicle can achieve deceleration braking. The braking execution mode includes a first braking mode and a second braking mode; The first braking mode includes: when the current state of the vehicle meets the conditions for activating the electronic control deceleration function, using the electronic brake booster to generate a braking drive signal, and controlling the motor of the electronic brake booster to generate the required pressure in the brake master cylinder of the vehicle through the braking drive signal; The second braking mode includes: when the wheel speed sensor of the vehicle is abnormal, but the vehicle meets the conditions for activating the electronic control deceleration function, the electronic brake booster is used to control the vehicle to decelerate and brake according to a preset minimum deceleration.

2. The vehicle deceleration and braking method according to claim 1, characterized in that, Sending braking request information to the electronic parking brake system includes: The brake switch of the electronic parking brake system is kept in the pulled-up state for a predetermined period of time to generate a braking request message; The braking request information is sent to the electronic parking brake system via a signal transmission circuit.

3. The vehicle deceleration and braking method according to claim 1, characterized in that, Also includes: When the vehicle speed decreases to a preset deceleration threshold, the electronic brake booster is used to control and increase the mechanical braking force of the mechanical calipers of the electronic parking brake system, and the electronic brake booster is used to control and decrease the hydraulic braking force of the vehicle's brake lines, so that the vehicle speed gradually decreases until it stops.

4. The vehicle deceleration and braking method according to claim 3, characterized in that, Also includes: During the execution of the electronically controlled deceleration function, the execution process of the electronically controlled deceleration function is interrupted when the accelerator pedal of the vehicle is pressed.

5. The vehicle deceleration and braking method according to claim 4, characterized in that, Also includes: When the electronically controlled deceleration function is activated, if the electronic brake booster detects an abnormality in the execution of the electronically controlled deceleration function, the execution process of the electronically controlled deceleration function is interrupted, and the anti-lock braking system controls the rear wheels of the vehicle to perform anti-lock braking deceleration.

6. The vehicle deceleration and braking method according to claim 1, characterized in that, Also includes: When the electronic brake booster performs the electronically controlled deceleration function, it simultaneously controls the vehicle to issue an indication signal indicating that the electronically controlled deceleration function is activated.

7. A vehicle deceleration and braking system for implementing the vehicle deceleration and braking method as described in any one of claims 1 to 6, the system comprising an electronic parking brake system, an electronic brake booster, and an anti-lock braking system; The electronic parking brake system is used to send a deceleration braking signal to the electronic brake booster in response to the received braking request information. The electronic brake booster is used to respond to the received deceleration braking signal, activate the electronic control deceleration function, and control the vehicle's brake lines to actively increase pressure through a preset braking execution mode, so that the vehicle can achieve deceleration braking. The anti-lock braking system is used to control the rear wheels of the vehicle to perform anti-lock braking deceleration when the electronic control deceleration function malfunctions.

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