Control method and control device of vehicle braking system, vehicle and storage medium

Abstract

The invention relates to a control method and a control device of a vehicle braking system, a vehicle and a storage medium, the vehicle braking system comprises a power stroke unit (PSU), a first solenoid valve, a second solenoid valve, a third solenoid valve, an energy accumulator and a brake fluid storage tank, and the volume of the energy accumulator at least allows a second volume of brake fluid to be stored. The method comprises the steps that when it is detected that the hydraulic brake assisting parking function is in an enabled state and a brake pedal is changed into a non-treaded state from a treaded state, a third electromagnetic valve is controlled to be opened, so that a second volume of brake fluid flows from brake calipers through the third electromagnetic valve and is stored in an energy accumulator; when it is detected that the braking action of the hydraulic braking assisting parking function is relieved, the first electromagnetic valve is controlled to be closed, and the second electromagnetic valve is controlled to be opened, so that the second volume of braking fluid flows back to the PSU from the energy accumulator through the second electromagnetic valve and then flows back to the braking fluid storage tank through the fluid supplementing opening and the communicating channel; therefore, brake fluid generated after pressurization of the brake control unit is discharged into the brake fluid storage tank from the brake calipers.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular to a control method, a control device, a vehicle and a storage medium for a vehicle braking system. Background Art

[0002] With the rapid development of the automotive industry, intelligence and electrification have become an irreversible trend, which has put forward higher requirements for vehicle safety, efficiency and environmental performance. In this wave of change, the vehicle braking system, as a core element of vehicle safety, is undergoing a transformation from a traditional purely mechanical structure to a highly integrated electronic control system. This transformation not only enhances braking performance, but also significantly improves response speed and energy efficiency, providing drivers with a safer and more efficient travel experience.

[0003] In this context, the integration of intelligent power-assist units and brake control units has emerged as a key technical path to promote the intelligent upgrade of vehicle brake systems. This solution achieves instant response and precise control of braking operations by finely regulating the brake fluid pressure, greatly enhancing the vehicle's handling stability and safety under complex road conditions. However, after the brake control unit is pressurized, how to discharge the brake fluid generated by the brake control unit from the brake caliper to the brake fluid storage tank is a problem that needs to be solved urgently. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present disclosure provides a control method, a control device, a vehicle and a storage medium for a vehicle braking system.

[0005] According to a first aspect of an embodiment of the present disclosure, a control method for a vehicle braking system is provided, the vehicle braking system comprising a power stroke unit PSU, a first solenoid valve, a second solenoid valve, a third solenoid valve, an accumulator and a brake fluid storage tank, the PSU is provided with a fluid replenishing port, a communication channel is provided between the fluid replenishing port and the brake fluid storage tank, the first solenoid valve is provided on a first fluid path for conveying a first volume of brake fluid generated when a brake pedal is stepped on, the second solenoid valve is provided on a second fluid path for conveying a second volume of brake fluid generated when a hydraulic brake booster auxiliary parking function is enabled, the third solenoid valve is provided on a third fluid path for conveying the second volume of brake fluid from the brake caliper to the accumulator, the volume of the accumulator at least allows the second volume of brake fluid to be stored, the method comprising:

[0006] In response to detecting that the hydraulic brake power assist parking function is in an activated state and the brake pedal changes from a stepped state to an unstepped state, controlling the third solenoid valve to open so that the second volume of brake fluid flows from the brake caliper through the third solenoid valve to and is stored in the accumulator;

[0007] In response to detecting that the braking action of the hydraulic brake power-assisted parking function is released, the first solenoid valve is controlled to close and the second solenoid valve is controlled to open, so that the second volume of brake fluid flows back from the accumulator to the PSU through the second solenoid valve, and then flows back to the brake fluid storage tank through the fluid replenishing port and the connecting channel.

[0008] In one embodiment of the present disclosure, before controlling the third solenoid valve to open, the method further includes:

[0009] The first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, so that the first volume of brake fluid flows back from the brake caliper through the first solenoid valve to the PSU, and then flows back to the brake fluid storage tank through the fluid replenishing port and the connecting channel.

[0010] In one embodiment of the present disclosure, during the process of the first volume of brake fluid flowing back to the PSU, the method further includes:

[0011] acquiring a movement stroke of a first piston in the PUS and a first pressure when the first volume of brake fluid flows out of the first solenoid valve;

[0012] In response to the movement stroke reaching the target stroke and the first pressure being within a set pressure range, the process of determining that the first volume of brake fluid flows back to the PSU ends.

[0013] In one embodiment of the present disclosure, in response to detecting that the braking action of the hydraulic brake booster parking assisted function is released, the method further includes:

[0014] The ESP motor in the vehicle braking system is controlled to start, and the eccentric pump is driven by the ESP motor to work, so as to speed up the speed of returning the second volume of brake fluid stored in the accumulator to the PSU.

[0015] In one embodiment of the present disclosure, the accumulator comprises: a spring, a second piston and a cylinder, wherein the second piston is connected to one end of the cylinder through the spring; wherein:

[0016] In response to a second pressure of the brake fluid outside the accumulator being greater than an upper limit of a set pressure range, the second piston moves in a direction of compression of the spring to increase the available space in the cylinder, allowing the brake fluid to flow into the accumulator for storage;

[0017] In response to the second pressure of the brake fluid outside the accumulator being less than the lower limit of the set pressure range, the second piston moves in the direction of the spring expansion to reduce the available space in the cylinder body, and the brake fluid stored in the accumulator flows out.

[0018] In one embodiment of the present disclosure, in response to detecting that the hydraulic brake power assist parking function is in an enabled state and before the brake pedal changes from a stepped state to an unstepped state, the method further includes:

[0019] In response to the hydraulic brake power-assisted parking function being enabled and the brake pedal being not stepped on, the first solenoid valve is controlled to be closed, the second solenoid valve is controlled to be opened, and the ESP motor in the vehicle braking system is controlled to be turned on. The ESP motor drives the eccentric pump to work, and the second volume of brake fluid flowing out of the brake fluid tank is discharged into the brake caliper by the eccentric pump after passing through the second solenoid valve.

[0020] In one embodiment of the present disclosure, in response to detecting that the hydraulic brake power assist parking function is in an enabled state and before the brake pedal changes from a stepped state to an unstepped state, the method further includes:

[0021] In response to the hydraulic brake power-assisted parking function being enabled and the brake pedal being stepped on, the first solenoid valve is controlled to open, the second solenoid valve is controlled to close, and the APM motor in the vehicle braking system is turned on. The APM motor pushes the PSU, and the first volume of brake fluid flowing out of the brake fluid tank first flows into the PSU, and then flows into the brake caliper after passing through the first solenoid valve.

[0022] In one embodiment of the present disclosure, the third solenoid valve is a normally closed solenoid valve.

[0023] According to a second aspect of an embodiment of the present disclosure, a control device for a vehicle braking system is provided, the vehicle braking system comprising a power stroke unit PSU, a first solenoid valve, a second solenoid valve, a third solenoid valve, an accumulator and a brake fluid storage tank, the PSU is provided with a fluid replenishing port, a connecting passage is provided between the fluid replenishing port and the brake fluid storage tank, the first solenoid valve is provided on a first fluid path for conveying a first volume of brake fluid generated when a brake pedal is stepped on, the second solenoid valve is provided on a second fluid path for conveying a second volume of brake fluid generated when a hydraulic brake booster auxiliary parking function is enabled, the third solenoid valve is provided on a third fluid path for conveying the second volume of brake fluid from the brake caliper to the accumulator, and the volume of the accumulator allows at least The device for storing the second volume of brake fluid includes: a first control module, which is used to control the third solenoid valve to open when it is detected that the hydraulic brake power-assisted parking function is in an enabled state and the brake pedal changes from a stepped state to an unstepped state, so that the second volume of brake fluid flows from the brake caliper through the third solenoid valve to and is stored in the accumulator; a second control module, which is used to control the first solenoid valve to close and the second solenoid valve to open when it is detected that the braking action of the hydraulic brake power-assisted parking function is released, so that the second volume of brake fluid flows from the accumulator through the second solenoid valve back to the PSU, and then flows back to the brake fluid storage tank through the fluid replenishing port and the connecting channel.

[0024] In one embodiment of the present disclosure, the device further includes:

[0025] The third control module is used to control the first solenoid valve to open and the second solenoid valve to close before the first control module controls the third solenoid valve to open, so that the first volume of brake fluid flows back from the brake caliper to the PSU through the first solenoid valve, and then flows back to the brake fluid storage tank through the fluid replenishing port and the connecting channel.

[0026] In one embodiment of the present disclosure, the third control module is further used to:

[0027] During the process of the first volume of brake fluid flowing back to the PSU, obtaining a movement stroke of a first piston in the PSU and a first pressure when the first volume of brake fluid flows out of the first solenoid valve;

[0028] In response to the movement stroke reaching the target stroke and the first pressure being within a set pressure range, the process of determining that the first volume of brake fluid flows back to the PSU ends.

[0029] In one embodiment of the present disclosure, the second control module is further configured to:

[0030] When it is detected that the braking action of the hydraulic brake power-assisted parking function is released, the ESP motor in the vehicle braking system is controlled to start, and the eccentric pump is driven by the ESP motor to speed up the return of the second volume of brake fluid stored in the accumulator to the PSU.

[0031] In one embodiment of the present disclosure, the accumulator comprises: a spring, a second piston and a cylinder, wherein the second piston is connected to one end of the cylinder through the spring; wherein:

[0032] In response to a second pressure of the brake fluid outside the accumulator being greater than an upper limit of a set pressure range, the second piston moves in a direction of compression of the spring to increase the available space in the cylinder, allowing the brake fluid to flow into the accumulator for storage;

[0033] In response to the second pressure of the brake fluid outside the accumulator being less than the lower limit of the set pressure range, the second piston moves in the direction of the spring expansion to reduce the available space in the cylinder body, and the brake fluid stored in the accumulator flows out.

[0034] In one embodiment of the present disclosure, in response to detecting that the hydraulic brake boost assisted parking function is in an enabled state and before the brake pedal changes from a stepped state to an unstepped state, the first control module is further configured to:

[0035] In response to the hydraulic brake power-assisted parking function being enabled and the brake pedal being not stepped on, the first solenoid valve is controlled to be closed, the second solenoid valve is controlled to be opened, and the ESP motor in the vehicle braking system is controlled to be turned on. The ESP motor drives the eccentric pump to work, and the second volume of brake fluid flowing out of the brake fluid tank is discharged into the brake caliper by the eccentric pump after passing through the second solenoid valve.

[0036] In one embodiment of the present disclosure, in response to detecting that the hydraulic brake boost assisted parking function is in an enabled state and before the brake pedal changes from a stepped state to an unstepped state, the first control module is further configured to:

[0037] In response to the hydraulic brake power-assisted parking function being enabled and the brake pedal being stepped on, the first solenoid valve is controlled to open, the second solenoid valve is controlled to close, and the APM motor in the vehicle braking system is turned on. The APM motor pushes the PSU, and the first volume of brake fluid flowing out of the brake fluid tank first flows into the PSU, and then flows into the brake caliper after passing through the first solenoid valve.

[0038] In one embodiment of the present disclosure, the third solenoid valve is a normally closed solenoid valve.

[0039] According to a third aspect of an embodiment of the present disclosure, a vehicle is provided, comprising:

[0040] processor;

[0041] a memory for storing processor-executable instructions;

[0042] Wherein, the processor is configured to:

[0043] The steps for implementing the above-mentioned vehicle braking system control method are as follows.

[0044] According to a fourth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored. When the program instructions are executed by a processor, the steps of the above-mentioned vehicle braking system control method are implemented.

[0045] According to a fifth aspect of an embodiment of the present disclosure, a computer program product is provided. When an instruction processor in the computer program product is executed, the steps of the above-mentioned vehicle braking system control method are executed.

[0046] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0047] In the present disclosure, the vehicle brake system of the present disclosure includes a power stroke unit PSU, a first solenoid valve, a second solenoid valve and a third solenoid valve, an accumulator and a brake fluid storage tank, a fluid replenishing port is provided on the PSU, a communication channel is provided between the fluid replenishing port and the brake fluid storage tank, the first solenoid valve is provided on a first fluid path for conveying a first volume of brake fluid generated when a brake pedal is stepped on, the second solenoid valve is provided on a second fluid path for conveying a second volume of brake fluid generated when a hydraulic brake booster auxiliary parking function is enabled, the third solenoid valve is provided on a third fluid path for conveying the second volume of brake fluid from a brake caliper to the accumulator, and the accumulator The volume allows at least the second volume of brake fluid to be stored. When the hydraulic brake booster assisted parking function is detected to be in an enabled state and the brake pedal changes from a stepped state to an unstepped state, the present disclosure controls the third solenoid valve to open so that the second volume of brake fluid flows from the brake caliper through the third solenoid valve to and is stored in the accumulator. When the braking action of the hydraulic brake booster assisted parking function is detected to be released, the first solenoid valve is controlled to close and the second solenoid valve is controlled to open so that the second volume of brake fluid flows from the accumulator through the second solenoid valve back to the PSU, and then flows back to the brake fluid storage tank through the fluid replenishment port and the communication channel. Thus, the present disclosure increases the volume of the accumulator, such as increasing it to at least allow the storage of the second volume of brake fluid generated when the hydraulic brake booster assisted parking function is enabled, and then controls the first solenoid valve, the second solenoid valve and the third solenoid valve to discharge the second volume of brake fluid from the brake caliper into the accumulator for temporary storage, and then actively discharges it from the accumulator to the brake fluid storage tank after the braking action is released, thereby completing the discharge of the brake fluid generated after the brake control unit is pressurized from the brake caliper to the brake fluid storage tank.

[0048] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0050] Figure 1 is a schematic diagram of a vehicle braking system according to an embodiment of the present disclosure;

[0051] Figure 2 is a flow diagram of brake fluid when a hydraulic brake booster parking assisted function is enabled in a vehicle brake system according to an embodiment of the present disclosure;

[0052] Figure 3 is a flow diagram of brake fluid when a brake pedal is stepped on in a vehicle brake system according to an embodiment of the present disclosure;

[0053] Figure 4is a flow chart of a method for controlling a vehicle braking system according to an embodiment of the present disclosure;

[0054] Figure 5 is a reflux diagram of brake fluid when a braking action of a hydraulic brake booster assisted parking function in a vehicle brake system according to an embodiment of the present disclosure is released;

[0055] Figure 6 is a reflux diagram of brake fluid when a brake pedal in a vehicle brake system changes from a stepped state to an unstepped state according to an embodiment of the present disclosure;

[0056] Figure 7 is a block diagram of a control device for a vehicle braking system according to an embodiment of the present disclosure;

[0057] Figure 8 It is a schematic diagram of a functional block diagram of a vehicle according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0058] Some embodiments of the present disclosure will be described in detail here, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. Various changes, modifications and equivalents of the methods, devices and / or systems described herein will become apparent after understanding the present disclosure. For example, the order of operations described herein is merely an example and is not limited to those orders set forth herein, but can be changed as becomes apparent after understanding the present disclosure, except for operations that must be performed in a specific order. In addition, for clarity and brevity, descriptions of features known in the art may be omitted.

[0059] The embodiments described in some embodiments of the present disclosure below do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0060] The following describes a control method, a control device, a vehicle, and a storage medium for a vehicle braking system according to an embodiment of the present disclosure with reference to the accompanying drawings.

[0061] Figure 1 is a schematic diagram of a vehicle braking system according to an embodiment of the present disclosure.

[0062] like Figure 1As shown, the vehicle braking system of the embodiment of the present disclosure includes: a power stroke unit PSU, a first solenoid valve, a second solenoid valve, a third solenoid valve, an accumulator and a brake fluid storage tank, the PSU is provided with a fluid replenishing port, a connecting channel is provided between the fluid replenishing port and the brake fluid storage tank, the first solenoid valve is arranged on a first fluid circuit for conveying a first volume of brake fluid generated when the brake pedal is stepped on, the second solenoid valve is arranged on a second fluid circuit for conveying a second volume of brake fluid generated when a hydraulic brake power assist parking function is enabled, the third solenoid valve is arranged on a third fluid circuit for conveying the second volume of brake fluid from the brake caliper to the accumulator, the volume of the accumulator allows at least the second volume of brake fluid to be stored, for example, the volume of the accumulators A1 and A2 is usually less than 5.5cc, while the present disclosure sets the volume of the accumulators A1 and A2 to more than 10cc.

[0063] Among them, the first solenoid valve includes RV1 valve and RV2 valve, the second solenoid valve includes SV1 valve and SV2 valve, the third solenoid valve includes OV1F valve, OV1R valve, OV2F valve and OV2R valve, OV1F valve, OV1R valve, OV2F valve and OV2R valve are normally closed solenoid valves, the accumulator includes A1 and A2, the brake fluid storage tank includes a large oil pot and a small oil pot, the small oil pot is composed of MCC1, MCC2 and MCC3, and the brake caliper includes 1F, 1R, 2F, 2R.

[0064] The vehicle braking system further includes: a first master cylinder, a second master cylinder, a CSV1 valve, a CSV2 valve, a BSV1 valve, a BSV2 valve, a PSV1 valve, a PSV2 valve, an IV1F valve, an IV1R valve, an IV2F valve, an IV2R valve, an ESP motor, and an APM motor. The first master cylinder and the second master cylinder are connected to the brake pedal, the ESP motor is connected to the eccentric pump (the eccentric pump includes the first eccentric pump and the second eccentric pump), and the APM motor is connected to the PSU.

[0065] When the brake pedal is not depressed, the vehicle braking system triggers the automatic braking function (for example, the vehicle braking system performs a 0.5g deceleration), the CSV1 valve, CSV2 valve, PSV1 valve, PSV2 valve, OV1F valve, OV1R valve, OV2F valve, OV2R valve, RV1 valve and RV2 valve are closed, the ESP motor drives the eccentric pump to work, and the second volume of brake fluid is discharged from the MCC1 and MCC2 of the small oil tank into the calipers 1F, 1R, 2F, 2R. The second volume of brake fluid path is as follows Figure 2 As shown, it includes: MCC1→BSV1 valve→SV1 valve→1V1F valve→brake caliper 1F, MCC1→BSV1 valve→SV1 valve→1V1R valve→brake caliper 1R, MCC2→BSV2 valve→SV2 valve→1V2F valve→brake caliper 2F, MCC2→BSV2 valve→SV2 valve→1V2R valve→brake caliper 2R.

[0066] On the basis of the vehicle braking system triggering the automatic braking function, the driver now steps on the brake pedal to increase the vehicle braking force (for example, the vehicle braking system performs a 0.8g deceleration), the CSV1 valve, CSV2 valve, BSV1 valve, BSV2 valve\OV1F valve, OV1R valve, OV2F valve, OV2R valve, SV1 valve and SV2 valve are closed, the APM motor rotates, the PSU operates (the first piston in the boost cylinder pushes forward), and the first volume of brake fluid is discharged from the small oil pot MCC3 into the calipers 1F, 1R, 2F, 2R. The first volume of brake fluid path is as follows Figure 3 As shown, including: MCC2→PSU→PSV1 valve→RV1 valve→1V1F valve→brake caliper 1F, MCC2→PSU→PSV1 valve→RV1 valve→1V1R valve→brake caliper 1R, MCC2→PSU→PSV2 valve→RV2 valve→1V2F valve→brake caliper 2F, MCC2→PSU→PSV2 valve→RV2 valve→1V2R valve→brake caliper 2R.

[0067] Figure 4 is a flow chart of a control method of a vehicle braking system according to an embodiment of the present disclosure.

[0068] like Figure 4 As shown, the control method of the vehicle braking system of the embodiment of the present disclosure includes:

[0069] S1, in response to detecting that the hydraulic brake power assist parking function is in an enabled state and the brake pedal changes from a stepped state to an unstepped state, controlling the third solenoid valve to open so that a second volume of brake fluid flows from the brake caliper through the third solenoid valve to and is stored in the accumulator.

[0070] That is, when the driver releases the power pedal, but the hydraulic brake power assist parking function of the vehicle is still enabled, the third solenoid valve, namely the OV1F valve, the OV1R valve, the OV2F valve and the OV2R valve, are all controlled to open, so that the brake fluid in the brake calipers 1F and 1R flows to and is stored in the accumulator A1 through the OV1F valve and the OV1R valve, and the brake fluid in the brake calipers 2F and 2R flows to and is stored in the accumulator A2 through the OV2F valve and the OV2R valve. It should be noted that half of the second volume of brake fluid is stored in the accumulator A1 and the accumulator A2.

[0071] S2, in response to detecting that the braking action of the hydraulic brake power-assisted parking function is released, controls the first solenoid valve to close and the second solenoid valve to open, so that the second volume of brake fluid flows back from the accumulator to the PSU through the second solenoid valve, and then flows back to the brake fluid storage tank through the fluid replenishing port and the connecting channel.

[0072] After the braking action of the hydraulic brake booster parking assisted function is released, the first solenoid valve RV1 and RV2 are controlled to be closed, and the second solenoid valve SV1 and SV2 are controlled to be opened. At this time, the PSV1 valve and the PSV2 valve are still in the open state. The flow direction of the second volume of brake fluid is as follows: Figure 5 As shown, it includes: 1 / 2 of the second volume of brake fluid from accumulator A1→SV1 valve→PSV1 valve→PSU→fluid filling port→connecting channel→MCC3 of the small oil pot in the brake fluid storage tank, and 1 / 2 of the second volume of brake fluid from accumulator A2→SV2 valve→PSV2 valve→PSU→fluid filling port→connecting channel→MCC3 of the small oil pot in the brake fluid storage tank.

[0073] Therefore, the present invention increases the volume of the accumulator, such as to a level that can at least allow the storage of the second volume of brake fluid generated when the hydraulic brake power-assisted parking function is enabled, and then controls the first solenoid valve, the second solenoid valve and the third solenoid valve to discharge the second volume of brake fluid from the brake caliper into the accumulator for temporary storage, and then actively discharges the second volume of brake fluid from the accumulator to the brake fluid storage tank after the braking action is released, thereby completing the discharge of the brake fluid generated after the brake control unit is pressurized from the brake caliper to the brake fluid storage tank.

[0074] In one embodiment of the present disclosure, before controlling the third solenoid valve to open, the method further includes:

[0075] The first solenoid valve is controlled to open and the second solenoid valve is controlled to close, so that the first volume of brake fluid flows back from the brake caliper through the first solenoid valve to the PSU, and then flows back to the brake fluid storage tank through the fluid replenishing port and the connecting channel.

[0076] In the present disclosure, when it is detected that the hydraulic brake booster parking assisted function is in the enabled state and the brake pedal changes from the stepped state to the unstepped state, the first solenoid valves RV1 and RV2 are first controlled to be opened and the second solenoid valves SV1 and SV2 are closed. At this time, the PSV1 valve and the PSV2 valve are still in the open state. The flow direction of the first volume of brake fluid is as follows: Figure 6 As shown, it includes: 1 / 4 of the first volume of brake fluid respectively flows from brake calipers 1F and 1R→RV1 valve→PSV1 valve→PSU→fluid filling port→connecting channel→MCC3 of the small oil pot in the brake fluid storage tank, and 1 / 4 of the first volume of brake fluid respectively flows from brake calipers 2F and 2R→RV2 valve→PSV2 valve→PSU→fluid filling port→connecting channel→MCC3 of the small oil pot in the brake fluid storage tank.

[0077] When the first volume of brake fluid flows to the PSU, the third solenoid valve is controlled to open, so that the second volume of brake fluid flows from the brake caliper through the third solenoid valve and is stored in the accumulator. After the braking action of the hydraulic brake booster parking assisted function is released, the first solenoid valves RV1 and RV2 are controlled to close, and the second solenoid valves SV1 and SV2 are controlled to open. The flow direction of the second volume of brake fluid is as follows: Figure 5 As shown, it includes: 1 / 2 of the second volume of brake fluid from accumulator A1→SV1 valve→PSV1 valve→PSU→fluid filling port→connecting channel→MCC3 of the small oil pot in the brake fluid storage tank, and 1 / 2 of the second volume of brake fluid from accumulator A2→SV2 valve→PSV2 valve→PSU→fluid filling port→connecting channel→MCC3 of the small oil pot in the brake fluid storage tank.

[0078] In one embodiment of the present disclosure, during the process of the first volume of brake fluid flowing back to the PSU, it is necessary to obtain the moving stroke of the first piston in the PUS and the first pressure when the first volume of brake fluid flows out from the first solenoid valve, and judge whether the process of the first volume of brake fluid flowing back to the PSU is completed based on the moving stroke and the first pressure. For example, when the moving stroke reaches the target stroke and the first pressure is within the set pressure range, it is determined that the process of the first volume of brake fluid flowing back to the PSU is completed; otherwise, it is determined that the process of the first volume of brake fluid flowing back to the PSU is not completed.

[0079] In order to speed up the return of the second volume of brake fluid stored in the accumulator to the PSU and ensure the efficiency of discharging the second volume of brake fluid, after detecting that the braking action of the hydraulic brake power-assisted parking function is released, the ESP motor in the vehicle braking system is also controlled to start, and the eccentric pump is driven by the ESP motor to quickly pump the second volume of brake fluid out of accumulators A1 and A2.

[0080] In one embodiment of the present disclosure, an accumulator includes: a spring, a second piston and a cylinder body, wherein the second piston is connected to one end of the cylinder body through the spring; wherein, in response to a second pressure of the brake fluid outside the accumulator being greater than an upper limit value of a set pressure range, the second piston moves in a direction of spring compression to increase the available space in the cylinder body, allowing the brake fluid to flow into the accumulator for storage; and in response to a second pressure of the brake fluid outside the accumulator being less than a lower limit value of the set pressure range, the second piston moves in a direction of spring relaxation to reduce the available space in the cylinder body, allowing the brake fluid stored in the accumulator to flow out.

[0081] In one embodiment of the present disclosure, in response to detecting that the hydraulic brake power assist parking function is in an enabled state and before the brake pedal changes from a stepped state to an unstepped state, the method further includes:

[0082] In response to the hydraulic brake power-assisted parking function being enabled and the brake pedal being not stepped on, the first solenoid valve is controlled to close, the second solenoid valve is controlled to open, and the ESP motor in the vehicle braking system is controlled to start. The ESP motor drives the eccentric pump to work, and the second volume of brake fluid flowing out of the brake fluid tank passes through the second solenoid valve and is discharged into the brake caliper by the eccentric pump.

[0083] In the present disclosure, when the hydraulic brake booster parking assisted function is enabled and the brake pedal is not stepped on, the second volume brake fluid path is as follows: Figure 2 As shown, it includes: MCC1→BSV1 valve→SV1 valve→1V1F valve→brake caliper 1F, MCC1→BSV1 valve→SV1 valve→1V1R valve→brake caliper 1R, MCC2→BSV2 valve→SV2 valve→1V2F valve→brake caliper 2F, MCC2→BSV2 valve→SV2 valve→1V2R valve→brake caliper 2R.

[0084] In one embodiment of the present disclosure, in response to detecting that the hydraulic brake power assist parking function is in an enabled state and before the brake pedal changes from a stepped state to an unstepped state, the method further includes:

[0085] In response to the hydraulic brake power-assisted parking function being enabled and the brake pedal being stepped on, the first solenoid valve is controlled to open, the second solenoid valve is controlled to close, and the APM motor in the vehicle braking system is turned on. The APM motor pushes the PSU, and the first volume of brake fluid flowing out of the brake fluid tank first flows into the PSU, and then flows into the brake caliper after passing through the first solenoid valve.

[0086] In the present disclosure, when the hydraulic brake booster parking assisted function is in an activated state and the brake pedal is in a stepped state, the first volume brake fluid path is as follows: Figure 3 As shown, including: MCC2→PSU→PSV1 valve→RV1 valve→1V1F valve→brake caliper 1F, MCC2→PSU→PSV1 valve→RV1 valve→1V1R valve→brake caliper 1R, MCC2→PSU→PSV2 valve→RV2 valve→1V2F valve→brake caliper 2F, MCC2→PSU→PSV2 valve→RV2 valve→1V2R valve→brake caliper 2R.

[0087] In summary, in the present disclosure, the vehicle brake system of the present disclosure includes a power stroke unit PSU, a first solenoid valve, a second solenoid valve, a third solenoid valve, an accumulator and a brake fluid storage tank, a fluid replenishing port is provided on the PSU, a communication channel is provided between the fluid replenishing port and the brake fluid storage tank, the first solenoid valve is provided on a first fluid path for conveying a first volume of brake fluid generated when a brake pedal is stepped on, the second solenoid valve is provided on a second fluid path for conveying a second volume of brake fluid generated when a hydraulic brake booster auxiliary parking function is enabled, the third solenoid valve is provided on a third fluid path for conveying the second volume of brake fluid from a brake caliper to the accumulator, and the accumulator The volume of the accumulator allows at least the second volume of brake fluid to be stored. When the hydraulic brake booster assisted parking function is detected to be in the enabled state and the brake pedal changes from the stepped state to the unstepped state, the present disclosure controls the third solenoid valve to open so that the second volume of brake fluid flows from the brake caliper to and is stored in the accumulator through the third solenoid valve, and when the braking action of the hydraulic brake booster assisted parking function is detected to be released, the first solenoid valve is controlled to close and the second solenoid valve is controlled to open so that the second volume of brake fluid flows from the accumulator through the second solenoid valve to the PSU, and then flows back to the brake fluid storage tank through the fluid replenishment port and the communication channel. Thus, the present disclosure increases the volume of the accumulator, such as increasing it to at least allow the storage of the second volume of brake fluid generated when the hydraulic brake booster assisted parking function is enabled, and then controls the first solenoid valve, the second solenoid valve and the third solenoid valve to discharge the second volume of brake fluid from the brake caliper into the accumulator for temporary storage, and then actively discharges it from the accumulator to the brake fluid storage tank after the braking action is released, thereby completing the discharge of the brake fluid generated after the brake control unit is pressurized from the brake caliper to the brake fluid storage tank.

[0088] Figure 7 is a block diagram of a control device for a vehicle braking system according to an embodiment of the present disclosure.

[0089] like Figure 7 As shown, the control device 700 of the vehicle braking system in the embodiment of the present disclosure includes: a first control module 710 and a second control module 720.

[0090] The first control module 710 is used to control the third solenoid valve to open when it is detected that the hydraulic brake power-assisted parking function is in an enabled state and the brake pedal changes from a stepped state to an unstepped state, so that the second volume of brake fluid flows from the brake caliper through the third solenoid valve and is stored in the accumulator. The second control module 720 is used to control the first solenoid valve to close and the second solenoid valve to open when it is detected that the braking action of the hydraulic brake power-assisted parking function is released, so that the second volume of brake fluid flows back from the accumulator through the second solenoid valve to the PSU, and then flows back to the brake fluid storage tank through the fluid replenishment port and the connecting channel.

[0091] In one embodiment of the present disclosure, the above-mentioned device further includes:

[0092] The third control module is used to control the first solenoid valve to open and the second solenoid valve to close before the first control module controls the third solenoid valve to open, so that the first volume of brake fluid flows back from the brake caliper to the PSU through the first solenoid valve, and then flows back to the brake fluid storage tank through the fluid replenishing port and the connecting channel.

[0093] In one embodiment of the present disclosure, the third control module is further used to:

[0094] When the first volume of brake fluid flows back to the PSU, a moving stroke of the first piston in the PSU and a first pressure when the first volume of brake fluid flows out from the first solenoid valve are obtained;

[0095] In response to the movement stroke reaching the target stroke and the first pressure being within the set pressure range, the process of determining that the first volume of brake fluid flows back to the PSU ends.

[0096] In one embodiment of the present disclosure, the second control module 720 is further configured to:

[0097] When it is detected that the braking action of the hydraulic brake power-assisted parking function is released, the ESP motor in the vehicle braking system is controlled to start, and the eccentric pump is driven by the ESP motor to speed up the return of the second volume of brake fluid stored in the accumulator to the PSU.

[0098] In one embodiment of the present disclosure, the accumulator includes: a spring, a second piston and a cylinder, wherein the second piston is connected to one end of the cylinder through the spring; wherein,

[0099] In response to a second pressure of the brake fluid outside the accumulator being greater than an upper limit of the set pressure range, the second piston moves in a direction of spring compression to increase the available space in the cylinder, allowing the brake fluid to flow into the accumulator for storage;

[0100] In response to the second pressure of the brake fluid outside the accumulator being less than the lower limit of the set pressure range, the second piston moves in the direction of the spring expansion to reduce the available space in the cylinder body and the brake fluid stored in the accumulator flows out.

[0101] In one embodiment of the present disclosure, in response to detecting that the hydraulic brake boost assisted parking function is in an enabled state and before the brake pedal changes from a stepped state to an unstepped state, the first control module 710 is further configured to:

[0102] In response to the hydraulic brake power-assisted parking function being enabled and the brake pedal being not stepped on, the first solenoid valve is controlled to close, the second solenoid valve is controlled to open, and the ESP motor in the vehicle braking system is controlled to start. The ESP motor drives the eccentric pump to work, and the second volume of brake fluid flowing out of the brake fluid tank passes through the second solenoid valve and is discharged into the brake caliper by the eccentric pump.

[0103] In one embodiment of the present disclosure, in response to detecting that the hydraulic brake boost assisted parking function is in an enabled state and before the brake pedal changes from a stepped state to an unstepped state, the first control module 710 is further configured to:

[0104] In response to the hydraulic brake power-assisted parking function being enabled and the brake pedal being stepped on, the first solenoid valve is controlled to open, the second solenoid valve is controlled to close, and the APM motor in the vehicle braking system is turned on. The APM motor pushes the PSU, and the first volume of brake fluid flowing out of the brake fluid tank first flows into the PSU, and then flows into the brake caliper after passing through the first solenoid valve.

[0105] In one embodiment of the present disclosure, the third solenoid valve is a normally closed solenoid valve.

[0106] It should be noted that for details not disclosed in the control device of the vehicle braking system of the embodiment of the present disclosure, please refer to the details disclosed in the control method of the vehicle braking system of the embodiment of the present disclosure, and the details will not be repeated here.

[0107] In the present disclosure, the vehicle brake system of the present disclosure includes a power stroke unit PSU, a first solenoid valve, a second solenoid valve, a third solenoid valve, an accumulator and a brake fluid storage tank, a fluid replenishing port is provided on the PSU, a communication channel is provided between the fluid replenishing port and the brake fluid storage tank, the first solenoid valve is provided on a first fluid path for conveying a first volume of brake fluid generated when a brake pedal is stepped on, the second solenoid valve is provided on a second fluid path for conveying a second volume of brake fluid generated when a hydraulic brake booster auxiliary parking function is enabled, the third solenoid valve is provided on a third fluid path for conveying the second volume of brake fluid from a brake caliper to the accumulator, and the volume of the accumulator allows at least storage of The second volume of brake fluid, when the present disclosure detects that the hydraulic brake booster assisted parking function is in the enabled state and the brake pedal changes from the stepped state to the unstepped state, the first control module controls the third solenoid valve to open, so that the second volume of brake fluid flows from the brake caliper through the third solenoid valve to and is stored in the accumulator, and when the braking action of the hydraulic brake booster assisted parking function is detected to be released, the second control module controls the first solenoid valve to close and the second solenoid valve to open, so that the second volume of brake fluid flows from the accumulator through the second solenoid valve to the PSU, and then flows back to the brake fluid storage tank through the fluid replenishment port and the communication channel. Thus, the present disclosure increases the volume of the accumulator, such as increasing it to at least allow the storage of the second volume of brake fluid generated when the hydraulic brake booster assisted parking function is enabled, and then controls the first solenoid valve, the second solenoid valve and the third solenoid valve to discharge the second volume of brake fluid from the brake caliper into the accumulator for temporary storage, and then actively discharges it from the accumulator to the brake fluid storage tank after the braking action is released, thereby completing the discharge of the brake fluid generated after the brake control unit is pressurized from the brake caliper to the brake fluid storage tank.

[0108] Based on the above embodiments, the present disclosure further proposes a vehicle, comprising:

[0109] processor;

[0110] a memory for storing processor-executable instructions;

[0111] Wherein, the processor is configured to:

[0112] The steps for implementing the above-mentioned vehicle braking system control method are as follows.

[0113] As an example, Figure 8 1 is a functional block diagram of a vehicle 100 shown in an exemplary embodiment. For example, the vehicle 100 may be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicles. The vehicle 100 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0114] Reference Figure 8The vehicle 100 may also include various other subsystems, such as an infotainment system 1110, a perception system 1120, a decision control system 1130, a drive system 1140, and a computing platform 1150. The vehicle 100 may also include more or fewer subsystems, and each subsystem may include multiple components. In addition, each subsystem and each component of the vehicle 100 may be interconnected by wire or wireless means.

[0115] In some embodiments, the infotainment system 1110 may include a communication system, an entertainment system, and a navigation system, etc.

[0116] The perception system 1120 may include several sensors for sensing information about the environment around the vehicle 100. For example, the perception system 1120 may include a global positioning system (the global positioning system may be a GPS system, or a Beidou system or other positioning systems), an inertial measurement unit (IMU), a laser radar, a millimeter wave radar, an ultrasonic radar, and a camera.

[0117] The decision control system 1130 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0118] The drive system 1140 may include components that provide powered motion for the vehicle 100. In one embodiment, the drive system 1140 may include an engine, an energy source, a transmission system, and wheels. The engine may be one or a combination of an internal combustion engine, an electric motor, and an air compression engine. The engine is capable of converting energy provided by the energy source into mechanical energy.

[0119] Some or all functions of the vehicle 100 are controlled by a computing platform 1150. The computing platform 1150 may include at least one processor 1151 and a memory 1152, and the processor 1151 may execute instructions 1153 stored in the memory 1152.

[0120] The processor 1151 may be any conventional processor, such as a commercially available CPU. The processor may also include a graphics processor (Graphic Process Unit, GPU), a field programmable gate array (Field Programmable Gate Array, FPGA), a system on chip (System on Chip, SOC), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC) or a combination thereof.

[0121] Memory 1152 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0122] In addition to instructions 1153 , memory 1152 may also store data, such as road maps, route information, and data such as the location, direction, and speed of the vehicle. The data stored in memory 1152 may be used by computing platform 1150 .

[0123] In the embodiment of the present disclosure, the processor 1151 may execute instruction 1153 to complete all or part of the steps of the above-mentioned vehicle positioning method.

[0124] The present disclosure also provides a computer-readable storage medium having computer program instructions stored thereon. When the program instructions are executed by a processor, the steps of the vehicle braking system control method provided by the present disclosure are implemented.

[0125] The present disclosure also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the steps of the vehicle braking system control method provided by the present disclosure are implemented.

[0126] In addition, the word "exemplary" is used herein to indicate serving as an example, instance, or diagram. Any aspect or design described as "exemplary" in this article is not necessarily understood to be advantageous compared to other aspects or designs. On the contrary, the use of the word exemplary is intended to present concepts in a specific way. As used herein, the term "or" is intended to represent an inclusive "or" rather than an exclusive "or". That is, unless otherwise specified or clear from the context, "X applies A or B" is intended to represent any one of the natural inclusive arrangements. That is, if X applies A; X applies B; or X applies both A and B, "X applies A or B" is satisfied under any of the aforementioned examples. In addition, unless otherwise specified or clearly pointed to a singular form from the context, the articles "one" and "an" as used in this application and the appended claims are generally understood to mean "one or more".

[0127] Likewise, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art after reading and understanding the specification and drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components (e.g., elements, resources, etc.) described above, unless otherwise noted, the terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific functions of the described components, even if the structure is not equivalent to the disclosed structure. In addition, although the specific features of the present disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations as may be desired and conducive to any given or specific application. In addition, with respect to "including", "having", "having", "having", or variations thereof used in the specific embodiments or claims, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0128] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0129] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method for controlling a vehicle braking system, characterized in that: The vehicle brake system comprises a power stroke unit PSU, a first solenoid valve, a second solenoid valve, a third solenoid valve, an accumulator and a brake fluid storage tank, the PSU is provided with a fluid filling port, a communication channel is provided between the fluid filling port and the brake fluid storage tank, the first solenoid valve is provided on a first fluid path for conveying a first volume of brake fluid generated when a brake pedal is stepped on, the second solenoid valve is provided on a second fluid path for conveying a second volume of brake fluid generated when a hydraulic brake booster auxiliary parking function is enabled, the third solenoid valve is provided on a third fluid path for conveying the second volume of brake fluid from the brake caliper to the accumulator, the volume of the accumulator at least allows the storage of the second volume of brake fluid, and the method comprises: In response to detecting that the hydraulic brake power assist parking function is in an activated state and the brake pedal changes from a stepped state to an unstepped state, controlling the third solenoid valve to open so that the second volume of brake fluid flows from the brake caliper through the third solenoid valve to and is stored in the accumulator; In response to detecting that the braking action of the hydraulic brake power-assisted parking function is released, the first solenoid valve is controlled to close and the second solenoid valve is controlled to open, so that the second volume of brake fluid flows back from the accumulator to the PSU through the second solenoid valve, and then flows back to the brake fluid storage tank through the fluid replenishing port and the connecting channel.

2. The method according to claim 1, characterized in that Before the controlling the third solenoid valve to open, the method further comprises: The first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed, so that the first volume of brake fluid flows back from the brake caliper through the first solenoid valve to the PSU, and then flows back to the brake fluid storage tank through the fluid replenishing port and the connecting channel.

3. The method according to claim 2, characterized in that During the process in which the first volume of brake fluid flows back to the PSU, the method further includes: acquiring a movement stroke of a first piston in the PUS and a first pressure when the first volume of brake fluid flows out of the first solenoid valve; In response to the movement stroke reaching the target stroke and the first pressure being within a set pressure range, the process of determining that the first volume of brake fluid flows back to the PSU ends.

4. The method according to claim 1, characterized in that: In response to detecting that the braking action of the hydraulic brake power assist parking function is released, the method further includes: The ESP motor in the vehicle braking system is controlled to start, and the eccentric pump is driven by the ESP motor to work, so as to speed up the speed of returning the second volume of brake fluid stored in the accumulator to the PSU.

5. The method according to claim 1, characterized in that The accumulator comprises: a spring, a second piston and a cylinder, wherein the second piston is connected to one end of the cylinder through the spring; wherein In response to a second pressure of the brake fluid outside the accumulator being greater than an upper limit of a set pressure range, the second piston moves in a direction of compression of the spring to increase the available space in the cylinder, allowing the brake fluid to flow into the accumulator for storage; In response to the second pressure of the brake fluid outside the accumulator being less than the lower limit of the set pressure range, the second piston moves in the direction of the spring expansion to reduce the available space in the cylinder body, and the brake fluid stored in the accumulator flows out.

6. The method according to any one of claims 1 to 5, characterized in that In response to detecting that the hydraulic brake power assist parking function is in an enabled state and before the brake pedal changes from a stepped state to an unstepped state, the method further includes: In response to the hydraulic brake power-assisted parking function being enabled and the brake pedal being not stepped on, the first solenoid valve is controlled to be closed, the second solenoid valve is controlled to be opened, and the ESP motor in the vehicle braking system is controlled to be turned on. The ESP motor drives the eccentric pump to work, and the second volume of brake fluid flowing out of the brake fluid tank is discharged into the brake caliper by the eccentric pump after passing through the second solenoid valve.

7. The method according to any one of claims 1 to 5, characterized in that In response to detecting that the hydraulic brake power assist parking function is in an enabled state and before the brake pedal changes from a stepped state to an unstepped state, the method further includes: In response to the hydraulic brake power-assisted parking function being enabled and the brake pedal being stepped on, the first solenoid valve is controlled to open, the second solenoid valve is controlled to close, and the APM motor in the vehicle braking system is turned on. The APM motor pushes the PSU, and the first volume of brake fluid flowing out of the brake fluid tank first flows into the PSU, and then flows into the brake caliper after passing through the first solenoid valve.

8. The method according to claim 1, characterized in that The third solenoid valve is a normally closed solenoid valve.

9. A control device for a vehicle braking system, characterized in that: The vehicle brake system comprises a power stroke unit PSU, a first solenoid valve, a second solenoid valve, a third solenoid valve, an accumulator and a brake fluid storage tank, the PSU is provided with a fluid filling port, a communication channel is provided between the fluid filling port and the brake fluid storage tank, the first solenoid valve is provided on a first fluid path for conveying a first volume of brake fluid generated when a brake pedal is stepped on, the second solenoid valve is provided on a second fluid path for conveying a second volume of brake fluid generated when a hydraulic brake booster auxiliary parking function is enabled, the third solenoid valve is provided on a third fluid path for conveying the second volume of brake fluid from the brake caliper to the accumulator, the volume of the accumulator allows at least the second volume of brake fluid to be stored, and the device comprises: a first control module, configured to control the third solenoid valve to open when detecting that the hydraulic brake power assist parking function is in an enabled state and the brake pedal changes from a stepped state to an unstepped state, so that the second volume of brake fluid flows from the brake caliper through the third solenoid valve to and is stored in the accumulator; The second control module is used for controlling the first solenoid valve to close and the second solenoid valve to open when it is detected that the braking action of the hydraulic brake power-assisted parking function is released, so that the second volume of brake fluid flows back from the accumulator to the PSU through the second solenoid valve, and then flows back to the brake fluid storage tank through the fluid replenishing port and the connecting channel.

10. The device according to claim 9, characterized in that The device also includes: The third control module is used to control the first solenoid valve to open and the second solenoid valve to close before the first control module controls the third solenoid valve to open, so that the first volume of brake fluid flows back from the brake caliper to the PSU through the first solenoid valve, and then flows back to the brake fluid storage tank through the fluid replenishing port and the connecting channel.

11. A vehicle, characterized in that: include: processor; a memory for storing processor-executable instructions; Wherein, the processor is configured to: Implement the steps of the vehicle braking system control method described in any one of claims 1-8.

12. A computer-readable storage medium having computer program instructions stored thereon, characterized in that: When the program instructions are executed by a processor, the steps of the vehicle braking system control method described in any one of claims 1 to 8 are implemented.

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