Brake fluid leakage detection method and system and vehicle

Abstract

The invention discloses a brake fluid leakage detection method and system and a vehicle, and belongs to the technical field of vehicle braking. The detection method comprises the following steps: acquiring first actual pressure and actual stroke; and the first hydraulic volume and the actual hydraulic volume are calculated, and the current first brake fluid leakage amount is obtained according to the actual hydraulic volume and the first hydraulic volume. The first hydraulic volume in the servo cylinder is calculated according to the first pressure of the servo cylinder, the position of a push rod can be represented according to the stroke of the push rod in the servo cylinder at the moment, and then the nominal theoretical liquid volume is obtained according to the standard relation between the stroke of the push rod and the volume of the servo cylinder, namely a parameter relation curve. The theoretical liquid volume and the first hydraulic volume are analyzed through a contrast, the first brake fluid leakage amount can be calculated, the first brake fluid leakage amount can accurately collect the leakage condition of the integrated brake control system, and therefore the safety condition of a vehicle can be known according to the first brake fluid leakage amount.

Description

Technical Field

[0001] This invention relates to the field of vehicle braking technology, and in particular to a method, system and vehicle for detecting brake fluid leakage. Background Technology

[0002] The integrated electro-hydraulic braking system is one of the most important systems for ensuring vehicle driving safety. It includes a reservoir for storing brake fluid, a master cylinder that responds to braking demands, actuators that drive the wheel cylinders to achieve braking, and hydraulic lines connecting these components. The actuators, such as servo cylinders, have multiple valves on the hydraulic lines that control the on / off state of the lines. The wheel cylinders rely on hydraulic pressure to achieve braking; if the braking system leaks, insufficient braking force will affect vehicle driving safety.

[0003] Currently, integrated brake control systems store preset pressures corresponding to different brake pedal depress depths. When the driver depresses the brake pedal to brake the vehicle, the corresponding preset pressure is retrieved based on the depress depth, and the actual pressure of the servo cylinder is measured. The measured pressure is then compared with the preset pressure. If the measured pressure is lower than the preset pressure, it indicates a brake fluid leak. However, the above leak detection method cannot accurately calculate the amount of brake fluid leakage. Summary of the Invention

[0004] The purpose of this invention is to provide a brake fluid leakage detection method, system, and vehicle to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0005] To address the aforementioned technical problems, the present invention provides a brake fluid leakage detection method, applicable to a vehicle with an integrated brake control system. The integrated brake control system includes a servo cylinder, which comprises a push rod for actuating brake fluid. The detection method includes: acquiring a first actual pressure of the servo cylinder and an actual stroke of the push rod; calculating a first hydraulic volume of the servo cylinder based on the first actual pressure; obtaining the actual hydraulic volume of the servo cylinder based on a parameter relationship curve, wherein the parameter relationship curve characterizes the relationship between the push rod stroke and the servo cylinder volume; and obtaining the current first brake fluid leakage amount based on the actual hydraulic volume and the first hydraulic volume.

[0006] This technical solution has at least the following beneficial effects: the first hydraulic volume in the servo cylinder is calculated based on the first pressure of the servo cylinder, and the position of the push rod can be characterized based on the stroke of the push rod in the servo cylinder at this time. Then, the nominal theoretical liquid volume is obtained based on the standard relationship between the push rod stroke and the volume of the servo cylinder, i.e., the parameter relationship curve. By comparing the theoretical liquid volume and the first hydraulic volume, the first brake fluid leakage can be calculated. The first brake fluid leakage can accurately characterize the leakage of the integrated brake control system, which is beneficial for understanding the safety status of the vehicle based on the first brake fluid leakage.

[0007] Optionally, calculating the first hydraulic volume based on the first actual pressure includes: obtaining the braking movement speed of the push rod; and calculating the first hydraulic volume based on the first actual pressure and the braking movement speed.

[0008] Optionally, the detection method further includes: when the integrated brake control system pressurizes, acquiring a second actual pressure of the servo cylinder; when the second actual pressure increases to a preset pressure, acquiring a second hydraulic volume and a second moment of the servo cylinder; when the integrated brake control system depressurizes, acquiring a third actual pressure of the servo cylinder; when the third actual pressure decreases to the preset pressure, acquiring a third hydraulic volume and a third moment of the servo cylinder; obtaining a second brake fluid leakage amount based on the second hydraulic volume, the third hydraulic volume, the second moment, the third moment, and the system hysteresis fluid requirement, wherein the system hysteresis fluid requirement is used to characterize the difference in the volume of brake fluid delivered by the servo cylinder under pressurization and depressurization conditions when the pressure of the servo cylinder reaches the preset pressure; and obtaining a third brake fluid leakage amount based on the first brake fluid leakage amount and the second brake fluid leakage amount.

[0009] Optionally, the step of obtaining the second brake fluid leakage amount based on the second hydraulic volume, the third hydraulic volume, the second time, the third time, and the system hysteresis fluid requirement includes calculation using the following formula: q2=(V4-V3-V0) / (T3-T2); where q2 is the second brake fluid leakage amount, V4 is the third hydraulic volume, T3 is the third time, V3 is the second hydraulic volume, T2 is the second time, and V0 is the system hysteresis fluid requirement.

[0010] Optionally, obtaining the third brake fluid leakage amount based on the first brake fluid leakage amount and the second brake fluid leakage amount includes: selecting the maximum value between the first brake fluid leakage amount and the second brake fluid leakage amount as the third brake fluid leakage amount.

[0011] Optionally, obtaining the first brake fluid leakage amount based on the actual hydraulic volume and the first hydraulic volume includes calculating the first brake fluid leakage amount using the following formula: q1 = d(V2 - V1) / dt; where q1 is the first brake fluid leakage amount, V2 is the first hydraulic volume, V1 is the actual hydraulic volume, and d(V2 - V1) / dt is the discrete data derivative of the difference between the first hydraulic volume and the actual hydraulic volume.

[0012] Optionally, the vehicle has a brake pedal and an automatic cruise control system, and the detection method further includes: determining that the integrated braking control system is in a pressurization process when the brake pedal is depressed or the automatic cruise control system actively increases the pressure on the integrated braking control system; determining that the integrated braking control system is in a depressurization process when the brake pedal is released or the automatic cruise control system actively depressurizes the pressure on the integrated braking control system.

[0013] Optionally, the detection method further includes: obtaining a first leakage time during the leakage process of the first brake fluid leakage amount; obtaining a leakage coefficient based on the first brake fluid leakage amount and a first standard table, wherein the first standard table is used to characterize the relationship between the first brake fluid leakage amount and the leakage coefficient; determining a time coefficient based on the first leakage time and a second standard table, wherein the second standard table is used to characterize the relationship between the first leakage time and the time coefficient; and calculating the product of the leakage coefficient and the time coefficient to obtain a leakage severity coefficient.

[0014] Optionally, obtaining the first leakage time used during the leakage process of the first brake fluid leakage amount includes: obtaining the first leakage time used during the leakage process of the first brake fluid leakage amount when the first brake fluid leakage amount is greater than a first preset value.

[0015] Optionally, the detection method further includes: when the leakage severity coefficient is greater than or equal to a second preset value, controlling the vehicle's instrument panel or central control screen to issue a reminder to the driver.

[0016] Optionally, the vehicle includes an anti-lock braking system (ABS), and obtaining the first hydraulic volume of the servo cylinder and the actual stroke of the push rod includes: obtaining the first operating state of the ABS; when the first operating state is inactive, obtaining the first hydraulic volume of the servo cylinder and the actual stroke of the push rod.

[0017] Optionally, obtaining the first hydraulic volume of the servo cylinder and the actual stroke of the push rod includes: obtaining the validity information of the signal received by the integrated braking control system; when the validity information is true, obtaining the first hydraulic volume of the servo cylinder and the actual stroke of the push rod.

[0018] Optionally, obtaining the first hydraulic volume of the servo cylinder and the actual stroke of the push rod includes: obtaining the second operating state of the high-pressure system of the vehicle; when the second operating state is in a high-pressure state, obtaining the first hydraulic volume of the servo cylinder and the actual stroke of the push rod.

[0019] A second aspect of the present invention provides a brake fluid leakage detection system applied to a vehicle having an integrated brake control system, the integrated brake control system having a servo cylinder, the servo cylinder including a push rod for pushing brake fluid, the detection system comprising: an acquisition module for: acquiring a first actual pressure of the servo cylinder and an actual stroke of the push rod; an analysis module for: calculating a first hydraulic volume of the servo cylinder based on the first actual pressure; obtaining the actual hydraulic volume of the servo cylinder based on the actual stroke and a parameter relationship curve, wherein the parameter relationship curve is used to characterize the relationship between the push rod stroke and the servo cylinder volume; and a calculation module for: obtaining a first brake fluid leakage amount based on the actual hydraulic volume and the first hydraulic volume.

[0020] A third aspect of the present invention provides a vehicle including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform any of the above-described brake fluid leakage detection methods.

[0021] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program, wherein the computer program is configured to execute any of the above-described brake fluid leakage detection methods when run on a computer or processor. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 This is a flowchart of the brake fluid leakage detection method according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the specific process of the brake fluid leakage detection method according to an embodiment of the present invention;

[0025] Figure 3 This is a flowchart of the brake fluid leakage detection method according to an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the hydraulic circuit of an integrated brake control system that can be used in the brake fluid leakage detection method of this invention embodiment;

[0027] Figure 5 This is a structural block diagram of the brake fluid leakage detection system according to an embodiment of the present invention.

[0028] 81. Servo cylinder; 82. Brake wheel cylinder; 83. Brake pedal. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] According to an embodiment of the present invention, an embodiment of a brake fluid leakage detection method is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system containing at least one set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0032] This method embodiment can also be executed in an electronic system / device containing a memory and a processor, a similar control system, or in the cloud. Taking an electronic system / device as an example, the electronic system / device may include one or more processors and a memory for storing data. Optionally, the aforementioned electronic system / device may also include communication devices for communication functions and display devices. Those skilled in the art will understand that the above structural description is merely illustrative and does not limit the structure of the aforementioned electronic system / device. For example, the electronic system / device may also include more or fewer components than those described above, or have a different configuration than those described above.

[0033] A processor may include one or more processing units. For example, a processor may include a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processing (DSP) chip, a microcontroller unit (MCU), a field-programmable gate array (FPGA), a neural network processing unit (NPU), a tensor processing unit (TPU), or an artificial intelligence (AI) processor, etc. Different processing units may be independent components or integrated into one or more processors. In some instances, an electronic system may also include one or more processors.

[0034] The memory can be used to store computer programs, such as the computer program corresponding to the vehicle control method in this embodiment of the invention. The processor implements the vehicle control method by running the computer program stored in the memory. The memory may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include memory remotely located relative to the processor, which can be connected to the electronic system via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0035] like Figure 1-4 As shown, a brake fluid leakage detection method is applied to vehicles with integrated brake control systems, such as... Figure 4 As shown, the integrated braking control system includes a servo cylinder 81, which contains a push rod. The movement of the push rod in the servo cylinder 81 pushes the brake fluid, which is then delivered to each brake wheel cylinder 82 through pipelines to achieve braking.

[0036] The detection method includes the following steps:

[0037] Step S100: Obtain the first actual pressure of the servo cylinder 81 and the actual stroke of the push rod.

[0038] Specifically, the servo cylinder 81 is equipped with a pressure sensor, which can measure the initial actual pressure inside the servo cylinder 81 in real time. Simultaneously, the push rod is equipped with a position sensor, which can measure the actual stroke of the push rod in real time.

[0039] Step S200: Calculate the first hydraulic volume of the servo cylinder 81 based on the first actual pressure.

[0040] Specifically, the volume of brake fluid within the servo cylinder 81 is related to the brake fluid pressure, or braking force, of the wheel cylinder at the other end of the pipeline. Since the pressure within the servo cylinder 81 is correlated with the brake fluid pressure, there is a direct correlation between the pressure and volume within the servo cylinder 81. That is, the first hydraulic volume of the servo cylinder 81 can be calculated from the first actual pressure within it. In essence, the first hydraulic volume represents the theoretical volume value within the servo cylinder 81 under a given braking force.

[0041] Step S300: The actual hydraulic volume of the servo cylinder 81 is obtained based on the actual stroke and parameter relationship curve, wherein the parameter relationship curve is used to characterize the relationship between the push rod stroke and the volume of the servo cylinder 81.

[0042] Specifically, based on the structural characteristics of the servo cylinder 81, the actual stroke of the push rod is related to its position. The position of the push rod has an absolute correspondence with the volume within the servo cylinder 81, i.e., the actual hydraulic volume. A parameter relationship curve can be obtained through preliminary vehicle experiments. This curve characterizes the relationship between the push rod stroke and the volume of the servo cylinder 81. Therefore, the actual stroke can be substituted into the parameter relationship curve to obtain the actual hydraulic volume of the servo cylinder 81. It can be understood that the actual hydraulic volume is the volume of brake fluid that the servo cylinder 81 can hold.

[0043] Step S400: Obtain the current first brake fluid leakage amount based on the actual hydraulic volume and the first hydraulic volume.

[0044] Specifically, assuming no leakage in the integrated braking control system, during the actual stroke of the push rod, the actual hydraulic volume in the servo cylinder 81 forms a standard pressure within the servo cylinder 81. This standard pressure should be the same as the first actual pressure, and the first hydraulic volume calculated based on the first actual pressure should be the same as the actual hydraulic volume. However, when a leakage occurs in the integrated braking control system, the first actual pressure will be less than the standard pressure, thus failing to provide the required braking force. The first hydraulic volume calculated based on the first actual pressure will then be smaller than the actual hydraulic volume.

[0045] Specifically, the first brake fluid leakage amount can be calculated using the following formula: q1=d(V2-V1) / dt; where q1 is the first brake fluid leakage amount, V2 is the first hydraulic volume, V1 is the actual hydraulic volume, and d(V2-V1) / dt is the discrete derivative of the difference between the first hydraulic volume and the actual hydraulic volume.

[0046] The first brake fluid leakage amount, calculated based on the actual hydraulic volume of the servo cylinder 81 and the first hydraulic volume reflecting the pressure inside the servo cylinder 81, can more accurately characterize the degree of brake force reduction, which is beneficial to linking the first brake fluid leakage amount to the vehicle braking safety.

[0047] The brake fluid leakage detection method of the present invention can obtain a first brake fluid leakage amount that can accurately characterize the leakage situation, thereby facilitating the understanding of the vehicle's safety status based on the first brake fluid leakage amount.

[0048] Optionally, in step S200, calculating the first hydraulic volume based on the first actual pressure further includes step S210: obtaining the braking movement speed of the push rod; and calculating the first hydraulic volume based on the first actual pressure and the braking movement speed.

[0049] Specifically, it can be understood that during the braking process, the brake fluid in the servo cylinder 81 is in a flowing state. Based on the influence of the braking movement speed on the first actual pressure, the first hydraulic volume of the servo cylinder 81 under the first actual pressure can be calculated more accurately, thereby improving the accuracy of the first brake fluid leakage.

[0050] Optionally, the detection method further includes step S500: when the integrated brake control system pressurizes, the second actual pressure of the servo cylinder 81 is obtained; when the second actual pressure increases to reach a preset pressure, the second hydraulic volume and second moment of the servo cylinder 81 are obtained; when the integrated brake control system depressurizes, the third actual pressure of the servo cylinder 81 is obtained; when the third actual pressure decreases to reach a preset pressure, the third hydraulic volume and third moment of the servo cylinder 81 are obtained; the second brake fluid leakage amount is obtained based on the second hydraulic volume, the third hydraulic volume, the second moment, the third moment, and the system hysteresis fluid requirement, wherein the system hysteresis fluid requirement is used to characterize the difference in the volume of brake fluid delivered by the servo cylinder 81 under pressurization and depressurization conditions when the pressure of the servo cylinder 81 reaches the preset pressure; the third brake fluid leakage amount is obtained based on the first brake fluid leakage amount and the second brake fluid leakage amount.

[0051] Specifically, the vehicle has a brake pedal 83 and an automatic cruise control system. When the brake pedal 83 is pressed, it causes the push rod inside the servo cylinder 81 to move, thereby pushing the brake fluid and delivering it through the pipeline to each brake wheel cylinder 82 to achieve braking. The automatic cruise control system can maintain the vehicle at a preset speed and can also provide a certain braking capability through control of the integrated brake control system.

[0052] When the brake pedal 83 is depressed or the cruise control system actively increases pressure on the integrated braking control system, it is determined that the integrated braking control system is in a pressurization process; when the brake pedal 83 is released or the cruise control system actively decreases pressure on the integrated braking control system, it is determined that the integrated braking control system is in a depressurization process. It can be understood that when the integrated braking control system is in a pressurization state, i.e., the brake pedal 83 is depressed or the cruise control system actively increases pressure on the integrated automatic control system, the pressure in the servo cylinder 81 rises, and the second actual pressure rises and changes with the depth of the driver's depressing of the brake pedal 83 or the degree of control by the cruise control system. The pressure in the servo cylinder 81, i.e., the second actual pressure, is acquired and monitored in real time. When the second actual pressure reaches the preset pressure, the volume of the servo cylinder 81 at this time is acquired as the second hydraulic volume, and the time at this moment is acquired as the second moment.

[0053] When braking ends, the driver releases the brake pedal 83 or the automatic cruise control system initiates active decompression. At this time, the integrated braking control system is in decompression state, causing the pressure in the servo cylinder 81 to drop. The pressure inside the servo cylinder 81 is acquired and monitored in real time, i.e., the third actual pressure. When the third actual pressure reaches the aforementioned preset pressure, the volume of the servo cylinder 81 at this time is acquired as the third liquid volume, and the time at this moment is acquired as the third moment.

[0054] The pressure within the servo cylinder 81 can be obtained by monitoring the brake fluid pressure using a pressure sensor integrated within the servo cylinder 81. The second and third hydraulic volumes within the servo cylinder 81 can be calculated by measuring the displacement of the push rod using a motor angle sensor integrated within the servo cylinder 81.

[0055] During the process of transmitting brake fluid in the boost and depressurization conditions, some brake fluid may remain in the pipes or brake components. Through vehicle testing during the vehicle development phase, the pressure of the servo cylinder 81 is measured. When the pressure reaches the preset pressure in the boost and depressurization conditions, the difference between the brake fluid output volume of the servo cylinder 81 in the depressurization condition and the brake fluid output volume of the servo cylinder 81 in the boost condition is the system hysteresis fluid requirement.

[0056] The second brake fluid leakage rate can be obtained using the following formula:

[0057] q2 = (V4 - V3 - V0) / (T3 - T2);

[0058] Where q2 is the second brake fluid leakage, V4 is the third hydraulic volume, T3 is the third time point, V3 is the second hydraulic volume, T2 is the second time point, and V0 is the system hysteresis fluid requirement.

[0059] Specifically, when there is no leakage in the integrated brake control system, the difference between the third and second hydraulic volumes is the same as the system's hysteresis fluid requirement, and the second brake fluid leakage is zero. However, when a leakage occurs in the integrated brake control system, there is a difference between the third and second hydraulic volumes. The value calculated by the numerator of the above formula represents the brake fluid leakage volume, thereby calculating the second brake fluid leakage.

[0060] Optionally, in step S500, the process of obtaining the third brake fluid leakage amount based on the first brake fluid leakage amount and the second brake fluid leakage amount further includes step S510: selecting the maximum value between the first brake fluid leakage amount and the second brake fluid leakage amount as the third brake fluid leakage amount.

[0061] It should be noted that steps S100-S400 and step S500 can be run synchronously. The first brake fluid leakage amount and the second brake fluid leakage amount can be obtained at the same time. By comparing and analyzing the values, the larger value between the two is selected as the third brake fluid leakage amount. By analyzing the third brake fluid leakage amount, the safety of the braking system can be judged, thereby maximizing the protection of the vehicle's braking function and improving the vehicle's safety and reliability.

[0062] Optionally, the detection method further includes step S600: obtaining the first leakage time during the leakage process of the first brake fluid leakage amount; obtaining a leakage coefficient based on the first brake fluid leakage amount and a first standard table, wherein the first standard table is used to characterize the relationship between the first brake fluid leakage amount and the leakage coefficient; determining a time coefficient based on the first leakage time and a second standard table, wherein the second standard table is used to characterize the relationship between the first leakage time and the time coefficient; and calculating the product of the leakage coefficient and the time coefficient to obtain a leakage severity coefficient.

[0063] Specifically, the first and second standard tables are parameter relationships calibrated based on whether the driver's demand for brake pedal 83 or the active pressure boosting demand of the integrated brake control system is met. The first standard table characterizes the relationship between the first brake fluid leakage amount and the leakage coefficient, while the second standard table characterizes the relationship between the first leakage event and the time coefficient. Both the leakage coefficient and the time coefficient range from [0-1]. Multiplying the leakage coefficient by the time coefficient yields the leakage severity coefficient, which balances the first brake fluid leakage amount and the first leakage time. Using the leakage severity coefficient to analyze the impact of brake fluid leakage within the integrated brake control system on vehicle braking safety allows for a more accurate assessment of leakage severity based on actual braking demand variations. Furthermore, this method does not require active driver intervention, ensuring safety without the driver's knowledge.

[0064] Optionally, in step S600, obtaining the first leakage time during the leakage process of the first brake fluid leakage amount further includes: when the first brake fluid leakage amount is greater than a first preset value, obtaining the first leakage time during the leakage process of the first brake fluid leakage amount. During the operation of the integrated brake control system, the pressure, volume, and other parameters of the brake fluid may vary within a certain range due to the influence of the external environment, such as temperature. Even when there is no leakage in the integrated brake control system, significant environmental changes may cause the calculated first brake fluid leakage amount to be greater than zero. Therefore, multiple experiments can be conducted to understand the impact of environmental changes on the detection method, and considering the safety impact of brake fluid leakage on the vehicle, a threshold range for leakage error judgment, namely the first preset value, can be given to the calculated first brake fluid leakage amount. When the first brake fluid leakage amount is less than or equal to the first preset value, it is considered that the current first brake fluid leakage amount does not clearly represent a leakage in the integrated brake control system or that the leakage amount is extremely small and does not affect the braking safety of the vehicle, and therefore, it is not necessary to calculate the leakage severity coefficient. In addition, in integrated brake control systems, there may be sensor detection errors or deviations, which may also cause small values ​​and variations in the first brake fluid leakage. Therefore, the above methods can also be used to eliminate these issues.

[0065] Optionally, in step S600, the detection method further includes: when the leakage severity coefficient is greater than or equal to a second preset value, controlling the vehicle's instrument panel or central control screen to issue a reminder to the driver. This can ensure vehicle driving safety and improve the driving experience.

[0066] In other embodiments, the second brake fluid leakage amount obtained in step S500 can also be used to calculate the second severity coefficient using the calculation principle in step S600, that is, to calculate the total leakage time used in the leakage process based on the second time and the third time; to obtain the first coefficient based on the second brake fluid leakage amount and the third standard table, wherein the third standard table is used to characterize the relationship between the second brake fluid leakage amount and the first coefficient; to determine the second coefficient based on the total leakage time and the fourth standard table, wherein the fourth standard table is used to characterize the relationship between the total leakage time and the second coefficient; to calculate the product of the first coefficient and the second coefficient to obtain the second severity coefficient, and to select the maximum value between the leakage severity coefficient and the second severity coefficient as the third severity coefficient.

[0067] Specifically, the third and fourth standard tables are parameter relationships obtained through calibration based on whether the driver's demand for brake pedal 83 or the active pressure boosting demand of the integrated brake control system is met. The first and second coefficients both range from [0-1]. Multiplying the first and second coefficients yields the second severity coefficient, which balances the second brake fluid leakage amount and the total leakage time. The maximum value between the leakage severity coefficient and the second severity coefficient is used as the evaluation or analysis parameter for vehicle braking safety; that is, the third severity coefficient is used as the final leakage error rate. This not only allows for the assessment of leakage severity in accordance with actual braking demand variations but also maximizes vehicle safety and reliability.

[0068] Optionally, in step S100, the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod are obtained, including step S101. Step S101 includes one, two, or three of the following steps: S102, S103, and S104.

[0069] Step S102: Obtain the first operating state of the anti-lock braking system (ABS); when the first operating state is inactive, obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod. It should be noted that the vehicle has an anti-lock braking system (ABS). When the first operating state of the ABS is active, the pressure relief valve frequently opens and closes, leading to unreasonable calculation results and potentially misjudging the leakage amount and degree of the integrated braking control system. Therefore, obtaining the current first pressure relief volume and the actual stroke parameters of the push rod for calculation when the first operating state of the ABS is inactive ensures the accuracy of the calculation results.

[0070] Step S103: Obtain the validity information of the signals received by the integrated braking control system; when the validity information is true, obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod. Valid signals received by the integrated braking control system, such as the pedal stroke validity signal in the internal signal, need to be verified. If the verification fails, the human signal is considered unreliable.

[0071] Step S104: Obtain the second operating state of the vehicle's high-pressure system; when the second operating state is under high pressure, obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod. The servo cylinder 81 will only operate when the second operating state is under high pressure.

[0072] It is understandable that step S101 involves: acquiring the first operating state of the anti-lock braking system; acquiring the validity information of the signals received by the integrated braking control system; acquiring the second operating state of the vehicle's high-pressure system; and acquiring the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod when the first operating state is inactive, the validity information is true, and the second operating state is under high pressure. When the leakage detection conditions in step S101—the first operating state being inactive, the validity information being true, and the second operating state being under high pressure—are all met, the leakage detection method is activated to perform leakage detection.

[0073] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0074] This embodiment also provides a brake fluid leakage detection system, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" refers to a combination of software and / or hardware capable of performing a predetermined function. Although the systems described in the following embodiments are preferably implemented in software, hardware implementations, or combinations of software and hardware, are also possible and contemplated.

[0075] like Figure 5 As shown, a brake fluid leak detection system includes:

[0076] The acquisition module 701 is used to perform the above step S100: acquire the first actual pressure of the servo cylinder 81 and the actual stroke of the push rod;

[0077] Analysis module 702 is used to perform the above steps S200 and S300: calculate the first hydraulic volume of servo cylinder 81 based on the first actual pressure; obtain the actual hydraulic volume of servo cylinder 81 based on the actual stroke and parameter relationship curve, wherein the parameter relationship curve is used to characterize the relationship between the push rod stroke and the volume of servo cylinder 81.

[0078] The calculation module 703 is used to perform the above step S400: to obtain the current first brake fluid leakage amount based on the actual hydraulic volume and the first hydraulic volume.

[0079] Optionally, the analysis module 702 is also used to perform the above step S210: obtain the braking movement speed of the push rod; calculate the first hydraulic volume based on the first actual pressure and the braking movement speed.

[0080] Optionally, the calculation module 703 is also used to perform the above step S500: when the integrated brake control system pressurizes, it obtains the second actual pressure of the servo cylinder 81; when the second actual pressure increases to reach the preset pressure, it obtains the second hydraulic volume and the second moment of the servo cylinder 81; when the integrated brake control system depressurizes, it obtains the third actual pressure of the servo cylinder 81; when the third actual pressure decreases to reach the preset pressure, it obtains the third hydraulic volume and the third moment of the servo cylinder 81; based on the second hydraulic volume, the third hydraulic volume, the second moment, the third moment, and the system hysteresis fluid requirement, it obtains the second brake fluid leakage amount, whereby the system hysteresis fluid requirement is used to characterize the difference in the volume of brake fluid delivered by the servo cylinder 81 under pressurization and depressurization conditions when the pressure of the servo cylinder 81 reaches the preset pressure; based on the first brake fluid leakage amount and the second brake fluid leakage amount, it obtains the third brake fluid leakage amount.

[0081] Optionally, the calculation module 703 is also used to perform the above step S510: select the maximum value between the first brake fluid leakage amount and the second brake fluid leakage amount as the third brake fluid leakage amount.

[0082] Optionally, the calculation module 703 is further configured to perform the above step S600: obtaining the first leakage time taken during the leakage process of the first brake fluid leakage amount; obtaining a leakage coefficient based on the first brake fluid leakage amount and a first standard table, wherein the first standard table is used to characterize the relationship between the first brake fluid leakage amount and the leakage coefficient; determining a time coefficient based on the first leakage time and a second standard table, wherein the second standard table is used to characterize the relationship between the first leakage time and the time coefficient; and calculating the product of the leakage coefficient and the time coefficient to obtain a leakage severity coefficient. In other embodiments, the second brake fluid leakage amount obtained in step S500 can also be used to calculate the second severity coefficient using the calculation principle in step S600, that is, calculating the total leakage time taken during the leakage process based on the second and third moments; obtaining a first coefficient based on the second brake fluid leakage amount and a third standard table, wherein the third standard table is used to characterize the relationship between the second brake fluid leakage amount and the first coefficient; determining a second coefficient based on the total leakage time and a fourth standard table, wherein the fourth standard table is used to characterize the relationship between the total leakage time and the second coefficient; calculating the product of the first coefficient and the second coefficient to obtain a second severity coefficient; and selecting the maximum value between the leakage severity coefficient and the second severity coefficient as the third severity coefficient.

[0083] Optionally, the calculation module 703 is also used to perform the following: when the first brake fluid leakage amount is greater than a first preset value, obtain the first leakage time taken during the leakage process. The detection method also includes: when the leakage severity coefficient is greater than or equal to a second preset value, controlling the vehicle's instrument panel or central control screen to issue a reminder to the driver. This can ensure vehicle driving safety and improve the driving experience.

[0084] Optionally, the calculation module 703 is also used to perform step S102: obtain the first operating state of the anti-lock braking system; when the first operating state is inactive, obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0085] Optionally, the calculation module 703 is also used to perform step S103: obtain the validity information of the signal received by the integrated braking control system; when the validity information is true, obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0086] Optionally, the calculation module 703 is also used to perform step S104: obtain the second operating state of the vehicle's high-pressure system; when the second operating state is in a high-pressure state, obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0087] Optionally, the calculation module 703 is also used to perform step S101: obtain the first operating state of the anti-lock braking system; obtain the validity information of the signal received by the integrated braking control system; obtain the second operating state of the vehicle's high-pressure system; and obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod when the first operating state is inactive, when the validity information is true, and when the second operating state is under high pressure.

[0088] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.

[0089] Embodiments of the present invention also provide a vehicle including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform a brake fluid leakage detection method as described in any of the above embodiments.

[0090] Optionally, in this embodiment, the processor in the vehicle can be configured to run a computer program to execute the steps of the control method in the foregoing embodiments:

[0091] Step S100: Obtain the first actual pressure of the servo cylinder 81 and the actual stroke of the push rod;

[0092] Step S200: Calculate the first hydraulic volume of the servo cylinder 81 based on the first actual pressure;

[0093] Step S300: Obtain the actual hydraulic volume of the servo cylinder 81 based on the actual stroke and parameter relationship curve, wherein the parameter relationship curve is used to characterize the relationship between the push rod stroke and the volume of the servo cylinder 81.

[0094] Step S400: Obtain the current first brake fluid leakage amount based on the actual hydraulic volume and the first hydraulic volume.

[0095] Step S210: Obtain the braking movement speed of the push rod; calculate the first hydraulic volume based on the first actual pressure and the braking movement speed.

[0096] Step S500: When the integrated brake control system pressurizes, the second actual pressure of the servo cylinder 81 is obtained; when the second actual pressure increases to reach the preset pressure, the second hydraulic volume and the second moment of the servo cylinder 81 are obtained; when the integrated brake control system depressurizes, the third actual pressure of the servo cylinder 81 is obtained; when the third actual pressure decreases to reach the preset pressure, the third hydraulic volume and the third moment of the servo cylinder 81 are obtained; the second brake fluid leakage amount is obtained based on the second hydraulic volume, the third hydraulic volume, the second moment, the third moment, and the system hysteresis fluid requirement. The system hysteresis fluid requirement is used to characterize the difference in the volume of brake fluid delivered by the servo cylinder 81 under pressurization and depressurization conditions when the pressure of the servo cylinder 81 reaches the preset pressure; the third brake fluid leakage amount is obtained based on the first brake fluid leakage amount and the second brake fluid leakage amount.

[0097] Step S510: Select the maximum value between the first brake fluid leakage amount and the second brake fluid leakage amount as the third brake fluid leakage amount.

[0098] Step S600: Obtain the first leakage time during the leakage process of the first brake fluid leakage amount; obtain the leakage coefficient based on the first brake fluid leakage amount and the first standard table, wherein the first standard table is used to characterize the relationship between the first brake fluid leakage amount and the leakage coefficient; determine the time coefficient based on the first leakage time and the second standard table, wherein the second standard table is used to characterize the relationship between the first leakage time and the time coefficient; calculate the product of the leakage coefficient and the time coefficient to obtain the leakage severity coefficient.

[0099] In other embodiments, the second brake fluid leakage amount obtained in step S500 can also be used to calculate the second severity coefficient using the calculation principle in step S600, that is, to calculate the total leakage time used in the leakage process based on the second time and the third time; to obtain the first coefficient based on the second brake fluid leakage amount and the third standard table, wherein the third standard table is used to characterize the relationship between the second brake fluid leakage amount and the first coefficient; to determine the second coefficient based on the total leakage time and the fourth standard table, wherein the fourth standard table is used to characterize the relationship between the total leakage time and the second coefficient; to calculate the product of the first coefficient and the second coefficient to obtain the second severity coefficient, and to select the maximum value between the leakage severity coefficient and the second severity coefficient as the third severity coefficient.

[0100] When the first brake fluid leakage exceeds a first preset value, the first leakage time during the leakage process is obtained. The detection method also includes: when the leakage severity coefficient is greater than or equal to a second preset value, the vehicle's instrument panel or central control screen issues a warning to the driver. This ensures vehicle driving safety and improves the driving experience.

[0101] Step S102: Obtain the first operating state of the anti-lock braking system; when the first operating state is inactive, obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0102] Step S103: Obtain the validity information of the signal received by the integrated braking control system; when the validity information is true, obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0103] Step S104: Obtain the second operating state of the vehicle's high-pressure system; when the second operating state is in a high-pressure state, obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0104] Step S101: Obtain the first operating state of the anti-lock braking system; obtain the validity information of the signal received by the integrated braking control system; obtain the second operating state of the vehicle's high-pressure system; when the first operating state is inactive and the validity information is true and the second operating state is under high pressure, obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0105] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.

[0106] Embodiments of the present invention also provide a computer-readable storage medium storing a computer program, wherein the computer program is configured to execute a brake fluid leakage detection method described in any of the above embodiments when run on a computer or processor.

[0107] Optionally, in this embodiment, the computer program described above may be configured to store a computer program for performing the control method steps in the foregoing embodiments:

[0108] Step S100: Obtain the first actual pressure of the servo cylinder 81 and the actual stroke of the push rod;

[0109] Step S200: Calculate the first hydraulic volume of the servo cylinder 81 based on the first actual pressure;

[0110] Step S300: Obtain the actual hydraulic volume of the servo cylinder 81 based on the actual stroke and parameter relationship curve, wherein the parameter relationship curve is used to characterize the relationship between the push rod stroke and the volume of the servo cylinder 81.

[0111] Step S400: Obtain the current first brake fluid leakage amount based on the actual hydraulic volume and the first hydraulic volume.

[0112] Step S210: Obtain the braking movement speed of the push rod; calculate the first hydraulic volume based on the first actual pressure and the braking movement speed.

[0113] Step S500: When the integrated brake control system pressurizes, the second actual pressure of the servo cylinder 81 is obtained; when the second actual pressure increases to reach the preset pressure, the second hydraulic volume and the second moment of the servo cylinder 81 are obtained; when the integrated brake control system depressurizes, the third actual pressure of the servo cylinder 81 is obtained; when the third actual pressure decreases to reach the preset pressure, the third hydraulic volume and the third moment of the servo cylinder 81 are obtained; the second brake fluid leakage amount is obtained based on the second hydraulic volume, the third hydraulic volume, the second moment, the third moment, and the system hysteresis fluid requirement. The system hysteresis fluid requirement is used to characterize the difference in the volume of brake fluid delivered by the servo cylinder 81 under pressurization and depressurization conditions when the pressure of the servo cylinder 81 reaches the preset pressure; the third brake fluid leakage amount is obtained based on the first brake fluid leakage amount and the second brake fluid leakage amount.

[0114] Step S510: Select the maximum value between the first brake fluid leakage amount and the second brake fluid leakage amount as the third brake fluid leakage amount.

[0115] Step S600: Obtain the first leakage time during the leakage process of the first brake fluid leakage amount; obtain the leakage coefficient based on the first brake fluid leakage amount and the first standard table, wherein the first standard table is used to characterize the relationship between the first brake fluid leakage amount and the leakage coefficient; determine the time coefficient based on the first leakage time and the second standard table, wherein the second standard table is used to characterize the relationship between the first leakage time and the time coefficient; calculate the product of the leakage coefficient and the time coefficient to obtain the leakage severity coefficient.

[0116] In other embodiments, the second brake fluid leakage amount obtained in step S500 can also be used to calculate the second severity coefficient using the calculation principle in step S600, that is, to calculate the total leakage time used in the leakage process based on the second time and the third time; to obtain the first coefficient based on the second brake fluid leakage amount and the third standard table, wherein the third standard table is used to characterize the relationship between the second brake fluid leakage amount and the first coefficient; to determine the second coefficient based on the total leakage time and the fourth standard table, wherein the fourth standard table is used to characterize the relationship between the total leakage time and the second coefficient; to calculate the product of the first coefficient and the second coefficient to obtain the second severity coefficient, and to select the maximum value between the leakage severity coefficient and the second severity coefficient as the third severity coefficient.

[0117] When the first brake fluid leakage exceeds a first preset value, the first leakage time during the leakage process is obtained. The detection method also includes: when the leakage severity coefficient is greater than or equal to a second preset value, the vehicle's instrument panel or central control screen issues a warning to the driver. This ensures vehicle driving safety and improves the driving experience.

[0118] Step S102: Obtain the first operating state of the anti-lock braking system; when the first operating state is inactive, obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0119] Step S103: Obtain the validity information of the signal received by the integrated braking control system; when the validity information is true, obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0120] Step S104: Obtain the second operating state of the vehicle's high-pressure system; when the second operating state is in a high-pressure state, obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0121] Step S101: Obtain the first operating state of the anti-lock braking system; obtain the validity information of the signal received by the integrated braking control system; obtain the second operating state of the vehicle's high-pressure system; when the first operating state is inactive and the validity information is true and the second operating state is under high pressure, obtain the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0122] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.

[0123] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0124] In some embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The system embodiments described above are merely illustrative; for example, the division of modules can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between modules may be electrical or other forms.

[0125] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0126] Furthermore, the functional modules in the various embodiments of the present invention can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0127] If the integrated module is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0128] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A brake fluid leakage detection method, characterized in that: Applied to a vehicle having an integrated brake control system, the integrated brake control system having a servo cylinder, the servo cylinder including a push rod for pushing brake fluid, the detection method comprising: Acquiring a first actual pressure of the servo cylinder and an actual stroke of the push rod; calculating a first hydraulic volume of the servo cylinder according to the first actual pressure; Obtaining the actual hydraulic volume of the servo cylinder according to the actual stroke and the parameter relationship curve, wherein the parameter relationship curve is used to characterize the relationship between the push rod stroke and the servo cylinder volume; A current first brake fluid leakage amount is obtained according to the actual hydraulic volume and the first hydraulic volume.

2. A brake fluid leakage detection method according to claim 1, characterized in that: The calculating the first hydraulic volume according to the first actual pressure comprises: Obtaining the braking movement speed of the push rod; The first hydraulic volume is calculated based on the first actual pressure and the brake movement speed.

3. A brake fluid leakage detection method according to claim 1, characterized in that: The detection method further comprises: When the integrated brake control system is pressurized, obtaining a second actual pressure of the servo cylinder; When the second actual pressure increases to reach a preset pressure, obtaining a second hydraulic volume and a second moment of the servo cylinder; When the integrated brake control system is depressurized, obtaining a third actual pressure of the servo cylinder; When the third actual pressure decreases to reach the preset pressure, obtaining a third hydraulic volume and a third moment of the servo cylinder; obtaining a second brake fluid leakage amount according to the second hydraulic volume, the third hydraulic volume, the second moment, the third moment, and a system hysteresis fluid requirement, wherein the system hysteresis fluid requirement is used to characterize a difference in volume of brake fluid delivered by the servo cylinder under a pressurization condition and a depressurization condition when the pressure of the servo cylinder reaches the preset pressure; A third brake fluid leakage amount is obtained according to the first brake fluid leakage amount and the second brake fluid leakage amount.

4. A brake fluid leakage detection method according to claim 3, characterized in that: The second brake fluid leakage amount is obtained according to the second hydraulic volume, the third hydraulic volume, the second moment, the third moment, and the system hysteresis fluid requirement, including calculation by the following formula: q2 = (V4 - V3 - V0) / (T3 - T2); Among them, q2 is the second brake fluid leakage, V4 is the third hydraulic volume, T3 is the third moment, V3 is the second hydraulic volume, T2 is the second moment, and V0 is the system hysteresis required fluid volume.

5. A brake fluid leakage detection method according to claim 3, characterized in that: The obtaining a third brake fluid leakage amount according to the first brake fluid leakage amount and the second brake fluid leakage amount includes: A maximum value between the first brake fluid leakage amount and the second brake fluid leakage amount is selected as the third brake fluid leakage amount.

6. A brake fluid leakage detection method according to claim 1, characterized in that: The obtaining of the first brake fluid leakage amount according to the actual hydraulic volume and the first hydraulic volume comprises calculating the first brake fluid leakage amount by the following formula: q1=d(V2-V1) / dt; Wherein, q1 is the first brake fluid leakage, V2 is the first hydraulic volume, V1 is the actual hydraulic volume, and d(V2-V1) / dt is the discrete data derivation of the difference between the first hydraulic volume and the actual hydraulic volume.

7. A brake fluid leakage detection method according to claim 3, characterized in that: The vehicle has a brake pedal and an automatic cruise system, and the detection method further includes: When the brake pedal is depressed or the automatic cruise system actively pressurizes the integrated brake control system, it is determined that the integrated brake control system is in a pressurization process; When the brake pedal is released or the automatic cruise system actively reduces the pressure on the integrated brake control system, it is determined that the integrated brake control system is in a decompression process.

8. A brake fluid leakage detection method according to claim 1, characterized in that: The detection method further comprises: Obtaining a first leakage time used by the first brake fluid leakage amount during a leakage process; Obtaining a leakage coefficient according to the first brake fluid leakage amount and a first standard table, wherein the first standard table is used to characterize the relationship between the first brake fluid leakage amount and the leakage coefficient; Determining a time coefficient according to the first leakage time and a second standard table, wherein the second standard table is used to characterize the relationship between the first leakage time and the time coefficient; The product of the leakage coefficient and the time coefficient is calculated to obtain a leakage severity coefficient.

9. A brake fluid leakage detection method according to claim 8, characterized in that: The obtaining of a first leakage time used in the leakage process of the first brake fluid leakage amount includes: When the first brake fluid leakage amount is greater than a first preset value, a first leakage time used by the first brake fluid leakage amount in a leakage process is acquired.

10. A brake fluid leakage detection method according to claim 8, characterized in that: The detection method further comprises: When the leakage severity coefficient is greater than or equal to a second preset value, the instrument or central control screen of the vehicle is controlled to issue a reminder to the driver.

11. A brake fluid leakage detection method according to claim 1, characterized in that: The vehicle includes an anti-lock braking system, and the obtaining of the first hydraulic volume of the servo cylinder and the actual stroke of the push rod includes: Acquiring a first operating state of the anti-lock braking system; When the first operating state is an inactive state, a first hydraulic volume of the servo cylinder and an actual stroke of the push rod are acquired.

12. A brake fluid leakage detection method according to claim 1, characterized in that: The obtaining of the first hydraulic volume of the servo cylinder and the actual stroke of the push rod comprises: Acquiring validity information of a signal received by the integrated brake control system; When the validity information is true, the first hydraulic volume of the servo cylinder and the actual stroke of the push rod are acquired.

13. A brake fluid leakage detection method according to claim 1, characterized in that: The obtaining of the first hydraulic volume of the servo cylinder and the actual stroke of the push rod comprises: obtaining a second operating state of a high voltage system of the vehicle; When the second operating state is in a high pressure state, a first hydraulic volume of the servo cylinder and an actual stroke of the push rod are acquired.

14. A brake fluid leakage detection system, characterized in that: Applied to a vehicle having an integrated brake control system, the integrated brake control system having a servo cylinder, the servo cylinder including a push rod for pushing brake fluid, the detection system comprising: An acquisition module, used to: acquire a first actual pressure of the servo cylinder and an actual stroke of the push rod; an analysis module, configured to: calculate a first hydraulic volume of the servo cylinder according to the first actual pressure; and obtain the actual hydraulic volume of the servo cylinder according to the actual stroke and a parameter relationship curve, wherein the parameter relationship curve is used to characterize the relationship between the push rod stroke and the servo cylinder volume; The calculation module is used to obtain a first brake fluid leakage amount according to the actual hydraulic volume and the first hydraulic volume.

15. A vehicle comprising a memory and a processor, characterized in that: The memory stores a computer program, and the processor is configured to run the computer program to execute the brake fluid leakage detection method according to any one of claims 1 to 13 above.

16. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, wherein the computer program is configured to execute a brake fluid leakage detection method as claimed in any one of claims 1 to 13 when running on a computer or a processor.

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