Brake fluid leakage detection method, system, and vehicle

Abstract

The application discloses a brake fluid leakage detection method, system and vehicle, and belongs to the technical field of vehicle braking. The detection method comprises the following steps: acquiring a first actual pressure and an actual stroke; calculating a first hydraulic volume and an actual hydraulic volume; and obtaining a current first brake fluid leakage amount 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, and the position of the push rod can be represented according to the stroke of the push rod at this time in the servo cylinder. Then, a nominal theoretical liquid volume is obtained according to the standard relationship between the push rod stroke and the servo cylinder volume, i.e. a parameter relationship curve. By comparing and analyzing the theoretical liquid volume and the first hydraulic volume, the first brake fluid leakage amount can be calculated. The first brake fluid leakage amount can accurately represent the leakage condition of the integrated brake control system, thereby being beneficial to understanding the safety condition of the vehicle according to the first brake fluid leakage amount.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle braking technology, in particular to a brake fluid leakage detection method, system and vehicle. BACKGROUND

[0002] The integrated electronic hydraulic brake system is one of the important systems to ensure the safety of vehicle driving, which includes an oil can for storing brake fluid, a master cylinder for responding to brake demand, an actuator such as a servo cylinder for driving the wheel cylinder to realize braking, and a hydraulic pipeline for connecting the above-mentioned components. Among them, the actuator such as the servo cylinder is provided with a plurality of valves for controlling the opening and closing of the pipeline. The power of the wheel cylinder to realize braking relies on the pressure of the hydraulic pressure. Once the brake system leaks, the insufficient braking force will affect the safety of vehicle driving.

[0003] At present, the integrated brake control system pre-stores preset pressures corresponding to different depths of the brake pedal being stepped on. When the driver steps on the brake pedal to control the vehicle to brake, the corresponding preset pressure is retrieved according to the depth of the brake pedal being stepped on, the measured pressure of the servo cylinder is measured, and the measured pressure and the preset pressure are compared. If the measured pressure is lower than the preset pressure, it proves that the brake fluid leaks. However, the above leakage detection method cannot accurately calculate the leakage amount of brake fluid. SUMMARY

[0004] The present application aims to provide a brake fluid leakage detection method, system and vehicle to solve one or more technical problems existing in the prior art, at least to provide a beneficial choice or create conditions.

[0005] To solve the above technical problems, the technical solution adopted by the present application provides a brake fluid leakage detection method, which is applied to a vehicle with an integrated brake control system. The integrated brake control system has a servo cylinder, and the servo cylinder includes a push rod for pushing brake fluid. The detection method comprises: obtaining the first actual pressure of the servo cylinder and the actual stroke of the push rod; calculating the 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 represent the relationship between the stroke of the push rod and the volume of the servo cylinder; and obtaining the current first brake fluid leakage amount according to the actual hydraulic volume and the first hydraulic volume.

[0006] The technical scheme has at least the following beneficial effects: according to the first pressure of the servo cylinder, the first hydraulic volume in the servo cylinder is calculated, according to the stroke of the push rod in the servo cylinder at this time, the position of the push rod is represented, and according to the standard relationship between the stroke of the push rod and the volume of the servo cylinder, that is, the parameter relationship curve, the nominal theoretical liquid volume is obtained; by comparing the nominal theoretical liquid volume with the first hydraulic volume, the first brake fluid leakage amount can be calculated, and the first brake fluid leakage amount can accurately represent the leakage of the integrated brake control system, thereby facilitating understanding of the safety of the vehicle according to the first brake fluid leakage amount.

[0007] Optionally, the first hydraulic volume is calculated according to the first actual pressure, including: obtaining the brake moving speed of the push rod; and calculating the first hydraulic volume according to the first actual pressure and the brake moving speed.

[0008] Optionally, the detection method further includes: when the integrated brake control system is pressurized, obtaining a second actual pressure of the servo cylinder; when the second actual pressure increases to a preset pressure, obtaining a second hydraulic volume of the servo cylinder and a second time; when the integrated brake control system is depressurized, obtaining a third actual pressure of the servo cylinder; when the third actual pressure decreases to the preset pressure, obtaining a third hydraulic volume of the servo cylinder and a third time; obtaining a second brake fluid leakage amount according to the second hydraulic volume, the third hydraulic volume, the second time, the third time, and a system hysteresis required liquid amount, the system hysteresis required liquid amount being used to represent the difference between the volumes of brake fluid delivered by the servo cylinder under pressurization and under depressurization when the pressure of the servo cylinder reaches the preset pressure; and obtaining a third brake fluid leakage amount according to the first brake fluid leakage amount and the second brake fluid leakage amount.

[0009] Optionally, the second brake fluid leakage amount is obtained according to the second hydraulic volume, the third hydraulic volume, the second time, the third time, and the system hysteresis required liquid amount, including being calculated by the following formula: q2=(V4-V3-V0) / (T3-T2); wherein 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 required liquid amount.

[0010] Optionally, the third brake fluid leakage amount is obtained according to the first brake fluid leakage amount and the second brake fluid leakage amount, including: selecting the maximum value of the first brake fluid leakage amount and the second brake fluid leakage amount as the third brake fluid leakage amount.

[0011] Optionally, the first brake fluid leakage amount is obtained according to the actual hydraulic volume and the first hydraulic volume, and the first brake fluid leakage amount is calculated by the following formula: q1=d(V2-V1) / dt; wherein 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 a derivative of discrete data 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 system, and the detection method further comprises: determining that the integrated brake control system is in a pressurization process when the brake pedal is depressed or the automatic cruise system actively pressurizes the integrated brake control system; and determining that the integrated brake control system is in a depressurization process when the brake pedal is released or the automatic cruise system actively depressurizes the integrated brake control system.

[0013] Optionally, the detection method further comprises: obtaining a first leakage time used by the first brake fluid leakage amount in the 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 represent 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 represent the relationship between the first leakage time and the time coefficient; and calculating a product of the leakage coefficient and the time coefficient to obtain a leakage severity coefficient.

[0014] Optionally, the first leakage time used by the first brake fluid leakage amount in the leakage process is obtained when the first brake fluid leakage amount is greater than a first preset value.

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

[0016] Optionally, the vehicle comprises an anti-lock braking system, and the first hydraulic volume of the servo cylinder and the actual stroke of the push rod are obtained by: obtaining a first operating state of the anti-lock braking system; and obtaining the first hydraulic volume of the servo cylinder and the actual stroke of the push rod when the first operating state is an inactive state.

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

[0018] Optionally, the obtaining 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-pressure system of the vehicle; and 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] The second aspect of the present application provides a brake fluid leakage detection system applied to a vehicle with an integrated brake control system, the integrated brake control system having a servo cylinder, the servo cylinder comprising a push rod for pushing brake fluid, the detection system comprising: an obtaining module configured to obtain a first actual pressure of the servo cylinder and an actual stroke of the push rod; an analyzing module configured to calculate a first hydraulic volume of the servo cylinder according to the first actual pressure; and obtain an 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 represent a relationship between the stroke of the push rod and the volume of the servo cylinder; and a calculating module configured to obtain a first brake fluid leakage amount according to the actual hydraulic volume and the first hydraulic volume.

[0020] The third aspect of the present application provides a vehicle comprising a memory and a processor, the memory storing a computer program, and the processor being configured to run the computer program to execute any of the above brake fluid leakage detection methods.

[0021] The fourth aspect of the present application provides a computer-readable storage medium, the storage medium storing a computer program, wherein the computer program is configured to execute any of the above brake fluid leakage detection methods when running on a computer or a processor. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the principles of the present application, and do not limit the present application in any manner. In the drawings:

[0023] Figure 1 A flowchart of the brake fluid leakage detection method of the embodiment of the present application;

[0024] Figure 2 A specific flowchart of the brake fluid leakage detection method of the embodiment of the present application;

[0025] Figure 3 A flowchart of the brake fluid leakage detection method of the embodiment of the present application;

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

[0027] Figure 5 A structure block diagram of a brake fluid leakage detection system according to an embodiment of the present application.

[0028] 81, servo cylinder; 82, brake wheel cylinder; 83, brake pedal. DETAILED DESCRIPTION

[0029] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiment of the present application will be described clearly and completely below in combination with the drawings in the embodiment of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0030] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0031] According to the embodiment of the present application, an embodiment of a brake fluid leakage detection method is provided. It should be noted that the steps shown in the flowchart of the drawings can be executed in a computer system including at least one set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that described herein.

[0032] The method embodiment can also be executed in an electronic system / device, a similar control system or a cloud including a memory and a processor. Taking the electronic system / device as an example, the electronic system / device can include one or more processors and a memory for storing data. Optionally, the above-mentioned electronic system / device can also include a communication device for communication function and a display device. Those skilled in the art can understand that the above-mentioned structure description is only illustrative, which does not limit the structure of the above-mentioned electronic system / device. For example, the electronic system / device can also include more or less components than the above-mentioned structure description, or have a different configuration from the above-mentioned structure description.

[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 Figures 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 provided with a pressure sensor, and the first actual pressure in the servo cylinder 81 can be measured in real time through the pressure sensor. Meanwhile, the push rod is provided with a position sensor, and the actual stroke of the push rod can be measured in real time through the position sensor.

[0039] In step S200, the first hydraulic volume of the servo cylinder 81 is calculated according to the first actual pressure.

[0040] Specifically, the volume of the brake fluid in the servo cylinder 81 has a certain relationship with the brake hydraulic pressure or brake force of the wheel cylinder at the other end of the pipeline, and the pressure in the servo cylinder 81 is related to the brake hydraulic pressure, so the pressure in the servo cylinder 81 has a certain corresponding relationship with the volume in the servo cylinder 81, that is, the first hydraulic volume of the servo cylinder 81 can be calculated through the first actual pressure in the servo cylinder 81. It can be understood that the first hydraulic volume represents the theoretical volume value of the servo cylinder 81 under the determined brake force.

[0041] In step S300, the actual hydraulic volume of the servo cylinder 81 is obtained according to the actual stroke and the parameter relationship curve, wherein the parameter relationship curve is used to represent the relationship between the stroke of the push rod 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 associated with the position of the push rod, and the position of the push rod has an absolute corresponding relationship with the volume in the servo cylinder 81, that is, the actual hydraulic volume. The parameter relationship curve can be obtained through the vehicle early experiment, which represents the relationship between the stroke of the push rod and the volume of the servo cylinder 81, so that 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 the brake fluid that can be contained in the servo cylinder 81.

[0043] In step S400, the current first brake fluid leakage is obtained according to the actual hydraulic volume and the first hydraulic volume.

[0044] Specifically, in the case that the integrated brake control system does not leak, when the push rod is in the actual stroke, the actual hydraulic volume in the servo cylinder 81 forms a standard pressure in the servo cylinder 81, which should be the same as the first actual pressure, and the first hydraulic volume calculated according to the first actual pressure should be the same as the actual hydraulic volume. When the integrated brake control system leaks, the first actual pressure will be less than the standard pressure, so as to be unable to provide the required brake force. The first hydraulic volume calculated according to the first actual pressure will be smaller than the actual hydraulic volume.

[0045] Specifically, the first brake fluid leakage amount can be calculated by the following formula: q1=d(V2-V1) / dt; wherein 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 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 in the servo cylinder 81 can more accurately represent the degree of brake force reduction, which is conducive to associating the safety of vehicle braking with the first brake fluid leakage amount.

[0047] The brake fluid leakage detection method of the present application can obtain the first brake fluid leakage amount that can accurately represent the leakage condition, thereby facilitating understanding of the safety condition of the vehicle according to the first brake fluid leakage amount.

[0048] Optionally, in step S200, the first hydraulic volume is calculated according to the first actual pressure, and the method further comprises step S210: obtaining the brake moving speed of the push rod; and calculating the first hydraulic volume according to the first actual pressure and the brake moving speed.

[0049] Specifically, it can be understood that during braking, the brake fluid in the servo cylinder 81 is in a flowing state, and the first hydraulic volume of the servo cylinder 81 under the first actual pressure can be calculated according to the influence of the brake moving speed on the first actual pressure, thereby improving the accuracy of the first brake fluid leakage amount.

[0050] Optionally, the detection method further comprises step S500: obtaining the second actual pressure of the servo cylinder 81 when the integrated brake control system is pressurized; obtaining the second hydraulic volume of the servo cylinder 81 and the second time when the second actual pressure increases to reach a preset pressure; obtaining the third actual pressure of the servo cylinder 81 when the integrated brake control system is depressurized; obtaining the third hydraulic volume of the servo cylinder 81 and the third time when the third actual pressure decreases to reach the preset pressure; obtaining the second brake fluid leakage amount according to the second hydraulic volume, the third hydraulic volume, the second time, the third time, and the system hysteresis required fluid amount, wherein the system hysteresis required fluid amount is used to represent the difference between the volumes of brake fluid delivered by the servo cylinder 81 under pressurized working conditions and under depressurized working conditions when the pressure of the servo cylinder 81 reaches the preset pressure; and obtaining the third brake fluid leakage amount according to 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 system. When the brake pedal 83 is depressed, the push rod in the servo cylinder 81 is moved to push the brake fluid, so that the brake fluid is delivered to each brake wheel cylinder 82 through the pipeline to achieve braking. The automatic cruise system can keep the vehicle traveling at a preset speed and has a certain braking capacity by controlling the integrated brake control system.

[0052] When the brake pedal 83 is depressed or the integrated brake control system is actively pressurized by the automatic cruise system, it is determined that the integrated brake control system is in the pressurization process; when the brake pedal 83 is released or the integrated brake control system is actively depressurized by the automatic cruise system, it is determined that the integrated brake control system is in the depressurization process. It can be understood that when the integrated brake control system is in the pressurization state, that is, the brake pedal 83 is depressed or the integrated automatic control system is actively pressurized by the automatic cruise system, the pressure of the servo cylinder 81 rises, the second actual pressure rises and changes with the depth of the brake pedal 83 depressed by the driver or the control degree of the automatic cruise system, the pressure in the servo cylinder 81, that is, the second actual pressure, is acquired and monitored in real time, and 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 time is acquired as the second time.

[0053] At the end of braking, the driver releases the brake pedal 83 or the automatic cruise control system actively depressurizes, at which time the integrated brake control system is in the depressurization state, the pressure of the servo cylinder 81 decreases, the pressure in the servo cylinder 81, that is, the third actual pressure, is acquired and monitored in real time, and when the third actual pressure reaches the preset pressure, the volume of the servo cylinder 81 at this time is acquired as the third hydraulic volume, and the time at this time is acquired as the third time.

[0054] Among them, the pressure in the servo cylinder 81 can be monitored by the pressure sensor in the servo cylinder 81 to monitor the brake hydraulic pressure. The second hydraulic volume and the third hydraulic volume in the servo cylinder 81 can be calculated by measuring the displacement of the push rod through the motor angle sensor of the servo cylinder 81.

[0055] And in the process of the servo cylinder 81 transmitting brake fluid in the pressurization and depressurization working conditions, part of the brake fluid will stay in the pipeline or brake and other components. Through the whole vehicle test in the vehicle development stage, it is measured that when the pressure of the servo cylinder 81 reaches the preset pressure in the pressurization and depressurization working conditions, the output brake fluid volume of the servo cylinder 81 in the depressurization working condition is subtracted from the output brake fluid volume of the servo cylinder 81 in the pressurization working condition, and the difference is the system hysteresis required fluid volume.

[0056] The second brake fluid leakage amount can be obtained by the following formula:

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

[0058] Wherein, 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, V0 is the system hysteresis required fluid volume.

[0059] Specifically, in the case that the integrated brake control system does not leak, the difference between the third hydraulic volume and the second hydraulic volume is the same as the system hysteresis required hydraulic volume, and the second brake fluid leakage is zero. When the integrated brake control system leaks, there is a difference between the third hydraulic volume and the second hydraulic volume, and 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 third brake fluid leakage is obtained according to the first brake fluid leakage and the second brake fluid leakage, and further comprising step S510: selecting the maximum value of the first brake fluid leakage and the second brake fluid leakage as the third brake fluid leakage.

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

[0062] Optionally, the detection method further comprises step S600: obtaining a first leakage time used by the first brake fluid leakage in the leakage process; obtaining a leakage coefficient according to the first brake fluid leakage and a first standard table, wherein the first standard table is used to represent the relationship between the first brake fluid leakage 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 represent 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 standard table and the second standard table are parameter relationships obtained by calibration based on whether the demand of the driver stepping on the brake pedal 83 or the integrated brake control system actively boosting is met. The first standard table is used to represent the relationship between the first brake fluid leakage and the leakage coefficient, and the second standard table is used to represent the relationship between the first leakage event and the time coefficient. The range of the leakage coefficient and the time coefficient is [0-1]. The leakage severity coefficient is obtained by multiplying the leakage coefficient and the time coefficient, which balances the first brake fluid leakage and the first leakage time. The leakage severity coefficient is used as an analysis of the influence of the leakage of the brake fluid in the integrated brake control system on the vehicle braking safety, which can more closely match the actual braking demand changes to judge the severity of the leakage. Moreover, this method does not require active operation by the driver, and can be safely ensured without the driver's knowledge.

[0064] Optionally, in step S600, the first leakage time used by the first brake fluid leakage amount in the leakage process is obtained, and the detection method further comprises: when the first brake fluid leakage amount is greater than a first preset value, the first leakage time used by the first brake fluid leakage amount in the leakage process is obtained. During the operation of the integrated brake control system, the pressure, volume and other parameters of the brake fluid may be affected by the external environment such as temperature and change within a certain range. In the case that the integrated brake control system has no leakage, a larger change in the environment may cause the calculated first brake fluid leakage amount to be greater than zero. Therefore, the influence of environmental changes on the detection method can be understood through multiple tests, and the safety influence of the brake fluid leakage amount on the vehicle is considered to give a threshold range of the calculated first brake fluid leakage amount for leakage error discrimination, that is, the first preset value. 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 the leakage of the integrated brake control system or the leakage amount is extremely small and does not affect the braking safety of the vehicle, etc. Therefore, it is not necessary to calculate the leakage severity coefficient. In addition, in the integrated brake control system, sensor detection errors or deviations may also occur, which may also cause the first brake fluid leakage amount to have a small value and change. Therefore, the above method can also be used for exclusion.

[0065] Optionally, in step S600, the detection method further comprises: when the leakage severity coefficient is greater than or equal to a second preset value, controlling the instrument or central control screen of the vehicle to remind the driver. The driving safety of the vehicle can be ensured and the driving experience can be improved.

[0066] In other embodiments, the second brake fluid leakage amount obtained in step S500 can also use the calculation principle in step S600 to calculate a second severity coefficient, that is, the leakage total time used in the leakage process is calculated according to the second time and the third time; the first coefficient is obtained according to the second brake fluid leakage amount and a third standard table, wherein the third standard table is used to represent the relationship between the second brake fluid leakage amount and the first coefficient; the second coefficient is determined according to the leakage total time and a fourth standard table, wherein the fourth standard table is used to represent the relationship between the leakage total time and the second coefficient; the product of the first coefficient and the second coefficient is calculated to obtain the second severity coefficient, and the maximum value of the leakage severity coefficient and the second severity coefficient is selected as the third severity coefficient.

[0067] Specifically, the third standard table and the fourth standard table are parameter relationships obtained through calibration based on whether the driver's demand for stepping on the brake pedal 83 or the integrated brake control system active supercharging is met. The first coefficient and the second coefficient are both in the range of [0-1]. The second severity coefficient is obtained by multiplying the first coefficient and the second coefficient, which balances the second brake fluid leakage amount and the total leakage time. The maximum value of the leakage severity coefficient and the second severity coefficient is taken as an evaluation or analysis parameter for vehicle brake safety, i.e., the third severity coefficient is taken as the final leakage error rate, which not only can judge the severity of leakage in line with the actual brake demand changes, but also can maximize the safety and reliability of the vehicle.

[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: obtaining the first running state of the anti-lock braking system; when the first running state is the inactive state, the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod are obtained. It should be noted that the vehicle has an anti-lock braking system (ABS), and when the first running state of the anti-lock braking system is active, the pressure relief valve is frequently opened and closed, which can lead to unreasonable calculation results, and thus can lead to misjudgment of the leakage amount and the leakage degree of the integrated brake control system. Therefore, when the first running state of the anti-lock braking system is in the inactive state, the current first pressure relief volume and the actual stroke of the push rod are obtained for calculation, which can ensure the accuracy of the calculation results.

[0070] Step S103: obtaining the validity information of the signal received by the integrated brake control system; when the validity information is true, the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod are obtained. The valid signal received by the integrated brake control system, such as the pedal stroke valid in the internal signal, needs to be verified. If the verification fails, the artificial signal is considered to be unreliable.

[0071] Step S104: obtaining the second running state of the high-pressure system of the vehicle; when the second running state is in the high-pressure state, the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod are obtained. When the second running state is in the high-pressure state, the servo cylinder 81 will work.

[0072] It can be understood that the step S101: obtaining the first operating state of the anti-lock system; obtaining the validity information of the signal received by the integrated brake control system; obtaining the second operating state of the high-pressure system of the vehicle; obtaining the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod when the first operating state is the inactive state, and when the validity information is true, and when the second operating state is in the high-pressure state. When the leakage detection condition in step S101: the first operating state is the inactive state, the validity information is true, and the second operating state is in the high-pressure state, all meet, then the leakage detection method is started to detect the leakage.

[0073] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be realized by means of software and the necessary general hardware platform, and of course it can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes a plurality of instructions for making a terminal device (which can be a mobile phone, computer, server, or network device, etc.) execute the method described in each embodiment of the present application.

[0074] In the present embodiment, a brake fluid leakage detection system is also provided, which is used to implement the above embodiments and preferred embodiments, which have been described and will not be repeated. As used below, the term "module" is a combination of software and / or hardware that can implement a predetermined function. Although the system described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware is also possible and is contemplated.

[0075] As shown in Figure 5 A brake fluid leakage detection system includes:

[0076] The obtaining module 701 is configured to execute the step S100 described above: obtaining the first actual pressure of the servo cylinder 81 and the actual stroke of the push rod.

[0077] The analysis module 702 is configured to execute the steps S200 and S300 described above: calculating the first hydraulic volume of the servo cylinder 81 according to the first actual pressure; obtaining the actual hydraulic volume of the servo cylinder 81 according to the actual stroke and the parameter relationship curve, wherein the parameter relationship curve is used to represent the relationship between the push rod stroke and the volume of the servo cylinder 81.

[0078] The calculation module 703 is configured to execute the step S400 described above: obtaining the current first brake fluid leakage amount according to the actual hydraulic volume and the first hydraulic volume.

[0079] Optionally, the analysis module 702 is further configured to perform the step S210 of obtaining a brake moving speed of the push rod; and calculating a first hydraulic volume according to the first actual pressure and the brake moving speed.

[0080] Optionally, the calculation module 703 is further configured to perform the step S500 of obtaining a second actual pressure of the servo cylinder 81 when the integrated brake control system is pressurized; obtaining a second hydraulic volume of the servo cylinder 81 and a second time when the second actual pressure increases to a preset pressure; obtaining a third actual pressure of the servo cylinder 81 when the integrated brake control system is depressurized; obtaining a third hydraulic volume of the servo cylinder 81 and a third time when the third actual pressure decreases to the preset pressure; obtaining a second brake fluid leakage amount according to the second hydraulic volume, the third hydraulic volume, the second time, the third time and a system hysteresis required fluid amount, the system hysteresis required fluid amount being used to represent a difference between volumes of brake fluid delivered by the servo cylinder 81 in a pressurization working condition and a depressurization working condition when the pressure of the servo cylinder 81 reaches the preset pressure; and obtaining a third brake fluid leakage amount according to the first brake fluid leakage amount and the second brake fluid leakage amount.

[0081] Optionally, the calculation module 703 is further configured to perform the step S510 of selecting a 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 step S600 of obtaining a first leakage time used by the first brake fluid leakage amount in a leakage process; obtaining a leakage coefficient according to the first brake fluid leakage amount and a first standard table, the first standard table being used to represent a 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, the second standard table being used to represent a relationship between the first leakage time and the time coefficient; and calculating a 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 the step S500 can also be calculated according to the calculation principle in the step S600 to obtain a second severity coefficient, i.e., calculating a total leakage time used in the leakage process according to the second time and the third time; obtaining a first coefficient according to the second brake fluid leakage amount and a third standard table, the third standard table being used to represent a relationship between the second brake fluid leakage amount and the first coefficient; determining a second coefficient according to the total leakage time and a fourth standard table, the fourth standard table being used to represent a relationship between the total leakage time and the second coefficient; calculating a product of the first coefficient and the second coefficient to obtain the second severity coefficient; and selecting a maximum value between the leakage severity coefficient and the second severity coefficient as a third severity coefficient.

[0083] Optionally, the computing module 703 is further configured to execute: when the first brake fluid leakage amount is greater than the first preset value, obtaining a first leakage time used by the first brake fluid leakage amount in the leakage process. The detection method further comprises: when the leakage severity coefficient is greater than or equal to the second preset value, controlling the instrument or the central control screen of the vehicle to issue a reminder to the driver. The driving safety of the vehicle can be ensured, and the driving experience is improved, and the like.

[0084] Optionally, the computing module 703 is further configured to execute step S102: obtaining a first operating state of the anti-lock braking system; when the first operating state is a non-activated state, obtaining the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0085] Optionally, the computing module 703 is further configured to execute step S103: obtaining validity information of a signal received by the integrated brake control system; when the validity information is true, obtaining the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0086] Optionally, the computing module 703 is further configured to execute step S104: obtaining a second operating state of a 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 81 and the actual stroke of the push rod.

[0087] Optionally, the computing module 703 is further configured to execute step S101: obtaining a first operating state of the anti-lock braking system; obtaining validity information of a signal received by the integrated brake control system; obtaining a second operating state of a high-pressure system of the vehicle; when the first operating state is a non-activated state, and when the validity information is true, and when the second operating state is in a high-pressure state, obtaining the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0088] Optionally, specific examples in the present embodiment can refer to examples described in the above embodiments and optional implementation manners, which will not be described herein again.

[0089] Embodiments of the present application also provide a vehicle comprising a memory and a processor, the memory storing a computer program, and the processor is configured to run the computer program to execute the brake fluid leakage detection method described in any of the above embodiments.

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

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

[0092] Step S200: calculating a first hydraulic volume of the servo cylinder 81 according to the first actual pressure;

[0093] Step S300: obtaining an actual hydraulic volume of the servo cylinder 81 according to the actual stroke and a parameter relationship curve, wherein the parameter relationship curve is used to represent a relationship between a push rod stroke and a servo cylinder 81 volume.

[0094] Step S400: obtaining a current first brake fluid leakage amount according to the actual hydraulic volume and the first hydraulic volume.

[0095] Step S210: obtaining a brake moving speed of the push rod; calculating a first hydraulic volume according to the first actual pressure and the brake moving speed.

[0096] Step S500: when the integrated brake control system is pressurized, obtaining a second actual pressure of the servo cylinder 81; when the second actual pressure increases to a preset pressure, obtaining a second hydraulic volume and a second time of the servo cylinder 81; when the integrated brake control system is depressurized, obtaining a third actual pressure of the servo cylinder 81; when the third actual pressure decreases to the preset pressure, obtaining a third hydraulic volume and a third time of the servo cylinder 81; obtaining a second brake fluid leakage amount according to the second hydraulic volume, the third hydraulic volume, the second time, the third time and a system hysteresis required hydraulic amount, wherein the system hysteresis required hydraulic amount is used to represent a difference between volumes of brake fluids delivered by the servo cylinder 81 in pressurization and depressurization working conditions when the pressure of the servo cylinder 81 reaches the preset pressure; obtaining a third brake fluid leakage amount according to the first brake fluid leakage amount and the second brake fluid leakage amount.

[0097] Step S510: selecting a 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: obtaining a first leakage time used by the first brake fluid leakage amount in 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 represent a 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 represent a relationship between the first leakage time and the time coefficient; calculating a product of the leakage coefficient and the time coefficient to obtain a leakage severity coefficient.

[0099] In other embodiments, the second brake fluid leakage amount obtained in step S500 can also be calculated using the calculation principle in step S600 to calculate a second severity coefficient, that is, calculating a total leakage time used in the leakage process according to the second time and the third time; obtaining a first coefficient according to the second brake fluid leakage amount and a third standard table, wherein the third standard table is used to represent the relationship between the second brake fluid leakage amount and the first coefficient; determining a second coefficient according to the total leakage time and a fourth standard table, wherein the fourth standard table is used to represent the relationship between the total leakage time and the second coefficient; and calculating the product of the first coefficient and the second coefficient to obtain the second severity coefficient, and selecting the maximum value of the leakage severity coefficient and the second severity coefficient as the third severity coefficient.

[0100] When the first brake fluid leakage amount is greater than the first preset value, a first leakage time used by the first brake fluid leakage amount in the leakage process is obtained. The detection method further includes: when the leakage severity coefficient is greater than or equal to a second preset value, controlling the instrument or the central control screen of the vehicle to issue a reminder to the driver. The driving safety of the vehicle can be guaranteed, and the driving experience can be improved.

[0101] Step S102: obtaining a first running state of the anti-lock braking system; when the first running state is a non-activated state, obtaining a first hydraulic volume of the servo cylinder 81 and an actual stroke of the push rod.

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

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

[0104] Step S101: obtaining a first running state of the anti-lock braking system; obtaining validity information of a signal received by the integrated brake control system; obtaining a second running state of a high-pressure system of the vehicle; when the first running state is a non-activated state, when the validity information is true, and when the second running state is in a high-pressure state, obtaining the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0105] Optionally, specific examples in the present embodiment can refer to the examples described in the above embodiments and optional implementation manners, and the present embodiment will not be described here again.

[0106] The embodiments of the present application also provide a computer readable storage medium, and the storage medium stores a computer program, wherein the computer program is configured to execute the brake fluid leakage detection method described in any one of the above embodiments when running on a computer or a processor.

[0107] Optionally, in the present embodiment, the computer program described above can be configured to store a computer program for executing the steps of the control method in the preceding 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 according to the first actual pressure;

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

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

[0112] Step S210: Obtain the brake moving speed of the push rod; calculate the first hydraulic volume according to the first actual pressure and the brake moving speed.

[0113] Step S500: When the integrated brake control system is pressurized, obtain the second actual pressure of the servo cylinder 81; when the second actual pressure increases to reach a preset pressure, obtain the second hydraulic volume of the servo cylinder 81 and the second time; when the integrated brake control system is depressurized, obtain the third actual pressure of the servo cylinder 81; when the third actual pressure decreases to reach a preset pressure, obtain the third hydraulic volume of the servo cylinder 81 and the third time; obtain the second brake fluid leakage amount according to the second hydraulic volume, the third hydraulic volume, the second time, the third time, and the system hysteresis required fluid amount, wherein the system hysteresis required fluid amount is used to represent the difference between the volumes of brake fluid delivered by the servo cylinder 81 under pressurized working conditions and under depressurized working conditions when the pressure of the servo cylinder 81 reaches the preset pressure; obtain the third brake fluid leakage amount according to 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 used by the first brake fluid leakage amount in the leakage process; obtain the leakage coefficient according to the first brake fluid leakage amount and the first standard table, wherein the first standard table is used to represent the relationship between the first brake fluid leakage amount and the leakage coefficient; determine the time coefficient according to the first leakage time and the second standard table, wherein the second standard table is used to represent 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 calculated using the calculation principle in step S600 to calculate a second severity coefficient, that is, calculating a total leakage time used in the leakage process according to the second time and the third time; obtaining a first coefficient according to the second brake fluid leakage amount and a third standard table, wherein the third standard table is used to represent the relationship between the second brake fluid leakage amount and the first coefficient; determining a second coefficient according to the total leakage time and a fourth standard table, wherein the fourth standard table is used to represent the relationship between the total leakage time and the second coefficient; calculating the product of the first coefficient and the second coefficient to obtain the second severity coefficient, and selecting the maximum value of the leakage severity coefficient and the second severity coefficient as the third severity coefficient.

[0117] When the first brake fluid leakage amount is greater than the first preset value, a first leakage time used by the first brake fluid leakage amount in the leakage process is obtained. The detection method further includes: when the leakage severity coefficient is greater than or equal to a second preset value, controlling the instrument or the central control screen of the vehicle to issue a reminder to the driver. The driving safety of the vehicle can be guaranteed, and the driving experience is improved, and the like.

[0118] Step S102: obtaining a first running state of the anti-lock braking system; when the first running state is a non-activated state, obtaining a first hydraulic volume of the servo cylinder 81 and an actual stroke of the push rod.

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

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

[0121] Step S101: obtaining a first running state of the anti-lock braking system; obtaining validity information of a signal received by the integrated brake control system; obtaining a second running state of a high-pressure system of the vehicle; when the first running state is a non-activated state, when the validity information is true, and when the second running state is in a high-pressure state, obtaining the first hydraulic volume of the servo cylinder 81 and the actual stroke of the push rod.

[0122] Optionally, specific examples in the present embodiment can refer to the examples described in the above embodiments and optional implementation manners, and the present embodiment will not be described here.

[0123] In the above embodiments of the present application, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0124] In some embodiments of the present application, it should be understood that the disclosed technology can be implemented in other ways. Among them, the above-mentioned system embodiments are only illustrative, for example, the division of the modules can be a logical function division, and actual implementation can have another division mode, for example, a plurality of modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed modules can be through some interface, indirect coupling or communication connection between modules, which can be electrical or other forms.

[0125] The modules described as separate components can or can not be physically separated, and the components shown as modules can or can not be physical modules, i.e., they can be located in one place or distributed to multiple modules. Part or all of the modules can be selected to achieve the purpose of the present embodiment according to actual needs.

[0126] In addition, the functional modules in each embodiment of the present application can be integrated into a processing module, or each module can exist physically, or two or more modules can be integrated into one module. The integrated module can be realized in the form of hardware or in the form of a software functional module.

[0127] The integrated module, if realized in the form of a software functional module and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: a U disk, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0128] The above-mentioned is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A brake fluid leakage detection method characterized by, The detection method is applied to a vehicle with an integrated brake control system, the integrated brake control system has a servo cylinder, the servo cylinder includes a push rod for pushing brake fluid, the detection method comprises: Obtaining a first actual pressure of the servo cylinder and an actual stroke of the push rod; According to the first actual pressure, calculating a first hydraulic volume of the servo cylinder; According to the actual stroke and a parameter relationship curve, obtaining an actual hydraulic volume of the servo cylinder, wherein the parameter relationship curve is used to represent the relationship between the push rod stroke and the servo cylinder volume; According to the actual hydraulic volume and the first hydraulic volume, obtaining a current first brake fluid leakage amount; The detection method further comprises: obtaining a first leakage time used by the first brake fluid leakage amount in the 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 represent 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 represent the relationship between the first leakage time and the time coefficient; calculating the product of the leakage coefficient and the time coefficient to obtain a leakage severity coefficient; The vehicle includes an anti-lock braking system, obtaining the first hydraulic volume of the servo cylinder and the actual stroke of the push rod comprises: obtaining a first operating state of the anti-lock braking system; when the first operating state is a non-activated state, obtaining the first hydraulic volume of the servo cylinder and the actual stroke of the push rod.

2. The method of claim 1, wherein According to the first actual pressure, calculating a first hydraulic volume of the servo cylinder; Obtaining a brake moving speed of the push rod; According to the first actual pressure and the brake moving speed, calculating the first hydraulic volume.

3. The method of claim 1, wherein 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 a preset pressure, obtaining a second hydraulic volume of the servo cylinder and a second time; When the integrated brake control system is depressurized, obtaining a third actual pressure of the servo cylinder; When the third actual pressure decreases to the preset pressure, obtaining a third hydraulic volume of the servo cylinder and a third time; According to the second hydraulic volume, the third hydraulic volume, the second time, the third time, and a system hysteresis required fluid amount, obtaining a second brake fluid leakage amount, wherein the system hysteresis required fluid amount is used to represent the difference between the volumes of brake fluid delivered by the servo cylinder under pressurization and depressurization conditions when the pressure of the servo cylinder reaches the preset pressure; According to the first brake fluid leakage amount and the second brake fluid leakage amount, obtaining a third brake fluid leakage amount.

4. The method of claim 3, wherein According to the second hydraulic volume, the third hydraulic volume, the second time, the third time, and a system hysteresis required fluid amount, obtaining a second brake fluid leakage amount, comprises calculating by the following formula: q2=(V4-V3-V0) / (T3-T2); Wherein, 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, V0 is the system hysteresis required fluid amount.

5. The method of claim 3, wherein The third brake fluid leakage amount is obtained according to the first brake fluid leakage amount and the second brake fluid leakage amount, including: The maximum value of the first brake fluid leakage amount and the second brake fluid leakage amount is selected as the third brake fluid leakage amount.

6. The method of claim 1, wherein The current first brake fluid leakage amount is obtained according to the actual hydraulic volume and the first hydraulic volume, including calculating the first brake fluid leakage amount by the following formula: q1=d(V2-V1) / dt; Wherein, q1 is the first brake fluid leakage amount, V2 is the first hydraulic volume, V1 is the actual hydraulic volume, d(V2-V1) / dt is the derivative of the difference between the first hydraulic volume and the actual hydraulic volume.

7. The method of claim 3, wherein 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 depressurizes the integrated brake control system, it is determined that the integrated brake control system is in a depressurization process.

8. The method of claim 1, wherein, The first leakage time used by the first brake fluid leakage amount in the leakage process is obtained, including: When the first brake fluid leakage amount is greater than a first preset value, the first leakage time used by the first brake fluid leakage amount in the leakage process is obtained.

9. The method of claim 1, wherein The detection method further includes: 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.

10. The method of claim 1, wherein Obtaining the first hydraulic volume of the servo cylinder and the actual stroke of the push rod includes: Obtaining the effectiveness information of the signals received by the integrated brake control system; When the effectiveness information is true, the first hydraulic volume of the servo cylinder and the actual stroke of the push rod are obtained.

11. The method of claim 1, wherein 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, the first hydraulic volume of the servo cylinder and the actual stroke of the push rod are obtained.

12. A brake fluid leak detection system characterized by, Applied to a vehicle with an integrated brake control system, the integrated brake control system has a servo cylinder, the servo cylinder includes a push rod for pushing brake fluid, the detection system includes: An acquisition module is configured to acquire the first actual pressure of the servo cylinder and the actual stroke of the push rod; An analysis module is configured to calculate the 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 represent the relationship between the stroke of the push rod and the volume of the servo cylinder. The computing module is configured to: obtain a first brake fluid leakage amount according to the actual hydraulic volume and the first hydraulic volume; obtain a first leakage time used by the first brake fluid leakage amount in a leakage process; obtain a leakage coefficient according to the first brake fluid leakage amount and a first standard table, wherein the first standard table is configured to represent a relationship between the first brake fluid leakage amount and the leakage coefficient; obtain a time coefficient according to the first leakage time and a second standard table, wherein the second standard table is configured to represent a relationship between the first leakage time and the time coefficient; and obtain a leakage severity coefficient by multiplying the leakage coefficient and the time coefficient; and obtain the first hydraulic volume of the servo cylinder and the actual stroke of the push rod when the anti-lock system is in a non-activated state.

13. A vehicle comprising a memory and a processor, wherein, The memory stores a computer program, and the processor is configured to execute the computer program to perform the brake fluid leakage detection method in any one of claims 1 to 11.

14. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, and the computer program is configured to perform the brake fluid leakage detection method in any one of claims 1 to 11 when executed on a computer or a processor.

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