Hydraulic brake system diagnosis method and device, electronic equipment and storage medium

Abstract

The invention provides a hydraulic braking system diagnosis method and device, electronic equipment and a storage medium, and the hydraulic braking system diagnosis method comprises the steps that in the vehicle braking process, target pressure corresponding to a main cylinder of a hydraulic braking system is obtained; when the main cylinder starts to build pressure, the pressure in the main cylinder is monitored, and pressure change information is obtained; according to the pressure change information and the target pressure, whether the residual gas in the main cylinder exceeds a target threshold value or not is judged; and when the target threshold value is exceeded, outputting a fault reminding signal. Whether the residual gas in the main cylinder exceeds the threshold value or not is determined according to the target pressure and the pressure change information of the main cylinder in the vehicle braking process, and when the target threshold value is exceeded, the fault reminding signal is output to remind a user to overhaul the vehicle, so that the situation that the vehicle is overhauled after the brake fluid is manually injected under the vacuum-free injection condition can be avoided. And the problem that the braking performance of the vehicle is reduced due to inaccurate subjective judgment on the residual gas quantity is solved, so that the safety performance of the vehicle is improved.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a hydraulic brake system diagnosis method, device, electronic equipment and storage medium. Background Art

[0002] For the hydraulic brake system of the vehicle, vacuum filling is required to prevent residual gas in the brake system when filling the brake fluid. However, under certain non-vacuum filling conditions, after filling the brake fluid, if the gas remaining in the pipeline is not removed, it will affect the vehicle's braking performance and safety performance. At this time, two people are required to cooperate, one person repeatedly steps on the brake pedal, and the other person relaxes the bleed valve to let the gas and brake fluid in the pipeline be discharged together, and observe the state of the brake fluid flowing out of the brake caliper drain screw to determine whether the gas has been exhausted. When it is determined that no gas has been discharged, tighten the bleed valve. This method may lead to misjudgment. After the vehicle is on the road, it can only be judged subjectively by the pedal feel whether the brake fluid has been filled properly. The driver's subjective evaluation is affected by many factors and the evaluation result has a large error, which may lead to a decrease in the vehicle's braking performance. Summary of the invention

[0003] The embodiments of the present application provide a hydraulic brake system diagnostic method, device, electronic device and storage medium to solve the problem of how to determine whether air is discharged after brake fluid is filled.

[0004] In a first aspect, an embodiment of the present application provides a hydraulic brake system diagnosis method, the method comprising:

[0005] During the vehicle braking process, obtaining the target pressure corresponding to the master cylinder of the hydraulic brake system;

[0006] When the master cylinder starts to build up pressure, the pressure in the master cylinder is monitored to obtain pressure change information;

[0007] determining, based on the pressure change information and the target pressure, whether the residual gas in the master cylinder exceeds a target threshold;

[0008] When the residual gas in the master cylinder exceeds the target threshold, a fault warning signal is output.

[0009] In a second aspect, an embodiment of the present application further provides a hydraulic brake system diagnostic device, the device comprising:

[0010] An acquisition module, used for acquiring a target pressure corresponding to a master cylinder of a hydraulic brake system during vehicle braking;

[0011] A monitoring module, used to monitor the pressure in the master cylinder when the master cylinder starts to build pressure, and obtain pressure change information;

[0012] a judgment module, configured to judge whether the residual gas in the master cylinder exceeds a target threshold value according to the pressure change information and the target pressure;

[0013] The output module is used to output a fault warning signal when the residual gas in the master cylinder exceeds the target threshold.

[0014] In a third aspect, an embodiment of the present application provides an electronic device, which includes a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the above-mentioned hydraulic brake system diagnostic method when executed by the processor.

[0015] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the above-mentioned hydraulic brake system diagnostic method is implemented.

[0016] The embodiments of the present application include at least the following technical effects:

[0017] The technical solution of the embodiment of the present application is to obtain the target pressure and actual pressure change information of the master cylinder when the vehicle brakes, and then determine whether the residual gas in the master cylinder exceeds a threshold value based on the target pressure and the pressure change information, and when it is determined that the residual gas in the master cylinder exceeds the target threshold value, output a fault reminder signal to prompt the user to inspect the vehicle, thereby avoiding the problem of reduced braking performance of the vehicle due to inaccurate subjective judgment of the residual gas amount after manual filling of brake fluid without vacuum filling, thereby improving the safety performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0019] Figure 1 is a flow chart of a hydraulic brake system diagnostic method provided in an embodiment of the present application;

[0020] Figure 2 is a schematic diagram of the pressure change in the master cylinder during the master cylinder pressure building process in the embodiment of the present application;

[0021] Figure 3 is a structural schematic diagram of a hydraulic brake system diagnostic device provided in an embodiment of the present application;

[0022] Figure 4 A block diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0025] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the following processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0026] like Figure 1 As shown, an embodiment of the present application provides a hydraulic brake system diagnosis method, the method comprising:

[0027] Step 101 : during the vehicle braking process, obtaining a target pressure corresponding to a master cylinder of a hydraulic brake system.

[0028] Specifically, the master cylinder is the core component of the hydraulic brake system, usually located under the driver's seat. When the driver steps on the brake pedal, the master cylinder converts the mechanical movement of the pedal into hydraulic pressure, which is then transmitted to the brake oil pipe, and then the hydraulic pressure is transmitted to the brake of each wheel through the brake oil pipe, thereby generating braking force. During the vehicle braking process, the target pressure corresponding to the master cylinder is obtained. Here, the target pressure is the hydraulic pressure that the master cylinder needs to establish.

[0029] Step 102 , when the master cylinder starts to build up pressure, the pressure in the master cylinder is monitored to obtain pressure change information.

[0030] After obtaining the target pressure of the master cylinder, when the master cylinder starts to build pressure, the pressure in the master cylinder can be monitored by a pressure sensor arranged in the master cylinder to obtain pressure change information. The pressure change information here can be the change of the pressure in the master cylinder over time.

[0031] It should be noted that as the vehicle speed changes and the opening of the brake pedal changes, the target pressure corresponding to the master cylinder changes. The master cylinder sets the pressure in the master cylinder to the target pressure by building up pressure.

[0032] Step 103: judging whether the residual gas in the master cylinder exceeds a target threshold value according to the pressure change information and the target pressure.

[0033] After obtaining the target pressure and pressure change information, it is possible to determine whether the residual gas in the master cylinder exceeds the target threshold based on the pressure change information and the target pressure, wherein the target threshold is the maximum acceptable gas residual amount, and the target threshold needs to be calibrated based on testing and other means, and this application does not make any specific limitations.

[0034] Step 104: When the residual gas in the master cylinder exceeds the target threshold, a fault warning signal is output.

[0035] Specifically, if the residual gas in the master cylinder exceeds the target threshold, a fault reminder signal is output to remind the user that after adding brake fluid, there is still gas in the master cylinder and timely maintenance is required. The fault reminder signal can be output by lighting a brake system fault light on the instrument.

[0036] In the embodiment of the present application, the target pressure and actual pressure change information of the master cylinder are obtained when the vehicle is braking, and then whether the residual gas in the master cylinder exceeds a threshold is determined based on the target pressure and the pressure change information. When it is determined that the residual gas in the master cylinder exceeds the target threshold, a fault reminder signal is output to prompt the user to inspect the vehicle, thereby avoiding the problem of reduced braking performance of the vehicle due to inaccurate subjective judgment of the residual gas amount after manual filling of brake fluid without vacuum filling, thereby improving the safety performance of the vehicle.

[0037] In an optional embodiment of the present application, obtaining a target pressure corresponding to a master cylinder of a hydraulic brake system includes:

[0038] Get brake pedal travel information;

[0039] determining a required braking force according to the brake pedal travel information;

[0040] The target pressure is determined according to the required braking force.

[0041] Specifically, during the braking process, when obtaining the target pressure corresponding to the master cylinder, the brake pedal travel information can be collected through the brake pedal sensor, and the brake pedal travel information is used to characterize the pedal displacement information generated by the brake pedal being stepped on. Then, the required braking force is determined according to the brake pedal travel information, wherein the pedal displacement corresponding to the brake pedal travel information and the required braking force are positively correlated. After determining the required braking force, the target pressure in the master cylinder can be determined according to the required braking force.

[0042] The above implementation scheme of the present application determines the required braking force through the brake pedal travel information, and then determines the target pressure of the master cylinder. It can directly use the data collected during the operation of the brake control system without adding additional sensors, thus saving hardware costs.

[0043] In an optional embodiment of the present application, when the vehicle includes a brake energy recovery system, obtaining a target pressure corresponding to a master cylinder of the hydraulic brake system includes:

[0044] detecting the speed of the vehicle;

[0045] When the vehicle speed is less than a preset vehicle speed threshold, obtaining brake pedal travel information;

[0046] determining a target braking force corresponding to the hydraulic brake system according to the brake pedal stroke information;

[0047] A target pressure corresponding to the master cylinder is determined according to the target braking force.

[0048] Specifically, when the vehicle includes a braking energy recovery system, the vehicle is an electric vehicle, and the braking energy recovery system here can be an electric braking system. When the vehicle needs braking force, the hydraulic braking system and the braking energy recovery system each allocate a portion of the braking force, so that the vehicle enters a stable braking state while recovering the vehicle's kinetic energy. Normally, when the brake pedal is stepped on and the vehicle speed drops to a preset speed threshold, the motor's operating efficiency is low and the recoverable energy is reduced. Then the braking force generated by the braking energy recovery system gradually decreases as the vehicle speed decreases. At this time, the hydraulic braking system needs to gradually compensate to meet the vehicle's braking force requirements. The preset speed threshold here can be a value between 10km / h and 20km / h, for example, it can be 10km / h. Since the hydraulic brake system generates braking force to compensate for the vehicle's braking force requirements only when the vehicle speed drops to a preset speed threshold, it is possible to detect whether there is residual gas in the master cylinder when the hydraulic brake system starts working. In other words, the vehicle speed can be detected. When it is detected that the vehicle speed is less than the preset speed threshold, the brake pedal travel information is obtained, and then the target braking force corresponding to the hydraulic brake system is determined based on the brake pedal travel information, and then the target pressure corresponding to the master cylinder in the hydraulic brake system is determined.

[0049] In the above implementation scheme of the present application, when the vehicle includes a brake energy recovery system, the target pressure corresponding to the master cylinder can be determined when the vehicle speed drops below a preset speed threshold, so that the hydraulic brake system can be detected in time to see if there is a fault, thereby avoiding affecting the braking performance of the vehicle and improving driving safety.

[0050] On the basis of the above embodiment, the present application further provides an optional embodiment, which determines the target braking force corresponding to the hydraulic brake system according to the brake pedal stroke information, including:

[0051] determining a required braking force according to the brake pedal travel information;

[0052] Acquire a first braking force generated by a braking energy recovery system;

[0053] The target braking force is determined according to the required braking force and the first braking force.

[0054] Specifically, when the vehicle includes a brake energy recovery system, in the process of determining the target braking force of the hydraulic brake system according to the brake pedal information, the required braking force of the vehicle can be determined according to the brake pedal stroke information. Since the braking force generated by the brake energy recovery system is gradually withdrawn at this time, and the hydraulic brake system gradually compensates, the required braking force at this time includes two parts, one part is generated by the brake energy recovery system, that is, the first braking force, and the other part is generated by the hydraulic brake system, that is, the target braking force. After determining the required braking force, the first braking force is obtained, and then the target braking force corresponding to the hydraulic brake system can be determined according to the required braking force and the first braking force.

[0055] In the above implementation scheme of the present application, when determining the target braking force, it is necessary to determine the required braking force and the first braking force, so that when the hydraulic braking system starts to compensate for the braking force, the target braking force required to be provided by the hydraulic braking system can be determined, and then when the hydraulic braking system starts to build pressure, it is possible to timely diagnose whether there is residual gas in the master cylinder of the hydraulic braking system.

[0056] In an optional embodiment of the present application, judging whether the residual gas in the master cylinder exceeds a target threshold value according to the pressure change information and the target pressure includes:

[0057] Acquire a first moment corresponding to when the pressure in the master cylinder reaches the target pressure;

[0058] determining a first pressure corresponding to the master cylinder at the first moment according to the pressure change information;

[0059] When the difference between the first pressure and the target pressure is greater than a preset pressure threshold, determining a second time corresponding to a preset pressure fluctuation value occurring in the master cylinder according to the pressure change information;

[0060] Obtaining the time interval between the second moment and the first moment;

[0061] Obtaining a target duration corresponding to the target threshold;

[0062] When the time interval is greater than the target time length, it is determined that the residual gas in the master cylinder exceeds a target threshold.

[0063] Specifically, Figure 2 As shown, curve L1 is the ideal curve when the master cylinder builds pressure, and curve L2 is the actual pressure building curve obtained based on the pressure change information. When judging whether the residual gas in the master cylinder exceeds the target threshold value according to the pressure change information corresponding to the master cylinder and the target pressure P0, first obtain the first moment t1 corresponding to the pressure in the master cylinder reaching the target pressure P0, that is, when there is no air remaining in the master cylinder, obtain the time required for the master cylinder to build pressure from the beginning to the pressure reaching the target pressure. This time is determined by calculation, and then the time corresponding to the pressure reaching the target pressure, that is, the first moment t1, can be determined through this time and the current time. After determining the first moment t1, the actual pressure value of the pressure in the master cylinder at the first moment t1, that is, the first pressure P1, can be obtained through the pressure change information. If there is no air remaining in the master cylinder, that is, the master cylinder can build pressure normally, the first pressure P1 should be approximately equal to the target pressure P0. However, if there is air remaining in the master cylinder, the difference between the first pressure P1 and the target pressure P0 at the first moment t1 is greater than the preset pressure threshold. At this time, the braking force generated by the hydraulic braking system cannot compensate in time for the lack of required braking force caused by the gradual decrease in the braking force generated by the brake energy recovery system. The hydraulic braking system will increase the motor speed to speed up the pressure building. The motor here refers to the motor used for master cylinder pressure building in the hydraulic braking system. However, when the pressure is built quickly, pressure overshoot will occur, resulting in pressure fluctuations, that is, the pressure in the master cylinder will reach the preset pressure fluctuation value P2, wherein P2=P0+△P, △P is the difference between the preset pressure fluctuation value generated after the motor speed is increased and the target pressure, and the △P can be set in advance, so as to obtain the preset pressure fluctuation value P2 according to P0 and △P. At this time, the second time t2 corresponding to the preset pressure fluctuation value P2 of the master cylinder pressure can be determined through the pressure change information, and then the time interval between the second time t2 and the first time t1 can be obtained.

[0064] Furthermore, the target threshold is the maximum acceptable gas residual amount. According to the target threshold, the pressure compensation time corresponding to the target threshold, i.e., the target duration, can be determined. When the time interval between the second moment t2 and the first moment t1 is greater than the target duration, it indicates that the residual gas in the master cylinder is greater than the target threshold, i.e., the residual gas in the master cylinder is greater than the maximum acceptable gas residual amount. At this time, a fault reminder message needs to be output to remind the driver that the braking performance of the vehicle is affected due to the residual gas in the master cylinder, and timely maintenance is required.

[0065] In the above implementation scheme of the present application, the first moment is determined by the target pressure, and then the first pressure is determined. Then, by comparing the first pressure with the target pressure, it can be determined whether there is any gas remaining in the master cylinder. Then, by determining the second moment when the pressure fluctuates, the time interval is obtained. By judging the time interval and the target duration, it is determined whether the residual gas exceeds the target threshold value. Therefore, by detecting the gas pressure in the master cylinder during the pressure building process, self-diagnosis of the residual gas in the master cylinder is achieved.

[0066] In an optional embodiment of the present application, obtaining the first moment corresponding to when the pressure in the master cylinder reaches the target pressure includes:

[0067] Acquire a first rotation speed corresponding to a motor of the hydraulic brake system;

[0068] determining a first time required for the pressure in the master cylinder to reach the target pressure according to the first speed and the target pressure;

[0069] The first time is determined according to the first duration and the current time.

[0070] Specifically, when obtaining the first moment corresponding to the pressure in the master cylinder reaching the target pressure, it is necessary to obtain the first speed corresponding to the motor in the hydraulic brake system, and then determine the pressure building time based on the first speed and the target pressure, that is, the first time required for the pressure in the master cylinder to reach the target pressure, and then determine the first moment based on the first time and the current moment. The first moment here is the moment when the pressure in the master cylinder reaches the target pressure when there is no gas remaining in the master cylinder obtained by calculation.

[0071] The above implementation scheme of the present application can directly obtain data, i.e., the first rotational speed, from the hydraulic braking system when determining the first moment, and then calculate the first moment, so as to facilitate determining whether there is residual gas in the master cylinder based on the first moment and pressure change information, and whether the braking force generated during the pressure building process of the master cylinder can meet the required braking force.

[0072] In an optional embodiment of the present application, obtaining a target duration corresponding to the target threshold includes:

[0073] Obtaining a current rotation speed corresponding to a motor of the hydraulic brake system;

[0074] The target duration is determined according to the current rotation speed, the target threshold value and the preset pressure fluctuation value.

[0075] Specifically, when obtaining the target duration, it is also necessary to obtain the current speed of the motor in the hydraulic brake system, where the current speed is the speed after the motor increases when the braking force generated by the hydraulic brake system fails to compensate for the required braking force in time. Then, the target duration can be determined based on the current speed, the target threshold, and the preset pressure fluctuation value.

[0076] It should be noted that the target duration is the time it takes for the motor in the hydraulic brake system to control the master cylinder pressure to reach the preset pressure fluctuation value at the current speed when the acceptable gas residual amount is the target threshold. The target duration is determined by the target threshold, the current motor speed and the preset pressure fluctuation value.

[0077] The above-mentioned implementation scheme of the present application obtains the current speed of the motor and determines the target duration based on the current speed, the target threshold and the preset pressure fluctuation value, so that the time interval between the second moment and the first moment can be compared with the target duration to determine whether the residual gas in the master cylinder exceeds the target threshold. Then, when the residual gas in the master cylinder exceeds the target threshold, a fault reminder signal can be output to prompt the user to inspect the vehicle, so as to avoid the problem of reduced braking performance of the vehicle due to inaccurate subjective judgment of the residual gas amount after manual filling of brake fluid without vacuum filling, thereby improving the safety performance of the vehicle.

[0078] The above introduces the hydraulic brake system diagnostic method provided in the embodiment of the present application. The following will introduce the hydraulic brake system diagnostic device provided in the embodiment of the present application in conjunction with the accompanying drawings.

[0079] like Figure 3 As shown, an embodiment of the present invention further provides a hydraulic brake system diagnostic device, the device comprising:

[0080] An acquisition module 301 is used to acquire a target pressure corresponding to a master cylinder of a hydraulic brake system during vehicle braking;

[0081] A monitoring module 302 is used to monitor the pressure in the master cylinder when the master cylinder starts to build pressure, and obtain pressure change information;

[0082] A judgment module 303, configured to judge whether the residual gas in the master cylinder exceeds a target threshold value according to the pressure change information and the target pressure;

[0083] The output module 304 is used to output a fault warning signal when the residual gas in the master cylinder exceeds the target threshold.

[0084] Optionally, when the vehicle includes a braking energy recovery system, the acquisition module includes:

[0085] A detection submodule, used for detecting the speed of the vehicle;

[0086] A first acquisition submodule, configured to acquire brake pedal travel information when the vehicle speed is less than a preset vehicle speed threshold;

[0087] A first determination submodule, configured to determine a target braking force corresponding to the hydraulic brake system according to the brake pedal stroke information;

[0088] The second determining submodule is used to determine a target pressure corresponding to the master cylinder according to the target braking force.

[0089] Optionally, the first determining submodule includes:

[0090] a first determining unit, configured to determine a required braking force according to the brake pedal travel information;

[0091] A first acquisition unit, used to acquire a first braking force generated by a braking energy recovery system;

[0092] The second determining unit is configured to determine the target braking force according to the required braking force and the first braking force.

[0093] Optionally, the acquisition module includes:

[0094] The second acquisition submodule is used to acquire brake pedal travel information;

[0095] A third determination submodule, configured to determine a required braking force according to the brake pedal travel information;

[0096] The fourth determination submodule is used to determine the target pressure according to the required braking force.

[0097] Optionally, the judging module includes:

[0098] A third acquisition submodule is used to acquire a first moment corresponding to when the pressure in the master cylinder reaches the target pressure;

[0099] a fifth determining submodule, configured to determine a first pressure corresponding to the master cylinder at the first moment according to the pressure change information;

[0100] a sixth determination submodule, configured to determine, when the difference between the first pressure and the target pressure is greater than a preset pressure threshold, a second time corresponding to a preset pressure fluctuation value occurring in the master cylinder according to the pressure change information;

[0101] A fourth acquisition submodule, used to acquire a time interval between the second moment and the first moment;

[0102] A fifth acquisition submodule, used to acquire a target duration corresponding to the target threshold;

[0103] The seventh determination submodule is configured to determine, when the time interval is greater than a target duration, that the residual gas in the master cylinder exceeds a target threshold.

[0104] Optionally, the third acquisition submodule includes:

[0105] A second acquisition unit, used to acquire a first rotation speed corresponding to a motor of the hydraulic brake system;

[0106] a third determining unit, configured to determine, according to the first rotational speed and the target pressure, a first time required for the pressure in the master cylinder to reach the target pressure;

[0107] The fourth determining unit is used to determine the first time according to the first duration and the current time.

[0108] Optionally, the fifth acquisition submodule includes:

[0109] A third acquisition unit, used to acquire a current rotation speed corresponding to a motor in the hydraulic brake system;

[0110] The fifth determining unit is used to determine the target duration according to the current rotation speed, the target threshold value and the preset pressure fluctuation value.

[0111] The hydraulic brake system diagnostic device provided by the present application obtains the target pressure and actual pressure change information of the master cylinder when the vehicle brakes, and then determines whether the residual gas in the master cylinder exceeds a threshold value based on the target pressure and the pressure change information. When it is determined that the residual gas in the master cylinder exceeds the target threshold value, a fault reminder signal is output to prompt the user to inspect the vehicle, thereby avoiding the problem of reduced braking performance of the vehicle due to inaccurate subjective judgment of the residual gas amount after manual filling of brake fluid without vacuum filling, thereby improving the safety performance of the vehicle.

[0112] An embodiment of the present application also provides an electronic device, including: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the various processes of the above-mentioned hydraulic brake system diagnostic method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0113] For example, Figure 4 A schematic diagram of the physical structure of an electronic device is shown.

[0114] like Figure 4As shown, the electronic device may include: a processor 410, a communication interface 420, a memory 430 and a communication bus 440, wherein the processor 410, the communication interface 420 and the memory 430 communicate with each other through the communication bus 440. The processor 410 may call the logic instructions in the memory 430, and the processor 410 is used to perform the following steps: during the vehicle braking process, obtaining the target pressure corresponding to the master cylinder of the hydraulic brake system; when the master cylinder starts to build pressure, monitoring the pressure in the master cylinder to obtain pressure change information; judging whether the residual gas in the master cylinder exceeds the target threshold value according to the pressure change information and the target pressure; when the residual gas in the master cylinder exceeds the target threshold value, outputting a fault reminder signal.

[0115] In addition, the logic instructions in the above-mentioned memory 430 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art, and the computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk.

[0116] An embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the various processes of the above-mentioned hydraulic brake system diagnostic method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0117] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0118] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, 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, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0119] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

[0120] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the embodiments of the present invention can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0121] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0122] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0123] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0124] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0125] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, or optical disks.

[0126] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for diagnosing a hydraulic brake system, characterized in that: include: During the vehicle braking process, obtaining the target pressure corresponding to the master cylinder of the hydraulic brake system; When the master cylinder starts to build up pressure, the pressure in the master cylinder is monitored to obtain pressure change information; determining, based on the pressure change information and the target pressure, whether the residual gas in the master cylinder exceeds a target threshold; When the residual gas in the master cylinder exceeds the target threshold, a fault warning signal is output.

2. The hydraulic brake system diagnostic method according to claim 1, characterized in that: Obtain the target pressure corresponding to the master cylinder of the hydraulic brake system, including: Get brake pedal travel information; determining a required braking force according to the brake pedal travel information; The target pressure is determined according to the required braking force.

3. The hydraulic brake system diagnostic method according to claim 1, characterized in that: When the vehicle includes a brake energy recovery system, obtaining a target pressure corresponding to a master cylinder of the hydraulic brake system includes: detecting the speed of the vehicle; When the vehicle speed is less than a preset vehicle speed threshold, obtaining brake pedal travel information; determining a target braking force corresponding to the hydraulic brake system according to the brake pedal stroke information; A target pressure corresponding to the master cylinder is determined according to the target braking force.

4. The hydraulic brake system diagnostic method according to claim 2, characterized in that: Determining a target braking force corresponding to the hydraulic brake system according to the brake pedal stroke information includes: determining a required braking force according to the brake pedal travel information; Acquire a first braking force generated by a braking energy recovery system; The target braking force is determined according to the required braking force and the first braking force.

5. The hydraulic brake system diagnostic method according to claim 1, characterized in that: Judging whether the residual gas in the master cylinder exceeds a target threshold value according to the pressure change information and the target pressure includes: Acquire a first moment corresponding to when the pressure in the master cylinder reaches the target pressure; determining a first pressure corresponding to the master cylinder at the first moment according to the pressure change information; When the difference between the first pressure and the target pressure is greater than a preset pressure threshold, determining a second time corresponding to a preset pressure fluctuation value occurring in the master cylinder according to the pressure change information; Obtaining the time interval between the second moment and the first moment; Obtaining a target duration corresponding to the target threshold; When the time interval is greater than the target time length, it is determined that the residual gas in the master cylinder exceeds a target threshold.

6. The hydraulic brake system diagnostic method according to claim 5, characterized in that: Obtaining the first moment when the pressure in the master cylinder reaches the target pressure, comprising: Acquire a first rotation speed corresponding to a motor of the hydraulic brake system; determining a first time required for the pressure in the master cylinder to reach the target pressure according to the first speed and the target pressure; The first time is determined according to the first duration and the current time.

7. The hydraulic brake system diagnostic method according to claim 5, characterized in that: Obtaining a target duration corresponding to the target threshold includes: Obtaining a current rotation speed corresponding to a motor in the hydraulic brake system; The target duration is determined according to the current rotation speed, the target threshold value and the preset pressure fluctuation value.

8. A hydraulic brake system diagnostic device, characterized in that: include: An acquisition module, used for acquiring a target pressure corresponding to a master cylinder of a hydraulic brake system during vehicle braking; A monitoring module, used to monitor the pressure in the master cylinder when the master cylinder starts to build pressure, and obtain pressure change information; a judgment module, configured to judge whether the residual gas in the master cylinder exceeds a target threshold value according to the pressure change information and the target pressure; The output module is used to output a fault warning signal when the residual gas in the master cylinder exceeds the target threshold.

9. An electronic device, characterized in that: The method comprises a processor, a memory and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the hydraulic brake system diagnostic method as claimed in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the hydraulic brake system diagnostic method according to any one of claims 1 to 7 are implemented.

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