Vacuum pump control method, device, vehicle and storage medium

Abstract

The present application relates to the technical field of vehicles, in particular to a vacuum pump control method and device, a vehicle and a storage medium, wherein the method comprises: obtaining an actual air pressure in a vacuum tank; controlling the vacuum pump to work according to a start-stop threshold of the vacuum pump and the actual air pressure, and obtaining an actual air pumping duration of the vacuum pump in one or more air pressure intervals; calculating an actual ambient air pressure outside the vacuum tank according to the actual air pumping duration of each air pressure interval and a corresponding reference air pumping duration, and determining the start-stop threshold of the vacuum pump at the next working time based on the actual ambient air pressure. Thus, when the air pressure information outside the vacuum tank is invalid in the prior art, the controller cannot regulate the air pressure in the tank according to the environmental changes, which may cause the vehicle to have insufficient braking capacity in high-altitude areas, thereby causing safety hazards and other problems.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a vacuum pump control method and device, a vehicle and a storage medium. BACKGROUND

[0002] New energy vehicles use a vacuum pump to provide a vacuum source. In order to ensure that the tank has sufficient vacuum degree to provide good braking performance, and considering the working life and continuous working time of the vacuum pump, in the related technology, the controller can control the vacuum pump to work when the tank pressure is greater than P on , and stop the vacuum pump from working when the tank pressure is less than P off .

[0003] However, the ability of the vacuum tank to provide assistance depends on the pressure difference between the inside and outside of the tank, P on and P off are not fixed values, and the controller will adjust the start-stop points P on and P off according to the change of the tank outside air pressure value. As the atmospheric pressure decreases with the increase of altitude, the values of P on and P off decrease to ensure sufficient assistance ability. Therefore, when the controller cannot obtain the tank outside air pressure due to failure of the tank outside air pressure sensor or other reasons, the controller cannot regulate the tank pressure according to the change of altitude, which may result in insufficient braking ability in high altitude areas, thereby causing driving safety hazards. SUMMARY

[0004] One of the purposes of the present application is to provide a vacuum pump control method to solve the problem that when the vacuum tank outside air pressure information fails in the prior art, the controller cannot regulate the tank pressure according to the change of environment, which may result in insufficient braking ability of the vehicle in high altitude areas, thereby causing safety hazards. The second purpose is to provide a vacuum pump control device, the third purpose is to provide a vehicle, and the fourth purpose is to provide a storage medium.

[0005] In order to achieve the above purposes, the technical solutions adopted by the present application are as follows:

[0006] A vacuum pump control method, comprising: obtaining the actual air pressure in the vacuum tank; controlling the vacuum pump to work according to the start-stop threshold of the vacuum pump and the actual air pressure, and obtaining the actual pumping time of the vacuum pump in one or more air pressure intervals; calculating the actual ambient air pressure outside the vacuum tank according to the actual pumping time of each air pressure interval and the corresponding reference pumping time, and determining the start-stop threshold of the vacuum pump at the next working time based on the actual ambient air pressure.

[0007] According to the technical means, the vacuum pump can be controlled based on the start-stop threshold of the vacuum pump and the actual air pressure, and the actual ambient air pressure outside the vacuum tank and the start-stop threshold of the next operation of the vacuum pump are calculated based on the actual air extraction duration and the corresponding reference air extraction duration when the vacuum pump is working, so that the ambient atmospheric pressure outside the tank can be inferred by the tank air pressure and the working state of the vacuum pump, and the vacuum pump is controlled based on the ambient atmospheric pressure, so that the vehicle has good braking performance when the air pressure outside the tank changes, the driving safety is improved, the driving altitude environment is improved, the actual use needs are met, and the user experience is improved.

[0008] Further, the actual ambient air pressure outside the vacuum tank is calculated according to the actual air extraction duration and the corresponding reference air extraction duration of each air pressure interval, including: obtaining the reference air extraction duration of one or more air pressure intervals under each ambient air pressure; calculating the air pressure variance corresponding to each ambient air pressure according to the air pressure difference between the actual air extraction duration and the corresponding reference air extraction duration of all air pressure intervals; and determining the ambient air pressure corresponding to the minimum air pressure variance as the actual ambient air pressure outside the vacuum tank.

[0009] According to the technical means, the actual ambient air pressure value outside the vacuum tank can be calculated by calculating the variance of the air extraction duration and the corresponding reference air extraction duration in the air pressure interval, so that the actual ambient air pressure value can be obtained in time, and the controller can control the vacuum pump in time to improve the driving safety and meet the actual use needs.

[0010] Further, the reference air extraction duration of one or more air pressure intervals under each ambient air pressure is obtained, and the method further includes: taking the air pressure interval as an index, querying a pre-established database, and outputting the reference air extraction duration of each ambient air pressure corresponding to the air pressure interval, wherein the database stores the reference air extraction duration of a plurality of air pressure intervals under each ambient air pressure obtained by calibration.

[0011] According to the technical means, the reference value of the air extraction duration in the corresponding air pressure interval can be obtained by querying the database, and data basis is provided for the calculation of the actual ambient air pressure.

[0012] Further, before obtaining the actual air extraction duration of the vacuum pump in one or more air pressure intervals, the method further includes: detecting whether the air pressure signal of the air pressure sensor outside the vacuum tank is lost; if the air pressure signal is lost, obtaining the cumulative driving mileage of the vehicle; and when the cumulative driving mileage is greater than a preset driving mileage, obtaining the actual air extraction duration of the vacuum pump in one or more air pressure intervals.

[0013] According to the technical means, the embodiment of the application can obtain the driving mileage of the vehicle and the actual pumping time after detecting loss of the air pressure signal, provide a data basis for calculating the actual ambient air pressure after the air pressure signal fails, and realize corresponding control of the vacuum pump.

[0014] Further, after determining the start-stop threshold of the next working time of the vacuum pump based on the actual ambient air pressure, the method further comprises: restarting the accumulation of the driving mileage of the vehicle until the air pressure signal is detected.

[0015] According to the technical means, the embodiment of the application can restart the accumulation of the driving mileage of the vehicle after confirming the start-stop threshold of the next working time of the vacuum pump, ensure that the driving mileage of the vehicle is recorded before the next calculation, reduce errors caused by the driving mileage of the vehicle not being recorded in time, enable the controller to timely control the vacuum pump, improve the intelligence of the scheme, and meet actual use needs.

[0016] Further, the accumulated driving mileage comprises the driving mileage obtained by restarting the accumulation or the driving mileage obtained by accumulating from the moment when the air pressure signal is lost.

[0017] Further, the control of the vacuum pump according to the start-stop threshold of the vacuum pump and the actual air pressure comprises: obtaining the current start-stop threshold of the vacuum pump, wherein the current start-stop threshold is the start-stop threshold determined according to the air pressure signal before the air pressure signal is lost, or the start-stop threshold calculated according to the actual pumping time of the last working time of the vacuum pump; when the actual air pressure is greater than the start threshold, controlling the vacuum pump to start working, and when the actual air pressure is less than or equal to the stop threshold, controlling the vacuum pump to stop working.

[0018] According to the technical means, the embodiment of the application can determine whether to start the vacuum pump by comparing the start threshold of the vacuum pump with the actual air pressure, avoid unnecessary loss caused by continuous working of the vacuum pump under unnecessary conditions, improve the service life of the vacuum pump, and meet actual use needs.

[0019] A vacuum pump control device comprises: an obtaining module configured to obtain an actual air pressure in a vacuum tank; a control module configured to control working of the vacuum pump according to a start-stop threshold of the vacuum pump and the actual air pressure, and obtain actual pumping time of the vacuum pump in one or more air pressure intervals; and a calculation module configured to calculate an actual ambient air pressure outside the vacuum tank according to the actual pumping time of each air pressure interval and a corresponding reference pumping time, and determine a start-stop threshold of the next working time of the vacuum pump based on the actual ambient air pressure.

[0020] Further, the calculation module is further configured to: acquire the reference pumping time of one or more pressure intervals under each environment pressure; calculate the pressure variance corresponding to each environment pressure according to the pressure difference between the actual pumping time and the corresponding reference pumping time of all pressure intervals; and determine the environment pressure corresponding to the minimum pressure variance as the actual environment pressure outside the vacuum tank.

[0021] Further, the calculation module is further configured to: query the pre-established database with the pressure interval as the index, and output the reference pumping time of each environment pressure corresponding to the pressure interval, wherein the database stores the reference pumping time of multiple pressure intervals under each environment pressure obtained through calibration.

[0022] Further, the control module is further configured to: detect whether the pressure signal of the environment pressure sensor outside the vacuum tank is lost; if the pressure signal is lost, acquire the cumulative driving mileage of the vehicle; and acquire the actual pumping time of the vacuum pump in one or more pressure intervals when the cumulative driving mileage is greater than a preset driving mileage.

[0023] Further, the calculation module is further configured to: restart the cumulative driving mileage of the vehicle until the pressure signal is detected.

[0024] Further, the cumulative driving mileage includes the driving mileage obtained by restarting the cumulative driving mileage or the driving mileage obtained by accumulating from the time when the pressure signal is lost.

[0025] Further, the control module is further configured to: acquire the current start-stop threshold of the vacuum pump, wherein the current start-stop threshold is a start-stop threshold determined according to the pressure signal before the pressure signal is lost, or a start-stop threshold calculated according to the actual pumping time when the vacuum pump works last time; and control the vacuum pump to start working when the actual pressure is greater than the start threshold, and control the vacuum pump to stop working when the actual pressure is less than or equal to the stop threshold.

[0026] An automobile, a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the vacuum pump control method as described in the above embodiments.

[0027] A computer readable storage medium having a computer program stored thereon, the program being executable by a processor to implement the vacuum pump control method as described in the above embodiments.

[0028] The beneficial effects of the present application are as follows:

[0029] (1) The embodiment of the present application can control the vacuum pump based on the start-stop threshold of the vacuum pump and the actual air pressure, and calculate the actual ambient air pressure outside the vacuum tank and the start-stop threshold of the next operation of the vacuum pump based on the actual pumping time and the corresponding reference pumping time when the vacuum pump is working. Therefore, the embodiment of the present application can infer the atmospheric pressure outside the tank by the tank pressure and the working state of the vacuum pump, and control the vacuum pump based on this, so that the vehicle also has good braking performance when the tank pressure changes, improves the driving safety, improves the driving altitude environment, meets the actual use needs, and improves the user experience;

[0030] (2) The embodiment of the present application can calculate the variance of the pumping time and the corresponding reference pumping time in the air pressure interval to determine the actual ambient air pressure value outside the vacuum tank. Therefore, the embodiment of the present application can obtain the real-time ambient air pressure value outside the tank in time, so that the controller can control the vacuum pump in time, improve the driving safety, and meet the actual use needs;

[0031] (3) The embodiment of the present application can query the reference value of the pumping time in the corresponding air pressure interval through the database to provide a data basis for the calculation of the actual ambient air pressure;

[0032] (4) The embodiment of the present application can obtain the driving mileage and the actual pumping time of the vehicle after detecting the loss of the air pressure signal, and provide a data basis for the calculation of the actual ambient air pressure after the air pressure signal fails, so as to realize the corresponding control of the vacuum pump;

[0033] (5) The embodiment of the present application can restart the accumulation of the vehicle driving mileage after confirming the start-stop threshold of the next operation time of the vacuum pump, ensure that the vehicle driving mileage is recorded before the next calculation, reduce the error caused by the vehicle driving mileage not being recorded in time, so that the controller can control the vacuum pump in time, improve the intelligence of the scheme, and meet the actual use needs;

[0034] (6) The embodiment of the present application can determine whether to start the vacuum pump by comparing the start threshold of the vacuum pump and the actual air pressure, avoid unnecessary loss of the vacuum pump working continuously, improve the service life of the vacuum pump, and meet the actual use needs.

[0035] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The flowchart of the vacuum pump control method according to the present application is shown;

[0037] Figure 2 The example diagram of the new energy vehicle vacuum pump system according to the present application is shown;

[0038] Figure 3 A schematic diagram of an atmospheric pressure failure control process according to the present application;

[0039] Figure 4 A schematic diagram of a database storing data according to the present application;

[0040] Figure 5 A schematic diagram of a vacuum pump control device according to the present application;

[0041] Figure 6 A schematic diagram of a vehicle according to the present application. DETAILED DESCRIPTION

[0042] Other advantages and effects of the present application can be easily understood by those skilled in the art from the above description of the embodiments of the present application. The present application can also be implemented or applied in other different embodiments, and various modifications or changes can be made to the details of the present application based on different views and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, and are not intended to limit the protection scope of the present application.

[0043] It should be noted that the diagrams provided in the following embodiments only schematically illustrate the basic concepts of the present application, and only show the components related to the present application in the diagrams, rather than being drawn according to the number, shape and size of the components in actual implementation. The shapes, number and proportions of the components in actual implementation can be arbitrarily changed, and the layout pattern of the components can also be more complex.

[0044] Specifically, Figure 1 A schematic diagram of a vacuum pump control method according to an embodiment of the present application.

[0045] As Figure 1 shown, the vacuum pump control method comprises the following steps:

[0046] In step S101, the actual air pressure in the vacuum tank is obtained.

[0047] It should be noted that the actual air pressure in the vacuum tank can be obtained in at least one way in the embodiments of the present application, such as being obtained through a vehicle sensor or being obtained through a controller of the vehicle, and the like, which is not limited herein. In the following embodiments, the controller of the vehicle is taken as an example to be described.

[0048] It can be understood that the actual air pressure in the vacuum tank can be obtained first in the embodiments of the present application, so as to control the working of the vacuum pump in the subsequent steps. The system in which the vacuum tank is located can be, for example, Figure 2As shown, the system is composed of a controller, a vacuum pump, a vacuum tank, and an air pressure sensor. The vacuum pump provides power to extract air from the vacuum tank to form a vacuum. The vacuum tank is used to store the vacuum and provide vacuum assistance for the braking system. The controller collects the air pressure in the vacuum tank and the atmospheric pressure outside the vacuum tank, determines whether the vacuum is sufficient, and controls the start and stop of the vacuum pump.

[0049] In step S102, the vacuum pump is controlled according to the start and stop threshold of the vacuum pump and the actual air pressure, and the actual pumping time of the vacuum pump in one or more air pressure intervals is obtained.

[0050] In this embodiment, the actual pumping time of the vacuum pump can be obtained in at least one way, which is not limited in detail.

[0051] It can be understood that, in this embodiment, the vacuum pump can be controlled based on the start and stop threshold of the vacuum pump and the actual air pressure, and the actual pumping time of the vacuum pump in the corresponding air pressure interval during the operation of the vacuum pump can be obtained. In this embodiment, the controller controls the operation of the vacuum pump only when the tank air pressure is greater than P on , and stops the operation of the vacuum pump when the tank air pressure is less than P off . That is, the ability of the vacuum tank to provide assistance depends on the difference between the air pressure inside and outside the tank. Therefore, P on and P off are not fixed values. The controller adjusts the start and stop points P on and P off of the vacuum pump according to the change of the air pressure outside the tank. As the altitude increases and the atmospheric pressure decreases, the values of P on and P off will decrease to ensure sufficient assistance ability.

[0052] It should be noted that when the pressure sensor outside the tank fails and the controller cannot obtain the pressure value and cannot obtain the air pressure signal, the vacuum pump can still be controlled in this embodiment, as follows:

[0053] In this embodiment, before obtaining the actual pumping time of the vacuum pump in one or more air pressure intervals, it further includes: detecting whether the air pressure signal of the air pressure sensor outside the vacuum tank is lost; if the air pressure signal is lost, obtaining the cumulative driving distance of the vehicle; when the cumulative driving distance is greater than a preset driving distance, obtaining the actual pumping time of the vacuum pump in one or more air pressure intervals.

[0054] In this embodiment, the cumulative driving distance includes the driving distance obtained by restarting the accumulation or the driving distance obtained by accumulating from the moment when the air pressure signal is lost. The preset driving distance can be set according to the actual situation, and can be set to a certain range, such as 1 to 5 km, etc., which is not limited in detail.

[0055] It can be understood that, in this embodiment, the vacuum pump can be controlled based on the start and stop threshold of the vacuum pump and the actual air pressure, and the actual pumping time of the vacuum pump in the corresponding air pressure interval during the operation of the vacuum pump can be obtained. In this embodiment, the controller controls the operation of the vacuum pump only when the tank air pressure is greater than P on , and stops the operation of the vacuum pump when the tank air pressure is less than P off . That is, the ability of the vacuum tank to provide assistance depends on the difference between the air pressure inside and outside the tank. Therefore, P on and P off are not fixed values. The controller adjusts the start and stop points P on and P off of the vacuum pump according to the change of the air pressure outside the tank. As the altitude increases and the atmospheric pressure decreases, the values of P on and P off will decrease to ensure sufficient assistance ability.Figure 3 As shown, the embodiment of the present application can start the atmospheric pressure signal (hereinafter referred to as the air pressure signal) estimation function, the controller detects whether the air pressure signal is invalid, when detecting that the air pressure signal is not invalid, continue to return to the detection of the air pressure signal, ensure that the controller can obtain the air pressure signal in time and handle the exception in time; when detecting that the air pressure signal is invalid, the embodiment of the present application can use the atmospheric pressure value before the signal is invalid, and start to accumulate the vehicle mileage, when the mileage is greater than the preset driving mileage, immediately start the atmospheric pressure estimation function, and clear the accumulated mileage after ending, and re-accumulate until the air pressure signal is restored. Wherein, the atmospheric pressure estimation function of the embodiment of the present application is as follows:

[0056] In the embodiment of the present application, the vacuum pump is controlled to work according to the start-stop threshold value and the actual air pressure of the vacuum pump, including: obtaining the current start-stop threshold value of the vacuum pump, wherein the current start-stop threshold value is the start-stop threshold value determined according to the air pressure signal before the air pressure signal is lost, or the start-stop threshold value calculated according to the actual pumping time when the vacuum pump works last time; when the actual air pressure is greater than the start threshold value, control the vacuum pump to start working, until the actual air pressure is less than or equal to the stop threshold value, control the vacuum pump to stop working.

[0057] Specifically, the embodiment of the present application can use the controller to detect the air pressure value in the vacuum tank, wherein the start-stop threshold value can be set to 20kpa-80kpa; when detecting that the air pressure in the vacuum tank is greater than 80kpa, the application embodiment can start the vacuum pump and work stably at rated power, when detecting that the air pressure in the vacuum tank is less than 20kps, the embodiment of the present application can control the vacuum pump to stop working; and the embodiment of the present application can record the time of the change of the air pressure of the vacuum tank from P t1 to P t2 , P t2 to P t3 …P ty-1 to P ty after the vacuum pump stops working, respectively recorded as RT1 RT2 RT3…RT y-1 .

[0058] In step S103, the actual ambient air pressure outside the vacuum tank is calculated according to the actual pumping time of each air pressure interval and the corresponding reference pumping time, and the start-stop threshold value of the vacuum pump next time is determined based on the actual ambient air pressure.

[0059] Wherein, the reference pumping time can be obtained by at least one way, for example, the embodiment of the present application can use a way to query the database, which is not limited here; the way will be described in detail in the following embodiment, which will not be repeated here.

[0060] It can be understood that the embodiment of the present application can calculate the actual environment air pressure outside the vacuum tank, obtain the actual environment air pressure, and determine the start-stop threshold of the next work of the vacuum pump on this basis; wherein the calculation steps of the actual environment air pressure of the embodiment of the present application can be specifically as follows:

[0061] (1) Database establishment

[0062] In the embodiment of the present application, the reference pumping time of one or more pressure intervals under each environment air pressure is obtained, and further comprises: taking the pressure interval as an index, querying the pre-established database, and outputting the reference pumping time of each environment air pressure corresponding to the pressure interval, wherein the database stores the reference pumping time of multiple pressure intervals under each environment air pressure obtained by calibration.

[0063] It can be understood that the embodiment of the present application can query the reference pumping time corresponding to the output pressure interval under different environments through the database, wherein the steps of pre-establishing the database are specifically as follows:

[0064] The embodiment of the present application can test and record the working data of the vacuum system: (1) in the range of external atmospheric pressure 101kpa to 50kpa, interval-5kpa, select x external atmospheric pressure test points: P a1 P a2 P a3 …P ax ; (2) test the working time of the vacuum pump at each external atmospheric pressure test point; (3) in the range of vacuum tank internal air pressure 80kpa to 20kpa, interval-2kpa, select y vacuum tank internal air pressure test points: P t1 P t2 P t3 …P ty ; (4) the controller detects that the vacuum tank internal air pressure is P t1 , controls the vacuum pump to start working at rated power, and records the time of change of the vacuum tank internal air pressure from P t1 to P t2 , P t2 to P t3 …P ty-1 to P ty respectively; for example, when the external atmospheric pressure is P a1 , the time can be recorded as A1T1 A1T2 A1T3…A1T y-1 ; (5) all data records form a matrix and are stored in the controller; wherein the database storage data example diagram can be as shown in Figure 4 .

[0065] (2) Calculation of actual environment air pressure

[0066] In the embodiment of the present application, the actual ambient air pressure outside the vacuum tank is calculated according to the actual pumping time length of each air pressure interval and the corresponding reference pumping time length, comprising: obtaining the reference pumping time length of one or more air pressure intervals under each ambient air pressure; calculating the air pressure variance corresponding to each ambient air pressure according to the air pressure difference between the actual pumping time length and the corresponding reference pumping time length of all air pressure intervals; determining the ambient air pressure corresponding to the minimum air pressure variance as the actual ambient air pressure outside the vacuum tank.

[0067] It can be understood that the vacuum tank air pressure obtained in the above steps changes from P t1 to P t2 , P t2 to P t3 , …, P ty-1 to P ty , and the time taken is RT1, RT2, RT3, …, RT y-1 , which can be calculated with the vacuum pump pumping time recorded in the database under each atmospheric pressure, respectively. The atmospheric pressure corresponding to the minimum variance, i.e. the atmospheric pressure value predicted by the controller.

[0068] For example, when the external air pressure is P ax , the difference DT1 = RT1-A x T1, DT2 = RT2-A x T2, …, DT y-1 = RT y-1 -A x T y-1 is calculated for the corresponding time, and then the variance of DT1, DT2, …, DT y-1 is calculated, denoted as Q x . At this time, the atmospheric pressure corresponding to the minimum variance is the atmospheric pressure value predicted by the controller.

[0069] In the embodiment of the present application, after determining the start-stop threshold of the next working time of the vacuum pump based on the actual ambient air pressure, it further comprises: restarting the accumulation of the driving mileage of the vehicle until the air pressure signal is detected.

[0070] It can be understood that the embodiment of the present application can also restart the accumulation of the driving mileage of the vehicle after completing the above-mentioned confirmation of the start-stop threshold of the next working time of the vacuum pump, to ensure that the driving mileage of the vehicle is recorded before the next calculation, reduce the error caused by the driving mileage of the vehicle not being recorded in time, and enable the controller to timely control the vacuum pump, improve the intelligence of the scheme, and meet the actual use needs.

[0071] In summary, the vacuum pump control method according to the embodiment of the present application has at least the following advantages:

[0072] (1) The embodiment of the present application can control the vacuum pump based on the start-stop threshold of the vacuum pump and the actual air pressure, and calculate the actual ambient air pressure outside the vacuum tank and the start-stop threshold of the next operation of the vacuum pump based on the actual pumping time and the corresponding reference pumping time when the vacuum pump is working. Therefore, the embodiment of the present application can infer the atmospheric pressure outside the tank by the tank air pressure and the working state of the vacuum pump, and control the vacuum pump based on this, so that the vehicle also has good braking performance when the tank air pressure changes, improves the driving safety, improves the driving altitude environment, meets the actual use needs, and improves the user experience;

[0073] (2) The embodiment of the present application can calculate the variance of the pumping time and the corresponding reference pumping time in the air pressure interval to determine the actual ambient air pressure value outside the vacuum tank. Therefore, the embodiment of the present application can obtain the real-time ambient air pressure value outside the tank in time, so that the controller can control the vacuum pump in time, improve the driving safety, and meet the actual use needs;

[0074] (3) The embodiment of the present application can query the reference value of the pumping time in the corresponding air pressure interval through the database to provide a data basis for the calculation of the actual ambient air pressure;

[0075] (4) The embodiment of the present application can obtain the driving mileage and the actual pumping time of the vehicle after detecting the loss of the air pressure signal, and provide a data basis for the calculation of the actual ambient air pressure after the air pressure signal fails, so as to realize the corresponding control of the vacuum pump;

[0076] (5) The embodiment of the present application can restart the accumulation of the vehicle driving mileage after confirming the start-stop threshold of the next operation time of the vacuum pump, ensure that the vehicle driving mileage is recorded before the next calculation, reduce the error caused by the vehicle driving mileage not being recorded in time, so that the controller can control the vacuum pump in time, improve the intelligence of the scheme, and meet the actual use needs;

[0077] (6) The embodiment of the present application can compare the vacuum pump start threshold and the actual air pressure to determine whether to start the vacuum pump, avoid unnecessary loss of the vacuum pump working continuously, improve the service life of the vacuum pump, and meet the actual use needs.

[0078] Secondly, the vacuum pump control device according to the embodiment of the present application is described with reference to the accompanying drawings.

[0079] Figure 5 is a block schematic diagram of the vacuum pump control device of the embodiment of the present application.

[0080] As shown in Figure 5 , the vacuum pump control device 10 comprises an acquisition module 100, a control module 200 and a calculation module 300.

[0081] The control module 200 is configured to control the vacuum pump to work according to the start-stop threshold of the vacuum pump and the actual air pressure, and to acquire the actual air pumping duration of the vacuum pump in one or more air pressure intervals; and the calculation module 300 is configured to calculate the actual ambient air pressure outside the vacuum tank according to the actual air pumping duration of each air pressure interval and the corresponding reference air pumping duration, and to determine the start-stop threshold of the vacuum pump at the next working time based on the actual ambient air pressure.

[0082] In the embodiment of the present application, the calculation module 300 is further configured to acquire the reference air pumping duration of one or more air pressure intervals under each ambient air pressure, to calculate the corresponding air pressure variance of each ambient air pressure according to the air pressure difference between the actual air pumping duration and the corresponding reference air pumping duration of all air pressure intervals, and to determine the ambient air pressure corresponding to the minimum air pressure variance as the actual ambient air pressure outside the vacuum tank.

[0083] In the embodiment of the present application, the calculation module 300 is further configured to index the air pressure intervals, to query a pre-established database, and to output the reference air pumping duration under each ambient air pressure corresponding to the air pressure intervals, wherein the database stores the reference air pumping duration of multiple air pressure intervals under each ambient air pressure obtained by calibration.

[0084] In the embodiment of the present application, the control module 200 is further configured to detect whether the air pressure signal of the air pressure sensor outside the vacuum tank is lost, to acquire the cumulative driving mileage of the vehicle if the air pressure signal is lost, and to acquire the actual air pumping duration of the vacuum pump in one or more air pressure intervals when the cumulative driving mileage is greater than a preset driving mileage.

[0085] In the embodiment of the present application, the calculation module is further configured to restart the cumulative driving mileage of the vehicle until the air pressure signal is detected.

[0086] In the embodiment of the present application, the cumulative driving mileage includes the driving mileage obtained by restarting the cumulative driving mileage or the driving mileage obtained by accumulating from the moment when the air pressure signal is lost.

[0087] In the embodiment of the present application, the control module 200 is further configured to acquire the current start-stop threshold of the vacuum pump, wherein the current start-stop threshold is the start-stop threshold determined according to the air pressure signal before the air pressure signal is lost, or the start-stop threshold calculated according to the actual air pumping duration of the vacuum pump at the last working time, to control the vacuum pump to start working when the actual air pressure is greater than the start threshold, and to control the vacuum pump to stop working when the actual air pressure is less than or equal to the stop threshold.

[0088] It should be noted that the foregoing explanation and description of the vacuum pump control method embodiment are also applicable to the vacuum pump control device of the embodiment, which will not be described here again.

[0089] According to the vacuum pump control device provided by the embodiment of the present application, the atmospheric pressure outside the tank can be inferred from the gas pressure in the tank and the working state of the vacuum pump, and the vacuum pump is controlled based on the atmospheric pressure, so that the vehicle has good braking performance when the atmospheric pressure outside the tank changes, the driving safety is improved, the driving altitude environment is improved, the actual use needs are met, and the user experience is improved.

[0090] Figure 6 The vehicle can include:

[0091] The memory 601, the processor 602, and the computer program stored in the memory 601 and executable on the processor 602.

[0092] The processor 602 implements the vacuum pump control method provided in the above embodiments when executing the program.

[0093] Further, the vehicle further includes:

[0094] The communication interface 603 is used for communication between the memory 601 and the processor 602.

[0095] The memory 601 is used to store the computer program executable on the processor 602.

[0096] The memory 601 can include a high-speed RAM (Random Access Memory) memory, and can also include a non-volatile memory, such as at least one disk memory.

[0097] If the memory 601, the processor 602, and the communication interface 603 are independently implemented, the communication interface 603, the memory 601, and the processor 602 can be connected to each other through a bus and complete communication between each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, Figure 6 Only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0098] Optionally, in a specific implementation, if the memory 601, the processor 602, and the communication interface 603 are integrated on a chip, the memory 601, the processor 602, and the communication interface 603 can complete communication between each other through an internal interface.

[0099] The processor 602 can be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to perform the operations of an embodiment of the application.

[0100] The embodiment of the application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the vacuum pump control method.

[0101] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or N embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0102] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "N" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0103] Any process or method descriptions in flow charts or otherwise described herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for performing a specified logic function or process, and the various embodiments of the application contemplate that the modules, segments, or portions of code may be implemented in hardware, software, or a combination of both. The various embodiments of the application contemplate that the order in which the functions are described can be changed, and that additional functions can be added or replaced, as appropriate, without departing from the scope of the application.

[0104] It should be understood that portions of the present application can be implemented with hardware, software, firmware or a combination thereof. In the above embodiments, the N steps or methods can be implemented with software or firmware stored in memory and executed by a suitable instruction execution system. As such, if implemented in hardware, and in another embodiment, any of the following technologies, known in the art, or their combinations can be used to implement: discrete logic circuitry having logic gates for implementing logic functions on data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays, field programmable gate arrays, etc.

[0105] Those skilled in the art of the present technology can understand that all or part of the steps carried out by the above-mentioned embodiment method can be completed by a program instructing the relevant hardware, and the program can be stored in a computer readable storage medium. When the program is executed, it includes one of the steps of the method embodiment or a combination thereof.

[0106] Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A vacuum pump control method, characterized by, The method comprises the following steps: acquiring an actual air pressure in a vacuum tank; controlling the vacuum pump to work according to a start-stop threshold of the vacuum pump and the actual air pressure, and acquiring actual air pumping time lengths of the vacuum pump in multiple air pressure intervals; calculating an actual ambient air pressure outside the vacuum tank according to the actual air pumping time length of each air pressure interval and a corresponding reference air pumping time length, and determining the start-stop threshold of the vacuum pump at the next working time based on the actual ambient air pressure; the calculation of the actual ambient air pressure outside the vacuum tank according to the actual air pumping time length of each air pressure interval and the corresponding reference air pumping time length comprises: acquiring reference air pumping time lengths of the multiple air pressure intervals under each ambient air pressure; calculating a pressure variance corresponding to each ambient air pressure according to a pressure difference between the actual air pumping time length and the corresponding reference air pumping time length of all air pressure intervals; determining an ambient air pressure corresponding to a minimum pressure variance as the actual ambient air pressure outside the vacuum tank.

2. The vacuum pump control method according to claim 1, characterized in that, the acquisition of the reference air pumping time lengths of the multiple air pressure intervals under each ambient air pressure further comprises: indexing the air pressure intervals, querying a pre-established database, and outputting the reference air pumping time lengths of each ambient air pressure corresponding to the air pressure intervals, wherein the database stores the reference air pumping time lengths of the multiple air pressure intervals under each ambient air pressure obtained through calibration.

3. The vacuum pump control method according to claim 1, characterized in that, before the acquisition of the actual air pumping time lengths of the vacuum pump in the multiple air pressure intervals, the method further comprises: detecting whether the air pressure signal of the ambient air pressure sensor outside the vacuum tank is lost; if the air pressure signal is lost, acquiring a cumulative driving mileage of a vehicle; when the cumulative driving mileage is greater than a preset driving mileage, acquiring the actual air pumping time lengths of the vacuum pump in the multiple air pressure intervals.

4. The vacuum pump control method according to claim 3, characterized in that, after the determination of the start-stop threshold of the vacuum pump at the next working time based on the actual ambient air pressure, the method further comprises: resuming the accumulation of the driving mileage of the vehicle until the air pressure signal is detected.

5. The vacuum pump control method according to claim 3, characterized in that, the cumulative driving mileage comprises a driving mileage obtained by resuming the accumulation or a driving mileage obtained by accumulating from the time when the air pressure signal is lost.

6. The vacuum pump control method according to claim 1, characterized by, the control of the vacuum pump to work according to the start-stop threshold of the vacuum pump and the actual air pressure comprises: acquiring a current start-stop threshold of the vacuum pump, wherein the current start-stop threshold is a start-stop threshold determined according to the air pressure signal before the air pressure signal is lost, or a start-stop threshold calculated according to the actual air pumping time length of the vacuum pump at the last working time; when the actual air pressure is greater than a start threshold, controlling the vacuum pump to start working, and when the actual air pressure is less than or equal to a stop threshold, controlling the vacuum pump to stop working.

7. A vacuum pump control device, characterized by, a device for implementing the vacuum pump control method according to any one of claims 1-6, comprising: an acquisition module configured to acquire an actual air pressure in a vacuum tank; a control module configured to control the vacuum pump to work according to a start-stop threshold of the vacuum pump and the actual air pressure, and acquire actual air pumping time lengths of the vacuum pump in multiple air pressure intervals; a calculation module configured to calculate an actual ambient air pressure outside the vacuum tank according to the actual air pumping time length of each air pressure interval and a corresponding reference air pumping time length, and determine the start-stop threshold of the vacuum pump at the next working time based on the actual ambient air pressure.

8. A vehicle characterized by comprising: comprise: - a memory, a processor, and a computer program stored on the memory and runable on the processor, the processor executing the program to implement the vacuum pump control method according to any one of claims 1-6.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The program is executed by a processor for implementing the vacuum pump control method according to any one of claims 1-6.

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