Control method of vehicle vacuum pump, vehicle and computer readable storage medium

Abstract

The application relates to the technical field of vehicles and discloses a control method of a vehicle vacuum pump, a vehicle and a computer readable storage medium. The method comprises the following steps: acquiring the pressure in a vacuum tank when the vacuum pump is working; when the vacuum pump works for a preset maximum working time or the change rate of the pressure is less than a preset value and the pressure in the vacuum tank is less than a current closing pressure, controlling the vacuum pump to stop working; updating the current closing pressure according to the maximum pressure in the vacuum tank when the vacuum pump is working and a preset relationship; and the preset relationship comprises the relationship between the maximum pressure in the vacuum tank and the closing pressure when the vacuum pump works at different altitudes. In conclusion, even if the pressure in the vacuum tank does not reach the current closing pressure, the vacuum pump can be controlled to be closed, and the current closing pressure can be updated. Therefore, the service life attenuation and cost of the vacuum pump can be reduced, and the actual demand for the vacuum pump closing time can be met.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to a control method for a vehicle vacuum pump, a vehicle, and a computer-readable storage medium. Background Technology

[0002] Vacuum pumps are one solution for addressing the braking assist problem in electric vehicles. Generally, the start-stop control of vacuum pumps is based on a control strategy incorporating atmospheric pressure sensors. This sensor-based vacuum pump control is simple and effective, but its drawback is the high cost of atmospheric pressure sensors.

[0003] Currently, in applications where atmospheric pressure sensors are omitted, changes in altitude prevent the vacuum pump from reaching a sufficiently high pressure in the vacuum tank for extended periods of operation. This results in prolonged operating time for the vacuum pump, accelerating its lifespan and increasing maintenance costs. Summary of the Invention

[0004] In view of the above problems, embodiments of this application provide a control method for a vehicle vacuum pump, a vehicle, and a computer-readable storage medium, which can reduce the lifespan and cost of the vacuum pump and meet the actual requirements for the vacuum pump shutdown time.

[0005] The first aspect of this application provides a control method for a vehicle vacuum pump, wherein the vacuum pump is connected to a vacuum tank and is used to extract air from the vacuum tank when the vacuum pump is working. The method includes: acquiring the pressure inside the vacuum tank when the vacuum pump is working; controlling the vacuum pump to stop working after the vacuum pump has been working for a preset maximum time or the rate of change of pressure is less than a preset value and the pressure inside the vacuum tank is less than the current shut-off pressure; updating the current shut-off pressure according to the maximum pressure inside the vacuum tank when the vacuum pump is working and a preset relationship; wherein the preset relationship includes the relationship between the maximum pressure inside the vacuum tank and the shut-off pressure when the vacuum pump is working at different altitudes.

[0006] In some specific embodiments, after the step of updating the current shut-off pressure based on the maximum pressure inside the vacuum tank when the vacuum pump is working and a preset relationship, the method further includes: obtaining the vehicle's operating status; obtaining the vehicle's altitude change when the vehicle is in motion, updating the vehicle's current altitude based on the altitude change; and updating the current shut-off pressure at the current altitude based on the current altitude and a preset relationship.

[0007] In some specific embodiments, after updating the current closed pressure at the current altitude based on the current altitude and a preset relationship, the process includes: when the pressure inside the vacuum tank is less than the current open pressure, controlling the vacuum pump to work and acquiring the pressure change inside the vacuum tank; when the pressure change is less than a preset amount and the remaining working time of the vacuum tank is less than a preset time, updating the vehicle's current altitude; wherein the preset amount is less than or equal to 0.

[0008] In some specific embodiments, after updating the vehicle's current altitude when the pressure change is less than a preset amount and the remaining working time of the vacuum tank is less than a preset time, the method further includes: controlling the vacuum pump to stop working after the current working time of the vacuum pump reaches a preset maximum working time; controlling the vacuum pump to start working after a preset interval after the vacuum pump stops working; controlling the vacuum pump to stop working after the vacuum pump has worked for a preset maximum working time or the rate of pressure change is less than a preset value and the pressure inside the vacuum tank is less than the current closing pressure; and updating the current closing pressure based on the current altitude.

[0009] In some specific embodiments, the step of acquiring the vehicle's altitude change while the vehicle is in motion and updating the vehicle's current altitude based on the altitude change includes: acquiring the vehicle's driving slope and speed within a single sampling time period; acquiring a single altitude change of the vehicle within a single sampling time period based on the driving slope and speed; and acquiring the vehicle's altitude change based on all single altitude changes.

[0010] In some specific embodiments, after the step of controlling the vacuum pump to stop working when the vacuum pump has been working for a preset maximum working time or the rate of change of pressure is less than a preset value and the pressure in the vacuum tank is less than the current shut-off pressure, the method further includes: updating the current opening pressure based on the maximum pressure in the vacuum tank when the vacuum pump is working and a preset relationship; wherein, the preset relationship includes the relationship between the maximum pressure in the vacuum tank when the vacuum pump is working at different altitudes and the opening pressure of the vacuum pump.

[0011] In some specific embodiments, the step of updating the current opening pressure based on the maximum pressure inside the vacuum tank when the vacuum pump is working and a preset relationship includes: reducing the value of the current opening pressure when the maximum pressure is less than or equal to the current closing pressure; and maintaining the value of the current opening pressure when the maximum pressure is greater than or equal to the current closing pressure.

[0012] In some specific embodiments, before the step of obtaining the pressure inside the vacuum tank when the vacuum pump is working, the method further includes: monitoring the pressure inside the vacuum tank; and when the pressure inside the vacuum tank is lower than the current start pressure, controlling the vacuum pump to work to increase the pressure inside the vacuum tank.

[0013] In some specific embodiments, after the step of controlling the vacuum pump to increase the pressure inside the vacuum tank when the pressure inside the vacuum tank is lower than the current start pressure, the method further includes: obtaining the working time of the vacuum pump and the pressure change in the vacuum tank; and obtaining the rate of change of pressure inside the vacuum tank based on the pressure change.

[0014] In some specific embodiments, after the step of obtaining the pressure inside the vacuum tank when the vacuum pump is working, the method further includes: controlling the vacuum pump to stop working when the pressure inside the vacuum tank is greater than or equal to the current shutdown pressure.

[0015] A second aspect of this application provides a vehicle including a processor and a memory, the processor being connected to the memory, the memory being used to store at least one executable instruction that causes the processor to perform a vacuum pump control method as described above.

[0016] A third aspect of this application provides a computer-readable storage medium storing at least one executable instruction that, when executed on a vehicle, causes the vehicle to perform the vehicle vacuum pump control method as described above.

[0017] This application provides at least the following beneficial effects: Based on the vehicle vacuum pump control method, vehicle, and computer-readable storage medium provided in this application, the vacuum pump is connected to a vacuum tank. When the vacuum pump operates, it is used to extract air from the vacuum tank. The method includes: acquiring the pressure inside the vacuum tank when the vacuum pump is operating; controlling the vacuum pump to stop operating after a preset maximum operating time or when the rate of change of pressure is less than a preset value, and the pressure inside the vacuum tank is less than the current shut-off pressure; updating the current shut-off pressure based on the maximum pressure inside the vacuum tank when the vacuum pump is operating and a preset relationship; wherein, the preset relationship includes the relationship between the maximum pressure inside the vacuum tank and the shut-off pressure when the vacuum pump is operating at different altitudes. Therefore, even if the pressure inside the vacuum tank does not reach the current shut-off pressure, the vacuum pump can be controlled to shut down after the preset maximum operating time or when the rate of change of pressure is less than the preset value. Furthermore, the current shut-off pressure can be updated to meet the actual requirements for the vacuum pump's shut-off time. Therefore, it can reduce the lifespan degradation and cost of the vacuum pump and meet the actual requirements for the vacuum pump's shut-off time.

[0018] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic flowchart of an embodiment of the vehicle vacuum pump control method provided in this application;

[0021] Figure 2This is a schematic flowchart of another embodiment of the vehicle vacuum pump control method provided in this application;

[0022] Figure 3 This is a flowchart illustrating another embodiment of the vehicle vacuum pump control method provided in this application;

[0023] Figure 4 This is a flowchart illustrating another embodiment of the vehicle vacuum pump control method provided in this application;

[0024] Figure 5 This is a flowchart illustrating another embodiment of the vehicle vacuum pump control method provided in this application;

[0025] Figure 6 This is a schematic diagram of one embodiment for obtaining altitude change.

[0026] Figure 7 This is a flowchart illustrating another embodiment of the vehicle vacuum pump control method provided in this application;

[0027] Figure 8 This is a flowchart illustrating another embodiment of the vehicle vacuum pump control method provided in this application;

[0028] Figure 9 This is a schematic diagram of the structural frame of an embodiment of the vehicle provided in this application;

[0029] Figure 10 This is a schematic diagram of the structural framework of an embodiment of the computer-readable storage medium provided in this application.

[0030] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0032] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0034] The first aspect of this application provides a control method for a vehicle vacuum pump, which controls the operating state of the vacuum pump in a vehicle. It should be understood that the vehicle equipped with the vacuum pump is an electrically driven vehicle, and the vehicle is equipped with a vacuum tank. The vacuum pump is connected to the vacuum tank, and when the vacuum pump operates, it extracts air from the vacuum tank to increase the pressure inside the vacuum tank, thereby achieving auxiliary braking of the vehicle through the vacuum tank.

[0035] Figure 1 This is a flowchart illustrating an embodiment of the vehicle vacuum pump control method provided in this application.

[0036] Combination Figure 1 This method includes the following steps:

[0037] S11: Obtain the pressure inside the vacuum tank when the vacuum pump is working.

[0038] When the vehicle brakes, the pressure inside the vacuum tank decreases. When the pressure inside the vacuum tank drops to a certain level, the vacuum pump starts to work and extracts air from the vacuum tank, causing the pressure inside the vacuum tank to rise. This ensures that the pressure inside the vacuum tank meets the requirements of subsequent auxiliary braking.

[0039] Specifically, a pressure sensor can be installed inside the vacuum tank to obtain pressure information within the tank, thereby determining the pressure magnitude. This step allows for real-time pressure monitoring within the vacuum tank, providing an understanding of the pressure level throughout the entire operation of the vacuum pump.

[0040] S12: When the vacuum pump has been operating for the preset maximum operating time or the rate of change of pressure is less than the preset value, and the pressure inside the vacuum tank is less than the current shut-off pressure, control the vacuum pump to stop operating.

[0041] The preset maximum working time of the vacuum pump is set according to factors such as the performance of the vacuum pump and the corresponding requirements of the vacuum tank. This ensures that the vacuum pump can meet the pressure rise requirements of the vacuum tank without working for more than the preset maximum working time, and also prevents the vacuum pump from experiencing a lifespan reduction due to excessive working time.

[0042] To stop the vacuum pump from operating, a current shut-off pressure is set. This means that if the pressure inside the vacuum tank reaches this pressure during operation, the pump will stop. In this case, the pump's operating time generally will not exceed the maximum operating time. However, when a vehicle moves from a lower altitude to a higher altitude, the ambient pressure decreases. Even if the vacuum pump operates for longer than the preset maximum time, the pressure inside the vacuum tank may not reach the current shut-off pressure, causing the pump to remain operational and thus affecting its lifespan.

[0043] In this step, if the pressure inside the vacuum tank is lower than the current shut-off pressure after the vacuum pump has operated for the preset maximum time (potentially due to high altitude), it indicates that the vehicle's environment is affecting the pressure rise inside the vacuum tank. At this point, further extraction of air from the vacuum tank will not increase the pressure, and the vacuum pump needs to be stopped to prevent prolonged operation and potential impact on its lifespan. If the rate of pressure change inside the vacuum tank is less than the preset value while the vacuum pump is operating, it means the pressure rise is very slow, and even continued operation cannot significantly increase the pressure. In this case, the vacuum pump should be stopped.

[0044] Therefore, based on this step, the vacuum pump can be controlled to stop working according to the actual working effect of the vacuum pump or the preset maximum working time, thereby avoiding the vacuum pump from doing useless work and causing the working time to exceed the preset maximum working time.

[0045] S13: Update the current shut-off pressure based on the maximum pressure inside the vacuum tank when the vacuum pump is working and the preset relationship; wherein, the preset relationship includes the relationship between the maximum pressure inside the vacuum tank and the shut-off pressure when the vacuum pump is working at different altitudes.

[0046] During vacuum pump operation, the pressure inside the vacuum tank can be acquired in real time. Therefore, after the vacuum pump finishes operating, the maximum pressure inside the vacuum tank during operation can be determined based on all the acquired data. Combining the above, the maximum pressure inside the vacuum tank is less than the current shut-off pressure.

[0047] Preset relationships are obtained and stored in advance. When obtaining these relationships, the vacuum pump is controlled to operate at different altitudes to extract air from the vacuum tank, and the maximum pressure achievable in the vacuum tank within the preset maximum operating time of the vacuum pump is obtained. A shut-off pressure is then set based on the maximum pressure and related factors. The shut-off pressure is less than or equal to the maximum pressure, ensuring that the vacuum pump stops operating when the pressure inside the vacuum tank reaches the shut-off pressure at that altitude. At different altitudes, the maximum pressure and shut-off pressure of the vacuum tank are generally different, and the maximum pressure typically decreases with increasing altitude, correspondingly reducing the shut-off pressure.

[0048] In some specific embodiments, the maximum pressure and shut-off pressure of the vacuum tank corresponding to different altitude ranges can be obtained. For example, if the altitude difference between each altitude range is 100 meters, the maximum pressure and corresponding shut-off pressure of the vacuum tank within that altitude range are the same. Of course, the altitude difference between altitude ranges is not limited to 100 meters and can be set according to the specific application scenario and actual needs.

[0049] In some more specific embodiments, a preset altitude is set. When the altitude within a first altitude range is less than or equal to the preset altitude, there is no issue of the pressure inside the vacuum tank not reaching the shut-off pressure. In this case, it is not necessary to obtain the maximum pressure corresponding to the altitude within the first altitude range; the shut-off pressure corresponding to the altitude within the first altitude range is the shut-off pressure corresponding to the preset altitude. The preset altitude can be the altitude corresponding to standard atmospheric pressure. When the altitude is greater than the preset altitude, the maximum achievable pressure within different altitude ranges is obtained experimentally, and the corresponding shut-off pressure is set.

[0050] In this step, after obtaining the maximum pressure inside the vacuum tank, the corresponding closing pressure can be found based on the preset relationship. Then, the closing pressure corresponding to the maximum pressure is used as the current closing pressure, thereby updating the current closing pressure.

[0051] It should be understood that during vacuum pump operation, if the maximum pressure achievable by the vacuum tank is lower than the current shut-off pressure, it indicates that the vehicle is at a high altitude. In this case, the vacuum pump cannot be effectively controlled based on the maximum pressure at a lower altitude. This step updates the current shut-off pressure after the vacuum pump is shut down. If the vehicle is traveling at that altitude, the current shut-off pressure will provide good control over the vacuum pump, preventing prolonged operation and extending its lifespan. If the vehicle is traveling to a lower altitude, the updated current shut-off pressure will also provide good control, preventing excessive operation. If the vehicle is traveling to a higher altitude, the vacuum tank pressure may not reach the updated current shut-off pressure, requiring further updates to the current shut-off pressure.

[0052] In summary, the vehicle vacuum pump control method provided in the above embodiments: When the vacuum pump is operating, the pressure inside the vacuum tank is acquired; after the vacuum pump has operated for a preset maximum time or the rate of change of pressure is less than a preset value, and the pressure inside the vacuum tank is less than the current shut-off pressure, the vacuum pump is controlled to stop operating; the current shut-off pressure is updated based on the maximum pressure inside the vacuum tank when the vacuum pump is operating and a preset relationship; wherein, the preset relationship includes the relationship between the maximum pressure inside the vacuum tank and the shut-off pressure when the vacuum pump is operating at different altitudes. Therefore, even if the pressure inside the vacuum tank has not reached the current shut-off pressure, the vacuum pump can still be controlled to shut down after the preset maximum operating time or when the rate of change of pressure is less than the preset value, which can reduce the lifespan degradation and cost of the vacuum pump. Furthermore, the current shut-off pressure can be updated to meet the actual requirements for the vacuum pump shut-off time.

[0053] Figure 2 This is a schematic flowchart of another embodiment of the vehicle vacuum pump control method provided in this application. (In conjunction with...) Figure 2 In some specific embodiments, after updating the current shut-off pressure based on the maximum pressure inside the vacuum tank when the vacuum pump is operating and a preset relationship, i.e. after step S13 above, the following is also included:

[0054] S14: Obtain the vehicle's operating status.

[0055] Based on the above, after updating the current pressure, the vehicle may be in a stopped state or in a moving state. In this case, the vehicle's operating status can be determined by obtaining its speed. When the speed is 0, the vehicle is considered stopped; when the speed is greater than 0, the vehicle is considered moving.

[0056] S15: Obtain the vehicle's altitude change while the vehicle is in motion, and update the vehicle's current altitude based on the altitude change.

[0057] When a vehicle is in motion, its altitude may change. For example, the vehicle's altitude may rise or fall while going up or down a slope, while the vehicle's altitude remains constant when traveling on flat ground.

[0058] In this embodiment, the vehicle's altitude change can be obtained through various methods, and the specific method is not limited. In some specific embodiments, the vehicle's altitude change can be obtained at preset time intervals. For example, the vehicle's first altitude is obtained at a first moment, the current moment is the second moment, and a specific altitude change is obtained at the second moment. Then, the altitude at the second moment can be obtained based on the first altitude and the specific altitude change, and the altitude at the second moment can be used as the vehicle's current altitude to update the vehicle's current altitude.

[0059] S16: Update the current closed pressure at the current altitude based on the current altitude and preset relationships.

[0060] After the current altitude is updated, the current closing pressure of the vehicle at the current altitude will also change. At this time, the closing pressure corresponding to the current altitude is found based on the preset relationship, and the corresponding closing pressure is used as the current closing pressure at the current altitude, thereby updating the current closing pressure at the current altitude.

[0061] At this time, although the vehicle's altitude changes, the vacuum pump can be shut down within its maximum working time because it can update the current shut-off pressure corresponding to the current altitude. This prevents the vacuum pump from working for too long and affecting its lifespan.

[0062] In summary, based on this embodiment, it is possible to obtain the vehicle's altitude change during operation, thereby updating the vehicle's current altitude, and then updating the current shut-off pressure based on the updated current altitude, thus meeting the actual requirements for vacuum pump shut-off time at different altitudes.

[0063] Figure 3 This is a schematic flowchart of another embodiment of the vehicle vacuum pump control method provided in this application. (In conjunction with...) Figure 3 In some specific embodiments, after the step of updating the current shut-off pressure at the current altitude based on the current altitude and a preset relationship, i.e., after step S16 above, the following is also included:

[0064] S21: When the pressure inside the vacuum tank is lower than the current opening pressure, control the vacuum pump to work and obtain the pressure change inside the vacuum tank.

[0065] In conjunction with the above embodiments, when the pressure inside the vacuum tank drops to a certain level, the vacuum pump will be activated. At this time, a current activation pressure is set; when the pressure inside the vacuum tank is lower than the current activation pressure, the vacuum pump will be activated.

[0066] It should be understood that the current opening pressure may vary with altitude. Therefore, there is a unique and specific current opening pressure for each altitude range.

[0067] S22: When the pressure change is less than the preset amount and the remaining working time of the vacuum tank is less than the preset time, update the vehicle's current altitude; where the preset amount is less than or equal to 0.

[0068] The preset amount and preset time can be set according to a specific use case and actual needs, without specific limitations. Since the preset amount is less than or equal to 0, when the pressure change is less than the preset amount, it means that the pressure inside the vacuum tank remains unchanged or decreases to some extent. In this case, it is highly likely that the vehicle braked during the operation of the vacuum pump, resulting in a significant decrease in the pressure inside the vacuum tank, and even the operation of the vacuum pump did not increase the pressure inside the vacuum tank.

[0069] If the remaining operating time of the vacuum tank is less than the preset time, it indicates that the vacuum pump cannot raise the pressure of the vacuum tank to a high level during its current operation. In this case, the maximum achievable pressure of the vacuum tank cannot be obtained within the current operating time of the vacuum pump. Therefore, the current shut-off pressure is not updated at this time; only the current altitude is obtained.

[0070] Figure 4 This is a schematic flowchart of another embodiment of the vehicle vacuum pump control method provided in this application. (In conjunction with...) Figure 4 In some specific embodiments, after updating the vehicle's current altitude when the pressure change is less than a preset amount and the remaining working time of the vacuum tank is less than a preset time, i.e. after step S22 above, the method further includes:

[0071] S31: Control the vacuum pump to stop working after the current working time of the vacuum pump reaches the preset maximum working time.

[0072] Based on the above, during the vehicle's braking operation during the current operation of the vacuum pump, the pressure inside the vacuum tank decreased. Even if the vacuum pump's operating time during this operation was greater than or equal to the preset maximum operating time, the remaining time was too short to allow the pressure inside the vacuum tank to reach the current shut-off pressure. If the vacuum pump were to continue operating at this time, the prolonged operating time would affect its lifespan; therefore, the vacuum pump was stopped.

[0073] S32: Controls the vacuum pump to start working after a preset interval after the vacuum pump stops working.

[0074] After a vacuum pump stops working, it needs to wait a certain amount of time before it can be restarted, allowing it to rest. The preset interval can be set according to the required rest period of the vacuum pump, the current environmental conditions, and other factors to meet actual needs; no specific limitations are imposed here.

[0075] S33: When the vacuum pump has been operating for the preset maximum operating time or the rate of change of pressure is less than the preset value, and the pressure inside the vacuum tank is less than the current shut-off pressure, control the vacuum pump to stop operating.

[0076] Based on the above, the likelihood of the vehicle braking during this current operation is very low. Therefore, the vacuum pump, operating normally, can adequately increase the pressure within the vacuum tank. Thus, the decision to continue operating the vacuum pump can be made by considering its operating time, the rate of pressure change within the vacuum tank, and its relationship to the current shut-off pressure.

[0077] If the vacuum pump operates for the preset maximum working time or the rate of pressure change is less than the preset value, and the pressure inside the vacuum tank is less than the current shut-off pressure, it indicates that the vehicle's altitude has increased. At this point, the current shut-off pressure cannot be reached, and the vacuum pump will stop working.

[0078] S34: Update the current shut-off pressure based on the current altitude.

[0079] At this point, the current closing pressure is obtained based on the previously updated current altitude and preset relationships, thereby meeting the actual needs at the current altitude.

[0080] Figure 5 This is a schematic flowchart of another embodiment of the vehicle vacuum pump control method provided in this application. Figure 6 This is a schematic diagram of one embodiment for obtaining altitude change.

[0081] Combination Figure 5 as well as Figure 6 In some specific embodiments, the step of acquiring the vehicle's altitude change while the vehicle is in motion and updating the vehicle's current altitude based on the altitude change, i.e., step S15 above, includes:

[0082] S151: Obtain the vehicle's driving gradient and speed within a single sampling time period.

[0083] The vehicle's gradient and speed can be acquired at specific time intervals. For example, the vehicle's gradient and speed can be acquired at a first moment, a second moment, and a third moment. The time interval between the first and second moments can be equal to the time interval between the second and third moments; however, in some embodiments, they may not be equal. Figure 6 The specific time interval can be t, and the time interval between adjacent acquisition times is also t.

[0084] S152: Obtain the single altitude change of a vehicle within a single sampling time period based on driving slope and vehicle speed.

[0085] Based on the above, a time interval is defined as a sampling period. Within a sampling period, the driving gradient and vehicle speed are obtained. Then, by using the duration of the sampling period and the vehicle speed, the distance traveled by the vehicle can be calculated. Furthermore, based on the driving gradient, the change in altitude of the vehicle within a single sampling period can be obtained.

[0086] S153: Obtain the vehicle's altitude change based on all individual altitude changes.

[0087] The vehicle's gradient and speed are sampled at the start of its journey. The set of individual elevation changes within all individual sampling time periods is the vehicle's elevation change during its journey.

[0088] Specific combination Figure 6 In some application scenarios, △h=(v t0 ·sinβ0+v t1 ·sinβ1+…+v tn ·sinβn)·dt,i n v tn Let dt be the slope and vehicle speed at the nth sampling time, and dt be the sampling interval, i.e., the single sampling time period mentioned above.

[0089] It should be understood that, Figure 6 The system will display the vehicle as climbing during each sampling period, but it is not limited to this. For example, the vehicle may climb during the current sampling period and descend during the next sampling period.

[0090] Based on the above, this embodiment obtains the total altitude change of the vehicle during driving by continuously sampling and acquiring the altitude change within a single sampling time period. This effectively obtains the altitude change of the vehicle.

[0091] In some specific embodiments, after the step of controlling the vacuum pump to stop working when the vacuum pump has been operating for a preset maximum working time or the rate of change of pressure is less than a preset value, and the maximum pressure inside the vacuum tank is less than the current shut-off pressure, i.e. after step S12 above, the method further includes:

[0092] The current start pressure is updated based on the maximum pressure inside the vacuum tank when the vacuum pump is working and a preset relationship; the preset relationship includes the relationship between the maximum pressure inside the vacuum tank when the vacuum pump is working and the start pressure of the vacuum pump at different altitudes.

[0093] It should be understood that when obtaining the preset relationship, after obtaining the vacuum pump's shut-off pressure at a specific altitude, the vacuum pump's open-end pressure can also be obtained. The open-end pressure can be set according to the shut-off pressure and actual needs, and the open-end pressure is less than the shut-off pressure. In this case, if the open-end pressure corresponding to the maximum pressure is different from the current open-end pressure, then the current open-end pressure will be updated.

[0094] More specifically, the step of updating the current opening pressure based on the maximum pressure inside the vacuum tank when the vacuum pump is working and a preset relationship includes: reducing the value of the current opening pressure when the maximum pressure is less than the current closing pressure.

[0095] It should be understood that when the maximum pressure is less than or equal to the current shut-off pressure, it means that the vehicle is at a high altitude. At this time, the updated current shut-off pressure is lower than before the update. Therefore, the current opening pressure is reduced so that the vacuum pump is activated only when the pressure inside the vacuum tank is lower, thus adapting to actual needs.

[0096] In the embodiment of updating the current closed pressure at the current altitude based on the current altitude and preset relationship, the updated current closed pressure may be higher or lower. When the altitude increases, the current open pressure may decrease, and when the altitude decreases (at which point the altitude is greater than the altitude corresponding to standard atmospheric pressure), the current open pressure may increase.

[0097] Based on the above, the preset relationship in the step of updating the current closed pressure at the current altitude based on the current altitude and the preset relationship can be set such that if the current altitude decreases at the altitude corresponding to standard atmospheric pressure, then the current closed pressure and the current open pressure can remain unchanged.

[0098] Figure 7 This is a flowchart illustrating another embodiment of the vehicle vacuum pump provided in this application.

[0099] Combination Figure 7 In some specific embodiments, before the step of obtaining the pressure inside the vacuum tank when the vacuum pump is working, i.e. before step S11 above, the method further includes:

[0100] S71: Monitors the pressure inside the vacuum tank.

[0101] At this time, the pressure inside the vacuum tank is monitored in real time by a pressure monitoring device, thereby obtaining the pressure value of the vacuum tank at various time periods.

[0102] S72: When the pressure inside the vacuum tank is lower than the current opening pressure, control the vacuum pump to work to increase the pressure inside the vacuum tank.

[0103] Based on the current opening pressure described in the above embodiments, if the pressure inside the vacuum tank is lower than the current opening pressure, it indicates that the pressure inside the vacuum tank is too low. In this case, it is necessary to control the vacuum pump to work in order to increase the pressure inside the vacuum tank.

[0104] It should be understood that the steps in this embodiment can be combined with any of the above embodiments, so that the vacuum pump is controlled to work as long as the pressure inside the vacuum tank is less than the current start pressure, thereby ensuring that the pressure inside the vacuum tank is maintained within a stable range.

[0105] Figure 8 This is a flowchart illustrating another embodiment of the vehicle vacuum pump control method provided in this application.

[0106] Combination Figure 8 In some specific embodiments, after the step of controlling the vacuum pump to increase the pressure inside the vacuum tank when the pressure inside the vacuum tank is lower than the current opening pressure, i.e., after step S72 above, the method further includes:

[0107] S81: Obtain the working time of the vacuum pump and the pressure change of the vacuum tank.

[0108] Once the vacuum pump starts working, it is necessary to obtain the working time of the vacuum pump. The pressure change of the vacuum tank can be obtained by obtaining the pressure of the vacuum tank at various moments to obtain the pressure change of the vacuum tank within a certain time period.

[0109] S82: Obtain the rate of change of pressure inside the vacuum tank based on the pressure change.

[0110] This allows for the preset of a specific time period and the acquisition of the pressure change within that period, thereby obtaining the pressure change rate over that specific time period. It should be understood that this pressure change rate may change over time.

[0111] It should be understood that in all the above embodiments, after the step of obtaining the pressure inside the vacuum tank when the vacuum pump is working, i.e., after step S11 above, the method further includes: controlling the vacuum pump to stop working when the pressure inside the vacuum tank is greater than or equal to the current shut-off pressure. That is, under any circumstances, as long as the pressure inside the vacuum tank is greater than or equal to the current shut-off pressure, it is necessary to control the vacuum pump to stop working.

[0112] A second aspect of this application provides a vehicle 20, Figure 9 This is a schematic diagram of the structural frame of an embodiment of the vehicle 20 provided in this application.

[0113] Combination Figure 9 The vehicle 20 includes a processor 21 and a memory 22. The processor 21 is connected to the memory 22, and the processor 21 and the memory 22 communicate with each other via a communication bus. The memory 22 is used to store at least one executable instruction, which causes the processor 21 to execute the vehicle vacuum pump control method as described above.

[0114] The processor 21 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application. The one or more processors 21 included in the vehicle may be of the same type, such as one or more CPUs; or they may be of different types, such as one or more CPUs and one or more ASICs. The memory 22 may include high-speed RAM and may also include non-volatile memory, such as at least one disk storage device.

[0115] A third aspect of this application provides a computer-readable storage medium 30. Figure 10 This is a schematic diagram of the structural framework of an embodiment of the computer-readable storage medium 30 provided in this application.

[0116] The computer-readable storage medium 30 stores program instructions 31, which, when executed by a processor, implement the vehicle vacuum pump control method as described in any of the above embodiments.

[0117] The computer-readable storage medium 30 may include various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0118] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A method for controlling a vehicle vacuum pump, wherein the vacuum pump is connected to a vacuum tank, and the vacuum pump is used to extract air from the vacuum tank when it is operating, the method comprising: The pressure inside the vacuum tank is obtained when the vacuum pump is working; When the vacuum pump has been operating for a preset maximum time or the rate of change of pressure is less than a preset value, and the pressure inside the vacuum tank is less than the current shut-off pressure, the vacuum pump is controlled to stop operating. The current shut-off pressure is updated based on the maximum pressure inside the vacuum tank when the vacuum pump is operating and a preset relationship; wherein, the preset relationship includes the relationship between the maximum pressure inside the vacuum tank and the shut-off pressure when the vacuum pump is operating at different altitudes; Obtain the vehicle's operating status; When the vehicle is in motion, the altitude change of the vehicle is acquired, and the current altitude of the vehicle is updated based on the altitude change. Update the current closed pressure at the current altitude based on the current altitude and the preset relationship; When the pressure inside the vacuum tank is lower than the current opening pressure, the vacuum pump is controlled to operate and the pressure change inside the vacuum tank is acquired. When the pressure change is less than a preset amount and the remaining working time of the vacuum tank is less than a preset time, the current altitude of the vehicle is updated; wherein the preset amount is less than or equal to 0. After the vacuum pump reaches the preset maximum working time for the current operation, the vacuum pump is controlled to stop working. After a preset interval after the vacuum pump stops working, the vacuum pump is controlled to start working again; When the vacuum pump has been operating for a preset maximum time or the rate of change of pressure is less than a preset value, and the pressure inside the vacuum tank is less than the current shutdown pressure, the vacuum pump is controlled to stop operating.

2. The control method for a vehicle vacuum pump according to claim 1, characterized in that, The step of acquiring the altitude change of the vehicle while the vehicle is in motion, and updating the current altitude of the vehicle based on the altitude change, includes: Obtain the vehicle's driving gradient and speed within a single sampling time period; The single altitude change of the vehicle within the single sampling time period is obtained based on the driving gradient and the vehicle speed. The altitude change of the vehicle is obtained based on all of the individual altitude changes.

3. The control method for a vehicle vacuum pump according to claim 1, characterized in that, After the step of controlling the vacuum pump to stop working when the vacuum pump has been operating for a preset maximum time or the rate of change of pressure is less than a preset value, and the maximum pressure inside the vacuum tank is less than the current shutdown pressure, the method further includes: The current activation pressure is updated based on the maximum pressure inside the vacuum tank when the vacuum pump is operating and a preset relationship; wherein, the preset relationship includes the relationship between the maximum pressure inside the vacuum tank when the vacuum pump is operating at different altitudes and the activation pressure of the vacuum pump.

4. The control method for a vehicle vacuum pump according to claim 3, characterized in that, The step of updating the current activation pressure based on the maximum pressure inside the vacuum tank when the vacuum pump is operating and a preset relationship includes: When the maximum pressure is less than the current closing pressure, the value of the current opening pressure is reduced.

5. The vacuum pump control method according to claim 1, characterized in that, Before the step of obtaining the pressure inside the vacuum tank when the vacuum pump is operating, the method further includes: Monitor the pressure inside the vacuum tank; When the pressure inside the vacuum tank is lower than the current opening pressure, the vacuum pump is controlled to operate to increase the pressure inside the vacuum tank.

6. The vacuum pump control method according to claim 5, characterized in that, After the step of controlling the vacuum pump to increase the pressure inside the vacuum tank when the pressure inside the vacuum tank is lower than the currently activated pressure, the method further includes: The working time of the vacuum pump and the pressure change of the vacuum tank are obtained; The rate of change of pressure inside the vacuum tank is obtained based on the pressure change.

7. The vacuum pump control method according to claim 1, characterized in that, After the step of obtaining the pressure inside the vacuum tank when the vacuum pump is operating, the method further includes: When the pressure inside the vacuum tank is greater than or equal to the current shut-off pressure, the vacuum pump is controlled to stop working.

8. A vehicle, characterized in that, The vehicle includes a processor and a memory, the processor being connected to the memory, the memory being used to store at least one executable instruction, the executable instruction causing the processor to perform the vehicle vacuum pump control method as described in any one of claims 1-7.

9. A computer-readable storage medium, characterized in that, The storage medium stores at least one executable instruction, which, when executed on the vehicle, causes the vehicle to perform the control method for the vehicle vacuum pump as described in any one of claims 1-7.

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