Vacuum pump control system and method

Abstract

The invention discloses a vacuum pump control system and a control method, the vacuum pump control system comprises a sensing device, a display device and a control device, after a vacuum pump works for a first duration, the control device calculates that a parameter of a second difference value is smaller than or equal to a parameter of a set maximum difference value, and when the parameter lasts for a second duration, the vacuum pump is started. And the control device calculates the parameter of the external atmospheric pressure value at the altitude according to the parameter of the first difference value at the moment, and then automatically sets the corresponding parameters of the starting threshold value and the stopping threshold value of the vacuum pump according to different control strategies of the vacuum pump corresponding to different preset parameters of the external atmospheric pressure value. When an external barometric pressure sensor of the whole vehicle is omitted and only a differential pressure sensor is configured, the system can be applied to different altitude environments, and the problem that a vacuum booster system in a high altitude area works abnormally when no external barometric pressure sensor exists is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum pump control, and in particular relates to a vacuum pump control system and a control method. Background Art

[0002] The vacuum pump is an important component that provides vacuum pressure to the automobile braking system. The maximum pressure that the vacuum pump can reach varies with the atmospheric pressure. In order to ensure that the vacuum pump can provide appropriate vacuum pressure in areas with different altitudes, the start threshold and stop threshold in the vacuum pump control method need to be adjusted according to the atmospheric pressure.

[0003] In the case of canceling the external atmospheric pressure sensor, the existing technology adopts a differential pressure sensor, which detects the difference between atmospheric pressure and the air pressure in the vacuum system through a single pressure chip to control the start and stop of the vacuum pump. This technology generally has no effect in plain areas, but in high-altitude areas, when the external atmospheric pressure sensor is canceled, the differential pressure sensor cannot directly receive the atmospheric pressure value to control the threshold start and stop in real time: if the stop threshold is set too low, the braking force of the whole vehicle will be insufficient; if the stop threshold is set too high, the vacuum pump will work for a long time, causing the whole vehicle to alarm and there is a risk of shortening the service life of the vacuum pump or even brake failure. Therefore, the existing technology is prone to the mismatch between the start threshold and the stop threshold in plateau areas, and there are limitations in use. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a vacuum pump control system and a control method.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] In a first aspect, a vacuum pump control system is provided, wherein the vacuum pump control system is electrically connected to a vacuum pump, and comprises:

[0007] The sensing device includes a pressure difference sensor for detecting in real time a first difference between an external atmospheric pressure value and an internal air pressure of the vacuum pump control system;

[0008] a display device for transmitting a fault signal detected by a vacuum pump control system to a driver;

[0009] A control device, electrically connected to the vacuum pump, the sensor device and the display device, the control device is used to receive the parameter signal of the first difference transmitted by the sensor device, and calculate the parameter of the second difference of the real-time fluctuation change of the parameter of the first difference before and after based on the parameter signal of the first difference transmitted in real time; and

[0010] After the vacuum pump has been working for a first period of time and the control device calculates that the parameter of the second difference is less than or equal to the parameter of the set maximum difference and continues for a second period of time, the control device calculates the parameter of the external atmospheric pressure value at the altitude based on the parameter of the first difference at this time, and then automatically sets the corresponding parameters of the start threshold and stop threshold of the vacuum pump according to different vacuum pump control strategies corresponding to different preset parameters of the external atmospheric pressure values.

[0011] In some embodiments, 2. the control device determines whether the vacuum pump fails and the specific type of failure through all received parameter signals;

[0012] When the control device determines that a fault occurs in the vacuum pump, the control device transmits an alarm signal corresponding to the type of fault to the display device and controls the working mode of the vacuum pump accordingly.

[0013] In a second aspect, a vacuum pump control method is provided, comprising the following steps:

[0014] First start the vacuum pump;

[0015] When the control device determines that the first difference reaches a preset stop threshold, the control device controls the vacuum pump to work normally and the control device continuously detects the parameters of the first difference;

[0016] When the control device determines that the first difference value does not reach the preset stop threshold value, the control device starts recording the working time of the vacuum pump;

[0017] Then the control device is used to determine whether the vacuum pump has a fault and the specific type of fault;

[0018] When the control device determines that the vacuum pump has a fault, the control device transmits an alarm signal corresponding to the type of fault to the display device and controls the working mode of the vacuum pump accordingly;

[0019] Then, when the control device determines that the vacuum pump has no fault and the vacuum pump has been working for the first time, and the control device calculates that the parameter of the second difference is greater than the parameter of the set maximum difference and lasts for the second time, the control device calculates the parameter of the external atmospheric pressure value at the altitude based on the parameter of the first difference at this time;

[0020] Finally, the control device automatically sets the corresponding parameters of the start threshold and the stop threshold of the vacuum pump according to different vacuum pump control strategies corresponding to the preset parameters of different external atmospheric pressure values.

[0021] In some embodiments, the control device calculates the parameters of the external atmospheric pressure value at the altitude based on the parameters of the first difference at this time, as follows:

[0022] The parameters of the ultimate absolute pressure value that the vacuum pump can reach are set through the control device;

[0023] The control device calculates the parameters of the outside atmospheric pressure value at the altitude based on the calculation formula of outside atmospheric pressure value=limit absolute pressure value+first difference value.

[0024] In some embodiments, the control device automatically sets the corresponding parameters of the start threshold and the stop threshold of the vacuum pump according to different vacuum pump control strategies corresponding to the preset parameters of different external atmospheric pressure values, as follows:

[0025] When the control device determines that the interval range of the parameter of the external atmospheric pressure value is [60kPa, 70kPa), the control device sets the parameter of the start threshold value to -45kPa and the parameter of the stop threshold value to -50kPa;

[0026] When the control device determines that the interval range of the parameter of the external atmospheric pressure value is [70kPa, 80kPa), the control device sets the parameter of the start threshold value to -50kPa and the parameter of the stop threshold value to -60kPa;

[0027] When the control device determines that the interval range of the parameter of the external atmospheric pressure value is [80kPa, 90kPa), the control device sets the parameter of the start threshold value to -55kPa and the parameter of the stop threshold value to -65kPa;

[0028] When the control device determines that the interval range of the parameter of the external atmospheric pressure value is [90kPa, 100kPa], the control device sets the parameter of the start threshold to -60kPa and the parameter of the stop threshold to -75kPa.

[0029] In some embodiments, the control device determines whether the vacuum pump fails and the specific type of the failure; when the control device determines that the vacuum pump fails, the control device transmits an alarm signal corresponding to the type of failure to the display device and controls the working mode of the vacuum pump accordingly, as follows:

[0030] When the control device determines that the vehicle power supply voltage is not within the normal range and lasts for a third period of time, the control device determines that the fault type is an abnormal power supply voltage fault, transmits an alarm signal corresponding to the abnormal power supply voltage fault to the display device through the control device, and controls the vacuum pump to stop working accordingly through the control device;

[0031] When the control device determines that the vehicle power supply voltage is within the normal range and the parameter of the first difference is less than the vacuum minimum value and lasts for a fourth time period, the control device determines that the fault type is a low vacuum fault, transmits an alarm signal corresponding to the low vacuum fault to the display device through the control device, and controls the vacuum pump to continue working accordingly through the control device;

[0032] When the control device determines that the power supply voltage of the whole vehicle is within the normal range, the parameter of the first difference is greater than or equal to the minimum vacuum value, and the parameter of the first difference is not within the normal range, the control device determines that the fault type is a sensor fault, and the control device transmits an alarm signal corresponding to the sensor fault to the display device and controls the vacuum pump to enter a fault mode accordingly.

[0033] In some embodiments, the control device controls the vacuum pump to enter a fault mode accordingly, specifically: the control device controls the vacuum pump to pause for a sixth time period after working for a fifth time period.

[0034] In some embodiments, when the control device determines that the vacuum pump overcurrent is greater than the maximum current of the vacuum pump and lasts for a seventh period of time, the vacuum pump is controlled to stop working by the control device and the number of times the vacuum pump stops working is recorded by the control device;

[0035] When the control device determines that the number of shutdown times reaches the maximum number of shutdowns, the control device transmits an alarm signal corresponding to the overcurrent fault to the display device and controls the vacuum pump to stop working accordingly through the control device.

[0036] In some embodiments, the parameter of the maximum difference is set by the control device to 1 kPa.

[0037] In certain embodiments, the parameter of the limit absolute pressure value is set by the control device to 101.3 kPa.

[0038] The beneficial effect of the present invention is that when the external atmospheric pressure sensor is eliminated from the vehicle and only a differential pressure sensor is configured, the external altitude conditions are determined in combination with the working performance of the vacuum pump, and then the start threshold and the stop threshold are changed by the control device. It can be applied to environments with different altitudes and solve the problem of abnormal operation of the vacuum assist system in high-altitude areas when there is no external atmospheric pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0040] Figure 1 is a flow chart of a vacuum pump control system and a control method provided in one embodiment of the present invention;

[0041] Figure 2 is a control connection diagram of a vacuum pump control system and a control method provided in one embodiment of the present invention;

[0042] Figure 3 It is a corresponding diagram of different vacuum pump start thresholds and stop thresholds corresponding to parameters of different preset external atmospheric pressure values ​​provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0044] like Figure 1-2 As shown, a vacuum pump 10 control system is provided. The vacuum pump 10 control system is electrically connected to the vacuum pump 10 and includes a sensor device 20, a display device 30 and a control device 40.

[0045] The sensing device 20 is used to detect in real time a first difference 401 between the external atmospheric pressure and the internal air pressure of the vacuum pump 10 control system; the display device 30 is used to transmit a fault signal detected by the vacuum pump 10 control system to the driver; the control device 40 is electrically connected to the vacuum pump 10, the sensing device 20 and the display device 30, and the control device 40 is used to receive a parameter signal of the first difference 401 transmitted by the sensing device 20, and calculate a parameter of a second difference 402 of the first difference 401 that fluctuates in real time based on the parameter signal of the first difference 401 transmitted in real time.

[0046] After the vacuum pump 10 has been working for the first time period 4051 and the control device 40 has calculated that the parameters of the second difference 402 are less than or equal to the parameters of the set maximum difference 403 and continue for the second time period 4052, the control device 40 calculates the parameters of the external atmospheric pressure value 404 at the altitude based on the parameters of the first difference 401 at this time, and then automatically sets the corresponding parameters of the start threshold 101 and the stop threshold 102 of the vacuum pump 10 according to the different control strategies of the vacuum pump 10 corresponding to the preset different external atmospheric pressure values ​​404.

[0047] It is understandable that when the vacuum pump 10 works for a long time and the vacuum pressure remains unchanged for a period of time, the vacuum pump 10 reaches the limit absolute pressure value 103. According to the performance conditions of the vacuum pump 10 at different altitudes, the limit absolute pressure value 103 after working for a long time is combined with the parameters of the first difference 401 detected by the sensor device 20 in the vehicle system to deduce the external atmospheric pressure value 404 at this time, and then according to the external atmospheric pressure value 404, the control strategies of the vacuum pump 10 corresponding to the different parameters of the external atmospheric pressure values ​​404 preset in the control device 40 automatically set the corresponding parameters of the start threshold 101 and the stop threshold 102 of the vacuum pump 10.

[0048] like Figure 1As shown, in one embodiment, the control device 40 determines whether the vacuum pump 10 has a fault and the specific fault type through all received parameter signals;

[0049] When the control device 40 determines that a fault occurs in the vacuum pump 10 , the control device 40 transmits an alarm signal corresponding to the type of fault to the display device 30 and controls the working mode of the vacuum pump 10 accordingly.

[0050] It can be understood that when the vacuum pump 10 is working normally, the first difference 401 has a certain numerical range. When the control device 40 determines that the second difference 402 develops the parameter of the maximum difference 403, it proves that the vacuum pump 10 has a fault. At this time, the control device 40 analyzes the first difference 401 again to determine what kind of fault has occurred, and finally transmits the alarm signal corresponding to the fault to the display device 30, and warns the driver through the display device 30.

[0051] like Figure 2 As shown, in one embodiment, the power source 50 provides power for the vacuum pump 10, the sensor device 20, the display device 30 and the control device 40; in one embodiment, the vacuum pump 10 is connected to the air storage device 60, and the sensor device 20 is arranged inside the air storage device 60; in one embodiment, the display device 30 is arranged in the cab, including an instrument display table 301.

[0052] like Figure 1-2 As shown, a vacuum pump 10 control method is provided, comprising the following steps:

[0053] First, start the vacuum pump 10;

[0054] When the control device 40 determines that the first difference 401 reaches the preset stop threshold 102, the control device 40 controls the vacuum pump 10 to work normally and the control device 40 continuously detects the parameters of the first difference 401;

[0055] When the control device 40 determines that the first difference 401 does not reach the preset stop threshold 102, the control device 40 starts recording the working time of the vacuum pump 10;

[0056] Then the control device 40 determines whether the vacuum pump 10 has a fault and the specific fault type;

[0057] When the control device 40 determines that the vacuum pump 10 has a fault, the control device 40 transmits an alarm signal corresponding to the type of fault to the display device 30 and controls the working mode of the vacuum pump 10 accordingly;

[0058] Then, when the control device 40 determines that the vacuum pump 10 has no faults and the vacuum pump 10 works for the first time period 4051, and the control device 40 calculates that the parameter of the second difference 402 is greater than the parameter of the set maximum difference 403 and lasts for the second time period 4052, the control device 40 calculates the parameter of the external atmospheric pressure value 404 at the altitude based on the parameter of the first difference 401 at this time;

[0059] Finally, the control device 40 automatically sets the corresponding parameters of the start threshold 101 and the stop threshold 102 of the vacuum pump 10 according to different control strategies of the vacuum pump 10 corresponding to the parameters of different preset external atmospheric pressure values ​​404 .

[0060] like Figure 1 As shown, in one embodiment, the control device 40 determines whether the vacuum pump 10 has a fault and the specific fault type; when the control device 40 determines that the vacuum pump 10 has a fault, the control device 40 transmits an alarm signal corresponding to the fault type to the display device 30 and controls the working mode of the vacuum pump 10 accordingly, as follows:

[0061] When the control device 40 determines that the vehicle power supply voltage is not within the normal range 406 and lasts for the third time period 4053, the control device 40 determines that the fault type is an abnormal power supply voltage fault, and transmits an alarm signal corresponding to the abnormal power supply voltage fault to the display device 30 through the control device 40, and controls the vacuum pump 10 to stop working accordingly through the control device 40;

[0062] When the control device 40 determines that the vehicle power supply voltage is within the normal range 406 and the parameter of the first difference 401 is less than the vacuum minimum value 407 and lasts for a fourth time period 4054, the control device 40 determines that the fault type is a true low-altitude fault, and transmits an alarm signal corresponding to the sensor fault to the display device 30 through the control device 40, and controls the vacuum pump 10 to continue working accordingly through the control device 40;

[0063] When the control device 40 determines that the vehicle power supply voltage is within the normal range 406, the parameter of the first difference 401 is greater than or equal to the vacuum minimum value 407, and the parameter of the first difference 401 is not within the normal range 406, the control device 40 determines that the fault type is a sensor fault, and the control device 40 transmits an alarm signal corresponding to the sensor fault to the display device 30 and controls the vacuum pump 10 to enter a fault mode accordingly.

[0064] It can be understood that, taking the 12V power supply system as an example, in one embodiment, the normal range 406 of the vehicle power supply voltage is [9V, 12V], and the parameter of the third time length 4053 is 500ms; in one embodiment, the parameter of the vacuum minimum value 407 is 35Kpa, and the parameter of the fourth time length 4054 is 1os; in one embodiment, after the control device 40 determines that the fault type is a low vacuum (insufficient vacuum pressure) fault, when the control device 40 determines that the vacuum pump 10 is working, the vehicle power supply voltage is less than 6.5V or the current is less than 5A, and when the vacuum pump 10 stops working, the vehicle power supply voltage is greater than 6.5V or the current is greater than 5A, and the control device 40 can further determine that the fault type is a vacuum pump 10 fault.

[0065] In one embodiment, the control device 40 controls the vacuum pump 10 to enter the fault mode, specifically: the control device 40 controls the vacuum pump 10 to pause for a sixth time period 4056 after working for a fifth time period 4055. In one embodiment, the parameter of the fifth time period 4055 is 150s, and the parameter of the sixth time period 4056 is 3s.

[0066] In one embodiment, when the control device 40 determines that the overcurrent of the vacuum pump 10 is greater than the maximum current value 408 of the vacuum pump and lasts for the seventh time period 4057, the control device 40 controls the vacuum pump 10 to stop working and records the number of times the vacuum pump 10 stops working.

[0067] When the control device 40 determines that the number of stoppages reaches the maximum number of stoppages, the control device 40 transmits an alarm signal corresponding to the overcurrent fault to the display device 30 and controls the vacuum pump 10 to stop working accordingly through the control device 40. In one embodiment, the parameter of the maximum value 408 of the vacuum pump current is 28A, the parameter of the seventh duration 4057 is 500ms, and the parameter of the number of stoppages is 10 times.

[0068] like Figure 1 As shown, in one embodiment, the parameter of the maximum difference 403 is set to 1 kPa by the control device 40.

[0069] It can be understood that when the second difference 402 is less than or equal to 1 kPa, it can be determined that the parameter of the second difference 402 does not change substantially, and the parameter of the maximum difference 403 can also be set to a parameter smaller than 1 kPa.

[0070] like Figure 1 As shown, in one embodiment, when the volume of the gas storage device 60 connected to the vacuum pump 10 is 5L, the parameter of the first time length 4051 is set to 45s through the control device 40.

[0071] It can be understood that the shortest time required for the vacuum pump 10 to work stably from startup is determined based on the volume of the air storage device 60, so that the control device 40 can calculate and update the parameters of the external atmospheric pressure value 404 more quickly in real time. When the volume of the air storage device 60 is 5L, the shortest time required for the vacuum pump 10 to work stably from startup is 45s. The present invention requires to calibrate the maximum pressure performance of the vacuum pump 10 in advance. For example, when the air storage device 60 has a volume of 5L, the vacuum pump 10 works for 45s and just reaches the limit pressure. If the value is lower than 45s, the vacuum pressure of the vacuum pump 10 will not reach the limit pressure, resulting in distorted pressure judgment, and the program will be switched in advance, resulting in low pressure and ultimately low braking force of the whole vehicle. When the value is greater than 45s, the vacuum pump 10 works for a long time, which affects the total life of the vacuum pump 10 and may cause the vacuum pump 10 to heat up or fail. 45s is not a fixed value, and is adjusted according to the volume of the air storage device 60 and the performance of the vacuum pump 10. The smaller the volume, the smaller the value, and the higher the performance of the vacuum pump 10, the smaller the value.

[0072] like Figure 1 As shown, in one embodiment, when the volume of the gas storage device 60 is 5L, the control device 40 sets the parameter of the second time length 4052 to 5s.

[0073] It is understandable that when the parameters of the second difference 402 do not change substantially after the vacuum pump 10 has been working stably for a period of time, the external atmospheric pressure value 404 can be calculated according to the calculation formula by using the limit absolute pressure value 103 after long-term operation and the first difference 401 detected by the sensor device 20 in the vehicle system. The parameters of the second difference 402 are adjusted according to the volume of the gas storage device 60 and the performance of the vacuum pump 10. The smaller the volume, the smaller the value; the higher the performance of the vacuum pump 10, the smaller the value; specifically, the program is calibrated in advance according to the performance of the vacuum pump 10. When the vacuum pump 10 works to the limit pressure, the pressure curve area is flat and the change per unit time is small. The second difference 402 can be defined according to the working curve of the vacuum pump 10.

[0074] like Figure 1 As shown, in one embodiment, the control device 40 calculates the parameters of the external atmospheric pressure value 404 at the altitude based on the parameters of the first difference 401 at this time, as follows:

[0075] The control device 40 sets the parameters of the limit absolute pressure value 103 that the vacuum pump 10 can reach;

[0076] The control device 40 calculates the parameters of the outside atmospheric pressure value 404 at the altitude based on the calculation formula of outside atmospheric pressure value 404 = limit absolute pressure value 103 + first difference 401.

[0077] It can be understood that the absolute pressure is the pressure calculated from the absolute zero pressure as the starting point, and the gauge pressure is the pressure calculated from the local atmospheric pressure as the starting point. The limit absolute pressure value 103 that the vacuum pump 10 can reach is less affected by the change of the external air pressure, that is, when the external atmospheric pressure changes, the limit absolute pressure value 103 of the vacuum pump 10 does not change much and is within the acceptable tolerance. Therefore, the limit absolute pressure value 103 is a fixed value. The parameters of the limit absolute pressure value 103 and the external atmospheric pressure value 404 and the first difference 401 are known. The control device 40 can calculate the parameters of the external atmospheric pressure value 404 at the altitude according to the calculation formula of the external atmospheric pressure value 404 = the limit absolute pressure value 103 + the first difference 401.

[0078] like Figure 1 As shown, in one embodiment, the parameter of the limit absolute pressure value 103 is set to 101.3 kPa by the control device 40.

[0079] It can be understood that the absolute pressure under standard atmospheric pressure is approximately equal to 101.3 kPa, so the parameter of the limit absolute pressure value 103 is set to 101.3 kPa.

[0080] like Figure 3 As shown, in one embodiment, the control device 40 automatically sets the corresponding parameters of the start threshold 101 and the stop threshold 102 of the vacuum pump 10 according to different control strategies of the vacuum pump 10 corresponding to the parameters of different preset external atmospheric pressure values ​​404, as follows:

[0081] When the control device 40 determines that the parameter interval range of the external atmospheric pressure value 404 is [60 kPa, 70 kPa), the control device 40 sets the parameter of the start threshold 101 to -45 kPa and the parameter of the stop threshold 102 to -50 kPa;

[0082] When the control device 40 determines that the parameter interval range of the external atmospheric pressure value 404 is [70 kPa, 80 kPa), the control device 40 sets the parameter of the start threshold 101 to -50 kPa and the parameter of the stop threshold 102 to -60 kPa;

[0083] When the control device 40 determines that the parameter interval range of the external atmospheric pressure value 404 is [80 kPa, 90 kPa), the control device 40 sets the parameter of the start threshold 101 to -55 kPa and the parameter of the stop threshold 102 to -65 kPa;

[0084] When the control device 40 determines that the parameter interval range of the external atmospheric pressure value 404 is [90 kPa, 100 kPa], the control device 40 sets the parameter of the start threshold 101 to -60 kPa and the parameter of the stop threshold 102 to -75 kPa.

[0085] It can be understood that an altitude of 5600m corresponds to an atmospheric pressure of 50kpa, an altitude of 4200m corresponds to an atmospheric pressure of 60kpa, an altitude of 3000m corresponds to an atmospheric pressure of 70kpa, an altitude of 20000m corresponds to an atmospheric pressure of 80kpa, an altitude of 1000m corresponds to an atmospheric pressure of 90kPa, an altitude of 100m corresponds to an atmospheric pressure of 100kpa, and an altitude of 0m corresponds to an atmospheric pressure of 102kpa. The external atmospheric pressure at different altitudes changes according to the above parameters. In addition, different models have different start thresholds 101 and stop thresholds 102 at different altitudes. This embodiment is a control strategy for different vacuum pumps 10 corresponding to different parameters of external atmospheric pressure values ​​404 preset in advance for a certain model. The above parameters are set according to the thresholds used on the existing actual vehicle; although the vacuum pressure gradually decreases, there will be no situation where there is no vacuum at all, resulting in the failure of the vehicle; on the existing models using the vacuum brake system, there is a certain margin of vacuum pressure, which is generally greater than -35kPa. The larger the vacuum value, the better the braking effect. The present invention uses this preset control strategy to make the vacuum value larger to achieve a better braking effect. The present invention can also set different preset parameters according to the changes in vehicle models to match more vehicle models.

[0086] In the present invention, when the external atmospheric pressure sensor is eliminated from the vehicle and only the differential pressure sensor 201 is configured, the working performance of the vacuum pump 10 is combined to determine the external altitude conditions, and then the start threshold 101 and the stop threshold 102 are changed by the control device 40. It can be applied to environments with different altitudes and solve the problem of abnormal operation of the vacuum assist system in high-altitude areas when there is no external atmospheric pressure sensor.

[0087] The above description is merely a preferred embodiment of one or more embodiments of the present specification and is not intended to limit one or more embodiments of the present specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present specification shall be included in the scope of protection of one or more embodiments of the present specification.

Claims

1. A vacuum pump control system, characterized in that: The vacuum pump control system is electrically connected to the vacuum pump, and the vacuum pump control system includes: The sensing device includes a pressure difference sensor for detecting in real time a first difference between an external atmospheric pressure value and an internal air pressure of the vacuum pump control system; a display device, for transmitting a fault signal detected by the vacuum pump control system to a driver; a control device electrically connected to the vacuum pump, the sensor device and the display device, the control device being used to receive the parameter signal of the first difference transmitted by the sensor device, and calculate the parameter of the second difference whose parameter fluctuates in real time before and after the first difference based on the parameter signal of the first difference transmitted in real time; and After the vacuum pump has been working for a first period of time and the control device calculates that the parameter of the second difference is less than or equal to the parameter of the set maximum difference and continues for a second period of time, the control device calculates the parameter of the external atmospheric pressure value at the altitude based on the parameter of the first difference at this time, and then automatically sets the corresponding parameters of the start threshold and stop threshold of the vacuum pump according to different control strategies of the vacuum pump corresponding to different preset parameters of the external atmospheric pressure value.

2. The vacuum pump control system according to claim 1, characterized in that: The control device determines whether the vacuum pump has a fault and the specific fault type through all received parameter signals; When the control device determines that the vacuum pump fails, the control device transmits an alarm signal corresponding to the type of failure to the display device and controls the working mode of the vacuum pump accordingly.

3. A vacuum pump control method, applicable to the vacuum pump control system according to claim 1 or 2, characterized in that: The following steps are involved: First, start the vacuum pump; When the control device determines that the first difference reaches a preset stop threshold, the control device controls the vacuum pump to work normally and the control device continuously detects the parameters of the first difference; When the control device determines that the first difference does not reach a preset stop threshold, the control device starts recording the working time of the vacuum pump; Then, the control device determines whether the vacuum pump has a fault and the specific type of fault; When the control device determines that the vacuum pump has a fault, the control device transmits an alarm signal corresponding to the type of fault to the display device and controls the working mode of the vacuum pump accordingly; Then, when the control device determines that the vacuum pump has no fault and after the vacuum pump has worked for a first time, and the control device calculates that the parameter of the second difference is greater than the parameter of the set maximum difference and lasts for a second time, the control device calculates the parameter of the external atmospheric pressure value at the altitude based on the parameter of the first difference at this time; Finally, the control device automatically sets the corresponding parameters of the start threshold and the stop threshold of the vacuum pump according to different control strategies of the vacuum pump corresponding to the preset parameters of different external atmospheric pressure values.

4. The vacuum pump control method according to claim 3, characterized in that: The control device calculates the parameters of the external atmospheric pressure value at the altitude based on the parameters of the first difference at this time, specifically as follows: The control device is used to set the parameters of the ultimate absolute pressure value that the vacuum pump can reach; The control device calculates the parameters of the outside atmospheric pressure value at the altitude based on the calculation formula of outside atmospheric pressure value=limit absolute pressure value+first difference value.

5. The vacuum pump control method according to claim 3, characterized in that: The control device automatically sets the corresponding parameters of the start threshold and the stop threshold of the vacuum pump according to different control strategies of the vacuum pump corresponding to the preset parameters of different external atmospheric pressure values, as follows: When the control device determines that the interval range of the parameter of the external atmospheric pressure value is [60kPa, 70kPa), the control device sets the parameter of the start threshold value to -45kPa and the parameter of the stop threshold value to -50kPa; When the control device determines that the interval range of the parameter of the external atmospheric pressure value is [70kPa, 80kPa), the control device sets the parameter of the start threshold value to -50kPa and the parameter of the stop threshold value to -60kPa; When the control device determines that the interval range of the parameter of the external atmospheric pressure value is [80kPa, 90kPa), the control device sets the parameter of the start threshold value to -55kPa and the parameter of the stop threshold value to -65kPa; When the control device determines that the interval range of the parameter of the external atmospheric pressure value is [90kPa, 100kPa], the control device sets the parameter of the start threshold to -60kPa and the parameter of the stop threshold to -75kPa.

6. The vacuum pump control method according to claim 3, characterized in that: The control device determines whether the vacuum pump has a fault and the specific fault type; when the control device determines that the vacuum pump has a fault, the control device transmits an alarm signal corresponding to the fault type to the display device and controls the working mode of the vacuum pump accordingly, as follows: When the control device determines that the vehicle power supply voltage is not within the normal range and lasts for a third period of time, the control device determines that the fault type is an abnormal power supply voltage fault, transmits an alarm signal corresponding to the abnormal power supply voltage fault to the display device through the control device, and controls the vacuum pump to stop working accordingly through the control device; When the control device determines that the vehicle power supply voltage is within the normal range and the parameter of the first difference is less than the vacuum minimum value and lasts for a fourth time period, the control device determines that the fault type is a low vacuum fault, transmits an alarm signal corresponding to the low vacuum fault to the display device through the control device, and controls the vacuum pump to continue working accordingly through the control device; When the control device determines that the power supply voltage of the whole vehicle is within the normal range, the parameter of the first difference is greater than or equal to the minimum vacuum value, and the parameter of the first difference is not within the normal range, the control device determines that the fault type is a sensor fault, and transmits an alarm signal corresponding to the sensor fault to the display device through the control device, and controls the vacuum pump to enter a fault mode accordingly through the control device.

7. The vacuum pump control method according to claim 6, characterized in that: The control device is used to control the vacuum pump to enter a fault mode. Specifically, the control device is used to control the vacuum pump to pause for a sixth time period after working for a fifth time period.

8. The vacuum pump control method according to claim 6, characterized in that: When the control device determines that the overcurrent of the vacuum pump is greater than the maximum current of the vacuum pump and lasts for a seventh period of time, the control device controls the vacuum pump to stop working and records the number of times the vacuum pump stops working; When the control device determines that the number of shutdown times reaches the maximum number of shutdowns, the control device transmits an alarm signal corresponding to the overcurrent fault to the display device and controls the vacuum pump to stop working accordingly.

9. The vacuum pump control method according to claim 3, characterized in that: The parameter of the maximum difference is set to 1 kPa by the control device.

10. The vacuum pump control method according to claim 4, characterized in that: The parameter of the limit absolute pressure value is set by the control device to 101.3 kPa.

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