Vacuum pump control structure, vacuum control system and fault processing method thereof

Abstract

The invention discloses a vacuum pump control structure, a vacuum control system and a fault handling method.The vacuum pump control structure comprises a control loop board, a first vacuum pump and a second vacuum pump, and the control loop board is used for information processing, fault alarming and starting and stopping control over the vacuum pumps; the control loop board comprises a microprocessor module, a data receiving and transmitting module and two control modules, the two control modules are symmetrically arranged on the two sides of the microprocessor module and are in signal connection with the microprocessor module, and the data receiving and transmitting module is in signal connection with the microprocessor module and used for achieving information transmission; the first vacuum pump is electrically connected with the first control module of the control loop board, and the second vacuum pump is electrically connected with the second control module of the control loop board. The vacuum pump controller solves the problems that in the prior art, a vacuum pump controller has many parts, the occupied space of the vacuum pump controller is large, and the quality requirement of the vacuum pump controller is high.

Description

Technical Field

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

[0002] The vacuum pump controller is a necessary device for controlling the start and stop of the vacuum pump. In order to improve the safety of the vehicle, many vehicles now use two controllers to control the corresponding vacuum pump structure respectively. However, the increase in the number of controller parts increases the complexity of the vehicle wiring harness and pipeline layout, and also makes the management and quality traceability of parts more demanding. In addition, the existing vacuum pump control system does not provide comprehensive fault alarm information to the vehicle driver. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a vacuum pump control structure, a vacuum control system and a fault handling method thereof.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] In a first aspect, a vacuum pump control structure is provided, comprising:

[0006] A control circuit board for processing information, fault alarm and realizing start and stop control of the vacuum pump, the control circuit board includes a microprocessor module, a data transceiver module and two control modules, the two control modules are symmetrically arranged on both sides of the microprocessor module and are both connected to the microprocessor module by signal, the data transceiver module is connected to the microprocessor module by signal, and is used to realize information transmission;

[0007] A first vacuum pump is electrically connected to the first control module of the control circuit board;

[0008] A second vacuum pump is electrically connected to the second control module of the control circuit board;

[0009] The microprocessor module and the first control module form a first control loop, the microprocessor module and the second control module form a second control loop, and the microprocessor module realizes independent start and stop control of the corresponding vacuum pump through the two control modules.

[0010] In some embodiments, the control circuit board further includes:

[0011] A power supply module is used to supply power to the circuit system of the control circuit board.

[0012] In some embodiments, the vacuum pump control structure further comprises:

[0013] a housing for protecting the control circuit board, wherein the control circuit board is disposed in a cavity of the housing; and

[0014] A connecting plug is arranged at an opening at the end of the shell and is sealed and connected to the shell. The connecting plug is electrically connected to the control circuit board.

[0015] In some embodiments, the set start threshold of the first vacuum pump is greater than the set start threshold of the second vacuum pump, and the microprocessor module controls the first vacuum pump to start. At this time, the first vacuum pump is in a running state and the second vacuum pump is in a stopped state.

[0016] In some embodiments, the set start threshold of the first vacuum pump is the same as the set start threshold of the second vacuum pump, and the microprocessor module controls the first vacuum pump and the second vacuum pump to start at the same time. At this time, the first vacuum pump and the second vacuum pump are both in operation.

[0017] In a second aspect, a vacuum control system is provided, which, in addition to the vacuum pump control structure, further comprises:

[0018] A vehicle controller, which is linearly connected to the control circuit board and exchanges information through the data transceiver module;

[0019] a vacuum air tank connected to both the first vacuum pump and the second vacuum pump; and

[0020] A sensor for monitoring the vacuum value in the vacuum air tank is arranged in the vacuum air tank and is linearly connected to the control circuit board.

[0021] In some embodiments, the set start threshold of the first vacuum pump is greater than the set start threshold of the second vacuum pump, and the microprocessor module compares and determines the vacuum value monitored by the sensor with the start thresholds of the first vacuum pump and the second vacuum pump. When the vacuum value is greater than the set start threshold of the second vacuum pump and less than the set start threshold of the first vacuum pump, the microprocessor module controls the start of the first vacuum pump through the first control loop. At this time, the first vacuum pump is in an operating state and the second vacuum pump is in a stopped state.

[0022] In some embodiments, the set start threshold of the first vacuum pump is the same as the set start threshold of the second vacuum pump, and the microprocessor module compares and judges the vacuum value monitored by the sensor with the start thresholds of the first vacuum pump and the second vacuum pump. When the vacuum value is less than the set start threshold of the first vacuum pump or the second vacuum pump, the microprocessor module controls the first vacuum pump and the second vacuum pump to start simultaneously through the first control module and the second control module respectively. At this time, the first vacuum pump and the second vacuum pump are both in operation.

[0023] In a third aspect, a vacuum control system fault handling method is provided, which is applicable to the vacuum control system, and comprises the following steps:

[0024] Step S1, monitoring the vacuum value in the vacuum tank by the sensor and transmitting the vacuum value to the control circuit board;

[0025] When the vacuum value in the vacuum tank is greater than the alarm pressure and lasts for a certain period of time, it is determined that the vacuum tank is leaking. At this time, the control circuit board sends an alarm signal to the vehicle controller through the data transceiver module. When the vacuum value in the vacuum tank is less than the alarm pressure, the control circuit board no longer sends an alarm signal to the vehicle controller.

[0026] When the output voltage of the sensor signal exceeds the normal working range and lasts for a certain period of time, it is determined that the sensor is faulty. At this time, the control circuit board sends an alarm signal to the vehicle controller through the data transceiver module and controls the corresponding vacuum pump to be in an intermittent working state. When the output voltage of the sensor returns to the normal parameter range, the control circuit board stops sending the alarm signal and controls the corresponding vacuum pump to resume normal operation.

[0027] Step S2, comparing the vacuum value received from the sensor with the set start thresholds of the first vacuum pump and the second vacuum pump through the control circuit board, when the vacuum value in the vacuum tank reaches the start threshold of the first vacuum pump or the second vacuum pump, the control circuit board controls the corresponding vacuum pump to start working, and then, when the vacuum value in the vacuum tank reaches a predetermined value, the control circuit board controls the corresponding vacuum pump to stop working;

[0028] When the working current of the first vacuum pump or the second vacuum pump exceeds the working range and lasts for a certain period of time, it is judged as a vacuum pump overcurrent fault. At this time, the control circuit board controls the vacuum pump with overcurrent fault to stop working and records the number of faults. After that, the vacuum pump with overcurrent fault stops working for a certain period of time and then automatically recovers. When the number of faults reaches a certain value, the control circuit board sends an alarm signal to the vehicle controller through the data transceiver module and controls the vacuum pump with fault to stop working, and the fault needs to be resolved by re-powering on.

[0029] When the voltage in the first control module or the second control module exceeds the working range of the voltage system and lasts for a certain period of time, it is determined that the power supply voltage is abnormal. At this time, the control circuit board controls the corresponding vacuum pump to stop working and sends an alarm signal to the vehicle controller. When the voltage in the control circuit corresponding to the faulty vacuum pump returns to the normal range and lasts for a certain period of time, the control circuit board stops sending the alarm signal and controls the corresponding vacuum pump to resume normal operation.

[0030] When the control circuit board receives an abnormal data message and it lasts for a certain period of time, it is judged that the control circuit board has an abnormality or an abnormality occurs in the information exchange process with the vehicle controller. At this time, the control circuit board sends an alarm signal to the vehicle controller. When the control circuit board receives a normal message from the vehicle controller, the control circuit board stops sending an alarm signal.

[0031] The beneficial effects of the present invention are as follows: two independent control loops that do not affect each other are integrated on a single controller and the two control loops are connected to corresponding vacuum pumps. The control of the two control loops by the microprocessor module of the controller can realize independent start and stop control of the two vacuum pumps. The present invention has the advantages of small size, simple structure, convenient and quick assembly, excellent waterproof performance, strong practicality, etc., and can effectively solve the problem of complex wiring harness layout of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 is a connection relationship diagram of a vacuum control system provided in one embodiment of the present invention;

[0034] Figure 2 is an exploded view of a controller provided in one embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of the structure of a control circuit board provided in one embodiment of the present invention;

[0036] Figure 4 is a side view of a controller provided in one embodiment of the present invention;

[0037] Figure 5 Detailed description of the invention The figure is a flow chart of a method for troubleshooting a vacuum control system provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0038] 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.

[0039] The present invention provides a vacuum pump control structure, which solves the problems of many parts of a vacuum pump controller, large space occupied by the vacuum pump controller, and high quality requirements of the vacuum pump controller. The present invention also provides a vacuum control system using the vacuum pump control structure, and a vehicle using the vacuum control system.

[0040] like Figure 1-2 As shown, in one embodiment, the vacuum pump control structure includes a control circuit board 102, a first vacuum pump 20 and a second vacuum pump 30. The control circuit board 102 is used to process information, fault alarm and realize the start and stop control of the vacuum pump. The control circuit board 102 includes a microprocessor module 1022, a data transceiver module 1023 and two control modules, wherein the two control modules are a first control module 1021a and a second control module 1021b, respectively. The first control module 1021a and the second control module 1021b are symmetrically arranged on both sides of the microprocessor module 1022 and are connected to the microprocessor module 1023. The module 1022 is connected by signal, and the data transceiver module 1023 is connected by signal with the microprocessor module 1022 to realize information transmission; the first vacuum pump 20 is electrically connected with the first control module 1021a; the second vacuum pump 30 is electrically connected with the second control module 1021b; the microprocessor module 1022 and the first control module 1021a form a first control loop 1025a, and the microprocessor module 1022 and the second control module 1021b form a second control loop 1025b. The microprocessor module 1022 realizes independent start and stop control of the corresponding vacuum pump through the two control modules. In one embodiment, as Figure 2-4As shown, the controller 10 includes a shell 101, a control circuit board 102 and a connecting plug 103. The shell 101 is formed by connecting two hard metal shell components with hollow interiors and has good heat dissipation performance, wherein the two shell components are an upper shell 1011 and a lower shell 1012, respectively. A groove is engraved on the top of the lower shell 1012 and a sealing structure 1013 is arranged inside the groove. The upper shell 1011 and the lower shell 1012 are tightly connected through the sealing structure 1013, thereby ensuring the sealing of the entire controller 10. In one embodiment, the sealing structure 1013 uses an O-ring and a sealant to improve the sealing and waterproof properties of the entire shell. Other sealing structures 1013 such as a rectangular ring may also be used. The control circuit board 102 is used to process information, fault alarms and realize the start and stop control of the first vacuum pump 20 and the second vacuum pump 30. It is arranged in the cavity of the shell 101 and is fixed to the extension inside the shell 101 by bolts. In one embodiment, as Figure 3 As shown, the control circuit board 102 includes a microprocessor module 1022, a first control module 1021a, a second control module 1021b, a data transceiver module 1023 and a power module 1024. The microprocessor module 1022 is used to process information and realize the start and stop control of the vacuum pump. It is arranged at the center of the control circuit board 102 and is connected to the first control module 1021a and the second control module 1021b by signal. In one embodiment, the microprocessor module 1022 adopts a single-chip microcomputer; the power module 1024 is arranged at the upper right of the control circuit board 102 to power the circuit system of the control circuit board. The data transceiver module 1023 is arranged at the upper left of the control circuit board 102 to realize fault alarm. In one embodiment, the first control module 1021a and the second control module 1021b both adopt control components composed of electronic components such as triodes, resistors, capacitors, and MOS tubes. When the control circuit receives the control signal from the processor module, the start and stop control of the vacuum pump is realized according to the characteristics of the electronic components. As shown Figure 4 As shown, the connection plug 103 is arranged at the opening at the end of the shell 101 and is sealed and connected to the shell 101 by a sealant. The connection plug 103 is directly inserted into the control circuit board 102 and is electrically connected to the control circuit board 102; in one embodiment, the connection plug 103 adopts a 24-core plug-in.

[0041] In one embodiment, the set start threshold of the first vacuum pump 20 is greater than the set start threshold of the second vacuum pump 30, and the microprocessor module 1022 controls the first vacuum pump 20 to start. At this time, the first vacuum pump 20 is in operation and the second vacuum pump 30 is in a stopped state; in one embodiment, when the start threshold of the first vacuum pump 20 is set to -60Kpa and the start threshold of the second vacuum pump 30 is set to -45Kpa, the microprocessor module 1022 controls the first vacuum pump 20 to start. At this time, the first vacuum pump 20 is in operation and the second vacuum pump 30 is in a stopped state, which can avoid the first vacuum pump 20 and the second vacuum pump 30 starting at the same time to cause excessive noise; in addition, since the start threshold of the second vacuum pump 30 is relatively low, in the actual steps, the operating frequency of the second vacuum pump 30 is much lower than that of the first vacuum pump 20. When the life of the first vacuum pump 20 is exhausted, the second vacuum pump 30 can still start working to ensure the braking force of the whole vehicle.

[0042] In one embodiment, the set start threshold of the first vacuum pump 20 is the same as the set start threshold of the second vacuum pump 30, and the microprocessor module 1022 controls the first vacuum pump 20 and the second vacuum pump to start at the same time. At this time, the first vacuum pump and the second vacuum pump are both in operation; in one embodiment, when the start threshold of the first vacuum pump 20 and the start threshold of the second vacuum pump 30 are both set to -60Kpa, the microprocessor module 1022 controls the first vacuum pump 20 and the second vacuum pump 30 to start at the same time. At this time, the first vacuum pump 20 and the second vacuum pump 30 are both in operation.

[0043] like Figure 1 As shown, in one embodiment, a vacuum control system is provided, which includes, in addition to the vacuum pump control structure mentioned in the above embodiment, a vehicle controller 40, a vacuum air tank 50 and a sensor 60. The vehicle controller 40 is linearly connected to the microprocessor module 1022; the vacuum air tank 50 is connected to both the first vacuum pump 20 and the second vacuum pump 30; the sensor 60 is arranged in the vacuum air tank 50, for transmitting the vacuum value in the vacuum air tank 50, and the sensor 60 is linearly connected to the microprocessor module 1022.

[0044] In one embodiment, when the set start threshold of the first vacuum pump 20 is greater than the set start threshold of the second vacuum pump 30, the microprocessor module 1022 compares and judges the vacuum value monitored by the sensor 60 with the start thresholds of the first vacuum pump 20 and the second vacuum pump 30. When the vacuum value is greater than the set start threshold of the second vacuum pump 30 and less than the set start threshold of the first vacuum pump 20, the microprocessor module 1022 controls the start of the first vacuum pump 20 through the first control loop 1025a. At this time, the first vacuum pump 20 is in an operating state and the second vacuum pump 30 is in a stopped state.

[0045] In one embodiment, the set start threshold of the first vacuum pump 20 is the same as the set start threshold of the second vacuum pump 30. The microprocessor module 1022 compares and judges the vacuum value monitored by the sensor 60 with the start thresholds of the first vacuum pump 20 and the second vacuum pump 30. When the vacuum value is less than the set start threshold of the first vacuum pump 20 or the second vacuum pump 30, the microprocessor module 1022 controls the first vacuum pump 20 and the second vacuum pump 30 to start at the same time through the first control module 1021a and the second control module 1021b respectively. At this time, the first vacuum pump 20 and the second vacuum pump 30 are both in operation.

[0046] In one embodiment, if Figure 5 As shown, a vacuum control system fault processing method includes the following steps:

[0047] Step S1, monitoring the vacuum value in the vacuum tank 50 through the sensor 60 and transmitting the vacuum value to the control circuit board 102;

[0048] When the vacuum value in the vacuum tank 50 is greater than the alarm pressure and lasts for 10s, it is judged as a vacuum tank leakage fault. At this time, the microprocessor module 1022 sends an alarm signal to the vehicle controller 40 through the data transceiver module 1023. When the vacuum value in the vacuum tank 50 is less than the alarm pressure, the microprocessor module 1022 no longer sends an alarm signal to the vehicle controller 40. In one embodiment, the parameters of the low vacuum value holding time can be adjusted according to the actual vehicle use steps and the matching vacuum system.

[0049] When the output voltage of the sensor 60 signal exceeds the normal working range and lasts for 2s, it is judged that the sensor 60 has a fault. At this time, the microprocessor module 1022 sends an alarm signal to the vehicle controller 40 through the data transceiver module 1023 and controls the corresponding vacuum pump to be in an intermittent working state. When the output voltage of the sensor 60 returns to the normal parameter range, the microprocessor module 1022 stops sending the alarm signal and controls the vacuum pump to resume normal operation. In one embodiment, when the sensor 60 signal is abnormal, the microprocessor module 1022 can no longer receive the correct signal, and it is impossible to ensure that the microprocessor module 1022 makes the correct control instruction. At this time, the vacuum pump is in an intermittent working state, that is, it works for 20S and stops for 3 seconds. The purpose is to meet the braking force of the vehicle while avoiding the reduction of the product life of the vacuum pump due to long-term ineffective work, and to prevent the vacuum pump from not working when the sensor 60 fails, thereby causing the entire system to fail and increase redundancy. In one embodiment, the duration of the intermittent working of the vacuum pump can be adjusted according to the specific vacuum pump exhaust efficiency and the vacuum control system configuration used by the vehicle;

[0050] Step S2, the control circuit board 102 compares the vacuum value received from the sensor 60 with the set start thresholds of the first vacuum pump 20 and the second vacuum pump 30. When the vacuum value in the vacuum tank 50 reaches the start threshold of the first vacuum pump 20 or the second vacuum pump 30, the control circuit board 102 controls the corresponding vacuum pump to start working. Afterwards, when the vacuum value in the vacuum tank 50 reaches a predetermined value, the control circuit board 102 controls the corresponding vacuum pump to stop working.

[0051] When the working current of the first vacuum pump 20 or the second vacuum pump 30 exceeds the working range and lasts for 500mms, it is judged as an overcurrent fault of the vacuum pump. At this time, the microprocessor module 1022 controls the vacuum pump with overcurrent fault to stop working and records the number of faults once. After that, the vacuum pump with overcurrent fault stops working for 5s and then automatically recovers. When the number of faults reaches 10 times, the microprocessor module 1022 sends an alarm signal to the vehicle controller 40 through the data transceiver module 1023 and controls the vacuum pump with fault to stop working, and the fault needs to be resolved by powering on again;

[0052] When the voltage in the first control loop 1025a or the second control loop 1025b exceeds the working range of the voltage system and lasts for 500ms, it is determined that the power supply voltage of the vehicle is abnormal. At this time, the microprocessor module 1022 controls the corresponding vacuum pump to stop working and sends an alarm signal to the vehicle controller 40. When the voltage in the faulty control loop returns to the normal range and lasts for 500ms, the microprocessor module 1022 stops sending the alarm signal and controls the corresponding vacuum pump to resume normal operation. In one embodiment, the duration of the voltage abnormality of the first control loop 1025a or the second control loop 1025b can be appropriately adjusted according to the power supply situation of the vehicle to avoid frequent false alarms.

[0053] When the microprocessor module 1022 receives an abnormal data message from the vehicle controller 40 and the message lasts for 5 seconds, it is determined that the control circuit board 102 has an abnormality or an abnormality occurs in the information exchange process with the vehicle controller 40. At this time, the microprocessor module 1022 sends an alarm signal to the vehicle controller 40. When the microprocessor module 1022 receives a normal message from the vehicle controller 40, the microprocessor module 1022 stops sending an alarm signal.

[0054] The present invention integrates two independent control loops that do not affect each other on the control loop board 102 of a single controller 10, uses a single controller 10 to replace two independent controllers, and independently controls the two control loops through a single microprocessor module 1022 to achieve start and stop control of two vacuum pumps. It has the advantages of small size, simple structure, convenient and quick assembly, excellent waterproof performance, strong practicality, etc., and can effectively solve the problem of wiring harness layout; at the same time, the vacuum control system of the present invention can meet the different vacuum requirements of the whole vehicle, and the vacuum control system fault alarm strategy is comprehensive.

[0055] 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 structure, characterized in that: include: A control circuit board for processing information, fault alarm and realizing start and stop control of the vacuum pump, the control circuit board includes a microprocessor module, a data transceiver module and two control modules, the two control modules are symmetrically arranged on both sides of the microprocessor module and are both connected to the microprocessor module by signal, the data transceiver module is connected to the microprocessor module by signal, and is used to realize information transmission; A first vacuum pump is electrically connected to the first control module of the control circuit board; A second vacuum pump is electrically connected to the second control module of the control circuit board; The microprocessor module and the first control module form a first control loop, the microprocessor module and the second control module form a second control loop, and the microprocessor module realizes independent start and stop control of the corresponding vacuum pump through the two control modules.

2. The vacuum pump control structure according to claim 1, characterized in that: The vacuum pump control structure also includes: a housing for protecting the control circuit board, wherein the control circuit board is disposed in a cavity of the housing; and A connecting plug is arranged at an opening at the end of the shell and is sealed and connected to the shell. The connecting plug is electrically connected to the control circuit board.

3. The vacuum pump control structure according to claim 1, characterized in that: The set start threshold of the first vacuum pump is greater than the set start threshold of the second vacuum pump, and the microprocessor module controls the first vacuum pump to start. At this time, the first vacuum pump is in a running state and the second vacuum pump is in a stopped state.

4. The vacuum pump control structure according to claim 1, characterized in that: The set start threshold of the first vacuum pump is the same as the set start threshold of the second vacuum pump, and the microprocessor module controls the first vacuum pump and the second vacuum pump to start at the same time. At this time, the first vacuum pump and the second vacuum pump are both in operation.

5. A vacuum control system, characterized in that: In addition to the vacuum pump control structure according to claim 1, the invention also includes: A vehicle controller, which is linearly connected to the control circuit board and exchanges information through the data transceiver module; a vacuum air tank connected to both the first vacuum pump and the second vacuum pump; and A sensor for monitoring the vacuum value in the vacuum air tank is arranged in the vacuum air tank and is linearly connected to the control circuit board.

6. The vacuum control system according to claim 5, characterized in that: The set start threshold of the first vacuum pump is greater than the set start threshold of the second vacuum pump. The microprocessor module compares and judges the vacuum value monitored by the sensor with the start thresholds of the first vacuum pump and the second vacuum pump. When the vacuum value is greater than the set start threshold of the second vacuum pump and less than the set start threshold of the first vacuum pump, the microprocessor module controls the start of the first vacuum pump through the first control loop. At this time, the first vacuum pump is in a running state and the second vacuum pump is in a stopped state.

7. The vacuum control system according to claim 6, characterized in that: The set start threshold of the first vacuum pump is the same as the set start threshold of the second vacuum pump. The microprocessor module compares and judges the vacuum value monitored by the sensor with the start thresholds of the first vacuum pump and the second vacuum pump. When the vacuum value is less than the set start threshold of the first vacuum pump or the second vacuum pump, the microprocessor module controls the first vacuum pump and the second vacuum pump to start simultaneously through the first control module and the second control module respectively. At this time, the first vacuum pump and the second vacuum pump are both in operation.

8. A method for handling vacuum control system faults, applicable to the vacuum control system described in 7, characterized in that: The following steps are involved: Step S1, monitoring the vacuum value in the vacuum tank by the sensor and transmitting the vacuum value to the control circuit board; When the vacuum value in the vacuum tank is greater than the alarm pressure and lasts for a certain period of time, it is determined that the vacuum tank is leaking. At this time, the control circuit board sends an alarm signal to the vehicle controller through the data transceiver module. When the vacuum value in the vacuum tank is less than the alarm pressure, the control circuit board no longer sends an alarm signal to the vehicle controller. When the output voltage of the sensor signal exceeds the normal working range and lasts for a certain period of time, it is determined that the sensor is faulty. At this time, the control circuit board sends an alarm signal to the vehicle controller through the data transceiver module and controls the corresponding vacuum pump to be in an intermittent working state. When the output voltage of the sensor returns to the normal parameter range, the control circuit board stops sending the alarm signal and controls the corresponding vacuum pump to resume normal operation. Step S2, comparing the vacuum value received from the sensor with the set start thresholds of the first vacuum pump and the second vacuum pump through the control circuit board, when the vacuum value in the vacuum tank reaches the start threshold of the first vacuum pump or the second vacuum pump, the control circuit board controls the corresponding vacuum pump to start working, and then, when the vacuum value in the vacuum tank reaches a predetermined value, the control circuit board controls the corresponding vacuum pump to stop working; When the working current of the first vacuum pump or the second vacuum pump exceeds the working range and lasts for a certain period of time, it is judged as a vacuum pump overcurrent fault. At this time, the control circuit board controls the vacuum pump with overcurrent fault to stop working and records the number of faults. After that, the vacuum pump with overcurrent fault stops working for a certain period of time and then automatically recovers. When the number of faults reaches a certain value, the control circuit board sends an alarm signal to the vehicle controller through the data transceiver module and controls the vacuum pump with fault to stop working, and the fault needs to be resolved by re-powering on. When the voltage in the first control module or the second control module exceeds the working range of the voltage system and lasts for a certain period of time, it is determined that the power supply voltage is abnormal. At this time, the control circuit board controls the corresponding vacuum pump to stop working and sends an alarm signal to the vehicle controller. When the voltage in the control circuit corresponding to the faulty vacuum pump returns to the normal range and lasts for a certain period of time, the control circuit board stops sending the alarm signal and controls the corresponding vacuum pump to resume normal operation. When the control circuit board receives an abnormal data message and it lasts for a certain period of time, it is judged that the control circuit board has an abnormality or an abnormality occurs in the information exchange process with the vehicle controller. At this time, the control circuit board sends an alarm signal to the vehicle controller. When the control circuit board receives a normal message from the vehicle controller, the control circuit board stops sending an alarm signal.

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