CN111238745A - System and method for detecting air tightness of high-voltage device of electric automobile - Google Patents
System and method for detecting air tightness of high-voltage device of electric automobile Download PDFInfo
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- CN111238745A CN111238745A CN202010253762.8A CN202010253762A CN111238745A CN 111238745 A CN111238745 A CN 111238745A CN 202010253762 A CN202010253762 A CN 202010253762A CN 111238745 A CN111238745 A CN 111238745A
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- box body
- booster pump
- normally closed
- electromagnetic valve
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3281—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators removably mounted in a test cell
- G01M3/329—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators removably mounted in a test cell for verifying the internal pressure of closed containers
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- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a system and a method for detecting the air tightness of a high-voltage device of an electric automobile.A brake booster pump controller controls a booster pump to be opened and closed according to the state of a brake system, and controls a normally open electromagnetic valve to be opened and closed according to the request of a high-voltage part controller; the high-voltage component controller collects analog electric signals of the air pressure sensor, calculates a current air pressure value in real time, controls the opening or closing of the normally closed electromagnetic valve according to the air pressure state, the pump state fed back by the power pump controller and the state of the normally open electromagnetic valve, judges the current sealing state of the box body according to the change situation of the air pressure value after the normally closed electromagnetic valve is closed, evaluates the air tightness of the box body and reports the air tightness; the invention reduces the cost, simplifies the system, provides safety and reliability, is easy to realize and is suitable for popularization and application.
Description
Technical Field
The invention relates to a detection technology of a high-voltage device of a new energy automobile, in particular to a system and a method for detecting the air tightness of the high-voltage device of an electric automobile.
Background
The high-voltage device of electric automobile can carry out the gas tightness before the whole car assembly and detect, but after the loading, in the use, whether the airtight performance maintains the state that requires is unknown, and if the gas tightness became invalid, will bring into water the risk, lead to other problems such as high-voltage system electric leakage, insulation fault, the incident may even appear.
Patent CN2016110667218 relates to a system and a method for detecting a fault of a high-voltage device of an electric vehicle, and an electric vehicle, wherein the system for detecting a fault of a high-voltage device of an electric vehicle comprises: a plurality of high voltage devices each comprising a respective high voltage interlock monitor; a low voltage signal line in series between the high voltage interlock monitors of the plurality of high voltage devices; a battery management system or a vehicle control unit connected with at least one high-voltage device of the plurality of high-voltage devices via a controller area network connection line for receiving high-voltage interlock status information provided by a high-voltage interlock monitor of the at least one high-voltage device from the at least one high-voltage device; and the instrument is used for displaying the high-voltage interlocking state information. After high-voltage danger occurs, when the position where high-voltage interlocking faults occur is expected to be detected and found out, the high-voltage wire harness and the high-voltage devices do not need to be checked one by one, and the fault position can be quickly positioned through instrument display, so that quick overhaul is facilitated. This technique allows the high voltage system to be disconnected immediately only in the event of a fault.
At present, air tightness detection methods for the industry are various, different products have a set of applicable methods, but in summary, whether the air tightness is qualified or not is judged by judging the leakage value and the air pressure condition; however, designing a special air tightness detection system for detecting the whole vehicle will undoubtedly increase the cost of the whole vehicle greatly.
Therefore, the above problems should be solved in time by those skilled in the art.
Disclosure of Invention
The invention aims to solve the problems and provide a high-pressure device internal controller which utilizes an original vehicle brake booster pump as a system air pressure source and collects tail gas through a high-pressure device box body to increase the air pressure in the box body to form positive pressure; the cost is reduced, the system is simplified, and the system and the method for detecting the air tightness of the high-voltage device of the electric automobile with safety and reliability are provided.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the system and the method for detecting the air tightness of the high-voltage device of the electric automobile are characterized in that the detection system comprises a brake booster pump controller, a brake booster pump, an overflow valve, a normally open electromagnetic valve, a dryer, a normally closed electromagnetic valve, an air pressure sensor, a box body, a high-voltage component controller and a connecting pipeline; the brake booster pump is connected with the overflow valve, the normally open electromagnetic valve and the dryer through connecting pipelines, the dryer is connected with the normally closed electromagnetic valve arranged in the box body, and the box body is internally provided with the air pressure sensor and the high-pressure component controller; the brake booster pump controller controls the booster pump to be opened and closed according to the state of the brake system, and the dryer is connected with the box bodies through connecting pipelines;
the brake booster pump pumps air of the brake vacuum tank to inflate the box body so as to increase the air pressure of the box body; the normally open electromagnetic valve and the normally closed electromagnetic valve are opened and closed to determine the flow direction of the gas, and the gas flows to the box body or flows back to the atmosphere; the overflow valve plays a role in protection and prevents the damage of a pump, a pipeline or a box body caused by overhigh pipeline pressure; the air pressure sensor converts air pressure into an analog electric signal; the high-voltage component controller collects analog electric signals of the air pressure sensor, calculates a current air pressure value in real time, controls the opening or closing of the normally closed electromagnetic valve according to the air pressure state and the states of the pump fed back by the booster pump controller and the normally open electromagnetic valve, judges the sealing state of the current box body according to the change situation of the air pressure value after the normally closed electromagnetic valve is closed, evaluates the air tightness of the box body, and reports the air tightness.
The detection method comprises the following steps:
after initialization of the booster pump controller and the high-voltage component controllers is completed, the booster pump controller controls the booster pump to be turned on and turned off according to the state requirement of the brake system. The high-pressure component controller respectively detects the air pressure value of each box body, if the air pressure value is lower than P0, an inflation request is sent to the booster pump controller, the booster pump controller makes an inflation allowance response to one inflation request according to the working state of the booster pump and the load condition of the booster pump, and the other inflation allowance response is a rejection state; closing the normally open switch valve, opening the normally closed electromagnetic valve when the allowed high-pressure component controller receives an inflation allowing response, allowing the waste gas discharged from the booster pump to enter the box body through the drier and the opened normally closed electromagnetic valve, closing the normally closed electromagnetic valve when the pressure in the box body reaches a set value P0, sending inflation completion to the booster pump controller, opening the normally closed electromagnetic valve when the booster pump controller receives the inflation completion and if no inflation request sent by the controller exists, discharging the waste gas into the atmosphere, and performing the next inflation cycle if other inflation requests exist;
and after the air pressure value in the box body reaches a set value, the high-pressure component controller closes the normally closed electromagnetic valve, timing is started, the speed of reducing the air pressure value is calculated after set time, if the pressure drop speed is smaller than the set value, the box body is considered to have no air tightness risk, and if the pressure drop speed is larger than the set value, the risk is reported to exist for a driver to refer and process.
The booster pump controller always detects the air pressure in the vacuum tank in the process of inflating the box body, when the detected air pressure reaches the booster pump stopping condition, the booster pump controller sends the booster pump stopping working state to the high-pressure part controller which is inflating, after the high-pressure part controller receives the state information, the normally closed electromagnetic valve is closed, the current pressure state of the gas in the box body is kept, the inflation request is continuously sent to the booster pump controller, and the next time the booster pump controller is inflated to allow response to continue inflating is waited.
If the communication fault in the inflation process causes that the high-pressure component controller and the booster pump controller cannot communicate with each other, the normally closed electromagnetic valve is in a normally closed state, and the normally open electromagnetic valve is in a normally open state, so that the brake system is not affected.
The invention has the beneficial effects that:
1. the prior art does not use a brake booster pump as an air pressure source, waste gas of the brake booster pump is directly discharged into the atmosphere, and the system collects tail gas through a high-pressure device box body to enable the air pressure in the box body to rise to form positive pressure.
2. The controller in the high-voltage device of the system judges the air tightness condition of the high-voltage device by detecting the air pressure change, and ensures the normal operation of the high-voltage device.
3. The overflow valve of the system plays a role in protecting the system and the brake boosting system, and ensures that the original brake system can still work normally when the system fails.
4. The system utilizes the air pump of the brake boosting system of the original vehicle to inflate the high-pressure device box body. The controller judges the sealing state of the high-voltage device according to the speed of the air pressure change in the box body, and informs a driver of the air tightness risk of the high-voltage device in an alarming mode once the serious air leakage phenomenon of the box body is found, so that the air tightness risk can be timely processed, and the risk is prevented from being further expanded to cause the fault.
5. The normally open solenoid valve of this system resumes normally open state under the circumstances of outer circuit inefficacy, guarantees that tail gas gets into the atmosphere smoothly, does not increase the burden of brake booster pump.
6. The system has the additional advantage that the box controller and the air pressure sensor can also detect the working state of the high-pressure device. For example, a power battery unit is arranged in the box body, so that the state of the battery can be judged according to air pressure change data, the thermal runaway fault of the battery can be monitored and found, and the thermal runaway fault can be reported immediately, so that the safety of personnel on the vehicle can be ensured.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention;
fig. 2 is a control flow diagram of the present invention.
And (3) appendage marking:
0-booster pump controller 1-booster pump 2-overflow valve 3-normally open solenoid valve 4-dryer 5-normally closed solenoid valve 6-baroceptor 7-box 8-high pressure part controller 9-normally closed solenoid valve two 10-baroceptor two 11-box two 12-high pressure part sensor one 13-normally closed solenoid valve three 14-baroceptor three 15-box three 16-high pressure part controller two 7-normally closed solenoid valve four 18-baroceptor four 19-box four 20-high pressure part sensor two N + 1-normally closed solenoid valve N N + 2-baroceptor N N + 3-box N N + 4-high pressure part controller N.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1-2, in an embodiment, the detection system includes a brake booster pump controller 0, a brake booster pump 1, an overflow valve 2, a normally open electromagnetic valve 3, a dryer 4, a normally closed electromagnetic valve 5, an air pressure sensor 6, a box body 7, a high-voltage component controller 8 and a connecting pipeline; the brake booster pump 1 is connected with the overflow valve 2, the normally open electromagnetic valve 3 and the dryer 4 through connecting pipelines, the dryer 4 is connected with a normally closed electromagnetic valve I5 arranged in a box body I7, and an air pressure sensor I6 and a high-pressure component controller I8 are arranged in the box body I7; the brake booster pump controller 0 controls the booster pump 1 to be opened and closed according to the state of a brake system, and the dryer 4 is respectively connected with a normally closed electromagnetic valve I5 in a box body I7, a normally closed electromagnetic valve II 9 in a box body II 11, a normally closed electromagnetic valve III 13 in a box body III 15, a normally closed electromagnetic valve IV 17 in a box body IV 19 and a normally closed electromagnetic valve N in a box body N through connecting pipelines;
in the specific implementation process, a normally closed solenoid valve I5, an air pressure sensor I6 and a high-pressure component controller I8 are arranged in a box body I7; a normally closed solenoid valve II 9, an air pressure sensor II 10 and a high-pressure component sensor I12 are arranged in the box body II 11; a normally closed solenoid valve III 13, an air pressure sensor III 14 and a high-pressure component controller II 16 are arranged in the box body III 15; a normally closed solenoid valve IV 17, an air pressure sensor IV 18 and a high-pressure component sensor II 20 are arranged in the box body IV 19; a normally closed solenoid valve N, an air pressure sensor N and a high-pressure component controller N are arranged in the N +3 box body;
in the specific implementation process, the brake booster pump controller 0 controls the booster pump 1 to be opened and closed according to the state of a brake system, and controls the normally open electromagnetic valve 3 to be opened and closed according to the request of the high-pressure component controller 8; the normally open electromagnetic valve 3 and the normally closed electromagnetic valve 5 open and close the combined state to determine the flow direction of the gas, and the gas flows to the box body 7 or flows back to the atmosphere; the overflow valve 2 plays a role in protection, and prevents the damage of a pump, a pipeline or a box body 7 caused by overhigh pipeline pressure; the air pressure sensor 6 converts air pressure into a resistance signal; the high-voltage component controller 8 collects resistance signals of the air pressure sensor 6, calculates a current air pressure value in real time, controls the normally closed electromagnetic valve 5 to be opened or closed according to the air pressure state and the states of the pump fed back by the booster pump controller 0 and the normally open electromagnetic valve 3, judges the current sealing state of the box body 7 according to the change situation of the air pressure value after the normally closed electromagnetic valve 5 is closed, evaluates the air tightness of the box body 7 and reports the air tightness.
In the specific implementation process, the detection method comprises the following steps:
after the initialization of the booster pump controller 0 and each high-voltage component controller 8 is completed, the booster pump controller 0 controls the booster pump 1 to be turned on and off according to the state requirement of the brake system. The high-pressure component controller 8 detects the air pressure value of each box body 7 respectively, if the air pressure value is lower than P0, an inflation request is sent to the booster pump controller 0, the booster pump controller 0 makes an inflation allowance response to one inflation request according to the working state of the booster pump 1 and the load condition of the booster pump 1, and the other inflation allowance response is a rejection state; meanwhile, the normally open switch valve 3 is closed, the allowed high-pressure component controller 8 receives an air inflation allowing response, the normally closed electromagnetic valve 5 is opened, the exhaust gas discharged from the booster pump 1 passes through the drier 4 and the opened normally closed electromagnetic valve 5 and enters the box body 7, when the pressure in the box body 7 reaches a set value P0, the normally closed electromagnetic valve 5 is closed, the air inflation completion is sent to the booster pump controller 0, after the booster pump controller 0 receives the air inflation completion, if no air inflation request sent by the controller exists, the normally closed electromagnetic valve 5 is opened, the exhaust gas is discharged to the atmosphere, and if other air inflation requests exist, the next air inflation cycle is carried out;
and after the air pressure value in the box body reaches a set value, the high-pressure component controller 8 closes the normally closed electromagnetic valve 5, starts timing, calculates the reduction rate of the air pressure value after a set time, considers that the box body 7 has no air tightness risk if the pressure reduction rate is smaller than the set value, and reports the risk for the driver to refer and process if the pressure reduction rate is larger than the set value.
The booster pump controller 0 always detects the air pressure in the vacuum tank in the process of inflating the box body 7, when the detected air pressure reaches a booster stop condition, the booster pump controller 0 sends a booster pump stop working state to the high-pressure component controller 8 which is inflating, after the high-pressure component controller 8 receives state information, the normally closed electromagnetic valve 5 is closed, the air pressure state of the box body 7 is kept, an inflation request is continuously sent to the booster pump controller 0, and the next time the booster pump controller 0 is inflated to allow response and continuous inflation is waited.
If the high-pressure component controller 8 and the booster pump controller 0 cannot communicate due to communication faults in the inflation process, the normally closed electromagnetic valve 5 is in a normally closed state, and the normally open electromagnetic valve 3 is in a normally open state, so that the brake system is not affected.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The system and the method for detecting the air tightness of the high-voltage device of the electric automobile are characterized in that the detection system comprises a brake booster pump controller, a brake booster pump, an overflow valve, a normally open electromagnetic valve, a dryer, a normally closed electromagnetic valve, an air pressure sensor, a box body, a high-voltage component controller and a connecting pipeline; the brake booster pump is connected with the overflow valve, the normally open electromagnetic valve and the dryer through connecting pipelines, the dryer is connected with the normally closed electromagnetic valve arranged in the box body, and the box body is internally provided with the air pressure sensor and the high-pressure component controller; the brake booster pump controller controls the booster pump to be opened and closed according to the state of the brake system, and the dryer is connected with the box bodies through connecting pipelines;
the brake booster pump pumps air of the brake vacuum tank to inflate the box body so as to increase the air pressure of the box body; the normally open electromagnetic valve and the normally closed electromagnetic valve are opened and closed to determine the flow direction of the gas, and the gas flows to the box body or flows back to the atmosphere; the overflow valve plays a role in protection and prevents the damage of a pump, a pipeline or a box body caused by overhigh pipeline pressure; the air pressure sensor converts air pressure into an analog electric signal; the high-voltage component controller collects analog electric signals of the air pressure sensor, calculates a current air pressure value in real time, controls the opening or closing of the normally closed electromagnetic valve according to the air pressure state and the states of the pump fed back by the booster pump controller and the normally open electromagnetic valve, judges the sealing state of the current box body according to the change situation of the air pressure value after the normally closed electromagnetic valve is closed, evaluates the air tightness of the box body, and reports the air tightness.
2. The system and the method for detecting the air tightness of the high-voltage device of the electric automobile according to claim 1 are characterized in that the detection method specifically comprises the following steps:
after the power pump controller and each high-voltage component controller are initialized, the power pump controller controls the power pump to be turned on and off according to the state requirement of the brake system;
the high-pressure component controller respectively detects the air pressure value of each box body, if the air pressure value is lower than P0, an inflation request is sent to the booster pump controller, the booster pump controller makes an inflation allowance response to one inflation request according to the working state of the booster pump and the load condition of the booster pump, and the other inflation allowance response is a rejection state; closing the normally open switch valve, opening the normally closed electromagnetic valve when the allowed high-pressure component controller receives an inflation allowing response, allowing the waste gas discharged from the booster pump to enter the box body through the drier and the opened normally closed electromagnetic valve, closing the normally closed electromagnetic valve when the pressure in the box body reaches a set value P0, sending inflation completion to the booster pump controller, opening the normally closed electromagnetic valve when the booster pump controller receives the inflation completion and if no inflation request sent by the controller exists, discharging the waste gas into the atmosphere, and performing the next inflation cycle if other inflation requests exist;
after the air pressure value in the box body reaches a set value, the high-pressure component controller closes the normally closed electromagnetic valve, timing is started, after a set time, the speed of reducing the air pressure value is calculated, if the pressure drop speed is smaller than the set value, the box body is considered to have no air tightness risk, and if the pressure drop speed is larger than the set value, the risk is reported to exist for a driver to refer and process;
the method comprises the steps that a booster pump controller always detects the air pressure in a vacuum tank in the process of inflating a tank body, when the detected air pressure reaches a booster pump stopping condition, the booster pump controller sends a booster pump stopping working state to a high-pressure part controller which is inflating, after the high-pressure part controller receives state information, a normally closed electromagnetic valve is closed, the current pressure state of the tank body is kept, an inflation request is continuously sent to the booster pump controller, and the next time the booster pump controller is inflated to allow response to continue inflating is waited;
if the communication fault in the inflation process causes that the high-pressure component controller and the booster pump controller cannot communicate with each other, the normally closed electromagnetic valve is in a normally closed state, and the normally open electromagnetic valve is in a normally open state, so that the brake system is not affected.
3. The system and the method for detecting the air tightness of the high-voltage device of the electric automobile according to claim 1 are characterized in that the dryer is respectively connected with a normally closed solenoid valve I in a box body I, a normally closed solenoid valve II in a box body II, a normally closed solenoid valve III in a box body III, a normally closed solenoid valve IV in a box body IV and a normally closed solenoid valve N in a box body N through connecting pipelines.
4. The system and the method for detecting the air tightness of the high-voltage device of the electric automobile according to any one of claims 1 or 3, wherein a first normally closed electromagnetic valve, a first air pressure sensor and a first high-voltage component controller are arranged in a first box body; a normally closed solenoid valve II, an air pressure sensor II and a high-pressure component sensor I are arranged in the box body II; a normally closed solenoid valve III, an air pressure sensor III and a high-pressure component controller II are arranged in the box body III; a normally closed solenoid valve IV, an air pressure sensor IV and a high-pressure component sensor II are arranged in the box body IV; a normally closed electromagnetic valve N, an air pressure sensor N and a high-pressure component controller N are arranged in the box body N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010253762.8A CN111238745A (en) | 2020-04-02 | 2020-04-02 | System and method for detecting air tightness of high-voltage device of electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010253762.8A CN111238745A (en) | 2020-04-02 | 2020-04-02 | System and method for detecting air tightness of high-voltage device of electric automobile |
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| CN111238745A true CN111238745A (en) | 2020-06-05 |
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| CN202010253762.8A Withdrawn CN111238745A (en) | 2020-04-02 | 2020-04-02 | System and method for detecting air tightness of high-voltage device of electric automobile |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112304771A (en) * | 2020-09-11 | 2021-02-02 | 山东泰展机电科技股份有限公司 | Air pump electromagnetic valve core sorting system and working method thereof |
| CN113830049A (en) * | 2021-09-26 | 2021-12-24 | 浙江吉利控股集团有限公司 | Vacuum air pressure composite compensation system and vehicle |
| CN114414171A (en) * | 2022-01-24 | 2022-04-29 | 中山市铧禧电子科技有限公司 | Water purifier detection method |
| CN114485022A (en) * | 2020-10-27 | 2022-05-13 | 海信（山东）冰箱有限公司 | Refrigerator with a door |
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2020
- 2020-04-02 CN CN202010253762.8A patent/CN111238745A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112304771A (en) * | 2020-09-11 | 2021-02-02 | 山东泰展机电科技股份有限公司 | Air pump electromagnetic valve core sorting system and working method thereof |
| CN112304771B (en) * | 2020-09-11 | 2023-04-07 | 山东泰展机电科技股份有限公司 | Air pump electromagnetic valve core sorting system and working method thereof |
| CN114485022A (en) * | 2020-10-27 | 2022-05-13 | 海信（山东）冰箱有限公司 | Refrigerator with a door |
| CN114485022B (en) * | 2020-10-27 | 2023-10-10 | 海信冰箱有限公司 | Refrigerator with a refrigerator body |
| CN113830049A (en) * | 2021-09-26 | 2021-12-24 | 浙江吉利控股集团有限公司 | Vacuum air pressure composite compensation system and vehicle |
| CN113830049B (en) * | 2021-09-26 | 2022-07-15 | 浙江吉利控股集团有限公司 | Vacuum air pressure composite compensation system and vehicle |
| CN114414171A (en) * | 2022-01-24 | 2022-04-29 | 中山市铧禧电子科技有限公司 | Water purifier detection method |
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Application publication date: 20200605 |