CN110206720A - A kind of electric car electric vacuum pump durability test apparatus and test method - Google Patents
A kind of electric car electric vacuum pump durability test apparatus and test method Download PDFInfo
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- CN110206720A CN110206720A CN201910383052.4A CN201910383052A CN110206720A CN 110206720 A CN110206720 A CN 110206720A CN 201910383052 A CN201910383052 A CN 201910383052A CN 110206720 A CN110206720 A CN 110206720A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a kind of electric car electric vacuum pump durability test apparatus and test methods, belong to electric vehicle engineering field.Present invention aim to address existing endurance tests to be only capable of the problem of providing maximum functional number and working life, propose a kind of vacuum pump of electric automobile durability test apparatus and test method, can really simulate whole electric vehicle service condition as far as possible, to obtain increasing with vacuum pump work times, the situation of change of performance parameter.By electric vacuum pump, the connecting component in real vehicle is copied to test room environmental to the present invention completely, simultaneously, vacuum booster in vacuum servo pipeline in real vehicle environment is replaced with into a solenoid valve, to accelerate releasing for vacuum degree in vacuum boost system, shorten electric vacuum pump run twice between interval time, lifting test efficiency substitutes vacuum booster with solenoid valve, it is also avoided that huge energy spent by operation vacuum vacuum booster simultaneously, reduces experimentation cost.
Description
Technical field
The invention belongs to electric vehicle engineering field, it is related to a kind of electric car electric vacuum pump durability test apparatus and phase
Close endurance test method.
Background technique
For pure electric automobile, can braking vacuum servo force system keep certain vacuum degree in real time, so that driver
Brake vehicle can be smoothly stepped on, it is significant to the safety traffic for guaranteeing vehicle.Electric vehicle is different from conventional fuel oil car,
There is no motor intake manifold vacuum degree to provide vacuum source, the vacuum degree of brake assist system is entirely from Motorized vacuum
Pump, the functional reliability of electric vacuum pump directly influence the reliability of braking system.Although electric vacuum pump is in certain tradition
Have equipment on fuel vehicle, but be also to be used as a back-up device, the work frequency is lower, and brake of electric vehicle vacuum entirely from
The work frequency of electric vacuum pump, electric vacuum pump is higher, it is therefore necessary to after obtaining its high frequency time use by endurance test
Performance parameter, carry out diagnosis for vehicle and the exploitation of related defencive function provide foundation.
Certain well-known electric vacuum pump producers can provide some endurance test information, but only provide maximum functional number
And working life, be not provided with the dampening information after vacuum pump performance increases with work times has for main engine plants
Necessity obtains the endurance test performance of this component, provides data for the diagnosis and vehicle traffic safety of brake vacuum associated components
Support.Therefore an electric vacuum pump durability experiment device similar with vehicle use environment and use condition, meaning weight are developed
Greatly.
Summary of the invention
Present invention aim to address existing endurance tests to be only capable of the problem of providing maximum functional number and working life,
A kind of vacuum pump of electric automobile durability test apparatus and test method are proposed, it is whole can really simulate electric vehicle as far as possible
Vehicle service condition, to obtain increasing with vacuum pump work times, the situation of change of performance parameter.
Have the technical solution of other electric vacuum pump durability test apparatus at present, but these schemes, how much all exist
Some problems all cannot really simulate use environment of the vacuum pump on real vehicle as far as possible, when by increasing vacuum pump work
The frequency causes come when carrying out endurance test, more or less with real vehicle operating status difference occurs for the working condition of vacuum pump itself
The actual vacuum pump endurance test data portion distortion got；The vacuum pump durability test apparatus that number of the present invention is addressed, to the greatest extent may be used
Real vehicle use environment can be simulated, really to obtain endurance test data as reliable as possible；
Of the invention is achieved through the following technical solutions:
A kind of vacuum pump of electric automobile durability test apparatus, by electric vacuum pump 1, check valve 2, vacuum tube I 3, vacuum tube
II 4, vacuum air storage tank 5, vacuum sensor 6, two three-way electromagnetic valves 7, filter 8, temperature sensor 9, cooling device 10, control
And data storage cell 11 forms.
Electric vacuum pump 1 is connected through vacuum tube I 3 with check valve 2, a branch and vacuum of the check valve 2 through vacuum tube II 4
Air accumulator 5 is connected；The vacuum sensor 6 is installed in vacuum air storage tank 5, for detecting the air in vacuum air storage tank 5
Pressure；Two three-way electromagnetic valve 7 is connected through another branch of vacuum tube II 4 with vacuum air storage tank 5, enters vacuum gas storage for controlling
The air capacity of tank；
8 one end of filter is connected through vacuum tube II 4 with two three-way electromagnetic valves 7, and another termination atmosphere is used for flowing through two energizations
The air of magnet valve 7 is filtered；The temperature sensor 9 is installed on electric vacuum pump 1, for detecting electric vacuum pump 1
Temperature, the cooling device 10 guarantee that the temperature of electric vacuum pump 1 is no more than real vehicle for cooling down to electric vacuum pump 1
Temperature when use；
The control and storage unit 11 are responsible for receiving the vacuum degree in the vacuum air storage tank 5 that vacuum sensor 6 acquires,
And the opening and closing of two three-way electromagnetic valves 7 are controlled with this, guarantee vacuum air storage tank 5 in vacuum degree within the scope of P1~P2,
Control and storage unit 11 will record the duration that two three-way electromagnetic valves 7 are opened every time, be greater than threshold value when opening the duration
Tm2, then it is assumed that filter 8 has blocking.
The strainability of vacuum filter 8 should be consistent with the filter strainability in vacuum booster on vehicle, to protect
The air quality that card enters electric vacuum pump is consistent with practical automobile-used environment.
The form of the cooling device 10 is the various electronic cooling devices including electric fan.
Actual internal area selection principle is when two three-way electromagnetic valves 7 are opened, it should be ensured that when its opening is so that vacuum air storage tank 5
The vacuum degree thresholding P2 that stops working from electric vacuum pump 1 of pressure be changed to the vacuum degree thresholding P1 of the start-up operation of vacuum pump 1
When, time-consuming is not less than 5 seconds, in favor of accurately controlling the vacuum degree in vacuum air storage tank 5；
Control and storage unit 11 connect electric vacuum pump 5 simultaneously, and determine control according to the vacuum degree in vacuum air storage tank 5
The work and stopping of electric vacuum pump 1 processed；Control and storage unit 11 are responsible for receiving the electric vacuum pump that temperature sensor 9 acquires
1 temperature, after the operating temperature of electric vacuum pump 1 is more than a threshold value, control and storage unit 11 pass through the cooling dress of control
10 unlatchings are set, the temperature of electric vacuum pump 1 is controlled below certain temperature.
Test method:
1) vacuum degree of 6 period of vacuum sensor acquisition vacuum air storage tank 5, opens two three-way electromagnetic valves 7；
2) when vacuum degree is lower than threshold value P1, two three-way electromagnetic valves 7 are closed；It is two logical that control and storage unit 11 record this
7 working time of solenoid valve determines that filter 8 has blocking if the time is more than Tm2, closes two three-way electromagnetic valves 7 and Motorized vacuum
Pump 1 terminates test；If the time is less than Tm2,1 temperature of electric vacuum pump is acquired by temperature sensor 9 after delay 1 second；
3) if 1 temperature of electric vacuum pump is higher than operating temperature highest limit value Tr1, then it is assumed that 1 temperature mistake of electric vacuum pump
Height opens cooling device 10, and resurveys 1 temperature of electric vacuum pump；If 1 temperature of electric vacuum pump is minimum lower than operating temperature
Limit value Tr2, then it is assumed that 1 temperature of electric vacuum pump is normal, closes cooling device, while obtaining electric vacuum pump 1 and last time closing
Time interval.
4) if the time interval that electric vacuum pump 1 and last time close is less than Tm3, rejudges after delay and closed with last time
Time interval；If the time interval that electric vacuum pump 1 and last time close is more than or equal to Tm3, electric vacuum pump 1 is opened,
Increase once in counter in control and storage unit 11, starts simultaneously at the record vacuum collected of vacuum sensor 6 storage
The vacuum degree data of gas tank 5, and record the operating time of electric vacuum pump 1；
5) when the vacuum degree of vacuum air storage tank 5 is more than or equal to threshold value P2, and the operating time of electric vacuum pump 1 is less than
When Tm1, then close electric vacuum pump 1, after delay 1 second, judge electric vacuum pump 1 work times whether be 5000 integer
Times；When the vacuum degree of vacuum air storage tank 5 is less than threshold value P2, and the operating time of electric vacuum pump 1 is more than or equal to Tm1, recognize
For vacuum pump performance slump of disastrous proportions, two three-way electromagnetic valves 7 and electric vacuum pump 1 are closed by control and the control of storage unit 11, terminated
Test；
6) carry out leak detection if the work times of electric vacuum pump 1 are 5000 integral multiple, leak if it exists by
Two three-way electromagnetic valves 7 and electric vacuum pump 1 are closed in control and the control of storage unit 11, terminate test；If the work of electric vacuum pump 1
Number is not 50000 integral multiple, or there is no leakages then to reopen two three-way electromagnetic valves 7, return step 1).
Beneficial effects of the present invention:
By electric vacuum pump, the connecting component in real vehicle is copied to test room environmental to the present invention completely, meanwhile, by real vehicle ring
The vacuum booster in vacuum servo pipeline in border replaces with a solenoid valve, to accelerate vacuum degree in vacuum boost system
Release, shorten electric vacuum pump run twice between interval time, lifting test efficiency replaces vacuum booster with solenoid valve
Generation, while being also avoided that huge energy spent by operation vacuum booster, experimentation cost is reduced, meanwhile, in order to as true as possible
The characteristic of real simulation vacuum booster, the present invention be provided with before electromagnetic valve entrance one with filtered in real vehicle vacuum booster
The identical filter of system filter capacity, to guarantee that the air purity for entering vacuum servo pipeline is consistent with real vehicle environment；
In order to avoid influence of the test piping connection to electric vacuum pump endurance test, after the every certain number of operation of electric vacuum pump, just
It carries out a test the leak detection of pipeline, pipeline leakage is avoided to cause the failure entirely tested；Meanwhile in order to avoid filter
Blocking causes vacuum boost system vacuum degree to reduce slow influence test efficiency, to filtering when two three-way electromagnetic valves open work every time
The stopping state of device is detected, so that experimenter replaces in time after plugged filter.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of electric car electric vacuum pump durability test apparatus described in the invention patent；
Fig. 2 is electric car electric vacuum pump endurance test method flow chart described in the invention patent.
Fig. 3 is electric vacuum pump each run time and vacuum air storage tank vacuum degree and vacuum pump work in the invention patent
The relation schematic diagram of number；
Fig. 4 is the relation schematic diagram of electric vacuum pump single operating time and work times in the invention patent；
Appended drawing reference: 1 is electric vacuum pump, and 2 be check valve, and 3 be vacuum tube I, and 4 be vacuum tube II, and 5 be vacuum gas storage
Tank, 6 be vacuum sensor, and 7 be two three-way electromagnetic valves, and 8 be filter, and 9 be temperature sensor, and 10 be cooling device, and 11 be control
System and data storage cell.
Specific embodiment
As shown in Figure 1, a kind of vacuum pump of electric automobile durability test apparatus, by electric vacuum pump 1, check valve 2, vacuum tube
I 3, vacuum tube II 4, vacuum air storage tank 5, vacuum sensor 6, two three-way electromagnetic valves 7, filter 8, temperature sensor 9, cooling dress
It sets 10, control and data storage cell 11 forms.
Electric vacuum pump 1 is connected through vacuum tube I 3 with check valve 2, a branch and vacuum of the check valve 2 through vacuum tube II 4
Air accumulator 5 is connected；The vacuum sensor 6 is installed in vacuum air storage tank 5, for detecting the air in vacuum air storage tank 5
Pressure；Two three-way electromagnetic valve 7 is connected through another branch of vacuum tube II 4 with vacuum air storage tank 5, enters vacuum gas storage for controlling
The air capacity of tank；
When electric vacuum pump 1 works, air in vacuum air storage tank 5 is extracted out, certain vacuum degree is reached；Individual event valve
2 for limiting the flow direction of air, and air can only be flowed to from vacuum air storage tank 5 works as electric vacuum pump 1, and cannot be from electric vacuum pump
1 flows to vacuum air storage tank 5；
8 one end of filter is connected through vacuum tube II 4 with two three-way electromagnetic valves 7, another termination atmosphere, for flowing through two energizations
The air of magnet valve 7 is filtered；The temperature sensor 9 is installed on electric vacuum pump 1, for detecting electric vacuum pump 1
Temperature, the cooling device 10 guarantee that the temperature of electric vacuum pump 1 is no more than real vehicle for cooling down to electric vacuum pump 1
Temperature when use；
The control and storage unit 11 are responsible for receiving the vacuum degree in the vacuum air storage tank 5 that vacuum sensor 6 acquires,
And the opening and closing of two three-way electromagnetic valves 7 are controlled with this, guarantee vacuum air storage tank 5 in vacuum degree within the scope of P1~P2,
Control and storage unit 11 will record the duration that two three-way electromagnetic valves 7 are opened every time, be greater than threshold value when opening the duration
Tm2, then it is assumed that filter 8 has blocking.
The strainability of vacuum filter 8 should be consistent with the filter strainability in vacuum booster on vehicle, to protect
The air quality that card enters electric vacuum pump is consistent with practical automobile-used environment.
The form of the cooling device 10 is the various electronic cooling devices including electric fan.
Actual internal area selection principle is when two three-way electromagnetic valves 7 are opened, it should be ensured that when its opening is so that vacuum air storage tank 5
The vacuum degree thresholding P2 that stops working from electric vacuum pump 1 of pressure be changed to the vacuum degree thresholding P1 of the start-up operation of vacuum pump 1
When, time-consuming is not less than 5 seconds, in favor of accurately controlling the vacuum degree in vacuum air storage tank 5；
Test method specific steps in the present embodiment are as shown in Fig. 2, specific as follows:
1) vacuum sensor 6 acquires the vacuum degree of vacuum air storage tank 5 using 50ms as the period, opens two three-way electromagnetic valves 7；
2) when vacuum degree is lower than threshold value P1, two three-way electromagnetic valves 7 are closed；It is two logical that control and storage unit 11 record this
7 working time of solenoid valve determines that filter 8 has blocking if the time is more than Tm2, closes two three-way electromagnetic valves 7 and Motorized vacuum
Pump 1 terminates test；If the time is less than Tm2,1 temperature of electric vacuum pump is acquired by temperature sensor 9 after delay 1 second；
3) if 1 temperature of electric vacuum pump is higher than operating temperature highest limit value Tr1, then it is assumed that 1 temperature mistake of electric vacuum pump
Height opens cooling device 10, and resurveys 1 temperature of electric vacuum pump；If 1 temperature of electric vacuum pump is minimum lower than operating temperature
Limit value Tr2, then it is assumed that 1 temperature of electric vacuum pump is normal, closes cooling device, while obtaining electric vacuum pump 1 and last time closing
Time interval.
4) if the time interval that electric vacuum pump 1 and last time close is less than (5 seconds) Tm3, rejudged after delay with it is upper
The time interval of secondary closing；If the time interval that electric vacuum pump 1 and last time close is more than or equal to (5 seconds) Tm3, open electronic
Vacuum pump 1 increases once in the counter in control and storage unit 11, starts simultaneously at and records vacuum with 200 millisecond periods
The vacuum degree data of the vacuum air storage tank 5 collected of sensor 6 are spent, and record the operating time (second) of electric vacuum pump 1；
5) when the vacuum degree of vacuum air storage tank 5 is more than or equal to threshold value P2, and the operating time of electric vacuum pump 1 is less than
When Tm1 (20s), then close electric vacuum pump 1 judges whether the work times of electric vacuum pump 1 are 5000 after delay 1 second
Integral multiple；When the vacuum degree of vacuum air storage tank 5 is less than P2, and the operating time of electric vacuum pump 1 is more than or equal to Tm1 (20s),
Think vacuum pump performance slump of disastrous proportions, two three-way electromagnetic valves 7 and electric vacuum pump 1, knot are closed by control and the control of storage unit 11
Beam test, the determination method of electric vacuum pump longest working time Tm1 are to randomly select that 5 offline and that state is intact is electronic
Vacuum pump, every electric vacuum pump cumulative operation time are more than after ten minutes, to measure this 5 electric vacuum pumps for system vacuum
It is evacuated to average time spent by P2 from P1, by this average time multiplied by 1.5 times, as the electric vacuum pump longest working time
Tm1；
6) carry out leak detection if the work times of electric vacuum pump 1 are 5000 integral multiple, leak if it exists by
Two three-way electromagnetic valves 7 and electric vacuum pump 1 are closed in control and the control of storage unit 11, terminate test；If the work of electric vacuum pump 1
Number is not 5000 integral multiple, or there is no leakages then to reopen two three-way electromagnetic valves 7, return step 1).
7 working time of two three-way electromagnetic valves threshold T m2 for 8 jam detection of filter needs the circulation according to solenoid valve
Area and vacuum air storage tank volume and vacuum air storage tank vacuum ranges are set.The 7 longest working time of two three-way electromagnetic valves
The determination method of limit value Tm2 is that, for fixed two three-way electromagnetic valve, measurement is after its opening, the vacuum degree of vacuum air storage tank
It is reduced to 10 average values of the spent time of P1 from P2, this 10 times are averagely expended the time multiplied by 1.2, as Tm2's
Value.
After the setting of threshold pressure P1 and P2 depend on vacuum pump loading operation, what braking department proposed is meeting braking
Under the premise of it is required that, the upper lower limit value of the vacuum degree kept needed for vacuum boost system, this is also the Motorized vacuum in real vehicle operation
Pump opens the vacuum degree upper lower limit value in work and the vacuum boost system to stop working；
Guarantee during endurance test, the temperature of vacuum pump 1 is no more than temperature limit Tr1, and the setting of Tr1 depends on
Real vehicle run when, object run area with target operating condition when driving, the maximum temperature that vacuum pump can reach, temperature limit
The difference of Tr1 and Tr2 should be greater than 3 degrees Celsius.
After test stops, according to the data recorded during endurance test, correlation graph is drawn, including with number of run
Increase, the three-dimensional curve of each run time and the variation of 5 vacuum degree of vacuum air storage tank, as shown in Figure 3；And work times and list
The X-Y scheme of task duration, as shown in Figure 4；
According to the parameter setting of this durability experiment device, one duty cycle time-consuming of electric vacuum pump about 15 seconds or so, one
It runs 240 times within a hour；By taking 200,000 kilometers of quality guarantees of electric vacuum pump as an example, average hundred kilometers of vacuum pump access times are about 250
It is secondary, then 200,000 kilometers of 500,000 tests are completed, endurance test needs can be completed within about 90 days, illustrates this durability test apparatus
Efficiency or very high；In addition, include check valve in this endurance test pipeline, it, can be periodically to system during endurance test
Leakproofness is tested, the sealing including check valve, therefore this durability test apparatus can also realize the durable examination to check valve
Test examination；Meanwhile this durability test apparatus has used filter device and temperature control equipment as real vehicle, ensure that vacuum
The working condition of pump is consistent as far as possible with real vehicle, improves the confidence level of endurance test.
Claims (2)
1. a kind of vacuum pump of electric automobile durability test apparatus, which is characterized in that the device is by electric vacuum pump (1), check valve
(2), vacuum tube I (3), vacuum tube II (4), vacuum air storage tank (5), vacuum sensor (6), two three-way electromagnetic valves (7), filter
(8), temperature sensor (9), cooling device (10), control and data storage cell (11) composition；
Electric vacuum pump (1) is connected through vacuum tube I (3) with check valve (2), a branch of the check valve (2) through vacuum tube II (4)
It is connected with vacuum air storage tank (5)；The vacuum sensor (6) is installed on vacuum air storage tank (5), for detecting vacuum gas storage
Air pressure in tank (5)；Two three-way electromagnetic valve (7) is connected through another branch of vacuum tube II (4) with vacuum air storage tank (5),
For controlling the air capacity for entering vacuum air storage tank；
Filter (8) one end is connected through vacuum tube II (4) with two three-way electromagnetic valves (7), and another termination atmosphere is used for logical to flowing through two
The air of solenoid valve (7) is filtered；The temperature sensor (9) is installed on electric vacuum pump (1), electronic true for detecting
The temperature of sky pump (1), the cooling device (10) guarantee electric vacuum pump (1) for cooling down to electric vacuum pump (1)
Temperature is no more than temperature when real vehicle uses；
The control and storage unit (11) are responsible for receiving the vacuum in the vacuum air storage tank (5) of vacuum sensor (6) acquisition
It spends, and controls the opening and closing of two three-way electromagnetic valves (7) with this, guarantee the vacuum degree in vacuum air storage tank (5) in P1~P2
In range, control and storage unit (11) will record the duration that two three-way electromagnetic valves (7) are opened every time, when the unlatching duration
Greater than threshold T m2, then it is assumed that filter (8) has blocking；
The strainability of vacuum filter (8) should be consistent with the filter strainability in vacuum booster on vehicle, to guarantee
The air quality for entering electric vacuum pump is consistent with practical automobile-used environment；
The form of the cooling device (10) is the various electronic cooling devices including electric fan；
Actual internal area selection principle is when two three-way electromagnetic valves (7) are opened, it should be ensured that when its opening is so that vacuum air storage tank (5)
The vacuum degree thresholding P2 that stops working from electric vacuum pump (1) of pressure be changed to the vacuum degree door of vacuum pump (1) start-up operation
When limiting P1, time-consuming is not less than 5 seconds, in favor of accurately controlling the inner vacuum degree of vacuum air storage tank (5)；
Control and storage unit (11) connect electric vacuum pump (5) simultaneously, and are determined according to the vacuum degree in vacuum air storage tank (5)
Control the work and stopping of electric vacuum pump (1)；Control and storage unit (11) are responsible for receiving the electricity of temperature sensor (9) acquisition
The temperature of dynamic vacuum pump (1), after the operating temperature of electric vacuum pump (1) is more than a threshold value, control and storage unit (11)
It is opened by control cooling device (10), the temperature of electric vacuum pump (1) is controlled below certain temperature.
2. the test method of vacuum pump of electric automobile durability test apparatus as described in claim 1, the specific steps are as follows:
1) vacuum degree of vacuum sensor (6) period acquisition vacuum air storage tank (5) is opened two three-way electromagnetic valves (7)；
2) it when vacuum degree is lower than threshold value P1, closes two three-way electromagnetic valves (7)；It is two logical that control and storage unit (11) record this
Solenoid valve (7) working time determines that filter (8) has blocking if the time is more than Tm2, closes two three-way electromagnetic valves (7) and electricity
Dynamic vacuum pump (1) terminates test；If the time is less than Tm2, Motorized vacuum is acquired by temperature sensor (9) after delay 1 second
Pump (1) temperature；
3) if electric vacuum pump (1) temperature is higher than operating temperature highest limit value Tr1, then it is assumed that electric vacuum pump (1) temperature mistake
Height is opened cooling device (10), and resurveys electric vacuum pump (1) temperature；If electric vacuum pump (1) temperature is lower than work temperature
Spend minimum limit value Tr2, then it is assumed that electric vacuum pump (1) temperature is normal, closes cooling device, while obtaining electric vacuum pump (1)
The time interval closed with last time；
4) if the time interval that electric vacuum pump (1) and last time close is less than Tm3, rejudged after delay and last time closing
Time interval；If the time interval that electric vacuum pump (1) and last time close is more than or equal to Tm3, open electric vacuum pump (1),
Increase once in the counter in control and storage unit (11), it is collected to start simultaneously at record vacuum sensor (6)
The vacuum degree data of vacuum air storage tank (5), and record the operating time of electric vacuum pump (1)；
5) when the vacuum degree of vacuum air storage tank (5) is more than or equal to threshold value P2, and the operating time of electric vacuum pump (1) is less than
When Tm1, then close electric vacuum pump (1), delay 1 second after, judge electric vacuum pump (1) work times whether be 5000 it is whole
Several times；When vacuum air storage tank (5) vacuum degree be less than threshold value P2, and the operating time of electric vacuum pump (1) be more than or equal to Tm1
When, it is believed that vacuum pump performance slump of disastrous proportions closes two three-way electromagnetic valves (7) and Motorized vacuum by control and storage unit (11) control
It pumps (1), terminates test；
6) leak detection is carried out if the work times of electric vacuum pump (1) are 5000 integral multiple, is leaked if it exists by controlling
Two three-way electromagnetic valves (7) and electric vacuum pump (1) are closed in system and storage unit (11) control, terminate test；If electric vacuum pump (1)
Work times be not 50000 integral multiple, or there is no leakage then reopen two three-way electromagnetic valves (7), return step 1).
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| CN111815805A (en) * | 2020-07-03 | 2020-10-23 | 中国第一汽车股份有限公司 | Vacuum pump working performance judgment method and device, vehicle and storage medium |
| CN113295939A (en) * | 2021-03-29 | 2021-08-24 | 一汽奔腾轿车有限公司 | Vacuum pump electromagnetic compatibility test system and control method thereof |
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