CN109026484A - The control system of automotive air induction duct formula fuel injector on-line checking platform - Google Patents
The control system of automotive air induction duct formula fuel injector on-line checking platform Download PDFInfo
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- CN109026484A CN109026484A CN201810766904.3A CN201810766904A CN109026484A CN 109026484 A CN109026484 A CN 109026484A CN 201810766904 A CN201810766904 A CN 201810766904A CN 109026484 A CN109026484 A CN 109026484A
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- fuel injector
- oil
- ejection medium
- control system
- induction duct
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- 239000000446 fuel Substances 0.000 title claims abstract description 117
- 230000006698 induction Effects 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000012360 testing method Methods 0.000 claims abstract description 29
- 238000012544 monitoring process Methods 0.000 claims abstract description 24
- 239000002828 fuel tank Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 239000007921 spray Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/001—Measuring fuel delivery of a fuel injector
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/006—Measuring or detecting fuel leakage of fuel injection apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The present invention relates to a kind of control systems of automotive air induction duct formula fuel injector on-line checking platform, including PLC, ejection medium level monitoring and liquid supply device, ejection medium pressure control device, oil route controller, ejection medium level monitoring and liquid supply device, ejection medium pressure control device, oil route controller are controlled by PLC.While ejection medium level monitoring and liquid supply device are by ejection medium pressure control device and oil route controller, the liquid level of ejection medium level monitoring and liquid supply device is also adjusted.Control device provided by the invention meets the experimental condition of domestic and international automotive air induction duct formula fuel injector detection, realize scientific, the accurate detection of automotive air induction duct formula fuel injector performance, the test to air inlet flue type fuel injector multifrequency nature is realized using advanced sensor technology by optimization design.
Description
Technical field
The invention belongs to gauge check fields, are related to automatic technology, and especially a kind of automotive air induction duct formula fuel injector exists
The control system of line detection platform.
Background technique
Automobile fuel injector is the important component of automobile engine, and whether working characteristics reaches job requirement, directly
Affect the working characteristics of automobile engine.Therefore, in the production link of automobile fuel injector, it is necessary to directly carry out essence to it
Quasi- test.
Currently, " the SAE J1832-2001Low Pressure Gasoline that AIAE American institute of automobile engineers is promulgated
Fuel Injector"；" the GB/T 25363-2010 electromagnetic valve type oil sprayer for gasoline engine that Chinese mechanical industry federation proposes
Assembly test method "；The standards such as automobile industry standard " QC/T 967-2014 petrol engine air admission road injecting type fuel injector ", to vapour
The test environment of the automatically controlled air inlet flue type fuel injector of vehicle clearly requires.Whether test environment reaches test request, to oil spout
The accuracy of device detection has large effect.Therefore, in order to construct the standard environment for testing fuel injector, the standard of test is improved
Exactness, automotive air induction duct formula fuel injector on-line checking platform need a kind of reliable, stable, safety control system.
Summary of the invention
It is an object of the invention to provide the vapour that a kind of structure is simple, easily operated in place of overcome the deficiencies in the prior art
The control system of vehicle air inlet flue type fuel injector on-line checking platform.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
A kind of control system of automotive air induction duct formula fuel injector on-line checking platform, including PLC, ejection medium level monitoring
And liquid supply device, ejection medium pressure control device, oil route controller, ejection medium level monitoring and liquid supply device, injection
Pressure medium control device, oil route controller are controlled by PLC.Ejection medium level monitoring and liquid supply device pass through
Ejection medium pressure control device and while oil route controller, also adjusting ejection medium level monitoring and liquid supply device
Liquid level.
Moreover, the ejection medium level monitoring and liquid supply device include relay, oil pump, fuel tank, liquid level sensor and
Booster jar forms ejection medium level monitoring and liquid supply device, wherein fuel tank oil outlet and booster jar oiler pass through filter
It is connected, in liquid level sensor device and booster jar, oil pump device is connected in fuel tank internal and with relay, PLC and relay
Device connection.
Moreover, the ejection medium pressure control device includes electromagnetic proportional valve, air pump, booster jar, oil inlet common rail and pressure
Force snesor, wherein PLC is connected with electromagnetic proportional valve, pressure sensor, and electromagnetic proportional valve input port is connected with air pump,
Delivery outlet is connected with booster jar, and the oil outlet of booster jar is connected with oil inlet common rail, and pressure sensor is total for monitoring oil inlet
Ejection medium pressure in rail constitutes the closed loop control of ejection medium pressure with PLC, electromagnetic proportional valve, booster jar, oil inlet common rail
System.
Moreover, device air gauge and air oil water separator between the electromagnetic proportional valve and air pump, for monitoring gas
Pressure is separated with steam.
Moreover, the oil route controller includes six tunnel oil inlet solenoid valves, six road oil return solenoid valves, six tunnel oil inlet solenoid valves
It is connected with flowmeter and six fuel injectors；Six road oil return solenoid valves are connected with oil return common rail, PLC and six tunnel oil inlet electromagnetism
Valve, six road oil return solenoid valves are separately connected.
Moreover, each fuel injector is connected with a fuel injector driver respectively, fuel injector driving device, oil spout are constituted
Device driver can drive the operating condition of No. six fuel injectors simulation fuel injector idling, low speed, middling speed and high speed simultaneously, and acquisition is respectively
Class fuel injector status signal monitors fuel injector circuit break and short circuit failure.
Moreover, further including fuel injector drying device, including air solenoid valve, six road check valve check valves, six road check valves
Air inlet be connected on the air pipe line between air oil water separator and electromagnetic proportional valve by air solenoid valve, six tunnels
The gas outlet of check valve is located on the fuel feed pump below six tunnel oil inlet solenoid valves, for the fuel injector after dry test.
Moreover, further including fuel injector flow acquisition device, including pulse counter and flowmeter, for testing fuel injector
Discharge characteristic, between six tunnel oil inlet solenoid valves and oil inlet common rail, pulse counter is connected flowermeter with flowmeter,
Number of pulses based on metered flow.
Moreover, the ejection medium pressure control device, fuel injector driving device and fuel injector flow acquisition device, altogether
Hinder diagnostic device with event fuel injector is constituted, blocking or leakage failure occurs for testing fuel injector.
Moreover, including host computer, host computer is connected with fuel injector driver, PLC, pulse counter simultaneously, responsible pair
Control system links carry out real-time control and data sampling and processing and display.
The advantages and positive effects of the present invention are:
1, control device provided by the invention meets the experimental condition of domestic and international automotive air induction duct formula fuel injector detection, real
Scientific, the accurate detection for having showed automotive air induction duct formula fuel injector performance, by optimization design, using advanced sensor technology,
Realize the test to air inlet flue type fuel injector multifrequency nature.Ejection medium pressure, and the parameters of test fuel injector can be with
Voluntarily acquisition and processing, realize higher the degree of automation, reduce the complexity of test fuel injector process.
2, control device provided by the invention carries out ejection medium pressure control by the way of controlling gas volume, reduces
Pressure oscillation enhances the stability of fuel injector on-line checking platform using closed-loop control；Using liquid supply device, spray ensure that
Oily device on-line checking platform can improve its working efficiency in duration；Using fuel injector drying device, oil spout is realized
The integrality of the process of device on-line checking enhances the degree of automation of testing process.
Detailed description of the invention
Fig. 1 is the connection relationship diagram of the electric control part and executing agency in the present invention.
In Fig. 1,1 is fuel tank, and 2 be low pressure fuel pump, and 3 be filter, and 4 be relay, and 5 be air gauge, and 6 be air pump, and 7 are
Air oil water separator, 8 be electromagnetic proportional valve, and 9 be booster jar, and 10 be liquid level sensor, and 11 be oil inlet common rail, and 12 be oil inlet
Solenoid valve, 13 be flowmeter, and 14 be check valve, and 15 be fuel injector, and 16 be graduated cylinder, and 17 be oil return common rail, and 18 be pressure sensing
Device, 19 be oil return solenoid valve, and 20 be air solenoid valve, and 21 be host computer, and 22 be fuel injector driver, and 23 be pulse counter,
24 be PLC.
Specific embodiment
The invention will be further described with reference to the accompanying drawing and by specific embodiment, and following embodiment is descriptive
, it is not restrictive, this does not limit the scope of protection of the present invention.
A kind of control system of automotive air induction duct formula fuel injector on-line checking platform, including 1 fuel tank, 2 low pressure fuel pumps, 3 filters
Clear device, 4 relays, 5 air gauges, 6 air pumps, 7 air oil water separators, 8 electromagnetic proportional valves, 9 booster jars, 10 liquid level sensors,
11 oil inlet common rails, 12 6 tunnel oil inlet solenoid valves, 13 No. six flowmeters, 14 6 road check valves, 15 fuel injectors, 16 graduated cylinders, 17 oil returns
Common rail, 18 pressure sensors, 19 6 road oil return solenoid valves, 20 air solenoid valves, 21 host computers, 22 fuel injector drivers, 23 arteries and veins
Rush counter, 24PLC.
Above-mentioned 24PLC and 4 relays, 6 oil pumps, 1 fuel tank, 10 liquid level sensors and 9 booster jars form ejection medium liquid
Position monitoring and liquid supply device.Wherein, 1 fuel tank oil outlet is connected with 9 booster jar oilers by filter, for filtering spray
Penetrate medium.In 10 liquid level sensor devices and 9 booster jars, for monitoring the fluid level condition of ejection medium.2 low pressure fuel pump devices
In 1 fuel tank internal, it is connected with 4 relays, is controlled for ejection medium fluid infusion.
Above-mentioned 24PLC and 8 electromagnetic proportional valves, 6 air pumps, 9 booster jars, 11 oil inlet common rails and 18 pressure sensors are constituted
Ejection medium pressure control device.Wherein 24PLC is connected with 8 electromagnetic proportional valves, 18 pressure sensors.8 electromagnetic proportional valves are defeated
Entrance is connected with 6 air pumps, and delivery outlet is connected with 9 booster jars, for controlling the volume of gas in 9 booster jars.8 electromagnetism ratios
5 air gauge of device and 7 air oil water separators between example valve and 6 air pumps, separate for monitoring gas pressure with steam.9 pressurizations
The oil outlet of tank is connected with 11 oil inlet common rails, and 18 pressure sensors are used to monitor ejection medium pressure in 11 oil inlet common rails,
The closed-loop control of ejection medium pressure is constituted with 24PLC, 8 electromagnetic proportional valves, 9 booster jars, 11 oil inlet common rails.
Above-mentioned 24PLC and 12 6 tunnel oil inlet solenoid valves, 19 6 road oil return solenoid valves constitute oil route controller, for controlling
Make the working condition on six road binders roads.12 6 tunnel oil inlet solenoid valves are connected with 13 No. six flowmeters and 15 fuel injectors；19 6 tunnels are returned
Solenoid is connected with 17 oil return common rails.
Above-mentioned 24PLC and 20 air solenoid valves, 14 6 road check valves constitute fuel injector drying device, for dry test
15 fuel injectors afterwards.The air inlet of 14 6 road check valves is connected to 7 air oil water separators and 8 electricity by 20 air solenoid valves
On air pipe line between magnetic proportioning valve, the gas outlet of 14 6 road check valves is located at below 12 6 tunnel oil inlet solenoid valves
On fuel feed pump, for 15 fuel injectors after dry test.
Above-mentioned 22 fuel injector driver is connected with 15 fuel injectors, constitutes 15 fuel injector driving devices, is responsible for simulation oil spout
A variety of different operating conditions such as device idling, low speed, middling speed and high speed, and all kinds of fuel injector status signals of acquisition, monitor fuel injector
Circuit break and short circuit failure, and No. six fuel injectors can be driven simultaneously.
Above-mentioned 23 pulse counter and 13 No. six flowmeters constitute fuel injector flow acquisition device, for testing fuel injector
Discharge characteristic (dynamic flow and quiescent flow).Six road flowermeters in 12 6 tunnel oil inlet solenoid valves and 11 oil inlet common rails it
Between, 23 pulse counters are connected with 13 No. six flowmeters, the number of pulses based on metered flow.
Above-mentioned ejection medium pressure control device, fuel injector driving device and fuel injector flow acquisition device, collectively form
Therefore fuel injector hinders diagnostic device, is responsible for whether test fuel injector occurs blocking or leakage failure.
Above-mentioned 21 host computer is connected with 22 fuel injector drivers, 24PLC, 23 pulse counters simultaneously, is responsible for control
System links carry out real-time control and data sampling and processing and display.
Steps are as follows for the control method of this control system:
(1) air pump is opened, fuel injector is installed, attach it in installation device of fuel injector and fuel injector drive is linked in sequence
Moving-wire.
(2) it turns on the power switch, starts control system, click in host computer screen " identification fuel injector " button, lead at this time
It crosses fuel injector driving device and acquires each fuel injector data, fuel injector type (voltage-type or electric current are identified by feedback data
Type), while feeding back the corresponding data of each fuel injector of host computer.
(3) " pressure setting " frame in host computer screen is clicked, pressure value needed for setting experiment is clicked " starting to pressurize " and pressed
Button, the pressure for controlling ejection medium is reached and is stablized in setup pressure value by ejection medium pressure control device at this time.Wherein PLC
Control ejection medium pressure control device, the algorithmic formula of use are as follows:
In formula: u (t) is output pressure value；KPFor proportionality coefficient；TiFor time of integration constant；TdFor derivative time constant；e
It (t) is the deviation of setup pressure value and actual pressure value.
If the sampling time is T, (1) formula discretization can be obtained at the k moment:
In formula:For integral coefficient；For differential coefficient.
It adjusts u (k), when e (t) is zero, so that control system adjusts and stablizes ejection medium pressure.It works in fuel injector
Control system will execute always this algorithm in the process, make its ejection medium pressure remained steady state.
(4) host computer screen " fault diagnosis " button is clicked, injector failures diagnostic device is started, fuel injector drives at this time
Device acquires ejection medium pressure and fuel injector spray respectively to the control signal per the input identical parameters of fuel injector all the way
Amount of jet information judges whether fuel injector occurs blocking or leakage according to ejection medium pressure and fuel injector injection flow information
Failure.And it records.
(5) host computer screen " parameter setting " button is clicked, input fuel injector flow characteristic test needs difference to be tested
Different operating conditions are finally ranked up by operating condition design parameter.
(6) " starting to test " button is clicked, starts pressure control device, fuel injector driving device will be according to (4) at this time
The operating condition Sequential output of step setting controls signal, carries out discharge characteristic test, after each working condition measurement, fuel injector flow
Acquisition device calculates fuel injector injection flow automatically, bent according to test result output flow characteristic after all working condition measurements
Line chart, and record.In discharge characteristic test process, real-time monitoring is acquired fuel injector status signal by fuel injector driving device.
(7) after testing, " drying " button is clicked, process is dried to fuel injector in fuel injector drying device at this time.
(8) " test terminates " button is clicked, each device work is stopped, every test data of record is formed into experiment report
It accuses.
(9) " printed report " button is clicked, laboratory report is exported.
Although disclosing the embodiment of the present invention and attached drawing for the purpose of illustration, those skilled in the art can be managed
Solution: do not departing from the present invention and spirit and scope of the appended claims in, various substitutions, changes and modifications be all it is possible,
Therefore, the scope of the present invention is not limited to the embodiment and attached drawing disclosure of that.
Claims (10)
1. a kind of control system of automotive air induction duct formula fuel injector on-line checking platform, including PLC, ejection medium level monitoring and
Liquid supply device, ejection medium pressure control device, oil route controller, ejection medium level monitoring and liquid supply device, injection are situated between
Matter pressure control device, oil route controller are controlled by PLC.Ejection medium level monitoring and liquid supply device pass through injection
While pressure medium control device and oil route controller, the liquid level of ejection medium level monitoring and liquid supply device is also adjusted.
2. the control system of automotive air induction duct formula fuel injector on-line checking platform according to claim 1, it is characterised in that:
The ejection medium level monitoring and liquid supply device include relay, oil pump, fuel tank, liquid level sensor and booster jar composition injection
Medium level monitoring and liquid supply device, wherein fuel tank oil outlet is connected with booster jar oiler by filter, level sensing
In device device and booster jar, oil pump device is connected in fuel tank internal and with relay, and PLC is connect with relay.
3. the control system of automotive air induction duct formula fuel injector on-line checking platform according to claim 1, it is characterised in that:
The ejection medium pressure control device includes electromagnetic proportional valve, air pump, booster jar, oil inlet common rail and pressure sensor, wherein
PLC is connected with electromagnetic proportional valve, pressure sensor, and electromagnetic proportional valve input port is connected with air pump, delivery outlet and booster jar
It is connected, the oil outlet of booster jar is connected with oil inlet common rail, and pressure sensor is for monitoring ejection medium pressure in oil inlet common rail
Power constitutes the closed-loop control of ejection medium pressure with PLC, electromagnetic proportional valve, booster jar, oil inlet common rail.
4. the control system of automotive air induction duct formula fuel injector on-line checking platform according to claim 1, it is characterised in that:
The oil route controller includes six tunnel oil inlet solenoid valves, six road oil return solenoid valves, six tunnel oil inlet solenoid valves and flowmeter and six
A fuel injector is connected；Six road oil return solenoid valves are connected with oil return common rail, PLC and six tunnel oil inlet solenoid valves, six tunnel oil return electricity
Magnet valve is separately connected.
5. the control system of automotive air induction duct formula fuel injector on-line checking platform according to claim 3, it is characterised in that:
Device air gauge and air oil water separator between the electromagnetic proportional valve and air pump, for monitoring gas pressure and steam point
From.
6. the control system of automotive air induction duct formula fuel injector on-line checking platform according to claim 4, it is characterised in that:
Each fuel injector is connected with a fuel injector driver respectively, constitutes fuel injector driving device, fuel injector driver can be same
When drive the operating condition of No. six fuel injectors simulation fuel injector idling, low speed, middling speed and high speed, and acquisition all kinds of fuel injector states letter
Number, monitor fuel injector circuit break and short circuit failure.
7. the control system of automotive air induction duct formula fuel injector on-line checking platform according to claim 5, it is characterised in that:
It further include fuel injector drying device, including air solenoid valve, six road check valve check valves, the air inlet of six road check valves pass through sky
Pneumoelectric magnet valve is connected on the air pipe line between air oil water separator and electromagnetic proportional valve, the gas outlet point of six road check valves
It Wei Yu not be on the fuel feed pump below six tunnel oil inlet solenoid valves, for the fuel injector after dry test.
8. the control system of automotive air induction duct formula fuel injector on-line checking platform according to claim 6, it is characterised in that:
It further include fuel injector flow acquisition device, including pulse counter and flowmeter, for testing the discharge characteristic of fuel injector, flow
Counter device is between six tunnel oil inlet solenoid valves and oil inlet common rail, and pulse counter is connected with flowmeter, based on metered flow
Number of pulses.
9. the control system of automotive air induction duct formula fuel injector on-line checking platform according to claim 8, it is characterised in that:
Ejection medium pressure control device, fuel injector driving device and the fuel injector flow acquisition device collectively forms event oil spout
Device hinders diagnostic device, and blocking or leakage failure occurs for testing fuel injector.
10. the control system of automotive air induction duct formula fuel injector on-line checking platform according to claim 1, feature exist
In: including host computer, host computer is connected with fuel injector driver, PLC, pulse counter simultaneously, is responsible for each to control system
A link carries out real-time control and data sampling and processing and display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810766904.3A CN109026484B (en) | 2018-07-13 | 2018-07-13 | Control system of on-line detection platform of automobile air inlet type oil sprayer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810766904.3A CN109026484B (en) | 2018-07-13 | 2018-07-13 | Control system of on-line detection platform of automobile air inlet type oil sprayer |
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| Publication Number | Publication Date |
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| CN109026484A true CN109026484A (en) | 2018-12-18 |
| CN109026484B CN109026484B (en) | 2023-09-29 |
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| CN201810766904.3A Active CN109026484B (en) | 2018-07-13 | 2018-07-13 | Control system of on-line detection platform of automobile air inlet type oil sprayer |
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| CN109695527A (en) * | 2019-01-24 | 2019-04-30 | 南通职业大学 | The instantaneous performance measurement system of Electrocontrolled high-pressure common rail fuel injection system and measurement method |
| CN111622878A (en) * | 2020-04-09 | 2020-09-04 | 一汽解放汽车有限公司 | Device and method for detecting leakage of matching part structure |
| CN112709655A (en) * | 2021-01-29 | 2021-04-27 | 湖北三宁化工股份有限公司 | Electric control high-pressure common rail system tightness detection device |
| RU2767671C1 (en) * | 2021-07-23 | 2022-03-18 | Общество с ограниченной ответственностью Управляющая компания "Алтайский завод прецизионных изделий" | Stand for testing and run-in nozzles |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109026484B (en) | 2023-09-29 |
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