CN108757253A - A kind of judgement fuel injector coherence method - Google Patents
A kind of judgement fuel injector coherence method Download PDFInfo
- Publication number
- CN108757253A CN108757253A CN201810547790.3A CN201810547790A CN108757253A CN 108757253 A CN108757253 A CN 108757253A CN 201810547790 A CN201810547790 A CN 201810547790A CN 108757253 A CN108757253 A CN 108757253A
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- Prior art keywords
- fuel injector
- rail pressure
- pressure value
- practical
- fuel
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Classifications
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- 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
- F02M65/003—Measuring variation of fuel pressure in high pressure line
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a kind of judgement fuel injector coherence methods, including steps are as follows, and S1, activation setting program pass through program setting target rail pressure value；S2, ECU control fuel metering valve and open, and common rail overpressure is made to reach preset target rail pressure value；S3, ECU control fuel metering valve and close, and activate one of fuel injector, make fuel injector to fix power-up time and spray fuel oil；S4, it is to be sprayed after record practical rail pressure value in common rail pipe, ask difference to obtain the practical drop-out value of the fuel injector practical rail pressure value and target rail pressure value；S5, by practical drop-out value compared with the standard drop-out value of standard injector, if practical drop-out value exceeds the margin of tolerance of standard drop-out value, the consistency of the fuel injector is poor；S6, step S2-S5 is repeated, judges the consistency of other each fuel injectors.The present invention can effectively judge the consistent sex differernce of each fuel injector of engine, ensure engine performance.
Description
Technical field
The present invention relates to fuel injector detection technique fields, more specifically, it relates to a kind of judgement fuel injector consistency side
Method.
Background technology
The injection system of engine is as shown in Figure 1, ECU controls fuel metering valve 4 to control the rail pressure of common rail pipe 1, common rail
High pressure oil in pipe 1 is transported to fuel injector 3 by high-pressure oil pipe 2, and ECU control fuel injectors 3 are sprayed, and rail pressure sensor 5 is real
When detection rail pressure and feed back to ECU.Fuel injector is in actual use as to will appear consistency poor for the increase of service life
It is different, engine emission risk can be caused to greatly improve, this is not permitted in regulation；For from economy, the one of fuel injector
It causes sex differernce that can lead to the deterioration of oil consumption, increases user cost.Currently, engine can only judge that fuel injector is in practical applications
No failure, the method without judging fuel injector consistency.
Invention content
The technical problem to be solved by the present invention is to the above-mentioned deficiency for the prior art, providing a kind of can effectively judge oil spout
The judgement fuel injector coherence method of the consistent sex differernce of device.
The technical scheme is that such：A kind of judgement fuel injector coherence method, including steps are as follows,
S1, activation setting program, pass through program setting target rail pressure value；
S2, ECU control fuel metering valve and open, and common rail overpressure is made to reach preset target rail pressure value；
S3, ECU control fuel metering valve and close, and activate one of fuel injector, make fuel injector to fix power-up time
Spray fuel oil；
S4, it is to be sprayed after record practical rail pressure value in common rail pipe, practical rail pressure value and target rail pressure value are asked poor
Obtain the practical drop-out value of the fuel injector；
S5, by practical drop-out value compared with the standard drop-out value of standard injector, if practical drop-out value beyond standard decline
The margin of tolerance of value, then the consistency of the fuel injector is poor；
S6, step S2-S5 is repeated, judges the consistency of other each fuel injectors.
As a further improvement, in the step S5, when the consistency difference of fuel injector, ECU activates the fuel injector
Dynamic compensation policy or alarm strategy.
Further, the target rail pressure value is 1400bar~1800bar.
Further, the target rail pressure value is 1600bar.
Further, fuel injector carries out one or many injections in the fixation power-up time.
Advantageous effect
Compared with prior art, the present invention have the advantage that for：
1, by utilizing the practical drop-out value and standard drop-out value ratio of common rail overpressure after each fuel injector oil spout successively
Compared with, can effectively judge the consistent sex differernce of each fuel injector of engine, and activate consistency difference fuel injector dynamic compensation plan
Slightly or alarm strategy, guarantee engine performance reduce oil consumption and discharge risk；
2, control fuel metering valve closes fuel metering after so that the rail pressure in high-pressure oil pipe is reached preset target rail pressure value
Valve make rail pressure stablize fuel injector oil spout can be accurately detected in target rail pressure value after practical rail pressure value in high-pressure oil pipe, improve
Judge the validity of the consistency of fuel injector.
Description of the drawings
Fig. 1 is the schematic diagram of injection system；
Fig. 2 is the flow chart of the present invention.
Wherein, 1- common rail pipes, 2- high-pressure oil pipes, 3- fuel injectors, 4- fuel metering valves, 5- rail pressure sensors.
Specific implementation mode
The present invention is described further for specific embodiment in below in conjunction with the accompanying drawings.
Refering to fig. 1-2, a kind of judgement fuel injector coherence method, including steps are as follows,
S1, activation setting program, by program setting target rail pressure value, target rail pressure value is 1400bar~1800bar,
Preferably, target rail pressure value is 1600bar, facilitate control and detection；
S2, ECU control fuel metering valve 4 and open, and pressure in common rail pipe 1 is made to reach preset target rail pressure value；
S3, ECU control fuel metering valve 4 and close, and activate one of fuel injector 3, when making fuel injector 3 with fixed power up
Between spray fuel oil, fuel injector 3 carries out one or many injections in fixed power-up time；
S4, it is to be sprayed after record practical rail pressure value in common rail pipe 1, practical rail pressure value and target rail pressure value are asked poor
Obtain the practical drop-out value of the fuel injector 3；
S5, by practical drop-out value compared with the standard drop-out value of standard injector, if practical drop-out value beyond standard decline
The margin of tolerance of value, then the consistency of the fuel injector 3 is poor, wherein standard drop-out value is standard injector (completely new fuel injector)
The a reference value obtained under the conditions of above-mentioned target rail pressure value and fixed power-up time, under the margin of tolerance=standard drop-out value ± standard
Depreciation × 10%；
S6, step S2-S5 is repeated, judges the consistency of other each fuel injectors 3.
In step s 5, when the consistency difference of fuel injector 3, ECU activates dynamic compensation policy or the alarm of the fuel injector 3
Strategy.
Beneficial effects of the present invention are：By utilizing the practical decline of common rail overpressure after each fuel injector oil spout successively
Value can effectively judge the consistent sex differernce of each fuel injector of engine compared with standard drop-out value, and activate the spray of consistency difference
The dynamic compensation policy or alarm strategy of oily device, ensure engine performance, reduce oil consumption and discharge risk；Control fuel metering valve
Fuel metering valve is closed after so that the rail pressure in high-pressure oil pipe is reached preset target rail pressure value makes rail pressure stablize in target rail pressure value,
The practical rail pressure value in high-pressure oil pipe after fuel injector oil spout can be accurately detected, the effective of the consistency for judging fuel injector is improved
Property；This method be suitable for engine operation (vehicle operation) stage test, belong in use and assess, it is ensured that fuel injector it is consistent
Property, monitoring is that entire engine uses life cycle.
What has been described above is only a preferred embodiment of the present invention, it should be pointed out that for those skilled in the art,
Without departing from the structure of the invention, several modifications and improvements can also be made, these all do not interfere with implementation of the present invention
Effect and patent practicability.
Claims (5)
1. a kind of judgement fuel injector coherence method, it is characterised in that：Including steps are as follows,
S1, activation setting program, pass through program setting target rail pressure value；
S2, ECU control fuel metering valve (4) and open, and common rail pipe (1) interior pressure is made to reach preset target rail pressure value；
S3, ECU control fuel metering valve (4) and close, and activate one of fuel injector (3), and fuel injector (3) is made to be powered up with fixed
Time sprays fuel oil；
S4, it is to be sprayed after record practical rail pressure value in common rail pipe (1), practical rail pressure value and target rail pressure value are asked poor
To the practical drop-out value of the fuel injector (3)；
S5, by practical drop-out value compared with the standard drop-out value of standard injector, if practical drop-out value is beyond standard drop-out value
The margin of tolerance, then the consistency of the fuel injector (3) is poor；
S6, step S2-S5 is repeated, judges the consistency of other each fuel injectors (3).
2. a kind of judgement fuel injector coherence method according to claim 1, it is characterised in that：In the step S5,
When the consistency difference of fuel injector (3), ECU activates the dynamic compensation policy or alarm strategy of the fuel injector (3).
3. a kind of judgement fuel injector coherence method according to claim 1, it is characterised in that：The target rail pressure value
For 1400bar~1800bar.
4. a kind of judgement fuel injector coherence method according to claim 3, it is characterised in that：The target rail pressure value
For 1600bar.
5. a kind of judgement fuel injector coherence method according to claim 1, it is characterised in that：In the fixed power-up
Fuel injector (3) carries out one or many injections in time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810547790.3A CN108757253B (en) | 2018-05-31 | 2018-05-31 | Method for judging consistency of oil injectors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810547790.3A CN108757253B (en) | 2018-05-31 | 2018-05-31 | Method for judging consistency of oil injectors |
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| Publication Number | Publication Date |
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| CN108757253A true CN108757253A (en) | 2018-11-06 |
| CN108757253B CN108757253B (en) | 2021-02-23 |
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| CN201810547790.3A Active CN108757253B (en) | 2018-05-31 | 2018-05-31 | Method for judging consistency of oil injectors |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111456873A (en) * | 2020-04-09 | 2020-07-28 | 北京工业大学 | Multi-cylinder oil injection consistency online diagnosis method based on rail pressure characteristics caused by oil injection |
| CN112855375A (en) * | 2021-02-18 | 2021-05-28 | 中国第一汽车股份有限公司 | Control method and device of oil injector, electronic equipment and storage medium |
| CN113586302A (en) * | 2021-07-29 | 2021-11-02 | 北京工业大学 | Method for detecting valve tightness based on pressure drop characteristics |
| CN116906240A (en) * | 2023-09-01 | 2023-10-20 | 卓品智能科技无锡股份有限公司 | Multi-cylinder engine fuel injector fault detection method based on rail pressure signal fluctuation |
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| EP1088982A3 (en) * | 1999-09-30 | 2002-11-13 | Robert Bosch Gmbh | Method and apparatus to determine the fuel temperature in a common rail system |
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| JP2013096335A (en) * | 2011-11-02 | 2013-05-20 | Bosch Corp | Deposit detection method and common rail type fuel injection control apparatus |
| CN103397963A (en) * | 2013-08-14 | 2013-11-20 | 潍柴动力股份有限公司 | Fast oil rail pressure decompression and control method and electronic control high-pressure common rail system |
| CN104481769A (en) * | 2014-12-03 | 2015-04-01 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Online diagnosis method for uniformity of common-rail oil injectors |
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2018
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1088982A3 (en) * | 1999-09-30 | 2002-11-13 | Robert Bosch Gmbh | Method and apparatus to determine the fuel temperature in a common rail system |
| JP2013096335A (en) * | 2011-11-02 | 2013-05-20 | Bosch Corp | Deposit detection method and common rail type fuel injection control apparatus |
| CN102996310A (en) * | 2012-12-04 | 2013-03-27 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Method for measuring armature travel of oil injector assembly |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111456873A (en) * | 2020-04-09 | 2020-07-28 | 北京工业大学 | Multi-cylinder oil injection consistency online diagnosis method based on rail pressure characteristics caused by oil injection |
| CN111456873B (en) * | 2020-04-09 | 2021-09-10 | 北京工业大学 | Multi-cylinder oil injection consistency online diagnosis method based on rail pressure characteristics caused by oil injection |
| CN112855375A (en) * | 2021-02-18 | 2021-05-28 | 中国第一汽车股份有限公司 | Control method and device of oil injector, electronic equipment and storage medium |
| CN112855375B (en) * | 2021-02-18 | 2022-05-24 | 中国第一汽车股份有限公司 | Control method and device of oil injector, electronic equipment and storage medium |
| CN113586302A (en) * | 2021-07-29 | 2021-11-02 | 北京工业大学 | Method for detecting valve tightness based on pressure drop characteristics |
| CN116906240A (en) * | 2023-09-01 | 2023-10-20 | 卓品智能科技无锡股份有限公司 | Multi-cylinder engine fuel injector fault detection method based on rail pressure signal fluctuation |
| CN116906240B (en) * | 2023-09-01 | 2024-03-19 | 卓品智能科技无锡股份有限公司 | Multi-cylinder engine fuel injector fault detection method based on rail pressure signal fluctuation |
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| CN108757253B (en) | 2021-02-23 |
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