CN109653891A - A kind of normally opened method for diagnosing faults of high pressure fuel nozzle of gasoline direct injection engine - Google Patents
A kind of normally opened method for diagnosing faults of high pressure fuel nozzle of gasoline direct injection engine Download PDFInfo
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- CN109653891A CN109653891A CN201910148044.1A CN201910148044A CN109653891A CN 109653891 A CN109653891 A CN 109653891A CN 201910148044 A CN201910148044 A CN 201910148044A CN 109653891 A CN109653891 A CN 109653891A
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- China
- Prior art keywords
- high pressure
- fuel nozzle
- preset threshold
- normally opened
- pressure 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
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a kind of normally opened method for diagnosing faults of high pressure fuel nozzle of gasoline direct injection engine, this method are as follows: in the case where meeting the normally opened fault diagnosis condition of high pressure fuel nozzle, if certain cylinder catches fire number greater than number preset threshold of catching fire in N number of working cycles of setting, and exhaust air-fuel ratio is less than air-fuel ratio preset threshold and continues the first setting time t1, and the difference of desired high pressure oil rail pressure and the high pressure oil rail pressure of actual measurement is greater than pressure preset threshold and continues the second setting time t2, then determine that the high pressure fuel nozzle of the cylinder is in normally open, otherwise determine that the high pressure fuel nozzle of the cylinder is not in normally open.Rapidly and accurately the normally opened failure of high pressure fuel nozzle can be diagnosed using this method.
Description
Technical field
The invention belongs to gasoline direct injection engine fields, and in particular to a kind of high pressure fuel nozzle of gasoline direct injection engine
Normally opened method for diagnosing faults.
Background technique
The high pressure fuel nozzle of gasoline direct injection engine is one of important spare part of combustion system of engine.It and high pressure
Oily rail, high-pressure oil pump form fuel injection system together, and fuel nozzle is according to the control of engine electric-controlled unit (hereinafter referred to as ECU)
Signal processed is responsible for for the quantitative fuel oil under specific oil pressure being sprayed onto combustion chamber in particular moment forming gaseous mixture, finally be arranged
It puts, the combustion process of oil consumption and power optimum balance.As shown in Figure 1, fuel system with high injection pressure includes high-pressure oil pump 1, high pressure
Oil pipe 2, high-pressure common-rail pipe (i.e. fuel dispensing tube) 3 and high pressure fuel nozzle 4.Although having filtering in 1 entrance of high-pressure oil pump
Net also has filter screen in 4 entrance of high pressure fuel nozzle, and has cleaning to oil pump, oily rail, oil pipe and nozzle in production technology
Degree requires, but these measures are still not enough to completely eliminate pressure duct and are mixed into impurity in production, transport and assembling process.This
A little metal impurities, because that can not pass through high pressure fuel Nozzle, can be attached on valve ball, locking spray nozzle ball after piercing filter screen
Valve causes valve seat to be not closed completely, to the normally opened phenomenon of high pressure fuel nozzle occur.According to existing statistical data, in volume production product
The probability for this failure occur is about hundred a ten thousandth of 5-7 PPM() left and right.It is all with good grounds in existing engine diagnostic strategy
Each cylinder fluctuation of speed diagnoses the method caught fire, but without being specifically used to diagnose the whether normally opened method of high pressure fuel nozzle.
Summary of the invention
The object of the present invention is to provide a kind of normally opened method for diagnosing faults of high pressure fuel nozzle of gasoline direct injection engine, with
Rapidly and accurately the normally opened failure of high pressure fuel nozzle is diagnosed.
The normally opened method for diagnosing faults of high pressure fuel nozzle of gasoline direct injection engine of the present invention are as follows: meeting high pressure
In the case where the normally opened fault diagnosis condition of fuel nozzle, if certain cylinder catches fire number greater than mistake in N number of working cycles of setting
Fiery number preset threshold, and exhaust air-fuel ratio is less than air-fuel ratio preset threshold and continues the first setting time t1, and desired height
The difference of pressure oil rail pressure power and the high pressure oil rail pressure of actual measurement is greater than pressure preset threshold and continues the second setting time t2, then determine
The high pressure fuel nozzle of the cylinder is in normally open, otherwise determines that the high pressure fuel nozzle of the cylinder is not in normally open.
If the high pressure fuel nozzle of each cylinder is without electric fault, and engine speed is in slow-speed of revolution preset threshold and high revolving speed
Between preset threshold, and engine load is less than load preset threshold, and exhaust air-fuel ratio Closed-cycle correction function is opened, then it represents that
Meet the normally opened fault diagnosis condition of high pressure fuel nozzle.
Preferably, the value of the N is 100.
Using the normally opened method for diagnosing faults of high pressure fuel nozzle of the present invention, in high pressure fuel nozzle because of pressure duct
The reason of internal impurity and when leading to normally opened, can rapidly and accurately complete to diagnose, avoid too late because that can not diagnose or diagnose
When caused by the case where damaging engine occur, traffic safety accident caused by capable of preventing to greatest extent thus.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of fuel system with high injection pressure.
Fig. 2 is the flow chart of embodiment 1.
Fig. 3 is the flow chart of embodiment 2.
Specific embodiment
It elaborates with reference to the accompanying drawing to the present invention.
Embodiment 1: the present embodiment is directed to gasoline direct single-cylinder engine, as shown in Fig. 2, its high pressure fuel nozzle is normal
Opening method for diagnosing faults includes:
The first step, ECU judge whether high pressure fuel nozzle without electric fault, and engine speed is in slow-speed of revolution preset threshold and high
Between revolving speed preset threshold (i.e. engine speed is greater than slow-speed of revolution preset threshold and is less than high revolving speed preset threshold), and engine
Load is less than load preset threshold, and exhaust air-fuel ratio Closed-cycle correction function is opened, if it is, indicating to meet high pressure fuel spray
The normally opened fault diagnosis condition of mouth (i.e. high pressure fuel nozzle normally opened fault diagnosis functions activation), then executes second step, otherwise after
It is continuous to execute the first step.
Second step, ECU are according to engine crankshaft position sensor signal, in the compression stroke phase for calculating a working cycles
Engine speed and its change rate, then according to the engine speed and its change rate to determine whether catch fire (its calculating, judgement
Mode is the prior art), and the number that catches fire is recorded, 100 working cycles are a counting period, obtain 100 working cycles
The interior cylinder catches fire number, and ECU calculates desired high pressure oil rail pressure (its calculation is the prior art)；Then third is executed
Step.
Third step, ECU catch fire number, exhaust air-fuel ratio and desired high pressure oil rail according to the cylinder in 100 working cycles
The difference of pressure and the high pressure oil rail pressure of oil pressure sensor actual measurement is judged, if the cylinder catches fire in 100 working cycles
Number is greater than number preset threshold of catching fire, and exhaust air-fuel ratio is less than air-fuel ratio preset threshold and continues the first setting time t1,
And the difference of desired high pressure oil rail pressure and the high pressure oil rail pressure of oil pressure sensor actual measurement is greater than pressure preset threshold and continues
Second setting time t2, then determine that high pressure fuel nozzle is in normally open, then terminate, otherwise determine high pressure fuel nozzle not
In normally open, then terminate.
After ECU determines that high pressure fuel nozzle is in normally open, Trouble Report can be generated, it can be by controlling malfunction indicator lamp
The mode of flashing alerts driver, while limiting engine highest working speed and peak load, it is ensured that traffic safety.
Embodiment 2: the present embodiment is directed to gasoline direct multicylinder engine, as shown in figure 3, its high pressure fuel nozzle is normal
Opening method for diagnosing faults includes:
The first step, ECU judge whether the high pressure fuel nozzle of each cylinder without electric fault, and engine speed presets threshold in the slow-speed of revolution
Between value and high revolving speed preset threshold (i.e. engine speed is greater than slow-speed of revolution preset threshold and is less than high revolving speed preset threshold), and
Engine load is less than load preset threshold, and exhaust air-fuel ratio Closed-cycle correction function is opened, if it is, indicating to meet high pressure
The normally opened fault diagnosis condition of fuel nozzle (i.e. the normally opened fault diagnosis functions activation of high pressure fuel nozzle), then executes second step,
Otherwise the first step is continued to execute.
Second step, ECU are currently at the cylinder serial number of compression stroke phase, root according to CMPS Camshaft Position Sensor signal identification
According to engine crankshaft position sensor signal, engine speed and its change in a working cycles each cylinder compression stroke phase are calculated
Rate, then judging whether each cylinder catches fire according to these engine speed and its change rate, (it calculates, judgment mode is existing
Technology), and record each cylinder and catch fire number, 100 working cycles are a counting period, obtain each cylinder in 100 working cycles
Catch fire number, and ECU calculates desired high pressure oil rail pressure (its calculation is the prior art)；Then third step is executed.
Third step, ECU catch fire number, exhaust air-fuel ratio and desired high pressure oil rail according to each cylinder in 100 working cycles
The difference of pressure and the high pressure oil rail pressure of oil pressure sensor actual measurement is judged, if certain cylinder catches fire in 100 working cycles
Number is greater than number preset threshold of catching fire, and exhaust air-fuel ratio is less than air-fuel ratio preset threshold and continues the first setting time t1,
And the difference of desired high pressure oil rail pressure and the high pressure oil rail pressure of oil pressure sensor actual measurement is greater than pressure preset threshold and continues
Second setting time t2, then determine that the high pressure fuel nozzle of the cylinder is in normally open, otherwise determine the high pressure fuel spray of the cylinder
Mouth is not in normally open；Terminate after completing the high pressure fuel nozzle judgement of all cylinders.
After ECU determines that the high pressure fuel nozzle of certain (several) a cylinder is in normally open, Trouble Report can be generated, control can be passed through
The mode of flicker of fault indicating lamps processed alerts driver, while limiting engine highest working speed and peak load, it is ensured that row
Vehicle safety.
Claims (3)
1. a kind of normally opened method for diagnosing faults of high pressure fuel nozzle of gasoline direct injection engine, which is characterized in that this method are as follows:
In the case where meeting the normally opened fault diagnosis condition of high pressure fuel nozzle, if certain cylinder in N number of working cycles of setting
The number that catches fire is greater than number preset threshold of catching fire, and exhaust air-fuel ratio is less than air-fuel ratio preset threshold and continues the first setting time
t1, and the difference of desired high pressure oil rail pressure and the high pressure oil rail pressure of actual measurement is greater than pressure preset threshold and continues the second setting
Time t2, then determine that the high pressure fuel nozzle of the cylinder is in normally open, otherwise determine that the high pressure fuel nozzle of the cylinder is not in
Normally open.
2. the normally opened method for diagnosing faults of the fuel nozzle of gasoline direct injection engine according to claim 1, it is characterised in that:
If the high pressure fuel nozzle of each cylinder is without electric fault, and engine speed is in slow-speed of revolution preset threshold and high revolving speed preset threshold
Between, and engine load is less than load preset threshold, and exhaust air-fuel ratio Closed-cycle correction function is opened, then it represents that meet high pressure
The normally opened fault diagnosis condition of fuel nozzle.
3. the normally opened method for diagnosing faults of high pressure fuel nozzle of gasoline direct injection engine according to claim 1 or 2, special
Sign is: the value of the N is 100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910148044.1A CN109653891A (en) | 2019-02-28 | 2019-02-28 | A kind of normally opened method for diagnosing faults of high pressure fuel nozzle of gasoline direct injection engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910148044.1A CN109653891A (en) | 2019-02-28 | 2019-02-28 | A kind of normally opened method for diagnosing faults of high pressure fuel nozzle of gasoline direct injection engine |
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| Publication Number | Publication Date |
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| CN109653891A true CN109653891A (en) | 2019-04-19 |
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| CN201910148044.1A Pending CN109653891A (en) | 2019-02-28 | 2019-02-28 | A kind of normally opened method for diagnosing faults of high pressure fuel nozzle of gasoline direct injection engine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111237072A (en) * | 2020-03-27 | 2020-06-05 | 潍柴动力股份有限公司 | Electronic control diesel engine nozzle fault identification method and system and electronic control unit |
| CN112682237A (en) * | 2019-10-18 | 2021-04-20 | 通用汽车环球科技运作有限责任公司 | Early detection of fuel injectors with manufacturing issues |
| CN112963252A (en) * | 2021-03-18 | 2021-06-15 | 潍柴动力股份有限公司 | Emission control method, device and equipment of engine |
| CN113448318A (en) * | 2021-07-07 | 2021-09-28 | 江铃汽车股份有限公司 | Vehicle offline fault diagnosis control method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060116810A1 (en) * | 2003-02-08 | 2006-06-01 | Klaus Joos | Method for operating an injection valve of an internal combustion engine |
| CN107110044A (en) * | 2014-12-19 | 2017-08-29 | 丰田自动车株式会社 | The abnormity diagnostic system of air-fuel ratio sensor |
-
2019
- 2019-02-28 CN CN201910148044.1A patent/CN109653891A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060116810A1 (en) * | 2003-02-08 | 2006-06-01 | Klaus Joos | Method for operating an injection valve of an internal combustion engine |
| CN107110044A (en) * | 2014-12-19 | 2017-08-29 | 丰田自动车株式会社 | The abnormity diagnostic system of air-fuel ratio sensor |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112682237A (en) * | 2019-10-18 | 2021-04-20 | 通用汽车环球科技运作有限责任公司 | Early detection of fuel injectors with manufacturing issues |
| CN111237072A (en) * | 2020-03-27 | 2020-06-05 | 潍柴动力股份有限公司 | Electronic control diesel engine nozzle fault identification method and system and electronic control unit |
| CN111237072B (en) * | 2020-03-27 | 2022-08-05 | 潍柴动力股份有限公司 | Electronic control diesel engine nozzle fault identification method and system and electronic control unit |
| CN112963252A (en) * | 2021-03-18 | 2021-06-15 | 潍柴动力股份有限公司 | Emission control method, device and equipment of engine |
| CN113448318A (en) * | 2021-07-07 | 2021-09-28 | 江铃汽车股份有限公司 | Vehicle offline fault diagnosis control method |
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Application publication date: 20190419 |
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