CN106224133B - EGR pipeline fault detection method - Google Patents
EGR pipeline fault detection method Download PDFInfo
- Publication number
- CN106224133B CN106224133B CN201610769960.3A CN201610769960A CN106224133B CN 106224133 B CN106224133 B CN 106224133B CN 201610769960 A CN201610769960 A CN 201610769960A CN 106224133 B CN106224133 B CN 106224133B
- Authority
- CN
- China
- Prior art keywords
- exhaust gas
- gas flow
- useless
- egr
- vendltp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The invention discloses a kind of EGR pipeline fault detection methods, including step：Obtain air excess factor value and the current fuel oil quality M for spraying into engineOil, calculate the air quality M of sucking engineIt is empty=λ * MOil*14.3；The volumetric efficiency obtained under the admission pressure and intake air temperature of motor intake manifold, engine displacement and the engine operating condition demarcated in advance obtains MMixing；Waste gas stream M is calculatedUseless Nox=MMixing‑MIt is empty；Obtain the exhaust gas flow M that EGR line system and device obtainsUseless VenDltP；Calculate exhaust gas flow deviation MDiff=MUseless Nox‑MUseless VenDltP；Store exhaust gas flow deviation M at least twiceDiffAnd effective exhaust gas flow deviation M is calculatedDiffAvrg；If effective exhaust gas flow deviation MDiffAvrgAbsolute value not less than allow maximum deviation, send out fault cues.This method realizes that the calculating to EGR exhaust flow, the numerical value measured with the exhaust gas flow of existing EGR line are compared, and realizes and is verified to the exhaust gas flow calculation of existing EGR line, improves the accuracy detected to EGR line.
Description
Technical field
The present invention relates to technical field of engines, in particular to a kind of EGR pipeline fault detection method.
Background technology
Six diesel engine EGR of Europe (exhaust gas recycling) controls calculate exhaust gas flow based on Venturi tube and carry out closed-loop control, text
Venturi exhaust gas flow calculating need sensor include：Differential pressure pickup, Wen Qiu between venturi tube inlet and aditus laryngis
In tube inlet pressure sensor, venturi tube inlet exhaust gas temperature sensor.Presently, there are the leak detection method of EGR line,
It is by the way that, to one sinusoidal excitation signal of EGR valve, the mode for detecting feedback pressure carries out air leakage detection under steady state condition.But
There are the biographies such as measurement error, rigging error even loading error there may be null offset, sensor for differential pressure pickup itself
Sensor problem, the exhaust gas flow that Venturi way calculates are unable to get verification, if the exhaust gas flow inaccuracy calculated will be led
It causes the inaccuracy of EGR controls, the emissions such as Nox to increase, finally cause post-processing load increase urea consumption excessive or causes
Discharge the problems such as exceeded.
Therefore, how a kind of EGR pipeline fault detection method is provided, to realize the verification of the system detectio of EGR line, from
And the accuracy to system detectio is improved, it is a technical problem that technical personnel in the field need to solve at present.
Invention content
In view of this, the present invention provides a kind of EGR pipeline fault detection method, to realize the system detectio of EGR line
Verification, to improve to the accuracy of system detectio.
To achieve the above object, the present invention provides the following technical solutions：
A kind of EGR pipeline fault detection method comprising following steps：
Obtain air excess factor value and the current fuel oil quality M for spraying into engineOil, and combine MIt is empty=λ * MOil* 14.3,
The air quality M of sucking engine is calculatedIt is empty；
Obtain admission pressure and intake air temperature, the engine displacement and engine work demarcated in advance of motor intake manifold
Volumetric efficiency under condition is simultaneously established physical model and is calculated, and obtains MMixing；
Exhaust gas flow M is calculatedUseless Nox, MUseless Nox=MMixing-MIt is empty；
Obtain the exhaust gas flow M that EGR line system detecting device obtainsUseless VenDltP；
Calculate exhaust gas flow deviation MDiff, MDiff=MUseless Nox-MUseless VenDltP；
Store exhaust gas flow deviation M at least twiceDiffAnd effective exhaust gas flow deviation M is calculatedDiffAvrg；
If effective exhaust gas flow deviation MDiffAvrgAbsolute value not less than allow maximum deviation, then send out fault cues.
Preferably, in above-mentioned EGR pipeline fault detection method, air excess factor value is obtained by Nox sensors.
Preferably, in above-mentioned EGR pipeline fault detection method, by first pressure sensor obtain the engine into
The admission pressure of gas manifold, the first temperature sensor obtain intake air temperature.
Preferably, in above-mentioned EGR pipeline fault detection method, the EGR line system detecting device includes：
Obtain the differential pressure pickup of pressure between venturi tube inlet and aditus laryngis；
Obtain the second pressure sensor of venturi tube inlet pressure；
Obtain the second temperature sensor of venturi tube inlet exhaust gas temperature；
For calculating exhaust gas flow MUseless VenDltPComputing module.
Preferably, in above-mentioned EGR pipeline fault detection method, the exhaust gas that EGR line system detecting device obtains is obtained
Flow MUseless VenDltPIncluding step：
Judge differential pressure pickup between venturi tube inlet and aditus laryngis, venturi tube inlet second pressure sensor and
Whether the second temperature sensor three of venturi tube inlet exhaust gas temperature has electric fault；
Distinguish if the second pressure sensor, the second temperature sensor and the equal fault-free of the differential pressure pickup
The pressure and venturi tube inlet exhaust gas temperature of pressure difference, venturi tube inlet between acquisition venturi tube inlet and aditus laryngis, and
Exhaust gas flow M is calculated according to the data measuredUseless VenDltP。
Preferably, it in above-mentioned EGR pipeline fault detection method, is calculated using Bernoulli equation and flows through the useless of Venturi tube
Throughput MUseless VenDltP。
Preferably, in above-mentioned EGR pipeline fault detection method, exhaust gas flow deviation M at least twice is storedDiffAnd it calculates
Obtain effective exhaust gas flow deviation MDiffAvrg；
Calculate effective exhaust gas flow MIt is useless=MDiffAvrg+MUseless VenDltP。
It can be seen via above technical scheme that the invention discloses a kind of EGR pipeline fault detection method, including following step
Suddenly：Obtain air excess factor value and the current fuel oil quality M for spraying into engineOil, and combine MIt is empty=λ * MOil* 14.3, it calculates
Go out to suck the air quality M of engineIt is empty；Obtain motor intake manifold admission pressure and intake air temperature, engine displacement and
Volumetric efficiency under each operating mode of engine demarcated in advance is simultaneously established physical model and is calculated, and obtains MMixing；It is calculated useless
Throughput MUseless Nox, MUseless Nox=MMixing-MIt is empty；Obtain the exhaust gas flow M that EGR line system and device obtainsUseless VenDltP；Calculate exhaust gas flow
Deviation MDiff, MDiff=MUseless Nox-MUseless VenDltP；Store exhaust gas flow deviation M at least twiceDiffAnd effective exhaust gas flow is calculated
Deviation MDiffAvrg；If effective exhaust gas flow deviation MDiffAvrgAbsolute value not less than allow maximum deviation, then send out failure and carry
Show.The fault detection method of above-mentioned offer can realize the calculating to EGR exhaust flow, and be filled with the system of existing EGR line
It sets the numerical value measured to be compared, to realize to the verification of the system detectio of existing EGR line, improve to EGR line
The accuracy of detection.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the flow chart of EGR pipeline fault detection method provided in an embodiment of the present invention.
Specific implementation mode
Core of the invention is to provide a kind of EGR pipeline fault detection method, to realize the school of the system detectio of EGR line
It tests, to improve the accuracy to system detectio.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, disclosing a kind of EGR pipeline fault detection method in the present invention, include the following steps：
Step S1：ECU is initialized.
Start ECU (electronic control unit), keeps engine in running order.
Step S2：Wait for steady state release operating mode.
After initializing electronic control component, continues for some time, engine is made to be in normal table working condition.
Step S3：Judge whether to meet steady state release condition.
Can be first determined whether after meeting steady state release condition the sensor of EGR line system detecting device whether have short circuit or
The apparatus failures such as open circuit, if there is electric fault that can need to carry out the sensor or connection line of EGR line system detecting device
Repair is replaced, and continues to execute step S2.
Step S4:According to Nox sensor measurement air qualities MIt is empty, M is calculated according to admission pressure P, temperature TIt is mixed, calculate
MUseless Nox, M is calculated according to EGR line system detecting deviceUseless VenDltP, calculate multiple exhausted air quantity deviation MDiff。
Obtain air excess factor value and the current fuel oil quality M for spraying into engineOil, and combine MIt is empty=λ * MOil* 14.3,
The air quality M of sucking engine is calculatedIt is empty。
Obtain admission pressure P and intake air temperature T, engine displacement and the engine demarcated in advance of motor intake manifold
Volumetric efficiency under each operating mode is simultaneously established physical model and is calculated, and obtains MMixing。
Exhaust gas flow M is calculatedUseless Nox, MUseless Nox=MMixing-MIt is empty。
Obtain the exhaust gas flow M that EGR line system detecting device obtainsUseless VenDltP。
Calculate exhaust gas flow deviation MDiff, MDiff=MUseless Nox-MUseless VenDltP。
Step S5：Judge MDiffAverage value MDiffAvrgWhether tolerance maximum value is more than.
If effective exhaust gas flow deviation MDiffAvrgAbsolute value not less than allow maximum deviation, then send out fault cues,
I.e. | MDiffAvrg|>=MDiffMax, then judging sensor that EGR line system detecting device includes, there are manufacture deviation, zeros to float
Shifting amount is excessive, the equiprobable problem of setup error, needs to quote corresponding EGR line system detecting device failure system failure and carries
Show or carry out other troubleshootings.
If less than the maximum deflection difference value allowed, illustrate meeting the requirements for detection, waits under ECU (electronic control unit)
Electricity.
The fault detection method of above-mentioned offer can realize the calculating to EGR exhaust flow, and be with existing EGR line
Bulk cargo is set the numerical value measured and is compared, and to realize to the verification of the system detectio of existing EGR line, improves to EGR
The accuracy of pipeline detection.
Measurement to air system λ value disclosed herein can be measured by Nox sensors.Nox sensors are calculated
Oxygen concentration O2rIt is converted into air excess factor value or sensor itself and air excess factor value, current oil spout is directly provided
Measure MOilFor engine control known quantity, by λ and MOilIt substitutes into formula and obtains the air quality needed for engine combustion, is i.e. sucking hair
The air quality M of motivationIt is empty=λ * MOil*14.3。
The total air inflow of present engine (exhaust gas and fresh air total amount) MAlwaysStarted according to what first pressure sensor measured
The intake air temperature T for the motor intake manifold that admission pressure P and the first temperature sensor at machine inlet manifold are obtained, additionally
According to the volumetric efficiency Fac under the engine displacement V of engine, each operating mode of engine demarcated in advance and establish physical model
It is calculated, result of calculation MMixing.For the method for being measured as the prior art of this part can refer to existing disclosed method into
Row measures, and the application is not specifically limited.
Include for disclosed EGR line system detecting device：Obtain the pressure of pressure between venturi tube inlet and aditus laryngis
Gap sensor；Obtain the second pressure sensor of venturi tube inlet pressure；Obtain the second of venturi tube inlet exhaust gas temperature
Temperature sensor；For calculating exhaust gas flow MUseless VenDltPComputing module.The EGR line system detecting device is existing known
A kind of computational methods, the purpose of detection method disclosed herein is the knot detected to EGR line system detecting device
Fruit is verified, to reach the accuracy of detection.
Obtain the exhaust gas flow M that EGR line system detecting device obtainsUseless VenDltPIncluding step：
Judge differential pressure pickup between venturi tube inlet and aditus laryngis, venturi tube inlet second pressure sensor and
Whether the second temperature sensor three of venturi tube inlet exhaust gas temperature has electric fault；
Distinguish if the second pressure sensor, the second temperature sensor and the equal fault-free of the differential pressure pickup
The pressure and venturi tube inlet exhaust gas temperature of pressure difference, venturi tube inlet between acquisition venturi tube inlet and aditus laryngis, and
Exhaust gas flow M is calculated according to the data measuredUseless VenDltP。
For calculating exhaust gas flow MUseless VenDltPComputational methods Bernoulli equation can be used calculated.
Pass through the calculated M of Nox sensorsUseless NoxThe exhaust gas flow M obtained with EGR line system detecting deviceUseless VenDltPInto
Exhaust gas flow deviation M is calculated in row deviationDiff=MUseless Nox-MUseless VenDltP, calculate at least twice and to obtain effective exhaust gas flow inclined
Poor MDiffAvrg, the exhaust gas flow that current Venturi way calculates is corrected according to the exhaust gas flow deviation of calculating, is as a result finally had
The exhaust gas flow M of effectIt is useless=MDiffAvrg+MIt is uselessVenDltP。
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (7)
1. a kind of EGR pipeline fault detection method, which is characterized in that include the following steps：
Obtain air excess factor value and the current fuel oil quality M for spraying into engineOil, and combine MIt is empty=λ * MOil* 14.3, it calculates
Obtain the air quality M of sucking engineIt is empty；
It obtains under the admission pressure and intake air temperature of motor intake manifold, engine displacement and the engine operating condition demarcated in advance
Volumetric efficiency and establish physical model and calculated, obtain MMixing, wherein MMixingFor engine discharge recycling exhaust gas with
Suck the Theoretical Mass value of the mixed gas of the fresh air of engine；
Exhaust gas flow M is calculatedUseless Nox, MUseless Nox=MMixing-MIt is empty；
Obtain the exhaust gas flow M that EGR line system detecting device obtainsUseless VenDltP；
Calculate exhaust gas flow deviation MDiff, MDiff=MUseless Nox-MUseless VenDltP；
Store exhaust gas flow deviation M at least twiceDiffAnd effective exhaust gas flow deviation M is calculatedDiffAvrg；
If effective exhaust gas flow deviation MDiffAvrgAbsolute value not less than allow maximum deviation, then send out fault cues.
2. EGR pipeline fault detection method according to claim 1, which is characterized in that obtained by Nox sensors excessive
Air coefficient λ value.
3. EGR pipeline fault detection method according to claim 1, which is characterized in that obtained by first pressure sensor
The admission pressure of the motor intake manifold, the first temperature sensor is taken to obtain intake air temperature.
4. EGR pipeline fault detection method according to claim 1, which is characterized in that the EGR line system detectio dress
Set including：
Obtain the differential pressure pickup of pressure difference between venturi tube inlet and aditus laryngis；
Obtain the second pressure sensor of venturi tube inlet pressure；
Obtain the second temperature sensor of venturi tube inlet exhaust gas temperature；
For calculating exhaust gas flow MUseless VenDltPComputing module.
5. EGR pipeline fault detection method according to claim 4, which is characterized in that obtain EGR line system detectio dress
The exhaust gas flow M setUseless VenDltPIncluding step：
Judge the second pressure sensor and Wen Qiu of differential pressure pickup between venturi tube inlet and aditus laryngis, venturi tube inlet
In the second temperature sensor three of tube inlet exhaust gas temperature whether have electric fault；
It is obtained respectively if the second pressure sensor, the second temperature sensor and the equal fault-free of the differential pressure pickup
The pressure and venturi tube inlet exhaust gas temperature of pressure difference, venturi tube inlet between venturi tube inlet and aditus laryngis, and according to
The data measured calculate exhaust gas flow MUseless VenDltP。
6. EGR pipeline fault detection method according to claim 5, which is characterized in that calculate stream using Bernoulli equation
Cross the exhaust gas flow M of Venturi tubeUseless VenDltP。
7. EGR pipeline fault detection method according to claim 1, which is characterized in that store exhaust gas flow at least twice
Deviation MDiffAnd effective exhaust gas flow deviation M is calculatedDiffAvrg；
Calculate effective exhaust gas flow MIt is useless=MDiffAvrg+MUseless VenDltP。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610769960.3A CN106224133B (en) | 2016-08-30 | 2016-08-30 | EGR pipeline fault detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610769960.3A CN106224133B (en) | 2016-08-30 | 2016-08-30 | EGR pipeline fault detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106224133A CN106224133A (en) | 2016-12-14 |
| CN106224133B true CN106224133B (en) | 2018-08-31 |
Family
ID=58071430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610769960.3A Active CN106224133B (en) | 2016-08-30 | 2016-08-30 | EGR pipeline fault detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106224133B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281776B (en) * | 2018-11-29 | 2020-06-26 | 潍柴动力股份有限公司 | Exhaust gas backflow fault monitoring method and device |
| CN110567726A (en) * | 2019-09-30 | 2019-12-13 | 潍柴动力股份有限公司 | crankcase fault detection method, device and system |
| CN111006867B (en) * | 2019-11-26 | 2021-08-20 | 广西玉柴机器股份有限公司 | Calibration method of engine air intake correction map table and air intake correction method |
| CN111042956B (en) * | 2019-12-26 | 2021-02-23 | 潍柴动力股份有限公司 | EGR flow fault judgment method, device and equipment |
| CN113250864B (en) * | 2020-02-12 | 2023-03-10 | 广州汽车集团股份有限公司 | EGR flow diagnosis method and system and automobile |
| CN113719364B (en) * | 2020-05-21 | 2022-11-25 | 广州汽车集团股份有限公司 | Method and device for determining EGR mass flow |
| CN111928925B (en) * | 2020-07-16 | 2022-12-09 | 中广核核电运营有限公司 | Venturi tube fault correction method and device, computer equipment and storage medium |
| DE102021203431A1 (en) * | 2021-04-07 | 2022-10-13 | Volkswagen Aktiengesellschaft | Diagnostic methods, control, motor vehicle |
| CN116066266A (en) * | 2021-10-29 | 2023-05-05 | 北汽福田汽车股份有限公司 | Exhaust gas recirculation system fault detection method and device, storage medium and vehicle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103249940A (en) * | 2011-12-01 | 2013-08-14 | 丰田自动车株式会社 | Fault diagnosis device for egr system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4354283B2 (en) * | 2004-01-20 | 2009-10-28 | 本田技研工業株式会社 | Exhaust gas recirculation leak detector |
-
2016
- 2016-08-30 CN CN201610769960.3A patent/CN106224133B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103249940A (en) * | 2011-12-01 | 2013-08-14 | 丰田自动车株式会社 | Fault diagnosis device for egr system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106224133A (en) | 2016-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106224133B (en) | EGR pipeline fault detection method | |
| CN103016213B (en) | Selectivity exhaust gas recirculation diagnostic system and method | |
| US8001834B2 (en) | Method for detecting faults in the air system of internal combustion engines | |
| US20090013665A1 (en) | Monitoring of Exhaust Gas Oxygen Sensor Performance | |
| CN101487425B (en) | Detection of engine intake manifold air-leaks | |
| CN102809409B (en) | System and method for detecting failures of mass airflow sensors in a parallel intake engine | |
| JP2009250238A (en) | Adaptation method and device of dynamics model of exhaust gas sensor | |
| JP5196068B2 (en) | Control device for internal combustion engine | |
| US6826471B2 (en) | Method for determining nitrogen oxide content in internal combustion engine exhaust gases containing oxygen | |
| US9500153B2 (en) | Internal combustion engine, in particular gas engine, for a motor vehicle | |
| CN103270263A (en) | Filter failure detection device for internal combustion engine | |
| JP2005155384A (en) | Failure diagnosis device for internal combustion engine provided with turbocharger | |
| WO2021057444A1 (en) | Method for quickly calibrating scr ammonia ratio factor of diesel engine | |
| CN112282986A (en) | Method and system for monitoring cooling efficiency of exhaust gas recirculation system and storage medium | |
| CN102829837B (en) | Method, device and system for measurement of oil injection volume | |
| CN106372806B (en) | For marine diesel engine CO2The measurement method and device of gas discharge | |
| KR102443425B1 (en) | Method for the diagnosis of a scr system | |
| CN105464820B (en) | Engine charge metering units and engine system | |
| JP2010270678A (en) | Oxygen sensor diagnostic device for internal combustion engine | |
| CN111307463B (en) | Air leakage detection method and device for engine exhaust system | |
| CN104179601A (en) | Method and control unit for determining a mass flow in a high-pressure exhaust gas recirculation system of an internal combustion engine | |
| CN104895686B (en) | Determine the method and system of the oxygen concentration of engine exhaust | |
| JP2012225333A (en) | Flow rate estimation device | |
| JP4030166B2 (en) | Intake air amount detection device for internal combustion engine | |
| CN117869089A (en) | Exhaust gas flow calculation method and device of exhaust gas recirculation system, medium and ECU |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |