CN106224133A - EGR pipeline fault detection method - Google Patents
EGR pipeline fault detection method Download PDFInfo
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- CN106224133A CN106224133A CN201610769960.3A CN201610769960A CN106224133A CN 106224133 A CN106224133 A CN 106224133A CN 201610769960 A CN201610769960 A CN 201610769960A CN 106224133 A CN106224133 A CN 106224133A
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Abstract
The invention discloses a kind of EGR pipeline fault detection method, including step: obtain air excess factor value and currently spray into the fuel oil quality M of electromotorOil, calculate air quality M sucking electromotorEmpty=λ * MOil*14.3；The charging efficiency obtained under the admission pressure of motor intake manifold and intake air temperature, engine displacement and the engine operating condition demarcated in advance draws MMixing；Calculate waste gas stream MUseless Nox=MMixing‑MEmpty；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 calculate effective exhaust gas flow deviation MDiffAvrg；If effectively exhaust gas flow deviation MDiffAvrgAbsolute value not less than allow maximum deviation, send fault cues.The method realizes the calculating to EGR exhaust flow, and the numerical value recorded with the exhaust gas flow of existing EGR line compares, it is achieved verifies the exhaust gas flow calculation of existing EGR line, improves the accuracy to EGR line detection.
Description
Technical field
The present invention relates to technical field of engines, specifically, relate to a kind of EGR pipeline fault detection method.
Background technology
Europe six diesel engine EGR (waste gas recirculation) controls to calculate exhaust gas flow based on Venturi tube and carries out closed loop control, literary composition
The sensor needed that calculates of venturi exhaust gas flow includes: the differential pressure pickup between venturi tube inlet and aditus laryngis, Wen Qiu
In tube inlet pressure transducer, venturi tube inlet exhaust gas temperature sensor.Presently, there are the leak detection method of EGR line,
Be by under steady state condition give one sinusoidal excitation signal of EGR valve, detection feedback pressure mode carry out air leakage detection.But
Differential pressure pickup itself there may be null offset, sensor exists measurement error, rigging error even loading error etc. passes
Sensor problem, the exhaust gas flow that Venturi way calculates cannot be verified, and will lead if the exhaust gas flow calculated is inaccurate
The emissions such as it is inaccurate that cause EGR controls, Nox raise, and finally cause post processing load to increase carbamide consumption and too much or cause
The problems such as discharge exceeds standard.
Therefore, how to provide a kind of EGR pipeline fault detection method, to realize the verification that the system of EGR line detects, from
And improve the accuracy to system detection, it is that those skilled in the art are presently required and solve the technical problem that.
Summary of the invention
In view of this, the invention provides a kind of EGR pipeline fault detection method, to realize the system detection of EGR line
Verification, thus improve to system detection accuracy.
For achieving the above object, the present invention provides following technical scheme:
A kind of EGR pipeline fault detection method, it comprises the following steps:
Obtain air excess factor value and currently spray into the fuel oil quality M of electromotorOil, and combine MEmpty=λ * MOil* 14.3,
Calculate air quality M sucking electromotorEmpty；
Obtain the admission pressure of motor intake manifold and intake air temperature, engine displacement and the electromotor work demarcated in advance
Charging efficiency under condition is also set up physical model and is calculated, and draws MMixing；
Calculate exhaust gas flow MUseless Nox, MUseless Nox=MMixing-MEmpty；
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 calculate effective exhaust gas flow deviation MDiffAvrg；
If effectively exhaust gas flow deviation MDiffAvrgAbsolute value not less than allow maximum deviation, then send fault cues.
Preferably, in above-mentioned EGR pipeline fault detection method, obtain air excess factor value by Nox sensor.
Preferably, in above-mentioned EGR pipeline fault detection method, obtain described electromotor by the first pressure transducer and enter
The admission pressure of gas manifold, the first temperature sensor obtains intake air temperature.
Preferably, in above-mentioned EGR pipeline fault detection method, described EGR line system detecting device includes:
Obtain the differential pressure pickup of pressure between venturi tube inlet and aditus laryngis；
Obtain the second pressure transducer of venturi tube inlet pressure；
Obtain the second temperature sensor of venturi tube inlet EGT；
For calculating exhaust gas flow MUseless VenDltPComputing module.
Preferably, in above-mentioned EGR pipeline fault detection method, obtain the waste gas that EGR line system detecting device obtains
Flow MUseless VenDltPIncluding step:
Judge the differential pressure pickup between venturi tube inlet and aditus laryngis, the second pressure transducer of venturi tube inlet and
Whether the second temperature sensor three of venturi tube inlet EGT has electric fault；
If described second pressure transducer, described second temperature sensor and the equal fault-free of described differential pressure pickup, distinguish
Obtain pressure reduction, the pressure of venturi tube inlet and the venturi tube inlet EGT between venturi tube inlet and aditus laryngis, and
Exhaust gas flow M is calculated according to the data recordedUseless VenDltP。
Preferably, in above-mentioned EGR pipeline fault detection method, use Bernoulli equation to calculate and flow through the useless of Venturi tube
Throughput MUseless VenDltP。
Preferably, in above-mentioned EGR pipeline fault detection method, store exhaust gas flow deviation M at least twiceDiffAnd calculate
Draw effective exhaust gas flow deviation MDiffAvrg；
Calculate effective exhaust gas flow MUseless=MDiffAvrg+MUseless VenDltP。
Understand via above-mentioned technical scheme, the invention discloses a kind of EGR pipeline fault detection method, including following step
Rapid: to obtain air excess factor value and currently spray into the fuel oil quality M of electromotorOil, and combine MEmpty=λ * MOil* 14.3, calculate
Go out to suck air quality M of electromotorEmpty；Obtain the admission pressure of motor intake manifold and intake air temperature, engine displacement and
Charging efficiency under each operating mode of the electromotor demarcated in advance is also set up physical model and is calculated, and draws MMixing；Calculate useless
Throughput MUseless Nox, MUseless Nox=MMixing-MEmpty；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 calculate effective exhaust gas flow
Deviation MDiffAvrg；If effectively exhaust gas flow deviation MDiffAvrgAbsolute value not less than allow maximum deviation, then send fault and carry
Show.The fault detection method of above-mentioned offer can realize the calculating to EGR exhaust flow, and fills with the system of existing EGR line
Put the numerical value recorded to compare, thus realize the verification that the system to existing EGR line detects, improve EGR line
The accuracy of detection.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to
The accompanying drawing provided obtains other accompanying drawing.
The flow chart of the EGR pipeline fault detection method that Fig. 1 provides for the embodiment of the present invention.
Detailed description of the invention
The core of the present invention is to provide a kind of EGR pipeline fault detection method, to realize the school that the system of EGR line detects
Test, thus improve the accuracy to system detection.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
As it is shown in figure 1, the present invention discloses a kind of EGR pipeline fault detection method, comprise the following steps:
Step S1:ECU initializes.
Start ECU (electronic control unit), make electromotor in running order.
Step S2: wait steady state release operating mode.
After initializing electronic control component, continue for some time, make electromotor be in normal table duty.
Step S3: judge whether to meet steady state release condition.
Can first determine 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 being electric fault that the sensor to EGR line system detecting device or connection line can be needed to carry out
Maintenance or replacing, and continue executing with step S2.
Step S4: according to Nox sensor measurement air quality MEmpty, calculate M according to admission pressure P, temperature TMixed, calculate
MUseless Nox, calculate M according to EGR line system detecting deviceUseless VenDltP, calculate multiple exhausted air quantity deviation MDiff。
Obtain air excess factor value and currently spray into the fuel oil quality M of electromotorOil, and combine MEmpty=λ * MOil* 14.3,
Calculate air quality M sucking electromotorEmpty。
Obtain the admission pressure P of motor intake manifold and intake air temperature T, engine displacement and the electromotor demarcated in advance
Charging efficiency under each operating mode is also set up physical model and is calculated, and draws MMixing。
Calculate exhaust gas flow MUseless Nox, MUseless Nox=MMixing-MEmpty。
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 MDiffMeansigma methods MDiffAvrgWhether more than tolerance maximum.
If effectively exhaust gas flow deviation MDiffAvrgAbsolute value not less than allow maximum deviation, then send fault cues,
I.e. | MDiffAvrg| >=MDiffMax, then judge that the sensor that EGR line system detecting device comprises exists manufacture deviation, zero point drift
Shifting amount is excessive, the equiprobable problem of setup error, needs to quote corresponding EGR line system detecting device failure system fault and carries
Show or carry out other troubleshootings.
If less than the maximum deflection difference value allowed, then what explanation detected meets the requirements, and waits under ECU (electronic control unit)
Electricity.
The fault detection method of above-mentioned offer can realize the calculating to EGR exhaust flow, and with existing EGR line be
Bulk cargo is put the numerical value recorded and is compared, thus realizes the verification that the system to existing EGR line detects, and improves EGR
The accuracy of pipeline detection.
Measurement to air system λ value disclosed herein can be recorded by Nox sensor.Nox sensor is calculated
Oxygen concentration O2rIt is converted into air excess factor value or sensor itself directly provides air excess factor value, current oil spout
Amount MOilThe known quantity controlled for electromotor, by λ and MOilSubstitute into formula and obtain the air quality needed for engine combustion, i.e. suck and send out
Air quality M of motivationEmpty=λ * MOil*14.3。
The total air inflow of present engine (waste gas and fresh air total amount) MAlwaysAccording to starting that the first pressure transducer records
Admission pressure P at machine inlet manifold and intake air temperature T of the motor intake manifold of the first temperature sensor acquisition, additionally
Charging efficiency Fac under engine displacement V according to electromotor, each operating mode of electromotor demarcated in advance also sets up physical model
Calculating, result of calculation is MMixing.The method of prior art is measured as this part refer to existing disclosed method and enter
Row is measured, and the application is not specifically limited.
Disclosed EGR line system detecting device is included: obtain the pressure of pressure between venturi tube inlet and aditus laryngis
Gap sensor；Obtain the second pressure transducer of venturi tube inlet pressure；Obtain the second of venturi tube inlet EGT
Temperature sensor；For calculating exhaust gas flow MUseless VenDltPComputing module.This EGR line system detecting device is existing known
A kind of computational methods, the purpose of detection method disclosed herein be to EGR line system detecting device detection knot
Fruit verifies, to reach the accuracy of detection.
Obtain the exhaust gas flow M that EGR line system detecting device obtainsUseless VenDltPIncluding step:
Judge the differential pressure pickup between venturi tube inlet and aditus laryngis, the second pressure transducer of venturi tube inlet and
Whether the second temperature sensor three of venturi tube inlet EGT has electric fault；
If described second pressure transducer, described second temperature sensor and the equal fault-free of described differential pressure pickup, distinguish
Obtain pressure reduction, the pressure of venturi tube inlet and the venturi tube inlet EGT between venturi tube inlet and aditus laryngis, and
Exhaust gas flow M is calculated according to the data recordedUseless VenDltP。
For calculating exhaust gas flow MUseless VenDltPComputational methods Bernoulli equation can be used to calculate.
The M calculated by Nox sensorUseless NoxThe exhaust gas flow M obtained with EGR line system detecting deviceUseless VenDltPEnter
Row deviation is calculated exhaust gas flow deviation MDiff=MUseless Nox-MUseless VenDltP, calculate at least twice and to obtain effective exhaust gas flow inclined
Difference MDiffAvrg, according to the exhaust gas flow of the exhaust gas flow deviation value correction current Venturi way calculating calculated, result finally has
The exhaust gas flow M of effectUseless=MDiffAvrg+MUselessVenDltP。
In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is and other
The difference of embodiment, between each embodiment, identical similar portion sees mutually.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple amendment to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty phase one
The widest scope caused.
Claims (7)
1. an EGR pipeline fault detection method, it is characterised in that comprise the following steps:
Obtain air excess factor value and currently spray into the fuel oil quality M of electromotorOil, and combine MEmpty=λ * MOil* 14.3, calculate
Draw air quality M sucking electromotorEmpty；
Obtain under the admission pressure of motor intake manifold and intake air temperature, engine displacement and the engine operating condition demarcated in advance
Charging efficiency and set up physical model and calculate, draw MMixing；
Calculate exhaust gas flow MUseless Nox, MUseless Nox=MMixing-MEmpty；
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 calculate effective exhaust gas flow deviation MDiffAvrg；
If effectively exhaust gas flow deviation MDiffAvrgAbsolute value not less than allow maximum deviation, then send fault cues.
EGR pipeline fault detection method the most according to claim 1, it is characterised in that obtain excess by Nox sensor
Air coefficient λ value.
EGR pipeline fault detection method the most according to claim 1, it is characterised in that obtained by the first pressure transducer
Taking the admission pressure of described motor intake manifold, the first temperature sensor obtains intake air temperature.
EGR pipeline fault detection method the most according to claim 1, it is characterised in that described EGR line system detection dress
Put and include:
Obtain the differential pressure pickup of pressure between venturi tube inlet and aditus laryngis；
Obtain the second pressure transducer of venturi tube inlet pressure；
Obtain the second temperature sensor of venturi tube inlet EGT；
For calculating exhaust gas flow MUseless VenDltPComputing module.
EGR pipeline fault detection method the most according to claim 4, it is characterised in that obtain EGR line system detection dress
Put the exhaust gas flow M obtainedUseless VenDltPIncluding step:
Judge the differential pressure pickup between venturi tube inlet and aditus laryngis, the second pressure transducer of venturi tube inlet and Wen Qiu
In the second temperature sensor three of tube inlet EGT whether have electric fault；
If described second pressure transducer, described second temperature sensor and the equal fault-free of described differential pressure pickup, obtain respectively
Pressure reduction, the pressure of venturi tube inlet and venturi tube inlet EGT between venturi tube inlet and aditus laryngis, and according to
The data recorded calculate exhaust gas flow MUseless VenDltP。
EGR pipeline fault detection method the most according to claim 5, it is characterised in that use Bernoulli equation to calculate stream
Cross the exhaust gas flow M of Venturi tubeUseless VenDltP。
EGR pipeline fault detection method the most according to claim 1, it is characterised in that store exhaust gas flow at least twice
Deviation MDiffAnd calculate effective exhaust gas flow deviation MDiffAvrg；
Calculate effective exhaust gas flow MUseless=MDiffAvrg+MUseless VenDltP。
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281776A (en) * | 2018-11-29 | 2019-01-29 | 潍柴动力股份有限公司 | A kind of exhaust gas recirculation 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 |
| CN111006867A (en) * | 2019-11-26 | 2020-04-14 | 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 |
| CN111042956A (en) * | 2019-12-26 | 2020-04-21 | 潍柴动力股份有限公司 | EGR flow fault judgment method, device and equipment |
| CN111928925A (en) * | 2020-07-16 | 2020-11-13 | 中广核核电运营有限公司 | Venturi tube fault correction method and device, computer equipment and storage medium |
| CN113250864A (en) * | 2020-02-12 | 2021-08-13 | 广州汽车集团股份有限公司 | EGR flow diagnosis method and system and automobile |
| CN113719364A (en) * | 2020-05-21 | 2021-11-30 | 广州汽车集团股份有限公司 | Method and device for determining EGR mass flow |
| CN115199427A (en) * | 2021-04-07 | 2022-10-18 | 大众汽车股份公司 | Diagnostic method, control device and motor vehicle |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281776A (en) * | 2018-11-29 | 2019-01-29 | 潍柴动力股份有限公司 | A kind of exhaust gas recirculation 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 |
| CN111006867A (en) * | 2019-11-26 | 2020-04-14 | 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 |
| 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 |
| CN111042956A (en) * | 2019-12-26 | 2020-04-21 | 潍柴动力股份有限公司 | EGR flow fault judgment method, device and equipment |
| 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 |
| CN113250864A (en) * | 2020-02-12 | 2021-08-13 | 广州汽车集团股份有限公司 | EGR flow diagnosis method and system and automobile |
| 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 |
| CN113719364A (en) * | 2020-05-21 | 2021-11-30 | 广州汽车集团股份有限公司 | Method and device for determining EGR mass flow |
| 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 |
| CN111928925A (en) * | 2020-07-16 | 2020-11-13 | 中广核核电运营有限公司 | Venturi tube fault correction method and device, computer equipment and storage medium |
| WO2022012083A1 (en) * | 2020-07-16 | 2022-01-20 | 中广核核电运营有限公司 | Venturi tube fault correction method and apparatus, computer device and storage medium |
| CN115199427A (en) * | 2021-04-07 | 2022-10-18 | 大众汽车股份公司 | Diagnostic method, control device and motor vehicle |
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| CN106224133B (en) | 2018-08-31 |
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