CN106837618A - Judge the method and egr system of the cooling effectiveness deterioration of cooler for recycled exhaust gas - Google Patents
Judge the method and egr system of the cooling effectiveness deterioration of cooler for recycled exhaust gas Download PDFInfo
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- CN106837618A CN106837618A CN201611218271.XA CN201611218271A CN106837618A CN 106837618 A CN106837618 A CN 106837618A CN 201611218271 A CN201611218271 A CN 201611218271A CN 106837618 A CN106837618 A CN 106837618A
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Abstract
The invention provides the method and egr system that judge that the cooling effectiveness of cooler for recycled exhaust gas is deteriorated, the change of cooler for recycled exhaust gas cooling effectiveness is judged by the high temperature and low temperature environment residing for cooler for recycled exhaust gas and the deterioration factor of cooler for recycled exhaust gas is judged, deterioration factor according to cooler for recycled exhaust gas determines NOx emission deterioration factor, and based on NOx emission deterioration factor amendment fuel injection amount or air inflow come adjust engine original machine discharge, so as to the discharge influence that effectively control cooler for recycled exhaust gas efficiency descent tape is come, the method and egr system that the present invention is provided are conducive to being lifted the discharge uniformity of product.
Description
Technical field
The present invention relates to EGR treatment technologies, particularly judge the cooling effectiveness deterioration of cooler for recycled exhaust gas method and
Egr system.
Background technology
Waste gas recycling (Exhaust Gas Recirculation, abbreviation EGR) is to produce diesel engine or gasoline engine
A part for waste gas draws gas exhaust piping, and appropriate waste gas is introduced into air inlet pipeline by a control valve, such as EGR valve
Mix with fresh air, enter back into a kind of emission control technique that combustion chamber participates in burning.It is substantial amounts of due to containing in waste gas
CO2, and CO2 can not burn and absorb substantial amounts of heat, and then the ignition temperature of gaseous mixture in cylinder is reduced, so as to reduce
The growing amount of NOx.
Generally, the waste gas from combustion chamber discharge is required for using cooler for recycled exhaust gas to be cooled down to reduce the temperature of waste gas,
So as to help to reduce NOx emission.However, cooler for recycled exhaust gas runs on excessive temperature and crosses low temperature can all influence cooler for recycled exhaust gas
Efficiency, thus cooler for recycled exhaust gas works under high temperature and low-temperature working environment and cooler for recycled exhaust gas efficiency can be caused to decline, and then makes
Cooler for recycled exhaust gas is aging, so as to influence NOx emission, this influences larger to engine emission uniformity.
The content of the invention
It is an object of the invention to provide the change that can timely and effectively judge cooler for recycled exhaust gas cooling effectiveness, effective control
The method and system of the discharge influence that cooler for recycled exhaust gas efficiency descent tape is come.These purposes are achieved through the following technical solutions.
The invention provides a kind of method of the cooling effectiveness deterioration for judging cooler for recycled exhaust gas, methods described includes following step
Suddenly：
S1：The EGT T of cooler for recycled exhaust gas entrance when being run using temperature sensor detection cooler for recycled exhaust gas；
S2：Electronic control unit receives the EGT T of cooler for recycled exhaust gas entrance that measures and by itself and high temperature threshold value T1Than
Compared with if T is more than T1, then electronic control unit calculate high-temperature duration t1；
S3：If T is less than T1, then by T and low temperature threshold T2Compare, if T is less than T2, then electronic control unit calculate low temperature hold
Continuous time t2；
S4：According to high-temperature duration t1To determine the high temperature deterioration coefficient n of cooler for recycled exhaust gas1, according to the low temperature continuous time
t2To determine the low-temperature degradation coefficient n of cooler for recycled exhaust gas2；
S5：According to high temperature deterioration coefficient n1With low-temperature degradation coefficient n2To determine cooler for recycled exhaust gas deterioration factor.
Further, cooler for recycled exhaust gas deterioration factor=(t1/N1)*n1*α+(t2/N2)*n2* β, wherein, alpha+beta=1 and α and β
It is all higher than zero, N1Lasting duration, N when carrying out high temperature limit long duration test for cooler for recycled exhaust gas2For cooler for recycled exhaust gas carries out low temperature pole
Lasting duration during limit long duration test, unit is hour.
Further, methods described also includes：Bench calibration is carried out to NOx emission based on cooler for recycled exhaust gas deterioration factor, is obtained
To NOx emission Bench calibration value and by it divided by the NOx emission value under the reset condition of cooler for recycled exhaust gas, so as to obtain NOx rows
Put deterioration factor.
Further, methods described also includes：Fuel injection amount or air inlet are corrected according to the NOx emission deterioration factor
Amount.
Further, T1 is 180 DEG C~220 DEG C, in particular 200 DEG C, and T2 is 70 DEG C~90 DEG C, in particular 80 DEG C.
Further, the high temperature deterioration coefficient n1Obtain in the following way：N is carried out continuously to cooler for recycled exhaust gas1Hour
High temperature limit long duration test, then measure cooler for recycled exhaust gas cooling effectiveness and by its divided by cooler for recycled exhaust gas reset condition
Cooling effectiveness.The low-temperature degradation coefficient n2Obtain in the following way：N is carried out continuously to cooler for recycled exhaust gas2The low temperature pole of hour
Limit long duration test, then measures the cooling effectiveness of cooler for recycled exhaust gas and imitates its cooling divided by the reset condition of cooler for recycled exhaust gas
Rate.
Further, α and β are 0.5.
Present invention also offers a kind of egr system, the egr system includes cooler for recycled exhaust gas, detection cooler for recycled exhaust gas entrance
The temperature sensor and EGR valve of temperature, the egr system also include electronic control unit, the electronic control unit configuration
Into the method for the cooling effectiveness deterioration for performing previously described judgement cooler for recycled exhaust gas.
The advantage of the invention is that：
The present invention judges the change of cooler for recycled exhaust gas cooling effectiveness, root by the high temperature and low temperature environment residing for cooler for recycled exhaust gas
Discharged according to the change adjustment engine original machine of cooler for recycled exhaust gas cooling effectiveness, so that effectively control cooler for recycled exhaust gas efficiency descent tape is come
Discharge influence, with the upgrading of emission request, the method and egr system that the present invention is provided are conducive to being lifted the discharge one of product
Cause property.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 shows the egr system combined with engine according to embodiment of the present invention；
Fig. 2 shows the general flow chart that cooler for recycled exhaust gas cooling effectiveness is deteriorated that judges according to embodiment of the present invention.
Reference in accompanying drawing is as follows：10- air inlets；20- charge air coolers；30- intake-air throttle valves；E- engines；40-EGR
Cooler；50- temperature sensors；60-EGR valves；70- turbocharger；80- is vented
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in accompanying drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.Conversely, there is provided these implementation methods are able to be best understood from the disclosure, and can be by this public affairs
The scope opened it is complete convey to those skilled in the art.
Hereinafter with reference to Fig. 1 descriptions egr system combined with engine according to the embodiment of the present invention.Such as Fig. 1 institutes
Show, egr system at least includes cooler for recycled exhaust gas 40, temperature sensor 50 and EGR valve 60, the egr system also includes electronics in addition
Control unit, the electronic control unit is configured with time memory, the temperature that the time memory is measured according to temperature sensor 50
The time of degree storage EGR courses of work high temperature and low temperature continuous.
Specifically, the whole EGR courses of work are as follows：Air inlet 10 is entered by air inlet pipeline, and by turbocharger 70
Supercharging, subsequent air inlet cooled down by charge air cooler 20 after by the way that intake-air throttle valve 30 controls flow after into engine E, in such as Fig. 1 on
Shown in the direction of arrow shown in side.Air inlet enters engine E and participates in burning, and a part for the waste gas for producing that burns is cold via EGR
But device entrance is cooled down into cooler for recycled exhaust gas 40, and subsequent this portion enters after controlling flow via EGR valve 60 with follow-up
Gas mixing together enters engine E, meanwhile, temperature sensor 50 detects the EGT of cooler for recycled exhaust gas entrance, Electronic Control list
Unit collection exhaust gas temperature value and judge the exhaust gas temperature value whether more than high temperature threshold value T1 or less than low temperature threshold T2 and calculating adopt
The exhaust gas temperature value for collecting is more than high temperature threshold value T1 or less than low temperature threshold T2 durations.Burn produce waste gas it is another
A part is discharged via gas exhaust piping by turbocharger 70 and after driving turbocharger 70 to compress air inlet as exhaust 80,
Shown in the direction of arrow as shown in lower section in Fig. 1.
Now, the control flow of egr system is described with reference to Fig. 1 and Fig. 2.As shown in Fig. 2 engine operation and
During egr system runs, judge that the method for the cooling effectiveness deterioration of cooler for recycled exhaust gas comprises the following steps：
S1：The EGT T of cooler for recycled exhaust gas entrance when being run using the detection cooler for recycled exhaust gas 40 of temperature sensor 50；
S2：Electronic control unit receives the EGT T of cooler for recycled exhaust gas entrance that measures and by itself and high temperature threshold value T1Than
Compared with if T is more than T1, then electronic control unit calculate high-temperature duration t1；
S3：If T is less than T1, then by T and low temperature threshold T2Compare, if T is less than T2, then electronic control unit calculate low temperature hold
Continuous time t2；
S4：According to high-temperature duration t1To determine the high temperature deterioration coefficient n of cooler for recycled exhaust gas1, according to the low temperature continuous time
t2To determine the low-temperature degradation coefficient n of cooler for recycled exhaust gas2；
S5：According to high temperature deterioration coefficient n1With low-temperature degradation coefficient n2To determine cooler for recycled exhaust gas deterioration factor.
Especially, cooler for recycled exhaust gas deterioration factor=(t1/N)*n1*α+(t2/N)*n2* β, wherein, alpha+beta=1 and α and β are equal
More than zero, N1Lasting duration (that is, carries out high temperature pole in cooler for recycled exhaust gas when carrying out high temperature limit long duration test for cooler for recycled exhaust gas
Substantially without cooling effect during limit long duration test duration N), N2Continue when carrying out low temperature limit long duration test for cooler for recycled exhaust gas
Duration (that is, when cooler for recycled exhaust gas carries out low temperature limit long duration test duration N substantially without cooling effect), unit is
Hour.
Wherein, T1 is 180 DEG C~220 DEG C, in particular 200 DEG C, and T2 is 70 DEG C~90 DEG C, in particular 80 DEG C, and α and β are
0.5.In addition, the high temperature deterioration coefficient n1Obtain in the following way：N is carried out continuously to cooler for recycled exhaust gas1The high temperature pole of hour
Limit long duration test, then measures the cooling effectiveness of cooler for recycled exhaust gas and imitates its cooling divided by the reset condition of cooler for recycled exhaust gas
Rate.The low-temperature degradation coefficient n2Obtain in the following way：N is carried out continuously to cooler for recycled exhaust gas2The low temperature limit of hour is durable
Experiment, then measure cooler for recycled exhaust gas cooling effectiveness and by its divided by the reset condition of cooler for recycled exhaust gas cooling effectiveness.
Methods described also includes：Bench calibration is carried out to NOx emission based on cooler for recycled exhaust gas deterioration factor, NOx emission is obtained
Bench calibration value and by it divided by the NOx emission value under the reset condition of cooler for recycled exhaust gas, so as to obtain NOx emission deterioration system
Number.Additionally, methods described also includes：Fuel injection amount or air inflow are corrected according to the NOx emission deterioration factor.
The present invention judges the change of cooler for recycled exhaust gas cooling effectiveness, root by the high temperature and low temperature environment residing for cooler for recycled exhaust gas
Discharged according to the change adjustment engine original machine of cooler for recycled exhaust gas cooling effectiveness, so that effectively control cooler for recycled exhaust gas efficiency descent tape is come
Discharge influence, with the upgrading of emission request, the method and egr system that the present invention is provided are conducive to being lifted the discharge one of product
Cause property.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
Should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Enclose and be defined.
Claims (10)
1. a kind of method that cooling effectiveness for judging cooler for recycled exhaust gas is deteriorated, it is characterised in that methods described comprises the following steps：
S1：The EGT T of cooler for recycled exhaust gas entrance when being run using temperature sensor detection cooler for recycled exhaust gas；
S2：Electronic control unit receives the EGT T of cooler for recycled exhaust gas entrance that measures and by itself and high temperature threshold value T1Compare, if
T is more than T1, then electronic control unit calculate high-temperature duration t1；
S3：If T is less than T1, then by T and low temperature threshold T2Compare, if T is less than T2, then when electronic control unit calculates low temperature continuous
Between t2；
S4：According to high-temperature duration t1To determine the high temperature deterioration coefficient n of cooler for recycled exhaust gas1, according to low temperature continuous time t2Come
Determine the low-temperature degradation coefficient n of cooler for recycled exhaust gas2；
S5：According to high temperature deterioration coefficient n1With low-temperature degradation coefficient n2To determine cooler for recycled exhaust gas deterioration factor.
2. method according to claim 1, it is characterised in that the cooler for recycled exhaust gas deterioration factor=(t1/N1)*n1*α+
(t2/N2)*n2* β, wherein, alpha+beta=1 and α and β are all higher than zero, N1Continue when carrying out high temperature limit long duration test for cooler for recycled exhaust gas
Duration, N2Lasting duration when carrying out low temperature limit long duration test for cooler for recycled exhaust gas, unit is hour.
3. method according to claim 1, it is characterised in that methods described also includes：Based on cooler for recycled exhaust gas deterioration factor
Bench calibration is carried out to NOx emission, NOx emission Bench calibration value is obtained and by it divided by under the reset condition of cooler for recycled exhaust gas
NOx emission value, so as to obtain NOx emission deterioration factor.
4. method according to claim 3, it is characterised in that methods described also includes：Deteriorated according to the NOx emission and be
Count to correct fuel injection amount or air inflow.
5. according to the method that any one of Claims 1-4 is described, it is characterised in that T1 is 180 DEG C~220 DEG C, and T2 is 70
DEG C~90 DEG C.
6. method according to claim 5, it is characterised in that T1 is 200 DEG C, T2 is 80 DEG C.
7. according to the method that any one of Claims 1-4 is described, it is characterised in that the high temperature deterioration coefficient n1By such as
Under type is obtained：N is carried out continuously to cooler for recycled exhaust gas1The high temperature limit long duration test of hour, then measures the cold of cooler for recycled exhaust gas
But efficiency and by its divided by the reset condition of cooler for recycled exhaust gas cooling effectiveness.
8. according to the method that any one of Claims 1-4 is described, it is characterised in that the low-temperature degradation coefficient n2By such as
Under type is obtained：N is carried out continuously to cooler for recycled exhaust gas2The low temperature limit long duration test of hour, then measures the cold of cooler for recycled exhaust gas
But efficiency and by its divided by the reset condition of cooler for recycled exhaust gas cooling effectiveness.
9. method according to claim 2, it is characterised in that α and β are 0.5.
10. a kind of egr system, it is characterised in that the egr system includes cooler for recycled exhaust gas, detection cooler for recycled exhaust gas inlet temperature
Temperature sensor and EGR valve, the egr system also include electronic control unit, the electronic control unit be configured to use
In the method that execution is deteriorated according to the described cooling effectiveness for judging cooler for recycled exhaust gas of any one of claim 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611218271.XA CN106837618B (en) | 2016-12-26 | 2016-12-26 | Judge the method and egr system of the cooling efficiency deterioration of cooler for recycled exhaust gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611218271.XA CN106837618B (en) | 2016-12-26 | 2016-12-26 | Judge the method and egr system of the cooling efficiency deterioration of cooler for recycled exhaust gas |
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| Publication Number | Publication Date |
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| CN106837618A true CN106837618A (en) | 2017-06-13 |
| CN106837618B CN106837618B (en) | 2019-03-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115929518A (en) * | 2022-11-04 | 2023-04-07 | 东风商用车有限公司 | EGR Cooler Fault Early Warning Method |
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|---|---|---|---|---|
| CN101463770A (en) * | 2007-12-20 | 2009-06-24 | 三菱扶桑卡客车株式会社 | Exhaust purification apparatus for engine |
| JP2010275871A (en) * | 2009-05-26 | 2010-12-09 | Hitachi Automotive Systems Ltd | Engine control device |
| CN102011633A (en) * | 2010-12-22 | 2011-04-13 | 潍柴动力股份有限公司 | Durability evaluating method of selective catalytic reduction (SCR) catalytic converter |
| US20130180508A1 (en) * | 2010-05-27 | 2013-07-18 | International Engine Intellectual Property Company Llc | System and method of controlling an amount of condensation in an engine air intake system |
| CN104981602A (en) * | 2013-02-12 | 2015-10-14 | 丰田自动车株式会社 | Control device for internal combustion engine |
-
2016
- 2016-12-26 CN CN201611218271.XA patent/CN106837618B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101463770A (en) * | 2007-12-20 | 2009-06-24 | 三菱扶桑卡客车株式会社 | Exhaust purification apparatus for engine |
| JP2010275871A (en) * | 2009-05-26 | 2010-12-09 | Hitachi Automotive Systems Ltd | Engine control device |
| US20130180508A1 (en) * | 2010-05-27 | 2013-07-18 | International Engine Intellectual Property Company Llc | System and method of controlling an amount of condensation in an engine air intake system |
| CN102011633A (en) * | 2010-12-22 | 2011-04-13 | 潍柴动力股份有限公司 | Durability evaluating method of selective catalytic reduction (SCR) catalytic converter |
| CN104981602A (en) * | 2013-02-12 | 2015-10-14 | 丰田自动车株式会社 | Control device for internal combustion engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115929518A (en) * | 2022-11-04 | 2023-04-07 | 东风商用车有限公司 | EGR Cooler Fault Early Warning Method |
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| CN106837618B (en) | 2019-03-29 |
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