CN110671176B - Carbon capacity calculation method and calculation module based on oxygen concentration change - Google Patents
Carbon capacity calculation method and calculation module based on oxygen concentration change Download PDFInfo
- Publication number
- CN110671176B CN110671176B CN201910906122.XA CN201910906122A CN110671176B CN 110671176 B CN110671176 B CN 110671176B CN 201910906122 A CN201910906122 A CN 201910906122A CN 110671176 B CN110671176 B CN 110671176B
- Authority
- CN
- China
- Prior art keywords
- oxygen concentration
- working condition
- carbon
- under
- current working
- 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
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
-
- 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
Abstract
The invention discloses a carbon capacity calculation method and a calculation module based on oxygen concentration change, wherein the calculation method comprises the following steps: searching an oxygen concentration set value under the current working condition from an oxygen concentration MAP (MAP) based on the rotating speed n of the engine under the current working condition and the fuel injection quantity q of the fuel injector; obtaining oxygen concentration deviation according to the actual oxygen concentration value and the set oxygen concentration value; searching a model correction coefficient fac under the current working condition from a model correction MAP graph based on the oxygen concentration deviation and the fuel injection quantity q; and obtaining a corrected carbon load model calculation value according to the original carbon load model calculation value and the model correction coefficient fac. The calculation module comprises an information acquisition unit, an oxygen concentration set value determination unit, an oxygen concentration deviation determination unit, a correction unit and a corrected carbon load model calculation unit which are used for implementing the steps. The method can accurately calculate the accumulated carbon loading capacity of the DPF, is convenient for correct regeneration, protects the DPF filter from being blocked and damaged, and ensures the normal running of the vehicle.
Description
Technical Field
The invention belongs to the technical field of diesel engine tail gas aftertreatment, and particularly relates to a carbon loading capacity calculation method and a calculation module based on oxygen concentration change.
Background
Faults such as abrasion of spray holes of the oil sprayer, blockage of the spray holes, clamping stagnation of the oil sprayer and the like are caused when the quality of market oil products or diesel filters does not reach the standard; faults such as air leakage and blockage of an engine supercharger and an intake intercooling pipeline; these oil and gas path related faults can cause the actual fuel injection amount or the actual air intake amount to change, thereby influencing combustion, and causing the soot emission in the engine exhaust to exceed or fall below a normal level (namely causing the oxygen concentration in the engine exhaust to change).
In the existing control strategy, the change of the soot level of the engine caused by the related fault reason of the oil path and the gas path of the engine is not considered. Therefore, when the oil path and the gas path are in failure, the estimation of the original carbon loading capacity of the DPF (the calculation value of the original carbon loading capacity model) is inaccurate, and the subsequent regeneration process cannot be correctly performed (the process of removing the carbon loading capacity after the accumulated carbon loading capacity of the DPF filter reaches a certain degree). When actual fuel injection quantity increases or actual air inflow diminishes, when the soot level in the waste gas risees, the carbon loading capacity estimation is not enough, and the vehicle continues to travel, can lead to DPF filter to block up, and vehicle power is not enough, and DPF filter's carrier moves backward. When the model estimates that regeneration is needed, the actual carbon loading level in the DPF filter exceeds the safe regeneration threshold, and if regeneration is carried out at the moment, the temperature is too high, the generated thermal stress is too large, and the carrier can be burnt and cracked. The phenomena of DPF filter blockage, carrier burning and carrier backward movement are frequently generated in the market.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention solves the first technical problem of providing the carbon carrying capacity calculation method based on the oxygen concentration change, which can correctly calculate the carbon carrying capacity according to the oxygen concentration change of the related fault of the engine oil circuit and the gas circuit, is convenient for carrying out correct regeneration according to the actual carbon carrying capacity subsequently, protects the DPF filter from being blocked and damaged, and ensures the normal running of a vehicle.
As the same technical concept, the second technical problem solved by the present invention is to provide a carbon load calculation module based on oxygen concentration variation.
In order to solve the first technical problem, the present invention provides a carbon load calculation method based on oxygen concentration variation, wherein the carbon load calculation method includes:
s1, based on the rotating speed n of the engine and the fuel injection quantity q of the fuel injector under the current working condition, finding out the oxygen concentration set value under the current working condition from a pre-calibrated oxygen concentration MAP;
s2, measuring an actual oxygen concentration value under the current working condition by the oxygen sensor, and obtaining an oxygen concentration deviation according to the actual oxygen concentration value and the searched set oxygen concentration value;
s3, based on the oxygen concentration deviation and the fuel injection quantity q under the current working condition, finding out a model correction coefficient fac under the current working condition from a pre-calibrated model correction MAP;
and S4, obtaining the corrected carbon load model calculation value according to the original carbon load model calculation value and the searched model correction coefficient fac.
Further, the calculation formula of the corrected carbon load model calculation value is as follows:
the corrected carbon load model calculated value is the original carbon load model calculated value + the model correction coefficient fac × the original carbon load model calculated value.
Further, step S4 includes:
s41, based on the pressure difference between two ends of the DPF filter and the engine exhaust gas flow under the current working condition, or based on the rotating speed n and the fuel injection quantity q under the current working condition; and searching the carbon accumulation rate under the current working condition from a corresponding pre-calibrated carbon accumulation rate MAP, and performing accumulation integral calculation according to the duration of the working condition to obtain the calculated value of the original carbon loading model.
Further, step S4 includes:
s41, based on the pressure difference at two ends of the DPF filter and the engine exhaust gas flow under the current working condition, or based on the rotating speed n and the fuel injection quantity q under the current working condition, finding out the carbon accumulation rate under the current working condition from a corresponding carbon accumulation rate MAP (MAP) calibrated in advance, and calculating the carbon loading capacity according to the continuous time accumulation integral of the working condition;
s42, determining an environment correction coefficient a according to at least one of the environment pressure, the environment humidity, the air inlet temperature under the current working condition and the coolant temperature;
and S43, obtaining the original carbon load model calculation value according to the calculated carbon load and the determined environment correction coefficient a.
Further, step S4 further includes:
s40, performing an engine bench test based on different simulated working conditions, and calibrating characteristic curves of pressure difference at two ends of a DPF filter, engine exhaust gas flow and carbon accumulation rate under different working conditions, or calibrating characteristic curves of rotating speed n, fuel injection quantity q and carbon accumulation rate under different working conditions; the characteristic curve is defined as the carbon accumulation rate MAP; the carbon accumulation rate MAP is stored in advance in an engine electronic control unit.
Further, step S1 includes:
carrying out engine bench tests based on different simulated working conditions, and calibrating characteristic curves of the rotating speed n, the fuel injection quantity q and the oxygen concentration under different working conditions, wherein the characteristic curves are defined as an oxygen concentration MAP; the oxygen concentration MAP is stored in advance in an engine electronic control unit.
Further, step S3 includes:
carrying out engine pedestal test based on different simulated working conditions, calibrating characteristic curves of fuel injection quantity q, oxygen concentration deviation and model correction coefficient fac under different working conditions, and defining the characteristic curves as the model correction MAP; and storing the model correction MAP in an engine electronic control unit in advance.
In order to solve the second technical problem, the present invention provides a carbon load calculation module based on oxygen concentration variation, wherein the carbon load calculation module includes:
the information acquisition unit is used for acquiring the rotating speed n of the engine, the fuel injection quantity q of the fuel injector and the actual value of the oxygen concentration under the current working condition;
the oxygen concentration set value determining unit is used for searching an oxygen concentration set value under the current working condition from a pre-calibrated oxygen concentration MAP (MAP) based on the rotating speed n and the fuel injection quantity q under the current working condition;
the oxygen concentration deviation determining unit is used for obtaining oxygen concentration deviation according to the oxygen concentration actual value and the searched oxygen concentration set value;
the correction unit is used for searching a model correction coefficient fac under the current working condition from a pre-calibrated model correction MAP (MAP) based on the oxygen concentration deviation and the fuel injection quantity q under the current working condition;
and the corrected carbon load model calculation unit is used for obtaining a corrected carbon load model calculation value according to the original carbon load model calculation value and the searched model correction coefficient fac.
And further, the system is also used for acquiring the ambient pressure, the ambient humidity, the pressure difference at two ends of the DPF filter under the current working condition, the air inlet temperature and the cooling liquid temperature.
Further, the carbon loading calculation module further comprises:
the original carbon load model calculation unit is based on the pressure difference at two ends of the DPF filter and the engine exhaust gas flow under the current working condition, or based on the rotating speed n and the fuel injection quantity q under the current working condition; finding out the carbon accumulation rate under the current working condition from a corresponding carbon accumulation rate MAP chart calibrated in advance, and calculating the carbon loading capacity according to the accumulated integral of the duration time of the working condition; then selecting at least one environmental correction coefficient a according to the environmental pressure, the environmental humidity, the air inlet temperature and the cooling liquid temperature; and finally, obtaining an original carbon load model calculation value according to the calculated carbon load and the determined environmental correction coefficient a.
After the technical scheme is adopted, the invention has the beneficial effects that:
the invention relates to a carbon carrying capacity calculation method and a calculation module based on oxygen concentration change, wherein the calculation method mainly comprises the steps of searching an oxygen concentration set value under the current working condition from a pre-calibrated oxygen concentration MAP (MAP) based on the rotating speed n of an engine and the fuel injection quantity q of a fuel injector under the current working condition; obtaining oxygen concentration deviation according to the actual value of the oxygen concentration and the searched oxygen concentration set value; based on the oxygen concentration deviation and the fuel injection quantity q under the current working condition, a model correction coefficient fac under the current working condition is found out from a pre-calibrated model correction MAP graph; and obtaining the corrected carbon load model calculation value according to the original carbon load model calculation value and the searched model correction coefficient fac. The calculation module is used for implementing the calculation method.
In short, the phenomenon that the actual fuel injection quantity and the air intake quantity are changed due to the fact that the related faults of an engine oil way and an engine air way cause the change of combustion to cause the change of the soot level of the engine (namely the change of the oxygen concentration) is fully considered, and the correction is carried out on the basis of the change of the oxygen concentration on the basis of the calculation value of the original carbon loading model so as to ensure the accuracy of the calculation of the carbon loading; the subsequent correct regeneration is conveniently carried out according to the actual carbon loading amount, the DPF filter is protected from being blocked and damaged, and the normal running of the vehicle is ensured; and the control method is simple and easy to realize.
Drawings
FIG. 1 is a logic diagram of the carbon load calculation method of the present invention based on changes in oxygen concentration;
FIG. 2 is a detailed flow chart of the carbon loading calculation method based on oxygen concentration variation of the present invention;
FIG. 3 is a detailed flowchart of step S4 in FIG. 2;
FIG. 4 is another detailed flowchart of step S4 in FIG. 2;
FIG. 5 is a block diagram of one configuration of the carbon load calculation module of the present invention based on changes in oxygen concentration;
FIG. 6 is another block diagram of the carbon load calculation module based on oxygen concentration variation according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for convenience in explanation and are not to be construed as limiting the invention.
The first embodiment is as follows:
as shown in fig. 1 to 3, a method for calculating a carbon loading based on a change in oxygen concentration specifically includes the following steps:
s1, based on the rotating speed n of the engine and the fuel injection quantity q of the fuel injector under the current working condition, finding out the oxygen concentration set value ratO2_ set under the current working condition from a pre-calibrated oxygen concentration MAP.
Wherein, step S1 includes: carrying out engine bench tests based on different simulated working conditions, and calibrating characteristic curves of the rotating speed n, the fuel injection quantity q and the oxygen concentration under different working conditions, wherein the characteristic curves are defined as an oxygen concentration MAP; the oxygen concentration MAP is stored in the engine electronic control unit in advance so as to be convenient to search and call.
S2, the oxygen sensor measures the oxygen concentration actual value ratO2_ act under the current working condition, and the oxygen concentration deviation ratO2_ diff is obtained according to the oxygen concentration actual value ratO2_ act and the searched oxygen concentration set value ratO2_ set.
S3, based on the oxygen concentration deviation ratO2_ diff and the fuel injection quantity q under the current working condition, finding out the model correction coefficient fac under the current working condition from a pre-calibrated model correction MAP.
Wherein, step S3 includes: carrying out engine pedestal test based on different simulated working conditions, calibrating characteristic curves of fuel injection quantity q, oxygen concentration deviation and model correction coefficient fac under different working conditions, and defining the characteristic curves as a model correction MAP; and (4) storing the model modified MAP in an engine electronic control unit in advance so as to be convenient for searching and calling.
S4, obtaining a corrected carbon capacity model calculation value root _ fianl according to the original carbon capacity model calculation value root _ base and the searched model correction coefficient fac. The calculation formula of the corrected carbon capacity model calculation value root _ fianl is that the corrected carbon capacity model calculation value root _ fianl is the original carbon capacity model calculation value root _ base + model correction coefficient fac multiplied by the original carbon capacity model calculation value root _ base.
Wherein, step S4 specifically includes:
s40, performing an engine bench test based on different simulated working conditions, and calibrating characteristic curves of pressure difference at two ends of a DPF filter, engine exhaust gas flow and carbon accumulation rate under different working conditions, or calibrating characteristic curves of rotating speed n, fuel injection quantity q and carbon accumulation rate under different working conditions; the characteristic curve is defined as a carbon accumulation rate MAP; the carbon accumulation rate MAP is prestored in the engine electronic control unit so as to be searched and called.
It should be noted that, there are two carbon accumulation rate MAP MAPs, one is a characteristic curve of pressure difference between two ends of the DPF filter, engine exhaust gas flow and carbon accumulation rate under different working conditions; the other is a characteristic curve of the rotating speed n, the fuel injection quantity q and the carbon accumulation rate under different working conditions.
S41, based on the pressure difference between two ends of the DPF filter and the exhaust gas flow under the current working condition, or based on the rotating speed n and the fuel injection quantity q under the current working condition, finding out the carbon accumulation rate under the current working condition from a pre-calibrated corresponding carbon accumulation rate MAP graph, and carrying out accumulation integral calculation according to the duration time of the working condition to obtain the original carbon loading model calculation value root _ base.
The embodiment also discloses a carbon load calculation module based on oxygen concentration change for implementing the calculation method. As shown in fig. 5, the carbon loading calculation module includes:
and the information acquisition unit is used for acquiring the rotating speed n of the engine, the fuel injection quantity q of the fuel injector and the actual oxygen concentration value ratO2_ act under the current working condition.
And the oxygen concentration set value determining unit is used for searching an oxygen concentration set value ratO2_ set under the current working condition from a pre-calibrated oxygen concentration MAP (MAP) based on the rotating speed n and the fuel injection quantity q under the current working condition.
And an oxygen concentration deviation determining unit for obtaining the oxygen concentration deviation ratO2_ diff according to the actual oxygen concentration value ratO2_ act and the oxygen concentration set value ratO2_ set searched by the oxygen concentration set value determining unit.
And the correction unit is used for searching a model correction coefficient fac under the current working condition from a pre-calibrated model correction MAP (MAP) based on the oxygen concentration deviation ratO2_ diff and the fuel injection quantity q under the current working condition.
And the corrected carbon capacity model calculation unit obtains a corrected carbon capacity model calculation value root _ final according to the original carbon capacity model calculation value root _ base and the model correction coefficient fac searched by the correction unit.
Example two:
the concept of the second embodiment is substantially the same as that of the first embodiment, the only difference being that the raw carbon load model calculation value root _ base is more accurate, and only the difference will be described in detail below.
As shown in fig. 4, step S4 includes:
s40, performing an engine bench test based on different simulated working conditions, and calibrating characteristic curves of pressure difference at two ends of a DPF filter, engine exhaust gas flow and carbon accumulation rate under different working conditions, or calibrating characteristic curves of rotating speed n, fuel injection quantity q and carbon accumulation rate under different working conditions; the characteristic curve is defined as a carbon accumulation rate MAP; the carbon accumulation rate MAP is stored in advance in the engine electronic control unit so as to be searched for invocation.
S41, based on the pressure difference between two ends of the DPF filter and the exhaust gas flow under the current working condition, or based on the rotating speed n and the fuel injection quantity q under the current working condition, finding out the carbon accumulation rate under the current working condition from a corresponding carbon accumulation rate MAP (MAP) chart calibrated in advance, and calculating the carbon loading capacity according to the accumulated integral of the duration time of the working condition.
And S42, determining an environment correction coefficient a according to at least one of the environment pressure, the environment humidity, the air inlet temperature under the current working condition and the cooling liquid temperature.
S43, obtaining an original carbon load model calculation value root _ base according to the calculated carbon load and the determined environment correction coefficient a; at this time, the calculation formula of the original carbon capacity model calculation value root _ base is that the original carbon capacity model calculation value root _ base is carbon capacity × environmental correction coefficient a.
The method for determining the environmental correction coefficient a is directly or indirectly obtained by those skilled in the art without any doubt by using conventional technical means, and will not be described herein.
The embodiment also discloses a carbon load calculation module based on oxygen concentration change for implementing the calculation method. As shown in fig. 6, the carbon loading calculation module includes:
the information acquisition unit is used for acquiring the rotating speed n of the engine, the fuel injection quantity q of the fuel injector and the actual oxygen concentration value ratO2_ act under the current working condition; and the system is also used for acquiring the ambient pressure, the ambient humidity, the pressure difference at two ends of the DPF filter under the current working condition, the air inlet temperature and the cooling liquid temperature.
And the oxygen concentration set value determining unit is used for searching an oxygen concentration set value ratO2_ set under the current working condition from a pre-calibrated oxygen concentration MAP (MAP) based on the rotating speed n and the fuel injection quantity q under the current working condition.
And an oxygen concentration deviation determining unit for obtaining the oxygen concentration deviation ratO2_ diff according to the actual oxygen concentration value ratO2_ act and the oxygen concentration set value ratO2_ set searched by the oxygen concentration set value determining unit.
And the correction unit is used for searching a model correction coefficient fac under the current working condition from a pre-calibrated model correction MAP (MAP) based on the oxygen concentration deviation ratO2_ diff and the fuel injection quantity q under the current working condition.
The original carbon load model calculating unit is based on the pressure difference at two ends of the DPF filter and the engine exhaust gas flow under the current working condition, or based on the rotating speed n and the fuel injection quantity under the current working condition; finding out the carbon accumulation rate under the current working condition from a corresponding carbon accumulation rate MAP chart calibrated in advance, and calculating the carbon loading capacity according to the accumulated integral of the duration time of the working condition; then determining an environment correction coefficient a according to at least one of the environment pressure, the environment humidity, the air inlet temperature and the cooling liquid temperature; and finally, obtaining the original carbon capacity model calculation value root _ base according to the calculated carbon capacity and the determined environment correction coefficient a.
And the corrected carbon capacity model calculation unit obtains a corrected carbon capacity model calculation value root _ final according to the original carbon capacity model calculation value root _ base obtained by the original carbon capacity model calculation unit and the model correction coefficient fac searched by the correction unit.
The information acquisition unit, the oxygen concentration set value determination unit, the oxygen concentration deviation determination unit, the correction unit, the original carbon load model calculation unit and the corrected carbon load model calculation unit can be directly integrated in the engine electric control unit through a writing software module, or can be an independent processing chip integrating the calculation method, and the processing chip and the engine electric control unit can exchange data.
For a specific work project, reference may be made to the contents of the foregoing calculation method, which are not described herein again.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be mutually referred to. For the calculation module disclosed in the second embodiment, since it corresponds to the calculation method disclosed in the second embodiment, the description is simple, and the relevant points can be referred to the method part for explanation.
The methods described in the embodiments disclosed herein may be implemented directly in hardware, as software modules (program modules) executed by an engine electronic control unit, or as a combination of the two. To clearly illustrate this interchangeability of hardware and software, various illustrative components and steps have been described above generally in terms of their functionality, which may be implemented in hardware or software, depending on the particular application and design constraints imposed on the solution.
In conclusion, the phenomenon that the actual fuel injection quantity and air inflow change caused by the related faults of an engine oil way and an engine air way cause combustion change so as to further cause the change of the level of the exhaust soot of the engine (namely the change of the oxygen concentration) is fully considered, and the correction is carried out on the basis of the change of the oxygen concentration on the basis of the calculated value of the original carbon loading model so as to ensure the accuracy of the calculation of the carbon loading; the subsequent correct regeneration is conveniently carried out according to the actual carbon loading amount, the DPF filter is protected from being blocked and damaged, and the normal running of the vehicle is ensured; and the control method is simple and easy to realize.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the design principle of the present invention, and these should also be considered as falling within the protection scope of the present invention.
Claims (10)
1. A carbon loading calculation method based on oxygen concentration change is characterized by comprising the following steps:
s1, based on the rotating speed n of the engine and the fuel injection quantity q of the fuel injector under the current working condition, finding out the oxygen concentration set value under the current working condition from a pre-calibrated oxygen concentration MAP;
s2, measuring an actual oxygen concentration value under the current working condition by the oxygen sensor, and obtaining an oxygen concentration deviation according to the actual oxygen concentration value and the searched set oxygen concentration value;
s3, based on the oxygen concentration deviation and the fuel injection quantity q under the current working condition, finding out a model correction coefficient fac under the current working condition from a pre-calibrated model correction MAP;
and S4, obtaining the corrected carbon load model calculation value according to the original carbon load model calculation value and the searched model correction coefficient fac.
2. The method of claim 1, wherein the modified carbon load model calculation is calculated by the formula:
the corrected carbon load model calculated value is the original carbon load model calculated value + the model correction coefficient fac × the original carbon load model calculated value.
3. The method of calculating carbon load based on oxygen concentration change of claim 1, wherein step S4 includes:
s41, based on the pressure difference between two ends of the DPF filter and the engine exhaust gas flow under the current working condition, or based on the rotating speed n and the fuel injection quantity q under the current working condition; and searching the carbon accumulation rate under the current working condition from a corresponding pre-calibrated carbon accumulation rate MAP, and performing accumulation integral calculation according to the duration of the working condition to obtain the calculated value of the original carbon loading model.
4. The method of calculating carbon load based on oxygen concentration change of claim 1, wherein step S4 includes:
s41, based on the pressure difference at two ends of the DPF filter and the engine exhaust gas flow under the current working condition, or based on the rotating speed n and the fuel injection quantity q under the current working condition, finding out the carbon accumulation rate under the current working condition from a corresponding carbon accumulation rate MAP (MAP) calibrated in advance, and calculating the carbon loading capacity according to the continuous time accumulation integral of the working condition;
s42, determining an environment correction coefficient a according to at least one of the environment pressure, the environment humidity, the air inlet temperature under the current working condition and the coolant temperature;
and S43, obtaining the original carbon load model calculation value according to the calculated carbon load and the determined environment correction coefficient a.
5. The method of calculating carbon load based on oxygen concentration change according to claim 3 or 4, wherein the step S4 further comprises:
s40, performing an engine bench test based on different simulated working conditions, and calibrating characteristic curves of pressure difference at two ends of a DPF filter, engine exhaust gas flow and carbon accumulation rate under different working conditions, or calibrating characteristic curves of rotating speed n, fuel injection quantity q and carbon accumulation rate under different working conditions; the characteristic curve is defined as the carbon accumulation rate MAP; the carbon accumulation rate MAP is stored in advance in an engine electronic control unit.
6. The method of calculating carbon load based on oxygen concentration change of claim 1, wherein step S1 includes:
carrying out engine bench tests based on different simulated working conditions, and calibrating characteristic curves of the rotating speed n, the fuel injection quantity q and the oxygen concentration under different working conditions, wherein the characteristic curves are defined as an oxygen concentration MAP; the oxygen concentration MAP is stored in advance in an engine electronic control unit.
7. The method of calculating carbon load based on oxygen concentration change of claim 1, wherein step S3 includes:
carrying out engine pedestal test based on different simulated working conditions, calibrating characteristic curves of fuel injection quantity q, oxygen concentration deviation and model correction coefficient fac under different working conditions, and defining the characteristic curves as the model correction MAP; and storing the model correction MAP in an engine electronic control unit in advance.
8. A carbon load calculation module based on oxygen concentration variation, the carbon load calculation module comprising:
the information acquisition unit is used for acquiring the rotating speed n of the engine, the fuel injection quantity q of the fuel injector and the actual value of the oxygen concentration under the current working condition;
the oxygen concentration set value determining unit is used for searching an oxygen concentration set value under the current working condition from a pre-calibrated oxygen concentration MAP (MAP) based on the rotating speed n and the fuel injection quantity q under the current working condition;
the oxygen concentration deviation determining unit is used for obtaining oxygen concentration deviation according to the oxygen concentration actual value and the searched oxygen concentration set value;
the correction unit is used for searching a model correction coefficient fac under the current working condition from a pre-calibrated model correction MAP (MAP) based on the oxygen concentration deviation and the fuel injection quantity q under the current working condition;
and the corrected carbon load model calculation unit is used for obtaining a corrected carbon load model calculation value according to the original carbon load model calculation value and the searched model correction coefficient fac.
9. The carbon load calculation module based on oxygen concentration variation of claim 8,
the information acquisition unit is further used for acquiring the ambient pressure, the ambient humidity, the pressure difference at two ends of the DPF filter under the current working condition, the air inlet temperature and the cooling liquid temperature.
10. The carbon load calculation module based on changes in oxygen concentration of claim 9, further comprising:
the original carbon load model calculation unit is based on the pressure difference at two ends of the DPF filter and the engine exhaust gas flow under the current working condition, or based on the rotating speed n and the fuel injection quantity q under the current working condition; finding out the carbon accumulation rate under the current working condition from a corresponding carbon accumulation rate MAP chart calibrated in advance, and calculating the carbon loading capacity according to the accumulated integral of the duration time of the working condition; then, determining an environment correction coefficient a according to at least one selected from the environment pressure, the environment humidity, the air inlet temperature and the cooling liquid temperature; and finally, obtaining an original carbon load model calculation value according to the calculated carbon load and the determined environmental correction coefficient a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910906122.XA CN110671176B (en) | 2019-09-24 | 2019-09-24 | Carbon capacity calculation method and calculation module based on oxygen concentration change |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910906122.XA CN110671176B (en) | 2019-09-24 | 2019-09-24 | Carbon capacity calculation method and calculation module based on oxygen concentration change |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110671176A CN110671176A (en) | 2020-01-10 |
| CN110671176B true CN110671176B (en) | 2020-10-30 |
Family
ID=69077417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910906122.XA Active CN110671176B (en) | 2019-09-24 | 2019-09-24 | Carbon capacity calculation method and calculation module based on oxygen concentration change |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110671176B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111734516B (en) * | 2020-07-07 | 2021-06-22 | 潍柴动力股份有限公司 | Engine emission data correction method and device and ECU |
| CN112343693B (en) * | 2020-09-21 | 2022-03-29 | 东风汽车集团有限公司 | GPF carbon capacity partition estimation method |
| CN112507541B (en) * | 2020-11-30 | 2023-03-21 | 潍柴动力股份有限公司 | Differential pressure carbon loading capacity calculation method and related equipment |
| CN112395710B (en) * | 2020-12-02 | 2023-11-17 | 潍柴动力股份有限公司 | Correction method and device for carbon loading model |
| CN112528491B (en) * | 2020-12-08 | 2022-11-29 | 潍柴动力股份有限公司 | Method and device for calculating engine SOF original emission, storage medium and electronic equipment |
| CN112648057B (en) * | 2020-12-22 | 2022-04-05 | 潍柴动力股份有限公司 | Carbon load detection method of particulate matter catcher, related equipment and storage medium |
| CN113074035B (en) * | 2021-05-07 | 2022-07-19 | 潍柴动力股份有限公司 | DPF carbon loading capacity estimation method, device and system |
| CN114320547B (en) * | 2021-12-28 | 2023-06-20 | 联合汽车电子有限公司 | Regeneration method, device, equipment, system and storage medium of particle trap |
| CN115405404A (en) * | 2022-09-29 | 2022-11-29 | 潍柴动力股份有限公司 | Construction method and device of Soot original emission model and engine aftertreatment system |
| CN115638042B (en) * | 2022-12-23 | 2023-04-18 | 潍柴动力股份有限公司 | Carbon loading model correction method and device, storage medium and electronic equipment |
| CN116122944B (en) * | 2023-04-19 | 2023-07-18 | 潍柴动力股份有限公司 | Engine aftertreatment method and system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2275652A4 (en) * | 2008-05-16 | 2015-12-16 | Toyota Motor Co Ltd | Soot discharge estimating device for internal combustion engines |
| CN106481419B (en) * | 2016-11-08 | 2018-12-07 | 清华大学苏州汽车研究院（吴江） | A kind of carbon deposition quantity calculation method of diesel engine particle catcher |
| CN107605583B (en) * | 2017-09-21 | 2019-09-17 | 北京汽车研究总院有限公司 | Diesel vehicle grain catcher tires out carbon amounts evaluation method |
| CN108087071B (en) * | 2017-12-05 | 2021-09-28 | 南京依柯卡特排放技术股份有限公司 | Method for judging carbon loading of DPF |
| CN107916972A (en) * | 2017-12-20 | 2018-04-17 | 广州汽车集团股份有限公司 | Engine particle trap initiative regeneration householder method, device, storage medium and system |
| CN108150260B (en) * | 2017-12-25 | 2021-01-08 | 无锡威孚力达催化净化器有限责任公司 | Method and system for calculating carbon loading of diesel engine DPF |
-
2019
- 2019-09-24 CN CN201910906122.XA patent/CN110671176B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110671176A (en) | 2020-01-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110671176B (en) | Carbon capacity calculation method and calculation module based on oxygen concentration change | |
| CN109184872B (en) | Method for judging regeneration opportunity of diesel engine DPF based on carbon loading capacity | |
| CN108150300B (en) | Method and device for correcting NOx original emission model value of diesel engine | |
| CN112395710B (en) | Correction method and device for carbon loading model | |
| CN111042956B (en) | EGR flow fault judgment method, device and equipment | |
| CN106014571A (en) | Method for calculating original engine NOx values of engines | |
| CN110219759B (en) | Static leakage measuring method, device and system of oil sprayer | |
| CN112557040B (en) | Method for estimating transient soot emission of engine | |
| CN115638042B (en) | Carbon loading model correction method and device, storage medium and electronic equipment | |
| JP4449650B2 (en) | Diesel engine exhaust aftertreatment system | |
| JP2008516141A (en) | Improved exhaust gas temperature estimation method and apparatus, and internal combustion engine equipped with exhaust gas temperature estimation apparatus | |
| CN116220870A (en) | Control method and device for vehicle exhaust emission, electronic equipment and storage medium | |
| CN116447028A (en) | Control method and device for EGR rate of engine system, electronic equipment and storage medium | |
| CN114562375B (en) | Supercharger diagnosis method and device | |
| JP2002544423A (en) | Method and apparatus for controlling an internal combustion engine with an exhaust gas aftertreatment system | |
| CN113250838B (en) | Injection valve fault diagnosis method, system, equipment and storage medium | |
| CN116066266A (en) | Exhaust gas recirculation system fault detection method and device, storage medium and vehicle | |
| CN110594068B (en) | Method, device and equipment for detecting fuel injection quantity and storage medium | |
| CN114542250A (en) | Temperature detection method, device and equipment for gasoline particle catcher and storage medium | |
| CN114352395A (en) | Method, device and equipment for estimating exhaust temperature of natural gas engine | |
| CN109236467B (en) | Method and device for detecting power shortage of engine | |
| CN111535929A (en) | Method for calculating DPF regeneration compensation value based on fuel consumption | |
| CN112682190A (en) | Method, device and equipment for controlling opening of EGR valve | |
| JP2010275891A (en) | Exhaust emission control device for internal combustion engine | |
| CN114934851B (en) | Method, device, equipment and storage medium for correcting volume of intercooling pipeline |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | 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 |