CN116104620A - Method and device for determining carbon loading and engine - Google Patents
Method and device for determining carbon loading and engine Download PDFInfo
- Publication number
- CN116104620A CN116104620A CN202310305143.2A CN202310305143A CN116104620A CN 116104620 A CN116104620 A CN 116104620A CN 202310305143 A CN202310305143 A CN 202310305143A CN 116104620 A CN116104620 A CN 116104620A
- Authority
- CN
- China
- Prior art keywords
- carbon loading
- carbon
- pressure drop
- reaction stage
- reaction
- 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.)
- Pending
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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1611—Particle filter ash amount
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The embodiment of the invention discloses a method, a device and an engine for determining carbon loading, which are used for judging whether pressure drop mutation caused by cracks exists or not by comparing the pressure drop change rate with the critical pressure drop change rate, and respectively calculating the carbon loading by utilizing the difference of reaction rates before and after the pressure drop mutation when the pressure drop mutation exists, so that the technical problem of larger calculation error of the carbon loading caused by local pressure drop mutation due to the occurrence of cracks of a carbon cake layer in a catalytic diesel particle filter in the prior art is solved, and the technical effect of improving the calculation precision of the carbon loading is realized.
Description
Technical Field
The embodiment of the invention relates to the technical field of engines, in particular to a method and a device for determining carbon loading and an engine.
Background
The DPF (Diesel Particulate Filter ) has become an integral part of diesel filtering PM (Particulate Matter ) and statistical PN (particulate Number). Some filters are coated with catalytic materials such as Pt (platinum) and Pd (palladium gold), i.e. CDPF (Catalyzed Diesel Particulate Filter, catalytic diesel particulate filter). The DPF reduces particulate emissions by trapping soot particles in the exhaust gas, and PM is deposited inside the DPF over a prolonged trapping time, so that PM collected in the DPF must be periodically purged to avoid increasing the DPF pressure drop and reducing the economy of the engine.
There are two types of regeneration methods for removing PM in a DPF that are currently in common use: passive regeneration and active regeneration; active regeneration occurs by raising the DPF temperature to about 600 ℃ through thermal management such as fuel injection after vortex, and C+O occurs 2 →CO 2 PM removal by oxidation reaction; whereas passive regeneration uses the temperature of the exhaust gas (above 250 ℃) and NO 2 To oxidize PM, i.e. C+2NO 2 →CO 2 +2NO，NO 2 Mainly from the conversion of NO by a DOC (Diesel Oxidation Catalyst) upstream of the DPF, the principle of a regeneration mode shows that passive regeneration is taken as a sustainable regeneration mode, has the advantages of reducing the increase of oil consumption caused by post-injection fuel, reducing the risk of burning the DPF when the DPF is actively regenerated and improving the reliability of a post-treatment system, and has been receiving more and more attention in recent years.
The carbon loading is typically calculated based on CDPF differential pressure and CDPF exhaust volumetric flow, and during passive regeneration, the carbon cake layer in the CDPF carrier is neutralized by the exhaust to avoid NO generated by the catalyst 2 Oxidation gradually decreases as regeneration time increases until the desired carbon loading interval exits passive regeneration. However, during the regeneration process, cracks or wall effective through holes are formed in the carbon cake layer, and the occurrence of cracks causes a rapid local pressure drop reduction, and in practice, the carbon loading is not reduced rapidly during the rapid pressure drop change, which results in inaccurate calculation of the carbon loading based on the CDPF differential pressure.
Disclosure of Invention
The embodiment of the invention provides a method, a device and an engine for determining carbon loading, which solve the technical problem of larger calculation error of the carbon loading caused by local pressure drop mutation due to cracks of a carbon cake layer in a catalytic diesel particulate filter in the prior art.
The embodiment of the invention provides a method for determining carbon loading, which comprises the following steps of:
if the initial differential pressure carbon loading is larger than the critical carbon loading threshold, comparing the detected differential pressure change rate within a preset time period with the critical differential pressure change rate, and judging whether a first condition occurs, wherein the first condition refers to the condition that the pressure drop has mutation;
if not, calculating the current differential pressure carbon loading as the current carbon loading;
if so, calculating the carbon loads of a first reaction stage and a second reaction stage within the preset time period respectively, and adding the carbon loads as the current carbon load, wherein the reaction rate of the first reaction stage is smaller than that of the second reaction stage, and the reaction rate of the second reaction stage is that after pressure drop mutation occurs.
Further, calculating the carbon loading of the second reaction stage includes:
respectively calculating the carbon loading under a first pressure drop reaction rate and the carbon loading under a second pressure drop reaction rate in the second reaction stage, wherein the first pressure drop reaction rate is the reaction rate of the first reaction stage, and the second pressure drop reaction rate is the reaction rate of the second reaction stage;
and adding the carbon loading at the first pressure drop reaction rate and the carbon loading at the second pressure drop reaction rate to obtain an average value, and obtaining the carbon loading of the second reaction stage.
Further, calculating the carbon loading at the first pressure drop reaction rate in the second reaction stage comprises:
calculating the carbon loading at the first pressure drop reaction rate in the second reaction stage by using a formula c1=m- (M0-M1) × (t-t 1)/t 1, wherein C1 is the carbon loading at the first pressure drop reaction rate in the second reaction stage, M is the differential pressure carbon loading in the preset duration, M0 is the initial differential pressure carbon loading, M1 is the differential pressure carbon loading in the first reaction stage in the preset duration, t is the preset duration, t1 is the duration of the first reaction stage, and t-t1 is the duration of the second reaction stage.
Further, calculating the carbon loading at the second pressure drop reaction rate in the second reaction stage includes:
the carbon loading at the second pressure drop reaction rate in the second reaction stage is calculated using the formula c2=m-M1, wherein C1 is the carbon loading at the second pressure drop reaction rate in the second reaction stage.
Further, before comparing the pressure difference change rate detected in the preset time period with the critical pressure difference change rate, judging whether the first condition occurs, the method further includes:
acquiring the initial differential pressure carbon loading;
comparing the initial differential pressure carbon loading with the critical carbon loading threshold, and judging whether a second condition occurs, wherein the second condition refers to the condition that a carbon cake layer in the catalytic diesel particulate filter is cracked;
if not, calculating the current differential pressure carbon loading as the current carbon loading;
if yes, further executing the step of judging whether the first condition occurs.
Further, the catalytic diesel particulate filter is in the passive regeneration state if one of the following conditions is met:
the carbon loading of the catalytic diesel particulate filter is greater than a preset passive regeneration carbon loading limit;
the temperature of the catalytic diesel particulate filter reaches a preset passive regeneration temperature threshold.
Further, the critical carbon loading threshold is determined based on a passive regeneration pressure differential curve.
The embodiment of the invention also provides a device for determining the carbon loading, which comprises:
the first judging unit is used for comparing the pressure difference change rate detected in the preset time period with the critical pressure difference change rate if the initial pressure difference carbon load is larger than the critical carbon load threshold value, and judging whether a first condition occurs, wherein the first condition refers to the condition that the pressure drop is suddenly changed;
the first calculation unit is used for calculating the current differential pressure carbon loading as the current carbon loading if the judgment result of the first judgment unit is negative;
and the second calculation unit is used for calculating the carbon loads of the first reaction stage and the second reaction stage in the preset duration respectively and adding the carbon loads as the current carbon load if the judgment result of the first judgment unit is yes, wherein the reaction rate of the first reaction stage is smaller than that of the second reaction stage, and the reaction rate of the second reaction stage is that after the pressure drop mutation occurs.
Further, the second calculation unit includes:
a carbon loading calculating subunit, configured to calculate, in the second reaction stage, a carbon loading at a first pressure drop reaction rate and a carbon loading at a second pressure drop reaction rate, where the first pressure drop reaction rate is a reaction rate of the first reaction stage, and the second pressure drop reaction rate is a reaction rate of the second reaction stage;
and the average value calculation subunit is used for adding the carbon loading at the first pressure drop reaction rate and the carbon loading at the second pressure drop reaction rate to obtain an average value, and obtaining the carbon loading of the second reaction stage.
The embodiment of the invention also provides an engine, which executes the method for determining the carbon loading in any embodiment.
The embodiment of the invention discloses a method, a device and an engine for determining carbon loading, wherein the method comprises the following steps: when the catalytic diesel particulate filter is in a passive regeneration state, if the initial differential pressure carbon loading is larger than a critical carbon loading threshold, comparing the detected differential pressure change rate within a preset time period with the critical differential pressure change rate, and judging whether a first condition exists or not; if not, calculating the current differential pressure carbon loading as the current carbon loading; if yes, the carbon loading of the first reaction stage and the second reaction stage in the preset time period are calculated respectively, and the carbon loading is added to be used as the current carbon loading. According to the method and the device, the pressure difference change rate is compared with the critical pressure difference change rate, whether the pressure drop mutation caused by the crack exists is judged, and the carbon load is calculated by utilizing the difference of reaction rates before and after the pressure drop mutation when the pressure drop mutation exists, so that the technical problem that the calculation error of the carbon load caused by the local pressure drop mutation is large due to the crack of the carbon cake layer in the catalytic diesel particulate filter in the prior art is solved, and the technical effect of improving the calculation precision of the carbon load is realized.
Drawings
FIG. 1 is a flow chart of a method for determining carbon loading provided by an embodiment of the present invention;
FIG. 2 is a plot of differential pressure changes during passive regeneration of a catalyzed diesel particulate filter provided by an embodiment of the present invention;
fig. 3 is a block diagram of a carbon loading determining apparatus according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and in the drawings are used for distinguishing between different objects and not for limiting a particular order. The following embodiments of the present invention may be implemented individually or in combination with each other, and the embodiments of the present invention are not limited thereto.
Fig. 1 is a flowchart of a method for determining a carbon loading according to an embodiment of the present invention.
As shown in fig. 1, the method for determining the carbon loading specifically includes the following steps when the catalytic diesel particulate filter is in a passive regeneration state:
s101, if the initial differential pressure carbon loading is larger than a critical carbon loading threshold, comparing the detected differential pressure change rate within a preset time period with the critical differential pressure change rate, and judging whether a first condition occurs, wherein the first condition refers to the condition that the pressure drop is suddenly changed.
Alternatively, the catalytic diesel particulate filter is in a passive regeneration state if it meets one of the following conditions: the carbon loading of the catalytic diesel particulate filter is greater than a preset passive regeneration carbon loading limit; the temperature of the catalyzed diesel particulate filter reaches a preset passive regeneration temperature threshold.
Specifically, when the carbon loading of the catalyzed diesel particulate filter exceeds a preset passive regeneration carbon loading limit M lim Or when the temperature of the catalytic diesel particulate filter reaches a preset passive regeneration temperature threshold, the catalytic diesel particulate filter triggers passive regeneration, and the initial differential pressure carbon load M0 of the current passive regeneration is recorded. Because the pressure difference change rate is changed due to the occurrence of cracks in the carbon cake layer in the passive regeneration process, namely, the pressure drop mutation occurs, when the carbon loading is smaller, the change of the pressure difference change rate is not obvious, so that the initial pressure difference carbon loading is required to be compared with a critical carbon loading threshold value, and whether the initial pressure difference carbon loading M0 is larger than the critical carbon loading threshold value Mp of the influence of the cracks on the pressure difference is judged.
Optionally, in S101, comparing the pressure difference change rate detected in the preset time period with the critical pressure difference change rate, and before judging whether the first condition occurs, the method for determining the carbon load further includes: acquiring an initial differential pressure carbon loading; comparing the initial differential pressure carbon loading with a critical carbon loading threshold value, and judging whether a second condition occurs, wherein the second condition refers to the condition that a carbon cake layer in the catalytic diesel particulate filter is cracked; if not, calculating the current differential pressure carbon loading as the current carbon loading; if yes, step S101 is further executed to determine whether the first condition occurs.
Optionally, the critical carbon loading threshold is determined based on a passive regeneration pressure differential curve.
Specifically, when the catalytic diesel particulate filter meets the triggering condition to trigger the passive regeneration, the differential pressure carbon loading at this time is the initial differential pressure carbon loading M0, fig. 2 is a differential pressure variation discount chart of the catalytic diesel particulate filter during the passive regeneration according to the embodiment of the present invention, and as shown in fig. 2, the differential pressure variation of the catalytic diesel particulate filter is divided into three stages, namely 1 st stage、2 st stage and 3 st stage, see, at 1 st stage and 2 st The junction of the stage has a sudden pressure difference, namely the sharply reduced inflection point, namely the position marked by (2) in fig. 2, and the carbon loading is the critical carbon loading threshold Mp.
Comparing the initial differential pressure carbon loading M0 with a critical carbon loading threshold Mp, if M0 is smaller than Mp, indicating that the carbon loading is less and insufficient to generate crack errors, namely, a second condition cannot occur, if M0 is larger than Mp, indicating that the crack errors are possible, namely, a second condition can occur, determining a critical differential pressure change rate delta Pi under different carbon loading in a range between the critical carbon loading threshold Mp and the initial differential pressure carbon loading M0 according to the exhaust flow of the catalytic diesel particulate filter and the temperature of the catalytic diesel particulate filter, comparing the differential pressure change rate delta P detected in a preset time period with the critical differential pressure change rate delta Pi, and judging whether the first condition occurs. Wherein i is a preset passive regeneration carbon loading limit M lim And the interval equal fraction of the critical carbon loading threshold Mp, the phase greater than Δpi is the fast pressure drop regeneration phase, the phase less than Δpi is the slow pressure drop regeneration phase, here, "fast pressure drop" and "slow pressure drop" refer to the relative values, i.e., the phase greater than Δpi has a pressure drop change rate greater than the phase less than Δpi.
S102, if not, calculating the current differential pressure carbon loading as the current carbon loading.
Specifically, when Δp < Δpi, the carbon loading is less and there is no first condition occurring, i.e., when the carbon cake layer is insufficient to produce cracks resulting in a calculation error of the carbon loading, the carbon loading during this time is still equal to the current differential pressure carbon loading.
And S103, if so, respectively calculating the carbon loads of the first reaction stage and the second reaction stage within a preset time period, and adding the carbon loads as the current carbon load, wherein the reaction rate of the first reaction stage is smaller than that of the second reaction stage, and the reaction rate of the second reaction stage is that after the pressure drop mutation occurs.
Specifically, when Δp > - Δpi, there is a first condition that the passive regeneration reaction at this time is in a fast pressure drop reaction stage with a crack, and in this reaction stage, a first reaction stage and a second reaction stage are included, where the first reaction stage is a slow reaction stage with a smaller reaction rate, and the second reaction stage is a fast reaction stage with a faster reaction rate, and here the slow reaction stage and the fast reaction stage are also opposite, i.e. the reaction rate of the fast reaction stage is greater than that of the slow reaction stage. Because the reaction rates of the two stages are different, the current differential pressure carbon loading cannot be simply used as the current carbon loading, and therefore, the carbon loading of the first reaction stage and the carbon loading of the second reaction stage need to be respectively settled, and then added to be used as the current carbon loading, so that the accurate calculation of the carbon loading is realized.
According to the method and the device, the pressure difference change rate is compared with the critical pressure difference change rate, whether the pressure drop mutation caused by the crack exists is judged, and the carbon load is calculated by utilizing the difference of reaction rates before and after the pressure drop mutation when the pressure drop mutation exists, so that the technical problem that the calculation error of the carbon load caused by the local pressure drop mutation is large due to the crack of the carbon cake layer in the catalytic diesel particulate filter in the prior art is solved, and the technical effect of improving the calculation precision of the carbon load is realized.
Optionally, S103, calculating the carbon loading of the second reaction stage includes:
respectively calculating the carbon loading under the first pressure drop reaction rate and the carbon loading under the second pressure drop reaction rate in the second reaction stage, wherein the first pressure drop reaction rate is the reaction rate of the first reaction stage, and the second pressure drop reaction rate is the reaction rate of the second reaction stage;
and adding the carbon loading at the first pressure drop reaction rate and the carbon loading at the second pressure drop reaction rate to obtain an average value, and obtaining the carbon loading of the second reaction stage.
Specifically, Δp is the pressure difference change rate measured within a preset time t, if Δp > Δpi is in a fast pressure drop reaction stage with a crack during the preset time t, the whole reaction process includes a slow reaction stage t1 (i.e. the first reaction stage) and a fast reaction stage t-t1 (i.e. the second reaction stage), and in the second reaction stage t-t1, the carbon loading at the reaction rate based on the slow pressure drop reaction (i.e. the carbon loading at the first pressure drop reaction rate) and the carbon loading at the reaction rate based on the fast pressure drop reaction (i.e. the carbon loading at the second pressure drop reaction rate) are calculated respectively, and then added and divided by 2 to obtain the average value of the two as the carbon loading in the second reaction stage.
Optionally, calculating the carbon loading at the first pressure drop reaction rate in the second reaction stage comprises:
calculating the carbon loading at the first pressure drop reaction rate in the second reaction stage by using a formula of c1=m- (M0-M1) × (t-t 1)/t 1, wherein C1 is the carbon loading at the first pressure drop reaction rate in the second reaction stage, M is the differential pressure carbon loading in a preset duration, M0 is the initial differential pressure carbon loading, M1 is the differential pressure carbon loading in the first reaction stage in the preset duration, t is the preset duration, t1 is the duration of the first reaction stage, and t-t1 is the duration of the second reaction stage.
Optionally, calculating the carbon loading at the second pressure drop reaction rate in the second reaction stage comprises:
the carbon loading at the second pressure drop reaction rate in the second reaction stage is calculated using the formula c2=m-M1, where C1 is the carbon loading at the second pressure drop reaction rate in the second reaction stage.
Specifically, the differential pressure carbon loading in the preset duration t is M, and the differential pressure carbon loading in the first reaction stage t1 in the preset duration t is M1, so that the differential pressure carbon loading in the preset duration t=the differential pressure carbon loading in the first reaction stage t1 is m1+the carbon loading M2 in the second reaction stage t-t 1.
Wherein the carbon loading m2=1/2× (carbon loading c1 at the first pressure drop reaction rate+carbon loading C2 at the second pressure drop reaction rate) within the second reaction stage t-t 1;
carbon loading at the first pressure drop reaction rate c1=m- (M0-M1) × (t-t 1)/t 1;
carbon loading at the second pressure drop reaction rate c2=m-M1;
the carbon loading=m+m0/2+ (M1-M0) ×t/(2×t1) for the final preset time period t
In the embodiment of the invention, the carbon load correction amount which is quickly regenerated after the occurrence of the crack is effectively corrected by distinguishing the change of the carbon load before and after the occurrence of the crack of the carbon cake layer, so that a more accurate calculated value of the passive regenerated carbon load of the catalytic diesel particulate filter is obtained.
Fig. 3 is a block diagram of a carbon loading determining apparatus according to an embodiment of the present invention. When the catalytic particulate filter is in a passive regeneration state, as shown in fig. 3, the carbon loading determining device specifically includes:
the first judging unit 31 is configured to compare the pressure difference change rate detected in the preset time period with the critical pressure difference change rate if the initial pressure difference carbon load is greater than the critical carbon load threshold, and judge whether a first condition occurs, where the first condition refers to a situation that a pressure drop has an abrupt change;
a first calculating unit 32, configured to calculate the current differential pressure carbon loading as the current carbon loading if the determination result of the first determining unit is no;
and a second calculating unit 33, configured to calculate, if the determination result of the first determining unit is yes, the carbon loadings of the first reaction stage and the second reaction stage within the preset duration, respectively, and add the carbon loadings as the current carbon loading, where the reaction rate of the first reaction stage is smaller than the reaction rate of the second reaction stage, and the reaction rate of the second reaction stage is the reaction rate after the pressure drop mutation occurs.
Optionally, the second computing unit 33 specifically includes:
a carbon loading calculating subunit, configured to calculate, in the second reaction stage, a carbon loading at a first pressure drop reaction rate and a carbon loading at a second pressure drop reaction rate, where the first pressure drop reaction rate is a reaction rate of the first reaction stage, and the second pressure drop reaction rate is a reaction rate of the second reaction stage;
and the average value calculation subunit is used for adding the carbon loading at the first pressure drop reaction rate and the carbon loading at the second pressure drop reaction rate to obtain an average value, and obtaining the carbon loading of the second reaction stage.
Optionally, the carbon loading calculation subunit is specifically configured to:
calculating the carbon loading at the first pressure drop reaction rate in the second reaction stage by using a formula of c1=m- (M0-M1) × (t-t 1)/t 1, wherein C1 is the carbon loading at the first pressure drop reaction rate in the second reaction stage, M is the differential pressure carbon loading in a preset duration, M0 is the initial differential pressure carbon loading, M1 is the differential pressure carbon loading in the first reaction stage in the preset duration, t is the preset duration, t1 is the duration of the first reaction stage, and t-t1 is the duration of the second reaction stage.
Optionally, the carbon loading calculation subunit is specifically further configured to:
the carbon loading at the second pressure drop reaction rate in the second reaction stage is calculated using the formula c2=m-M1, where C1 is the carbon loading at the second pressure drop reaction rate in the second reaction stage.
Optionally, before the first judging unit 31 compares the pressure difference change rate detected in the preset time period with the critical pressure difference change rate, the apparatus further includes:
the data acquisition unit is used for acquiring initial differential pressure carbon loading;
the second judging unit is used for comparing the initial differential pressure carbon loading with a critical carbon loading threshold value and judging whether a second condition occurs, wherein the second condition refers to the condition that a carbon cake layer in the catalytic diesel particulate filter is cracked;
if the judging result of the second judging unit is negative, the first calculating unit is also used for calculating the current differential pressure carbon loading as the current carbon loading;
if the second judging unit judges yes, the first judging unit 31 performs the step of judging whether or not the first situation occurs.
The carbon loading determining device provided by the embodiment of the invention can execute the carbon loading determining method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the executing method.
The embodiment of the invention also provides an engine, which executes the method for determining the carbon loading in any embodiment.
The engine provided by the embodiment of the present invention uses the method for determining the carbon loading in the above embodiment, so the engine provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, and will not be described here again
In the description of embodiments of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Finally, it should be noted that the foregoing description is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A method of determining carbon loading, wherein when a catalytic diesel particulate filter is in a passive regeneration state, the method comprises:
if the initial differential pressure carbon loading is larger than the critical carbon loading threshold, comparing the detected differential pressure change rate within a preset time period with the critical differential pressure change rate, and judging whether a first condition occurs, wherein the first condition refers to the condition that the pressure drop has mutation;
if not, calculating the current differential pressure carbon loading as the current carbon loading;
if so, calculating the carbon loads of a first reaction stage and a second reaction stage within the preset time period respectively, and adding the carbon loads as the current carbon load, wherein the reaction rate of the first reaction stage is smaller than that of the second reaction stage, and the reaction rate of the second reaction stage is that after pressure drop mutation occurs.
2. The method of determining carbon loading of claim 1, wherein calculating the carbon loading of the second reaction stage comprises:
respectively calculating the carbon loading under a first pressure drop reaction rate and the carbon loading under a second pressure drop reaction rate in the second reaction stage, wherein the first pressure drop reaction rate is the reaction rate of the first reaction stage, and the second pressure drop reaction rate is the reaction rate of the second reaction stage;
and adding the carbon loading at the first pressure drop reaction rate and the carbon loading at the second pressure drop reaction rate to obtain an average value, and obtaining the carbon loading of the second reaction stage.
3. The method of determining carbon loading of claim 2, wherein calculating the carbon loading at the first pressure drop reaction rate during the second reaction stage comprises:
calculating the carbon loading at the first pressure drop reaction rate in the second reaction stage by using a formula c1=m- (M0-M1) × (t-t 1)/t 1, wherein C1 is the carbon loading at the first pressure drop reaction rate in the second reaction stage, M is the differential pressure carbon loading in the preset duration, M0 is the initial differential pressure carbon loading, M1 is the differential pressure carbon loading in the first reaction stage in the preset duration, t is the preset duration, t1 is the duration of the first reaction stage, and t-t1 is the duration of the second reaction stage.
4. A method of determining carbon loading according to claim 3 wherein calculating the carbon loading at a second pressure drop reaction rate during the second reaction stage comprises:
the carbon loading at the second pressure drop reaction rate in the second reaction stage is calculated using the formula c2=m-M1, wherein C1 is the carbon loading at the second pressure drop reaction rate in the second reaction stage.
5. The method of determining carbon loading of claim 1, wherein before comparing the rate of change of differential pressure detected over the predetermined period of time with the rate of change of critical differential pressure to determine whether the first condition has occurred, the method further comprises:
acquiring the initial differential pressure carbon loading;
comparing the initial differential pressure carbon loading with the critical carbon loading threshold, and judging whether a second condition occurs, wherein the second condition refers to the condition that a carbon cake layer in the catalytic diesel particulate filter is cracked;
if not, calculating the current differential pressure carbon loading as the current carbon loading;
if yes, further executing the step of judging whether the first condition occurs.
6. The method of determining carbon loading of claim 1, wherein the catalytic diesel particulate filter is in the passive regeneration state if one of the following conditions is met:
the carbon loading of the catalytic diesel particulate filter is greater than a preset passive regeneration carbon loading limit;
the temperature of the catalytic diesel particulate filter reaches a preset passive regeneration temperature threshold.
7. The method of claim 1, wherein the critical carbon loading threshold is determined based on a passive regeneration pressure differential curve.
8. A device for determining carbon loading, wherein the device comprises, when a catalytic diesel particulate filter is in a passive regeneration state:
the first judging unit is used for comparing the pressure difference change rate detected in the preset time period with the critical pressure difference change rate if the initial pressure difference carbon load is larger than the critical carbon load threshold value, and judging whether a first condition occurs, wherein the first condition refers to the condition that the pressure drop is suddenly changed;
the first calculation unit is used for calculating the current differential pressure carbon loading as the current carbon loading if the judgment result of the first judgment unit is negative;
and the second calculation unit is used for calculating the carbon loads of the first reaction stage and the second reaction stage in the preset duration respectively and adding the carbon loads as the current carbon load if the judgment result of the first judgment unit is yes, wherein the reaction rate of the first reaction stage is smaller than that of the second reaction stage, and the reaction rate of the second reaction stage is that after the pressure drop mutation occurs.
9. The carbon loading determination device of claim 8, wherein the second computing unit comprises:
a carbon loading calculating subunit, configured to calculate, in the second reaction stage, a carbon loading at a first pressure drop reaction rate and a carbon loading at a second pressure drop reaction rate, where the first pressure drop reaction rate is a reaction rate of the first reaction stage, and the second pressure drop reaction rate is a reaction rate of the second reaction stage;
and the average value calculation subunit is used for adding the carbon loading at the first pressure drop reaction rate and the carbon loading at the second pressure drop reaction rate to obtain an average value, and obtaining the carbon loading of the second reaction stage.
10. An engine, characterized in that the engine performs the method of determining the carbon loading as claimed in any one of the preceding claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310305143.2A CN116104620A (en) | 2023-03-23 | 2023-03-23 | Method and device for determining carbon loading and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310305143.2A CN116104620A (en) | 2023-03-23 | 2023-03-23 | Method and device for determining carbon loading and engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116104620A true CN116104620A (en) | 2023-05-12 |
Family
ID=86261798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310305143.2A Pending CN116104620A (en) | 2023-03-23 | 2023-03-23 | Method and device for determining carbon loading and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116104620A (en) |
-
2023
- 2023-03-23 CN CN202310305143.2A patent/CN116104620A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109356698B (en) | DPF self-adaptive active regeneration control method, device and system | |
| EP2864601B1 (en) | Method for detecting abnormally frequent diesel particulate filter regeneration, engine and exhaust after treatment system, and warning system and method | |
| US7484357B2 (en) | Apparatus, system, and method for determining and implementing estimate reliability | |
| CN102365432B (en) | System and method for filtering diesel engine exhaust particulates | |
| US9695732B2 (en) | Diagnostic device | |
| CN108278146B (en) | Particulate filter control system for internal combustion engine | |
| CN114087058B (en) | Method and system for detecting DPF overload | |
| CN104373179A (en) | A vehicle and a method of determining a reductant storage capacity set point | |
| CN106837496B (en) | Engine particulate purifying regeneration control system | |
| CN104234799A (en) | Method and system for adapting the clean filter correction map for a selective catalyst reduction filter | |
| CN104929743A (en) | System to monitor regeneration frequency of particulate filter | |
| US20130298529A1 (en) | System amd method for controlling an after-treatment component of a compression-ignition engine | |
| CN110295985B (en) | Method and device for detecting removal of diesel oxidation catalyst | |
| US9046026B2 (en) | Particulate oxidation catalyst with dual pressure-drop sensors | |
| CN111749769B (en) | DPF active regeneration efficiency detection method | |
| CN112983613B (en) | Nitrogen-oxygen sensor fault judgment method and related device | |
| CN111894713B (en) | Method and device for determining crystallization fault of selective catalytic reduction device | |
| CN116104620A (en) | Method and device for determining carbon loading and engine | |
| CN114441095B (en) | Detection method and device of sensor | |
| JP5516267B2 (en) | Engine exhaust purification system | |
| JP5227149B2 (en) | Engine exhaust purification system | |
| CN114961951B (en) | Active monitoring method, device and system for DOC sulfur poisoning | |
| WO2023060654A1 (en) | Control method, control apparatus and control system for removal of pm in dpf | |
| JP4081419B2 (en) | Exhaust purification device | |
| CN114909205B (en) | DPF carbon loading monitoring method and device and vehicle |
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 |