CN115467731A - DPF regeneration determination method, device and equipment - Google Patents

DPF regeneration determination method, device and equipment Download PDF

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Publication number
CN115467731A
CN115467731A CN202211077918.7A CN202211077918A CN115467731A CN 115467731 A CN115467731 A CN 115467731A CN 202211077918 A CN202211077918 A CN 202211077918A CN 115467731 A CN115467731 A CN 115467731A
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amount
oxygen
carbon
dpf regeneration
consumed
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安宁
解同鹏
范克川
秦海玉
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • 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
    • F01N3/025—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 using fuel burner or by adding fuel to exhaust
    • F01N3/0253—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 using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • 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
    • F01N2560/023—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting HC
    • 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 present disclosure relates to a DPF regeneration determination method, device, and apparatus, the method comprising: acquiring a first oxygen concentration measured by a first sensor positioned at the upstream of an after-treatment system and a second oxygen concentration measured by a second sensor positioned at the downstream of the after-treatment system according to a set time interval during the regeneration of the DPF; determining a first amount of oxygen to be consumed in total during DPF regeneration during said time interval based on the first oxygen concentration, the second oxygen concentration and the exhaust gas volumetric flow rate; determining an amount of carbon consumed during regeneration of the DPF during the time interval based on the first amount of oxygen and a second amount of oxygen, the second amount of oxygen being an amount of oxygen consumed during oxidation of HC during regeneration of the DPF during the time interval determined based on the amount of HC; whether to end the DPF regeneration process is determined based on the amount of carbon consumed. The method and the device can improve the accuracy of carbon amount estimation consumed in the DPF regeneration process and reduce the frequent regeneration or regeneration burnout of the DPF.

Description

DPF regeneration determination method, device and equipment
Technical Field
The disclosure relates to the technical field of diesel engine tail gas treatment, in particular to a DPF regeneration determination method, device and equipment.
Background
In Diesel aftertreatment systems, a Diesel Particulate Filter (DPF) is the most effective technology for reducing Particulate emissions. However, as particulates accumulate in the DPF, the filter pores gradually become clogged, exhaust backpressure increases, diesel efficiency decreases, and oil consumption increases. Therefore, the accumulated particulates must be periodically cleaned, i.e., the DPF is thermally regenerated. Normally, when the accumulated particulate matter in DPF reaches a certain value (such as 4 g/L), an external heat source is needed to heat the exhaust (such as injecting diesel oil into the exhaust pipe), so that the temperature of DPF inlet is maintained at 550-650 deg.C, and the combustion point of particulate matter is reached, so as to regenerate DPF.
During the regeneration of DPF, the particulate matter inside the DPF is continuously reduced, and when the particulate matter is reduced to a certain value (such as 0.5 g/L), the regeneration is considered to be successful. However, for calculating the estimated value of the reduction amount (i.e. the amount of carbon consumed) of the particulate matter in the DPF during the regeneration process, a relatively accurate calculation method is currently lacking, which causes a deviation in the calculation of the regeneration success value (e.g. 0.5 g/L), and further causes frequent regeneration (an estimated value of the amount of carbon consumed is relatively large) or regeneration burnout (an estimated value of the amount of carbon consumed is relatively small) of the DPF.
Disclosure of Invention
The present disclosure provides a DPF regeneration determination method, device, and apparatus, which improve accuracy of carbon amount estimation consumed in a DPF regeneration process, and reduce occurrence of frequent regeneration or regeneration burnout of a DPF.
According to a first aspect of an embodiment of the present disclosure, there is provided a DPF regeneration determination method including:
acquiring a first oxygen concentration measured by a first sensor positioned at the upstream of an after-treatment system and a second oxygen concentration measured by a second sensor positioned at the downstream of the after-treatment system according to a set time interval during the regeneration of the DPF;
determining a first amount of oxygen to be consumed in total during DPF regeneration during said time interval based on said first oxygen concentration, said second oxygen concentration and an exhaust gas volumetric flow rate;
determining the amount of carbon consumed during the DPF regeneration process in the time interval based on the first oxygen amount and a second oxygen amount, wherein the second oxygen amount is the amount of oxygen consumed for the oxidation reaction of the hydrocarbon in the DPF regeneration process in the time interval determined based on the hydrocarbon amount;
determining whether to end the DPF regeneration process based on the determined amount of carbon consumed.
The method comprises the following steps that during DPF regeneration, a first oxygen concentration and a second oxygen concentration upstream and downstream of an aftertreatment system can be obtained according to a set time interval; and determining the amount of carbon consumed during DPF regeneration within the time interval based on the first oxygen concentration, the second oxygen concentration, the exhaust gas volume flow and the hydrocarbon amount, improving the accuracy of estimation of the amount of carbon consumed during DPF regeneration and reducing a certain amount of work. And the present disclosure judges whether to end the DPF regeneration process based on the determined amount of carbon consumed, since the accuracy of estimation of the amount of carbon consumed in the DPF regeneration process is higher, the DPF regeneration determination accuracy is improved, and the occurrence of frequent regeneration or regeneration burnout of the DPF is reduced.
In one possible implementation, the determining an amount of carbon consumed during DPF regeneration during the time interval based on the first and second amounts of oxygen includes:
taking the difference value of the first oxygen amount and the second oxygen amount as a third oxygen amount consumed by carbon oxidation reaction in the process of DPF regeneration in the time interval;
determining an amount of carbon consumed during DPF regeneration during the time interval based on the third amount of oxygen, the relative molecular mass of carbon, and the relative molecular mass of oxygen.
According to the method, the third oxygen amount consumed by the carbon in the oxidation reaction is determined through the difference between the first oxygen amount consumed by the DPF in the regeneration process and the second oxygen amount consumed by the hydrocarbon in the oxidation reaction, and the consumed carbon amount is determined based on the third oxygen amount, so that the accuracy of estimating the consumed carbon amount in the DPF regeneration process is improved, and a certain workload is reduced.
In one possible implementation, the determining an amount of carbon consumed during DPF regeneration during the time interval based on the third amount of oxygen, the relative molecular mass of carbon, and the relative molecular mass of oxygen comprises:
determining a ratio of the relative molecular mass of the carbon to the relative molecular mass of the oxygen;
taking the product of said determined ratio and said third amount of oxygen as the amount of carbon consumed during regeneration of the DPF during said time interval.
In one possible implementation, the determining an amount of carbon consumed during DPF regeneration within the time interval based on the first and second amounts of oxygen comprises:
the sum of a first amount of carbon and the amount of carbon consumed in the DPF regeneration process during each time interval determined in addition to the amount of carbon consumed is used as the total amount of carbon consumed in the DPF regeneration process from the start of the DPF regeneration to the time interval.
The present disclosure can determine not only the amount of carbon consumed during DPF regeneration in each time interval, but also the total amount of carbon consumed during DPF regeneration from the start of DPF regeneration to the time interval, and can intuitively reflect the condition of DPF regeneration.
In one possible implementation, the determining a first amount of oxygen to be consumed in total during DPF regeneration within the time interval based on the first oxygen concentration, the second oxygen concentration, and an exhaust gas volume flow rate includes:
taking the product of the time interval and the exhaust volume flow as an exhaust volume;
determining a difference between the first oxygen concentration and the second oxygen concentration, and taking a product of the difference and the exhaust gas volume as the first oxygen amount.
The first oxygen amount determined by the first oxygen concentration, the second oxygen concentration and the exhaust volume flow rate reflects the amount of oxygen consumed by the oxidation reaction of carbon and hydrocarbon during the regeneration of the DPF during the time interval. In one possible implementation, the method further includes:
if the amount of carbon monitored in the DPF exceeds a first threshold, then it is determined that DPF regeneration is needed.
In one possible implementation, the determining whether to end the DPF regeneration process based on the determined amount of carbon consumed includes:
ending the DPF regeneration process if the difference between the monitored carbon amount and the consumed carbon amount is less than or equal to a second threshold;
and if the difference value between the monitored carbon amount and the consumed carbon amount is larger than a second threshold value, continuing to perform DPF regeneration, wherein the first threshold value is larger than the second threshold value.
According to the method, the accuracy of estimation of the carbon amount consumed in the DPF regeneration process is higher, and the accuracy of the difference value between the monitored carbon amount and the consumed carbon amount is also higher, so that the DPF regeneration judgment precision is improved, and the frequent regeneration or regeneration burnout condition of the DPF is reduced.
According to a second aspect of the embodiments of the present disclosure, there is provided a DPF regeneration determination device including:
the system comprises an acquisition module, a regeneration module and a regeneration module, wherein the acquisition module is used for acquiring a first oxygen concentration measured by a first sensor positioned at the upstream of an after-treatment system and a second oxygen concentration measured by a second sensor positioned at the downstream of the after-treatment system according to a set time interval in the DPF regeneration process;
a first determination module to determine a first amount of oxygen to be consumed in total during DPF regeneration within the time interval based on the first oxygen concentration, the second oxygen concentration, and an exhaust volumetric flow rate;
a second determining module for determining the carbon consumption in the DPF regeneration process in the time interval based on the first oxygen amount and a second oxygen amount, wherein the second oxygen amount is the oxygen consumption for the oxidation reaction of hydrocarbon in the DPF regeneration process in the time interval determined based on the hydrocarbon amount;
a determination module to determine whether to end the DPF regeneration process based on the determined amount of carbon consumed.
In one possible implementation, the second determining module is configured to determine an amount of carbon consumed during DPF regeneration in the time interval based on the first and second amounts of oxygen, and includes:
taking the difference value of the first oxygen amount and the second oxygen amount as a third oxygen amount consumed by carbon oxidation reaction in the process of DPF regeneration in the time interval;
determining an amount of carbon consumed during DPF regeneration during the time interval based on the third amount of oxygen, the relative molecular mass of carbon, and the relative molecular mass of oxygen.
In one possible implementation, the second determining module is configured to determine an amount of carbon consumed during DPF regeneration within the time interval based on the third amount of oxygen, the relative molecular mass of carbon, and the relative molecular mass of oxygen, and includes:
determining a ratio of the relative molecular mass of the carbon to the relative molecular mass of the oxygen;
taking the product of said determined ratio and said third amount of oxygen as the amount of carbon consumed during DPF regeneration during said time interval.
In one possible implementation, the second determining module, after determining the amount of carbon consumed during DPF regeneration in the time interval based on the first and second amounts of oxygen, includes:
the sum of a first amount of carbon and the amount of carbon consumed in the DPF regeneration process during each time interval determined in addition to the amount of carbon consumed is used as the total amount of carbon consumed in the DPF regeneration process from the start of the DPF regeneration to the time interval.
In one possible implementation, the first determining module, configured to determine a first amount of oxygen to be consumed in total during DPF regeneration within the time interval based on the first oxygen concentration, the second oxygen concentration, and an exhaust gas volume flow rate, includes:
taking the product of the time interval and the exhaust volume flow as the exhaust volume;
determining a difference between the first oxygen concentration and the second oxygen concentration, and taking a product of the difference and the exhaust gas volume as the first oxygen amount.
In one possible implementation, the apparatus further includes:
and the monitoring module is used for determining that DPF regeneration is needed if the monitored carbon amount in the DPF exceeds a first threshold value.
In one possible implementation, the determining module is configured to determine whether to end the DPF regeneration process based on the determined amount of carbon consumed, and includes:
ending the DPF regeneration process if the difference between the monitored carbon amount and the consumed carbon amount is less than or equal to a second threshold;
and if the difference value between the monitored carbon amount and the consumed carbon amount is larger than a second threshold value, continuing to perform DPF regeneration, wherein the first threshold value is larger than the second threshold value.
According to a third aspect of the embodiments of the present disclosure, there is provided an electronic apparatus including: a processor; a memory for storing processor-executable instructions; wherein the processor implements the steps of the above DPF regeneration determination method by executing the executable instructions.
According to a fourth aspect of the embodiments of the present disclosure, there is provided a computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement the steps of the DPF regeneration determination method described above.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart illustrating a prior art method of determining the amount of carbon consumed during DPF regeneration according to an exemplary embodiment;
FIG. 2 is a detailed schematic diagram of a prior art method of determining the amount of carbon consumed during DPF regeneration, according to an exemplary embodiment;
FIG. 3 is a schematic diagram illustrating an application scenario in accordance with an illustrative embodiment;
FIG. 4 is a flow chart illustrating a DPF regeneration determination method according to an exemplary embodiment;
FIG. 5 is a detailed flow diagram illustrating a DPF regeneration determination method according to an exemplary embodiment;
FIG. 6 is a schematic diagram illustrating an aftertreatment system in accordance with an exemplary embodiment;
FIG. 7 is a schematic diagram illustrating a DPF regeneration determination device according to an exemplary embodiment;
FIG. 8 is a schematic diagram of electronics illustrating a DPF regeneration determination method according to an exemplary embodiment;
FIG. 9 is a program product diagram illustrating a DPF regeneration determination method according to an exemplary embodiment.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure clearer, the present disclosure will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present disclosure, rather than all embodiments. All other embodiments, which can be derived by one of ordinary skill in the art from the embodiments disclosed herein without making any creative effort, shall fall within the scope of the present disclosure.
Some of the words that appear in the text are explained below:
1. the term "and/or" in the embodiments of the present disclosure describes an association relationship of associated objects, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
2. The terms "first," "second," and the like in the description and in the claims of the present disclosure and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in sequences other than those illustrated or otherwise described herein.
The application scenario described in the embodiment of the present disclosure is for more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not form a limitation on the technical solution provided in the embodiment of the present disclosure, and as a person having ordinary skill in the art knows, with the occurrence of a new application scenario, the technical solution provided in the embodiment of the present disclosure is also applicable to similar technical problems. In the description of the present disclosure, the term "plurality" means two or more unless otherwise specified.
Currently, during the regeneration of DPF, the particulate matter inside the DPF is continuously reduced, and when the particulate matter is reduced to a certain value (such as 0.5 g/L), the regeneration is considered to be successful.
The method for calculating the amount of carbon consumed in the DPF regeneration process in the prior art is shown in fig. 1, and specifically includes:
step 101, calculating the carbon load of the DPF based on a pre-established model or other modes;
102, acquiring temperatures and exhaust mass flow measured by upstream and downstream temperature sensors respectively;
103, acquiring the average temperature of the DPF based on the acquired upstream and downstream temperatures;
104, obtaining an oxidation correction factor in the regeneration process through a lookup table based on the exhaust mass flow and the DPF average temperature;
the table above records the oxidation correction factor for each combination of exhaust mass flow and DPF average temperature. For example, the exhaust gas mass flow rate is a 1 Average temperature of DPF is c 1 Then its corresponding oxidation correction factor is o 1 (ii) a Exhaust gas mass flow rate of a 1 Average temperature of DPF is c 2 Then its corresponding oxidation correction factor is o 2 。
As shown in fig. 2, after the exhaust mass flow and DPF average temperature are known, an oxidation correction factor corresponding to the exhaust mass flow and DPF average temperature can be determined by looking up a table.
105, multiplying the carbon loading capacity of the DPF by an oxidation correction factor to obtain the carbon consumption in the regeneration process of the DPF;
as shown in fig. 2, after the oxidation correction factor is determined, the product of the calculated DPF carbon loading and the oxidation correction factor is taken as the amount of carbon consumed during DPF regeneration.
Aiming at the method, the working condition change in the transient process is fast, the method for obtaining the oxidation correction factor by looking up the table cannot ensure the calculation precision, all machine types need to calibrate related tables in detail, and the calibration workload is large.
Therefore, for the estimation value of the reduction amount (i.e. the consumed carbon amount) of the particulate matter inside the DPF during the regeneration process, a relatively accurate calculation method is currently lacking, which causes deviation in the calculation of the regeneration work value (e.g. 0.5 g/L), and further causes frequent regeneration (larger estimated consumed carbon amount) or burnout (smaller estimated consumed carbon amount) of the DPF.
Therefore, in order to solve the above problems, the present disclosure provides a DPF regeneration determination method, device, and apparatus, which improve the accuracy of estimating the amount of carbon consumed during DPF regeneration, and avoid frequent regeneration or burnout of the DPF.
Referring first to fig. 3, which is a schematic view of an application scenario of the embodiment of the present disclosure, and includes an aftertreatment system 31 and an Electronic Control Unit (ECU) 32, where the aftertreatment system 31 includes: a first sensor 311, an HC injection device 312, a second sensor 313, an Oxidation Catalyst (DOC) 314, a DPF315, and a Selective Catalytic Reduction (SCR) 316. Wherein the first sensor 311 is used to measure a first oxygen concentration upstream of the aftertreatment system; a second sensor 313 for measuring a second oxygen concentration downstream of the aftertreatment system; the HC injection device 312 is used to inject Hydrocarbons (HC) into the oxidation catalyst 314; the oxidation catalyst 314 serves to convert carbon monoxide (CO) and HC in the engine exhaust into water (H) through an oxidation reaction 2 O) and carbon dioxide (CO) 2 ) (ii) a The selective catalytic reduction 316 is used for generating nitrogen by the chemical reaction of an amino reducing agent and nitrogen oxide (NOx) in the flue gas under the action of a catalystAnd water. The electronic control unit 32 is configured to obtain a first oxygen concentration from the first sensor, a second oxygen concentration from the second sensor, a hydrocarbon amount from the HC injection device, calculate an exhaust gas volume flow rate, and determine an amount of carbon consumed during DPF regeneration based on the first oxygen concentration, the second oxygen concentration, the exhaust gas volume flow rate, and the hydrocarbon amount.
In the disclosed embodiment, during DPF regeneration, the electronic control unit 32 obtains, at set time intervals, a first oxygen concentration measured by a first sensor 311 located upstream of the aftertreatment system 31 and a second oxygen concentration measured by a second sensor 313 located downstream of the aftertreatment system 31; determining a first amount of oxygen to be consumed in total during DPF regeneration during said time interval based on said first oxygen concentration, said second oxygen concentration and an exhaust gas volumetric flow rate; determining the amount of carbon consumed during the regeneration of the DPF during the time interval based on the first amount of oxygen and a second amount of oxygen, wherein the second amount of oxygen is the amount of oxygen consumed during the regeneration of the DPF during the time interval, which is determined based on the amount of hydrocarbons obtained from HC injection device 312, for the oxidation reaction of HC during the regeneration of the DPF during the time interval; determining whether to end the DPF regeneration process based on the determined amount of carbon consumed.
The embodiment of the disclosure provides a DPF regeneration determination method, and the disclosure is based on the same concept, and further provides a DPF regeneration determination device, an electronic device and a computer readable storage medium.
In some embodiments, a DPF regeneration determination method provided by the present disclosure is described below by specific embodiments, as shown in fig. 4, including:
step 401, during DPF regeneration, acquiring a first oxygen concentration measured by a first sensor positioned at the upstream of an after-treatment system and a second oxygen concentration measured by a second sensor positioned at the downstream of the after-treatment system according to a set time interval;
whether to perform DPF regeneration may be determined by a relationship between the amount of carbon in the DPF and a first threshold value. If the amount of carbon monitored in the DPF exceeds a first threshold, then it is determined that DPF regeneration is needed.
The first sensor and the second sensor can be NOx sensors, the NOx sensors generate potential differences by utilizing oxygen concentration differences of the inner side and the outer side of the oxidized zirconium under certain conditions (high temperature and platinum catalysis), the larger the concentration difference is, the larger the potential difference is, the fastest the change reaction to mixed gas is when the temperature is higher than 600 ℃, the NOx sensors are installed at the upstream and the downstream of the post-processing system and used for detecting the variation of the oxygen concentration in real time and sending the variation to the outside through standard messages.
Step 402, determining a first amount of oxygen to be consumed in total during DPF regeneration within said time interval based on said first oxygen concentration, said second oxygen concentration and an exhaust gas volume flow;
the exhaust volume flow is obtained by calculating parameters such as temperature, pressure, exhaust mass flow and the like by the ECU, and the specific calculation process is the prior art and is not described herein again.
Step 403, determining the amount of carbon consumed in the DPF regeneration process in the time interval based on the first amount of oxygen and a second amount of oxygen, wherein the second amount of oxygen is the amount of oxygen consumed in the oxidation reaction of hydrocarbons in the DPF regeneration process in the time interval determined based on the amount of hydrocarbons;
the above-described hydrocarbon amount is obtained based on the amount of HC discharged by the HC injection device.
Step 404, determining whether to end the DPF regeneration process based on the determined amount of carbon consumed.
Ending the DPF regeneration process if the difference between the monitored carbon amount and the consumed carbon amount is less than or equal to a second threshold;
and if the difference value between the monitored carbon amount and the consumed carbon amount is larger than a second threshold value, continuing to perform DPF regeneration, wherein the first threshold value is larger than the second threshold value.
This is disclosed through effective utilization install after treatment system upstream first oxygen concentration of sensor measurement with install after treatment system downstream second oxygen concentration with installing after treatment system downstream second sensor measurement additional, through in DPF regeneration process, the carbon quantity that consumes in DPF regeneration process is calculated to the change volume of upstream and downstream oxygen concentration, the accuracy of the carbon quantity estimation of consumption in the DPF regeneration process has been improved, DPF regeneration's judgement precision has also been improved, and DPF regeneration process oil consumption (frequent regeneration leads to increasing) and DPF use cost (DPF burns out and leads to the cost-push) have been reduced.
Fig. 5 shows a specific process of the DPF regeneration determination method according to the present disclosure, which includes:
step 501, monitoring the carbon amount in the DPF;
DPFs are used to reduce particulate emissions from diesel exhaust pollutants. In the working process of the trap, particulate matters are accumulated in the filter, when the particulate matters reach a certain value, the performance of the diesel engine such as dynamic performance, economical efficiency and the like is reduced, and the deposited particulate matters must be removed in time to ensure that the DPF continues to work normally, namely the DPF regeneration. In the regeneration process of the DPF, THC (total hydrocarbons) is sprayed through an in-cylinder back spray or an exhaust pipe, so that the temperature of the DPF is increased, the trapped particles are oxidized, and the DPF can acquire the capability of trapping the particles again.
Step 502, if the monitored carbon amount in the DPF exceeds a first threshold value, executing step 503, otherwise executing step 501;
the first threshold may be set according to actual conditions, and for example, the first threshold may be 4g/L.
When the relation between the monitored carbon amount in the DPF and the first threshold value is judged, messages sent by the first sensor and the second sensor are obtained, the first sensor and the second sensor are determined to be normal, if the first sensor and the second sensor are determined to have problems, the problems need to be solved, and therefore the first sensor and the second sensor can be guaranteed to normally send the messages, and the content in the messages is normal.
Step 503, determining to perform DPF regeneration;
as shown in fig. 6, after DPF regeneration is triggered, the temperature upstream of the DOC is rapidly raised by adjusting the thermal management method such as the advance angle of fuel injection or the opening degree of a throttle valve, when the temperature upstream of the DOC reaches the temperature limit value of DPF regeneration, the HC injection device injects fuel (or injects fuel into a cylinder at the end of an expansion stroke, and the fuel does not participate in work), the fuel is atomized to mainly generate unburned HC, and the unburned HC is fully mixed with exhaust gas and then can generate oxidation heat release reaction in the DOC device, so that exhaust temperature is raised, DPF regeneration is assisted, and a small amount of unburned HC in the DOC can be completely combusted in the DPF.
The following reactions are mainly found inside the DPF during DPF regeneration:
a first chemical equation of the first order,
Figure BDA0003831839030000111
in the second chemical equation, the first chemical equation,
Figure BDA0003831839030000112
step 504, determining that the set time interval is reached, executing step 505, otherwise, continuing to perform DPF regeneration;
the set time interval may be set according to actual conditions, and may be, for example, 20 milliseconds, or other time intervals.
Step 505, obtaining a first oxygen concentration measured by a first sensor located upstream of the aftertreatment system and a second oxygen concentration measured by a second sensor located downstream of the aftertreatment system;
the first and second sensors may be NOx sensors, which are primarily used to measure NOx concentrations upstream and downstream of the aftertreatment, but may also be used to measure O 2 And (4) concentration. As shown in FIG. 6, an upstream NOx sensor is mounted upstream of the DPF, and a downstream NOx sensor is mounted downstream of the DPF.
Step 506, determining a first oxygen amount which is consumed in the DPF regeneration process in the time interval on the basis of the first oxygen concentration, the second oxygen concentration and the exhaust volume flow;
wherein the specific method of determining the first amount of oxygen that is totally consumed during regeneration of the DPF during said time interval is as follows:
taking the product of the time interval and the exhaust volume flow as the exhaust volume;
determining a difference between the first oxygen concentration and the second oxygen concentration, and taking a product of the difference and the exhaust gas volume as the first oxygen amount.
The first oxygen amount a may be calculated by the following formula:
a＝(P 1 -P 2 )*V*T；
wherein, P 1 Is a first oxygen concentration, P 2 Is the second oxygen concentration, V is the exhaust gas volume flow, and T is the time interval.
Step 507, determining the carbon consumption in the DPF regeneration process in the time interval based on the first oxygen amount and the second oxygen amount;
the second amount of oxygen is an amount of oxygen consumed for oxidation of hydrocarbons during regeneration of the DPF during the time interval determined based on the amount of hydrocarbons.
The second amount of oxygen may be determined by:
since the amount of HC injected by the HC injection device during DPF regeneration is known, the following relationship can be determined using a first chemical equation:
Figure BDA0003831839030000121
wherein m is HC As amount of hydrocarbon, M HC Is the relative molecular mass of the hydrocarbon compound,
Figure BDA0003831839030000122
the amount of the second oxygen is the amount of the second oxygen,
Figure BDA0003831839030000123
is the relative molecular mass of oxygen.
From the above relationship, the following formula is determined to calculate the second oxygen amount b:
Figure BDA0003831839030000131
the above-mentioned method for determining the amount of carbon consumed during the DPF regeneration process during said time interval specifically comprises the following steps:
taking the difference value of the first oxygen amount and the second oxygen amount as a third oxygen amount consumed by carbon oxidation reaction in the process of DPF regeneration in the time interval;
determining an amount of carbon consumed during DPF regeneration during the time interval based on the third amount of oxygen, the relative molecular mass of carbon, and the relative molecular mass of oxygen.
Wherein determining an amount of carbon consumed during DPF regeneration during the time interval based on the third amount of oxygen, the relative molecular mass of carbon, and the relative molecular mass of oxygen comprises:
determining a ratio of the relative molecular mass of the carbon to the relative molecular mass of the oxygen;
taking the product of said determined ratio and said third amount of oxygen as the amount of carbon consumed during regeneration of the DPF during said time interval.
The amount of carbon consumed during DPF regeneration during the time interval may be calculated using a second chemical equation by the following equation:
Figure BDA0003831839030000132
wherein M is C Is the relative molecular mass of the carbon,
Figure BDA0003831839030000133
m is the third oxygen amount, obtained by m = a-b, a is the first oxygen amount, and b is the second oxygen amount, as the relative molecular mass of oxygen.
After determining the amount of carbon consumed during DPF regeneration during the time interval based on the first and second amounts of oxygen, comprising:
the sum of a first amount of carbon and the amount of carbon consumed in the DPF regeneration process during each time interval determined in addition to the amount of carbon consumed is used as the total amount of carbon consumed in the DPF regeneration process from the start of the DPF regeneration to the time interval.
For example, the set time interval is 20ms, and the amount of carbon consumed during DPF regeneration is determined to be A1 at 0-20 ms; determining the carbon consumption amount consumed in the DPF regeneration process as A2 in 20-40ms, and calculating A1+ A2= B1 at the moment to be used as the total carbon consumption amount consumed in the DPF regeneration process within 0-40 ms; at 40-60ms, the amount of carbon consumed during DPF regeneration is determined as A3, at which time A3+ B1= B2 is calculated as the total amount of carbon consumed during DPF regeneration for 0-60 ms.
The present disclosure can provide not only the amount of carbon consumed during DPF regeneration over each time period, but also the total amount of carbon consumed during DPF regeneration from the start of DPF regeneration to each time interval.
Step 508, determining a difference between the amount of carbon in the DPF and the amount of carbon consumed;
the difference is the amount of carbon remaining in the DPF.
For example, at 0-20ms, the amount of carbon in the DPF is 5g/L, and the amount of carbon consumed is 1g/L, the difference is 4g/L. The amount of carbon in the DPF is 4g/L for 20-40ms, and the difference is 2.5g/L if the amount of carbon consumed for 20-40ms is 1.5 g/L.
Step 509, determining that the difference is greater than the second threshold, executing step 503, otherwise, executing step 510;
wherein the first threshold is greater than a second threshold, and the second difference may be 0.5g/L.
Step 510, the DPF regeneration process is ended.
In some embodiments, based on the same inventive concept, the disclosed embodiments further provide a DPF regeneration determination apparatus, and since the apparatus is the apparatus in the method in the disclosed embodiments, and the principle of the apparatus to solve the problem is similar to the method, the implementation of the apparatus may refer to the implementation of the method, and repeated details are omitted.
As shown in fig. 7, the above apparatus includes the following modules:
an obtaining module 701, configured to obtain, at set time intervals, a first oxygen concentration measured by a first sensor located upstream of an aftertreatment system and a second oxygen concentration measured by a second sensor located downstream of the aftertreatment system during DPF regeneration;
a first determination module 702 for determining a first amount of oxygen to be consumed during DPF regeneration during the time interval based on the first oxygen concentration, the second oxygen concentration, and an exhaust gas volumetric flow rate;
a second determining module 703 for determining the amount of carbon consumed in the DPF regeneration process during the time interval based on the first oxygen amount and a second oxygen amount, wherein the second oxygen amount is the amount of oxygen consumed in the DPF regeneration process during the time interval for the oxidation reaction of the hydrocarbon determined based on the amount of the hydrocarbon;
a decision module 704 for deciding whether to end the DPF regeneration process based on the determined amount of carbon consumed.
As an optional implementation, the second determining module, configured to determine the amount of carbon consumed during DPF regeneration in the time interval based on the first and second amounts of oxygen, includes:
taking the difference between the first oxygen amount and the second oxygen amount as a third oxygen amount consumed by carbon oxidation reaction in the process of DPF regeneration in the time interval;
determining an amount of carbon consumed during DPF regeneration during the time interval based on the third amount of oxygen, the relative molecular mass of carbon, and the relative molecular mass of oxygen.
As an alternative embodiment, the second determining module for determining the amount of carbon consumed during DPF regeneration during the time interval based on the third amount of oxygen, the relative molecular mass of carbon, and the relative molecular mass of oxygen comprises:
determining a ratio of the relative molecular mass of the carbon to the relative molecular mass of the oxygen;
taking the product of said determined ratio and said third amount of oxygen as the amount of carbon consumed during regeneration of the DPF during said time interval.
As an optional implementation, the second determining module, configured to determine the amount of carbon consumed during DPF regeneration in the time interval based on the first and second oxygen amounts, includes:
the sum of a first amount of carbon and the amount of carbon consumed in the DPF regeneration process during each time interval determined in addition to the amount of carbon consumed is used as the total amount of carbon consumed in the DPF regeneration process from the start of the DPF regeneration to the time interval.
As an alternative implementation, the first determining module, configured to determine a first oxygen amount that is consumed during DPF regeneration in the time interval based on the first oxygen concentration, the second oxygen concentration and an exhaust gas volume flow, includes:
taking the product of the time interval and the exhaust volume flow as an exhaust volume;
determining a difference between the first oxygen concentration and the second oxygen concentration, and taking a product of the difference and the exhaust gas volume as the first oxygen amount.
As an optional implementation, the apparatus further comprises:
and the monitoring module is used for determining that DPF regeneration is needed if the monitored carbon amount in the DPF exceeds a first threshold value.
As an alternative embodiment, the judging module, configured to judge whether to end the DPF regeneration process based on the determined consumed carbon amount, includes:
ending the DPF regeneration process if the difference between the monitored carbon amount and the consumed carbon amount is less than or equal to a second threshold;
and if the difference value between the monitored carbon amount and the consumed carbon amount is larger than a second threshold value, continuing to perform DPF regeneration, wherein the first threshold value is larger than the second threshold value.
In some embodiments, based on the same inventive concept, a DPF regeneration determination apparatus is also provided in the disclosed embodiments, which can implement the DPF regeneration determination function discussed above, please refer to fig. 8, which includes a processor 801 and a memory 802, wherein the memory 802 is used for storing program instructions;
the processor 801 calls the program instructions stored in the memory, and executes the program instructions to implement:
acquiring a first oxygen concentration measured by a first sensor positioned at the upstream of an after-treatment system and a second oxygen concentration measured by a second sensor positioned at the downstream of the after-treatment system according to a set time interval during the regeneration of the DPF;
determining a first amount of oxygen to be consumed in total during DPF regeneration during said time interval based on said first oxygen concentration, said second oxygen concentration and an exhaust gas volumetric flow rate;
determining the amount of carbon consumed during the DPF regeneration process in the time interval based on the first oxygen amount and a second oxygen amount, wherein the second oxygen amount is the amount of oxygen consumed for the oxidation reaction of the hydrocarbon in the DPF regeneration process in the time interval determined based on the hydrocarbon amount;
determining whether to end the DPF regeneration process based on the determined amount of carbon consumed.
As an alternative embodiment, said determining the amount of carbon consumed during DPF regeneration during said time interval based on said first and second amounts of oxygen comprises:
taking the difference value of the first oxygen amount and the second oxygen amount as a third oxygen amount consumed by carbon oxidation reaction in the process of DPF regeneration in the time interval;
determining an amount of carbon consumed during DPF regeneration during the time interval based on the third amount of oxygen, the relative molecular mass of carbon, and the relative molecular mass of oxygen.
As an alternative embodiment, said determining the amount of carbon consumed during DPF regeneration during said time interval based on said third amount of oxygen, the relative molecular mass of carbon and the relative molecular mass of oxygen comprises:
determining a ratio of the relative molecular mass of the carbon to the relative molecular mass of the oxygen;
taking the product of said determined ratio and said third amount of oxygen as the amount of carbon consumed during regeneration of the DPF during said time interval.
As an alternative embodiment, after determining the amount of carbon consumed during DPF regeneration during the time interval based on the first and second amounts of oxygen, the processor is configured to:
the sum of a first amount of carbon and the amount of carbon consumed in the DPF regeneration process during each time interval determined in addition to the amount of carbon consumed is used as the total amount of carbon consumed in the DPF regeneration process from the start of the DPF regeneration to the time interval.
As an alternative embodiment, said determining a first amount of oxygen to be consumed in total during regeneration of the DPF during said time interval based on said first oxygen concentration, said second oxygen concentration and an exhaust gas volume flow rate comprises:
taking the product of the time interval and the exhaust volume flow as the exhaust volume;
determining a difference between the first oxygen concentration and the second oxygen concentration, and taking a product of the difference and the exhaust volume as the first oxygen amount.
As an optional implementation, the processor is further configured to:
if the amount of carbon in the DPF is monitored to exceed a first threshold, then it is determined that DPF regeneration is needed.
As an alternative embodiment, said judging whether to end said regeneration process at DPF based on said determined amount of carbon consumed comprises:
ending said DPF regeneration process if a difference between said monitored carbon amount and said consumed carbon amount is less than or equal to a second threshold;
and if the difference value between the monitored carbon amount and the consumed carbon amount is larger than a second threshold value, continuing to perform DPF regeneration, wherein the first threshold value is larger than the second threshold value.
In some possible embodiments, various aspects of the disclosure may also be implemented in the form of a program product, as shown in fig. 9, the computer program product 90 comprising computer program code which, when run on a computer, causes the computer to perform any of the DPF regeneration determination methods as discussed previously. Since the principle of solving the problem of the computer program product is similar to that of the DPF regeneration determination method, the implementation of the computer program product can be referred to the implementation of the method, and repeated details are not repeated.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice in the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A method for determining regeneration of a DPF of a diesel particulate filter, the method comprising:
acquiring a first oxygen concentration measured by a first sensor positioned at the upstream of an after-treatment system and a second oxygen concentration measured by a second sensor positioned at the downstream of the after-treatment system according to a set time interval during the regeneration of the DPF;
determining a first amount of oxygen to be consumed in total during DPF regeneration during said time interval based on said first oxygen concentration, said second oxygen concentration and an exhaust gas volumetric flow rate;
determining the amount of carbon consumed during the DPF regeneration process in the time interval based on the first oxygen amount and a second oxygen amount, wherein the second oxygen amount is the amount of oxygen consumed for the oxidation reaction of the hydrocarbon in the DPF regeneration process in the time interval determined based on the hydrocarbon amount;
determining whether to end the DPF regeneration process based on the determined amount of carbon consumed.
2. The method of claim 1, wherein said determining an amount of carbon consumed during DPF regeneration during said time interval based on said first and second amounts of oxygen comprises:
taking the difference value of the first oxygen amount and the second oxygen amount as a third oxygen amount consumed by carbon oxidation reaction in the process of DPF regeneration in the time interval;
determining an amount of carbon consumed during DPF regeneration during the time interval based on the third amount of oxygen, the relative molecular mass of carbon, and the relative molecular mass of oxygen.
3. The method of claim 2, wherein said determining an amount of carbon consumed during DPF regeneration within said time interval based on said third amount of oxygen, a relative molecular mass of carbon, and a relative molecular mass of oxygen comprises:
determining a ratio of the relative molecular mass of the carbon to the relative molecular mass of the oxygen;
taking the product of said determined ratio and said third amount of oxygen as the amount of carbon consumed during DPF regeneration during said time interval.
4. The method of claim 1, wherein the determining an amount of carbon consumed during DPF regeneration during the time interval based on the first and second amounts of oxygen comprises:
the sum of a first amount of carbon and the amount of carbon consumed in the DPF regeneration process during each time interval determined in addition to the amount of carbon consumed is used as the total amount of carbon consumed in the DPF regeneration process from the start of the DPF regeneration to the time interval.
5. The method of claim 1, wherein said determining a first amount of oxygen to be consumed in total during DPF regeneration within said time interval based on said first oxygen concentration, said second oxygen concentration, and an exhaust gas volumetric flow rate comprises:
taking the product of the time interval and the exhaust volume flow as the exhaust volume;
determining a difference between the first oxygen concentration and the second oxygen concentration, and taking a product of the difference and the exhaust gas volume as the first oxygen amount.
6. The method of claim 1, further comprising:
if the amount of carbon in the DPF is monitored to exceed a first threshold, then it is determined that DPF regeneration is needed.
7. The method of claim 6, wherein said determining whether to end said DPF regeneration process based on said determined amount of carbon consumed comprises:
ending the DPF regeneration process if the difference between the monitored carbon amount and the consumed carbon amount is less than or equal to a second threshold;
and if the difference value between the monitored carbon amount and the consumed carbon amount is larger than a second threshold value, continuing to perform DPF regeneration, wherein the first threshold value is larger than the second threshold value.
8. A diesel particulate trap DPF regeneration determination device, comprising:
the system comprises an acquisition module, a regeneration module and a regeneration module, wherein the acquisition module is used for acquiring a first oxygen concentration measured by a first sensor positioned at the upstream of an after-treatment system and a second oxygen concentration measured by a second sensor positioned at the downstream of the after-treatment system according to a set time interval in the DPF regeneration process;
a first determination module for determining a first amount of oxygen to be consumed in total during DPF regeneration within the time interval based on the first oxygen concentration, the second oxygen concentration, and an exhaust gas volumetric flow rate;
a second determination module for determining the amount of carbon consumed during the DPF regeneration process in the time interval based on the first oxygen amount and a second oxygen amount, wherein the second oxygen amount is the amount of oxygen consumed for the oxidation reaction of the hydrocarbon in the DPF regeneration process in the time interval, which is determined based on the amount of the hydrocarbon;
a determination module to determine whether to end the DPF regeneration process based on the determined amount of carbon consumed.
9. A DPF regeneration determination device characterized by comprising: a processor; a memory for storing processor-executable instructions; wherein the processor implements the steps of the method of any one of claims 1 to 7 by executing the executable instructions.
10. A computer readable and writable storage medium on which computer instructions are stored, characterized in that the instructions, when executed by a processor, implement the steps of the method according to any one of claims 1 to 7.
CN202211077918.7A 2022-09-05 2022-09-05 DPF regeneration determination method, device and equipment Pending CN115467731A (en)

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