CN116146317B - DPF regeneration uniformity control method and device, electronic equipment and storage medium - Google Patents
DPF regeneration uniformity control method and device, electronic equipment and storage medium Download PDFInfo
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- CN116146317B CN116146317B CN202310426480.7A CN202310426480A CN116146317B CN 116146317 B CN116146317 B CN 116146317B CN 202310426480 A CN202310426480 A CN 202310426480A CN 116146317 B CN116146317 B CN 116146317B
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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
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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
- 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
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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
- F01N2250/00—Combinations of different methods of purification
- F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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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
- 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
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1411—Exhaust gas flow rate, e.g. mass flow rate or volumetric flow rate
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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
- 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
- F01N2900/1602—Temperature of exhaust gas apparatus
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- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The application discloses a control method and a device for uniform regeneration of a DPF, electronic equipment and a storage medium, wherein the method comprises the following steps: when the regeneration request of the two paths of DPFs is detected, determining a DPF upstream temperature target value based on the exhaust gas mass flow and the DOC upstream temperature measured value; determining HC injection amounts of the first DPF and the second DPF by performing closed-loop control on two temperature differences based on two temperature differences of a DPF upstream temperature target value and a DOC upstream actual temperature value of the two DPFs; determining the regenerated fuel injection quantity of the first path DPF and the regenerated fuel injection quantity of the second path DPF respectively with the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF based on the feedforward HC injection quantity and the preset fuel injection boundary; and performing regeneration control on the first path DPF based on the regeneration oil injection quantity of the first path DPF, and performing regeneration control on the second path DPF based on the regeneration oil injection quantity of the second path DPF.
Description
Technical Field
The application relates to the technical field of automobile control, in particular to a control method and device for uniform DPF regeneration, electronic equipment and a storage medium.
Background
Because the post-treatment of the automobile is added with one path of DOC (Diesel Oxidation Catalysis), diesel oxidation catalyst) +DPF (diesel particulate filter and diesel particulate matter catcher) and two paths of DOC+DPF, when the regenerated oil injection air flow is uneven, the temperatures of the two paths of DPF are caused to deviate greatly, and further the carrier inside the DPF is damaged by burning and melting, and the use reliability of the DPF is improved.
In the prior art, the regeneration oil injection amount is determined mainly based on the maximum value or the average value of the upper and lower DPF upstream temperature sensors, and then the regeneration temperature control of the two-way DPF is performed based on the regeneration oil injection amount, so that the reliability of DPF use is realized.
However, since the regeneration temperature of the two-way DPF is controlled according to the same regeneration fuel injection amount, the control of the regeneration fuel injection amount of one of the two-way DPF may be inaccurate, thereby affecting the reliability of the two-way DPF.
Disclosure of Invention
Based on the defects of the prior art, the application provides a control method and device for uniformly regenerating DPF, electronic equipment and storage medium, so as to solve the problem that the prior art affects the reliability of double DPFs.
In order to achieve the above object, the present application provides the following technical solutions:
the first aspect of the present application provides a control method for uniformly regenerating a DPF, comprising:
when the regeneration request of the two paths of DPFs is detected, determining a DPF upstream temperature target value based on the exhaust gas mass flow and the DOC upstream temperature measured value;
determining HC injection quantity of the first path DPF and HC injection quantity of the second path DPF by performing closed loop control on the first temperature difference and the second temperature difference based on a first temperature difference between the DPF upstream temperature target value and the DOC upstream actual temperature value of the first path DPF and a second temperature difference between the DPF upstream temperature target value and the DOC upstream actual temperature value of the second path DPF;
based on the feedforward HC injection quantity and a preset oil injection boundary, determining the regenerated oil injection quantity of the first path DPF and the regenerated oil injection quantity of the second path DPF respectively with the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF;
and performing regeneration control on the first path DPF based on the regeneration oil injection quantity of the first path DPF, and performing regeneration control on the second path DPF based on the regeneration oil injection quantity of the second path DPF.
Optionally, in the above control method for uniformly regenerating a DPF, the determining the HC injection amount of the first DPF and the HC injection amount of the second DPF by performing closed-loop control on the temperature difference based on the temperature difference between the temperature target value of the upstream of the DPF and the DOC upstream of the actual temperature value of the first DPF and the temperature difference between the temperature target value of the upstream of the DPF and the DOC upstream of the actual temperature value of the second DPF includes:
subtracting the DOC upstream actual temperature value of the first path DPF from the DPF upstream temperature target value to obtain a first temperature difference;
subtracting the DOC upstream actual temperature value of the second path DPF from the DPF upstream temperature target value to obtain a second temperature difference;
the first temperature difference and the second temperature difference are respectively sent to a PI controller for closed-loop control, and a closed-loop result of the first path DPF and a closed-loop result of the second path DPF are obtained;
and determining the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF based on the closed loop result of the first path DPF and the closed loop result of the second path DPF.
Optionally, in the control method for uniformly regenerating the DPF, before determining the regenerated fuel injection amount of the first DPF and the regenerated fuel injection amount of the second DPF based on the feedforward HC injection amount and the preset fuel injection boundary, the control method further includes:
calculating a target temperature difference between a DPF upstream temperature target value and the DOC upstream temperature measured value;
calculating a regeneration release heat based on the exhaust gas mass flow, the hot melt of the exhaust gas, and the target temperature difference; the hot melting is obtained by searching a CUR table based on the DOC upstream temperature value;
calculating a feed-forward HC injection amount based on the regeneration release heat, the fuel heating value and the conversion efficiency of HC in the DOC; the conversion efficiency of HC in the DOC is obtained by searching a MAP table based on the temperature value at the upstream of the DOC and the exhaust gas mass flow.
Optionally, in the above control method for uniformly regenerating a DPF, the determining the regenerated fuel injection amount of the first DPF and the regenerated fuel injection amount of the second DPF based on the feedforward HC injection amount and the preset fuel injection boundary and the HC injection amount of the first DPF and the HC injection amount of the second DPF respectively includes:
adding the feedforward HC injection quantity with the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF respectively to obtain a first target injection quantity of the first path DPF and a second target injection quantity of the second path DPF;
judging whether a preset oil injection boundary is smaller than the first target injection quantity or not, and judging whether the preset oil injection boundary is smaller than the second target injection quantity or not;
if the preset oil injection boundary is judged to be smaller than the first target injection quantity, and if the preset oil injection boundary is judged to be smaller than the second target injection quantity, determining the preset oil injection boundary as the regenerated oil injection quantity of the first path DPF and the regenerated oil injection quantity of the second path DPF;
if the preset oil injection boundary is not less than the first target injection quantity, and if the preset oil injection boundary is not less than the second target injection quantity, the first target injection quantity is determined to be the regenerated oil injection quantity of the first path DPF, and the second target injection quantity is determined to be the regenerated oil injection quantity of the second path DPF.
A second aspect of the present application provides a control apparatus for uniformly regenerating a DPF, comprising:
a target value determination unit for determining a DPF upstream temperature target value based on the exhaust gas mass flow and the DOC upstream temperature measurement value when it is detected that two DPFs have regeneration requests;
a closed loop control unit, configured to determine an HC injection amount of a first DPF and an HC injection amount of a second DPF by performing closed loop control on the first temperature difference and the second temperature difference based on a first temperature difference between the DPF upstream temperature target value and a DOC upstream actual temperature value of the first DPF and a second temperature difference between the DPF upstream temperature target value and a DOC upstream actual temperature value of the second DPF;
the regenerated fuel injection amount determining unit is used for determining the regenerated fuel injection amount of the first path DPF and the regenerated fuel injection amount of the second path DPF based on the feedforward HC injection amount and a preset fuel injection boundary and the HC injection amount of the first path DPF and the HC injection amount of the second path DPF respectively;
and the regeneration control unit is used for performing regeneration control on the first path DPF based on the regeneration oil injection quantity of the first path DPF and performing regeneration control on the second path DPF based on the regeneration oil injection quantity of the second path DPF.
Optionally, in the control device for uniformly regenerating a DPF, the closed-loop control unit includes:
the first obtaining unit is used for subtracting the DOC upstream actual temperature value of the first path DPF from the DPF upstream temperature target value to obtain a first temperature difference;
the second obtaining unit is used for subtracting the DOC upstream actual temperature value of the second path DPF from the DPF upstream temperature target value to obtain a second temperature difference;
the control unit is used for respectively sending the first temperature difference and the second temperature difference to a PI controller for closed-loop control to obtain a closed-loop result of the first path DPF and a closed-loop result of the second path DPF;
and the injection quantity determining unit is used for determining the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF based on the closed loop result of the first path DPF and the closed loop result of the second path DPF.
Optionally, the control device for uniformly regenerating a DPF further includes:
a first calculation unit for calculating a target temperature difference between a DPF upstream temperature target value and the DOC upstream temperature measurement value;
a second calculation unit for calculating a regeneration release heat based on the exhaust gas mass flow rate, the hot melt of the exhaust gas, and the target temperature difference; the hot melting is obtained by searching a CUR table based on the DOC upstream temperature value;
a third calculation unit for calculating a feedforward HC injection amount based on the regeneration release heat, the fuel calorific value, and the conversion efficiency of HC in the DOC; the conversion efficiency of HC in the DOC is obtained by searching a MAP table based on the temperature value at the upstream of the DOC and the exhaust gas mass flow.
Optionally, in the control device for uniformly regenerating a DPF, the regeneration fuel injection amount determining unit includes:
a summation unit, configured to sum a feedforward HC injection amount with an HC injection amount of the first DPF and an HC injection amount of the second DPF, respectively, to obtain a first target injection amount of the first DPF and a second target injection amount of the second DPF;
the judging unit is used for judging whether a preset oil injection boundary is smaller than the first target injection quantity or not and judging whether the preset oil injection boundary is smaller than the second target injection quantity or not;
the first determining unit is configured to determine the preset fuel injection boundary as a regenerated fuel injection amount of the first path DPF and a regenerated fuel injection amount of the second path DPF if the preset fuel injection boundary is determined to be smaller than the first target injection amount and if the preset fuel injection boundary is determined to be smaller than the second target injection amount;
and the second determining unit is used for determining the first target injection quantity as the regenerated injection quantity of the first path DPF and determining the second target injection quantity as the regenerated injection quantity of the second path DPF if the preset injection boundary is not less than the first target injection quantity and the preset injection boundary is not less than the second target injection quantity.
A third aspect of the present application provides an electronic device, comprising:
a memory and a processor;
wherein the memory is used for storing programs;
the processor is configured to execute the program, and when the program is executed, the program is specifically configured to implement a control method for uniformly regenerating a DPF as set forth in any one of the above.
A fourth aspect of the present application provides a computer storage medium storing a computer program which, when executed, is adapted to carry out a control method of DPF regeneration uniformity as set forth in any one of the preceding claims.
The application provides a control method for uniform DPF regeneration, which is characterized in that when regeneration requests of two paths of DPFs are detected, a DPF upstream temperature target value is determined based on exhaust gas mass flow and a DOC upstream temperature measurement value, then a first temperature difference between the DPF upstream temperature target value and a DOC upstream actual temperature value of a first path of DPF and a second temperature difference between the DPF upstream temperature target value and a DOC upstream actual temperature value of a second path of DPF are based, the first temperature difference and the second temperature difference are subjected to closed loop control to determine HC injection quantity of the first path of DPF and HC injection quantity of the second path of DPF, then based on feedforward HC injection quantity and a preset oil injection boundary, regeneration oil injection quantity of the first path of DPF and regeneration oil injection quantity of the second path of DPF are respectively determined, finally regeneration control is carried out on the first path of DPF based on the regeneration oil injection quantity of the first path of DPF and regeneration oil injection quantity of the second path of DPF, and regeneration control is carried out on the second path of DPF based on the regeneration oil injection quantity of the second path of DPF. Therefore, the regeneration temperature of the double-path DPF is controlled according to the regeneration oil injection quantity of the first path DPF and the second path DPF, and the reliability of double-DPF use can be effectively realized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an engine aftertreatment device according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of a control method for DPF regeneration uniformity provided by an embodiment of the application;
FIG. 3 is a flow chart of a method for determining HC injection quantity according to an embodiment of the present application;
FIG. 4 is a flow chart of a method for calculating feed-forward HC injection quantity according to an embodiment of the present application;
FIG. 5 is a flowchart of a method for determining a regenerated fuel injection amount according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a control device for DPF regeneration uniformity according to another embodiment of the present application;
fig. 7 is a schematic structural diagram of an electronic device according to another embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the present application, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The application provides a control method for uniform DPF regeneration, which solves the problem that the prior art affects the reliability of double DPFs, so in order to realize the control method for uniform DPF regeneration, in particular, an embodiment of the application provides an engine aftertreatment device, as shown in figure 1, comprising: exhaust gas after TC (turbo Charger) is discharged after two HC injections 20, two DOC+DPF, urea injection 50 and two SCR+ASC (Ammonia Slip Catalyst, ammonia oxidation catalyst).
Wherein the temperature sensors 30 are respectively arranged at the upstream of the two DPFs, and NO is also arranged on the exhaust pipe at the upstream of the DOC X The differential pressure sensor 40 is also provided in each of the two DPFs, the temperature sensor 30 is provided in the exhaust line upstream of the SCR, and the NO is provided in the exhaust line downstream of the ASC X Sensor 10, temperature sensor 30, and PM sensor 60.
Based on the above-mentioned engine aftertreatment device, the control method for uniformly regenerating the DPF provided by the embodiment of the present application, as shown in fig. 2, specifically includes the following steps:
s201, when two paths of DPFs are detected to have regeneration requests, determining a DPF upstream temperature target value based on the exhaust gas mass flow and the DOC upstream temperature measured value.
Specifically, in the embodiment of the application, two paths of DOCs and DPFs are added in the automobile aftertreatment system in parallel, so that when the system detects that regeneration requests exist for the two paths of DPFs, the upstream temperature of the two paths of DOCs is controlled to be higher than the HC light-off temperature through a thermal management measure, and then the waste mass flow and a measured value of the upstream temperature of the DOCs are sent to the ECU to determine a target value of the upstream temperature of the DPFs, wherein the measured value of the upstream temperature of the DOCs refers to a value measured by a temperature sensor arranged at the upstream of the two paths of DOCs.
Alternatively, the temperature target value upstream of the DPF may be 600 ℃, but may be other temperature thresholds, which may be specifically set according to the requirements.
S202, determining HC injection quantity of the first path DPF and HC injection quantity of the second path DPF by performing closed loop control on the first temperature difference and the second temperature difference based on the first temperature difference between the DPF upstream temperature target value and the DOC upstream actual temperature value of the first path DPF and the second temperature difference between the DPF upstream temperature target value and the DOC upstream actual temperature value of the second path DPF.
The temperature sensors are disposed upstream of the two DPFs, so that the DOC upstream actual temperature value of the first DPF and the DOC upstream actual temperature value of the second DPF are measured by the two temperature sensors disposed upstream of the two DPFs. Specifically, the closed loop control is respectively performed by taking the first temperature difference and the second temperature difference as feedback values, so that the HC injection quantity of the first path of DPF and the HC injection quantity of the second path of DPF can be obtained respectively, the regeneration of the DPF can be controlled by the accurate fuel injection quantity of the two subsequent paths of DPFs, the reliability of the double DPFs is further ensured, and the regeneration control of the two paths of DPFs based on the same fuel injection quantity is avoided.
Optionally, in another embodiment of the present application, a specific implementation of step S202, as shown in fig. 3, includes the following steps:
s301, subtracting the DOC upstream actual temperature value of the first path DPF from the DPF upstream temperature target value to obtain a first temperature difference.
The first temperature difference between the target value of the temperature upstream of the DPF and the actual value of the temperature upstream of the DOC of the first DPF is calculated in advance, so that the HC injection amount required for the regeneration of the first DPF is deposited by the first temperature difference in the subsequent step, and the regeneration control of the first DPF is further performed.
S302, subtracting the DOC upstream actual temperature value of the second path DPF from the DPF upstream temperature target value to obtain a second temperature difference.
The second temperature difference between the target value of the temperature upstream of the DPF and the actual value of the temperature upstream of the DOC of the second DPF is calculated in advance, and is a regeneration control of the second DPF in order to deposit the HC injection amount required for the regeneration of the second DPF by the second temperature difference later.
S303, respectively sending the first temperature difference and the second temperature difference to a PI controller for closed-loop control to obtain a closed-loop result of the first path DPF and a closed-loop result of the second path DPF.
Specifically, the PI controller is a linear controller, and may constitute a control deviation according to a given temperature difference, and then constitute a fuel injection control amount by linearly combining the proportional and integral of the deviation, and feed back a report generated by the fuel injection control amount to the system.
S304, determining the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF based on the closed loop result of the first path DPF and the closed loop result of the second path DPF.
Specifically, based on the information in the two closed loop results, the HC injection amount of the first DPF and the HC injection amount of the second DPF are determined.
S203, determining the regenerated fuel injection quantity of the first path DPF and the regenerated fuel injection quantity of the second path DPF based on the feedforward HC injection quantity and the preset fuel injection boundary and the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF respectively.
Specifically, the feed-forward HC injection quantity and the preset injection boundary can properly adjust the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF, so that the regenerated fuel injection quantity of the first path DPF and the regenerated fuel injection quantity of the second path DPF can be better determined.
Optionally, since the regenerated fuel injection amount of the first DPF and the regenerated fuel injection amount of the second DPF can be determined based on the feedforward HC injection amount and the preset fuel injection boundary after the feedforward HC injection amount is calculated, before executing step S203, as shown in fig. 4, an embodiment of the present application provides a method for calculating the feedforward HC injection amount, which includes the following steps:
s401, calculating a target temperature difference between a DPF upstream temperature target value and a DOC upstream temperature measured value.
In order to facilitate the subsequent rapid calculation of the regeneration heat release amount and to improve the calculation efficiency, the target temperature difference between the DPF upstream temperature target value and the DOC upstream temperature measurement value is calculated in advance.
S402, calculating regeneration release heat based on the exhaust gas mass flow, the hot melting of the exhaust gas and the target temperature difference.
The hot melting is obtained by searching a CUR table based on the DOC upstream temperature value.
The regeneration heat quantity required to be released by the first path of DPF and the second path of DPF is calculated in advance, and the feedforward HC injection quantity can be calculated based on the heat quantity, so that the regeneration oil injection quantity of the first path of DPF and the second path of DPF can be adjusted by the feedforward HC injection quantity subsequently, and the phenomenon of regeneration over-temperature in a DPF furnace is avoided.
Specifically, the calculation formula of the regeneration release heat is:。
wherein c is the hot melting of the exhaust gas, m is the mass flow of the exhaust gas,is the target temperature difference.
S403, calculating the feed-forward HC injection quantity based on the regeneration release heat, the fuel calorific value and the conversion efficiency of HC in the DOC.
The conversion efficiency of HC in the DOC is obtained by looking up a MAP table based on the upstream temperature value of the DOC and the mass flow of exhaust gas.
Specifically, the calculation expression of the feedforward HC injection amount is: q=q/fuel heating value/conversion efficiency of HC in DOC.
Where Q is the feed-forward HC injection quantity and Q is the regeneration release heat.
Alternatively, in another embodiment of the present application, another specific implementation of step S203, as shown in fig. 5, includes the following steps:
s501, adding the feedforward HC injection quantity to the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF respectively to obtain a first target injection quantity of the first path DPF and a second target injection quantity of the second path DPF.
Specifically, the regeneration fuel injection amount of the dpf=the feedforward HC injection amount+the HC injection amount, and therefore step S501 needs to be performed to obtain the regeneration fuel injection amounts of the dual DPF, i.e., the first target injection amount and the second target injection amount.
S502, judging whether the preset oil injection boundary is smaller than the first target injection quantity or not, and judging whether the preset oil injection boundary is smaller than the second target injection quantity or not.
It should be noted that, based on the preset fuel injection boundary, the first target injection amount and the second target are respectively reduced to finally determine the regenerated fuel injection amount of the first path DPF and the regenerated fuel injection amount of the second path DPF, so that the fuel injection amount can be prevented from being more to a certain extent, and thus the over-temperature during the regeneration of the dual DPFs is prevented, and the reliability of the dual DPFs is further affected. If the preset fuel injection boundary is not less than the first target injection quantity, and if the preset fuel injection boundary is not less than the second target injection quantity, step S504 is performed.
S503, determining a preset oil injection boundary as the regenerated oil injection quantity of the first path DPF and the regenerated oil injection quantity of the second path DPF.
Specifically, when the preset fuel injection boundary is determined to be smaller than the first target injection quantity and the preset fuel injection boundary is determined to be smaller than the second target injection quantity, the first target injection quantity and the second target injection quantity are higher, and the DPF is more reliable due to the fact that the regeneration uniformity of the double DPFs needs to be controlled, so that the preset fuel injection boundary is determined to be the regeneration fuel injection quantity of the first DPF and the regeneration fuel injection quantity of the second DPF.
S504, determining the first target injection quantity as the regenerated oil injection quantity of the first path DPF, and determining the second target injection quantity as the regenerated oil injection quantity of the second path DPF.
When the preset fuel injection boundary is not less than the first target injection quantity and the preset fuel injection boundary is not less than the second target injection quantity, the first target injection quantity and the second target injection quantity are required to meet the injection requirement and cannot cause the harm of regeneration overtemperature to the double DPFs, so that the first target injection quantity is required to be determined as the regenerated fuel injection quantity of the first DPF and the second target injection quantity is required to be determined as the regenerated fuel injection quantity of the second DPF.
S204, performing regeneration control on the first path DPF based on the regeneration oil injection quantity of the first path DPF, and performing regeneration control on the second path DPF based on the regeneration oil injection quantity of the second path DPF.
Specifically, in the embodiment of the application, two nozzles installed at the upstream of two paths of DOCs are used for performing HC injection on a first path of DPF according to the regenerated fuel injection quantity of the first path of DPF and performing HC injection on a second path of DPF according to the regenerated fuel injection quantity of the second path of DPF, so that more uniform regenerated fuel injection quantity and uniform double DPF regeneration are realized.
The application provides a control method for uniform DPF regeneration, which is characterized in that when regeneration requests of two paths of DPFs are detected, a DPF upstream temperature target value is determined based on exhaust gas mass flow and a DOC upstream temperature measurement value, then a first temperature difference between the DPF upstream temperature target value and a DOC upstream actual temperature value of a first path of DPF and a second temperature difference between the DPF upstream temperature target value and a DOC upstream actual temperature value of a second path of DPF are based, the first temperature difference and the second temperature difference are subjected to closed loop control to determine HC injection quantity of the first path of DPF and HC injection quantity of the second path of DPF, then based on feedforward HC injection quantity and a preset oil injection boundary, regeneration oil injection quantity of the first path of DPF and regeneration oil injection quantity of the second path of DPF are respectively determined, finally regeneration control is carried out on the first path of DPF based on the regeneration oil injection quantity of the first path of DPF and regeneration oil injection quantity of the second path of DPF, and regeneration control is carried out on the second path of DPF based on the regeneration oil injection quantity of the second path of DPF. Therefore, the regeneration temperature of the double-path DPF is controlled according to the regeneration oil injection quantity of the first path DPF and the second path DPF, and the reliability of double-DPF use can be effectively realized.
Another embodiment of the present application provides a control apparatus for uniformly regenerating a DPF, as shown in fig. 6, comprising the following units:
the target value determining unit 601 is configured to determine a DPF upstream temperature target value based on the exhaust gas mass flow and the DOC upstream temperature measurement value when it is detected that two paths of DPFs are in regeneration request.
The closed loop control unit 602 is configured to determine the HC injection amount of the first DPF and the HC injection amount of the second DPF by performing closed loop control on the first temperature difference and the second temperature difference based on a first temperature difference between the DPF upstream temperature target value and the DOC upstream actual temperature value of the first DPF and a second temperature difference between the DPF upstream temperature target value and the DOC upstream actual temperature value of the second DPF.
The regenerated fuel injection amount determining unit 603 is configured to determine the regenerated fuel injection amount of the first DPF and the regenerated fuel injection amount of the second DPF based on the feedforward HC injection amount and the preset fuel injection boundary, and the HC injection amount of the first DPF and the HC injection amount of the second DPF, respectively.
The regeneration control unit 604 is configured to perform regeneration control on the first DPF based on the regeneration oil injection amount of the first DPF, and perform regeneration control on the second DPF based on the regeneration oil injection amount of the second DPF.
Optionally, in another embodiment of the present application, in the control device for uniformly regenerating a DPF, the closed-loop control unit 602 includes the following units:
the first obtaining unit is used for subtracting the DOC upstream actual temperature value of the first path DPF from the DPF upstream temperature target value to obtain a first temperature difference.
And a second obtaining unit, configured to subtract the DOC upstream actual temperature value of the second DPF from the DPF upstream temperature target value to obtain a second temperature difference.
And the control unit is used for respectively sending the first temperature difference and the second temperature difference to the PI controller for closed-loop control to obtain a closed-loop result of the first path DPF and a closed-loop result of the second path DPF.
And the injection quantity determining unit is used for determining the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF based on the closed loop result of the first path DPF and the closed loop result of the second path DPF.
Optionally, in the control device for uniformly regenerating a DPF provided in another embodiment of the present application, the control device further includes:
a first calculation unit for calculating a target temperature difference between a DPF upstream temperature target value and a DOC upstream temperature measurement value.
And a second calculation unit for calculating a regeneration release heat based on the exhaust gas mass flow rate, the hot melt of the exhaust gas, and the target temperature difference.
The hot melting is obtained by searching a CUR table based on the DOC upstream temperature value.
And a third calculation unit for calculating a feed-forward HC injection amount based on the regeneration release heat, the fuel heating value, and the conversion efficiency of HC in the DOC.
The conversion efficiency of HC in the DOC is obtained by looking up a MAP table based on the upstream temperature value of the DOC and the mass flow of exhaust gas.
Optionally, in the control device for uniformly regenerating a DPF according to another embodiment of the present application, the regeneration fuel injection amount determining unit 603 includes the following units:
and the adding unit is used for adding the feedforward HC injection quantity with the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF respectively to obtain a first target injection quantity of the first path DPF and a second target injection quantity of the second path DPF.
And the judging unit is used for judging whether the preset oil injection boundary is smaller than the first target injection quantity and judging whether the preset oil injection boundary is smaller than the second target injection quantity.
The first determining unit is configured to determine the preset fuel injection boundary as a regenerated fuel injection amount of the first DPF and a regenerated fuel injection amount of the second DPF if the preset fuel injection boundary is determined to be smaller than the first target injection amount and if the preset fuel injection boundary is determined to be smaller than the second target injection amount.
And the second determining unit is used for determining the first target injection quantity as the regenerated injection quantity of the first path DPF and determining the second target injection quantity as the regenerated injection quantity of the second path DPF if the preset injection boundary is not less than the first target injection quantity and the preset injection boundary is not less than the second target injection quantity.
It should be noted that, the specific working process of each unit provided in the above embodiment of the present application may refer to the corresponding steps in the above method embodiment, which is not described herein.
Another embodiment of the present application provides an electronic device, as shown in fig. 7, including:
a memory 701 and a processor 702.
Wherein the memory 701 is used for storing a program.
The processor 702 is configured to execute a program, and when the program is executed, is specifically configured to implement a control method for uniformly regenerating a DPF as provided in any one of the embodiments described above.
Another embodiment of the present application provides a computer storage medium storing a computer program which, when executed, is configured to implement a control method for DPF regeneration uniformity as provided in any one of the above embodiments.
Computer storage media, including both non-transitory and non-transitory, removable and non-removable media, may be implemented in any method or technology for storage of information. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, read only compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by the computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A control method for regeneration uniformity of a DPF, comprising:
when the regeneration request of the two paths of DPFs is detected, determining a DPF upstream temperature target value based on the exhaust gas mass flow and the DOC upstream temperature measured value;
determining HC injection quantity of the first path DPF and HC injection quantity of the second path DPF by performing closed loop control on the first temperature difference and the second temperature difference based on a first temperature difference between the DPF upstream temperature target value and the DOC upstream actual temperature value of the first path DPF and a second temperature difference between the DPF upstream temperature target value and the DOC upstream actual temperature value of the second path DPF;
based on the feedforward HC injection quantity and a preset oil injection boundary, determining the regenerated oil injection quantity of the first path DPF and the regenerated oil injection quantity of the second path DPF with the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF respectively, wherein the method comprises the following steps: adding the feedforward HC injection quantity with the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF respectively to obtain a first target injection quantity of the first path DPF and a second target injection quantity of the second path DPF; judging whether a preset oil injection boundary is smaller than the first target injection quantity or not, and judging whether the preset oil injection boundary is smaller than the second target injection quantity or not; if the preset oil injection boundary is judged to be smaller than the first target injection quantity, and if the preset oil injection boundary is judged to be smaller than the second target injection quantity, determining the preset oil injection boundary as the regenerated oil injection quantity of the first path DPF and the regenerated oil injection quantity of the second path DPF; if the preset oil injection boundary is not less than the first target injection quantity, and if the preset oil injection boundary is not less than the second target injection quantity, determining the first target injection quantity as the regenerated oil injection quantity of the first path DPF, and determining the second target injection quantity as the regenerated oil injection quantity of the second path DPF;
and performing regeneration control on the first path DPF based on the regeneration oil injection quantity of the first path DPF, and performing regeneration control on the second path DPF based on the regeneration oil injection quantity of the second path DPF.
2. The method according to claim 1, wherein determining the HC injection amount of the first DPF and the HC injection amount of the second DPF by closed-loop controlling the temperature difference based on the temperature difference between the DPF upstream temperature target value and the DOC upstream actual temperature value of the first DPF and the temperature difference between the DPF upstream temperature target value and the DOC upstream actual temperature value of the second DPF comprises:
subtracting the DOC upstream actual temperature value of the first path DPF from the DPF upstream temperature target value to obtain a first temperature difference;
subtracting the DOC upstream actual temperature value of the second path DPF from the DPF upstream temperature target value to obtain a second temperature difference;
the first temperature difference and the second temperature difference are respectively sent to a PI controller for closed-loop control, and a closed-loop result of the first path DPF and a closed-loop result of the second path DPF are obtained;
and determining the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF based on the closed loop result of the first path DPF and the closed loop result of the second path DPF.
3. The method of claim 1, wherein before determining the regenerated fuel injection amount of the first DPF and the regenerated fuel injection amount of the second DPF based on the feedforward HC injection amount and the preset fuel injection boundary, respectively, the method further comprises:
calculating a target temperature difference between a DPF upstream temperature target value and the DOC upstream temperature measured value;
calculating a regeneration release heat based on the exhaust gas mass flow, the hot melt of the exhaust gas, and the target temperature difference; the hot melting is obtained by searching a CUR table based on the DOC upstream temperature value;
calculating a feed-forward HC injection amount based on the regeneration release heat, the fuel heating value and the conversion efficiency of HC in the DOC; the conversion efficiency of HC in the DOC is obtained by searching a MAP table based on the temperature value at the upstream of the DOC and the exhaust gas mass flow.
4. A control device for uniformly regenerating a DPF, comprising:
a target value determination unit for determining a DPF upstream temperature target value based on the exhaust gas mass flow and the DOC upstream temperature measurement value when it is detected that two DPFs have regeneration requests;
a closed loop control unit, configured to determine an HC injection amount of a first DPF and an HC injection amount of a second DPF by performing closed loop control on the first temperature difference and the second temperature difference based on a first temperature difference between the DPF upstream temperature target value and a DOC upstream actual temperature value of the first DPF and a second temperature difference between the DPF upstream temperature target value and a DOC upstream actual temperature value of the second DPF;
the regenerated fuel injection amount determining unit is used for determining the regenerated fuel injection amount of the first path DPF and the regenerated fuel injection amount of the second path DPF based on the feedforward HC injection amount and a preset fuel injection boundary and the HC injection amount of the first path DPF and the HC injection amount of the second path DPF respectively;
the regenerated fuel injection amount determining unit includes: an adding unit, a judging unit, a first determining unit and a second determining unit;
the adding unit is used for adding the feedforward HC injection quantity with the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF respectively to obtain a first target injection quantity of the first path DPF and a second target injection quantity of the second path DPF;
the judging unit is used for judging whether a preset oil injection boundary is smaller than the first target injection quantity or not and judging whether the preset oil injection boundary is smaller than the second target injection quantity or not;
the first determining unit is configured to determine the preset oil injection boundary as a regenerated oil injection amount of the first DPF and a regenerated oil injection amount of the second DPF if the preset oil injection boundary is determined to be smaller than the first target injection amount and if the preset oil injection boundary is determined to be smaller than the second target injection amount;
the second determining unit is configured to determine, if the preset fuel injection boundary is determined not to be smaller than the first target injection amount, and if the preset fuel injection boundary is determined not to be smaller than the second target injection amount, the first target injection amount as a regenerated fuel injection amount of the first DPF, and determine the second target injection amount as a regenerated fuel injection amount of the second DPF;
and the regeneration control unit is used for performing regeneration control on the first path DPF based on the regeneration oil injection quantity of the first path DPF and performing regeneration control on the second path DPF based on the regeneration oil injection quantity of the second path DPF.
5. The apparatus of claim 4, wherein the closed loop control unit comprises:
the first obtaining unit is used for subtracting the DOC upstream actual temperature value of the first path DPF from the DPF upstream temperature target value to obtain a first temperature difference;
the second obtaining unit is used for subtracting the DOC upstream actual temperature value of the second path DPF from the DPF upstream temperature target value to obtain a second temperature difference;
the control unit is used for respectively sending the first temperature difference and the second temperature difference to a PI controller for closed-loop control to obtain a closed-loop result of the first path DPF and a closed-loop result of the second path DPF;
and the injection quantity determining unit is used for determining the HC injection quantity of the first path DPF and the HC injection quantity of the second path DPF based on the closed loop result of the first path DPF and the closed loop result of the second path DPF.
6. The apparatus as recited in claim 4, further comprising:
a first calculation unit for calculating a target temperature difference between a DPF upstream temperature target value and the DOC upstream temperature measurement value;
a second calculation unit for calculating a regeneration release heat based on the exhaust gas mass flow rate, the hot melt of the exhaust gas, and the target temperature difference; the hot melting is obtained by searching a CUR table based on the DOC upstream temperature value;
a third calculation unit for calculating a feedforward HC injection amount based on the regeneration release heat, the fuel calorific value, and the conversion efficiency of HC in the DOC; the conversion efficiency of HC in the DOC is obtained by searching a MAP table based on the temperature value at the upstream of the DOC and the exhaust gas mass flow.
7. An electronic device, comprising:
a memory and a processor;
wherein the memory is used for storing programs;
the processor is configured to execute the program, which when executed, is specifically configured to implement a control method for regeneration uniformity of a DPF as set forth in any one of claims 1 to 3.
8. A computer storage medium storing a computer program which, when executed, is adapted to carry out a control method of DPF regeneration uniformity as claimed in any one of claims 1 to 3.
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