CN116181459A - Control method for regeneration of diesel particulate filter in tail gas aftertreatment system - Google Patents
Control method for regeneration of diesel particulate filter in tail gas aftertreatment system Download PDFInfo
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- CN116181459A CN116181459A CN202211699334.3A CN202211699334A CN116181459A CN 116181459 A CN116181459 A CN 116181459A CN 202211699334 A CN202211699334 A CN 202211699334A CN 116181459 A CN116181459 A CN 116181459A
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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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
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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
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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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/14—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a fuel burner
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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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- 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)
- Chemical Kinetics & Catalysis (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
A control method for DPF regeneration in an exhaust aftertreatment system, comprising the steps of: s1, judging whether the diesel engine is started or not; s2, waiting for an ECU instruction; s3, judging whether the ECU requests DPF regeneration or not and judging the mode of DPF regeneration; s31, if the DPF regeneration mode in the step S3 is ignition regeneration, executing the step S41; if the DPF regeneration mode in the step S3 is the fuel injection oxidation regeneration, executing the step S42; s41, igniting the burner assembly, and executing step S5; s42, raising the temperature of exhaust gas through thermal management of the diesel engine; s421, judging whether the DOC reaches the ignition temperature; s422, controlling the burner assembly to spray oil to the DOC to oxidize and raise the temperature, and executing a step S5; s5, judging whether DPF regeneration is completed or not; and S6, if the judgment in the step S5 is yes, returning to the step S2.
Description
Technical Field
The invention relates to a control method for regenerating a diesel particle catcher in an exhaust aftertreatment system, and belongs to the technical field of engine exhaust aftertreatment.
Background
The exhaust aftertreatment system in the related art includes a Diesel Oxidation Catalyst (DOC), a diesel particulate trap (DPF) located downstream of the diesel oxidation catalyst, and a Selective Catalytic Reducer (SCR) located downstream of the diesel particulate trap.
Engine post-injection is commonly used in the related art to effect regeneration of the diesel particulate trap.
Disclosure of Invention
The invention aims to provide a control method for realizing regeneration of a diesel particulate filter in an exhaust aftertreatment system at least partially by utilizing a burner assembly.
In order to achieve the above purpose, the invention adopts the following technical scheme: a method of controlling regeneration of a diesel particulate trap in an exhaust aftertreatment system configured to be connected downstream of a diesel engine in an exhaust direction, the exhaust aftertreatment system including a burner assembly including a compressed air module, a fuel injection module, and an ignition coil, a diesel oxidation catalyst downstream of the burner assembly, a diesel particulate trap downstream of the diesel oxidation catalyst, and a selective catalytic reducer downstream of the diesel particulate trap, the method comprising the steps of:
s1, judging whether the diesel engine is started or not;
s2, if the judgment in the step S1 is yes, waiting for an instruction of the electronic control unit;
s3, judging whether the electronic control unit requests the regeneration of the diesel particle catcher and the regeneration mode of the diesel particle catcher, wherein the regeneration mode of the diesel particle catcher is ignition regeneration or oil injection oxidation regeneration;
s31, if the judgment in the step S3 is yes, and the regeneration mode of the diesel particulate filter is ignition regeneration, executing the step S41; if the judgment in the step S3 is yes, and the regeneration mode of the diesel particulate filter is oil injection oxidation regeneration, executing the step S42;
s41, igniting the burner assembly, and executing step S5;
s42, raising the temperature of exhaust gas through thermal management of the diesel engine;
s421, judging whether the diesel oxidation catalyst reaches the ignition temperature;
s422, if the judgment in the step S421 is yes, controlling the burner assembly to spray fuel to the diesel oxidation catalyst to oxidize and raise the temperature, and executing the step S5; if the judgment in the step S421 is NO, returning to the step S42;
s5, judging whether regeneration of the diesel particulate filter is finished or not;
and S6, if the judgment in the step S5 is yes, returning to the step S2.
As a further improved technical solution of the present invention, the control method further includes the following steps:
s21, judging whether the diesel engine is stopped or not; if the judgment result is yes, ending the control method; if it is judged whether or not, the process returns to step S2.
As a further improved technical scheme of the present invention, in step S3, the ignition regeneration is a full ignition regeneration; when the ignition regeneration in step S31 is a full ignition regeneration, the control method further includes, after step S41 and before step S5, the steps of:
s411, judging whether the ignition of the burner assembly is successful; if yes, go to step S412; if not, returning to step S41;
s412, the burner assembly performs closed loop control based on a target temperature of an inlet of the diesel particulate trap.
As a further improved technical scheme of the present invention, in step S3, the ignition regeneration is a partial ignition regeneration; when the ignition regeneration in step S31 is a partial ignition regeneration, the control method further includes the steps of, after step S41, before step S5:
s411', judging whether the ignition of the burner assembly is successful; if yes, go to step S412'; if not, returning to step S41;
s412', the burner assembly performs closed loop control based on a target temperature of an inlet of the diesel oxidation catalyst.
As a further improved technical solution of the present invention, after step S412', the control method further includes the following steps:
s413', judging whether the diesel oxidation catalyst reaches the ignition temperature; if the determination in step S413 'is yes, step S414' is performed; if the judgment in the step S413 'is NO, returning to the step S412';
s414', the electronic control unit calculates the fuel injection quantity according to the carrier temperature and controls the fuel injection into the tail gas aftertreatment system;
in step S6, if the determination in step S5 is no, the process returns to step S414'.
As a further improved technical solution of the present invention, in step S414', a post-injection of the diesel engine is performed to inject fuel into the exhaust aftertreatment system; or alternatively
The exhaust aftertreatment system further includes a hydrocarbon nozzle that injects fuel into the exhaust aftertreatment system in step S414'.
As a further improved technical scheme of the invention, in the step S3, the oil-spraying oxidation regeneration is a complete oil-spraying oxidation regeneration; when the oil-injected oxidation regeneration in step S31 is a complete oil-injected oxidation regeneration, step S422 includes the following sub-steps:
s4221, the electronic control unit calculates the oil injection quantity according to the carrier temperature and sends an oil injection control signal to the controller;
s4222, judging whether the controller receives the oil injection control signal; if yes, go to step S4223; if not, return to step S4221;
s4223, controlling the burner assembly to spray oil to the diesel oxidation catalyst to oxidize and raise the temperature;
in step S6, if the determination in step S5 is no, the process returns to step S4223.
As a further improved technical scheme of the invention, in step S3, the oil-spraying oxidation regeneration is a partial oil-spraying oxidation regeneration; when the fuel injection oxidation regeneration in step S31 is a partial fuel injection oxidation regeneration, step S422 includes the following sub-steps:
s4221', calculating the total fuel injection quantity by the electronic control unit according to the carrier temperature;
s4222' the controller sending the maximum and minimum injection amounts of said fuel injection module to the electronic control unit;
s4223', the electronic control unit distributes the total fuel injection quantity;
s4224' the electronic control unit sends an injection control signal to the controller to control injection of fuel from said burner assembly to said diesel oxidation catalyst and to perform post-injection of fuel from said diesel engine into said exhaust aftertreatment system.
As a further improved technical solution of the present invention, in step S4224', the electronic control unit sends an injection control signal to the controller to control the burner assembly to inject fuel into the diesel oxidation catalyst, including:
s42241', judging whether the controller receives the oil injection control signal; if yes, go to step S42242'; if not, returning to step S4223';
s42242', controlling the burner assembly to spray oil to the diesel oxidation catalyst to oxidize and raise the temperature;
in step S6, if the determination in step S5 is no, the process returns to step S42242'.
As a further improvement of the present invention, in step S4224', the step of performing post-injection of fuel from the diesel engine into the exhaust aftertreatment system may be replaced by injecting fuel from a hydrocarbon nozzle into the exhaust aftertreatment system.
Compared with the prior art, the control method of the invention introduces the burner assembly, and whether the diesel particulate filter regeneration mode is ignition regeneration or oil injection oxidation regeneration, the burner assembly is utilized to increase the temperature of the exhaust gas, thereby improving the efficiency of the diesel particulate filter regeneration.
Drawings
Fig. 1 is a schematic diagram of a diesel engine system and an exhaust aftertreatment system of the present invention.
FIG. 2 is a flow chart of a method for controlling regeneration of a diesel particulate filter in an exhaust aftertreatment system of the present invention.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the attached drawings, wherein features of the embodiments may be combined with each other without conflict if several embodiments exist. When the description refers to the accompanying drawings, the same numbers or symbols in different drawings indicate the same or similar elements unless otherwise indicated. What is described in the following exemplary embodiments does not represent all embodiments of the invention, but rather is merely an example of a product consistent with the invention as set forth in the claims of the invention.
The terminology used in the present invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention. It should be understood that words such as "first," "second," and the like, used in the description and in the claims of the present invention, do not denote any order, quantity, or importance, but rather are names used to distinguish one feature from another.
Referring to FIG. 1, an exhaust aftertreatment system 100 is disclosed that is configured to be coupled downstream of a diesel engine system 200 in an exhaust direction. The diesel engine system 200 includes a diesel engine 201, an intake system 202, an Electronic Control Unit (ECU), and the like.
The exhaust aftertreatment system 100 includes a burner assembly 1, a Diesel Oxidation Catalyst (DOC) 2 downstream of the burner assembly 1, a diesel particulate trap (DPF) 3 downstream of the diesel oxidation catalyst 2, a Selective Catalytic Reducer (SCR) 4 downstream of the diesel particulate trap 3, an Ammonia Slip Catalyst (ASC) 5 downstream of the selective catalytic reducer 4, and a urea nozzle 6 between the diesel particulate trap 3 and the selective catalytic reducer 4. The urea nozzle 6 is used for spraying atomized urea droplets into the exhaust gas, ammonia gas is generated after the urea is decomposed, the ammonia gas is used as a chemical substance to be mixed with the exhaust gas, and a reduction reaction occurs on the selective catalytic reducer 4 so as to reduce harmful substances in the exhaust gas. The principle of the exhaust gas aftertreatment described above will be obvious to those skilled in the art, and the present invention will not be repeated. In order to enhance the evaporation of the urea, the exhaust aftertreatment system 100 further comprises a mixer 9 between the urea nozzle 6 and the selective catalytic reducer 4.
The burner assembly 1 comprises a compressed air module 11, a fuel injection module 12 and an ignition coil 13. The burner assembly 1 further comprises a Controller (Controller) 14, which Controller 14 may be integrated with the electronic control unit or the Controller 14 and the electronic control unit may be separate control units. The controller 14 communicates with the electronic control unit.
Referring to fig. 2, the control method for regenerating the diesel particulate filter 3 in the exhaust aftertreatment system 100 of the present invention includes the following steps:
s1, judging whether the diesel engine 201 is started or not;
s2, if the judgment in the step S1 is yes, waiting for an instruction of the electronic control unit;
s3, judging whether the electronic control unit requests the regeneration of the diesel particle catcher 3 and the regeneration mode of the diesel particle catcher 3, wherein the regeneration mode of the diesel particle catcher 3 is ignition regeneration or oil injection oxidation regeneration;
s31, if the judgment in the step S3 is yes, and the regeneration mode of the diesel particulate filter 3 is ignition regeneration, executing the step S41; if the judgment in the step S3 is yes, and the regeneration mode of the diesel particulate filter 3 is oil injection oxidation regeneration, executing the step S42;
s41, the burner assembly 1 is ignited, and step S5 is performed;
s42, raising the temperature of the exhaust gas by thermal management of the diesel engine 201;
s421, judging whether the diesel oxidation catalyst 2 reaches the ignition temperature;
s422, if the judgment in the step S421 is yes, controlling the burner assembly 1 to spray fuel to the diesel oxidation catalyst 2 to oxidize and raise the temperature, and executing the step S5; if the judgment in the step S421 is NO, returning to the step S42;
s5, judging whether the regeneration of the diesel particulate filter 3 is finished or not;
and S6, if the judgment in the step S5 is yes, returning to the step S2.
In the illustrated embodiment of the invention, the control method further includes the steps of:
s21, judging whether the diesel engine 201 is stopped; if the judgment result is yes, ending the control method; if it is judged whether or not, the process returns to step S2.
In step S21, when the determination of whether the diesel engine 201 is stopped is yes, the control method further includes, before ending the present control method: and (3) after the operation and power-off.
In step S3, the ignition regeneration is a full ignition regeneration; when the ignition regeneration in step S31 is a full ignition regeneration, the control method further includes, after step S41 and before step S5, the steps of:
s411, judging whether the ignition of the burner assembly 1 is successful; if yes, go to step S412; if not, returning to step S41;
s412, the burner assembly 1 performs closed-loop control based on the target temperature of the inlet of the diesel particulate filter 3.
In step S3, the ignition regeneration is a partial ignition regeneration; when the ignition regeneration in step S31 is a partial ignition regeneration, the control method further includes the steps of, after step S41, before step S5:
s411', judging whether the ignition of the burner assembly 1 is successful; if yes, go to step S412'; if not, returning to step S41;
s412', the burner assembly 1 performs closed-loop control based on the target temperature of the inlet of the diesel oxidation catalyst.
The control method further includes the following steps after step S412':
s413', judging whether the diesel oxidation catalyst 2 reaches the ignition temperature; if the determination in step S413 'is yes, step S414' is performed; if the judgment in the step S413 'is NO, returning to the step S412';
s414', the electronic control unit calculates the fuel injection quantity according to the carrier temperature and controls the fuel injection into the exhaust aftertreatment system 100;
in step S6, if the determination in step S5 is no, the process returns to step S414'.
In step S414', a post-injection of fuel from the diesel engine 201 into the exhaust aftertreatment system 100 is performed; or alternatively
The exhaust aftertreatment system 100 further comprises a hydrocarbon nozzle 7, the hydrocarbon nozzle 7 injecting fuel into the exhaust aftertreatment system 100 in step S414'.
In step S3, the oil injection oxidation regeneration is a complete oil injection oxidation regeneration; when the oil-injected oxidation regeneration in step S31 is a complete oil-injected oxidation regeneration, step S422 includes the following sub-steps:
s4221, the electronic control unit calculates the oil injection quantity according to the carrier temperature, and sends an oil injection control signal to the controller 14;
s4222, judging whether the controller 14 receives the fuel injection control signal; if yes, go to step S4223; if not, return to step S4221;
s4223, controlling the fuel injection of the burner assembly 1 to the diesel oxidation catalyst 2 to oxidize and raise the temperature;
in step S6, if the determination in step S5 is no, the process returns to step S4223.
In step S3, the oil injection oxidation regeneration is a partial oil injection oxidation regeneration; when the fuel injection oxidation regeneration in step S31 is a partial fuel injection oxidation regeneration, step S422 includes the following sub-steps:
s4221', calculating the total fuel injection quantity by the electronic control unit according to the carrier temperature;
s4222' the controller sending the maximum and minimum injection amounts of said fuel injection module 12 to the electronic control unit;
s4223', the electronic control unit distributes the total fuel injection quantity;
s4224', the electronic control unit sends an injection control signal to the controller 14 to control the injection of fuel from said burner assembly 1 to said diesel oxidation catalyst 2 and to perform a post-injection of fuel from said diesel engine 201 into said exhaust aftertreatment system 100.
In step S4224', the electronic control unit sends an injection control signal to the controller 14 to control the injection of fuel from said burner assembly 1 to said diesel oxidation catalyst 2, comprising:
s42241', determining whether said controller 14 receives said fuel injection control signal; if yes, go to step S42242'; if not, returning to step S4223';
s42242', controlling the burner assembly 1 to inject fuel to the diesel oxidation catalyst 2 to oxidize and raise the temperature;
in step S6, if the determination in step S5 is no, the process returns to step S42242'.
In other embodiments of the present invention, the step of performing post-injection of fuel from the diesel engine 201 into the exhaust aftertreatment system 100 in step S4224' may be replaced by injecting fuel into the exhaust aftertreatment system 100 through the hydrocarbon nozzle 7.
In the illustrated embodiment of the present invention, the full ignition regeneration, the partial ignition regeneration, the full injection oxidation regeneration, and the partial injection oxidation regeneration are determined in the set order. Of course, it will be appreciated by those skilled in the art that the sequence of full ignition regeneration, partial ignition regeneration, full injection oxidation regeneration, and partial injection oxidation regeneration may be flexibly adjusted. When the judgment results of the full ignition regeneration, the partial ignition regeneration, the full fuel injection oxidation regeneration and the partial fuel injection oxidation regeneration are all negative, the control method executes other steps (such as cold start, heat preservation, preheating and the like).
Compared with the prior art, the control method of the invention introduces the burner assembly 1, the burner assembly 1 can perform heat management, and the burner assembly 1 is utilized to raise the temperature of the exhaust gas whenever the diesel particulate filter 3 is regenerated in a mode of ignition regeneration or oil injection oxidation regeneration, thereby improving the efficiency of the regeneration of the diesel particulate filter 3.
The above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and it should be understood that the present invention should be based on those skilled in the art, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the present invention without departing from the spirit and scope of the present invention and modifications thereof should be covered by the scope of the claims of the present invention.
Claims (10)
1. A method of controlling regeneration of a diesel particulate trap in an exhaust aftertreatment system configured to be connected downstream of a diesel engine in an exhaust direction, the exhaust aftertreatment system including a burner assembly including a compressed air module, a fuel injection module, and an ignition coil, a diesel oxidation catalyst downstream of the burner assembly, a diesel particulate trap downstream of the diesel oxidation catalyst, and a selective catalytic reducer downstream of the diesel particulate trap, the method comprising the steps of:
s1, judging whether the diesel engine is started or not;
s2, if the judgment in the step S1 is yes, waiting for an instruction of the electronic control unit;
s3, judging whether the electronic control unit requests the regeneration of the diesel particle catcher and the regeneration mode of the diesel particle catcher, wherein the regeneration mode of the diesel particle catcher is ignition regeneration or oil injection oxidation regeneration;
s31, if the judgment in the step S3 is yes, and the regeneration mode of the diesel particulate filter is ignition regeneration, executing the step S41; if the judgment in the step S3 is yes, and the regeneration mode of the diesel particulate filter is oil injection oxidation regeneration, executing the step S42;
s41, igniting the burner assembly, and executing step S5;
s42, raising the temperature of exhaust gas through thermal management of the diesel engine;
s421, judging whether the diesel oxidation catalyst reaches the ignition temperature;
s422, if the judgment in the step S421 is yes, controlling the burner assembly to spray fuel to the diesel oxidation catalyst to oxidize and raise the temperature, and executing the step S5; if the judgment in the step S421 is NO, returning to the step S42;
s5, judging whether regeneration of the diesel particulate filter is finished or not;
and S6, if the judgment in the step S5 is yes, returning to the step S2.
2. The control method according to claim 1, characterized in that: the control method further comprises the following steps:
s21, judging whether the diesel engine is stopped or not; if the judgment result is yes, ending the control method; if it is judged whether or not, the process returns to step S2.
3. The control method according to claim 1, characterized in that: in step S3, the ignition regeneration is a full ignition regeneration; when the ignition regeneration in step S31 is a full ignition regeneration, the control method further includes, after step S41 and before step S5, the steps of:
s411, judging whether the ignition of the burner assembly is successful; if yes, go to step S412; if not, returning to step S41;
s412, the burner assembly performs closed loop control based on a target temperature of an inlet of the diesel particulate trap.
4. The control method according to claim 1, characterized in that: in step S3, the ignition regeneration is a partial ignition regeneration; when the ignition regeneration in step S31 is a partial ignition regeneration, the control method further includes the steps of, after step S41, before step S5:
s411', judging whether the ignition of the burner assembly is successful; if yes, go to step S412'; if not, returning to step S41;
s412', the burner assembly performs closed loop control based on a target temperature of an inlet of the diesel oxidation catalyst.
5. The control method according to claim 4, characterized in that: the control method further includes the following steps after step S412':
s413', judging whether the diesel oxidation catalyst reaches the ignition temperature; if the determination in step S413 'is yes, step S414' is performed; if the judgment in the step S413 'is NO, returning to the step S412';
s414', the electronic control unit calculates the fuel injection quantity according to the carrier temperature and controls the fuel injection into the tail gas aftertreatment system;
in step S6, if the determination in step S5 is no, the process returns to step S414'.
6. The control method according to claim 5, characterized in that: in step S414', performing post-injection of fuel from the diesel engine into the exhaust aftertreatment system; or alternatively
The exhaust aftertreatment system further includes a hydrocarbon nozzle that injects fuel into the exhaust aftertreatment system in step S414'.
7. The control method according to claim 1, characterized in that: in step S3, the oil injection oxidation regeneration is a complete oil injection oxidation regeneration; when the oil-injected oxidation regeneration in step S31 is a complete oil-injected oxidation regeneration, step S422 includes the following sub-steps:
s4221, the electronic control unit calculates the oil injection quantity according to the carrier temperature and sends an oil injection control signal to the controller;
s4222, judging whether the controller receives the oil injection control signal; if yes, go to step S4223; if not, return to step S4221;
s4223, controlling the burner assembly to spray oil to the diesel oxidation catalyst to oxidize and raise the temperature;
in step S6, if the determination in step S5 is no, the process returns to step S4223.
8. The control method according to claim 1, characterized in that: in step S3, the oil injection oxidation regeneration is a partial oil injection oxidation regeneration; when the fuel injection oxidation regeneration in step S31 is a partial fuel injection oxidation regeneration, step S422 includes the following sub-steps:
s4221', calculating the total fuel injection quantity by the electronic control unit according to the carrier temperature;
s4222' the controller sending the maximum and minimum injection amounts of said fuel injection module to the electronic control unit;
s4223', the electronic control unit distributes the total fuel injection quantity;
s4224' the electronic control unit sends an injection control signal to the controller to control injection of fuel from said burner assembly to said diesel oxidation catalyst and to perform post-injection of fuel from said diesel engine into said exhaust aftertreatment system.
9. The control method according to claim 8, characterized in that: in step S4224', the electronic control unit sends an injection control signal to the controller to control injection of said burner assembly to said diesel oxidation catalyst, comprising:
s42241', judging whether the controller receives the oil injection control signal; if yes, go to step S42242'; if not, returning to step S4223';
s42242', controlling the burner assembly to spray oil to the diesel oxidation catalyst to oxidize and raise the temperature;
in step S6, if the determination in step S5 is no, the process returns to step S42242'.
10. The control method according to claim 8, characterized in that: in step S4224', the step of performing post-injection of fuel from the diesel engine into the exhaust aftertreatment system may be replaced by injecting fuel into the exhaust aftertreatment system through a hydrocarbon nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211699334.3A CN116181459A (en) | 2022-12-28 | 2022-12-28 | Control method for regeneration of diesel particulate filter in tail gas aftertreatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211699334.3A CN116181459A (en) | 2022-12-28 | 2022-12-28 | Control method for regeneration of diesel particulate filter in tail gas aftertreatment system |
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| CN116181459A true CN116181459A (en) | 2023-05-30 |
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| CN202211699334.3A Pending CN116181459A (en) | 2022-12-28 | 2022-12-28 | Control method for regeneration of diesel particulate filter in tail gas aftertreatment system |
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2022
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