CN115977773A - Method for controlling ignition of diesel oxidation catalyst in tail gas aftertreatment system - Google Patents

Method for controlling ignition of diesel oxidation catalyst in tail gas aftertreatment system Download PDF

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Publication number
CN115977773A
CN115977773A CN202211698585.XA CN202211698585A CN115977773A CN 115977773 A CN115977773 A CN 115977773A CN 202211698585 A CN202211698585 A CN 202211698585A CN 115977773 A CN115977773 A CN 115977773A
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China
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oxidation catalyst
diesel
control method
control unit
yes
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CN202211698585.XA
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刘大玲
李伟
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Tenneco Suzhou Emission System Co Ltd
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Tenneco Suzhou Emission System Co Ltd
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Priority to CN202211698585.XA priority Critical patent/CN115977773A/en
Publication of CN115977773A publication Critical patent/CN115977773A/en
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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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Abstract

A method for controlling light-off of a diesel oxidation catalyst in an exhaust aftertreatment system, comprising the steps of: s1, judging whether a diesel engine is started or not; s2, if the judgment conclusion in the step S1 is yes, judging whether the electronic control unit requests the diesel oxidation catalyst to be heated or not; s3, if the judgment conclusion of the step S2 is yes, controlling the ignition of the burner assembly; s4, performing closed-loop control on the burner assembly based on the target temperature of the inlet of the diesel oxidation catalyst; s5, judging whether the diesel oxidation catalyst reaches a light-off temperature by an electronic control unit; s6, if the judgment result in the step S5 is yes, the electronic control unit carries out regeneration control on the diesel particulate filter; if the judgment result of the step S5 is negative, returning to the step S4. The burner assembly provided by the invention replaces the active heat management of the diesel engine to carry out heat management on the tail gas aftertreatment system, thereby reducing the body consumption of the engine.

Description

Method for controlling ignition of diesel oxidation catalyst in tail gas aftertreatment system
Technical Field
The invention relates to a method for controlling ignition of a diesel oxidation catalyst in a tail gas aftertreatment system, and belongs to the technical field of engine tail gas aftertreatment.
Background
A related art exhaust aftertreatment system includes a Diesel Oxidation Catalyst (DOC), a diesel particulate trap (DPF) located downstream of the diesel oxidation catalyst, and a Selective Catalytic Reduction (SCR) located downstream of the diesel particulate trap. The diesel oxidation catalyst can react with diesel in the exhaust only in a relatively high temperature environment.
In the related art, conventional diesel oxidation catalyst light-off is realized through thermal management of the diesel engine, which undoubtedly increases the consumption of the diesel engine body and is not favorable for the performance of the diesel engine system.
Disclosure of Invention
The invention aims to provide a method for controlling the ignition of a diesel oxidation catalyst in an exhaust aftertreatment system so as to reduce the burden on a diesel engine system.
In order to achieve the purpose, the invention adopts the following technical scheme: a method of controlling light-off of a diesel oxidation catalyst 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, a diesel oxidation catalyst downstream of the burner assembly, a diesel particulate trap downstream of the diesel oxidation catalyst, and a selective catalytic reduction downstream of the diesel particulate trap, the burner assembly including a compressed air module, a fuel injection module, and an ignition coil, the method comprising the steps of:
s1, judging whether the diesel engine is started or not;
s2, if the judgment conclusion in the step S1 is yes, judging whether the electronic control unit requests the diesel oxidation catalyst to be heated or not;
s3, if the judgment conclusion of the step S2 is yes, controlling the burner assembly to ignite;
s4, performing closed-loop control on the burner assembly based on the target temperature of the inlet of the diesel oxidation catalyst;
s5, the electronic control unit judges whether the diesel oxidation catalyst reaches a light-off temperature;
s6, if the judgment result in the step S5 is yes, the electronic control unit performs regeneration control on the diesel particulate filter; and if the judgment result of the step S5 is negative, returning to the step S4.
As a further improved technical solution of the present invention, after step S1 and before step S2, the control method further includes the steps of:
and S11, waiting for an electronic control unit instruction.
As a further improved technical solution of the present invention, the control method further includes the steps of:
s21, judging whether the diesel engine is stopped or not; if the judgment result is yes, the control method is ended; if the judgment result is no, the step S11 is returned to.
As a further improved technical solution of the present invention, after step S3 and before step S4, the control method further includes the steps of:
s31, judging whether the ignition of the burner assembly is successful or not; if yes, executing step S4; if not, return to step S3.
As a further improved technical solution of the present invention, in step S2, the determination of whether the electronic control unit requests the diesel oxidation catalyst warming is determined by determining whether the electronic control unit sends the pre-diesel oxidation catalyst target temperature.
As a further improved technical solution of the present invention, in step S6, the electronic control unit performing the diesel particulate filter regeneration control includes: and injecting fuel oil into the tail gas aftertreatment system by utilizing the post-injection of the diesel engine.
As a further improved technical scheme of the invention, the tail gas aftertreatment system also comprises a hydrocarbon nozzle;
in step S6, the electronic control unit performing the diesel particulate trap regeneration control includes: and injecting fuel oil into the tail gas aftertreatment system by using the hydrocarbon nozzle.
As a further improved technical solution of the present invention, after step S6, the control method further includes the steps of:
s7, judging whether the regeneration of the diesel particulate filter is finished or not; if yes, returning to the step S11; if not, return to step S6.
As a further improved technical solution of the present invention, in step S3, if the determination result of step S2 is no, the process returns to step S11.
As a further improved technical solution of the present invention, in step S21, when the determination result of determining whether the diesel engine is stopped is yes, before ending the control method, the control method further includes: and powering off after the operation.
Compared with the prior art, the control method provided by the invention has the advantages that the burner assembly is introduced, the ignition of the diesel oxidation catalyst in the tail gas aftertreatment system is controlled, the burner assembly replaces the active heat management of the diesel engine to carry out the heat management of the tail gas aftertreatment system, and the regeneration temperature control of the diesel particulate filter is supported, so that the front temperature of the diesel oxidation catalyst reaches the ignition temperature point or above, and the body consumption of the engine is reduced.
Drawings
FIG. 1 is a schematic diagram of a diesel engine system and exhaust aftertreatment system of the present invention.
FIG. 2 is a schematic flow diagram of a method for controlling light-off of a diesel oxidation catalyst in an exhaust aftertreatment system in accordance with the invention.
Detailed Description
The following detailed description of the embodiments of the invention will be described in conjunction with the accompanying drawings, in which, if there are several embodiments, the features of these embodiments can be combined with each other without conflict. When the description refers to the accompanying drawings, like numbers or symbols in different drawings represent the same or similar elements unless otherwise specified. The statements made in the following exemplary embodiments do not represent all embodiments of the present invention, but rather they are merely examples of products consistent with the present invention as recited in the claims of the present invention.
The terminology used in the description of the invention herein 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 the use of terms such as "first," "second," and the like, in the description and in the claims of the present invention do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another.
Referring to FIG. 1, an exhaust aftertreatment system 100 configured to be coupled downstream in an exhaust direction from a diesel engine system 200 is disclosed. 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 located downstream of the burner assembly 1, a diesel particulate trap 3 (DPF) located downstream of the diesel oxidation catalyst 2, a selective catalytic reduction device 4 (SCR) located downstream of the diesel particulate trap 3, an ammonia slip catalyst 5 (ASC) located downstream of the selective catalytic reduction device 4, and a urea nozzle 6 located between the diesel particulate trap 3 and the selective catalytic reduction device 4. The urea nozzle 6 is used for spraying atomized urea liquid drops into the tail gas, ammonia gas is generated after the urea is decomposed, and the ammonia gas is used as a chemical substance to be mixed with the tail gas and to generate a reduction reaction on the selective catalytic reducer 4 so as to reduce harmful substances in the tail gas. The above-described principle of exhaust gas aftertreatment will be apparent to those skilled in the art and the present invention will not be described in detail. In order to increase 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, wherein the Controller 14 may be integrated with the electronic control unit, or the Controller 14 and the electronic control unit are separate control units. The controller 14 communicates with the electronic control unit.
Referring to fig. 2, the method for controlling the light-off of the diesel oxidation catalyst 2 in the exhaust aftertreatment system 100 according to the present invention includes the following steps:
s1, judging whether the diesel engine 201 is started or not;
s2, if the judgment conclusion in the step S1 is yes, judging whether the electronic control unit requests the diesel oxidation catalyst 2 to heat up or not;
s3, if the judgment conclusion in the step S2 is yes, controlling the combustor assembly 1 to ignite;
s4, performing closed-loop control on the burner assembly 1 based on the target temperature of the inlet of the diesel oxidation catalyst 2;
s5, the electronic control unit judges whether the diesel oxidation catalyst 2 reaches the ignition temperature or not;
s6, if the judgment result in the step S5 is yes, the electronic control unit carries out regeneration control on the diesel particulate filter 3; if the judgment result of the step S5 is negative, returning to the step S4.
In the illustrated embodiment of the present invention, after step S1 and before step S2, the control method further includes the steps of:
and S11, waiting for an electronic control unit instruction.
The control method further comprises the following steps:
s21, determining whether the diesel engine 201 is stopped; if the judgment result is yes, the control method is ended; if the judgment result is no, the step S11 is returned to.
In step S21, when the determination result of determining whether the diesel engine 201 is stopped is yes, before ending the control method, the control method further includes: and powering off after the operation.
In step S2, the determination as to whether the electronic control unit requests the diesel oxidation catalyst 2 to be warmed up is determined by determining whether the electronic control unit transmits the pre-target temperature of the diesel oxidation catalyst 2.
In step S3, if the determination result of step S2 is no, the process returns to step S11.
After step S3 and before step S4, the control method further includes the steps of:
s31, judging whether the ignition of the burner assembly 1 is successful or not; if yes, executing step S4; if not, return to step S3.
In step S6, the electronic control unit performing the regeneration control of the diesel particulate trap 3 includes: the post-injection of the diesel engine 201 is used to inject fuel into the exhaust aftertreatment system 100.
As another alternative, the exhaust aftertreatment system 100 further comprises a hydrocarbon nozzle 7;
in step S6, the electronic control unit performing the regeneration control of the diesel particulate trap 3 includes: the hydrocarbon injector 7 is used to inject fuel into the exhaust aftertreatment system 100.
The temperature of exhaust is improved through the burner assembly 1, and when the temperature of the exhaust reaches the ignition temperature of the diesel oxidation catalyst 2, fuel injected by a system is oxidized and regenerated on the diesel oxidation catalyst 2, so that the heat management and decoupling of the diesel engine body can be reduced, the system can reach different temperatures according to needs, and the coating amount of precious metals on a carrier can be reduced, so that the cost is saved.
According to the control method, a mode that the diesel oxidation catalyst 2 oxidizes and supports regeneration of the diesel particulate filter 3 is introduced, exhaust gas is heated through the burner assembly 1, and the diesel particulate filter 3 is regenerated by matching with the characteristic of aftertreatment, so that the efficiency is improved, and the consumption of an engine body is reduced.
After step S6, the control method further includes the steps of:
s7, judging whether the regeneration of the diesel particulate filter 3 is finished or not; if yes, returning to the step S11; if not, return to step S6.
The above embodiments are only for illustrating the invention and not for limiting the technical solutions described in the invention, and the understanding of the present specification should be based on the technical personnel in the field, and although the present specification has described the invention in detail with reference to the above embodiments, the technical personnel in the field should understand that the technical personnel in the field can still make modifications or equivalent substitutions to the present invention, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present invention should be covered in the claims of the present invention.

Claims (10)

1. A method of controlling light-off of a diesel oxidation catalyst 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, a diesel oxidation catalyst downstream of the burner assembly, a diesel particulate trap downstream of the diesel oxidation catalyst, and a selective catalytic reduction downstream of the diesel particulate trap, the burner assembly including a compressed air module, a fuel injection module, and an ignition coil, the method comprising the steps of:
s1, judging whether the diesel engine is started or not;
s2, if the judgment conclusion of the step S1 is yes, judging whether the electronic control unit requests the diesel oxidation catalyst to be heated or not;
s3, if the judgment result in the step S2 is yes, controlling the burner assembly to ignite;
s4, performing closed-loop control on the burner assembly based on the target temperature of the inlet of the diesel oxidation catalyst;
s5, the electronic control unit judges whether the diesel oxidation catalyst reaches the ignition temperature or not;
s6, if the judgment result in the step S5 is yes, the electronic control unit carries out regeneration control on the diesel particulate filter; if the judgment result of the step S5 is negative, returning to the step S4.
2. The control method according to claim 1, characterized in that: after step S1 and before step S2, the control method further includes the steps of:
and S11, waiting for an electronic control unit instruction.
3. The control method according to claim 2, 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, the control method is ended; if the judgment result is no, the step S11 is returned to.
4. The control method according to claim 1, characterized in that: after step S3 and before step S4, the control method further includes the steps of:
s31, judging whether the ignition of the burner assembly is successful or not; if yes, executing step S4; if not, return to step S3.
5. The control method according to claim 1, characterized in that: in step S2, determining whether the electronic control unit requests the diesel oxidation catalyst to be warmed up is determined by determining whether the electronic control unit transmits the pre-diesel oxidation catalyst target temperature.
6. The control method according to claim 1, characterized in that: in step S6, the electronic control unit performing the diesel particulate trap regeneration control includes: and injecting fuel oil into the tail gas aftertreatment system by utilizing the post-injection of the diesel engine.
7. The control method according to claim 1, characterized in that: the tail gas aftertreatment system further comprises a hydrocarbon nozzle;
in step S6, the electronic control unit performing the diesel particulate trap regeneration control includes: and injecting fuel oil into the exhaust aftertreatment system by using the hydrocarbon nozzle.
8. The control method according to claim 2, characterized in that: after step S6, the control method further includes the steps of:
s7, judging whether the regeneration of the diesel particulate filter is finished or not; if yes, returning to the step S11; if not, return to step S6.
9. The control method according to claim 2, characterized in that: in step S3, if the determination result of step S2 is no, the process returns to step S11.
10. A control method according to claim 3, characterized in that: in step S21, when the determination result of determining whether the diesel engine is stopped is yes, before ending the control method, the control method further includes: and powering off after the operation.
CN202211698585.XA 2022-12-28 2022-12-28 Method for controlling ignition of diesel oxidation catalyst in tail gas aftertreatment system Pending CN115977773A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211698585.XA CN115977773A (en) 2022-12-28 2022-12-28 Method for controlling ignition of diesel oxidation catalyst in tail gas aftertreatment system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211698585.XA CN115977773A (en) 2022-12-28 2022-12-28 Method for controlling ignition of diesel oxidation catalyst in tail gas aftertreatment system

Publications (1)

Publication Number Publication Date
CN115977773A true CN115977773A (en) 2023-04-18

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CN202211698585.XA Pending CN115977773A (en) 2022-12-28 2022-12-28 Method for controlling ignition of diesel oxidation catalyst in tail gas aftertreatment system

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