CN114961946A - Method for metering an exhaust gas reducing agent and computer program product - Google Patents

Method for metering an exhaust gas reducing agent and computer program product Download PDF

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Publication number
CN114961946A
CN114961946A CN202110191312.5A CN202110191312A CN114961946A CN 114961946 A CN114961946 A CN 114961946A CN 202110191312 A CN202110191312 A CN 202110191312A CN 114961946 A CN114961946 A CN 114961946A
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CN
China
Prior art keywords
pressure
reducing agent
metering
pipeline
exhaust gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110191312.5A
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Chinese (zh)
Inventor
刘毅
M·沃尔巴赫
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Robert Bosch GmbH
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Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to CN202110191312.5A priority Critical patent/CN114961946A/en
Publication of CN114961946A publication Critical patent/CN114961946A/en
Pending legal-status Critical Current

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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
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2610/1426—Filtration means
    • 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
    • F01N2610/1433—Pumps
    • 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)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention provides a method for metering an exhaust gas reducing agent, which is used for a metering device of the exhaust gas reducing agent, wherein the metering device comprises a supply module and a metering module, the supply module is in liquid communication with a reducing agent tank through a suction pipeline and a return pipeline, the metering device comprises a delivery pump for sucking the reducing agent, a pressure pipeline for connecting the metering module and the delivery pump, a pressure sensor arranged on the pressure pipeline and used for measuring the pressure on the pressure pipeline, one end of the return pipeline is connected to one end of the pressure pipeline, one end of the return pipeline is connected to the reducing agent tank, and a return pump arranged on the return pipeline; a pressure testing step, testing whether the pressure in the pressure pipeline is larger than the normal pressure, and entering a pressure maintaining step if the result of the pressure testing step is yes; if the result of the pressure testing step is 'no', entering a metering step; a pressure maintaining step, wherein the reducing agent is maintained in the return pipeline for a preset time and then enters a pressure building step; and a metering step, namely metering the reducing agent according to a preset mode. The problem that the pressure cannot be built quickly in the icing condition in the prior art can be solved.

Description

Method for metering an exhaust gas reducing agent and computer program product
Technical Field
The present application relates to the field of diesel engine exhaust gas treatment devices, and more particularly, to a method and computer program product for metering an exhaust gas reductant.
Background
To meet the requirements of environmental regulations, spontaneous combustionInternal combustion engines are often provided with an SCR catalyst in the exhaust system. The SCR catalyst is then able to remove NO contained in the exhaust gas x The compounds are converted into water and nitrogen, and an exhaust gas post-reducing agent, for example liquid aqueous urea solution used as a reducing agent, is injected into exhaust gas pipe upstream of the SCR catalyst . To achieve this, a metering device is introduced, which comprises a supply module which draws the reducing agent from the reducing agent tank and a metering module, similar to the injector of the fuel injection device, for injecting the reducing agent into the exhaust pipe. The supply module and the metering module control the metering action of the supply module and the metering module through the controller, the suction pump is arranged in the supply module, the suction pump has certain allowance when sucking the reducing agent, and redundant reducing agent flows back to the reducing agent tank through the return line under the action of the return pump after one-time injection is finished, so that the pressure is kept stable in a pressure line from the suction pump to the metering module.
A connecting pipe is provided between the supply module and the reducing agent tank and is mounted on the return line, and when the temperature is low because a part of the reducing agent remains in the connecting pipe after the internal combustion engine stops operating, the remaining reducing agent may freeze. The solid reducing agent in the connecting pipe may block the return passage of the reducing agent when the supply of the reducing agent is performed next time, so that a stable pressure cannot be formed on the pressure line, and the metering device for the reducing agent cannot start to operate when the stable pressure cannot be formed.
A method for rapidly solving the above problems is required.
Disclosure of Invention
The invention aims to provide a metering method for an exhaust gas reducing agent and a computer program product thereof.
In order to accomplish the above object, the present invention provides a method for measuring an exhaust gas reducing agent, which is used for a measuring device of the exhaust gas reducing agent, the measuring device comprises a supply module and a measuring module, the supply module is in liquid communication with a reducing agent tank through a suction pipeline and a return pipeline, the measuring device comprises a delivery pump for sucking the reducing agent, a pressure pipeline for connecting the measuring module and the delivery pump, a pressure sensor arranged on the pressure pipeline for measuring the pressure on the pressure pipeline, one end of the return pipeline is connected to the reducing agent tank, and a return pump arranged on the return pipeline, the method comprises the following steps,
a pressure building step, wherein the conveying pump builds pressure in a pressure pipeline;
a pressure testing step, testing whether the pressure in the pressure pipeline is larger than the normal pressure, and entering a pressure maintaining step if the result of the pressure testing step is yes; if the result of the pressure testing step is 'no', entering a metering step;
a pressure maintaining step, namely, the reducing agent is maintained in the return pipeline for a preset time and then enters a pressure building step;
and a metering step, namely metering the reducing agent according to a preset mode.
The invention further provides a computer program product which, when running, can carry out the method for metering an exhaust gas reducing agent as described above.
By using the technical scheme provided by the invention, the metering system of the waste gas reducing agent can be enabled to recover normal operation as soon as possible.
Drawings
Exemplary embodiments of the present application will be described in detail below with reference to the attached drawings, it being understood that the following description of the embodiments is only for the purpose of explanation and not limitation of the scope of the present application, and in the accompanying drawings:
FIG. 1 is a block diagram of a metering device that employs the method of metering an exhaust reductant of the present invention;
fig. 2 is a flow chart of the method for metering an exhaust gas reducing agent according to the invention.
Detailed Description
It should be understood that the drawings are for illustrative purposes only and are not intended to limit the application.
Fig. 1 is a block diagram of a metering device for metering an exhaust gas reducing agent according to the present invention. The metering device in the present embodiment is used in a diesel engine exhaust gas treatment system, which comprises a supply module and a metering module 5. As shown in the dashed line frame of the figure, the supply module is in fluid communication with the reducing agent tank 1 through the suction line 11 and the return line 13, sucks the reducing agent from the suction line 11, and returns the reducing agent from the return line 13 to the reducing agent tank 1. The supply module also comprises a delivery pump 3, one end of which is connected to a suction line 11, on which suction line 11 a pre-filter 2 is arranged. The delivery pump 3 also comprises, in the present embodiment, a non-return valve (not numbered) communicating with the metering module 5 through a pressure line 12, the main filter 16 and the pressure sensor 4 being arranged on the pressure line 12. The pressure sensor 4 may measure a real-time pressure value on the pressure line 12. A return line 13 is connected to the pressure line 12, and in the present embodiment, the return line 13 is provided downstream of the main filter 16, and the other end of the return line 13 is connected to the reducing agent line 1. The return line 13 is provided with a parallel liquid path, and a back suction pump 7 and a valve unit 6 are provided respectively. The valve unit 6 comprises a throttle valve and the suck back pump 7 comprises a reversing valve 10. At a point in the return line 13 downstream of the valve unit 6 and the suck-back pump 7, the fluid returns to the reducing agent tank 1 via the connecting line 9. An electric heating device (not shown) is provided in the reducing agent tank 1, and a heating device is not provided in the connection pipe 9. The metering device is controlled in its normal metering operation by a controller (not shown) and the metering method of the present invention is also controlled by a controller, typically the controller of a diesel engine exhaust gas treatment system, although any other controller configured to control the operation of the metering device is possible. In this embodiment, the reducing agent is an aqueous urea solution.
Under normal conditions, the suction pump 3 in the supply module sucks up reducing agent from the reducing agent tank 1, and under the control of the controller, the reducing agent sucked up by the supply module will be slightly more than the amount that needs to be injected by the dosing module 5 in order to maintain a sufficient pressure in the supply module. Excess reducing agent is returned to the reducing agent tank 1 via a throttle valve in the valve unit 6. After the metering operation is completed, the suck-back pump 7 attempts to completely empty the reducing agent in the supply module by the suck-back operation to prevent the residual reducing agent from freezing in a low temperature state. However, in practice, the reducing agent tends to remain in the connecting pipe 9 downstream of the suck-back pump 7, and the evacuation cannot be completed, so that the solid reducing agent tends to be formed in the connecting pipe 9. At the start of the next metering operation, no effective backflow can be established, resulting in an inability to establish a stable pressure within the supply module.
Please refer to fig. 2, which shows a flow chart of the method for metering the exhaust gas reductant according to the present invention. After the diesel engine system is started, firstly, a pressure building step S001 is performed, the delivery pump 3 sucks the reducing agent from the reducing agent tank 1 through the suction line 11, and tries to build pressure in the pressure line 12; then, in the pressure testing step S002, it is tested whether the pressure in the pressure pipeline 12 is greater than the normal pressure, the real-time pressure in the pressure pipeline 12 is obtained by the real-time testing of the pressure sensor 4 in this embodiment, and the value of the normal pressure is preset in the controller of the metering device in this embodiment, and is determined by comparing the measured value of the pressure sensor 4 with the value of the normal pressure, if the above-mentioned test result is "yes", the pressure maintaining step S003 is entered, and if the above-mentioned test result is "no", the metering step S004 is entered. In some other embodiments, the normal pressure value is represented by a pressure corresponding value that varies with the pressure buildup time, and the corresponding relationship is set in the controller, for example, the normal pressure value corresponding to 5 seconds after the pressure buildup is started, and the normal pressure value corresponding to 10 seconds after the pressure buildup is started. It is determined whether the pressure in the pressure line 12 is greater than the normal pressure by comparing the pressure value measured by the pressure sensor 4 at a specific pressure buildup time with a preset pressure value at the specific time. The normal pressure value or pressure curve described above may be calculated or may be obtained by practice. In the pressure holding step S003, the reducing agent is held in the return line 13, so that the liquid reducing agent flushes or heats the solid reducing agent in the return line 13, in particular the solid reducing agent in the connection pipe 9. Of course, if the reducing agent in the reducing agent tank 1 is frozen after the diesel engine is started, the reducing agent tank 1 can be heated to a liquid state by the electric heating device and then the pressure building can be started. After the reducing agent is maintained in the return line 13 for a predetermined time, the process proceeds to the pressure buildup step S001, pressure buildup is attempted again, the process proceeds to the pressure test step S002, if the pressure buildup can smoothly reach the normal pressure, the process proceeds to the metering step S004, otherwise, the process proceeds to the pressure maintenance step S003 again in a cycle. The pressure holding step S003 can be performed by the suction pump 3 or by the suck-back pump 7. Of course, during actual operation, it is possible that the solid reducing agent in the connecting pipe 9 does not completely block the return flow of the reducing agent, and the amount of the return flow of the reducing agent gradually increases as the solid reducing agent melts. In other embodiments, the normal pressure value may be represented as an accurate pressure value, or may be represented as a pressure interval.
In some other embodiments, for example, in the pressure testing step S002, if the test result is "no", before the metering step S004, a step of determining whether the pressure in the pressure line is significantly lower than the normal pressure is further provided, if the pressure in the pressure line is not significantly lower than the normal pressure, the metering step S004 is performed, and if the pressure in the pressure line is significantly lower than the normal pressure, the supply module searches for a reason under the control of the controller and corrects the reason, which is not described herein again.
The invention also comprises a computer program product which, when run, implements the metering method of the invention, the computer program product being stored in the controller.
By means of the metering method and the computer program product according to the invention, it is possible to heat the solid reducing agent remaining in the return line, in particular the connecting line, which does not have a heating device, by means of the already liquid reducing agent, and to operate the metering device more quickly.

Claims (10)

1. A metering method of an exhaust gas reducing agent is used for a metering device of the exhaust gas reducing agent, the metering device comprises a supply module and a metering module (5), the supply module is in liquid communication with a reducing agent tank (1) through an absorption pipeline (11) and a return pipeline (13), the metering device comprises a delivery pump (3) for absorbing the reducing agent, a pressure pipeline (12) for connecting the metering module (5) and the delivery pump (3), a pressure sensor (4) arranged on the pressure pipeline (12) and used for measuring the pressure on the pressure pipeline, one end of the return pipeline (13) is connected to the pressure pipeline (12), one end of the return pipeline (13) is connected to the reducing agent tank (1), and a return pump (7) arranged on the return pipeline (13) comprises the following steps,
a pressure build-up step, in which the delivery pump (3) builds up a pressure in a pressure line (12);
a pressure test step of testing whether the pressure in the pressure line (12) is greater than a normal pressure, and if the result of the pressure test step is yes, entering a pressure maintaining step; if the result of the pressure testing step is 'no', entering a metering step;
a pressure maintaining step of maintaining the reducing agent in the return line (13) for a predetermined time and then entering a pressure building step;
and a metering step, namely metering the reducing agent according to a preset mode.
2. The method of metering an exhaust-gas reducing agent according to claim 1, wherein the reducing agent is sucked from the reducing agent tank (1) by the delivery pump (3) and pressure is built up in a pressure line (12).
3. The method of metering an exhaust gas reducing agent according to claim 2, wherein a normal pressure in the pressure line (12) is preset in a controller of a metering device, and it is determined whether the pressure in the pressure line (12) is greater than the normal pressure by comparing a pressure value measured by the pressure sensor (4) with the preset pressure value.
4. The method of metering an exhaust gas reducing agent according to claim 2, wherein the corresponding value of the normal pressure in the pressure line (12) over the pressure build-up time is preset in a controller of the metering device, and it is determined whether the pressure in the pressure line (12) is greater than the normal pressure by comparing the pressure value measured by the pressure sensor (4) at a specific pressure build-up time with a preset pressure value at that specific time.
5. The method of metering an exhaust gas reducing agent according to claim 3 or 4, wherein if the result of the pressure test step is "no", there is further a step of judging whether the pressure in the pressure line is less than a normal pressure before the metering step is performed, and if not, the metering step is entered.
6. A method of dosing an exhaust gas reducing agent according to any of claims 1 to 4, wherein a valve unit (6) is provided in parallel with the suck-back pump (7) on the return line (13).
7. A method of dosing an exhaust gas reducing agent according to any of claims 1 to 4, wherein a pre-filter (2) is provided on the suction line (11), a main filter (8) is provided on the pressure line (12), and the suck-back pump (7) comprises a reversing valve (10).
8. The method of metering an exhaust gas reducing agent according to any one of claims 1 to 4, wherein a connecting pipe (9) is provided on a return line (13) between the suck-back pump (7) and the reducing agent tank (1), the connecting pipe (9) having no heating device, and a heating device being provided in the reducing agent tank (1).
9. The method of metering an exhaust gas reducing agent according to any one of claims 1 to 4, wherein the reducing agent is an aqueous urea solution, and the metering device is used for a diesel engine.
10. A computer program product which is operable to implement the method of dosing an exhaust gas reductant according to any one of claims 1 to 9.
CN202110191312.5A 2021-02-19 2021-02-19 Method for metering an exhaust gas reducing agent and computer program product Pending CN114961946A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110191312.5A CN114961946A (en) 2021-02-19 2021-02-19 Method for metering an exhaust gas reducing agent and computer program product

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110191312.5A CN114961946A (en) 2021-02-19 2021-02-19 Method for metering an exhaust gas reducing agent and computer program product

Publications (1)

Publication Number Publication Date
CN114961946A true CN114961946A (en) 2022-08-30

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Application Number Title Priority Date Filing Date
CN202110191312.5A Pending CN114961946A (en) 2021-02-19 2021-02-19 Method for metering an exhaust gas reducing agent and computer program product

Country Status (1)

Country Link
CN (1) CN114961946A (en)

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