CN114046198B - Double DPF regeneration control method and device and engine - Google Patents

Double DPF regeneration control method and device and engine Download PDF

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Publication number
CN114046198B
CN114046198B CN202210026429.2A CN202210026429A CN114046198B CN 114046198 B CN114046198 B CN 114046198B CN 202210026429 A CN202210026429 A CN 202210026429A CN 114046198 B CN114046198 B CN 114046198B
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dpf
temperature
upstream
determining
upstream temperature
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CN114046198A (en
Inventor
王志坚
王国栋
杜祥宁
傅晓磊
张勇
李钊
谭治学
王秀雷
褚国良
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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Priority to PCT/CN2023/071639 priority patent/WO2023134683A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
    • 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
    • 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
    • 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
    • F01N2900/1606—Particle filter loading or soot amount
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

The invention discloses a double DPF regeneration control method, a device and an engine, wherein the method is applied to an engine aftertreatment system comprising double DPFs and comprises the following steps: determining a DPF upstream temperature based on an upstream temperature sensor of another DPF when each DPF is detected to be in an active regeneration mode and an upstream temperature sensor of one of the DPFs reports a plausibility failure, and determining a regeneration peak temperature and a maximum temperature gradient in each DPF based on a plurality of internal temperature sensors in each DPF; determining a set value of the DPF upstream temperature according to the exhaust gas mass flow, the DOC upstream temperature, the SCR upstream temperature and the carbon loading; determining a set value of the maximum temperature gradient according to the HC aging factor, the DOC downstream temperature and the SCR upstream temperature; during the DPF active regeneration process, the regeneration peak temperature is controlled according to the set value of the DPF upstream temperature, and the maximum temperature gradient is controlled according to the set value of the maximum temperature gradient, so that the reliability of the double DPF during regeneration is improved.

Description

Double DPF regeneration control method and device and engine
Technical Field
The application relates to the technical field of automobile control, in particular to a double DPF regeneration control method, a double DPF regeneration control device and an engine.
Background
One DOC (Diesel Oxidation catalyst) + DPF (Diesel particulate filter) is added in the aftertreatment, and two DOCs and two DPFs are arranged in parallel. The DPF upstream temperature sensor is added, so that the exhaust back pressure of the engine can be reduced, the thermal efficiency of the engine is improved, the oil consumption is saved, and the use cost is reduced.
When one of the sensors is detected, a failure of the credibility of the temperature sensor at the upstream of the DPF is reported. When the measured value of another DPF upstream temperature sensor is used for regeneration temperature control, the high temperature peak value possibly occurring in the DPF can cause the damage conditions of burning crack, burning and the like of the carrier.
How to improve the reliability of the double DPF during regeneration is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a double DPF regeneration control method, which is used for solving the technical problem that in the prior art, the reliability of double DPF regeneration is poor. The method is applied to an engine aftertreatment system comprising double DPFs, and comprises the following steps:
determining a DPF upstream temperature based on an upstream temperature sensor of another DPF when each DPF is detected to be in an active regeneration mode and an upstream temperature sensor of one of the DPFs reports a plausibility failure, and determining a regeneration peak temperature and a maximum temperature gradient in each DPF based on a plurality of internal temperature sensors in each DPF;
determining a set value of the DPF upstream temperature according to the exhaust gas mass flow, the DOC upstream temperature, the SCR upstream temperature and the carbon loading;
determining a set value of the maximum temperature gradient according to the HC aging factor, the DOC downstream temperature and the SCR upstream temperature;
during active regeneration of the DPF, the regeneration peak temperature is controlled based on a set point for the temperature upstream of the DPF, and the maximum temperature gradient is controlled based on a set point for the maximum temperature gradient.
In some embodiments of the present application, the set point for the DPF upstream temperature is determined from the exhaust gas mass flow, DOC upstream temperature, SCR upstream temperature and carbon loading, specifically:
obtaining a set basic value of DPF upstream temperature according to the exhaust mass flow and a DOC upstream temperature lookup table;
and correcting the set basic value of the DPF upstream temperature according to different SCR upstream temperatures and carbon loads, and determining the set value of the DPF upstream temperature.
In some embodiments of the present application, the set point for the maximum temperature gradient is determined from the HC aging factor, the DOC downstream temperature, and the SCR upstream temperature, specifically:
determining a set basic value of the maximum temperature gradient according to the HC aging factor and a DOC downstream temperature lookup table;
and determining the set value of the maximum temperature gradient after correcting the set basic value of the maximum temperature gradient according to different SCR upstream temperatures.
In some embodiments of the present application, each of the internal temperature sensors is evenly distributed in the DPF in both an axial direction and a radial direction.
Correspondingly, the invention also provides a double DPF regeneration control device, which is applied to an engine aftertreatment system comprising a double DPF, and the device comprises:
a first determination module for determining an upstream temperature of one of the DPFs based on an upstream temperature sensor of the other DPF when the DPFs are detected to be in an active regeneration mode and the upstream temperature sensor of the other DPF reports a plausibility failure, and determining a regeneration peak temperature and a maximum temperature gradient in each of the DPFs based on a plurality of internal temperature sensors in each of the DPFs;
the second determination module is used for determining a set value of the DPF upstream temperature according to the exhaust gas mass flow, the DOC upstream temperature, the SCR upstream temperature and the carbon loading amount;
the third determining module is used for determining a set value of the maximum temperature gradient according to the HC aging factor, the DOC downstream temperature and the SCR upstream temperature;
a control module that controls a regeneration peak temperature based on a set point for a DPF upstream temperature and a maximum temperature gradient based on a set point for the maximum temperature gradient during an active regeneration of the DPF.
In some embodiments of the present application, the second determining module is specifically configured to:
obtaining a set basic value of DPF upstream temperature according to the exhaust mass flow and a DOC upstream temperature lookup table;
and correcting the set basic value of the DPF upstream temperature according to different SCR upstream temperatures and carbon loads, and determining the set value of the DPF upstream temperature.
In some embodiments of the present application, the third determining module is specifically configured to:
determining a set basic value of the maximum temperature gradient according to the HC aging factor and a DOC downstream temperature lookup table;
and determining the set value of the maximum temperature gradient after correcting the set basic value of the maximum temperature gradient according to different SCR upstream temperatures.
In some embodiments of the present application, each of the internal temperature sensors is evenly distributed in the DPF in both an axial direction and a radial direction.
Correspondingly, the invention also provides an engine comprising the double DPF regeneration control device.
By applying the above technical solution, in an engine aftertreatment system including dual DPFs, when it is detected that each DPF is in an active regeneration mode and an upstream temperature sensor of one of the DPFs reports a plausibility failure, determining a DPF upstream temperature based on an upstream temperature sensor of the other DPF, and determining a regeneration peak temperature and a maximum temperature gradient in each DPF based on a plurality of internal temperature sensors in each DPF; determining a set value of the DPF upstream temperature according to the exhaust gas mass flow, the DOC upstream temperature, the SCR upstream temperature and the carbon loading; determining a set value of the maximum temperature gradient according to the HC aging factor, the DOC downstream temperature and the SCR upstream temperature; during the DPF active regeneration process, the regeneration peak temperature is controlled according to the set value of the DPF upstream temperature, and the maximum temperature gradient is controlled according to the set value of the maximum temperature gradient, so that the reliability of the double DPF during regeneration is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 shows a schematic flow diagram of a dual DPF regeneration control method according to an embodiment of the present invention;
FIG. 2 shows an engine aftertreatment system layout according to an embodiment of the invention;
FIG. 3 shows a schematic diagram of the internal temperature sensor arrangement of each DPF in an embodiment of the present invention;
FIG. 4 illustrates a logic diagram for a DPF regeneration control method based on different SCR upstream temperature modifications in an embodiment of the present invention;
fig. 5 is a schematic structural diagram illustrating a dual DPF regeneration control apparatus according to an embodiment of the present invention.
In FIG. 2, 10, NOXA sensor; 20. HC injection; 30. a temperature sensor; 40. a differential pressure sensor; 50. urea injection; 60. a PM sensor.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a double-DPF regeneration control method, which is applied to an engine aftertreatment system comprising double DPFs, and when one of the double DPFs is detected, a credibility fault of a temperature sensor at the upstream of the DPF is reported. When the measured value of another DPF upstream temperature sensor is used for regeneration temperature control, the pre-DPF set temperature and the maximum temperature gradient in the regeneration process are controlled and corrected based on different SCR upstream temperatures.
As shown in fig. 1, the method comprises the steps of:
step S101, when detecting that each DPF is in an active regeneration mode and an upstream temperature sensor of one DPF reports a plausibility failure, determining a DPF upstream temperature based on an upstream temperature sensor of the other DPF, and determining a regeneration peak temperature and a maximum temperature gradient in each DPF based on a plurality of internal temperature sensors in each DPF.
In this embodiment, the engine aftertreatment system with two DPFs includes two DOC + DPFs arranged in parallel, and each DPF is provided with an upstream temperature sensor and a plurality of internal temperature sensors.
The DPFs enter an active regeneration mode based on an active regeneration request, when each DPF is detected to be in the active regeneration mode and an upstream temperature sensor of one of the DPFs reports a plausibility failure, in order to ensure reliability of performing active regeneration, an upstream temperature of the DPF is determined based on an upstream temperature sensor of the other DPF, and a regeneration peak temperature and a maximum temperature gradient in each DPF are determined based on a plurality of internal temperature sensors in each DPF, the maximum temperature gradient being a maximum rate of rise of a set value of the upstream temperature of the DPF.
In order to more accurately determine the temperature distribution in each DPF, in some embodiments of the present application, each of the internal temperature sensors is uniformly distributed in the DPF in both the axial and radial directions.
In a specific application scenario of the present application, fig. 3 is a schematic diagram illustrating an arrangement of internal temperature sensors of each DPF.
Those skilled in the art can select other internal sensor arrangements according to actual needs, which does not affect the protection scope of the present application.
Step S102, determining a set value of DPF upstream temperature according to the exhaust gas mass flow, DOC upstream temperature, SCR upstream temperature and carbon loading.
In this embodiment, the mass flow of exhaust gas can be obtained through a flowmeter, the temperature of the upstream of the DOC can be obtained through a temperature sensor arranged at the upstream of the DOC, the temperature of the upstream of the SCR (Selective Catalytic Reduction) can be obtained through a temperature sensor arranged at the upstream of the SCR, and the carbon loading can be calculated based on a carbon loading model. The set point for the DPF upstream temperature can be determined from the exhaust mass flow, DOC upstream temperature, SCR upstream temperature and carbon loading, which can ensure that the regeneration peak temperature of the DPF internal temperature does not exceed a safe temperature.
In order to accurately determine the set point for the DPF upstream temperature, in some embodiments of the present application, the set point for the DPF upstream temperature is determined based on the exhaust gas mass flow, DOC upstream temperature, SCR upstream temperature, and carbon loading, specifically:
obtaining a set basic value of DPF upstream temperature according to the exhaust mass flow and a DOC upstream temperature lookup table;
and correcting the set basic value of the DPF upstream temperature according to different SCR upstream temperatures and carbon loads, and determining the set value of the DPF upstream temperature.
In this embodiment, a table (may be a MAP table) is looked up according to the exhaust gas mass flow and the DOC upstream temperature to obtain a set base value of the DPF upstream temperature, and then the set base value of the DPF upstream temperature is corrected according to different SCR upstream temperatures and carbon loadings to obtain a set value of the DPF upstream temperature.
The set baseline of DPF upstream temperature may be modified based on a first predetermined correspondence between different SCR upstream temperatures and carbon loadings and the set baseline of DPF upstream temperature.
The specific process of looking up the table to obtain the base value of the set value based on the exhaust gas mass flow and the DOC upstream temperature is the prior art and is not described herein again.
It should be noted that the above embodiment is only one specific implementation solution proposed in the present application, and other ways of determining the set value of the DPF upstream temperature according to the exhaust gas mass flow, the DOC upstream temperature, the SCR upstream temperature, and the carbon loading all belong to the protection scope of the present application.
And step S103, determining a set value of the maximum temperature gradient according to the HC aging factor, the DOC downstream temperature and the SCR upstream temperature.
In this embodiment, the temperature downstream of the DOC can be obtained by a temperature sensor arranged downstream of the DOC, the temperature upstream of the SCR can be obtained by a temperature sensor arranged upstream of the SCR, and the process of obtaining the HC aging factor is the prior art and is not described herein again. The set point for the maximum temperature gradient can be determined from the HC aging factor, the DOC downstream temperature and the SCR upstream temperature
In order to accurately determine the set point of the maximum temperature gradient, in some embodiments of the present application, the set point of the maximum temperature gradient is determined according to the HC aging factor, the DOC downstream temperature, and the SCR upstream temperature, specifically:
determining a set basic value of the maximum temperature gradient according to the HC aging factor and a DOC downstream temperature lookup table;
and determining the set value of the maximum temperature gradient after correcting the set basic value of the maximum temperature gradient according to different SCR upstream temperatures.
In this embodiment, the set base value of the maximum temperature gradient is determined according to the HC aging factor and the DOC downstream temperature lookup table (which may be a MAP table), and then the set base value of the maximum temperature gradient is corrected according to different SCR upstream temperatures, so as to obtain the set value of the maximum temperature gradient after correction.
The set base value of the maximum temperature gradient may be modified according to a second predetermined correspondence of different SCR upstream temperatures and the set base value of the maximum temperature gradient.
The specific process of obtaining the set base value of the maximum temperature gradient by looking up the table according to the HC aging factor and the DOC downstream temperature is the prior art, and is not described herein again.
It should be noted that the scheme of the above embodiment is only one specific implementation scheme proposed by the present application, and other ways of determining the set value of the maximum temperature gradient according to the HC aging factor, the DOC downstream temperature and the SCR upstream temperature all belong to the protection scope of the present application.
Step S104, during the DPF active regeneration process, controlling the regeneration peak temperature according to the set value of the DPF upstream temperature, and controlling the maximum temperature gradient according to the set value of the maximum temperature gradient.
By applying the above technical solution, in an engine aftertreatment system including dual DPFs, when it is detected that each DPF is in an active regeneration mode and an upstream temperature sensor of one of the DPFs reports a plausibility failure, determining a DPF upstream temperature based on an upstream temperature sensor of the other DPF, and determining a regeneration peak temperature and a maximum temperature gradient in each DPF based on a plurality of internal temperature sensors in each DPF; determining a set value of the DPF upstream temperature according to the exhaust gas mass flow, the DOC upstream temperature, the SCR upstream temperature and the carbon loading; determining a set value of the maximum temperature gradient according to the HC aging factor, the DOC downstream temperature and the SCR upstream temperature; during the DPF active regeneration process, the regeneration peak temperature is controlled according to the set value of the DPF upstream temperature, and the maximum temperature gradient is controlled according to the set value of the maximum temperature gradient, so that the reliability of the double DPF during regeneration is improved.
In order to further illustrate the technical idea of the present invention, the technical solution of the present invention will now be described with reference to specific application scenarios.
Referring to fig. 2, which is a layout diagram of an engine aftertreatment system according to an embodiment of the invention, exhaust gas after TC (turbo charger) is discharged after HC injection 20, two DOC + DPF, urea injection 50, two SCR + ASC (Ammonia Slip Catalyst, Ammonia oxidation Catalyst). A temperature sensor 30 is provided upstream of each DPF, and NO is provided in an exhaust pipe upstream of the DOCXA sensor 10 and a temperature sensor 30, a differential pressure sensor 40 is provided in each DPF, the temperature sensor 30 is provided in the exhaust line upstream of the SCR, and NO is provided in the exhaust line downstream of the ASCXSensor 10, temperature sensor 30, and PM sensor 60.
The embodiment of the application provides a double DPF regeneration control method, which comprises the following specific processes:
assuming that one temperature sensor reports the credibility failure of the DPF upstream temperature sensor (1), the measured value of the other DPF upstream temperature sensor (2) is used for regeneration temperature control, and then the internal temperature measurement of the DPF (1) (2) is carried out in the active regeneration process. And obtaining the regeneration peak temperature and the maximum temperature gradient in the whole active regeneration process under different SCR upstream temperature conditions.
As shown in fig. 4, a logic diagram of a DPF regeneration control method based on different SCR upstream temperature corrections is shown, wherein a set basic value of the DPF upstream temperature is obtained according to the exhaust gas mass flow and DOC upstream temperature lookup table, different SCR upstream temperatures and carbon load are added, and the set basic value of the DPF upstream temperature is corrected to obtain a set value of the DPF upstream temperature.
And determining a set basic value of the maximum temperature gradient according to the HC aging factor and the DOC downstream temperature lookup table, and increasing different SCR upstream temperatures to correct the set basic value of the maximum temperature gradient to obtain a set value of the maximum temperature gradient.
Finally, during active regeneration of the DPF, the regeneration peak temperature is controlled according to a set point for DPF upstream temperature, and the maximum temperature gradient is controlled according to a set point for the maximum temperature gradient.
According to the scheme, the pre-DPF set temperature and the maximum temperature gradient in the regeneration process are controlled and corrected according to the SCR upstream temperature and the DPF internal temperature, the temperature control in the DPF regeneration process is safer in actual environment use, and the use reliability of the DPF can be effectively improved.
An embodiment of the present application further provides a dual DPF regeneration control apparatus applied to an engine aftertreatment system including a dual DPF, as shown in fig. 5, the apparatus including:
a first determining module 501 for determining an upstream temperature of one of the DPFs based on an upstream temperature sensor of the other DPF when it is detected that the DPFs are in an active regeneration mode and the upstream temperature sensor of the DPF reports a plausibility failure, and determining a regeneration peak temperature and a maximum temperature gradient in each of the DPFs based on a plurality of internal temperature sensors in each of the DPFs;
a second determination module 502 for determining a set point for DPF upstream temperature based on exhaust mass flow, DOC upstream temperature, SCR upstream temperature, and carbon loading;
a third determination module 503 for determining a set point for a maximum temperature gradient based on the HC aging factor, the DOC downstream temperature, and the SCR upstream temperature;
the control module 504 controls a regeneration peak temperature based on a set point for a temperature upstream of the DPF during active regeneration of the DPF and controls a maximum temperature gradient based on a set point for the maximum temperature gradient.
In a specific application scenario of the present application, the second determining module 502 is specifically configured to:
obtaining a set basic value of DPF upstream temperature according to the exhaust mass flow and a DOC upstream temperature lookup table;
and correcting the set basic value of the DPF upstream temperature according to different SCR upstream temperatures and carbon loads, and determining the set value of the DPF upstream temperature.
In a specific application scenario of the present application, the third determining module 503 is specifically configured to:
determining a set basic value of the maximum temperature gradient according to the HC aging factor and a DOC downstream temperature lookup table;
and determining the set value of the maximum temperature gradient after correcting the set basic value of the maximum temperature gradient according to different SCR upstream temperatures.
In a specific application scenario of the present application, each of the internal temperature sensors is uniformly distributed in the DPF in an axial direction and a radial direction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (9)

1. A dual DPF regeneration control method for use in an engine aftertreatment system including a dual DPF, the method comprising:
determining a DPF upstream temperature based on an upstream temperature sensor of another DPF when each DPF is detected to be in an active regeneration mode and an upstream temperature sensor of one of the DPFs reports a plausibility failure, and determining a regeneration peak temperature and a maximum temperature gradient in each DPF based on a plurality of internal temperature sensors in each DPF;
determining a set value of the DPF upstream temperature according to the exhaust gas mass flow, the DOC upstream temperature, the SCR upstream temperature and the carbon loading;
determining a set value of the maximum temperature gradient according to the HC aging factor, the DOC downstream temperature and the SCR upstream temperature;
during active regeneration of the DPF, the regeneration peak temperature is controlled based on a set point for the temperature upstream of the DPF, and the maximum temperature gradient is controlled based on a set point for the maximum temperature gradient.
2. The method according to claim 1, characterized in that the set value for the DPF upstream temperature is determined from the exhaust gas mass flow, the DOC upstream temperature, the SCR upstream temperature and the carbon loading, in particular:
obtaining a set basic value of DPF upstream temperature according to the exhaust mass flow and a DOC upstream temperature lookup table;
and correcting the set basic value of the DPF upstream temperature according to different SCR upstream temperatures and carbon loads, and determining the set value of the DPF upstream temperature.
3. Method according to claim 1, characterized in that the setpoint for the maximum temperature gradient is determined on the basis of the HC aging factor, the DOC downstream temperature and the SCR upstream temperature, in particular:
determining a set basic value of the maximum temperature gradient according to the HC aging factor and a DOC downstream temperature lookup table;
and determining the set value of the maximum temperature gradient after correcting the set basic value of the maximum temperature gradient according to different SCR upstream temperatures.
4. The method of claim 1, wherein each of said internal temperature sensors is uniformly distributed in the DPF in both an axial direction and a radial direction.
5. A dual DPF regeneration control apparatus for use in an engine aftertreatment system including a dual DPF, the apparatus comprising:
a first determination module for determining an upstream temperature of one of the DPFs based on an upstream temperature sensor of the other DPF when the DPFs are detected to be in an active regeneration mode and the upstream temperature sensor of the other DPF reports a plausibility failure, and determining a regeneration peak temperature and a maximum temperature gradient in each of the DPFs based on a plurality of internal temperature sensors in each of the DPFs;
the second determination module is used for determining a set value of the DPF upstream temperature according to the exhaust gas mass flow, the DOC upstream temperature, the SCR upstream temperature and the carbon loading amount;
the third determining module is used for determining a set value of the maximum temperature gradient according to the HC aging factor, the DOC downstream temperature and the SCR upstream temperature;
a control module that controls a regeneration peak temperature based on a set point for a DPF upstream temperature and a maximum temperature gradient based on a set point for the maximum temperature gradient during an active regeneration of the DPF.
6. The apparatus of claim 5, wherein the second determining module is specifically configured to:
obtaining a set basic value of DPF upstream temperature according to the exhaust mass flow and a DOC upstream temperature lookup table;
and correcting the set basic value of the DPF upstream temperature according to different SCR upstream temperatures and carbon loads, and determining the set value of the DPF upstream temperature.
7. The apparatus of claim 5, wherein the third determining module is specifically configured to:
determining a set basic value of the maximum temperature gradient according to the HC aging factor and a DOC downstream temperature lookup table;
and determining the set value of the maximum temperature gradient after correcting the set basic value of the maximum temperature gradient according to different SCR upstream temperatures.
8. The apparatus of claim 5, wherein each of said internal temperature sensors is evenly distributed in the DPF in both an axial direction and a radial direction.
9. An engine characterized by comprising a dual DPF regeneration control apparatus according to any one of claims 5 to 8.
CN202210026429.2A 2022-01-11 2022-01-11 Double DPF regeneration control method and device and engine Active CN114046198B (en)

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PCT/CN2023/071639 WO2023134683A1 (en) 2022-01-11 2023-01-10 Double-dpf regeneration control method and apparatus, and engine

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