CN113236402B - Device and method for controlling DPF carbon-supported trapping and passive regeneration - Google Patents

Device and method for controlling DPF carbon-supported trapping and passive regeneration Download PDF

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CN113236402B
CN113236402B CN202110659182.3A CN202110659182A CN113236402B CN 113236402 B CN113236402 B CN 113236402B CN 202110659182 A CN202110659182 A CN 202110659182A CN 113236402 B CN113236402 B CN 113236402B
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dpf
pipelines
carrier
carbon
exhaust gas
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CN113236402A (en
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卢丰翥
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Wuxi Weifu Lida Catalytic Converter Co Ltd
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Wuxi Weifu Lida Catalytic Converter Co Ltd
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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
    • 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
    • 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
    • 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
    • F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/011—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
    • 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
    • F01N3/027—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 electric or magnetic heating means
    • 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

The invention discloses a device and a method for controlling DPF carbon loading trapping and passive regeneration, wherein the device comprises an NOx sensor, a DPF parallel assembly and a temperature sensor, the NOx sensor is positioned on an upstream pipeline of the DPF parallel assembly, and the temperature sensor is positioned on a downstream pipeline of the DPF parallel assembly; the DPF parallel connection assembly comprises at least two groups of DPF pipelines which are arranged in parallel, each DPF pipeline comprises a DPF carrier, an air flow meter, a one-way valve, a differential pressure sensor and a resistance wire, and the resistance wire is located at the front end of each DPF carrier. And through comparing each real-time measured value with the threshold value set by the system, the check valve is controlled to switch the flow of the waste gas between the DPF carriers, and the resistance wire is controlled to start/stop heating. According to the carbon loading amount in each DPF, the flow of waste gas among different DPFs is switched by using the one-way valve, and the DPF is actively regenerated by using the resistance wire, so that the temperature controllability is high, the temperature rises quickly, and the over-temperature phenomenon is less.

Description

Device and method for controlling DPF carbon-supported trapping and passive regeneration
Technical Field
The invention belongs to the technical field, and particularly relates to a device and a method for controlling DPF carbon-supported trapping and passive regeneration.
Background
The emission standard of automobile exhaust is more and more strict, especially with the implementation of the national six-emission regulation of light vehicles, no matter the diesel engine and the gasoline engine, the requirement for particulate matters in the national six-emission regulation is more strict than that of the national five-emission regulation (the gasoline engine is more than 30 percent stricter), and the particulate matters are required to be filtered to meet the emission regulation requirement.
At present, the mainstream technical scheme of the national six aftertreatment of the diesel engine is a diesel oxidation catalyst DOC + gasoline Particulate filter DPF + selective catalytic reduction SCR route, wherein a main function of the DPF (diesel Particulate filter) is to trap PM discharged by an engine, and when the PM amount in the DPF reaches the maximum limit value which can be borne by the DPF, the PM in the DPF can be removed by an active regeneration mode. Active regeneration is to burn fuel oil in DOC by means of in-cylinder post-injection technology to raise the outlet temperature of DOC to about 600 deg.c and to burn PM in DPF at high temperature to eliminate PM in DPF.
The disadvantages of this method consist of the following:
1. the fuel is combusted in the DOC, the temperature is high, and if the control is not reasonable or the engine suddenly fails, the internal structure of the DPF can be ablated to lose the capability of trapping PM;
during DPF regeneration, the surface temperature of the whole aftertreatment carrier is high, and wire harnesses and sensors arranged on the aftertreatment surface can be burnt or damaged;
3, in the DPF regeneration process, most of engines with small and medium displacement adopt an in-cylinder post-injection technology, so that engine oil of the engine is diluted, the viscosity of the engine oil is reduced, and the lubricating capability is reduced;
4, during the regeneration process of the DPF, the combustion of the engine is deteriorated, a large amount of pollutants are discharged into the atmosphere, and the environment is polluted.
Therefore, the regeneration process of DPF needs to be further improved.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a device and a method for controlling DPF carbon-supported trapping and passive regeneration, which realize temperature control, effectively promote active regeneration and are beneficial to DPF ash removal.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
one object of the present invention is to provide a device for controlling DPF carbon capture and passive regeneration, comprising a NOx sensor, a DPF parallel assembly and a temperature sensor, wherein the NOx sensor is located on an upstream pipeline of the DPF parallel assembly, and the temperature sensor is located on a downstream pipeline of the DPF parallel assembly;
the DPF parallel assembly comprises at least two groups of DPF pipelines which are arranged in parallel, each DPF pipeline comprises a DPF carrier, an air flow meter, a one-way valve, a differential pressure sensor and a resistance wire,
the resistance wire is positioned at the front end of each DPF carrier;
the two ends of the differential pressure sensor are respectively connected with the inlet end and the outlet end of the corresponding DPF carrier, the one-way valve is arranged on the upstream pipeline and the downstream pipeline of each DPF carrier, and the air flow meter is arranged on the pipeline positioned in front of the one-way valve of the upstream pipeline;
the device also comprises a control center, wherein the receiving end of the control center is connected with the NOx sensor, the air flow meter, the differential pressure sensor and the temperature sensor, and the output end of the control center is connected with the one-way valve and the resistance wire.
In one example, the resistance wire is located at the front end of the DPF carrier, and exhaust gas in a DPF pipeline is heated to 600-650 ℃ through the resistance wire and then enters the DPF carrier.
Another object of the present invention is to provide a control method for controlling a DPF carbon trap and passive regeneration device, which is applied to the control center, including:
receiving real-time measured values in response to exhaust gas entering the DPF parallel assembly, wherein the real-time measured values comprise NOx concentration collected by the NOx sensor, total exhaust gas oxygen concentration and one-way air mass flow collected by the air flow meter, one-way DPF differential pressure collected by the differential pressure sensor and total outflow gas temperature collected by the temperature sensor;
and comparing the real-time measurement value with a threshold value set by a system, and controlling the opening/closing of a one-way valve and a resistance wire based on a comparison result, wherein the opening/closing of the one-way valve is used for switching the flow of waste gas between different DPF carriers, and the opening/closing of the resistance wire is used for regulating and controlling the resistance wire to start/stop heating the DPF carriers.
In one example, the comparing the real-time measured value with a threshold value set by a system and controlling the opening/closing of the one-way valve and the resistance wire based on the comparison result comprises:
obtaining the corresponding single-path DPF carbon loading capacity according to the single-path air mass flow, the single-path DPF pressure difference and the carrier volume of the DPF carrier;
comparing the concentration of the NOx in the main path exhaust gas, the concentration of the oxygen in the main path exhaust gas and the carbon carrying capacity of the single-path DPF with a threshold value set by a system, controlling the opening/closing of each one-way valve based on the comparison result, and switching the flow of the exhaust gas among different DPF carriers;
and comparing the temperature of the gas flowing out of the main path and the carbon carrying capacity of the single-path DPF with a threshold value set by a system, controlling the opening/closing of each resistance wire based on a comparison result, and regulating and controlling the resistance wires to start/stop heating the DPF carrier.
In one example, the comparing the total exhaust gas NOx concentration and the one-way DPF carbon loading with the threshold value set by the system, and controlling the opening/closing of each check valve based on the comparison result, the switching the exhaust gas to flow between different DPF carriers comprises: comparing the concentration of the exhaust gas NOx in the main path with the threshold value of the concentration of the NOx and the carbon carrying capacity of the single-path DPFnWith a second DPF carbon loading threshold DPFmTo control the opening/closing of each check valve; wherein the DPFnThe loading of the DPF of the nth group of pipelines is represented, and n is 1.. i.. j.; DPFmThe loading capacity of the DPF carrier is 30% -50% of the full-loading carbon capacity.
Specifically, in one example, the comparison of the total exhaust gas NOx concentration to a NOx concentration threshold, single DPF carbon loading DPFnWith a second DPF carbon loading threshold DPFmAnd controlling opening/closing of each check valve includes:
when the total exhaust gas NOx concentration < the NOx concentration threshold,
(1) if DPFn≤DPFmAnd a DPFi≥DPFjIf the vehicle runs normally, the check valve on the ith group of pipelines is closed, and the check valve on the ith group of pipelines is opened;
(2) if DPFi≤DPFm＜DPFjIf the vehicle runs normally, the one-way valve on the jth group of pipelines is closed, and the one-way valve on the ith group of pipelines is opened;
(3) if DPFn＞DPFmAnd then the one-way valves on the n groups of pipelines are opened, and the vehicle runs normally.
Specifically, in one example, the comparison of the total exhaust gas NOx concentration to a NOx concentration threshold, single DPF carbon loading DPFnWith a second DPF carbon loading threshold DPFmAnd controlling opening/closing of each check valve further includes:
when the concentration of the main exhaust gas NOx is larger than or equal to the threshold value of the concentration of the NOx,
(i) if DPFn≤DPFmAnd a DPFi≥DPFjIf the vehicle runs normally, the one-way valve on the jth group of pipelines is closed, and the one-way valve on the ith group of pipelines is opened;
(ii) if DPFj≤DPFm＜DPFiIf the exhaust gas is subjected to the ash removal treatment through the DPF carrier of the ith group of pipelines, the check valve on the jth group of pipelines is closed, the check valve on the ith group of pipelines is opened, and the exhaust gas is subjected to the ash removal treatment through the DPF carrier of the ith group of pipelines;
(iii) if DPFn＞DPFmAnd then the one-way valves on the n groups of pipelines are opened, and the waste gas is subjected to ash removal treatment by the DPF carriers of the n groups of pipelines at the same time.
More specifically, in one example, the controlling the opening/closing of each resistance wire by comparing the temperature of the main outflow gas, the concentration of the main exhaust gas oxygen, the carbon loading of the single DPF with the magnitude of a threshold value set by a system, and the controlling the resistance wire to start/stop heating of the DPF includes:
in the case of the (i) th case, when the vehicle normally travels to the DPFi≥DPFmaxAnd T is less than or equal to TminHeating resistance wires on the ith group of pipelines, otherwise, stopping heating the resistance wires;
in the case of (ii) or (iii), DPFi≥DPFjAfter the ash removal treatment, if VOxygen gas≥VOxygen 0Closing the one-way valve on the ith group of pipelines, opening the one-way valve on the jth group of pipelines, and carrying out ash removal treatment on the DPF carrier of the jth group of pipelines until T is less than or equal to TmaxWhen the heating is finished, the resistance wires on the jth group of pipelines start to heat, otherwise, the resistance wires stop heating;
wherein the DPFmaxRepresenting a third DPF carbon loading threshold, DPFmax60% -70% of the full-load carbon loading of the DPF carrier;
t represents the real-time total gas temperature, TminRepresenting a first effluent gas temperature threshold, Tmin300-400 ℃;
Tmaxrepresenting a second effluent gas temperature threshold, Tmax600-650 ℃;
Voxygen gasRepresenting the concentration of exhaust gas oxygen, VOxygen 0Representing the main exhaust oxygen concentration threshold, V Oxygen 03 to 4 percent.
More specifically, in one example, when (ii) and (iii) are the case, the jth group of tubesThe DPF carrier of way still includes after carrying out the deashing treatment: when DPFj≤DPFminWhen the ash is removed, the ash removal is finished;
wherein the DPFminRepresenting a first DPF carbon loading threshold, DPFmin10% -15% of the full-load carbon load of the DPF carrier 6.
Has the advantages that: compared with the prior art, the device and the method for controlling the carbon-supported trapping and passive regeneration of the DPF provided by the invention have the following advantages:
(1) the carbon loading amount in the DPF carrier is cleared mainly by means of passive regeneration, the temperature in the DPF carrier is not high in the passive regeneration process, and the DPF carrier cannot be ablated due to high temperature and the like;
(2) the active and passive regeneration does not depend on the fuel post-injection technology, and does not dilute the engine oil;
(3) compared with the traditional active regeneration, the exhaust gas discharged by the engine in the active and passive regeneration process has less atmospheric pollution degree and better meets the requirement of environmental protection;
(4) the passive regeneration and active regeneration methods related by the invention have lower requirements on the working conditions of the engine, such as: in the active regeneration process of the traditional engine, if the engine idles for a long time and the whole vehicle runs down a slope (the engine drags backwards), the temperature before the DPF carrier drops seriously, and the active regeneration requirement can not be met (the temperature before the DPF carrier is required to be about 600 ℃ in general active regeneration). The active regeneration introduced by the invention supplies heat to the DPF carrier by means of resistance wire heating, and is not limited by the working condition of the engine.
(5) The DPF is actively regenerated by using the resistance wire, so that the temperature controllability is high, the temperature rises quickly, and the overtemperature phenomenon is less.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of a device for controlling DPF carbon loading trapping and passive regeneration according to an embodiment of the present invention;
FIG. 2 is a general schematic diagram of a control method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a control method in case 1) of the embodiment of the present invention;
FIG. 4 is a schematic diagram of a control method in case 2) of the embodiment of the present invention;
FIG. 5 is a schematic view of the control method in case 3) of the embodiment of the present invention;
FIG. 6 is a schematic view of the control method in case 4) of the embodiment of the present invention;
FIG. 7 is a schematic view of the control method in the cases 5) and 6) of the embodiment of the present invention;
in the figure, 1-NOx sensor, 2-air flow meter, 3-one-way valve, 4-resistance wire, 5-differential pressure sensor, 6-DPF carrier, 7-temperature sensor, 201-second air flow meter, 301-second one-way valve, 401-second resistance wire, 501-second differential pressure sensor and 601-second DPF carrier.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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 invention.
The invention is further illustrated by the following examples and figures. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation. The invention is further described with reference to the following figures and examples.
The embodiment of the invention provides a device for controlling the trapping of carbon load and the passive regeneration of a DPF, and the device is shown in figure 1, and comprises a NOx sensor 1, a DPF parallel assembly and a temperature sensor 7, wherein the NOx sensor 1 is positioned on an upstream pipeline of the DPF parallel assembly, and the temperature sensor 7 is positioned on a downstream pipeline of the DPF parallel assembly;
the DPF parallel assembly comprises at least two groups of DPF pipelines which are arranged in parallel, each DPF pipeline comprises a diesel particle filter DPF carrier 6, an air flow meter 2, a one-way valve 3 and a differential pressure sensor 5,
wherein each DPF carrier 6 is provided with a resistance wire 4;
two ends of the differential pressure sensor 5 are respectively connected with the inlet end and the outlet end of the corresponding DPF carrier 6, the check valve 3 is arranged on the upstream pipeline and the downstream pipeline of each DPF carrier 6, and the air flow meter 2 is arranged on the pipeline in front of the check valve 3 of the upstream pipeline;
the device also comprises a control center, wherein the receiving end of the control center is connected with the NOx sensor 1, the air flow meter 2, the differential pressure sensor 5 and the temperature sensor 7, and the output end of the control center is connected with the one-way valve 3 and the resistance wire 4.
Specifically, a signal receiving end of the control center is in signal connection with signal output ends of the NOx sensor 1, the air flow meter 2, the differential pressure sensor 5 and the temperature sensor 7, the NOx sensor 1, the air flow meter 2, the differential pressure sensor 5 and the temperature sensor 7 respectively and correspondingly test to obtain real-time values of the concentration of the exhaust gas NOx in the main path, the concentration of the exhaust gas oxygen in the main path, the air mass flow, the differential pressure of the DPF and the temperature of the outflow gas, convert the values into data signals, transmit the data signals to the control center, after receiving the data signals, the control center calculates through a computing system, determines the real-time test data and the threshold value set by the system, and controls the opening/closing of the check valve 3 according to the determination result.
In one example, the resistance wire 4 is located at the front end of the DPF carrier, and the airflow is heated to 600-650 ℃ through the resistance wire and then enters the DPF carrier. The resistance wire is connected with a control center, and the control center controls the resistance wire 4 to start/stop heating the DPF carrier 6. Because the pre-DPF-carrier temperature is 250 deg.C or more, more preferably 300 deg.C or more, and the pre-DPF-carrier NO is satisfied2When the concentration is a certain value, the passive regeneration is stronger, so that the front end of the DPF carrier needs to be heated by adopting a resistance wire, so that the front temperature of the DPF carrier reaches a set value quickly, and the generation of the passive regeneration is promoted.
The resistance wire sets up in the DPF front end for get into the waste gas of DPF and heat. On one hand, the resistance wire is easier to be installed at the front end of the DPFThe operation is easier; on the other hand, the resistance wire is installed at the DPF front end, and the temperature at the DPF entrance can satisfy the requirement of active regeneration for all waste gases that get into DPF can both satisfy the temperature of the requirement of active regeneration. The embodiment of the invention also provides a control method of the DPF carbon load trapping and passive regeneration device discussed in any one of the embodiments, and the control method can be used for clearing the carbon load in the DPF on the premise of mainly passive regeneration and secondarily actively active regeneration. Particularly, according to the carbon loading amount in each DPF, the flow of waste gas among different DPFs is switched by utilizing a one-way valve, and the waste gas is heated by matching with a front heating resistance wire of each DPF carrier, so that passive regeneration (NO) is depended on under most conditions2+C+O2→CO2+ NO) to reduce the carbon loading in the DPF; when the carbon loading in DPF reaches a certain value, active regeneration (C + O) can be used2→CO2) And carbon deposit in the DPF is quickly removed. It should be noted that the active regeneration discussed in the present application is different from the conventional active regeneration, and the active regeneration discussed in the present application refers to increasing the temperature of the DPF carrier by heating with a resistance wire, and has the advantages of high temperature controllability, fast temperature rise, and less occurrence of over-temperature phenomenon.
The control method is applied to the control center, and specifically comprises the following steps:
receiving real-time measured values in response to the exhaust gas entering the DPF parallel assembly, wherein the real-time measured values comprise NOx concentration collected by a NOx sensor 1, total exhaust gas oxygen concentration and one-way air mass flow collected by an air flow meter 2, one-way DPF differential pressure collected by a differential pressure sensor 5 and total outflow gas temperature collected by a temperature sensor 7;
and comparing the real-time measured value with a threshold value set by a system, and controlling the opening/closing of the check valve 3 and the resistance wire 4 based on the comparison result, wherein the opening/closing of the check valve 3 is used for switching the flow of the waste gas between the DPF carriers 6, and the opening/closing of the resistance wire 4 is used for regulating and controlling the start/stop heating of the DPF carriers 6 by the resistance wire 4.
Specifically, the NOx sensor 1 acquires the concentration of NOx in the inflow gas and the concentration of oxygen in the main exhaust gas, and the temperature sensor 7 acquires the temperature of the outflow gas; the differential pressure sensor 5 obtains the differential pressure at two ends of the DPF carrier, and the flow resistance of the DPF is calculated by combining the carrier volume of the DPF carrier, so that the carbon loading capacity of the DPF carrier is calculated. According to the real-time carbon loading amount in each DPF carrier 6, the one-way valve 3 is utilized to switch the flow of the exhaust gas between the DPF carriers 6, and the exhaust gas is heated by matching with a front resistance wire of each DPF carrier, so that the carbon loading amount in the DPF carriers 6 is reduced by means of passive regeneration under most conditions; when the carbon loading amount in the DPF carrier 6 reaches a certain value, the active regeneration can be utilized to quickly remove the carbon deposition in the DPF carrier 6.
In one example, comparing the real-time measured value with a threshold value set by a system, and controlling the opening/closing of the check valve 3 and the resistance wire 4 based on the comparison result comprises:
obtaining the corresponding single-path DPF carbon loading capacity according to the air mass flow of each single-path, the single-path DPF pressure difference and the carrier volume of the DPF carrier 6;
comparing the concentration of the NOx in the exhaust gas of the main path, the concentration of the oxygen in the exhaust gas of the main path and the carbon carrying capacity of the single-path DPF with a threshold value set by a system, controlling the opening/closing of each check valve 3 based on the comparison result, and switching the flow of the exhaust gas among different DPF carriers 6;
the temperature of the gas flowing out of the main path and the carbon carrying capacity of the single-path DPF are compared with a threshold value set by a system, the opening/closing of each resistance wire 4 is controlled based on the comparison result, and the resistance wires 4 are regulated and controlled to start/stop heating on the DPF carrier 6.
In one example, the above-mentioned controlling the opening/closing of each check valve 3 by comparing the total exhaust gas NOx concentration, the one-way DPF carbon loading and the magnitude of the threshold value set by the system, and switching the exhaust gas flow between different DPF carriers 6 includes: comparing the concentration of the exhaust gas NOx in the main path with the threshold value of the concentration of the NOx and the carbon carrying capacity of the single-path DPFnAnd a second DPF carrier carbon loading threshold value DPFmControls the opening/closing of each check valve 3, wherein DPFnThe loading of the DPF of the nth group of pipelines is represented, and n is 1.. i.. j.; DPFmIs 30-50% of the full-load carbon load of the DPF carrier 6.
Specifically, in one example, the total exhaust gas NOx concentration is compared to a NOx concentration threshold, single DPF carbon loading DPFnAnd a firstTwo DPF Carrier carbon Loading threshold DPFmAnd controlling the opening/closing of each check valve 3 includes:
first, the comparison between the total exhaust NOx concentration and the NOx concentration threshold is performed, and there are two cases:
in the first case, when the concentration of the exhaust gas NOx in the main path is less than the threshold value of the concentration of the NOx, the single-path DPF carbon loading DPF is carried outnAnd a second DPF carrier carbon loading threshold value DPFmThe size comparison of (2) is divided into the following three cases:
(1) if DPFn≤DPFmAnd a DPFi≥DPFjIf the vehicle runs normally, the check valve 3 on the ith group of pipelines is closed, the check valve 3 on the ith group of pipelines is opened, and the vehicle runs normally;
(2) if DPFi≤DPFm＜DPFjIf the vehicle runs normally, the check valve 3 on the jth group of pipelines is closed, and the check valve 3 on the ith group of pipelines is opened;
(3) if DPFn＞DPFmAnd then the check valves 3 on the n groups of pipelines are all opened, and the vehicle runs normally.
In the second case, when the concentration of the NOx in the exhaust gas of the main road is more than or equal to the threshold value of the concentration of the NOx, the single-road DPF carbon loading amount DPF is carried outnAnd a second DPF carrier carbon loading threshold value DPFmThe comparison of the sizes of the three parts is also divided into the following three cases:
(i) if DPFn≤DPFmAnd a DPFi≥DPFjIf so, closing the check valve (3) on the jth group of pipelines, opening the check valve (3) on the ith group of pipelines, and enabling the vehicle to normally run;
(ii) if DPFj≤DPFm＜DPFiIf the exhaust gas is subjected to the soot cleaning treatment through the DPF carrier of the ith group of pipelines, the check valve 3 on the jth group of pipelines is closed, the check valve 3 on the ith group of pipelines is opened, and the exhaust gas is subjected to the soot cleaning treatment through the DPF carrier of the ith group of pipelines;
(iii) if DPFn＞DPFmThen, the check valves 3 on the n groups of pipelines are opened, and the exhaust gas is subjected to ash removal treatment simultaneously through the DPF carriers of the n groups of pipelines.
On the other hand, in one example, comparing the main exhaust gas temperature, the main exhaust gas oxygen concentration and the single DPF carbon loading with the threshold value set by the system, and controlling the opening/closing of each resistance wire 4 based on the comparison result, the controlling of the resistance wires 4 to start/stop heating of the DPF carrier 6 includes:
in the case of the (i) th case, when the vehicle normally travels to the DPFi≥DPFmaxAnd T is less than or equal to TminHeating the resistance wires (4) on the ith group of pipelines, otherwise, stopping heating the resistance wires (4);
in the case of (ii) or (iii), DPFi≥DPFjAfter ash removal treatment, if VOxygen gas≥VOxygen 0Closing the one-way valve (3) on the ith group of pipelines, opening the one-way valve (3) on the jth group of pipelines, and performing ash removal treatment on the DPF of the jth group of pipelines until T is less than or equal to TmaxWhen the heating is finished, the resistance wires 4 on the jth group of pipelines start to be heated, otherwise, the resistance wires 4 stop heating;
wherein the DPFmaxRepresenting a third DPF carbon loading threshold, DPFmax60% -70% of the full-load carbon loading of the DPF carrier 6;
t represents the real-time total gas temperature, TminRepresenting a first effluent gas temperature threshold, Tmin300-400 ℃; t ismaxRepresenting a second effluent gas temperature threshold, Tmax600-650 ℃;
Voxygen gasRepresenting the concentration of exhaust gas oxygen, VOxygen 0Representing the main exhaust oxygen concentration threshold, V Oxygen 03 to 4 percent.
More specifically, in one example, in the cases (ii) and (iii), after performing the ash removal treatment on the DPF in the jth group of pipelines, the method further includes: when DPFj≤DPFminWhen the ash removal is finished, the opening and closing of the valve are selected according to the normal condition, wherein the DPF isminRepresenting a first DPF carbon loading threshold, DPFmin10% and 15% of the full carbon loading of the DPF carrier 6.
The active regeneration mainly comprises the reaction of oxygen and carbon, namely, the carbon in the DPF carrier is burnt at high temperature, so that the active regeneration is carried out at the high temperature; and passive regeneration is mainly NO2And carbon to consume the carbon in the DPF carrier, and the temperature required for the reaction to proceed is relatively low, perhaps below 400 ℃. Thus, inIn any of the above embodiments of the present application, the case where the resistance wire 4 participates in heating or at a high temperature (temperature 600-650 ℃) is active regeneration, and the case where the resistance wire 4 does not participate in heating and at a lower temperature (temperature 300-400 ℃) is passive regeneration.
In any of the embodiments described above in the present application, the selection of the opening and closing of the valve according to the normal condition means: after the ash cleaning is finished, the logic of 'the check valve 3 is fully opened' is restored, and then the corresponding steps are carried out.
The invention relates to a method for controlling trapping and passive regeneration of carbon load of DPF (diesel particulate filter), which is used for clearing the carbon load in the DPF on the premise of mainly passive regeneration and secondarily active regeneration.
As follows, a specific example is illustrated:
the device for controlling the carbon-supported trapping and passive regeneration of the DPF provided by the embodiment of the application is shown in FIG. 1, wherein two DPF are designed, namely two sets of DPF pipelines are arranged. In the present embodiment, two DPF carriers are named a DPF carrier No. one 6 and a DPF carrier No. two 601, respectively.
The device for controlling the trapping of the carbon load of the DPF and the passive regeneration provided by the embodiment of the application utilizes the one-way valve to switch the flow of the waste gas between the two DPF carriers according to the carbon load amount in the two DPF carriers, and is matched with the front heating resistance wire of each DPF carrier to heat the DPF carriers to reduce the carbon load amount in the DPF carriers by means of passive regeneration under most conditions; the temperature control device has the advantages of high temperature controllability, quick temperature rise and less over-temperature phenomenon.
The embodiment of the present application provides a DPF carbon trapping and passive regeneration control method, applied to the device for controlling DPF carbon trapping and passive regeneration described in any of the above embodiments, and as shown in fig. 2, the method includes:
the NOx sensor 1 is used for testing the concentration of the exhaust gas NOx in the main path and the concentration of the exhaust gas oxygen in the main path of the exhaust gas entering the first DPF carrier 6 and the second DPF carrier 601;
the air flow meter 2 and the second air flow meter 201 are used for respectively measuring the mass flow of air entering the first DPF carrier 6 and the second DPF carrier 601, namely the air inflow;
two check valves 3 and two second check valves 301, which respectively control whether the exhaust gas passes through the first DPF carrier 6 and the second DPF carrier 601;
the resistance wire 4 and the second resistance wire 401 are used for heating the gas passing through the first DPF carrier 6 and the second DPF carrier 601;
the pressure difference sensor 5 and the pressure difference sensor 501 are used for respectively measuring DPF pressure differences of the first DPF carrier 6 and the second DPF carrier 601, calculating flow resistance of the first DPF carrier 6 and the second DPF carrier 601 by combining the carrier volumes of the first DPF carrier 6 and the second DPF carrier 601, and calculating carbon carrying amounts of the first DPF carrier 6 and the second DPF carrier 601;
the temperature sensor 7 measures the temperature of the exhaust gas after passing through the first DPF carrier 6 and the second DPF carrier 601.
Referring to the general schematic diagram of the control method shown in fig. 2, after the whole vehicle is started, the check valves 3 and 301 are all opened, each test part starts to test, and real-time test data is fed back to the control center.
DPF loaded with carbon on DPF I1And No. two DPF Carrier carbon Loading DPF2Comparison, DPF Carrier carbon Loading of DPF No. one1And a second DPF carrier carbon loading threshold value DPFm(in one example, DPFm40% full load of DPF carrier No. one 6), DPF carrier No. two carbon loading DPF2And a second DPF carrier carbon loading threshold value DPFm(in one example, DPFm40% of the second DPF carrier 601 loading), into six cases, tabulated below:
TABLE 1 DPF carbon loading amount DPF1And DPF carbon loading amount No. two2Comparison
Figure BDA0003120244750000101
1) Referring to FIG. 3, when the NOx sensor 1 monitors that the exhaust gas NOx concentration in the main exhaust gas of the exhaust gas is greater than or equal to the NOx concentration threshold (in one example, the NOx concentration threshold is set to 10ppm) and conditions are met [ [ phi ] ], the output is true, the check valve 3 of the first DPF line is closed, and the check valve 3 of the second DPF line is closedValve 301 is open, at which time the vehicle is operating normally; at this time, if the temperature of the effluent gas T measured by the temperature sensor 7 is less than or equal to the first effluent gas temperature threshold Tmin(350 ℃), and No. two DPF carrier carbon loading amount DPF2DPF carbon loading threshold value of more than or equal to third DPFmax(in one example, DPFmax60% of the second DPF carrier 601 full load), the output is true at this time, the resistance wire 401 starts to heat, otherwise, the output is false, and the resistance wire 401 stops heating. Since passive regeneration is relatively strong after a certain temperature is met and a certain NOx concentration is met, temperature and NOx concentration requirements are set here.
When the NOx sensor 1 monitors that the concentration of the NOx in the exhaust gas in the main path of the exhaust gas is less than the NOx concentration threshold (10ppm) and meets the condition I, the output is false, the check valve 3 is opened, the check valve 301 is closed, and if the NOx is not met, passive regeneration is basically not performed at the moment, so that the exhaust gas can walk on the DPF carrier 6 with small carbon loading.
2) Referring to fig. 4, when the NOx sensor 1 monitors that the concentration of the exhaust gas in the main exhaust gas path is not less than the NOx concentration threshold (10ppm) and meets the condition ≥ yes, the output is true, the check valve 3 is opened, the check valve 301 is closed, the vehicle normally runs at the moment, and at the moment, if the temperature sensor 7 is not more than the first effluent gas temperature threshold Tmin(350 ℃), and No. two DPF carrier carbon loading amount DPF2DPF carbon loading threshold value of more than or equal to third DPFmax(60% of full load of the DPF carrier 6 No. one), the output is true at the moment, the resistance wire 4 starts to heat, otherwise, the output is false, and the resistance wire 4 stops heating. Since passive regeneration is relatively strong after a certain temperature is met and a certain NOx concentration is met, temperature and NOx concentration requirements are set here.
When the NOx sensor 1 monitors that the concentration of the NOx in the exhaust gas in the main path of the exhaust gas is less than the NOx concentration threshold (10ppm) and meets the condition II, the output is false, the check valve 3 is closed, the check valve 301 is opened, and if the NOx is not met, passive regeneration is basically not performed at the moment, so that the exhaust gas can walk on the second DPF carrier 601 with small carbon loading capacity.
3) Referring to fig. 5, when the NOx sensor 1 monitors that the concentration of the exhaust gas in the main exhaust gas path is not less than the NOx concentration threshold (10ppm) and satisfies the condition (c), the output is true, the check valve 3 is closed, the check valve 301 is opened, and the first output is No. oneThe DPF carrier 6 is subjected to ash removal treatment, and at the moment, if the monitoring of the concentration of the main exhaust oxygen of the NOx sensor 1 is met, the concentration of the main exhaust oxygen is more than or equal to the main exhaust oxygen concentration threshold value VOxygen 0(3%) is true, the check valve 3 is opened, the check valve 301 is closed, and at this time, if the temperature of the main path outflow gas T measured by the temperature sensor 7 is less than or equal to the second outflow gas temperature threshold Tmax(600 ℃), the resistance wire 4 starts to heat, if the temperature of the gas flowing out of the main path of the temperature sensor 7 is more than the temperature threshold value T of the second flowing-out gasmax(600 ℃) and the resistance wire 4 is switched off for heating.
When the carbon loading amount of the first DPF carrier is DPF1≤DPFmin(10% of full load of the first DPF carrier 6), finishing the ash removal of the first DPF carrier 6, and selecting the opening and closing of a valve according to normal conditions; because the regeneration is active, the active regeneration needs to meet the requirements of temperature and oxygen concentration; if the NOx sensor 1 monitors the concentration V of the exhaust gas in the main pathOxygen gasIf < main exhaust gas oxygen concentration threshold Voxygen 0 (3%) is false, the first DPF carrier 6 is not cleaned, and the valve is selected to be opened and closed according to normal conditions. In this case, the oxygen concentration is low and does not satisfy the requirement for active regeneration, so that active regeneration cannot be performed.
When the NOx sensor 1 monitors that the concentration of NOx in the exhaust main exhaust gas is less than the NOx concentration threshold (10ppm) and meets the condition III, the output is false, the one-way valve 3 is closed, the one-way valve 301 is opened, and the vehicle runs normally. If NOx is not satisfied, there is substantially no passive regeneration at this time, so the exhaust gas is allowed to flow over the second DPF carrier 601 with a small carbon loading.
4) Referring to fig. 6, when the concentration of the exhaust gas in the main exhaust gas monitored by the NOx sensor 1 is greater than or equal to the NOx concentration threshold (10ppm) and the condition is satisfied, the output is true, the check valve 3 is opened, the check valve 301 is closed, the DPF301 ii performs ash removal, and at this time, if the concentration of the exhaust gas in the main exhaust gas monitored by the NOx sensor 1 is satisfied, the concentration V isOxygen gasThreshold value V for oxygen concentration of exhaust gas of not less than main pathOxygen 0(3%) is true, the check valve 3 is closed, the check valve 301 is opened, and at this time, if the temperature of the main path outflow gas T measured by the temperature sensor 7 is less than or equal to the second outflow gas temperature threshold Tmax(600 ℃), the resistance wire 401 starts to heat, if the temperature T of the main path outflow gas measured by the temperature sensor 7 is more than the temperature of the second outflow gasDegree threshold Tmax(600 deg.C.) the heating of resistance wire 401 is turned off. When carbon loading capacity of second DPF carrier is lower than that of the first DPF carrier2≤DPFmin(10% of the second DPF carrier 601 full load), the second DPF carrier 601 ash removal is finished, and the opening and closing of the valve are selected according to the normal condition; because the regeneration is active, the active regeneration needs to meet the requirements of temperature and oxygen concentration;
if the NOx sensor 1 monitors the concentration V of the exhaust gas in the main pathOxygen gas< threshold value V of concentration of oxygen in exhaust gas of main pathOxygen 0(3%) is false, the second DPF carrier 601 ash removal is not performed, and the opening and closing of the valve is selected according to the normal situation. In this case, the oxygen concentration is low and does not satisfy the requirement for active regeneration, so that active regeneration cannot be performed.
When the NOx sensor 1 monitors that the concentration of NOx in the exhaust gas of the main path of the exhaust gas is less than the NOx concentration threshold (10ppm) and meets the condition (IV), the output is false, the check valve 3 is opened, the check valve 301 is closed, and the vehicle runs normally. If NOx is not satisfied, there is substantially no passive regeneration at this time, so the exhaust gas is let to go through the first DPF carrier 6 with a small carbon loading.
5) Referring to fig. 7, when the NOx sensor 1 monitors that the concentration of the exhaust gas in the main exhaust gas path is greater than or equal to the NOx concentration threshold (10ppm) and satisfies the condition (c), the output is true, the check valve 3 is opened, the check valve 301 is opened, and the first DPF carrier 6 and the second DPF carrier 601 are subjected to ash removal treatment;
at this time, the main exhaust gas oxygen concentration V is monitored if the NOx sensor 1 is satisfiedOxygen gasThreshold value V for oxygen concentration of exhaust gas of not less than main pathOxygen 0(3%) is true, and DPF1≤DPF2Then the one-way valve 3 is closed and the one-way valve 301 is opened, at this time, if the temperature of the main path outflow gas T measured by the temperature sensor 7 is less than or equal to the second outflow gas temperature threshold value Tmax(600 ℃), the resistance wire 401 starts to heat, if the temperature T of the main path outflow gas measured by the temperature sensor 7 is more than the temperature threshold T of the second outflow gasmax(600 ℃), the resistance wire 401 is switched off for heating;
when carbon loading capacity of second DPF carrier is lower than that of the first DPF carrier2≤DPFmin(10% of the second DPF carrier 601 full load), the second DPF carrier 601 ash removal is finished, and the opening and closing of the valve are selected according to the normal condition; since this time isActive regeneration, wherein the active regeneration needs to meet the requirements of temperature and oxygen concentration; if the NOx sensor 1 monitors the concentration V of the exhaust gas in the main pathOxygen gas< threshold value V of concentration of oxygen in exhaust gas of main pathOxygen 0(3%) is false, the second DPF carrier 601 ash removal is not performed, and the opening and closing of the valve is selected according to the normal situation. In this case, the oxygen concentration is low and does not satisfy the requirement for active regeneration, so that active regeneration cannot be performed.
When the NOx sensor 1 monitors that the concentration of the exhaust gas in the main passage is less than the NOx concentration threshold value (10ppm) and satisfies the condition (c), the output is false, the check valve 3 is opened, the check valve 301 is opened, and the vehicle runs normally. If the NOx is not satisfied, there is substantially no passive regeneration at this time, so the check valves 3, 301 are all opened to ensure that the exhaust gas is relatively sufficient at this time (case # this case does not occur substantially).
6) Similarly to the case of 5), referring to fig. 7, when the NOx sensor 1 monitors that the concentration of the exhaust gas in the main exhaust gas is not less than the NOx concentration threshold (10ppm) and satisfies the case 6, the output is true, the check valve 3 is opened, the check valve 301 is opened, and the first DPF carrier 6 and the second DPF carrier 601 are subjected to ash removal treatment;
at this time, the main exhaust gas oxygen concentration V is monitored if the NOx sensor 1 is satisfiedOxygen gasThreshold value V for oxygen concentration of exhaust gas of not less than main pathOxygen 0(3%) is true, and DPF1＞DPFminThen the one-way valve 301 is closed and the one-way valve 3 is opened, at this time, if the temperature of the main path outflow gas T measured by the temperature sensor 7 is less than or equal to the second outflow gas temperature threshold Tmax(600 ℃), the resistance wire 4 starts to heat, if the temperature T of the main path outflow gas measured by the temperature sensor 7 is more than the temperature threshold T of the second outflow gasmax(600 ℃) and the resistance wire 4 is switched off for heating.
When the carbon loading amount of the first DPF carrier is DPF1≤DPFmin(10% of full load of the first DPF carrier 6), finishing the ash removal of the first DPF carrier 6, and selecting the opening and closing of a valve according to normal conditions; because the regeneration is active, the active regeneration needs to meet the requirements of temperature and oxygen concentration; if the NOx sensor 1 monitors the concentration V of the exhaust gas in the main pathOxygen gas< threshold value V of concentration of oxygen in exhaust gas of main pathOxygen 0(3%) is false, the soot cleaning of the DPF carrier No. one 6 is not performed,the valve is selected to open and close according to normal conditions. In this case, the oxygen concentration is low and does not satisfy the requirement for active regeneration, so that active regeneration cannot be performed.
When the NOx sensor 1 monitors that the concentration of the exhaust gas in the main path is less than the NOx concentration threshold value (10ppm) and the condition 6 is met, the output is false, the check valve 301 is opened, the check valve 3 is opened, and the vehicle runs normally. If the NOx is not satisfied, there is substantially no passive regeneration at this time, so the check valves 3, 301 are all open, ensuring that the exhaust is relatively adequate at this time (case 6, which does not occur substantially).
It should be noted that the selection of the opening and closing of the valve according to the normal condition described in the above 6 cases means: after the ash cleaning is finished, the logic of 'the check valve 3, 301 is fully opened' is restored, and then the corresponding steps are carried out. In the above 6 cases, the case where the resistance wire 4 or the resistance wire 401 participates in heating or the high temperature (temperature 600 ℃ to 650 ℃) is active regeneration, and the case where the resistance wire 4 or the resistance wire 401 does not participate in heating and the temperature is low (temperature 300 ℃ to 400 ℃) is passive regeneration.
In this embodiment, mainly by passive regeneration (NO)2+C+O2→CO2+ NO) to reduce the carbon loading in the DPF, three conditions need to be met to achieve passive regeneration: 1) the temperature is 300-400 ℃; 2) has a certain NO2Concentration (> 10 ppm); 3) there is some carbon loading (the more carbon loading, the more intense the passive regeneration). And when the carbon loading in the DPF is greater than 50%, the carbon in the DPF is treated by active regeneration.
From the above 6 working conditions, it can be seen that when the temperature of a certain DPF is 300-400 ℃, carbon in the DPF is consumed mainly by means of passive regeneration, and when the carbon in the DPF exceeds a certain value, active regeneration (C + O) is used2→CO2) Carbon in the DPF is eliminated. The purpose of setting two DPFs in this embodiment is to make the temperature of the air flow entering the DPF reach 300-400 ℃ on the one hand, and on the other hand, to select a DPF whose carbon loading meets the set requirement (compared with two DPFs, the DPF with a larger carbon loading and the carbon loading meets 30% -50%) on the other hand. The DPF is selected to flow by the waste gas flow by controlling the opening and closing of the check valveThe DPF is passively regenerated; when the temperature of the waste gas is insufficient, the waste gas can leave the DPF with low carbon loading capacity through opening and closing the one-way valve.
To sum up, the embodiments of the present invention can implement the following functions:
1. removing the carbon load in the DPF carrier mainly by passive regeneration;
2. the active regeneration realizes the temperature increase in front of the DPF carrier by means of resistance wire heating;
3. switch over each other through two DPF carriers, when one of them DPF carrier is tired carbon more, waste gas can be discharged through another carrier, when the preceding temperature of DPF carrier is higher, can realize carrying out passive regeneration to the carrier that carbon loading capacity is more.
Similarly, the application of the two DPF carriers according to the embodiment of the present invention may also be applicable to a switching mode of three or more DPF carriers, and through switching the DPF carriers with each other, when one of the DPF carriers accumulates more carbon, the exhaust gas may be discharged through the other DPF carriers, and when the temperature in front of the DPF carrier is higher, the passive regeneration of the DPF carrier with more carbon may be implemented. The mutual switching mode of the DPF carriers also mainly removes the carbon loading amount in the DPF carriers by passive regeneration, and the active regeneration realizes the temperature increase in front of the DPF carriers by means of resistance wire heating.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (6)

1. A device for controlling the trapping and passive regeneration of carbon load of DPF, characterized in that it comprises a NOx sensor (1), a DPF parallel-connection module and a temperature sensor (7), said NOx sensor (1) being located on the upstream line of said DPF parallel-connection module, said temperature sensor (7) being located on the downstream line of said DPF parallel-connection module;
the DPF parallel assembly comprises at least two groups of DPF pipelines which are arranged in parallel, each DPF pipeline comprises a DPF carrier (6), an air flow meter (2), a one-way valve (3), a differential pressure sensor (5) and a resistance wire (4),
the resistance wire (4) is positioned at the front end of each DPF carrier (6);
the two ends of the differential pressure sensor (5) are respectively connected with the inlet end and the outlet end of the corresponding DPF carrier (6), the check valve (3) is arranged on the upstream pipeline and the downstream pipeline of each DPF carrier (6), and the air flow meter (2) is arranged on the pipeline in front of the check valve (3) of the upstream pipeline;
the device also comprises a control center, wherein the receiving end of the control center is connected with the NOx sensor (1), the air flow meter (2), the differential pressure sensor (5) and the temperature sensor (7), and the output end of the control center is connected with the one-way valve (3) and the resistance wire (4);
the control method for controlling the DPF carbon-loaded trapping and passive regeneration device is applied to the control center and comprises the following steps:
receiving real-time measured values in response to exhaust gas entering the DPF parallel assembly, wherein the real-time measured values comprise NOx concentration collected by the NOx sensor (1), total exhaust gas oxygen concentration and one-way air mass flow collected by the air flow meter (2), one-way DPF differential pressure collected by the differential pressure sensor (5) and total outflowing gas temperature collected by the temperature sensor (7);
comparing the real-time measured value with a threshold value set by a system, and controlling the opening/closing of a one-way valve (3) and a resistance wire (4) based on the comparison result, wherein the opening/closing of the one-way valve (3) is used for switching the flow of exhaust gas between the DPF carriers (6), and the opening/closing of the resistance wire (4) is used for regulating and controlling the resistance wire (4) to start/stop heating the DPF carriers (6), and the method comprises the following steps:
the method comprises the steps of comparing the concentration of NOx in the exhaust gas of a main path, the concentration of oxygen in the exhaust gas of the main path and the carbon carrying capacity of a single DPF with a threshold value set by a system, controlling the opening/closing of each check valve (3) based on the comparison result, and switching the flow of the exhaust gas among different DPF carriers (6), and comprises the following steps: comparing the concentration of the exhaust gas NOx in the main path with the threshold value of the concentration of the NOx and the carbon carrying capacity of the single-path DPFnWith a second DPF carbon loading threshold DPFmControls the opening/closing of each check valve (3), wherein the DPF isnThe loading of the DPF of the nth group of pipelines is represented, and n is. DPFmThe carbon loading capacity of the DPF carrier (6) is 30% -50%, and the method specifically comprises the following steps: when the total exhaust gas NOx concentration < the NOx concentration threshold,
(1) if DPFn≤DPFmAnd a DPFi≥DPFjIf the vehicle runs normally, the check valve (3) on the jth group of pipelines is closed, and the check valve (3) on the ith group of pipelines is opened;
(2) if DPFi≤DPFm＜DPFjIf the vehicle runs normally, the check valve (3) on the jth group of pipelines is closed, and the check valve (3) on the ith group of pipelines is opened;
(3) if DPFn＞DPFmAnd then the check valves (3) on the n groups of pipelines are opened, and the vehicle runs normally.
2. The device for controlling the trapping and passive regeneration of the carbon load of the DPF as claimed in claim 1, wherein the resistance wire (4) is located at the front end of the DPF carrier (6), and the exhaust gas in the DPF pipeline enters the DPF carrier (6) after being heated to 600-650 ℃ by the resistance wire (4).
3. According to claimThe device for controlling DPF carbon-loaded trapping and passive regeneration as described in claim 1, wherein said comparison of the total exhaust gas NOx concentration with the NOx concentration threshold value and the single DPF carbon-loaded DPF is performednWith a second DPF carbon loading threshold DPFmAnd controlling the opening/closing of each check valve (3) further comprises:
when the concentration of the main exhaust gas NOx is larger than or equal to the threshold value of the concentration of the NOx,
(i) if DPFn≤DPFmAnd a DPFi≥DPFjIf the vehicle runs normally, the check valve (3) on the jth group of pipelines is closed, and the check valve (3) on the ith group of pipelines is opened;
(ii) if DPFj≤DPFm＜DPFiIf the exhaust gas is subjected to the soot cleaning treatment through the DPF of the ith group of pipelines, the check valve (3) of the jth group of pipelines is closed, the check valve (3) of the ith group of pipelines is opened, and the exhaust gas is subjected to the soot cleaning treatment through the DPF of the ith group of pipelines;
(iii) if DPFn＞DPFmAnd then the check valves (3) on the n groups of pipelines are opened, and the waste gas is subjected to ash removal treatment through the DPF on the n groups of pipelines at the same time.
4. The device for controlling the carbon-loaded trapping and passive regeneration of the DPF as claimed in claim 3, wherein the comparing the temperature of the main outflow gas and the carbon-loaded amount of the single-path DPF with the threshold value set by the system, and controlling the opening/closing of each resistance wire (4) based on the comparison result, and the controlling of the resistance wires (4) to start/stop heating the DPF carrier (6) comprises:
in the case of the (i) th case, when the vehicle normally travels to the DPFi≥DPFmaxAnd T is less than or equal to TminHeating the resistance wires (4) on the ith group of pipelines, otherwise, stopping heating the resistance wires (4);
in the case of (ii) or (iii), DPFi≥DPFjAfter the ash removal treatment, if VOxygen gas≥VOxygen 0Closing the one-way valve (3) on the ith group of pipelines, opening the one-way valve (3) on the jth group of pipelines, and performing ash removal treatment on the DPF of the jth group of pipelines until T is less than or equal to TmaxWhen the heating is finished, the resistance wires (4) on the jth group of pipelines start to be heated, otherwise, the resistance wires (4) stop heating;
wherein the DPFmaxRepresenting a third DPF carbon loading threshold, DPFmax60% -70% of the full-load carbon load of the DPF carrier (6);
t represents the real-time total gas temperature, TminRepresenting a first effluent gas temperature threshold, Tmin300-400 ℃;
Tmaxrepresenting a second effluent gas temperature threshold, Tmax600-650 ℃;
Voxygen gasRepresenting the concentration of exhaust gas oxygen, VOxygen 0Representing the main exhaust oxygen concentration threshold, VOxygen 03 to 4 percent.
5. The device for controlling trapping and passive regeneration of DPF on carbon according to claim 4, wherein in cases (ii) and (iii), said DPF in said j-th group of pipes further comprises, after ash removal treatment: when DPFj≤DPFminWhen the ash is removed, the ash removal is finished;
wherein the DPFminRepresenting a first DPF carbon loading threshold, DPFmin10% -15% of the full-load carbon load of the DPF carrier 6.
6. The DPF carbon trapping and passive regeneration control apparatus according to claim 1, wherein the comparing the real-time measured value with a threshold value set by a system, and controlling the opening/closing of the check valve (3) and the resistance wire (4) based on the comparison result, further comprises:
obtaining the corresponding single-path DPF carbon loading capacity according to the single-path air mass flow, the single-path DPF pressure difference and the carrier volume of the DPF carrier (6);
the temperature of the gas flowing out of the main path and the carbon carrying capacity of the single-path DPF are compared with a threshold value set by a system, the opening/closing of each resistance wire (4) is controlled based on the comparison result, and the resistance wires (4) are regulated and controlled to start/stop heating on the DPF carrier (6).
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