CN115949521B - Aftertreatment system regeneration control method and device and vehicle - Google Patents
Aftertreatment system regeneration control method and device and vehicle Download PDFInfo
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- 238000011069 regeneration method Methods 0.000 title claims abstract description 139
- 230000008929 regeneration Effects 0.000 title claims abstract description 138
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000002347 injection Methods 0.000 claims abstract description 223
- 239000007924 injection Substances 0.000 claims abstract description 223
- 239000000446 fuel Substances 0.000 claims abstract description 51
- 238000012360 testing method Methods 0.000 claims description 35
- 238000011144 upstream manufacturing Methods 0.000 claims description 26
- 238000012805 post-processing Methods 0.000 claims description 7
- 230000002459 sustained effect Effects 0.000 claims 1
- 238000002679 ablation Methods 0.000 abstract description 6
- 230000009849 deactivation Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 32
- 239000002245 particle Substances 0.000 description 21
- 230000001276 controlling effect Effects 0.000 description 14
- 230000000875 corresponding effect Effects 0.000 description 14
- 230000003197 catalytic effect Effects 0.000 description 9
- 230000003647 oxidation Effects 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- 239000003054 catalyst Substances 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- 239000002283 diesel fuel Substances 0.000 description 4
- 239000013618 particulate matter Substances 0.000 description 4
- 230000002596 correlated effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002779 inactivation Effects 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention provides a regeneration control method of an aftertreatment system, a regeneration control device of the aftertreatment system and a vehicle, wherein the control method comprises the following steps: calculating the DOC regeneration demand fuel injection quantity; calling a DOC flow uniformity map and a DOC maximum fuel injection amount map; correcting the fuel injection quantity required for regeneration based on the DOC flow uniformity map; inquiring the corresponding maximum oil injection quantity in the DOC maximum oil injection quantity map according to the corrected regeneration demand oil injection quantity; judging the numerical relation between the regeneration required oil injection quantity and the maximum oil injection quantity; and controlling the DOC regeneration fuel injection quantity according to the numerical value size relation. According to the control method, the DOC regeneration required oil injection quantity is corrected according to the pre-DOC pre-HC distribution uniformity reflected by a pre-stored DOC flow uniformity map, and the corrected DOC regeneration required oil injection quantity is compared with the corresponding maximum oil injection quantity in the DOC maximum oil injection quantity map, so that the DOC regeneration oil injection quantity is controlled, and the problems of DOC high-temperature deactivation, ablation, great HC leakage and the like are avoided.
Description
Technical Field
The present invention relates to the field of vehicle technologies, and in particular, to a method for controlling regeneration of a post-processing system, a device for controlling regeneration of a post-processing system, and a vehicle.
Background
This section provides merely background information related to the present disclosure and is not necessarily prior art.
Current control strategies rely primarily on closed loop control of HC (hydrocarbon) injection at exhaust temperatures upstream of the DPF (Diesel Particulate Filter, diesel particulate trap), HC (hydrocarbon) injection being performed when the pre-DPF temperature is below a target set point, and being maintained for a certain period of time until regeneration is completed after the pre-DPF temperature reaches the target set point.
In the actual use process, it is found that, due to uneven air flow distribution, the HC sprayed into the exhaust pipeline is not evenly distributed on the front end face of the DOC, and some areas of the end face of the DOC (Diesel Oxidation Catalysis, oxidation catalyst) are fully oxidized by the DOC, but some areas of the HC are not fully oxidized, and even liquid diesel is formed due to lower local temperature. Because injected HC is not fully oxidized, the temperature after the DOC cannot reach the target temperature, the HC injection quantity can be continuously increased according to the current control strategy, a large amount of liquid diesel oil can be accumulated in a local area of the DOC, the DOC is deactivated at high temperature after ignition, and the DOC carrier is cracked or ablated locally due to uneven temperature.
In the test, when the target temperature is raised, HC in the area where some temperature sensors are located cannot be completely oxidized, the temperature of the area can be drastically reduced, a large amount of unoxidized fuel forms adhesion, and the rear end face of the DOC is provided with a trace of diesel oil which is not completely oxidized, so that more fuel adhesion is formed.
Disclosure of Invention
The invention aims to at least solve the problem that the DOC of the existing aftertreatment system is easy to fail or HC leaks. The aim is achieved by the following technical scheme:
the first aspect of the present invention provides a regeneration control method for an aftertreatment system, comprising the steps of:
Calculating the DOC regeneration demand fuel injection quantity;
calling a DOC flow uniformity map and a DOC maximum fuel injection amount map;
correcting the regeneration required oil injection quantity based on the DOC flow uniformity map;
inquiring the corresponding maximum oil injection quantity in the DOC maximum oil injection quantity map according to the corrected regeneration required oil injection quantity;
judging the numerical relation between the regeneration required oil injection quantity and the maximum oil injection quantity;
And controlling the DOC regeneration fuel injection quantity according to the numerical value size relation.
According to the regeneration control method of the aftertreatment system, the DOC regeneration required oil injection quantity during aftertreatment regeneration is calculated according to the working condition of the engine, the DOC regeneration required oil injection quantity is corrected according to the pre-DOC HC distribution uniformity reflected by a pre-stored DOC flow uniformity map, the corrected DOC regeneration required oil injection quantity is compared with the corresponding maximum oil injection quantity in a DOC maximum oil injection quantity map, the DOC regeneration oil injection quantity is further controlled, and the problems of DOC high-temperature deactivation, ablation, HC massive leakage and the like are avoided.
In addition, the aftertreatment system regeneration control method according to the present invention may further have the following additional technical features:
in some embodiments of the present invention, the step of calculating the DOC regeneration demand fuel injection amount includes:
receiving an engine working condition signal;
and calculating the DOC regeneration demand fuel injection quantity according to the engine working condition signal.
In some embodiments of the invention, the engine operating condition signal includes at least one of a DPF upstream target temperature signal, a DOC upstream temperature signal, and an exhaust flow signal.
In some embodiments of the present invention, the DOC flow uniformity map is obtained according to an engine test, in which a radial cross section at an inlet of a DOC is divided into a plurality of test areas, uniformity coefficients of the plurality of test areas are measured under different exhaust gas flows, and a maximum uniformity coefficient is obtained by comparison, and the DOC flow uniformity map is generated according to the exhaust gas flows and the maximum uniformity coefficient.
In some embodiments of the invention, the maximum injection amount map of the DOC is obtained according to an engine test in which the maximum injection amount that the DOC can normally operate at different temperatures upstream of the DOC and different exhaust gas flows is tested, and the maximum injection amount map of the DOC is generated according to the temperatures upstream of the DOC, the exhaust gas flows and the maximum injection amount.
In some embodiments of the present invention, the step of correcting the regeneration-required fuel injection amount based on the DOC flow uniformity map includes:
Inquiring the DOC flow uniformity map according to the engine working condition signal to obtain a corresponding maximum uniformity coefficient;
And calculating the product of the maximum uniformity coefficient and the regeneration required oil injection quantity.
In some embodiments of the present invention, the step of controlling the regenerated fuel injection amount of the DOC according to the numerical magnitude relation includes:
Controlling the DOC to carry out regeneration oil injection according to the regeneration required oil injection quantity according to the fact that the product of the maximum uniformity coefficient and the regeneration required oil injection quantity is smaller than or equal to the maximum oil injection quantity;
And controlling the DOC to carry out regeneration oil injection according to the maximum oil injection quantity according to the fact that the product of the maximum uniformity coefficient and the regeneration required oil injection quantity is larger than the maximum oil injection quantity.
In some embodiments of the invention, the plurality of test areas are distributed in a rectangular array.
A second aspect of the present invention proposes an aftertreatment system regeneration control device for executing the aftertreatment system regeneration control method proposed according to the first aspect of the present invention, comprising:
the obtaining device is used for obtaining a DOC flow uniformity map and a DOC maximum oil injection amount map;
The computing device is used for computing the DOC regeneration demand oil injection quantity and correcting the regeneration demand oil injection quantity according to the DOC flow uniformity map;
The judging device is used for judging the magnitude relation between the corrected required oil injection quantity and the corresponding maximum oil injection quantity, wherein the maximum oil injection quantity is the corresponding maximum oil injection quantity of the corrected required oil injection quantity in the DOC maximum oil injection quantity map;
and the control device is used for controlling the regenerated fuel injection quantity of the DOC according to the judging result of the judging device.
According to the regeneration control device of the aftertreatment system, which is provided by the second aspect of the invention, an engine working condition signal, a pre-stored DOC flow uniformity map and a DOC maximum oil injection amount map are obtained through the obtaining device, after the required oil injection amount during DOC regeneration is calculated, the required oil injection amount is corrected according to the DOC flow uniformity map, and then the corrected required oil injection amount and the corresponding maximum oil injection amount in the DOC maximum oil injection amount map are judged, so that the regenerated oil injection amount of the DOC is controlled, and the problems of DOC high-temperature inactivation, ablation, HC massive leakage and the like are avoided.
A third aspect of the present invention proposes a vehicle comprising:
a post-processing system;
The aftertreatment system regeneration control device is provided in the second aspect of the present invention, and the aftertreatment system regeneration control device is used for controlling the regeneration fuel injection amount of the aftertreatment system.
The vehicle according to the third aspect of the present invention has the same advantages as the aftertreatment system regeneration control device according to the second aspect of the present invention, and will not be described in detail herein.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures.
In the drawings:
FIG. 1 schematically illustrates a flow diagram of an aftertreatment system regeneration control method, in accordance with an embodiment of the present disclosure;
FIG. 2 schematically illustrates a schematic diagram of a test zone division of a DOC for an aftertreatment system regeneration control method, in accordance with an embodiment of the present disclosure;
FIG. 3 schematically illustrates a schematic configuration of an aftertreatment system regeneration control device, in accordance with an embodiment of the present disclosure;
the reference numerals are as follows:
10: DOC, 11: test area, 12: HC injection device;
20：DPF；
30：SCR：
40: aftertreatment system regeneration control device, 41: acquisition device, 42: computing device, 43: judgment device, 44: and a control device.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Accordingly, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.
As shown in fig. 1 to 3, a first aspect of the present invention proposes a regeneration control method of an aftertreatment system, including the steps of:
Calculating the DOC regeneration demand fuel injection quantity;
calling a DOC flow uniformity map and a DOC maximum fuel injection amount map;
Correcting the fuel injection quantity required for regeneration based on the DOC flow uniformity map;
Inquiring the corresponding maximum oil injection quantity in the DOC maximum oil injection quantity map according to the corrected regeneration demand oil injection quantity;
Judging the numerical relation between the regeneration required oil injection quantity and the maximum oil injection quantity;
and controlling the DOC regeneration fuel injection quantity according to the numerical value size relation.
It is appreciated that the aftertreatment system of a diesel engine mainly comprises an oxidation catalytic converter (Diesel Oxidation Catalysis, DOC), a particulate trap (Diesel Particulate Filter, DPF) and a selective catalytic converter (SELECTIVE CATALYTIC Reduciton, SCR) arranged along the exhaust gas flow direction.
The exhaust gas of a diesel engine is first passed through an oxidation catalytic converter, which generally uses noble metal or ceramic as a catalyst carrier. Under the action of the catalyst, CO and HC in the exhaust gas are oxidized and converted into nontoxic and harmless CO 2 and H 2 O, NO is converted into NO 2, and meanwhile, the oxidation catalytic converter can also absorb soluble organic components and part of carbon particles, so that emission of part of PM is reduced. And oxidizing NO into NO 2, allowing the exhaust gas to enter a particulate matter catcher after passing through an oxidation catalytic converter, catching particles in the exhaust gas, and finally exhausting the particles into the atmosphere through a selective catalytic converter to realize the aftertreatment of the tail gas.
The particle catcher has the advantages that the phenomenon that a large amount of particles are accumulated to block the particle catcher can occur along with the increase of the running time and mileage of the particle catcher, so that the exhaust back pressure is increased, the power performance and the economic performance of the engine are deteriorated, and the particles attached to the particle catcher are removed by a regeneration method in time.
Active regeneration is one of the methods of regenerating a particulate trap that uses external energy to raise the temperature within the particulate trap to ignite and burn the particulate. Specifically, when the front-rear differential pressure sensor of the particle catcher detects that the back pressure of the front and rear of the particle catcher is too large, the accumulated particle quantity which can be born by the particle catcher is considered to be reached, and at the moment, the temperature in the particle catcher is increased through mixing and burning of external energy such as diesel oil and waste gas sprayed before an oxidation type catalytic converter, so that the deposited particle in the particle catcher is oxidized and burned, and the aim of regeneration is achieved.
In the active regeneration process, the oil injection quantity of the post-treatment diesel oil injection system needs to be effectively controlled, so that the temperature in the particle catcher reaches the ignition temperature of the particles, the particles are fully combusted, and the regeneration effect of the particle catcher is improved. And moreover, the exceeding of the oil injection quantity is avoided, so that the temperature in the particulate matter catcher is raised too fast and exceeds the highest temperature resistance of a catalyst of the aftertreatment system, the catalyst is burnt, even the functional failure of the aftertreatment system is caused, and the exhaust is out of standard. There is also a need to avoid the problem of HC leakage in large amounts that occurs when the injection amount is overrun.
According to the method, the DOC regeneration required oil injection quantity during regeneration is calculated at first, the DOC regeneration required oil injection quantity can be obtained through calculation according to an existing strategy of an engine, for example, MAP (MAP) images which are pre-stored in an ECU (electronic control unit) of the engine and are calibrated in detail according to different machine types under different working conditions are obtained through calculation according to the difference between the set temperature before the particulate matter catcher and the actual temperature after the particulate matter catcher is compared. And then calling a DOC flow uniformity map and a DOC maximum fuel injection amount map. The DOC flow uniformity map is a map which is pre-stored in the ECU and is related to the flow distribution characteristic of the DOC, the flow distribution characteristic of the exhaust gas in the DOC is reflected, and the DOC maximum fuel injection amount map is a map which is pre-stored in the ECU and is related to the maximum fuel injection amount allowed by the DOC under different working conditions. And correcting the regeneration demand oil injection quantity according to the DOC flow uniformity map based on the same working condition, and finally, inquiring the corresponding maximum oil injection quantity in the DOC maximum oil injection quantity map according to the corrected regeneration demand oil injection quantity, judging the numerical value relation between the regeneration demand oil injection quantity and the maximum oil injection quantity, and controlling the DOC regeneration oil injection quantity according to the numerical value relation so as to avoid post-treatment inactivation or burnout caused by the over-limit of the oil injection quantity.
According to the regeneration control method of the aftertreatment system, the DOC regeneration required oil injection quantity during aftertreatment regeneration is calculated according to the working condition of the engine, the DOC regeneration required oil injection quantity is corrected according to the pre-DOC HC distribution uniformity reflected by a pre-stored DOC flow uniformity map, the corrected DOC regeneration required oil injection quantity is compared with the corresponding maximum oil injection quantity in a DOC maximum oil injection quantity map, the DOC regeneration oil injection quantity is further controlled, and the problems of DOC high-temperature deactivation, ablation, HC massive leakage and the like are avoided.
In some embodiments of the present invention, the step of calculating the DOC regeneration demand fuel injection amount includes:
receiving an engine working condition signal;
And calculating the DOC regeneration demand fuel injection quantity according to the engine working condition signal.
Specifically, the engine working condition signals can be obtained according to various sensors arranged on the engine, and the various sensors are electrically connected with the ECU to realize signal transmission. The engine working condition signals can comprise a DPF upstream target temperature signal, a DOC upstream temperature signal and an exhaust gas flow signal, the DOC regeneration required oil injection quantity is positively correlated with the difference value between the DPF upstream temperature signal and the DPF upstream target temperature signal, namely the larger the difference value is, the more the oil injection quantity is required to be increased, the DPF upstream temperature is increased to the target temperature as soon as possible, the DOC regeneration required oil injection quantity is positively correlated with the exhaust gas flow, and the more the exhaust gas flow is required to be increased, so that the DPF upstream temperature is increased to the target temperature as soon as possible.
In some embodiments of the invention, the engine operating condition signal includes at least one of a DPF upstream target temperature signal, a DOC upstream temperature signal, and an exhaust flow signal.
The DPF upstream target temperature signal is set according to the temperature required for DPF regeneration, for example, to 550 ℃ or higher, so that the particulates adhering to the DPF can be burned at a high temperature and discharged out of the aftertreatment system. The DPF upstream target temperature signal can be calibrated in the ECU of the engine in advance and can be called at any time when the DPF upstream target temperature signal is used. The DOC upstream temperature signal may be obtained according to a temperature sensor disposed at the inlet of the DOC and electrically connected to the ECU to realize signal transmission, and the exhaust gas flow signal may be obtained according to a flow sensor disposed on the exhaust pipe of the engine, which is specifically referred to the prior art and is not further limited herein.
In some embodiments of the invention, the DOC flow uniformity map is obtained according to an engine test in which the radial cross section at the inlet of the DOC is divided into a plurality of test areas 11, the uniformity coefficients of the plurality of test areas 11 are measured at different exhaust gas flows, and the maximum uniformity coefficient is obtained by comparison, and the DOC flow uniformity map is generated according to the exhaust gas flow and the maximum uniformity coefficient.
Specifically, in the engine test stage, the radial section at the inlet of the DOC is divided into a plurality of test areas 11, and a rectangular array can be adopted to perform grid division, so that the areas of the areas are as close as possible, and then probes for monitoring the flow rate are arranged in the test areas 11 in a one-to-one correspondence manner, so that the flow rate of each test area 11 can be monitored by the probes. In the test, different exhaust gas flows are set, the flow of each test area 11 is monitored, then the flow uniformity coefficient of each test area 11 under different flows is obtained, the uniformity coefficient is positively correlated with the flow monitored at the position, the maximum uniformity coefficient under different exhaust gas flows can be obtained through comparison, the maximum uniformity coefficient corresponds to the test area 11 with the maximum flow, furthermore, a DOC flow uniformity map is generated according to the maximum uniformity coefficient and the exhaust gas flow, wherein the abscissa can be the maximum uniformity coefficient and the exhaust gas flow respectively, and the DOC flow uniformity map can be configured into a CURVE (CURVE) diagram.
In some embodiments of the invention, the DOC maximum injection amount map is obtained according to an engine test in which the DOC maximum injection amount map is generated according to the DOC upstream temperature, the exhaust gas flow and the maximum injection amount under normal operation under different DOC upstream temperatures and different exhaust gas flows.
It can be understood that in the engine test, different temperatures of the upstream of the DOC and the flow of the exhaust gas are set, then the fuel injection quantity of the DOC is regulated, and the maximum fuel injection quantity of the DOC capable of working normally is tested, wherein the normal working refers to the condition that the DOC can perform oxidation catalytic treatment on the exhaust gas normally and does not lose activity or even burn. And then, the DOC upstream temperature, the exhaust gas flow and the maximum fuel injection quantity are grouped correspondingly to generate a DOC maximum fuel injection quantity map, and the DOC maximum fuel injection quantity map is pre-stored in the ECU. The DOC maximum injection amount MAP may be configured as a MAP MAP.
In some embodiments of the present invention, the step of correcting the regeneration demand fuel injection amount based on the DOC flow uniformity map includes:
inquiring a DOC flow uniformity map according to the engine working condition signal to obtain a corresponding maximum uniformity coefficient;
and calculating the product of the maximum uniformity coefficient and the regeneration required fuel injection quantity.
Specifically, according to an engine working condition signal, such as exhaust gas flow, the exhaust gas flow is brought into a DOC flow uniformity map to obtain a maximum uniformity coefficient under the exhaust gas flow, and then the product of the maximum uniformity coefficient and the regeneration required oil injection quantity is calculated to obtain a corrected regeneration required oil injection quantity, wherein the corrected regeneration required oil injection quantity can reflect the maximum post-oil injection quantity distributed on the cross section of the DOC inlet.
In some embodiments of the present invention, the step of controlling the regenerated fuel injection amount of the DOC according to the numerical magnitude relation includes:
Controlling the DOC to carry out regeneration oil injection according to the regeneration requirement oil injection quantity according to the fact that the product of the maximum uniformity coefficient and the regeneration requirement oil injection quantity is smaller than or equal to the maximum oil injection quantity;
And controlling the DOC to carry out regeneration oil injection according to the maximum oil injection quantity according to the fact that the product of the maximum uniformity coefficient and the regeneration required oil injection quantity is larger than the maximum oil injection quantity.
It can be understood that when the product of the maximum uniformity coefficient and the regeneration required oil injection quantity is smaller than or equal to the maximum oil injection quantity, the regeneration required oil injection quantity can be reflected to not exceed the maximum oil injection quantity which can be born by the normal operation of the DOC, and oil injection can be performed according to the actually calculated regeneration required oil injection quantity at the moment, so that the oil injection quantity is in a proper range, and waste or accumulation of oil injection on the DOC caused by exceeding the oil injection quantity is avoided, and even a great amount of HC leakage is caused. The defect that the regeneration temperature of the DPF is insufficient and the particles attached to the DPF cannot be completely burnt to complete regeneration caused by too small oil injection amount can be avoided. When the product of the maximum uniformity coefficient and the regeneration required oil injection quantity is larger than the maximum oil injection quantity, the phenomenon that the regeneration required oil injection quantity possibly exceeds the maximum oil injection quantity which can be born by the normal operation of the DOC under the influence of the HC distribution characteristic before the DOC can be reflected, the oil injection quantity needs to be limited at the moment, the DOC is controlled to carry out regeneration oil injection according to the maximum oil injection quantity, the phenomenon that the oil injection quantity is too high, the redundant attachment of fuel is caused, and the cracking or partial ablation of the DOC carrier is formed due to the uneven temperature can be avoided.
In some embodiments of the invention, the plurality of test areas are distributed in a rectangular array.
Specifically, the radial cross section at the inlet of the DOC can be divided by a rectangular array, the radial cross section is divided into a plurality of test areas with similar areas by using equidistant grid lines, the flow test is performed on the test areas by using a flow probe to obtain the flow distribution characteristics of the test areas, and the step can be performed when the engine is calibrated.
The control steps of the regeneration control method of the aftertreatment system provided by the invention are as follows:
Firstly, in an engine test, a DOC inlet section is divided into n areas (for example, a grid is divided into 16 areas), uniformity coefficients of all areas behind the DOC under different exhaust gas flows are measured, the maximum uniformity coefficient under different flows is obtained, and a DOC flow uniformity map is obtained according to the flows and the maximum uniformity coefficient.
In the engine test, the maximum post-injection quantity which can be born by the DOC under each working condition (the temperature of the DOC upstream/the exhaust gas flow) is tested, and the maximum injection quantity Map is generated.
Furthermore, the DOC regeneration demand fuel injection quantity is calculated according to the existing strategy of the engine, and can be obtained by a fuel injection quantity calculation module.
Then, when the engine regenerates under a certain working condition, multiplying the DOC regeneration required oil injection quantity by the maximum uniformity coefficient to obtain the maximum post oil injection quantity distributed on the cross section of the DOC inlet, comparing the maximum post oil injection quantity with the maximum oil injection quantity, and if the maximum post oil injection quantity is less than or equal to the maximum oil injection quantity, continuing to inject according to the DOC regeneration required oil injection quantity; if the maximum post injection quantity is larger than the maximum injection quantity, injection is carried out according to the maximum injection quantity, and the excessive HC leakage is avoided.
A second aspect of the present invention proposes an aftertreatment system regeneration control device 40 for executing the aftertreatment system regeneration control method proposed according to the first aspect of the present invention, comprising:
An obtaining device 41, configured to obtain a DOC flow uniformity map and a DOC maximum fuel injection amount map;
The calculating device 42 is used for calculating the DOC regeneration requirement oil injection quantity and correcting the regeneration requirement oil injection quantity according to the DOC flow uniformity map;
the judging device 43 is configured to judge a magnitude relation between the corrected required oil injection amount and a corresponding maximum oil injection amount, where the maximum oil injection amount is a maximum oil injection amount corresponding to the corrected required oil injection amount in the DOC maximum oil injection amount map;
and a control device 44 for controlling the DOC regeneration fuel injection amount according to the judgment result of the judgment device 43.
It will be appreciated that the acquiring means 41 are individual sensors or probes provided on the engine, for example acquiring the individual temperatures of the aftertreatment system (DOC 10, DPF20, SCR 30) by means of temperature sensors, acquiring the exhaust gas flow by means of providing flow sensors, and testing the flow distribution characteristics of the DOC10 by means of providing flow probes. The calculation means 42 may be integrated with the ECU, receive the signal from the acquisition means 41 and calculate the corrected required fuel injection amount. The determination means 43 may also be integrated with the ECU, and the control logic for determining the regenerated fuel injection amount by determining the magnitude relation between the corrected required fuel injection amount and the corresponding maximum fuel injection amount. The control device 44 is electrically connected to the HC injection device 12 of the aftertreatment system, and controls the injection amount of the HC injection device 12 based on the determination result of the determination device 43.
According to the regeneration control device of the aftertreatment system, which is provided by the second aspect of the invention, an engine working condition signal, a pre-stored DOC flow uniformity map and a DOC maximum oil injection amount map are obtained through the obtaining device, after the required oil injection amount during DOC regeneration is calculated, the required oil injection amount is corrected according to the DOC flow uniformity map, and then the corrected required oil injection amount and the corresponding maximum oil injection amount in the DOC maximum oil injection amount map are judged, so that the regenerated oil injection amount of the DOC is controlled, and the problems of DOC high-temperature inactivation, ablation, HC massive leakage and the like are avoided.
A third aspect of the present invention proposes a vehicle comprising:
a post-processing system;
the aftertreatment system regeneration control device is provided in the second aspect of the present invention, and the aftertreatment system regeneration control device is configured to control a regeneration fuel injection amount of the aftertreatment system.
The vehicle according to the third aspect of the present invention has the same advantages as the aftertreatment system regeneration control device according to the second aspect of the present invention, and will not be described in detail herein.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. A method for controlling regeneration of an aftertreatment system, comprising the steps of:
Calculating the DOC regeneration demand fuel injection quantity;
calling a DOC flow uniformity map and a DOC maximum fuel injection amount map;
correcting the regeneration required oil injection quantity based on the DOC flow uniformity map;
inquiring the corresponding maximum oil injection quantity in the DOC maximum oil injection quantity map according to the corrected regeneration required oil injection quantity;
judging the numerical relation between the regeneration required oil injection quantity and the maximum oil injection quantity;
and controlling the regenerated fuel injection quantity of the DOC according to the numerical value size relation.
2. The aftertreatment system regeneration control method of claim 1, wherein the step of calculating the DOC regeneration demand fuel injection amount comprises:
receiving an engine working condition signal;
and calculating the DOC regeneration demand fuel injection quantity according to the engine working condition signal.
3. The aftertreatment system regeneration control method of claim 2, wherein the engine operating condition signal comprises at least one of a DPF upstream target temperature signal, a DOC upstream temperature signal, and an exhaust flow signal.
4. The aftertreatment system regeneration control method of claim 2, wherein the DOC flow uniformity map is obtained from an engine test in which a radial cross section at an inlet of the DOC is divided into a plurality of test regions, uniformity coefficients for the plurality of test regions are measured for different exhaust flows, and a maximum uniformity coefficient is obtained by comparison, and the DOC flow uniformity map is generated from the exhaust flow and the maximum uniformity coefficient.
5. The aftertreatment system regeneration control method of claim 4, wherein the DOC maximum injection amount map is obtained from an engine test in which the DOC maximum injection amount map is generated based on the DOC upstream temperature, the exhaust gas flow rate, and the maximum injection amount, by testing the DOC maximum injection amount that can be sustained during normal operation at different DOC upstream temperatures and different exhaust gas flow rates.
6. The aftertreatment system regeneration control method of claim 5, wherein the step of correcting the regeneration demand fuel injection amount based on the DOC flow uniformity map comprises:
Inquiring the DOC flow uniformity map according to the engine working condition signal to obtain a corresponding maximum uniformity coefficient;
And calculating the product of the maximum uniformity coefficient and the regeneration required oil injection quantity.
7. The aftertreatment system regeneration control method according to claim 6 wherein said step of controlling the amount of regenerated fuel injected to said DOC based on said numerical magnitude relationship comprises:
Controlling the DOC to carry out regeneration oil injection according to the regeneration required oil injection quantity according to the fact that the product of the maximum uniformity coefficient and the regeneration required oil injection quantity is smaller than or equal to the maximum oil injection quantity;
And controlling the DOC to carry out regeneration oil injection according to the maximum oil injection quantity according to the fact that the product of the maximum uniformity coefficient and the regeneration required oil injection quantity is larger than the maximum oil injection quantity.
8. The aftertreatment system regeneration control method of any of claims 4-7, wherein the plurality of test regions are distributed in a rectangular array.
9. An aftertreatment system regeneration control device for performing the aftertreatment system regeneration control method according to any one of claims 1 to 8, comprising:
the obtaining device is used for obtaining a DOC flow uniformity map and a DOC maximum oil injection amount map;
The computing device is used for computing the DOC regeneration demand oil injection quantity and correcting the regeneration demand oil injection quantity according to the DOC flow uniformity map;
The judging device is used for judging the magnitude relation between the corrected required oil injection quantity and the corresponding maximum oil injection quantity, wherein the maximum oil injection quantity is the corresponding maximum oil injection quantity of the corrected required oil injection quantity in the DOC maximum oil injection quantity map;
and the control device is used for controlling the regenerated fuel injection quantity of the DOC according to the judging result of the judging device.
10. A vehicle, characterized by comprising:
a post-processing system;
A post-processing system regeneration control device according to claim 9, for controlling a regeneration fuel injection amount of the post-processing system.
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