CN118049323A - Engine aftertreatment system and heating control method and device thereof - Google Patents
Engine aftertreatment system and heating control method and device thereof Download PDFInfo
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- CN118049323A CN118049323A CN202410317844.2A CN202410317844A CN118049323A CN 118049323 A CN118049323 A CN 118049323A CN 202410317844 A CN202410317844 A CN 202410317844A CN 118049323 A CN118049323 A CN 118049323A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 215
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000002347 injection Methods 0.000 claims abstract description 100
- 239000007924 injection Substances 0.000 claims abstract description 100
- 239000002826 coolant Substances 0.000 claims abstract description 72
- 238000005192 partition Methods 0.000 claims abstract description 46
- 239000000295 fuel oil Substances 0.000 claims abstract description 24
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 110
- 239000000446 fuel Substances 0.000 claims description 77
- 230000001276 controlling effect Effects 0.000 claims description 27
- 239000000110 cooling liquid Substances 0.000 claims description 21
- 239000003921 oil Substances 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 238000010790 dilution Methods 0.000 claims description 17
- 239000012895 dilution Substances 0.000 claims description 17
- 239000010705 motor oil Substances 0.000 claims description 14
- 230000003647 oxidation Effects 0.000 claims description 11
- 238000007254 oxidation reaction Methods 0.000 claims description 11
- 230000003197 catalytic effect Effects 0.000 claims description 10
- 230000002596 correlated effect Effects 0.000 claims description 8
- 238000009825 accumulation Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 239000002912 waste gas Substances 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 17
- 230000001976 improved effect Effects 0.000 description 9
- 230000008859 change Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 230000033228 biological regulation Effects 0.000 description 6
- 230000000875 corresponding effect Effects 0.000 description 6
- 238000005485 electric heating Methods 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 230000009977 dual effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 238000013459 approach Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D43/00—Conjoint electrical control of two or more functions, e.g. ignition, fuel-air mixture, recirculation, supercharging or exhaust-gas treatment
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D41/0245—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by increasing temperature of the exhaust gas leaving the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
- F02D41/405—Multiple injections with post injections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0414—Air temperature
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses an engine aftertreatment system and a heating control method and device thereof, wherein the method comprises the following steps: acquiring a preset partition threshold of at least two stages of thermal management measures; acquiring the temperature of engine coolant and the temperature of air intake of an SCR system at least one node; determining a target thermal management measure according to the temperature of engine coolant, the temperature of intake air and a preset partition threshold; and adjusting the working parameters of the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel oil operation according to the target heat management measures. According to the invention, by setting the hierarchical thermal management measures, different thermal management measures are matched based on actual working conditions, the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel oil are controlled in a partition mode, so that the temperature of waste gas is rapidly increased, and the emission, the temperature raising rate and the economy are considered.
Description
Technical Field
The invention relates to the technical field of engine tail gas aftertreatment control, in particular to an engine aftertreatment system and a heating control method and device thereof.
Background
A Selective Catalytic Reduction (SCR) system reduces nitrogen oxides (NOx) in exhaust gas to nitrogen (N 2) and water (H 2 O) by spraying a urea solution into the exhaust gas under the action of a catalyst. As engine emission standards become more stringent, for example, NOx emissions and PN emissions standards are increased, N 2 O emissions are newly increased, and at the same time, emission cycle test results become more of a vehicle test to be reformed, increasing SCR conversion efficiency is critical to meeting new emission requirements.
Because of the different activities of SCR catalysts at different temperatures, the prior art has generally provided electrical heating devices in exhaust aftertreatment systems to improve the performance of the exhaust aftertreatment systems at relatively low temperatures, especially during cold start phases of the engine. The existing electric heating device is usually arranged at the upstream of an oxidation catalyst or at the upstream of a Selective Catalytic Reduction (SCR) catalyst, and improves the catalytic performance of the SCR catalyst through continuous heating or intermittent heating, so that the problem that the temperature of tail gas is greatly influenced by air inlet and exhaust, the efficiency of simply improving the temperature of the tail gas by means of the heating device is low, the total power consumption of the system is large, and the economical efficiency is poor. In addition, tail gas heating requirements under different working conditions are different, and continuous heating or intermittent heating can cause energy waste caused by overheating or low SCR conversion efficiency caused by insufficient heating.
Disclosure of Invention
The invention provides an engine aftertreatment system and a heating control method and device thereof, which are used for solving the problems of low temperature adjustment precision, low temperature adjustment efficiency and high system power consumption of the existing tail gas aftertreatment heating device and can be used for rapidly improving the temperature of waste gas.
According to an aspect of the present invention, there is provided an engine aftertreatment system heating control method, the engine aftertreatment system including: an intake throttle valve, an exhaust throttle valve, a heating module, and an SCR system, the heating control method comprising:
Acquiring a preset partition threshold of at least two stages of thermal management measures;
acquiring the temperature of engine cooling liquid and the air inlet temperature of the SCR system at least one node;
determining a target thermal management measure according to the engine coolant temperature, the intake air temperature and the preset partition threshold;
And adjusting working parameters of the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel operation according to the target thermal management measure.
Optionally, the adjusting the operating parameters of the heating module, the intake throttle valve, the exhaust throttle valve, and the in-cylinder post-injection fuel operation according to the target thermal management measure includes: under a first target thermal management measure, controlling the heating module and the air inlet throttle valve to start, and closing the in-cylinder post-injection fuel operation; determining a first heating period and a first heating duty cycle of the heating module according to the first target thermal management measure; wherein the first heating duty cycle is inversely related to the engine coolant temperature; and adjusting the opening degree of the air inlet throttle valve according to the operation parameters of the engine.
Optionally, the adjusting the operating parameters of the heating module, the intake throttle valve, the exhaust throttle valve, and the in-cylinder post-injection fuel operation according to the target thermal management measure includes: under a second target heat management measure, controlling the heating module, the air inlet throttle valve and the in-cylinder post-injection fuel oil to operate and start; determining a second heating period and a second heating duty cycle of the heating module according to the second target thermal management measure; wherein the second heating duty cycle is inversely related to the engine coolant temperature; opening degree adjustment is carried out on the air inlet throttle valve according to the operation parameters of the engine; determining the fuel injection quantity of the in-cylinder post-injection fuel operation according to the first air inlet temperature of the SCR system at the air inlet side of the oxidation catalytic converter; wherein the fuel injection amount is positively correlated with the first intake air temperature.
Optionally, the adjusting the operating parameters of the heating module, the intake throttle valve, the exhaust throttle valve, and the in-cylinder post-injection fuel operation according to the target thermal management measure includes: under a third target thermal management measure, controlling the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel oil to operate and start; determining a third heating cycle and a third heating duty cycle of the heating module according to the third target thermal management measure; opening degree adjustment is carried out on the air inlet throttle valve and the air outlet throttle valve according to the operation parameters of the engine; determining the fuel injection quantity of the in-cylinder post-injection fuel operation according to the second air inlet temperature of the SCR system at the air inlet side of the oxidation catalytic converter; wherein the fuel injection amount is positively correlated with the second intake air temperature.
Optionally, the opening degree adjustment of the intake throttle valve and the exhaust throttle valve according to the operation parameter of the engine includes: and performing pressure closed-loop control on any one of the air inlet throttle valve or the exhaust throttle valve according to the operation parameters of the engine.
Optionally, the adjusting the operating parameters of the heating module, the intake throttle valve, the exhaust throttle valve, and the in-cylinder post-injection fuel operation according to the target thermal management measure includes: under a fourth target thermal management measure, controlling the heating module and the in-cylinder post-injection fuel to be closed, and controlling the air inlet throttle valve and the air outlet throttle valve to be started; the opening degree of the intake throttle valve and the exhaust throttle valve is adjusted based on an engine intake air temperature and/or an exhaust air temperature.
Optionally, the obtaining the preset partition threshold of the at least two levels of thermal management measures includes: establishing at least one coolant temperature threshold according to a first emission requirement of cold nitrogen oxides; at least one intake air temperature threshold is established based on at least one of a conversion efficiency, an engine fuel consumption, or a second emission requirement of nitrogen oxides of the SCR system.
Optionally, after the in-cylinder post-injection operation is started, the heating control method further includes: acquiring the accumulated oil injection quantity of the in-cylinder post-injection fuel oil operation; determining the dilution rate of engine oil according to the fuel injection accumulation amount; and determining whether to trigger an engine oil replacement alarm according to the engine oil dilution rate.
According to another aspect of the present invention, there is provided an engine aftertreatment system heating control device, the engine aftertreatment system including: an intake throttle valve, an exhaust throttle valve, a heating module, and an SCR system, the heating control device comprising: the threshold management module is used for acquiring preset partition thresholds of at least two levels of thermal management measures; the detection module is used for acquiring the temperature of engine cooling liquid and the air inlet temperature of the SCR system at least one node; the thermal management matching module is used for determining target thermal management measures according to the temperature of the engine cooling liquid, the inlet air temperature and the preset partition threshold value; and the thermal management execution module is used for adjusting the working parameters of the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel oil operation according to the target thermal management measure.
According to another aspect of the present invention, there is provided an engine aftertreatment system comprising: the air inlet throttle valve, the exhaust throttle valve, the heating module, the SCR system and the heating control device; the heating control device is configured to: acquiring a preset partition threshold of at least two stages of thermal management measures; acquiring the temperature of engine cooling liquid and the air inlet temperature of the SCR system at least one node; determining a target thermal management measure according to the engine coolant temperature, the intake air temperature and the preset partition threshold; and adjusting working parameters of the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel operation according to the target thermal management measure.
According to the technical scheme, the preset partition threshold value of at least two stages of thermal management measures is established, after the engine is electrified and operated, the temperature of engine cooling liquid and the air inlet temperature of an SCR system at least one node are obtained, target thermal management measures are determined according to the temperature of the engine cooling liquid, the air inlet temperature and the preset partition threshold value, working parameters of operation of a heating module, an air inlet throttle valve, an air outlet throttle valve and in-cylinder post-injection fuel are regulated according to the target thermal management measures, the problems that the temperature regulation precision and the temperature raising efficiency of an existing tail gas aftertreatment heating device are low and the system power consumption is high are solved, the hierarchical thermal management measures are set, and the heating module, the air inlet throttle valve, the air outlet throttle valve and in-cylinder post-injection fuel operation are matched based on different thermal management measures under actual working conditions, so that the exhaust temperature is rapidly improved, emission, the temperature raising rate and economy are considered, nitrogen oxide conversion efficiency is improved, and higher original nitrogen oxide emission and lower tail pipe nitrogen oxide emission can be realized.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an engine exhaust aftertreatment system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an SCR system according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for controlling heating of an engine aftertreatment system according to an embodiment of the present disclosure;
FIG. 4 is a flow chart of a method for controlling heating of an engine aftertreatment system under a first thermal management approach according to an embodiment of the present disclosure;
FIG. 5 is a flow chart of a method for controlling heating of an engine aftertreatment system under a second thermal management approach according to a first embodiment of the present disclosure;
FIG. 6 is a flow chart of a method for controlling heating of an engine aftertreatment system under a third thermal management action provided in accordance with an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of an intake throttle and exhaust throttle operating region according to a first embodiment of the present invention;
FIG. 8 is a flow chart of a method for controlling heating of an engine aftertreatment system under a fourth thermal management action provided in accordance with an embodiment of the present disclosure;
FIG. 9 is a flow chart of another engine aftertreatment system heating control method provided in accordance with an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a heating control device of an engine aftertreatment system according to a second embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of an engine exhaust aftertreatment system according to an embodiment of the present application. Referring to fig. 1, the engine exhaust aftertreatment system of the application includes: an intake throttle 201, an exhaust throttle 202, a heating module 203, and an SCR system 204. Wherein the intake throttle 201 is provided between the intake pipe and the intake port of the engine E0, and the engine intake air amount and the output power are adjusted by adjusting the opening of the intake throttle 201, for example, the smaller the opening of the intake throttle 201, the smaller the engine intake air amount; the exhaust throttle valve 202 is provided between the exhaust port of the engine E0 and the intake side of the heating module 203, and the engine exhaust amount and the exhaust pressure are adjusted by adjusting the opening degree of the exhaust throttle valve 202, for example, the smaller the opening degree of the exhaust throttle valve 202, the smaller the engine exhaust amount; the exhaust side of the heating module 203 is connected to the intake side of the SCR system 204, and the exhaust side of the SCR system 204 is connected to the exhaust line. The heating module 203 of the present application may be an electric heating exhaust pipe with a built-in heating sheet, the diameter of the electric heating exhaust pipe is similar to that of the exhaust pipeline, and the heating module 203 is heated by an external 24V power supply for increasing the temperature of the exhaust gas.
The SCR system of the present application may be a single SCR system or a dual SCR system. Fig. 2 is a schematic structural diagram of an SCR system according to an embodiment of the present application. Referring to fig. 2, a dual SCR system is taken as an example, and includes: ccSCR assemblies (i.e., close-coupled SCR assemblies) 2041, oxidation catalytic converter DOC (diesel oxide catalyst) 2042, particulate trap DPF (diesel particulate filter) 2043, and post-SCR assembly 2044, connected in sequence. Wherein, ccSCR assembly 2041 includes close-coupled SCR and Ammonia slip trap (ASC for short) and post-SCR assembly 2044 includes SCR and Ammonia slip trap ASC, SCR is used for injecting urea before SCR to reduce nitrogen oxides in exhaust emissions, SCR is located far from turbine; the ammonia escape trap ASC is used for oxidizing the redundant ammonia gas; the DOC is arranged in front of the DPF and is used for converting NO in the tail gas into NO2, and meanwhile, the temperature of the waste gas is raised to assist the normal operation of the DPF and the SCR; the particulate matter trap DPF is used for trapping the particulate matters in the tail gas, and when the trapped particulate matters reach a certain level, passive regeneration or active regeneration is required, so that the trapping capacity of the DPF on the particulate matters is recovered.
Referring to the figures 1 and 2, the application provides a heating control method of an engine aftertreatment system, which aims at the engine and the exhaust aftertreatment system of an electrified heating device, and the method can quickly improve the temperature of exhaust gas by optimizing a thermal management measure, solves the problems of low temperature adjustment precision and temperature improvement efficiency and high system power consumption of the existing exhaust aftertreatment heating device, and can meet the requirements of national seventh emission regulations. It should be understood that the heating control method provided by the application can be applied to single-SCR systems or double-SCR system application scenarios.
Example 1
Fig. 3 is a flowchart of a heating control method for an engine aftertreatment system according to an embodiment of the present invention, and referring to fig. 1 and 2, an exhaust aftertreatment system of an engine may be an SCR system, and an EGR system is not configured. The method may be performed by an engine aftertreatment system heating control device, which may be implemented in hardware and/or software, which may be configured in an engine exhaust aftertreatment system.
Referring to fig. 1 to 3, the engine aftertreatment system heating control method of the application specifically includes the steps of:
s1: and acquiring a preset partition threshold of at least two stages of thermal management measures.
Among them, thermal management means a method for adjusting the temperature of exhaust gas. In this embodiment, the thermal management measures are implemented based on at least one of the following: an intake throttle 201, an exhaust throttle 202, and a heating module 203.
The preset partition threshold represents a critical threshold for distinguishing between the zones in which different thermal management measures are located. In this embodiment, the preset partition threshold includes, but is not limited to: at least one of a coolant temperature threshold or an intake air temperature threshold.
S2: the engine coolant temperature and the SCR system inlet air temperature at least one node are obtained.
The temperature of the engine cooling liquid is the temperature of the engine water collected by the engine ECU.
In this embodiment, referring to fig. 2, taking a dual SCR system as an example, temperature sensors may be respectively disposed on the air inlet side of the ccSCR assembly 2041, the air inlet side of the oxidation catalyst converter DOC, the air inlet side of the particulate matter trap DPF, and the air inlet side of the post SCR assembly 2044 to collect the air inlet temperatures of the corresponding nodes.
S3: and determining target thermal management measures according to the temperature of engine cooling liquid, the temperature of intake air and the preset partition threshold value.
The target thermal management measures are any thermal management measures determined according to the matching result of the engine coolant temperature, the intake air temperature and the preset partition threshold.
In some embodiments, in a single SCR system, thermal management measures matching is performed based on engine coolant temperature and intake air temperature of the SCR intake side. In other embodiments, in a dual SCR system, thermal management measures are matched based on engine coolant temperature and intake air temperature of the intake side of the post-SCR assembly 2044.
Specifically, taking an example that the preset partition threshold includes a coolant temperature threshold and an air intake temperature threshold, comparing the engine coolant temperature with the coolant temperature threshold, simultaneously comparing the air intake temperature with the air intake temperature threshold, determining a parameter interval corresponding to the current engine coolant temperature and the air intake temperature according to a comparison result, and determining a thermal management measure corresponding to the parameter interval as a target thermal management measure.
S4: and adjusting the working parameters of the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel oil operation according to the target heat management measures.
Among the operating parameters include, but are not limited to: at least one of a heating cycle, heating power or heating duty ratio of the heating module, an intake throttle opening, an exhaust throttle opening, and an amount of fuel injection for in-cylinder post-injection fuel operation.
In this embodiment, under different thermal management measures, the operating parameters of the heating module, the intake throttle valve, the exhaust throttle valve, and the in-cylinder post-injection fuel operation may be set to different values, and specific values thereof are not limited. The working parameters under different thermal management measures can be established through calibration, the corresponding working parameters are stored in the engine ECU, and the engine ECU controls the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel operation according to the actually matched target thermal management measures.
Illustratively, the preset partition threshold comprises: two coolant temperature thresholds (e.g., a first coolant temperature threshold of 50 ℃, a second coolant temperature threshold of 70 ℃) and two intake air temperature thresholds (e.g., a first intake air temperature threshold of 200 ℃, a second intake air temperature threshold of 250 ℃) are exemplified, the first coolant temperature threshold, the second coolant temperature threshold, the first intake air temperature threshold, and the second intake air temperature threshold being critical thresholds for different thermal management measures, respectively: if the engine coolant temperature is below a first coolant temperature threshold (e.g., 50 ℃), then matching a first thermal management measure, the first thermal management measure being a thermal management measure at an initial stage of cold start; if the engine coolant temperature is greater than or equal to the first coolant temperature threshold (e.g., 50 ℃) and less than the second coolant temperature threshold (e.g., 70 ℃), then a second thermal management measure is matched, the second thermal management measure being a thermal management measure in which the cold start is operated for a specified time and the aftertreatment system is in a cold nitrogen oxide emission phase; if the engine coolant temperature is greater than or equal to the second coolant temperature threshold (e.g., 70 ℃) and the intake air temperature is less than the first intake air temperature threshold (e.g., 200 ℃), then a third thermal management measure is matched; if the engine coolant temperature is greater than or equal to the second coolant temperature threshold (e.g., 70 ℃), the intake air temperature is greater than or equal to the first intake air temperature threshold (e.g., 200 ℃) and less than the second intake air temperature threshold (e.g., 250 ℃), then a fourth thermal management measure is matched; if the engine coolant temperature is greater than or equal to a second coolant temperature threshold (e.g., 70 ℃) and the intake air temperature is greater than or equal to a second intake air temperature threshold (e.g., 250 ℃), the thermal management control strategy is exited. Under different thermal management measures, the heating power of the heating device gradually decreases as the intake air temperature and the engine coolant temperature increase. By establishing the hierarchical thermal management measures and matching different thermal management measures based on actual working conditions, the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel operation are controlled in a partitioning mode, so that the temperature of waste gas is improved rapidly, emission, temperature raising rate and economy are considered, the conversion efficiency of nitrogen oxides is improved, and higher original emission of nitrogen oxides and lower emission of tail pipe nitrogen oxides can be realized.
In some embodiments, obtaining a preset partition threshold for at least two levels of thermal management measures includes: establishing at least one coolant temperature threshold according to a first emission requirement of cold nitrogen oxides; at least one intake air temperature threshold is established based on at least one of a conversion efficiency of the SCR system, an engine fuel consumption, or a second emission requirement of nitrogen oxides. Wherein the first emission requirement of cold nitrogen oxides represents the nitrogen oxide emission regulation requirement of the engine at the cold start stage during the emission cycle test. The second emission requirement of nitrogen oxides represents the emission regulation requirement of tailpipe nitrogen oxides in the low temperature operating state of the engine. Typically, the first emission requirement, the conversion efficiency of the SCR system, the fuel consumption, and the second emission requirement of the nitrogen oxides may be values established based on the national seventh emission regulation calibration, and the specific values thereof are not limited. In the present embodiment, the intake air temperature threshold value is greater than the coolant temperature threshold value. The method has the advantages that the interval threshold values of different thermal management measures are configured based on the emission regulation requirements, the electric heating device, the in-cylinder post-injection fuel oil, the air inlet throttle valve and the air outlet throttle valve are controlled in intervals under different working conditions, the suitability of the post-treatment system for different working conditions is improved, the temperature of exhaust gas can be quickly increased, and the temperature rising speed is increased along with the continuous rising of the post-treatment temperature and the fuel oil injection mode; on the other hand, the total power consumption of the system is reduced, and the waste gas heating efficiency is improved.
Fig. 4 is a flowchart of a heating control method of an engine aftertreatment system under a first thermal management measure according to an embodiment of the invention. In the present embodiment, the first thermal management measure is a thermal management measure in the initial stage of cold start.
Referring to fig. 4, the heating control method specifically includes the steps of:
s401: and acquiring a preset partition threshold of at least two stages of thermal management measures.
S402: the engine coolant temperature and the SCR system inlet air temperature at least one node are obtained.
S403: and determining target thermal management measures according to the temperature of engine cooling liquid, the temperature of intake air and the preset partition threshold value.
S404: under the first target thermal management measure, the heating module and the intake throttle valve are controlled to be started, and the in-cylinder post-injection fuel operation is closed.
Wherein the first target thermal management measure is a thermal management measure (i.e., a first thermal management measure) of the cold start initial stage.
S405: a first heating cycle and a first heating duty cycle of the heating module are determined according to a first target thermal management measure.
In this embodiment, the first heating duty cycle is inversely related to the engine coolant temperature, i.e., the higher the engine coolant temperature, the lower the second heating duty cycle. Illustratively, the first heating duty cycle may be any value greater than or equal to 80% and less than or equal to 90%.
In some embodiments, the first heating period may be inversely related to the engine coolant temperature, i.e., the higher the engine coolant temperature, the shorter the first heating period. In other embodiments, the first heating period may be set to a fixed value. For example, the first heating period may be set to 60 seconds.
S406: and adjusting the opening of the air inlet throttle valve according to the operation parameters of the engine.
In the present embodiment, the operating parameters of the engine include, but are not limited to, engine speed and output torque. The intake throttle opening is determined based on the rotational speed and torque to ensure that the engine output remains constant.
Specifically, the preset partition threshold in this embodiment at least includes: when the engine coolant temperature is lower than the first coolant temperature threshold (e.g., 50 ℃), the engine ECU controls the heating module to start heating, and drives the heating module to heat the exhaust gas with a first heating period (e.g., 60 seconds) and a first heating duty cycle (e.g., 80%), which operates at a larger value, while opening the intake throttle valve to reduce the amount of intake air. In the initial stage of cold start, through high-power heating cooperation reduction air input, be favorable to promoting the aftertreatment temperature fast, improve waste gas heating efficiency.
FIG. 5 is a flow chart of a method for controlling heating of an engine aftertreatment system under a second thermal management approach according to an embodiment of the present disclosure. In this embodiment, the second thermal management is a cold start operation for a specific time, and the aftertreatment system is in a cold NOx emission phase.
Referring to fig. 5, the heating control method specifically includes the steps of:
S501: and acquiring a preset partition threshold of at least two stages of thermal management measures.
S502: the engine coolant temperature and the SCR system inlet air temperature at least one node are obtained.
S503: and determining target thermal management measures according to the temperature of engine cooling liquid, the temperature of intake air and the preset partition threshold value.
S504: and under the second target heat management measure, controlling the heating module, the air inlet throttle valve and the in-cylinder post-injection fuel oil to operate and start.
Wherein the second target thermal management is a thermal management (i.e., a second thermal management) during which the cold start is operating for a specified time and the aftertreatment system is in a cold NOx emission phase.
S505: a second heating cycle and a second heating duty cycle of the heating module are determined according to a second target thermal management measure.
In this embodiment, the second heating duty cycle is inversely related to the engine coolant temperature, i.e., the higher the engine coolant temperature, the lower the second heating duty cycle. Illustratively, the second heating duty cycle may be any value greater than 40% and less than or equal to 60%.
In some embodiments, the second heating period may be inversely related to the engine coolant temperature, i.e., the higher the engine coolant temperature, the shorter the second heating period. In other embodiments, the second heating period may be set to a fixed value. For example, the second heating period may be set to 60 seconds.
S506: and adjusting the opening of the air inlet throttle valve according to the operation parameters of the engine.
In the present embodiment, the operating parameters of the engine include, but are not limited to, engine speed and output torque. The intake throttle opening is determined based on the rotational speed and torque to ensure that the engine output remains constant.
S507: and determining the fuel injection quantity of the in-cylinder post-injection fuel operation according to the first air inlet temperature of the SCR system on the air inlet side of the oxidation catalytic converter. Wherein the injection amount is positively correlated with the first intake air temperature.
In the embodiment, the fuel injection quantity of the in-cylinder post-injection fuel operation is determined according to the first air inlet temperature of the DOC air inlet side, and a small amount of fuel is added when the first air inlet temperature value is low, so that the unburned fuel is prevented from being unable to ignite in the DOC and accumulated in the DPF to cause abnormal temperature rise; when the first air inlet temperature value is higher, the fuel injection quantity can be increased, and the temperature can be quickly increased.
Specifically, the preset partition threshold in this embodiment at least includes: the engine ECU controls the heating module to be activated when the engine coolant temperature is higher than the first coolant temperature threshold (e.g., 50 ℃) but lower than the second coolant temperature threshold (e.g., 70 ℃) and drives the heating module to heat the exhaust gas at a second heating period (e.g., 60 seconds) and a second heating duty cycle (e.g., any value greater than 40% and less than or equal to 60%) to rapidly raise the aftertreatment temperature. Meanwhile, the heating power is increased by means of fuel oil back-spraying in the cylinder. After the temperature of the air inlet and the temperature of the engine cooling liquid rise, the heating power of the heating module is properly regulated, the air inlet throttle valve is matched to reduce the air inlet, and meanwhile, the temperature rising rate and the system power economy are considered by introducing the fuel oil after being injected into the electric heating auxiliary cylinder.
FIG. 6 is a flow chart of a method for controlling heating of an engine aftertreatment system under a third thermal management action according to an embodiment of the present disclosure. In this embodiment, the third thermal management is a thermal management during which the aftertreatment system is operating in a low NOx conversion efficiency stage. Typically, low nitrogen oxide conversion efficiency means nitrogen oxide conversion efficiency below 90%.
Referring to fig. 6, the heating control method specifically includes the steps of:
s601: and acquiring a preset partition threshold of at least two stages of thermal management measures.
S602: the engine coolant temperature and the SCR system inlet air temperature at least one node are obtained.
S603: and determining target thermal management measures according to the temperature of engine cooling liquid, the temperature of intake air and the preset partition threshold value.
S604: and under the third target heat management measure, controlling the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel oil to operate and start.
Wherein the third target thermal management is a thermal management of the aftertreatment system operating at a low NOx conversion efficiency stage (i.e., a third thermal management).
S605: a third heating cycle and a third heating duty cycle of the heating module are determined according to a third target thermal management measure.
In the present embodiment, the value of the third heating duty ratio is low. For example, the third heating duty cycle may be set to 40%. The third heating period may be set to a fixed value (e.g., 60 seconds).
S606: and opening degree adjustment is carried out on the air inlet throttle valve and the air outlet throttle valve according to the operation parameters of the engine.
Optionally, the opening degree adjustment of the intake throttle valve and the exhaust throttle valve according to the operation parameters of the engine includes: the closed-loop control of pressure is performed on either the intake throttle valve or the exhaust throttle valve according to an operating parameter of the engine. In the present embodiment, the operating parameters of the engine include, but are not limited to: engine speed and engine output torque. The opening of the air inlet throttle valve is determined according to the rotating speed and the torque, the opening of the exhaust throttle valve is determined according to the rotating speed and the torque, and under different working conditions, the adjusting targets of the air inlet throttle valve and the exhaust throttle valve are different.
Fig. 7 is a schematic diagram of an intake throttle valve and an exhaust throttle valve in an action area according to a first embodiment of the present invention. Referring to FIG. 7, in region I, where engine speed is relatively low and torque is relatively low, the intake throttle valve is closed loop controlled to maintain a constant or nearly constant engine intake pressure; in zone ii, where engine speed and torque are relatively high, the exhaust throttle valve is closed loop controlled for exhaust pressure to maintain the engine exhaust pressure constant or approximately constant.
S607: and determining the fuel injection quantity of the in-cylinder post-injection fuel operation according to the second air inlet temperature of the SCR system on the air inlet side of the oxidation catalytic converter. Wherein the fuel injection amount is positively correlated with the second intake air temperature.
In the embodiment, the fuel injection quantity of the in-cylinder post-injection fuel operation is determined according to the second air intake temperature of the air intake side of the DOC, and a small amount of fuel is added when the value of the second air intake temperature is lower, so that the unburned fuel is prevented from being unable to ignite in the DOC and accumulated in the DPF to cause abnormal temperature rise; and when the value of the second air inlet temperature is higher, the fuel injection quantity can be increased, and the temperature is quickly increased for the rear-stage SCR.
Specifically, the preset partition threshold in this embodiment at least includes: a second coolant temperature threshold (e.g., 70 ℃) and a first intake air temperature threshold (e.g., 200 ℃). When the temperature of the engine coolant is higher than a second coolant temperature threshold (for example, 70 ℃), and the temperature of the air intake of the SCR is lower than a first air intake temperature threshold (for example, 200 ℃), the engine ECU drives the heating module to continuously heat at a third heating period (for example, 60 seconds) and a third heating duty cycle (for example, 40%), so that the aftertreatment temperature is quickly raised; meanwhile, the operation start of post-spraying fuel oil in the cylinder is controlled, the heating power is increased, and the temperature is quickly increased for the post-stage SCR; simultaneously, the ECU of the engine controls the opening of the air inlet throttle valve and the air outlet throttle valve, the opening of the air inlet throttle valve is regulated according to the rotation speed and the torque, and the opening of the air outlet throttle valve is regulated according to the rotation speed and the torque, and under the working conditions of low rotation speed and small torque of the engine, the air inlet throttle valve is subjected to closed-loop control of air inlet pressure; the engine speed and torque are relatively high, and exhaust pressure closed-loop control is performed on the exhaust throttle valve. In the low nitrogen oxide conversion efficiency stage, through the mutual cooperation of heating module, air inlet throttle valve, exhaust throttle valve and in-cylinder post-injection fuel oil operation, increase heating power, promote temperature for the rear SCR fast, compromise emission, temperature rising rate and economic nature.
FIG. 8 is a flow chart of a method for controlling heating of an engine aftertreatment system under a fourth thermal management action according to an embodiment of the present disclosure. In this embodiment, the fourth thermal management is a thermal management during which the aftertreatment system is operating in a high NOx conversion efficiency stage. Typically, high nitrogen oxide conversion efficiency means a nitrogen oxide conversion efficiency of greater than or equal to 95%.
Referring to fig. 8, the heating control method specifically includes the steps of:
S801: and acquiring a preset partition threshold of at least two stages of thermal management measures.
S802: the engine coolant temperature and the SCR system inlet air temperature at least one node are obtained.
S803: and determining target thermal management measures according to the temperature of engine cooling liquid, the temperature of intake air and the preset partition threshold value.
S804: under the fourth target thermal management measure, the heating module and the in-cylinder post-injection fuel operation are controlled to be closed, and the intake throttle valve and the exhaust throttle valve are controlled to be started.
The fourth target thermal management measure is a thermal management measure (i.e., a fourth thermal management measure) of the aftertreatment system operating in a high nox conversion efficiency stage.
S805: the opening degree of the intake throttle valve and the exhaust throttle valve is adjusted based on the engine intake air temperature and/or the exhaust air temperature.
In this embodiment, the intake throttle valve is used to achieve idle speed thermal insulation, and the exhaust throttle valve is used to achieve rapid temperature rise.
Specifically, the preset partition threshold in this embodiment at least includes: a second coolant temperature threshold (e.g., 70 ℃), a first intake air temperature threshold (e.g., 200 ℃) and a second intake air temperature threshold (e.g., 250 ℃). The engine ECU controls the heating module and the in-cylinder post-injection fuel operation to be turned off when the engine coolant temperature is higher than a second coolant temperature threshold (e.g., 70 ℃) and the intake air temperature on the intake side of the SCR (or ccSCR) is greater than a first intake air temperature threshold (e.g., 200 ℃) and less than a second intake air temperature threshold (e.g., 250 ℃). The temperature adjustment is achieved by adjusting the opening degrees of the intake throttle valve and the exhaust throttle valve. The idling heat preservation is realized through the air inlet throttle valve, the rapid temperature rising is realized through the air outlet throttle valve, the energy waste caused by overheating of the heating module is avoided, and the system economy is provided.
Optionally, the opening degree adjustment of the intake throttle valve and the exhaust throttle valve according to the operation parameters of the engine includes: the closed-loop control of pressure is performed on either the intake throttle valve or the exhaust throttle valve according to an operating parameter of the engine. In the present embodiment, the operating parameters of the engine include, but are not limited to: engine speed and engine output torque. The opening degree of the intake throttle valve is determined in accordance with the rotation speed and the torque, and, while adjusting the intake air amount,
In this embodiment, the thermal management control strategy is exited when the engine coolant temperature is greater than a second coolant temperature threshold (e.g., 70 ℃) and the intake air temperature of the intake side of the SCR (or ccSCR) is greater than the second intake air temperature threshold (e.g., 250 ℃).
Fig. 9 is a flowchart of another heating control method for an engine aftertreatment system according to an embodiment of the present invention, and referring to fig. 9, the heating control method specifically includes:
s901: and acquiring a preset partition threshold of at least two stages of thermal management measures.
S902: the engine coolant temperature and the SCR system inlet air temperature at least one node are obtained.
S903: and determining target thermal management measures according to the temperature of engine cooling liquid, the temperature of intake air and the preset partition threshold value.
S904: and adjusting the working parameters of the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel oil operation according to the target heat management measures.
S905: after the in-cylinder post-injection operation is started, the fuel injection accumulation amount of the in-cylinder post-injection operation is acquired.
Wherein, the fuel injection accumulation amount represents the total fuel injection amount from the starting time to the sampling time of the in-cylinder post-injection fuel operation.
S906: and determining the engine oil dilution rate according to the fuel injection accumulation amount.
Wherein, the oil dilution rate is equal to the ratio between the accumulated amount of oil injection and the preset oil change mileage (for example, 2000 km).
S907: and determining whether to trigger an oil replacement alarm according to the oil dilution rate.
In this embodiment, a preset dilution rate threshold value in a single oil change mileage can be established through calibration, the oil dilution rate and the preset dilution rate threshold value are compared, and whether to trigger an oil change alarm is determined according to the comparison result.
In this embodiment, the oil change alarm may be displayed through the vehicle end instrument desk or a remote terminal device (e.g., a mobile phone or a computer device). The specific form of the oil change alarm is not limited.
Specifically, after the in-cylinder post-injection operation is started, the fuel injected in the engine cylinder is subjected to real-time statistical calculation to obtain the fuel injection accumulation amount. Then, the accumulated oil injection amount is calculated and divided by a preset oil change mileage (for example, 3000 km) to obtain a dilution rate, and when the oil dilution rate exceeds a preset dilution rate threshold value in one oil change mileage, an oil change alarm is triggered to send to a whole vehicle instrument or terminal equipment to remind a customer of changing the oil. By counting the oil injection quantity, the engine oil dilution rate is calculated in real time, a client is timely reminded of replacing engine oil, the engine oil dilution is prevented from influencing the operation of an engine, and the reliability of a system is improved.
Example two
Based on the same inventive concept, the second embodiment of the invention provides a heating control device for an engine aftertreatment system, which can execute the heating control method for the engine aftertreatment system provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Fig. 10 is a schematic structural diagram of a heating control device of an engine aftertreatment system according to a second embodiment of the present invention. As shown in fig. 10, the engine aftertreatment system heating control device includes: a threshold management module 101, a detection module 102, a thermal management matching module 103, and a thermal management execution module 104.
The threshold management module 101 is configured to obtain a preset partition threshold of at least two levels of thermal management measures; the detection module 102 is used for acquiring the temperature of engine cooling liquid and the temperature of air intake of the SCR system at least one node; a thermal management matching module 103 for determining a target thermal management measure based on the engine coolant temperature, the intake air temperature, and a preset zone threshold; the thermal management execution module 104 is configured to adjust operating parameters of the heating module, the intake throttle valve, the exhaust throttle valve, and the in-cylinder post-injection fuel operation according to the target thermal management measure.
Optionally, thermal management execution module 104 is configured to: under the first target thermal management measure, controlling the heating module and the air inlet throttle valve to start, and closing the in-cylinder post-injection fuel oil operation; determining a first heating period and a first heating duty cycle of the heating module according to a first target thermal management measure; wherein the first heating duty cycle is inversely related to the engine coolant temperature; and adjusting the opening of the air inlet throttle valve according to the operation parameters of the engine.
Optionally, thermal management execution module 104 is configured to: under the second target heat management measure, controlling the heating module, the air inlet throttle valve and the in-cylinder post-injection fuel oil to operate and start; determining a second heating period and a second heating duty cycle of the heating module according to a second target thermal management measure; wherein the second heating duty cycle is inversely related to the engine coolant temperature; opening degree adjustment is carried out on the air inlet throttle valve according to the operation parameters of the engine; determining the fuel injection quantity of the in-cylinder post-injection fuel operation according to the first air inlet temperature of the SCR system at the air inlet side of the oxidation catalytic converter; wherein the injection amount is positively correlated with the first intake air temperature.
Optionally, thermal management execution module 104 is configured to: under the third target heat management measure, controlling the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel oil to operate and start; determining a third heating period and a third heating duty cycle of the heating module according to a third target thermal management measure; opening adjustment is carried out on the air inlet throttle valve and the air outlet throttle valve according to the operation parameters of the engine; determining the fuel injection quantity of the in-cylinder post-injection fuel operation according to the second air inlet temperature of the SCR system on the air inlet side of the oxidation catalytic converter; wherein the fuel injection amount is positively correlated with the second intake air temperature.
Optionally, the thermal management execution module 104 is further configured to: under a third target thermal management measure, pressure closed-loop control is performed on any one of the intake throttle valve or the exhaust throttle valve according to an operating parameter of the engine.
Optionally, the thermal management execution module 104 is further configured to: under the fourth target heat management measure, controlling the heating module and the in-cylinder post-injection fuel to be closed, and controlling the air inlet throttle valve and the air outlet throttle valve to be started; the opening degree of the intake throttle valve and the exhaust throttle valve is adjusted based on the engine intake air temperature and/or the exhaust air temperature.
Optionally, the threshold management module 101 is configured to: establishing at least one coolant temperature threshold according to a first emission requirement of cold nitrogen oxides; at least one intake air temperature threshold is established based on at least one of a conversion efficiency, fuel consumption, or a second emission requirement of nitrogen oxides of the SCR system.
In some embodiments, the engine aftertreatment system heating control device of the present disclosure further comprises: and the engine oil alarm module is used for acquiring the accumulated oil injection quantity of the in-cylinder post-injection operation, determining the engine oil dilution rate according to the accumulated oil injection quantity, and determining whether to trigger an engine oil replacement alarm according to the engine oil dilution rate.
According to the heating control device of the engine aftertreatment system, a threshold management module, a detection module, a thermal management matching module and a thermal management execution module are arranged, and the threshold management module establishes a preset partition threshold of at least two-stage thermal management measures; after the engine is electrified and operated, a detection module obtains the temperature of engine cooling liquid and the temperature of air intake of an SCR system at least one node; the thermal management matching module determines target thermal management measures according to the temperature of engine cooling liquid, the temperature of air inlet and a preset partition threshold value; the thermal management execution module adjusts the working parameters of the heating module, the air inlet throttle valve, the exhaust throttle valve and the in-cylinder post-spraying fuel operation according to target thermal management measures, solves the problems of low temperature adjustment precision, low temperature raising efficiency and high system power consumption of the existing tail gas post-treatment heating device, and can realize higher nitrogen oxide raw emission and lower tail pipe nitrogen oxide emission by setting hierarchical thermal management measures, matching different thermal management measures based on actual working conditions, and controlling the heating module, the air inlet throttle valve, the exhaust throttle valve and the in-cylinder post-spraying fuel operation in a partitioning manner, so that the temperature of the waste gas is quickly improved, the emission, the temperature raising rate and the economy are both considered, the nitrogen oxide conversion efficiency is improved, and the higher nitrogen oxide raw emission and the lower tail pipe nitrogen oxide emission can be realized.
Example III
Based on the same inventive concept, the present invention provides an engine aftertreatment system comprising: an intake throttle valve, an exhaust throttle valve, a heating module, an SCR system, and a heating control device provided by the above embodiments. The heating control device of the present embodiment is configured at least to: acquiring a preset partition threshold of at least two stages of thermal management measures; acquiring the temperature of engine coolant and the temperature of air intake of an SCR system at least one node; determining a target thermal management measure according to the temperature of engine coolant, the temperature of intake air and a preset partition threshold; and adjusting the working parameters of the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel oil operation according to the target heat management measures.
The engine aftertreatment system provided by the embodiment of the invention comprises the heating control device provided by the embodiment, and has the corresponding functional modules and beneficial effects of the heating control device, and the same parts are not repeated.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method of engine aftertreatment system heating control, the engine aftertreatment system comprising: the heating control method comprises the following steps of:
Acquiring a preset partition threshold of at least two stages of thermal management measures;
acquiring the temperature of engine cooling liquid and the air inlet temperature of the SCR system at least one node;
determining a target thermal management measure according to the engine coolant temperature, the intake air temperature and the preset partition threshold;
And adjusting working parameters of the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel operation according to the target thermal management measure.
2. The engine aftertreatment system heating control method according to claim 1 wherein said adjusting operating parameters of said heating module, said intake throttle, said exhaust throttle, and in-cylinder post-injection fuel operations according to said target thermal management measure comprises:
under a first target thermal management measure, controlling the heating module and the air inlet throttle valve to start, and closing the in-cylinder post-injection fuel operation;
determining a first heating period and a first heating duty cycle of the heating module according to the first target thermal management measure; wherein the first heating duty cycle is inversely related to the engine coolant temperature;
and adjusting the opening degree of the air inlet throttle valve according to the operation parameters of the engine.
3. The engine aftertreatment system heating control method according to claim 1 wherein said adjusting operating parameters of said heating module, said intake throttle, said exhaust throttle, and in-cylinder post-injection fuel operations according to said target thermal management measure comprises:
Under a second target heat management measure, controlling the heating module, the air inlet throttle valve and the in-cylinder post-injection fuel oil to operate and start;
Determining a second heating period and a second heating duty cycle of the heating module according to the second target thermal management measure; wherein the second heating duty cycle is inversely related to the engine coolant temperature;
opening degree adjustment is carried out on the air inlet throttle valve according to the operation parameters of the engine;
determining the fuel injection quantity of the in-cylinder post-injection fuel operation according to the first air inlet temperature of the SCR system at the air inlet side of the oxidation catalytic converter; wherein the fuel injection amount is positively correlated with the first intake air temperature.
4. The engine aftertreatment system heating control method according to claim 1 wherein said adjusting operating parameters of said heating module, said intake throttle, said exhaust throttle, and in-cylinder post-injection fuel operations according to said target thermal management measure comprises:
Under a third target thermal management measure, controlling the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel oil to operate and start;
determining a third heating cycle and a third heating duty cycle of the heating module according to the third target thermal management measure;
opening degree adjustment is carried out on the air inlet throttle valve and the air outlet throttle valve according to the operation parameters of the engine;
Determining the fuel injection quantity of the in-cylinder post-injection fuel operation according to the second air inlet temperature of the SCR system at the air inlet side of the oxidation catalytic converter; wherein the fuel injection amount is positively correlated with the second intake air temperature.
5. The engine aftertreatment system heating control method according to claim 4 wherein opening degree adjustment of the intake throttle valve and the exhaust throttle valve according to an operating parameter of the engine comprises:
And performing pressure closed-loop control on any one of the air inlet throttle valve or the exhaust throttle valve according to the operation parameters of the engine.
6. The engine aftertreatment system heating control method according to claim 1 wherein said adjusting operating parameters of said heating module, said intake throttle, said exhaust throttle, and in-cylinder post-injection fuel operations according to said target thermal management measure comprises:
under a fourth target thermal management measure, controlling the heating module and the in-cylinder post-injection fuel to be closed, and controlling the air inlet throttle valve and the air outlet throttle valve to be started;
The opening degree of the intake throttle valve and the exhaust throttle valve is adjusted based on an engine intake air temperature and/or an exhaust air temperature.
7. The engine aftertreatment system heating control method according to any one of claims 1-6, characterized in that the obtaining a preset partition threshold for at least two levels of thermal management measures comprises:
establishing at least one coolant temperature threshold according to a first emission requirement of cold nitrogen oxides;
At least one intake air temperature threshold is established based on at least one of a conversion efficiency, fuel consumption, or a second emission requirement of nitrogen oxides of the SCR system.
8. The engine aftertreatment system heating control method according to any one of claims 1-6, characterized in that after starting an in-cylinder post-injection fuel operation, the heating control method further comprises:
acquiring the accumulated oil injection quantity of the in-cylinder post-injection fuel oil operation;
Determining the dilution rate of engine oil according to the fuel injection accumulation amount;
And determining whether to trigger an engine oil replacement alarm according to the engine oil dilution rate.
9. An engine aftertreatment system heating control device, the engine aftertreatment system comprising: intake throttle valve, exhaust throttle valve, heating module and SCR system, its characterized in that, heating controlling means includes:
the threshold management module is used for acquiring preset partition thresholds of at least two levels of thermal management measures;
the detection module is used for acquiring the temperature of engine cooling liquid and the air inlet temperature of the SCR system at least one node;
The thermal management matching module is used for determining target thermal management measures according to the temperature of the engine cooling liquid, the inlet air temperature and the preset partition threshold value;
And the thermal management execution module is used for adjusting the working parameters of the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel oil operation according to the target thermal management measure.
10. An engine aftertreatment system, comprising: an intake throttle valve, an exhaust throttle valve, a heating module, an SCR system, and the heating control device of claim 9;
The heating control device is configured to: acquiring a preset partition threshold of at least two stages of thermal management measures; acquiring the temperature of engine cooling liquid and the air inlet temperature of the SCR system at least one node; determining a target thermal management measure according to the engine coolant temperature, the intake air temperature and the preset partition threshold; and adjusting working parameters of the heating module, the air inlet throttle valve, the air outlet throttle valve and the in-cylinder post-injection fuel operation according to the target thermal management measure.
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| CN202410317844.2A CN118049323A (en) | 2024-03-20 | 2024-03-20 | Engine aftertreatment system and heating control method and device thereof |
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| CN202410317844.2A CN118049323A (en) | 2024-03-20 | 2024-03-20 | Engine aftertreatment system and heating control method and device thereof |
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