CN118030241A - Integrated post-treatment hydrocarbon injection system of VP pump system of diesel engine and control method thereof - Google Patents
Integrated post-treatment hydrocarbon injection system of VP pump system of diesel engine and control method thereof Download PDFInfo
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- CN118030241A CN118030241A CN202311676649.0A CN202311676649A CN118030241A CN 118030241 A CN118030241 A CN 118030241A CN 202311676649 A CN202311676649 A CN 202311676649A CN 118030241 A CN118030241 A CN 118030241A
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- 238000002347 injection Methods 0.000 title claims abstract description 124
- 239000007924 injection Substances 0.000 title claims abstract description 124
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 82
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 81
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 58
- 230000008929 regeneration Effects 0.000 claims abstract description 97
- 238000011069 regeneration method Methods 0.000 claims abstract description 97
- 239000004071 soot Substances 0.000 claims description 21
- 239000000446 fuel Substances 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 15
- 238000007254 oxidation reaction Methods 0.000 claims description 11
- 230000003647 oxidation Effects 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 claims description 5
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 55
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- JCXJVPUVTGWSNB-UHFFFAOYSA-N Nitrogen dioxide Chemical compound O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 5
- 238000013499 data model Methods 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- -1 hydrocarbon HC Chemical class 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241001124569 Lycaenidae Species 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
- F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
- F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1602—Temperature of exhaust gas apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1606—Particle filter loading or soot amount
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention relates to the technical field of environmental protection emission upgrading of diesel engines, in particular to a hydrocarbon injection system for integrated post-treatment of a VP pump system of a diesel engine and a control method thereof, wherein the system comprises a hydrocarbon HC injection device, a VP pump oil supply unit and an engine electronic control unit ECU; the HC injection device comprises a metering module and an injection module; the engine ECU is used for collecting and controlling the working states of the HC injection device and the VP pump oil control unit. The engine ECU is used for synchronously collecting and controlling the working states of the HC injection device and the VP pump oil control unit, and realizing the improvement of the working power section of the diesel engine under the condition of forming a novel integrated system and meeting the requirements of the active regeneration function of the DPF and effectively controlling the emission of exhaust pollutants.
Description
Technical Field
The invention relates to the technical field of environmental protection emission upgrading of diesel engines, in particular to a diesel engine VP pump system integrated post-treatment Hydrocarbon (HC) injection system and a control method thereof.
Background
The VP pump fuel system of the diesel engine is widely applied and favored in the non-markets due to the superior performance of products. At present, the full-electric control VP pump system comprehensively replaces an electric control VE pump, and is widely applied to the non-road small horsepower machinery market.
At present, the fully-electrically-controlled VP pump system is carried with a diesel engine and has been applied to light trucks in a large scale, and the product quality is stable and reliable.
However, due to the limitation of the inherent structural design of the electronic control VP pump system, only a single fuel injection (in-cylinder post injection cannot be realized), and the active regeneration of the post-treatment of the diesel particle catcher (Diesel Particulate Filter, DPF) cannot be realized through multiple injections of the fuel system, so that the working power section of the diesel engine is limited. In one example, the operating power section of the diesel engine is below 37 kw.
Disclosure of Invention
The invention aims to overcome the defects and the shortcomings of the prior art, and provides a hydrocarbon injection system for integrated post-treatment of a diesel engine VP pump system and a control method thereof. The technical scheme is as follows:
In one aspect, a diesel engine VP pump system integrated aftertreatment hydrocarbon injection system is provided, the system comprising a hydrocarbon HC injection device, a VP pump oil supply unit, and an engine electronic control unit (Electronic Control Unit, ECU);
the HC injection device comprises a metering module and an injection module, wherein the metering module is used for metering the working condition of the HC injection device, and the injection module is used for injecting fuel;
the VP pump oil supply unit is connected with the engine ECU through a control line;
the VP pump oil supply unit is connected with the HC injection device through a low-pressure cavity oil return pipe;
The engine ECU is used for collecting and controlling the working states of the HC injection device and the VP pump oil control unit.
In an alternative embodiment, the metering module includes an oil inlet pressure sensor and an oil injection metering valve;
The oil inlet pressure sensor is used for detecting the oil inlet pressure;
the fuel injection metering valve is used for detecting fuel injection flow.
In an alternative embodiment, the return oil pressure of the VP pump return unit ranges from 6 bar to 9bar when the engine speed is 1000-2400 rpm.
In an alternative embodiment, the system further comprises a regeneration inhibit switch, a brake switch, and a regeneration start switch;
the regeneration prohibiting switch, the brake switch and the regeneration starting switch are connected with the engine ECU in a communication way.
In another aspect, a control method of a diesel engine VP pump system integrated aftertreatment hydrocarbon injection system is provided, and the method is applied to an engine electronic control unit ECU in the diesel engine VP pump system integrated aftertreatment hydrocarbon injection system, where the method is characterized by comprising:
Acquiring engine working condition data, wherein the engine working condition data comprises DPF pressure difference of a particle catcher, engine running time, DOC front temperature of a diesel oxidation catalyst, DPF front temperature and engine rotating speed;
determining a soot particulate loading condition based on a DPF differential pressure and an engine run time;
generating a regeneration request in response to the soot loading state indicating soot loading;
and in response to the regeneration request, controlling the integrated post-treatment hydrocarbon injection system of the VP pump system of the diesel engine to enter an active regeneration process, and determining active regeneration process working conditions in real time based on the DOC front temperature and the DPF front temperature, wherein the active regeneration process working conditions comprise an oil injection metering valve opening, a throttle opening and an exhaust gas recirculation (Exhaust Gas Recirculation, EGR) valve opening.
In an alternative embodiment, controlling the diesel VP pump system integrated aftertreatment hydrocarbon injection system to enter an active regeneration process in response to the presence of a regeneration request includes:
responding to the regeneration request, and calling the regeneration condition of the integrated post-treatment hydrocarbon injection system of the VP pump system of the diesel engine to enter an active regeneration process;
And controlling the integrated post-treatment hydrocarbon injection system of the diesel VP pump system to enter an active regeneration process in response to the condition that the integrated post-treatment hydrocarbon injection system of the diesel VP pump system meets the regeneration condition.
In an alternative embodiment, the regeneration conditions include a regeneration inhibit switch state condition, a brake switch state condition, an oil pressure condition, and an engine speed condition.
In an alternative embodiment, after determining the active regeneration process operating condition based on the DOC front temperature and the DPF front temperature in response to the presence of the regeneration request, the method includes:
Determining DPF pressure difference and engine rotating speed in real time in response to the integration of a VP pump system of the diesel engine and the after-treatment hydrocarbon injection system being in an active regeneration process;
and controlling the integrated post-treatment hydrocarbon injection system of the VP pump system of the diesel engine to exit the active regeneration process in response to the DPF pressure difference and the engine rotation speed to indicate that the DPF is in an idle state.
The invention at least has the following beneficial effects:
In the structure that the traditional VP pump oil supply unit is connected with an engine ECU, an HC injection device is added, and the technical route of tail pipe injection of the HC injection device is combined, so that the engine ECU synchronously collects and controls the working states of the HC injection device and the VP pump oil control unit. After the novel integrated system is formed, the working power section of the diesel engine is lifted (37 kW is less than or equal to Pmax is less than 56 kW), and the requirements of the DPF active regeneration function and the emission of exhaust pollutants can be effectively controlled.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention.
FIG. 1 illustrates a schematic diagram of a diesel VP pump system integrated aftertreatment hydrocarbon injector system in accordance with an exemplary embodiment of the invention.
FIG. 2 illustrates a schematic diagram of another diesel VP pump system integrated aftertreatment hydrocarbon injection system, in accordance with an exemplary embodiment of the invention.
FIG. 3 is a flow chart illustrating a method for controlling an integrated aftertreatment hydrocarbon injection system for a VP pump system of a diesel engine in accordance with an exemplary embodiment of the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
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 in order to describe the embodiments of the invention 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 illustrates a schematic diagram of a diesel VP pump system integrated aftertreatment hydrocarbon injector system in accordance with an exemplary embodiment of the invention. The system comprises a hydrocarbon HC injection device 110, a VP pump oil supply unit 120 and an engine electronic control unit ECU130; the HC injection device 110 comprises a metering module 111 and an injection module 112, wherein the metering module 111 is used for metering the working condition of the HC injection device 110, and the injection module 112 is used for injecting fuel; VP pump oil supply unit 120 is connected to engine ECU130 via a control line; the VP pump oil supply unit 120 is connected with the HC injection device 110 through a low-pressure cavity oil return pipe; engine ECU130 is configured to collect and control the operating states of HC injection device 110 and VP pump control oil unit 120.
It is required that the present invention is not limited to the specific model of the HC injection device, VP pump oil supply unit, and engine ECU, but is limited only to the specific function implementation of the above devices, and the connection relationship among the systems.
In the embodiment of the present invention, the engine ECU is a control device corresponding to the engine. Therefore, the engine ECU can acquire the engine-related conditions.
In the embodiment of the present invention, the engine corresponds to an engine exhaust gas management function, and an oxidation catalyst (Diesel Oxidation Catalyst, DOC) and a particle trap (Diesel Particulate Filter, DPF) are installed in an engine exhaust line. Means for converting carbon monoxide CO, hydrocarbons HC and soluble organic components (Soluble Organic Fraction, SOF) in the engine exhaust into harmless water and carbon dioxide by DOC oxidation; meanwhile, the oxidation reaction of the oil injection in the DOC is carried out to oxidize and convert NO into NO2, the exhaust temperature is increased to be more than 550 ℃, the required heat is provided for DPF regeneration, the carbon combustion oxidation reaction is carried out to generate carbon dioxide, and the aim of reducing soot in the DPF is achieved. The process is the DPF post-treatment active regeneration process.
In the embodiment of the invention, the engine ECU is used for collecting and controlling the working states of the HC injection device and the VP pump oil supply unit, so that a linkage working relationship is generated between the HC injection device and the VP pump oil supply unit, and the adjustment of the system state is realized.
In the embodiment of the invention, the VP pump oil supply unit is connected with the HC injection device through the low-pressure cavity oil return pipe, and under the actual working condition, the fuel oil with the oil return pressure of about 9bar is output and used as a fuel oil injection driving source with the opening pressure of 5bar of the HC injection device.
In the embodiment of the invention, the working states of the HC injection device and the VP pump oil control unit include, but are not limited to, the start-stop states of the HC injection device and the VP pump oil control unit, and the start-stop linkage states of the HC injection device and the VP pump oil control unit.
According to the VP pump oil supply unit provided by the embodiment of the invention, 1 oil return pipe is added at the oil return joint of the low-pressure cavity of the conventional VP pump, namely, the oil return pipe of the low-pressure cavity; the inner diameters of the oil return pipe and the oil pipe of the low-pressure cavity are 4mm.
FIG. 2 illustrates a schematic diagram of another diesel VP pump system integrated aftertreatment hydrocarbon injection system, in accordance with an exemplary embodiment of the invention. Next, a specific structure and function of the integrated post-treatment hydrocarbon injection system of the VP pump system of the diesel engine will be described with reference to fig. 2. In an alternative embodiment, metering module 111 includes an intake pressure sensor 1111 and a fuel injection metering valve 1112; the oil inlet pressure sensor is used for detecting the oil inlet pressure; the fuel injection metering valve is used for detecting fuel injection flow.
Under the condition, when the rotation speed of the engine is 1000-2400 rpm, the oil return pressure range of the VP pump return unit is 6-9bar so as to adapt to the requirements in related application scenes.
Optionally, the injection module is provided with a nozzle, an oil inlet pressure sensor and an oil injection metering valve, i.e. for detecting the operating state of the nozzle.
Referring to FIG. 2, in one embodiment, the system further includes a regeneration inhibit switch 141, a brake switch 142, and a regeneration start switch 143; the regeneration prohibiting switch 141, the brake switch 142, and the regeneration starting switch 143 are communicatively connected to the engine ECU.
The regeneration prohibiting switch, the brake switch, and the regeneration starting switch are switching elements in the system, and the engine ECU can know the state of the driving device corresponding to the engine by the states of the three. In one example, when the driving apparatus is in a parking state, the engine ECU side performs coordinated control of the VP pump oil supply unit and the HC injection device.
In summary, in the system provided by the embodiment of the invention, the HC injection device is added on the structure that the traditional VP pump oil supply unit is connected with the engine ECU, and the engine ECU is used for synchronously collecting and controlling the working states of the HC injection device and the VP pump oil control unit according to the technical route of tail pipe injection of the HC injection device, so that under the condition of forming a novel integrated system, the diesel engine working power section is improved (37 kW is less than or equal to Pmax and less than 56 kW), and the requirements of the DPF active regeneration function can be met, and the exhaust pollutant emission can be effectively controlled.
Fig. 3 is a schematic flow chart of a control method of a VP pump system integrated aftertreatment hydrocarbon injection system of a diesel engine according to an exemplary embodiment of the present invention, which is described by taking the method applied to an engine ECU in a control system of a VP pump system integrated aftertreatment hydrocarbon injection system of a diesel engine as shown in fig. 1 or fig. 2 as an example, the method includes:
In step 301, engine operating condition data is obtained.
Alternatively, the flow of the embodiment of the present invention is implemented as a preset program integrated in the engine ECU, or as a real-time program that is sent to the engine ECU by other computer devices and processed, or as a data model written in the engine ECU.
In combination with the foregoing description, the engine operating condition data and the engine internal embodiments of the present invention include the particle trap DPF differential pressure, the engine operating time, the diesel oxidation catalyst DOC pre-temperature, the DPF pre-temperature, and the engine speed. That is, the engine operating condition data relates to the engine operating state and the engine being a post-process.
Step 302, a soot particulate full state is determined based on a DPF differential pressure and an engine run time.
In the embodiment of the invention, when the soot particles reach a preset full-load state, the corresponding working condition is that the pressure difference between an inlet and an outlet of DPF equipment in the engine reaches a pressure difference threshold value, and the running time of the engine reaches a running time threshold value.
In step 303, a regeneration request is generated in response to the soot loading state indicating that the soot particles are loaded.
In the embodiment of the invention, when the pressure difference between the inlet and the outlet of DPF equipment in the engine reaches a pressure difference threshold value and the running time of the engine reaches a running time threshold value, namely, the condition that the soot particles are fully loaded is determined to indicate that the soot particles are fully loaded, a regeneration request is generated, and the regeneration request indicates the engine to control the HC injection device to be linked with the VP pump oil supply unit so as to enter an active regeneration state of the engine.
And step 304, in response to the regeneration request, controlling the VP pump system integrated post-treatment hydrocarbon injection system of the diesel engine to enter an active regeneration process, and determining the working condition of the active regeneration process in real time based on the DOC front temperature and the DPF front temperature.
In the embodiment of the invention, when a diesel engine VP pump system integrated post-treatment hydrocarbon injection system enters an active regeneration process, an injection module needs to carry out a request for adjusting the injection quantity through an injection metering valve and a request for adjusting the opening degree of a throttle valve, the injection module is adjusted to inject fuel oxidized on a DOC, the air inflow of fresh air is controlled, and an exhaust gas recirculation (Exhaust Gas Recirculation, EGR) valve is closed; the oxidation reaction of the nitrogen monoxide NO in the DOC is carried out through the oil injection to convert the nitrogen monoxide NO into the nitrogen dioxide NO2, the temperature in front of the DPF is increased to be more than 550 ℃, the heat required by DPF regeneration is provided, the carbon combustion oxidation reaction is carried out to generate carbon dioxide, and the aim of reducing the soot in the DPF is achieved. That is, the active regeneration process conditions include fuel injection metering valve opening, throttle opening, and EGR valve opening.
In this case, the engine ECU controls the active regeneration condition by means of closed-loop control.
In the embodiment of the invention, as shown in fig. 2, when a regeneration prohibiting switch, a brake switch and a regeneration starting switch are included in the system, a regeneration condition that a diesel engine VP pump system integrated post-treatment hydrocarbon injection system enters an active regeneration process is called in response to the existence of a regeneration request;
And controlling the integrated post-treatment hydrocarbon injection system of the diesel VP pump system to enter an active regeneration process in response to the condition that the integrated post-treatment hydrocarbon injection system of the diesel VP pump system meets the regeneration condition. At this time, the regeneration conditions include a regeneration prohibition switch state condition, a brake switch state condition, an oil feed pressure condition, and an engine speed condition.
In an alternative embodiment, the active regeneration process will enter an idle state after the soot particles are oxidized to a gaseous state while the active regeneration process continues, in which case the DPF differential pressure and engine speed are determined in real time in response to the diesel VP pump system integrated aftertreatment hydrocarbon injector system being in the active regeneration process; and controlling the integrated post-treatment hydrocarbon injection system of the VP pump system of the diesel engine to exit the active regeneration process in response to the DPF pressure difference and the engine rotation speed to indicate that the DPF is in an idle state.
The embodiment corresponding to the above steps shows that in an alternative embodiment, according to the written data model of the engine ECU, the DPF sends a regeneration request when it is determined that the carbon loading of the DPF reaches the set soot loading state through the system operation time and the input of the DPF differential pressure signal. The engine ECU determines the parking state of driving equipment corresponding to the engine, namely, a user parks the non-road mobile machinery in an open area, the engine keeps an idle state, and the water temperature of the engine reaches a set boundary condition; sequentially turning off a regeneration inhibition switch, turning on a brake switch and restarting the regeneration inhibition switch, wherein the rotating speed of the engine is gradually increased from idling to the parking regeneration rotating speed 2200r/min, and meanwhile, the engine ECU receives the oil inlet pressure output by an oil inlet pressure sensor to reach 8bar, the fluctuation of the oil inlet pressure is within 5%, and the engine ECU judges that the oil path of the metering module meets the driving pressure requirement of the injection module, namely the mechanical nozzle; fuel is conveyed to a mechanical nozzle through a fuel injection metering valve at the metering frequency of 10Hz, then is injected into an exhaust manifold through the mechanical nozzle, the system judges that the system initially enters active regeneration through the input of a temperature signal before DOC according to an engine ECU data model, closed loop control adjusts the fuel injection quantity of the fuel injection metering valve, adjusts the air inflow of fresh air through the opening degree of a throttle valve, closes an EGR valve, injects a medium in an injection module on the DOC for oxidation reaction, increases the temperature before DPF to be higher than 550 ℃ required by active regeneration, and continuously operates for 20-25 min, and oxidizes soot particles attached to the DPF into a gaseous state. And finally, the system judges that the DPF reaches a set soot particle idle state through the input of a differential pressure sensor signal according to a written data model in the engine ECU, and outputs a request for exiting regeneration of the system, namely, the active regeneration process of the parking regeneration mode of the post-processing unit is completed.
In summary, in the method provided by the embodiment of the invention, the HC injection device is added on the structure that the traditional VP pump oil supply unit is connected with the engine ECU, and the technical route of tail pipe injection of the HC injection device is combined, so that the engine ECU synchronously collects and controls the working states of the HC injection device and the VP pump oil control unit, under the condition that a novel integrated system is formed, the diesel engine working power section is improved (37 kW is less than or equal to Pmax and less than 56 kW), and the requirements of DPF active regeneration function can be met, and the exhaust pollutant emission can be effectively controlled.
According to the system and the method provided by the embodiment of the invention, the VP pump oil supply unit is connected with the oil inlet joint in the HC injection device through the low-pressure cavity oil return pipe. And judging the full state of the DPF post-treatment soot particles by using an engine ECU data model, judging that the DPF post-treatment soot particles have regeneration conditions, judging that the mechanical nozzle accords with injection conditions, adjusting the injection quantity of an injection metering valve and the opening degree of a throttle valve to adjust the air inflow of fresh air through closed-loop control, improving the inlet temperature of the DPF, reaching the temperature required by the active regeneration of the DPF post-treatment, oxidizing the soot particles attached to the DPF into gas, and meeting the active regeneration of the DPF post-treatment. Compared with the conventional HC injection system, a separate controller is eliminated in structure.
Compared with the conventional driving regeneration mode, the parking regeneration mode selected by the embodiment of the invention is easy to control and has stronger practicability and realizability. Considering the actual use scene of the non-road mobile machinery, especially the specificity of agricultural machinery (tractors, harvesters and the like), and the non-road machinery mainly operates under the working conditions of high speed and heavy load with high exhaust temperature, DPF active regeneration is not suitable for the conventional driving regeneration mode.
The system and the method related to the embodiment of the invention have simple structure and low processing difficulty; the HC injection device utilizes the engine ECU to precisely control the metering electromagnetic valve, so that the software strategy is easy to control, the calibration development period is short, and the verification and the realization are easy; the mechanical nozzle of the injection module has good atomization performance, simple structure, convenient installation and low processing difficulty.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (8)
1. The integrated aftertreatment hydrocarbon injection system of the VP pump system of the diesel engine is characterized by comprising a hydrocarbon HC injection device, a VP pump oil supply unit and an engine electronic control unit ECU;
The HC injection device comprises a metering module and an injection module, wherein the metering module is used for metering the working condition of the HC injection device, and the injection module is used for injecting fuel;
The VP pump oil supply unit is connected with the engine ECU through a control line;
The VP pump oil supply unit is connected with the HC injection device through a low-pressure cavity oil return pipe;
the engine ECU is used for collecting and controlling the working states of the HC injection device and the VP pump oil control unit.
2. The integrated post-treatment hydrocarbon injection system of the diesel VP pump system of claim 1, wherein the metering module comprises an oil intake pressure sensor and an oil injection metering valve;
The oil inlet pressure sensor is used for detecting oil inlet pressure;
The oil injection metering valve is used for detecting oil injection flow.
3. The integrated post-treatment hydrocarbon injection system of a diesel engine VP pump system according to claim 2, wherein the oil return pressure of the VP pump return unit ranges from 6 bar to 9bar when the engine speed is 1000 to 2400 rpm.
4. The diesel VP pump system integrated aftertreatment hydrocarbon injection system of claim 1, further comprising a regeneration inhibit switch, a brake switch, and a regeneration start switch;
the regeneration prohibiting switch, the brake switch, and the regeneration starting switch are communicatively connected to the engine ECU.
5. A control method of a diesel engine VP pump system integrated aftertreatment hydrocarbon injection system, characterized in that the method is applied to an engine electronic control unit ECU in the diesel engine VP pump system integrated aftertreatment hydrocarbon injection system according to any one of claims 1 to 3, characterized in that the method comprises:
Acquiring engine working condition data, wherein the engine working condition data comprises DPF pressure difference of a particle catcher, engine running time, DOC front temperature of a diesel oxidation catalyst, DPF front temperature and engine rotating speed;
determining a soot particulate loading condition based on the DPF differential pressure and an engine run time;
generating a regeneration request in response to the soot loading state indicating soot loading;
And in response to the regeneration request, controlling the integrated post-treatment hydrocarbon injection system of the VP pump system of the diesel engine to enter an active regeneration process, and determining active regeneration process working conditions in real time based on the temperature before the DOC and the temperature before the DPF, wherein the active regeneration process working conditions comprise an oil injection metering valve opening, a throttle opening and an exhaust gas recirculation (Exhaust Gas Recirculation, EGR) valve opening.
6. The method of claim 5, wherein said controlling the diesel VP pump system integrated aftertreatment hydrocarbon injection system into an active regeneration process in response to the presence of a regeneration request comprises:
Responding to the regeneration request, and calling the regeneration condition of the integrated post-treatment hydrocarbon injection system of the VP pump system of the diesel engine to enter an active regeneration process;
and controlling the integrated post-treatment hydrocarbon injection system of the diesel VP pump system to enter an active regeneration process in response to the condition that the integrated post-treatment hydrocarbon injection system of the diesel VP pump system meets the regeneration condition.
7. The method of claim 6, wherein the regeneration conditions include a regeneration inhibit switch state condition, a brake switch state condition, an oil pressure condition, and an engine speed condition.
8. The method of claim 5, wherein said determining an active regeneration process operating condition based on said pre-DOC temperature and said pre-DPF temperature in response to the presence of a regeneration request comprises:
Determining the DPF pressure difference and the engine speed in real time in response to the diesel VP pump system integrated aftertreatment hydrocarbon injection system being in an active regeneration process;
And controlling the integrated post-treatment hydrocarbon injection system of the VP pump system of the diesel engine to exit the active regeneration process in response to the DPF pressure difference and the engine speed indicating that the DPF is in an idle state.
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| CN202311676649.0A CN118030241A (en) | 2023-12-07 | 2023-12-07 | Integrated post-treatment hydrocarbon injection system of VP pump system of diesel engine and control method thereof |
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| CN202311676649.0A CN118030241A (en) | 2023-12-07 | 2023-12-07 | Integrated post-treatment hydrocarbon injection system of VP pump system of diesel engine and control method thereof |
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| CN (1) | CN118030241A (en) |
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