CN107060954B - Injection system for purifying exhaust carbon smoke particles and control method - Google Patents

Injection system for purifying exhaust carbon smoke particles and control method Download PDF

Info

Publication number
CN107060954B
CN107060954B CN201710172592.9A CN201710172592A CN107060954B CN 107060954 B CN107060954 B CN 107060954B CN 201710172592 A CN201710172592 A CN 201710172592A CN 107060954 B CN107060954 B CN 107060954B
Authority
CN
China
Prior art keywords
valve
controller
shell
pressure
spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201710172592.9A
Other languages
Chinese (zh)
Other versions
CN107060954A (en
Inventor
尹燕升
陈绍炎
戈非
邢喜春
朱宏志
李冠霖
贾昭远
马立
张亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FAW Group Corp
Original Assignee
FAW Group Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FAW Group Corp filed Critical FAW Group Corp
Priority to CN201710172592.9A priority Critical patent/CN107060954B/en
Publication of CN107060954A publication Critical patent/CN107060954A/en
Application granted granted Critical
Publication of CN107060954B publication Critical patent/CN107060954B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/148—Arrangement of sensors
    • 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)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention belongs to the technical field of automobiles, and particularly relates to an injection system for purifying exhaust carbon smoke particles and a control method. The injection system includes a controller and an injector; the controller is connected with the ECU; the ejector is connected with the exhaust pipe; the controller comprises an on-off electromagnetic valve, a metering valve, a first pressure sensor, a second pressure sensor, a controller upper shell and a controller shell; the switching electromagnetic valve, the metering valve and the first pressure sensor are arranged on the controller shell; the upper controller shell is fastened on the controller shell; the second pressure sensor is arranged on the upper shell of the controller; the controller is connected with the injector through a fuel pipeline. The invention can realize the stability of the pressure of the injected fuel through the controller; the precise control of the injected fuel can be realized through a metering valve; the injection system and the control method for purifying the exhaust soot particles have the advantages that the coking risk of the nozzle can be avoided through the structural design of the nozzle of the injection system, the structure is simple, and the manufacturing cost is low.

Description

Injection system for purifying exhaust carbon smoke particles and control method
Technical Field
The invention belongs to the technical field of automobiles, and relates to a diesel engine for executing national VI and later emission regulations, in particular to an injection system for purifying exhaust soot particles and a control method.
Background
With the increasing strictness of automobile diesel and national emission regulations, the problem of diesel emission is urgently solved. Diesel particulate trap (DPF) technology is currently widely adopted worldwide to address diesel soot emissions. It can trap particulate emissions before they enter the atmosphere, effectively reducing diesel particulate emissions. However, as the driving range increases, more and more particulates are deposited in the trap, which causes an increase in exhaust back pressure and deterioration in economy and dynamics of the engine, and thus, it is necessary to timely oxidize and burn the trapped combustible particulates to realize active regeneration of the DPF. During active regeneration of a DPF, diesel fuel is supplied into an exhaust pipe of an engine using an injection system that purifies exhaust soot particles, and the temperature of the exhaust system is increased after catalytic oxidation by an oxidation catalyst (DOC). High temperature fuel enters the DPF to oxidatively combust soot particles deposited in the DPF.
DE102011075591A1 describes a device for injecting fuel into an exhaust gas treatment device of an internal combustion engine. The device contains structures such as fuel oil passageway, cooling water passageway and compressed gas passageway, adopts compressed gas to carry out the auxiliary injection, can effectively reduce nozzle coking risk. However, the patent does not describe how to achieve the accuracy of fuel injection of the system, and the system is complicated and expensive to manufacture.
CN101454546B describes a device for regeneration, temperature loading and/or thermal management, and an associated injection valve and method. The patent contains two valve head and valve seat configurations and two injection unit configurations, and describes a corresponding method for regenerating, temperature loading, and/or thermal management of components of an exhaust aftertreatment system for an internal combustion engine. However, the patent does not describe how to achieve good atomization and prevent coking. And the system has complex structure and higher processing cost.
Disclosure of Invention
The invention provides a fuel injection device which can realize the stability of the pressure of injected fuel through a controller; the precise control of the injected fuel can be realized through a metering valve; the spray system and the control method for purifying the exhaust carbon smoke particles can avoid the coking risk of the spray nozzle through the structural design of the spray nozzle of the spray system, have simple structure and low manufacturing cost, and solve the defects of the existing spray device.
The technical scheme of the invention is described as follows by combining the attached drawings:
an injection system for purifying exhaust gas carbon particles, the injection system comprising a controller 1 and an injector 7; the controller 1 is connected with the ECU 14; the ejector 7 is connected with an exhaust pipe 17; the controller 1 comprises an on-off electromagnetic valve 2, a metering valve 3, a first pressure sensor 4, a second pressure sensor 11, a controller upper shell 5 and a controller shell 6; the switching electromagnetic valve 2, the metering valve 3 and the first pressure sensor 4 are arranged on the controller shell 6; the controller upper shell 5 is fastened on a controller shell 6 through screws and is connected with the on-off electromagnetic valve 2 and the metering valve 3; the second pressure sensor 11 is arranged on the upper shell 5 of the controller; the ejector 7 comprises a nozzle 8 and a high-temperature heat-insulating pad 9; the nozzle 8 is fixed on the exhaust pipe 17; the high-temperature heat-insulating pad 9 is arranged between the nozzle 8 and the exhaust pipe 17; the control unit 1 is connected to the injectors 7 via a fuel line 10.
The on-off solenoid valve 2 comprises a first solenoid 201, a first needle valve assembly 202, an outlet 203, a first valve seat 204, an inlet 205 and a first spring 206; the lower end of the switch electromagnetic valve 2 is connected with a controller shell 6, and the upper end of the switch electromagnetic valve is connected with a controller upper shell 5; the liquid outlet 203 is arranged at the lower end of the first valve seat 204, and the liquid inlet 205 is arranged at the upper end of the first valve seat 204; the lower end of the first needle valve assembly 202 is in contact with a first valve seat 204, and the upper end of the first needle valve assembly 202 is in contact with the bottom end of a first spring 206; the first needle valve assembly 202 seals against the first valve seat 204 under compression by the first spring 206; the first solenoid coil 201 is sleeved outside the first needle valve assembly 202.
The metering valve 3 comprises a second electromagnetic coil 301, a second needle valve assembly 302, a second valve seat 303, a metering hole 304 and a second spring 305; the lower end of the metering valve 3 is connected with the controller shell 6, and the upper end of the metering valve is connected with the controller upper shell 5; the metering orifice 304 opens into the second valve seat 303; the upper end of the second needle valve assembly 302 is in contact with the second valve seat 303, and the lower end of the second needle valve assembly 302 is in contact with the second spring 305; the second needle valve assembly 302 is sealed with the second valve seat 303 under the compression force of the second spring 305; the second electromagnetic coil 301 is sleeved outside the second needle valve assembly 302.
A quick-plug connector 501 and a liquid outlet connector 502 are arranged on the upper controller shell 5; the controller housing 6 is provided with a pressure chamber 601 inside.
The nozzle 8 comprises a housing 801, a ball valve 802, a third spring 803, a spacer 804, a swirler 805, a third valve seat 806 and an adapter 807; the ball valve 802, the third spring 803, the adjusting shim 804, the swirler 805 and the third valve seat 806 are arranged in a shell 801, and the shell 801 and the adapter 807 are welded into a whole; the ball valve 802 is combined with the conical surface of the inner wall of the shell 801 to form a sealing conical surface; the upper end of the third spring 803 is in contact with the ball valve 802, and the lower end of the third spring 803 is in contact with the adjusting gasket 804; the adjusting shim 804 is arranged between the third spring 803 and the swirler 805; the lower end of the swirler 805 contacts the third valve seat 806; the third valve seat 806 is provided with injection holes.
The swirler 805 comprises an oil inlet groove 805.1 and a swirl groove 805.2; the oil inlet groove 805.1 is formed in the axial side face of the swirler 805 and forms a fuel passage with the third valve seat 806; the vortex groove 805.2 is formed in the bottom end face of the vortex device 805.
A control method of an injection system for purifying exhaust gas carbon particles, the control method comprising the steps of:
step one, the engine provides diesel oil with pressure more than 5bar and enters the liquid inlet 205 through the quick connector 501, the ECU14 controls the opening or closing of the switch electromagnetic valve 2 according to the pressure in the pressure cavity 601 fed back by the first pressure sensor 4, and the pressure in the pressure cavity 601 is stabilized at 5bar +/-0.1 bar;
step two, the ECU14 controls the metering valve 3 to be opened for a corresponding duration at the frequency of 1Hz according to the temperature discharge requirement of the diesel particulate filter 20 to realize the quantitative injection of the diesel;
step three, the ECU14 monitors the pressure value of the second pressure sensor 11 at any time, after the metering valve 3 is opened, the output pressure of the second pressure sensor 11 is quickly increased to 5bar, if the output pressure is not increased, the metering valve 3 is blocked and is not opened, and the ECU14 reports corresponding faults; after the metering valve 3 is closed, the output pressure of the second pressure sensor 11 is rapidly reduced from 5bar, if the output pressure is not reduced, the injector 7 is stuck and does not inject, and the ECU14 reports corresponding faults.
The beneficial effects of the invention are as follows: the invention has simple structure and low manufacturing cost, realizes high injection precision and stability during fuel injection, can diagnose and process faults in time, and can improve the spray quality of the nozzle and prevent coking.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a cross-sectional view of a controller according to the present invention;
FIG. 3 is a cross-sectional view of the injector of the present invention;
FIG. 4 is a perspective view of a swirler of the present invention;
FIG. 5 is a schematic diagram of a control method of the present invention.
In the figure: 1. a controller; 2. switching on and off the electromagnetic valve; 201. a first electromagnetic coil; 202. a first needle valve assembly; 203. a liquid outlet; 204. a first valve seat; 205. a liquid inlet; 206. a first spring; 3. a metering valve; 301. a second electromagnetic coil; 302. a second needle valve assembly; 303. a second valve seat; 304. a metering orifice; 305. a second spring; 4. a first pressure sensor; 5. a controller upper housing; 501. a quick connector; 502. a liquid outlet fitting; 6. a controller housing; 601. a pressure chamber; 7. an ejector; 8. a nozzle; 801. a housing; 802. a ball valve; 803. a third spring; 804. adjusting the gasket; 805. a swirler; 805.1, an oil inlet tank; 805.2, a vortex groove; 806. a third valve seat; 807. an adapter; 9. a high temperature insulating mat; 10. a fuel line; 11. a second pressure sensor; 12. a first temperature sensor; 13. a second temperature sensor; 14. an ECU; 15. a front end pressure sensor; 16. a rear end pressure sensor; 17. an exhaust pipe; 18. a fuel film; 19. a DOC; 20. a DPF.
Detailed Description
Referring to fig. 1 to 4, an injection system for purifying exhaust carbon particles includes a controller 1 and an injector 7; the controller 1 is connected with the ECU 14; the ejector 7 is connected with an exhaust pipe 17; the controller 1 comprises an on-off electromagnetic valve 2, a metering valve 3, a first pressure sensor 4, a second pressure sensor 11, a controller upper shell 5 and a controller shell 6; the switching electromagnetic valve 2, the metering valve 3 and the first pressure sensor 4 are arranged on the controller shell 6; the controller upper shell 5 is fastened on a controller shell 6 through screws and is connected with the on-off electromagnetic valve 2 and the metering valve 3; the second pressure sensor 11 is arranged on the upper shell 5 of the controller; the ejector 7 comprises a nozzle 8 and a high-temperature heat-insulating pad 9; the nozzle 8 is fixed on the exhaust pipe 17; the high-temperature heat-insulating pad 9 is arranged between the nozzle 8 and the exhaust pipe 17; the control unit 1 is connected to the injectors 7 via a fuel line 10.
The controller 1 is used for establishing fuel oil with stable pressure and delivering the fuel oil with stable pressure to the injector 7 according to the exhaust aftertreatment requirement; the switch electromagnetic valve 2 controls the on-off of the pressurized fuel oil generated by the external fuel delivery pump; the first pressure sensor 4 monitors the fuel pressure in the pressure chamber 601 and feeds the fuel pressure back to the ECU 14; the second pressure sensor 11 monitors the pressure in the fuel pipeline 10 and feeds the pressure back to the ECU 14; the metering valve 3 controls the injection quantity of the fuel with stable pressure; the controller upper shell 5 and the controller shell 6 integrate the on-off electromagnetic valve 2, the metering valve 3 and the first pressure sensor 4 and form a fuel passage.
Referring to fig. 1, the first pressure sensor 4 and the second pressure sensor 11 together form a closed-loop control of fuel pressure. When the feedback pressure value of the second pressure sensor 11 is different from the feedback pressure value of the first pressure sensor 4, the ECU14 corrects the injection pulse width of the metering valve 3 according to the feedback values. In addition, when the metering valve 3 is in failure, fuel leakage causes pressure rise in the fuel pipeline 10, the second pressure sensor 11 detects pressure abnormality and feeds back the pressure abnormality to the ECU14, and the ECU14 makes corresponding treatment measures according to actual conditions, such as closing the on-off electromagnetic valve 2, alarming an indicator lamp and the like;
the injector 7 is used for injecting the fuel delivered by the metering valve 3 into an exhaust pipeline in a fine atomized state. Wherein the nozzle 8 is fixed on the exhaust pipe 17 to spray fuel to form fine spray; the high-temperature heat-insulating pad 9 is used for insulating a heat source in the exhaust pipe so as to prevent fuel oil from coking.
Referring to fig. 2, the on-off solenoid valve 2 includes a first solenoid 201, a first needle valve assembly 202, an outlet 203, a first valve seat 204, an inlet 205, and a first spring 206; the lower end of the switch electromagnetic valve 2 is connected with a controller shell 6, and the upper end of the switch electromagnetic valve is connected with a controller upper shell 5; the liquid outlet 203 is arranged at the lower end of the first valve seat 204, and the liquid inlet 205 is arranged at the upper end of the first valve seat 204; the lower end of the first needle valve assembly 202 is in contact with a first valve seat 204, and the upper end of the first needle valve assembly 202 is in contact with the bottom end of a first spring 206; the first needle valve assembly 202 seals against the first valve seat 204 under compression by the first spring 206; the first solenoid coil 201 is sleeved outside the first needle valve assembly 202.
When the first solenoid coil 201 is energized, the electromagnetic force generated by the first solenoid coil 201 causes the first needle valve assembly 202 to move upward against the spring force of the first spring 206 to eventually move the first needle valve assembly 202 from the first valve seat 204 position to the open position. At this time, external pressurized fuel entering from the quick connector 501 enters the switch electromagnetic valve 2 through the liquid inlet 205 and enters the pressure cavity 601 through the liquid outlet 203; when the first solenoid 201 is de-energized, the on-off solenoid valve 2 is closed, and external pressurized fuel cannot enter the pressure chamber 601.
Referring to fig. 2, the metering valve 3 includes a second solenoid 301, a second needle valve assembly 302, a second valve seat 303, a metering hole 304 and a second spring 305; the lower end of the metering valve 3 is connected with the controller shell 6, and the upper end of the metering valve is connected with the controller upper shell 5; the metering orifice 304 opens into the second valve seat 303; the upper end of the second needle valve assembly 302 is in contact with the second valve seat 303, and the lower end of the second needle valve assembly 302 is in contact with the second spring 305; the second needle valve assembly 302 is sealed with the second valve seat 303 under the compression force of the second spring 305; the second electromagnetic coil 301 is sleeved outside the second needle valve assembly 302.
When the second solenoid coil 301 is energized, the electromagnetic force generated by the second solenoid coil 301 causes the second needle valve assembly 302 to move upward against the spring force of the second spring 305 and eventually move the second needle valve assembly 302 from the second valve seat 303 position to the open position. At the moment, the stable-pressure fuel in the pressure chamber 601 is sprayed to the liquid outlet joint 502 through the metering hole 304, wherein the second electromagnetic coil 301 generates electromagnetic force to drive the metering valve 3 to open when being electrified, and the stable-pressure fuel in the pressure chamber 601 enters the nozzle 8; the regulated fuel injection amount is determined by the injection pulse width of the second electromagnetic coil 301.
Referring to fig. 2, the on-off solenoid valve 2 and the metering valve 3 are of the same structure. The difference between the two is that the fuel flow from the outlet port 203 is greater than the flow from the metering orifice 304. When the metering valve is operated, the on-off solenoid valve can be quickly replenished with fuel from the outside to avoid large pressure fluctuations in the pressure chamber 601.
Referring to fig. 2, the controller upper housing 5 is provided with a fast plug 501 and a liquid outlet connector 502; the controller housing 6 is provided with a pressure chamber 601 inside. The controller upper case 5 and the controller case 6 function to integrate the on-off solenoid valve 2, the metering valve 3, the first pressure sensor 4, and the second pressure sensor 11 into the controller 1 and provide a fuel communication passage. The first pressure sensor 4 is used for monitoring the pressure of the pressurized fuel in the pressure chamber 601 and feeding the pressure back to the ECU14, the ECU14 controls the opening or closing of the on-off electromagnetic valve 2 through the feedback pressure value of the fuel pressure sensor 4, and finally, the closed-loop stable control of the pressure in the pressure chamber 601 is realized.
Wherein the second pressure sensor 11 is in communication with the fuel line 10 and monitors the pressure in the fuel line 10 and feeds back the pressure to the ECU 14; when the metering valve 3 is opened, the output pressure of the second pressure sensor 11 is rapidly increased and is equal to the pressure in the pressure chamber 601; when the metering valve 3 is closed, the output pressure of the second pressure sensor 11 rapidly drops and waits for the opening pressure of the injector 7; the ECU14 monitors the pressure value of the second pressure sensor 11 at any time, when the pressure value of the second pressure sensor 11 exceeds the range of the starting pressure of the injector 7 and the pressure in the pressure cavity 601, the system is in failure, and the ECU14 reports a failure code to remind a user of maintenance.
Referring to fig. 3, the nozzle 8 includes a housing 801, a ball valve 802, a third spring 803, a spacer 804, a swirler 805, a third valve seat 806, and an adapter 807; the ball valve 802, the third spring 803, the adjusting shim 804, the swirler 805 and the third valve seat 806 are arranged in a shell 801, and the shell 801 and the adapter 807 are welded into a whole; the ball valve 802 is combined with the inner wall conical surface of the shell 801 to form a sealing conical surface; the upper end of the third spring 803 is in contact with the ball valve 802, and the lower end of the third spring 803 is in contact with the adjusting gasket 804; the adjusting shim 804 is arranged between the third spring 803 and the swirler 805; the lower end of the swirler 805 contacts the third valve seat 806; the third valve seat 806 is provided with injection holes.
The injector 7 is used to form fuel into a swirl-like fine spray. After fuel injected by the metering valve 3 enters the nozzle 8 through the fuel pipeline 10, the fuel pressure overcomes the spring force of the third spring 803 to enable the ball valve 802 to be separated from the conical surface of the inner wall of the shell 801, and the fuel enters the inside of the nozzle 8 and forms rotating fluid through the swirler 805; the fluid is injected into the exhaust pipe 17 in a finely atomized state through the injection holes on the third valve seat 806.
The shell 801 is used for encapsulating the rest of components and welding the rest of components and the adapter 807 into a whole; the ball valve 802 is combined with the conical surface of the inner wall of the shell 801 to form a sealing conical surface; the adjusting shim 804 is used for fixing the third spring 803; the swirler 805 is used to form a swirling fine spray of fuel. After fuel injected by the metering valve 3 enters the nozzle 8 through the fuel pipeline 10, the fuel pressure overcomes the spring force of the third spring 803 to enable the ball valve 802 to be separated from the conical surface of the inner wall of the shell 801, and the fuel enters the inside of the nozzle 8 and forms rotating fluid through the swirler 805; the fluid is injected into the exhaust pipe 17 in a finely atomized state through the injection holes on the third valve seat 806.
Referring to fig. 4, the swirler 805 includes an oil inlet groove 805.1 and a swirl groove 805.2; the oil inlet groove 805.1 is formed in the axial side face of the swirler 805 and forms a fuel passage with the third valve seat 806; the vortex groove 805.2 is formed in the bottom end face of the vortex device 805.
The oil inlet groove 805.1 is matched with the valve seat to form a fuel oil channel, and fuel oil entering the nozzle 8 can only enter the vortex groove 805.2 from the oil inlet groove 805.1. After fuel enters the vortex groove 805.2 from the fuel inlet groove 805.1, the fuel flows out of the vortex groove 805.2 and rotates due to the rotational flow structure of the vortex groove 805.2. Finally, the spray is sprayed out through the spray holes on the third valve seat 80 to form a hollow conical fine spray.
The above-mentioned nozzle 8 is used to inject the fuel delivered by the metering valve 3 into the exhaust line in a finely atomized state.
The high-temperature heat insulation pad 9 is arranged between the nozzle 8 and the exhaust pipe 17 and used for isolating high-temperature transmission in the exhaust pipe 17, so that the temperature of the nozzle 8 is far lower than that of the exhaust pipe 17, and coking caused by high-temperature fission of fuel oil reserved in the nozzle 8 is prevented.
The first temperature sensor 12 is installed at an inlet of the DOC19, i.e., the diesel oxidation converter, for measuring the exhaust temperature at the inlet of the DOC19, and the second temperature sensor 13 is installed at an outlet of the DOC19 for measuring the exhaust temperature at the outlet of the DOC 19. The ECU14 controls the controller 1 based on feedback information from various sensors, and controls the exhaust temperature before the DPF20 by adjusting the amount of fuel injected from the injection nozzle 8 to remove soot. The ECU14 can calculate the soot loading of the DPF20 based on the differential pressure information fed back by the DPF20, i.e., the diesel particulate trap front end pressure sensor 15 and the rear end pressure sensor 16. The ECU14 calculates a base fuel injection quantity model from the soot particle loading.
During regeneration of the DPF20, the nozzle 8 injects fuel into the exhaust pipe 17. Most of the fuel is mixed with the exhaust gas and catalytically oxidized in the DOC19, i.e. the diesel oxidation converter. The catalytic oxidation of the fuel increases the temperature of the exhaust gas input to the DPF20, i.e., the diesel particulate trap, to remove soot particles from the DPF 20. Some of the fuel injected into the exhaust pipe 17 by the nozzle 8 is not mixed with the exhaust gas and is deposited on the inner wall of the exhaust pipe 17 to form a fuel film 18. When the fuel film 18 evaporates in the exhaust pipe 17 to release fuel into the exhaust gas, excessive fuel causes the temperature of the exhaust gas supplied to the DPF20 to rise abnormally and exceed its withstand temperature to damage the DPF20, so the ECU14 forms an injection correction model according to the accumulation rate of the fuel film 18 and the evaporation rate of the fuel, and corrects the diesel injection demand according to this model.
Referring to fig. 5, a control method of an injection system for purifying exhaust carbon particles, the control method comprising the steps of:
step one, the engine provides diesel oil with pressure more than 5bar and enters the liquid inlet 205 through the quick connector 501, the ECU14 controls the opening or closing of the switch electromagnetic valve 2 according to the pressure in the pressure cavity 601 fed back by the first pressure sensor 4, and the pressure in the pressure cavity 601 is stabilized at 5bar +/-0.1 bar;
step two, the ECU14 controls the metering valve 3 to be opened for a corresponding duration at the frequency of 1Hz according to the exhaust temperature requirement of the diesel particulate filter 20 to realize the diesel quantitative injection;
step three, the ECU14 monitors the pressure value of the second pressure sensor 11 at any time, after the metering valve 3 is opened, the output pressure of the second pressure sensor 11 is quickly increased to 5bar, if the output pressure is not increased, the metering valve 3 is blocked and is not opened, and the ECU14 reports corresponding faults; after the metering valve 3 is closed, the output pressure of the second pressure sensor 11 is rapidly reduced from 5bar, if the output pressure is not reduced, the injector 7 is stuck and does not inject, and the ECU14 reports corresponding faults.

Claims (2)

1. An injection system for cleaning exhaust gas carbon particles, characterized in that the injection system comprises a controller (1) and an injector (7); the controller (1) is connected with the ECU (14); the ejector (7) is connected with an exhaust pipe (17); the controller (1) comprises an on-off electromagnetic valve (2), a metering valve (3), a first pressure sensor (4), a second pressure sensor (11), a controller upper shell (5) and a controller shell (6); the switching electromagnetic valve (2), the metering valve (3) and the first pressure sensor (4) are arranged on the controller shell (6); the controller upper shell (5) is fastened on the controller shell (6) through screws and is connected with the switch electromagnetic valve (2) and the metering valve (3); the second pressure sensor (11) is arranged on the upper shell (5) of the controller; the ejector (7) comprises a nozzle (8) and a high-temperature heat-insulating pad (9); the nozzle (8) is fixed on the exhaust pipe (17); the high-temperature heat-insulating pad (9) is arranged between the nozzle (8) and the exhaust pipe (17); the controller (1) is connected with the ejector (7) through a fuel pipeline (10);
the on-off electromagnetic valve (2) comprises a first electromagnetic coil (201), a first needle valve assembly (202), a liquid outlet (203), a first valve seat (204), a liquid inlet (205) and a first spring (206); the lower end of the switch electromagnetic valve (2) is connected with the controller shell (6), and the upper end of the switch electromagnetic valve is connected with the controller upper shell (5); the liquid outlet (203) is arranged at the lower end of the first valve seat (204), and the liquid inlet (205) is arranged at the upper end of the first valve seat (204); the lower end of the first needle valve assembly (202) is in contact with a first valve seat (204), and the upper end of the first needle valve assembly (202) is in contact with the bottom end of a first spring (206); said first needle valve assembly (202) sealing against a first valve seat (204) under compression by a first spring (206); the first electromagnetic coil (201) is sleeved outside the first needle valve assembly (202);
the metering valve (3) comprises a second electromagnetic coil (301), a second needle valve assembly (302), a second valve seat (303), a metering hole (304) and a second spring (305); the lower end of the metering valve (3) is connected with the controller shell (6), and the upper end of the metering valve is connected with the controller upper shell (5); the metering hole (304) is opened on the second valve seat (303); the upper end of the second needle valve assembly (302) is in contact with a second valve seat (303), and the lower end of the second needle valve assembly (302) is in contact with a second spring (305); the second needle valve assembly (302) is sealed with the second valve seat (303) under the compression force of a second spring (305); the second electromagnetic coil (301) is sleeved outside the second needle valve assembly (302);
a quick-plug connector (501) and a liquid outlet connector (502) are arranged on the upper controller shell (5); a pressure cavity (601) is arranged in the controller shell (6);
the nozzle (8) comprises a shell (801), a ball valve (802), a third spring (803), a regulating gasket (804), a swirler (805), a third valve seat (806) and an adapter (807); the ball valve (802), the third spring (803), the adjusting shim (804), the swirler (805) and the third valve seat (806) are arranged in a shell (801), and the shell (801) and the adapter (807) are welded into a whole; the ball valve (802) is combined with the conical surface of the inner wall of the shell (801) to form a sealing conical surface; the upper end of the third spring (803) is contacted with the ball valve (802), and the lower end of the third spring (803) is contacted with the adjusting gasket (804); the adjusting gasket (804) is arranged between the third spring (803) and the swirler (805); the lower end of the swirler (805) is in contact with a third valve seat (806); the third valve seat (806) is provided with an injection hole;
the swirler (805) comprises an oil inlet groove (805.1) and a swirl groove (805.2); the oil inlet groove (805.1) is formed in the axial side face of the swirler (805) and forms a fuel passage with the third valve seat (806); the vortex groove (805.2) is arranged on the bottom end face of the vortex device (805).
2. A control method of an injection system for cleaning exhaust gas carbon particles according to claim 1, characterized by comprising the steps of:
step one, the engine provides diesel oil of more than 5bar and enters the liquid inlet (205) through the quick connector (501), the ECU (14) controls the opening or closing of the switch electromagnetic valve (2) according to the pressure in the pressure cavity (601) fed back by the first pressure sensor (4), and the pressure in the pressure cavity (601) is stabilized at 5bar +/-0.1 bar;
step two, the ECU (14) controls the metering valve (3) to be opened for a corresponding duration at the frequency of 1Hz according to the temperature exhaust requirement of the diesel engine particle trap (20) during operation, so as to realize the quantitative injection of diesel oil;
step three, the ECU (14) monitors the pressure value of the second pressure sensor (11) at any time, after the metering valve (3) is opened, the output pressure of the second pressure sensor (11) is rapidly increased to 5bar, if the output pressure is not increased, the metering valve (3) is blocked and is not opened, and the ECU (14) reports corresponding faults; when the metering valve (3) is closed, the output pressure of the second pressure sensor (11) is rapidly reduced from 5bar, if the output pressure is not reduced, the injector (7) is stuck and does not inject, and the ECU (14) reports corresponding faults.
CN201710172592.9A 2017-03-22 2017-03-22 Injection system for purifying exhaust carbon smoke particles and control method Active CN107060954B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710172592.9A CN107060954B (en) 2017-03-22 2017-03-22 Injection system for purifying exhaust carbon smoke particles and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710172592.9A CN107060954B (en) 2017-03-22 2017-03-22 Injection system for purifying exhaust carbon smoke particles and control method

Publications (2)

Publication Number Publication Date
CN107060954A CN107060954A (en) 2017-08-18
CN107060954B true CN107060954B (en) 2023-04-07

Family

ID=59620944

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710172592.9A Active CN107060954B (en) 2017-03-22 2017-03-22 Injection system for purifying exhaust carbon smoke particles and control method

Country Status (1)

Country Link
CN (1) CN107060954B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110593990B (en) * 2019-09-25 2021-01-15 潍柴动力股份有限公司 Fuel pipeline leakage detection method of HC injection system and related device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007315313A (en) * 2006-05-26 2007-12-06 Bosch Corp Exhaust emission control device of internal combustion engine

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3103395A1 (en) * 1981-02-02 1982-04-01 De Limon Fluhme GmbH & Co, 4000 Düsseldorf Spray nozzle
DE102005034704A1 (en) * 2005-07-26 2007-02-01 Robert Bosch Gmbh Apparatus and method for regeneration of a particulate filter
US8171721B2 (en) * 2007-01-22 2012-05-08 International Engine Intellectual Property Company, Llc Closed loop control of exhaust system fluid dosing
KR100907376B1 (en) * 2007-12-04 2009-07-10 현대자동차주식회사 Swirl Spray Nozzle System for Injector
JP2009185735A (en) * 2008-02-07 2009-08-20 Toyota Motor Corp Exhaust emission control apparatus
DE102008040463A1 (en) * 2008-07-16 2010-01-21 Robert Bosch Gmbh Device for metering in fuel
DE102008055056A1 (en) * 2008-12-22 2010-07-01 Robert Bosch Gmbh Device for metering in fuel
US9488086B2 (en) * 2013-12-23 2016-11-08 Baohua Qi Low pressure atomizing injector
CN105986863A (en) * 2015-02-15 2016-10-05 浙江福爱电子有限公司 Swirl nozzle for exhaust aftertreatment
CN206681820U (en) * 2017-03-22 2017-11-28 中国第一汽车股份有限公司 For purifying the spraying system of exhaust carbon fume particle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007315313A (en) * 2006-05-26 2007-12-06 Bosch Corp Exhaust emission control device of internal combustion engine

Also Published As

Publication number Publication date
CN107060954A (en) 2017-08-18

Similar Documents

Publication Publication Date Title
US8006482B2 (en) Method of purging fluid injector by heating
US8484947B2 (en) Fluid injector having purge heater
WO2018214861A1 (en) Burner dpf regeneration control and diagnostic device
US9003772B2 (en) Method and control unit for metering fuel into an exhaust gas duct
CN101652540B (en) Exhaust purification system for internal combustion engine
CN110067618B (en) DPF regeneration device with two-phase flow medium mixed and exhaust temperature rising strategy thereof
CN105587379B (en) A kind of dpf regeneration device and method
US20070228191A1 (en) Cooled nozzle assembly for urea/water injection
JP2015526636A (en) Air-driven reducing agent transport system
CN105822394B (en) A kind of gas-liquid mixed engine exhaust post-processing injection apparatus
US20080302089A1 (en) Dispensing System with Remotely Mounted Metering Device
JP4662887B2 (en) Exhaust gas purification device for internal combustion engine
CN107060954B (en) Injection system for purifying exhaust carbon smoke particles and control method
US9371824B2 (en) Dosing device
CN113931721A (en) Engine exhaust hydrocarbon injection system and control strategy thereof
WO2024041199A1 (en) Hydrocarbon ejection system and control method therefor, and vehicle exhaust post-treatment system
WO2016041339A1 (en) Liquid jet metering unit and control method
CN105822393B (en) A kind of gas assisted atomization liquid meter injection apparatus
US20130152556A1 (en) Fluid injector having heater
CN206681820U (en) For purifying the spraying system of exhaust carbon fume particle
US20140054396A1 (en) Fluid injector
CN106948906A (en) A kind of hydrocarbon spraying system from supercharging
CN211174291U (en) Fuel oil metering and injecting device and system for diesel vehicle tail gas aftertreatment system
CN105986866B (en) A kind of digital fluid metering device and control method
CN106593604B (en) HC injection device for diesel vehicle

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant