CN101828011A - Control device and control method for reducing agent supply device - Google Patents
Control device and control method for reducing agent supply device Download PDFInfo
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- CN101828011A CN101828011A CN200880112164A CN200880112164A CN101828011A CN 101828011 A CN101828011 A CN 101828011A CN 200880112164 A CN200880112164 A CN 200880112164A CN 200880112164 A CN200880112164 A CN 200880112164A CN 101828011 A CN101828011 A CN 101828011A
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 227
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 152
- 239000007924 injection Substances 0.000 claims abstract description 152
- 239000000498 cooling water Substances 0.000 claims abstract description 133
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 108
- 239000004202 carbamide Substances 0.000 claims abstract description 108
- 239000007789 gas Substances 0.000 claims abstract description 51
- 230000007246 mechanism Effects 0.000 claims abstract description 38
- 238000002485 combustion reaction Methods 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 239000003054 catalyst Substances 0.000 claims abstract description 26
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 19
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 230000009467 reduction Effects 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims description 32
- 230000001276 controlling effect Effects 0.000 claims description 20
- 238000009835 boiling Methods 0.000 claims description 11
- 238000012423 maintenance Methods 0.000 claims description 11
- 230000008520 organization Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000000446 fuel Substances 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 abstract description 12
- 230000008025 crystallization Effects 0.000 abstract description 12
- 238000001514 detection method Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract 1
- 230000003685 thermal hair damage Effects 0.000 abstract 1
- 239000007864 aqueous solution Substances 0.000 description 70
- 239000007921 spray Substances 0.000 description 18
- 238000005507 spraying Methods 0.000 description 7
- 238000006722 reduction reaction Methods 0.000 description 6
- 238000007710 freezing Methods 0.000 description 5
- 230000008014 freezing Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000004781 supercooling Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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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
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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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
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
- F01N2260/024—Exhaust treating devices having provisions not otherwise provided for for cooling the device using a liquid
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
- F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
-
- 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
- F01N2610/11—Adding substances to exhaust gases the substance or part of the dosing system being cooled
-
- 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
- F01N2610/1433—Pumps
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
-
- 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
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1811—Temperature
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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
- 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
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1812—Flow rate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/16—Outlet manifold
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/20—Cooling circuits not specific to a single part of engine or machine
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Toxicology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Treating Waste Gases (AREA)
Abstract
Provided are a reducing agent supply device and a control method thereof, wherein thermal damage to a reducing agent injection valve can be prevented, and crystallization of a urea solution caused by excessive cooling of a liquid reducing agent can be prevented. A reducing agent supply device, which is used in an exhaust gas purification device for injecting and supplying a urea solution as a reducing agent to an exhaust gas upstream side of a reduction catalyst disposed in an exhaust passage of an internal combustion engine and reducing and purifying nitrogen oxides in exhaust gas in the reduction catalyst, and which is provided with a reducing agent injection valve fixed to an exhaust pipe on the exhaust gas upstream side of the reduction catalyst, the reducing agent supply device comprising: a cooling water circulation passage for circulating at least a part of the cooling water of the internal combustion engine in order to cool the reducing agent injection valve; a flow rate control mechanism for adjusting a flow rate of the cooling water flowing in the cooling water circulation passage; a temperature detection mechanism for detecting a temperature of the reducing agent injection valve; a control mechanism for controlling the flow control mechanism based on the temperature of the reducing agent injection valve.
Description
Technical field
Reducer feeding device that the present invention relates in Exhaust gas purifying device, use and controlling method.Be particularly related to urea liquid is used and make the reducer feeding device of structure of the cooling that is used for the cooling water circulation of internal-combustion engine cooling is carried out reducing agent injection valve and the controlling method of reducer feeding device as reducing agent.
Background technique
In the past, among the exhaust gas of discharging from internal-combustion engines such as diesel engines, include may to environment bring influence nitrogen oxide (below be called NO
X).As for this NO
XThe Exhaust gas purifying device that purifies and use, the known upstream side that reducing catalyst in being equipped on exhaust passageway arranged liquid reducers such as urea liquid are sprayed supply in the exhaust gas, in reducing catalyst with NO
XThe Exhaust gas purifying device (SCR system) that purifies of reduction selectively.
As a kind of form of such Exhaust gas purifying device, the Exhaust gas purifying device that liquid reducer is sprayed the mode in the outlet pipe that supplies to the reducing agent injection valve force feed of liquid reducer on being fixed on outlet pipe, by the open and close controlling reducing agent injection valve is arranged.In the Exhaust gas purifying device of such mode, using under the situation of urea liquid as liquid reducer, the excessive high temperature if urea liquid becomes, then urea adds water decomposition and crystallization before urea liquid is sprayed from reducing agent injection valve, and the supply system of liquid reducer might partially or even wholly stop up.Be conceived to this point, for the temperature maintenance with urea liquid gets enough lowly, the path of feed speed by sufficient urea liquid and heat-exchange fluid, the reduction NO that heat-exchange fluids such as engine coolant are passed through with respect to pipeline or sparger have been proposed
XThe method (with reference to patent documentation 1) of discharging.
In addition, although its control section of electromagnetic control type valve and relatively poor being directly installed on the outlet pipe of resin part heat resistance of using as this reducing agent injection valve, so be subjected to fire damage because of heat easily from the outlet pipe transmission.
So, though proposed to be to use fuel (HC) can improve to NO as the structure of reducing agent
XThe reducing agent of catalyzer adds the Exhaust gas purifying device with the diesel engine of the durability of sparger.More particularly, disclosing a kind of Exhaust gas purifying device, is the NO that possesses in the exhaust passageway that is installed in motor
XCatalyzer and be located at and compare NO
XCatalyzer is by the NO of the upstream side part of exhaust passageway
XReducing agent adds the Exhaust gas purifying device of diesel engine of the sparger of usefulness, the peripheral passage that possess the cooling water path that is located in the sparger, cooling water path is connected with the cooling water path of motor and make cooling water via peripheral passage circuit cycling mechanism (with reference to patent documentation 2) between the cooling water path of cooling water path and motor.
[patent documentation 1] special table 2001-518830 communique (claim 11, the 8th page of the 7th row～the 10 row)
[patent documentation 2] spy opens flat 9-96212 communique (institute's drawings attached in full)
Summary of the invention
But, under the situation about reducing agent injection valve being cooled off in the cooling water circulation that makes motor, because the circulating load of the cooling water of motor is relatively large, so reducing agent injection valve is cooled off expeditiously, on the other hand, because the circulating load of cooling water is a large amount of, so have the supercooled situation of reducing agent injection valve.The result,, urea liquid such except having in mind in patent documentation 1 becomes high temperature and decomposes in reducing agent supply system the crystallization of the urea that brings, and also the urea crystalsization that the solvent natural evaporation brings might take place near the spray orifice of reducing agent injection valve.
That is, because the cooling water of motor for example is maintained at about 70～80 ℃, so, then have the temperature of reducing agent injection valve to be cooled to for example situation about 80～100 ℃ if be in a large number to the circulating load of reducing agent injection valve circuit cooling water.On the other hand, even flow into the influence that aqueous solution of urea in the reducing agent supply valve is subjected to the heat of reducing agent injection valve, also under the state that is maintained less than 100 ℃ temperature, be sent to spray orifice.Thereby the aqueous solution of urea that sprays from reducing agent injection valve becomes below the boiling point in the exhaust passageway that approaches atmospheric state, so near not gasification promptly and easily attached to the spray orifice.Be maintained less than 100 ℃ aqueous solution of urea and approaching to become under the atmospheric environment state of separating out that brings because of natural evaporation that is easy to generate as the moisture of solvent, and add and near the spray orifice of reducing agent injection valve, produce flowing of exhaust gas, become the state of the natural evaporation of the moisture in the easier generation aqueous solution of urea, promoted separating out of urea.If near the crystallization of the urea the spray orifice such, reducing agent injection valve takes place, bring harmful effect then can for the spraying of aqueous solution of urea, and the obstruction of spray orifice might take place.
So, inventors of the present invention have carried out wholwe-hearted effort, the mechanism of the circulating load of equipment control cooling water in the reducer feeding device of the structure of the cooling of discovery by carrying out urea liquid in the cooling water circulation that makes motor, can solve such problem, finish the present invention.That is, the purpose of this invention is to provide by according to the circulating load of the temperature regulation cooling water of reducing agent injection valve, can prevent the fire damage of reducing agent injection valve and can prevent the reducer feeding device and the controlling method thereof of the crystallization of the urea liquid that liquid reducer is brought by supercooling.
According to the present invention, a kind of reducer feeding device is provided, in that being sprayed as reducing agent in the Exhaust gas purifying device supply to the exhaust-gas upstream side of the reducing catalyst in the exhaust passageway that is provided in internal-combustion engine, in reducing catalyst the reduction of the nitrogen oxide in the exhaust gas to be purified, uses urea liquid, possess exhaust-gas upstream side at reducing catalyst and be fixed on reducing agent injection valve on the outlet pipe, it is characterized in that, possess: the cooling water peripheral passage is used for for the reducing agent injection valve cooling being made at least a portion circulation of the cooling water of internal-combustion engine; Flow control mechanism is used for being adjusted in the cooling water peripheral passage flow of the cooling water that flows; Temperature testing organization is used for detecting the temperature of reducing agent injection valve; Control mechanism is used for temperature control flow rate control mechanism based on reducing agent injection valve; Can address the above problem.
In addition, when constituting reducer feeding device of the present invention, preferably, control mechanism control flow rate control mechanism is a heat resisting temperature less than reducing agent injection valve with the temperature maintenance with reducing agent injection valve.
In addition, when constituting reducer feeding device of the present invention, preferably, control mechanism control flow rate control mechanism is more than the boiling point of urea liquid with the temperature maintenance with reducing agent injection valve.
In addition, when constituting reducer feeding device of the present invention, preferably, temperature testing organization is based on the front end temperature of temperature, ambient atmos temperature and at least one the computing reducing agent injection valve from the injection delivery volume of reducing agent injection valve of the temperature of the flow of the temperature of exhaust gas, exhaust gas, liquid reducer, cooling water.
In addition, when constituting reducer feeding device of the present invention, preferably, when establishing cooling water peripheral passage, flow control mechanism and control mechanism and be respectively the 1st cooling water peripheral passage, the 1st flow control mechanism and the 1st control mechanism, possess: the 2nd cooling water peripheral passage makes at least a portion circulation of the cooling water of internal-combustion engine for the temperature of the urea liquid in the storage tank of regulating stored urea solution; The 2nd flow control mechanism is used for being adjusted in the 2nd cooling water peripheral passage flow of the cooling water that flows; The 2nd control mechanism is used for controlling the 2nd flow control mechanism based on the temperature of the urea liquid in the storage tank.
In addition, another technological scheme of the present invention is a kind of controlling method of reducer feeding device, described reducer feeding device is spraying liquid reducer the exhaust-gas upstream side that supplies to the reducing catalyst in the exhaust passageway that is provided in internal-combustion engine, use in the Exhaust gas purifying device that in reducing catalyst, the reduction of the nitrogen oxide in the exhaust is purified, possess exhaust-gas upstream side at reducing catalyst and be fixed on reducing agent injection valve on the outlet pipe, the controlling method of described reducer feeding device is characterised in that, at least a portion circulation of the cooling water by making internal-combustion engine and reducing agent injection valve is cooled off; Detect the temperature of reducing agent injection valve, and the flow of control cooling water, with the temperature maintenance of fuel control valve in predetermined range.
According to reducer feeding device of the present invention, utilize the cooling water of internal-combustion engine, cool off reducing agent injection valve expeditiously, Yi Bian and detect the front end temperature of reducing agent injection valve, one side is according to the flow of its temperature regulation cooling water, so prevent the reducing agent injection valve supercooling.Thereby, prevent the fire damage of reducing agent injection valve, and prevent reducing agent injection valve the spray orifice vicinity urea crystallization and realize the stable spraying of reducing agent.
In addition, in reducer feeding device of the present invention, control mechanism is controlled, so that the temperature maintenance of reducing agent injection valve is less than heat resisting temperature, prevents the fire damage of reducing agent injection valve thus reliably.
In addition, in reducer feeding device of the present invention, control mechanism control so that the temperature maintenance of reducing agent injection valve more than the boiling point of urea liquid, thus, be exposed to urea liquid in the outlet pipe and mutually combine with exhaust heat and gasify rapidly, prevent crystallization reliably at the urea of spray orifice vicinity.
In addition, in reducer feeding device of the present invention, temperature testing organization is the mechanism of the front end temperature of computing reducing agent injection valve, and new thus serviceability temperature sensor can utilize in the past apparatus structure to infer the front end temperature of reducing agent injection valve.
In addition, in reducer feeding device of the present invention, utilize the temperature of the urea liquid in the chilled water modulation storage tank of internal-combustion engine, the temperature that prevents urea liquid thus is to spray from reducing agent injection valve under the following state of boiling point, prevents the crystallization at the urea of spray orifice vicinity more reliably.
In addition, controlling method according to reducer feeding device of the present invention, when cooling off reducing agent injection valve in the cooling water circulation that makes internal-combustion engine, circulating load based on the temperature regulation cooling water of reducing agent injection valve, prevent the fire damage of reducing agent injection valve thus, and prevent the crystallization of the urea that the reducing agent injection valve supercooling is brought.Thereby, realize the stable spraying of reducing agent.
Description of drawings
Fig. 1 is the figure of the structure example of expression Exhaust gas purifying device.
Fig. 2 is the block diagram that expression is equipped in the structure example of the reducer feeding device control gear (DCU) in the Exhaust gas purifying device.
Fig. 3 is the flow chart of a temperature controlled example of the reducing agent injection valve of the expression cooling water that uses internal-combustion engine.
Fig. 4 is the flow chart of a temperature controlled example of the aqueous solution of urea of the expression cooling water that uses internal-combustion engine.
Embodiment
Below, with reference to accompanying drawing, the mode of execution of the controlling method of relevant reducer feeding device of the present invention and reducer feeding device is specifically described.But this mode of execution is represented a kind of form of the present invention, does not limit the present invention, can at random change within the scope of the invention.
In addition, in each figure, represent identical parts and suitably omit explanation about the part of giving same reference numerals.
1, Exhaust gas purifying device
At first, with reference to Fig. 1 one example of the structure of the Exhaust gas purifying device of the reducer feeding device that is equipped with present embodiment is described.
Exhaust gas purifying device 10 shown in Figure 1 is to supply to the upstream side of the reducing catalyst 13 that is provided in the exhaust passageway with spraying as the aqueous solution of urea of liquid reducer, will be included in the NO among the exhaust gas in reducing catalyst 13
XThe Exhaust gas purifying device 10 that purifies of reduction selectively.This Exhaust gas purifying device 10 be provided in the outlet pipe 11 that is connected to internal-combustion engine 5 midway, be used for the NO that will be included in the exhaust gas
XHai Yuan reducing catalyst 13 and comprising is used for upstream side at reducing catalyst 13 and aqueous solution of urea is sprayed the reducer feeding device 20 that supplies to the reducing agent injection valve 31 in the outlet pipe 11 constitutes for main key element selectively.
2, reducer feeding device
The reducer feeding device 20 in the Exhaust gas purifying device 10 of being equipped in of present embodiment possesses upstream side at reducing catalyst 13 and is fixed to reducing agent injection valve 31 on the outlet pipe 11, store the storage tank 50 of aqueous solution of urea, comprise the pump module 40 of the aqueous solution of urea in the storage tank 50 pump 41 of reducing agent injection valve 31 force feeds, with the control gear that carries out the control of reducing agent injection valve 31 and pump 41 (below be called " DCU:Dosing Control Unit ") 60 in order to control in outlet pipe 11 emitted dose of spraying the reducing agent of supplying with.In addition, pump module 40 is connected by the 1st supply passage 58 with reducing agent injection valve 31, and storage tank 50 is connected by the 2nd supply passage 57 with pump module 40, and then pump module 40 is connected by peripheral passage 59 with storage tank 50.
As reducing agent injection valve 31, for example use the ON-OFF valve of controlling the ON-OFF that controls out valve by DUTY.Kept with the pressure of regulation from the aqueous solution of urea of 40 pairs of reducing agent injection valve 31 force feeds of pump module, when by the control signal that sends from DCU60 reducing agent injection valve 31 being opened, aqueous solution of urea is injected in the exhaust passageway.
In addition, in reducing agent injection valve 31, be provided with cooling water path 37, utilize the cooling water of internal-combustion engine 5 to carry out the cooling of reducing agent injection valve 31.In the example of the reducer feeding device 20 of present embodiment, the 1st cooling water peripheral passage 85 that possesses the cooling water path 37 that comprises reducing agent injection valve 31, the cooling water of internal-combustion engine 5 circulates in the cooling water path 75 at internal-combustion engine 5 under the effect of cooling water circulating pump 73, and, also flow in the 1st cooling water peripheral passage 85 from cooling water path 75 branches.The cooling water that flow in the 1st cooling water peripheral passage 85 is got back in the cooling water path 75 of internal-combustion engine 5 once more by the cooling water path 37 that is located in the reducing agent injection valve 31 halfway, carried out the cooling of reducing agent injection valve 31.
Ratio reducing agent injection valve 31 in the 1st cooling water peripheral passage 85 leans on upstream side, possesses the 1st cooling water flow control valve 81 of the flow that is used for being adjusted in the cooling water that flows in the 1st cooling water peripheral passage 85.As the 1st cooling water flow control valve 81, for example use ON-OFF valve, the solenoid-operated proportional flow control valve of electromagnetic control type, by DCU60 control described later.The 1st cooling water flow control valve 81 is set as out valve usually, by cooling water reducing agent injection valve 31 is cooled off.On the other hand, under reducing agent injection valve 31 might be by supercooled situation, the 1st cooling water flow control valve 81 is closed valve and cuts off the circulation of cooling water, the aperture of the 1st cooling water flow control valve 81 is reduced and the flow of cooling water is reduced, regulate so that reducing agent injection valve 31 not by supercooling.
In addition, entrance part office in the 1st supply passage 58 on being connected reducing agent injection valve 31, reducing agent injection valve 31 possesses the temperature transducer 33 that is used for detecting the temperature that flow into the aqueous solution of urea in the reducing agent injection valve 31.And then the entrance part office of upstream side in the 1st cooling water peripheral passage 85, reducing agent injection valve 31 possesses the temperature transducer 35 that is used for detecting the temperature that flow into the cooling water in the reducing agent injection valve 31.Be transmitted to DCU60 by these temperature transducer 33,35 detected temperature informations.
In addition, in the reducer feeding device 20 of present embodiment, by upstream side, also branch is provided with the 2nd cooling water peripheral passage 87 by the 1st cooling water flow control valve 81 of the ratio from the 1st cooling water peripheral passage 85 of cooling water path 75 branches of internal-combustion engine 5.The 2nd cooling water peripheral passage 87 set into, it is passed through in the storage tank 50, collaborate once more in the 1st cooling water peripheral passage 85.In addition, the ratio storage tank 50 in the 2nd cooling water peripheral passage 87 possesses the 2nd cooling water flow control valve 83 of the flow that is used for being adjusted in the cooling water that flows in the 2nd cooling water peripheral passage 87 by upstream side.
The cooling water of circuit internal-combustion engine 5 is that the heating machanism that is used as the aqueous solution of urea in the storage tank 50 uses in the 2nd cooling water peripheral passage 87.Because the cooling water of internal-combustion engine 5 is maintained at for example about 70～80 ℃, so when the temperature of the aqueous solution of urea in the storage tank 50 descends, the 2nd cooling water flow control valve 83 is driven valve and cooling water is recycled in the storage tank 50, control so that the temperature of aqueous solution of urea excessive descent or aqueous solution of urea do not freeze etc.
About the 2nd cooling water flow control valve 83, also same with the 1st cooling water flow control valve 81, the ON-OFF valve or the solenoid-operated proportional flow control valve of use electromagnetic control type are controlled by DCU60.Promptly, in the storage tank 50 that stores aqueous solution of urea, possess and be used for the temperature transducer 51 of temperature of the aqueous solution of urea in the detection case, will export DCU60 as signal, control the 2nd cooling water flow control valve 83 based on this temperature information by temperature transducer 51 detected values.
In addition, in pump module 40, possess pump 41, the aqueous solution of urea in the storage tank 50 drawn via the 2nd supply passage 57, and via the 1st supply passage 58 to reducing agent injection valve 31 force feeds.This pump 41 for example is made of the electric gear wheel pump, can carry out DUTY control by the signal that sends from DCU60.In addition, possess pressure transducer 43 in the 1st supply passage 58, will export to DCU60 as signal by pressure transducer 43 detected values, the driving DUTY of control pump 41 is to be maintained specified value with the force value in the 1st supply passage 58.Promptly, pressure ratio specified value in the 1st supply passage 58 descends under such state, control so that the driving DUTY of pump 41 becomes big, under the such state of the pressure ratio specified value rising the 1st supply passage 58 in, control so that the driving DUTY of pump 41 diminishes.
In addition, so-called " the driving DUTY of pump " is meant the shared ratio of driving time of pump in PWM (pulse widthmodulation) control, in per 1 cycle.
In addition, in the 1st supply passage 58, possess main filter 47, capture the foreign matter in the aqueous solution of urea of reducing agent injection valve 31 force feeds.In addition, be provided with peripheral passage 59, be connected on the storage tank 50 from the 1st supply passage 58 branches between pump 41 and the main filter 47.This peripheral passage 59 possess throttle orifice 45 midway, and possessing pressure controlled valve 49 by storage tank 50 sides than throttle orifice 45.By possessing such peripheral passage 59, under by the state of quilt based on the pump 41 force feed aqueous solution of urea of the checkout value feedback control of pressure transducer 43, force value in the 1st supply passage 58 has surpassed under the situation of specified value, valve left by pressure controlled valve 49, and the part of aqueous solution of urea is back in the storage tank 50.Pressure controlled valve 49 for example uses known safety check etc.
In addition, in pump module 40, possesses selector valve (reverting valve) 71, do not carry out at reducer feeding device 20 will comprising that the aqueous solution of urea of the reducing agent supply system of pump module 40 and reducing agent injection valve the 31, the 1st supply passage the 58, the 2nd supply passage 57 etc. is recovered in the storage tank 50 under the situation of injection control etc. of aqueous solution of urea.Thereby, under the temperature conditions that aqueous solution of urea is not easy to freeze when cold etc., make internal-combustion engine 5 stop, not carrying out under the such situation of the control of reducer feeding device 20, prevent the freezing of aqueous solution of urea in the reducing agent supply system, and then during the running of beginning internal-combustion engine, make not have that to stop up the injection that brings bad.
This selector valve 71 for example be have with the stream of aqueous solution of urea by from storage tank 50 towards the suitable direction of pump module 40 switching valve to the function of switching towards the opposite direction of storage tank 50 from pump module 40, when the ignition switch of internal-combustion engine is closed, aqueous solution of urea is recovered in the storage tank 50 by stream being switched in the other direction.
In addition, possesses heater 92～97 respectively at each position of the reducing agent supply system of reducer feeding device 20.These heaters 92～97th are for aqueous solution of urea such as when cold is present under the situation in the reducing agent supply system, prevents that aqueous solution of urea from freezing and partially or completely reducing agent supply system is stopped up, can not correctly utilize the injection control of reducing agent of reducing agent injection valve 31 and equipment.In addition, these heaters 92～97 are subjected to DCU60 control energising.For example, based on the temperature of aqueous solution of urea and ambient atmos temperature etc. and be judged as and be in that aqueous solution of urea freezes such following time of temperature conditions in the reducing agent supply system, heat from the battery service voltage.
Also be not particularly limited about these heaters 92～97, for example use electric heating wire etc.
3, the control gear of reducer feeding device (DCU)
Fig. 2 represents to be used for to control the structure of DCU60 of the reducer feeding device of present embodiment.This DCU60 is that the center constitutes with the microcomputer that is made of known structure, for the part of the action control of the 1st cooling water flow control valve 81 of relevant Fig. 1 and the 2nd cooling water flow control valve 83, the structure example that the piece of presentation function is represented.
The DCU60 of present embodiment constitutes for main key element with the injection valve temperature detecting part (being labeled as " Injector-Temp detections ") of the temperature that detects reducing agent injection valve, the 2nd control device (being labeled as " Tank-Heating control ") etc. controlling the 1st control device (being labeled as " Injector-Cooling control ") of the 1st cooling water flow control valve and control the 2nd cooling water flow control valve.These each ones particularly carry out by the program of utilizing microcomputer (not shown) and realize.
Wherein, the injection valve temperature detecting part detects the temperature of reducing agent injection valve, sends temperature information to the 1st control device.Detecting method about the temperature of reducing agent injection valve is not particularly limited, and both temperature transducer can be equipped on the reducing agent injection valve and directly detect, and perhaps also can infer by computing.
In the DCU60 of present embodiment, the injection indicated value Qu that the injection valve temperature detecting part transmits to reducing agent injection valve based on the temperature T u1 of the aqueous solution of urea in the exhaust gas temperature T g that infers according to the operating condition of internal-combustion engine and exhaust gas flow Ve, the storage tank, the temperature T u2 that flow into the aqueous solution of urea in the reducing agent injection valve, the temperature T r that flow into the cooling water in the reducing agent injection valve, ambient atmos temperature T o, from DCU60 and each information of car speed S are inferred the front end temperature T i of reducing agent injection valve.
The front end temperature T i that infers reducing agent injection valve by the injection valve temperature detecting part is because near the temperature the spray orifice of the crystallization of the urea that can bring based on the evaporation of the moisture in the easy generation aqueous solution of urea is controlled the flow of cooling water.Be in addition because, with the reducing agent injection valve heating is by carrying out via the exhaust heat of outlet pipe transmission, as long as will be below the heat resisting temperature, reducing agent injection valve integral body be become below the heat resisting temperature as the temperature maintenance of the fore-end of the reducing agent injection valve of the highest temperature.
In addition, when inferring the front end temperature T i of reducing agent injection valve, do not need, as long as infer just passable based on their a part of information with reference to above-mentioned all information.
In addition, in the 1st control device of the control of carrying out the 1st cooling water flow control valve, export the control signal of the switching of the 1st cooling water flow control valve based on the front end temperature T i of the reducing agent injection valve that sends from the injection valve temperature detecting part.
For example, when the common running of internal-combustion engine, the 1st cooling water flow control valve is opened and relatively large cooling water is circulated in the 1st cooling water peripheral passage 85, be maintained less than heat resisting temperature with front end temperature T i with reducing agent injection valve.To be used for making the resin part of reducing agent injection valve and Electromagnetic Control portion be the following front end temperature T i of heat resisting temperature according to the kind of reducing agent injection valve and difference for example makes the cooling water circulation be discontented with front end temperature T i is maintained 140～160 ℃.
On the other hand, the crystallization of urea then might take place in the water supercooling if reducing agent injection valve is cooled near spray orifice, so the 1st cooling water flow control valve is closed cooling water is cut off, and aperture is diminished and the flow of cooling water is descended.For example, gasify for the aqueous solution of urea that sprays by spray orifice is promptly evaporated, the flow of regulating cooling water is maintained more than the boiling point of aqueous solution of urea with the front end temperature T i with reducing agent injection valve.Though the boiling point of aqueous solution of urea changes according to concentration, the flow of for example regulating cooling water is to be maintained front end temperature T i more than 100～110 ℃.
Promptly, in the 1st control device of the DCU60 of present embodiment, information based on the front end temperature T i of the reducing agent injection valve that sends from the injection valve temperature detecting part, the switching of feedback control the 1st cooling water flow control valve so that the front end temperature T i of reducing agent injection valve is the boiling point of the aqueous solution of urea in the exhaust passageway is above, less than the heat resisting temperature of reducing agent injection valve.As a result, can prevent reducing agent injection valve fire damage, improve durability, and can prevent reducing agent injection valve the spray orifice vicinity urea crystallization and carry out the spraying of stable aqueous solution of urea.
In addition, in the example of present embodiment, control so that the front end temperature T i of reducing agent injection valve becomes more than the boiling point of aqueous solution of urea, if but make that aqueous solution of urea is subjected to the influence of exhaust heat and promptly gasifies after injection, front end temperature T i also can be less than the boiling point of aqueous solution of urea.
In addition, the 2nd control device is based on exporting the control signal of the switching of the 2nd cooling water flow control valve by the temperature that is equipped in the detected aqueous solution of urea of temperature transducer in the storage tank.
For example, if the temperature of the aqueous solution of urea in the storage tank is under the freezing point, then aqueous solution of urea freezes and no longer can supply with reducing agent injection valve.In addition, under situation about surpassing under the freezing point, if for example be that aqueous solution of urea also might go bad more than 80 ℃.
Therefore, in the 2nd control device of the DCU60 of present embodiment, the temperature of the aqueous solution of urea in storage tank by the 2nd cooling water flow control valve is opened, with the heating of the aqueous solution of urea in the storage tank, prevents freezing of aqueous solution of urea during less than 60 ℃.On the other hand, when the temperature of the aqueous solution of urea in storage tank becomes more than 60 ℃,, stop the heating that the cooling water by internal-combustion engine carries out, prevent aqueous solution of urea rotten in the storage tank by the 2nd cooling water flow control valve is closed.
4, reducing agent sprays control
Then, the reducing agent that is undertaken by the reducer feeding device in the Exhaust gas purifying device 10 that is equipped in Fig. 1 20 being sprayed control describes.
When the running of internal-combustion engine, the liquid reducer in the storage tank 50 is drawn by pump 41, to reducing agent injection valve 31 force feeds.At this moment, feedback is controlled so that the force value of its expression regulation based on the checkout value of the pressure transducer 43 in the 1st supply passage 58 in the downstream side that is equipped in pump 41.For example, the output that improves pump 41 under less than the situation of specified value at checkout value on the other hand, surpasses that the output that makes pump 41 under the situation of specified value reduces and liquid reducer is back in the storage tank 50 and reduces pressure via pressure controlled valve 49 in force value.Thus, the pressure that is pressed to the reducing agent of reducing agent injection valve 31 sides is maintained roughly certain value.
In addition, be maintained roughly certain force value, when reducing agent injection valve 31 is opened, be injected in the exhaust passageway by reducing agent from 40 pairs of reducing agent injection valve 31 force feeds of pump module.DCU60 based on the temperature of the operating condition of internal-combustion engine or delivery temperature, reducing catalyst 13, also have measure in the downstream side of reducing catalyst 13, be not reduced and passed through the NO of reducing catalyst 13
XThe injection delivery volume of the reducing agent that the information decision of amount etc. should be sprayed generates the control signal corresponding to it, to reducing agent injection valve 31 outputs.Reducing agent injection valve 31 carries out DUTY control by this control signal, the reducing agent of appropriate amount is sprayed supply in the exhaust passageway.The reducing agent that is injected in the exhaust passageway flow in the reducing catalyst 13, is used to be included in the NO in the exhaust gas
XReduction reaction.
5, cooling water loop control
Then, an example of the program of the loop control of the cooling water that the control gear (DCU) 60 of the reducer feeding device of present embodiment shown in Figure 2 is carried out with reference to Fig. 3 and control flow shown in Figure 4 describes.
At first, as shown in Figure 3, among the step S1 after beginning, detect the temperature of reducing agent injection valve.As mentioned above, in the DCU60 of present embodiment, based on the flow Ve of exhaust gas temperature T g, exhaust gas, temperature T u1, the temperature T u2 that flow into the aqueous solution of urea in the reducing agent injection valve, the temperature T r that flow into the cooling water in the reducing agent injection valve, ambient atmos temperature T o, the injection indicated value Qu that reducing agent injection valve is transmitted from DCU60 and each information of car speed S of aqueous solution of urea in the storage tank, the front end temperature T i of computing reducing agent injection valve.
Then, in step S2, judge whether the front end temperature T i of detected reducing agent injection valve is less than lower limit Ti1.In the present embodiment, lower limit Ti1 is set to the boiling point of aqueous solution of urea.And, under the front end temperature T i of reducing agent injection valve is situation less than lower limit Ti1, advance to step S3, after making the 1st cooling water flow control valve full cut-off or reducing aperture, turn back to beginning.As a result, the flow of the cooling water that flows in the cooling water path in being located at reducing agent injection valve is reduced, and be subjected to the influence by the exhaust heat of outlet pipe transmission, the front end temperature T i of reducing agent injection valve rises.
On the other hand, in step S2, under the front end temperature T i of reducing agent injection valve is situation more than the lower limit Ti1, advance to step S4, judge whether the front end temperature T i of reducing agent injection valve is more than the CLV ceiling limit value Ti2.In the present embodiment, CLV ceiling limit value Ti2 is set to the heat resisting temperature of reducing agent injection valve.And, under the front end temperature T i of reducing agent injection valve is situation less than CLV ceiling limit value Ti2, former state turns back to beginning, on the other hand, under front end temperature T i is situation more than the CLV ceiling limit value Ti2, advance to step S5, after making the 1st cooling water flow control valve standard-sized sheet or making the aperture increase, turn back to beginning.As a result, the flow of the cooling water that flows in the cooling water path in being located at reducing agent injection valve increases, and reducing agent injection valve is cooled, and front end temperature T i descends.
In the controlling method of the reducer feeding device of present embodiment, with the temperature control while of the reducing agent injection valve that is undertaken by the open and close controlling of above-mentioned the 1st cooling water flow control valve, the temperature control of the aqueous solution of urea in the storage tank that carries out being undertaken by the open and close controlling of the 2nd cooling water flow control valve.
Fig. 4 represents the temperature controlled flow process of the aqueous solution of urea in the storage tank, at first, in step S11, detects the temperature T u1 of the aqueous solution of urea in the storage tank.Under the situation of the reducer feeding device of present embodiment, read in by the detected temperature information of temperature transducer that is configured in the storage tank.
Then, in step S12, judge whether the temperature T u1 of detected aqueous solution of urea is below the reference value Tu0.The reference value Tu0 of this moment is that target is set at 60 ℃ with the aqueous solution of urea stay-in-grade temperature of keeping in the storage tank for example.
And, under the temperature T u1 of aqueous solution of urea is situation below the reference value Tu0, makes the 2nd cooling water flow control valve standard-sized sheet advancing to step S13 or make after aperture increases, turn back to beginning.As a result, by the cooling water that is maintained at 70～80 ℃ internal-combustion engine the aqueous solution of urea in the storage tank is heated.
On the other hand, surpassed at the temperature T u1 of detected aqueous solution of urea under the situation of reference value Tu0, the excessive temperature of the aqueous solution of urea in might storage tank rises and goes bad, so advance to step S14, after making the 2nd cooling water flow control valve full cut-off or reducing aperture, turn back to beginning.
Like this, by control with the temperature maintenance of the aqueous solution of urea in the storage tank in 60～80 ℃ scope for example, prevent aqueous solution of urea freeze and rotten, and, be distributed in the exhaust gas equably easily when reducing agent injection valve sprays, promptly being gasified.
In addition, in the example of the open and close controlling of the 2nd cooling water flow control valve of present embodiment, the temperature T u1 that only judges aqueous solution of urea carries out flow control above still not surpassing reference value Tu0, but also can determine the 2nd reference value Tu2 different again with reference value Tu0, with the further sectionalization of scope of the temperature of the aqueous solution of urea in the storage tank, carry out the cooling control of the aqueous solution of urea in the storage tank that the cooling water by internal-combustion engine carries out.
Claims (6)
1. reducer feeding device, in that being sprayed as reducing agent in the Exhaust gas purifying device supply to the exhaust-gas upstream side of the reducing catalyst in the exhaust passageway that is provided in internal-combustion engine, in above-mentioned reducing catalyst the reduction of the nitrogen oxide in the exhaust gas to be purified, uses urea liquid, possess exhaust-gas upstream side at above-mentioned reducing catalyst and be fixed on reducing agent injection valve on the outlet pipe, it is characterized in that possessing:
The cooling water peripheral passage is used for for above-mentioned reducing agent injection valve cooling being made at least a portion circulation of the cooling water of above-mentioned internal-combustion engine;
Flow control mechanism is used for being adjusted in the above-mentioned cooling water peripheral passage flow of the above-mentioned cooling water that flows;
Temperature testing organization is used for detecting the temperature of above-mentioned reducing agent injection valve;
Control mechanism is used for controlling above-mentioned flow control mechanism based on the temperature of above-mentioned reducing agent injection valve.
2. reducer feeding device as claimed in claim 1 is characterized in that above-mentioned control mechanism is controlled above-mentioned flow control mechanism, is heat resisting temperature less than above-mentioned reducing agent injection valve with the temperature maintenance with above-mentioned reducing agent injection valve.
3. reducer feeding device as claimed in claim 1 or 2 is characterized in that above-mentioned control mechanism is controlled above-mentioned flow control mechanism, is more than the boiling point of above-mentioned urea liquid with the temperature maintenance with above-mentioned reducing agent injection valve.
4. as each described reducer feeding device in the claim 1～3, it is characterized in that said temperature feeler mechanism is based on the front end temperature of temperature, ambient atmos temperature and the above-mentioned reducing agent injection valve of at least one computing from the injection delivery volume of above-mentioned reducing agent injection valve of the flow of the temperature of above-mentioned exhaust gas, above-mentioned exhaust gas, the temperature of aforesaid liquid reducing agent, above-mentioned cooling water.
5. as each described reducer feeding device in the claim 1～4, it is characterized in that,
When establishing above-mentioned cooling water peripheral passage, above-mentioned flow control mechanism and above-mentioned control mechanism and be respectively the 1st cooling water peripheral passage, the 1st flow control mechanism and the 1st control mechanism,
Possess:
The 2nd cooling water peripheral passage makes at least a portion circulation of the cooling water of above-mentioned internal-combustion engine for the temperature of regulating the above-mentioned urea liquid in the storage tank that stores above-mentioned urea liquid;
The 2nd flow control mechanism is used for being adjusted in above-mentioned the 2nd cooling water peripheral passage flow of the above-mentioned cooling water that flows;
The 2nd control mechanism is used for controlling above-mentioned the 2nd flow control mechanism based on the temperature of the urea liquid in the above-mentioned storage tank.
6. the controlling method of a reducer feeding device, described reducer feeding device uses in liquid reducer being sprayed the Exhaust gas purifying device that supplies to the exhaust-gas upstream side of the reducing catalyst in the exhaust passageway that is provided in internal-combustion engine, in above-mentioned reducing catalyst the reduction of the nitrogen oxide in the above-mentioned exhaust is purified, possess exhaust-gas upstream side at above-mentioned reducing catalyst and be fixed on reducing agent injection valve on the outlet pipe, the controlling method of described reducer feeding device is characterised in that
At least a portion circulation of the cooling water by making above-mentioned internal-combustion engine and with above-mentioned reducing agent injection valve cooling;
Detect the temperature of above-mentioned reducing agent injection valve, and control the flow of above-mentioned cooling water, with the temperature maintenance of above-mentioned fuel control valve in predetermined range.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007272370A JP2009097479A (en) | 2007-10-19 | 2007-10-19 | Device and method for controlling reducing agent supplying device |
| JP2007-272370 | 2007-10-19 | ||
| PCT/JP2008/065641 WO2009050948A1 (en) | 2007-10-19 | 2008-09-01 | Controller of reducing agent supply unit and method of controlling the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101828011A true CN101828011A (en) | 2010-09-08 |
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ID=40567225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880112164A Pending CN101828011A (en) | 2007-10-19 | 2008-09-01 | Control device and control method for reducing agent supply device |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20100242439A1 (en) |
| JP (1) | JP2009097479A (en) |
| CN (1) | CN101828011A (en) |
| WO (1) | WO2009050948A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20100242439A1 (en) | 2010-09-30 |
| JP2009097479A (en) | 2009-05-07 |
| WO2009050948A1 (en) | 2009-04-23 |
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