CN105587379A - DPF regeneration device and method - Google Patents
DPF regeneration device and method Download PDFInfo
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- CN105587379A CN105587379A CN201410560574.4A CN201410560574A CN105587379A CN 105587379 A CN105587379 A CN 105587379A CN 201410560574 A CN201410560574 A CN 201410560574A CN 105587379 A CN105587379 A CN 105587379A
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Abstract
A DPF regeneration device is characterized by comprising a fuel injector and a controller, and the device is arranged in a diesel engine exhaust processing system comprising at least one particle filter (DPF); the fuel injector is an electric pulse-type injection unit controlled by a pump end, and comprises an electromagnetic drive linear electric pump, a high pressure convey pipe, and a nozzle; the nozzle is a self-open poppet valve structure opened by pressure, the opening pressure is not smaller than 0.8MPa, and the nozzle is arranged on an upstream exhaust pipe of the filter; the controller controls the injection unit to work through a pulse modulation PWM drive signal, so the electric pump can generate pulse fuel oil high pressure so as to open the nozzle, thus spraying excellent fuel oil spray in an exhaust pipe. The DPF regeneration device is good in injection atomization performance, high in control precision, simple in structure, reliable in work, and strong in applicability; the engine particle filter regeneration system can effectively control engine particle discharge and HC discharge.
Description
Technical field
The invention belongs to engine exhaust post-processing technology field, the exhaust particulate that is specifically related to Diesel engine and direct spray petrol engine in cylinder filters fuel oil injection regenerative system and the control technology thereof of collector (DPF).
Background technology
Diesel engine with its high thermal efficiency and low carbon dioxide emission amount and become the most important motility device in the world today, is widely used in road and off roader, engineering machinery, stationary power equipment etc. In-cylinder direct-jet supercharging gasoline engine is also because than the high thermal efficiency of traditional gasoline engine and specific power, more and more universal in vehicular engine. But diesel engine and direct spray petrol engine in cylinder burning are supervened and can be endangered biological healthy multiple pollutant matter by major polluting atmosphere environment, comprise nitrogen oxide (NOx), particle (PM), hydrocarbon (HC) and carbon monoxide (CO) etc. Along with becoming increasingly conspicuous of human environment problem, the made laws discharge capacity of contaminated environment material of the various power set products of restriction of many countries, especially constantly adds sternly for the emission limit of vehicle, engineering machinery, generating equipment etc.
The Main Means of known solution diesel engine emissions problem is to adopt diesel exhaust aftertreatment technology, be included in various catalysts and trap are set in gas exhaust piping, for example diesel exhaust oxidation catalysis (DOC=DieselOxidizingCatalyst) device, particle oxidation (POC=ParticulateMatterOxidizingCatalyst) device, SCR (SCR=SelectiveCatalystReduction) device, lean burn exhaust NOx trapping (LNT=LeanNOxTrapping) device, diesel particulate filter (DPF=DieselParticulateFilter), etc.. these means are equally applicable to direct spray petrol engine in cylinder.
In above-mentioned engine exhaust post-processing technology, SCR and DPF even LNT need special accessory system, SCR need to quantitatively provide reducing agent, for example, quantitatively in blast pipe, spray diesel exhaust gas fluid (DEF=DieselExaustFluid) i.e. 32.5% aqueous solution of urea (adding blue liquid=AddBlue); And LNT and DPF need interval regeneration, in the time that the NOx trapping or particle reach capacity soon or permit maximum, NOx or the particle that need to take special measure contamination-freely to remove to trap. Otherwise SCR just can not have any reduction to NOx, LNT attracts deposit after saturated and also just cannot fall low NOx drainage at NOx, and the particle obstruction that DPF become trapped in can cause engine exhaust back pressure to raise, and makes engine performance deterioration. Therefore, these accessory systems are necessary and crucial.
The regeneration techniques of engine machine particle filter traps DPF can be divided into passive type regeneration and active regeneration from regeneration. Passive type regeneration is that the exhaust conditions of utilizing the high speed high load capacity operating mode of the engine that may exist to form makes the particle burning trapping, but be uncertain because user uses the pattern of engine, institute can not get rid of DPF plugging fault by this way, particularly for vehicle diesel engine, the probability that this operating mode occurs is very low, is substantially difficult to effective regeneration DPF. Active regeneration is the exhaust that produces at any time temperature that can ignition higher than DPF particle according to the DPF duty of monitoring, the specialized system that DPF is regenerated. Effective initiative regeneration DPF system reasonable in design is that DPF technology is successfully crucial.
Initiatively dpf regeneration has again variety of way, comprises that the main fuel injection system of engine adopts the tactful cylinder injection fuel oil of rear spray to improve the regeneration of delivery temperature; At the regeneration of blast pipe oil jetting combustion thermal exhaust; Regeneration of the engine particulate matter that uses electrical heating or heating using microwave to ignite in blast pipe or DPF to trap etc. Various regenerations have pluses and minuses separately. The dpf regeneration mode of cylinder injection fuel oil requires very high to main fuel injection system, the main fuel injection system that only has high-pressure common rail and can realize quick multiple-pulse oil spout can be realized, and may produce certain impact to main jet oil, demarcate and need to carry out together with engine performance demarcation, calibration cost is higher. Be easy to dilute crankcase machine oil because being ejected into cylinder wall surface in the oil spout of expansion or exhaust stroke in addition, engine running reliability is brought to threat. The regeneration of electrical heating or heating using microwave need to consume a large amount of electric energy, must increase generator power and the accumulator capacity of engine, and reliability or cost also have problems in addition. Use additional blast pipe fuel-injected regeneration, need to increase a fuel injection equipment (FIE). But all in all, blast pipe fuel-injected regeneration is because the advantages such as its flexibility, extensively adaptability and lower cost are maximum adopted methods.
Be arranged on the dpf regeneration mode in blast pipe oil spout, need to be to active fuel injected in discharge duct, in order to improve efficiency of combustion, obtain the highest dpf temperature and reach the object of the particle of regeneration DPF trapping with minimum fuel consume, the fuel of injection must atomization well and have a higher accuracy of spray. But, the most spraying techniques that adopt low pressure of prior art. For example, the disclosed technical scheme of United States Patent (USP) (publication number: US2007/0033927) has been used injection general principle and the nozzle arrangements metering fuel oil of gasoline port spraying system, because this measuring jet can not bear the hot environment of blast pipe, therefore this scheme has separately designed a pressure self-opening injection lift valve that can be arranged on blast pipe, metering control, away from blast pipe setting, is communicated with metering control and injection lift valve by a tube connector. Because what adopt is the isobaric metering system of low pressure of gasoline port spraying system, expulsion pressure is relatively low, and atomization is poor, and system component parts is more, complexity and cost is higher.
Chinese patent 200680027310.6(Granted publication CN101265824A) a kind of dpf regeneration fuel injection equipment (FIE) of lower cost disclosed, adopt switching mode (ON-OFF) solenoid control metering regeneration fuel oil to spray, provide the fuel oil of pressure fluctuation with the low pressure oil supply pump of main fuel injection system, maintain expulsion pressure mean value within the specific limits by a pressure-control valve, and nozzle is pressure self-opening, but can only work in the mode of vibration because of expulsion pressure pulsation, low when high when expulsion pressure, pressure is pulsed within the scope of 1-8bar. This metering method is difficult to obtain high accuracy, and same atomization is poor.
As the dpf regeneration system of above-mentioned blast pipe oil spout, adopt pressure self-opening nozzle to be arranged on blast pipe, because Tail Pipe Temperature is very high, nozzle and the fuel delivery line being connected with nozzle need to be born quite high temperature, therefore, for thereby self-opening nozzle that nozzle opening pressure can only be established lowlyer low for expulsion pressure, sealing is difficult to ensure, stopping between injection period, its inner trapped fuel is subject to high temperature for a long time, rotten carbon distribution or the deposit etc. of forming of fuel oil may be produced, the normal work of fuel nozzle can be affected. Chinese patent 200810007980.2(Granted publication CN101265824A) a kind of method that has pressure air purge nozzle, pipeline of the compressor output that utilizes Turbochargers in Diesel Engines disclosed, but need compressed air of peripheral hardware to collect and storage device, system complex, cost is high. Even adopt compressed air to realize this function on the device that has compressed air source, for example adopting on the commercial vehicle of pneumatic braking system, this nozzle cleaning system is also more complicated, and cost is high.
In addition, actual diesel engine delivery temperature is generally less than 500 DEG C, particularly bus and the light commercial vehicle of the operation of city operating mode, device engine exhaust temperature is even substantially always below 250 DEG C, therefore can spray into after blast pipe trouble-free burning for regeneration fuel oil, also be a problem that must solve, otherwise the DPF that not only can not regenerate may increase HC discharge on the contrary.
Summary of the invention
The present invention is directed to the problems referred to above, object be to be to provide that a kind of jet atomization performance is good, control accuracy is high, simple in structure, reliable operation, engine particulate matter filter regeneration that applicability is strong, effectively to realize the control that engine particulate matter discharge and HC are discharged.
For achieving the above object, the present invention takes following technical scheme, , a kind of dpf regeneration device, it is characterized in that: comprise fuel injector and controller, be arranged in the treatment of diesel exhaust system that comprises at least one particulate filter (DPF), described fuel injector is the electric pulse formula injection unit of pump end control, by the linear motor-driven pump of Electromagnetic Drive, high-pressure delivery pipe and nozzle composition, described nozzle is the self-opening poppet valve arrangements that relies on pressure to open, opening pressure is not less than 0.8MPa, be arranged in the upstream exhaust pipe of described filter, described controller is by injection unit work described in the driving signal of telecommunication control of impulse modulation (PWM), make described electrodynamic pump produce pulse fuel oil high-pressure and rely on this pressure to open described nozzle, forming good fuel spray is sprayed onto in blast pipe.
Dpf regeneration device of the present invention, the electric pulse formula injection unit of pump end control can produce the pulse higher than 1MPa, the opening pressure of nozzle is not less than 0.8MPa, therefore sealed nozzle is good, can ensure to install and reliably working on the exhaust pipe of engine, avoid nozzle carbon distribution inefficacy because of exhaust high temperature. Because expulsion pressure is high, fuel oil jet atomization is good, and can accurately control fuel injection amount and (utilize various known control theories and method, for example Chinese patent 200610079743.8), so be easy to form combustion mixture, trouble-free burning makes exhaust-gas temperature rising, regeneration DPF. The whole electric drives of spraying system, linear motor-driven pump does not need forced feed, and therefore on vehicle or engine, flexible arrangement is convenient, strong adaptability, and system formation is simple, is conducive to reduce costs. These are all the benefits that the present invention can bring, and goal of the invention is achieved.
Technical scheme has below been done further improvement or restriction to the present invention.
Technical scheme of the present invention, comprise a diesel exhaust gas oxidation catalyzer (DOC), be arranged between described nozzle and described filter, after forming gaseous mixture in blast pipe, the fuel spray that described nozzle ejection forms first enters described diesel exhaust gas oxidation catalyzer, burning is therein risen delivery temperature, and high-temperature exhaust air enters described filter.
DOC, generally just can ignition 240 DEG C of left and right because the effect of its catalytic specie can significantly promote to flow through the oxidizing fire reaction in its surperficial exhaust. Therefore, even if delivery temperature does not reach without the gaseous mixture autoignition temperature under catalytic condition, the fuel spray that nozzle ejection of the present invention forms also can take fire entering after DOC, delivery temperature is risen to can ignite the temperature (General Requirements is more than 500 DEG C) of particle, high-temperature exhaust air just can start to burn the wherein particle of trapping after entering described filter, starts regeneration.
The electric pulse formula injection unit of pump end of the present invention control, uses a high-pressure delivery pipe that nozzle is separated with electrodynamic pump, and electrodynamic pump can be arranged on the position away from blast pipe, thereby is not subject to the impact of blast pipe hot environment, reliably working. High-pressure delivery pipe must meet certain requirement, and for example internal diameter, between 0.5-3mm, is subject to the volumetric expansion amount of internal pressure effect to be less than 3%, and length is not more than 2000mm. High-pressure delivery pipe can be made with metal material or macromolecular material.
Dpf regeneration device of the present invention, also can comprise an igniter, for example, comprise an ignition spark plug by described controller control or glow plug. Spark plug or glow plug are positioned at the downstream of fuel injector along spray direction, so that the fuel-steam that spraying or spraying produce can arrive the bloom of spark plug or the high temperature position of glow plug. Even if the fuel spray gaseous mixture that therefore described nozzle ejection forms can not reach spontaneous combustion, also still can be lighted by igniter, ensure the validity of dpf regeneration (the particularly regeneration under the lower state of row's temperature).
In order to make igniting more reliable, the present invention can also comprise a conducting element, and spraying changes its distribution and direction by conducting element, and the fuel-steam that more spraying or spraying are produced arrives spark plug or glow plug place. This combustion system is similar to the combustion system of in-cylinder direct-jet spark ignition engine.
Dpf regeneration device of the present invention, also can comprise: one or more exhaust gas temperature sensor, be arranged on each position of described treatment of diesel exhaust system, comprise the upstream of described fuel nozzle, or the upstream of described diesel exhaust gas oxidation catalyzer, or the upstream of described filter and the downstream of described filter; An exhaust back pressure sensor or a differential pressure pickup, described exhaust back pressure sensor is arranged in the upstream exhaust pipe of described filter, and described differential pressure pickup is communicated with import and the outlet of described filter, exhaust resistance while operation to measure engine; A lambda sensor, is arranged on the upstream of described fuel nozzle, or the downstream of described DOC, or the downstream of described DPF, measures the oxygen concentration in exhaust.
There is described sensor, described controller just can judge present engine exhaust status, comprise pressure reduction before and after delivery temperature everywhere, exhaust back pressure, DPF, exhaust oxygen content etc., thereby determine whether to start dpf regeneration program, whether normally in regenerative process, detect regeneration, whether effective, whether the particle trapping is burnt completely.
The present invention also comprises the method that uses above-mentioned each technical scheme, that is: the method for DPF that regenerates a kind of, comprise the following steps: the master control ECU(electronic control unit of described control module and Diesel engine) communicate, obtain the engine operation condition parameters such as engine speed, load, extraction flow, air-fuel ratio; Exhaust resistance when control module detects delivery temperature and engine operation; Calculate the accumulated running time after dpf regeneration last time, predict the particle quality of a DPF trapping; If the particle quality of prediction has exceeded a default threshold value, or the exhaust resistance in engine when operation repeatedly exceeded certain threshold value, prepares at any time to start reproducer; When engine is greater than default minimum renewable temperature and density of oxygen contained in discharged gas in default scope time in running status and delivery temperature, start reproducer, send fuel injected instruction and firing command to electric pulse formula injection unit, and determine regeneration fuel oil emitted dose according to engine operation condition parameter at that time.
In engine, master control ECU may directly use air-fuel ratio signal, so the signal of described lambda sensor generally accesses master control ECU. The operation of master control ECU control engine, thus generally also measure or calculate engine operation condition and the state parameters such as engine speed, load, extraction flow, air-fuel ratio, and these data are dealt into CAN bus. Described control module can obtain these engine operation conditions and state parameter by CAN bus, then the gas extraction system of measuring in conjunction with oneself temperature, exhaust resistance etc. everywhere, judges whether to start dpf regeneration device.
Extraction flow equals the summation of air input of engine by air and fuel consumption, can calculate exhaust flow rate, the air speed etc. in each exhaust apparatus according to extraction flow. Exhaust section at from described electric pulse formula injection unit to blast pipe jet regeneration fuel spray, the excessive ignition difficulty that just likely makes of exhaust flow rate. In DOC, air speed is excessive, may just be difficult to make catalytic oxidation to carry out completely, and result wants that improving by the burning of dpf regeneration fuel oil the target that enters described filter just may be difficult to reach. Therefore, need in advance to set the threshold limit value of some parameters, do not reach these threshold values, just need not start dpf regeneration device, to prevent that spraying regeneration fuel oil increases HC discharge. These parameter thresholds comprise: the particle quality minimum threshold of the DPF trapping of the delivery temperature threshold value of minimum renewable DPF, the exhaust resistance minimum threshold of needs regeneration, needs regeneration etc. Exhaust resistance can be defined as the pressure reduction between the porting of exhaust back pressure under certain extraction flow condition or DPF filter. The particle quality of DPF trapping can be estimated by a forecast model, for example, taking engine running time or the running number of turns or accumulative total engine fuel consumption quantity as parameter, calculate for example proportional relation with the functional relation of certain monotone increasing. After regenerating, taking the minimum exhaust resistance that obtains after regenerating as benchmark, determine a forecast model initial value. The relation of this initial value and exhaust resistance can be demarcated in advance.
Because the back pressure in blast pipe or DPF filter intake and exhaust pressure reduction due to the variation of pressure wave transmission and extraction flow always in changing, so the calculating of exhaust resistance will be considered mean value and the peak value of exhaust back pressure, and relevant to extraction flow.
The present invention also comprises the method that uses above-mentioned each technical scheme, further comprising the steps of: after reproducer starts, if detect that engine operation stops, stopping immediately regeneration, and according to the particle quality of the variation correction DPF trapping of exhaust resistance; If after reproducer starts, engine keeps operation, keeps regeneration fuel oil to spray and electricity fire, detects the upstream of filter and the variations in temperature of downstream exhaust gas; If temperature rate-of-rise does not exceed default minimum target value, keep, after the shortest recovery time, being judged to be regenerative combustion failure, stop regeneration, the concurrent signal that is out of order; In regenerative process, if temperature rate-of-rise exceedes default minimum target value, continue to detect exhaust resistance and variations in temperature, when the temperature of DPF downstream exhaust gas reaches default higher limit, or exhaust resistance is less than after default regeneration desired value, stops immediately regenerating oil spout and igniting.
Once dpf regeneration starts, generally to continue 5～20 minutes, if during this engine stop running, should stop immediately the oil spout of regenerating, otherwise ejection fuel oil tends to become HC discharge, because will there is no new air supply in engine stop final vacuum pipe. If after dpf regeneration starts, the delivery temperature rising of finding DPF downstream does not reach requirement within a certain period of time, be that climbing speed does not exceed default minimum target value (threshold value), can conclude that so regeneration oil spout does not have active combustion, may be because certain fault of system causes, when regeneration oil spout has continued will to stop immediately after the shortest a period of time, controller sends a dpf regeneration system failure to CAN bus simultaneously. If do not stop in this case spraying dpf regeneration fuel oil, ejection fuel oil tends to become HC discharge.
When after regeneration, the delivery temperature climbing speed in DPF downstream has exceeded default minimum target value (threshold value), keeps so regeneration oil spout, once exhaust resistance drops to below regeneration targets threshold, illustrates that reproductive success completes, and can stop the oil spout of regenerating. If regeneration period, the delivery temperature in DPF downstream so also stops the oil spout of regenerating more than having risen to the threshold value of protection DPF immediately, drops to below regeneration targets threshold even if also may not reach exhaust resistance. Protect the delivery temperature threshold value in the DPF downstream of DPF, should be less than the maximum allowable temperature of DPF. Stopping regenerating after oil spout because of protection DPF, actual DPF may also can continue to keep regeneration, and exhaust resistance also can further decline.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Brief description of the drawings
Fig. 1 is the example structure schematic diagram of DPF assembly regenerating unit provided by the invention.
Fig. 2 is the fuel injector structural representation of PDF regenerating unit provided by the invention.
Fig. 3 is the nozzle arrangements schematic diagram of dpf regeneration device provided by the invention.
Fig. 4 is that nozzle and the spark plug of dpf regeneration device provided by the invention arranged schematic diagram.
Fig. 5 is the method block diagram of regeneration DPF provided by the invention.
Specific embodiment
Fig. 1 is the embodiment of dpf regeneration system provided by the invention, and the example given comprises fuel injector 1, filter 2, controller 3, spark plug 4, blast pipe 8, auxiliary fuel tank 9, flow deflector 13, temperature sensor 12 and 12a, 11, one lambda sensors 10 of differential pressure pickup.
Described fuel injector 1 is an electric pulse formula injection unit by the control of pump end, exports PWM electric drive pulse control by controller 3. Described fuel injector 1 comprises solenoid pump device (linear motor-driven pump) 5, nozzle 6, and high-pressure delivery pipe 7, and concrete structure schematic diagram is as shown in Figure 2. Give in pump installation structure chart at Fig. 2, described solenoid pump device 5 comprises solenoid driving device 101, plunger assembly 102, return spring 111, pump end 103, output housing 134 and filter screen 121.
Solenoid driving device 101 comprises coil 137, inner yoke 119, outside yoke 118, magnetic gap 117 and armature 113. Inner yoke 119, outer yoke 118 and armature 113 are made up of permeability magnetic material, and magnetic gap 117 is non-magnet material. Armature 113 is roughly a cylinder, comprises the through hole 114 that connects both ends of the surface. Described through hole 114 can have certain tapering, and the hole with tapering is to feeding liquid under pressure Directional Extension, to realize the directed flow of liquid in inner space, with the stability of cooling solenoid driving device 101 and its work of raising.
Plunger assembly 102 comprises sleeve 132, plunger 133, liquid feed valve 123 and liquid valve 129. Sleeve 132 is coaxially fixed on output housing 134, and sleeve 132 is provided with the spout hole 123a of side direction and axial plunger hole 131 is communicated with, and is axially arranged with liquid return hole 120 along periphery. Plunger 133 precisions are slidably matched and are contained in sleeve 132, and form force feed volume 131a, and its top contacts with armature 113 all the time by connector 112, and armature 113 can be also an entirety with plunger 133. Spout hole 123a and plunger end face 133a form feed liquor guiding valve 123. Liquid valve 129 is made up of fluid valve member 124, fluid valve spring 125 and fluid valve seat 130, and fluid valve seat 130 is the conical surface coordinating with fluid valve member 124, is positioned at sleeve 132 ends. Return spring 111 is arranged between plunger 133 and armature space 113a bottom, and spring force and driving force are reverse, orders about armature 113 and moves back and forth with plunger 133, so that force feed volume size checker forms working cycles.
Pump end 103 comprises back fluid passage 116 and pump end end face 103a. Described pump end end face 103a is used for limiting armature return-stroke, seals, and held tightly by outer yoke 118 between pump end 103 and inner yoke 119 by sealing ring 115.
Output housing 134 comprises tapping channel 126 and the female 134a that can dock with snap joint.
Nozzle 6 can be selected anti-coking and the strong lift valve formula structure of pollution capacity, and its structural representation as shown in Figure 3, comprises 140, one valve springs 139 of 142, one valve members of 144, one valve seats of a nozzle filter core and valve body 143. Valve body 143 outsides comprise a connecting thread 138, and an erecting bed 141.
Described high-pressure delivery pipe 7 can be a kind of easily deformable flexible pipe, can be also a kind of on-deformable rigid pipe. Flexible pipe can be the metal tube of thin-walled or the tubing that heat resistance macromolecular material is made, and can also be metal and nonmetallic multiple tube. High-pressure delivery pipe 7 two ends comprise respectively 127, one hickeys 136 that are connected with nozzle connecting thread 138 of quick-joint male head that dock with fuel injector 1 output housing snap joint 134a. Fuel injector 1 encloses 128 sealings with high-pressure delivery pipe 7 by o, and nozzle 6 encloses 135 sealings with high-pressure delivery pipe 7 by o.
Described fuel injector 1 can produce the impulse jet pressure higher than 1MPa, and wherein nozzle 6 opening pressures are greater than 0.8MPa, thereby easily guarantee of sealing, and anti-coking and pollution capacity are strong.
The course of work of fuel injector 1 is as follows.
At motion initial position, because the effect plunger 133 of return spring 111 is positioned at stroke top with armature 113, now liquid feed valve 123 is in opening, spout hole 123a is communicated with force feed volume 131a, the fuel oil being entered by liquid inlet channel 122 enters force feed volume 131a by spout hole 123a, is full of wherein. When armature 113 is subject to electromagnetic force driving descending, promote plunger 133 by connector 112 simultaneously, force feed volume 131a constantly reduces, once spout hole 123a is blocked by the wall 133a of plunger 133, liquid feed valve 123 is closed, force feed stroke starts, fluid pressure raises in force feed volume 131a, and then opens liquid valve 129, in the time acting on the pressure of liquid valve part 124 and can overcome the active force of fluid one-way valve spring 125, fluid check valve 129 is opened, and liquid enters tapping channel 126. When after the electromagnetic force disappearance acting on armature 113, under the effect of return spring 111, armature 113 starts return-stroke, now because of the expansion of force feed volume 131a cause pressure drop then fluid check valve 129 close, liquid feed valve 123 is opened, liquid enters rapidly force feed volume 131a under the effect of pressure reduction, when the continuation return of armature 113 is stopped and stops by pump bottom face 103a, this end that circulates.
In this process, the fuel oil entering by liquid inlet channel 122, together with bubble wherein, can enter low pressure volume 131a by liquid return hole 120, discharges from returning fluid passage 116, and the heat that magnetic coil 137 work simultaneously produce can pass through back the elimination of liquid stream or reduction.
In above-mentioned example, described controller 3 can be one for receiving master controller working signal and controlling the metering module that fuel injector 1 is worked, can be also the post processing controller of the independent DPF of a control system. Diesel particulate filter (DPF) 2 is installed on described blast pipe 8, can connects an oxidized form catalyst DOC14 before DPF, or on DPF filter direct noble metal-coating catalyst. After spark plug 4 is installed on nozzle 6, be positioned at DPF2 upstream, in the time of nozzle 6 ejection spraying, spark plug 4 is lighted a fire in good time, light regeneration fuel oil spraying, to improve delivery temperature, enter DPF2, thereby the particle taking soot as Main Ingredients and Appearance of collecting in the DPF2 that ignites reaches the effect of desirable regeneration DPF. The fuel oil spraying into from nozzle 6 in native system should be the least possible, but must make engine exhaust reach sufficiently high temperature, therefore requires fuel-oil atmozation good, distribute rationally, and sufficient combustion. Thereby the present invention selects anti-coking and the strong lift valve formula structure nozzle 6 of pollution capacity. Nozzle 6 upstreams comprise one and half flow deflectors 13 of encircling nozzle, and its view along discharge directions, as shown in 13a, also can comprise some through holes parallel with exhaust stream 19. Change spray direction and produce fuel-steam by the higher flow deflector 13 of temperature, simultaneously, flow deflector 13 also has choked flow effect, make exhaust stream 19 comparatively stable at its downstream area, the fuel-steam that spraying or spraying produce can arrive with effective form the region of discharge of spark plug 4, and forms the flame of smooth combustion.
The circumferential installation example of one of nozzle 6, spark plug 4 and flow deflector 13, as shown in Figure 4. In this embodiment, the lamellar body of flow deflector 13 is identical with exhaust 19 directions, and spark plug 4 can be installed on the same circumference comparatively approaching with nozzle 6, also can be positioned at nozzle 6 downstreams near nozzle 6 positions.
Due to the existence of igniter, regeneration fuel oil is sprayed at relatively low delivery temperature for example also may trouble-free burning under the condition of 100-250 DEG C, further, by DOC completing combustion, DPF is reliably regenerated. Therefore the present invention is particularly useful in the reduction of discharging with diesel engine.
In Fig. 1 embodiment, be provided with an auxiliary fuel tank 9, be arranged on fuel injector 1 to such an extent as to the fuel oil of auxiliary fuel tank 9 can enter fuel injector 1 by gravity forms normal fuel feeding. The oil return (preferably taking the form of series connection) of engine high pressure spraying system enters auxiliary fuel tank 9 by oil-in 15a, and then gets back to the main fuel tank of engine by oil return opening 16a. The fuel oil of auxiliary fuel tank 9 also can directly come from engine high pressure spraying system low pressure oil supply pump, or for example, gets oil by the effect of complementary pump (vavuum pump) or gravity from engine main fuel tank. From engine main fuel tank at least arranging one filtration system liquid fuel injector 1, if from the low pressure oil return of engine high pressure spraying system, can not need separately to add filter, otherwise can arrange again a fuel oil filter 121. Described fuel tank 9 comprises an in-line 15 being connected with combustion system of diesel engine oil return line (not shown) and an oil return line 16 being connected with main fuel tank (not shown). The oil-in 122 of fuel injector 1 imports from auxiliary fuel tank 9 fuel oil after filter 121 filters by oil inlet pipe 17, under the control of controller 3, pump oil is to playpipe 7, then spray into the exhaust pipe of engine 8 from nozzle 6, controller 3 metered injection oil mass simultaneously, judge that according to detected engine operating condition, DPF pressure drag, exhaust condition and dpf temperature (not shown) etc. whether sprayed oil mass is suitable, and whether need to continue. The upper space of fuel tank 9 is got back in the oil return of fuel injector 1 by oil return pipe 18. The liquid outlet 18a of auxiliary fuel tank 9 is positioned at bottom, and liquid return hole 17a is positioned at higher position, and fuel tank 9 still can normally be worked in the situation that oil reserve is few.
The course of work of the DPF system of the described embodiment of the present invention is as follows.
Filtered by DPF2 and progressively accumulation therein from the soot of engine, along with the increase of soot accumulation amount, pressure reduction △ P before and after DPF2 progressively increases, in the time that controller 3 detects that by differential pressure pickup 11 △ P is greater than particular value (or will affect the power stage of engine), or controller reaches according to the trapping amount of soot of model prediction in certain threshold value, if other conditions also meet regeneration DPF condition, controller 3 drive fuel injector 1 by nozzle 6 to fuel injected in the exhaust pipe of engine 8, control and drive spark plug 4 to light a fire to increase row's temperature with Time Controller 3. temperature sensor 12 catches delivery temperature in real time, when temperature during higher than certain value spark plug 4 quit work, in order to avoid overheated filter scaling loss. the pressure reduction △ P that differential pressure pickup 11 continues to detect DPF2 front and back, in the time that △ P is less than a certain particular value, thinks and has regenerated, oil spout and igniting stop regenerating. emitted dose can be set in advance in the memory of controller 3, also can carry out FEEDBACK CONTROL according to the sensor signal such as temperature and lambda sensor.
The method of the regeneration DPF of the embodiment of the present invention comprises: start after dpf regeneration program at every turn, controller is being controlled after fuel injector generation spraying, control described igniter and produce pilot spark at least one times, igniting is sprayed Synchronization Control with fuel oil, once spray and can repeatedly light a fire, after reproducer finishes, do not spray regeneration fuel oil, do not produce pilot spark yet.
The controller control logic block diagram that is illustrated in figure 5 the regeneration DPF of the embodiment of the present invention is given an example. First detect engine operation condition parameter, step 202; If engine, in operation, calculates the engine accumulated running time after dpf regeneration last time, the particle quality of prediction DPF trapping, step 203; If the particle quality of prediction has exceeded a default threshold value, step 206, or the exhaust resistance in engine when operation repeatedly exceeded certain threshold value, and step 205, prepares to start reproducer at any time; For example, when engine meets regeneration DPF condition (air speed is in particular range) and delivery temperature is greater than default minimum renewable temperature in running status and engine operation condition, step 207 and density of oxygen contained in discharged gas are in default scope time, step 208, start reproducer, send fuel injected instruction and firing command, step 209 to fuel injector.
Further, after reproducer starts, if detect that engine operation stops, stopping immediately regeneration, as step 216, and according to the particle quality of the variation correction DPF trapping of exhaust resistance; If after reproducer starts, engine keeps operation, keeps regeneration fuel oil to spray and electricity fire, detects the upstream of filter and the variations in temperature of downstream exhaust gas, as step 212; If temperature rate-of-rise does not exceed default minimum target value, keep, after the shortest recovery time, being judged to be regenerative combustion failure, stop regeneration, as step 216, the concurrent signal that is out of order; In regenerative process, if temperature rate-of-rise exceedes default minimum target value, continue to detect exhaust resistance and temperature, as step 213 and 214, when the temperature of downstream exhaust gas reaches default higher limit, or exhaust resistance is less than after default regeneration desired value, stops immediately the oil spout of regenerating, as step 216.
In said method, controller can communicate with the master control ECU of Diesel engine, to obtain the engine operation condition parameters such as engine speed, load, extraction flow, air-fuel ratio, according to the engine operation process after last time dpf regeneration, predict more exactly the particle quality that DPF traps again, to judge more accurately dpf regeneration condition and state. Certainly, controller also can be by gathering the bent axle footmark signal of engine, or tach signal or the engine output AC signal of telecommunication judge that engine is in running or has stopped, but be merely able to judge more cursorily dpf regeneration condition.
Above-mentioned example is only for the present invention is described, but do not limit the present invention, and all further change schemes based on Spirit Essence of the present invention all belong to the scope of the open and protection of the present invention.
Claims (10)
1. a dpf regeneration device, it is characterized in that: comprise fuel injector and controller, be arranged in the treatment of diesel exhaust system that comprises at least one particulate filter (DPF), described fuel injector is the electric pulse formula injection unit of pump end control, by the linear motor-driven pump of Electromagnetic Drive, high-pressure oil pipe and nozzle composition, described nozzle is the self-opening poppet valve arrangements that relies on pressure to open, opening pressure is not less than 0.8MPa, be arranged in the upstream exhaust pipe of described filter, described controller is by injection unit work described in the driving signal of telecommunication control of impulse modulation (PWM), make described electrodynamic pump produce pulse fuel oil high-pressure and rely on this pressure to open described nozzle, forming good fuel spray is sprayed onto in blast pipe.
2. dpf regeneration device as claimed in claim 1, it is characterized in that: comprise a diesel exhaust gas oxidation catalyzer (DOC), be arranged between described nozzle and described filter, after forming gaseous mixture in blast pipe, the fuel spray that described nozzle ejection forms first enters described diesel exhaust gas oxidation catalyzer, burning is therein risen delivery temperature, and high-temperature exhaust air enters described filter.
3. dpf regeneration device as claimed in claim 1 or 2, it is characterized in that: comprise an ignition spark plug, produce pilot spark by described controller control, described spark plug is positioned at the downstream of described fuel nozzle ejection spray direction, so that the fuel-steam that spraying or spraying produce can arrive spark plug gap place.
4. dpf regeneration device as claimed in claim 1 or 2, it is characterized in that: comprise an igniting glow plug, switched on by described controller control glow plug, described glow plug is positioned at the downstream of described fuel nozzle ejection spray direction, so that the fuel-steam that spraying or spraying produce can arrive glow plug place.
5. the dpf regeneration device as described in one of claim 1 to 4 item, it is characterized in that: comprise one or more exhaust gas temperature sensor, be arranged on each position of described treatment of diesel exhaust system, comprise the upstream of described fuel nozzle, or the upstream of described diesel exhaust gas oxidation catalyzer, or the upstream of described filter and the downstream of described filter.
6. dpf regeneration device as claimed in claim 5, it is characterized in that: comprise an exhaust back pressure sensor or a differential pressure pickup, described exhaust back pressure sensor is arranged in the upstream exhaust pipe of described filter, described differential pressure pickup is communicated with import and the outlet of described filter, exhaust resistance while operation to measure engine.
7. dpf regeneration device as claimed in claim 6, is characterized in that, comprises a lambda sensor, is arranged on the upstream of described fuel nozzle, or the downstream of described DOC, or the downstream of described DPF, measures the oxygen concentration in exhaust.
8. the dpf regeneration device as one of claim 1-7 described, is characterized in that, comprises a conducting element, and spraying changes itself and direction, fuel-steam arrival spark plug or glow plug place that more spraying or spraying are produced by conducting element.
9. a regenerate method of DPF, comprises the following steps: the master control ECU of control module and Diesel engine communicates, and obtains the engine operation condition parameters such as engine speed, load, extraction flow, air-fuel ratio; Exhaust resistance when control module detects delivery temperature and engine operation; Calculate the accumulated running time after dpf regeneration last time, predict the particle quality of a DPF trapping; If the particle quality of prediction has exceeded a default threshold value, or the exhaust resistance in engine when operation repeatedly exceeded certain threshold value, prepares at any time to start reproducer; When engine is greater than default minimum renewable temperature and density of oxygen contained in discharged gas in default scope time in running status and delivery temperature, start reproducer, send fuel injected instruction and firing command to electric pulse formula injection unit, and determine regeneration fuel oil emitted dose according to engine operation condition parameter at that time.
10. regenerate the as claimed in claim 9 method of DPF, further comprising the steps of: after reproducer starts, if detect that engine operation stops, stopping immediately regeneration, and according to the particle quality of the variation correction DPF trapping of exhaust resistance; If after reproducer starts, engine keeps operation, keeps regeneration fuel oil to spray and electricity fire, detects the upstream of filter and the variations in temperature of downstream exhaust gas; If temperature rate-of-rise does not exceed default minimum target value, keep, after the shortest recovery time, being judged to be regenerative combustion failure, stop regeneration, the concurrent signal that is out of order; In regenerative process, if temperature rate-of-rise exceedes default minimum target value, continue to detect exhaust resistance and temperature, when the temperature of DPF downstream exhaust gas reaches default higher limit, or exhaust resistance is less than after default regeneration desired value, stops immediately the oil spout of regenerating.
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