CN105587379B - A kind of dpf regeneration device and method - Google Patents

Abstract

A kind of dpf regeneration device, it is characterized by comprising fuel injectors and controller, it is arranged in the treatment of diesel exhaust system for including at least one particulate filter (DPF), the fuel injector is the electric pulse formula injection unit for pumping end control, by the linear motor-driven pump of electromagnetic drive, high-pressure delivery pipe and nozzle composition, the nozzle is the self-opening poppet valve arrangements opened by pressure, cracking pressure is not less than 0.8MPa, it is mounted in the upstream exhaust pipe of the filter, the controller controls the injection unit work by the driving electric signal of impulse modulation (PWM), so that the electrodynamic pump is generated pulse fuel oil high-pressure and opens the nozzle by the pressure, good fuel spray is formed to be sprayed onto exhaust pipe.Purpose is to be to provide that a kind of jet atomization performance is good, control precision is high, structure is simple, reliable operation, strong applicability engine particulate matter filter regeneration, effectively to realize the control to engine particulate matter discharge and HC discharge.

Description

A kind of dpf regeneration device and method

Technical field

The invention belongs to engine exhaust post-processing technology fields, and in particular to diesel engine and direct spray petrol engine in cylinder Exhaust particulate filter collector (DPF) fuel oil jet regeneration system and its control technology.

Background technique

Diesel engine becomes the most important motive power in the world today with its high thermal efficiency and low carbon dioxide emission amount Device is widely used in road and off roader, engineering machinery, fixed power-equipment etc..In-cylinder direct-jet supercharging gasoline engine Because the thermal efficiency higher than traditional gasoline engine and specific power, more more and more universal in vehicular engine.However, diesel engine and cylinder The multiple pollutant matter that can seriously pollute atmospheric environment harm biology health, including nitrogen are supervened in interior directly jetting gasoline engine burning Oxide (NOx), particulate matter (PM), hydrocarbon (HC) and carbon monoxide (CO) etc..Increasingly with human environment problem Prominent, many countries, which have made laws, limits the discharge amount for polluting surrounding material of various power device products, particularly with vehicle, The emission limit of engineering machinery, generating equipment etc. constantly adds sternly.

The known main means for solving the problems, such as diesel engine emissions be using diesel exhaust aftertreatment technology, including Various catalysts and trap, such as diesel exhaust oxidation catalysis (DOC=Diesel are set in gas exhaust piping Oxidizing Catalyst) device, particulate matter (POC=Particulate Matter Oxidizing Catalyst) Device, selective catalytic reduction (SCR=Selective Catalyst Reduction) device, lean burn exhaust NOx trap (LNT =Lean NOx Trapping) device, diesel particulate filter (DPF=Diesel Particulate Filter), etc. Deng.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 auxiliary system, and SCR needs Reducing agent is quantitatively provided, such as quantitative injection diesel exhaust gas fluid (DEF=Diesel Exaust Fluid) into exhaust pipe is i.e. 32.5% aqueous solution of urea (adding blue liquid=AddBlue)；And LNT and DPF need to be spaced regeneration, i.e., the NOx that ought trap or When particulate matter reaches saturation or license maximum value fastly, need to take special measure contamination-freely remove the NOx trapped or Person's particulate matter.Otherwise, SCR would not have any reduction to NOx, and LNT also can not just reduce NOx after NOx attracts deposit saturation Discharge, the particulate matter blocking that DPF is become trapped in will lead to engine exhaust back pressure raising, make engine performance deterioration.Therefore, this A little auxiliary systems are necessary and crucial.

The regeneration techniques of engine machine particulate matter filter traps DPF can be divided into passive type regeneration and active from regeneration Formula regeneration.Passive type regeneration is that the exhaust conditions formed using the high-speed high-load operating condition of engine that may be present make to trap Burning particulate matter, but because user using the mode of engine be it is uncertain, the institute DPF that can not exclude in this way is stifled Failure is filled in, especially for vehicle diesel engine, the probability that this operating condition occurs is very low, is substantially difficult to effective regeneration DPF.Active regeneration is to generate the temperature for capableing of ignition higher than DPF particulate matter at any time according to the DPF working condition of monitoring Exhaust carries out regenerated specialized system to DPF.The reasonable effective initiative regeneration DPF system of design, is that DPF technology is successfully closed Key.

Active DPF regeneration there are various ways that the main fuel injection system including engine is sprayed after using in the cylinder of strategy again Spray the regeneration that fuel oil improves delivery temperature；In the regeneration of exhaust pipe oil jetting combustion heating exhaust；In exhaust pipe or It is ignited the regeneration etc. of the engine particulate matter trapped in DPF using electric heating or microwave heating.Various regenerations There are respective advantage and disadvantage.The dpf regeneration mode of cylinder injection fuel oil is very high to main fuel injection system requirement, and only high pressure is total The rail and main fuel injection system that can be realized quick multiple-pulse oil spout can be realized, and to main jet oil, there may be one Fixed influence, calibration needs and engine performance calibration carries out together, and calibration cost is higher.In addition in expansion or exhaust stroke Oil spout be easy to because cylinder wall surface is ejected into dilution crankcase engine oil, threat is brought to engine operating reliability.Electricity The regeneration of heating or microwave heating needs to consume a large amount of electric energy, it is necessary to increase the generator power and battery of engine Capacity, in addition there are also problems for reliability or cost.Using additional exhaust pipe fuel-injected regeneration, need to increase by one A fuel injection equipment (FIE).But all in all, exhaust pipe fuel-injected regeneration because its flexibility, extensive adaptability and compared with The advantages that low cost is most adopted methods.

It is mounted on the dpf regeneration mode in exhaust pipe oil spout, needs actively to spray fuel oil into exhaust pipe, in order to improve Efficiency of combustion obtains highest dpf temperature with least fuel consumption and achievees the purpose that the particulate matter for regenerating DPF trapping, injection Fuel must be atomized good and have a higher accuracy of spray.However, prior art majority uses the spraying technique of low pressure.Example Such as, technical solution disclosed in United States Patent (USP) (publication number: US2007/0033927) has borrowed the spray of gasoline port spraying system Basic principle and nozzle arrangements metering fuel oil are penetrated, because this measuring jet can not bear the hot environment of exhaust pipe, The program separately devises the pressure self-opening that may be mounted on an exhaust pipe injection poppet, and metering control is separate Metering control is connected to by exhaust pipe setting by a connecting tube with injection poppet.Because using gasoline air inlet The low pressure equipressure metering system of mouth spraying system, injection pressure is relatively low, and atomization is poor, and system building blocks are more, multiple Miscellaneous and higher cost.

Chinese patent 200680027310.6(Authorization Notice No. CN101265824A) disclose a kind of DPF of lower cost Regeneration fuel oil injection apparatus sprays system with main fuel using the metering regeneration fuel oil injection of switching mode (ON-OFF) solenoid valve control The low pressure oil supply pump of system is provided with the fuel oil of pressure fluctuation, maintains injection pressure mean values certain by a pressure-control valve In range, and nozzle is pressure self-opening, but can only be worked in a manner of trembling because of injection pressure fluctuation, when spraying pressure Low when high, pressure is pulsed within the scope of 1-8bar.This metering method is difficult to obtain high-precision, is equally atomized poor.

It such as the dpf regeneration system of above-mentioned exhaust pipe oil spout, is mounted on exhaust pipe using pressure self-opening nozzle, due to row Tracheae temperature is very high, and nozzle and the fuel delivery line connecting with nozzle need to bear quite high temperature, therefore, for spray Injection pressure is low thus nozzle opening pressure can only set for lower self-opening nozzle, leakproofness is difficult to ensure, is stopping spraying During penetrating, internal trapped fuel is for a long time by high temperature, it is possible to create fuel oil is rotten to form carbon distribution or deposit etc., will affect The normal work of fuel nozzle.Chinese patent 200810007980.2(Authorization Notice No. CN101265824A) disclose a kind of benefit There is the method for pressure air purging nozzle, pipeline with what the compressor of Turbochargers in Diesel Engines exported, but needs peripheral hardware one Compressed air is collected and storage device, system complex are at high cost.Even if using compression on the device for having compressed air source Air realizes this function, such as on the commercial vehicle using pneumatic braking system, this nozzle cleaning system also compared with Complexity, it is at high cost.

In addition, actual diesel engine delivery temperature is generally less than 500 DEG C, the especially bus of city operating condition operation and light-duty Commercial vehicle, device engine exhaust temperature is even substantially always at 250 DEG C hereinafter, therefore can regeneration fuel oil reliable after spraying into exhaust pipe It burns and one must solve the problems, such as, otherwise can not only regenerate DPF, HC discharge can be can increase instead.

Summary of the invention

The present invention in view of the above-mentioned problems, purpose be to be to provide that a kind of jet atomization performance is good, control precision is high, structure Simply, the engine particulate matter filter regeneration of reliable operation, strong applicability arranges engine particulate matter with effectively realizing Put the control with HC discharge.

To achieve the above object, the present invention takes following technical scheme, that is, a kind of dpf regeneration device, it is characterised in that: Including fuel injector and controller, it is arranged in the treatment of diesel exhaust system including at least one particulate filter (DPF) In system, the fuel injector is the electric pulse formula injection unit for pumping end control, by the linear motor-driven pump of electromagnetic drive, high pressure Delivery pipe and nozzle composition, the nozzle is the self-opening poppet valve arrangements opened by pressure, and cracking pressure is not less than 0.8MPa is mounted in the upstream exhaust pipe of the filter, and the controller passes through the driving electric signal of impulse modulation (PWM) The injection unit work is controlled, so that the electrodynamic pump is generated pulse fuel oil high-pressure and opens the spray by the pressure Mouth forms good fuel spray and is sprayed onto exhaust pipe.

The electric pulse formula injection unit of dpf regeneration device of the present invention, the control of pump end can be generated higher than 1MPa's The cracking pressure of pulse, nozzle is not less than 0.8MPa, therefore sealed nozzle is good, can guarantee on the exhaust pipe of engine It installs and reliably working, avoids nozzle carbon distribution failure because of exhaust high temperature.Because it is high to spray pressure, fuel oil jet atomization is good It is good, and can accurately control fuel injection amount and (utilize various known control theories and method, such as Chinese patent 200610079743.8), so being easily formed combustion mixture, trouble-free burning makes exhaust-gas temperature rising, regenerates DPF.Spraying system is complete Portion's electric drive, linear motor-driven pump do not need forced feed, therefore flexible arrangement is convenient on vehicle or engine, adaptable, And system is constituted simply, advantageously reduces cost.These be all the present invention can bring benefit, enable goal of the invention reality It is existing.

Following technical solution has done further improvement or limitation to the present invention.

Technical solution of the present invention, including a diesel exhaust gas oxidation catalyzer (DOC) are arranged in the nozzle and institute It states between filter, the nozzle, which sprays after the fuel spray to be formed forms gaseous mixture in exhaust pipe, initially enters the diesel oil Vent Oxidation catalyst converter, burning rises delivery temperature wherein, and high-temperature exhaust air enters the filter.

DOC can substantially facilitate flow through the oxidizing fire reaction in the exhaust on its surface because of the effect of its catalytic specie, It generally being capable of ignition at 240 DEG C or so.Therefore, even if the gaseous mixture spontaneous combustion temperature under no catalytic condition is not achieved in delivery temperature Degree, nozzle of the present invention sprays the fuel spray to be formed can also start to burn after entering DOC, and delivery temperature is made to rise to energy The temperature (general to require at 500 DEG C or more) of enough igniting particles objects, high-temperature exhaust air can start to burn after entering the filter Fall the particulate matter wherein trapped, that is, starts to regenerate.

The electric pulse formula injection unit of pump end of the present invention control, using a high-pressure delivery pipe by nozzle and electronic Pump separation, electrodynamic pump can be set in the position far from exhaust pipe, to not influenced by exhaust pipe hot environment, reliable work Make.High-pressure delivery pipe must satisfy certain requirement, such as internal diameter, between 0.5-3mm, the volume acted on by internal pressure is swollen For bulk less than 3%, length is not more than 2000mm.High-pressure delivery pipe can be made of metal material or high molecular material.

Dpf regeneration device of the present invention may also include an igniter, for example including one by the controller control The ignition spark plug or glow plug of system.Spark plug or glow plug are located at fuel injector along the downstream of spray direction, so that The bloom of spark plug or the high temperature position of glow plug can be reached in spraying or spraying generated fuel-steam.Therefore Even if the nozzle, which sprays the fuel spray gaseous mixture to be formed, can not reach spontaneous combustion, device can be ignited by, which remaining on, is lighted, and is guaranteed The validity of dpf regeneration (especially row's temperature is compared with the regeneration under low state).

In order to keep igniting more reliable, the present invention can also include a conducting element, change its point by conducting element by spraying Cloth and direction make more by spraying or at spraying generated fuel-steam arrival spark plug or glow plug.This burning Mode is similar to the combustion system of in-cylinder direct-jet spark ignition engine.

Dpf regeneration device of the present invention, may also include that one or more exhaust gas temperature sensor, be mounted on described Each position for the treatment of of diesel exhaust system, upstream or the diesel exhaust gas oxidation catalysis including the fuel nozzle The downstream of the upstream and the filter of the upstream of device or the filter；One exhaust back pressure sensor or one Differential pressure pickup, the exhaust back pressure sensor are mounted in the upstream exhaust pipe of the filter, the differential pressure pickup with The inlet and outlet of the filter is connected to, exhaust resistance when measuring engine operation；One lambda sensor is mounted on described The upstream of the fuel nozzle perhaps downstream of the DOC or the downstream of the DPF, the oxygen concentration in measurement exhaust.

There is a sensor, the controller can judge that present engine is vented status, including everywhere Pressure difference, exhaust gas oxygen etc., determine whether to can star dpf regeneration program before and after delivery temperature, exhaust back pressure, DPF, then Whether detection regeneration is normal during raw, if effectively, if that the particulate matter trapped is completely burned off.

The invention also includes the methods for using above-mentioned each technical solution, it may be assumed that a method of regeneration DPF, including following step It is rapid: the master control ECU(electronic control unit of described control unit and diesel engine) it is communicated, it obtains engine speed, bear The engine operation conditions parameter such as lotus, extraction flow, air-fuel ratio；Control unit detects row when delivery temperature and engine operation Atmidometer；Accumulated running time after calculating last time dpf regeneration predicts the particulate matter quality of DPF trapping；If prediction Exhaust resistance when particulate matter quality has been more than a preset threshold value or engine operation has repeatedly been more than certain threshold Value is then ready to starting reproducer；When engine is in operating status and delivery temperature be greater than it is preset it is minimum can be again Raw temperature and when density of oxygen contained in discharged gas is in default range, starts reproducer, issues and spray to electric pulse formula injection unit Fuel oil instruction and firing command are penetrated, and regeneration fuel oil the amount of injection is determined according to engine operation condition parameter at that time.

Within the engine, master control ECU may directly use air fuel ratio signal, so the signal of the lambda sensor generally connects Enter master control ECU.Master control ECU control engine operation, so generally also measure or be calculated engine speed, load, The engine operation conditions such as extraction flow, air-fuel ratio and state parameter, and these data are dealt into CAN bus.The control Unit can obtain these engine operation conditions and state parameter by CAN bus, in conjunction with the exhaust system of oneself measurement Temperature, exhaust resistance everywhere etc. judge whether to need to start dpf regeneration device.

Extraction flow is equal to the summation of air input of engine by air and fuel consumption, can calculate each exhaust according to extraction flow Exhaust flow rate, air speed in device etc..In the electric pulse formula injection unit to the row of exhaust pipe jet regeneration fuel spray Gas section, exhaust flow rate is excessive to be possible to keep ignition difficult.In DOC, air speed is excessive, may just be difficult to make catalysis oxidation Reaction carries out completely, and as a result wanting to improve by the burning of dpf regeneration fuel oil may be difficult into the target of the filter Reach.Therefore, the threshold limit value for needing to set some parameters in advance, is not achieved these threshold values, is just started without dpf regeneration dress It sets, increases HC discharge to prevent from spraying regeneration fuel oil.These parameter thresholds include: minimum renewable DPF delivery temperature threshold value, Need regenerated exhaust resistance minimum threshold, the particulate matter quality minimum threshold for needing regenerated DPF trapping etc..Exhaust resistance can With the pressure difference between the porting of the exhaust back pressure or DPF filter that are defined as under the conditions of certain extraction flow.DPF is caught The particulate matter quality of collection can be estimated by a prediction model, for example, with engine on time or operating circle number or Accumulative engine fuel consumption quantity is parameter, is calculated with the functional relation of certain monotone increasing, such as proportional relation.When regenerating Afterwards, on the basis of the minimum exhaust resistance obtained after regenerating, a prediction model initial value is determined.The pass of the initial value and exhaust resistance System can demarcate in advance.

Because back pressure or DPF filter intake and exhaust pressure difference in exhaust pipe are transmitted and extraction flow due to pressure wave Change and is constantly in variation, so the calculating of exhaust resistance will consider the average value and peak value of exhaust back pressure, and will be with Extraction flow is related.

It is further comprising the steps of the invention also includes the method for using above-mentioned each technical solution: after reproducer starting, such as Fruit detects that engine operation stops, then stops regeneration, and the particulate matter of the variation amendment DPF trapping according to exhaust resistance immediately Quality；If engine remains operational after reproducer starting, then regeneration fuel oil injection and electrical fire are kept, filter is detected The temperature change of upstream and downstream exhaust gas；If temperature rate-of-rise is not above preset minimum target value, keep most After the short reproduction time, it is determined as that regenerative combustion fails, stops regeneration, and issue failure signal；In regenerative process, if warm Spending climbing speed is more than preset minimum target value, then continues to test exhaust resistance and temperature change, when the temperature of downstream of DPF exhaust Degree reaches preset upper limit value or exhaust resistance less than after preset regeneration target value, stops regeneration oil spout and igniting immediately.

Dpf regeneration will generally continue 5~20 minutes once starting, should if engine stop operating during this Stop regeneration oil spout immediately, otherwise spraying fuel oil often becomes HC discharge, because will not have in engine stop heel row tracheae New air supply.If after dpf regeneration starting, it is found that the delivery temperature rising of downstream of DPF is not achieved within a certain period of time and wanting It asks, i.e., climbing speed is not above preset minimum target value (threshold value), it can be concluded that regeneration oil spout does not have active combustion, It may be that will stop immediately after regeneration fuel injection duration shortest a period of time since some failure of system causes, and control Device issues a dpf regeneration system failure to CAN bus simultaneously.If not stopping spraying dpf regeneration fuel oil, spray in this case Fuel oil often becomes HC discharge out.

After regeneration, the delivery temperature climbing speed of downstream of DPF has been more than preset minimum target value (threshold value), then protecting Hold regeneration oil spout, once exhaust resistance drop to regeneration targets threshold hereinafter, if illustrate reproductive success complete, can stop regeneration spray Oil.If during regeneration, the delivery temperature of downstream of DPF has risen to the threshold value of protection DPF or more, then also stopping regeneration immediately Oil spout, even if being also possible to not reach exhaust resistance drops to regeneration targets threshold or less.Protect the exhaust temperature of the downstream of DPF of DPF Spend threshold value, it should the maximum allowable temperature less than DPF.After stopping regenerating oil spout because of protection DPF, actual DPF may It also will continue to keep regeneration, exhaust resistance can also further decline.

The invention will be described in further detail with reference to the accompanying drawings and detailed description.

Detailed description of the invention

Fig. 1 is the example structure schematic diagram of DPF component regenerating unit provided by the invention.

Fig. 2 is the fuel injector structural schematic diagram 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 the nozzle and spark plug arrangement schematic diagram of dpf regeneration device provided by the invention.

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 includes fuel injector 1, filter 2, Controller 3, spark plug 4, exhaust pipe 8, auxiliary fuel tank 9, flow deflector 13, temperature sensor 12 and 12a, differential pressure pickup 11, one Lambda sensor 10.

The fuel injector 1 is an electric pulse formula injection unit by the control of pump end, exports PWM by controller 3 Electrical driving pulses control.The fuel injector 1 includes solenoid pump device (linear motor-driven pump) 5, nozzle 6 and high-pressure delivery Pipe 7, concrete structure schematic diagram is as shown in Figure 2.In the given pump installation structure chart of Fig. 2, the solenoid pump device 5 includes helical Tube drive device 101, plunger assembly 102, return spring 111 pump end 103, export end housing 134 and strainer 121.

Solenoid driving device 101 includes coil 137, inner yoke 119, external magnetic yoke 118, magnetic gap 117 and armature 113. Inner yoke 119, outer yoke 118 and armature 113 are made of permeability magnetic material, and magnetic gap 117 is non-magnet material.Armature 113 is substantially One cylindrical body, the through-hole 114 including penetrating through both ends of the surface.The through-hole 114 can have certain taper, the hole with taper to Feeding liquid under pressure Directional Extension, to realize liquid in the directed flow of inner space, to cool down solenoid driving device 101 and improve The stability of its work.

Plunger assembly 102 includes sleeve 132, plunger 133, liquid feed valve 123 and liquid valve 129.Sleeve 132 is coaxially fixed on It exports in end housing 134, sleeve 132 is equipped with lateral overflow hole 123a and is connected to axial plunger hole 131, circumferentially periphery It is axially arranged with liquid return hole 120.133 snug sliding fit of plunger forms force feed volume 131a, upper part in sleeve 132 It is contacted always by connector 112 with armature 113, armature 113 and plunger 133 are also possible to an entirety.Overflow hole 123a with Plunger end face 133a forms feed liquor slide valve 123.Liquid valve 129 is by liquid valve part 124, liquid valve spring 125 and 130 groups of liquid valve seat At liquid valve seat 130 is the conical surface cooperated with liquid valve part 124, is located at 132 end of sleeve.The setting of return spring 111 exists Between plunger 133 and the bottom armature space 113a, spring force is reversed with driving force, and armature 113 and plunger 133 is driven back and forth to be transported It is dynamic, so that force feed volume size checker, forms working cycles.

Pump end 103 includes back fluid passage 116 and pump end end face 103a.The pump end end face 103a is for limiting armature return row Journey is pumped and is sealed between end 103 and inner yoke 119 by sealing ring 115, and held tightly by outer yoke 118.

Output end housing 134 includes tapping channel 126 and the female 134a that can be docked with quick coupling.

Anti-coking and the strong promotion valve type structure of pollution capacity can be selected in nozzle 6, and structural schematic diagram is as shown in figure 3, packet Include a nozzle filter core 144, a valve seat 142, a valve member 140, a valve spring 139 and valve body 143.It is wrapped outside valve body 143 Containing a connection screw thread 138 and an erecting bed 141.

The high-pressure delivery pipe 7 can be a kind of easily deformable flexible pipe, be also possible to a kind of on-deformable rigidity Pipe.Flexible pipe can be tubing made of the metal tube or heat resistance high molecular material of thin-walled, can also be metal with it is nonmetallic Multiple tube.7 both ends of high-pressure delivery pipe separately include one and export what end housing quick coupling 134a was docked with fuel injector 1 Quick-joint male head 127, a hickey 136 being connect with nozzle connection screw thread 138.Fuel injector 1 and high-pressure delivery pipe 7 are logical It crosses 128 sealing of o circle, nozzle 6 and high-pressure delivery pipe 7 and passes through 135 sealing of o circle.

The fuel injector 1 can generate the impulse jet pressure higher than 1MPa, and wherein 6 cracking pressure of nozzle is greater than 0.8MPa, thus sealing is easily guaranteed that anti-coking and pollution capacity are strong.

The course of work of fuel injector 1 is as follows.

In movement initial position, since the acting ram 133 and armature 113 of return spring 111 are located at stroke beginning, at this time Liquid feed valve 123 is in the open state, and overflow hole 123a is connected to force feed volume 131a, is passed through by the fuel oil that liquid inlet channel 122 enters Overflow hole 123a enters force feed volume 131a, full of wherein.When armature 113 is by electromagnetism power drive downlink, while passing through connector 112 push plunger 133, and force feed volume 131a constantly reduces, once overflow hole 123a is blocked by the wall surface 133a of plunger 133, into Liquid valve 123 is closed, and force feed stroke starts, and fluid pressure increases in force feed volume 131a, and then opens liquid valve 129, works as effect When the pressure of liquid valve part 124 can overcome the active force of liquid one-way valve spring 125 out, liquid check valve 129 is opened out, liquid Into tapping channel 126.After the electromagnetic force acted on armature 113 disappears, armature 113 is opened under the action of return spring 111 Beginning return-stroke is closed because the expansion of force feed volume 131a causes pressure decline then to go out liquid check valve 129, liquid feed valve at this time 123 open, and liquid quickly enters force feed volume 131a under the action of pressure difference, when the continuation return of armature 113 is by pump end bottom surface 103a stops and terminates, this circulation terminates.

In the process, the fuel oil entered by liquid inlet channel 122 together with bubble therein, can by liquid return hole 120 into Enter low pressure volume 131a, from return fluid passage 116 be discharged, while magnetic coil 137 work generate heat can by return liquid stream eliminate or It reduces.

In above-mentioned example, the controller 3 can be one for receiving master controller working signal and controlling fuel oil spray The metering module that emitter 1 works, is also possible to the aftertreatment controller of an independent control DPF system.Pacify on the exhaust pipe 8 It can connect an oxidized form catalyst DOC14 before equipped with diesel particulate filter (DPF) 2, DPF, or filtered in DPF Direct noble metal-coating catalyst on device.Spark plug 4 is installed on after nozzle 6, is located at the upstream DPF2, when nozzle 6 sprays by spraying When spark plug 4 light a fire in due course, it is spraying to light regeneration fuel oil, to improve delivery temperature, into DPF 2, to receive in the DPF 2 that ignites The particulate matter as the main component with soot collected achievees the effect that preferably to regenerate DPF.It is sprayed into this system from nozzle 6 Fuel oil should lack as far as possible, but engine exhaust must be made to reach sufficiently high temperature, therefore it is required that fuel-oil atmozation is good, distribution Rationally, burning is abundant.Thus, the present invention selects anti-coking and the strong promotion valve type structure nozzle 6 of pollution capacity.6 upstream of nozzle The flow deflector 13 for encircling nozzle comprising one and half, the view along discharge directions also may include flat with exhaust stream 19 as shown in 13a Capable some through-holes.Change spray direction by the higher flow deflector 13 of temperature and generates fuel-steam, meanwhile, flow deflector 13 There is choked flow effect, keep exhaust stream 19 relatively stable in region downstream, fuel-steam that is spraying or generating by spraying can be to have The form of effect reaches the region of discharge of spark plug 4, and forms stable burned flame.

A kind of circumference of nozzle 6, spark plug 4 and flow deflector 13 is to installation example, as shown in Figure 4.In the embodiment, lead The sheet body of flow 13 is identical as 19 directions of exhaust, and spark plug 4 can be installed on the same circumference being closer to nozzle 6, can also be with Positioned at 6 downstream of nozzle at 6 position of nozzle.

Due to the presence of igniter, regeneration fuel oil is sprayed at such as 100-250 DEG C of relatively low delivery temperature of condition Under may also trouble-free burning so that DPF is obtained reliable regeneration further by DOC completely burned.Therefore present invention is particularly suitable for In the emission reduction with diesel engine.

An auxiliary fuel tank 9 is equipped in Fig. 1 embodiment, so that fuel oil energy in auxiliary fuel tank 9 on fuel injector 1 Enough entered in fuel injector 1 by gravity and forms normal fuel feeding.The oil return of engine high pressure spraying system (preferably takes string The form of connection) auxiliary fuel tank 9 entered by oil inlet 15a, the main fuel tank of engine is then returned to by oil return opening 16a again.Secondary oil The fuel oil of case 9 can also arise directly from engine high pressure spraying system low pressure oil supply pump, or pass through complementary pump (such as vacuum Pump) or the effect of gravity take oil from engine main fuel tank.It is at least wanted from engine main fuel tank to liquid fuel injector 1 It arranges one of filtration system, if the low pressure oil return from engine high pressure spraying system, can not need separately to add filter, it is no A fuel oil filter 121 can be then arranged again.The fuel tank 9 is including one and combustion system of diesel engine oil return line (in figure Be not shown) connection in-line 15 and an oil return line 16 being connect with main fuel tank (not shown).Fuel injector 1 into Hydraulic fluid port 122 is imported from auxiliary fuel tank 9 and through the filtered fuel oil of filter 121, under the control of controller 3 by oil inlet pipe 17 Then pump oil is injected into the exhaust pipe of engine 8 from nozzle 6 to injection pipe 7, the metered injection oil mass simultaneously of controller 3, according to being examined Engine operating condition, DPF pressure drag, exhaust condition and dpf temperature (not shown) for measuring etc. judge that sprayed oil mass is It is no suitable, and whether need to continue.The oil return of fuel injector 1 returns to the upper space of fuel tank 9 by oil return pipe 18.It is secondary The liquid outlet 18a of fuel tank 9 is located at bottom, and liquid return hole 17a is located at higher position, so that fuel tank 9 is in the case where oil reserve is few It remains to work normally.

The course of work of the DPF system of the embodiment of the present invention is as follows.

Soot from engine is filtered and gradually accumulated wherein by DPF2, with the increase of soot accumulation amount, DPF2 The pressure difference △ P of front and back is incrementally increased, when controller 3 by differential pressure pickup 11 detect △ P be greater than particular value when (or Will influence the power output of engine) or when controller reaches certain threshold value according to the trapping amount of soot of model prediction, If other conditions also meet regeneration DPF condition, controller 3 drives fuel injector 1 to pass through nozzle 6 to the exhaust pipe of engine Fuel oil is sprayed in 8, while the control of controller 3 driving spark plug 4 igniting is to increase row's temperature.The exhaust of 12 real-time capture of temperature sensor Temperature, when temperature is higher than certain value, spark plug 4 stops working, in order to avoid overheated filter scaling loss.Differential pressure pickup 11 continues to examine The pressure difference △ P before and after DPF2 is surveyed, when △ P is less than a certain particular value, it is believed that regeneration is completed, and regeneration oil spout and igniting are stopped.Spray The amount of penetrating can be set in advance in the memory of controller 3, can also be carried out according to sensor signals such as temperature and lambda sensors Feedback control.

The method of the regeneration DPF of the embodiment of the present invention includes: after starting dpf regeneration program every time, and controller is fired in control After oil ejector generates by spraying, controlling the igniter and generate pilot spark at least once, igniting sprays synchronously control with fuel oil, Primary injection can repeatedly be lighted a fire, and regeneration fuel oil is not sprayed after reproducer, does not also generate pilot spark.

It is illustrated in figure 5 the controller control logic block diagram citing of the regeneration DPF of the embodiment of the present invention.Detection is started first Machine operating condition parameter, step 202；If engine is being run, when the engine after calculating last time dpf regeneration adds up operation Between, the particulate matter quality of prediction DPF trapping, step 203；If the particulate matter quality of prediction has been more than a preset threshold value, Step 206, exhaust resistance when or engine is run repeatedly has been more than certain threshold value, step 205, then is ready to start Reproducer；When engine is in operating status and engine operation condition meets regeneration DPF condition (such as air speed is specific Within range) and delivery temperature be greater than preset minimum renewable temperature, step 207 and density of oxygen contained in discharged gas is preset When in range, step 208, start reproducer, issues the instruction of injection fuel oil and firing command, step to fuel injector 209。

Further, after reproducer starting, if detecting that engine operation stops, stopping regeneration, such as step immediately 216, and the particulate matter quality of the variation amendment DPF trapping according to exhaust resistance；If engine is kept after reproducer starting Operation then keeps regeneration fuel oil injection and electrical fire, detects the upstream of filter and the temperature change of downstream exhaust gas, such as step 212；It is determined as again after being kept for the shortest reproduction time if temperature rate-of-rise is not above preset minimum target value Raw burning failure, stops regeneration, such as step 216, and issues failure signal；In regenerative process, if temperature rate-of-rise is super Preset minimum target value is crossed, then continues to test exhaust resistance and temperature, such as step 213 and 214, when the temperature of downstream exhaust gas reaches After being less than preset regeneration target value to preset upper limit value or exhaust resistance, stop regeneration oil spout, such as step 216 immediately.

In the above method, controller can be communicated with the master control ECU of diesel engine, with obtain engine speed, The engine operation conditions parameter such as load, extraction flow, air-fuel ratio, according to the engine operation process after last time dpf regeneration, compared with The accurately particulate matter quality that prediction DPF is trapped again, more accurately to judge dpf regeneration condition and state.Certainly, it controls Device can also be exported by the crankshaft footmark signal or tach signal or engine for acquiring engine ac signal come Judge that engine is to operate or stopping, but be merely able to judge dpf regeneration condition rougherly.

Above-mentioned example is merely illustrative the present invention, but is not intended to limit the present invention, it is all based on spirit of the invention into The change scheme of one step belongs to the range that the present invention is disclosed and protected.

Claims (10)

1. a kind of dpf regeneration device, it is characterised in that: including fuel injector and controller, setting is including at least one In the treatment of diesel exhaust system of grain object filter (DPF), the fuel injector is the electric pulse formula spray for pumping end control Unit is penetrated, is made of the linear motor-driven pump, high-pressure oil pipe and nozzle of electromagnetic drive, the nozzle is to open certainly by what pressure was opened Formula poppet valve arrangements, cracking pressure are not less than 0.8MPa, are mounted in the upstream exhaust pipe of the filter, and the controller is logical The driving electric signal that extra pulse modulates (PWM) controls the injection unit work, and the electrodynamic pump is made to generate pulse fuel oil high pressure Pressure simultaneously opens the nozzle by the pressure, forms good fuel spray and is sprayed onto exhaust pipe；

The linear motor-driven pump includes solenoid driving device, and plunger assembly, return spring, pump end exports end housing and filter Net；Solenoid driving device includes coil, inner yoke, outer yoke, magnetic gap and armature, and inner yoke, outer yoke and armature are by magnetic conduction Material is made, and magnetic gap is non-magnet material, an armature substantially cylindrical body, the through-hole including penetrating through both ends of the surface, the through-hole With certain taper, the hole with taper is to feeding liquid under pressure Directional Extension, to realize liquid in the directed flow of inner space；Column Plug assembly includes sleeve, plunger, liquid feed valve and liquid valve, and sleeve is coaxially fixed in output end housing, and sleeve is equipped with lateral Overflow hole be connected to axial plunger hole, circumferentially periphery is axially arranged with liquid return hole, and plunger snug sliding fit is mounted in sleeve It is interior, and force feed volume is formed, upper part is contacted by connector with armature always, and overflow hole and plunger end face form feed liquor and slide Valve, liquid valve are made of liquid valve part, liquid valve spring and liquid valve seat, and liquid valve seat is the cone of one with the cooperation of liquid valve part Face is located at barrel end, and return spring is arranged between plunger and armature space bottom, and spring force is reversed with driving force, drives Armature and piston reciprocation move, so that force feed volume size checker, forms working cycles；Pump end includes back fluid passage and pump end End face, the pump end end face pump and are sealed between end and inner yoke by sealing ring, and by outer magnetic for limiting armature return-stroke Yoke is held tightly；Export the female that end housing includes tapping channel and can dock with quick coupling.

2. dpf regeneration device as described in claim 1, it is characterised in that: including a diesel exhaust gas oxidation catalyzer (DOC), it is arranged between the nozzle and the filter, the nozzle sprays the fuel spray to be formed and formed in exhaust pipe The diesel exhaust gas oxidation catalyzer is initially entered after gaseous mixture, burning rises delivery temperature wherein, and high-temperature exhaust air enters The filter.

3. dpf regeneration device as claimed in claim 1 or 2, it is characterised in that: including an ignition spark plug, by the control Device processed control generates pilot spark, and the spark plug is located at the downstream that the nozzle sprays spray direction so that be sprayed or Fuel-steam caused by spraying can reach at spark plug gap.

4. dpf regeneration device as claimed in claim 1 or 2, it is characterised in that: including an igniting glow plug, by the control Device control glow plug processed is powered, and the glow plug is located at the downstream that the nozzle sprays spray direction, so that spraying or spray Fuel-steam caused by mist can reach at glow plug.

5. dpf regeneration device as claimed in claim 2, it is characterised in that: including one or more exhaust gas temperature sensor, It is mounted on each position of the treatment of diesel exhaust system, upstream or diesel exhaust gas oxidation including the nozzle are urged Change the upstream of device or the upstream of the filter and the downstream of the filter.

6. dpf regeneration device as claimed in claim 5, it is characterised in that: including an exhaust back pressure sensor or one Differential pressure pickup, the exhaust back pressure sensor are mounted in the upstream exhaust pipe of the filter, the differential pressure pickup with The inlet and outlet of the filter is connected to, exhaust resistance when measuring engine operation.

7. dpf regeneration device as claimed in claim 6, which is characterized in that including a lambda sensor, be mounted on the nozzle The upstream perhaps downstream of the diesel exhaust gas oxidation catalyzer or the downstream of the DPF, the oxygen concentration in measurement exhaust.

8. dpf regeneration device as claimed in claim 1 or 2, which is characterized in that including a conducting element, pass through water conservancy diversion by spraying Part changes its distribution and direction, and more spraying or spraying generated fuel-steam is made to reach spark plug or glow plug Place.

9. a kind of method for carrying out regeneration DPF using dpf regeneration device as described in claim 1, comprising the following steps: control Unit is communicated with the master control ECU of diesel engine, obtains the engines such as engine speed, load, extraction flow, air-fuel ratio Operating condition parameter；Control unit detects exhaust resistance when delivery temperature and engine operation；After calculating last time dpf regeneration Accumulated running time predicts the particulate matter quality of DPF trapping；If the particulate matter quality of prediction has been more than one preset Exhaust resistance when threshold value or engine are run repeatedly has been more than certain threshold value, then is ready to starting reproducer；When Engine is in operating status and delivery temperature is greater than preset minimum renewable temperature and density of oxygen contained in discharged gas preset When in range, start reproducer, issues the instruction of injection fuel oil and firing command, and root to electric pulse formula injection unit Regeneration fuel oil the amount of injection is determined according to engine operation condition parameter at that time；The course of work of fuel injector is as follows: moving Initial position, since the acting ram and armature of return spring are located at stroke beginning, liquid feed valve is in the open state at this time, overflow Hole is connected to force feed volume, enters force feed volume by overflow hole by the fuel oil that liquid inlet channel enters, full of wherein；When armature is by electricity Magnetic drive downlink, while plunger is pushed by connector, force feed volume constantly reduces, once overflow hole is hidden by the wall surface of plunger Gear, liquid feed valve are closed, and force feed stroke starts, and fluid pressure increases in force feed volume, and then open liquid valve, when acting on out liquid When the pressure of valve member can overcome the active force of liquid one-way valve spring out, liquid check valve is opened out, and liquid enters tapping channel；As After being disappeared with the electromagnetic force on armature, armature starts return-stroke under the action of the return spring, at this time because of force feed volume Expansion causes pressure decline then to go out liquid closed check valve, and liquid feed valve is opened, and liquid quickly enters force feed under the action of pressure difference Volume, when the continuation return of armature is stopped by pump end bottom surface and terminates, this circulation terminates；In the process, pass through liquid inlet channel The fuel oil of entrance can enter low pressure volume by liquid return hole together with bubble therein, be discharged from fluid passage is returned, while magnetic coil work Making the heat generated can eliminate or reduce by returning liquid stream.

10. the method for regeneration DPF as claimed in claim 9, further comprising the steps of: after reproducer starting, if detected Engine operation stops, then stops regeneration, and the particulate matter quality of the variation amendment DPF trapping according to exhaust resistance immediately；Such as Fruit reproducer starting after, engine remains operational, then keep regeneration fuel oil spray and igniting, detect filter upstream and The temperature change of downstream exhaust gas；If temperature rate-of-rise is not above preset minimum target value, shortest regeneration is kept After time, it is determined as that regenerative combustion fails, stops regeneration, and issue failure signal；In regenerative process, if raising speed in temperature Rate is more than preset minimum target value, then continues to test exhaust resistance and temperature, when the temperature of downstream of DPF exhaust reaches preset After upper limit value or exhaust resistance are less than preset regeneration target value, stop regeneration oil spout immediately.