CN104395570A

CN104395570A - Exhaust purification system of internal combustion engine

Info

Publication number: CN104395570A
Application number: CN201380031939.8A
Authority: CN
Inventors: 大道重树; 袋田圣; 大山尚久; 仙田幸二; 大河原诚治
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2012-09-05
Filing date: 2013-09-05
Publication date: 2015-03-04
Also published as: BR112014031552A2; JP2014051896A; EP2850293A1; US20150204224A1; RU2014151055A; WO2014038724A1; JP5798533B2; IN2014DN10689A

Abstract

A particulate filter (24) for trapping particulate filter which is contained in exhaust gas is arranged in an engine exhaust passage. The particulate filter is provided with exhaust gas inflow passages and exhaust gas outflow passages which are alternately arranged via porous partition walls. Movement promoting control is performed to promote movement of the ash which deposits on the inner circumferences of the exhaust gas inflow passages to the rear parts of the exhaust gas inflow passages. The pressure loss of the particulate filter is detected. When the detected pressure loss is larger than a predetermined upper limit value, PM removal control is performed to remove the particulate matter from the particulate filter.

Description

The emission control system of explosive motor

Technical field

The present invention relates to a kind of emission control system of explosive motor.

Background technique

Known a kind of explosive motor in related domain, this explosive motor is configured with the particulate filter for trapping the particulate matter comprised in exhaust in engine exhaust passage.This particulate filter is provided with the exhaust that the next door via porous alternately configures and flows into path and exhaust outflow pathway.As a result, first exhaust flows into exhaust and flows in path, is then flowed out in exhaust outflow pathway by next door.Therefore, the particulate matter comprised in exhaust is trapped in next door or forms exhaust and flows into the next door of the inner circumferential of path on the surface.

Deposition along with the particulate matter on particulate filter becomes increasing, and the pressure loss of particulate filter becomes increasing.If the pressure loss of particulate filter becomes increasing, then motor exports and is easy to decline.Therefore, the emission control system of known a kind of explosive motor in related domain, this emission control system detects the pressure loss of particulate filter, and performs PM removal control (see PLT1) removing particulate matter from particulate filter when the pressure loss exceedes CLV ceiling limit value.

Quote inventory

Patent documentation

PLT1: Japanese patent gazette No.2005-76462A

Summary of the invention

Technical problem

In this respect, exhaust comprises the non-combustible composition being called " ashes ".These ashes are trapped by particulate filter together with particulate matter.In this respect, even if perform PM to remove control, ashes also can not burn or gasify.That is ashes are not removed from particulate filter, but be retained on particulate filter.As a result, the pressure loss of particulate filter becomes increasing along with the ashes amount be deposited on particulate filter.Thus, perform PM and remove if exceed CLV ceiling limit value by the pressure loss of particulate filter and control, although the fewer PM that also performs of the deposition of the particulate matter then often on particulate filter removes and controls.That is PM removes the execution controlled and often shifts to an earlier date relative to the best opportunity opportunity.Therefore, PM removes and controls often performed by non-preferentially frequent and often increase for PM removes the energy controlling to consume.

The solution of problem

According to the present invention, provide a kind of emission control system of explosive motor, described emission control system is provided with the particulate filter for trapping the particulate matter comprised in exhaust in engine exhaust passage, described particulate filter is provided with the exhaust that the next door via porous alternately configures and flows into path and exhaust outflow pathway, the feature of described emission control system is that this system comprises: mobile promotion device or mobile promoters, described mobile promotion device or mobile promoters are for promoting that the ashes be deposited in the inner circumferential of described exhaust inflow path move to the described rear portion flowing into path that is vented, detection device or detector, described detection device or detector are for detecting the pressure loss of described particulate filter, with PM removal device or PM remover, described PM removal device or PM remover are used for the PM performed when the detected pressure loss is greater than predetermined CLV ceiling limit value for removing particulate matter from described particulate filter and remove control.

Preferably, whether the described mobile amount promoting that device differentiation has been deposited on the described ashes be vented in the inner circumferential flowing into path is greater than predetermined upper limit amount and performs mobile promotion control when the amount being determined as described ashes is greater than described predetermined upper limit amount.

Preferably, described mobile promotion device, to described particulate filter feed fluid, controls to perform described mobile promotion.More preferably, described liquid is made up of at least one in water, the aqueous solution and liquid fuel.More preferably, engine charge path, the engine exhaust passage being arranged in described particulate filter upstream and at least one of exhaust gas recirculatioon path described engine charge path and engine exhaust passage are connected to each other are formed with water of condensation reservoir, described water of condensation reservoir is stored in the water of condensation that described explosive motor produces, and described mobile promotion device supplies the water of condensation be stored in described water of condensation reservoir to described particulate filter, control to perform described mobile promotion.More preferably, described system also comprises: NOx reducing catalyst, and described NOx reducing catalyst is configured in described particulate filter or is configured in the engine exhaust passage being arranged in described particulate filter downstream; Reducing agent adds valve, and described reducing agent adds valve and liquid reducer secondary added to the engine exhaust passage being arranged in described particulate filter upstream; With NOx reduction device or NOx reductor, described NOx reduction device or NOx reductor are used for for the NOx reduction interpolation pressure of reducing NOx and NOx reduction interpolation time from described reducing agent interpolation valve adding liquid reducing agent, and described mobile promotion device is to add the low interpolation pressure of pressure or to add valve adding liquid reducing agent with the interpolation time longer than the described NOx reduction interpolation time from described reducing agent than described NOx reduction, control to perform described mobile promotion.

Preferably, the described mobile pressure pulsation that device makes described particulate filter inside that promotes, controls to perform described mobile promotion.

Preferably, described mobile promotion device makes described particulate filter vibrate, and controls to perform described mobile promotion.

Preferably, described mobile promotion device makes the temperature of described particulate filter rise to the temperature higher than temperature during PM removal control, promotes control to perform described movement.

Preferably, described mobile promotion device feeds liquid to described particulate filter and described liquid is solidified, and controls to perform described mobile promotion.

Advantageous effects of the present invention

PM removes control and can perform in the best opportunity.

Accompanying drawing explanation

Fig. 1 is the overall pattern of explosive motor.

Fig. 2 is the schematic diagram of cooling unit.

Fig. 3 A is the front view of particulate filter.

Fig. 3 B is the side view cutaway drawing of particulate filter.

Fig. 4 illustrates that PM removes the time diagram controlled.

Fig. 5 A is the arteries and veins spectrogram that increase is shown.

Fig. 5 B is the arteries and veins spectrogram that reduction is shown.

Fig. 6 illustrates the flow chart removing the program controlled for performing PM.

Fig. 7 is the flow chart of the program illustrated for count particles electrodeposition substance amount QPM.

Fig. 8 A is the plotted curve of the relation illustrated between pressure difference PD and particulate matter deposition QPM.

Fig. 8 B is the plotted curve of the relation illustrated between pressure difference PD and particulate matter deposition QPM.

Fig. 8 C is the plotted curve of the relation illustrated between pressure difference PD and particulate matter deposition QPM.

Fig. 8 D is the plotted curve of the relation illustrated between pressure difference PD and particulate matter deposition QPM.

Fig. 9 A be illustrate be deposited on exhaust flow into ashes in the inner circumferential of path, the sectional view of the partial enlargement of particulate filter.

Fig. 9 B illustrates to be deposited on the sectional view that exhaust flows into the partial enlargement of the ashes at the rear portion of path.

Figure 10 illustrates the mobile time diagram promoting to control.

Figure 11 A is the plotted curve of the difference that two asymptotic intercepts are described.

Figure 11 B is the plotted curve of the difference that two asymptotic intercepts are described.

Figure 12 is the flow chart illustrated for performing the program that engine start controls.

Figure 13 illustrates for performing the mobile flow chart promoting the program controlled.

Figure 14 is the flow chart illustrated for performing the program that idle running controls.

Figure 15 is the flow chart of the program illustrated for calculating ratio R.

Figure 16 is the plotted curve of another embodiment that ratio R is described.

Figure 17 A is the view of another embodiment that water of condensation reservoir is shown.

Figure 17 B is the view of another embodiment that water of condensation reservoir is shown.

Figure 17 C is the view of another embodiment that water of condensation reservoir is shown.

Figure 18 is the overall pattern of the explosive motor that another embodiment of the present invention is shown.

Figure 19 is the mobile time diagram promoting to control that the embodiment shown in Figure 18 is described.

Figure 20 illustrates for performing the mobile flow chart promoting the program controlled shown in Figure 19.

Figure 21 is the overall pattern of the explosive motor illustrated according to further embodiment of this invention.

Figure 22 is the mobile time diagram promoting to control that the embodiment shown in Figure 21 is described.

Figure 23 illustrates for performing the mobile flow chart promoting the program controlled shown in Figure 22.

Figure 24 A is the overall pattern of the explosive motor illustrated according to further embodiment of this invention.

Figure 24 B is the overall pattern of the explosive motor illustrated according to further embodiment of this invention.

Figure 24 C is the overall pattern of the explosive motor illustrated according to further embodiment of this invention.

Figure 25 is the overall pattern of the explosive motor illustrated according to further embodiment of this invention.

Figure 26 is the mobile time diagram promoting to control that the embodiment shown in Figure 25 is described.

Figure 27 illustrates for performing the mobile flow chart promoting the program controlled shown in Figure 26.

Figure 28 is the overall pattern of the explosive motor illustrated according to further embodiment of this invention.

Figure 29 is the mobile time diagram promoting to control that the embodiment shown in Figure 28 is described.

Figure 30 illustrates for performing the mobile flow chart promoting the program controlled shown in Figure 29.

Figure 31 illustrates the time diagram according to another embodiment.

Figure 32 is the flow chart illustrated for performing the program that the exhaust gas purification shown in Figure 31 controls.

Figure 33 illustrates for performing the mobile flow chart promoting the program controlled shown in Figure 31.

Figure 34 illustrates the time diagram according to further embodiment of this invention.

Figure 35 is the flow chart illustrated for performing the program that the engine stop shown in Figure 34 controls.

Figure 36 is the flow chart illustrated for performing the program that the engine start shown in Figure 34 controls.

Figure 37 illustrates the mobile flow chart promoting the program controlled for performing between the withholding period shown in Figure 34.

Figure 38 illustrates for performing the mobile flow chart promoting the program controlled during starts shown in Figure 34.

Figure 39 is the overall pattern of the explosive motor illustrated according to further embodiment of this invention.

Figure 40 is the mobile time diagram promoting to control that the embodiment shown in Figure 39 is described.

Figure 41 illustrates the mobile flow chart promoting the program controlled for performing between the withholding period shown in Figure 40.

Embodiment

With reference to Fig. 1, the body of 1 expression compression ignition internal combustion engine, the firing chamber of each cylinder of 2 expression, 3 represent the electric control type fuel injector injected fuel in firing chamber 2, and 4 represent intake manifold, and 5 represent gas exhaust manifolds.Intake manifold 4 is connected through the outlet of admission line 6 with the compressor 7c of exhaust turbine supercharger 7, and the entrance of compressor 7c is connected with air-strainer 9 through Air flow meter 8.Electric-controlled type closure 10 is configured with in admission line 6.In addition, around admission line 6, be configured with the cooling unit 11 for cooling the air inlet flowing through admission line 6 inside.On the other hand, gas exhaust manifold 5 is connected with the entrance of the exhaust driven gas turbine 7t of exhaust turbine supercharger 7, and the outlet of exhaust driven gas turbine 7t is connected with exhaust gas post-treatment device 20.

Gas exhaust manifold 5 and intake manifold 4 are connected to each other through exhaust gas recirculatioon (hereinafter referred to as " EGR ") path 12.Electric-controlled type EGR control valve 13 is configured with in EGR passage 12.In addition, in EGR passage 12, be configured with the cooling unit 14 for cooling the EGR gas flowing through EGR passage 12 inside.On the other hand, each fuel injector 3 is connected with common rail 16 through fuel feed pipe 15.The fuel from electric-controlled type variable displacement fuel pump 17 is supplied in this common rail 16.The fuel be supplied in common rail 16 is supplied to fuel injector 3 through each fuel feed pipe 15.In the embodiment shown in fig. 1, this fuel is made up of diesel oil.In another embodiment, explosive motor is formed by with the spark ignition type internal combustion engine of rare air fuel ratio combustion fuel.In this case, this fuel is made up of gasoline.

The outlet pipe 23 that exhaust gas post-treatment device 20 is provided with the outlet pipe 21 be connected with the outlet of exhaust driven gas turbine 7t, the catalytic converter 22 be connected with outlet pipe 21 and is connected with catalytic converter 22.The particulate filter 24 of wall-flow type is configured with in catalytic converter 22.

Catalytic converter 22 is provided with the temperature transducer 25 of the temperature for detecting particulate filter 24.In another embodiment, in outlet pipe 21, be configured with the temperature transducer of the temperature for detecting the exhaust flowed in particulate filter 24.In addition, in another embodiment, in outlet pipe 23, be configured with the temperature transducer of the temperature for detecting the exhaust of flowing out from particulate filter 24.The temperature of exhaust represents the temperature of particulate filter 24.

Catalytic converter 22 is also provided with the pressure loss sensor 26 of the pressure loss for detecting particulate filter 24.In the example depicted in fig. 1, pressure loss sensor 26 is made up of the pressure difference transducer of the pressure difference for detecting particulate filter 24 upstream and downstream.In another embodiment, pressure loss sensor 26 is by be arranged on outlet pipe 21 and the sensor detecting engine back pressure is formed.

On the other hand, gas exhaust manifold 5 is provided with fuel addition valve 27.This fuel addition valve 27 is supplied to the fuel from common rail 16.Fuel adds in gas exhaust manifold 5 from fuel addition valve 27.In another embodiment, fuel addition valve 27 is configured in outlet pipe 21.

Fig. 2 illustrates the cooling unit 14 be arranged in EGR passage 12.Cooling unit 14 be provided be connected with EGR passage 12 primary path 14a, be configured in cooler 14b around primary path 14a, return the bypass 14c of primary path 14a in cooler 14b upstream from primary path 14a branch and in cooler 14b downstream and optionally EGR gas be directed to the bypass control valve (BCV) 14d of the one primary path 14a and bypass 14c.When should cooling EGR gas time, bypass control valve (BCV) 14d is controlled as by the cool position shown in solid line in Fig. 2, and therefore EGR gas is directed into cooler 14b.In contrast, time not cooled when EGR gas is such as in blowdown firing, bypass control valve (BCV) 14d is controlled to the bypass position be shown in broken lines in Fig. 2, and therefore EGR gas walks around cooler 14b.In addition, bypass 14c is provided with the water of condensation reservoir 14e for being stored in the water of condensation formed in EGR passage 12 and cooling unit 14.In the embodiment shown in Figure 2, water of condensation reservoir 14e is made up of the recess of the bottom surface being formed in bypass 14c.

Refer again to Fig. 1, electronic control unit 30 is formed by being provided with the digital computer of component as ROM (ROM (read-only memory)) 32, RAM (random access memory) 33, CPU (microprocessor) 34, input port 35 and output port 36 that bidirectional bus 31 is connected to each other.The output signal of Air flow meter 8, temperature transducer 25 and pressure difference transducer 26 is input to input port 35 through the AD transducer 37 of correspondence respectively.In addition, accelerator pedal 39 is connected with load sensor 40, and described load sensor produces the output voltage proportional with the trampling amount L of accelerator pedal 39.The output voltage of load sensor 40 is input to input port 35 through the AD transducer 37 of correspondence.Engine body 1 has mounted thereto for detecting the cooling-water temperature sensor 41 of engine cooling water temperature and the oil temperature sensor 42 for detecting engine lubrication oil temperature.The output voltage of these sensors 41 and 42 is input to input port 35 through the AD transducer 37 of correspondence.In addition, input port 35 with whenever crankshaft rotating such as 15 ° time produce the crank angle sensor 43 exporting pulse and be connected.In CPU 34, the output pulse from crank angle sensor 43 is used as the basis of calculation engine rotating speed Ne.Input port 35 also receive as input, display ignition switch 44 and starter switch 45 signal of opening or closing.When starter switch 45 is opened, starter motor 46 start.On the other hand, output port 36 is connected with fuel injector 3, closure 10 drive unit, EGR control valve 13, bypass control valve (BCV) 14d, petrolift 17, fuel addition valve 27 and starter motor 46 through the driver circuit 38 of correspondence.

Fig. 3 A and Fig. 3 B illustrates the structure of wall-flow particulate filter 24.Note, Fig. 3 A illustrates the front view of particulate filter 24, and Fig. 3 B illustrates the side view cutaway drawing of particulate filter 24.As shown in Figure 3 A and Figure 3 B, particulate filter 24 forms the honeycomb structure being provided with the next door 72 of multiple exhaust air flow path 71i, 71o and these exhaust air flow paths of separation 71i, the 71o extended parallel to each other.In the embodiment as shown in fig. 3 a, exhaust air flow path 71i, 71o are by having the upstream extremity opened and the exhaust with the downstream closed by connector 73d is flowed into path 71i and has the upstream extremity closed by connector 73u and the exhaust outflow pathway 71o with the downstream opened is formed.Note, in figure 3 a, dashed area illustrates connector 73u.Therefore, exhaust flows into path 71i and is vented outflow pathway 71o and alternately configures via thin next door 72.In other words, exhaust flow into path 71i and exhaust outflow pathway 71o by separately by four exhaust outflow pathway 71o around exhaust flow into path 71i and separately by four exhaust inflow path 71i around exhaust outflow pathway 71o form.In another embodiment, exhaust air flow path flows into by the exhaust with upstream extremity and the downstream opened upstream extremity that path and having closed by connector and the exhaust outflow pathway with the downstream opened is formed.

Next door 72 is formed by the porous material of such as steinheilite, silicon carbide, silicon nitride, zirconium oxide, titanium dioxide, aluminium oxide, silica, mullite, petalite, basic zirconium phosphate and other this type of pottery and so on.Therefore, as shown in the arrow in Fig. 3 B, first exhaust flows into exhaust and flows in path 71i, then flows out to adjacent exhaust outflow pathway 71o by the next door 72 of surrounding.Like this, next door 72 forms the inner circumferential that exhaust flows into path 71i.Note, the average pore size in next door 72 is about 10 to 25 μm.

Next door 72 holds the catalyzer with oxidative function at two side surfaces and intrapore surface.The catalyzer with oxidative function is made up of platinum Pt, rhodium Rh, palladium Pd or other such precious metal.In another embodiment, the catalyzer with oxidative function is made up of the composite oxides comprising cerium Ce, praseodymium Pr, neodymium Nd, lanthanum La or other such underlying metal.In addition, in another embodiment, catalyzer is made up of the combination of precious metal and composite oxides.

Now, exhaust comprises the particulate matter formed primarily of solid carbon.This particulate matter is trapped on particulate filter 24.In this firing chamber 2, fuel burns under the oxygen of surplus.Therefore, only otherwise from fuel injector 3 and fuel addition valve 27 2 supply fuel, particulate filter 24 is just in oxidizing atmosphere.In addition, particulate filter 24 holds the catalyzer with oxidative function.As a result, the particulate matter be trapped on particulate filter 24 is oxidized in turn.In this respect, if the quantitative change of the particulate matter of unit time trapping must be greater than the amount of the particulate matter of unit time oxidation, then the amount being trapped in the particulate matter on particulate filter 24 increases along with the process of engine running time.

Therefore, in an embodiment according to the present invention, the PM for removing particulate matter from particulate filter 24 removes control and is repeatedly executed at predetermined intervals.As a result, the particulate matter on particulate filter 24 is removed and the pressure loss of particulate filter 24 reduces.

In the embodiment shown in fig. 1, PM removes and controls by making the temperature of particulate filter 24 increase and remain PM to remove temperature (such as 600 DEG C) to control to be formed by the intensification of oxidation removal particulate matter.In one embodiment, in order to perform heat up control, from fuel addition valve 27 add fuel and exhaust passageway or particulate filter 24 combustion fuel.In another embodiment, in compression stroke or exhaust stroke from fuel injector 3 burner oil.This fuel burns in firing chamber 2, exhaust passageway or particulate filter 24.

That is as shown in Figure 4, at time ta1, if the pressure loss of particulate filter 24,---i.e. pressure difference PD---becomes and be greater than CLV ceiling limit value UPD, then start PM and remove control, namely heat up control.Therefore, the temperature TF of particulate filter 24 rises and remains on PM removal temperature TFPM.As a result, pressure difference PD becomes more and more less.In addition, the amount QPM being deposited on the particulate matter on particulate filter 24 also becomes more and more less.Next, at time ta2, if particulate matter deposition QPM becomes be less than lower limit LQPM, then terminate PM and remove control.Therefore, the temperature TF of particulate filter 24 declines.Next, at time ta3, if pressure difference PD becomes be greater than CLV ceiling limit value UPD, then start PM and remove control.Next, at time ta4, if particulate matter deposition QPM becomes be less than lower limit LQPM, then terminate PM and remove control.In this way, repeatedly perform PM and remove control.

In one embodiment, particulate matter deposition QPM is by by drawing the increase qPMi of unit time and the reduction qPMd of unit time and the obtained Counter Value that the sum total of increase qPMi and reduction qPMd added up represents (QPM=QPM+qPMi-qPMd) based on engine operating status.As shown in Figure 5A, increase qPMi is stored in advance in ROM 32 (Fig. 1) with the form of arteries and veins spectrogram as the function of fuel injection amount QF and engine speed Ne.Fuel injection amount QF represents engine load.On the other hand, as shown in Figure 5 B, reduction qPMd is stored in advance in ROM 32 with the form of arteries and veins spectrogram as the function of the temperature TF of air inflow Ga and particulate filter 24.Air inflow Ga represents the flow flowing into exhaust in particulate filter 24 or oxygen.

Fig. 6 illustrates the program removing control for performing the PM shown in Fig. 4.With reference to Fig. 6, in step 101, differentiate whether the pressure difference PD of particulate filter 24 is greater than CLV ceiling limit value UPD.As PD > UPD, next, program goes to step 102, performs to heat up to control at this.That is, the desired value TTF of the temperature TF of particulate filter 24 is set as PM removes temperature TFPM.In the embodiment shown in fig. 1, the temperature of particulate filter 24 is controlled such that the true temperature of particulate filter 24 becomes desired value TTF.In following step 103, differentiate whether particulate matter deposition QPM is less than lower limit LQPM.As QPM >=LQPM, program returns step 102.As QPM < LQPM, end process circulation.Therefore, the control that heats up is terminated.In step 101, as PD≤UPD, end process circulation.In this case, the control that heats up is not performed.

Fig. 7 illustrates the program for count particles electrodeposition substance amount QPM.With reference to Fig. 7, in step 111, calculate increase qPMi by the arteries and veins spectrogram of Fig. 5 A.In following step 112, calculate reduction qPMd by the arteries and veins spectrogram of Fig. 5 B.In following step 113, count particles electrodeposition substance amount QPM (QPM=QPM+qPMi-qPMd).

In another embodiment, PM removal controls by the amount of the NOx in the exhaust for increasing in inflow particulate filter 24 to be formed by being oxidized the NOx amount increase control removing particulate matter with NOx.In order to increase the amount of NOx, such as, the amount of EGR gas is reduced.In another embodiment, PM is removed and controls to control to be formed with the ozone supply being removed particulate matter by ozone oxidation to particulate filter 24 ozone supply by from the ozone supply device be connected with the exhaust passageway being positioned at particulate filter 24 upstream.

In this respect, exhaust also comprises ashes.These ashes are also trapped in particulate filter 24 together with particulate matter.The present inventor confirms these ashes primarily of such as calcium sulfate CaSO ₄with calcium zinc orthophosphate activated by thallium Ca ₁₉zn ₂(PO ₄) ₁₄and so on calcium salt formed the fact.Calcium Ca, zinc Zn, phosphorus P etc. derive from engine lubricating oil, and sulphur S derives from fuel.That is, if with calcium sulfate CaSO ₄for example is described, then stream of engine lubricant to enter in firing chamber 2 and burns.The sulphur S of calcium Ca in lubricant oil in fuel is combined, and forms calcium sulfate CaSO thus ₄.

In this respect, even if perform PM to remove control, ashes also can not burn or gasify.That is ashes are not removed from particulate filter 24 and are retained in particulate filter 24.As a result, the pressure loss of particulate filter 24 or pressure difference PD increase along with the amount of the ashes be deposited on particulate filter 24.

That is if motor is from the state entry into service of new particulate filter 24, as shown in Figure 8 A, then along curve C T1, pressure difference PD increases from its initial value PD0, and particulate matter deposition QPM increases from its initial value of zero.Next, if pressure difference PD increases from CLV ceiling limit value UPD, then start PM and remove control.As a result, as shown in Figure 8 B, along curve C R1, pressure difference PD reduces from CLV ceiling limit value UPD, and particulate matter deposition QPM reduces from value QPM1.Next, if particulate matter deposition QPM becomes be less than lower limit LQPM, then terminate PM and remove control.As a result, as shown in Figure 8 C, along curve C T2, pressure difference PD increases from value PD1, and particulate matter deposition QPM increases from lower limit LQPM.Next, if pressure difference PD becomes be greater than CLV ceiling limit value UPD, then start PM and remove control.As a result, as in fig. 8d, along curve C R2, pressure difference PD reduces from CLV ceiling limit value UPD, and particulate matter deposition QPM reduces from value QPM2.Next, if particulate matter deposition QPM becomes be less than lower limit LQPM, then terminate PM and remove control.Like this, pressure difference PD and particulate matter deposition QPM increase and reduce alternately repeat.

From other angle, Fig. 8 A illustrates the first increase effect of pressure difference PD and particulate matter deposition QPM, Fig. 8 B illustrates the first reduction effect of pressure difference PD and particulate matter deposition QPM, Fig. 8 C illustrates the second increase effect of pressure difference PD and particulate matter deposition QPM, and Fig. 8 D illustrates the second reduction effect of pressure difference PD and particulate matter deposition QPM.

In this way, along with the engine running time is elongated, particulate matter deposition QPM reduces (QPM1 > QPM2) when PM removes and controls to start when the increase effect of pressure difference PD and particulate matter deposition QPM stops, namely, and pressure difference PD increases when the increase effect of pressure difference PD and particulate matter deposition QPM starts (PD0 < PD1 < PD2).As a result, the execution that PM removal controls often shifts to an earlier date relative to the best opportunity opportunity.In this case, PM Transformatin to be performed and fuel consumption non-preferentially increases by non-preferentially frequent.

On the other hand, generally speaking, can think that the ashes be deposited on particulate filter 24 are formed by the ashes A be deposited on a scattered manner as shown in Figure 9 A on the inner circumferential 71is of exhaust inflow path 71i and the one or both be deposited on partly as shown in Figure 9 B in the rear portion of exhaust inflow path 71i or the ashes A of bottom 71ir.In addition, be deposited on exhaust flow into ashes A on the inner circumferential 71is of path 71i on the pressure loss of particulate filter 24 or the impact of pressure difference PD large.In contrast, be deposited on ashes A that exhaust flows into the 71ir place, rear portion of path 71i on the pressure loss of particulate filter 24 or the impact of pressure difference PD little.

Since it is so, if the ashes A be deposited on inner circumferential 71is moves to rear portion 71ir, then the impact of ashes on pressure difference PD weakens.With regard to this point, a part that when the amount flowing into the exhaust in particulate filter 24 is large---time such as in high engine load operation---be deposited on the ashes A on inner circumferential 71is is moved to rear portion 71ir situation by exhaust stream may be there is.But, in this case, be difficult to mobile enough ashes.

Therefore, in an embodiment according to the present invention, the ashes A promoting to be deposited on the inner circumferential 71is being vented inflow path 71i flows into mobile promotion control from the rear portion 71ir movement of path 71i to exhaust is performed.As a result, the amount of the ashes on the inner circumferential 71is being deposited on exhaust inflow path 71i can be reduced and the impact of ashes on pressure difference PD can be kept little.Therefore, the opportunity performing PM removal control can be maintained the best opportunity.

In the embodiment shown in fig. 1, control by performing mobile promotion to particulate filter 24 feed fluid.This liquid is made up of the water of condensation be stored in water of condensation reservoir 14e.

In addition, in the embodiment shown in fig. 1, differentiate whether the amount being deposited on the ashes that exhaust flows on the inner circumferential 71is of path 71i is greater than predetermined upper limit amount.When the amount being determined as the ashes be deposited on inner circumferential 71is is greater than upper limit amount, performs mobile promotion when engine cold starting and control.In contrast, when the amount not being determined as the ashes be deposited on inner circumferential 71is is greater than upper limit amount, does not perform mobile promotion and control.Illustrate that this moves with reference to Figure 10 to promote to control.

In Fig. 10, solid line represents the situation performing mobile promotion and control, and dotted line represents the situation not performing and move and promote to control.With reference to Figure 10, at time tb1, ignition switch 44 is opened, and starter switch 45 is opened, and therefore motor starts to start.As a result, engine speed Ne rises.Next, exceed predetermined setting value NeC (such as 900rpm) at time tb2, engine speed Ne and complete detonation occurs.Next, when promoting to control with not performing shown in dotted line is mobile in such as Figure 10, perform common idle running and control.That is when engine running is blowdown firing, engine speed Ne maintains cold idle running speed NeIC (such as, the highest 1000rpm).In addition, EGR control valve 13 is closed, and therefore the feeding of EGR gas is prohibited.Next, at time tb4, when engine running is switched to warm running, engine speed Ne maintains warm idle running speed NeIW (such as 700 to 800rpm).In addition, the feeding of EGR gas is allowed.That is, according to the aperture DEGR of engine operating status control EGR control valve 13.Note, in the example depicted in fig. 1, when engine cooling water temperature and engine lubrication oil temperature are all lower than predetermined setting temperature (such as 20 DEG C), being determined as engine running is blowdown firing, and when the one or both in engine cooling water temperature and engine lubrication oil temperature is higher than setting temperature, being determined as engine running is warm running.

In contrast, when controlling with the mobile promotion shown in solid line during execution is as Figure 10, after the complete detonation of time tb2, engine speed Ne maintains predetermined mobile promotion idle running speed NeIT (such as, 1500rpm).This moves and promotes that idle running speed NeIT is set to higher than common idle running speed NeIC and NeIW.As a result, flow through intake manifold 4, firing chamber 2, gas exhaust manifold 5, outlet pipe 21 and particulate filter 24 the amount of gas increase.In addition, the aperture DEGR of EGR control valve 13 increases.In the example depicted in fig. 10, aperture DEGR is 100%, that is, EGR control valve 13 standard-sized sheet.Now, engine running is blowdown firing, and therefore the bypass control valve (BCV) 14d of cooling unit 14 is controlled to bypass position (Fig. 2).As a result, relatively large EGR gas flows through bypass 14c.This large amount of EGR gas makes water of condensation discharge from water of condensation memory section 14e.This water of condensation flows through intake manifold 4, firing chamber 2, gas exhaust manifold 5 and outlet pipe 21 in company with EGR gas and together in succession to delivering in particulate filter 24.

As a result, the ashes that exhaust flows on the inner circumferential 71is of path 71i are rinsed out by water of condensation and move to rear portion 71ir.Or ashes are soaked by water of condensation, the ash layers be formed in thus on the inner circumferential 71is of exhaust inflow path 71i is destroyed and ashes are easy to be separated with inner circumferential 71is.The ashes be separated with inner circumferential 71is are easy to be vented move to rear portion 71ir during engine running subsequently.

In this case, because engine running is blowdown firing, thus water of condensation as liquid to delivering to particulate filter 24, therefore reliably can promote the movement of ashes.Note, because mobile promotion controls, smaller and water hammer can not occur by the amount of the water of condensation of firing chamber 2.In addition, control if perform mobile promotion, be then deposited on particulate matter on inner circumferential 71is also posteriorly 71ir move.The particulate matter of movement is in this way removed by PM Transformatin subsequently.

Next, if having passed through predetermined set time tB at time tb3, then started common idle running and controlled.That is when engine running is blowdown firing, engine speed Ne maintains cold idle running speed NeIC and EGR control valve 13 is closed.Next, if switch to warm running at time tb4 engine running, then engine speed Ne maintains warm idle running speed NeIW and allows the feeding of EGR gas.

If specific fuel consumption when being new particulate filter by particulate filter 24 is called " fresh fuel consumption rate ", then the present inventor thinks, when the quantitative change of the ashes on the inner circumferential 71is being deposited on exhaust inflow path 71i must be greater than predetermined upper limit amount, specific fuel consumption is about 13% compared to the increasing amount of fresh fuel consumption rate.Next, after the mobile promotion of execution controls, specific fuel consumption is about 3% compared to the increasing amount of fresh fuel consumption rate.In this way, controlled by mobile promotion, reliably can suppress the increase of specific fuel consumption.

Such as differentiate whether the ashes on the inner circumferential 71is being deposited on exhaust inflow path 71i are greater than predetermined upper limit amount as follows.That is as shown in Figure 11 A, pressure difference PD and particulate matter deposition QPM changes along curve C T1 when the first increase effect.The asymptote AST1 of this curve C T1 is represented by following formula:

PD＝A1·QPM+(B1+C1)

In addition, pressure difference PD and particulate matter deposition QPM changes along curve C R1 when the first reduction effect.The asymptote ASR1 of this curve C R1 is represented by following formula:

PD＝A1·QPM+B1

Represent that the intercept of these two formulas is poor by C1.Note, B1 represents the pressure loss of particulate filter 24 itself and corresponds to PD0.

In an identical manner, as shown in Figure 11 B, pressure difference PD and particulate matter deposition QPM when the i-th increase effect along curve C Ti change (i=l, 2 ...).The asymptote ASTi of this curve C Ti is represented by following formula:

PD＝Ai·QPM+(Bi+Ci)

In addition, pressure difference PD and particulate matter deposition QPM changes along curve C Ri when the i-th reduction effect.The asymptote ASRi of this curve C Ri is represented by following formula:

PD＝Ai·QPM+Bi

Represent that the intercept of these two formulas is poor by Ci.

Intercept difference Ci representative has been deposited on the amount of the particulate matter on particulate filter 24 when the i-th increase effect of pressure difference PD and particulate matter deposition QPM.Or its represents the amount when the i-th reduction effect of pressure difference PD and particulate matter deposition QPM from the particulate matter of particulate filter 24 removal.The amount of this particulate matter along with the quantitative change being deposited on exhaust and flowing into the ashes on the inner circumferential 71is of path 71i must be larger and become less.Therefore, along with the amount of the ashes be deposited on the inner circumferential 71is of exhaust inflow path 71i increases, difference Ci or ratio R (=Ci/C1) become less.Note, Figure 11 A illustrates poor Ci or the large situation of ratio R, and Figure 11 B illustrates poor Ci or the little situation of ratio R.

Therefore, in the embodiment shown in fig. 1, when ratio R is less than predetermined lower limit RL, be determined as the amount being deposited on the ashes that exhaust flows on the inner circumferential 71is of path 71i and be greater than predetermined upper limit amount, and when ratio R is greater than lower limit RL, the amount being determined as the ashes be deposited on inner circumferential 71is is less than upper limit amount.

Figure 12 illustrates in the embodiment shown in fig. 1 for performing the program that engine start controls.This program only performs once when ignition switch 44 is opened.With reference to Figure 12, in step 121, reset mark X (X=0).Set this mark X (X=1) when common idle running control program (Figure 14) should be performed, otherwise it is reset (X=0).In following step 122, differentiate that whether engine speed Ne is higher than setting speed NeC.As Ne≤NeC, program returns step 122.As Ne > NeC, that is when there is complete detonation, following program goes to step 123, differentiates whether ratio R is less than lower limit RL at this.As R < RL, following program goes to step 124, differentiates whether engine running is blowdown firing at this.When engine running is blowdown firing, following program goes to step 125, performs mobile promotion control program at this.In following step 126, setting mark X (X=1).When in step 123R >=RL and when step 125 engine running is warm running, program goes to step 126.Therefore, in these cases, do not perform mobile promotion to control.

Figure 13 illustrates in the embodiment shown in fig. 1 for performing the mobile program promoting to control.This program such as performs in the step 125 of Figure 12.With reference to Figure 13, in step 131, rotating speed of target TNe is set as mobile promotion idle running speed NeIT.In the embodiment shown in fig. 1, engine speed is controlled such that practical engine speeds becomes rotating speed of target TNe.In following step 132, open EGR control valve 13.In following step 133, differentiate whether have passed through set time tB.When not yet through set time tB, program returns step 131.When have passed through set time tB, cycle for the treatment of terminates.That is, mobile promote to control to terminate and program goes to the step 126 of Figure 12.

Figure 14 illustrates the program controlled for performing common idle running.With reference to Figure 14, in step 141, differentiate whether the trampling amount L of accelerator pedal 39 is zero, that is whether engine running is idle running.As L > 0, that is when engine running is not idle running, cycle for the treatment of terminates.As L=0, that is when engine running is idle running, following program goes to step 142, differentiates whether set mark X at this.When marking X and being reset (X=0), cycle for the treatment of terminates.In contrast, when setting mark X (X=1), following program goes to step 143.Therefore, when setting mark X to the step 126 of the program at Figure 12 from engine start, program does not go to step 143.In step 143, differentiate whether engine running is blowdown firing.When engine running is blowdown firing, following program goes to step 144, at this, rotating speed of target TNe is set as cold idle running speed NeIC.In following step 146, close EGR control valve 13.In contrast, when engine running is warm running, program goes to step 146, at this, rotating speed of target TNe is set as warm idle running speed NeIW.In following step 147, allow the feeding of EGR gas.

Figure 15 illustrates the program for calculating ratio R.With reference to Figure 15, in step 151, read pressure difference PD.In following step 152, read the amount QPM of particulate matter.In following step 153, differentiate that PM removes and control whether switch to stopping from execution.When PM controls not yet to switch to stopping from execution, next, program goes to step 154, differentiates that PM removes control whether to switch to execution from stopping at this.Control from when stopping switching to execution when PM removes, cycle for the treatment of terminates.Control from when stopping switching to execution when PM removes, that is at the end of the i-th increase effect of pressure difference PD and particulate matter deposition QPM, program goes to step 155, determines the asymptote ASTi of the curve C Ti of the i-th increase effect at this.Next, when PM removal controls to switch to stopping from execution, that is, at the end of the i-th reduction effect of pressure difference PD and particulate matter deposition QPM, program goes to step 156 from step 153, determines the asymptote ASRi of the curve C Ri of the i-th reduction effect at this.In following step 157, calculate intercept difference Ci.In following step 158, calculating ratio R (R=Ci/C1).In following step 159, parameter " i " is increased progressively (i=i+1) with 1.Note, parameter " i " is set to 1 when engine start.

Next, with reference to Figure 16, another embodiment of ratio R will be described.As shown in figure 16, pressure difference PD reduces with Di (=UPD-PD (i+1)) due to the i-th reduction effect.Decrease Di or ratio Di/D1 along with the quantitative change being deposited on exhaust and flowing into the ashes on the inner circumferential 71is of path 71i must be larger and become less.Therefore, with the form calculus ratio R of Di/D1.In another embodiment, when the Ci or decrease Di that is on duty is less than predetermined lower limit, be determined as the amount being deposited on the ashes that exhaust flows on the inner circumferential 71is of path 71i and be greater than predetermined upper limit amount, and the Ci or decrease Di that is on duty is when being greater than lower limit, the amount being determined as the ashes be deposited on inner circumferential 71is is less than upper limit amount.

Figure 17 A to Figure 17 C illustrates another embodiment of water of condensation reservoir 14e.In the embodiment shown in Figure 17 A, the bypass 14c of cooling unit 14 is bent downwardly.Water of condensation reservoir 14e is made up of the curved part of bypass 14c.In the embodiment shown in Figure 17 B, water of condensation reservoir 14e is made up of the recess of the bottom surface being formed in intake manifold 4.In the embodiment shown in Figure 17 C, water of condensation reservoir 14e is made up of the recess of the bottom surface being formed in gas exhaust manifold 5.Note, in the embodiment shown in Figure 17 B and Figure 17 C, EGR control valve 13 is closed during control mobile promotion.In another embodiment, water of condensation reservoir 14e by be formed in exhaust turbine supercharger 7 housing bottom surface in recess or the recess be formed in the bottom surface of outlet pipe 21 form.

Figure 18 illustrates according to another embodiment of the present invention.With reference to Figure 18, particulate filter 24 holds NOx reducing catalyst 24a.This NOx reducing catalyst 24a possesses the function by the NOx in reducing agent reduction exhaust in the oxidizing atmosphere comprising reducing agent.NOx reducing catalyst 24a is such as made up of the carrier formed with the titanium dioxide being carried with vanadium oxide (i.e. vanadium-titanium deoxide catalyst) or the carrier (i.e. copper-zeolite catalyst) that formed with the zeolite being carried with copper.In another embodiment, NOx reducing catalyst is configured in the downstream of particulate filter 24.

Be arranged in the outlet pipe 21 of NOx reducing catalyst 24a upstream, be configured with the reducing agent interpolation valve 50 adding reducing agent for secondary in exhaust.Reducing agent adds valve 50 and is connected with reducing agent tank 52 through reducing agent feed tube 51.In reducing agent feed tube 51, be configured with variable head pressure formula reducing agent pump 53.In the example shown in Figure 18, reducing agent is made up of aqueous solution of urea.The reducing agent tank 52 stored urea aqueous solution.

During usual running after engine start completes, add valve 50 from reducing agent and add reducing agent with reducing NOx.Next this reducing agent is fed into NOx reducing catalyst 24a.As a result, NOx is reduced in NOx reducing catalyst 24a.In this case, reducing agent added from reducing agent interpolation valve 50 with NOx reduction interpolation pressure and NOx reduction interpolation time.Select these NOx reduction to add pressure and NOx reduction interpolation time according to engine operating status, reducing agent (i.e. aqueous solution of urea) can be fully atomized.

In the embodiment shown in Figure 18, promote that the liquid of supply in control is made up of the reducing agent (i.e. aqueous solution of urea) added from reducing agent interpolation valve 50 mobile.That is as shown in figure 19, after the engine start of time tc1, if there is complete detonation at time tc2, then engine speed Ne maintains mobile promotion idle running speed NeIT.As a result, the amount of the exhaust of circulation in particulate filter 24 increases.Now, reducing agent is with mobile, liquid form promotes that adding pressure adds from reducing agent interpolation valve 50.This liquid reducer is supplied to particulate filter 24 by exhaust.As a result, the movement that exhaust flows into ashes on the inner circumferential 71is of path 71i posteriorly 71r is facilitated.Next, if having passed through mobile promotion interpolation time tC at time tc3, then started common idle running and controlled.In addition, the interpolation of stop liquid reducing agent.That is, make mobile promotion control to stop.

Move promotion interpolation pressure to be configured to reducing agent can not be atomized be also that liquid form is supplied to particulate filter 24 too much with the mobile promotion interpolation time.That is reducing agent is to promote to add pressure or add with the mobile promotion interpolation time longer than the NOx reduction interpolation time with adding stressed movement lower than NOx reduction.Note, set mobile promotion interpolation pressure according to engine operating status and promote the interpolation time with mobile.In the embodiment shown in Figure 18, mobilely promote to add pressure and become larger along with air inflow and become higher and become higher along with the temperature of the exhaust in inflow particulate filter 24 and become higher.In addition, mobile promote the interpolation time along with the pressure in outlet pipe 21 become higher and become longer and along with the amount being deposited on exhaust and flowing into the ashes on the inner circumferential 71is of path 71i larger and become longer.

Figure 20 illustrates for performing the mobile program promoting to control shown in Figure 19.This program such as performs in the step 125 of Figure 12.With reference to Figure 19, in step 161, rotating speed of target TNe is set as mobile promotion idle running speed NeIT.In following step 162, calculate mobile promotion and add pressure.In following step 163, calculate the mobile promotion interpolation time.In following step 164, promote to add pressure and move to promote the interpolation time to add valve 50 from reducing agent and add reducing agent with mobile.Next, end process circulation.That is, terminate mobile to promote to control and program goes to the step 126 of Figure 12.

Next, by mobile another embodiment promoting to control in the embodiment shown in explanatory drawing 1 or Figure 18.In this embodiment, the liquid of mobile promotion control is supplied to by the fuel mix added from fuel addition valve 27.The fuel added from fuel addition valve 27 is used for being supported at the catalyzer reducing NOx on particulate filter 24.Or it controls for above-mentioned intensification.

When mobile promotion must be performed to be controlled, from fuel addition valve 27 adding liquid fuel.In this case, fuel is added with the interpolation pressure lower than the interpolation pressure for NOx reduction or the control that heats up or the interpolation time longer than the interpolation time being used for NOx reduction or the control that heats up.As a result, fuel is that liquid form is added into particulate filter 24.

If liquid adds valve 50 (Figure 18) from reducing agent in this way or fuel addition valve 27 (Fig. 1) is added for mobile promotion control, then do not need other configuration.

Figure 21 illustrates according to still another embodiment of the invention.With reference to Figure 21, liquid adds valve 55 and is configured in EGR passage 12 with to secondary adding liquid in EGR gas.Liquid adds valve 55 and is connected with flow container 57 through liquid feed tube 56.In liquid feed tube 56, be configured with variable displacement liquor pump 58.In the example shown in Figure 21, liquid is made up of water.Water is stored in flow container 57.In another embodiment, liquid is made up of the aqueous solution or liquid fuel.

In the embodiment shown in Figure 21, promote that the liquid of supply in control is made up of the liquid (i.e. water) added from liquid interpolation valve 55 mobile.That is as shown in figure 22, if there is complete detonation at time td2 after the engine start of time td1, then engine speed Ne maintains mobile promotion idle running speed NeIT.In addition, EGR control valve 13 is opened.Now, promote that adding pressure adds water from liquid interpolation valve 55 with mobile.This water is supplied to particulate filter 24 by exhaust.As a result, the movement that exhaust flows into ashes on the inner circumferential 71is of path 71i posteriorly 71r is facilitated.In this case, mobile promotion interpolation pressure promotes the interpolation time to be configured to make water be that liquid form is supplied to particulate filter 24 with mobile.Next, if having passed through mobile promotion interpolation time tD at time td3, then start common idle running and control.In addition, the interpolation of water is made to stop.That is, make mobile promotion control to stop.

Figure 23 illustrates for performing the mobile program promoting to control shown in Figure 22.This program such as performs in the step 125 of Figure 12.With reference to Figure 23, in step 171, rotating speed of target TNe is set as mobile promotion idle running speed NeIT.In following step 172, open EGR control valve 13.In following step 173, calculate mobile promotion and add pressure.In following step 174, calculate the mobile promotion interpolation time.In following step 175, promote to add pressure and move to promote that the interpolation time adds valve 55 adding liquid from liquid with mobile.Next, end process circulation.That is, terminate mobile to promote to control and program goes to the step 126 of Figure 12.

In the embodiment shown in Figure 24 A, liquid adds valve 55 and is configured in admission line 6.In the embodiment shown in Figure 24 B, liquid adds valve 55 and is configured in gas exhaust manifold 5.In the embodiment shown in Figure 24 C, liquid adds valve 55 and is configured in outlet pipe 21.Note, in the embodiment shown in Figure 24 A to Figure 24 C, EGR control valve 13 is closed during control mobile promotion.

Figure 25 illustrates according to still another embodiment of the invention.With reference to Figure 25, be configured with the gas exhausting valve 60 that can open and close outlet pipe 23 at the outlet pipe 23 being positioned at particulate filter 24 downstream.Gas exhausting valve 60 is set to standard-sized sheet usually.

In the embodiment shown in Figure 25, mobile promotion controls to be made up of the generation of the pressure pulsation in particulate filter 24.That is as shown in figure 26, if there is complete detonation at time te2 after the engine start of time te1, then engine speed Ne maintains mobile promotion idle running speed NeIT.Now, gas exhausting valve 60 alternately opening and closing repeatedly.As a result, the pressure in particulate filter 24 is pulsed.Due to this pressure pulsation, the ash layers be formed on the inner circumferential 71is of exhaust inflow path 71i is destroyed and ashes are easy to peel off from inner circumferential 71is.The ashes peeled off from inner circumferential 71is are easy to be vented move to rear portion 71ir during engine running subsequently.Next, if having passed through predetermined set time tE at time te3, then started common idle running and controlled.In addition, gas exhausting valve 60 maintains standard-sized sheet.That is, make mobile promotion control to stop.

Figure 27 illustrates for performing the mobile program promoting to control shown in Figure 26.This program such as performs in the step 125 of Figure 12.With reference to Figure 27, in step 181, rotating speed of target TNe is set as mobile promotion idle running speed NeIT.In following step 182, gas exhausting valve 60 opening and closing repeatedly.In following step 183, differentiate whether have passed through set time tE.When not yet through set time tE, program returns step 181.When have passed through set time tE, end process circulation.That is, stop mobile promoting to control and program goes to the step 126 of Figure 12.

Figure 28 illustrates according to still another embodiment of the invention.With reference to Figure 28, catalytic converter 22 has vibrator 61 mounted thereto.

In the embodiment shown in Figure 28, mobile promotion controls forming by the vibration at particulate filter 24 place.That is as shown in figure 29, after the engine start of time tf1, if there is complete detonation at time tf2, then engine speed Ne maintains mobile promotion idle running speed NeIT.Now, vibrator 61 start.As a result, particulate filter 24 is made to vibrate.Due to this vibration, the ash layers be formed on the inner circumferential 71is of exhaust inflow path 71i is destroyed and ashes are easy to be separated with inner circumferential 71is.The ashes be separated with inner circumferential 71is are easy to be vented move to rear portion 71ir during engine running subsequently.Next, if having passed through predetermined set time tF at time tf3, then started common idle running and controlled.In addition, vibrator 61 is made to stop.That is, make mobile promotion control to stop.

Figure 30 illustrates for performing the mobile program promoting to control shown in Figure 29.This program such as performs in the step 126 of Figure 12.With reference to Figure 30, in step 191, rotating speed of target TNe is set as mobile promotion idle running speed NeIT.In following step 192, vibrator 61 start.In following step 193, differentiate whether have passed through set time tF.When not yet through set time tF, program returns step 191.When have passed through set time tE, cycle for the treatment of terminates.That is, make mobile to promote to control to stop and program goes to the step 126 of Figure 12.

Figure 31 illustrates another embodiment of the present invention.Promote in control the mobile of the embodiment shown in Figure 31, first, perform when the temperature TF of particulate filter 24 rises to and removes control the high mobile temperature TFT of promotion than PM and control for moving the intensification promoted.Next, the amount increase that air displacement increases the exhaust controlled temporarily to make circulation in particulate filter 24 is performed.As a result, ashes shrink due to heating, and the ash layers be formed on the inner circumferential 71is of exhaust inflow path 71i is destroyed, and ashes are easy to peel off from inner circumferential 71is.The ashes peeled off from inner circumferential 71is easily and the exhaust be reliably increased moves to rear portion 71ir.Note, mobile promotion temperature TFT is such as 630 DEG C to about 1100 DEG C.

The mobile promotion of this embodiment performs during the usual running controlled after engine start completes.That is, as shown in figure 31, at time tg1, start PM and remove control, make the temperature TF of particulate filter 24 rise to PM thus and remove temperature TFPM.Next, at time tg2, particulate matter deposition QPM becomes to be less than lower limit LQPM and to terminate PM and removes control.After PM removes control, start mobile promotion and control.Particularly, first, start to control for the mobile intensification promoted.That is, make the temperature TF of particulate filter 24 remove temperature TFPM from PM and rise to mobile promotion temperature TFT and remain on this temperature.So, the energy needed for intensification control being used for mobile promotion can be reduced.Next, if having passed through predetermined set time tG1 at time tg3, then terminate to control for the mobile intensification promoted.Next, start air displacement and increase control.As a result, the air displacement QEX flowing through particulate filter 24 increases.Next, if having passed through predetermined set time tG2 at time tg4, then terminated air displacement and increased control.Therefore, mobile promotion controls to terminate.

Note, controlling for the mobile intensification promoted to perform, in one embodiment, adding fuel from fuel addition valve 27.This fuel burns in exhaust passageway or particulate filter 24.In another embodiment, fuel to spray and this fuel burns firing chamber 2, exhaust passageway or particulate filter 24 from fuel injector 3 in compression stroke or exhaust stroke.On the other hand, increasing control to perform air displacement, improving engine speed or increasing throttle opening.

Figure 32 illustrates the program controlled for performing the exhaust gas purification shown in Figure 31.With reference to Figure 32, in step 201, perform the PM shown in Fig. 6 and remove control program.In following step 202, differentiate whether ratio R is less than lower limit RL.As R < RL, following program goes to step 203, performs mobile promotion control program at this.In contrast, as R >=RL, end process circulation.Therefore, in this case, mobile promotion control program is not performed.

Figure 33 illustrates for performing the mobile program promoting to control shown in Figure 31.This program such as performs in the step 203 of Figure 32.With reference to Figure 33, in step 211, the desired value TTF of the temperature TF of particulate filter 24 is set as mobile promotion temperature TFT.In following step 212, differentiate whether have passed through set time tG1.When not yet through set time tG1, program returns step 211.When have passed through set time tG1, following program goes to step 213, performs air displacement increase control at this.In following step 214, differentiate whether have passed through set time tG2.When not yet through set time tG2, program returns step 213.When have passed through set time tG2, end process circulation.That is air displacement increases control and terminates, therefore terminate mobile promotion and control.

In another embodiment, eliminate air displacement and increase control.In this case, the ashes by controlling to peel off from inner circumferential 71is for the mobile intensification promoted are easy to be vented move to rear portion 71ir during engine running subsequently.

Figure 34 illustrates mobile another embodiment promoting to control in the embodiment shown in Figure 24 C.In the embodiment shown in Figure 34, mobile to promote to control by the withholding period performed when engine stop between mobile during starts mobile promoting to control and perform when motor starts subsequently promote that control is formed.

That is, as shown in figure 34, if closed in time th1 ignition switch 44, then stop engine running.As a result, engine speed Ne drops to zero.Next, if having passed through predetermined set time tH1, then mobile promotion theed perform between withholding period controls.That is, promote that adding pressure adds valve 55 adding liquid from liquid with mobile.As a result, the ashes that exhaust flows on the inner circumferential 71is of path 71i are rinsed out by water of condensation and move to rear portion 71ir.Or ashes are soaked by water of condensation, the ash layers be formed on the inner circumferential 71is of exhaust inflow path 71i is destroyed, and ashes are easy to peel off from inner circumferential 71is.Note, set time tH1 be set to reduce particulate filter 24 temperature TF with make from liquid add valve 55 add liquid can not gasify in particulate filter 24 needed for time.Next, if promote that interpolation time tH2 with the addition of liquid, then the interpolation of stop liquid at time th3 with mobile.That is, make mobile promotion the between withholding period control to stop.

Next, at time th4, open ignition switch 44 and pilot engine.Next, if there is complete detonation at time th5, then mobile promotion theed start during starts controls.That is engine speed Ne maintains mobile promotion idle running speed NeIT.As a result, the amount of the exhaust of circulation in particulate filter 24 increases.Therefore, the ashes that the inner circumferential 71is flowing into path 71i from exhaust peels off are easy to move to rear portion 71ir.Next, if having passed through predetermined set time tH3 at time th6, then started common idle running and controlled.That is mobile promotion of the period that stops controls.

Figure 35 illustrates the program controlled for performing the engine stop shown in Figure 34.This program only performs once when ignition switch 44 is closed.With reference to Figure 35, in step 221, reset mark XX (XX=0).Set this mark XX (XX=1) when mobile promotion during starts should be performed to be controlled, otherwise reset (XX=0).In following step 222, engine running is stopped.In following step 223, differentiate whether ratio R is less than lower limit RL.As R < RL, following program goes to step 224, performs the mobile promotion control program between withholding period at this.In following step 225, setting mark XX (XX=1).In following step 226, stop the energising of electronic control unit 30.Next, end process circulation.In contrast, as R >=RL, program goes to step 226 from step 223.Therefore, in this case, do not perform mobile promotion to control.

Figure 36 illustrates the program controlled for performing the engine start shown in Figure 34.This program performs once when ignition switch 44 is opened.With reference to Figure 36, in step 231, reset the mark X (X=0) illustrated with reference to Figure 12.In following step 232, differentiate that whether engine speed Ne is higher than setting speed NeC.As Ne≤NeC, program returns step 232.As Ne > NeC, that is when there is complete detonation, following program goes to step 233, differentiates at this mark XX whether setting and illustrate with reference to Figure 35.When setting mark XX (XX=1), following program goes to step 234, at this execution mobile promotion control program during starts.In following step 235, setting mark X (X=1).When having reset mark XX (XX=0) in step 233, program has gone to step 235.Therefore, in this case, the mobile promotion do not performed during starts controls.

Figure 37 illustrates the mobile program promoting to control for performing between the withholding period shown in Figure 34.This program such as performs in the step 224 of Figure 35.With reference to Figure 37, in step 241, differentiate self ignition switch 44 plays whether have passed through set time tH1 when cutting out.When not yet through set time tH1, program returns step 241.When have passed through set time tH1, following program goes to step 242, calculates mobile promotion add pressure at this.In following step 243, calculate the mobile promotion interpolation time.In following step 244, promote to add pressure and move to promote that the interpolation time adds valve 55 adding liquid from liquid with mobile.Next, end process circulation.That is to terminate between withholding period mobile promotes to control and program goes to the step 225 of Figure 35.

Figure 38 illustrates for performing the mobile program promoting to control during starts shown in Figure 34.This program such as performs in the step 234 of Figure 36.With reference to Figure 38, in step 251, rotating speed of target TNe is set as mobile promotion idle running speed NeIT.In following step 252, differentiate whether have passed through set time tH3.If not yet through set time tH3, then program returns step 251.When have passed through set time tH3, end process circulation.That is the period that stops mobile promotes to control and program goes to the step 235 of Figure 36.

Figure 39 illustrates according to still another embodiment of the invention.The difference of the embodiment shown in the embodiment shown in Figure 39 and Figure 34 is, catalytic converter 24 is had cooler 62 mounted thereto and solidified by cooler 62 to the liquid that particulate filter 24 adds.

That is as shown in figure 40, if closed in time tj1 ignition switch 44, then engine running stops, then through predetermined set time tJ1, the mobile promotion performed between withholding period controls.That is, promote that adding pressure adds valve 55 adding liquid from liquid with mobile.As a result, the ashes that exhaust flows on the inner circumferential 71is of path 71i are rinsed out by water of condensation and move to rear portion 71ir.Or ashes are soaked by water of condensation, the ash layers be formed on the inner circumferential 71is of exhaust inflow path 71i is destroyed, and ashes are easy to be separated with inner circumferential 71is.Note, set time tJ1 is set in the mode identical with above-mentioned set time tH1.

Next, if promote that interpolation time tJ2 with the addition of liquid, then the interpolation of stop liquid at time tj3 with mobile.Next, if tj4 from liquid add stop have passed through predetermined set time tJ3, then cooler 62 start and make to particulate filter 24 add liquid solidify.As a result, expansion of liquids, the ash layers be therefore formed on the inner circumferential 71is of exhaust inflow path 71i is destroyed further.Therefore, ashes are easier peels off from inner circumferential 71is.Next, at time tj5, if having passed through predetermined set time tJ4, then stop cooler 62.That is, make mobile promotion the between withholding period control to stop.Note, the liquid that set time tJ4 is set to add to particulate filter 24 fully solidifies the required time.

Next, at time tj6, open ignition switch 44 and pilot engine.Now, the liquid fusing of solidifying.Next, at time tj7, if there is complete detonation, then mobile promotion theed start during starts controls.That is engine speed Ne maintains mobile promotion idle running speed NeIT.As a result, the amount flowing through the exhaust of particulate filter 24 inside increases.Therefore, the ashes that the inner circumferential 71is flowing into path 71i with exhaust is separated are easy to posteriorly 71ir and move.Next, at time tj8, when have passed through predetermined set time tJ5, starting common idle running and controlling.That is mobile promotion of the period that stops controls.

Figure 41 illustrates the mobile program promoting to control for performing between the withholding period shown in Figure 39.This program such as performs in the step 224 of Figure 35.With reference to Figure 41, in step 261, differentiate self ignition switch 44 plays whether have passed through set time tJ1 when being closed.When not yet through set time tJ1, program returns step 261.When have passed through set time tJ1, following program goes to step 262, calculates mobile promotion add pressure at this.In following step 263, calculate the mobile promotion interpolation time.In following step 264, promote to add pressure and move to promote that the interpolation time adds valve 55 adding liquid from liquid with mobile.In following step 265, when judging self-stopping technology adding liquid, play whether have passed through set time tJ3.When not yet through set time tJ3, program returns step 265.When have passed through set time tJ3, following program goes to step 266, in this cooler 62 start.In following step 267, differentiate whether have passed through set time tJ4 from cooler 63 start.When not yet through set time tJ4, program returns step 266.When have passed through set time tJ4, next end process circulation.That is to terminate between withholding period mobile promotes to control and program goes to the step 225 of Figure 35.

Note, in the embodiment shown in Figure 34, the atmospheric temperature when engine running stops may being there is and become quite low and the situation of solidifying to the liquid that particulate filter 24 adds.In this case, equally, be formed in the ash layers that exhaust flows on the inner circumferential 71is of path 71i and destroyed further, ashes are easy to posteriorly 71ir and move thus.

Reference numerals list

1 engine body

12 EGR passage

14e water of condensation reservoir

21 outlet pipes

24 particulate filters

26 pressure difference transducers

71i exhaust flows into path

71o is vented outflow pathway

72 next doors

Claims

1. the emission control system of an explosive motor, described emission control system is provided with the particulate filter for trapping the particulate matter comprised in exhaust in engine exhaust passage, described particulate filter is provided with the exhaust that the next door via porous alternately configures and flows into path and exhaust outflow pathway, and the feature of described emission control system is that this system comprises:

Mobile promotion device, described mobile promotion device is for promoting that being deposited on the described ashes be vented in the inner circumferential flowing into path moves to the described rear portion flowing into path that is vented;

Detection device, described detection device is for detecting the pressure loss of described particulate filter; With

PM removal device, described PM removal device is used for the PM performed when the detected pressure loss is greater than predetermined CLV ceiling limit value for removing particulate matter from described particulate filter and removes control.

2. the emission control system of explosive motor as claimed in claim 1, it is characterized in that, whether the described mobile amount promoting that device differentiation has been deposited on the ashes that described exhaust flows in the inner circumferential of path is greater than predetermined upper limit amount and performs mobile promotion when the amount being determined as described ashes is greater than described predetermined upper limit amount controls.

3. the emission control system of explosive motor as claimed in claim 1 or 2, is characterized in that, described mobile promotion device, to described particulate filter feed fluid, controls to perform described mobile promotion.

4. the emission control system of explosive motor as claimed in claim 3, it is characterized in that, described liquid is made up of at least one in water, the aqueous solution and liquid fuel.

5. the emission control system of the explosive motor as described in claim 3 or 4, it is characterized in that, engine charge path, the engine exhaust passage being arranged in described particulate filter upstream and at least one of exhaust gas recirculatioon path described engine charge path and engine exhaust passage are connected to each other are formed with water of condensation reservoir, described water of condensation reservoir is stored in the water of condensation that described explosive motor produces, and described mobile promotion device supplies the water of condensation be stored in described water of condensation reservoir to described particulate filter, control to perform described mobile promotion.

6. the emission control system of the explosive motor according to any one of claim 3 to 5, it is characterized in that, described system also comprises: NOx reducing catalyst, and described NOx reducing catalyst is configured in described particulate filter or is configured in the engine exhaust passage being arranged in described particulate filter downstream; Reducing agent adds valve, and described reducing agent adds valve and liquid reducer secondary added to the engine exhaust passage being arranged in described particulate filter upstream; With NOx reduction device, described NOx reduction device is used for for the NOx reduction interpolation pressure of reducing NOx and NOx reduction interpolation time from described reducing agent interpolation valve adding liquid reducing agent, and described mobile promotion device is to add the low interpolation pressure of pressure or to add valve adding liquid reducing agent with the interpolation time longer than the described NOx reduction interpolation time from described reducing agent than described NOx reduction, control to perform described mobile promotion.

7. the emission control system of the explosive motor according to any one of claim 1 to 6, is characterized in that, the described mobile pressure pulsation that device makes described particulate filter inside that promotes, controls to perform described mobile promotion.

8. the emission control system of the explosive motor according to any one of claim 1 to 7, is characterized in that, described mobile promotion device makes described particulate filter vibrate, and controls to perform described mobile promotion.

9. the emission control system of the explosive motor according to any one of claim 1 to 8, it is characterized in that, described mobile promotion device makes the temperature of described particulate filter rise to the temperature higher than temperature during PM removal control, promotes control to perform described movement.

10. the emission control system of explosive motor as claimed in any one of claims 1-9 wherein, is characterized in that, described mobile promotion device feeds liquid to described particulate filter and described liquid is solidified, and controls to perform described mobile promotion.