CN105673142A - Method and system for ridding dust inside a fine particle removing and filtering device - Google Patents

Abstract

The invention provides a method and a system which reduce the dust loads on PF by the injection of water. According to one embodiment of the invention, water is sprayed out from a water container to a PF and a tri-catalyst to reduce the dust loads.

Description

For the method for ash content removed in particulate filter and system

Technical field

This specification sheets relates generally to method and the system of the ash content for removing in emission control system (ash).

Background technology

The exhaust discharged from oil engine can comprise heterogeneous mixture, its can comprise gaseous effluent and form particulate matter (PM) condensed phase material (liquid and solid), gaseous effluent such as carbon monoxide (CO), unburned hydrocarbon class (HC), oxynitrides (NO_x). Transition-metal catalyst and base group's metal catalyst coated catalysts carrier together with base material (substrate) usually, to provide the ability that some (if the not every words) in these exhaust components change into other compounds to engine exhaust system.

Exhaust after treatment system can comprise three-way catalyst (TWC) and particulate filter (PF). TWC is provided for gaseous effluent and flows through and experience the passage with the redox reaction of catalyst component. TWC can not comprise binding agent, and PF can comprise binding agent to catch PM.

As time goes on, the variable full and regenerative operation of PF can be used for removing the particulate trapped. Regenerate to relate to and the temperature of particulate filter is increased to relatively high temperature, such as 600 DEG C, the particle burning gathered is become ash content.

The latent defect of regenerative process be the regenerative process in spark ignition engine after ash content gather. The water evaporation that the high exhaust temperature (such as, 550 DEG C) of spark ignition engine discharges after making burning, thus prohibit the ability that water removes the ash content from exhaust-duct. Such as, this usual and diesel motor formation contrast, in diesel motor, does not evaporate due to lower exhaust temperature (90 DEG C) water and can reduce ash content load. An exemplary trial of solution ash accumulation comprises injection air, and to reduce, ash content gathers, such as described in the U.S. Patent No. 2011/0120090 of the people such as Sorensen. Therefore, oxygen injection is used for further combust accumulation and it is removed from PF.

But, contriver herein also has recognized that the potential problems of this type systematic. As an example, exhaust temperature can be increased on the threshold value that strainer can be made to deteriorate by the oxygen injection of PF upstream. By injection air to initiate regeneration, can more be difficult to adjustment regeneration temperature and PF temperature is increased to the temperature that PF can deteriorate.

Summary of the invention

In one example, the problems referred to above by a kind of for by from reservoir jet of water between catalyst brick and particulate filter method solve. By this way, jet of water carries ash content towards the rear portion of PF and ash content is carried out PF, and exhaust temperature remains on the temperature in the scope not making PF deteriorate simultaneously. Further, jet of water can increase the ability that PF catches discharge particulate.

Above-mentioned discussion comprises by done by this paper contriver and be not considered as usually known understanding.Thus, it is to be understood that provide foregoing invention content to be that these concepts are further described in a specific embodiment in order to introduce some concepts in simplified form. This does not also mean that the key or essential characteristic of determining claimed theme, it is desired to the scope of the theme of protection is uniquely limited by the claim enclosed. In addition, claimed theme is not limited to solve the enforcement mode of above-mentioned or that any part is pointed out in the disclosure any shortcoming.

Accompanying drawing explanation

Fig. 1 illustrates the schematic diagram of the engine with the three-way catalyst (TWC) in particulate filter (PF) upstream.

Fig. 2 illustrates and a kind of schema performing the directly illustrative methods of injection for regeneration of particle filters and between TWC and PF is described.

Fig. 3 illustrates the schema showing a kind of illustrative methods directly spraying fluid for the gap location between TWC and PF.

Fig. 4 illustrates the chart illustrated for the various engines situation initiating jet of water.

Embodiment

Hereinafter describe and relate to one for spraying water to reduce the method near the ash content load on particulate filter (PF) surface of the position between the PF in three-way catalyst (TWC) downstream. PF and TWC can be arranged in engine exhaust emission control system. Engine exhaust emission control system can comprise injector ports and pressure transmitter. Further, jet of water can be used for keeping PF temperature.

PF can catch and store cigarette grain. Soot load can reduce the evacuation circuit through PF, and along with soot load increase, the evacuation circuit through PF can fully be obstructed to create the back pressure undesirably measured that can reduce motor efficiency. In order to reduce this type of back pressure, it is greater than threshold value exhaust pressure in response to exhaust pressure, PF can be occurred to regenerate. When PF experience regeneration time, a part for cigarette grain changes into gas, and separate be partially converted into ash content. Ash content can accumulate near on the PF in the space between TWC and PF. After some (such as, 100) PF regenerates, ash content load can cause the exhaust back pressure of increase and/or reduce the trapping of cigarette grain and regeneration effect. But, because the increase of exhaust back pressure can be caused by the high ash content load after the high soot load before regeneration or regeneration, so in one example, the application provides the method for two kinds of reasons of a kind of back pressure for distinguishing increase carried out by the controller of Controlling System together with a kind of method in space for ejecting water between PF and TWC based on this differentiation.

Fig. 1 is the schematic diagram of the cylinder illustrated in multicylinder engine 10, and this engine 10 can be included in the propulsion system of automobile. By comprise controller 12 Controlling System and by from the input of vehicle operator 132 via input unit 130, engine 10 can be controlled at least in part. In this example, input unit 130 can comprise accelerator pedal and the pedal position sensor 134 for generation of proportional pedal position signal PP. The combustion chamber (that is, cylinder) 30 of engine 10 can comprise the combustion chamber wall 32 being wherein positioned with piston 36. In certain embodiments, the face of the piston 36 in cylinder 30 can have bowl-shape. Piston 36 can be connected to bent axle 40 so that the convert reciprocating motion of piston becomes the rotary motion of bent axle. Bent axle 40 can be coupled at least one driving wheel of vehicle via intermediate conveyor system. Further, starting motor can be coupled to bent axle 40 via flywheel, to enable the starting operation of engine 10.

Combustion chamber 30 can receive the inlet air from intake manifold 44 via induction trunk 42, and discharges combustion gases via exhaust-duct 48. Intake manifold 44 optionally can be connected with combustion chamber 30 with blast gate 54 via corresponding inlet valve 52 with exhaust-duct 48. In certain embodiments, combustion chamber 30 can comprise two or more inlet valves and/or two or more blast gates.

Inlet valve 52 controls via electric air valve actuator (EVA) 51 by controller 12. Similarly, blast gate 54 by controller 12 via EVA53 control. Can selection of land, variable valve actuator can be electric hydaulic mechanism or any other mechanism that can expect, to allow valve actuation. During some situations, controller 12 can change the signal being provided to actuator 51 and 53, to control the open and close of corresponding inlet valve and blast gate. The position of inlet valve 52 and blast gate 54 can be determined by valve position sensor 55 and 57 respectively. In an alternative embodiment, one or more in inlet valve and blast gate can be cam-actuated by one or more, and one or more that can utilize in cam profile switch system (CPS), variable cam timing (VCT), Variable Valve Time (VVT) and/or lift range variable (VVL) system changes valve operation. Such as, cylinder 30 alternately comprises the inlet valve via electric air valve actuation control and the blast gate via the cam-actuated control comprising CPS and/or VCT.

Fuel injector 66 is illustrated and is directly connected to combustion chamber 30, and for injecting fuel directly in combustion chamber, the injection of described fuel is proportional to the pulse width of the signal FPW received from controller 12 via electronic driver 68. By this way, the fuel being called directly injection is provided in combustion chamber 30 by fuel injector 66. Such as, fuel injector can be installed in the side of combustion chamber or the top of combustion chamber. Fuel is transported to fuel injector 66 by comprising the fuel system (not shown) of fuel container, petrolift and fuel rail.

Under selected operator scheme, response carrys out the spark advance signal SA of self-controller 12, and ignition system 88 can provide pilot spark via sparking plug 92 to combustion chamber 30.

Induction trunk 42 can comprise the butterfly 62 and 63 respectively with throttle plate 64 and 65. In this concrete example, the position of throttle plate 64 and 65 changes via the signal being provided to electronic motor or the actuator being included in butterfly 62 and 63 by controller 12, and this is commonly referred to as the configuration of Electronic Throttle Control (ETC). By this way, butterfly 62 and 63 can be operated to change the inlet air of the combustion chamber 30 being provided in other engine cylinders. The position of throttle plate 64 and 65 can be provided to controller 12 by throttle position signal TP. Induction trunk 42 can comprise mass air flow sensor 120 and the manifold air pressure sensor 122 for corresponding signal MAF and MAP is provided to controller 12.

Further, in the disclosed embodiment, exhaust follows bad (EGR) system again and via high pressure EGR (HP-EGR) passage 140 or low pressure EGR (LP-EGR) passage 150, the exhaust of the expectation part from exhaust-duct 48 can be sent to induction trunk 44. Change, via HP-EGR valve 142 or LP-EGR valve 152, the EGR amount being provided to induction trunk 44 by controller 12. Further, EGR sensor 144 can be arranged in HP-EGR passage, and can provide the instruction of the one in the pressure of exhaust, temperature and concentration or more person.Can selection of land, it is possible to by the value control EGR calculated based on the signal from maf sensor (upstream), MAP (intake manifold), MAT (manifold gases temperature) and crankshaft speed sensor. Further, EGR can be controlled based on exhaust gas oxygen sensor and/or air inlet oxygen sensor (intake manifold). In some cases, egr system can be used for the temperature of air and the fuel mixture adjusted in combustion chamber. Fig. 1 illustrates high pressure egr system and low pressure EGR system, in high pressure egr system, EGR is sent to the downstream of the compressor of turbo-supercharger from the upstream of the turbine of turbo-supercharger, and in low pressure EGR system, EGR is sent to the upstream of the compressor of turbo-supercharger from the downstream of the turbine of turbo-supercharger. In certain embodiments, engine 10 can only comprise HP-EGR system or only comprise LP-EGR system. In a further embodiment, engine 10 can not comprise turbo-supercharger.

So, engine 10 also can comprise the compression device of such as turbo-supercharger or mechanical supercharger, and this compression device at least comprises the compressor 162 arranged along intake manifold 44. Such as, for turbo-supercharger, compressor 162 can be driven by the turbine 164 (via axle) arranged along exhaust-duct 48 at least in part. For mechanical supercharger, compressor 162 can be driven by engine and/or motor at least in part, and can not comprise turbine. Therefore, the draught of one or more cylinder being provided to engine via turbo-supercharger or mechanical supercharger changes by controller 12. Further, turbine 164 can comprise exhaust valve 166, to adjust the supercharging pressure of turbo-supercharger. Similarly, intake manifold 44 can comprise the bypass 167 that valve is housed, to transmit air around compressor 162.

Emission control system 71 and 72 is illustrated the exhaust-duct 48 along exhaust sensor 126 downstream and arranges. Device 71 and 72 can be SCR (SCR) system, three-way catalyst (TWC), NO_XTrap, other emission control systems various or their combination. In the example depicted in fig. 1, device 71 is TWC, and device 72 is particulate filter (PF). In certain embodiments, TWC71 and PF72 can be accommodated in the public housing of emission control system 74 (as shown in Figure 1), and separates via air gap. In alternative embodiments, emission control systems housing 74 can save, and TWC and PF is accommodated in housing separately separately and fluidly connects (not shown in figure 1) via exhaust-duct. Further, in certain embodiments, between the working life of engine 10, emission control equipment 71 and 72 can be reset periodically in accordance to the predetermined mapping methodology by operating at least one cylinder of engine in specific air-fuel ratio.

Exhaust sensor 126 is illustrated the exhaust-duct 48 being connected to emission control system 74 upstream. Further, sensor 127 is illustrated the exhaust-duct 48 being connected between particulate filter 72 and three-way catalyst 71 via the salient (boss) 76 being arranged in emission control system 74. Sensor 128 is illustrated the exhaust-duct 48 being connected to particulate filter 72 downstream. Sensor 127 and 128 can measure the exhaust pressure of particulate filter 72 upstream and downstream, to determine the pressure drop (being also referred to as exhaust Δ (delta) pressure) of particulate filter both sides. Such as, if exhaust Δ pressure is greater than threshold value exhaust Δ pressure, then it can indicate particulate matter (cigarette grain) and/or ash content to accumulate to the sufficiently high degree being enough to hinder the expectation evacuation circuit through particulate filter on particulate filter.In response to the big pressure drop of particulate filter both sides, the particulate filter regeneration burning particulate matter can be performed and/or remove the jet of water of the ash content assembled, as described in more detail below. In alternative embodiments, sensor 128 can not be comprised, and sensor 127 can be absolute pressure sensor or gauge pressure sensor.

Three-way catalyst comprises the porous substrate being coated with one or more of precious metal. Three-way catalyst is configured to the one or more of discharges transforming in the exhaust flowing through three-way catalyst. Particulate filter comprises reticulated structure. In some instances, particulate filter can comprise one or more of precious metal, and wherein the precious metal quality of particulate filter is less than the precious metal quality of three-way catalyst. Exemplarily, if three-way catalyst comprises the precious metal of 100g, then particulate filter can comprise the precious metal of 25g. In some instances, quaternary catalytic device can be used to replace three-way catalyst, the particulate filter that quaternary catalytic device can comprise with three-way catalyst is integrated. Particulate filter is configured to the cigarette grain trapping in the exhaust flowing through particulate filter.

In one example, reservoir 70 can store water. In other examples, reservoir 70 can store another kind of suitable fluid or fluid mixture (such as, water and methanol/ethanol/ethylene glycol), to reduce the freezing point of water. The air gap that reservoir 70 fluid is connected between TWC71 and PF72 by pipeline 75 and water-jet exhauster 73. The salient 76 of hold pressure unit 127 also can hold water-jet exhauster 73, and wherein injector is positioned between TWC and PF to spray water. In alternative embodiments, the salient separated can be used for holding water-jet exhauster 73 and pressure transmitter 127. Such as, water-jet exhauster can be controlled via the signal sent from controller (controller 12). Such as, the jet of water in air gap between TWC71 and PF72 can be greater than threshold pressure (pressure transmitter 127 measure exhaust pressure be greater than threshold value exhaust pressure) in response to pressure transmitter measurement. Jet of water also can be greater than threshold value regeneration temperature in response to PF regeneration temperature.

Controller 12 is illustrated as minicomputer in FIG, comprising: micro-reason device unit (CPU) 102, input/output end port (I/O) 104, in this particular example, be illustrated as read-only storage (ROM) 106 for can the electronic storage medium of steering routine and calibration value, random access memory (RAM) 108, keep-alive storer (KAM) 110 and data bus. Controller 12 can receive the various signals from the sensor being connected to engine 10, except those signals previously discussed, also comprises: from the measurement of air inlet quality air flow (MAF) of mass air flow sensor 120; From the engine cool liquid temp (ECT) of the temperature sensor 112 being connected to cooling cover 114; From the profile ignition pickup signal (PIP) of the Hall effect sensor 118 (or other types) being connected to bent axle 40; From the butterfly position (TP) of throttle position sensor; And carry out the absolute Manifold Pressure Signal MAP of sensor 122. Engine rotational speed signal RPM can be generated according to signal PIP by controller 12. Manifold pressure signal MAP from manifold pressure sensor can be used for the instruction of vacuum or the pressure being provided in intake manifold. Note using the various combinations of the sensor, such as maf sensor and there is no MAP sensor, or vice versa. During stoichiometric operation, MAP sensor can provide the instruction of engine moment of torsion.Further, this sensor can provide the estimation of the inflation (comprising air) being introduced in cylinder together with detected motor speed. In one example, it is possible to as motor speed sensor sensor 118 can bent axle often change the line of production raw predetermined number wait spacing pulse.

Storage media read-only storage 106 can with the mechanized data programming representing the instruction that can perform by treater 102, this instruction for performing following method and expection but other variants specifically do not listed.

As mentioned above, it is necessary, Fig. 1 only illustrates a cylinder of multicylinder engine, and each cylinder can comprise the inlet valve/blast gate of himself group, fuel injector, sparking plug etc. similarly.

As previously mentioned, water extraction is fed between TWC71 and PF72 by injector 73. The method can be used for reducing near the ash content load on the PF surface of TWC. The function of this system is determined by controller 12 and is described further in fig. 2.

Fig. 2 be illustrate a kind of for regeneration of particle filters and between TWC and PF, spray the schema of the illustrative methods of water, the method can be performed by the Controlling System comprising controller that other hardware componenies with one or more sensor, one or more actuator and/or one or more all engine exhaust system as described are combined and treater. The part of action described in Fig. 2 program can structurally be formed as the instruction being stored in non-transitory memory.

With continued reference to Fig. 2, jet of water can reduce near the ash content load on the PF surface in the space between TWC and PF, or reduces PF temperature to prevent PF from deteriorating. Such as, in some instances, ash content can accumulate on PF in the region closer to TWC or more upstream. As mentioned above, it is necessary, the injection between TWC and PF can comprise water. Such as, in some instances, injection can also complete with fluid mixture (water and methanol/ethanol/ethylene glycol). This mixture can at water otherwise by (such as, engine cold starting) injected when freezing, as determined by controller.

The parts described with reference to Fig. 1 herein and system, particularly about TWC71, PF72, reservoir of water 70, water-jet exhauster 73, pressure transmitter 127 and 128, emission control system 74, turbine 164, exhaust valve 166 and exhaust-duct 48 described method 200. Such as, method 200 can be passed through controller (controller 12) and carry out according to the computer-readable medium being stored thereon. In some instances, method 200 can perform in spark ignition engine, and so the method the term of execution, the fuel in engine can via spark ignition combustion, and the exhaust carrying out since engine may be directed to particulate filter. It is to be understood that without departing from the scope of the disclosure, method 200 can be applicable to other systems of different configuration.

Method 200 from 202, wherein can be estimated and/or measure engine behaviour. Engine behaviour can include but not limited to the air-fuel ratio of exhaust temperature, engine load and rotating speed, exhaust pressure and order. At 204 places, the method comprises the exhaust pressure measured between TWC and PF. In one example, except injector 75, between pressure transmitter in the upstream direction and TWC and between downstream side pressure transmitter upwards and PF, there are not other parts. In other examples, if needed, it is possible to add additional parts. In some instances, wherein TWC and PF is contained in public housing, can measure exhaust pressure in the air gap place in the housing between TWC and PF.In other examples, wherein TWC and PF is accommodated in the housing separated via exhaust-duct connection, and exhaust pressure can be measured by the exhaust-duct place between TWC and PF. Exhaust pressure can by gauge pressure sensor or absolute pressure force sensor measuring. Such as, the pressure transmitter 127 held via the salient in the housing between TWC and PF can measure the exhaust pressure in air gap, as illustrated by above with reference to Fig. 1. As another example, emission control system 74 can hold Δ pressure transmitter 127 and 128, and wherein the exhaust pressure in air gap measured by pressure transmitter 127, and the exhaust pressure in PF downstream measured by pressure transmitter 128, as illustrated by above with reference to Fig. 1.

At 206 places, the method comprises the exhaust pressure between by TWC and PF compared with the first threshold value exhaust pressure. First threshold value exhaust pressure can be the suitable pressure that the instruction cigarette grain of relative high levels and/or ash content have accumulated on PF. Such as, the soot load being greater than threshold value soot load can hinder evacuation circuit to pass PF. In one example, if exhaust pressure is by gauge pressure sensor/absolute pressure force sensor measuring, then the first threshold value exhaust pressure can be first threshold value table pressure sensor/absolute pressure cell pressure. In another example, if Δ exhaust pressure is measured by upstream pressure sensor and downstream pressure sensor, then the first threshold value exhaust pressure can be the first threshold value Δ exhaust pressure. If exhaust pressure is greater than the first threshold value exhaust pressure, then the method advances to 210, and it will illustrate in greater detail hereinafter. Briefly, as mentioned above, it is necessary, be greater than threshold value due to soot load and/or ash content load, exhaust pressure can be greater than the first threshold value exhaust pressure, and therefore can carry out PF and regenerate to burn the cigarette grain gathered. This PF regeneration requirements can exceed threshold value soot load based on the soot load on PF. On the other hand, if exhaust pressure is less than the first threshold value exhaust pressure, then the method advances to 208. At 208 places, the method comprises and keeps present engine operating parameters and do not carry out PF regeneration. The method can exit.

At 210 places, the method comprises and determines whether to meet regeneration condition. PF regeneration can be passive or active. Such as, if regeneration is passive, then regeneration condition can comprise car speed and exceed threshold value car speed (40mph) and/or engine load exceedes threshold engine load. If not meeting passive regeneration condition, then the method advances to 208. At 208 places, as mentioned above, it is necessary, the method comprises keeps present engine operating parameters. The method can return to continue to monitor the condition being applicable to performing regeneration.

If regeneration is initiatively, then engine operation parameters can regulate exhaust temperature is increased to the sufficiently high temperature being enough to initiate the burning of cigarette grain stored on PF with being deliberated. Such as, the engine operation parameters of alterable can comprise the oxygen level in increase inlet air and/or exhaust (by regulating butterfly position), postpone spark and delay fuel to spray the one in timing or more person. In some instances, in fact regeneration can only be carried out when causing sufficiently high exhaust temperature to perform regeneration when current operation parameter allows above-mentioned listed change and/or in this type of change. Such as, regeneration can not be performed during engine cold starting. If not meeting initiative regeneration parameter, then the method advances to 208.Further, when meeting initiative regeneration operating mode, can regenerate during the successive iterations of method 200. Such as, in alternative embodiments, controller (controller 12) can regulate and occur and no matter present engine operating parameters is how by signaling initiative regeneration. At 208 places, the method comprises and keeps present engine operating parameters as above. The method can exit.

If meeting passive regeneration operating mode or initiative regeneration operating mode, then the method advances to 212, performs regeneration at 212 places. Between regeneration period, air-fuel ratio can be rare, and spark can postpone, and/or fuel injection can delay, to increase exhaust temperature. Hotter rare exhaust can allow the cigarette grain stored by PF burning and make stored cigarette grain spontaneous combustion. Therefore, if exhaust gas oxygen and temperature increase, then PF makes cigarette grain spontaneous combustion and regeneration more fast. At regeneration conditions, for given exhaust temperature, the total duration of regeneration can based on the total soot load being stored on PF. Can based on such as difference between exhaust pressure and the first threshold value exhaust pressure or estimate the total soot load on PF based on engine operation parameters after having occurred from previous PF regeneration. The soot load that exhaust pressure is greater than on the first threshold value exhaust pressure instruction PF regeneration requirements and PF is greater than threshold value soot load. Such as, therefore, when the difference between exhaust pressure and the first threshold value exhaust pressure increases, the soot load of the upper estimation of PF increases (soot load of increase hinders evacuation circuit to pass PF and add exhaust back pressure further). Therefore, when estimated soot load increases and/or exhaust temperature reduces, the total duration of regeneration increases. Further, when estimated soot load reduces and/or exhaust temperature increases, the total duration of regeneration reduces.

But, due to the change of engine operation parameters, regeneration can stop. As the example of passive regeneration, owing to engine load is less than threshold load, this regeneration can stop and/or interrupting. When the engine load decreases, air-fuel ratio becomes denseer, and therefore, PF spontaneous combustion does not receive to be enough to make spontaneous combustion keep a certain amount of oxygen initiatively. Such as, therefore, PF regeneration can be occurred to be the situation (regeneration is interrupted) that incomplete PF regenerates.

At 214 places, the method comprises determines whether PF regeneration is completely. PF regeneration completely based on making regeneration operating reach the predetermined time period (such as, 10 minutes), can reach PF regeneration temperature (such as, 800 DEG C), make soot load reduce to relatively low load or the combination of this three. If it is determined that regeneration is incomplete, then the method advances to 216. Such as, at 216 places, based on above-mentioned operating mode, the method comprises determines whether regeneration is interrupted (engine load drops to lower than threshold engine load). If regeneration is not interrupted, then the method advances to 212 and continues to perform regeneration.

But, if if regeneration is completely or regenerates interruption, then the method advances to 218. At 218 places, the method comprises the exhaust pressure measuring (e.g., at air gap place) between TWC and PF, and it is similar to above with reference to the process described in 204, to estimate near the ash content load on the PF surface in the space between TWC and PF. Such as, as discussed previously, when exhaust flow passes emission control system (such as, emission control system 74), cigarette grain is stored on PF (PF72). Such as, cigarette grain can block the evacuation circuit through PF, and forms exhaust back pressure (exhaust pressure that PF upstream increases).Such as, in response to being greater than the first threshold value exhaust pressure by exhaust pressure and the back pressure of the increase of signaling, controller (controller 12) can signaling regeneration. When performing regeneration, cigarette grain is combusted into ash content, and ash content can accumulate in upstream PF on the surface. When ash content gathers with some PF regeneration (such as, 100), ash content load can fully increase, to cause exhaust back pressure. Therefore, exhaust pressure measurement can be used for detection regeneration requirements or jet of water requirement, and this depends on when inquire about discharge pressure signal. Therefore, before regeneration event and immediately exhaust pressure can be measured after PF regenerates, to determine that whether back pressure is that soot load is greater than threshold value soot load or ash content load is greater than the result of threshold value ash content load. As used herein, term " immediately " can be included in determine to regenerate complete or interrupt after but start the suitable time length before assembling on PF at cigarette grain, such as in 5 minutes of PF regeneration or less.

At 220 places, measured exhaust pressure compares with Second Threshold exhaust pressure. In an embodiment, Second Threshold exhaust pressure can equal the first threshold value exhaust pressure. In a second embodiment, Second Threshold exhaust pressure can based on the exhaust pressure of expection. The exhaust pressure of expection can regenerate based on previous PF. Such as, if PF regeneration is interrupted, then the exhaust pressure expected can higher than the exhaust pressure of the expection regenerated for PF completely. Furthermore it is contemplated that exhaust pressure can based on PF regeneration temperature and/or PF regeneration duration. In other words, when PF regeneration duration and/or temperature increase, it is contemplated that exhaust pressure reduce. If exhaust pressure is less than Second Threshold exhaust pressure, then ash content load is not more than threshold value ash content load, and jet of water does not occur. The method advances to 208, and keeps present engine operating parameters as above. The method can exit.

If the exhaust pressure observed value after PF regeneration is greater than Second Threshold exhaust pressure, then ash content load can be greater than threshold value ash content load, and causes pressure to reflux. The method advances to 222.

Ash content load is greater than threshold value ash content load, and by hindering, evacuation circuit causes exhaust pressure to be greater than Second Threshold exhaust pressure through PF, and therefore ash content load exceedes threshold value ash content load and can determine by controller based on only measuring in the exhaust pressure that occurs of place of selected time as mentioned above. In other examples, after the PF of pre-determined quantity (such as, 100) regenerates, ash content load can be predicted to be and be greater than threshold value ash content load. Further, in some instances, ash content load can be estimated as based on estimated ash content load generation (production) and exceed threshold value. Estimated ash content load produces can based on the PF soot load estimated by before regeneration and PF regeneration temperature and PF regeneration duration. Estimated ash content load produces the soot load along with estimated burning to be increased and increase. The ash content load predicted can increase along with estimated soot load, PF regeneration temperature increases and/or PF regeneration duration increase in one or more person and increase.

Such as, exemplarily, vehicle can start PF regeneration in response to the high soot load (0.5kg) on PF. Such as, the adjustable operating parameters of vehicle to be increased to PF regeneration temperature (650 DEG C) by exhaust temperature. But, PF regeneration can be interrupted, and therefore this regeneration can be incomplete. Vehicle can estimate the cigarette grain amount burnt based on regeneration temperature and time length. ?oat of throbbing with fear all sends bright Qi ? ? such as together with ?, the cigarette grain of 0.2kg stops on PF) and the cigarette grain that burns all does not change into ash content (such as, the cigarette grain of 0.5kg burning changes into the ash content of 0.05kg), transforming agent can be used for estimating the new ash content load formed (such as based on regeneration condition, the cigarette grain of incendivity 0.3kg, thus cause the ash content of 0.03kg). Ash content load can be passed in time and increase (such as, after each regeneration event), so that when the next jet of water allowing controller prediction to reduce ash content load can occur.

At 222 places, the method comprises and determines whether to meet jet of water condition. Such as, based on the temperature survey in reservoir of water (reservoir 70) or cubing, jet of water condition can comprise determines whether water is available. Such as, temperature survey can be used for determining that water is liquid phase water or freeze water (ice). By suitable meter, cubing can show that volume sensor carries out and can be used for determining whether there is enough water for injection. Further, jet of water condition also can comprise measurement exhaust temperature. Such as, exemplarily, it is preferred that be less than the condition of threshold value exhaust temperature (100 DEG C) in exhaust temperature during, spray water. The injection that exhaust temperature is less than threshold value exhaust temperature allows water to remain liquid phase, and the ash content from the PF surface near TWC is washed into PF end. If exhaust temperature is greater than threshold value exhaust temperature, then water can evaporate when spraying and can not reduce ash content load. If not meeting jet of water condition, then the method advances to 224. At 224 places, the method comprises continuation monitoring nozzle parameter, until meeting jet of water condition.

If meeting injection condition, then the method advances to 226 and sprays water. Exemplarily, jet of water time length and/or volume can based on above-mentioned estimated ash content Load Regulation, and wherein when estimated ash content load increases, jet of water time length and/or volume also can increase. Such as, as another example, the ash content load that no matter estimated jet of water time length and/or volume can be based on the concrete time length (30 seconds) of injection how. In one example, jet of water can based on preset value, and no matter estimated ash content load how, and wherein ash content load is reduced to relatively low amount and reduces exhaust back pressure by jet of water. In another example, jet of water can perform with predetermined jet of water speed such as 5kg/hr. The ash content gathered in PF upstream face can be washed into PF rear portion and finally be washed in air by jet of water. The method advances to 228.

At 228 places, the method comprises and optionally regulates present engine operating parameters to increase the exhaust quality stream through PF, thus assists in removing ash content. In an embodiment, wherein TWC is in the downstream of LP-EGR system, and this adjustment can comprise opens exhaust valve and/or partially or completely closed EGR valve, to make elevated pressures and/or more exhaust flow through TWC and PF. But, this performs when meeting engine dilution and require only, such as to keep the exhaust emission levels expected. By reducing EGR flow rate, the possibility removing ash content from PF rear portion can increase. Then the method can exit.

Fig. 2 depicts a kind of PF of regeneration and sprays water between TWC and PF to reduce the illustrative methods near the ash content load on the PF surface in the space between TWC and PF. Fig. 3 is existing sprays water to keep PF temperature and/or to reduce the method near the ash content load on the PF surface in the space between TWC and PF by a kind of for description.In one example, the program of Fig. 3 can be combined execution with the program of Fig. 2.

Fig. 3 illustrates that one for spraying the schema of the illustrative methods 300 of water between particulate filter (PF) and three-way catalyst (TWC), and wherein PF is in the downstream of TWC.

The parts described with reference to Fig. 1 herein and system, particularly about TWC71, PF72, reservoir of water 70, water-jet exhauster 73, pressure transmitter 127 and 128 and emission control system 74 described method 300. Such as, method 300 can be passed through controller (controller 12) and carry out according to the computer-readable medium being stored thereon. It is to be understood that without departing from the scope of the disclosure, method 300 can be applicable to other systems of different configuration.

Method 300 from 302 places, can be estimated at 302 places and/or measure engine behaviour. Engine behaviour can include but not limited to the air-fuel ratio of exhaust temperature, engine load and/or rotating speed, exhaust pressure and order. At 304 places, method 300 comprises estimates whether PF temperature exceedes threshold value PF temperature. Such as, PF temperature is greater than the deterioration that threshold value PF temperature (higher than the temperature of 1000 DEG C) can cause PF irreversible. In one example, PF temperature directly can be measured by temperature sensor, or it can be inferred according to the operating mode of the soot load etc. on such as exhaust temperature, air-fuel ratio, PF. Threshold value PF temperature can higher than in usual the reached temperature of regeneration event period PF. If PF temperature is greater than threshold value PF temperature, then the method advances to will be described hereinafter 310. But, if PF temperature is less than threshold value PF temperature, then the method advances to 306.

At 306 places, the method comprise by near the ash content load on the PF surface in the space between TWC and PF compared with threshold value ash content load. As mentioned above, it is necessary, can produce to estimate ash content load based on estimated ash content load. Determine that ash content load comprises and measure the exhaust pressure in air gap via pressure transmitter, and measured exhaust pressure is compared with Second Threshold exhaust pressure. As mentioned above, it is necessary, pressure transmitter can be gauge pressure sensor, absolute pressure sensor or Δ pressure transmitter. If measured exhaust pressure is greater than Second Threshold exhaust pressure, then ash content load can be greater than threshold value ash content load.

Such as, such as, in alternative embodiments, it is determined that ash content load is greater than threshold value ash content load can based on the mileage (1000 miles) having travelled with threshold velocity (more than the 40mph of 100 hours) or just having travelled in certain time section.

If ash content load is greater than threshold value ash content load, then the method advances to 310. If ash content load is less than threshold value ash content load, then the method advances to 308. At 308 places, the method comprises and keeps present engine operating parameters, and fluid jet does not occur. The method can exit.

At 310 places, the method comprises and determines whether satisfied injection condition. Such as, injection condition can comprise the operability (there is enough water in reservoir or water is liquid) of water as above. If reservoir does not have the water of enough volumes for injection, then this reservoir can supplement via external service port. In alternative embodiments, reservoir can supplement via the condensation product formed in charge air cooler. Charge air cooler can be connected to reservoir of water by fluid, and wherein condensation product from charge air cooler flow to reservoir of water in response to the fluid volume meter in reservoir. Further, in certain embodiments, air regulator dropper can be connected to reservoir of water by fluid, and wherein condensation product from air regulator flow to reservoir of water in response to the fluid volume meter in reservoir. If meeting jet of water condition, then the method advances to 314.But, if not meeting described condition, then the method advances to 312, and controller keeps present engine operating parameters (as described in reference to 308).

Such as, at 314 places, the method comprises in the space (air gap or exhaust-duct) ejecting water between TWC and PF. This injection in response to pressure signal higher than threshold pressure, as mentioned above. Further, injection can in response to micro particle filtering actuator temperature higher than threshold temperature. Jet of water impacts the front surface of PF and ash content is washed into the rear portion of PF. Then ash content is blown out PF and enters in air through vapor pipe by exhaust.

Unexpected ground, jet of water makes PF catch the maximized of more thickness grain. This may be owing to water is that PF provides caused by the adhesive surface area of increase. Further, water can provide NO due to its polarity with to the bonding ability of gas_xWith catching of the raising of CO. As mentioned above, it is necessary, the amount of the water sprayed can be determined based on estimated ash content load. The method advances to 316.

At 316 places, the method comprises and regulates engine parameter in response to jet of water. This can include but not limited to only reduce EGR flow rate (as mentioned above) when meeting engine dilution and require. The method can exit.

Fig. 3 shows a kind of for utilizing jet of water keep PF temperature or reduce the illustrative methods near the ash content load on the PF surface in the space between TWC and PF. Existing the illustrating with chart of Fig. 4 regenerates at PF and causes the condition during the event of jet of water.

Fig. 4 illustrates the graphic representation 400 of the various engine condition affecting jet of water. It is to be understood that the example presented in Fig. 4 is exemplary in essence, and other results are possible. Such as, in addition or the engine parameter substituted can affect the generation of regeneration. PF temperature is saved from Fig. 4.

Such as, Fig. 4 represents the example of initiative regeneration, and its middle controller adjustable engine parameter is to initiate PF regeneration (engine operates under rare state, delays fuel injection and/or postpone spark). But, in alternative embodiments, regeneration can be only passive, be only on one's own initiative or their combination. If regeneration be passive, then controller can not signaling initiate passive PF regenerate adjustment.

The engine control of the various operating parameters of the graphical representation in Fig. 4 and gained, for reducing near the ash content load on the PF surface in the space between TWC and PF via the jet of water in the space between TWC and PF. X-axis line represents the time, and y-axis line represents shown corresponding engine condition. On graphic representation 400, curve 402 represents soot load, curve 404 represents exhaust temperature and straight line 405 represents the minimum threshold value exhaust temperature starting PF regeneration, curve 406 represents exhaust pressure and straight line 408 represents threshold value exhaust pressure, curve 410 represents ash content load and straight line 411 represents threshold value ash content load, and curve 412 represents jet of water. In the example depicted in fig. 4, threshold value exhaust pressure 408 represents the first threshold value exhaust pressure and Second Threshold exhaust pressure, and wherein Second Threshold exhaust pressure equals the first threshold value exhaust pressure.

Parts and system, particularly reservoir of water 70, pipeline/water-jet exhauster 73, TWC71, PF72, exhaust pressure sensor 127 and 128 and the exhaust after treatment system 74 described with reference to Fig. 1 herein describe graphic representation 400. Such as, by controller (controller 12) according to parameter illustrated in the computer-readable medium experiment curv Figure 40 0 stored on it.

Before T1, soot load increases, as with reference to curve 402 finding. Along with cigarette grain gathers on PF, exhaust pressure increases, as shown in curve 406. Due to the engine load increased, soot load can increase gradually, and therefore exhaust temperature increases, as shown in reference to curve 404. When not having new cigarette grain to be regenerated as ash content, ash content load keep constant and lower than threshold value ash content load, as shown in curve 410. Jet of water keeps forbidding, as shown in curve 412.

At T1 place, exhaust pressure is increased to threshold value exhaust pressure, and therefore controller can start the adjustment that signaling starts PF regeneration. Due to controller signaling start regeneration adjustment (such as, increase air inlet, delay fuel injection and/or postpone spark), exhaust temperature be greater than start PF regeneration minimum threshold value exhaust temperature. After tl and before T2, exhaust temperature continues increase and exceeds minimum threshold value exhaust temperature. Such as, minimum threshold value regeneration exhaust temperature can based on threshold value PF regeneration temperature (600 DEG C). As mentioned above, it is necessary, PF regenerates the time length that effect can be depending on exhaust temperature, soot load and/or regeneration. Such as, further, the time length of regeneration can based on soot load, exhaust temperature and/or engine parameter (motor speed, engine load, engine temperature etc.). Exemplarily, for given soot load, the time length of regeneration and exhaust temperature are reversible relevant, and wherein along with exhaust temperature increases, the time length of regeneration reduces.

Soot load remains height until exhaust temperature is increased to relatively high temperature. Such as, such as, high exhaust temperature (900 DEG C) is the temperature higher than low exhaust temperature (550 DEG C). Exhaust pressure is reduced to the pressure lower than threshold value exhaust pressure. But, regeneration duration can based on the calculating comprising regeneration temperature as above and soot load, soot load to reduce to relatively low amount, wherein regeneration duration is unrelated with exhaust pressure. Such as, exhaust temperature reduces along with soot load and starts to reduce, to improve fuel economy (air-fuel ratio is back to stoichiometric ratio, fuel injection timing does not delay and/or spark no longer postpones). Once PF has reached threshold value PF regeneration temperature, its just can spontaneous combustion and no longer need exhaust temperature be greater than start PF regeneration minimum threshold value exhaust temperature. When cigarette grain changes into ash content, ash content load increases in the time span of regeneration. Because cigarette grain is not 1:1 (such as, burning cigarette grain produces gas particles) to the conversion of ash content, so the speed that ash content load increases is not equal to the speed that soot load reduces. The new ash content load formed is not higher than threshold value ash content load, and therefore exhaust pressure keeps below threshold value exhaust pressure. Therefore, jet of water keeps forbidding.

At T2 place, PF regeneration ending and soot load is low. Exhaust temperature reduces. Exhaust pressure keeps below threshold value exhaust pressure. Ash content load keeps below threshold value ash content load, and therefore, jet of water keeps forbidding. After t 2 and before T3, exhaust pressure increases along with the soot load on PF and increases. As mentioned above, it is necessary, due to the non-regeneration ash content of cigarette grain, ash content load keeps constant. Exhaust temperature starts to increase, and jet of water keeps forbidding.

At T3 place, due to the soot load increased, exhaust pressure is increased to the pressure being greater than threshold value exhaust pressure. Therefore, controller signaling increases regeneration adjustment (as mentioned above) of exhaust temperature.Owing to soot load not yet changes into ash content, ash content load keep constant and lower than threshold value ash content load. At T3 place and before T4, exhaust temperature is increased to the temperature being substantially equal to start the minimum threshold value exhaust temperature (such as, 600 DEG C) of PF regeneration, and remains in this temperature. Therefore, PF regeneration duration is greater than above-mentioned PF regeneration duration. Such as, this can be caused by relatively low exhaust temperature (compared with 900 DEG C 600 DEG C). Relatively PF can not be heated to expectation regeneration temperature as higher exhaust gas temperature by low exhaust temperature so fast. Therefore, regeneration can spend longer for some time. Further, due to longer regeneration, the accumulation rate of ash content load reduces. After certain time length, exhaust temperature starts to reduce, but, regeneration is continued until that soot load is low (as mentioned above).

At T4 place, regeneration is completely and soot load is relatively low. Exhaust temperature is reduced to relatively low temperature. Exhaust pressure has been reduced to the pressure lower than threshold value exhaust pressure. But, due to the ash content load increased in cyclic regeneration process, the reduction that the reduction of exhaust pressure is less than in previously regeneration. But, ash content load keeps below threshold value ash content load, and jet of water is forbidden. After T4 and before T5, exhaust pressure increases due to the soot load of increase on PF. Exhaust temperature continues to reduce. Ash content load keep constant and lower than threshold value ash content load. Therefore, jet of water keeps forbidding.

At T5 place, exhaust pressure reaches threshold value exhaust pressure. It is more than or equal to threshold value exhaust pressure, as mentioned above, it is necessary, controller signaling carries out the adjustment of PF regeneration in response to exhaust pressure. The adjustment of signaling can make exhaust temperature increase. Such as, exhaust temperature is increased to the temperature being greater than nominal exhaust temperature (550 DEG C). Exhaust pressure continues to increase. Owing to soot load does not get transformed into ash content, ash content load does not increase. Jet of water keeps forbidding. Aftert and before T6, exhaust temperature is increased to the minimum threshold value exhaust temperature being greater than and starting PF regeneration. Such as, such as, in this example, exhaust temperature can be less than the first regeneration temperature (between T1 and T2) and be greater than the 2nd regeneration temperature (between T3 and T4). Therefore, regeneration duration that regeneration duration between T5 and T6 is greater than between T1 and T2 and the regeneration duration that is less than between T3 and T4. Once PF reaches threshold value PF regeneration temperature, soot load just starts to reduce. Along with soot load reduces, exhaust pressure reduces and ash content load increases. But, ash content load is increased to the ash content load being greater than threshold value ash content load, and therefore, no matter how PF regenerates, and exhaust pressure can not drop to lower than threshold value exhaust pressure. As mentioned above, it is necessary, regeneration is continued until the load that cigarette grain reaches relatively low.

At T6 place, regeneration is forbidden and soot load is relatively low. Exhaust temperature returns nominal exhaust temperature. Owing to ash content load is relatively high, the exhaust pressure between TWC and PF keeps being greater than threshold value exhaust pressure. In other words, it is greater than threshold value exhaust pressure in response to exhaust pressure, initiates regeneration. But, exhaust pressure be greater than PF regenerate after threshold value exhaust pressure no longer signaling PF regenerate, but, it can be greater than threshold value ash content load by signaling ash content load. Therefore, initiate jet of water. After T6 and before T7, jet of water continues with constant rate of speed within a predetermined period of time.In alternative exemplary, as mentioned above, it is necessary, can based on ash content Load Regulation jet of water speed estimated on PF. Exhaust pressure drops under threshold value exhaust pressure. But, jet of water is continued until that ash content load reduction is to relatively low load. Exhaust temperature remains relatively low temperature. Soot load increases with low rate.

At T7 place, owing to ash content load reaches relatively low load, jet of water of stopping using.

By this way, can reduce at the ash content load gathered on the surface near the PF in the space between the PF strainer in TWC downstream. Further, by increasing the adhesive surface area of PF and the emission gases offer hydrogen bond for specifying, jet of water can strengthen the filtration capacity of PF. The technique effect performing jet of water in space between TWC and PF is to the level lower than threshold value ash content load by the ash content load reduction that gathers in PF regenerative process. Further, jet of water can in response to the PF filter temperature higher than threshold value PF temperature. Jet of water can reduce the PF filter temperature higher than threshold value PF temperature, to prevent PF from deteriorating.

In an embodiment, comprising for the method for engine and be ejected between particulate filter and three-way catalyst by water from reservoir, particulate filter is positioned at three-way catalyst downstream. Additionally or alternati, spray in response to the discharge pressure signal between three-way catalyst and particulate filter higher than threshold pressure. The method also can comprise injection in response to micro particle filtering actuator temperature higher than threshold temperature. Additionally or alternati, spraying the ash content load of the estimation after having completed in response to the regeneration of cigarette grain, the ash content load wherein estimated is based on the exhaust pressure after the regeneration of cigarette grain, and comprises based on estimated ash content Load Regulation jet of water amount.

Additionally or alternati, the method can comprise: the three-way catalyst comprising the porous substrate being coated with one or more of precious metal, three-way catalyst is configured to the one or more of discharges transforming in the exhaust flowing through three-way catalyst, and wherein particulate filter comprises the reticulated structure not having noble coatings, particulate filter is configured to the cigarette grain trapping in the exhaust flowing through gas particulate filter units. Additionally or alternati, in response to the exhaust pressure between three-way catalyst and particulate filter higher than threshold value exhaust pressure, perform the regeneration of cigarette grain.

The embodiment of engine comprises: the engine with multiple cylinder; Engine exhaust emission control system, it comprises the particulate filter being positioned at catalyst brick downstream; Exhaust-duct, enmgine exhaust is connected to engine exhaust emission control system by it; Injector, it is connected to reservoir of water via pipeline fluid, and this injector fluid is connected between catalyst brick and particulate filter; Pressure transmitter, it is connected between catalyst brick and particulate filter; And controller, it has the computer-readable instruction being stored on non-transitory memory, this controller is used for the pressure based on pressure transmitter is measured and estimates the ash content load in particulate filter, and exceedes threshold value ash content load in response to estimated ash content load and spray water via injector. Additionally or alternati, this system can comprise the EGR channel of the exhaust-duct being connected to emission control system upstream, and wherein instruction also comprises the instruction of the injection in response to water for regulating EGR flow rate.

This system also can comprise the three-way catalyst brick and particulate filter being contained in the public housing of emission control system and separate via air gap, and wherein public housing comprises the salient being positioned between three-way catalyst brick and gas particulate filter units, to hold injector, this injector is positioned to eject water in air gap, and wherein salient also can hold injector.Additionally or alternati, this system can comprise in the housing being contained in separately and the three-way catalyst brick that connects via exhaust-duct fluid and particulate filter, and the exhaust-duct that wherein injector is connected between three-way catalyst brick and particulate filter. Additionally or alternati, the ash content level estimated is determined in the regeneration that this system can be included in particulate filter after completing.

Another kind comprises for the method for engine: via the fuel in spark-ignition combustion engine and the in the future exhaust of since engine is directed to particulate filter; In response to the exhaust pressure of particulate filter upstream more than the first threshold pressure, regeneration of particle filters is to remove the particulate matter being stored on particulate filter; And exceed Second Threshold pressure in response to the exhaust pressure of particulate filter upstream after having regenerated, between particulate filter and the three-way catalyst of particulate filter upstream, spray water to remove ash content from particulate filter. Additionally or alternati, the method can be included between three-way catalyst and particulate filter to measure exhaust pressure.

Additionally or alternati, the method can comprise regeneration of particle filters, wherein regeneration comprises and exhaust temperature is increased at least threshold temperature reaches predetermined lasting time, wherein determines exhaust temperature and predetermined lasting time based on the particulate matter load on particulate filter at least partly. Additionally or alternati, the method can comprise when exhaust temperature remained determine when at least threshold temperature reaches predetermined lasting time regeneration complete.

Additionally or alternati, the method can comprise increases exhaust temperature due to the increase of engine load. The method also can comprise the first threshold pressure and be greater than Second Threshold pressure. Additionally or alternati, the method can comprise and ejecting water between three-way catalyst and particulate filter when micro particle filtering actuator temperature exceedes threshold value micro particle filtering actuator temperature.

Noting, the example control comprised herein can use with estimation program together with various engine and/or Vehicular system configuration. Control method disclosed herein and program can be used as and can perform instruction and be stored in non-scratchpad memory, and can be combined implementation by the Controlling System comprising controller with various sensor, actuator and other engine hardware. It is one or more of that specific program as herein described can represent in the processing policy of any number, such as event-driven, drives interrupts, multitask, multi-thread journey etc. So, illustrated various actions, operation and/or function can order illustratively perform, executed in parallel or omit in some cases. Equally, the order of process is not that the feature and advantage realizing exemplary embodiment as herein described must require, but illustrates for being easy to and describe offer. According to the specific strategy used, what can repeat in illustrated action, operation and/or function is one or more of. Further, described action, operation and/or function can graphically to be programmed into the codes in the non-transitory memory of the computer-readable recording medium in enngine control system, and wherein said action is carried out by the instruction performing to comprise in the system of the various engine hardware parts being combined with electronic regulator.

It is to be understood that because many variants are possible, so in fact configuration disclosed herein and program are exemplary, and these specific embodiments should not be regarded as having limited significance. Such as, above-mentioned technology can be applicable to V-6, I-4, I-6, V-12, to putting 4 cylinders and other engine types.Theme of the present disclosure comprises various system disclosed herein and configuration, and all novelties of further feature, function and/or attribute with non-obvious combination and sub-portfolio.

Claim of enclosing particularly point out be regarded as novel in non-obvious some combination and sub-portfolio. These claims can refer to " one " element or " first " element or its equivalent. This type of claim should be understood as that the combination comprising this class component one or more, both two or more these class components neither requiring nor excluding. Other combinations of disclosed feature, function, element and/or character and sub-portfolio are by the amendment of this claim or come claimed by the new claim proposed in the application or related application. This type of claim, no matter wider than original claim in scope, narrower, identical or different, must be deemed to be included in theme of the present disclosure.

Claims (20)

1. a method, comprising:

By the jet of water from reservoir to, between particulate filter and three-way catalyst, described particulate filter is positioned at described three-way catalyst downstream.

2. method according to claim 1, wherein said injection in response to the discharge pressure signal between described three-way catalyst and described particulate filter higher than threshold pressure.

3. method according to claim 1, wherein said injection in response to micro particle filtering actuator temperature higher than threshold temperature.

4. method according to claim 1, wherein said three-way catalyst comprises the porous substrate being coated with one or more precious metals, described three-way catalyst is configured to one or more discharges transformed in the exhaust flowing through described three-way catalyst, and wherein said particulate filter comprises the reticulated structure with less noble coatings, described particulate filter is configured to the cigarette grain trapped in the exhaust flowing through described particulate filter.

5. method according to claim 1, wherein said injection regenerates the ash content load of the estimation after having completed in response to cigarette grain.

6. method according to claim 5, the ash content load of wherein said estimation is based on the exhaust pressure after the regeneration of described cigarette grain, and comprises the ash content Load Regulation jet of water amount based on described estimation.

7. method according to claim 5, wherein in response to the exhaust pressure between described three-way catalyst and described particulate filter higher than threshold value exhaust pressure, performs the regeneration of described cigarette grain.

8. a system, comprising:

There is the engine of multiple cylinder;

Engine exhaust emission control system, it comprises the particulate filter being positioned at three-way catalyst brick downstream;

Exhaust-duct, enmgine exhaust is connected to described engine exhaust emission control system by it;

Injector, it is connected to reservoir of water via pipeline fluid, and described injector fluid is connected between described three-way catalyst brick and described particulate filter;

Pressure transmitter, it is connected between described three-way catalyst brick and described particulate filter; And

Controller, it has the computer-readable instruction being stored on non-transitory memory, and described controller is used for:

The ash content load that the pressure measured based on described pressure transmitter is estimated in described particulate filter, and

Ash content load in response to described estimation exceedes threshold value ash content load, sprays water via described injector.

9. system according to claim 8, also comprises the EGR channel of the described exhaust-duct being connected to described emission control system upstream, and wherein said instruction also comprises the instruction regulating EGR flow rate for the described injection in response to water.

10. system according to claim 8, wherein said three-way catalyst brick and described particulate filter are contained in the public housing of described emission control system and separate via air gap, and wherein said public housing comprises the salient being positioned between described three-way catalyst brick and described particulate filter, to hold described injector, described injector is positioned to eject water in described air gap.

11. systems according to claim 8, it is one or more that wherein said reservoir of water is connected in charge air cooler and air regulator, and described reservoir of water supplements via from the one or more condensation product in described charge air cooler and described air regulator.

12. systems according to claim 8, wherein said three-way catalyst brick and described particulate filter are accommodated in housing separately and connect via described exhaust-duct fluid, and the described exhaust-duct that wherein said injector is connected between described three-way catalyst brick and described particulate filter.

13. systems according to claim 12, the ash content load of wherein said estimation is determined after the regeneration of described particulate filter completes.

The method of 14. 1 kinds of engines, comprising:

Via the fuel in engine described in spark ignition combustion and the exhaust from described engine is directed to particulate filter;

In response to the exhaust pressure of described particulate filter upstream more than the first threshold pressure, regenerate described particulate filter to remove the particulate matter being stored on described particulate filter; And

After completing in response to described regeneration, the described exhaust pressure of described particulate filter upstream exceedes Second Threshold pressure, sprays water to remove the ash content from described particulate filter between described particulate filter and the three-way catalyst of described particulate filter upstream.

15. methods according to claim 14, wherein measure described exhaust pressure between described three-way catalyst and described particulate filter.

16. methods according to claim 15, wherein regenerating described particulate filter to comprise and exhaust temperature is increased at least threshold temperature reaches predetermined lasting time, wherein said exhaust temperature and predetermined lasting time are determined based on the particulate matter load on described particulate filter at least partly.

17. methods according to claim 16, also comprise: when described exhaust temperature remained at least be in described threshold temperature reach described predetermined lasting time time, it is determined that described regeneration completes.

18. methods according to claim 16, wherein said exhaust temperature increases due to the increase of engine load.

19. methods according to claim 14, wherein said first threshold pressure is greater than described Second Threshold pressure.

20. methods according to claim 14, also comprise: when micro particle filtering actuator temperature exceedes threshold value micro particle filtering actuator temperature, eject water between described three-way catalyst and described particulate filter.