CN109312648A

CN109312648A - Particulate filter for combustion engine

Info

Publication number: CN109312648A
Application number: CN201780036131.7A
Authority: CN
Inventors: C·布林克迈尔
Original assignee: Dr Ing HCF Porsche AG
Current assignee: Dr Ing HCF Porsche AG
Priority date: 2016-06-08
Filing date: 2017-06-07
Publication date: 2019-02-05
Anticipated expiration: 2037-06-07
Also published as: JP6720351B2; KR20190015480A; KR102139222B1; CN109312648B; EP3472441A1; US20190153920A1; JP2019523842A; EP3472441B1; WO2017211468A1; DE102016110527A1

Abstract

The present invention relates to a kind of particulate filters for combustion engine, it is with filtering body (2), wherein the filtering body (2) has the filter inlet (3) that can be flowed through and the filter outlet (4) that can be flowed through, and wherein the filtering body (2) at least has the first passage (5) that can be flowed through and the second channel (6) that can be flowed through, the second end (8) that the first passage has the first end (7) formed towards the filter inlet (3) and formed towards the filter outlet (4), the 4th end (10) that the second channel has the third end (9) formed towards the filter inlet (3) and formed towards the filter outlet (4), and wherein the second end (8) and the third end (9) are formed as cannot flow through, wherein The channel (5,6) Channel fragment (14) that the Channel fragment (13) that can be flowed through can be divided into and cannot flow through, and the exhaust of the filtering body (2) can be wherein flowed through from being transferred in the second channel (6) the first passage (5) via common conduit wall (11) flowing formed between the second channel (6) in the first passage (5), and wherein the conduit wall (11) is formed to separate the carbon black pellet of the exhaust.According to the present invention, in order to improve in the particulate filter (1) for making the reaction temperature of the carbon black pellet burning, the first passage (5) and/or the second channel (6) have heating element (15), wherein the heating element (15) is arranged in the channel (5；6) in the Channel fragment (14) that cannot flow through.

Description

Particulate filter for combustion engine

Technical field

The present invention relates to a kind of particle mistakes as described in the preamble for combustion engine according to Patent right requirement 1 Filter.

Background technique

It there is known for combustion engine, particularly for the particulate filter of self-burning type combustion engine.Particulate filter Salient point in particular, in that multiple channels are alongside one another, especially arrange in parallel to each other, wherein the channel is alternately closed.Through The particulate filter, mode are flowed through on the extending direction of particulate filter by the exhaust that filter inlet flows into are as follows: exhaust The channel of opening from from filter inlet enters at filter outlet via the porous wall being arranged between this two passes Opening channel in.The solid granulates of exhaust are deposited in wall and/or on wall.Since these particles can reduce particulate filter Free overcurrent cross section, as loading gradually increases, carbon black combustion heat release will cause the temperature mistake in particulate filter Degree rises, it is therefore necessary to these are removed from particulate filter by regeneration, that is, by way of converting carbon black pellet Grain.

2 161 420 B1 of patent document EP discloses a kind of particulate filter for combustion engine, the particle Filter is in the channel range that most of solid granulates gather without coating.Therefore a coating is formed respectively in the channel Section and a non-painting interval, the non-painting interval in one of channel are adjacent with the painting interval in another channel.

1 250 952 A1 of open source literature EP discloses a kind of for being designed to the particle of the combustion engine of diesel engine Filter, the particulate filter have the coating for oxidized black, and reaction temperature is lower than 500 DEG C.By particle filtering The preferred material of device realizes the reaction, the form of the material be alkaline earth metal compound, the substance for storing oxygen and platinum, palladium or Rhodium.

7,691,339 B2 of patent document US discloses a kind of particulate filter for combustion engine, the particle Microwave energy is used to reduce the carbon black pellet accumulated in particulate filter by filter.Charcoal is heated using microwave generator herein The microwave absorbing material accommodated in black filter.

10 2,006 032 886 A1 of open source literature DE discloses a kind of particulate filter with functional material coating. The runner of the particulate filter is coated with functional material on its wall surface, and the functional material is modified from first in exothermic reaction It is modified to be transferred to second, and the temperature in particulate filter is caused to increase.

Summary of the invention

The purpose of the present invention is to provide a kind of improved particulate filters for combustion engine.

According to the present invention, this purpose is used for combustion engine with feature described in Patent right requirement 1 by a kind of Particulate filter realize.Of the invention has the expedients scheme of convenient and important improvement project in corresponding subordinate It is provided in claim.

Particulate filter according to the present invention for combustion engine has filtering body, and the filtering body has energy The filter inlet enough flowed through and the filter outlet that can be flowed through.The filtering body includes at least the first passage that can be flowed through With the second channel that can be flowed through, the first passage has the first end formed towards filter inlet and towards filter The second end formed is exported, the second channel goes out with the third end formed towards filter inlet and towards filter The 4th end that mouth is formed.The second end and third end, which are designed to be, cannot flow through or be difficult to flow to a certain extent It crosses, so as to be divided into the Channel fragment that can be flowed through by these channels and cannot flow through or be difficult to flow through to a certain extent Channel fragment.

The first passage with closing or the inflow entrance that is obstructed thus is formd at filter inlet, and in filter Exit forms the second channel with closing or the outflux that is obstructed.The exhaust of particulate filter can be flowed through from first passage Second channel is transferred to via the common conduit wall flowing formed between first passage and second channel.The conduit wall is set Count to separate the carbon black pellet of exhaust.

The Channel fragment as described below that cannot flow through not necessarily refers to being completely closed the Channel fragment that cannot flow through, and It is also to refer to that for example so-called diffusible Channel fragment of the Channel fragment-for being difficult to flow through to a certain extent, oxygen molecule especially can Enough penetrate this Channel fragment for being difficult to flow through.

In order to improve the carbon black pellet combustion reaction temperature in particulate filter, first passage and/or second channel have Heating element, wherein the heating element is arranged in the Channel fragment that cannot flow through in channel.

Heating element is arranged in the Channel fragment that cannot flow through have the advantages that it is multiple.Such as it will not be flowed because of having The heating element of resistance and interfere to flow through particulate filter.Another advantage is that without the particulate filter zone for flowing Domain is used: carbon black pellet combustion reaction temperature can be improved in the case where particulate filter keeps original size.Change sentence It talks about, it means that the structure space of the use of particulate filter remains unchanged, and need not take structure space structural Change measure.For example, if the channel to particulate filter carries out coating treatment, then compared with the channel without coating treatment, It may will reduce the cross section in channel because of coating.However in order to allow the cated particulate filter of tool to reach corresponding to nothing Coating granule filter flows through condition it is necessary to increase the channel cross-section of particulate filter, has cated particulate filter Required structure space therefore can equally become larger.

In a kind of design scheme of the particulate filter according to the present invention, heating element under the conditions of storing up oxygen by occurring The functional material of exothermic reaction is constituted.In other words, it means that heating element to a certain extent can be with spontaneous combustion.Advantage is Only need heating element itself, it is not necessary to the auxiliary device of igniter form is used such as prior art has disclosed as, Such as microwave generator.It, can be according to the relevant temperature of exhaust and/or exhaust as long as the operation of appropriate adjustment combustion engine Corresponding ingredient causes the exothermic reaction of functional material.

It is preferred that can change excitation heating element by the air-fuel ratio of exhaust is used for heat release.Thus can by addition or Change the air-fuel ratio of exhaust by reducing fuel or air.Especially air-fuel can be realized by the rich operation of combustion engine Metachemistry of the air-fuel ratio greater than 1 is realized than the deficient stoichiometric ratio ingredient less than 1, or by the lean-burn operation of combustion engine Ingredient is compared in metering.

It is preferred that can be put by the exhaust air-fuel ratio variation excitation heating element from air-fuel ratio less than 1 to air-fuel ratio greater than 1 Heat.Such as since combustion engine load operation when only owing stoichiometric ratio with very little and running, such as air-fuel ratio is about 0.98, and then especially make combustion engine fuel cut sliding in such a way that band shelves slide oil-break, so that it may realize this air-fuel Than variation.

Such as car deceleration can be obtained this fortune of combustion engine by descent run or utilization combustion engine Row.So especially when realizing short time fuel cut sliding in the way of sliding oil-break with shelves because of descent run or deceleration It waits, temperature will be caused to increase in particulate filter because of heating element heat release.In other words, heating element can be to for example Band shelves slide the operation of short time combustion engine lean-burn caused by oil-break and react, and the temperature generated sharply rises.Advantage is It need not or only need slightly adjustment engine control system for running combustion engine.

In another design scheme of the particulate filter according to the present invention, heating element has and channel cross-section Corresponding element cross-section.Therefore heating element can also be used to single-side sealing other than the function of being improved its temperature Channel.

Preferably at least heating element is formed based on cerium oxide and/or cerium zirconium mixed oxide.These properties and concentration Corresponding oxide has oxygen storage capacity outstanding, can realize that significantly temperature is increased based on exothermic reaction.

If heating element has the noble metal of such as palladium and/or rhodium etc, at least within the scope of certain temperature Direct oxygen storage capacity can also be obtained by these noble metals.

In another preferred design of the particulate filter according to the present invention, the heating element of first passage by First material is constituted, and the heating element of second channel is made of the second material for being different from the first material.Advantage be can The temperature that different amplitudes are formed in grain filter increases.

Particulate filter described in the prior art has relatively low carbon black pellet combustion velocity in principle.Consequence is just Be: for example due in all filter areas almost while the equivalent charcoal that is adsorbed on particulate filter all sites of burn-up It is black, therefore from particulate filter entrance up to, there are very high temperature, may result in some cases in the region exported Particulate filter and/or coating that may be present damage.In this case the temperature of particulate filter near exit may highest. Such as assume that temperature is 800 DEG C, burnout velocity is slower, and the calory burning discharged in filter inlet region will accumulate in In downstream area, equally it can also be gathered there together with the heat discharged in filter outlet front end area.

Therefore the advantages of this design scheme, is, caused temperature, which rises, in filter inlet region is different from mistake Temperature in filter outlets region rises.Heating element in filter inlet region in particulate filter preferably by only existing Such as about 800 DEG C or less lower the first materials with release heat when moderate temperature are constituted, such as palladium, and filter outlet Heating element in region preferably by also can in particulate filter there are the second materials that heat is discharged when higher temperature to constitute, Such as the standard hydrogen-storing material containing a large amount of current triple mode catalytic converters.

Such as in this way more particularly to the particulate filter high from filter outlet heating adsorbance, that is, there are a large amount of charcoals The particulate filter of black particle.If causing to burn at filter outlet or regenerate, the heat of there release will be released really It releases, and " thermic load " will not be caused in upstream region.Under certain boundary condition, especially if flowing velocity It is less high, carbon black burn forward will reverse flow directional velocity moved towards filter inlet, enter and formed there Among particulate filter region.It is advantageous to the first materials to react in moderate temperatures, and the second material is another Reaction in one temperature range.

If other heating elements are arranged in the Channel fragment that can be flowed through, regeneration efficiency can be made into one whereby Step improves.

In another design scheme of the invention, the Channel fragment that cannot flow through has tamper, wherein heating element Completely or partially substitute tamper.Particulate filter described in the prior art has the blocking for only being used to seal closed channel Object.The tamper is solid, and has bigger length.Such as using or being arranged in Otto engine region Particulate filter for, the length of the tamper is usually about 7mm.Filter inlet of the tamper after blocking or Shared mass percent is about 60-70% in filter outlet region.Therefore use by containing a large amount of high oxidation heat store up oxygen at Heating element made of the material divided completely or partially substitutes the tamper, will convert in combustion engine from rich operation When operation to lean-burn, such as oil-break being slided with band shelves and is matched, violent temperature is caused to rise.It thereby realizes especially Efficient particulate filter.

Detailed description of the invention

Other advantages of the invention, feature and thin are obtained from following description of preferred embodiments and by means of attached drawing Section.Without departing from frame of the invention, the above feature referred in the description and feature combine and hereafter exist Feature refer in Detailed description of the invention and/or separately shown in the accompanying drawings and feature combination, not only can be by the group accordingly provided It closes and uses, but also can be combined or be used alone by others.The identical element of identical or function is assigned with phase Same appended drawing reference.In the accompanying drawings:

Fig. 1 is illustrated in particulate filter with the curve of the air-fuel ratio λ of t- λ diagram exhaust and with corresponding t-T In temperature and particulate filter according to the present invention at different location in the particulate filter according to the prior art Temperature curve, calculate and determine by simulation,

Fig. 2 is illustrated in different moments with x-T in the particulate filter according to the prior art and institute according to the present invention The temperature curve in particulate filter stated,

Fig. 3 shows the schematic diagram of particulate filter according to the present invention, and

Fig. 4 shows the Eyring Durham figure of palladium and rhodium element and its oxide.

Specific embodiment

When the combustion engine not being shown specifically is converted to fuel cut sliding from load operation, can use has height The exothermic reaction for storing up the material of oxygen ratio causes violent temperature to rise in particulate filter 1 according to the present invention.With this The ratio of the changeable air-fuel mixture for being supplied to combustion engine simultaneously.It is preferred that from the air-fuel of air-fuel mixture Lean-burn of the air-fuel ratio λ greater than 1 that rich operation than λ less than 1 transforms to air-fuel mixture is run.Therefore particle is flowed through The combustion engine exhaust of filter 1 will have raised oxygen content, can cause exothermic reaction.Oil-break is slided with shelves simultaneously It is greatly improved oxygen content, the temperature that equally may be implemented in particulate filter 1 so significantly increases.

Fig. 1 shows the curve L1 of before known particulate filter air-fuel ratio λ t at any time in lower part with t- λ.It is empty Fire is about that become being apparently higher than 1 value suddenly be exactly that combustion engine is transformed into from load operation for 0.95 value than λ from here At the time of fuel cut sliding.

Fig. 1 shows on top and middle part and converts institute according to operation along the different location of the flow axes of particulate filter Temperature curve T1, T2 and T3 of calculating.The temperature that the top of Fig. 1 shows the particulate filter 1 according to the prior art is bent Line, middle part show the temperature curve of particulate filter 1 according to the present invention.Temperature curve T0 corresponds to so-called entrance Gas temperature before temperature, that is, OPF.

The particulate filter according to the present invention 1 schematically designed according to Fig. 3 has the channel that can be flowed through Segmentation 13 and the Channel fragment 14 that cannot flow through.Temperature curve T1 and T3 are indicated near the filter inlet 3 of particulate filter 1 And the particle mistake in the level near filter outlet 4, namely in the level for passing through the Channel fragment 14 that cannot flow through The thermal characteristics of filter 1.Temperature curve T2 indicates the shape placed in the middle between the level of filter inlet 3 and the level of filter outlet 4 At particulate filter 1 intermediate surface near particulate filter 1 thermal characteristics.

Temperature T1, T2, T3 in particulate filter 1 described in the prior art due to particulate filter 1 thermal capacitance and be delayed ground Follow cooling inlet temperature T0.Temperature T1, T2, T3 in the particulate filter 1 are then shown different according to the present invention Variation.Temperature T1, T3 of level with the Channel fragment 14 that cannot flow through transforms to dilute mixing from (slightly) dense mixture It is only steeply risen at once with imperceptible delay when object, rises about 75 DEG C in this example.If that can not flow Finish the heat release filling of hydrogen-storing material in the Channel fragment 14 crossed, then these temperature T1, T3 follow and turn cold always with being also delayed Inlet temperature T0.

The calculating does not consider that carbon black burns.The measurement not being shown specifically shows When 700 DEG C, carbon black burning is only slowly carried out.When about 850 DEG C, the regeneration for storing carbon black is significantly visible.It is right For load condition depicted herein, the particulate filter 1 of carbon black is not almost without regeneration.It is described according to the present invention to have The particulate filter 1 for the Channel fragment 14 that cannot flow through but can trigger carbon black burning, accelerate it can then in itself Or it maintains to continuing to regenerate.

Fig. 2 illustrated with x-T transformed to before fuel cut sliding from (slight) dense combustion load operation of combustion engine and it The temperature curve of different moments t0, t1, t2, t3, t4 on the direction of the flow axes of particulate filter 1 afterwards.Fig. 2 is on top Temperature curve t0, t1, t2, t3, t4 in the particulate filter 1 according to the prior art is shown, Fig. 2 is shown in lower part Temperature curve t0, t1, t2, t3, t4 in particulate filter 1 according to the present invention.

Temperature curve t0 corresponds to the curve before operation conversion.Temperature curve t1, t2, t3, t4 are after operation is converted Temperature curve, wherein temperature curve t1 20.2 seconds, temperature curve t2 21.2 seconds, temperature curve t3 22.2 seconds and temperature are bent Correspond within line t4 23.2 seconds the temperature curve changed after operation conversion with flow axes.

The particulate filter 1 of combustion engine according to the present invention for not being shown specifically is according to Fig. 3 Schematic diagram designs.In the operational process of the combustion engine of direct injection Otto engine form, since air fuel is mixed It closes object burning and generates the exhaust containing carbon black pellet.

Particulate filter 1 has the filtering with the filter inlet 3 that can be flowed through and the filter outlet 4 that can be flowed through Body 2.Multiple channels 5,6 that can be flowed through are formed in filtering body 2.Channel 5,6 is extend side by side each other along longitudinal axis L, herein Flowing is carried out along longitudinal axis L.

Channel 5,6 alternately has closed end and the closed end at filter outlet 4 at filter inlet 3 Portion.Additionally illustrate multiple channels and the working method of particulate filter 1 using first passage 5 and second channel 6.

First passage 5 have the first end 7 formed towards filter inlet 3 and towards the formation of filter outlet 4 the Two ends 8.Second channel 6 have the third end 9 formed towards filter inlet 3 and towards the formation of filter outlet 4 the Four ends 10.The second end 8 and third end 9 cannot flow through.Exhaust is logical via first passage 5 and second from first passage 5 The common flowing of conduit wall 11 formed between road 6 is transferred in second channel 6.

Conduit wall 11 is porous design, has flowing permeability, wherein flowing through the carbon black pellet product of the exhaust of conduit wall 11 Gather or is deposited on conduit wall 11.Exhaust flows through particulate filter 1 along the arrow direction indicated.

The end 8,9 that cannot flow through in channel 5,6 is enclosed by tamper 12.In other words, channel 5,6 respectively has The Channel fragment 13 that can be flowed freely over and the Channel fragment 14 that cannot flow through.

Tamper 12 has element cross-section QE corresponding with the cross section Q in channel 5,6.In embodiment shown in the drawings In, due to channel 5,6 cross sections having the same, element cross-section QE also corresponds to the cross section Q of second channel 6. In the embodiment that one kind is not shown specifically, channel 5,6 has different cross section Q.This means that tamper 12 has and phase The element cross-section QE for answering the cross section Q in channel 5,6 to match.

In an illustrated embodiment, the element cross-section QE of tamper 12 is constant on the length L of tamper 12.Member Part cross section QE is equally possible to be changed with its length L.Thus, for example in the embodiment that one kind is not shown specifically, if channel 5,6 have conical by its shape, then tamper 12 has truncated cone, have the element cross-section QE changed with length LE.

In combustion engine operational process, carbon black pellet is gathered in particulate filter 1, particulate filter 1 it is effective Overcurrent cross section can reduce with the time.Effective overcurrent cross section, which reduces, causes the exhaust back pressure of combustion engine to increase, may It will lead to gas exchange loss raising.This can cause the fuel consumption of combustion engine to increase in the case where power is constant again, or The power of combustion engine is caused in the identical situation of fuel consumption to be reduced.Therefore according to the loading of particulate filter 1 into The regeneration of row particulate filter 1.

For the regeneration of particulate filter 1, which has at least one heating element 15, the heating element cloth It sets in the Channel fragment 14 that cannot flow through.Heating element 15 is made of a kind of functional material, and the functional material can be in excess In other words exothermic reaction under air conditions can discharge heat, rise so as to cause the temperature in particulate filter 1.

Heating element 15 uses the design of 12 form of tamper and substitutes the tamper.Heating element 15 equally can also be with A part as tamper 12.Heating element under the conditions of storing up oxygen by that can cause the material of exothermic reaction to constitute.In other words, This means that heating element 15 will discharge automatically heat because of its molecular structure if foring storage oxygen.This means that release is anti- Answer heat.

The material is the solid matter that may be at least two modified states.Under the rich operation of combustion engine It is at least partially located at modified with reduction state, i.e. the first modified state, and is changed under the operation of the lean-burn of combustion engine Oxidation modification state, i.e. second of modified state.The solid matter is also referred to as functional material, preferably by cerium oxide and zirconium oxide The mixed oxide of composition, when necessary there are also such as metal and/or rare earth metal, lanthanum, praseodymium, yttrium and aluminium oxide etc other Substance.

It is also suitable " more active " precious metal palladium and rhodium, these noble metals also directly have oxygen storage capacity.These your gold Category will not aoxidize under such as about 900 DEG C of higher temperatures, therefore will not store up oxygen, and keep its noble metal state.Whether Not for the exhaust with lean-burn ingredient under the exhaust or lean-burn operation with dense combustion ingredient under combustion engine rich operation It is important.According to shown in Fig. 4, rhodium may will form rhodium oxide within about 880 DEG C, and therefore may table within the temperature It is now active.

Functional material can be used for exothermic reaction according to its ingredient within the scope of different temperature.Such as first material have Ingredient, such as palladium for having reducing/oxidizing ability in the low temperature and moderate temperatures within about 700 DEG C.Second material tool Have can also in high temperature range exothermic reaction ingredient, such as TWC (Three-way-catalyst) standard hydrogen-storing material.Change sentence It talks about, the first material can be reacted under the low temperature present in particulate filter 1 and moderate temperature, and the second material can be It is reacted at all temperature present in particulate filter 1.

It is clear that all tampers 12 can be replaced by heating element 15, to improve power of regeneration.

The same row of particulate filter 1 with the multiple heating elements 15 being made of a kind of material and/or mixing material it Effectively.It, close to engine or far from engine, can also be selected heating element according to the installation situation of particulate filter 1 15 are placed in entrance side or outlet side.

In the preferred embodiment that one kind is not shown specifically, all tampers 12 of particulate filter 1 are heated element 15 are replaced.The embodiment that the another kind of particulate filter 1 according to the present invention is not shown specifically has in the second end 8 The heating element 15 being made of the first material, and there is the heating element 15 being made of the second material in third end 9.

The embodiment that the another kind of the particulate filter is not shown specifically according to the present invention, in separate central longitudinal axis The second end and third end have the heating element being made of the first material.The embodiment is close to the second of central longitudinal axis End and third end have the heating element being made of the second material, or at all without heating element.

Other heating elements 15 can also be arranged in the Channel fragment 13 that can be flowed through.The heating element can be by difference It is constituted in the other materials of the first material and the second material.I.e. in other words, which is different from first by oxygen storage capacity The other materials of material and the second material is constituted.

List of numerals

1 particulate filter

2 filtering bodies

3 filter inlets

4 filter outlets

5 first passages

6 second channels

7 first ends

8 the second ends

9 third ends

10 the 4th ends

11 conduit walls

12 tampers

13 Channel fragments that can be flowed through

14 Channel fragments that cannot flow through

15 heating elements

L longitudinal axis

LE length

L1 curve

Q channel cross-section

QE element cross-section

T temperature

T0 inlet temperature

The first temperature curve of T1

Second of temperature curve of T2

The third temperature curve of T3

The t time

Temperature curve before t0 operation conversion

Temperature curve after t1 operation conversion

Temperature curve after t2 operation conversion

Temperature curve after t3 operation conversion

Temperature curve after t4 operation conversion

λ air-fuel ratio

Claims

1. a kind of particulate filter for combustion engine, with filtering body (2), wherein the filtering body (2) has energy The filter inlet (3) enough flowed through and the filter outlet (4) that can be flowed through, and wherein the filtering body (2) at least has The first passage (5) that can be flowed through and the second channel (6) that can be flowed through, the first passage have to enter towards the filter First end (7) that mouth (3) is formed and the second end (8) formed towards the filter outlet (4), the second channel tool The 4th end for having the third end (9) formed towards the filter inlet (3) and being formed towards the filter outlet (4) (10), and wherein the second end (8) and the third end (9) are formed as cannot flow through, wherein the channel (5, 6) Channel fragment (14) that the Channel fragment (13) that can be flowed through can be divided into and cannot flow through, and can wherein flow through described The exhaust of filtering body (2) from the first passage (5) via in the first passage (5) between the second channel (6) Common conduit wall (11) flowing formed is transferred in the second channel (6), and wherein the conduit wall (11) is formed For the carbon black pellet that can separate the exhaust,

It is characterized in that,

In order to improve in the particulate filter (1) for making the reaction temperature of the carbon black pellet burning, the first passage (5) and/or the second channel (6) has heating element (15), wherein the heating element (15) is arranged in the channel (5； 6) in the Channel fragment (14) that cannot flow through and the functional material by carrying out exothermic reaction under the conditions of storing up oxygen is constituted.

2. particulate filter according to claim 1,

It is characterized in that,

The heating element (15) can be excited for heat release by the variation of the air-fuel ratio (λ) of exhaust.

3. particulate filter according to claim 2,

It is characterized in that,

It can be excited by the air-fuel ratio (λ) of exhaust from the value having less than 1 to the variation of the air-fuel ratio (λ) of the value greater than 1 The heating element (15) is used for heat release.

4. particulate filter according to one of the above claims,

It is characterized in that,

The heating element (15) has with the cross section (Q) of the channel (5,6) corresponding element cross-section (QE).

5. particulate filter according to one of the above claims,

It is characterized in that,

The heating element (15) is at least made of cerium oxide and zirconium oxide and/or its mixed oxide.

6. particulate filter according to one of the above claims,

It is characterized in that,

The heating element (15) has palladium and/or rhodium.

7. particulate filter according to one of the above claims,

It is characterized in that,

The heating element (15) of the first passage (5) is made of the first material, and the described of the second channel (6) adds Thermal element (15) is made of the second material for being different from the first material.

8. particulate filter according to claim 7,

It is characterized in that,

First material is formed as anti-for carrying out under the low temperature present in the particulate filter (1) and moderate temperature It answers, and second material is formed as being reacted at all temperature present in the particulate filter (1).

9. particulate filter according to one of the above claims,

It is characterized in that,

Other heating elements (15) are disposed in the Channel fragment that can be flowed through.

10. particulate filter according to one of the above claims,

It is characterized in that,

The Channel fragment that cannot flow through has tamper (12), wherein the heating element (15) is formed as complete or portion Ground is divided to substitute the tamper (12).