阅读说明：本技术 用于内燃机的废气后处理的方法和装置 (The method and apparatus of exhaust after-treatment for internal combustion engine ) 是由 C.尼 于 2019-05-22 设计创作，主要内容包括：本发明涉及一种用于内燃机(10)的废气后处理的方法。为内燃机(10)的废气后处理设有排气装置(20),在所述排气装置(20)中,沿内燃机(10)的废气通过排气装置(20)的流动方向布置有第一三元催化器(30)并且在第一三元催化器(30)的下游布置有至少一个另外的三元催化器(34、36)。在此,在排气装置的废气通道(38)中,在各三元催化器(30、34、36)的上游分别布置有至少一个λ传感器(40、42、44)。在所建议的方法中,检测三元催化器(30、34、36)的构件温度(T<Sub>K1</Sub>、T<Sub>K2</Sub>)并且将所述构件温度(T<Sub>K1</Sub>、T<Sub>K2</Sub>)与起燃温度(T<Sub>LOK1</Sub>、T<Sub>LOK2</Sub>)进行比较。在此,内燃机(10)的λ调节通过已达到起燃温度(T<Sub>LOK1</Sub>、T<Sub>LOK2</Sub>)的最后的三元催化器(30、34、36)上游的λ传感器(40、42、44)进行。此外,按照本发明还建议一种实施这种方法的废气后处理系统。(The present invention relates to a kind of methods of exhaust after-treatment for internal combustion engine (10).Exhaust apparatus (20) are equipped with for the exhaust after-treatment of internal combustion engine (10), in the exhaust apparatus (20), the first ternary catalyzing unit (30) is disposed with by the flow direction of exhaust apparatus (20) along the exhaust gas of internal combustion engine (10) and has at least one other in the arranged downstream of the first ternary catalyzing unit (30) ternary catalyzing unit (34,36).Here, being respectively disposed at least one exhaust gas oxygensensor (40,42,44) in the upstream of each ternary catalyzing unit (30,34,36) in the exhaust steam passage (38) of exhaust apparatus.In proposed method, the member temperature (T of ternary catalyzing unit (30,34,36) is detected K1 、T K2 ) and by the member temperature (T K1 、T K2 ) and initiation temperature (T LOK1 、T LOK2 ) be compared.Here, the λ of internal combustion engine (10) is adjusted by having reached initiation temperature (T LOK1 、T LOK2 ) last ternary catalyzing unit (30,34,36) upstream exhaust gas oxygensensor (40,42,44) carry out.In addition, also suggesting a kind of exhausted gas post-processing system for implementing this method according to the present invention.)

1. method of the one kind for the exhaust after-treatment of internal combustion engine (10), the exhaust outlet (16) of the internal combustion engine (10) and exhaust are filled Set (20) connection, wherein in the exhaust apparatus (20), be disposed with the by the flow direction of exhaust apparatus (20) along exhaust gas One ternary catalyzing unit (30) and there are the second ternary catalyzing unit (34,36) in the arranged downstream of the first ternary catalyzing unit (30), In, in the exhaust steam passage (38) of exhaust apparatus (20), there is the first exhaust gas oxygensensor in the upstream arrangement of the first ternary catalyzing unit (30) (40), there is other λ in the downstream of the first ternary catalyzing unit (30) and in the upstream arrangement of the second ternary catalyzing unit (34,36) Sensor (42,44), the described method comprises the following steps:

Detect the member temperature (T of the first and second ternary catalyzing units (30,34,36)_K1、T_K2)；

By the member temperature (T_K1、T_K2) and the first and second ternary catalyzing units (30,34,36) respective initiation temperature (T_LOK1、T_LOK2) be compared；With

By have reached initiation temperature last ternary catalyzing unit (30,34,36) upstream exhaust gas oxygensensor (40,42,44) into The λ of row internal combustion engine (10) is adjusted.

2. according to the method for claim 1, which is characterized in that the λ is adjusted to carry out according to the principle that intrinsic frequency is adjusted.

3. method according to claim 1 or 2, which is characterized in that the λ adjust after the cold start-up of internal combustion engine (10) by First exhaust gas oxygensensor (40) of the first ternary catalyzing unit (30) upstream is implemented.

4. according to method described in one of claims 1 to 3, which is characterized in that when being arranged in exhaust apparatus (20) middle and lower reaches Other ternary catalyzing unit (34,36) reaches initiation temperature (T_LOK2) when, λ, which is adjusted, passes through ternary catalyzing unit (the 34,36) upstream Exhaust gas oxygensensor extension.

5. according to method described in one of Claims 1-4, which is characterized in that the exhausted gas post-processing system (20) is additionally Including particulate filter (32,34), wherein the member temperature (T as ternary catalyzing unit (30,34,36)_K1、T_K2) supplement, Detect the member temperature (T of particulate filter (32,34)_OPF)。

6. according to the method for claim 5, which is characterized in that in the threshold temperature (T for being higher than particulate filter (32,34)_S) When identify particulate filter (32,34) Possibility of Regeneration.

7. according to the method for claim 6, which is characterized in that must recognizing the regenerated of particulate filter (32,34) The property wanted is and at the same time recognize higher than threshold temperature (T_S) member temperature (T_OPF) when, to be higher than the combustion air of stoichiometry Internal combustion engine (10) are run than (λ > 1).

8. according to method described in one of claim 5 to 7, which is characterized in that be so selected above chemistry by regulation scheme The amplitude of metering, to occur to intercept continuing again for the soot in particulate filter (32,34) within the scope of related temperature It is raw.

9. according to the method for claim 8, which is characterized in that be only the phase in particulate filter (32,34) offer exhaust gas Answer higher amount of oxygen, and ternary catalyzing unit (30,36) is to adjust the exhaust gas that is substantially equal to stoichiometry in oscillation logical Stream.

10. one kind is used for the exhausted gas post-processing system of internal combustion engine (10), have exhaust apparatus (20), in the exhaust apparatus (20) In, the first ternary catalyzing unit (30) is disposed with by the flow direction of exhaust apparatus (20) along exhaust gas and in the first three-element catalytic The ternary catalyzing unit (34,36) that the arranged downstream of device (30) has at least one other, wherein in the first ternary catalyzing unit (30) Upstream arrangement has the first exhaust gas oxygensensor (40), the first ternary catalyzing unit (30) downstream and the second ternary catalyzing unit (34, 36) upstream arrangement has other exhaust gas oxygensensor (42,44), and the exhausted gas post-processing system also has controller (50), the control Device (50) setting processed is used for, and when machine readable program code is executed by controller (50), is implemented according to claim 1 to 9 One of described in method.

11. exhausted gas post-processing system according to claim 10, which is characterized in that under the first ternary catalyzing unit (30) It swims and has particulate filter (32,34) in the upstream arrangement of the second ternary catalyzing unit (36).

12. exhausted gas post-processing system according to claim 11, which is characterized in that the particulate filter (32) has The coating of catalytic action and it is designed as quaternary catalytic device (34).

13. according to exhausted gas post-processing system described in claim 11 or 12, which is characterized in that in the first ternary catalyzing unit (30) Downstream and be disposed with the second exhaust gas oxygensensor (42), Yi Ji in the exhaust steam passage (38) of the upstream of particulate filter (32) The downstream of particulate filter (32) and the 3rd λ is disposed in the exhaust steam passage (38) of the upstream of the second ternary catalyzing unit (36) Sensor (44).

14. according to exhausted gas post-processing system described in one of claim 10 to 13, which is characterized in that be equipped with secondary ventilation system Auxiliary air can be inputted the exhaust outlet of internal combustion engine (10) with the secondary ventilation system (28,54,56) by (28,54,56) (16) or in the exhaust outlet downstream (16) and in the first ternary catalyzing unit (30) upstream input exhaust apparatus (20).

Technical field

The present invention relates to a kind of exhaust after-treatments for internal combustion engine as described in the preamble according to independent claims Method and a kind of for implementing the exhausted gas post-processing system of this method.

Background technique

Emission regulation from now on proposes high request to the exhaust after-treatment of engine raw emissions and internal combustion engine.With The introducing of Euro 6d-Temp emission regulation, motor vehicles have to comply with emission limit (the practical row of driving in actual motion It puts).The use of multistage exhaust after-treatment scheme proposes problem, described problem for new emission regulation in gasoline engine field Prepare about the controllability of various exhaust gas after-treatment components and the adjusting quality of exhaust gas after-treatment components and operation.This shows The λ regulation scheme of regulating system with rigid design only provides the emission result of suboptimum.

A kind of internal combustion with exhaust system for running motor vehicle as known to 10 2,010 002 586 A1 of patent document DE The method of machine is disposed at least one catalyst converter and at least one exhaust gas oxygensensor in exhaust system.Internal combustion engine is urged for heating It is run to conversion between lean fuel air gaseous mixture and dense fuel-air mixture after changing the cold start-up of device.Exhaust gas oxygensensor is cold It is so heated after starting, so that the exhaust gas oxygensensor at most is ready for running after ten seconds, and internal combustion engine is to be based on exhaust gas oxygensensor Signal two point form adjust operation.Here, being run with lean fuel air gaseous mixture and running it with dense fuel-air mixture Between conversion respectively by exhaust gas oxygensensor signal trigger.

A kind of λ as known to 10 2,013 201 734 A1 of patent document DE in the exhaust system for running internal combustion engine There is at least one to be located at the first exhaust gas oxygensensor and at least one of catalyst converter upstream for the method for sensor device, the exhaust gas oxygensensor device A the second exhaust gas oxygensensor positioned at catalyst converter downstream.Here, the second exhaust gas oxygensensor is designed as phase step type sensor.Here, carrying out the The diagnosis of the indicatrix offset of one exhaust gas oxygensensor and the adjustment for carrying out indicatrix offset error when necessary.Here, in order to examine Disconnected, when λ is adjusted and activated, detection represents the value of the oxygen storage capacity of catalyst converter and represents the ability from catalyst converter output oxygen Value.The indicatrix offset of the first exhaust gas oxygensensor is calculated by the ratio of oxygen storage capacity and oxygen fan-out capability.

2 884 066 A1 of patent document EP discloses a kind of method for diagnosing object such as catalyst converter or filter.For The especially accurately report for obtaining the function about catalyst converter, provides herein, in order to measure the reactivity of catalytic action, by One device is applied by end face of the opening to catalyst converter has the test(ing) medium for defining component (such as propane or carbon monoxide), and The concentration of at least one reproducibility or oxidizing component of test(ing) medium after through catalyst converter is measured on downstream position.But such as This, which applies, determines that combined gas or exhaust gas are only capable of in laboratory operation.Therefore this method is not suitable in practical driving The Emission Optimization.

But the shortcomings that known method, is, the method does not consider the conversion performance relevant to temperature of catalyst converter fully, And the exhaust after-treatment of suboptimum is therefore only generated especially in the incipient stage or after the operation phase of exhaust systems cool.

Summary of the invention

Technical problem to be solved by the present invention lies in improve turning for the catalyst converter being arranged in the exhaust apparatus of internal combustion engine Change performance and therefore further decreases the discharge of poisonous waste in practical driving.

According to the present invention, the technical problem is solved by the method for the exhaust after-treatment for internal combustion engine, the internal combustion The exhaust outlet of machine is connect with exhaust apparatus, wherein in the exhaust apparatus, along internal combustion engine exhaust gas percolation exhaust apparatus it is useless The flow direction in gas channel is disposed with the first ternary catalyzing unit and has at least one in the arranged downstream of the first ternary catalyzing unit Other ternary catalyzing unit.Here, be disposed in the exhaust steam passage of the first ternary catalyzing unit upstream the first exhaust gas oxygensensor (or For lambda sensor), it is disposed in the first ternary catalyzing unit downstream and in the exhaust steam passage of other ternary catalyzing unit upstream Other exhaust gas oxygensensor.The method at least includes the following steps:

Detect the member temperature of the first ternary catalyzing unit and the second ternary catalyzing unit；

By the member temperature of the first ternary catalyzing unit and the second ternary catalyzing unit and the respective initiation temperature of ternary catalyzing unit It is compared；

Pass through that exhaust gas oxygensensor implementation in the last ternary catalyzing unit upstream for reaching initiation temperature of streamwise The λ of internal combustion engine is adjusted.

By the method according to the invention it is contemplated that the member temperature of the current dominant on multiple ternary catalyzing units, so as to λ is adjusted and is expanded to the control object of corresponding maximum possible and makes on controlled plant as extensive as possible and therefore λ in other words Adjust the dominance condition being changeably adapted in exhaust apparatus.

The advantageous extension design and improved procedure of independent claims the method can be by referring in dependent claims Feature obtain.

It is provided in preferred design scheme of the invention, λ adjusting is adjusted according to intrinsic frequency The principle of (Eigenfrequenzregelung or control for self-frequency) carries out.In the range of present patent application, intrinsic frequency-λ Adjusting can be understood as such regulating system, in the regulating system, used catalyst converter volume completely by through-flow until Occur respectively pre-control component lean mixture break-through or rich mixture break-through (Mager-oder Fettdurchbruch, or Referred to as dilute break-through or dense break-through).It is possible thereby to detect component on by the exhaust gas oxygensensor in through-flow catalyst converter volume downstream " break-through (Durchbrechen) ", and then just converted to another pre-control.The process makes being urged after being located at by other It is indispensable to change device, the conversion volume of especially other ternary catalyzing unit offer.If λ adjusts the original adjusted according to intrinsic frequency Reason is implemented, then the volume that is totally converted of catalyst converter can be used for converting discharge.Herein also by the way that optionally balance turns before break-through The aging hot spot avoided in catalyst converter is changed, the service life of catalyst converter is thus improved.Furthermore it can rapidly correct in entire exhaust system The middle position λ on system, wherein offset can be adjusted.It is possible thereby to realize the particularly effective exhaust gas with combustion with minimal Post-processing.

It is provided in the preferred embodiment of the method, after internal combustion engine cold start-up, λ is adjusted by the first three-element catalytic First exhaust gas oxygensensor of device upstream is implemented.After internal combustion engine start, heat up first close to the first catalyst converter of engine and usual First component as exhaust after-treatment reaches its initiation temperature T_LOK1.It is therefore an objective to pass through the one or three in the incipient stage First catalyst converter makes every effort to the optimal conversion of exhaust gas, until being additionally disposed in the exhaust gas in downstream along the flow direction of exhaust gas percolation exhaust steam passage After-treatment components also reach initiation temperature.

It is preferred here that when reaching initiation temperature in other ternary catalyzing unit of the arranged downstream in exhaust apparatus When, λ is adjusted to be extended by the exhaust gas oxygensensor of the other ternary catalyzing unit upstream.By reaching rising for the second ternary catalyzing unit The extension that λ is adjusted after combustion temperature can make two ternary catalyzing units in the operation item as ideal as possible for converting harmful substance It is run under part, to realize the optimum discharge of exhaust after-treatment.

It is provided in the preferred embodiments of the present invention, the exhausted gas post-processing system additionally includes particle filtering Device, wherein the member temperature of particulate filter is also detected other than the member temperature of ternary catalyzing unit.Due to being discharged from Europe 6 Law making, which rises, also provide the limit value of particulate emission for petrol engine, thus to many motor vehicles with petrol engine and Speech may need to use particulate filter in exhaust aftertreatment device.Particulate filter can have three-element catalytic effect Coating.Such particulate filter is referred to as quaternary catalytic device.In the range of present patent application, this quaternary catalytic device can also To be interpreted as ternary catalyzing unit, because this quaternary catalytic device also completes the function of ternary catalyzing unit.

It is preferred here that identifying the Possibility of Regeneration of particulate filter when being higher than the threshold temperature of particulate filter. In order to aoxidize carbon soot particles of the interception in particulate filter and particulate filter regeneration be made to need the oxygen at particulate filter The excessive minimum temperature with 550 DEG C simultaneously.If recognizing such temperature, the sky that will burn can be passed through in a simple manner Gas ratio is adjusted towards " thin ", namely towards the combustion air ratio for being higher than stoichiometry, to implement (part) of particulate filter Regeneration.

It is particularly preferred that in the regenerated necessity for recognizing particulate filter and at the same time recognizing particulate filter Member temperature be higher than threshold temperature when, be higher than stoichiometry combustion air than operation internal combustion engine.By being higher than chemistry meter The operation of amount is aoxidized the soot in particulate filter is intercepted.

It is provided in the alternatively improved mode of the method, the width of stoichiometry is so selected above by regulation scheme Value, so that the constant regeneration of soot of the interception in particulate filter occur within the scope of related temperature.It is suitable by selecting Amplitude make, do not occur during the regeneration of particulate filter by the lean mixture break-through of the second ternary catalyzing unit and because This does not occur the increase of discharged nitrous oxides.Therefore particulate filter may be implemented substantially discharges neutral regeneration.

Here it is preferred, in particular, that only particulate filter provides the corresponding higher amount of oxygen in exhaust gas, and ternary The exhaust gas that catalyst converter is substantially equal to stoichiometry in adjusting oscillation is through-flow.The amplitude that can so select λ to adjust herein, To which the oxygen memory of ternary catalyzing unit, especially the second ternary catalyzing unit is filled or empties, without will lead to by corresponding The lean mixture break-through or rich mixture break-through of ternary catalyzing unit.It is possible thereby to avoid secondary during particulate filter regeneration Discharge increases.

According to the present invention, it is proposed that a kind of exhausted gas post-processing system for internal combustion engine, the exhausted gas post-processing system have Exhaust apparatus is disposed with the one or three by the flow direction of the exhaust steam passage of exhaust apparatus along exhaust gas in the exhaust apparatus First catalyst converter and the ternary catalyzing unit for having at least one other in the arranged downstream of the first ternary catalyzing unit, wherein first The upstream arrangement of ternary catalyzing unit has the first exhaust gas oxygensensor, the first ternary catalyzing unit downstream and be the second ternary catalyzing unit Upstream arrangement have an other exhaust gas oxygensensor, the exhausted gas post-processing system also has controller, and the controller setting is used for, When machine readable program code is executed by controller, implement the method according to the invention.Pass through exhaust gas according to the invention Respective operation preparation and its transformation efficiency can be considered according to member temperature for after-treatment system and thereby, it is ensured that discharge is neutral Exhaust after-treatment.Furthermore the regeneration of special operating condition such as particulate filter can be considered in exhaust after-treatment, with Just further improve the result of exhaust after-treatment and avoid secondary emission.

Provided in the preferred embodiment of exhausted gas post-processing system, the first ternary catalyzing unit downstream and be The upstream arrangement of two ternary catalyzing units has particulate filter.Due to also being provided from the formulation of 6 emission regulation of Europe for petrol engine The limit value of particulate emission, therefore may be needed in exhaust aftertreatment device for many motor vehicles with petrol engine Use particulate filter.Therefore, particle can also be removed from exhaust gas other than gaseous exhaust gas constituents.

The particulate filter can have the coating of catalytic action and be designed as quaternary catalytic device.The particle mistake Filter additionally completes the function of ternary catalyzing unit by the coating for playing catalytic action on particulate filter.Therefore it can be improved In total for the catalyst converter volume of harmful substance trans-utilization, especially to provide additional catalyst converter volume under high loads simultaneously And the discharge in actually driving is avoided to increase.

It is preferred here that in the exhaust steam passage of the downstream in the first ternary catalyzing unit and the upstream in particulate filter It is disposed with the second exhaust gas oxygensensor, and the downstream in particulate filter and exhaust steam passage in the upstream of the second ternary catalyzing unit In be disposed with third exhaust gas oxygensensor.Thus λ adjusting can be on the component that each of exhaust aftertreatment device plays three-element catalytic It carries out, so as to realize the optimum of transformation efficiency.

It is equipped with secondary ventilation system in an advantageous embodiment of the invention, it can be by two with the secondary ventilation system It in the exhaust outlet of secondary air input internal combustion engine or in the exhaust outlet downstream and is the input exhaust of the first ternary catalyzing unit upstream In device, especially exhaust outlet downstream and be exhaust-driven turbo-charger exhaust-gas turbo charger turbine upstream input exhaust steam passage in.Pass through two Secondary air system can accelerate the heating of ternary catalyzing unit after the cold start-up of internal combustion engine.Furthermore particulate filter can be provided again The raw oxygen needed, without to be higher than the combustion air mixture operation internal combustion engine of stoichiometry and not will increase internal combustion engine Raw emissions, especially nitrogen oxides discharge.

If the different embodiments mentioned in this application of the invention are similarly implemented in several cases, can It is enough to be combined with each other with advantage.

Detailed description of the invention

Illustrate the present invention with reference to the accompanying drawings in embodiment below.In the accompanying drawings:

Fig. 1 is shown with the internal combustion engine for implementing the exhausted gas post-processing system of the method according to the invention；With

Fig. 2 shows the flow charts of the method for implementing the exhaust after-treatment according to the invention for internal combustion engine.

Specific embodiment

Fig. 1 shows internal combustion engine 10, and internal combustion engine 10 is designed as the petrol engine lighted a fire by 18 external source of spark plug.Internal combustion engine 10 have air inlet 12, multiple combustion chambers 14 and exhaust outlet 16.The exhaust outlet 16 of internal combustion engine 10 is connect with exhaust apparatus 20.Internal combustion Machine 10 is preferably designed for the internal combustion engine 10 being pressurized by exhaust-driven turbo-charger exhaust-gas turbo charger 22.For this purpose, exhaust-driven turbo-charger exhaust-gas turbo charger 22 has cloth The turbine 26 in the exhaust steam passage 38 of exhaust apparatus 20 is set, turbine 26 drives to be supplied in the unshowned air of internal combustion engine 10 To the compressor 26 in system and therefore improve the inflating condition of combustion chamber 14.In exhaust steam passage 38, pass through along exhaust gas useless There is the first ternary catalyzing unit 30 in the flow direction in gas channel 38 in the arranged downstream of turbine 26, in the first ternary catalyzing unit 30 Arranged downstream have particulate filter 32, and have the second ternary catalyzing unit 36 in the arranged downstream of particulate filter 32.Particle Filter 32 can have the coating of three-element catalytic effect and be designed as so-called quaternary catalytic device 34.Increase in exhaust gas turbine The downstream of the turbine 26 of depressor 22 and be that the upstream arrangement of the first ternary catalyzing unit 30 has the first exhaust gas oxygensensor 40, the first λ is passed Sensor 40 is preferably designed for broadband exhaust gas oxygensensor.The first ternary catalyzing unit 30 downstream and be particulate filter 32 or quaternary The upstream arrangement of catalyst converter 34 has the second exhaust gas oxygensensor 42.In particulate filter 32 or 34 downstream of quaternary catalytic device and second Third exhaust gas oxygensensor 44 is disposed in the exhaust steam passage 38 of 36 upstream of ternary catalyzing unit.In 30 downstream of the first ternary catalyzing unit and The first temperature sensor 46 is disposed in the exhaust steam passage 38 of 34 upstream of particulate filter 32 or quaternary catalytic device.In particle mistake The downstream of filter 32 or quaternary catalytic device 34 and be that the upstream arrangement of the second ternary catalyzing unit 36 has second temperature sensor 48. Exhaust gas oxygensensor 40,42,44 and temperature sensor 46,48 are connect by signal wire 52 with the controller 50 of internal combustion engine 10.In internal combustion engine 10 are equipped with secondary ventilation system 28,54,56, which includes secondary air pump 28,54 and of secondary air conduit Secondary air valve 56.Secondary air conduit 54 is passed through in the cylinder head of the exhaust side of internal combustion engine 10 or is passed through the first three-element catalytic In the section of the exhaust steam passage 38 of 30 upstream of device, especially it is passed through in 16 downstream of exhaust outlet and is exhaust-driven turbo-charger exhaust-gas turbo charger 22 In the section of the exhaust steam passage 38 of 26 upstream of turbine.

The present invention provides a kind of λ regulation scheme, the λ regulation scheme consider about each exhaust gas after-treatment components 30,32, 34,36 member temperature (T_K1、T_K2、T_OPF) information and adapt its adjusting amplitude and fine tuning to the control pair of maximum possible As.In addition, the boundary condition of exhaust gas after-treatment components 30,32,34,36 is embodied in adjusting amplitude and control object parameter, from And realize the best adjusting of discharge Best Point applicable respectively.

The present invention include follow intrinsic frequency Principles of Regulation for more than one catalyst converter multistage exhaust gas after The λ of reason system is adjusted.Here, by sensing mechanism, temperature sensor 46,48 especially shown in FIG. 1 or pass through exhaust gas Temperature model consider exhaust gas after-treatment components 30,32,34,36, especially ternary catalyzing unit 30,36 there is currently member temperature T_K1、T_K2、T_OPF, so that intrinsic frequency is expanded in the control object of maximum possible respectively.In only the first ternary catalyzing unit 30 In the case where being completely warmed, by the first exhaust gas oxygensensor 40 and the known control object parameter setting for the control object Intrinsic frequency in the exhaust gas grade.Once the driving cycle that other exhaust gas after-treatment components 32,34,36 are selected due to client Also it is completely warmed and reaches its initiation temperature T_LOK2, then λ adjusting be automatically expanded to other exhaust gas after-treatment components 32, 34, the 36, especially second ternary catalyzing unit 36, and that exhaust gas oxygensensor 42 in front of the exhaust gas after-treatment components of last activation, 44, which are respectively used to assessment, adjusts break-through.In the case where the activation condition of the exhaust gas after-treatment components in downstream is eliminated, especially work as row When device of air 20 is cooling or due to targetedly close exhaust gas after-treatment components 32,34,36, λ adjusting be retracted into the smallest tune That is section scheme is only adjusted by the first exhaust gas oxygensensor 40.In addition, each exhaust gas after-treatment components can be considered when λ is adjusted 30,32,34,36 particularity.Using the HC suction preferably adjacent to the first component as exhaust after-treatment of engine arrangement In the case where adnexa, λ adjusting is designed in this way, to would rather generate excessive unburned carbon during the cold start-up of internal combustion engine 10 Hydrogen compound (HC), because these unburned HC can be stored in HC absorber.In this case, it is higher than stoichiometry Adjusting strategy it is nonsensical.

It, can be by proposed λ regulation scheme so being selected above using particulate filter 32,34 The adjusting amplitude of metering is learned, to occur to intercept holding for the soot in particulate filter 32,34 within the scope of related temperature Continuous regeneration.Here, the formation of time (Streckenzeiten) so selection adjusting amplitude according to the known control object, thus Only particulate filter 32,34 provides the corresponding higher amount of oxygen in exhaust gas, and for ternary catalyzing unit 30,36, chemistry Operating in adjusting oscillation for metering is possible.Therefore optimum discharge may be implemented by this method.

The flow chart of the method according to the invention for exhaust after-treatment is shown in FIG. 2.If starting internal combustion engine 10, Then detection ternary catalyzing unit 30,36 and existing exhaust gas after-treatment components other when necessary in first method step<100> 32,34 member temperature T_K1、T_K2.In method and step<110>, by these temperature T_K1、T_K2With corresponding initiation temperature T_LOK1、 T_LOK2It is compared.Intrinsic frequency adjusting is limited on the first ternary catalyzing unit 30 and will be by the second exhaust gas oxygensensor 42 first The lean mixture or rich mixture break-through by the first ternary catalyzing unit 30 recognized, which is considered as, needs to convert adjusting amplitude, also The conversion being somewhat below between the operation of stoichiometry and the operation of slightly above stoichiometry.

In method and step<120>, when internal combustion engine 10 continues to run, it is arranged in the another of 30 downstream of the first ternary catalyzing unit Outer exhaust gas after-treatment components 32,34,36 also heat up and reach their initiation temperature T_LOK2.If reaching the second ternary to urge Change the initiation temperature T on device 36_LOK2, then λ adjusting is expanded to third exhaust gas oxygensensor 44 and exhaust gas oxygensensor other when necessary.Logical Multiple ternary catalyzing units 30,36 are crossed to carry out that the particular/special requirement to exhaust after-treatment can be considered when intrinsic frequency adjusting.These are wanted Ask especially includes heating operation, the regeneration of particulate filter 32,34 or 30,32,34,36 and/or λ of exhaust gas after-treatment components sensing The diagnostic function of device 40,42,44.

If detecting 550 DEG C or more of member temperature of particulate filter 32,34 in method and step<130>, The soot intercepted in particulate filter can aoxidize.Thus in method and step<140>, by the way that the burning of internal combustion engine 10 is empty Gas mixture adjusts to the mixture for being higher than stoichiometry or by the way that auxiliary air input exhaust apparatus 20 is additional to provide Oxygen.The adjustment of parameter based on continuous λ measurement and control object, gas reach particulate filter by exhaust apparatus 20 32,34 transmission time is known and considers the gas in the amplitude pre-control to the running section for being higher than stoichiometry Transmission time.Once recognizing lean mixture break-through on second exhaust gas oxygensensor 42 in 30 downstream of the first ternary catalyzing unit, then in side In method step<150>, by certain additional oxygen amount input exhaust apparatus 20 and therefore make soot from particulate filter 32,34 Discharge.

Using HC absorber, the loading of HC absorber can equally be balanced and to be higher than stoichiometry Amplitude form be considered, to make HC adsorber regeneration.

Reference signs list

10 internal combustion engines

12 air inlets

14 combustion chambers

16 exhaust outlets

18 spark plugs

20 exhaust apparatus

22 exhaust-driven turbo-charger exhaust-gas turbo chargers

24 compressors

26 turbines

28 secondary air pumps

30 first ternary catalyzing units

32 diesel particulate filter devices

34 quaternary catalytic devices

36 second ternary catalyzing units

38 exhaust steam passages

40 first exhaust gas oxygensensors

42 second exhaust gas oxygensensors

44 third exhaust gas oxygensensors

46 first temperature sensors

48 second temperature sensors

50 controllers

52 signal wires

54 secondary air conduits

56 secondary air valves