阅读说明：本技术 用于预期地维护输送及配量系统的过滤器的方法 (Method for expectedly safeguarding the filter of conveying and dosing system ) 是由 V.丹拉杰 S.泽尔滨 T.洛伦茨 于 2019-05-23 设计创作，主要内容包括：本发明涉及一种用于预期地维护SCR系统中的输送及配量系统的过滤器的方法。在该方法中,将所获取的关于SCR系统的材料特性和/或工作特征的数据(WDe)与通过无线电连接能够调用的参考数据(WDr)进行比较(105),所述参考数据包括关于SCR系统的、在不同的系统条件下的材料特性和/或工作特征的信息。在这种比较(105)的基础上,设定(107、109)对于所述过滤器的纠正性维护的执行和时刻。(The present invention relates to a kind of methods for expectedly safeguarding the conveying in SCR system and the filter of dosing system.In the method, the acquired material property about SCR system and/or the data (WDe) of operating characteristic are compared (105) with the reference data (WDr) that can be called by radio connection, the reference data includes the information of material property about SCR system, under different system conditions and/or operating characteristic.On the basis of this comparison (105), the execution and moment of (107,109) for the corrective maintenance of the filter are set.)

1. a kind of method, filter (17) of this method for conveying and dosing system (1) in expectedly maintenance SCR system, Wherein by the acquired material property about the SCR system and/or the data (WDe) of operating characteristic and pass through radio connection The reference data (WDr) that can be called is compared (105), the reference data include it is about SCR system, in different be The information of material property and/or operating characteristic under the conditions of system, and on the basis of the comparison (105) setting (107, 109) execution for the corrective maintenance of the filter (17) and moment.

2. the method according to claim 1, wherein if at least part of acquired data (WDe) is high It is in threshold value (S) identified from the reference data (WDr), then pre- in the filter (17) and/or the SCR system Survey is that nonfunctional ability or failure set (107) described corrective maintenance before.

3. method according to claim 1 or 2, which is characterized in that if acquired data (WDe) are extremely Few a part is lower than the identified threshold value (S) from the reference data (WDr) or corresponds to the threshold value (S), then will be (109) later moment is postponed till in the corrective maintenance being arranged within predetermined service intervals.

4. the method according to any one of Claims 2 or 3, which is characterized in that the threshold value (S) represents the conveying And dosing system (1) due to the filter that wears and/or block without Functional Capability and from characterizing the filter (17) (104) are calculated in the system parameter of abrasion and/or blocking.

5. method according to any of the preceding claims, which is characterized in that acquired data (WDe) are from following One or more of source:

The rate of pumping of the delivery pump (11) of the conveying and dosing system (1)；

The stress level in filter (17) downstream；

Until reaching specific stress level elapsed time in the filter (17) downstream；

The conveying and dosing system, in the filter (17) downstream reaching the total current of specific stress level Consumption；

For motivating the parameter of the conveying and dosing system (1).

6. method according to any of the preceding claims, which is characterized in that the reference data (WDr) is employed previously Safeguard the record of (102).

7. method according to any of the preceding claims, which is characterized in that the reference data (WDr) employs model (101).

8. the method according to the description of claim 7 is characterized in that improving the model by acquired data (WDr) (101).

9. method according to any of the preceding claims, which is characterized in that the radio connection is wireless mutual Networking connection.

10. a kind of computer program, which is arranged for executing according to claim 1 to described in any one of 9 Method.

11. the storage medium that one kind can be machine-readable, is stored with computer program according to claim 10 above it.

12. a kind of electronic controller (6), the electronic controller are arranged for, by means of according to claim 1 to any in 9 Method described at least partly controls the expected maintenance of the filter (17) of conveying and dosing system (1).

13. electronic controller according to claim 12, which is characterized in that material acquired, about the SCR system Material characteristic and/or the data (WDr) of operating characteristic can be stored on the electronic controller (6).

14. a kind of cloud computing unit (7), the cloud computing unit are arranged for, by means of according to claim 1 to any in 9 Method described at least partly controls the expected maintenance of the filter (17) of conveying and dosing system (1).

15. cloud computing unit (7) according to claim 14, which is characterized in that reference data can be stored in the cloud On computing unit (7) and can by its calling, the reference data include it is about SCR system, in different system conditions Under material property and/or operating characteristic information.

Technical field

The present invention relates to a kind of methods for expectedly safeguarding the conveying in SCR system and the filter of dosing system. In addition, the computer program implements the method when it runs on the computing device the present invention relates to a kind of computer program Each step, and the present invention relates to a kind of storage medium that can be machine-readable, which stores the computer journey Sequence.Finally, the electronic controller is arranged at least partly implementing according to this hair the present invention relates to a kind of electronic controller Bright method, and the present invention relates to a kind of cloud computing unit, which is arranged at least partly implementing root According to method of the invention.

Background technique

At present when the exhaust gas to internal combustion engine is post-processed using SCR method (Selective CatalyticREduction(selective catalytic reduction)), for restoring the nitrogen oxides (NOx) in exhaust gas.DE 103 46 220 A1 Illustrate the principle on basis.It is people institute that 32.5% urea-water-solution (HWL)-is commercially also used as to AdBlue herein Know-be incorporated in the exhaust gas.It is typically provided with conveying and dosing system with metering valve thus, for urging in SCR The HWL is incorporated into waste gas stream the upstream for changing device.Ammonia is cracked out from the HWL, the ammonia is then catalyzed in the SCR Chemical combination at the surface of the reaction of device.There, the ammonia reacts with the nitrogen oxides, therefrom generates water and nitrogen.By The HWL is conveyed to metering valve by pressure piping from reducing agent storage tank in the conveyor module with delivery pump.The conveying Module forms pressure herein and maintains the pressure, until being incorporated HWL by metering valve.

In general, filter is arranged in the exit towards pressure piping of the conveyor module, so that HWL passes through filter It is conveyed to metering valve.Foreign particle in HWL may block the metering valve as such as dirt and have to the metering valve Evil, it is therefore necessary to the metering valve is protected by filter, against the influence of these foreign particles.The filter is used for These foreign particles are filtered out from HWL before HWL flows through metering valve.In order to realize the high deposition of foreign particle, institute Filter is stated with big surface, the surface has a filtering coatings, such as special resinous coat, the filtering coatings with HWL is in contact.Foreign particle is loaded to the filter by filtering.The filter must be replaced often.This is usually being tieed up It repairs in a service process and carries out.

A kind of method for determining the load of filter is disclosed from 10 2,012 201 595 A1 of DE.It is known Method regulation determines that the load of filter, the pressure sensor measure on filter by means of additional pressure sensor The pressure of trip.In described method, current measurement is executed to the pump electric current of delivery pump and is inferred from the pump electric current Pressure drop on the filter out.Then, the load of the filter can be obtained from the pressure difference generated herein.

Summary of the invention

Propose a kind of method for expectedly safeguarding the conveying in SCR system and the filter of dosing system.It is described Filter is arranged between dosage module and conveyor module in pressure piping, particularly in the exit of conveyor module.It is described Conveyor module has delivery pump, which is transported to dosage module by filter from reducing agent storage tank for reducing agent solution In, then it is incorporated in the exhaust system of internal combustion engine by metering valve there.The filter by foreign particle, especially Dirt is filtered out from reducing agent solution, so that the metering valve is not blocked by foreign particle.By external received Grain, the filter may block itself, so that reducing agent can not be supplied to metering valve in an adequate manner again.This Outside, the filter can be subjected to the abrasion as caused by aging, so that its effectiveness reduces over time.

Data of the expected maintenance (predictive maintenance) in the acquired current state for showing component And reflection component or comparing component abrasion condition reference data on the basis of regulation for corrective maintenance plan, Corresponding component is maintained or replaced in the corrective maintenance.Thus the unexpected failure during operation is reduced.For this purpose, will Acquired is compared about the material property of SCR system and/or the data of operating characteristic with reference data, the reference number According to the information for including material property about SCR system, under different system conditions and/or operating characteristic.Acquired Data are the current datas of SCR system, and abrasion and/or blocking about filter is allowed to draw a conclusion.Acquired data It can be measured and be analyzed by electronic controller and stored.Below to acquired data, preferred next The example in source is inquired into.The reference data can at least pass through radio connection in order to carry out the comparison, preferably lead to Wireless internet is crossed to connect to call.For this purpose, having been detected by the reference data in advance and storing it in cloud computing On unit.It is further possible to by the reference data such as intermediate storage in electronic controller and to be compared and adjusting With.

On the basis of this comparison, the corrective maintenance of execution and moment to(for) the filter are set.The ratio Relatively itself it can either be executed or can be executed by the cloud computing unit by the electronic controller.It also can be institute It states to compare and is combined calculating.On the basis of the expected maintenance of the filter, the correction of the filter can be planned Property maintenance.This, which is provided, can be realized the advantages of less and shorter maintenace point stops.Other advantages are to improve making for filter With the service life, the failure safety of SCR system is improved, the accident adversely affected to environment is reduced and most preferably processing can The accessory provided in the case where accurately mutually coordinating with corrective maintenance.

At least part of acquired data is higher than for from threshold value such case identified in reference data, It provides on one side, sets corrective maintenance before filter and/or SCR system are predicted to be nonfunctional ability or failure. Thereby, it is possible to so plan the maintenance of the filter or replacement, thus SCR system the mode of action by too strong Influence or even carry out before failure the maintenance or replacement for the filter.

If at least part of acquired data is not higher than threshold value, can purely exist in a conventional manner in principle By executing corrective maintenance, the i.e. maintenance for filter at the time of service intervals defined or replacing.For following this feelings At least part of data acquired in for condition is lower than or corresponding to the threshold value determined from reference data, in this case Advantageously by the filter, the corrective maintenance that is arranged within predetermined service intervals postpone till later when It carves.Since the filter is assessed as functional ability in this case, so the maintenance for filter can be abandoned And replacement.The interval between corrective maintenance is extended on the basis of expected maintenance as a result,.

For above-mentioned two situations, it is preferable to use identical threshold value, therefore only have to from reference data disposably Determine the threshold value.Preferably, this threshold value represent the conveying and dosing system due to wearing and/or blocking and just There is no the filters of Functional Capability.Then described in capable of being calculated from the system parameter of abrasion and/or the blocking of characterization filter Threshold value.Using the threshold value, can accurately be distinguished between the filter and defective filter of functional ability.This The system parameter of sample is such as:

The reducing agent quality being all incorporated, it is being loaded into delivery pump, is more precisely being loaded into for pumping about the time It is sought on the basis of duty ratio (Tastverh ltnis) on the control mechanism of motor；

The running temperature of conveyor module；

The change curve of the pressure of filter downstream, particularly its history and in the pressure peak wherein occurred；

System start number；

In order to form the time required for pressure during starting；

The hours of operation of SCR system；

The duty ratio of delivery pump in the known constant reducing agent solution of no supplying or supplying.

Acquired data are preferred from one or more of following source:

Reducing agent solution pumping is passed through filter with the rate of pumping by the rate of pumping of the delivery pump of conveying and dosing system It is pumped to metering valve；

The stress level of filter downstream；

Until reaching specific stress level elapsed time in filter downstream；

Conveying and dosing system, total current drain for reaching specific stress level in filter downstream；

For motivating the parameter of conveying and dosing system, as such as motivating the pump electric current of delivery pump.

As already described, reducing agent solution is conveyed to pressure valve by filter by the delivery pump.Therefore, mistake The pressure in filter downstream is the index of abrasion and/or the blocking of filter.The pressure can pass through the pressure of filter downstream Sensor measures.As an alternative, pressure drop can be inferred to from the current measurement of the pump electric current of delivery pump, the pressure Drop is the index of abrasion and/or the blocking for the filter in turn.Therefore, acquired data can be directly measured, It either can be indirectly from obtaining acquired data in measured numerical value or from the parameter of setting.Acquired data It can be detected and be handled by the electronic controller first and stored by it.

It is described below and how to obtain reference data.The reference data can employ the record of pervious maintenance.In This described record can be related to used SCR system or be related to comparison system.Currently used system can also be passed through To supplement the record about comparison system.The record has about used SCR system and/or comparison system, In The information of material property and/or operating characteristic under different system conditions, and more particularly to including the filter, In State when maintenance and/or replacement.The record is stored on cloud computing unit and can be by its calling.

As an alternative or additional project, the reference data can employ model.In this case, to SCR System, material property under different system conditions and/or operating characteristic modeled.Calculating for model can be It is carried out on cloud computing unit.The model can be improved by the acquired data of used system herein.

Computer program is arranged for: the method is executed, especially if in electronic controller or computing unit, spy It is not that the computer program is executed on cloud computing unit.In this case, the computer program can be in the control A part of step is executed on device and the other part of step is executed on the computing unit.In order to especially described Electronic controller is implemented, and the computer program is stored on machine-readable storage medium.

The electronic controller is arranged for, and the conveying and dosage system are at least partly controlled by means of the above method The expected maintenance of the filter of system.Here, the electronic controller can detect first and handle acquired data.Separately Outside, the electronic controller can store it is acquired, about the material property of SCR system and/or the data of operating characteristic.

It is proposed a kind of cloud computing unit, which is arranged for, and is at least partly controlled by means of the above method Make the expected maintenance of the filter of the conveying and dosing system.Here, the cloud computing unit can acquire first and Handle reference data.In addition, the cloud computing unit can store reference data, the reference data includes about SCR system , the information of material property and/or operating characteristic under different system conditions.Finally, the reference data can be by institute Cloud computing unit is stated preferably via radio connection, particularly wireless internet connection to call.

The electronic controller and the cloud computing unit via radio connection, particularly can pass through wireless interconnection Net connection is connected to each other.By this radio connection, the electronic controller can be called from the cloud computing unit Reference data.In turn, the cloud computing unit can call acquired data from the electronic controller.For data Comparison can either be executed by the electronic controller or can be executed and then be led to by the cloud computing unit The radio connection is crossed to provide.

Detailed description of the invention

The embodiment of the present invention is shown in the accompanying drawings and is explained in detail in the following description.

Fig. 1 shows the schematical structure of the SCR system with filter, wherein according to one according to the method for the present invention Embodiment is planted to execute expected maintenance.

Fig. 2 shows a kind of flow charts of embodiment according to the method for the present invention.

Specific embodiment

Fig. 1 shows the schematical structure of SCR system, which has for being not shown in motor vehicles Internal combustion engine carry out exhaust after-treatment SCR catalyst 2 and oxidation catalyzer 3 conveying and dosing system 1.The oxidation is urged Change device 3 and SCR catalyst 2 is sequentially arranged in the exhaust system 4 of internal combustion engine and acts on exhaust gas exhausted from the internal combustion engine.Institute Stating conveying and dosing system 1 has the conveyor module 10 with delivery pump 11, and the delivery pump is by reducing agent solution via conveying Pipeline 13 is delivered to metering valve 14 from reducing agent storage tank 12 and via pressure piping 15.It then, will by the metering valve 14 Reducing agent solution is incorporated into the exhaust system 4 of 2 upstream of SCR catalyst.The reducing agent solution not being incorporated is via return line 16 It flow back into the reducing agent storage tank 12.

In the pressure piping 15, filter 17 is arranged in the exit of conveyor module 10, and the filter is to reduction Agent solution is filtered and removes foreign particle, particularly dirt from reducing agent solution at this.The filter 17 has It is coated with the big surface of resinous coat and foreign particle is received with filter medium by this surface.Here, the filtering The load of device 17 increases.If the load of the filter 17 is too high, the filter 17 may be blocked up by foreign particle Plug.In addition, the filter 17 is subjected to the abrasion as caused by aging.Therefore, it is necessary to the filter 17 is maintained or replaced often, To ensure the Functional Capability of conveying and dosing system 1.The filter 17 usually has heating element not shown here, described The reducing agent solution that heating element is used to that reducing agent solution to be made not freeze or freeze quickly thaws.

It provides herein, determines the pressure drop on the filter 17, for concluding therefrom that the negative of the filter 17 Lotus.Two kinds are shown in FIG. 1 for seeking the feasible program of pressure drop.It on the one hand, can be in the pressure in 17 downstream of filter Pressure sensor 50 is set in pipeline 15, the pressure in the pressure piping is measured by the pressure sensor.On the other hand, Current measurement meter 51 can measure the electric current for being fed to delivery pump 11.It can therefrom determine on filter 17 in known manner Pressure drop and the load for being finally inferred to filter 17.Pressure drop and load are sought carrying out on electronic controller 6, The electronic controller is connected with the pressure sensor 50 and/or the current measurement meter 51.Acquired data are by described Electronic controller 6 is detected and is stored.

Furthermore the computer network for being provided with cloud computing unit 7, for example possessing wireless internet connection.The cloud computing Unit 7 is arranged for storing and provide reference data, the reference data include it is about SCR system, different The information of material property and/or operating characteristic under system condition.For the more detailed description of the reference data, With reference to the description as described in Fig. 2.The electronic controller 6 is arranged at least calling the reference number from cloud computing unit 7 According to.For this purpose, the electronic controller 6 is connected with receiver 61, the receiver can by wireless radio connection from Reference data is received at the cloud computing unit 7 and forwards it to the electronic controller 6.In a kind of preferred embodiment In, the wireless radio connection is wireless internet connection, wherein the electronic controller 6 can pass through " cloud computing To access the cloud computing unit 7.The receiver 61 can be integrated into the electronic controller 6 in another embodiment In either part of it.In addition, the receiver 61 can also be configured to transceiver, namely be configured to receiver and transmission The combination of device enables acquired data to be sent to the cloud computing unit 7.In a further embodiment, it provides Additional transmitter for being communicated with the cloud computing unit 7.

Fig. 2 shows a kind of flow charts of embodiment according to the method for the present invention.In first step 100, obtain It is current acquired, about the material property of SCR system and/or the data WDe of operating characteristic, allow the mill about filter Damage and/or blocking are drawn a conclusion.Acquired data WDe is originated from one or more of following source herein:

The rate of pumping of the delivery pump 11 of the conveyor module 10 of conveying and dosing system 1, it is with the rate of pumping that reducing agent is molten Liquid is pumped to metering valve 14 by filter 17；

17 downstream of filter, the stress level that is measured by pressure sensor 50；

In 17 downstream of filter until reaching the specific stress level elapsed time measured by pressure sensor 50；

In filter downstream in order to reach the specific stress level measured by pressure sensor 50, the conveying and dosage System 1 passes through total current drain measured by current measurement meter 51；

In order to motivate the delivery pump 11 of the conveyor module 10 to pass through pump electric current measured by the current measurement meter 51.

The first step 100 is implemented by the electronic controller 6.

In another step 103, from acquisition reference data WDr, the ginseng in the record of model 101 and previous maintenance 102 Examine the information that data include material property about SCR system, under different system conditions and/or operating characteristic.Another In one step 104, threshold value S is obtained from the reference data WDr.Threshold value S represent it is described conveying and dosing system 1, Due to wearing and/or blocking without the filter of Functional Capability.For this purpose, calculating the threshold value S, the system from system parameter The abrasion and/or blocking of system parameter characterization filter.These system parameters include:

All reducing agent quality for being incorporated, it (does not show for the pump motor of the delivery pump 11 about the time being loaded into It is sought on the basis of the duty ratio on control mechanism out)；

The running temperature of conveyor module 10；

17 downstream of filter, the change curve of pressure that is measured by pressure sensor 50 occurs together with its history and wherein Pressure peak；

System start number；

It is to form the time required for pressure during starting；

The hours of operation of SCR system；

The duty ratio of delivery pump 11 in no supplying reducing agent solution.

Implement or calculate step 103 and 104 and model 101 on the cloud computing unit 7.Step 103 and 104 and Model 101 have been able in advance, namely obtain acquired data WDe in step 100 before implemented, and then Reference data WDr and threshold value S can be stored on the cloud computing unit 7.The record of previous maintenance 102 is equally stored In the cloud computing unit 7 and it can be updated.In addition, the mould can be improved by acquired data WDe Type 101.For this purpose, by the electronic controller 6 by wireless radio connection (internet connection) by acquired data WDe It is sent to the cloud computing unit 7.

On the electronic controller 6 and it can not only can implement subsequent step on the cloud computing unit 7.It holds The acquired data WDe of row is checked simultaneously 105 compared with threshold value S.If at least the one of acquired data WDe Part is higher than threshold value S, that is if the abrasion and/or blocking of the filter 17 are higher than by from the reference value WDr Representated by acquired threshold value S, the abrasion and/or blocking of the SCR catalyst of nonfunctional ability, then no matter maintenace point service is It is no that 106 corrective maintenances will be set in service intervals.Nothing is predicted to be in the filter 17 and/or the SCR system Before Functional Capability or failure, at the time of setting 106 corrective maintenance.In the corrective maintenance, in maintenace point service The filter 17 is repaired or replaced in range.

If the comparison 105 shows acquired data WDe lower than threshold value S or corresponds to threshold value S, not strong It sets up and determines corrective maintenance.On the contrary, being thought of as the predetermined service intervals of filter 17.If the inquiry in service intervals For the filter 17 currently without the service that provides, namely without offer corrective maintenance in 108, then according to according to this The method of invention does not execute 108 corrective maintenances.If being provided according to the inquiry 107 in service intervals has for filter 17 Corrective maintenance service, then according to 109 later moments are postponed till in the service according to the method for the present invention.

As already described, the filter 17 usually has heating element.Being maintained in for heating element is not depended on Get off in the case where maintenance of filter 17 execution.Therefore, individual service intervals are assigned for the heating element.If Regulation should execute the service for heating element according to service intervals in inquiry 110, then be not dependent on the comparison 105 In the case where set corrective maintenance 106.If the service of the heating element is used for currently without offer according to inquiry 110, Then implement the comparison 105 as described.