CN110295983B - Purge alarm system and method for an exhaust gas treatment fluid reservoir of an SCR system - Google Patents
Purge alarm system and method for an exhaust gas treatment fluid reservoir of an SCR system Download PDFInfo
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- CN110295983B CN110295983B CN201810244648.1A CN201810244648A CN110295983B CN 110295983 B CN110295983 B CN 110295983B CN 201810244648 A CN201810244648 A CN 201810244648A CN 110295983 B CN110295983 B CN 110295983B
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- Prior art keywords
- treatment fluid
- exhaust treatment
- alarm
- total amount
- wash
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The application discloses a purge alarm system and method for an SCR system exhaust treatment fluid reservoir (100), the system comprising: an electronic control unit (700); and a detection device for monitoring an indicator relating to the total amount of exhaust treatment fluid consumed, wherein the electronic control unit (700) is in data communication with the detection device and records the monitored indicator, and wherein the electronic control unit (700) generates an alarm that the exhaust treatment fluid reservoir (100) needs to be purged after the recorded indicator reaches a prescribed limit.
Description
Technical Field
The present application relates to a purging alarm system and method for an exhaust treatment fluid reservoir of an SCR system for use in a diesel vehicle.
Background
For environmental reasons, Selective Catalytic Reduction (SCR) systems are widely used in diesel vehicles to treat engine exhaust. An SCR system typically comprises an exhaust treatment fluid reservoir, a booster pump, and an injection unit. An exhaust treatment liquid (e.g., an aqueous urea solution) stored in an exhaust treatment liquid storage is pressurized by a pressurizing pump, supplied to a nozzle of an injection unit, and injected into an engine exhaust pipe as needed, so as to react with nitrogen oxides in engine exhaust gas by an SCR catalyst of an SCR system disposed in the exhaust pipe to detoxify the nitrogen oxides and discharge the nitrogen oxides to the outside.
Due to the requirement for cleanliness of the exhaust treatment fluid, a filter is provided for the exhaust treatment fluid reservoir to ensure that the exhaust treatment fluid discharged from the reservoir meets cleanliness standards. Generally, when a diesel vehicle is manufactured and shipped, the exhaust treatment fluid in the exhaust treatment fluid storage is filled under strict environmental standards, and no pollutant is mixed in. However, the exhaust gas treatment liquid is a consumable product, and it is necessary to be added to the exhaust gas treatment liquid storage continuously during the entire life of the diesel vehicle. Therefore, in some harsh environments on site, there is a high possibility that contaminants such as particles or fibers are mixed into the exhaust treatment fluid storage during the process of replenishing the exhaust treatment fluid into the exhaust treatment fluid storage. The long-term accumulation of the mixed contaminants increases the burden on the filter, thereby shortening the service life of the filter and further affecting the service life of the nozzle.
Disclosure of Invention
The present application is directed to an improved measure that enables the use of filters of existing SCR systems to be relieved.
According to one aspect of the present application, there is provided a purge warning system for an SCR system exhaust treatment fluid reservoir, the system comprising: an electronic control unit; and a detection device for monitoring an indicator related to the total amount of exhaust treatment fluid consumed, wherein the electronic control unit is in data communication with the detection device and records the monitored indicator, and generates an alarm requiring cleaning of the exhaust treatment fluid reservoir after the recorded indicator reaches a prescribed limit.
According to another aspect of the present application, there is also provided a purge warning method for an SCR system exhaust treatment fluid storage, including:
monitoring and recording an index related to the total consumption of the exhaust treatment fluid; and is
An alarm is generated that requires cleaning of the exhaust treatment fluid reservoir after the recorded indicator reaches a specified limit.
Adopt the above-mentioned technical means of this application, can warn the user regularly to wash exhaust-gas treatment liquid memory, reduce the burden influence that the pollutant caused to the filter, and then can prolong the life of force (forcing) pump and nozzle.
Drawings
The foregoing and other aspects of the present application will be more fully understood from the following detailed description, taken together with the following drawings. It is noted that the drawings may not be to scale for clarity of illustration and will not detract from the understanding of the present application. In the drawings:
FIG. 1 schematically illustrates a component diagram of a portion of an SCR system according to an embodiment of the present application;
FIG. 2 schematically illustrates a flow chart of a method for purge management of an exhaust treatment fluid reservoir of an SCR system according to an embodiment of the present application; and
fig. 3 schematically shows a sequence of instructions for purge management of an exhaust treatment fluid reservoir of an SCR system according to an embodiment of the application.
Detailed Description
In the various figures of the present application, features that are structurally identical or functionally similar are denoted by the same reference numerals.
As shown in fig. 1, the SCR system for a diesel vehicle generally includes an exhaust treatment fluid storage 100, a pressurizing pump 300, and an injection unit 400. An exhaust treatment fluid such as an aqueous urea solution is stored in the exhaust treatment fluid storage 100. The exhaust gas treatment fluid reservoir 100 is provided with a filter 200, so that the exhaust gas treatment fluid must be filtered through the filter 200 after exiting the exhaust gas treatment fluid reservoir 100.
As shown, the exhaust treatment fluid reservoir 100 is in fluid communication with the booster pump 300 via a fluid line L100, and the injection unit 400 is in fluid communication with the booster pump 300 via a fluid line L200. The injection unit 400 has a nozzle (not shown) that extends at least partially into the exhaust pipe 500 of the diesel engine.
The SCR system further comprises an electronic control unit 700 in data connection with the booster pump 300 and the injection unit 400 for controlling both. For example, the electronic control unit 700 can selectively control the activation or deactivation of the pressurization pump 300 so that the exhaust treatment fluid is pressurized from the exhaust treatment fluid reservoir 100 and resides in the fluid line. The electronic control unit 700 can selectively control the opening and closing and/or the degree of opening and closing of the nozzle of the injection unit 400 so that a desired amount of high-pressure exhaust treatment fluid can be controllably injected into the exhaust pipe 500.
The exhaust treatment fluid reservoir 100 includes a charging port provided in the housing, which is sealed by a sealing cover 110. When the exhaust gas treatment liquid is added, the seal cap 110 is removed, and the exhaust gas treatment liquid is injected into the housing via the liquid addition port. As mentioned in the background section, in an environment outside the non-sealed room, it is highly likely that contaminants such as particles or fibers are also introduced into the exhaust treatment fluid storage 100 while the exhaust treatment fluid is being injected. Over time, the continued accumulation of pollutants within exhaust treatment fluid reservoir 100 may reduce the filtering effectiveness of filter 200. Thus, impure exhaust treatment fluid is likely to affect pump operation or even clog the nozzles of the injection unit 400, with even more adverse consequences.
According to one embodiment of the present application, the electronic control unit 700 may perform a reminder to record a fill event each time it receives an alarm signal that the liquid level of the liquid level sensor 600 is too low. When the total number of events recorded reaches a predetermined limit, the electronic control unit 700 may issue a warning alarm to a driver of the diesel vehicle, for example, issue a warning prompt on a vehicle-mounted display screen of the diesel vehicle, so as to remind the driver that the exhaust gas treatment liquid storage 100 needs to be removed for special cleaning, for example, the diesel vehicle is driven to a special place, and the exhaust gas treatment liquid storage 100 is cleaned in a clean and tidy environment, so as to completely eliminate pollutants accumulated in the housing of the exhaust gas treatment liquid storage 100.
Fig. 2 schematically shows a flow chart of a method for purging management of an exhaust gas treatment fluid reservoir of an SCR system according to an embodiment of the application. It will be apparent to those skilled in the art that the method may be implemented as computer program instructions stored in a data memory of the electronic control unit 700 and executed by the electronic control unit 700.
In step S100, the internal counter N is first cleared, i.e., N is equal to 0. Next, in step S200, after the liquid level sensor 600 determines that the liquid level of the exhaust gas treatment liquid in the exhaust gas treatment liquid storage 100 is insufficient, the internal counter N is incremented by one, that is, N is N + 1. Next, in step S300, it is determined whether N is greater than or equal to a predetermined limit NlimE.g. NlimAnd may be any integer greater than zero. If the determination result in step S300 is "no", it goes to step S200 to continue to increment the internal counter N by one after the liquid level sensor 600 determines that the liquid level of the exhaust gas treatment liquid in the exhaust gas treatment liquid storage 100 is insufficient. If the judgment result of the step S300 is YES, the flow goes to a step S400. In step S400, the electronic control unit 700 may issue a warning alarm to the driver of the diesel vehicle, indicating that the driver needs to clean the exhaust treatment fluid storage 100 in time. Then, the process goes to step S100 again. For example, electronic control unit 700 may cause the on-board display to display a message such as "need to clean the exhaust treatment fluid reservoir within the next 100 kilometers of travel". It should be clear to a person skilled in the art that the internal counter N can be manually cleared at any time by the driver of the diesel vehicle.
Fig. 3 schematically shows a sequence of commands for a purge management of an exhaust gas treatment fluid reservoir of an SCR system according to an embodiment of the application, wherein the abscissa L represents the amount of exhaust gas treatment fluid and the ordinate represents the internal counter N, it being seen that in the example shown, Nlim5. By adopting the technical means of the application, the waste gas treatment liquid storage 100 can be always cleaned in time after being filled with liquid for a specified number of times. Thus, the burden of the filter 200 by the pollutants accumulated inside the exhaust treatment liquid storage 100 is reduced, thereby increasing the long-term filtering effect and the service life of the filter 200 and significantly reducing the possibility of the pump operation failure rate or the nozzle clogging of the injection unit 400.
In another alternative embodiment according to the present application, a flow sensor may be provided with filter 200 to monitor the flow through filter 200. The flow sensor may be in data communication with the electronic control unit 700. In this way, the flow sensor may continuously monitor the total amount of flow through filter 200 whether exhaust treatment fluid reservoir 100 is filled or not. In this alternative embodiment, it may be arranged that, after the monitored total amount of exhaust treatment fluid flowing through the filter 200 reaches a certain limit, the electronic control unit 700 may issue a warning alarm to the driver of the diesel vehicle, indicating that the driver needs to clean the exhaust treatment fluid storage 100 in time. Then, after the alarm is given, the electronic control unit 700 again monitors and records the total flow through the filter 200 from zero.
That is, the present application focuses on an index relating to the total amount of exhaust treatment fluid consumed, which index is associated with the number of events related to the filling of the exhaust treatment fluid into the exhaust treatment fluid storage 100 and/or the total amount of exhaust treatment fluid passing through the filter 200.
In an alternative embodiment, the level sensor 600 may be configured to monitor the total amount of exhaust treatment fluid filled into the exhaust treatment fluid storage 100, which may also be used as a parameter to evaluate the above-mentioned indicator related to the total amount of exhaust treatment fluid consumed.
Thus, based on the described embodiments, the present application provides a purge alarm system for an SCR system exhaust treatment fluid storage 100, the system comprising: an electronic control unit 700; and a sensing device for monitoring an index related to the total amount of exhaust treatment fluid consumed, wherein the electronic control unit 700 is in data communication with the sensing device and records the monitored index, and after the recorded index reaches a prescribed limit, the electronic control unit 700 alerts (to a user of the SCR system) that the exhaust treatment fluid reservoir 100 needs to be cleaned.
In the context of the present application, the event associated with filling the exhaust treatment fluid reservoir 100 with exhaust treatment fluid may be any event associated with the sealing lid 110 of the exhaust treatment fluid reservoir 100 being and/or having been opened. The event may include a fluid level in the exhaust treatment fluid reservoir 100 being too low (such that the sealing cap 110 of the exhaust treatment fluid reservoir 100 is about to be opened for fluid replacement). Alternatively, the event may include a process in which the sealing cap 110 of the exhaust treatment fluid storage 100 has been opened for fluid replacement. Alternatively, the event may include an increase in the level of the exhaust treatment fluid reservoir 100.
In the embodiment of fig. 1, the detection device may be a liquid level sensor 600 or a flow sensor. However, it will be clear to a person skilled in the art that the above-described detection means may also be implemented in other ways. For example, in an alternative embodiment, the detection device may be a detection circuit of the exhaust treatment fluid storage 100, which is disposed near the sealing cover 110, and is used for detecting an opening event of the sealing cover 110, so as to infer whether the exhaust treatment fluid storage 100 is filled with the exhaust treatment fluid. In an alternative embodiment, the detection device may be a wireless switch configured to seal cover 110 of exhaust treatment fluid reservoir 100. Opening the sealing cap 110 entails activating the wireless switch to send the electronic control unit 700 a detection event of filling the exhaust treatment fluid reservoir 100 with exhaust treatment fluid.
Here, the present application also provides a purge management method for an SCR system exhaust treatment fluid storage 100, including:
monitoring and recording an index related to the total consumption of the exhaust treatment fluid; and
after the recorded indicator relating to the total amount of exhaust treatment fluid consumed reaches a prescribed limit, an alarm is generated (to a user of the SCR system) that the exhaust treatment fluid reservoir 100 needs to be cleaned.
Although specific embodiments of the present application have been described herein in detail, they have been presented for purposes of illustration only and are not to be construed as limiting the scope of the application. Further, it should be clear to those skilled in the art that the various embodiments described in this specification can be used in combination with each other. Various substitutions, alterations, and modifications may be conceived without departing from the spirit and scope of the present application.
Claims (31)
1. A purge alarm system for an SCR system exhaust treatment fluid storage reservoir (100), the system comprising: an electronic control unit (700); and a detection device for monitoring an indicator relating to the total amount of exhaust treatment fluid consumed, wherein the electronic control unit (700) is in data communication with the detection device and records the monitored indicator, and wherein the electronic control unit (700) generates an alarm that the exhaust treatment fluid reservoir (100) needs to be cleaned after the recorded indicator reaches a prescribed limit, the indicator relating to the total amount of exhaust treatment fluid consumed being associated with the number of events relating to the filling of the exhaust treatment fluid reservoir (100) with exhaust treatment fluid.
2. The purge alarm system of claim 1, wherein the event associated with filling the exhaust treatment fluid reservoir (100) with exhaust treatment fluid comprises a fluid level within the exhaust treatment fluid reservoir (100) being below a predetermined value.
3. A wash alarm system according to claim 1 or 2, characterised in that the event relating to filling the exhaust treatment fluid reservoir (100) with exhaust treatment fluid comprises opening of a sealing cover (110) of the exhaust treatment fluid reservoir (100).
4. Washing alarm system according to claim 1 or 2, characterised in that the number of events (N) recorded reaches a defined value (N)lim) The electronic control unit (700) then generates an alarm that the exhaust treatment fluid reservoir (100) needs to be cleaned.
5. The wash alarm system according to claim 2, characterized in that the detection means comprise a level sensor (600) arranged in the exhaust treatment fluid reservoir (100).
6. A cleaning alarm system according to claim 1, characterised in that the reservoir (100) is in fluid communication with a filter (200) and that the indicator relating to the total amount of consumption of exhaust treatment fluid is associated with the total amount of flow through the filter (200).
7. The purge alarm system according to claim 1 or 2, wherein the electronic control unit (700) re-records the indicator related to the total amount of exhaust treatment fluid consumed starting from zero after the alarm is issued.
8. A washing alert system as claimed in claim 1 or claim 2 further comprising a display screen for displaying the alert.
9. The purging alarm system according to claim 3, characterized in that the electronic control unit (700) generates an alarm that the exhaust treatment fluid reservoir (100) needs to be purged after the number of recorded events (N) reaches a prescribed value (Nlim).
10. A washing alert system according to claim 3, characterised in that after the alert has been issued the electronic control unit (700) re-registers the indicator relating to the total amount of exhaust treatment liquid consumed from scratch.
11. The wash alarm system according to claim 4, characterised in that after the alarm has been set off, the electronic control unit (700) re-registers from scratch the indicator relating to the total amount of exhaust treatment fluid consumed.
12. The wash alarm system according to claim 5, characterised in that after the alarm has been set off, the electronic control unit (700) re-registers from scratch the indicator relating to the total amount of exhaust treatment fluid consumed.
13. A wash alarm system according to claim 3, further comprising a display screen for displaying the alarm.
14. The wash alarm system of claim 4, further comprising a display screen for displaying the alarm.
15. The wash alarm system of claim 5, further comprising a display screen for displaying the alarm.
16. The wash alarm system of claim 6, further comprising a display screen for displaying the alarm.
17. A purge alarm method for an SCR system exhaust treatment fluid storage (100), comprising:
monitoring and recording an index related to the total consumption of the exhaust treatment fluid; and is
-generating an alarm requiring the cleaning of the exhaust treatment fluid storage (100) after the recorded indicator reaches a prescribed limit, the indicator relating to the total amount of exhaust treatment fluid consumed being associated with the number of events relating to the filling of the exhaust treatment fluid storage (100) with exhaust treatment fluid.
18. The wash alert method according to claim 17, wherein the event related to filling the exhaust treatment fluid reservoir (100) with exhaust treatment fluid comprises a fluid level in the exhaust treatment fluid reservoir (100) being below a predetermined value.
19. The purging alarm method according to claim 17 or 18, characterized in that the event related to the filling of the exhaust treatment fluid storage (100) with exhaust treatment fluid comprises the opening of a sealing cover (110) of the exhaust treatment fluid storage (100).
20. Washing alert method according to claim 17 or 18, characterised in that the number of events (N) recorded reaches a specified value (N)lim) Thereafter, the electronic control unit (700) generates an alarm that the exhaust treatment fluid reservoir (100) needs to be cleaned.
21. The wash alarm method according to claim 18, characterized in that the event related to filling the exhaust treatment fluid reservoir (100) with exhaust treatment fluid is carried out with a fluid level sensor (600) arranged in the exhaust treatment fluid reservoir (100).
22. A wash alert method as claimed in claim 17 or 18, characterised in that the exhaust treatment fluid reservoir (100) is in fluid communication with a filter (200) and the indicator relating to the total amount of exhaust treatment fluid consumed is related to the total amount of flow through the filter (200).
23. The cleaning warning method according to claim 17 or 18, characterized in that after the alarm is issued, the index relating to the total amount of exhaust treatment liquid consumed is recorded again from zero.
24. A wash alert method as claimed in claim 19, characterised in that the number of events (N) recorded reaches a specified value (N)lim) Thereafter, the electronic control unit (700) generates an alarm that the exhaust treatment fluid reservoir (100) needs to be cleaned.
25. A wash alert method as claimed in claim 19, wherein the exhaust treatment fluid reservoir (100) is in fluid communication with a filter (200), and the indicator relating to the total amount of exhaust treatment fluid consumed is associated with the total amount of flow through the filter (200).
26. A wash alert method as claimed in claim 20, characterised in that the exhaust treatment fluid reservoir (100) is in fluid communication with a filter (200) and the indicator relating to the total amount of exhaust treatment fluid consumed is associated with the total amount of flow through the filter (200).
27. A wash alert method as claimed in claim 21, characterised in that the exhaust treatment fluid reservoir (100) is in fluid communication with a filter (200) and the indicator relating to the total amount of exhaust treatment fluid consumed is related to the total amount of flow through the filter (200).
28. The wash alarm method according to claim 19, wherein the recording of the indicator relating to the total amount of exhaust treatment fluid consumed is resumed from zero after the alarm is raised.
29. The wash alarm method according to claim 20, wherein the recording of the indicator relating to the total amount of exhaust treatment fluid consumed is resumed from zero after the alarm is raised.
30. The wash alarm method according to claim 21, wherein the recording of the indicator relating to the total amount of exhaust treatment fluid consumed is resumed from zero after the alarm is raised.
31. The wash alarm method according to claim 22, wherein the recording of the indicator relating to the total amount of exhaust treatment fluid consumed is resumed from zero after the alarm is raised.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810244648.1A CN110295983B (en) | 2018-03-23 | 2018-03-23 | Purge alarm system and method for an exhaust gas treatment fluid reservoir of an SCR system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810244648.1A CN110295983B (en) | 2018-03-23 | 2018-03-23 | Purge alarm system and method for an exhaust gas treatment fluid reservoir of an SCR system |
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| CN110295983A CN110295983A (en) | 2019-10-01 |
| CN110295983B true CN110295983B (en) | 2022-07-08 |
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| CN110295983A (en) | 2019-10-01 |
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