CN110284948A - A kind of control method of SCR system - Google Patents
A kind of control method of SCR system Download PDFInfo
- Publication number
- CN110284948A CN110284948A CN201910581113.8A CN201910581113A CN110284948A CN 110284948 A CN110284948 A CN 110284948A CN 201910581113 A CN201910581113 A CN 201910581113A CN 110284948 A CN110284948 A CN 110284948A
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- Prior art keywords
- urea pump
- scr system
- timing
- urea
- control method
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Classifications
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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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
-
- 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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- 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
-
- 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
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
- F01N2610/144—Control thereof
-
- 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
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
-
- 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
- Y02T10/12—Improving ICE efficiencies
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
This application discloses a kind of control methods of SCR system, comprising the following steps: 11) judges whether the urea pump of SCR system needs to thaw, if so, heating to urea pump, complete until urea pump thaws；12) start timing while urea pump thaws and completes；13) urea pump stops timing after receiving enabling signal, judges whether timing duration is equal to or more than preset duration, if so, forbidding urea pump startup.The control method of above-mentioned SCR system; due to after the completion of urea pump thaws, before being started; it can be derived that whether urea pump is freezed by secondary by way of judging to be spaced duration; if not secondary freeze; then urea pump can be directly initiated when receiving enabling signal; freeze in case of secondary; urea pump startup can then be forbidden; to be protected to urea pump; frozen urea pump is avoided to directly initiate and damage; the normal work that preferably ensure that urea pump, improves the working performance of SCR system.
Description
Technical field
The present invention relates to technical field of engines, in particular to a kind of control method of SCR system.
Background technique
When environment temperature is relatively low, the urea liquid in SCR system can freeze, thus just need to urea pump, urea box,
The components such as urea tube and urea nozzle are heated so that its internal urea liquid thaws, when these components temperature all on
After being raised to predetermined temperature, i.e., after the completion of the urea liquid in all parts thaws, SCR system can just be made to enter normal work shape
State.
When being thawed, the used time that urea pump thaws is shorter, generally thaws and completes prior to other component, urea pump solution
Other component can be waited to thaw after the completion of jelly, the temperature of urea pump will not be detected again in waiting process, when whole component solutions
After the completion of jelly, ECU issues enabling signal, and each component starts cooperating to realize the injection of urea liquid.But actual
In course of defrosting, it some times happens that the case where urea pump waits other component to freeze again when thawing after the completion of defrosting, if
Urea pump is directly driven at this time then probably will cause the damage of urea pump.
Summary of the invention
In view of this, can be avoided the urea after the completion of thawing the present invention provides a kind of control method of SCR system
Pump is damaged when starting because freezing again, preferably ensure that the normal work of urea pump.
In order to achieve the above object, the invention provides the following technical scheme:
A kind of control method of SCR system, comprising the following steps:
11) judge whether the urea pump of SCR system needs to thaw, if so, heating to the urea pump, until institute
Urea pump defrosting is stated to complete；
12) start timing while the urea pump thaws and completes；
13) urea pump stops timing after receiving enabling signal, judges whether timing duration is equal to or more than preset
Duration, if so, forbidding the urea pump startup.
Preferably, further comprising the steps of in the control method of above-mentioned SCR system:
14) step 11) and step 12) are repeated；
15) urea pump stops timing after receiving enabling signal again, and judges whether the duration of timing again is small
In the preset duration, if so, starting the urea pump.
Preferably, in the control method of above-mentioned SCR system, step 11) includes:
111) temperature measurement is carried out to the urea pump, and judges whether the temperature measured is lower than thaw point, if so,
The urea pump is heated；
112) temperature measurement persistently is carried out to the urea pump being heated, and whether the temperature that real-time judge measures is equal to
Or it is higher than the thaw point, if so, stopping heating, the urea pump, which thaws, to be completed.
Preferably, in the control method of above-mentioned SCR system, step 12) specifically:
Whether urea pump described in real-time detection, which stops, being heated, if so, starting timing.
Preferably, in the control method of above-mentioned SCR system, step 13) includes:
131) judge whether the urea pump receives the enabling signal, if so, stopping timing and carrying out the meter
The judgement of Shi Shichang；
132) when the timing duration is equal to or more than the preset duration, the temperature of the urea pump is detected again,
And judge whether the temperature measured is lower than the thaw point again, if so, forbidding the urea pump startup.
The control method of SCR system provided by the invention, due to passing through after the completion of urea pump thaws, before being started
Judge that the mode for being spaced duration can be derived that whether urea pump is freezed by secondary, if not secondary freeze, urea pump can be
It is directly initiated when receiving enabling signal, freezes in case of secondary, then can forbid urea pump startup, to protect to urea pump
Shield, avoids frozen urea pump from directly initiating and damage, preferably ensure that the normal work of urea pump, improve SCR system
The working performance of system.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the flow chart of the control method of SCR system provided in an embodiment of the present invention.
Specific embodiment
The present invention provides a kind of control method of SCR system, the urea pump after the completion of thawing can be avoided because again
It is damaged when freezing and starting, preferably ensure that the normal work of urea pump.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the control method relates generally to the embodiment of the invention provides a kind of control method of SCR system
The content that starting how is coped with after urea pump is frozen, mainly comprises the steps that
11) after at low ambient temperatures, T15 is powered on, the ECU of engine judges the urine of SCR system under the cooperation of sensor
Whether element pump needs to thaw, if so, heating to urea pump, so that urea pump enters heating thawed state, until urea
Pump, which thaws, to be completed；If it is not, then can directly carry out subsequent operation, such as starting urea pump；
12) while detecting that urea pump defrosting is completed, ECU is enabled to start timing；
13) after engine start, enabling signal is issued to SCR system, timing stops when urea pump receives enabling signal
Only, and ECU judges timing duration whether to be equal to or more than the preset duration being set in advance in ECU that (preset duration is urea
Pump is frozen required most to be grown in short-term), if so, forbid urea pump startup, i.e., when starting after the completion of urea pump defrosting to it,
The duration being spaced between this has been enough to enable urea pump generation is secondary to freeze, if frozen urea pump foundation opens again
Dynamic signal is started, then is likely to cause the damage of urea pump, so ECU is in this case in order to protect urea pump
Forbid urea pump startup.
Further, in order to realize that the normal work of SCR system, above-mentioned control method are further comprising the steps of:
14) it repeats step 11) and step 12) reaffirms whether urea pump needs that is, after urea pump is prohibited starting
It thaws, if necessary to thaw, then urea pump is heated again, and start again at timing after the completion of defrosting；
15) urea pump is started again, i.e., urea pump stops timing after receiving enabling signal again, and judgement is again
Whether the duration of timing is less than preset duration, if so, starting urea pump, the i.e. duration of this minor tick can not make urea pump by the
Freeze three times, meet the starting requirement of urea pump, so ECU allows urea pump startup.
In the control method of above-mentioned SCR system, the specific operation process of step 11) are as follows:
111) temperature sensor carries out temperature measurement to urea pump, and judges whether the temperature measured is lower than thaw point
(it is frozen to be then considered as urea pump lower than thaw point), if so, heating to urea pump, this heating process can pass through electricity
The work of heater is realized；
112) temperature measurement persistently is carried out to the urea pump being heated, i.e., during urea pump is heated, always to urine
Element pump carries out temperature measurement, and whether the temperature of the temperature value real-time judge urea pump obtained according to measurement is equal to or higher than solution
Freeze temperature, if so, stopping heating, urea pump, which thaws, to be completed.
In the control method of above-mentioned SCR system, the specific operation process of step 12) are as follows:
Whether stop heating by sensor real-time detection urea pump, i.e. whether detection electric heater stops working, or
The real time temperature (can then stop heating when the temperature of urea pump reaches thaw point) for detecting urea pump, if so, starting to count
Measure duration of urea pump after the completion of defrosting.
In the control method of above-mentioned SCR system, the specific operation process of step 13) are as follows:
131) whether ECU real-time judge urea pump has received enabling signal, if so, when stopping timing and carrying out timing
Long judgement will be compared with duration preset in ECU after the completion of defrosting to receiving the interval duration before enabling signal；
132) when timing duration is equal to or more than preset duration, i.e., when theoretically urea pump is possible to freeze again, it is
Precise results are obtained, double measurement are carried out to the temperature of urea pump, and judge whether the temperature measured is lower than defrosting temperature again
Degree, if so, represent urea pump has occurred secondary freeze really, it is therefore desirable to forbid urea pump startup；If detection urine again
When the temperature of element pump is higher than thaw point, then no longer forbid urea pump startup, urea pump can then start according to enabling signal, or
Person can also enable urea pump directly initiate when timing duration is less than preset duration.
Each part is described in a progressive manner in this specification, what the main operation point of each part illustrated is
With the difference of existing operation, the entirety and part process of the control method of SCR system can be by combining above-mentioned multiple portions
Operation and obtain.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (5)
1. a kind of control method of SCR system, which comprises the following steps:
11) judge whether the urea pump of SCR system needs to thaw, if so, heating to the urea pump, until the urine
Element pump, which thaws, to be completed；
12) start timing while the urea pump thaws and completes；
13) urea pump stops timing after receiving enabling signal, judges whether timing duration is equal to or more than preset duration,
If so, forbidding the urea pump startup.
2. the control method of SCR system according to claim 1, which is characterized in that further comprising the steps of:
14) step 11) and step 12) are repeated；
15) urea pump stops timing after receiving enabling signal again, and judges whether the duration of timing again is less than institute
Preset duration is stated, if so, starting the urea pump.
3. the control method of SCR system according to claim 1, which is characterized in that step 11) includes:
111) temperature measurement is carried out to the urea pump, and judges whether the temperature measured is lower than thaw point, if so, to institute
Urea pump is stated to be heated；
112) temperature measurement persistently carried out to the urea pump that is heated, and whether the temperature that measures of real-time judge is equal to or high
In the thaw point, if so, stopping heating, the urea pump, which thaws, to be completed.
4. the control method of SCR system according to claim 3, which is characterized in that step 12) specifically:
Whether urea pump described in real-time detection, which stops, being heated, if so, starting timing.
5. the control method of SCR system according to claim 4, which is characterized in that step 13) includes:
131) judge whether the urea pump receives the enabling signal, if so, when stopping timing and carrying out the timing
Long judgement；
132) when the timing duration is equal to or more than the preset duration, the temperature of the urea pump is detected again, and again
It is secondary to judge whether the temperature measured is lower than the thaw point, if so, forbidding the urea pump startup.
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| CN201910581113.8A CN110284948B (en) | 2019-06-29 | 2019-06-29 | Control method of SCR system |
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|---|---|---|---|
| CN201910581113.8A CN110284948B (en) | 2019-06-29 | 2019-06-29 | Control method of SCR system |
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| CN110284948A true CN110284948A (en) | 2019-09-27 |
| CN110284948B CN110284948B (en) | 2020-11-20 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111102048A (en) * | 2019-12-17 | 2020-05-05 | 凯龙高科技股份有限公司 | Heating and unfreezing control system and method for urea pump of SCR system |
| CN111140318A (en) * | 2019-12-30 | 2020-05-12 | 潍柴动力股份有限公司 | Method, device and equipment for diagnosing urea thawing capacity and storage medium |
| CN111485979A (en) * | 2020-04-13 | 2020-08-04 | 凯龙高科技股份有限公司 | Heating control method of liquid supply pump |
| CN113202606A (en) * | 2021-05-08 | 2021-08-03 | 潍柴动力股份有限公司 | Control method and control system for unfreezing urea pump |
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| CN111485979B (en) * | 2020-04-13 | 2022-05-27 | 凯龙高科技股份有限公司 | Heating control method of liquid supply pump |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110284948B (en) | 2020-11-20 |
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