CN112324543A - SCR urea pump pumpback control system and control method thereof - Google Patents
SCR urea pump pumpback control system and control method thereof Download PDFInfo
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- CN112324543A CN112324543A CN202011178553.8A CN202011178553A CN112324543A CN 112324543 A CN112324543 A CN 112324543A CN 202011178553 A CN202011178553 A CN 202011178553A CN 112324543 A CN112324543 A CN 112324543A
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
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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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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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- 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
- F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
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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
- Y02T10/12—Improving ICE efficiencies
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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
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The utility model provides a SCR urea pump pumpback control system, includes urea sprayer, urea pump, urea feed pipe, engine controller, and engine controller includes urea sprayer control module, urea pump control module, and the signal output part of urea pump control module is connected with the signal input part of urea pump, and the signal output part of urea sprayer control module is connected with the signal input part of urea sprayer, and its control method is: the urea injector control module controls the urea injector to be opened firstly, and then the cyclic repeat urea pump control module controls the urea pump to withdraw T firstly1Second later urea pump stop control T2And the second is at least twice, and finally the urea injector control module controls the urea injector to close, and the pumping back is finished. The design reduces the residual amount of the urea solution in the liquid supply system and improves the reliability of the liquid supply system.
Description
Technical Field
The invention belongs to the technical field of engine tail gas aftertreatment, and particularly relates to a SCR urea pump pumpback control system and a control method, which are suitable for reducing the residual quantity of a urea solution so as to improve the reliability of an SCR liquid supply system.
Background
The SCR post-treatment technology is a main technical means for reducing NOx in tail gas of a diesel engine at present, the working principle of the SCR post-treatment technology is that ammonia gas formed by urea injection through hydrolysis and atomization and NOx in an exhaust pipe are subjected to oxidation-reduction reaction in a catalytic converter to generate harmless nitrogen, an SCR urea supply system comprises a urea box and a urea pump integrally installed at the bottom of the urea box, the urea pump is connected with a urea injector installed on a post-treatment device through a urea pipeline, and the urea pump starts to work to supply liquid when urea is required to be injected.
At present, a urea pump pumping strategy is mainly adopted in the market to avoid the residual urea solution in a liquid supply system, namely, a urea pump continuously rotates reversely for 30-60 seconds after a vehicle is shut down and is shut down, and the residual urea solution in a urea pipeline, a urea injector and the urea pump is pumped back into a urea box, on one hand, the urea pipeline cannot be completely pumped back because the pumping back efficiency of the urea pump is only 50-80 percent, on the other hand, the urea solution is rapidly cooled to form negative pressure by high-temperature air in an exhaust pipe after the pumping back of the urea pump is finished, so that the urea solution flows back into the urea pipeline and the urea injector from the side of the urea box, a large amount of urea solution still remains in the liquid supply system, the residual urea solution is crystallized and expanded under the low-temperature condition, and the system parts are easily damaged, although the method of manufacturing the urea pipeline by adopting materials with larger expansion coefficients and embedding a stainless, the risk of preventing the urea residual solution from damaging system parts can be reduced, but the development period is long and the cost is high. Therefore, a urea pump pumpback control system and a control method thereof which can reduce the residual amount of the urea solution and improve the reliability of a liquid supply system are urgently needed.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides an SCR urea pump pumpback control system and a control method which can reduce the residual quantity of a urea solution and improve the reliability of a liquid supply system.
In order to achieve the above purpose, the invention provides the following technical scheme:
an SCR urea pump pumpback control system comprises a urea injector, a urea pump, a urea liquid supply pipe and an engine controller;
the engine controller comprises a urea injector control module and a urea pump control module, wherein a signal output end of the urea pump control module is connected with a signal input end of a urea pump, and a signal output end of the urea injector control module is connected with a signal input end of a urea injector;
the urea injector control module is used for controlling the opening or closing of a urea injector;
the urea pump control module is used for controlling the urea pump to suck back T1Second, control urea pump to stop T2Second, wherein, the T1The T is the time from the start of the pumping back of the urea pump to the time when the pumping back efficiency of the urea pump reaches the target pumping back efficiency2The time from the start of the urea pump shutdown to the time when the pressure value at the liquid outlet of the urea pump reaches the atmospheric pressure value is shown.
The engine controller further comprises a whole vehicle state monitoring module, and the whole vehicle state monitoring module is used for judging whether a whole vehicle engine is in a flameout state or not.
The T is1、T2All are obtained by pre-calibration.
The control system also comprises a urea pump pumpback efficiency monitoring module, a urea pump pressure monitoring module, a urea pump pumpback efficiency detection device and a urea pump pressure sensor, wherein the signal output ends of the urea pump pumpback efficiency detection device and the urea pump pressure sensor are respectively connected with the signal input ends of the urea pump pumpback efficiency monitoring module and the urea pump pressure monitoring module, and the signal output ends of the urea pump pumpback efficiency monitoring module and the urea pump pressure monitoring module are connected with the signal input end of the urea pump control module;
the urea pump pressure sensor is used for detecting a pressure value at a liquid outlet of the urea pump;
the urea pump pumping-back efficiency detection device is used for detecting the pumping-back efficiency of the urea pump;
the urea pump pumpback efficiency monitoring module is used for monitoring whether the pumpback efficiency of the urea pump reaches the target pumpback efficiency in real time, and if so, sending a pumpback stopping signal to the urea pump control module;
the urea pump pressure monitoring module is used for monitoring whether the pressure value at the liquid outlet of the urea pump reaches the atmospheric pressure value or not in real time, and if the pressure value reaches the atmospheric pressure value, sending a stop ending signal to the urea pump control module.
A control method of an SCR urea pump pumpback control system comprises the following steps in sequence:
the method comprises the following steps that firstly, a urea injector control module controls a urea injector to be opened;
step two, the urea pump control module firstly controls the urea pump to suck back T1Second, then the urea pump is controlled to stop T2Second;
and step three, after the step two N times of cyclic repetition, the urea injector control module controls the urea injector to close, and the pumping-back is completed, wherein N is more than or equal to 1 and is a positive integer.
The engine controller also comprises a whole vehicle state monitoring module;
the control method further comprises the following steps:
the method comprises the following steps that when the vehicle engine is monitored to be in a flameout state, the whole vehicle state monitoring module enters a first step, wherein the flameout state of the vehicle engine is specifically that the rotating speed of the engine is zero.
The control system also comprises a urea pump pumpback efficiency monitoring module, a urea pump pressure monitoring module, a urea pump pumpback efficiency detection device and a urea pump pressure sensor, wherein the signal output ends of the urea pump pumpback efficiency detection device and the urea pump pressure sensor are respectively connected with the signal input ends of the urea pump pumpback efficiency monitoring module and the urea pump pressure monitoring module, and the signal output ends of the urea pump pumpback efficiency monitoring module and the urea pump pressure monitoring module are connected with the signal input end of the urea pump control module;
the second step is specifically as follows: firstly, the urea pump control module controls the urea pump to start pumping back, in the pumping back process, the urea pump pumping back efficiency monitoring module monitors whether the pumping back efficiency of the urea pump reaches the target pumping back efficiency in real time, when the target pumping back efficiency is reached, a pumping back stopping signal is sent to the urea pump control module, then the urea pump control module controls the urea pump to start stopping according to the received pumping back stopping signal, in the stopping process, the urea pump pressure monitoring module monitors whether the pressure value at the liquid outlet of the urea pump reaches the atmospheric pressure value in real time, when the atmospheric pressure value is reached, a stopping signal is sent to the urea pump control module, and finally the urea pump control module controls the urea pump to stop stopping according to the received stopping signal.
The target pumpback efficiency is at least 90%.
Compared with the prior art, the invention has the beneficial effects that:
the engine controller in the SCR urea pump pumpback control system comprises a urea injector control module and a urea pump control module, wherein the signal output end of the urea pump control module is connected with the signal input end of a urea pump, the signal output end of the urea injector control module is connected with the signal input end of a urea injector, when the control system operates, the urea injector control module controls the urea injector to be opened firstly, and then the urea pump control module is cyclically repeated to control the urea pump pumpback T firstly1Second-control urea pump stop T2At least two times per second, and finally controlling the urea injector to close by the urea injector control module, wherein T is1For the time from the start of the withdrawal of the urea pump to the time at which the withdrawal efficiency of the urea pump reaches the target withdrawal efficiency, T2In order to start the shutdown of the urea pump until the pressure value at the liquid outlet of the urea pump reaches the atmospheric pressure value, on one hand, the design ensures that the residual amount of urea is within a target residual range by enabling the pumping efficiency of each time of pumping to reach the target pumping efficiency, and on the other hand, the design reduces the negative pressure formed after cooling the high-temperature gas in the exhaust pipe by enabling the pressure value at the liquid outlet of the urea pump to be equal to the atmospheric pressure value when the shutdown is finished, thereby reducing the volume of the urea solution flowing back to the urea pipeline due to the negative pressure, reducing the residual amount of the urea solution in the liquid supply system, and improving the reliability of the liquid supply system. Therefore, the invention reduces the residual quantity of the urea solution and improves the reliability of the liquid supply system.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a control logic diagram of embodiment 1.
In the figure, a urea injector 1, a urea pump 2, an engine controller 3, a urea injector control module 31, a urea pump control module 32, a urea pump withdrawal efficiency monitoring module 33, a urea pump pressure monitoring module 34, a vehicle state monitoring module 35, a urea pump withdrawal efficiency detection device 4, and a urea pump pressure sensor 5 are shown.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Referring to fig. 1, an SCR urea pump pumpback control system includes a urea injector 1, a urea pump 2, a urea supply pipe, and an engine controller 3;
the engine controller 3 comprises a urea injector control module 31 and a urea pump control module 32, wherein a signal output end of the urea pump control module 32 is connected with a signal input end of the urea pump 2, and a signal output end of the urea injector control module 31 is connected with a signal input end of the urea injector 1;
the urea injector control module 31 is used for controlling the opening or closing of the urea injector 1;
the urea pump control module 32 is used for controlling the urea pump 2 to suck back T1Second, control the urea pump 2 to stop T2Second, wherein, the T1The T is the time from the start of the suck-back of the urea pump 2 to the time when the suck-back efficiency of the urea pump 2 reaches the target suck-back efficiency2Is the time from the beginning of the shutdown of the urea pump 2 to the time when the pressure value at the liquid outlet of the urea pump 2 reaches the atmospheric pressure value.
The engine controller 3 further comprises a whole vehicle state monitoring module 35, and the whole vehicle state monitoring module 35 is used for judging whether a whole vehicle engine is in a flameout state or not.
The T is1、T2Obtained by pre-calibration.
The control system further comprises a urea pump withdrawal efficiency monitoring module 33, a urea pump pressure monitoring module 34, a urea pump withdrawal efficiency detection device 4 and a urea pump pressure sensor 5, wherein the signal output ends of the urea pump withdrawal efficiency detection device 4 and the urea pump pressure sensor 5 are respectively connected with the signal input ends of the urea pump withdrawal efficiency monitoring module 33 and the urea pump pressure monitoring module 34, and the signal output ends of the urea pump withdrawal efficiency monitoring module 33 and the urea pump pressure monitoring module 34 are respectively connected with the signal input end of the urea pump control module 32;
the urea pump pressure sensor 5 is used for detecting the pressure value at the liquid outlet of the urea pump 2;
the urea pump pumping-back efficiency detection device 4 is used for detecting the pumping-back efficiency of the urea pump 2;
the urea pump withdrawal efficiency monitoring module 33 is configured to monitor whether the withdrawal efficiency of the urea pump 2 reaches a target withdrawal efficiency in real time, and if so, send a withdrawal stopping signal to the urea pump control module 32;
the urea pump pressure monitoring module 34 is configured to monitor whether a pressure value at the liquid outlet of the urea pump 2 reaches an atmospheric pressure value in real time, and send a stop signal to the urea pump control module 32 if the pressure value reaches the atmospheric pressure value.
A control method of an SCR urea pump pumpback control system comprises the following steps in sequence:
step one, the urea injector control module 31 controls the urea injector 1 to be opened;
step two, the urea pump control module 32 firstly controls the urea pump 2 to suck back T1Second, then the urea pump 2 is controlled to stop T2Second;
and step three, after the step two N times of cyclic repetition, the urea injector control module 31 controls the urea injector 1 to close, and the pumping-back is completed, wherein N is more than or equal to 1 and is a positive integer.
The engine controller 3 further comprises a whole vehicle state monitoring module 35;
the control method further comprises the following steps:
the whole vehicle state monitoring module 35 monitors that the vehicle engine is in a flameout state, and then the step one is performed, wherein the flameout state of the vehicle engine is specifically that the rotating speed of the engine is zero.
The control system further comprises a urea pump withdrawal efficiency monitoring module 33, a urea pump pressure monitoring module 34, a urea pump withdrawal efficiency detection device 4 and a urea pump pressure sensor 5, wherein the signal output ends of the urea pump withdrawal efficiency detection device 4 and the urea pump pressure sensor 5 are respectively connected with the signal input ends of the urea pump withdrawal efficiency monitoring module 33 and the urea pump pressure monitoring module 34, and the signal output ends of the urea pump withdrawal efficiency monitoring module 33 and the urea pump pressure monitoring module 34 are respectively connected with the signal input end of the urea pump control module 32;
the second step is specifically as follows: firstly, the urea pump control module 32 controls the urea pump 2 to start the pumping back, in the pumping back process, the urea pump pumping back efficiency monitoring module 33 monitors whether the pumping back efficiency of the urea pump 2 reaches the target pumping back efficiency in real time, when the target pumping back efficiency is reached, a pumping back stopping signal is sent to the urea pump control module 32, then the urea pump control module 32 controls the urea pump 2 to start the shutdown according to the received pumping back stopping signal, in the shutdown process, the urea pump pressure monitoring module 34 monitors whether the pressure value at the liquid outlet of the urea pump 2 reaches the atmospheric pressure value in real time, when the pressure value reaches the atmospheric pressure value, a shutdown ending signal is sent to the urea pump control module 32, and finally the urea pump control module 32 controls the urea pump 2 to stop the shutdown according to the received shutdown ending signal.
The target pumpback efficiency is at least 90%.
The principle of the invention is illustrated as follows:
the SCR urea pump pumpback control system and the control method thereof reduce the residual amount of urea on the premise of ensuring that the material and the structure of the original pipeline are not changed, and can not cause the damage of the pipeline in the urea pump and the inner pipe of the urea liquid supply pipe even if the residual solution of urea freezes and expands in the ultralow temperature environment, thereby improving the reliability of the SCR liquid supply system.
Example 1:
referring to fig. 1, an SCR urea pump pumpback control system includes a urea injector 1, a urea pump 2, a urea liquid supply pipe, and an engine controller 3, where the engine controller 3 includes a urea injector control module 31 and a urea pump control module 32, a signal output end of the urea pump control module 32 is connected to a signal input end of the urea pump 2, and a signal output end of the urea injector control module 31 is connected to a signal input end of the urea injector 1;
referring to fig. 2, the control method of the SCR urea pump pumpback control system is sequentially performed according to the following steps:
step one, the urea injector control module 31 controls the urea injector 1 to be opened;
step two, firstly, the urea pump control module 32 controls the urea pump 2 to suck back T1Second, said T1To begin the pumpback from the urea pump 2 until the pumpback efficiency of the urea pump 2 reaches the target pumpback efficiency, the urea pump control module 32 then controls the urea pump 2 to shut down T2Second, said T2Is the time from the beginning of the shutdown of the urea pump 2 to the pressure value at the liquid outlet of the urea pump 2 reaching the atmospheric pressure value, wherein T is1、T2All the target extraction efficiency is obtained by pre-calibration, and the target extraction efficiency is 90%;
and step three, the step two is repeated for 1 time in a circulating mode, then the urea injector control module 31 controls the urea injector 1 to be closed, and the pumping-back is completed.
Example 2:
referring to fig. 1, an SCR urea pump pumpback control system includes a urea injector 1, a urea pump 2, a urea liquid supply tube, an engine controller 3, a urea pump pumpback efficiency detection device 4, and a urea pump pressure sensor 5, where the engine controller 3 includes a urea injector control module 31, a urea pump control module 32, a urea pump pumpback efficiency monitoring module 33, a urea pump pressure monitoring module 34, and a vehicle state monitoring module 35, signal output ends of the urea pump pumpback efficiency detection device 4 and the urea pump pressure sensor 5 are respectively connected with signal input ends of the urea pump pressure monitoring module 34 and the urea pump pumpback efficiency monitoring module 33, signal output ends of the urea pump pressure monitoring module 34 and the urea pump pumpback efficiency monitoring module 33 are both connected with a signal input end of the urea pump control module 32, a signal output end of the urea pump control module 32 is connected with a signal input end of the urea pump 2, the signal output end of the urea injector control module 31 is connected with the signal input end of the urea injector 1;
the control method of the SCR urea pump pumpback control system is sequentially carried out according to the following steps:
step one, the whole vehicle state monitoring module 35 monitors that the vehicle engine is in a flameout state, and then the step two is performed, wherein the flameout state of the vehicle engine is specifically that the rotating speed of the engine is zero.
Step two, the urea injector control module 31 controls the urea injector 1 to be opened;
step three, firstly, the urea pump control module 32 controls the urea pump 2 to start the pumping back, in the pumping back process, the urea pump pumping back efficiency monitoring module 33 monitors whether the pumping back efficiency of the urea pump 2 reaches the target pumping back efficiency in real time, when the target pumping back efficiency is reached, a pumping back stopping signal is sent to the urea pump control module 32, then the urea pump control module 32 controls the urea pump 2 to start the shutdown according to the received pumping back stopping signal, in the shutdown process, the urea pump pressure monitoring module 34 monitors whether the pressure value at the liquid outlet of the urea pump 2 reaches the atmospheric pressure value in real time, when the pressure value reaches the atmospheric pressure value, a shutdown ending signal is sent to the urea pump control module 32, finally the urea pump control module 32 controls the urea pump 2 to stop the shutdown according to the received shutdown ending signal, wherein the target pumping back efficiency is 90%;
and step four, the step three is circularly repeated for 1 time, then the urea injector control module 31 controls the urea injector 1 to close, and the pumping-back is completed.
Claims (8)
1. The utility model provides a SCR urea pump pumpback control system, includes urea sprayer (1), urea pump (2), urea feed pipe, engine controller (3), its characterized in that:
the engine controller (3) comprises a urea injector control module (31) and a urea pump control module (32), the signal output end of the urea pump control module (32) is connected with the signal input end of the urea pump (2), and the signal output end of the urea injector control module (31) is connected with the signal input end of the urea injector (1);
the urea injector control module (31) is used for controlling the opening or closing of the urea injector (1);
the urea pump control module (32) is used for controlling the urea pump (2) to suck back T1Second, control the urea pump (2) to stop T2Second, wherein, the T1The T is the time from the start of the pumping back of the urea pump (2) to the time when the pumping back efficiency of the urea pump (2) reaches the target pumping back efficiency2Is the time from the start of the shutdown of the urea pump (2) to the time when the pressure value at the liquid outlet of the urea pump (2) reaches the atmospheric pressure value.
2. The SCR urea pump pumpback control system of claim 1, wherein: the engine controller (3) further comprises a whole vehicle state monitoring module (35), and the whole vehicle state monitoring module (35) is used for judging whether a whole vehicle engine is in a flameout state or not.
3. An SCR urea pump pumpback control system as claimed in claim 1 or 2, wherein: the T is1、T2All are obtained by pre-calibration.
4. An SCR urea pump pumpback control system as claimed in claim 1 or 2, wherein:
the control system further comprises a urea pump withdrawal efficiency monitoring module (33), a urea pump pressure monitoring module (34), a urea pump withdrawal efficiency detection device (4) and a urea pump pressure sensor (5), wherein signal output ends of the urea pump withdrawal efficiency detection device (4) and the urea pump pressure sensor (5) are respectively connected with signal input ends of the urea pump withdrawal efficiency monitoring module (33) and the urea pump pressure monitoring module (34), and signal output ends of the urea pump withdrawal efficiency monitoring module (33) and the urea pump pressure monitoring module (34) are respectively connected with a signal input end of the urea pump control module (32);
the urea pump pressure sensor (5) is used for detecting the pressure value at the liquid outlet of the urea pump (2);
the urea pump pumpback efficiency detection device (4) is used for detecting the pumpback efficiency of the urea pump (2);
the urea pump withdrawal efficiency monitoring module (33) is used for monitoring whether the withdrawal efficiency of the urea pump (2) reaches the target withdrawal efficiency in real time, and if the target withdrawal efficiency is reached, sending a withdrawal stopping signal to the urea pump control module (32);
the urea pump pressure monitoring module (34) is used for monitoring whether the pressure value at the liquid outlet of the urea pump (2) reaches the atmospheric pressure value or not in real time, and if the pressure value reaches the atmospheric pressure value, sending a stop ending signal to the urea pump control module (32).
5. The control method of the SCR urea pump pumpback control system as defined in claim 1, wherein:
the control method sequentially comprises the following steps:
step one, the urea injector control module (31) controls the opening of the urea injector (1);
step two, the urea pump control module (32) controls firstlyUrea production pump (2) back pumping T1Second, then the urea pump (2) is controlled to stop T2Second;
and step three, after the step two N times of cyclic repetition, the urea injector control module (31) controls the urea injector (1) to close, and the pumping-back is completed, wherein N is more than or equal to 1 and is a positive integer.
6. The control method of the SCR urea pump pumpback control system as defined in claim 5, wherein:
the engine controller (3) further comprises a whole vehicle state monitoring module (35);
the control method further comprises the following steps:
the vehicle state monitoring module (35) enters a first step when monitoring that the vehicle engine is in a flameout state, wherein the flameout state of the vehicle engine is specifically that the rotating speed of the engine is zero.
7. The control method of the SCR urea pump pumpback control system as defined in claim 5 or 6, wherein:
the control system further comprises a urea pump withdrawal efficiency monitoring module (33), a urea pump pressure monitoring module (34), a urea pump withdrawal efficiency detection device (4) and a urea pump pressure sensor (5), wherein signal output ends of the urea pump withdrawal efficiency detection device (4) and the urea pump pressure sensor (5) are respectively connected with signal input ends of the urea pump withdrawal efficiency monitoring module (33) and the urea pump pressure monitoring module (34), and signal output ends of the urea pump withdrawal efficiency monitoring module (33) and the urea pump pressure monitoring module (34) are respectively connected with a signal input end of the urea pump control module (32);
the second step is specifically as follows: firstly, the urea pump control module (32) controls the urea pump (2) to start pumping back, in the pumping-back process, the urea pump pumping-back efficiency monitoring module (33) monitors whether the pumping-back efficiency of the urea pump (2) reaches the target pumping-back efficiency in real time, sending a stop withdrawal signal to the urea pump control module (32) when the target withdrawal efficiency is reached, and then the urea pump control module (32) controlling the urea pump (2) to start stopping according to the received stop withdrawal signal, in the shutdown process, the urea pump pressure monitoring module (34) monitors whether the pressure value at the liquid outlet of the urea pump (2) reaches the atmospheric pressure value in real time, and when the atmospheric pressure value is reached, sending a stop ending signal to the urea pump control module (32), and finally controlling the urea pump (2) to stop according to the received stop ending signal by the urea pump control module (32).
8. The control method of the SCR urea pump pumpback control system as defined in claim 5 or 6, wherein: the target pumpback efficiency is at least 90%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112943419A (en) * | 2021-03-09 | 2021-06-11 | 广西卡迪亚科技有限公司 | Anti-crystallization control method for diesel engine SCR tail gas after-treatment system |
| CN114109566A (en) * | 2021-09-28 | 2022-03-01 | 山东康钧环保科技有限公司 | Generating set SCR system control strategy and purifier |
| CN114215629A (en) * | 2021-12-02 | 2022-03-22 | 江铃汽车股份有限公司 | Emptying method of electronic control type urea injection system |
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