CN106593596B - SCR system closed-loop control calculation method - Google Patents
SCR system closed-loop control calculation method Download PDFInfo
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- CN106593596B CN106593596B CN201611246409.7A CN201611246409A CN106593596B CN 106593596 B CN106593596 B CN 106593596B CN 201611246409 A CN201611246409 A CN 201611246409A CN 106593596 B CN106593596 B CN 106593596B
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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
-
- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- 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
- Y02T10/12—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
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- Chemical & Material Sciences (AREA)
- 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)
- Feedback Control In General (AREA)
Abstract
The present invention relates to a kind of calculation method, especially a kind of SCR system closed-loop control calculation method belongs to the technical field of diesel engine post-processing system.NOx conversion efficiency measured value is calculated by NOx conversion efficiency computing module in the present invention, and the NOx conversion efficiency measured value is compared with NOx conversion efficiency target value, and carry out feedback modifiers, to obtain feedback control coefficient, feedback regulation is carried out to feedforward urea injecting quantity by feedback control coefficient, the calculating time and feedback regulation time of feedback control are considered in feedback regulation simultaneously, adjusting has been made in time to being precisely controlled for system, avoid the delay of spraying system, ensure the accuracy of closed-loop control and the maximum efficiency of system, securely and reliably.
Description
Technical field
The present invention relates to a kind of calculation method, especially a kind of SCR system closed-loop control calculation method, after belonging to diesel engine
The technical field of processing system.
Background technique
Nitrogen oxides (NOx) is the major pollutants of diesel emission, and SCR post-processing technology is state four, state five and state
The technical way of NOx in six Reduction for Diesel Engines low exhaust gas, the basic principle is that being atomized the ammonia to be formed by spraying hydrolysis of urea
With the NOx in exhaust redox reaction occurs for gas in catalyst converter, generates harmless nitrogen.With emission of diesel engine regulation
Gradually plus sternly, NOx emission limit value is lower and lower.To state five, six stage of state, it is desirable that SCR post-processing control system has more precisely
Control ability.
Currently, SCR system urea injection control mode has opened loop control and two kinds of closed-loop control, many units, which have been carried out, is ground
Study carefully work and establishes corresponding urea injection control model.The principle of opened loop control is: utilizing the original machine NOx emission meter estimated
Calculate the urea injecting quantity needed；Closed-loop control calculates the urea injecting quantity needed first with original machine NOx emission, then utilizes
The NOx sensor concentration signal in the downstream SCR carries out PID closed-loop control.
Analyze above-mentioned traditional urea injection control mode, it is understood that there may be following problems: start used in opened loop control
Machine original machine NOx emission value, concentration of aqueous solution of urea value, exhaust flow rate value, urea injection rate and NH3Storing magnitude all can be because of
The variation of use environment (such as: performance, temperature of catalyst etc.) and generate difference, so that measured deviation can not be compensated (i.e. not
The variation of urea injecting quantity caused by above-mentioned difference can be timely feedbacked to control system), eventually lead to actual NOx conversion effect
Rate differs larger with the target value of setting, and is easy to produce higher NH3Leakage, is unable to satisfy increasingly harsh state five, state six
Emission regulation demands；And in view of the calculating of feedback control and the time may not be controlled to adjust in closed-loop control, so as to cause spray
The delay for penetrating system influences the urea injection control precision of system.
Summary of the invention
The purpose of the present invention is overcoming the deficiencies in the prior art, a kind of SCR system closed-loop control calculating side is provided
Method considers that feedback control calculates the influence of time and regulating time, it is ensured that the accuracy of closed-loop control avoids spraying simultaneously
The delay for penetrating system improves the effective utilization of SCR system.
According to technical solution provided by the invention, the SCR system closed loop control method, according to feedforward urea injecting quantity,
SCR upstream temperature sensor signal, original machine NOx concentration, downstream NOx sensor signal, exhaust flow rate signal, NOx conversion efficiency
Target value and the long NOx efficiency difference of previous step calculate quantity of state determination and obtain feedback control enabled state amount；
NOx conversion efficiency measured value is obtained according to original machine NOx concentration, downstream NOx concentration and extraction flow, and according to
NOx conversion efficiency measured value, NOx conversion efficiency target value and the determination of feedback control enabled state amount obtain NOx efficiency difference
And NOx efficiency difference calculates quantity of state, calculates quantity of state according to NOx efficiency difference and NOx efficiency difference obtains feedback control
Coefficient processed, the feedback control coefficient are multiplied with feedforward urea injecting quantity, obtain feedback control urea injecting quantity.
Judgment module is enabled to feedforward urea injecting quantity, SCR upstream temperature sensor signal, original machine by feedback control
NOx concentration, downstream NOx sensor signal, exhaust flow rate signal, NOx conversion efficiency target value and the long NOx efficiency of previous step are poor
Value obtains feedback control enabled state figure after calculating quantity of state operation；
It includes that signal validity and limit value judgment module, feedback margin module, feedback are set that feedback control, which enables judgment module,
Cover half block and the first mixing judgment module；
Signal validity and limit value judgment module receive SCR upstream temperature sensor signal, downstream NOx sensor letter simultaneously
Number, the input of original machine NOx concentration, extraction flow and NOx conversion efficiency target value, and to the first mixing judgment module output letter
Number validity and limit value judge state value；
Feedback margin module obtains feedback control surplus according to feedforward urea injecting quantity and judges state value, feeds back setting module
Quantity of state, which is calculated, according to the long NOx efficiency difference of previous step obtains feedback setting state value；
First mixing judgment module judges that state value, feedback control surplus judge state value according to signal validity and limit value
And feedback setting state value judges to obtain feedback control enabled state amount.
The signal validity and limit value judgment module include that signal effective character state value module and limit value judge state
It is worth module；
The signal effective character state value module include first judgment module, the second judgment module, third judgment module with
And second mixing judgment module；
First judgment module receives SCR upstream temperature sensor state value and the judgement of SCR upstream temperature sensor state
Calibration value, when SCR upstream temperature sensor state value judges calibration value not less than SCR upstream temperature sensor state, first
Judgment module output-scr upstream temperature sensor judgment value；
Second judgment module receives downstream NOx sensor state value and downstream NOx sensor state judges calibration value, when
When downstream NOx sensor state value judges calibration value not less than downstream NOx sensor state, the second judgment module exports downstream
NOx sensor judgment value；
Third judgment module receives extraction flow data mode value and extraction flow data mode judges calibration value, works as row
When throughput data mode value judges calibration value not less than extraction flow data mode, third judgment module output extraction flow is sentenced
Disconnected value；
Second mixing judgment module simultaneously receive SCR upstream temperature sensor judgment value, downstream NOx sensor judgment value with
And extraction flow judgment value, and can output signal effective character state value.
The limit value judges that state value module includes the first limit value comparison module, the second limit value comparison module, third limit value
Comparison module, the 4th limit value comparison module and third mix judgment module；
First limit value comparison module receives SCR upstream temperature and SCR upstream temperature demarcates limit value, when SCR upstream temperature
When demarcating limit value no more than SCR upstream temperature, the first limit value comparison module output-scr upstream temperature multilevel iudge value；
Second limit value comparison module receives original machine NOx concentration and original machine NOx concentration demarcates limit value, when original machine NOx concentration
When demarcating limit value no more than original machine NOx concentration, the second limit value comparison module exports original machine NOx concentration multilevel iudge value；
Third limit value comparison module receives extraction flow and extraction flow demarcates limit value, when extraction flow is no more than exhaust
When flow calibration limit value, third limit value comparison module exports extraction flow multilevel iudge value；
4th limit value comparison module receives NOx conversion efficiency target value and NOx conversion efficiency demarcates limit value, when NOx turns
When changing efficiency goal value no more than NOx conversion efficiency calibration limit value, the 4th limit value comparison module exports NOx conversion efficiency target ratio
Compared with judgment value；
Third mixes judgment module according to SCR upstream temperature multilevel iudge value, original machine NOx concentration multilevel iudge value, exhaust
Flow, which compares judgment value and NOx conversion efficiency target multilevel iudge value, can export limit value and judge state value.
The feedback margin module includes numerical value contrast module, filter module and feedback margin judgment module；
Numerical value contrast module obtains the amount of injection ratio according to feedforward urea injecting quantity and maximum urea injecting quantity, filters mould
Block feeds back the amount of injection than obtaining the amount of injection filter value, feedback margin judgment module after value filtering according to the amount of injection filter value
Control surplus state.
The feedback setting module includes cumulative integration module, and the cumulative integration module is poor to the long NOx efficiency of previous step
Value calculates quantity of state and integrates within the feedback control time, to obtain feedback setting quantity of state.
NOx is obtained to original machine NOx concentration, downstream NOx concentration and extraction flow by NOx conversion efficiency computing module to turn
Change efficiency measured value, the NOx conversion efficiency computing module includes downstream NOx flow rate calculation module and NOx conversion efficiency meter
Calculate module；
Downstream NOx flow rate calculation module obtains downstream NOx quality stream according to downstream NOx concentration and exhaust flow rate signal
Amount, NOx conversion efficiency computing module obtain NOx conversion efficiency reality according to downstream NOx mass flow and original machine NOx mass flow
Measured value；
Wherein, downstream NOx flow rate calculation module obtains downstream NOx mass according to downstream sensor concentration and extraction flow
The relationship of flow are as follows:
NOx conversion efficiency computing module obtains NOx conversion according to downstream NOx mass flow and original machine NOx mass flow
The relationship of efficiency measured value are as follows:
Advantages of the present invention: being calculated NOx conversion efficiency measured value by NOx conversion efficiency computing module, and by institute
NOx conversion efficiency measured value is stated compared with NOx conversion efficiency target value, and carries out feedback modifiers, to obtain feedback control system
Number carries out feedback regulation to feedforward urea injecting quantity by feedback control coefficient, considers feedback control simultaneously in feedback regulation
Calculating time and feedback regulation time, adjusting has been made in time to being precisely controlled for system, has avoided the delay of spraying system, really
The accuracy of closed-loop control and the maximum efficiency of system are protected, securely and reliably.
Detailed description of the invention
Fig. 1 is logic diagram of the invention.
Fig. 2 is the logic diagram that feedback control of the present invention enables judgment module.
Fig. 3 is the logic diagram of signal validity apparatus module of the present invention.
Fig. 4 is the logic diagram that limit value of the present invention judges state value module.
Fig. 5 is the logic diagram of feedback margin module of the present invention.
Fig. 6 is the logic chart of feedback margin judgment module of the present invention.
Fig. 7 is the logic diagram of present invention feedback setting module.
Fig. 8 is the logic diagram of the cumulative integration module of the present invention.
Fig. 9 is the logic diagram of NOx conversion efficiency computing module of the present invention.
Figure 10 is the logic diagram of NOx efficiency difference operation module of the present invention.
Figure 11 is the logic diagram of feedback control coefficient computing module of the present invention.
Description of symbols: 1- feedback control enables judgment module, 2-NOx transformation efficiency computing module, 3-NOx inefficient
Value computing module, 4- feedback control coefficient computing module, 5- multiplier, 6- signal validity and limit value judge that state value, 7- are anti-
Present surplus module, 8- feedback setting module, 9- first mix judgment module, 10- first judgment module, the second judgment module of 11-,
12- third judgment module, 13- second mix judgment module, the first limit value of 14- comparison module, the second limit value of 15- comparison module,
16- third limit value comparison module, the 4th limit value comparison module of 17-, 18- third mixing judgment module, 19- numerical value comparison module,
The cumulative integration module of 20- filter module, 21- feedback margin judgment module, the 4th judgment module of 22-, 23-, 24- step-length judge mould
Block, the first not circuit of 25-, the second not circuit of 26-, 27- first judge accumulator, the 5th judgment module of 28-, 29- the 4th
Mix judgment module, the downstream 30- NOx flow rate calculation module, 31-NOx transformation efficiency computing module, 32- third not circuit,
The 4th not circuit of 33-, 34- second judge that accumulator, the 6th judgment module of 35-, 36- the 5th mix judgment module, 37- third
Judge that accumulator, 38- the 4th judge accumulator, the first mean value calculation of 39- module, the second mean value calculation of 40- module, 41-
Difference calculating module, 42- feedback modifiers table, 43- first adder, 44- first compare selector, 45- second compare selector,
46- Coefficient selector, 47- third compare the 7th judgment module of selector, 48- second adder and 49-.
Specific embodiment
Below with reference to specific drawings and examples, the invention will be further described.
At the same time when the influence of consideration feedback control calculating time and regulating time, in order to ensure the essence of closed-loop control
True property, avoids the delay of spraying system, improves the effective utilization of SCR system, the present invention is according to feedforward urea injecting quantity, SCR
Upstream temperature sensor signal, original machine NOx concentration, downstream NOx sensor signal, exhaust flow rate signal, NOx conversion efficiency target
Value and the long NOx efficiency difference of previous step calculate quantity of state determination and obtain feedback control enabled state amount；
NOx conversion efficiency measured value is obtained according to original machine NOx concentration, downstream NOx concentration and extraction flow, and according to
NOx conversion efficiency measured value, NOx conversion efficiency target value and the determination of feedback control enabled state amount obtain NOx efficiency difference
And NOx efficiency difference calculates quantity of state, calculates quantity of state according to NOx efficiency difference and NOx efficiency difference obtains feedback control
Coefficient processed, the feedback control coefficient are multiplied with feedforward urea injecting quantity, obtain feedback control urea injecting quantity.
As shown in Figure 1, enabling judgment module 1 pair of feedforward urea injecting quantity, SCR upstream temperature sensor by feedback control
Signal, original machine NOx concentration, downstream NOx sensor signal, exhaust flow rate signal, NOx conversion efficiency target value and previous step are long
NOx efficiency difference obtains feedback control enabled state figure after calculating quantity of state operation；By NOx conversion efficiency computing module to original
Machine NOx concentration, downstream NOx concentration and extraction flow calculate to obtain NOx conversion efficiency measured value, are transported by NOx efficiency difference
It calculates module 3 and enables judgment module 1 to NOX conversion efficiency measured value and NOx conversion efficiency target value operation, and in feedback control
NOx efficiency difference is exported under the control of the feedback control enabled state amount of output and NOx efficiency difference calculates quantity of state, is passed through
Feedback control coefficient computing module 4 obtains feedback control after calculating quantity of state operation to NOx efficiency difference and NOx efficiency difference
Coefficient, the feedback control coefficient obtain feedback control urea injecting quantity after being multiplied by multiplier 5 with feedforward urea injecting quantity.
When it is implemented, the NOx efficiency difference of NOx efficiency difference operation module output calculates, quantity of state input value feedback control is enabled to be sentenced
In disconnected module 1, i.e., the long NOx efficiency difference of previous step for enabling judgment module 1 as feedback control calculates quantity of state.
In the embodiment of the present invention, SCR upstream temperature sensor signal includes that SCR upstream temperature sensor state value is (described
SCR upstream temperature sensor state value is 0 and 1 two kind of situation, respectively SCR upstream temperature sensor Signal Fail and normal
Two states, main function are to judge whether SCR upstream temperature sensor numerical value is effective and available) and SCR upstream temperature value,
Downstream NOx sensor signal includes that (downstream NOx sensor state value and SCR upstream temperature sense downstream NOx sensor state value
The value of device state value is identical, and main function is to judge whether downstream NOx sensor numerical value is effective and available) and downstream NOx
Concentration, exhaust flow rate signal include extraction flow data mode value (the value state and the upstream SCR temperature of extraction flow data mode
It is identical to spend sensor status values, main function is to judge whether extraction flow numerical value is effective and available) and exhaust flow rate value.
As shown in Fig. 2, enabling judgment module 1 pair of feedforward urea injecting quantity, SCR upstream temperature sensor by feedback control
Signal, original machine NOx concentration, downstream NOx sensor signal, exhaust flow rate signal, NOx conversion efficiency target value and previous step are long
NOx efficiency difference obtains feedback control enabled state figure after calculating quantity of state operation；
It includes signal validity and limit value judgment module 6, feedback margin module 7, feedback that feedback control, which enables judgment module 1,
Setting module 8 and the first mixing judgment module 9；
Signal validity and limit value judgment module 6 receive SCR upstream temperature sensor signal, downstream NOx sensor simultaneously
The input of signal, original machine NOx concentration, extraction flow and NOx conversion efficiency target value, and it is defeated to the first mixing judgment module 9
Signal validity and limit value judge state value out；
Feedback margin module 7 obtains feedback control surplus according to feedforward urea injecting quantity and judges state value, feedback setting mould
Block 8 calculates quantity of state according to the long NOx efficiency difference of previous step and obtains feedback setting state value；
First mixing judgment module 9 judges that state value, feedback control surplus judge state according to signal validity and limit value
Value and feedback setting state value judge to obtain feedback control enabled state amount.
In the embodiment of the present invention, the first mixing judgment module 9 also receives feedback control manual switch signal, is controlled by feedback
Manual switch signal processed determines that feedback control enables whether judgment module 1 needs operation and output feedback ontrol enabled state amount.
Feedback control manual switch is scalar quantity, and it acts as determine whether control system needs using feedback control tune according to calibration value
Section.Feedback control enabled state amount includes to believe SCR upstream temperature sensor signal, original machine NOx concentration, downstream NOx sensor
Number, exhaust flow rate signal, NOx efficiency target value, feedforward urea injecting quantity, NOx efficiency difference calculate quantity of state etc. and make operation
And judgement, determine the validity of each state value and numerical value.
Signal validity and limit value judge that state value acts on are as follows: judge SCR upstream temperature signal, downstream Nox sensor letter
Number, original machine NOx concentration, exhaust flow rate signal, NOx conversion efficiency target value whether effectively and its whether in limits, from
And determine that the numerical value for participating in calculating is true and reliable.Feedback control surplus judges that state value acts on are as follows: judges whether control system has
The overdose space for thering is feedback control to adjust.Feedback setting state value effect are as follows: state is calculated by the long NOx efficiency difference of previous step
It measures and determines the feedback control time, the feedback control time is the action time of last feedback regulation, and the feedback control time is straight
Connecing influences the accuracy that feedback control is adjusted.Logical AND order is executed in first mixing judgment module 9, refers to that each state value is effective
When ability output feedback ontrol enabled state amount.The feedback control enabled state amount is the basis that feedback control is adjusted, and is only protected
It demonstrate,proves the feedback control enabled state amount normally to export, just can guarantee the normal regulating function of closed-loop control, it otherwise can not be effective
Carry out feedback control adjusting, while the feedback control enabled state amount be NOx efficiency difference operation module 3 run judgement according to
According to.
The signal validity and limit value judgment module 6 include that signal effective character state value module and limit value judge state
It is worth module；
The signal effective character state value module includes that first judgment module 10, the second judgment module 11, third judge mould
Block 12 and the second mixing judgment module 13；
First judgment module 10 receives SCR upstream temperature sensor state value and SCR upstream temperature sensor state is sentenced
Disconnected calibration value, when SCR upstream temperature sensor state value judges calibration value not less than SCR upstream temperature sensor state, the
One judgment module, 10 output-scr upstream temperature sensor judgment value；
Second judgment module 11 receives downstream NOx sensor state value and downstream NOx sensor state judges calibration value,
When downstream NOx sensor state value judges calibration value not less than downstream NOx sensor state, under the output of the second judgment module 11
Swim NOx sensor judgment value；
Third judgment module 12 receives extraction flow data mode value and extraction flow data mode judges calibration value, when
When extraction flow data mode value judges calibration value not less than extraction flow data mode, third judgment module 12 exports exhaust stream
Measure judgment value；
Second mixing judgment module 13 receives SCR upstream temperature sensor judgment value, downstream NOx sensor judgment value simultaneously
And extraction flow judgment value, and can output signal effective character state value.
As shown in figure 3, SCR upstream temperature sensor judgment value, downstream NOx sensor judgment value, extraction flow data are sentenced
Disconnected value is compared judgement, SCR upstream temperature sensor shape with corresponding calibration value by corresponding sensor status values
State value judges calibration value not less than SCR upstream temperature sensor state, and the SCR upstream temperature sensor judgment value of output is 1, no
Then, the SCR upstream temperature sensor judgment value of output is 0.Downstream NOx sensor judgment value, extraction flow judgment value it is specific
Value with SCR upstream temperature sensor judgment value, no longer illustrates one by one herein.Signal effective character state value is to the upstream SCR
The judgement of temperature sensor, downstream NOx sensor and extraction flow sensor states confirms the validity of its data, prevents
Respective sensor is in failure state, and signal validity and limit value judgment module 6 are the basis that feedback control enables judgment module 1
Module.
As shown in figure 4, the limit value judges that state value module compares mould including the first limit value comparison module 14, the second limit value
Block 15, third limit value comparison module 16, the 4th limit value comparison module 17 and third mix judgment module 18；
First limit value comparison module 14 receives SCR upstream temperature and SCR upstream temperature demarcates limit value, when the upstream SCR temperature
When degree is no more than SCR upstream temperature calibration limit value, 14 output-scr upstream temperature multilevel iudge value of the first limit value comparison module；
Second limit value comparison module 15 receives original machine NOx concentration and original machine NOx concentration demarcates limit value, when original machine NOx is dense
When degree is no more than original machine NOx concentration calibration limit value, the second limit value comparison module 15 exports original machine NOx concentration multilevel iudge value；
Third limit value comparison module 16 receives extraction flow and extraction flow demarcates limit value, when extraction flow is no more than row
When throughput demarcates limit value, third limit value comparison module 16 exports extraction flow multilevel iudge value；
4th limit value comparison module 17 receives NOx conversion efficiency target value and NOx conversion efficiency demarcates limit value, works as NOx
When transfer efficiency target value is no more than NOx conversion efficiency calibration limit value, the 4th limit value comparison module 17 exports NOx conversion efficiency mesh
Mark multilevel iudge value；
Third mixes judgment module 18 according to SCR upstream temperature multilevel iudge value, original machine NOx concentration multilevel iudge value, row
Throughput multilevel iudge value and NOx conversion efficiency target multilevel iudge value can export limit value and judge state value.
In the embodiment of the present invention, when SCR upstream temperature is no more than SCR upstream temperature calibration limit value, the first limit value compares
14 output numerical value of module " 1 ", the second limit value comparison module 15, third limit value comparison module 16 and third limit value comparison module 17
Output it is similar with the first limit value comparison module 14, specifically no longer repeat one by one.Limit value judges that state value is to the upstream SCR temperature
Degree, original machine NOx concentration, extraction flow, NOx conversion efficiency target value are compared judgement, prevent data spilling etc. beyond correspondence
The case where demarcating limit value prevents data participation operation of transfiniting, to prevent the inaccuracy of feedback regulation.Specifically, only
One limit value comparison module 14, the second limit value comparison module 15, third limit value comparison module 16 and the 4th limit value comparison module 17
When equal output numerical value " 1 ", the limit value that third mixing judgment module 18 exports judges that state value is just " 1 ", and expression does not have data super
Out the case where limit value, otherwise, surface has data beyond limit value.
As shown in figure 5, the feedback margin module 7 includes numerical value contrast module 19, filter module 20 and feedback margin
Judgment module 21；
Numerical value contrast module 19 obtains the amount of injection ratio according to feedforward urea injecting quantity and maximum urea injecting quantity, filters
Module 20 obtains the amount of injection than obtaining the amount of injection filter value, feedback margin judgment module 21 after value filtering according to the amount of injection filter value
To feedback control surplus state.
In the embodiment of the present invention, numerical value comparison module 19 is that the urea injecting quantity that will feedover is made with maximum urea injecting quantity
Quotient, to obtain the amount of injection ratio；Filter module 20 generally uses low-pass first order filter, and feedover urea injecting quantity and maximum urine
The specific determination process of plain the amount of injection is known to those skilled in the art, and details are not described herein again.According to feedback control surplus shape
State can judge the overdose space of feedback regulation necessity and feedback control.
When it is implemented, numerical value " 1 " and the difference and feedback margin lower limit calibration value of the amount of injection filter value are input to
In 4th judgment module 22 of feedback margin judgment module 21, as shown in fig. 6, when the numerical value " 1 " and the amount of injection filter value
When difference is not less than feedback margin lower limit calibration value, 21 output feedback ontrol surplus of feedback margin judgment module judges state value.
Feedback margin lower limit calibration value can be obtained according to Experimental Calibration, specific calibration process be those skilled in the art known to, this
Place repeats no more.Feedback control surplus judges state value by comparing feedforward urea injecting quantity and maximum urea injecting quantity
Compared with feedback control surplus judges that state value is the overdose space for judging feedback regulation, so that it is determined that the necessity of feedback regulation.
As shown in fig. 7, the feedback setting module 8 includes cumulative integration module 22, the cumulative integration module 22 is to upper
One step-length NOx efficiency difference calculates quantity of state and integrates within the feedback control time, to obtain feedback setting quantity of state.
In the embodiment of the present invention, the feedback control time can obtain according to Experimental Calibration, and specific calibration process is this technology
Known to the personnel of field, details are not described herein again.Due to when carrying out feedback setting, it is contemplated that the long NOx efficiency difference meter of previous step
Quantity of state is calculated, to can guarantee that feedback control effect reaches optimum state.
As shown in figure 8, the long NOx efficiency difference of previous step calculates shape for the specific works logic chart of cumulative integration module 23
State amount inputs step-length judgment module 24, and the long NOx efficiency difference calculating quantity of state of input previous step, will as current step value
The NOx efficiency difference that step-length judgment module 24 stores calculates quantity of state as previous step long value；If current step value is greater than upper one
When step value, 24 output numerical value of step-length judgment module " 1 ", otherwise, otherwise 24 output numerical value of step-length judgment module " 0 ".Step-length is sentenced
The numerical value that disconnected module 24 exports, which is exported after the first not circuit 25 to the second not circuit 26 and the 4th mixing, judges mould
Block 29, the output end of the second not circuit 26 judge that accumulator 27 is connect with first, and first judges another input of accumulator 27
End input numerical value " 1 ".When the logical value of the second not circuit 26 output is " 0 ", first judges that accumulator 27 tires out since 1
Add, when the logical value of the second not circuit 26 output is " 1 ", first judge after accumulator 27 exports accumulated result and general
Accumulation result is reset.First judges that accumulated result output valve is passed through the 5th judgment module 28, and the 5th judgement by accumulator 27
Another input terminal feedback control time of module 28 judges accumulation result that accumulator 27 exports not less than feedback control when first
When the time, the 5th judgment module 28 exports judgment value to the 4th mixing judgment module 29, and the 4th mixing judgment module 29 is according to the
The judgment value of five judgment modules 28 output and the numerical value of the first not circuit 25 output, obtain feedback setting state after judgement
Amount.
In the embodiment of the present invention, it is logical operation quantity of state that the long NOx efficiency difference of previous step, which calculates quantity of state,.By current
The NOx efficiency difference of step-length calculates quantity of state and the NOx efficiency difference quantity of state of previous step length participates in operation, can judge indirectly anti-
Present the cumulative integral condition in setting module 8；Moreover, it is judged that the NOx conversion efficiency target in NOx efficiency difference operation module 3
The cumulative integral condition of value and NOx conversion efficiency measured value.
As shown in figure 9, by NOx conversion efficiency computing module 2 to original machine NOx concentration, downstream NOx concentration and exhaust stream
Measure NOx conversion efficiency measured value, the NOx conversion efficiency computing module 2 include downstream NOx flow rate calculation module 30 and
NOx conversion efficiency computing module 31；
Downstream NOx flow rate calculation module 30 obtains downstream NOx quality stream according to downstream NOx concentration and exhaust flow rate signal
Amount, NOx conversion efficiency computing module 31 obtain NOx conversion efficiency according to downstream NOx mass flow and original machine NOx mass flow
Measured value；
Wherein, downstream NOx flow rate calculation module 30 obtains downstream NOx matter according to downstream sensor concentration and extraction flow
Measure the relationship of flow are as follows:
NOx conversion efficiency computing module (31) obtains NOx according to downstream NOx mass flow and original machine NOx mass flow
The relationship of transformation efficiency measured value are as follows:
In the embodiment of the present invention, the specific acquisition modes of original machine NOx mass flow are row known to those skilled in the art
The specific value of throughput can detect to obtain, specially those skilled in the art institute by corresponding extraction flow sensor
Numerical value, details are not described herein again.
As shown in Figure 10, NOx efficiency difference operation module 3 include third not circuit 32, third not circuit 32 it is defeated
Outlet is connect with the input terminal of the input terminal of the 4th not circuit 33 and the 5th mixing judgment module 36, the 4th not circuit 33
Output end judge that an input terminal of accumulator 34 is connect with second, second judge accumulator 34 another input terminal input numerical value
" 1 ", second judges that the output end of accumulator 34 is connect with the input terminal of the 6th judgment module 35, the 6th judgment module 35 it is another
Input terminal receives feedback control and calculates the time, and the 5th mixing judgment module 36 exports NOx efficiency difference and calculates quantity of state.
It further include that third judges accumulator 37 and the 4th judges accumulator 38, third judges an input terminal of accumulator 37
NOx conversion efficiency target value is received, third judges that another input terminal of accumulator 37 receives the logical value of the long calculated value of previous step；
4th judge accumulator 38 with input terminal receive NOx conversion efficiency measured value, the 4th judge accumulator 38 the other end reception
The long calculated value of previous step.Third judges that the output end of accumulator 37 is connect with an input terminal of the first mean value calculation module 39,
4th judges that the output end of accumulator 38 is connect with an input terminal of the second mean value calculation module 40, the first mean value calculation mould
Block 39, the second mean value calculation module 40 another input terminal receive feedback control calculate the time, the first mean value calculation mould
Block 39 exports NOx conversion efficiency target value mean value, and the second mean value calculation module 40 exports NOx conversion efficiency measured value mean value,
First mean value calculation module 39, the second mean value calculation module 40 output end connect with difference calculating module 41, difference
Computing module 41 also receives the long calculated value of previous step, exports NOx conversion efficiency difference.
In the embodiment of the present invention, the long calculated value of previous step is that the long NOx efficiency difference of previous step calculates quantity of state, NOx effect
The input quantity of rate difference operation module 3 is that NOx efficiency difference calculates quantity of state, NOx conversion efficiency target value and NOx conversion efficiency
Measured value under original state, can calculate quantity of state to NOx efficiency difference and be assigned a value of 0, then start to be calculated, be next time
It can read the NOx efficiency difference stored when last system cut-off is closed when system starting operation and calculate quantity of state.Feedback control makes
Energy quantity of state is the decision content of NOx efficiency difference operation module 3, and only when feedback control enabled state amount is 1, NOx efficiency is poor
It is worth module 3 and carries out operation.First mean value calculation module 39, the second mean value calculation module 40 are that feedback control calculated in the time
Cumulative NOx conversion efficiency target value, NOx conversion efficiency measured value carry out mean value calculation, specifically, will calculate in the time and tire out
The numerical value added is divided by accumulative frequency up to corresponding average value.
As shown in figure 11, feedback control coefficient computing module 4 includes feedback modifiers table 42, and feedback modifiers table 42 is according to NOx
Transformation efficiency difference can search to obtain feedback control correction amount, and by feedback control correction amount input value first adder 43,
First adder 43 also receives the long feedback control coefficient operation values of previous step, and the output end of first adder 43 selects compared with first
Select device 44 an input terminal connection, first compare selector 44 another input terminal receive feedback control coefficient minimum value, first
Compare the input terminal connection of output end selector 45 compared with second of selector 44, second compares the another defeated of selector 45
Enter end and receive feedback control coefficient maximum value, second compares 45 output feedback ontrol coefficient operation values of selector, and will be described anti-
Feedback control coefrficient operation values are exported to Coefficient selector 46.
Feedback control coefficient maximum value also inputs third and compares in selector 47, and third compares the input terminal of selector 47
Numerical value " 1 " and numerical value " -1 " are also inputted, when feedback control coefficient maximum value is greater than 0, third compares selector 47 and exports number
It is worth " 1 ", otherwise, third compares 47 output numerical value " -1 " of selector.The output end and second adder of third selection comparator 47
48 input terminal connection, another input terminal of second adder 48 are connect with the output end of second adder 48, the second addition
The output end of device 48 is connect with an input terminal of the 7th judgment module 49, and another input terminal of the 7th judgment module 49 receives feedback
Control coefrficient transfinites number, the output end of the 7th judgment module 49 to 46 output feedback ontrol reset state of Coefficient selector, and
The input terminal of Coefficient selector 46 also inputs numerical value " 1 ".When feedback control reset state is " 1 ", Coefficient selector 46 is exported
Feedback control coefficient be numerical value " 1 ", feedback control reset state be " 0 " when, Coefficient selector 46 export feedback control system
The feedback control coefficient operation values that number compares the output of selector 45 for second.
In the embodiment of the present invention, NOx conversion efficiency difference is only used in feedback control coefficient computing module 4, and NOx efficiency
It is defeated that difference calculates the next step Long operation that quantity of state enables judgment module 1 and NOx efficiency difference operation module 3 as feedback control
Enter amount.Feedback control coefficient minimum value and feedback control coefficient maximum value are the lower limit value of feedback control coefficient, upper limit value, numerical value
It is determined by rating test.Feedback control coefficient transfinite number be closed-loop control in feedback control coefficient be more than its maximum value
Number, carry out being confirmed whether to need to carry out resetting meter to feedback control coefficient by comparing the feedback control coefficient number that transfinites
It calculates, the feedback control coefficient number that transfinites is determined by rating test.First calculating process for comparing selector 44 is first
The operation values that adder 43 exports are compared with feedback control coefficient minimum value, and biggish numerical value is taken after the two.Second
The explanation for selecting the value condition of comparator 45 that can compare selector 44 with reference to first, details are not described herein again.
NOx conversion efficiency measured value is calculated by NOx conversion efficiency computing module 2 in the present invention, and the NOx is turned
Change efficiency measured value compared with NOx conversion efficiency target value, and carry out feedback modifiers, to obtain feedback control coefficient, passes through
Feedback control coefficient carries out feedback regulation to feedforward urea injecting quantity, when considering the calculating of feedback control simultaneously in feedback regulation
Between and the feedback regulation time, adjusting has been made in time to being precisely controlled for system, has avoided the delay of spraying system, it is ensured that closed loop
The accuracy of control and the maximum efficiency of system, securely and reliably.
Claims (7)
1. a kind of SCR system closed loop control method, it is characterized in that: being believed according to feedforward urea injecting quantity, SCR upstream temperature sensor
Number, original machine NOx concentration, downstream NOx sensor signal, exhaust flow rate signal, NOx conversion efficiency target value and previous step it is long
NOx efficiency difference calculates quantity of state and obtains feedback control enabled state amount；
NOx conversion efficiency measured value is obtained according to original machine NOx concentration, downstream NOx concentration and extraction flow, and is turned according to NOx
Change efficiency measured value, NOx conversion efficiency target value and feedback control enabled state amount determine obtain NOx efficiency difference and
NOx efficiency difference calculates quantity of state, calculates quantity of state according to NOx efficiency difference and NOx efficiency difference obtains feedback control system
Number, the feedback control coefficient are multiplied with feedforward urea injecting quantity, obtain feedback control urea injecting quantity；
Wherein, feedback control enabled state amount includes passing to SCR upstream temperature sensor signal, original machine NOx concentration, downstream NOx
Sensor signal, exhaust flow rate signal, NOx efficiency target value, feedforward urea injecting quantity, NOx efficiency difference calculate quantity of state and make
Operation and judgement determine the validity of each state value and numerical value.
2. SCR system closed loop control method according to claim 1, it is characterized in that: judging mould by the way that feedback control is enabled
Block (1) is to feedforward urea injecting quantity, SCR upstream temperature sensor signal, original machine NOx concentration, downstream NOx sensor signal, row
Throughput signal, NOx conversion efficiency target value and the long NOx efficiency difference of previous step obtain feedback control after calculating quantity of state operation
Enabled state figure processed；
Feedback control enable judgment module (1) include signal validity and limit value judgment module (6), it is feedback margin module (7), anti-
Present setting module (8) and the first mixing judgment module (9)；
Signal validity and limit value judgment module (6) receive SCR upstream temperature sensor signal, downstream NOx sensor letter simultaneously
Number, original machine NOx concentration, extraction flow and NOx conversion efficiency target value, and to first mixing judgment module (9) output signal
Validity and limit value judge state value；
Feedback margin module (7) obtains feedback control surplus according to feedforward urea injecting quantity and judges state value, feeds back setting module
(8) quantity of state is calculated according to the long NOx efficiency difference of previous step and obtains feedback setting state value；
First mixing judgment module (9) judges that state value, feedback control surplus judge state value according to signal validity and limit value
And feedback setting state value judges to obtain feedback control enabled state amount.
3. SCR system closed loop control method according to claim 2, it is characterized in that: the signal validity and limit value are sentenced
Disconnected module (6) include that signal effective character state value module and limit value judge state value module；
The signal effective character state value module includes that first judgment module (10), the second judgment module (11), third judge mould
Block (12) and the second mixing judgment module (13)；
First judgment module (10) receives SCR upstream temperature sensor state value and the judgement of SCR upstream temperature sensor state
Calibration value, when SCR upstream temperature sensor judges calibration value not less than SCR upstream temperature sensor state, first judges mould
Block (10) output-scr upstream temperature sensor judgment value；
Second judgment module (11) receives downstream NOx sensor state value and downstream NOx sensor state judges calibration value, when
When downstream NOx sensor state value judges calibration value not less than downstream NOx sensor state, under the second judgment module (11) output
Swim NOx sensor judgment value；
Third judgment module (12) receives extraction flow data mode value and extraction flow data mode judges calibration value, works as row
When throughput data mode value judges calibration value not less than extraction flow data mode, third judgment module (12) exports exhaust stream
Measure judgment value；
Second mixing judgment module (13) simultaneously receive SCR upstream temperature sensor judgment value, downstream NOx sensor judgment value with
And extraction flow judgment value, and can output signal effective character state value.
4. SCR system closed loop control method according to claim 3, it is characterized in that: the limit value judges state value module
Including the first limit value comparison module (14), the second limit value comparison module (15), third limit value comparison module (16), the 4th limit value ratio
Compared with module (17) and third mixing judgment module (18)；
First limit value comparison module (14) receives SCR upstream temperature and SCR upstream temperature demarcates limit value, when SCR upstream temperature
When demarcating limit value no more than SCR upstream temperature, first limit value comparison module (14) output-scr upstream temperature multilevel iudge value；
Second limit value comparison module (15) receives original machine NOx concentration and original machine NOx concentration demarcates limit value, when original machine NOx concentration
When demarcating limit value no more than original machine NOx concentration, the second limit value comparison module (15) exports original machine NOx concentration multilevel iudge value；
Third limit value comparison module (16) receives extraction flow and extraction flow demarcates limit value, when extraction flow is no more than exhaust
When flow calibration limit value, third limit value comparison module (16) exports extraction flow multilevel iudge value；
4th limit value comparison module (17) receives NOx conversion efficiency target value and NOx conversion efficiency demarcates limit value, when NOx turns
When changing efficiency goal value no more than NOx conversion efficiency calibration limit value, the 4th limit value comparison module (17) exports NOx conversion efficiency mesh
Mark multilevel iudge value；
Third mixes judgment module (18) according to SCR upstream temperature multilevel iudge value, original machine NOx concentration multilevel iudge value, exhaust
Flow, which compares judgment value and NOx conversion efficiency target multilevel iudge value, can export limit value and judge state value.
5. SCR system closed loop control method according to claim 2, it is characterized in that: the feedback margin module (7) includes
Numerical value contrast module (19), filter module (20) and feedback margin judgment module (21)；
Numerical value contrast module (19) obtains the amount of injection ratio according to feedforward urea injecting quantity and maximum urea injecting quantity, filters mould
Block (20) is to the amount of injection than obtaining the amount of injection filter value after value filtering, feedback margin judgment module (21) is according to the amount of injection filter value
Obtain feedback control surplus state.
6. SCR system closed loop control method according to claim 2, it is characterized in that: the feedback setting module (8) includes
Cumulative integration module (23), the cumulative integration module (23) calculate quantity of state to the long NOx efficiency difference of previous step and control in feedback
Integral in time processed, to obtain feedback setting quantity of state.
7. SCR system closed loop control method according to claim 1, it is characterized in that: passing through NOx conversion efficiency computing module
(2) NOx conversion efficiency measured value, the NOx conversion efficiency are obtained to original machine NOx concentration, downstream NOx concentration and extraction flow
Computing module (2) includes downstream NOx flow rate calculation module (30) and NOx conversion efficiency computing module (31)；
Downstream NOx flow rate calculation module (30) obtains downstream NOx quality stream according to downstream NOx concentration and exhaust flow rate signal
Amount, NOx conversion efficiency computing module (31) obtain NOx conversion according to downstream NOx mass flow and original machine NOx mass flow and imitate
Rate measured value；
Wherein, downstream NOx flow rate calculation module (30) obtains downstream NOx mass according to downstream sensor concentration and extraction flow
The relationship of flow are as follows:
NOx conversion efficiency computing module (31) obtains NOx conversion according to downstream NOx mass flow and original machine NOx mass flow
The relationship of efficiency measured value are as follows:
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| CN108708797B (en) * | 2018-05-16 | 2021-01-19 | 潍柴动力股份有限公司 | Control method, control device and control system of whole vehicle emission control system |
| CN108915825A (en) * | 2018-06-29 | 2018-11-30 | 郑州精益达环保科技有限公司 | A kind of machinery pump engine SCR control strategy |
| CN108952901B (en) * | 2018-07-04 | 2019-12-27 | 中国汽车技术研究中心有限公司 | SCR catalyst aging correction method based on double NOx sensors |
| CN109339911B (en) * | 2018-09-30 | 2020-09-18 | 广西玉柴机器股份有限公司 | Control method and system for improving SCR urea crystallization or conversion efficiency reduction |
| CN109681298B (en) * | 2018-11-27 | 2020-12-18 | 江苏大学 | Control system for urea injection self-adaptive correction based on NOx sensor |
| CN109653845A (en) * | 2018-12-27 | 2019-04-19 | 凯龙高科技股份有限公司 | A kind of method for urea injection control meeting the control of in-use automotive NOx emission |
| CN109944666B (en) * | 2019-05-09 | 2021-03-12 | 华东交通大学 | Model-based SCR system reducing agent supply amount self-adaptive correction method |
| CN110761881B (en) * | 2019-09-20 | 2021-01-08 | 东风商用车有限公司 | SCR efficiency diagnosis method |
| CN112196641A (en) * | 2020-10-10 | 2021-01-08 | 上海星融汽车科技有限公司 | Prediction prompting method for driving range of vehicle urea solution |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493860A (en) * | 2011-12-08 | 2012-06-13 | 中国人民解放军军事交通学院 | Closed loop control method for SCR (Selective Catalyst Reduction) system of all-working-condition diesel engine |
| CN101981282B (en) * | 2008-01-23 | 2013-03-27 | 康明斯过滤Ip公司 | Feedback control in selective catalytic reduction |
| CN103266941A (en) * | 2013-04-25 | 2013-08-28 | 中国船舶重工集团公司第七一一研究所 | Control method of marine SCR (selective catalytic reduction) system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8875490B2 (en) * | 2011-03-18 | 2014-11-04 | Cummins Inc. | System and method to control selective catalytic reduction systems in feedback |
| US8627651B2 (en) * | 2011-08-05 | 2014-01-14 | Cummins Emission Solutions, Inc. | NH3 emissions management in a NOx reduction system |
-
2016
- 2016-12-29 CN CN201611246409.7A patent/CN106593596B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101981282B (en) * | 2008-01-23 | 2013-03-27 | 康明斯过滤Ip公司 | Feedback control in selective catalytic reduction |
| CN102493860A (en) * | 2011-12-08 | 2012-06-13 | 中国人民解放军军事交通学院 | Closed loop control method for SCR (Selective Catalyst Reduction) system of all-working-condition diesel engine |
| CN103266941A (en) * | 2013-04-25 | 2013-08-28 | 中国船舶重工集团公司第七一一研究所 | Control method of marine SCR (selective catalytic reduction) system |
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