CN115788639A - SCR conversion efficiency monitoring strategy, device and system and judgment method - Google Patents
SCR conversion efficiency monitoring strategy, device and system and judgment method Download PDFInfo
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- CN115788639A CN115788639A CN202211488761.7A CN202211488761A CN115788639A CN 115788639 A CN115788639 A CN 115788639A CN 202211488761 A CN202211488761 A CN 202211488761A CN 115788639 A CN115788639 A CN 115788639A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 82
- 238000012544 monitoring process Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims description 13
- 230000010354 integration Effects 0.000 claims abstract description 61
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 29
- 238000012806 monitoring device Methods 0.000 claims description 8
- 230000001133 acceleration Effects 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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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- Combined Controls Of Internal Combustion Engines (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses an SCR conversion efficiency monitoring strategy, which comprises the following steps: s10, acquiring an integral enabling condition parameter; s20, judging whether the integral enabling condition is met: integrating the upstream NOx mass flow and the downstream NOx mass flow of the SCR when an integration enabling condition is met; s30, judging whether the integral values of the upstream NOx mass flow and the downstream NOx mass flow of the SCR in the time period are effective or not according to the duration time of the integral enabling condition; s40, calculating the actual conversion efficiency after the integral values of the upstream NOx mass flow and the downstream NOx mass flow are accumulated to the main integral limit value, comparing the actual conversion efficiency with the calibrated threshold conversion efficiency, and reporting a fault when the actual conversion efficiency is lower than the threshold conversion efficiency. The invention has the advantages of improving the integration effectiveness and effectiveness judgment, preventing false alarm and the like.
Description
Technical Field
The invention relates to the technical field of SCR, in particular to a monitoring strategy, a monitoring device, a monitoring system and a monitoring judgment method for SCR conversion efficiency.
Background
In the application process of putting products on the market, the fault rate of reporting the SCR conversion efficiency is large. Currently, two technical routes of active monitoring and passive monitoring are mainly adopted for monitoring the SCR conversion efficiency, wherein the passive monitoring is a common monitoring mode, and when the enabling condition of integration is met, the integration of upstream NOx mass flow and downstream NOx mass flow is carried out simultaneously; and when the monitored enabling conditions are met, calculating the actual conversion efficiency according to the integral value of the mass flow of the upstream NOx and the downstream NOx, comparing the actual conversion efficiency with the calibrated threshold conversion efficiency, and when the actual conversion efficiency is lower than the threshold conversion efficiency, reporting a fault.
The conversion efficiency of the SCR is closely related to the exhaust temperature, exhaust mass flow, SCR internal ammonia storage, and mass flow of NOx at the SCR inlet. Under the condition that the ammonia storage amount in the SCR is fixed, when the temperature is higher than 180 ℃, the SCR conversion efficiency is increased along with the increase of the temperature, and when the temperature is higher than 450 ℃, the SCR conversion efficiency is reduced along with the increase of the temperature; when the internal temperature of the SCR is stable, the SCR conversion efficiency increases with the increase of ammonia storage; when the internal temperature of the SCR is stable, the SCR conversion efficiency is reduced along with the transient increase of the exhaust mass flow; the SCR conversion efficiency decreases with a transient increase in NOx mass flow at the SCR inlet. The SCR conversion efficiency is monitored taking into account the SCR characteristics described above. The monitoring of the SCR takes into account conditions such as temperature stability, exhaust gas flow stability, and inlet NOx mass flow stability, which are likely to cause erroneous reports if monitored during periods of instability.
At present, when the enabling condition of integration is met, the upstream NOx mass flow and the downstream NOx mass flow are integrated at the same time, when the enabling condition of integration is not met, the main integral value is fixed at a freezing value, when the integrating condition is met again, integration is continued on the basis of the frozen main integral value, and the efficiency is calculated after the main integral limit value is accumulated. The integration enabling conditions at this stage include the temperature state of the SCR, the upstream NOx concentration within a reasonable range, the exhaust mass flow within a reasonable range, the acceleration amplitude of the vehicle speed, etc. The main problem at this stage is that integration is continued when the integration condition is satisfied, which may cause the NOx value during a period when the SCR temperature changes drastically (although the integration condition is satisfied drastically) or the exhaust gas flow rate changes drastically (although the integration condition is satisfied drastically) to be added to the main integration value, or the NOx integration value during a period when the integration condition is satisfied briefly to be added to the main integration value, and the SCR conversion efficiency during the above period may cause the NOx integration value of this portion to be untrustworthy due to instability, and when the calculation enable condition is satisfied, the calculated true conversion efficiency may deviate from the actual conversion efficiency and may be easily mistaken. The phenomenon of error reporting is very common in the monitoring of the urban sanitation vehicle, the working condition of the urban sanitation vehicle often causes the situation that the integral condition is met for a short time and then is not met, and the integral accumulated during the short-time meeting of the integral condition is not credible. In order to solve the problem, a judgment strategy for the integral validity is set, and the validity of an integral value is improved and the monitoring robustness is improved through the validity strategy.
The above background disclosure is only for the purpose of assisting understanding of the concept and technical solution of the present invention and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.
Disclosure of Invention
The invention aims to provide an SCR conversion efficiency monitoring strategy for improving integral effectiveness and effectiveness judgment and preventing false alarm, a device and a system for executing the strategy and a judgment method for the effectiveness of an integral value.
Therefore, the invention provides an SCR conversion efficiency monitoring strategy, device and system and a judgment method.
Preferably, the invention can also have the following technical features:
an SCR conversion efficiency monitoring strategy, comprising the steps of:
s10, acquiring an integral enabling condition parameter;
s20, judging whether the integral enabling condition is met: integrating the upstream NOx mass flow and the downstream NOx mass flow of the SCR when an integration enabling condition is met;
s30, judging whether the integral values of the upstream NOx mass flow and the downstream NOx mass flow of the SCR in the time period are effective or not according to the duration time of the integral enabling condition;
and S40, calculating the actual conversion efficiency after the integral values of the upstream NOx mass flow and the downstream NOx mass flow are accumulated to the main integral limit value, comparing the actual conversion efficiency with the calibrated threshold conversion efficiency, and reporting a fault when the actual conversion efficiency is lower than the threshold conversion efficiency.
Further, in step S10, the integration enabling condition includes a temperature state of the SCR, a concentration of the upstream NOx within a reasonable range, an exhaust mass flow rate within a reasonable range, and an acceleration width of the vehicle speed.
Further, in step S30, if the integration enable condition is satisfied and the time requirement of the duration is reached, the integrated value in the time period is determined to be valid, and the valid integrated value is added to the main integration;
otherwise, the integral value in the time period is judged to be invalid, the integral value is reset to 0 and is not added to the main integral value, and the step S20 is returned to.
Further, in step S30, a timer is connected to the ECU, and when the integration enable condition is satisfied, the timer starts to count down, and during a period from the start of counting down to the end of counting, if the integration enable condition is satisfied, the integrated values of the upstream NOx mass flow rate and the downstream NOx mass flow rate during this time counting down are determined to be valid; on the contrary, if the integral enabling condition is not satisfied from the time when the timer starts counting down to the time when the counting is finished, the integral value of the upstream NOx mass flow and the downstream NOx mass flow generated at the time node when the timer starts counting down to the time when the integral enabling condition is not satisfied is judged to be invalid.
Further, the duration of the satisfaction of the integration enabling condition can be set according to requirements, for example, the duration of the satisfaction of the integration enabling condition is counted down in a count-down manner.
Further, the duration for which the integration enable condition is satisfied is 2 to 3min, for example, 2 to 3min in a countdown.
The method for judging the validity of the integral value of the SCR conversion efficiency monitoring strategy comprises the steps of presetting the duration of time for which an integral enabling condition is met, starting countdown by a timer when the integral enabling condition is met, and judging that the integral value in a countdown time period is valid if the integral enabling condition is met all the time from the beginning of timing by the timer to the end of the timer; if the integration enable does not meet before the timer ends, the integral value from the beginning of the timer to the time point when the integration enable condition cannot meet is judged to be invalid.
Further, a timer program is written in the ECU to count down, and the counting down time length is set.
The SCR conversion efficiency monitoring device is used for executing the SCR conversion efficiency monitoring strategy and comprises a data receiving module, an integration module, a monitoring condition judging module, an efficiency calculating module and a fault judging module,
the data receiving module is used for receiving and processing signals sent by an engine ECU and an NOx sensor;
the monitoring condition judging module is used for calculating the received data and judging whether the working condition of the engine can carry out efficiency monitoring or not;
the integration module is used for integrating the NOx mass flow at the upstream of the SCR and the NOx mass flow at the downstream of the SCR;
also comprises an integral effective judging module which is used for judging the effective integral of the whole system,
the integral effective judgment module judges whether the integral value of the integral module in the time period is effective or not according to the duration time of meeting the integral enabling condition;
the efficiency calculation module is used for calculating the actual conversion efficiency after the integrated value is accumulated to the main integral limit value;
and the fault judgment module is used for comparing the actual conversion efficiency with the calibrated threshold conversion efficiency so as to report the fault.
The monitoring system comprises a memory and the monitoring device, wherein the memory stores the SCR conversion efficiency monitoring strategy.
Compared with the prior art, the invention has the advantages that: by setting a time condition which is continuously met, NOx integral values which are not credible and appear due to unstable SCR conversion efficiency are eliminated, the calculated real conversion efficiency is prevented from deviating from the actual conversion efficiency, and further false alarm faults are avoided.
Drawings
Fig. 1 is a diagram of a prior art SCR monitoring logic.
FIG. 2 is a logic diagram of the SCR conversion efficiency monitoring strategy of the present invention.
FIG. 3 is a flow chart of the SCR conversion efficiency monitoring strategy of the present invention.
Fig. 4 is a schematic diagram of an SCR conversion efficiency monitoring device of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein like reference numerals refer to like parts, unless otherwise specified.
An SCR conversion efficiency monitoring strategy as shown in fig. 1 comprises the following steps:
s10, obtaining an integral enabling condition parameter, wherein the integral enabling condition comprises but is not limited to the temperature state of SCR, the concentration of upstream NOx within a reasonable range, the exhaust mass flow rate within a reasonable range and the acceleration amplitude of vehicle speed.
S20, judging whether the integral enabling condition is met: integrating the upstream NOx mass flow and the downstream NOx mass flow of the SCR when an integration enabling condition is met;
s30, judging whether the integral values of the mass flow rate of the upstream NOx and the mass flow rate of the downstream NOx in the SCR in the time period are effective or not according to the duration time of the satisfaction of the integral enabling condition;
if the integration enabling condition is met and the requirement of the duration is met, judging that the integral value in the time period is valid, and adding the valid integral value into the main integral;
otherwise, the integral value in the time period is judged to be invalid, the integral value is reset to 0 and is not added to the main integral value, and the step S20 is returned to.
S40, calculating the actual conversion efficiency after the integral values of the upstream NOx mass flow and the downstream NOx mass flow are accumulated to the main integral limit value, comparing the actual conversion efficiency with the calibrated threshold conversion efficiency, and reporting a fault when the actual conversion efficiency is lower than the threshold conversion efficiency.
In step S30, a timer is connected to the ECU, and when the integration enable condition is satisfied, the timer starts to count down, and during the period from the start of counting down to the end of counting, if the integration enable condition is satisfied all the time, it is determined that the integrated values of the upstream NOx mass flow rate and the downstream NOx mass flow rate during this countdown are valid; on the contrary, if the integral enabling condition is not satisfied from the time when the timer starts counting down to the time when the counting is finished, the integral value of the upstream NOx mass flow and the downstream NOx mass flow generated from the time when the timer starts counting down to the time when the integral enabling condition is not satisfied is judged to be invalid. For example, if a 2min countdown is set, if the integration enabling condition is met, and the integration enabling condition is met within the following 2min, the integration value within the 2min is valid, and the step S20 is executed; on the contrary, if the integration enable condition is satisfied and the integration enable condition is not satisfied within the following 2min, if the integration enable condition is not satisfied after the countdown of 1min, the integration value from the start of the countdown to the time of 1min is invalidated, the part of the integration value is reset to 0 and is not added to the main integration, and the process returns to the step S20. By setting a time condition which is continuously met, NOx integral values which are not credible and appear due to unstable SCR conversion efficiency are eliminated, the calculated real conversion efficiency is prevented from deviating from the actual conversion efficiency, and further false alarm faults are avoided. Optionally, the countdown duration may be set according to a requirement.
Specifically, for the timer, a time timer program is written in the ECU to count down, and the count down period is set, that is, when the integration enable condition is satisfied, the count down is started, and integration of the upstream NOx mass flow rate and the downstream NOx mass flow rate is started at the same time.
A method for judging the validity of an integral value applied to the SCR conversion efficiency monitoring strategy comprises the steps of presetting the duration P min of the duration time that an integral enabling condition is met; when the integral enabling condition is met, the timer starts to count down, and when the integral enabling condition is met all the time from the time when the timer starts to count the time to the time when the timer ends (namely, counting the time P min), the integral value in the time period of counting down P min is judged to be effective; if the integration enable does not meet before the timer ends, the integral value from the beginning of the timer to the time point when the integration enable condition cannot meet is judged to be invalid. Preferably, a timer program is written in the ECU to count down, and a count-down period is set.
The SCR conversion efficiency monitoring device comprises a data receiving module, an integration module, a monitoring condition judging module, an efficiency calculating module and a fault judging module, wherein the data receiving module is used for receiving and processing signals sent by an engine ECU and a NOx sensor; the monitoring condition judging module is used for calculating the received data and judging whether the working condition of the engine can be monitored in efficiency or not; the integration module is used for integrating the NOx mass flow at the upstream part of the SCR and the NOx mass flow at the downstream part of the SCR; the system also comprises an integral effective judgment module, wherein the integral effective judgment module judges whether the integral value of the integral module is effective in the time period according to the duration time of the integral enabling condition; the efficiency calculation module is used for calculating the actual conversion efficiency after the integrated value is accumulated to the main integral limit value; and the fault judgment module is used for comparing the actual conversion efficiency with the calibrated threshold conversion efficiency so as to report a fault.
The monitoring system for the SCR conversion efficiency comprises a storage and the monitoring device, wherein the storage stores the SCR conversion efficiency monitoring strategy.
Those skilled in the art will recognize that numerous variations are possible in light of the above description, and therefore the examples and drawings are merely intended to describe one or more specific embodiments.
While there has been described and illustrated what are considered to be example embodiments of the present invention, it will be understood by those skilled in the art that various changes and substitutions can be made therein without departing from the spirit of the invention. In addition, many modifications may be made to adapt a particular situation to the teachings of the present invention without departing from the central concept described herein. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments and equivalents falling within the scope of the invention.
Claims (10)
1. An SCR conversion efficiency monitoring strategy, characterized by: the method comprises the following steps:
s10, acquiring an integral enabling condition parameter;
s20, judging whether the integral enabling condition is met: integrating the upstream NOx mass flow and the downstream NOx mass flow of the SCR when an integration enabling condition is met;
s30, judging whether the integral values of the upstream NOx mass flow and the downstream NOx mass flow of the SCR in the time period are effective or not according to the duration time of the integral enabling condition;
s40, calculating the actual conversion efficiency after the integral values of the upstream NOx mass flow and the downstream NOx mass flow are accumulated to the main integral limit value, comparing the actual conversion efficiency with the calibrated threshold conversion efficiency, and reporting a fault when the actual conversion efficiency is lower than the threshold conversion efficiency.
2. The SCR conversion efficiency monitoring strategy of claim 1, wherein: in step S10, the integration enabling conditions include a temperature state of the SCR, a concentration of upstream NOx within a reasonable range, an exhaust mass flow rate within a reasonable range, and an acceleration width of a vehicle speed.
3. The SCR conversion efficiency monitoring strategy of claim 1, wherein: in step S30, if the integration enable condition is satisfied and the requirement of the duration is met, the integral value in the time period is determined to be valid, and the valid integral value is added to the main integral;
otherwise, the integral value in the time period is judged to be invalid, the integral value is reset to 0 and is not added to the main integral value, and the step S20 is returned to.
4. An SCR conversion efficiency monitoring strategy as defined in claim 3, wherein: in step S30, a timer is connected to the ECU, and when the integration enable condition is satisfied, the timer starts to count down, and during a period from the start of counting down to the end of counting, if the integration enable condition is satisfied, the integrated values of the upstream NOx mass flow rate and the downstream NOx mass flow rate during this countdown are determined to be valid; on the contrary, if the integral enabling condition is not satisfied from the time when the timer starts counting down to the time when the counting is finished, the integral value of the upstream NOx mass flow and the downstream NOx mass flow generated at the time node when the timer starts counting down to the time when the integral enabling condition is not satisfied is judged to be invalid.
5. An SCR conversion efficiency monitoring strategy as defined in any one of claims 1 wherein: the duration of time that the integration enable condition is met may be set as desired.
6. An SCR conversion efficiency monitoring strategy as claimed in claim 5, wherein: the duration that the integration enabling condition is met is 2-3 min.
7. A method for determining the validity of an integration value applied to the SCR conversion efficiency monitoring strategy of claim 1, characterized in that: presetting duration of time of duration that an integral enabling condition is met, starting countdown by a timer when the integral enabling condition is met, and judging that an integral value in a countdown time period is valid if the integral enabling condition is met all the time from the beginning of timing by the timer to the end of the timer; if the timer does not satisfy the integration enable before the end of counting, it is determined that the integration value is invalid from the start of counting by the timer to the occurrence of a point in time at which the integration enable condition cannot be satisfied.
8. The integrated value validity judging method according to claim 7, characterized in that: and writing a time timer program in the ECU to count down, and setting the counting down time length.
9. An SCR conversion efficiency monitoring device for executing the SCR conversion efficiency monitoring strategy of any one of claims 1 to 6, comprising a data receiving module, an integrating module, a monitoring condition judging module, an efficiency calculating module, and a fault judging module,
the data receiving module is used for receiving and processing signals sent by an engine ECU and a NOx sensor;
the monitoring condition judging module is used for calculating the received data and judging whether the working condition of the engine can be monitored in efficiency or not;
the integration module is used for integrating the NOx mass flow at the upstream of the SCR and the NOx mass flow at the downstream of the SCR;
the method is characterized in that: also comprises an integral effective judging module which is used for judging the effective integral of the whole system,
the integral effective judging module judges whether the integral value of the integral module in the time period is effective or not through the duration time of the integral enabling condition;
the efficiency calculation module is used for calculating the actual conversion efficiency after the integrated value is accumulated to the main integral limit value;
and the fault judgment module is used for comparing the actual conversion efficiency with the calibrated threshold conversion efficiency so as to report the fault.
10. An SCR conversion efficiency monitoring system is characterized in that: the monitoring system comprises a memory in which the SCR conversion efficiency monitoring strategy according to any one of claims 1-6 is stored, and a monitoring device according to claim 9.
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