CN115263504B - Sensor credibility judging method and device - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 60
- 230000004044 response Effects 0.000 claims abstract description 24
- 230000008859 change Effects 0.000 claims description 65
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 29
- 229910021529 ammonia Inorganic materials 0.000 claims description 13
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000012821 model calculation Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims 2
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 abstract description 16
- 101150105073 SCR1 gene Proteins 0.000 abstract description 16
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 abstract description 16
- 238000012795 verification Methods 0.000 abstract description 5
- 230000009975 flexible effect Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 12
- 101000668165 Homo sapiens RNA-binding motif, single-stranded-interacting protein 1 Proteins 0.000 description 7
- 102100039692 RNA-binding motif, single-stranded-interacting protein 1 Human genes 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The application discloses a sensor credibility judging method and device. When the method is executed, a judging mode is determined according to the obtained first airspeed, the first average temperature, the second average temperature and the first upstream concentration, a first measured value and a first model calculated value of a first sensor are obtained and whether the first sensor is credible or not is judged in response to the judging mode at the first moment being the first judging mode. According to NH 3 Sensor signal to NOx1 signal and SCR1 efficiency relationship, NH 3 Sensor signal to NOx1 signal, NOx2 signal, and SCR efficiency relationship, NH is used 3 Sensor and NOx1 sensor contrast verification, NH 3 Determination of NH by a sensor and a comparison check of NOx1 and NOx2, alone or in combination 3 Reliability of the sensor, and more accurate and flexible judgment of NH 3 The offset of the sensor signal is not trusted.
Description
Technical Field
The application relates to the technical field of ammonia leakage detection, in particular to a method and a device for judging the credibility of a sensor.
Background
SCR in diesel engine aftertreatment (post-selective catalytic reduction in a large background of pollution reduction and ecological environmental protectionConversion device) is responsible for the environmental protection of NOx in the exhaust gases (NO and NO in the automobile exhaust gases) 2 Nitrogen oxide) to N 2 For reducing the emission amount of NOx and seven future emissions, NH 3 The sensor is the preferred solution in meeting emissions compliance.
To meet the efficiency of gas conversion in practical applications, NH in the overall structural system is generally required 3 The credibility of the sensor is judged. Credibility means NH 3 Whether the value measured by the sensor itself is authentic, i.e. NH 3 Whether the sensor is faulty. There is currently no efficient method for determining NH in aftertreatment systems 3 Sensor trustworthiness.
Disclosure of Invention
In view of this, the embodiment of the application provides a method and a device for judging the credibility of a sensor, which aim to judge whether the detection of the sensor is accurate or not.
In a first aspect, a method for determining sensor reliability includes:
acquiring a first airspeed, a first average temperature, a second average temperature and a first upstream concentration, wherein the first average temperature is a weighted average of a first SCR and a first ASC downstream temperature, the second average temperature is a weighted average of the first SCR and the first SCR downstream temperature, and the first upstream concentration is a oxynitride concentration upstream of the first SCR;
determining a judgment mode according to the first airspeed, the first average temperature, the second average temperature and the first upstream concentration, wherein the judgment mode comprises a first judgment mode and a second judgment mode;
responding to a judging mode at a first moment as the first judging mode, and acquiring a first measured value of a first sensor and a first model calculated value, wherein the first sensor is positioned between the first SCR and the second SCR, and the first model calculated value is used for representing the relation between ammonia and oxynitride downstream of the first SCR;
and judging whether the first sensor is credible or not according to the first measured value, the first model calculated value and the second average temperature.
Optionally, the determining a determination mode according to the first airspeed, the first average temperature, the second average temperature, and the first upstream concentration includes:
and determining that the judgment mode at the first moment is a first judgment mode in response to the first airspeed being within an airspeed limit, the change rate of the first airspeed being not greater than an airspeed change limit, the second average temperature being within a second temperature range, the second average temperature change rate being not greater than a second temperature change limit, the first upstream concentration being within a concentration limit and the change rate of the first upstream concentration being not greater than a concentration change limit.
Optionally, the determining a determination mode according to the first airspeed, the first average temperature, the second average temperature, and the first upstream concentration includes:
and determining that the judgment mode at the first moment is a second judgment mode in response to the first airspeed being within an airspeed limit, the change rate of the first airspeed being not greater than an airspeed change limit, the first average temperature being within a first temperature range, the first average temperature change rate being not greater than a first temperature change limit, the first upstream concentration being within a concentration limit, and the change rate of the first upstream concentration being not greater than a concentration change limit.
Optionally, the determining whether the first sensor is trusted according to the first measured value and the first model calculated value includes:
acquiring a first ratio, a third average temperature and a first ratio range determined according to the third average temperature, wherein the first ratio is the ratio of the first model calculated value to the first measured value, the third average temperature is a second average temperature between the first moment and the second moment, and the first moment is earlier than the second moment;
determining that the first sensor is not trusted in response to the first ratio being outside the first ratio range.
Optionally, the determining a judging mode according to the first airspeed, the first average temperature, the second average temperature and the first upstream concentration, where the judging mode includes a first judging mode and a second judging mode, and then further includes:
responding to the judging mode at the first moment as the second judging mode, acquiring a second measured value of the second sensor and a second model calculated value, wherein the second sensor is positioned behind the first ASC, and the second model calculated value is used for representing the amount of oxynitride after the first ASC;
and judging whether the first sensor is credible or not according to the second measured value, the second model calculated value and the first average temperature.
Optionally, the determining whether the first sensor is trusted according to the second measured value, the second model calculated value and the first average temperature includes:
acquiring a second ratio, a fourth average temperature and a second ratio range determined according to the fourth average temperature, wherein the second ratio is a ratio of the second model calculated value to the second measured value, the fourth average temperature is a first average temperature between the first moment and a second moment, and the first moment is earlier than the second moment;
in response to the second ratio being outside the second ratio range, determining that the first sensor is not trusted.
In a second aspect, an embodiment of the present application provides a sensor reliability determining apparatus, including:
the first information acquisition module is used for acquiring a first airspeed, a first average temperature, a second average temperature and a first upstream concentration, wherein the first average temperature is a weighted average value of a first SCR and a first ASC downstream temperature, the second average temperature is a weighted average value of the first SCR and the first SCR downstream temperature, and the first upstream concentration is a NOx concentration upstream of the first SCR;
a judgment mode determination module configured to determine a judgment mode according to the first airspeed, the first average temperature, the second average temperature, and the first upstream concentration, the judgment mode including a first judgment mode and a second judgment mode;
the first numerical calculation module is used for responding to the first judging mode at the first moment to obtain a first measured value of a first sensor and a first model calculated value, wherein the first sensor is positioned between the first SCR and the second SCR, and the first model calculated value is used for representing the relation between ammonia and oxynitride downstream of the first SCR;
and the first credibility judging module is used for judging whether the first sensor is credible or not according to the first measured value, the first model calculated value and the second average temperature.
Optionally, the judging mode determining module includes:
the first judgment mode determining module is used for determining that the judgment mode at the first moment is a first judgment mode in response to the first airspeed being in an airspeed limit range, the change rate of the first airspeed being not greater than an airspeed change limit, the second average temperature being in a second temperature range, the second average temperature change rate being not greater than a second temperature change limit, the first upstream concentration being in a concentration limit range and the change rate of the first upstream concentration being not greater than a concentration change limit.
And a second judgment mode determining module, responsive to the first airspeed being within an airspeed limit, the rate of change of the first airspeed being no greater than an airspeed change limit, the first average temperature being within a first temperature range, the first average temperature rate of change being no greater than a first temperature change limit, the first upstream concentration being within a concentration limit, and the rate of change of the first upstream concentration being no greater than a concentration change limit, for determining that the judgment mode at the first moment is the second judgment mode.
Optionally, the first credibility judgment module includes:
the first judgment processing module is used for obtaining a first ratio, a third average temperature and a first ratio range determined according to the third average temperature, wherein the first ratio is the ratio of the first model calculated value to the first measured value, the third average temperature is a second average temperature between the first moment and the second moment, and the first moment is earlier than the second moment; determining that the first sensor is not trusted in response to the first ratio being outside the first ratio range.
Optionally, the apparatus further includes:
a second value judging module, responsive to a judging mode at a first moment being the second judging mode, for obtaining a second measured value of the second sensor and a second model calculated value, the second sensor being located after the first ASC, the second model calculated value being used to represent an amount of nitrogen oxides after the first ASC;
and the second credibility judging module is used for judging whether the first sensor is credible or not according to the second measured value, the second model calculated value and the first average temperature.
The second judging and processing module is used for acquiring a second ratio, a fourth average temperature and a second ratio range determined according to the fourth average temperature, wherein the second ratio is a ratio of the second model calculated value to the second measured value, the fourth average temperature is a first average temperature between the first moment and the second moment, and the first moment is earlier than the second moment;
in response to the second ratio being outside the second ratio range, determining that the first sensor is not trusted.
Optionally, the second credibility judgment module includes:
acquiring a second ratio, a fourth average temperature and a second ratio range determined according to the fourth average temperature, wherein the second ratio is a ratio of the second model calculated value to the second measured value, the fourth average temperature is a first average temperature between the first moment and a second moment, and the first moment is earlier than the second moment;
in response to the second ratio being outside the second ratio range, determining that the first sensor is not trusted.
The embodiment of the application provides a sensor credibility judging method and device. By obtaining the firstAnd determining a judging mode according to the airspeed, the first average temperature, the second average temperature and the first upstream concentration, and responding to the judging mode at the first moment as the first judging mode to acquire a first measured value and a first model calculated value of the first sensor and judge whether the first sensor is credible or not. Thus, NH can be used by selecting the judgment mode 3 Sensor and NOx1 sensor contrast verification, NH 3 Determination of NH by a sensor and a comparison check of NOx1 and NOx2, alone or in combination 3 The sensor is not trusted, an optimal judgment strategy is selected according to real-time data in the post-processing system, and then whether the sensor is trusted is judged according to the judgment strategy. By comparing NH with the hardware component of the direct detection sensor 3 The relation between the sensor signal and the NOx sensor and the SCR efficiency is compared, so that NH can be judged more accurately 3 The offset of the sensor signal is not trusted.
Drawings
In order to more clearly illustrate this embodiment or the technical solutions of the prior art, the drawings that are required for the description of the embodiment or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for determining the reliability of a sensor according to an embodiment of the present application;
FIG. 2 is a flow chart of a method for determining the reliability of a sensor according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a device for determining the reliability of a sensor according to an embodiment of the present application;
FIG. 4 is a graph showing the spatial position and signal relationship of each sensor according to an embodiment of the present application;
FIG. 5 shows SCR efficiency and NH according to an embodiment of the present application 3 Leakage relation graph.
Detailed Description
In order to make the present application better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As described above, the sensor is generally installed after the SCR of the catalytic converter during the current exhaust gas treatment process, and the reliability of the sensor can be judged only according to one SCR due to the installation of the sensor at the end. However, the inventor finds that the detection method is single, only judges according to the downstream data of the SCR, and when the SCR has internal faults or the detected data has errors, the reliability judgment of the ammonia sensor is affected to a certain extent, so that the accuracy of the judgment mode is low.
In order to solve the problem, the embodiment of the application provides a method and a device for judging the credibility of a sensor. When the method is executed, a judging mode is determined according to the obtained first airspeed, the first average temperature, the second average temperature and the first upstream concentration, a first measured value and a first model calculated value of a first sensor are obtained and whether the first sensor is credible or not is judged in response to the judging mode at the first moment being the first judging mode. Thus, NH can be used by selecting the judgment mode 3 Sensor and NOx1 sensor contrast verification, NH 3 The comparison and verification of the sensor and the NOx1 and the NOx2 are used for judging whether the NH3 sensor is unreliable singly or in combination, an optimal judgment strategy is selected according to real-time data in the aftertreatment system, and then whether the sensor is reliable or not is judged according to the judgment strategy. By comparing NH with the sensor reliability determined by only one SCR 3 The relation between the sensor signal and the NOx sensor and the SCR efficiency is compared, the method has more accurate qualitative and flexible properties, and the existing product has no NH 3 Technical application of the sensor in the position between SCR1 and SCR2, without passing through two conversion devicesThe reliability of the sensor is detected, so that the NH can be judged more accurately 3 The offset of the sensor signal is not trusted.
The method provided by the embodiment of the application is executed by the controller, and the controller can control each component device in the system, such as a temperature sensor, a NOx1 sensor and a spray nozzle DM1, and NH is arranged in front of SCR2 after SCR1 3 A sensor, a NOx2 sensor, a temperature sensor and the like are arranged behind the tail pipe ASC. The controller may obtain detection values of the sensors, where the first sensor is located between the first SCR (SCR 1) and the second SCR (SCR 2), and the second sensor is located behind the tail pipe ASC, and the spatial position and signal relationship diagram of the sensors are shown in fig. 4 of the specification.
The following describes a method for determining the reliability of a sensor according to the present application by using an embodiment. Referring to fig. 1, fig. 1 is a flowchart of a method for determining sensor reliability according to an embodiment of the present application, including:
s101: a first space velocity, a first average temperature, a second average temperature, and a first upstream concentration are obtained.
The first airspeed is the average airspeed of the SCR, the first average temperature is a weighted average of the first SCR and a first ASC downstream temperature, the second average temperature is a weighted average of the first SCR and the first SCR downstream temperature, and the first upstream concentration is the NOx concentration upstream of the first SCR. The above values can be obtained by the controller in the actual application process.
S102: determining a determination mode based on the first airspeed, the first average temperature, the second average temperature, and the first upstream concentration.
The judging modes comprise a first judging mode and a second judging mode. The first judging mode is NH 3 A check contrast mode between the sensor and the NOx1 sensor, wherein the second judging mode is NH 3 The sensor is compared to a check of NOx1 and NOx 2.
In the overall judgment process, the diagnosis release general conditions mainly comprise the following: SCR average airspeed (first airspeed), SCR average temperature (first average temperature), SCR1 average temperature (second average temperature), NOx1 sensor, and the like.
Condition 1: the SCR airspeed (first airspeed) is in an upper limit range and a lower limit range, and the change rate of the airspeed is smaller than or equal to the limit value, and airspeed condition 1 is enabled;
condition 2: the average temperature of SCR (weighted average of the upstream temperature of SCR1 and the downstream temperature of the first ASC) is in an upper limit range and a lower limit range, the change rate of temperature is less than or equal to the limit value, and the temperature condition 2 is enabled; wherein the rate of change of temperature is calculated by calculating the difference between the ending temperature and the starting temperature over a period of time, divided by the time.
Condition 3: the average temperature of the SCR1 (the weighted average value of the upstream temperature of the SCR1 and the downstream temperature calculated by the SCR1 model) is in an upper limit range and a lower limit range, the change rate of the temperature is smaller than or equal to the limit value, and the temperature condition 3 is enabled;
condition 4: the concentration of NOx (first upstream concentration) upstream of the SCR1 is within an upper limit and a lower limit, the change rate of the concentration is smaller than or equal to the limit value, and the concentration condition 4 is enabled;
and executing a first judging mode when the real-time data corresponding to the current moment accords with the conditions 1, 3 and 4.
And executing a second judging mode when the real-time data corresponding to the current moment meets the conditions 1, 2 and 4.
By selecting the above judgment mode, NH can be used 3 Sensor and NOx1 sensor contrast verification, NH 3 The sensor and the comparison check of NOx1 and NOx2 are used for judging NH singly or in combination 3 The sensor is not trusted.
S103: and responding to the judging mode at the first moment as the first judging mode, and acquiring a first measured value and a first model calculated value of the first sensor.
The first time is the current detection time.
When the judgment mode at the current moment is judged to be the first judgment mode, a first measured value of the ammonia sensor and a first model calculated value are obtained, wherein the first measured value is obtained by directly measuring the current sensor, the first model calculated value is obtained by calculating the controller according to the NOx1 sensor and the SCR1 parameter, namely, the calculated first model calculated value is used for representing the relation between ammonia and oxynitride at the downstream of the first SCR through a formula (4) in the following deduction process.
With respect to the formulas required for the calculation of the first model calculation value,
the analysis process of the SCR efficiency and the sensor signal is as follows:
SCR efficiency and NH as shown in figure 5 of the specification 3 Leakage relation diagram, from which a model relation order of SCR system configuration can be derived, for SCR1, an efficiency relation in steady state can be established:
SCR1 downstream NOx concentration relationship:
（1）
SCR1 downstream NH 3 Concentration relation:
（2）
injection amount versus NOx emission:
（3）
where snr represents the signal measured by the sensor. anr is meant to represent ammonia nitrogen ratio, i.e. NH injected 3 To NOx concentration ratio for NOx abatement.Represents the NOx conversion efficiency of SCR1, +.>NOx conversion efficiency, representing SCR2, +.>Representing the NOx conversion efficiency of the ASC.
Obtaining NH downstream of SCR1 by formulas (1), (2) and (3) 3 Relationship with NOx 1:
（4）
the formula is derived according to basic rules, and the existing product is free of NH 3 The sensor is in this position and the trustworthiness of this sensor is not detected. Has creative contribution.
For SCR2, an efficiency relationship in steady state can be established:
SCR2 downstream NOx concentration relationship:
（5）
SCR2 downstream NH 3 Concentration relation:
（6）
by substituting equation (1) into equations (5) (6), the NH downstream of SCR2 is obtained 3 And NOx:
（7）
（8）
as for ASC, since the NOx sensor can make NH 3 Measured as NOx, the value of NOx after ASC therefore contains two parts, NOx amount and NH 3 Leakage amount:
（9）
: efficiency of oxidizing ammonia for ASC
: NH for NOx sensor pair 3 Cross sensitivity of (2)
: indicating post-treatment outlet position
S104: and judging whether the first sensor is credible or not according to the first measured value, the first model calculated value and the second average temperature.
Acquiring a first ratio, a third average temperature and a first ratio range determined according to the third average temperature, wherein the first ratio is the ratio of the first model calculated value to the first measured value, the third average temperature is a second average temperature between the first moment and the second moment, and the first moment is earlier than the second moment; determining that the first sensor is not trusted in response to the first ratio being outside the first ratio range.
In the actual application process, when the current judgment mode is the first judgment mode, calculating a model NH according to the formula (4) 3 Calculating an ammonia sensor cumulative value (first measured value), calculating an SCR1 average temperature (second average temperature) during the enabling period (the period between the first time and the second time), and calculating an ammonia sensor cumulative value and a model calculated NH after the integration time exceeds the limit value 3 Is considered to be NH when the proportionality coefficient is not within the upper and lower limit ranges (first ratio ranges) determined based on the average temperature 3 The sensor is not trusted. Wherein the integration time is determined according to a preset.
In the actual application process, when the current ammonia sensor is not trusted, namely the current sensor has a fault, a controller can send a reminding message or an early warning message to a system display module.
The following describes the sensor credibility judging method provided by the embodiment of the application in detail. Referring to fig. 2, fig. 2 is a schematic flow chart of a method for determining sensor reliability according to an embodiment of the present application. The specific process is as follows:
s201: a first space velocity, a first average temperature, a second average temperature, and a first upstream concentration are obtained.
The controller acquires real-time data of all components at the current moment, and calculates and integrates the real-time data to obtain a first airspeed, a first average temperature, a second average temperature and a first upstream concentration.
S202: determining a determination mode based on the first airspeed, the first average temperature, the second average temperature, and the first upstream concentration.
And determining which judgment mode the current system is suitable for according to the combination condition of the four judgment conditions. The specific determination process is shown in S102, and will not be described herein.
S203: and responding to the judging mode at the first moment as the second judging mode, and acquiring a second measured value and a second model calculated value of the second sensor.
Wherein the second sensor is located after the tailpipe ASC, and the second model calculation value is used to represent the amount of the post-ASC nitroxide compound, and may be obtained by calculation according to formula (9).
S204: and judging whether the first sensor is credible or not according to the second measured value, the second model calculated value and the first average temperature.
Acquiring a second ratio, a fourth average temperature and a second ratio range determined according to the fourth average temperature, wherein the second ratio is a ratio of the second model calculated value to the second measured value, the fourth average temperature is a first average temperature between the first moment and a second moment, and the first moment is earlier than the second moment; in response to the second ratio being outside the second ratio range, determining that the first sensor is not trusted.
In the practical application scenario, the accumulated value of the model NOx after ASC (second model calculated value) is calculated according to the formula (9), the accumulated value of the NOx sensor after ASC (second measured value) is calculated, the SCR average temperature (first average temperature) during the enabling period (time interval from the first time to the second time) is calculated, and after the integration time exceeds the limit value, the accumulated value of the NOx sensor and the model meter are calculatedCalculating the ratio of the accumulated values of NOx (second ratio), when the ratio coefficient is not within the upper and lower limit ranges (second ratio range) determined based on the average temperature, the NH is considered 3 The sensor (first sensor) is not trusted. When the proportionality coefficient is within the second ratio range, the ammonia sensor is considered to be free of faults, and the determined NH 3 The sensor detects that the value is authentic.
The embodiment of the application provides some specific implementation modes of the sensor credibility judging method, and based on the specific implementation modes, the application also provides a corresponding device. The apparatus provided by the embodiment of the present application will be described in terms of functional modularization.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a device for determining reliability of a sensor according to an embodiment of the application.
In this embodiment, the apparatus may include:
a first information obtaining module 300, configured to obtain a first airspeed, a first average temperature, a second average temperature, and a first upstream concentration, where the first average temperature is a weighted average of a first SCR and an ASC downstream temperature, the second average temperature is a weighted average of the first SCR and the first SCR downstream temperature, and the first upstream concentration is a NOx concentration upstream of the first SCR;
a determination mode determining module 301, configured to determine a determination mode according to the first airspeed, the first average temperature, the second average temperature, and the first upstream concentration, where the determination mode includes a first determination mode and a second determination mode;
a first numerical calculation module 302, configured to obtain a first measured value of a first sensor and a first model calculated value in response to a determination mode at a first moment being the first determination mode, where the first sensor is located between the first SCR and the second SCR, and the first model calculated value is used to represent a relationship between ammonia gas and oxynitride downstream of the first SCR;
a first credibility judging module 303, configured to judge whether the first sensor is credible according to the first measured value, the first model calculated value, and the second average temperature.
Optionally, the judging mode determining module includes:
the first judgment mode determining module is used for determining that the judgment mode at the first moment is a first judgment mode in response to the first airspeed being in an airspeed limit range, the change rate of the first airspeed being not greater than an airspeed change limit, the second average temperature being in a second temperature range, the second average temperature change rate being not greater than a second temperature change limit, the first upstream concentration being in a concentration limit range and the change rate of the first upstream concentration being not greater than a concentration change limit.
And a second judgment mode determining module, responsive to the first airspeed being within an airspeed limit, the rate of change of the first airspeed being no greater than an airspeed change limit, the first average temperature being within a first temperature range, the first average temperature rate of change being no greater than a first temperature change limit, the first upstream concentration being within a concentration limit, and the rate of change of the first upstream concentration being no greater than a concentration change limit, for determining that the judgment mode at the first moment is the second judgment mode.
Optionally, the first credibility judgment module includes:
the first judgment processing module is used for obtaining a first ratio, a third average temperature and a first ratio range determined according to the third average temperature, wherein the first ratio is the ratio of the first model calculated value to the first measured value, the third average temperature is a second average temperature between the first moment and the second moment, and the first moment is earlier than the second moment; determining that the first sensor is not trusted in response to the first ratio being outside the first ratio range.
Optionally, the apparatus further includes:
the second numerical judgment module is used for responding to the judgment mode at the first moment to obtain a second measured value of the second sensor and a second model calculated value, wherein the second sensor is positioned behind the tail pipe ASC, and the second model calculated value is used for representing the amount of oxynitride after ASC;
and the second credibility judging module is used for judging whether the first sensor is credible or not according to the second measured value, the second model calculated value and the first average temperature.
The second judging and processing module is used for acquiring a second ratio, a fourth average temperature and a second ratio range determined according to the fourth average temperature, wherein the second ratio is a ratio of the second model calculated value to the second measured value, the fourth average temperature is a first average temperature between the first moment and the second moment, and the first moment is earlier than the second moment;
in response to the second ratio being outside the second ratio range, determining that the first sensor is not trusted.
Optionally, the second credibility judgment module includes:
acquiring a second ratio, a fourth average temperature and a second ratio range determined according to the fourth average temperature, wherein the second ratio is a ratio of the second model calculated value to the second measured value, the fourth average temperature is a first average temperature between the first moment and a second moment, and the first moment is earlier than the second moment;
in response to the second ratio being outside the second ratio range, determining that the first sensor is not trusted.
The method and the device for judging the credibility of the sensor provided by the application are described in detail. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing description of the preferred embodiments of the application is not intended to limit the application to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the application are intended to be included within the scope of the application.
Claims (10)
1. A sensor reliability determination method, comprising:
acquiring a first airspeed, a first average temperature, a second average temperature and a first upstream concentration, wherein the first airspeed is the average airspeed of the SCR, the first average temperature is a weighted average value of a first SCR and a first ASC downstream temperature, the second average temperature is a weighted average value of the first SCR and the first SCR downstream temperature, and the first upstream concentration is the oxynitride concentration upstream of the first SCR;
determining a judgment mode according to the first airspeed, the first average temperature, the second average temperature and the first upstream concentration, wherein the judgment mode comprises a first judgment mode and a second judgment mode;
in response to the first time judgment mode being the first judgment mode, acquiring a first measured value and a first model calculated value of a first sensor, the first sensorThe device is NH 3 A sensor located between the first SCR and the second SCR, the first model calculation being indicative of a relationship of ammonia and nitrogen oxides downstream of the first SCR;
the first SCR, the first sensor, the second SCR and the first ASC are sequentially arranged on an exhaust pipeline along the exhaust direction;
and judging whether the first sensor is credible or not according to the first measured value, the first model calculated value and the second average temperature.
2. The method of claim 1, wherein said determining a determination pattern based on said first airspeed, said first average temperature, said second average temperature, and said first upstream concentration comprises:
and determining that the judgment mode at the first moment is a first judgment mode in response to the first airspeed being within an airspeed limit, the change rate of the first airspeed being not greater than an airspeed change limit, the second average temperature being within a second temperature range, the second average temperature change rate being not greater than a second temperature change limit, the first upstream concentration being within a concentration limit and the change rate of the first upstream concentration being not greater than a concentration change limit.
3. The method of claim 1, wherein said determining a determination pattern based on said first airspeed, said first average temperature, said second average temperature, and said first upstream concentration comprises:
and determining that the judgment mode at the first moment is a second judgment mode in response to the first airspeed being within an airspeed limit, the change rate of the first airspeed being not greater than an airspeed change limit, the first average temperature being within a first temperature range, the first average temperature change rate being not greater than a first temperature change limit, the first upstream concentration being within a concentration limit, and the change rate of the first upstream concentration being not greater than a concentration change limit.
4. The method of claim 1, wherein said determining whether said first sensor is authentic based on said first measurement and said first model calculation comprises:
acquiring a first ratio, a third average temperature and a first ratio range determined according to the third average temperature, wherein the first ratio is the ratio of the first model calculated value to the first measured value, the third average temperature is a second average temperature between the first moment and the second moment, and the first moment is earlier than the second moment;
determining that the first sensor is not trusted in response to the first ratio being outside the first ratio range.
5. The method of claim 1, wherein the determining a determination mode based on the first airspeed, the first average temperature, the second average temperature, and the first upstream concentration, the determination mode including a first determination mode and a second determination mode, further comprising, after:
responding to the judging mode at the first moment as the second judging mode, acquiring a second measured value of a second sensor and a second model calculated value, wherein the second sensor is positioned behind the first ASC, and the second model calculated value is used for representing the amount of oxynitride after the first ASC;
and judging whether the first sensor is credible or not according to the second measured value, the second model calculated value and the first average temperature.
6. The method of claim 5, wherein said determining whether the first sensor is authentic based on the second measurement, the second model calculation, and the first average temperature comprises:
acquiring a second ratio, a fourth average temperature and a second ratio range determined according to the fourth average temperature, wherein the second ratio is a ratio of the second model calculated value to the second measured value, the fourth average temperature is a first average temperature between the first moment and a second moment, and the first moment is earlier than the second moment;
in response to the second ratio being outside the second ratio range, determining that the first sensor is not trusted.
7. The sensor credibility judging device is characterized by comprising a first SCR, a first sensor, a second SCR and a first ASC which are sequentially arranged on an exhaust pipeline along the exhaust direction; the first sensor is NH 3 A sensor;
the first information acquisition module is used for acquiring a first airspeed, a first average temperature, a second average temperature and a first upstream concentration, wherein the first airspeed is the average airspeed of the SCR, the first average temperature is a weighted average value of a first SCR and a first ASC downstream temperature, the second average temperature is a weighted average value of the first SCR and the first SCR downstream temperature, and the first upstream concentration is the concentration of oxynitride upstream of the first SCR;
a judgment mode determination module configured to determine a judgment mode according to the first airspeed, the first average temperature, the second average temperature, and the first upstream concentration, the judgment mode including a first judgment mode and a second judgment mode;
the first numerical calculation module is used for responding to the first judging mode at the first moment to obtain a first measured value of a first sensor and a first model calculated value, wherein the first sensor is positioned between the first SCR and the second SCR, and the first model calculated value is used for representing the relation between ammonia and oxynitride downstream of the first SCR;
and the first credibility judging module is used for judging whether the first sensor is credible or not according to the first measured value, the first model calculated value and the second average temperature.
8. The apparatus of claim 7, wherein the judgment mode determination module comprises:
a first judgment mode determination module for determining a judgment mode at a first time as a first judgment mode in response to the first airspeed being within an airspeed limit, the rate of change of the first airspeed being not greater than an airspeed change limit, the second average temperature being within a second temperature range, the second average temperature rate of change being not greater than a second temperature change limit, a first upstream concentration being within a concentration limit, and the rate of change of the first upstream concentration being not greater than a concentration change limit;
and a second judgment mode determining module, responsive to the first airspeed being within an airspeed limit, the rate of change of the first airspeed being no greater than an airspeed change limit, the first average temperature being within a first temperature range, the first average temperature rate of change being no greater than a first temperature change limit, the first upstream concentration being within a concentration limit, and the rate of change of the first upstream concentration being no greater than a concentration change limit, for determining that the judgment mode at the first moment is the second judgment mode.
9. The apparatus of claim 7, wherein the first trust determination module comprises:
the first judgment processing module is used for obtaining a first ratio, a third average temperature and a first ratio range determined according to the third average temperature, wherein the first ratio is the ratio of the first model calculated value to the first measured value, the third average temperature is a second average temperature between the first moment and the second moment, and the first moment is earlier than the second moment; determining that the first sensor is not trusted in response to the first ratio being outside the first ratio range.
10. The apparatus of claim 7, wherein the apparatus further comprises:
the second numerical judgment module is used for responding to the judgment mode at the first moment to obtain a second measured value of a second sensor and a second model calculated value, wherein the second sensor is positioned behind the first ASC, and the second model calculated value is used for representing the amount of oxynitride after the first ASC;
and the second credibility judging module is used for judging whether the first sensor is credible or not according to the second measured value, the second model calculated value and the first average temperature.
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