CN115263504A - Sensor credibility judgment method and device - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 50
- 238000012821 model calculation Methods 0.000 claims abstract description 46
- 238000005259 measurement Methods 0.000 claims abstract description 35
- 230000004044 response Effects 0.000 claims abstract description 30
- 230000008859 change Effects 0.000 claims description 65
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 32
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 28
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 abstract description 13
- 101150105073 SCR1 gene Proteins 0.000 abstract description 13
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 abstract description 13
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 16
- 229910021529 ammonia Inorganic materials 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 101000668165 Homo sapiens RNA-binding motif, single-stranded-interacting protein 1 Proteins 0.000 description 6
- 102100039692 RNA-binding motif, single-stranded-interacting protein 1 Human genes 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 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
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 238000009795 derivation Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- -1 nitrogen oxide compound Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
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- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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Abstract
The application discloses a sensor credibility judgment method and device. When the method is executed, a judgment mode is determined according to the acquired contents by acquiring a first airspeed, a first average temperature, a second average temperature and a first upstream concentration, and in response to the judgment mode at the first moment being the first judgment mode, a first measurement value and a first model calculation value of a first sensor are acquired and whether the first sensor is credible or not is judged. According to NH3Sensor signal to NOx1 signal and SCR1 efficiency relationship, NH3Sensor signal to NOx1 signal, NOx2 signal, and SCR efficiency relationship using NH3Sensor to NOx1 sensor comparison check, NH3Sensor to NOx1 and NOx2 comparison check NH determination alone or in combination3The credibility of the sensor can judge NH more accurately and flexibly3The 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 credibility of a sensor.
Background
Under the large background of pollution reduction and ecological environment protection, SCR (post-positioned selective catalytic conversion device) in the post-treatment of the diesel engine is responsible for removing NOx (NO and NO in automobile exhaust) harmful to the environment in the exhaust2Oxynitride) to N2NH for reducing NOx emissions and emissions from the future3Sensors are preferred for meeting emission consistency.
To meet the efficiency of gas conversion in practical applications, it is usually necessary to integrate NH into the structural system3The credibility of the sensor is judged. Credibility means NH3Whether the value measured by the sensor itself is authentic, i.e. NH3Whether the sensor has a fault. Currently there is no efficient method to determine NH in an aftertreatment system3Sensor credibility.
Disclosure of Invention
In view of this, embodiments of the present application provide a method and an apparatus for determining sensor credibility, which aim to achieve accurate determination of whether sensor detection is performed.
In a first aspect, a method for determining sensor trustworthiness, the method 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 downstream temperatures of a first SCR and a first ASC, the second average temperature is a weighted average of downstream temperatures of the first SCR and the first SCR, and the first upstream concentration is an 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 the first judgment mode of the judgment mode at the first moment, and acquiring a first measurement value and a first model calculation value of a first sensor, wherein the first sensor is positioned between the first SCR and the second SCR, and the first model calculation value is used for representing the relation between ammonia gas and nitrogen oxides at the downstream of the first SCR;
and judging whether the first sensor is credible or not according to the first measurement value, the first model calculation value and the second average temperature.
Optionally, the determining a determination mode according to the first space velocity, the first average temperature, the second average temperature, and the first upstream concentration includes:
in response to the first airspeed being within a range of airspeed limits, the rate of change of the first airspeed being no greater than an airspeed change limit, the second average temperature being within a second temperature range, the second average rate of temperature change being no greater than a second temperature change limit, the first upstream concentration being within a concentration limit, and the first concentration change rate being no greater than a concentration change limit, determining the determination mode at the first time as the first determination mode.
Optionally, the determining a determination mode according to the first space velocity, the first average temperature, the second average temperature, and the first upstream concentration includes:
and in response to the first airspeed being within a range of airspeed limits, 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 rate of change of temperature being no greater than a first temperature change limit, the first upstream concentration being within a concentration limit, and the first concentration rate of change being no greater than a concentration change limit, determining the first-time determination mode as the second determination mode.
Optionally, the determining whether the first sensor is trusted according to the first measurement value and the first model calculation 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 a second moment, and the first moment is earlier than the second moment;
determining that the first sensor is not trustworthy in response to the first ratio not being within the first range of ratios.
Optionally, the determining 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, and then the determining further includes:
acquiring a second measurement value and a second model calculation value of the second sensor in response to the judgment mode at the first moment being the second judgment mode, wherein the second sensor is positioned behind the first ASC, and the second model calculation value is used for representing the amount of nitrogen oxides after the first ASC;
and judging whether the first sensor is credible or not according to the second measurement value, the second model calculation value and the first average temperature.
Optionally, the determining whether the first sensor is trusted according to the second measurement value, the second model calculation 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 the 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;
determining that the first sensor is not trustworthy in response to the second ratio not being within the second ratio range.
In a second aspect, an embodiment of the present application provides a sensor credibility determination 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 of the first SCR and the downstream temperature of the first ASC, the second average temperature is a weighted average of the first SCR and the downstream temperature of the first SCR, and the first upstream concentration is a NOx concentration upstream of the first SCR;
a judgment mode determining 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, where the judgment mode includes a first judgment mode and a second judgment mode;
the first numerical calculation module is used for responding to the first judgment mode at the first moment, acquiring a first measurement value and a first model calculation value of a first sensor, wherein the first sensor is positioned between the first SCR and the second SCR, and the first model calculation value is used for representing the relation between ammonia and nitrogen oxides at the downstream of the first SCR;
and the first credibility judgment module is used for judging whether the first sensor is credible or not according to the first measurement value, the first model calculation value and the second average temperature.
Optionally, the judging mode determining module includes:
and the first judgment mode determination module is used for determining that the judgment mode at the first moment is the first judgment mode in response to the conditions that the first airspeed is within the airspeed limit range, the change rate of the first airspeed is not greater than the airspeed change limit, the second average temperature is within the second temperature range, the second average temperature change rate is not greater than the second temperature change limit, the first upstream concentration is within the concentration limit range, and the first concentration change rate is not greater than the concentration change limit.
And the second judgment mode determination module is used for determining that the judgment mode at the first moment is the second judgment mode in response to the conditions that the first airspeed is within the airspeed limit range, the change rate of the first airspeed is not greater than the airspeed change limit, the first average temperature is within the first temperature range, the first average temperature change rate is not greater than the first temperature change limit, the first upstream concentration is within the concentration limit range, and the first concentration change rate is not greater than the concentration change limit.
Optionally, the first credibility judging module includes:
a first judgment processing module, configured to obtain a first ratio, a third average temperature, and a first ratio range determined according to the third average temperature, where the first ratio is a ratio of the first model calculation value to the first measurement value, the third average temperature is a second average temperature between the first time and a second time, and the first time is earlier than the second time; determining that the first sensor is not trustworthy in response to the first ratio not being within the first range of ratios.
Optionally, the apparatus further comprises:
a second value judging module, configured to, in response to the judgment mode at the first time being the second judgment mode, obtain a second measurement value and a second model calculation value of the second sensor, where the second sensor is located behind the first ASC, and the second model calculation value is 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.
A second judgment processing module, configured to obtain a second ratio, a fourth average temperature, and a second ratio range determined according to the fourth average temperature, where the second ratio is a ratio of the second model calculation value to the second measurement value, the fourth average temperature is a first average temperature between the first time and a second time, and the first time is earlier than the second time;
determining that the first sensor is not trustworthy in response to the second ratio not being within the second ratio range.
Optionally, the second credibility judging 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 the 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;
determining that the first sensor is not trustworthy in response to the second ratio not being within the second ratio range.
The embodiment of the application provides a method and a device for judging the credibility of a sensor. When the method is executed, a judgment mode is determined according to the acquired contents by acquiring a first airspeed, a first average temperature, a second average temperature and a first upstream concentration, and a first measurement value and a first model calculation value of a first sensor are acquired and whether the first sensor is credible or not in response to the judgment mode at a first moment being the first judgment mode. Thus, NH may be used by determining the selection of a mode3Sensor and NOx1 sensor contrast check, NH3Sensor to NOx1 and NOx2 comparison check NH determination alone or in combination3And if the sensor is not credible, selecting an optimal judgment strategy according to real-time data in the post-processing system, and then judging whether the sensor is credible according to the judgment strategy. This is done by mixing NH with the hardware components of the sensor, as opposed to directly detecting the sensor3The relation between the sensor signal and the NOx sensor and the SCR efficiency is compared, and NH can be more accurately judged3The offset of the sensor signal is not trusted.
Drawings
To illustrate the technical solutions in the present embodiment or the prior art more clearly, the drawings needed to be used in the description of the embodiment or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for determining sensor trustworthiness according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of a method of sensor plausibility determination provided in an embodiment of the present application;
FIG. 3 is a schematic structural diagram of an apparatus for determining the authenticity of a sensor according to an embodiment of the present application;
FIG. 4 is a spatial position and signal relationship diagram of sensors provided by an embodiment of the present application;
FIG. 5 shows SCR efficiency and NH according to an embodiment of the present application3And (4) a leakage relation graph.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As mentioned above, the sensors are commonly installed after the catalytic converter SCR in the current exhaust gas treatment process, and since the sensors are installed at the end, the sensor reliability judgment can be made only according to one SCR. However, the inventors have found through research that such a detection method is relatively simple, and the determination is performed only based on the downstream data of the SCR, and when the SCR has an internal failure or the detected data has an error, the determination of the reliability of the ammonia sensor is affected to some extent, and therefore, the accuracy of this determination method is low.
In order to solve the problem, embodiments of the present application provide a method and an apparatus for determining sensor credibility. When the method is executed, a judgment mode is determined according to the acquired contents by acquiring a first airspeed, a first average temperature, a second average temperature and a first upstream concentration, and in response to the judgment mode at the first moment being the first judgment mode, a first measurement value and a first model calculation value of a first sensor are acquired and whether the first sensor is credible or not is judged. Thus, NH may be used by determining the selection of a mode3Sensor and NOx1 sensor contrast check, NH3And judging that the NH3 sensor is not credible by comparing and checking the sensor with the NOx1 and the NOx2 in an independent or combined mode, selecting an optimal judgment strategy according to real-time data in the post-processing system, and judging whether the sensor is credible according to the judgment strategy. In contrast to determining sensor trustworthiness from only one SCR,by thus passing NH3The comparison between the sensor signal and the NOx sensor and SCR efficiency has more accuracy, qualitative and flexibility, and the existing product has no NH3The technical application of the sensor between the SCR1 and the SCR2 does not detect the credibility of the sensor through two conversion devices, and can more accurately judge NH3The offset of the sensor signal is not trusted.
The method provided by the embodiment of the application is executed by a controller, the controller can control various component devices in the system, for example, a temperature sensor, a NOx1 sensor and an injection nozzle DM1, and NH is installed in front of an SCR2 after an SCR13And a NOx2 sensor, a temperature sensor and the like are arranged behind the sensor and the tail pipe ASC. The controller can acquire the detection values of various sensors, wherein the first sensor is positioned between the first SCR (SCR 1) and the second SCR (SCR 2), the second sensor is positioned behind the tail pipe ASC, and the spatial position and signal relationship diagram of the various sensors are shown in the attached figure 4 of the specification.
The following describes a method for determining the reliability of a sensor according to an embodiment of the present invention. Referring to fig. 1, fig. 1 is a flowchart illustrating a method for determining a reliability of a sensor 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.
Wherein the first airspeed is an average airspeed of the SCRs, the first average temperature is a weighted average of the first SCRs and the first ASC downstream temperature, the second average temperature is a weighted average of the first SCRs and the first SCR downstream temperature, and the first upstream concentration is a NOx concentration upstream of the first SCR. The above values can be obtained by the controller in the practical application process.
S102: determining a mode of determination based on the first space velocity, the first average temperature, the second average temperature, and the first upstream concentration.
The judging mode comprises a first judging mode and a second judging mode. The first judgment mode is NH3Checking and comparing mode between sensor and NOx1 sensor, second judging modeFormula is NH3The sensor is compared to the calibration of NOx1 and NOx 2.
In the overall judgment process, the general conditions for diagnostic release mainly include the following: an SCR average space velocity (first space velocity), an SCR average temperature (first average temperature), an SCR1 average temperature (second average temperature), a NOx1 sensor, and the like.
Condition 1: SCR airspeed (first airspeed) is in an upper-lower limit range, the change rate of the airspeed is less than or equal to a limit value, and airspeed condition 1 enables;
condition 2: the SCR average temperature (the weighted average of the SCR1 upstream temperature and the first ASC downstream temperature) is within the upper and lower limit ranges, the change rate of the temperature is less than or equal to the limit value, and the temperature condition 2 enables; wherein the rate of temperature change is calculated by calculating the difference between the ending temperature and the starting temperature over a period of time, this amount being divided by this time.
Condition 3: the average temperature of the SCR1 (the weighted average of the upstream temperature of the SCR1 and the downstream temperature calculated by the SCR1 model) is in the upper and lower limit ranges, the change rate of the temperature is less than or equal to the limit value, and the temperature condition 3 enables;
condition 4: the concentration of NOx (first upstream concentration) at the upstream of the SCR1 is within the upper and lower limits, the change rate of the concentration is less than or equal to the limit value, and the concentration condition 4 enables;
and when the real-time data corresponding to the current moment meet the conditions 1, 3 and 4, executing a first judgment mode.
And when the real-time data corresponding to the current moment meet the conditions 1, 2 and 4, executing a second judgment mode.
By the selection of the above determination mode, NH can be used3Sensor to NOx1 sensor comparison check, NH3Comparison of sensors with NOx1 and NOx2 alone or in combination to determine NH3The sensor is not trusted.
S103: and responding to the first judgment mode of the judgment mode at the first moment, and acquiring a first measurement value and a first model calculation value of the first sensor.
And the first moment is the current detection moment.
When the judgment mode at the current moment is judged to be the first judgment mode, a first measurement value and a first model calculation value of the ammonia sensor are obtained, wherein the first measurement value is directly measured by the current sensor, the first model calculation value is calculated by the controller according to parameters of the NOx1 sensor and the SCR1, namely, the calculation is carried out through a formula (4) in the following derivation process, and the calculated first model calculation value is used for representing the relation between the downstream ammonia gas and the nitrogen oxide compound of the first SCR.
With respect to the formulas required to perform the calculation of the calculated values of the first model,
the SCR efficiency and sensor signal analysis processes are applied as follows:
SCR efficiency and NH as shown in figure 5 of the specification3A leakage relationship diagram from which a model relationship sequence for the configuration of the SCR system can be derived, and for SCR1, an efficiency relationship at steady state can be established:
SCR1 downstream NOx concentration relationship:
NOx_2＝NOx_1_snr*(1-η1) (1)
downstream NH of SCR13Concentration relationship:
NH3_2＝NH3_1-(NOx_1_snr-NOx_2) (2)
relation between injection amount and NOx emission:
where the snr representation is the signal measured by the sensor. anr means to represent the ammonia to nitrogen ratio, i.e. NH injected3Concentration ratio to NOx for eliminating NOx. Eta1Representing the NOx conversion efficiency eta of SCR12Representing the NOx conversion efficiency, eta, of SCR23Representing the NOx conversion efficiency of the ASC.
Obtaining NH at the downstream of the SCR1 through formulas (1), (2) and (3)3Relationship to NOx 1:
NH3_2＝NOx_1_snr*(anr-η1) (4)
the formula is derived according to basic rules, and the existing product has no NH3At this location, the sensor will not detect the authenticity of the sensor. Has the advantages ofA creative contribution.
For SCR2, the efficiency relationship at steady state can be established:
SCR2 downstream NOx concentration relationship:
NOx_3＝NOx_2*(1-η2) (5)
SCR2 downstream NH3Concentration relationship:
NH3_3＝NH3_snr-(NOx_2-NOx_3) (6)
obtaining downstream NH of SCR2 by substituting formula (1) into formulas (5) and (6)3And NOx:
NOx_3＝NOx_1_snr*(1-η1)*(1-η2) (7)
NH3_3＝NH3_snr-NOx_1_snr*(1-η1)η2 (8)
for ASC as well, NH may be applied due to NOx sensors3Measured as NOx, the value of NOx after ASC therefore contains two parts, NOx amount and NH3Leakage amount:
η4: efficiency of Ammonia Oxidation for ASC
Beta: for NOx sensor pair NH3Cross sensitivity of
ds: indicating post-treatment outlet position
S104: and judging whether the first sensor is credible or not according to the first measurement value, the first model calculation 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 a second moment, and the first moment is earlier than the second moment; determining that the first sensor is not trustworthy in response to the first ratio not being within the first ratio range.
In the practical application processWhen the current judgment mode is the first judgment mode, calculating the model NH according to the formula (4)3Calculating an ammonia sensor accumulation value (first measurement value), calculating an average temperature (second average temperature) of the SCR1 during an enable period (a period between a first time and a second time), calculating an ammonia sensor accumulation value and model calculating NH when an integration time exceeds a limit value3When the proportionality coefficient is not within the upper and lower limits (first ratio range) determined based on the average temperature, NH is regarded as3The sensor is not trusted. Wherein the integration time is determined according to a preset value.
In the actual application process, when the current ammonia sensor is judged to be untrustworthy, namely the current sensor has a fault, the controller can send a reminding message or an early warning message to the system display module.
The following describes a method for determining the reliability of a sensor provided in an embodiment of the present application in detail. Referring to fig. 2, fig. 2 is a schematic flowchart of a method for determining the credibility of a sensor according to an embodiment of the present disclosure. 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 obtains real-time data of each component at the current moment, and calculates and integrates to obtain a first airspeed, a first average temperature, a second average temperature and a first upstream concentration.
S202: determining a mode of determination based on the first space velocity, the first average temperature, the second average temperature, and the first upstream concentration.
And determining which judgment mode the current system is applicable to according to the combination condition of the four judgment conditions. The specific determination process is detailed in S102, and is not described herein.
S203: and responding to the second judgment mode of the judgment mode at the first moment, and acquiring a second measurement value and a second model calculation 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 nitrogen oxide after ASC, and may be calculated according to equation (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 the ratio of the second model calculation value to the second measurement 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; determining that the first sensor is not trustworthy in response to the second ratio not being within the second ratio range.
In a practical application scenario, the integrated value of model NOx after ASC (second model calculated value) is calculated according to equation (9), the integrated value of NOx sensor after ASC (second measured value) is calculated, the average temperature of SCR (first average temperature) during the enable period (time interval from the first time to the second time) is calculated, the ratio of the integrated value of NOx sensor to the integrated value of model calculated NOx (second ratio) is calculated when the integration time exceeds the limit value, and NH is considered to be present when the proportionality coefficient is not within the upper and lower limit ranges (second ratio range) determined based on the average temperature3The sensor (first sensor) is not trusted. When the proportionality coefficient is within the second ratio range, the ammonia sensor is considered to be not faulty, and NH is determined3The detection value of the sensor is credible.
The foregoing provides some specific implementation manners of the method for judging the credibility of the sensor for the embodiments of the present application, and based on this, the present application also provides a corresponding apparatus. The device provided by the embodiment of the present application will be described in terms of functional modularity.
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 present disclosure.
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 judgment mode determining module 301, configured to determine a judgment mode according to the first airspeed, the first average temperature, the second average temperature, and the first upstream concentration, where the judgment mode includes a first judgment mode and a second judgment mode;
a first numerical calculation module 302, configured to, in response to the determination mode at the first time being the first determination mode, obtain a first measurement value and a first model calculation value of a first sensor, where the first sensor is located between the first SCR and the second SCR, and the first model calculation value is used to represent a relationship between ammonia and nitrogen oxides downstream of the first SCR;
a first credibility determining module 303, configured to determine whether the first sensor is credible according to the first measurement value, the first model calculation value, and the second average temperature.
Optionally, the judging mode determining module includes:
and the first judgment mode determination module is used for determining that the judgment mode at the first moment is the first judgment mode in response to the conditions that the first airspeed is within the airspeed limit range, the change rate of the first airspeed is not greater than the airspeed change limit, the second average temperature is within the second temperature range, the second average temperature change rate is not greater than the second temperature change limit, the first upstream concentration is within the concentration limit range, and the first concentration change rate is not greater than the concentration change limit.
And the second judgment mode determination module is used for determining that the judgment mode at the first moment is the second judgment mode in response to the conditions that the first airspeed is within the airspeed limit range, the change rate of the first airspeed is not greater than the airspeed change limit, the first average temperature is within the first temperature range, the first average temperature change rate is not greater than the first temperature change limit, the first upstream concentration is within the concentration limit range, and the first concentration change rate is not greater than the concentration change limit.
Optionally, the first credibility judging module includes:
the first judgment processing module is used for 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 calculation value to the first measurement 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 trustworthy in response to the first ratio not being within the first range of ratios.
Optionally, the apparatus further comprises:
a second numerical judgment module, responsive to the judgment mode at the first time being the second judgment mode, configured to obtain a second measurement value and a second model calculation value of the second sensor, where the second sensor is located behind the tailpipe ASC, and the second model calculation value is used to indicate an amount of post-ASC nox;
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.
A second judgment processing module, configured to obtain a second ratio, a fourth average temperature, and a second ratio range determined according to the fourth average temperature, where 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 time and a second time, and the first time is earlier than the second time;
determining that the first sensor is not trustworthy in response to the second ratio not being within the second ratio range.
Optionally, the second credibility judging 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 the 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;
determining that the first sensor is not trustworthy in response to the second ratio not being within the second ratio range.
The above description details a method and an apparatus for determining the credibility of a sensor provided by the present application. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present 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. Also, 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 a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method for determining a reliability of a sensor, comprising:
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 the downstream temperatures of a first SCR and a first ASC, the second average temperature is a weighted average of the downstream temperatures of the first SCR and the first SCR, and the first upstream concentration is an 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 the judgment mode at a first moment in time as the first judgment mode, and acquiring a first measurement value and a first model calculation value of a first sensor, wherein the first sensor is positioned between the first SCR and the second SCR, and the first model calculation value is used for representing the relation between ammonia gas and nitrogen oxides at the downstream of the first SCR;
and judging whether the first sensor is credible or not according to the first measurement value, the first model calculation value and the second average temperature.
2. The method of claim 1, wherein determining a mode of determination based on the first space velocity, the first average temperature, the second average temperature, and the first upstream concentration comprises:
in response to the first airspeed being within a range of airspeed limits, the rate of change of the first airspeed being no greater than an airspeed change limit, the second average temperature being within a second temperature range, the second average rate of temperature change being no greater than a second temperature change limit, the first upstream concentration being within a concentration limit, and the first concentration change rate being no greater than a concentration change limit, determining the determination mode at the first time as the first determination mode.
3. The method of claim 1, wherein determining a mode of determination based on the first space velocity, the first average temperature, the second average temperature, and the first upstream concentration comprises:
and in response to the first airspeed being within a range of airspeed limits, 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 rate of change of temperature being no greater than a first temperature change limit, the first upstream concentration being within a concentration limit, and the first concentration rate of change being no greater than a concentration change limit, determining the first-time determination mode as the second determination mode.
4. The method of claim 1, wherein said determining whether the first sensor is authentic based on the first measurement and the 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 a second moment, and the first moment is earlier than the second moment;
determining that the first sensor is not trustworthy in response to the first ratio not being within the first ratio range.
5. The method of claim 1, wherein determining a mode of determination based on the first space velocity, the first average temperature, the second average temperature, and the first upstream concentration, the mode of determination comprising a first mode of determination and a second mode of determination, further comprises:
acquiring a second measurement value and a second model calculation value of the second sensor in response to the judgment mode at the first moment being the second judgment mode, wherein the second sensor is positioned behind the first ASC, and the second model calculation value is used for representing the amount of nitrogen oxides after the first ASC;
and judging whether the first sensor is credible or not according to the second measurement value, the second model calculation 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 the 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;
determining that the first sensor is not trustworthy in response to the second ratio not being within the second ratio range.
7. A sensor reliability determination device, comprising:
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 of the downstream temperatures of the first SCR and the first ASC, the second average temperature is a weighted average of the downstream temperatures of the first SCR and the first SCR, and the first upstream concentration is an oxynitride concentration upstream of the first SCR;
a judgment mode determining 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, where the judgment mode includes a first judgment mode and a second judgment mode;
the first numerical calculation module is used for responding to the first judgment mode at the first moment, acquiring a first measurement value and a first model calculation value of a first sensor, wherein the first sensor is positioned between the first SCR and the second SCR, and the first model calculation value is used for representing the relation between ammonia gas and nitrogen oxides at the downstream of the first SCR;
and the first credibility judgment module is used for judging whether the first sensor is credible or not according to the first measurement value, the first model calculation value and the second average temperature.
8. The apparatus of claim 7, wherein the determining mode determining module comprises:
a first judgment mode determination module, responsive to that the first airspeed is within an airspeed limit, the change rate of the first airspeed is not greater than an airspeed change limit, the second average temperature is within a second temperature range, the second average temperature change rate is not greater than a second temperature change limit, a first upstream concentration is within a concentration limit, and the first concentration change rate is not greater than a concentration change limit, for determining a judgment mode at a first time as a first judgment mode;
and the second judgment mode determination module is used for determining that the judgment mode at the first moment is the second judgment mode in response to the conditions that the first airspeed is within the airspeed limit range, the change rate of the first airspeed is not greater than the airspeed change limit, the first average temperature is within the first temperature range, the first average temperature change rate is not greater than the first temperature change limit, the first upstream concentration is within the concentration limit range, and the first concentration change rate is not greater than the concentration change limit.
9. The apparatus of claim 7, wherein the first credibility determination module comprises:
the first judgment processing module is used for 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 calculation value to the first measurement 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 trustworthy in response to the first ratio not being within the first range of ratios.
10. The apparatus of claim 7, further comprising:
a second numerical value judging module, configured to, in response to that the judging mode at the first time is the second judging mode, obtain a second measurement value and a second model calculation value of the second sensor, where the second sensor is located behind the first ASC, and the second model calculation value is used to indicate an amount of nitrogen oxides behind 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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