CN108825344B - NO (nitric oxide)xMethod and device for judging reasonability of sensor measurement value - Google Patents
NO (nitric oxide)xMethod and device for judging reasonability of sensor measurement value Download PDFInfo
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- CN108825344B CN108825344B CN201810589341.5A CN201810589341A CN108825344B CN 108825344 B CN108825344 B CN 108825344B CN 201810589341 A CN201810589341 A CN 201810589341A CN 108825344 B CN108825344 B CN 108825344B
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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- 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
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Abstract
The invention relates to the technical field of detection of NOx sensors, and particularly discloses a method for judging the reasonability of a measured value of a NOx sensor, wherein the method comprises the following steps: acquiring actual NOx concentration of an original machine and real-time measured concentration of a NOx sensor; carrying out data processing on the actual NOx concentration of the original machine and the concentration measured by the NOx sensor in real time; comparing the original machine NOx concentration standard deviation with an original machine NOx concentration standard deviation limit value, comparing the NOx sensor concentration standard deviation with an NOx sensor concentration standard deviation limit value and comparing a NOx concentration correlation coefficient with a correlation coefficient limit value; and if the original machine NOx concentration standard deviation is larger than the original machine NOx concentration standard deviation limit value and the NOx sensor concentration standard deviation is not larger than the NOx sensor concentration standard deviation limit value, or the NOx concentration correlation coefficient is smaller than the correlation coefficient limit value, judging that the measured value of the NOx sensor is unreasonable. The invention also discloses a device for judging the reasonability of the measured value of the NOx sensor. The method for judging the reasonability of the measured value of the NOx sensor has the advantage of accurate judgment.
Description
Technical Field
The invention relates to the technical field of detection of NOx sensors, in particular to a method and a device for judging the reasonability of a measured value of a NOx sensor.
Background
In recent years, the vigorous development of the domestic automobile market brings great convenience to people's traffic and causes very serious environmental pollution. Therefore, the ministry of environmental protection has issued a series of regulations for strengthening the standards of automobile exhaust treatment. However, even if the consistency of the emission of the whole vehicle is checked in the production link, the emission of pollutants in the actual use process is not obviously reduced, so that people can realize that the emission control of pollutants must be effective and reliable, and the OBD supervision needs to be enhanced.
NOx is a major pollutant in engine emissions and is harmful, and although there are several ways to reduce NOx emissions, it is still necessary to monitor and control the emissions effectively to ensure that the emissions meet regulatory requirements. The engine NOx emission is mainly measured and feedback controlled by a NOx sensor, and the method is simple and effective, but the reliable work of the NOx sensor must be ensured. At present, the working reliability of the NOx sensor is monitored mainly by focusing on the aspects of dew point detection, electrical and communication faults and the like of the sensor, the NOx sensor cannot work normally due to the problems, the measurement is abnormal, and a general control system can prompt corresponding faults and remind of replacing the sensor. While the other more concealed sensor measurement anomaly is almost ignored, i.e. when the NOx sensor is working properly, the measurement result is not reliable due to other interference.
With the increasingly strict emission control, the signal reasonableness judgment of the NOx sensor in the normal working state is gradually brought into the OBD monitoring coverage range of the automobile emission control, so that the problems of system non-operation, excessive emission and the like caused by abnormal data are prevented, and a post-processing factory is required to develop a strategy suitable for the reasonableness judgment of the measured value of the NOx sensor. A NOx sensor abnormality diagnostic device for use downstream of a NOx adsorber catalyst has been developed in japan, and when the NOx adsorber saturation of the catalyst occurs, the catalyst outlet NOx concentration should coincide with the inlet concentration, and if the downstream NOx sensor measurement does not coincide with the catalyst inlet NOx concentration, it indicates that the sensor signal is not reasonable. The analysis of this method can find that it has the following problems:
(1) in the strategy, the NOx adsorption quantity of the catalyst must be accurately predicted so as to judge whether the rationality of a sensor signal can be judged;
(2) the method is more applicable to Lean NOx Trap (LNT) systems of engines, requires coordinated combustion control of the engine, and is not applicable to other aftertreatment systems and dedicated aftertreatment manufacturers.
(3) The rationality of the NOx sensor detection requires a specific timing and cannot be monitored at any time.
Therefore, how to provide a method capable of accurately judging the reasonability of the measured value of the NOx sensor in real time becomes a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The present invention is directed to solve at least one of the problems of the prior art, and provides a method and a device for determining the rationality of a measured value of a NOx sensor, so as to solve the problems of the prior art.
As a first aspect of the present invention, there is provided a NOx sensor measurement value rationality judgment method, wherein the NOx sensor measurement value rationality judgment method includes:
under the condition that the engine and the NOx sensor work normally, acquiring the actual NOx concentration of the original engine and the real-time measured concentration of the NOx sensor;
carrying out data processing on the actual NOx concentration of the original machine and the concentration measured by the NOx sensor in real time to obtain the standard deviation of the NOx concentration of the original machine, the standard deviation of the NOx sensor concentration and the correlation coefficient of the NOx concentration;
comparing the original machine NOx concentration standard deviation with an original machine NOx concentration standard deviation limit value, comparing the NOx sensor concentration standard deviation with an NOx sensor concentration standard deviation limit value and comparing a NOx concentration correlation coefficient with a correlation coefficient limit value;
and if the original machine NOx concentration standard deviation is larger than the original machine NOx concentration standard deviation limit value and the NOx sensor concentration standard deviation is not larger than the NOx sensor concentration standard deviation limit value, or the NOx concentration correlation coefficient is smaller than the correlation coefficient limit value, judging that the measured value of the NOx sensor is unreasonable.
Preferably, the acquiring the actual NOx concentration of the original machine and the real-time measured concentration of the NOx sensor comprises:
inquiring the original machine NOx concentration map according to the rotating speed of the engine and the circulating oil consumption of the engine to obtain the actual NOx concentration of the original machine;
and acquiring the real-time measured concentration of the NOx sensor through the NOx sensor.
Preferably, the obtaining of the standard deviation of the NOx concentration of the original machine, the standard deviation of the NOx sensor, and the correlation coefficient of the NOx concentration value by performing data processing on the actual NOx concentration of the original machine and the real-time measured concentration of the NOx sensor includes:
calculating to obtain an actual NOx concentration average value of the original machine according to the actual NOx concentration of the original machine, and calculating to obtain a real-time measured concentration average value of the NOx sensor according to the real-time measured concentration of the NOx sensor;
calculating to obtain an actual NOx concentration deviation value of the original machine according to the actual NOx concentration average value of the original machine, and calculating to obtain a real-time measured concentration deviation value of the NOx sensor according to the real-time measured concentration average value of the NOx sensor;
calculating to obtain the actual NOx concentration variance of the original machine according to the actual NOx concentration deviation value of the original machine, and calculating to obtain the real-time measured concentration variance of the NOx sensor according to the real-time measured concentration deviation value of the NOx sensor;
calculating to obtain an actual NOx concentration standard deviation of the original machine according to the actual NOx concentration variance of the original machine, and calculating to obtain a real-time measured concentration standard deviation of the NOx sensor according to the real-time measured concentration variance of the NOx sensor;
and calculating the NOx concentration correlation coefficient according to the actual NOx concentration deviation value of the original machine, the real-time measured concentration deviation value of the NOx sensor, the actual NOx concentration standard deviation of the original machine and the real-time measured concentration standard deviation of the NOx sensor.
Preferably, the obtaining of the actual NOx concentration average value of the original machine by calculation according to the actual NOx concentration of the original machine, and obtaining of the real-time measured concentration average value of the NOx sensor by calculation according to the real-time measured concentration of the NOx sensor includes:
calculating the actual NOx concentration of the original machine by adopting a first-order lag filtering mode to obtain an average value of the actual NOx concentration of the original machine;
and calculating the real-time concentration measured by the NOx sensor in a first-order lag filtering mode to obtain the mean value of the real-time concentration measured by the NOx sensor.
Preferably, the calculating to obtain the actual NOx concentration deviation value of the original machine according to the actual NOx concentration average value of the original machine, and the calculating to obtain the real-time measured concentration deviation value of the NOx sensor according to the real-time measured concentration average value of the NOx sensor includes:
calculating to obtain an actual NOx concentration deviation value of the original machine according to the difference value between the actual NOx concentration of the original machine and the average value of the actual NOx concentration of the original machine;
and calculating to obtain the real-time measured concentration deviation value of the NOx sensor according to the difference value of the real-time measured concentration of the NOx sensor and the average value of the real-time measured concentration of the NOx sensor.
Preferably, the calculating to obtain the actual NOx concentration variance of the original machine according to the actual NOx concentration deviation value of the original machine, and the calculating to obtain the real-time measured concentration variance of the NOx sensor according to the real-time measured concentration deviation value of the NOx sensor includes:
the actual NOx concentration deviation value of the original machine is subjected to power to obtain the actual NOx concentration variance of the original machine;
and obtaining the real-time measured concentration variance of the NOx sensor by taking the real-time measured concentration deviation value of the NOx sensor as a power.
Preferably, the calculating to obtain the actual NOx concentration standard deviation of the original machine according to the actual NOx concentration variance of the original machine, and the calculating to obtain the real-time measured concentration standard deviation of the NOx sensor according to the real-time measured concentration variance of the NOx sensor includes:
calculating the actual NOx concentration variance of the original machine in a first-order lag filtering mode to obtain an actual NOx concentration variance average value of the original machine, and calculating the real-time measured concentration variance of the NOx sensor in a first-order lag filtering mode to obtain a real-time measured concentration variance average value of the NOx sensor;
and extracting the mean value of the actual NOx concentration variance of the original machine to obtain the standard deviation of the actual NOx concentration of the original machine, and extracting the mean value of the concentration variance measured by the NOx sensor in real time to obtain the standard deviation of the concentration measured by the NOx sensor in real time.
Preferably, the calculating the NOx concentration correlation coefficient according to the original machine actual NOx concentration deviation value, the NOx sensor real-time measured concentration deviation value, the original machine actual NOx concentration standard deviation, and the NOx sensor real-time measured concentration standard deviation includes:
multiplying the actual NOx concentration deviation value of the original machine by the real-time measured concentration deviation value of the NOx sensor to obtain a NOx concentration deviation coefficient;
calculating the NOx concentration deviation coefficient by adopting a first-order lag filtering mode to obtain NOx concentration covariance;
multiplying the actual standard deviation of the NOx concentration of the original machine by the standard deviation of the real-time measured concentration of the NOx sensor to obtain a standard deviation coefficient of the NOx concentration;
and dividing the NOx concentration covariance and the NOx concentration standard deviation coefficient to obtain the NOx concentration correlation coefficient.
As a second aspect of the present invention, there is provided a NOx sensor measurement value rationality judgment device, wherein the NOx sensor measurement value rationality judgment device includes:
the acquisition module is used for acquiring the actual NOx concentration of an original engine and the real-time measured concentration of the NOx sensor under the condition that the engine and the NOx sensor are determined to work normally;
the data processing module is used for carrying out data processing on the actual NOx concentration of the original machine and the real-time measured concentration of the NOx sensor to obtain an original machine NOx concentration standard deviation, an NOx sensor concentration standard deviation and an NOx concentration correlation coefficient;
the comparison module is used for comparing the original machine NOx concentration standard deviation with an original machine NOx concentration standard deviation limit value, comparing the NOx sensor concentration standard deviation with an NOx sensor concentration standard deviation limit value and comparing a NOx concentration correlation coefficient with a correlation coefficient limit value;
and the judging module is used for judging that the measured value of the NOx sensor is unreasonable if the original machine NOx concentration standard deviation is larger than the original machine NOx concentration standard deviation limit value and the NOx sensor concentration standard deviation is not larger than the NOx sensor concentration standard deviation limit value or the NOx concentration correlation coefficient is smaller than the correlation coefficient limit value.
Preferably, the obtaining module comprises an original machine actual NOx concentration obtaining unit and a NOx sensor real-time measured concentration obtaining unit, the original machine actual NOx concentration obtaining unit is used for inquiring an original machine NOx concentration map through the rotating speed of an engine and the circulating oil consumption of the engine to obtain the original machine actual NOx concentration, and the NOx sensor real-time measured concentration obtaining unit is used for obtaining the NOx sensor real-time measured concentration through the NOx sensor;
the data processing module comprises an average value calculating unit, a deviation value calculating unit, a variance calculating unit, a standard deviation calculating unit and a correlation coefficient calculating unit, wherein the average value calculating unit is used for calculating to obtain an original actual NOx concentration average value according to the original actual NOx concentration and calculating to obtain a real-time measured concentration average value of the NOx sensor according to the real-time measured concentration of the NOx sensor, the deviation value calculating unit is used for calculating to obtain an original actual NOx concentration deviation value according to the original actual NOx concentration average value and calculating to obtain a real-time measured concentration deviation value of the NOx sensor according to the real-time measured concentration average value of the NOx sensor, the variance calculating unit is used for calculating to obtain an original actual NOx concentration variance according to the original actual NOx concentration deviation value and calculating to obtain a real-time measured concentration variance of the NOx sensor according to the real-time measured concentration, the standard deviation calculating unit is used for calculating to obtain an actual NOx concentration standard deviation of the original machine according to the actual NOx concentration variance of the original machine and calculating to obtain a real-time measured concentration standard deviation of the NOx sensor according to the real-time measured concentration variance of the NOx sensor, and the correlation coefficient calculating unit is used for calculating to obtain the NOx concentration correlation coefficient according to the actual NOx concentration deviation value of the original machine, the real-time measured concentration deviation value of the NOx sensor, the actual NOx concentration standard deviation of the original machine and the real-time measured concentration standard deviation of the NOx sensor;
the comparison module comprises an original machine NOx concentration standard deviation comparison unit, an NOx sensor concentration standard deviation comparison unit and an NOx concentration correlation coefficient comparison unit, wherein the original machine NOx concentration standard deviation comparison unit is used for comparing the original machine NOx concentration standard deviation with an original machine NOx concentration standard deviation limit value, the NOx sensor concentration standard deviation comparison unit is used for comparing the NOx sensor concentration standard deviation with an NOx sensor concentration standard deviation limit value, and the NOx concentration correlation coefficient comparison unit is used for comparing an NOx concentration correlation coefficient with a correlation coefficient limit value;
the judgment module comprises a logical AND operation unit and a logical OR operation unit, the logical AND operation unit is used for carrying out AND operation on the result of the original machine NOx concentration standard deviation comparison unit and the result of the NOx sensor concentration standard deviation comparison unit, the logical OR operation unit is used for carrying out OR operation on the result of the logical AND operation unit and the result of the NOx concentration correlation coefficient comparison unit, and the logical OR operation unit is used for outputting a judgment result.
The method for judging the reasonability of the measured value of the NOx sensor obtains the concentration value of the NOx of the original engine and the measured value of the NOx sensor after the normal work of the engine and the NOx sensor is determined, the deviation, the variance and the standard deviation of two groups are respectively calculated, and whether the measured result of the sensor is reasonable or not is judged through the limit value range of the respective standard deviation or the limit value of the correlation coefficient of the two.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a method for determining the rationality of a measured value of a NOx sensor according to the present invention.
FIG. 2 is a flow chart of an embodiment of NOx sensor measurements provided by the present invention.
FIG. 3 is a logic diagram of the average calculation provided by the present invention.
FIG. 4 is a logic diagram of the calculation of the offset value according to the present invention.
FIG. 5 is a logic diagram of variance calculation provided by the present invention.
FIG. 6 is a logic diagram of the standard deviation calculation provided by the present invention.
Fig. 7 is a logic diagram of covariance calculation provided by the present invention.
Fig. 8 is a logic diagram of the correlation coefficient calculation provided by the present invention.
FIG. 9 is a schematic diagram of the rationality decision logic for NOx sensor measurements provided by the present invention.
Fig. 10 is a schematic structural diagram of a NOx sensor measurement value rationality judgment device provided by the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As a first aspect of the present invention, there is provided a NOx sensor measurement value rationality judgment method, wherein, as shown in fig. 1, the NOx sensor measurement value rationality judgment method includes:
s110, under the condition that the engine and the NOx sensor work normally, acquiring the actual NOx concentration of the original engine and the real-time measured concentration of the NOx sensor;
s120, carrying out data processing on the actual NOx concentration of the original machine and the real-time measured concentration of the NOx sensor to obtain an original machine NOx concentration standard deviation, an NOx sensor concentration standard deviation and an NOx concentration correlation coefficient;
s130, comparing the original machine NOx concentration standard deviation with an original machine NOx concentration standard deviation limit value, comparing the NOx sensor concentration standard deviation with an NOx sensor concentration standard deviation limit value and comparing a NOx concentration correlation coefficient with a correlation coefficient limit value;
s140, if the original machine NOx concentration standard deviation is larger than the original machine NOx concentration standard deviation limit value and the NOx sensor concentration standard deviation is not larger than the NOx sensor concentration standard deviation limit value, or the NOx concentration correlation coefficient is smaller than the correlation coefficient limit value, the measured value of the NOx sensor is judged to be unreasonable.
The method for judging the reasonability of the measured value of the NOx sensor obtains the concentration value of the NOx of the original engine and the measured value of the NOx sensor after the normal work of the engine and the NOx sensor is determined, the deviation, the variance and the standard deviation of two groups are respectively calculated, and whether the measured result of the sensor is reasonable or not is judged through the limit value range of the respective standard deviation or the limit value of the correlation coefficient of the two.
It should be noted that, before the method for judging the reasonableness of the measured value of the NOx sensor in real time, it is first judged whether the engine and the NOx sensor are working normally, and if any one of the engine and the NOx sensor is not in a normal working state, the signal of the NOx sensor is not judged reasonably.
Specifically, as shown in fig. 2, it is first determined whether the engine is operating normally, and if the engine is operating normally, it is determined whether the NOx sensor is operating normally, and if the NOx sensor is operating normally, it is determined whether the measured value of the NOx sensor is reasonable.
As a specific implementation mode, the acquiring of the actual NOx concentration of the original machine and the real-time measured concentration of the NOx sensor comprises:
inquiring the original machine NOx concentration map according to the rotating speed of the engine and the circulating oil consumption of the engine to obtain the actual NOx concentration of the original machine;
and acquiring the real-time measured concentration of the NOx sensor through the NOx sensor.
Further specifically, the obtaining of the standard deviation of the NOx concentration of the original machine, the standard deviation of the NOx sensor concentration and the correlation coefficient of the NOx concentration value by performing data processing on the actual NOx concentration of the original machine and the real-time measured concentration of the NOx sensor includes:
calculating to obtain an actual NOx concentration average value of the original machine according to the actual NOx concentration of the original machine, and calculating to obtain a real-time measured concentration average value of the NOx sensor according to the real-time measured concentration of the NOx sensor;
calculating to obtain an actual NOx concentration deviation value of the original machine according to the actual NOx concentration average value of the original machine, and calculating to obtain a real-time measured concentration deviation value of the NOx sensor according to the real-time measured concentration average value of the NOx sensor;
calculating to obtain the actual NOx concentration variance of the original machine according to the actual NOx concentration deviation value of the original machine, and calculating to obtain the real-time measured concentration variance of the NOx sensor according to the real-time measured concentration deviation value of the NOx sensor;
calculating to obtain an actual NOx concentration standard deviation of the original machine according to the actual NOx concentration variance of the original machine, and calculating to obtain a real-time measured concentration standard deviation of the NOx sensor according to the real-time measured concentration variance of the NOx sensor;
and calculating the NOx concentration correlation coefficient according to the actual NOx concentration deviation value of the original machine, the real-time measured concentration deviation value of the NOx sensor, the actual NOx concentration standard deviation of the original machine and the real-time measured concentration standard deviation of the NOx sensor.
As an embodiment of the calculation of the average value, as shown in fig. 3, the calculating to obtain the original actual NOx concentration average value according to the original actual NOx concentration and the calculating to obtain the real-time measured concentration average value of the NOx sensor according to the real-time measured concentration of the NOx sensor includes:
calculating the actual NOx concentration of the original machine by adopting a first-order lag filtering mode to obtain an average value of the actual NOx concentration of the original machine;
and calculating the real-time concentration measured by the NOx sensor in a first-order lag filtering mode to obtain the mean value of the real-time concentration measured by the NOx sensor.
It should be noted that the first-order lag filter is multiplied by the first-order lag filter coefficient.
As an embodiment of calculating the deviation value, as shown in fig. 4, the calculating the original actual NOx concentration deviation value according to the original actual NOx concentration average value, and calculating the NOx sensor real-time measured concentration deviation value according to the NOx sensor real-time measured concentration average value includes:
calculating to obtain an actual NOx concentration deviation value of the original machine according to the difference value between the actual NOx concentration of the original machine and the average value of the actual NOx concentration of the original machine;
and calculating to obtain the real-time measured concentration deviation value of the NOx sensor according to the difference value of the real-time measured concentration of the NOx sensor and the average value of the real-time measured concentration of the NOx sensor.
As a specific implementation of the calculation of the variance, as shown in fig. 5, the calculating the original actual NOx concentration variance according to the original actual NOx concentration deviation value and the calculating the real-time measured concentration variance of the NOx sensor according to the real-time measured concentration deviation value of the NOx sensor includes:
the actual NOx concentration deviation value of the original machine is subjected to power to obtain the actual NOx concentration variance of the original machine;
and obtaining the real-time measured concentration variance of the NOx sensor by taking the real-time measured concentration deviation value of the NOx sensor as a power.
As a specific embodiment of the calculation of the standard deviation, as shown in fig. 5 and fig. 6, the calculating to obtain the standard deviation of the actual NOx concentration of the original machine according to the variance of the actual NOx concentration of the original machine, and calculating to obtain the standard deviation of the real-time measured concentration of the NOx sensor according to the variance of the real-time measured concentration of the NOx sensor includes:
calculating the actual NOx concentration variance of the original machine in a first-order lag filtering mode to obtain an actual NOx concentration variance average value of the original machine, and calculating the real-time measured concentration variance of the NOx sensor in a first-order lag filtering mode to obtain a real-time measured concentration variance average value of the NOx sensor;
and extracting the mean value of the actual NOx concentration variance of the original machine to obtain the standard deviation of the actual NOx concentration of the original machine, and extracting the mean value of the concentration variance measured by the NOx sensor in real time to obtain the standard deviation of the concentration measured by the NOx sensor in real time.
As a specific implementation of the calculation of the correlation coefficient, as shown in fig. 7 and 8, the calculating the NOx concentration correlation coefficient according to the original actual NOx concentration deviation value, the NOx sensor real-time measured concentration deviation value, the original actual NOx concentration standard deviation, and the NOx sensor real-time measured concentration standard deviation includes:
multiplying the actual NOx concentration deviation value of the original machine by the real-time measured concentration deviation value of the NOx sensor to obtain a NOx concentration deviation coefficient;
calculating the NOx concentration deviation coefficient by adopting a first-order lag filtering mode to obtain NOx concentration covariance;
multiplying the actual standard deviation of the NOx concentration of the original machine by the standard deviation of the real-time measured concentration of the NOx sensor to obtain a standard deviation coefficient of the NOx concentration;
and dividing the NOx concentration covariance and the NOx concentration standard deviation coefficient to obtain the NOx concentration correlation coefficient.
It should be appreciated that after the engine and NOx sensors are guaranteed to operate properly and data processing is complete, a logical determination of signal reasonableness is made as shown in fig. 9 to determine whether the standard deviation or correlation coefficient is within the limit. If the standard deviation of the NOx concentration of the original machine is larger than the limit value, the standard deviation of the concentration of the sensor does not exceed the limit value, or the correlation coefficient of the NOx concentration is lower than the limit value, the measured value of the NOx sensor is unreasonable, otherwise, the data is normal.
Therefore, the method for judging the reasonability of the measured value of the NOx sensor has the following advantages: (1) the logic is clear and easy to understand, and the calculation process is simple. As long as the engine and the sensor work normally, rationality detection can be carried out; (2) no extra signal input or hardware change is needed, the required signals are few, the cost is low, and the realization is convenient. As long as the engine and the sensor work normally, the reasonability detection can be carried out, no additional limiting condition exists, and the high-frequency detection can be realized; (3) the rationality detection of the upstream and downstream sensor signals of the catalyst can be realized simultaneously; (4) the method has the advantage of high accuracy through the dual-mode comparison and judgment of the correlation coefficient and the standard deviation.
As a second aspect of the present invention, there is provided a NOx sensor measurement value rationality judgment device, wherein, as shown in fig. 10, the NOx sensor measurement value rationality judgment device 10 includes:
the acquisition module 110 is used for acquiring the actual NOx concentration of an original machine and the real-time measured concentration of the NOx sensor under the condition that the engine and the NOx sensor are determined to work normally;
the data processing module 120 is configured to perform data processing on the actual NOx concentration and the real-time measured concentration of the NOx sensor of the original machine to obtain an NOx concentration standard deviation, an NOx sensor concentration standard deviation, and an NOx concentration correlation coefficient of the original machine;
a comparison module 130, the comparison module 130 configured to compare the original NOx concentration standard deviation to an original NOx concentration standard deviation limit, to compare the NOx sensor concentration standard deviation to a NOx sensor concentration standard deviation limit, and to compare a NOx concentration correlation coefficient to a correlation coefficient limit;
a determination module 140, where the determination module 140 is configured to determine that the measured value of the NOx sensor is not reasonable if the original NOx concentration standard deviation is greater than the original NOx concentration standard deviation limit and the NOx sensor concentration standard deviation is not greater than the NOx sensor concentration standard deviation limit, or the NOx concentration correlation coefficient is less than the correlation coefficient limit.
The device for judging the reasonability of the measured value of the NOx sensor obtains the concentration value of the NOx of the original machine and the measured value of the NOx sensor after the normal work of the engine and the NOx sensor is determined, the deviation, the variance and the standard deviation of two groups are respectively calculated, and whether the measured result of the sensor is reasonable or not is judged through the limit value range of the respective standard deviation or the limit value of the correlation coefficient of the two.
As a specific implementation manner, the obtaining module 110 includes an original machine actual NOx concentration obtaining unit and a NOx sensor real-time measured concentration obtaining unit, where the original machine actual NOx concentration obtaining unit is configured to obtain an original machine actual NOx concentration by querying an original machine NOx concentration map through an engine rotation speed and an engine circulating oil consumption, and the NOx sensor real-time measured concentration obtaining unit is configured to obtain a NOx sensor real-time measured concentration through a NOx sensor;
the data processing module 120 comprises a mean value calculating unit, a deviation value calculating unit, a variance calculating unit, a standard deviation calculating unit and a correlation coefficient calculating unit, wherein the mean value calculating unit is used for calculating an original actual NOx concentration mean value according to the original actual NOx concentration and calculating a real-time measured concentration mean value of the NOx sensor according to the real-time measured concentration of the NOx sensor, the deviation value calculating unit is used for calculating an original actual NOx concentration deviation value according to the original actual NOx concentration mean value and calculating a real-time measured concentration deviation value of the NOx sensor according to the real-time measured concentration mean value of the NOx sensor, the variance calculating unit is used for calculating an original actual NOx concentration deviation value according to the original actual NOx concentration deviation value and calculating a real-time measured concentration variance of the NOx sensor according to the real-time measured concentration deviation value of the NOx sensor, the standard deviation calculating unit is used for calculating to obtain an actual NOx concentration standard deviation of the original machine according to the actual NOx concentration variance of the original machine and calculating to obtain a real-time measured concentration standard deviation of the NOx sensor according to the real-time measured concentration variance of the NOx sensor, and the correlation coefficient calculating unit is used for calculating to obtain the NOx concentration correlation coefficient according to the actual NOx concentration deviation value of the original machine, the real-time measured concentration deviation value of the NOx sensor, the actual NOx concentration standard deviation of the original machine and the real-time measured concentration standard deviation of the NOx sensor;
the comparison module 130 comprises an original machine NOx concentration standard deviation comparison unit, a NOx sensor concentration standard deviation comparison unit and a NOx concentration correlation coefficient comparison unit, wherein the original machine NOx concentration standard deviation comparison unit is used for comparing the original machine NOx concentration standard deviation with an original machine NOx concentration standard deviation limit value, the NOx sensor concentration standard deviation comparison unit is used for comparing the NOx sensor concentration standard deviation with a NOx sensor concentration standard deviation limit value, and the NOx concentration correlation coefficient comparison unit is used for comparing a NOx concentration correlation coefficient with a correlation coefficient limit value;
the determination module 140 includes a logical and operation unit and a logical or operation unit, the logical and operation unit is configured to and-operate a result of the original NOx concentration standard deviation comparison unit and a result of the NOx sensor concentration standard deviation comparison unit, the logical or operation unit is configured to or-operate a result of the logical and operation unit and a result of the NOx concentration correlation coefficient comparison unit, and the logical or operation unit is configured to output a determination result.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A method for determining the rationality of a measurement value of a NOx sensor, characterized by comprising:
under the condition that the engine and the NOx sensor work normally, acquiring the actual NOx concentration of the original engine and the real-time measured concentration of the NOx sensor;
carrying out data processing on the actual NOx concentration of the original machine and the concentration measured by the NOx sensor in real time to obtain the standard deviation of the NOx concentration of the original machine, the standard deviation of the NOx sensor concentration and the correlation coefficient of the NOx concentration;
comparing the original machine NOx concentration standard deviation with an original machine NOx concentration standard deviation limit value, comparing the NOx sensor concentration standard deviation with an NOx sensor concentration standard deviation limit value and comparing a NOx concentration correlation coefficient with a correlation coefficient limit value;
and if the original machine NOx concentration standard deviation is larger than the original machine NOx concentration standard deviation limit value and the NOx sensor concentration standard deviation is not larger than the NOx sensor concentration standard deviation limit value, or the NOx concentration correlation coefficient is smaller than the correlation coefficient limit value, judging that the measured value of the NOx sensor is unreasonable.
2. The method for judging the reasonableness of the measured value of the NOx sensor according to claim 1, wherein the acquiring the actual NOx concentration of the original machine and the real-time measured concentration of the NOx sensor includes:
inquiring the original machine NOx concentration map according to the rotating speed of the engine and the circulating oil consumption of the engine to obtain the actual NOx concentration of the original machine;
and acquiring the real-time measured concentration of the NOx sensor through the NOx sensor.
3. The method for judging the reasonableness of the measured value of the NOx sensor according to claim 2, wherein the step of carrying out data processing on the actual NOx concentration of the original machine and the real-time measured concentration of the NOx sensor to obtain the standard deviation of the NOx concentration of the original machine, the standard deviation of the concentration of the NOx sensor and the correlation coefficient of the concentration value of the NOx comprises the following steps:
calculating to obtain an actual NOx concentration average value of the original machine according to the actual NOx concentration of the original machine, and calculating to obtain a real-time measured concentration average value of the NOx sensor according to the real-time measured concentration of the NOx sensor;
calculating to obtain an actual NOx concentration deviation value of the original machine according to the actual NOx concentration average value of the original machine, and calculating to obtain a real-time measured concentration deviation value of the NOx sensor according to the real-time measured concentration average value of the NOx sensor;
calculating to obtain the actual NOx concentration variance of the original machine according to the actual NOx concentration deviation value of the original machine, and calculating to obtain the real-time measured concentration variance of the NOx sensor according to the real-time measured concentration deviation value of the NOx sensor;
calculating to obtain an actual NOx concentration standard deviation of the original machine according to the actual NOx concentration variance of the original machine, and calculating to obtain a real-time measured concentration standard deviation of the NOx sensor according to the real-time measured concentration variance of the NOx sensor;
and calculating the NOx concentration correlation coefficient according to the actual NOx concentration deviation value of the original machine, the real-time measured concentration deviation value of the NOx sensor, the actual NOx concentration standard deviation of the original machine and the real-time measured concentration standard deviation of the NOx sensor.
4. The method for judging the reasonableness of the measured value of the NOx sensor according to claim 3, wherein the calculating an average value of the actual NOx concentration of the original machine from the actual NOx concentration of the original machine, and calculating an average value of the real-time measured concentration of the NOx sensor from the real-time measured concentration of the NOx sensor comprise:
calculating the actual NOx concentration of the original machine by adopting a first-order lag filtering mode to obtain an average value of the actual NOx concentration of the original machine;
and calculating the real-time concentration measured by the NOx sensor in a first-order lag filtering mode to obtain the mean value of the real-time concentration measured by the NOx sensor.
5. The method for judging the reasonableness of the measured values of the NOx sensor according to claim 3, wherein the step of calculating the actual NOx concentration deviation value of the original machine according to the average value of the actual NOx concentration of the original machine and the step of calculating the real-time measured concentration deviation value of the NOx sensor according to the average value of the real-time measured concentration of the NOx sensor comprise the steps of:
calculating to obtain an actual NOx concentration deviation value of the original machine according to the difference value between the actual NOx concentration of the original machine and the average value of the actual NOx concentration of the original machine;
and calculating to obtain the real-time measured concentration deviation value of the NOx sensor according to the difference value of the real-time measured concentration of the NOx sensor and the average value of the real-time measured concentration of the NOx sensor.
6. The method for judging the reasonableness of the measured value of the NOx sensor according to claim 3, wherein the calculating of the actual NOx concentration variance of the original machine from the actual NOx concentration deviation value of the original machine and the calculating of the real-time measured concentration variance of the NOx sensor from the real-time measured concentration deviation value of the NOx sensor comprise:
the actual NOx concentration deviation value of the original machine is subjected to power to obtain the actual NOx concentration variance of the original machine;
and obtaining the real-time measured concentration variance of the NOx sensor by taking the real-time measured concentration deviation value of the NOx sensor as a power.
7. The method for judging the reasonableness of the measured value of the NOx sensor according to claim 6, wherein the calculating to obtain the standard deviation of the actual NOx concentration of the original machine according to the actual variance of the NOx concentration of the original machine, and the calculating to obtain the standard deviation of the real-time measured concentration of the NOx sensor according to the real-time measured variance of the concentration of the NOx sensor comprises:
calculating the actual NOx concentration variance of the original machine in a first-order lag filtering mode to obtain an actual NOx concentration variance average value of the original machine, and calculating the real-time measured concentration variance of the NOx sensor in a first-order lag filtering mode to obtain a real-time measured concentration variance average value of the NOx sensor;
and extracting the mean value of the actual NOx concentration variance of the original machine to obtain the standard deviation of the actual NOx concentration of the original machine, and extracting the mean value of the concentration variance measured by the NOx sensor in real time to obtain the standard deviation of the concentration measured by the NOx sensor in real time.
8. The method for determining the rationality of the measured value of the NOx sensor according to claim 7, wherein the calculating the NOx concentration correlation coefficient based on the original machine actual NOx concentration deviation value, the NOx sensor real-time measured concentration deviation value, the original machine actual NOx concentration standard deviation, and the NOx sensor real-time measured concentration standard deviation includes:
multiplying the actual NOx concentration deviation value of the original machine by the real-time measured concentration deviation value of the NOx sensor to obtain a NOx concentration deviation coefficient;
calculating the NOx concentration deviation coefficient by adopting a first-order lag filtering mode to obtain NOx concentration covariance;
multiplying the actual standard deviation of the NOx concentration of the original machine by the standard deviation of the real-time measured concentration of the NOx sensor to obtain a standard deviation coefficient of the NOx concentration;
and dividing the NOx concentration covariance and the NOx concentration standard deviation coefficient to obtain the NOx concentration correlation coefficient.
9. A NOx sensor measurement value rationality judgment device characterized by comprising:
the acquisition module is used for acquiring the actual NOx concentration of an original engine and the real-time measured concentration of the NOx sensor under the condition that the engine and the NOx sensor are determined to work normally;
the data processing module is used for carrying out data processing on the actual NOx concentration of the original machine and the real-time measured concentration of the NOx sensor to obtain an original machine NOx concentration standard deviation, an NOx sensor concentration standard deviation and an NOx concentration correlation coefficient;
the comparison module is used for comparing the original machine NOx concentration standard deviation with an original machine NOx concentration standard deviation limit value, comparing the NOx sensor concentration standard deviation with an NOx sensor concentration standard deviation limit value and comparing a NOx concentration correlation coefficient with a correlation coefficient limit value;
and the judging module is used for judging that the measured value of the NOx sensor is unreasonable if the original machine NOx concentration standard deviation is larger than the original machine NOx concentration standard deviation limit value and the NOx sensor concentration standard deviation is not larger than the NOx sensor concentration standard deviation limit value or the NOx concentration correlation coefficient is smaller than the correlation coefficient limit value.
10. The NOx sensor measurement value rationality judging device according to claim 9,
the acquisition module comprises an original machine actual NOx concentration acquisition unit and a NOx sensor real-time measurement concentration acquisition unit, wherein the original machine actual NOx concentration acquisition unit is used for inquiring an original machine NOx concentration map through the rotating speed of an engine and the circulating oil consumption of the engine to acquire the original machine actual NOx concentration, and the NOx sensor real-time measurement concentration acquisition unit is used for acquiring the real-time measurement concentration of the NOx sensor through the NOx sensor;
the data processing module comprises an average value calculating unit, a deviation value calculating unit, a variance calculating unit, a standard deviation calculating unit and a correlation coefficient calculating unit, wherein the average value calculating unit is used for calculating to obtain an original actual NOx concentration average value according to the original actual NOx concentration and calculating to obtain a real-time measured concentration average value of the NOx sensor according to the real-time measured concentration of the NOx sensor, the deviation value calculating unit is used for calculating to obtain an original actual NOx concentration deviation value according to the original actual NOx concentration average value and calculating to obtain a real-time measured concentration deviation value of the NOx sensor according to the real-time measured concentration average value of the NOx sensor, the variance calculating unit is used for calculating to obtain an original actual NOx concentration variance according to the original actual NOx concentration deviation value and calculating to obtain a real-time measured concentration variance of the NOx sensor according to the real-time measured concentration, the standard deviation calculating unit is used for calculating to obtain an actual NOx concentration standard deviation of the original machine according to the actual NOx concentration variance of the original machine and calculating to obtain a real-time measured concentration standard deviation of the NOx sensor according to the real-time measured concentration variance of the NOx sensor, and the correlation coefficient calculating unit is used for calculating to obtain the NOx concentration correlation coefficient according to the actual NOx concentration deviation value of the original machine, the real-time measured concentration deviation value of the NOx sensor, the actual NOx concentration standard deviation of the original machine and the real-time measured concentration standard deviation of the NOx sensor;
the comparison module comprises an original machine NOx concentration standard deviation comparison unit, an NOx sensor concentration standard deviation comparison unit and an NOx concentration correlation coefficient comparison unit, wherein the original machine NOx concentration standard deviation comparison unit is used for comparing the original machine NOx concentration standard deviation with an original machine NOx concentration standard deviation limit value, the NOx sensor concentration standard deviation comparison unit is used for comparing the NOx sensor concentration standard deviation with an NOx sensor concentration standard deviation limit value, and the NOx concentration correlation coefficient comparison unit is used for comparing an NOx concentration correlation coefficient with a correlation coefficient limit value;
the judgment module comprises a logical AND operation unit and a logical OR operation unit, the logical AND operation unit is used for carrying out AND operation on the result of the original machine NOx concentration standard deviation comparison unit and the result of the NOx sensor concentration standard deviation comparison unit, the logical OR operation unit is used for carrying out OR operation on the result of the logical AND operation unit and the result of the NOx concentration correlation coefficient comparison unit, and the logical OR operation unit is used for outputting a judgment result.
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| CN111931132B (en) * | 2020-09-27 | 2020-12-22 | 浙江浙能技术研究院有限公司 | Flue gas NOX concentration abnormal value processing method based on standard deviation and median absolute deviation |
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