CN114263520B - Detecting NO x Method and device for sensor precision - Google Patents
Detecting NO x Method and device for sensor precision Download PDFInfo
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Abstract
The application relates to the technical field of data processing, and discloses a method and a device for detecting the accuracy of a NOx sensor, wherein a first concentration value of nitrogen oxide is detected through the NOx sensor, and if a first difference value between the first concentration value and a corrected reference concentration value is larger than a first preset threshold value and not larger than a second preset threshold value, the first concentration value of the nitrogen oxide is detected again after urea injection quantity is increased; the corrected reference concentration value is obtained by correcting a prestored reference concentration value of the nitrogen oxide based on an engine aging factor, and the engine aging factor is determined according to the total running time of the engine; and if the first difference value between the first concentration value and the corrected reference concentration value is not greater than a first preset threshold value, determining that the accuracy of the NOx sensor meets a first accuracy value, so that the concentration of the nitrogen oxides can be accurately measured by using the NOx sensor.
Description
Technical Field
The present application relates to the field of data processing technologies, and in particular, to a method and an apparatus for detecting accuracy of a NOx sensor.
Background
With the tightening of vehicle exhaust emission regulations and the reduction of diesel engine emission limits, the requirement on the precision of a nitrogen oxide NOx sensor in a vehicle is higher and higher. In the prior art, a Selective Catalytic Reduction (SCR) system, that is, an NOx sensor provided in an aftertreatment system, is used for emission monitoring, and if the monitored NOx emission exceeds a specified emission requirement, a vehicle diagnosis system limits the torque and the vehicle speed of a vehicle, so that the vehicle cannot normally run.
At present, a NOx sensor is generally used to collect the instantaneous wet-based concentration of NOx in vehicle exhaust and obtain the instantaneous exhaust flow rate in the vehicle, then the instantaneous NOx exhaust flow rate is obtained according to the instantaneous wet-based concentration and the instantaneous exhaust flow rate of NOx, then the instantaneous power is obtained by collecting the instantaneous torque and the instantaneous rotational speed of the engine, and finally the concentration of NOx is obtained based on the instantaneous NOx exhaust flow rate and the instantaneous power. However, in the case that the accuracy of the NOx sensor itself is not accurate, the concentration of the finally obtained NOx is also not accurate, and therefore, a method for detecting the accuracy of the NOx sensor is required, which can accurately measure the concentration of the nitrogen oxide.
Disclosure of Invention
The embodiment of the application provides a method and a device for detecting the accuracy of a NOx sensor, so that the concentration of nitrogen oxide can be accurately measured by using the NOx sensor.
In a first aspect, an embodiment of the present application provides a method for detecting accuracy of a NOx sensor, where the method includes:
detecting a first concentration value of nitrogen oxides by a NOx sensor;
if a first difference value between the first concentration value and the corrected reference concentration value is greater than a first preset threshold value and not greater than a second preset threshold value, increasing the urea injection amount and then re-executing the step of detecting the first concentration value of nitrogen oxides through the NOx sensor; the corrected reference concentration value is obtained by correcting a prestored nitrogen oxide reference concentration value based on an engine aging factor, and the engine aging factor is determined according to the total running time of the engine;
and if a first difference value between the first concentration value and the corrected reference concentration value is not larger than the first preset threshold value, determining that the accuracy of the NOx sensor meets a first accuracy value.
According to the method, firstly, an engine aging factor is determined by combining the total running time of an engine, a pre-stored reference concentration value of nitrogen oxide is corrected by the aid of the determined engine aging factor, then a first difference value between a first concentration value of the nitrogen oxide detected by a NOx sensor and the corrected reference concentration value is compared with a first preset threshold value and a second preset threshold value, and the precision value of the NOx sensor is accurately determined again by changing the urea injection amount, so that the nitrogen oxide concentration can be accurately measured by the aid of the NOx sensor.
Optionally, after determining that a first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, the method further includes:
re-executing the step of detecting the first concentration value of nitrogen oxides by the NOx sensor after reducing the current urea injection quantity, wherein the magnitude of reducing the urea injection quantity is smaller than the magnitude of increasing the urea injection quantity;
and if a first difference value between the first concentration value and the corrected reference concentration value is not larger than the first preset threshold value, determining that the accuracy of the NOx sensor meets a second accuracy value, wherein the first accuracy value is larger than the second accuracy value.
According to the method and the device, the urea injection amount is adjusted again on the premise that the accuracy of the NOx sensor is determined to meet the first accuracy value, if the redetected first difference value is not larger than the first preset threshold value, the accuracy of the NOx sensor is further determined to meet the second accuracy value, and the first accuracy value is larger than the second accuracy value, so that the nitrogen oxide concentration can be measured by using the more accurate NOx sensor.
Optionally, before the detecting the first concentration value of nitrogen oxides by the NOx sensor, the method further includes:
it is determined that a rotational speed value of an engine and a torque value of the engine are fixed for a specified period of time at a present time.
According to the method and the device, the first concentration value of the nitrogen oxide can be detected by the NOx sensor more accurately when the engine is in a stable rotating speed and stable torque state.
Optionally, the corrected reference concentration value is determined by:
determining the engine aging factor based on the total running time of the engine at the current moment and a first specified aging coefficient;
determining a product of the pre-stored reference concentration value of NOx and the engine aging factor as the corrected reference concentration value.
According to the method and the device, the influence of the running time of the engine on the engine is considered, the engine aging factor is determined, the pre-stored reference concentration value of the nitrogen oxide is corrected by the engine aging factor, and therefore the corrected reference concentration value can be used for being more accurately compared with the first concentration value of the nitrogen oxide detected by the NOx sensor.
Optionally, before the detecting the first concentration value of nitrogen oxides by the NOx sensor, the method further includes:
determining that the dew point temperature value of the NOx sensor is within a specified temperature value range.
According to the method and the device, before the NOx sensor is controlled to start to detect the concentration of the nitrogen oxide, the dew point temperature value of the NOx sensor is determined to be within the range of the specified temperature value, so that the concentration of the nitrogen oxide can be detected by the NOx sensor more accurately.
In a second aspect, an embodiment of the present application provides an apparatus for detecting accuracy of a NOx sensor, the apparatus including:
the detection module is used for detecting a first concentration value of nitrogen oxide through the NOx sensor;
a comparison module, configured to, if a first difference between the first concentration value and the corrected reference concentration value is greater than a first preset threshold and not greater than a second preset threshold, increase an urea injection amount and then perform the step of detecting the first concentration value of nitrogen oxides again through the NOx sensor; the corrected reference concentration value is obtained by correcting a prestored reference concentration value of nitrogen oxides based on an engine aging factor, and the engine aging factor is determined according to the total running time of the engine;
a determining module, configured to determine that the accuracy of the NOx sensor satisfies a first accuracy value if a first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold.
Optionally, after determining that a first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, the determining module is further configured to:
re-executing the step of detecting the first concentration value of nitrogen oxides by the NOx sensor after reducing the current urea injection quantity, wherein the magnitude of reducing the urea injection quantity is smaller than the magnitude of increasing the urea injection quantity;
and if a first difference value between the first concentration value and the corrected reference concentration value is not larger than the first preset threshold value, determining that the accuracy of the NOx sensor meets a second accuracy value, wherein the first accuracy value is larger than the second accuracy value.
Optionally, before detecting the first concentration value of nitrogen oxide by the NOx sensor, the detecting module is further configured to:
determining that the rotating speed value of the engine and the torque value of the engine in the specified time period at the current moment are fixed.
Optionally, the corrected reference concentration value is determined by:
determining the engine aging factor based on the total running time of the engine at the current moment and a first specified aging coefficient;
determining a product of the pre-stored reference concentration value of NOx and the engine aging factor as the corrected reference concentration value.
Optionally, before detecting the first concentration value of the nitrogen oxide by the NOx sensor, the detection module is further configured to:
determining that the dew point temperature value of the NOx sensor is within a specified temperature value range.
In a third aspect, an embodiment of the present application further provides an electronic device, including:
a processor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to execute the instructions to implement any of the methods as provided in the first aspect of the application.
In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, where instructions, when executed by a processor of an electronic device, enable the electronic device to perform any one of the methods as provided in the first aspect of the present application.
In a fifth aspect, an embodiment of the present application provides a computer program product comprising computer programs/instructions which, when executed by a processor, implement any of the methods as provided in the first aspect of the present application.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below 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 schematic flow chart diagram illustrating a method for detecting the accuracy of a NOx sensor according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart illustrating a method for detecting the accuracy of a NOx sensor according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of an apparatus for detecting the accuracy of a NOx sensor according to an embodiment of the present disclosure;
fig. 4 is a schematic view of an electronic device according to an embodiment of the application.
Detailed Description
In order to make the technical solutions of the present application better understood by those of ordinary skill in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
At present, with the strictness of vehicle exhaust emission regulations and the reduction of diesel engine emission limits, the requirement on the accuracy of a NOx sensor in a vehicle is higher and higher. In the prior art, an NOx sensor of an SCR system is used for emission monitoring, if the monitored NOx emission exceeds a specified emission requirement, a vehicle diagnosis system can limit the torque and the vehicle speed of a vehicle, so that the vehicle cannot run normally, and therefore the NOx sensor is required to accurately measure the concentration of nitrogen oxides.
For this purpose, the present application proposes a method for detecting the accuracy of a NOx sensor, which compares a first difference between a first concentration value of a NOx concentration detected by the NOx sensor and a corrected reference concentration value with a first preset threshold value and a second preset threshold value, and determines the accuracy of the NOx sensor again accurately by changing the urea injection amount.
Having described the concepts of the embodiments of the present application, reference will now be made in detail to the embodiments of the present application as illustrated in the accompanying drawings. Although the embodiments of the present application provide method operation steps as shown in the following embodiments or figures, more or fewer operation steps may be included in the methods based on conventional or non-inventive efforts. In steps where no necessary causal relationship exists logically, the order of execution of the steps is not limited to that provided by the embodiments of the present application.
Referring to fig. 1, a method of detecting the accuracy of a NOx sensor is shown, comprising in particular the steps of:
s101, detecting a first concentration value of nitrogen oxides through a NOx sensor.
In an embodiment of the present application, after an Electronic Control Unit (ECU) in a vehicle is powered on, an engine starts to operate. In the engine running state, the NOx sensor needs to operate in a low-temperature environment, and when water vapor exists in the NOx sensor, the water vapor condenses into water droplets, so that the NOx sensor cracks, thereby causing the NOx sensor to be damaged. Therefore, in order to ensure that the NOx sensor can work normally and ensure the accuracy of detecting the first concentration value of nitrogen oxides by the NOx sensor, dew point detection can be performed on the NOx sensor, for example, the dew point temperature value of the NOx sensor is detected to be within a specified temperature value range.
After the dew point detection is completed on the NOx sensor, in order to ensure the accuracy of the detection by the NOx sensor, the first concentration value of nitrogen oxides may be detected by the NOx sensor with the rotation speed value of the engine and the torque value of the engine fixed during a specified period of time at the present time.
S102, if a first difference value between the first concentration value and the corrected reference concentration value is larger than a first preset threshold value and not larger than a second preset threshold value, increasing the urea injection amount and then executing the step of detecting the first concentration value of the nitrogen oxides through the NOx sensor again.
The corrected reference concentration value is obtained by correcting a prestored reference concentration value of the nitrogen oxide based on an engine aging factor, and the engine aging factor is determined according to the total running time of the engine. Determining a corrected reference concentration value by:
and determining an engine aging factor based on the total running time of the engine at the current moment and the first designated aging coefficient, and determining the product of the pre-stored reference concentration value of the nitrogen oxides and the engine aging factor as the corrected reference concentration value. Namely, the engine aging factor = the current total operating time of the engine × the first designated aging coefficient, and the corrected reference concentration value = the engine aging factor × the reference concentration value of the nitrogen oxides stored in advance.
Further, in order to determine the accuracy of the NOx sensor more accurately, an aging factor of the SCR may be considered, and since the aging factor of the SCR includes an SCR hydrothermal aging factor, a sulfur poisoning influence factor, and the like, the aging factor of the SCR may be defined as an aging factor of the SCR = the SCR hydrothermal aging factor × the sulfur poisoning influence factor, and after the aging factor of the SCR is considered, a corrected reference concentration value = an engine aging factor × a reference concentration value of nitrogen oxides stored in advance × the aging factor of the SCR.
In addition, increasing the urea injection amount may cause the NOx sensor to detect nitrogen oxidesThe first concentration value of the object becomes small, and then the first difference value between the first concentration value and the corrected reference concentration value becomes small. For example, assume that the first concentration value of NOx detected by the NOx sensor before the urea injection amount is not adjusted is 105mg/m 3 The corrected reference concentration value is 100mg/m 3 Then the first difference is 5mg/m 3 After the urea injection quantity is increased, the first concentration value of the NOx sensor for detecting the nitrogen oxides is 103mg/m 3 When the first difference is 3mg/m 3 。
S103, if the first difference value between the first concentration value and the corrected reference concentration value is not larger than a first preset threshold value, determining that the accuracy of the NOx sensor meets a first accuracy value.
Here, the specific value of the first preset threshold is not limited in the present application, and may be adjusted according to actual situations.
For more accurate determination of the accuracy of the NOx sensor, the step of detecting the first concentration value of nitrogen oxides by the NOx sensor may be re-executed after reducing the current urea injection quantity, wherein the magnitude of reducing the urea injection quantity is smaller than the magnitude of increasing the urea injection quantity; and if the first difference value between the first concentration value and the corrected reference concentration value is not larger than a first preset threshold value, determining that the accuracy of the NOx sensor meets a second accuracy value, wherein the first accuracy value is larger than the second accuracy value.
Since a decrease in the urea injection quantity results in an increase in the first concentration value of nitrogen oxides detected by the NOx sensor, the first difference between the first concentration value and the corrected reference concentration value then increases. Continuing with the above example, assuming that after reducing the urea injection amount, the NOx sensor detects a first concentration value of NOx of 106mg/m 3 When the first difference is 6mg/m 3 . If the first difference is still not greater than the first preset threshold, it is determined that the accuracy of the NOx sensor is smaller than the first accuracy value, that is, the second accuracy value can be satisfied.
By the method and the device, whether the NOx sensor breaks down or not or whether the first concentration value of the nitrogen oxides detected by the NOx sensor is modified or not can be detected.
Referring to fig. 2, a method of detecting the accuracy of a NOx sensor is shown, comprising in particular the steps of:
s201, electrifying an ECU, and enabling an engine to be in a running state;
s202, carrying out dew point detection on the NOx sensor;
s203, detecting a first concentration value of nitrogen oxides through a NOx sensor under the condition that a rotating speed value of an engine and a torque value of the engine are fixed in a specified time period at the current moment;
s204, if a first difference value between the first concentration value and the corrected reference concentration value is larger than a first preset threshold value and not larger than a second preset threshold value, increasing the urea injection quantity and then executing the step S203 again;
the corrected reference concentration value is obtained by correcting a prestored nitrogen oxide reference concentration value based on an engine aging factor and an SCR aging factor, the engine aging factor is determined according to the total running time of the engine, and the SCR aging factor is determined according to factors such as an SCR hydrothermal aging factor and a sulfur poisoning influence factor.
S205, if a first difference value between the first concentration value and the corrected reference concentration value is not larger than a first preset threshold value, determining that the accuracy of the NOx sensor meets a first accuracy value;
s206, if a first difference value between the first concentration value and the corrected reference concentration value is larger than a second preset threshold value, determining that the accuracy of the NOx sensor does not meet a first accuracy value;
s207, after a first difference value between the first concentration value and the corrected reference concentration value is not larger than a first preset threshold value, reducing the current urea injection quantity and then executing the step S203 again, wherein the amplitude of reducing the urea injection quantity is smaller than the amplitude of increasing the urea injection quantity;
s208, if the first difference value between the first concentration value and the corrected reference concentration value is greater than a first preset threshold value and not greater than a second preset threshold value, increasing the urea injection amount again and then executing the step S203 again;
here, the magnitude of the increase in the urea injection amount again is smaller than the magnitude of the increase in the urea injection amount in the previous time.
S209, if the first difference between the first concentration value and the corrected reference concentration value is not larger than a first preset threshold value, determining that the accuracy of the NOx sensor meets a second accuracy value, wherein the first accuracy value is larger than the second accuracy value.
Referring to fig. 3, an embodiment of the present application provides an apparatus 300 for detecting accuracy of a NOx sensor, the apparatus including:
a detection module 301, configured to detect a first concentration value of nitrogen oxides by a NOx sensor;
a comparing module 302, configured to, if a first difference between the first concentration value and the corrected reference concentration value is greater than a first preset threshold and not greater than a second preset threshold, increase an injection amount of urea and then perform the step of detecting the first concentration value of nitrogen oxides by the NOx sensor again; the corrected reference concentration value is obtained by correcting a prestored reference concentration value of nitrogen oxides based on an engine aging factor, and the engine aging factor is determined according to the total running time of the engine;
a determining module 303, configured to determine that the accuracy of the NOx sensor meets a first accuracy value if a first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold.
Optionally, after determining that the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, the determining module 303 is further configured to:
re-executing the step of detecting the first concentration value of nitrogen oxides by the NOx sensor after reducing the current urea injection quantity, wherein the magnitude of reducing the urea injection quantity is smaller than the magnitude of increasing the urea injection quantity;
and if a first difference value between the first concentration value and the corrected reference concentration value is not larger than the first preset threshold value, determining that the accuracy of the NOx sensor meets a second accuracy value, wherein the first accuracy value is larger than the second accuracy value.
Optionally, before detecting the first concentration value of the nitrogen oxide by the NOx sensor, the detecting module 301 is further configured to:
it is determined that a rotational speed value of an engine and a torque value of the engine are fixed for a specified period of time at a present time.
Optionally, the corrected reference concentration value is determined by:
determining the engine aging factor based on the total running time of the engine at the current moment and a first specified aging coefficient;
determining a product of the pre-stored reference concentration value of NOx and the engine aging factor as the corrected reference concentration value.
Optionally, before detecting the first concentration value of the nitrogen oxide by the NOx sensor, the detecting module 301 is further configured to:
determining that the dew point temperature value of the NOx sensor is within a specified temperature value range.
Having described the method and apparatus for detecting the accuracy of a NOx sensor according to an exemplary embodiment of the present application, an electronic device according to another exemplary embodiment of the present application will be described next.
As will be appreciated by one skilled in the art, aspects of the present application may be embodied as a system, method or program product. Accordingly, various aspects of the present application may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system.
In some possible implementations, an electronic device according to the present application may include at least one processor, and at least one memory. Wherein the memory stores program code which, when executed by the processor, causes the processor to perform the steps of the method of detecting the accuracy of a NOx sensor according to various exemplary embodiments of the present application described above in the present specification. For example, the processor may perform steps in a method such as detecting the accuracy of a NOx sensor.
The electronic device 120 according to this embodiment of the present application is described below with reference to fig. 4. The electronic device 120 shown in fig. 4 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.
As shown in fig. 4, the electronic device 120 is represented in the form of a general electronic device. The components of the electronic device 120 may include, but are not limited to: the at least one processor 121, the at least one memory 122, and a bus 123 that couples various system components including the memory 122 and the processor 121.
The memory 122 may include readable media in the form of volatile memory, such as Random Access Memory (RAM) 1221 and/or cache memory 1222, and may further include Read Only Memory (ROM) 1223.
Memory 122 may also include a program/utility 1225 having a set (at least one) of program modules 1224, such program modules 1224 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination thereof may comprise an implementation of a network environment.
The electronic device 120 may also communicate with one or more external devices 124 (e.g., keyboard, pointing device, etc.), with one or more devices that enable a user to interact with the electronic device 120, and/or with any device (e.g., router, modem, etc.) that enables the electronic device 120 to communicate with one or more other electronic devices. Such communication may be through input/output (I/O) interfaces 125. Also, the electronic device 120 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet) via the network adapter 126. As shown, the network adapter 126 communicates with other modules for the electronic device 120 over the bus 123. It should be understood that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the electronic device 120, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
In an exemplary embodiment, a computer-readable storage medium comprising instructions, such as memory 122 comprising instructions, executable by processor 121 to perform the above-described method is also provided. Alternatively, the computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
In an exemplary embodiment, a computer program product is also provided, comprising computer programs/instructions which when executed by the processor 121 implement any of the methods of detecting the accuracy of a NOx sensor as provided herein.
In exemplary embodiments, aspects of a method of detecting the accuracy of a NOx sensor provided herein may also be embodied in the form of a program product comprising program code for causing a computer device to perform the steps of a method of detecting the accuracy of a NOx sensor according to various exemplary embodiments of the present disclosure described above in this specification when the program product is run on a computer device.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The program product for detecting the accuracy of a NOx sensor of embodiments of the present application may employ a portable compact disc read only memory (CD-ROM) and include program code, and may be executable on an electronic device. However, the program product of the present application is not limited thereto, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A readable signal medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the consumer electronic device, partly on the consumer electronic device, as a stand-alone software package, partly on the consumer electronic device and partly on a remote electronic device, or entirely on the remote electronic device or server. In the case of remote electronic devices, the remote electronic devices may be connected to the consumer electronic device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to external electronic devices (e.g., through the internet using an internet service provider).
It should be noted that although in the above detailed description several units or sub-units of the apparatus are mentioned, such a division is merely exemplary and not mandatory. Indeed, the features and functions of two or more of the units described above may be embodied in one unit, according to embodiments of the application. Conversely, the features and functions of one unit described above may be further divided into embodiments by a plurality of units.
Further, while the operations of the methods of the present application are depicted in the drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable electronic device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable electronic device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable electronic device to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable electronic device to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A method of detecting the accuracy of a NOx sensor, the method comprising:
detecting a first concentration value of nitrogen oxides by a NOx sensor;
if a first difference value between the first concentration value and the corrected reference concentration value is greater than a first preset threshold value and not greater than a second preset threshold value, increasing the urea injection amount and then re-executing the step of detecting the first concentration value of nitrogen oxides through the NOx sensor; the corrected reference concentration value is obtained by correcting a prestored reference concentration value of nitrogen oxides based on an engine aging factor, and the engine aging factor is determined according to the total running time of the engine;
and if a first difference value between the first concentration value and the corrected reference concentration value is not larger than the first preset threshold value, determining that the accuracy of the NOx sensor meets a first accuracy value.
2. The method according to claim 1, characterized in that, after determining that a first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, the method further comprises:
re-executing the step of detecting the first concentration value of nitrogen oxides by the NOx sensor after reducing the current urea injection quantity, wherein the magnitude of reducing the urea injection quantity is smaller than the magnitude of increasing the urea injection quantity;
if a first difference value between the first concentration value and the corrected reference concentration value is not larger than the first preset threshold value, determining that the accuracy of the NOx sensor meets a second accuracy value, wherein the first accuracy value is larger than the second accuracy value.
3. The method of claim 1, wherein prior to the detecting, by the NOx sensor, the first concentration value of nitrogen oxides, the method further comprises:
it is determined that a rotational speed value of an engine and a torque value of the engine are fixed for a specified period of time at a present time.
4. A method according to any one of claims 1 to 3, wherein the corrected reference concentration value is determined by:
determining the engine aging factor based on the total running time of the engine at the current moment and a first specified aging coefficient;
determining a product of the pre-stored reference concentration value of NOx and the engine aging factor as the corrected reference concentration value.
5. The method of claim 1, wherein prior to the detecting, by the NOx sensor, the first concentration value of nitrogen oxides, the method further comprises:
determining that the dew point temperature value of the NOx sensor is within a specified temperature value range.
6. An apparatus for detecting accuracy of a NOx sensor, the apparatus comprising:
the detection module is used for detecting a first concentration value of nitrogen oxide through a NOx sensor;
a comparison module, configured to, if a first difference between the first concentration value and the corrected reference concentration value is greater than a first preset threshold and not greater than a second preset threshold, increase an injection amount of urea and then perform a step of detecting the first concentration value of nitrogen oxides by the NOx sensor again; the corrected reference concentration value is obtained by correcting a prestored reference concentration value of nitrogen oxides based on an engine aging factor, and the engine aging factor is determined according to the total running time of the engine;
a determining module, configured to determine that the accuracy of the NOx sensor satisfies a first accuracy value if a first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold.
7. The apparatus of claim 6, wherein the determining module, after determining that the first difference between the first concentration value and the modified reference concentration value is not greater than the first preset threshold, is further configured to:
re-executing the step of detecting the first concentration value of nitrogen oxides by the NOx sensor after reducing the current urea injection quantity, wherein the magnitude of reducing the urea injection quantity is smaller than the magnitude of increasing the urea injection quantity;
if a first difference value between the first concentration value and the corrected reference concentration value is not larger than the first preset threshold value, determining that the accuracy of the NOx sensor meets a second accuracy value, wherein the first accuracy value is larger than the second accuracy value.
8. The apparatus of claim 6, wherein the detection module, prior to detecting the first concentration value of nitrogen oxides by the NOx sensor, is further to:
determining that the rotating speed value of the engine and the torque value of the engine in the specified time period at the current moment are fixed.
9. The apparatus according to any one of claims 6 to 8, wherein the corrected reference concentration value is determined by:
determining the engine aging factor based on the total running time of the engine at the current moment and a first specified aging coefficient;
determining a product of the pre-stored reference concentration value of NOx and the engine aging factor as the corrected reference concentration value.
10. The apparatus of claim 6, wherein the detection module, prior to detecting the first concentration value of nitrogen oxides by the NOx sensor, is further to:
determining that the dew point temperature value of the NOx sensor is within a specified temperature value range.
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