CN114263520B - Detecting NO x Method and device for sensor precision - Google Patents

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

A method and device for detecting the accuracy of a NOx sensor

technical field

The present application relates to the technical field of data processing, in particular to a method and device for detecting the accuracy of a NOx sensor.

Background technique

With the tightening of vehicle exhaust emission regulations and the reduction of diesel engine emission limits, the requirements for the accuracy of nitrogen oxides NOx sensors in vehicles are getting higher and higher. In the prior art, the Selective Catalytic Reduction (SCR) system, that is, the NOx sensor that comes with the post-treatment system is used to monitor the emission. If the monitored NOx emission exceeds the specified emission requirements, the vehicle diagnostic system will carry out an inspection on the vehicle. Torque is limited and speed is limited, causing the vehicle to fail to operate normally.

At present, the NOx sensor is usually used to collect the instantaneous wet-based concentration of NOx in vehicle exhaust, and obtain the instantaneous exhaust flow in the vehicle, and then obtain the instantaneous NOx emission flow according to the instantaneous wet-based concentration of NOx and the instantaneous exhaust flow, and then collect After the instantaneous torque of the engine and the instantaneous speed of the engine, the instantaneous power is obtained, and finally the concentration of NOx is obtained based on the instantaneous NOx emission flow and the instantaneous power. However, for the inaccurate accuracy of the NOx sensor itself, the resulting NOx concentration is also inaccurate. Therefore, a method for detecting the accuracy of the NOx sensor is needed, which can accurately measure the concentration of nitrogen oxides.

Contents of the invention

Embodiments of the present application provide a method and device for detecting the accuracy of a NOx sensor, so that the NOx sensor can be used to accurately measure the concentration of nitrogen oxides.

In the first aspect, an embodiment of the present application provides a method for detecting the accuracy of a NOx sensor, the method comprising:

detecting a first concentration value of nitrogen oxides by a NOx sensor;

If the first difference between the first concentration value and the corrected reference concentration value is greater than the first preset threshold and not greater than the second preset threshold, increase the urea injection amount and re-execute the NOx sensor detection The step of the first concentration value of nitrogen oxides; wherein, the corrected reference concentration value is obtained after correcting the pre-stored reference concentration value of nitrogen oxides based on the engine aging factor, and the engine aging factor is based on The total duration of engine operation is determined;

If the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, it is determined that the accuracy of the NOx sensor satisfies the first accuracy value.

The present application first determines the engine aging factor in combination with the total time of engine operation, and uses the determined engine aging factor to correct the pre-stored reference concentration value of nitrogen oxides, and then uses the first concentration value of the concentration of nitrogen oxides detected by the NOx sensor to be compared with The first difference between the corrected reference concentration values is compared with the first preset threshold and the second preset threshold, and the accuracy value of the NOx sensor is accurately determined again by changing the urea injection amount, so that the NOx sensor can be used to accurately measure nitrogen oxide concentration.

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 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 amount, wherein the range of reducing the urea injection amount is smaller than the range of increasing the urea injection amount;

If the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, it is determined that the accuracy of the NOx sensor satisfies a second accuracy value, the first accuracy value greater than the second precision value.

On the premise that the accuracy of the NOx sensor is determined to meet the first accuracy value, the application adjusts the urea injection amount again, and if the re-detected first difference is not greater than the first preset threshold value, it is further determined that the accuracy of the NOx sensor meets the second accuracy value, And the first accuracy value is greater than the second accuracy value, so that a more accurate NOx sensor can be used to measure the concentration of nitrogen oxides.

Optionally, before the NOx sensor is used to detect the first concentration value of nitrogen oxides, the method further includes:

It is determined that the rotation speed value of the engine and the torque value of the engine are constant within a specified period of time at the current moment.

In the present application, the NOx sensor can be used to detect the first concentration value of nitrogen oxides more accurately when the engine is in a stable speed and torque state.

Optionally, the corrected reference concentration value is determined in the following manner:

determining the engine aging factor based on the total running time of the engine at the current moment and a first specified aging factor;

The product of the pre-stored reference concentration value of nitrogen oxides and the engine aging factor is determined as the corrected reference concentration value.

This application determines the engine aging factor by considering the impact of the engine running time on the engine, and uses the engine aging factor to correct the reference concentration value of nitrogen oxides stored in advance, so that the corrected reference concentration value can be used to more accurately correlate with NOx The first concentration value of nitrogen oxides detected by the sensor is compared.

Optionally, before the NOx sensor is used to detect the first concentration value of nitrogen oxides, the method further includes:

It is determined that the dew point temperature value of the NOx sensor is within a specified temperature value range.

In the present application, before the NOx sensor is controlled to detect the nitrogen oxide concentration, the NOx sensor can detect the nitrogen oxide concentration more accurately by determining that the dew point temperature value of the NOx sensor is within a specified temperature range.

In the second aspect, an embodiment of the present application provides a device for detecting the accuracy of a NOx sensor, the device comprising:

A detection module, configured to detect the first concentration value of nitrogen oxides through the NOx sensor;

A comparison module, configured to increase the amount of urea injection and re-execute the pass if the first difference between the first concentration value and the corrected reference concentration value is greater than the first preset threshold and not greater than the second preset threshold The step of detecting the first concentration value of nitrogen oxides by the NOx sensor; wherein, the corrected reference concentration value is obtained after correcting the pre-stored reference concentration value of nitrogen oxides based on the engine aging factor, the The engine aging factor is determined based on the total time the engine has been running;

A determining module, configured to determine that the accuracy of the NOx sensor satisfies the first accuracy value if the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold.

Optionally, after the determining module determines that the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, it 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 amount, wherein the range of reducing the urea injection amount is smaller than the range of increasing the urea injection amount;

If the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, it is determined that the accuracy of the NOx sensor satisfies a second accuracy value, the first accuracy value greater than the second precision value.

Optionally, before the detection module detects the first concentration value of nitrogen oxides through the NOx sensor, it is also used for:

It is determined that the rotation speed value of the engine and the torque value of the engine are constant within a specified period of time at the current moment.

Optionally, the corrected reference concentration value is determined in the following manner:

determining the engine aging factor based on the total running time of the engine at the current moment and a first specified aging factor;

The product of the pre-stored reference concentration value of nitrogen oxides and the engine aging factor is determined as the corrected reference concentration value.

Optionally, before the detection module detects the first concentration value of nitrogen oxides through the NOx sensor, it is also used for:

It is determined 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 also provides an electronic device, including:

processor;

memory for storing said processor-executable instructions;

Wherein, the processor is configured to execute the instructions to implement any method as provided in the first aspect of the present application.

In the fourth aspect, an embodiment of the present application also provides a computer-readable storage medium, when the instructions in the computer-readable storage medium are executed by the processor of the electronic device, the electronic device can execute the first method of the present application. Either of the methods provided in the aspect.

In a fifth aspect, an embodiment of the present application provides a computer program product, including a computer program/instruction, and when the computer program/instruction is executed by a processor, any method as provided in the first aspect of the present application is implemented.

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 present disclosure.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the present application. Obviously, the accompanying drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

Fig. 1 is a schematic flow chart of a method for detecting the accuracy of a NOx sensor provided by an embodiment of the present application;

FIG. 2 is a schematic flow diagram of a method for detecting the accuracy of a NOx sensor provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a device for detecting the accuracy of a NOx sensor provided by an embodiment of the present application;

Fig. 4 is a schematic diagram of an electronic device provided by an embodiment of the present application.

Detailed ways

In order to enable ordinary persons in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.

At present, with the tightening of vehicle exhaust emission regulations and the reduction of diesel engine emission limits, the requirements for the accuracy of NOx sensors in vehicles are getting higher and higher. In the prior art, the NOx sensor that comes with the SCR system is used for emission monitoring. If the monitored NOx emission exceeds the specified emission requirements, the vehicle diagnostic system will limit the torque and speed of the vehicle, resulting in the failure of the vehicle to operate normally. Therefore, a The NOx sensor precisely measures the nitrogen oxide concentration.

To this end, this application proposes a method for detecting the accuracy of the NOx sensor, using the first difference between the first concentration value of the nitrogen oxide concentration detected by the NOx sensor and the corrected reference concentration value and the first preset threshold value 1. Comparing with the second preset threshold value, and accurately determining the accuracy value of the NOx sensor again by changing the urea injection amount.

After introducing the design idea of the embodiment of the present application, it will be described in detail below with reference to the drawings and specific implementation methods. Although the embodiments of the present application provide the method operation steps as shown in the following embodiments or drawings, more or less operation steps may be included in the method based on conventional or creative efforts. In the steps where logically there is no necessary causal relationship, the execution order of these steps is not limited to the execution order provided in the embodiment of the present application.

Referring to Figure 1, a method for detecting the accuracy of a NOx sensor is shown, which specifically includes the following steps:

S101. Detect a first concentration value of nitrogen oxides by a NOx sensor.

In an embodiment of the present application, after the electronic control unit (Electronic Control Unit, ECU) in the vehicle is powered on, the engine starts to run. When the engine is running, because the NOx sensor needs to work in a low temperature environment, and when there is water vapor in the NOx sensor, the water vapor condenses into water droplets, causing cracks in the NOx sensor, resulting in damage to the NOx sensor. Therefore, in order to ensure that the NOx sensor can work normally and ensure the accuracy of the first concentration value of nitrogen oxides detected by the NOx sensor, the dew point detection of the NOx sensor can be performed first, for example, to detect that the dew point temperature of the NOx sensor is within a specified temperature range.

After the dew point detection of the NOx sensor is completed, in order to ensure the accuracy of the detection by the NOx sensor, it is also possible to detect nitrogen through the NOx sensor when the engine speed value and the engine torque value are fixed within the specified time period at the current moment. The first concentration value for oxides.

S102, if the first difference between the first concentration value and the corrected reference concentration value is greater than the first preset threshold and not greater than the second preset threshold, increase the urea injection amount and re-execute the detection of nitrogen oxidation by the NOx sensor step of the first concentration value of the substance.

Wherein, the corrected reference concentration value is obtained by correcting the pre-stored reference concentration value of nitrogen oxides based on the engine aging factor, and the engine aging factor is determined according to the total running time of the engine. Determine the corrected reference concentration value by:

Based on the total running time of the engine at the current moment and the first designated aging coefficient, the engine aging factor is determined, and the product of the pre-stored reference concentration value of nitrogen oxides and the engine aging factor is determined as the corrected reference concentration value. That is, the engine aging factor=the current total running time of the engine×the first specified aging coefficient, the corrected reference concentration value=the engine aging factor×the pre-stored reference concentration value of nitrogen oxides.

Further, in order to more accurately determine the accuracy of the NOx sensor, the aging factor of the SCR can also be considered. Since the aging factor of the SCR includes the SCR hydrothermal aging factor and the sulfur poisoning factor, the aging factor of the SCR can be defined as the SCR Aging factor = SCR hydrothermal aging factor × sulfur poisoning factor, and after considering the SCR aging factor, the corrected reference concentration value = engine aging factor × pre-stored reference concentration value of nitrogen oxides × SCR aging factor.

In addition, increasing the injection amount of urea will cause the first concentration value of nitrogen oxides detected by the NOx sensor to become smaller, and then the first difference between the first concentration value and the corrected reference concentration value will become smaller. For example, assuming that before the urea injection amount is adjusted, the first concentration value of nitrogen oxides detected by the NOx sensor is 105 mg/m ³ , and the corrected reference concentration value is 100 mg/m ³ , then the first difference is 5 mg/m ³ , After increasing the urea injection amount, the NOx sensor detects that the first concentration of nitrogen oxides is 103 mg/m ³ , and the first difference is 3 mg/m ³ .

S103. If the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, determine that the accuracy of the NOx sensor satisfies the first accuracy value.

Here, the present application does not limit the specific value of the first preset threshold, which can be adjusted according to actual conditions.

In order to determine the accuracy of the NOx sensor more accurately, the step of detecting the first concentration value of nitrogen oxides through the NOx sensor can be performed again after reducing the current urea injection amount, wherein the magnitude of reducing the urea injection amount is smaller than the magnitude of increasing the urea injection amount; if If the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, it is determined that the accuracy of the NOx sensor meets the second accuracy value, and the first accuracy value is greater than the second accuracy value.

Since reducing the amount of urea injection will cause the first concentration value of nitrogen oxides detected by the NOx sensor to become larger, then the first difference between the first concentration value and the corrected reference concentration value will become larger. Continuing to explain according to the above example, assume that after reducing the urea injection amount, the first concentration value of nitrogen oxides detected by the NOx sensor is 106 mg/m ³ , and the first difference value at this time is 6 mg/m ³ . If the first difference is still not greater than the first preset threshold at this time, 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.

The present application can also detect whether the NOx sensor itself fails or whether the first concentration value of nitrogen oxides detected by the NOx sensor is modified.

Referring to Figure 2, a method for detecting the accuracy of a NOx sensor is shown, which specifically includes the following steps:

S201, the ECU is powered on and the engine is running;

S202, performing dew point detection on the NOx sensor;

S203, under the condition that the rotational speed value of the engine and the torque value of the engine are fixed within the specified time period at the current moment, detect the first concentration value of nitrogen oxides through the NOx sensor;

S204, if the first difference between the first concentration value and the corrected reference concentration value is greater than the first preset threshold and not greater than the second preset threshold, increase the urea injection amount and then re-execute step S203;

Among them, the corrected reference concentration value is obtained after correcting the pre-stored reference concentration value of nitrogen oxides based on the engine aging factor and the SCR aging factor. The engine aging factor is determined according to the total running time of the engine. The aging factor is determined based on factors such as SCR hydrothermal aging factor and sulfur poisoning factor.

S205. If the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, determine that the accuracy of the NOx sensor meets the first accuracy value;

S206. If the first difference between the first concentration value and the corrected reference concentration value is greater than a second preset threshold, determine that the accuracy of the NOx sensor does not meet the first accuracy value;

S207, after the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold value, re-execute step S203 after reducing the current urea injection amount, wherein the magnitude of reducing the urea injection amount is less than the increase Amplitude of urea injection volume;

S208, if the first difference between the first concentration value and the corrected reference concentration value is greater than the first preset threshold and not greater than the second preset threshold, increase the urea injection amount again and execute step S203 again;

Here, the range of increasing the injection amount of urea again is smaller than the range of increasing the injection amount of urea last time.

S209. If the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, determine that the accuracy of the NOx sensor meets the second accuracy value, and the first accuracy value is greater than the second accuracy value.

Referring to FIG. 3 , an embodiment of the present application provides a device 300 for detecting the accuracy of a NOx sensor, which includes:

A detection module 301, configured to detect a first concentration value of nitrogen oxides through a NOx sensor;

A comparison module 302, configured to increase the urea injection amount and execute again if the first difference between the first concentration value and the corrected reference concentration value is greater than the first preset threshold and not greater than the second preset threshold The step of detecting the first concentration value of nitrogen oxides by the NOx sensor; wherein, the corrected reference concentration value is obtained after correcting the pre-stored reference concentration value of nitrogen oxides based on the engine aging factor, so The above-mentioned engine aging factor is determined based on the total time of engine operation;

A determining module 303, configured to determine that the accuracy of the NOx sensor satisfies the first accuracy value if the 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 determination 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 amount, wherein the range of reducing the urea injection amount is smaller than the range of increasing the urea injection amount;

If the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, it is determined that the accuracy of the NOx sensor satisfies a second accuracy value, the first accuracy value greater than the second precision value.

Optionally, before the detection module 301 detects the first concentration value of nitrogen oxides through the NOx sensor, it is also used to:

It is determined that the rotation speed value of the engine and the torque value of the engine are constant within a specified period of time at the current moment.

Optionally, the corrected reference concentration value is determined in the following manner:

determining the engine aging factor based on the total running time of the engine at the current moment and a first specified aging factor;

The product of the pre-stored reference concentration value of nitrogen oxides and the engine aging factor is determined as the corrected reference concentration value.

Optionally, before the detection module 301 detects the first concentration value of nitrogen oxides through the NOx sensor, it is also used to:

It is determined that the dew point temperature value of the NOx sensor is within a specified temperature value range.

After introducing the method and device for detecting the accuracy of a NOx sensor according to the exemplary embodiment of the present application, next, an electronic device according to another exemplary embodiment of the present application is introduced.

Those skilled in the art can understand that various aspects of the present application can be implemented as a system, method or program product. Therefore, various aspects of the present application can be specifically implemented in the following forms, that is: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, which can be collectively referred to herein as "circuit", "module" or "system".

In some possible implementation manners, an electronic device according to the present application may at least include at least one processor and at least one memory. Wherein, the memory stores program codes, and when the program codes are executed by the processor, the processor is made to execute the steps in the method for detecting the accuracy of the NOx sensor according to various exemplary embodiments of the present application described above in this specification. For example, a processor may perform steps in a method such as checking 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 limit the functions and scope of use of this embodiment of the present application.

As shown in FIG. 4, the electronic device 120 is represented in the form of a general electronic device. Components of the electronic device 120 may include, but are not limited to: at least one processor 121 , at least one memory 122 , and a bus 123 connecting different system components (including the memory 122 and the processor 121 ).

Bus 123 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a processor, or a local bus using any of a variety of bus structures.

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 a read only memory (ROM) 1223 .

Memory 122 may also include programs/utilities 1225 having a set (at least one) of program modules 1224 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, which Each or some combination of the examples may include the implementation of a network environment.

Electronic device 120 may also communicate with one or more external devices 124 (e.g., keyboards, pointing devices, etc.), and may also communicate with one or more devices that enable a user to interact with electronic device 120, and/or communicate with one or more devices that enable the electronic device to 120 is capable of communicating with any device (eg, router, modem, etc.) that communicates with one or more other electronic devices. Such communication may occur through input/output (I/O) interface 125 . Moreover, the electronic device 120 can also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN) and/or a public network such as the Internet) through the network adapter 126 . As shown, network adapter 126 communicates with other modules for electronic device 120 over bus 123 . It should be understood that although not shown, other hardware and/or software modules may be used in conjunction with 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 system, etc.

In an exemplary embodiment, there is also provided a computer-readable storage medium including instructions, such as the memory 122 including instructions, which can be executed by the processor 121 to complete the above method. Alternatively, the computer readable storage medium may be ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like.

In an exemplary embodiment, a computer program product is also provided, including computer programs/instructions. When the computer program/instructions are executed by the processor 121, any of the methods for detecting the accuracy of the NOx sensor as provided in this application is implemented.

In an exemplary embodiment, various aspects of a method for detecting the accuracy of a NOx sensor provided in the present application can also be implemented in the form of a program product, which includes program code. When the program product is run on a computer device, the program code The computer equipment is used to execute the steps in a method for detecting the accuracy of a NOx sensor according to various exemplary embodiments of the present application described above in this specification.

A program product may take the form of 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 electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination thereof. More specific examples (non-exhaustive list) of readable storage media include: electrical connections with one or more wires, portable disks, hard disks, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory), optical fiber, portable compact disk read only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

The program product for detecting the accuracy of the NOx sensor according to the embodiment of the present application may adopt a portable compact disk read only memory (CD-ROM) and include program codes, and may be run on an electronic device. However, the program product of the present application is not limited thereto. In this document, a readable storage medium may be any tangible medium containing or storing a program, and the program may be used by or in combination with an instruction execution system, device, or device.

A readable signal medium may include a data signal carrying readable program code in baseband or as part of a carrier wave. Such propagated data signals may take many forms, including - but not limited to - electromagnetic signals, optical signals, or any suitable combination of the foregoing. A readable signal medium may also be any readable medium other than a readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction 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 codes for performing the operations of the present application can be written in any combination of one or more programming languages, including object-oriented programming languages—such as Java, C++, etc., as well as conventional procedural programming Language - such as "C" or similar programming language. The program code may execute entirely on the user's electronic device, partly on the user's device, as a stand-alone software package, partly on the user's electronic device and partly on a remote electronic device, or entirely on the remote electronic device or service Execute on the terminal. In cases involving a remote electronic device, the remote electronic device may be connected to the user electronic device through any kind of network, including a local area network (LAN) or a wide area network (WAN), or it may be connected to an external electronic device (such as by using an Internet service Provider via Internet connection).

It should be noted that although several units or subunits of the apparatus are mentioned in the above detailed description, this division is only exemplary and not mandatory. Actually, according to the embodiment of the present application, the features and functions of two or more units described above may be embodied in one unit. Conversely, the features and functions of one unit described above may be further divided to be embodied by a plurality of units.

In addition, while operations of the methods of the present application are depicted in the figures in a particular order, there is no requirement or implication that these operations must be performed in that particular order, or that all illustrated operations must be performed to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step for execution, and/or one step may be decomposed into multiple steps for execution.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a 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, etc.) 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 present application. It will be understood that each process and/or block in the flowchart illustrations and/or block diagrams, and combinations of processes and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable electronic devices to produce a machine such that the instructions executed by the processor of the computer or other programmable electronic device produce a Means for specifying functions in one or more steps of a flowchart and/or one or more blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable electronic device to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means Realize the function specified in one or more procedures of the flowchart and/or one or more boxes of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable electronic device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device Steps are provided for implementing the functions specified in the flow chart or flow charts and/or block diagram block or blocks.

While the preferred embodiments of the present application have been described, additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of this application.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims (10)

1. A method for detecting the accuracy of a NOx sensor, characterized in that the method comprises: detecting a first concentration value of nitrogen oxides by a NOx sensor; If the first difference between the first concentration value and the corrected reference concentration value is greater than the first preset threshold and not greater than the second preset threshold, increase the urea injection amount and re-execute the NOx sensor detection The step of the first concentration value of nitrogen oxides; wherein, the corrected reference concentration value is obtained after correcting the pre-stored reference concentration value of nitrogen oxides based on the engine aging factor, and the engine aging factor is based on The total duration of engine operation is determined; If the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, it is determined that the accuracy of the NOx sensor satisfies the first accuracy value. 2. The method according to claim 1, wherein 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 value, the Methods also include: Re-executing the step of detecting the first concentration value of nitrogen oxides by the NOx sensor after reducing the current urea injection amount, wherein the range of reducing the urea injection amount is smaller than the range of increasing the urea injection amount; If the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, it is determined that the accuracy of the NOx sensor satisfies a second accuracy value, the first accuracy value greater than the second precision value. 3. The method according to claim 1, characterized in that, before the first concentration value of nitrogen oxides is detected by the NOx sensor, the method further comprises: It is determined that the rotation speed value of the engine and the torque value of the engine are constant within a specified period of time at the current moment. 4. The method according to any one of claims 1 to 3, characterized in that the corrected reference concentration value is determined in the following manner: determining the engine aging factor based on the total running time of the engine at the current moment and a first specified aging factor; The product of the pre-stored reference concentration value of nitrogen oxides and the engine aging factor is determined as the corrected reference concentration value. 5. The method according to claim 1, characterized in that, before the first concentration value of nitrogen oxides is detected by the NOx sensor, the method further comprises: It is determined that the dew point temperature value of the NOx sensor is within a specified temperature value range. 6. A device for detecting the accuracy of a NOx sensor, characterized in that the device comprises: A detection module, configured to detect the first concentration value of nitrogen oxides through the NOx sensor; A comparison module, configured to increase the amount of urea injection and re-execute the pass if the first difference between the first concentration value and the corrected reference concentration value is greater than the first preset threshold and not greater than the second preset threshold The step of detecting the first concentration value of nitrogen oxides by the NOx sensor; wherein, the corrected reference concentration value is obtained after correcting the pre-stored reference concentration value of nitrogen oxides based on the engine aging factor, the The engine aging factor is determined based on the total time the engine has been running; A determining module, configured to determine that the accuracy of the NOx sensor satisfies the first accuracy value if the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold. 7. The device according to claim 6, wherein the determination module determines that the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold Afterwards, also for: Re-executing the step of detecting the first concentration value of nitrogen oxides by the NOx sensor after reducing the current urea injection amount, wherein the range of reducing the urea injection amount is smaller than the range of increasing the urea injection amount; If the first difference between the first concentration value and the corrected reference concentration value is not greater than the first preset threshold, it is determined that the accuracy of the NOx sensor satisfies a second accuracy value, the first accuracy value greater than the second precision value. 8. The device according to claim 6, wherein the detection module is further used for: before detecting the first concentration value of nitrogen oxides by the NOx sensor: It is determined that the rotation speed value of the engine and the torque value of the engine are constant within a specified period of time at the current moment. 9. The device according to any one of claims 6-8, characterized in that the corrected reference concentration value is determined by the following method: determining the engine aging factor based on the total running time of the engine at the current moment and a first specified aging factor; The product of the pre-stored reference concentration value of nitrogen oxides and the engine aging factor is determined as the corrected reference concentration value. 10. The device according to claim 6, wherein the detection module is further used for: before detecting the first concentration value of nitrogen oxides by the NOx sensor: It is determined that the dew point temperature value of the NOx sensor is within a specified temperature value range.

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