CN116429880A - Urea concentration detection method, device, electronic equipment and storage medium - Google Patents
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Abstract
The invention also provides a urea concentration detection method, a device, electronic equipment and a storage medium, wherein the method comprises the following steps: acquiring urea data points, wherein the urea data points comprise temperature data, ultrasonic propagation speed data and concentration data of a sample urea solution; performing discrete Fourier transform on the urea data points to obtain discrete Fourier series corresponding to the temperature data and the ultrasonic propagation speed and discrete Fourier expression corresponding to the temperature data and the concentration data; based on the discrete Fourier series and the discrete Fourier expression, constructing a relational expression between urea concentration, temperature and ultrasonic wave propagation speed corresponding to the sample uremic solution; and detecting the urea concentration of the target urea solution based on the relational expression. The method and the device can solve the technical problem that in the prior art, when the vehicle-mounted urea concentration data is calculated, a plurality of factors cannot be considered at the same time, so that the vehicle-mounted urea concentration error is large.
Description
Technical Field
The invention relates to the technical field of automobile electronics, in particular to a urea concentration detection method and device, electronic equipment and a storage medium.
Background
At present, in order to reduce harmful nitrogen oxides generated in the operation of an automobile engine taking diesel oil as an energy source, urea is used for catalyzing and reducing harmful gases, and an ultrasonic method is generally used for measuring the concentration of urea solution in a urea box.
Generally, the ultrasonic method for measuring the concentration of the urea solution mainly depends on judging the propagation speed of ultrasonic waves in the solution to judge the concentration of the urea solution, however, the propagation speed of the ultrasonic waves is also influenced by the temperature of the solution, and meanwhile, a urea concentration sensor can generate larger deviation data due to the influences of bubbles, reflection and the like, which influences the judgment of a microprocessor on the concentration of the urea solution. The current common usage of urea solution concentration measurement is a table look-up method, namely, discrete sound velocity data points are simply processed and then directly correspond to the existing concentration, and the method can only roughly judge the concentration of urea in a urea box and occupies a large memory of a microprocessor. At present, a method for accurately calculating the vehicle-mounted urea concentration data by considering multiple factors at the same time does not exist, so that the error of the vehicle-mounted urea concentration calculated by the prior art scheme is larger.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a urea concentration detection method, apparatus, electronic device and storage medium, so as to solve the technical problem that in the prior art, when calculating vehicle-mounted urea concentration data, multiple factors cannot be considered at the same time, and thus the vehicle-mounted urea concentration error is large.
In order to achieve the above object, the present invention provides a urea concentration detection method comprising:
acquiring urea data points, wherein the urea data points comprise temperature data, ultrasonic propagation speed data and concentration data of a sample urea solution;
performing discrete Fourier transform on the urea data points to obtain discrete Fourier series corresponding to the temperature data and the ultrasonic propagation speed and discrete Fourier expression corresponding to the temperature data and the concentration data;
based on the discrete Fourier series and the discrete Fourier expression, constructing a relational expression between urea concentration, temperature and ultrasonic wave propagation speed corresponding to the sample uremic solution;
and detecting the urea concentration of the target urea solution based on the relational expression.
Further, the urea concentration detection for the target urea solution based on the relational expression comprises:
obtaining the measured temperature and the ultrasonic wave propagation speed corresponding to the target urea solution, and substituting the measured temperature and the ultrasonic wave propagation speed corresponding to the target urea solution into the relational expression to obtain the urea concentration of the target urea solution.
Further, performing a discrete fourier transform on the urea data points to obtain a discrete fourier series corresponding to the temperature data and the ultrasonic propagation velocity, and a discrete fourier expression corresponding to the temperature data and the concentration data, including:
constructing a first relation curve corresponding to the temperature data and the ultrasonic wave propagation speed data based on the urea data points, and constructing a second relation curve corresponding to the temperature data and the concentration data;
performing discrete Fourier transform on the first relation curve to obtain a discrete Fourier series corresponding to the temperature data and the ultrasonic wave propagation speed;
and performing discrete Fourier transform on the second relation curve to obtain a discrete Fourier expression corresponding to the temperature data and the concentration data.
Further, performing discrete fourier transform on the first relation, where the discrete fourier expression is:
wherein ,Nis the number of samples to be processed,kis a function of the temperature data of the temperature,
is the temperature numberAccording to the discrete Fourier series corresponding to the ultrasonic wave propagation speed, < >>
Representing the first relationship.
Further, the expression of the first relation is:
further, performing discrete fourier transform on the second relation, where the discrete fourier expression is:
wherein ,Nis the number of samples to be processed,kis a function of the temperature data of the temperature,
is a discrete Fourier series of the temperature data and the concentration data, and is +.>
Representing the second relationship.
The invention also provides a urea concentration detection device, comprising:
the acquisition module is used for acquiring urea data points, wherein the urea data points comprise temperature data, ultrasonic propagation speed data and concentration data of a sample urea solution;
the transformation module is used for performing discrete Fourier transformation on the urea data points to obtain discrete Fourier series corresponding to the temperature data and the ultrasonic propagation speed and a discrete Fourier expression corresponding to the temperature data and the concentration data;
the construction module is used for constructing a relational expression between urea concentration, temperature and ultrasonic wave propagation speed corresponding to the sample urea solution based on the discrete Fourier series and the discrete Fourier expression;
and the detection module is used for detecting the concentration of urea in the target urea solution based on the relational expression.
Further, the detection module is configured to obtain an actual measurement temperature and an ultrasonic propagation speed corresponding to the target urea solution, and substitute the actual measurement temperature and the ultrasonic propagation speed corresponding to the target urea solution into the relational expression to obtain the urea concentration of the target urea solution.
The invention also provides an electronic device comprising a memory and a processor, wherein,
the memory is used for storing programs;
the processor is coupled to the memory and is configured to execute the program stored in the memory, so as to implement the steps in the urea concentration detection method according to any one of the above.
The invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the urea concentration detection method of any of the above.
The beneficial effects of the implementation mode are that: according to the urea concentration detection method, the device, the electronic equipment and the storage medium, the temperature data, the ultrasonic wave propagation speed data and the concentration data of the sample urea solution are obtained, discrete Fourier transformation is carried out on the data to obtain the discrete Fourier series corresponding to the temperature data and the ultrasonic wave propagation speed and the discrete Fourier expression corresponding to the temperature data and the concentration data, the concentration data and the ultrasonic wave propagation speed are connected through the temperature data to obtain the relational expression corresponding to the urea concentration, the temperature and the ultrasonic wave propagation speed of the sample urea solution, and when the target urea solution concentration is calculated later, the urea concentration can be determined according to the parameters such as the temperature and the ultrasonic wave propagation speed of the solution, and meanwhile, various factors are considered, so that the calculation error of the vehicle-mounted urea concentration is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an embodiment of a urea concentration detection method according to the present invention;
FIG. 2 is a schematic diagram showing the relationship between the ultrasonic propagation velocity and the solution temperature in urea solution provided by the invention;
FIG. 3 is a schematic block diagram of an embodiment of a urea concentration detection apparatus provided by the present invention;
fig. 4 is a schematic structural diagram of an embodiment of an electronic device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or modules is not necessarily limited to those steps or modules that are expressly listed or inherent to such process, method, article, or device.
The naming or numbering of the steps in the embodiments of the present invention does not mean that the steps in the method flow must be executed according to the time/logic sequence indicated by the naming or numbering, and the named or numbered flow steps may change the execution order according to the technical purpose to be achieved, so long as the same or similar technical effects can be achieved.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The invention provides a urea concentration detection method, a urea concentration detection device, electronic equipment and a storage medium, and the urea concentration detection method, the urea concentration detection device, the electronic equipment and the storage medium are respectively described below.
As shown in fig. 1, the present invention provides a urea concentration detection method, comprising:
It will be appreciated that the urea data points in this embodiment include multiple sets of urea data corresponding to the urea tank of a diesel vehicle, each set of urea data including the temperature of the urea solution in the urea tank, the speed of propagation of the ultrasonic waves, and the concentration of urea.
The urea concentration detection method provided by the invention can be executed by a microprocessor on a diesel automobile. The urea box is internally provided with a temperature sensor, a urea concentration detection sensor and an ultrasonic sensor, and data acquired by the sensors can be transmitted to the microprocessor through an automobile bus. The ultrasonic sensor can transmit and receive ultrasonic waves, and the ultrasonic data transmitted and received are transmitted to the microprocessor through the bus.
And 120, performing discrete Fourier transform on the urea data points to obtain a discrete Fourier series corresponding to the temperature data and the ultrasonic propagation speed and a discrete Fourier expression corresponding to the temperature data and the concentration data.
It is understood that urea data points are data collected at different times, i.e., time domain samples, which are converted to discrete forms in the frequency domain by discrete fourier transforms.
And 130, constructing a relational expression between urea concentration, temperature and ultrasonic wave propagation speed corresponding to the sample urea solution based on the discrete Fourier series and the discrete Fourier expression.
It will be appreciated that based on the discrete fourier series of the temperature data corresponding to the ultrasonic propagation velocity, a coefficient of ultrasonic propagation velocity versus urea solution temperature may be obtained, which may be used to describe the magnitude of each stage of component coefficients of ultrasonic sound velocity at different temperatures. After the coefficient is obtained, substituting the coefficient into a discrete Fourier expression corresponding to the temperature data and the concentration data, and obtaining a reasonable relational expression among urea solution temperature, urea concentration and ultrasonic propagation speed.
And 140, detecting the urea concentration of the target urea solution based on the relational expression.
It can be understood that the measured temperature of the target urea solution and/or the ultrasonic propagation speed in the target urea solution are obtained and substituted into the above relational expression to obtain the urea concentration detection result of the target urea solution.
In some embodiments, the detecting urea concentration of the target urea solution based on the relational expression comprises:
obtaining the measured temperature and the ultrasonic wave propagation speed corresponding to the target urea solution, and substituting the measured temperature and the ultrasonic wave propagation speed corresponding to the target urea solution into the relational expression to obtain the urea concentration of the target urea solution.
It can be understood that the target urea solution is the solution in the urea box of the target diesel vehicle, the data such as the measured temperature and the ultrasonic wave propagation speed can be acquired through the sensor on the urea box, and the data is uploaded to the microprocessor through the bus, and the microprocessor processes the data and calculates the urea concentration.
In some embodiments, performing a discrete fourier transform on the urea data points to obtain a discrete fourier series of the temperature data corresponding to the ultrasonic propagation velocity and a discrete fourier expression of the temperature data corresponding to the concentration data includes:
constructing a first relation curve corresponding to the temperature data and the ultrasonic wave propagation speed data based on the urea data points, and constructing a second relation curve corresponding to the temperature data and the concentration data;
performing discrete Fourier transform on the first relation curve to obtain a discrete Fourier series corresponding to the temperature data and the ultrasonic wave propagation speed;
and performing discrete Fourier transform on the second relation curve to obtain a discrete Fourier expression corresponding to the temperature data and the concentration data.
It can be understood that the temperature data, the urea concentration data and the ultrasonic propagation velocity data corresponding to the urea data points are all discrete, and the second relationship curve can be obtained by performing quadratic curve fitting on the plurality of temperature data and the plurality of ultrasonic propagation velocity data, and the second relationship curve can be obtained by performing quadratic curve fitting on the plurality of temperature data and the plurality of concentration data. And obtaining a corresponding discrete Fourier expression and a discrete Fourier series by the discrete Fourier transform method.
In some embodiments, the first relationship is subjected to a discrete fourier transform, and the resulting discrete fourier expression is:
wherein ,Nis the number of samples to be processed,kis a function of the temperature data of the temperature,
is a discrete Fourier series of the temperature data corresponding to the ultrasonic propagation velocity, +.>
Representing the first relationship.
It will be appreciated that the collected urea data points are fourier transformed:
a finite-length urea data point sequence X (n) is set
On which there are N samples, let again
Is a periodic signal with period N created by X (N), and the following formula is:
simplifying the above steps to obtain:
to sum up, X (n) and
the relation of (2) is:
wherein ,
is a time window function.
The same can be deduced for the Discrete Fourier (DFT) expression of the N urea data points:
in some embodiments, the expression of the first relationship is:
it can be understood that substituting the temperature data of the sample urea solution into the discrete fourier expression to obtain a temperature profile expression of the urea solution, namely a first relation curve, wherein the temperature profile describes the relation between the propagation speed of the vehicle-mounted urea solution ultrasonic wave in the solution and the temperature. The amplitude temperature curve is shown in fig. 2.
In some embodiments, the second relationship is subjected to a discrete fourier transform, and the resulting discrete fourier expression is:
wherein ,Nis the number of samples to be processed,kis a function of the temperature data of the temperature,
is a discrete Fourier series of the temperature data and the concentration data, and is +.>
Representing the second relationship.
It will be appreciated that the discrete fourier expressions of the second and first relationships are similar in form and structure, with slightly different parameters in the expressions.
In summary, the urea concentration detection method provided by the invention aims to provide the ultrasonic transmission speed relation coefficient of urea data points at different temperatures after processing a large amount of urea concentration data, calculate the coefficient through discrete Fourier transform to obtain a temperature curve, and describe the relation between the transmission speed of the ultrasonic wave of the vehicle-mounted urea solution in the solution and the temperature.
The method comprises the steps of processing a large number of measured temperature, ultrasonic speed and concentration data, performing discrete Fourier transform on urea solution related data points, and finally obtaining coefficients of ultrasonic propagation speed and temperature according to the transformed discrete Fourier series, wherein the coefficients can be used for describing the coefficient of each level of component of ultrasonic sound velocity at different temperatures. After the coefficient is calculated by the method, the coefficient is substituted into a discrete Fourier transform expansion formula, so that a reasonable temperature-urea concentration formula can be obtained, and a vehicle-mounted microprocessor is helped to read a more accurate urea concentration value.
According to the urea concentration detection method provided by the invention, the temperature data, the ultrasonic propagation speed data and the concentration data of the sample urea solution are obtained, discrete Fourier transform is carried out on the data to obtain the discrete Fourier series corresponding to the temperature data and the ultrasonic propagation speed and the discrete Fourier expression corresponding to the temperature data and the concentration data, the concentration data and the ultrasonic propagation speed are connected through the temperature data to obtain the relational expression between the urea concentration, the temperature and the ultrasonic propagation speed corresponding to the sample urea solution, and when the target urea solution concentration is calculated later, the urea concentration can be determined according to the parameters such as the temperature and the ultrasonic propagation speed of the solution, and meanwhile, various factors are considered, so that the calculation error of the vehicle-mounted urea concentration is reduced.
As shown in fig. 3, the present invention also provides a urea concentration detection apparatus 300, comprising:
an acquisition module 310 for acquiring urea data points including temperature data, ultrasonic propagation velocity data, and concentration data of a sample urea solution;
the transformation module 320 is configured to perform a discrete fourier transformation on the urea data points to obtain a discrete fourier series corresponding to the temperature data and the ultrasonic propagation speed, and a discrete fourier expression corresponding to the temperature data and the concentration data;
a construction module 330, configured to construct a relational expression between the urea concentration, the temperature, and the ultrasonic propagation velocity corresponding to the sample uremic solution based on the discrete fourier series and the discrete fourier expression;
the detection module 340 is configured to detect the urea concentration of the target urea solution based on the relational expression.
In some embodiments, the detection module 340 is configured to obtain the measured temperature and the ultrasonic propagation speed corresponding to the target urea solution, and substitute the measured temperature and the ultrasonic propagation speed corresponding to the target urea solution into the relational expression, so as to obtain the urea concentration of the target urea solution.
The urea concentration detection device provided in the above embodiment may implement the technical solution described in the above embodiment of the urea concentration detection method, and the specific implementation principle of each module or unit may refer to the corresponding content in the above embodiment of the urea concentration detection method, which is not described herein again.
As shown in fig. 4, the present invention further provides an electronic device 400 accordingly. The electronic device 400 comprises a processor 401, a memory 402 and a display 403. Fig. 4 shows only some of the components of the electronic device 400, but it should be understood that not all of the illustrated components are required to be implemented and that more or fewer components may be implemented instead.
The memory 402 may be an internal storage unit of the electronic device 400 in some embodiments, such as a hard disk or memory of the electronic device 400. The memory 402 may also be an external storage device of the electronic device 400 in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like, which are provided on the electronic device 400.
Further, the memory 402 may also include both internal storage units and external storage devices of the electronic device 400. The memory 402 is used for storing application software and various types of data for installing the electronic device 400.
The processor 401 may in some embodiments be a central processing unit (Central Processing Unit, CPU), microprocessor or other data processing chip for executing program code or processing data stored in the memory 402, such as the urea concentration detection method of the present invention.
The display 403 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch, or the like in some embodiments. The display 403 is used for displaying information at the electronic device 400 and for displaying a visual user interface. The components 401-403 of the electronic device 400 communicate with each other via a system bus.
In some embodiments of the invention, when the processor 401 executes the urea concentration detection program in the memory 402, the following steps may be implemented:
acquiring urea data points, wherein the urea data points comprise temperature data, ultrasonic propagation speed data and concentration data of a sample urea solution;
performing discrete Fourier transform on the urea data points to obtain discrete Fourier series corresponding to the temperature data and the ultrasonic propagation speed and discrete Fourier expression corresponding to the temperature data and the concentration data;
based on the discrete Fourier series and the discrete Fourier expression, constructing a relational expression between urea concentration, temperature and ultrasonic wave propagation speed corresponding to the sample uremic solution;
and detecting the urea concentration of the target urea solution based on the relational expression.
It should be understood that: the processor 401 may in addition to the above functions also realize other functions when executing the urea concentration detection program in the memory 402, see in particular the description of the corresponding method embodiments above.
Further, the type of the electronic device 400 is not particularly limited, and the electronic device 400 may be a mobile phone, a tablet computer, a Personal Digital Assistant (PDA), a wearable device, a laptop computer (laptop), or other portable electronic devices. Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices that carry IOS, android, microsoft or other operating systems. The portable electronic device described above may also be other portable electronic devices, such as a laptop computer (laptop) or the like having a touch-sensitive surface, e.g. a touch panel. It should also be appreciated that in other embodiments of the invention, electronic device 400 may not be a portable electronic device, but rather a desktop computer having a touch-sensitive surface (e.g., a touch panel).
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the urea concentration detection method provided by the above methods, the method comprising:
acquiring urea data points, wherein the urea data points comprise temperature data, ultrasonic propagation speed data and concentration data of a sample urea solution;
performing discrete Fourier transform on the urea data points to obtain discrete Fourier series corresponding to the temperature data and the ultrasonic propagation speed and discrete Fourier expression corresponding to the temperature data and the concentration data;
based on the discrete Fourier series and the discrete Fourier expression, constructing a relational expression between urea concentration, temperature and ultrasonic wave propagation speed corresponding to the sample uremic solution;
and detecting the urea concentration of the target urea solution based on the relational expression.
Those skilled in the art will appreciate that all or part of the flow of the methods of the embodiments described above may be accomplished by way of a computer program that instructs associated hardware, and that the program may be stored in a computer readable storage medium. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The urea concentration detection method, the device, the electronic equipment and the storage medium provided by the invention are described in detail, and specific examples are applied to the principle and the implementation of the invention, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present invention, the present description should not be construed as limiting the present invention.
Claims (10)
1. A urea concentration detection method, characterized by comprising:
acquiring urea data points, wherein the urea data points comprise temperature data, ultrasonic propagation speed data and concentration data of a sample urea solution;
performing discrete Fourier transform on the urea data points to obtain discrete Fourier series corresponding to the temperature data and the ultrasonic propagation speed and discrete Fourier expression corresponding to the temperature data and the concentration data;
based on the discrete Fourier series and the discrete Fourier expression, constructing a relational expression between urea concentration, temperature and ultrasonic wave propagation speed corresponding to the sample uremic solution;
and detecting the urea concentration of the target urea solution based on the relational expression.
2. The urea concentration detection method according to claim 1, characterized in that the urea concentration detection of the target urea solution based on the relational expression comprises:
obtaining the measured temperature and the ultrasonic wave propagation speed corresponding to the target urea solution, and substituting the measured temperature and the ultrasonic wave propagation speed corresponding to the target urea solution into the relational expression to obtain the urea concentration of the target urea solution.
3. The urea concentration detection method according to claim 2, wherein the performing discrete fourier transform on the urea data points to obtain a discrete fourier series of the temperature data corresponding to the ultrasonic propagation velocity, and a discrete fourier expression of the temperature data corresponding to the concentration data, comprises:
constructing a first relation curve corresponding to the temperature data and the ultrasonic wave propagation speed data based on the urea data points, and constructing a second relation curve corresponding to the temperature data and the concentration data;
performing discrete Fourier transform on the first relation curve to obtain a discrete Fourier series corresponding to the temperature data and the ultrasonic wave propagation speed;
and performing discrete Fourier transform on the second relation curve to obtain a discrete Fourier expression corresponding to the temperature data and the concentration data.
4. The urea concentration detection method according to claim 3, wherein the first relation is subjected to discrete fourier transform, and the discrete fourier expression obtained is:
wherein ,Nis the number of samples to be processed,kis a function of the temperature data of the temperature,
is a discrete Fourier series of the temperature data corresponding to the ultrasonic propagation velocity, +.>
Representing the first relationship.
5. The urea concentration detection method according to claim 4, wherein the expression of the first relation is:
6. the urea concentration detection method according to claim 3, wherein the second relation is subjected to discrete fourier transform, and the discrete fourier expression obtained is:
wherein ,Nis the number of samples to be processed,kis a function of the temperature data of the temperature,
is a discrete Fourier series of the temperature data and the concentration data, and is +.>
Representing the second relationship.
7. A urea concentration detection apparatus, characterized by comprising:
the acquisition module is used for acquiring urea data points, wherein the urea data points comprise temperature data, ultrasonic propagation speed data and concentration data of a sample urea solution;
the transformation module is used for performing discrete Fourier transformation on the urea data points to obtain discrete Fourier series corresponding to the temperature data and the ultrasonic propagation speed and a discrete Fourier expression corresponding to the temperature data and the concentration data;
the construction module is used for constructing a relational expression between urea concentration, temperature and ultrasonic wave propagation speed corresponding to the sample urea solution based on the discrete Fourier series and the discrete Fourier expression;
and the detection module is used for detecting the concentration of urea in the target urea solution based on the relational expression.
8. The urea concentration detection apparatus according to claim 7, wherein the detection module is configured to obtain an actual measurement temperature and an ultrasonic propagation speed corresponding to the target urea solution, and substitute the actual measurement temperature and the ultrasonic propagation speed corresponding to the target urea solution into the relational expression, to obtain the urea concentration of the target urea solution.
9. An electronic device comprising a memory and a processor, wherein,
the memory is used for storing programs;
the processor is coupled to the memory for executing the program stored in the memory to implement the steps in the urea concentration detection method according to any one of claims 1 to 6.
10. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the urea concentration detection method according to any one of claims 1 to 6.
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