CN114660171A - Urea concentration detection method, urea concentration detection device, computer equipment and storage medium - Google Patents
Urea concentration detection method, urea concentration detection device, computer equipment and storage medium Download PDFInfo
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Abstract
The application discloses a urea concentration detection method, a urea concentration detection device, computer equipment and a storage medium, wherein the method comprises the following steps: acquiring a first propagation speed of a detection signal of a urea concentration sensor; and when the oscillation degree of the first propagation speed of the detection signal is greater than the preset oscillation degree, latching the detected urea concentration value when oscillation occurs as an effective concentration value. The propagation velocity signal through the detection signal to urea concentration sensor gathers to propagation velocity through the propagation velocity to the detection signal carries out real-time supervision, when monitoring propagation velocity oscillation appearing, can confirm that the urea incasement appears changing, when the oscillation degree is greater than predetermineeing the oscillation degree, probably lead to measuring result serious error, consequently, this application appears obvious oscillation based on the propagation velocity signal, latch concentration value before the oscillation as effective concentration value, can guarantee no matter under what kind of operating mode the vehicle is, especially under crossing or the quiescent condition to the speed of a motor vehicle, guarantee the accuracy of urea concentration.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a method and a device for detecting urea concentration, computer equipment and a storage medium.
Background
In the SCR post-treatment system of the diesel engine, when the exhaust temperature of the diesel engine is higher than a certain value, urea aqueous solution with the concentration of 32.5% is sprayed into the exhaust pipe of the diesel engine through a urea nozzle, urea is hydrolyzed to produce ammonia, and the ammonia and harmful gas NOx in tail gas undergo catalytic reduction reaction to generate N2 and H2O, so that the harm of exhaust pollutants of the diesel engine to the atmospheric environment can be greatly reduced.
The concentration of the urea aqueous solution is measured by a urea concentration sensor, and the phenomenon of inaccurate measurement result often occurs in the practical application process.
Therefore, how to improve the measurement result of the urea concentration becomes an urgent technical problem to be solved.
Disclosure of Invention
The application provides a urea concentration detection method, a urea concentration detection device, computer equipment and a storage medium, which are used for at least solving the technical problem of how to improve the measurement result of the urea concentration in the related art.
According to an aspect of the embodiments of the present application, there is provided a urea concentration detection method applied to a urea concentration sensor, the method including: acquiring a first propagation speed of a detection signal of a urea concentration sensor; and when the oscillation degree of the first propagation speed of the detection signal is greater than the preset oscillation degree, latching the urea concentration detection value when oscillation occurs as an effective concentration value.
Optionally, when the oscillation degree of the propagation speed of the detection signal is greater than a preset oscillation degree, acquiring state information of a urea supply device; confirming whether bubbles are attached to the urea concentration sensor based on the state information; when the urea concentration sensor is attached with bubbles, the method proceeds to a step of latching a urea concentration detection value before occurrence of oscillation as an effective concentration value.
Optionally, the confirming whether the urea concentration sensor adheres to the air bubbles based on the state information includes: judging whether the pressure value of the urea pump is larger than a preset pressure value and/or whether the liquid level of the urea box is lower than a preset liquid level value; and when the pressure value of the urea pump is larger than a preset pressure value and/or the liquid level of the urea box is lower than a preset liquid level value, confirming that bubbles are attached to the urea concentration sensor.
Optionally, the confirming whether the urea concentration sensor adheres to the air bubbles based on the state information includes: acquiring a first temperature value of the urea box in a first state; acquiring a second temperature value of the current urea box; judging whether the temperature difference between the first temperature value and the second temperature value is greater than a preset temperature difference or not; and when the temperature difference is larger than the preset temperature difference, confirming that the urea concentration sensor is attached with bubbles.
Optionally, after the latching, as the effective concentration value, a urea concentration detection value at the time of occurrence of oscillation includes: judging whether the oscillation degree of the propagation speed is weakened to a preset oscillation degree; and when the oscillation degree of the propagation speed is weakened to a preset oscillation degree, taking the currently detected urea concentration value as an effective concentration value.
Optionally, the urea concentration detection method further comprises: when the oscillation degree of the propagation speed of the detection signal is greater than a preset oscillation degree, detecting the duration of the oscillation degree greater than the preset oscillation degree; and when the duration of the oscillation degree which is greater than the preset oscillation degree is greater than the preset duration, latching the urea concentration detection value when oscillation occurs as an effective concentration value.
Optionally, when the oscillation degree is greater than the duration of the preset oscillation degree by a preset duration; filtering the detection signal with oscillation to obtain a second propagation speed of the processed detection signal; obtaining a third propagation velocity of the probe signal within the duration before the time at which oscillation occurs and/or within the duration after the time at which oscillation ends; determining an effective concentration value of urea for the duration based on the second propagation velocity and the third propagation velocity.
In another aspect of the present application, there is provided a urea concentration detection apparatus adapted for use with a urea concentration sensor, the apparatus including: the acquisition module is used for acquiring a first propagation speed of a detection signal of the urea concentration sensor; and the latching module is used for latching the urea concentration detection value when oscillation occurs as an effective concentration value when the oscillation degree of the first propagation speed of the detection signal is greater than a preset oscillation degree.
According to another aspect of the embodiments of the present application, there is provided a computer device, including a processor, a memory, and a program stored on the memory and executable on the processor, wherein the processor executes the program to implement the urea concentration detection method described in any one of the first aspect.
According to another aspect of the present application, there is provided a computer-readable storage medium storing a computer program which, when executed by a processor, implements the urea concentration detection method described in any one of the above first aspects.
In this application embodiment, the propagation velocity signal through the detection signal to urea concentration sensor gathers, and carry out real-time supervision through the propagation velocity to the detection signal, when the oscillation appears in monitoring propagation velocity, can confirm that the urea incasement appears changing, when the oscillation degree is greater than predetermineeing the oscillation degree, when the obvious oscillation appears in the propagation velocity promptly, may lead to the serious error of measuring result, consequently, this application appears obvious oscillation based on the propagation velocity signal, latch concentration value before the oscillation as effective concentration value, can guarantee no matter under what kind of operating mode the vehicle is in, especially under crossing or the quiescent condition to the speed of a motor vehicle, guarantee the accuracy of urea concentration.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic diagram of a hardware environment for a urea concentration detection method according to an embodiment of the invention;
FIG. 2 is a schematic flow diagram of a method for detecting urea concentration according to an embodiment of the present application;
FIG. 3 is a schematic flow diagram of another method for detecting urea concentration according to an embodiment of the present application;
FIG. 4 is a schematic flow diagram of another method for detecting urea concentration according to an embodiment of the present application;
FIG. 5 is a schematic diagram of another urea concentration detection device according to an embodiment of the present application;
FIG. 6 is a block diagram of an alternative computing device according to embodiments of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
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. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As described in the background art, currently, a situation that measurement is inaccurate often occurs when a urea concentration sensor is used for detecting the urea concentration in a urea tank, and for the situation, a method for detecting the urea concentration value based on a vehicle speed exists in the prior art. So as to reduce the fluctuation of the detected value of the concentration of urea caused by the over-fast speed of the vehicle. In the practical application process, the urea aqueous solution in the urea tank is in a flowing state due to the fact that the vehicle speed is too fast, and the measured value of the urea fluctuates. Therefore, the speed of the vehicle is not a direct cause of inaccurate urea detection value in the urea tank, and the inventor finds that the urea concentration measurement value is inaccurate even if the vehicle speed is slow or the vehicle is still under the conditions of temperature change of the urea tank and high pressure of the urea pump.
Based on this, the present application proposes a urea concentration detection method, which can be applied to a hardware environment formed by the terminal 102 and the server 104 as shown in fig. 1. As shown in fig. 1, the server 104 is connected to the terminal 102 through a network, which may be used to provide services for the terminal or a client installed on the terminal, may be provided with a database on the server or independent from the server, may be used to provide data storage services for the server 104, and may also be used to handle cloud services, and the network includes but is not limited to: the terminal 102 is not limited to a PC, a mobile phone, a tablet computer, etc. the terminal may be a wide area network, a metropolitan area network, or a local area network. The urea concentration detection method according to the embodiment of the present application may be executed by the server 104, the terminal 102, or both the server 104 and the terminal 102. The terminal 102 may execute the urea concentration detection method according to the embodiment of the present application by a client installed thereon.
Taking the terminal 102 and/or the server 104 to execute the urea concentration detection method in the embodiment as an example, fig. 2 is a schematic flowchart of an alternative urea concentration detection method according to an embodiment of the present application, and as shown in fig. 2, the flowchart of the method may include the following steps:
s201, acquiring a first propagation speed of a detection signal of a urea concentration sensor. As an exemplary embodiment, a urea concentration sensor generally detects urea concentration by using different propagation speeds of ultrasonic waves in different media, transmits a sound wave signal to a reflecting plate by using an ultrasonic probe on the transmitting plate, reflects the sound wave signal to the ultrasonic probe, calculates the propagation speed of the ultrasonic waves in urea according to a propagation distance and a time difference, and obtains the urea concentration based on corresponding curves of the different propagation speeds and the urea concentration. In the present embodiment, at the time of detection of the urea concentration, the first propagation velocity of the detection signal reflected by the emission plate can be directly acquired. Illustratively, the original ultrasound propagation velocity in a 32.5% urea solution is stable (e.g., 1500 m/s).
Since the propagation speed of the detection signal may change due to temperature change, pressure change of the urea pump, and the like, in this embodiment, the propagation speed of the detection signal may be directly used as the original signal for detecting the urea concentration.
S202, judging whether the oscillation degree of the propagation speed of the detection signal is larger than a preset oscillation degree. As an exemplary embodiment, the propagation speed of the probe signal may be monitored in real time, and when it is monitored that the propagation speed is unstable, that is, the propagation speed of the probe signal oscillates, in this embodiment, the preset oscillation degree may be preset, and for example, the preset oscillation degree may be that the difference between values obtained by multiple sampling exceeds 100m/s, 200m/s, and the like, or the difference between a peak value and a valley value in a propagation speed variation curve of the probe signal exceeds 100m/s, 200m/s, and the like. In this embodiment, if the oscillation degree is detected to be greater than the predetermined oscillation degree, the process proceeds to step S203. When it is detected that the degree of oscillation is smaller than the preset degree of oscillation, the process proceeds to step S204.
S203, latching the detected value of the urea concentration when the oscillation occurs as an effective concentration value. As an exemplary embodiment, when it is detected that the oscillation degree of the propagation velocity of the probe signal is greater than the preset oscillation degree, the first propagation velocity of the historical probe signal may be acquired, the time at which the oscillation occurs may be determined based on a change in the first propagation velocity, and the urea concentration detection value acquired at the time at which the oscillation occurs may be taken as the effective concentration value, or the urea concentration detection value at a time or a time period before the oscillation occurs may be taken as the effective concentration value.
And S204, taking the currently detected urea concentration value as an effective concentration value. As an exemplary embodiment, when the oscillation degree is less than the preset degree, the detected urea concentration value is directly taken as the effective concentration value without changing the current detection state.
In this application, propagation velocity signal through the detection signal to urea concentration sensor gathers, and carry out real-time supervision through the propagation velocity to the detection signal, when the oscillation appears in monitoring propagation velocity, can confirm that the urea incasement appears changing, when the oscillation degree is greater than predetermineeing the oscillation degree, when the obvious oscillation appears in the propagation velocity promptly, can lead to the serious error of measuring result, consequently, this application appears obvious oscillation based on the propagation velocity signal, latch concentration value before the oscillation as effective concentration value, can guarantee no matter under what kind of operating mode the vehicle is in, especially under crossing or the quiescent condition to the speed of a motor vehicle, guarantee the accuracy of urea concentration.
As an exemplary embodiment, there may be various reasons for the oscillation of the propagation speed of the detection signal, for example, a steam pocket occurs in the aqueous solution when the vehicle speed is too high, or the aqueous solution is shaken when the vehicle speed is fast, or the vehicle speed is fast accelerated or fast decelerated, etc., so that the distribution of the propagation medium of the detection signal fluctuates, and further, the propagation speed of the detection signal oscillates.
In this embodiment, the water solution sloshing and the like occur when the vehicle speed is too fast, or when the vehicle speed is rapidly accelerated or rapidly decelerated, the duration is short (only when the vehicle speed is too fast, or when the vehicle speed is rapidly accelerated or rapidly decelerated), and the oscillation is not uniform. Therefore, the problem of detection inaccuracy under all conditions cannot be solved based on detecting the concentration value before latching when the vehicle speed is too fast, in the present embodiment, when bubbles adhere to the concentration sensor, the detected value of the concentration may not match the actual value, and, due to the attachment of the air bubbles, the propagation speed can generate large and stable fluctuation, and the impression of factors such as the speed of the vehicle, the acceleration and the like is not taken, inaccurate detection occurs both when the vehicle is stationary and at a lower speed, for which, when the oscillation degree of the first propagation speed of the detection signal is greater than a preset oscillation degree, the state information of the urea supply device may be acquired, whether bubbles are attached to the urea concentration sensor may be confirmed based on the state information, when it is confirmed that the air bubbles are adhered, the process proceeds to a step of latching the detected urea concentration value before occurrence of the hunting as an effective concentration value. Therefore, in this embodiment, it is possible to confirm whether or not the urea concentration sensor has bubbles based on the state information of the urea supply device, and further confirm whether or not the cause of the concentration detection inaccuracy or the oscillation of the propagation speed is caused by the bubble adhesion, and it is possible to eliminate the problem of the oscillation caused by other causes, further more accurately determine the effective value of the concentration, and further, it is possible to remove the bubbles by a targeted implementation strategy, and it is possible to ensure the accuracy of the concentration value detection.
As an optional embodiment, in the practical application process, a large amount of bubbles occur in the urea box due to temperature change of the urea box, backflow of urea splashes into the urea box and the like, and the urea concentration measurement is inaccurate due to the surface of the urea concentration sensor to which the bubbles are attached. As an exemplary embodiment, as shown in fig. 3, the step of determining that the bubble is attached may include:
s301, obtaining a pressure value of a urea pump and a liquid level value of a urea box. As an exemplary embodiment, for the acquisition of the pressure value of the urea pump, the pressure value detected by the urea pump pressure detection device may be directly acquired, and for the urea tank level value, the pressure value may be acquired based on the level sensor.
S302, judging whether the pressure value of the urea pump is larger than a preset pressure value and/or whether the liquid level of the urea box is lower than a liquid level value. As an exemplary embodiment, the urea pump may release urea to flow back to the urea tank when the pressure of the urea pump is too high, and the urea flowing back may cause a large amount of air bubbles to appear in the urea tank and adhere to the surface of the urea concentration sensor if the level value of the urea tank is low. Therefore, step S303 is performed when the pressure value of the urea pump is greater than the preset pressure value and/or the liquid level of the urea tank is lower than the liquid level value. And when the pressure value of the urea pump is smaller than the preset pressure value and/or the liquid level of the urea tank is higher than the preset liquid level value, the step S304 is executed.
S303, confirming that bubbles are attached to the urea concentration sensor.
S304, confirming that no bubble is attached to the urea concentration sensor.
As another alternative, as shown in fig. 4, the step of judging the attached bubble may include:
s401, obtaining a first temperature value of the urea box in a first state.
S402, obtaining a second temperature value of the current urea box. As an exemplary embodiment, the first state may be a state in which the vehicle is not started. The state of the vehicle may be any state, such as an idle state, a gear state, etc. In this embodiment, a non-activated state or a state at the time of activation can be described as an example. At engine start-up, a first temperature value of an aqueous urea solution in a urea tank at start-up is obtained. When the oscillation degree of the first propagation speed of the detection signal is larger than the preset oscillation degree, the second temperature value of the water solution in the current urea box can be obtained. And making a difference between the first temperature value and the second temperature value to obtain a temperature difference, for example, as the temperature of the aqueous solution of urea rises, bubbles may be separated from the aqueous solution and attached to the surface of the sensor, and especially when the temperature rises greatly, more bubbles are separated from the aqueous solution and attached to the surface of the sensor.
S403, judging whether the temperature difference between the first temperature value and the second temperature value is larger than a preset temperature difference. When the temperature difference is greater than the preset temperature difference, the process proceeds to step S404. When the temperature difference is smaller than the preset temperature difference, the process proceeds to step S405.
S404, confirming that bubbles are attached to the urea concentration sensor.
S405, confirming that no bubble is attached to the urea concentration sensor.
As an exemplary embodiment, after the latching the detected urea concentration value when oscillation occurs as an effective concentration value, monitoring a first propagation speed of a detection signal of a urea concentration sensor in real time, and judging whether the oscillation degree of the propagation speed is reduced to a preset oscillation degree; and when the oscillation degree of the propagation speed is weakened to a preset oscillation degree, taking the currently detected urea concentration value as an effective concentration value. Illustratively, when the oscillation of the propagation velocity signal is weakened (the amplitude is lower than a certain range), the signal is subjected to filtering processing, a urea concentration value is obtained according to the propagation velocity after filtering, and the value is taken as a current concentration effective value.
As an exemplary embodiment, in order to prevent interference of other signals, or a sensor detection error, in this embodiment, when the oscillation degree of the propagation speed of the probe signal is greater than a preset oscillation degree, a duration in which the oscillation degree is greater than the preset oscillation degree is detected. And when the duration of the oscillation degree which is greater than the preset oscillation degree is greater than the preset duration, latching the urea concentration detection value when oscillation occurs as an effective concentration value. As an exemplary embodiment, the duration may be preset, for example, 1s/2s/3s, etc., and is not limited in this embodiment. In this embodiment, if the duration of the oscillation degree greater than the preset oscillation degree is less than the preset duration, it is characterized that the current oscillation is not caused by bubbles attached to the sensor, and may be noise caused by other interference.
As another alternative, when the oscillation degree exceeds the preset oscillation degree, a short-time oscillation may occur due to the addition of a new urea aqueous solution in the urea tank or the occurrence of a sloshing of the urea aqueous solution due to the vehicle speed. Therefore, in order to detect the urea concentration value more accurately, in this embodiment, the second propagation velocity of the processed detection signal is obtained based on filtering the detection signal in which oscillation occurs; obtaining a third propagation velocity of the probe signal within the duration from the time when oscillation occurs or within the duration from the time when oscillation ends; determining an effective concentration value of urea for the duration based on the second propagation velocity and the third propagation velocity.
As an exemplary embodiment, the filtering process within the period of occurrence of oscillation results in a urea concentration value within the period of oscillation, and the average urea concentration value may be determined based on the propagation velocity before and/or after the occurrence of oscillation.
It should be noted that for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts, but those skilled in the art should understand that the present application is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (e.g., a ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, an optical disk) and includes several instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the methods according to the embodiments of the present application.
According to still another aspect of the embodiments of the present application, as shown in fig. 5, there is also provided a urea concentration detection apparatus adapted to a urea concentration sensor, the apparatus including:
an obtaining module 501, configured to obtain a first propagation speed of a detection signal of a urea concentration sensor;
a latch module 502, configured to latch, when the oscillation degree of the first propagation velocity of the detection signal is greater than a preset oscillation degree, a urea concentration detection value at the time of oscillation as an effective concentration value
According to another aspect of the embodiments of the present application, there is also provided an electronic device for implementing the urea concentration detection method, where the electronic device may be a server, a terminal, or a combination thereof.
Fig. 6 is a block diagram of an alternative electronic device according to an embodiment of the present invention, as shown in fig. 6, including a processor 602, a communication interface 604, a memory 606, and a communication bus 608, where the processor 602, the communication interface 604, and the memory 606 communicate with each other through the communication bus 608, where,
a memory 606 for storing computer programs;
the processor 602, when executing the computer program stored in the memory 606, implements the following steps:
acquiring a first propagation speed of a detection signal of a urea concentration sensor;
and when the oscillation degree of the first propagation speed of the detection signal is greater than the preset oscillation degree, latching the urea concentration detection value when oscillation occurs as an effective concentration value.
Alternatively, in this embodiment, the communication bus may be a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 6, but this is not intended to represent only one bus or type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The memory may include RAM, and may also include non-volatile memory (non-volatile memory), such as at least one disk memory. Alternatively, the memory may be at least one memory device located remotely from the processor.
The processor may be a general-purpose processor, and may include but is not limited to: a CPU (Central Processing Unit), an NP (Network Processor), and the like; but also a DSP (Digital Signal Processing), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment is not described herein again.
It can be understood by those skilled in the art that the structure shown in fig. 6 is only an illustration, and the device implementing the method for detecting urea concentration may be a terminal device, and the terminal device may be a terminal device such as a smart phone (e.g., an Android phone, an iOS phone, etc.), a tablet computer, a palm computer, a Mobile Internet Device (MID), a PAD, and the like. Fig. 6 is a diagram illustrating a structure of the electronic device. For example, the terminal device may also include more or fewer components (e.g., network interfaces, display devices, etc.) than shown in FIG. 6, or have a different configuration than shown in FIG. 6.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by a program instructing hardware associated with the terminal device, where the program may be stored in a computer-readable storage medium, and the storage medium may include: flash disk, ROM, RAM, magnetic or optical disk, and the like.
According to still another aspect of an embodiment of the present application, there is also provided a storage medium. Alternatively, in the present embodiment, the storage medium described above may be used for program codes for executing the urea concentration detection method.
Optionally, in this embodiment, the storage medium may be located on at least one of a plurality of network devices in a network shown in the above embodiment.
Optionally, in this embodiment, the storage medium is configured to store program code for performing the following steps:
acquiring a first propagation speed of a detection signal of a urea concentration sensor;
and when the oscillation degree of the first propagation speed of the detection signal is greater than the preset oscillation degree, latching the urea concentration detection value when oscillation occurs as an effective concentration value.
Optionally, for a specific example in this embodiment, reference may be made to the example described in the foregoing embodiment, and details of this are not described again in this embodiment.
Optionally, in this embodiment, the storage medium may include but is not limited to: various media capable of storing program codes, such as a U disk, a ROM, a RAM, a removable hard disk, a magnetic disk, or an optical disk.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
The integrated unit in the above embodiments, if implemented in the form of a software functional unit and sold or used as a separate product, may be stored in the above computer-readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or a part of or all or part of the technical solution contributing to the prior art may be embodied in the form of a software product stored in a storage medium, and including instructions for causing one or more computer devices (which may be personal computers, servers, network devices, or the like) to execute all or part of the steps of the method described in the embodiments of the present application.
In the above embodiments of the present application, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed client may be implemented in other manners. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, and may also be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution provided in this embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (10)
1. A urea concentration detection method is applicable to a urea concentration sensor, and comprises the following steps:
acquiring a first propagation speed of a detection signal of a urea concentration sensor;
and when the oscillation degree of the first propagation speed of the detection signal is greater than the preset oscillation degree, latching the urea concentration detection value when oscillation occurs as an effective concentration value.
2. The urea concentration detection method according to claim 1, wherein when the degree of oscillation of the first propagation velocity of the detection signal is larger than a preset degree of oscillation,
acquiring state information of a urea supply device;
confirming whether bubbles are attached to the urea concentration sensor based on the state information;
when the urea concentration sensor is attached with bubbles, the method proceeds to a step of latching a urea concentration detection value before occurrence of oscillation as an effective concentration value.
3. The urea concentration detection method according to claim 2, wherein the urea supply device includes a urea pump and a urea tank; the confirming whether the urea concentration sensor is attached with the bubbles based on the state information includes:
judging whether the pressure value of the urea pump is larger than a preset pressure value and/or whether the liquid level value of the urea box is lower than a preset liquid level value;
and when the pressure value of the urea pump is larger than a preset pressure value and/or the liquid level value of the urea box is lower than a preset liquid level value, confirming that bubbles are attached to the urea concentration sensor.
4. The urea concentration detection method according to claim 2 or 3, wherein the confirming whether the urea concentration sensor has bubbles adhering thereto based on the state information includes:
acquiring a first temperature value of a urea box in a first state;
acquiring a second temperature value of the current urea box;
judging whether the temperature difference between the first temperature value and the second temperature value is greater than a preset temperature difference or not;
and when the temperature difference is larger than the preset temperature difference, confirming that the urea concentration sensor is attached with bubbles.
5. The urea concentration detection method according to claim 1, comprising, after the latching a detected urea concentration value at which oscillation occurs as an effective concentration value:
judging whether the oscillation degree of the first propagation speed is weakened to the preset oscillation degree or not;
and when the oscillation degree of the first propagation speed is weakened to the preset oscillation degree, taking the currently detected urea concentration value as an effective concentration value.
6. The urea concentration detection method according to claim 1, further comprising:
when the oscillation degree of the first propagation speed of the detection signal is greater than a preset oscillation degree, detecting the duration of the oscillation degree greater than the preset oscillation degree;
and when the duration of the oscillation degree which is greater than the preset oscillation degree is greater than the preset duration, latching the urea concentration detection value when oscillation occurs as an effective concentration value.
7. The urea concentration detection method according to claim 6, wherein when the oscillation degree is larger than the duration of the preset oscillation degree by a preset duration;
filtering the detection signal with oscillation to obtain a second propagation speed of the processed detection signal;
obtaining a third propagation velocity of the probe signal within the duration before the time at which oscillation occurs and/or within the duration after the time at which oscillation ends;
determining an effective concentration value of urea for the duration based on the second propagation velocity and the third propagation velocity.
8. A urea concentration detection apparatus adapted to a urea concentration sensor, the apparatus comprising:
the acquisition module is used for acquiring a first propagation speed of a detection signal of the urea concentration sensor;
and the latching module is used for latching the urea concentration detection value when oscillation occurs as an effective concentration value when the oscillation degree of the first propagation speed of the detection signal is greater than the preset oscillation degree.
9. A computer device comprising a processor, a memory, and a program stored on the memory and executable on the processor, wherein the processor executes the program to implement at least the urea concentration detection method of any one of claims 1 to 7.
10. A computer-readable storage medium storing a computer program, wherein the computer program is executed by a processor to implement the urea concentration detection method according to any one of claims 1 to 7.
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| CN202210264216.3A CN114660171A (en) | 2022-03-17 | 2022-03-17 | Urea concentration detection method, urea concentration detection device, computer equipment and storage medium |
| PCT/CN2023/075844 WO2023173980A1 (en) | 2022-03-17 | 2023-02-14 | Urea concentration measurement method and apparatus, and computer device and storage medium |
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