CN112782229B - Urea detection method and device - Google Patents
Urea detection method and device Download PDFInfo
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- CN112782229B CN112782229B CN202011552714.5A CN202011552714A CN112782229B CN 112782229 B CN112782229 B CN 112782229B CN 202011552714 A CN202011552714 A CN 202011552714A CN 112782229 B CN112782229 B CN 112782229B
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Abstract
The invention provides a method and a device for detecting urea, comprising the following steps: acquiring urea parameters of a urea solution of a urea box sensor in real time; determining whether the urea tank is in a thawed state based on urea parameters; when the urea box is in a unfreezing state, determining whether the concentration of urea is within a preset concentration range; and when the urea concentration is determined not to be in the preset concentration range, taking the pre-stored urea concentration value as the urea concentration detected by the urea box sensor, and outputting and displaying the urea concentration. According to the scheme, whether the urea box is in a unfreezing state or not is determined through the urea temperature measured by the urea box sensor, when the urea box is determined to be in the unfreezing state, the pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter and is output and displayed by determining whether the urea concentration is within a preset concentration range or not. The interference to the measurement process of the urea box sensor can be reduced, and therefore the phenomenon of misinformation of the urea concentration is reduced.
Description
Technical Field
The invention relates to the technical field of urea detection, in particular to a method and a device for detecting urea.
Background
At present, parameters of urea solution are usually detected through a urea tank sensor in a urea tank so as to monitor the quality of the urea solution, and when the concentration of urea in the urea tank does not reach the standard, faults can be reported through an on-board automatic diagnosis system OBD. Because the floating ice existing in the urea solution can interfere the measurement of the concentration of the urea box sensor in the unfreezing process, the urea concentration detected by the urea box sensor can not reach the standard, and the phenomenon of misinformation of the urea concentration is caused.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for detecting urea, so as to solve the problem of misreporting of urea concentration in the prior art.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the embodiment of the invention discloses a urea detection method applied to a control unit in a urea box, which comprises the following steps:
the method comprises the steps of obtaining urea parameters of a urea solution of a urea box sensor in real time, wherein the urea parameters comprise urea concentration and urea temperature;
determining whether the urea tank is in a thawed state based on the urea parameter;
when the urea box is in a unfreezing state, determining whether the urea concentration is within a preset concentration range;
and when the urea concentration is determined not to be in the preset concentration range, taking the pre-stored urea concentration value as the urea concentration detected by the urea box sensor, and outputting and displaying the urea concentration.
Optionally, the method further includes:
and if the urea concentration is determined to be within a preset concentration range, outputting and displaying the urea concentration.
Optionally, the determining whether the urea tank is in a defrosting state based on the urea parameter includes:
calculating a temperature change rate of the urea based on a current urea temperature and a last urea temperature;
judging whether the urea temperature is in a preset temperature range or not, and whether the temperature change rate is greater than a preset temperature change rate or not;
and if the urea temperature is within a preset temperature range and the temperature change rate is greater than the preset temperature change rate, determining that the urea box is in a unfreezing state.
Optionally, the determining whether the urea concentration is within a preset concentration range includes:
judging whether the urea concentration is greater than a first urea concentration and less than a second urea concentration;
and if the urea concentration is greater than the first urea concentration and less than the second urea concentration, taking the pre-stored urea concentration value as the urea concentration detected by the urea box sensor, and outputting and displaying the urea concentration.
Optionally, the method further includes:
and after determining that the urea concentration is not in the preset concentration range, outputting alarm information.
The embodiment of the invention also discloses a urea detection device, which comprises:
the acquisition unit is used for acquiring urea parameters of a urea solution of a urea box sensor in real time, wherein the urea parameters comprise urea concentration and urea temperature;
a first determination unit configured to determine whether the urea tank is in a thawed state based on the urea parameter;
a second determination unit configured to determine whether the urea concentration is within a preset concentration range when the urea tank is in a thawing state;
and the first output unit is used for taking a pre-stored urea concentration value as the urea concentration detected by the urea box sensor and outputting and displaying the urea concentration when the urea concentration is determined not to be in the preset concentration range.
Optionally, the method further includes:
and the second output unit is used for outputting and displaying the urea concentration when the urea concentration is determined to be in a preset concentration range.
Optionally, the first determining unit is specifically configured to: calculating the temperature change rate of the urea based on the current urea temperature and the urea temperature at the last moment; judging whether the urea temperature is in a preset temperature range or not, and whether the temperature change rate is greater than a preset temperature change rate or not; and if the urea temperature is within a preset temperature range and the temperature change rate is greater than the preset temperature change rate, determining that the urea box is in a unfreezing state.
Optionally, the second determining unit is specifically configured to: judging whether the urea concentration is greater than a first urea concentration and less than a second urea concentration; and if the urea concentration is greater than the first urea concentration and less than the second urea concentration, taking the pre-stored urea concentration value as the urea concentration detected by the urea box sensor, and outputting and displaying the urea concentration.
Optionally, the method further includes:
and the alarm unit is used for outputting alarm information after determining that the urea concentration is not in a preset concentration range.
Based on the detection method and the detection device for urea provided by the embodiment of the invention, the method is applied to a control unit in a urea box, and comprises the following steps: acquiring urea parameters of a urea solution of a urea box sensor in real time, wherein the urea parameters comprise urea concentration and urea temperature; determining whether the urea tank is in a thawed state based on urea parameters; when the urea box is in a unfreezing state, determining whether the concentration of urea is within a preset concentration range; and when the urea concentration is determined not to be in the preset concentration range, taking the pre-stored urea concentration value as the urea concentration detected by the urea box sensor, and outputting and displaying the urea concentration. In the embodiment of the invention, whether the urea box is in a unfreezing state is determined through the urea temperature measured by the urea box sensor, when the urea box is determined to be in the unfreezing state, the pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter and is output and displayed by determining whether the urea concentration is in a preset concentration range or not. The interference to the measurement process of the urea box sensor can be reduced, and therefore the phenomenon of misinformation of the urea concentration is reduced.
Drawings
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, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for detecting urea according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a urea detection device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another urea detection device according to an embodiment of 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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
In the embodiment of the invention, whether the urea box is in a unfreezing state is determined through the urea temperature measured by the urea box sensor, when the urea box is determined to be in the unfreezing state, the pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter and is output and displayed by determining whether the urea concentration is in a preset concentration range or not. The interference to the measurement process of the urea box sensor can be reduced, and therefore the phenomenon of misinformation of the urea concentration is reduced.
In the embodiment of the invention, the urea box is connected with an engine of a vehicle and used for treating exhaust gas of the engine, and a urea box sensor and a control unit are arranged in the urea box; that is, the control unit in the urea tank is connected with the vehicle control unit. The urea box sensor is used for acquiring urea parameters such as temperature and concentration of urea in real time; the control unit is used for processing the urea temperature and concentration acquired by the urea box sensor.
Optionally, a container assembled by other accessory devices and used for storing the urea aqueous solution is also arranged in the urea box.
The urea tank sensor according to the embodiment of the present invention is a hexaurea tank sensor.
Referring to fig. 1, a schematic flow chart of a method for detecting urea according to an embodiment of the present invention is shown, and the method is applied to a control unit in a urea tank, and includes:
step S101: and acquiring urea parameters of a urea solution of a urea box sensor in real time.
It should be noted that the urea parameters include urea concentration and urea temperature.
In the process of implementing step S101 specifically, the urea tank sensor measures the temperature and concentration of urea in real time, and the control unit obtains the urea concentration and urea temperature measured by the urea tank sensor in real time.
The urea tank sensor is a sensor that converts a detected parameter corresponding to urea into a usable output signal.
Step S102: and determining whether the urea box is in a unfreezing state or not based on the urea parameters, if so, executing the steps S103 to S105, and if not, indicating that the urea box sensor has no risk of error report, executing the step S105.
In the process of specifically realizing the step S102, whether the urea box is in the process of unfreezing, namely the unfreezing state, is determined according to the urea temperature; when it is determined that the urea tank is in the process of thawing, it is indicated that floating ice in the urea solution may affect the detection of the concentration of the urea tank sensor, so that the urea tank sensor has a risk of error reporting, and at this time, the urea concentration measured by the urea tank sensor needs to be evaluated and optimized, that is, step S103 to step S105 are executed; when the urea tank is not in the unfreezing state, that is, it is indicated that there is no risk of error reporting of the urea tank sensor, the urea concentration detected by the urea tank sensor can be directly output at this time, that is, step S105 is executed.
Step S103: it is determined whether the urea concentration is within a preset concentration range, and step S104 is performed when it is determined that the urea concentration is not within the preset concentration range, and step S105 is performed when it is determined that the urea concentration is within the preset concentration range.
In the process of implementing step S103 specifically, it is determined whether the urea concentration is within a preset concentration range, and if the urea concentration is not within the preset concentration range, step S104 is executed, and if the urea concentration is within the preset concentration range, step S105 is executed.
It should be noted that the preset concentration range may be set in advance according to a plurality of experiments, or may be set by a technician according to experience.
Step S104: and taking the pre-stored urea concentration value as the urea concentration detected by the urea transmitter, and outputting and displaying the urea concentration.
In the process of implementing step S104, in order to reduce the error of the urea concentration detected by the urea tank sensor, the pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter, and the pre-stored urea concentration value is output to the vehicle controller to be displayed by the instrument panel of the vehicle, so that the urea concentration of the urea tank sensor conforms to the specifications of the on-board automatic diagnosis system OBD.
It should be noted that the pre-stored urea concentration may be set according to actual conditions, or may be set by a technician according to a plurality of experiments, such as: the pre-stored urea concentration value may be 32.5%.
Optionally, in the embodiment of the invention, the urea concentration is displayed through an instrument panel of the whole vehicle.
Step S105: and outputting and displaying the urea concentration.
In the process of implementing the step S105 specifically, the measured urea concentration is output to the vehicle controller to be displayed by an instrument panel of the vehicle, so that the urea concentration of the urea tank sensor conforms to the specifications of the on-board automatic diagnosis system OBD.
In the embodiment of the invention, whether the urea tank is in a unfreezing state or not is determined through the urea temperature measured by the urea tank sensor, when the urea tank is determined to be in the unfreezing state, the pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter and is output and displayed by determining whether the urea concentration is within a preset concentration range or not and determining that the urea concentration is not within the preset concentration range. The interference to the measurement process of the urea box sensor can be reduced, and therefore the phenomenon of misinformation of the urea concentration is reduced.
Based on the detection method of urea shown in the above embodiment of the present invention, in the process of executing step S102, the method includes the following steps:
step S11: the temperature change rate of urea is calculated based on the current urea temperature and the urea temperature at the previous time.
In the process of specifically implementing the step S11, the current urea temperature and the urea temperature at the previous time are calculated to obtain the temperature change rate of urea.
The temperature change rate is expressed in units of ℃/min degrees centigrade per minute, and therefore the previous time indicated above is the previous minute.
Step S12: judging whether the urea temperature is in a preset temperature range or not, and whether the temperature change rate is greater than a preset temperature change rate or not, and if the urea temperature is in the preset temperature range and the temperature change rate is greater than the preset temperature change rate, executing a step S13; if the urea temperature is not within the preset temperature range or the temperature change rate is less than or equal to the preset temperature change rate, continuously detecting the changes of the urea temperature and the urea change rate, namely returning to execute the step S11.
It should be noted that the preset temperature change rate may be set according to a plurality of experiments, or may be set according to an actual situation, for example: the preset temperature change rate may be set to 1 deg.c/min.
In step S12, the preset temperature range is a range less than or equal to the first temperature limit and greater than or equal to the second temperature limit. Wherein the first temperature limit is greater than the second temperature limit.
In the process of specifically realizing the step S12, judging whether the urea temperature is less than or equal to a first temperature limit value and is greater than or equal to a second temperature limit value; if the urea temperature is less than or equal to the first temperature limit value and greater than or equal to the second temperature limit value, it indicates that the ice floes in the urea solution may affect the detection of the concentration of the urea tank sensor, so that the concentration parameter is false-positive, step S13 is executed, and if the urea temperature is greater than the first temperature limit value or less than the second temperature limit value, step S14 is executed.
It should be noted that the first temperature limit and the second temperature limit may be set according to a plurality of experiments, or may be set according to actual situations, for example: the first temperature limit may be set to 6 deg.c and the second temperature limit may be set to-7 deg.c, that is, the preset temperature range is [ -7 deg.c, 6 deg.c ].
Step S13: and determining that the urea box is in a unfreezing state.
In the process of implementing step S13, it is described that the urea tank sensor is in a defrosted state.
Step S14: and determining that the urea box is not in a unfreezing state.
In the embodiment of the invention, whether the urea tank is in the unfreezing state is determined by determining whether the urea temperature measured by the urea tank sensor is in the preset temperature range and whether the temperature change rate is greater than the preset temperature change rate, when the urea temperature is less than or equal to the first temperature limit value and greater than or equal to the second temperature limit value, the urea tank is determined to be in the unfreezing state, so that the urea concentration measured by the urea tank sensor can be evaluated and optimized subsequently, namely whether the urea concentration is in the preset concentration range is judged, and when the urea concentration is determined to be not in the preset concentration range, the pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter and is output and displayed. The interference to the measurement process of the urea box sensor can be reduced, and therefore the phenomenon of misinformation of the urea concentration is reduced.
Based on the detection method of urea shown in the above-described embodiment of the present invention, in the process of determining whether the urea concentration is within the preset concentration range in step S103, the method includes the steps of:
step S21: and judging whether the urea concentration is greater than the first urea concentration and less than the second urea concentration, if so, executing a step S22, and if not, executing a step S23.
It should be noted that the first urea concentration and the second urea concentration may be set according to a plurality of experiments, or may be set according to actual situations, such as: the first urea concentration may be 30.75% and the second urea concentration may be 34.25%.
In the embodiment of the invention, the maximum concentration of the urea solution does not exceed 62.5%, and the minimum concentration of the urea solution does not fall below 0. Therefore, when the urea concentration is greater than or equal to the second urea concentration, it is not greater than 62.5%; the urea concentration is not less than 0 either when the urea concentration is less than or equal to the first urea concentration. That is, if the urea concentration is less than or equal to the first urea concentration and greater than 0, or the urea concentration is greater than or equal to the second urea concentration and less than 62.5%, step S23 is performed.
Step S22: and (4) taking the pre-stored urea concentration value as the urea concentration detected by the urea box sensor, and outputting and displaying the urea concentration.
Step S23: and outputting and displaying the urea concentration.
It should be noted that the specific implementation process of step S22 to step S23 is the same as the specific implementation process of step S104 to step S105, and they can be referred to each other.
In the embodiment of the invention, whether the urea box is in a unfreezing state is determined through the urea temperature measured by the urea box sensor, when the urea box is determined to be in the unfreezing state, the urea concentration measured by the urea box sensor is evaluated and optimized, namely whether the urea concentration is greater than a first urea concentration and smaller than a second urea concentration is judged, and when the urea concentration is greater than the first urea concentration and smaller than the second urea concentration, a pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter and is output and displayed. The interference to the measurement process of the urea box sensor can be reduced, and therefore the phenomenon of misinformation of the urea concentration is reduced.
In order to better understand the method for detecting urea shown in the above embodiments of the present invention, the following examples are given.
For example: assuming that the urea concentration measured by a urea box sensor is 11.75%, the current urea temperature is 3 ℃, and the urea temperature at the last moment is 1 ℃; the preset temperature change rate can be set to be 1 ℃/min; the preset temperature range is [ -7 ℃,6 ℃), wherein 6 ℃ is a first temperature limit value, and-7 ℃ is a second temperature limit value; the first urea concentration is 30.75%, and the second urea concentration is 34.25%; the pre-stored urea concentration value was 32.5%.
The urea box sensor measures the temperature and concentration of urea in real time, and the control unit obtains the urea concentration 11.75% and the urea temperature 3 ℃ measured by the urea box sensor in real time.
And calculating the current urea temperature of 3 ℃ and the urea temperature of 1 ℃ at the last moment to obtain the temperature change rate of 2 ℃/min of the urea.
When the urea temperature is determined to be 3 ℃ lower than or equal to the first temperature limit value of 6 ℃ and higher than or equal to the second temperature limit value of minus 7 ℃, it indicates that the detection of the concentration of the urea tank sensor may be affected by the ice floe in the urea solution, so that the concentration parameter detected by the urea tank sensor is mistakenly reported, and therefore, the evaluation and optimization of the urea concentration measured by the urea tank sensor are required.
When the urea concentration is determined to be 11.75% and is less than or equal to 30.75% and greater than 0 of the first urea concentration, the pre-stored urea concentration value of 32.5% is used as the urea concentration detected by the urea transmitter and is displayed on an instrument panel of the whole vehicle.
In the embodiment of the invention, whether the urea box is in a unfreezing state is determined through the urea temperature measured by the urea box sensor, when the urea box is determined to be in the unfreezing state, the pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter and is output and displayed by determining whether the urea concentration is in a preset concentration range or not. The interference to the measurement process of the urea box sensor can be reduced, and therefore the phenomenon of misinformation of the urea concentration is reduced.
Optionally, on the basis of the above-disclosed urea detection method in the embodiment of the present invention, the method further includes: and after determining that the urea concentration is not in the preset concentration range, outputting alarm information.
Compared with the urea detection method disclosed by the embodiment of the invention, after the urea concentration is determined not to be in the preset concentration range, the alarm information is output, and a user can be reminded of the interference of ice blocks and the like in the measurement of the urea box sensor, so that the user can conveniently start other protection measures, and the phenomenon of misinformation of the urea concentration is reduced.
Corresponding to the method for detecting urea shown in the embodiment of the present invention, the embodiment of the present invention also discloses a schematic structural diagram of a device for detecting urea, as shown in fig. 2, the device includes:
the obtaining unit 201 is configured to obtain a urea parameter of a urea solution of the urea tank sensor in real time.
It should be noted that the urea parameters include urea concentration and urea temperature.
A first determination unit 202 for determining whether the urea tank is in a defrost state based on a urea parameter.
And a second determining unit 203 for determining whether the urea concentration is within a preset concentration range when the urea tank is in a unfreezing state, executing the first output unit 204 when the urea concentration is determined not to be within the preset concentration range, and executing the second output unit 205 when the urea concentration is determined to be within the preset concentration range.
And a first output unit 204, which is used for taking the pre-stored urea concentration value as the urea concentration detected by the urea box sensor and outputting and displaying the urea concentration.
And a second output unit 205 for outputting and displaying the urea concentration.
The specific principle and implementation process of each unit in the urea detection device disclosed in the embodiment of the present application are the same as the urea detection control method described in the embodiment of the present application, and reference may be made to corresponding parts in the urea detection method disclosed in the embodiment of the present application, which are not described again here.
In the embodiment of the invention, whether the urea box is in a unfreezing state is determined through the urea temperature measured by the urea box sensor, when the urea box is determined to be in the unfreezing state, the pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter and is output and displayed by determining whether the urea concentration is in a preset concentration range or not. The interference to the measurement process of the urea box sensor can be reduced, and therefore the phenomenon of urea concentration misinformation is reduced.
Optionally, based on the urea detection device shown in the above embodiment of the present invention, the first determining unit 202 is specifically configured to: calculating the temperature change rate of the urea based on the current urea temperature and the urea temperature at the last moment; judging whether the urea temperature is in a preset temperature range or not, and whether the temperature change rate is greater than a preset temperature change rate or not; if the urea temperature is within a preset temperature range and the temperature change rate is greater than the preset temperature change rate, determining that the urea box is in a unfreezing state; and if the urea temperature is not in the preset temperature range, or the temperature change rate is less than or equal to the preset temperature change rate, determining that the urea box is not in a unfreezing state.
In the embodiment of the invention, whether the urea tank is in the unfreezing state is determined by determining whether the urea temperature measured by the urea tank sensor is in the preset temperature range and whether the temperature change rate is greater than the preset temperature change rate, when the urea temperature is less than or equal to the first temperature limit value and greater than or equal to the second temperature limit value, the urea tank is determined to be in the unfreezing state, so that the urea concentration measured by the urea tank sensor can be evaluated and optimized subsequently, namely whether the urea concentration is in the preset concentration range is judged, and when the urea concentration is determined to be not in the preset concentration range, the pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter and is output and displayed. The interference to the measurement process of the urea box sensor can be reduced, and therefore the phenomenon of misinformation of the urea concentration is reduced.
Optionally, based on the urea detection apparatus shown in the foregoing embodiment of the present invention, the second determining unit 203 is specifically configured to: judging whether the urea concentration is greater than the first urea concentration and less than the second urea concentration; and if the urea concentration is greater than the first urea concentration and less than the second urea concentration, taking the pre-stored urea concentration value as the urea concentration detected by the urea box sensor, and outputting and displaying the urea concentration.
Optionally, if the urea concentration is less than or equal to the first urea concentration, or greater than or equal to the second urea concentration, the urea concentration is output and displayed.
In the embodiment of the invention, whether the urea box is in a unfreezing state is determined through the urea temperature measured by the urea box sensor, when the urea box is determined to be in the unfreezing state, the urea concentration measured by the urea box sensor is evaluated and optimized, namely whether the urea concentration is greater than a first urea concentration and smaller than a second urea concentration is judged, and when the urea concentration is greater than the first urea concentration and smaller than the second urea concentration, a pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter and is output and displayed. The interference of the concentration measured by the urea box sensor can be reduced, and the risk of misinformation of the urea box sensor is reduced.
Optionally, the urea detection device shown based on the above embodiment of the present invention, with reference to fig. 2 and fig. 3, is further provided with an alarm unit 206.
And the alarm unit 206 is used for outputting alarm information after determining that the urea concentration is not in the preset concentration range.
In the embodiment of the invention, after the urea concentration is determined not to be in the preset concentration range, the alarm information is output, and a user can be reminded of the interference of ice blocks and the like in the measurement of the urea box sensor, so that the user can conveniently start other protective measures, and the phenomenon of misinformation of the urea concentration is reduced.
Based on the urea detection device disclosed in the embodiment of the present invention, the modules may be realized by a control unit including a processor and a memory, the modules may be stored in the memory as program units, and the processor calls the program units in the memory to realize the urea detection method.
Specifically, the method comprises the following steps: the control unit is used for acquiring urea parameters of a urea solution of a urea box sensor in real time, wherein the urea parameters comprise urea concentration and urea temperature; determining whether the urea tank is in a thawed state based on urea parameters; when the urea box is in a unfreezing state, determining whether the concentration of urea is within a preset concentration range; and when the urea concentration is determined not to be in the preset concentration range, outputting the pre-stored urea concentration value as the urea concentration detected by the urea box sensor.
In the embodiment of the invention, whether the urea box is in a unfreezing state is determined through the urea temperature measured by the urea box sensor, when the urea box is determined to be in the unfreezing state, the pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter and is output and displayed by determining whether the urea concentration is in a preset concentration range or not. The interference to the measurement process of the urea box sensor can be reduced, and therefore the phenomenon of misinformation of the urea concentration is reduced.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for detecting urea, which is applied to a control unit in a urea tank, and comprises the following steps:
the method comprises the steps of obtaining urea parameters of a urea solution of a urea box sensor in real time, wherein the urea parameters comprise urea concentration and urea temperature;
determining whether the urea box is in a unfreezing state or not based on the urea parameter and the urea parameter at the previous moment;
if the urea box is not in a unfreezing state, directly outputting the urea concentration detected by the urea box sensor;
when the urea box is in a unfreezing state, determining whether the urea concentration is within a preset concentration range;
and when the urea box is in a unfreezing state and the urea concentration is determined not to be in a preset concentration range, taking a pre-stored urea concentration value as the urea concentration detected by the urea box sensor, and outputting and displaying the urea concentration.
2. The method of claim 1, further comprising:
and if the urea concentration is determined to be within a preset concentration range, outputting and displaying the urea concentration.
3. The method of claim 1, wherein said determining whether said urea tank is in a thawed state based on said urea parameter comprises:
calculating the temperature change rate of the urea based on the current urea temperature and the urea temperature at the last moment;
judging whether the urea temperature is in a preset temperature range or not, and whether the temperature change rate is greater than a preset temperature change rate or not;
and if the urea temperature is within a preset temperature range and the temperature change rate is greater than a preset temperature change rate, determining that the urea box is in a unfreezing state.
4. The method of claim 1, wherein said determining whether said urea concentration is within a preset concentration range comprises:
judging whether the urea concentration is greater than a first urea concentration and less than a second urea concentration;
if the urea concentration is greater than the first urea concentration and less than the second urea concentration, directly outputting the urea concentration detected by the urea box sensor;
and if the urea concentration is smaller than the first urea concentration or larger than the second urea concentration, taking the pre-stored urea concentration value as the urea concentration detected by the urea box sensor, and outputting and displaying the urea concentration.
5. The method of claim 1, further comprising:
and after determining that the urea concentration is not in the preset concentration range, outputting alarm information.
6. A urea detection device, characterized in that it comprises:
the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring urea parameters of a urea solution of a urea box sensor in real time, and the urea parameters comprise urea concentration and urea temperature;
a first determination unit configured to determine whether the urea tank is in a defrosted state based on the urea parameter and a urea parameter at a previous time;
a second output unit for directly outputting the urea concentration detected by the urea tank sensor when the urea tank is not in a unfreezing state;
a second determination unit configured to determine whether the urea concentration is within a preset concentration range when the urea tank is in a thawing state;
and the first output unit is used for taking a pre-stored urea concentration value as the urea concentration detected by the urea tank sensor and outputting and displaying the urea concentration when the urea concentration is determined not to be in the preset concentration range.
7. The apparatus of claim 6, further comprising:
the second output unit is further used for outputting and displaying the urea concentration when the urea concentration is determined to be within a preset concentration range.
8. The apparatus according to claim 6, wherein the first determining unit is specifically configured to: calculating a temperature change rate of the urea based on a current urea temperature and a last urea temperature; judging whether the urea temperature is in a preset temperature range or not, and whether the temperature change rate is greater than a preset temperature change rate or not; and if the urea temperature is within a preset temperature range and the temperature change rate is greater than the preset temperature change rate, determining that the urea box is in a unfreezing state.
9. The apparatus according to claim 6, wherein the second determining unit is specifically configured to: judging whether the urea concentration is greater than a first urea concentration and less than a second urea concentration; if the urea concentration is greater than the first urea concentration and less than the second urea concentration, directly outputting the urea concentration detected by the urea box sensor; and if the urea concentration is smaller than the first urea concentration or larger than the second urea concentration, taking the pre-stored urea concentration value as the urea concentration detected by the urea box sensor, and outputting and displaying the urea concentration.
10. The apparatus of claim 6, further comprising:
and the alarm unit is used for outputting alarm information after determining that the urea concentration is not in a preset concentration range.
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| CN115434788B (en) * | 2022-08-12 | 2024-02-20 | 潍柴动力股份有限公司 | Urea concentration sensor device and control method |
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