CN112782229B - Urea detection method and device - Google Patents

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

A kind of detection method and device of urea

technical field

The invention relates to the technical field of urea detection, in particular to a urea detection method and device.

Background technique

At present, the parameters of the urea solution are often detected by the urea tank sensor in the urea tank to monitor the quality of the urea solution. When the urea concentration in the urea tank does not meet the standard, a fault will be reported through the on-board automatic diagnosis system OBD. During the thawing process, the floating ice in the urea solution will interfere with the measurement of the concentration of the urea tank sensor, so that the urea concentration detected by the urea tank sensor will not meet the standard, resulting in false alarms of the urea concentration.

Contents of the invention

In view of this, an embodiment of the present invention provides a urea detection method and device to solve the phenomenon of false reporting of urea concentration in the prior art.

In order to achieve the above purpose, embodiments of the present invention provide the following technical solutions:

On the one hand, the embodiment of the present invention discloses a method for detecting urea, which is applied to the control unit in the urea tank, and the method includes:

Obtaining the urea parameters of the urea solution of the urea tank sensor in real time, the urea parameters including urea concentration and urea temperature;

determining whether the urea tank is in a defrosted state based on the urea parameters;

When the urea tank is in a defrosted state, determine whether the urea concentration is within a preset concentration range;

When it is determined that the urea concentration is not within the preset concentration range, the pre-stored urea concentration value is used as the urea concentration detected by the urea tank sensor, and is output for display.

Optionally, also include:

If it is determined that the urea concentration is within a preset concentration range, the urea concentration is output and displayed.

Optionally, the determining whether the urea tank is in a defrosted state based on the urea parameters includes:

Calculate the temperature change rate of the urea based on the current urea temperature and the urea temperature at the previous moment;

Judging whether the urea temperature is within a preset temperature range, and whether the temperature change rate is greater than a preset temperature change rate;

If the temperature of the urea is within a preset temperature range and the temperature change rate is greater than the preset temperature change rate, it is determined that the urea tank is in an unfreezing state.

Optionally, the determining whether the urea concentration is within a preset concentration range includes:

judging whether the urea concentration is greater than the first urea concentration and less than the second urea concentration;

If the urea concentration is greater than the first urea concentration and less than the second urea concentration, the pre-stored urea concentration value is used as the urea concentration detected by the urea tank sensor, and output and displayed.

Optionally, also include:

After it is determined that the urea concentration is not within the preset concentration range, an alarm message is output.

On the other hand, the embodiment of the present invention discloses a urea detection device, the device comprising:

The acquisition unit is used to acquire the urea parameters of the urea solution of the urea tank sensor in real time, the urea parameters including 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 parameters;

A second determination unit, configured to determine whether the urea concentration is within a preset concentration range when the urea tank is in a defrosted state;

The first output unit is configured to use the pre-stored urea concentration value as the urea concentration detected by the urea tank sensor when it is determined that the urea concentration is not within the preset concentration range, and output and display it.

Optionally, also include:

The second output unit is configured to output and display the urea concentration when it is determined that the urea concentration is within a preset concentration range.

Optionally, the first determination unit is specifically configured to: calculate the temperature change rate of the urea based on the current urea temperature and the urea temperature at the previous moment; determine whether the urea temperature is within a preset temperature range, the Whether the temperature change rate is greater than a preset temperature change rate; if the temperature of the urea is within a preset temperature range and the temperature change rate is greater than the preset temperature change rate, it is determined that the urea tank is in a defrosted state.

Optionally, the second determining unit is specifically configured to: determine whether the urea concentration is greater than the first urea concentration and less than the second urea concentration; if the urea concentration is greater than the first urea concentration and less than the second urea concentration Concentration, the pre-stored urea concentration value is used as the urea concentration detected by the urea tank sensor, and output and displayed.

Optionally, also include:

The alarm unit is configured to output alarm information after determining that the urea concentration is not within a preset concentration range.

A urea detection method and device provided based on the above-mentioned embodiments of the present invention are applied to the control unit in the urea tank. The method includes: acquiring the urea parameters of the urea solution of the urea tank sensor in real time, and the urea parameters include urea concentration and urea temperature ; determine whether the urea tank is in a defrosted state based on the urea parameters; determine whether the urea concentration is within a preset concentration range when the urea tank is in a defrosted state; The urea concentration value is used as the urea concentration detected by the urea tank sensor, and output and displayed. In the embodiment of the present invention, it is determined whether the urea tank is in the unfreezing state by the urea temperature measured by the urea tank sensor. When the concentration is within the preset concentration range, the pre-stored urea concentration value will be used as the urea concentration detected by the urea transmitter, and output and displayed. The interference to the measurement process of the urea tank sensor can be reduced, thereby reducing the false report of the urea concentration.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is the schematic flow chart of a kind of detection method of urea provided by the embodiment of the present invention;

Fig. 2 is a schematic structural view of a urea detection device provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of another urea detection device provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In this application, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes none. other elements specifically listed, or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

In the embodiment of the present invention, it is determined whether the urea tank is in the unfreezing state by the urea temperature measured by the urea tank sensor. When the concentration range is preset, the pre-stored urea concentration value will be used as the urea concentration detected by the urea transmitter, and output and displayed. The interference to the measurement process of the urea tank sensor can be reduced, thereby reducing the false report of the urea concentration.

In the embodiment of the present invention, the urea tank is connected with the engine of the vehicle for processing the exhaust of the engine, the urea tank is provided with a urea tank sensor and a control unit; that is to say, the control unit in the urea tank is connected with the vehicle control device connection. The urea tank sensor is used to collect urea parameters such as urea temperature and concentration in real time; the control unit is used to process the urea temperature and concentration collected by the urea tank sensor.

Optionally, the urea tank is also provided with a container that can be used to store the urea aqueous solution assembled and assembled by other accessory devices.

It should be noted that the urea tank sensor shown in the embodiment of the present invention is a National VI urea tank sensor.

Referring to Fig. 1, it is a schematic flow diagram of a detection method for urea shown in an embodiment of the present invention, which is applied to a control unit in a urea tank, and the method includes:

Step S101: Obtain the urea parameters of the urea solution of the urea tank 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, the urea tank sensor measures the temperature and concentration of urea in real time, and the control unit acquires the urea concentration and urea temperature measured by the urea tank sensor in real time.

It should be noted that the urea tank sensor is a sensor that converts the detected parameters corresponding to urea into available output signals.

Step S102: Determine whether the urea tank is in the unfreezing state based on the urea parameters. If the urea tank is in the unfreezing state, execute steps S103 to S105. If the urea tank is not in the unfreezing state, it means that the urea tank sensor does not have the risk of false alarm, then Execute step S105.

In the process of implementing step S102, determine whether the urea tank is in the process of thawing through the urea temperature, that is, the thawing state; when it is determined that the urea tank is in the process of thawing, it means that the floating ice in the urea solution may affect the sensor of the urea tank Concentration detection, so that the urea tank sensor has the risk of false reporting. At this time, it is necessary to evaluate and optimize the urea concentration measured by the urea tank sensor, that is, perform steps S103 to S105; when the urea tank is not in the defrosted state, it means that the urea tank sensor There is no risk of false reporting, and at this time, the urea concentration detected by the urea tank sensor can be directly output, that is, step S105 is executed.

Step S103: Determine whether the urea concentration is within the preset concentration range. If it is determined that the urea concentration is not within the preset concentration range, perform step S104. If it is determined that the urea concentration is within the preset concentration range, perform step S105.

In the process of implementing step S103, it is judged whether the urea concentration is within the preset concentration range, if the urea concentration is not within the preset concentration range, step S104 is executed, and if the urea concentration is within the preset range, step S105 is executed.

It should be noted that the preset concentration range may be set in advance based on multiple experiments, or may be set by a technician based on experience.

Step S104: Use the pre-stored urea concentration value as the urea concentration detected by the urea transmitter, and output and display it.

In the process of implementing step S104, in order to reduce the false report 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 The car controller is used to display on the instrument panel of the whole car, so that the urea concentration of the urea tank sensor complies with the regulations 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 technicians based on multiple experiments, for example, the pre-stored urea concentration may be 32.5%.

Optionally, in this embodiment of the present invention, the urea concentration is displayed on the instrument panel of the whole vehicle.

Step S105: Output and display the urea concentration.

In the process of implementing step S105, the measured urea concentration is output to the vehicle controller for display on the instrument panel of the vehicle, so that the urea concentration of the urea tank sensor meets the requirements of the on-board automatic diagnosis system OBD.

In the embodiment of the present invention, it is determined whether the urea tank is in the unfreezing state by the urea temperature measured by the urea tank sensor. When the concentration range is preset, the pre-stored urea concentration value will be used as the urea concentration detected by the urea transmitter, and output and displayed. The interference to the measurement process of the urea tank sensor can be reduced, thereby reducing the false report of the urea concentration.

Based on the detection method of urea shown in the above-mentioned embodiments of the present invention, in the process of performing step S102, the following steps are included:

Step S11: Calculate the temperature change rate of urea based on the current urea temperature and the urea temperature at the previous moment.

In the process of implementing step S11, the current urea temperature and the urea temperature at the previous moment are calculated to obtain the temperature change rate of urea.

It should be noted that the unit of the rate of temperature change is °C/min in centigrade per minute, therefore, the previous moment shown above refers to the previous minute.

Step S12: Determine whether the urea temperature is within the preset temperature range, and whether the temperature change rate is greater than the preset temperature change rate, if the urea temperature is within the preset temperature range, and the temperature change rate is greater than the preset temperature change rate, execute 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, continue to detect changes in the urea temperature and urea change rate, that is, return to step S11.

It should be noted that the preset temperature change rate can be set based on multiple experiments, or can be set according to actual conditions, for example: the preset temperature change rate can be set to 1° C./min.

In step S12, the preset temperature range refers to a range that is 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 implementing step S12, it is judged whether the urea temperature is less than or equal to the first temperature limit and greater than or equal to the range of the second temperature limit; if the urea temperature is less than or equal to the first temperature limit, it is greater than or equal to the second temperature limit. When the temperature limit is set, it means that the floating ice in the urea solution may affect the detection of the concentration of the urea tank sensor, so that the concentration parameter error occurs, and then step S13 is executed. If the urea temperature is greater than the first temperature limit, or less than the second When the temperature is limited, step S14 is executed.

It should be noted that the first temperature limit and the second temperature limit can be set according to multiple experiments, or can be set according to actual conditions, for example: the first temperature limit can be set to 6°C, the second The temperature limit can be set to -7°C, that is to say, the preset temperature range is [-7°C, 6°C].

Step S13: Determine that the urea tank is in a defrosted state.

In the process of implementing step S13, it is illustrated that the sensor of the urea tank is in the unfreezing state.

Step S14: Determine that the urea tank is not in a defrosted state.

In the embodiment of the present invention, by determining whether the urea temperature measured by the urea tank sensor is within a preset temperature range, and whether the temperature change rate is greater than the preset temperature change rate, to determine whether the urea tank is in a defrosted state, at the urea temperature When it is less than or equal to the first temperature limit and greater than or equal to the second temperature limit, it is determined that the urea tank is in the unfreezing state, so as to facilitate subsequent evaluation and optimization of the urea concentration measured by the urea tank sensor, that is, to determine whether the urea concentration is within the preset Within the concentration range, when it is determined that the urea concentration is not within the preset concentration range, the pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter, and output and displayed. The interference to the measurement process of the urea tank sensor can be reduced, thereby reducing the false report of the urea concentration.

Based on the urea detection method shown in the above-mentioned embodiments of the present invention, in the process of performing step S103 to determine whether the urea concentration is within a preset concentration range, the following steps are included:

Step S21: Determine whether the urea concentration is greater than the first urea concentration and less than the second urea concentration. If the urea concentration is greater than the first urea concentration and less than the second urea concentration, perform step S22. If the urea concentration is less than or equal to the first urea concentration concentration, or, when the urea concentration is greater than or equal to the second urea concentration, step S23 is executed.

It should be noted that the first urea concentration and the second urea concentration can be set according to multiple experiments, and can also be set according to actual conditions, such as: the first urea concentration can be 30.75%, and the second urea concentration can be 34.25%.

In the embodiment of the present invention, since the highest concentration of the urea solution will not exceed 62.5%, the lowest concentration of the urea solution will not be lower than zero. Therefore, when the urea concentration is greater than or equal to the second urea concentration, it will not be greater than 62.5%; when the urea concentration is less than or equal to the first urea concentration, it will not be less than 0. That is, if the urea concentration is less than or equal to the first urea concentration and greater than 0, or if the urea concentration is greater than or equal to the second urea concentration and less than 62.5%, step S23 is executed.

Step S22: Use the pre-stored urea concentration value as the urea concentration detected by the urea tank sensor, and output and display it.

Step S23: Output and display 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 above step S104 to step S105, and may refer to each other.

In the embodiment of the present invention, it is determined whether the urea tank is in the unfreezing state by the urea temperature measured by the urea tank sensor. The first urea concentration is less than the second urea concentration. When the urea concentration is greater than the first urea concentration and less than the second urea concentration, the pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter, and output and displayed. The interference to the measurement process of the urea tank sensor can be reduced, thereby reducing the false report of the urea concentration.

In order to better understand the method for detecting urea shown in the above-mentioned embodiments of the present invention, an example is given below.

For example: suppose the urea concentration measured by the urea tank sensor is 11.75%, the current urea temperature is 3°C, and the urea temperature at the last moment is 1°C; the preset temperature change rate can be set to 1°C/min; the preset temperature The range is [-7°C, 6°C], where 6°C is the first temperature limit, -7°C is the second temperature limit; the first urea concentration is 30.75%, and the second urea concentration is 34.25%; pre-stored The urea concentration value is 32.5%.

The urea tank sensor measures the temperature and concentration of urea in real time, and the control unit acquires the urea concentration 11.75% and urea temperature 3°C measured by the urea tank sensor in real time.

Calculate the current urea temperature of 3°C and the previous urea temperature of 1°C to obtain a urea temperature change rate of 2°C/min.

When it is determined that the urea temperature 3°C is less than or equal to the first temperature limit of 6°C and greater than or equal to the second temperature limit of -7°C, it means that the ice floes in the urea solution may affect the detection of the concentration of the urea tank sensor, resulting in The concentration parameter detected by the urea tank sensor is wrongly reported, so it is necessary to evaluate and optimize the urea concentration measured by the urea tank sensor.

When it is determined that the urea concentration 11.75% is less than or equal to the first urea concentration 30.75% and greater than 0, the pre-stored urea concentration value 32.5% is used as the urea concentration detected by the urea transmitter and displayed on the dashboard of the vehicle.

In the embodiment of the present invention, it is determined whether the urea tank is in the unfreezing state by the urea temperature measured by the urea tank sensor. When the concentration range is preset, the pre-stored urea concentration value will be used as the urea concentration detected by the urea transmitter, and output and displayed. The interference to the measurement process of the urea tank sensor can be reduced, thereby reducing the false report of the urea concentration.

Optionally, on the basis of the urea detection method disclosed above in the embodiment of the present invention, it further includes: outputting an alarm message after determining that the urea concentration is not within a preset concentration range.

Compared with the urea detection method disclosed above in the embodiment of the present invention, after it is determined that the urea concentration is not within the preset concentration range, an alarm message is output, which can remind the user that there is interference such as ice cubes in the measurement of the urea tank sensor, so that the user can start other protection measures, thereby reducing the phenomenon of false reporting of urea concentration.

Corresponding to the urea detection method shown in the above-mentioned embodiment of the present invention, the embodiment of the present invention also discloses a structural schematic diagram of a urea detection device correspondingly, as shown in FIG. 2 , the device includes:

The acquiring unit 201 is configured to acquire the urea parameters of the urea solution of the urea tank sensor in real time.

It should be noted that the urea parameters include urea concentration and urea temperature.

The first determination unit 202 is configured to determine whether the urea tank is in a defrosted state based on urea parameters.

The second determination unit 203 is used to determine whether the urea concentration is within the preset concentration range when the urea tank is in the unfreezing state. When it is determined that the urea concentration is not within the preset concentration range, execute the first output unit 204. When the concentration is within the preset concentration range, the second output unit 205 is executed.

The first output unit 204 is configured to use the pre-stored urea concentration value as the urea concentration detected by the urea tank sensor, and output and display it.

The second output unit 205 outputs and displays the urea concentration.

It should be noted that the specific principle and execution process of each unit in the urea detection device disclosed in the above-mentioned embodiment of the present application are the same as the urea detection and control method shown in the above-mentioned implementation of the present application. Please refer to the disclosure of the above-mentioned embodiment of the present application The corresponding part in the detection method of urea will not be repeated here.

In the embodiment of the present invention, it is determined whether the urea tank is in the unfreezing state by the urea temperature measured by the urea tank sensor. When the concentration range is preset, the pre-stored urea concentration value will be used as the urea concentration detected by the urea transmitter, and output and displayed. The interference to the measurement process of the urea tank sensor can be reduced, thereby reducing the false report of the urea concentration.

Optionally, based on the urea detection device shown in the above-mentioned embodiments of the present invention, the first determination unit 202 is specifically configured to: calculate the temperature change rate of urea based on the current urea temperature and the urea temperature at the previous moment; determine whether the urea temperature is within Within the preset temperature range, whether the temperature change rate is greater than the preset temperature change rate; if the urea temperature is within the preset temperature range, and the temperature change rate is greater than the preset temperature change rate, it is determined that the urea tank is in the unfreezing state; if the urea If the temperature is not within the preset temperature range, or the temperature change rate is less than or equal to the preset temperature change rate, it is determined that the urea tank is not in the defrosting state.

In the embodiment of the present invention, by determining whether the urea temperature measured by the urea tank sensor is within a preset temperature range, and whether the temperature change rate is greater than the preset temperature change rate, to determine whether the urea tank is in a defrosted state, at the urea temperature When it is less than or equal to the first temperature limit and greater than or equal to the second temperature limit, it is determined that the urea tank is in the unfreezing state, so as to facilitate subsequent evaluation and optimization of the urea concentration measured by the urea tank sensor, that is, to determine whether the urea concentration is within the preset Within the concentration range, when it is determined that the urea concentration is not within the preset concentration range, the pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter, and output and displayed. The interference to the measurement process of the urea tank sensor can be reduced, thereby reducing the false report of the urea concentration.

Optionally, based on the urea detection device shown in the above-mentioned embodiments of the present invention, the second determination unit 203 is specifically configured to: determine whether the urea concentration is greater than the first urea concentration and less than the second urea concentration; if the urea concentration is greater than the first urea concentration When the concentration is lower than the second urea concentration, the pre-stored urea concentration value is used as the urea concentration detected by the urea tank sensor, and output and displayed.

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 present invention, it is determined whether the urea tank is in the unfreezing state by the urea temperature measured by the urea tank sensor. The first urea concentration is less than the second urea concentration. When the urea concentration is greater than the first urea concentration and less than the second urea concentration, the pre-stored urea concentration value is used as the urea concentration detected by the urea transmitter, and output and displayed. The interference of concentration measurement by the urea tank sensor can be reduced, thereby reducing the risk of false alarm by the urea tank sensor.

Optionally, based on the urea detection device shown in the above embodiments of the present invention, referring to FIG. 2 , referring to FIG. 3 , the urea detection device is further provided with an alarm unit 206 .

The alarm unit 206 is configured to output alarm information after determining that the urea concentration is not within the preset concentration range.

In the embodiment of the present invention, after it is determined that the urea concentration is not within the preset concentration range, an alarm message is output, which can remind the user that there is interference such as ice cubes in the measurement of the urea tank sensor, so that the user can start other protective measures, thereby reducing the urea concentration. The phenomenon of false positives.

Based on the urea detection device disclosed in the above-mentioned embodiments of the present invention, the above-mentioned modules can be realized by a control unit composed of a processor and a memory, and the above-mentioned modules are stored in the memory as program units, and the above-mentioned modules in the memory are called by the processor Program unit to realize the detection method of urea.

Specifically: the control unit is used to obtain the urea parameters of the urea solution of the urea tank sensor in real time, and the urea parameters include urea concentration and urea temperature; determine whether the urea tank is in a thawed state based on the urea parameters; when the urea tank is in a thawed state, determine Whether the urea concentration is within the preset concentration range; when it is determined that the urea concentration is not within the preset concentration range, the pre-stored urea concentration value is used as the urea concentration detected by the urea tank sensor, and output.

In the embodiment of the present invention, it is determined whether the urea tank is in the unfreezing state by the urea temperature measured by the urea tank sensor. When the concentration range is preset, the pre-stored urea concentration value will be used as the urea concentration detected by the urea transmitter, and output and displayed. The interference to the measurement process of the urea tank sensor can be reduced, thereby reducing the false report of the urea concentration.

Each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for related parts, please refer to the part of the description of the method embodiment. The systems and system embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is It can be located in one place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without creative effort.

Professionals can further realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the possible Interchangeability, in the above description, the components and steps of each example have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not 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 detection method of urea, is characterized in that, is applied to the control unit in the urea tank, and described method comprises: Obtaining the urea parameters of the urea solution of the urea tank sensor in real time, the urea parameters including urea concentration and urea temperature; Determine whether the urea tank is in a defrosted state based on the urea parameter and the urea parameter at the last moment; If the urea tank is not in the thawed state, directly output the urea concentration detected by the urea tank sensor; When the urea tank is in a defrosted state, determine whether the urea concentration is within a preset concentration range; When the urea tank is in the unfreezing state and it is determined that the urea concentration is not within the preset concentration range, the pre-stored urea concentration value is used as the urea concentration detected by the urea tank sensor, and output and displayed. 2. The method according to claim 1, further comprising: If it is determined that the urea concentration is within a preset concentration range, the urea concentration is output and displayed. 3. The method according to claim 1, wherein the determining whether the urea tank is in a thawed state based on the urea parameter comprises: Calculate the temperature change rate of the urea based on the current urea temperature and the urea temperature at the previous moment; Judging whether the urea temperature is within a preset temperature range, and whether the temperature change rate is greater than a preset temperature change rate; If the temperature of the urea is within a preset temperature range and the temperature change rate is greater than the preset temperature change rate, it is determined that the urea tank is in an unfreezing state. 4. The method according to claim 1, wherein said determination of whether said urea concentration is within a preset concentration range comprises: judging whether the urea concentration is greater than the first urea concentration and less than the second urea concentration; If the urea concentration is greater than the first urea concentration and less than the second urea concentration, then directly output the urea concentration detected by the urea tank sensor; If the urea concentration is less than the first urea concentration or greater than the second urea concentration, the pre-stored urea concentration value is used as the urea concentration detected by the urea tank sensor, and output and displayed. 5. The method according to claim 1, further comprising: After it is determined that the urea concentration is not within the preset concentration range, an alarm message is output. 6. A detection device for urea, characterized in that said device comprises: The acquisition unit is used to acquire the urea parameters of the urea solution of the urea tank sensor in real time, the urea parameters including urea concentration and urea temperature; A first determining unit, configured to determine whether the urea tank is in a defrosted state based on the urea parameter and the urea parameter at the last moment; The second output unit is used to directly output the urea concentration detected by the urea tank sensor when the urea tank is not in a defrosted 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 defrosted state; The first output unit is configured to use the pre-stored urea concentration value as the urea concentration detected by the urea tank sensor when it is determined that the urea concentration is not within the preset concentration range, and output and display it. 7. The device according to claim 6, further comprising: The second output unit is further configured to output and display the urea concentration when it is determined that the urea concentration is within a preset concentration range. 8. The device according to claim 6, wherein the first determination unit is specifically configured to: calculate the temperature change rate of the urea based on the current urea temperature and the urea temperature at the previous moment; determine the temperature change rate of the urea Whether the temperature is within the preset temperature range, and whether the temperature change rate is greater than the preset temperature change rate; if the urea temperature is within the preset temperature range, and the temperature change rate is greater than the preset temperature change rate, Make sure that the urea tank is in a defrosted state. 9. The device according to claim 6, wherein the second determining unit is specifically used to: judge whether the urea concentration is greater than the first urea concentration and less than the second urea concentration; if the urea concentration When it is greater than the first urea concentration and less than the second urea concentration, it will directly output the urea concentration detected by the urea tank sensor; if the urea concentration is less than the first urea concentration, or greater than the second urea concentration, it will be stored in advance The urea concentration value is used as the urea concentration detected by the urea tank sensor, and the output is displayed. 10. The device according to claim 6, further comprising: The alarm unit is configured to output alarm information after determining that the urea concentration is not within a preset concentration range.

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