CN212411587U - Automobile urea concentration detection system based on ultrasonic waves - Google Patents
Automobile urea concentration detection system based on ultrasonic waves Download PDFInfo
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- CN212411587U CN212411587U CN202021503489.1U CN202021503489U CN212411587U CN 212411587 U CN212411587 U CN 212411587U CN 202021503489 U CN202021503489 U CN 202021503489U CN 212411587 U CN212411587 U CN 212411587U
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Abstract
The utility model provides an automobile urea concentration detection system based on ultrasonic wave, include: the urea solution tank is used for preparing, detecting and storing urea solution; the urea particle filling machine is used for filling urea particles into the urea solution tank; the purified water filling machine is used for filling purified water into the urea solution tank; the urea solution filling machine is used for filling urea solution with preset concentration into the urea solution tank; a temperature-tunable tank, the urea solution tank being disposed within the temperature-tunable tank; the ultrasonic sensor comprises an ultrasonic transmitter and an ultrasonic receiver, wherein the ultrasonic transmitter and the ultrasonic receiver are respectively and oppositely arranged on the inner side wall of the urea solution tank. The ultrasonic sensor is used for detecting the concentration of the urea solution, the detection mode is simple and convenient, the concentration of the urea solution at different temperatures can be effectively detected, and the method has the advantages of high accuracy of detection data of the concentration of the urea solution, simple and convenient detection mode, good real-time performance and the like.
Description
Technical Field
The utility model relates to a urea concentration detection area, concretely relates to car urea case concentration detection system based on ultrasonic wave.
Background
At present, automobiles are widely popularized to various family lives as main vehicles of roads, and accordingly, the automobile exhaust pollution also needs to be prevented. Carbon dioxide (CO2), sulfur compounds SOx (SO and SO2), nitrogen oxides NOx (NO and NO2), chlorofluorocarbons and the like in automobile exhaust gas make the atmospheric environmental problems such as greenhouse effect, ozone layer destruction and acid rain more serious; the exhaust gas contains CO, NOx, SOx, unburned hydrocarbons HC, particulate matter PM, and odorous gases, which pollute the air and are harmful to humans, animals, and plants.
The exhaust emission of diesel vehicles must meet the new national standard of emission, and in the automobile manufacturing industry, automobile urea is required to be used for purifying the pollution of the automobile exhaust to the atmosphere. Automobile urea, which is a liquid used in the SCR technology for reducing nitrogen oxide pollution in diesel exhaust, consists of 32.5% of high purity urea and 67.5% of deionized water. In order to ensure the purification effect of automobile exhaust, parameters such as the concentration of a urea solution in a urea tank, the liquid level of the urea solution and the like need to be detected in real time, and at present, the detection of the solution in the urea tank of an automobile has the following defects:
1. at present, the concentration of the urea tank solution of most diesel vehicles is detected in a traditional mode and is obtained by calculating the ratio of the mass of the solvent to the mass of the solution, the mass of the initial solvent and the mass of the solute need to be known in each detection, statistics is very inconvenient, and the real-time performance of data detection is poor;
2. the temperature of the urea box of the automobile under different running states has great change, can lead to the urea box solution concentration to follow the change, and the urea solution concentration that adopts traditional detection method to obtain is inaccurate to can lead to exhaust emission not up to standard.
SUMMERY OF THE UTILITY MODEL
The aforesaid to prior art existence is not enough, the utility model aims to provide a: the utility model provides an automobile urea concentration detection system based on ultrasonic wave, adopt ultrasonic sensor to detect the flight time of ultrasonic wave in urea solution, adopt level sensor real-time detection urea solution jar liquid level information, adopt temperature sensor real-time detection urea solution jar in temperature information, calculate real-time urea solution concentration according to temperature and ultrasonic wave flight time, can real-time detection urea solution concentration, can effectively detect the urea solution concentration under the different temperatures. The method has the advantages of high accuracy of urea solution concentration detection data, simple detection mode, good instantaneity and the like.
An automobile urea concentration detection system based on ultrasonic waves comprises:
the urea solution tank is used for preparing, detecting and storing urea solution;
the urea particle filling machine is communicated with the first filling port of the urea solution tank body and is used for filling urea particles into the urea solution tank;
the purified water filling machine is communicated with a second filling port of the urea solution tank body and is used for filling purified water into the urea solution tank;
the urea solution filling machine is communicated with a third filling port of the urea solution tank body and is used for filling urea solution with preset concentration into the urea solution tank;
a temperature-tunable tank, the urea solution tank being disposed within the temperature-tunable tank;
the ultrasonic sensor comprises an ultrasonic transmitter and an ultrasonic receiver, wherein the ultrasonic transmitter and the ultrasonic receiver are respectively and oppositely arranged on the inner side wall of the urea solution tank.
The first control end of the PC console is connected with the urea particle filling machine and is used for controlling the filling amount of urea particles; the second control end is connected with the purified water filling machine and is used for controlling the filling amount of the purified water; the third control end is connected with the urea solution filling machine and used for controlling the filling amount of the urea solution; the fourth control end is connected with the temperature adjustable box and used for adjusting the temperature inside the temperature adjustable box.
Further, still include miniature oil-well pump, miniature oil-well pump fixed mounting is in the bottom intermediate position in the urea solution jar, and the fifth control end of miniature oil-well pump and PC control cabinet is connected for homogenize the solution in the urea solution jar.
The device further comprises a liquid level sensor and a temperature sensor, wherein the liquid level sensor is vertically and fixedly arranged on the inner side wall of the urea solution tank and is used for detecting the liquid level of the solution in the urea solution tank in real time; the temperature sensor is arranged in the middle of the inner side wall of the urea solution tank and used for detecting the temperature in the urea solution tank in real time.
The intelligent liquid level meter is characterized by further comprising a microprocessor, wherein a first information receiving end of the microprocessor is connected with the ultrasonic sensor, a second information receiving end of the microprocessor is connected with the liquid level sensor, a third information receiving end of the microprocessor is connected with the temperature sensor, a power supply end of the microprocessor is connected with a power supply end of the PC console, and a communication end of the microprocessor is connected with a communication end of the PC console.
The system further comprises a data acquisition card, wherein the data acquisition card is connected between the microprocessor and the PC console, one end of the data acquisition card is connected with the communication end of the microprocessor, and the other end of the data acquisition card is connected with the communication end of the PC console; and the power supply end of the microprocessor is connected with the power supply end of the PC console through the USB interface.
Further, a liquid outlet is formed in the bottom of the urea solution tank and used for discharging waste liquid after detection is finished; and a liquid discharge pipe is connected at the liquid discharge port, and waste liquid is discharged out of the temperature adjustable box through the liquid discharge pipe.
The metering liquid discharge valve is arranged on the liquid discharge pipe and used for controlling the opening and closing of the liquid discharge pipe, and the metering liquid discharge valve is connected with a sixth control end of the PC console.
Further, the urea particle filling machine comprises a urea particle storage box, an electronic balance and a filling device, the filling device is connected with a first control end of a PC console, the filling device comprises a first pushing arm and a second pushing arm, the first pushing arm is used for pushing urea particles from the urea particle storage box to the electronic balance, the second pushing arm is used for pushing the urea particles from the electronic balance to a feeding hole of the filling device, and a discharging hole of the filling device is communicated with the urea solution tank.
Furthermore, a circle of heat preservation asbestos is arranged on the inner side wall of the temperature adjustable box.
Compared with the prior art, the utility model has the advantages of it is following:
the utility model provides an automobile urea concentration detection system based on ultrasonic wave, which adopts an ultrasonic sensor to detect the flight time of the ultrasonic wave in the urea solution, calculates the real-time urea solution concentration according to the temperature and the ultrasonic wave flight time, has simple and convenient detection mode, and can quickly acquire the corresponding urea solution concentration at the temperature only by looking up the table at the later stage; meanwhile, the liquid level sensor can be used for detecting liquid level information in the urea solution tank in real time, the temperature sensor is used for detecting temperature information in the urea solution tank in real time, the concentration of the urea solution at different temperatures can be effectively detected, and the device has the advantages of high accuracy of urea solution concentration detection data, simple and convenient detection mode, good real-time performance and the like.
Drawings
FIG. 1 is a system block diagram of a urea concentration detection system according to a first embodiment of the present invention;
FIG. 2 is a control flow chart of a urea concentration detection method according to a second embodiment of the present invention;
FIG. 3 is a flow chart of detecting a real-time liquid level in a tank by using a liquid level sensor according to a second embodiment of the present invention;
FIG. 4 is a flow chart of detecting the real-time temperature inside the tank by using the liquid level sensor in the second embodiment of the present invention;
fig. 5 is a flowchart of detecting the real-time concentration in the tank by using the ultrasonic sensor in the second embodiment of the present invention;
fig. 6 is a diagram of raw data detected by each sensor in an embodiment of the present invention;
FIG. 7 is a time chart of the urea solution varying with temperature according to the embodiment of the present invention;
FIG. 8 is a graph showing the relationship between the flight speed of the ultrasonic waves and the temperature of the urea solution in the embodiment of the present invention;
FIG. 9 is a graph showing the relationship between the standard urea solution temperature and the ultrasonic flight speed and other parameters in the embodiment of the present invention;
fig. 10 is a schematic view of monitoring temperature, concentration and liquid level in an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows:
referring to fig. 1, an ultrasonic-based automobile urea concentration detection system includes:
the urea solution tank is used for preparing, detecting and storing urea solution; specifically, the shape of the urea solution tank is not limited, and may be a tank, a barrel, a square, a pool, or the like.
The urea particle filling machine is communicated with the first filling port of the urea solution tank body and is used for filling urea particles into the urea solution tank; specifically, the diameter of the urea particles ranges from 0.5mm to 2mm, and the diameter of the urea particles is preferably 1 mm; urea powder can be adopted, so that the urea powder is conveniently and quickly dissolved into the solution; the small urea particles and the powder are convenient and accurate to calculate the weight, and the concentration detection precision of the urea solution is improved.
The purified water filling machine is communicated with a second filling port of the urea solution tank body and is used for filling purified water into the urea solution tank; specifically, common tap water can be adopted for replacement, so that the cost is reduced; the concentration detection precision of the urea solution can be improved by optimizing distilled water, and meanwhile, the impurity content in the solution can be reduced, so that the automobile exhaust discharge pipe is prevented from being blocked due to excessive impurities.
The urea solution filling machine is communicated with a third filling port of the urea solution tank body and is used for filling urea solution with preset concentration into the urea solution tank; specifically, the urea solution in the urea solution filling machine is prepared in advance, and the concentration of the urea solution can be set in advance according to requirements; because the characteristic that urea itself volatilizes easily, the solution of urea solution filling machine the inside needs the periodic replacement to guarantee that urea solution concentration is in the error range that volatilizees, guarantee the accuracy that urea concentration detected in the urea solution jar.
A temperature-tunable tank, the urea solution tank being disposed within the temperature-tunable tank; specifically, the temperature adjusting range of the temperature adjustable box is between-50 ℃ and +100 ℃.
The ultrasonic sensor comprises an ultrasonic transmitter and an ultrasonic receiver, and the ultrasonic transmitter and the ultrasonic receiver are respectively and oppositely arranged on the inner side wall of the urea solution tank; specifically, ultrasonic emitter and ultrasonic receiver install on same water flat line, and ultrasonic emitter and ultrasonic receiver's mounted position is in minimum preset liquid level below at urea solution tank inside wall the latter half, can avoid the solution liquid level to cross when low and do not influence ultrasonic sensor's detection like this, guarantees to detect the accuracy.
The automobile urea concentration detection system based on ultrasonic waves further comprises a PC console, wherein a first control end of the PC console is connected with the urea particle filling machine and used for controlling the filling amount of urea particles; the second control end is connected with the purified water filling machine and is used for controlling the filling amount of the purified water; the third control end is connected with the urea solution filling machine and used for controlling the filling amount of the urea solution; the fourth control end is connected with the temperature adjustable box and used for adjusting the temperature inside the temperature adjustable box. Specifically, the PC console may be a computer and is connected to the urea granule filling machine, the purified water filling machine, the urea solution filling machine, and the temperature-adjustable tank through data lines, respectively.
Above-mentioned automobile urea concentration detection system based on ultrasonic wave still includes miniature oil-well pump, miniature oil-well pump fixed mounting is in the bottom intermediate position in the urea solution jar, and the fifth control end of miniature oil-well pump and PC control cabinet is connected for homogenize the solution in the urea solution jar. Specifically, the micro oil well pump is connected with a fifth control end of the PC console through a data line, and the micro oil well pump with a specific wireless communication function can also be adopted; during specific implementation, the miniature oil well pump can be replaced by a miniature stirrer, so that the cost is reduced.
The automobile urea concentration detection system based on ultrasonic waves further comprises a liquid level sensor and a temperature sensor, wherein the liquid level sensor is vertically and fixedly arranged on the inner side wall of the urea solution tank and is used for detecting the liquid level of the solution in the urea solution tank in real time; the temperature sensor is arranged in the middle of the inner side wall of the urea solution tank and used for detecting the temperature in the urea solution tank in real time. Specifically, the liquid level sensor can adopt a floating ball type liquid level sensor or a static pressure type liquid level sensor, wherein the floating ball type liquid level sensor is composed of a magnetic floating ball, a measuring conduit, a signal unit, an electronic unit, a junction box and an installation piece, the magnetic floating ball floats on the liquid level and moves up and down along the measuring conduit, a measuring element arranged in the conduit can convert a measured liquid level signal into a resistance signal which is in direct proportion to the change of the liquid level under the action of external magnetism, and the electronic unit is converted into 4-20 mA or other standard signals to be output. The static pressure type liquid level sensor generally adopts a silicon pressure measuring sensor to convert the measured pressure into an electric signal, then the electric signal is amplified by an amplifying circuit and compensated by a compensating circuit, and finally the electric signal is output in a 4-20 mA or 0-10 mA current mode. The float-type liquid level sensor measures the liquid level, the boundary level or the density of liquid by utilizing a tiny metal film strain sensing technology, can carry out conventional setting operation by using a field key during working, and is not suitable for application scenes. The temperature sensor can adopt a contact temperature sensor or a non-contact sensor, and can adopt a contact temperature sensor, so that the detection cost is reduced; the temperature sensor comprises a detection part and a mounting part, the mounting part of the temperature sensor is fixedly mounted on the inner side surface of the urea solution tank, and the detection part of the temperature sensor is soaked in the urea solution.
The automobile urea concentration detection system based on ultrasonic waves further comprises a microprocessor, wherein a first information receiving end of the microprocessor is connected with the ultrasonic sensor, a second information receiving end is connected with the liquid level sensor, a third information receiving end is connected with the temperature sensor, a power supply end is connected with a power supply end of the PC console, and a communication end is connected with a communication end of the PC console.
The automobile urea concentration detection system based on ultrasonic waves further comprises a data acquisition card, wherein the data acquisition card is connected between the microprocessor and the PC console, one end of the data acquisition card is connected with the communication end of the microprocessor, and the other end of the data acquisition card is connected with the communication end of the PC console; and the power supply end of the microprocessor is connected with the power supply end of the PC console through the USB interface.
In the automobile urea concentration detection system based on ultrasonic waves, a liquid discharge port is formed in the bottom of the urea solution tank and used for discharging waste liquid after detection is finished; and a liquid discharge pipe is connected at the liquid discharge port, and waste liquid is discharged out of the temperature adjustable box through the liquid discharge pipe. The liquid discharge valve is arranged on the liquid discharge pipe and used for controlling the opening and closing of the liquid discharge pipe, and the liquid discharge valve is connected with the sixth control end of the PC console.
Above-mentioned car urea concentration detecting system based on ultrasonic wave, urea granule filling machine includes urea granule receiver, electron balance and filling equipment, the first control end of filling equipment and PC control cabinet is connected, filling equipment includes first catch arm and second catch arm, and first catch arm is used for promoting urea granule from urea granule receiver to electronic balance, and the second catch arm is used for promoting urea granule from electronic balance to the feed inlet of filling equipment, and the discharge gate and the urea solution jar of filling equipment communicate.
In the automobile urea concentration detection system based on ultrasonic waves, a circle of heat preservation asbestos is arranged on the inner side wall of the temperature adjustable box; specifically, the heat-insulating asbestos can be replaced by heat-insulating foam and the like, so that the dissipation of the temperature-adjustable box can be reduced, and the electric energy is saved.
The working principle of the automobile urea concentration detection system based on ultrasonic waves is as follows:
and controlling the urea solution filling machine to start through the PC console, filling a certain amount of urea solution into the urea solution tank, recording the initial urea solution concentration and the filling amount, storing the urea solution in the PC console, and controlling the urea solution filling machine to close through the PC console after filling is finished.
The temperature adjustable box is controlled to be started through the PC console, the temperature adjustable box is adjusted to a preset temperature, the preset temperature can be a temperature interval, and the temperature is maintained; the urea solution tank is placed inside a temperature-regulated tank, so as to maintain the temperature inside the urea solution tank within this temperature interval, for example as follows:
| temperature (degree) | -30 | -20 | -10 | 0 | 10 | 20 | 30 |
| Run time (minutes) | 60 | 60 | 60 | 60 | 60 | 60 | 60 |
The method comprises the following steps that an ultrasonic sensor detects the flight time of ultrasonic waves in a urea solution in a tank in real time, a liquid level sensor detects liquid level information in the urea solution tank in real time, and a temperature sensor detects temperature information in the urea solution tank in real time; the detected flight time, liquid level information and temperature information of the ultrasonic waves are transmitted to a microprocessor; the microprocessor transmits the acquired data information to the PC console in real time through the data acquisition card. And calling a secondary function of the data acquisition card through Labview to store the data in real time.
The PC console comprises a data analysis and calculation module, and can calculate the concentration of the urea solution in real time according to the temperature and the flight time of the ultrasonic waves. Analyzing and comparing the concentration of the real-time urea solution with that of the standard urea solution, controlling the temperature adjustable box to adjust the temperature through the PC console if the concentration of the real-time urea solution is the same as that of the standard urea solution, and acquiring ultrasonic data again for analysis and calculation; if the concentration of the real-time urea solution is greater than that of the standard urea solution, the PC console controls the purified water filling machine to start, a certain amount of purified water is filled into the urea solution tank, the filling amount is recorded, data is stored in the PC console, and after filling is finished, the PC console controls the purified water filling machine to close; and if the real-time urea solution concentration is smaller than the standard urea solution concentration, the PC console controls the urea particle filling machine to start, a certain amount of urea particles are filled into the urea solution tank, the filling amount is recorded, data is stored in the PC console, and after the filling is finished, the PC console controls the urea particle filling machine to close.
The PC console comprises a data judgment module which can judge whether the real-time liquid level in the urea solution tank exceeds the preset highest liquid level, if so, the PC console controls the metering drain valve to be opened, a certain amount of urea solution is drained, the drain amount is recorded, data is stored in the PC console, and after the liquid drainage is finished, the metering drain valve is controlled to be closed through the PC console; and judging whether the real-time liquid level in the urea solution tank exceeds a preset minimum liquid level or not, if so, controlling the urea solution filling machine to start by the PC console, filling a certain amount of urea solution into the urea solution tank, recording the filling amount, storing the urea solution in the PC console, and controlling the urea solution filling machine to close by the PC console after filling is finished.
The data judgment module can judge whether the real-time temperature in the urea solution tank exceeds a preset maximum temperature, if so, the PC console controls the temperature adjustable box to start, lower the temperature and record temperature adjustment data, the data is stored in the PC console, and after the temperature is adjusted, the PC console controls the temperature adjustable box to close; whether the real-time temperature in the urea solution tank exceeds the preset minimum temperature or not can be judged, if yes, the temperature adjustable box is started and is adjusted to be high through the PC console, temperature adjustment data are recorded, the data are stored in the PC console, and after the temperature is adjusted, the temperature adjustable box is closed through the PC console.
After the purified water or the particles are filled, the PC console controls the micro oil-well pump to be started, the solution in the urea solution tank is uniformly mixed, and after the solution is mixed, the PC console controls the micro oil-well pump to be closed; the starting time of the micro oil well pump is generally 30-60 seconds.
In the automobile urea concentration detection system based on ultrasonic waves, the urea particle filling process is as follows:
the PC console issues a control signal to the urea particle filling machine, the filling equipment controls the first pushing arm to push the urea particles from the urea particle storage box to the electronic balance, and weighing information of the urea particles is recorded and sent to the PC console; after weighing is finished, the filling equipment controls the second pushing arm to push urea particles from the electronic balance to a feeding hole of the filling equipment, and a discharging hole of the filling equipment fills the urea particles into the urea solution tank. When the urea particle pushing device is specifically implemented, the first pushing arm can adopt a telescopic rod, the amount of pushed urea particles is adjusted by adjusting the length of the telescopic rod, and the telescopic amount of the first pushing arm is controlled by a PC (personal computer) console; or the urea particle storage box comprises a plurality of small storage boxes with the same specification, the first pushing arm pushes the urea particles in one small storage box to the electronic balance for weighing at a time, and the amount of each small storage box is the same.
Referring to fig. 6 to 10, fig. 6 is raw data stored in real time, which includes a temperature data set of the temperature-adjustable tank, a solution temperature in the urea solution tank, a flight speed of ultrasonic waves output by the PBCA version, a calculated urea solution concentration, a flight time of ultrasonic waves output by the PBCA version, and recording time information, and the temperature of the temperature-adjustable tank is continuously adjusted, so that the urea solution in the urea solution tank has different urea solution concentrations at different temperatures. For the convenience of calculation and analysis of data, the raw data can be converted into decimal, and fig. 7 is a time relation graph of the urea solution in the urea solution tank along with the temperature change, wherein the urea solution concentration adopts a standard concentration, namely 32.5%, and represents the relation of the ultrasonic flight time and the flight speed at each temperature. FIG. 8 is a graph showing the relationship between the flight speed of ultrasonic waves and the temperature of the urea solution. FIG. 9 is a graph of the relationship between the standard urea solution temperature and the ultrasonic flight speed and other parameters, wherein the gray line 1 represents the ultrasonic flight speed curve in m/s, the gray line 2 represents the ultrasonic flight time curve in microseconds, and the black line represents the urea solution concentration. Fig. 7 to 9 can be obtained for each urea solution concentration. Therefore, the concentration of the urea solution can be obtained by looking up a table through a background table only by the flight time or the flight speed and the temperature of the ultrasonic wave. FIG. 10 is monitoring software developed by my company for monitoring and displaying the concentration, temperature and Level of a urea solution, Tem for temperature 1, Tem1 for temperature 2, Con for urea solution concentration and Level for Level. By recording the time of flight and the speed of flight for each concentration and writing the data into the software, and using Labview software for analysis, the calculated concentration error was within 1%.
According to the automobile urea concentration detection system based on ultrasonic waves, the flight time of the ultrasonic waves in the urea solution is detected by the ultrasonic sensor, the real-time urea solution concentration is calculated according to the temperature and the ultrasonic flight time, the detection mode is simple and convenient, and the corresponding urea solution concentration at the temperature can be quickly obtained by looking up the table at the later stage; meanwhile, the liquid level sensor can be used for detecting liquid level information in the urea solution tank in real time, the temperature sensor is used for detecting temperature information in the urea solution tank in real time, the concentration of the urea solution at different temperatures can be effectively detected, and the device has the advantages of high accuracy of urea solution concentration detection data, simple and convenient detection mode, good real-time performance and the like.
Example two:
referring to fig. 2, an automobile urea concentration detection method based on ultrasonic waves includes the following steps:
s11: filling a urea solution into the urea solution tank through a urea solution filling machine, and recording the initial concentration of the urea solution; specifically, the urea solution in the urea solution filling machine is prepared in advance, and the concentration of the urea solution can be set in advance according to requirements; because the characteristic that urea itself volatilizes easily, the solution of urea solution filling machine the inside needs the periodic replacement to guarantee that urea solution concentration is in the error range that volatilizees, guarantee the accuracy that urea concentration detected in the urea solution jar.
S12: adjusting the temperature in the urea solution tank to a preset temperature through a temperature adjustable tank and maintaining the temperature, detecting the flight time of ultrasonic waves in the urea solution by using an ultrasonic sensor, and calculating the concentration of the urea solution in real time according to the preset temperature and the flight time of the ultrasonic waves; specifically, the temperature adjusting range of the temperature adjustable box is between-50 ℃ and +100 ℃. Ultrasonic emitter and ultrasonic receiver install on same water flat line, and ultrasonic emitter and ultrasonic receiver's mounted position is in minimum preset liquid level below at urea solution tank inside wall the latter half, can avoid the solution liquid level to cross when low and do not influence ultrasonic sensor's detection like this, guarantees to detect the accuracy.
S13: comparing the concentration of the real-time urea solution with that of the standard urea solution, and executing the step S14 if the concentration of the real-time urea solution is the same as that of the standard urea solution; if the concentration of the real-time urea solution is greater than the concentration of the standard urea solution, a preset amount of purified water is filled into the urea solution tank through the purified water filling machine, and the step S12 is executed again; and if the real-time urea solution concentration is smaller than the standard urea solution concentration, filling a preset amount of urea particles into the urea solution tank through a urea particle filling machine, and returning to execute the step S12. Specifically, the diameter of the urea particles ranges from 0.5mm to 2mm, and the diameter of the urea particles is preferably 1 mm; urea powder can be adopted, so that the urea powder is conveniently and quickly dissolved into the solution; the small urea particles and the powder are convenient and accurate to calculate the weight, and the concentration detection precision of the urea solution is improved. The purified water can be replaced by common tap water, so that the cost is reduced; the concentration detection precision of the urea solution can be improved by optimizing distilled water, and meanwhile, the impurity content in the solution can be reduced, so that the automobile exhaust discharge pipe is prevented from being blocked due to excessive impurities.
S14: adjusting the preset temperature, and cycling through steps S12 and S13 for a preset number of times.
S15: and (3) Labview software is adopted to store the detection data in real time, and the curve relation of the concentration of the urea solution, the ultrasonic flight time and the temperature is analyzed.
Referring to fig. 3, the method for detecting the real-time liquid level in the urea solution tank by using the liquid level sensor comprises the following steps:
s21: detecting liquid level information in the urea solution tank in real time through a liquid level sensor, and sending the detected liquid level information to a PC console through a microprocessor;
s22: judging whether the real-time liquid level in the urea solution tank exceeds the preset highest liquid level or not according to the liquid level information, if so, controlling a metering drain valve to be opened through a PC (personal computer) console, and returning to execute the step S21; if not, go to step S23;
s23: judging whether the real-time liquid level in the urea solution tank exceeds a preset minimum liquid level, if so, filling the urea solution into the urea solution tank through a urea solution filling machine, and returning to execute the step S21; if not, the process returns to step S21.
Referring to fig. 4, the method for detecting the real-time temperature in the urea solution tank by using the temperature sensor comprises the following steps:
s31: detecting temperature information in the urea solution tank in real time through a temperature sensor, and sending the detected temperature information to a PC console through a microprocessor;
s32: judging whether the real-time temperature in the urea solution tank exceeds a preset maximum temperature or not according to the temperature information, if so, controlling the temperature adjustable box to lower through the PC console, and returning to execute the step S31; if not, go to step S33;
s33: judging whether the real-time temperature in the urea solution tank exceeds a preset minimum temperature, if so, controlling the temperature adjustable box to increase the temperature through the PC console, and returning to execute the step S31; if not, the process returns to step S31.
Referring to fig. 5, the method for detecting the concentration of the urea solution in the urea solution tank by using the ultrasonic sensor comprises the following steps:
s41: detecting the flight time of ultrasonic waves in the urea solution in real time through an ultrasonic sensor, and calculating the concentration of the urea solution in real time according to the real-time temperature and the flight time of the ultrasonic waves;
s42: comparing the concentration of the real-time urea solution with that of the standard urea solution, and executing the step S41 if the concentration of the real-time urea solution is the same as that of the standard urea solution; if the concentration of the real-time urea solution is greater than that of the standard urea solution, filling a preset amount of purified water into the urea solution tank through a purified water filling machine, and executing step S44; if the real-time urea solution concentration is smaller than the standard urea solution concentration, executing step S43;
s43: the filling equipment controls the first pushing arm to push the urea particles from the urea particle storage box to the electronic balance, records the weighing information of the urea particles and sends the weighing information to the PC console; after weighing is finished, the filling equipment controls the second pushing arm to push urea particles from the electronic balance to a feeding hole of the filling equipment, and a discharging hole of the filling equipment fills the urea particles into the urea solution tank;
s44: the solution in the urea solution tank is uniformly stirred by controlling the micro oil-well pump through the PC console, and the step S41 is executed again.
Referring to fig. 6 to 10, fig. 6 is raw data stored in real time, which includes a temperature data set of the temperature-adjustable tank, a solution temperature in the urea solution tank, a flight speed of ultrasonic waves output by the PBCA version, a calculated urea solution concentration, a flight time of ultrasonic waves output by the PBCA version, and recording time information, and the temperature of the temperature-adjustable tank is continuously adjusted, so that the urea solution in the urea solution tank has different urea solution concentrations at different temperatures. For the convenience of calculation and analysis of data, the raw data can be converted into decimal, and fig. 7 is a time relation graph of the urea solution in the urea solution tank along with the temperature change, wherein the urea solution concentration adopts a standard concentration, namely 32.5%, and represents the relation of the ultrasonic flight time and the flight speed at each temperature. FIG. 8 is a graph showing the relationship between the flight speed of ultrasonic waves and the temperature of the urea solution. FIG. 9 is a graph of the relationship between the standard urea solution temperature and the ultrasonic flight speed and other parameters, wherein the gray line 1 represents the ultrasonic flight speed curve in m/s, the gray line 2 represents the ultrasonic flight time curve in microseconds, and the black line represents the urea solution concentration. Fig. 7 to 9 can be obtained for each urea solution concentration. Therefore, the concentration of the urea solution can be obtained by looking up a table through a background table only by the flight time or the flight speed and the temperature of the ultrasonic wave. FIG. 10 is monitoring software developed by my company for monitoring and displaying the concentration, temperature and Level of a urea solution, Tem for temperature 1, Tem1 for temperature 2, Con for urea solution concentration and Level for Level. By recording the time of flight and the speed of flight for each concentration and writing the data into the software, and using Labview software for analysis, the calculated concentration error was within 1%.
In specific implementation, when the temperature is lower than about-5 ℃, the urea solution can be iced seriously, and at the moment, the urea solution can be difficult to spray into the tail gas and the spraying system can be damaged. At this time, the urea solution concentration is required to be increased through software elevation to enable the tail gas purification system to reduce the urea spraying, then circulating hot water is introduced to enable the urea solution to be slowly melted into liquid, and then the urea solution concentration is slowly recovered.
According to the automobile urea concentration detection method based on ultrasonic waves, the flight time of the ultrasonic waves in the urea solution is detected by the ultrasonic sensor, the real-time urea solution concentration is calculated according to the temperature and the ultrasonic flight time, the detection mode is simple and convenient, and the corresponding urea solution concentration at the temperature can be quickly obtained by looking up the table at the later stage; meanwhile, the liquid level sensor can be used for detecting liquid level information in the urea solution tank in real time, the temperature sensor is used for detecting temperature information in the urea solution tank in real time, the concentration of the urea solution at different temperatures can be effectively detected, and the device has the advantages of high accuracy of urea solution concentration detection data, simple and convenient detection mode, good real-time performance and the like.
Finally, it is noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the protection scope of the present invention.
Claims (10)
1. An automobile urea concentration detection system based on ultrasonic waves is characterized by comprising:
the urea solution tank is used for preparing, detecting and storing urea solution;
the urea particle filling machine is communicated with the first filling port of the urea solution tank body and is used for filling urea particles into the urea solution tank;
the purified water filling machine is communicated with a second filling port of the urea solution tank body and is used for filling purified water into the urea solution tank;
the urea solution filling machine is communicated with a third filling port of the urea solution tank body and is used for filling urea solution with preset concentration into the urea solution tank;
a temperature-tunable tank, the urea solution tank being disposed within the temperature-tunable tank;
the ultrasonic sensor comprises an ultrasonic transmitter and an ultrasonic receiver, wherein the ultrasonic transmitter and the ultrasonic receiver are respectively and oppositely arranged on the inner side wall of the urea solution tank.
2. The urea concentration detection system as claimed in claim 1, further comprising a PC console, wherein the first control end of the PC console is connected to the urea particle filling machine for controlling the filling amount of urea particles; the second control end is connected with the purified water filling machine and is used for controlling the filling amount of the purified water; the third control end is connected with the urea solution filling machine and used for controlling the filling amount of the urea solution; the fourth control end is connected with the temperature adjustable box and used for adjusting the temperature inside the temperature adjustable box.
3. The urea concentration detecting system according to claim 2, further comprising a micro oil pump fixedly installed at a middle position of a bottom of the urea solution tank, the micro oil pump being connected to a fifth control end of the PC console for uniformly stirring the solution in the urea solution tank.
4. The urea concentration detection system according to claim 3, further comprising a liquid level sensor and a temperature sensor, wherein the liquid level sensor is vertically and fixedly installed on the inner side wall of the urea solution tank and is used for detecting the liquid level of the solution in the urea solution tank in real time; the temperature sensor is arranged in the middle of the inner side wall of the urea solution tank and used for detecting the temperature in the urea solution tank in real time.
5. The urea concentration detecting system according to claim 4, further comprising a microprocessor, wherein a first information receiving terminal of the microprocessor is connected to the ultrasonic sensor, a second information receiving terminal of the microprocessor is connected to the liquid level sensor, a third information receiving terminal of the microprocessor is connected to the temperature sensor, a power supply terminal of the microprocessor is connected to a power supply terminal of the PC console, and a communication terminal of the microprocessor is connected to a communication terminal of the PC console.
6. The urea concentration detection system according to claim 5, further comprising a data acquisition card, wherein the data acquisition card is connected between the microprocessor and the PC console, one end of the data acquisition card is connected with the communication end of the microprocessor, and the other end of the data acquisition card is connected with the communication end of the PC console; and the power supply end of the microprocessor is connected with the power supply end of the PC console through the USB interface.
7. The urea concentration detection system according to claim 6, wherein a liquid discharge port is provided at the bottom of the urea solution tank for discharging waste liquid after detection; and a liquid discharge pipe is connected at the liquid discharge port, and waste liquid is discharged out of the temperature adjustable box through the liquid discharge pipe.
8. The urea concentration detection system according to claim 7, further comprising a metering drain valve mounted on the drain pipe for controlling the opening and closing of the drain pipe, wherein the drain valve is connected to a sixth control end of the PC console.
9. The urea concentration detection system of claim 8, wherein the urea particle filling machine comprises a urea particle storage box, an electronic balance and a filling device, the filling device is connected with the first control end of the PC console, the filling device comprises a first pushing arm and a second pushing arm, the first pushing arm is used for pushing urea particles from the urea particle storage box to the electronic balance, the second pushing arm is used for pushing urea particles from the electronic balance to a feeding hole of the filling device, and a discharging hole of the filling device is communicated with the urea solution tank.
10. The urea concentration detection system according to any one of claims 1 to 9, wherein a ring of heat preservation asbestos is disposed on an inner side wall of the temperature-adjustable box.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111798938A (en) * | 2020-07-27 | 2020-10-20 | 科博达重庆汽车电子有限公司 | Automobile urea concentration detection system and detection method based on ultrasonic waves |
| CN113847129A (en) * | 2021-10-12 | 2021-12-28 | 安徽江淮汽车集团股份有限公司 | Vehicle-mounted urea solution index measuring system |
| CN116297825A (en) * | 2023-05-25 | 2023-06-23 | 湖北工业大学 | Urea concentration detection method, device, electronic equipment and storage medium |
-
2020
- 2020-07-27 CN CN202021503489.1U patent/CN212411587U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111798938A (en) * | 2020-07-27 | 2020-10-20 | 科博达重庆汽车电子有限公司 | Automobile urea concentration detection system and detection method based on ultrasonic waves |
| CN113847129A (en) * | 2021-10-12 | 2021-12-28 | 安徽江淮汽车集团股份有限公司 | Vehicle-mounted urea solution index measuring system |
| CN116297825A (en) * | 2023-05-25 | 2023-06-23 | 湖北工业大学 | Urea concentration detection method, device, electronic equipment and storage medium |
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