CN220015313U - Concentration liquid level detection device, system and tail gas aftertreatment system - Google Patents
Concentration liquid level detection device, system and tail gas aftertreatment system Download PDFInfo
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- CN220015313U CN220015313U CN202321778349.9U CN202321778349U CN220015313U CN 220015313 U CN220015313 U CN 220015313U CN 202321778349 U CN202321778349 U CN 202321778349U CN 220015313 U CN220015313 U CN 220015313U
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- 238000001514 detection method Methods 0.000 title claims abstract description 135
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 18
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
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Abstract
The utility model discloses a concentration liquid level detection device, a concentration liquid level detection system and a tail gas aftertreatment system, wherein the device comprises a power supply conversion unit, a controller local area network communication unit, a control unit, a concentration detection unit and a liquid level detection unit, wherein the power supply conversion unit provides voltage required by the device; the controller area network communication unit is used for data transmission between the control unit and an external ECU controller; the control unit receives information of the ECU controller and sends a first control instruction and a second control instruction; the concentration detection unit obtains first measurement data by executing a first control instruction, processes the first measurement data and sends the first measurement data to the control unit; the liquid level detection unit obtains second measurement data by executing a second control instruction, processes the second measurement data and sends the second measurement data to the control unit; the control unit calculates the concentration value and the liquid level value of the solution to be detected according to a preset program, and sends response information to the ECU controller. By replacing the application specific integrated chip, the cost is lower, the design flexibility is higher, and the function expandability is better.
Description
Technical Field
The utility model relates to the technical field of diesel engine aftertreatment systems, in particular to a concentration liquid level detection device, a concentration liquid level detection system and a tail gas aftertreatment system.
Background
In general, the diesel engine can generate harmful gases polluting the atmosphere, and the urea metering pump control system can reduce the harmful gases discharged into the atmosphere. The diesel SCR tail gas aftertreatment is to effectively control emissions such as carbon monoxide (CO), hydrocarbon (HC) and Particles (PM) in the exhaust gas and meet the requirements of regulations, and finally to reuse a special vehicle-mounted aftertreatment system for treating Nitrogen Oxides (NOX) with higher content in the exhaust gas discharged from an engine. The basic working principle is that Nitrogen Oxides (NOX) with higher content in the exhaust gas of the engine are treated by a special vehicle-mounted aftertreatment system so as to meet the requirement of regulations.
Currently, the mainstream aftertreatment technology in the diesel market is a diesel selective catalytic reduction (Selective CatalyticReduction, SCR) technology, which uses urea solution as a reducing agent to remove nitrogen oxides in diesel engine emissions. The SCR technology calculates the actual injection amount of the urea solution from the concentration of the urea solution, and thus, it is important to monitor the concentration and the liquid level of the urea solution in real time during the post-treatment.
Disclosure of Invention
The technical scheme of the utility model is realized as follows:
in a first aspect, an embodiment of the present utility model provides a concentration liquid level detection apparatus, including a power conversion unit, a CAN communication unit, a control unit, a concentration detection unit, and a liquid level detection unit, where,
the power supply conversion unit is configured to convert an external power supply into voltages required by the CAN communication unit, the control unit, the concentration detection unit and the liquid level detection unit;
the CAN communication unit is configured to transmit data between the control unit and an external ECU controller;
the control unit is configured to receive information of the ECU controller, and correspondingly send a first control instruction and a second control instruction to the concentration detection unit and the liquid level detection unit according to a set program respectively;
the concentration detection unit is configured to drive a concentration sensor outside the device to start measurement on a solution to be detected by executing the first control instruction, receive first measurement data obtained by measurement of the concentration sensor, process the first measurement data and send the first measurement data to the control unit;
the liquid level detection unit is configured to drive a liquid level sensor outside the device to start measurement on the solution to be detected by executing the second control instruction, receive second measurement data obtained by measuring the liquid level sensor, process the second measurement data and send the second measurement data to the control unit;
the control unit is further configured to process the received first measurement data and second measurement data according to a preset program, obtain a concentration value and a liquid level value of the solution to be detected, and send response information to the ECU controller according to the first control instruction and the second control instruction.
In some possible implementations, the power conversion unit may generate the corresponding voltage using a switching regulator.
In some possible implementations, the power conversion unit may generate the corresponding voltage using a linear voltage regulator.
In some of the possible implementations of the present utility model,
the concentration sensor comprises an ultrasonic probe, and correspondingly, the concentration detection unit comprises a voltage boosting circuit, an exciting circuit and a first detection circuit, wherein,
the boost circuit is configured to generate a driving voltage according to a third control signal in the first control signals, wherein the driving voltage is a voltage capable of driving the ultrasonic probe;
the excitation circuit is configured to generate a signal with a specific waveform according to a fourth control signal in the first control signals and the driving voltage, and the frequency and the duty ratio of the signal meet the requirement of driving the ultrasonic probe to emit ultrasonic waves;
the first detection circuit is configured to amplify and filter an echo signal of the ultrasonic wave and then send the echo signal to the control unit; wherein the first measurement data comprises the echo signal.
In some examples, the boost circuit is configured to include a generic boost chip.
In some examples, the boost circuit is configured as a bootstrap circuit comprising a diode and a capacitor.
In some examples, the concentration sensor further comprises a first temperature probe, and correspondingly, the concentration detection unit further comprises a second detection circuit, wherein,
the second detection circuit is configured to drive a first temperature probe to measure a temperature value of the ultrasonic probe as a first temperature value, receive the first temperature value, process the first temperature value and send the first temperature value to the control unit, wherein the first measurement data further comprises the first temperature value;
the control unit is further configured to calculate a propagation time of the ultrasonic wave in the solution to be detected according to the time of transmitting the ultrasonic wave and the time of receiving the echo, and calculate a concentration of the solution to be detected according to the propagation time and the first temperature value.
In some of the possible implementations of the present utility model,
the liquid level sensor comprises a second temperature probe and a liquid level probe, and correspondingly, the liquid level detection unit comprises a third detection circuit and a fourth detection circuit, wherein,
the third detection circuit is configured to drive a second temperature probe to measure a second temperature value, receive the second temperature value, process the second temperature value and then send the second temperature value to the control unit, wherein the second measurement data comprises the second temperature value;
the fourth detection circuit is configured to drive the liquid level probe to measure and obtain liquid level data, and send the liquid level data to the control unit after processing, wherein the second measurement data comprises the liquid level data.
In a second aspect, an embodiment of the present utility model provides a concentration liquid level detection system, where the system includes the concentration liquid level detection apparatus of the first aspect, an ECU controller, and a concentration liquid level sensor.
In a third aspect, an embodiment of the present utility model provides an exhaust gas aftertreatment system applied to a diesel engine, where the system includes a concentration liquid level detection system according to the second aspect, where the concentration liquid level detection system is configured to detect a concentration and a liquid level of a urea solution.
The concentration detection unit and the liquid level detection unit replace a sensor driving function of an application specific integrated chip, and the ECU control unit bears the processing of sensor measurement data, so that the cost of the solution quality measurement equipment is reduced, and fault devices can be replaced flexibly with low cost. The concentration detection unit and the liquid level detection unit can respectively adopt mutually independent technical schemes, so that the design flexibility is higher, and the function expandability is better.
Drawings
FIG. 1 is a schematic diagram of a urea solution concentration and level detection device in the prior art.
Fig. 2 is a schematic diagram 1 of a concentration liquid level detection system according to an embodiment of the present utility model.
Fig. 3 is a schematic diagram 2 of a concentration liquid level detection system according to an embodiment of the present utility model.
Detailed Description
The terms "first", "second" in embodiments of the utility model are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The method for detecting the concentration of the urea solution generally adopts an ultrasonic signal detection technology, according to the characteristics of different propagation speeds of ultrasonic waves in liquids with different concentrations, ultrasonic signals with specific frequencies are emitted, the ultrasonic signals bounce back after encountering a reflecting polar plate, and the concentration of the urea solution is calculated through the time difference between the emission and the echo. The existing concentration and liquid level detection system for urea solution generally adopts a detection system shown in fig. 1, an ultrasonic special chip unit drives a concentration sensor and a liquid level sensor to measure, an ultrasonic echo signal received by the sensor is processed in the ultrasonic special chip unit to obtain a concentration value and a liquid level value of the solution, and the concentration value and the liquid level value are sent to a MCU (Microcontroller Unit) control unit. The proposal uses an application specific integrated chip for processing the ultrasonic signals, but has the problems of high cost, low flexibility and poor device replaceability, and is not beneficial to the expandability design of functions. The present utility model provides a concentration liquid level detection system 2 as shown in fig. 2, comprising an ECU (ElectronicControl Unit ) controller 10, a concentration liquid level detection device 20 and a concentration liquid level sensor 30, wherein the concentration liquid level detection device 20 comprises a power conversion unit 201, a controller area network communication unit 202, a control unit 203, a concentration detection unit 204, a liquid level detection unit 205, wherein,
the power conversion unit 201 is configured to convert an external power source into voltages required by the controller area network communication unit 202, the control unit 203, the concentration detection unit 204, and the liquid level detection unit 205;
the controller area network communication unit 202 is configured to transfer data between the control unit 203 and the external ECU controller 10;
the control unit 203 is configured to receive information of the ECU controller 10, and send a first control instruction and a second control instruction to the concentration detection unit 204 and the liquid level detection unit 205, respectively, according to a set program;
the concentration detection unit 204 is configured to drive the concentration sensor 301 outside the device to start measurement of the solution to be detected by executing the first control instruction, receive the first measurement data obtained by the measurement of the concentration sensor 301, process the first measurement data, and send the first measurement data to the control unit 203;
the liquid level detection unit 205 is configured to drive a liquid level sensor 302 located outside the device to start measurement on the solution to be detected by executing the second control instruction, receive second measurement data obtained by measurement of the liquid level sensor 302, process the second measurement data, and send the second measurement data to the control unit 203;
the control unit 203 is further configured to process the received first measurement data and second measurement data according to a preset program, obtain a concentration value and a liquid level value of the solution to be detected, and send response information to the ECU controller 10 according to the first control command and the second control command.
In the apparatus 20 shown in fig. 2, the concentration sensor 301 and the liquid level sensor 302 are driven by the concentration detection unit 204 and the liquid level detection unit 205, respectively, to obtain measurement data, and the concentration value and the liquid level value are obtained by processing the measurement data by the ECU controller 10. The concentration detection unit 204 and the liquid level detection unit 205 replace the sensor driving function of the special integrated chip, the control unit 203 bears the processing of sensor measurement data, and the ECU controller receives the data processed by the MCU control unit through the CAN communication unit, so that the cost of the solution quality measurement equipment is reduced, and fault devices CAN be replaced flexibly with low cost. The concentration detection unit 204 and the liquid level detection unit 205 can respectively adopt mutually independent technical schemes, so that the design flexibility is higher, and the function expandability is better.
Specifically, the external ECU controller 10 may be an engine controller or other controllers. The engine controller is an electronic device for controlling the operation of various parts of the internal combustion engine, monitors various input data (such as braking, gear shifting and the like) and various running states (acceleration, slipping, fuel consumption and the like) of the automobile at any time, calculates information sent by various sensors according to a pre-designed program, sends various parameters to various related execution mechanisms after processing, and executes various preset control functions such as ignition and fuel injection control, light control, air bag control, fuel heating control, exhaust control, braking control and the like of the engine. In the scheme, the engine controller can trigger the concentration liquid level detection device to start reporting based on the ignition state of the engine, and the content, the reporting frequency and the like of the reporting information of the concentration liquid level detection device are requested or controlled based on the state of the engine.
The controller area network (Controller Area Network, CAN) communication unit 202 is used for information transfer between the ECU controller 10 and the concentration liquid level detection apparatus 20. CAN is a serial communication protocol bus for real-time applications that may use twisted pair wires to transmit signals, and may also use optical cable connections.
The control unit 203 in the concentration level detection apparatus 20 may be a micro control unit. The MCU mainly comprises a CPU (comprising an arithmetic unit, a controller and a register group), a memory (comprising ROM and RAM), an input/output I/O interface, a timer, an interrupt system, a special register and the like. In this scheme, for example, when the engine is started, the ECU controller 10 sends engine starting state information to the control unit 203 through the CAN communication unit 202, and/or sends request information such as the current urea solution concentration or the liquid level query, and the control unit 203 performs corresponding processing after receiving the engine starting information, and the control unit 203 performs processing by executing a preset program, obtains measurement data through the concentration detection unit 204 or the liquid level detection unit 205, and transmits response information and data to the ECU controller 10 through the CAN communication unit 202 after processing the preset program.
The external power supply may be a power supply module of the ECU controller 10, or may be another power supply module. The power conversion unit 201 receives power from an external power source, and supplies power to the hardware circuits of the concentration level detection apparatus 20 with multiple voltages.
For the concentration level detection apparatus 20 shown in fig. 2, in some possible implementations, the power conversion unit 201 may generate a corresponding voltage using a switching regulator.
For the concentration level detection apparatus 20 shown in fig. 2, in some possible implementations, the power conversion unit 201 may use a linear regulator to generate the corresponding voltage.
For the concentration level detection apparatus 20 shown in fig. 2, in some possible implementations,
the concentration sensor 301 includes an ultrasonic probe, and correspondingly, the concentration detection unit 204 includes a booster circuit, an excitation circuit, a first detection circuit, wherein,
the boost circuit is configured to generate a driving voltage according to a third control signal in the first control signals, wherein the driving voltage is a voltage capable of driving the ultrasonic probe;
the excitation circuit is configured to generate a signal with a specific waveform according to a fourth control signal in the first control signals and the driving voltage, and the frequency and the duty ratio of the signal meet the requirement of driving the ultrasonic probe to emit ultrasonic waves;
the first detection circuit is configured to amplify and filter the echo signal of the ultrasonic wave and send the amplified echo signal to the control unit 203; wherein the first measurement data comprises the echo signal.
The control signal output by the control unit 203 may be a PWM square wave signal, and the propagation density of the emitted wave of the ultrasonic wave may be controlled by the control signal. The booster circuit 2401 generates a voltage required for ultrasonic transmission based on the control signal, and the excitation circuit drives the ultrasonic probe to transmit ultrasonic waves based on the booster circuit output voltage, and the control unit 203 records the time of transmitting ultrasonic waves or starts timing. The first detection circuit amplifies and filters the echo signal received by the ultrasonic probe, detects the echo signal of the ultrasonic wave, and sends the echo signal to the control unit 203. The control unit 203 records the time of receiving the echo signal or stops the timing to obtain the propagation time of the ultrasonic wave. The concentration value of the solution is calculated based on the difference of the propagation speeds of the ultrasonic wave in the solutions in different concentrations.
The wavelength of the ultrasonic sensor and other factors affect the accuracy of the ultrasonic sensor, with the most dominant influencing factor being the speed of sound waves as a function of temperature. In the case of the above-described embodiment,
the concentration sensor 301 further comprises a first temperature probe and, correspondingly, the concentration detection unit 204 further comprises a second detection circuit, wherein,
the second detection circuit is configured to drive a first temperature probe to measure a temperature value of the ultrasonic probe as a first temperature value, receive the first temperature value, process the first temperature value, and send the first temperature value to the control unit 203, wherein the first measurement data further includes the first temperature value;
the control unit 203 is further configured to calculate a propagation time of the ultrasonic wave in the solution to be detected based on the time of transmitting the ultrasonic wave and the time of receiving the echo, and calculate a concentration of the solution to be detected based on the propagation time and the first temperature value.
Specifically, in consideration of the influence of the ambient temperature on the ultrasonic propagation speed, the control unit 203 controls the second detection circuit, performs temperature measurement on the ultrasonic probe through the first temperature probe, and sends the temperature measurement value to the control unit 203. The control unit 203 performs correction based on the temperature measurement value to improve the measurement accuracy of the urea solution concentration.
The booster circuit in the above embodiment may be configured by a general-purpose booster chip, or may be configured by a bootstrap circuit including a diode and a capacitor.
For the concentration level detection apparatus 20 shown in fig. 3, in some possible implementations,
the liquid level sensor 302 includes a second temperature probe and a liquid level probe, and accordingly, the liquid level detection unit 205 includes a third detection circuit, a fourth detection circuit, wherein,
the third detection circuit is configured to drive a second temperature probe to measure a second temperature value, receive the second temperature value, process the second temperature value, and send the second temperature value to the control unit 203, where the second measurement data includes the second temperature value;
the fourth detection circuit is configured to drive the liquid level probe to measure and obtain liquid level data, and send the liquid level data to the control unit 203 after processing, where the second measurement data includes the liquid level data.
The urea solution temperature value measured by the third detection circuit may be used as a basis for determining the current urea solution temperature by the ECU controller 10, and may be transmitted to the ECU controller 10 through the CAN communication unit 202. The control unit 203 may transmit the corrected temperature value calculated by a specific algorithm based on the first temperature value and the second temperature value to the ECU controller 10. The liquid level data obtained by the fourth detection circuit is transmitted to the ECU controller 10 as the stock of urea solution.
The concentration value, the first temperature value, the second temperature value, and the liquid level value measured by the above-mentioned sensor may be transmitted to the ECU controller 10 or used as a basis for the urea solution injection metering or alarm system, and may be measured once, or may be processed multiple times, or may be processed by the control unit 203 through a specific program, or may be processed by the ECU controller 10.
Corresponding to the above-described device embodiments, the present utility model also provides a concentration liquid level detection system including the concentration liquid level detection device 20, the ECU controller 10, and the concentration liquid level sensor 30 of the above-described embodiments.
The concentration liquid level sensor 30 includes a liquid level sensor 301 therein corresponding to the concentration detection unit 204 in the concentration liquid level detection apparatus 20;
the liquid level sensor 302 is included in the concentration liquid level sensor 30 corresponding to the liquid level detection unit 205 in the concentration liquid level detection apparatus 20.
Based on the above description, an embodiment of the connection relation of the parts in the concentration level detection system of urea solution, which includes the concentration level detection apparatus 20, the ECU controller 10 and the concentration level sensor 30, is exemplarily described, wherein,
the concentration liquid level detection device 20 comprises a power supply conversion unit 201, a CAN communication unit 202, a control unit 203, a concentration detection unit 204 and a liquid level detection unit 205, wherein the concentration detection unit 204 comprises a booster circuit 2041, an excitation circuit 2042, a first detection circuit 2043 and a second detection circuit 2044, and the liquid level detection unit 205 comprises a third detection circuit 2051 and a fourth detection circuit 2052;
the concentration liquid level sensor 30 comprises a concentration sensor 301 and a liquid level sensor 302, wherein the concentration sensor 301 comprises an ultrasonic probe 3011 and a first temperature probe 3012, and the liquid level sensor 302 comprises a second temperature probe 3021 and a liquid level probe 3022;
the first connection point of the power conversion unit 201 is connected with the first connection point of the ECU controller 10, the second connection point of the power conversion unit 201 is connected with the second connection point of the ECU controller 10, and the third connection point of the power conversion unit 201 is connected with the first connection point of the control unit 203;
the first connection point of the CAN communication unit 202 is connected with the third connection point of the ECU controller 10, the second connection point of the CAN communication unit 202 is connected with the fourth connection point of the ECU controller 10, the third connection point of the CAN communication unit 202 is connected with the second connection point of the control unit 203, the fourth connection point of the CAN communication unit 202 and the fourth connection point of the MCU control unit 203 are connected with the first connection point of the boost circuit 2041;
the second connection point of the booster circuit 2041 is connected to the second connection point of the excitation circuit 2042, the first connection point of the excitation circuit 2042 is connected to the fifth connection point of the control unit 203, and the third connection point of the excitation circuit 2042 is connected to the first connection point of the ultrasonic probe 3011 and the second connection point of the first detection circuit 2043, respectively;
the sixth connection point of the control unit 203 is connected to the first connection point of the first detection circuit 2043, the seventh connection point of the control unit 203 is connected to the first connection point of the second detection circuit 2044, and the second connection point of the second detection circuit 2044 is connected to the first connection point of the first temperature probe 3012;
the eighth connection point of the control unit 203 is connected to the first connection point of the third detection circuit 2051, and the second connection point of the third detection circuit 2051 is connected to the first connection point of the second temperature probe 3021;
the ninth connection point of the control unit 203 is connected to the first connection point of the fourth detection circuit 2052, and the second connection point of the fourth detection circuit 2052 is connected to the third connection point of the first connection point connection unit 203 of the liquid level probe 3022.
It should be further noted that the above-described apparatus embodiments are merely illustrative, where elements described as separate elements may or may not be physically separate, and elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the utility model, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines.
It should be noted that: the technical schemes described in the embodiments of the present utility model may be arbitrarily combined without any collision.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present utility model should be included in the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims (10)
1. A concentration liquid level detection device comprises a power supply conversion unit, a controller local area network communication unit, a control unit, a concentration detection unit and a liquid level detection unit, wherein,
the power supply conversion unit is configured to convert an external power supply into voltages required by the controller area network communication unit, the control unit, the concentration detection unit and the liquid level detection unit;
the controller area network communication unit is configured to transmit data between the control unit and an external ECU controller;
the control unit is configured to receive information of the ECU controller, and correspondingly send a first control instruction and a second control instruction to the concentration detection unit and the liquid level detection unit according to a set program respectively;
the concentration detection unit is configured to drive a concentration sensor outside the device to start measurement on a solution to be detected by executing the first control instruction, receive first measurement data obtained by measurement of the concentration sensor, process the first measurement data and send the first measurement data to the control unit;
the liquid level detection unit is configured to drive a liquid level sensor outside the device to start measurement on the solution to be detected by executing the second control instruction, receive second measurement data obtained by measuring the liquid level sensor, process the second measurement data and send the second measurement data to the control unit;
the control unit is further configured to process the received first measurement data and the second measurement data according to a preset program, obtain a concentration value and a liquid level value of the solution to be detected, and send response information to the ECU according to the information of the ECU.
2. The apparatus of claim 1, wherein the concentration sensor comprises an ultrasonic probe, and the concentration detection unit comprises a booster circuit, an excitation circuit, and a first detection circuit, respectively, wherein,
the boost circuit is configured to generate a driving voltage according to a third control signal in the first control instruction, wherein the driving voltage is a voltage capable of driving the ultrasonic probe;
the excitation circuit is configured to generate a signal with a specific waveform according to a fourth control signal in the first control instruction and the driving voltage, and the frequency and the duty ratio of the signal meet the requirement of driving the ultrasonic probe to emit ultrasonic waves;
the first detection circuit is configured to amplify and filter an echo signal of the ultrasonic wave and then send the echo signal to the control unit; wherein the first measurement data comprises the echo signal.
3. The apparatus of claim 2, wherein the concentration sensor further comprises a first temperature probe and, correspondingly, the concentration detection unit further comprises a second detection circuit, wherein,
the second detection circuit is configured to drive a first temperature probe to measure a temperature value of the ultrasonic probe as a first temperature value, receive the first temperature value, process the first temperature value and send the first temperature value to the control unit, wherein the first measurement data further comprises the first temperature value;
the control unit is further configured to calculate a propagation time of the ultrasonic wave in the solution to be detected according to the time of transmitting the ultrasonic wave and the time of receiving the echo, and calculate a concentration of the solution to be detected according to the propagation time and the first temperature value.
4. The apparatus of claim 2, wherein the boost circuit is configured to include a generic boost chip.
5. The apparatus of claim 2, wherein the boost circuit is configured to include a bootstrap circuit of diodes and capacitors.
6. The apparatus of claim 1, wherein the power conversion unit is configured to generate the corresponding voltage using a switching regulator.
7. The apparatus of claim 1, wherein the power conversion unit is configured to generate the corresponding voltage using a linear voltage regulator.
8. The apparatus of claim 1, wherein the liquid level sensor comprises a second temperature probe and a liquid level probe, and the liquid level detection unit comprises a third detection circuit and a fourth detection circuit, respectively, wherein,
the third detection circuit is configured to drive a second temperature probe to measure a second temperature value, receive the second temperature value, process the second temperature value and then send the second temperature value to the control unit, wherein the second measurement data comprises the second temperature value;
the fourth detection circuit is configured to drive the liquid level probe to measure and obtain liquid level data, and send the liquid level data to the control unit after processing, wherein the second measurement data comprises the liquid level data.
9. A concentration level detection system comprising the concentration level detection apparatus of any one of claims 1 to 8, an ECU controller, a concentration level sensor.
10. An exhaust gas aftertreatment system for a diesel engine, the system comprising the concentration level detection system of claim 9 for detecting concentration and level of urea solution.
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| CN202321778349.9U CN220015313U (en) | 2023-07-07 | 2023-07-07 | Concentration liquid level detection device, system and tail gas aftertreatment system |
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