CN114718709A - Control method for output signal of automobile urea quality sensor - Google Patents
Control method for output signal of automobile urea quality sensor Download PDFInfo
- Publication number
- CN114718709A CN114718709A CN202210543456.7A CN202210543456A CN114718709A CN 114718709 A CN114718709 A CN 114718709A CN 202210543456 A CN202210543456 A CN 202210543456A CN 114718709 A CN114718709 A CN 114718709A
- Authority
- CN
- China
- Prior art keywords
- urea
- sensor
- quality sensor
- signal
- transmitting plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention relates to a control method of an output signal of an automobile urea quality sensor, which comprises the steps of installing the urea quality sensor in a urea box, and filling a certain amount of urea solution into the urea box; switching on a power supply of the urea quality sensor, wherein the urea quality sensor works normally and records voltage energy signals converted from continuous 5 ultrasonic echo signals; if the number of the energy signals higher than the threshold line in the continuously recorded 5 signals is more than or equal to 3, the output signal of the sensor is judged to be reliable, the electronic control unit ECU outputs the actually calculated urea concentration value, if the number of the energy signals higher than the threshold line in the continuously recorded 5 signals is less than or equal to 2, the output signal of the sensor is judged to be unreliable, the sensor outputs an invalid signal code, and the electronic control unit ECU adopts the reliable signal output last time as a substitute signal to output. According to the method, the output value of the sensor is more reliable by optimizing the signal judgment logic of the sensor, and the robustness of the system and the driving experience of a client are improved.
Description
Technical Field
The invention relates to the technical field of automobile aftertreatment systems, in particular to a control method of an output signal of an automobile urea quality sensor.
Background
The automobile urea quality sensor is used as an important component of a driver induction limiting system and is one of new components which are most concerned in a national VI after-treatment injection system, the main function of the automobile urea quality sensor is to monitor the quality of urea, and once the sensor detects that a customer adds an unqualified urea solution, the driver induction system triggers a prompt and limits the normal running of a vehicle after a period of time, so that the customer is forced to add qualified urea again.
The most widely used urea quality sensor in the industry is an ultrasonic sensor, which has the advantages of strong anti-interference performance, high precision, low cost and the like, and is widely pursued by various sensor manufacturers. However, such sensors also have inherent drawbacks-intolerance to air bubbles. When the ultrasonic waves are disturbed by air bubbles in the transmission path, the waveform of the ultrasonic waves is easily influenced, and the sensor outputs an error value by mistake.
Currently, the signal reliability of the sensor in the industry is generally determined only by one threshold line (threshold: voltage energy signal value converted from echo signal of ultrasonic wave), signals higher than the threshold are generally considered to be reliable signals, signals lower than the threshold are unreliable signals, and the difference between manufacturers is only the threshold. The processing mode is simple in logic, but misjudgment is easy to trigger the induction system to light the fault lamp, so that the driving experience of a client is influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a control method of an output signal of an automobile urea quality sensor, enables the output value of the sensor to be more reliable by optimizing a sensor signal judgment logic, and improves the system robustness and the customer driving experience.
In order to achieve the purpose, the invention adopts the following technical scheme:
a control method for output signals of an automobile urea quality sensor comprises the following steps:
step S1, installing a urea quality sensor in a urea box, and filling a certain amount of urea solution into the urea box;
step S2, switching on a power supply of the urea quality sensor, wherein the urea quality sensor works normally and records voltage energy signals converted by continuous 5 ultrasonic echo signals;
step S3, if the energy signals higher than the threshold line in the continuously recorded 5 signals are more than or equal to 3, the step S4 is carried out, and if the energy signals higher than the threshold line in the continuously recorded 5 signals are less than or equal to 2, the step S5 is carried out;
step S4, judging that the output signal of the sensor is reliable, and outputting an actually calculated urea concentration value by an Electronic Control Unit (ECU);
and step S5, judging that the output signal of the sensor is unreliable, outputting an invalid signal code by the sensor, and outputting the reliable signal output in the previous time as a substitute signal by the electronic control unit ECU.
Specifically, the urea quality sensor is an ultrasonic sensor and comprises a ceramic piezoelectric sheet, a transmitting plate and a reflecting plate, wherein the ceramic piezoelectric sheet generates vibration after being electrified, ultrasonic waves are sent out through the transmitting plate and reflected back to the transmitting plate through the reflecting plate, and the ultrasonic wave speed is calculated according to the distance between the transmitting plate and the reflecting time, so that the urea concentration is calculated.
Specifically, in step S1, a certain amount of urea solution is filled in the urea tank, and the urea quality sensor needs to be completely immersed in the urea solution.
Specifically, in step S3, the threshold line is a voltage energy signal peak value into which a first ultrasonic echo signal is converted after the power supply of the urea quality sensor is turned on.
Specifically, in step S4, the ECU outputs an actually calculated urea concentration value as follows:
according to the formula v =2d/TOF, calculating the ultrasonic wave speed under the current concentration;
in the above formula, v, the ultrasonic wave velocity; d, the distance between the transmitting plate and the reflecting plate;
TOF, time of ultrasound wave reception by the transmitting plate-time of ultrasound wave emission by the transmitting plate;
and then obtaining the actual urea concentration value according to the corresponding relation between the ultrasonic wave speed and the urea solutions with different concentrations.
Specifically, in step S5, the ECU outputs the reliable signal output last time as the substitute signal, and after the ECU receives only the invalid code output by the sensor within 7 minutes continuously, the ECU stores the fault, and if the fault occurs in two consecutive driving cycles, the corresponding indicator light on the instrument desk is turned on, and the ECU prompts the driver to perform the operation of limiting the torque and limiting the speed in text.
In the technical scheme, the power-on and power-off of the automobile is a driving cycle.
Compared with the prior art, the invention has the beneficial effects that:
according to the control method for the output signal of the automobile urea quality sensor, the urea concentration value output by the electronic control unit ECU is more reliable by optimizing the sensor signal judgment logic, and compared with the traditional method for judging the reliability of the sensor output signal by only one threshold line, the control method for the output signal of the automobile urea quality sensor can greatly reduce the risk of misinformation of a system and improve the robustness of the system and the driving experience of customers.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method of controlling an output signal of an automotive urea quality sensor in accordance with the present invention;
FIG. 2 is a schematic diagram of the structure of a urea quality sensor body in an embodiment of the invention;
FIG. 3 is a schematic diagram of the operation of a urea quality sensor in an embodiment of the invention;
FIG. 4 is a schematic diagram of the control logic for the sensor signal output in an embodiment of the present invention;
in the figure, 1, a ceramic piezoelectric sheet; 2. a launch plate; 3. a reflective plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
Example (b): see fig. 1-4.
As shown in FIG. 1, the invention provides a control method for an output signal of an automobile urea quality sensor, which comprises the following steps:
step S1, installing a urea quality sensor in a urea box, and filling a certain amount of urea solution into the urea box;
step S2, switching on a power supply of the urea quality sensor, wherein the urea quality sensor works normally and records voltage energy signals converted by continuous 5 ultrasonic echo signals;
step S3, if the energy signals higher than the threshold line in the continuously recorded 5 signals are more than or equal to 3, the step S4 is carried out, and if the energy signals higher than the threshold line in the continuously recorded 5 signals are less than or equal to 2, the step S5 is carried out;
step S4, judging that the output signal of the sensor is reliable, and outputting an actually calculated urea concentration value by an Electronic Control Unit (ECU);
and step S5, judging that the output signal of the sensor is unreliable, outputting an invalid signal code by the sensor, and outputting the reliable signal output in the previous time as a substitute signal by the electronic control unit ECU.
The principle of calculation of the urea concentration in this example:
as shown in fig. 2-3, the urea quality sensor is an ultrasonic sensor, and includes a ceramic piezoelectric plate, a transmitting plate and a reflecting plate, where the ceramic piezoelectric plate vibrates after being energized, and the ultrasonic wave is transmitted through the transmitting plate and reflected back to the transmitting plate by the reflecting plate, so that the ultrasonic wave speed can be calculated according to the distance between the transmitting plate and the reflecting time, and further the urea concentration can be calculated according to the difference of the propagation speeds of the ultrasonic wave in urea solutions with different concentrations.
Specifically, in step S1, a certain amount of urea solution is filled in the urea tank, and the urea quality sensor needs to be completely immersed in the urea solution.
Specifically, in step S3, the threshold line is a voltage energy signal peak value into which a first ultrasonic echo signal is converted after the power supply of the urea quality sensor is turned on.
Specifically, in step S4, the ECU outputs an actually calculated urea concentration value, and the calculation process is as follows:
according to the formula v =2d/TOF, calculating the ultrasonic wave speed under the current concentration;
in the above formula, v, the ultrasonic wave velocity; d, the distance between the transmitting plate and the reflecting plate;
TOF, time of ultrasound wave reception by the transmitting plate-time of ultrasound wave emission by the transmitting plate;
and then obtaining the actual urea concentration value according to the corresponding relation between the ultrasonic wave speed and the urea solutions with different concentrations.
Further, fig. 4 shows a control logic diagram of the sensor signal output. Converting continuous 5 ultrasonic echo signals recorded by the sensor into voltage energy signals, and judging that the signals are reliable when the number of the energy signals higher than a threshold line in the 5 signals is more than or equal to 3, and outputting an actual calculated concentration value by the sensor; and when the energy signals higher than the threshold line in the 5 signals are less than or equal to 2, judging as unreliable signals, and outputting invalid signal codes by the sensor. At the moment, the ECU adopts the previous reliable signal as a temporary substitute signal for output, if the ECU only receives invalid codes output by the sensor within 7 minutes continuously, the ECU carries out fault storage, and if the fault occurs in two continuous driving cycles, a driver inducing system (instrument light, text reminding limit button and speed limit) is activated.
In summary, according to the control method for the output signal of the automobile urea quality sensor, the urea concentration value output by the electronic control unit ECU is more reliable by optimizing the sensor signal judgment logic, and compared with the traditional method for judging the reliability of the sensor output signal by only one threshold line, the control method for the output signal of the automobile urea quality sensor can greatly reduce the risk of false alarm of the system, and improve the robustness of the system and the driving experience of customers.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the structure of the present invention in any way. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the technical scope of the present invention.
Claims (7)
1. A control method for an output signal of an automobile urea quality sensor is characterized by comprising the following steps:
step S1, installing a urea quality sensor in a urea box, and filling a certain amount of urea solution into the urea box;
step S2, switching on a power supply of the urea quality sensor, wherein the urea quality sensor works normally and records voltage energy signals converted by continuous 5 ultrasonic echo signals;
step S3, if the energy signals higher than the threshold line in the continuously recorded 5 signals are more than or equal to 3, the step S4 is carried out, and if the energy signals higher than the threshold line in the continuously recorded 5 signals are less than or equal to 2, the step S5 is carried out;
step S4, judging that the output signal of the sensor is reliable, and outputting an actually calculated urea concentration value by an Electronic Control Unit (ECU);
and step S5, judging that the output signal of the sensor is unreliable, outputting an invalid signal code by the sensor, and outputting the reliable signal output in the previous time as a substitute signal by the electronic control unit ECU.
2. The method according to claim 1, wherein the urea quality sensor is an ultrasonic sensor, and comprises a ceramic piezoelectric plate, a transmitting plate and a reflecting plate, the ceramic piezoelectric plate vibrates when energized, ultrasonic waves are emitted through the transmitting plate, and are reflected back to the transmitting plate through the reflecting plate, and then the ultrasonic wave speed is calculated according to the distance between the transmitting plate and the reflecting time, so as to calculate the urea concentration.
3. The method as claimed in claim 1, wherein in step S1, the urea tank is filled with a certain amount of urea solution, and the urea solution is required to completely submerge the urea quality sensor.
4. The method as claimed in claim 1, wherein the ECU outputs the actual urea concentration value in step S4 by the following steps:
according to the formula
Calculating the ultrasonic wave speed under the current concentration;
in the above formula, v, the ultrasonic wave velocity; d, the distance between the transmitting plate and the reflecting plate;
TOF, time of ultrasound wave reception by the transmitting plate-time of ultrasound wave emission by the transmitting plate;
and then obtaining the actual urea concentration value according to the corresponding relation between the ultrasonic wave speed and the urea solutions with different concentrations.
5. The method as claimed in claim 1, wherein the ECU in step S5 outputs a reliable signal from the previous time as a substitute signal, and when the ECU receives only an invalid code from the sensor within 7 minutes, the ECU stores a fault, and if the fault occurs in two consecutive driving cycles, the corresponding indicator light on the instrument desk is turned on, and the ECU prompts the driver to perform the operation of limiting the torque and speed.
6. The method as claimed in claim 6, wherein the fault occurs in two consecutive driving cycles, and the power-on and power-off of the vehicle is a driving cycle.
7. The urea quality sensor is an ultrasonic sensor and comprises a ceramic piezoelectric sheet, a transmitting plate and a reflecting plate, wherein the ceramic piezoelectric sheet generates vibration after being electrified, ultrasonic waves are transmitted through the transmitting plate and reflected back to the transmitting plate through the reflecting plate, the ultrasonic wave speed is calculated according to the distance between the transmitting plate and the reflecting time, and then the urea concentration is judged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210543456.7A CN114718709A (en) | 2022-05-19 | 2022-05-19 | Control method for output signal of automobile urea quality sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210543456.7A CN114718709A (en) | 2022-05-19 | 2022-05-19 | Control method for output signal of automobile urea quality sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114718709A true CN114718709A (en) | 2022-07-08 |
Family
ID=82232138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210543456.7A Pending CN114718709A (en) | 2022-05-19 | 2022-05-19 | Control method for output signal of automobile urea quality sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114718709A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115639271A (en) * | 2022-12-21 | 2023-01-24 | 潍柴动力股份有限公司 | Method for detecting urea concentration by adopting ultrasonic urea quality sensor and vehicle |
| WO2024041051A1 (en) * | 2022-08-24 | 2024-02-29 | 宁波楷世环保科技有限公司 | Sensor for measuring quality of urea solution, and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103605602A (en) * | 2013-11-29 | 2014-02-26 | 中国航空工业集团公司第六三一研究所 | Method for filtering out malfunctions of distributed computer system |
| WO2014118248A1 (en) * | 2013-01-30 | 2014-08-07 | Inergy Automotive Systems Research (Société Anonyme) | Method for monitoring urea quality of an scr system |
| CN109552403A (en) * | 2018-11-28 | 2019-04-02 | 安徽德孚转向系统股份有限公司 | The Transducer-fault Detecting Method of electric boosting steering system |
| CN110779986A (en) * | 2019-11-06 | 2020-02-11 | 武汉沐之盛电子科技有限公司 | Be applied to two probes of urea quality sensor |
| CN111830932A (en) * | 2020-07-16 | 2020-10-27 | 江铃汽车股份有限公司 | Control method of sensor software |
| CN114215631A (en) * | 2021-11-30 | 2022-03-22 | 江铃汽车股份有限公司 | Signal receiving, transmitting and processing method for urea quality sensor |
-
2022
- 2022-05-19 CN CN202210543456.7A patent/CN114718709A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014118248A1 (en) * | 2013-01-30 | 2014-08-07 | Inergy Automotive Systems Research (Société Anonyme) | Method for monitoring urea quality of an scr system |
| CN103605602A (en) * | 2013-11-29 | 2014-02-26 | 中国航空工业集团公司第六三一研究所 | Method for filtering out malfunctions of distributed computer system |
| CN109552403A (en) * | 2018-11-28 | 2019-04-02 | 安徽德孚转向系统股份有限公司 | The Transducer-fault Detecting Method of electric boosting steering system |
| CN110779986A (en) * | 2019-11-06 | 2020-02-11 | 武汉沐之盛电子科技有限公司 | Be applied to two probes of urea quality sensor |
| CN111830932A (en) * | 2020-07-16 | 2020-10-27 | 江铃汽车股份有限公司 | Control method of sensor software |
| CN114215631A (en) * | 2021-11-30 | 2022-03-22 | 江铃汽车股份有限公司 | Signal receiving, transmitting and processing method for urea quality sensor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024041051A1 (en) * | 2022-08-24 | 2024-02-29 | 宁波楷世环保科技有限公司 | Sensor for measuring quality of urea solution, and method |
| CN115639271A (en) * | 2022-12-21 | 2023-01-24 | 潍柴动力股份有限公司 | Method for detecting urea concentration by adopting ultrasonic urea quality sensor and vehicle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114718709A (en) | Control method for output signal of automobile urea quality sensor | |
| CN103201600B (en) | Systems and methods of determining a quality and/or depth of diesel exhaust fluid | |
| CN111997722B (en) | Ultrasonic quality sensor strategy for vehicles | |
| CN102749109B (en) | Aftershock energy control-based method for reducing working blind areas of ultrasonic energy transducer | |
| US6573732B1 (en) | Dynamic range sensor and method of detecting near field echo signals | |
| US20180045554A1 (en) | Systems and methods for power management in ultrasonic sensors | |
| CN104442758A (en) | Automobile anticollision system based on ultrasonic ranging device with temperature compensation | |
| US6885611B2 (en) | Method for high-pass filtering for echo processing in time of flight ranging systems | |
| CN111830932B (en) | Control method of sensor software | |
| US6865137B2 (en) | Method for pulse offset calibration in time of flight ranging systems | |
| CN104656088A (en) | Ultrasonic automobile anti-collision system having temperature compensation function and adopting pulse counting | |
| CN104656087A (en) | Ultrasonic automobile collision avoidance system adopting pulse counting | |
| US8560215B2 (en) | Process and system for determining fuel consumption of a motor vehicle | |
| Zhang | Research of ultrasonic distance measurement device | |
| CN114215631A (en) | Signal receiving, transmitting and processing method for urea quality sensor | |
| CN105911548A (en) | DSP-controller-based ultrasonic range finder | |
| CN113267783A (en) | Apparatus, system and method for ultra-short range detection of obstacles | |
| CN2869805Y (en) | Supersonic-wave sensor external sleeve pipe | |
| CN219162375U (en) | Ultrasonic detection circuit, ultrasonic sensor chip and automobile radar device | |
| CN117189323A (en) | Compensation method and device for urea concentration, electronic equipment and storage medium | |
| CN213689940U (en) | Wireless ultrasonic distance meter based on Internet of things | |
| CN220015313U (en) | Concentration liquid level detection device, system and tail gas aftertreatment system | |
| Ping et al. | High-precision ultrasonic ranging system | |
| JP6435926B2 (en) | Control system | |
| WO2018007278A1 (en) | Method for detecting a malfunction of an ultrasonic fluid sensing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |