CN114441631B - Method, recording medium and system for detecting concentration of urea for vehicle - Google Patents
Method, recording medium and system for detecting concentration of urea for vehicle Download PDFInfo
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- CN114441631B CN114441631B CN202210054399.6A CN202210054399A CN114441631B CN 114441631 B CN114441631 B CN 114441631B CN 202210054399 A CN202210054399 A CN 202210054399A CN 114441631 B CN114441631 B CN 114441631B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/024—Analysing fluids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention belongs to the technical field of automobile electronics, and particularly relates to a method for detecting concentration of urea for an automobile, which comprises the following steps: the vehicle state is judged through the vehicle speed and the engine speed, the concentration of the urea solution is detected by the ultrasonic sensor and the impedance sensor in sequence, the occurrence of false alarm of concentration faults of the ultrasonic sensor caused by bubbles is reduced, the torque and speed of the vehicle are reduced, and the driving experience of a driver is improved. The invention also provides a non-transitory readable recording medium storing a method program and a system comprising the medium, and the program can be called by a processing circuit to execute the method.
Description
Technical Field
The invention belongs to the technical field of automobile electronics, and discloses a method for detecting concentration of urea for an automobile, a recording medium and a system which are stored with programs capable of executing the method.
Background
At present, the six commercial vehicles in China need to detect the concentration of urea, and at present, the main flow of detecting the concentration of urea solution at home and abroad adopts an ultrasonic principle. The urea sensor captures ultrasonic transmission time through an ultrasonic technology, and carries out sound velocity calculation according to a fixed reflection distance so as to judge the concentration of the solution.
Due to the defect of the ultrasonic wave principle, the urea sensor product of the technology can be influenced by bubbles in the urea solution under the specific application working condition of the vehicle (such as first urea injection or over bump road surface) so as to not timely and accurately detect the concentration of the urea solution.
In the environment where bubbles exist, the speed of ultrasonic wave transmission is affected by the bubbles (such as penetration, reflection and the like) to slow down, so that the sound wave transmission time is prolonged, and false alarm with lower concentration value occurs. When the concentration value detected by the urea sensor is lower than the actual value and exceeds a certain range (< 28%) for a certain time, the ECU reports a fault that the concentration of urea is lower, and the vehicle is limited in torsion and speed, so that the running of the vehicle is seriously influenced. The urea concentration detection is influenced by bubbles, belongs to the defect phenomenon of ultrasonic technology, and is a difficult problem to be solved in the whole commercial vehicle industry.
At present, urea sensor based on vehicle speed and rotating speed strategies is developed by some engine manufacturers and urea sensor manufacturers, and the problem of low urea concentration due to false alarm under most driving conditions is solved to a certain extent. However, the problem of low urea concentration false alarm cannot be solved according to the working conditions that bubbles are attached for a long time and urea liquid level fluctuation occurs in the running process.
Disclosure of Invention
Aiming at the problems, the invention provides a method for detecting the concentration of urea for a vehicle, which comprises the following steps:
s1, detecting whether the urea liquid level rises after power is on, entering a filling mode if the urea liquid level rises, and detecting whether the urea concentration is in a set standard range by using an ultrasonic sensor if the urea liquid level does not rise;
s2, if the concentration of urea detected by the ultrasonic sensor is in the standard range, outputting a urea concentration value detected by the ultrasonic sensor;
s3, if the urea concentration detected by the ultrasonic sensor exceeds the standard range, starting an impedance sensor to detect whether the urea concentration is in the standard range;
s4, if the urea concentration detected by the impedance sensor is in the standard range, outputting a urea concentration value detected by the impedance sensor;
s5, if the urea concentration detected by the impedance sensor exceeds the standard range, outputting the urea concentration value detected by the impedance sensor and marking unqualified.
Preferably, the standard range is 28% -36%.
The ultrasonic measuring method has no mechanical transmission part, does not contact the measured liquid, is not afraid of electromagnetic interference and acid-base corrosion, has short response time and can conveniently implement real-time measurement, so the technical scheme does not exclude the ultrasonic sensor from being used for concentration measurement, only detects the concentration of the urea solution based on the double-probe sensor, and overcomes the defect that the ultrasonic probe sensor detects the concentration of the urea solution. The ultrasonic sensor is mainly used for detecting the concentration of the urea solution when the urea solution is stable and has no bubbles; the other path of impedance sensor is mainly used for detecting the concentration of bubbles in the urea solution; meanwhile, a speed and speed filtering strategy is added, so that the urea sensor can truly detect the current urea concentration value.
Preferably, the step S1 is to detect the vehicle speed and the engine speed before starting, determine whether the vehicle is in a driving state, an idle state or a parking state, and then perform the subsequent urea concentration detection step corresponding to different states.
Preferably, when the vehicle speed is more than 0km/h and the engine speed is more than 500rpm, judging that the vehicle is in the running state; when the vehicle speed=0 km/h and the engine speed is more than 500rpm, judging that the vehicle is in the idle state; when the vehicle speed=0 km/h and the engine speed is less than or equal to 500rpm, the vehicle is judged to be in the stopped state.
Further, when the filling mode is in the filling mode, firstly, detecting the urea concentration by using an ultrasonic sensor, if the urea concentration is detected to be in the standard range by using the ultrasonic sensor, immediately repeating the steps S1-S5, otherwise, starting an impedance sensor to detect the urea concentration, if the urea concentration is detected to be in the standard range by using the impedance sensor, namely, repeating the steps S1-S5, otherwise, outputting a measured value, and repeating the steps S1-S5.
The engine ECU sends the information of the engine speed and the engine rotating speed to the post-processing CAN through the CAN bus, judges the current motion state (running, idling or stationary) of the vehicle according to the speed rotating speed signal of the vehicle, combines the urea concentration value measured by the ultrasonic wave and the impedance sensor according to the motion state of the vehicle, outputs the truest and reasonable urea concentration value through filtering treatment, and solves the false alarm problem in the traditional detection method.
Another aspect of the present invention provides a non-transitory readable recording medium storing one or more programs including a plurality of instructions, which when executed, cause a processing circuit to perform a method for detecting a concentration of urea in a vehicle as described above.
In another aspect, the present invention provides a system for detecting a concentration of urea in a vehicle, including a processing circuit and a memory electrically coupled to the processing circuit, where the memory is configured to store at least one program, the program includes a plurality of instructions, and the processing circuit runs the program to perform the method for detecting a concentration of urea in a vehicle.
Drawings
FIG. 1 is a schematic diagram of a detection flow when a vehicle is in a driving state in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a detection flow when a vehicle is in an idle state according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a detection flow when a vehicle is in a parking state in an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention, where the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are obtained by a person skilled in the art without innovative work, are intended to be within the scope of the invention.
As shown in fig. 1, when the vehicle speed is >0km/h and the rotation speed is >500rpm, judging that the vehicle is in a running state, firstly, detecting whether the urea liquid level rises or not by the urea sensor, entering a filling mode if the liquid level rises, sequentially detecting whether the urea concentration value detected by the ultrasonic sensor and the impedance sensor is in a range of 28% -36%, outputting an effective stable value confirmed by the sensor after power-on if the urea concentration value is in the range, and outputting an actual non-qualified value if the urea concentration value is out of the range and the concentration value is steadily reduced (or risen) and effective.
When the liquid level does not rise, firstly detecting whether the urea concentration value detected by the ultrasonic sensor is in the range of 28% -36%, and if so, locking the output of the concentration value detected by the current ultrasonic sensor. When the concentration value detected by the ultrasonic sensor is out of range, detecting whether the concentration value detected by the impedance sensor is in the range of 28% -36%, and if so, locking the output of the concentration value detected by the current impedance sensor. When the concentration values detected by the ultrasonic sensor and the impedance sensor are out of range and last for 28 minutes after power-on, outputting the current actual unsuitable value.
As shown in fig. 2, when the vehicle speed=0 km/h and the rotation speed >500rpm, it is judged that the vehicle is in an idle state, the urea sensor firstly detects whether the urea liquid level rises, if the urea liquid level rises, the filling mode is entered, and the effective stable value confirmed by the sensor after power-up is output.
When the liquid level does not rise, firstly detecting whether the urea concentration value detected by the ultrasonic sensor is in the range of 28% -36%, and if so, locking the output of the concentration value detected by the current ultrasonic sensor. When the concentration value detected by the ultrasonic sensor is out of range, detecting whether the concentration value detected by the impedance sensor is in the range of 28% -36%, and if so, locking the output of the concentration value detected by the current impedance sensor. When the concentration values detected by the ultrasonic sensor and the impedance sensor are out of range, outputting the current actual unsuitable value.
As shown in fig. 3, when the vehicle speed=0 km/h and the rotation speed is less than 500rpm, it is judged that the vehicle is in a stopped state, the urea sensor firstly detects whether the urea liquid level rises, if the urea liquid level rises, the vehicle enters a filling mode, and sequentially detects whether the urea concentration value detected by the ultrasonic sensor and the impedance sensor is in the range of 28% -36%, if the urea concentration value is in the range, the current effective stable value is output, and if the urea concentration value is not in the range, the invalid value (FB) is output.
When the liquid level does not rise, firstly detecting whether the urea concentration value detected by the ultrasonic sensor is in the range of 28% -36%, and outputting the concentration value detected by the current ultrasonic sensor if the urea concentration value is in the range. When the concentration value detected by the ultrasonic sensor is out of range, detecting whether the concentration value detected by the impedance sensor is in the range of 28% -36%, and if so, outputting the concentration value detected by the current impedance sensor. When the concentration values detected by the ultrasonic sensor and the impedance sensor are out of range, outputting the current actual unsuitable value.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the invention may take the form of a computer program product embodied on one or more computers, usable storage media (including but not limited to disk storage, CD-ROM, optical storage, and the like) having computer usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The method comprises the steps of assembling the steps into a program and storing the program in a hard disk or other non-transitory storage media, so that the technical scheme of the non-transitory readable recording medium is formed; the storage medium is electrically connected with a computer processor, and the real-time detection of the urea concentration can be completed through data processing, so that the technical scheme of the vehicle urea concentration detection system is formed.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The method for detecting the concentration of the urea for the vehicle is characterized by comprising the following steps of:
s1, detecting whether the urea liquid level rises after power is on, entering a filling mode if the urea liquid level rises, and detecting whether the urea concentration is in a set standard range by using an ultrasonic sensor if the urea liquid level does not rise;
s2, if the concentration of urea detected by the ultrasonic sensor is in the standard range, outputting a urea concentration value detected by the ultrasonic sensor;
s3, if the urea concentration detected by the ultrasonic sensor exceeds the standard range, starting an impedance sensor to detect whether the urea concentration is in the standard range;
s4, if the urea concentration detected by the impedance sensor is in the standard range, outputting a urea concentration value detected by the impedance sensor;
s5, if the urea concentration detected by the impedance sensor exceeds the standard range, outputting the urea concentration value detected by the impedance sensor and marking unqualified.
2. The method for detecting the concentration of urea for a vehicle according to claim 1, wherein the standard range is 28% -36%.
3. The method for detecting the concentration of urea in a vehicle according to claim 2, wherein the step S1 is performed by detecting the vehicle speed and the engine speed before starting, determining whether the vehicle is in a driving state, an idling state or a stopped state, and performing the subsequent urea concentration detection step corresponding to the different states.
4. A method for detecting the concentration of urea for a vehicle according to claim 3, wherein when the vehicle speed is >0km/h and the engine speed is >500rpm, it is judged that the vehicle is in the running state; when the vehicle speed=0 km/h and the engine speed is more than 500rpm, judging that the vehicle is in the idle state; when the vehicle speed=0 km/h and the engine speed is less than or equal to 500rpm, the vehicle is judged to be in the stopped state.
5. The method according to any one of claims 1 to 4, wherein when in the filling mode, the step S1 to S5 is repeated immediately when the urea concentration is detected by an ultrasonic sensor, and if the urea concentration is detected by the ultrasonic sensor in the standard range, the step S1 to S5 is repeated when the urea concentration is detected by an impedance sensor, and if the urea concentration is detected by the impedance sensor in the standard range, the step S1 to S5 is repeated, and if the measured value is output, the step S1 to S5 is repeated.
6. A non-transitory readable recording medium storing one or more programs comprising a plurality of instructions, wherein the instructions, when executed, cause a processing circuit to perform a method of detecting a concentration of urea for a vehicle as recited in claim 5.
7. A vehicle urea concentration detection system comprising a processing circuit and a memory electrically coupled thereto, wherein the memory is configured to store at least one program comprising a plurality of instructions, the processing circuit running the program to perform a vehicle urea concentration detection method as set forth in claim 5.
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| CN202210054399.6A CN114441631B (en) | 2022-01-18 | 2022-01-18 | Method, recording medium and system for detecting concentration of urea for vehicle |
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| CN202210054399.6A CN114441631B (en) | 2022-01-18 | 2022-01-18 | Method, recording medium and system for detecting concentration of urea for vehicle |
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| CN114441631B true CN114441631B (en) | 2023-10-13 |
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| CN115822764A (en) * | 2022-08-24 | 2023-03-21 | 宁波楷世环保科技有限公司 | Sensor and method for measuring quality of urea solution |
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