CN114622974B - Intelligent detection and diagnosis system and method for motor vehicle exhaust - Google Patents
Intelligent detection and diagnosis system and method for motor vehicle exhaust Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000003745 diagnosis Methods 0.000 title claims abstract description 19
- 238000002485 combustion reaction Methods 0.000 claims abstract description 41
- 239000000446 fuel Substances 0.000 claims abstract description 40
- 230000001133 acceleration Effects 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 238000012423 maintenance Methods 0.000 claims description 24
- 238000004364 calculation method Methods 0.000 claims description 10
- 239000003921 oil Substances 0.000 claims description 10
- 230000006698 induction Effects 0.000 claims description 7
- 238000011156 evaluation Methods 0.000 claims description 6
- 238000003062 neural network model Methods 0.000 claims description 4
- 230000001939 inductive effect Effects 0.000 claims description 3
- 238000012549 training Methods 0.000 claims description 3
- 239000010705 motor oil Substances 0.000 claims description 2
- 239000000295 fuel oil Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 25
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 238000007689 inspection Methods 0.000 description 8
- 239000004215 Carbon black (E152) Substances 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 description 5
- 229930195733 hydrocarbon Natural products 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 5
- 239000013618 particulate matter Substances 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
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- 238000000746 purification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
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- 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
-
- 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/085—Safety, indicating, or supervising devices with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Testing Of Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention relates to the field of engine control test, and discloses an intelligent detection and diagnosis system and method for motor vehicle tail gas, wherein the intelligent detection and diagnosis system for motor vehicle tail gas comprises: the automobile energy conversion acquisition module is used for detecting an automobile and acquiring fuel oil combustion efficiency. The temperature sensing module is used for detecting the working temperature of the engine. The tail gas intake module is used for quantitatively acquiring automobile tail gas. And the tail gas detection module is used for detecting and obtaining each component and concentration. The acceleration state acquisition module is used for acquiring the current vehicle acceleration condition. The vehicle load obtaining module is used for obtaining the current vehicle load ratio. The analysis and judgment module is used for searching a load ratio, temperature, fuel combustion efficiency, acceleration and an automobile exhaust-damage information table to obtain the damage type and probability. The damage type of the automobile engine or the control system is obtained by analyzing the fuel combustion efficiency, the working temperature, the automobile components and the concentration and depending on the load ratio and the acceleration, and the analysis is comprehensive and accurate.
Description
Technical Field
The invention relates to the field of engine control and test, in particular to an intelligent detection and diagnosis system and method for motor vehicle tail gas.
Background
The research field of the project is the field of atmospheric environmental pollution treatment, in particular to the field of motor vehicle tail gas pollution treatment. By the end of 2021 years, the number of motor vehicles is up to 3.95 hundred million; according to the statistics of 'the annual report 2021 of the environmental management of the China Mobile resources', in 2020, the total emission amount of four pollutants of motor vehicles in China is 1593.0 ten thousand tons. Wherein, the emission amounts of carbon monoxide (CO), Hydrocarbon (HC), nitrogen oxide (NOx) and Particulate Matter (PM) are 769.7 ten thousand tons, 190.2 ten thousand tons, 626.3 ten thousand tons and 6.8 ten thousand tons respectively, the traditional fuel automobile is a main contributor of the total emission amount of pollutants, and the emission amounts of the carbon monoxide (CO), the Hydrocarbon (HC), the nitrogen oxide (NOx) and the Particulate Matter (PM) exceed 90 percent of the total emission amount of the automobile; 10166.4 pieces of motor vehicle regular inspection data are reported through the national-province-city three-level networking platform, and the number of motor vehicle regular inspection is increased along with the continuous increase of vehicles. In the process of vehicle emission inspection, a large amount of exhaust gas is generated and directly discharged into the atmosphere without being treated, which seriously harms the physical health of inspection personnel and the surrounding atmospheric environment, so that the vehicle emission inspection mechanism is gradually becoming a local fixed pollution source. Especially, vehicles with excessive emission can generate a large amount of pollutants in the emission inspection process, and the design of the tail gas purification system capable of efficiently collecting and purifying the tail gas of the motor vehicle in the emission inspection process has important significance for controlling air pollution in China, improving the quality of life of people and relieving the pollution of the emission inspection mechanism to the surrounding environment.
The fuel enters the engine to be combusted, the engine and a control system thereof directly cause whether the automobile exhaust emission can reach the standard, the existing automobile exhaust detection can not intuitively reflect the engine problem, and the reference is poor.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides an intelligent detection and diagnosis system for motor vehicle exhaust, comprising:
the automobile energy conversion acquisition module is used for detecting the automobile and acquiring the fuel combustion efficiency P i ；
The temperature sensing module is used for detecting the working temperature of the engine;
the tail gas intake module is used for quantitatively acquiring automobile tail gas;
an exhaust gas detection module for detecting each component Z for obtaining automobile exhaust gas i And corresponding concentration c i ；
The acceleration state acquisition module is used for acquiring the current vehicle acceleration condition;
the vehicle load obtaining module is used for obtaining the current vehicle load ratio;
the damage model building module is used for building a load ratio, working temperature, fuel combustion efficiency, acceleration and automobile exhaust-damage information table;
the vehicle condition analysis module is used for evaluating the current vehicle state and obtaining a damage type-weight value information table;
an analysis and judgment module used for analyzing and judging the load ratio, the working temperature and the fuel combustion efficiency P i Acceleration, automobile exhaust component Z i And concentration c i Looking up the load ratio, working temperature, fuel combustion efficiency, acceleration and automobile tail gas-damage information table to obtain damage types and corresponding probabilities G i ；
A calculation and analysis module for searching the damage type-weight value information table according to the damage type to obtain a corresponding damage weight value W i And calculating to obtain an evaluation risk value
And sorting according to the risk values from large to small, and recommending.
Preferably: the current vehicle load ratio obtaining method is to obtain a current vehicle load M through testing; and is matched with a preset automobile load standard value M Sign board Calculating to obtain the current vehicle load ratio of
。
Preferably: the automobile energy conversion acquisition module comprises an oil mass unit acquisition module, a heat output acquisition module and an efficiency calculation module;
an oil quantity unit acquisition module for acquiring an inlet flow C of an automobile engine oil quantity i ；
The heat output acquisition module is used for detecting the engine to acquire the heat output rate Q of the engine i (ii) a Calculating and obtaining fuel combustion efficiency
Wherein R is the fuel calorific value.
Preferably: the heat output acquisition module comprises a temperature detection module, an expansion work induction module and a pointThe device comprises a fire sensing module, a heat calculating module and an efficiency calculating module; the ignition induction module is used for calibrating ignition; the expansion work induction module is used for inducing t before ignition 1 T a preset time period after ignition 2 Output power p of i (ii) a The temperature detection module is used for sensing the pre-ignition t inside the fuel cylinder 1 Temperature T of 1 And a preset time period after ignition t 2 Temperature T of 2 (ii) a t1 is the time point before ignition, t2 is the time point after ignition, and the interval between the ignition time and t2 is the preset time period; the heat quantity calculating module is used for calculating the heat quantity output rate Q i =Cm(T 2 -T 1 )+p i Wherein C is a known amount and m is a fixed amount; the efficiency calculation module is used for calculating the fuel combustion efficiency
。
Preferably: the heat output rate Q i The obtaining method comprises detecting and obtaining concentrations c of various combustion heat components i And searching a preset component-heat value information table through the combustion component to obtain the heat value q of the corresponding component i Residual heat rate
And calculating the heat output rate
。
Preferably: the intelligent detection and diagnosis system for the motor vehicle exhaust gas also comprises a maintenance recommendation module, wherein the maintenance recommendation module is used for obtaining the recommendation content and searching a preset type-recommendation information table according to the damage type to obtain the maintenance recommendation content.
Preferably: the intelligent detection and diagnosis system for the tail gas of the motor vehicle further comprises: the damage standard value building module is used for building an early warning prompt standard value according to the damage type
Wherein f is a damage numerical value, and b is an early warning factor;
the damage prediction module is used for detecting and obtaining the current damage value f 'and judging whether f' exceeds f Watch (A) And if so, training and predicting the damage time according to the neural network model.
Preferably: the maintenance recommendation content comprises one or more of maintenance time, maintenance money and maintenance method.
The invention also provides an intelligent detection and diagnosis method for the tail gas of the motor vehicle, which is applied to the intelligent detection and diagnosis system for the tail gas of the motor vehicle and comprises the following steps:
s1, detecting the automobile and obtaining the fuel combustion efficiency P i ；
S2, detecting and obtaining the working temperature of the engine;
s3, detecting and obtaining each component Z of the automobile exhaust i And the concentrations c corresponding to the respective components of the automobile exhaust i ；
S4, acquiring the current vehicle acceleration condition;
s5, acquiring the current vehicle load ratio;
s6, searching a preset load ratio, temperature, fuel combustion efficiency, acceleration and automobile exhaust-damage information table to obtain the damage type and the corresponding probability G i ；
S7, searching a preset damage type-weight value information table to obtain the corresponding damage weight value W i ；
S8, calculating to obtain an evaluation risk value
And sorting according to the risk values from large to small, and recommending.
The invention has the technical effects and advantages that: by analysing fuel combustion efficiency P i Working temperature, automobile exhaust component Z i And concentration c i And the damage type of the automobile engine or the control system is obtained by depending on the load ratio and the acceleration, the analysis is comprehensive and accurate, and a driver canSo as to know the vehicle condition or maintain by itself, and avoid the resource waste of blind maintenance and the dependence and limitation of human experience.
Drawings
Fig. 1 is a block diagram of an intelligent detection and diagnosis system for motor vehicle exhaust according to the present invention.
Fig. 2 is a block diagram of an automobile energy conversion acquisition module in the intelligent detection and diagnosis system for the exhaust gas of the motor vehicle according to the present invention.
Fig. 3 is a flow chart of the intelligent detection and diagnosis method for the motor vehicle exhaust gas provided by the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description. The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Example 1
Referring to fig. 1, in this embodiment, an intelligent detecting and diagnosing system for detecting and diagnosing vehicle exhaust is provided, for analyzing and determining vehicle exhaust to obtain a damage type, the intelligent detecting and diagnosing system for detecting and diagnosing vehicle exhaust includes:
referring to fig. 2, the vehicle energy conversion obtaining module is used for detecting a vehicle and obtaining fuel combustion efficiency P i . The automobile energy conversion acquisition module can comprise an oil mass unit acquisition module, a heat output acquisition module and an efficiency calculation module.
An oil quantity unit acquisition module for acquiring the oil quantity of the automobile engine to acquire the inlet flow C i The oil inlet pipe of the engine can be arranged, the oil quantity unit acquisition module can be a flowmeter, and details are not specifically described herein for the prior art.
A heat output acquisition module for startingDetecting to obtain the heat output rate Q of the engine i . Thereby obtaining the fuel combustion efficiency P i . The heat output acquisition module can include temperature detection module, work of expansion response module, ignition response module, heat calculation module, the ignition response module is used for demarcating the ignition, the ignition is the interval operation, can respond to the ignition time point through the ignition response module, specifically do not give unnecessary details here. The expansion work induction module is used for inducing t before ignition 1 T a preset time period after ignition 2 Output power p of i (ii) a The temperature detection module is used for sensing the pre-ignition t inside the fuel cylinder 1 Temperature T of 1 And a preset time period after ignition t 2 Temperature T of 2 (ii) a t1 is the time point before ignition, t2 is the time point after ignition, and the interval between the ignition time and t2 is the preset time period; . The preset time period can ensure that the fuel oil passes through a delay combustion period, a display combustion period and a post combustion period, so that the part of the fuel oil which can be combusted can be fully combusted. The expansion work induction module can be obtained by calculating through the movement of the piston and can also be obtained by calculating through work doing, and details are not described herein. A temperature detection module for sensing t before ignition in the fuel cylinder 1 Temperature T of 1 And ignition time is a preset time period t 2 Temperature T of 2 . The heat quantity calculating module is used for calculating the heat quantity output rate Q i =Cm(T 2 -T 1 )+p i Wherein C is a known amount and m is a fixed amount. The efficiency calculation module is used for calculating the fuel combustion efficiency
And R is the fuel calorific value. Of course, the combustion temperature can also be obtained by other methods, such as detecting the residual combustion amount of the fuel oil tail gas, and the specific method is to detect and obtain the concentration c of various combustion heat components i And searching a preset component-heat value information table through the combustion components to obtain the heat value q of the corresponding component i Residual heat rate
And by heat output rate
The calculation is obtained, and details are not described herein.
The temperature sensing module is used for detecting the working temperature of the engine, and the temperature detecting module is in the prior art and is not specifically described herein.
The tail gas absorbs the module, sets up in vehicle vent-pipe, the inside wait position of the outer check out test set of car for the ration obtains automobile exhaust, the ration obtain can set up according to the detection demand, the volume of the tail gas of acquireing is enough to guarantee to detect the use. The exhaust pipe is preferably communicated with the exhaust pipe, so that online detection can be performed, and the detection efficiency is improved. The tail gas intake module can be a combination of a one-way negative pressure pipe, a piston and a push-pull drive, and the tail gas is pumped into the detection cavity to be detected, wherein the negative pressure pipe, the piston, the push-pull drive and the detection cavity are in the prior art, and are not described in detail.
The tail gas detection module is used for detecting and obtaining each component Z of the automobile tail gas i And the concentrations c corresponding to the respective components of the automobile exhaust i The components of the automobile exhaust can be CO, HC and NO x And obtaining the component content, wherein the specific detection is the prior art, and the details are not described herein.
The acceleration state obtaining module is configured to obtain a current vehicle acceleration state, where the acceleration state may be acceleration, constant speed, and deceleration, and details are not described herein.
The vehicle load acquisition module is used for acquiring the current vehicle load M and is matched with a preset vehicle load standard value M Sign board Then the current vehicle load ratio is calculated to be
The measured current vehicle load comprises the weight of the vehicle body and the weight of the pulling load article, the standard value of the vehicle load can comprise the standard value of the weight of the vehicle body, the standard value can be determined according to the vehicle load capacity, and the standard value is not specifically described herein any more, and certainly not comprising the vehicle body and the standard value of the vehicle load at the same timeThe weight of the body is not described herein.
And the damage model building module is used for building a load ratio, working temperature, fuel combustion efficiency Pi, acceleration and automobile exhaust-damage information table, and the retrieval result of the damage information table is not a value output and comprises a plurality of possibilities and corresponding probabilities. For example, a detection mode can be constructed, and the damage type can be obtained by searching according to the detected load ratio, working temperature, acceleration, tail gas components and concentration, for example, if the load ratio of the automobile is 1.2, the acceleration is 0.5, the working temperature is too high, the detection in the tail gas of the automobile is normal, and the damage type can be abnormal coolant, hot air fan problem, fuel combustion efficiency P i Normal and lubrication oil problems, and the probability of each damage type can be calculated according to specific numerical values.
The vehicle condition analysis module is used for evaluating the current vehicle state and obtaining a damage type-weight value information table, for example, after the vehicle runs for 7 years, the vehicle runs for 10 kilometers, the engine is small, and the weight value of the crankshaft serious wear is 0.5; severe strain on the piston and cylinder wall of 0.4; parts such as intake camshaft small teeth and exhaust camshaft small teeth are worn by 0.36, engine control is delayed by 0.3, other damages exist, details are not described herein specifically, and the weight values can be automatically or manually constructed according to the type, application, stroke number, driving age, maintenance record and the like of the vehicle, and details are not described herein specifically.
An analysis and judgment module used for analyzing and judging the current vehicle load ratio, the working temperature and the fuel combustion efficiency P i Acceleration, automobile exhaust component Z i And concentration c i Searching the load ratio, temperature, fuel combustion efficiency, acceleration and automobile exhaust-damage information table to obtain the damage type and corresponding probability G i 。
A calculation analysis module for searching the damage type-weight value information table according to the damage type to obtain the corresponding damage weight value W i And calculating to obtain an evaluation risk value
According to the windAnd sorting the risk values from large to small and recommending the risk values. By analysing fuel combustion efficiency P i Working temperature, automobile exhaust component Z i And concentration c i And the damage type of the automobile engine or the control system is obtained by depending on the load ratio and the acceleration, the analysis is comprehensive and accurate, a driver can know the condition of the automobile or can maintain the automobile by himself, and the resource waste, the artificial experience dependence and the limitation of blind maintenance are avoided.
And the maintenance recommending module is used for obtaining the recommended content and searching a preset type-recommendation information table through the damage type so as to obtain the maintenance recommended content, the set type-recommendation information table can be constructed according to the experience of a maintenance master, and the details are not repeated herein. The recommended maintenance content may include maintenance time, maintenance money, maintenance method, and the like, which are not described herein in detail.
Example 2
The intelligent detection and diagnosis system for the tail gas of the motor vehicle further comprises: a damage standard value construction module for constructing an early warning prompt standard value according to the damage type
Wherein f is a damage value, and b is an early warning factor. The early warning prompting standard value can comprise temperature and fuel combustion efficiency P i Automobile exhaust component Z i And concentration c i Values corresponding to each damage type are not described herein.
A damage prediction module for detecting the current damage value f 'and judging whether f' exceeds f Watch (A) Where the excess is greater or less than, and if so, the predicted damage time is trained according to a neural network model. For example, the temperature determination criterion is greater than, and the fuel combustion efficiency P is i The judgment criterion is less than i And concentration c i The value decision criterion is greater than, the neural network model is prior art, and the training mode is not described herein.
Example 3
Referring to fig. 3, in the present embodiment, an intelligent detection and diagnosis method for motor vehicle exhaust is provided, which includes the following steps:
s1, detecting the automobile and obtaining the fuel combustion efficiency P i 。
And S2, detecting and obtaining the engine working temperature.
S3, detecting and obtaining each component Z of the automobile exhaust i And the concentrations c corresponding to the respective components of the automobile exhaust i 。
And S4, acquiring the current vehicle acceleration condition.
S5, obtaining the current vehicle load M and combining the current vehicle load M with a preset vehicle load standard value M Sign board Obtaining a current vehicle load ratio of
。
S6, searching a preset load ratio, temperature, fuel combustion efficiency, acceleration and automobile exhaust-damage information table to obtain the damage type and the corresponding probability G i 。
S7, searching a preset damage type-weight value information table to obtain the corresponding damage weight value W i 。
S8, calculating and obtaining an evaluation risk value
And sorting according to the risk values from large to small, and recommending.
It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by one of ordinary skill in the art and related arts based on the embodiments of the present invention without any creative effort, shall fall within the protection scope of the present invention. Structures, devices, and methods of operation not specifically described or illustrated herein are generally practiced in the art without specific recitation or limitation.
Claims (8)
1. The intelligent detection and diagnosis system for the tail gas of the motor vehicle is characterized by comprising:
the automobile energy conversion acquisition module is used for detecting the automobile and acquiring the fuel combustion efficiency P i ；
The temperature sensing module is used for detecting the working temperature of the engine;
the tail gas intake module is used for quantitatively acquiring automobile tail gas;
an exhaust gas detection module for detecting each component Z for obtaining automobile exhaust gas i And corresponding concentration c i ；
The acceleration state acquisition module is used for acquiring the current vehicle acceleration condition;
the vehicle load obtaining module is used for obtaining the current vehicle load ratio;
the damage model building module is used for building a load ratio, working temperature, fuel combustion efficiency, acceleration and automobile exhaust-damage information table;
the vehicle condition analysis module is used for evaluating the current vehicle state and obtaining a damage type-weight value information table;
an analysis and judgment module for analyzing the load ratio, the working temperature and the fuel combustion efficiency P i Acceleration, automobile exhaust component Z i And concentration c i Looking up the load ratio, working temperature, fuel combustion efficiency, acceleration and automobile tail gas-damage information table to obtain damage types and corresponding probabilities G i ；
A calculation and analysis module for searching the damage type-weight value information table according to the damage type to obtain a corresponding damage weight value W i And calculating to obtain an evaluation risk value
And sorting according to the risk values from large to small, and recommending.
2. The intelligent detecting and diagnosing system for motor vehicle exhaust gas as claimed in claim 1, wherein said engine exhaust gas pressure sensor is arranged to sense the pressure of the exhaust gasThe method for obtaining the load ratio of the front vehicle comprises the steps of obtaining the load M of the current vehicle for testing; and is matched with a preset automobile load standard value M Sign board Calculating to obtain the current vehicle load ratio of
。
3. The intelligent detection and diagnosis system for the motor vehicle exhaust according to claim 1, wherein the vehicle energy conversion acquisition module comprises an oil quantity unit acquisition module, a heat output acquisition module and an efficiency calculation module;
an oil quantity unit acquisition module for acquiring an inlet flow C of an automobile engine oil quantity i ；
The heat output acquisition module is used for detecting the engine to acquire the heat output rate Q of the engine i (ii) a Calculating and obtaining fuel combustion efficiency
Wherein R is the fuel calorific value.
4. The intelligent detecting and diagnosing system for motor vehicle exhaust according to claim 3, wherein the heat output acquiring module comprises a temperature detecting module, an expansion work sensing module, an ignition sensing module, a heat calculating module and an efficiency calculating module; the ignition induction module is used for calibrating ignition; the expansion work induction module is used for inducing t before ignition 1 T a preset time period after ignition 2 Output power p of i (ii) a The temperature detection module is used for sensing the pre-ignition t inside the fuel cylinder 1 Temperature T of 1 And a preset time period after ignition t 2 Temperature T of 2 (ii) a t1 is the time point before ignition, t2 is the time point after ignition, and the interval between the ignition time and t2 is the preset time period; the heat calculating module is used for calculating the heat output rate Q i =Cm(T 2 -T 1 )+p i Wherein C is a known amount and m is a fixed amount; efficiency calculationThe module is used for calculating the fuel combustion efficiency
。
5. The system of claim 1, further comprising a maintenance recommendation module, wherein the maintenance recommendation module is configured to obtain the recommended content and obtain the maintenance recommended content by searching a preset type-recommendation information table according to the damage type.
6. The system according to claim 1, wherein the system further comprises: the damage standard value building module is used for building an early warning prompt standard value according to the damage type
Wherein f is a damage numerical value, and b is an early warning factor;
the damage prediction module is used for detecting and obtaining the current damage value f 'and judging whether f' exceeds f Watch (A) And if so, training and predicting the damage time according to the neural network model.
7. The system of claim 5, wherein the recommended maintenance content includes one or more of maintenance time, maintenance money, and maintenance method.
8. An intelligent detection and diagnosis method for motor vehicle exhaust, which is applied to the intelligent detection and diagnosis system for motor vehicle exhaust of any one of claims 1 to 7, and is characterized by comprising the following steps:
s1, detecting the automobile and obtaining the fuel combustion efficiency P i ；
S2, detecting and obtaining the working temperature of the engine;
s3, detecting and obtaining each component Z of the automobile exhaust i And the concentrations c corresponding to the respective components i ；
S4, acquiring the current vehicle acceleration condition;
s5, acquiring the current vehicle load ratio;
s6, searching a preset load ratio, temperature, fuel combustion efficiency, acceleration and automobile exhaust-damage information table to obtain the damage type and the corresponding probability G i ；
S7, searching a preset damage type-weight value information table to obtain the corresponding damage weight value W i ；
S8, calculating and obtaining an evaluation risk value
And sorting according to the risk values from large to small, and recommending.
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| CN105604664A (en) * | 2015-12-23 | 2016-05-25 | 北京工业大学 | Vehicle emission remote monitoring system based on OBD (on-board diagnostics) detection data |
| CN108825343A (en) * | 2018-05-30 | 2018-11-16 | 赵伟 | A kind of method for maintaining of automobile exhaust emission system |
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