CN201184842Y - On-line monitoring system for car engine status - Google Patents
On-line monitoring system for car engine status Download PDFInfo
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- CN201184842Y CN201184842Y CNU2008201041422U CN200820104142U CN201184842Y CN 201184842 Y CN201184842 Y CN 201184842Y CN U2008201041422 U CNU2008201041422 U CN U2008201041422U CN 200820104142 U CN200820104142 U CN 200820104142U CN 201184842 Y CN201184842 Y CN 201184842Y
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Abstract
The utility model relates to an automotive engine state on-line monitoring system. The exhaust fluctuation signal, such as the relation between the exhaust pressure fluctuation signal and the operation of an engine, is studied by analyzing the formation and the spread of exhaust fluctuation in an engine exhaust system; the automotive engine state on-line monitoring system which can monitor the automotive engine accurately on line by adopting very few detection items is achieved based on recording and analyzing the fluctuation of the exhaust system. The system can acquire comprehensive engine behaviors with very few detection items, and detect and diagnose the trouble of the automotive engine, thus monitoring the automotive engine on line. The intelligent fluctuation detection system can be used as a powerful tool for optimization control of the engine, which is very potential for trouble diagnosis, optimization control and noise control of automotive engines.
Description
(1) technical field:
The utility model relates to a kind of engine condition monitoring system, particularly a kind of car engine state on-line monitoring system.
(2) background technology:
Motor car engine is very complicated mechanical, electrical, a liquid systems, form by two great institutions (toggle, valve actuating mechanism) and five big systems (fuel supply system, cooling system, lube system, igniting system, cranking system), its fault also is of a great variety, relation between phenomenon of the failure and the reason also is a numerous and complicated, may be the relation of one-to-many, many-one or multi-to-multi.Different faults show in a different manner, therefore, select which type of detected object, detect which parameter, and how to carry out signal analysis and data processing is the subject matter that status monitoring and fault diagnosis will solve.
Traditional engine performance detection is the duty to each system of engine, static state and dynamic parameter as igniting, oil spout, electric-control system and sensing element and air inlet system and exhaust system and machine work state etc. are analyzed, for engine condition is judged and fault diagnosis provides scientific basis.
Along with popularizing of automobile, the development of automotive electronic technology, the duty of utilizing electronic equipment to monitor motor car engine in real time is an inexorable trend.Because the quality of motor car engine working condition is directly connected to the efficient of engine and the pollution level problem of exhaust; And monitor the operating mode of engine before breaking down in time the reasonable maintenance and even the vehicle safety travel of engine all had important meaning.
The test point and the monitoring variable of present engine all-round property testing are generally chosen cylinder body (cylinder cap) vibration, high pressure pipe pressure ripple, cylinder pressure and exhaust gas composition etc., and forefathers have done many researchs in these areas and also obtained many achievements.But because sensor is installed trouble, work under bad environment, reasons such as system's versatility difference are difficult to obtain actual application.Simultaneously because detection, the diagnostic system of available engine, its signal source is mainly taken from engine start procedure parameter, ignition wave form, intake manifold vacuum waveform, engine speed, cylinder body vibration, electronic control injection procedure parameter and exhaust gas composition or the like, cause parameter that the engine all-round property testing need detect nearly 70 multinomial, the use sensor is more, the systematic comparison bulky complex, need to be equipped with computing machine and relevant test and evaluation software thereof, have only the vehicle inspection and test station or the general overhaul factory of specialty just to use, be not suitable for being installed in and carry out on-line monitoring on the automobile.In order to realize the on-line monitoring of engine, realize that as how less test item engine monitoring accurately and fault diagnosis are to realize that high-efficiency vehicle-mounted system at first needs the problem that solves.
(3) utility model content:
The utility model be for solve in the existing motor car engine detection system test point and monitoring variable too much, sensor installs difficulty, can't realize problem such as vehicle-mounted on-line monitoring.By analyzing the formation and the propagation of exhaust fluctuation in the engine exhaust system, research exhaust fluctuation signal, for example relation between discharge pressure fluctuation signal and the engine operation; On the basis of the fluctuation of writing down and analyze exhaust system, draw a kind of car engine state on-line monitoring system that adopts few test item just can realize the on-line monitoring of motor car engine exactly.
The car engine state on-line monitoring system that the utility model is designed comprises as lower module constituting:
Data acquisition module: comprise the sensor that is used for engine collection exhaust fluctuation signal in the course of the work;
Data processing module: link to each other with data acquisition module, the signal of data acquisition module output is handled, separation or extraction characteristic quantity output to pattern recognition module as characteristic parameter or critical parameter;
Exhaust fluctuation signal database: comprise the critical parameter of engine in the exhaust fluctuation of normal condition;
Pattern recognition module: the signal output part with exhaust fluctuation signal database and data processing module links to each other respectively, by the characteristic parameter of comparing data processing module gained and the critical parameter of exhaust fluctuation signal database, draws result of determination;
Control module: total system work is coordinated in control, and is responsible for the output result of determination.
The dynamic performance of the gas stream of pipeline gas can directly reflect the situation of the pipeline or the cavity of fluid process.The dynamics of the waste gas that engine is discharged is subjected to the effect of boundary conditions of mixed gas combustion process and cavity of flowing through and gas exhaust duct, and it can directly reflect the working condition of the annexes such as fuel injector, vent valve, spark plug of engine.Utilize the dynamic perfromance of exhaust airstream to go to analyze the motion and the fault in generation source, not only the collection of signal is more convenient, and can just can obtain comparatively comprehensively engine working conditions, thereby make the vehicle-mounted on-line monitoring of the easier technically realization of monitoring of engine with less detection limit.
As improvement, the pattern recognition module of described system also comprises fault detection module, also comprises the critical parameter of engine at the exhaust fluctuation signal of different faults state in the Dui Ying exhaust fluctuation signal database with it; Fault detection module is used to the fault type of judging that engine is nonserviceabled.
As further improvement, the output terminal of the pattern recognition module of described system is used to store the memory module of the exhaust fluctuation signal that can't detect fault type, the signal that can't detect is waited until the later stage and is carried out further signal Processing and analysis, with the usefulness as system upgrade.The output terminal of memory module can link to each other with control module, in the direct input control system of the signal that can't detect; Or unsettled, wait until the later stage and carry out signal extraction during system upgrade.
The dynamics of described exhaust fluctuation gas stream is gathered by pressure transducer.In order effectively to gather the engine exhaust fluctuation signal, described sensor is positioned at the inboard of automobile exhaust pipeline.For further reducing requirement to sensor, reduce sensor installation and maintenance difficulty, make the check point of choosing can obtain monitoring variable more accurately, described sensor is arranged at the end of the middle part or the gas exhaust duct inboard of automobile exhaust pipeline inboard.The inboard of gas exhaust duct is provided with noise reducer, as in order to improve the detectability of sensor, pressure transducer can be positioned at before the noise reducer; As in order to reduce cost, make things convenient for the installation of sensor, pressure transducer can be positioned at after the noise reducer.
The exhaust fluctuation signal of described pressure transducer collection is an exhaust pressure wave, and this exhaust pressure wave comprises frequency and the amplitude that is changing along with engine behavior.
The output terminal of the described control module of the utility model car engine state on-line monitoring system also is connected to warning device and/or expansion interface.Warning device can be reported to the police and stop when emergency occurring automatically, reports to the police prompting and record correlation parameter when occurring needing to pay close attention to fault when catastrophic failure occurring.
Described expansion interface comprise make man-machine interface that system links to each other with the automotive interior control system and/or with the bus interface of remote diagnostic center communication.
The utility model compared with prior art, its advantage is:
1, the dynamic performance of gas stream can extract easily, compares the easier realization of other detection mode, and cost is also lower;
2, the installation of sensor is more convenient, efficiently solves sensor work under bad environment of living in the prior art simultaneously and the problems such as system stability difference that cause;
3, can obtain more comprehensive engine operating condition with less detection limit, compact system design is easy to be embodied as onboard system;
4, system becomes a unit of automotive interior net also by other Auto Electronic Controlled System interconnection such as bussing technique and engine Centralized Controller;
5, system not only can be used as the strong instrument of engine optimization control, also can fit by software transplanting, is used for the engine and the different application occasion of other type;
6, the system interface type can be by the demand setting, thereby makes that the versatility of system is stronger, aspect the noise control of fault diagnosis, optimal control and the motor car engine of internal combustion engine long-range application prospect is being arranged.
(4) description of drawings:
Fig. 1 is a kind of system's composition diagram of implementing embodiment of the utility model;
Fig. 2 is a kind of exhaust pressure wave synoptic diagram of engine normal condition;
Fig. 3 is the exhaust pressure wave synoptic diagram that a kind of engine 3# cylinder lacks fiery malfunction;
The exhaust pressure wave synoptic diagram that Fig. 4 collects in operational process for a kind of engine.
(5) embodiment:
Be illustrated in figure 1 as a kind of system's composition diagram of implementing embodiment of the utility model car engine state on-line monitoring system.System comprises data acquisition module, data processing module, discharge pressure fluctuation frequency spectrum storehouse, pattern recognition module, fault detection module and control module.
Below a kind of system's composition and principle of work of implementing embodiment of the utility model car engine state on-line monitoring system is elaborated:
Data acquisition module is a pressure transducer by the inboard that is positioned at automobile exhaust pipeline.This pressure transducer is as being positioned at the front end of noise reducer and catalyst, can the sensitive signal that captures pressure surge, effectively improve the detectability of system; Be positioned at as pressure transducer after the parts such as noise reducer and catalyst, can conveniently install, reduce cost.Native system is taked the mode of pressure transducer between noise reducer and catalyst, so promptly can guarantee the monitoring capability of pressure transducer, less fault can be differentiated by the system that makes, also relatively low to the requirement of sensor simultaneously, thus make the also corresponding reduction of cost, install also corresponding easily.The initialize signal with exhaust pressure wave that pressure transducer will collect is converted into easy-to-handle signal and outputs to and carry out signal Processing in the data processing module.
The spectrum component that data processing module is sent into signal to the data acquisition module is handled, and separates or extracts characteristic quantity as critical parameter or characteristic parameter.
At the beginning of system sets up, in embedded system, set up a discharge pressure fluctuation frequency spectrum storehouse in advance.Its concrete steps are by analyzing the formation and the propagation of engine exhaust system internal pressure ripple, the relation between research discharge pressure fluctuation frequency spectrum and the engine operation.At first gather the exhaust pressure wave of engine exhaust by pressure transducer, analysis by data acquisition module and signal Processing with exhaust system at the discharge pressure fluctuation frequency spectrum of normal condition and engine discharge pressure fluctuation frequency spectrum, and with the discharge pressure frequency spectrum input data processing module that fluctuates in malfunctions such as the catching fire of cylinder, vent valve wearing and tearing.Data processing module carries out signal Processing, separation to frequency spectrum or extracts characteristic quantity being recorded in the embedded system after as critical parameter.This critical parameter comprises the critical parameter of the critical parameter of engine under the critical parameter malfunction under normal condition and the malfunction.The process of the foundation of the critical parameter in the discharge pressure fluctuation frequency spectrum storehouse is an accumulative process gradually, the order of severity according to fault, the frequency spectrum of Cai Jiing will comprise that at first the engine individual cylinder catches fire in advance, the critical parameter during engine most common failures such as the work sequence of indivedual vent valves and wearing and tearing.Along with the operation of automobile, increase critical parameter gradually, the type of the fault that can differentiate with expanding system.
When automobilism, online acquisition engine exhaust pressure wave in the course of the work, and collecting exhaust pressure wave carried out signal Processing at data acquisition module and data processing module, separate or extract characteristic parameter after the input pattern identification module carry out pattern-recognition.Described mode identification procedure is judged the operating mode of engine promptly by comparative feature parameter and critical parameter.It comprises simple mode identifying and complex patterns identifying.The simple mode identifying is to judge the abnormal process of the normal mistake of engine, and its concrete steps are that the fluctuate critical parameter of frequency spectrum of the discharge pressure with engine normal condition in the characteristic parameter of exhaust pressure wave and the discharge pressure fluctuation frequency spectrum storehouse compares.By comparing, when finding that characteristic parameter does not conform to critical parameter, system judges that engine operation is undesired.Then exhaust pressure wave is sent to the differentiation that fault detection module is carried out fault type, and starts the complex patterns identifying simultaneously.The complex patterns identifying is to judge there is the process of which kind of fault in engine, its concrete steps are that exhaust pressure wave is further carried out signal Processing, separates or extracts characteristic quantity as characteristic parameter, and the cylinder that prestores in the characteristic parameter after will handling once more and the discharge pressure fluctuation frequency spectrum storehouse catch fire and the critical parameter of two kinds of malfunctions of vent valve wearing and tearing compares one by one.When the critical parameter of a certain fault of storing conforms to, judge that then this fault appears in engine when characteristic parameter fluctuates the frequency spectrum storehouse with discharge pressure in; When the critical parameter of any fault of storing when characteristic parameter fluctuates the frequency spectrum storehouse with discharge pressure in does not all conform to, then this exhaust pressure wave is recorded in the memory module of embedded system, wait until the further analysis and research in later stage, to be used for expanding the fault type in discharge pressure fluctuation frequency spectrum storehouse.The output terminal of described memory module can be unsettled or be linked to each other with the output terminal of control module.The output terminal of the memory module of present embodiment is unsettled, by regularly the exhaust pressure wave of storing in the memory module that can't judge further being analyzed, separate or extract critical parameter after implant discharge pressure fluctuation frequency spectrum storehouse, the decidable fault type that makes discharge pressure fluctuation frequency spectrum storehouse be stored progressively increases.
The output terminal of data processing module also links to each other with control module.Total system work is coordinated in control, and is responsible for the output result of determination.The output terminal of the control module of system also is connected to warning device and expansion interface.Warning device can be reported to the police and stop when emergency occurring automatically, reports to the police prompting and record correlation parameter when occurring needing to pay close attention to fault when catastrophic failure occurring.Expansion interface comprises man-machine interface and bus interface, and system and automotive interior control system and remote diagnostic center are connected by communication, and makes it to become a unit of automotive interior net.
In conjunction with above-mentioned principle of work, below a kind of course of work of implementing embodiment of the utility model car engine state on-line monitoring system is carried out brief description:
The system of this practical embodiment sets up the initial stage, and pressure transducer is gathered the exhaust pressure wave of engine normal condition respectively, as the exhaust pressure wave of Fig. 2 and the scarce fiery malfunction of each cylinder, as Fig. 3, is used to set up discharge pressure fluctuation frequency spectrum storehouse.At first, above-mentioned two exhaust pressure waves are sent to respectively carry out signal Processing in the data acquisition module, it is converted into the original pressure electric signal that pressure transducer is collected easy-to-handle electric signal and outputs in the data processing module.Secondly, data processing module is handled the spectrum component of signal, isolate characteristic quantity and deposit in the embedded system after as critical parameter, set up a discharge pressure fluctuation frequency spectrum storehouse that includes the discharge pressure fluctuation frequency spectrum of engine normal condition and the discharge pressure fluctuation frequency spectrum that each cylinder lacks fiery malfunction.
When engine moved, pressure transducer was gathered the exhaust pressure wave of engine in operational process, as Fig. 4.At first, exhaust pressure wave is sent to carries out signal Processing in the data acquisition module, it is converted into the original pressure electric signal that pressure transducer is collected easy-to-handle electric signal and outputs in the data processing module.Secondly, signal carries out spectrum component in data processing module handles, and after signal transformation and sampling, extracts characteristic quantity as characteristic parameter, sends into pattern recognition module and fault detection module.Once more, by the critical parameter of the normal condition in comparative feature parameter and the exhaust surge pressure fluctuation frequency spectrum storehouse, pattern recognition module finds that characteristic parameter does not conform to critical parameter, therefore judges that there is fault in engine.Start the complex patterns identifying this moment, promptly the exhaust pressure wave that collects in the operational process carried out further signal spectrum and become divisional processing, extracts the malfunction characteristic parameter.Then, in fault detection module, the characteristic parameter that each cylinder in malfunction characteristic parameter and the discharge pressure fluctuation frequency spectrum storehouse is lacked fiery malfunction compares one by one, find that malfunction characteristic parameter and 3# cylinder lack fiery fault and conform to, judge that there is scarce fiery fault in engine 3# cylinder this moment.At last, result of determination is outputed in the control module, the warning device that the output terminal of this control module is connected to sends warning, and the man-machine interface that is connected to by the output terminal with engine control module and the control system of automotive interior, and Control of Automobile is stopped.
Above-mentioned embodiment is not the exhaustive of the utility model car engine state on-line monitoring system.The utility model can also come the combustion case of detection of engine by the fluctuation that detects exhaust gas composition in conjunction with other exhaust detecting sensor (such as lambda sensor etc.), forms a comprehensive engine intelligent supervisory system.
Claims (9)
1, car engine state on-line monitoring system is characterized in that: comprise
Data acquisition module: comprise the sensor that is used for engine collection exhaust fluctuation signal in the course of the work;
Data processing module: link to each other with data acquisition module, data acquisition module output signal is handled, separation or extraction characteristic quantity output to pattern recognition module as characteristic parameter or critical parameter;
Exhaust fluctuation signal database: comprise the critical parameter of engine at the exhaust fluctuation signal of normal condition;
Pattern recognition module: the signal output part with exhaust fluctuation signal database and data processing module links to each other respectively, and the critical parameter by comparative feature parameter and exhaust fluctuation signal database draws result of determination;
Control module: total system work is coordinated in control, and is responsible for the output result of determination.
2, car engine state on-line monitoring system according to claim 1, it is characterized in that: also comprise fault detection module in the described pattern recognition module, also comprise the critical parameter of engine in the Dui Ying exhaust fluctuation signal database with it at the exhaust fluctuation signal of different faults state; Fault detection module is used to judge the breakdown in the motor type.
3, car engine state on-line monitoring system according to claim 2 is characterized in that: the output terminal of described pattern recognition module also is connected to the memory module that is used to store the exhaust fluctuation signal data that can't detect fault type.
4, car engine state on-line monitoring system according to claim 1 is characterized in that: described sensor is a pressure transducer.
5 according to claim 1 or 4 described car engine state on-line monitoring systems, and it is characterized in that: described sensor is positioned at the inboard of automobile exhaust pipeline.
6, car engine state on-line monitoring system according to claim 5, it is characterized in that: described sensor is arranged at the end of the middle part or the gas exhaust duct inboard of automobile exhaust pipeline inboard, the inboard of this gas exhaust duct is provided with noise reducer, and pressure transducer is positioned at before or after the noise reducer.
7, car engine state on-line monitoring system according to claim 4 is characterized in that: the signal of described pressure transducer collection is an exhaust pressure wave.
8, according to any described car engine state on-line monitoring system in the claim 1～3, it is characterized in that: the output terminal of described control module also is connected to warning device and/or expansion interface.
9, car engine state on-line monitoring system according to claim 8 is characterized in that: described expansion interface comprise make man-machine interface that system links to each other with the automotive interior control system and/or with the bus interface of remote diagnostic center communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201041422U CN201184842Y (en) | 2008-03-20 | 2008-03-20 | On-line monitoring system for car engine status |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201041422U CN201184842Y (en) | 2008-03-20 | 2008-03-20 | On-line monitoring system for car engine status |
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| CN201184842Y true CN201184842Y (en) | 2009-01-21 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620948A (en) * | 2012-04-03 | 2012-08-01 | 广州蓄能水电厂 | Intelligent pump storage machine set fault analysis method and system thereof |
| CN104931264A (en) * | 2015-06-11 | 2015-09-23 | 滁州市西控电子有限公司 | Novel engine data acquisition and monitoring system |
| JP2019053059A (en) * | 2017-09-13 | 2019-04-04 | エーブイエル・テスト・システムズ・インコーポレイテッド | System and method for determining whether engine is in on-state or in off-state according to pressure of exhaust gas generated by engine |
| CN114459762A (en) * | 2020-12-25 | 2022-05-10 | 北京天兵科技有限公司 | Rocket engine health state diagnosis system and method |
-
2008
- 2008-03-20 CN CNU2008201041422U patent/CN201184842Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620948A (en) * | 2012-04-03 | 2012-08-01 | 广州蓄能水电厂 | Intelligent pump storage machine set fault analysis method and system thereof |
| CN104931264A (en) * | 2015-06-11 | 2015-09-23 | 滁州市西控电子有限公司 | Novel engine data acquisition and monitoring system |
| JP2019053059A (en) * | 2017-09-13 | 2019-04-04 | エーブイエル・テスト・システムズ・インコーポレイテッド | System and method for determining whether engine is in on-state or in off-state according to pressure of exhaust gas generated by engine |
| JP7114422B2 (en) | 2017-09-13 | 2022-08-08 | エーブイエル・テスト・システムズ・インコーポレイテッド | A system and method for determining whether an engine is on or off based on the pressure of exhaust gases produced by the engine |
| CN114459762A (en) * | 2020-12-25 | 2022-05-10 | 北京天兵科技有限公司 | Rocket engine health state diagnosis system and method |
| CN114459762B (en) * | 2020-12-25 | 2024-02-23 | 北京天兵科技有限公司 | Rocket engine health state diagnosis system and method |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090121 Termination date: 20110320 |