CN114856879A - Diesel engine nozzle device capable of being used for combustion state online monitoring and detection method - Google Patents
Diesel engine nozzle device capable of being used for combustion state online monitoring and detection method Download PDFInfo
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- CN114856879A CN114856879A CN202210376128.2A CN202210376128A CN114856879A CN 114856879 A CN114856879 A CN 114856879A CN 202210376128 A CN202210376128 A CN 202210376128A CN 114856879 A CN114856879 A CN 114856879A
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- ion current
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- combustion state
- nozzle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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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
- 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)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention provides a diesel engine nozzle device and a detection method for online monitoring of a combustion state, wherein the nozzle device specifically comprises an oil nozzle, an ion current monitoring probe, a bias voltage source, a booster circuit module, a data acquisition module, an ion current generation module, an operational amplifier, a signal conditioning module and a detection module; the oil nozzle is connected with a bias voltage source; the ion current monitoring probe is integrated in the oil nozzle; the boosting circuit module boosts a bias voltage source; the ion current generation module generates ion current in a combustion state; the data acquisition module acquires an ion current signal; the operational amplifier amplifies the ion current signal at the output end of the signal; the signal conditioning module converts the ion current signal into a voltage signal; the detection module detects the voltage signal; the invention does not need to process any additional detection hole on the cylinder cover of the engine, furthest retains the original structure of the engine and simultaneously increases the universality of the invention.
Description
Technical Field
The invention belongs to the field of power machinery, and particularly relates to a diesel engine nozzle device and a detection method for online monitoring of a combustion state.
Background
With the increasing quantity of automobiles, the problems of environmental pollution and energy crisis caused by automobiles become more serious. The internal combustion engine is a main power source of an automobile, and in order to improve the combustion and emission performance of the internal combustion engine, more precise and real-time analysis and control of the combustion process of the internal combustion engine are urgently needed.
With the improvement of the requirements on the power performance and the emission standard of the engine, the engine models newly released by various large host manufacturers and research institutions are all covered by high thermal efficiency and advanced electric control technology labels. High thermal efficiency, low emissions can be achieved by using advanced combustion and aftertreatment technologies, and control of the combustion process is critical to full engine performance.
In the field of engine electronic control, how to accurately and cost-effectively detect basic parameters in the operation of an engine is the most basic problem, and particularly the monitoring of in-cylinder combustion state. This requires many sensors to be installed on the engine, and one of the more important sensors is the cylinder pressure sensor, but this will certainly increase the cost of the engine, and in the worst case, the combustion performance of the engine will be affected because the installation of the cylinder pressure sensor will change the volume of the combustion chamber to affect the compression combustion process of the engine.
Therefore, the in-cylinder detection and closed-loop control technology of the internal combustion engine becomes a new research focus. For the combustion state on-line monitoring technology of the internal combustion engine, the combustion state monitoring using the in-cylinder pressure as the feedback information is most commonly adopted at present. However, this technique requires punching through the engine head to form the sensor mounting hole. This test method is therefore an invasive test, which, although with high precision, is irreversible to damage the engine structure. Therefore, finding a combustion state sensor that can be mounted on an in-cylinder actuator is an important research item for realizing monitoring of the combustion state.
By carrying out theoretical analysis on chemical ionization and thermal ionization reactions in the combustion process of the internal combustion engine, the ion current formed in the combustion process of the internal combustion engine is known. The combustion information of the current cycle can be obtained by collecting the ion current generated in the combustion process. The ion current sensor most commonly used at present is mounted on an electrode of a spark plug. The structure does not need to process redundant detection holes on the cylinder cover. And the firm outer geometrical structure of the spark plug ensures the structural reliability of the sensor. However, for diesel engines, the cylinder head does not have a spark plug device and any existing electrode structure. Therefore, in order to solve the problem, the invention provides an ion current sensor carried on a diesel engine nozzle, and a set of complete combustion state feedback system is formed on the basis of the ion current sensor.
Disclosure of Invention
The invention provides a diesel engine nozzle device and a detection method for realizing real-time monitoring of a combustion state of a diesel engine and ensuring that the original structure of the diesel engine is not changed.
The invention is realized by the following technical scheme:
a diesel engine nozzle device for on-line monitoring of combustion state comprises:
the nozzle device specifically comprises an oil nozzle 7, an ion current monitoring probe, a bias voltage source, a booster circuit module, a data acquisition module, an ion current generation module, an operational amplifier, a signal conditioning module and a detection module;
the oil nozzle 7 is connected with a bias voltage source;
the ion current monitoring probe is integrated in the oil nozzle 7;
the boosting circuit module boosts a bias voltage source;
the ion current generation module generates ion current in a combustion state;
the data acquisition module acquires an ion current signal;
the operational amplifier amplifies the ion current signal at the output end of the signal;
the signal conditioning module converts the ion current signal into a voltage signal;
and the detection module detects the voltage signal to finish the detection of the ion current in the combustion state.
Further, the ion current monitoring probe comprises a probe anode 1, a probe cathode, a ceramic insulator 2, a nozzle shell 3 and a signal external lead 4;
the probe anode 1 is connected with a signal outer lead 4; the signal outer lead 4 is connected with the data acquisition module;
the signal outer lead 4 provides bias voltage for the ion current monitoring probe and the oil nozzle 7.
Further, the oil nozzle 7 serves as a negative electrode of the nozzle device, and the ion current monitoring probe serves as a positive electrode of the nozzle device;
the oil jet 7 is insulated from the engine housing by a ceramic insulator 3.
A detection method of a diesel engine nozzle device for online monitoring of a combustion state comprises the following steps:
in a combustion state, the boosting circuit module boosts the bias voltage source; the charged ions are subjected to the action of an electric field force of a bias voltage source between an ion current anode 6 and an ion power cathode 5 of the ion current generation module to move directionally so as to generate ion current;
the data acquisition module acquires an ion current signal; the operational amplifier amplifies the ion current signal at the output end of the signal;
the signal conditioning module converts the ion current signal into a voltage signal; the detection module detects the voltage signal to finish the detection of the ion current in the combustion state.
An electronic device comprising a memory storing a computer program and a processor implementing the steps of any of the above methods when the processor executes the computer program.
A computer readable storage medium storing computer instructions which, when executed by a processor, implement the steps of any of the above methods.
The invention has the beneficial effects
The nozzle structure provided by the invention can directly use the diesel engine nozzle as a detection sensor of ionic current, so that no additional detection hole is required to be processed on the engine cylinder cover, the original structure of the engine is retained to the maximum extent, and meanwhile, the universality of the invention is also improved; the non-invasive test of the combustion state in the cylinder of the diesel engine is realized;
compared with the most commonly adopted cylinder pressure monitoring method of the existing diesel engine, the method provided by the invention does not need a piezoelectric crystal unit, so that the cost is lower and the reliability is higher.
Drawings
FIG. 1 is a schematic view of a nozzle integrated ion current sensor according to the present invention;
FIG. 2 illustrates the principle of ion current generation and detection according to the present invention;
FIG. 3 is a block diagram of the system assembly of the present invention;
FIG. 4 is an arrangement of the probe of the present invention within an engine cylinder;
the device comprises a probe anode 1, a ceramic insulator 2, a nozzle shell 3, a signal external lead 4, an ion power cathode 5, an ion current anode 6, an oil nozzle 7 and a combustion chamber 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
With reference to fig. 1 to 4.
A diesel engine nozzle device for on-line monitoring of combustion state comprises:
the nozzle device specifically comprises an oil nozzle 7, an ion current monitoring probe, a bias voltage source (only by directly adopting the voltage of a storage battery in the vehicle), a booster circuit module, a data acquisition module, an ion current generation module, an operational amplifier, a signal conditioning module and a detection module;
the oil nozzle 7 is connected with a bias voltage source;
the ion current monitoring probe is integrated in the oil nozzle 7;
the ion current generation module generates ion current in a combustion state;
the boosting circuit module boosts a bias voltage source;
the ion current generation module generates ion current in a combustion state;
the data acquisition module acquires an ion current signal;
because the ion current signal is relatively weak, the ion current signal is amplified at the output end of the signal through an operational amplifier;
the signal conditioning module converts the ion current signal into a voltage signal;
and the detection module detects the voltage signal to finish the detection of the ion current in the combustion state.
The ion current monitoring probe comprises a probe anode 1, a probe cathode, a ceramic insulator 2, a nozzle shell 3 and a signal outer lead 4;
as shown in fig. 1 and 3, the probe anode 1 is connected with a signal outer lead 4; the signal outer lead 4 is connected with the data acquisition module;
the signal outer lead 4 provides bias voltage for the ion current monitoring probe and the oil nozzle 7.
The oil sprayer body is directly contacted with the engine shell and has the same electromotive force, the oil spray nozzle 7 is used as the cathode of the nozzle device, and the ion current monitoring probe is used as the anode of the nozzle device;
since the ion current monitoring probe has a voltage of approximately 500V to the ground (engine casing), the oil jet 7 is insulated from the engine casing by the ceramic insulator 3.
The specific working process of the invention is shown in fig. 2, when fuel is burnt in the cylinder, charged ions can be generated, and the charged ions are subjected to the action of an electric field force between the ion current anode 6 and the ion power cathode 5 to generate ion current. These ions are directly generated by combustion, and the number and charge amount of the ions contain abundant combustion state information. The charged ions are directionally moved by an external electric field to generate ion current, and the intensity and the change process of the current are detected by an external detection circuit to realize the detection of the combustion state.
The arrangement of the ion current detection probe in the engine cylinder is shown in fig. 4.
A detection method of a diesel engine nozzle device for online monitoring of a combustion state comprises the following steps:
in a combustion state, the boosting circuit module boosts the bias voltage source; the charged ions are subjected to the action of an electric field force of a bias voltage source between an ion current anode 6 and an ion power cathode 5 of the ion current generation module to move directionally so as to generate ion current;
the data acquisition module acquires an ion current signal; the operational amplifier amplifies the ion current signal at the output end of the signal;
the signal conditioning module converts the ion current signal into a voltage signal; the detection module detects the voltage signal to finish the detection of the ion current in the combustion state.
An electronic device comprising a memory storing a computer program and a processor implementing the steps of any of the above methods when the processor executes the computer program.
A computer readable storage medium storing computer instructions which, when executed by a processor, implement the steps of any of the above methods.
The diesel engine nozzle device and the detection method for online monitoring of the combustion state, which are provided by the invention, are described in detail above, and the principle and the implementation mode of the invention are explained, and the description of the above embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. The utility model provides a diesel engine nozzle device that can be used to combustion state on-line monitoring which characterized in that:
the nozzle device specifically comprises an oil nozzle (7), an ion current monitoring probe, a bias voltage source, a booster circuit module, a data acquisition module, an ion current generation module, an operational amplifier, a signal conditioning module and a detection module;
the oil nozzle (7) is connected with a bias voltage source;
the ion current monitoring probe is integrated in the oil nozzle (7);
the boosting circuit module boosts a bias voltage source;
the ion current generation module generates ion current in a combustion state;
the data acquisition module acquires an ion current signal;
the operational amplifier amplifies the ion current signal at the output end of the signal;
the signal conditioning module converts the ion current signal into a voltage signal;
and the detection module detects the voltage signal to finish the detection of the ion current in the combustion state.
2. The nozzle arrangement of claim 1, wherein:
the ion current monitoring probe comprises a probe anode (1), a probe cathode, a ceramic insulator (2), a nozzle shell (3) and a signal outer lead (4);
the probe anode (1) is connected with a signal outer lead (4); the signal outer lead (4) is connected with the data acquisition module;
the signal outer lead (4) provides bias voltage for the ion current monitoring probe and the oil nozzle (7).
3. The nozzle arrangement of claim 2, wherein:
the oil nozzle (7) is used as the cathode of the nozzle device, and the ion current monitoring probe is used as the anode of the nozzle device;
the oil nozzle (7) is insulated from the engine shell through a ceramic insulator (3).
4. A detection method of a diesel engine nozzle device for online monitoring of a combustion state is characterized by comprising the following steps:
in a combustion state, the boosting circuit module boosts the bias voltage source; the charged ions are subjected to directional movement between an ion current anode (6) and an ion power cathode (5) of the ion current generation module under the action of an electric field force of a bias voltage source to generate ion current;
the data acquisition module acquires an ion current signal; the operational amplifier amplifies the ion current signal at the output end of the signal;
the signal conditioning module converts the ion current signal into a voltage signal; the detection module detects the voltage signal to finish the detection of the ion current in the combustion state.
5. An electronic device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of claim 4 when executing the computer program.
6. A computer readable storage medium storing computer instructions which, when executed by a processor, perform the steps of the method of claim 4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210376128.2A CN114856879B (en) | 2022-04-11 | 2022-04-11 | Diesel engine nozzle device capable of being used for combustion state online monitoring and detection method |
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| CN202210376128.2A CN114856879B (en) | 2022-04-11 | 2022-04-11 | Diesel engine nozzle device capable of being used for combustion state online monitoring and detection method |
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| CN114856879A true CN114856879A (en) | 2022-08-05 |
| CN114856879B CN114856879B (en) | 2023-04-07 |
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Citations (10)
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| US6336355B1 (en) * | 1999-08-30 | 2002-01-08 | Mitsubishi Denki Kabushiki Kaisha | Combustion condition detecting apparatus for an internal combustion engine |
| US20040089056A1 (en) * | 2002-11-08 | 2004-05-13 | Mitsubishi Denki Kabushiki Kaisha | Knock detection apparatus for internal combustion engine |
| US20050092287A1 (en) * | 2003-10-31 | 2005-05-05 | Woodward Governor Company | Method and apparatus for detecting ionization signal in diesel and dual mode engines with plasma discharge system |
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| US20160025060A1 (en) * | 2013-03-11 | 2016-01-28 | Wayne State University | Predictive correction in internal combustion engines |
| CN110226033A (en) * | 2016-11-22 | 2019-09-10 | Ic有限责任公司 | Spark plug burning ionization transducer |
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2022
- 2022-04-11 CN CN202210376128.2A patent/CN114856879B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5611314A (en) * | 1994-10-26 | 1997-03-18 | Toyota Jidosha Kabushiki Kaisha | Control device for internal combustion engine |
| US5861551A (en) * | 1997-02-07 | 1999-01-19 | Mitsubishi Denki Kabushiki Kaisha | Combustion state detecting apparatus for an internal-combustion engine |
| US6336355B1 (en) * | 1999-08-30 | 2002-01-08 | Mitsubishi Denki Kabushiki Kaisha | Combustion condition detecting apparatus for an internal combustion engine |
| US20040089056A1 (en) * | 2002-11-08 | 2004-05-13 | Mitsubishi Denki Kabushiki Kaisha | Knock detection apparatus for internal combustion engine |
| US20050092287A1 (en) * | 2003-10-31 | 2005-05-05 | Woodward Governor Company | Method and apparatus for detecting ionization signal in diesel and dual mode engines with plasma discharge system |
| US20140232414A1 (en) * | 2011-07-15 | 2014-08-21 | Tamer H. Badawy | Simultaneous ion sensing and gas sampling in combustion engine cylinders and other combustion systems |
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| US20160025060A1 (en) * | 2013-03-11 | 2016-01-28 | Wayne State University | Predictive correction in internal combustion engines |
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| CN110226033A (en) * | 2016-11-22 | 2019-09-10 | Ic有限责任公司 | Spark plug burning ionization transducer |
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| CN114856879B (en) | 2023-04-07 |
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