CN109149377B - Method for refitting CNG ignition system and CNG ignition system - Google Patents
Method for refitting CNG ignition system and CNG ignition system Download PDFInfo
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- CN109149377B CN109149377B CN201811046886.8A CN201811046886A CN109149377B CN 109149377 B CN109149377 B CN 109149377B CN 201811046886 A CN201811046886 A CN 201811046886A CN 109149377 B CN109149377 B CN 109149377B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 33
- 239000007769 metal material Substances 0.000 claims abstract description 28
- 229910000990 Ni alloy Inorganic materials 0.000 claims abstract description 14
- 239000000956 alloy Substances 0.000 claims abstract description 10
- 230000004069 differentiation Effects 0.000 claims abstract description 9
- 230000004048 modification Effects 0.000 claims abstract description 9
- 238000012986 modification Methods 0.000 claims abstract description 9
- 230000008859 change Effects 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 8
- 239000007772 electrode material Substances 0.000 claims description 7
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 238000009420 retrofitting Methods 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 3
- 229910052741 iridium Inorganic materials 0.000 claims description 3
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000002715 modification method Methods 0.000 abstract 1
- 238000012857 repacking Methods 0.000 abstract 1
- 150000002500 ions Chemical class 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010970 precious metal Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/39—Selection of materials for electrodes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P3/00—Other installations
- F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
- F02P3/04—Layout of circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/40—Sparking plugs structurally combined with other devices
- H01T13/44—Sparking plugs structurally combined with other devices with transformers, e.g. for high-frequency ignition
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Spark Plugs (AREA)
Abstract
The invention discloses a method for modifying a CNG ignition system and the CNG ignition system, wherein the modification method comprises the following steps: on the basis of an original vehicle ignition system, cylinder-divided differential modification is adopted: under the condition that original motorcycle type ignition coil does not change, make every jar spark plug into the differentiation, increase noble metal material on center electrode or side electrode according to ignition jar polarity. The invention has the advantages that: through carrying out the differentiation design with each jar spark plug, adopt the noble metal material with the spark plug side electrode head of positive pole ignition cylinder, the center electrode adopts ordinary nickel alloy material to reach both can reducing positive pole ignition cylinder inefficacy risk, simultaneously greatly reduced repacking cost.
Description
Technical Field
The invention relates to modification of an engine ignition system, in particular to a method for modifying a CNG ignition system and the CNG ignition system, which are suitable for modifying the CNG ignition system based on a traditional gasoline engine.
Background
With the gradual tightening of emission regulations, for the traditional gasoline engine, each large host factory starts to seek clean energy, and at present, two situations mainly exist, one is new energy (pure electric and hybrid), the main customer group is a private car owner, the other is natural gas fuel, and the main customer group is a taxi market.
At present, each large main engine factory CNG engine is basically reformed by a traditional gasoline engine, and compared with the ignition voltage of the traditional gasoline engine, the ignition voltage in a cylinder of the CNG engine is higher, because the environment in the cylinder of the CNG engine is worse than that of the traditional gasoline engine. Then the problem comes, what is the higher firing voltage of CNG has an effect on the ignition system?
Introduction of ignition voltage principle and influencing factors: first we say three major pieces of the ignition system: ignition coil, high-voltage line (for 1X1 overhead ignition coil, high-voltage line is not required), spark plug. The ignition coil is used for providing a high-voltage source (the operation principle of the ignition coil is that a primary low voltage is converted into a secondary high voltage by utilizing the transformer principle), the high-voltage wire is used for providing a high-voltage transmission path (for the 1X1 overhead ignition coil, the high voltage is transmitted to a spark plug through a connecting rod of the ignition coil after being output from the secondary of the ignition coil), and the spark plug is used for breaking down a gap between a central electrode and a side electrode by high voltage to form mixed gas in an arc ignition cylinder. The ignition voltage is affected by the current in-cylinder mixture in addition to the spark plug gap.
After CNG is modified, the ignition voltage is increased, particularly for ignition coils of 1X2 and 2X2, the ignition mode of a positive electrode and a negative electrode exists, the ablation rate of a side electrode of a positive electrode ignition cylinder is increased, the gap between a central electrode and the side electrode is increased, the voltage increase rate of a system is too high, and the risk of system failure is high. The conventional improvement scheme is to upgrade the ignition coil to a 1 × 1 ignition coil, and the central electrode and the side electrodes are designed by adopting noble metal materials. However, such upgrading is relatively costly, and the calibration needs to be performed again, which takes a long period. This is undesirable for most host plants to adopt this conventional improvement, but there is no other better solution. If the ignition coil is replaced and the double-expensive design of the spark plug is added, the cost of a single machine is increased, and the profit of a company is influenced; however, if the ignition system scheme of the gasoline engine is directly followed, the ignition system scheme faces the complaint of after-sales customers, and the product strength and brand image of a company are greatly influenced. So based on the current situation CNG retrofitting has met with bottlenecks.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for modifying a CNG ignition system and the CNG ignition system, which are used for improving the CNG ignition system based on the original vehicle ignition system so as to meet the requirements of the CNG ignition system and meet the requirements of the CNG ignition system on the basis of saving cost.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for modifying a CNG ignition system is characterized in that based on an original vehicle ignition system, cylinder-based differential modification is adopted: under the condition that original motorcycle type ignition coil does not change, make every jar spark plug into the differentiation, increase noble metal material on center electrode or side electrode according to ignition jar polarity.
In the negative ignition cylinder, the center electrode of the spark plug is plated with a noble metal material; in the positive ignition cylinder, the side electrodes are plated with a noble metal material.
In the negative ignition cylinder, the material of the spark plug side electrode is not changed; in the positive ignition cylinder, the center electrode material is not changed.
In the negative ignition cylinder, the material of the side electrode of the spark plug is nickel alloy material; in the positive ignition cylinder, the central electrode material is made of nickel alloy material.
In the negative ignition cylinder, the central electrode tip part of the spark plug is coated with a noble metal material; in the positive ignition cylinder, the head of the spark plug-side electrode is plated with a noble metal material.
The ignition coil of the original vehicle ignition system is a 1x2 type ignition coil or a 2x2 type ignition coil.
The noble metal material used for plating on the central electrode or the side electrode is platinum or iridium.
A CNG ignition system comprising an ignition coil providing a source of high voltage, a high voltage wire for connecting the ignition coil and a spark plug together such that high voltage electricity is transmitted to the spark plug, a center electrode and side electrodes of the spark plug forming an arc ignition fuel under high voltage breakdown, a noble metal material being added to the center electrode or the side electrodes depending on the polarity of the cylinder in which the electrodes are fired.
In the negative ignition cylinder, the center electrode of the spark plug is plated with a noble metal material; in the positive ignition cylinder, the side electrodes are plated with a noble metal material.
The ignition coil is a 1x2 type ignition coil or a 2x2 type ignition coil.
The invention has the advantages that: through the differentiated design of spark plugs of all cylinders, the head part of a spark plug side electrode of the positive ignition cylinder is made of a noble metal material, and a center electrode is made of a common nickel alloy material, so that the failure risk of the positive ignition cylinder can be reduced, and the modification cost is greatly reduced; the spark plug differential design is adopted, so that not only is the cost reduction brought to a host factory, but also the fault damage of engine parts and unpredictable dangers of a whole vehicle and a driver caused by the failure of an ignition system are effectively reduced; only the head of the electrode is plated with noble metal, so that the cost can be effectively saved, the loss is at the head during breakdown, and the effects of protection and loss reduction can be met.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
fig. 1 is a schematic view of the ignition system of a 1x1 ignition coil;
fig. 2 is a schematic diagram of the ignition system of a 1x2 type ignition coil.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
1. According to the state of the ignition system of the original vehicle type, cylinder differentiation design is carried out:
the cylinder differentiation means that spark plugs of each cylinder are differentiated under the condition that an ignition coil of an original automobile model is not changed, and under the normal condition, the spark plugs of each cylinder of an engine are the same, and performance parameters and the appearance of the engine are the same. Of course, CNG is reformed on the original gasoline engine, and the spark plugs of each cylinder can be made to be the same (performance parameters and appearance), but in order to save cost to the maximum extent, a cylinder-by-cylinder differentiation scheme is adopted. The details will be presented in the detailed description.
2. According to different polarities of the ignition cylinder, precious metal materials (common precious metal materials comprise platinum and iridium) are added on the central electrode or the side electrodes, and an ignition coil is not changed;
the negative ignition cylinder is used for optimizing the material of the central electrode of the spark plug to adopt a noble metal material to relieve the increase of an ignition gap because the central electrode is seriously burnt at the moment;
the positive electrode ignition cylinder optimizes the side electrode material, increases the precious metal material and relieves the ignition gap from increasing because the side electrode is seriously burnt at the moment;
3. only the head part of the side electrode is made of noble metal, the central electrode tip part is still made of common nickel alloy, and the market does not have the scheme, so that the protection scope of the patent is also disclosed. The wear resistance is increased by plating a noble metal material layer on the head of the electrode.
4. By adopting the design of cylinder differentiation, the ignition voltage level of each cylinder can be better balanced, the combustion system is more stable, and the modification cost (ignition coil and spark plug) is greatly reduced.
And (3) igniting the negative electrode: in brief, when the center electrode of the spark plug is negative, the corresponding spark plug side electrode is positive, and a 1 × 1 type ignition coil is taken as an example, the schematic diagram is shown in fig. 1 as follows:
upon ignition of the negative electrode, particles, one electron and one positively charged ion, are formed in the gap between the central electrode and the side electrode. At the moment, the central end is a negative electrode, the side electrode end is a positive electrode, so electrons bombard the side electrode from the central electrode, positive ions bombard the central electrode from the side electrode, and because the electron mass is very light and can be ignored, and the ion mass is relatively large, the central electrode is relatively seriously burnt when bombarding the central electrode.
And (4) positive electrode ignition: in short, the center electrode of the spark plug is positive, and the corresponding spark plug side electrode is negative. Taking the 1x2 type ignition coil as an example, the schematic diagram is shown in fig. 2 as follows:
fig. 2 shows a 1x2 ignition mode in which the ignition coil is fitted to a spark plug, and the 1x2 ignition coil has 2 high-voltage outputs, one of which transmits high voltage to the spark plug through a rubber connecting rod, and this end is referred to as positive ignition. The other high voltage output of the ignition coil delivers high voltage to the spark plug through an external high voltage lead, which end is diagrammatically referred to as positive ignition. For the negative ignition, the above is explicitly stated and will not be described in detail. For positive ignition, when the positive electrode is ignited, particles, one being electrons and one being positively charged ions, are formed in the gap between the central electrode and the side electrode. At the moment, the central end is a positive electrode, and the side electrode end is a negative electrode, so electrons bombard the central electrode by the side electrode, positive ions bombard the side electrode by the central electrode, and because the electron mass is very light and can be ignored, and the ion mass is relatively large, the side electrode is relatively seriously burnt when bombarding the side electrode.
According to the state of the ignition system of the original vehicle type, the differential design of the cylinders is carried out, and the detailed design scheme is as follows:
taking a 4-cylinder engine as an example, there are generally three ignition schemes for a conventional four-cylinder gasoline engine:
scheme one is that 2x2 type ignition coils (2 independent coils are arranged in the coil, each coil has 2 high voltage output ends, which can be understood as two 1x2 ignition coils are combined together), 1 set of high voltage lead (4) is added, and 4 spark plugs are added. The technology of the scheme is relatively lagged behind, the output capacity of the coil is low, and the technology is gradually eliminated.
Scheme II: 2 1-2 type ignition coils (only 1 coil inside the coil, 2 high-voltage output ends), 1 set of high-voltage wires (2), and 4 spark plugs. According to the scheme, each cylinder is ignited, 2 cylinders are used as positive electrodes for ignition, 2 cylinders are used as negative electrodes for ignition, the system voltage of the positive electrode ignition cylinder is high, a spark plug has the risk of being broken down, meanwhile, the system voltage is high, insulation of ignition parts is also a large challenge, and therefore the 1x2 type ignition coil gradually exits from a historical stage.
The third scheme is as follows: 4 ignition coils of 1x1 type, plus 4 spark plugs. According to the scheme, ignition of each cylinder is negative ignition, the system voltage is relatively low, and the risk of system failure is small. This scheme is currently the mainstream scheme.
Because the technology of the first scheme is relatively lagged behind, each cylinder in the third scheme is ignited by a negative electrode, the inventor focuses on the scheme of reforming the CNG ignition system from the second scheme.
CNG is reformed from a traditional gasoline engine with a scheme II (1-2 type ignition coil) because two cylinders are used for positive ignition and two cylinders are used for negative ignition in the scheme. For two cylinders with ignited positive electrodes, burning loss of side electrodes of the spark plug is serious, the burning loss of the center electrode is less influenced, after the side electrodes are burnt, a gap between the center electrode and the side electrodes is enlarged, the system voltage is also relatively increased, and when the system voltage exceeds the compression-resistant grade of the spark plug, the ceramic in the spark plug is broken down and fails. From the above analysis, it is known that if the risk of failure of the positive ignition cylinder is to be reduced, what needs to be improved is the burning loss condition of the side electrode of the spark plug, and the electrode is made of common nickel alloy (the cost is low), the burning loss resistance is poor, if the head of the side electrode is made of noble metal, the burning loss resistance is good, the increase of the gap between the central electrode and the side electrode is effectively inhibited, and the risk of failure of the ignition system is greatly reduced. For a negative ignition cylinder, the burning loss of a central electrode of a spark plug is serious, the burning loss of a side electrode is less influenced, after the central electrode is burnt, the gap between the central electrode and the side electrode is enlarged, the system voltage is also relatively enlarged, and when the system voltage exceeds the compression-resistant grade of the spark plug, the ceramic in the spark plug is broken down and fails. From the above analysis, it is found that if the risk of failure of the negative ignition cylinder is to be reduced, it is necessary to improve the burning loss of the center electrode of the spark plug, and the electrode is made of a common nickel alloy (low cost), and the burning loss resistance is poor.
For review: in the second scheme (1-2 type ignition coil), CNG is reformed from the traditional gasoline engine, only the head of the electrode at the side of the spark plug of the positive ignition cylinder is required to be changed into a noble metal material, and the central electrode is made of a nickel alloy material; the central electrode tip of the spark plug of the negative ignition cylinder is made of noble metal, and the side electrode is made of nickel alloy. By adopting the design of cylinder differentiation, the ignition voltage level of each cylinder can be better balanced, the combustion system is more stable, and the modification cost (ignition coil and spark plug) is greatly reduced. When the ignition device is installed, only the parts of the positive and negative ignition cylinders need to be marked correspondingly to prevent errors.
Only the side electrode is added with a needle-shaped noble metal material, the center electrode still adopts a common nickel alloy material, the market does not have the proposal, and the scheme is also the protection scope of the patent.
The invention has the following beneficial effects: according to the invention, through the differentiated design of the spark plugs of the cylinders, the head part of the side electrode of the spark plug of the positive ignition cylinder is made of a noble metal material, and the center electrode is made of a common nickel alloy material, so that the failure risk of the positive ignition cylinder can be reduced, and the modification cost (an ignition coil and the spark plug) is greatly reduced. At present, two main spark plug electrode materials are available in the market, wherein one spark plug electrode material is only a noble metal material at the head part of a center electrode and a side electrode type common nickel alloy material; the other is that the head parts of the central electrode and the side electrodes are made of noble metal, which is a good method, but the cost is relatively high. For the CNG project reformed from the traditional gasoline engine, on the premise of reducing the risk of system failure, the differential design of the spark plugs is adopted, so that the cost reduction is brought to a host factory, and meanwhile, the fault damage of engine parts and unpredictable dangers of the whole vehicle and drivers caused by the failure of an ignition system are effectively reduced.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (8)
1. A method for refitting a CNG ignition system is characterized in that: on the basis of the ignition system of the original gasoline engine vehicle, the cylinder-divided differential modification is adopted: under the condition that original motorcycle type ignition coil does not change, do every jar spark plug into the differentiation, increase the noble metal material on center electrode or side electrode according to ignition jar polarity: in the negative ignition cylinder, the center electrode of the spark plug is plated with a noble metal material; in the positive ignition cylinder, the side electrodes are plated with a noble metal material.
2. A method of retrofitting a CNG ignition system as claimed in claim 1, wherein: in the negative ignition cylinder, the material of the spark plug side electrode is not changed; in the positive ignition cylinder, the center electrode material is not changed.
3. A method of retrofitting a CNG ignition system as claimed in claim 1 or 2, wherein: in the negative ignition cylinder, the material of the side electrode of the spark plug is nickel alloy material; in the positive ignition cylinder, the central electrode material is made of nickel alloy material.
4. A method of retrofitting a CNG ignition system as claimed in claim 1 or 2, wherein: in the negative ignition cylinder, the central electrode tip part of the spark plug is coated with a noble metal material; in the positive ignition cylinder, the head of the spark plug-side electrode is plated with a noble metal material.
5. A method of retrofitting a CNG ignition system as claimed in claim 1, wherein: the ignition coil of the original vehicle ignition system is a 1x2 type ignition coil or a 2x2 type ignition coil.
6. A method of retrofitting a CNG ignition system as claimed in claim 1, wherein: the noble metal material used for plating on the central electrode or the side electrode is platinum or iridium.
7. A CNG ignition system, characterized by: the ignition system includes an ignition coil providing a source of high voltage, a high voltage wire for connecting the ignition coil and the spark plug together such that high voltage electricity is transmitted to the spark plug, a center electrode and side electrodes of the spark plug form an arc under high voltage breakdown to ignite fuel, and a noble metal material is added to the center electrode or the side electrodes depending on the polarity of the ignition cylinder in which the electrodes are used: in the negative ignition cylinder, the center electrode of the spark plug is plated with a noble metal material; in the positive ignition cylinder, the side electrodes are plated with a noble metal material.
8. A CNG ignition system according to claim 7, wherein: the ignition coil is a 1x2 type ignition coil or a 2x2 type ignition coil.
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| CN201811046886.8A CN109149377B (en) | 2018-09-08 | 2018-09-08 | Method for refitting CNG ignition system and CNG ignition system |
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| CN201811046886.8A CN109149377B (en) | 2018-09-08 | 2018-09-08 | Method for refitting CNG ignition system and CNG ignition system |
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| CN109149377B true CN109149377B (en) | 2020-03-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2888619B1 (en) * | 2005-07-13 | 2007-10-19 | Electricfil Automotive Soc Par | METHOD FOR DETECTING THE IGNITION PHASE OF A CYLINDER OF AN INTERNAL COMBUSTION ENGINE WITH VOLTAGE LIMITATION |
| US8671901B2 (en) * | 2009-11-30 | 2014-03-18 | GM Global Technology Operations LLC | Excess demand voltage relief spark plug for vehicle ignition system |
| CN202202955U (en) * | 2011-07-15 | 2012-04-25 | 江苏鸿派新能源发展有限公司 | Ignition system for gas generator set |
| CN106121892B (en) * | 2016-08-19 | 2017-12-29 | 西安东新石油设备厂有限公司 | A kind of diesel engine electric ignition system and method |
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