CN104500248A - Multiple-injection control method for fuel supply device of natural gas engine - Google Patents
Multiple-injection control method for fuel supply device of natural gas engine Download PDFInfo
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- CN104500248A CN104500248A CN201410791448.XA CN201410791448A CN104500248A CN 104500248 A CN104500248 A CN 104500248A CN 201410791448 A CN201410791448 A CN 201410791448A CN 104500248 A CN104500248 A CN 104500248A
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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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
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Abstract
The invention relates to a fuel gas injection method for natural gas engines, in particular to a multiple-injection control method for a fuel supply device of a natural gas engine. The method includes that the natural gas engine is a four-stroke engine, and each working cycle of the natural gas engine includes four stages; the fuel supply device of the natural gas engine is arranged on the lateral side of a gas inlet, and natural gas and air are mixed for combustion in a cylinder; multiple-injection control of the fuel supply device is realized by adjusting injection times and quantity of natural gas supplied by the fuel supply device in a crank angle range from 2400 before top dead center of compression stroke of an engine piston to 2400 after top dead center of compression stroke of the engine piston. Aiming at different engine load conditions, stability in ignition of engines is guaranteed by means of partial stratification, flame propagation velocity is increased, and firing stability is improved.
Description
Technical field
The present invention relates to a kind of injection method of combustion gas of natural gas engine, especially natural gas engine fuel supply device multi-injection controlling method.
Background technique
Along with the significantly raising of China's automobile pollution, occupy petroleum resources limited in a large number, also exacerbated air pollution degree, double challenge has been proposed to the petroleum resources of China and environment.Along with exhaling of energy-saving and emission-reduction is called together and advocated, need Devoting Major Efforts To Developing and use automobile that is energy-saving and clean fuel, reduce motor vehicle emission.
Rock gas by universally acknowledged be the most reality and the motor petrol of technical comparative maturity, the substitute fuel of diesel oil, its emission performance is good, produce Particulate Emission hardly, this fuel is compared with gasoline, diesel oil, significantly can reduce the discharge of carbon monoxide, sulfur dioxide, carbon dioxide, nitrogen oxide etc., and do not have benzene, lead etc. are carcinogenic to be detrimental to health with toxic substance, and natural gas vehicle engine obtains great attention.
Rock gas is at China's rich reserves, cheap, combustion cleaning, is a kind of novel energy being suitable as very much the alternative fuel of traditional combustion engine.Therefore, natural gas engine cleans as public awareness with its excellent Economy and discharge.Although natural gas engine uses economy, discharge is cleaned, the main component of rock gas is methane (CH
4), therefore its chemical property is more stable, performance in combustion, be exactly increase induction period, rock gas burning-point is 650 DEG C higher than gasoline (gasoline burning-point is 427 DEG C), and velocity of propagation of flame is slower than gasoline, easily cause rock gas to burn in working stroke insufficient, affect power character and the discharge of natural gas engine.
In order to fully improve the power performance of natural gas engine and improve discharge, people further investigate with regard to the combustion law of natural gas engine, excess air can improve fuel combustion adequacy, need to solve velocity of propagation of flame slow problem, the adequacy of guarantee combustion of natural gas and the kinetic stability of motor simultaneously.Although mostly heavy natural gas engine is to develop on the basis of diesel engine, but because general natural gas engine and diesel engine have essence different at the supplier of fuel and ignition mode, natural gas engine mostly is intake port injection spark ignition, and natural gas engine combustion stability can differ from and velocity of propagation of flame is slow, determine the CONCENTRATION DISTRIBUTION that must change rock gas in engine piston cylinder, thus improve the firing effect of natural gas engine in engine cylinder.
At present, traditional natural gas engine fuel supply mode is installed rock gas nozzle in intake valve side and carries out single injection event in intake valve, when adopting the injection method of single injection event to make to light a fire, in cylinder, mixed gas presents rare lower dense distribution, when ignition, the flame of combustion of natural gas can not stablize propagation, burn insufficient, affect the power performance of motor and clean discharge.
Summary of the invention
Technical problem to be solved by this invention is to provide natural gas engine fuel supply device multi-injection controlling method, and the method is on the basis of single injection event in conventional gas introduction door, under different operating load, before compression top center 240
0after crank angle to compression top center 240
0by regulating injecting times and the emitted dose of rock gas in crank angle range, the ignition mode of natural gas engine is become to be ignited by rich mixture the form of weak mixture, and then reach the object of the overall lean combustion of rock gas, the combustion stability improving motor and can clean discharge, what gas fuel was mixed is more even, plays the more high efficiency of natural gas engine.
In order to solve the problems of the technologies described above, technological scheme of the present invention is achieved in that
Natural gas engine fuel supply device multi-injection controlling method, natural gas engine is four-stroke engine, each work cycle of natural gas engine is divided into four-stage, comprise intake stroke, compression stroke, combustion stroke and exhaust stroke, this natural gas engine fuel supply device is arranged on intake valve side, the mixed combustion in cylinder of rock gas and air; Described fuel supplying device multi-injection controls to be before engine piston compresses stroke top dead center 240
0after crank angle to compression stroke top dead center 240
0in crank angle range, fuel metering supplier supplies injecting times and the emitted dose of rock gas, and specifically, the step of this fuel supplying device multi-injection controlling method is as follows:
1) when natural gas engine is in low-load work, carry out intake valve twice injection, the mixed gas that twice injection is formed in the cylinder becomes the distribution from thick to thin near to far away below spark plug, makes natural gas engine reach the object of overall lean combustion;
The time controling sprayed is before engine piston compresses stroke top dead center 240
0after crank angle to compression stroke top dead center 240
0in crank angle range.
2) in natural gas engine is in during load operation, carry out intake valve single injection event, the mixed gas that single injection event is formed in the cylinder presents the distribution from thick to thin near to far away below spark plug, makes natural gas engine reach the object of overall lean combustion;
The time controling sprayed is before engine piston compresses stroke top dead center 240
0after crank angle to compression stroke top dead center 240
0in crank angle range;
3) when high load works, carry out the injection of intake duct more than three times, the mixed gas that three injections are formed in the cylinder presents the distribution from thick to thin near to far away below spark plug, makes natural gas engine reach the object of overall lean combustion; The time controling sprayed is before engine piston compresses stroke top dead center 240
0after crank angle to compression stroke top dead center 240
0in crank angle range.
Further, the amount of the gas fuel that described intake duct sprays at every turn is certain, and its numerical value determines with the rock gas total amount needing to spray in each work cycle and injecting times; The emitted dose of rock gas is meet the chemically correct fuel that rock gas catches fire to calculate, by high-energy sparking plug ignition; Due to the velocity of propagation of flame of combustion of natural gas, comparatively liquid fuel is slow, make delay period and combustion duration long, be easy to, because of incomplete combustion, cause emission problem; HC and CO particularly can be caused when low-load to discharge increase, make NOx emission too high when high load.
beneficial effect of the present invention and technical characterstic are:
the present invention is utilized to control natural gas engine fuel supply device multi-injection, fuel gas injection amount and combustion gas injection moment all have the burning of engine gas and emission performance comparatively significantly to be affected, and this mainly determines the mixture strength field pattern in time of ignition cylinder due to fuel gas injection amount and combustion gas injection moment; For different motors by load condition, in the mode of local delamination, based on the homogeneous charge namely on a large scale, both stable ignition can be ensured to the local enriching that mixed gas around spark plug is implemented among a small circle, can velocity of propagation of flame be improved again, improve the stability of catching fire.
Accompanying drawing explanation
Fig. 1 is the view of the natural gas engine fuel supply device first time injection rock gas that the present invention proposes.
Fig. 2 is the view of the natural gas engine fuel supply device second time injection rock gas that the present invention proposes.
Fig. 3 is the view of the natural gas engine fuel supply device third time injection rock gas that the present invention proposes.
Fig. 4 is the mixed gas mixing situation schematic diagram that the natural gas engine fuel supply device that proposes of the present invention sprays after rock gas in cylinder.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, Figure 2, shown in Fig. 3 and Fig. 4, natural gas engine fuel supply device multi-injection controlling method, natural gas engine is four-stroke engine, each work cycle of natural gas engine is divided into four-stage, comprise intake stroke, compression stroke, combustion stroke and exhaust stroke, this natural gas engine fuel supply device is arranged on intake valve side, the mixed combustion in cylinder of rock gas and air; Described fuel supplying device multi-injection controls to be before engine piston compresses stroke top dead center 240
0after crank angle to compression stroke top dead center 240
0in crank angle range, fuel metering supplier supplies injecting times and the emitted dose of rock gas, and specifically, the step of this fuel supplying device multi-injection controlling method is as follows:
1) when natural gas engine is in low-load work, intake valve twice injection is carried out, i.e. crank angle to 120 in the intake stroke process of motor
0time start until in the exhaust stroke process of motor crank angle to 60
0time till in scope, nozzle one is divided into twice and sprays in cylinder by rock gas, thin inflammable mixture is formed like this in the region away from spark plug, layering effect is formed with the nearly spark plug one end in cylinder, when plug ignition, first dense around spark plug mixed gas region forms stronger flame, and then bamboo telegraph is to thin mixed gas region, realizes smooth combustion; The mixed gas that twice injection is formed in the cylinder becomes the distribution from thick to thin near to far away below spark plug, makes natural gas engine reach the object of overall lean combustion;
The time controling sprayed is before engine piston compresses stroke top dead center 240
0after crank angle to compression stroke top dead center 240
0in crank angle range.
2) in natural gas engine is in during load operation, carry out intake valve single injection event, the mixed gas that single injection event is formed in the cylinder forms Homogeneous phase mixing below spark plug, realizes homogeneous combustion, makes natural gas engine reach the object of overall lean combustion;
The time controling sprayed is before engine piston compresses stroke top dead center 240
0after crank angle to compression stroke top dead center 240
0in crank angle range;
3) when high load works, the injection of intake duct more than three times is carried out, i.e. crank angle to 120 in the intake stroke process of motor
0time start until in the exhaust stroke process of motor crank angle to 60
0time till in scope, nozzle one is divided into three times and sprays in cylinder by rock gas, thin inflammable mixture is formed like this in the region away from spark plug, layering effect is formed with the nearly spark plug one end in cylinder, when plug ignition, first dense around spark plug mixed gas region forms stronger flame, and then bamboo telegraph is to thin mixed gas region, realizes smooth combustion; The mixed gas that three injections are formed in the cylinder presents the distribution from thick to thin near to far away below spark plug, makes natural gas engine reach the object of overall lean combustion; The time controling sprayed is before engine piston compresses stroke top dead center 240
0after crank angle to compression stroke top dead center 240
0in crank angle range.
On the basis of technological scheme described in the above embodiments, preferably, the amount of the gas fuel that described intake duct sprays at every turn is certain, and its numerical value determines with the rock gas total amount needing to spray in each work cycle and injecting times; The emitted dose of rock gas is meet the chemically correct fuel that rock gas catches fire to calculate, by high-energy sparking plug ignition; Due to the velocity of propagation of flame of combustion of natural gas, comparatively liquid fuel is slow, make delay period and combustion duration long, be easy to, because of incomplete combustion, cause emission problem; HC and CO particularly can be caused when low-load to discharge increase, make NOx emission too high when high load.
Claims (2)
1. a natural gas engine fuel supply device multi-injection controlling method, natural gas engine is four-stroke engine, each work cycle of natural gas engine is divided into four-stage, comprise intake stroke, compression stroke, combustion stroke and exhaust stroke, this natural gas engine fuel supply device is arranged on intake valve side, the mixed combustion in cylinder of rock gas and air; It is characterized in that: described fuel supplying device multi-injection controls to be before engine piston compresses stroke top dead center 240
0after crank angle to compression stroke top dead center 240
0in crank angle range, fuel metering supplier supplies injecting times and the emitted dose of rock gas, and specifically, the step of this fuel supplying device multi-injection controlling method is as follows:
1) when natural gas engine is in low-load work, carry out intake valve twice injection, the mixed gas that twice injection is formed in the cylinder becomes the distribution from thick to thin near to far away below spark plug, makes natural gas engine reach the object of overall lean combustion;
The time controling sprayed is before engine piston compresses stroke top dead center 240
0after crank angle to compression stroke top dead center 240
0in crank angle range;
2) in natural gas engine is in during load operation, carry out intake valve single injection event, the mixed gas that single injection event is formed in the cylinder presents the distribution from thick to thin near to far away below spark plug, makes natural gas engine reach the object of overall lean combustion;
The time controling sprayed is before engine piston compresses stroke top dead center 240
0after crank angle to compression stroke top dead center 240
0in crank angle range;
3) when high load works, carry out the injection of intake duct more than three times, the mixed gas that three injections are formed in the cylinder presents the distribution from thick to thin near to far away below spark plug, makes natural gas engine reach the object of overall lean combustion; The time controling sprayed is before engine piston compresses stroke top dead center 240
0after crank angle to compression stroke top dead center 240
0in crank angle range.
2. natural gas engine fuel supply device multi-injection controlling method according to claim 1, it is characterized in that: the amount of the gas fuel that described intake duct sprays at every turn is certain, its numerical value determines with the rock gas total amount needing to spray in each work cycle and injecting times; The emitted dose of rock gas is meet the chemically correct fuel that rock gas catches fire to calculate, by high-energy sparking plug ignition; Due to the velocity of propagation of flame of combustion of natural gas, comparatively liquid fuel is slow, make delay period and combustion duration long, be easy to, because of incomplete combustion, cause emission problem; HC and CO particularly can be caused when low-load to discharge increase, make NOx emission too high when high load.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410791448.XA CN104500248A (en) | 2014-12-19 | 2014-12-19 | Multiple-injection control method for fuel supply device of natural gas engine |
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|---|---|---|---|
| CN201410791448.XA CN104500248A (en) | 2014-12-19 | 2014-12-19 | Multiple-injection control method for fuel supply device of natural gas engine |
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| CN104500248A true CN104500248A (en) | 2015-04-08 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109268164A (en) * | 2018-07-24 | 2019-01-25 | 哈尔滨工程大学 | A kind of natural gas engine burning tissues method and device |
| CN109386396A (en) * | 2018-09-29 | 2019-02-26 | 哈尔滨工程大学 | It is a kind of with high-low pressure gas injection and it is micro- spray diesel oil natural gas engine method for controlling combustion |
| CN110284991A (en) * | 2019-06-26 | 2019-09-27 | 哈尔滨工程大学 | A kind of natural gas engine structure and its burning tissues method |
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| CN1512049A (en) * | 2002-11-28 | 2004-07-14 | 株式会社丰田自动织机 | IC engine and its controller |
| JP2006104940A (en) * | 2004-09-30 | 2006-04-20 | Mazda Motor Corp | Engine control device |
| US20080257304A1 (en) * | 2007-04-20 | 2008-10-23 | Nissan Motor Co., Ltd. | Internal combustion engine and combustion method of the same |
| CN103256135A (en) * | 2012-02-21 | 2013-08-21 | 福特环球技术公司 | System and method for compensating cetan |
| JP2014092129A (en) * | 2012-11-06 | 2014-05-19 | Denso Corp | Fuel supply device |
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2014
- 2014-12-19 CN CN201410791448.XA patent/CN104500248A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1512049A (en) * | 2002-11-28 | 2004-07-14 | 株式会社丰田自动织机 | IC engine and its controller |
| JP2006104940A (en) * | 2004-09-30 | 2006-04-20 | Mazda Motor Corp | Engine control device |
| US20080257304A1 (en) * | 2007-04-20 | 2008-10-23 | Nissan Motor Co., Ltd. | Internal combustion engine and combustion method of the same |
| CN103256135A (en) * | 2012-02-21 | 2013-08-21 | 福特环球技术公司 | System and method for compensating cetan |
| JP2014092129A (en) * | 2012-11-06 | 2014-05-19 | Denso Corp | Fuel supply device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109268164A (en) * | 2018-07-24 | 2019-01-25 | 哈尔滨工程大学 | A kind of natural gas engine burning tissues method and device |
| CN109386396A (en) * | 2018-09-29 | 2019-02-26 | 哈尔滨工程大学 | It is a kind of with high-low pressure gas injection and it is micro- spray diesel oil natural gas engine method for controlling combustion |
| CN109386396B (en) * | 2018-09-29 | 2021-09-10 | 哈尔滨工程大学 | Combustion control method for natural gas engine |
| CN110284991A (en) * | 2019-06-26 | 2019-09-27 | 哈尔滨工程大学 | A kind of natural gas engine structure and its burning tissues method |
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Application publication date: 20150408 |