CN204677293U - A kind of direct-injection LNG-diesel dual-fuel system - Google Patents
A kind of direct-injection LNG-diesel dual-fuel system Download PDFInfo
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- CN204677293U CN204677293U CN201520405134.1U CN201520405134U CN204677293U CN 204677293 U CN204677293 U CN 204677293U CN 201520405134 U CN201520405134 U CN 201520405134U CN 204677293 U CN204677293 U CN 204677293U
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- oil
- diesel oil
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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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Abstract
The utility model relates to a kind of direct-injection LNG-diesel dual-fuel system, by LNG air supply system, diesel oil oil supply system, electronic control system and dual fuel injection system four part composition, wherein, LNG air supply system comprises LNG air cylinder group case, LNG vaporizer, low-voltage solenoid valve and LNG pressure reducing regulator, diesel oil oil supply system comprises oil storage tank, metering valve, oil feed pump and safety check, electronic control system comprises electronic controller, speed probe and exhaust gas temperature sensor, LNG air supply system is connected on electronic controller by low-voltage solenoid valve, diesel oil oil supply system is connected on electronic controller by metering valve, dual fuel injection system adopts toroidal swirl type fuel injector.The utility model structure is simple, reasonable in design, the alternative fuel of rock gas as diesel oil just can be introduced when not needing change diesel engine essential structure, reduce the reforming cost of diesel engine, and avoid the restriction of natural gas fired mode and combustion manner, wide accommodation.
Description
Technical field
The utility model relates to a kind of direct-injection LNG-diesel dual-fuel system, belongs to diesel oil-natural gas double fuel engine field.
Background technique
Rock gas is as typical gaseous fuel, and its abundance, cost are low, discharge quantity of particulate matter is little, is the ideal substitute of conventional diesel fuel.But, the combustion ratio of rock gas is greater than diesel oil, can not automatically as diesel oil light, and usually needs to be mixed with the air of suction by rock gas in advance, then use the air-natural gas mixture in spark ignitor firing chamber, thus cause diesel engine not to be used for rock gas.And this firing mode make the compression ratio of rock gas and import volume little, output power and the combustion efficiency of motor are low, and rock gas is only flammable within the scope of narrower air-fuel proportions of ingredients, and accommodation is narrow.
Traditional diesel engine adopts ignition by compression mode, the compression ratio of compression ignition engine is more much higher than spark ignition engine, the feature of high compression ratio and un-throttled gas handling system make that fuel economy is higher, performance better and in energy fuel consumption lower.But replace diesel fuel with rock gas, first need to improve diesel engine, increase auxiliary ignition system or adopt more complicated electronic control system, reforming cost is too high.
Summary of the invention
The purpose of this utility model overcomes deficiency of the prior art, a kind of universal Diesel Fuel-Natural Gas Dual fuel Electricity Spurt System is provided, the alternative fuel of rock gas as diesel oil just can be introduced when not needing change diesel engine essential structure, greatly reduce the reforming cost of diesel engine, and avoid the restriction of natural gas fired mode and combustion manner, accommodation is wider.
For achieving the above object, the technological scheme taked of the utility model is as follows:
A kind of direct-injection LNG-diesel dual-fuel system, by LNG air supply system, diesel oil oil supply system, electronic control system and dual fuel injection system four part composition, LNG air supply system comprises the LNG air cylinder group case 11 be connected successively by flexible pipe, LNG vaporizer 12, low-voltage solenoid valve 13 and LNG pressure reducing regulator 14, diesel oil oil supply system comprises the oil storage tank 21 connected successively, metering valve 22, oil feed pump 23 and safety check 24, electronic control system comprises electronic controller 31, speed probe 32 and exhaust gas temperature sensor 33, LNG air supply system is connected on electronic controller 31 by low-voltage solenoid valve 13, diesel oil oil supply system is connected on electronic controller 31 by metering valve 22, dual fuel injection system comprises cylinder head 41, cylinder wall 42, piston 43 and fuel injector 44, cylinder head 41 covers the top of cylinder wall 42, firing chamber 45 is by cylinder head 41, cylinder wall 42 and piston 43 limit, fuel injector 44 is installed in cylinder head 41, fuel injector 44 comprises fuel channel 46 and fuel nozzle 47, the tip of fuel nozzle 47 is arranged in firing chamber 45, LNG and diesel oil are directly injected in firing chamber 45 by fuel nozzle 47, the gas-entered passageway 48 and exhaust passage 49 that communicate with firing chamber 45 is offered in cylinder head 41, controlled by suction valve 51 and outlet valve 52 respectively.
Preferably, described fuel channel 46 comprises separate LNG passage and diesel oil passage, and described fuel nozzle 47 comprises separate LNG nozzle and diesel fuel nozzle, and LNG passage is connected with LNG nozzle, and diesel oil passage is connected with diesel fuel nozzle.
Preferably, in described firing chamber 45, spray LNG and diesel oil for carry out simultaneously, or first spray diesel oil, and then spray LNG.
Preferably, duel fuel engine start up period and the idling stage, fuel injector 44 only sprays diesel oil in firing chamber 45, and when duel fuel engine runs well, fuel injector 44 only sprays diesel oil in firing chamber 45, or sprays LNG-diesel oil mixed gas.
Direct-injection LNG-diesel dual-fuel System Working Principle of the present utility model is: the LNG in air cylinder enters air/fuel mixer after decompression, mix with fresh air, mixed gas enters in engine cylinder through intake manifold, when piston stroking upward is by near for mixed pressure reducer coupling top dead center, the high temperature that compression produces makes the mixed gas in the appropriate diesel oil ignited cylinder sprayed into, and mixed fire with it, promote piston movement and do work.When motor loads, electronic control system receives the load signal of motor, namely according to the signal such as engine throttle position, load, rotating speed and delivery temperature of sensor input, fuzzy preferred and simulation analysis contrast is carried out through electronic control software, and export control command parameter, increase the delivery volume of rock gas and the fuel injection quantity of diesel pilot by actuator.Can be changed between full diesel oil working method and double fuel working method easily by electronic control system.
The beneficial effects of the utility model are:
(1) the thermomechanics working principle that circulates based on the Di Saier of former diesel engine of the utility model, the ignition by compression mode and the high compression ratio that retain former diesel engine are constant, engine body and component are substantially constant, become the mixed gas of rock gas and air in the cylinder from simple air in former diesel engine by the medium that compresses, during engine operation, pure diesel combustion originally becomes the mixing combustion of diesel oil and rock gas, fuel energy density is large, be conducive to the power and the moment of torsion that improve motor, increase the distance travelled of automobile.And the average substitution rate of rock gas to diesel oil reaches more than 70%, decreases the pollution to environment.
(2) the utility model adopts direct spray type electronic control system, its mixing principle had both been different from venturi type mixer, be different from again high-voltage electromagnetic injection valve, it does not have harsh requirement to the suction pressure of rock gas, wider gas pressure scope can be adapted to, and structure is simple, avoids the use of the expensive components and parts such as absolute pressure sensor, gas flowmeter, high-voltage electromagnetic injection valve, reduces the reforming cost of diesel engine.
(3) the utility model detects the signal parameters such as engine load, rotating speed, delivery temperature, throttle position in real time by electronic control unit, and send instruction exactly in good time, make the instantaneous operating conditions of tracking that engine aspirating system energy is random, and enter sufficient amount of natural gas and air quantity on demand, and make fully to mix under optimum proportioning, to ensure that the burning in engine cylinder of rock gas and diesel dual-fuel reaches the optimum state.
Accompanying drawing illustrates:
Fig. 1: direct-injection LNG-diesel dual-fuel system schematic of the present utility model.
embodiment:
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
Embodiment 1
As shown in Figure 1, a kind of direct-injection LNG-diesel dual-fuel system, by LNG air supply system, diesel oil oil supply system, electronic control system and dual fuel injection system four part composition, LNG air supply system comprises the LNG air cylinder group case 11 be connected successively by flexible pipe, LNG vaporizer 12, low-voltage solenoid valve 13 and LNG pressure reducing regulator 14, diesel oil oil supply system comprises the oil storage tank 21 connected successively, metering valve 22, oil feed pump 23 and safety check 24, electronic control system comprises electronic controller 31, speed probe 32 and exhaust gas temperature sensor 33, LNG air supply system is connected on electronic controller 31 by low-voltage solenoid valve 13, diesel oil oil supply system is connected on electronic controller 31 by metering valve 22, dual fuel injection system comprises cylinder head 41, cylinder wall 42, piston 43 and fuel injector 44, cylinder head 41 covers the top of cylinder wall 42, firing chamber 45 is by cylinder head 41, cylinder wall 42 and piston 43 limit, fuel injector 44 is installed in cylinder head 41, fuel injector 44 comprises fuel channel 46 and fuel nozzle 47, the tip of fuel nozzle 47 is arranged in firing chamber 45, LNG and diesel oil are directly injected in firing chamber 45 by fuel nozzle 47, the gas-entered passageway 48 and exhaust passage 49 that communicate with firing chamber 45 is offered in cylinder head 41, controlled by suction valve 51 and outlet valve 52 respectively.Described fuel channel 46 comprises separate LNG passage and diesel oil passage, and described fuel nozzle 47 comprises separate LNG nozzle and diesel fuel nozzle, and LNG passage is connected with LNG nozzle, and diesel oil passage is connected with diesel fuel nozzle.In described firing chamber 45, spray LNG and diesel oil for carry out simultaneously, or first spray diesel oil, and then spray LNG.Duel fuel engine start up period and the idling stage, fuel injector 44 only sprays diesel oil in firing chamber 45, and when duel fuel engine runs well, fuel injector 44 only sprays diesel oil in firing chamber 45, or sprays LNG-diesel oil mixed gas.
Below only the utility model and mode of execution thereof are described; this description is not restricted; shown in accompanying drawing is also one of mode of execution of the present utility model; actual structure is not limited thereto; if those skilled in the art enlighten by it; when not departing from the utility model and creating aim, design the structure similar to this technological scheme and mode of execution thereof without creationary, all should work as and belong to protection domain of the present utility model.
Claims (4)
1. a direct-injection LNG-diesel dual-fuel system, it is characterized in that, by LNG air supply system, diesel oil oil supply system, electronic control system and dual fuel injection system four part composition, LNG air supply system comprises LNG air cylinder group case (11) be connected successively by flexible pipe, LNG vaporizer (12), low-voltage solenoid valve (13) and LNG pressure reducing regulator (14), diesel oil oil supply system comprises the oil storage tank (21) connected successively, metering valve (22), oil feed pump (23) and safety check (24), electronic control system comprises electronic controller (31), speed probe (32) and exhaust gas temperature sensor (33), LNG air supply system is connected on electronic controller (31) by low-voltage solenoid valve (13), diesel oil oil supply system is connected on electronic controller (31) by metering valve (22), dual fuel injection system comprises cylinder head (41), cylinder wall (42), piston (43) and fuel injector (44), cylinder head (41) covers the top of cylinder wall (42), firing chamber (45) is by cylinder head (41), cylinder wall (42) and piston (43) limit, fuel injector (44) is installed in cylinder head (41), fuel injector (44) comprises fuel channel (46) and fuel nozzle (47), the tip of fuel nozzle (47) is arranged in firing chamber (45), LNG and diesel oil are directly injected in firing chamber (45) by fuel nozzle (47), the gas-entered passageway (48) and exhaust passage (49) that communicate with firing chamber (45) is offered in cylinder head (41), controlled by suction valve (51) and outlet valve (52) respectively.
2. direct-injection LNG-diesel dual-fuel system as claimed in claim 1, it is characterized in that, described fuel channel (46) comprises separate LNG passage and diesel oil passage, described fuel nozzle (47) comprises separate LNG nozzle and diesel fuel nozzle, LNG passage is connected with LNG nozzle, and diesel oil passage is connected with diesel fuel nozzle.
3. direct-injection LNG-diesel dual-fuel system as claimed in claim 1, is characterized in that, in described firing chamber (45), injection LNG and diesel oil are for carry out simultaneously, or first spray diesel oil, and then spray LNG.
4. direct-injection LNG-diesel dual-fuel system as claimed in claim 1, it is characterized in that, duel fuel engine start up period and the idling stage, fuel injector (44) only sprays diesel oil in firing chamber (45), when duel fuel engine runs well, fuel injector (44) only sprays diesel oil in firing chamber (45), or sprays LNG-diesel oil mixed gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520405134.1U CN204677293U (en) | 2015-06-12 | 2015-06-12 | A kind of direct-injection LNG-diesel dual-fuel system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520405134.1U CN204677293U (en) | 2015-06-12 | 2015-06-12 | A kind of direct-injection LNG-diesel dual-fuel system |
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| CN204677293U true CN204677293U (en) | 2015-09-30 |
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| CN201520405134.1U Expired - Fee Related CN204677293U (en) | 2015-06-12 | 2015-06-12 | A kind of direct-injection LNG-diesel dual-fuel system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106014727A (en) * | 2016-06-27 | 2016-10-12 | 北京工业大学 | Single-nozzle internal combustion engine gas-liquid two-phase fuel injection system and method |
| CN106762271A (en) * | 2016-12-27 | 2017-05-31 | 清华大学 | For the electronic control low-pressure fuel gauge of internal combustion engine |
| CN109723547A (en) * | 2019-01-30 | 2019-05-07 | 一汽解放汽车有限公司 | Flexible fuel engine and control method |
| CN110080915A (en) * | 2019-05-31 | 2019-08-02 | 西安交通大学 | A kind of gas/liquid double fuel low pressure direct injection system |
-
2015
- 2015-06-12 CN CN201520405134.1U patent/CN204677293U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106014727A (en) * | 2016-06-27 | 2016-10-12 | 北京工业大学 | Single-nozzle internal combustion engine gas-liquid two-phase fuel injection system and method |
| CN106762271A (en) * | 2016-12-27 | 2017-05-31 | 清华大学 | For the electronic control low-pressure fuel gauge of internal combustion engine |
| CN106762271B (en) * | 2016-12-27 | 2018-05-29 | 清华大学 | For the electronic control low-pressure fuel gauge of internal combustion engine |
| CN109723547A (en) * | 2019-01-30 | 2019-05-07 | 一汽解放汽车有限公司 | Flexible fuel engine and control method |
| CN109723547B (en) * | 2019-01-30 | 2023-08-15 | 一汽解放汽车有限公司 | Flexible fuel engine and control method |
| CN110080915A (en) * | 2019-05-31 | 2019-08-02 | 西安交通大学 | A kind of gas/liquid double fuel low pressure direct injection system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150930 Termination date: 20160612 |