CN102493902A - Rail pressure fluctuation control device for hydrogen internal combustion engine - Google Patents
Rail pressure fluctuation control device for hydrogen internal combustion engine Download PDFInfo
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- CN102493902A CN102493902A CN2011104039276A CN201110403927A CN102493902A CN 102493902 A CN102493902 A CN 102493902A CN 2011104039276 A CN2011104039276 A CN 2011104039276A CN 201110403927 A CN201110403927 A CN 201110403927A CN 102493902 A CN102493902 A CN 102493902A
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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 invention relates to a rail pressure fluctuation control device for a hydrogen internal combustion engine. The control device has a multi-cavity series structure; volumetric cavities (11, 12, 13 and 14) which are arranged on a pipeline and have large diameters are used for preparing sufficient hydrogen for corresponding hydrogen nozzles (21, 22, 23 and 24), so that a phenomenon that the pressure fluctuation in a rail is large, which is caused by hydrogen jetting, is improved; particularly, the volume of the hydrogen-rail volumetric cavity (14) connected with the fourth cylindrical hydrogen nozzle is required to be larger than those of the other respective cavities (11, 12 and 13); furthermore, a pressure wave is reflected and interfered during transmission among the volumetric cavities by a choppy section (10) of the hydrogen rail, so that the non-uniformity of hydrogen supply of each cylinder is reduced. According to the rail pressure fluctuation control device, the hydrogen supply pressure under various working conditions is stable; the hydrogen can be uniformly distributed to each cylinder; and the hydrogen internal combustion engine can be operated stably under a full working condition.
Description
Technical field
The present invention relates to the port injection type hydrogen internal combustion engine, relate in particular to a kind of rail pressure fluctuation control gear that is used for hydrogen internal combustion engine.
Background technique
Along with the continuous development of industry, traffic, environmental pollution and energy crisis have become the two large problems that the whole world is faced, and the development of actively promoting renewable and clean energy resource has become the common recognition of various countries.The substitute fuel of oil such as methyl alcohol, biogas, rock gas, plant wet goods can replace petroleum fuel in varying degrees, but all can produce CO, CO after the burning
2Deng, cause the pollution of environment.By contrast, have only hydrogen to have cleaning, efficiently reach outstanding advantages such as products of combustion cleaning, be regarded as the most potential energy.
Also there is certain problem in hydrogen as vehicle fuel, and it is lower mainly to show as energy density; Want the cube emitted dose bigger; Especially when the high rotating speed of internal-combustion engine, large load operation, need spray the hydrogen of a large amount of volumes at short notice, thereby be difficult to avoid causing pressure surge bigger in the hydrogen-feeding system; Mixture strength control inaccuracy, and then cause the engine cycle change to worsen more.
For avoiding the problems referred to above, generally install the voltage stabilizing track additional and come stable ejection pressure at spray nozzle front end, can alleviate the pressure surge in the hydrogen-feeding system so to a certain extent; But the pressure surge that can't avoid producing because of a certain cylinder hydrogen injection is to the influence of adjacent cylinder spray hydrogen, and especially under rated engine speed, the hydrogen injection frequency is higher; Spray hydrogen amount is bigger; Interactional degree strengthens between each cylinder, can influence the hydrogen recycle emitted dose of each cylinder when serious, and then causes the engine cycle fluctuation bigger; In addition for four-cylinder internal combustion engine, caused in the hydrogen supply process fluctuation of the 4th cylinder corresponding nozzle forefront pressure bigger, as shown in Figure 2 in proper order by the spray hydrogen of firing order decision, caused the cyclical variations of internal-combustion engine to increase equally.
For addressing the above problem; The invention discloses a kind of rail pressure fluctuation control gear that is used for hydrogen internal combustion engine, can either be implemented in steady hydrogen supply pressure under the various operating modes, each cylinder hydrogen supply is even by making; Optimize to the corresponding hydrogen rail cavity volume volume of the 4th cylinder simultaneously; Reduce the engine cycle change to greatest extent, realized the steady running of hydrogen internal combustion engine under full operating mode, had great use value.
Summary of the invention
The objective of the invention is to propose a kind of rail pressure fluctuation control gear that is used for hydrogen internal combustion engine; Can satisfy the variable cross section voltage stabilizing track of its user demand to various forms of hydrogen internal combustion engine designs; Be implemented in steady hydrogen supply pressure under the various operating modes; Hydrogen is distributed accurately evenly, guarantee the steady running of hydrogen internal combustion engine under full operating mode.
In order to realize the object of the invention; The present invention proposes a kind of rail pressure fluctuation control gear that is used for the multi-cylinder hydrogen internal combustion engine; Comprise: be arranged on a plurality of hydrogen rail cavity volumes on the hydrogen supply pipeline; Be communicated with through being communicated with the track series connection between a plurality of hydrogen rail cavity volumes; The hydrogen nozzle of each in a plurality of hydrogen rail cavity volumes and a corresponding cylinder is communicated with, and the cross sectional area of hydrogen rail cavity volume is greater than the cross sectional area that is communicated with track, thereby utilizes the hydrogen rail cavity volume that diameter is bigger on the pipeline to prepare sufficient hydrogen for the hydrogen nozzle of corresponding cylinder.
Preferably, the volume of a plurality of hydrogen rail cavity volumes differs from one another, wherein should be greater than the corresponding cavity volume volume of other each cylinder nozzle corresponding to the hydrogen rail cavity volume volume of the maximum cylinder of spray nozzle front end pressure surge in the hydrogen supply process.Particularly corresponding to four-cylinder internal combustion engine, the hydrogen rail cavity volume volume that connects the 4th cylinder hydrogen nozzle should be greater than the hydrogen rail cavity volume of other cylinder.
Preferably; Each hydrogen rail cavity volume be communicated with track has sudden change in the joint cross sectional area; Reflection and interference take place through the connection track of sudden change cross sectional area between each hydrogen rail cavity volume in the pressure wave that produces in the hydrogen injection process in transmittance process, thereby have reduced the nonuniformity of each cylinder hydrogen injection.
Preferably; For satisfying hydrogen internal combustion engine maximum hydrogen traffic demand Mmax; The minimum value Smin of cross sectional area that connects the connection track of each hydrogen rail cavity volume is designed to: Smin=Mmax/Vmax; Wherein Vmax is a hydrogen at the ducted Peak Flow Rate that is communicated with cavity volume, and the maximum value (Smax) that connects the connecting pipe sectional area of cavity volume receives the restriction of rail internal pressure fluctuation, and the ratio of cross sectional area and the cross sectional area of the hydrogen rail cavity volume of one of them cylinder that connects the connection track of each hydrogen rail cavity volume is 0.01～0.4; Thereby can be implemented in steady hydrogen supply pressure under the various operating modes, guarantee the steady running of hydrogen internal combustion engine under full operating mode.
Description of drawings
Fig. 1 has shown that the present invention is used for the rail pressure fluctuation control gear schematic representation of hydrogen internal combustion engine.
Fig. 2 has shown each manifold pressure fluctuation situation in traditional uniform section hydrogen rail.
The fluctuate contrast of situation and traditional voltage stabilizing rail of the rail pressure in the corresponding chamber of rail pressure fluctuation control gear the 4th cylinder that is used for hydrogen internal combustion engine that adopts the present invention to propose of having shown Fig. 3.
Fig. 4 has shown interior each cavity pressure fluctuation situation of the rail pressure fluctuation control gear that is used for hydrogen internal combustion engine that adopts the present invention to propose.
Embodiment
Accompanying drawing 1 has shown the rail pressure fluctuation control gear that is used for one four cylinder hydrogen internal combustion engine of one embodiment of the present of invention, and this device comprises a plurality of hydrogen rail cavity volumes 11,12 that are arranged on the hydrogen supply pipeline; 13 and 14; Be communicated with through being communicated with track 10 series connection between a plurality of hydrogen rail cavity volumes 11,12,13 and 14.In the hydrogen rail cavity volume 11,12,13 and 14 each is communicated with the hydrogen nozzle 21,22,23 and 24 of a corresponding cylinder.The cross sectional area of hydrogen rail cavity volume is greater than the cross sectional area that is communicated with track, hydrogen rail cavity volume be communicated with track has sudden change in the joint cross section.A plurality of hydrogen rail cavity volumes 11,12,13 can be different with 14 volume.The volume of the hydrogen rail cavity volume 14 that is communicated with the hydrogen nozzle of the 4th cylinder in the present embodiment, is maximum.
For satisfying hydrogen internal combustion engine maximum hydrogen traffic demand (M
Max), the minimum value S of the plane of structure area of the connection track of connection hydrogen rail cavity volume
MinBe designed to: S
Min=M
Max/ V
Max, V wherein
MaxBe the Peak Flow Rate of hydrogen in the connection track that is communicated with cavity volume, realize that effectively the hydrogen supply is in time sufficient, stablized the pressure of spray nozzle front end, reduced the nonuniformity of hydrogen internal combustion engine hydrogen supply system; Maximum value (the S that connects the connection track sectional area of cavity volume
Max) receiving the restriction of rail internal pressure fluctuation, the ratio of cross sectional area and the cross sectional area of the hydrogen rail cavity volume 11 of the corresponding first cylinder nozzle that connects the connection track of hydrogen rail cavity volume is 0.01～0.4.
This device can realize that hydrogen internal combustion engine fluctuates in allowed band in maximum speed busy hour hydrogen rail internal pressure, makes each cylinder hydrogen supply even, realizes the steady running of hydrogen internal combustion engine.
The working principle of this device is: hydrogen is connected with each cylinder hydrogen nozzle through the voltage stabilizing track through the hydrogen supply pipeline; In the hydrogen injection process; The hydrogen rail cavity volume corresponding with each nozzle cylinder can provide required amounts of hydrogen; Especially be operated in maximum speed at hydrogen internal combustion engine, the busy hour cavity volume still can satisfy its hydrogen demand, and the pressure wave that is brought by hydrogen injection simultaneously reflection can take place when passing through the connecting pipe between adjacent cavity volume or interferes; Thereby weakened in each nozzle operation process the influence of hydrogen supply system, realized that hydrogen internal combustion engine hydrogen supply under different operating modes is sufficient and each cylinder distributed uniform is reasonable.
The invention has the advantages that: this control gear is the multi-cavity cascaded structure; Be connected through connecting pipe between each chamber; The connecting pipe sectional area of connection cavity volume is 0.25 with the ratio of the cavity volume sectional area of the corresponding first cylinder nozzle; Effectively improve the hydrogen rail internal pressure fluctuation that causes by hydrogen injection, thereby reduced the nonuniformity of each cylinder hydrogen supply.Each manifold pressure of tradition uniform section hydrogen rail time dependent situation that fluctuates is as shown in Figure 2; It is thus clear that the hydrogen rail pipeline pressure fluctuation that the 4th cylinder is corresponding is bigger; Fig. 3 has shown the situation contrast of the pressure surge in the corresponding cavity volume of hydrogen internal combustion engine the 4th cylinder; The rail pressure fluctuation control gear and the traditional voltage stabilizing rail device that have adopted the present invention to propose respectively; The rail pressure fluctuation control gear that adopts the present invention to propose can effectively reduce the pressure surge in the corresponding cavity volume, and Fig. 4 has shown the pressure surge situation of each cavity volume, employing be the rail pressure fluctuation control gear that is used for hydrogen internal combustion engine that the present invention proposes; The curve of cyclical fluctuations shows that each cavity pressure fluctuation ratio is consistent, thereby has improved the hydrogen-feeding system working stability; Guarantee that hydrogen-feeding system can be to the even supply of hydrogen of hydrogen internal combustion engine difference cylinder under various operating modes.
Although described the present invention in conjunction with above-mentioned preferred embodiment; But will be appreciated that; The present invention is not limited to the disclosed rail pressure fluctuation control gear example that is applied to hydrogen internal combustion engine, and the present invention can also cover various improvement and fall into the spirit of requirement protection of the present invention and the equivalent arrangements in the scope.
Claims (5)
1. rail pressure fluctuation control gear that is used for four cylinder hydrogen internal combustion engines is characterized in that: comprising:
Be arranged on a plurality of hydrogen rail cavity volumes (11 on the hydrogen supply pipeline; 12; 13,14), be communicated with through being communicated with the track series connection between a plurality of hydrogen rail cavity volumes; In a plurality of hydrogen rail cavity volumes each is communicated with the hydrogen nozzle of a corresponding cylinder, and the cross sectional area of hydrogen rail cavity volume is greater than the cross sectional area that is communicated with track.
2. multi-cavity series-mode frame device according to claim 1; It is characterized in that: the volume of a plurality of hydrogen rail cavity volumes differs from one another, wherein should be greater than the corresponding cavity volume volume of other each cylinder nozzle corresponding to the hydrogen rail cavity volume volume of the maximum cylinder of spray nozzle front end pressure surge in the hydrogen supply process.
3. rail pressure fluctuation control gear according to claim 1; It is characterized in that: each hydrogen rail cavity volume be communicated with track has sudden change in the joint cross sectional area; Reflection and interference take place through the connection track of sudden change cross sectional area between each hydrogen rail cavity volume in the pressure wave that produces in the hydrogen injection process in transmittance process, thereby have reduced the nonuniformity of each cylinder hydrogen injection.
4. rail pressure fluctuation control gear according to claim 1 is characterized in that: for satisfying hydrogen internal combustion engine maximum hydrogen traffic demand M
Max, connect the minimum value S of cross sectional area of the connection track of each hydrogen rail cavity volume
MinBe designed to: S
Min=M
Max/ V
Max, V wherein
MaxBe the ducted Peak Flow Rate of hydrogen, connect the maximum value (S of the connecting pipe sectional area of cavity volume at the connection cavity volume
Max) receiving the restriction of rail internal pressure fluctuation, the ratio of cross sectional area and the cross sectional area of the hydrogen rail cavity volume of one of them cylinder that connects the connection track of each hydrogen rail cavity volume is 0.01～0.4.
5. multi-cavity series-mode frame device according to claim 2, it is characterized in that: said internal-combustion engine is a four-cylinder internal combustion engine, the hydrogen rail cavity volume volume that connects the 4th cylinder hydrogen nozzle should be greater than the hydrogen rail cavity volume of the hydrogen nozzle that connects other cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104039276A CN102493902A (en) | 2011-12-05 | 2011-12-05 | Rail pressure fluctuation control device for hydrogen internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104039276A CN102493902A (en) | 2011-12-05 | 2011-12-05 | Rail pressure fluctuation control device for hydrogen internal combustion engine |
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| Publication Number | Publication Date |
|---|---|
| CN102493902A true CN102493902A (en) | 2012-06-13 |
Family
ID=46185754
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104039276A Pending CN102493902A (en) | 2011-12-05 | 2011-12-05 | Rail pressure fluctuation control device for hydrogen internal combustion engine |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327510A (en) * | 1999-10-30 | 2001-12-19 | 罗伯特·博施有限公司 | Fuel injection system for internal combustion engines with a constant overflow oil pressure in the injector |
| JP2004270558A (en) * | 2003-03-10 | 2004-09-30 | Nikki Co Ltd | Fuel injector |
| JP2005090392A (en) * | 2003-09-18 | 2005-04-07 | Nissan Diesel Motor Co Ltd | Fuel injection device of internal combustion engine |
| CN201650504U (en) * | 2010-05-04 | 2010-11-24 | 宁波九天仪表有限公司 | Compressed natural gas spray rail for automobile |
-
2011
- 2011-12-05 CN CN2011104039276A patent/CN102493902A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327510A (en) * | 1999-10-30 | 2001-12-19 | 罗伯特·博施有限公司 | Fuel injection system for internal combustion engines with a constant overflow oil pressure in the injector |
| JP2004270558A (en) * | 2003-03-10 | 2004-09-30 | Nikki Co Ltd | Fuel injector |
| JP2005090392A (en) * | 2003-09-18 | 2005-04-07 | Nissan Diesel Motor Co Ltd | Fuel injection device of internal combustion engine |
| CN201650504U (en) * | 2010-05-04 | 2010-11-24 | 宁波九天仪表有限公司 | Compressed natural gas spray rail for automobile |
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Application publication date: 20120613 |