CN117552897A - Natural gas engine low-pressure injection system - Google Patents
Natural gas engine low-pressure injection system Download PDFInfo
- Publication number
- CN117552897A CN117552897A CN202310381459.XA CN202310381459A CN117552897A CN 117552897 A CN117552897 A CN 117552897A CN 202310381459 A CN202310381459 A CN 202310381459A CN 117552897 A CN117552897 A CN 117552897A
- Authority
- CN
- China
- Prior art keywords
- gas
- pressure
- rail
- engine
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000002347 injection Methods 0.000 title claims abstract description 30
- 239000007924 injection Substances 0.000 title claims abstract description 30
- 239000003345 natural gas Substances 0.000 title claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 133
- 239000000446 fuel Substances 0.000 abstract description 27
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000004043 responsiveness Effects 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
-
- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
-
- 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
Abstract
The invention relates to a low-pressure injection system of a natural gas engine, which comprises a gas nozzle, a gas filter, a pressure limiting valve and a gas rail, wherein the gas nozzle is connected with the gas filter; according to the invention, a multi-point injection technology is adopted, the independent fuel nozzles are arranged on the branch pipes of the air inlet manifold of each cylinder, and each cylinder performs independent fuel injection during working, so that the fuel nozzles and the fuel pressure requirements are reduced, the fuel control is more accurate, the fuel nozzles are arranged on the cylinder cover, the time for fuel to enter the cylinder can be shortened, and the engine responsiveness is improved; the gas rail stores low-pressure stabilized gas, the pressure limiting valve controls the flow of the gas flowing through, the gas pressure in the gas rail is stably controlled at the set low-pressure, the pressure limiting valve adjusts the gas pressure and flow, the gas rail pressure and temperature sensor is matched with the gas rail pressure and temperature sensor to stably control the gas rail gas pressure at the set low-pressure, and the multi-point injection system is matched to realize gas low-pressure.
Description
Technical Field
The invention relates to the technical field of manufacturing of new energy automobiles, in particular to a low-pressure injection system of a natural gas engine.
Background
At present, a single-point injection technology is adopted in all natural gas engines, natural gas fuel and air form gas mixture in a mixer on an engine air inlet manifold, and the mixed gas enters the engine air inlet manifold and then enters each cylinder to participate in combustion. In order to meet the requirements of large discharge capacity, high power and large torque of a heavy natural gas engine, the single-point injection technology needs to adopt a gas nozzle with larger flow, the large-flow nozzle has the defects of large technical difficulty, high cost, insufficient flow control precision and the like, and the large-flow nozzle needs to be matched with higher gas pressure, so that the low pressure of a gas system is not facilitated. The mixing of the air inlet header pipes can lead to that no matter which stroke the engine is in, the gas mixture exists in the branch pipes of the air inlet manifold of each cylinder, and when the valve overlap angle is very easy to occur, part of natural gas overflows from the exhaust valve, so that the emission and the economy of the engine are reduced, and meanwhile, the time for the gas mixture to reach each cylinder is different due to the fact that the distance between the air inlet header pipe mixer and each cylinder is different, so that the combustion performance of the engine is reduced.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and further provides a low-pressure injection system of a natural gas engine, which adopts a multi-point injection technology, and performs independent fuel injection per cylinder during working, so that the injection flow of a single nozzle is reduced, the pressure requirement of a fuel system is reduced, the fuel control is more accurate, the volume utilization rate of a gas cylinder is improved, and the economy and the emission performance of the engine are improved.
The invention is realized by adopting the following technical scheme:
a natural gas engine low pressure injection system comprising: the gas filter comprises a gas nozzle, a gas filter, a pressure limiting valve and a gas rail;
the gas inlet manifold branch pipes on the cylinders of the engine are communicated with each other and provided with gas nozzles, a plurality of gas nozzles and gas filters are respectively connected with a gas rail pipeline, and a pressure limiting valve is arranged at the joint of the gas filters and the gas rail pipeline.
Preferably, cylinder covers are respectively arranged on the cylinders of the engine, and the gas nozzles are arranged on the cylinder covers.
Preferably, a cylinder cover air inlet is arranged on the cylinder cover.
Preferably, the branch pipe of the air inlet manifold is provided with a check valve.
Preferably, a nozzle air supply pipe is arranged between the gas nozzle and the gas rail.
Preferably, two gas rail air inlet pipes are arranged between the pressure limiting valve and the gas rail.
Preferably, a gas pressure temperature sensor is arranged on the gas rail.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, a multi-point injection technology is adopted, the independent fuel nozzles are arranged on the branch pipes of the air inlet manifold of each cylinder, and each cylinder performs independent fuel injection during working, so that the fuel nozzles and the fuel pressure requirements are reduced, the fuel control is more accurate, the fuel nozzles are arranged on the cylinder cover, the time for fuel to enter the cylinder can be shortened, and the engine responsiveness is improved;
the invention stores low-pressure stabilized gas in the gas rail, the pressure limiting valve controls the flow of the gas flowing through, the pressure of the gas in the gas rail is stably controlled at the set low-pressure, the pressure limiting valve adjusts the pressure and flow of the gas, the gas pressure of the gas rail is stably controlled at the set low-pressure by being matched with the pressure temperature sensor of the gas rail, and the gas is reduced by being matched with the multi-point injection system.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of a low pressure injection system of a natural gas engine according to the present invention;
fig. 2 is a schematic diagram of a low-pressure injection system of a natural gas engine, which is provided by the invention and is installed on the engine.
Description of the reference numerals
1. A gas filter; 2. a pressure limiting valve; 3. an air rail air inlet pipe; 4. a gas rail; 5. a nozzle air supply pipe; 6. a gas nozzle; 7. a one-way valve; 8. a cylinder cover air inlet; 9. a cylinder cover; 10. a gas pressure and temperature sensor.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other. In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1-2, a low pressure injection system for a natural gas engine, comprising: the gas filter 1, the pressure limiting valve 2, the gas rail gas inlet pipe 3, the gas rail 4, the nozzle gas supply pipe 5, the gas nozzle 6, the one-way valve 7, the cylinder cover gas inlet 8, the cylinder cover 9 and the gas pressure temperature sensor 10; the gas nozzles 6 and the gas filter 1 are respectively connected with the gas rail 4 in a pipeline manner, and the connection part of the gas filter 1 and the gas rail 4 is provided with the pressure limiting valve 2.
Specifically, the gas nozzles 6 are communicated and arranged on the branch pipes of the air inlet manifold of each cylinder of the engine, fuel is independently supplied to each cylinder, fuel is precisely distributed and injected, the economy of the engine is improved, the fuel injection quantity of a single nozzle and the requirement on the gas pressure can be reduced by multi-point injection, and the low pressure of the gas is realized;
specifically, the cylinder covers 9 are arranged on the cylinders of the engine, and the fuel gas nozzles 6 are arranged on the cylinder covers 9, so that the time for fuel to enter the cylinders can be shortened, and the responsiveness of the engine can be improved;
specifically, a check valve 7 is arranged on an air inlet manifold branch pipe on each cylinder of the engine, a plurality of air inlet manifolds are communicated with each cylinder of the engine, gas can only enter a cylinder cover 9 along the air inlet manifolds through a cylinder cover air inlet 8 and cannot flow in the opposite direction, so that the gas injected by a gas nozzle 6 cannot flow back into the air inlet manifolds, explosion danger cannot be caused when an air inlet heating grid is arranged in the air inlet manifolds, and meanwhile, fuel waste can be reduced;
specifically, the gas rail 4 stores low-pressure stabilized gas, a nozzle gas supply pipe 5 is arranged between the gas nozzle 6 and the gas rail 4, and is used for independently supplying gas to each nozzle, so that the gas supply is sufficient.
Specifically, a gas pressure temperature sensor 10 is arranged on the gas rail 4, the gas pressure temperature in the gas rail 4 is fed back to an engine ECU, and the engine ECU adjusts the electromagnetic valve of the pressure limiting valve 2 to control the flow of gas flowing through according to the gas pressure temperature signal in the gas rail 4, so that the gas pressure in the gas rail 4 is stably controlled at a set low pressure.
Specifically, two gas rail air inlet pipes 3 are arranged between the pressure limiting valve 2 and the gas rail 4, and when the gas demand of the engine under the heavy load working condition is large, sufficient gas is provided for the gas rail 4, so that the gas pressure in the gas rail 4 is ensured to be stable.
Working principle: the natural gas in the gas cylinder for the vehicle enters the gas rail 4 through the pressure limiting valve 2 by the gas filter 1, the gas pressure temperature sensor 10 is installed on the gas rail 4, the gas pressure temperature signal in the gas rail 4 is fed back to the engine ECU, the engine ECU adjusts the pressure limiting valve 2 according to the gas pressure temperature signal, the gas flow flowing through is controlled by the electromagnetic valve of the pressure limiting valve 2, the gas pressure in the gas rail 4 is stably controlled at the set low pressure, the pressure-stabilizing low-pressure gas enters the gas nozzle 6 through the nozzle gas supply pipe 5, fuel is independently provided for each cylinder, fuel injection is accurately controlled, meanwhile, the demand of the gas nozzle 6 on the gas pressure is reduced, the check valve 7 is arranged on the branch pipe of the gas inlet manifold, and danger and fuel waste caused by fuel backflow entering the gas inlet manifold are prevented.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The low-pressure injection system of the natural gas engine is characterized by comprising a gas nozzle (6), a gas filter (1), a pressure limiting valve (2) and a gas rail (4);
the engine is characterized in that a gas nozzle (6) is communicated with an air inlet manifold branch pipe on each cylinder of the engine, a plurality of gas nozzles (6) and a gas filter (1) are respectively connected with a gas rail (4) through pipelines, and a pressure limiting valve (2) is arranged at the joint of the gas filter (1) and the gas rail (4) through the pipelines.
2. A natural gas engine low pressure injection system as claimed in claim 1, characterized in that a cylinder head (9) is provided on each cylinder of the engine, respectively, the gas nozzle (6) being provided on the cylinder head (9).
3. A natural gas engine low pressure injection system as claimed in claim 2, characterized in that the cylinder head (9) is provided with a head inlet (8).
4. A low pressure injection system for a natural gas engine as claimed in claim 1, characterized in that the manifold branch has a non-return valve (7).
5. A natural gas engine low pressure injection system as claimed in claim 1, characterized in that a nozzle gas supply pipe (5) is arranged between the gas nozzle (6) and the gas rail (4).
6. A low-pressure injection system of a natural gas engine as claimed in claim 1, characterized in that two gas rail inlet pipes (3) are arranged between the pressure limiting valve (2) and the gas rail (4).
7. A natural gas engine low pressure injection system as claimed in claim 1, characterized in that the gas rail (4) is provided with a gas pressure temperature sensor (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310381459.XA CN117552897A (en) | 2023-04-11 | 2023-04-11 | Natural gas engine low-pressure injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310381459.XA CN117552897A (en) | 2023-04-11 | 2023-04-11 | Natural gas engine low-pressure injection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117552897A true CN117552897A (en) | 2024-02-13 |
Family
ID=89822123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310381459.XA Pending CN117552897A (en) | 2023-04-11 | 2023-04-11 | Natural gas engine low-pressure injection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117552897A (en) |
-
2023
- 2023-04-11 CN CN202310381459.XA patent/CN117552897A/en active Pending
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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