CN112031955A - High-pressure direct injection natural gas engine air inlet pressure stabilizing device based on variable coherent wavelength - Google Patents
High-pressure direct injection natural gas engine air inlet pressure stabilizing device based on variable coherent wavelength Download PDFInfo
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- CN112031955A CN112031955A CN202010950486.0A CN202010950486A CN112031955A CN 112031955 A CN112031955 A CN 112031955A CN 202010950486 A CN202010950486 A CN 202010950486A CN 112031955 A CN112031955 A CN 112031955A
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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
- F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
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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
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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
- F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
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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
Abstract
The invention discloses a high-pressure direct injection natural gas engine air inlet pressure stabilizing device based on variable coherent wavelength, which comprises a natural gas pressure adjusting unit, a temperature sensor, a buffer tank stop valve, an 1/4 wavelength tube assembly, a pressure sensor, a second high-pressure natural gas pipeline and a 1/4 wavelength tube effective length adjusting device, wherein the temperature sensor is arranged on the natural gas pressure adjusting unit; the first high-pressure natural gas pipeline is sequentially provided with a natural gas pressure regulating unit, a temperature sensor, a second high-pressure natural gas pipeline, an 1/4 wavelength tube assembly and a pressure sensor; one end of the second high-pressure natural gas pipeline is connected with the side opening of the first high-pressure natural gas pipeline, and the other end of the second high-pressure natural gas pipeline is connected with a buffer tank; a buffer tank stop valve is arranged on the second high-pressure natural gas pipeline; the 1/4 wave tube component is provided with a plurality of 1/4 wave tubes, and each 1/4 wave tube is connected with the side opening of the first high-pressure natural gas pipeline; the length of each 1/4 wavelength tube which is connected into the first high-pressure natural gas pipeline is controlled by an 1/4 wavelength tube effective length adjusting device.
Description
Technical Field
The invention belongs to the field of in-cylinder high-pressure direct injection natural gas engines, and particularly relates to an air inlet pressure stabilizing device of a high-pressure direct injection natural gas engine based on a variable coherent wavelength.
Background
The particle emission of the heavy diesel vehicle accounts for more than 70% of the particle emission of the commercial vehicle, and is one of important pollution sources in the large-area fog weather. The main component of natural gas is methane, the carbon smoke generated by combustion is less, and the heavy-duty vehicle using natural gas as fuel can reduce harmful emissions and improve the environment. The high-pressure direct injection natural gas engine in the cylinder sprays natural gas into the cylinder in a high-pressure mode, and a diffusion combustion mode is adopted, so that the limitation of detonation is eliminated, and the heat efficiency of the natural gas engine is improved. In order to provide fuel capacity and safety, in-cylinder high-pressure direct injection natural gas is filled in an LNG tank in a liquid state, the operating pressure of the LNG tank is about 1.5Mpa, LNG (liquefied natural gas) is pressurized to about 30Mpa by a plunger pump, and the pressurized LNG is vaporized and supplied to an in-cylinder high-pressure direct injection natural gas engine. The problem of large pressure fluctuation in the pressurizing process of the plunger pump causes pressure fluctuation in a high-pressure gas circuit, the measurement precision of the flow meter is reduced due to the fluctuation, the gas consumption rate cannot be accurately measured, the actual injection quantity and the theoretical injection quantity of the natural gas have certain difference, the control precision of an electric control system is reduced, and the combustion and the emission of an engine are influenced. From the gas rail pressure data disclosed in the documents of Lebang culvert, Zhang Qiang, Shao Sidong and the like, the idle speed emission characteristic [ J ] of the in-cylinder high-pressure direct injection natural gas engine reported by Shanghai university of transportation 2015(05) 22-25+33 ], and the documents of Lebang culvert, Zhang Qiang, Lizhou Xiang and Shao Sidong, the research on the characteristic combustion parameters outside the in-cylinder high-pressure direct injection natural gas engine [ J ] internal combustion engine engineering 2016(4) 52-56 ], it can be seen that relatively obvious rail pressure fluctuation exists in the injection process.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the technical problem of providing the high-pressure direct injection natural gas engine intake pressure stabilizing device based on the variable coherent wavelength.
The invention provides a high-pressure direct injection natural gas engine air inlet pressure stabilizing device based on variable coherent wavelength, which comprises an LNG tank, an LNG plunger pump, an LNG vaporizer, a first high-pressure natural gas pipeline, an electric control unit, a hydraulic pump flow regulator and a hydraulic pump driving unit, wherein the LNG plunger pump is connected with the LNG vaporizer; the LNG plunger pump is arranged in the LNG tank; the LNG plunger pump is connected with the LNG vaporizer through an LNG high-pressure pipeline; the LNG vaporizer is connected with the high-pressure direct injection natural gas engine through a first high-pressure natural gas pipeline;
the device is characterized by also comprising a natural gas pressure regulating unit, a temperature sensor, a buffer tank stop valve, an 1/4 wavelength tube assembly, a pressure sensor, a second high-pressure natural gas pipeline and a 1/4 wavelength tube effective length regulating device; a natural gas pressure adjusting unit, a temperature sensor, a second high-pressure natural gas pipeline, an 1/4 wavelength tube assembly and a pressure sensor are sequentially arranged on a first high-pressure natural gas pipeline between the LNG vaporizer and the high-pressure direct injection natural gas engine according to the gas flowing direction; the natural gas pressure adjusting unit is arranged behind the LNG vaporizer; one end of the second high-pressure natural gas pipeline is connected with the side opening of the first high-pressure natural gas pipeline, and the other end of the second high-pressure natural gas pipeline is connected with a buffer tank; a buffer tank stop valve is arranged on the second high-pressure natural gas pipeline and is positioned between the side opening of the first high-pressure natural gas pipeline and the buffer tank; the 1/4 wave tube component is provided with a plurality of 1/4 wave tubes, and each 1/4 wave tube is connected with the side opening of the first high-pressure natural gas pipeline; controlling the length of each 1/4 wave tube connected into the first high-pressure natural gas pipeline through an 1/4 wave tube effective length adjusting device; the length of each 1/4 wave tube connected into the first high-pressure natural gas pipeline is the effective length of the 1/4 wave tube;
and the electric control unit is respectively and electrically connected with the natural gas pressure regulating unit, the temperature sensor, the buffer tank stop valve, the pressure sensor and the 1/4 wavelength tube effective length regulating device.
Compared with the prior art, the invention has the beneficial effects that:
(1) the device is provided with the buffer tank and the 1/4 wave tube assembly, the buffer tank and the 1/4 wave tube assembly are used for absorbing fluctuation energy and then are supplied to the cylinder high-pressure direct injection natural gas engine, the influence of pressure fluctuation on the measurement of gas consumption and the control precision of the engine is eliminated or weakened, the accurate measurement of the gas consumption of the engine is realized, the difference between the actual injection quantity of natural gas and the control injection quantity of an electric control system is eliminated, the control precision is improved, and the combustion and the emission are improved.
(2) The buffer tank is used for absorbing a part of fluctuation energy, and the superposition of wave crests and wave troughs is realized through pressure waves reflected by the 1/4 wavelength tube to eliminate or attenuate the pressure fluctuation of different wavelengths in the pipeline, stabilize the supply pressure of natural gas and improve the control precision.
(3) The invention calculates the wavelength change condition according to the running condition of the engine and the material condition of the high-pressure natural gas, and adjusts the effective length of the 1/4 wave pipe to achieve the purpose of eliminating the pressure fluctuation in the pipeline.
Drawings
FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;
in the figure: 1. an LNG tank; 2. an LNG plunger pump; 3. an LNG vaporizer; 4. a first high pressure natural gas line; 5. a natural gas pressure regulating unit; 6. a temperature sensor; 7. a buffer tank; 8. a buffer tank stop valve; 9. 1/4 wavelength tube assembly; 10. a pressure sensor; 11. an effective length adjustment valve; 12. a hydraulic cylinder; 13. an oil inlet electromagnetic valve; 14. an oil outlet electromagnetic valve; 15. a high pressure direct injection natural gas engine; 16. an electronic control unit; 17. a hydraulic pump flow regulator; 18. a hydraulic pump drive unit; 19. a second high pressure natural gas line.
Detailed Description
Specific examples of the present invention are given below. The specific examples are only intended to illustrate the invention in further detail and do not limit the scope of protection of the claims of the present application.
The invention provides a variable coherent wavelength-based high-pressure direct injection natural gas engine air inlet pressure stabilizing device (refer to a device for short, in figure 1), which comprises an LNG tank 1, an LNG plunger pump 2, an LNG vaporizer 3, a first high-pressure natural gas pipeline 4, an electric control unit 16, a hydraulic pump flow regulator 17 and a hydraulic pump driving unit 18, wherein the LNG plunger pump is connected with the LNG plunger pump; the LNG plunger pump 2 is arranged in the LNG tank 1; the LNG plunger pump 2 is connected with the LNG vaporizer 3 through an LNG high-pressure pipeline; the LNG vaporizer 3 is connected with a high-pressure direct injection natural gas engine 15 through a first high-pressure natural gas pipeline 4;
the device is characterized by further comprising a natural gas pressure regulating unit 5, a temperature sensor 6, a buffer tank 7, a buffer tank stop valve 8, an 1/4 wavelength tube assembly 9, a pressure sensor 10, a second high-pressure natural gas pipeline 19 and a 1/4 wavelength tube effective length regulating device; according to the gas flowing direction, the natural gas pressure regulating unit 5 is arranged behind the LNG vaporizer 3, and the natural gas pressure regulating unit 5, the temperature sensor 6, the second high-pressure natural gas pipeline 19, the 1/4 wavelength tube assembly 9 and the pressure sensor 10 are sequentially arranged on the first high-pressure natural gas pipeline 4; one end of the second high-pressure natural gas pipeline 19 is connected with the side opening of the first high-pressure natural gas pipeline 4, and the other end is connected with the buffer tank 7; a buffer tank stop valve 8 is arranged on the second high-pressure natural gas pipeline 19, and the buffer tank stop valve 8 is positioned between the side opening of the first high-pressure natural gas pipeline 4 and the buffer tank 7; 1/4 the wave tube assembly 9 has several 1/4 wave tubes, 1/4 wave tube parameters are selected according to the wave length range of the pressure fluctuation that needs to be eliminated or attenuated, so as to eliminate or attenuate the pressure fluctuation of different wave lengths; each 1/4 wave pipe is connected with a side opening of the first high-pressure natural gas pipeline 4; the length of each 1/4 wave tube inserted into the first high-pressure natural gas pipeline 4, namely the effective length of the 1/4 wave tube, is controlled by an 1/4 wave tube effective length adjusting device;
the electronic control unit 16 is respectively electrically connected with the natural gas pressure regulating unit 5, the temperature sensor 6, the buffer tank stop valve 8, the pressure sensor 10 and the 1/4 wavelength tube effective length regulating device.
Preferably, the 1/4 wavelength tube effective length adjusting device has the function of adjusting the effective length of each 1/4 wavelength tube according to the working condition of the high-pressure direct injection natural gas engine 15, so as to realize the pressure stabilizing effect under different operating conditions, and comprises an effective length adjusting valve 11, a hydraulic oil cylinder 12, an oil inlet electromagnetic valve 13 and an oil outlet electromagnetic valve 14; the hydraulic oil cylinder 12 is externally connected with hydraulic oil through an oil outlet pipeline and an oil inlet pipeline, an oil outlet electromagnetic valve 14 is arranged on the oil outlet pipeline, and an oil inlet electromagnetic valve 13 is arranged on the oil inlet pipeline; the hydraulic oil pressure in the hydraulic oil cylinder 12 is controlled by adjusting the opening and closing degrees of the oil inlet electromagnetic valve 13 and the oil outlet electromagnetic valve 14; each 1/4 wave tube is equipped with an effective length regulating valve 11; each effective length regulating valve 11 extends into the hydraulic oil cylinder 12, and the up-and-down telescopic motion of the effective length regulating valves 11 is controlled by regulating the hydraulic oil pressure in the hydraulic oil cylinders 12.
Preferably, the electronic control unit 16 is electrically connected with the oil inlet solenoid valve 13 and the oil outlet solenoid valve 14 respectively. The electric control unit 16 controls the hydraulic oil pressure in the hydraulic oil cylinder 12 by adjusting the opening and closing degrees of the oil inlet electromagnetic valve 13 and the oil outlet electromagnetic valve 14, further controls the up-and-down telescopic movement of the effective length adjusting valve 11, and further adjusts the effective length of the 1/4 wave tube so as to adapt to different operating conditions of the engine; when the effective length of the 1/4 wave tube needs to be increased, the electronic control unit 16 opens the oil outlet electromagnetic valve 14 to make the hydraulic oil in the hydraulic oil cylinder 12 flow out; when the effective length of the 1/4 wave tube needs to be shortened, the electronic control unit 16 opens the oil inlet solenoid valve 13 to allow hydraulic oil to enter the hydraulic cylinder 12.
Preferably, the electronic control unit 16 is electrically connected with the hydraulic pump flow regulator 17, the high-pressure direct injection natural gas engine 15, the natural gas pressure regulating unit 5, the temperature sensor 6, the buffer tank stop valve 8, the pressure sensor 10, the oil inlet solenoid valve 13 and the oil outlet solenoid valve 14 through control lines respectively.
Preferably, the hydraulic pump driving unit 18 is connected to the LNG plunger pump 2 to drive the LNG plunger pump 2; the hydraulic pump flow regulator 17 is connected to the hydraulic pump drive unit 18, and the hydraulic pump flow regulator 17 controls the rotation speed of the hydraulic pump drive unit 18, and in turn, controls the flow rate of the LNG plunger pump 2.
Preferably, the natural gas pressure regulating unit 5 is a hydraulic pressure regulating device composed of a spring, a slide valve and other mechanical structures, and is used for regulating the pressure of the natural gas.
The temperature sensor 6 is used for monitoring the temperature of the natural gas in real time and assisting in determining the pulse width of the natural gas injection. The buffer tank 7 serves to dampen some of the pressure fluctuations.
Preferably, the electronic control unit 16 is an ECU.
Preferably, the hydraulic pump drive unit 18 is a variable frequency motor.
The operation of the high-pressure direct injection natural gas engine air inlet pressure stabilizing device based on the variable coherent wavelength comprises the following steps:
(1) the buffer tank stop valve 8 is opened, the high-pressure direct injection natural gas engine 15 is started, and the temperature sensor 6 continuously works to measure the temperature value in the first high-pressure natural gas pipeline 4; then the LNG plunger pump 2 works to pressurize the LNG in the LNG tank 1 and then convey the LNG to the LNG vaporizer 3 through the first high-pressure natural gas pipeline 4; the high-pressure direct injection natural gas engine 15 provides heat for LNG vaporization for the LNG vaporizer 3, so that high-pressure LNG is vaporized into high-pressure gaseous natural gas, and then the high-pressure gaseous natural gas is transported through the first high-pressure natural gas pipeline 4 and flows to the high-pressure direct injection natural gas engine 15;
(2) when high-pressure gaseous natural gas passes through the buffer tank 7 and the 1/4 wavelength tube assembly 9, the buffer tank 7 and the 1/4 wavelength tube assembly 9 are used for absorbing fluctuation energy, so that wave crests and wave troughs are superposed to eliminate or attenuate pressure fluctuation in a pipeline; at this time, the effective length of each 1/4 wave pipe in the 1/4 wave pipe assembly 9 is the effective length of the last working condition of the high-pressure direct injection natural gas engine 15;
(3) the pressure sensor 10 measures the pressure in the first high-pressure natural gas pipeline 4 after the surge energy is absorbed by the buffer tank 7 and the 1/4 wavelength tube assembly 9, and transmits the pressure measurement value to the electronic control unit 16; the electronic control unit 16 sends an instruction to the natural gas pressure regulating unit 5 according to the current working condition of the high-pressure direct injection natural gas engine 15 and the pressure measurement value, and the natural gas pressure regulating unit 5 regulates the pressure in the first high-pressure natural gas pipeline 4 to the specified value of the current working condition;
(4) after the pressure in the first high-pressure natural gas pipeline 4 is adjusted, the pressure sensor 10 and the temperature sensor 6 respectively measure a pressure value and a temperature value in the first high-pressure natural gas pipeline 4; the electric control unit 16 controls the pressure of hydraulic oil in the hydraulic oil cylinder 12 by adjusting the opening and closing degrees of the oil inlet electromagnetic valve 13 and the oil outlet electromagnetic valve 14 according to the working condition of the high-pressure direct-injection natural gas engine 15 and the pressure value and the temperature value in the first high-pressure natural gas pipeline 4, further controls the up-and-down telescopic movement of the effective length adjusting valve 11, further adjusts the effective length of each 1/4 wave pipe in the 1/4 wave pipe assembly 9, and realizes the optimal attenuation of pressure fluctuation under the working condition;
(5) the next high pressure direct injection natural gas engine 15 operating condition repeats steps 1) -4).
Nothing in this specification is said to apply to the prior art.
Claims (6)
1. A high-pressure direct injection natural gas engine air inlet pressure stabilizing device based on variable coherent wavelength comprises an LNG tank, an LNG plunger pump, an LNG vaporizer, a first high-pressure natural gas pipeline, an electric control unit, a hydraulic pump flow regulator and a hydraulic pump driving unit; the LNG plunger pump is arranged in the LNG tank; the LNG plunger pump is connected with the LNG vaporizer through an LNG high-pressure pipeline; the LNG vaporizer is connected with the high-pressure direct injection natural gas engine through a first high-pressure natural gas pipeline;
the device is characterized by also comprising a natural gas pressure regulating unit, a temperature sensor, a buffer tank stop valve, an 1/4 wavelength tube assembly, a pressure sensor, a second high-pressure natural gas pipeline and a 1/4 wavelength tube effective length regulating device; a natural gas pressure adjusting unit, a temperature sensor, a second high-pressure natural gas pipeline, an 1/4 wavelength tube assembly and a pressure sensor are sequentially arranged on a first high-pressure natural gas pipeline between the LNG vaporizer and the high-pressure direct injection natural gas engine according to the gas flowing direction; the natural gas pressure adjusting unit is arranged behind the LNG vaporizer; one end of the second high-pressure natural gas pipeline is connected with the side opening of the first high-pressure natural gas pipeline, and the other end of the second high-pressure natural gas pipeline is connected with a buffer tank; a buffer tank stop valve is arranged on the second high-pressure natural gas pipeline and is positioned between the side opening of the first high-pressure natural gas pipeline and the buffer tank; the 1/4 wave tube component is provided with a plurality of 1/4 wave tubes, and each 1/4 wave tube is connected with the side opening of the first high-pressure natural gas pipeline; controlling the length of each 1/4 wave tube connected into the first high-pressure natural gas pipeline through an 1/4 wave tube effective length adjusting device; the length of each 1/4 wave tube connected into the first high-pressure natural gas pipeline is the effective length of the 1/4 wave tube;
and the electric control unit is respectively and electrically connected with the natural gas pressure regulating unit, the temperature sensor, the buffer tank stop valve, the pressure sensor and the 1/4 wavelength tube effective length regulating device.
2. The variable coherence wavelength-based high-pressure direct injection natural gas engine intake pressure stabilizing device according to claim 1, wherein the 1/4 wavelength tube effective length adjusting device comprises an effective length adjusting valve, a hydraulic oil cylinder, an oil inlet electromagnetic valve and an oil outlet electromagnetic valve; the hydraulic oil cylinder is externally connected with hydraulic oil through an oil outlet pipeline and an oil inlet pipeline, an oil outlet electromagnetic valve is arranged on the oil outlet pipeline, and an oil inlet electromagnetic valve is arranged on the oil inlet pipeline; the hydraulic oil pressure in the hydraulic oil cylinder is controlled by adjusting the opening and closing degrees of the oil inlet electromagnetic valve and the oil outlet electromagnetic valve; each 1/4 wave tube is equipped with an effective length regulating valve; each effective length regulating valve extends into the hydraulic oil cylinder, and the telescopic motion of the effective length regulating valves is controlled by regulating the hydraulic oil pressure in the hydraulic oil cylinder.
3. The variable coherence wavelength-based high-pressure direct injection natural gas engine intake pressure stabilizing device according to claim 2, wherein the electronic control unit is electrically connected with the oil inlet electromagnetic valve and the oil outlet electromagnetic valve respectively.
4. The variable coherence wavelength-based intake air pressure stabilizing device of a direct injection natural gas engine according to claim 1, wherein the electronic control unit is electrically connected with the hydraulic pump flow regulator and the direct injection natural gas engine respectively.
5. The variable coherence wavelength-based high-pressure direct injection natural gas engine intake air pressure stabilizing device according to claim 1, wherein the hydraulic pump driving unit is connected with an LNG plunger pump to drive the LNG plunger pump; the hydraulic pump flow regulator is connected with the hydraulic pump driving unit, and the hydraulic pump flow regulator controls the rotating speed of the hydraulic pump driving unit and then controls the flow of the LNG plunger pump.
6. The variable coherence wavelength-based high pressure direct injection natural gas engine intake air pressure stabilizing device of claim 1, wherein the electronic control unit is an ECU.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010950486.0A CN112031955B (en) | 2020-09-11 | 2020-09-11 | High-pressure direct injection natural gas engine air inlet pressure stabilizing device based on variable coherent wavelength |
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| CN202010950486.0A CN112031955B (en) | 2020-09-11 | 2020-09-11 | High-pressure direct injection natural gas engine air inlet pressure stabilizing device based on variable coherent wavelength |
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| CN112031955A true CN112031955A (en) | 2020-12-04 |
| CN112031955B CN112031955B (en) | 2021-06-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112901339A (en) * | 2021-01-15 | 2021-06-04 | 河北工业大学 | Direct injection natural gas engine system based on ammonia pyrolysis device and control method thereof |
| CN114790981A (en) * | 2022-04-20 | 2022-07-26 | 潍柴动力股份有限公司 | Method for preventing short stroke of hydraulic pump of air supply system of HPDI (high performance diesel engine direct) engine |
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| CN211174386U (en) * | 2019-11-27 | 2020-08-04 | 上海交通大学 | Low-pressure gas supply system suitable for small ships |
| CN111536105A (en) * | 2020-05-09 | 2020-08-14 | 潍柴动力股份有限公司 | Method, device and system for adjusting noise reduction wave long tube |
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2020
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| EP1319116A1 (en) * | 2000-09-12 | 2003-06-18 | Sofitech N.V. | Evaluation of multilayer reservoirs |
| CA2421863C (en) * | 2000-09-12 | 2009-05-12 | Schlumberger Canada Limited | Evaluation of multilayer reservoirs |
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| CN207131502U (en) * | 2017-09-16 | 2018-03-23 | 潍柴西港新能源动力有限公司 | Low pressure natural gas recycle device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112901339A (en) * | 2021-01-15 | 2021-06-04 | 河北工业大学 | Direct injection natural gas engine system based on ammonia pyrolysis device and control method thereof |
| CN112901339B (en) * | 2021-01-15 | 2022-04-26 | 河北工业大学 | Direct injection natural gas engine system based on ammonia pyrolysis device and control method thereof |
| CN114790981A (en) * | 2022-04-20 | 2022-07-26 | 潍柴动力股份有限公司 | Method for preventing short stroke of hydraulic pump of air supply system of HPDI (high performance diesel engine direct) engine |
| CN114790981B (en) * | 2022-04-20 | 2024-02-20 | 潍柴动力股份有限公司 | Method for preventing hydraulic pump of HPDI engine air supply system from short stroke |
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| CN112031955B (en) | 2021-06-29 |
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