CN113565626A - Engine system and engine fuel injection method - Google Patents
Engine system and engine fuel injection method Download PDFInfo
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- CN113565626A CN113565626A CN202010352131.1A CN202010352131A CN113565626A CN 113565626 A CN113565626 A CN 113565626A CN 202010352131 A CN202010352131 A CN 202010352131A CN 113565626 A CN113565626 A CN 113565626A
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- 238000002347 injection Methods 0.000 title claims abstract description 36
- 239000007924 injection Substances 0.000 title claims abstract description 36
- 239000000446 fuel Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000002485 combustion reaction Methods 0.000 claims abstract description 165
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 157
- 239000001257 hydrogen Substances 0.000 claims abstract description 100
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 100
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000007921 spray Substances 0.000 claims abstract description 14
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 49
- 238000005507 spraying Methods 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 241000532345 Rallus aquaticus Species 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 7
- 239000002912 waste gas Substances 0.000 claims description 4
- 230000008014 freezing Effects 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 21
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 238000005474 detonation Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 238000005728 strengthening Methods 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
- F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
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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
- F02M21/0206—Non-hydrocarbon fuels, e.g. hydrogen, ammonia or carbon monoxide
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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
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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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/025—Adding water
-
- 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
According to the engine system and the engine fuel injection method provided by the invention, the hydrogen supply device and the water supply device are directly connected with the combustion chamber, hydrogen and water are directly injected into the combustion chamber respectively, and the hydrogen concentration in the combustion chamber can be distributed in a gradient manner by injecting the hydrogen into the combustion chamber at least twice, so that the combustion rate of the hydrogen is controlled to be too fast, further the occurrence of knocking is prevented, and the engine can be in a high-load working environment; furthermore, directly to through water jet equipment water spray in the combustion chamber to control the combustion rate of hydrogen, prevent that the speed of hydrogen burning is too fast, further prevent the emergence of detonation, can also reduce combustion temperature, thereby reduce nitrogen oxide gaseous pollutants's production, still be favorable to strengthening the inflation work simultaneously, improve the thermal efficiency.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an engine system and an engine fuel injection method.
Background
With the increase of the global automobile keeping quantity, the environmental pollution is particularly seriousIs a greenhouse gas (CO)2) Emissions are becoming more and more the focus of public opinion concerns. The traditional internal combustion engine adopts carbon-containing fossil fuel (mainly petroleum products) as an energy source, and inevitably generates a large amount of CO2And (5) discharging. Hydrogen energy has, by its very nature, many advantages over traditional fossil energy sources, such as the absence of carbon atoms, and therefore the production of CO during combustion2And the like.
Hydrogen has two main applications as an automotive energy source, namely fuel cells and hydrogen engines. At present, fuel cells cannot be applied in large-scale industrialization due to the high hydrogen purity and high heat management technical requirements. The hydrogen engine directly adopts hydrogen combustion, has obvious advantages compared with a fuel cell on the requirement of hydrogen purity, can be transformed based on the traditional gasoline engine, and has mature technology compared with the traditional gasoline engine.
Although the hydrogen engine has obvious technical advantages, there are some problems, for example, the abnormal combustion phenomenon of high combustion rate and high combustion temperature easily causes the serious problem of knocking because the hydrogen and air are mixed in advance and then enter the combustion chamber for combustion, and the existing hydrogen engine needs to burn under the condition of relatively thin mixed gas because of the abnormal combustion phenomenon, which greatly limits the power performance and the application prospect of the hydrogen engine, and the abnormal combustion phenomenon of high combustion rate and high combustion temperature causes the emission of pollutants related to temperature to rise sharply.
Disclosure of Invention
An object of the present invention is to provide an engine system to solve the problems of knocking and power limitation of the hydrogen engine in the prior art.
Still another object of the present invention is to provide an engine system to solve the problem of the prior art that the combustion temperature is too high and a large amount of nitrogen oxide pollution gas is generated.
The present invention provides an engine system comprising:
a combustion chamber;
the hydrogen supply device is connected with the combustion chamber and is used for directly injecting hydrogen into the combustion chamber at least twice;
the air supply device is connected with the combustion chamber and is used for supplying air;
a piston connected to the combustion chamber for compressing gas in the combustion chamber; and the number of the first and second groups,
and the ignition device is connected with the combustion chamber and is used for carrying out ignition.
Optionally, in the engine system, the engine system further comprises a water injection device connected to the combustion chamber for injecting water into the combustion chamber at least twice.
Optionally, in the engine system, the water injection device includes a water tank, a water pump, a second pressure sensor, and a water injection nozzle; the water pump is arranged between the water tank and the water spray nozzle; the water spray nozzle is communicated with the combustion chamber; wherein a high pressure water rail is provided between the water spray nozzle and the water pump, and the second pressure sensor is provided on the high pressure water rail to sense the pressure at which water is injected into the combustion chamber.
Optionally, in the engine system, the engine system further comprises a condenser and a first filter; the combustion chamber is connected with the condenser; the condenser is connected with the first filter; the first filter is connected with the water tank.
Optionally, in the engine system, the water injection device further comprises a temperature sensor and a heater; the temperature sensor is arranged in the water tank and used for sensing the temperature of water in the water tank; the heater is connected with the water tank to heat the water in the water tank to prevent the water in the water tank from freezing.
Optionally, in the engine system, the ignition device comprises a spark plug; the spark plug is arranged on the combustion chamber and used for igniting; the hydrogen supply device comprises a hydrogen tank, a gas supply pipeline, a pressure control valve, a first pressure sensor and a hydrogen nozzle; one end of the gas supply pipeline is communicated with the hydrogen tank, and the other end of the gas supply pipeline is communicated with the hydrogen nozzle; the pressure control valve is arranged on the gas supply pipeline; the hydrogen nozzle is in communication with the combustion chamber and is proximate to the spark plug.
In another aspect, the present application further provides a fuel injection method for an engine for ignition control of a combustion chamber of the engine, comprising the steps of:
supply of injection pressure to the engine:
directly drawing air into the combustion chamber;
and directly injecting hydrogen into the combustion chamber at least twice to form mixed gas of air and hydrogen, and enabling the hydrogen concentration in the combustion chamber to be in gradient distribution.
Optionally, after the step of performing at least two direct injections of hydrogen into the combustion chamber to form a mixture of air and hydrogen, and distributing the hydrogen concentration in the combustion chamber in a gradient manner in the engine fuel injection method, the method further comprises the following steps:
spraying water into the combustion chamber for the first time;
igniting the mixed gas;
the ignited mixed gas expands to push the piston to do work.
Optionally, after the step of igniting the mixture gas and before the ignited mixture gas expands to push the piston to do work, the following steps are executed:
and spraying water into the combustion chamber for the second time, wherein the water absorbs the combustion heat in the combustion chamber, is gasified and expanded, and pushes the piston to do work.
Optionally, in the engine fuel injection method, after the ignited mixture expands to push the piston to do work, the following steps are performed:
the engine discharges the waste gas generated after combustion and cools the water vapor in the waste gas into liquid;
filtering the liquid and the waste water generated after combustion, and then entering a water tank in the water spraying device.
Alternatively, in the engine fuel injection method, the step of injecting water into the combustion chamber for the first time may include:
sensing and recording the current water temperature value;
judging whether the temperature value of the water reaches a preset temperature value or not, and if so, spraying water into the combustion chamber for the first time; if not, heating the water until reaching a preset value.
Compared with the prior art, in the engine system provided by the invention, the hydrogen supply device and the air supply device are directly connected with the combustion chamber, hydrogen and air are directly injected into the combustion chamber respectively, and the hydrogen concentration in the combustion chamber can be distributed in a gradient manner by injecting the hydrogen into the combustion chamber at least twice, so that the combustion rate of the hydrogen can be controlled to be too fast, further the occurrence of knocking is prevented, and the large-load working environment of the engine can be realized; furthermore, directly to through water jet equipment water spray in the combustion chamber to control the combustion rate of hydrogen, prevent that the speed of hydrogen burning is too fast, further prevent the emergence of detonation, can also reduce combustion temperature, thereby reduce nitrogen oxide gaseous pollutants's production, still be favorable to strengthening the inflation work simultaneously, improve the thermal efficiency.
Drawings
FIG. 1 is a block diagram of an engine system provided by an embodiment of the present invention;
FIG. 2 is a flow chart of a method of engine fuel injection provided by an embodiment of the present invention;
FIG. 3 is a flow chart of the embodiment of the present invention before a first water injection into the combustion chamber;
wherein the reference numerals of figure 1 are as follows:
10-a combustion chamber;
20-a hydrogen gas supply; 21-a hydrogen tank; 22-a pressure control valve; 23-a hydrogen gas nozzle; 24-a gas supply duct;
30-air supply means; 31-an air duct; 32-a throttle valve;
40-a piston;
50-an ignition device;
60-a water spraying device; 61-a water tank; 62-a water pump; 63-water spray nozzle; 64-high pressure water rail; 65-a second pressure sensor; 66-a heater; 67-temperature sensor;
70-an exhaust gas conduit;
80-a condenser;
90-a first filter;
100-a second filter;
110-air conditioning system.
Detailed Description
To further clarify the objects, advantages and features of the present invention, a detailed description of the proposed engine system and engine fuel injection method will be provided below with reference to fig. 1-3. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
FIG. 1 is a block diagram of an engine system provided by an embodiment of the present invention.
Referring to fig. 1, the present embodiment provides an engine system including: a combustion chamber 10, a hydrogen gas supply means 20, an air supply means 30, a piston 40, and an ignition means 50. The hydrogen supply device 20 is connected to the combustion chamber 10 for directly injecting hydrogen into the combustion chamber 10 at least twice. The air supply device 30 is also directly connected to the combustion chamber 10 for supplying air. The piston is connected with the combustion chamber and is used for compressing gas in the combustion chamber; an ignition device is connected with the combustion chamber for ignition.
Specifically, the air supply device 30 includes an air duct 31 and a throttle 32 disposed on the air duct 31, the air duct 31 connects the combustion chamber 10 with the outside, and the throttle 32 is configured to proportionally open or close the air duct 31 to achieve the purpose of introducing air into the combustion chamber 10 or stopping introducing air. The piston 40 is connected to the combustion chamber 10 for compressing the gas in the combustion chamber 10. The ignition device 50 is connected to the combustion chamber 10, and is used for igniting the hydrogen in the combustion chamber 10 to provide power for the engine.
Through the direct connection of the hydrogen supply device 20 and the air supply device 30 with the combustion chamber 10, hydrogen and air are respectively and directly injected into the combustion chamber 10, and through at least twice injections of the hydrogen into the combustion chamber 10, the hydrogen concentration in the combustion chamber 10 can be distributed in a gradient manner, so that the excessively fast combustion rate of the hydrogen can be prevented from being controlled, namely, knocking is prevented, and the engine can be operated in a high-load working environment.
Further, the engine system further comprises a water spraying device 60, wherein the water spraying device 60 is connected with the combustion chamber 10 and used for spraying water into the combustion chamber 10 at least twice, so that the combustion speed of hydrogen can be controlled, the combustion speed of hydrogen is prevented from being too high, knocking is further prevented, the combustion temperature can be reduced, the generation of nitrogen oxide pollution gas is reduced, expansion work can be enhanced, and the thermal efficiency is improved.
Preferably, the ignition device 50 includes a spark plug, and the spark plug is disposed on the combustion chamber 10 for ignition. The hydrogen supply device 20 includes a hydrogen tank 21, a gas supply pipe 24, a pressure control valve 22, a first pressure sensor, and a hydrogen nozzle 23. One end of the gas supply pipeline 24 is communicated with the hydrogen tank 21, and the other end is communicated with the hydrogen nozzle 23. The hydrogen nozzle 23 communicates with the combustion chamber 10 and is close to the ignition plug. The pressure control valve 22 is arranged on the gas supply pipeline 24 and is used for opening or blocking the gas supply pipeline 24 according to a proportion so as to realize the introduction of hydrogen into the combustion chamber 10 or stop the introduction of hydrogen. Specifically, the pressure control valve 22 is provided with a first pressure sensor (not shown in the figure), and the first pressure sensor senses the pressure of the hydrogen entering the combustion chamber 21, so that the pressure control valve 22 can be controlled to operate according to the pressure sensed by the first pressure sensor. The mode of directly injecting hydrogen in the combustion chamber 10 and combining at least two injections can realize that the hydrogen concentration in the combustion chamber 10 is in gradient distribution, and can realize layered combustion of the hydrogen, the layered combustion mode avoids the problem of backfire of a gas supply pipeline, which is easy to occur when the hydrogen nozzle injects the hydrogen, can alleviate the problem of knocking and prevent pre-ignition, and the power of the hydrogen engine can be further improved.
Wherein the water spray device 60 includes a water tank 61, a water pump 62, a second pressure sensor 65, and a water spray nozzle 63. The water pump 62 is disposed between the water tank 61 and the water spray nozzle 63. The water injection nozzle 63 is communicated with the combustion chamber 10 to inject water into the combustion chamber 10 in the combustion process, so that heat generated by combustion can be further utilized, the combustion working medium in the combustion chamber can be supplemented, and the thermal efficiency of engine combustion is further improved while the power interval is expanded. Preferably, a high pressure water rail 64 is provided between the water injection nozzle 63 and the water pump 62, the high pressure water rail 64 can determine the required optimal injection pressure according to different working conditions, and a second pressure sensor 65 is provided on the high pressure water rail 64, and the second pressure sensor 65 is used for sensing the pressure of water injected into the combustion chamber 10.
The engine system further includes a condenser 80 and a first filter 90. The combustion chamber 10 is connected to the condenser 80 via an exhaust gas line 70; the condenser 80 is connected with the first filter 90, the first filter 90 is connected with the water tank 61, because the temperature of the substance discharged from the combustion chamber 10 is relatively high, and thus, part of water is discharged from the exhaust gas pipeline 70 in a water vapor state, the combustion chamber 10 is connected with the condenser 80, the condenser 80 can cool the water vapor in the exhaust gas into liquid water, and the liquid water is filtered by the first filter 90 and enters the water tank 61, meanwhile, the air conditioning system 110 in the automobile is connected with the water tank 61, and the condensed water in the air conditioning system 110 flows into the water tank 61 after being filtered by the second filter 100, so that the waste of water is avoided, the water supply in the engine system is effectively ensured, the water filling is reduced and even avoided, the water in the water tank 61 is ensured to be pure, and therefore, when the water is recycled, the pollutants are not circulated in the whole engine system.
The water spray device 60 further comprises a temperature sensor 67 and a heater 66; the temperature sensor 67 is disposed in the water tank 61 for sensing the temperature of the water in the water tank 61; the heater 66 is connected to the water tank 61 to heat the water in the water tank 61, and specifically, when the temperature sensor 67 senses that the temperature of the water in the water tank 61 is low, the heater 66 heats the water tank 61 to increase the temperature of the water in the water tank 61, so that not only can the water in the water tank 61 be prevented from freezing due to low temperature, but also excessive heat consumption can be prevented when the water in the water tank 61 is injected into the combustion chamber, and the thermal efficiency of engine combustion is reduced.
Referring to fig. 2, in conjunction with fig. 1, the present embodiment further provides an engine fuel injection method for controlling ignition of a combustion chamber of an engine, including the steps of:
step S110: injection pressure is provided to the engine.
Step S120: air is drawn directly into the combustion chamber 10. Specifically, since the engine provides injection pressure such that the pressure in the combustion chamber 10 is less than atmospheric pressure, the throttle valve 32 is configured to open the air conduit 31 to draw air into the combustion chamber 10.
Step S130: directly injecting hydrogen into the combustion chamber 10 at least twice to form a mixed gas of air and hydrogen, and enabling the hydrogen concentration in the combustion chamber 10 to be in gradient distribution; the hydrogen supply device 20 is used for directly supplying hydrogen to the combustion chamber 10 at least twice to adjust the concentration of hydrogen in the mixed gas, so that high-efficiency and stable combustion of the stable mixed gas can be realized, the problems of rough operation and easy detonation of the engine under the condition of single hydrogen and air proportion are avoided, and the tempering risk caused by advanced premixing of hydrogen and air due to the fact that hydrogen is injected by an air inlet channel is avoided.
Step S140: the water is sprayed into the combustion chamber 10 for the first time, and the water spraying device 60 directly sprays water into the combustion chamber 10 for the first time to control the combustion rate of hydrogen, prevent the combustion speed of hydrogen from being too high, further prevent the occurrence of knocking, and reduce the combustion temperature, thereby reducing the generation of nitrogen oxide pollution gas.
Step S150: igniting the mixed gas, particularly by using an ignition device 50 in an engine system;
step S160: the ignited mixed gas expands to push the piston to do work.
After step S160, step S120 and step S130 may be performed alternately for a plurality of times, that is, after the mixed gas with the hydrogen concentration in the gradient distribution is ignited, a certain amount of air and a certain amount of hydrogen are continuously and alternately injected, so that the hydrogen concentration in the combustion chamber is always in the gradient distribution, thereby continuously providing the combustion energy to the engine.
Hydrogen and air are directly injected into the combustion chamber 10, and after at least two times of injecting the hydrogen into the combustion chamber 10, the hydrogen concentration in the combustion chamber 10 can be distributed in a gradient manner, so that the phenomenon that the combustion rate of the hydrogen is too fast is controlled, namely knocking is prevented, and the engine can work in a high-load working environment; furthermore, water is directly sprayed into the combustion chamber 10 through the water spraying device 60 to control the combustion rate of hydrogen, prevent the combustion speed of hydrogen from being too high, further prevent the occurrence of knocking, and reduce the combustion temperature, thereby reducing the generation of nitrogen oxide polluted gas, enhancing expansion work and improving the heat efficiency.
In one embodiment of the present application, after the step S150 of igniting the mixture gas, and before the step S160 of expanding the ignited mixture gas to push the piston to do work, the following steps are performed:
the water is sprayed into the combustion chamber 10 for the second time, specifically, the water is sprayed into the combustion chamber 10 for the second time by the water spraying device 60. The water absorbs the combustion heat in the combustion chamber, and the water is gasified and expanded to push the piston to do work, so that the heat efficiency is improved.
After step S160, that is, after the ignited mixed gas expands to push the piston to do work, the method may further include the following steps:
the engine discharges the exhaust gas generated after combustion, and cools the water vapor in the exhaust gas into liquid through the condenser 80; therefore, the exhaust gas can be prevented from circulating in the engine system, and the water in the gas state can be changed into the water in the liquid state, so that the water in the engine system can be recycled.
The liquid and the water produced after combustion enter a first filter 90 for purification and then enter a water tank 61 in a water injector 60 to enable water in the engine system to be recycled.
Referring to fig. 3, in conjunction with fig. 1, the step of spraying water to the combustion chamber 10 for the first time further includes the sub-steps of:
substep S141: the current water temperature value is sensed and recorded and the water temperature is sensed by the temperature sensor 67 in the water jet 60.
Substep S142: judging whether the temperature value of the water reaches a preset temperature value or not, if so, spraying water into the combustion chamber for the first time by the water spraying device; and if not, heating the water by a heater in the water spraying device until a preset value is reached.
By controlling the temperature of the water in the water tank 61, it is ensured that the temperature of the water injected into the combustion chamber 10 is not too low to consume too much heat energy in the combustion chamber, or the temperature of the water injected into the combustion chamber 10 is too high, which is advantageous for preventing the knocking function and reducing the generation of nitrogen oxide pollution gas.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (11)
1. An engine system, comprising:
a combustion chamber;
the hydrogen supply device is connected with the combustion chamber and is used for directly injecting hydrogen into the combustion chamber at least twice;
the air supply device is connected with the combustion chamber and is used for supplying air;
a piston connected to the combustion chamber for compressing gas in the combustion chamber; and the number of the first and second groups,
and the ignition device is connected with the combustion chamber and is used for carrying out ignition.
2. The engine system of claim 1, further comprising a water injection device coupled to the combustion chamber for injecting water into the combustion chamber at least twice.
3. The engine system of claim 2, wherein the water injection device comprises a water tank, a water pump, a second pressure sensor, and a water injection nozzle; the water pump is arranged between the water tank and the water spray nozzle; the water spray nozzle is communicated with the combustion chamber; wherein a high pressure water rail is provided between the water spray nozzle and the water pump, and the second pressure sensor is provided on the high pressure water rail to sense the pressure at which water is injected into the combustion chamber.
4. The engine system of claim 3, further comprising a condenser and a first filter; the combustion chamber is connected with the condenser; the condenser is connected with the first filter; the first filter is connected with the water tank.
5. The engine system of claim 3, wherein the water injection device further comprises a temperature sensor and a heater; the temperature sensor is arranged in the water tank and used for sensing the temperature of water in the water tank; the heater is connected with the water tank to heat the water in the water tank to prevent the water in the water tank from freezing.
6. The engine system of claim 1, wherein said ignition device comprises a spark plug; the spark plug is arranged on the combustion chamber and used for igniting; the hydrogen supply device comprises a hydrogen tank, a gas supply pipeline, a pressure control valve, a first pressure sensor and a hydrogen nozzle; one end of the gas supply pipeline is communicated with the hydrogen tank, and the other end of the gas supply pipeline is communicated with the hydrogen nozzle; the pressure control valve is arranged on the gas supply pipeline; the hydrogen nozzle is in communication with the combustion chamber and is proximate to the spark plug.
7. A fuel injection method for an engine for ignition control of a combustion chamber of the engine, comprising the steps of:
supply of injection pressure to the engine:
directly drawing air into the combustion chamber;
and directly injecting hydrogen into the combustion chamber at least twice to form mixed gas of air and hydrogen, and enabling the hydrogen concentration in the combustion chamber to be in gradient distribution.
8. The engine fuel injection method of claim 7, wherein after performing at least two direct injections of hydrogen into said combustion chamber to form a mixture of air and hydrogen and to provide a gradient distribution of hydrogen concentration in said combustion chamber, further comprising the steps of:
spraying water into the combustion chamber for the first time;
igniting the mixed gas;
the ignited mixed gas expands to push the piston to do work.
9. The engine fuel injection method of claim 8, wherein after the step of igniting the mixture, and before the ignited mixture expands to push a piston to do work, the following steps are performed:
and spraying water into the combustion chamber for the second time, wherein the water absorbs the combustion heat in the combustion chamber, is gasified and expanded, and pushes the piston to do work.
10. The engine fuel injection method of claim 8, wherein after said mixture expands after ignition pushing a piston to do work, the following steps are performed:
the engine discharges the waste gas generated after combustion and cools the water vapor in the waste gas into liquid;
filtering the liquid and the waste water generated after combustion, and then entering a water tank in the water spraying device.
11. The engine fuel injection method of claim 8, wherein the step of injecting water into the combustion chamber a first time comprises:
sensing and recording the current water temperature value;
judging whether the temperature value of the water reaches a preset temperature value or not, and if so, spraying water into the combustion chamber for the first time; if not, heating the water until reaching a preset value.
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| CN202010352131.1A CN113565626A (en) | 2020-04-28 | 2020-04-28 | Engine system and engine fuel injection method |
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| CN202010352131.1A CN113565626A (en) | 2020-04-28 | 2020-04-28 | Engine system and engine fuel injection method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114991946A (en) * | 2022-05-16 | 2022-09-02 | 王立臣 | Hydrogen-oxygen cycle engine and use method thereof |
| CN115419523A (en) * | 2022-08-29 | 2022-12-02 | 中南大学 | Hydrogen internal combustion engine control device based on controllable activity of mixed gas |
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