CN114046217B - Direct-injection fuel gas nozzle in electric control cylinder of diesel engine and complete machine control method thereof - Google Patents
Direct-injection fuel gas nozzle in electric control cylinder of diesel engine and complete machine control method thereof Download PDFInfo
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- CN114046217B CN114046217B CN202111232548.5A CN202111232548A CN114046217B CN 114046217 B CN114046217 B CN 114046217B CN 202111232548 A CN202111232548 A CN 202111232548A CN 114046217 B CN114046217 B CN 114046217B
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- 238000002347 injection Methods 0.000 title claims abstract description 64
- 239000007924 injection Substances 0.000 title claims abstract description 64
- 239000002737 fuel gas Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 157
- 239000000446 fuel Substances 0.000 claims abstract description 49
- 239000002283 diesel fuel Substances 0.000 claims description 42
- 238000007789 sealing Methods 0.000 claims description 34
- 238000002485 combustion reaction Methods 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- 239000007921 spray Substances 0.000 claims description 10
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 6
- 239000003063 flame retardant Substances 0.000 claims description 6
- 230000001050 lubricating effect Effects 0.000 claims description 6
- 238000007790 scraping Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 3
- 238000005461 lubrication Methods 0.000 abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003912 environmental pollution Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000002803 fossil fuel Substances 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
- F02M43/04—Injectors peculiar thereto
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/401—Controlling injection timing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
-
- 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
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention provides a direct injection fuel gas nozzle in an electric control cylinder of a diesel engine and a complete machine control method thereof, and particularly relates to a direct injection fuel gas nozzle design in the electric control cylinder of the diesel engine and a complete machine operation control method of the direct injection fuel gas nozzle in the electric control cylinder of the diesel engine. The direct injection fuel gas nozzle in the cylinder adopts the piston friction pair structure to realize direct injection in the gas fuel cylinder of the diesel engine nozzle, solves the problems of lubrication and cooling of the fuel gas nozzle through reasonable oil inlet and return and fuel gas pipeline design, and ensures the reliability and durability of the fuel gas nozzle; meanwhile, the invention provides a control method for the operation of the whole diesel engine electric control cylinder direct injection gas nozzle, and the stable operation of the diesel engine gas nozzle and the whole diesel engine is realized through the specific control of the electric control unit.
Description
Technical Field
The invention provides a direct injection fuel gas nozzle in an electric control cylinder of a diesel engine and a complete machine control method thereof, in particular relates to a direct injection fuel gas nozzle design in the electric control cylinder of the diesel engine and a complete machine operation control method of the direct injection fuel gas nozzle in the electric control cylinder of the diesel engine, and belongs to the field of internal combustion engines.
Background
The problem of environmental pollution is becoming a focus of attention nowadays, and with the development of global new energy automobile technology, the development of new energy electric automobiles, fuel cell automobiles and hybrid electric automobiles reduces environmental pollution to a certain extent, but the above various types of automobiles still have the defect compared with the reciprocating internal combustion engine automobiles, and the conservation amount of the reciprocating internal combustion engine automobiles is still the first place in the world in the past. How to reduce the exhaust pollutant emission of the reciprocating internal combustion engine automobile has great significance for reducing environmental pollution and realizing carbon neutralization in the early days.
Reciprocating internal combustion engine automobiles have been developed for hundreds of years from birth, and because the special crank-connecting rod mechanism of the reciprocating internal combustion engine automobiles skillfully converts rotary inertia force into reciprocating inertia force and outputs work, sufficient power is provided for the automobiles. In the current international large environment, reducing the oil consumption and the emission of a reciprocating internal combustion engine is still the primary problem for promoting the sustainable development of an internal combustion engine automobile. Traditional fossil fuels are difficult to realize low-carbon emission and even zero-carbon emission due to the limitations of the components and chemical structures of the traditional fossil fuels. Compared with the traditional fossil fuel, the gaseous clean fuel such as hydrogen, natural gas and the like can effectively reduce tail gas pollution. However, unlike liquid fuels, how to be able to inject gaseous fuel directly into the cylinders and to ensure stable operation of the engine is a problem that is currently in need of solution.
Based on the related problems faced by the reciprocating internal combustion engine, the invention designs a direct injection gas nozzle in an electric control cylinder of a diesel engine and provides a control method for the whole machine operation of the direct injection gas nozzle in the electric control cylinder of the diesel engine based on the design basis of the diesel engine nozzle. According to the invention, the direct injection in the fuel cylinder of the diesel engine nozzle is realized by adopting the piston friction pair, and the lubrication and cooling problems of the fuel gas nozzle are solved by reasonable oil inlet and return and fuel gas pipeline design; meanwhile, the invention realizes the stable operation of the gas nozzle and the whole engine of the diesel engine through the control of the electric control unit, effectively reduces the environmental pollution caused by the reciprocating internal combustion engine, and provides possibility for the realization of the direct injection engine in the gas fuel cylinder.
Disclosure of Invention
The direct injection gas nozzle in the electric control cylinder of the diesel engine mainly comprises a lock nut 2, a fuel injector body 3, an oil return port 4, an oil return duct 5, a gas spray head 6, a piston cylinder 7, a piston sealing ring 8, a tappet 9, a plunger spring 10, a plunger 11, an oil inlet duct 12, an oil inlet 13, an adjusting gasket 14, a middle disc 15, an oil return orifice 16, a ball valve 17, a gas pipeline 18 and a gas inlet 19;
the diesel engine associated with the operation of the gas nozzle 1 mainly comprises: a gas inlet pipeline P1, on which a gas bottle 20, a pressure reducing valve 21, a gas flow sensor 22 and a flame-retardant valve 23 are arranged in sequence; an air intake pipe P2 on which an air cleaner 24, a throttle valve 25, an intake air flow sensor 26, and an intake air pressure sensor 27 are sequentially provided; a diesel supply pipeline P3, on which a diesel tank 32, a diesel filter 31, an oil delivery pump 30, and a high-pressure common rail 29 are sequentially arranged; the diesel returns to the diesel oil tank 32 through an oil return pipeline P4, and an oxygen concentration sensor 33, a spark plug 28, a rotating speed sensor 34, a crank shaft position sensor 35 and an electronic control unit ECU36 are arranged on an exhaust pipeline P5;
the electronic control unit ECU36 receives the gas flow signal b, the intake air flow signal c, the crank position signal d, the intake air pressure signal e, the exhaust oxygen concentration signal h, the rotation speed signal i, the high-pressure common rail pressure signal j, and sends out a throttle opening signal a, a gas injection signal f and a spark plug ignition signal g.
The direct injection fuel gas nozzle in the diesel engine electric control cylinder comprises the following operation and control processes:
the external main body of the gas nozzle consists of a lock nut 2, a fuel injector body 3 and a gas nozzle 6, wherein the fuel injector body 3 is provided with an oil inlet 13, an oil return opening 4 and a gas inlet 19, the oil return opening 4 is communicated with an oil return duct 5, the oil inlet 13 is communicated with an oil inlet duct 12, and the gas inlet 19 is communicated with a gas pipeline 18; simultaneously, the oil inlet 13 and the oil return port 4 are connected with an external diesel oil supply pipeline, and the gas inlet 19 is connected with a gas bottle through a gas supply pipeline; an oil inlet duct 12, an oil return duct 5 and a gas pipeline 18 are correspondingly arranged in the oil sprayer body 3, a solenoid valve controls a ball valve 17 to rise and fall in the gas nozzle, an oil return cavity is formed between the upper part of a middle disc 15 and the oil return duct, the lower part of the middle disc 15 is connected with a plunger 11, a plunger spring 10 at the bottom of the plunger 11 is contacted with a tappet 9, and an oil inlet cavity is formed between a groove on the tappet 9 and the bottom end of the oil inlet duct 12; the lower end of the tappet is provided with a piston type friction pair which consists of a piston type cylinder 7 and three piston type sealing rings 8, the piston type sealing rings can effectively separate fuel gas and diesel oil in the running process, the functions of sealing, lubricating and oil scraping are achieved, the diameter of the piston type cylinder 7 is larger than that of a fuel gas spray hole at the head of a fuel gas spray head 6, and the piston type friction pair can effectively prevent the leakage of fuel gas in the fuel gas stopping process;
the three piston type sealing rings of the piston type friction pair are used for sealing diesel oil, the upper sealing ring is used for sealing gas fuel, the middle sealing ring plays a secondary sealing role to block the contact between the diesel oil and the gas, and the reciprocating motion of the piston type sealing ring can play a role in scraping oil and lubricating so as to prevent the piston type friction pair from being excessively worn;
the gas nozzle covers all gas types, such as hydrogen, natural gas, ammonia, etc.
According to the design of the direct injection fuel gas nozzle in the electric control cylinder of the diesel engine, the whole control process is as follows:
in the running process of the engine, fresh air sequentially passes through an air filter 24, a throttle valve 25, an air inlet flow sensor 26 and an air inlet pressure sensor 27 to enter the cylinder through an air inlet pipeline P2, an electronic control unit ECU36 judges the running load of the engine through an air inlet flow signal c and an air inlet pressure signal e, the running speed of the engine is determined through a rotating speed signal i output by a rotating speed sensor 34, so that the specific running working condition of the engine is obtained, the injection pulse width of gas fuel is determined, meanwhile, the electronic control unit ECU36 determines the gas fuel injection timing through a crankshaft position signal d output by a crankshaft position sensor 35, the gas fuel is conveyed to a gas inlet 19 of a gas nozzle 1 through a gas bottle 20, a pressure reducing valve 21, a gas flow sensor 22 and a flame retardant valve 23, high-pressure diesel is conveyed to an oil inlet 13 of the gas nozzle 1 through a diesel oil tank 32, a diesel filter 31, an oil conveying pump 30 and a high-pressure common rail 29, and the electronic control unit ECU36 sends a gas fuel injection signal f to control the gas fuel injection timing, and the upper electric duration of the electromagnetic valve corresponds to the gas fuel injection pulse width;
and (3) fuel gas injection control: the electronic control unit ECU36 controls the solenoid valve to be electrified, the ball valve 17 is jacked by high-pressure diesel oil in the gas nozzle 1, the diesel oil flows into an oil return cavity through the oil return orifice 16, the diesel oil in the oil return cavity flows out of the oil injector body through the oil return port 4 by the oil return duct 5, at the moment, the oil inlet cavity and the oil return cavity form hydraulic pressure difference, the diesel oil flows into the high-pressure oil inlet cavity through the oil inlet duct 12 by the oil inlet 13, the tappet 9 and the plunger 11 are jacked upwards, the tappet 9 is separated from the piston friction pair, the gas fuel is conveyed to the lower part of the piston friction pair through the gas inlet 19 and the gas pipeline 18, the piston friction pair is jacked upwards by means of gas supply pressure, and the gas is injected into the combustion chamber of the engine through the gas injection hole at the head part of the gas nozzle 6, so that the gas fuel injection is realized; and (3) fuel gas stopping and spraying control: the electric control unit controls the electromagnetic valve to stop being electrified, the ball valve 17 is seated to cause the oil return throttle hole 16 to be closed, the pressure at the upper end of the plunger 11 is higher than that at the lower end, the tappet 9 and the piston friction pair are pushed to move downwards, the lower end face of the piston friction pair covers the fuel gas spray hole, and fuel injection is stopped;
after the gas fuel injection is finished, diesel oil flows back to the diesel oil tank 32 through the oil return pipeline P4, then the electronic control unit ECU36 sends out an ignition signal g of the spark plug 28 to ignite the mixed gas in the cylinder, the tail gas after combustion is discharged into the atmosphere through the exhaust pipeline P5, and the electronic control unit ECU36 adjusts the air inflow of the next circulating air and the gas by receiving an oxygen concentration signal h output by the oxygen concentration sensor 33 on the exhaust pipeline, so that the complete machine control of the direct injection gas nozzle in the electronic control cylinder of the diesel engine is realized.
The beneficial effects of the invention are mainly as follows: according to the direct injection fuel gas nozzle in the cylinder, the direct injection in the fuel cylinder of the diesel engine nozzle is realized by adopting a piston type friction pair structure, the lubrication and cooling problems of the fuel gas nozzle are solved by reasonable oil inlet and return and fuel gas pipeline design, and the reliability and durability of the fuel gas nozzle are ensured; meanwhile, the invention provides a control method for the whole machine operation of the direct injection fuel gas nozzle in the electric control cylinder of the diesel engine, and the stable operation of the fuel gas nozzle and the whole machine of the diesel engine is realized through the specific control of the electric control unit, so that the possibility is provided for the realization of the direct injection engine in the gas fuel cylinder.
Drawings
FIG. 1 is a schematic diagram of a gas nozzle; FIG. 2 is a diagram of a piston friction pair component; FIG. 3 is a gas burner part diagram; FIG. 4 is a schematic diagram of the whole machine
In the figure: 1. the fuel gas injection nozzle, 2, lock nut, 3, oil injector body, 4, oil return port, 5, oil return channel, 6, gas injection nozzle, 7, piston cylinder, 8, piston seal ring, 9, tappet, 10, plunger spring, 11, plunger, 12, oil inlet channel, 13, oil inlet, 14, adjusting gasket, 15, middle disc, 16, oil return orifice, 17, ball valve, 18, gas pipe, 19, gas inlet, 20, gas cylinder, 21, pressure reducing valve, 22, gas flow sensor, 23, flame retardant valve, 24, air filter, 25, throttle valve, 26, intake flow sensor, 27, intake pressure sensor, 28, spark plug, 29, high pressure common rail, 30, oil delivery pump, 31, diesel filter, 32, diesel oil tank, 33, oxygen concentration sensor, 34, rotation speed sensor, 35, crank shaft position sensor, 36, electronic control unit ECU;
a. and sending out throttle opening signals, b, gas flow signals, c, air inlet flow signals, d, crankshaft position signals, e, air inlet pressure signals, f, gas injection signals, g, spark plug ignition signals, h, exhaust oxygen concentration signals, i, rotating speed signals, j and high-pressure common rail pressure signals.
Detailed Description
The invention is further described with reference to the drawings and detailed description which follow:
the external main body of the gas nozzle consists of a lock nut 2, a fuel injector body 3 and a gas nozzle 6, wherein the fuel injector body 3 is provided with an oil inlet 13, an oil return opening 4 and a gas inlet 19, the oil return opening 4 is communicated with an oil return duct 5, the oil inlet 13 is communicated with an oil inlet duct 12, and the gas inlet 19 is communicated with a gas pipeline 18; simultaneously, the oil inlet 13 and the oil return port 4 are connected with an external diesel oil supply pipeline, and the gas inlet 19 is connected with a gas bottle through a gas supply pipeline; an oil inlet duct 12, an oil return duct 5 and a gas pipeline 18 are correspondingly arranged in the oil sprayer body 3, a solenoid valve controls a ball valve 17 to rise and fall in the gas nozzle, an oil return cavity is formed between the upper part of a middle disc 15 and the oil return duct, the lower part of the middle disc 15 is connected with a plunger 11, a plunger spring 10 at the bottom of the plunger 11 is contacted with a tappet 9, and an oil inlet cavity is formed between a groove on the tappet 9 and the bottom end of the oil inlet duct 12; the lower end of the tappet is provided with a piston type friction pair which consists of a piston type cylinder 7 and three piston type sealing rings 8, the piston type sealing rings can effectively separate fuel gas and diesel oil in the running process, the functions of sealing, lubricating and oil scraping are achieved, the diameter of the piston type cylinder 7 is larger than that of a fuel gas spray hole at the head of a fuel gas spray head 6, and the piston type friction pair can effectively prevent the leakage of fuel gas in the fuel gas stopping process;
the three piston type sealing rings of the piston type friction pair are used for sealing diesel oil, the upper sealing ring is used for sealing gas fuel, the middle sealing ring plays a secondary sealing role to block the contact between the diesel oil and the gas, and the reciprocating motion of the piston type sealing ring can play a role in scraping oil and lubricating so as to prevent the piston type friction pair from being excessively worn;
the gas nozzle covers all gas types, such as hydrogen, natural gas, ammonia, etc.
According to the design of the direct injection fuel gas nozzle in the electric control cylinder of the diesel engine, the whole control process is as follows:
in the running process of the engine, fresh air sequentially passes through an air filter 24, a throttle valve 25, an air inlet flow sensor 26 and an air inlet pressure sensor 27 to enter the cylinder through an air inlet pipeline P2, an electronic control unit ECU36 judges the running load of the engine through an air inlet flow signal c and an air inlet pressure signal e, the running speed of the engine is determined through a rotating speed signal i output by a rotating speed sensor 34, so that the specific running working condition of the engine is obtained, the injection pulse width of gas fuel is determined, meanwhile, the electronic control unit ECU36 determines the gas fuel injection timing through a crankshaft position signal d output by a crankshaft position sensor 35, the gas fuel is conveyed to a gas inlet 19 of a gas nozzle 1 through a gas bottle 20, a pressure reducing valve 21, a gas flow sensor 22 and a flame retardant valve 23, high-pressure diesel is conveyed to an oil inlet 13 of the gas nozzle 1 through a diesel oil tank 32, a diesel filter 31, an oil conveying pump 30 and a high-pressure common rail 29, and the electronic control unit ECU36 sends a gas fuel injection signal f to control the gas fuel injection timing, and the upper electric duration of the electromagnetic valve corresponds to the gas fuel injection pulse width;
and (3) fuel gas injection control: the electronic control unit ECU36 controls the solenoid valve to be electrified, the ball valve 17 is jacked by high-pressure diesel oil in the gas nozzle 1, the diesel oil flows into an oil return cavity through the oil return orifice 16, the diesel oil in the oil return cavity flows out of the oil injector body through the oil return port 4 by the oil return duct 5, at the moment, the oil inlet cavity and the oil return cavity form hydraulic pressure difference, the diesel oil flows into the high-pressure oil inlet cavity through the oil inlet duct 12 by the oil inlet 13, the tappet 9 and the plunger 11 are jacked upwards, the tappet 9 is separated from the piston friction pair, the gas fuel is conveyed to the lower part of the piston friction pair through the gas inlet 19 and the gas pipeline 18, the piston friction pair is jacked upwards by means of gas supply pressure, and the gas is injected into the combustion chamber of the engine through the gas injection hole at the head part of the gas nozzle 6, so that the gas fuel injection is realized; and (3) fuel gas stopping and spraying control: the electric control unit controls the electromagnetic valve to stop being electrified, the ball valve 17 is seated to cause the oil return throttle hole 16 to be closed, the pressure at the upper end of the plunger 11 is higher than that at the lower end, the tappet 9 and the piston friction pair are pushed to move downwards, the lower end face of the piston friction pair covers the fuel gas spray hole, and fuel injection is stopped;
after the gas fuel injection is finished, diesel oil flows back to the diesel oil tank 32 through the oil return pipeline P4, then the electronic control unit ECU36 sends out an ignition signal g of the spark plug 28 to ignite the mixed gas in the cylinder, the tail gas after combustion is discharged into the atmosphere through the exhaust pipeline P5, and the electronic control unit ECU36 adjusts the air inflow of the next circulating air and the gas by receiving an oxygen concentration signal h output by the oxygen concentration sensor 33 on the exhaust pipeline, so that the complete machine control of the direct injection gas nozzle in the electronic control cylinder of the diesel engine is realized.
Claims (1)
1. The utility model provides a diesel engine electronic control in-cylinder direct injection gas nozzle which characterized in that, gas nozzle (1) includes: the oil-return type oil-saving device comprises a lock nut (2), an oil injector body (3), an oil return port (4), an oil return channel (5), a gas nozzle (6), a piston cylinder (7), a piston type sealing ring (8), a tappet (9), a plunger spring (10), a plunger (11), an oil inlet channel (12), an oil inlet (13), an adjusting gasket (14), a middle disc (15), an oil return orifice (16), a ball valve (17), a gas pipeline (18) and a gas inlet (19); the diesel engine associated with the operation of the gas nozzle (1) mainly comprises: the gas inlet pipeline P1 is sequentially provided with a gas cylinder (20), a pressure reducing valve (21), a gas flow sensor (22) and a flame retardant valve (23); an air inlet pipeline P2, on which an air filter (24), a throttle valve (25), an air inlet flow sensor (26) and an air inlet pressure sensor (27) are arranged in sequence; a diesel oil supply pipeline P3, on which a diesel oil tank (32), a diesel oil filter (31), an oil delivery pump (30) and a high-pressure common rail (29) are sequentially arranged; the diesel returns to the diesel oil tank (32) through a diesel oil return pipeline P4, and an oxygen concentration sensor (33), a spark plug (28), a rotating speed sensor (34), a crankshaft position sensor (35) and an electronic control unit ECU (36) are arranged on an exhaust pipeline P5;
the electronic control unit ECU (36) is connected with the throttle valve (25) and controls the throttle valve opening through a throttle valve opening signal a;
the electronic control unit ECU (36) is connected with the gas flow sensor (22) and obtains a gas flow signal b;
the electronic control unit ECU (36) is connected with the air inlet flow sensor (26) and obtains an air inlet flow signal c;
the electronic control unit ECU (36) is connected with the crankshaft position sensor (35) and obtains a crankshaft position signal d;
the electronic control unit ECU (36) is connected with the air inlet pressure sensor (27) and obtains an air inlet pressure signal e;
the electronic control unit ECU (36) is connected with the gas nozzle (1) and controls the gas nozzle to be opened and closed through a gas injection signal f;
the electronic control unit ECU (36) is connected with the spark plug (28) and controls the ignition timing of the spark plug through a spark plug ignition signal g;
the electronic control unit ECU (36) is connected with the oxygen concentration sensor (33) and obtains an exhaust oxygen concentration signal h;
the electronic control unit ECU (36) is connected with the rotating speed sensor (34) and obtains a rotating speed signal i;
the electronic control unit ECU (36) is connected with the high-pressure common rail (29) and obtains a rail pressure signal j;
the external main body of the gas nozzle comprises a lock nut (2), an oil sprayer body (3) and a gas nozzle (6); an oil inlet (13), an oil return port (4) and a gas inlet (19) are formed in the oil sprayer body (3), an oil inlet channel (12), an oil return channel (5) and a gas pipeline (18) are formed in the oil sprayer body (3), the oil return port (4) is communicated with the oil return channel (5), the oil inlet (13) is communicated with the oil inlet channel (12), the gas inlet (19) is communicated with the gas pipeline (18), meanwhile, the oil inlet (13) is connected with an external diesel oil supply pipeline P3, the oil return port (4) is connected with the external diesel oil return pipeline P4, and the gas inlet (19) is connected with a gas bottle through a gas inlet pipeline P1;
the oil sprayer comprises an oil sprayer body (3), wherein a ball valve (17), an oil return orifice (16), a middle disc (15), an adjusting gasket (14), a plunger (11), a plunger spring (10), a tappet (9), a piston type sealing ring (8) and a piston type cylinder (7) are sequentially arranged at the inner axis position of the oil sprayer body (3), the oil return orifice (16) is arranged at the center position of the middle disc (15), the lower part of the middle disc (15) is connected with the plunger (11), the adjusting gasket (14) is sleeved at the upper end of the plunger (11), the plunger spring (10) is sleeved at the lower end of the plunger (11), the lower surface of the plunger spring (10) is in contact with the upper surface of the tappet (9), the lower surface of the tappet (9) is in contact with the upper surface of the piston type cylinder (7), the piston type sealing ring (8) is sleeved on the piston type cylinder (7), and the lower surface of the piston type cylinder (7) is in contact with the inner surface of a gas sprayer (6); an electromagnetic valve in the gas nozzle sends a signal through an electronic control unit ECU (36) to control the lifting of the ball valve (17); an oil return cavity is formed between the upper part of the middle disc (15) and the upper end of the oil return channel (5), and an oil inlet cavity is formed between a groove on the tappet (9) and the lower end of the oil inlet channel (12);
the lower end of the tappet (9) is provided with a piston type friction pair which consists of a piston type cylinder (7) and three piston type sealing rings (8), the piston type sealing rings effectively separate fuel gas and diesel oil in the operation process, the functions of sealing, lubricating and scraping oil are achieved, the diameter of the piston type cylinder (7) is larger than the diameter of a fuel gas spray hole at the head of a fuel gas spray nozzle (6), and the piston type friction pair prevents the leakage of fuel gas in the fuel gas stop and spray process; the three piston type sealing rings of the piston type friction pair are used for sealing diesel oil, the upper sealing ring is used for sealing gas fuel, the middle sealing ring plays a secondary sealing role to block the contact between the diesel oil and the gas, and the reciprocating motion of the piston type sealing ring plays a role in scraping oil and lubricating so as to prevent the piston type friction pair from being excessively worn;
the whole machine control process is as follows:
in the running process of the engine, fresh air sequentially passes through an air filter (24), a throttle valve (25), an air inlet flow sensor (26) and an air inlet pressure sensor (27) from an air inlet pipeline P2, the running load of the engine is judged by an electric control unit ECU (36) through an air inlet flow signal c and an air inlet pressure signal e, the running speed of the engine is determined by receiving a rotating speed signal i output by a rotating speed sensor (34), so that the specific running condition of the engine is obtained, the injection pulse width of gas fuel is determined, meanwhile, the electric control unit ECU (36) determines the gas fuel injection timing through a crankshaft position signal d output by a crankshaft position sensor (35), the gas fuel is conveyed to a gas inlet (19) of a gas nozzle (1) through a gas bottle (20), a pressure reducing valve (21), a gas flow sensor (22) and a flame retardant valve (23), high-pressure diesel is conveyed to a gas inlet (13) of the nozzle (1) through a diesel tank (32), a diesel oil conveying pump (30) and a high-pressure common rail (29), and the electric control unit ECU (36) sends a gas fuel injection signal f to control the gas fuel injection timing, and the gas fuel injection timing corresponds to the gas fuel injection duration on the electromagnetic valve;
and (3) fuel gas injection control: an electronic control unit ECU (36) controls the solenoid valve to be electrified, a ball valve (17) is jacked up by high-pressure diesel oil in an oil inlet channel (12) in a gas nozzle (1), the diesel oil flows into an oil return cavity from an oil inlet (13) along the oil inlet channel (12) through an oil return orifice (16), and the diesel oil in the oil return cavity flows into a diesel oil return pipeline through an oil return port (4) through an oil return channel (5); in the process, an oil inlet cavity and an oil return cavity form a hydraulic pressure difference, a tappet (9) and a plunger (11) are jacked upwards, the tappet (9) is separated from a piston type friction pair, gas fuel is conveyed to the lower part of the piston type friction pair through a gas inlet (19) and a gas pipeline (18), the piston type friction pair is jacked upwards by means of gas supply pressure, and at the moment, gas is injected into an engine combustion chamber through a gas injection hole at the head part of a gas nozzle (6) to realize gas fuel injection;
and (3) fuel gas stopping and spraying control: an electronic control unit ECU (36) controls the electromagnetic valve to stop electrifying, the ball valve (17) falls down to be contacted with the middle disc (15) again, at the moment, the oil return throttle hole (16) is closed, the pressure at the upper end of the plunger (11) is higher than that at the lower end, the tappet (9) and the piston type friction pair are pushed to move downwards, the lower end face of the piston type friction pair covers the fuel injection hole, and fuel injection is stopped;
after the gas fuel injection is finished, diesel oil flows back to a diesel oil tank (32) through a diesel oil return pipeline P4, an electronic control unit ECU (36) sends an ignition signal g of a spark plug (28) to ignite the mixed gas in the cylinder, the tail gas after combustion is discharged into the atmosphere through an exhaust pipeline P5, and the electronic control unit ECU (36) adjusts the air inflow of the next circulating air and fuel gas by receiving an oxygen concentration signal h output by an oxygen concentration sensor (33) on an exhaust pipeline, so that the complete machine control of a direct injection fuel gas nozzle in the electronic control cylinder of the diesel engine is realized.
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| JPH08144884A (en) * | 1994-11-24 | 1996-06-04 | Nissan Motor Co Ltd | Direct injection type gasoline internal combustion engine |
| JP2003214295A (en) * | 2003-02-03 | 2003-07-30 | Hitachi Ltd | Fuel injection valve |
| CN102562328A (en) * | 2012-02-22 | 2012-07-11 | 北京工业大学 | Diesel engine system capable of being powered by mixed DME (dimethyl ether) gas and control method |
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| CN105888858A (en) * | 2016-06-27 | 2016-08-24 | 北京工业大学 | Single-nozzle direct injection gas-liquid fuel spark ignition type internal combustion engine and control method thereof |
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Patent Citations (5)
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| JPH08144884A (en) * | 1994-11-24 | 1996-06-04 | Nissan Motor Co Ltd | Direct injection type gasoline internal combustion engine |
| JP2003214295A (en) * | 2003-02-03 | 2003-07-30 | Hitachi Ltd | Fuel injection valve |
| CN102562328A (en) * | 2012-02-22 | 2012-07-11 | 北京工业大学 | Diesel engine system capable of being powered by mixed DME (dimethyl ether) gas and control method |
| CN103089505A (en) * | 2013-01-21 | 2013-05-08 | 江苏大学 | Device and method capable of achieving natural gas and diesel double-fuel jet |
| CN105888858A (en) * | 2016-06-27 | 2016-08-24 | 北京工业大学 | Single-nozzle direct injection gas-liquid fuel spark ignition type internal combustion engine and control method thereof |
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