CN108194207A - A kind of internal-combustion engine variable compression ratio system and internal combustion engine - Google Patents
A kind of internal-combustion engine variable compression ratio system and internal combustion engine Download PDFInfo
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- CN108194207A CN108194207A CN201810138602.1A CN201810138602A CN108194207A CN 108194207 A CN108194207 A CN 108194207A CN 201810138602 A CN201810138602 A CN 201810138602A CN 108194207 A CN108194207 A CN 108194207A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 81
- 230000006835 compression Effects 0.000 title claims abstract description 71
- 238000007906 compression Methods 0.000 title claims abstract description 71
- 239000000446 fuel Substances 0.000 claims description 35
- 239000000295 fuel oil Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000003921 oil Substances 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 6
- 235000019441 ethanol Nutrition 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000008246 gaseous mixture Substances 0.000 abstract description 12
- 239000007789 gas Substances 0.000 description 29
- 230000000694 effects Effects 0.000 description 16
- 238000002347 injection Methods 0.000 description 14
- 239000007924 injection Substances 0.000 description 14
- 230000008859 change Effects 0.000 description 12
- 238000000889 atomisation Methods 0.000 description 10
- 238000011217 control strategy Methods 0.000 description 7
- 239000002912 waste gas Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0223—Variable control of the intake valves only
- F02D13/0226—Variable control of the intake valves only changing valve lift or valve lift and 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2700/00—Mechanical control of speed or power of a single cylinder piston engine
- F02D2700/03—Controlling by changing the compression ratio
- F02D2700/035—Controlling by changing the compression ratio without modifying the volume of the compression space, e.g. by changing the valve timing
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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
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a kind of internal-combustion engine variable compression ratio system and internal combustion engines, are related to internal combustion engine auxiliary system field.The system includes assistant connecting pipe, auxiliary port and variable auxiliary valve；Auxiliary port is arranged in the cylinder head with cylinders, auxiliary port is connected by assistant connecting pipe with air intake branch, variable auxiliary valve is assemblied in auxiliary port, variable auxiliary valve maximum lift corresponds respectively to 0.3~0.5 times of inlet valve maximum lift and longest duration with the longest duration, variable auxiliary valve is driven by variable valve system, and variable valve system is connect with ECU；Under high load capacity steady working condition, ECU energy output orders control variable auxiliary valve to be opened at compression initial stage to the variable valve timing of variable valve system；Special ratios gaseous mixture can be stored between auxiliary port and air intake duct for working cycles next time, reduce internal combustion engine effective compression ratio；The internal combustion engine includes above-mentioned internal-combustion engine variable compression ratio system, prevents the engine knocks under high load capacity steady working condition.
Description
Technical field
The present invention relates to internal combustion engine auxiliary system field, more particularly to a kind of internal-combustion engine variable compression ratio system and internal combustion
Machine.
Background technology
After compression ratio refers to that piston moves to top dead centre by lower dead center, the compression degree of cylinder interior gas；EGR refers to internal combustion
Machine after combustion isolates the part for discharging gas and importing air inlet side makes it burn once again.Multi-injection technology can be with
Change the trade-off relation of conventional engines NOx and PM discharges.
In order to improve fuel economy, detonation is prevented, reduces Engine Emissions, researchers propose variable compressive
Than EGR Technology, multi-injection technology, wherein variable compression ratio structure design is complex, internal EGR control accuracy
It is short of, external eGR structure and controller are complex, and multi-injection is higher to system requirements.Compression ratio is to internal combustion engine
Energy important, compression ratio is higher, and the thermal efficiency is higher, and variable compression ratio wishes that internal combustion engine possesses higher in underload
Compression ratio so as to improve internal combustion engine thermal efficiency and fuel economy, is easy to startup of catching fire；Internal combustion engine possesses relatively low during big load
Compression ratio prevents engine knocks, protects engine.And EGR can control burn rate to realize low-temperature burning, internally
Combustion engine pollutant NOxDischarge have good abated effect to a certain extent, the wherein control strategy of EGR is：Cold is idle
When fast EGR close or it is a small amount of open, accelerate or low cruise control period EGR is opened in a small amount slight, EGR should during moderate duty
Dosage is higher.When engine calls are high-power, high rotating speed when to ensure that engine has good dynamic property that should close or make on a small quantity
Use EGR；Multi-injection can realize comparatively ideal combustion curve.
Invention content
In order to overcome the problems of the above-mentioned prior art, the purpose of the present invention is to provide a kind of compressions of internal-combustion engine variable
Than system and internal combustion engine, realize in high load capacity steady working condition, using changeable compression ratio technique, possess low effective compression ratio,
Engine knocks are prevented, protect internal combustion engine.
The present invention is to be achieved through the following technical solutions：
The invention discloses a kind of internal-combustion engine variable compression ratio system, including assistant connecting pipe, auxiliary port and variable auxiliary
Help valve；Auxiliary port is arranged in the cylinder head with cylinders, and auxiliary port passes through assistant connecting pipe and air intake branch phase
Even, variable auxiliary valve is assemblied in auxiliary port, variable auxiliary valve maximum lift and longest duration correspond respectively into
Valve maximum lift and 0.3~0.5 times of the longest duration, variable auxiliary valve is driven by variable valve system, changeable air valve
System is connect with ECU；Wherein, under high load capacity steady working condition, ECU is for output order to variable valve system, changeable air valve
The variable valve timing of system controls variable auxiliary valve to be opened at compression initial stage.
Preferably, under middle-low load steady working condition, ECU energy output orders are to variable valve system, variable valve system
Variable valve timing variable auxiliary valve is controlled to be opened in the forced exhaust stage.
Preferably, assistant connecting pipe is the reducing pipe with volume, wherein, the necking end and air intake branch of assistant connecting pipe
Connection, the one end of assistant connecting pipe far from necking end is connect with auxiliary port.
Preferably, assistant connecting pipe is equipped with flow sensor, and flow sensor flows through the gas of auxiliary port for measuring
Body flow, flow sensor are connect with ECU, wherein, the flow signal of flow sensor is the closed-loop control system being arranged in ECU
The input signal of system.
Preferably, inlet valve includes being respectively assembled at inlet valve one and inlet valve two in air intake duct, inlet valve one and into
Valve two by camshaft actuated, wherein, ECU can output order to variable valve system, the changeable air valve of variable valve system
The variable auxiliary valve of timing control is opened at air inlet initial stage.
Preferably, fuel injector is equipped in auxiliary port, injector is connect with oil supply system, and oil supply system is controlled with ECU
Unit connects, wherein, fuel injector is single fuel or double fuel fuel injector and sprays liquid before air inlet initial stage.
It is further preferred that the liquid is the one or more of fuel oil, water or ethyl alcohol.
Preferably, the exhaust duct being located in cylinder head is further included, main exhaust valve is equipped in exhaust duct, exhaust duct is connected with
Exhaust branch pipe, exhaust branch pipe are connect with exhaust main.
The invention also discloses a kind of internal combustion engine, including above-mentioned internal-combustion engine variable compression ratio system.
Compared with prior art, the present invention has technique effect beneficial below：
A kind of internal-combustion engine variable compression ratio system disclosed by the invention, including assistant connecting pipe, auxiliary port and variable auxiliary
Help valve；Auxiliary port is connected with air inlet pipe by assistant connecting pipe, variable auxiliary valve maximum lift and longest continue
Phase corresponds to 0.3~0.5 times of inlet valve maximum lift and longest duration respectively, and variable auxiliary valve is driven by variable valve system
Dynamic, variable valve system is connect with ECU, and conducive under high load capacity steady working condition, ECU output orders, can to variable valve system
The variable valve timing of air valve variation system controls variable auxiliary valve to be opened at compression initial stage, and the gaseous mixture of special ratios (considers
Residual waste gas quantity) auxiliary port and air intake duct can be stored in, it is steady so as to reduce high load capacity for the use of working cycles next time
Determine the internal combustion engine effective compression ratio under operating mode, reduce pinking tendency protection internal combustion engine.
Further, under middle-low load steady working condition, the variable valve timing of variable valve system can control variable auxiliary
Valve is helped to be opened in the forced exhaust stage, conducive under middle-low load steady working condition, is opened in forced exhaust stage variable auxiliary valve
It opens a part of exhaust gas of receiving and is used for working cycles next time, realize the change of EGR rate and keep original high compression ratio, and EGR
Burn rate can be controlled, and reduces oxygen concentration and maximum combustion temperature in cylinder and, to realize low-temperature burning, reaches reduction NOxDischarge
Effect, keep original high compression ratio, the thermal efficiency and fuel economy under internal combustion engine middle-low load steady working condition can be improved.
Further, assistant connecting pipe is the reducing pipe with volume, and necking end and the air intake branch of assistant connecting pipe connect
It connects, the one end of assistant connecting pipe far from necking end is connect with auxiliary port, and conducive to necking effect is generated, necking effect can make this portion
The incoming mixture of storage is divided to generate acceleration when subsequent work is recycled into cylinder, there can be injection work to laggard air inlet
With being improved the effect of intake efficiency.
Further, the flow sensor being equipped with by assistant connecting pipe, the flow signal of flow sensor is setting
The input signal of closed-loop control system in ECU, the gas flow of auxiliary port is flowed through convenient for measurement (will flow into gas in cylinder
Body flow), it sends gas flow signals to ECU, variable valve system is issued instructions to by ECU, variable valve system
Variable valve timing controls variable auxiliary valve lifts to change and (is opened in forced exhaust stage variable auxiliary valve and receive a part
Exhaust gas is for working cycles next time) it realizes and improves EGR precision and the original high compression ratio of holding.
Further, by valve actuator convenient for driving inlet valve one and inlet valve two；Pass through control strategy, that is, ECU
Output order controls variable auxiliary valve to be opened in the charging stage to variable valve system, the variable valve timing of variable valve system
It opens, so as to fulfill three inlet valves (inlet valve one, inlet valve two and a variable auxiliary valve), increases air-flow by area, carry
High intake efficiency.
Further, fuel injector is equipped in auxiliary port, fuel injector is for single fuel or double fuel fuel injector and in air inlet
Liquid is sprayed before initial stage；It is further preferred that liquid is the one or more of fuel oil, water or ethyl alcohol, conducive in EGR processes
Middle realization secondary injection improves the atomization quality of this part fuel oil using exhaust gas temperature, and internal combustion engine NOx pollutants are emitted on
There is good abated effect to a certain extent.
Further, by exhaust branch pipe, integral arrangement is reasonable.
The invention also discloses a kind of internal combustion engines, and including above-mentioned internal-combustion engine variable compression ratio system, the internal combustion engine, structure is set
Meter is reasonable, can realize in high load capacity steady working condition, there is low effective compression ratio, prevents engine knocks, protects internal combustion
Machine.
Description of the drawings
Fig. 1 is the structure schematic top plan view of the present invention；
Fig. 2 is the control strategy schematic diagram of the present invention.
Wherein：1st, cylinder head；2nd, cylinder；3rd, air intake branch；4th, air intake duct；5th, inlet valve one；6th, inlet valve two；7th, it is vented
Branch pipe；8th, exhaust duct；9th, main exhaust valve；10th, assistant connecting pipe；11st, auxiliary port；12nd, variable auxiliary valve；13rd, flow passes
Sensor；14th, injector.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
Referring to Fig. 1 and Fig. 2, a kind of internal-combustion engine variable compression ratio and EGR regulating systems, including cylinder head 1, cylinder 2, air inlet
Branch pipe 3, air intake duct 4, inlet valve 1, inlet valve 26, exhaust branch pipe 7, exhaust duct 8, main exhaust valve 9, assistant connecting pipe 10 are auxiliary
Help air flue 11, variable auxiliary valve 12 and flow sensor 13；
Cylinder head 1 is set on the cylinder 2, and air intake duct 4, exhaust duct 8 and auxiliary port 11 are arranged in cylinder head 1, into
Gas branch pipe 3 is connected by the air intake duct 4 in cylinder head 1 with cylinder 2, and inlet valve 1 and inlet valve 26 are respectively assembled at air intake duct
In 4, inlet valve 1 and inlet valve 26 are driven by general cam axis, and exhaust branch pipe 7 is connected by exhaust duct 8 with cylinder 2, exhaust
Branch pipe 7 is connect with exhaust main, and assistant connecting pipe 10 is connected by the auxiliary port 11 in cylinder head 1 with cylinder 2, variable auxiliary
Valve 12 is assemblied in auxiliary port 11, is to drive by redesigning the cam of camshaft molded line of variable auxiliary valve 12
Based on the cam of camshaft of inlet valve, the cam of camshaft type for obtaining redesigning variable auxiliary valve 12 is reduced in proportion
Line, at the same former camshaft (camshaft of inlet valve) is determined port timing, the camshaft angle of action, valve size, valve
Opening speed and seating velocity, contact stress make appropriate Optimized Matching, and it is inlet valve to make variable 12 maximum lift of auxiliary valve
0.3~0.5 times of maximum lift, variable 12 longest duration of auxiliary valve are 0.3~0.5 times of inlet valve longest duration,
Variable auxiliary valve 12 is driven by variable valve system, and variable valve system is connect with ECU；Assistant connecting pipe 10 is with certain
The reducing pipe of volume, the necking end of assistant connecting pipe 10 are connected to air intake branch 3, the one end of assistant connecting pipe 10 far from necking end
It is connected with air intake branch 3, the gaseous mixture compressed in tapered assistant connecting pipe 10 (considers residual waste gas quantity, but most of is new
Fresh air) having fraction of speed increase, (necking effect can make the gaseous mixture of this section store be recycled into gas in subsequent work
Acceleration is generated during cylinder 2), there can be ejector action to laggard air inlet, slightly improve intake efficiency；It is set on assistant connecting pipe 10
There is flow sensor 13, flow sensor 13 flows through the gas flow of auxiliary port 11, flow sensor 13 and ECU for measuring
Connection, wherein, the flow signal of flow sensor 13 is the input signal for the closed-loop control system being arranged in ECU, by auxiliary
The flow sensor 13 that connecting tube 10 is equipped with is helped, the gas flow that auxiliary port 11 is flowed through convenient for measurement (discharges into gas in cylinder 2
Body flow), it sends gas flow signals to ECU, variable valve system is issued instructions to by ECU, pass through changeable air valve system
The lift range variable of system controls variable 12 lift of auxiliary valve to change, and (in the forced exhaust stage, the variable unlatching of auxiliary valve 12 connects
By a part of exhaust gas for working cycles next time) it realizes and improves EGR precision and the original high compression ratio of holding.Wherein, in height
Under steady load operating mode, ECU can output order to variable valve system, the variable valve timing control of variable valve system is variable
Auxiliary valve 12 is opened at compression initial stage, (considers residual waste gas quantity, but big so as to compress the gaseous mixture of initial stage (air inlet end of a period)
Majority is fresh air) it is stored between auxiliary port 11 and air intake duct 4, use (a job for working cycles next time
4 strokes are recycled, air inlet is compressed, and is done work, and exhaust, next working cycles are just repeated once, since air inlet), so as to drop
Low internal combustion engine effective compression ratio prevents engine knocks, protects internal combustion engine；Under middle-low load steady working condition, variable gas
The variable valve timing of door system can control variable auxiliary valve 12 to be opened in the forced exhaust stage, stablize work conducive to middle-low load
Under condition, opened in forced exhaust stage variable auxiliary valve 12 and receive a part of exhaust gas for working cycles next time, realize EGR
The change of rate and the original high compression ratio of holding, and EGR can control burn rate, and reduce oxygen concentration and highest in cylinder 2
For ignition temperature to realize low-temperature burning, reaching reduces NOxThe effect of discharge keeps original high compression ratio, can improve internal combustion engine
The thermal efficiency and fuel economy under middle-low load steady working condition.
Internal combustion engine in system is double inlet valves：Inlet valve 1, inlet valve 26；Single valve：Main exhaust valve 9, it is additional
One variable auxiliary valve 12；Changed by control strategy be ECU output orders to variable valve system, variable valve system
Variable valve timing controls variable auxiliary valve 12 to be opened at air inlet initial stage, so as to fulfill three inlet valves (inlet valve 1, air inlet
Door 26 and a variable auxiliary valve 12), air-flow is increased by area, improves intake efficiency；This can be selected in variable valve system
The VTEC mechanisms of Tian companies；Fuel injector 14 is equipped in auxiliary port 11, injector 14 is connect with oil supply system, oil supply system with
ECU control units connect, wherein, fuel injector 13 is single fuel or double fuel fuel injector and sprays liquid before air inlet initial stage,
Conducive to realizing secondary injection during EGR, fuel oil enter in auxiliary port 11 and air intake duct 4 with EGR exhaust carry out it is good
Atomization is realized that similar Divided combustion chamber burns, the atomization quality of this part fuel oil is improved using exhaust gas temperature, ensures fuel spray
Change effect；Temperature in cylinder 2 is reduced, has good abated effect to a certain extent to the discharge of internal combustion engine NOx pollutants, together
When keep the original compression ratio of internal combustion engine, so as to improve the thermal efficiency, improve the emission performance of internal combustion engine.
Referring to Fig. 2 control strategies schematic diagram (valve lift curve), in internal combustion engine high load capacity steady working condition, control strategy
It is：Change the variable valve timing of variable valve system, make the variable compression ratio lifting curve duration of variable auxiliary valve 12
Be moved to compression travel initial stage (suction stroke end of a period), receive a part of gaseous mixture (gaseous mixture be stored in auxiliary port 11 and into
Working cycles use next time is used between air flue 4), so as to reduce the effective compression ratio of internal combustion engine；In internal combustion engine middle-low load
During steady working condition, technical solution is used by control strategy：Change the variable valve timing of variable valve system again, making can
The exhaust gas recycling for becoming auxiliary valve 12 is moved to the forced exhaust stage of instroke with the lifting curve duration, passes through auxiliary
Connecting tube 10 receives a part of exhaust gas as the exhaust gas of EGR for working cycles next time, realizes under middle-low load steady working condition
EGR rate change, while keep the original compression ratio of internal combustion engine, so as to improve the thermal efficiency, improve the emission performance of internal combustion engine；
And after the closing of main exhaust valve 9 (exhaust latter temperature pressure is not high, ensures that fuel oil will not spontaneous combustion), secondary injection is carried out,
The fuel oil of secondary injection is allowed to enter in auxiliary port 11 and air intake duct 4 with the exhaust gas of EGR and carries out good atomization, realizes similar point
Every formula combustion chambers burn；The duration of variable 12 lift of auxiliary valve of operating mode of height operating mode mutation is in instroke and air inlet row
It is moved between journey, needs transient response preferable, variable valve timing mechanism is durable, firm.
Compression ratio is to engine performance important, and compression ratio is higher, and the thermal efficiency is higher, and variable compression ratio is wished
Internal combustion engine possesses higher compression ratio during underload, so as to improve internal combustion engine thermal efficiency and fuel economy, is easy to startup of catching fire；
Internal combustion engine possesses relatively low compression ratio during big load, prevents engine knocks, protects internal combustion engine.And EGR can improve into
The temperature that temperature degree and compression end, while the not active constituent contained using itself controls burn rate to realize that low temperature fires
It burns, and secondary injection is realized during EGR, the atomization quality of this part fuel oil is improved using exhaust gas temperature, to internal combustion engine NOx
The discharge of pollutant has good abated effect to a certain extent.The present invention can realize the advantageous effect of more than technology, and
And it will not interfere with each other.
The operation principle of the present invention：
For the present invention under high load capacity steady working condition, the variable valve timing of variable valve system controls variable auxiliary valve 12
Opened at compression stroke initial stage, during engine compresses, piston stroking upward, in cylinder 2 gaseous mixture (consider residual waste gas quantity,
But most of is fresh air) auxiliary port 11 and assistant connecting pipe 10 are flowed by variable auxiliary valve 12, it is auxiliary by one
Help valve (variable auxiliary valve 12) after the duration variable auxiliary valve 12 close, gaseous mixture is stored in auxiliary port and air inlet
Between road, this part gaseous mixture sucks cylinder 2 again after working cycles start next time, reduces interior under high load capacity steady working condition
Combustion engine effective compression ratio, internal combustion engine in high load capacity low compression ratio, are realized variable effective compression ratio effect at this time, are reduced quick-fried
Shake tendency, protects internal combustion engine, when under middle-low load steady working condition, the changeable air valve timing controlled of variable valve system is variable auxiliary
Valve 12 is helped to be opened in the exhaust stroke forced exhaust stage, during engine exhaust, piston stroking upward, the exhaust gas in cylinder 2 leads to
It crosses variable auxiliary valve 12 and flows into auxiliary port 11 and assistant connecting pipe 10, working cycles start this rear portion gas again next time
Secondary sucking cylinder 2, realizes EGR and keeps high compression ratio, and the flow sensing 13 for being arranged on assistant connecting pipe monitors stream in real time
The exhaust gas flow of variable auxiliary valve 11 is crossed, by closed-loop control, the lift range variable adjusting of variable valve system is variable auxiliary
Valve 12 is helped to open the size of lift so as to control the exhaust gas flow for flowing through variable auxiliary valve 12, so as to accurately control EGR rate
Size, be equipped with fuel injector 14 in auxiliary port 11, fuel injector 14 can spray the similary fuel oil of former machine either ethyl alcohol or
Water or its mixture.In middle-low load steady working condition, in-cylinder direct-jet is carried out in cylinder 2 as usual, if fuel injector 14 is variable
Auxiliary valve 12 carries out oil spout after opening, this causes atomization of the fuel oil there are two engine strokes (induction stroke, compression stroke)
Diffusion time, and the hot waste gas for EGR Jing Guo variable auxiliary valve 12 can also improve the fuel oil of the injection of fuel injector 14
Atomization quality so as to improve internal combustion engine thermal efficiency, and reduces the discharge of PM, and the distributive value in auxiliary port 11 is former machine oil spout
The 0.3-0.7 of amount, corresponding Fuel Remained are supplied by in-cylinder direct-jet.In middle-low load steady working condition, cylinder is carried out in cylinder 2 as usual
Interior direct-injection, if fuel injector 14 carries out the mixture of spray ethyl alcohol or water or both after variable auxiliary valve 12 opening, this makes
Atomization diffusion time of these liquid there are two engine strokes (induction stroke, compression stroke) is obtained, and passes through variable auxiliary
The hot waste gas for EGR of valve 12 can also improve the atomization quality of the liquid of the injection of fuel injector 14, on the one hand these liquid can be
Ignition temperature in cylinder 2 can be reduced, reduces discharged nitrous oxides, on the other hand, these liquid can be pyrolyzed out promotion burn rate
Ion, improve combustion thermal efficiency.
The present invention can realize under high load capacity steady working condition that the variable valve timing of variable valve system controls variable auxiliary
Valve 12 is opened at compression initial stage, and (gaseous mixture of the cylinder 2 at compression initial stage is considered residual waste gas quantity, but most of is fresh
Air) it is stored between air intake duct 4 and auxiliary port 11, it is used for working cycles next time, makes variable auxiliary valve 12
The variable compression ratio lifting curve duration is moved to suction stroke and ends and compression travel initial stage, and by redesigning camshaft
Cam profile makes the lift of variable auxiliary valve 12 and duration all change (reduction), and air intake duct 4 is indirectly with auxiliary port 11
By a part of gaseous mixture, so as to change the effective compression ratio of internal combustion engine, internal combustion engine is made to possess relatively low effective compression ratio, prevented interior
Pinking occurs for combustion engine, protects internal combustion engine；Under middle-low load steady working condition, the variable valve timing control of variable valve system can
Become auxiliary valve 12 to realize the change of EGR rate and keep original high compression ratio, and EGR can control burn rate, and reduce
To realize low-temperature burning, reaching reduces NO for oxygen concentration and maximum combustion temperature in cylinderxThe effect of discharge；And the process that EGR is realized
Middle realization secondary injection, fuel oil enter air intake duct 4 by supplementary structure with exhaust gas, ensure fuel atomization effect；In keeping simultaneously
The original compression ratio of combustion engine so as to improve the thermal efficiency, improves the emission performance of internal combustion engine.
The internal-combustion engine variable compression ratio system of the present invention can be used for HCCI internal-combustion engine systems, can expand to Multi-Cylinder Diesel Engine, and remove
Certain substitute fuels can be used outside diesel fuel.
Claims (8)
1. a kind of internal-combustion engine variable compression ratio system, which is characterized in that including assistant connecting pipe (10), auxiliary port (11) and can
Become auxiliary valve (12)；
Auxiliary port (11) is arranged in the cylinder head (1) being connected with cylinder (2), and auxiliary port (11) passes through assistant connecting pipe
(10) it is connected with air intake branch (3), variable auxiliary valve (12) is assemblied in auxiliary port (11), and variable auxiliary valve (12) is most
High-lift corresponds respectively to 0.3~0.5 times of inlet valve maximum lift and longest duration, variable auxiliary gas with the longest duration
Door (12) is driven by variable valve system, and variable valve system is connect with ECU；
Wherein, under high load capacity steady working condition, ECU energy output orders are to variable valve system, the variable gas of variable valve system
The door variable auxiliary valve of timing control (12) is opened at compression initial stage.
2. internal-combustion engine variable compression ratio system according to claim 1, which is characterized in that in middle-low load steady working condition
Under, ECU energy output orders control variable auxiliary valve (12) to variable valve system, the variable valve timing of variable valve system
It is opened in the forced exhaust stage.
3. internal-combustion engine variable compression ratio system according to claim 1, which is characterized in that assistant connecting pipe (10) be with
The reducing pipe of volume, wherein, the necking end of assistant connecting pipe (10) is connect with air intake branch (3), and assistant connecting pipe (10) is separate
One end of necking end is connect with auxiliary port (11).
4. internal-combustion engine variable compression ratio system according to claim 1, which is characterized in that assistant connecting pipe (10) is equipped with
Flow sensor (13), flow sensor (13) flow through the gas flow of auxiliary port (11), flow sensor for measuring
(13) it is connect with ECU, wherein, the flow signal of flow sensor (13) is the input for the closed-loop control system being arranged in ECU
Signal.
5. internal-combustion engine variable compression ratio system according to claim 1, which is characterized in that inlet valve includes being respectively assembled at
Inlet valve one (5) and inlet valve two (6) in air intake duct (4), inlet valve one (5) and inlet valve two (6) by camshaft actuated,
Wherein, ECU energy output orders control variable auxiliary valve to variable valve system, the variable valve timing of variable valve system
(12) it is opened at air inlet initial stage.
6. the internal-combustion engine variable compression ratio system according to any one in Claims 1 to 5, which is characterized in that auxiliary gas
Fuel injector (14) is equipped in road (11), injector (14) is connect with oil supply system, and oil supply system is connect with ECU control units,
Wherein, fuel injector (13) is single fuel or double fuel fuel injector and sprays liquid before air inlet initial stage.
7. internal-combustion engine variable compression ratio system according to claim 6, which is characterized in that the liquid for fuel oil, water or
The one or more of ethyl alcohol.
8. a kind of internal combustion engine, which is characterized in that including the internal-combustion engine variable compression ratio described in any one in claim 1~7
System.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111022209A (en) * | 2019-12-31 | 2020-04-17 | 天津轩云科技有限公司 | Two-stroke direct-flow scavenging engine |
| CN112145307A (en) * | 2020-09-03 | 2020-12-29 | 东风柳州汽车有限公司 | Variable compression ratio internal combustion engine and automobile thereof |
| CN114962018A (en) * | 2022-06-11 | 2022-08-30 | 重庆潍柴发动机有限公司 | Air intake and exhaust control method for four-stroke engine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664342A (en) * | 2005-03-18 | 2005-09-07 | 上海绍博车辆动力装置科技有限公司 | Engine electric control EGR system for vehicle |
| CN104005860A (en) * | 2013-02-22 | 2014-08-27 | 现代自动车株式会社 | Variable compression engine |
| CN207879473U (en) * | 2018-02-10 | 2018-09-18 | 长安大学 | A kind of internal-combustion engine variable compression ratio system and internal combustion engine |
-
2018
- 2018-02-10 CN CN201810138602.1A patent/CN108194207B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664342A (en) * | 2005-03-18 | 2005-09-07 | 上海绍博车辆动力装置科技有限公司 | Engine electric control EGR system for vehicle |
| CN104005860A (en) * | 2013-02-22 | 2014-08-27 | 现代自动车株式会社 | Variable compression engine |
| CN207879473U (en) * | 2018-02-10 | 2018-09-18 | 长安大学 | A kind of internal-combustion engine variable compression ratio system and internal combustion engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111022209A (en) * | 2019-12-31 | 2020-04-17 | 天津轩云科技有限公司 | Two-stroke direct-flow scavenging engine |
| CN112145307A (en) * | 2020-09-03 | 2020-12-29 | 东风柳州汽车有限公司 | Variable compression ratio internal combustion engine and automobile thereof |
| CN114962018A (en) * | 2022-06-11 | 2022-08-30 | 重庆潍柴发动机有限公司 | Air intake and exhaust control method for four-stroke engine |
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| CN108194207B (en) | 2024-03-19 |
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