CN105781757B - CNG engine single cylinder is from inflation system and its from inflation method - Google Patents
CNG engine single cylinder is from inflation system and its from inflation method Download PDFInfo
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- CN105781757B CN105781757B CN201610128584.XA CN201610128584A CN105781757B CN 105781757 B CN105781757 B CN 105781757B CN 201610128584 A CN201610128584 A CN 201610128584A CN 105781757 B CN105781757 B CN 105781757B
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- pressurized tanks
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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
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
- F02D17/023—Cutting-out the inactive cylinders acting as compressor other than for pumping air into the exhaust system
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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
- F02B75/00—Other engines
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a kind of CNG engine single cylinders from inflation method, by using the in-engine cylinder of CNG as inflation cylinder, some or all of remainder cylinder makes to inflate cylinder as piston type compressor cylinder, is filled in high pressure CNG storage tank after civil natural gas is compressed as actuating cylinder.The present invention discloses a kind of CNG engine single cylinders from inflation system, including CNG engine, high pressure CNG storage tank and connection pipe network；The CNG engine includes cylinder and ECU, and the cylinder includes cylinder intake valve, cylinder exhaust valve, cylinder head and spark plug；The cylinder includes an inflation cylinder and at least one actuating cylinder；The inflation cylinder, which is provided with, closes cylinder assembly and filling channel, and gas tube is provided on the filling channel, cylinder charge control valve is provided on the gas tube.This method and device are able to use civil natural gas and are inflated to CNG automobile, and repacking amplitude is small, it is easy to accomplish, the performance of CNG engine is not influenced.
Description
Technical field
The present invention relates to a kind of CNG automobile, a kind of CNG engine single cylinder is particularly related to from inflation system and its from inflation side
Method.
Background technique
Natural gas is listed as three big pillars of world energy sources with coal, petroleum as generally acknowledged clean energy resource.Due to petroleum
The increasingly reduction of resource, in order to alleviate automobile to the worry of petroleum resources permanence and accordance with tolerance, gasoline and electric power, gasoline and day
The hybrid vehicles such as right gas are researched and developed in succession and have been come into operation.In recent years, country has put into effect some policy support days successively
The automobile and ship using LNG, CNG as fuel are encouraged and are supported in right gas industry development.
The natural gas resource in China is concentrated mainly on western and greater coasting area, on the one hand, ring gas source neighboring towns for example:
The ground such as Sichuan, Chongqing, Urumchi, Hainan, due to natural gas abundance, the gas station quantity built up is more, and natural gas vehicle is protected
The amount of having is also bigger.On the other hand, the gas source in natural gas resource scarcity city relies primarily on the natural gases such as transfering natural gas from the west to the east
Transmission pipeline network, the natural gas of conveying burns for resident uses in the majority, natural gas filling station few so as to cause city gas gas source
Quantity be difficult to break through, natural gas vehicle also therefore can not largely popularize.
Compared with natural gas filling station, civil natural gas will generally much.If can be using civil natural gas to CNG vapour
Vehicle carries out aerating, will effectively solve the problems, such as that current natural gas filling station quantity is few, CNG automobile aerating is difficult.Due to civilian natural
Gas pressure of registering one's residence is lower, usually in gauge pressure 26mbar (being converted into absolute pressure is 0.1036MPa) left and right；And the inflation pressure of CNG automobile
Power is about 18MPa, is registered one's residence pressure much higher than civil natural gas, it is therefore necessary to be carried out after compression pressurization just to civilian low pressure natural gas
It is possible that being filled in high pressure CNG storage tank.For CNG automobile car owner, the natural gas compressor of purchasing expensive be clearly without
Ji, and it is inconvenient for use, and there are security risks.In contrast, using automobile equipment of itself or mobile unit by civilian low pressure
Natural pressure be reduced to meet CNG automobile requirement obviously have more practical significance.
Currently, published CNG aerator is substantially all applied to gas station, not for automobile individual.Such as disclosure
Number a kind of high energy CNG aerator is disclosed for the Chinese invention patent of CN104776432A, utilizes pressure limiting valve and air inlet main valve
Pressure limiting and control are carried out to the CNG of input, fill natural gas while synergist injected by synergist filler, from
And mix natural gas with synergist, improve ignition temperature.And in relation to being focused mostly on using the research of civil natural gas in boiler etc.
Burner.If the Chinese patent application of Publication No. CN102679145A discloses a kind of combustion natural gas boiler and its burner,
It is able to use existing civil natural gas pipe network to be supplied, no longer needs to individually be laid with natural gas line and builds voltage regulating station, significantly
Reduce the use cost of combustion natural gas boiler.The research for directly carrying out aerating using civil natural gas in relation to CNG automobile is current
Or blank.
On the other hand, cylinder technology is closed as an energy-conserving and emission-cutting technology, is had in automobile fuel engine relatively broad
Application, its essence is making partial cylinders be in idling conditions valve acting "off", oil supply system stops to correspondence cylinder body
Oil spout, to reduce engine displacement.Masses, Honda, Chrysler are the Typical Representatives of this technology.Public
EA211 engine closes cylinder system, is to be displaced by solenoid valve control camshaft skewed slot, switches the cam of two different angles
To realize for the change under different operating conditions to valve stroke and timing, closes cylinder system and only need for high angle cam to be replaced with
There is no the cam of lift can be realized and closes cylinder；Cylinder system, core are closed used by the i-VTEC/VCM six cylinder engine of Honda
It is the disconnection or combination that the valve rocker of link is driven by the oil gear of a set of stick harness structure, the oil in connecting rod rocker arm
Pressure device drives the fulcrum of rocker arm, so that it is stopped driving valve, is also achieved that and closes cylinder；The HEMI engine of Chrysler
MDS closes cylinder system, and near camshaft or there are spring stick harness in the structure of a similar valve top bucket, this top bucket the inside, lead to
It crosses hydraulic-driven connection or disconnects, to realize change cylinder.
Summary of the invention
The purpose of the present invention is to provide a kind of CNG engine single cylinders that civil natural gas is directly filled with to CNG automobile certainly
Inflation system and its from inflation method.
To achieve the above object, it is used to for the low pressure natural gas from civil natural gas gas source being filled with designed by the present invention
CNG engine single cylinder in high pressure CNG storage tank includes the following steps: from inflation method
1) using in-engine the cylinder of CNG as inflation cylinder, it is at cylinder state of closing by closing cylinder assembly, and
Make the spark plug non-functional for inflating cylinder by ECU.
2) it will be used as actuating cylinder some or all of in cylinder remaining in CNG engine, the actuating cylinder is normally transported
Turn, inflating air cylinder is driven by the power that burning natural gas provides；In general, when being inflated, except inflation cylinder in CNG engine
Power all is provided to obtain maximum compression capability for compressed natural gas outside；But in some cases, for example, excess drive force or for
Fuel-efficient consideration can also make certain cylinders be in conventional and close cylinder state, neither output power, also not compressed natural gas.
3) the inflation cylinder under the action of actuating cylinder as piston type compressor cylinder, from it at the top of inflation it is logical
Road sucks the low pressure natural gas from civil natural gas gas source, is filled in high pressure CNG storage tank after compression.
Preferably, in step 3), using pressurized tanks group as caching, civil natural gas is carried out at least by inflation cylinder
It is re-filled with after two second compressions in high pressure CNG storage tank.Repeatedly compression can gradually improve gas pressure, preferably meet high pressure CNG
Requirement of the storage tank to pressure.
It is inflated certainly invention also provides a kind of CNG engine single cylinder specially designed to realize preceding method and is
System, including CNG engine and high pressure CNG storage tank, the CNG engine include cylinder and ECU, the cylinder includes cylinder intake
Valve, cylinder exhaust valve, cylinder head and spark plug.
The cylinder includes an inflation cylinder and at least one is used to drive the actuating cylinder of inflation cylinder.It makes an uproar to reduce
Sound and vibration, the quantity of actuating cylinder are preferably 2 or more.The inflation cylinder includes two kinds of operating modes, i.e. burning day
Right dynamic mode of the air lift for power and the modes of inflation as piston type compressor cylinder, modes of inflation is for compressing civilian day
Right gas is inflated, and dynamic mode is used to provide power when normally travel, both of which can under ECU control free switching.This
Outside, as previously mentioned, allowing certain cylinders to be in conventional closes cylinder state, neither output power, also not compressed natural gas.
The cylinder that closes that the inflation cylinder is provided with for keeping its cylinder intake valve, cylinder exhaust valve to be in closed state fills
It sets.Filling channel is provided in the cylinder head of the inflation cylinder.
The system further includes connection pipe network, and the connection pipe network includes gas tube, civil natural gas air inlet pipe and CNG storage tank
Input pipe.The gas tube is connected with filling channel, the civil natural gas gas source outside the civil natural gas air inlet pipe and system
It is connected, the CNG storage tank input pipe is connected with the gas transmission interface of high pressure CNG storage tank.Cylinder charge is provided on the gas tube
Control valve is provided with civil natural gas air intake control valve in the civil natural gas air inlet pipe, sets on the CNG storage tank input pipe
It is equipped with CNG storage tank air intake control valve.The pipeline connection that the specific structure of connection pipe network can refer to piston compressor is designed.
It is described to close cylinder assembly, spark plug, cylinder charge control valve, civil natural gas air intake control valve, CNG storage tank air inlet control
Valve processed is respectively connected in ECU, is controlled by ECU gas replenishment process.
Preferably, which further includes pressurized tanks group, and the pressurized tanks group includes at least one pressurized tanks；It is described
Connection pipe network further includes pressurized tanks input pipe and pressurized tanks efferent duct, and the pressurized tanks input pipe and pressurized tanks export
Pipe is connected on the gas transmission interface of pressurized tanks；Pressurized tanks input control is provided on the pressurized tanks input pipe
Valve is provided with pressurized tanks output control valve on the pressurized tanks efferent duct；The pressurized tanks input control valve, pressurization storage
Tank output control valve is respectively connected in ECU, is controlled by ECU gas replenishment process.It is further preferred that the pressurized tanks
The pressurized tanks quantity of group is 2~3, not only can get the natural gas of elevated pressures, but also is unlikely to occupy the sky in excessive automobile
Between.When using a pressurized tanks, the low pressure natural gas from civil natural gas gas source first is pressed through after inflating cylinder compression
In the pressurized tanks keep in, the pressurized tanks be filled with and (refer to that the pressure of storage tank reaches maximum value) afterwards as gas source to inflation cylinder into
Row gas supply, then be filled with after second compression in high pressure CNG storage tank.When using two or more pressurized tanks, civil natural gas gas is come from
The low pressure natural gas in source first is pressed through in level-one pressurized tanks after inflating cylinder compression and keeps in, and level-one pressurized tanks, which are filled with, (to be referred to
The pressure of storage tank reaches maximum value) afterwards as gas source to inflation cylinder gas supply, then the pressure obtained after second compression is higher natural
Gas is filled in two-stage supercharging storage tank, and so on the civil natural gas in upper level pressurized tanks is successively transferred to next stage
In pressurized tanks, improve the pressure of civil natural gas step by step, the civil natural gas in afterbody pressurized tanks is after compression
It is filled in high pressure CNG storage tank.Pressure maximum value (or maximum pressure) and minimum value (or minimum pressure) in the present invention are compression
The attainable maximum pressure of pressurized tanks institute and minimum pressure are corresponded in the process, and value is held according to cylinder compression ratio, pressurized tanks
Long-pending and bleed pressure difference and it is different, can be determined by testing, or (such as institute hereinafter is calculated referring to compound compressor
It states).
Preferably, the connection pipe network further includes inlet manifold and exhaust main, each on the inlet manifold, exhaust main
From breather check valve and exhaust check valve is provided with, the inlet manifold and exhaust main are connected on gas tube.It is described
CNG storage tank input pipe is connected on exhaust main, and the civil natural gas air inlet pipe is connected on inlet manifold.For including increasing
The system for pressing tank battery, the pressurized tanks input pipe is connected on exhaust main, the pressurized tanks efferent duct be connected into
On gas general pipeline.
Preferably, cooler is provided on the pressurized tanks input pipe and/or CNG storage tank input pipe.Increase cooler
The heat that natural gas generates in compression process can be removed, prevent tank body from overheating.
Preferably, pressure sensor is provided in the pressurized tanks input pipe and/or pressurized tanks；The CNG storage tank
Pressure sensor is provided in input pipe and/or high pressure CNG storage tank；In the pressure sensor access ECU.
Preferably, the inflation cylinder is the cylinder that intermediate firing order is in CNG engine, is started with reducing inflation
When influence to cylinder start-up course.
Preferably, the cylinder assembly that closes includes camshaft, cam sleeve and setting there are two the solenoid valve of spool, described convex
Be provided with high angle cam and low angle cam in axle sleeve, the cam sleeve is circumferentially fixed relative to camshaft, it is axial not
Fixed, i.e., cam sleeve and high angle cam thereon, low angle cam can be relative to the axial displacements of camshaft, but cannot phase
Camshaft is circumferentially rotated；Spiral chute is provided on the outside of the cam sleeve, described spiral chute or so is two-part
The hand of spiral on the contrary, two spools of the solenoid valve can protrude under control of the ecu in the skewed slot of spiral chute corresponding part,
Make cam sleeve and the axis of high angle cam, low angle cam under the action of the camshaft of rotation relative to camshaft thereon
To being displaced.Inflate the cylinder intake valve of cylinder, be respectively arranged at cylinder exhaust valve it is above-mentioned close cylinder assembly, when low angle is convex
When wheel is moved to the plunger position of corresponding cylinder intake valve, cylinder exhaust valve, plunger can not be opened, cylinder is in closed state,
It realizes and closes cylinder；When high angle cam is moved to corresponding plunger position, plunger can be opened, above-mentioned two valve restores just
Often.Above structure uses for reference masses EA211 engine and closes cylinder structure, have the advantages that structure simply, effect stability.Institute of the present invention
The cylinder assembly that closes used is not limited to above scheme, existing can also close cylinder scheme using other.
The beneficial effects of the present invention are: 1) on the basis of existing fuel engines closes cylinder technology, creatively by cylinder
It is transformed into piston compressor, repacking amplitude is small, it is easy to accomplish；2) the CNG engine by transformation has dynamic mode and fills
Two kinds of operating modes of gas mode, inflation cylinder is switched to modes of inflation when inflation, and after inflation, inflation cylinder is controlled in ECU
Under can switch to dynamic mode immediately, do not influence the performance of CNG engine, CNG automobile can normally travel；3) CNG automobile user
Using civil natural gas self-inflating, the insufficient matter of great urgency of gas station can be effectively relieved, promote the extensive benefit of natural gas energy resource
With, have biggish social value, meet the development trend of the following energy-saving and emission-reduction.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the CNG engine single cylinder designed by the present invention from inflation system.
Fig. 2 is the structural schematic diagram that cylinder is inflated in Fig. 1.
Fig. 3 is the structural schematic diagram that cylinder assembly is closed in Fig. 2.
Wherein: civil natural gas gas source 1, civil natural gas air inlet pipe 11, civil natural gas air intake control valve 12, civilian day
Right gas breather check valve 13, high pressure CNG storage tank 2, CNG storage tank input pipe 21, CNG storage tank air intake control valve 22, pressurized tanks 3,
Pressurized tanks input pipe 31, pressurized tanks input control valve 32, pressurized tanks efferent duct 33, pressurized tanks output control valve 34,
Inflate cylinder 4, actuating cylinder 41, cylinder intake valve 42, cylinder exhaust valve 43, cylinder head 44, spark plug 45, connecting rod 46, piston
47, crankshaft 48, filling channel 5, cylinder charge control valve 52, close cylinder assembly 6, solenoid valve 61, camshaft 62, cam sleeve 63,
High angle cam 64, low angle cam 65, spiral chute 66, plunger 67, gas tube 7, inlet manifold 71, breather check valve 72,
Exhaust main 73, exhaust check valve 74, cooler 8, pressure sensor 81
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
As shown in Fig. 1~2, CNG engine single cylinder designed by the present invention is from inflation system, including CNG engine, high pressure
CNG storage tank 2, pressurized tanks group and connection pipe network, CNG engine includes cylinder and ECU.The CNG engine is that six cylinders start
Machine, one of cylinder are adapted as inflation cylinder 4, and in addition five cylinders are remained unchanged as actuating cylinder 41.
Be respectively arranged on each cylinder cylinder intake valve 42, cylinder exhaust valve 43, cylinder head 44, spark plug 45, connecting rod 46,
Piston 47 and crankshaft 48.It inflates and is provided with filling channel 5 in the cylinder head 44 of cylinder 4, the cam for inflating cylinder 4 is nearby provided with
Close cylinder assembly 6.
Closing cylinder assembly 6 includes that there are two the solenoid valve 61 of spool, cam sleeves 63 for camshaft 62, cam sleeve 63 and setting
On be provided with high angle cam 64 and low angle cam 65, cam sleeve 63 is not circumferentially fixed relative to camshaft 62, axial solid
It is fixed；The outside of cam sleeve 63 is provided with spiral chute 66, and the two-part hand of spiral of spiral chute 66 or so is on the contrary, solenoid valve
61 two spools can protrude under control of the ecu in the skewed slot of 66 corresponding part of spiral chute, make cam sleeve 63 and thereon
Axial direction under the action of camshaft 62 of rotation relative to camshaft 62 of high angle cam 64, low angle cam 65 moved
It is dynamic.When at the plunger 67 that low angle cam 65 is moved to cylinder intake valve 42, cylinder exhaust valve 43, plunger 67 can not be opened,
The inflation cylinder 4 is in closed state, that is, realizes and close cylinder；It, can be with when high angle cam 64 is moved at corresponding plunger 67
Plunger 67 is opened, above-mentioned two valve restores normal.
Inflating cylinder 4 includes two kinds of operating modes, i.e., burning natural gas provides the dynamic mode of power and as piston type
The modes of inflation of compresser cylinder.Under dynamic mode, cylinder charge control valve 52 is closed, and spark plug 45 works normally, and closes cylinder dress
Setting 6 makes the cam return for inflating cylinder 4；Under modes of inflation, cylinder charge control valve 52 is opened, and spark plug 45 fails, and closes cylinder dress
It sets 6 to carry out closing cylinder operation, inflates cylinder 4 at this time and there was only 5 one blow vents of filling channel, actuating cylinder 41 passes through crankshaft 48, connects
The piston 47 of the driving inflation cylinder 4 of bar 46 pumps, and inflates cylinder 4 at this time and is equivalent to piston type compressor cylinder.
Pressurized tanks group includes two pressurized tanks 3, is referred to as pressurized tanks A, pressurized tanks B.
Connecting pipe network includes gas tube 7, inlet manifold 71, exhaust main 73, civil natural gas air inlet pipe 11, CNG storage tank
Input pipe 21, pressurized tanks input pipe 31 and pressurized tanks efferent duct 33.
7 one end of gas tube is connected with filling channel 5, and the other end is connected with inlet manifold 71 and exhaust main 73, gas tube 7
On be provided with cylinder charge control valve 52.Breather check valve 72 and exhaust are each provided on inlet manifold 71, exhaust main 73
Check valve 74.CNG storage tank input pipe 21, pressurized tanks input pipe 31 are connected on exhaust main 73, pressurized tanks efferent duct 33,
Civil natural gas air inlet pipe 11 is connected on inlet manifold 71.
Civil natural gas air inlet pipe 11 is connected with the civil natural gas gas source 1 outside system, in civil natural gas air inlet pipe 11
It is provided with civil natural gas air intake control valve 12 and civil natural gas breather check valve 13.
CNG storage tank input pipe 21 is connected with the gas transmission interface of high pressure CNG storage tank 2, is provided on CNG storage tank input pipe 21
CNG storage tank air intake control valve 22,
Pressurized tanks input pipe 31 and pressurized tanks efferent duct 33 are connected on the gas transmission interface of pressurized tanks 3.Increase
It is provided with pressurized tanks input control valve 32 on pressure storage tank input pipe 31, it is defeated to be provided with pressurized tanks on pressurized tanks efferent duct 33
Control valve 34 out.
Cooler 8 is respectively arranged on pressurized tanks input pipe 31 and CNG storage tank input pipe 21.Pressurized tanks input pipe
31, pressurized tanks 3, CNG storage tank input pipe 21, be respectively arranged with pressure sensor 81 on high pressure CNG storage tank 2.
Close cylinder assembly 6, spark plug 45, cylinder charge control valve 52, civil natural gas air intake control valve 12, CNG storage tank into
Gas control valve 22, pressurized tanks input control valve 32, pressurized tanks output control valve 34, pressure sensor 81 are respectively connected to ECU
In, gas replenishment process is controlled by ECU.
Above-mentioned CNG engine single cylinder can drive inflation cylinder 4 by actuating cylinder 41 under ECU control from inflation system
Make it as piston type compressor cylinder, the low pressure natural gas from civil natural gas gas source 1 is sucked from filling channel 5, through pressing
It is filled with after contracting in high pressure CNG storage tank 2.Specific step is as follows:
1) cylinder charge control valve 52, spark plug 45 are controlled by ECU and closes cylinder assembly 6, make to inflate cylinder 4 in inflation
Mode, actuating cylinder 41 operate normally and drive by crankshaft 48 connecting rod 46 of inflation cylinder 4, transport its piston 47 up and down reciprocatingly
It is dynamic.
2) the pressurized tanks output control valve 34 and pressurized tanks input control valve 32 for closing pressurized tanks A, B, close CNG
Storage tank air intake control valve 22 opens the pressurized tanks input control valve 32 of civil natural gas air intake control valve 12, pressurized tanks A.
3) inflation cylinder 4 sucks low by the movement of its piston 47 as piston compressor from civil natural gas gas source 1
Pressure natural gas simultaneously carries out first time compression, is pressed into pressurized tanks A by the civil natural gas of first compression；Repeat the step
Until pressurized tanks A is filled with, i.e. the pressure of pressurized tanks A reaches maximum value.
4) civil natural gas air intake control valve 12 is closed, the pressurized tanks input control valve 32 of pressurized tanks A is closed, is opened
The pressurized tanks output control valve 34 of pressurized tanks A opens the pressurized tanks input control valve 32 of pressurized tanks B, to be pressurized storage
Tank A is supplied as gas source to inflation cylinder 4, is filled in pressurized tanks B after the second second compression, Repeated Compression is until pressurized tanks
Natural gas is substantially all in A is transferred in pressurized tanks B (i.e. pressurized tanks A pressure is down to minimum value).
5) pressurized tanks B is filled with, i.e. after the pressure of pressurized tanks B reaches maximum value, closes the pressurized tanks of pressurized tanks B
Input control valve 32 opens the pressurized tanks output control valve 34 of pressurized tanks B, opens CNG storage tank air intake control valve 22, to increase
Press storage tank B as gas source to inflation cylinder 4 supply, be filled with after third second compression in high pressure CNG storage tank 2, Repeated Compression up to
Natural gas is substantially all in pressurized tanks B is transferred in high pressure CNG storage tank 2 (i.e. pressurized tanks B pressure is down to minimum value).
6) it repeats the above steps, until the pressure of high pressure CNG storage tank 2 reaches required value.After inflation, aforementioned institute is closed
There is control valve, inflation cylinder 4 is switched back into dynamic mode.
The estimation of pressurized tanks maximum pressure and minimum pressure
CNG engine compresses are higher, generally 10.1--11.3.The goal pressure of the quasi- compression of the present embodiment is 18MPa
Final pressure, the meter pressure of civil natural gas is 2.3kpa, then (0.101 is atmospheric pressure), the total pressure ratio ε of compressort
=18/ (0.101+2.3/1000)=174.
A. the estimation of maximum pressure
The series, parallel provided in embodiment and mixed connection include two pressurized tanks and a high pressure CNG storage tank, and day
Right gas is all that successively have passed through three second compressions, therefore compressor series Z=3.
The pressure ratio of every grade of compression can be calculated
Discharge pressure after first order compression, the i.e. maximum pressure of pressurized tanks A are 5.6 × 0.103=
0.577MPa；
Discharge pressure after the compression of the second level, the i.e. maximum pressure of pressurized tanks B are 0.577 × 5.6=
3.23MPa；
Discharge pressure after third level compression, i.e. high pressure the CNG storage tank attainable maximum of institute after the system compresses
Pressure is 3.23 × 5.6=18.1MPa.
B. the estimation of minimum pressure
If pressure value is p1 in intermediate gas tank, gas tank volume is v1, quality m1；If in compression cylinder inside clearance volume
Gaseous mass is m2, pressure p2, volume v2；If the total volume of cylinder is v.When the gas in intermediate gas tank just can not be by
When cylinder sucks, when gas expansion arrives lower dead center in the volume of cylinder inside clearance at this time, cylinder pressure and centre pressure inside the tank
It is equal.Do not consider expansion work, does not consider temperature change, relationship when pressure reaches balance when both sides are as follows: p2·v2=m2·
RT (before expansion)；p1V=m2RT (after expansion).Residual gas pressure at this time are as follows: p1=(p2·v2)/v.The pressure
Power is the minimum pressure of pressurized tanks.
Claims (8)
1. a kind of CNG engine single cylinder is from inflation method, for the low pressure natural gas from civil natural gas gas source (1) to be filled with
In high pressure CNG storage tank (2), which comprises the steps of:
1) it using the in-engine cylinder of CNG as inflation cylinder (4), is at by closing cylinder assembly (6) and closes cylinder state,
And the spark plug (45) for inflating cylinder (4) is set to fail by ECU；
2) actuating cylinder (41) will be used as some or all of in cylinder remaining in CNG engine, the actuating cylinder (41) is just
Often operating drives inflating air cylinder (4) by the power that burning natural gas provides；
3) the inflation cylinder (4) under the action of actuating cylinder (41) as piston type compressor cylinder, from it at the top of fill
The low pressure natural gas that gas channel (5) sucking comes from civil natural gas gas source (1) passes through inflation using pressurized tanks group as caching
Cylinder (4) be re-filled in high pressure CNG storage tank (2) after compressing at least twice to civil natural gas.
2. it is a kind of for realize method described in claim 1 and the CNG engine single cylinder that specially designs from inflation system, including
CNG engine and high pressure CNG storage tank (2), the CNG engine include cylinder and ECU, and the cylinder includes cylinder intake valve
(42), cylinder exhaust valve (43), cylinder head (44) and spark plug (45), it is characterised in that:
The cylinder includes inflation cylinder (4) and at least one actuating cylinder (41) for driving the inflation cylinder (4)；
Inflation cylinder (4) is provided with for keeping its cylinder intake valve (42), cylinder exhaust valve (43) to be in closing for closed state
Cylinder assembly (6)；Filling channel (5) are provided in the cylinder head (44) of inflation cylinder (4)；
The system further includes connection pipe network, and the connection pipe network includes gas tube (7), civil natural gas air inlet pipe (11) and CNG
Storage tank input pipe (21)；The gas tube (7) is connected with filling channel (5), the civil natural gas air inlet pipe (11) and system
Outer civil natural gas gas source (1) is connected, the gas transmission interface phase of the CNG storage tank input pipe (21) and high pressure CNG storage tank (2)
Even；It is provided with cylinder charge control valve (52) on the gas tube (7), is provided with the people on the civil natural gas air inlet pipe (11)
With natural gas air intake control valve (12), CNG storage tank air intake control valve (22) are provided on the CNG storage tank input pipe (21)；
It is described close cylinder assembly (6), spark plug (45), cylinder charge control valve (52), civil natural gas air intake control valve (12),
CNG storage tank air intake control valve (22) is respectively connected in ECU, is controlled by ECU gas replenishment process；
The system further includes pressurized tanks group, and the pressurized tanks group includes at least one pressurized tanks (3)；The connection pipe network
It further include pressurized tanks input pipe (31) and pressurized tanks efferent duct (33), the pressurized tanks input pipe (31) and pressurized tanks
Efferent duct (33) is connected on the gas transmission interface of pressurized tanks (3)；Increasing is provided on the pressurized tanks input pipe (31)
It presses storage tank input control valve (32), is provided with pressurized tanks output control valve (34) on the pressurized tanks efferent duct (33)；Institute
State pressurized tanks input control valve (32), pressurized tanks output control valve (34) is respectively connected in ECU, by ECU to inflating
Cheng Jinhang control.
3. CNG engine single cylinder according to claim 2 is from inflation system, it is characterised in that: the connection pipe network also wraps
Inlet manifold (71) and exhaust main (73) are included, the inlet manifold (71), exhaust main are each provided with air inlet list on (73)
To valve (72) and exhaust check valve (74), the inlet manifold (71) and exhaust main (73) are connected on gas tube (7),
The CNG storage tank input pipe (21), pressurized tanks input pipe (31) are connected on exhaust main (73), the pressurized tanks output
Pipe (33), civil natural gas air inlet pipe (11) are connected on inlet manifold (71).
4. CNG engine single cylinder according to claim 2 or 3 is from inflation system, it is characterised in that: described to close cylinder assembly
It (6) include that there are two the solenoid valves (61) of spool for camshaft (62), cam sleeve (63) and setting, on the cam sleeve (63)
It is provided with high angle cam (64) and low angle cam (65), the cam sleeve (63) is circumferentially solid relative to camshaft (62)
It is fixed, axial to be not fixed；It is provided with spiral chute (66) on the outside of the cam sleeve (63), spiral chute (66) left and right two
The partial hand of spiral on the contrary, two spools of the solenoid valve (61) can to protrude into spiral chute (66) under control of the ecu right
It answers in the skewed slot of part, makes cam sleeve (63) and high angle cam (64) thereon, low angle cam (65) in the convex of rotation
Axial displacement under the action of wheel shaft (62) relative to camshaft (62).
5. CNG engine single cylinder according to claim 3 is from inflation system, it is characterised in that: the pressurized tanks input
Cooler (8) are provided on pipe (31) and/or CNG storage tank input pipe (21).
6. CNG engine single cylinder according to claim 3 is from inflation system, it is characterised in that: the pressurized tanks input
Pressure sensor (81) are provided in pipe (31) and/or pressurized tanks (3)；The CNG storage tank input pipe (21) and/or high pressure
Pressure sensor (81) are provided in CNG storage tank (2)；In pressure sensor (81) the access ECU.
7. CNG engine single cylinder according to claim 2 or 3 is from inflation system, it is characterised in that: the pressurized tanks group
Pressurized tanks (3) quantity be 2~3.
8. CNG engine single cylinder according to claim 2 or 3 is from inflation system, it is characterised in that: the inflation cylinder
(4) cylinder to be in intermediate firing order in CNG engine.
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| US7353786B2 (en) * | 2006-01-07 | 2008-04-08 | Scuderi Group, Llc | Split-cycle air hybrid engine |
| CN101629493A (en) * | 2009-06-25 | 2010-01-20 | 大连理工大学 | Injection strategy of internal combustion-air mixed power device |
| CN201573536U (en) * | 2008-09-26 | 2010-09-08 | 福特环球技术公司 | Vehicle and system for assembling pickup truck |
| CN101832176A (en) * | 2009-03-09 | 2010-09-15 | 大连理工大学 | Engine |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7353786B2 (en) * | 2006-01-07 | 2008-04-08 | Scuderi Group, Llc | Split-cycle air hybrid engine |
| CN201573536U (en) * | 2008-09-26 | 2010-09-08 | 福特环球技术公司 | Vehicle and system for assembling pickup truck |
| CN101832176A (en) * | 2009-03-09 | 2010-09-15 | 大连理工大学 | Engine |
| CN101629493A (en) * | 2009-06-25 | 2010-01-20 | 大连理工大学 | Injection strategy of internal combustion-air mixed power device |
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