CN105715387B - CNG engine multi-cylinder is from inflation system and its from inflation method - Google Patents
CNG engine multi-cylinder is from inflation system and its from inflation method Download PDFInfo
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- CN105715387B CN105715387B CN201610127902.0A CN201610127902A CN105715387B CN 105715387 B CN105715387 B CN 105715387B CN 201610127902 A CN201610127902 A CN 201610127902A CN 105715387 B CN105715387 B CN 105715387B
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- cylinder
- inflation
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- natural gas
- 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
-
- 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
Abstract
The invention discloses a kind of CNG engine multi-cylinders from inflation method, using in-engine at least two cylinder of CNG as inflation cylinder, remaining cylinder is as actuating cylinder, it is run well by actuating cylinder and drives inflation cylinder, make it as piston type compressor cylinder, is filled with after being compressed to civil natural gas in high pressure CNG storage tank.The invention also discloses a kind of CNG engine multi-cylinders from inflation system, including CNG engine, high pressure CNG storage tank, pressurized tanks and connection pipe network, and CNG engine includes cylinder and ECU, and cylinder includes at least two inflation cylinders and several actuating cylinders；Inflation cylinder, which is provided with, closes cylinder assembly and filling channel；It is provided with pressure sensor on the pipeline being connected in high pressure CNG storage tank and pressurized tanks and/or with the two, cylinder assembly, spark plug, control valve, pressure sensor is closed and is respectively connected in ECU.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 multi-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 automotive vehicle 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 multi-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 multi-cylinder in high pressure CNG storage tank includes the following steps: from inflation method
1) it using in-engine at least two cylinder of CNG as inflation cylinder, is at by closing cylinder assembly and closes cylinder shape
State, and by ECU make inflate cylinder spark plug non-functional；
2) using cylinder remaining in CNG engine as actuating cylinder, the actuating cylinder runs well, natural by burning
The power that air lift supplies drives inflating air cylinder；
3) the inflation cylinder is led to as piston type compressor cylinder under the action of actuating cylinder with the inflation at the top of it
Road is finally filled in high pressure CNG storage tank after one or many compressions as natural gas access way sucking natural gas；
In above-mentioned steps, entire gas replenishment process is controlled by ECU.
Preferably, civil natural gas is repeatedly compressed as caching using pressurized tanks；In compression process, pressurization storage
Tank can not only be used for storage tank and store compressed natural gas, provide natural gas to inflation cylinder but also as gas source.Repeatedly compression can
Gas pressure is gradually improved, requirement of the high pressure CNG storage tank to pressure is preferably met.
Optionally, respectively inflation cylinder is using airing form in parallel, from the same gas source (including civil natural gas gas source and each
Pressurized tanks) sucking natural gas, natural gas is pressed into the same storage tank (different from the pressurized tanks or height of gas source after being compressed
Press CNG storage tank) in.When using a pressurized tanks, the low pressure natural gas from civil natural gas gas source, through inflating cylinder compression
After first be pressed through in the pressurized tanks and keep in, which, which reaches, carries out as gas source to inflation cylinder after its maximum value
Gas supply, then be filled with after second compression in high pressure CNG storage tank.When using two or more pressurized tanks, each pressurized tanks are suitable by inflating
Sequence is known as (similarly hereinafter) such as level-one pressurized tanks, two-stage supercharging storage tanks, the low pressure natural gas from civil natural gas gas source, through inflating
First be pressed through in level-one pressurized tanks and keep in after cylinder compression, level-one pressurized tanks pressure reach after its maximum value as gas source to
Cylinder gas supply, then the higher natural gas of pressure obtained after second compression are inflated, is filled in two-stage supercharging storage tank, and so on successively
Natural pressure in upper level pressurized tanks is contractd and is transferred in next stage pressurized tanks, mentions the pressure of natural gas step by step
Height, the natural gas in afterbody pressurized tanks are filled with after compression in high pressure CNG storage tank.Pressure maximum value in the present invention
(or maximum pressure) and minimum value (or minimum pressure) for corresponded in compression process the attainable maximum pressure of pressurized tanks and
Minimum pressure, value is different according to cylinder compression ratio, the difference of pressurized tanks volume and bleed pressure, can be carried out by experiment
It determines, or is calculated (as described later) referring to compound compressor.
Optionally, respectively inflation cylinder is using series connection airing form, and the low pressure natural gas from civil natural gas gas source is by the
One inflation cylinder sucking is pressed into high pressure CNG storage tank by the last one inflation cylinder successively after each inflation cylinder compression
It is interior.Further, to guarantee the gas pressure for entering next stage inflation cylinder, adjacent (referring to adjacent in series sequence) two is inflated
One pressurized tanks is set between cylinder as caching.
Optionally, respectively inflation cylinder uses mixed connection airing form, i.e., airing form and series connection airing form mutually group in parallel
The airing form of conjunction.Adoptable mode include but is not limited to inflated with third after two inflation cylinders in parallel cylinder connect,
Two inflation cylinders in parallel are connected etc. with other two inflation cylinders in parallel.
Preferably, include n inflation cylinder in the CNG engine, n >=3, wherein preceding n-1 inflation cylinder parallel connection from
Gas source (including civil natural gas gas source and each pressurized tanks) sucks natural gas, inflates in cylinder these after being compressed and sucks
Natural gas be input to n-th of inflation cylinder and (indicate to be different from preceding n-1, not absolute precedence for n-th.), n-th
By the storage tank (increasing thereafter of natural gas indentation next stage after n-1 inflation cylinder is compressed as gas source before inflation cylinder
Press storage tank or high pressure CNG storage tank) in.Under the airing form, preceding n-1 inflation cylinder necessarily is in identical suction stroke or row
Gas stroke (only there are two strokes when inflation cylinder charge), and n-th of inflation cylinder necessarily is in and preceding n-1 inflation cylinder phase
Anti- exhaust or suction stroke, i.e., preceding n-1 inflation cylinder differ a progressive error, preceding n-1 inflation with n-th of inflation cylinder
At the end of cylinder is in top dead centre exhaust, n-th of cylinder, which is exactly in lower dead center air-breathing, to be terminated.The airing form is as a kind of
Specific mixed connection airing form, its advantage is that, preceding n-1 inflation cylinder is simultaneously to n-th of inflation cylinder charge, n-th of inflation
No setting is required between cylinder and preceding n-1 inflation cylinder, and pressurized tanks are the pressure of certifiable n-th of inflation cylinder, therefore opposite
In serial or parallel connection, one pressurized tanks can be set less.
Preferably, respectively inflation cylinder sucks natural gas from civil natural gas gas source simultaneously, is filled with the first order after being compressed
Pressurized tanks；After first order pressurized tanks reach maximum pressure, a part inflation cylinder continues to fill into first order pressurized tanks
Gas, another part are inflated cylinder using first order pressurized tanks as gas source, are inflated into second level pressurized tanks；The rest may be inferred, on
After level-one pressurized tanks reach maximum pressure, partial inflation cylinder is inflated using it as gas source into next stage pressurized tanks, until
Afterbody pressurized tanks are filled in high pressure CNG storage tank after being compressed as gas source.Further, if in gas replenishment process because
Upper level inflation cylinder breaks down or compression causes gas pressure in some pressurized tanks to be reduced to the pressurized tanks more slowly
Minimum pressure when leading to be not enough to carry out next stage compression, can suspend next stage compression, will execute the gas of next stage compression duty
Cylinder temporarily functions as this grade compression, makes the pressurized tanks full of (i.e. pressure reaches maximum value) as early as possible.
It is inflated certainly invention also provides a kind of CNG engine multi-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 include cylinder into
Air valve, cylinder exhaust valve, cylinder head and spark plug；The cylinder includes inflating cylinder and the power gas for driving inflation cylinder
The quantity of cylinder, the inflation cylinder is no less than two；The inflation cylinder is provided with for keeping its cylinder intake valve, inblock cylinder
What air valve was in closed state closes cylinder assembly；Filling channel is provided in the cylinder head of the inflation cylinder；The system further includes
Pressurized tanks and connection pipe network, the connection pipe network is for connecting filling channel, civil natural gas gas source, pressurized tanks and high pressure
CNG storage tank, specific structure can refer to piston compressor and be designed；Check valve is provided on the pipeline of the connection pipe network
And control valve, pressure sensor, the pressurized tanks are provided in the high pressure CNG storage tank and/or on coupled pipeline
Pressure sensor is provided on upper and/or coupled pipeline；It is described to close cylinder assembly, spark plug, control valve, pressure sensor
It is respectively connected in ECU, entire gas replenishment process is controlled by ECU.
Preferably, respectively the connection type of inflation cylinder is in parallel, series connection or mixed connection, corresponds respectively to aforementioned inflation side in parallel
Formula, series connection airing form, mixed connection airing form.
Preferably, cooler is provided on the input channel of the pressurized tanks and/or high pressure CNG storage tank.Increase cooling
The heat that natural gas generates in compression process can be removed in device, prevents tank body from overheating.
Preferably, the pressurized tanks quantity of the pressurized tanks group is 2~3, both can get the natural gas of elevated pressures,
It is unlikely to occupy the space in excessive automobile again.
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.
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) multiple cylinders are used
It is inflated as inflation cylinder, aeration speed faster, is particularly suitable for the big large-scale CNG automobile of gas consumption, such as heavy truck, public transport
Deng；4) CNG user vehicle utilizes civil natural gas self-inflating, and the insufficient matter of great urgency of gas station can be effectively relieved, and promotes day
The extensive utilization of the right gas energy, has biggish social value, meets the development trend of the following energy-saving and emission-reduction.
Detailed description of the invention
Parallel-connection structure schematic diagram of the CNG engine multi-cylinder from inflation system in Fig. 1 embodiment.
Cascaded structure schematic diagram of the CNG engine multi-cylinder from inflation system in Fig. 2 embodiment.
Hybrid connected structure schematic diagram of the CNG engine multi-cylinder from inflation system in Fig. 3 embodiment.
Fig. 4 is the structural schematic diagram that cylinder is inflated in Fig. 1~3.
Fig. 5 is the structural schematic diagram that cylinder assembly is closed in Fig. 4.
Wherein: civil natural gas gas source 1, high pressure CNG storage tank 2, pressurized tanks 3, inflation cylinder 4, actuating cylinder 41, cylinder
Intake valve 42, cylinder head 44, spark plug 45, connecting rod 46, piston 47, crankshaft 48, filling channel 5, closes cylinder dress at cylinder exhaust valve 43
Set 6, solenoid valve 61, camshaft 62, cam sleeve 63, high angle cam 64, low angle cam 65, spiral chute 66, plunger
67, control valve 7, check valve 71, 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 figures 1-4, the CNG engine multi-cylinder designed by the present invention is from inflation system, including CNG engine, high pressure
CNG storage tank 2, pressurized tanks 3 and connection pipe network.CNG engine includes cylinder and ECU, and the cylinder includes cylinder intake valve
42, cylinder exhaust valve 43, cylinder head 44 and spark plug 45.The CNG engine be six cylinder engine, be referred to as cylinder I~
VI, cylinder II, IV, VI is adapted as inflation cylinder 4；Cylinder I, III, V is without repacking, as actuating cylinder 41.Inflate cylinder 4
It is provided with and closes cylinder assembly 6, inflate and be provided with filling channel 5 in the cylinder head 44 of cylinder 4.The quantity of pressurized tanks 3 is two, point
It is also known as pressurized tanks A, pressurized tanks B.
The connection pipe network is for connecting filling channel 5, civil natural gas gas source 1, pressurized tanks 3 and high pressure CNG storage tank
2.Check valve 71 and control valve 7 are provided on the pipeline of the connection pipe network.For convenience, each control valve 7 uses small English
Letter is numbered.Check valve 71 allow by direction be arrow direction in figure on pipeline.2 He of high pressure CNG storage tank
Pressure sensor 81 and cooler 8 are respectively arranged on the admission line of pressurized tanks 3.Close cylinder assembly 6, spark plug 45, control
Valve 7, pressure sensor 81 are respectively connected in ECU, are controlled by ECU entire gas replenishment process.
As shown in figure 5, close cylinder assembly 6 including camshaft 62, cam sleeve 63 and the solenoid valve 61 there are two spool is set,
High angle cam 64 and low angle cam 65 are provided on cam sleeve 63, cam sleeve 63 is circumferential solid relative to camshaft 62
It is fixed, axial to be not fixed；The outside of cam sleeve 63 is provided with spiral chute 66, the two-part hand of spiral of spiral chute 66 or so
On the contrary, two spools of solenoid valve 61 can protrude under control of the ecu in the skewed slot of 66 corresponding part of spiral chute, make camshaft
Set 63 and high angle cam 64 thereon, low angle cam 65 under the action of camshaft 62 of rotation relative to camshaft 62
Axially moved.It, can not when at the plunger 67 that low angle cam 65 is moved to cylinder intake valve 42, cylinder exhaust valve 43
Plunger 67 is opened, which is in closed state, that is, realizes and close cylinder；When high angle cam 64 is moved to corresponding plunger
When at 67, plunger 67 can be 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, under control of the ecu, control valve b, c, d are closed, keeps spark plug 45 normal
Work, closing cylinder assembly 6 makes the cam return for inflating cylinder 4；Under modes of inflation, under control of the ecu, control valve b, c, d are opened,
So that spark plug 45 is failed, closes cylinder assembly 6 and carry out closing cylinder operation, inflate cylinder 4 at this time and there was only 5 one blow vents of filling channel, move
Strength cylinder 41 is pumped by the piston 47 of crankshaft 48, the driving inflation cylinder 4 of connecting rod 46, and it is suitable to inflate cylinder 4 at this time
In piston type compressor cylinder.
Above-mentioned CNG engine multi-cylinder includes in parallel, series connection and three kinds of airing forms of mixed connection from inflation system, right individually below
It is illustrated.
As shown in Figure 1, respectively using being connected in parallel, each cylinder 4 of inflating can suck naturally inflation cylinder 4 from gas source
Gas is compressed, the specific steps are as follows:
1) each inflation cylinder 4 is switched to by modes of inflation by ECU, opens control valve b, c, d, actuating cylinder 41 is normal
It runs and drives inflation cylinder 4.
2) control valve a, f are opened, control valve e, g, h, i is kept to be in close state.
3) respectively inflation cylinder 4 sucks low pressure natural gas from civil natural gas gas source 1 respectively and carries out first time compression, passes through
The civil natural gas of first compression is pressed into pressurized tanks A.Suction pathway: a → b → II, a → c → IV, a → d → VI；Row
Gas circuit diameter: II → b → f → A, IV → c → f → A, VI → d → f → A.Wherein small English alphabet is control valve, capitalization English
Letter is pressurized tanks, and Roman number is cylinder, similarly hereinafter.After pressurized tanks A is filled with and (refers to that its pressure reaches maximum value), control is closed
Valve a, f processed.
4) control valve h, g are opened, is supplied to each inflation cylinder 4 using pressurized tanks A as gas source, is pressed for the second time simultaneously
It is filled with after contracting in pressurized tanks B.Suction pathway: A → h → b → II, A → h → c → IV, A → h → d → VI；Exhaust pathway: II
→ b → g → B, IV → c → g → B, VI → d → g → B.Repeated Compression is until the gas in pressurized tanks A can not be inflated gas
Cylinder sucking, i.e. inflation cylinder inside clearance volumetric gas be expanded to the pressure in cylinder after bottom dead center just with it is remaining in pressurized tanks A
Gas pressure is equal.The pressure of pressurized tanks A is its output gas minimum pressure at this time, stops gas output, return step 2)
To continuing to be inflated pressurized tanks B after being full of pressurized tanks A.
5) pressurized tanks B is filled with, i.e. after the pressure of pressurized tanks B reaches maximum value, closes control valve h, g, open i, e,
It supplies, is filled with after third second compression in high pressure CNG storage tank 2 using pressurized tanks B as gas source to inflation cylinder 4.Suction pathway:
B → i → b → II, B → i → c → IV, B → i → d → VI；Exhaust pathway: II → b → e → high pressure CNG storage tank, IV → c → e
→ high pressure CNG storage tank, VI → d → e → high pressure CNG storage tank.Repeated Compression is until the gas in pressurized tanks B can not be inflated gas
Cylinder sucking, i.e. inflation cylinder inside clearance volumetric gas be expanded to the pressure in cylinder after bottom dead center just with it is remaining in pressurized tanks B
Gas pressure is equal, and the pressure of pressurized tanks B is its output gas minimum pressure at this time, stops gas output.
6) it repeats the above steps, until the pressure of high pressure CNG storage tank 2 reaches setting value, which determines according to demand.Inflation
After, aforementioned all control valves are closed, inflation cylinder 4 is switched back into dynamic mode.
As shown in Fig. 2, respectively inflation cylinder 4 is using being connected in series, the natural gas from civil natural gas gas source 1 is from cylinder
II sucking, is successively compressed through cylinder II, IV, VI, the specific steps are as follows:
1) each inflation cylinder 4 is switched to by modes of inflation by ECU, opens control valve b, c, d, each actuating cylinder 41 is just
It often runs and drives inflation cylinder 4.
2) control valve a, f are opened, cylinder II sucks low pressure natural gas from civil natural gas gas source 1 and carries out first time pressure
Contracting is pressed into pressurized tanks A by the civil natural gas that cylinder II compresses.Suction pathway: a → b → II；Exhaust pathway: II
→b→f→A。
4) control valve a, f are closed, control valve h, g are opened, is supplied using pressurized tanks A as gas source to cylinder IV, through cylinder
It is filled in pressurized tanks B after IV compression.Suction pathway: A → h → c → IV；Exhaust pathway: IV → c → g → B.
5) control valve h, g are closed, control valve i, e are opened, is supplied using pressurized tanks B as gas source to cylinder VI, through cylinder
It is filled in high pressure CNG storage tank 2 after VI compression.Suction pathway: B → i → d → VI；Exhaust pathway: VI → d → e → high pressure CNG storage
Tank.
6) it repeats the above steps, until the pressure of high pressure CNG storage tank 2 reaches setting value (value determines according to demand).It fills
After gas, aforementioned all control valves are closed, inflation cylinder 4 is switched back into dynamic mode.
As shown in figure 3, respectively inflation cylinder 4 is connected using mixed connection, when one stage of compression, cylinder II, IV, VI simultaneously will pressurization storage
After tank A is full of maximum pressure value is reached for the first time, cylinder II individually continues to inflate to pressurized tanks A, and cylinder IV, VI will simultaneously
Carry out two-stage compression, when pressurized tanks B full of i.e. reach maximum pressure value for the first time after, cylinder IV individually to pressurized tanks B after
Continuous inflation, cylinder VI then carry out three stage compression, and by gas compression to high pressure CNG storage tank 2, subsequent compression then enters multi-cylinder string
Join compact model.Specific step is as follows:
1) after entering modes of inflation, (control valve that do not point out is silent by opening control valve b, c, d and control valve a, m, n, f, j, k
Recognize closing), civil natural gas enters in cylinder II by control valve a, b, enters in cylinder IV by control valve a, m, c, passes through
Control valve a, m, n enter in cylinder VI, while carrying out one stage of compression, and after compression, the gas in cylinder II passes through control valve
B, f enters pressurized tanks A, and the gas in cylinder IV enters in pressurized tanks A by control valve c, j, f, the gas in cylinder IV
Enter in pressurized tanks A by control valve d, k, j, f.
2) after pressurized tanks A is full of for the first time, control valve m is closed, and control valve j is closed, and control valve h is opened.Cylinder II
It continues on control valve a, b air-breathing and carries out one stage of compression.The gas of pressurized tanks A discharge enters cylinder IV by control valve h, c
It is interior, enter in cylinder VI by h, n, d, while carrying out two-stage compression.
3) after pressurized tanks B is full of maximum pressure value is reached for the first time, control valve n, k are closed, and control valve i, e are opened.
Cylinder IV continues on control valve h, c air-breathing and carries out two-stage compression.The gas of pressurized tanks B discharge enters cylinder by valve i, d
Three stage compression is carried out in VI, compressed gas enters in high pressure CNG storage tank 2 by d, e.It connects then into multi-cylinder and compresses mould
Formula.
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 system includes two pressurized tanks and a high pressure CNG storage tank, i.e. natural gas 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 (9)
1. a kind of CNG engine multi-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 in-engine at least two cylinder of CNG as inflation cylinder (4), is at by closing cylinder assembly (6) and closes cylinder
State, and so that the spark plug (45) for inflating cylinder (4) is failed by ECU；
2) using cylinder remaining in CNG engine as actuating cylinder (41), the actuating cylinder (41) runs well, and passes through burning
The power that natural gas provides drives inflating air cylinder (4)；
3) the inflation cylinder (4) under the action of actuating cylinder (41) as piston type compressor cylinder, with filling at the top of it
Gas channel (5) sucks natural gas as natural gas access way, after one or many compressions, is finally filled with high pressure CNG storage
In tank (2)；
In above-mentioned steps, entire gas replenishment process is controlled by ECU；
Civil natural gas is repeatedly compressed as caching using pressurized tanks (3)；In compression process, the pressurized tanks
(3) it can not only be used for storage tank and store compressed natural gas, supplied but also as gas source to inflation cylinder (4).
2. CNG engine multi-cylinder according to claim 1 is from inflation method, it is characterised in that: respectively inflate cylinder (4) and use
Airing form in parallel sucks natural gas from the same gas source, natural gas is pressed into the same storage tank after being compressed.
3. CNG engine multi-cylinder according to claim 1 is from inflation method, it is characterised in that: respectively inflate cylinder (4) and use
Series connection airing form, the low pressure natural gas from civil natural gas gas source (1) are sucked by first inflation cylinder (4), are successively passed through
After crossing each inflation cylinder (4) compression, by the last one inflation cylinder (4) indentation high pressure CNG storage tank (2)；In series connection inflation side
Under formula, the pressurized tanks (3) of setting one are as caching between adjacent two inflation cylinder (4).
4. CNG engine multi-cylinder according to claim 1 is from inflation method, it is characterised in that: respectively inflate cylinder (4) and use
Mixed connection airing form, i.e., the airing form that airing form and series connection airing form in parallel are combined with each other.
5. CNG engine multi-cylinder according to claim 4 is from inflation method, it is characterised in that: packet in the CNG engine
Containing n inflation cylinder (4), n >=3, wherein preceding n-1 inflation cylinder (4) is in parallel from civil natural gas gas source (1) or pressurized tanks
(3) natural gas is sucked in, and natural gas is input in n-th of inflation cylinder (4) after being compressed；N-th of inflation cylinder (4) with
Natural gas is pressed into the pressurized tanks (3) or high pressure CNG of next stage by preceding n-1 inflation cylinder (4) after being compressed as gas source
In storage tank (2)；Preceding n-1 inflation cylinder (4) is in identical stroke, n-th of inflation cylinder (4) and preceding n-1 inflation cylinder
(4) progressive error is differed.
6. CNG engine multi-cylinder according to claim 4 is from inflation method, it is characterised in that: respectively inflate cylinder (4) simultaneously
Natural gas is sucked from civil natural gas gas source (1), first order pressurized tanks (3) are filled with after being compressed；First order pressurized tanks
(3) after reaching maximum pressure, a part inflation cylinder (4) continues the inflation into first order pressurized tanks (3), another part inflation
Cylinder (4) for gas source, is inflated with first order pressurized tanks (3) into second level pressurized tanks (3)；The rest may be inferred, and upper level increases
After pressure storage tank (3) reaches maximum pressure, partial inflation cylinder (4) is using it as gas source, the inflation into next stage pressurized tanks (3),
Until afterbody pressurized tanks (3) are filled in high pressure CNG storage tank (2) after being compressed as gas source.
7. it is a kind of for realize method described in claim 1 and the CNG engine multi-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)
With for driving the actuating cylinder (41) of inflation cylinder (4), the quantity of inflation cylinder (4) is no less than two；The inflation
Cylinder (4) is provided with for keeping what its cylinder intake valve (42), cylinder exhaust valve (43) be in closed state to close cylinder assembly
(6)；Filling channel (5) are provided in the cylinder head (44) of inflation cylinder (4)；The system further include pressurized tanks (3) and
Pipe network is connected, the connection pipe network is for connecting filling channel (5), civil natural gas gas source (1), pressurized tanks (3) and high pressure
CNG storage tank (2)；Check valve (71) and control valve (7), the high pressure CNG storage tank (2) are provided on the pipeline of the connection pipe network
It is provided with pressure sensor (81) on upper and/or coupled pipeline, it is on the pressurized tanks (3) and/or coupled
Pressure sensor (81) are provided on pipeline；It is described to close cylinder assembly (6), spark plug (45), control valve (7), pressure sensor
(81) it is respectively connected in ECU, entire gas replenishment process is controlled by ECU.
8. CNG engine multi-cylinder according to claim 7 is from inflation system, it is characterised in that: respectively inflate the company of cylinder (4)
Mode is connect as in parallel, series connection or mixed connection.
9. CNG engine multi-cylinder according to claim 7 or 8 is from inflation system, it is characterised in that: the pressurized tanks
(3) and/or on the input channel of high pressure CNG storage tank (2) it is provided with cooler (8).
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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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| 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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