CN102890513B - Digital differential control system for gas-liquid flow - Google Patents
Digital differential control system for gas-liquid flow Download PDFInfo
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- CN102890513B CN102890513B CN201210385174.5A CN201210385174A CN102890513B CN 102890513 B CN102890513 B CN 102890513B CN 201210385174 A CN201210385174 A CN 201210385174A CN 102890513 B CN102890513 B CN 102890513B
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Abstract
The invention provides a kind of digital differential control system for gas-liquid flow, comprise the some variable valve be arranged on controlled device, described some variable valve are by No. 1, No. 2 of the size number consecutively according to flow area ... n variable valve forms, and the flow area of each variable valve is respectively S
1, S
2... S
n, wherein n is valve number, and the through-flow total area of all variable valve is 2
j-1, wherein j is the sum of valve; When the area of each variable valve arranges from big to small or arranges from small to large, the areal array of valve becomes a Geometric Sequence, and the common ratio when area of each variable valve arranges from big to small is 1/2, and the common ratio when area of each variable valve arranges from small to large is 2.At controlled device load from 100% ~ 0% free adjustment, utilize the opening and closing of each valve, making in internal combustion engine and gas fired-boiler liquid inlet volume adjustment process can one-time-reach-place, and can fine adjustment be accomplished, power bracket internal combustion engine being always worked in adapt and lower oil consumption regional work.
Description
[technical field]
The present invention relates to flow control technique field, particularly a kind of digital differential control system for gas-liquid flow; Can be used for automotive fuel (gas, liquid), flow control that heat-treatment furnace fuel, combustion gas (fuel oil) boiler fuel, chemical industry (gas, liquid) are prepared burden.
[background technology]
The current internal combustion engine overwhelming majority is stroke piston combustion engine, and stroke piston combustion engine peak power is directly related with its displacement size.In reciprocating internal combustion engine, the strokes of feed liquor (gas) amount and the position of the Upper-lower Limit point of throw of poston, piston diameter and piston etc. are relevant, and in fact the upper and lower dead-centre position of throw of poston, piston diameter are all unalterable, toggle is the also nonadjustable of rigidity, therefore the air capacity of this kind of reciprocating-piston gear train be all fixing, can not change.But in IC Engine Design process, be all generally to configure the power of internal combustion engine according to limit index such as maximum load quality, the speed of a motor vehicle of the highest permission, the acceleration of shortest time and maximum ramp angles.In the case, although the peak power of internal combustion engine meets the driving requirements of motor vehicle in above-mentioned limit load situation, and in fact motor vehicle is in use, under being not all in this ultimate limit state under considerable situation, traveling motor vehicle of such as, in the urban district motor vehicle of low speed driving, zero load or few year etc.It is just less than configured Vehicular internal combustion engine peak power many that motor vehicle travels required power under this low load condition, and this just forces internal combustion engine can only work under the slow-speed of revolution, low load condition.The fuel that stroke piston combustion engine consumes at underload and slow-speed of revolution duty and exhaust pollution, will higher higher than rotating speed far away time and the larger economical operation region of load, the characteristic of this internal combustion engine is also cause low, the with serious pollution major reason of the motor vehicle internal combustion engine thermal efficiency.Therefore, according to the size variation of load in the actual use procedure of motor vehicle, feed liquor (gas) amount of in good time adjustment internal combustion engine, thus the peak power of adjustment internal combustion engine, power bracket internal combustion engine being always worked in adapt and lower oil consumption region, fundamentally could eliminate high, the with serious pollution performance deficiency of internal combustion engine fuel consume under low load condition.
Heat-treatment furnace, fuel gas (fuel oil), boiler fuel, chemical industry (gas, liquid) flow liquid of preparing burden all configures under peak power in addition, along with treatment capacity and temperature variation, its input liquid (gas) amount also wants timely adjustment, otherwise burning can be caused insufficient, degradation under efficiency.
In the traditional case, regulate feed liquor (gas) amount usually to use stepper motor to change the aperture of valve, and then regulate feed liquor (gas) amount of internal combustion engine and gas fired-boiler etc.Stepper motor regulates, and the motion indeed through stepper motor controls that the anglec of rotation of spool realizes, and this kind of control method can form two kinds of fatal shortcomings, and the angle of first Spool rotating cannot accurately control; Its two be can not accomplish in adjustment process one step joint put in place, rotate to a certain when determining position angle, could must arrive through adjacent angle, this power bracket just making internal combustion engine and gas fired-boiler not always work in adapt and lower oil consumption region.
[summary of the invention]
The object of this invention is to provide a kind of digital differential control system for gas-liquid flow, making in internal combustion engine and gas fired-boiler liquid inlet volume adjustment process can one-time-reach-place, and can accomplish fine adjustment.
To achieve these goals, the present invention adopts following technical scheme:
A kind of digital differential control system for gas-liquid flow, comprise the some variable valve be arranged on controlled device, described some variable valve are by No. 1, No. 2 of the size number consecutively according to flow area ... n variable valve forms, and the flow area of each variable valve is respectively S
1, S
2... S
n, wherein n is valve number, and the through-flow total area of all variable valve is 2
j-1, wherein j is the sum of valve; When the area of each variable valve arranges from big to small or arranges from small to large, the areal array of valve becomes a Geometric Sequence, and the common ratio when area of each variable valve arranges from big to small is 1/2, and the common ratio when area of each variable valve arranges from small to large is 2.
The present invention further improves and is: S
1, S
2... S
nduring for arranging from big to small according to area, S
n=2S
n+1, n=1,2 ... j, the flow area of last n variable valve is 1 square measure, i.e. S
n=1.
The present invention further improves and is: S
1, S
2... S
nduring for arranging from small to large according to area, the flow area of No. 1 variable valve is 1 square measure, i.e. S
1=1, S
n=1/2S
n+1, n=1,2 ... j.
The present invention further improves and is: No. 1, No. 2 ... each of the n variable valve respectively control signal of corresponding binary code, each variable valve open mode is " 1 ", and closed condition is " 0 "; By No. 1, No. 2 ... the open area of n variable valve is converted to binary number, if there is decimal, then by decimal round, the figure place of binary number should be equal with the number of variable valve, if not etc., from binary first place, mend " 0 ", until figure place is equal.
The present invention further improves and is: the opening of each variable valve uses " 0 " and " 1 " of binary number to express, and " 0 " represents closed condition, and " 1 " represents opening.
The present invention further improves and is: the open area of a minimum variable valve is 1 square measure.
The present invention further improves and is: square measure is determined by the design feed liquor/tolerance of controlled device and design current velocity, and its value is the ratio of design feed liquor/tolerance and design current velocity.
The present invention further improves and is: each valve is independently completely, is arranged in the optional position of controlled device.
The present invention further improves and is: described No. 1, No. 2 ... n variable valve is arranged on controlled device internal combustion engine or gas fired-boiler.
Relative to prior art, the present invention has the following advantages: at the load such as internal combustion engine and gas fired-boiler from 100% ~ 0% free adjustment, utilize the opening and closing of each valve, making in internal combustion engine and gas fired-boiler liquid inlet volume adjustment process can one-time-reach-place, and can fine adjustment be accomplished, power bracket internal combustion engine being always worked in adapt and lower oil consumption regional work, fundamentally eliminate high, the with serious pollution performance deficiency of internal combustion engine fuel consume under low load condition, gas fired-boiler also can always work in efficient state.
[accompanying drawing explanation]
Fig. 1 is digital differential control system for gas-liquid flow principle schematic;
Fig. 2 is arrangement and the flow area feature schematic diagram of each valve of the present invention;
When Fig. 3 is for being set to 8 valves, under full load situation, the opening residing for each variable valve;
When Fig. 4 is for arranging 8 valves, and when being adjusted to former flow 50%, each variable valve status;
When Fig. 5 is for arranging 8 valves, and when being adjusted to former flow 75%, each variable valve status;
When Fig. 6 is for arranging 8 valves, and when being adjusted to former flow 45%, each variable valve status.
[embodiment]
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The digital differential control system for gas-liquid flow of internal combustion engine provided by the invention and gas fired-boiler etc. can overcome the shortcoming of traditional stepper motor adjustment completely, accomplishes that a fine adjustment puts in place.The principle of this gas-liquid flow differential control system is represented by Fig. 1, and in figure, horizontal ordinate S is the flow area of valve, and ordinate Q is gas-liquid flow, at a certain setting flow Q
0under, total flow area of valve is represented by triangle area OAB, the total flow area after traffic figure differential regulable control is adopted to be represented by shaded area in figure, namely triangle area is replaced by the rectangular area of several valves, if need to regulate very accurately, then can arrange multiple valve, its shaded area is just enough close to triangle area.Each valve is independently completely, according to required adjustment structure, can be arranged in arbitrarily any position of mechanism.Gas-liquid flow differential control system of the present invention is made up of j controllable valve (solenoid valve etc.), and their area is respectively S
1, S
2... S
n, wherein n is valve number, if S
n=1 square measure, the weighting coefficient of valve is 2
n-1, the total through-flow total area of all valves is 2
j-1, wherein j is the sum of valve, and the area of each valve equals weighting coefficient and the S of this valve
nproduct, the area relationship of each valve is S
i=2S
i+1, the area of each valve arranges from big to small, and shown in Fig. 2, the areal array of valve becomes a Geometric Sequence, and its common ratio is 1/2, and it meets the character of Geometric Sequence completely, and square measure determines according to the through-flow total area under internal combustion engine and gas fired-boiler setting operating mode.Arrange each valve open mode for " 1 ", closed condition is " 0 ", so just constitutes 2 by the open and close of each valve
nindividual flow control aperture.Flow control aperture is just in time binary number, and binary " 1 " and " 0 " then just have expressed the state of each valve "on" and "off".Directly accomplish that a step joint puts in place by the "on" and "off" of each valve.
In actual use, flow first corresponding to the design power of internal combustion engine and design feed liquor (gas) amount of gas fired-boiler is the total area of valve opening, and then according to required adjust flux, determine "ON" and the "Off" state of each valve, such as use 8 valves, the total j=8 of valve, first according to the weighting coefficient 2 of each valve of formulae discovery
n-1, and then according to formula S
i=2
n-1s
ncalculate the area of each valve, the weighting coefficient as first valve is 2
n-1=2
8-1the area of=128, first valve is S
1=1281=128, the weighting coefficient of second valve is 2
n-1=2
7-1the area of=64, second valve is S
2=641=64, in like manner can calculate weighting coefficient and the area of other each valve, arrange according to the size of each valve, be respectively 128,64,32,16,8,4,2,1, the square measure of the last valve is 1, then the aperture of valve opening is: the N=total area/(2
j-1), when feed liquor (gas) amount is (time at full capacity) during design discharge, valve opening aperture is 100%, that is: the N=total area/(2
8-1)=100%, and in total load situation, the total area that valve is opened is: the total area=N × (2
8-1)=100% × 255=255, the open area of valve being converted to binary number is just the opening of each valve, and namely the decimal system 255 is converted to binary number is 11111111, i.e. the valve standard-sized sheet of all correspondences, shown in Fig. 3, then ensure that the full load operation such as engine and gas fired-boiler.When feed liquor (gas) amount is the x% of design discharge, namely the aperture of valve is x%, and the total area that valve opening is opened is: the total area=N × (2
8-1)=x% × 255, are converted to binary number, then the opening residing for each valve by the total area that valve opening is opened.
If after Binary Conversion, binary figure place should be equal with the sum of valve, if the number of the not enough valve of binary figure place, mends " 0 ", until binary figure place is equal with the number of valve from first place.
In fig. 2, the position of each variable valve and the feature of size is arranged.If internal combustion engine and gas fired-boiler run under design conditions, namely at full capacity time, the total area that valve opening is opened is just valve opening aperture and (2
j-1) product, the i.e. total area=N × (2
j-1)=100% × (2
j-1), wherein j be variable valve sum is set.What such as arrange now variable valve adds up to 8, then the total area=N × (2
8-1)=100% × (2
8-1)=255 square measures, 255 square measures being converted to binary number is 11111111, and " 1 " expression of binary number is opened, " 0 " then represents pass, at this moment each variable valve status is just standard-sized sheet, and the state namely residing for each variable valve is shown in 11111111, Fig. 3.As 50% of total load will be adjusted to, then the total area=(2 of valve opening unlatching
8-1) × 50%=127.5, the data obtained round, this aperture total area is 128 square measures, is converted to scale-of-two, has 10000000 by 128, and namely only have and open number one variable valve, all the other then locate closed condition, shown in Fig. 4.If adjust to 75% of total load, the total area=(2 that valve opening is opened
8-1) × 75%=191.25, the data obtained round, this aperture total area is 191 square measures, be converted to scale-of-two by 191, have 10111111, that is, as long as 1,3,4,5,6,7, No. 8 variable valve are opened, and No. 2 variable valve place closed conditions, shown in Fig. 5.When regulating below 50%, note when scale-of-two transforms, if figure place is less than 8, then need to start in first place to mend " 0 ", until the number of bits after conversion is equal with the number of variable valve.Such as when needing to regulate 45% of former inspiratory capacity, then the total area=(2 of valve opening unlatching
8-1) × 45%=114.75 ≈ 115, be converted to scale-of-two and mend " 0 " in first place, have 01110011, that is, as long as 2,3,4,7, No. 8 variable valve are opened, all the other all locate closed condition, shown in Fig. 6.
Regulated from above, digital differential control system for gas-liquid flow valve opening opens the total area, rounding up when carrying out scale-of-two and transforming, the error in adjustment can be caused, but this error is very little, generally can not more than 1%, and maximal regulated error occurs in less than 15% of former inspiratory capacity, and generally internal combustion engine and gas fired-boiler design feed liquor (gas) amount can not be adjusted to so little scope.If certainly need to carry out more fine adjustment, the number of the variable valve selected also will be more, then regulate also more steady, the shaded area namely in Fig. 1 is also just similar to triangle area.
But the present invention does not limit to above-mentioned cited embodiment, those skilled in the art can according to principle of work of the present invention and the embodiment provided above, can make various equivalent amendment, equivalent replacement, valve increase and decrease and reconfigure, thus form how new embodiment.
Claims (3)
1. a digital differential control system for gas-liquid flow, it is characterized in that: comprise the some variable valve be arranged on controlled device, described some variable valve are by No. 1, No. 2 of the size number consecutively according to flow area ... n variable valve forms, and the flow area of each variable valve is respectively S
1, S
2... S
n, wherein n is valve number, and the through-flow total area of all variable valve is 2
j-1, wherein j is the sum of valve; When the area of each variable valve arranges from big to small or arranges from small to large, the areal array of valve becomes a Geometric Sequence, and the common ratio when area of each variable valve arranges from big to small is 1/2, and the common ratio when area of each variable valve arranges from small to large is 2;
S
1, S
2... S
nduring for arranging from big to small according to area, S
n=2S
n+1, n=1,2 ... j, the flow area of last n variable valve is 1 square measure, i.e. S
n=1;
S
1, S
2... S
nduring for arranging from small to large according to area, the flow area of No. 1 variable valve is 1 square measure, i.e. S
1=1, S
n=1/2S
n+1, n=1,2 ... j;
No. 1, No. 2 ... each of the n variable valve respectively control signal of corresponding binary code, each variable valve open mode is " 1 ", and closed condition is " 0 "; By No. 1, No. 2 ... the open area of n variable valve is converted to binary number, if there is decimal, then by decimal round, the figure place of binary number should be equal with the number of variable valve, if not etc., from binary first place, mend " 0 ", until figure place is equal;
The open area of a minimum variable valve is 1 square measure;
When regulating below 50%, when scale-of-two transforms, if figure place is less than n position, start in first place to mend " 0 ", until the number of bits after conversion is equal with the number of variable valve;
In actual use, the flow first corresponding to the design feed liquor/tolerance of controlled device is the total area of valve opening, and then according to required adjust flux, determines "ON" and the "Off" state of each valve; When feed liquor/tolerance is design discharge, valve opening aperture is 100%; And in total load situation, the total area that valve is opened is: the total area=N × (2
8-1)=100% × 255=255, the open area of valve being converted to binary number is just the opening of each valve, and namely the decimal system 255 is converted to binary number is 11111111, i.e. the valve standard-sized sheet of all correspondences; When feed liquor/tolerance is the x% of design discharge, namely the aperture of valve is x%, and the total area that valve opening is opened is: the total area=N × (2
8-1)=x% × 255, are converted to binary number, then the opening residing for each valve by the total area that valve opening is opened.
2. digital differential control system for gas-liquid flow according to claim 1, is characterized in that: each valve is independently completely, is arranged in the optional position of controlled device.
3. digital differential control system for gas-liquid flow according to claim 1, is characterized in that: described No. 1, No. 2 ... n variable valve is arranged on controlled device internal combustion engine or gas fired-boiler.
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| CN103969470A (en) * | 2013-02-01 | 2014-08-06 | 中国航空工业集团公司西安飞机设计研究所 | Wind speed check device configuration |
| CN103365306B (en) * | 2013-06-28 | 2016-08-10 | 中国空气动力研究与发展中心高速空气动力研究所 | A kind of high-speed wind tunnel special test compressed air require adjusting means and method |
| CN106525376B (en) * | 2016-11-22 | 2019-04-16 | 中国空气动力研究与发展中心低速空气动力研究所 | A kind of gas flow stepless regulator |
| CN107367368A (en) * | 2017-09-20 | 2017-11-21 | 中国航空工业集团公司哈尔滨空气动力研究所 | A kind of high-precision microjet experiment piping installation |
| CN117270585B (en) * | 2023-11-21 | 2024-02-02 | 深圳市恒永达科技股份有限公司 | Liquid flow control system and method |
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