CN102890513A - Digital differential control system for gas-liquid flow - Google Patents
Digital differential control system for gas-liquid flow Download PDFInfo
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- CN102890513A CN102890513A CN2012103851745A CN201210385174A CN102890513A CN 102890513 A CN102890513 A CN 102890513A CN 2012103851745 A CN2012103851745 A CN 2012103851745A CN 201210385174 A CN201210385174 A CN 201210385174A CN 102890513 A CN102890513 A CN 102890513A
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Abstract
The invention provides a digital differential control system for gas-liquid flow, comprising a plurality of adjusting valves arranged on equipment to be controlled, wherein the plurality of adjusting valves sequentially consist of No.1 adjusting valve, a No.2 adjusting valve,..., and a No.n adjusting valve which are numbered according to the sizes of flow areas, the flow areas of the adjusting valves are respectively S1, S2... Sn, n is the valve number, the total flow area of all the adjusting valves is 2j-1, and j is the total number of the valves; and when the areas of the adjusting valves are arranged from large to small or from small to large, the areas of the valves are combined into a geometric progression, the common ratio is 1/2 when the areas of the adjusting valves are arranged from large to small, and the common ratio is 2 when the areas of the adjusting valves are arranged from small to large. When the load of the equipment to be controlled is freely adjusted within the range of 100%-0%, the liquid inlet quantity of an internal-combustion engine and a gas-fired boiler can be adjusted at one time and can be accurately adjusted due to the on-off of the valves, and the internal-combustion engine always works within an adaptive power range and a lower oil consumption region.
Description
[technical field]
The present invention relates to the flow control technique field, particularly a kind of gas-liquid flow numerical differentiation control system; Can be used for the flow control of automotive fuel (gas, liquid), heat-treatment furnace fuel, combustion gas (fuel oil) boiler fuel, chemical industry (gas, liquid) batching.
[background technology]
The internal combustion engine overwhelming majority is stroke piston combustion engine at present, and the 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 position, piston diameter and the piston of the Upper-lower Limit point of throw of poston etc. are relevant, and in fact the upper and lower dead-centre position of throw of poston, piston diameter all are unalterable, toggle is the also nonadjustable of rigidity, thus the air capacity of this class reciprocating-piston gear train all be fix, can not change.But in the IC Engine Design process, generally all be that the load quality according to maximum, the speed of a motor vehicle, the acceleration of shortest time and the maximum limit index such as ramp angle of the highest permission configure the power of internal combustion engine.In the case, although the peak power of internal combustion engine has satisfied the travel requirement of motor vehicle in above-mentioned limit load situation, and in fact motor vehicle is in use, be not all to be under this ultimate limit state under the considerable situation, for example in the urban district in the motor vehicle, zero load of low speed driving or few year the motor vehicle etc. that travels.Motor vehicle travels needed power just than little many of the Vehicular internal combustion engine peak power that configures under this low load condition, this just forces internal combustion engine to work under the slow-speed of revolution, low load condition.Fuel and exhaust pollution that stroke piston combustion engine consumes in underload and slow-speed of revolution duty, the when higher and larger economical operation zone of load that will be higher than rotating speed far away, the characteristic of this internal combustion engine also is to cause low, the with serious pollution major reason of the motor vehicle internal combustion engine thermal efficiency.Therefore, according to the size variation of loading in the actual use procedure of motor vehicle, adjust feed liquor (gas) amount of internal combustion engine in good time, thereby adjust the peak power of internal combustion engine, high, the with serious pollution performance deficiency of internal combustion engine fuel consume under low load condition could be fundamentally eliminated in the power bracket that internal combustion engine is always worked in adapt and lower oil consumption zone.
Heat-treatment furnace, fuel gas (fuel oil), boiler fuel, chemical industry (gas, liquid) batching flow liquid all configure under peak power in addition, along with treatment capacity and temperature variation, its input liquid (gas) amount is also wanted timely adjustment, otherwise can cause burning insufficient, decrease in efficiency etc.
In the situation that traditional, regulate feed liquor (gas) amount changes valve usually with stepper motor aperture, and then regulate feed liquor (gas) amount of internal combustion engine and gas fired-boiler etc.Stepper motor is regulated, and be actually to control by the motion of stepper motor that the anglec of rotation of spool realizes, and this kind control method can form two kinds of fatal shortcomings, and the angle of first Spool rotating can't accurately be controlled; It two is to accomplish in the adjustment process that step joint puts in place, when rotating to a certain definite position angle, must could arrive through adjacent angle, the power bracket that this just makes internal combustion engine and gas fired-boiler not always work in to adapt and lower oil consumption are regional.
[summary of the invention]
The purpose of this invention is to provide a kind of gas-liquid flow numerical differentiation control system, so that can one-time-reach-place in internal combustion engine and gas fired-boiler feed liquor amount adjustment process, and can accomplish fine adjustment.
To achieve these goals, the present invention adopts following technical scheme:
A kind of gas-liquid flow numerical differentiation control system comprises the some variable valve that are installed on the controlled device, and described some variable valve are by No. 1, No. 2 according to the big or small number consecutively of flow area ... the 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, 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 was arranged from big to small or arranged from small to large, the areal array of valve became a Geometric Sequence, and the common ratio the when area of each variable valve is arranged from big to small is 1/2, and the common ratio the when area of each variable valve is arranged from small to large is 2.
The present invention further improves and is: S
1, S
2... S
nWhen 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 are 1 square measure, i.e. S
n=1.
The present invention further improves and is: S
1, S
2... S
nWhen 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 control signal of the corresponding binary code of n variable valve difference, each variable valve open mode is " 1 ", closed condition is " 0 "; With No. 1, No. 2 ... the open area of n variable valve is converted to binary number, if there is decimal, then with the decimal round, the figure place of binary number should equate with the number of variable valve, if not etc., begin to mend " 0 " from binary first place, until figure place equates.
The present invention further improves and is: the opening of each variable valve uses " 0 " and " 1 " of binary number to express, " 0 " expression closed condition, " 1 " expression 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 definite by design feed liquor/tolerance and the design current velocity of controlled device, 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 fully, is arranged in the optional position of controlled device.
The present invention further improves and is: described No. 1, No. 2 ... the n variable valve is arranged on controlled device internal combustion engine or the gas fired-boiler.
With respect to prior art, the present invention has the following advantages: load from 100%～0% free adjustment at internal combustion engine and gas fired-boiler etc., utilize the opening and closing of each valve, so that can one-time-reach-place in internal combustion engine and gas fired-boiler feed liquor amount adjustment process, and can accomplish fine adjustment, the power bracket that internal combustion engine is 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.
[description of drawings]
Fig. 1 is gas-liquid flow numerical differentiation control system principle schematic;
Fig. 2 is arrangement and the flow area characteristics schematic diagram of each valve of the present invention;
Fig. 3 when being set to 8 valves, under full load situation, the residing opening of each variable valve;
Fig. 4 when 8 valves are set, and when being adjusted to former flow 50%, each variable valve status;
Fig. 5 when 8 valves are set, and when being adjusted to former flow 75%, each variable valve status;
Fig. 6 when 8 valves are set, and when being adjusted to former flow 45%, each variable valve status.
[embodiment]
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail.
The gas-liquid flow numerical differentiation control system of internal combustion engine provided by the invention and gas fired-boiler etc. can overcome the shortcoming that traditional stepper motor is regulated fully, accomplishes that a fine adjustment puts in place.Former reason Fig. 1 of this gas-liquid flow differential control system represents, horizontal ordinate S is the flow area of valve among the figure, and ordinate Q is the gas-liquid flow, at a certain setting flow Q
0Lower, total flow area of valve is represented by triangle area OAB, the total flow area that adopts the traffic figure differential to regulate after controlling is represented by shaded area among the figure, be that triangle area is by the rectangular area replacement of several valves, regulate very accurately if need, then a plurality of valves can be set, its shaded area is just enough near triangle area.Each valve is independently fully, can according to needed adjustment structure, be arranged in arbitrarily any position of mechanism.Gas-liquid flow differential control system of the present invention is comprised of j controllable valve (solenoid valve etc.), and their area is respectively S
1, S
2... S
n, wherein n is valve number, establishes S
n=1 square measure, the weighting coefficient of valve are 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 is arranged from big to small, and is shown in Figure 2, and the areal array of valve becomes a Geometric Sequence, and its common ratio is 1/2, and it meets the character of Geometric Sequence fully, and square measure is to determine according to the through-flow total area under internal combustion engine and the gas fired-boiler setting operating mode.Each valve open mode is set is " 1 ", closed condition is " 0 ", and so just the open and close by each valve have formed 2
nIndividual flow control aperture.The flow control aperture just in time is binary number, and the state of each valve "on" and "off" has then just been expressed in binary " 1 " and " 0 ".Accomplish directly that by the "on" and "off" of each valve step joint puts in place.
In actual the use, be the total area of valve opening according to the design power of internal combustion engine and the corresponding flow of design feed liquor (gas) amount of gas fired-boiler first, and then according to desired adjust flux, determine " opening " and the "Off" state of each valve, for example use 8 valves, the total j=8 of valve, elder generation calculate the weighting coefficient 2 of each valve according to formula
N-1, and then according to formula S
i=2
N-1S
nCalculating the area of each valve, is 2 such as the weighting coefficient of first valve
N-1=2
8-1The area of=128, first valve is S
1=1281=128, the weighting coefficient of second valve are 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, and then the aperture of valve opening is: the N=total area/(2
j-1), when feed liquor (gas) amount is design discharge (during full load), the valve opening aperture is 100%, that is: the N=total area/(2
8-1)=100%, and in the total load situation, the total area opened of valve is: the total area=N * (2
8-1)=100% * 255=255, the open area of valve is converted to binary number just is the opening of each valve, namely to be converted to binary number be 11111111 to the decimal system 255, i.e. all corresponding valve standard-sized sheets, shown in Figure 3, then guaranteed the full load operations such as engine and gas fired-boiler.When feed liquor (gas) amount was the x% of design discharge, namely the aperture of valve was x%, and the total area that valve opening is opened is: the total area=N * (2
8-1)=and x% * 255, the total area that valve opening is opened is converted to binary number, then is the residing opening of each valve.
If after the Binary Conversion, binary figure place should equate with the sum of valve, if the number of the not enough valve of binary figure place begins to mend " 0 " from the first place, until binary figure place equates with the number of valve.
In Fig. 2, the position of each variable valve and the characteristics of size have been arranged.If internal combustion engine and gas fired-boiler move under design conditions, namely when full load, the total area that valve opening is opened is valve opening aperture and (2 just
j-1) product, the i.e. total area=N * (2
j-1)=100% * (2
j-1), wherein j is the sum that arranges of variable valve.Add up to 8 such as what variable valve was set now, then the total area=N * (2
8-1)=100% * (2
8-1) square measure=255, it is 11111111 that 255 square measures are converted to binary number, " 1 " expression of binary number is opened, " 0 " then represents to close, at this moment each variable valve status is standard-sized sheet just, and namely the residing state of each variable valve is 11111111, and is shown in Figure 3.As adjusting to 50% of total load, the total area opened of valve opening=(2 then
8-1) * and 50%=127.5, the data obtained round, this aperture total area is 128 square measures, is converted to scale-of-two with 128, has 10000000, namely only has the number one of unlatching variable valve to get final product, all the other then locate closed condition, and are shown in Figure 4.If adjust to 75% of total load, the total area that valve opening is opened=(2
8-1) * and 75%=191.25, the data obtained round, this aperture total area is 191 square measures, be converted to scale-of-two with 191, have 10111111, that is to say, as long as 1,3,4,5,6,7, No. 8 variable valve is opened, and No. 2 variable valve place closed conditions get final product, and is shown in Figure 5.When regulating below 50%, note when scale-of-two transforms, if 8 of figure place less thaies then need to begin in the first place to mend " 0 ", until the number of bits after changing equates with the number of variable valve.For example working as needs to regulate 45% of former inspiratory capacity, then the total area of valve opening unlatching=(2
8-1) * and 45%=114.75 ≈ 115, be converted to scale-of-two and mend " 0 " in the first place, have 01110011, that is to say, as long as 2,3,4,7, No. 8 variable valve are opened, all the other are all located closed condition and get final product, and are shown in Figure 6.
By with adjusted as seen, gas-liquid flow numerical differentiation control system valve opening is opened the total area, rounding up when carrying out the scale-of-two conversion, can cause the error in the adjusting, but this error is very little, generally can not surpass 1%, and the maximal regulated error occurs in below 15% of former inspiratory capacity, internal combustion engine and gas fired-boiler design feed liquor (gas) amount can not be adjusted to so little scope generally speaking.If certainly need to carry out more fine adjustment, the number of the variable valve of selecting also will be more, and then adjusting is also just more steady, and namely the shaded area among Fig. 1 also just is similar to triangle area.
But the present invention does not limit to above-mentioned cited embodiment, those skilled in the art can be according to the present invention principle of work and the embodiment that provides above, can make the increase and decrease of the various modifications that are equal to, the replacement that is equal to, valve and reconfigure, thereby consist of how new embodiment.
Claims (9)
1. gas-liquid flow numerical differentiation control system, it is characterized in that: comprise the some variable valve that are installed on the controlled device, described some variable valve are by No. 1, No. 2 according to the big or small number consecutively of flow area ... the 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, 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 was arranged from big to small or arranged from small to large, the areal array of valve became a Geometric Sequence, and the common ratio the when area of each variable valve is arranged from big to small is 1/2, and the common ratio the when area of each variable valve is arranged from small to large is 2.
2. gas-liquid flow numerical differentiation control system according to claim 1 is characterized in that: S
1, S
2... S
nWhen 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 are 1 square measure, i.e. S
n=1.
3. gas-liquid flow numerical differentiation control system according to claim 1 is characterized in that: S
1, S
2... S
nWhen 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.
4. gas-liquid flow numerical differentiation control system according to claim 1 is characterized in that: No. 1, No. 2 ... each of the control signal of the corresponding binary code of n variable valve difference, each variable valve open mode is " 1 ", closed condition is " 0 "; With No. 1, No. 2 ... the open area of n variable valve is converted to binary number, if there is decimal, then with the decimal round, the figure place of binary number should equate with the number of variable valve, if not etc., begin to mend " 0 " from binary first place, until figure place equates.
5. gas-liquid flow numerical differentiation control system according to claim 1 is characterized in that: " 0 " and " 1 " expression of the opening use binary number of each variable valve, " 0 " expression closed condition, " 1 " expression opening.
6. gas-liquid flow numerical differentiation control system according to claim 1 is characterized in that: the open area of a minimum variable valve is 1 square measure.
7. according to claim 2,3 or 6 described gas-liquid flow numerical differentiation control system, it is characterized in that: square measure determined by the design feed liquor/tolerance of controlled device and design current velocity, its value is the ratio of design feed liquor/tolerance and design current velocity.
8. gas-liquid flow numerical differentiation control system according to claim 1, it is characterized in that: each valve is independently fully, is arranged in the optional position of controlled device.
9. gas-liquid flow numerical differentiation control system according to claim 1 is characterized in that: described No. 1, No. 2 ... the n variable valve is arranged on controlled device internal combustion engine or the gas fired-boiler.
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Cited By (5)
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| CN103365306A (en) * | 2013-06-28 | 2013-10-23 | 中国空气动力研究与发展中心高速空气动力研究所 | Compressed air flow regulating device and compressed air flow regulating method used for high-speed wind tunnel special test |
| 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 |
| CN106525376A (en) * | 2016-11-22 | 2017-03-22 | 中国空气动力研究与发展中心低速空气动力研究所 | Air flow stepless adjusting device |
| 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 |
| CN117270585A (en) * | 2023-11-21 | 2023-12-22 | 深圳市恒永达科技股份有限公司 | Liquid flow control system and method |
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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 |
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| 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 |
| CN117270585A (en) * | 2023-11-21 | 2023-12-22 | 深圳市恒永达科技股份有限公司 | Liquid flow control system and method |
| 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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| C06 | Publication | ||
| PB01 | Publication | ||
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