CN103058119B - Liquid filling accuracy control method for liquid filling quantity smaller than minimum measured quantity - Google Patents
Liquid filling accuracy control method for liquid filling quantity smaller than minimum measured quantity Download PDFInfo
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- CN103058119B CN103058119B CN201310008343.8A CN201310008343A CN103058119B CN 103058119 B CN103058119 B CN 103058119B CN 201310008343 A CN201310008343 A CN 201310008343A CN 103058119 B CN103058119 B CN 103058119B
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- overshoot
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- percentum
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- 239000007788 liquid Substances 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000003139 buffering effect Effects 0.000 claims description 55
- 239000000446 fuel Substances 0.000 claims description 52
- 235000013361 beverage Nutrition 0.000 description 19
- 239000003921 oil Substances 0.000 description 17
- 238000006243 chemical reaction Methods 0.000 description 15
- 238000006073 displacement reaction Methods 0.000 description 12
- 238000005259 measurement Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a liquid filling accuracy control method for liquid filling quantity smaller than minimum measured quantity. The method is characterized by including: drawing a relation curve between over-filling percentage of a liquid filling machine and buffer frequency of a variable frequency motor in a variable frequency hydraulic control system of the liquid filling machine, and performing accuracy control to the liquid filling machine during quantitative liquid filling according to the relation curve. The over-filling percentage is the ratio of over-filling quantity V to preset filling quantity V0. The over-filling quantity V is obtained according to an equation: V=0.1154+0.0527*In[0.1030*(0.0659-9.5496/n)*(0.1047n-10.9418)+0.1118], wherein n is buffer speed of the variable frequency motor; buffer frequency f is equal to n/60. Aiming at different filling quantities during actual liquid filling, different buffer frequencies can be selected, the over-filling percentage V/V0 can be controlled with a smaller range of errors, and accordingly liquid filling accuracy control for quantitative liquid filling with the liquid filling quantity smaller than the minimum measured quantity is achieved.
Description
Technical field
The present invention relates to the control method of liquid filling precision.
Background technology
The control of liquid filling precision relates to the various aspects of our productive life, and such as the retail in bulk of liquid beverage, the fuel oil of fuel charger is sold etc.Under current engineering factor, the liquid filling precision that country relates to national economy to some has been carried out specification and requirement, these specification and requirement are all for requirement more than certain adding amount, and lower than certain adding amount, because prior art condition cannot be carried out precision control at all, therefore can not put into effect corresponding specification and requirement.For having a strong impact on of national economy---add accuracy, the minimum of the fuel charger that China produces is now measured is generally 5 liters, at volume read-out, is more than 5 liters, the error of refueling can not surpass in ± 0.3%, when volume read-out is less than 5 liters, add accuracy just uncontrollable, also cannot standard.Therefore, at present at the many petrol service stations of some motorcycle refueling business, tend to occur the phenomenon of loss, it is measured that its reason is mainly that the volume read-out due to motor bike is less than the minimum of fuel charger, uncontrollable the caused result of precision.
The minimum of liquid is measured, just refers to that precision is controlled when liquid filling amount is when this is above; And liquid filling amount is when this is following, filling precision is just uncontrollable.In general, the minimum of the fuel charger that China produces is now measured is generally 5 liters, that is to say, when volume read-out is less than 5 liters, larger error may appear in fuel charger.In fact, when volume read-out is less than 5 liters, the error of the oiling overwhelming majority is minus deviation, and the actual oil pump capacity of fuel charger can be more.And motorcycle refueling amount is all lower than 5 liters conventionally, this is also that some often occur losing oily reason for the petrol service station of motorcycle refueling causes.
Along with the increase year after year of vehicle guaranteeding organic quantity, refuel and become a major issue in people's daily life.The routine oiling mode of existing regular fuel fuel charger comprises two kinds: a kind of is quantitative refueling, such as adding 40 liters of oil, or adds 40 yuan of oil; Another is random oiling, for example top off.In quantitative refueling process, maximum problem is " overshoot " problem, and fluid and hydraulic unit have little time to stop, and cause and add oily phenomenon.Common fuel charger is that the shutoff by electromagnetic valve reduces " overshoot ", but causes again the increase of " water attack effect " and energy consumption simultaneously.
At present, the fuel charger patent of the relevant converter technique that the inventor proposes has solved the problem of above-mentioned overshoot, on the basis of fuel charger hydraulic control system that adopts converter technique, electromagnetic valve in hydraulic efficiency pressure system is removed, to simplify the structure of hydraulic efficiency pressure system, reduce complete machine cost, by using the new control method of quantitative refueling, the fuel charger that has made to remove electromagnetic valve can reach better effect aspect quantitative refueling control.
But frequency conversion fuel charger is mainly introduced the problem that buffering frequency solves " overshoot ", and this buffering frequency is all changeless for different volume read-outs.In the situation that volume read-out is larger, this control method has well solved " overshoot " problem, but when volume read-out hour, such as giving motorcycle refueling, can cause situation noted earlier, the actual oil pump capacity of fuel charger can be more, cause the more phenomenon that there will be loss of petrol service station motorcycle refueling business.Therefore, existing method can not be applicable to the control lower than the measured fuel charger quantitative refueling precision of minimum.
Existing, with electric-motor pump, send and use valve to carry out in the liquid filling system of adding amount control, as long as need to carry out precision control, just there will be above-mentioned overshooting problem, even if adopted variable frequency control motor, there will be too the uncontrollable problem of minimum adding amount precision.
Summary of the invention
The object of the invention is to overcome shortcoming of the prior art with not enough, provide a kind of when quantitative liquid is annotated, be equally applicable to the liquid filling accuracy control method of liquid filling amount when measured lower than minimum.By this method, no matter adding amount is how many, can make liquid filling machine precision be well controlled, and this control method is used on fuel charger, is of great immediate significance.
In order to achieve the above object, the present invention is achieved by following technical proposals: a kind of for liquid filling amount lower than the measured liquid filling accuracy control method of minimum, it is characterized in that: the relation curve in the overshoot percentum of drafting liquid filling machine and liquid filling machine variable frequency hydraulic control system between the buffering frequency of variable-frequency motor, according to relation curve, realize liquid filling machine precision in quantitative liquid filling is controlled; Described overshoot percentum is overshoot V and preset adding amount V
0ratio; Described overshoot V is obtained by following formula:
Wherein, the buffering rotating speed that n is variable-frequency motor; Buffering frequency is
In liquid filling machine, use variable-frequency motor to carry out pumping, liquid filling machine precision is the ratio of actual adding amount and preset adding amount, and in liquid filling machine precision, overshoot accounts for the major part of liquid filling error, so in order to improve liquid filling machine precision, we must control overshoot percentum.In such scheme, the present invention draws the relation curve between overshoot percentum and buffering frequency, making can be for different preset adding amount in actual liquid filling, in liquid filling machine variable frequency hydraulic control system, set different buffering frequencies, can control overshoot percentum (for example 0.1%) in a less error limit, to realize effective control of liquid filling machine precision, and realize any adjusting of liquid filling machine precision.
More particularly, described buffering frequency refers to that liquid filling machine is at the frequency of operation that enters lead filling variable-frequency motor during the stage of setting; Buffering rotating speed refers to that liquid filling machine is at the rotating speed that enters lead filling variable-frequency motor during the stage of setting.
Describedly according to relation curve, realize liquid filling machine precision in quantitative liquid filling is controlled and comprised the steps:
The first step deposits the relation curve between the buffering frequency of variable-frequency motor in the overshoot percentum of drawn liquid filling machine and liquid filling machine variable frequency hydraulic control system in the control mainboard of liquid filling machine variable frequency hydraulic control system; Selected overshoot percentum in the mainboard of liquid filling machine variable frequency hydraulic control system
Second step, during liquid filling, inputs preset adding amount V
0, the control mainboard in liquid filling machine control system is according to preset adding amount V
0with selected overshoot percentum
according to relation curve, determine corresponding buffering frequency;
The 3rd step, controls mainboard according to definite buffering frequency, the rotating speed of variable-frequency motor is controlled, to realize the control to liquid filling machine precision in quantitative liquid filling.
Control mainboard in described liquid filling machine control system is according to preset adding amount V
0with selected overshoot percentum
according to relation curve, determining that corresponding buffering frequency one of refers to as follows determines: (one) is directly by relation curve corresponding to this preset adding amount and selected overshoot percentum
frequency F corresponding to intersection point be defined as cushioning frequency; (2), after determining F by mode (), between 0 ~ F, frequency of random selection is as buffering frequency.
Described liquid filling machine is fuel charger.
Overshoot percentage range selected in the described first step is
because thereby fuel charger also can be subject to other trickle impact impacts, add oil content, therefore overshoot percentage range is controlled within the scope of this, can fully guarantee to reach the accuracy requirement of national regulation.
In this step, selected overshoot percentum is the initialized selection of fuel charger, in fuel charger use procedure, if other trickle impacts of system change adding the impact of accuracy, can revise and regulate selected overshoot percentum, thereby guarantee fuel charger run duration, fuel charger precision meets the error of national regulation.
Fuel charger precision is the ratio of actual volume read-out and preset volume read-out, and in fuel charger precision, overshoot accounts for the major part of oiling error, so in order to improve fuel charger precision, compare with the error 0.3% of national regulation, we must control overshoot percentum.The present invention draws the relation curve between overshoot percentum and buffering frequency, making can be for different preset volume read-out in reality is refueled, in oiling machine frequency-conversion hydraulic control, set different buffering frequencies, can control overshoot percentum (for example 0.1%) in a less error limit, to realize effective control of fuel charger precision, and realize any adjusting of fuel charger precision in the error limit of national regulation.
When liquid filling machine is fuel charger in the present invention, the liquid filling machine variable frequency hydraulic control system adopting in the present invention refers to oiling machine frequency-conversion hydraulic control, and this control system is to be connected to form as follows by motor, frequency converter, positive displacement pump, oil separator, flow measurement converter, coder, control mainboard, indicating device, oil sight device, oil gun: petrol storage tank is connected successively with positive displacement pump, oil separator, flow measurement converter, oil sight device and oil gun; Flow measurement converter is also connected with indicating device successively with coder, control mainboard; The output of controlling mainboard also connects frequency converter, motor and positive displacement pump successively.This control system is by control to replace electromagnetic valve to realize to the rotating speed of positive displacement pump in oiling machine frequency-conversion hydraulic control, the precision of quantitative refueling to be controlled.The present invention is the relation curve of drawing between overshoot percentum and buffering frequency, making can be for different preset volume read-out in reality is refueled, in oiling machine frequency-conversion hydraulic control, set different buffering frequencies, to determine the rotating speed of the variable-frequency motor that drives positive displacement pump, thereby the rotating speed to positive displacement pump is controlled, realize the effective control lower than the measured fuel charger precision of minimum to volume read-out in quantitative refueling.
Compared with prior art, tool of the present invention has the following advantages and beneficial effect: the present invention is by drawing the relation curve between overshoot percentum and buffering frequency, making can be for different preset adding amount in actual liquid filling, select different buffering frequencies, can control overshoot percentum (for example 0.1%) in a less error limit, even measured lower than minimum with realization liquid filling amount in quantitative liquid filling, liquid filling machine precision still can be controlled effectively.
Accompanying drawing explanation
Fig. 1 is the overshoot percentum of fuel charger in control method of the present invention and the schematic diagram that cushions relation curve between frequency.
The specific embodiment
Below in conjunction with accompanying drawing and the specific embodiment, the present invention is described in further detail.
Embodiment mono-
The present embodiment be take liquid filling machine as fuel charger, preset volume read-out V
0for 2L(volume read-out measured lower than the minimum of fuel charger), the overshoot percentum of setting
for example is to describing below.
Method of the present invention be the overshoot percentum of drawing fuel charger with oiling machine frequency-conversion hydraulic control in relation curve between the buffering frequency of variable-frequency motor, according to relation curve, realize fuel charger precision control in quantitative refueling; Wherein, overshoot percentum is overshoot V and preset volume read-out V
0ratio; Overshoot V is obtained by following formula:
Wherein, the buffering rotating speed that n is variable-frequency motor; Buffering frequency is
The buffering frequency of above-mentioned variable-frequency motor refers to that fuel charger is the frequency of operation of 0.3 liter of oiling variable-frequency motor during the stage at the lead that enters setting; Buffering rotating speed refers to that fuel charger is the rotating speed of 0.3 liter of oiling variable-frequency motor during the stage at the lead that enters setting.
In control method of the present invention overshoot percentum and buffering frequency between relation curve schematic diagram as shown in Figure 1, in reality is refueled, method of the present invention can be for different preset volume read-outs, select different buffering frequencies, can control overshoot percentum in a less error limit, to realize in quantitative refueling the effective control lower than the measured fuel charger precision of minimum.
The present invention realizes fuel charger precision in quantitative refueling is controlled and comprised the steps: according to relation curve
The first step deposits the relation curve between the buffering frequency of variable-frequency motor in the overshoot percentum of drawn fuel charger and oiling machine frequency-conversion hydraulic control in the control mainboard of oiling machine frequency-conversion hydraulic control; Selected overshoot percentum in the mainboard of oiling machine frequency-conversion hydraulic control
(overshoot percentum can be
scope in select voluntarily, overshoot percentum is less, adds accuracy higher during fuel charger quantitative refueling);
Second step, during oiling, oiling person inputs preset volume read-out V
0for 2L, the control mainboard in oiling machine control system is according to preset volume read-out V
0with selected overshoot percentum
the scope of determining corresponding buffering frequency according to relation curve is 0 ~ 16Hz;
The 3rd step, controlling mainboard is 0 ~ 16Hz according to definite buffering frequency limit, the rotating speed of variable-frequency motor is controlled, to realize the control to fuel charger precision in quantitative refueling.
Control mainboard in above-mentioned oiling machine control system is according to preset volume read-out V
0with selected overshoot percentum
according to relation curve, determine that the scope of corresponding buffering frequency is that 0 ~ 16Hz one of refers to as follows and to determine: (one) is directly by relation curve corresponding to this preset volume read-out and selected overshoot percentum
frequency F=16Hz corresponding to intersection point be defined as cushioning frequency; (2), after determining F=16Hz by mode (), between 0 ~ 16Hz, frequency of random selection is as buffering frequency.
By above-mentioned steps, can control overshoot percentum and be less than 0.1%, comprehensively, after other fine error, when volume read-out is measured lower than minimum, add the error criterion that accuracy still reaches national regulation.
The oiling machine frequency-conversion hydraulic control adopting in the present invention is to be connected to form as follows by motor, frequency converter, positive displacement pump, oil separator, flow measurement converter, coder, control mainboard, indicating device, oil sight device, oil gun: petrol storage tank is connected successively with positive displacement pump, oil separator, flow measurement converter, oil sight device and oil gun; Flow measurement converter is also connected with indicating device successively with coder, control mainboard; The output of controlling mainboard also connects frequency converter, motor and positive displacement pump successively.This control system is by control to replace electromagnetic valve to realize to the rotating speed of positive displacement pump in oiling machine frequency-conversion hydraulic control, the precision of quantitative refueling to be controlled.The present invention is by drawing the relation between overshoot percentum and buffering frequency, making can be for different preset volume read-out in reality is refueled, in oiling machine frequency-conversion hydraulic control, set corresponding buffering frequency, to determine the rotating speed of the variable-frequency motor that drives positive displacement pump, thereby the rotating speed to positive displacement pump is controlled, even measured lower than minimum with realization volume read-out in quantitative refueling, fuel charger precision still can be controlled effectively.
Embodiment bis-
Control method of the present invention is also applicable to volume read-out higher than effective control of the measured fuel charger precision of minimum, and the present embodiment be take liquid filling machine as fuel charger, preset volume read-out V
0for 45L(volume read-out measured higher than the minimum of fuel charger), the overshoot percentum of setting
for example is to describing below.
The present embodiment and embodiment mono-difference are only fuel charger preset parameter volume read-out V
0setting, other parts are consistent with embodiment mono-.
As shown in Figure 1, the volume read-out that is 45L corresponding to preset value (volume read-out is measured higher than the minimum of fuel charger), the present invention realizes fuel charger precision in quantitative refueling is controlled and comprised the steps: according to relation curve
The first step deposits the relation curve between the buffering frequency of variable-frequency motor in the overshoot percentum of drawn fuel charger and oiling machine frequency-conversion hydraulic control in the control mainboard of oiling machine frequency-conversion hydraulic control; Selected overshoot percentum in the mainboard of oiling machine frequency-conversion hydraulic control
(overshoot percentum can be
in scope, select voluntarily, overshoot percentum is less, adds accuracy higher during fuel charger quantitative refueling);
Second step, during oiling, oiling person inputs preset volume read-out V
0for 45L, the control mainboard in oiling machine control system is according to preset volume read-out V
0with selected overshoot percentum
the scope of determining corresponding buffering frequency according to relation curve is 0 ~ 42Hz;
The 3rd step, controlling mainboard is 0 ~ 42Hz according to definite buffering frequency limit, the rotating speed of variable-frequency motor is controlled, to realize the control to fuel charger precision in quantitative refueling.
Control mainboard in above-mentioned oiling machine control system is according to preset volume read-out V
0with selected overshoot percentum
according to relation curve, determine that the scope of corresponding buffering frequency is that 0 ~ 42Hz one of refers to as follows and to determine: (one) is directly by relation curve corresponding to this preset volume read-out and selected overshoot percentum
frequency F=42Hz corresponding to intersection point be defined as cushioning frequency; (2), after determining F=42Hz by mode (), between 0 ~ 42Hz, frequency of random selection is as buffering frequency.
By above-mentioned steps, can control overshoot percentum and be less than 0.1%, comprehensively, after other fine error, when volume read-out is measured lower than minimum, add the error criterion that accuracy still reaches national regulation.
Embodiment tri-
Control method of the present invention is also applicable to other liquid filling fields, and it is that liquid beverage charging machine is as example is to describing below that the present embodiment be take liquid filling machine.
In actual beverage filling, method of the present invention can be for different preset liquid beverage adding amounts, select different buffering frequencies, can control overshoot percentum (for example 0.1%) in a less error limit, to realize in quantitative beverage filling the effective control lower than the measured beverage charging machine precision of minimum.
The present invention realizes liquid beverage charging machine precision in quantitative beverage filling is controlled and comprised the steps: according to relation curve
The first step deposits the relation curve between the buffering frequency of variable-frequency motor in the overshoot percentum of drawn liquid beverage charging machine and liquid beverage charging machine variable frequency hydraulic control system in the control mainboard of liquid beverage charging machine variable frequency hydraulic control system; Selected overshoot percentum in the mainboard of liquid beverage charging machine variable frequency hydraulic control system
(overshoot percentum is less, and the precision of annotating during liquid beverage charging machine quantitative filling is higher);
Second step, during liquid beverage filling, it is V that staff inputs preset adding amount
0, the control mainboard in liquid beverage charging machine control system is according to preset adding amount V
0with selected overshoot percentum
according to relation curve, determine the scope of corresponding buffering frequency;
The 3rd step, controls mainboard according to definite buffering frequency limit, the rotating speed of variable-frequency motor is controlled, to realize the control to liquid beverage charging machine precision in quantitative beverage filling.
Control mainboard in aforesaid liquid beverage charging machine control system is according to preset adding amount V
0with selected overshoot percentum
according to relation curve, determining that the scope of corresponding buffering frequency one of refers to as follows determines: (one) is directly by relation curve corresponding to this preset adding amount and selected overshoot percentum
frequency F corresponding to intersection point be defined as cushioning frequency; (2), after determining F by mode (), between 0 ~ F, frequency of random selection is as buffering frequency.
By above-mentioned steps, can control overshoot percentum in a less error limit, comprehensively, after other fine error, when liquid beverage adding amount is measured lower than minimum, filling precision is controllable joint still.
Above-described embodiment is preferably embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (3)
- One kind for liquid filling amount lower than the measured liquid filling accuracy control method of minimum, it is characterized in that: the relation curve in the overshoot percentum of drafting liquid filling machine and liquid filling machine variable frequency hydraulic control system between the buffering frequency of variable-frequency motor, according to relation curve, realize liquid filling machine precision in quantitative liquid filling is controlled; Described overshoot percentum is overshoot V and preset adding amount V 0ratio; Described overshoot V is obtained by following formula:Wherein, the buffering rotating speed that n is variable-frequency motor; Buffering frequency isDescribed buffering frequency refers to that liquid filling machine is at the frequency of operation that enters lead filling variable-frequency motor during the stage of setting; Buffering rotating speed refers to that liquid filling machine is at the rotating speed that enters lead filling variable-frequency motor during the stage of setting;Describedly according to relation curve, realize liquid filling machine precision in quantitative liquid filling is controlled and comprised the steps:The first step deposits the relation curve between the buffering frequency of variable-frequency motor in the overshoot percentum of drawn liquid filling machine and liquid filling machine variable frequency hydraulic control system in the control mainboard of liquid filling machine variable frequency hydraulic control system; Selected overshoot percentum in the mainboard of liquid filling machine variable frequency hydraulic control systemSecond step, during liquid filling, inputs preset adding amount V 0, the control mainboard in liquid filling machine control system is according to preset adding amount V 0with selected overshoot percentum according to relation curve, determine corresponding buffering frequency;The 3rd step, controls mainboard according to definite buffering frequency, the rotating speed of variable-frequency motor is controlled, to realize the control to liquid filling machine precision in quantitative liquid filling;Control mainboard in described liquid filling machine control system is according to preset adding amount V 0with selected overshoot percentum according to relation curve, determining that corresponding buffering frequency one of refers to as follows determines: (one) is directly by relation curve corresponding to this preset adding amount and selected overshoot percentum frequency F corresponding to intersection point be defined as cushioning frequency; (2), after determining F by mode (), between 0～F, frequency of random selection is as buffering frequency.
- According to claim 1 for liquid filling amount lower than the measured liquid filling accuracy control method of minimum, it is characterized in that: described liquid filling machine is fuel charger.
- According to claim 2 for liquid filling amount lower than the measured liquid filling accuracy control method of minimum, it is characterized in that: overshoot percentage range selected in the described first step is
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| CN201310008343.8A CN103058119B (en) | 2013-01-09 | 2013-01-09 | Liquid filling accuracy control method for liquid filling quantity smaller than minimum measured quantity |
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|---|---|---|---|
| CN201310008343.8A CN103058119B (en) | 2013-01-09 | 2013-01-09 | Liquid filling accuracy control method for liquid filling quantity smaller than minimum measured quantity |
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| CN103058119B true CN103058119B (en) | 2014-12-03 |
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| CN106949073B (en) * | 2017-03-20 | 2018-09-18 | 佛山市海卓瑞流体控制工程有限公司 | A kind of novel control method along the control method of feedback and its applied to pumping system |
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|---|---|---|---|---|
| CN101885462A (en) * | 2010-06-25 | 2010-11-17 | 托肯恒山科技（广州）有限公司 | Variable frequency hydraulic control system of fuel dispenser and quantitative refueling control method thereof |
| CN201834759U (en) * | 2010-06-25 | 2011-05-18 | 托肯恒山科技（广州）有限公司 | Variable frequency hydraulic control system of fuel dispenser |
| CN102173372A (en) * | 2011-03-04 | 2011-09-07 | 华南理工大学 | Variable-frequency hydraulic control system for fuel dispenser and novel precision control method for quantitative fuel filling thereof |
| CN102464291A (en) * | 2010-11-17 | 2012-05-23 | 北京航天发射技术研究所 | Ground direct and quantitative filling system and method |
| CN202390193U (en) * | 2011-12-21 | 2012-08-22 | 华南理工大学 | Temperature controllable metering control system of variable frequency oiling machine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3005723B2 (en) * | 1990-12-14 | 2000-02-07 | トキコ株式会社 | Metering liquid supply control device |
| JP3203621B2 (en) * | 1991-11-12 | 2001-08-27 | 株式会社タツノ・メカトロニクス | Refueling device |
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2013
- 2013-01-09 CN CN201310008343.8A patent/CN103058119B/en not_active Expired - Fee Related
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| CN101885462A (en) * | 2010-06-25 | 2010-11-17 | 托肯恒山科技（广州）有限公司 | Variable frequency hydraulic control system of fuel dispenser and quantitative refueling control method thereof |
| CN201834759U (en) * | 2010-06-25 | 2011-05-18 | 托肯恒山科技（广州）有限公司 | Variable frequency hydraulic control system of fuel dispenser |
| CN102464291A (en) * | 2010-11-17 | 2012-05-23 | 北京航天发射技术研究所 | Ground direct and quantitative filling system and method |
| CN102173372A (en) * | 2011-03-04 | 2011-09-07 | 华南理工大学 | Variable-frequency hydraulic control system for fuel dispenser and novel precision control method for quantitative fuel filling thereof |
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