CN1030734C - Oil quantity indicator for cylindrical gasoline tank installed horizontally - Google Patents
Oil quantity indicator for cylindrical gasoline tank installed horizontally Download PDFInfo
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- CN1030734C CN1030734C CN 85109432 CN85109432A CN1030734C CN 1030734 C CN1030734 C CN 1030734C CN 85109432 CN85109432 CN 85109432 CN 85109432 A CN85109432 A CN 85109432A CN 1030734 C CN1030734 C CN 1030734C
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- Prior art keywords
- signal
- liquid level
- buoy
- output
- sensing device
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Abstract
The present invention relates to an oil quantity indicator which is horizontally arranged on a cylindrical oil tank. After the liquid level position of the gasoline in the horizontally arranged cylindrical oil tank is detected, the liquid level position is converted into an electrical signal representing the level position, and a piecewise function is used for further converting the electrical signal into an electrical signal representing oil quantity. The electrical signal representing the oil quantity can display the oil quantity by a photoelectric code, so that the oil quantity in the oil tank can be exactly displayed in a digital form.
Description
About being installed in the oil mass indication in the underground gasoline cistern in refuelling station, adopted the way of various samples, this depends on the shape of gasoline cistern.
For example, the rectangular parallelepiped gasoline cistern, its oil mass can be recognized easily by the position of detecting liquid level in the oil tank.This method is equally applicable to the vertical cylindrical gasoline cistern of placing.
Yet, under the situation that adopts the cylindrical gasoline cistern of horizontal,, also being difficult for understanding the oil mass in the gasoline cistern even known the liquid level position of gasoline, have only the piecewise function of utilization table to calculate this moment.
The present invention is intended to overcome above-mentioned shortcoming, and its objective is provides a kind of oil quantity indicator that is used for the cylindrical gasoline cistern of level installation.
For reaching this purpose, according to principle of the present invention, the liquid level position of gasoline and convert thereof into the electric signal of gasoline level in the expression gasoline cistern in the cylindrical gasoline cistern that the level that detects is installed, by means of piecewise function, again this electrical signal conversion is become the electric signal of expression oil mass, this signal utilizes photoelectric digital to show oil mass, and like this, the oil mass in the gasoline cistern has just accurately showed with the form of numeral.
Fig. 1 is the circuit block diagram of the oil quantity indicator of the first embodiment of the present invention.
Fig. 2 represents the relation between piecewise function and the broken line, is used for the linear change non-linearization with simulating signal, shows oil mass is carried out numeral.
Fig. 3 represents to remove the circuit diagram of N counter circuit.
Fig. 4 is the circuit block diagram of the oil quantity indicator of the second embodiment of the present invention.
Fig. 5 represents a buoy, and it can be effectively used to the oil mass indication of the foregoing description.
Fig. 6 is the enlarged drawing of above-mentioned buoy.
Fig. 7 is the sectional view along the I-I line among Fig. 6.
Fig. 8 is the above-mentioned buoy that has amplified of expression, but is installed among the pipe B.
Main point of the present invention is to adopt piecewise function, horizontal The oil mass of gasoline cistern can show with photoelectric digital.
Below in conjunction with instantiation, the present invention is done detailed description.Fig. 1 is the circuit block diagram of the oil quantity indicator of the first embodiment of the present invention.
With reference to accompanying drawing, numeral 1 is represented the cylindrical gasoline cistern of horizontal, and wherein buoy 2 swims on the gasoline surface.Numeral 3 expression signal generation branches, the rising and the decline of the buoy 2 that interior dress analog signal generator such as potentiometer, this signal generator cause according to the variation of gasoline level position produce simulating signal.Numeral 4 representative voltage conversion of signals parts.Numeral 5 is represented a reometer, is used for common liquid level and shows.Fig. 6 is an input amplifier, and input signal is amplified about five trainings, and gives integrator 8 signal that has amplified by switch 7.
Numeral 10 is represented null detector, and numeral 11 is represented clock-signal generator, and numeral 12 is represented reference count, digital 13 representation switch control circuits.
Under the situation of using the cube gasoline cistern, must change linear change into, at this moment, switch 14 works to cut off any non-linear circuit.Numeral 15 is represented the non-linear conversion circuit.Numeral 16 is represented indication counter.
Below describe the working condition of circuit, in this circuit, come the analog input signal of automatic signal generator 3 to be converted to the digital DC electric current, carry out non-linear conversion then.
The liquid level position of cylindrical gasoline cistern 1 is detected by the rising and the decline of buoy 2, says in some sense, and buoy 2 is equivalent to level sensor 2, and signal generation divides 3 to produce and the rising of buoy 2 and the corresponding simulation electric signal that descends.Input amplifier 6 is added with analog input signal at its input end, and it amplifies about five times with signal.The signal that has amplified is added on the integrator 8 by switch 7.
The unknown voltage Vx that amplifier 6 provides adds to integrator 8 by switch 7, at a preset time T
1In carry out integration or fair.Subsequently, the signal controlling sent by ON-OFF control circuit 13 of switch 7 turns to.In this case, reference voltage Vs adds to integrator 8, carries out reverse integral or discharge.Whether detect discharge process by null detector 10 finishes.If T
2Represent the time of reverse integral, following formula is represented T integral time
1, T
2And the relation between voltage Vx, the Vs, T
1/ T
2=Vs/Vx.Therefore, if known T
1, T
2And Vs, just can calculate Vx.Preestablish circuit structure, make when being input as 1V (1000mv), because the effect of reference voltage, 1000 count pulse correspondences 100.0%, 1000 count pulses (corresponding 100.0%) corresponding voltage Vs. for example supposes that charging voltage is Vx, duration of charging is the time of 1000 count pulses, and reverse charging subsequently (discharge) voltage is reference voltage Vs, finishes (zero is detected) through 500 count pulses chargings.So,
T
1=1000 count pulses, T
2=500 count pulses,
Vs＝100.0％。According to above-mentioned formula, obtain
Vx＝(500/1000)×100％＝100％/2＝50％。
Because the duration of charging T of input voltage determines by a series of like this processes, so receive 1000 during from pulse that clock oscillator 11 sends when reference count 12, a signal is added to ON-OFF control circuit 13, makes switch 7 get to position a from position b.
After detected zero-signal added to ON-OFF control circuit 13 when reverse charging finishes, switch 7 was got to position b from position a again, repeated the same course of work.
Use this formula, realized mould/number conversion.
In order to obtain the approximate broken line along the piecewise function curve, the number that non-linear conversion circuit 15 is remembered according to reference count changes the impulse ratio that is input to indication counter 16.
The number that on behalf of reference count, the symbol fo among Fig. 2 remember, symbol f
1-f
3The approximate broken line that representative is obtained by the ratio that changes the input pulse number along the piecewise function curve.
For example, the number of being remembered when reference count 12 is 0～100, the pulse that gives indication counter 16 be reference count 12 the input pulse number 5.2%, thereby, obtain the approximate broken line of piecewise function curve.
Be based on the reverse charging time T of reference voltage owing to show required numerical value
2So umber of pulse during this time is only at T
2Count the input counting of device 16 during this time by switch 17 control indication juice.
Each is all provided the output of indication counter 16 by time-sharing system, and delivers to digital indicator driving circuit 18.Digital indicator driving circuit 18 has two circuit, and one of them outside is connected to joint 19, in order to driving an independently display of display box is arranged.Numeral 20 is represented a digital indicator.
Relevant with power supply capacity, circuit structure is done such arrangement, and promptly when connecting outside demonstration joint, all internal display quit work.
Alarm count device 21 receives and display counter 16 same number of input pulses.When detecting higher limit or lower limit, upper limit sensor circuit 22 or lower limited sensor circuit 23 are just lighted alarm 24.In addition, make upper limit alarm contactor 27 or 28 actions of lower limit warning contactor by relay road 25.
Alarm disengage button of numeral 26 expressions.
As mentioned above, the main point of present embodiment is to adopt piecewise function, with the linear change non-linearization of analog input amount, thinks the usefulness of numeral demonstration.It is such making the nonlinearized principle of linear change, the frequency that is the count pulse of indication counter 16 changes according to the accumulative total of reference count 12 is digital, 12 pairs of time clock that produced by clock oscillator 11 of reference count are carried out linear counting, have therefore changed the counting ratio of display counter 16.Among the present invention, as present embodiment is pointed out, be equipped with single clock oscillator, employing can be preset except that the N counter and be carried out equivalent frequency conversion, and the counting system that removes the N counter can be changed by the predetermined input that adds.
Here, the straight slope in allowed band can obtain according to the curve calculation of piecewise function.Among the present invention, the variation of frequency is divided into three sections f
1To f
3(with reference to 2).In this case, given pre-input makes that presettable counter can be by decade counter work when the slope of the line among Fig. 2 is 1 (y=x).When reference count when 0-100 scope counting (liquid level is the 0-100 millimeter), with reference to the sectional area table, be 5.2% at 100 millimeters place's capacity, therefore, slope is 5.2/100.
Therefore, the cycle of pulse is 5.2/100, and promptly frequency is f
1=100/5.2=19.So presettable counter becomes the non-decimal counter, similarly, at f
2During=100/100=1, it becomes decade counter, at f
3During=400/496=0.8, it becomes the octal representation device.
The critical piece that removes the N counter circuit is two BCD (BCD coding) counter 30 and two 4 bit digital comparers 31 (with reference to Fig. 3).In this circuit, will import in advance in advance and be decided to be f
1=19.When the count value of BCD counter becomes 19, comparer output A=B.This signal makes BCD counter 30 reset as the counting input pulse of display counter 16 simultaneously.So corresponding 19 clock input pulses provide a pulse, this process repeats always, till reference count 12 is fallen into a trap to 100.
This principle is equally applicable to frequency f
2And f
3
According to present embodiment, the variation by liquid level position in the cylindrical gasoline cistern 1 of horizontal can demonstrate the variation of oil mass in the jar with numeral, oil mass etc. during its meaning is to grasp jar with the form of numeral.
Second embodiment is characterised in that the scrambler by being contained in the liquid surface sensing device detects liquid level variation in the oil tank.
Fig. 4 is the circuit block diagram of the oil quantity indicator of the second embodiment of the present invention.
Numeral 40 is represented a sensor device among the figure, and it comprises a scrambler, and this scrambler is according to the rising or the decline work that swim in the lip-deep buoy of gasoline in the horizontal oil tank 1, thereby generation shows the digital signal of liquid level position.
As for other parts in the circuit block diagram, numeral 44 is represented a printing equipment, and numeral 45 is represented a liquid level position lock-in circuit, and numeral 46 is represented a warning circuit, point out that the liquid level position in the oil tank 1 is in abnomal condition, numeral 47 is represented a remote indicator circuit.
Owing to adopt a kind of like this circuit structure, so the variation of liquid level position at first becomes the digital signal that is produced by scrambler, this digital signal is directly passed to CPU42, the digital signal transition of expression liquid level position is the digital signal of expression oil mass in CPU42, the digital signal of this expression oil mass is passed to digital indicator 43 again, utilize photoelectric digital, this display shows the real-time oil mass in the oil tank 1.
According to this embodiment, can save the mould/number conversion circuit that adopts among first embodiment, so reduced erected cost.
In above-mentioned oil quantity indicator, float over the buoy on the liquid level in the oil tank 1 and in the process of accurately measuring oil mass, play important effect.
Fig. 5 to Fig. 8 shows a buoy, and it can make above-mentioned oil quantity indicator accurately measure oil mass in the oil tank.
Among Fig. 5, numeral 48 is represented the underground petrol tank of refuelling station, and numeral 49 is represented refuelling station's ground location, and numeral 50 representatives are installed in the pipeline of oil tank 48 upper walls, and A represents a liquid surface sensing device.
This sensing device A comprises shell 51, utilizes line 56 suspended weight 53 from the roller 52, utilizes belt 57 suspended buoy 55 from the roller 54.
Sensing device A is equipped with scrambler, and it produces the digital signal of an expression liquid level position, and this signal is passed to CPU42, will represent the digital signal of the digital signal transition of liquid level position for the expression oil mass.This scrambler links to each other with roller 54.
Buoy 55 is slightly heavier than weight 53, and like this, when the oil mass increase in the oil tank 48 causes liquid level to rise; buoy 55 also rises, so make roller 54 rotations, in addition; when the oil mass in the oil tank 48 reduces when causing liquid level decline, buoy 55 also descends, so make roller 54 opposite spins.
According to the rotation of roller 54, scrambler will represent that the digital signal of liquid level position sends CPU42 to.
As shown in Figure 6, buoy 55 is the slender hollow bodies with circular section, and lead-frame 58 is fixed on the side of buoy 55 middle part outer walls.
The axis pitch angle at 45 of lead-frame 58 and buoy 55, and be rectangle, constituting a conduction band space, conduction band 59 passes this space.
In other words, as shown in Figure 8, the upper end of conduction band 59 is fixed on any suitable place of sensing device, for example be clipped in the spacer flanger dish 61 between the ring flange 6 of the base 60 of sensing device and pipeline 50, this conduction band 59 passes pipeline 50 and extends downwards, there is a weight 62 lower end, and this weight is placed on the inner bottom surface of oil tank 48 lightly.
In addition, conduction band 59 is made by the material as sheet steel and so on, can be enough to stop the twisting of conduction band.Conduction band 59 also has many apertures, to reduce the resistance that gasoline flows.
Because a kind of like this structure, lead-frame 58 can prevent to cause the rotation of the buoy 55 of buoy band 57 twistings, like this.Sensing device A and scrambler can accurately detect the liquid level position of the gasoline in the jar 48.
Claims (4)
1. telltale that is used for the cylindrical tank that level installs,
Comprise:
A. swim in the elongated buoy on the liquid level in described jar;
B. sensing device, it by detecting elongated buoy in described jar rising and reduce and measure liquid level in the jar, and produce the output signal of indication liquid level;
C. function generator connects into the output signal that receives described sensing device, and provide with represent jar in the corresponding digital signal of function that is similar to of the straight segments that concerns between the liquid level position of liquid measure;
D. numeric display unit is used for the value that the digital described digital signal that shows that described function generator sends is represented; It is characterized by described buoy comprises:
I. the buoy body that forms by an elongated low-weight objects;
Ii. lead-frame, it is installed on the side of periphery wall of described buoy body, and described lead-frame is a rectangle, with respect to buoy axis tilt miter angle, and constitutes the space that can pass elongated band between the periphery wall of described buoy body;
Iii. conduction band, have abundant hardness and pass the space and vertical the extension by the described elongated conduction band that in described jar, passes described lead-frame, the upper end of described conduction band is connected with the base of described sensing device, thereby its lower end has a weight to increase the flintiness of above-mentioned conduction band to strengthen conduction band, described conduction band has elongated and flat transversal section, and extend along the direction of the longitudinal axis that is parallel to described cylindrical tank, so that make described elongated buoy consistent with the direction of the longitudinal axis that is parallel to described cylindrical tank.
2. according to the telltale of claim 1, wherein said sensing device produces a simulating signal, described function generator comprises A/D converter, this A/D converter comprises: integrator, be used to connect the input end of integrator so that receive the switch of the simulating signal and the reference signal of sensing device selectively, clock oscillator, link with this clock oscillator and when reaching preset count, to control the reference count that this switch is selected reference signal, and link with the output of integrator and when integrator is output as zero, to control the null detector that this switch is selected the sensing device signal, and described function generator also comprises the non-linear number/number conversion circuit that links with described clock oscillator, be used for producing output pulse signal corresponding to the approximate broken line of the piecewise function curve of making according to the oil mass in the horizontal cylindrical tank and liquid level position relation according to time clock, and link with the output terminal of non-linear conversion circuit, described output signal can be passed to the digital counter of described numeric display unit.
3. according to the telltale of claim 2, wherein variable division circuit comprises reducible fixedly divider and the comparer of selecting signal to compare in order to the divisor that the output and the counter of fixing divider comes, comparer output links with the fixing input that resets of divider, and forms the output of variable division circuit.
4. according to the telltale of claim 1, described sensing device comprises the scrambler that produces the digital signal of liquid level position in the described oil tank of indication, described function generator is a CPU, this CPU comprises: the approximate broken line of the piecewise function curve of making according to the oil mass in the horizontal cylindrical tank and liquid level relation, the digital signal of liquid level position in this oil tank of described indication is converted to the non-linear number/number conversion circuit of the digital signal of oil mass in this oil tank of indication, and link with the output terminal of non-linear conversion circuit, said output signal can be passed to the counter of described numeric display unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85109432 CN1030734C (en) | 1985-12-30 | 1985-12-30 | Oil quantity indicator for cylindrical gasoline tank installed horizontally |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85109432 CN1030734C (en) | 1985-12-30 | 1985-12-30 | Oil quantity indicator for cylindrical gasoline tank installed horizontally |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85109432A CN85109432A (en) | 1987-07-08 |
| CN1030734C true CN1030734C (en) | 1996-01-17 |
Family
ID=4796326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85109432 Expired - Lifetime CN1030734C (en) | 1985-12-30 | 1985-12-30 | Oil quantity indicator for cylindrical gasoline tank installed horizontally |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1030734C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101100263B (en) * | 2006-07-07 | 2011-02-09 | 东芝电梯株式会社 | Assistant brake control device and method for passenger conveyer |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100334434C (en) * | 2005-09-16 | 2007-08-29 | 杨容涛 | Digital method for measuring quantity of fuel oil in fuel tank of motor vehicle, and metering device |
| US8234084B2 (en) * | 2009-03-17 | 2012-07-31 | Enraf B.V. | Apparatus and method for automatic gauge reading in an inventory control and management system |
-
1985
- 1985-12-30 CN CN 85109432 patent/CN1030734C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101100263B (en) * | 2006-07-07 | 2011-02-09 | 东芝电梯株式会社 | Assistant brake control device and method for passenger conveyer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85109432A (en) | 1987-07-08 |
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| RJ01 | Rejection of invention patent application after publication | ||
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