JP2007153365A - Measuring apparatus and measuring method for tanker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measuring apparatus capable of highly accurate measurement regardless of the inclination of a stopping position of a tanker, and to provide its measuring method. <P>SOLUTION: The measuring apparatus includes: liquid surface measuring means (22, 23) for measuring the levels of the surfaces of liquids loaded in corresponding hatches (21), a lengthwise inclination measuring means (24) for measuring the lengthwise inclination of the vehicle, a widthwise inclination measuring means (25) for measuring the widthwise inclination of the vehicle, and a measuring control means (control unit 10). An amount of oil loaded in each hatch (21) is measured from the measurement result of the liquid surface measuring means (23) and the measurement results of the lengthwise inclination measuring means (24) and widthwise inclination measuring means (25). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an oil amount measuring device and an oil amount measuring method for a tank truck having a plurality of hatches that are formed in an elliptical shape whose cross section perpendicular to the axle direction is uniform.

Oil level control in each tank lorry hatch (hatch) was generally measured individually with a measuring rod appropriately stamped. It is desirable to install the measuring rod mounting position (measurement position) at the center of the hatch which is not easily affected by the inclination of the tank truck itself.
However, since the unloading hatch is provided in the center of the hatch, the mounting position of the measuring rod must be a position away from the center. When the measuring rod is installed at a position away from the center, if the road surface on which the tank lorry stops is inclined, the oil level in the hatch is also inclined with respect to the horizontal plane under the influence of the inclination of the road surface. Therefore, the amount of oil is not accurately measured.

  In recent years, when transporting fuel from an oil tank station to a gas station, it has been required to improve the efficiency of transportation using a tank truck. As part of this, not only is the oil stored in each hatch (hatch) of a tank truck all wholesaled at a single gas station, but the tank truck can be used once for each tank truck by carrying out separate unloading (so-called shawari unloading). There may be unloading to multiple gas stations during transportation.

Fuel oil is often transported at night when traffic volume is low, and in such cases, unloading is performed in the absence of workers at the gas station.
Here, in the conventional measuring method using a measuring rod, an operator must climb up the upper part of the tank lorry, and such work is extremely dangerous work at night. Therefore, it has been desired to measure the liquid level without using a measuring bar.
In response to such a request, various level sensors or liquid level gauges (oil level gauges) may be applied.

When applying such various level sensors or level gauges (oil level gauges), whether or not the specified quantity (unloading quantity) has actually been unloaded is determined by It can be grasped by the difference between the data output from the oil level gauge and the above-described oil level gauge on the tank truck side (measured at the oil tank station).
However, even when an oil level gauge or the like is provided for each hatch of the tank truck, the tank truck does not always stop in a horizontal state. In particular, in the gas station, the position of the underground tank, that is, the stop position of the tank truck is often not flat. When the tank lorry is stopped at such an inclined location, the amount of oil in the hatch cannot be obtained directly from the data from the oil level gauge or the like, which causes a problem in the reliability of the scale unloading.

As another conventional technique, a wireless device that transmits gas station information to the tank truck and receives unloading information of the tank truck is provided at the gas station, and a radio device that transmits unloading information and receives the gas station information is provided in the tank truck. A technique has been proposed (see Patent Document 1).
However, the technique is intended to facilitate unloading work from a tank truck and does not solve the above-described problem.
JP 2002-362699 A

  The present invention has been proposed in view of the above-described problems of the prior art, and is capable of accurately measuring the amount of oil in the hatch in the tank truck even when the stop position of the tank truck is inclined. The object is to provide a device and a weighing method.

  The oil amount measuring device for a tank truck according to the present invention is a measuring device (for the oil amount in the hatch 21) of the tank truck (1) having an elliptical hatch (21) having a uniform cross section perpendicular to the axle direction. 21) Liquid level measuring means (22, 23) for measuring the liquid level (the liquid level or the level of the oil stored in the hatch 21) in (the oil stored in), and the inclination in the longitudinal direction of the vehicle A front / rear inclination measuring means (24) for measuring (angle Ψ), a right / left inclination measuring means (25) for measuring a right / left inclination (angle Φ) of the vehicle, and a weighing control means (control units 10, 10A). The measurement control means (10, 10A) includes a liquid level measured by the liquid level measurement means (22, 23), a front / rear inclination angle (Ψ) measured by the front / rear inclination measurement means (24), Left measured by left / right tilt measuring means (25) Based on the inclination angle ([Phi), it is characterized by being configured so as to determine the quantity of oil loaded in the hatch (21) (claim 1).

  The metering control means (control unit 10) includes a minute section dividing means (11), a minute section oil amount calculating means (12), and a hatch oil amount calculating means (13). 11) is configured to perform arithmetic processing to divide the hatch (21) into minute sections having a uniform elliptical cross section and extending by a minute dimension (dZ) in the front-rear direction (tank axle direction). The minute section oil amount calculation means (12) includes the liquid level measured by the liquid level measurement means (22, 23), the front / rear inclination angle (Ψ) measured by the front / rear inclination measurement means (24), Based on the left / right inclination angle (Φ) measured by the right / left inclination measuring means (25), the area of the portion filled with oil is calculated for each minute section, and the area is multiplied by a minute thickness (dZ). It is configured to calculate the minute oil quantity. Preferably, the hatch oil amount calculating means (13) is configured to calculate the hatch oil amount by integrating the calculated oil amounts of the respective minute sections (claim 2).

  Alternatively, the measurement control means (control unit 10A) includes reference capacity calculation means (11), hatch oil amount calculation means (13A), and storage means (19), and the storage means (19) The front-rear inclination angle (Ψ) measured by the inclination measurement means (24) and the front-rear inclination correction coefficient determined according to the liquid level measured by the liquid level measurement means (22, 23), and the left-right inclination measurement means ( 25) and the left / right inclination angle (Φ) measured by the liquid level measuring means (22, 23) measured by the liquid level measuring means (22, 23). The capacity calculating means (11) is configured to calculate the oil amount (reference capacity) in the hatch when there is no inclination from the liquid level measured by the liquid level measuring means, and the hatch oil amount calculating means (13A) is the inclination It is preferable that the amount of oil in the hatch (21) is calculated by multiplying the amount of oil (reference capacity) in the hatch in the case where there is no oil by the front / rear inclination correction coefficient and the left / right inclination correction coefficient ( Claim 3).

  The method for measuring the amount of oil in a tank lorry according to the present invention includes a step (S2) of measuring a liquid level (liquid level) in the measuring method using the measuring device of the tank lorry (1) according to any one of claims 1 and 2. The step (S4) of measuring the front / rear tilt angle (Ψ) and the left / right tilt angle (Φ), the measured liquid level (liquid level), the measured front / rear tilt angle (Ψ), and the left / right tilt angle (Φ). And a step (S5, S6) of calculating the amount of oil stored in the hatch (21).

  The method for measuring the amount of oil in a tank lorry according to the present invention includes a step (S12) of measuring a liquid level in the measuring method using the measuring device of the tank lorry (1) according to any one of claims 1 and 3, and the liquid level. A step (S13) of calculating the oil amount (reference capacity) in the hatch when there is no inclination from the liquid level measured by the measuring means, and a step of measuring the front-rear inclination angle (Ψ) and the left-right inclination angle (Φ). (S14, S16), the front / rear inclination correction coefficient is determined in accordance with the front / rear inclination angle (Ψ) and the liquid level measured by the liquid level measurement means (22, 23), and measured by the left / right inclination measurement means (25). Step (S15, S17) for determining a right / left inclination correction coefficient corresponding to the measured right / left inclination angle (Φ) and the liquid level measured by the liquid level measuring means (22, 23), and no calculated inclination exists. The amount of oil in the hatch (reference capacity) Rear tilt correction coefficients and the step of multiplying the lateral inclination correction factor for calculating the amount of oil stored in the hatch (21) has a capital (claim 5).

According to the present invention having the above-described configuration and measuring method, the minute oil quantity calculation means (12) includes the liquid level measured by the liquid level measurement means (22, 23) and the forward / backward inclination measurement means (24). The area of the portion filled with oil is calculated for each minute section based on the front / rear inclination angle (Ψ) measured in step S and the left / right inclination angle (Φ) measured by the right / left inclination measuring means (25). The hatched oil amount calculating means (13) integrates the calculated oil amounts of the respective minute sections to calculate the hatched oil amount, which is calculated by multiplying the area by the minute thickness (dZ). Since the amount of oil can be calculated (claims 1, 2 and 4), high-precision measurement can be performed regardless of whether the tank lorry's stop position is inclined.
And since it is not necessary to use a measuring rod like the prior art, in the case of nighttime unloading work, it is not necessary for the worker to climb to the top of the tank truck, and safety is improved.

Alternatively, according to the oil amount measuring device for a tank truck of the present invention, the front / rear inclination correction coefficient is determined corresponding to the front / rear inclination angle (Ψ) and the liquid level measured by the liquid level measuring means (22, 23), The right / left inclination correction coefficient is determined corresponding to the right / left inclination angle (Φ) measured by the inclination measuring means (25) and the liquid level measured by the liquid level measuring means (22, 23), and the calculated inclination exists. The amount of oil stored in the hatch (21) can be calculated by multiplying the amount of oil (reference capacity) in the hatch when not to be multiplied by the front / rear inclination correction coefficient and the left / right inclination correction coefficient (claims 1, 3). Claim 5). And since the forward / backward inclination correction coefficient, the left / right inclination correction coefficient, etc. can be obtained in advance, the measurement control means (control unit 10, 10A) does not perform the integration, but the oil amount of the hatch (21). Weighing is easy and ensures practical accuracy.
Even in this case, there is no need to use a measuring rod, and it is not necessary for the worker to climb up to the top of the tank lorry. Therefore, safety is improved especially during nighttime unloading work.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, an outline of an oil amount measuring device for a tank truck embodying the present invention will be described with reference to FIGS.

In the tank lorry 1, a tank 2 having four hatches (oil tanks) 21 is mounted in the illustrated example.
A liquid level gauge (oil level gauge) 22 is provided at the upper end portion (the upper part of the hatch) of each hatch 21, and a liquid level sensor (oil level sensor) 23 extends vertically downward from the liquid level gauge 22 within the hatch 21. Are arranged so as to extend to the vicinity of the bottom of the hatch 21.

  A cargo handling control device 6 is provided in front of the tank 2, and a control unit (indicated by reference numeral 10 in the first embodiment and 10A in the second embodiment) and a liquid level gauge 22 in the cargo handling control device 6 which will be described later. Are connected by a signal cable 7.

At the bottom of each hatch 21, a delivery port 29 having a valve (not shown) is provided, and each delivery port 29 is connected to one supply pipe Lo.
An oil supply valve V is interposed near the end of the supply pipe Lo opposite to the hatch 21 side.
On the other hand, an underground tank 5 is buried in the underground G of an appropriate area of a gas station (gas station), and the underground tank 5 is connected to an oil inlet 3 on the ground side and an oil pipe Lt.

In FIG. 1, for example, regular gasoline, high-octane gasoline, and kerosene are sequentially loaded from the hatch 21 in front of the vehicle, and the regular gasoline in the tank is unloaded to the underground tank 5 of the gas station. Shall.
The rear end of the tank truck 1 approaches the vicinity of the oil filling port 3, the supply pipe Lo of the tank truck 1 is connected to the oil filling port 3, and the hatch outlet 21 is filled with regular gasoline to be unloaded. A discharge valve (not shown) is opened. Next, the discharge valve V at the rear end of the supply pipe Lo is opened, and regular gasoline in the hatch 21 of the tank truck 1 is supplied (oiled) to the underground tank 5 of the gas station.

Here, if the ground 4 of the unloading place in the filling station is flat as shown in FIG. 1, the indicated value of the oil level sensor 23 can correctly display the unloading amount or the filling amount. However, as described above, depending on the filling station, the ground at the place of loading and unloading may be inclined (4c) as shown in FIG. 2, and in such a case, the numerical value displayed by the liquid level gauge 22 Therefore, it is not possible to correctly grasp the amount of unloading or loading.
1st Embodiment and 2nd Embodiment are comprised so that the amount of unloading or loading can be determined correctly also in such an inclined place.

  In FIG. 1, a front / rear inclination angle sensor 24 that measures the inclination angle of the vehicle in the front / rear direction and a left / right inclination angle sensor 25 that measures the inclination angle of the vehicle in the left / right direction are provided. A signal cable 8 is connected to a control unit (reference numeral 10 (see FIG. 3) in the first embodiment, reference numeral 10A (see FIG. 11) in the second embodiment) in the cargo handling control device 6.

Prior to the description of the metering method of the illustrated embodiment, the principle of oil amount metering in the illustrated embodiment will be described with reference to FIGS.
FIG. 4 is a perspective view of the tank 2 of the tank lorry as seen through the three-dimensionally loaded fuel oil. Here, the tank 2 has a hatch (not explicitly shown in FIG. 4), and the hatch has a cross-sectional shape orthogonal to the front-rear direction (axle direction) of the tank 2 and is configured in a uniform elliptical shape. ing. Although not clearly shown in FIG. 4, the tank 2 is provided with a plurality of hatches (four sections in the drawing: see FIGS. 1 and 2).
FIG. 5 shows a cross section of the hatch 21 perpendicular to the front-rear direction (axle direction) of the tank 2 when there is no inclination in the left-right direction. That is, FIG. 5 is a cross-sectional view of the elliptical hatch 21 in a state in which fuel oil is loaded with a gap left above (the liquid level is indicated by a line L) as viewed from the front.

In FIG. 5, an ellipse centered on the origin o of the X axis and the Y axis, the length of the major axis (1/2 of the major axis) is a, and the length of the minor axis (1/2 of the minor axis) is b. It is assumed that the fuel oil is loaded up to the line L (liquid level line) in the hatch 21 having the shape cross section.
Here, the intersections of the liquid surface line L and the ellipse are c and −c, the X and Y coordinates of the intersection c are X ₁ and Y ₁ , and the X and Y coordinates of the intersection −c are X ₂ and Y ₂ . To do. The angle formed by the X axis and the line segment oc is represented by θ, and the intersection of the perpendicular from the intersection c to the Y axis and the Y axis is represented by d.
In addition, the symbols of both ends of the long diameter (elliptical X-axis coordinates) are also indicated by a and -a, and the symbols of both ends of the short diameter (elliptical Y-axis coordinates) are also indicated by b and -b.

This ellipse equation is expressed by Equation 1.
(X ² / a ² ) + (Y ² / b ² ) = 1 (Formula 1)
The area S of the fuel oil loading portion at this time, that is, the area S of the region below the liquid level line L in the ellipse of FIG. 5, is the area of the lower half of the ellipse (area πab / 2 of the ellipse half). And twice the area of the triangle ocd (2 × (X1 · Y1 / 2) = X1 · Y1) and twice the area of the sector oca (the area of the sector oca is described below with reference to FIG. It is expressed as a total value of (explain). That is, the area S is S = “the area of the lower half of the ellipse” + 2 × Δocd (= X1 · Y1) + 2 × sector-shaped oca.
It is expressed by the following formula.

FIG. 6 is a drawing in which a circle with a radius b is superimposed on the ellipse of FIG. Let e be the intersection of the line L and the circle of radius b, and f be the intersection of the circle of radius b and the X axis.
As is well known, the area of a sector oef in a circle is obtained as follows.
Area of sector oef = πb ² × sin ⁻¹ (d / b) / 2π
= B ² × sin ⁻¹ (d / b) / 2 (Formula 2)
Here, “sin ⁻¹ (d / b)” is the central angle of the fan-shaped oef.

As is also well known, the area of the sector oca in the ellipse is shown as the area of the sector oef in the circle multiplied by the ratio of the major axis and the minor axis, that is, a / b.
Therefore, the area of the fan-shaped oc = ab × sin ⁻¹ (d / b) / 2 (Formula 3)
If this equation 3 is substituted into the above-described equation for determining the area S, the area S of the fuel oil loading portion when there is no inclination in the left-right direction is
S = πab / 2 + X1 · Y1 + absin ⁻¹ (d / b)
Represented as:

Next, a description will be given of a method for obtaining the area S of the loaded portion of the fuel oil when an inclination (inclination angle = Φ) occurs in the left-right direction as shown in FIG.
The intersection of the X axis and the ellipse (the same ellipse shown in FIG. 7) is a (right side of FIG. 7), j (the left side of FIG. 7), and the intersection of the Y axis and the ellipse is b (only shown in the upper part of FIG. 7). The intersection of the liquid level line L and the ellipse is c (right side of FIG. 7: coordinates X ₁ , Y ₁ ), f (left side of FIG. 7: coordinates are X ₂ , Y ₂ ), the liquid level line L and the Y axis Let d be the intersection point (the liquid level measured by the liquid level sensor).
Further, let g be the intersection of the perpendicular line from the point c to the Y axis and the Y axis, and h be the intersection point of the perpendicular line from the point f to the Y axis and the Y axis.
Note that X ₁ = | cg |, Y ₁ = | og |, and X ₂ = | fh | and Y ₂ = | oh |.

An angle formed by points a, o, and c is θ1, and an angle formed by points j, o, and f is θ2.
In this case, the angle constituted by the d point, the c point, and the g point, and the angle constituted by the d point, the f point, and the h point are all equal to the inclination angle Φ.

The area filled with the fuel oil shown in FIG. 7 (the area of the region below the liquid level L in the ellipse in FIG. 7) S is obtained by the following equation 4.
S = area of lower half of ellipse (s1) + area of Δocd (s2) + area of Δofd (s3) + area of fan-shaped oca (s4) + area of fan-shaped ofj (s5) (Formula 4)

here,
The area s1 of the lower half of the ellipse is s1 = πab / 2.
The area s2 of Δocd is represented by s2 = d · X _1/2 .
Similarly, the area s3 of Δofd is expressed by _{s3 = d · X 2/2} .
The area of the sector can be obtained by integration because θ1 and θ2 are θ1 = tan ⁻¹ (Y ₁ / X ₁ ) and θ2 = tan ⁻¹ (Y ₂ / X ₂ ). As described above in (Expression 2) and (Expression 3), the fan-shaped area b ² sin ⁻¹ (Y ₁ / b) / 2 of a circle having a radius b may be multiplied by a / b.

That is, for example, the area of the fan-shaped oca is represented by absin ⁻¹ (Y ₁ / b) / 2.
Substituting this like in (Equation 4), (Equation 4) is _{S = πab / 2 + d ·} X 1/2 + d · X 2/2 + absin -1 (Y 1 / b) / 2 + absin -1 (Y 2 / b ) / 2 (Formula 4 ')

Here, if the liquid level line L is expressed as a primary expression related to the X axis and the Y axis, it is expressed as the following Expression 5.
Y = tanΦ · X + d (Formula 5)
Also reprinted the ellipse formula,
(X ² / a ² ) + (Y ² / b ² ) = 1 (Formula 1)
The simultaneous equations of Equation 1 and Equation 2 are solved, and the two solutions at that time are given as the coordinates (X ₁ , Y ₁ ) and (X ₂ , Y ₂ ) of the intersection c and the intersection f. With such a solution, X ₁ , Y ₁ , X ₂ , Y ₂ are expressed by a, b, d, and Φ.

  If this solution is substituted into (Expression 4 ′), (Expression 4 ′) is expressed by a, b, d, and Φ. Here, since the major axis a and the minor axis b of the ellipse are fixed values, (Equation 4 ′) can be expressed by d and Φ. By substituting the indicated value d of the liquid level sensor 23 and the measured value Φ of the left / right tilt sensor 24 into such an expression (expression expressing the expression 4 ′ as d and Φ), the above-described area S (in FIG. 7) , The area below the oil level L: the area occupied by the fuel oil).

The tank truck 1 not only tilts left and right, but also tilts in the longitudinal direction of the vehicle as shown in FIG. FIG. 8 is a perspective view of the hatch 21 seen from the side of the vehicle when the vehicle is inclined in the longitudinal direction (axle direction) of the vehicle.
8, for example, assuming that the liquid level sensor 23 is in the center in the front-rear direction of the hatch 21, the Z-axis (horizontal axis) is the center in the vertical direction of the hatch 21, and the center in the front-rear direction is A coordinate system having a Y axis in the (direction) is shown tilted by an inclination angle Ψ in the front-rear direction.

  Assuming that the length of the hatch 21 (in the front-rear direction) is Lt, the volume of fuel oil loaded on the hatch 21 is divided into minute sections having a minute width indicated by dZ in the figure, and the total length Lt of the hatch 21 It is obtained by integrating the oil quantity of the minute section over the period. The area S of the loaded oil in the minute section dZ at this time is obtained by the method described above (see Equation 4 ′), and the oil amount of the minute width can be obtained by multiplying the area S by the minute width dZ.

However, for example, in an arbitrary minute section dZn whose Z-axis direction distance is separated by Zn from the liquid level sensor 23, when the indicated value of the oil level sensor 23 is “d”, the oil level dn in the minute section dZn is It is obtained by the following formula 6.
dn = d + Zn · tanΨ (Formula 6)
Accordingly, the oil amount V loaded on the hatch 21 is obtained by the following equation 7 where S is the area of the minute section.
V = ∫S (d) · dZ (Formula 7)

  Equation 7 is expressed in the form of an indefinite integral, which is to reduce the complexity of displaying Equation 7. Actually, Expression 7 is expressed as a definite integral expression in which the integration region is −Lt / 2 to Lt / 2. In Expression 7, the display “S (d)” indicates that the area S can be expressed as a function of the value indicated by the oil level sensor 23 (see Expression 4 ′).

Here, in the illustrated embodiment, a dedicated tilt sensor is provided. However, even without a dedicated tilt sensor, the tilt angles Φ and Ψ can be determined by the configuration described below. .
For example, when measuring the tilt angle Φ in the left-right direction, instead of providing a dedicated tilt sensor, a liquid level sensor 23A arranged offset by a distance W from the center line CL is provided.

Assuming that the liquid level position on the hatch center line CL is “d”, the liquid level measured by the liquid level sensor 23A is also “d” in a flat place such as an oil tank not shown.
As shown in FIG. 9, at a gas station where the tilt angle in the left-right direction is Φ, the liquid level (liquid level position) measured by the liquid level sensor 23 </ b> A is indicated by a point m, and a perpendicular line dropped from the point m to the center line CL. And the intersection of the center line CL is indicated by a point n. If the distance between the point d and the point n is r, the distance r is the liquid level “d” measured (at the liquid level sensor 23A) in a flat place such as an oil tank station, and a gas station with an inclination angle of Φ. The difference from the liquid level “m” measured at the liquid level sensor 23A is obtained.

On the other hand, as apparent from FIG. 9, since r = WtanΦ, the right / left inclination angle Φ is expressed by the following equation.
Φ = tan ⁻¹ (r / W)
As described above, if the liquid level sensor 23A is provided so as to be offset from the hatch center line CL by the distance W, a dedicated sensor for detecting the tilt angle can be omitted.

Next, with reference to FIG. 3, the detailed structure of the control unit 10 which is a control means in 1st Embodiment is demonstrated.
In FIG. 3, the control unit 10 is composed of a finely divided division block 11, a finely divided oil amount calculation block 12, a hatch oil amount calculation block 13, and a display means 14.

The minute division division block 11 divides the hatch 21 into a minute width (dZ) in the front-rear direction of the vehicle. The number of divisions is arbitrarily set on a case-by-case basis according to the front / rear inclination angle Ψ of the gas station where the tank truck is loaded and unloaded, and other conditions.
The minute section oil amount calculation block 12 receives input signals (measured values of d, Ψ, and Φ) from the liquid level sensor 23 (d), the front and rear inclination sensor 24 (Ψ), and the left and right inclination sensor 25 (Φ), The amount of oil in the minute section is calculated using the above-described equation 4 ′.

The hatch oil amount calculation block 13 calculates the load oil amount of the entire hatch 21 by integrating the oil amount obtained by the calculation in the minute section oil amount calculation block 12 in the axle direction of the tank according to Equation 7.
Although not clearly shown in the figure, such a configuration also includes the case where the oil quantity calculation block 12 and the hatch oil quantity calculation block 13 are integrated according to the above equation 7 to obtain the load oil quantity of the entire hatch 21. To do.

FIG. 10 is a flowchart showing the oil amount measuring method of the first embodiment. Hereinafter, the oil amount measuring method of the first embodiment will be described based on the flowchart of FIG.
First, in step S1, the major axis a (1/2 of the major axis), the minor axis b (1/2 of the minor axis), and the longitudinal dimension Lt of the hatch 21 are input.
In the next step S <b> 2, the control unit 10 divides the hatch 21 by a predetermined number in the front-rear direction (axle direction) of the vehicle (tank truck) 1 in the minute division division block 11.

  In step S3, the measured value (d) of the liquid level (oil level) measured by the liquid level sensor 23 is read. In the next step S4, the measured value (Ψ) of the front / rear tilt angle measured by the front / rear tilt sensor 24 and the measured value (Φ) of the left / right tilt angle measured by the left / right tilt sensor 25 are read.

In step S5, the control unit 10 calculates the oil quantity of the minute section divided and divided in the minute section oil amount calculation block 12 by the above-described calculation method (Equation 4 ′).
Then, in step S6, the hatch oil amount calculation block 13 integrates the minute amount of oil over the entire axial length Lt of the hatch 21 to calculate the total amount of oil loaded in the hatch 21.

Although not clearly shown in the figure, in step S5, the oil amount in the minute section is obtained by multiplying the area S obtained in accordance with the equation 4 'by the minute distance in the front-rear direction of the roll, and the oil amount in the minute section is integrated in step S6. Of course, it is included.
The calculated amount of fuel oil in the hatch 21 is displayed on the monitor 14 as display means (step S7).

In the next step S8, the control unit 10 determines whether or not to end the control. If it is determined that the control is terminated (YES in step S8), the process is terminated as it is, and if the control is continued (NO in step S8), the process returns to step S3, and steps S3 and after are repeated again.
Here, as the determination of the end of the control, for example, the value of the oil amount displayed on the monitor 14 remains a constant value, and there is no fluctuation even after a lapse of a certain time. For example, when a signal indicating that is closed is received.

In the first embodiment, the hatch 21 is divided into minute thickness elements dZ in the front-rear direction (rolley axle direction), the oil amount is calculated for each segment, and the calculated oil amount of each minute segment is It is obtained by integrating over the entire length.
In contrast, in the second embodiment, the amount of oil in the hatch is calculated using an approximation as described below.

In an oil tank station (not shown) in which fuel oil is loaded before being lowered to each gas station (gas station), the loading place of the tank truck is a flat surface without inclination. On the other hand, the inclination of the tank truck stop at each gas station is less than ± 10 ° as a practical range.
If the tilt angles Φ and Ψ are less than 10 °, the oil amount when tilting in the left-right direction and the front-rear direction is an error relative to the oil amount when the lorry is stopped at a flat location (hereinafter, “ The overall error ”is only tilted in the left-right direction and is flat in the front-rear direction (hereinafter referred to as“ inclination error in the left-right direction ”). The result is substantially the same as the result (hereinafter referred to as “multiplication error”) obtained by multiplying the error in the case of being flat in the left-right direction (hereinafter referred to as “tilt error” only). Then, with respect to the overall error, the error of multiplication (“tilt error only in the left and right direction” × “tilt error only in the front and rear direction”) has a difference of less than 0.3%.

Therefore, the relationship between the amount of oil in the hatch (hereinafter referred to as “reference capacity”) on a flat surface without an inclination and the liquid level (oil level) measured by the liquid level sensor 23 is obtained in advance.
Then, from the liquid level measured by the liquid level sensor 23 and the front / rear inclination angle (Ψ), a correction coefficient corresponding to the reference volume at the same liquid level (front / rear inclination correction coefficient: correction of “tilt error in front and rear only”). Coefficient). At the same time, from the liquid level measured by the liquid level sensor 23 and the left / right inclination angle (Φ), the correction coefficient corresponding to the reference volume at the same liquid level (left / right inclination correction coefficient: “right / left inclination error”) Correction coefficient).

Next, the correction coefficient for “tilt error only in front and back” is multiplied by the correction coefficient for “tilt error only in left and right” to obtain a correction coefficient of “multiplication error”. By multiplying the reference capacity by the correction coefficient, an approximate value with sufficient accuracy can be obtained.
According to this method, the man-hours for developing software for performing integration as described in the first embodiment, that is, software for performing complicated processing, can be omitted.
It should be noted that a correction coefficient for the above-described “tilt error only in front and back” and a correction coefficient for the “tilt error only in left and right” can be prepared in advance.

In the second embodiment described with reference to FIG. 11 and FIG. 12, the front / rear inclination correction coefficient corresponding to the liquid level and the front / rear inclination angle (Ψ) (correction coefficient for “tilt error only in front / rear direction”), the liquid level And a right / left tilt correction coefficient corresponding to the left / right tilt angle (Φ) (a correction coefficient for “right and left tilt error”) is an embodiment in which approximately accurate measurement is performed. In other words, the second embodiment is obtained by multiplying the correction coefficient for the above-mentioned reference capacity and the “multiplication error” correction coefficient (the correction error for “tilt error only in the front and rear direction” by the correction coefficient for “inclination error only in the left and right direction”. ) To measure the amount of oil with high accuracy.
In addition, the correction coefficient for the above-mentioned “multiplication error”, the correction coefficient for “tilt error only in front and back”, and the correction coefficient for “tilt error only in left and right” are numerical values obtained in advance by calculation, actual measurement, etc. In this form, the data may be stored in the storage means.

Based on FIG. 11, the detailed structure of 10 A of control units which are the control means of 2nd Embodiment is demonstrated.
The control unit 10A includes a reference capacity calculation block 15, a correction condition determination block 16, a hatch oil amount calculation block 13A, a database 19, and a display means 14.

When it is assumed that the hatch 21 is not tilted back and forth (Ψ) and tilted left and right (Φ), the reference capacity calculation block 15 determines the reference capacity from the liquid level measured by the liquid level sensor 23. It is configured to determine the capacity.
The database 19 includes a table (table) or a map of the above-described front and rear inclination correction coefficients (correction coefficients for “tilt errors only in the front and rear”) and a table of left and right inclination correction coefficients (correction coefficients for “right and left only tilt errors”). (Table) or a map is stored.

The correction condition determination block 16 is based on the front-rear direction inclination angle Ψ measured by the front-rear inclination sensor 24 and the liquid level measured by the liquid level sensor 23, with respect to the aforementioned front-rear inclination correction coefficient ("tilt error only in front-rear direction"). The correction coefficient is determined. At the same time, the correction condition determination block 16 determines the above-described left / right inclination correction coefficient (“inclination of only right / left only” based on the left / right direction inclination angle Φ measured by the left / right inclination sensor 25 and the liquid level measured by the liquid level sensor 23. The correction coefficient for “error” is determined. In addition, the correction condition determination block 16 multiplies the front / rear inclination correction coefficient (correction coefficient for “tilt error only in front / rear”) and the left / right inclination correction coefficient (correction coefficient for “right / left inclination error”) to “multiply It is configured to determine a correction coefficient for “error of error”.
Then, the correction coefficient of “multiplication error” is transmitted to the hatch oil amount calculation block 13A.

  Here, the correction condition determination block 16 determines a front / rear inclination correction coefficient (correction coefficient for “tilt error only in front / rear”) and a left / right inclination correction coefficient (correction coefficient for “right / left inclination error”), Instead of multiplying and determining a correction coefficient of “multiplication error”, the front-rear direction tilt angle Ψ measured by the front-rear tilt sensor 24, and the left-right direction tilt angle Φ measured by the left-right tilt sensor 25. The correction coefficient of the “multiplication error” may be directly determined from the liquid level measured by the liquid level sensor 23 based on a map or the like stored in the database 19.

  The hatch oil amount calculation block 13A calculates (measures) the amount of fuel oil in the hatch 21 by multiplying the reference capacity by the transmitted correction coefficient of “multiplication error”.

Next, an oil amount measuring method of the second embodiment will be described based on the flowchart of FIG.
First, in step S11, the major axis “a” and minor axis “b” of the hatch 21 having an elliptical cross section and the longitudinal dimension Lt of the hatch 21 are input. In the next step S12, the liquid level (oil level) is measured by the liquid level sensor 23. Then, in the next step S13, the oil amount (reference capacity) when it is assumed that there is no inclination is measured using the measured liquid level.

  In step S <b> 14, the left / right tilt angle Φ is measured by the left / right tilt sensor 25. Then, based on the liquid level measured in step S12 and the horizontal tilt angle Φ, the correction condition determination block 16 determines a horizontal tilt correction coefficient and multiplies the reference capacity (step S15).

In step S <b> 16, the front / rear inclination angle Ψ is measured by the front / rear inclination sensor 24. Then, based on the liquid level and the front / rear inclination angle Ψ measured in step S12, the front / rear inclination correction coefficient is determined by the correction condition determination block 16, and the front / rear inclination correction coefficient is multiplied by the value obtained in step S15 (step S17). ). Thereby, in step S17, the oil amount in the hatch is calculated.
The calculated oil amount is displayed on the monitor 14 (step S18).

  In the next step S19, it is determined whether or not to end the control. If it is determined that the control is finished (YES in step S19), the process is finished as it is. If control is to be continued (NO in step S19), the process returns to step S12, and step S12 and subsequent steps are repeated again.

In FIG. 12, the right / left inclination correction coefficient is determined and multiplied by the reference capacity (step S15), and the front / rear inclination correction coefficient is determined and multiplied (step S17). The reference capacity may be multiplied and then the right / left tilt correction coefficient may be determined and multiplied.
Alternatively, the left / right inclination correction coefficient and the front / rear inclination correction coefficient are determined, and both are multiplied to obtain a correction error of “multiplication error”, and the correction capacity is multiplied by the reference capacity to obtain the amount of oil in the hatch. Also good.

  Further, the liquid level is measured in step S12, the left / right inclination angle Φ is measured in step S14, the front / rear inclination angle Ψ is measured in step S16, and then “multiplication” is performed from the liquid level, the left / right inclination angle Φ, and the front / rear inclination angle Ψ. Correction error (correction coefficient obtained by multiplying the left / right inclination correction coefficient and the front / rear inclination correction coefficient) is directly determined, and the determined correction coefficient of “multiplication error” is multiplied by the reference capacity. It is possible to determine the amount of oil inside.

  It should be noted that the illustrated embodiment is merely an example, and does not limit the technical scope of the present invention.

The block diagram which showed the outline | summary structure of embodiment of this invention. The aspect figure which stopped the tank truck of embodiment of this invention on the sloping ground. The block diagram which showed the detailed structure of the control unit of 1st Embodiment of this invention. The perspective view which shows the state which loaded the fuel oil with the predetermined amount in the tank. Explanatory drawing which showed the method of measuring the quantity of the liquid in the container of an erect elliptical cross section. Explanatory drawing for calculating | requiring the area of an elliptical fan-shaped part. Explanatory drawing which showed the method of measuring the quantity of the liquid in the container of the elliptical cross section inclined to right and left. Sectional drawing which looked at the hatch with the front-back inclination for demonstrating the measuring method from the side. The figure which showed another method of measuring the inclination of the left-right direction. The flowchart which showed the measuring method of 1st Embodiment of this invention. The block diagram which showed the detailed structure of the control unit of 1st Embodiment of this invention. The flowchart which showed the measuring method of 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Tank lorry 2 ... Lori tank / tank 3 ... Lubrication port 4 ... Flat surface 4c ... Inclined surface 5 ... Underground tank 6 ... Cargo handling control device 7, 8 ... Signal Cable 10, 10A ... Control means / control unit 21 ... Hatch 22 ... Oil level gauge 23 ... Liquid level sensor 24 ... Front / back inclination measuring means / Front / back inclination sensor 25 ... Left / right inclination measurement Means / Left and right tilt sensor

Claims (5)

  In a tank lorry weighing device having an elliptical hatch with a uniform cross section orthogonal to the axle direction, a liquid level measuring means for measuring the liquid level in the hatch, and a front / rear inclination measuring means for measuring a front / rear inclination of the vehicle, And a right / left inclination measuring means for measuring the right / left inclination of the vehicle, and a measurement control means, the measurement control means being measured by the liquid level measured by the liquid level measurement means and the front / rear inclination measurement means. A metering device configured to determine the amount of oil loaded in a hatch based on a front / rear tilt angle and a left / right tilt angle measured by a left / right tilt measuring means.   The metering control means has a minute section dividing means, a minute section oil amount calculating means, and a hatch oil amount calculating means, and the minute section dividing means has a uniform elliptical cross section and in the front-rear direction. It is configured to perform calculation processing to divide the hatch into minute sections extending only by minute dimensions, and the minute section oil amount calculating means is measured by the liquid level measured by the liquid level measuring means and the front and rear inclination measuring means. Calculate the area of the oil-filled portion for each minute section based on the measured forward / backward tilt angle and the left / right tilt angle measured by the right / left tilt measuring means, and multiply the area by the minute thickness. The metering device according to claim 1, wherein the metering device is configured to calculate an oil amount, and the hatch oil amount calculating means is configured to calculate the hatch oil amount by integrating the calculated oil amount of each minute section. .   The measurement control means includes a reference capacity calculation means, a hatch oil amount calculation means, and a storage means, and the storage means is measured by the front-rear inclination angle and liquid level measurement means measured by the front-rear inclination measurement means. The front / rear inclination correction coefficient determined according to the liquid level, the left / right inclination angle measured by the right / left inclination measurement means, and the left / right inclination correction coefficient determined according to the liquid level measured by the liquid level measurement means. The reference capacity calculating means is configured to calculate the oil amount in the hatch when there is no inclination from the liquid level measured by the liquid level measuring means, and the hatch oil amount 2. The metering device according to claim 1, wherein the calculating means is configured to calculate the oil amount in the hatch by multiplying the oil amount in the hatch when there is no inclination by a front / rear inclination correction coefficient and a left / right inclination correction coefficient. apparatus.   In the measuring method using the tank lorry measuring device according to any one of claims 1 and 2, the step of measuring the liquid level, the step of measuring the front and rear inclination angle and the right and left inclination angle, the measured liquid level, and the measurement And a step of calculating the amount of oil stored in the hatch based on the front-rear inclination angle and the left-right inclination angle.   In the measuring method using the tank lorry measuring device according to any one of claims 1 and 3, the step of measuring the liquid level, and the inside of the hatch when there is no inclination from the liquid level measured by the liquid level measuring means The step of calculating the oil amount, the step of measuring the front and rear inclination angle and the right and left inclination angle, and determining the front and rear inclination correction coefficient corresponding to the liquid level measured by the front and rear inclination angle and the liquid level measuring means, The step of determining the left / right inclination correction coefficient corresponding to the left / right inclination angle measured by the measuring means and the liquid level measured by the liquid level measuring means, and the amount of oil in the hatch when there is no calculated inclination And a step of calculating the amount of oil stored in the hatch by multiplying the inclination correction coefficient and the left / right inclination correction coefficient.

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