JPS61264219A - Method for measuring quantity of liquid in self-running measuring tank - Google Patents

Abstract

PURPOSE:To detect the quantity of a liquid independently of the variation of the liquid surface by standing level gauges in four corners of a self-running measuring tank an reading and operating a maximum value and a minimum value of them when the quantity of the liquid in the tank mounted on an automobile or the other moving body. CONSTITUTION:When the quantity of the liquid stored in a rectangular parallelopiped- shaped or elliptical tank 1 mounted on the automobile or the like is measured, level gaufes 3a-3d are stuck vertically to four corners of the tank 1, and the height of an inclined liquid surface 2 is detected. If the liquid surface 2 is inclined as shown in the figure, the gauge 3a indicates the highest, value and the gauge 3d indicates the lowest value, and these values Hmax and Hmin obtained by a comparator 4 and a length A of the longer side and a length B of the shorter side of the inside face of the tank 1 are used to operate a quantity Q of the liquid. That is, the quantity of the liquid is obtained in an arithmetic unit 5 in accordance with an equation Q= AXBX(Hmax+Hmin)/2 and is displayed on a display device 6. Thus, the accurate measured value is obtained independently of the variation of the liquid surface 2.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for measuring the amount of liquid in a self-propelled measuring tank.

[Conventional technology]

Measuring the amount of liquid in an automobile fuel tank or other moving tank is not always easy because the liquid level fluctuates due to vibration or tilting of the tank.

Conventionally, measurements have been made by installing a float inside the tank or using an electrical or electronic level gauge attached to the inner wall of the tank, but accurate measurements have been difficult due to the vibrations and inclination of the tank.

[Problem that the invention seeks to solve]

The present invention has been made to solve the above problems, and its purpose is to provide a method that can always accurately measure the amount of liquid in a self-propelled measuring tank.

[Means for solving problems]

In the present invention, level gauges are provided at each of the four corners of a measuring tank, and the maximum value Hma of the indicated values of the four level gauges is
The above object is achieved by calculating the liquid amount based on x and the minimum value Hmin.

If the measuring tank mentioned above is a rectangular parallelepiped tank, and if the lengths of the two sides of the bottom of the rectangular parallelepiped tank are A and B, then the liquid volume Q in the tank is calculated as Q-AxBx (Hmax + Hmin) ÷ 2. .

Furthermore, if the measuring tank is an elliptical tank, the width of the tank is W = W (Hmax + Hmin), and the length of the tank is L = L (Hmax + Hmin), then the liquid i1Q in the tank is approximately: Q=Q (Hmax +Hmin)-q (H
min ) +Wx L x (Hmax −Hm
It can be found by: ln)÷2.

[For production]

With the above method, the liquid volume Q is uniquely determined as a function of the highest value Hmax and the lowest value Hmin of the indicated values of multiple level gauges, so it is independent of fluctuations in the liquid level due to the slope of the tank, etc. The amount of liquid in the tank is required.

〔Example〕

Hereinafter, the method according to the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing an outline of one embodiment of an apparatus for carrying out the method according to the present invention, and FIG. 2 is an explanatory diagram showing an outline of another embodiment.

In Figure 1, 1 is a rectangular parallelepiped self-propelled measuring tank mounted on a car or other moving object, 2 is the liquid level stored in the tank, and 3a, 3b, 3c, and 3d are the four corners of the tank. Level gauges are installed on the inner walls of the walls and detect the height of the liquid level based on changes in electrical resistance and capacitance. 5 is a calculation device that calculates the amount of liquid in the tank according to a predetermined calculation formula based on the maximum and minimum values; 6
is a display device that displays the calculated value from the arithmetic device.

The length of the long side of the inner surface of the rectangular parallelepiped tank 1 is A1.
The length of the short side is B.

Since the tank 1 is mounted on a car or other moving object, it tilts in various directions when it is running, and the liquid level 2 of the liquid stored inside it is tilted with respect to the bottom of the tank as shown in the figure. Become. Therefore, the indicated values of the level gauges 3a, 3b, 3c, and 3d installed perpendicularly to the bottom of the tank at the four corners of the tank are different values.

Thus, in the state shown in the figure, the level gauge 3a shows the highest indicated value of t, and the level gauge 3d shows the lowest indicated value. If the highest indicated value is Hmax and the lowest indicated value is Hmin, then the volume of liquid in the tank is Q.
It is easily known mathematically that Q=AXBX (Hmax + Hmin)÷2. This equation holds true regardless of the direction and slope of the liquid level 2 relative to the bottom of the tank.

Therefore, the level gauges 3a, 3b, 3c, 3
Each of the outputs of d is input to the comparator 4 via an amplifier or the like not shown in the figure, and the highest indicated value Hmax and the lowest indicated value Hmin are selected from among the four indicated values, and these values are used as a predetermined code signal. The above formula Q=AXBX (Hmax + Hmin
)÷2, the liquid amount Q in the tank 1 can be obtained. The value obtained as described above is displayed on the display 6.

Fig. 2 shows the measurement principle when applying the measurement method according to the present invention to an elliptical tank. This is the liquid level of the liquid.

Tank width W=W (Hmax +Hmin),
The length of the tank is L-L (Hmax + Hmin), and the tank is tilted so that the liquid level 8 is on the plane connecting the lowest value Hmin and the highest value Hmax from the lower end P of the tank as shown in the figure. Suppose there is.

In such a case, the volume q below Hmin is known as q=q(Hmin) if calibrated in advance.

On the other hand, the volume ΔQ greater than or equal to Hmin and less than or equal to Hma is (Hm
ax − Hmln ) is not too large, ΔQ=W
X L X (Hmax - Hmln).

Therefore, the liquid volume Q in the elliptical tank 7 is approximately Q=Q
(Hmax +Hmin) = q (Hmin) +Wx L
-Hmln)÷2. Therefore, the highest indicated value Hmax and the lowest indicated value Hmin are extracted from the indicated values of the plurality of level gauges installed in the elliptical tank in the same manner as in the case of the rectangular parallelepiped tank, and based on these, the liquid volume in the tank is calculated. It can be calculated regardless of the slope of the tank.

Even in other specially shaped tanks, the volume of liquid filled inside the tank is a function of the variable height of the liquid level at multiple locations within the tank, which is the determining factor. Since this is required in most cases, it is possible to install level gauges at each of the multiple positions and calculate the amount of liquid in the tank based on a predetermined calculation formula from those readings, regardless of the slope of the tank. be.

〔Effect of the invention〕

Since the present invention is configured as described above, the present invention provides a liquid level measuring method that can accurately determine the liquid level in a tank regardless of changes in the liquid level due to the inclination of the tank, etc. It is something.

Note that the configuration of the method according to the present invention is not limited to the above embodiment (the formula for calculating the liquid volume based on the number of level gauges installed, the mounting position, and the indicated value of the level gauges can be changed according to the shape of the tank. The invention is intended to encompass all such modifications.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an outline of one embodiment of an apparatus for carrying out the method according to the present invention, and FIG. 2 is an explanatory diagram showing an outline of another embodiment.

Claims (1)

[Claims] 1) Level gauges are provided at each of the four corners of the measuring tank,
A method for measuring the amount of liquid in a self-propelled measuring tank, characterized in that the amount of liquid is calculated based on the highest value Hmax and the lowest value Hmin of the indicated values of the four level gauges. 2) The method for measuring the amount of liquid in a self-propelled measuring tank according to claim 1, wherein the measuring tank is a rectangular parallelepiped tank, and the liquid amount Q is calculated based on the following formula. Q = A × B × (Hmax + Hmin) ÷ 2 (However, A and B are the lengths of the two sides of the bottom of the rectangular parallelepiped tank.) 3) The measuring tank is an elliptical tank, and based on the following approximate formula A method for measuring a liquid amount in a self-propelled measuring tank according to claim 1, wherein the liquid amount Q is calculated by: Q=Q(Hmax+Hmin) =q(Hmin)+W×L×(Hmax-Hmin)÷
2 (However, W=W(Hmax+Hmin)...tank width L=L(Hmax+Hmin)...tank length.)