JPH0339880B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a liquid volume information calculation system, and is particularly applicable to a liquid volume tank attached to a moving object such as an aircraft that changes its attitude. Concerning an optimal liquid volume information calculation system.

<Prior Art> The conventional technology will be explained by taking as an example a liquid amount (=fuel) information calculation system installed in an aircraft (hereinafter abbreviated as "airframe"). Furthermore, when used in aircraft, capacitance type tank units are generally widely used as the sensor that measures the liquid level (liquid level sensor), which is the basis for calculating liquid volume information. Treated as "T/U" (abbreviation for tank unit).

As a conventional liquid quantity information calculation system, there is one shown in FIG. 6 (block diagram showing the configuration of a conventional liquid quantity information calculation system).

The configuration shown in Fig. 6 measures the liquid volume of the measured liquid Q in the liquid volume tank T with three T/U1 (the reason why the three T/U1 are set is that the liquid volume tank T changes its position. This is to make it possible to measure the liquid volume even in the case _of Information values regarding the aircraft input from _{the FA} and the condition input device 4 (fixed values, here,
From the weight V _A of the machine excluding the liquid to be measured Q, the center of gravity A _x , A _y of the machine in the XY direction, and the fixed center of gravity values F _x , F _y of the liquid Q in the A calculation circuit 3 calculates the total center of gravity values D _x and D _y .

The calculation formula for the total center of gravity D _x and D _y of the entire aircraft is as shown below.

D _x = (V _A · A _x + V _FD · F _x ) / (V _A + V _FD ) D _y = (V _A · A _y + V _FD · F _y ) / (V _A + V _FD ) ...(1) However, V _FD represents the total liquid volume weight.

<Problems to be Solved by the Invention> By the way, such a conventional liquid amount information calculation system has the following problems. The center of gravity of the liquid to be measured Q input from the condition input device 4 is a fixed value at one point in the liquid volume tank T, so if the machine is tilted, the center of gravity of the liquid to be measured Q will shift significantly, and the entire body will be The centers of gravity D _x and D _y also shift significantly. conventionally,
This was not considered a problem because flight performance was not very developed, but in recent years, FLY-BY-WIRE technology (a technology that controls flight performance using electronic circuits) has developed, and aircraft There has been a need to improve the stability control of aircraft, and an accurate center of gravity has become required. From this, the total center of gravity D _x , D _y due to the movement of the center of gravity of the liquid to be measured Q
The error has become a problem that cannot be ignored.

The present invention was made in view of the problems of the conventional technology, and it is possible to minimize the change in the total center of gravity of the aircraft due to the movement of the center of gravity of the liquid to be measured, thereby enabling optimal flight control. It is an object of the present invention to provide a liquid amount information calculation system that does the following.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the liquid volume information calculation system of the present invention includes a liquid volume tank provided in a moving object that changes its attitude, and a liquid volume information calculation system according to the present invention. In the liquid volume information calculation system, the liquid level of the liquid to be measured in the liquid volume tank decreases as the liquid level decreases as the liquid level decreases as the liquid level increases, using three liquid level sensors to calculate liquid volume information of the liquid to be measured. A plurality of tubes are arranged at predetermined intervals in the liquid volume tank so that the liquid volume of each part in the volume tank can be calculated, and a triangular room is formed as a combination of three of the plurality of tubes. A group of liquid level sensors that measure the level of the measured liquid in each part of the liquid volume tank by having a plurality of adjacent sensors with two out of the three sensors in common. The output of the surface level sensor group is derived, and the liquid volume is determined based on the output of the three liquid level sensors, the output of one of the three liquid level sensors, and the liquid level of the three liquid level sensors. Calculated based on an arithmetic expression that can be expressed as a function of the amount of inclination of the liquid level in the pitch direction determined from the output of the sensor and the amount of inclination of the liquid level in the roll direction determined from the outputs of the three liquid level sensors. The individual liquid volume information output section outputs individual liquid volume information, and the liquid volume information is input, and the liquid volume calculation section calculates the total liquid volume weight and the liquid volume center of gravity in the XY direction from each of the liquid volume information. , the digital control calculation unit calculates the amount of the moving object based on the value calculated by the liquid volume calculation unit, the known moving object weight value excluding the liquid to be measured, and the moving object center of gravity value in the XY direction.
It is characterized by comprising: a center of gravity calculation function configured to calculate the total center of gravity in the XY directions;

<Examples> Examples of the present invention will be described in detail below based on the drawings. It should be noted that overlapping parts in the drawings shown below and FIG.

FIG. 1 is a block diagram of the liquid volume information calculation system of the present invention, and FIG. 2 is a diagram showing the relationship between the liquid volume tank and the T/U.

In FIGS. 1 and 2, 10 is T/U. This T/U 10 has a plurality of substantially triangular rooms α ₁ , . . . connected by broken lines in FIG. α _o (hereinafter referred to as α _i . However, i
is 1...n. The same applies hereafter). Here, T/U10 is [(T/U)
₁ , (T/U) ₂ , (T/U) ₃ ] (This combination is (T/U)
U) _A ), ... [(T/U) _o-2 , (T/U) _o-1 ,
(T/U) _o ] (this combination is referred to as (T/U) _N ), and the liquid volume of the liquid to be measured Q in each chamber α _i is detected.

20 is an individual liquid amount information output section. This individual liquid volume information output section 20 calculates the liquid volume detection value (liquid level information) T _i in each room α _i obtained from the T/U 10 and outputs each liquid volume information λ _i . do. Here, the individual liquid volume information output unit 20 selects, for example, an appropriate one of the three T/Us included in each room, and calculates the liquid volume based on the liquid level (T/U output). Calculate.

Now, assuming that the liquid volume is V and the liquid level of T/U is H, the relationship between the liquid volume V and the liquid level H of T/U can be expressed as V=F (H, P, R). can. However, P is 3 T/U
R is the pitch direction of the liquid level obtained from the output (liquid level) of the three T/Us. Calculate from the level difference (may be input from an external sensor). F is a function, and since this function F varies depending on the shape of the room and is generally nonlinear, a method of approximating it using a polynomial or dividing it into sections can be applied. As an example, an operation such as V=a _i H+b _i +(C _i H+D _i )P+(E _i +F _i )R (2) may be performed. This is divided into sections according to the value of the liquid level H, and the coefficients a _i , b _i , C _i , D _i ,
This is the case where E _i and F _i are determined and the liquid level H is a linear expression.

By the way, the liquid volume information λ _i is the individual liquid volume weight value V _fi and liquid volume gravity center values F _xi , F _yi for each room α _i , and the liquid volume gravity center values F _xi , F _yi are Measurement liquid Q
It is obtained by performing correction calculations according to the slope of the water and the liquid level h.
Here, the correction calculation formula is, where ΔX is the change in the center of gravity g acting on the liquid to be measured, P is the pitch angle of the aircraft, and R is the roll angle, ΔX=g(h, P, R)...(3) can be expressed.

30 is a center of gravity calculation function. This center of gravity calculation function 30 calculates the total liquid volume weight V _FD and the liquid volume center of gravity F _x and F _y in the XY direction from each liquid volume information λ _i calculated by the individual liquid volume information output unit 20, and calculates these Values V _FD , F _x ,
The XY of the aircraft is determined from F _y and the information values regarding the aircraft input from the condition input device 60 (the known weight value V _A of the aircraft excluding the liquid to be measured and the center of gravity values A _x , A _y of the aircraft in the XY directions). Calculate the total center of gravity C _x and C _y in the direction.
This center of gravity calculation function 30 calculates the total liquid volume and weight V _FD ,
A liquid volume calculating section 40 calculates the liquid volume center of gravity F _x , F _y in the XY direction, and the calculated values V _FD , F _x , F _y are inputted via a digital bus, and the calculated values V _FD , F _x , F _y , a weight value V _A of the aircraft, and center of gravity values A _x , _Ay of the aircraft in the XY directions, and a digital control calculation unit 50 that calculates the total center of gravity C _x , C _y of the aircraft in the X and Y directions. The configuration diagram of the liquid amount calculation unit 40 and the digital control calculation unit 50 is shown in the third diagram.
Shown in Figures A and B. In FIG. 3A, 41 is an input interface (hereinafter abbreviated as "I/F");
Reference numeral 42 represents an output I/F, 43 a read-only memory (ROM), 44 a random access memory (RAM), and 45 an arithmetic function. In FIG. 4B, 51 is a condition input I/F, 52 is a liquid volume information input I/F, 53 is an output I/F, and 54 is a
ROM, 55 represents RAM, and 56 represents an arithmetic function, respectively.

FIG. 4 is a flow sheet of FIG. 1. The operation will be explained below using FIGS. 1 to 4.

The liquid volume detection value T _i detected by the T/U 10 is processed by the individual liquid volume information output unit 20, and the individual liquid volume weight V _fi and the liquid volume center of gravity values F _xi , F _yi which are the liquid volume information λ _i are processed. obtain.
This value is input to the center of gravity calculation function 30. The liquid volume calculation unit 40 of the center of gravity calculation function 30 calculates the total liquid volume and weight V _FD.
(=ΣV _fi ), and when V _FD ≠ 0, the liquid volume center of gravity F _x and F _y in the XY direction is calculated. Here, the calculation formula for the liquid volume gravity centers F _x and F _y in the XY directions is F _x =V _FD ·ΣF _xi /V _FD F _y =V _FD ·ΣF _yi /V _FD (4). The digital control calculation unit 50 calculates the following equation from the total liquid volume and weight V _FD , the liquid volume center of gravity in the XY directions F _x , F _y , the weight value V _A of the aircraft, and the center of gravity values A _x and A _y of the aircraft in the XY directions. Based on the aircraft's total center of gravity in the XY direction C _x , C _y
Calculate and output.

C _x = (V _A · A _x + V _FD · F _x ) / (V _A + V _FD ) C _y = (V _A · A _y + V _FD · F _y ) / (V _A + V _FD ) ...(5) <Invention Modification Example> By the way, the center of gravity calculation function 30 is not limited to the above-mentioned one. For example, the digital control calculation unit 50
The information V _A , A _x , A _y related to the functions input to the unit is input to the liquid volume calculation unit 40 via a bidirectional digital bus, and the liquid volume calculation unit 40 calculates equation (4) to obtain the result. The total center of gravity C _x and C _y of the aircraft in the XY directions may be returned to the digital control calculation unit 50 via the bidirectional digital bus and then output to the outside (of course, C _x and C _y are (It may be output from the liquid amount calculation section 40).

The method for obtaining the individual liquid volume gravity center values F _xi and F _yi is as follows:
The method is not limited to the method using the correction calculation formula (2). For example, it may be set as a fixed value for each room α _i . Alternatively, it may be set as a predetermined value that changes in accordance with a constant liquid level h _i for each room α _i based on FIGS. However, a value obtained by polygonal line approximation from the liquid level function (((h))) of the liquid to be measured may be used.

Also, the above was explained using the aircraft as an example, but
However, the present invention is not limited thereto, and can be used for objects whose posture changes to obtain effective results.

<Effects of the Invention> As described above in detail with the embodiments, the liquid level sensor is arranged so that the inside of the liquid level tank is divided into a plurality of rooms to obtain liquid level information in the room. According to the liquid volume information calculation system of the present invention that calculates the total center of gravity of an object based on this information and the known object weight value and object center of gravity value, the attitude of the object can be changed simply by providing a large number of T/Us. The change in the center of gravity of the liquid to be measured due to the movement of the liquid in the liquid volume tank along with the change in the center of gravity of the liquid to be measured due to the movement of the liquid to be measured in the liquid volume tank can be obtained without greatly deviating from the true value, so an accurate value of the total center of gravity of the aircraft can be obtained. Therefore, high controllability can be obtained by using the present invention.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the liquid volume information calculation system of the present invention, Figure 2 is a relationship diagram between the liquid volume tank and T/U, and Figures 3A and B are the configurations of the liquid volume calculation unit and digital control calculation unit. Figure 4 is the flow sheet of Figure 1,
Figures 5A and B are relationship diagrams of the liquid level and center of gravity of the liquid to be measured;
FIG. 6 is a block diagram showing the configuration of a conventional liquid volume information calculation system. 10...Liquid level sensor (T/U), 20...Individual liquid level information output unit, 30...Gravity center calculation function, 40...
...Liquid amount calculation section, 50...Digital control calculation section.

Claims (1)

[Scope of Claims] 1. A liquid volume tank is provided for a moving object that changes its posture, and the liquid level of the liquid to be measured in the liquid volume tank, which decreases as the moving object moves, is determined by three liquid levels. In a liquid volume information calculation system that calculates liquid volume information of the liquid to be measured by measuring using a level sensor, a predetermined amount of liquid is stored in the liquid volume tank so that the liquid volume of each part in the liquid volume tank can be calculated. A plurality of rods are arranged at intervals to form a triangular room as a combination of three of the plurality of rods, and two of the three rods are commonly used in the room and a plurality of the rods are arranged adjacently. The liquid level sensor group that measures the liquid level to be measured in each part in the liquid volume tank and the output of the liquid level sensor group are led to the output of the three liquid level sensors. Based on the liquid level, the output of one of the three liquid level sensors,
An operation that can be expressed as a function of the amount of inclination of the liquid surface in the pitch direction determined from the outputs of the three liquid level sensors and the amount of inclination of the liquid surface in the roll direction determined from the outputs of the three liquid level sensors. an individual liquid volume information output unit that outputs individual liquid volume information after calculating based on a formula; and a liquid volume calculation unit that inputs the liquid volume information and calculates the total liquid volume weight and the The liquid volume center of gravity is calculated, and a digital control calculation unit calculates the moving object based on the value calculated by the liquid volume calculation unit, the known moving object weight value excluding the liquid to be measured, and the moving object center of gravity value in the XY direction. A liquid volume information calculation system comprising: a center of gravity calculation function configured to calculate the total center of gravity in the XY directions of the liquid;