JP3139702U - On-vehicle tank collection amount calculation device and vacuum vehicle equipped with the same - Google Patents

Abstract

An object of the present invention is to provide a low-cost configuration using one level sensor and one or two tilt angle sensors, and to accurately detect even when an in-vehicle tank has an elliptical columnar shape, a cylindrical shape, an elliptical shape or an approximate elliptical cylindrical shape or an approximate cylindrical shape close to a circle. Providing an on-board tank collection amount calculation device that can calculate the volume of collected liquid.
A level sensor that detects a liquid level by moving up and down along a transparent tube as a liquid level gauge that indicates a liquid level that is a depth of collected liquid at a rear part of a vehicle-mounted tank, and a vehicle reference The tilt angle sensor that detects the tilt angle of the horizontal frame that is the horizontal plane relative to the earth's horizontal plane as the vehicle pitch angle and roll angle, and the level sensor that sends the emitted light are gradually lowered from the intended position, and the level sensor collects in the transparent tube. A motor that stops the vertical movement of the level sensor when it detects the reflected light from the liquid or when the level sensor detects the transmitted light that has passed through the transparent tube by gradually raising the level sensor that sends out the emitted light from the intended position. And a central processing unit for controlling and calculating the whole.
[Selection] Figure 1

Description

  The present invention relates to an in-vehicle tank collection amount calculation device that calculates the volume of collected liquid in an in-vehicle tank such as an elliptic cylinder or a cylinder mounted on a vehicle such as an automobile, and a vacuum vehicle including the same.

Conventionally, as a method for measuring the liquid collection amount (liquid amount) in the tank (more accurately, a method for calculating), there is one described in Patent Document 1.
This Patent Document 1 describes that level gauges are provided at the four corners of the measuring tank, and the liquid amount is calculated based on the maximum value and the minimum value of the indicated values of the four level gauges.
JP-A 61-264219

However, in the conventional method for measuring the amount of liquid collected in the tank (calculation method), it is necessary to provide level gauges (level sensors) at the four corners. The capacity of the tank is small, the collection efficiency is deteriorated, and the price is high due to the necessity of four level gauges, so that there is a problem of lack of practicality. In addition, when level gauges are provided at the four corners of the vehicle-mounted tank, there has been a problem that the existing vehicle needs to be significantly modified and lacks versatility. Further, the conventional liquid amount calculation method has a problem that it assumes an accurate elliptical shape and has a low calculation accuracy, and cannot accurately calculate the volume of the collected liquid.
With this in-vehicle tank collection amount calculation device, a vacuum vehicle equipped with the same, a collection amount calculation method in the in-vehicle tank collection amount calculation device, a program, and a recording medium, the device can be configured at low cost, and even for existing vehicles It can be easily installed without major modifications, and the volume of the collected liquid can be calculated accurately even if the on-board tank is elliptical, cylindrical, elliptical or approximate elliptical or circular Is required.

  In order to satisfy this requirement, the present invention can configure the device at low cost by using one level sensor and one or two tilt angle sensors, and can be easily externally attached to an existing vehicle. An in-vehicle tank collection amount calculation device capable of accurately calculating the volume of collected liquid even if the in-vehicle tank has an elliptical columnar shape, a cylindrical shape, an elliptical shape or an approximate cylindrical shape close to a circle, or 1 The volume of the collected liquid is accurate even if the in-vehicle tank has an elliptical column shape, a cylindrical shape, an elliptical shape or an approximate elliptical column shape or an approximate cylindrical shape close to a circle. An object of the present invention is to provide a vacuum vehicle equipped with an on-vehicle tank collection amount calculation device capable of calculating

  The vehicle-mounted tank collection amount calculation device of the present invention is a liquid collected in the rear part of a vehicle-mounted tank of an elliptical cylinder shape or a cylindrical shape, an approximate elliptical column shape approximated to an elliptical column shape or a cylindrical shape mounted on a vehicle such as an automobile. A level sensor that detects the liquid level in the transparent tube by moving up and down along the transparent tube as a liquid level gauge that indicates the liquid level height, and the earth of the horizontal frame that becomes the reference horizontal plane of the vehicle The tilt angle sensor that detects the tilt angle with respect to the horizontal plane as the vehicle pitch angle and roll angle, and the level sensor that sends out the emitted light are gradually lowered from the intended position, and the level sensor reflects the light reflected from the collected liquid in the transparent tube. Level sensor when the level sensor detects the transmitted light that has passed through the transparent tube by gradually raising the level sensor that sends the emitted light from the intended position. And a central processing unit that controls and calculates the entire vertical movement, and the central processing unit is based on the liquid level height, the pitch angle, and the roll angle in the transparent tube. The three-dimensional plane equation indicating the horizontal plane of the collected liquid is calculated, and the volume of the collected liquid is calculated from the calculated three-dimensional plane equation and the elliptical shape or the circular shape of the in-vehicle tank cross section.

  The vacuum vehicle according to the present invention moves up and down along a transparent tube as a liquid level gauge that indicates the liquid level height that is the depth of the collected liquid in the rear part of an elliptical columnar or cylindrical vehicle-mounted tank mounted on a vehicle such as an automobile. A level sensor that detects the liquid surface height in the transparent tube by moving, a tilt angle sensor that detects the tilt angle of the horizontal gantry as the reference horizontal plane of the vehicle with respect to the earth horizontal plane as the pitch angle and roll angle of the vehicle, and outgoing light When the level sensor detects the reflected light from the collected liquid in the transparent tube or gradually raises the level sensor sending the emitted light from the intended position. The level sensor has a motor that stops the vertical movement of the level sensor when it detects the transmitted light that has passed through the transparent tube, and a central processing unit that controls and calculates the whole. Based on the liquid level height, pitch angle, and roll angle in the transparent tube, the physical device calculates a three-dimensional plane equation indicating the horizontal plane of the collected liquid that is the earth horizontal plane in the in-vehicle tank, and the calculated three-dimensional plane equation and in-vehicle It has a configuration including an in-vehicle tank collection amount calculation device that calculates the volume of collected liquid from an elliptical shape or a circular shape of a tank cross section, an approximate elliptical shape approximated to an elliptical shape or a circular shape, or an approximate circular shape .

  The in-vehicle tank collection amount calculation device according to the present invention is a collecting liquid in the rear part of an in-vehicle tank having an elliptical columnar shape or a cylindrical shape, or an approximate elliptical columnar shape or an approximate cylindrical shape approximated to an elliptical column shape or a cylindrical shape mounted on a vehicle such as an automobile. A level sensor that detects the liquid level in the transparent tube by moving up and down along the transparent tube as a liquid level gauge that indicates the liquid level height, and the earth of the horizontal frame that becomes the reference horizontal plane of the vehicle The tilt angle sensor that detects the tilt angle with respect to the horizontal plane as the vehicle pitch angle and roll angle, and the level sensor that sends out the emitted light are gradually lowered from the intended position, and the level sensor reflects the light reflected from the collected liquid in the transparent tube. Level sensor when the level sensor detects the transmitted light that has passed through the transparent tube by gradually raising the level sensor that sends the emitted light from the intended position. A motor for stopping the vertical movement and a central processing unit for controlling and calculating the whole, and the central processing unit is based on the liquid level height, pitch angle and roll angle in the transparent tube, The three-dimensional plane equation indicating the horizontal plane of the collected liquid is calculated, and the calculated three-dimensional plane equation and the elliptical shape or circular shape of the in-vehicle tank cross section, or the approximate elliptical shape or the approximate circular shape approximated to the elliptical shape or the circular shape Since the volume of the collected liquid can be calculated from (a) the plane in the three-dimensional space indicated by the calculated three-dimensional plane equation and an elliptical cylinder or cylinder, or an approximate ellipse approximated to an elliptic cylinder or cylinder The volume of the collected liquid is accurately calculated by dividing the volume of the area enclosed by the columnar or approximate cylindrical vehicle tank (the volume of the surrounding area) into small volumes and integrating them. (B) The apparatus can be constructed at low cost by using one level sensor for detecting the liquid level height and one or two inclination angle sensors for detecting the biaxial inclination of the liquid level. (C) Even if the in-vehicle tank is an approximate elliptic cylinder shape or approximate cylinder shape approximated to an elliptic cylinder shape or a cylindrical shape, the volume of the collected liquid is accurately calculated using an ellipse or circle formula that approximates the shape of the in-vehicle tank in advance. (D) Furthermore, it is only necessary to install one level sensor, one or two tilt angle sensors, and a motor that moves the level sensor up and down. It is possible to easily attach to an existing vehicle without performing it, and the advantageous effect of being excellent in versatility can be obtained.

  Further, the central processing unit sets an ellipse or a circle, or an approximate ellipse approximated to an ellipse or a circle, a major axis and a minor axis, and a tank length that is a length in the front-rear direction of the vehicle-mounted tank; Measurement value acquisition means for calculating the liquid surface height in the transparent tube and acquiring the pitch angle and roll angle, and the plane indicated by the divided surface and the three-dimensional plane equation when the vehicle-mounted tank is divided into minute lengths in the front-rear direction Surrounded by a linear equation determining means for determining a two-dimensional straight line equation indicating the line of intersection with a two-dimensional straight line and an ellipse or circle, or an approximate ellipse or approximate circle shape approximated to an ellipse or circle Area calculating means for calculating the area for each minute length; and volume accumulating means for accumulating the volume obtained by multiplying each of the calculated areas by the minute length to obtain the volume of the collected liquid. Having Accordingly, (a) a two-dimensional straight line representing the height of the liquid surface at each minute length is the intersection line between the divided surface when the vehicle tank is divided into minute lengths in the front-rear direction and the plane indicated by the three-dimensional plane equation. And (b) the area surrounded by the two-dimensional linear equation and the ellipse or circle which is the longitudinal sectional shape of the in-vehicle tank, or the approximate ellipse or approximate circle approximated to the ellipse or circle, and the in-vehicle The volume of the collected liquid at each minute length can be calculated from the minute length of the tank, and (c) the total volume of the collected liquid can be accurately calculated by accumulating the volume of each minute length. An advantageous effect of excellent reliability can be obtained.

  Further, the central processing unit determines an intersection coordinate calculation means for obtaining an intersection of the two-dimensional straight line and the ellipse or circle, or an approximate ellipse or approximate circle approximated to the ellipse or circle, and determines a case number according to the value of the intersection A case number determining means for calculating an area surrounded by a two-dimensional straight line and an ellipse or circle, or an approximate ellipse or approximate circle shape approximated to an ellipse or a circle. (A) the exact intersection of a two-dimensional line with an ellipse or circle, or an approximate ellipse or approximate circle approximated to an ellipse or circle, and (b) By calculating the area using the exact liquid level according to the position of the intersection, the error caused by the position of the intersection can be eliminated, so the volume of the collected liquid can be calculated more accurately and reliably. Advantageous effect can be improved can be obtained.

  Furthermore, a ceiling plate and a floor plate disposed on the rear wall or side wall of the vehicle-mounted tank or the upper and lower ends of the transparent tube, respectively, and a parallel movement in the longitudinal direction of the transparent tube between the ceiling plate and the floor plate are driven by a motor. A driving unit that is disposed in the driving unit and moves up and down by driving of the driving unit, and a level sensor mounted on the carriage, and the level sensor emits outgoing light to the transparent tube, and A reflection type in which a light receiving portion that receives reflected light of the emitted light reflected by the collection liquid inside the transparent tube is disposed facing the transparent tube, or an emission portion and a transparent tube that emits the emitted light to the transparent tube. Since the light-receiving unit that receives the transmitted light of the transmitted outgoing light is a transmission type that is disposed opposite to each other with the transparent tube interposed therebetween, (a) the carriage is simply mounted on the ceiling plate and floor plate by driving the drive unit with a motor. Can be moved up and down between The reflection type or transmission type level sensor disposed on the carriage can be moved up and down along the transparent tube, and the reflected light reflected by the collected liquid or the transmitted light transmitted through the transparent tube can be surely received by the light receiving unit. (B) By detecting the intensity of the reflected light or transmitted light at the light receiving part, it is possible to discriminate bubbles and eliminate the influence of bubbles to measure the exact liquid level, Since the measurement error of the liquid level can be reduced, the advantageous effect that the volume of the collected liquid can be calculated more accurately and the reliability is excellent is obtained.

  The vacuum vehicle of the present invention has an elliptical columnar shape or a cylindrical shape mounted on a vehicle such as an automobile, or an approximate elliptical columnar shape approximated to an elliptical columnar shape or a cylindrical shape, or a depth of collected liquid at the rear part of an on-vehicle tank having an approximate cylindrical shape. A level sensor that detects the liquid level in the transparent tube by moving up and down along the transparent tube as a liquid level gauge that indicates a certain liquid level height, and the inclination angle of the horizontal pedestal that becomes the reference horizontal plane of the vehicle with respect to the earth horizontal plane When the angle sensor detects the reflected light from the collected liquid in the transparent tube by gradually lowering the tilt angle sensor that detects the vehicle pitch angle and roll angle and the level sensor that emits the emitted light from the intended position. Alternatively, the level sensor that emits the emitted light is gradually raised from its intended position, and the vertical movement of the level sensor is stopped when the level sensor detects the transmitted light that has passed through the transparent tube. And a central processing unit for controlling and calculating the whole, and the central processing unit is a collective liquid that is a global horizontal plane in a vehicle-mounted tank based on the liquid level height, pitch angle, and roll angle in the transparent tube The three-dimensional plane equation indicating the horizontal plane of the tank is calculated, and the collected liquid is calculated from the calculated three-dimensional plane equation and the elliptical shape or circular shape of the in-vehicle tank cross section, or the elliptical shape or the approximate elliptical shape approximated to the circular shape. Equipped with an on-vehicle tank collection amount calculation device that calculates the volume, (a) excellent in space saving with a simple configuration, and (b) immediately calculating the accurate volume of the collected liquid at the site of the collection destination The advantageous effect that it can be obtained is obtained.

  In the present invention, an apparatus is constructed at low cost by using one level sensor and one or two tilt angle sensors, and an in-vehicle tank has an elliptical columnar shape or a cylindrical shape, or an elliptical columnar shape or an approximate elliptical columnar shape or an approximation. To calculate the volume of the collected liquid accurately even if it is cylindrical, calculate the three-dimensional plane equation of the collected liquid based on the liquid level height of the collected liquid and the pitch angle and roll angle of the vehicle tank. This was realized by calculating the volume of the collected liquid from the three-dimensional plane equation and the ellipse or circle of the vehicle tank, or the approximate ellipse or approximate circle approximated to the ellipse or circle.

  An on-vehicle tank collection amount calculation device according to a first aspect of the invention made to solve the above problems is an elliptical columnar shape or columnar shape mounted on a vehicle such as an automobile, or an elliptical columnar shape or an approximate elliptical columnar shape approximated to a cylindrical shape, or A level sensor that detects the liquid level in the transparent tube by moving up and down along the transparent tube as a liquid level gauge that indicates the liquid level that is the depth of the collected liquid in the rear part of the approximate cylindrical vehicle-mounted tank; The level sensor that detects the tilt angle of the horizontal pedestal relative to the earth's horizontal plane, which is the reference horizontal plane of the vehicle, as the pitch angle and roll angle of the vehicle, and the level sensor that emits the emitted light is gradually lowered from the intended position When the sensor detects the reflected light from the collected liquid in the transparent tube or the level sensor that sends out the emitted light is gradually raised from its intended position, the level sensor passes through the transparent tube. A motor that stops the vertical movement of the level sensor when the transmitted light is detected, and a central processing unit that controls the whole, and the central processing unit adjusts the liquid level in the transparent tube, the pitch angle, and the roll angle. Based on the three-dimensional plane equation indicating the horizontal plane of the collected liquid that is the earth horizontal plane in the in-vehicle tank, it is approximated to the calculated three-dimensional plane equation and the elliptical shape or circular shape of the cross section of the in-vehicle tank, or the elliptical shape or the circular shape. The volume of the collected liquid is calculated from the approximate elliptical shape or the approximate circular shape, and (a) the plane in the three-dimensional space indicated by the calculated three-dimensional plane equation and the elliptical columnar shape, the cylindrical shape, or the elliptical columnar shape. Alternatively, the volume of the area surrounded by the approximate elliptical cylinder shape approximated to a cylindrical shape or the vehicle tank of the approximate cylindrical shape (the volume of the surrounding area) becomes the volume of the collected liquid. The volume of the collected liquid can be calculated accurately by dividing and integrating the volume into a minute volume. (B) One level sensor for detecting the liquid level and the inclination of the liquid level in two axes. The apparatus can be constructed at low cost by detecting one or two tilt angle sensors to detect, and (c) an in-vehicle tank is an elliptic cylinder or cylinder, or an elliptic cylinder or an approximate cylinder approximated to an elliptic cylinder or cylinder Even so, it is possible to accurately calculate the volume of the collected liquid using an ellipse or circle formula that approximates the shape of the vehicle tank in advance, and (d) one level sensor and one or two tilt angles. Since it is only necessary to install a motor that moves the sensor and level sensor up and down, it has excellent in-vehicle efficiency, and it can be easily installed on existing vehicles without major modifications, etc. Have.

Here, since the level sensor can be attached to the front or rear center of the in-vehicle tank, it can be selected according to the shape of the in-vehicle tank or the vehicle, and the degree of freedom in design can be improved.
In addition, the tilt angle sensor is disposed on a horizontal gantry serving as a reference horizontal plane of the vehicle, whereby the tilt angle of the liquid level in the in-vehicle tank can be measured as the tilt angle of the horizontal gantry with respect to the earth horizontal plane. As the tilt angle sensor, a sensor that can measure the tilt angle of the two axes corresponding to the pitch angle and roll angle of the horizontal platform of the vehicle with a single plane is suitably used. In addition, in the case of an inclination angle sensor that can measure only a uniaxial inclination angle, such as a level with a long installation area, two inclination angle sensors are arranged in a direction parallel to the longitudinal direction of the horizontal frame of the vehicle and a direction perpendicular thereto. Install and measure the pitch angle and roll angle of the horizontal stand separately.

  A second device made to solve the above-described problem is the on-vehicle tank collection amount calculation device described in the first device, wherein the central processing unit is an ellipse or a circle, or an approximation approximated to an ellipse or a circle. Initialization means for setting the major axis and minor axis of the ellipse or approximate circle, and the tank length that is the length in the front-rear direction of the vehicle-mounted tank, and the liquid surface height in the transparent tube is calculated and the pitch angle and roll angle are acquired. Measurement value acquisition means, linear equation determination means for determining an equation of a two-dimensional straight line indicating an intersection line between a division plane when the vehicle-mounted tank is divided into minute lengths in the front-rear direction and a plane indicated by the three-dimensional plane equation; Area calculation means for calculating the area surrounded by a two-dimensional straight line and an ellipse or circle, or an ellipse or an approximate ellipse approximated to a circle or the shape of an approximate circle, for each minute length, and each of the calculated areas And fine Volume accumulation means for accumulating the volume obtained by multiplying the length to obtain the volume of the collected liquid, and (a) by having the initialization means, Only by setting the ellipse or circle, or the major axis and minor axis of the approximate ellipse or approximate circle approximated to the ellipse or circle, and the tank length that is the length in the front-rear direction of the in-vehicle tank, it can be used for in-vehicle tanks with different dimensions and shapes. (B) By having the measurement value acquisition means, the liquid level height in the transparent tube is calculated based on the measurement value by the level sensor and the inclination angle sensor, and the pitch angle is obtained. The roll angle is obtained and a three-dimensional plane equation representing the liquid level in the vehicle tank can be easily obtained. (C) By having a linear equation determination means, the vehicle tank can be made minute in the front-rear direction. The intersecting line between the divided surface and the plane indicated by the three-dimensional plane equation can be obtained as a two-dimensional linear equation indicating the liquid surface at each minute length, and the liquid at an arbitrary point on the divided surface can be obtained. The surface height can be obtained, and (d) by having an area calculating means, a two-dimensional linear equation and an ellipse or circle that is the longitudinal cross-sectional shape of the in-vehicle tank, or an approximate ellipse or approximation approximated to an ellipse or circle The volume of the collected liquid at each minute length can be calculated from the area surrounded by the circle and the minute length of the vehicle tank. (E) By having a volume accumulation means, the volume of each minute length can be calculated. It has the effect of being able to calculate the total volume of the collected liquid by accumulation.

  A third device devised to solve the above problem is the on-vehicle tank collection amount calculation device described in the second device, wherein the central processing unit is a two-dimensional straight line and an ellipse or circle, or an ellipse or circle. Intersection point coordinate calculating means for obtaining an intersection point with an approximate ellipse or an approximate circle approximated to, and case number determining means for determining a case number in accordance with the value of the intersection point, and the area calculating means includes a two-dimensional straight line The method of calculating the area surrounded by the ellipse or circle, or the shape of the approximate ellipse or approximate circle approximated to the ellipse or circle is changed according to the case number, and (a) the intersection coordinate calculation means is By having a two-dimensional straight line and an ellipse or circle, or an exact intersection of an ellipse or an approximate ellipse approximated to a circle or an approximate circle, (b) having a case number determining means, That The appropriate case number can be determined according to the position of the point, and the area calculation means can select the area calculation method according to the case number, so the area is calculated using the exact liquid level height. It is possible to eliminate the error caused by the position of the intersection, and it is possible to calculate the volume of the collected liquid more accurately.

  A fourth device made to solve the above-described problem is the on-vehicle tank collection amount calculation device according to any one of the first to third devices, wherein the rear wall or side wall of the on-vehicle tank or the transparent tube is provided. A ceiling plate and a floor plate respectively disposed at the upper end and the lower end; a driving unit disposed in parallel with the longitudinal direction of the transparent tube between the ceiling plate and the floor plate; and a driving unit disposed in the driving unit. And a level sensor mounted on the carriage, and the level sensor emits the emitted light to the transparent tube and the emitted light reflected by the collected liquid inside the transparent tube. A light-receiving unit that receives the reflected light of the reflection type disposed opposite to the transparent tube, or an emission unit that emits the emitted light to the transparent tube and a light-receiving unit that receives the transmitted light of the emitted light transmitted through the transparent tube Transmission arranged opposite to each other across the transparent tube (A) The carriage can be moved up and down between the ceiling plate and the floor plate simply by driving the drive unit with a motor, and the reflective or transmissive type disposed on the carriage. The level sensor can be moved up and down along the transparent tube, and the reflected light reflected by the collected liquid or the transmitted light transmitted through the transparent tube can be reliably detected by the light receiving unit. (B) By detecting the intensity of reflected light or transmitted light, it is possible to discriminate bubbles and eliminate the influence of bubbles to measure the exact liquid level, thereby reducing the measurement error of the liquid level. As a result, the volume of the collected liquid can be calculated more accurately.

  Here, in addition to the bolt screw shaft, an endless belt, a chain, or the like disposed in an annular shape between the ceiling plate and the floor plate can be used as the drive unit. When a bolt screw shaft is used as the drive unit, a nut screwed onto the bolt screw shaft can be used as a carriage. By rotating the motor forward and backward, the carriage disposed in the drive unit can be moved up and down.

  In order to solve the above-mentioned problem, a vacuum vehicle according to a fifth aspect of the present invention includes the on-vehicle tank collection amount calculation device according to any one of the first to fourth aspects of the invention, and (a) one piece. The level sensor, one or two tilt angle sensors, and a motor that moves the level sensor up and down are all installed. It has the effect | action and effect that the volume of can be calculated.

(Embodiment 1)
FIG. 1 is a block diagram showing an on-vehicle tank collection amount calculation apparatus according to Embodiment 1 of the present invention.
In FIG. 1, 1 is a computer unit for performing overall control and data input, character / graphic display, data storage, etc., 2 is a printer interface unit for inputting / outputting data to / from the printer 7, and 3 is a tilting unit. An inclination angle sensor interface unit for capturing angle data from the angle sensor 8, a level sensor interface unit for inputting an on / off signal from a level sensor 17 described later, and a pulse motor 9 described later for driving an on / off signal. A pulse motor interface unit for outputting a drive signal to the pulse motor driver 9a, 6 is a limit switch interface unit for inputting on / off signals from limit switches 10 and 11 described later, and 8 is a later described vehicle such as an automobile. The inclination angle of the horizontal gantry 22 with respect to the earth horizontal plane is detected as the vehicle pitch angle and roll angle. An inclination angle sensor 9, a pulse motor 9 as a motor for moving the level sensor 17 up and down through a nut 13 as a carriage by a bolt screw shaft 12 arranged in parallel with the transparent tube 19, and 14 a limit switch 10, 11. Dogs for kicking the detection rods 10a and 11a, 15 is a ceiling plate that is the upper limit of the bolt screw shaft 12 as a drive unit, 16 is a floor plate that is the lower limit of the bolt screw shaft 12, and 17 is along a transparent tube 19 described later. A level sensor that detects the liquid level in the transparent tube 19 by moving up and down, 18 is mounted on a vehicle such as an automobile, and calculates the amount of liquid (liquid such as human excrement and various waste oils and waste liquids of animals such as livestock) An elliptical cylinder-shaped or cylindrical vehicle-mounted tank that is a target of the transparent tank 19 as a liquid level gauge that indicates the liquid level that is the depth of the collected liquid at the rear of the vehicle-mounted tank 18, 0 and 21 are communication pipes for communicating the inside of the in-vehicle tank 18 with the transparent pipe 19, and 22 is a horizontal frame as a reference horizontal plane of the vehicle for detecting an angular difference (pitch angle and roll angle) between the vehicle and the earth horizontal plane, Reference numeral 101 denotes a central processing unit (CPU) for controlling and calculating the whole, 102 an input device for inputting data, 103 a display device for displaying characters and figures, 104 a RAM for storing data, 105 for data and programs Is a bus for connecting the units 2 to 6 and 101 to 105.

2A is a perspective view showing the positional relationship between the vehicle-mounted tank 18 and the transparent tube 19, FIG. 2B is a longitudinal sectional view in the front-rear direction of FIG. 2A, and FIG. 2C is transparent. FIG. 2D is a longitudinal sectional view showing the inclination angle sensor 8, and FIG. 2E is a plan view showing the inclination angle sensor 8.
2 (a) and 2 (b), 20 and 21 are communication pipes similar to those in FIG. 1, and 23 is a liquid plane formed by the collected liquid in the in-vehicle tank 18 (the collected liquid which is the earth horizontal plane in the in-vehicle tank 18). , 24 is a collected liquid as a volume calculation target. As shown in FIG. 2A, the transparent tube 19 is attached to the rear center of the in-vehicle tank 18 via the communication tubes 20 and 21, and thus the transparent tube 19 has a liquid level height of the collected liquid at the rear portion of the in-vehicle tank 18. (The depth of the liquid) will be measured. The in-vehicle tank 18 usually has a front portion that is higher than the rear portion, and has a predetermined pitch angle with respect to the horizontal mount 22.
In FIG. 2C, 14 is the same carriage as in FIG. 1, 17 is the same level sensor as in FIG. 1, 24a is a bubble formed above the liquid surface of the transparent tube 19, and 25a is emitted from the level sensor 17. The light (emitted light) 25b is reflected light with respect to the emitted light 25a. The level sensor 17 is disposed on the carriage 14 so that the light emitting portion that emits the emitted light 25a and the light receiving portion that receives the reflected light 25b with respect to the emitted light 25a face the transparent tube 19, respectively.
In the transparent tube 19, the reflectance of light is large in the liquid portion, and thus the reflected light is strong, but the reflectance of light is small in the bubble portion, and therefore the reflected light is also weak. In the air portion, the reflected light is further weakened. In this way, only the liquid is detected. The level sensor 17 outputs an ON signal when strong reflected light is detected. In FIG. 1, the pulse motor 9 is driven to raise the carriage 13 until it contacts the ceiling plate 15. When the carriage 13 is raised, the dog 14 first kicks the detection rod 10a of the limit switch 10 and then kicks the detection rod 11a of the limit switch 11. Therefore, the central processing unit 101 sets the limit when the detection rod 11a is kicked. Since an ON signal is input from the switch 11, it can be recognized that the carriage 13 has contacted the ceiling plate 15. After determining the initial position of the carriage 13 in this way, the carriage 13 and the level sensor 17 that sends out the emitted light are gradually lowered, and the carriage 13 is detected when the level sensor 17 detects strong reflected light from the liquid. Stop. This position is the liquid level height z _a , which can be recognized by the number of pulses that drive the pulse motor.

Next, the principle of an example of the tilt angle sensor will be described.
2D and 2E, reference numerals 26a to 26e denote upper electrodes, 27a to 27e denote lower electrodes that form capacitors together with the upper electrodes 26a to 26e, 28a to 28e and 29a to 29e denote upper electrodes, and 30 denotes an upper electrode. A housing 33 that supports the flat plate 31 for the lower electrode and the flat plate 32 for the lower electrode is a liquid stored between the flat plate 31 for the upper electrode and the flat plate 32 for the lower electrode. The tilt angle sensor 8 utilizes the fact that the value of the capacitance (capacity) of the capacitor formed between the upper electrode and the lower electrode varies depending on the amount (that is, the thickness) of the stored liquid. As shown in (d), when the amount of liquid is large on the right side, the capacitance of the capacitor formed by the electrodes 26e and 27e is larger than the capacitance of the capacitor formed by the electrodes 26a and 27a. Using this, the amount (thickness) of the liquid in each part is calculated, and the tilt angle of the liquid 33, that is, the tilt angle of the vehicle is calculated.

FIG. 3 is a functional block diagram showing function realization means (means whose function is realized by a program) of the central processing unit 101.
In FIG. 3, reference numeral 111 denotes an ellipse or circle major axis 2 a and a minor axis (same for a circle) 2 b as the longitudinal cross-sectional shape of the in-vehicle tank 18 and a tank length c which is the length in the front-rear direction of the in-vehicle tank 18. Initialization means 112 to be set is measurement value acquisition means for acquiring the liquid level height z _a , the pitch angle θ _y, and the roll angle θ _x in the transparent tube 19.
Here, the relationship between the vehicle-mounted tank 18 and the coordinate axis xyz will be described. FIG. 5 is an explanatory diagram showing the relationship between the in-vehicle tank 18 and the coordinate axis xyz. The origin of the coordinate axis xyz is the lowermost center of the rear part of the vehicle-mounted tank 18. The longitudinal cross-sectional shape of the vehicle-mounted tank 18 in the left-right direction is, for example, an ellipse in FIG. 5, and the major axis direction of this ellipse is the x axis and the minor axis direction is the z axis. However, the center of the ellipse is at the position of x = 0 and z = b. The length direction of the elliptic cylinder in FIG. 5 is the y-axis. Moreover, the length of the vehicle-mounted tank 18 is the tank length c. FIG. 6 is a coordinate diagram showing zx coordinates. In FIG. 6, reference numeral 23 denotes the same liquid level as in FIGS. 2 (a) and 2 (b). In the zx coordinate, the angle formed by the liquid level 23 and the x axis is the roll angle θ _x , and the straight line representing the liquid level 23 is g _i . Note that g _i is a two-dimensional that indicates the liquid level height on the zx plane at the i-th minute length of the liquid level 23 when the vehicle-mounted tank 18 is divided into a minute length with respect to the front-rear direction (y direction). It is a straight line equation. FIG. 7 is a coordinate diagram showing yz coordinates. In FIG. 7, reference numeral 23 denotes the same liquid level as in FIGS. 2 (a) and 2 (b). In the yz coordinates, the angle formed between the liquid surface 23 and the y axis is the pitch angle θ _y .

Reference numeral 113 denotes an elliptical contour point calculating means for calculating an elliptical contour point. FIG. 8 is a zx coordinate diagram showing the ellipse contour points z ₁ (0), z ₁ (i), z ₁ (nx), z ₂ (0), z ₂ (i), z ₂ (nx). In FIG. 8, nx is the number of divisions of the major axis 2a, and Δx is the divided fine length.
114 determines a linear equation indicating a two-dimensional straight line g _i (FIG. 6) obtained from a three-dimensional plane equation representing the liquid level 23 when the vehicle-mounted tank 18 is divided into minute lengths in the front-rear direction (y direction). linear equation determining means, alpha determination unit for determining based on the value of alpha described later 115, 116 .alpha.z _a determination means for determining based on the value of the liquid level .alpha.z _a that varies with changes in the value of y 117 is an intersection coordinate calculating means for calculating the intersection coordinates of the ellipse and the straight line g _i shown in FIG. 6, 118 is a case number determining means for determining a case number according to the value of the intersection calculated by the intersection coordinate calculating means 117, 119 is an area calculation means for calculating the area surrounded by the two-dimensional straight line g _i and the shape of an ellipse or a circle (here, an ellipse) for each minute length, and 120 is the calculated area and the minute length. Accumulate the volume obtained by multiplication Volume accumulation means for determining the volume of the collected liquid, 121 is a slice number increase means for increasing the slice number j by “1”, and 122 is a slice number determination means for determining whether the slice number j has reached ny. It is. ny is the number of divisions when the in-vehicle tank 18 is divided into minute lengths Δy in the y-axis direction as shown in FIG.

  123 is a slice number resetting unit that resets the slice number j, 124 is a loading amount calculation determining unit that determines whether or not to calculate the current liquid volume loading amount (that is, the current liquid increase amount), and 125 is the total loading amount (or A loading amount calculation unit 126 for calculating (the current loading amount) is a storage unit for storing the calculation result in the RAM 104.

The operation of the on-vehicle tank collection amount calculation apparatus configured as described above will be described with reference to FIGS.
In FIG. 4, first, the initialization unit 111 includes an ellipse or a circle having a major axis 2 a and a minor axis 2 b (a = b in a circle) as the longitudinal cross-sectional shape of the in-vehicle tank 18 in the front-rear direction of the in-vehicle tank 18. The tank length c, which is the length, the flag (loading calculation flag) f _v whether or not to calculate the current loading amount (new loading amount) f _v , the liquid volume V = 0, the number of divisions nx, y in the x-axis direction An axial division number ny and a slice number j = 0 are set (S1). Next, the measurement value acquisition means 112 calculates the liquid level height z _a in the transparent tube 19 from the number of output pulses when the level sensor 17 is turned on, and inclines the pitch angle θ _y and the roll angle θ _x. Obtained from the angle sensor 8 (S2). As described above, the value of the liquid level height z _a is determined by lowering the carriage 13 that has reached the ceiling plate 15 until the level sensor 17 outputs an ON signal, and the number of motor output pulses ( It is obtained by counting the number of pulses for lowering the carriage 13).
Next, the ellipse contour point calculation means 113 performs the ellipse contour points z ₁ (0),..., Z ₁ (i),..., Z ₁ (nx), z ₂ (0), shown in FIG. .., Z ₂ (i),..., Z ₂ (nx) are calculated (S3). This is obtained by calculating z as shown in the equation (Equation 1) to (Equation 2) of the ellipse, and below the z coordinate z ₁ (i) of the upper point of the ellipse of (Equation 3) and the ellipse of (Equation 4). The z coordinate z ₂ (i) of the side point is obtained. Note that the x coordinate x _i = x _i-1 + (2a / nx) and x ₀ = −a.

Next, the linear equation determination means 114 is a two-dimensional representation that represents the liquid level 23 (see FIGS. 2A and 2B) when the vehicle-mounted tank 18 is divided into a minute length Δy in the front-rear direction (y direction). A linear equation indicating the straight line g _i (see FIG. 6) is determined (S4). The straight line g _i is a straight line obtained when the three-dimensional plane equation indicating the liquid level 23 is cut in parallel to the zx plane at the position of a certain y axis, and the x axis is x _{a as} shown in FIG. intersection, intersect at y _a and y-axis as shown in FIG. x _a and y _a are obtained from (Equation 5) and (Equation 6), and when y _j = j · Δy (j = 1, 2,..., m = ny), a linear equation showing a straight line g _i Is a three-dimensional plane equation (Equation 7) to (Equation 8) indicating the horizontal plane of the liquid. Here, if it replaces with y _aj = 1− (y _j / y _a ), g _i becomes (Equation 9), and (Equation 9) becomes (Equation 10) when transformed.

Further, the linear equation determination means 114 obtains α and β from (Equation 11) and (Equation 12), and using these α and β, g _i becomes (Equation 13).

Next, the α determination means 115 determines whether or not α = 0 has been reached (S5). α = 0 is a point where the liquid surface height becomes zero, and if area calculation is performed at α <0, a negative area is calculated as shown in FIG. It becomes. In order to avoid this, it is determined whether or not α has reached zero. If it is determined that α has reached zero, the process proceeds to step S13, and the area and volume are not calculated. Next, .alpha.z _a determination unit 116 determines whether the liquid level .alpha.z _a is less than 2b (S6). From FIG. 2B, it is impossible that αz _a <2b (that is, the liquid level reaches the highest part of the in-vehicle tank 18), but there is a possibility that the in-vehicle tank 18 is almost full. Therefore, this determination is performed. That is, (a oval area, the maximum area of the in-vehicle tank 18) area S = πab if becomes .alpha.z _a = 2b immobilized as (S17), the area calculation is not performed in step S9. As a result, it is possible to prevent the occurrence of an error due to S> πab and reduce the calculation time.

Next, the intersection coordinate calculation means 117 calculates the intersection coordinates C1 and C2 between the ellipse and the straight line gi shown in FIG. 6 (S7). The equation for obtaining the intersection coordinates of the ellipse and the straight line g _i is expressed by (Equation 14) and developed by (Equation 15). When A, B, and C are defined as (Equation 16), (Equation 17), and (Equation 18), x is expressed as (Equation 19), and expressed as (Equation 20) and (Equation 21). X1 and C2 of _C1 and _C2 are obtained as intersections. From (Equation 20), (Equation 21), and (Equation 13), z coordinates z _C1 and z _{C2 of} C1 and C2 corresponding to x _C1 and x _C2 are obtained as (Equation 22) and (Equation 23), The x coordinate and z coordinate of the two intersections C1 and C2 are obtained.

Next, the case number determination unit 118 determines a case number according to the value of the intersection calculated by the intersection coordinate calculation unit 117 (S8). This will be described with reference to FIGS. FIGS. 11A, 11 </ b> B, 11 </ b> C, and 11 </ b> D are coordinate diagrams showing cases 1, 2, 3, and 4. For example, to seek small volume by using the coordinate values on the ellipse in the vicinity of x = -a case of FIG. 11 (a), the coordinate values on the straight line g _i is between two intersections C1 and C2 It will be used to determine the minute volume. In the case shown in FIG. 11 (d) would determine the minute volume using 11 coordinates on the straight line g _i as in the case of (a) between the two intersection points C1 C2. After determining the case number in this manner (after replacing z ₁ (i) in step S8), the area calculating means 119 converts the two-dimensional straight line g _{i into} the shape of an ellipse or a circle (here, an ellipse). The enclosed area S is calculated for each minute length (S9). This area is obtained by using the trapezoidal formula (Equation 24).

Next, the volume accumulating means 120 accumulates the volume (S · Δy) obtained by multiplying each of the calculated areas S and the minute length Δy, and collects the collected liquid up to y _j = j · Δy. The volume V is obtained (S10). Next, the slice number increasing means 121 increases the slice number j by “1” at y _j = j · Δy (S11). Next, the slice number determination unit 122 determines whether the slice number j has reached ny (S12). When it is determined that the slice number j has reached ny, the process proceeds to step S13, and the slice number reset unit 123 resets the slice number j. If it is determined that the slice number j has not reached ny, the process returns to step S3. Next, the loading amount calculation determination means 124 determines whether or not to calculate the current liquid volume loading amount (that is, the current liquid increase amount) based on the loading calculation flag f _v (S14). If the calculation flag f _v = 1, the loading amount calculation means 125 calculates the current liquid volume inclusion amount V _a = V−V _b , and if the calculation flag f _v = 0, the current liquid volume inclusion amount V _a is calculated. It is not calculated (S15). Here, V _b is the loading amount at the previous measurement. Next, the storage unit 126 stores the calculated result V or V _a in RAM 104 (S16).

FIG. 9 is a functional block diagram showing the case number determining means 118 of FIG.
In FIG. 9, 127 is a C1 determining means for determining a case number based on the z coordinate value z _C1 of the intersection C1, 128 is a C2 determining means for determining a case number based on the z coordinate value z _C2 of the intersection C2, and 129 Z ₁ (i) replacement means for replacing the coordinate value of z ₁ (i) in accordance with the case number.

The operation of the case number determining unit 118 configured as described above will be described with reference to FIG. FIG. 10 is a flowchart showing the operation of the case number determining means 118.
In FIG. 10, first, the C1 determination means 127 determines whether or not the z coordinate value z _C1 > b of the intersection C1 (S21). If z _C1 > b, case number 1 (FIG. 11 (a)). ) Or 2 (FIG. 11B), and when z _C1 ≦ b, it is determined that the case number 3 (FIG. 11C) or 4 (FIG. 11D). In the case of z _C1 > b, the C2 determination means 128 determines whether or not the z coordinate value z _C2 ≧ b of the intersection C2 (S22). If z _C2 ≧ b, it is case number 1, and z _C2 < If it is b, it will determine with it being case number 2. In the case of z _C1 ≦ b, the C2 determination means 128 determines whether or not the z coordinate value z _C2 ≧ b of the intersection C2 (S23). If z _C2 ≧ b, it is case number 3, and z _C2 < If it is b, it will determine with it being case number 4. Based on the determination of these case numbers, the z ₁ (i) replacing unit 129 replaces the coordinate value of z ₁ (i) (S24).

In the present embodiment, the target in-vehicle tank 18 has an elliptical or circular longitudinal cross-sectional shape. However, even if the vertical cross-sectional shape is an elliptical approximation or a circular approximation, an elliptical that approximates the sectional shape in advance. Alternatively, by storing the equation of a circle, it can be applied in the same manner and exhibits the same actions and effects.
In the present embodiment, the level sensor 17 detects the liquid level using the reflected light 25b with respect to the outgoing light 25a. However, the present invention is not limited to this, and the transmitted light with respect to the outgoing light is used. You may make it do.
Further, although the limit switches 10 and 11 are provided in the vicinity of the ceiling board 15, they are provided in the vicinity of the floor board 16, and the level sensor 17 is raised after contacting the floor board 16 to detect the liquid level height z _a. It may be.
A trap may be connected in the middle of a pipe line connecting the in-vehicle tank 18 and a vacuum pump for sucking liquid into the in-vehicle tank 18. This prevents the collection liquid 24 from flowing into the vacuum pump and protects the vacuum pump. In addition, the collection liquid 24 is not only sucked and collected by reducing the pressure in the in-vehicle tank 18 reliably, but also the waste liquid and the like. Defoaming can be performed.

  As described above, according to the present embodiment, the central processing unit 101 sets the horizontal plane of the collected liquid 24 that is the earth horizontal plane in the in-vehicle tank 18 based on the liquid level height, the pitch angle, and the roll angle in the transparent tube 19. By calculating the three-dimensional plane equation shown and calculating the volume of the collected liquid 24 from the calculated three-dimensional plane equation and the elliptical shape or circular shape of the in-vehicle tank cross section, the three-dimensional plane indicated by the calculated three-dimensional plane equation Since the volume of the area surrounded by the elliptical columnar or cylindrical vehicle tank 18 (going area volume) becomes the volume of the collecting liquid 24, the collecting liquid is accurately obtained by dividing and integrating the surrounding area volume into a minute volume. The volume of 24 can be calculated, and one level sensor 17 for detecting the liquid level height and one tilt angle sensor for detecting the biaxial inclination of the liquid level of the collected liquid 24 Thus, the apparatus can be constructed at a low cost, and the volume of the collected liquid 24 can be accurately calculated even when the on-vehicle tank 18 is in the shape of an elliptic cylinder or a cylinder. Further, each of the level sensor 17 and the inclination angle can be calculated. Since it is only necessary to attach the pulse motor 9 or the like that moves the sensor 8 and the level sensor 17 up and down, the in-vehicle efficiency can be improved, it is excellent in space saving, and it can be easily attached to an existing vehicle without making a major modification. Can be versatile.

  Further, the central processing unit 101 calculates the liquid surface height in the transparent tube 19 and the initialization means 111 that sets the major and minor diameters of the ellipse or circle and the tank length that is the length in the front-rear direction of the in-vehicle tank 18. In addition, the measurement value acquisition means 112 that acquires the pitch angle and the roll angle, and a two-dimensional line that indicates the intersection line between the division surface and the plane indicated by the three-dimensional plane equation when the vehicle-mounted tank 18 is divided into minute lengths in the front-rear direction. A straight line equation determining means 114 for determining a straight line equation; an area calculating means 119 for calculating an area surrounded by a two-dimensional straight line and an elliptical or circular shape for each minute length; and each of the calculated areas. And the volume accumulation means 120 for accumulating the volume obtained by multiplying by the minute length to obtain the volume of the collected liquid 24, thereby dividing the vehicle tank 18 into the minute length in the front-rear direction. A two-dimensional straight line equation indicating the intersection line between the divided surface and the plane indicated by the three-dimensional plane equation can be obtained as a two-dimensional linear equation representing the height of the liquid surface of the collected liquid 24 at a minute length. The volume of the collected liquid 24 in a minute length can be calculated from the two-dimensional linear equation, the area surrounded by the ellipse or circle that is the longitudinal sectional shape of the vehicle tank 18 and the minute length of the vehicle tank 18. Since the total volume of the collected liquid 24 can be calculated by accumulating the volume of this minute length, the two level directions of one level sensor 17 for detecting the liquid level and the liquid level of the collected liquid 24 The apparatus can be constructed at a low cost by the single inclination angle sensor 8 that detects the inclination of the tank, and the volume of the collected liquid 24 can be calculated easily and accurately even if the in-vehicle tank 18 is in the shape of an elliptic cylinder or a cylinder. Can Furthermore, since only one level sensor 17, tilt angle sensor 8, and a pulse motor 9 that moves the level sensor 17 up and down, etc. need only be installed, the in-vehicle efficiency can be improved, space saving is excellent, and large-scale remodeling, etc. It can be easily attached to an existing vehicle without performing it, and has excellent versatility.

  Further, the central processing unit 101 includes an intersection coordinate calculation unit 117 for obtaining an intersection point between a two-dimensional straight line and an ellipse or a circle, and a case number determination unit 118 for determining a case number according to the value of the intersection point, and calculates an area. The means 119 is generated according to the position of the intersection of the two-dimensional straight line and the ellipse or circle by changing the calculation method of the area surrounded by the two-dimensional straight line and the shape of the ellipse or circle according to the case number. Since the error can be eliminated, the volume of the collected liquid 24 can be calculated more accurately.

  Further, the ceiling plate 15 and the floor plate 16 connected to the rear wall or side wall of the in-vehicle tank 18 or the upper and lower ends of the transparent tube 19, respectively, and the longitudinal direction of the transparent tube 19 between the ceiling plate 15 and the floor plate 16. A bolt screw shaft 12 that is rotated by a pulse motor 9, a nut 13 that is screwed to the bolt screw shaft 12 and moves up and down as the bolt screw shaft 12 rotates, and an output light 25 a to the transparent tube 19. A reflection type level sensor in which a light receiving part for receiving the reflected light 25b of the outgoing light 25a reflected by the collecting liquid 24 inside the transparent tube 19 and the light emitting part 25 facing the transparent pipe 19 is disposed on the nut 13 17, the nut 13 can be moved up and down between the ceiling plate 15 and the floor plate 16 simply by rotating the bolt screw shaft 12 with the pulse motor 9. The disposed level sensor 17 can be moved up and down along the transparent tube 19, and the reflected light 25b reflected by the collected liquid 24 can be reliably detected by the light receiving unit without detecting the bubbles 24a. Since the measurement error of the liquid level can be reduced, the volume of the collected liquid 24 can be calculated more accurately.

  Further, the liquid surface in the transparent tube 19 is moved up and down along the transparent tube 19 as a liquid level gauge indicating the liquid level height which is the depth of the collected liquid 24 in the rear part of the in-vehicle tank 18 having an elliptical column shape or a cylindrical shape. A level sensor 17 for detecting the height, an inclination angle sensor 8 for detecting an inclination angle of the horizontal mount 22 as a reference horizontal plane of the vehicle with respect to the earth horizontal plane as a pitch angle and a roll angle of the vehicle, and a level sensor along the transparent tube 19 17 has a pulse motor 9 as a motor that moves up and down 17 and a central processing unit 101 that controls and calculates the whole, and the central processing unit 101 adjusts the liquid surface height, pitch angle, and roll angle in the transparent tube 19. Based on the calculated three-dimensional plane equation indicating the horizontal plane of the collected liquid 24 that is the earth horizontal plane in the in-vehicle tank 18, and the calculated three-dimensional plane equation and the in-vehicle tank A vacuum vehicle equipped with an in-vehicle tank collection amount calculation device that calculates the volume of the collected liquid 24 from an ellipse shape or a circular shape with eight cross sections has a simple configuration and high in-vehicle efficiency and excellent space saving. An accurate volume of the collected liquid 24 can be immediately calculated.

  Furthermore, in the case where an approximate elliptical columnar or approximate cylindrical in-vehicle tank 18 that approximates an elliptical columnar shape or a cylindrical shape is used as the collection amount calculation object instead of the elliptical columnar or cylindrical in-vehicle tank 18, the in-vehicle tank 18 has an elliptical columnar shape. The volume of the collected liquid 24 is accurately calculated by using an elliptical or circular formula that approximates the shape of the in-vehicle tank 18 even if it is an approximate elliptical column shape slightly deviated from or an approximate cylindrical shape slightly deviated from the cylindrical shape. be able to.

  Furthermore, if there is a program for executing each step shown in FIG. 4 and FIG. 10, the program can be executed at an arbitrary time using an arbitrary computer, and any one of the collection amount calculation methods described above is arbitrary. Can be run in time.

  Furthermore, if there is a recording medium on which the program is recorded, the program can be executed at an arbitrary place at an arbitrary time by using a computer that can read the recording medium, and any one of the collection amount calculation methods described above can be used. Can run anywhere in time.

  The present invention relates to an in-vehicle tank collection amount calculation device that calculates the volume of collected liquid in an elliptical columnar or cylindrical in-vehicle tank mounted on a vehicle such as an automobile, and a vacuum vehicle equipped with the same. The apparatus can be constructed at low cost using two or more tilt angle sensors, and the collected liquid can be accurately collected even if the on-vehicle tank has an elliptical columnar shape, a cylindrical shape, an elliptical shape or an approximate elliptical cylindrical shape or an approximate cylindrical shape close to a circle. The volume can be calculated, and it can be easily attached to an existing vehicle without any major modification.

The block diagram which shows the vehicle-mounted tank collection amount calculation apparatus by Embodiment 1 of this invention (A) Perspective view showing the positional relationship between the in-vehicle tank and the transparent tube, (b) A longitudinal sectional view in the front-rear direction of (a), (c) An explanatory diagram showing a liquid level detection method of the transparent tube, (d) Inclination The longitudinal cross-sectional view which shows an angle sensor, (e) The top view which shows an inclination angle sensor Functional block diagram showing the function realization means of the central processing unit Flow chart showing operation of central processing unit Explanatory drawing which shows the relationship between vehicle-mounted tank and coordinate axis xyz Coordinate diagram showing zx coordinates Coordinate diagram showing yz coordinates Zx coordinate diagram showing elliptical contour points Functional block diagram showing the case number determination means of FIG. Flow chart showing operation of case number determination means (A) Coordinate diagram showing case 1 (b) Coordinate diagram showing case 2 (c) Coordinate diagram showing case 3 (d) Coordinate diagram showing case 4

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Computer part 2 Printer interface part 3 Inclination angle sensor interface part 4 Level sensor interface part 5 Pulse motor interface part 6 Limit switch interface part 8 Inclination angle sensor 9 Pulse motor 9a Pulse motor driver 10, 11 Limit switch 12 Bolt screw shaft 13 Nut (carriage)
14 Dog 15 Ceiling plate 16 Floor plate 17 Level sensor 18 Car tank 19 Transparent tube 20, 21 Communication tube 22 Horizontal mount 23 Liquid plane 24 Collected liquid 24a Bubble 25a Emission light 25b Reflected light 26a, 26b, 26c, 26d, 26e, 28a, 28b, 28c, 28d, 28e, 29a, 29b, 29c, 29d, 29e Upper electrode 27a, 27b, 27c, 27d, 27e Lower electrode 30 Housing 31 Upper electrode flat plate 32 Lower electrode flat plate 33 Liquid 101 Central processing unit ( CPU)
102 Input device 103 Display device 104 RAM
105 ROM
106 bus 111 initialization means 112 measurement value acquisition unit 113 elliptical contour point calculating unit 114 linear equation determining means 115 alpha determination unit 116 .alpha.z _a determination unit 117 intersection coordinate calculation unit 118 case number determining means 119 area calculation means 120 volume accumulator means 121 Slice number increasing means 122 Slice number determining means 123 Slice number resetting means 124 Loading amount calculation determining means 125 Loading amount calculating means 126 Storage means 127 C1 determining means 128 C2 determining means 129 z ₁ (i) Replacement means

Claims (5)

Indicates the liquid surface height that is the depth of the collected liquid in the rear part of the on-board tank of an elliptic cylinder or cylinder mounted on a vehicle such as an automobile, or an elliptic cylinder or approximate cylinder approximated to a cylinder. A level sensor that detects the liquid level in the transparent tube by moving up and down along the transparent tube as a liquid level gauge, and a tilt angle with respect to the earth horizontal plane of the horizontal frame that becomes the reference horizontal plane of the vehicle An inclination angle sensor that detects the angle and the roll angle, and the level sensor that sends out the emitted light is gradually lowered from the intended position, and when the level sensor detects reflected light from the collected liquid in the transparent tube. Alternatively, the level sensor that emits the emitted light is gradually raised from an intended position, and the level sensor detects the transmitted light that has passed through the transparent tube. It includes a motor for stopping the vertical movement of the sensor, and a central processing unit which controls the entire operation, and
The central processing unit calculates a three-dimensional plane equation indicating a horizontal plane of the collected liquid that is a global horizontal plane in the in-vehicle tank based on the liquid level height, the pitch angle, and the roll angle in the transparent tube. The volume of the collected liquid is calculated from the three-dimensional plane equation and the elliptical shape or circular shape of the cross section of the vehicle-mounted tank, or the approximate elliptical shape or the approximate circular shape approximated to the elliptical shape or the circular shape. Tank collection amount calculation device.   The central processing unit includes initialization means for setting the ellipse or circle, or the major and minor diameters of the approximate ellipse or approximate circle approximated to the ellipse or circle, and the tank length that is the length in the front-rear direction of the in-vehicle tank; , A measurement value acquisition means for calculating the liquid surface height in the transparent tube and acquiring the pitch angle and the roll angle; a dividing surface when the vehicle-mounted tank is divided into minute lengths in the front-rear direction; and the 3 A linear equation determining means for determining an equation of a two-dimensional straight line showing a line of intersection with a plane indicated by a two-dimensional plane equation, the two-dimensional straight line and the ellipse or circle, or an approximate ellipse or approximation approximated to an ellipse or circle Area calculating means for calculating each area surrounded by the shape of a circle for each minute length, and accumulating a volume obtained by multiplying each of the calculated areas by the minute length to accumulate the area. Vehicle tank collecting quantity calculating apparatus according to claim 1, characterized in that it comprises a volume accumulator means for determining the volume of liquid, the. The central processing unit includes an intersection coordinate calculation means for obtaining an intersection of the two-dimensional straight line and the ellipse or circle, or an approximate ellipse or approximate circle approximated to the ellipse or circle, and a case number according to the value of the intersection A case number determining means for determining
The area calculating means changes a method of calculating an area surrounded by the two-dimensional straight line and the ellipse or circle, or an approximate ellipse or approximate circle approximated to the ellipse or circle according to the case number. The on-vehicle tank collection amount calculation device according to claim 2, wherein:   A ceiling plate and a floor plate respectively disposed on a rear wall or a side wall of the vehicle-mounted tank or an upper end and a lower end of the transparent tube, and disposed between the ceiling plate and the floor plate in parallel with a longitudinal direction of the transparent tube. A drive unit that is driven by the motor; a carriage that is disposed in the drive unit and moves up and down by driving the drive unit; and the level sensor that is mounted on the carriage, wherein the level sensor is the transparent A reflection type in which an emission part for emitting emission light to a tube and a light receiving part for receiving reflected light of the emission light reflected by the collection liquid inside the transparent tube are arranged facing the transparent tube, or An emission part for emitting outgoing light to the transparent tube and a light receiving part for receiving the transmitted light of the outgoing light that has passed through the transparent tube are of a transmissive type arranged opposite to each other across the transparent tube. Claims 1 to 3 Vehicle tank collecting quantity calculating apparatus according to any one. A vacuum vehicle comprising the on-vehicle tank collection amount calculation device according to claim 1.

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