JP2018105779A - Detector for mobile entities - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detector which constitutes a fuel gauge of a vehicle such as a motor cycle, and with which it is possible to detect the inclination or acceleration, etc., occurring in the vehicle.SOLUTION: A composite sensor 1 equipped with a long bar-like rod 3, a sensor body 4 to which the rod 3 is fixed and a computation unit 5 is provided inside a fuel tank 2. The sensor body 4 includes a deformation part 4a that is deformed by the motion of the rod 3. Since a buoyant force corresponding to the amount of gasoline in the fuel tank 2 is applied to the rod 3, the output of the sensor body 4 makes it possible to detect the remaining amount of fuel. Furthermore, as the output value of the sensor body 4 changes in correspondence to the strength or direction of movement of the rod 3, it is possible for the computation unit 5 to detect the inclination or acceleration, etc., of a vehicle.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a detection device provided on a moving body and capable of detecting changes in acceleration, posture, and the like generated in the moving body, and is used particularly in a moving body such as a motorcycle, and the remaining amount of liquid fuel, the presence or absence of a fall, an inclination The present invention relates to a moving body detection device capable of detecting an angle, acceleration / deceleration, road surface conditions, and the like.

  In moving bodies such as motorcycles (including three-wheeled or four-wheeled vehicles, other ships, etc.), changes in the acceleration and posture of the moving body are detected to notify the user of the moving body, and the detected value is used for the moving body. It is used to control the power of the.

  Further, in the case of a moving body using liquid fuel such as gasoline, it is necessary to measure the remaining amount of liquid fuel, so that a fuel gauge is conventionally provided in a fuel tank. As this sensor for a moving body, Patent Document 1 discloses a vehicle equipped with a vehicle speed sensor and a liquid level sensor for detecting the liquid level in the fuel tank.

  In Patent Document 1, the vehicle level is determined by the liquid level sensor, and the vehicle acceleration / deceleration state is determined by the vehicle speed sensor. A technique for accurately measuring the remaining amount of fuel is described.

  In Patent Document 1, a specific configuration of the liquid level sensor is not disclosed, but a fuel fuel gauge having a configuration described in Patent Document 2 is known. The fuel fuel gauge disclosed in Patent Document 2 is a pressure sensor that is installed in a fuel tank so as to be movable up and down and detects the buoyancy generated in the float as a pressure. The remaining amount of fuel is measured.

JP 2007-327900 A Japanese Utility Model Publication No. 62-046337

  In Patent Document 1, the acceleration / deceleration state of the vehicle is determined by a vehicle speed sensor provided separately, and a separate sensor is required in addition to the liquid level sensor in order to measure the remaining amount of fuel. In this case, in order to measure the remaining amount of fuel, a vehicle speed sensor, a housing for the vehicle speed sensor, a connector and a harness for connecting the vehicle speed sensor and the control device are required, which causes an increase in cost. It was.

  Further, in the technique described in Patent Document 1, it is determined that the vehicle is inclined when the fluctuation amount per time of the liquid level sensor is detected and the fluctuation amount exceeds a threshold, but the direction of the inclination is grasped. I can't.

  Furthermore, in recent mobile bodies, it is desired to provide information to the user by detecting or measuring the presence / absence of a fall, the inclination of the vehicle body, acceleration, or road surface conditions, but simply increasing the number of sensors. However, the increase in the number of parts and the associated cost increase become a problem.

  In order to solve the above-described problems, the present invention aims to improve a detection device provided in a moving body such as a motorcycle, and more specifically, detects or measures an inclination, acceleration, or the like generated in the moving body with a small number of parts. An object of the present invention is to provide a detection device that can perform the above-described operation.

  In order to achieve the above object, a moving body detection apparatus according to the present invention is a moving body detection apparatus installed in a fuel tank of a moving body. A movable member that receives buoyancy, a deformation unit that is coupled to the movable member and generates distortion based on an operation of the movable member, a strain detection element that detects distortion of the deformation unit, and an output of the strain detection element A calculation unit that performs calculation using a value, wherein the calculation unit calculates a change of the moving body based on an output value from the strain detection element.

  According to the moving body detection device of the present invention, the movable member moves due to the change in the posture of the moving body or the acceleration / deceleration generated in the moving body, and the movement is detected by the strain detection element. Further, the calculation unit can calculate the magnitude of the movement of the movable member and the change in movement per unit time from the output of the strain detection element. Thereby, the detection device for a moving body of the present invention has a simple configuration as described above, such as acceleration generated by acceleration / deceleration of the moving body, inclination of the moving body caused by climbing or overturning, vibration generated in the moving body, and the like. Can be detected.

  In the moving body detection device of the present invention, the distortion of the deformable portion when the movable member moves in the liquid fuel level change direction is detected by the strain detection element. In this case, the change of the liquid level of the liquid fuel in the fuel tank is calculated by the calculation unit. Therefore, the moving body detection device of the present invention is a fuel gauge that detects the liquid level of the liquid fuel in the fuel tank.

  In the mobile body detection device of the present invention, the deformation portion is provided with the strain detection elements at least at two locations, and the strain detection elements are arranged in a specific tilt direction of the mobile body. It is preferable that they are arranged as described above. In this case, the calculation unit calculates the displacement of the moving body in the specific tilt direction. Here, the specific inclination direction is, for example, the left-right direction when detecting the falling of the moving body, and the front-rear direction when detecting acceleration / deceleration of the moving body. In addition, since the strain detection elements are provided in at least two places, noise can be canceled.

  Moreover, in the moving body detection device of the present invention, it is preferable that the deformation part is provided with the strain detection elements in at least two places facing in different directions with a connection part with the movable member as a center. For example, it is preferable to provide strain detection elements at one place in the front-rear direction and one place in the left-right direction of the moving body around the connecting portion. In this case, the calculation unit can calculate the direction of inclination of the movable member from the ratio of the outputs of the strain detection elements provided in different directions.

  In the moving body detection device of the present invention, it is preferable that the movable member has a long shape extending in the depth direction of the liquid fuel. According to the said structure, since members, such as an arm and a float, are not required like the conventional fuel meter, the installation operation to a fuel tank becomes easy.

  Further, a reserve portion having a concave part formed at the bottom surface is formed in the fuel tank, and when the liquid level of the liquid fuel is lowered, the tip end portion of the movable member in the liquid fuel is It is preferable that it can be inserted into the reserve part. According to this configuration, the remaining amount of fuel can be detected by the movable member even when the fuel in the fuel tank decreases and remains only in the reserve portion.

  In the moving body detection apparatus of the present invention, the ratio of the horizontal sectional area of the movable member to the horizontal sectional area inside the fuel tank is constant with respect to the depth direction of the fuel tank. Preferably there is. According to the said structure, the increase / decrease in the value calculated by the said calculating part corresponds with the increase / decrease in the fuel in a fuel tank. Therefore, for example, the scale of the fuel gauge that notifies the remaining amount of fuel can be set to a certain width.

  Moreover, in the moving body detection device of the present invention, it is preferable that a cross-sectional area of the movable member is larger at a portion of the movable member positioned on the bottom surface of the fuel tank than at a portion above it. According to this configuration, since the horizontal cross-sectional area of the movable member is large on the bottom surface side of the fuel tank, a change in buoyancy generated in the movable member increases with increase / decrease in fuel. Therefore, according to this configuration, since the scale of the fuel gauge that notifies the remaining amount of fuel when the fuel in the fuel tank is low can be widened, the fuel can be accurately measured in the state where the fuel is low. Can be notified.

  According to the present invention, it is possible to detect not only the liquid level of the liquid fuel in the fuel tank of the moving body but also the inclination, acceleration, etc. generated in the moving body with a small number of parts.

Explanatory sectional drawing which shows the state in which the composite sensor of the 1st Embodiment of this invention is provided in the fuel tank. (A) is explanatory sectional drawing which shows the principal part of the composite sensor of 1st Embodiment, (B) is explanatory top view which shows the principal part of the composite sensor. Explanatory sectional drawing which shows the action | operation of the composite sensor of 1st Embodiment. Explanatory sectional drawing which shows the action | operation of the composite sensor of 1st Embodiment. (A) And (B) is explanatory sectional drawing which shows the composite sensor of 2nd Embodiment. Explanatory sectional drawing which shows the composite sensor of 3rd Embodiment. (A) is explanatory sectional drawing which shows the composite sensor of 4th Embodiment, (B) is explanatory drawing which shows the scale of a fuel gauge. (A) is explanatory sectional drawing which shows the composite sensor of 5th Embodiment, (B) is explanatory drawing which shows the scale of a fuel gauge.

  With reference to FIGS. 1-8, the detection apparatus of the moving body which is embodiment of this invention is demonstrated. In the present embodiment, a two-wheeled vehicle (hereinafter abbreviated as a vehicle if necessary) is used as the moving body, and a composite sensor that detects the remaining amount of fuel in the fuel tank and detects the state of the vehicle as an example of the detection device. explain.

  FIG. 1 is a cross-sectional view of a fuel tank 2 equipped with a composite sensor 1 according to a first embodiment of the present invention. The Z direction in FIG. 1 is the vertical direction of the vehicle, and the Y direction in FIG. Indicates the front-rear direction. In FIG. 1, the right side in the figure indicates the front of the vehicle, and the left side indicates the rear of the vehicle. Gasoline G, which is a liquid fuel, is injected into the fuel tank 2, and the liquid level L indicates a state at a level of about 60% in the tank.

  A composite sensor 1 that detects a liquid level L of gasoline G is provided in the fuel tank 2. The composite sensor 1 is provided with a rod (movable member) 3 that is inserted into the gasoline G and receives buoyancy, and a sensor body 4 that can detect various changes occurring in the rod 3. The sensor body 4 is electrically connected to the calculation unit 5.

  As shown in FIG. 2A, the rod 3 is fixed to the lower end portion of the sensor main body 4, and is installed so that the longitudinal direction of the rod 3 is the Z direction. In the present embodiment, the rod 3 is a solid or hollow rod-shaped member made of synthetic resin or light metal. The material of the rod 3 is not particularly limited as long as it is a material resistant to gasoline G, such as a material used for a normal float.

  The sensor body 4 is made of stainless steel, and includes a deformed portion 4a having a small thickness, a thick support portion 4b, and a central thick portion 4c, as shown in FIG. Further, as shown in FIG. 2B, strain detecting elements 6 (6a, 6b, 6c, 6d) are provided on the inner surface of the deformable portion 4a. The strain detecting element 6 is a printing type strain gauge, and is formed by printing and sintering a resin film, a resistance pattern and the like on the deformed portion 4a. Alternatively, the detection element 9 is a strain gauge in which a resistor is printed on the surface of the film substrate. In addition, a lead wire 7 is connected to the strain detection element 6 and connected to the calculation unit 5.

  As shown in FIG. 2B, the strain sensing element 6 is composed of front and rear strain sensing elements 6a and 6b arranged in the Y direction and left and right strain sensing elements 6c and 6d arranged in the X direction. ing. Each of these strain sensing elements 6 is provided in pairs with a central thick part 4c to which the rod 3 is fixed being sandwiched between the centers.

  The calculation unit 5 is configured by a microcomputer including a CPU, a memory, and other electronic devices (not shown). The calculation unit 5 receives an output signal from the strain detection element 6 and detects the acceleration or the like caused by the inclination of the vehicle or the acceleration / deceleration of the vehicle, in addition to the liquid level L of the gasoline G.

  Next, with reference to FIG. 3, the operation | movement at the time of detecting the liquid level L of the gasoline G in the fuel tank 2 with the composite sensor 1 of this embodiment is demonstrated. FIG. 3 shows a state in which the rod 3 is pushed upward by the buoyancy from the gasoline G. Note that the buoyancy that the rod 3 receives from the gasoline G increases as the volume of the rod 3 immersed in the gasoline G increases. That is, the larger the amount of gasoline G, the larger the volume in which the rod 3 is immersed and the greater the buoyancy received. When the sensor body 4 is pushed upward by the rod 3, the deformation portion 4a is deformed. The deformation at this time is a deformation in which the inner (upper) surface of the deformable portion 4a is pulled and the outer (lower) surface contracts as shown in FIG.

  When the amount of gasoline G in the fuel tank 2 is small, the liquid level L is low and the buoyancy generated in the rod 3 is small, so the deformation generated in the deforming portion 4a is also small, and the amount of strain detected by the strain detecting element 6 Becomes smaller. Conversely, as the amount of gasoline G increases, the liquid level L increases and the buoyancy generated in the rod 3 increases, so that the deformation generated in the deforming portion 4a also increases, and the amount of strain detected by the strain detecting element 6 also increases. Become.

  The calculation unit 5 calculates the liquid level L of the gasoline G from the output signal of the strain detection element 6. For example, the liquid level L of the gasoline G can be obtained from the amount of distortion detected by the strain detection element 6 using a correspondence table between the output value of the strain detection element 6 and the liquid level L of the gasoline G.

  Next, with reference to FIG. 4, the operation of the composite sensor 1 of the present embodiment when a vehicle that is a motorcycle falls is described. In FIG. 4, the direction indicated by the arrow 12 below the rod 3 indicates the left side of the vehicle. That is, the horizontal direction in FIG. 4 is the X direction. When the vehicle falls to the left side, as shown in FIG. 4, the lower end portion of the rod 3 falls to the left side due to its weight, so that the deformed portion 4a is held in a deformed state.

  When the rod 3 is tilted to the left in this way, the deformation on the pulling side occurs on the surface of the left deformable portion 4a in FIG. 4 and is detected by the left strain detecting element 6c among the left and right strain detecting elements 6c and 6d. The amount of distortion changes. In FIG. 4, deformation on the compression side occurs on the surface of the right deformation portion 4a, and the amount of strain detected by the right strain detection element 6d changes. That is, the strain (deformation method) detected by the left and right strain detection elements 6c and 6d changes depending on whether the rod 3 is tilted to the left or right, and the greater the tilt of the rod 3 (the tilt of the vehicle), the greater the amount of distortion. Will grow.

  Such a change in the amount of strain detected by the left and right strain detecting elements 6c, 6d is transmitted as an output signal to the computing unit 5, and the computing unit 5 calculates the tilt direction and the magnitude of the tilt of the rod 3. . The calculation unit 5 calculates the angle of inclination of the rod 3 from the calculation result. When the inclination of the rod 3 exceeds a predetermined threshold (for example, 35 °) and is maintained for a predetermined time (for example, 5 seconds), the vehicle falls over. Judge that it was done.

  In this case, it is possible to perform processing such as transmitting a signal indicating that the vehicle has fallen from the calculation unit 5 to a vehicle control unit (not shown), turning off the ignition switch, and stopping the engine. Thus, the composite sensor 1 of this embodiment also functions as a fall sensor.

  If the vehicle falls and stops in a so-called jackknife state (the rear wheel is high) or vice versa, the front-rear strain detecting element 6a in FIG. The state is detected by 6b. When the vehicle is tilted in an oblique state, the angle can be detected based on the ratio of output signals from the front and rear strain detection elements 6a and 6b and the left and right strain detection elements 6c and 6d.

  Next, with reference to FIG. 4, the operation | movement at the time of detecting an acceleration with the composite sensor 1 of this embodiment is demonstrated. Here, in FIG. 4, the left-right direction is the Y direction, the right side is the front of the vehicle, and the left side is the rear of the vehicle. In FIG. 4, when the vehicle accelerates in the forward direction, the rod 3 swings in the direction indicated by the arrow 12 below the rod 3. The swing of the rod 3 varies depending on the acceleration of the vehicle. When the vehicle decelerates, the rod 3 swings in the direction opposite to the arrow 12.

  When the rod 3 swings, as shown in FIG. 4, the deforming portion 4a is deformed, and the deformation is detected by the front and rear strain detecting elements 6a and 6b. The computing unit 5 calculates the magnitude and direction of acceleration applied to the vehicle by calculating the magnitude of the output of the strain sensing element 6 and the amount of change per unit time. Since the strain detection element 6 includes the front and rear strain detection elements 6a and 6b and the left and right strain detection elements 6c and 6d, the angle is determined not only by the front and rear and left and right directions but also by the ratio of these output signals. Can be detected. The vehicle acceleration calculated in this way can be used for control such as auto cruise of the vehicle, engine control, and the like.

  In addition, since the composite sensor 1 of the present embodiment has a configuration of a long rod-shaped rod 3 and a short columnar sensor body 4, unlike a conventional fuel gauge having an arm and a float, the fuel sensor 2 is provided. The installation work becomes easy. For example, a mounting hole through which the rod 3 and the sensor body 4 can be inserted is provided in the top plate of the fuel tank, the sensor body 4 is fixed to the lid member of the mounting hole, and the rod 3 and the sensor body 4 are connected to the fuel tank from the mounting hole. The composite sensor 1 can be installed by inserting it inside and attaching the lid member to the fuel tank.

  Next, a second embodiment of the moving body detection device of the present invention will be described with reference to FIG. FIG. 5A is a cross-sectional view of the fuel tank 2 viewed from the side of the vehicle, and the left-right direction in the figure is the Y direction (the front-rear direction of the vehicle). FIG. 5B is a cross-sectional view of the fuel tank 2 viewed from the front or the rear of the vehicle, and the left-right direction in the figure is the X direction (the left-right direction of the vehicle).

  The composite sensor 1a according to the second embodiment is arranged such that the rod 3 is located at the center of the fuel tank 2 in a side view and a front-back view. Since other configurations are the same as those in the first embodiment, the calculation unit 5 and the like are not shown in FIG. 5 (the same applies to the following embodiments).

  In the composite sensor 1a of the second embodiment, for example, when the vehicle accelerates, the liquid level L of gasoline in the fuel tank 2 is in a state as indicated by the dotted line L ′ in FIG. There is almost no change in the liquid level of the gasoline detected by 1a. When the vehicle is turning, the gasoline level L in the fuel tank 2 is in a state as indicated by a dotted line L ″ in FIG. 5B. In this case as well, the gasoline level detected by the composite sensor 1a is used. There is almost no change in position.

  As described above, according to the composite sensor 1a of the second embodiment, even when the posture of the vehicle and the acceleration applied to the vehicle are changed and the gasoline level L in the fuel tank 2 is inclined, The influence on the liquid level of gasoline detected by the composite sensor 1a can be minimized.

  Next, a third embodiment of the moving body detection apparatus of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view of the fuel tank 2a in which the composite sensor 1b of the third embodiment is installed, and a reserve portion 8 is formed on the bottom surface. The reserve portion 8 has a shape in which the bottom surface of the fuel tank 2a protrudes downward, and when the remaining amount of fuel is low, the remaining fuel is collected in the reserve portion 8. FIG. 6 shows a state where gasoline remains only in the reserve portion 8.

  In the composite sensor 1b of the third embodiment, the tip of the rod 3 is inserted into the reserve portion 8. According to this configuration, the liquid level L can be detected by the composite sensor 1b even when the fuel in the fuel tank 2 is low. Therefore, it is possible to notify that the fuel is low in the fuel gauge of the vehicle.

  Next, a fourth embodiment of the moving body detection device of the present invention will be described with reference to FIG. FIG. 7A is a cross-sectional view of the fuel tank 2 in which the composite sensor 1c of the fourth embodiment is installed. The shape of the rod 3a is formed in accordance with the shape of the fuel tank 2b.

  The rod 3a has a ratio of a cross-sectional area inside the fuel tank b2 to a cross-sectional area of the rod 3a when the horizontal cross-section of the fuel tank 2b is viewed at a predetermined position, and a cross-sectional area of both at other positions. Are formed to have the same ratio.

  For example, when the fuel tank 2b has a shape that narrows downward as shown in FIG. 7A, the shape of the rod 3a is also formed to be narrowed downward according to the fuel tank 2b. FIG. 7B is an example of the scale in the fuel gauge, and the upper scale 9 indicates the scale width in the case of the cylindrical rod 3 having a constant diameter. On the other hand, the lower scale 10 in FIG. 7B indicates the scale width when the composite sensor 1c of the fourth embodiment is used.

  In the composite sensor 1c of the fourth embodiment, since the shape of the rod 3a is formed in accordance with the shape of the fuel tank 2b, the fuel consumption or The rate of change of the liquid level L due to refueling becomes constant. Therefore, the scale width of the fuel gauge can be constant at any position as shown by the scale 10 below in FIG.

  Next, a fifth embodiment of the moving body detection apparatus of the present invention will be described with reference to FIG. FIG. 8A is a cross-sectional view of the fuel tank 2 in which the composite sensor 1d of the fifth embodiment is installed. In the fifth embodiment, a large-diameter portion 3c and a large-diameter portion 3d having a large horizontal cross-sectional area are formed below the rod 3b.

  The large diameter portions 3c and 3d are formed of the same material as that of the rod 3 thereabove. For example, the large diameter portion 3c is four times the cross sectional area of the rod 3, and the large diameter portion 3d is a rod. It is possible to set arbitrarily such as 8 times the sectional area of 3.

  FIG. 8B is a scale 11 of the fuel gauge when the composite sensor 1d of the fifth embodiment is used. The scale width of the scale 11 is from F to 5 being measured by the normal rod 3, from 3 to 5 being measured by the large diameter part 3c, and from E to 3 being the large diameter part 3d. It is a place to be weighed by.

  According to the composite sensor 1d of the fifth embodiment, if the remaining amount of fuel in the fuel tank 2 is between F and 5L (liter), the liquid level L is detected at the normal rod 3 portion. Therefore, the increase / decrease in the fuel is detected with a constant width, and the scale 11 of the fuel gauge is also constant. If the remaining amount of fuel in the fuel tank 2 is between 5L and 3L, the liquid level L is detected by the large diameter portion 3c, so the scale width is wider than the scale width of 5L to F. If the remaining amount of fuel in the fuel tank 2 is between 3L and E, the liquid level L is detected by the large diameter portion 3d, so the scale width is wider than the scale width of 5L to 3L.

  Therefore, according to the composite sensor 1d of the fifth embodiment, the vehicle user can know in detail the remaining amount of fuel when the fuel in the fuel tank 2 is low. As a result, it is possible to prevent a situation where a so-called out of gas occurs due to carelessness of the user of the vehicle.

  In each of the above embodiments, the shape of the rod 3 is a solid rod. However, the shape of the rod 3 is not limited to this, and may be a hollow shape as long as it receives buoyancy from liquid fuel. It can be changed. In each of the above-described embodiments, the description has been given by taking gasoline as a moving body as an example of a fuel tank of a motorcycle. However, it is widely used for moving bodies having a liquid fuel fuel tank such as a four-wheeled vehicle, a ship, or a general-purpose machine. Can be used. Further, the liquid fuel is not limited to gasoline, and may be applied to liquids other than liquid fuel.

  Further, in each of the above embodiments, the central thickness portion 4c in which the rod 3 is fixed in the two directions of the front and rear strain detection elements 6a and 6b and the left and right strain detection elements 6c and 6d as the strain detection element 6. However, the present invention is not limited to this, and the strain detection elements may be arranged in an oblique direction, or the strain detection elements may be arranged in the vertical direction. Further, at least two strain detection elements may be provided in a specific direction without sandwiching the central thick part 4c.

  Moreover, although the printing type strain gauge is used as the strain detection element, the present invention is not limited to this, and a general-purpose strain gauge may be used by bonding. Further, as the strain detection element, other means such as an electrostrictive element (piezoelectric element) or a conductive resin whose resistance is changed by strain may be used.

  Further, the shape of the sensor body 4 is not limited to the above shape, and may be any shape as long as the change in the position of the rod 3 can be detected. The material is not limited to stainless steel, and other metals, synthetic resins, and the like can be used.

DESCRIPTION OF SYMBOLS 1,1a-1d ... Composite sensor 2 ... Fuel tank 3 ... Rod 4 ... Sensor main body 5 ... Operation part 6 ... Strain detection element 7 ... Lead wire 8 ... Reserve part G ... Gasoline L ... Liquid level

Claims (11)

In the moving body detection device installed in the fuel tank of the moving body,
A movable member inserted into the liquid fuel inside the fuel tank and receiving buoyancy from the liquid fuel;
A deformable portion connected to the movable member and generating distortion based on the operation of the movable member;
A strain detection element that detects the distortion of the deformation unit, and a calculation unit that performs calculation using an output value of the strain detection element,
In the calculation unit, the change of the moving object is calculated based on an output value from the strain detection element.   The mobile body detection device according to claim 1, wherein the distortion of the deformation portion when the movable member moves in the direction of change of the liquid fuel level is detected by the strain detection element.   The deformation portion is provided with at least two strain detection elements, and the strain detection elements are arranged so as to be aligned in a specific inclination direction of the moving body. The detection apparatus for moving bodies as described.   3. The moving body detection device according to claim 1, wherein the deformation detection element is provided in at least two locations facing in different directions around a connecting portion with the movable member.   The moving body detection device according to claim 2, wherein a change in a liquid level of the liquid fuel in the fuel tank is calculated by the calculation unit.   The moving body detection device according to claim 3, wherein a displacement of the moving body in the specific inclination direction is calculated by the calculation unit.   The said calculating part is a detection apparatus for moving bodies of Claim 4 which can be calculated even if it is the displacement of any inclination direction of a moving body.   The mobile body detection device according to claim 1, wherein the movable member has a long shape extending in a depth direction of the liquid fuel.   In the fuel tank, a reserve part having a concave part formed at the bottom is formed, and when the liquid level of the liquid fuel is lowered, the tip of the movable member in the liquid fuel is the reserve part. The moving body detection device according to claim 8, wherein the moving body detection device can be inserted into the unit.   The detection for a moving body according to claim 8 or 9, wherein a ratio between a horizontal sectional area of the movable member and a horizontal sectional area inside the fuel tank is constant with respect to a depth direction of the fuel tank. apparatus. 10. The moving body detection device according to claim 8, wherein a cross-sectional area of the movable member is such that a portion of the movable member located on a bottom surface of the fuel tank is larger than a portion above the movable member.

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