JP2011196743A - Vehicle weight measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle weight measuring instrument with its installation location easy to change and the weight of a vehicle accurately measured.SOLUTION: This vehicle weight measuring instrument includes: first and second weight meters m1 and m2 comprising first and second loading plates 21 and 31, respectively, differing in height from a horizontal road surface; a storage means 8M for therein storing a vehicle weight calculation expression derived based on an expression prepared in consideration of the balance of moments of force in the event of a first vehicle inclination state in which the front wheel of the vehicle is mounted on the loading plate 21, in the event of a second vehicle inclination state in which the front wheel thereof is mounted on the loading plate 31, and in the event of a third vehicle inclination state in which the rear wheel thereof is mounted on the loading plate 21; and an arithmetic means 8c for acquiring a measurement weight of the first weight meter m1 when the vehicle is in the first vehicle inclination state, a measurement weight of the second weight meter m2 when in the second vehicle inclination state, and a measurement weight of the first weight meter m1 when in the third vehicle inclination state, to calculate the weight of the vehicle based on these acquired measurement weights and the calculation expression.

Description

  The present invention relates to a vehicle weight measuring device for measuring the weight of a vehicle such as a cart such as a roll pallet and a truck.

  Conventionally, an axle weight meter is used as a measuring device for the axle weight of a vehicle such as a truck and the total weight of the vehicle. There are two types of axle weight gauges: an embedded axle weight gauge and a portable axle weight gauge installed on the road surface (see, for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 6-58796 JP 60-102526 A

  The embedded type axle load meter has a flat loading surface of the vehicle and can be measured with high accuracy, but cannot cope with a change in the installation location. On the other hand, the portable axle load meter can easily change the installation location as necessary, but there is a problem that it is difficult to measure with high accuracy because the vehicle is measured in an inclined state. .

  Patent Document 2 discloses a portable axle weight meter in which the height of the entire device is reduced to reduce the vehicle inclination angle and improve the measurement accuracy, but the vehicle is inclined. Since the axle weight is measured in the state, a measurement error is included. In addition, in the configuration of Patent Document 2, a load transducer that requires several tens of strain-generating portions attached with strain gauges is used to reduce the overall height of the device, and wiring work becomes complicated. Conceivable.

  Further, in a conventional axle load meter, in the case of a vehicle such as a truck loaded with luggage, if the center of gravity becomes high, it becomes difficult to stably travel, but the height of the center of gravity cannot be detected.

  The present invention has been made to solve the above-described problems, and provides a vehicle weight measuring device that can easily change the installation location and can accurately measure the weight (total weight) of the vehicle. It is an object. Another object of the present invention is to provide a vehicle weight measuring device capable of calculating the height of the center of gravity of the vehicle.

  In order to achieve the above object, a vehicle weight measuring device of the present invention has a first both-wheel loading plate whose height from a horizontal road surface is a first height, and the first both-wheel loading plate has a first height. A first weighing scale that measures a weight according to an applied vertical load; and a second both-wheel loading plate having a second height different from the first height from the road surface, A second weigh scale that measures the weight according to the vertical load applied to the second two-wheel loading plate; and left and right front wheels of the vehicle are placed on the first two-wheel loading plate, and the left and right rear wheels of the vehicle are Assuming a first vehicle leaning state on the road surface, the vehicle's front axle when the vehicle is in a horizontal state with the vehicle weight and the front and rear wheels of the vehicle on the road surface And a horizontal distance between one axle of the rear axle and the center of gravity of the vehicle, and the vehicle in the horizontal state The height of the center of gravity of the vehicle from the surface is an unknown, and is measured by the distance between the front and rear shafts of the vehicle, the first height of the first two-wheel loading plate, and the first weighing scale. The first equation showing the relationship between the three unknowns created by taking into account the balance of the moment of force around the axis passing through the contact point between the left and right rear wheels and the road surface, with the weight to be a known number And assuming the second vehicle inclination state in which the left and right front wheels are placed on the second both-wheel loading plate and the left and right rear wheels are on the road surface, The horizontal distance between the one axle when the vehicle is in a horizontal state and the center of gravity of the vehicle, and the height of the center of gravity of the vehicle from the road surface when the vehicle is in a horizontal state are unknowns, and the distance between the axes , The second height of the second two-wheel loading plate, and the second weight First, the relationship between the three unknowns created by considering the balance of moments of force around the axis passing through the contact point between the left and right rear wheels and the road surface, where the weight measured by the meter is a known number. Assuming the equation of 2 and a third vehicle tilt state in which the left and right rear wheels are placed on the first or second both-wheel loading plate and the left and right front wheels are on the road surface, The weight of the vehicle, the horizontal distance between the one axle when the vehicle is in a horizontal state and the center of gravity of the vehicle, and the height of the center of gravity of the vehicle from the road surface when in the vehicle horizontal state are defined as unknowns. The distance between the shafts, the first or second height which is the height of the first or second both-wheel loading plate on which the rear wheel is placed, and the first on which the rear wheel is placed. Or the weight measured by the second scale As a number, it was derived on the basis of a third equation showing the relationship between the three unknowns, which is created in consideration of the balance of the moment of force around the axis passing through the contact point between the left and right front wheels and the road surface. Storage means for preliminarily storing a vehicle weight calculation formula for calculating the weight of the vehicle, and a first measured by the first weighing scale when the vehicle is in the first vehicle tilt state. A weight, a second weight measured by the second weigh scale when the vehicle is in the second vehicle tilt state, and the first or second when the vehicle is in the third vehicle tilt state. Calculating means for calculating a weight of the vehicle based on the acquired first, second and third weights and the vehicle weight calculation formula; It has.

  According to this structure, it has the 1st, 2nd weighing scale which measures the weight on the 1st, 2nd wheel loading board from which height differs, and the front wheel was mounted on the 1st both wheel loading board. The first weight measured by the first weighing scale when the vehicle is in the first vehicle leaning state, and the second weight when the front wheel is in the second vehicle leaning state where the front wheels are placed on the second both-wheel loading plates. A second weight measured by the weigh scale, and a second weight measured by the first or second weight scale when the rear wheel is in a third vehicle tilt state on the first or second both-wheel loading plate. The vehicle weight is calculated based on the third weight and the vehicle weight calculation formula. Here, the vehicle weight calculation formula is the first equation created considering the balance of the moment of force when the vehicle is in the first leaning state, and the balance of the moment of force when the vehicle is in the leaning state. The vehicle tilts because it is derived from the second equation created in consideration of the balance and the third equation created in consideration of the balance of the moment of force when the vehicle is in the third leaning state. Therefore, the weight (total weight) of the vehicle can be accurately calculated.

  The vehicle weight measuring device of the present invention has a first both-wheel loading plate whose height from a horizontal road surface is a first height, and corresponds to a vertical load applied to the first both-wheel loading plate. And a second both-wheel loading plate having a first weighing scale for measuring a weight and a second both-wheel loading plate having a second height different from the first height from the road surface. A second weighing scale for measuring the weight according to the vertical load applied to the vehicle, and a state in which the left and right rear wheels of the vehicle are placed on the first both-wheel loading plate and the left and right front wheels of the vehicle are on the road surface One of the front and rear axles of the vehicle when the vehicle is in a horizontal state with the vehicle weight and the front and rear wheels of the vehicle on the road surface, assuming a first vehicle tilt state The horizontal distance between one axle and the center of gravity of the vehicle, and the vehicle from the road surface when the vehicle is in a horizontal state. The center height is an unknown and the distance between the front and rear axles of the vehicle, the first height of the first two-wheel loading plate, and the weight measured by the first weighing scale are known. As a number, the first equation showing the relationship between the three unknowns created considering the balance of the moment of force around the axis passing through the contact point between the left and right front wheels and the road surface, and the left and right rear wheels When the vehicle is in a horizontal state when the vehicle is placed on the second both-wheel loading plate and the left and right front wheels are on the road surface and the vehicle is in a horizontal state. The horizontal distance between the one axle and the center of gravity of the vehicle and the height of the center of gravity of the vehicle from the road surface when the vehicle is in a horizontal state are set as unknowns, and the inter-axis distance and the second two-wheel loading Measured by the second height of the plate and the second weighing scale. A second equation showing the relationship between the three unknowns, which is created taking into account the balance of the moment of force around the axis passing through the contact point between the left and right front wheels and the road surface, with the weight as a known number; When assuming a third vehicle inclination state in which the left and right front wheels are placed on the first or second both-wheel loading plate and the left and right rear wheels are on the road surface, the weight of the vehicle, The horizontal distance between the one axle when the vehicle is in a horizontal state and the center of gravity of the vehicle, and the height of the center of gravity of the vehicle from the road surface when the vehicle is in a horizontal state are unknowns, and the distance between the axes Measured by the first or second height, which is the height of the first or second both-wheel loading plate on which the front wheel is mounted, and the first or second weighing scale on which the front wheel is mounted The known weight and the left and right The weight of the vehicle derived based on the third equation showing the relationship between the three unknowns, which is created in consideration of the balance of the moment of force about the axis passing through the contact point between the rear wheel and the road surface. Storage means for preliminarily storing a vehicle weight calculation formula for calculating the vehicle weight, a first weight measured by the first weigh scale when the vehicle is in the first vehicle tilt state, and the vehicle Is measured by the second weighing scale when the vehicle is in the second vehicle leaning state, and by the first or second weighing scale when the vehicle is in the third vehicle leaning state. And calculating means for calculating the weight of the vehicle based on the acquired first, second and third weights and the vehicle weight calculation formula.

  According to this configuration, the first and second weighing scales for measuring the weight on the first and second wheel loading plates having different heights are provided, and the rear wheel is placed on the first both wheel loading plates. The first weight measured by the first weighing scale when the vehicle is in the first leaning state, and the second weight when the rear wheel is placed on the second both-wheel loading plate. The second weight measured by the two weighing scales, and the first or second weighing scale when the front wheels are in the third vehicle tilt state on the first or second both-wheel loading plate. The vehicle weight is calculated based on the third weight and the vehicle weight calculation formula. Here, the vehicle weight calculation formula is the first equation created considering the balance of the moment of force when the vehicle is in the first leaning state, and the balance of the moment of force when the vehicle is in the leaning state. Since the vehicle is derived based on the second equation that is created in consideration of the balance and the third equation that is created in consideration of the balance of the moment of force in the third vehicle tilt state, The weight of the vehicle (total weight) can be accurately calculated without including measurement errors due to tilting.

  Further, the storage means is further derived from the first equation, the second equation, and the third equation, and the center of gravity of the vehicle from the road surface when the vehicle is in a horizontal state. Is stored in advance, and the computing means is further based on the acquired first, second and third weights and the center of gravity height calculation formula. And the height of the center of gravity of the vehicle may be calculated. With this configuration, the height of the center of gravity of the vehicle can be calculated.

  Further, the storage means is further derived from the first equation, the second equation, and the third equation, the one axle in the horizontal state of the vehicle, and the vehicle A front-rear direction center-of-gravity position calculation formula for calculating a horizontal distance from the center of gravity is stored in advance, and the calculation unit further calculates the acquired first, second, and third weights and the front-rear direction center-of-gravity position. A horizontal distance between the one axle and the center of gravity of the vehicle may be calculated based on an equation. With this configuration, the position in the front-rear direction of the center of gravity of the vehicle can be obtained.

  Further, at least one of the first weighing scale and the second weighing scale detects a weight by supporting an end portion of the two-wheel loading plate on a side where the right wheel of the vehicle is placed. A right-side weight detection unit, a left-side weight detection unit that detects a weight by supporting an end portion of the two-wheel loading plate on a side on which the left wheel of the vehicle is mounted, and the right-side weight detection unit. And adding means for calculating a weight corresponding to a vertical load applied to the two-wheel loading plate by adding the weight detected by the left-side weight detection unit, and the calculating means further includes the vehicle Acquires the weight detected by any one of the right side weight detection unit and the left side weight detection unit when the vehicle is in any of the first, second, and third vehicle tilt states, and the acquired weight And when the vehicle is in the tilted state And weight corresponding to the vertical load applied to the wheels loading plate which is calculated by serial addition means, based on the width of the left and right wheels may be configured to determine the position of the center of gravity of the lateral direction of the vehicle. With this configuration, the center-of-gravity position in the left-right direction of the vehicle can be obtained.

  In addition, at least one of the first weighing scale and the second weighing scale includes the two-wheel loading plate, a right wheel loading plate on which a right wheel of the vehicle is mounted, and a left wheel of the vehicle. It is divided into a left wheel loading plate on which wheels are placed, and a right wheel weigh scale that measures the weight according to the vertical load applied to the right wheel loading plate, and according to the vertical load applied to the left wheel loading plate. You may be comprised so that it may have the left wheel scale for measuring a weight.

  Further, the calculation means further includes a weight corresponding to a vertical load applied to the right wheel loading plate acquired when the vehicle is in the first, second or third vehicle tilt state, and the left wheel loading plate. The center of gravity position in the left-right direction of the vehicle may be obtained based on the weight according to the applied vertical load and the width of the left and right wheels. With this configuration, the center-of-gravity position in the left-right direction of the vehicle can be obtained.

  In addition, when the height of the center of gravity of the vehicle calculated by the calculating means is higher than a predetermined height, a notifying means for notifying that may be further provided.

  The present invention has the above-described configuration, can easily change the installation location, and can provide a vehicle weight measuring device that can accurately measure the weight (total weight) of the vehicle. Play. In addition, there is an effect that it is possible to provide a vehicle weight measuring device that can calculate the height of the center of gravity of the vehicle.

(A) is a perspective view which shows schematic structure of the vehicle weight measuring device of the 1st Embodiment of this invention, (b) is the top view which looked at the measurement part of the vehicle weight measuring device from the top. (C) is a perspective view which shows the principal part which looked at the measurement part of the vehicle weight measuring device from the side. It is a block diagram which shows the structure of the vehicle weight measuring apparatus of the 1st Embodiment of this invention. It is a figure for demonstrating the calculation method of the vehicle gross weight etc. by the vehicle weight measuring device of the 1st Embodiment of this invention. It is a figure for demonstrating the calculation method of the vehicle gross weight etc. by the vehicle weight measuring device of the 1st Embodiment of this invention. It is a figure for demonstrating the calculation method of the vehicle gross weight etc. by the vehicle weight measuring device of the 1st Embodiment of this invention. It is a figure for demonstrating the calculation method of the vehicle gross weight etc. by the vehicle weight measuring device of the 1st Embodiment of this invention. (A) is a perspective view which shows schematic structure of the vehicle weight measuring device of the 2nd Embodiment of this invention, (b) is the top view which looked at the measurement part of the vehicle weight measuring device from the top. (C) is a perspective view which shows the principal part which looked at the measurement part of the vehicle weight measuring device from the side. It is a block diagram which shows the structure of the vehicle weight measuring apparatus of the 2nd Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout all the drawings, and redundant description thereof is omitted. Further, the present invention is not limited to the following embodiment.

(First embodiment)
FIG. 1A is a perspective view showing a schematic configuration of a vehicle weight measuring device according to a first embodiment of the present invention, and FIG. 1B is a top view of a measuring unit of the vehicle weight measuring device. FIG. 1C is a perspective view showing a main part of the measuring unit of the vehicle weight measuring device as viewed from the side. FIG. 2 is a block diagram showing the configuration of the vehicle weight measuring device of the present embodiment.

  The vehicle weight measuring device according to the present embodiment is a portable device in which the installation location can be easily changed. The measuring unit 1 installed on a flat, horizontal road surface 9 and the processing unit 6 supported by a column or the like. It has. The vehicle 10 to be measured in the present embodiment is a carriage that is pushed and moved by an operator such as a roll pallet, but is not limited thereto, and may be an automobile such as a truck. In FIG. 1A, for convenience of drawing space, the processing unit 6 is illustrated almost beside the measuring unit 1, but for example, when the rear wheel 12 of the vehicle 10 is placed on the measuring unit 1, Alternatively, when the rear wheel 12 of the vehicle 10 passes the measuring unit 1, the operator or driver who moves the vehicle 10 can see the measurement result (total vehicle weight, axle load, etc.) displayed on the display device 7, For example, you may arrange | position from the measurement part 1 in the front position of a vehicle advancing direction. Further, the processing unit 6 may be provided with a printer that prints the measurement result.

  The measuring unit 1 is arranged side by side in the traveling direction of the vehicle 10, and the two weighing scale bodies 2 and 3 on which the left and right wheels of the vehicle 10 are mounted, and the vehicle 10 is connected to the weighing scale body 2 from the road surface 9. An inclined portion SL1 for rising, an inclined portion SL2 for rising from the weighing scale body 2 to the weighing scale body 3, and an inclined portion SL3 for descending from the weighing scale body 3 to the road surface 9 are provided.

  The weighing scale body 2 includes a loading plate 21 on which the left and right wheels of the vehicle 10 are mounted, and two weight sensors 22 (22R, 22L) that support the loading plate 21 horizontally and detect a vertical load applied to the loading plate 21. And have. The loading plate 21 has a long plate shape, and the left and right wheels of the vehicle 10 are placed on both end portions in the longitudinal direction. The right weight sensor 22R is disposed so as to support one end portion in the longitudinal direction of the loading plate 21, that is, the end portion on the side on which the right wheel of the vehicle 10 is placed, from below, and the loading plate 21 The left weight sensor 22L is arranged so as to support the other end portion in the longitudinal direction, that is, the end portion on the side on which the left wheel of the vehicle 10 is placed from below. The right weight sensor 22R and the left weight sensor 22L are arranged symmetrically with respect to the center of the loading plate 21 in the longitudinal direction.

  Similarly, the weighing scale body 3 includes a loading plate 31 on which the left and right wheels of the vehicle 10 are mounted, and two weight sensors 32 (32R) that horizontally support the loading plate 31 and detect a vertical load applied to the loading plate 31. , 32L). The loading plate 31 has a long plate shape, and the left and right wheels of the vehicle 10 are placed on both end portions in the longitudinal direction. The right weight sensor 32R and the left weight sensor 32L that support the loading plate 31 are disposed in the same manner as the weight sensors 22R and 22L that support the loading plate 21, and are located with respect to the longitudinal center of the loading plate 31. Are arranged symmetrically.

  In the present embodiment, the height of the upper surface of the loading plate 31 of the weighing scale main body 3 is configured to be higher than the height of the upper surface of the loading plate 21 of the weighing scale main body 2. The weighing signals from the four weight sensors 22 and 32 are input to the control device 8. The weight sensors 22 and 32 are configured by a load cell or the like. The total weight detected by the two weight sensors provided in each of the weighing scale bodies 2 and 3 becomes the measured weight of each weighing scale m1 and m2 (FIG. 2).

  In addition, although each right side weight detection part of the weighing scales m1 and m2 was comprised by one weight sensor 22R and 32R, respectively, you may comprise by several weight sensors, respectively. Similarly, the left side weight detection unit of each of the weighing scales m1 and m2 is configured by one weight sensor 22L and 32L, respectively, but may be configured by a plurality of weight sensors.

  The processing unit 6 includes a display device 7 including, for example, a liquid crystal display that displays a measurement result on a screen, and a control device 8 in the housing.

  The control device 8 is configured by, for example, a microcomputer or the like, and includes addition means 8a and 8b, a calculation means 8c, a storage means 8M, and the like as shown in FIG. 2, and controls the display device 7. In the storage unit 8M, necessary information is stored in advance, and information appropriately calculated is stored. The adding means 8a sums the weight values indicated by the weighing signals of the two weight sensors 22, and outputs the summed weight value to the calculating means 8c. Similarly, the adding means 8b sums the weight values indicated by the weighing signals of the two weight sensors 32, and outputs the summed weight value to the calculating means 8c. The calculating means 8c calculates the total vehicle weight, front axle weight, rear axle weight, center of gravity position, etc., as will be described later, based on the weight values input from the adding means 8a, 8b.

  Here, the loading plate 21, the two weight sensors 22 and the adding means 8a constitute a first weighing scale m1 for obtaining a weight value corresponding to the vertical load applied to the loading plate 21, and the loading plate 31 and the two weights. The sensor 32 and the adding means 8b constitute a second weighing scale m2 for obtaining a weight value corresponding to the vertical load applied to the loading plate 31.

  A method of calculating the total vehicle weight and the like by the vehicle weight measuring device of the present embodiment will be described with reference to FIGS. In each figure of FIGS. 3-6, (a) shows an actual model and (b) shows a theoretical model.

First, FIG. 3A shows a state before the vehicle 10 is placed on the measuring unit 1, that is, a state where the front wheels 11 and the rear wheels 12 of the vehicle 10 are on the horizontal road surface 9 (hereinafter referred to as “vehicle horizontal state”). ). Here, the height (first height) H of the upper surface of the first loading plate 21 of the measuring unit 1 from the road surface 9 and the height (second height) of the upper surface of the second loading plate 31 from the road surface 9. The height H 'is a known value. The inter-axis distance L between the front axis and the rear axis of the vehicle 10 is also a known value. Then, the height from the center of gravity G of the road surface 9 of the vehicle 10 when the vehicle is horizontal state Z, the longitudinal direction of the horizontal distance between the rear axle of the center of gravity G and the vehicle 10 and X _1. Further, if the total weight of the vehicle 10 and W _G, as shown in the theoretical model of FIG. 3 (b), the total weight W _G acts on the center of gravity G. _Wherein, X _{1, Z, W G} is an unknown value. The point A in the theoretical model is a contact point between the rear wheel 12 and the road surface 9, and the point B is a contact point between the front wheel 11 and the road surface 9. An intersection point with a perpendicular line extending from the center of gravity G to the straight line AB is defined as a point C.

  Next, as shown in FIG. 4A, considering the state where the front wheel 11 of the vehicle 10 is placed on the first loading plate 21 and the rear wheel 12 is on the road surface 9 and is stopped, FIG. As shown in (b), the vehicle 10 is in a state where the front wheels 11 are higher than the rear wheels 12 and are inclined by an inclination angle θ with respect to the horizontal plane. In addition, in the theoretical model of FIG.4 (b), the inclination angle is enlarged and shown compared with the real model of Fig.4 (a) so that it may be easy to see. The same applies to FIGS. 5 and 6.

If the weight corresponding to the vertical load of the first loading plate 21 at this time is W _B, in FIG. 4 (b), acts weight W _B to point B, which is measured by the first weighing machine m1 (Calculated by the adding means 8a). Further, an intersection of a vertical line passing through the center of gravity G and the straight line AB is a point D, a distance between the point A and the point D is X ₂ , and a distance between the point D and the point C is X ₃ ,
X ₁ = X ₂ + X ₃
It is. Here, if X ₂ and X ₃ are expressed as in the following (Equation 1), X ₁ is represented by the expression (1). Equation (M1) is an equation for balancing the moment of force around the axis passing through the two contact points of the left and right rear wheels 12, 12 and the road surface 9, and in FIG. It can be said that this is the formula of the balance of moments.

  Next, as shown in FIG. 5 (a), considering a state in which the front wheel 11 of the vehicle 10 is placed on the second loading plate 31 and the rear wheel 12 is on the road surface 9 and is stopped, FIG. As shown in (b), the vehicle 10 is in a state where the front wheel 11 is positioned higher than the rear wheel 12 and is inclined by an inclination angle φ with respect to the horizontal plane.

If the weight corresponding to the vertical load applied to the second loading plate 31 at this time is WB _′ , the weight WB _′ acts on the point B in FIG. 5B, and this is the second weighing scale m2. (Calculated by the adding means 8b). Also, if the intersection of the vertical line passing through the center of gravity G and the straight line AB is point E, the distance between point A and point E is X ₄ , and the distance between point E and point C is X ₅ ,
X ₁ = X ₄ + X ₅
It is. Here, if X ₄ and X ₅ are expressed as in the following (Equation 2), X ₁ is expressed by the equation (2). Equation (M2) is an equation for balancing the moment of force around the axis passing through the two contact points between the left and right rear wheels 12, 12 and the road surface 9, and in FIG. It can be said that this is the formula of the balance of moments.

  Next, as shown in FIG. 6 (a), after the front wheel 11 of the vehicle 10 passes through the measuring unit 1, the rear wheel 12 is placed on the first loading plate 21 and the front wheel 11 is on the road surface 9. Considering the stopped state, as shown in FIG. 6B, the vehicle 10 is in a state where the rear wheel 12 is positioned higher than the front wheel 11 and is inclined by the inclination angle θ with respect to the horizontal plane.

If the weight corresponding to the vertical load of the first loading plate 21 at this time is W _A, in FIG. 6 (b), the weight W _A acts on the point A, which is measured by the first weighing machine m1 (Calculated by the adding means 8a). Further, if the intersection of the vertical line passing through the center of gravity G and the straight line AB is a point F, the distance between the point B and the point F is X ₆ , and the distance between the point F and the point C is X ₇ ,
X ₁ = L−X ₆ −X ₇
It is. Here, if X ₆ and X ₇ are expressed as in the following (Equation 3), X ₁ is expressed by the following equation (3). Equation (M3) is an equation for balancing the moment of force around the axis passing through the two contact points of the left and right front wheels 11, 11 and the road surface 9, and in FIG. It can be said that it is a formula of moment balance.

As shown in (Expression 7), which will be described later, tan θ in the above equations (1) and (3) can be expressed by the height H of the first loading plate 21 and the inter-axis distance L of the vehicle 10. The tanφ in the equation (2) can be expressed by the height H ′ of the second loading plate 31 and the inter-axis distance L of the vehicle 10. Therefore, Equation _(1), the unknowns _X 1, Z and _{W G,} corresponds to the equation of H, L and _{W B} with the known number, (2) _expression unknowns _X 1, Z and _{W G} and then, H a ', L and W _B' corresponds to the equation of a known number, equation _(3), the unknowns _X 1, Z and _{W G,} H, L and _{W a} in equations known number Equivalent to.

The above (1), (2), (3) Solving equation as simultaneous _equations, X 1, Z, can be determined _{W G.}

  For example, Equation (4) is obtained from Equation (1) and Equation (2) as shown in the following (Equation 4).

  Further, from the equations (1) and (3), the following equation (5) is obtained as in the following (Equation 5).

  Then, when the formula (4) is substituted into the formula (5) and rearranged, the following formula (6) is obtained.

  Furthermore, since tanθ and tanφ are expressed as in the following (Equation 7), if this is substituted into the equation (6) and rearranged, the calculation formula of Z shown in the equation (7) (the centroid height calculation equation) Is required.

Then, (4) in the expression above tan .theta, and arranging by substituting tanφ and Z, calculation formula of W _G indicated by the following equation (8) (vehicle weight calculation formula) is obtained.

Furthermore, (1) in the expression above tan .theta, and arranging by substituting Z and W _G, the calculation formula X ₁ represented by the following equation (9) (the front-rear direction center of gravity position calculation formula) is obtained.

That is, (8) the total weight W _G of the vehicle is calculated by the equation (9) horizontal distance X ₁ of the front-rear direction with the axis trailing the center of gravity G indicating the center of gravity of the front-rear direction by expression is calculated. Further, the height Z of the center of gravity G can be calculated by the equation (7).

Note that the degree of deviation S _FR of the center-of-gravity position in the front-rear direction of the vehicle can also be calculated as S _FR = X ₁ / L. In this case, when _SFR is 0.5, the position of the center of gravity is in the center between the axles, and when it is less than 0.5, the position of the center of gravity is rearward from the center between the axles and is greater than 0.5. The center of gravity is located forward from the center between the axles.

Further, the front axle weight W _f and the rear axle weight W _r are calculated by the following equations (10) and (11), respectively, using W _G and X ₁ calculated above.

In the control device 8, the equations (7) to (11) are stored in the storage unit 8M in advance, and the heights H and H ′ of the loading plates 21 and 31 and the axis of the vehicle to be measured The distance L is stored in the storage unit 8M. The computing means 8c, using height H, 'and a center distance L, _W B calculated by the adding means 8a, and _{W A,} W _B calculated by the adding means _8b' H and, Based on the equations (7) to (11), the values of Z, W _G , X ₁ , W _f and W _r are calculated.

In the present embodiment, provided with a weight meter 2 with different loading plate 21 and 31 in height, so obtaining the total weight W _G of the vehicle using a guided calculation formula from the simultaneous equations, respectively considering the inclination, It can be calculated accurately. Further, the front axle weight W _f and the rear axle weight W _r calculated using the accurate total weight W _G are also accurate values. In addition, since W _G and X ₁ are respectively expressed by the expressions (8) and (9), the expressions (8) and (9) are substituted for W _G and X ₁ in the expression (10). The front axle weight W _f may be calculated using a formula for calculating W _f , or W arranged by substituting the formulas (8) and (9) for W _G and X ₁ of the formula (11). _The rear axle weight W _r may be calculated using a formula for calculating _r .

As described above, in the present embodiment, the total weight W _{G of the} vehicle, the center of gravity G indicating the center of gravity in the front-rear direction and the horizontal distance X ₁ between the rear axis and the center of gravity indicating the center of gravity in the vertical direction (vertical direction). It is possible to derive an accurate value by deriving a calculation formula for calculating the height Z of G. Further, the front axle weight W _f and the rear axle weight W _r can also be accurately calculated using a calculation formula.

Then, the control device 8 displays the calculated value on the screen of the display device 7. FIG. 2 shows an example of the display screen 7a. In this example, the front axle weight W _f , the rear axle weight W _r, and the total weight W _G are indicated by numerical values, and the position of the center of gravity G is indicated by a black circle in the schematic diagram when the vehicle is viewed from the side. The position of the center of gravity in the front-rear direction and the height of the center of gravity are displayed. In addition, a message field is provided below the schematic diagram of the vehicle. When the calculated center of gravity height Z is higher than a predetermined height, the control device 8 displays, for example, “the center of gravity is high. "Is displayed.

  When measuring vehicles (roll pallets) of a plurality of vehicle types (types) having different inter-axis distances L, for example, RFID tags (wireless tags) storing the vehicle body type (vehicle type name) in each roll pallet to be measured ) And an RFID tag reader (refer to the RFID tag reader 5 in FIG. 7) is provided in the vicinity of the measuring unit 1, and the RFID tag reader reads out information on the vehicle body form from the RFID tag and provides it to the control device 8. To do. Then, the control device 8 stores the inter-axis distance L for all types of vehicles to be measured in the storage unit 8M, and the calculation unit 8c provides information on the vehicle type (vehicle type name) given from the RFID tag reader. What is necessary is just to comprise so that the distance L between axes | shafts corresponding to may be read from the memory | storage means 8M.

  In the present embodiment, a roll pallet has been described as an example of a vehicle. However, an apparatus for measuring the weight of an automobile such as another cart and a truck can be similarly configured.

  When the vehicle weight measuring device according to the present embodiment is configured as a device for measuring a truck, for example, the control device 8 determines whether the calculated center of gravity height Z is higher than a predetermined height. For example, a message that calls attention is displayed on the screen of the display device 7, for example, a message such as “Be careful about driving because the center of gravity is high”. In addition, a lamp is provided for notifying the driver that the height Z of the center of gravity is higher than a predetermined height, and when the height Z of the center of gravity is higher than the predetermined height, the control device 8 causes the lamp to May be lit.

  Moreover, when using the vehicle weight measuring apparatus of this embodiment, for example, in order to measure the truck which loads and ships the product produced in the factory, the control apparatus 8 uses all the height Z of the measured center of gravity of the vehicle. The average value (height average value) of the stored center-of-gravity height Z is calculated, and the value of the center-of-gravity height Z of the vehicle currently measured is the above-mentioned height average. When the value is larger than the predetermined value (x) by more than a predetermined value, a message that calls attention to the truck driver as described above, for example, a message such as “Be careful about driving because the center of gravity is high” is displayed on the display device 7. To be displayed on the screen. Further, as described above, a lamp for notifying the driver that the height Z of the center of gravity is high may be provided, and the control device 8 may turn on the lamp. The predetermined value (x) may be, for example, a standard deviation σ of the height Z of the center of gravity used for calculating the average height value, and may be a value of the average height value + 2σ, or by another method. It may be a predetermined value.

  Note that when measuring a plurality of types of trucks having different inter-axis distances L, for example, each of the trucks to be measured is measured as in the case of measuring a plurality of types of vehicles (roll pallets) having different inter-axis distances L. The RFID tag reader (refer to the RFID tag reader 5 in FIG. 7) is provided in the vicinity of the measuring unit 1, and the control device 8 is all measured. The storage unit 8M stores the inter-axis distance L for the vehicle of the vehicle type, and the calculation unit 8c stores the inter-axis distance L corresponding to the vehicle type (vehicle type) information given from the RFID tag reader from the storage unit 8M. What is necessary is just to comprise so that it may read. When measuring only a track with the same inter-axis distance L, such as a truck of the same vehicle type, the inter-axis distance L of the vehicle type may be stored in the storage unit 8M in advance.

Even when measuring a cart such as a roll pallet or when measuring a car such as a truck, when measuring only a vehicle having the same inter-axis distance L such as the same vehicle type, Since the inter-axis distance L is a constant value, the following values of k1 to k6 are obtained in advance, and instead of the equations (7) to (9), the following equations (12) to (14) May be used to calculate Z, W _G , and X ₁ .

In the present embodiment, the weight W _B of the front wheel 11 is measured by the weight meter m1 when the state of being placed on the first loading plate 21 vehicle 10 is advanced toward the measuring unit 1, further When the front wheel 11 moves forward and the front wheel 11 is placed on the second loading plate 31, the weight WB _′ measured by the weight meter m 2 further advances and the rear wheel 12 moves onto the first loading plate 21. the calculation formula using the weight W _a, which is measured by the weigh scale m1 when loaded was _state, Z, W G, but to calculate the X _1, not limited to this.

For example, a weight W _B of the front wheel 11 is measured by the weight meter m1 when the state of being placed on the first loading plate 21 vehicle 10 is advanced toward the measuring unit 1, the front wheels further forward 11 And the weight WB _′ measured by the weight meter m2 when the vehicle is placed on the second loading plate 31, and the rear wheel 12 is placed on the second loading plate 31 by further moving forward. when the weight measured by the weight meter m2 in (W _{a ')} and _{Z using,} W G, by the calculation formula of _{X 1, Z,} W G, may be configured to calculate the _{X 1.}

Alternatively, the weight W _B of the front wheel 11 is measured by the weight meter m1 when the state of being placed on the first loading plate 21 vehicle 10 is advanced toward the measuring unit 1, the rear wheel is further advanced 12 state and the weight W _a as measured by gravimeter m1, the rear wheel 12 and further advances are placed on the second loading plate 31 in a state that is placed on the first loading plate 21 when the weight measured by the weight meter m2 in (W _{a ')} and _{Z using,} W G, by the calculation formula of _{X 1, Z,} W G, may be configured to calculate the _{X 1.}

Alternatively, when the vehicle 10 moves forward toward the measuring unit 1 and the front wheel 11 is placed on the second loading plate 31, the weight WB _′ measured by the weighing scale m2 and further forward condition wheel 12 and a weight W _a, which is measured by the weigh scale m1 when the state of being placed on the first loading plate 21, the rear wheel 12 and further advances have been placed on the second loading plate 31 _Z and using a weight (W _{a ')} measured by the weight meter m2 _when, W G, by the calculation formula of _{X 1, Z,} W G, may be configured to calculate the _{X 1} .

Each calculation formula of Z, W _G , and X ₁ in each of the above cases is obtained when the above-described calculation formulas (7), (8), and (9) are obtained, for example, as shown in FIG. The equations (1), (2), and (3) that are established in the respective states shown in FIG. 5 (a) and FIG. 6 (a) are created and obtained by solving these as simultaneous equations. This can be obtained in the same manner as in this case.

Further, in the present embodiment, as the distance that indicates the gravity center position in the longitudinal direction of the vehicle 10, but using the horizontal distance X ₁ front-rear direction of the rear axle of the center of gravity G and the vehicle 10 when the vehicle horizontal state, the vehicle horizontal it may be configured to use a front-rear direction of the horizontal distance _{X f (= L-X 1} ) of the front axle of the center of gravity G and the vehicle 10 in the state.

(Second Embodiment)
FIG. 7A is a perspective view showing a schematic configuration of the vehicle weight measuring device according to the second embodiment of the present invention, and FIG. 7B is a top view of the measuring unit of the vehicle weight measuring device. FIG. 7C is a perspective view showing a main part of the measuring unit of the vehicle weight measuring device as viewed from the side. FIG. 8 is a block diagram showing the configuration of the vehicle weight measuring device of the present embodiment. In FIG. 7A, the processing unit 6 is illustrated beside the measuring unit 1A for convenience of drawing space. However, for example, a vehicle 10 such as a truck passes through the measuring unit 1A and passes from the measuring unit 1A. What is necessary is just to arrange | position the process part 6 in the position which can see the measurement result (vehicle gross weight, axle weight, etc.) displayed on the display apparatus 7 from drivers, such as a truck, when getting off. Further, the processing unit 6 may be provided with a printer that prints the measurement result.

  Similarly to the first embodiment, the vehicle weighing scale side device of the present embodiment is a portable device in which the installation location can be easily changed. In the present embodiment, in the measuring unit 1A, the weighing scale body 2 in the first embodiment is divided into two weighing scale bodies 2a and 2b that independently measure the weights of the left and right wheels. In this embodiment, the weighing scale body 3 is divided into two weighing scale bodies 3a and 3b that independently measure the weights of the left and right wheels.

  Specifically, the weighing scale body 2a includes a loading plate 21a on which the right wheel is placed, and four weight sensors 22a that horizontally support the loading plate 21a and detect a vertical load applied to the loading plate 21a. The weighing scale main body 2b includes a loading plate 21b on which the left wheel is placed, and four weight sensors 22b that horizontally support the loading plate 21b and detect a vertical load applied to the loading plate 21b. Similarly, the weight main body 3a includes a loading plate 31a on which the right wheel is placed, and four weight sensors 32a that horizontally support the loading plate 31a and detect a vertical load applied to the loading plate 31a. The weight main body 3b includes a loading plate 31b on which the left wheel is placed, and four weight sensors 32b that horizontally support the loading plate 31b and detect a vertical load applied to the loading plate 31b.

  The heights of the upper surfaces of the two loading plates 21a and 21b are the same, and the heights of the upper surfaces of the two loading plates 31a and 31b are the same. And it is comprised so that the height of the upper surface of the loading plates 31a and 31b may be higher than the height of the upper surface of the loading plates 21a and 21b.

  The weighing signals of the weight sensors 22a, 22b, 32a, 32b are input to the control device 8. The weight sensors 22a, 22b, 32a, 32b are configured by load cells or the like. The total weight detected by the four weight sensors provided in each weighing scale body 2a, 2b, 3a, 3b becomes the measured weight of each weighing scale m11, m12, m21, m22 (FIG. 8).

  The control device 8 is constituted by, for example, a microcomputer or the like, and includes addition means 81 to 84, a calculation means 85, a storage means 8M, and the like as shown in FIG. In the storage unit 8M, necessary information is stored in advance, and information appropriately calculated is stored. The adding means 81 sums the weight values indicated by the weighing signals of the four weight sensors 22a and outputs the summed weight value to the computing means 85. Similarly, the adding means 82 sums the weight values indicated by the weighing signals of the four weight sensors 22 b and outputs the summed weight value to the calculating means 85. Similarly, the adding unit 83 sums the weight values indicated by the weighing signals of the four weight sensors 32 a and outputs the summed weight value to the calculating unit 85. Similarly, the adding means 84 sums the weight values indicated by the weighing signals of the four weight sensors 32 b and outputs the summed weight value to the computing means 85.

The computing unit 85 adds weight values input from the two adding units 81 and 82, thereby obtaining weight values (for example, W _B and W _A ) corresponding to the output values of the adding unit 8a in the first embodiment. calculate. Also, by adding the weight values input from the two adding means 83 and 84, a weight value (for example, W _{B ′} ) corresponding to the output value of the adding means 8b in the first embodiment is calculated. Then, the calculation means 85 calculates the total vehicle weight, front axle weight, rear axle weight, position of the center of gravity, etc., as will be described later, as in the first embodiment.

  Here, the loading plate 21a, the four weight sensors 22a, and the adding means 81 constitute a first right wheel weight meter m11 for obtaining a weight value corresponding to the vertical load applied to the loading plate 21a, and the loading plate 21b. The four weight sensors 22b and the adding means 82 constitute a first left wheel weigh scale m12 for obtaining a weight value corresponding to the vertical load applied to the loading plate 21b. Further, the loading plate 31a, the four weight sensors 32a, and the adding means 83 constitute a second right wheel weigh scale m21 for obtaining a weight value corresponding to the vertical load applied to the loading plate 31a. The two weight sensors 32b and the adding means 84 constitute a second left wheel weighing scale m22 for obtaining a weight value corresponding to the vertical load applied to the loading plate 31b.

  In the present embodiment, although not shown, the vehicle 10 to be measured is equipped with an RFID tag (wireless tag) that stores the vehicle body type (vehicle model name), and the RFID is located in the vicinity of the measurement unit 1A. A tag reader 5 is provided. The RFID tag reader 5 reads information on the vehicle body type of the vehicle 10 from the RFID tag and gives it to the control device 8. Then, in the control device 8, vehicle information such as the inter-axis distance L and the width of the left and right wheels (the distance between the centers of the left and right wheels) I for all the vehicle types to be measured is stored in the storage unit 8M. The calculation means 85 is configured to read the inter-axis distance L of the vehicle 10 and the width I of the left and right wheels corresponding to the information on the vehicle body type (vehicle type name) given from the RFID tag reader.

  When the vehicle weight measuring device of the present embodiment is used to measure only the track having the same distance L and the left and right wheel widths I, such as a truck of the same vehicle type, the distance L between the axle and the left and right If the wheel width I is stored in the storage unit 8M in advance, the RFID tag and the RFID tag reader 5 to be mounted on the vehicle 10 are unnecessary.

  A method for calculating the total vehicle weight and the like by the vehicle weight measuring device of the present embodiment will be described with reference to FIGS.

In the control device 8, as in the case of FIG. 4 (a), when the front wheel 11 of the vehicle 10 is placed on the loading plates 21a and 21b, the adding means 81 calculates the weight W _{BR of the} right front wheel applied to the loading plate 21a. the weight _{W BL} of the left front wheel acting on the loading plate 21b addition means 82 calculates the weight _{W B} of the first embodiment and the calculated value of the calculating means 85 are two addition means 81 and 82 sum (addition) calculate.

Further, in the control device 8, as in the case of FIG. 5A, when the front wheel 11 of the vehicle 10 is placed on the loading plates 31a and 31b, the adding means 83 adds the weight W _{BR ′} of the right front wheel applied to the loading plate 31a. The adding means 84 calculates the weight W _{BL ′} of the left front wheel that is calculated and applied to the loading plate 31b, and the calculating means 85 sums (adds) the calculated values of the two adding means 83 and 84 in the first embodiment. The weight WB _′ is calculated.

Further, the control device 8, as in the case of FIG. 6 (a), when rear wheel 12 of the vehicle 10 is placed on the loading plate 21a, 21b, adds the weight _{W AR} of the right rear wheel applied to the loading plate 21a means 81 And the adding means 82 calculates the weight W _AL of the left rear wheel applied to the loading plate 21b, and the calculating means 85 sums (adds) the calculated values of the two adding means 81 and 82 in the first embodiment. to calculate the weight _{W a} in.

Then, further calculating means 85, W _B calculated as described _above, by using the W B _'and W _A, as in the first embodiment, calculates the height Z of the center of gravity G by the equation (7), (8) calculates the total weight W _G of the vehicle by type, it calculates the X ₁ (horizontal distance front-rear direction of the rear axle and the center of gravity G) position of the center of gravity of the longitudinal direction by (9).

Further, the front axle weight W _f and the rear axle weight W _r are calculated by the equations (10) and (11), as in the first embodiment, using W _G and X ₁ calculated above.

Furthermore, the calculation means 85 calculates the load (wheel weight) applied to each wheel as follows. The weight according to the load applied to the left front wheel (left front wheel weight) is W _fL , the weight according to the load applied to the right front wheel (right front wheel weight) is W _fR , and the weight according to the load applied to the left rear wheel (left rear wheel) Weight) is W _rL , and the weight according to the load applied to the right rear wheel (right rear wheel weight) is W _rR .

W _fL = W _f · W _BL / W _B
W _fR = W _f · W _BR / W _B
W _rL = W _r · W _BL / W _B
W _rR = W _r · W _BR / W _B
The above _{W fL,} in the calculation equation of _{W rL,} instead of W BL / _{W B,} may be used _{W BL '/ W B'} or _W AL / _{W A. Further,} W _fR, the calculation formula of _{W rR,} instead of _W BR / W _B, may be used _{W BR '/ W B'} or _W AR / _{W A.}

Furthermore, the calculation means 85 calculates the center-of-gravity position in the left-right direction of the vehicle as follows. If a value indicating the barycentric positions of the left and right direction, for example the lateral direction of the distance Y _R of the right wheel and the center of gravity G, for example, Y _R indicating the barycentric positions of the left and right directions of the vehicle using any of the following equation Is calculated.

Y _R = I · W _BL / (W _BL + W _BR )
Y _R = I · W _{BL ′} / (W _{BL ′} + W _{BR ′} )
Y _R = I · W _AL / (W _AL + W _AR )
Here, the width I of the left and right wheels is the same for the front wheel and the rear wheel, and the distance between the center of the left and right wheels of the front wheel or the rear wheel and the center of the right and left wheels is the width I. Yes.

Incidentally, the deviation degree S _LR of the center of gravity of the lateral direction of the vehicle, for example, may be calculated deviation degree S _LR of the center of gravity of the lateral direction of the vehicle using any of the following equation.

S _LR = W _BL / (W _BL + W _BR )
S _LR = W _{BL ′} / (W _{BL ′} + W _{BR ′} )
S _LR = W _AL / (W _AL + W _AR )
In this case, when S _LR = Y _R / I and S _LR is 0.5, the center of gravity position is in the center in the left-right direction of the vehicle, and when it is less than 0.5, the center of gravity position is in the left-right direction of the vehicle. If the center of gravity is greater than 0.5, the position of the center of gravity is located to the left from the center in the left-right direction of the vehicle.

In the present embodiment, as in the first embodiment, the total weight W _{G of the} vehicle, the distance indicating the center of gravity position in the front-rear direction (for example, the horizontal distance X _{1 in} the front-rear direction between the center of gravity G and the rear shaft), the vertical direction can be accurately calculated using the height Z of the center of gravity G indicating the position of the center of gravity of the (vertical direction), the front axle weight W _f and rear axle weight W _r the calculation formula. Further, the left front wheel weight W _fL , the right front wheel weight W _fR , the left rear wheel weight W _rL , the right rear wheel weight W _rR, and the right and left distance Y between the right wheel and the center of gravity G indicating the left and right center of gravity position. _R can be calculated. Therefore, in addition to the height of the center of gravity of the vehicle (the position of the center of gravity in the vertical direction) and the position of the center of gravity in the front-rear direction, the center of gravity position in the left-right direction can also be calculated. That is, the three-dimensional center of gravity position of the vehicle can be obtained.

Then, the control device 8 displays the calculated value on the screen of the display device 7. FIG. 8 shows an example of the display screen 71. In this example, the left front wheel weight (front shaft left) W _fL , the right front wheel weight (front shaft right) W _fR , the left rear wheel weight (rear shaft left) W _rL , the right rear wheel weight (rear shaft right) W _rR , It shows front axle weight W _f, a rear axle weight W _r and the total weight W _G numerically, the position of the center of gravity G is the center of gravity G to each of the schematic view seen from behind and schematic view of the vehicle from the side The positions are indicated by black circles so that the position of the center of gravity in the front-rear direction, the position of the center of gravity in the left-right direction, and the height of the center of gravity can be grasped. In addition, a message field is provided below the schematic diagram of the vehicle, and the control device 8 displays, for example, a display when the calculated three-dimensional center of gravity position of the vehicle is out of a predetermined range for each vehicle type. A message for alerting the driver, for example, a message “the center of gravity is high at the rear side of the right side. Be careful about driving.” Is displayed on the screen of the device 7. The predetermined range for each vehicle type is a range that is a predetermined distance away from the ideal center-of-gravity position of the vehicle type in the front-rear direction, the left-right direction, and the vertical direction, and is stored in the storage unit 8M in advance. Yes.

  In the first embodiment, for example, when configured as a device for measuring a track, a message indicating that the center of gravity is high is displayed on the screen of the display device 7 or the lamp is turned on. In this embodiment, a similar message may be displayed or the lamp may be turned on.

Also in the second embodiment, when measuring only vehicles having the same inter-axis distance L, such as the same vehicle type, the inter-axis distance L is a constant value. ), Z, W _G , and X ₁ may be calculated using the above-described equations (12) to (14).

  In the second embodiment, the two weighing scales m11 and m12 may be replaced with one weighing scale m1 as in the first embodiment, or the two weighing scales m21 and m22 may be the same as those in the first embodiment. Even if it replaces with one such weighing scale m2, the total weight of the vehicle, the front axle weight, the rear axle weight, the load applied to each wheel, and the three-dimensional center of gravity position of the vehicle can be obtained. This is clear from the calculation method described above.

  In the first embodiment, at least one of the two weighing scales m1 and m2 may be divided into two weighing scales as in the second embodiment. When the weighing scale m1 is divided into two weighing scales m11 and m12, the added value of the output values of the two adding means 81 and 82 becomes the output value of the adding means 8a of the weighing scale m1, and the weighing scale m2 is When divided into two weighing scales m21 and m22, the added value of the output values of the two adding means 83 and 84 becomes the output value of the adding means 8b of the weighing scale m2.

In the first embodiment, for example, a weighing signal of either one of the two weight sensors 22 or two of the two weight sensors 32 is input to the calculating means 8c, and the calculating means 8c is as follows. Thus, the center of gravity position in the left-right direction of the vehicle may be calculated. In this case, as in the case of the second embodiment described above, if the value indicating the center of gravity position in the left-right direction is the distance Y _R between the right wheel and the center of gravity G in the left-right direction, for example, one of the following calculating a Y _R indicating the barycentric positions of the left and right direction of the vehicle using the equation.

Y _R = I · W _BL1 / W _B (15)
Y _R = I · W _{BL1 ′} / W _{B ′} (16)
Y _R = I · W _AL1 / W _A (17)
In the above formula, I is the width of the left and right wheels, as in the case of the second embodiment described above, and the calculation means 8c is the same as in the case where the inter-axis distance L of the vehicle 10 is acquired. The width I is obtained. Further, equation (15), when configured to input the weight sensor 22L of the weighing signals of the left operation unit 8c, W _B is 4 the front wheels 11 of the vehicle 10 is on the loading plate 21 ( a weight value adding unit 8a in the state outputs of a), W _BL1 is the weight value indicated by the weight sensor 22L of the weighing signals of the left at the same conditions. Further, the equation (16) is a case where the weighing signal of the left weight sensor 32L is configured to be input to the calculation means 8c, and WB _′ is the case where the front wheel 11 of the vehicle 10 is placed on the loading plate 31. The weight value output by the adding means 8b in the state (a) is W _{BL1 ′} , which is the weight value indicated by the weighing signal of the left weight sensor 32L in the same state. Further, formula (17), when configured to input the weight sensor 22L of the weighing signals of the left operation unit 8c, W _A is rear wheels 12 of the vehicle 10 is on the loading plate 21 6 The weight value output by the adding means 8a when in the state (a), and _WAL1 is the weight value indicated by the weighing signal of the left weight sensor 22L in the same state.

  The center-of-gravity position in the left-right direction of the vehicle calculated as described above is such that the center position in the left-right direction of the vehicle 10 is the center in the left-right direction of the loading plates 21, 31 when the vehicle 10 is placed on the loading plates 21, 31. Therefore, it is preferable that the vehicle 10 is placed on the loading plates 21 and 31 so that the center position in the left and right direction of the vehicle 10 is as close to the center of the loading plates 21 and 31 as possible.

Further, as for the deviation degree S _LR of the center of gravity position in the left-right direction of the vehicle, as in the case of the second embodiment described above, for example, one of the following equations is used as S _LR = Y _R / I Can be calculated.

S _LR = W _BL1 / W _B
S _LR = W _{BL1 ′} / W _{B ′}
S _LR = _W AL1 / _{W A}
The weighing signal of the right weight sensor 22R or 32R is configured to be input to the calculation means 8c, and the center of gravity position of the vehicle 10 in the left-right direction is calculated as the distance in the left-right direction between the left wheel and the center of gravity G. You may do it. Also in this case, the degree of deviation may be calculated in the same manner.

  In the first embodiment, the height of the second loading plate 31 is higher than that of the first loading plate 21. However, the height of the first loading plate 21 is higher than that of the second loading plate 31. You may comprise so that the height may become high. Similarly, in 2nd Embodiment, you may comprise so that the height of the loading plates 21a and 21b may become higher than the loading plates 31a and 31b.

  In addition, although it is not a portable device, in the first embodiment, either the first loading plate 21 or the second loading plate 31 is embedded to be the same height as the road surface 9 (that is, the road surface 9 The height H or H ′ from the head may be 0). Similarly, in the second embodiment, any one of the loading plates 21a and 21b and the loading plates 31a and 31b is embedded to have the same height as the road surface 9 (that is, the height H or H ′ from the road surface 9 is 0).

  INDUSTRIAL APPLICABILITY The present invention is useful as a vehicle weight measuring device that can accurately measure the total weight of a vehicle and the like.

2, 2a, 2b, 3, 3a, 3b Weigh scale 21, 21a, 21b, 31, 31a, 31b Loading plate 22, 22a, 22b, 32, 32a, 32b Weight sensor 7 Display device 8 Control device 8a, 8b Addition means 8c, 85 calculation means 8M storage means 9 road surface

Claims (8)

A first weighing scale having a first both-wheel loading plate whose height from a horizontal road surface is a first height, and measuring a weight according to a vertical load applied to the first both-wheel loading plate;
A second both-wheel loading plate having a second height different from the first height from the road surface is measured, and the weight according to the vertical load applied to the second two-wheel loading plate is measured. A second weighing scale;
When assuming a first vehicle inclination state in which the left and right front wheels of the vehicle are placed on the first both-wheel loading plate and the left and right rear wheels of the vehicle are on the road surface, A horizontal distance between one of the front axle and the rear axle of the vehicle and the center of gravity of the vehicle when the vehicle's front and rear wheels are on a road surface, and the vehicle horizontal state; The height of the center of gravity of the vehicle from the road surface is unknown, the distance between the front and rear axles of the vehicle, the first height of the first two-wheel loading plate, and the first The relationship between the three unknowns created by taking into account the balance of moments of force around the axis passing through the contact point between the left and right rear wheels and the road surface, with the weight measured by the weighing scale of The first equation shown and the left and right front wheels are the second two-wheel loading plates On the road surface, the weight of the vehicle, the one axle in the horizontal state of the vehicle, and the vehicle The horizontal distance from the center of gravity and the height of the center of gravity of the vehicle from the road surface when the vehicle is in a horizontal state are unknowns, the inter-shaft distance, the second height of the second two-wheel loading plate, The three unknowns that are created in consideration of the balance of the moment of force about the axis passing through the contact point between the left and right rear wheels and the road surface, with the weight measured by the second weighing scale as a known number. Assuming a second equation indicating the relationship between the left and right rear wheels and the third vehicle tilt state in which the left and right front wheels are on the road surface with the left and right rear wheels mounted on the first or second both-wheel loading plate. The weight of the vehicle and the level of the vehicle The horizontal distance between the one axle and the center of gravity of the vehicle when the vehicle is in an unknown state and the height of the center of gravity of the vehicle from the road surface when the vehicle is in a horizontal state are unknowns, and the inter-axis distance and the rear wheel Is measured by the first or second weight, which is the height of the first or second both-wheel loading plate on which the vehicle is mounted, and the first or second weighing scale on which the rear wheel is mounted. Based on the third equation showing the relationship between the three unknowns, which is created taking into account the balance of the moment of force around the axis passing through the contact point between the left and right front wheels and the road surface, with the weight as a known number Storage means for preliminarily storing a vehicle weight calculation formula for calculating the weight of the vehicle,
A first weight measured by the first weighing scale when the vehicle is in the first vehicle tilt state, and a second weight scale measured when the vehicle is in the second vehicle tilt state And a third weight measured by the first or second weighing scale when the vehicle is in the third vehicle tilt state, and the obtained first and second weights are obtained. A vehicle weight measuring device comprising: calculating means for calculating the weight of the vehicle based on the second and third weights and the vehicle weight calculation formula. A first weighing scale having a first both-wheel loading plate whose height from a horizontal road surface is a first height, and measuring a weight according to a vertical load applied to the first both-wheel loading plate;
A second both-wheel loading plate having a second height different from the first height from the road surface is measured, and the weight according to the vertical load applied to the second two-wheel loading plate is measured. A second weighing scale;
When assuming a first vehicle inclination state in which the left and right rear wheels of the vehicle are placed on the first both-wheel loading plate and the left and right front wheels of the vehicle are on the road surface, A horizontal distance between one of the front axle and the rear axle of the vehicle and the center of gravity of the vehicle when the vehicle's front and rear wheels are on a road surface, and the vehicle horizontal state; The height of the center of gravity of the vehicle from the road surface is unknown, the distance between the front and rear axles of the vehicle, the first height of the first two-wheel loading plate, and the first The relationship between the three unknowns created taking into account the balance of the moment of force around the axis passing through the contact point between the left and right front wheels and the road surface is shown, with the weight measured by the weighing scale of the vehicle as a known number. The first equation and the left and right rear wheels are the second two-wheel loading plates Assuming a second vehicle leaning state in which the left and right front wheels are on the road surface, the weight of the vehicle, the one axle in the horizontal state of the vehicle, and the center of gravity of the vehicle And the height of the center of gravity of the vehicle from the road surface when the vehicle is in a horizontal state are unknowns, the inter-axis distance, the second height of the second two-wheel loading plate, The relationship between the three unknowns created by considering the balance of the moment of force around the axis passing through the contact point between the left and right front wheels and the road surface, with the weight measured by the second weighing scale as a known number. Assuming a second equation indicating the vehicle and a third vehicle tilt state in which the left and right front wheels are placed on the first or second wheel loading plate and the left and right rear wheels are on the road surface In the weight of the vehicle and the horizontal state of the vehicle The horizontal distance between the one axle and the center of gravity of the vehicle when the vehicle is in the horizontal direction and the height of the center of gravity of the vehicle from the road surface when the vehicle is in a horizontal state are unknowns. A first or second height which is a height of the first or second both-wheel loading plate placed thereon, and a weight measured by the first or second weighing scale on which the front wheel is placed; As a known number, and based on a third equation showing the relationship between the three unknowns, which is created in consideration of the balance of moments of force about the axis passing through the contact point between the left and right rear wheels and the road surface. Storage means for preliminarily storing a derived vehicle weight calculation formula for calculating the weight of the vehicle;
A first weight measured by the first weighing scale when the vehicle is in the first vehicle tilt state, and a second weight scale measured when the vehicle is in the second vehicle tilt state And a third weight measured by the first or second weighing scale when the vehicle is in the third vehicle tilt state, and the obtained first and second weights are obtained. A vehicle weight measuring device comprising: calculating means for calculating the weight of the vehicle based on the second and third weights and the vehicle weight calculation formula. The storage means
Further, for calculating the height of the center of gravity of the vehicle from the road surface derived from the first equation, the second equation, and the third equation when the vehicle is in a horizontal state. The center of gravity height calculation formula is stored in advance,
The computing means is
The height of the center of gravity of the vehicle is further calculated based on the acquired first, second and third weights and the center of gravity height calculation formula. Vehicle weight measuring device. The storage means
Further, a horizontal distance between the one axle and the center of gravity of the vehicle, which is derived based on the first equation, the second equation, and the third equation when the vehicle is in a horizontal state, is calculated. Pre-stored longitudinal centroid position calculation formula for
The computing means is
And a horizontal distance between the one axle and the center of gravity of the vehicle based on the acquired first, second, and third weights and the longitudinal center-of-gravity position calculation formula. Item 3. The vehicle weight measuring device according to Item 1 or 2. At least one of the first weight scale and the second weight scale is:
A right side weight detection unit for detecting a weight by supporting an end part of a side on which the right wheel of the vehicle is mounted on the two-wheel loading plate;
A left-side weight detection unit that detects a weight by supporting an end portion of the two-wheel loading plate on a side on which the left wheel of the vehicle is mounted;
Adding means for calculating the weight according to the vertical load applied to the two-wheel loading plate by adding the weight detected by the right weight detector and the weight detected by the left weight detector;
The computing means is
Furthermore, when the vehicle is in any one of the first, second, or third vehicle leaning state, the weight detected by any one of the right side weight detection unit and the left side weight detection unit is acquired, Based on the acquired weight, the weight according to the vertical load applied to the two-wheel loading plate calculated by the adding means in any one of the vehicle tilt states, and the width of the left and right wheels, Configured to determine the center of gravity in the left-right direction,
The vehicle weight measuring device according to claim 1 or 2. At least one of the first weight scale and the second weight scale is:
The both wheel loading plates are divided into a right wheel loading plate on which the right wheel of the vehicle is placed and a left wheel loading plate on which the left wheel of the vehicle is placed, and is added to the right wheel loading plate. The right wheel weigher for measuring the weight according to the vertical load and the left wheel weigher for measuring the weight according to the vertical load applied to the left wheel loading plate. 2. The vehicle weight measuring device according to 2. The computing means is
Further, the weight according to the vertical load applied to the right wheel loading plate and the weight according to the vertical load applied to the left wheel loading plate acquired when the vehicle is in the first, second or third vehicle tilt state. And the center of gravity of the vehicle in the left-right direction is determined based on the widths of the left and right wheels.
The vehicle weight measuring device according to claim 6.   The vehicle weight measuring device according to claim 3, further comprising notification means for notifying when the height of the center of gravity of the vehicle calculated by the calculation means is higher than a predetermined height.

Images