JP2007155410A - Calibrating method for vehicle-use load weight detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a span calibrating method for a load weight detecting device, which can carry out a calibration easily in a cargo-carrying vehicle equipped with the load weight detecting device within the vehicle itself. <P>SOLUTION: The calibrating method is applied to the vehicle-use load weight detecting device which has weight detecting means on the rear wheel shaft side and the front wheel side respectively, sums detection values detected by these weight detecting means and meters the total weight and the load weight. The simple span calibrating method comprises: storing a vehicle total weight obtained by loading all wheels of the vehicle in its loaded state with on-vehicle matters on a track scale which is laid on a travel road of the vehicle, and metering it; at the same time, storing the detection values detected by the weight detecting means on the front shaft side and the weight detecting means on the rear shaft side; at an arbitrary time thereafter, acquiring a span factor by comparing the stored detection values of the weight detecting means with values metered by the track scale; and carrying out a simple span calibration of the weight detecting means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for calibrating a vehicle loading weight detection device, and more particularly, to a loading weight detection device mounted on an environmental sanitary vehicle such as a garbage collection vehicle, a water supply / watering vehicle, a vacuum car, or a freight transport vehicle such as a truck or a dump truck. It is easy to calibrate.

  In the case of a freight carrying vehicle, if it is operated with so-called overloading in which the loaded weight is exceeded, the operation of the brakes will be impaired, leading to troubles in driving operations, leading to traffic accidents as well as deterioration of the vehicle and the road surface. It also contributes to damage. Therefore, the load weight on the loading platform is legally restricted and obligated by the vehicle operation regulations.

In general, a truck scale is used as a means for measuring the load carrying weight for a freight transport vehicle. However, the truck scale is a large-scale device, which requires equipment costs and a large installation space. Therefore, in recent years, instead of weighing with a truck scale, a loaded weight detection device that is mounted on a vehicle and measures the loaded weight is provided.
Conventionally provided load weight detection devices are equipped with detectors that measure the deflection of the front and rear axles, and the load weight is measured from the total output of each detector. When the load weight detection device is attached to the vehicle itself as described above, it is necessary to periodically inspect and calibrate the load detection means in order to maintain accuracy.

  As a calibration method for this type of loading weight detection apparatus, Japanese Patent Application Laid-Open No. 2004-198176 (Patent Document 1) provides a calibration apparatus shown in FIG. In this apparatus, when a load is loaded on the vehicle 1, a self-weighing scale 2 that measures the load amount based on the load data from the load sensor 3 that changes according to the amount of distortion of the axle is mounted on the vehicle 1. At the time of calibration, the vehicle 1 is placed on the mat scale 4 for measuring the vehicle weight, and then the vehicle 1 is jacked up by the jack 5 to reduce the vehicle weight on the mat scale 4 to a desired reduction amount. The calibration data is displayed in comparison with the load data output from the load sensor 3 and the reference load data, and the self-weight scale 2 is calibrated based on the calibration information.

JP2004-198176

  However, in the method of Patent Document 1, a mat scale must be arranged when performing span calibration, and a large installation space is required. In addition, the vehicle must be jacked up with a jack while measuring the decrease in the vehicle weight on the mat scale, which increases the burden on the operator and increases the work time, resulting in a lack of practicality.

  It is also possible to calibrate the weighing value obtained by the load detection means mounted on the vehicle by comparing it with the weighing value measured on the track scale. For example, in a garbage collection vehicle, the calibration is performed on a truck scale installed at the entrance of the treatment plant, but before the entrance to the waste treatment plant, the waste is collected and waiting for the opening of the treatment plant. Vehicles lined up and entered the treatment plant at the same time when the gates were opened. Therefore, if the calibration is performed on the track scale, a traffic jam occurs and cannot be adopted.

The present invention has been made in view of the above problems, and in a vehicle for cargo transportation or the like equipped with a load detection device for detecting a load weight on the vehicle itself, Simply measure the total weight of the vehicle on the track scale and store the measured value. Then, at any time, you can easily measure the load detection device mounted on the vehicle using the measured value of the stored track scale. The challenge is to make it possible.
Specifically, for example, in a garbage collection vehicle, an empty vehicle after dumping dust is stored by storing an actual measurement value that passes through a truck scale installed at the entrance of the dumping disposal site and is measured by the truck scale. Even after entering the state, at any time, the measured value based on the track scale is compared with the load detection value mounted on the vehicle so that simple span calibration can be performed.

In order to solve the above problem, the present invention includes load detection means on each of the rear wheel shaft side and the front wheel shaft side, and adds the detection values detected by these load detection means to measure the total weight and the loaded weight. A method for calibrating a vehicle load weighing device,
The total weight of the vehicle measured by placing all the wheels of the vehicle on a truck scale laid on the vehicle travel path in the loaded state is stored, and at the same time, the load detection means on the front wheel shaft side and the load on the rear wheel shaft side are stored. The detection value detected by the detection means is stored, and at any time thereafter, the stored detection value of the load detection means is compared with the measured value based on the track scale to obtain a span coefficient, thereby simplifying the load detection means. Provided is a method for calibrating a vehicle load weight detection apparatus, characterized by performing span calibration.

Specifically, at the time of initial setting, only the front wheel shaft side and only the rear wheel shaft side are placed on the truck scale in the empty state where no load is loaded and in the loaded state where the load is loaded, respectively. The vehicle body weight on the rear wheel shaft side and the total weight when loaded are measured, and the total vehicle empty weight (tare weight) is obtained and recorded from these measured values, and the rear wheel shaft side and the front wheel shaft are recorded. The load detection means on the side is zero adjusted in the empty state and span adjusted in the loaded state.
The simple calibration at the time of use stores the total weight of the vehicle measured by placing all the wheels of the vehicle on the track scale in the loaded state, and also stores the detection values detected by the load detection means on the front wheel shaft side and the rear wheel shaft side. Aside,
At any later time, the calculated weight value of the vehicle is obtained by adding the stored load weights on the rear wheel shaft side and the front wheel shaft side and the empty vehicle weight recorded at the time of the initial setting to obtain the calculated value of the total vehicle weight. And the weight value of the gross vehicle weight measured and stored on the track scale, or the load weight obtained by adding the detected values on the rear wheel shaft side and the front wheel shaft side, and the track weight. The span coefficient is obtained by comparing the weight of the load obtained by subtracting the tare weight from the total vehicle weight.

In the simple calibration, the total weight of the vehicle measured by placing all the wheels of the vehicle on a truck scale laid on the vehicle traveling path in a loaded state is stored and recorded in a memo or weighing slip, and the front axle The displacement detected by the load detection means on the side and rear wheel shaft side is stored in a computer,
Preferably, at any later time, the stored record is input to a computer and the computer performs the comparison operation to obtain a span coefficient.

That is, at the time of initial setting, the weight is measured on the truck scale, and the vehicle body weight on the front wheel shaft side and the vehicle body weight on the rear wheel shaft side in the empty state are measured. In addition, the weight on the front wheel shaft side (body weight on the front wheel shaft side + loading weight on the front wheel shaft side) and the total weight on the rear wheel shaft side (body weight on the rear wheel shaft side + rear wheel shaft) with a load such as a weight loaded Side load weight). The vehicle body weight (tare weight) of the entire vehicle is obtained from these measured values and stored in a computer mounted on the vehicle. In addition, zero adjustment and span adjustment of the front wheel shaft side load detection means and the rear wheel shaft side load detection means are performed in advance.
Thereafter, the load of the vehicle load during normal use is measured from the load detection means on the front wheel shaft side and the load detection means on the rear wheel shaft side mounted on the vehicle.
In addition, the loaded vehicle passes, for example, on a truck scale installed at the entrance of the treatment plant in a garbage truck, and the total weight of the vehicle is measured on the truck scale.
At that time, on the truck scale, the weight of the empty vehicle body (tare weight) is subtracted from the total weight of the vehicle measured on the truck scale to obtain the load weight, and the weight is measured by the load detection means mounted on the vehicle itself. If calibration work is performed based on the weight of the loaded object, it will take time, and traffic congestion will occur on the truck scale.
Therefore, a memorandum of measurement value or a weighing slip is stored on the track scale, and at the same time, the displacement amount and load amount of the load detecting means mounted on the vehicle at the time of weighing at the track scale are also stored.
It is convenient for the operator when the weighing value stored on the track scale stored in the memo etc. is not on the track scale but when the vehicle is getting off the track scale, or when the load is unloaded. Weighing by track scale by inputting to computer at any time and calculating the span coefficient by computer processing from the detection value of load detecting means on the rear wheel shaft side and front wheel shaft side stored in advance by computer The simple span calibration of the load detection means mounted on the vehicle can be performed from the value.
Note that span calibration refers to adjusting the load detection means so that the load converted from the output value of the load detection means becomes a correct value without error.

  The structure of the load detection means on the front wheel shaft side and the rear wheel shaft side mounted on the vehicle is not limited. For example, a load cell for on-vehicle weight measurement disclosed in Japanese Patent Application Laid-Open No. 2004-69323 related to the application of the present applicant, It may be a weight measuring instrument that detects the amount of axle displacement disclosed in Japanese Patent No. 6259041 as a voltage with a voltage converter.

Thus, according to the calibration method of the present invention, simple calibration of the load detection means on the rear wheel shaft side and the front wheel shaft side mounted on the vehicle is performed using the track scale laid on the traveling path of the vehicle, By storing and memorizing the total weight of the vehicle weighed on this track scale in a memo, etc., it is installed in the vehicle by entering the track scale measured value stored at any time into a computer and using it. Simple span calibration of the load detection means can be easily performed at any convenient time, not on the track scale.
In this way, when the truck scale is installed in a place where the vehicles are crowded, any calibration time is not performed on the truck scale, and after leaving the truck scale, further any time during emptying after unloading In addition, it is possible to calibrate the span of the load detection means mounted on the vehicle by using the measured value on the track scale, and to prevent the occurrence of traffic congestion on the track scale.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 9 show an embodiment of the present invention.
FIG. 1 shows a garbage truck 10 equipped with a load weight detecting means according to the present invention.

  The garbage collection vehicle 10 includes a long cargo bed frame (vehicle body frame) 12 extending in the front-rear direction including a part of the rear portion of the driver's seat cabin 11, and a dust collection container 13 is placed on the cargo bed frame 12. A pair of left and right front wheels 14 are disposed on the lower front part of the loading frame 12, and a pair of left and right rear wheels 15 are disposed on the lower lower side of the loading frame 12. The axle 20 of the front wheel 14 and the axle 22 of the rear wheel 15 are respectively suspended. It is elastically supported on the cargo bed frame 12 side via 16F and 16R.

One rear wheel shaft side load detection means 40 between the axle 22 of the pair of left and right rear wheels 15 and the loading frame 12, and one front wheel shaft side between the axle 20 of the pair of left and right front wheels 14 and the loading frame 12. Load detecting means 50 is mounted.
Signals from the rear wheel shaft side and front wheel shaft side load detecting means 40 and 50 are transmitted via a cable to a computer 38 installed in the driver's seat cabin 11, and a calculation result in the computer 38 is supplied to the driver's seat cabin 11. The display 39 is provided with a numerical value or an image.

In the present embodiment, the rear wheel shaft side and front wheel shaft side load detection means 40, 50 measure the displacement of the axle 20 of the front wheel 14 and the axle 22 of the rear wheel 15, and convert this displacement into a voltage value. The rear wheel shaft sensor 31 and the front wheel shaft sensor 36, each of which includes a direct acting displacement-voltage converter, will be described in detail later.
In addition, the structure of the load detection means 40 and 50 attached to the rear wheel shaft side and the front wheel shaft side is not limited, and a load cell may be used.

FIG. 2 is a block diagram showing the connection relationship between the load detection means 40, 50 and the computer 38 and display 39 mounted on the vehicle.
The load detection means 40, 50 are provided with a rear wheel shaft sensor and a front wheel shaft sensor composed of linear displacement-voltage converters 31, 36, and connected to measurement amplifiers 37A, 37B for amplifying the voltage values of these voltage converters, These measurement amplifiers 37A and 37B are connected to the A / D converter 65, and the amplified digital signal is transmitted from the A / D converter 65 to the computer 38, and the displacement measured by the direct acting displacement-voltage converters 31 and 36. Data is transmitted to the computer 38.
The computer 38 calculates a front wheel shaft side load, a rear wheel shaft side load, a total weight that is the sum of them, and a load amount that is the weight of only the load based on the received voltage values of the displacement data of the front wheel shaft and the rear wheel shaft. A switch 38b for switching display and storing data, a digital switch for setting calibration data or a setting unit 38c combining a display and a switch for increasing / decreasing numbers, and a recording unit 38d for storing and calculating calibration data and tare. I have.
The display unit 39 displays the total weight of the loaded load calculated by the calculation processing unit 38a as a numerical value or an image, and at the same time, when it is determined that the vehicle is overloaded compared with the allowable load weight defined for each vehicle, It indicates that it is overloaded by flashing a light or a lamp.

The configurations of the rear wheel shaft side load detecting means 40 and the front wheel shaft side load detecting means 50 will be described in detail below.
As shown in FIG. 3, the rear wheel shaft side load detection means 40 fixes an L-shaped horizontal support member 25 to the horizontal surface of the rear side portion of the pair of left and right cargo bed frames 12 extending in the front-rear direction. The upper end of the vertical connecting plate 30 is pivotally attached to the vertical surface 25a of the material 25 by a support shaft P1. The lower end of the vertical connecting plate 30 is pivotally attached to a pivot arm 29 supported rotatably at a roll center via a support shaft P2. The upper end of a linear displacement-voltage converter (potentiometer) 31 is rotatably attached to the horizontal support member 25 by a support shaft P3 at an inner position in the vehicle width direction than the vertical connecting plate 30. The lower end is pivotally attached to the pivot arm 29 by a support shaft P4, and the displacement-voltage converter 31 is attached in parallel to the vertical connecting plate 30.

  As shown in FIG. 4, the details of the connecting structure between the horizontal support member 25 and the loading platform frame 12 are provided at the lower end of the L-shaped frame 41 fixed in the vertical direction to the vertical outer surface of the loading platform frame 12. The L-shaped horizontal support member 25 is fixed to the connecting hole 42a of the L-shaped frame 42 with bolts and nuts. The upper ends of the vertical connection plate 30 and the linear displacement-voltage detector 31 are pivotally attached to predetermined positions of a plurality of connection holes 25b formed in the vertical surface 25a of the horizontal support member 25.

The pivot arm 29 is supported by a roll center O of a gate-shaped bracket 27 that is attached at both left and right positions sandwiching the roll center O with respect to a casing 21 that houses an axle 20 attached between a pair of left and right rear wheels 15. It is rotatably supported by P5.
Specifically, the left and right mounting shafts 27a and 27b of the bracket 27 are bolted to a pair of left and right suspensions 16R connected to the casing 21 of the axle 20, and a portal-shaped center is formed at the inner ends of the left and right mounting shafts 27a and 27b. The connecting portion 27c is connected. The central connecting portion 27 c is separated from the front side of the axle 20, and the central connecting portion 27 c of the bracket 27 is positioned at a position where it does not interfere with the differential gear box 17 disposed at the center of the axle 20. The center of the pivot arm 29 in the longitudinal direction is pivotally attached to the roll center O of the central connecting portion 27c by a support shaft P5, and the support shaft P5 serves as a rotation fulcrum of the pivot arm 29.
A displacement-voltage converter 31 is connected to the pivot arm 29 on the right side in FIG. 3 from the roll center O, and a vertical connection plate 30 is connected to the outside thereof.
The linear motion type displacement-voltage converter 31 accommodates a connecting arm 31 a having an upper end connected to the horizontal support member 25 in an outer cylinder 31 b so as to be movable up and down, and connects the outer cylinder 31 b to a pivot arm 29. The pivot arm 29 is configured to follow the displacement according to the load.

The front wheel shaft side load detection means 50 has the configuration shown in FIG. 5 and is substantially the same as the rear wheel shaft side load detection means 40.
An L-shaped horizontal support member 32 fixed to the front horizontal surface of the left and right cargo bed frames 12, and the upper end of the vertical connecting plate 35 on the vertical surface 32a of the horizontal support member 32 is rotatably supported by a support shaft P1 '. The lower end of the vertical connecting plate 35 is rotatably attached to the pivot arm 34 by a support shaft P2 ′. At the inner position in the vehicle width direction from the vertical connecting plate 35, the upper end of the direct acting displacement-voltage converter 36 is rotatably attached to the horizontal support member 32 by the support shaft P3 ′, and the lower end is The pivot arm 34 is rotatably mounted on a support shaft P4 ′, and the displacement-voltage converter 36 is attached in parallel to the vertical connecting plate 35.
The pivot arm 34 is pivotally supported by a roll center O with respect to a bracket 24 that is fitted and fixed to a casing 23 that accommodates the axle 22, and an inner end in the vehicle width direction is rotatably supported by a support shaft P5 '. The lower end of the vertical connecting plate 35 and the lower end of the direct acting displacement-voltage converter 31 are rotatably mounted on the outer end of the pivot arm 34, and these are arranged in parallel.

In the vehicle equipped with the load detection means 40, 50, the load carrier frame 12 resists the elastic supporting force of the suspensions 16R, 16F as the dust is introduced into the dust collection container 13, as shown by dotted lines in FIGS. The position is moved downward from the position indicated by に to the position indicated by the solid line.
With the downward displacement of the load carrier frame 12, the horizontal support members 25 and 32 of the rear wheel shaft side load detection means 40 and the front wheel shaft side load detection means 50 are lowered and moved downward with respect to the road surface E in a horizontal posture. The downward movement of the horizontal support members 25 and 32 is transmitted to the pivot arms 29 and 34 through the vertical movement of the vertical connecting plates 30 and 35, and the pivot arms 29 and 34 pivot about the fulcrum set at the roll center O. Rotate. At this time, the direct acting displacement-voltage converters 31 and 36 interposed so as to maintain a parallel relation with the vertical connecting plates 30 and 35 are lowered in accordance with the downward displacement amount of the loading frame 12 in the vertical plane direction. The displacement amount is detected as a voltage value.

Next, a method for calibrating the load detecting means 40 and 50 having the above-described configuration will be described with reference to the flowchart of FIG. 6 and schematic explanatory diagrams of FIGS.
In the initial setting, as shown in FIG. 7A, only the front wheels 14 are put on the track scale 60 and the front wheel shaft side total weight Lf0 is weighed in an empty loading state in which no load is loaded on the vehicle. Next, as shown in FIG. 7B, only the rear wheel 15 is mounted on the track scale 60, and the rear wheel shaft side total weight Lr0 is measured and recorded. Further, the front wheel shaft side displacement Xf0 and the rear wheel shaft side displacement Xr0 are detected by the load detection means 40, 50 on the front wheel shaft side and the rear wheel shaft side, and the switch 38b of the computer 38 is operated to cause the recording unit 38d to move to the front wheel shaft side displacement. Xf0 and rear wheel shaft side displacement Xr0 are stored. (Step S1)

  Next, with the load (weight, etc.) 100 of the required weight loaded, as shown in FIG. 8 (A), only the front wheel 14 is placed on the track scale 60 and the front wheel shaft side total weight Lf1 is measured. As shown in FIG. 8B, only the rear wheel 15 is mounted on the track scale 60, and the rear wheel shaft side total weight Lr1 is measured and recorded. Further, the front wheel shaft side displacement Xf1 and the rear wheel shaft side displacement Xr1 are detected by the load detection means 40, 50 on the front wheel shaft side and the rear wheel shaft side, and the switch 38b of the computer 38 is operated so that the front wheel shaft side displacement Xf1 Further, the rear wheel shaft side displacement Xr1 is stored. (Step S2)

  Furthermore, the front wheel shaft side and rear wheel shaft side total weights Lf0 and Lr0 in the empty loading state measured and recorded in step S1 and step S2, and the front wheel shaft side and rear wheel shaft side total weights Lf1 and Lr1 in the loading state, empty loading On the basis of the front wheel shaft and rear wheel shaft displacements Xf0, Xr0 in the state and the front wheel shaft displacements Xf1, Xr1 in the loaded state, the following arithmetic expression (1) is constructed by the arithmetic processing unit 38a of the computer 38, And the total vehicle weight (tare weight) are obtained and stored in the recording unit 38d of the computer 38.

Formula (1 )
Front wheel shaft side total weight LF = {(Lf1-Lf0) / (Xf1-Xf0)} * (Xf-Xf
0) + Lf0
Rear wheel shaft side total weight LR = {(Lr1-Lr0) / (Xr1-Xr0)} × (Xr-Xr
0) + Lr0
Total vehicle weight LF + LR
Loading weight LF + LR-Ln0
Here, Xf and Xr are front wheel shaft side and rear wheel shaft side displacements measured during actual use. (Step S3)

  By performing the above initial setting, the zero points of the load detection means 40, 50 are set to the front wheel shaft side and rear wheel shaft side total weights Lf0, Lr0 and the front wheel shaft side and rear wheel shaft side displacements Xf0, Xr0 in the empty load state, The span is set to the front wheel shaft side and rear wheel shaft side total weights Lf1 and Lr1 and the front wheel shaft side and rear wheel shaft side displacements Xf1 and Xr1 in the loaded state.

During normal use, the load weight is measured using the front wheel shaft side load detection means 50 and the rear wheel shaft side load detection means 40 mounted on the vehicle.
During this use, as described below, the measured value of the total vehicle weight (body weight + loading weight) obtained when the entire loaded vehicle is weighed on the truck scale 60, and the front wheel shaft side mounted on the vehicle When the difference in the calculated value of the total weight obtained from the load weight detected by the load detection means 50, 40 on the rear wheel shaft side becomes obvious, simple span calibration of the load detection means 40, 50 is performed.

That is, as shown in FIG. 9, in the loaded state, the entire vehicle is placed on the track scale 60 laid on the ground, and the total vehicle weight Lg01 measured by the track scale 60 is noted, or the weighing slip is recorded. Keep it. (Step S4)
At the same time, the switch 38b of the computer 38 is pressed, and the rear wheel shaft side displacement Xr01 and the front wheel shaft side displacement Xf01 detected by the load detection means 40, 50 are stored in the storage unit 38d of the computer 38. (Step S5)
As described above, the total vehicle weight Lg01 is stored, and the rear wheel shaft side displacement Xr01 and the front wheel shaft side displacement Xf01 are measured and stored in the recording unit 38d. So that simple calibration can be performed at any time.

At the time of any subsequent simple span calibration, the total vehicle weight Lg01 weighed on the track scale stored in the memo or weighing slip is input to the setting device 38c of the computer 38. (Step S6)
The arithmetic processing unit 38a of the computer 38 obtains the loaded weight from the rear wheel shaft side displacement Xr01 and the front wheel shaft side displacement Xf01 stored in the storage unit 38d, and sums the loaded weight and the empty vehicle weights Lf0 and Lr0 obtained at the initial setting. By calculating, the total weight calculation values LF01 and LR01 on the front wheel shaft side and the rear wheel shaft side are obtained, and the span coefficient K is obtained from the following calculation formula (2). (Step S7)

Formula (2 )
Front wheel shaft side total weight calculation value LF01 = {(Lf1-Lf0) / (Xf1-Xf0)} × (
Xf01−Xf0) + Lf0
Rear wheel shaft side total weight calculation value LR01 = {(Lr1-Lr0) / (Xr1-Xr0)} × (
Xr01−Xr0) + Lr0
Span coefficient K = Lg01 / (LF01 + LR01)
As previously mentioned,
Lf1, Lr1 are front wheel shaft side and rear wheel shaft side total weights after loading. Xf1, Xr1 are front wheel shaft and rear wheel shaft side displacements after loading. Lf0, Lr0 are front wheel shaft side and rear wheel shaft side total weights before loading (when empty). Xf0 and Xr0 are the front wheel axle and rear wheel axle displacement before loading (when empty)

  The simple span calibration of the load detection means 40, 50 on the rear wheel shaft side and the front wheel shaft side is performed with the obtained span coefficient K.

Using the span coefficient K obtained in the calculation formula (2), the computer 38 constructs the following new calculation formula (3).
At the time of use after simple span calibration, the total vehicle weight and the loaded weight are obtained by the calculation formula (3). (Step S8)

Formula (3 )
Front wheel shaft side total weight LF01 = K × {(Lf1-Lf0) / (Xf1-Xf0)} × (X
f01−Xf0) + Lf0
Rear wheel shaft side total weight LR01 = K × {(Lr1−Lr0) / (Xr1−Xr0)} × (X
r01−Xr0) + Lr0
Total vehicle weight LF01 + LR01
Loading weight LF01 + LR01-Ln0
Xr01 and Xf01 are front wheel shaft side and rear wheel shaft side displacements measured during actual use.

With the above configuration, zero setting and span calibration of the load detection means 40 and 50 on the front wheel shaft side and the rear wheel shaft side are carried out by weighing on the track scale at the time of initial setting, and the vehicle weight is set in the setting device 38c of the computer 38. By memorizing (tare weight), it is only necessary to memorize the total weight measured on the track scale 60 and record the detected values of the load detecting means 40 and 50 at the time of simple calibration. After that, simple calibration can be performed at a time convenient for the operator.

  In actual use conditions, when a load (2000 kg to 4000 kg) is loaded from the time of empty loading, it is detected by the load detection means 40, 50 (front wheel axis sensor, rear wheel axis sensor) on the rear wheel axis side and the front wheel axis side. The total load amount, total weight (total load amount + total vehicle body weight), rear wheel shaft side load amount, and front wheel shaft side load amount voltage (A / D value) are within the display range shown in FIG.

  In the above-described embodiment, the span calibration in the case where the loaded weight detection device is attached to the garbage collection vehicle has been described. However, it can be easily performed by any environmental transportation vehicle such as a vacuum car, a water supply / watering vehicle, or any cargo transport vehicle such as a truck or a dump truck. Span calibration can be performed.

1 is a schematic side view of a freight transport vehicle equipped with a load weight detection device according to the present invention. It is a block diagram of the loading weight detection apparatus which concerns on this invention. It is a front view which shows the structure of the rear-wheel axle load detection means which concerns on this invention. FIG. 4 is a perspective view of a main part of the rear wheel shaft side load detecting means of FIG. 3. It is a front view of the principal part explaining the structure and attachment state of a front wheel shaft side load detection means. It is a flowchart explaining the calibration method of a loading weight detection apparatus. It is a front view in the empty loading state at the time of initial setting, (A) is a diagram in which only the front wheels are mounted on the track scale, (B) is a diagram in which only the rear wheels are mounted on the truck scale. It is. It is a front view in the loading state at the time of initial setting, (A) is a diagram in which only the front wheels are mounted on the truck scale, (B) is a diagram in which only the rear wheels are mounted on the truck rack scale. is there. It is a front view which has mounted both wheels on the truck rack in the loaded state at the time of simple span calibration. It is a diagram which shows the practical example of the relationship between the loading capacity and display voltage in the load detection apparatus of this invention. It is a figure of a prior art example.

Explanation of symbols

10 Garbage Collection Vehicle 12 Cargo Frame 13 Dust Collection Containers 16R, 16F Suspension 20 Rear Wheel Axle 22 Front Wheel Axle 31 Rear Wheel Axis Direct Acting Displacement-Voltage Converter (Rear Wheel Axle Sensor)
36 Front wheel shaft direct acting displacement-voltage converter (front wheel shaft sensor)
38 Computer 39 Display 40 Rear wheel shaft side load detecting means 50 Front wheel shaft side load detecting means 60 Track scale

Claims (3)

This is a method for calibrating a load weight weighing device for a vehicle that includes load detection means on each of the rear wheel shaft side and the front wheel shaft side, and adds the detection values detected by these load detection means to measure the total weight and load weight. And
The simple span calibration stores the total weight of the vehicle measured by placing all the wheels of the vehicle on a truck scale laid on the vehicle traveling path in the loaded state of the load, and at the same time, the load detection means on the front wheel shaft side and The detection value detected by the load detection means on the rear wheel shaft side is stored, and at any time thereafter, the stored detection value of the load detection means and the measured value by the track scale are compared to obtain a span coefficient, A calibration method for a vehicle load weight detection apparatus, wherein a simple span calibration of a load detection means is performed. At the initial setting, the front wheel axle side and the rear wheel axle side at the time of empty vehicle are put on the truck scale with only the front wheel axle side and only the rear wheel axle side mounted in the empty state where no load is loaded and the loaded state where the load is loaded. The vehicle body weight and the total weight at the time of loading are measured, and the total vehicle empty weight (tare weight) is obtained and recorded from these measured values, and the load detection on the rear wheel shaft side and the front wheel shaft side is performed. Perform zero adjustment in the empty state and span adjustment in the loaded state.
The simple calibration at the time of use stores the total weight of the vehicle measured by placing all the wheels of the vehicle on the track scale in the loaded state, and also stores the detection values detected by the load detection means on the front wheel shaft side and the rear wheel shaft side. Aside,
At any later time, the calculated weight value of the vehicle is obtained by adding the stored load weights on the rear wheel shaft side and the front wheel shaft side and the empty vehicle weight recorded at the time of the initial setting to obtain the calculated value of the total vehicle weight. And the weight value of the gross vehicle weight measured and stored on the track scale, or the load weight obtained by adding the detected values on the rear wheel shaft side and the front wheel shaft side, and the track weight. The method for calibrating a vehicle load weight detection apparatus according to claim 1, wherein the span coefficient is obtained by comparing the load weight obtained by subtracting the tare weight from the total vehicle weight. In the simple calibration, the total weight of the vehicle measured by placing all the wheels of the vehicle on the truck scale in the loaded state is stored and recorded in a memo or weighing slip, and the load detection on the front wheel shaft side and the rear wheel shaft side is performed. The displacement detected by the means is stored in a computer mounted on the vehicle,
3. The calibration method for a vehicle load weight detection apparatus according to claim 2, wherein the stored record is inputted to a computer at any time thereafter, and the comparison calculation is performed by the computer to obtain a span coefficient.

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