JP3009098B2 - Vehicle load measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the load weight of a vehicle for accurately and simply measuring the load weight of a load such as luggage on a dump box or a carrier in a dump truck or truck.

[0002]

2. Description of the Related Art Overloading of cargo such as luggage in vehicles such as dump trucks and trucks is strictly regulated by road traffic methods and other laws and regulations. ) Is attached to the rear part of the side surface of the chassis (a part close to the rear wheels), and by checking the weight value of the weighing scale, the proper loading is performed.

[0003]

However, since the conventional weighing scale is attached to the rear part of the side of the chassis, it cannot be visually checked in the cab. Otherwise, the confirmation work has to be troublesome and troublesome because other people have to check it. In addition, the conventional weight measurement using a weighing scale is performed by an approximate calculation of a form in which a characteristic curve of a reference weight is referred to, so that a problem also arises in terms of accuracy.

In a vehicle without a weighing scale,
The entire vehicle is put on a large weighing scale to measure the total weight, and the actual weight is measured by subtracting the vehicle weight in a state where there is no load from the measured value. For this reason, the measuring device is large and expensive, and there is an inconvenience of having to go to a place where the measuring device is installed and performing the measurement twice, so that the measurement cannot be performed easily and simply.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to enable a driver to check the loaded weight of a vehicle visually in a driver's cab, while sitting in a driver's seat, and to accurately and simply perform the operation. It is an object of the present invention to provide a loading weight measuring device capable of measuring the loading weight of a vehicle.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a load weight measuring device of the vehicle, the object of the present invention, the dump cylinder sensor (load sensor) which is provided between the dump truck chassis and dump box and a switch means which operates when the dump box is dumped up to a height of any <br/>, and dump angle measuring means for measuring the dump angle, the dump cylinder sensor when said switching means is actuated
A cab that calculates and displays the load weight of the load loaded on the dump box based on the output signal and the dump angle of the dump box
And calculation display means installed therein , wherein the calculation display means comprises:
The following load weight calculation method to be achieved by Rukoto.

[0007] The calculating and displaying means calculates the weight of the load.
M, the load detected by the dump cylinder sensor is M1,
Α is the dump angle detected by the dump angle measuring means, and the dump is
The distance between the support part and the dump cylinder is L2, and the dump load
When the distance between the center of gravity of the dump and the bottom of the dump is h, M =
Loaded as M1 / (1 / 2−h / L2 · tanα)
Is calculated and displayed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a dump truck 1 equipped with a loading weight measuring device of the present invention. A dump cylinder sensor 10 for measuring the load weight is provided, and a pressure sensor (load sensor) 20 is provided on the support shaft 4 of the dump box 2. The operation of the operation unit in the cab 5 causes the dump cylinder to operate with hydraulic pressure, so that the dump box 2
Dump down. In the operator's cab 5, a display 3 for displaying the weight value of the load loaded on the dump box 2 calculated based on the dump cylinder sensor 10 and the pressure sensor 20.
0 is provided. The pressure sensor 20, the dump cylinder sensor 10, and the like can be retrofitted to an existing vehicle.

FIG. 2 shows an example of the configuration of the present invention. The measurement signals M 1 and M 2 of the dump cylinder sensor 10 and the pressure sensor 20 are input to a calculation unit 40. The arithmetic unit 40 includes a data input unit 50 of an operation panel installed in the cab 5.
The weight of the dump box 2, parameters required for calculation, etc. are input, and the dump angle of the dump box 2 is input from the angle detector 60, so that the dump angle becomes a predetermined value (for example, 5 °). When this happens, the calculation unit 40 calculates the load weight, and displays the calculated load weight AM on the display 30 such as a liquid crystal display.

The dump cylinder sensor 10 has a form in which a pressure sensor is screwed into an oil flow line of the dump cylinder, and converts the oil pressure into a load to output an electric signal (M1). Alternatively, the pressure signal may be converted into a load by the calculation unit 40. The relationship between the oil pressure and the load can be determined in advance, but generally has a linear relationship. The configuration of the pressure sensor 20 is as shown in FIG. 3, and an oil nipple 21 is provided in an oil flow passage formed between the support shaft 4 of the dump box 2 and the chassis-3.
It is provided with a screw-in type. By providing the pressure sensor 20 so that the sensor unit faces the oil 22 in the oil flow path, the entire load (including the load) of the dump box 2 applied to the oil 22 via the support shaft 4 can be reduced by the pressure sensor 2.
It can be measured at zero.

The data input unit 50 is provided at an appropriate position in the operator's cab 5, and is provided with a dump box 2 with no load.
, And parameters necessary for calculation described later. The dump box 2 is dumped up / down through a dump cylinder by operating the operation panel, and its angle is detected by an angle detector 60 such as an encoder or a potentiometer and input to the arithmetic unit 40. You.
The calculation unit 40 detects that the detection angle of the angle detector 60 has reached a predetermined value, and starts calculation based on the detection signal. A voice or the like may be output in parallel with the operation or calculation. The operation method according to the present invention will be described below.

The load M of the load loaded on the dump box 2
FIG. 4 shows the relationship between the detected loads M1 and M2 of the dump cylinder sensor 10 and the pressure sensor 20, and the dump angle at this time is α. The relationship between the dump angle α, the dump height D, and the length L1 is as shown in Equation 1.

[0013]

[Equation 1] sin α = D / L1 Then, from the balance of the vertical force,

[0014]

## EQU2 ## M−M1−M2 = 0 holds. Further, from the moment balance,

[0015]

## EQU3 ## M · L3−M2 (L3 + L4) = 0 holds. From the above, the following equation holds.

[0016]

M2 = M−M1 M · L3− (M−M1) (L3 + L4) = 0 Therefore, the load M1 is obtained by the following equation (5).

[0017]

M1 = M−M (L2 / 2 · cos α + h · sin α) / (L2 · cos α) = M (1 / 2−h / L2 · tan α) From the above, the dump cylinder sensor 10 and the pressure Sensor 2
By adding the detected loads M1 and M2 of 0, the load weight M of the load can be obtained. The load weight AM calculated by the calculation unit 40 is displayed as a numerical value on the display 30, and the present load weight can be easily known from the displayed numerical value. A printer may be provided together with the display 30 to print out the loaded weight and date.

FIG. 5 shows another mounting example of the pressure sensor, in which a pressure sensor 72 is sealed in an oil flow pipe 71 of a front axle 70 in a screw-in manner. An oil nipple 73 is provided in the oil flow pipe 71, and V-boats 74A and 74B are suspended between a spring 75 for a shock absorber and a front axle 70. The spring 75 is attached to the chassis 3 as shown in FIG. Thus, even if the pressure sensor 72 is provided, the loaded weight of the load can be measured in the same manner as described above. In addition, the arrangement position of the pressure sensor is arbitrary, and may be determined from the convenience of retrofitting or manufacturing. In the above description, the calculation is performed when the angle α is detected and reaches a predetermined value, but the angle is arbitrary.

FIG. 7 shows an example in which the present invention is applied to a truck 80, in which four pressure sensors 82
A, 82B and 83A, 83B are installed. In this case, since the loading platform 81 does not move up and down, it is not necessary to detect the angle, and the load weight can be obtained by adding the detection loads of the pressure sensors 82A to 83B.

[0020]

According to the present invention, by simply operating the hand operation switch while sitting in the driver's seat, the calculation display means can accurately measure and calculate the load weight of the load in the driver's cab. Can be confirmed. Also, detection of dump cylinder sensor
The load and the dump angle detected by the dump angle measurement
Since the loaded weight is measured by calculation using a meter , accurate and simple measurement is possible, overloading is prevented, and safe driving can be performed physically and mentally. Further, there is an advantage that damage to the vehicle due to overloading can be prevented, and the management of the load amount is facilitated .

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a dump truck equipped with the present invention.

FIG. 2 is a block diagram showing an example of an electrical configuration of the present invention.

FIG. 3 is a structural diagram showing an example of an installation configuration of a pressure sensor.

FIG. 4 is a diagram for explaining calculation of a loaded weight.

FIG. 5 is a structural diagram showing another example of mounting the pressure sensor.

FIG. 6 is a diagram showing the entire structure of FIG. 5;

FIG. 7 is a view showing another embodiment of the present invention, wherein FIG. 7 (A) is a side view and FIG. 7 (B) is a plan view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dump car 2 Dump box 3 Chassis 4 Support shaft 5 Operating room 10 Dump cylinder sensor 20, 72 Pressure sensor 30 Display unit 40 Calculation unit 50 Data input unit 60 Angle detector

Claims (1)

(57) [Claims] 1. A and dump cylinder sensor provided between the dump truck chassis and dump box, wherein the dump box is
Switch means which operates when dumping up to an arbitrary height, dump angle measuring means for measuring a dump angle,
Luck be displayed by calculating the load weight of the dump cylinder cell <br/> down the difference between the output signal and dump angle cargo that is integrated into the dump box on the basis of when the switch means is actuated
Rolling; and a calculation display means installed in a room, the calculation display
The means may include a weight of the load M, the dump cylinder
The load detected by the sensor is M1, and the dump angle measuring means detects the load.
The dump angle α, the dump support and the dump cylinder
Distance L2, the center of gravity of the dump load and the bottom of the dump
When the distance is defined as h , the calculation is performed to calculate and display the load weight of the load as M = M1 / (1 / 2−h / L2 · tanα).
This is a vehicle weight measurement device.