KR100492287B1 - Appratus for measuring weight of vehicle and method for using the same - Google Patents

Abstract

The present invention measures the leaf spring deformation value of the suspension device that changes as the cargo is loaded, and displays the axial weight or the gross weight of the cargo measured in advance by a regression analysis based on this value to the user in real time when loading the cargo. The present invention relates to a vehicle weighing apparatus and a measuring method thereof, which can easily measure the weight of the vehicle according to the method.

The present invention is a deformation amount measuring means for obtaining the analog measurement data by measuring the degree of deformation of the leaf spring is arranged in the leaf spring of the suspension device is deformed according to the load amount of the cargo; Data calculation means for calculating the measured data as a weight value; And data display means for indicating the weight value calculated by the data calculation means. Wherein the data calculating means comprises: a signal converter for converting the analog measurement data measured by the strain measuring means into digital data; A data storage unit for storing the converted data and a first or second functional formula; And a data operation unit which calculates a weight value by substituting the converted data into the first or second order or higher functional formula. Characterized in that it comprises a.

Description

Vehicle weighing apparatus and weighing method of vehicle using same {APPRATUS FOR MEASURING WEIGHT OF VEHICLE AND METHOD FOR USING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weighing apparatus for a vehicle and a method of measuring the same, and in particular, measures a strain value of a leaf spring of a suspension system that changes as a cargo is loaded into a loading box, and performs regression analysis based on the values The vehicle's weight can be easily measured by displaying the Axis Weight or Gross Vehicle Weight (GVW) of the cargo measured in advance through the equations. Furthermore, the present invention relates to a vehicle weighing apparatus capable of accurate weighing without being greatly influenced by a cargo loading pattern, and a measuring method thereof.

Currently, in Korea, a driver moves a vehicle to a plate weighing device installed on a road to measure the weight of a vehicle, and puts the wheel of the vehicle on the road to measure the weight of the vehicle. As a result, the driver has no choice but to judge whether or not overload is determined by a priori judgment. Therefore, when driving a vehicle, there is enormous economic cost loss due to road damage and overload crackdown. There was a problem that could cause a safety accident.

Conventionally, the invention disclosed in U.S. Patent No. 4630227 to solve such a problem is to install a hydraulic measuring instrument in the hydraulic device (3) installed at the bottom of the loading box (1) of the dump truck as shown in FIG. The load was measured by the hydraulic pressure measured from.

However, in such a case, as shown in FIG. 2, the degree to which the weight is measured in the hydraulic measuring instrument is different according to the loading positions (A, B) of the cargo loaded in the loading box 1. It was difficult.

That is, the load of the loaded cargo is divided and transmitted to the hydraulic shaft (3) and the hinge shaft (5) of the loading box 1, for example, when the load is concentrated in the "A" portion of the hydraulic system ( 3) When the load is concentrated, the load is concentrated on the hinge shaft (5) of the stacking box (1) when the load is concentrated, the weight of the vehicle was measured differently according to the loading pattern of the cargo, In addition, there is a critical problem that the weight allocated to each axle of the vehicle that is a direct cause of the road damage, that is, the weight can not be measured.

In addition, it is not possible to apply the above technique to a general cargo vehicle or a trailer type vehicle without a hydraulic device for tilting a loading box such as the dump type vehicle.

Accordingly, the present invention is to overcome the problems of the prior art as described above, and a first object of the present invention is to provide a vehicle weighing apparatus that is not significantly affected by the loading pattern of cargo.

Moreover, a 2nd object of this invention is to provide the measuring method which can measure a weight correctly using the measured value measured by the said vehicle weight measuring apparatus.

Another object of the present invention is to provide a vehicle weighing apparatus and a measuring method which allow a driver or a loading operator to easily check the load of cargo regardless of the place of loading of the cargo.

The first configuration of the present invention for achieving the above object is arranged in the suspension device of the vehicle to measure the gross weight or axial weight of the vehicle at the time of loading the cargo in the weighing apparatus of the freight vehicle to display in real time to the user A deformation amount measuring means for measuring the deformation degree of the leaf spring is arranged in the leaf spring of the suspension device to be deformed according to the load of the cargo to obtain analog measurement data; Data calculation means for calculating the measured data as a weight value; And data display means for indicating the weight value calculated by the data calculation means. Wherein the data calculating means comprises: a signal converter for converting the analog measurement data measured by the strain measuring means into digital data; A data storage unit for storing the converted data and a first or second functional formula; And a data calculating unit which calculates a weight value by substituting the converted data into the first or second order or higher functional formula.

At this time, the deformation amount measuring means is a rotating shaft (winding shaft) for accommodating the wire and the wire fixed to a portion of the leaf spring by the elastic restoring force of the spring and the rotation amount measuring sensor of the vehicle connected to the rotating shaft and the It is made of a fixed frame fixed to the rotation amount measuring sensor and fixed to another part of the leaf spring, the spring for supplying elastic restoring force to the rotating shaft is installed in the rotating shaft or rotation amount measuring sensor It is done.

In another aspect of the deformation measuring means, a wire having one end fixed to a portion of the leaf spring, an arm fixed to the other end of the wire spring opposite to the wire spring, and connected to an end opposite to the wire fixing side of the arm, It consists of a rotating shaft for rotating the shaft, a storage guide for accommodating a portion of the wire, a fixed frame fixed to the rotation amount measuring sensor and the rotation amount measuring sensor of the vehicle connected to the rotating shaft and fixed to another part of the leaf spring, The spring for supplying the elastic restoring force to the rotating shaft is characterized in that the spring is installed in the rotating shaft or the rotation amount measuring sensor.

Here, the rotation amount measuring sensor is preferably a throttle position sensor.

In addition, the weighing method of the present invention for achieving the second object, by measuring the gross weight or the axial weight of the vehicle when loading the cargo by placing the deformation amount measuring means on the suspension of the vehicle in real time on the display device In the weighing method of the freight vehicle to display, the step of examining the necessity of setting the regression equation, if necessary to set the regression equation, the step of setting the regression equation, and calculating and displaying the weight of the vehicle As the weighing method, the step of setting the regression equation may include setting the number of data necessary for setting the regression equation, loading the cargo, and acquiring the measured data from the actual weight of the cargo and the vehicle and the data measuring means. Repeating the process by the required number of data, regression analysis using the actual weight and the measured data Performing a first or second order regression equation; Comprising: The step of calculating and displaying the weight of the vehicle comprises the steps of acquiring the measured data from the data measuring means by loading the cargo, inputting the acquired data into the set regression equation and using the regression equation To calculate the weight and display the data on the data display means.

In addition, it is preferable that the regression analysis formula is set to be necessary when there is no regression analysis formula, and when it is determined that the reliability of the regression analysis formula is reduced due to the aging of the vehicle when the structure of the vehicle is changed.

At this time, in the step of measuring the deformation amount by using the deformation amount measuring means, the deformation amount is drawn out from the deformation amount measuring means attached to the frame of the vehicle and the front end of the way to measure the mileage variation of the wire attached to one side of the leaf spring It is preferable to make.

(Example)

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment of the present invention described above.

3 is a block diagram illustrating a weighing apparatus for a vehicle according to the present invention. The configuration of the weighing apparatus will be described with reference to the drawings.

First, the weighing apparatus of the vehicle according to the present invention includes a deformation amount measuring means 10 fixedly disposed on the leaf spring to measure the amount of deformation of the leaf spring, which is a suspension of the vehicle, which is deformed as the cargo is loaded. have.

In addition, the input / output terminals 12 and 13 for applying the power source 19 to the deformation amount measuring means 10 and outputting the measurement data measured from the deformation amount measuring means 10 to the data calculating means are arranged.

In this case, the data calculating means 15 includes a signal converter (A / D converter) 15a for converting the analog signal input from the input / output terminals 12, 13 into digital data, and the signal. Data storage units 15b and 15c for storing the first or second or more functional formulas and the converted measurement data, which are measured by the conversion unit 15a through regression analysis, and the stored data into the functional equations. A data calculation unit (CPU) 15d for substituting the vehicle and calculating the gross or axial weight of the vehicle is provided. In this case, a plurality of data storage units may be present. In this embodiment, the ROM 15b is used to permanently store the function expression, and the RAM 15c is used to temporarily store the measured data. In this case, the storage device for storing the regression analysis may not necessarily be a ROM. If it is necessary to change the regression analysis on a regular basis according to the vehicle, the data and the regression analysis may be changed using a general hard disk. It may be. Similarly, the measured data may be stored in a semi-permanent storage device such as a hard disk instead of the RAM, which is a temporary storage device.

In addition, the regression analysis may be performed by obtaining a desired first or second order function using a least square method that is commonly used. In other words, the least-squares method is a method of obtaining coefficients and constants that minimize the sum of squares of errors, which are differences between actual observations and regression estimates.

On the other hand, the first or second functional formula is to convert the measurement data output through the deformation amount measuring means when the cargo is loaded into the actual load or gross weight through the first or second functional formula.

Thereafter, the axial weight or the gross weight value of the converted vehicle is displayed in real time via a data display means 17 connected to an output end of the data calculating means, for example, a liquid crystal display, in which case the The data display means 17 may display the axial weight or the gross weight of the vehicle or simultaneously display the axial weight and the gross weight according to the user's selection.

In addition, when the data display means 17 is disposed in a suitable place in the vehicle, the driver can sit in the driver's seat and accurately grasp the axial weight or the gross weight of the vehicle in real time to control the load of the cargo so as not to be overloaded. It can fundamentally prevent the road damage caused by overload and the enormous economic cost of overload crackdown.

Hereinafter, the deformation measuring means 10 will be described in detail.

First, as shown in FIGS. 4 and 5, the leaf spring 20 as the suspension device is fixed by the U bolt 21 along with the axle 27 and both ends 23 are fixed on the wheel shaft 30. have. The axle is integrally connected with the chassis 25 so that the center portion of the chassis 25, the axle 27, and the spring 20 move integrally. If the additional load is applied, the order in which the load is transmitted is in the order of the chassis 25 → the axle 27 → the center of the leaf spring 20, and both ends 23 of the spring 20 are the wheel shaft 30. Since it is fixed above, it is fixed besides movement due to deformation of the wheel. Therefore, when the load is applied, the chassis (Chassis) moving integrally with the center of the leaf spring 20, that is, the center of the leaf spring is moved downward, and at one end of the strain measuring means installed on the chassis and the end of the spring The distance from the other end provided becomes close. At this time, the deformation amount measuring means is for measuring the difference between the deformation amount when the leaf spring 20 is only under the load of the vehicle and when the load is loaded under the load of the vehicle and the cargo at the same time as shown in FIG. .

In this case, the deformation amount may be measured as a distance difference between one side 23 of the spring positioned directly above the fixed point and the chassis 25 of the vehicle. The reason for this is that the chassis 25 of the vehicle moves integrally with the axle 27 located at the lower center of the spring, and the axle moves integrally with the central portion of the spring 20 so that the chassis 25 and the spring central portion are integrally formed. It is to be moved to, it is possible to measure the amount of variation in the height difference between the spring side and the central portion of the spring in a fixed position.

For this reason, the present invention devised a winding type measuring means fixed to the chassis of the vehicle (28). By the winding measuring means, the deformation distance can be measured by the traveling distance d of the wire 29 as shown in FIG. 5 and the traveling distance d can be measured according to the rotation amount of the winding shaft. That is, when a load is applied to the vehicle, the fixed part does not move, but the center portion of the spring moves downward. At this time, the chassis 25 integrally moving with the spring 20 also moves downward, so that the chassis 25 and the fixed part are moved. The distance between (23) becomes short, and this distance difference can be measured by the travel distance of a wire.

At this time, in order to measure the amount of rotation of the winding-type measuring means as described above, the rotation amount measuring sensor 31 is required. The rotation amount measuring sensor may have various forms, but it is preferable that the rotation amount measuring sensor having a rotating shaft in the center can measure that the angle of the rotating shaft varies depending on whether the wire is driven or not. As the rotation amount measuring sensor, the throttle position sensor (TPS) was used in the present invention. The rotation amount measuring sensor needs to be provided with a signal output terminal 13 to transmit the measured data to a subsequent signal converter (A / D converter).

Referring to FIG. 6, the shape of the deformation amount measuring means described above includes a wire 29 having one end fixed to a part of the leaf spring, and the opposite end of the wire is connected to the arm 32. The other end of the arm 32 is connected to a rotating shaft provided in the rotation amount measuring sensor 31 so that the arm can rotate about the rotating shaft. The wire can travel by the axial rotation of the arm as described above. In order to make the traveling distance of the wire and the rotation axis rotation angle proportional to each other, it is preferable that the housing is accommodated by the storage guide 34 so as to be accommodated while drawing an arc. However, such a storage method is not necessary to obtain linearity between the mileage and the rotation angle of the wire. The rotation amount measuring sensor 31 is fixed to the fixed frame 33, the arm 32 and the receiving guide 34 is also preferably included in the fixed frame.

The deformation amount measuring means of this embodiment is designed to increase the traveling amount of the wire by the arm as described above. However, the arm is not necessarily required, and the wire may be wound around the rotating shaft.

The deformation amount measuring means 28 of the present embodiment is configured such that the end of the wire 29 is fixed to one side of the leaf spring 20 and the main body is installed in the chassis 25 of the vehicle. At this time, the throttle position sensor has an elastic restoring force for winding the wire 29 to its original position, so that when the degree of deformation of the vehicle leaf spring increases, the chassis 25 and the end 23 of the leaf spring 20 to which the wire 29 is fixed are fixed. Since the distance of the wire is reduced, the travel distance of the wire 29 is shortened by the restoring force, and when the degree of deformation decreases, the distance between the chassis and the end of the wire becomes far, so that the travel distance of the wire becomes long again. The deformation amount of can be measured.

Therefore, it is possible to measure the vehicle weight easily due to the structure of the present invention as described above.

In addition, since the deformation amount measuring means as the present embodiment is a winding-type measuring means, even when the vehicle runs on a road with unevenness, there is no fear that the shock is transmitted to the wire and thus it may have high durability.

This embodiment has been described mainly in the case that both ends of the spring is installed on the two wheel shafts, such as the rear wheel of the vehicle, but need not necessarily. That is, in the case of the front wheel of FIG. 4, the central portion of the spring 20 ′ is fixed on one vehicle wheel shaft, and both ends of the spring 20 ′ are fixed to the chassis. In this case, since the deformation amount of the spring can be obtained by the distance difference between the chassis and the center part of the spring, the end of the wire of the deformation amount measuring means 28 'is preferably located at the center part of the spring 20'. In addition, the deformation amount measuring means as described above is not limited to the position of the wheel, it can be variously applied according to the number of wheels, the deformation portion of the spring and the like.

Hereinafter, with reference to FIGS. 7 and 3 attached to a method for measuring the weight of the vehicle using the vehicle weighing apparatus according to the present invention.

First, S2 to S9 of FIG. 7 is a step of obtaining an equation through a predetermined amount of experiments, and once a regression equation is set, it is not necessary to repeat it afterwards. In other words, the regression equation is set only when necessary, and the regression analysis value is not OK only when the regression equation is not present at all, or when the regression analysis needs to be performed again for reasons such as structural change of the vehicle and spring aging. It may be regarded as a state and implemented. When the regression analysis setting step as described above is completed, the regression analysis setting is changed to a set state (OK), and there is no need for regression analysis thereafter.

Looking at the procedure of the step of setting the regression analysis, first, the number of necessary data is determined (S2), and the experiments are repeated for the required number of data (S3 ~ S6), and then the regression analysis is performed (S7 ~ S9). . The experiment loads the cargo (S3), inputs the actual weight value using the basis weight value (S4), and acquires by measuring the data in the deformation amount measuring means 28 according to the loading of the cargo (S5), and the number of experiments is required. The process is repeated until the number of data is reached (S6). When the number of experiments meets the required number of data, a regression analysis is performed (S7) and stored in a data storage unit in the data calculating device (S8), and the regression analysis setting is regarded as a set state (OK) (S9). As described above, the step of setting the regression equation is set as one example for explanation, and the order between the unit steps may be changed without impairing the spirit of the present invention. For example, the step of acquiring the data and the step of inputting the actual weight does not deviate from the essence of the present invention even if the order is changed, and the step of performing the regression analysis and the setting of the regression equation set value are also the order. It can be changed.

The following steps (S10 ~ S12) is to determine the weight of the cargo when loading the actual cargo by using a pre-set regression analysis, the digital data value measured by the deformation amount measuring means when the cargo is loaded After converting to and obtaining (S10), the obtained data is input to a regression equation (S11), and the weight is calculated and displayed (S12).

On the other hand, in order to determine the reliability of the deformation amount measuring means according to the present embodiment, the following verification experiments were carried out.

First, in order to derive the regression equation, after loading the vehicle in the vehicle, the actual weight was measured with a load cell, and the amount of deformation of the leaf spring at that time was measured using the deformation measurement unit. After repeating the above 15 times, the first-order function was derived by regression analysis.

After entering the derived primary function into the ROM, the vehicle was again loaded with an arbitrary weight in the range of 10 to 20 tons and the weight of the vehicle calculated by the primary function was recorded. In order to compare the calculated weight of the vehicle, the load cell was placed on the floor, and the weight of the vehicle loaded with the actual cargo was measured. After this experiment was repeated 20 times, the measurement error was calculated by the following equation.

As a result of calculating the measurement error as described above, when the total weight of the vehicle was in the range of 20 to 30 tons (the combined weight of the cargo), the measurement error was 85 kg, and a good result was obtained.

Therefore, the effect of the vehicle weight measuring apparatus according to the present invention could be confirmed.

The above examples are only one embodiment of the present invention for embodying the present invention, and do not limit the present invention. Therefore, all things falling within the scope of the present invention shall fall within the scope of the present invention.

According to the present invention, it is possible to obtain simple and accurate loading information regardless of the loading pattern or loading location of the cargo, thereby greatly reducing the safety of the vehicle and fear of road damage.

1 is a schematic perspective view showing a weighing apparatus for a vehicle using hydraulic pressure according to the prior art;

2 is a schematic diagram showing a loading pattern of cargo loaded in a loading box;

3 is a schematic block diagram showing a weighing apparatus for a vehicle of the present invention;

Figure 4 is a schematic diagram showing the installation method of the weighing apparatus of the present invention,

5 is a conceptual diagram showing one way of the spring deformation when a load is applied to the vehicle,

Figure 6 is a schematic diagram of the deformation amount measuring means employed in the weighing apparatus of the present invention, and

7 is a flowchart illustrating a method of measuring a weight of a vehicle using a weighing apparatus.

(Explanation of the sign)

1: loading box, 3: hydraulic device,

5: hinge shaft,

10: strain measurement means, 12: input terminal,

13: output terminal, 15: data calculation means,

15a: A / D converter, 15b: ROM,

15c: RAM, 17: data display means,

19: power supply, 20,20 ': leaf spring,

21,21 ': U bolt, 23: end of leaf spring,

25,25 ': Chassis, 27: Axle,

28,28 ': strain measuring means, 29: wire,

30: wheel axle, 31: throttle position sensor,

32: arm, 33: fixed frame,

34: storing guide, 35: spring fixing part

Claims (7)

In the weighing device of the freight vehicle is disposed on the suspension of the vehicle to measure the gross weight or the axial weight of the vehicle when loading the cargo in real time to display to the user in real time, Deformation amount measuring means for obtaining the analog measurement data by measuring the degree of deformation of the leaf spring is arranged on the leaf spring of the suspension device and deformed according to the load amount of the cargo; Data calculation means for calculating the measured data as a weight value; And Data display means for indicating a weight value calculated by the data calculation means; Wherein, wherein the data calculation means A signal converter for converting the analog measurement data measured by the strain measuring means into digital data; A data storage unit for storing the converted data and a first or second functional formula; And And a data operation unit configured to calculate a weight value by substituting the converted data into the first or second functional equation. The strain measuring means A wire having one end fixed to a portion of the leaf spring; A rotating shaft (winding shaft) for accommodating the wire in a winding manner with an elastic restoring force of a spring; A rotation amount measurement sensor of the vehicle connected to the rotation shaft; And The rotation amount measuring sensor is fixed, and a portion of the wire is made of a fixed frame fixed to the chassis of the vehicle, The spring for supplying the elastic restoring force to the rotating shaft is installed in the rotating shaft or the amount of rotation measurement sensor, The rotation amount measuring sensor is a throttle position sensor (Throttle Position Sensor, TPS) characterized in that the vehicle weighing apparatus. In the weighing device of the freight vehicle is disposed on the suspension of the vehicle to measure the gross weight or the axial weight of the vehicle when loading the cargo in real time to display to the user in real time, Deformation amount measuring means for obtaining the analog measurement data by measuring the degree of deformation of the leaf spring is arranged on the leaf spring of the suspension device and deformed according to the load amount of the cargo; Data calculation means for calculating the measured data as a weight value; And Data display means for indicating a weight value calculated by the data calculation means; Wherein, wherein the data calculation means A signal converter for converting the analog measurement data measured by the strain measuring means into digital data; A data storage unit for storing the converted data and a first or second functional formula; And And a data operation unit configured to calculate a weight value by substituting the converted data into the first or second functional equation. The strain measuring means A wire having one end fixed to a portion of the leaf spring; An arm having one end fixed to the opposite end of the leaf spring of the wire; A rotating shaft connected to an end opposite the wire fixing side of the arm to axially rotate the arm; An arc-shaped accommodating guide accommodating a part of the wire; A rotation amount measurement sensor of the vehicle connected to the rotation shaft; And The rotation amount measuring sensor is fixed, a part of the wire, the arm, the receiving guide is made of, and consists of a fixed frame fixed to the chassis of the vehicle, The spring for supplying the elastic restoring force to the rotating shaft is installed in the rotating shaft or the amount of rotation measurement sensor, The rotation amount measuring sensor is a throttle position sensor (Throttle Position Sensor, TPS) characterized in that the vehicle weighing apparatus. delete delete delete delete delete