KR100606192B1 - Unit, apparatus and method for measuring vehicle weight - Google Patents

Abstract

In the present invention, in measuring the weight of a vehicle made of a vehicle body and a vehicle body, a leg that rotates within a predetermined angle range is provided for each axle in response to a variation in the distance between the vehicle body and the chassis due to the increase or decrease of the vehicle load. By using one reference small inclinometer which detects the inclination angle of the car and a small inclinometer which detects the inclination angle of the legs installed in each axle, it can be easily mounted on the vehicle to easily measure the weight of the vehicle anywhere regardless of the loading place. It is possible to ensure accuracy and durability independent of variables such as temperature, and, more preferably, by using an inclinometer having an appropriate oil viscosity, a more accurate measurement is not affected by fine vibrations or the like.

Vehicle weight, inclinometer, leg, four angles, leaf spring

Description

Weighing unit, apparatus and method {UNIT, APPARATUS AND METHOD FOR MEASURING VEHICLE WEIGHT}

1 is an exemplary view of a vehicle weighing unit according to an embodiment of the present invention;

2 is an exemplary view when the vehicle weight measuring unit according to an embodiment of the present invention has a bracket;

3 is an exemplary view showing a principle of measuring the weight of the vehicle according to the present invention,

4A to 4C are exemplary views of a vehicle portion to which a vehicle weight measuring unit according to an embodiment of the present invention is mounted;

5A and 5B are schematic diagrams illustrating when the two legs of the vehicle weighing unit according to one embodiment of the present invention are at their most wide open and at least close, and

6A-6D are experimental graphs for implementing additional algorithms.

The present invention relates to a vehicle weight measuring unit, apparatus and method for measuring the weight of a vehicle, and more particularly, to a vehicle weight measuring unit, apparatus and method using a compact inclinometer.

In modern society, a lot of logistics are moving, and as an example, freight vehicles such as trailers can be easily found on the road. Although these freight vehicles play an important role in logistics transportation, when the load is excessive, vehicles that exceed a certain reference weight are overloaded due to excessive damage to the roads and the risk of accidents. The situation is being cracked down as a vehicle.

Therefore, it is necessary to measure the weight of the vehicle before driving the vehicle so as not to exceed the reference weight. In general, the driver moves the vehicle to the plate weighing device installed on the ground, and puts the wheel of the vehicle to measure it. have. However, this method can be cumbersome, even if the accuracy is beyond the scope of the weighing device, and even if the measured value exceeds the reference weight, the load can be removed again. In the end, the reality is that most drivers are judged by their experience rather than by this method.

In order to solve such a problem, a conventionally proposed technique is to measure a load by attaching a strain gauge to a leaf spring constituting the suspension of a vehicle, but such a strain gauge must be zeroed at any time. This zero adjustment, which must be performed in a flat position without loading, is very cumbersome, and the strain gauge is not durable due to vibrations during driving of the vehicle, and also may be damaged by conditions such as moisture. In addition, since the amplifier to amplify the output signal must be provided, the cost is also burdened.

Other techniques include attaching a wire type displacement gauge to the vehicle to measure the load from the displacement variation, but if the wire freezes in winter, the winding operation is impossible and the displacement variation cannot be measured. Due to this, there is a possibility that the wire is broken, and foreign substances such as water and soil may enter the gauge through the entrance and damage of the wire.

The present invention has been made to solve such a problem, and in measuring the weight of a vehicle made of a vehicle body and a vehicle, within a predetermined angle range in accordance with the variation of the gap between the vehicle body and the chassis due to the increase or decrease of the load of the vehicle. By installing a rotating leg for each axle and using one reference small inclinometer that detects the inclination angle of the vehicle body and a small inclinometer that senses the inclination angle of the legs installed for each axle, the vehicle is easily mounted on the vehicle and stored at the loading place. It is possible to easily measure the weight of the vehicle anywhere, regardless of the temperature, to ensure accuracy and durability irrespective of variables such as temperature, and preferably, by using an inclinometer having an appropriate oil viscosity, thereby affecting fine vibrations and the like. The purpose of the present invention is to provide a vehicle weighing apparatus and method for more accurate measurement without receiving. The.

A vehicle weight measuring unit of the present invention which achieves the above object, the vehicle weight measuring unit for measuring the weight of the vehicle consisting of the vehicle body and the vehicle body, the first inclinometer for detecting the inclination angle of the vehicle body; And a square angle forming means that enables calculation of a deflection amount of the vehicle body in association with the first inclinometer, wherein the square angle forming means comprises: a first leg fixedly coupled to a lower portion of the vehicle body; A second leg having one end connected to the first leg to be rotatable within a predetermined angle range; A guider fixedly coupled to the chassis to guide the other end of the second leg so that the second leg rotates according to a change in the amount of deflection of the vehicle body due to the increase or decrease of the load of the vehicle; And a second inclinometer coupled to the second leg to sense an inclination angle of the second leg.

According to the above configuration, since the vehicle includes a second leg that rotates according to the variation in the amount of deflection of the vehicle body, and one reference inclinometer that senses the inclination angle of the vehicle body, and an inclinometer that senses the inclination angle of the second leg, Pressing the second leg while sagging down moves the other end of the second leg along the guider to calculate the amount of deflection of the vehicle body from the angle of the angle formed between the first leg and the second leg and the length of the second leg to reduce the weight of the vehicle. Makes it possible to calculate.

In the present invention, the reason why the inclinometer is also installed in the vehicle body is that if the configuration of detecting only the inclination angle of the second leg does not consider the inclination of the entire vehicle, the angle between the vehicle body and the second leg, and the amount of deflection and the resulting vehicle weight This is because it cannot be measured accurately.

In the present specification, the weight or vehicle weight of the vehicle is used to refer to any one of gross weight, celebration, wheel load, and the like in some cases, and the chassis refers to a chassis including an axle (wheel axle). Sometimes.

In addition, in the present invention, although only one reference inclinometer (first inclinometer) for detecting the inclination angle of the vehicle body is sufficient, the site angle forming means composed of the first leg, the second leg, and the second inclinometer is each axle of the vehicle. It may be desirable to have as many as the number of wheels so as to correspond to each of the right and left axle to be installed correspondingly for each axle.

In addition to the above configuration, the vehicle weight measuring unit of the present invention which achieves the above object uses a leaf spring constituting a suspension device coupled to the vehicle chassis as a guider, and the other end of the second leg is provided with a roller. It features.

According to the above configuration, without providing a separate guider, a leaf spring, which is a part of the suspension system, is used as the guider, and a roller is installed at the other end of the second leg, and the second leg of the vehicle falls down when loading the cargo. When pressed, the rollers roll along the leaf springs, thereby making it possible to utilize the leaf springs provided in most freight vehicles.

A vehicle weight measuring apparatus of the present invention which achieves the above object, the vehicle weight measuring unit of any one of the above configuration; A computing unit in communication with a vehicle weighing unit, the computing unit comprising: obtaining the angle between the inclination angle of the vehicle body sensed by the first inclinometer and the inclination angle of the second leg detected by the second inclinometer; A computing unit for calculating a deflection amount and calculating a weight of the vehicle from the deflection amount; And a display unit displaying the weight of the vehicle calculated by the computing unit.

According to the above configuration, the inclination angle of the vehicle body and the second leg detected from the vehicle weight measuring unit includes a respective inclinometer for detecting the inclination angle of the vehicle body and the inclination angle of the second leg, respectively, and a second leg that rotates according to the variation in the amount of deflection of the vehicle body. The angle of inclination of the vehicle is calculated from the angle of inclination of the vehicle, the amount of deflection of the vehicle body is calculated from the angle of inclination and the length of the second leg, and the weight of the vehicle is calculated from the amount of deflection.

A vehicle weight measuring method of the present invention which achieves the above object is a vehicle weight measuring method for measuring the weight of the vehicle consisting of the vehicle body and the vehicle body, the step of detecting the inclination angle of the vehicle body; Detecting an inclination angle of a leg rotating within a predetermined angle range according to a change in the amount of deflection of the vehicle body due to an increase or decrease of a load of the vehicle; Obtaining the angle between the inclination angle of the vehicle body and the inclination angle of the leg; Calculating the amount of deflection of the vehicle body from the length and angle of the leg; Calculating a weight of the vehicle from the amount of deflection; And displaying the weight of the vehicle.

According to the above configuration, the inclination angle of the vehicle body and the angle of inclination of the leg that rotates according to the variation in the amount of deflection of the vehicle body are detected, and the angle of the vehicle is calculated. do.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(Example)

First, referring to FIG. 1, which is an exemplary view of a vehicle weight measuring unit according to an embodiment of the present invention, the measuring unit 100 includes a first inclinometer 110, a first leg 121, a second leg 122, It consists of the 2nd inclinometer 123 and the guider 124, and the angle | corner forming means is comprised by the 1st leg 121, the 2nd leg 122, the 2nd inclinometer 123, and the guider 124. As shown in FIG.

The first inclinometer 110 may be coupled to the lower portion of the vehicle body 200 to detect the inclination angle of the vehicle body 200, may be coupled to the first leg 121 coupled to the lower portion of the vehicle body 200, Since it is a surface parallel to the lower surface of the vehicle body 200 and has a same inclination angle as the inclination angle of the vehicle body 200, it may be installed anywhere.

Although the first inclinometer 110 and the second inclinometer 123 can measure the angle of inclination, the type of the pendulum may preferably be adjusted in an oil-filled state. It is good to adopt the inclinometer of the system which measures a tilt angle by measuring with a potentiometer.

In such an inclinometer, since the response time can be adjusted by the viscosity of the oil, the weight of the vehicle is stabilized by adjusting the viscosity of the oil to an appropriate level so as not to be greatly affected by the minute or sudden vibration of the vehicle due to the unevenness of the road. This is because accurate measurement is possible, and since it is completely sealed with an outer case and filled with oil inside, there is no fear that the inclinometer may be damaged by foreign matter such as snow, rain, sand, and soil.

Furthermore, it is more preferable to ensure more waterproof, dustproof and damage prevention by sealing the entire case with a material such as silicone and urethane once again, leaving only the lead line of the inclinometer.

Now, referring to the angle forming means, the first leg 121 is to be coupled to the lower portion of the vehicle body 200 by a bolt or the like, but may use a bracket 129 (see FIG. 2). In addition, the bracket 129 may be installed at a position where the upper and lower parts of the vehicle body 200 move up and down with the increase or decrease of the load, but as shown in FIG. 4, the bracket 129 is installed at the rubber damper under the vehicle body 200. This is preferable because the rubber damper can limit the minimum distance between the vehicle body and the chassis, thereby preventing the vehicle weighing unit of the present invention from being damaged due to the compression caused by the sudden increase in load.

One end of the second leg 122 is rotatably coupled to the first leg 121 by a coil (winding) spring 125 or the like, and the other end is provided with a roller 128 so that the vehicle body 200 at the time of loading the cargo. ) Is designed to rotate the second leg 122 towards the first leg 121 as the roller 128 rolls along the guider 124 when the) sag down. In addition, when the torsion spring is used as the spring 125, the distance to the point where the first leg 121 and the second leg 122 are restrained can be accurately measured.

In addition, the second leg 122 has a predetermined angle with respect to the first leg 121 by providing the pin 127 in the first leg 121 and the slot 126 in the second leg 122. It is possible to rotate only within the range of, preferably, the leg so that the vertical distance from the roller 128 of the second leg 122 to the first leg 121 when the second leg 122 is as far as possible is approximately 100mm Stability is ensured by designing the maximum angle between (121, 122) at approximately 55 °, which is a value when the length of legs 121, 122 is approximately 120 mm, respectively, According to the design, the maximum angle may be designed, and the value of 100 mm may also be designed according to the type of vehicle, the number of years of use, etc. A schematic view of when the two legs 121, 122 are fully open and at least close is shown in FIGS. 5A and 5B, respectively.

The second inclinometer 123 is fixedly coupled to the second leg 122 to detect the inclination angle of the second leg 122. In consideration of the performance of the inclinometer having a detection range of -60 ° to 60 °, the most stable output The coupling portion of the second leg 122 and the coupling portion of the second inclinometer 123, etc. are designed and installed to use -27.5 ° to 27.5 °, which can produce the same. .

The guider 124 is a roller 128 as the second leg 122 rotates toward the first leg 121 when the body 200 is pushed down while pressing the second leg 122 while loading the cargo. Provides a flat surface that can be rolled smoothly. The guider 124 is preferably in the form of a bracket installed on a chassis (not shown), such as an axle, as shown in FIG. 2, and a leaf spring (not shown) which is installed as part of a suspension device in most of the freight vehicles. May be installed in a rubber damper provided in the chassis, as shown in FIG. 4, and in some cases, a flat surface of a portion of the leaf spring without providing the guider 124 separately. May be used as the guider 124.

In the illustrated embodiment, the roller 128 is configured to roll on and move on the guider 124, but, for example, a predetermined groove which can dig into the guider 124 and move smoothly in the groove instead of the roller 128. Any shape may be used as long as the second leg 122 is in contact with the guider 124 when the second leg 122 is pressed, such as a configuration including a member.

The vehicle weight measuring unit 100 of the present invention configured as described above is installed in the vehicle at a position between the arrows as shown, for example, in FIGS. 4A to 4C. 4B illustrates a case of installing in the middle wheel portion, and FIG. 4C illustrates a case of installing in the rear wheel portion.

In installing the vehicle weight measuring unit 100 of the present invention in a vehicle, it is preferable that the vehicle is installed in the unloaded state, and the distance between the legs 121 and 122 when the legs 121 and 122 are opened to each other as much as possible. 80% or more and 90% or less of the distance, and the guider 124 must ensure a sufficient length for the roller 128 to roll until the load increases so that the rubber damper of the car body and the rubber damper of the car body come into contact with each other. .

In the vehicle weight measuring unit 100 according to the present invention, even when the load is suddenly reduced and the gap between the vehicle body and the chassis is sharply increased, the roller 128 of the second leg 122 moves with the guider 124 and the cloud. Since the roller 128 and the guider 124 are only in contact with each other and are in contact, the structure such as breakage in the conventional wire system can be prevented structurally, and the sudden change in load and the zero or less Measurement of nonsense unnecessary data such as a load can be prevented in advance.

Hereinafter, with reference to FIG. 3 showing the principle of measuring the weight of the vehicle according to the present invention, a vehicle weight measuring method will be described.

First, when no load is loaded, the distance H between the first leg 121 and the second leg 122, that is, the roller 128 of the second leg 122 contacts the guider 124. The distance H between the point C and the point B where the line drawn perpendicular to the vehicle body 200 meets the vehicle body 200 or the first leg 121 is It is as wide as one.

When the cargo is loaded in such a state, the vehicle body 200 gradually descends according to the load, and when the second leg 122 is pressed, the roller 128 rolls on the guider 124 while the second leg 122 is pressed. Since the leg 122 rotates toward the first leg 121, the angle θ between the first leg 121 and the second leg 122, that is, the vehicle body sensed by the first inclinometer 110. The difference angle θ between the inclination angle of 200 and the inclination angle of the second leg 122 sensed by the second inclinometer 123 is reduced, and as a result, the spacing H is also reduced.

The gap H decreases as the amount of deflection of the vehicle body 200 according to the load of the cargo, which is determined by the trigonometric formula for the length of the second leg 122, that is, the length of the line segment AC and the angle θ. The vehicle weight can be calculated from the relationship between the deflection amount of the vehicle body 200 and the load.

Since the relationship between the deflection amount and the loading load of the vehicle body 200 is somewhat different depending on the type of the vehicle, the type of the suspension device, etc., each of the relational expressions obtained by, for example, a regression analysis method and the like are used experimentally. . This relationship may in turn be expressed as a function of the angle θ and, although not shown, stored in a storage unit of the computing unit connected to the lead lines of the two inclinometers 110 and 123 of the vehicle weighing unit 100. It is.

The vehicle weighing unit 100, the computing unit and the display unit constitute a vehicle weighing apparatus according to the present invention, which is manufactured as a device dedicated to the present invention, as long as the computing unit has a function of performing the above roles. A PDA or the like may be used. In addition, the mutual communication method between the vehicle weight measurement unit 100, the computing unit, and the display unit may be not only wired but also wireless.

In addition, data collected by a computing unit or a PDA may be transmitted to an administrator using a modem such as wireless Internet or CDMA. It is preferable to use a stable modem as the transmission method, but the transmission method can be changed in accordance with the spread of the wireless Internet.

As can be understood from the above, the computing unit receives signals related to the inclination angle of the vehicle body 200 and the inclination angle of the second leg 122 from the first inclinometer 110 and the second inclinometer 123, respectively. Convert to digital and obtain the angle θ from it, calculate the gap H and the deflection amount sequentially from the angle θ and the length of the second leg 122, and calculate the vehicle weight from the relationship between the deflection amount and the loading load. It calculates and displays via a display unit (not shown).

In the above example, the length of the second leg 122 is used, but the length of the first leg 121 may be used, and the voltage of the inclinometer, the angle from there, the amount of change therefrom, It is preferable to omit the relationship between the vehicle weight therefrom and to apply the non-linear relationship between the voltage and the vehicle weight immediately.

That is, the order of converting voltage to load is the same as above, but the error value according to each conversion accumulates so that the value may deviate significantly from the theoretical value, and also the deformation of the suspension device such as a leaf spring over time. Since the algorithm of the computing unit of the present invention does not guarantee perfect linearity due to the present invention, in order to solve this problem, a method of deriving an equation of a polynomial function through interpolation of circular data of a read relative voltage and a load is performed. It further includes.

The polynomial equations are run from 2nd to 4th order according to the order using a loop and select the equation with the smallest error range (R). In addition, since equations of 5th or higher order not only have a long calculation, but also a large margin of error (R), the case of 5th or higher order is not considered.

Through the calculated equation, the relative voltage can be converted into the load in the error range of 0.1% or less. FIGS. 6A to 6D are processes for deriving the equations through graphs through actual experiments. 6B shows a second order polynomial, FIG. 6C shows a third order polynomial, and FIG. 6D shows a fourth order polynomial.

Although one embodiment of the present invention has been described above, various modifications are possible within the spirit and scope of the claims. For example, the vehicle weight measuring unit of the present invention may be modified into its corresponding configuration so as to be installed upside down.

According to the present invention, in measuring the weight of the vehicle body and the vehicle body, the inclination angle of the leg and the body and the inclination angle of the leg rotates within a predetermined angle range in accordance with the variation of the deflection amount of the vehicle due to the increase or decrease of the loading load of the vehicle, respectively By using each small inclinometer to detect, you can easily mount the vehicle to measure the weight of the vehicle anywhere, regardless of the place of loading, ensuring accuracy and durability regardless of variables such as temperature, Preferably, by using an inclinometer with an appropriate oil viscosity, more accurate measurement is possible without being affected by fine vibrations or the like.

Claims (4)

A vehicle weight measuring unit for measuring the weight of a vehicle consisting of a body and a vehicle, A first inclinometer for detecting an inclination angle of the vehicle body; And And a square angle forming means for enabling the calculation of the amount of deflection of the vehicle body in association with the first inclinometer. The angle forming means, A first leg fixedly coupled to a lower portion of the vehicle body; A second leg having one end connected to the first leg to be rotatable within a predetermined angle range; A guider fixedly coupled to the chassis to guide the other end of the second leg so that the second leg rotates according to the change in the amount of deflection of the vehicle body due to the increase or decrease of the load of the vehicle; And And a second inclinometer coupled to the second leg to sense an inclination angle of the second leg. The vehicle weight measuring unit according to claim 1, wherein a leaf spring constituting a suspension device coupled to the undercarriage of the vehicle is used as the guider, and the other end of the second leg is provided with a roller. The vehicle weight measuring unit according to claim 1 or 2; A computing unit in communication with the vehicle weight measuring unit, the computing angle obtained between the inclination angle of the vehicle body detected by the first inclinometer and the inclination angle of the second leg detected by the second inclinometer, The computing unit calculating the deflection amount of the vehicle body from a length and the angle and calculating the weight of the vehicle from the deflection amount; And And a display unit for displaying the weight of the vehicle calculated by the computing unit. A vehicle weight measuring method for measuring the weight of a vehicle consisting of a body and a vehicle, Detecting an inclination angle of the vehicle body; Detecting an inclination angle of a leg rotating within a predetermined angle range according to a variation in the amount of deflection of the vehicle body due to a change in the load of the vehicle; Obtaining an angle between the inclination angle of the vehicle body and the inclination angle of the leg; Calculating the amount of deflection of the vehicle body from the length and angle of the leg; Calculating the weight of the vehicle from the deflection amount; And And displaying a weight of the vehicle.

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