KR101314193B1 - Method and apparatus for calibrating weigher of axle using arbitary waveform generation - Google Patents

Abstract

The present invention relates to a method for automatically calibrating a lifter and an apparatus thereof, and in particular, an arbitrary waveform that is installed on an access road of a highway and actively corrects an error due to a change in the physical environment and an electrical numerical difference of a lifter sensor that measures the weight of a truck. The present invention relates to a method for automatically calibrating a lifter using a generator technique and an apparatus thereof.
According to the present invention, in the automatic calibration apparatus for a weight lifter, a speed sensor 11 for measuring a speed of a measurement target vehicle and a weight sensor for converting and outputting a weight detected from a measurement target vehicle moving at a predetermined speed into a voltage value ( A sensor unit 10 including 12; A measurement waveform generation unit 20 for generating a measurement waveform indicative of a voltage change over time by processing the speed measured by the speed sensor 11 and the voltage value measured by the weight sensor 12; An A / D converter 30 for converting the signal generated by the measurement waveform generator 20 into a digital signal; The main memory unit 41 stores the reference data for calculating the output value of the weight sensor 12 for the weight according to the speed change, and includes information corresponding to the digital signal output from the A / D converter 30. A main processor 40 which reads and compares the main memory 41 and outputs a correction signal for the difference value; A scale adjusting unit 60 receiving a correction signal of the main processing unit 40 to perform a volume control function; A D / A converter 50 for converting the correction signal adjusted through the scale controller into an analog signal; A correction waveform generator 70 generating a correction waveform for the correction signal through the analog signal of the D / A converter 50; A correction value adding unit (80) for generating a compensation waveform by reflecting the correction waveform to the measurement waveform; And a display unit 90 converting the compensation waveform into a weight value and outputting the compensable waveform so as to be identified.

Description

Automatic Calibration Method for Scale Lifter Using Arbitrary Waveform Generator and Its Device {METHOD AND APPARATUS FOR CALIBRATING WEIGHER OF AXLE USING ARBITARY WAVEFORM GENERATION}

The present invention relates to a method for automatically calibrating a lifter and a device thereof, and in particular, an arbitrary waveform which is installed on an access road of a highway and actively corrects an error due to a physical environment change and an electrical numerical difference of a lifter sensor that measures the weight of a truck. The present invention relates to a method for automatically calibrating a lifter using a generator technique and an apparatus thereof.

Accumulator is a machine that weighs a pair of wheels on the floor. It is generally installed in the access road of the highway and used to determine the overload by measuring the weight of the truck. Such an accumulator measures the weight using an electrical sensor, and in the case of a vehicle having a certain weight, the precision of the sensor is required so that the weight can be measured at a constant weight even when the speed is variable.

However, errors occur due to physical causes such as temperature and humidity, and electrical variation due to secular variation of the sensor. Therefore, calibration and calibration operations of the accumulators are generally performed at a monthly interval for this purpose.

In the existing method, it is necessary to carry out weighing one truck and driver, and operator and traffic controller who controls traffic, and it is usually short to check and calibrate the crane installed in one toll gate. It takes 3 to 8 hours of work.

The reason why it takes a long time for calibration and calibration work is because it uses a real-time verification method that verifies the reference weight while varying the speed by 1km within the range of 1km to 30km. The average error value within 5% of the test is required.

In this test, every time the truck enters and repeats the test to verify the measured value. Therefore, considering the work time and quantity required for the total number of toll gates in Korea (240 places; based on the highway construction data), It is a reality that causes waste of manpower.

The present invention was created to solve the above problems, and an object of the present invention is to generate a reference waveform of basic data on the weight and speed of a vehicle using an arbitrary waveform generator method, and to measure the measured value according to the actual measurement. The present invention provides a method and apparatus for automatically calibrating a condenser using an arbitrary waveform generator which generates a measurement waveform, compares and judges the reference waveform and the measurement waveform, and compensates the values for the difference waveforms.

In order to achieve the above object, the automatic weighing apparatus for a weight lifter using the arbitrary waveform generator method of the present invention includes a speed sensor for measuring the speed of a vehicle to be measured, and a measuring target for moving at a predetermined speed. A sensor unit including a weight sensor configured to convert the weight detected from the vehicle into a voltage value and output the converted weight; A measurement waveform generation unit for processing the speed measured by the speed sensor and the voltage value measured by the weight sensor to generate a measurement waveform indicative of a voltage change over time; An A / D converter converting the signal generated by the measurement waveform generator into a digital signal; And a main memory unit for storing reference data for calculating an output value of a weight sensor for a weight according to a speed change, and reading and comparing information corresponding to a digital signal output from the A / D converter from the main memory unit to compare the difference. A main processor for outputting a correction signal for the; A scale adjusting unit which receives a correction signal of the main processing unit 40 and performs a volume control function; A D / A converter converting the correction signal adjusted by the scale controller into an analog signal; A correction waveform generator for generating a correction waveform for the correction signal through the analog signal of the D / A converter 50; A correction value adding unit which generates a compensation waveform by reflecting the correction waveform to the measurement waveform; And a display unit converting the compensation waveform into a weight value and outputting the discernible waveform.

In this case, the sensor unit further comprises a temperature sensor for measuring the temperature and the humidity sensor for measuring the humidity, the main processing unit further includes an auxiliary memory unit for storing the output value change data of the weight sensor to which the change in temperature and humidity is applied, It is preferable to read and compare temperature and humidity information from a temperature sensor and a humidity sensor and information corresponding to a digital signal output from the A / D converter through the main memory unit and the auxiliary memory unit.

The display unit may be configured to output an error value obtained by converting the correction waveform into a readable numerical value together with the measurement waveform, the correction waveform, and the compensation waveform.

In order to achieve the above object, the automatic calibration method of the accumulator using the arbitrary waveform generator method of the present invention is an automatic calibration method of the accumulator, which converts a speed sensor and a measurement weight for measuring the speed of the vehicle to be measured into voltage values. A first step of preparing a sensor unit including a weight sensor and storing reference data for calculating an output value of the weight sensor with respect to a weight measured according to a speed change; A second step of allowing a vehicle to be measured to pass through the sensor unit at a predetermined speed, converting the detected weight into a voltage value and outputting the voltage; Generating a measurement waveform indicating a voltage change with respect to time by using a speed of the vehicle to be measured and a voltage value output through the weight sensor; A fourth step of converting the measurement waveform into a digital signal; A fifth step of receiving the digital signal, reading corresponding data from the main memory unit, comparing the reference data, and outputting a correction signal for the difference value; Adjusting a scale of the correction signal; A seventh step of converting the scaled correction signal into an analog signal; An eighth step of generating a correction waveform through the scaled analog signal; A ninth step of generating a compensation waveform by reflecting the correction waveform to the measurement waveform; A tenth step of converting the compensation waveform into a weight value and outputting the discernible waveform; And a control unit.

In this case, the sensor unit further comprises a temperature sensor for measuring the temperature and the humidity sensor for measuring the humidity, wherein the first step is further to store the output value change data of the weight sensor to which the change in temperature and humidity is applied to the auxiliary memory unit The fifth step may further include reading information corresponding to temperature and humidity information from the temperature sensor and the humidity sensor through the auxiliary memory unit.

By applying the present invention to the existing crane system, it is possible to automatically correct the measured value of the crane without the calibration work through the measurement reference vehicle and manpower, thereby significantly reducing the time and effort required for the inspection and calibration of the crane. do.

In addition, even without an accumulator system, the auto-calibrator of the accumulator using the arbitrary waveform generator method of the present invention can be effectively used for constructing a reliable accumulator system by providing an ideal simulation of the accumulator through reference waveform information.

1 is a conceptual diagram illustrating the installation of an automatic crane calibration device using an arbitrary waveform generator according to the present invention;
2 is a block diagram showing the configuration of an automatic crane calibration device using an arbitrary waveform generator according to the present invention;
3 is a reference diagram illustrating the concept of a reference waveform and a measurement waveform of the present invention;
4 is a graph showing an error occurring during A / D conversion;
5 is a flowchart illustrating a method for automatically calibrating a condenser using an arbitrary waveform generator according to an exemplary embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of the automatic lift calibration device using a random waveform generator method of the present invention.

1 is a conceptual diagram illustrating the installation of an automatic crane calibration apparatus using a random waveform generator according to the present invention. FIG. 2 is a block diagram showing the configuration of an automatic crane calibration apparatus using an arbitrary waveform generator according to the present invention. FIG. Reference diagram showing the concept of waveforms and measurement waveforms.

The present invention is applied to a livestock lifter system to serve to correct the error due to environmental changes on its own, so that the sensor unit 10 including the speed sensor 11 and the weight sensor 12, which is a basic configuration constituting the livestock lifter system It is provided.

The accumulator is mainly installed in the toll gate of the highway and measures the weight of the vehicle entering the highway, and converts the weight detected by the weight sensor 12 into a voltage value and processes the weight. The weight measurement is mainly performed while the vehicle moves at a predetermined speed, and the speed of the vehicle to be measured affects the output value of the weight sensor 12. Therefore, the weight of the vehicle is calculated by measuring a voltage value for the speed together with the speed of the vehicle to be measured passing through the sensor unit 10.

 In this case, assuming that the vehicle to be measured and the loaded cargo are 10 tons, even if the speed of the vehicle to be measured changes, the value of 10 tons should be calculated in the same way in the condenser system. However, most of the accumulator system, which consists of electronic systems, periodically generates electrical fluctuations of each electronic device due to environmental factors such as temperature, humidity, aging change of mechanism, noise from outside, electromagnetic waves, magnetic characteristics, etc. Recalibration is required.

In particular, the basic characteristics of the analog device have a lot of influence on the performance of the condenser system, and the error characteristics of the electronic device in the analog circuit will be described in detail as follows.

1. Change due to environmental factors

The signal transmitted from the weight sensor has a change in error due to environmental factors, even if the analog signal of voltage or current is converted to digital value through A / D (Analog to Digital Converter) conversion. Most electronic devices are designed to have normal parameter values at 25 degrees, and the electrical transfer coefficient may vary according to the resistance change of the device according to the temperature change of 1 ° C. Therefore, the applied voltage and current also change accordingly. This is called the temperature drift characteristic of the device, and in the circuit of the analog part, the accuracy of the system is often influenced. In addition, it can be affected by humidity, ambient electromagnetic and electromagnetic induction, radio interference, and even cosmic waves from space.

2. Resolution

The resolution of the accumulator system refers to the analog value of the minimum input identifiable by the A / D converter.In the binary n-bit converter, the analog full-scale value divided by 2 ⁿ is equal to the analog value corresponding to 1 LSB. do. The resolution of an A / D converter supporting 16 bits is 1/2 ¹⁶ = 1/65536. Considering the precision of the system, the A / D part is used for the 16th class or higher D / A (Digital to Analog Converter) part.

3. Straightness

It means the maximum deviation of the transmission characteristics in a straight line connecting both ends of the conversion range (eg scale value from 0 to full scale value). Linearity is expressed as a percentage of full scale value or as a fraction of 1 LSB. In general, the condition of a good linear converter means a device that guarantees a specified value within 0.5 LSB. The system specified in this patent uses lossless A / D and D / A.

4. Relative precision

When the offset error and the gain error are adjusted to zero, the linearity of the input and output of the converter is related. The converter with good relative accuracy means that the linearity error is within 0.5 LSB. The accuracy of A / D used in the crane system should be within 0.5 LSB.

5. Quantization Error

The quantization error is related to the uncertainty of 0.5LSB, which is inevitable in the A / D converter. In general, the digital code indicates the middle of the 1LSB. In order to reduce the quantization error, it is a good idea to increase the resolution. Although guaranteed to be within 1LSB, converters with quantization errors from high-speed A / D converters to 2LSBs are also used. However, it is often lower than this due to digital noise rather than this. However, the accumulator system is designed to be within 1LSB by reinforcement of the filter circuit.

6. Differential nonlinearity error

It is defined as the difference between any bit size and the theoretical bit size at any point in the conversion range. Therefore, in the A / D converter that defines the differential nonlinearity of 0.5 LSB, the bit size is within 0.5LSB or 1LSB at any point of the conversion output.

7. Monotonic increase error

When the input is increased or decreased continuously over the entire conversion range, the output also increases or decreases accordingly. To satisfy this monotonic increase, it is necessary that the differential nonlinearity is less than 1LSB.

8. Offset error

Analog input is zero in A / D converter In D / A converter, even if digital input is zero, the percentage of the full scale value of the output when the output does not become zero due to the internal factors of the converter or the power supply voltage. Say). The offset error is an error that almost exists not only in A / D but also in analog device circuits. Therefore, a method of designing a power supply ground and a device having a small offset error is required to prevent an offset error. If this offset error occurs, it is necessary to perform analog correction or software correction by algorithm in firmware. The offset error of the accumulator system is guaranteed to be within 30uV.

9. Gain Error

In A / D converter, the error rate of input voltage for digital output to become full scale value. In general, the error from the gain amplifier and the scaling factor to amplify it cannot be avoided. Therefore, it is necessary to design with high precision devices, and the error of the accumulator system eliminates the gain error by hardware and firmware.

4 is a graph illustrating an error occurring during A / D conversion. As shown in FIG. 4, offset error, linearity error, and gain error are the biggest factors that influence performance of the A / D changer.

10. A / D conversion time

The A / D conversion time is the time required for all digital outputs to complete after the signal is selected and the conversion start signal is given. In case of successive comparison A / D converter, in order for A / D conversion to be processed in synchronization with the clock, it shows the process until the status output of End of Conversion (EOC) appears after the bit of LSB is displayed at the MSB after the start. .

Between A / D converters is the same as A / D access time, which is one of the most important factors to consider in system design. In general, the faster the speed of the A / D converter, the lower the accuracy. On the contrary, the slower the speed of the A / D converter, the higher the precision bit conversion is possible. This is because they have inverse proportional factors due to signal line selection effects such as digital noise increase with speed and ground noise inherent in the power supply. The method used in the condenser system minimizes the noise caused by digital circuits by using software filters using hardware circuits and algorithms.

In the present invention, using the waveform measurement unit 20 generates a waveform showing the voltage change over time by using the voltage value converted from the speed and the measured weight of the vehicle to be measured. In this case, the measurement waveform generation unit 20 generates a waveform using a random waveform generation technique, and since the velocity measured from the measurement target vehicle becomes a function of time, the voltage value of the weight sensor with respect to the velocity It means the voltage change value for the change. Since the waveform is generated from the vehicle under measurement, it is called a measurement waveform.

In this case, since the voltage value output from the weight sensor 12 includes an error value in addition to the voltage value converted from the actual weight value, the measurement waveform also includes the error value. By correcting the error value, the operation of correcting the output value (voltage value) of the weight sensor 12 by the error value is made in the present invention. That is, as shown in FIG. 3, the theoretical output value of the weight sensor 12 may be accurately calculated to generate a reference waveform, and the error value may be determined by comparing the measured waveform with the reference waveform.

At this time, the information on the reference waveform which is the reference data of the decompression machine system calibration is stored in the main memory section 41 in advance. The information on the reference waveform is calculated by accurate calculation of the voltage value output from the weight sensor in the initial state, that is, the weight sensor recognizing the weight value. It is a calculated output value, and the information on the reference waveform does not have an error value.

The process of accurately determining the error value of the measurement waveform is performed through the main processor 40 using a DSP (Digital Signal Processor) processor in consideration of real time signal processing. In this case, the main memory unit 41 is included in the main processing unit 40.

For the processing using the DSP processor, the measurement waveform, which is an analog waveform, is converted into a digital signal through the A / D converter 30.

Thereafter, the digital signal output through the A / D converter 30 is sent to the main processor 40, and the main processor 40 sends reference data information corresponding to the digital signal to the main memory 41. Read through to compare the digital signal and the reference data to calculate the difference value. The digital signal corresponds to the measurement waveform and the reference data corresponds to the reference waveform to compare and determine the error value, but all of these processes are performed through the digital circuit. The main processor 40 outputs a correction signal for an error value corresponding to a difference between the digital signal and the reference data.

The correction signal is adjusted to a volume of a suitable size through the scale control unit 60. The scale adjusting unit is formed by combining a plurality of resistors having a predetermined value, and performs a function of adjusting the magnitude of the correction signal output through the main processing unit 40 to be converted into an analog signal.

 The correction signal having the volume control through the scale control unit 60 is converted into an analog signal through the D / A converter, and a correction waveform for the error value is generated through the correction waveform generator 70.

 The correction waveform is added to the measurement waveform through the correction value adding unit 80 to generate a compensation waveform from which an error value is removed from the measurement waveform.

The compensation waveform is converted into a weight value and outputted to be distinguishable through the display unit 90, so that the correct weight of the vehicle having the error value corrected is calculated and displayed.

At this time, the change in temperature and humidity may also be a factor influencing the electric fluctuation value, it is preferable to reflect the change in temperature and humidity for more accurate correction of the error value.

To this end, the sensor unit 10 includes a temperature sensor 13 and a humidity sensor 14 for measuring the temperature and humidity of the current atmosphere of the place where the measurement target vehicle is located. In addition, since the change value for the change in temperature and humidity should also be applied to the reference data, the main processing unit 40 further includes an auxiliary memory unit 42 in which the output value change data of the weight sensor to which the change in temperature and humidity is applied is stored. do. The data of the auxiliary memory unit 42 is also data that is accurately calculated by calculation, and the digital signal transmitted from the actual weight sensor 12 and output through the A / D conversion unit is the main memory unit 41 and the auxiliary memory unit. Comparison is made with reference data read in (42), but the main processor 40 refers to the signals of the temperature sensor 13 and the humidity sensor 14 before reading the data of the auxiliary memory 42, and displays the current temperature and the like. Load the data with humidity applied.

In order for the sensor 10 to be calibrated to the error value substantially, the error value should be output as a numerical value. To this end, the display unit 90 may be configured to convert a compensation waveform together with the measurement waveform, the correction waveform, and the compensation waveform to output a numerical value for reading an error value. That is, the error value will be represented as a voltage value, and the correction value is reflected to the sensor unit (specifically, the weight sensor) to perform the calibration operation.

In order to calculate an output value in the DSP processor, a method having an integration period of two stages is used. In the one-step integration time, S1 = ON state is integrated and the input voltage is integrated by a predetermined time T1 time. At this time, the integrator output Vt1 is given by the following equation (1.1).

(1.1)

(1.1)

In the next step, after the time T1 has elapsed, the internal switch S1 = OFF is turned on, and a reference voltage Vref of reverse polarity to the input voltage Vin is applied to the input. The time T2 at which the integrator output becomes 0 V is calculated.

(1.2)

(1.2)

Calculating V _in from the formulas of the first and second integration times is as follows.

(1.3) 단, 적분상수 RC

(1.3) Integral constant RC

The input voltage Vin is determined by V _ref as the input signal of the sensor input at the time ratio T1 and T2. The data thus obtained is used as an offset value for defining a reference value in the weight sensor 12. This offset value is used when the physical scale value is 0, the maximum value, and the intermediate value in consideration of the error.

The K constant value obtained through the experiment and the interpolation value M obtained by the interpolation formula are calculated from the obtained reference value Vad, and Vk, which is the offset of the final correction value, is obtained.

(1.3)

(1.3)

only,

The correction value Vk thus obtained is output to D / A through conversion of the scale factor value. Equation (1.4) is an output data calculation expression.

(1.4)

(1.4)

At this time, Ra and Rb are scale adjustment values.

With reference to the accompanying drawings will be described in detail according to the embodiment of the automatic lift calibration method of the accumulator using the arbitrary waveform generator method of the present invention.

5 is a flowchart illustrating a method for automatically calibrating a condenser using an arbitrary waveform generator according to an exemplary embodiment of the present invention.

In the embodiment of the automatic lift calibration method using the arbitrary waveform generator according to the present invention, a speed sensor for measuring the speed of the vehicle under measurement and a weight sensor for converting the weight detected from the vehicle under measurement to a voltage value in a first step S110. Sensor unit comprising a is prepared. In this case, in general, the vehicle to be measured moves at a predetermined speed and passes through the sensor unit, so that the reference data calculated by calculating the output value of the weight sensor for the weight measured according to the speed change is prestored in the main memory unit. .

The reference data is the output value calculated by accurate calculation that is used as reference information of the weight lifter system calibration and does not include an error value according to the secular variation or the environment.

In the second step (S120), the measurement target vehicle passes through the sensor unit at a predetermined speed, and the weight measurement is performed through the weight sensor 12 together with the speed measurement through the speed sensor 11, and through the weight sensor 12. The detected weight is converted into a voltage value and output.

In a third step (S130), a measurement waveform showing a voltage change with respect to time is generated by using the speed of the vehicle to be measured and the voltage value output through the weight sensor.

The measurement waveform is generated using an arbitrary waveform generation technique through a voltage value converted from the speed and the measured weight of the vehicle to be measured. In this case, since the voltage value output from the vehicle under measurement includes the error value in addition to the voltage value for the actual weight, the measurement waveform includes the error value.

In the fourth step S140, the measurement waveform, which is an analog waveform, is converted into a digital signal through an A / D converter.

Since the process of accurately determining the error value of the measurement waveform is made of a digital signal using a DSP (Digital Signal Processor) processor in consideration of real time signal processing, the measurement waveform, which is an analog waveform, is digitally processed for processing using the DSP processor. Convert to a signal.

In a fifth step S150, the digital signal and the reference data corresponding thereto are read from the main memory, and the digital signal and the reference data are compared and a difference value is calculated. That is, as shown in FIG. 4, the digital signal is data for a measurement waveform and the reference data is data for a reference waveform, and generates and outputs a correction signal for correcting an error value that is a difference value.

In the sixth step S160, the correction signal is adjusted to an appropriate scale. The scale adjustment is performed by combining a plurality of resistors having a predetermined value, and performs a function of adjusting the size of the correction signal to be suitable for converting into an analog signal.

In the seventh step S170, the correction signal with the scale adjusted is converted into an analog signal, and in the eighth step S180, the correction waveform is generated through the analog signal after the scale adjustment. This process is the reverse of the process of converting measurement waveforms into digital data.

In a ninth step S190, a compensation waveform is generated by adding the correction waveform to the measurement waveform. That is, by adding an inverse correction waveform corresponding to the error value from the measurement waveform including the error value, a compensation waveform from which the error value is removed is generated.

In the tenth step S200, the compensation waveform is converted into a weight value to be output by the user so as to be identified, and the weight of the vehicle in which the error value is corrected is output.

At this time, the change in the temperature and humidity of the atmosphere may also be a factor influencing the electric fluctuation value, it is preferable to reflect the change in temperature and humidity for more accurate correction of the error value.

To this end, the sensor unit 10 includes a temperature sensor 13 and a humidity sensor 14 for measuring the temperature and humidity of the current atmosphere of the place where the measurement target vehicle is located. In addition, since the change value for the change of temperature and humidity should also be applied to the reference data, in the first step, the auxiliary memory unit 42 stores data of the variation of the output value of the weight sensor to which the change of temperature and humidity is applied to the main processor 40. ) Is further provided. The data of the auxiliary memory section 42 is also data calculated accurately by calculation.

At this time, in the fifth step, the digital signal output through the A / D converter is compared with reference data read from the main memory 41 and the auxiliary memory 42, and the temperature sensor 13 and humidity The signal of the sensor 14 is referred to to retrieve data to which the current temperature and humidity are applied.

In order to substantially calibrate the sensor unit 10 with respect to the calculated error value, the error value should be output as a numerical value. To this end, it may be configured to convert the compensation waveform together with the measurement waveform, the correction waveform, and the compensation waveform to output a numerical value that can read the error value. That is, the error value will be represented as a voltage value, and the correction value is reflected to the sensor unit (specifically, the weight sensor) to perform the calibration operation.

It is to be understood that the invention is not limited to the disclosed embodiment, but is capable of many modifications and variations within the scope of the appended claims. It is self-evident.

10: sensor unit 11: speed sensor
12: Weight sensor 13: Temperature sensor
14: humidity sensor 20: measurement waveform generation unit
30: A / D conversion unit 40: main processing unit
41: main memory section 42: auxiliary memory section
50: D / A converter 60: scale control unit
70: correction waveform generating unit 80: correction value adding unit
90: display unit

Claims (5)

In the crane automatic calibration device,
A sensor unit 10 including a speed sensor 11 for measuring a speed of the measurement target vehicle and a weight sensor 12 for converting and outputting a weight detected from the measurement target vehicle moving at a predetermined speed into a voltage value;
A measurement waveform generation unit 20 for generating a measurement waveform indicative of a voltage change over time by processing the speed measured by the speed sensor 11 and the voltage value measured by the weight sensor 12;
An A / D converter 30 for converting the signal generated by the measurement waveform generator 20 into a digital signal;
The main memory unit 41 stores the reference data for calculating the output value of the weight sensor 12 for the weight according to the speed change, and includes information corresponding to the digital signal output from the A / D converter 30. A main processor 40 which reads and compares the main memory 41 and outputs a correction signal for the difference value;
A scale adjusting unit 60 receiving a correction signal of the main processing unit 40 to perform a volume control function;
A D / A converter 50 for converting the correction signal adjusted through the scale controller into an analog signal;
A correction waveform generator 70 generating a correction waveform for the correction signal through the analog signal of the D / A converter 50;
A correction value adding unit (80) for generating a compensation waveform by reflecting the correction waveform to the measurement waveform;
And a display unit (90) for converting the compensation waveform into a weight value and outputting the discernible waveform to be distinguishable.
The method of claim 1,
The sensor unit 10 further includes a temperature sensor 13 measuring a temperature and a humidity sensor 14 measuring humidity.
The main processor 40 further includes an auxiliary memory unit 42 in which output value variation data of a weight sensor to which temperature and humidity changes are applied are stored.
Temperature and humidity information from the temperature sensor 13 and the humidity sensor 14 and information corresponding to the digital signal output from the A / D conversion unit 30 are stored in the main memory unit 41 and the auxiliary memory unit ( 42) Automatic calibration device for a weight lifter using an arbitrary waveform generator method, characterized in that for reading and comparing through.
In the first aspect,
The display unit 90, together with the measurement waveform, correction waveform, compensation waveform,
And an automatic calibration device using an arbitrary waveform generator, characterized in that for outputting an error value obtained by converting the correction waveform into a readable numerical value.
In the automatic calibration method of the crane,
Preparing a sensor unit 10 including a speed sensor 11 for measuring the speed of the vehicle to be measured and a weight sensor 12 for converting the measured weight into a voltage value, the weight sensor for the weight measured in accordance with the speed change A first step (S110) of storing the reference data, the output value of which is calculated at (12), in the main memory unit 41;
A second step (S120) of allowing a measurement target vehicle to pass through the sensor unit 10 at a predetermined speed and converting the detected weight into a voltage value;
A third step (S130) of generating a measurement waveform indicating a voltage change with respect to time by using the speed of the vehicle to be measured and the voltage value output through the weight sensor 12;
A fourth step (S140) of converting the measurement waveform into a digital signal;
A fifth step (S150) of receiving the digital signal, reading corresponding data from the main memory unit 41, comparing the corresponding reference data, and outputting a correction signal for the difference value;
A sixth step (S160) of adjusting the scale of the correction signal;
A seventh step S170 of converting the scaled correction signal into an analog signal;
An eighth step S180 of generating a correction waveform through the scaled analog signal;
A ninth step (S190) of generating a compensation waveform by reflecting the correction waveform to the measurement waveform;
A tenth step (S200) of converting the compensation waveform into a weight value and outputting the discernible waveform; Automatic crane calibration method using a random waveform generator, characterized in that comprises a.
5. The method of claim 4,
The sensor unit 10 further includes a temperature sensor 13 measuring a temperature and a humidity sensor 14 measuring humidity.
The first step S110 may further include storing, in the auxiliary memory unit 42, output value variation data of the weight sensor 12 to which the temperature and humidity changes are applied.
The fifth step S150 may further include reading information corresponding to temperature and humidity information from the temperature sensor 13 and the humidity sensor 14 through the auxiliary memory unit 42. Automatic Calibration Method of Accumulator Using Arbitrary Waveform Generator Technique.

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