JPH085446A - Loaded weight measuring instrument - Google Patents

Abstract

PURPOSE:To provide a loaded weight measuring instrument which has been improve so that precise loaded weight can be measured. CONSTITUTION:A loaded weight measuring instrument for measuring a loaded weight based on a signal output from a sensor installed on a vehicle is provided with an overloaded weight recording means 1 for judging the overload of a vehicle and recording the overloaded weight an overload discrimination means 2 for discriminating whether the loaded weight scalculate means of a sensor output signal is subjected to overloading or not by comparing this loaded with the overload weight recorded in the overloaded weight recording means 1, and a display means 3 for displaying any overloading when presence of overloading is discriminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loaded weight measuring device for measuring the weight loaded on the bed of a vehicle, particularly a freight carrier, to prevent overloading.

[0002]

2. Description of the Related Art A conventional load weight measuring device detects a load applied to front and rear wheels of a vehicle by a sensor, calculates a weight from a signal output from the sensor and displays the weight on a display unit. When it became, it was trying to give an alarm.

[0003]

As described above, the conventional load weight measuring device calculates and displays the weight based on the output signal from the sensor mounted on the vehicle and warns when the load is overloaded. I was trying to emit.

However, the loadable weight of a vehicle varies depending on the vehicle type, and the weight determined to be overloaded varies depending on the vehicle administrator. For example, there are various cases such as 10% increase and 50% increase. The weight value for determining overload is set for each weight measuring device, which lacks versatility.

An object of the present invention is to provide a loaded weight measuring device which is versatile.

[0006]

Means adopted by the present invention to solve the above problems will be described with reference to FIG.
FIG. 1 is a basic configuration diagram of the present invention. In a loaded weight measuring device for measuring a loaded weight based on a signal output from a sensor mounted on a vehicle, an overloaded weight recording unit 1 for recording an overloaded weight for determining overloading of the vehicle, and the sensor An overload judging means 2 for judging whether the overloaded weight calculated from the output signal is overloaded compared with the overloaded weight recorded in the overloaded weight recording means 1;
When the overload determination unit 2 determines that the stack is overloaded, the display unit 3 displays that the stack is overloaded.

Further, a plurality of overloaded weights to be recorded in the overloaded weight recording means 1 which are judged to be overloaded are recorded, and the determination by the overload determination means 2 is recorded in the overloaded weight recording means 1. Make a determination corresponding to a plurality of overloaded weights. Further, the overloaded weight recording means 1 records the overloaded weight for each sensor, which is determined to be overloaded, and the determination by the overloaded determination means 2 for each sensor recorded in the overloaded weight recording means 1. The overloaded weight and the loaded amount for each sensor calculated from the output of the sensor are compared to determine whether or not the overloaded.

Further, there is provided a data recording means 4 for recording the judgment result of the overload judging means 2. Further, the data recording means 4 records the loaded weight in addition to the determination result of whether or not it is overloaded.

Further, the overload determination means 2 determines whether or not the vehicle is overloaded when the vehicle is stopped.

[0010]

The overloaded weight recording means 1 records the overloaded weight for each sensor and the overloaded weight for determining overload with respect to the total loaded weight. The overload determination means 2 compares the overloaded weight and the overloaded weight for each sensor calculated from the output signal of the sensor with the overloaded weight recorded in the overloaded weight recording means 1 and determines whether or not overloaded. To judge.

When the overload judging means 2 judges that the overload is present, the display means B displays that the overload is present. Also,
A plurality of overloaded weights for determining overloading are recorded in the overloaded weight recording means 1 in order to determine how much overloaded. The overload determination means 2 is the overload weight recording means 1
It is determined that the load is overloaded in accordance with the plurality of overloaded weights recorded in.

Further, the overloaded weight recording means 1 records the overloaded weight determined to be overloaded for each sensor, and the overloaded determination means 2 is calculated from the recorded overloaded weight of the sensor and the output of the sensor. It is determined whether or not it is overloaded by comparing it with the loaded weight. Further, the overload judging means 2 records the judgment result in the recording means 4.

Further, the recording by the recording means 4 is also recorded together with the judgment result by the overload judging means 2 and the loaded weight. Also,
The overload determination means 2 determines whether or not the vehicle is overloaded when the vehicle is stopped.

As described above, the overloaded weight determined to be overloaded is recorded, and the calculated weight value is compared with the recorded overloaded weight to determine whether or not overloaded. Thus, the versatility can be enhanced by inputting and recording the value corresponding to the vehicle using the overloaded weight to be recorded.

Further, since a plurality of overloaded weights determined to be overloaded are recorded and determined, it is possible to easily know how much overloaded. Further, since it is determined whether or not the loaded weight calculated from the output of each sensor is overloaded, it is possible to easily know when the luggage is unbalancedly loaded on the vehicle.

Further, since the determination result of whether or not the vehicle is overloaded is recorded, it is possible to easily know the operation state of the vehicle by reading the recorded data. Further, since the determination result as to whether the vehicle is overloaded and the weight value are also recorded, it is possible to know a more detailed vehicle operation state.

Further, since it is determined whether the vehicle is overloaded or not when the vehicle is stopped, it is possible to make an accurate determination.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 2 is a configuration diagram of an embodiment of the present invention, FIG. 3 is a specific example of a sensor and a V / F converter of the embodiment, and FIGS. 4 and 5 are operation flowcharts of the embodiment.

In FIG. 2, 11 is a sensor, 12 is a V / F converter that outputs a pulse having a frequency proportional to the voltage output from the sensor 11, 13 is a weight conversion coefficient recording unit, and 1 is a weight conversion coefficient recording unit.
4 is an overload weight recording unit, 15 is a weight calculation unit, 16 is an overload determination unit, 17 is an alarm / display unit, 18 is a stopped state determination unit, 19 is a control unit for performing other control, 20 is an input unit, Reference numeral 21 is a data recording unit, 22 to 24 are interfaces (I / O), and 25 is a processor (CPU) for processing.
Is.

As shown in FIG. 3, the sensor 11 includes a magnetostrictive element 11a and a transformer 11 having the magnetostrictive element 11a as a magnetic path.
b. In addition, the V / F converter 12 includes an oscillator 12
a, resistor 12b, wave detector 12c and V / F conversion circuit 1
It is composed of 2d. When a load is applied to the magnetostrictive element 11a, distortion occurs and the magnetic permeability changes. When the magnetic permeability changes, the voltage induced in the secondary winding of the transformer 11b changes.

The voltage induced in the secondary winding is converted into direct current by the detector, and the V / F conversion circuit 12d outputs a pulse having a frequency proportional to the direct current voltage. The resistor 12b is a resistor having a high resistance value, and keeps the current flowing through the primary winding of the transformer 11a constant even if the output of the oscillator 12a slightly fluctuates.

Further, the detector 12c is the transformer 2 of the transformer 11b.
Multiply detection of the output signal of the next winding and the signal generated in the resistor 12b is performed to reduce the mixed noise component. The sensors 11-1 to 11-n are installed on, for example, all brackets for fixing the chassis and the springs, through which the weight of the vehicle is transmitted to the front wheels and the rear wheels.

When a load is applied to the sensor 11, as shown in FIG. 6, a pulse having a frequency corresponding to the applied weight is V /
It is output from the F conversion unit 12. Depending on the characteristics of the sensor 11 and the V / F conversion unit 12, there are some in which the relationship between the weight and the frequency changes linearly as shown in FIG. 6 (A), and also as shown in FIG. 6 (B) in a non-linear manner. Some change to.

The weight conversion coefficient recording unit 13 shows the conversion coefficient K _A for the sensor having the characteristic shown in FIG. 6A, and the conversion point of the characteristic for the sensor having the characteristic shown in FIG. 6B. The conversion coefficient up to frequency H _T is K _B1 , and above H _T K
Record _B2 in advance. Further, in order to display the weight loaded on the vehicle, it is necessary to remove the weight of the vehicle body, and after the sensor 11 is installed on the vehicle, the V / F conversion unit in a state where no luggage is loaded is displayed. The frequency H ₀ output from 12 is also measured and recorded in the weight conversion coefficient recording unit 13.

The overloaded weight recording unit 14 includes the sensors 11-
The weight value determined to be overloaded corresponding to 1 to n and the weight value determined to be overloaded with respect to the total weight loaded in the vehicle are recorded in advance. It should be noted that the weight conversion coefficient recording unit 13 and the overloaded weight recording unit 14 are configured by a non-volatile memory so that the recorded data is not lost even when the power is turned off.

Next, the operation of the embodiment will be described with reference to FIG. In process S1, the control unit 19 controls the input unit 20 to input the weight conversion coefficient recording unit 13 and the overloaded weight recording unit 14.
Judge whether or not there is a mode input to set data to
If the determination is YES, the process moves to step S2 and the setting process described later with reference to FIG. 4 is performed.

In step S3, the control unit 19 controls the I / O 23.
Measure the frequency of the input pulse. That is, H _i = N _i · / T ₀ (1) where H _i is the frequency of the i-th sensor T ₀ is a fixed time (seconds) N _i is the number of pulses of the i-th sensor output in T ₀ seconds The frequency H is calculated by performing the following calculation.

In step S4, the vehicle stop state determination unit 18 receives a pulse from a traveling sensor installed in the vehicle via the I / O 22 during the fixed time measurement by a constant time timer (not shown), as shown in FIG. Whether or not is determined, and if the determination is YES, the process proceeds to step S5, waits for T _W seconds, and proceeds to process S1.

That is, in step S4, it is determined whether the vehicle is running or is in a stopped state. Process S
In 6, the weight calculation unit 15 determines whether or not the frequency measured in the process S3 is within the specified range. If the determination is NO, the process moves to the process S7 and an error is displayed on the alarm / display unit 17.

That is, in step S6, an error is displayed and removed when a measurement value that cannot be obtained under normal conditions is measured due to the inclusion of noise or the like. In process S7, the weight calculation unit 15 reads the conversion coefficient K and the offset value H ₀ from the weight conversion coefficient recording unit 13 to calculate the weight.

That is, W _i = K _i (H−H ₀ ) ... (2) where K _i is the weight conversion coefficient of the i-th sensor H ₀ is the offset value of the i-th sensor H is the i-th sensor The frequency is calculated, and the loaded weight W is calculated by adding W = W ₁ + W ₂ + ... + W _n (3).

For a sensor having a non-linear characteristic as shown in FIG. 6B, when H <H _T (conversion point frequency), W _i = K _1i (H−H ₀ ) (4) ) for H ≧ H _T to calculate the _{W i = K 1i (H T} -H 0) + K 2i (H-H T) ... (5) formed by performing an operation weight W _i.

In process S9, the control unit 19 displays the loaded weight W calculated in process S8 on the alarm / display unit 17, outputs it via the I / O 24, and records it in the data recording unit 21. The weight added to each sensor calculated by the equation (2) is also output via the I / O 24 and recorded in the data recording unit 21.

In process S10, the overload determination unit 16 determines whether or not the weight calculated in process S8 is the overloaded weight by referring to the data recorded in the overloaded weight recording unit 14, When the determination is NO, the process moves to S1. It should be noted that whether or not the vehicle is overloaded is determined by the weight W of each sensor calculated from the output of each sensor in addition to the loaded weight W shown by the equation (3).
_{This is} also performed for _{1 to} W _n .

By thus determining whether or not the weight of each sensor is overloaded, for example, even if the loaded weight W is not overloaded, the load loaded on the vehicle is unbalanced. If this happens, you can easily know this and it will be useful for safe operation of the vehicle.

In step S11, when it is determined that the overloading has occurred, the alarm / display unit 17 sounds the buzzer and displays the overloading. Further, when it is determined to be overloaded, in addition to the determined sensor or the loaded weight output value, a flag indicating overloaded is set and output.

By repeating the operation described above,
As shown in FIG. 7, if a traveling pulse is detected between times T ₂ and T ₃ , weight calculation is not performed by the process of waiting for T _W seconds in process S5, and weight W calculated at time T ₂ during this period. ₂ is displayed and output.

After T _W seconds, the weight W ₃ is calculated at time T ₆ and the result is displayed. When the traveling pulse is input during the waiting of T _W seconds in the process S5, it is reset and the waiting of T _W seconds is started from the time of inputting a new traveling pulse. When the vehicle stops, the travel sensor does not output a travel pulse, and the weight calculation is started. However, in excessive period the vehicle is in the stopped state from the traveling vehicle is in motion, can not be performed to calculate the exact load weight This movement, calculate and exact weight on standby T _W seconds motion is eliminated I am trying to display it.

The data recorded in the data recording unit 21 can be taken back to an office or the like after the operation of the vehicle is finished and the recorded time-series data can be read to know the operation state of the vehicle. Also, the recorded data is data when the vehicle is in a stopped state, and the result of accurate determination of the weight value and whether or not the vehicle is overloaded is recorded.

In the embodiment, the data is recorded by the data recording section 21, but the data may be recorded by the recording section such as a tachograph or other vehicle information collecting device. good. Next, the operation of the installation process will be described with reference to FIG.

In step S21, the control unit 19 controls the input unit 2
It is determined which setting mode is designated by 0, and if it is an offset, the process proceeds to step S22, if it is a conversion coefficient, the process proceeds to step S24, and if it is overloaded, the process proceeds to step S26. In process S22, the control unit 19 reads the frequency value measured in process S3, moves to process S23, and records the offset value H ₀ in the weight conversion coefficient recording unit 13.

When the input unit 20 sets the offset in the process S21, it is carried out while the vehicle is not loaded with luggage and is stopped. In process S24, the weight conversion coefficient K is input from the input unit 20, and the process proceeds to process S25 to be recorded in the weight conversion coefficient recording unit 13.

As described with reference to FIG. 6B, when the sensor has a non-linear characteristic, K ₁ and K ₂ and the conversion point frequency H _T are also input and recorded. In process S26,
The overloaded weights W _{1 to} W _m for each sensor and the overloaded weight W ₀ for the total loaded weight are input from the input unit 20, and the process S2 is performed.
Then, the process is moved to 7 and recorded in the overload recording unit 14.

A plurality of weights determined to be overloaded may be recorded, and it may be determined whether or not the weight value recorded in the above-described step S10 has exceeded the weight value. By thus making a plurality of overload determinations, it is possible to easily know how much overload has occurred.

[0045]

As described above, according to the present invention, the following effects can be obtained. The overloaded weight that is determined to be overloaded is recorded, and it is determined whether or not overloaded by comparing the calculated weight value with the recorded overloaded weight. The versatility can be enhanced by inputting and recording the value corresponding to the vehicle using the loaded weight.

Since a plurality of overloaded weights determined to be overloaded are recorded and determined, it is possible to easily know how much overloaded. Further, since it is determined whether or not the loaded weight calculated from the output of each sensor is overloaded, it is possible to easily know when the luggage is unbalancedly loaded on the vehicle.

Further, since the determination result as to whether or not the vehicle is overloaded is recorded, it is possible to easily know the operation state of the vehicle by reading the recorded data. Further, since the determination result as to whether the vehicle is overloaded and the weight value are also recorded, it is possible to know a more detailed vehicle operation state.

Further, since it is determined whether the vehicle is overloaded or not when the vehicle is stopped, it is possible to make an accurate determination.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram of the present invention.

FIG. 2 is a configuration diagram of an embodiment of the present invention.

FIG. 3 is a specific example of the sensor and V / F conversion unit of the same embodiment.

FIG. 4 is an operation flowchart of the embodiment.

FIG. 5 is an operation flowchart of the embodiment.

FIG. 6 is an explanatory diagram of frequency-weight conversion.

FIG. 7 is an explanatory diagram of calculated weight and weight display.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Overloaded weight recording means 2 Overloaded determination means 3 Display means 11 Sensor 12 V / F conversion section 13 Weight conversion coefficient recording section 14 Overloaded weight recording section 15 Weight calculation section 16 Overload determination section 17 Alarm / display section 18 Stop State determination unit 19 Control unit 20 Input unit 21 Data recording unit 22-24 Interface (I / O) 25 Processor (CPU)

Claims (6)

[Claims] 1. A loaded weight measuring device for measuring a loaded weight based on a signal output from a sensor mounted on a vehicle, comprising: an overloaded weight recording means for recording an overloaded weight for determining overloading of the vehicle. An overload determination unit that determines whether or not the loaded weight calculated from the output signal of the sensor is overloaded compared with the overloaded weight recorded in the overloaded weight recording unit; A loaded weight measuring device, comprising: a display unit that displays that overloading has occurred when the determination unit determines overloading. 2. A plurality of overloaded weights recorded in the overloaded weight recording means, which are determined to be overloaded, are recorded, and the determination made by the overload determination means is recorded in the overloaded weight recording means. The loaded weight measuring device according to claim 1, wherein the determination is made according to the overloaded weight. 3. The overloaded weight recording means records the overloaded weight for each sensor, which is determined to be overloaded, and the determination by the overloaded determination means is recorded for each sensor in the overloaded weight recording means. 3. The overloaded weight is compared with the loaded amount of each sensor calculated from the output of the sensor so as to determine whether or not the overloaded weight is present.
The load weight measuring device described. 4. The loaded weight measuring device according to claim 1, further comprising a data recording unit that records a determination result of the overload determination unit. 5. The data recording means records the loaded weight in addition to the determination result as to whether or not it is overloaded.
The load weight measuring device described. 6. The method according to claim 1, wherein the overload determination means determines whether the vehicle is overloaded when the vehicle is stopped. Load weight measuring device.