JPH07318405A - Loading weight measuring device - Google Patents

Abstract

PURPOSE:To know that the reset is performed in the normal condition or not by recording the carry out of the reset and the weight value at this stage per each time of resetting the recording of the offset value of the output of a sensor in the unloading condition. CONSTITUTION:In the case where the existence of the input of the offset setting mode from an input unit 221 to an over-loading weight recording unit 14 and an offset value recording unit 18 is judged by a control unit 20, or in the case where the existence of the input of the unloading information from a vehicle information collecting device 50 is judged by an offset value reset unit 19, the offset value resetting is performed. In this case, the reset unit 19 reads out the pulse frequency from I/O 23, 23, and this read pulse frequency is recorded in a recording unit 18 for the reset of the offset value. Carry-out of the reset and the weight applied to each sensor 111-11n, which is computed on the basis of the frequency recorded in the recording unit 18, are transferred to the vehicle information collecting device 50 for recording. On the basis of these time series data, the information that the reset is performed in the normal condition or not can be known.

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.

Further, in calculating the loaded weight, the sensor output value in an empty state in which the vehicle is not loaded with luggage is recorded in advance as an offset value, and the offset value is subtracted from the sensor output value. Weight is calculated.

[0004]

As described above, in the conventional load weight measuring device, when calculating the load weight, the sensor output value when the vehicle is empty is recorded as an offset value, and this offset value is stored. The value was subtracted from the sensor output value to calculate the loaded weight.

The offset value is likely to change due to vibration or the like due to the running of the vehicle. When it seems that the offset value has changed, the offset value is reset to record a new offset value. When the offset value is reset, the vehicle is supposed to be reset in an empty state, but if the luggage is erroneously loaded, an erroneous load weight is calculated.

The load weight measuring device is installed to prevent overloading of the vehicle, but the offset value is reset while the load is intentionally loaded to prevent illegal loading. May be performed.
It is an object of the present invention to provide a loaded weight measuring device capable of recording whether or not an offset value has been reset normally.

[0007]

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 that measures a loaded weight based on a signal output from a sensor attached to a vehicle, it corresponds to a data recording means 1 for recording time series data and an empty state for calculating the loaded weight of the vehicle. The offset value reset means 2 for resetting the recording of the offset value output from the sensor, and the writing means for writing the reset value in the data recording means 1 when the offset value resetting means 2 resets the offset value. 3 and.

Further, the writing means 2 writes in the data recording means 1 that the offset value has been reset, and at the same time, writes the weight value calculated from the sensor output value. The data recording means 1 is also used as a means for recording time-series data of a vehicle information recording device for collecting vehicle information.

Further, the reset of the offset value reset means 2 is carried out by the empty vehicle information of the vehicle information collecting device.

[0010]

The offset value resetting means 2 resets the record of the offset value output from the sensor corresponding to the empty state for calculating the loaded weight of the vehicle. When the offset value resetting means 2 resets the offset value, the writing means 3 records the resetting in the data recording means 1.

Further, the writing means 2 writes in the data recording means 1 that the offset value has been reset and at the same time writes the weight value calculated from the sensor output value. Further, the data recording means 1 is shared with the means for recording the time series data of the vehicle information of the vehicle information collecting device.

Further, the reset of the offset value of the offset value reset means 2 is performed based on the vacant vehicle information of the vehicle information collecting device. As described above, each time the offset value is reset, the fact that the offset value is reset is recorded, so it is possible to know from the recorded time-series data whether or not a normal reset was performed. .

Further, since the fact that the offset value has been reset is recorded and the weight value at that time is also recorded at the same time, it is possible to know from the recorded weight value whether it has been reset in a normal state, that is, in an empty vehicle state. be able to. Further, since the offset value is reset and the weight value record at that time is shared with the record of the time series data of the vehicle information collecting device, the device configuration is simplified and the data analysis is facilitated. I can do it.

Further, since the offset value resetting operation is performed based on the vacant vehicle information of the vehicle information collecting device, the offset value can be automatically reset.

[0015]

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 to 6 are operation flowcharts of the embodiment.

In FIG. 2, 11 is a sensor, 12 is a V / F converter which outputs a pulse having a frequency proportional to the voltage output from the sensor 11, 13 is a weight conversion coefficient recording unit, 1
4 is an overloaded weight recording unit, 15 is a weight calculation unit, 16 is an overload determination unit, 17 is an alarm / display unit, 18 is an offset value recording unit, 19 is an offset value reset unit, and 20 is a control for performing other control. 21 is an input unit, 22 to 24 are interfaces (I / O), 25 is a processor (CPU) for processing, and 50 is a vehicle information collection device.

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 to 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 11b 2
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. 10, a pulse having a frequency corresponding to the weight applied is V
Output from the / F conversion unit 12. Sensor 11 and V / F
Depending on the characteristics of the conversion unit 12, there are some in which the relationship between weight and frequency changes linearly as shown in FIG. 10 (A), and some in which they change non-linearly as shown in FIG. 10 (B). .

The weight conversion coefficient recording unit 13 is shown in FIG.
The conversion coefficient K _{A is given} to the sensor having the characteristic indicated by, and the conversion coefficient up to the frequency H _T , which is the characteristic conversion point, is equal to or higher than K _B1 , H _T , for the sensor shown in (B). Then, record K _B2 in advance. The overloaded weight recording unit 14 preliminarily sets the weight value determined to be overloaded corresponding to each of the sensors 11-1 to 11-n and the weight value determined to be overloaded with respect to the total weight loaded on the vehicle. Keep a record.

Further, in order to display the weight loaded on the vehicle in the offset value recording section 18, it is necessary to remove the weight of the vehicle body. After the sensor 11 is installed on the vehicle, the load is loaded. V / F conversion unit 1 in a state where it is not turned on
2. Record the frequency H ₀ output from 2.

The weight conversion coefficient recording unit 13, the overloaded weight recording unit 14, and the offset value recording unit 18 are composed of a non-volatile memory so that the recorded data will not be lost even when the power is turned off. . First, before describing the operation of the embodiment, the configuration and operation of the vehicle information collection device 50 will be described with reference to FIGS.

In FIG. 7, reference numeral 51 denotes a vehicle data calculating section for calculating vehicle data, 52 denotes a vehicle data recording section for recording the data calculated by the vehicle data calculating section, and 53 denotes a vehicle data recording section. An output information recording unit that records whether to output information, 54 is an output data creating unit that creates output data based on the information recorded in the output information recording unit, and 55 is when a signal is input to an external input channel. An external input process recording unit for recording the process of No. 5, 56 is an external input process starting unit for starting the process when a signal is input to the external input channel, and 59 is an input unit.

Further, 57 is a data recording card for recording vehicle information, 58 is a card reading / writing device (card R / W),
Reference numerals 60 to 62 are interfaces (I / O), and 63 is a processor (cpu) that performs processing. First, the data recording of the output information recording unit 53 and the external input processing recording unit 55 will be described.

The input of the recording data is performed from the input unit 59. The input unit 59, as shown in FIG.
9 "," real / empty "to enter whether the vehicle is an empty vehicle or an actual vehicle," high /-"to enter whether to drive on a highway or general road, and input that the data is written in the memory to composed of "f ₁ ~f _8" as in addition to function keys such as "write".

The output information recording section 53 and the external input processing recording section 55 are constituted by a non-volatile memory such as an EEPROM, for example, and are constituted by a two-dimensional memory as shown in FIG. In FIG. 12, row addresses 13 to 1C
The memories corresponding to the column addresses F9 to FD form the external input processing recording unit 55, and the other memories form the output information recording unit 53.

The row in FIG. 12 corresponds to the items to be collected as vehicle information, such as the vehicle code, the total traveling distance, the actual vehicle traveling distance on the general road, the actual vehicle traveling distance on the highway, and the empty vehicle traveling distance on the ordinary road. In addition, empty car highway mileage, actual vehicle and empty car general road travel time, actual vehicle and empty car highway travel time, general and highway maximum speed, engine rotation time, engine over rotation time, engine speed, general and highway speed Items such as overtime are associated with each address.

The columns correspond to the types of data output via the card R / W 58. For example, when leaving the car, the items "0" indicate "vehicle code", "total mileage", and "when leaving." The “time” is recorded, and the output items when the collected data is output, such as data of all items at the time of warehousing, are recorded.

For the item of the external input channel, when "1" is recorded, the integration of the number of signals input by the external input channel is input, and when "2" is recorded, it is input from the external input channel. Set the pulse on time to "3" again.
When is recorded, the signal input from the input channel is output as external event data using the signal as a trigger.

That is, as shown in FIG. 12, when a pulse is input to "external input CH3", "external event data 1" is set as "actual vehicle general mileage" and "external input CH1".
Data of “Pulse number input from external input CH2” and “Pulse ON time input from external input CH2”
Output to a recording card (not shown) via W21.

[One-touch event data A]
Indicates a data item to be output when the "A" key of the input unit 20 shown in FIG. 12 is pressed, when the key is pressed. That is, for example, when the loading process is started or ended, the "one-touch event data A" is pressed, and when the unloading process is started or ended, the "one-touch event data B" is pressed.

When the vehicle is in an empty state and the empty vehicle is pushed with the "actual / empty" key, empty vehicle information is output to the loaded weight measuring device through the I / O 60. Writing to the non-volatile memory shown in FIG. 12 is performed from the input unit 50. After pressing the "write" key shown in FIG.

The operation of the vehicle data calculation unit 51 is performed in a time division interrupt, and is started each time a pulse is input from the running sensor and the engine rotation detecting sensor via the I / O 61. If the input pulse is from the travel sensor,
Based on the input pulse, "accumulated mileage", "actual vehicle / empty vehicle / general / high speed mileage", "actual vehicle / empty vehicle / general / high speed traveling time", "general / high speed maximum speed" and "general / high speed""Overtime" etc. are calculated.

If the input pulse is from the engine rotation sensor, "engine rotation time", "engine over rotation time", "engine speed", etc. are calculated. The calculated result is recorded in the vehicle data recording unit 52. Next, the operation of the vehicle information collection device will be described with reference to FIG.

In step S51, the preparation for leaving the vehicle is completed, the operation is started when the data recording card 57 is inserted into the card R / W 58, and the output data creating section 54 causes the "exiting data" in the external input processing recording section 55. Read the item recorded in. That is, in the case of FIG. 12, the "vehicle code", the "total traveled distance", and the "event occurrence time" are read.

In step S52, the output data creation unit 54
Reads out the data corresponding to the item read out in the process S51 from the vehicle data recording unit 52 and a clock unit (not shown) and outputs the data through the card R / W 58.
Record at 7. In step S53, the output data creation unit 54
Determines whether or not it is the time designated in advance by comparing it with the time of the clock section, and if the determination result is NO, the process S56.
In the case of YES, the process proceeds to S54.

In step S54, the output data creation unit 54
12 reads out the output item recorded in the "constant time data" of FIG. 12, and in process S55, the data corresponding to the read item is read out from the vehicle data recording unit 52 to read the card R /
The data is recorded on the data recording card 57 via W58.

In step S56, the output data creation unit 54
Determines whether or not there is an event input from the input unit 59. If the determination is NO, the process proceeds to step S59, and if YES, the process proceeds to step S57. That is, as described with reference to FIG. 12, it is determined whether or not there is a key input such as “one-touch event A” during loading or “one-touch event B” during unloading.

In step S57, the output data creation unit 54
12 reads the output item corresponding to the input key in FIG. 12, moves to step S58, reads the data corresponding to the read item from the vehicle data recording unit 52, and reads the card R / W5.
The data is recorded on the data recording card 57 via No. 8.

In the process S59, the external input process activation unit 56
Determines whether or not a signal is input from the external input channel via the I / O 60 or 62. If NO, the process proceeds to step S61, and if YES, the process proceeds to step S60. Process S6
At 0, the external input process activation unit reads out the record of the external input process recording unit 55 corresponding to the external input channel to which the signal pulse is input, activates the output data creation unit 54, reads it from the vehicle data recording unit 52, and reads the card R. It records on the data recording card 57 via / W58.

That is, in the case of FIG. 12, as the external event data 1, the actual vehicle running distance, the count number of the external input channel 1, the pulse-on time of the external input channel 2 and the event occurrence time are output. Also, I / O
When data is transferred from the loaded weight display via 60, it is recorded on the data recording card 57 via the card R / W 58.

In process S61, the output data creation unit determines whether or not the received data is output. If NO, the process proceeds to process S53 to repeat processes S53 to S61, and if YES, the process proceeds to process S63. To determine whether or not the vehicle has entered,
When the work of the day is completed, the driver inputs 5
When the storage data output key 9 is pressed, a pulse is sent out, and it is determined whether or not this pulse is output.

In step S63, the output data creation unit 54
Is an output information recording unit 53 and an external input processing recording unit 55.
The record corresponding to the record is read from the vehicle data recording unit 52 by referring to the record recorded in the card R / W5.
The data is recorded on the data recording card 57 via 8 and the process is terminated.

The operation of the embodiment will be described below with reference to FIG. In process S1, the control unit 20 determines whether or not there is a mode input for setting data in the weight conversion coefficient recording unit 13, the overloaded weight recording unit 14, and the offset value recording unit 18 from the input unit 21, and the determination is made. If NO, process S2
If YES, the process proceeds to step S2a, and the setting process described later with reference to FIG. 5 is performed.

In process S2b, the offset value reset unit 19 determines whether or not empty vehicle information is input from the vehicle information collection device 50 via the I / O 24. If the determination is NO, the process proceeds to process S3 and YES. In the case of, the process proceeds to step S2a, and the offset value reset process described later with reference to FIG. 6 is performed.

In step S3, the control unit 20 controls the I / O 23.
Measure the frequency of the input pulse. That is, H _i = N _i · / T _o (1) where H _i is the frequency of the i-th sensor T _o is a fixed time (seconds) N _i is the number of pulses of the i-th sensor output in T _o seconds The frequency H is calculated by performing the following calculation.

In process S4, as shown in FIG. 11, the control unit 20 determines whether or not a pulse is input from the traveling sensor installed in the vehicle via the I / O 22 during the fixed time measurement by the constant time timer (not shown). Is judged, the judgment is YE
In the case of S, the process moves to the process S5, waits for T _W seconds, and moves to the 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, when noise or the like is mixed and a measurement value that cannot be obtained normally is measured, an error is displayed and removed. In step S7, the weight calculation unit 15 reads the conversion coefficient K from the weight conversion coefficient recording unit 13 and the offset value H _O from the offset value recording unit 18 to calculate the weight.

That is, W _i = K _i (H−H _O ) ... (2) where K _i is the weight conversion coefficient of the i-th sensor H _O 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. 10B, when H <H _T (conversion point frequency), W _i = K _1i (H−H _O ) (4) ) for H ≧ H _T to calculate the _{W i = K 1i (H T} -H O) + K 2i (H-H T) ... (5) formed by performing an operation weight W _i.

In process S9, the control unit 20 displays the loaded weight W calculated in process S8 on the alarm / display unit 17 and outputs it via the I / O 24. The weight added to each sensor calculated by the equation (2) is also output via the I / O 24.

The data output via the I / O 24 is
As described above, it is recorded in the data recording card 57 of the vehicle information collecting device 50 and used for managing the operation state of the vehicle. In the process S10, the overload determination unit 16 determines whether the weight calculated in the 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.

In step S11, when it is determined that the overloading is performed, 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. 11, time T₂And T ₃Running pulse between
Is detected, T in step S5_WWaiting for seconds
The weight is not calculated by reason, and the time T₂Calculate to
Weight released W₂Is 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, the vehicle is moving during the transient period when the vehicle is in the stopped state rather than running, and the accurate load weight cannot be calculated due to this movement, and the accurate weight is calculated by waiting for T _W seconds when there is no movement. I am trying to display it.

In the embodiment, the weight is not calculated when the traveling pulse is detected. However, the weight is calculated, or the weight is displayed by recording the weight before traveling. May be. Next, the operation of the installation process will be described with reference to FIG.

In process S21, the control unit 19 controls the input unit 2
It is determined which setting mode is designated by 0, the process proceeds to step S2c if it is an offset, to step S24 if it is a conversion coefficient, or to step S26 if it is overloaded. In the process S2c, the offset value reset unit 19 performs an offset value reset process described later with reference to FIG.

In process S24, the weight conversion coefficient K is input from the input unit 20, and the process moves to process S25 to be recorded in the weight conversion coefficient recording unit 13. As described with reference to FIG. 10B, 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 the process S26, the overloaded weights W _{1 to} W _m for each sensor and the overloaded weight W ₀ with respect to the total loaded weight are input from the input unit 20, and the process proceeds to the process S27 to be recorded in the overloaded recording unit 14. Next, the reset operation performed by the offset value reset unit 19 will be described with reference to FIG.

In process S22a, the offset value reset unit 19 reads the pulse frequencies H _{01 to} H _0n from the V / F converters 12-1 to 12-n input via the I / O 23, and the process proceeds to process S22b. The offset value is recorded in the offset value recording unit 18. That is, in the processes S22a and S22b,
Record H ₀ as described in equation (2) or (4) and (5).

In the process S22c, when the update of the record of the offset value is completed in the process S22b, the fact that the offset value is reset is transferred to the vehicle information collecting device 50 through the I / O 24 and recorded in the data recording card 57. In the process S22d, the offset value recording unit 18 is processed in the process S22b.
The weight added to each sensor is calculated by reading out H _{01 to} H _0n recorded in step S22e, and the calculated weight is I / O.
It is transferred to the vehicle information collecting device 50 via 24 and recorded.

As described above, when the offset value is reset, it is possible to know whether or not the reset is normally performed by recording the fact that the offset value has been reset and the weight at the time of the reset. In the embodiment described above, the fact that the vehicle has been reset and the weight of the reset value are recorded in the vehicle information collecting device. However, the recording of these information is recorded in this memory by connecting the memory to the I / O 24. It may be allowed to.

[0065]

As described above, according to the present invention, the following effects can be obtained. Every time the offset value is reset,
Since the fact that the offset value has been reset is recorded, it is possible to know from the recorded time series data whether or not a normal reset has been performed.

Further, since the fact that the offset value has been reset is recorded and the weight value at that time is also recorded at the same time, it is possible to know from the recorded weight value whether it has been reset in a normal state, that is, in an empty state. be able to. Further, since the offset value is reset and the weight value record at that time is shared with the record of the time series data of the vehicle information collecting device, the device configuration is simplified and the data analysis is facilitated. I can do it.

Further, since the offset value reset operation is performed based on the vacant vehicle information of the vehicle information collecting device, the offset value can be automatically reset.

[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 operation flowchart of the embodiment.

FIG. 7 is a configuration diagram of a vehicle information collecting device of the embodiment.

FIG. 8 is a specific example of an input unit of the vehicle information collection device.

FIG. 9 is an operation flowchart of the vehicle information collection device.

FIG. 10 is an explanatory diagram of frequency-weight conversion.

FIG. 11 is an explanatory diagram of calculated weight and weight display.

FIG. 12 is a specific example of output information and external input processing records of the vehicle information collection device.

[Explanation of symbols]

 1 data recording means 2 offset value resetting means 3 writing means 11 sensor 12 V / F conversion section 13 weight conversion coefficient recording section 14 overloaded weight recording section 15 weight calculation section 16 overloaded determination section 17 alarm / display section 18 offset value Recording unit 19 Offset value resetting unit 20 Control unit 21 Input unit 22 to 24 Interface (I / O) 25 Processor (CPU) 50 Vehicle information collecting device 57 Data recording card

Claims (4)

[Claims] 1. A load weight measuring device for measuring a load weight based on a signal output from a sensor mounted on a vehicle, and a data recording means for recording time-series data, and for calculating a load weight of the vehicle. Offset value resetting means for resetting the recording of the offset value output from the sensor corresponding to the empty state, and writing when the offset value resetting means resets the offset value to the data recording means And a means for measuring the loaded weight. 2. The writing means writes in the data recording means that the offset value has been reset, and at the same time writes the weight value calculated from the sensor output value. The loaded weight measuring device according to claim 1. 3. The loaded weight measuring device according to claim 1, wherein the data recording means is also used as a means for recording time-series data of a vehicle information recording device for collecting vehicle information. 4. The loaded weight measuring device according to claim 1, wherein the offset value resetting means is reset according to an empty vehicle information of a vehicle information collecting device.