JP3334826B2 - Loading weight measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load measuring apparatus for measuring the weight of a vehicle, especially a cargo carrier, to prevent overloading.

[0002]

2. Description of the Related Art A conventional load 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. If it did, an alarm was issued.

In calculating the loaded weight, a sensor output value in an empty state where no vehicle is loaded with a vehicle is recorded in advance as an offset value, and the offset value is subtracted from the sensor output value. The weight is calculated.

[0004]

As described above, in the conventional loading weight measuring apparatus, when calculating the loading weight, the sensor output value when the vehicle is empty is recorded as an offset value, and the offset value is calculated. The load weight was calculated by subtracting the value from the sensor output value.

[0005] The offset value is liable to change due to vibrations or the like caused by running of the vehicle, and when it is deemed to have changed, it is reset and a new offset value is recorded. When the offset value is reset, the vehicle is supposed to be reset when the vehicle is empty, but an erroneous loading weight is calculated when the vehicle is erroneously loaded with luggage.

The load weight measuring device is installed in order to prevent overloading of the vehicle. However, an illegal operation is performed so that the offset value is reset while the load is consciously loaded and the load is not overloaded. May be performed.
SUMMARY OF THE INVENTION 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-mentioned problems will be described with reference to FIG.
FIG. 1 is a basic configuration diagram of the present invention. In a loading weight measuring device that measures a loading weight based on a signal output from a sensor attached to a vehicle, a data recording unit 1 that records time-series data and an empty state for calculating a loading weight of the vehicle are supported. Offset value reset means 2 for resetting the recording of the offset value output from the sensor, and writing means for writing the reset to the data recording means 1 when the offset value reset means 2 resets the offset value. 3 is provided.

The writing means 2 writes the fact that the offset value has been reset to the data recording means 1 and simultaneously writes the weight value calculated from the sensor output value. Further, the data recording means 1 is shared with a means for recording time-series data of a vehicle information recording device for collecting vehicle information.

The resetting of the offset value reset means 2 is performed based on the empty information of the vehicle information collecting device.

[0010]

The offset value reset means 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 reset unit 2 resets the offset value, the writing unit 3 records the reset in the data recording unit 1.

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

The offset value of the offset value reset means 2 is reset based on the empty information of the vehicle information collecting device. As described above, every time the offset value is reset, the fact that the offset value has been reset is recorded, so that it can be known from the recorded time-series data whether a normal reset has been performed. .

Further, since the offset value is recorded as being reset and the weight value at that time is also recorded, it is known from the recorded weight value whether or not the offset value has been reset in a normal state, that is, in an empty state. be able to. In addition, the fact that the offset value is reset and the recording of the weight value at that time are shared with the recording of the time-series data of the vehicle information collecting device, so that 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 empty information of the vehicle information collecting device, the offset value can be automatically reset.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a block 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 for outputting 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 overload weight recording section, 15 is a weight calculation section, 16 is an overload determination section, 17 is an alarm / display section, 18 is an offset value recording section, 19 is an offset value reset section, and 20 is control for performing other controls. , 21 is an input unit, 22 to 24 are interfaces (I / O), 25 is a processor (CPU) that performs 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. Further, the V / F converter 12 includes an oscillator 12
a, resistor 12b, detector 12c, and V / F conversion circuit 1
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 DC by a detector, and a pulse having a frequency proportional to the DC voltage is output by a V / F conversion circuit 12d. 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 fluctuates slightly.

The detector 12c is connected to the transformer 11b.
Multiplication 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 spring, which transmit the weight of the vehicle to the front wheels and the rear wheels.

When a load is applied to the sensor 11, a pulse having a frequency corresponding to the applied weight is generated as shown in FIG.
It is output from the / F converter 12. Sensor 11 and V / F
Depending on the characteristics of the converter 12, there is a case where the relationship between the weight and the frequency changes linearly as shown in FIG. 10A, and a case where the relationship between the weight and the frequency changes nonlinearly as shown in FIG. 10B. .

FIG. 10A shows the weight conversion coefficient recording unit 13.
The conversion coefficient K _A for sensor characteristics shown in, and for the sensor characteristic indicated by (B), the conversion factor to the frequency H _T is the conversion point characteristics K _B1, H _T or more Then, _KB2 is recorded in advance. The overloaded weight recording unit 14 stores in advance a weight value that is determined to be overloaded corresponding to each of the sensors 11-1 to 11-n and a weight value that is determined to be overloaded with respect to the total weight loaded on the vehicle. Record it.

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. V / F converter 1 in a state where it is not performed
The frequency H ₀ output from 2 to record.

The weight conversion coefficient recording unit 13, the overloaded weight recording unit 14, and the offset value recording unit 18 are constituted by non-volatile memories so that the recorded data is not 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 unit for calculating vehicle data, 52 denotes a vehicle data recording unit for recording data calculated by the vehicle data calculating unit, and 53 denotes a vehicle data recording unit recorded on the vehicle data recording unit. An output information recording unit that records whether information is output, 54 is an output data creation unit that creates output data based on information recorded in the output information recording unit, and 55 is when an input signal is input to an external input channel. Is an external input processing recording section for recording the processing of the above, 56 is an external input processing starting section for starting the processing when a signal is input to the external input channel, and 59 is an input section.

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 denote interfaces (I / O), and reference numeral 63 denotes a processor (cpu) for performing processing. First, 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. As shown in FIG. 8, the input unit 59 outputs the numerical value “0”
9 "," actual / empty "to enter whether the vehicle is empty or real," high /-"to enter whether the vehicle is traveling on a highway or a general road, and input that data is to be written in the memory. In addition to “write”, the function key is composed of “f _{1 to} f ₈ ”.

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

The rows in FIG. 12 correspond to the items to be collected as vehicle information, such as vehicle code, integrated mileage, mileage on a general road with a real vehicle, mileage on a highway with a real vehicle, and mileage on a general road with an empty vehicle. In addition, the mileage of the empty highway, the actual vehicle and the empty general road travel time, the actual vehicle and the empty highway travel time, the maximum speed of the general and highway, the engine rotation time, the engine over rotation time, the engine speed, the general and highway speed Items such as over time are associated with each address.

The columns correspond to the types of data to be output via the card R / W 58. For example, at the time of leaving the vehicle, items "vehicle code", "integrated mileage", and "when leaving the vehicle""Time", and output items for outputting collected data, such as data of all items at the time of entry, 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 performed, and when "2" is recorded, the integration is performed from the external input channel. The pulse on time, "3"
Is recorded, the signal input from the input channel is used as a trigger to output as external event data.

That is, as shown in FIG. 12, when a pulse is input to the “external input CH3”, the “external event data 1” includes “the actual traveling distance of the actual vehicle” and “the external input CH1”.
And the number of pulses input from the external input CH2 and the pulse on time input from the external input CH2.
Output to a recording card (not shown) via W21.

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

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

The operation of the vehicle data calculation unit 51 is performed by time-division interrupt, and is started each time a pulse is input from the travel sensor and the engine rotation detection sensor via the I / O 61. If the input pulse is from the travel sensor,
Based on the input pulse, “Integrated mileage”, “Actual / empty / general / high-speed mileage”, “Actual / empty / general / high-speed mileage”, “general / highest maximum speed” and “general / high-speed Over time or the like is calculated.

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

In step S51, when the preparation for leaving the vehicle is completed and the data recording card 57 is inserted into the card R / W 58, the operation starts, and the output data creating section 54 outputs the "exit data" of the external input processing recording section 55. The item recorded in is read out. That is, in the case of FIG. 12, “vehicle code”, “integrated travel distance”, and “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 via the card R / W 58.
Record in 7. In the process S53, the output data creation unit 54
Determines whether the time is a time designated in advance by comparing it with the time of the clock unit. If the determination result is NO, the process proceeds to step S56.
On the other hand, in the case of YES, the process proceeds to step S54.

In step S54, the output data creation unit 54
Reads out the output items recorded in the "regular time data" of FIG. 12, reads out the data corresponding to the read out items from the vehicle data recording unit 52 in step S55, and reads the data from 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 an event has been input from the input unit 59. If the determination is NO, the process proceeds to step S59; 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” at the time of loading or “one-touch event B” at the time of unloading.

In step S57, the output data creation unit 54
Reads out the output item corresponding to the input key in FIG. 12, and proceeds to step S58 to read out the data corresponding to the read out item from the vehicle data recording unit 52 to read out the card R / W5.
8 and is recorded on the data recording card 57.

In step S59, the external input process starting unit 56
Determines whether a signal has been input from an external input channel via the I / O 60 or 62. If NO, the process proceeds to step S61; if YES, the process proceeds to step S60. Processing S6
0, the external input processing starting unit reads the record of the external input processing recording unit 55 corresponding to the external input channel to which the signal pulse has been input, activates the output data creating unit 54, reads out the record from the vehicle data recording unit 52, and reads the card R The data is recorded on the data recording card 57 via / W58.

In other words, in the case of FIG. 12, the actual travel distance on the general road, the count of the external input channel 1, the pulse on time of the external input channel 2, and the event occurrence time are output as the external event data 1. Also, I / O
When data is transferred from the display of the loaded weight via 60, the data is recorded on the data recording card 57 via the card R / W 58.

In step S61, the output data creation unit determines whether or not the output is the incoming data. If NO, the process proceeds to step S53 to repeat steps S53 to S61. If YES, the process proceeds to step S63. It is determined whether or not the vehicle has arrived,
When the work of the day is completed, the driver enters the input unit 5
When the entry data output key 9 is pressed, a pulse is sent out, and it is determined whether or not this pulse has been output.

In step S63, the output data creation unit 54
Are the output information recording unit 53 and the external input processing recording unit 55
The data corresponding to the record is read from the vehicle data recording unit 52 with reference to the record recorded in the card R / W5.
8, and the processing is terminated.

Next, the operation of the embodiment will be described with reference to FIG. In the 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. If NO, process S2
b, and in the case of YES, the process proceeds to step S2a, where a setting process described later with reference to FIG. 5 is performed.

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

In the processing S3, the control unit 20 controls the I / O 23
The frequency of the input pulse is measured. _{That, H i = N i · /} T o ... (1) However, H _i is the number of pulses of the i-th sensor is frequency T _o i th sensor for outputting a predetermined time (in seconds) N _i is T _o seconds The following calculation is performed to calculate the frequency H.

In step S4, as shown in FIG. 11, the control unit 20 determines whether or not a pulse has been input from a travel sensor installed on the vehicle via the I / O 22 during the counting of a certain time by a certain time timer (not shown). Is determined, and the determination is YE
In the case of S, the process shifts to step S5, waits for T _W seconds, and shifts to process S1.

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

That is, in the process S6, when a measurement value which cannot be obtained normally due to the inclusion of noise or the like is measured, an error is displayed and removed. In the process 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 _Ki is the weight conversion coefficient of the i-th sensor, H _O is the offset value of the i-th sensor, and H is the offset value of the i-th sensor. The calculation of the frequency is performed, and the load weight W is calculated by performing the addition of W = W ₁ + W ₂ +... + W _n (3).

[0052] Incidentally, FIG. 10 with respect to the sensor of the non-linear characteristics as shown in (B), H <W if H _T of (conversion point _{frequency) 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 step S9, the control unit 20 displays the load weight W calculated in step S8 on the alarm / display unit 17 and outputs it via the I / O 24. Further, 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, the information is recorded on the data recording card 57 of the vehicle information collecting device 50, and is 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 overload weight with reference to the data recorded in the overload weight recording unit 14,
If the determination is NO, the process moves to step S1.

In the process S11, if it is determined that the vehicle is overloaded, the alarm / display unit 17 sounds a buzzer and displays the overloaded vehicle. When it is determined that overloading is performed, a flag indicating overloading is set and output in addition to the determined sensor or the output value of the loaded weight.

By repeating the operation described above,
As shown in FIG._TwoAnd T _ThreeRunning pulse during
Is detected, T in process S5_WWhere to wait for seconds
Weight calculation is not performed by the_TwoCalculated
Issued weight W_TwoIs output.

After T _W seconds, at time T ₆ , the weight W ₃ is calculated, and the result is displayed. If a running pulse is input during the waiting of T _W seconds in the process S5, the reset is reset, and the waiting of T _W seconds is started from the input of a new running pulse. When the vehicle stops, the travel pulse is not output from the travel sensor, 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 It is displayed.

In the embodiment, the weight calculation is not performed when the running pulse is detected. However, the weight calculation is performed, or the weight before running is recorded and displayed. May be. Next, the operation of the installation process will be described with reference to FIG.

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

In step S24, the weight conversion coefficient K is input from the input unit 20, and the process proceeds to step S25, where the weight conversion coefficient K is 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, K ₂ and the conversion point frequency H _T be input and recorded.

[0061] In the process S26, and enter the overloaded weight W ₀ from the input unit 20 to the total loading weight and over product weight W ₁ to _W-m for each sensor, is recorded in the overload recording unit 14 proceeds to the processing S27. Next, a reset operation performed by the offset value reset unit 19 will be described with reference to FIG.

[0062] In process S22a, the offset value reset unit 19 reads the frequency H ₀₁ to H _0n pulse from V / F converter unit 12-1~n input through the I / O23, proceeds to process S22b To the offset value recording unit 18. That is, in steps S22a and S22b,
H ₀ described in equation (2) or (4) and (5) is recorded.

In step S22c, when the updating of the offset value recording is completed in step S22b, the fact that the offset value has been reset is transferred to the vehicle information collecting device 50 via the I / O 24, and recorded on the data recording card 57. At step S22d, the offset value recording unit 18 is set at step S22b.
Recorded H ₀₁ to H _0n to calculate the weight exerted read Te to each sensor to the weight calculated shifts to processing S22E I / O
The information is transferred to the vehicle information collection device 50 via the communication device 24 and recorded.

As described above, when the offset value is reset, the fact that the reset has been performed and the weight at the time of the reset are recorded, so that it can be known whether or not the reset has been normally performed. In the above-described embodiment, the reset and the weight of the reset value are recorded in the vehicle information collecting device. However, the recording of such information is performed by connecting a memory to the I / O 24 and recording the information in the memory. You may make it do.

[0065]

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

Further, since the offset value is recorded as being reset and the weight value at that time is also recorded at the same time, it is known from the recorded weight value whether or not the offset value has been reset in an empty state. be able to. In addition, the fact that the offset value is reset and the recording of the weight value at that time are shared with the recording of the time-series data of the vehicle information collecting device, so that 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 empty information of the vehicle information collecting device, the offset value can be automatically reset.

[Brief description of the 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 a sensor and a V / F converter of the 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 collection device of the embodiment.

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

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

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

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Data recording means 2 Offset value reset means 3 Writing means 11 Sensor 12 V / F conversion part 13 Weight conversion coefficient recording part 14 Overload weight recording part 15 Weight calculation part 16 Overload judgment part 17 Alarm / display part 18 Offset value Recording unit 19 Offset value reset unit 20 Control unit 21 Input unit 22 to 24 Interface (I / O) 25 Processor (CPU) 50 Vehicle information collection device 57 Data recording card

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-221902 (JP, A) JP-A-50-161532 (JP, A) Patent 3002469 (JP, B2) Patent 2719328 (JP, B2) Patent 2539624 (JP, B2) JP-B 62-31286 (JP, B1) JP-B 3-15967 (JP, B2) JP-B 6-52186 (JP, B2) (58) Fields surveyed (Int. Cl. ⁷⁾ G01G 19/08-19/12 B60P 5/00 G01G 23/37 G01G 23/42

Claims (4)

(57) [Claims] 1. A load weight measuring device for measuring a load weight based on a signal output from a sensor attached to a vehicle, a data recording means for recording time-series data, and a device 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 vehicle state, and writing when the offset value resetting means resets the offset value in the data recording means. Means for measuring the weight of a load. 2. The data writing means writes the fact that the offset value has been reset to the data recording means and simultaneously writes the weight value calculated from the sensor output value. The loaded weight measuring device according to claim 1. 3. The loaded weight measuring apparatus according to claim 1, wherein said data recording means is shared with a means for recording time-series data of a vehicle information recording apparatus for collecting vehicle information. 4. The loaded weight measuring apparatus according to claim 1, wherein resetting of the offset value resetting means is performed based on empty vehicle information of a vehicle information collecting apparatus.