JP2000111394A - Loading weight display device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a loading weight display device which is improved so as to display an accurate loading weight and improves the loading weight indicating accuracy. SOLUTION: A loading weight display device calculates a correction value which is a weight difference between a weight held when the vehicle is traveling and a weight when the hold is released after stopping in a correction weight calculating means 33B, Correction value is calculated by weight calculation means 33
A is added when calculating the weight applied to the vehicle in A, that is, the loaded weight. Then, the weight after the addition of the correction value is displayed by the display means 37, but the display control means 33C determines whether or not the correction value needs to be added based on the change in the output signal of the weight sensor. Is controlled to cancel the correction value from the calculation of the weight to be displayed next time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading weight display device for calculating the weight of a vehicle such as a truck and displaying the calculated weight.

[0002]

2. Description of the Related Art For example, in the case of Japan, the measurement of the load weight of a vehicle mainly targets a large vehicle such as a truck.
For example, it is performed for the purpose of preventing traffic accidents such as rollover due to overloading and promotion of vehicle deterioration.

Conventionally, the measurement of the weight of a loaded vehicle is carried out by placing the vehicle to be measured on a platform scale. However, since the facility is large and requires a large installation space, the number of platform scales that can be installed is limited, and many In addition to being unable to measure the vehicle,
The installation cost has increased. So, in recent years,
2. Description of the Related Art There is provided a loaded weight display device that is mounted on a vehicle itself, calculates a loaded weight, and displays the calculated weight.

In a conventional loading weight display device mounted on a vehicle, for example, front, rear, left and right portions of a loading frame and a front,
Attach a sensing element for weight measurement such as a strain gauge sensor to an arc-shaped leaf spring interposed between the left and right ends of both rear axles (axle),
The load weight is calculated based on the sum of the outputs of the sensing elements in proportion to the load applied to the front, rear, left and right sensing elements.

[0005] The calculated weight is displayed on the display unit for displaying the loaded weight. During the running of the vehicle, the load applied to each of the sensing elements changes, so that the accurate loaded weight is displayed. In addition, even if the vehicle is not in an overloaded state, it may be judged that the vehicle is overloaded and an erroneous alarm may be issued.Therefore, with the conventional loaded weight display device, the weight display is held at the start of traveling. I have.

After the vehicle stops, the loading / unloading switch is pressed when starting the loading / unloading operation.
The weight display that was held is released, and a new
The weight according to the unloading is displayed.

[0007]

In the above-mentioned conventional loading weight display device, if the held weight display is released after the vehicle stops, the loaded weight calculated at the time of release is held. If the weight has changed with respect to the weight that has been calculated, the change, that is, the weight difference is added to the weight calculated based on the output of each of the sensing elements as a correction value in the subsequent weight calculation. Then, the weight after the addition was displayed.

[0008] However, it has been found that the above-mentioned change is temporary, and when the loading / unloading operation is performed, the change and the deviation are eliminated. Then, the weight of the state where the correction value is added is displayed on the display section,
If the deviation is eliminated during the loading / unloading operation, there is a possibility that a weight far from the actual loaded weight will be displayed thereafter.
From this, it can be said that the above-mentioned conventional load weight display device has a low load weight indicating accuracy, and it can be said that there is room for further improvement.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide a loading weight display device which is improved so as to display an accurate loading weight and which improves the loading weight indicating accuracy.

[0010]

According to a first aspect of the present invention, there is provided a load weight display apparatus according to the present invention.
In a loading weight display device for displaying a loading weight based on a signal output from a weight sensor attached to a vehicle, weight calculating means for calculating a weight applied to the vehicle from an output signal of the weight sensor, and the weight calculating means A correction weight for calculating a weight difference between the weight held during running of the vehicle and the weight when the hold is released after stopping as a correction value added when calculating the weight applied to the vehicle. Calculating means, display means for displaying the weight applied to the vehicle calculated by the weight calculating means, and correcting the correction when it is determined that addition of the correction value is unnecessary based on a change in the output signal of the weight sensor. Display control means for controlling to cancel the value from the calculation of the weight applied to the vehicle to be displayed next time.

In the above configuration, the loading weight display device is
The corrected weight calculating means calculates a correction value, which is a weight difference between the weight held during running of the vehicle and the weight when the hold is released after stopping, and the corrected value is applied to the vehicle by the weight calculating means. That is, it is added when calculating the load weight. Then, the weight after the addition of the correction value is displayed by the display means, but the display control means determines whether or not the addition of the correction value is necessary based on the change of the output signal of the weight sensor. The control is performed so as to cancel the correction value from the calculation of the weight to be displayed next time. As a result, when the hold is released after the vehicle stops, the calculated load weight temporarily changes and shifts with respect to the held weight, and the shift is eliminated during the loading / unloading operation. However, the display control means determines whether or not the correction value needs to be added based on a change in the output signal of the weight sensor, and cancels the correction value from the calculation of the weight when unnecessary, so that the accurate loading weight can be obtained. Will be displayed. Therefore, it is possible to provide a loading weight display device with improved loading weight indicating accuracy.

According to a second aspect of the present invention, in the loading weight display device according to the first aspect, the correction weight calculating means releases the hold when the loading / unloading operation is started. It is characterized by judging that

In the above configuration, the release time of the hold is matched with the start of the loading / unloading operation, whereby the weight at the time of release of the hold used when the correction weight calculating means calculates the correction value is displayed on the display control means. Can be used as a criterion for judging the necessity of adding the correction value.

According to a third aspect of the present invention, in the loading weight display device according to the first or second aspect, the display control means is calculated based on an output signal of the weight sensor. The correction value is canceled when the weight difference between the current weight and the weight when the hold is released exceeds a predetermined value.

In the above arrangement, the correction value is canceled by the display control means when the difference between the current weight calculated based on the output signal of the weight sensor and the weight at the time when the hold is released exceeds a predetermined value. Done in From this, it is possible to determine that the above-described shift temporarily changed due to the loaded / unloaded weight has been eliminated, and it is possible to easily set the timing for canceling the addition of the correction value.

According to a fourth aspect of the present invention, in the load weight display device according to any one of the first to third aspects, after the correction value is canceled by the display control means, It is characterized in that the canceled state is maintained until the correction weight calculation means calculates.

In the above configuration, after the correction value is canceled by the display control means, the cancel state is maintained until the correction value is calculated by the correction weight calculation means. From this, it is possible to reliably prevent the re-addition of the correction value, which can occur when the timing of canceling the addition of the correction value is simply set to the change width of the output signal of the weight sensor.

[0018]

An embodiment of the present invention will be described below with reference to the drawings.

First, a schematic configuration of a loading weight display device according to the present invention will be described with reference to a basic configuration diagram of FIG.

A load weight display device according to the present invention is a load weight display device for displaying a load weight based on a signal output from a weight sensor attached to a vehicle, wherein the weight applied to the vehicle is obtained from an output signal of the weight sensor. The weight held during running of the vehicle and the hold after stopping are released as correction values to be added when the weight applied to the vehicle is calculated by the weight calculating unit 33A. Correction weight calculating means 33B for calculating a weight difference from the weight at the time of
A display means 37 for displaying the weight applied to the vehicle calculated in A, and when it is determined that addition of the correction value is unnecessary based on a change in the output signal of the weight sensor, the correction value is displayed next time. And display control means 33C for controlling the calculation so as to cancel the calculation based on the weight applied to the vehicle.

According to the loaded weight display device having such a configuration, the correction which is the weight difference between the weight held by the corrected weight calculating means 33B while the vehicle is running and the weight when the hold is released after the vehicle is stopped. The weight is calculated by the weight calculating means 33A, and the corrected value is added when calculating the weight applied to the vehicle, that is, the loaded weight. The weight after the correction value is added is displayed by the display means 37. That is, the display control unit 33C determines whether or not the correction value needs to be added based on the change in the output signal of the weight sensor, and cancels the correction value from the calculation of the weight to be displayed next time when unnecessary. When the hold is released after the vehicle stops, the calculated loading weight temporarily changes and deviates from the held weight, and the Even in a state such as is eliminated during work, it is possible to display the correct load weight by the display control unit 33C.

The correction weight calculating means 33B determines that the hold has been released when the loading / unloading operation is started, whereby the correction weight calculating means 33B calculates the correction value. Then, the weight at the time of releasing the hold used for the determination can be used as a criterion for judging the necessity of adding the correction value in the display control means 33C.

Further, the correction value is canceled by the display control means 33C when the weight difference between the current weight calculated based on the output signal of the weight sensor and the weight at the time when the hold is released exceeds a predetermined value. In this case, it is possible to determine that the above-described shift temporarily changed due to the loaded / unloaded weight has been eliminated. Accordingly, the timing for canceling the addition of the correction value can be easily set.

Further, after the correction value is canceled by the display control means 33C, the corrected weight calculation means 33B
Since the cancellation state is maintained until the calculation is performed in step 2, the re-addition of the correction value that can occur when the timing of canceling the addition of the correction value is simply set to the variation width of the output signal of the weight sensor is ensured. Can be prevented.

The specific configuration of the loading weight display device according to the present invention, which has been schematically described above, will be described in detail with reference to FIGS.

FIGS. 2A and 2B are explanatory views showing a vehicle location where a sensing element of a load weight display device according to a preferred embodiment of the present invention is provided, wherein FIG. 2A is a side view, and FIG. is there. FIG. 3 is an exploded perspective view of a structure for supporting the leaf spring of FIG. 2 on a carrier frame of a vehicle, and FIG. 4 is a cross-sectional view showing a sensing element provided in a shackle pin of FIG.

In FIGS. 2A and 2B, reference numeral 1 denotes a vehicle.
The vehicle 1 has wheels 3, a carrier frame 5, and a carrier 7.

The above-mentioned wheels 3 are provided on the front, middle, rear and left and right six wheels. At both ends. The loading platform 7 is supported on the loading platform frame 5. The front, middle and rear left and right spaces of the loading platform frame 5 are separated by leaf springs 11 at the left and right ends of the front, middle and rear axles 9. Respectively.

As shown in FIG. 3, the leaf spring 11 is formed in a substantially arcuate shape with a belt-like spring plate overlapped and convex toward the ground. The bracket 1 is supported by two brackets 13 attached at places spaced apart in front of and behind the vehicle 1. In particular, the rear end of the vehicle 1 with the leaf spring 11 is interposed between the bracket 13 and the leaf spring 11. The bracket 13 is swingably supported by the shackle 15. In the drawing, reference numeral 17 denotes a bracket 13 and a shackle 15.
2 shows a shackle pin for swingably connecting the shackle pins.

In the vehicle 1 having such a configuration, the loading weight display device includes a sensing element 21 (corresponding to a weight sensor) used to calculate the weight applied to the vehicle 1 and a loading weight meter 31 (see FIG. 6). The sensing element 21 is disposed in each of the shackle pins 17 for connecting the shackle 15 and the six brackets 13 on the left, right, front and rear.

In the present embodiment, each of the sensing elements 21 is formed of a magnetostrictive gauge sensor, and is accommodated in a hole 17a drilled from one end of the shackle pin 17 along the axial direction as shown in FIG. The holding member 19 is attached to the web 19a. The sensing element 2
When 1 is a magnetostrictive type, it is fitted into a receiving hole (not shown) formed in the web 19a.

As shown in the block diagram of FIG. 5, each of the six left and right front, middle and rear sensing elements 21 disposed in the six right and left shackle pins 17 is a sensor 23 and a voltage sensor. / Frequency converter (hereinafter abbreviated as V / F converter) 25.

The sensor 23 comprises a magnetostrictive element 23a and a transformer 23b having the magnetostrictive element 23a as a magnetic path. The V / F converter 25 includes the transformer 2
An oscillator 25a connected to the primary winding of the transformer 3b, a detector 25b connected to the secondary winding of the transformer 23b, and a V / F conversion circuit 25c connected to the detector 25b are provided.

The sensing element 21 includes an oscillator 25a
A current is caused to flow through the primary winding of the transformer 23b by the output signal from the transformer 23b, thereby inducing an AC voltage in the secondary winding of the transformer 23b. The AC voltage is converted by the detector 25b into a DC voltage. The / F conversion circuit 25c is configured to convert the DC voltage into a pulse signal having a frequency proportional to the voltage value and output the pulse signal to the outside.

A high-resistance resistor 25d is connected between the oscillator 25a and the primary winding of the transformer 23b, and is induced in the primary winding of the transformer 23b by the resistor 25d. The voltage value of the AC voltage
There is no change even if the output signal of a slightly fluctuates. The conversion of the AC voltage induced in the secondary winding of the transformer 23b into the DC voltage by the detector 25b is performed by multiplying the AC voltage by the voltage generated at both ends of the resistor 25d. , The noise component contained in the AC voltage is reduced.

In the sensing element 21, the load applied to the magnetostrictive element 23a changes the magnetic permeability of the magnetostrictive element 23a, and is thereby induced in the secondary winding of the transformer 23b by the output signal from the oscillator 25a. When the AC voltage changes, the frequency of the pulse signal output from the V / F conversion circuit 25c increases or decreases.

The calculation of the load applied to the vehicle 1 based on the outputs of the six front, middle, rear, left and right sensing elements 21 disposed in the four front, middle, rear, right and left shackle pins 17 is shown in FIG. As shown in the front view of FIG. 6, the operation is performed by a microcomputer (hereinafter abbreviated as “microcomputer”) 33 provided in a loading weighing scale 31 constituting the loading weight display device of the present invention, which is disposed in the vehicle 1. It has become.

A load weight display section 37 (display means) for displaying the load weight calculated by the microcomputer 33 as the weight applied to the vehicle 1 is provided on the front surface 31a of the load weight meter 31. An overload display lamp 41 for displaying that the load exceeds a predetermined maximum load, an alarm buzzer 43 for informing an overload state, an offset adjustment value setting key 45, and an overload weight setting key. 47, a numeric keypad 53, a reset key 54, a set key 55, a loading / unloading switch 59, and the like.

As shown in the block diagram of FIG. 7, the microcomputer 33 includes a CPU (Central Processing Unit), a central processing unit, a weight calculating unit, a corrected weight calculating unit, and a display controlling unit) 33a, and a RAM (Random Access Memory). 33
b and a ROM (Read-Only Memory) 33c.

The CPU 33a has a nonvolatile memory (NVM) in which stored data is not lost even when power supply is cut off.
35, the offset adjustment value setting key 45, an overload weight value setting key 47, a numeric keypad 53, a reset key 54, a set key 55, a loading / unloading key used for calculating the loading weight and determining the overloading based on the result. The switches 59 are directly connected to each other.
The respective sensing elements 21 and a travel sensor 57 that generates a travel pulse in accordance with the travel of the vehicle 1 are connected via 3d.

Further, the loading weight display section 37, the CPU 33a via the output interface 33e.
An overload display lamp 41 and an alarm buzzer 43 are connected to each other.

The RAM 33b has a data area for storing various data and a work area used for various processing operations.
2b timer area, 6 second timer area, HF flag area, KF flag area,
SP flag area, this calculated weight W ₁ area, HKF flag area, the previously calculated weight W ₂ area, displaying the weight W _D area, reference weight W _S area, the correction value Wa area, canceling the upper limit value Wb area, canceling the lower limit -Wb Areas and the like are provided.

The ROM 33c stores a control program for causing the CPU 33a to perform various processing operations.

Although detailed description is omitted in the NVM 35, tables such as offset adjustment values, characteristic correction values, and error correction values for the output pulse signals of the respective sensing elements 21 and weight conversion formulas are provided in advance. Is stored.

Next, the processing performed by the CPU 33a in accordance with the control program stored in the ROM 33c will be described with reference to the flowcharts of FIGS.

An accessory (AC) (not shown) of the vehicle 1
C) When the key is first turned on, the power of the weighing scale 31 is turned on and the microcomputer 33 is started to start the program, and the CPU 33a performs an initial setting according to a main routine shown in a flowchart of FIG. 9 (step S1). ).

In this initial setting, the 2-second timer area, the 6-second timer area, the HF flag area, the KF flag area, the SP flag area, and the weight calculated this time, which are sequentially denoted by reference numerals 33b-1 to 33b-13 in FIG. W ₁ area, HKF flag area, the previously calculated weight W ₂ area, performs display by weight W _D area, reference weight W _S area, the correction value Wa area, canceling the upper limit value Wb area, the initialization of such cancellation lower limit -Wb area With the weighing scale 3
The initial display displayed on the loading weight display section 37 is set to 0 ton. .

The HF flag area 33b-3 has 2
The 2 second timer formed in the second timer area 33b-1 is set to 0 every time two seconds are counted, and the HF flag area 33b-3 is set.
Is set to 1 each time a pulse is input from the travel sensor 57 when is 0. The KF flag area 33b-4 is set to 1 each time the 6-second timer formed in the 6-second timer area 33b-2 starts measuring the time of 6 seconds, and is set to 0 each time the 6-second timer finishes measuring the time of 6 seconds. Is done. SP flag area 33
b-5 is set to 0 immediately before the start of the 2-second timer formed in the 2-second timer area 33b-1. When the HF flag area 33b-3 is 0, every time a pulse from the travel sensor 57 is input. It is set to 1.

In the next step S3, the SP flag area 33b-5 is set to 0, and in the following step S5, a time counting operation of a 2-second timer which is a display update timer is started. In the subsequent step S7, the weight sensor signal input to the input interface 33d is detected, and based on this detection, the weight sensor signal is corrected in step S9 using the offset adjustment value, the characteristic correction value, the error correction value, and the like. And the weight W
Is calculated.

[0050] In step S11, to the previously calculated weight W ₂ area 33b-8 stores the contents of the currently calculated weight W ₁ area 33b-6, calculated this time weight calculation weight W calculated in step S9 in step S13 W ₁
It is stored in area 33b-6.

Thereafter, in step S15, step S5
It is determined whether or not the time counted by the 2-second timer formed in the 2-second timer area 33b-1 started at 2 seconds has reached 2 seconds.
Wait for this determination to be YES.

When the determination in step S15 is YES, 2
When the second has elapsed, the process proceeds to step S17 to set the HF flag area 33b-3 to 0, and then proceeds to step S19. In step S19, the SP flag area 33b-
It is determined whether or not 5 is 1. That is, the travel sensor 5 is input to the input interface 33d within the past two seconds.
It is determined whether the pulse from No. 7 is input. If the determination in step S19 is ΝO, that is, if no pulse has been input to the input interface 33d within the past two seconds, the process proceeds to step S21; if YES, that is, the input interface 33d within the past two seconds.
If a pulse has been input to step S23, the process proceeds to step S23.

In step S23, the HKF flag area 33b-7 is set to 1, and the flow advances to step S25. At step S25, the 6-second timer area 33b-2
The counting of the second timer is started, and the KF flag area 33b-4 is set to 1 in the next step S27.

When the determination in step S21 is ΝO, that is, when the 6-second timer in the 6-second timer area 33b-2 is counting, or after the end of step S27, the process proceeds to step S29 and starts in step S25. It is determined whether the time of the 6-second timer has reached 6 seconds.

When the determination in step S29 is ΝO, the process returns to step S3. When the determination is YES, the KF flag area 33b-4 is set to 0 in step S31, and then the process returns to step S3.

The CPU 33a executes a pulse interrupt routine shown in FIG. 10 when a pulse is input from the travel sensor 57 to the input interface 33d. When the loading / unloading switch 59 is depressed, the loading / unloading SW interrupt routine shown in FIG. 11 is executed.

In FIG. 10, in the first step S51 of the pulse interrupt routine processing, the HF flag area 3
It is determined whether or not 3b-3 is 1, that is, whether or not there is a pulse input within two seconds before. When the determination of this process is $ O, the process proceeds to step S53, where the SP flag area 33b-5 is set to 1, and then proceeds to step S55.

In step S55, the HF flag area 3
After 3b-3 is set to 1, the process returns to the main routine shown in FIG. If the determination in step S51 is YES, that is, if there is a pulse input within two seconds before, steps S53 and S55 are skipped and the process returns to the main routine.

On the other hand, in the loading / unloading SW interrupt routine processing, as shown in FIG. 11, in a first step S61, it is determined whether or not the HKF flag area 33b-7 is "1". If YES, the next step S6
The routine proceeds to 3 and returns to the main routine shown in FIG. 9 when ΝO.

In step S63, the KF flag area 33
It is determined whether or not b-4 is 0. If the determination is YES, the process proceeds to step S65, and if ΝO, the process returns to the main routine shown in FIG. Then, step S6
At 5, the HKF flag area 33b-7 is set to 0, and the routine proceeds to step S67.

In step S67, the calculation in step S9 is performed.
The calculated weight W that was output is referred to as the reference weight W. _SArea 33b-1
Store to 0. As a result, when loading / unloading work starts,
The calculated weight W is held and calculated in the next step S69.
Is added when calculating the load weight applied to the vehicle 1
One reference value to determine whether to cancel the correction value and
can do.

Steps further proceeding from step S67
In S69, the calculated weight W calculated in step S9 is calculated.
Above display weight W_DDisplay weight stored in area 33b-9
Quantity W _DBy calculating the weight difference with the vehicle 1,
The above-mentioned correction value Wa to be added when calculating the loading weight is calculated.
Perform the following processing. That is, the display weight W is calculated from the calculated weight W._DReduced
The weight difference is then stored in the correction value Wa area 33b-11.
Store. And then, the main route shown in FIG.
Return to

[0063] From the above, the pressing operation of loading and unloading switch 59, HKF flag area 33b-7 is 0, the display weight W _D that have been held until it is released in subsequent processing.

Returning to FIG. 9, when the determination in step S21 is YES, that is, when the KF flag area 33b-4 indicating that six seconds have elapsed since the vehicle stopped is 0, the flow proceeds to step S35. It is determined whether or not the HKF flag area 33b-7 is 0. This judgment is ΝO
In other words, when 6 seconds have elapsed since the vehicle stopped but there is no operation of the loading / unloading switch, the process returns to step S3. When the determination is YES, if six seconds have elapsed since the vehicle stopped and the loading / unloading switch has been operated, the process proceeds to step S35.

In step 35, it is determined whether or not the weight difference between the calculated weight W, which is the current weight, and the time when the hold is released after stopping exceeds a predetermined value. That is, the weight difference between the reference weight W _S obtained in calculated weight W and the processing 67, determines whether beyond the scope of the cancellation limit Wb area 33b-12 and the cancel lower limit -Wb area 33b-13 If it is within the range, that is, if YES, the next step S3
Skip to step S39 and proceed to step S39. On the other hand, if it exceeds the range, that is, if NO, it is determined that the temporarily changed deviation has been resolved, and the process proceeds to the next step S37.

In step S37, the correction value Wa is set to W
It is assumed that there is no weight difference when a = 0, and the addition of the correction value Wa in the next step S39 is substantially canceled.

Since the correction value Wa is canceled, the correction value Wa is not added until the next calculation is performed in step S69. Thereby, the above step S35
In the case where the weight difference exceeds the range once but falls within the range next time, it is possible to prevent the canceled correction value Wa from being added again.

In step S39, the current calculated weight W
₁ area 33b-6 and the previously calculated weight W ₂ area 33
the difference of the contents of b-8 displayed a weight W _D area 33b-9
And the correction value Wa area 33
It calculates a new display weight W _D obtained by adding the contents of b-11. Then, it outputs the new display weight W _D that this calculated with respect to the dead weight display unit 37 at the next step S41, the display weight W _D area 3 further in the next process 43
3b-9 is stored in place of the previous one, and the process returns to step S3.

As described above, when the loading / unloading operation is performed after the loading / unloading switch is pressed after stopping, 2
Determining a difference in weight for calculating for every second, and displays by adding the correction value Wa and increment or decrement of the weight in the current display weight W _D.

FIG. 12 is an explanatory diagram showing the relationship between the sensor output and the display value at the time of releasing the hold. The vertical axis indicates the load weight (t, ton), and the horizontal axis indicates the time change. To explain the operation based on this figure, the loading operation is performed from the tare state of the vehicle 1, and the loaded weight increases to the right. When the loading operation is completed, a constant load weight is displayed in the horizontal direction. When the vehicle 1 is running, the displayed weight is held in order to stabilize the displayed weight.

Thereafter, when the vehicle is stopped and the loading / unloading switch is pressed to perform the loading / unloading operation, the hold is released. At this time, the weight difference between the displayed weight at the time of hold and the weight after release (the solid line in the figure indicates the display value, that is, the displayed weight, and the broken line indicates the weight calculated based on the sensor output. The difference is the weight difference.) Becomes the above-mentioned correction value Wa, and will be added in the subsequent calculation of the loaded weight.

The upward rise in the figure indicates a loading operation and the downward downward movement indicates an unloading operation. When these operations are advanced and the sensor output changes, the added correction value is canceled. That is, ± 0.7t in FIG.
When there is a change in the load weight (tons), the addition of the correction value generated when the hold is released is canceled.

Therefore, when the hold is released after the vehicle stops, the calculated load weight is temporarily changed and shifted with respect to the held weight, and the shift is eliminated during the loading / unloading operation. Even if the state is incorrect, the necessity of adding the correction value is determined based on the change in the output signal of the weight sensor, and when it is unnecessary, the correction value is canceled from the calculation of the weight. The displayed loading weight is displayed, and the loading weight indicating accuracy is remarkably improved.

In addition, it goes without saying that the present invention can be variously modified and implemented without departing from the gist of the present invention.

[0075] It is also possible to display with the display weight W _D correction value Wa described above. Also, it is possible to release the hold after a certain period of time after stopping,
It is not limited to the pressing operation of the loading / unloading switch.

[0076]

As described above, according to the first aspect of the present invention, the loaded weight display device is configured to display the weight held by the corrected weight calculating means during running of the vehicle and the hold after stopping. A correction value that is a weight difference from the weight at the time of release is calculated, and the correction value is added when the weight applied to the vehicle, that is, the loaded weight is calculated by the weight calculation means. Then, the weight after the addition of the correction value is displayed by the display means, but the display control means determines whether or not the addition of the correction value is necessary based on the change of the output signal of the weight sensor. The control is performed so as to cancel the correction value from the calculation of the weight to be displayed next time. As a result, when the hold is released after the vehicle stops, the calculated load weight temporarily changes and shifts with respect to the held weight, and the shift is eliminated during the loading / unloading operation. However, the display control means determines whether or not the correction value needs to be added based on a change in the output signal of the weight sensor, and cancels the correction value from the calculation of the weight when unnecessary, so that the accurate loading weight can be obtained. Will be displayed. Therefore, there is an effect that it is possible to provide a loading weight display device with improved loading weight indicating accuracy.

According to the second aspect of the present invention, the release time of the hold is adjusted to the start of the loading / unloading operation, whereby the hold used when the correction weight calculating means calculates the correction value. There is an effect that the weight at the time of release can be used as a criterion for determining whether the display control means needs to add the correction value.

According to the third aspect of the present invention, the correction value is canceled by the display control means based on the current weight calculated based on the output signal of the weight sensor and the weight when the hold is released. This is performed when the weight difference exceeds a predetermined value. From this, it is possible to determine that the above-mentioned shift temporarily changed due to the loaded / unloaded weight has been eliminated, and it is possible to easily set the timing for canceling the addition of the correction value. .

According to the present invention, after the correction value is canceled by the display control means, the canceled state is maintained until the correction weight is calculated by the correction weight calculating means. From this, it is possible to reliably prevent the re-addition of the correction value which can occur when the timing of canceling the addition of the correction value is simply set to the change width of the output signal of the weight sensor.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a loading weight display device according to the present invention.

FIG. 2A is a side view showing a vehicle location where a sensing element of the loaded weight display device according to the present invention is disposed, and FIG.
FIG. 4 is a plan view showing a vehicle location where a sensing element of the loaded weight display device according to the present invention is disposed.

FIG. 3 is an exploded perspective view of a structure for supporting the leaf spring of FIG. 2 on a carrier frame of a vehicle.

FIG. 4 is a sectional view showing a sensing element provided in the shackle pin of FIG. 3;

FIG. 5 is a circuit diagram partially showing a configuration of a sensing element shown in FIG. 4;

FIG. 6 is a front view of a load scale of the load weight display device according to the present invention.

FIG. 7 is a block diagram illustrating a hardware configuration of a microcomputer provided in the weighing scale shown in FIG. 6;

FIG. 8 is an explanatory diagram for each area allocated to a RAM of a microcomputer provided in the weighing scale shown in FIG. 6;

FIG. 9 is a flowchart of a main routine showing processing performed by a CPU according to a control program stored in a ROM of a microcomputer provided in the weighing scale shown in FIG. 6;

FIG. 10 is a flowchart showing a pulse interrupt routine process in which an interrupt is made when the main routine shown in FIG. 9 is executed.

FIG. 11 is a flowchart showing a loading / unloading SW interruption routine process in which an interruption is made when the main routine shown in FIG. 9 is executed.

FIG. 12 is an explanatory diagram of a relationship between a sensor output and a display value when a hold is released.

[Explanation of symbols]

 Reference Signs List 1 vehicle 9 axle 21 weight sensor 31 loading weight meter 33 microcomputer 33a CPU 33b RAM 33c ROM 33A weight calculation means 33B correction weight calculation means 33C display control means 37 loading weight display section (display means)

Claims (4)

[Claims] 1. A load weight display device for displaying a load weight based on a signal output from a weight sensor attached to a vehicle, a weight calculating means for calculating a weight applied to the vehicle from an output signal of the weight sensor. A weight difference between the weight held during running of the vehicle and the weight when the hold is released after stopping, as a correction value added when calculating the weight applied to the vehicle by the weight calculating means, A weight calculating means for calculating the weight, a display means for displaying the weight applied to the vehicle calculated by the weight calculating means, and it is determined that addition of the correction value is unnecessary based on a change in an output signal of the weight sensor. Display control means for controlling the correction value to be canceled from the calculation of the weight applied to the vehicle to be displayed next time, and a load weight. Display devices. 2. The load weight display device according to claim 1, wherein the correction weight calculation means determines that the hold has been released when the loading / unloading operation is started. . 3. The load weight display device according to claim 1, wherein the display control means is configured to control a display when the current weight and hold calculated based on an output signal of the weight sensor are released. The loaded weight display device, wherein the correction value is canceled when the weight difference between the weights exceeds a predetermined value. 4. The loading weight display device according to claim 1, wherein after the correction value is canceled by the display control means, the state is canceled until the correction weight calculation means calculates the correction value. The loading weight display device characterized by maintaining the following.