JP2682597B2 - Vehicle load 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 vehicle load weight measuring device, and more particularly to a device for measuring a vehicle load weight by detecting a load acting on an axle of a large vehicle such as a truck.

[0002]

2. Description of the Related Art Conventionally, as this type of measurement, each wheel is accurately placed on a loading plate equipped with a load converter, and the weights obtained based on the signals from the respective load converters are added. The weight of the vehicle itself is subtracted from this to obtain the loaded weight.

However, the loading plate equipped with the load converter as described above requires a large amount of equipment and costs a lot for the equipment itself and its installation. Therefore, the installation place and the number of installed equipment are very limited. It was a thing. Therefore, the number of vehicles that can receive the load weight measurement was very small, which was insufficient to prevent overloading.

In order to solve such a problem, for example, in Japanese Examined Patent Publication No. 3-15967, a load signal from a detector attached to an axle for detecting a strain generated on the axle to detect a load is detected by a cable. There has been proposed a device that guides the load to an indicator provided in the vehicle cab to calculate and display the loaded weight.

Since the proposed device is always mounted on a vehicle, it is not necessary to mount the vehicle on a loading plate installed on a flat place, and the load weight can be measured at any place for loading and unloading. become.

[0006]

However, in the above-mentioned proposed apparatus, the indicator for displaying the loaded weight is provided only in the vehicle cab. For this reason, when it is desired to know the loaded weight during the loading / unloading work, it is necessary to go to the operator's cab each time, and there is a problem that there is no freedom to perform the loading / unloading work while looking at the display.

Therefore, in view of the above-mentioned conventional problems, the present invention makes it possible to monitor the loaded weight at any place outside the operator's cab, and to perform the loading / unloading work while monitoring the loaded weight. The purpose is to provide a measuring device.

[0008]

To achieve the above object, a vehicle loading weight measuring apparatus according to the present invention comprises a multiplex communication line 11 arranged on a vehicle as shown in the basic configuration diagram of FIG. A plurality of monitor connection terminals 15 ₁ connected to the multiplex communication line 11 and distributed and installed outside the vehicle
15 ₃ and at least three load detectors 14 _{1 to} 14 ₄ each having a load sensor 14 d for detecting a load acting on the axle of the vehicle and a communication function, and connected to the multiplex communication line 11 respectively. It is connected to the multiplex communication line 11, receives a load signal corresponding to the load detected by the load detectors 14 _{1 to} 14 ₄ from each load detector via the multiplex communication line 11, and outputs the received load signal. Weight measuring means 13a for measuring the loaded weight of the vehicle based on
₁ and the monitor connection terminals 15 ₁ to 15 ₃ connected to the multiplex communication line 11 so as to be freely contactable and separable, and the loaded weight of the vehicle measured by the weight measuring means 13a ₁ is transmitted via the multiplex communication line 11 receiving Te, it is characterized in that it comprises an external monitor display 17 having a display unit 17a ₁ for displaying the load weight thus received.

[0009]

With the above structure, at least three load detectors 14 _{1 to} 14 ₄ each having a communication function and a load sensor 14d for detecting a load acting on the axle of the vehicle are connected to the multiplex communication line 11, respectively. The weight measuring means 13a ₁ receives a load signal corresponding to the load detected by these load detectors 14 _{1 to} 14 ₄ from each load detector via the multiplex communication line 11, and based on the received load signals. Measure the weight of the vehicle. Then, the external monitor display unit 17, is connected in a freely separable to a monitor connected to connecting terminals 15 ₁ to 15 ₃ to the multiplex communication line 11, the weight measuring unit 13a ₁ multiplex communication line the loading weight of the vehicle as measured by 11 received via the, so to display the load weight thus received on the display unit 17a _1.

Since the monitor connection terminals 15 ₁ to 15 ₃ are installed dispersedly outside the vehicle on the multiplex communication line 11 routed to the vehicle, arbitrary monitor connection terminals 15 ₁ to 15 3
By connecting the external monitor display 17 to ₃ ,
Vehicle loading weight can be monitored at any location.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is an overall configuration diagram showing an embodiment of a vehicle load weight measuring apparatus according to the present invention. In the figure, 11 is L
The multiplex communication line 11 is a twisted pair line for the AN. The multiplex communication line 11 is arranged in the central portion along the traveling direction of the vehicle body from the cab to the rear end of the vehicle body under the cargo bed. A main controller 13 is connected to the multiplex communication line 11 inside the cab 12, and four load detectors 14 _{1 to} 14 ₄ and three monitor connection terminals 15 ₁ to 15 ₃ and a load control circuit 16 are provided outside the cab. Each is connected.

The main controller 13 comprises four load detectors 1.
The load signals from 4 _{1 to} 14 ₄ are input to calculate and display the loaded weight. As shown in FIG. 3, a control unit 13 a configured by a CPU operating according to a predetermined control program is provided. Have. The control unit 13a and the communication control circuit 13b and the transmission / reception circuit 13 are provided so that communication with other devices can be performed via the multiplex communication line 11.
In addition to being connected to the multiplex communication line 11 via c, a display 13e is connected to the control section 13a via a display driver 13d.

The control unit 13a starts its operation when the power switch 13f is turned on, and requests each of the load detectors 14 _{1 to} 14 ₄ to send out a load signal corresponding to the load detected by each of them, and in response to this request. The load signals transmitted by the vehicle are sequentially input, the loaded weight of the vehicle is calculated based on the input load signal, and the loaded weight obtained by this calculation is displayed on the display 13e.
To be displayed. Further, the loaded weight obtained by the calculation is temporarily stored in the memory in the control unit 13a, and in response to a request received from the outside via the communication control circuit 13b and the transmission / reception circuit 13c, the communication control circuit 13b and the transmission / reception circuit 13c. Is transmitted to the multiplex communication line 11 via.

The load detectors 14 _{1 to} 14 ₄ are provided corresponding to the left and right front wheels and the left and right rear wheels of the vehicle, respectively, and each is composed of a CPU that operates according to a predetermined control program, as shown in FIG. It has a computing unit 14a. The arithmetic unit 14a is connected to the multiplex communication line 11 via the communication control circuit 14b and the transmission / reception circuit 14c so that the arithmetic unit 14a can communicate with other devices via the multiplex communication line 11, and the arithmetic unit 14a. A load sensor 14d provided corresponding to each wheel is connected to 14a in order to detect a load acting on each wheel. As the load sensor 14d, a strain gauge, a strain gauge, a load pin, or the like can be applied.

The calculation unit 14a calculates the load based on the detection signal from the load sensor 14d, and the load obtained by this calculation is temporarily stored in the memory in the calculation unit 14a, and this is stored in the communication control circuit 14b and the transmission / reception circuit 14c. In response to a transmission request received from the outside via the communication control circuit 14b
And to the multiplex communication line 11 via the transmission / reception circuit 14c.

Each of the monitor connection terminals 15 ₁ to 15 ₃ is
Since it is distributed and arranged outside the vehicle exposed to rainwater, it has a structure with a cap cover.
5 ₁ is on the left side of the car body, the other 15 ₂ is on the right side of the car body,
The remaining one 15 ₃ is arranged at the rear end of the vehicle body.
Then, the desired one 15 ₁ disposed on the left side of the vehicle body of the monitor connection terminal, an external monitor display device 17 is connected freely separable.

The external monitor display 17 has a display unit 1 on its front panel surface 17a, as shown in the front view of FIG.
7a ₁ and various operation buttons 17a _{2 to} 17a ₆ are arranged. The display unit 17a ₁ is a large-sized L in consideration of visibility.
It can be preferably constructed by a CD display panel. As shown in FIGS. 6 and 7, the back surface of the external monitor display 17 is attached to a vehicle body which is usually made of iron so as to be attachable and detachable in consideration of the attachability to any place. An adsorption device 17b including a magnet 17b ₁ and an adsorption yoke 17b ₂ is provided at each corner. Then, from the lower side of the external monitor display unit 17, a connection line 17c having a connector 17c ₁ connected to the monitor connection terminal at its end is drawn out. Further, as shown in FIG. 8, the external monitor display 17 connected to the monitor connection terminal 15 ₁ arranged on the left side of the vehicle body by the connector 17c ₁ in a freely attachable / detachable manner has the suction device 17b on the rear surface thereof made of the iron body B.
By adsorbing it to the vehicle, it can be placed anywhere outside the cab.

Of the operation buttons, the power button 17a ₂ is for turning on / off the power, and the reset button 17a.
a ₃ is for resetting the display currently displayed on the display unit 17a ₁ , the setting button 17a ₄ is for setting a control load value, and the MR button 17a ₅ is a display unit for loading the measured load weight. intended for display on 17a _1, UD buttons 17a ₆ is for to up and down the set value in setting the control load value.

FIG. 9 shows a circuit configuration of the external monitor display unit 17. The external monitor display unit 17 has a control section 17d composed of a CPU which operates according to a predetermined control program. The control unit 17d uses the multiplex communication line 1
1 is connected to the multiplex communication line 11 via the communication control circuit 17e and the transmission / reception circuit 17f so that communication with other devices can be performed via the communication line 1. And this control unit 1
The operation buttons 17a _{2 to} 17a ₆ are connected to 7d, and the display section 17a ₁ is connected to the 7d via a display driver 17g. The external monitor display unit 17 has a built-in backup power supply battery (not shown).

The load control circuit 16 (FIG. 2) is a circuit for performing control on the basis of the control load value set in the external monitor display unit 17. In this circuit, the motor 19 is driven via the connector 18. A motor driver 20 is connected, and a buzzer 22 is connected via an amplifier 21. The motor 19 may be one that drives a belt conveyor or a pump used when loading and unloading a load. Then, when the loading / unloading weight of the vehicle reaches the control weight value,
The load control circuit 16 can automatically stop the drive of the motor 19 and ring the buzzer 22 to notify that the loaded / unloaded weight has reached the control weight value.

Although the load control circuit 16 and the motor driver 20 are connected to each other by a connector, they may be wirelessly controlled instead.

With the above configuration, the main controller 13
Has its communication function when the power switch 13f is turned on.
The control unit 13a controls the load via the multiplex communication line 11
Double detector 14₁~ 14_FourReceives a load signal from
The load weight is calculated by calculating and processing based on these load signals.
If the obtained load weight is stored and stored in the memory,
Both are displayed on the display 13e. While any monitor
Connection terminal 15₁~ 15 _ThreeExternal monitor display connected to
The device 17 transfers the data of the loaded weight to the main controller 13.
Sends the requested message and, in response, sends the main controller 1
3 receives the loaded weight value sent from the control unit 17
a is the display unit 17a₁To display.

Therefore, the external monitor display device 17 is installed outside the driver's cab by being attracted to a magnet at an arbitrary position on the vehicle body.
The load weight of the vehicle can be monitored by looking at the display on the display unit 17a ₁ . In particular, since the work can be performed while observing the display of the external monitor display unit 17 when loading and unloading a fixed weight of an irregularly shaped load, accurate weight management can be easily performed.

Further, when monitoring the loaded weight of the traveling vehicle, it is possible to easily read and monitor the present weight and the past weight data stored in the memory simply by connecting the external monitor display unit 17. is there. Further, the weight set value input to the load control circuit 16 is set by the external monitor display unit 17, and the motor 19 is driven by this set value to automatically carry out loading / unloading up to a predetermined weight and stop, An alarm can be issued.

The details of the operation of the apparatus outlined above are shown in FIG. 10 showing the work performed by the CPU constituting the control unit and the arithmetic unit.
The following is a description with reference to the flowchart of FIG.

C constituting the control section 13a of the main controller 13
The PU performs the work shown in the flowchart of FIG.
In the first step S1, the power switch 1
Wait for 3f to be turned on, then step when turned on
Proceed to S2 and load detector 14 ₁~ 14_ThreeLoad data from each
Data sequentially, and then in step S3
Calculate the loaded weight by performing arithmetic processing based on the data
You. By executing this step S2, the control unit 13a
Load detector 14₁~ 14_FourAccording to the load detected by
Load signal is transmitted through the multiplex communication line 11 to each load detector.
And loading the vehicle based on the received load signal.
Weight measuring means 13a for measuring weight₁Work as

The loaded weight obtained by the calculation of the above step S2 is held and stored in the memory, but when it is the same as the one that was held and stored immediately before, it is not newly held and stored.
Only when it is different from the one stored and stored immediately before, it is stored and stored by replacing it with the one stored and stored previously. After that, the process proceeds to step S4 to display the loaded weight obtained by this calculation process on the display unit 13e.

After that, the routine proceeds to step S5, where it is determined whether or not there is a request signal from the external monitor display unit 17. When the determination at step S5 is NO, the routine proceeds to step S6 where the request signal from the load control circuit 16 is sent. It is determined whether or not there is. When the determination in step S5 is YES, that is, when there is a request signal from the external monitor display unit 17, the process proceeds to step S7, and the loaded weight data stored and stored in order from the last loaded and stored stored weight is removed. It is transmitted to the attached monitor display unit 17. On the other hand, if the determination in step S6 is YES, that is, if there is a request signal from the load control circuit 16, step S8
Then, only the loaded weight data stored and stored last is applied to the load control circuit 16 and transmitted.

The last loaded and stored load weight data is sequentially retained and stored as past load weight data every time the power switch 13f is turned off.

The CPU constituting the control unit 17a of the external monitor display unit 17 performs the work shown in the flowchart of FIG. 11, and waits for the power button 17a _{2 to} be turned on in the first step S11. . When the power button 17a ₂ is turned on, the process proceeds to step S12,
Then, it is determined whether or not the MR button 17a ₅ has been turned on. If the determination in step S12 is NO, the process proceeds to step S13 to determine whether or not the setting button 17a ₄ has been turned on. When the determination in step S13 is also NO, the process returns to step S11 and the above-described operation is repeated.

Now, the MR button 17a ₅ is turned on,
When the determination in step S12 is YES, step S1
4, the display processing is performed based on the last loaded weight data held and stored in the main controller 13, and the setting button 17
a ₄ is turned on, when the determination in step S13 is YES the process proceeds to step S15, performs a setting process of the control weight.

In the loaded weight display process of step S14, as shown in the flowchart of FIG. 12, a request signal is transmitted to the main controller 13 in the first step S14a, and in the subsequent step S14b the main controller 13 is sent. The last loaded weight data transmitted from the device is received, the loaded weight is displayed on the display unit 17a ₁ by this received data, and the process returns to the original main routine.

In the setting process of step S15, as shown in the flowchart of FIG. 13, the display currently performed on the display unit 17a ₁ is flashed in the first step S15a, and then the process proceeds to step S15b. In step S15b, the reset button 17
It is determined whether or not a ₃ is turned on, and this step S
The favorite judgment of NO 15b determines whether up-down button 17b ₆ proceeds to step S15c is turned on. Setting button 17 ₄ proceeds to step S15d when the determination in step S15c also of NO, it is determined whether the ON operation, the determination in step S15d also returns to the original main routine when the NO.

When the determination in step S15b is YES,
That is, when the reset button 17 ₃ is turned on, the weight display currently displayed is set to 0, and the process proceeds to step S15d. When the determination in step S15c is YES, that is, the up / down button 17
When b ₆ is operated, the step from the value displayed on the display unit 17a ₁ in accordance with the up-down operation proceeds to step S15f is up and down S1
Go to 5d. When the determination in step S15d is YES, that is, when the setting button 15a ₄ is turned on, the process proceeds to step S15g and the current display portion 17a _{1 is} displayed.
The weight value displayed at is transmitted to the load control circuit 16 as the control weight set value, and then the process returns to the main routine.

The load control circuit 16 that has received the weight set value performs the work shown in the flowchart of FIG. 14, and waits for the input of the weight set value from the external monitor display 17 in the first step S21. When the weight set value is input, the process proceeds to step S22, the set value is captured, and then the process proceeds to step S23. In step S23, a request signal is sent to the main controller 13, and then, in step S24, the last loaded weight data transmitted from the main controller 13 is fetched.

Then, in step S25, the set value and the loaded weight data are compared, and it is determined whether or not they match. When the determination in step S25 is NO, that is, when the two do not match, step S26
To output the motor drive signal to the motor drive circuit 20 and then return to step S24. Step S2
When the determination result in step 5 is YES, the process proceeds to step S27, the motor stop signal is output to the motor drive circuit 20, the buzzer on signal for turning on the buzzer 22 is output, and then the process returns to step S21. That is, the ringing control of the motor 19 and the buzzer 22 is performed based on the loaded weight data sequentially read from the main controller 13 and the set value.

In the illustrated embodiment, four load detectors are provided, but for example, even if there are two for the front wheel axle and one for the rear wheel axle, which is common to the left and right, a total of three, it is applied to all axles. The load can be dispersed and detected.

[0038]

As described above, according to the present invention, the loaded weight of the vehicle, which is obtained by detecting the load acting on the axle of each vehicle, is transmitted to the outside of the vehicle through the multiplex communication line routed to the vehicle. Since it is displayed on an external monitor display that is connected to and detached from any of the multiple monitor connection terminals that are installed in a distributed manner, the vehicle loading weight can be monitored at any location outside the cab. Therefore, it is possible to perform the loading and unloading work while monitoring the loaded weight.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of a vehicle weight measuring device according to the present invention.

FIG. 2 is a diagram showing an embodiment of a vehicle load weight measuring apparatus according to the present invention.

FIG. 3 is a diagram showing a specific configuration example of a main controller in FIG.

FIG. 4 is a diagram showing a specific configuration example of a load detector in FIG.

5 is a perspective view showing an external front view of the external monitor display unit in FIG. 2. FIG.

FIG. 6 is a perspective view showing an external rear surface of the external monitor display unit in FIG.

7 is a diagram showing a cross-section of a part of FIG.

FIG. 8 is a diagram showing a method of installing the external monitor display unit of FIGS. 5 to 7 on a vehicle.

FIG. 9 is a diagram showing a specific internal configuration example of the external monitor display unit in FIG.

10 is a flowchart showing work performed by the control unit in FIG.

11 is a flowchart showing work performed by the control unit in FIG.

FIG. 12 is a flowchart showing a specific example of a part of FIG.

13 is a flowchart showing a specific example of another part of FIG.

14 is a flowchart showing work performed by the load control circuit in FIG.

[Explanation of symbols]

11 multiplex communication line 13a ₁ control unit (weight measuring means) 14 _{1 to} 14 ₄ load detector 14d load sensor 15 ₁ to 15 ₃ plural monitor connection terminals 17 external monitor display 17a ₁ display means

Claims (1)

(57) [Claims] 1. A multiplex communication line arranged on a vehicle, a plurality of monitor connection terminals connected to the multiplex communication line and installed outside the vehicle in a distributed manner, and a load acting on each axle of the vehicle. At least three load detectors each having a load sensor for detecting and a communication function and connected to the multiplex communication line, and a load signal connected to the multiplex communication line and corresponding to a load detected by the load detector. Is received from each load detector through the multiplex communication line, and the weight measuring means for measuring the loaded weight of the vehicle based on the received load signal is connected to the monitor connection terminal connected to the multiplex communication line. An externally connected display unit that is detachably connected to receive the loaded weight of the vehicle measured by the weight measurement unit through the multiplex communication line and displays the received loaded weight. Only the vehicle loaded weight measurement device, characterized in that it comprises a monitor display.