JPH06186075A - Vehicle weight measuring device - Google Patents

Abstract

PURPOSE:To provide a vehicle weight measuring device which is excellent in maintenance properties and serviceability, does not require any special sensor for detecting the retreat of each vehicle, does not require change in setting of the number of axles for each vehicle for measurement, and can singly deal with variations in the number of axles of each vehicle for measurement. CONSTITUTION:When a vehicle 9 travels in a certain proper speed range a setting storage means 3 presets and stores a setting time T0 longer than the time required for each axle or wheel to pass a vehicle weight measuring device. A time detection means 2 detects the time of passage of each axle or wheel from the time of output of each weight detection signal, and a comparison and discrimination means 4 compares the output time intervals T1, T2, T3 and the maximum setting time T01, T02, T03 of the weight detection signals, the output time intervals corresponding to the time of passage of the portion between each axle which is calculated from predetermined signals outputted from the time detection means 2. When the former T1, T2, T3 are greater than the latter T01, T02, T03, the means 4 determines that the vehicle has retreated and an addition means 5 detects the overall weight of the vehicle by adding the weight detection signals together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle weight measuring apparatus for detecting a gross weight of a vehicle while it is passing, and more particularly to a vehicle weight measuring apparatus capable of automatically measuring the weight of a vehicle having various numbers of axles. It is a thing.

[0002]

2. Description of the Related Art Various vehicle weight measuring devices have been proposed and developed which are capable of speedily measuring the weight of a vehicle such as a large truck or a dump truck traveling on the road without stopping. In this vehicle weight measuring device, for example, a weight (axle weight) is detected for each axis, a total vehicle weight is measured by adding all the detected axle loads, and a weight is detected for each wheel. It is known to add up these to measure the total weight of the vehicle.

By the way, in such a vehicle weight measuring device,
A means for detecting that the vehicle to be measured has passed has been required.Therefore, for example, an exit sensor consisting of a photoelectric tube that optically detects the presence or absence of the vehicle and a pressure switch that physically detects the vehicle should be installed. It is known that the number of axes of a measuring vehicle is initialized at the time of installation or installation of equipment, the number of axes is counted at the same time as the axis load, and the exit of the vehicle is detected when the number of axes matches the set number of axes. ing.

[0004]

If the former exit sensor is used as a means for detecting that the vehicle has finished passing, it can be surely detected even if the number of axes is different for each vehicle. Although there is no problem with this, when configuring the vehicle weight measuring device as a system, the number of maintenance sensors and transportation is increased due to the provision of the exit sensor, which is inferior in convenience and manufacturing cost is increased.

Further, in the latter method of initializing the number of axes of the vehicle, the vehicle to be measured is limited to that number of axes.
It is necessary to prepare the same number of devices as the number of types of set axes. In addition, when changing the number of axes of the vehicle to be measured, it is necessary to take measures such as changing the setting of the number of axes each time by an inspector, and in terms of installation space, cost, operability, etc. There's a problem.

In view of the above-mentioned drawbacks, the present invention eliminates the need for a special sensor for detecting the exit of each vehicle, and the axis to be detected according to the number of axes of each vehicle to be measured. It is not necessary to change the number each time, in other words, even if the number of axles of the vehicle to be measured is various, it is possible to handle with one unit, and this makes it possible to maintain the vehicle weight easily and easily. It is intended to provide.

[0007]

That is, the present invention is a vehicle weight measuring device for detecting the weight of a vehicle passing at a predetermined speed, and a weight detecting means for detecting the weight of each wheel of a passing vehicle, For a plurality of weight detection signals output from the weight detection means corresponding to each wheel, time detection means for sequentially detecting the elapsed time between these weight detection signals, and the maximum value of each elapsed time between the detection signals The setting storage means for setting and storing the desired time in advance, the elapsed time detected by the time detecting means and the setting storage time set by the setting storage means corresponding to the elapsed time are compared and the setting is performed. A comparison and determination unit that determines that the vehicle has completed passing when the elapsed time exceeds the storage time, and weights from the weight detection unit when the comparison and determination unit determines that the vehicle has completed passing. It is made of an adding means for adding the detection signals.

[0008]

In the present invention, the passage time of each axle is detected by the time detection means from the output time of the weight detection signal, and is equivalent to the passage time of each inter-axle portion calculated from the predetermined signal output from this time detection means. The comparison / discrimination means compares the output time interval of the weight detection signal with the set time. If the former is larger than the latter, it is determined that the vehicle has exited, the weight detection signal values up to that point are summed up, and the total vehicle weight is detected by the addition means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a vehicle weight measuring apparatus according to the present invention. The vehicle weight measuring apparatus includes a weight detecting means 1, a time detecting means 2, a setting storing means 3, a comparison determining means 4, and an adding means. 5 and display means 6.

The weight detecting means 1 detects the weight of each wheel of a passing vehicle, and outputs a weight detection signal to the adding means 6 and the time detecting means 2 according to the detected weight. As shown in FIG. 2, a pair of loading plates 11 on which the left and right wheels 7 directly pass therethrough, and the loading plates 1
1 and a strain gauge 12A to 12D attached to a beam 16 that supports the loading plate 11. The outputs from the strain gauges 12A to 12D are summed by the summing device 15 shown in FIG. 2 and then, as shown in FIG.
The output signal is amplified by the amplifier 13. The output of the amplifier 13 is the A / D converter 14
Is connected to the input of and the amplified analog signal is
The digital signal is converted by the / D converter 14.

The time detecting means 2 successively inputs the respective weight detection signals output from the weight detecting means 1 as the wheels 7 (axles 8) pass, and compares the time signals corresponding to the respective input times. It outputs to the discrimination means 4,
The input is connected to the output of the weight detection means 1, and
The output is connected to the input of the comparison / discrimination means 4.

The setting storage means 3 has a time equal to or longer than the maximum length of the inter-axle lengths of the vehicles of all vehicle types to be measured, which is one of the data used to determine the completion of passage of each vehicle (hereinafter referred to as the following). Is called a set time) and is stored in advance. This set time (T ₀ ) is
The vehicle speed V at the time of measuring the vehicle weight is in a proper constant range (V ₁ <V <
V ₂ ) is required to be determined and calculated, that is, the set time T ₀ ,
That is, the output time interval T ₀ of the weight detection signal that is allowed because the vehicle is not considered to have passed is determined from, for example, the following equation T ₀ ≧ L / V ₁ (V ₁ : the minimum value of the appropriate speed). Has become. The output of the setting storage means 3 is connected to the input of the comparison / determination means 4, but the set time can be easily changed by a setting button or the like not shown.

Upon receiving each time signal output from the time detecting means 2, the comparing / determining means 4 immediately calculates the input time interval ΔT of each time signal, and the input time interval ΔT.
And the set time T ₀ stored in the setting storage means 3 are compared. Then, this comparison and determination means 4
Determines that the input time interval ΔT exceeds the set time T ₀ , the final axle of the vehicle is the mounting plate 11 of the vehicle weight measuring device.
It is determined that the vehicle has completely passed through, that is, it is detected that the vehicle for measuring the vehicle weight has exited. When the exiting operation is detected, the comparison / determination means 4 immediately outputs a stop signal for stopping the summing operation to the adding means 5, so that the output is connected to the input of the adding means 5.

The adding means 5 sequentially inputs and stores the respective weight detection signal values output from the weight detecting means 1, and when the comparing and determining means 4 determines that the vehicle has completed passing, stores until then. The total weight detection signal values are summed up and the gross vehicle weight is detected from the summed value.
As shown in FIG. 3, the adding means 5 of this embodiment stores a CPU 51 whose input is connected to the output of the A / D converter 14 of the weight detecting means 1 and a weight detecting signal value which is connected to the CPU 51. And a memory 52 to be stored.
In this embodiment, the weight detecting means 1, the time detecting means 2, the setting storing means 3 and the comparing and judging means 4 which are composed of electronic components are packaged together with the adding means 5 in one unit. In case of trouble, it can be easily replaced.

The display means 6 is adapted to display the total vehicle weight obtained by the addition by the adding means 5 on the screen, and a CRT, a liquid crystal display (LCD) or the like is used.

According to the present invention, generally, the time required to pass the maximum inter-axle portion of the inter-axle distances is generally the front axle of the next measurement vehicle after the last axle of the measurement vehicle exits. Paying attention to the fact that it is shorter than the time it takes to enter, when the vehicle travels within a certain appropriate speed range for each set time of the setting storage means, the vehicle weight measuring device is the part where the axle distance is the maximum length. It is also possible to configure so that a value slightly larger than the time required to pass through is set and stored in advance as the set time.

Next, the operation of this embodiment will be described with reference to the waveform chart of FIG. 4 and the flowchart of FIG.

Here, FIG. 4 has three axes and is output from the weight detecting means 1 when a truck 9 carrying a load passes through the weight measuring apparatus according to this embodiment within an appropriate speed range. FIG. 6 is a waveform diagram of each weight detection signal input to the adding means 5, and the weight measurement in the case of the truck 9 will be described. Further, it is assumed here that the set maximum time between the axes is set as T ₀₁ , T ₀₂ , and T _{03 in} FIG.

Further, in FIG. 4, when the total weight W of the truck 9 is detected, the weight detecting means 1 detects a weight detection signal I at the time of passing through each axis, and the adding means 5 to which this signal I is inputted is predetermined. Waveform processing is performed to obtain the required signal value I. And the following equation

[0020]

[Equation 1]

The weighting corresponding to the summed signal value is detected by the above.

(I) First, the power of the weight measuring device is turned on (first step S1). (II) By this, the data at the time of the previous measurement, which is reset and stored in the adding means 5, is erased (second step S2). (III) Next, when the truck 9 enters, the weight detection means 1
The strain gauges 12A to 12D output signals according to weight as the first shaft passes. Then, the adding means 5 and the time detecting means 2 to which the signal value is input start operating when the input signal value exceeds the trigger level I ₀ from the lower side (third step S3).

(IV) As a result, the adding means 5 stores the input signal waveform and performs the required arithmetic processing according to the waveform (fourth step S4). That is, in this embodiment, as shown in FIG. 4, the signal values I ₁ , I ₂ , and I ₃ at intermediate times when the signal waveform reaches the horizontal level are stored as data corresponding to each weight. Also, the time detection means 2
Sequentially detects times t ₁ , t ₁ ′, t ₂ , t ₂ ′ ... When the waveform level drops below the trigger level I _0, and outputs a time signal corresponding to this time to the comparison / discrimination means 4. .

(V) Further, the adding means 5 terminates its operation when the trigger level I ₀ is reached from the higher side (fifth step S5). (VI) As a result, the weight waveform measurement for each axis ends (sixth step S6). (VII) Further, at this time, the weight is detected and stored by the adding means 5 according to the signal waveform inputted for each wheel (seventh step S7).

(VIII) The same operation is repeated thereafter, that is, the second step S2 to the seventh step S7 are repeated. Then, when this repeated operation reaches the sixth time, that is, it is determined whether or not the measurement up to the sixth axis has been performed (eighth time).
Step S8). Then, just at the time of measuring the sixth axis, the maximum number of axes of the vehicle is set to six in advance, and the process immediately proceeds to the eleventh step S11. Further, in the case of a three-axis vehicle or the like as in this embodiment, the following ninth
Control goes to step S9.

(IX) Since the truck 9 has three axes, the measurement work is ended when the weights of the three axes are detected, and the vehicle weight is detected by adding these, but the measurement work is ended. The operation is detected from the time signal output from the time detecting means 2 as follows. That is, first, in the third step S3, the time t ₁ when the trigger level I ₀ is reached from the signal value input to the time detecting means 2,
t ₁ ′, t ₂ , t ₂ ′, etc. are sequentially detected, and a time signal corresponding to this time is output to the comparison / discrimination means 4. Then, the comparison / discrimination means 4 which receives the time signal detects each of the input time intervals T ₁ , T ₂ and T ₃ (the ninth step S9).

(X) Next, the detected input time intervals T ₁ , T ₂ , T ₃ are compared with the set times T ₀₁ , T ₀₂ , T ₀₃ stored in the setting storage means 3. Then, when the time T _k larger than each set time is detected, the track 9
The exit operation is detected and a stop signal is output to the adding means 5 (tenth step S10). This tenth step S10
Is the time limit from when the weight signal for each wheel reaches from the higher trigger level to when the next weight signal reaches from the lower trigger level. Also, if the next signal is not input, the measurement ends.

(XI) As a result, the adding means 5 to which the stop signal is input sums up the weight detection signals I input so far, detects the vehicle weight corresponding to the summed signal value, and displays the means. The vehicle weight is displayed on 6 (11th step S1)
1).

In this embodiment, the first and second parts shown in FIG.
The three-axle truck whose axial length is longer than the second and third axial lengths has been described. For example, the vehicle to be measured is a two-axle 9'and a three-axle 9 "of the type shown in FIGS. If there is 1
The distance between axes is wide between axes 2 and 3 is narrow (2
(Of course, there is only one shaft between the first and second shafts.) Therefore, if the intervals T ₀₁ ′ and T ₀₁ ″ between the input shafts are set to be long and T ₀₂ ″ is set to be short, malfunctions can be prevented, and in practice The time lag between the end of measurement and the end of measurement on the device side can be reduced.

That is, the set time T ₀₁ ′ between the first axis and the second axis is a value larger than Z ₁ ′ and Z ₁ ″.
It should be set to a value larger than Further, the set time T ₀₂ ′ between the second axis and the third axis may be set to a value larger than Z ₁ ″.

Here, Z ₁ ′ is the maximum time required to pass the axle distance between the first and second axles at a speed within the proper speed range in the vehicle of FIG. 6, and Z ₁ ″ is also the same. Figure 7
Maximum required for to pass through the first shaft and the second axis of the axle spacing length at a speed within a proper speed range of the vehicle time, Z ₂ "
Is the maximum time required to pass the distance between the second and third axes of the vehicle in FIG. 7 at a speed within the proper speed range.

According to this, for example, when the vehicle of FIG. 6 passes over the mounting plate 11 of the vehicle weight measuring apparatus 1, if the first axis passes, the second axis is passed before the set time T ₀₁ ′ has elapsed. The weight signal of is detected, it is detected that the passage is not completed yet,
Further, when the second axis passes, the weight signal is not detected even when the set time T ₀₂ ′ has passed, and thus it is detected that the vehicle of FIG. 6 has passed over the mounting plate 11.

Further, when the vehicle of FIG. 7 passes over the mounting plate 11 of the vehicle weight measuring device 1, if the first axis passes, the weight signal of the second axis is sent before the set time T ₀₁ ′ has elapsed. It is detected that the passage has not been completed yet, and when the second axis passes, the weight signal of the third axis is detected before the set time T ₀₂ ′ has passed, and the passage has not been completed yet. Is detected.

Furthermore, when the third axis passes, the weight signal is not detected even after the set time T ₀₃ ′ has passed, and therefore it is detected that the vehicle of FIG. 7 has passed over the mounting plate 11.

In the vehicle of FIG. 7, if the distance between the first axis and the second axis is about 5 m and the distance between the second axis and the third axis is about 1.5 m, the passing speed is about 2 to 5 km / h. Since T ₀₁ ″ and T ₀₂ ″ are 10 seconds and 4
It is better to set it to seconds. 3 because T ₀₃ ″ is not a 4-axle
The set time after passing the axis and 2 seconds can be shortened to 2 seconds.

As described above, if the interval between the input shafts is set in accordance with the type of vehicle to be measured, the vehicle weight can be measured reliably and promptly. If the device is set to the measurement standby state when the measurement is completed, the next measurement can be quickly performed. Further, although the weight is measured for each wheel in this embodiment, the present invention is not limited to this, and the gross vehicle weight may be measured from the measurement of the axle load.

[0037]

As described above, according to the present invention, the time detecting means detects the passing time of each axle from the output time of the weight detecting signal, and the predetermined signal output from the time detecting means. Since the comparison and determination means compares the output time interval of the weight detection signal corresponding to the calculated passing time between the axles with the set time, for example, when the former is larger than the latter, the vehicle exits. It can be automatically determined that the weight detection signal values up to that time have been added up and the total vehicle weight can be detected by the addition means. The vehicle weight can be accurately detected, which in turn makes it possible to provide a system weight measuring device that is easy and simple to maintain.

[Brief description of drawings]

FIG. 1 is a block diagram showing a weight measuring device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a specific configuration and the like of weight detection means of the same apparatus.

FIG. 3 is a block diagram showing a main configuration of the device.

FIG. 4 is a signal waveform diagram during weight measurement of a triaxial truck.

FIG. 5 is a flowchart showing the operation of the apparatus.

FIG. 6 is an explanatory view showing a shaft mounting state of another measurement vehicle.

FIG. 7 is an explanatory view showing a shaft mounting state of still another measurement vehicle.

[Explanation of symbols]

1 weight detecting means 2 hours detector 3 setting storage unit 4 comparing discriminating means 5 addition means 6 display unit 7 wheels 9, 9 ', 9 "vehicle T _1, T _2, T ₃ input time interval T _01, T _02, T ₀₃ Set maximum time

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyuki Kobayashi 3-5-5-527 Ogawa Higashi-cho, Kodaira-shi, Tokyo (72) Inventor Yasushi Takahashi 952-3 Kamekubo, Iruma-gun, Saitama Prefecture (72) Invention Researcher Haruki Kawada 165-9 Higashifukai, Nagareyama City, Chiba Prefecture

Claims (1)

[Claims] 1. A vehicle weight measuring device for detecting the weight of a vehicle passing at a predetermined speed, the weight detecting means for detecting the weight of each wheel of a passing vehicle, and the weight detection device corresponding to each wheel. Time detection means for sequentially detecting the elapsed time between these weight detection signals with respect to the plurality of weight detection signals output from the means, and the maximum value of each elapsed time between the detection signals is set in advance to a desired time and stored. The setting storage means is compared with the elapsed time detected by the time detection means and the setting storage time set by the setting storage means corresponding to this elapsed time, and when the set storage time exceeds the elapsed time, A comparison determination means for determining that the vehicle has completed passing, and an addition means for adding each weight detection signal from the weight detection means when the comparison determination means determines that the vehicle has completed passing. Car becomes a weight measurement device.