JP4530466B2 - Method for measuring the weight of garbage in a garbage truck - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for measuring dust loading weight of a garbage truck.
[0002]
[Prior art]
The garbage collection vehicle is a vehicle that circulates and collects dust discharged from homes and the like and transports it to a dust disposal site or the like. Conventionally, there are various types of garbage collection vehicles equipped with a device for measuring the load weight of dust, for example, in order to obtain management data such as the amount collected in the collection of dust collection vehicles or to prevent overloading of dust. Proposed.
[0003]
For example, Japanese Patent Laid-Open No. 5-72023 discloses that a container containing dust in the rear part of a dust container provided with a loading device for loading dust into the dust container is tilted and dust is thrown into the dust container. It shows a garbage collection vehicle equipped with a tilting device and a weight sensor on the tilting device, and when the container is lifted by the tilting device, the weight of the dust is measured and accumulated, and the total load weight of the dust is calculated. The required technology is shown.
[0004]
Japanese Laid-Open Patent Publication No. 9-170944 discloses a garbage collection vehicle provided with a weighing machine that can be lowered to the ground by an actuator. The technology for obtaining the total load weight by putting in the dust on the weighing scale lowered in the above is shown.
[0005]
[Problems to be solved by the invention]
However, in the case of the former prior art, it is necessary to provide a tilting device for tilting the storage container for each vehicle, and a dedicated storage container is required, so that the equipment cost increases and the storage location of the container is secured. There was a problem.
[0006]
In the latter case, in order to measure the weight of the dust, it is necessary for the worker to get on the weighing scale and perform a stationary operation until the measured value is stabilized, so that a smooth dust collecting work can be obtained. It was difficult.
[0007]
The present invention has been made in view of the above-described points, and the object thereof is to obtain a worker's smooth dust collection work without requiring a dedicated container or tilting device, and during the loading work. It is an object of the present invention to provide a dust loading weight measuring method for a dust collecting vehicle capable of measuring an accurate dust loading weight.
[0010]
[Means for Solving the Problems]
According to the first aspect of the present invention for solving the above-described problem, the method for measuring the weight of a dust collecting vehicle according to the first aspect of the present invention is a scraping operation in which dust loaded from a loading port provided at the rear of the dust collecting box is scraped by a loading panel. And the pushing operation of pushing the dust scraped up by the operation into the dust container by the pushing panel is set as one loading cycle operation, and the loading panel and the pushing panel are operated alternately and continuously. In a method for measuring the load weight of a dust collection vehicle equipped with a loading device for loading dust into a dust storage box, a load sensor for detecting the load weight of the dust and a start and stop operation of the loading device are operated. An operation switch, and samples the detection value of the load sensor from an operation start signal of the operation switch to an operation stop signal at regular intervals. Averaging a group of detected values sampled during dating back a predetermined time from the latest sampling time-point each time grayed seeking measurement, it updates the measurement value as a dust load weight, the 1 loading cycles the predetermined time It is characterized in that it is set to one loading cycle time to be performed .
[0011]
According to the first aspect of the present invention , while detecting the value detected by the load sensor during the operation of the loading device , the loading device performs one loading operation from the latest sampling time point every sampling. Since a group of detected values sampled during the cycle time is averaged to obtain a measured value, and the measured value is updated as the dust loading weight, detection that varies depending on the impact of loading dust, the operation of the loading device, etc. A stable measurement value can be obtained by smoothing the value.
[0012]
Therefore, it is possible to always obtain an accurate dust loading weight during the operation of the loading device, and there is no need to interrupt the loading operation of the worker for the measurement of the dust loading weight or wait until the measurement value becomes stable. Smooth dust collection work can be realized.
[0015]
According to a second aspect of the present invention, there is provided a method for measuring a weight of a dust collecting vehicle in a garbage collection vehicle, in place of an operation switch of the loading device, starting operation of a power take-out device that takes out power from a traveling engine and supplies the power to the loading device. A power take-off operation switch for operating and stopping the operation is used.
[0016]
According to the second aspect of the present invention, the dust loading weight is measured based on a signal from a power take-off operation switch for operating a power take-out device that takes out power from the traveling engine and supplies it to the loading device.
[0017]
The power take-off operation switch is always turned on at the start of loading operation, and is always turned off at the end of loading operation, so the dust loading weight is automatically set without requiring any special operation or work from the operator. Can be measured and the measurement can be automatically stopped while driving.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall view schematically showing a garbage truck. The garbage collection vehicle 1 includes a dust storage box 3 above the body frame 2, and a dust input box 4 for supplying dust is provided at the rear part thereof.
[0019]
The vehicle body frame 2 is provided so as to extend in the longitudinal direction of the vehicle body in a pair, and a load cell 5 which is a so-called mold type strain sensor is provided at a portion corresponding to the front portion and the rear portion of the dust container 3 respectively. Provided (in the present embodiment, four load cells 5 are provided). Each of these load cells 5 detects distortion of the vehicle body frame 2 due to loading of dust.
[0020]
The refuse storage box 3 is made of a metal plate material such as an aluminum plate or an iron plate, and forms a space part in which dust can be accommodated inward. A pair of main frames supported on the body frame is provided.
[0021]
The garbage throwing box 4 is provided with a loading device 6 for loading the dust thrown in from the charging port provided at the rear part into the dust container 3. The loading device 6 includes a loading panel that is rotated by the power extracted from the traveling engine by the power take-out device (PTO) 10 and a pushing panel that pushes the dust scraped up by the loading panel into the dust container 3. Have.
[0022]
When the power take-off operation switch 8 provided in the cab 7 of the garbage truck 1 is turned on, the power take-out device 10 takes out the power of the traveling engine, supplies it to the loading device 6, and is turned off. And stop taking out the power.
[0023]
When the operation switch 9 provided in the vicinity of the charging port of the refuse input box 4 is turned ON, the control unit of the loading device 6 alternates between the loading panel and the pushing panel using the power from the power take-out device 10. The control is performed so that the operation is stopped by an OFF operation. Here, the time for performing one loading cycle operation by the loading panel and the pushing panel (hereinafter referred to as one loading cycle time Ti) is set to 16 seconds.
[0024]
FIG. 2 is a control block diagram of a measuring device that measures the dust loading weight. The four load cells 5 are connected to the load cell amplifier 12 through a low-pass filter (not shown) that cuts high-frequency noise.
[0025]
The load cell amplifier 12 calculates a detection value corresponding to the total load weight of the dust based on the sensor signal input from each load cell 5, and the detection value is input to the load weight measurement ECU 13. A power take-off operation switch 8 is connected to the load weight measurement ECU 13 and an ON / OFF operation signal of the power take-out operation switch 8 is input.
[0026]
The load weight measurement ECU 13 includes a central processing unit CPU, a memory for storing a control program and sampled load weight data, a timer counter for counting an elapsed time T from the ON operation of the power take-off operation switch 8, and the like. In addition, a measurement processing means 16 and an overload determination means 17 are provided inside.
[0027]
The measurement processing means 16 performs a measurement process for smoothing the detection value based on the sensor signal of the load cell 5 to obtain an accurate and stable measurement value, and the overload determination means 17 applies the measurement value obtained by the measurement processing means 16 to the measurement value. Based on the overload judgment.
[0028]
Further, a display 11 (see FIG. 1) provided in the cab 7 is connected to the load weight measurement ECU 13, and the measurement value obtained by the measurement processing means 16 and the overload determination means 17 for overload determination are determined. The result is output. The display unit 11 displays the input measurement value as the garbage loading weight, and displays it when it is overloaded and emits a buzzer sound.
[0029]
Next, a dust loading weight measuring method of the garbage truck 1 will be described below based on the flowcharts of FIGS. 3 and 4.
[0030]
First, before the dust load weight is measured, the detection value of the load cell 5 is initialized as a prerequisite work. Here, the detection value in the empty state in which all the dust in the dust container 3 is discharged is set to the zero point of the loaded weight.
[0031]
FIG. 3 is a flowchart showing a main program executed by the measurement processing means 16. First, in step S1, it is determined whether or not the power take-off operation switch 8 has been turned ON. The power take-off operation switch 8 is always turned ON when starting the dust collecting work, and is always turned OFF when moving the vehicle after the dust collecting work is finished.
[0032]
Accordingly, the dust loading weight measurement process is started by turning ON the power take-off operation switch 8 and is ended by the OFF operation, so that the operator can automatically perform the dust loading weight without requiring any operation for the measurement processing. Can be reliably measured, and forgetting to measure can be prevented.
[0033]
When the power take-off operation switch 8 is turned on (Yes in step S1), the process proceeds to step S2 to start the measurement process of the dust load weight. In step S2, the sampled accumulated weight data for obtaining the average value stored in the memory of the load weight measurement ECU 13 is reset, and the load weight data stored in the memory in the previous dust loading operation. Are all destroyed.
[0034]
At this time, the detection value in the empty state where all the dust in the dust storage box 3 set to the zero point of the loaded weight is measured before the dust loaded weight is measured and OFF before the power take-off operation switch 8 is turned on. The measured value that was held and displayed in the state of is not discarded but is retained.
[0035]
In step S3, a time lag of 5 seconds is taken and control is performed so that vibration during traveling does not affect the measurement, and during that time, the power take-off operation switch 8 is held in the OFF state before the ON operation is performed. The displayed measurement value is continuously displayed, and the loading weight data for obtaining the average value is not sampled.
[0036]
In step S4, a measurement process is performed to smooth the detection value that fluctuates due to vibration or impact of throwing in the dust or the detection value that fluctuates in conjunction with the loading operation of the loading device 6 to obtain an accurate and stable measurement value. This is repeated until the power take-off operation switch 8 is turned off next time, and the displayed measurement value is updated.
[0037]
On the other hand, when the power take-off operation switch 8 is turned off, the routine is immediately exited, but the data immediately before being turned off is retained and displayed. Accordingly, when the operator finishes the loading operation of dust and returns to the operator's cab 7 and turns off the power take-off operation switch 8 to move the garbage collection vehicle 1 to the next dust collection station, the loading of the dust is performed. The weight measurement is terminated, and the loaded weight is not measured while the garbage truck is moving.
[0038]
FIG. 4 is a flowchart showing the dust loading weight measurement process in step S4, which is executed in a predetermined program cycle, and is set to be executed at intervals of 1 second in the present embodiment.
[0039]
First, in step S5, it is determined whether or not the power take-off operation switch 8 is in the ON state. If it is in the ON state (Yes), the process proceeds to step S6, and if it is in the OFF state (NO), this routine is executed. Exit the measurement process.
[0040]
In step S6, the detection value of the load cell amplifier 12 based on the sensor signal of the load cell 5 is sampled and stored in the memory as loading weight data at the time of execution of this routine. In step S7, it is determined whether or not the elapsed time T from the ON operation of the power take-off operation switch 8 measured by the timer counter has exceeded one loading cycle time Ti.
[0041]
Here, from the time when the elapsed time T 1 when a loading cycle time Ti or (T ≧ Ti) (Yes), the process proceeds to step S8, and sampled the latest load weight data W _n in step S6, step S8 The average value Wm of a group of load weight data sampled and stored in the memory during one loading cycle time Ti is obtained by the following equation (1).
[0042]
Wm = (W _n + W _n−1 + W _n−2 +... + W _nm ) / m (1)
Wm: Average value of a group of loading weight data (measured value)
W _n : Latest load weight data sampled by the current routine execution W _n-1 : Load weight data sampled by the previous routine execution W _n-2 : Load weight data sampled by the previous routine execution W _nm : Loading weight data sampled m times before execution of routine m: Number of loading weight data W sampled during one loading cycle time Ti from the time when the latest loading weight data was sampled (1) According to the equation, the loading weight data (W _n , W _n sampled and stored in the memory during one loading cycle time Ti, for example, 16 seconds from the time when the latest loading weight data W _n was sampled in step S6. ₋₁ , W _n−2 ,..., W _nm ), the average value Wm is obtained.
[0043]
In the present embodiment, since the program cycle of this routine is 1 second and the 1 loading cycle time Ti of the loading device 6 is 16 seconds, 16 pieces of loading weight data W are used.
[0044]
Each time the loading weight data W is sampled, a new group of new loading weight data W is added and the oldest loading weight data W is excluded within one loading cycle time Ti from the latest sampling time point. An average value Wm is calculated based on the loaded weight data, and the average value Wm is used as a measurement value.
[0045]
Therefore, for example, a detection value that varies due to vibration or an impact caused by throwing in dust or a detection value that varies in conjunction with the loading operation of the loading device 6 can be smoothed to obtain an accurate and stable measurement value. Then, this routine is repeated until the power take-off operation switch 8 is turned off.
[0046]
If the elapsed time T is less than the predetermined time Ti (T <Ti) in step S7 (NO), the process proceeds to step S9. In step S9, processing is performed while the number of sampling data is small immediately after the power take-off operation switch 8 is turned on.
[0047]
After the end of the 5-second time lag, the number of sampled load weight data for averaging for a further 5 seconds is as small as 5 or less, so it was retained when the power take-off operation switch 8 was in the OFF state before the ON operation was performed. The measurement value is left and displayed, and only the loading weight data is sampled.
[0048]
The average of the newly sampled load weight data after the power take-off operation switch 8 is turned on for the first time when five or more pieces of the load weight data are sampled is obtained as a measured value. As a result, a more accurate measurement value can be obtained during the period until the elapsed time T passes the predetermined time Ti.
[0049]
The measurement value obtained by the above measurement process is output to the display 11 and the overload determination means 17 and is displayed as the dust load weight and it is determined whether the load is overloaded. Accordingly, the display 11 always displays an accurate and stable dust loading weight and is updated each time sampling is performed. In the case of overloading, alarm means (not shown) is activated.
[0050]
When the dust collection operation at the current station is completed and the power take-off operation switch 8 is turned off (NO in step S1 in FIG. 3), and the measurement of the dust load weight is finished, the display on the display 11 is turned off. The load weight is fixed at the immediately preceding load weight, and the load weight is displayed until the power take-off operation switch 8 is turned ON and measurement is started. Therefore, the operator can recognize the dust loading weight during and after the dust loading operation. The indicator 11 is preferably one that keeps displaying when the engine key switch is ON.
[0051]
In addition, since the overload determination unit 17 can sequentially obtain accurate and stable measurement values from the above-described measurement processing unit 16 during the dust loading operation, the overload determination can be performed quickly and accurately. Loading can be prevented in advance.
[0052]
In addition, this invention is not limited to the above-mentioned embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, the above measurement process may be started and ended based on the ON / OFF operation of the operation operation switch 9 of the loading device 6 instead of the power take-off operation switch 8.
[0053]
【The invention's effect】
As described above, according to the method for measuring the load weight of a dust collection vehicle according to the present invention, the measurement of the load weight of the dust by the load sensor is started by the operation start signal of the operation switch, and is measured by the operation stop signal of the operation switch. Therefore, the dust loading weight can be automatically measured without requiring any special operation or work from the operator, and the measurement can be automatically interrupted during traveling. Therefore, it is possible to reliably measure the dust loading weight without interrupting the operator's dust loading operation to measure the dust loading weight or forgetting to measure.
[0054]
In addition, according to another invention, it is possible to obtain a stable measurement value by smoothing a detection value that fluctuates according to vibration or impact caused by throwing in dust or a detection value that fluctuates according to the operation of the loading device. Therefore, it is possible to always obtain an accurate dust loading weight during the operation of the loading device, and there is no need to interrupt the loading operation of the worker for the measurement of the dust loading weight or wait until the measurement value becomes stable. A quick dust loading operation can be realized, and an accurate overload determination can be made.
[Brief description of the drawings]
FIG. 1 is an overall view schematically showing a garbage truck to which the present invention is applied.
FIG. 2 is a control block diagram.
FIG. 3 is a flowchart showing a main program for measuring the load weight of the garbage.
FIG. 4 is a flowchart showing a dust loading weight measurement process.
[Explanation of symbols]
1 Dust collection vehicle 3 Dust storage box 4 Dust input box 5 Load cell (load sensor)
6 Loading device 8 Power take-off operation switch 9 Actuation operation switch (operation switch)
DESCRIPTION OF SYMBOLS 10 Power take-out apparatus 11 Display 16 Measurement processing means

Claims (2)

A scraping operation for scraping up the dust thrown in from the inlet provided at the rear of the dust throwing box with the loading panel, and a pushing operation for pushing the dust scraped up by the operation into the dust containing box with the pushing panel. In a method for measuring a weight of a dust collecting vehicle having a loading device for loading dust into a dust storage box by continuously operating the loading panel and the pushing panel alternately in one loading cycle . ,
A load sensor for detecting the load weight of the dust,
An operation switch for operating start and stop of the loading device;
The detection values of the load sensor are sampled at regular time intervals from the operation start signal to the operation stop signal of the operation switch, and a group of detection values sampled for a predetermined time from the latest sampling time each time is sampled. Then, the measurement value is obtained, the measurement value is updated as the dust loading weight, and the predetermined time is set as one loading cycle time for performing the one loading cycle. Method. Instead of the operation switch of the loading device, a power take-off operation switch for operating start and stop of the power take-out device that takes out power from the traveling engine and supplies it to the load device is used. The method for measuring a weight of a dust collection vehicle according to claim 1 .

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