JP7239947B2 - garbage truck - Google Patents

Description

The present invention relates to a garbage truck equipped with a loading device for loading garbage into a garbage storage box and a discharge device for discharging the garbage loaded in the garbage storage box to the outside.

Conventionally, a garbage storage box for storing garbage, a garbage input box having an input port for inputting garbage from the outside, a loading device for loading the trash input into the garbage input box into the garbage storage box, and garbage storage There is a garbage truck equipped with a discharge device for discharging the garbage loaded in the box to the outside. In this garbage collection vehicle, based on the pressing pressure (maximum pressure value) of the garbage when pushing the garbage into the garbage storage box by the pushing plate of the loading device, the load amount (weight) of the garbage to the garbage storage box A system that calculates an approximate value is known (see Patent Document 1, for example).

In addition, in this garbage collection vehicle, there is a type equipped with a discharge device that discharges the garbage loaded in the garbage storage box to the outside by moving the discharge plate to the rear of the vehicle (discharge plate type garbage collection vehicle). . In this type of garbage collection vehicle, with the discharge plate positioned at the rear of the vehicle, the loading of garbage by the loading device is started, and as the amount of garbage loaded into the garbage storage box increases, gradually Many of them have a discharge plate operation function, which is a function of expanding the garbage storage space in the garbage storage box by moving the discharge plate to the front of the vehicle. By using this discharge plate operation function, it is possible to load the waste into the waste storage box while compressing the waste between the pushing plate and the discharge plate of the loading device.

JP-A-4-75901

If the specific gravity of the garbage to be collected falls within the category of general garbage (garbage) (the specific gravity of the average garbage is not significantly different from that of the average garbage), When the discharge plate operation function is used and when it is not used, the pressing pressure of the trash when pushed by the loading device (the push plate of the loading device) and the weight of the trash already loaded in the trash box (loading quantity) are different. For this reason, like the conventional garbage truck described in Patent Document 1, without considering whether or not the discharge plate operation function is used, the pressing pressure (maximum pressure value) of the garbage when pushed by the loading device Based on the method of calculating the approximate weight of the garbage loaded into the garbage storage box, if the specific gravity of the garbage to be collected does not differ greatly from the average garbage specific gravity, the garbage that has been loaded into the garbage storage box weight cannot be calculated accurately.

The present invention solves the above-mentioned problems, and is a garbage collection vehicle of a type having a discharge plate operation function. Intended to provide a car.

In order to solve the above problems, the garbage collection vehicle of the present invention includes a garbage storage box for storing garbage, a garbage input box having an input port for inputting garbage from the outside, and a garbage input box. A loading device for loading garbage into the garbage storage box, and a discharge device having a discharge plate and discharging the garbage loaded in the garbage storage box to the outside by moving the discharge plate to the rear of the vehicle. , with the discharge plate positioned at the rear of the vehicle, the loading of garbage by the loading device is started, and as the amount of garbage loaded into the garbage storage box increases, the discharge plate is gradually lifted. In a garbage collection vehicle having a discharge plate operation function that is a function of expanding the garbage storage space in the garbage storage box by moving it forward of the vehicle, an approximate value of the weight of the garbage that has been loaded into the garbage storage box is calculated. Weight calculation means is further provided, and the weight calculation means switches the approximation formula used for calculating the approximate value of the weight of the garbage according to whether or not the discharge plate operation function is used.

In this garbage truck, when the discharge plate operation function is used, the weight calculation means calculates the approximate expression used for calculating the approximate value of the weight of the garbage as the number of times the garbage is loaded by the loading device. It is desirable to switch to an approximation formula of exponential approximation in which is a variable.

According to the garbage collection vehicle of the present invention, depending on whether or not the discharge plate operation function is used, or whether the specific gravity of the garbage to be collected differs from the average specific gravity of the garbage by a predetermined threshold or more, the amount of loaded garbage The approximation formula used to calculate the weight approximation is switched. Depending on whether or not the discharge plate operation function is used, when switching the approximation formula used for calculating the approximate value of the weight of the loaded garbage, unlike the conventional garbage truck described in Patent Document 1, It is possible to calculate an approximation of the weight of the garbage loaded into the garbage storage box by considering whether or not the discharge plate operation function is used. can. In addition, if the approximate expression used for calculating the approximate value of the weight of the loaded garbage is switched depending on whether the specific gravity of the garbage to be collected differs from the average garbage by a predetermined threshold or more, Unlike the conventional garbage collection vehicle described in Patent Document 1, when the specific gravity of the garbage to be collected is close to the specific gravity of the average garbage, and when the specific gravity of the average garbage is significantly different (Garbage to be collected (garbage) is garbage such as used diapers, Styrofoam, cardboard, etc.), so the approximate value of the weight of the garbage that has been loaded into the garbage storage box can be accurately calculated. can do.

BRIEF DESCRIPTION OF THE DRAWINGS Side sectional drawing which looked at the refuse collection vehicle of one Embodiment of this invention from the port side. A plan view of the same garbage truck. Rear view of the same garbage truck. The rear side side view of the locked state of the garbage truck. The rear side side view of the garbage collection vehicle in the unlocked state. Hydraulic circuit diagram of the garbage truck. Front view of the switch box of the garbage truck An electrical block configuration diagram around the PLC of the garbage truck. The flowchart of the weight calculation process of the garbage truck. FIG. 10 is a flowchart of approximate expression set processing in FIG. 9 ; FIG. FIG. 10 is a diagram showing analysis results of the correlation between the number of times of loading and the weight and the correlation between the average pressure and the weight for all data and corrected data of car No. 36; A graph showing the analysis result of the correlation (linear approximation) between the number of loading times and the weight for all data of car No. 36. A graph showing the analysis result of the correlation (linear approximation) between the number of times of loading and the weight for the correction data of the No. 36 car. Graph showing analysis results of average pressure and weight correlation (exponential approximation) for all data of car No. 36. FIG. A graph showing the analysis results of the average pressure-weight correlation (exponential approximation) for the corrected data of the No. 36 car. FIG. 10 is a diagram showing analysis results of the correlation between the number of times of loading and the weight and the correlation between the average pressure and the weight when the ejection plate operation function is used and when the ejection plate operation function is not used, for the corrected data of car No. 36; (a) is a graph showing the analysis results of the correlation (linear approximation) between the number of loading times and the weight for the correction data of car No. 36; A graph showing the results of analysis by dividing the data for the case of "with discharge plate" and the data for "without ejection plate". (a) is a graph showing the analysis results of the correlation (exponential approximation) between the number of loading times and the weight for the correction data of car No. 36; A graph showing the results of analysis by dividing the data for the case of "with discharge plate" and the data for "without ejection plate". (a) is a graph showing the analysis results of the correlation (linear approximation) between the average pressure and weight for the corrected data of car No. 36; ” data and data for “no ejection plate”. (a) is a graph showing the analysis results of the correlation (exponential approximation) between the average pressure and weight for the corrected data of car No. 36; ” data and data for “no ejection plate”. FIG. 10 is a diagram showing analysis results of the correlation between the number of times of loading and the weight and the correlation between the average pressure and the weight when the ejection plate operation function is used and when the ejection plate operation function is not used, for the correction data of the 46th car; (a) is a graph showing the analysis results of the correlation (linear approximation) between the number of loading times and the weight for the correction data of car No. 46; A graph showing the results of analysis by dividing the data for the case of "with discharge plate" and the data for "without ejection plate". (a) is a graph showing the analysis results of the correlation (exponential approximation) between the number of loading times and the weight for the correction data of car No. 46; A graph showing the results of analysis by dividing the data for the case of "with discharge plate" and the data for "without ejection plate". (a) is a graph showing the analysis results of the correlation (linear approximation) between the average pressure and weight for the corrected data of car No. 46; ” data and data for “no ejection plate”. (a) is a graph showing the analysis results of the correlation (exponential approximation) between the average pressure and weight for the corrected data of car No. 46; ” data and data for “no ejection plate”.

BEST MODE FOR CARRYING OUT THE INVENTION A garbage truck according to an embodiment embodying the present invention will be described below with reference to the drawings. First, with reference to Drawing 1 and Drawing 2, the schematic structure of the garbage truck by this embodiment is explained. FIG. 1 is a side cross-sectional view of the garbage truck according to the present embodiment as seen from the port side. As shown in FIG. 1, the garbage collection vehicle 1 includes a driver's cab (cab) C, a pair of left and right vehicle body frames F formed extending rearward from the lower part of the driver's cab C, and a garbage storage box for storing garbage. 2 and a garbage throwing box 3 arranged behind the garbage storage box 2.例文帳に追加The trash throwing box 3 has a throwing port 3a into which trash is thrown from the outside. A loading device 4 is provided in the garbage throwing box 3 for loading the garbage thrown into the garbage throwing box 3 into the garbage storage box 2. is provided. The discharge device 5 has a discharge plate 9, and by moving the discharge plate 9 to the rear of the vehicle, the garbage loaded in the garbage storage box 2 is discharged to the outside.

FIG. 2 is a plan view of the garbage truck 1. FIG. As shown in FIG. 2, the body frame F has a pair of left and right vertical frames F1 extending in the vehicle front-rear direction and a plurality of horizontal frames F2 extending in the vehicle width direction. The vertical frame F1 is formed of a channel member that opens inward in the vehicle width direction. The horizontal frame F2 reinforces the left and right vertical frames F1. Both ends of the horizontal frame F2 are fixed to each vertical frame F1 by, for example, rivets (not shown) while being arranged between the left and right vertical frames F1.

Next, with reference to FIG. 1, the configuration of the garbage storage box 2 will be described. As shown in FIG. 1, a garbage storage box 2 is mounted on the body frame F of the garbage collection vehicle 1, and the bottom wall 2a of the garbage storage box 2 is a gently sloping surface that descends backward. . The rear surface of the garbage storage box 2 is inclined rearward from the upper part to the lower part, and a rear end opening (not shown) is opened over the entire surface, and a reinforcing member is provided around the rear end opening. The edge is reinforced by 2b (see FIG. 5), and this reinforcing member 2b extends downward from the bottom wall of the garbage container 2. As shown in FIG.

Next, the configuration of the discharging device 5 will be described. As shown in FIG. 1, in the garbage storage box 2, a discharge plate (discharge plate) 9 that can advance and retreat with respect to the garbage throwing box 3 at the loading position is disposed. A storage space 2c for storing dust is formed (between the discharge plate 9 and the rear end opening in the dust storage box 2). The discharge plate 9 is composed of a discharge plate main body 9a that substantially spans the width of the internal space of the garbage container 2, and a support frame 9b that is integrally connected to the rear surface of the discharge plate main body 9a. A guide mechanism 6 is provided between the discharge plate 9 and the garbage container 2 to guide and support the discharge plate 9 so as to be slidable back and forth in an upright posture. A single-stage or multi-stage (telescopic type) hydraulic discharge cylinder 7 is connected between the back surface of the discharge plate 9 and the garbage container 2 to drive the discharge plate 9 forward and backward in the longitudinal direction of the vehicle. The discharge cylinder 7 is arranged so as to extend in the front-rear direction substantially along the bottom wall 2a of the garbage container 2. As shown in FIG.

With the configuration of the above discharge device 5, the garbage truck 1 extends the discharge cylinder 7 and moves the discharge plate 9 to a rear position protruding from the garbage storage box 2, so that the garbage stored in the garbage storage box 2 can be discharged to the outside. In addition, the garbage truck 1 is provided with a discharge plate front end detection sensor 17, which is a proximity sensor for detecting that the discharge plate 9 is at the frontmost position, on the front wall of the garbage storage box 2.

In addition, the garbage truck 1 uses the configuration of the discharge device 5 described above to realize a discharge plate operation function. This discharge plate operation function starts loading garbage by the loading device 4 with the discharge plate 9 positioned at the rear of the vehicle, and as the amount of garbage loaded into the garbage storage box 2 increases, By gradually moving the discharge plate 9 to the front of the vehicle, it is a function to expand the storage space of the trash in the trash storage box 2. More specifically, when the ejection plate operating function is used, when the storage space 2c is empty, the ejection plate 9 is positioned at the initial position indicated by the solid line in FIG. In this way, the garbage loaded in the garbage storage box 2 by the loading device 4 is compressed between the loading device 4 and the discharge plate 9. When the amount of garbage loaded increases, the PLC detects this based on the output value of a pressure sensor 32 (see FIGS. 6 and 8), which will be described later, and operates the pressure control valve 23c (see FIG. 6). As a result, the discharge cylinder 7 is gradually contracted to move the discharge plate 9 forward, thereby expanding the storage space 2c. A user such as the driver of the garbage truck 1 can select whether or not to use the discharge plate operation function.

Next, the garbage throwing box 3 will be explained. As shown in FIG. 1, the rear end opening of the garbage storage box 2 is connected with a garbage throwing box 3 having a throwing port 3a into which garbage can be put at the rear end. The trash throwing box 3 is rotatable around a fulcrum 3c provided at the top, so that the trash storage box 2 can be opened and closed. The trash throwing box 3 rotates between a closed position that closes the rear end opening of the trash storage box 2 and an open position that opens the rear end opening by rotating upward and can discharge the trash. It's like In addition, an opening 3b is provided at the front lower portion of the garbage input box 3 for storing garbage in the garbage storage box 2.

Next, with reference to FIG. 1, the loading device 4 provided in the garbage throwing box 3 will be described. First, the left and right side walls 3d of the garbage box 3 are provided with guide rails 11 extending obliquely up and down. can do. The slider 10 is integrally formed by connecting left and right members having a side shape as shown in FIG. 1 with a plate or the like (not shown) extending in the vehicle width direction. A pushing plate 13 is rotatably attached to the lower end of the slider 10 via a pin 10a. The push-in plate 13 is also formed by connecting and integrating the left and right members of the side surface shape shown in FIG. 1 with a plate or the like (not shown) extending in the vehicle width direction.

On the other hand, the cylinder side end of the push cylinder 14 is attached to the left and right side walls 3d by a pin 14a, and the piston side end of the push cylinder 14 is connected to the upper end of the slider 10 by a pin 14b. On the other hand, the cylinder side end of the press cylinder 15 is connected to the pushing plate 13 by a pin 15a, and the piston side end of the press cylinder 15 is connected to the upper end of the slider 10 by a pin 14b. The slider 10 is obliquely raised together with the push plate 13 by the extension operation of the push cylinder 14 and is obliquely lowered by the contraction operation of the push cylinder 14 . When the press cylinder 15 is extended, the pushing plate 13 rotates clockwise around the pin 10a, and when the press cylinder 15 is retracted, it rotates counterclockwise.

Due to the configuration of the loading device 4, the garbage thrown into the garbage throwing box 3 is compressed by the primary compression and secondary compression processes after moving to the rear position by the reversing process of the pushing plate 13, and by the pushing process It is pushed into the garbage storage box 2. This operation is regarded as one cycle, and the garbage put into the garbage input box 3 is loaded into the garbage storage box 2. In order to operate each of the above processes sequentially, there is a slider 10 (or push cylinder 14) at an upper end position and a lower position, and a push plate 13 at a rear position and a front position. Four sensors (the push-in completion detection sensor, the primary compression completion detection sensor, the reversal completion detection sensor, and the secondary compression completion detection sensor in FIG. 8) are provided to detect each movement to the .

Next, the details of the loading operation by the loading device 4 will be described. The loading operation by the loading device 4 is performed by extending and retracting the push cylinder 14 and the press cylinder 15, thereby rotating the pushing plate 13 backward from the front position to the rear position while the slider 10 is held at the raised position. a primary compression step performed by lowering the slider 10 from the raised position to the lowered position with the pushing plate 13 held at the rear position; A series of a secondary compression process performed by forward rotation from the rear position to the front position, and a pushing process performed by raising the slider 10 from the lowered position to the raised position while the pushing plate 13 is held at the front position. is performed by the process of By performing the above loading operation, the garbage that has been thrown into the garbage throwing box 3 is forcibly pushed into the garbage storage box 2. More specifically, in the pushing process, the push cylinder 14 is extended to move the slider 10 from the lowered position while the pressing plate 13 is held at the front position by maintaining the extended state of the press cylinder 15. This is done by raising it to the raised position.

Next, with reference to FIG. 3, the mechanism of opening and closing the garbage throwing box 3 will be described. A pair of swing cylinders (hydraulic actuators) 18 arranged at both left and right ends of the garbage throwing box 3 has its upper end attached to the garbage storage box 2 and its lower end attached to the garbage throwing box 3. When this swing cylinder 18 is extended, the dust throw-in box 3 is rotated upward (opened) as indicated by the two-dot chain line in FIG. , is pivoted downward (closed).

Next, with reference to FIG. 4, the locking device 19 for lashing the garbage throwing box 3 to the vehicle body frame F will be described. FIG. 4 shows the rear side of the garbage truck 1 locked by the locking device 19 . The lock device 19 is provided at the rear portion of the body frame F. As shown in FIG. The lock device 19 includes a hook 40 rotatably attached to the vehicle body frame F side, a lock pin 41 fixed to the trash throwing box 3 side, and a lock cylinder (hydraulic actuator) 42 for rotating the hook 40. and a connecting mechanism 43 that connects the hook 40 and the lock cylinder 42 .

The hook 40 is rotatably attached to a bracket 44 fixed to the lower surface of the vehicle body frame F via a pin 40a. The lock pin 41 is fixed to the lower front surface of the garbage throwing box 3 . In the locked state, the tip of the hook 40 is detachably engaged with the lock pin 41 from below. A cylinder-side end of the lock cylinder 42 is attached to the lower portion of the garbage container 2 via a pin 42a. A piston-side end of the lock cylinder 42 is attached to a first connection bracket 43c, which will be described later, via a pin 43f. The piston diameter of the lock cylinder 42 is smaller than the piston diameter of the swing cylinder 18 .

The above-mentioned connection mechanism 43 includes a torque shaft 43a rotatably attached to the bottom of the garbage storage box 2, a first connection bracket 43c and a second connection bracket 43d fixed to the outer peripheral surface of this torque shaft 43a, and a second It is composed of two connecting brackets 43d and connecting pieces 43e that connect the hooks 40 together. One end of the connecting piece 43e is attached to the second connecting bracket 43d via a pin 43g, and the other end of the connecting piece 43e is attached to the base end of the hook 40 via a pin 43h.

Due to the configuration of the lock device 19, when the lock cylinder 42 is extended from the locked state shown in FIG. 4, the torque shaft 43a rotates counterclockwise in FIG. 4 via the first connection bracket 43c. As a result of this rotation, the connecting piece 43e is pushed rightward in FIG. 5 via the second connecting bracket 43d, and the hook 40 rotates clockwise in FIG. 5 around the pin 40a. do. As a result, the engagement between the hook 40 and the lock pin 41 is released, and the trash box 3 is unlocked. Also, when the lock cylinder 42 is contracted from the state of FIG. 5, the hook 40 is engaged with the lock pin 41 by the movement of the connecting mechanism 43 in the opposite direction to the above, and the garbage container 3 closes the opening 3b. Locked when closed.

In addition, as shown in FIG. 1, an inlet 3a into which garbage is thrown is formed at the rear part of the garbage throwing box 3, and a slide cover 16 is provided for opening and closing the throwing opening 3a by sliding it up and down. ing.

Next, referring to FIG. 6, a hydraulic circuit diagram regarding the push cylinder 14, the press cylinder 15, the discharge cylinder 7, and the swing cylinder 18 will be described. As shown in FIG. 6, this hydraulic circuit includes an oil tank 21, a hydraulic pump 22, pressure control valves 23a to 23f, a push cylinder electromagnetic switching valve 24, a press cylinder electromagnetic switching valve 25, and a discharge cylinder electromagnetic switching valve 26. , electromagnetic switching valve for swing cylinder (also used as electromagnetic switching valve for lock cylinder) 27, switching valves 28a to 28b, check valves 29a to 29g, filters 30a to 30b, lock cylinder 42, and pressure sensor 32 are connected. It is

When the push plate 13 is stopped at the front position (original position), both the push cylinder 14 and the press cylinder 15 are in the extended state, and the corresponding electromagnetic switching valves 24 and 25 are in the neutral position. When the solenoid 25s of the electromagnetic switching valve 25 for the press cylinder is energized, "reverse" is performed. When the solenoid 25e is energized, "secondary compression" is performed. When the solenoid 24s of the electromagnetic switching valve 24 for the push cylinder is energized, " "Primary compression", and when the solenoid 24e is energized, "push" are performed.

When the discharge plate 9 is stopped at the rearmost position indicated by the solid line in FIG. 1, the discharge cylinder 7 is in the most extended state, and the discharge cylinder electromagnetic switching valve 26 is in the neutral position. When the solenoid 26e of the discharge cylinder electromagnetic switching valve 26 is excited, the discharge cylinder 7 is driven to extend. Further, when the solenoid 26s is energized, the discharge cylinder 7 is contracted. When the solenoid 26s is demagnetized from this state, the discharge cylinder electromagnetic switching valve 26 returns to the neutral position, and the contraction drive of the discharge cylinder 7 is stopped. However, if the pressure control valve 23c operates, the discharge cylinder 7 can be contracted and the discharge plate 9 can be moved forward even if the electromagnetic switching valve 26 for the discharge cylinder is in the neutral position.

When the trash box 3 is in the downward rotating position indicated by the solid line in FIG. 1, the swing cylinder 18 is in the most contracted state, and the electromagnetic switching valve 27 for the swing cylinder is in the neutral position. The switching valve 28b is at the position shown in FIG. When the solenoid 27e of the swing cylinder electromagnetic switching valve 27 is energized from this state, the lock cylinder 42 operates in the unlocking direction, the swing cylinder 18 is driven to extend, and the garbage container 3 rotates upward. Then, when the swing cylinder 18 is driven to the maximum extension position, the garbage throwing box 3 reaches the upward rotation position.

When the solenoid 27e of the electromagnetic switching valve 27 for the swing cylinder is deenergized and the switching valve 28b is energized, the hydraulic oil in the swing cylinder 18 is pushed by the weight of the dust box 3 to the switching valve 28b and the electromagnetic for the swing cylinder. It is returned to tank 21 via valve 27 . As a result, the swing cylinder 18 is driven to contract, and the garbage throwing box 3 rotates downward. Further, when the solenoid 27s of the swing cylinder electromagnetic valve 27 is energized after the dust throwing box 3 reaches the downward rotation position, the lock cylinder 42 is locked and the dust throwing box 3 is locked. After that, the solenoid 27s is de-energized, but the lock cylinder 42 is kept locked by the check valve 29g.

Further, the pressure sensor 32 ("pressure detecting means" in the claims) is arranged in a conduit 33 connecting the hydraulic pump 22 and the press cylinder 15, and is used to press the dust by (the pushing plate 13 of) the loading device 4. Detect pressure.

Next, referring to FIG. 7, the operating device provided in the operator's cab C will be described. A switch box 60 provided in the operator's cab C is provided with a main switch 60a, a throw-in box switch 60b, a discharge switch 60c, a scraping switch 60d, a main lamp 60e, and a lock lamp 60f. The main switch 60a is a switch that can be held at any one of "loading", "OFF", and "discharging" positions. By doing so, the driving of the discharge cylinder 7 and the swing cylinder 18 is restricted, and the driving of the push cylinder 14 and the press cylinder 15 is permitted, thereby enabling the loading operation. When a user such as a driver operates the main switch 60a from "OFF" to the "discharge" position, driving of the push cylinder 14 and the press cylinder 15 is regulated, and the discharge cylinder 7 and the swing cylinder 18 are controlled. is allowed to drive.

The throw-in box switch 60b is a switch for instructing the rise or fall of the refuse throw-in box 3. When the throw-in box switch 60b is operated "up", the refuse throw-in box 3 rises, and when operated "down", The garbage throwing box 3 descends. This input box switch 60b is a type of switch that returns to the neutral position of "OFF" when the hand is released. The discharge switch 60c is a switch for moving the discharge plate 9. When the discharge switch 60c is operated to "discharge", the discharge cylinder 7 is extended and the discharge plate 9 is retracted to the rearmost position and then to "return". When operated, the ejection plate 9 returns (moves) forward. The discharge switch 60c is also a type of switch that returns to the neutral position of "OFF" when the hand is released.

The scraping switch 60d is a switch for selecting "automatic" or "manual", and the user sets the scraping switch 60d to the "automatic" position and operates the throw-in box switch 60b to "up" to throw in the garbage. After rotating the box 3 to the upper end, when the hand is released from the input box switch 60b, the same operation as loading is automatically performed, and the garbage remaining at the bottom of the trash input box T is discharged. can be done. In addition, when the user operates the throw-in box switch 60b to "up" and raises the garbage throw-in box 3, when the scraping switch 60d is set to the "manual" position, the same operation as loading is performed, and the garbage is thrown. The dust remaining at the bottom of the box 3 can be discharged. The scraping switch 60d is also of a type that returns to the neutral position of "OFF" when the hand is released.

The main lamp 60e is lit when each switch of the switch box 60 is operable. The lock lamp 60f is lit when the lock device 19 is in the locked state as shown in FIG.

Next, with reference to FIG. 3, the operating device provided in the garbage throwing box 3 will be described. Switch boxes 61 and 62 are provided at the rear portions of the left and right side walls 3d of the garbage throwing box 3, respectively. On the side of the switch box 61, an operation selection switch 61a (indicated by a dashed line) is provided for selecting either a "continuous cycle" or a "single cycle" operation mode for the operation of the loading device 4. , on the front of the switch box 61 are a loading switch 61b for starting the loading operation in each of the above operation modes, a stop switch 61c for stopping the continuous cycle operation, and a collecting (currently collecting ) A special specific gravity garbage changeover switch 61d (corresponding to "special specific gravity collected object instruction input means" in the claims) for inputting an instruction that the specific gravity of garbage differs from the average specific gravity of garbage by a predetermined threshold or more is provided. there is Here, the specific gravity of the garbage to be collected is different from the specific gravity of the average garbage by a predetermined threshold or more, for example, the specific gravity of the garbage to be collected is 1.5 times or more than the specific gravity of the average garbage (garbage). or two-thirds or less, specifically, when the garbage (garbage) to be collected is garbage such as used diapers, styrofoam, cardboard, etc., whose specific gravity is significantly different from that of general garbage. corresponds to Other switches are switches that are used only in an emergency, and detailed description thereof will be omitted. The stop switch 61c is also provided in the switch box 62 on the right side.

Next, referring to FIG. 8, a PLC (Programmable Logic Controller) 70 corresponding to the control device of the garbage truck 1 and signals input to and output from the PLC 70 will be described. The PLC 70 has a timer 71 and the like in addition to a CPU and memory. The PLC 70 corresponds to the weight calculation means in the claims, and calculates an approximate value of the weight of the garbage that has been loaded into the garbage storage box 2.

The PLC 70 receives instruction signals from the main switch 60a, the throw-in box switch 60b, the discharge switch 60c, and the scraping switch 60d described in FIG. 61c, an instruction signal from the special specific gravity dust selector switch 61d is input. The PLC 70 also receives detection signals from the inversion completion detection sensor 65 , the primary compression completion detection sensor 66 , the secondary compression completion detection sensor 67 , and the pushing completion detection sensor 68 . The inversion completion detection sensor 65 is a sensor for detecting that the push plate 13 has moved to the rear end position (rear position), and the secondary compression completion detection sensor 67 detects that the push plate 13 has moved to the front end position (forward position). The primary compression completion detection sensor 66 is a sensor for detecting that the slider 10 (or the push cylinder 14) has moved to the lowered position. A sensor for detecting movement to the upper end position.

The PLC 70 also receives an output signal from the ejection plate front end detection sensor 17 described in FIG. 1 and an output signal from the pressure sensor 32 described in FIG.

The solenoids 24e to 27e and 24s to 27s of the push cylinder electromagnetic switching valve 24, the press cylinder electromagnetic switching valve 25, the discharge cylinder electromagnetic switching valve 26, and the swing cylinder electromagnetic switching valve 27 are controlled by output signals from the PLC 70. It is energized and demagnetized. Also, the main lamp 60e and the lock lamp 60f are turned on/off by an output signal from the PLC 70. FIG.

Next, with reference to the flowchart of FIG. 9, the weight calculation process by this garbage truck 1 is demonstrated. This weight calculation process is a process of calculating an approximation of the weight of the garbage that has already been loaded into the garbage container 2 . When a user such as a driver operates the discharge switch 60c (see FIG. 7) provided in the driver's cab C to the "discharge" side (YES in S1), the PLC 70 causes the discharge device 5 to operate the discharge plate 9 By moving the to the rear position protruding from the garbage storage box 2, after completing the operation (hereinafter referred to as "discharge operation") to discharge the garbage loaded in the garbage storage box 2 (S2), the discharge flag is turned on (S3). Then, when the PLC 70 detects that the user such as the driver has operated the main switch 60a (see FIG. 3) to the "loading" side (YES in S4), an approximate expression setting process, which will be described in detail later, is performed. (Switching processing of the approximation formula used for weight calculation) is performed (S5).

After the approximate expression setting process of S5, the PLC 70 performs the above-described loading operation by the loading device 4 in response to the ON process of the loading switch 61b by the user such as the driver (S6). When the pushing process is completed (when an ON signal is input from the pushing completion detection sensor 68) (YES in S7), based on the approximate expression set in S5, the weight of the garbage loaded in the garbage storage box 2 is calculated (S8). After this weight calculation process, if the operation selection switch 61a is not set to the "one cycle" (single) mode (is set to the "continuous cycle" mode) (NO in S9), the PLC 70 repeats the processes of S6 to S8. On the other hand, when the operation selection switch 61a is set to the "one cycle" (single) mode (YES in S9), the PLC 70 operates the main switch 60a to the "OFF" position. Until (NO in S10), the processing of S4 to S9 is repeated.

Next, with reference to FIG. 10, the approximate expression setting process of S5 will be described. When the user such as the driver turns on the special gravity garbage changeover switch 61d when the specific gravity of the garbage (garbage) on the current collection (loading) route is relatively close to the specific gravity of general garbage (specific gravity of average garbage). If not (NO in S21), the PLC 70 operates the discharge plate operation function only when the discharge flag is ON (when the loading operation is performed for the first time after the discharge operation in S2 is completed) (YES in S22). Set processing of the approximation formula according to the use or non-use of In the process of setting the approximate expression according to whether or not the ejection plate operating function is used, the PLC 70 first determines whether or not the ejection plate operating function is being used (S23). Specifically, the PLC 70, for example, when detecting that the loading switch 61b is turned ON, based on whether the discharge plate 9 is at the front end of the garbage storage box 2, the discharge plate operation function is used. At this time, the PLC 70 determines that the ejection plate operation function is used if the ejection plate 9 is not at the front end of the garbage storage box 2, and if the ejection plate 9 is at the front end of the garbage storage box 2, the ejection plate operation Determine that the function is not used. Determination of whether or not the discharge plate 9 is at the front end of the dust storage box 2 may be performed based on the output signal of the discharge plate front end detection sensor 17, and the stroke of the discharge cylinder 7 may be a predetermined A stroke sensor may be provided to detect whether the contraction is longer than the length, and the detection may be performed based on the output signal of this stroke sensor. Further, the elapsed time after the eject switch 60c is operated to the "eject" side and then to the "return" side is calculated based on the output value from the timer 71 (see FIG. 8). It may be determined that the discharge plate 9 is at the front end of the garbage container 2 when the time exceeds a predetermined number of seconds.

If it is determined in S23 that the discharge plate operation function is being used (YES in S23), the PLC 70 uses the approximate expression used to calculate the approximate value of the weight of the trash to The power approximation approximation formula (Formula A) with the number of times of loading as the variable x is set (switched) (S23). Specifically, the formula A is a formula represented by y=ax ^b (where x is the number of times the dust is loaded by the loading device 4, and a and b are constants). The above constants (such as coefficients) a and b are set to constants for when the discharge plate operation function is used. Also, the number of times of loading x mentioned above is the number of times of loading for one garbage truck 1 (the total from the previous garbage discharge at the cleaning center to the current garbage station on the collection route). Note that power approximation means approximation that results in a linear relationship on a log-log graph.

When it is determined in the above S23 that the discharge plate operation function is not used (NO in S23), the PLC 70 sets the approximate expression used for calculating the approximate value of the weight of the garbage to the weight of the garbage by the loading device 4. The approximation formula of linear approximation with the number of times of loading as variable x or the approximation formula of exponential approximation with the number of times of loading as variable x (formula B) is set (switched) (S25). Specifically, the formula B is a formula represented by y = ax + b or y = ax ^b (where x is the number of times the garbage is loaded by the loading device 4, and a and b are constants). . Constants (such as coefficients) a and b are set to constants when the ejection plate operation function is not used (constants different from the constants of the formula A used when the ejection plate operation function is used). In addition, the number of times of loading x in Expression B is also the number of times of loading for one garbage truck 1 (total from the previous garbage discharge at the cleaning center to the current garbage station on the collection route). Note that linear approximation means approximation using a linear function. Here, in the above S25, as to which of the linear approximation approximation formula and the power approximation formula B is to be used, for each refuse collection vehicle 1, the coefficient of determination of the linear approximation approximation formula and the power approximation formula are compared, and the approximation formula (linear approximation approximation formula or exponential approximation approximation formula) with a larger determination coefficient is selected.

In addition, when the user such as the driver determines that the specific gravity of the collected items (garbage) on the current collection route is significantly different from the specific gravity of general garbage (the average specific gravity of garbage), the special specific gravity garbage selector switch is activated. 61d is turned ON (YES in S21), the PLC 70 calculates the approximate expression used for calculating the approximate value of the weight of the dust based on the pressing pressure detected by the pressure sensor 32, the average The power approximation approximation formula (Formula C) with the pressing pressure as the variable x is set (switched) (S26). Here, the above-mentioned average pressing pressure is obtained by obtaining the average pressure value of the pressing pressure of the dust by (the pushing plate 13 of) the loading device 4 during the pushing process in each loading operation, and This value is the average of the above-mentioned average pressure values (total from the discharge of garbage to the current garbage station on the collection route).

After the PLC 70 performs the approximate expression setting process (switching process of the approximate expression used for weight calculation) in S24 to S26, the PLC 70 turns off the discharge flag (S27). As a result, except for the case where the special specific gravity garbage changeover switch 61d is turned ON, after the discharge operation of S2 is completed, the same approximation formula is used until the next discharge operation is performed. An approximation of the weight of the waste can be calculated.

Next, as shown in FIG. 10, the reason why the approximate expression used for calculating the approximate value of the weight of the garbage is switched between three types of approximate expressions will be described with reference to FIGS. 11 to 25. do. 11 to 25, "the number of times of loading" is the number of times of loading for one garbage truck 1 as described above. "Average pressure" is described by omitting the above-mentioned average pressing pressure. It is a value obtained by averaging the above average pressure values. However, since FIGS. 11 to 25 are intended for the data at the time of discharge at the cleaning center, the above "one vehicle" does not correspond to "the amount of time required to go around the collection route and perform discharge and measurement at the cleaning center." means "total". Also, "weight" in FIGS. 11 to 25 means the weight of garbage discharged at the cleaning center. The coefficient of determination (R ² ) is an index representing the accuracy of the prediction formula (approximate formula), and the closer it is to 1, the higher the precision of the prediction formula (when all points overlap the straight line of the prediction formula, R ² = 1). Generally, when R ² is 0.7 to 0.8 or more, it is judged that the prediction formula (approximation formula) is highly accurate (highly effective).

First, in the description of FIG. 10 above, when the specific gravity of the collected matter (garbage) is significantly different from the specific gravity of general garbage (the average specific gravity of garbage), the power approximation approximation formula with the average pressing pressure as the variable x The reason for using (Formula C) will be described with reference to FIGS. 11 to 15. FIG. In general, when the specific gravity of collected materials (garbage) is relatively close to (not significantly different from) the specific gravity of general garbage (specific gravity of average garbage), the above correlation between "average pressure" and "weight" yields the following: The correlation between the above "number of times of loading" and "weight" is stronger (the correlation coefficient is larger). However, the inventor of the present invention analyzed the correlation between the "number of times of loading" and the "weight" for a garbage truck 1 (car No. 36), and found that 15 It was found that the individual data are significantly different from the prediction formula (approximation formula) (y=a ₁ x + b ₁ ) obtained from the entire data. Therefore, a detailed analysis of the data in the area 80 described above revealed that these data were obtained when the main collected matter was used diapers, and the specific gravity of the collected matter (garbage) was the specific gravity of general garbage. (the specific gravity of the average dust), so it was found that the distribution was at a position that deviated greatly from the prediction formula obtained from the entire data.

Therefore, as shown in FIG. 11, "all data" including the data in the area 80 where the specific gravity of the collection is extremely large, and "correction data" excluding the data in the area 80 from all the data A prediction formula (approximate formula) and the coefficient of determination using this prediction formula were obtained. As a result, when excluding the data in the area 80 where the specific gravity of the collection is extremely large (in the case of "correction data"), the prediction formula of linear approximation and power approximation with the number of times of loading as the variable x , the coefficient of determination by the prediction formula (approximation formula) of any approximation method was greatly improved. This point represents the correlation (linear approximation) between the number of loadings and the weight for the above "all data" and the correlation (linear approximation) between the number of loadings and the weight for the above "correction data". This can be confirmed by looking at FIG. 13 as well.

On the other hand, regarding the prediction formulas of linear approximation and power approximation with the average pressing pressure (“average pressure”) as the variable x, the coefficient of determination by the prediction formula (approximation formula) of either approximation method is There was no significant difference in the coefficient of determination depending on the presence or absence of data within the extremely large area 80 . 14 showing the correlation (exponential approximation) between "average pressure" and "weight" for the above "all data" and the correlation between "average pressure" and "weight" for the above "correction data" This can be confirmed by looking at FIG. 15 representing (exponentiation approximation).

As described above, the prediction formula (approximation formula) of linear approximation and exponential approximation with the average pressing pressure (“average pressure”) as the variable x, the data in the area 80 where the specific gravity of the collection is extremely large There was no significant difference in the coefficient of determination between the presence and absence. Moreover, as shown in FIG. 11, with respect to the power approximation approximation formula with the "average pressure" as the variable x, the coefficient of determination for all data, including data with extremely high specific gravity of collections, is 0. .7973, and the accuracy of the approximation is quite high. For this reason, as shown in FIG. 10, when the specific gravity of the collected matter (garbage) is significantly different from the specific gravity of general garbage (the average specific gravity of garbage), the average pressing pressure ("average pressure") is An approximation formula (formula C) of exponential approximation with variable x is used. By using an approximation formula (formula C) of exponential approximation with the average pressing pressure (“average pressure”) as the variable x, the specific gravity of the collected items is higher than that of general garbage, as in the data in the area 80 described above. , Not only when the specific gravity of the collected material is considerably larger (more than a predetermined threshold), but also when the specific gravity of the collected material is considerably smaller (more than a predetermined threshold) than general garbage (garbage to be collected is mainly Styrofoam, cardboard, etc. than general garbage). It is possible to accurately calculate the approximate value of the weight of the garbage that has been loaded in the garbage storage box 2 even if the garbage is light.

Next, in the description of FIG. 10 above, when the discharge plate operation function is used, the power approximation approximation formula (formula A) with the number of times of garbage loading by the loading device 4 as a variable x is used to discharge The reasons for using the approximation formula (formula B) of linear approximation or exponential approximation with variable x representing the number of times the garbage is loaded by the loading device 4 when the board operation function is not used are explained in FIGS. 25 for explanation.

FIG. 16 shows 242 corrected data (data obtained by excluding data in area 80 from all data) of the data to be analyzed for car No. 36 shown in FIG. Result of analyzing the correlation between the number of times of loading and weight, and the correlation between average pressure and weight when the ejection plate operation function is not used (“no ejection plate”) and when the ejection plate operation function is not used is a table showing In addition, FIG. 21 shows the same correction data as above (from all data, the main collected items are used For 260 data excluding the data when it is a diaper), the number of loading times when the ejection plate operation function is used (“with ejection plate”) and when the ejection plate operation function is not used (“without ejection plate”) ” and “weight” and the correlation between “average pressure” and “weight” are analyzed.

FIG. 17(a) is a graph showing the analysis results of the correlation (linear approximation) between the number of loading times and the weight for the "correction data" of car No. 36, as in FIG. 13, and FIG. 17(a) is a graph showing the results of analyzing each data by dividing it into data for "with discharge plate" and data for "without discharge plate". FIG. 18(a) is a graph showing the analysis results of the correlation (exponential approximation) between the number of loadings and the weight for the "correction data" of car No. 36, and FIG. 18(b) is a graph included in FIG. FIG. 10 is a graph showing the results of analyzing the data obtained by dividing the data into the data for the case of "with discharge plate" and the data for the case of "without discharge plate". FIG. 19(a) is a graph showing the analysis results of the correlation (linear approximation) between average pressure and weight for the "correction data" of car No. 36, and FIG. 19(b) is included in FIG. 19(a). FIG. 10 is a graph showing the results of analyzing each data by dividing it into data for "with discharge plate" and data for "without discharge plate". FIG. 20(a) is a graph showing the analysis results of the correlation (exponential approximation) between the average pressure and the weight for the "correction data" of car No. 36, similar to FIG. 15, and FIG. FIG. 10 is a graph showing the results of analyzing each data included in (a) by dividing it into data for "with discharge plate" and data for "without discharge plate".

22 to 25 are graphs showing the analysis results of the 260 correction data items for car No. 46 shown in FIG. 24(a)(b) and FIG. 25(a)(b) are FIG. 17(a)(b), FIG. 18(a)(b) and FIG. (b) corresponds to FIGS. 20(a) and 20(b).

The data to be analyzed in FIGS. 16 to 25 are the above-described corrected data (data excluding data when the main collection is used diapers from all data). That is, the data to be analyzed in FIGS. 16 to 25 are data when the specific gravity of the collected matter (garbage) is relatively close to the specific gravity of general garbage (specific gravity of average garbage). Here, as described above, in general, when the specific gravity of the collected matter (garbage) is relatively close to (not greatly different from) the specific gravity of general garbage, the above correlation between "average pressure" and "weight" The correlation between the above "number of times of loading" and "weight" is stronger. For this reason, as can be seen from FIGS. 16 to 25, for both linear approximation and power approximation, rather than using an approximation formula with the “average pressure” as the variable x, the “number of times of loading” is used as the variable x. A more accurate approximate value can be obtained by using an approximation formula. Also, as can be seen from FIGS. 16 and 21, when using the approximation formula with the "number of times of loading" as the variable x, at least when the ejection plate operation function is used ("with ejection plate"), the approximation of linear approximation The coefficient of determination is higher and the accuracy of the approximation is higher when using an approximation formula of power approximation than when using a formula. This is because the user (work vehicle) such as the driver uses the discharge plate operation function when it is known that there is a large amount of garbage to be collected, but the amount of garbage that can be loaded into the garbage storage box 2 of the garbage collection vehicle 1 is Since there is a limit (if it is a 2-ton vehicle, it will converge to 2 tons), when there is a large amount of collected objects and the discharge plate operation function is used, the approximation formula of the power approximation is preferred to the approximation formula of the linear approximation. seems to apply.

Based on the above analysis, the inventors of the present invention, as shown in FIG. 10 above, when the discharge plate operation function is used, the power Using the approximation formula (Formula A), when the discharge plate operation function is not used, the approximation formula of linear approximation or exponential approximation with the variable x being the number of times of garbage loading by the loading device 4 is used. I did.

Next, in the description of FIG. 10, when the ejection plate operation function is used, the constants for when the ejection plate operation function is used are used as the constants a and b (coefficients, etc.) of the approximation formula (Formula A). However, when the ejection plate operation function is not used, the constants for when the ejection plate operation function is not used are used as the constants a and b (coefficients, etc.) of the approximation formula (Formula B). The reason is as follows. is. That is, when using the discharge plate operation function, while compressing the waste between the pushing plate 13 and the discharge plate 9 of the loading device 4, the waste is loaded into the waste storage box 2. For this reason, if the approximation formula (Formula A) when using the ejection plate operation function and the approximation formula (Formula B) when not using the discharge plate operation function are the same type of approximation formula (for example, exponential approximation with the number of times of loading as a variable x approximation formula) is used, the constants a and b of the approximation formula (Formula A) when the ejection plate operation function is used are naturally different from the constants a and b of the approximation formula (Formula B) when not using the function. because they are different. Analysis results in FIGS. 17(b), 18(b), 19(b), 20(b), 22(b), 23(b), 24(b) and 25(b) Therefore, even if the same type of approximation formula is used for the approximation formula when using the discharge plate operation function and the approximation formula when not using the discharge plate operation function, constants such as the coefficients of the approximation formula It was confirmed that there was a difference in (slope, intercept, etc.).

In particular, when the approximation formula of power approximation with the number of times of loading as the variable x is used for both the approximation formula (Formula A) when using the discharge plate operation function and the approximation formula (Formula B) when not using it. When using the discharge plate operation function, the waste is loaded into the waste storage box 2 while compressing the waste between the push plate 13 and the discharge plate 9 of the loading device 4, so when the discharge plate operation function is used The coefficient (slope) of the approximation formula (formula A) is larger than the coefficient (slope) of the approximation formula (formula B) when not in use.

17(b), 18(b), 19(b), 20(b), 22(b), 23(b), 24(b) and 25(b) From the analysis results in b), the optimal approximation formula differs depending on whether or not the discharge plate operation function is used. Using different weights will give you a more accurate approximation of the weight of the trash.

As described above, according to the garbage truck 1 of the present embodiment, whether or not the discharge plate operation function is used, and the specific gravity of the garbage to be collected differs from the average garbage specific gravity by a predetermined threshold or more (specific gravity of general garbage The approximation formula used for calculating the approximate value of the weight of the loaded garbage is switched depending on whether or not the By switching the approximation formula used for calculating the approximate value of the weight of the loaded garbage according to whether or not the discharge plate operation function is used, unlike the conventional garbage collection vehicle described in Patent Document 1, the discharge It is possible to calculate an approximate value of the weight of the garbage that has been loaded into the garbage container 2 by considering whether or not the board operation function is used. Therefore, it is possible to accurately calculate the approximate value of the weight of the garbage that has been loaded. can. In addition, according to whether the specific gravity of the garbage to be collected is different from the specific gravity of the average garbage by a predetermined threshold value or more, the approximation formula used for calculating the approximate weight of the garbage that has been loaded is switched. Unlike the conventional garbage truck described in Patent Document 1, when the specific gravity of the garbage to be collected is close to the specific gravity of the average garbage, and when the specific gravity of the average garbage is significantly different (the garbage to be collected (garbage) , used diapers, styrofoam, cardboard, etc.), the approximation formula used for calculating the approximate value can be switched, so the approximate value of the weight of the garbage that has been loaded into the garbage storage box can be accurately calculated. be able to.

Further, according to the garbage collection vehicle 1 of the present embodiment, when the discharge plate operation function is used, the approximate expression used for calculating the approximate value of the weight of the garbage is the number of times the garbage is loaded by the loading device 4. is switched to the approximation formula of exponential approximation with . Here, in general, when the specific gravity of the collected items (garbage) is relatively close to (not greatly different from) the specific gravity of general garbage, the correlation between the number of times of loading and weight is stronger than the correlation between average pressure and weight. . For this reason, using an approximation formula with the number of times of loading as the variable x can provide a more accurate approximation than using an approximation formula with the "average pressure" as the variable x. In addition, when it is known that there is a large amount of garbage to be collected, the user (work vehicle) such as the driver uses the discharge plate operation function, but the amount of garbage that can be loaded into the garbage storage box 2 of the garbage collection vehicle 1 is limited. (If it is a 2-ton vehicle, it converges to 2 tons.) Therefore, when there is a lot of collected objects and the discharge plate operation function is used, the power approximation approximation formula is better than the linear approximation approximation formula Fits well. Therefore, as described above, when the discharge plate operation function is used, the approximation formula used for calculating the approximate value of the weight of the garbage is an approximation of power approximation with the number of times of garbage loading by the loading device 4 as a variable. A more accurate approximation of the weight of the debris can be obtained by switching to the formula.

In addition, according to the garbage collection vehicle 1 of the present embodiment, when the specific gravity of the garbage to be collected differs from the specific gravity of the average garbage by a predetermined threshold or more (largely different from the specific gravity of general garbage), the approximation of the weight of the garbage The approximation formula used for value calculation is switched to a power approximation approximation formula with a variable of the average pressing pressure during the pressing process so far, which is calculated based on the pressing pressure detected by the pressure sensor 32 . Here, as described above, for the approximation formulas of linear approximation and exponential approximation in which the average pressing pressure (“average pressure”) is the variable x, the coefficient of determination by the approximation formula of any approximation method is There was no significant difference in the coefficient of determination depending on the presence or absence of data (see FIG. 12) in the area 80, which is extremely large (the specific gravity of the collected dust differs from the average specific gravity of the dust by a predetermined threshold or more). Moreover, as shown in FIG. 11, the approximation formula of the power approximation with the "average pressure" as the variable x has an extremely large specific gravity of the collected waste (the specific gravity of the collected waste is The coefficient of determination is 0.7973 for all data including data that differ by more than a threshold, and the precision of the approximation formula is quite high. Therefore, as described above, when the specific gravity of the garbage to be collected differs from the specific gravity of the average garbage by a predetermined threshold value or more, the approximate expression used for calculating the approximate value of the weight of the garbage is the average By switching to an approximation formula of exponential approximation with pressing pressure as a variable, a more accurate approximation value of the weight of garbage is obtained when collecting garbage having a specific gravity different from the average specific gravity of garbage by a predetermined threshold or more. be able to.

Further, according to the garbage truck 1 of the present embodiment, when the instruction input by the special specific gravity garbage switching switch 61d (see FIG. 3) is performed by the user, the approximate expression used for calculating the approximate value of the weight of the garbage is , the approximation formula is switched to the exponential approximation with the average pressing pressure as a variable. As a result, when the specific gravity of the garbage to be collected differs from the specific gravity of the average garbage by a predetermined threshold or more (largely different from the specific gravity of general garbage), the user can easily use the approximation formula to calculate the approximate value of the weight of the garbage. can be switched.

Variant:
The present invention is not limited to the configuration of each of the above embodiments, and various modifications are possible without changing the gist of the invention. Next, modified examples of the present invention will be described.

Variant 1:
In the above embodiment, depending on whether or not the discharge plate operation function is used, and whether or not the specific gravity of the garbage to be collected differs from the specific gravity of the average garbage by a predetermined threshold or more (largely different from the specific gravity of general garbage). to switch the approximation formula used to calculate the approximate value of the weight of the garbage. However, the present invention is not limited to this, and the approximation formula used for calculating the approximation value of the garbage weight may be switched depending only on whether or not the discharge plate operation function is used. For example, regardless of whether the specific gravity of the garbage to be collected differs from the average specific gravity of the garbage by a predetermined threshold or more, when the discharge plate operation function is used, the number of times the garbage is loaded by the loading device is set as a variable. Using a power approximation approximation formula (Formula A) with x, and when the discharge plate operation function is not used, a linear approximation or power approximation approximation formula ( Equation B) may be used. Alternatively, the approximation formula used to calculate the approximate weight of the garbage may be switched based only on whether or not the specific gravity of the garbage to be collected differs from that of the average garbage by a predetermined threshold or more. For example, when the specific gravity of the garbage to be collected differs from the average specific gravity of the garbage by a predetermined threshold value or more, as in the above embodiment, an approximation formula (formula C) of power approximation with the average pressing pressure as the variable x is used. , When the specific gravity of the garbage to be collected does not differ from the specific gravity of the average garbage by a predetermined threshold or more (relatively close to the specific gravity of general garbage), power approximation with the number of times of garbage loading by the loading device as the variable x You may make it use the approximation formula of.

Modification 2:
In the above-described embodiment, the approximation formula used to calculate the approximate value of the weight of the garbage is an approximation formula (formula A) of power approximation with the variable x being the number of times the garbage is loaded by the loading device 4, and by the loading device 4 An example of switching between a linear approximation or power approximation approximation formula (Formula B) with the number of times of garbage loading as a variable x and a power approximation approximation formula (Formula C) with the average pressing pressure as a variable x is However, the approximation formula used to calculate the approximate value of the weight of dust is not necessarily limited to linear approximation or power approximation, and other types of approximation formulas (cubic or higher functions, logarithmic functions, exponential functions, etc. approximation) may be used. The same kind of approximation formula with different constants may be switched.

Variant 3:
In the above embodiment, a special specific gravity dust selector switch 61d is provided for inputting an instruction that the specific gravity of the dust to be collected differs from the specific gravity of the average dust by a predetermined threshold or more. When the input is performed by the user, the approximation formula used to calculate the approximate value of the weight of the dust is switched to the power approximation approximation formula (Formula C) with the average pressing pressure as a variable. However, not limited to this configuration, for example, a detection device for detecting that the specific gravity of the garbage to be collected differs from the specific gravity of the average garbage by a predetermined threshold or more is provided in the garbage throwing box, and the output from this detection device Based on the signal, the approximation formula used for calculating the approximation value of the weight of the dust may be automatically switched to the power approximation approximation formula (formula C) with the average pressing pressure as a variable. Alternatively, the approximation formula used for calculating the approximate value of the weight of the dust may be switched based only on whether or not the user has input an instruction using the special gravity dust selector switch 61d. For example, when an instruction input by the special specific gravity dust changeover switch 61d is performed by the user, the power approximation approximation formula (Formula C) with the average pressing pressure as a variable x is used to indicate the special gravity dust changeover switch 61d. If the input is not performed by the user, an approximation formula of power approximation may be used in which the variable x is the number of times the garbage is loaded by the loading device.

Variant 4:
In the above embodiment, when the specific gravity of the collected dust differs from the average specific gravity of the dust by a predetermined threshold or more, an approximation formula (formula C) of power approximation with the average pressing pressure as the variable x is used. However, the present invention is not limited to this, for example, when the specific gravity of the garbage to be collected differs from the average specific gravity of the garbage by a predetermined threshold or more, an approximate expression of linear approximation with the average pressing pressure as the variable x is used. Alternatively, an approximation formula of linear approximation or exponential approximation with the variable x representing the number of times the garbage is loaded by the loading device 4 may be used. Further, in the above-described embodiment, when it is determined that the discharge plate operation function is being used, an approximation formula (Formula A) of exponential approximation with the variable x representing the number of times of garbage loading by the loading device 4 is used. However, the present invention is not limited to this, for example, when it is determined that the discharge plate operation function is used, linear approximation with the number of times of garbage loading by the loading device 4 as a variable x A formula may be used, or an approximation formula of linear approximation or exponential approximation with the average pressing pressure as a variable x may be used.

Variant 5:
In the above embodiment, when the specific gravity of the collected dust differs from the average specific gravity of the dust by a predetermined threshold or more, an approximation formula (formula C) of power approximation with the average pressing pressure as the variable x is used. However, the present invention is not limited to this. An approximation formula (formula C) of power approximation with variable x may be used.

1 Garbage collection vehicle 2 Garbage storage box 3 Garbage input box 4 Loading device 5 Discharge device 9 Discharge plate 32 Pressure sensor (pressure detection means)
61d Special specific gravity garbage changeover switch (special specific gravity garbage instruction input means)
70 PLC (weight calculation means)

Claims (2)

A trash storage box for storing trash,
A garbage throwing box having an inlet into which garbage is thrown from the outside,
A loading device for loading the trash thrown into the trash input box into the trash storage box;
A discharge device that has a discharge plate and discharges the garbage loaded in the garbage storage box to the outside by moving the discharge plate to the rear of the vehicle,
With the discharge plate positioned at the rear part of the vehicle, the loading of garbage by the loading device is started. In a garbage collection vehicle having a discharge plate operation function, which is a function of expanding the garbage storage space in the garbage storage box by moving it forward,
Further comprising weight calculation means for calculating an approximate value of the weight of the garbage loaded in the garbage storage box,
The garbage truck, wherein the weight calculation means switches the approximation formula used for calculating the approximate value of the weight of the garbage according to whether or not the discharge plate operation function is used. When the discharge plate operation function is used, the weight calculation means calculates the approximation formula used for calculating the approximate value of the weight of the garbage by exponential approximation using the number of times the garbage is loaded by the loading device as a variable. The refuse collection vehicle according to claim 1, characterized by switching to an approximation formula of .

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