JP2014121937A - Loaded article of work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a discharge capacity of a hydraulic pump to be automatically controlled to be switched to an optimum pump discharge capacity for each drive source in a loaded article of a work vehicle if the hydraulic pump can be selectively driven by an engine and an electric motor and even if whichever is used as the drive source.SOLUTION: A hydraulic pump P is constituted by a discharge capacity variable hydraulic pump and connected to a control device UK2, and the control device can control a discharge capacity of the hydraulic pump P to be changed. The control devices UK2 and UV control the discharge capacity of the hydraulic pump P to be switched over between a discharge capacity in a state in which an engine drives the hydraulic pump P and a state in which a motor drives the hydraulic pump P depending on driving states of the engine and the motor.

Description

  The present invention includes a bodywork mounted on a vehicle body of a work vehicle, particularly a hydraulically operated work machine, and a hydraulic pump that supplies hydraulic oil to the work machine, and the hydraulic pump can be driven by an electric motor. The present invention relates to a work vehicle bodywork.

In the conventional bodywork, for example, the dust collection work bodywork mounted on the body of the garbage truck, the hydraulic pump is driven exclusively by the power from the electric motor.
Japanese Utility Model Publication No. 55-51625

  The conventional work vehicle bodywork as described above has been improved so that the hydraulic pump can be selectively driven by the power of either the engine or the electric motor. It is conceivable that the hydraulic pump can be driven by the motor and by the engine in a place where there is no problem.

  In this case, depending on the operating environment and operating conditions, the optimum pump discharge capacity of the hydraulic pump differs depending on the driving state by the electric motor and the driving state by the engine. Even if the electric motor is running at a low speed, the required amount of discharge must be secured. On the other hand, when the engine is running, the engine must be driven at a high speed to prevent engine stalling. It is desirable not to become excessive.

  The present invention has been made in view of such circumstances, and the hydraulic pump can be selectively driven by any power of the engine and the electric motor, and the above-described technical problem in that case can be achieved with a simple structure. The object is to provide a work vehicle bodywork that can be solved.

  In order to achieve the above object, the invention of claim 1 is a bodywork mounted on the vehicle body of a work vehicle, and can be driven by any of an engine and an electric motor operated by electric power from a battery. Hydraulic pump, hydraulically-operated working machine that operates with the oil discharged from the hydraulic pump, a power selection / extraction mechanism that can selectively extract power from the engine and electric motor and transmit it to the hydraulic pump, and the engine and electric motor And a control device capable of switching between an engine driving state in which the hydraulic pump is driven by the engine by controlling the power selection / extraction mechanism and a motor driving state in which the hydraulic motor is driven by the electric motor, and the both driving states are arbitrarily connected to the control device. At least a power source selection switch for switching to the hydraulic pump, and the hydraulic pump is a variable discharge capacity hydraulic pump and the control The discharge capacity can be changed and controlled by the control device, and the control device drives the discharge capacity of the hydraulic pump when the engine is driven and the discharge capacity when the motor is driven. The switching control is performed according to the state.

  According to a second aspect of the invention, in addition to the feature of the first aspect of the invention, the control device sets the discharge capacity in the motor driving state to be larger than the discharge capacity in the engine driving state. It is characterized by that.

  According to a third aspect of the present invention, there is provided a hydraulic pump that is mounted on a vehicle body of a work vehicle, and that can be driven by any of an engine and an electric motor that operates with electric power from a battery, and the hydraulic pump. Hydraulically-operated working machine that operates with the discharge oil of the engine, a power selection / extraction mechanism that can selectively extract power from the engine and electric motor and transmit it to the hydraulic pump, and control the engine, electric motor, and power selection / extraction mechanism And a control device capable of switching between an engine driving state in which the hydraulic pump is driven by the engine and a motor driving state in which the hydraulic pump is driven by the engine, and a power connected to the control device for arbitrarily switching between the two driving states. At least a source selection switch, and the hydraulic pump has a characteristic that a discharge oil amount per unit time is constant in a predetermined pump rotation speed region. The pump is configured with a pump, and the controller rotates the pump speed of the hydraulic pump, and the pump speed in the engine drive state and the pump speed in the motor drive state are both in the predetermined pump speed region. And it controls so that the pump rotation speed in the said engine drive state may become higher than the pump rotation speed in the said motor drive state.

  In the present invention, the discharge capacity of the hydraulic pump refers to the amount of oil discharged per unit revolution of the hydraulic pump.

  As described above, according to the present invention, in the bodywork of a work vehicle, the hydraulic pump that supplies the hydraulic oil to the hydraulically operated work machine is selected from either the engine or the electric motor based on the operation input to the power changeover switch. Since it can be selectively driven by power, it is convenient to use the drive source of the hydraulic pump appropriately according to the work situation. Then, it becomes possible to drive each hydraulic pump by the engine.

  In particular, according to the invention of claim 1, the hydraulic pump is a discharge capacity variable type pump, and the discharge capacity of the hydraulic pump in the engine driving state and the discharge capacity in the motor driving state are switched according to the driving state. Since control is possible, even if the engine drive state and the motor drive state are switched at any time, the hydraulic pump can be automatically switched and controlled to the optimum pump discharge capacity for each drive state.

  In particular, according to the second aspect of the invention, since the discharge capacity in the motor drive state is set larger than the discharge capacity in the engine drive state of the hydraulic pump, in the motor drive state, for noise countermeasures and the like. In addition, even if the electric motor is set to low rotation, the required amount of discharged oil can be secured by setting the hydraulic pump to have a high discharge capacity. By setting the hydraulic pump to a low discharge capacity, it is possible to effectively prevent the amount of discharged oil from becoming excessive.

  In particular, according to the invention of claim 3, a hydraulic pump having a so-called constant flow characteristic in which a discharge oil amount per unit time is constant in a predetermined pump rotation speed region is used. The pump rotation speed in the engine driving state and the pump rotation speed in the motor driving state are both in the predetermined pump rotation speed region, and the pump rotation speed in the engine driving state is higher than the pump rotation speed in the motor driving state. Therefore, the hydraulic pump automatically switches the discharge capacity so that the discharge capacity in the motor drive state becomes larger than the discharge capacity in the engine drive state. Therefore, even if the electric motor is driven at a low speed, the hydraulic pump has a high discharge capacity, so that it is possible to secure the required discharge oil amount. Even high rotation to some extent the engine for strike prevention, hydraulic pump by a low discharge capacity becomes possible to effectively prevent the discharge amount oil becomes excessive.

The whole side view which fractured | ruptured one part which shows 1st Embodiment of the refuse collection vehicle carrying the bodywork concerning this invention Rear view of the garbage truck (viewed in the direction of arrow 2 in FIG. 1) Schematic explanatory diagram showing an example of a power transmission system of the garbage truck Control block diagram of the garbage truck Schematic explanatory diagram of a hydraulic circuit for operating each cylinder of the garbage truck Front view showing an example of an operation panel provided in the cab of the garbage truck (enlarged view of arrow 3 in FIG. 1) Front view showing an example of an operation panel provided on the side of the dust input box of the garbage truck (enlarged view of the portion indicated by arrow 7 in FIG. 2) Flow chart showing an example of a basic control procedure for drive source switching control Subroutine showing an example of work procedure of work implement when engine drive is selected (corresponding to step S6 in FIG. 8) Subroutine showing an example of work procedure of work implement when motor drive is selected (corresponding to step S11 in FIG. 8) The flowchart which shows an example of the control procedure which selects the validity / invalidity of a 1st, 2nd motor selection signal according to a work form. The flowchart which shows an example of the control procedure which variably controls the discharge capacity | capacitance (swash plate inclination angle) of a hydraulic pump according to the drive state of a hydraulic pump. The flowchart which shows an example of the control procedure of the alerting | reporting means relevant to a motor drive Control block diagram according to the second embodiment of the present invention (corresponding to FIG. 4) Discharge oil amount characteristic diagram of a hydraulic pump having constant flow characteristics according to a third embodiment of the present invention

  Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

  First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 13. FIGS. 1 and 2 show a garbage collection vehicle V as a work vehicle, which is a base vehicle Vb. The base vehicle Vb is composed of a bodywork K for collecting dust that is mounted on the vehicle body F after the assembly of the base vehicle Vb is completed. The base vehicle Vb is provided with a vehicle-side control device UV, and the bodywork K is provided with a bodywork-side control device UK.

  Referring also to FIGS. 3 and 4, the vehicle body F of the base vehicle Vb is connected to an engine E capable of applying a driving force to the wheels W, a battery B, and the battery B via an inverter 12. An electric motor M that operates with electric power from the battery B, and a power selection / extraction mechanism that can selectively extract the power of the engine E or the electric motor M from the engine E and a wheel drive system D as a drive system including the electric motor M. At least the PS and the vehicle-side control device UV that has a microcomputer as a main part and can control the engine E, the electric motor M, and the power selection / extraction mechanism PS are mounted.

  The wheel drive system D is configured such that wheels, that is, rear wheels W are linked and connected to the output side of the engine E via the transmission 10, and the input side of the transmission 10 and the output side of the engine E are connected to each other. An electromagnetic clutch 11 is connected between the clutch 11 and the transmission 10. A motor shaft (not shown) of the electric motor M is interposed in series between the clutch 11 and the transmission 10.

  If the electric motor M is de-energized with the electromagnetic clutch 11 connected and the motor shaft is idled by the vehicle-side control device UV, the output of the engine E is output from the electromagnetic clutch 11, the motor shaft and the transmission 10. Thus, the wheel W can be driven by the engine E because it is transmitted to the wheel W side. On the other hand, if the electric motor M is energized from the battery B while the electromagnetic clutch 11 is disconnected, the output of the electric motor M is transmitted to the wheel W side through the transmission 10, so that the wheel W travels with the electric motor M. Can be driven. As described above, the refuse collection vehicle V is a hybrid work vehicle capable of driving and driving the wheels W using either the engine E or the electric motor M as a power source.

  Further, since the electric motor M can generate an electromotive force with the idling of the motor shaft when the wheels W are driven to run by the engine E, the battery B can be charged with this. The electric motor M may also be used as a generator as described above, or a charging-dedicated generator driven by the engine E may be provided separately from the electric motor M, and the electric power generated by the generator Thus, the battery B may be charged.

  The engine E, the electric motor M, the battery B, and the electromagnetic clutch 11 are connected to the vehicle-side control device UV, and a starter switch S-SW for starting the engine E is also connected to the vehicle-side control device UV.

  In addition, the battery B shown in the block diagram of FIG. 4 includes a battery sensor including a voltmeter and an ammeter for detecting the state of the battery B, and vehicle-side control of power supply and charging between the battery B and the electric motor M. A charging / charging circuit unit that is controlled based on a control signal from the device UV is included. These sensors and the charging / charging circuit unit are connected to the vehicle-side control device UV, and in particular, a battery sensor that detects the remaining battery level is It is also connected to the bodywork side control device UK (second control device UK2 described later).

  Further, the engine E shown in the block diagram of FIG. 4 includes a sensor for detecting the state of each part of the engine, an onboard battery and an electric load part of the engine (for example, a spark plug, a starter motor, a generator, etc.) The charging / charging circuit unit for controlling the power supply / charging between the vehicle side control unit UV based on the control signal from the vehicle side control unit UV is included, and the engine side sensor and the charging / charging circuit unit are connected to the vehicle side control unit UV. Is done. Of the sensors provided in the engine E, in particular, a sensor that detects that the engine is in operation and outputs an engine operating signal is also connected to the bodywork side controller UK (second controller UK2). The

  Thus, each of the vehicle-side control device UV, the engine E, the electric motor M, and the battery B is actually connected by a plurality of power lines and / or signal lines, but the display is shown in FIG. Simplified.

  The transmission 10 is provided with a power take-out device PTO capable of taking out the output of the transmission at any time, and the output side of the power take-out device PTO is a part of the bodywork K, which will be described later. Linked to and linked to P. The power take-out device PTO is connected to the vehicle-side control device UV, and the output of the transmission 10 is changed to a wheel according to an operation input to the power take-off switch P-SW that is also connected to the vehicle-side control device UV. Transmission can be selectively switched between the W side and the hydraulic pump P side. That is, when the power take-off switch P-SW is off, the output of the transmission 10 is transmitted to the wheel W side and used for driving, but when the switch P-SW is turned on, the transmission The output of 10 is transmitted to the hydraulic pump P side and used for driving the pump. In addition, since the structure function of such a power take-out device PTO is conventionally known, further explanation is omitted.

  Thus, the electromagnetic clutch 11, the power take-out device PTO, and the power take-off switch P-SW constitute the power selective take-out mechanism PS in cooperation with each other.

  In the illustrated wheel drive system D, the engine E and the electric motor M are arranged in series with each other. However, in the present invention, the electric motor M and the engine E are connected in parallel to the transmission 10 side. Also good.

  By the way, the bodywork K has a box-shaped dust container 1 with a rear end opened as a base body (that is, a body body), and this dust container 1 is retrofitted onto the vehicle body F of the base vehicle Vb. Mounted and fixed. At the rear end of the dust storage box 1, a dust input box 3 having a dust input port 3a for inputting dust into the dust storage box 1 is provided at the rear end, and the dust input port 3a is connected to the open / close door 3t. It can be opened and closed. The upper end portion of the dust box 3 is pivotally supported on the upper rear end of the dust container 1 so that the dust box 3 can be rotated up and down by the first cylinder A1 for rotating the dust box. By moving it, the dust input box 3 opens the rear end opening 1a of the dust storage box 1 as shown by the solid line in FIG. 1, and opens the rear end opening 1a as shown by the chain line in FIG. It is possible to move at any time between the discharging position (raising position).

  A work machine capable of executing a loading step of forcibly loading the input dust in the input box 3 into the dust storage box 1 when the input box 3 is in the loading position. A dust loading device 2 is provided. The structure of the dust loading device 2 is a conventionally well-known structure called a compression plate type. In the illustrated example, the dust loading device 2 is supported on the left and right side walls of the dust container box 3 so as to be movable up and down at a position facing the rear end opening 1a of the dust container box 1. A lifting / lowering body 4, a second lifting / lowering cylinder A 2 for forcibly raising / lowering the lifting / lowering body 4, and a shaft that extends to the full width of the dust-filling box 3 and is pivotable to the lower part of the lifting / lowering body 4. A compression plate 5 to be supported and a third cylinder A3 for advancing and retreating the compression plate for forcibly turning the compression plate 5 are provided.

  Thus, the primary compression action performed by lowering the elevating body 4 from the raised position to the lowered position with the compression plate 5 held at the rear position, and the compression plate 5 performed with the elevating body 4 held at the lowered position. Secondary compression action performed by forward rotation from the rear position to the front position, and loading action performed by raising the elevating body 4 from the lowered position to the raised position with the compression plate 5 held at the forward position. By executing a series of dust loading cycles consisting of the following, the throwing dust in the dust throwing box 3 is forcibly pushed into the dust containing box 1. And in order to operate each said operation | movement sequentially, the several proximity switch which each detects the raising position of the raising / lowering body 4 and the falling position, and the back position and the front position of the compression board 5 in the appropriate place in the dust throwing-in box 3 is carried out. (Not shown) are provided, and these proximity switches are connected to a first control unit UK1 described later.

  In addition, the dust container 1 is provided with a dust discharge device 7 as a working machine for discharging dust stored in the box to the outside. The dust discharge device 7 includes a discharge plate 6 that extends to the full width in the dust storage box 1 and can be moved back and forth with respect to the dust input box 3 at the loading position, a back surface of the discharge plate 6, and a dust storage box. The first cylinder A1 is interposed between the first cylinder A1 and the fourth cylinder A4, which is interposed between the front part of the first cylinder A1 and drives the discharge plate 6 forward and backward with respect to the dust box 3. Then, when the dust input box 3 is in the discharge position (raised position), the discharge plate 6 is retracted in the dust storage box 1 to force the storage dust in the dust storage box 1 from the rear end opening 1a. It can be discharged.

  Referring also to FIG. 6, a front operation panel CF is provided in the cab of the base vehicle Vb, and the operation modes of the dust loading device 2 and the dust discharge device 7 are arbitrarily set in the front operation panel CF. Various operation switches CF-SW1 to 3 for selection operation, and second power source selection for switching operation between an engine driving state in which the hydraulic pump P is driven by the engine E and a motor driving state in which the electric motor M is driven. A switch M-SW2 and various notification lamps L1 to L5 are provided. The second power source selection switch M-SW2 outputs a motor selection signal only when it is turned on to select a motor drive state.

  The various operation switches of the front operation panel CF include, for example, a main switch CF-SW1 for operation selection operation, an up / down selection switch CF-SW2 that rotates the dust input box 3 up and down, and a discharge plate 6. An advance / retreat selection switch CF-SW3 for reverse operation and other operation switches (not shown) are included. The main switch CF-SW1 includes a loading selection position that permits the loading operation of the dust loading device 2, a discharge selection position that permits the discharging operation of the dust discharging device 7, and the dust loading device 2 and the dust discharging device. It is possible to arbitrarily select and operate the off position at which each operation of 7 is stopped, and it may be configured so that each of the three positions can be selected and held, or automatically from the loading selection position or the discharge selection position to the off position. You may comprise so that it can return. Thus, the main switches CF-SW 1 to 3, the up / down selection switch CF-SW 2, and the advance / retreat selection switch CF-SW 3 function as work completion switches for the dust discharge process.

  Referring also to FIG. 7, the rear operation panel CR is fixed and supported on the outer surface of the dust input box 3 around the dust input port 3a. The rear operation panel CR includes various operation switches CR-SW1 to 3 for arbitrarily selecting and operating the operation mode of the dust loading device 2, an engine driving state in which the hydraulic pump P is driven by the engine E, and the electric motor M. Is provided with a first power source selection switch M-SW1 for switching operation between the motor driving state driven by and various notification lamps L1 to L5. The power source selection switch M-SW1 outputs a motor selection signal only when it is turned on to select a motor drive state. In the illustrated example, the rear operation panel CR is disposed on the left side of the dust input port 3a of the dust input box 3, but in addition (or alternatively), the rear operation panel CR is provided on the right side of the dust input port 3. It may be arranged.

  The various operation switches of the rear operation panel CR include, for example, a loading switch CR-SW1 that outputs a command signal for starting the loading operation to the refuse loading device 2, and the loading cycle of the dust loading device 2 as 1 Single switch CR-SW2 for selecting whether to operate only once or continuously, emergency stop switch CR- to output a command signal for emergency stop of loading operation of the dust loading device 2 and discharging operation of the dust discharging device 7 SW3 and other operation switches (the description is omitted) are included. Thus, when the single unit switch CR-SW2 is switched to the single operation position while the continuous unit switch CR-SW2 is held in the continuous operation position and the loading cycle is continuously operated, the dust loading device 2 Since the loading operation ends at the same time as the end of the loading cycle being executed, the unit switch CR-SW2 also serves as a work end switch during continuous operation.

  Further, the various notification lamp groups on the front and rear operation panels CF and CR are in a state in which the hydraulic pump P can be normally driven by the electric motor M while a vehicle key switch (not shown) is turned on. A first notification lamp L1 as a first notification means for notifying that it is, a second notification lamp L2 as a second notification means for notifying that the remaining amount of the battery B has dropped below a predetermined value, and hydraulic pressure A third notification lamp L3 as third notification means for notifying that the pump P is being driven by the electric motor M (that is, the motor is being driven), and the remaining amount of the battery B sufficiently exceeds a predetermined value. The fourth notification lamp L4 as a fourth notification means for notifying that there is a fifth notification means as a fifth notification means for notifying that the power source selection switch M-SW1, 2 is in the operation position for selecting the motor drive state. 5 Notification lamp L5 Include also front and rear control panel CF, the CR, displays the notification content of the notification lamp L1~L5 are assigned respectively.

  The “state in which the electric motor M can be normally driven” notified by the first notification lamp L1 means that the remaining amount of the battery B (that is, the amount of electricity charged) is sufficient, that is, not less than a predetermined lower limit value. The electric system including the electric motor M and the battery B (hereinafter simply referred to as “electric system” in this specification) for ensuring the electric motor M to operate with the electric power from the battery B is not broken. A state (that is, a state in which the electric system functions normally without a failure such as disconnection, short circuit, or element breakage).

  Thus, after switching the main switch CF-SW1 of the front operation panel CF to the loading selection position and turning on the loading switch CR-SW1 of the rear operation panel CR, the loading of the dust loading device 2 is performed. Can be started, and if the main switch CF-SW1 is switched to the discharge selection position and the up / down selection switch CF-SW2 is operated to the raised position, the dust box 3 is rotated upward, and then If the advance / retreat selection switch CF-SW3 is operated to the discharge position, the discharge plate 6 can be moved backward to discharge the stored dust in the dust storage box 1.

  Note that the notification lamps L1 to L5 described above are appropriately color-coded for each notification function in order to make it easier to visually identify the notification function, or change the flashing mode of at least some of the notification lamps (for example, the flashing interval). May be changed). As the first to fifth notification means, instead of (or in addition to) the first to fifth notification lamps L1 to L5 in the illustrated example, sound generation means for generating a predetermined notification sound or announcement sound may be used. Is possible. In this specification, the notification lamps L1 to L5 are used in a broad concept including not only a light bulb and a pilot lamp but also an LED (light emitting diode) and a liquid crystal with backlight.

  In the illustrated example, the front operation panel CF is installed in the cab. However, in addition to or instead of this arrangement, a third operation panel (not shown) is provided outside the cab and from the dust bin 3. You may arrange | position in the site | part which spaced apart. For example, if the third operation panel is installed and fixed at an appropriate position on the side surface of the dust storage box 1, there is an advantage that it becomes relatively close to the loading switch CR-SW1 and the like of the rear operation panel CR and the wiring can be easily integrated. Further, if the third operation panel is installed and fixed in the front part of the refuse storage box 1, for example, near the control unit box UKB described later, there is an advantage that the wiring side control device UK is relatively close and wiring can be easily integrated. is there. In addition, the third operation panel is a magnet-removable wired remote controller or a wireless remote controller, and this is adsorbed and fixed to an arbitrary position of a vehicle (for example, the outer surface of the dust container 1) or an external fixed object where the worker is away from the dust input box 3. Or may be carried by an operator. As a result, even if the dust box 3 is raised as shown by the dotted line in FIG. 1 and the first power source selection switch M-SW1 is raised and displaced together with the rear operation panel CR, the front operation panel CF or the third operation panel The second power source selection switch M-SW2 can switch the drive source without any trouble.

  Further, in the refuse storage box 1, a hydraulic pump P for operating each of the hydraulically operated work machines mounted on the vehicle, that is, the dust loader 2 and the dust discharger 7 (hereinafter simply referred to as work machines 2 and 7). Is mounted. As shown in FIG. 5, the hydraulic circuit C includes a hydraulic pump P whose suction side is connected to an oil tank T, and a discharge side of the hydraulic pump P as a hydraulic oil chamber of the first to fourth cylinders A1 to A4. Between the oil tank T and the first to fourth valves v1 to v4 respectively interposed in the oil passages connected in parallel and the discharge side of the hydraulic pump P in order to keep the discharge pressure of the hydraulic pump P below a predetermined value. And a relief valve R.

  The first to fourth valves v1 to v4 are operated between the hydraulic oil chambers of the cylinders A1 to A4 and the hydraulic pump P so as to switch and control the operations of the corresponding cylinders A1 to A4 independently. It is configured to perform oil supply / discharge control. When each of the valves v1 to v4 is switched to the neutral position, at the same time, the valves v1 to v4 and the corresponding hydraulic oil chambers of the cylinders A1 to A4 are shut off, and the cylinders A1 to A4 are hydraulically locked. Thereby, the corresponding working machines 2 and 7 are stopped and locked at the working position at that time. In the illustrated example, the first to fourth valves v1 to v4 are centrally arranged as a multi-valve MV in a single base and unitized, and the multi-valve MV constitutes a valve device.

  The hydraulic pump P is composed of a variable displacement displacement type hydraulic pump, and in this embodiment, in particular, a plurality of plungers that are annularly arranged in a pump casing (not shown) and are slidably fitted, and end portions of the plungers It is composed of a swash plate plunger pump that has a swash plate that is in sliding contact with the pump casing and that can rotate relative to the pump casing. By changing the inclination angle of the swash plate, the operation stroke of each plunger, and hence the pump discharge capacity is changed. It is possible. An electric actuator A that drives the swash plate is linked to and connected to the swash plate to change the inclination angle. Since the structure of such a swash plate type plunger pump is conventionally well-known, further description is abbreviate | omitted. If such a swash plate type plunger pump is used as the hydraulic pump P, there is an advantage that the discharge capacity can be easily changed and the switching control can be performed quickly and accurately. The actuator A can be appropriately selected from an electromagnetic actuator, an electric motor or the like, and an electromagnetic actuator is used in this embodiment.

  By the way, the bodywork K is provided with a bodywork-side control device UK that is independent from the vehicle-side control device UV, and this is a control unit attached to an appropriate place (the front end portion in the illustrated example) of the dust container box 1. Built in box UKB. This bodywork side control unit UK is intended to control the operation of the work machines 2 and 7 in accordance with operation inputs to the various operation switches CF-SW1 to 3 and CR-SW1 to 3 of the front and rear operation panels CF and CR. A first control unit UK1 whose main part is a microcomputer capable of outputting a valve control signal to the multi-valve MV, and a signal exchange between the first control unit UK1 and the vehicle-side control unit UV; In other words, the second control unit UK2 that can perform the interface function is included. The vehicle-side control device UV and the bodywork control device UK are both activated by turning on the vehicle-mounted power supply when the vehicle key switch is turned on, and the key switch is turned off. In response to this, it becomes de-energized and stops operating.

  The first control unit UK1 is a control unit having basically the same structure as the control unit for work implements that is conventionally mounted and used in the garbage truck V so as to control the operation of the work implements 2 and 7. Are connected so that various operation switches CF-SW1 to 3; CR-SW1 to 3 provided on the front and rear operation panels CF and CR can receive the operation input signals. The first control unit UK1 is connected to a multi-valve MV (each valve v1 to v4) that controls the various cylinders A1 to A4 that operate the work machines 2 and 7, and sends an operation command signal to the valves v1 to v4. Can be output individually.

  Further, the first control unit UK1 sends an idle up signal for idling up the engine E to the second control unit UK2 when it is determined from the operation input states of the various operation switches that the work machines 2 and 7 are operating. In response to the input of the idle up signal, the second control unit UK2 sends a work implement operating signal indicating that the work implements 2 and 7 are operating to the motor control unit of the vehicle side control unit UV. In addition, an electronic governor signal is output to the engine control unit of the vehicle-side control device UV so that the engine speed can be increased (idle up).

  On the other hand, the first and second power source selection switches M-SW1, 2 are connected to the second control unit UK2 so as to receive the operation input signal, and the first to third notification lamps L1-5 are provided. It is connected so that the notification (lighting) operation can be performed by the output current from the second control unit UK2.

  In addition, the second control unit UK2 sends a motor drive command signal to the motor control unit of the vehicle-side control unit UV in response to the power source selection switches M-SW1 and M2 being turned on to output a motor selection signal. Based on the motor drive command signal and the work implement operating signal, energization from the battery B to the electric motor M (accordingly, motor operation) can be executed. That is, when receiving the motor drive command signal from the second control unit UK2, the vehicle-side control unit UV controls the engine E, the electric motor M, and the power selection / extraction mechanism PS so that the drive source of the hydraulic pump P is the electric motor M. When the motor drive command signal is not received from the second control unit UK2, the engine E, the electric motor M, and the power selection / removal mechanism PS can be controlled so that the drive source of the hydraulic pump P is the engine E. . Thus, the second control unit UK2 controls the hydraulic pump P with the engine E in response to an operation input to the first and second power source selection switches M-SW1, 2 and in cooperation with the vehicle-side control unit UV. The engine drive state to be driven and the motor drive state to be driven by the electric motor M can be switched.

  Further, the second control unit UK2 can input the output signal of the main switch CF-SW1 of the front operation panel CF to this, and the loading operation selection state or the discharge operation selection is made from the output signal. It is possible to determine whether it is in a state. Based on the determination result, the second control unit UK2 makes the switching operation signal from the power source selection switch M-SW1 valid while the loading operation is selected, but the switching operation signal from the power source selection switch M-SW2 is On the other hand, while the discharge operation is selected, the switching operation signal from the power source selection switch M-SW2 is validated, but the switching operation signal from the power source selection switch M-SW1 is invalidated.

  Further, a motor drive permission signal can be output from the vehicle side control device UV to the second control device UK2 side. However, the motor drive permission signal indicates that the electric system is normal and the battery B is out of battery (that is, the remaining amount is less than a predetermined lower limit), and the electric system is normal but the battery B The output mode (for example, duty ratio of the output signal) is set to be different from the case where the remaining amount of battery is reduced to a certain extent (that is, below a predetermined value higher than the predetermined lower limit value), and the electric system fails Alternatively, when the battery B has run out, the motor drive permission signal is not output. The motor drive permission signal may be output only while the vehicle-side control device UV is receiving the work implement operating signal.

  Although not shown, a failure diagnosis circuit for detecting the presence or absence of a failure in the electric system is provided between the battery B and the electric motor M. The failure diagnosis circuit and the battery sensor provided in the battery B are provided. Are input to the vehicle-side control device UV, so that the vehicle-side control device UV determines which output mode of the motor drive permission signal should be output or whether the output should be stopped. The

  Further, an engine operating signal for identifying whether the engine E is operating or stopped can be input from a sensor provided in the engine E to the second control unit UK2 of the body control unit UK. A battery remaining amount signal indicating the remaining amount of the battery B can be input from a sensor provided in the battery B, and is output when the engine E is started by an operation input to the starter switch S-SW. An engine start signal can be input from a sensor provided in the starter switch S-SW.

  Then, the second control unit UK2 has front and rear operation panels based on the motor drive permission signal from the vehicle side control unit UV and the motor selection signal from the power source selection switches M-SW1 and M2 input thereto. The first and fifth notification lamps L1 to L5 of CF and CR can be controlled (lighted), and the battery B is out of battery when the hydraulic pump P is driven (that is, the remaining amount falls below a predetermined lower limit value). Or an emergency stop signal is output to the first control unit UK1 when it is determined that an abnormality has occurred in the electrical system. In this case, when the first control unit UK1 receives the emergency stop signal from the second control unit UK2, the multi-valve MV ( A stop command signal is output to each valve v1 to v4). Further, when the starter switch S-SW is inadvertently input and the engine E is started while the hydraulic pump P is in the motor drive state, the second control unit UK2 sends an emergency stop signal to the first control unit UK1. In this case as well, the first controller UK1 outputs a stop command signal to the multi-valve MV (the valves v1 to v4) in order to control the operation of the multi-valve MV so that the work machines 2 and 7 are stopped urgently. Is output.

  The work implement emergency stop method based on the operation control of the multi-valve MV by the first control device UK1 described above is performed when the emergency stop switch CR-SW3 is turned on while the work implements 2 and 7 are operating. This is the same as the method in which the multi-valve MV is operated and controlled to the neutral position by UK1 and the working machines are stopped at once. In particular, in this embodiment, the wiring for outputting the emergency stop signal from the second control unit UK2 is connected to the wiring of the emergency stop switch CR-SW3. Therefore, for the emergency stop signal input from the second control unit UK2 The emergency stop signal can be sent from the second control unit UK2 to the first control unit UK1 without specially providing the input terminal of the first control unit UK1. It is also possible to directly connect the wiring for outputting the emergency stop signal from the second control device UK2 to the first control device UK1 without connecting to the wiring of the emergency stop switch CR-SW3.

  Thus, in the bodywork side control device UK of the present embodiment, the motor drive state and the engine drive state of the hydraulic pump P according to the operation input to the first and second power source selection switches M-SW1,2. When the switching control is performed, the signal input / output unit on the body side control device UK side of all signals to be exchanged between the body side control device UK and the vehicle side control device UV is the second control device. Only provided in UK2.

  Accordingly, in the bodywork side control unit UK, the interface function parts that should exchange information (signals) between this and the vehicle side control unit UV can be aggregated in the second control unit UK2, so Various operation switch groups CF-SW1 to 3 of the operation panels CR and CF; a conventionally known work machine control device (that is, the first control device) that controls the work machines 2 and 7 based on operation inputs to the CR-SW1 to 3 A new control unit UK corresponding to a hybrid work vehicle can be obtained by simply adding and connecting a newly developed second control unit UK2 to the control unit corresponding to UK1). Easy to build. As a result, the development cost can be reduced and the development period can be shortened. Also, a component (that is, a first work) is required between a normal type work vehicle that drives a hydraulic pump for a work machine only by an engine and a hybrid type work vehicle. The control device corresponding to one control device UK1 is shared.

  Further, as described above, the second control unit UK2 of the present embodiment is operated when the battery B runs out of the battery B or the electric system fails in the motor drive state of the hydraulic pump P, or the engine E is started. In this case, the signal output from the vehicle-side control device UV or the engine start signal is changed to a conventionally known emergency stop signal so that the first control device UK1 controls the operation of the multi-valve MV so as to stop the work machines 2 and 7 urgently. This is converted and output to the first control unit UK1. Therefore, in the bodywork side control unit UK, the conventionally known first control unit UK1 for controlling the work implement is used as it is, but an emergency stop signal is output from the second control unit UK2 having the interface function thereto. As a result, the work machine can be stopped urgently, and the overall control configuration can be simplified as much as possible.

  The second control unit UK2 is connected to the electromagnetic actuator A for driving the swash plate of the hydraulic pump P, and can output a swash plate angle change signal to the actuator A. Then, based on the swash plate angle change signal, the electromagnetic actuator A changes the swash plate angle to drive the stroke of each plunger of the hydraulic pump P, and thus the discharge capacity, whether the hydraulic pump P is in the engine drive state or the motor drive. Change control is performed according to whether or not it is in a state.

  For example, in the illustrated example, the second control unit UK2 outputs a swash plate angle change signal to the swash plate driving actuator A only in the motor driving state, whereby the discharge capacity of the hydraulic pump P in the motor driving state is output. (For example, 80 cc / rev) is set to be larger than the discharge capacity (for example, 63 cc / rev) in the engine driving state. As a result, even when the electric motor M is rotated at a low speed for noise countermeasures or the like in the motor driving state, it is possible to secure a discharge oil amount necessary for driving the work machine by setting the hydraulic pump P to a relatively high discharge capacity. It becomes. Further, in the engine driving state, even if the engine E is rotated to a certain degree of high speed to prevent engine stall etc., it is effective to set the hydraulic pump P to a relatively low discharge capacity, so that the amount of discharged oil becomes excessive. It becomes possible to prevent.

Next, the operation of the embodiment will be described.
[Loading process]
The loading process of the charged dust in the dust charging box 3 by the dust loading device 2 includes the dust charging box 3 at the loading position (solid line in FIG. 1) and the discharge plate 6 near the rear end of the dust storage box 1. The process is started in a state where each is held at a predetermined retracted position. In this case, after the main switch CF-SW1 of the front operation panel CF is operated to the loading position, the loading process is started by turning on the loading switch CR-SW1 of the rear operation panel CR. The loading cycle is operated only once or continuously according to the operation position of the continuous short selector switch CR-SW2. During continuous operation, if the short / short selector switch CR-SW2 is switched to the single operation position, the dust loading device 2 stops at the end of the loading cycle.

The dust pushed into the dust storage box 1 by the execution of the loading process is stored in the dust storage box 1 while being appropriately compressed between the discharge plate 6 and the dust loading device 2. In this case, in the illustrated example, the discharge cylinder A4 is gradually contracted by the compression reaction force that the discharge plate 6 receives from the stored dust, and the discharge plate 6 is gradually advanced.
[Discharge process]
When the garbage container 1 is filled with the contained dust, the garbage truck V is moved to the garbage disposal site. In the garbage disposal site, the main switch CF-SW1 of the front operation panel CF is operated to the discharge selection position, and if the vertical selection switch CF-SW2 is operated to the raised position, the dust input box 3 is rotated upward, Thereafter, when the advance / retreat selection switch CF-SW3 is operated to the discharge position, the discharge plate 6 can be moved backward to discharge the stored dust in the dust storage box 1. After the discharge process is completed, the up / down selection switch CF-SW2 is lowered to rotate the dust input box 3 back to the loading position, and the advance / retreat selection switch CF-SW3 is operated to advance. In a state where 6 is returned to the predetermined retracted position at the rear part of the dust storage box 1, the discharge plate 6 is made to stand still and stand by. Then, the garbage collection vehicle V is made to travel to the dust collection place, and the next loading process by the dust loading device 2 is started from the standby state.

  Thus, in the loading / discharging process, the first control unit UK1 of the body-side control unit UK mainly operates the operation switch groups CF-SW1 to 3, CR-SW1 to the front and rear operation panels CF and CR. 3 can be executed by outputting a valve control signal to the multi-valve MV in response to an operation input to the cylinder 3, and controlling the cylinders A1 to A4 of the work machines 2 and 7, and the control procedure is well known in the art. Description is omitted.

Next, FIG. 8 to FIG. 8 show examples of control procedures when the body control unit UK and the vehicle side control unit UV cooperate with each other to switch and control the drive source of the hydraulic pump P between the engine E and the electric motor M. This will be described with reference to the flowchart of FIG. These controls are performed in a state where the vehicle key switch UV and the body control device UK (first and second control devices UK1, 2) are energized with the vehicle key switch turned on. Executed.
[Basic flow of drive source switching control]
First, in FIG. 8, it is determined whether or not the power take-off switch P-SW is turned on (step S1). If the power take-off switch P-SW is turned on, the process proceeds to step S2, and the power source selection switches M-SW1 and M2 are switched. It is determined whether any of them has been turned on (that is, motor drive selection). If not (that is, engine drive selection), the process proceeds to step S3 to determine whether the engine is operating. If NO in step S3, the process proceeds to step S4 and the engine E is started. If the engine is operating, step S4 is skipped and the process proceeds to step S5. At this time, the hydraulic pump P is driven by the engine E. However, since the valves v1 to v4 of the multi-valve MV are in the neutral position, the oil discharged from the hydraulic pump P passes through the relief valve R and is on the oil tank T side. The cylinders A1 to A4 of the work machines 2 and 7 are placed in a standby state without being operated.

  In step S5, the operation switches of the work machines 2 and 7 are operated to input the loading process or the discharging process (for example, the main switch CF-SW1 is loaded and the loading switch CR-SW1 is turned on). If it is determined that there has been an operation input, the process proceeds to step S6, and the valves v1 to v4 of the multi-valve MV are switched and controlled in accordance with the operation input. The cylinders A1 to A4 are operated to execute the work of the work machines 2 and 7 (for example, loading work). The processing procedure of step S6 will be specifically described in the subroutine of FIG. On the other hand, if it is determined NO in step S5, a return is returned.

  If it is determined in step S2 that the power source selection switches M-SW1 and M2 are turned on (that is, motor drive selection), the process proceeds to step S7. In this step S7, it is determined whether or not the battery B is out of battery (that is, the remaining amount is lower than a predetermined lower limit value) and the electric system is normal and the motor can be driven. If it is determined that the result is NO (that is, the motor cannot be driven), the process proceeds to step S8, where it is determined whether the power source selection switch M-SW1, M2 is turned on (that is, the motor is selected). If the answer is NO (ie, engine drive selection) in step S8, the process proceeds to step S3. If the ON operation (ie motor drive selection) remains, the process returns. Therefore, until the power source selection switches M-SW1 and M2 are next turned off (that is, engine drive selection), the work machines 2 and 7 are in a standby state without starting work. When the determination in step S7 is negative (that is, the motor cannot be driven), since the motor drive lamp L1 is turned off, the operator can turn off the power source selection switches M-SW1 and M2 in the standby state (that is, select the engine drive). ).

  If it is determined in step S7 that the motor can be driven, the process proceeds to step S9. If the engine E is operating, the operation is stopped, and the process proceeds to step S10.

In step S10, as in step S5, it is determined whether or not the operation switches of the work machines 2 and 7 have been input to execute the loading process or the discharging process. If it is determined that the operation input has been made, the process proceeds to step S11, where a motor drive command signal is output from the second control unit UK2 to the vehicle side control unit UV, thereby operating the electric motor M and hydraulic pressure. While driving the pump P, the cylinders A1 to A4 of the work machines 2 and 7 corresponding to the operation input are operated to execute the work (for example, loading work) of the work machines 2 and 7, and the process of step S11 The procedure will be specifically described in the subroutine of FIG.
[Work flow when engine drive is selected]
FIG. 9 is a subroutine specifically showing the process of step S6 (FIG. 8). In FIG. 9, first, in step S101, work (for example, loading work) of the work machines 2 and 7 corresponding to the operation input of the operation switch is started in a state where the hydraulic pump P is driven by the engine E.

  Next, the process proceeds to step S102, in which it is determined whether the power source selection switches M-SW1, M2 and SW2 are turned on (that is, motor drive selection) during the above-described operation. If not (ie, engine drive selection), the process proceeds to step S103. It is determined whether the engine is in operation. If it is determined in step S103 that the engine is in operation, the process proceeds to step S110, the work of the work machines 2 and 7 in the engine drive state of the hydraulic pump P is continued, and then the process proceeds to step S111.

  If it is determined in step S102 that the power source selection switches M-SW1 and M2 are turned on (that is, motor drive selection), the process proceeds to step S109, and the on operation signal (motor selection signal) is controlled by the second control. Ignored by the device UK2, and then proceeds to step S110, whereby the work of the work machines 2 and 7 in the engine drive state of the hydraulic pump P is continued.

  If it is determined in step S103 that the engine is stopped (engine stopped), the process proceeds to step S104 to urgently stop the work of the working machines 2 and 7. In the emergency stop, the first control unit UK1 controls the valves v1 to v4 of the multi-valve MV to the neutral position in response to an emergency stop signal input from the second control unit UK2 to the first control unit UK1. Therefore, it is performed by outputting a stop command signal to the multi-valve MV. Next, the process proceeds to step S105 to step S107 in sequence, and after confirming that a predetermined resumption operation has been performed, the work is resumed. That is, in step S105, it is determined whether or not the power source selection switches M-SW1, 2 are still in the OFF operation position (engine drive selection position), and in step S106, it is determined whether the engine E has been restarted. In step S107, it is determined whether or not the operation switches CF-SW1 to 3 and CR-SW1 and 2 of the work machines 2 and 7 have been operated to resume the work. If neither is determined, the process proceeds to step S108. Thus, the work of the work machines 2 and 7 in the engine drive state of the hydraulic pump P is resumed, and then the process proceeds to step S111.

In step S111, when the condition for ending the work being executed is satisfied, for example, an operation input to the operation switch for ending the work (for example, switching operation of the main switch CF-SW1 to the off position or loading) It is determined whether or not it is a case where there is a single switch CR-SW2 during the continuous operation of the process and a single operation of the loading process is completed. If it is determined, the process proceeds to step S112 to end the work being executed and return. If it is determined NO in step S111, the process returns to step S102 to continue the work being executed.
[Work flow when motor drive is selected]
FIG. 10 is a subroutine specifically showing the process of step S11 (FIG. 8). In FIG. 10, first, in step S <b> 201, work (for example, loading work) of the work machines 2 and 7 according to the operation input of the operation switch is started in a state where the hydraulic pump P is driven by the electric motor M.

  Next, the process proceeds to step S202, in which the battery B has not run out of battery (that is, the remaining amount has fallen below a predetermined lower limit) and the electric system is normal and the motor can be driven. If it is determined that there is no (that is, the motor cannot be driven), the process proceeds to step S203, and the work of the working machines 2 and 7 is urgently stopped. As in the case of step S104, the emergency stop is performed by the first control unit UK1 when the emergency control signal is input from the second control unit UK2 to the first control unit UK1. Is output by outputting a stop command signal to the multi-valve MV.

  Next, the process proceeds to step S204 to step S206 in sequence, and after confirming that a predetermined resumption operation has been performed, the work is resumed. That is, in step S204, it is determined whether the power source selection switches M-SW1, M2 are operated to the off operation position (engine drive selection). In step S205, it is determined whether the engine E is started. In step S206, it is determined whether or not the operation switches CF-SW1 to 3 and CR-SW1 and 2 that function as work start switches of the work machines 2 and 7 are input to resume the work. Returns to step S207.

  In the step S207, the work of the work machines 2 and 7 (for example, loading work) corresponding to the operation input for resuming the operation of the operation switch is executed in the engine drive state of the hydraulic pump P. Is the same as that specifically described in the subroutine of FIG.

  If it is determined in step S202 that the determination is not negative (that is, the motor can be driven), the process proceeds to step S208, and whether the power source selection switches M-SW1 and M2 and SW2 are continuously turned on during operation (that is, motor driving is selected). If it is determined that the engine has been turned on (ie, motor drive is selected), the process proceeds to step S209 to determine whether or not the engine E has been started. If it is determined in step S209 that the engine has not been started (that is, the engine is still stopped), the process proceeds to step S214, and the work of the work machines 2 and 7 with the hydraulic pump P being driven is continued. Proceed to step S215.

  If it is determined in step S209 that the engine E has been started, the process proceeds to step S210, where the operation of the electric motor M is stopped and the start of the engine E is prohibited to maintain the engine stopped state. The process proceeds to S211. In step S211, as in step S203, the work of the working machines 2 and 7 is stopped urgently, and then the process proceeds to step S204.

  If it is determined in step S208 that the power source selection switches M-SW1 and M2 are turned off (ie, engine drive selection), the process proceeds to step S213, and the off operation signal is ignored by the second controller UK2. Thereafter, the operation of the work machines 2 and 7 in the motor drive state of the hydraulic pump P is continued by proceeding to step S214.

  In step S215, as in step S111, it is determined whether or not a condition for ending the work being executed is satisfied. If it is determined that the condition is not negative, the process proceeds to step S216. This work is finished and returns. If it is determined NO in step S111, the process returns to step S202, and the work being executed continues.

  According to the drive source switching control mode according to the present embodiment described above (FIGS. 8 to 10), in the hybrid work vehicle V, the hydraulic pump P that supplies hydraulic oil to the hydraulically operated work machines 2 and 7 is provided. Since the power of either the engine E or the electric motor M can be selectively driven based on the switching operation of the power changeover switches M-SW1 and M2, the hydraulic pump P drive source can be properly used depending on the work situation and environment. It is possible and convenient. For example, it is convenient that the hydraulic pump P can be driven by the electric motor M in a place such as a residential area where noise exhaust of the engine E is a problem, and the engine E can be driven in a place where the problem is not a problem.

  Further, the second control unit UK2 of the present embodiment determines that the battery B has run out of battery or an abnormality has occurred in the electrical system in the motor drive state of the hydraulic pump P shown in FIG. When the motor drive permission signal is no longer output from the vehicle-side control device UV even though the work implement operating signal is input, an emergency stop signal is output to the first control device UK1 side. In response to this, the first control unit UK1 issues a stop command signal to the multi-valve MV and simultaneously controls the operation to the neutral position, thereby urgently stopping the working machines 2 and 7 that are operating (step S202, 203). Similarly, when the starter switch S-SW of the engine E is erroneously input and the start operation of the engine E is performed while the hydraulic pump P is driven by the motor, the second control unit UK2 performs the first control on the emergency stop signal. In this case as well, the working machines 2 and 7 that are operating are urgently stopped (corresponding to steps S209 to 211).

  As described above, when the battery B runs out of the battery or the abnormality occurs in the electric system while the hydraulic pump P is in the motor drive state, the work machines 2 and 7 are stopped urgently. By not being able to drive, it is possible to prevent the work machines 2 and 7 from operating unexpectedly and reliably. Similarly, when the engine E is erroneously started while the hydraulic pump P is driven, the work machines 2 and 7 are stopped urgently. Therefore, even if the electric motor M is stopped due to the erroneous start operation of the engine E, It is possible to reliably and reliably prevent the work machines 2 and 7 from operating unexpectedly. In addition, after the emergency stop of the work machines 2 and 7, in addition to the switching operation (step S 204) for the power source selection switches M-SW 1 and 2, other predetermined restart operations (steps S 205 and 206), particularly The operation of the multi-valve M is controlled so that the emergency stop is not released until the on operation (step S206) for resuming work is performed on the operation switches CF-SW1 to 3 and CR-SW1 and 2 as work start switches. Specifically, since the second control unit UK2 continues to output an emergency stop signal), it is possible to more reliably prevent the work machines 2 and 7 that have been emergency stopped from being inadvertently restarted.

  Further, in the control devices UK2 and UV of this embodiment, the power source selection switch M-SW1, during the driving state, regardless of whether the hydraulic pump P is in the driving state of the engine driving state or the motor driving state. When 2 is switched, the operation input is invalidated (see steps S109 and S213), and the driving state before the switching operation can be maintained. Therefore, the work machines 2 and 7 are unexpected due to the switching of the driving state. It is possible to prevent the operation from occurring without fail.

  By the way, the above control mode is a technical idea that, when the work machines 2 and 7 are in the operation stop state, the switching control of the both driving states based on the switching operation input of the power source selection switches M-SW 1 and 2 is executed. Can also be captured. In this case, the operation stop state of the work machines 2 and 7 can be detected by, for example, the idle up signal not being output from the first control unit UK1 to the second control unit UK2, and the operation stop state is being detected. Otherwise, even if the power source selection switches M-SW1 and M2 are switched, a motor drive command signal is output from the second control unit UK2 to the vehicle-side control unit UV side or the output is stopped based on the switching operation. There is nothing to do. That is, even if the power source selection switches M-SW1 and M2 are switched while the work machines 2 and 7 are in operation, the drive state switching control is always performed with the work machines 2 and 7 stopped operating. It is possible to prevent the work machines 2 and 7 from unexpectedly operating due to the switching of the driving state.

  In the present embodiment, the work machines 2 and 7 are provided with switches CF-SW1 to 3 and CR-SW2 that function as work end switches for arbitrarily terminating the dust loading work or the dust discharge work. The operation of the work machines 2 and 7 must be temporarily stopped based on the operation input to the work end switch (that is, the process does not go through step S111 to step S112, or go through step S215 to step S216). Since the drive source switching control of the hydraulic pump P based on the switching operation input of the power source selection switches M-SW1 and M2 is not executed, it is possible to effectively prevent the drive source from being inadvertently switched.

  In the present embodiment, the dust discharge device 7 operates as long as the up / down selection switch CF-SW2 or the advance / retreat selection switch CF-SW3 is operated. For example, the dust discharge box 3 is moved from the loading position (lowering position). When the worker interrupts the operation of the up / down selection switch CF-SW2 while being rotated upward toward the discharge position (raised position), the dust box 3 is stopped at a position below the discharge position. In this case, although the operation of the work machine (dust discharge device 7) is temporarily stopped, the drive source switching control of the hydraulic pump P based on the switching operation input of the power source selection switches M-SW1 and 2 is performed. May be executable.

  Further, when the emergency stop switch CR-SW3 is operated and the work machines 2 and 7 are emergency stopped, the operation is temporarily stopped. Therefore, the hydraulic pump P based on the switching operation input of the power source selection switches M-SW1 and M2. The drive source switching control can be executed. When safety cannot be sufficiently ensured during an emergency stop or when safety is a top priority, the hydraulic pump P is driven based on the switching operation input of the power source selection switches M-SW 1 and 2 after the emergency stop. It may be set to prohibit the source switching control.

  By the way, in the said embodiment, when the power source selection switch M-SW1 and 2 are switched during the operation of the work machines 2 and 7, the operation input to the work end switches CF-SW1 to 3 and CR-SW2 is performed. Based on the switching operation (re-operation) of the power source selection switches M-SW 1 and 2 performed thereafter, the operation of the work machines 2 and 7 is temporarily stopped, and the drive source switching control of the hydraulic pump P is executed. However, instead of such a control mode, the drive source of the hydraulic pump P can be used without temporarily switching the power source selection switch M-SW 1 or 2 after the work machines 2 and 7 are temporarily stopped. Control that automatically executes the switching control can also be adopted. In this case, it is not necessary to re-operate the power source selection switches M-SW1 and M2, which is convenient and increases the work efficiency.

For example, if the power source selection switch M-SW1, 2 is switched during the operation of the dust loading device 2 during the dust loading cycle, the new switching operation position is stored in the control unit UK2. In addition, the currently loaded dust loading cycle is executed as it is until the end of the currently running cycle without switching the drive source, and the dust loading device 2 is temporarily stopped simultaneously with the end of the cycle. Then, the drive source switching control of the hydraulic pump P is executed based on the new switching operation position of the power source selection switch M-SW1, 2 stored previously, and during that time, voice guidance is given to the effect that the drive source is being switched. Alternatively, the information is visually notified on the guidance screen. When the drive source switching is completed in this way, if the previous dust loading process has been operated once, the worker restarts the dust loading process by turning on the loading switch CR-SW1. If the dust loading process is a continuous operation, the continuous operation of the dust loading process is resumed without turning on the loading switch CR-SW1. Even in the case of continuous operation, it may be set to resume the dust loading process by turning on the loading switch CR-SW1. In this case, the accident involving a sudden resumption of loading Can be prevented in advance.
[Power source selection switch signal invalidation flow]
The output signals from the first and second power source selection switches M-SW1 and M2 are selectively controlled to be valid / invalid depending on whether the work implement is being loaded or discharged. It is controlled by the control flow as exemplified in the above.

  First, in step S301, it is determined whether or not the main switch CF-SW1 is in the loading operation position or the off position. If not (that is, the dust discharge process is not selected), the process proceeds to step S302. Based on the main switch signal output from the main switch CF-SW1 to the second control unit UK2, the second control unit UK2 enables only the power source selection switch M-SW1 of the rear operation panel CR.

  On the other hand, if it is determined in step S301 that the result is NO (that is, the dust discharge process is selected), the process proceeds to step S303, and the main switch signal output from the main switch CF-SW1 to the second control unit UK2. The second control unit UK2 activates only the power source selection switch M-SW2 of the front operation panel CF.

As described above, when the dust loading operation is selected, the second control unit UK2 uses the switch based on the operation input to the power source selection switch M-SW1 provided on the operation panel CR on the dust box 3 side. Only when the motor selection signal output by is activated, and when the dust discharge work is selected, the same operation is performed based on the operation input to the power source selection switch M-SW 2 that can be operated at a position separated from the dust box 3. Since only the motor selection signal output by the switch is valid, for example, the power changeover switch M-SW2 is switched by another worker away from the dust box 3 in the selected state of the dust loading operation. However, the drive source is not changed and is maintained as it is, so that there is no possibility that the movement of the dust loading device 2 becomes an unexpected movement for the workers around the dust throwing box 3. On the other hand, in the selected state of the dust discharge operation, even if an operator around the dust input box 3 switches the power selector switch M-SW1 in the vicinity of the dust input box 3, the drive source is not changed and is maintained as it is. Therefore, there is no possibility that the movement of the dust discharge device 7 becomes an unexpected movement for another worker who operates the operation panel CF at a position away from the dust box 3.
[Flow of swash plate angle control of hydraulic pump]
The discharge capacity of the hydraulic pump P composed of a swash plate plunger pump (that is, the inclination angle of the swash plate) is controlled by switching whether or not a swash plate angle change signal is output from the second controller UK2 to the swash plate driving actuator A. This switching control is controlled by a control flow as exemplified in FIG.

  First, in step S401, it is determined whether or not the power source selection switches M-SW1 and M2-SW1 are turned on and the motor selection signal is effectively input to the second control unit UK2 side. ), The process proceeds to step S402. In this step S402, the second control unit UK2 does not output the swash plate angle change signal, so that the swash plate driving actuator A is placed in a non-excited state, and the discharge capacity of the hydraulic pump P is in the engine driving state. Is set to an optimum discharge capacity (for example, 63 cc / rev).

  If it is determined in step S401 that the answer is no (motor drive selection), the process proceeds to step S403. In this step S403, the second control unit UK2 outputs a swash plate angle change signal, and based on this signal, the swash plate driving actuator A is placed in an excited state. As a result, the discharge capacity of the hydraulic pump P is increased by the motor drive. The optimum discharge capacity in the state (for example, 80 cc / rev) is set. Thereby, in the motor drive state of the hydraulic pump P, it is necessary for driving the work machine by setting the hydraulic pump P to a relatively high discharge capacity even if the electric motor M is set to a low rotation (for example, 650 rpm) for noise countermeasures and the like. On the other hand, in the engine driving state of the hydraulic pump P, the hydraulic pump P can be set to a relatively low discharge capacity even if the engine E is rotated to a certain degree of high speed (for example, 825 rpm) in order to prevent engine stall. By setting, it becomes possible to effectively prevent the amount of discharged oil from becoming excessive.

The determination condition in step S401 is whether or not the power source selection switch M-SW1, 2 is turned on (motor drive selection) and the motor selection signal is effectively input to the second control unit UK2 side. In addition to the above, the determination conditions in steps S7 and S202 (whether or not the electric motor can be normally driven) may be added to narrow down the determination conditions in step S401.
[Notification control flow of notification means]
The notification operation of the first to fifth notification lamps L1 to L5 is controlled by a control flow as exemplified in FIG.

  First, in step S501, it is determined whether or not the power source selection switches M-SW1 and M2-SW1 are turned on (that is, motor drive selection). 5 The notification lamp L5 is turned on to notify that the power source selection switches M-SW1 and M2 are being turned on, and then the process proceeds to step S503. If NO in step S501, the process skips step S502 and proceeds to step S503.

  In step S503, it is determined whether or not the remaining amount of the battery B is sufficient (ie, exceeds a predetermined value). If it is determined that the battery B is sufficient, the process proceeds to step S504 and the fourth notification lamp L4 is turned on. It is lit to notify that the remaining amount is sufficient.

  Next, the process proceeds to step S505, and whether or not the electric system is normal (that is, the hydraulic pump P can be normally driven by the electric motor M in combination with the determination result of step S503 or step S509 described later). Whether or not) is determined. If not (NO) (ie, if the motor can be driven), the process proceeds to step S506 where the first notification lamp L1 is lit to drive the motor. The fact that it is in a possible state is notified, and then the process proceeds to step S507.

  In step S507, it is determined whether or not the power source selection switches M-SW1 and M2 are turned on (that is, motor drive selection), and the power source selection switches M-SW1 and M2 are turned on (that is, in combination with the determination results in steps S503 and 505). If it is determined that the hydraulic pump P is driving the motor), the process proceeds to step S508 to turn on the third notification lamp L3 to notify that the motor is being driven and return.

  If it is determined in step S503 that the battery B is not sufficient (ie, the remaining amount of the battery B has dropped below a predetermined value), the process proceeds to step S509, where the battery B is out of battery (that is, from the predetermined value). It is also determined whether or not the value has fallen below a lower predetermined lower limit. In this step S509, the battery has not run out (that is, the remaining battery level tends to decrease, but the minimum necessary to drive the motor, for example, the extent that the dust loading cycle can be executed once to several times (that is, the predetermined amount) If it is determined that (the lower limit value or more) is secured), the process proceeds to step S510 to turn on the second notification lamp L2 to notify that the remaining amount is low, and then to step S505. Proceed to On the other hand, if it is determined in step S509 that the battery B has run out and the remaining amount is less than the predetermined lower limit, a return is returned.

  Thus, according to the first notification lamp L1, since it is possible to notify that the hydraulic pump P is in a motor drivable state that can be normally driven by the electric motor M, the power changeover switch M-SW1, 2 is used to indicate the hydraulic pump P. When switching the drive source, it is possible to confirm in advance whether or not the electric motor M is in a state where the pump can be driven normally (that is, whether the electric system is normal and the battery B is not dead). Thus, it is possible to appropriately determine the drive source switching based on the confirmation result. In contrast to the first notification lamp L1, if a separate notification means such as a notification lamp for notifying that the hydraulic pump P is not in a motor drivable state that can be normally driven by the electric motor M is provided, It is possible to more reliably alert the work machines 2 and 7 that the motors cannot be driven.

  Further, according to the second notification lamp L2, it is possible to notify that the remaining amount of the battery B has decreased to a predetermined value or less (however, as described above, the battery is not exhausted and the necessary remaining amount is secured). Thus, it is possible to confirm the tendency of the remaining amount of the battery B to decrease early, and it is possible to prompt the operator to switch from the motor drive state to the engine drive state and to suppress the switch from the engine drive state to the motor drive state. The predetermined lower limit value used in step S509 is a small remaining amount value that is relatively close to the state of running out of battery as the remaining amount of the battery B, so that the motor does not proceed from step S510 to step S505, but returns immediately. It may be in a state incapable of driving (motor drive switching is also impossible).

  Further, according to the third notification lamp L3, when it is determined that the motor can be driven and the power source selection switches M-SW1 and M2 are in the ON operation (motor drive selection) position, the motor drive state is indicated. Therefore, it is possible to confirm whether or not the hydraulic pump P is being driven by the motor, and the drive source switching determination can be made more appropriately.

  Further, according to the fourth notification lamp L4, it can be confirmed that the remaining amount of the battery B is equal to or greater than a predetermined value and there is a sufficient margin for driving the motor, so that the drive source switching determination can be made more appropriately. In the illustrated example, the battery remaining amount threshold value (the operation condition of the second notification lamp L2) is set to be higher than the battery remaining amount threshold value (that is, the predetermined value used in step S503), which is the operating condition of the fourth notification lamp L4. That is, although the predetermined lower limit value used in step S509 is set low, both threshold values may be set to be the same.

  By the way, in general automobiles, the battery is charged even during normal idling operation of the engine to ensure the remaining amount of the battery, while in hybrid vehicles in particular, the battery is charged so that regenerative energy can be charged to the battery during regenerative braking. It is considered desirable to secure a necessary minimum free capacity, and when the remaining amount of the battery rises to a predetermined charging limit, charging control is performed so that charging by idling operation is not performed any more. However, the fourth notification lamp L4 of the present embodiment merely notifies that the remaining amount of the battery B is greater than or equal to a predetermined value, and whether or not the remaining amount of the battery exceeds the predetermined value and has reached the charging limit. Is not clear. Therefore, if a separate notification means such as a notification lamp for notifying that the remaining amount of the battery has reached the charging limit is provided, it is not necessary for the driver to continue the idling operation of the engine and charge the battery. It is possible to provide information to that effect and avoid unnecessary idling.

  Further, according to the fifth notification lamp L5, it is possible to clearly check whether or not the power source selection switches M-SW1 and M2 are in the ON operation (motor drive selection) position, so that the drive source switching determination is more appropriate. This is particularly advantageous in the case where the power source selection switches M-SW1 and M2-SW1 and 2 have a switch configuration in which the operation position is difficult to understand like a push button switch.

  The first to fifth notification lamps L1 to L5 satisfy the above-described operating conditions of the respective notification lamps, and the key switch of the vehicle V is turned on (that is, each control unit UK, UV is activated). State). Therefore, while the key switch of the vehicle is turned on (and therefore during driving of the vehicle), the notification operation by the notification lamps L1 to L5 can be always performed.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the first embodiment shown in FIG. 4, the second control unit UK2 is configured such that when a dust loading operation is selected by an operation input to the main switch CF-SW1, the power source selection switch on the dust input box 3 side is selected. Only the motor selection signal output by the switch based on the operation input to the M-SW 1 is valid, and when the dust discharge operation is selected, the power of the operation panel CF that can be operated at a position away from the dust box 3 Although only the motor selection signal output from the switch based on the operation input to the source selection switch M-SW2 is configured to be valid, in the second embodiment, the second control unit UK2 When the power source selection switch M-SW1 is switched, a loading permission signal for permitting only the dust loading operation is output to the first control unit UK1, and the operation which can be operated at a position away from the dust box 3 When source selection switch M-SW2 is switched operation is configured to output a discharge permission signal for permitting only the dust discharge work first controller UK1.

  In addition, an engine operating signal indicating that the engine E is operating, an engine start signal indicating that the starter switch S-SW has been operated, and a battery remaining signal indicating the remaining amount of the battery B are the vehicle Sensors provided to the engine E, the starter switch S-SW, and the battery B, respectively, as in the first embodiment, so as to be input from the side control unit UV to the second control unit UK2 of the bodywork side control unit UK Is not required to be connected to the second control unit UK2. In the second embodiment, the same signal input form as in the first embodiment can be used. In the first embodiment, the same signal input form as in the second embodiment can be used. It is possible.

  Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  When the power source selection switch M-SW1 on the dust input box 3 side is switched as in this embodiment, only the dust loading operation is permitted, the dust discharge operation is not permitted, and from the dust input box 3 When the power source selection switch M-SW2 that can be operated at a separated position is switched, if only dust discharge work is permitted and dust loading work is not permitted, steps S301 to 303 in FIG. The same effect as the control example described can be achieved.

  Next, a third embodiment of the present invention will be described with reference to FIG. In the previous embodiment, the variable displacement pump was used as the hydraulic pump P. In the third embodiment, the discharge amount per unit time is constant in the predetermined pump rotation speed region regardless of the pump rotation speed. A hydraulic pump of the type having so-called constant flow characteristics is used. Since this type of hydraulic pump is conventionally known, a specific pump structure is omitted, but in this embodiment, for example, as shown in FIG. 15, the pump rotation speed is from zero to a predetermined value (for example, 650 rpm). A constant flow characteristic in which the discharge oil amount per unit time gradually increases as the pump rotation speed increases and the discharge oil volume becomes constant (for example, 52 L / min) after the pump rotation speed reaches the predetermined value or more. A hydraulic pump is used. In this case, the pump rotational speed of the hydraulic pump P is set to a relatively low rotational speed (for example, 650 rpm) when the motor is driven within the predetermined pump rotational speed region where the discharge oil amount is constant (for example, 52 L / min). If the pump speed in the engine driving state is set to be relatively high (for example, 825 rpm), the discharge capacity (for example, 80 cc / rev) of the hydraulic pump P in the motor driving state is set in the engine driving state. Since the discharge capacity (for example, 63 cc / rev) can be set higher, the same effect as in the first embodiment can be obtained.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment, Various embodiment is possible within the scope of the present invention.

  For example, in the above-described embodiment, a so-called compression plate type garbage collection vehicle is exemplified as the work vehicle. However, in the present invention, the soot loading device 2 is a so-called rotation plate type dust loading device by cooperation of the rotation plate and the pushing plate. Alternatively, the dust discharge device 7 may be a so-called dump-type dust discharge device that tilts the dust storage box 1. In the present invention, the work vehicle is not limited to a garbage truck, and other various work vehicles that drive the work machine with a hydraulic pump, such as a concrete mixer truck, a concrete pump truck, a container transporter with a container loading / unloading function, The present invention can be applied to work vehicles such as an automobile wholesale transport vehicle with an automobile loading / unloading function.

  Moreover, in the said embodiment, although what was implemented in the hybrid vehicle which enabled the motive power of the electric motor M not only to drive a hydraulic pump but to drive a wheel was shown, in this invention, the motive power of the electric motor is shown. You may make it use only for the drive of a hydraulic pump. In this case, an electric motor dedicated to driving the pump, a battery that supplies electric power to the electric motor, an engine that is configured separately and independently from a traveling engine that applies driving force to the wheels, and is used only for driving a hydraulic pump, An embodiment in which a power selection / extraction mechanism capable of selectively extracting the power of the engine or the electric motor is mounted on the bodywork K can also be adopted. In this embodiment, the vehicle in the first to third embodiments is applicable. The function of the engine / motor control unit of the side control unit UV may be configured so that the body control unit UK, particularly the second control unit UK2, is responsible for the control of the engine / motor on the body UK side.

  In the embodiment, each power source selection switch M-SW1, 2 has a motor drive selection position (on operation position in the embodiment) and an engine drive selection position (off operation position in the embodiment). In the present invention, both the selection positions can be alternately selected by one switch. However, in the present invention, any power source selection switch M-SW1, 2 can be switched before the operation. The driving state (for example, engine driving state) of the hydraulic pump may be switched to another driving state (for example, motor driving state). Further, only the power source selection switch that has performed the drive source selection operation of the hydraulic pump (for example, the ON operation for selecting the motor drive) last time among the plurality of power source selection switches M-SW1, 2 is the next drive source. You may comprise so that switching operation (for example, OFF operation for selecting engine drive) can be performed.

  In the above embodiment, the motor drive state is selected by turning on the power source selection switches M-SW1 and M2, and the engine drive state is selected by turning off the power source selection switch M-SW1, but the power source selection switch M-SW1 is selected. , 2 output signals may be output so that the two drive sources (motor / engine) can be distinguished and selected. For example, the engine drive is selected by the on operation and the motor drive is selected by the off operation. You may comprise.

  In the above embodiment, the power source selection switches M-SW1 and M2 are dedicated to switching the drive source of the hydraulic pump. However, in the present invention, the existing operation switch is also used as the power source selection switch. Also good. For example, when the main switch CF-SW1 is also used as a power source selection switch, the main switch CF-SW1 is automatically returned from the loading position or the discharge position to the off position side. After selecting the position or discharge position, the drive source is switched when the same operation position is operated again, the drive source is further switched when the same operation position is operated again, and the drive source is further switched when operating again at the same operation position. You may enable it to perform alternate switching operation in the procedure of switching.

  In the above embodiment, the engine speed is set to be larger than the motor speed in the driving state of the hydraulic pump P in order to suppress noise during work, but depending on the purpose of use, environment, etc. For other reasons, the engine speed may be set smaller than the motor speed.

B ... Battery E ... Engine F ... Body K ... Bodywork M ... Electric motor M- SW1 ... First power source selection switch M-SW2 ... Second power source selection switch P ... Hydraulic pump PS ... Power selection take-out mechanism UK2 ...・ Second control device (control device)
V ····· Garbage truck (work vehicle)
W ... ・ Rear wheel (wheel)
2 ..... Dust loading device (work machine)
7 .... Dust discharge device (work machine)

Claims (3)

A bodywork mounted on the vehicle body (F) of the work vehicle (V),
A hydraulic pump (P) that can be driven by either the engine (E) or an electric motor (M) that is operated by electric power from the battery (B), and a hydraulically operated type that is operated by the oil discharged from the hydraulic pump (P) , A power selection / extraction mechanism (PS) that can selectively extract power from the engine (E) and the electric motor (M) and transmit it to the hydraulic pump (P), and the engine (E ), Switching between an engine driving state in which the hydraulic pump (P) is driven by the engine (E) and a motor driving state in which the electric motor (M) is driven by controlling the electric motor (M) and the power selection / removal mechanism (PS) At least a possible control device (UK2) and a power source selection switch (M-SW1, 2) connected to the control device (UK2) for arbitrarily switching between the two drive states,
The hydraulic pump (P) is constituted by a discharge capacity variable type hydraulic pump, and is connected to the control device (UK2), and the discharge capacity can be changed and controlled by the control device (UK2).
The control device (UK2) switches and controls the discharge capacity of the hydraulic pump (P) in the engine drive state and the discharge capacity in the motor drive state according to the drive state. Vehicle bodywork.   The construction of the work vehicle according to claim 1, wherein the control device (UK2) sets the discharge capacity in the motor driving state to be larger than the discharge capacity in the engine driving state. object. A bodywork mounted on the vehicle body (F) of the work vehicle (V),
A hydraulic pump (P) that can be driven by either the engine (E) or an electric motor (M) that is operated by electric power from the battery (B), and a hydraulically operated type that is operated by the oil discharged from the hydraulic pump (P) , A power selection / extraction mechanism (PS) that can selectively extract power from the engine (E) and the electric motor (M) and transmit it to the hydraulic pump (P), and the engine (E ), Switching between an engine driving state in which the hydraulic pump (P) is driven by the engine (E) and a motor driving state in which the electric motor (M) is driven by controlling the electric motor (M) and the power selection / removal mechanism (PS) At least a possible control device (UK2) and a power source selection switch (M-SW1, 2) connected to the control device (UK2) for arbitrarily switching between the two drive states,
The hydraulic pump (P) is composed of a hydraulic pump having a characteristic that a discharge oil amount per unit time is constant in a predetermined pump rotation speed region,
The controller (UK2) sets the pump rotation speed of the hydraulic pump (P) so that the pump rotation speed in the engine driving state and the pump rotation speed in the motor driving state are both within the predetermined pump rotation speed region. There is also provided a work vehicle bodywork that is controlled so that a pump rotation speed in the engine driving state is higher than a pump rotation speed in the motor driving state.

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