JP2011190009A - Generator drive control device of on-vehicle crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To drive a hydraulic pump having a capacity equivalent to a crane without a mechanism for driving a generator under an equivalent engine load, in an on-vehicle crane with a mechanism in which the generator is driven by an engine. <P>SOLUTION: A generator drive control device includes: the hydraulic pump 7 driven by the engine 6; a direction control valve 37 for changing an oil passage of pressure oil delivered from the hydraulic pump 7; flow rate control valves 40-43 for controlling the flow rate of the pressure oil delivered from the direction control valve 37; a hydraulic motor 38 for driving the generator driven by the pressure oil delivered from the direction control valve 37; and a controller 2 for controlling the direction control valve 37 based on an operation signal to the crane. The controller 2 changes the direction control valve 37 so as to supply the pressure oil only to the flow rate control valves 40-43 when the operation signal is input and so as to supply the pressure oil only to the hydraulic motor 38 when the operation signal is absent. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle-mounted crane having a hydraulic pump driven by a vehicle engine and operated by pressure oil from the hydraulic pump, and more particularly, a vehicle-mounted crane provided with a mechanism for driving a generator by the engine. This invention relates to the generator drive control device.

  For example, as shown in FIG. 9, this type of vehicle-mounted crane includes a hydraulic pump 7 that is driven by an engine 6 of the vehicle. The hydraulic pump 7 is operated via a PTO (power take-off) 6 a connected to the engine 6. The pressure oil discharged from the hydraulic pump 7 is supplied to the control valve 3. The control valve 3 has a flow control valve for operating a plurality of actuators of the crane body C, and based on a control signal from the controller 2 in accordance with an operation signal from the operation input device 1, The oil passage is switched, and each actuator of the crane body C is operated.

Incidentally, the engine torque characteristic of a truck or the like on which this type of vehicle-mounted crane is mounted usually increases as the engine speed increases. Therefore, there is a margin in engine torque compared to the discharge amount of the hydraulic pump. Therefore, a technique for effectively using such surplus power has been proposed (see, for example, Patent Document 1).
For example, in the technique described in Patent Document 1, for example, as shown in FIG. 8, a hydraulic pump 7 for operating a crane that is driven by an engine 6, and a generator 39 that is connected to the engine 6 so as to be able to always generate power at its output. It has. According to the technique described in this document, it is possible to drive the hydraulic pump 7 with the engine 6 to perform crane work and drive the generator 39 to effectively use surplus power.

Utility Model Registration No. 3134673

  However, in the technique described in Patent Document 1, since the hydraulic pump and the generator are always driven when the crane is operated, the crane is not equipped with a mechanism for driving the generator. There is a problem that the maximum load of the engine becomes large. In order to make the maximum engine load equal to that of a crane not equipped with a mechanism for driving a generator, the capacity of the hydraulic pump must be reduced. In this case, the operating speed of the crane is slow. There is a problem of becoming.

  Therefore, the present invention has been made paying attention to such problems, and in a vehicle-mounted crane having a mechanism for driving a generator by an engine, a crane not having a mechanism for driving a generator, It is an object of the present invention to provide a generator drive control device for a vehicle-mounted crane that can drive a hydraulic pump of the same capacity with an equivalent engine load.

  In order to solve the above problems, the present invention is configured such that the drive of the generator can be stopped according to the operation state of the crane, the drive of the generator is stopped when the crane is operated, and the generator is driven only when the crane is not operated. Is. The crane operation can be detected by an operation signal from the operation input device, a position detector attached to the spool of the flow control valve, a limit switch, or the like.

  That is, the first aspect of the present invention is a hydraulic pump driven by an engine, a directional control valve for switching an oil passage of pressure oil discharged from the hydraulic pump, and a pressure oil discharged from the directional control valve. A flow control valve for controlling the flow rate of the generator, a hydraulic motor for driving a generator driven by pressure oil discharged from the direction control valve, and a controller capable of controlling the direction control valve based on an operation state of a crane; A generator drive control device for a vehicle-mounted crane, wherein the controller switches the direction control valve to supply pressure oil only to the flow control valve when crane operation is detected, When no crane operation is detected, the directional control valve is switched so as to supply pressure oil only to the hydraulic motor for driving the generator.

  According to the generator drive control device for a vehicle-mounted crane according to the first aspect, the generator is driven by a hydraulic motor, and the controller uses a direction control valve to connect the oil passage of the pressure oil supplied from the hydraulic pump. Switching is performed so that only the flow control valve for the crane is switched when the crane is operated, and only the hydraulic motor for driving the generator is switched when the crane is not operated. Energy can be used effectively by driving the generator with power. Since the generator is stopped during crane operation and only the power load for crane operation is used, a pump with the same capacity as a crane without a mechanism for driving the generator is driven with the same engine load. can do.

  The second aspect of the present invention is a hydraulic pump driven by an engine, a flow rate control valve for controlling the flow rate of pressure oil discharged from the hydraulic pump, and a generator controlled by the flow rate control valve. A generator drive control device for a crane mounted on a vehicle, comprising: a drive hydraulic motor; and a controller capable of controlling the flow control valve based on an operation state of the crane, wherein the controller includes a flow rate of the flow control valve. When the crane operation is detected, the supply of pressure oil to the generator driving hydraulic motor is stopped, and when the crane operation is not detected, the generator driving hydraulic pressure is stopped. It is characterized by supplying pressure oil only to the motor.

  According to the generator drive control device for a crane mounted on a vehicle according to the second aspect, the generator is driven by a hydraulic motor, and the crane is operated using a flow control valve to the hydraulic motor for driving the generator. Stops the supply of pressure oil to the hydraulic motor for driving the generator, and controls the flow rate control valve so as to supply pressure oil only to the hydraulic motor for driving the generator when the crane is not operated. Similarly to the above, when the crane is not operated, the generator can be driven by surplus power of the engine, so that energy can be effectively used. When the crane is operated, the drive of the generator is stopped and only the power load for the crane operation is used, so that a pump having the same capacity as that of the crane not having a mechanism for driving the generator can be obtained with the same engine load. Can be driven.

  The third aspect of the present invention includes a hydraulic pump driven by an engine, a generator driven by the engine, a clutch mechanism for intermittently driving power to the generator, and an operation state of the crane. And a controller for controlling on / off of the clutch mechanism based on a generator drive control device for a crane mounted on a vehicle, wherein the controller disconnects the clutch mechanism when crane operation is detected. When the driving force to the generator is cut off and only the hydraulic pump is driven and crane operation is not detected, the clutch mechanism is connected to connect the driving force to the generator and the hydraulic pump It is characterized by driving both generators.

  According to the generator drive control device for a crane mounted on a vehicle according to the third aspect, the generator is driven by the engine of the vehicle, and the generator is connected via a clutch mechanism that intermittently drives the generator. And the controller cuts off the driving force to the generator when the crane is operating, and connects the driving force to the generator only when the crane is not operating. The energy can be used effectively by driving the generator. When the crane is operated, the drive of the generator is stopped and only the power load for the crane operation is used, so that a pump having the same capacity as that of the crane not having a mechanism for driving the generator can be obtained with the same engine load. Can be driven.

  As described above, according to the present invention, in a vehicle-mounted crane equipped with a mechanism for driving a generator by an engine, energy is effectively used by driving the generator with surplus power of the engine when the crane is not operated. can do. Since the generator can be stopped during crane operation and only the power load for crane operation can be used, a pump with the same capacity as a crane that does not have a mechanism for driving the generator can be used. Can be driven by.

It is a figure explaining one embodiment of a crane concerning the present invention. It is a block diagram of the control apparatus which concerns on 1st Embodiment of this invention. It is a flowchart of the generator drive control process which concerns on 1st Embodiment of this invention. It is a block diagram of the control apparatus which concerns on 2nd Embodiment of this invention. It is a flowchart of the generator drive control process which concerns on 2nd Embodiment of this invention. It is a block diagram of the control apparatus which concerns on 3rd Embodiment of this invention. It is a flowchart of the generator drive control process which concerns on 3rd Embodiment of this invention. It is an example of the block diagram of the conventional control apparatus of the crane for vehicle mounting provided with the mechanism which drives a generator with an engine. It is a block diagram of the conventional control apparatus.

  Hereinafter, an embodiment of a generator drive control device for a vehicle-mounted crane according to the present invention will be described with reference to the drawings as appropriate. FIG. 1 is a diagram for explaining an embodiment of a crane provided with a generator drive control device for a vehicle-mounted crane according to the present invention. FIG. 1 is a side view of the crane (including a vehicle). Show. FIG. 2 is a diagram illustrating a first embodiment of a generator drive control device (hereinafter also simply referred to as “control device”) for a vehicle-mounted crane according to the present invention.

  As shown in FIG. 1, the vehicle-mounted crane C has a base 15 connected and fixed on a chassis frame 14 between a loading platform 12 and a cab 13 of the vehicle 10. A column 16 is turnably provided on the base 15, and a boom 17, which is a multistage telescopic boom, is pivotally supported at the upper end of the column 16 so as to be raised and lowered. The column 16 is provided with a winch (not shown). A wire rope 18 is led from the winch to the tip of the boom 17 and hooked via a pulley (not shown) at the tip of the boom 17. The hook 11 is suspended from the tip end portion of the boom 17 by being hung around 11.

  As shown in FIG. 2, the control device for the crane C includes a main hydraulic pump 7 driven by the engine 6 of the vehicle 10 and a sub hydraulic pump 8 driven by the electric motor 36. The main hydraulic pump 7 uses the engine 6 of the vehicle 10 as a power source and operates via a PTO (power take-off) 6 a connected to the engine 6 of the vehicle 10. Further, the pressure oil discharged from the main hydraulic pump 7 is supplied to the main pipeline 27. Here, a directional control valve 37 is interposed in the main pipe line 27, and a control valve 3 and a generator driving hydraulic motor 38 are connected to the secondary side thereof. A generator 39 that can be driven thereby is connected to the hydraulic motor 38. The return pipe 29 of the control valve 3 is connected to the tank 9.

  Furthermore, a battery 62 is connected to the generator 39 via a power controller 61, and the battery 62 is charged by driving the generator 39. In addition, a motor controller 63 is connected to the power supply controller 61, and the motor controller 63 is connected to the controller 2 via a signal line 54, and the electric motor according to a motor control signal from the controller 2. 36 is driven. When the electric motor 36 is driven, the auxiliary hydraulic pump 8 is driven accordingly.

  The discharge side of the auxiliary hydraulic pump 8 is connected to the main conduit 27 on the control valve 3 side with respect to the direction control valve 37 and the check valve 66 via the check valve 65, and the pressure discharged from the main hydraulic pump 7. The pressure oil of the auxiliary hydraulic pump 8 is joined to the oil and supplied to the control valve 3. Here, the control valve 3 is a stack type control valve in which flow control valves 40 to 43 for supplying and discharging pressure oil necessary for driving the hydraulic actuators 30 to 33 for driving the crane are stacked. is there.

  Specifically, as shown in the figure, each of the flow control valves 40 to 43 is connected to the controller 2 via a signal line 53, and the oil passage is based on a control signal from the controller 2 according to the operation signal. The switching operation is executed. The flow control valves 40 to 43 are provided with operation detectors 46 for detecting the operation contents of the flow control valves 40 to 43, respectively. These operation detectors are connected to the controller 2 via the signal line 53, and signals of the operation contents of the flow control valves 40 to 43 detected by the operation detectors are input to the controller 2. Is done. For example, a microswitch or a differential transformer is used for the operation detector 46 of each flow control valve 40 to 43.

  The turning hydraulic motor 33 is connected to a turning flow control valve 43 capable of supplying and discharging the pressure oil necessary for driving, and the column 16 of the crane C is turned left and right by the turning hydraulic motor 33. It is possible. The boom expansion / contraction hydraulic cylinder 32 is connected to a boom expansion / contraction flow control valve 42 that can supply and discharge pressure oil necessary for driving the boom. The boom raising / lowering hydraulic cylinder 30 further includes pressure oil required for driving the boom expansion / contraction hydraulic cylinder 32. Is connected to a boom raising and lowering flow control valve 40 capable of supplying and discharging. As a result, the boom 17 of the crane C is expanded and contracted by the expansion and contraction of the boom expansion and contraction hydraulic cylinder 32, and is raised and lowered by the boom raising and lowering hydraulic cylinder 30. The winch hydraulic motor 31 is connected to a winch flow control valve 41 capable of supplying and discharging pressure oil necessary for driving the winch, and the hook 11 of the crane C is operated by a winch by the winch hydraulic motor 31. That is, the hoisting / lowering operation is performed.

Further, as shown in FIG. 2, the control device of the crane C has an operation input device 1 for an operator to input a desired operation input. The operation input device 1 is operated by an operator. An operation signal corresponding to the above can be output to the controller 2 via the signal line 50.
The control device further includes an accelerator cylinder 4 and a governor 20, and the accelerator cylinder 4 and the governor 20 are connected to each other by a link 21. The accelerator cylinder 4 is also connected to the controller 2 via a signal line 51 and is driven based on a control signal from the controller 2. Further, according to the operation of the accelerator cylinder 4. Thus, by adjusting the fuel injection amount to the engine 6 by the governor 20, the engine speed can be controlled to a desired speed. That is, this control device is configured to be able to individually control the rotational speed of the engine 6 and the predetermined flow rate of the pressure oil by the flow rate control valve 5.

  Here, the directional control valve 37 is also connected to the controller 2 via the signal line 52, and the directional control valve 37 switches the oil path based on a control signal (power generation switching control signal) from the controller 2. Made. As a result, the pressure oil discharged from the main hydraulic pump 7 can be switched to either the control valve 3 side or the generator driving hydraulic motor 38 side. The controller 2 executes a predetermined generator drive control process in order to drive a pump having the same capacity as a crane not having a mechanism for driving the generator 39 with the same engine load. .

  Specifically, the controller 2 includes a CPU for controlling the operation of the generator drive control process and the entire system of the control device based on a predetermined control program (both not shown) and a CPU in a predetermined area in advance. ROM for storing the control program and the like, RAM for storing the data read from the ROM and the like and the calculation results necessary in the calculation process of the CPU, the operation input device 1, the control valve 3, and the accelerator cylinder 4 described above , And an I / F (interface) that mediates input / output of data to / from external devices including the direction control valve 37 and the like.

  Then, the I / F of the controller 2 is mutually connected with operation signals or control signals by signal lines (reference numerals 50 to 54 indicated by broken lines in FIG. 2) such as a bus for transferring data to the respective external devices. Thus, the control signal corresponding to the operation signal input from the operation input device 1 can be output to the control valve 3, the accelerator cylinder 4, and the direction control valve 37, respectively. It has become.

Hereinafter, the generator drive control process executed by the controller 2 will be described. FIG. 3 is a flowchart of a program for executing the generator drive control process executed by the controller 2.
In this controller 2, the stroke of the accelerator cylinder 4 is controlled according to the ratio of the operation signal input from the operation input device 1, and the motor controller 63 is controlled so that the pressure oil from the main hydraulic pump 7 is supplied to the pressure oil from the sub hydraulic pump 8. The pressure oil supply amount control for merging the generators is executed, and at the same time, the generator drive control process is executed.

  When the generator drive control processing program is executed in the controller 2, as shown in FIG. 3, the operation proceeds to step S1, and the operation state of the crane is monitored and the operation signal from the operation input device 1 is monitored. Detect with. That is, it is determined whether any one of the operation inputs to the crane is input to the controller 2 from the operation input device 1, and it is determined that any one of the operation signals is input. If (Yes), the process proceeds to step S2, and if not, that is, if it is determined that the operation signal is not input (No), the process proceeds to step S3. In step S2, the directional control valve 37 is switched to the control valve 3 side, that is, the required pressure oil is supplied only to the flow control valves 40 to 43, and the process is returned. On the other hand, in step S3, the direction control valve 37 is switched to the hydraulic motor 38 side, pressure oil is supplied only to the hydraulic motor 38 for driving the generator, and the process is returned.

Next, the function and effect of the generator drive control device for the vehicle-mounted crane will be described.
As described above, the generator drive control device for the vehicle-mounted crane is a directional control valve that switches the pressure oil from the main hydraulic pump 7 in two directions: the control valve 3 side and the generator drive hydraulic motor 38 side. 37, the controller 2 supplies pressure oil only to the control valve 3 side when the operation signal from the operation input device 1 is input, and hydraulic pressure when the operation signal is not input. Since the directional control valve 37 is switched so as to supply the pressure oil only to the motor 38 side, according to the generator drive control device of this vehicle-mounted crane, the generator 39 is driven by the surplus power of the engine 6 when the crane is not operated. By driving, energy can be used effectively. And the torque load of 6 to an engine can be suppressed by stopping the drive of the generator 39 at the time of crane operation, and setting it as only the power load for crane operation. Therefore, a pump (main hydraulic pump 7) having a capacity equivalent to that of a crane not having a mechanism for driving the generator 39 can be driven with an equivalent engine load. That is, according to the generator drive control device for a crane mounted on a vehicle, surplus power when the crane is not operated can be used without wasting, and the generator is used in combination without increasing the load on the engine. be able to.

The generator drive control device for a vehicle-mounted crane according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the directional control valve 37 that switches the pressure oil from the main hydraulic pump 7 in two directions on the control valve 3 side and the hydraulic motor 38 side for driving the generator is provided. It is connected to the controller 2 via a signal line 52, and an oil path switching operation is executed based on a control signal from the controller 2, and pressure oil discharged from the main hydraulic pump 7 is supplied to the control valve 3 side or hydraulic pressure. The example of switching to one of the motors 38 has been described. However, the present invention is not limited to this, and the present invention is configured such that the drive of the generator can be stopped according to the operation state of the crane, and the generator is driven during crane operation. Various configurations can be adopted as long as the generator is driven only when the crane is not operated. Hereinafter, other embodiments will be described.

  4 and 5 show a second embodiment. In the second embodiment, a flow control valve for driving a generator is added to the control valve 3 instead of the direction control valve 37 with respect to the first embodiment, and the generator is driven by the added flow control valve. This is an example of controlling a hydraulic motor for use. In addition, the same code | symbol is attached | subjected about the structure similar to the said 1st Embodiment, and the description is abbreviate | omitted suitably.

  Specifically, as shown in FIG. 4, in the second embodiment, a generator drive flow control valve 44 is added to the control valve 3. A generator-driven hydraulic motor 38 is connected to the secondary side of the flow control valve 44, and a generator 39 is connected to the hydraulic motor 38 so as to be driven thereby. The following is the same as in the first embodiment. That is, the battery 62 is connected to the generator 39 via the power controller 61, and the battery 62 is charged by driving the generator 39. A motor controller 63 is connected to the power supply controller 61, and the motor controller 63 drives the electric motor 36 in accordance with a motor control signal from the controller 2. When the electric motor 36 is driven, the auxiliary hydraulic pump 8 is driven accordingly.

In the second embodiment, the controller 2 stops the supply of pressure oil to the hydraulic motor 38 when the crane operation is detected, and only the hydraulic motor 38 when the crane operation is not detected. The flow rate of the flow rate control valve 44 is controlled so as to supply pressure oil.
That is, as shown in FIG. 5, when the generator drive control processing program is executed in the controller 2, the process proceeds to step S <b> 1, and the operation state of the crane is monitored as in the first embodiment. If it is determined that at least one operation signal has been input (Yes), the process proceeds to step S2, and if not, the process proceeds to step S3. In step S2, the added flow control valve 44 is controlled to stop the supply of the pressure oil to the hydraulic motor 38 for driving the generator, that is, the pressure is applied only to the flow control valves 40 to 43 to which the operation signal is input. Supply oil and return to process. On the other hand, in step S3, pressure oil is supplied only to the hydraulic motor 38 and the process is returned.

  In such a configuration, a flow control valve 44 is stacked in series for generator control, the generator 39 is driven by a hydraulic motor 38, and a flow control valve 44 dedicated to the hydraulic motor 38 is used. When the crane is operated, the supply of the pressure oil to the hydraulic motor 38 is stopped, and when the crane is not operated, the control is performed so that the pressure oil is supplied only to the generator driving hydraulic motor. Therefore, as in the first embodiment, When the crane is not operated, the generator 39 is driven by surplus power of the engine 6 so that energy can be used effectively. When the crane is operated, the generator 39 is stopped and only the power load for the crane operation is used, so that a pump having a capacity equivalent to that of a crane not having a mechanism for driving the generator is equivalent to the engine load. Can be driven by.

  Next, FIGS. 6 and 7 show a third embodiment. The third embodiment has a configuration in which a generator 39 is connected to the main hydraulic pump 7 via a clutch mechanism 70 in place of the direction control valve 37 as compared with the first embodiment. In this example, the hydraulic motor 38 for driving the generator is controlled by intermittently connecting the clutch mechanism 70. That is, when the crane operation is detected, the controller 2 disconnects the clutch mechanism 70 to cut off the driving force to the generator 39 and drives only the main hydraulic pump 7, and the crane operation is not detected. When the clutch mechanism 70 is connected, the driving force to the generator 39 is connected to drive both the main hydraulic pump 7 and the generator 39.

  Specifically, as shown in FIG. 7, when the generator drive control processing program is executed in the controller 2, the process proceeds to step S <b> 1, and the operation state of the crane is monitored as in the first embodiment, When it is determined that any one of the operation signals is input (Yes), the process proceeds to step S2, and otherwise, the process proceeds to step S3. In step S2, the clutch mechanism 70 is controlled, the driving force to the generator 39 is interrupted, and only the main hydraulic pump 7 is driven to return the process. On the other hand, in step S3, the clutch mechanism 70 is connected, the driving force to the generator 39 is connected, both the main hydraulic pump 7 and the generator 39 are driven, and the process is returned.

With such a configuration, the generator 39 is driven by the engine 6 of the vehicle, and the generator 39 is attached via the clutch mechanism 70 for intermittently driving the generator 39. The controller 2 The clutch mechanism 70 is controlled so that the driving force to the generator 39 is cut off when the crane is operated and the driving force to the generator 39 is connected only when the crane is not operated. When not operated, the generator 39 is driven by surplus power of the engine 6 so that energy can be effectively used. When the crane is operated, the drive of the generator 39 is stopped and only the power load for the crane operation is used, so that a pump having a capacity equivalent to that of a crane not having a mechanism for driving the generator 39 is equivalent to the engine load. Can be driven by.
The battery 62 described in each of the above embodiments has been described as a dedicated battery provided for the generator drive control device of the crane for mounting on a vehicle according to the present invention. It is also possible to use the same battery.

1 Operation Input Device 2 Controller 3 Control Valve 4 Accelerator Cylinder 6 Diesel Engine (Engine)
7 Main hydraulic pump (hydraulic pump)
8 Sub hydraulic pump 9 Tank 10 Vehicle 11 Hook 12 Loading platform 13 Driver's cab 14 Chassis frame 15 Base 16 Column 17 Boom 18 Wire rope 20 Governor 21 Link 27 Main line 29 Pipe line 30 Boom hoisting hydraulic cylinder 31 Winch hydraulic motor 32 Boom Telescopic hydraulic cylinder 33 Swiveling hydraulic motor 36 Electric motor 37 Directional control valve 38 Hydraulic motor 39 Generator 40 Boom hoisting flow control valve 41 Winch flow control valve 42 Boom telescoping flow control valve 43 Swing flow control valve 44 Power generation Machine control flow control valve 46 Operation detector 50-54 Signal line 61 Power supply controller 62 Battery 63 Motor controller 65, 66 Check valve 70 Clutch mechanism C Crane body

Claims (3)

A hydraulic pump driven by an engine, a direction control valve for switching an oil passage of pressure oil discharged from the hydraulic pump, a flow control valve for controlling a flow rate of pressure oil discharged from the direction control valve, and the direction A generator drive control device for a crane mounted on a vehicle, comprising: a hydraulic motor for driving a generator driven by pressure oil discharged from the control valve; and a controller capable of controlling the direction control valve based on an operation state of the crane. Because
When the crane operation is detected, the controller switches the direction control valve so as to supply pressure oil only to the flow control valve, and when the crane operation is not detected, the controller drives the generator. A generator drive control device for a vehicle-mounted crane, wherein the directional control valve is switched so as to supply pressure oil only to a hydraulic motor. A hydraulic pump driven by an engine, a flow control valve for controlling a flow rate of pressure oil discharged from the hydraulic pump, a hydraulic motor for driving a generator controlled by the flow control valve, and an operation state of the crane A generator drive control device for a vehicle-mounted crane comprising a controller capable of controlling the flow rate control valve based on,
When the controller controls the flow rate of the flow control valve and crane operation is detected, the controller stops supplying pressure oil to the hydraulic motor for driving the generator, and the crane operation is not detected. When this is the case, the generator drive control device for a vehicle-mounted crane is characterized in that pressure oil is supplied only to the generator-driven hydraulic motor. A hydraulic pump driven by the engine, a generator driven by the engine, a clutch mechanism for interrupting driving force to the generator, and a controller capable of controlling the on / off of the clutch mechanism based on the operation state of the crane A generator drive control device for a vehicle-mounted crane comprising:
When the crane operation is detected, the controller disconnects the clutch mechanism to cut off the driving force to the generator to drive only the hydraulic pump, and when the crane operation is not detected, A generator drive control device for a vehicle-mounted crane, wherein a clutch mechanism is connected to connect a driving force to the generator to drive both the hydraulic pump and the generator.

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