JP4585784B2 - Engine control device for aerial work vehicle - Google Patents

Description

  The present invention relates to an engine control device for an aerial work vehicle including a work device that operates by taking out driving force of an engine on a vehicle body that can run with the engine.

  An aerial work vehicle for construction work or the like is generally provided with a work device such as a boom or a workbench for performing a work at a high position on the vehicle body of a vehicle capable of traveling, and the vehicle body becomes unstable when performing a work at a high place. After lifting the jack device downward and supporting the vehicle body so that it does not become an obstacle, an operator who rides on the work table operates the boom or work table and moves the work table to the desired or arbitrary work position to work at a high place Can be done.

  In such an aerial work vehicle, the driving force of the vehicle traveling engine mounted on the vehicle body is taken out by a PTO (power take-off) mechanism to drive the hydraulic pump, and by the hydraulic pressure of the hydraulic oil discharged from the hydraulic pump, The work device is configured to operate by operating a hydraulic cylinder, a hydraulic motor, or the like provided in the work device. This PTO mechanism can be switched on and off by, for example, a PTO operation lever disposed in a driving cabin of an aerial work vehicle. If the PTO mechanism is brought out of power by switching to the side of the engine, it is possible to control the hydraulic pump by controlling the engine by operating the operating lever provided on the workbench. is there.

  When working on a work site using an aerial work platform such as that described above, the PTO switch is switched to the ON side to drive the hydraulic pump, and the operator on the work table operates the boom by operating the operation lever. Is moved up and down to move the work table at the tip of the boom to a desired or arbitrary work position. After moving the workbench to the work position, work with an engine start / stop switch mounted on the workbench that allows the engine to be started or stopped to prevent noise from the engine The engine is often stopped by an operator.

As described above, in an aerial work vehicle capable of starting or stopping the engine on the workbench, if the engine start / stop switch is operated to stop the engine during the work at high place, the engine The engine control unit that controls the rotation of the engine stops the engine in response to a stop signal output from the engine start / stop switch. When the engine start / stop switch is operated to start the engine, the engine starter relay for operating the engine starter operates in response to the start signal output from the engine start / stop switch to restart the engine. . An aerial work vehicle provided with a power supply circuit capable of starting or stopping the engine from the workbench is described in, for example, Patent Document 1.
JP-A-6-48699

  By the way, while the work platform is moved to a desired or arbitrary position in order to perform work at a high place, it is necessary to keep the engine in an operating state in order to drive the hydraulic pump for operating the work device by the PTO mechanism. . For this reason, the engine key is inserted into the ignition key switch in the driving cabin of the aerial work vehicle and the engine is operated (the engine key is turned to the same ON terminal as when the vehicle is running). I had to do some work. As described above, the worker has to work at a high position with the engine key left in the driving cabin, and there is anxiety in terms of crime prevention.

  In view of the above problems, the present invention provides an engine control device for an aerial work vehicle that can start or stop the engine on the workbench even when the engine key is removed from the ignition key switch in the driving cabin. The purpose is to provide.

In order to solve the above-described problems, an engine control device for an aerial work vehicle according to the present invention includes a vehicle that can travel using the driving force of the engine (for example, the aerial work vehicle 1 in the embodiment), and the driving force of the engine. Power take-off mechanism (for example, the PTO mechanism 15 in the embodiment) and a work device (for example, a boom in the embodiment) that is disposed on the vehicle body and operates using a driving force that is taken out by the power take-off mechanism. 5) and connected to the battery via a first power supply line (for example, the line 61 and the line 65 in the embodiment) provided in the driver's seat of the vehicle (for example, the driving cabin 2a in the embodiment) or start the engine An ignition key switch that can be turned on and off, and an ignition key switch provided on the work device. When the ignition key switch is on the on-operation side and connected to a second power supply line (for example, line 71, line 72, and line 73 in the embodiment) extending from the second power supply line, An engine start / stop switch that can be turned on / off to start or stop the engine, and a starter motor that is connected to an ignition key switch and an engine start / stop switch and starts the engine by turning on the engine start / stop switch ( For example, the engine starter 81) in the embodiment, an engine controller (for example, an engine starter in the embodiment) that is connected to an ignition key switch and an engine start / stop switch and stops the engine in response to an off operation of the engine start / stop switch. In an engine control apparatus for an aerial work vehicle having a control unit 36), a bypass line (for example, bypass circuit 74 in the embodiment) in which the first power supply line and the second power supply line are directly connected, and a bypass line Opening / closing means for conducting or blocking the bypass line, power take-off operating means (for example, the PTO operation lever 13 in the embodiment) for operating the power take-off mechanism, and the vehicle stops Vehicle stop detection means (for example, the vehicle stop detector 14 in the embodiment) for detecting whether or not the vehicle is in a state, and the opening / closing means is opened / closed in response to an on / off operation of the power take-off operating means. 1 opening / closing means (for example, first bypass circuit opening / closing switch 31 in the embodiment) and vehicle stop detection Second opening / closing means (for example, the second bypass circuit opening / closing switch 32 in the embodiment) that is opened and closed based on detection by the means, and the first opening / closing means is turned on when the power take-off operating means is turned on. The second opening / closing means is configured to be in the closed state when the vehicle stop state is detected by the vehicle stop detection means .

When both the first and second opening / closing means are closed, the electric power from the battery is supplied to the engine start / stop switch via the bypass line regardless of whether the ignition key switch is turned on or off. The engine can be started or stopped by the control of a starter motor or an engine controller in accordance with the on / off operation of the start / stop switch.

  According to the engine control device for an aerial work vehicle according to the present invention, in a state where the aerial work vehicle is stopped and the PTO operation lever is operated to the on side in order to operate the work device such as a boom. Even if the engine key is removed from the ignition key switch in the driving cabin, the engine can be started or stopped from the working device side by operating the engine start / stop switch provided in the working device. For this reason, it is not necessary to perform the high place work while leaving the engine key in the driving cabin, and the worker can perform the high place work without worrying about the engine key.

  A preferred embodiment of an engine control device for an aerial work vehicle according to the present invention will be described below with reference to FIGS. FIG. 1 shows an example of an aerial work vehicle equipped with an engine control apparatus according to the present invention. The aerial work vehicle 1 is capable of traveling with front and rear wheels 3a and 3b on the front, rear, left and right sides of the vehicle body 2, and is constructed based on a truck vehicle having a driving cabin 2a at the front portion of the vehicle body 2. On the vehicle body 2 of the truck vehicle, there is disposed a turntable 4 that is driven by a turn motor 51 and configured to be able to turn horizontally. The base 5 is pivotally connected to the swivel 4 and a boom 5 is attached. The boom 5 is moved up and down by a hoisting cylinder 52. The boom 5 is configured such that the base boom 5a, the intermediate boom 5b, and the tip boom 5c are combined in a telescopic manner, and the entire boom 5 is movable in the longitudinal axis direction by a built-in telescopic cylinder 53. Hereinafter, the turning motor 51, the raising and lowering cylinder 52, and the telescopic cylinder 53 will be collectively referred to as a “boom actuator 55”.

  The tip boom 5c has a boom head 5d at the tip, and a vertical post member 6 is pivotably attached to the boom head 5d so as to swing up and down. The vertical post member 6 is controlled by swinging of the vertical post member 6 by a leveling cylinder (not shown) disposed between the tip of the front end boom 5c or the boom head 5d and the vertical post member 6, and the boom 5 is raised and lowered. Regardless, the leveling cylinder is controlled so that the vertical post member 6 always extends vertically. The work table 7 is attached to the vertical post member 6 that is always held vertically in such a manner that it can be swiveled horizontally (swinged freely) by a swiveling motor (not shown). Retained.

  The vehicle body 2 is provided with jacks 8 that are widened outwardly in the left-right direction and retractable below the vehicle body 2 at four locations on the front, rear, left, and right sides of the vehicle body 2. The vehicle body 2 can be stably lifted and supported by widening left and right and extending downward and extending. Furthermore, a PTO operation lever 13 that can be switched on and off is attached in the driving cabin 2a, and a power take-off mechanism (hereinafter referred to as "PTO mechanism"), which will be described later, is attached by the PTO operation lever 13. It is possible to perform an on / off operation switching operation.

  An upper operation device 11 for controlling the operation of the boom 5 and the like is attached to the work table 7, and a lower operation device 12 for operating the operation of the boom 5 or the jack 8 is attached to the rear end portion of the vehicle body 2. It has been. For this reason, when the operator boarding the work table 7 operates the upper operation device 11, the boom 5 moves up and down, expands and contracts, swivels the swivel 4, and vibrates the work table 7. Can be moved to a desired or arbitrary high position, and an operator on the ground can perform the same operation using the lower operation device 12. Further, when working at a high place, the operator can stably support the vehicle body 2 by operating the jack operation lever provided on the lower operation device 12 to extend and ground the jack 8.

  As shown in FIG. 2, the operation control of the aerial work vehicle 1 configured as described above is provided in the vicinity of the upper operation device 11 that operates the boom 5 and the like and the upper operation device 11, for example. The engine start / stop switch 23, the lower operation device 12 for operating the jack 8 and the like, and the operation signals output from the operation devices 11, 12 by the operation of the operation devices 11, 12 are controlled by the hydraulic unit 50. A controller 35 that outputs a signal to control the operation of the boom 5 and the workbench 7, a hydraulic unit 50 that controls supply and discharge of hydraulic oil to the hoisting cylinder 52 and the like based on a control signal from the controller 35, and a controller 35 The engine control unit (hereinafter referred to as “ECU”) 36 for controlling the rotation of the engine ENG based on the control signal from .

  The operation of the jack cylinder 56 for expanding and contracting the boom actuator 55 and the jack 8 is specifically performed using the hydraulic pressure of the hydraulic oil discharged from the hydraulic pump P. The vehicle body 2 has a tank for storing the hydraulic oil, a hydraulic pump P that sucks the hydraulic oil in the tank and discharges the hydraulic oil of a predetermined hydraulic pressure and amount, a supply direction and supply amount of the hydraulic oil discharged from the hydraulic pump P. A hydraulic unit 50 including an electromagnetic proportional valve to be controlled is provided.

  Operation signals from the upper operation device 11 and the lower operation device 12 are input to the controller 35 in the control device 30. Among these, based on an operation signal output from the upper operating device 11 to vibrate the work table 7, a swing motor (not shown) provided on the vertical post member 6 is operated to vibrate the work table 7. Further, an operation signal for operating the boom actuator 55 from the upper operation device 11 or an operation signal for operating the jack cylinder 56 from the lower operation device 12 is input to the controller 35, and hydraulic pressure is based on these operation signals. The operation of the boom actuator 55 and the jack cylinder 56 are controlled by controlling the operation direction and valve opening of the electromagnetic proportional valve provided in the unit 50 and corresponding to the swing motor 51, the hoisting cylinder 52, the telescopic cylinder 53, etc. That is, the operation of the boom 5 and the jack 8 is controlled.

  In addition to the operation signals from the operation devices 11 and 12, the controller 35 receives an operation signal from the engine start / stop switch 23 and a detection signal from the vehicle stop detector 14 provided in the vehicle body 2. . Specifically, when an operation signal is output from the engine start / stop switch 23, the controller 35 starts the engine ENG. C. U. The engine ENG is controlled by 36. Further, while the aerial work vehicle 1 is stopped, the vehicle stop detector 14 outputs a detection signal to the controller 35, so that the controller 35 can determine that the aerial work vehicle 1 is stopped. it can.

  When the shift lever 16 is set to the neutral state, the vehicle stop detector 14 detects the stop state of the aerial work vehicle 1 and outputs a detection signal to the controller 35 or within the driving cabin 2a. You may comprise so that a detection signal may be output to the controller 35, when the brakes which are provided, such as a foot brake or a side brake which is not shown in figure, act | operate. Furthermore, a detector for detecting the rotation of the wheel may be provided on either the front wheel 3a or the rear wheel 3b, and this may be used as a vehicle stop detection means.

  As will be described later, the control device 30 has a power supply circuit for starting or stopping the engine ENG. The power supply circuit includes first and second bypass circuit opening / closing switches 31 and 32, a PTO switch 33, and The engine starter relay 34 is configured.

  In the aerial work platform 1, the driving force of the engine ENG is used as a power source for rotating the hydraulic pump P, and this driving force is extracted by the PTO mechanism. FIG. 3 shows a power transmission mechanism of the aerial work vehicle 1 as a block diagram. Hereinafter, the power transmission mechanism of the aerial work vehicle 1 will be described with reference to FIG.

  The accelerator pedal 21 disposed in the driving cabin 2a is equipped with a potentiometer 21a (wire reel type variable resistor), and an accelerator signal corresponding to the depression amount of the accelerator pedal 21 is transmitted to the E.P. C. U. By outputting to 36, throttle opening control and fuel supply control of the engine ENG are performed, and the rotational speed of the engine ENG is changed. Then, the driving force of the engine ENG is transmitted to the traveling device 40 (rear wheel 3b, etc.) via the transmission TM to cause the vehicle body 2 to travel, and when the working device such as the boom 5 is operated, the driving force of the engine ENG is described later. It is also transmitted to the hydraulic unit 50 through the PTO mechanism 15 that performs the above operation.

  The driving force of the engine ENG is transmitted to the propeller shaft PS via a clutch (not shown) in the transmission TM, and further transmitted to the left and right rear wheels 3b via a differential mechanism (not shown) and left and right drive shafts (not shown). Car 1 is driven. The transmission TM is a so-called manual transmission, and is set to each speed stage such as neutral (neutral state), low, 2nd or reverse by operating the shift lever 16 after depressing the clutch pedal in the driving cabin 2a. it can.

  In addition, the aerial work vehicle 1 is provided with a PTO mechanism 15 for transmitting the driving force of the engine ENG to the hydraulic unit 50 so that the driving force of the engine ENG can be taken out or disconnected. When the PTO operation lever 13 is turned on to operate such a PTO mechanism 15, the operation force of the PTO operation lever 13 is applied to the PTO mechanism 15 via a transmission means such as a wire extending from the PTO operation lever 13 to the PTO mechanism 15. Then, the clutch in the PTO mechanism 15 is engaged, and the driving force of the engine ENG is transmitted to the hydraulic unit 50. In addition, a limit switch (not shown) is provided in the vicinity of the PTO operation lever 13, and when the PTO operation lever 13 is turned on, this limit switch is activated to detect the state of taking out the driving force of the engine ENG. The

  Here, a schematic configuration of the power supply circuit 90 for starting and stopping the engine ENG provided in the aerial work vehicle according to the present invention will be described with reference to a block wiring diagram shown in FIG.

  As shown in FIG. 4, the power supply circuit 90 is described above when the ignition key switch 17 provided in the operation cabin 2a and performing an operation for starting and stopping the engine ENG and the PTO operation lever 13 are in the on position. The limit switch is activated, and the switch contact is closed (turned on) based on the detection signal from the limit switch. Second bypass circuit opening / closing switch 32 that closes the switch contact based on detection (activates on), switch based on detection signal from limit switch near PTO operation lever 13 when PTO operation lever 13 is in the ON position When power is supplied to the PTO switch 33 and the relay coil R that close the contact (activate the contact) As shown in the engine starter relay 34 and a switch terminal to be closed and the like wiring line connecting between these devices. The negative electrode side of the battery B is connected to the vehicle body chassis to form a ground, and the negative electrode side of each device is connected to the vehicle body chassis to form a negative electrode side wiring line. Note that at least one of the first bypass circuit opening / closing switch 31 and the PTO switch 33 may be configured to be also used as the limit switch for detecting that the PTO operation lever 13 is turned on.

  Electric power from battery B is connected to one of the switch terminals of engine starter relay 34 via line 61 and line 62, and the other side of this switch terminal is connected to the positive side of engine starter 81 via line 63. . The negative side of engine starter 81 is connected to the vehicle body chassis via line 64 and further connected to the negative side of battery B.

  On the other hand, the electric power from the battery B is also connected to the battery terminal (B) of the ignition key switch 17 via the line 65. The ignition key switch 17 has a plurality of terminals including start (ST), operation (ON), stop (OFF), and battery (B) of the engine ENG. By rotating, the engine key is aligned with any of the start (ST), operation (ON), and stop (OFF) terminals, and the electric power from the battery B is connected to each terminal via these terminals. It is possible to supply the line. The engine key is inserted and removed with the engine key set to the stop terminal (OFF).

  The start terminal (ST) is connected to one end of the relay coil R in the engine starter relay 34 via a line 67, and the other end is connected to the vehicle body chassis via a line 68. Therefore, when the engine key is turned to the starting position (ST), the electric power from the battery B is supplied to the relay coil R through the line 67, and the switch terminal of the engine starter relay 34 is closed. At this time, the electric power from the battery B is supplied to the engine starter 81 via the lines 61, 62 and 63 to operate the engine starter 81, and the engine ENG can be started. A line 66 also extends from the starting terminal (ST) of the ignition key switch 17 and is connected to the controller 35.

  Further, the operation terminal (ON) of the ignition key switch 17 is connected to the E.E. C. U. 36. The operation terminal (ON) is also connected to one side of the switch terminal of the PTO switch 33 via the line 71 and is connected to the controller 35 via the line 72 from the other side of the switch terminal of the PTO switch 33. The PTO switch 33 closes the switch contact (turns on) based on an operation signal from the PTO operation lever 13 when the PTO operation lever 13 is in the on position.

  The controller 35 is connected to the engine start / stop switch 23 via a line 73. For this reason, when the PTO mechanism 15 is operated by operating the PTO operation lever 13 to the ON side while the engine key is at the operating position (ON), the switch terminal of the PTO switch 33 is closed and the battery B Since the electric power from is supplied to the controller 35, the operator who is on the work table 7 can start or stop the engine ENG by turning on or off the engine start / stop switch 23.

  That is, when the engine start / stop switch 23 is turned on, a start signal output from the engine start / stop switch 23 is received, and a current flows through the relay coil R of the engine starter relay 34 to switch the engine starter relay 34. When the engine is in the closed state, the engine starter 81 operates to start the engine ENG. On the other hand, when the engine start / stop switch 23 is turned off, the engine E.G. C. U. 36 receives the stop signal output from the engine start / stop switch 23 and stops the engine ENG. The power supply circuit 90 configured in this way makes it possible to start or stop the engine ENG from the work table 7 or the like.

  In the power supply circuit 90 configured as described above, the battery terminal (B) and the operation terminal (ON) of the ignition key switch 17 are short-circuited by the Pibus circuit 74, and the ignition key switch 17 is operated under the conditions described below. It is possible to start or stop the engine ENG by operating the engine start / stop switch 23 on the work table 7 with the engine key removed.

  On the bypass circuit 74, a first bypass circuit on / off switch 31 and a second bypass circuit on / off switch 32 are provided. That is, the battery terminal (B) of the ignition key switch 17 is connected to one side of the switch terminal of the second bypass circuit on / off switch 32 via the line 74a, and is connected to the line from the other side of the switch terminal of the second bypass circuit on / off switch 32. 74b extends to be connected to one side of the switch terminal of the first bypass circuit opening / closing switch 31. Furthermore, the other side of the switch terminal of the first bypass circuit opening / closing switch 31 is connected to the operation terminal (ON) of the ignition key switch 17 via a line 74c.

  The first bypass circuit opening / closing switch 31 closes the switch contact based on the operation signal from the PTO operation lever 13 when the PTO operation lever 13 is in the ON position, and the second bypass circuit opening / closing switch 32 is When the stop state of the aerial work vehicle 1 is detected by the vehicle stop detector 14, the switch contact is closed.

  Since the power circuit 90 is provided with such a Pibus circuit 74, the switch terminal of the second bypass circuit opening / closing switch 32 is closed when the aerial work vehicle 1 stops traveling, and the aerial work is performed. When the PTO operation lever 13 is operated to the ON side while the vehicle 1 stops traveling, the switch terminal of the first bypass circuit opening / closing switch 31 is closed and the bypass circuit 74 is conducted. For this reason, even if the engine key is not rotated to the operation position (ON) and is in the stop position (OFF), the power from the battery B is supplied to the controller 35 via the Pibus circuit 74. Therefore, if the aerial work vehicle 1 is stopped from traveling and the PTO operation lever 13 is operated to the on side, the worker on the workbench 7 can set the engine start / stop switch 23. The engine ENG can be started and stopped by operating.

  Here, in the aerial work platform 1 equipped with the power supply circuit 90 configured as described above, the engine start / stop switch 23 disposed on the work table 7 is used while the engine key is removed from the ignition key switch 17. Operations for starting and stopping the engine ENG will be described.

  The aerial work vehicle 1 is made to travel with the PTO operation lever 13 turned off (at this time, the engine key is in the operating position (ON) of the ignition key switch 17), and after arriving at a desired work site, the engine The key is rotated to the stop position (OFF) of the ignition key switch 17, and the engine key is removed from the ignition key switch 17.

  When the PTO operation lever 13 is moved to the on position side in order to extract the driving force of the engine ENG and operate the boom 5 and the like, the first bypass circuit opening / closing switch 31 is closed based on the on operation of the PTO operation lever 13. become. On the other hand, when the aerial work vehicle 1 stops, the vehicle stop detector 14 detects the vehicle stop state, and the second bypass circuit open / close switch 32 is already closed. For this reason, when the PTO operation lever 13 is turned on, the bypass circuit 74 becomes conductive, the battery terminal (B) of the ignition key switch 17 and the operation terminal (ON) are connected, and the electric power from the battery B passes through the bypass circuit 74. Supplied to the operation terminal (ON) side.

  In this state, the PTO switch 33 is also closed by the ON operation of the PTO operation lever 13, so that the line 71 and the line 72 are electrically connected, and the engine start / Electric power from the battery B is supplied to the stop switch 23. Accordingly, when the operator who has boarded the work table 7 turns on the engine start / stop switch 23, a start signal for starting the engine ENG is output even though the engine key is removed from the ignition key 17. be able to.

  If the operator turns on the engine start / stop switch 23 while the electric power from the battery B is supplied to the engine start / stop switch 23, the start signal from the engine start / stop switch 23 is a line 73, a controller. 35 and the line 66 reach the starting terminal (ST) of the ignition key switch 17. The start signal is further sent from here to the relay coil R of the engine starter relay 34 via a line 67. For this reason, the changeover switch of the engine starter relay 34 is opened and the lines 62 to 63 are conducted.

  Therefore, the current from the battery B flows to the engine starter 81 to operate the engine starter 81 and start the engine ENG. At this time, since the PTO operation lever 13 is turned on, the driving force of the engine ENG can be taken out by the PTO mechanism 15 to the work device such as the boom 5, and the worker who has boarded the work table 7. However, by operating the upper operation device 11, the boom 5 and the like can be operated, and the work table 7 at the tip of the boom 5 can be moved to a desired or arbitrary high position.

  After the work table 7 is moved to a desired or arbitrary work position, the engine start / stop switch 23 is turned off to output a stop signal for stopping the engine. This stop signal passes through the line 73, the controller 35, the line 72, the PTO switch 33, and the line 71 and reaches the operation terminal (ON) of the ignition key switch 17. From there, a further stop signal is sent to E. C. U. 36. C. U. 36 can be controlled to stop the engine ENG.

It is a perspective view of an aerial work vehicle according to the present invention. It is a block diagram which shows the operation control in the said aerial work vehicle. It is a block diagram which shows the power transmission mechanism of the engine in the said aerial work vehicle. It is a block wiring diagram which shows the structure of the power supply circuit provided in the said aerial work vehicle.

Explanation of symbols

1 Aerial work vehicle (vehicle)
2 Car body 2a Driving cabin (driver's seat)
4 swivel (working device)
5 Boom (Working device)
5a Base boom (working device)
5b Intermediate boom (working device)
5c Tip boom (working device)
7 Work table (work equipment)
13 PTO control lever (Power take-off actuating means)
14 Vehicle stop detector (vehicle stop detection means)
15 PTO mechanism (Power take-off mechanism)
17 Ignition key switch 23 Engine start / stop switch 30 Controller 31 First bypass circuit on / off switch (opening / closing means, first opening / closing means)
32 Second bypass circuit opening / closing switch (opening / closing means, second opening / closing means)
33 PTO switch 35 Controller 36 Engine control unit (engine controller)
61 lines (first feed line)
65 lines (first feed line)
71 lines (second feed line)
72 lines (second feed line)
73 lines (second feed line)
74 Bypass circuit (bypass line)
74a line (bypass line)
74b line (bypass line)
74c line (bypass line)
81 Engine starter (starter motor)
90 Power circuit B Battery ENG Engine

Claims (1)

A vehicle that can run using the driving force of the engine, a power take-off mechanism that can extract the driving force of the engine, and a driving force that is disposed on the vehicle body of the vehicle and is extracted by the power take-off mechanism A working device that is provided in a driver's seat of the vehicle, connected to a battery via a first power supply line, and capable of an on / off operation for starting or stopping the engine, and provided in the working device ON that is connected to a second power supply line that extends from the ignition key switch and that starts or stops the engine upon receiving power from the second power supply line when the ignition key switch is on the on-operation side. Engine start / stop switch that can be turned off, ignition key switch and A starter motor connected to the engine start / stop switch and starting the engine by turning on the engine start / stop switch; connected to the ignition key switch and the engine start / stop switch; and In an engine control device for an aerial work platform having an engine controller that stops the engine in response to an off operation of a stop switch,
A bypass line in which the first power supply line and the second power supply line are directly connected;
Opening / closing means provided on the bypass line and conducting or blocking the bypass line;
Power take-off actuating means for operating the power take-off mechanism to turn on / off;
Vehicle stop detection means for detecting whether the vehicle is in a stopped state,
The opening / closing means has a first opening / closing means opened / closed in response to an on / off operation of the power take-off operating means, and a second opening / closing means opened / closed based on detection by the vehicle stop detection means. The first opening / closing means is closed when the power take-off actuating means is turned on, and the second opening / closing means is closed when the stop state of the vehicle is detected by the vehicle stop detection means. It becomes a state,
When both the first and second opening / closing means are closed, power from the battery is supplied to the engine start / stop switch via the bypass line regardless of whether the ignition key switch is turned on or off. An engine control device for an aerial work vehicle, wherein the engine can be started or stopped by control of the starter motor or the engine controller in accordance with an on / off operation of the engine start / stop switch.

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