JP7432336B2 - power working machine - Google Patents

Description

The present invention relates to a power working machine.

Conventional power working machines such as chainsaws, brush cutters, and blowers are equipped with an engine, a generator that generates electricity by rotating a crankshaft, and a starter device that rotates the crankshaft by pulling a rope (for example, (See Patent Document 1). Further, the power working machine includes an electromagnetic valve provided in a fuel supply path connected to the engine, and a capacitor (power storage device) that supplies power to the ignition device of the engine.

When starting the engine of a conventional power working machine, the operator pulls the rope of the starter device, and power is supplied from the generator to the solenoid valve and the capacitor. Then, the electromagnetic valve opens when energized, and fuel is supplied into the cylinders of the engine through the fuel supply path. The capacitor then supplies power to the engine's ignition system, starting the engine.

Japanese Patent Application Publication No. 2016-125347

In the conventional chain saw described above, the valve element of the solenoid valve may become stuck to the valve seat surface due to the influence of oil contained in the fuel. In this case, even if power is supplied to the solenoid valve from the generator, it is difficult to open the solenoid valve, so there is a problem that the startability of the engine is reduced.

An object of the present invention is to provide a power working machine that can solve the above-mentioned problems and improve engine startability.

In order to solve the above problems, the present invention provides a power working machine that includes a working tool, an engine that drives the working tool, a generator that generates electricity by rotation of the crankshaft of the engine, and a power working machine that generates electricity by inputting from the outside. The engine includes a starter device that rotates the crankshaft, and a control device. A fuel supply path connected to the engine is provided with a solenoid valve that opens when energized. The electric power generated by the generator is configured to be supplied to the ignition device of the engine and also to the solenoid valve. When input from the outside to the starter device, the control device controls at least a portion of the power generated by the generator to be supplied from the generator to the ignition device, to the solenoid valve. A starting assist mode in which power is supplied with priority can be executed, and a normal starting mode in which power generated by the generator is supplied to the ignition device and the solenoid valve can be executed. The electric power supplied to the solenoid valve in the starting assist mode is greater than the electric power supplied to the solenoid valve in the normal starting mode.

In the power working machine of the present invention, by feeding power preferentially to the electromagnetic valve when starting the engine, the electromagnetic valve opens more easily, so that the startability of the engine can be improved.

FIG. 1 is a side view showing a chainsaw according to a first embodiment of the present invention. FIG. 1 is a block diagram showing each part of a chainsaw according to a first embodiment of the present invention. It is a simple time table showing control at the time of starting the chainsaw according to the first embodiment of the present invention. It is a simple timetable showing control at the time of starting in a chainsaw according to a second embodiment of the present invention. It is a block diagram showing each part of a chain saw concerning a third embodiment of the present invention. It is a block diagram showing each part of a chain saw concerning a fourth embodiment of the present invention.

An example of an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
In addition, in the description of each embodiment, the same reference numerals will be given to the same components, and duplicate description will be omitted.
In the following embodiments, a structure in which the present invention is applied to a chain saw for cutting trees, boards, etc. will be described as an example.

[First embodiment]
As shown in FIG. 1, the chainsaw 1A of the first embodiment is a small and lightweight hand-held working machine, and includes a main body case 10 which is a box made of resin, a cutting section 20 provided on the main body case 10, and a cutting section 20 provided in the main body case 10. It includes an engine 30 that drives the section 20 and a fuel tank 40. Further, as shown in FIG. 2, inside the main body case 10 of the chain saw 1A, a generator 50, a starter device 60, a power storage device 70 including a capacitor, etc., and a control device 100 are provided.

The engine 30 of the first embodiment is a known two-stroke engine, and the ignition device 32 ignites and burns the air-fuel mixture in the cylinder, causing the piston to reciprocate and the crankshaft 31 to rotate. Ignition device 32 is electrically connected to power storage device 70.

As shown in FIG. 1, the main body case 10 is provided with a cutting portion 20 that projects forward. The cutting section 20 is a working tool for cutting work, and includes a guide bar 21 and a saw chain 22.
The guide bar 21 is a plate-like member extending in the front-rear direction, and a rear end portion of the guide bar 21 is attached to the main body case 10.

An annular saw chain 22 is wound around the outer periphery of the guide bar 21 . A rear end portion of the saw chain 22 is engaged with a drive gear (not shown) connected to a crankshaft 31 of an engine 30.
When the engine 30 is driven to rotate the drive gear, the saw chain 22 rotates along the outer periphery of the guide bar 21.

When cutting an object to be cut, such as a tree or a board, with the chainsaw 1A, an operator grasps the top handle 12 and rear handle 13 of the main body case 10 and carries the chainsaw 1A.
When the operator pulls the trigger lever 13a of the rear handle 13, the saw chain 22 rotates in conjunction with the rotation of the crankshaft 31. Thereby, the object to be cut can be cut by the saw chain 22.

As shown in FIG. 2, the main body case 10 is provided with a rotation measuring device 35 that measures the amount of rotation (number of rotations) of the crankshaft 31.
The rotation measuring device 35 is electrically connected to the control device 100 by wiring, and the measured rotation amount is output to the control device 100.

A temperature sensor S that directly measures the temperature of the engine 30 is attached to the engine 30. The temperature sensor S is electrically connected to the control device 100 by wiring, and the measured temperature is output to the control device 100.

The temperature measured by the temperature sensor S is used in the control device 100 for control at the time of starting the engine 30 and other controls.
For example, the control device 100 can detect the sliding state of the piston relative to the cylinder of the engine 30 based on the temperature measured by the temperature sensor S. When the temperature of the engine 30 is high, there is a possibility that the frictional heat between the cylinder and the piston is high, and maintenance of the engine 30 is required.
Furthermore, the control device 100 can also execute cold start control or warm start control that adjusts the mixture ratio of fuel and air based on the temperature measured by the temperature sensor S.

A fuel supply path 45 is connected to the engine 30 for supplying fuel from a fuel tank 40 into the cylinders. The fuel supply path 45 is provided with a manual pump P and a normally closed solenoid valve 80.

The manual pump P sucks out the fuel in the fuel tank 40 and sends it to the electromagnetic valve 80 side. Before starting the engine 30, an operator operates the manual pump P to supply fuel in the fuel tank 40 to the solenoid valve 80.

The solenoid valve 80 is a solenoid valve that is provided with a valve body and an electromagnetic coil that drives the valve body. Under normal conditions (when not energized), the valve body is seated on the valve seat surface and the valve is closed. When the electromagnetic coil is energized, the valve body is separated from the valve seat surface and opens, and fuel flows into the solenoid valve. 80 can be distributed. The electromagnetic coil of electromagnetic valve 80 is electrically connected to generator 50 and power storage device 70 via wiring C1.

The generator 50 is a known generator that uses the rotation of the crankshaft 31 as its power source. Generator 50 is electrically connected to power storage device 70 and electromagnetic valve 80 via wiring C1. Power is then supplied from the generator 50 to the power storage device 70 and the solenoid valve 80 .

Power storage device 70 is electrically connected to generator 50 and electromagnetic valve 80 through wiring C1, and electrically connected to ignition device 32 through wiring C2. By supplying power from the generator 50 to the power storage device 70, the power storage device 70 stores power.

A switch SW1 is provided in the wiring C1 between the generator 50 and the power storage device 70, and the solenoid valve 80. Switch SW1 is electrically connected to control device 100 by wiring.
Switch SW1 is normally in a non-power supply state (OFF), and when switched from a non-power supply state to a power supply state (ON) by the control device 100, power is supplied from the generator 50 to the electromagnetic coil of the solenoid valve 80 and the power storage device 70. Ru. When the electric charge accumulates in the power storage device 70 to the maximum, the electric power supplied from the generator 50 to the power storage device 70 is also transferred to the solenoid valve 80 unless SW2 for feeding power to the ignition device 32 is turned on. Power is supplied to the electromagnetic coil.

Note that a switch (not shown) is provided between the generator 50 and the capacitor or the like of the power storage device 70, and by turning the switch on and off, the amount of charge stored in the power storage device 70 is also supplied to the electromagnetic coil of the solenoid valve 80. It may be configured as follows. Further, the circuit may be changed so that the electric power stored in the power storage device 70 is supplied to the electromagnetic coil of the electromagnetic valve 80.

A switch SW2 is provided in the wiring C2 between the power storage device 70 and the ignition device 32 of the chain saw 1A of the first embodiment. Switch SW2 is electrically connected to control device 100 by wiring.
Switch SW2 is normally in a non-power supply state (OFF), and when switched from the non-power supply state to a power supply state (ON) by control device 100, power is supplied from power storage device 70 to ignition device 32.

The starter device 60 causes the generator 50 to generate electricity by rotating the crankshaft 31 based on input from the outside. The starter device 60 is a known recoil starter having a rope 61 wound around a pulley connected to the crankshaft 31, as shown in FIG.
When the operator pulls the rope 61 from outside the chainsaw 1A and rotates the crankshaft 31, the generator 50 is activated to generate electricity.

As shown in FIG. 2, the control device 100 is housed in a main body case 10, and has electronic components such as a CPU and memory attached to a board on which an electronic circuit is printed.
The control device 100 is electrically connected to the switches SW1, SW2, the temperature sensor S, and the rotation measuring device 35 by wiring. The control device 100 reads data from the rotation measuring device 35 as rotation speed and rotation amount (rotation number).

When starting the engine 30, the control device 100 can execute a normal starting mode in which the electric power generated by the generator 50 is supplied to the ignition device 32 and the solenoid valve 80.
Further, when starting the engine 30, the control device 100 uses the portion of the electric power generated by the generator 50 to be supplied to the ignition device 32 to the solenoid valve 80, so that the solenoid valve 80 It is possible to execute a starting assist mode in which power is supplied with priority to the engine.

In the control device 100, when the temperature of the engine 30 measured by the temperature sensor S does not reach a predetermined value, the start assist mode is executed when input to the starter device 60 from the outside.
Note that the main body case 10 may be configured to switch between the normal starting mode and the starting assist mode by operating a switch or lever provided on the main body case 10.

In the normal starting mode by control device 100, when a worker operates starter device 60, power is supplied from generator 50 to power storage device 70. Further, the switch SW1 enters the power supply state, and part of the power generated by the generator 50 is supplied to the solenoid valve 80. As a result, the solenoid valve 80 opens and fuel is supplied to the engine 30. Further, control device 100 turns switch SW2 into a power supply state, and power is supplied from power storage device 70 to ignition device 32, so that the air-fuel mixture in the cylinder is combusted and engine 30 is started.
In the normal starting mode, the power supplied from the generator 50 to the ignition device 32 via the power storage device 70 is set to be greater than the power supplied from the generator 50 to the solenoid valve 80.

Next, the starting assist mode in the chainsaw 1A of the first embodiment will be explained. In the following description, the time chart of FIG. 3 will be referred to as appropriate.

First, an operator pulls the rope of the starter device 60 to cause the generator 50 to generate electricity. At this time, the switch SW1 between the generator 50 and the electromagnetic valve 80 is in a non-power supply state, so the power generated by the generator 50 is supplied to the power storage device 70.

The control device 100 switches the switch SW1 from the non-power supply state to the power supply state at an optimal timing.
As a result, as long as switch SW2 for supplying power to ignition device 32 is not in the power supply state, the amount of power supplied from generator 50 to power storage device 70 is also supplied to the electromagnetic coil of solenoid valve 80.

In this case, a switch (not shown) is provided between the generator 50 and the capacitor of the power storage device 70, and by turning the switch ON and OFF, the power stored in the power storage device 70 is also supplied to the electromagnetic coil of the solenoid valve 80. It may be configured as follows.
Further, in this case, the circuit may be changed so that the electric power stored in the power storage device 70 is supplied to the electromagnetic coil of the electromagnetic valve 80.
As a result, power is supplied from the generator 50 to the solenoid valve 80, and a portion of the power stored in the power storage device 70 is also supplied to the solenoid valve 80.
As a result, at least a portion of the power to be supplied from the generator 50 to the ignition device 32 is preferentially supplied to the solenoid valve 80.

The power supplied to the solenoid valve 80 in the starting assist mode of the first embodiment is greater than the power supplied to the solenoid valve 80 in the normal starting mode.
In this way, as shown in FIG. 3, when the start control mode is executed, the switch SW1 is switched from the non-power supply state to the power supply state every time the crankshaft 31 shown in FIG. Power is supplied to the solenoid valve 80 from the solenoid valve 80.
Therefore, in the start control mode of the first embodiment, by repeatedly supplying large electric power to the solenoid valve 80, the solenoid valve 80 becomes easier to open.

In the control device 100 of the first embodiment, after preferentially feeding power to the solenoid valve 80, the switch SW2 between the power storage device 70 and the ignition device 32 is switched from the non-power feeding state to the power feeding state. In this manner, in the starting assist mode, after power is supplied to the solenoid valve 80, power is supplied once from the generator 50 to the ignition device 32 via the power storage device 70.
When the solenoid valve 80 is open due to power being supplied from the generator 50 to the solenoid valve 80, fuel is being supplied to the engine 30, so the ignition device 32 ignites the air-fuel mixture in the cylinder. Then, the engine 30 starts.

If the engine 30 does not start during the first input to the starter device 60, the operator pulls the rope of the starter device 60 again to cause the generator 50 to generate electricity. The control device 100 selects whether to repeat the starting assist mode or shift to the normal starting mode every time an input is made to the starter device 60 until the engine 30 starts.

The control device 100 controls the control device 100 to ensure that at least one of the rotation amount at the time of the previous input, the total number of rotation amounts up to the previous time, and the previous rotation speed of the crankshaft 31 reaches a specified value at the time of the second and subsequent inputs to the starter device 60. If not, the starting assist mode is executed also when inputting to the starter device 60 for the second time.
Note that the total amount of rotation of the crankshaft 31 is the sum of the amount of rotation of the crankshaft 31 from the first input to the starter device 60.
In addition, in the control device 100, when the rotation amount, the total number of rotations, and the rotation speed of the crankshaft 31 have all reached the specified values at the time of input to the starter device 60 for the second and subsequent times, the control device Upon input to device 60, a normal startup mode may be configured to execute.

The chainsaw 1A (power working machine) of the first embodiment as described above includes a cutting section 20 (working instrument) and an engine 30 that drives the cutting section 20, as shown in FIG. Further, as shown in FIG. 2, the chainsaw 1A includes a generator 50 that generates electricity by rotation of the crankshaft 31 of the engine 30, a starter device 60 that rotates the crankshaft 31 by input from the outside, and a control device 100. It is equipped with The fuel supply path 45 connected to the engine 30 is provided with a solenoid valve 80 that opens when energized. The electric power generated by the generator 50 is configured to be supplied to the ignition device 32 of the engine 30 and also to the solenoid valve 80 . When input to the starter device 60 from the outside, the control device 100 executes a starting assist mode in which the electric power generated by the generator 50 is fed to the solenoid valve 80 with priority.
In this way, by feeding power preferentially to the solenoid valve 80 when starting the engine 30, the solenoid valve 80 opens more easily, so that the startability of the engine 30 can be improved. Further, this configuration is effective when the solenoid valve 80 is fixed.

In the starting assist mode of the first embodiment, at least a part of the power for feeding the ignition device 32 from the generator 50 is fed preferentially to the solenoid valve 80, thereby making it easier to open the solenoid valve 80. ing. Further, this configuration is effective when the solenoid valve 80 is fixed.

The control device 100 can execute a normal starting mode in which the electric power generated by the generator 50 is supplied to the ignition device 32 and the solenoid valve 80 when inputted to the starter device 60 from the outside. Then, it is preferable to supply large power to the solenoid valve 80 in the starting assist mode by making the power supplied to the solenoid valve 80 in the starting assist mode larger than the power supplied to the solenoid valve 80 in the normal starting mode. . Further, this configuration is effective when the solenoid valve 80 is fixed.

Further, in the normal starting mode, the power supplied from the generator 50 to the ignition device 32 is greater than the power supplied to the solenoid valve 80, so that the air-fuel mixture in the cylinder is easily ignited. Therefore, in the starting assist mode, the large electric power is preferentially supplied to the solenoid valve 80. Further, this configuration is effective when the solenoid valve 80 is fixed.

The chain saw 1A is a small and lightweight hand-held working machine in which the engine 30 is a two-stroke engine, and the fuel supply path 45 is provided with a manual pump P that can supply fuel to the solenoid valve 80.
In the chainsaw 1A, even when the power generation capacity of the generator 50 is small, such as in a small and lightweight hand-held work machine, the solenoid valve 80 can be opened with a small amount of electric power, so the startability of the engine 30 can be improved. . Further, this configuration is effective when the solenoid valve 80 is fixed.

In a two-stroke engine, oil is mixed with the fuel, so when the fuel evaporates while the engine 30 is stopped, the oil adheres to the valve element and the valve seat surface, and the oil causes the valve element to stick to the valve seat surface. In the chain saw 1A, the manual pump P can supply fuel to the solenoid valve 80 to melt the oil adhering to the valve body and valve seat surface.
In the chain saw 1A of the first embodiment, the startability of the engine 30 can be improved by the cooperation of the starting assist mode by the control device 100 and the manual pump P.

The starter device 60 of the chainsaw 1A is a recoil starter that has a rope 61 wound around the crankshaft 31 and rotates the crankshaft 31 by a tensile force applied to the rope 61.
In the chain saw 1A, even a recoil starter with a small power generation capacity can supply a large amount of electric power to the solenoid valve 80 in the starting assist mode by the control device 100, so that the startability of the engine 30 can be improved. Further, this configuration is effective when the solenoid valve 80 is fixed.

In the starting assist mode, after power is supplied to the solenoid valve 80, power is supplied from the generator 50 to the ignition device 32 at least once for each input to the starter device 60 from the outside. In this way, the engine 30 may be started by the first input to the starter device 60. Furthermore, at this time, even if the solenoid valve 80 is stuck, the engine 30 may start with the first input.

In the control device 100, when the starting assist mode is executed by external input to the starter device 60, at least one of the rotation amount, the total number of rotations, and the rotation speed of the crankshaft 31 may not reach a specified value. . In this case, the engine 30 can be reliably started by executing the starting assist mode in the control device 100 also at the time of the next input to the starter device 60 from the outside. Furthermore, with this configuration, a large amount of power can be reliably supplied to the solenoid valve 80 when the solenoid valve 80 is stuck.

In the control device 100, when the temperature of the engine 30 has not reached the specified value and the temperature is input to the starter device 60 from the outside, the start assist mode is executed. With this configuration, the startability of the engine 30 can be improved even when the temperature of the engine 30 is low. Further, this configuration is effective when the solenoid valve 80 is stuck.

Note that it is preferable that the temperature of the engine 30 be directly measured by the temperature sensor S to accurately measure the temperature of the engine 30.

Further, the control device 100 can execute other controls that control the driving of the engine 30, and can also use the temperature measured by the temperature sensor S for other controls.
For example, as another control in the control device 100, the sliding state of the piston with respect to the cylinder of the engine 30 can be detected based on the temperature of the temperature sensor S.
Further, as other control in the control device 100, cold start control or warm start control can be executed based on the temperature of the temperature sensor S.

In the chain saw 1A, a switch SW1 is provided between the solenoid valve 80 and the generator 50 to switch between a power supply state and a non-power supply state from the generator 50 to the solenoid valve 80.
In this configuration, a large amount of power can be supplied to the solenoid valve 80 by switching the switch SW1 from the non-power supply state to the power supply state after the generator 50 generates power. Further, this configuration is effective when the solenoid valve 80 is fixed.

Between the solenoid valve 80 and the generator 50, the chain saw 1A includes a power storage device 70 (power storage device) that is supplied with power from the generator 50, and a switch SW1 that switches between feeding and not feeding power from the power storage device 70 to the solenoid valve 80. and are provided.
In this configuration, a large amount of power can be supplied to the solenoid valve 80 by switching the switch SW1 from the non-power supply state to the power supply state after storing power in the power storage device 70. Further, this configuration is effective when the solenoid valve 80 is fixed.

Although an example of the first embodiment of the present invention has been described above, the present invention is not limited to the first embodiment, and can be modified as appropriate without departing from the spirit thereof. Further, depending on the case, the configurations of the second to fourth embodiments described later may be applied.
In the chainsaw 1A of the first embodiment, the control device 100 selects the starting assist mode or the normal starting mode based on the temperature of the engine 30 and the rotation of the crankshaft 31, but the control device 100 always selects the starting assist mode. It may be configured to run.

Although the starter device 60 of the chainsaw 1A of the first embodiment is a recoil starter, the crankshaft 31 may be rotated by driving a motor with a battery.

In the first embodiment, a chainsaw 1A to which the present invention is applied is described, but the power working machines to which the present invention can be applied are not limited to various power working machines such as brush cutters, hedge trimmers, blowers, etc. Applicable to machines.

[Second embodiment]
Next, a chainsaw according to a second embodiment of the present invention will be described. As shown in FIG. 5, the chain saw 1B of the second embodiment differs from the chain saw 1A of the first embodiment (see FIG. 2) in that power is supplied from a power storage device 70 to a solenoid valve 80. Furthermore, in the chain saw of the second embodiment, the timing at which power is supplied to the electromagnetic coil of the solenoid valve 80 in the starting assist mode is different from that in the starting assist mode of the first embodiment.
The chain saw of the second embodiment has the same structure as the chain saw 1A of the first embodiment (see FIG. 2) except for the control of the starting assist mode. Therefore, the constituent elements of the chain saw of the second embodiment are given the same reference numerals as the constituent elements of the chain saw 1A of the first embodiment. In addition, in the following description, reference is made to the time chart in FIG. 4 as appropriate.

In the control device 100 of the second embodiment, when the startup control mode is executed, as shown in FIG. Power is supplied to the solenoid valve 80 from 70.
In this manner, in the start control mode of the second embodiment, by storing a large amount of electric power in the power storage device 70 and supplying it to the solenoid valve 80, the solenoid valve 80 can more easily open.

Although an example of the second embodiment of the present invention has been described above, the present invention is not limited to the second embodiment, and as with the first embodiment, changes may be made as appropriate without departing from the spirit thereof. is possible.

[Third embodiment]
Next, a chainsaw 1B according to a third embodiment of the present invention will be described. As shown in FIG. 5, the chain saw 1B of the third embodiment differs from the chain saw 1A of the first embodiment (see FIG. 2) in that power is supplied from a power storage device 70 to a solenoid valve 80.

The generator 50 of the chainsaw 1B of the third embodiment is electrically connected to the power storage device 70 by a wiring C4. The power storage device 70 includes a capacitor (not shown) and the like for the ignition device 32 and the electromagnetic valve 80. Power is then supplied from the generator 50 to a plurality of capacitors, etc., and from the capacitors, etc., power is supplied to the electromagnetic valve 80 and the ignition device 32, respectively.
As a result, unless the switch SW2 for supplying power to the ignition device 32 is in the power supply state, the electric power supplied from the generator 50 to the ignition device 32 is also supplied to the capacitor for the solenoid valve 80 and the like.
In the above-described configuration, a switch (not shown) is provided between the generator 50 and the capacitor of the power storage device 70, and by turning the switch on and off, power is supplied to the power storage device 70 and to the electromagnetic coil of the solenoid valve 80. You may also do so.

Although an example of the third embodiment of the present invention has been described above, the present invention is not limited to the third embodiment, and as with the first embodiment, changes may be made as appropriate without departing from the spirit thereof. is possible.

[Fourth embodiment]
Next, a chain saw 1C according to a fourth embodiment of the present invention will be described. As shown in FIG. 6, the chainsaw 1C of the fourth embodiment differs from the chainsaw 1A of the first embodiment (see FIG. 2) in that it includes a first generator 51 and a second generator 52. There is.

In the chainsaw 1C of the fourth embodiment, the rotation of the crankshaft 31 causes the first generator 51 and the second generator 52 to generate electricity.
In the chainsaw 1C of the fourth embodiment, the first generator 51 is electrically connected to the power storage device 70 by the wiring C5. Further, the second generator 52 is electrically connected to the solenoid valve 80 by a wiring C6.

When the first generator 51 generates power, power is supplied from the first generator 51 to the power storage device 70, and power is supplied from the power storage device 70 to the ignition device 32. In other words, the power generated by the first generator 51 is supplied only to the ignition device 32.
Furthermore, when the second generator 52 generates electricity, power is supplied from the second generator 52 to the solenoid valve 80 . In other words, the power generated by the second generator 52 is supplied only to the solenoid valve 80.

In this way, by providing the first generator 51 that supplies power only to the solenoid valve 80, a large amount of power is reliably supplied to the solenoid valve 80, so it is possible to set the valve opening time to be longer as the starting assist mode. etc., the solenoid valve 80 becomes easier to open. Further, in this configuration, the second generator 52 and the switch SW1 may be connected by wiring not shown. By doing so, it is possible to set the electromagnetic valve 80 to utilize the electric power of the second generator 52 in the starting assist mode.

Although an example of the fourth embodiment of the present invention has been described above, the present invention is not limited to the fourth embodiment, and as with the first embodiment, changes may be made as appropriate without departing from the spirit thereof. is possible.

1A Chainsaw (first embodiment)
1B Chainsaw (third embodiment)
1C chainsaw (fourth embodiment)
10 Main body case 12 Top handle 13 Rear handle 20 Cutting section 21 Guide bar 22 Saw chain 30 Engine 31 Crankshaft 32 Ignition device 35 Rotation measuring device 40 Fuel tank 45 Fuel supply path 50 Generator 51 First generator 52 Second generator 60 Starter device 61 Rope 70 Power storage device 80 Solenoid valve 100 Control device P Manual pump S Temperature sensor SW1 Switch SW2 Switch

Claims (13)

working equipment and
an engine that drives the work implement;
a generator that generates electricity by rotation of the crankshaft of the engine;
a starter device that rotates the crankshaft by external input;
comprising a control device;
The fuel supply path connected to the engine is provided with a solenoid valve that opens when energized,
configured to supply power generated by the generator to an ignition device of the engine and to the solenoid valve;
When inputted to the starter device from the outside,
The control device includes:
It is possible to execute a starting assist mode in which at least a part of the power generated by the generator is fed from the generator to the ignition device with priority to the solenoid valve, and
A normal starting mode can be executed in which power generated by the generator is supplied to the ignition device and the solenoid valve,
The electric power supplied to the solenoid valve in the starting assist mode is:
A power working machine characterized in that the electric power is greater than the electric power supplied to the solenoid valve in the normal starting mode . The power working machine according to claim 1,
The engine is a two-stroke engine,
A power working machine characterized in that the fuel supply path is provided with a manual pump capable of supplying fuel to the electromagnetic valve. The power working machine according to claim 2,
The power working machine is characterized in that the starter device is a recoil starter that has a rope wound around the crankshaft and rotates the crankshaft by a tensile force applied to the rope. The power working machine according to claim 1 ,
The power working machine is characterized in that in the normal starting mode, the power supplied from the generator to the ignition device is greater than the power supplied to the solenoid valve. The power working machine according to any one of claims 1 to 4 ,
In the starting assist mode, after power is supplied to the solenoid valve, power is supplied from the generator to the ignition device at least once in response to one input from the outside to the starter device. work equipment. The power working machine according to any one of claims 1 to 5 ,
The control device includes:
When the starting assist mode is executed by an input from the outside to the starter device,
If at least one of the rotation amount, the total number of rotations, and the rotation speed of the crankshaft does not reach a specified value,
The power working machine is characterized in that the starting assist mode is executed also at the time of the next input from the outside to the starter device. The power working machine according to any one of claims 1 to 6 ,
The control device includes:
The power working machine is characterized in that, when the temperature of the engine has not reached a specified value, the starting assist mode is executed when input from the outside to the starter device. The power working machine according to claim 7 ,
A power working machine characterized in that the temperature of the engine is directly measured by a temperature sensor. The power working machine according to claim 8 ,
The control device includes:
It is possible to perform other controls for controlling the drive of the engine,
A power working machine characterized in that the temperature measured by the temperature sensor is also used for the other controls. The power working machine according to claim 9 ,
The power working machine is characterized in that, in the other control in the control device, a sliding state of a piston with respect to a cylinder of the engine is detected based on the temperature of the temperature sensor. The power working machine according to claim 9 ,
The power working machine is characterized in that, in the other control in the control device, cold start control or warm start control is executed based on the temperature of the temperature sensor. The power working machine according to any one of claims 1 to 11 ,
Between the solenoid valve and the generator,
A power working machine characterized in that a switch is provided for switching between a power supply state and a non-power supply state from the generator to the solenoid valve. The power working machine according to any one of claims 1 to 11 ,
Between the solenoid valve and the generator,
a power storage device supplied with power from the generator;
A power working machine, comprising: a switch that switches between a power supply state and a non-power supply state from the power storage device to the solenoid valve.

Images