JP2016220604A - Portable engine-driven working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To notify an operator of a maintenance timing before a function of an actuator operated by the output of a control unit deteriorates.SOLUTION: A portable engine-driven working machine 1 includes: an engine 2 started by an operation of a recoil starter 4; a working unit 3 driven by the engine 2; and a control unit 10 operated by the electric power supply from a generator 5 that generates electric power by the drive of the engine 2 or the operation of the recoil starter 4 that executes control to stop the engine 2 by a stop signal in an emergency. The control unit 10 includes an operation frequency counting part 13 for counting and storing an emergency stop operation frequency, a maintenance determination part 14 for comparing the operation frequency stored by the operation frequency counting part 13 with a set frequency at the start of the operation, and determining a maintenance timing, and a maintenance notification part 15 for causing notification means 7 that notifies of needs of maintenance to be operated according to the result of determination by the maintenance determination part 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a portable engine-driven work machine having a maintenance notification function.

  Portable work machines that drive the working part with the power of the small engine installed (portable engine-driven work machines) are known for various types of work machines such as brush cutters, chain saws, hedge trimmers, blowers, and sprayers. Yes.

  Among such portable engine-driven work machines, those that electronically control the operation of the engine are known. The portable engine-driven work machine includes a power generator (power generation coil) that generates electric power by operating a recoil starter or driving the engine, and includes a control unit that operates by feeding power from the power generator (see Patent Document 1 below). .

  An example of electronic control in a portable engine-driven work machine is an emergency stop of the engine, and the control unit stops the ignition of the engine or reduces the engine speed by a stop signal generated by an output of an acceleration sensor or the like. Control is performed to detect and apply braking by the electromagnet brake mechanism to the output side clutch drum of the centrifugal clutch that transmits the driving force of the engine to the working unit side.

JP2012-152109A

  The portable engine-driven work machine including the control unit described above can perform highly safe work by stopping the engine in an emergency. At this time, among the actuators that are operated by the output of the control unit, there are some actuators whose functions are deteriorated, such as the above-described electromagnetic brake mechanism, because the contact portion is worn by repeated operations. In response to this, if the operator can recognize the deterioration of the function, the function can be recovered by maintenance such as replacement of parts. However, after the function has deteriorated to the extent that the operator can recognize it, it is already safe. There is a problem that it is difficult to ensure the safety and the maintenance time is too late. In addition, even though the function is clearly deteriorated, the worker may continue to use the work machine without noticing, and a countermeasure for avoiding such a situation has been demanded.

  This invention makes it an example of a subject to cope with such a problem. That is, in a portable engine-driven work machine equipped with a control unit that electronically controls the engine, the maintenance time can be notified to the operator before the function of the actuator that operates according to the output of the control unit deteriorates. Obviously, it is an object of the present invention to prevent the operator from continuing to use the working machine without realizing it even though the function of the actuator is obviously deteriorated.

In order to achieve such an object, a portable engine-driven work machine according to the present invention has the following configuration.
The engine is started by the operation of the recoil starter, the working unit driven by the engine, and the power generation from the generator driven by the engine or the operation of the recoil starter is operated, and the engine is stopped by a stop signal. A control unit that counts and stores the number of operations of the stop signal, and sets the number of operations stored by the operation count unit when the operation of the control unit starts. A portable engine drive comprising: a maintenance determination unit that determines a maintenance time compared to a maintenance determination unit; and a maintenance notification unit that operates a notification unit that notifies the necessity of maintenance based on a determination result of the maintenance determination unit Work machine.

  The portable engine-driven work machine of the present invention has such a feature, so that the maintenance time can be notified to the operator before the function of the actuator that operates according to the output of the control unit is lowered at the time of stoppage. It is possible to ensure work safety. Further, it is possible to prevent the operator from continuing to use the work implement without noticing it despite the fact that the function of the actuator is obviously lowered.

It is explanatory drawing which showed the structure of the portable engine drive working machine which concerns on embodiment of this invention. It is explanatory drawing which showed the specific structural example of the portable engine drive working machine which concerns on embodiment of this invention. It is explanatory drawing which showed the operation | movement flow of the control unit in the structural example shown in FIG. It is explanatory drawing which showed the example of the concrete control circuit which comprises a control unit. It is explanatory drawing (overall view) which showed the brush cutter which is an example of a portable engine drive working machine. It is explanatory drawing (cross-sectional view of a drive part) which showed the brush cutter which is an example of a portable engine drive working machine.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a portable engine-driven work machine 1 according to an embodiment of the present invention includes an engine 2 that is started by operating a recoil starter 4, a working unit 3 that is driven by the engine 2, and driving of the engine 2. Alternatively, it includes a control unit 10 that operates by feeding power from a generator (power generation coil) 5 that generates power by operating the recoil starter 4 and controls the engine 2 to stop by an emergency stop signal, for example.

  The control unit 10 includes, as a function for controlling the stop of the engine 2 by a stop signal, an ignition control unit 11 for setting the ignition plug 2A of the engine 2 to a misfire mode by the stop signal, and an actuator 6 for stopping the operation of the working unit 3. An actuator operating unit 12 is provided for operation.

  In addition, the control unit 10 counts and stores the number of operations of the actuator 6, and compares the number of times stored by the operation number count unit 13 with the set number of times when the operation of the control unit 10 starts. A maintenance determination unit 14 that determines the timing and a maintenance notification unit 15 that operates the notification means 7 that notifies the necessity of maintenance based on the determination result of the maintenance determination unit 14 are provided. In addition, the control unit 10 includes a count reset unit 16 that resets the number of operations stored in the operation number counting unit 13.

  In FIG. 1, broken lines indicate mechanical connections between the respective parts, and solid lines indicate electrical connections between the respective parts. The parentheses indicate the functional configuration executed by a circuit or program provided in the control unit 10.

  The control unit 10 of the portable engine-driven work machine 1 operates by supplying power from the generator 5, stops operating when the engine 2 is stopped, and is supplied with power from the generator 5 by operating the recoil starter 4. The operation starts with. During the operation of the control unit 10 (that is, when the engine is driven), the ignition control unit 11 functions by the generation of the stop signal to put the spark plug 2A into the misfire mode. The stop signal is generated by input from various emergency stop devices, for example, input from a manual switch operated by an operator or detection input by various sensors (impact detection by an acceleration sensor or centrifugal clutch off detection by a rotation speed sensor). Etc.)

  The actuator operation unit 12 of the control unit 10 has a function of operating the actuator 6 when the engine 2 is stopped by the stop signal described above. The actuator 6 is directly operated by the stop signal or the engine 2 is stopped by the stop signal. The actuator 6 is operated along with the above.

  The operation count section 13 of the control unit 10 counts the number of operations of the actuator 6 directly or indirectly, and counts the number of times of generation of a stop signal, the number of times of generation of an output signal for operating the actuator 6, and the like. The number of operations is stored in the storage means. The storage means here is a non-volatile memory, and even if the engine 2 is stopped and the control unit 10 is in a non-operating state after counting by the operation number counting unit 13, the cumulative number of operations stored in the storage means is retained. Is done.

  The maintenance determination unit 14 of the control unit 10 functions when the operation of the control unit 10 starts. That is, the maintenance determination unit 14 functions immediately after power is supplied from the power generator 5 to the control unit 10 by operating the recoil starter 4 from the stopped state of the engine 2. The maintenance determination unit 14 compares the cumulative number of operations by the number-of-operations count unit 13 stored in the storage unit at that time with the set number of times stored in the storage unit as a preset value, and the total number of operations Is equal to the set number of times, or when the cumulative number of operations exceeds the set number of times, a determination result indicating that it is a maintenance time is output. The number of times set here is set based on the number of times the actuator 6 is used, and the number of times that sufficient safety is ensured.

  The maintenance notification unit 15 of the control unit 10 operates the notification unit 7 when it is determined that it is the maintenance time based on the determination result of the maintenance determination unit 14. The notification means 7 may be any means that can notify the operator of the necessity of maintenance visually, audibly or tactilely. For example, a means for generating flashing light, buzzer sound, vibration of the handle, etc. is adopted. can do.

  The count reset unit 16 of the control unit 10 is a function that is used after maintenance such as parts replacement for the actuator 6 is completed. By performing a manual operation on the control unit 10, storage of the nonvolatile memory is possible. The cumulative number of operations stored in the means is reset to zero.

  FIG. 2 shows a more specific configuration example of the portable engine-driven work machine 1. This example is provided with a trimming work unit 30 as the above-described working unit, and is provided with a centrifugal clutch 20 that transmits the driving force of the engine 2 to the mowing work unit 30 side. In addition, an electromagnet brake mechanism 60 is provided as the actuator described above, and an acceleration sensor 8 for detecting an impact and a rotation speed sensor 9 for detecting the rotation speed of the engine 2 are provided as stop signal input means. And as a notification means, the light emitting element (LED) 70 which notifies an operator by blinking of light is provided.

  The portable engine-driven work machine 1 shown in FIG. 2 generates a stop signal when an impact that should be urgently stopped is detected by the output of the acceleration sensor 8 when the engine 2 is driven, and the ignition control unit 11 of the control unit 10. Functions to put the spark plug 2A into the misfire mode. Further, when the engine speed is decreased by the stop control of the engine 2 by the ignition control unit 11, the rotation speed sensor 9 detects the rotation speed of the engine 2 and reaches a predetermined rotation speed at which the centrifugal clutch 20 is not transmitted. At that time, the actuator operation unit 12 of the control unit 10 functions to operate the electromagnet brake mechanism 60. The electromagnet brake mechanism 60 attracts the core (braking element) to the output-side clutch drum of the centrifugal clutch 20 and stops the inertial rotation of the mowing working unit 30.

  FIG. 3 shows an operation flow of the control unit 10 in the configuration example shown in FIG. When the engine 2 is started by operating the recoil starter 4 from the stopped state of the engine 2, the control unit 10 starts to operate (S1). The control unit 10 first checks whether or not the count reset unit 16 is operated (S2). If the count reset unit 16 is operated (S2: YES), the LED 70 is displayed in a special lighting pattern. Then, the operation count of the storage means is reset to zero (S3). Thereafter, the ignition control unit 11 is caused to function, and engine stop control for setting the spark plug 2A to the misfire mode is performed (S4).

  When the control unit 10 starts to operate (S1) and the count reset unit 16 is not operated (S2: NO), the maintenance determination unit 14 functions. In this example, the maintenance determination unit 14 includes a first set number (for example, 3000 times) and a second set number (for example, 5000 times) larger than the first set number as the set number. 15 is a first-stage notification based on a comparison with the first set number of times of the maintenance determination unit 14, and a second-stage notification is performed based on a determination based on the comparison with the second set number of times of the maintenance determination unit 14.

  Specifically, first, it is determined whether or not the number of operations stored in the storage means is equal to or less than the second set number (S5). If the number of operations exceeds the second set number (S5: NO), the LED 70 is blinked at high speed as the second stage notification, and then engine stop control in the misfire mode is performed (S6). If the number of operations is less than or equal to the second set number (S5: YES), it is further determined whether or not the number of operations stored in the storage means is less than or equal to the first set number (S7). When the number of operations exceeds the first set number (S7: NO), the LED 70 is blinked (slow blinking) to perform the first stage notification.

  In the notification of the first stage, when the engine 2 is in operation (S10: NO) and the impact is not detected by the acceleration sensor 8 (S11: NO), the driving of the engine 2 is continued. When the engine 2 is stopped due to human or fuel shortage (S10: YES), the power supply to the control unit 10 is cut off due to the stop of the engine 2, so that the control unit 10 ends its operation (S15).

  When the engine 2 is continuously driven (S11: NO) and an impact is detected by the output of the acceleration sensor 8 (S11: YES), a stop signal is generated and the ignition control unit 11 functions. Then, engine stop control in the misfire mode is performed (S12). Thereafter, when the rotational speed of the engine 2 decreases and the rotational speed detected by the rotational speed sensor 9 becomes equal to or lower than a set rotational speed (for example, 3700 rpm) (S13: YES), the actuator operation unit 12 functions and the electromagnetic brake The mechanism 60 is activated, and the operation number counting unit 13 functions to count the operation number and store the accumulated operation number in the storage means (S14), and the operation of the control unit 10 is terminated when the engine 2 is stopped. (S15).

  According to the operation flow of the control unit 10 as described above, when the number of operations of the electromagnetic brake mechanism 60 increases and exceeds the first set number of times, the step of S7 in FIG. The first stage notification is made by the blinking of the LED 70. Thus, the operator can recognize the maintenance time of the electromagnet brake mechanism 60 before a significant deterioration in the function of the electromagnet brake mechanism 60 occurs.

  Further, when maintenance is not performed in this first stage notification and the portable engine drive work machine 1 is continuously used, if the number of operations of the electromagnetic brake mechanism 60 further increases and exceeds the second set number, the recoil When the engine is started by operating the starter 4, the determination in step S 5 in FIG. 3 is “NO”, and a second-stage notification is made by rapidly blinking the LED 70. When the notification in the second stage is made, engine stop control in the misfire mode of the ignition control unit 11 is executed, and continuous driving of the engine 2 is prevented. Thereby, the situation where the portable engine drive working machine 1 is continuously used can be avoided without the electromagnet brake mechanism 60 being maintained.

  Then, by performing the first stage notification and the second stage notification in two stages, the maintenance time can be recognized first by the first stage notification. From the first stage notification to the second stage notification, safety can be ensured and it can be used for a certain period with the maintenance time in mind.

  In addition, although the example which sets the 1st setting frequency | count and the 2nd setting frequency | count is shown in the operation | movement flow shown in FIG. 3, determination of a maintenance time is performed only by the 1st setting frequency | count, In that case, FIG. Similarly to step S6, the engine stop control by the misfire mode of the ignition control unit 11 may be performed.

  FIG. 4 shows a specific control circuit example constituting the control unit 10. The control unit 10 is connected to a power generation circuit of the power generator 5 including the power generation winding 50, a drive circuit of the electromagnet brake mechanism 60, a drive circuit of the light emitting element 70, and the acceleration sensor 8 as illustrated. The control unit 10 includes a main control IC 10A that functions as an input circuit for the acceleration sensor 8, a lighting output circuit for the light emitting element 70, a misfire output circuit for the ignition control unit 11, an engine pulse input circuit, a drive circuit for the electromagnetic brake mechanism 60, and the like. A reset IC 10 </ b> B that causes the count reset unit 16 to function is provided. The control unit 10 also includes a regulator 10D for adjusting the voltage applied to the acceleration sensor 8 and a regulator 10E for setting the drive voltage of the main control IC.

  The main control IC 10A includes six I / O ports, where port 1 (GP0 in the figure) is a stop signal input port from the acceleration sensor 8, port 2 (GP1 in the figure) is an output port for lighting the light emitting element 70, Port 3 (GP2 shown) is an output port to the ignition control unit 11, port 4 (GP3 shown) is a GND port, port 5 (GP4 shown) is an engine pulse input port, and port 6 (GP5 shown) is an electromagnetic brake mechanism 60. Each output port has become. The reset ICs 10B and 10C have three ports P1, P2 and P3, respectively. P1 is a power port, P2 is an output port, and P3 is a GND port.

  In this circuit example, the control unit 10 includes a reset terminal 10 </ b> F for operating the count reset unit 16. When the power is supplied from the power generator 5 with the terminals connected, the reset terminal 10F is operated every time the stop signal from the acceleration sensor 8 is input to the port 1 (GP0 in the drawing) port 13. Counts up, and when power is supplied from the generator 5 in a state where the terminals of the reset terminal 10F are not connected as shown in the figure, the count reset unit 16 operates to reduce the cumulatively counted value to zero. Reset to.

  Specifically, the operation of the reset ICs 10B and 10C is such that when the input of the power supply port P1 is 0 V to 0.8 V or 4 V or more, the output port P2 is set to HI (open) and the input of the power supply port P1 is set to 0. When the voltage is 8V to 4V, the output port P2 is set to LOW (GND). As a result, the reset ICs 10B and 10C convert the analog waveform input signal accompanying the rotation of the engine input by driving the power generator 5 into a square waveform (pulse signal) and output it.

  When the terminals of the reset terminal 10F are connected, as described above, a pulse signal obtained by converting an analog waveform according to the engine speed into a square waveform is output from the output port P2 of the reset IC 10B. A signal is input to port 5 (GP4 in the figure) of the main control IC. The main control IC detects the number of revolutions of the engine based on the input pulse signal, and operates the operation number counting unit 13 described above in a state where the number of revolutions of the engine is detected.

  On the other hand, if the terminals of the reset terminal 10F are not connected, the input to the power supply port P1 of the reset IC 10B does not fluctuate at 0V, so the output of the reset IC 10B remains HI and is input. The output port P2 of the reset IC 10B does not output a pulse signal for the analog waveform. The main control IC 10A detects that no pulse signal is input to the port 5 (GP4 in the figure) even though power is supplied from the generator 5 by driving the engine, and operates the count reset unit 16 to reset the accumulated count. In addition, after executing a flashing pattern peculiar to resetting, the ignition control unit 11 performs misfire control to stop the engine. It should be noted that normal ignition is performed from the next start.

  As described above, the control unit 10 can operate the count reset unit 16 by disconnecting the reset terminal 10F. Therefore, after the maintenance is completed, the count reset can be performed without connecting a special device to the control unit 10. The part 16 can be operated.

  5 and 6 show a brush cutter 100 as an example of the portable engine drive working machine 1 according to the embodiment of the present invention (FIG. 5 is an overall view, and FIG. 6 is a cross-sectional view of the drive unit). 6 (a) shows the entire drive unit, and FIG. 6 (b) shows the structure of the centrifugal clutch. The mower 100 includes a drive unit 110, an operation tube 101 having one end connected to the drive unit 100, and a mowing work unit 30 provided at the distal end of the operation tube 101. A portable work can be performed with the attached handle 102.

  A small engine 2 is mounted on the drive unit 110, and the engine 2 is covered with an engine cover 111. A fuel tank 112 is provided below the engine 2. On the output shaft (crankshaft) 2B of the engine 2, the centrifugal clutch 20 is mounted on one side to which the operation tube 101 is connected, and the recoil starter 4 is mounted on the other side. The recoil starter 4 is housed in a recoil case 113, and a control unit 10 including an acceleration sensor 8 and a rotation speed sensor 9 (not shown) is disposed in the recoil case 113.

  The centrifugal clutch 20 is provided in the clutch cover 115, and the output shaft 2 </ b> B of the engine 2 and the transmission shaft 116 that transmits power to the cutting blade 31 of the brushing working unit 30 are connected via the centrifugal clutch 20. ing. In the clutch cover 115, an electromagnet brake mechanism 60 acting on the clutch drum of the centrifugal clutch 20 and a capacitor 114 serving as a power source for driving the electromagnet brake mechanism 60 are provided. The capacitor 114 stores electric power generated by a generator (power generation coil) (not shown) when the engine 2 is driven.

  Such a brush cutter 100 operates the recoil starter 4 to start the engine 2 and operates the throttle lever 103 mounted on the handle 102 while rotating the cutting blade 31 by the driving force of the engine 2. The mowing work is done with. At this time, as described above, the operation of the control unit 10 is started by the operation of the recoil starter 4 and the operation flow shown in FIG. 3 is executed. The notification means 7 (for example, the light emitting element (LED) 70) not shown in FIGS. 5 and 6 is preferably provided around the recoil case 113. Thus, when the operator operates the recoil starter 4, the light emitting element (LED) 70 sees the blinking state, and clearly grasps the necessity of maintenance for the electromagnetic brake mechanism 60 by the blinking state. Can do.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. In particular, in the embodiment, the maintenance time notification of the electromagnet brake mechanism 60 is described as an example. However, the present invention is not limited to this, and the maintenance time notification is similarly applied to any actuator that is repeatedly operated by the output of the control unit 10. Can be combined with engine stop control.

1: Portable engine-driven work machine,
2: engine, 2A: spark plug, 2B: output shaft (crankshaft),
3: working part, 4: recoil starter, 5: generator, 50: winding for power generation,
6: Actuator, 7: Notification means, 8: Acceleration sensor, 9: Speed sensor,
10: Control unit, 10A: Main control IC,
10B, 10C: IC for reset, 10D, 10E: Regulator,
10F: Reset terminal,
11: Ignition control unit, 12: Actuator operation unit,
13: Operation frequency counting unit, 14: Maintenance determination unit,
15: Maintenance notification part, 16: Count reset part,
20: Centrifugal clutch,
30: Mowing operation part, 31: Cutting blade,
60: Electromagnetic brake mechanism, 70: Light emitting element (LED)
100: Mower, 101: Operation tube, 102: Handle,
103: throttle lever, 110: drive unit, 111: engine cover,
112: Fuel tank, 113: Recoil case, 114: Capacitor,
115: Clutch cover, 116: Transmission shaft

The main control IC10A is, I / O port includes 6 ports, Port 1 input port (shown a) the stop signal from the acceleration sensor 8, port 2 for lighting output port (shown b) light-emitting element 70, Port 3 (illustrated c ) is an output port to the ignition controller 11, port 4 (illustrated d ) is a GND port, port 5 (illustrated e ) is an engine pulse input port, and port 6 (illustrated f ) is an electromagnetic brake mechanism 60. Each output port has become. The reset ICs 10B and 10C have three ports P1, P2 and P3, respectively. P1 is a power port, P2 is an output port, and P3 is a GND port.

In this circuit example, the control unit 10 includes a reset terminal 10 </ b> F for operating the count reset unit 16. Reset terminal 10F, when the power supply from the generator 5 while connecting the terminals is made, every time a stop signal from the acceleration sensor 8 is input to the port 1 (shown a) port, the operation number count section 13 Counts up, and when power is supplied from the generator 5 in a state where the terminals of the reset terminal 10F are not connected as shown in the figure, the count reset unit 16 operates to reduce the cumulatively counted value to zero. Reset to.

When the terminals of the reset terminal 10F are connected, as described above, a pulse signal obtained by converting an analog waveform according to the engine speed into a square waveform is output from the output port P2 of the reset IC 10B. The signal is input to port 5 ( e in the figure) of the main control IC. The main control IC detects the number of revolutions of the engine based on the input pulse signal, and operates the operation number counting unit 13 described above in a state where the number of revolutions of the engine is detected.

On the other hand, if the terminals of the reset terminal 10F are not connected, the input to the power supply port P1 of the reset IC 10B does not fluctuate at 0V, so the output of the reset IC 10B remains HI and is input. The output port P2 of the reset IC 10B does not output a pulse signal for the analog waveform. The main control IC 10A detects that no pulse signal is input to the port 5 ( e in the figure) even though power is supplied from the generator 5 by driving the engine, and operates the count reset unit 16 to reset the accumulated count. In addition, after executing a flashing pattern peculiar to resetting, the ignition control unit 11 performs misfire control to stop the engine. It should be noted that normal ignition is performed from the next start.

Claims (8)

An engine (2) started by operation of the recoil starter (4);
A working part (3) driven by the engine (2);
A control unit (10) that operates by supplying power from a generator (5) that generates electric power by driving the engine (2) or operating the recoil starter (4), and stopping the engine (2) by a stop signal; Prepared,
The control unit (10)
An operation number counting unit (13) for counting and storing the number of operations of the stop signal;
A maintenance determination unit (14) that determines the maintenance time by comparing the number of operations stored in the operation number counting unit (13) with a set number of times at the start of operation of the control unit (10);
A portable engine-driven work machine (1), comprising: a maintenance notification unit (15) for operating a notification means (7) for notifying the necessity of maintenance based on a determination result of the maintenance determination unit (14). . The maintenance determination unit (14) includes, as the set number of times, a first set number of times and a second set number of times greater than the first set number of times,
The maintenance notification unit (15) performs a first stage notification by comparison with the first set number of times of the maintenance determination unit (14), and the second set number of times of the maintenance determination unit (14). The portable engine-driven work machine (1) according to claim 1, wherein the notification of the second stage is performed by the determination based on the comparison.   The portable engine-driven work machine (1) according to claim 1 or 2, wherein the control unit (10) controls the engine (2) to stop according to a determination result of the maintenance determination unit (14). . A centrifugal clutch (20) for transmitting the driving force of the engine (2) to the working part (3) side;
The control unit (10)
The portable engine drive according to any one of claims 1 to 3, wherein an electromagnetic brake mechanism (60) that is attracted to an output side of the centrifugal clutch (20) is operated when the engine is stopped by the stop signal. Work machine (1).   The portable engine-driven work machine (1) according to any one of claims 1 to 4, wherein the stop signal is generated by an output of an acceleration sensor (8).   The said control unit (10) is provided with the count reset part (16) which resets the operation frequency which the said operation frequency count part (13) memorize | stored, The any one of Claims 1-5 characterized by the above-mentioned. Portable engine-driven work machine (1).   The portable engine-driven work machine according to claim 6, wherein the count reset unit (16) is operated by disconnecting a reset terminal (10F) in the control unit (10). 1).   The portable engine-driven work machine (1) according to any one of claims 1 to 7, wherein the working part (3) is a mowing work part (30).

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