JP2004098899A - Anti-theft device of working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-theft device of working machine capable of further surely preventing a theft even when the installation of an anti-theft mechanism is detected. <P>SOLUTION: This anti-theft device of a working machine device has an engine 12 that is a power source for traveling the working machine 1 and the anti-theft mechanism 44 permitting the starting of the engine 12 in the starting operation of the engine 12 by use of a regular engine key 36 and disabling the starting of the engine 12 in the starting operation of the engine 12 by use of an irregular engine key 36 other than the regular engine key 36. The anti-theft mechanism 44 is constituted so as to detect the use of the irregular engine key 36 and output an irregular signal S2. This device further comprises a working machine control means inputting the irregular signal S2 of the mechanism 44 to disable the general traveling of the working machine 1. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an anti-theft device for a working machine such as a backhoe that makes it impossible to start an engine with an unauthorized engine key.
[0002]
[Prior art]
Conventionally, as a vehicle anti-theft device, as a technology that makes it impossible to start the engine with an irregular engine key, only when the ID code incorporated in the engine key matches the ID code recorded on the vehicle side, There are some which enable the engine to be started (for example, see Patent Documents 1 to 4). In this case, even if a duplicate key is created, the ID code will not match, so that the automobile engine cannot be started.
[0003]
On the other hand, there is a working machine such as a backhoe exemplified as a turning working machine equipped with an engine serving as a power source for running the working machine, and this type of working machine also has a similar anti-theft mechanism as that of a vehicle. It is conceivable that the engine is started when the engine is operated with a regular engine key, and the engine is started when the engine is operated with an irregular engine key. Can be disabled.
[0004]
[Patent Document 1]
JP 2001-146148 A
[Patent Document 2]
JP-A-10-82223
[Patent Document 3]
JP-A-10-129421
[Patent Document 4]
JP-A-2000-335370
[0005]
[Problems to be solved by the invention]
However, if the anti-theft mechanism incorporated in the work machine is discovered and the starter position of the main switch and the starter are connected by an electric wire or the like and short-circuited so that the anti-theft mechanism does not intervene, the anti-theft mechanism will not function. And it became difficult to prevent theft.
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an anti-theft device for a working machine that can reliably prevent theft even when the incorporation of the antitheft mechanism is broken.
[0006]
[Means for Solving the Problems]
The technical means of the present invention for solving this technical problem includes the engine 12 serving as a power source for running the work machine 1, and when the engine 12 is started with a regular engine key 36, the engine 12 is operated. In an anti-theft device for a working machine provided with an anti-theft mechanism 44 for disabling the start of the engine 12 when the engine 12 is started using the irregular engine key 36 while allowing the start,
The anti-theft mechanism 44 is configured to detect when an unauthorized engine key 36 is used and to output an unauthorized signal S2. In addition, there is provided a working machine control means for making the working machine 1 unable to travel normally.
[0007]
Another technical means of the present invention is that the anti-theft mechanism 44 checks the ID code of the engine key 36 and turns on a starter switch 46 interposed between the power supply 33 and the starter 34 when the check is established. Then, the start of the engine 12 is permitted, and the immobilizer control unit 43 that disables the start of the engine 12 by holding the starter switch 46 off when the collation is not established is provided.
Another technical measure of the present invention is to provide an AI control system that keeps the rotation of the engine 12 at idling when the plurality of operation levers 62 are all set to the neutral position. The work machine control means is provided with a function of holding the rotation of the engine 12 at the idling rotation by inputting S2.
[0008]
Another technical means of the present invention is to stop the operation of the working device 6 by inputting the irregular signal S2 of the anti-theft mechanism 44 to an interference avoidance system that controls the working device 6 so as not to enter the interference area. And the work machine control means is configured.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, a backhoe 1 exemplified as a turning work machine has a turning table 4 supported on a traveling machine base 3 having crawler running devices 2 on the left and right so as to freely turn around a vertical axis. The lower portion of the backhoe device (working device) 6 is supported by the backhoe support portion 5.
An operating unit 7 is formed on the swivel base 4 on the left side of the backhoe support unit 5, and a sunshade device 8 for partitioning the backhoe device 6 and covering the operating unit 7 is mounted on the swivel table 4, and on the right side of the backhoe support unit 5. A fuel tank, an oil tank, and the like are arranged, and a pipe supporting frame and the engine 12 are mounted on the rear side of the fuel tank and the oil tank. The periphery of the fuel tank and the oil tank is covered with a main body cover 13 and the upper part is covered with a protective cover, and the engine 12 is arranged sideways. Surrounded by
[0010]
The backhoe device 6 has a boom 19 whose base is supported by the backhoe support portion 5 via a boom pivot shaft 17 and which moves up and down via a boom cylinder 18, and a tip end of the boom 19 which is supported via an arm pivot shaft 20. Arm 22 bent and extended via an arm cylinder 21, and a bucket (working tool) 25 supported at the tip of the arm 22 via a bucket pivot 23 and raked and discharged via a bucket cylinder 24. Having.
The boom 19 includes a main boom 19A supported by a boom pivot 17, an intermediate boom 19B connected to the tip of the main boom 19A via an intermediate support shaft 28 so as to be swingable about a vertical axis, A tip boom 19C is connected to the tip of the tip 19B via a tip support shaft 29 so as to be swingable about the longitudinal axis. An offset cylinder 30 is provided between the main boom 19A and the intermediate boom 19B, and the main boom 19A and the tip boom 19C are connected by an interlocking link for forming a parallel quadruple link. The tip boom 19C, the arm 22, and the bucket 25 are offset to the left and right with respect to the main boom 19A.
[0011]
The backhoe 1 drives a plurality of hydraulic pumps 26 by the engine 12 to supply oil in an oil tank to a hydraulic motor of the left and right crawler traveling device 2 and a turning hydraulic motor via a control valve group. Various actuators such as the hydraulic cylinders 18, 21, 24, 30 and the hydraulic cylinder for the dozer can be appropriately supplied. Therefore, the engine 12 is a power source for running the work machine and a power source for operating various hydraulic devices.
2 and 3 show the configuration of an electric control system for starting the engine and the configuration of the anti-theft device. 2 and 3, reference numeral 33 denotes a battery (power supply), reference numeral 34 denotes a starter, reference numeral 35 denotes a main switch, and an engine key 36 is inserted to move from an off position (OFF) to an on position (ON) and a start position (START). When the engine key 36 is inserted, the main switch 35 is set to the start position, and the hand is released from the engine key 36, the main switch 35 returns to the on position by the force of the spring. It is configured. Further, when the main switch 35 is set at the start position, the starter 34 is connected to the battery 33 via the main switch 35.
[0012]
A transponder chip 37 is embedded in the head of the engine key 36. An ID code unique to the backhoe (working machine) 1 is recorded on the transponder chip 37. The backhoe 1 is provided with an anti-theft mechanism 44 having an antenna 41, an amplifier 42, and an immobilizer control unit 43.
When the engine key 36 is inserted into the key cylinder 35a of the main switch 35 and rotated, the antenna 41 receives an ID code transmission signal from the transponder chip 37 of the engine key 36, and the amplifier 42 receives the signal from the antenna 3 The amplified signal is amplified, and the signal from the amplifier 42 is input to the immobilizer control unit 43.
[0013]
An ID code is recorded in the immobilizer control unit 43. The ID code is collated with the ID code of the engine key 36. When the collation is established, a starter switch interposed between the battery 33 and the starter 34 is provided. By turning on 46, the start of the engine 12 is permitted, and when the collation is not established, the starter switch 46 is kept off to disable the start of the engine 12. In addition, when the ID code of the engine key 36 is collated, the immobilizer control unit 43 outputs a collation signal S (regular signal S1 and irregular signal S2) to the AI control unit 51 and the interference avoidance control unit 71 described later. It has become.
[0014]
That is, when the collation is established, the normal signal S1 (collation signal S) indicating that the regular engine key 36 is used is output to the AI control unit 51 and the interference avoidance control unit 71, and the collation is not established. At this time, an irregular signal S2 (collation signal S) indicating that the irregular engine key 36 has been used is output to the AI control unit 51 and the interference avoidance control unit 71.
FIG. 4 and FIG. 5 show the configuration of an auto idle (AI) control system provided in the backhoe (working machine) 1. As shown in FIGS. 4 and 5, the AI control system includes an AI control unit 51 including a CPU, an AI motor 54 that changes a governor position of a governor lever 53 via an accelerator cable 52, an accelerator sensor 55, An AI pressure switch 57 and a governor sensor 58 for detecting the governor position of the governor lever 53 are provided.
[0015]
The accelerator sensor 55 is attached to the fulcrum of the accelerator lever 61, detects the position of the accelerator lever 61 as a rotation angle by a potentiometer, and outputs a detection signal indicating the accelerator position of the accelerator lever 61 to the AI control unit 51. Has become.
The AI pressure switch 57 is normally closed (usually a contact is turned on) as a switch characteristic, and is turned on when all of the operation levers 62 are set to the neutral position, as described later. When the switch 62 is operated from the neutral position to the working state, the switch is turned off.
[0016]
The operation lever 62 is provided, for example, in a pair of left and right on the driving unit 7 and the like, and by operating one of the operation levers 62 from the neutral position to the front, rear, left and right, etc. The bending and stretching operations, the scraping and discharging operations of the bucket 25, and the like are performed via the boom cylinder 18, the arm cylinder 21, the bucket cylinder 24, the offset cylinder 30, and the like. Further, each operation lever 62 may be used to operate the traveling speed and direction of the backhoe 1.
[0017]
Each of the operation levers 62 is connected to one or more control valves 64 via a pilot valve 63. As shown in FIG. 4, when all the operation levers 62 are set to the neutral positions, the pilot pump 65 Returns to the tank 66 from the neutral flow path of the control valve 64, and turns on the AI pressure switch 57. As shown in FIG. 5, when any one of the operation levers 62 is operated from the neutral position, the oil from the pilot pump 65 is shut off by the control valve 64 by operating one of the control valves 64, The AI pressure switch 57 is turned off by the pilot primary pressure.
[0018]
When the AI pressure switch 57 is turned on, the AI control unit 51 drives the AI motor 54 four seconds later to reduce the rotational speed of the engine 12 to the idling rotational speed. When the AI pressure switch 57 is turned off, the AI control unit 51 drives the AI motor 54 instantaneously to increase the rotation speed of the engine 12 to the rotation speed corresponding to the accelerator position of the accelerator lever 61. Have been. Further, the AI control unit 51 continues the normal idling control operation when the normal signal S1 is input from the immobilizer control unit 43, and drives the AI motor 54 when the irregular signal S2 is input from the immobilizer control unit 43. Thus, the rotation of the engine 12 is forcibly reduced to the idling rotation.
[0019]
FIG. 6 shows a configuration of an interference avoidance system provided in the backhoe (work equipment) 1. As shown in FIG. 7, the interference avoidance system includes an interference avoidance control unit 71 configured by a microcomputer or the like. The interference avoidance control unit 71 includes a boom sensor 72 that detects a swing angle (elevation angle) of the boom 19, an arm sensor 73 that detects a swing angle (flexion / extension angle) of the arm 22 with respect to the tip of the boom 19, and a trunk of the tip boom 19 </ b> C. Each detection signal from the offset sensor 74 for detecting the swing angle (offset angle) with respect to the boom 19A is input, and the verification signal S (regular signal S1, irregular signal S2) from the anti-theft mechanism 44 is input.
[0020]
Further, the interference avoidance control unit 71 calculates the position of the tip of the arm 22 from the detection signals from the boom sensor 72, the arm sensor 73, and the offset sensor 74. At the same time as the bucket 25 approaches the avoidance zone, the arm 22 is activated to extend (dump), and even if the raising operation and the offset operation of the boom 19 are simultaneously performed, the backhoe device ( (Working device) The proportional solenoid valve 77 for raising the boom, the proportional solenoid valve 78 for scraping (bending) the arm, the proportional solenoid valve 79 for offset left, and the arm dump (extension) so that the 6 can move smoothly without stopping. Is controlled.
[0021]
That is, the interference avoidance control unit 71 detects (calculates) the position of the tip of the arm 22 based on the detection signals from (1) the boom sensor 72, the arm sensor 73, and the offset sensor 74. {Circle around (2)} When the position of the tip of the arm 22 approaches the interference avoidance area, the current flowing to the arm scraping proportional solenoid valve 78 is automatically limited. (3) Immediately before reaching the interference avoidance area, a current is supplied to the arm dump proportional solenoid valve 80, and the arm 22 is dumped (extended).
Also, the interference avoidance control unit 71 continues the normal interference avoidance control operation when the normal signal S1 is input from the immobilizer control unit 43, and when the irregular signal S2 is input from the immobilizer control unit 43, The current to the proportional solenoid valve 77 and the arm dump proportional solenoid valve 78 is stopped. Thus, when the backhoe 1 is stopped, the normal posture of the backhoe device 6 is set, that is, the boom 19 is lowered and the arm 22 is extended, and the bucket 25 is held in the stopped position in which the bucket 25 is in contact with the ground at the front position. The normal operation of the backhoe (working machine) 1 is disabled.
[0022]
The proportional solenoid valve 77 for raising the boom operates to extend the boom cylinder 18 so as to raise the boom 19 at a speed substantially proportional to the magnitude of the current supplied to the boom cylinder. Proportional solenoid valve 78 reduces the arm cylinder 21 to bend the arm 22 at a speed substantially proportional to the magnitude of the current supplied thereto, and the offset left proportional solenoid valve 79 The offset cylinder 30 is extended and retracted so as to offset the tip boom 19C and the like at a speed proportional to the magnitude of the current to be supplied, and the proportional solenoid valve 80 for arm dump (extension) controls the magnitude of the current supplied thereto. The arm cylinder 18 is extended so as to extend the arm 22 at a speed substantially proportional to the speed.
[0023]
According to the above-described embodiment, for example, even if the accelerator lever 61 is at the maximum (MAX), when all the operating levers 62 are returned from the operating state to the neutral position, the oil from the pilot pump 65 is supplied to the control valve. Returning to the tank 66 from the neutral flow path 64 reduces the pressure on the AI pressure switch 57, thereby turning on the AI pressure switch 57. Four seconds later, the AI motor 54 is driven, and the rotational speed of the engine 12 is reduced. To idle rotation.
Further, for example, when one of the operation levers 62 is operated from the neutral position to the working state while the accelerator lever 62 is being operated to the maximum (MAX), one of the control valves 64 is operated, and the pilot pump 65 is operated. And the primary pressure of the pilot turns off the AI pressure switch 57. As a result, the AI control unit 51 operates the AI motor 54 until the governor lever 53 reaches the maximum (MAX) position, so that the rotation speed of the engine 12 instantaneously increases to the maximum rotation speed.
[0024]
Therefore, when the work by the work implement 1 is interrupted and all the operation levers 62 are set to neutral, the rotation of the engine 12 automatically becomes idle after 4 seconds, which contributes to energy saving and low noise.
When starting the engine 12, the immobilizer control mechanism 43 operates as shown in the flowchart of FIG. 7, the auto idle system performs the control operation as shown in the flowchart of FIG. 8, and the interference avoidance system performs the control operation as shown in the flowchart of FIG. Control operation as follows.
[0025]
That is, when the regular engine key 36 is inserted into the main switch 35 and turned from the off position (OFF) to the start position (START) (step 1), the transmission signal of the ID code of the regular engine key 36 is transmitted. The antenna 41 receives the signal (step 2), and the immobilizer control section 43 collates the ID code stored in advance with the ID code of the engine key 36 (step 3). When the collation is established (step 4). Since the starter switch 46 is turned on and the start of the engine 12 is permitted, when the main switch 35 is set to the start position, the starter 34 is connected to the battery 33 via the main switch 35 and the starter 34 operates. Then, the engine 12 is started (step 5). Further, the regular signal S1 is output from the anti-theft mechanism 44 (immobilizer control unit 43) to the AI control unit 51 and the interference avoidance control unit 71, and the AI control unit 51 and the interference avoidance control unit 71 perform a normal control operation ( Steps 16 and 26).
[0026]
However, when the unauthorized engine key 36 is inserted into the main switch 35 and rotated from the off position (OFF) to the start position (START) (step 1), the ID code of the unauthorized engine key 36 is transmitted. The signal is received by the antenna 41 (step 2), and the immobilizer control unit 43 checks the ID code of the engine key 36 (step 3). If the check is not established (step 6), the starter switch 46 is turned off. When the main switch 35 is set to the start position, the starter 34 is not connected to the battery 33 via the main switch 35, and the starter 34 does not operate. Does not start (step 7).
[0027]
At this time, the immobilizer control unit 43 outputs the irregular signal S2 to the AI control unit 51 (step 7), whereby the AI control unit 51 drives the AI motor 54 to move the governor lever 53 to the idling position. Set (step 14). Further, the immobilizer control unit 43 outputs the irregular signal S2 to the interference avoidance control unit 71 (step 7), thereby stopping the current to the boom raising proportional solenoid valve 77 and the arm dumping proportional solenoid valve 78. (Step 24).
As a result, by using the unauthorized engine key 36, the start of the engine 12 is not permitted, and at the same time, even if the engine 12 is started, the engine 12 is maintained at the idling rotation. The boom 19 and the arm 22 do not operate, thereby making the working machine 1 unable to travel normally, thereby reliably preventing the working machine 1 from being stolen.
[0028]
Therefore, even if the user finds out that the anti-theft mechanism 44 is incorporated and short-circuits the start position of the main switch 35 and the starter 34 with an electric wire or the like, for example, the anti-theft mechanism 44 does not operate. When the unauthorized engine key 36 is inserted into the main switch 35 and turned from the off position (OFF) to the start position (START) (step 1), the transmission signal of the ID code of the unauthorized engine key 36 is transmitted. The antenna 41 receives the signal (step 2), the immobilizer control unit 43 checks the ID code of the engine key 36, and if the check fails (step 6), the improper signal S2 from the immobilizer control unit 43 is subjected to AI control. The AI controller 51 drives the AI motor 54 to output the rotation of the engine 12 (step 7). The lower the idling speed (step 14). Further, the immobilizer control unit 43 outputs the irregular signal S2 to the interference avoidance control unit 71 (step 7), thereby stopping the current to the boom raising proportional solenoid valve 77 and the arm dumping proportional solenoid valve 78. (Step 24). As a result, for example, the boom 19 is lowered and the arm 22 is extended, and the bucket 25 is held in a stopped position in which the bucket 25 is in contact with the ground at the front position, so that the backhoe (working machine) 1 cannot normally travel.
[0029]
Therefore, even if the installation of the anti-theft mechanism 44 is not found, the use of the unauthorized engine key 36 causes the engine 12 to start, but the engine 12 starts idling and the boom 19 and the arm 22 of the working device 6 operate. As a result, the working machine 1 cannot perform normal traveling, and the working machine 1 can be reliably prevented from being stolen.
In the above embodiment, when the plurality of operation levers 62 are all set to the neutral position, the AI control system that holds the rotation of the engine 12 at the idling rotation receives the irregular signal S2 of the anti-theft mechanism 44. The irregular signal S2 of the anti-theft mechanism 44 is input to an interference avoidance system that has a function of inputting and holding the rotation of the engine 12 at idling rotation and controlling the working device 6 so as not to enter the interference area. A work machine control means is provided which has a function of stopping the operation of the work device 6 so that the normal running of the work machine 1 becomes impossible when an unauthorized engine key 36 is used. Instead of this, a plurality of operating levers 62 are used to control the working machine control means for disabling normal running of the working machine 1 when the unregulated engine key 36 is used. When set to, the AI control system which holds the rotation of the engine 12 at idling rotation is provided with a function of inputting the irregular signal S2 of the anti-theft mechanism 44 and holding the rotation of the engine 12 at idling rotation. You may comprise.
[0030]
That is, in the above-described embodiment, the immobilizer controller 43 compares the collation signal S (the regular signal S1 and the irregular signal S2) with the AI controller 51 and the interference avoidance controller 71 when collating the ID code of the engine key 36. When the unauthorized engine key is used, the AI control unit 51 forcibly reduces the rotation of the engine 12 to idling rotation, and the interference avoidance control unit 71 causes the proportional solenoid valve for raising the boom to be output. The current to the 77 and the arm dump proportional solenoid valve 78 is stopped, but instead, the immobilizer control unit 43 checks the ID signal of the engine key 36 when the ID signal of the engine key 36 is checked. The signal S1 and the irregular signal S2) are output only to the AI control unit 51 without being output to the interference avoidance control unit 71, and when the irregular engine key 36 is used. The AI controller 51 may be a rotation of the engine 12 to lower forcibly the idling. In this case, the use of the unauthorized engine key 36 disables the start of the engine 12 and at the same time, even if the engine 12 is started, the engine 12 is held at the idling rotation. The normal running becomes impossible, and the theft of the work machine 1 can be reliably prevented.
[0031]
Further, in the above-described embodiment, when the plurality of operation levers 62 are all set to the neutral position, the AI control system that holds the rotation of the engine 12 at the idling rotation receives the irregular signal S2 of the anti-theft mechanism 44. A work machine control means is provided which has a function of inputting and holding the rotation of the engine 12 at idling rotation so that the normal running of the work machine 1 becomes impossible when an irregular engine key 36 is used. However, instead of this, the AI control system is provided with a function of inputting the irregular signal S2 of the anti-theft mechanism 44 to maintain the rotation of the engine 12 at high speed, and the irregular engine key 36 is used. Work implement control means may be configured to disable the normal traveling of the work implement 1 when the work is performed.
[0032]
Further, in the above-described embodiment, when the engine 12 is started using the improper engine key 36 by the immobilizer system by the anti-theft mechanism 44, the engine 12 cannot be started. When the engine 12 is started using an unauthorized engine key 36 by a ten-key system using a security code or the like instead of the immobilizer system, the engine 12 is stolen so that the engine 12 cannot be started. The prevention mechanism 44 may be configured.
[0033]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, even if the incorporation of a theft prevention mechanism is found, it is possible to reliably prevent theft.
[Brief description of the drawings]
FIG. 1 is an overall side view of a turning work machine according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of the electric control system.
FIG. 3 is a configuration diagram of the electric control system.
FIG. 4 is a configuration diagram of the AI control system before the vehicle enters an idling rotation state.
FIG. 5 is a configuration diagram of the AI control system in an idling rotation state.
FIG. 6 is a configuration diagram of the interference avoidance system.
FIG. 7 is a flowchart showing the operation of the anti-theft mechanism.
FIG. 8 is a flowchart showing an operation in the automatic idle system.
FIG. 9 is a flowchart showing an operation in the interference avoidance system.
[Explanation of symbols]
1 backhoe (work equipment)
6. Backhoe device (working device)
12 Engine
33 Battery (power supply)
36 engine key
43 Immobilizer control unit
46 Starter switch
62 Operation lever

Claims (4)

An engine (12) serving as a power source for running the work machine (1) is provided, and when the engine (12) is started with a regular engine key (36), the engine (12) is allowed to start, and When a starting operation of the engine (12) is performed using a regular engine key (36), the anti-theft device for a working machine including an anti-theft mechanism (44) for disabling the starting of the engine (12) includes:
The anti-theft mechanism (44) is configured to detect when an unauthorized engine key (36) is used and to output an unauthorized signal S2. An anti-theft device for a working machine, comprising a working machine control means for inputting a signal S2 to disable the normal running of the working machine (1). The anti-theft mechanism (44) verifies the ID code of the engine key (36), and when the verification is successful, turns on a starter switch (46) interposed between the power supply (33) and the starter (34). Then, the start of the engine (12) is permitted, and if the collation is not established, the starter switch (46) is kept off, and the immobilizer control unit (43) for disabling the start of the engine (12) is activated. The anti-theft device for a working machine according to claim 1, wherein the anti-theft device is provided. When the plurality of operation levers (62) are all set to the neutral position, the irregular signal S2 of the anti-theft mechanism (44) is input to the AI control system that holds the rotation of the engine (12) at idling rotation. The anti-theft device for a work machine according to claim 1, wherein the work machine control means is configured to have a function of holding the rotation of the engine (12) at idling rotation by a motor. When the plurality of operation levers (62) are all set to the neutral position, the irregular signal S2 of the anti-theft mechanism (44) is input to the AI control system that holds the rotation of the engine (12) at idling rotation. The work implement control device according to claim 1, wherein the work implement control means is configured to have a function of maintaining the rotation of the engine (12) at a high speed.

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