JP2005069113A - Engine control device for working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically stop an engine in accordance with an attitude of a seat even in a working machine such as TLB changeable between a front-directed attitude and a back-directed attitude. <P>SOLUTION: An engine control device for a working machine whose seat 4 is changeable between a front-directed attitude and a back-directed attitude is provided with a seating sensor 82 for detecting seating on the seat 4, a seat attitude detecting means 83 for detecting that the seat 4 is in a front-directed attitude, and an engine stop means for stopping an engine 61 by connecting a PTO clutch 66 without operating a traveling system when the seating sensor 82 does not detect seating and the seat attitude detecting means 83 detects the seat 4 in the front-directed attitude. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an engine control device for a work machine such as a tractor, loader, backhoe (TLB) or the like.

For example, in an engine control device for a work machine other than a tractor, loader, backhoe (TLB), a seating sensor is provided on the seat, and for example, when the traveling system is operated without stepping on the seat (depressing an accelerator pedal or the like), the engine Is automatically stopped, or the engine is automatically stopped when the PTO clutch is connected with the seat set in a forward-facing posture (for example, Patent Document 1, Patent Document 2, Patent Document). 3).
JP 2002-59873 A Japanese Patent Laid-Open No. 10-283518 Japanese Patent Laid-Open No. 01-101235

  However, work machines such as tractors, loaders, and backhoes (TLBs) are configured such that the seat can be changed to a rearward posture in which the seat is rearward in addition to a forward posture in which the seat (driver's seat) is forward. Therefore, even if the engine control device of the conventional work machine is applied, the engine does not automatically stop even if inconvenience occurs when the seat is set in the backward posture. If the traveling system is mistakenly operated in the (backhoe) posture, the tractor may start to advance while the seat remains in the backward (backhoe) posture. Further, when the seat is changed to the backward posture after running on the tractor and the backward operation is performed, the engine is stopped and the backward operation cannot be smoothly performed.

  In view of the above problems, the present invention enables an engine to be automatically stopped according to the posture of a seat even in a working machine such as a TLB in which the seat can be changed between a forward posture and a rearward posture.

The technical means of the present invention for solving this technical problem is an engine control device for a working machine in which the seat 4 can be changed in posture between a forward posture and a rearward posture.
A seating sensor 82 for detecting that the seat 4 is seated is provided, and a seat posture detecting means 83 for detecting that the seat 4 is in a forward-facing posture is provided.
If the seat posture detection means 83 detects that the seat 4 is in the forward posture when the seating sensor 82 has not detected the seating, the engine is operated when the PTO clutch 66 is connected without operating the traveling system. The engine stop means for stopping 61 is provided.

In addition, another technical means of the present invention is an engine control device for a working machine in which the seat 4 can be changed in posture between a forward posture and a rearward posture.
A seating sensor 82 for detecting that the seat 4 is seated is provided, and a seat posture detecting means 83 for detecting that the seat 4 is moved from the forward posture to the backward posture side by a predetermined amount or more is provided.
If the seat posture detection means 83 does not detect that the seat 4 is moved from the forward posture to the rearward posture side when the seating sensor 82 has not detected the seating, the PTO is not operated without operating the traveling system. When the clutch 66 is connected, an engine stop means for stopping the engine 61 is provided.

In addition, another technical means of the present invention is an engine control device for a working machine in which the seat 4 can be changed in posture between a forward posture and a rearward posture.
Sheet posture detecting means 83 for detecting that the seat 4 has been moved from the forward posture to the backward posture side by a predetermined amount or more is provided,
An engine stop unit is provided for stopping the engine 61 when the traveling system is operated while the seat posture detection unit 83 detects that the seat 4 has been moved from the forward posture to the backward posture side by a predetermined amount or more. There is in point.

In addition, another technical means of the present invention is an engine control device for a working machine in which the seat 4 can be changed in posture between a forward posture and a rearward posture.
Sheet posture detecting means 83 for detecting that the seat 4 is in the forward posture is provided,
When the traveling system is operated when the seat posture detection unit 83 does not detect that the seat 4 is in the forward-facing posture, an engine stop unit that stops the engine 61 is provided.
According to another technical means of the present invention, the engine stop means is configured such that when the traveling system is operated when the seating sensor 82 for detecting the seating on the seat 4 does not detect the seating, The engine 61 is configured to stop regardless of the detection state of the detection means 83.

  According to the present invention, even with a working machine such as a TLB in which the seat can be changed between a forward posture and a rearward posture, the engine can be automatically stopped according to the posture of the seat.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 2 shows the entire tractor / loader / backhoe (TLB) in which the front loader 2 and the backhoe 3 are mounted on the tractor body 1, and the driver's seat 4 is used when the tractor travels on the road and works with the front loader. The posture can be changed between a forward posture A and a backward posture B used during the backhoe work.
A transmission case 5 forms a rear portion of the vehicle body 1. A rear axle case 6 is attached to the rear side of the transmission case, and a hydraulic device 7 for raising and lowering the work machine used when the backhoe is not used is mounted on the rear side. ing.

3 to 10, the seat 4 is mounted on a floor sheet 8 that covers the hydraulic device 7 via a sheet reversing support device 13 having parallel links 11. Reference numeral 14 denotes a fixed base. The parallel links 11 have a pair of front and rear, and one ends thereof are pivotally connected via front and rear horizontal shafts 22F and 22R. The rear support link 15R and the fixed base 14 are urged in the standing direction by a tension spring (biasing means) 16 provided therebetween.
The front and rear parallel links 11F and 11R are each formed of two left and right, and the rear parallel link 11R has an arm 25 protruding downward, and the above-described front shaft 22F is fixed between the fixed shaft 25a fixed to the arm 25 and the front horizontal shaft 22F. A tension spring 16 is stretched.

Reference numeral 18 denotes a swivel base, in which a circular opening 19 is formed in the center, and a slide guide 15a which is fixed to the upper surface of the support base 15 and is lower than the thickness of the swivel base 18 is fitted in the opening 19. A swivel base 18 is mounted on the support base 15 so as to be rotatable about a vertical axis.
A pair of left and right guide rails 20 are fixed on the swivel base 18, and a sliding plate 21 is provided on the left and right guide rails 20 so as to be freely slidable in the front and rear directions. The front portion of the seat 4 is pivotally connected, and a cushion 23 for receiving the rear portion of the seat 4 is provided at the rear portion of the sliding plate 21. The sheet 4 can rotate around the pivot 24 to expose the swivel base 18.

A lock means 27 is provided between the support base 15 and the swivel base 18 at a position rotated by 180 °, and a height restriction means 28 is provided between the support base 15 and the parallel link 11. .
The lock means 27 has an operation handle 29 supported by the swivel base 18, and the operation handle 29 is inserted into an insertion hole of an attachment member 30 fixed to the swivel base 18 and is slidable in the horizontal direction. Has been. A block-shaped lock member 31 is fixed to one end of the operation handle 29 by a knock pin. The operation handle 29 between the attachment member 30 and the lock member 31 biases the lock member to the opposite side with respect to the attachment member 30. A spring 26 is fitted.

  Further, an engaging disk 38 is fastened to the bolt 36 fixed to the supporting table 15 with a nut 39 via a spacer 37 at the upper part of the slide guide 15a of the supporting table 15, and the outer diameter of the engaging disk 38 is set to the slide guide 15a. The outer diameter is larger than the outer diameter and prevents the swivel base 18 placed on the support base 15 from coming off upward, and the engaging disk outer edge 38a is in contact with the sliding portion of the lock member 31 during swiveling. It has become. Further, at the position where the engagement disk outer edge 38 a is displaced by 180 °, two engagement portions 40, 40 that engage with the lock member 31 are provided, and the lock member 31 engages with the engagement portion 40. Thus, the rotation of the swivel base 18 is restricted. Note that guide plates 41 and 41 are fixed to the left and right of the lock member 31 to restrict the positional deviation in the left-right direction.

Accordingly, when the operation handle 29 is pulled forward against the spring 26, the lock member 31 is detached from the engagement portion 40, and when the swivel base 18 is rotated a little and returned to the original operation handle, the lock member 31 is engaged with the engagement disk. When the swivel base 18 abuts on the outer edge 38a and is further rotated in this state, the lock member 31 engages with the engaging part 40 and the swivel base 18 is fixed forward or rearward.
The height restricting means 28 includes a projecting engagement portion 32 provided at the upper end of the rear parallel link 11R, and a regulating member 33 that is detachably engaged with the projecting engagement portion 32. The projecting engagement portion 32 is provided to protrude outward in the axial direction on a cylindrical block 11A fixed to the upper end of the rear parallel link 11R.

  The restricting member 33 is formed by two boss members 33B and 33C fixed to the boss 33A fitted to the rear support shaft 17R, and the upper plate member 33B has an upper surface 33a sliding on the lower surface of the support base 15. It is in contact freely and moves linearly in the axial direction without rotating, and the lower surface b engages with the projecting engagement portion 32 by this linear movement. The lower surface 33b engages with the projecting engagement portion 32, thereby restricting upward rotation beyond a certain level so that the parallel link 11 becomes vertical. The height limiting means 28 functions both when the sheet 4 is facing forward and when it is facing backward, and prevents the sheet 4 from being lifted. A horizontal rod 43 that protrudes forward is fixed to the lower surface of the lower flat plate member 33C, and the rear support shaft 17R between the other rear parallel link 11R and the regulating member 33 that does not have a projecting engagement portion is pushed. A spring 35 is fitted to urge the restricting member 33 toward the protruding engagement portion. Reference numeral 42 denotes a color.

Interlocking means 34 is provided between the locking means 27 and the height limiting means 28. The interlocking means 34 has a stepped piece 44 fixed to the lock member 31, a center pin 45 slidably movable in the vertical direction by the stepped piece 44, and the regulating member 33 protruding from the center pin 45. And an interlocking portion 46 that engages and disengages from the engaging portion 32.
The center pin 45 is fitted in a support cylinder 47 fixed in a penetrating manner in the center of the support base 15 so as to be slidable in the vertical direction, and the upper part is in contact with the stepped piece 44. Note that the support cylinder 47 protrudes upward through a through hole 38 a provided in the center of the engagement disk 38.

The stepped piece 44 has a stepped portion 48 formed at the center by bending at two places, the lock member 31 is fixed to one end on the upper side, and a slit 49 is provided on the other end on the lower side. It has been. A support boss 50 is planted on the swivel base 18 at a position corresponding to the slit 49, and the lower side of the stepped piece 44 is placed on the swivel base 18. The part 50a is provided and the slit 49 is fitted. And the bolt 51 via the flat washer 52 is fixed to the small diameter portion 50a to restrict the upward movement of the stepped piece and to be horizontally movable.
The interlocking portion 46 has two support plates 54 attached to the support base 15, and an operation rod 55 is supported on the support plate 54 so as to be rotatable in the horizontal direction. A horizontal plate 56 is fixed to one end of the operation rod 55, and a vertical rod 57 is fixed to the other end. The horizontal plate 56 is in contact with the lower end of the center pin 45, and the vertical rod 57 is in contact with the horizontal rod 43 of the regulating member 33.

  As a result, when the stepped piece 44 is moved in the forward direction (in the direction of arrow A in FIG. 3), the center pin 45 moves downward, and the horizontal plate 56 rotates around the axis of the operating rod 55 to move the vertical rod 57. Also rotates around the axis of the operating rod 55. By the rotation of the vertical rod 57, the horizontal rod 43 of the restricting member 33 is pushed to the rear parallel link 11R side that does not have the protruding engagement portion 32, and the engagement between the upper flat plate material 33B and the protruding engagement portion 32 is released. Is done. Further, when the stepped piece 44 is moved backward (in the direction of arrow B in FIG. 3), the center pin 45 is moved upward by the urging force of the spring 35 that urges the restricting member 33 toward the protruding engagement portion 32. The upper flat plate member 33 </ b> B engages with the projecting engagement portion 32 while moving.

In the state of the forward posture A indicated by the solid line in FIGS. 4 and 7, the restricting member 33 is engaged with the engaging portion 32, and the front and rear parallel links 11 </ b> F and 11 </ b> R are urged in the rising direction by the tension spring 16. Is limiting. When the operation handle 29 is pulled forward from this state, the lock member 31 is detached from the engaging portion 40, the lock of the swivel base 18 with respect to the support base 15 is released, and the seat 4 can be swung around the vertical axis. At the same time, the regulating member 33 is detached from the projecting engagement portion 32, and the front and rear parallel links 11F and 11R can rise.
Then, after the parallel links 11F and 11R are tilted rearward, the seat 4 is rotated by 180 ° and the lock member 31 is engaged with the engaging portion 40. Then, in FIG. 4 and FIG. As shown, the upward swing of the parallel link 11 in the backward posture B is restricted.

When the parallel link 11 is tilted from the front side to the rear side, the arm 25 passes on the center line of the front and rear horizontal shafts 22F and 22R, and then the tension spring 16 is in a neutral state.
Reference numeral 60 denotes a damper member that supports the seat 4 in the forward posture A and the backward posture B. The damper rubber 61 is attached to an attachment plate 59 that is fastened to the upper end portions of the pair of front parallel links 11F. And a pressing spring 62 fixed to the outside of the pressing spring 62. A spring cap 63 is covered on the pressing spring 62. The damper member 60 contacts the front mounting member 14a of the fixed base 14 in the forward posture A, and contacts the back surface of the support base 15 in the rearward posture B to prevent the seat 4 from bottoming.

Further, a stopper 64 that supports the seat 4 in the rearward posture B is provided on the rear upper portion of the fixed base 14, and the rear parallel link 11 </ b> R contacts the stopper 64. Furthermore, when it is desired to change the height and position of the seat 4, it can be dealt with by changing the mounting position of the stopper 64 or changing the length of the parallel link 11.
In addition, this invention is not limited to the said Example, A various deformation | transformation can be carried out. For example, the height of the slide guide 15a can be made higher than the thickness of the swivel base 18, and only the portion corresponding to the engaging portion 40 of the engaging disc 38 can be lowered to engage the lock member 31 as the engaging portion. .

As shown in FIG. 2, an HST (hydrostatic continuously variable transmission) 63 to which the power of the engine 61 is input via a main clutch 62 in the clutch housing is provided in the mission case 5. Further, a traveling subtransmission mechanism 65 and a PTO clutch 66 are provided in the mission case 5. The speed change power of the motor of the HST 63 is input to the sub-transmission mechanism 65, and the power of the motor not changed by the HST 63 is input to the PTO shaft 67 via the PTO clutch 66.
The main clutch 62 is configured to be disconnected when a clutch pedal (not shown) is depressed and to be connected when the clutch pedal is released. The subtransmission mechanism 65 is configured to be switchable between high speed, neutral, and low speed by operating a subtransmission operation lever (not shown), and the power of the subtransmission mechanism 65 is transmitted to the rear wheels via the differential mechanism. Yes. The PTO clutch 66 is connected and disconnected by a PTO clutch operating lever (not shown). The PTO clutch 66 is normally disconnected, the backhoe 3 is removed from the tractor body 1 and a car wash pump or other work tool is mounted, and power is transmitted from the PTO shaft 67 to the work tool to drive the work tool. In this case, the PTO clutch 66 is connected by the PTO clutch operation lever so that the power is taken out from the PTO shaft 67.

As shown in FIG. 11, an HST pedal 71 that controls the operation of the HST 63 is provided on a step floor or the like on the mission case 5. The HST pedal 71 is supported so as to be able to swing back and forth around the horizontal axis 72. If the HST pedal 71 is stepped forward, the forward traveling state of the tractor body 1 is obtained, and if the HST pedal 8 is stepped backward, the tractor body 1 reverse traveling state is obtained, and when the depression is released, the HST pedal 71 returns to the neutral position and the traveling of the tractor vehicle body 1 is stopped.
FIG. 1 shows the configuration of a control system that controls the engine 13 and the like. In FIG. 1, 73 is a battery (power source), 74 is a starter, 75 is a key switch (main switch), and a key is inserted and turned from an off position (OFF) to an on position (ON) and a start position (START). When the key is inserted and the key switch 75 is set to the start position and the hand is released from the key, the key switch 75 is returned to the on position by the force of the spring. When 75 is between the on position and the start position, the contact R and contact RW of the key switch 75 are connected, and power is supplied from the battery 73 to an engine control unit 81 and an engine stop solenoid 92 which will be described later. When 75 is set at the start position, contact R, contact RW and contact BW of key switch 75 are connected. , The start signal S1 to the input terminal F of the engine control unit 81 from the key switch 75 are outputted.

A starter relay circuit 77 is provided between the battery 73 and the starter 74. The starter relay circuit 77 has a relay switch 77a and a relay coil 77b. The relay switch 77a is interposed between the battery 73 and the starter 74. When a current flows through the relay coil 77b, the relay switch 77a is turned on, and the starter 74 is connected to the battery 73 via the relay switch 77a. 61 is configured to start.
Reference numeral 81 denotes an engine control unit constituted by a CPU or the like, and has input terminals A, B, C, F, and G, and output terminals D and E. As shown in FIG. 4, a seating sensor 82 is constituted by a pressure sensor or the like and is built in the seat 4 and is turned on when the operator is seated on the seat 4 and turned off when the worker leaves the seat 4. It is configured as follows.

  Reference numeral 83 denotes a sheet posture detecting means, which is composed of, for example, a rotation detection switch for detecting the rotation of the sheet 4. The seat posture detection means 83 has a contact point a and a contact point b. When the seat 4 is in the forward posture, the contact point b is turned on and the lock of the seat 4 by the lock member 31 is released. When the seat 4 is slightly rotated (moved more than a predetermined amount) from the forward posture to the backward posture side, this is detected and the contact a is turned on. The contact a is turned on when the seat 4 is rotated to the backward posture. Even if locked by the lock member 31, it is held. Therefore, the seat posture detection means 83 is turned off (contacts a and b) only during a short period from when the seat 4 is locked in the forward posture to when the lock 4 is released and the seat 4 is slightly rotated to the backward posture. Are both off), and the seat posture detection means 83 detects that the seat 4 is in the forward posture and detects that the seat 4 has been moved from the forward posture to the backward posture side by a predetermined amount or more.

  Reference numeral 84 denotes an HST pedal switch which is turned on when the HST pedal 71 is released and the HST pedal 71 returns to the neutral position. The HST pedal 71 is depressed forward (forward) or backward (reverse). It is configured to turn off when depressed. A PTO switch 85 is turned on when the PTO clutch 66 is disconnected and is turned off when the PTO clutch 66 is connected by a PTO clutch operating lever (not shown). A diode 86 is connected between the input terminal A and the input terminal B so that a signal input to the input terminal B of the engine control unit 81 is also input to the input terminal A.

88 is a clutch switch which is turned on when the main clutch 62 is disconnected by depressing the clutch pedal, and turned off when the main pedal 62 is connected after releasing the depression of the clutch pedal. Reference numeral 89 denotes an auxiliary transmission switch which is turned on when the auxiliary transmission mechanism 65 is set to neutral by operation of the auxiliary transmission operation lever, and is turned off when the auxiliary transmission mechanism 65 is switched to high speed or low speed. ing.
An engine stop solenoid 92 has a holding coil 92a and a suction coil 92b, and is connected to the battery 73 via the relay switch 93a of the stop relay circuit 93. Electric power is supplied from the battery 73 via the relay switch 93a. It is like that. Therefore, when the key switch 75 is in the starter position from the on position, if the relay coil 93b of the stop relay circuit 93 is energized and the relay switch 93a is on, a current is supplied from the battery 73 to the engine stop solenoid 92. When the fuel injection pump is supplied and the engine is in an operating state, the relay coil 93b of the stop relay circuit 93 is demagnetized and the relace switch 93a is turned off, the power supply from the battery 73 to the engine stop solenoid 92 is stopped, and the fuel injection pump Is configured to stop the engine.

  When the start signal S1 is input from the key switch 75 to the input terminal F (when the key switch 75 is set to the start position), the engine control unit 81 turns on either the clutch switch 88 or the auxiliary transmission switch 89. If a signal is input to any of the input terminals A, B, and C, an excitation current (signal) is output from the output terminal E to the relay coil 77b of the starter relay circuit 77, and the relay of the starter relay circuit 77 is output. The coil 77b is excited and the relay switch 77a is turned on, whereby the starter 74 is operated and the engine 61 is started.

  Therefore, the conditions for starting the engine 61 are as shown in Table 1. If the HST pedal switch 84 is on, the PTO switch 85 is on, and either the clutch switch 88 or the auxiliary transmission switch 89 is on, Regardless of the seating sensor 82 and the seat posture detection means 83, when the key switch 75 is set to the start position, the engine 61 starts.

  In addition, when the signal is input to the input terminal A (the terminal A is energized), the engine control unit 81 causes an excitation current to flow from the output terminal D to the relay coil 93 b of the stop relay circuit 93, thereby the stop relay circuit 93. The relay switch 93a is turned on to hold the fuel injection pump in the engine drive state. When the input of the signal to the input terminal A is stopped (the terminal A is de-energized), the output terminal D is slightly delayed (about 1 second) (because the engine controller 81 has a built-in timer for a fuel cut solenoid). The excitation current to the relay coil 93b of the stop relay circuit 93 is stopped from this, so that the relay switch 93a of the stop relay circuit 93 is turned off, the engine stop solenoid 92 is operated, and the fuel injection pump is stopped. It has become.

  Therefore, the conditions for the engine 61 to automatically stop are as shown in Table 2. If the seating sensor 82 is turned off and the HST pedal switch 84 is turned off, the seat posture detecting means 83 and the PTO switch 85 are used. The engine 61 is automatically stopped. Further, the seating sensor 82 is off, the HST pedal switch 84 is on, the seat posture detection means 83 is off (contacts a and b are both off), or the contact b of the seat posture detection means 83 is on, and the PTO switch 85 If is turned off, the engine 61 is automatically stopped. Further, if the HST pedal switch 84 is turned off and the seat posture detection means 83 is turned off or the contact a is turned on, the engine 61 is automatically stopped regardless of the seating sensor 82 and the PTO switch 85.

According to the embodiment, when the seat 4 is in the forward posture A, the arm 25 of the rear parallel link 11R protruding downward from the rear horizontal shaft 22R is locked to the front horizontal shaft 22F for the front parallel link 11F. The tension spring 16 is biased forward, and the parallel link 11 is biased upward to produce a suspension effect.
When the operation handle 29 is pulled forward, the lock means 27 is released and the height restriction means 28 is released at the same time. That is, the lock member 31 is detached from the engaging portion 40, and the swivel base 18 can be rotated about the longitudinal axis with respect to the support base 15, and the parallel link 11 is detached from the regulating member 33 by the interlocking means 34. Thus, the parallel link 11 can rise.

When the parallel link 11 is raised and the seat 4 is rotated 180 degrees to engage the lock member 31 with the engaging portion 40, the swivel base 18 is locked to the support base 15 so as not to rotate and the interlocking means 34. As a result, the restricting member 33 engages with the parallel link 11 and restricts the upward movement of the parallel link 11 to assume the backward posture B.
In order to start the engine 61, the depression of the HST pedal 84 is released, the HST pedal 84 is set to neutral, and the PTO clutch 66 is disconnected by operating the PTO clutch operation lever. 62 or the auxiliary transmission mechanism 65 is set to neutral, and then the key switch 95 is operated to the start position (START). At this time, the HST pedal switch 84 is turned on and the PTO switch 85 is turned on. Since either the clutch switch 88 or the auxiliary transmission switch 89 is turned on, a signal is input to any of the input terminals A, B, and C regardless of the seating sensor 82 and the seat posture detection means 83. The excitation current (signal) is output from the output terminal E to the relay coil 77b of the starter relay circuit 77, And exciting the relay coil 77b of Tatarire circuit 77 turns on the relay switch 77a, thereby, actuates the starter 74, the engine 61 is started.

  If the seating sensor 82 is turned off and the HST pedal switch 84 is turned off after the engine 61 is started, the signal input to the input terminal A of the engine control unit 81 is stopped. Thus, the exciting current to the relay coil 93b is stopped, whereby the relay switch 93a of the stop relay circuit 93 is turned off, the engine stop solenoid 92 is operated, and the fuel injection pump is stopped. Therefore, when the operator is away from the seat 4 and depresses the HST pedal 71 by mistake, regardless of the posture change state of the seat 4, the locked state of the seat 4 and the connected / disconnected state of the PTO clutch, It is possible to prevent the tractor vehicle body 1 from traveling in a state where the engine 61 is automatically stopped and the operator is not seated on the seat 4.

  Further, after the engine 61 is started, the seat sensor 82 is turned off and the HST pedal switch 84 is turned on, and the seat posture detecting means 83 is turned off (the contacts a and b are both turned off) or the contact of the seat posture detecting means 83. When b is turned on and the PTO switch 85 is turned off, the input of the signal to the input terminal A of the engine control unit 81 is stopped. Therefore, the exciting current from the output terminal D to the relay coil 93b of the stop relay circuit 93 is stopped. Thus, the relay switch 93a of the stop relay circuit 93 is turned off, the engine stop solenoid 92 is operated, and the fuel injection pump is stopped.

Therefore, when the PTO clutch 66 is connected without the operator sitting on the seat 4 and the HST pedal 71 is not depressed (the travel system is operated), the seat 4 is in a forward-facing posture or the seat If the engine 4 is not moved from the forward posture to the rearward posture side by a predetermined amount or more, the engine 61 automatically stops. Therefore, when the posture of the rearward work (stationary PTO work) is not established, power is supplied to the PTO shaft 67. The work tool mounted on the rear portion of the tractor vehicle body 1 is prevented from operating unexpectedly.
Moreover, even if the PTO clutch 66 is connected by operating the PTO clutch operation lever in a state where the seat 4 is locked in the forward posture after the engine 61 is started, if the operator is seated on the seat 4, the engine 61 Does not stop. Further, even if the operator leaves the seat 4 with the PTO clutch 66 connected, if the seat 4 is slightly rotated from the forward posture to the rearward posture side, the engine 4 does not have to stop, so the forward posture If the operator seated on the seat 4 connects the PTO clutch 66 after the engine 61 is started, releases the lock of the seat 4, and puts the seat 4 in a rearward posture, the engine 4 will not stop. The backward work (stationary PTO work) using the work tool mounted on the rear part of the tractor vehicle body 1 can be started smoothly.

  Further, when the HST pedal switch 84 is turned off after the engine 61 is started, if the contact a of the seat posture detecting means 83 is on or the seat posture detecting means 83 is off, the seating sensor 82 and the PTO switch are turned on. Regardless of 85, since the input of the signal to the input terminal A of the engine control unit 81 is stopped, the excitation current from the output terminal D to the relay coil 93b of the stop relay circuit 93 is stopped, thereby the stop relay circuit. 93, the relay switch 93a is turned off, the engine stop solenoid 92 is operated, and the fuel injection pump is stopped. Therefore, when the HST pedal 71 is depressed, if the lock by the lock member 31 in the forward posture of the seat 4 is released and the seat 4 is rotated from the forward posture to the rearward posture side, the operator is seated on the seat 4. Regardless of whether or not the PTO clutch 66 is engaged or disengaged, the engine 61 is automatically stopped, so that the tractor vehicle body is kept in a state where the seat 4 is not locked in the forward-facing posture. It is possible to prevent 1 from running.

Furthermore, according to the above-described embodiment, it is possible to form an engine control device in accordance with the characteristics of a working machine such as a TLB in which the seat 4 can be changed between a forward posture and a rearward posture. The circuit configuration of the engine control device can be made as simple as possible by minimizing the components of the engine control device such as relays and diodes.
In the embodiment described above, the engine stop means for automatically stopping the engine 61 under certain conditions according to the posture of the seat 4 is constituted by the engine control unit 81, the engine stop solenoid 92, the stop relay circuit 93, and the like. However, the engine stop means is not limited to such a configuration, and may be configured to be able to stop the engine 61 under certain conditions according to the posture of the seat 4.

  Further, in the above-described embodiment, when the HST pedal 71 is released and the HST pedal 71 is returned to the neutral position, it is turned on, and the HST pedal 71 is depressed forward (forward state) or backward (reverse state). The HST pedal switch 84 is provided so as to be turned off when it is depressed, and the traveling system (traveling) indicates that the HST pedal 71 is depressed forward (forward movement state) or backward (reverse movement state). The operation is detected by the HST pedal switch 84. Instead, for example, the tractor vehicle body 1 is provided with a main transmission mechanism instead of the HST 63, and is provided in a work machine provided with an accelerator pedal. For example, an accelerator pedal switch that detects depression of the accelerator pedal should be provided to check that the accelerator pedal has been depressed. As the traveling system is (travel) operation, it may be detected by an accelerator pedal switch.

  Further, the sheet reverse support device 13 that can change the posture of the sheet 4 between the forward posture and the backward posture is not limited to the structure of the above-described embodiment. For example, the sheet 4 is simply moved vertically without using a parallel link. It may be possible to change the posture between a forward posture and a rearward posture by rotation around the shaft, and to be able to lock the front and rear postures so as to be unlockable.

  In addition to engine control devices for work machines such as tractors, loaders, and backhoes (TLBs), the seat can be changed between a forward posture and a rearward posture, and can be used for engine control devices for other work machines such as tractors. it can.

It is a block diagram of the control system which shows one embodiment of this invention. It is a whole side view of TLB. It is a partial cross section perspective view of a sheet reversal support device portion. It is a side view of a sheet reversal support device portion. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG. It is the FF sectional view taken on the line of FIG. It is a side view of an HST pedal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tractor vehicle body 4 Seat 13 Seat inversion support device 61 Engine 66 PTO clutch 82 Seating sensor 83 Seat attitude | position detection means 92 Engine stop solenoid

Claims (5)

In the engine control device for a work machine in which the posture of the seat (4) is changeable between a forward posture and a rearward posture,
A seating sensor (82) for detecting the seating on the seat (4) is provided, and a seat posture detection means (83) for detecting that the seat (4) is in a forward posture;
If the seat posture detection means (83) detects that the seat (4) is in the forward posture when the seating sensor (82) has not detected the seating, the PTO clutch (66) is operated without operating the traveling system. ) Is connected, engine stop means for stopping the engine (61) is provided. In the engine control device for a work machine in which the posture of the seat (4) is changeable between a forward posture and a rearward posture,
A seating sensor (82) for detecting the seating on the seat (4) is provided, and a seat posture detecting means (83) for detecting that the seat (4) has been moved from the forward posture to the backward posture side by a predetermined amount or more. And
If the seat posture detection means (83) does not detect that the seat (4) has been moved from the forward posture to the backward posture side when the seating sensor (82) has not detected the seating, the traveling system is An engine control device for a working machine, comprising engine stop means for stopping the engine (61) when the PTO clutch (66) is connected without being operated. In the engine control device for a work machine in which the posture of the seat (4) is changeable between a forward posture and a rearward posture,
Sheet posture detecting means (83) for detecting that the seat (4) has been moved from the forward posture to the backward posture side by a predetermined amount or more is provided,
An engine that stops the engine (61) when the traveling system is operated while the seat posture detection means (83) detects that the seat (4) has been moved from the forward posture to the backward posture side by a predetermined amount or more. An engine control device for a working machine, wherein stop means is provided. In the engine control device for a work machine in which the posture of the seat (4) is changeable between a forward posture and a rearward posture,
Sheet posture detection means (83) for detecting that the sheet (4) is in a forward posture is provided,
Engine stop means is provided for stopping the engine (61) when the travel system is operated when the seat attitude detection means (83) does not detect that the seat (4) is in the forward attitude. An engine control device for a working machine.   When the traveling system is operated when the seating sensor (82) for detecting that the engine has been seated on the seat (4) has not detected the seating, the engine stop means detects the seat posture detection means (83). The engine control device for a working machine according to any one of claims 1 to 4, characterized in that the engine (61) is stopped regardless of whether or not.

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