JP2012092500A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle capable of preventing the malfunction of a hydraulic actuator and the misoperation of an operation lever device.SOLUTION: A work vehicle comprises: a group of direction switch valves 110 for switching the respective flow directions of hydraulic oil supplied to a plurality of hydraulic actuators; a group of pilot valves 120 for switching the respective flow directions of pilot hydraulic oil supplied to the group of the direction switch valves 110; a pilot switch valve 130 for switching selectively from a plurality of predetermined combinations a group of direction switch valve oil paths 110b to which the group of the direction switch valves 110 are respectively connected and a group of pilot oil paths 120a to which the group of the pilot valves 120 are respectively connected to respectively place them in communication; a potentiometer 133 for detecting the switching position P of the pilot switch valve 130; a liquid crystal display section 84c; and a controller 84e which controls the liquid display section 84c to display an operation pattern corresponding to the switching position P.

Description

  The present invention relates to a work vehicle, and more particularly to a technique for displaying a combination of hydraulic actuators driven for each operation of an operation lever device.

  2. Description of the Related Art Conventionally, work vehicles such as backhoes are configured to cause various work machines included in a work vehicle to perform desired operations and work by operating a plurality of hydraulic actuators with a plurality of operation lever devices. The hydraulic actuator driven for each operation of the operation lever device in such a work vehicle is uniquely set by each work vehicle manufacturer. Therefore, when a driver who has been operating a work vehicle of one work vehicle manufacturer controls a work vehicle of another work vehicle manufacturer, there is a possibility that the operation lever device may be erroneously operated. Therefore, there is known a work vehicle that can change the setting of a hydraulic actuator driven for each operation of the operation lever device (hereinafter simply referred to as “operation pattern”) to an operation pattern desired by the operator. . For example, it is like patent document 1.

  The work vehicle described in Patent Document 1 displays a current operation pattern on a display unit provided in a cockpit, and changes the control mode of each hydraulic actuator with respect to the electromagnetic valve via the display unit. The pattern can be set. Thus, the operator can easily change the operation pattern from the display unit, and prevents an erroneous operation of the operation lever device by checking the operation pattern displayed on the display unit during work.

JP 2001-214469 A

  Since the work vehicle described in Patent Literature 1 switches the operation pattern by changing the control mode, when noise, overcurrent, or the like is applied to the control unit, a control signal is transmitted to the hydraulic actuator in an operation mode different from the operation pattern. there is a possibility. That is, there is a possibility that the hydraulic actuator is driven with an operation pattern not intended by the operator. For this reason, there has been a problem that even if erroneous operation of the operation lever device can be prevented by displaying the operation pattern on the display unit, malfunction of the hydraulic actuator due to noise or overcurrent cannot be reliably prevented.

  An object of the present invention is to provide a work vehicle capable of preventing malfunction and erroneous operation of a hydraulic actuator.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to the first aspect of the present invention, a plurality of directional control valves that respectively switch the flow of hydraulic oil supplied to the plurality of hydraulic actuators, and the directional switching valves are provided for each of the directional switching valves. A plurality of pilot valves that respectively switch the flow of pilot hydraulic oil, a plurality of oil passages that are respectively connected to the plurality of directional switching valves, and a plurality of oil passages that are respectively connected to the plurality of pilot valves. A pilot switching valve that selectively switches from a plurality of predetermined combinations to communicate with each other, switching position detecting means for detecting a switching position of the pilot switching valve, a display unit disposed in the vicinity of the cockpit, and the switching position And a control unit that displays on the display unit under a predetermined condition.

  In Claim 2, The said control part has a memory | storage part, While storing the said switching position, the said switching position which the said switching position detection means newly detects is stored in the said memory | storage part. In the case where it is changed as compared with, a new switching position is displayed on the display unit in a predetermined display form.

  According to a third aspect of the present invention, there is further provided a pressure sensor for detecting a pressure when the operator is seated on the cockpit, and the control unit stores the pressure by the storage unit, and the pressure is predetermined. When the value becomes equal to or greater than the predetermined value again after the value becomes lower than the value, the switching position is displayed on the display unit in a predetermined display form.

  According to a fourth aspect of the present invention, the detection means includes a potentiometer.

  According to a fifth aspect of the present invention, the detection means includes a switch mechanism.

  As effects of the present invention, the following effects can be obtained.

  In claim 1, by changing the switching position of the pilot switching valve, the oil passage is configured to have a predetermined combination (hereinafter simply referred to as “combination”) of the plurality of directional switching valves and the plurality of pilot valves. Because of communication, the combination is not changed by disturbances such as noise and overcurrent. Even if the switching position of the pilot switching valve cannot be confirmed from the cockpit, the combination is displayed on the display device in the vicinity of the cockpit so that the operator can easily set the combination of the direction switching valve and the pilot valve. Can be confirmed. Therefore, it is possible to prevent malfunction and erroneous operation of the hydraulic actuator.

  In claim 2, the operator can easily recognize that the predetermined combination has been switched. Therefore, erroneous operation of the hydraulic actuator can be prevented.

  According to the third aspect of the present invention, the combination is displayed in a predetermined display form because it is determined that the driver has left the seat or the driver has changed due to a change in seat pressure, so that the combination is not mistaken. Therefore, erroneous operation of the hydraulic actuator can be prevented.

  In claim 4, since the detection range of the potentiometer can be arbitrarily set as each switching position of the pilot switching valve, the setting of the detection range of the potentiometer is changed even when the switching position of the pilot switching valve is different. Just do it. Therefore, the production cost can be reduced by sharing the parts.

  According to the fifth aspect of the present invention, it is possible to reduce erroneous detection due to disturbances such as noise and overcurrent, so that a predetermined combination can be accurately displayed. Therefore, erroneous operation of the hydraulic actuator can be prevented.

1 is a side view showing an overall configuration of a work vehicle according to a first embodiment of the present invention. The perspective view which shows the structure of the control part of the working vehicle which concerns on 1st embodiment of this invention. The front view which shows the structure of the display apparatus of the working vehicle which concerns on 1st embodiment of this invention. The figure which shows the whole structure of the hydraulic circuit which concerns on 1st embodiment of this invention. The side view which shows the pilot switching valve which concerns on 1st embodiment of this invention. The block diagram which shows the control structure which concerns on 1st embodiment of this invention. The block diagram which shows another embodiment of the control structure which concerns on 1st embodiment of this invention. The block diagram which shows the control structure which concerns on another embodiment of this invention. (A) The figure which shows a warning and an error screen among the screens displayed on the display apparatus which concerns on 1st embodiment of this invention. (B) The figure which shows the combination (operation pattern) screen among the screens displayed on the display apparatus which concerns on 1st embodiment of this invention. (A) The figure which shows a digging mode screen among the screens displayed on the display apparatus which concerns on 1st embodiment of this invention. (B) The figure which shows a menu screen among the screens displayed on the display apparatus which concerns on 1st embodiment of this invention. The flowchart figure which shows the control procedure of the control part of the display apparatus which concerns on 1st embodiment of this invention. The block diagram which shows the control structure which concerns on 2nd embodiment of this invention. The flowchart figure which shows the control procedure of the control part in case the seating sensor of the display apparatus which concerns on 2nd embodiment of this invention is a pressure sensor. The flowchart figure which shows the control procedure of the control part in case the seating sensor of the display apparatus which concerns on 2nd embodiment of this invention is a limit switch.

First, a backhoe 1 that is a work vehicle according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. In the present embodiment, the backhoe 1 is described as an embodiment of the work vehicle. However, the work vehicle is not limited to this, and may be other agricultural vehicles, construction vehicles, industrial vehicles, or the like.
In the following description, the direction of the arrow F is defined as the front direction of the backhoe 1, and the direction of the arrow L is defined as the left direction of the backhoe 1.

  The backhoe 1 mainly includes a traveling device 2, a turning device 3, and a work device 4.

The traveling device 2 mainly includes a pair of left and right crawlers 5, 5, a left traveling hydraulic motor 5L, and a right traveling hydraulic motor 5R.
The traveling device 2 can drive the backhoe 1 forward and backward by driving the left crawler 5 with the left traveling hydraulic motor 5L and the right crawler 5 with the right traveling hydraulic motor 5R. .

The swivel device 3 mainly includes a swivel base 6, a swivel motor 7, a control unit 8, and an engine 9.
The swivel base 6 is a main structure of the swivel device 3. The swivel base 6 is disposed above the traveling device 2 and is supported by the traveling device 2 so as to be able to turn. The turning device 3 can turn the turntable 6 with respect to the traveling device 2 by driving the turning motor 7. In addition, on the swivel base 6, a control unit 8 including various operation tools, an engine 9 serving as a power source, and the like are arranged.

The work device 4 mainly includes a boom 10, an arm 11, a bucket 12, a boom cylinder 13, an arm cylinder 14, and a bucket cylinder 15.
One end of the boom 10 is pivotally supported by the front portion of the swivel base 6 and is rotated by a boom cylinder 13 that is extended and retracted. More specifically, when the boom cylinder 13 is extended, the boom 10 is rotated upward, and when the boom cylinder 13 is contracted, the boom 10 is rotated downward.
One end of the arm 11 is pivotally supported by the other end of the boom 10 and is rotated by an arm cylinder 14 that is extended and retracted. More specifically, when the arm cylinder 14 is extended, the arm 11 is rotated downward (the direction in which the other end of the arm 11 is close to the boom 10), and when the arm cylinder 14 is contracted, the arm 11 is upward. (The other end side of the arm 11 is rotated away from the boom 10).
One end of the bucket 12 is supported by the other end of the arm 11 and is rotated by a bucket cylinder 15 that is driven to extend and retract. More specifically, when the bucket cylinder 15 is extended, the bucket 12 is rotated downward (a direction in which the other end side of the bucket 12 is close to the arm 11), and when the bucket cylinder 15 is contracted, the bucket 12 is upward. (The other end side of the bucket 12 is rotated away from the arm 11).
As described above, the working device 4 has a multi-joint structure that excavates earth and sand using the bucket 12. In addition, although the backhoe 1 which concerns on this embodiment is using the working apparatus 4 which has the bucket 12 and performs excavation work, it is not limited to this, For example, the working apparatus 4 which has a hydraulic breaker and performs crushing work It may be.

  As shown in FIG. 2, the control section 8 is provided with a control seat 81 in the approximate center, and a right operation lever device 82 and a left operation lever device 83 are arranged on both the left and right sides thereof. Each operation lever device is configured to be able to operate the turning motor 7, the boom cylinder 13, the arm cylinder 14, and the bucket cylinder 15. A display device 84 is provided on one side of the cockpit 81 (right side in the present embodiment). The display device 84 is disposed so that the display portion faces the pilot seated on the cockpit 81. The control unit 8 is provided with a throttle lever (not shown) that changes the throttle opening of the engine 9. The operator can change the output of the engine 9 by operating the throttle lever.

  As shown in FIGS. 2 and 3, the display device 84 includes a frame 84a, an LED display portion 84b, a liquid crystal display portion 84c, a liquid crystal operation portion 84d, and a control portion 84e (see FIG. 6).

  The frame body 84a is formed in a box shape having a substantially L shape in side view. The frame body 84 a is disposed on the right side of the cockpit 81 with the end facing upward so that the short side thereof faces the cockpit 81.

  The LED display part 84b is provided in the upper part of the short side part of the frame 84a. A plurality of graphics representing the operating state of the backhoe 1, the presence / absence of a warning, and the like are displayed on the LED display portion 84b, and LEDs are arranged in the respective graphics. In the LED display unit 84b, only a specific figure is lit when a corresponding LED is lit under a predetermined condition. Thus, the LED display part 84b is comprised so that information can be transmitted to a driver | operator. In the present embodiment, the LED display unit 84b displays the LED by turning it on. However, the present invention is not limited to this, and any light source capable of lighting control may be used.

  The liquid crystal display unit 84c, which is a display unit, is disposed on the short side of the frame 84a and on the lower side of the LED display unit 84b. The liquid crystal display unit 84c is composed of a liquid crystal screen that displays information. The liquid crystal display unit 84c can check the operating state of the backhoe 1 by switching the liquid crystal screen to a display corresponding to each work mode by operating a liquid crystal operation unit 84d described later. In this manner, the liquid crystal display unit 84c is configured to be able to transmit information to the operator. In the present embodiment, the liquid crystal display unit 84c is displayed on a liquid crystal screen, but is not limited to this, and may be anything that can arbitrarily display a plurality of information.

  The liquid crystal operation unit 84d is disposed at a short side portion of the frame 84a and at a lower portion of the liquid crystal display unit 84c. The liquid crystal operation unit 84d includes a plurality of operation buttons. The liquid crystal operation unit 84d is configured to be able to select a screen displayed on the liquid crystal display unit 84c by operating an operation button.

  The control unit 84e controls the LED display unit 84b and the liquid crystal display unit 84c. The control unit 84e is configured inside the frame body 84a adjacent to the LED display unit 84b and the liquid crystal display unit 84c, or integrally with the ECU 16 described later (see FIG. 6).

  Next, the hydraulic circuit 100 provided in the backhoe 1 will be described with reference to FIGS. 4 and 5.

  Hereinafter, for convenience of explanation, the direction switching valve 111 for the swing motor, the direction switching valve 112 for the boom cylinder, the direction switching valve 113 for the arm cylinder, and the direction switching valve 114 for the bucket cylinder are collectively referred to simply as “direction switching”. Valve group 110 ". The right front / rear pilot valve 121, the right / left left / right pilot valve 122, the left front / rear pilot valve 123, and the left left / right pilot valve 124 are collectively referred to simply as a “pilot valve group 120”.

  As shown in FIG. 4, the hydraulic circuit 100 mainly includes a direction switching valve group 110, a pilot valve group 120, a pilot switching valve 130, a pilot switching valve 130, and a hydraulic pump 140.

  The direction switching valve group 110 (the direction switching valve 111 for the turning motor, the direction switching valve 112 for the boom cylinder, the direction switching valve 113 for the arm cylinder, the direction switching valve 114 for the bucket cylinder) includes the turning motor 7, the boom cylinder 13, and the arm cylinder. 14 and the flow of hydraulic oil supplied to the bucket cylinder 15 are switched.

  The turning motor direction switching valve 111 is a pilot-type direction switching valve capable of switching the direction of hydraulic oil supplied to the turning motor 7 by sliding a spool with pilot pressure.

When a pilot pressure is applied to the turning motor direction switching valve 111, the turning motor direction switching valve 111 is switched from the neutral position to one or another position.
When the turning motor direction switching valve 111 is in one position, the hydraulic oil supplied to the turning motor direction switching valve 111 through the oil passage 111a is supplied to the turning motor 7 through the oil passage 7a. The turning motor 7 is rotationally driven in one direction by the hydraulic oil supplied through the oil passage 7a. The hydraulic oil discharged from the turning motor 7 is returned to the turning motor direction switching valve 111 through the oil passage 7b.
When the turning motor direction switching valve 111 is in another position, the hydraulic oil supplied to the turning motor direction switching valve 111 through the oil passage 111a is turned into the turning motor by the hydraulic oil supplied through the oil passage 7b. 7 is rotationally driven in the other direction. The hydraulic oil discharged from the turning motor 7 is returned to the turning motor direction switching valve 111 via the oil passage 7a.
The hydraulic fluid returned to the turning motor direction switching valve 111 via the oil passage 7 a or the oil passage 7 b is returned from the turning motor direction switching valve 111 to the hydraulic oil tank 150.

  The boom cylinder direction switching valve 112 is a pilot-type direction switching valve capable of switching the direction of hydraulic oil supplied to the boom cylinder 13 by sliding a spool with pilot pressure. The configuration of the boom cylinder direction switching valve 112 is substantially the same as the configuration of the swing motor direction switching valve 111.

  When the pilot pressure is applied to the boom cylinder direction switching valve 112, the boom cylinder direction switching valve 112 is switched from the neutral position to one or another position. The hydraulic oil supplied through the oil passage 112a is supplied to the boom cylinder 13 through the oil passage 13a or the oil passage 13b. The boom cylinder 13 is expanded and contracted by the hydraulic oil supplied via the oil passage 13a or the oil passage 13b, and the boom 10 is rotated upward or downward.

  The arm cylinder direction switching valve 113 is a pilot-type direction switching valve capable of switching the direction of hydraulic fluid supplied to the arm cylinder 14 by sliding a spool with pilot pressure. The configuration of the arm cylinder direction switching valve 113 is substantially the same as the configuration of the swing motor direction switching valve 111.

  When the pilot pressure is applied to the arm cylinder direction switching valve 113, the arm cylinder direction switching valve 113 is switched from the neutral position to one or another position. The hydraulic oil supplied through the oil passage 113a is supplied to the arm cylinder 14 through the oil passage 14a or the oil passage 14b. The arm cylinder 14 is expanded and contracted by the hydraulic oil supplied via the oil passage 14a or the oil passage 14b, and the arm 11 is rotated upward or downward.

  The bucket cylinder direction switching valve 114 is a pilot-type direction switching valve capable of switching the direction of hydraulic oil supplied to the bucket cylinder 15 by sliding a spool with pilot pressure. The configuration of the bucket cylinder direction switching valve 114 is substantially the same as the configuration of the swing motor direction switching valve 111.

  When the pilot pressure is applied to the bucket cylinder direction switching valve 114, the bucket cylinder direction switching valve 114 is switched from the neutral position to one or another position. The hydraulic oil supplied through the oil passage 114a is supplied to the bucket cylinder 15 through the oil passage 15a or the oil passage 15b. The hydraulic oil supplied via the oil passage 15a or the oil passage 15b causes the bucket cylinder 15 to expand and contract, and the bucket cylinder 15 moves upward (in the direction in which the other end side of the bucket 12 is separated from the arm 11) or downward (other than the bucket 12). The end side is rotated in the direction of approaching the arm 11.

  The pilot valve group 120 (the right front / rear pilot valve 121, the right left / right pilot valve 122, the left front / rear pilot valve 123, the left left / right pilot valve 124) switches the flow of pilot hydraulic oil supplied to the direction switching valve group 110. is there.

  The right front / rear pilot valve 121 is interlocked with the right operation lever device 82 so as to switch the flow of pilot hydraulic oil when the right operation lever device 82 is operated in the front / rear direction. That is, the right front / rear pilot valve 121 is configured to be able to switch the spool of one direction switching valve in the direction switching valve group 110 to one or another position by operating the right operation lever device 82 in the front / rear direction. .

  The right and left pilot valve 122 is interlocked with the right operation lever device 82 so as to switch the flow of pilot hydraulic oil when the right operation lever device 82 is operated in the left and right direction. The configuration of the right and left pilot valves 122 is substantially the same as the configuration of the right and left pilot valves 121.

  The left front / rear pilot valve 123 is interlocked and connected to the left operation lever device 83 so as to switch the flow of pilot hydraulic oil when the left operation lever device 83 is operated in the front / rear direction. The configuration of the left front / rear pilot valve 123 is substantially the same as the configuration of the right front / rear pilot valve 121.

  The left and right pilot valve 124 is linked to the left operation lever device 83 so as to switch the flow of pilot hydraulic oil when the left operation lever device 83 is operated in the left and right direction. The configuration of the left and right pilot valves 124 is substantially the same as that of the right and left pilot valves 121.

  Thus, the operator can freely operate the work implement of the backhoe 1 by switching the direction of the hydraulic oil supplied to the plurality of hydraulic actuators by operating the right operation lever device 82 and the left operation lever device 83. Can do.

The pilot switching valve 130 switches a combination of pilot valves communicated with the direction switching valve. The pilot switching valve 130 is provided below the cockpit 81 (see FIGS. 1 and 2). The pilot switching valve 130 is disposed in the middle of the oil passage connecting the direction switching valve group 110 and the pilot valve group 120. The pilot switching valve 130 includes a casing 131 and a cylindrical rotary pool 132 that is rotatably inserted into the casing 131.
As shown in FIG. 5, the rotary pool 132 is configured to be able to be held at a predetermined switching position P (position A, position B, position C, position D).

  As shown in FIG. 4, the casing 131 of the pilot switching valve 130 includes an oil passage 111 b from the turning motor direction switching valve 111, an oil passage 112 b from the boom cylinder direction switching valve 112, and an arm cylinder direction switching valve 113. , An oil passage 114b from the bucket cylinder direction switching valve 114 (hereinafter simply referred to as “direction switching valve oil passage group 110b”), an oil passage 121a from the right front / rear pilot valve 121, and the right side An oil passage 122a from the left and right pilot valves 122, an oil passage 123a from the left front and rear pilot valves 123, and an oil passage 124a from the left and right left and right pilot valves 124 (hereinafter simply referred to as “pilot oil passage group 120a”), respectively. Connected. The rotary pool 132 of the pilot switching valve 130 is formed with an oil passage (not shown) that connects the directional switching valve oil passage group 110b and the pilot oil passage group 120a in a plurality of predetermined combinations.

When the switching position P of the rotary pool 132 is set to the position A, the pilot switching valve 130 is configured such that the directional switching valve oil passage group 110b communicates with the pilot oil passage group 120a by the rotary pool 132 in a predetermined combination. Composed. The combination of the right operating lever device 82 and the left operating lever device 83 based on a predetermined combination of the direction switching valve oil passage group 110b and the pilot oil passage group 120a at this time is referred to as an operation pattern A.
Furthermore, when the switching position P of the rotary pool 132 is set to the position B, the directional switching valve oil passage group 110b communicates with the pilot oil passage group 120a in a predetermined combination different from the combination in the operation pattern A by the rotary pool 132. Configured to be. A combination of a predetermined combination of the direction switching valve oil passage group 110b and the pilot oil passage group 120a at this time is defined as an operation pattern B.
Similarly, the operation pattern C is when the switching position P of the rotary pool 132 is the position C, and the operation pattern D is when the rotary pool 132 is the position D.

  Therefore, the pilot switching valve 130 can be selectively switched to one of the operation patterns A, B, C, or D by switching the rotary pool 132 to a predetermined switching position P. Configured. In this embodiment, the pilot switching valve 130 is a rotary type that rotates and switches the rotary pool 132, but is not limited to this, and the direction switching valve oil passage group 110b and the pilot oil passage group are not limited thereto. What is necessary is just to switch the oil path which each communicates with 120a.

  The pilot switching valve 130 includes a potentiometer 133 that is a switching position detection unit of the rotary pool 132. The potentiometer 133 is disposed on the pilot switching valve 130 so that the rotation center thereof is the rotation center of the rotary pool 132. The potentiometer 133 is configured to output a voltage having a different value depending on the switching position P. That is, the potentiometer 133 can arbitrarily set the detection position by setting the voltage value to be detected.

  The hydraulic pump 140 is driven by the engine 9 and discharges hydraulic oil. The hydraulic pump 140 is a variable displacement pump that can change the discharge amount by changing the swash plate angle of a movable swash plate (not shown). The hydraulic oil discharged from the hydraulic pump 140 is supplied to the direction switching valve group 110 and the pilot valve group 120 via the oil passage 140a.

  Next, the ECU 16 included in the backhoe 1 and the control unit 84e included in the display device 84 will be described in detail with reference to FIG.

  As shown in FIG. 6, the ECU 16 controls the engine 9, the hydraulic pump 140, and the like. The ECU 16 stores various programs for controlling the engine 9, the hydraulic pump 140, and the like. Further, the ECU 16 can perform predetermined calculations according to these programs and the like, and can store the results of the calculations.

  The ECU 16 may actually have a configuration in which a CPU, a ROM, a RAM, an HDD, and the like are connected by a bus, or may be configured by a one-chip LSI or the like.

  The ECU 16 is connected to various sensors and fuel injection devices (not shown) provided in the engine 9 and can control the engine 9.

  The ECU 16 is connected to the fuel gauge 17 and can acquire the remaining fuel amount Fl in a fuel tank (not shown) detected by the fuel gauge 17.

  The ECU 16 is connected to the water temperature gauge 18 and can acquire the coolant temperature T of the engine 9 detected by the water temperature gauge 18.

  The ECU 16 is connected to various sensors and actuators (not shown) provided in the hydraulic pump 140 and can control the hydraulic pump 140.

  The ECU 16 is connected to the control unit 84e of the display device 84, and transmits control signals for warning / error information, fuel remaining amount Fl, cooling water temperature T, etc. to the control unit 84e, and is input to the control unit 84e. It is possible to acquire a signal.

  Next, the control unit 84e included in the display device 84 will be specifically described.

  The control unit 84e controls the display device 84. The control unit 84e stores various programs for controlling the display device 84. The control unit 84e can perform a predetermined calculation according to these programs and the like, and has a storage unit 84f that stores the result of the calculation and the like.

  The control unit 84e may actually have a configuration in which a CPU, a ROM, a RAM, an HDD, and the like are connected by a bus, or may be configured by a one-chip LSI or the like. Moreover, although the control part 84e was set as the different structure from below-mentioned ECU16 in this embodiment, it is not limited to this, You may be comprised integrally with ECU16. In this case, the potentiometer 133 or a switch mechanism 134 described later is connected to the ECU 16.

  The control unit 84e is connected to the potentiometer 133, and can acquire the switching position P of the rotary pool 132 detected by the potentiometer 133.

  The control unit 84e can store the acquired switching position P of the rotary pool 132 and the calculated result in the storage unit 84f.

  The control unit 84e is connected to the LED display unit 84b, and can transmit a control signal to the LED display unit 84b. That is, the control unit 84e can turn on a predetermined LED in the LED display unit 84b by transmitting a control signal to the LED display unit 84b of the display device 84.

  The control unit 84e is connected to the ECU 16 and can acquire control signals such as the remaining fuel amount Fl, the cooling water temperature T, a warning, and error information from the ECU 16. The control unit 84e is connected to the liquid crystal display unit 84c and the liquid crystal operation unit 84d, can transmit a control signal to the liquid crystal display unit 84c, and can acquire an input signal from the liquid crystal operation unit 84d. That is, the control unit 84e can display information about the operating state of the backhoe 1 on the liquid crystal display unit 84c by transmitting a control signal to the liquid crystal display unit 84c.

As another embodiment of the switching position detecting means, as shown in FIG. 7, a switch mechanism 134 may be configured in which contacts are provided at positions corresponding to the positions A, B, C, and D in the casing 131 and the rotary pool 132. . When the rotary pool 132 is rotated to a predetermined switching position P, a contact point on the rotary pool 132 side and a predetermined contact point on the casing 131 are connected to detect the position of the rotary pool 132.
As described above, in the present embodiment, the switching position detecting means is the potentiometer 133 or the switch mechanism 134, but is not limited to this, and any means can be used as long as it can detect the position of the pilot switching valve 130.

  As another embodiment of the ECU 16 included in the backhoe 1 and the control unit 84e included in the display device 84 according to the present invention, as shown in FIG. 8, a fuel gauge 17 and a water temperature gauge 18 are connected to the control unit 84e. It is good also as a structure to be. With this configuration, the control unit 84e can acquire the remaining fuel amount Fl in a fuel tank (not shown) detected by the fuel gauge 17 and the cooling water temperature T of the engine 9 detected by the water temperature gauge 18. It is.

  Next, information displayed on the liquid crystal display unit 84c by the control unit 84e of the display device 84 will be described with reference to FIGS.

  As shown in FIG. 9A, when the control unit 84e acquires a warning / error control signal to be displayed from the ECU 16, the warning / error screen 85 including a predetermined figure and an error code based on the control signal. Is displayed on the liquid crystal display portion 84c.

  As shown in FIG. 9B, the control unit 84e displays the rotary pool in which the switching position P of the rotary pool 132 detected by the potentiometer 133 is stored in the storage unit 84f of the control unit 84e after a predetermined initial screen is displayed. In the case where the change is made in comparison with the switching position P of 132, an operation pattern screen 86 made up of predetermined character information and figures representing the operation pattern corresponding to the acquired switching position P of the rotary pool 132 is displayed on the liquid crystal display portion 84c. indicate. Note that the display of the operation pattern screen 86 is not limited to the display method in the present embodiment, and any operation pattern may be displayed as long as the operation pattern is highlighted by blinking display, enlarged display, or the like.

  As shown in FIG. 10A, the control unit 84e displays the excavation mode screen 87 displayed during excavation work on the liquid crystal display unit 84c after displaying the operation pattern screen 86. On the excavation mode screen 87, information on time, operation time, operation pattern, fuel remaining amount Fl, and cooling water temperature T is always displayed. That is, when the excavation mode screen 87 is displayed, the operation pattern is always displayed.

  As illustrated in FIG. 10B, when the control unit 84e acquires an input signal input by operating the menu button of the liquid crystal operation unit 84d, the control unit 84e displays a menu screen 88 on the liquid crystal display unit 84c. The menu screen 88 is configured such that a plurality of mode selection buttons are displayed, and the menu screen 88 can be switched to the corresponding mode screen by selecting the mode selection button.

  Below, the operation | movement aspect of the control part 84e of the display apparatus 84 comprised as mentioned above is demonstrated using FIG.

  The control unit 84e acquires signals about the switching position P of the rotary pool 132, the fuel remaining amount Fl, the cooling water temperature T, and warning / error information. If there is a warning / error, the screen is displayed on the warning / error LCD. 84c. The control unit 84e displays the operation pattern screen 86 on the liquid crystal display unit 84c after a predetermined initial screen display or when the switching position P of the rotary pool 132 is changed. The control unit 84e displays the excavation mode screen 87 after displaying the operation pattern screen 86 on the liquid crystal display unit 84c.

  Below, the control aspect of the control part 84e is demonstrated concretely.

  As shown in FIG. 11, the control unit 84e displays information on the liquid crystal display unit 84c in the following steps.

First, in step S110, the control unit 84e determines whether or not an initial screen needs to be displayed (whether or not information indicating that the work vehicle is powered on has been acquired from the ECU 16).
As a result, when it is determined that the initial screen needs to be displayed (information obtained when the power of the work vehicle is turned on is acquired from the ECU 16), the control unit 84e shifts the step to step S120.
On the other hand, if it is determined that there is no need to display (information on the power of the work vehicle being turned on has not been acquired from the ECU 16), the control unit 84e shifts the step to step S130.

  In step S120, the control unit 84e displays a predetermined initial screen.

In step S130, the control unit 84e acquires the switching position P of the rotary pool 132 of the pilot switching valve 130 detected by the potentiometer 133, the remaining fuel amount Fl detected by the fuel gauge 17, and the cooling water temperature detected by the water temperature gauge 18. T and warning / error information are acquired from the ECU 16 and stored in the storage unit 84f.
Further, in another embodiment shown in FIG. 8, the control unit 84e acquires the switching position P of the rotary pool 132 of the pilot switching valve 130 detected by the potentiometer 133, and acquires the remaining fuel amount Fl detected by the fuel gauge 17. Then, the coolant temperature T detected by the water temperature gauge 18 is acquired, and warning / error information is acquired from the ECU 16 and stored in the storage unit 84f.

In step S140, the control unit 84e determines whether there is a warning / error that needs to be displayed in the acquired warning / error information.
As a result, if it is determined that there is a warning / error that needs to be displayed, the control unit 84e shifts the step to step S150.
On the other hand, when it is determined that there is no warning / error that needs to be displayed, the control unit 84e shifts the step to step S160.

  In step S150, the control unit 84e displays a warning / error screen 85 about a warning / error that needs to be displayed on the liquid crystal display unit 84c based on the warning / error information based on the acquired and stored sensor (see FIG. 9 (a)).

In step S160, the control unit 84e determines whether or not the switching position P acquired and stored has been changed compared to the switching position P acquired and stored so far.
As a result, when it is determined that the switching position P has been changed compared to the switching position P acquired and stored so far, the control unit 84e shifts the step to step S170.
On the other hand, when it is determined that the switching position P has not been changed compared to the switching position P acquired and stored so far, the control unit 84e shifts the step to step S180.

  In step S170, the control unit 84e displays an operation pattern screen 86 representing the operation pattern corresponding to the switching position P of the rotary pool 132 of the pilot switching valve 130 acquired and stored on the liquid crystal display unit 84c (FIG. 9B). )reference).

In step S180, the control unit 84e displays the excavation mode screen 87 on the liquid crystal display unit 84c based on the acquired and stored switching position P of the rotary pool 132 of the pilot switching valve 130, the remaining fuel amount Fl, and the cooling water temperature T. Displayed (see FIG. 10A).
Thereafter, the control unit 84e returns the step to step S110.

  By repeating such steps, the control unit 84e changes the switching position P of the rotary pool 132 detected by the potentiometer 133 in comparison with the switching position P of the rotary pool 132 stored in the storage unit 84f. In this case, the operation pattern screen 86 representing the operation pattern corresponding to the new switching position P is displayed.

As described above, the directional control valve for the slewing motor, which is a plurality of directional switching valves for switching the flow of hydraulic oil supplied to the slewing motor 7, the boom cylinder 13, the arm cylinder 14, and the bucket cylinder 15 as a plurality of hydraulic actuators. 111, a direction switching valve group 110 including a boom cylinder direction switching valve 112, an arm cylinder direction switching valve 113, and a bucket cylinder direction switching valve 114, and the direction switching valve group 110. A pilot valve group 120 including a right front and rear pilot valves 121, a right and left pilot valves 122, a left front and rear pilot valves 123, and a left and right pilot valves 124, which are a plurality of pilot valves that respectively switch the flow of supplied pilot hydraulic oil A plurality of directional switching valve groups 110 are connected to each other. Directional switching valve oil passage group 110b composed of oil passage 111b, oil passage 112b, oil passage 113b, and oil passage 114b, and a plurality of pilot oil passages 120a and oil passages 122a connected to pilot valve group 120, respectively. , A pilot switching valve 130 for selectively switching a plurality of predetermined combinations from the pilot oil path group 120a including the oil path 123a and the oil path 124a and detecting a switching position P of the pilot switching valve 130. A potentiometer 133 serving as a switching position detecting means, a liquid crystal display section 84c serving as a display section disposed in the vicinity of the cockpit 81, and a control for causing the liquid crystal display section 84c to display an operation pattern corresponding to the switching position P under predetermined conditions. Part 84e.
With this configuration, the changeover position P of the pilot changeover valve 130 is changed to change the oil for the direction changeover valve which is an oil passage so that a predetermined combination of the direction changeover valve group 110 and the pilot valve group 120 is obtained. Since the road group 110b and the pilot oil path group 120a communicate with each other, the operation patterns A, B, C, and D are not changed by disturbances such as noise and overcurrent. Even if the switching position P of the pilot switching valve 130 cannot be confirmed from the cockpit 81, the operation pattern is displayed on the display device 84 in the vicinity of the cockpit 81, so that the driver can easily confirm the operation pattern. can do. Accordingly, it is possible to prevent malfunction and erroneous operation of the swing motor 7, the boom cylinder 13, the arm cylinder 14, and the bucket cylinder 15 that are hydraulic actuators.

Further, the control unit 84e has a storage unit 84f, stores the switching position P, and the switching position P newly detected by the potentiometer 133 serving as a switching position detecting means is stored in the storage unit 84f. In the case where a change is made in comparison with the above, a new switching position P is displayed on the display unit in a predetermined display form.
With this configuration, the operator can easily recognize that the predetermined combination has been switched. Therefore, erroneous operation of the swing motor 7, the boom cylinder 13, the arm cylinder 14, and the bucket cylinder 15 can be prevented.

The detection means is composed of a potentiometer 133.
By configuring in this way, the detection range of the potentiometer 133 can be arbitrarily set as each switching position P of the pilot switching valve 130. Therefore, even if the switching position P of the pilot switching valve 130 is different, the potentiometer This can be dealt with by simply changing the setting of the 133 detection range. Therefore, the production cost can be reduced by sharing the parts.

Moreover, a detection means is comprised from the switch mechanism 134 as another embodiment.
With this configuration, it is possible to reduce erroneous detection due to disturbances such as noise and overcurrent, and therefore it is possible to accurately display the operation patterns A, B, C, and D that are predetermined combinations. Therefore, erroneous operation of the swing motor 7, the boom cylinder 13, the arm cylinder 14, and the bucket cylinder 15 can be prevented.

  Next, the ECU 16 included in the backhoe 1 according to the present invention, the ECU according to the second embodiment of the display device 84, and the display device will be specifically described with reference to FIGS. 9 and 12 to 14.

The ECU and the display device according to the second embodiment are different from the ECU 16 and the display device 84 (see FIG. 6) in the first embodiment in that a seating sensor 20 is provided as means for detecting the driver's seating. Is a point.
Therefore, hereinafter, only differences from the ECU 16 and the display device 84 according to the first embodiment will be described, and members having substantially the same configurations as those of the ECU 16 and the display device 84 are denoted by the same reference numerals and description thereof will be omitted. .

  As shown in FIG. 12, the seating sensor 20 detects the driver's seating on the cockpit 81. The seating sensor 20 is disposed in the cockpit 81. The seating sensor 20 includes a seating sensor 20 a that detects the seating pressure Sp generated on the seating surface of the cockpit 81 when the pilot is seated on the cockpit 81, and a seating signal when the pilot is seated on the cockpit 81. The limit switch 20b is configured to output Sl.

  The case where the seating sensor 20 is the pressure sensor 20a will be described below.

  As shown in FIG. 12, when the seating sensor 20 is the pressure sensor 20a, the ECU 16 is connected to the pressure sensor 20a and acquires the seating pressure Sp of the cockpit 81 detected by the pressure sensor 20a. Is possible. Thereby, the ECU 16 determines that the driver is not seated in the cockpit 81 when the landing pressure Sp detected by the landing pressure sensor 20a is equal to or lower than a predetermined value, and the landing pressure Sp detected by the landing pressure sensor 20a. Can be determined that the operator is seated in the cockpit 81.

  Next, information displayed on the liquid crystal display unit 84c of the display device 84 will be described with reference to FIG.

  When the seating pressure Sp detected by the seating sensor 20 falls below a predetermined value and then exceeds a predetermined value, that is, after the driver leaves the cockpit 81, the control unit 84e of the display device 84 controls the pilot again. As shown in FIG. 9B, an operation pattern screen 86 made up of predetermined character information, graphics, and the like representing an operation pattern corresponding to the acquired switching position P of the rotary pool 132 is displayed as if seated in the seat 81. The display of the operation pattern is not limited to the display in the present embodiment, and any operation pattern may be specified as long as the operation pattern is highlighted by blinking display, enlarged display, or the like.

  Hereinafter, the control mode of the control unit 84e when the seating sensor 20 is the pressure sensor 20a will be specifically described with reference to FIG.

  The control unit 84e displays information on the liquid crystal display unit 84c in the following steps.

  Steps S110 to S120 are the same as those in the first embodiment, and a description thereof will be omitted.

  In step S230, the control unit 84e acquires the switching position P of the rotary pool 132 of the pilot switching valve 130 detected by the potentiometer 133, the remaining fuel amount Fl detected by the fuel gauge 17, and the cooling water temperature detected by the water temperature gauge 18. T, warning / error information, and pressure Sp detected by the pressure sensor 20a are acquired from the ECU 16 and stored in the storage unit 84f.

  Steps S140 to S150 are the same as those in the first embodiment, and a description thereof will be omitted.

In step S160, the control unit 84e determines whether or not the switching position P acquired and stored has been changed compared to the switching position P acquired and stored so far.
As a result, when it is determined that the switching position P has been changed compared to the switching position P acquired and stored so far, the control unit 84e shifts the step to step S170.
On the other hand, when it is determined that the switching position P has not been changed compared to the switching position P acquired and stored so far, the control unit 84e shifts the step to step S270.

  Steps S170 to S180 are the same as those in the first embodiment, and a description thereof will be omitted.

In step S270, the control unit 84e determines whether the acquired and stored arrival pressure Sp has become equal to or higher than the predetermined value after the arrival pressure Sp becomes equal to or lower than the predetermined value (whether the arrival pressure Sp has changed).
As a result, when it is determined that the arrival pressure Sp becomes equal to or higher than the predetermined value after the arrival pressure Sp becomes equal to or lower than the predetermined value (the arrival pressure Sp fluctuated), the control unit 84e shifts the step to Step S280.
On the other hand, when it is determined that the arrival pressure Sp has not reached the predetermined value again after the arrival pressure Sp has become the predetermined value or less (the arrival pressure Sp has not changed), the control unit 84e shifts the step to step S180.

In step S280, the control unit 84e displays an operation pattern screen 86 representing the operation pattern corresponding to the switching position P of the rotary pool 132 of the pilot switching valve 130 acquired and stored on the liquid crystal display unit 84c (FIG. 9B). reference).
Thereafter, the controller 84e shifts the step to step S180.

  By repeating the above steps, the control unit 84e determines that the landing pressure Sp of the cockpit 81 detected by the landing pressure sensor 20a becomes equal to or higher than a predetermined value after being lower than or equal to the predetermined value (the arrival pressure Sp varies). In the case), it is determined that the pilot has left the pilot seat 81 or the pilot has changed, and the operation pattern screen 86 is displayed on the liquid crystal display portion 84c.

As described above, the seating sensor 20 that detects the seating pressure Sp when the operator is seated on the cockpit 81 is further provided, and the control unit 84e stores the seating pressure Sp in the storage unit 84f, and the seating pressure Sp is predetermined. When the value becomes equal to or higher than the predetermined value again after the value becomes lower than the value, the switching position P is displayed on the liquid crystal display part 84c which is a display part in a predetermined display form.
By configuring in this way, it is determined that the operator has left the seat due to fluctuations in the landing pressure Sp, or the operator has been replaced, and the operation pattern is displayed in a predetermined display form, so that the operation pattern is not misidentified. . Therefore, erroneous operation of the swing motor 7, the boom cylinder 13, the arm cylinder 14, and the bucket cylinder 15 can be prevented.

  Next, the case where the seating sensor 20 is the limit switch 20b will be described.

  As shown in FIG. 12, when the seating sensor 20 is the limit switch 20b, the ECU 16 is connected to the limit switch 20b and can acquire the seating signal S1 output from the limit switch 20b. Thus, when the seating signal S1 output from the limit switch 20b is not detected, the ECU 16 determines that the driver is not seated in the cockpit 81 and detects the seating signal S1 output from the limit switch 20b. If it is, it can be determined that the operator is seated in the cockpit 81.

  Next, information displayed on the liquid crystal display unit 84c of the display device 84 will be described with reference to FIG.

  When the control unit 84e of the display device 84 detects the seating signal S1 from the state where the seating signal S1 output from the limit switch 20b is not detected, that is, after the driver leaves the cockpit 81, the driver again As shown in FIG. 9B, the user is seated in the cockpit 81, and an operation pattern screen 86 made up of predetermined character information and graphics representing the operation pattern corresponding to the acquired switching position P of the rotary pool 132 is displayed. . The display of the operation pattern is not limited to the display in the present embodiment, and any operation pattern may be specified as long as the operation pattern is highlighted by blinking display, enlarged display, or the like.

  Below, the control aspect of the control part 84e in case the seating sensor 20 is the limit switch 20b is demonstrated concretely using FIG.

  The control unit 84e displays information on the liquid crystal display unit 84c in the following steps.

  Steps S110 to S120 are the same as those in the first embodiment, and a description thereof will be omitted.

  In step S330, the control unit 84e acquires the switching position P of the rotary pool 132 of the pilot switching valve 130 detected by the potentiometer 133, the remaining fuel amount Fl detected by the fuel gauge 17, and the cooling water temperature detected by the water temperature gauge 18. T, warning / error information, and the seating signal S1 output from the limit switch 20b are acquired from the ECU 16 and stored in the storage unit 84f.

  Steps S140 to S150 are the same as those in the first embodiment, and a description thereof will be omitted.

In step S160, the control unit 84e determines whether or not the switching position P acquired and stored has been changed compared to the switching position P acquired and stored so far.
As a result, when it is determined that the switching position P has been changed compared to the switching position P acquired and stored so far, the control unit 84e shifts the step to step S170.
On the other hand, when it is determined that the switching position P has not been changed compared to the switching position P acquired and stored so far, the control unit 84e shifts the step to step S370.

  Steps S170 to S180 are the same as those in the first embodiment, and a description thereof will be omitted.

In step S370, the control unit 84e determines whether or not the seating signal Sl is detected from a state where the seating signal Sl is not detected.
As a result, when it is determined that the seating signal Sl is detected from the state where the seating signal Sl is not detected, the control unit 84e shifts the step to step S280.
On the other hand, if it is determined that the seating signal Sl is not detected when the seating signal Sl is not detected, the control unit 84e shifts the step to step S180.

In step S280, the control unit 84e displays an operation pattern screen 86 representing the operation pattern corresponding to the switching position P of the rotary pool 132 of the pilot switching valve 130 acquired and stored on the liquid crystal display unit 84c (FIG. 9B). reference).
Thereafter, the controller 84e shifts the step to step S180.

  The controller 84e repeats the above steps, and when the seating signal Sl is detected from the state where the seating signal Sl output from the limit switch 20b is not detected, the driver once leaves the cockpit 81. Alternatively, it is determined that the driver has changed, and the operation pattern screen 86 is displayed on the liquid crystal display unit 84c.

7 Swing motor (hydraulic actuator)
9 Engine 13 Boom cylinder (hydraulic actuator)
14 Arm cylinder (hydraulic actuator)
15 Bucket cylinder (hydraulic actuator)
81 cockpit 84c liquid crystal display unit 84e control unit 110 directional switching valve group 110b directional switching valve oil passage group 111 slewing motor directional switching valve 112 boom cylinder directional switching valve 113 arm cylinder directional switching valve 114 bucket cylinder directional switching Valve 120 Pilot valve group 120a Pilot oil passage group 121 Right front / rear pilot valve 122 Right left / right pilot valve 123 Left front / rear pilot valve 124 Left left / right pilot valve 130 Pilot switching valve 133 Potentiometer P Switching position

Claims (5)

A plurality of directional control valves that respectively switch the flow of hydraulic fluid supplied to the plurality of hydraulic actuators;
A plurality of pilot valves provided for each of the plurality of directional control valves, each of which switches a flow of pilot hydraulic oil supplied to the plurality of directional control valves;
Pilot switching for selectively switching a plurality of oil passages respectively connected to the plurality of directional switching valves and a plurality of oil passages respectively connected to the plurality of pilot valves from a plurality of predetermined combinations. A valve,
Switching position detecting means for detecting a switching position of the pilot switching valve;
A display unit arranged in the vicinity of the cockpit,
A control unit that displays the switching position on the display unit under a predetermined condition;
A work vehicle comprising: The controller is
Having a storage unit,
The switching position is stored, and when the switching position newly detected by the switching position detecting means is changed in comparison with the switching position stored in the storage unit, the new switching position is set to a predetermined value. The work vehicle according to claim 1, wherein the work vehicle is displayed on the display unit in a display form. A pressure sensor is further provided to detect the pressure when the operator is seated in the cockpit,
The control unit stores the applied pressure by the storage unit, and when the applied pressure becomes equal to or higher than a predetermined value again after the applied pressure becomes equal to or lower than a predetermined value, the switching position is displayed on the display unit in a predetermined display form. The work vehicle according to claim 1 or 2, wherein the work vehicle is displayed. The detection means includes
The work vehicle according to any one of claims 1 to 3, comprising a potentiometer. The detection means includes
The work vehicle according to any one of claims 1 to 3, comprising a switch mechanism.

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