JPH04327615A - Abnormality diagnosis construction of working vehicle - Google Patents

Abstract

PURPOSE:To provide a working vehicle provided with a self-diagnosis means, which diagnoses if there is any abnormality in the vehicle, whereby said means is not actuated inadvertently and the result detected by said means can be easily understood. CONSTITUTION:There are provided a input unit 29 provided with a plurality of terminals and a connector 30 which can effect the short-circuit of a specific terminal of a plurality of terminals, wherein if the connector 30 is inserted into the unit 29, a self-diagnosis means is automatically actuated based on the signal from the terminal of the input unit. And a plurality of lamps 31-35 are provided to display the working conditions of a vehicle during an ordinary work, whereby when the means is actuated, the result detected by the means can be displayed by the lamps 31-35.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality diagnosis structure for a working vehicle, which is equipped with self-diagnosis means for detecting the presence or absence of an abnormality in each part.

0002

[Prior Art] Some backhoes, which are an example of work vehicles, are equipped with self-diagnosis means to detect by themselves whether or not there is an abnormality in the backhoe device, swivel table, etc. In this case, the service engineer performs the following operations. In other words, the service person brings a display device dedicated to abnormality detection that displays which part of the backhoe has an abnormality, connects this display device to the backhoe's self-diagnosis means, and activates the self-diagnosis means. You operate it by turning on a switch (located on the side of the backhoe). This results in
The self-diagnosis means operates to sequentially diagnose the presence or absence of an abnormality in each part of the backhoe, and based on the abnormality detection signal from the self-diagnosis means, a lamp corresponding to the abnormality part is lit on the display device.

0003

[Problems to be Solved by the Invention] Abnormality detection using the above-described self-diagnosis means is not something that a general backhoe user would do because it is equipped with a dedicated display device. This is set to be performed by the manufacturer's service personnel. Therefore, if a general user accidentally turns on the start switch without connecting a dedicated display device, there is a risk that the self-diagnosis means will go out of control and malfunction. Furthermore, it is inconvenient for a service person to prepare a dedicated display device and carry it around with him or her, so there is room for improvement in terms of maintainability. An object of the present invention is to prevent a general user from erroneously activating the self-diagnosis means, and to prevent a service person from having to carry a dedicated display device.

0004

[Means for Solving the Problems] The feature of the present invention is that the abnormality diagnosis structure for a work vehicle as described above is constructed as follows. In other words, it is equipped with an input section equipped with multiple terminals and a self-diagnosis means for detecting the presence or absence of an abnormality in each part of the work vehicle, and a connector that short-circuits a specific terminal among the multiple terminals can be attached or detached from the input section. The self-diagnosis means is configured as desired and includes a starting means for starting the self-diagnosis means based on a signal from a terminal of the input section short-circuited by the connector,
The apparatus includes a plurality of lamps that display the working status of each part during normal work, and a display means that displays the detection results of the self-diagnosis means on the lamps when the self-diagnosis means is activated.

[0005]

[Operation] With the above-described configuration, when detecting an abnormality, a service person only needs to bring a small connector, and there is no need to bring a large dedicated display device. Then, all you have to do is attach the connector you brought to the input section on the aircraft side. As a result, the self-diagnosis means starts operating in response to a signal from the short-circuited terminal in the input section, sequentially diagnoses whether or not there is an abnormality in each part, and the abnormality detection result is displayed on the lamp. This lamp is not dedicated to abnormality detection, but is an existing lamp that indicates the work status during normal work (for example, whether the aircraft is moving forward or backward). Therefore, there is no need to separately equip a lamp exclusively for abnormality detection.

[0006] When one lamp has two functions in this way, the meaning displayed by the lamp during normal work and the meaning displayed by the lamp when an abnormality is detected may not always match. However, since abnormality detection using a connector is assumed to be performed by a service person, it is sufficient for the service person to understand both the meaning during normal work and the meaning when an abnormality is detected. As long as the general user only understands the meaning during normal work, there will be no particular problem. In addition, even if there is no connector, if the service person understands which terminals of the input section should be shorted, the self-diagnosis means can be activated by shorting the specified terminals using an existing electric wire, etc. It is possible to do so. Furthermore, since the device that activates the self-diagnosis means is not a simple switch type that anyone can operate, but a type that attaches a connector to the input section, it is difficult for ordinary users who do not have a connector to activate the self-diagnosis means. , the self-diagnosis means will not be activated inadvertently.

[0007]

[Effects of the Invention] As described above, by adopting a type in which a connector is attached to the input section rather than a simple switch type that anyone can operate, ordinary users who do not have a connector can inadvertently use the self-diagnosis method. It was possible to prevent the self-diagnosis means from operating abnormally due to erroneous operation. In addition, since the existing lamps installed on the aircraft side are used to display the detection results without using a display device dedicated to abnormality detection, service personnel only need to bring the connector. This makes it possible to reduce the cost of the display device, and also makes maintenance easier because service personnel do not need to carry around the display device.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. FIG. 8 shows the entire side view of a backhoe, which is an example of a working vehicle, in which a swivel base 2 is supported on the top of a rubber crawler type traveling device 1, and a backhoe device 3 is provided at the front of the swivel base 2. There is. This backhoe device 3 includes a boom 4 that is driven to swing up and down by a hydraulic cylinder 11;
An arm 5 that is driven to swing back and forth by a hydraulic cylinder 12
and a bucket 6 which is driven to rake and swing by a hydraulic cylinder 13. As shown in FIG. 1, a hydraulic motor 14 is provided for driving the swivel base 2 to rotate.

The boom 4 in the backhoe device 3 is shown in FIG.
As shown in , a second boom 4b is swingably connected around an axis P1 at the front end of the first boom 4a which is driven to swing up and down, and a support bracket 4c is connected around an axis P2 at the front end of the second boom 4b. are connected to each other so as to be swingable, and an arm 5 is connected to this support bracket 4c. An interlocking link 8 is installed across the first boom 4a and the support bracket 4c to form a four-parallel link, and by swinging the second boom 4b with the hydraulic cylinder 7, the arm 5 and The bucket 6 is configured to be able to move left and right in parallel.

As shown in FIG. 1, the control valve 21 for the hydraulic cylinder 11 of the boom 4 and the hydraulic cylinder 12 of the arm 5
A control valve 22 for the bucket 6, a control valve 23 for the hydraulic cylinder 13 of the bucket 6, and a control valve 24 for the hydraulic motor 14 of the swivel base 2 are provided. These control valves 21 to 24
It is a 3-position switching type electromagnetic proportional pressure reducing valve type, and the flow rate can be controlled. Further, a three-position switching type control valve 25 for the hydraulic cylinder 7 of the second boom 4b in the boom 4 is provided.

As shown in FIGS. 1 and 8, the swivel base 2 is provided with a right operating lever 9 and a left operating lever 10. As shown in FIGS. The right and left operating levers 9, 10 can be operated forward, backward, left, and right, and are equipped with a potentiometer 15 for detecting the operating position of the right operating lever 9 in the longitudinal direction, a potentiometer 16 for detecting the operating position in the left and right directions, and a potentiometer 16 for detecting the operating position of the right operating lever 9 in the longitudinal direction. A potentiometer 17 that detects the operating position of the operating lever 10 in the front-back direction and a potentiometer 18 that detects the operating position in the left-right direction are provided. Operation signals from each of the potentiometers 15 to 18 are input to the control device 19. Further, an operating pedal 26 is provided at the lower front portion of the swivel base 2, and an operating signal from this operating pedal 26 is input to the control device 19.

With the above configuration, when the right operating lever 9 is operated forward or backward, the control valve 21 for the boom 4 is operated to the lowering side or to the ascending side, and when the right operating lever 9 is operated to the right or left, the control valve 23 is operated to remove the soil from the bucket 6. It is operated to the side or the scraping side. When the left operation lever 10 is operated forward or backward, the control valve 22 is operated to the raising side or the scraping side of the arm 5, and when it is operated to the right or left, the control valve 24 is operated to the right side or the left side. Further, by stepping on the operating pedal 26 to the right or left, the control valve 25 is operated to the right or left movement side of the second boom 4b.

In the above operation, each potentiometer 15 to 18 for the right and left operating levers 9, 10 detects not only the operating direction of the right and left operating levers 9, 10, but also the amount of operation from their neutral position. There is. As a result, the larger the amount of operation of the right and left operation levers 9, 10, the more the control valve 21
24 are operated to increase the flow rate, that is, the larger the right and left operating levers 9 and 10 are operated, the hydraulic cylinders 11 to 13 and the hydraulic motor 14 are configured to operate at a higher speed.

As shown in FIGS. 7 and 8, a control post 20 is provided at the front of the swivel base 2, and control levers 27 for the left and right traveling devices 1 are provided on the left and right sides of the control post 20.
R, 27L are provided. And control post 20
The first lamp 31 is on the rear surface, and the second lamp is on the top surface of the control post 20.
Lamp 32, third lamp 33, fourth lamp 34 and fifth lamp
A lamp 35 is provided.

Next, the functions of the first to fifth lamps 31 to 35 during normal work will be explained. In this backhoe, the objects to be operated by the right and left operating levers 9 and 10 (
It has an operation pattern change function to change the boom 4, arm 5, etc.). In other words, when pattern A is selected, when the right and left operating levers 9 and 10 are operated, the operation is performed in the state described above. If pattern B is selected, the arm 5 will be operated by operating the right operating lever 9 back and forth, and the bucket 6 will be operated by operating the right operating lever 9 from side to side. A plurality of such different operation patterns are set, and when the representative pattern A described above is selected, the first lamp 31 blinks for a predetermined period of time when the engine is started.

A locking mechanism (not shown) is provided to fix the right and left operating levers 9, 10 from their neutral positions when a worker gets on or off the swivel table 2. . When the right and left operating levers 9 and 10 are fixed by this locking mechanism, the third lamp 33 lights up.

In this backhoe, from the normal working state of the backhoe device 3 shown in FIG. It is equipped with an offset function (which puts the arm 5 and bucket 6 in the most deep position). Therefore, in the normal working state shown in FIG. 8, when the operating switch (not shown) for the offset function is operated, the backhoe device 3 is automatically folded into the above-mentioned state, and during this folding, the second lamp 32 is lit. Returning the backhoe device 3 from this folded state to the normal working state shown in FIG. 8 is performed by operating the right and left operating levers 9 and 10. (not shown), the second boom 4b is automatically returned to its original position before folding without operating the operating pedal 26, and during this automatic return operation, the fourth lamp 34 is It's lit. In addition, if a fuse blows out or an abnormality occurs in various switches or electromagnetic solenoids during normal work, the 5th lamp 3
5 is constructed so that it lights up.

Next, the flow of the self-diagnosis function of this backhoe will be explained with reference to flowcharts shown in FIGS. 2 to 6. As shown in FIGS. 1 and 8, an input section 29 including a plurality of terminals (not shown) is provided inside the opening/closing section below the driver's seat 28 of the swivel base 2. And the control device 19
To activate the self-diagnosis means (not shown) inside, open the opening and closing section and insert the connector 30 into the input section 29. As a result, when a specific one of the terminals of the input section 29 is short-circuited and a signal from the short-circuited terminal is input to the control device 19, the self-diagnosis means starts operating (corresponding to the starting means), It will be in a temporary standby state.

In this state, if the switching button 9a of the right operating lever 9 shown in FIG. 1 is pressed once (step S
1), the first lamp 31 shown in FIG. 7 is turned on (step S2). This is the control valve 23 for the bucket 6 shown in FIG.
This means a state in which the circuit relationship between the two is diagnosed. after that,
Based on the above-mentioned pattern A, the right operating lever 9 is operated left and right to perform a full stroke operation of the bucket 6 back and forth (step S3). During this operation, the self-diagnosis means
The circuit relationship of the control valve 23 for the bucket 6 is diagnosed. If there is an abnormality, the fifth lamp 35 shown in FIG. 7 is lit (step S4) (corresponding to display means).

Next, when the switching button 9a of the right operating lever 9 is pressed again (step S5), the first and second lamps 31 and 32 shown in FIG. 7 are turned on (step S6).
). This means that the potentiometer 39 for the bucket 6 shown in FIG. 8 is being diagnosed. Thereafter, the right operating lever 9 is operated to the right to operate the bucket 6 to the most unloaded position (the position where it is swung furthest to the right in the paper) (step S7
). During this operation, the potentiometer 39 for the bucket 6 is diagnosed by the self-diagnosis means. If there is an abnormality, the fifth lamp 35 is turned on (step S8).

Next, when the switching button 9a of the right operating lever 9 is pressed again (step S9), the second lamp 32 shown in FIG. 7 lights up (step S10). this is,
This means a state in which the circuit relationship of the control valve 22 for the arm 5 shown in FIG. 1 is diagnosed. Thereafter, the left operating lever 10 is operated back and forth based on the above-mentioned pattern A to perform a full stroke operation of the arm 5 back and forth (step S11). During this operation, the circuit relationship of the control valve 22 for the arm 5 is diagnosed by the self-diagnosis means. Then, if there is an abnormality, the fifth lamp 35 lights up (step S12).
.

Next, when the switching button 9a of the right operating lever 9 is pressed again (step S13), the second and third lamps 32 and 33 shown in FIG. 7 are turned on (step S13).
14). This means that the potentiometer 38 for arm 5 shown in FIG. 8 is being diagnosed. Thereafter, the left operating lever 10 is operated forward to operate the arm 5 to the highest position (step S15). During this operation, the potentiometer 38 for the arm 5 is diagnosed by the self-diagnosis means. If there is an abnormality, the fifth lamp 35 is turned on (step S16).

Next, when the switching button 9a of the right operating lever 9 is pressed again (step S17), the third lamp 33 shown in FIG. 7 lights up (step S18). This means a state in which the circuit relationship of the control valve 25 for the second boom 4b shown in FIG. 1 is diagnosed. Thereafter, the user depresses the operating pedal 26 shown in FIG. 1 left and right to operate the second boom 4b in a full stroke left and right (step S19). During this operation, the self-diagnosis means detects that the second boom 4
The circuit relationship of the control valve 25 for B is diagnosed. If there is an abnormality, the fifth lamp 35 is turned on (step S20).

Next, when the switching button 9a of the right operating lever 9 is pressed again (step S21), the third and fourth lamps 33 and 34 shown in FIG. 7 are turned on (step S21).
22). This means that the potentiometer 37 for the second boom 4b shown in FIG. 8 is being diagnosed. After that, press the operation pedal 26 shown in FIG. 1 to the right to operate the second
The boom 4b is operated to the rightmost position (step S23). During this operation, the self-diagnosis means detects that the second boom 4
Potentiometer 37 for b is diagnosed. If there is an abnormality, the fifth lamp 35 is turned on (step S24).

Next, when the switching button 9a of the right operating lever 9 is pressed again (step S25), the fourth lamp 34 shown in FIG. 7 lights up (step S26). This means a state in which the circuit relationship of the control valve 21 for the first boom 4a shown in FIG. 1 is diagnosed. Thereafter, the right operating lever 9 is operated back and forth to operate the first boom 4a in a full stroke (step S27). During this operation, the circuit relationship of the control valve 21 for the first boom 4a is diagnosed by the self-diagnosis means. If there is any abnormality, the 5th lamp 3
5 is lit (step S28).

Next, when the switching button 9a of the right operating lever 9 is pressed again (step S29), the first and fourth lamps 31 and 34 shown in FIG. 7 are turned on (step S29).
30). This means that the potentiometer 36 for the first boom 4a shown in FIG. 8 is being diagnosed. Thereafter, the right operating lever 9 is operated later to operate the first boom 4a to the highest position (step S31). During this operation, the self-diagnosis means diagnoses the potentiometer 36 for the first boom 4a. If there is an abnormality, the fifth lamp 35 is turned on (step S32).

Next, the process returns to step S1 shown in FIG. 2, and when the switching button 9a of the right operating lever 9 is pressed again, the process moves to step S2, and the same diagnosis is repeated. If the connector 30 shown in FIG. 1 is removed from the input section 29, the self-diagnosis as described above is interrupted and the normal state returns. If the connector 30 is not provided, the self-diagnosis means will be activated in the same manner as described above by short-circuiting the terminals of the input section 29 that are short-circuited by the connector 30 with an electric wire or the like.

[0028] Although reference numerals are written in the claims section for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

[Figure 1] A circuit diagram showing the linkage status of each hydraulic cylinder and hydraulic motor control valve, right and left operating levers, each lamp, input section, connector, etc.

[Figure 2] Flowchart showing the bucket-related portion of the self-diagnosis means

[Fig. 3] Flowchart showing bucket and arm related parts in self-diagnosis means

[Fig. 4] Flowchart showing the relationship between the arm and the second boom in the self-diagnosis means

FIG. 5 is a flowchart showing a portion related to the second boom and the first boom in the self-diagnosis means.

[Fig. 6] Flowchart showing the first boom-related part in the self-diagnosis means

[Figure 7] Perspective view of the control post equipped with a lamp, viewed diagonally from behind.

[Figure 8] Overall side view of backhoe

[Explanation of symbols]

Claims (1)

[Claims] [Claim 1] Input section (29) equipped with a plurality of terminals.
and self-diagnosis means for detecting the presence or absence of an abnormality in each part of the working vehicle, and a connector (30) for short-circuiting a specific terminal among the plurality of terminals is configured to be detachably attached to the input section (29). and a starting means for starting the self-diagnosis means based on a signal from a terminal of the input section (29) short-circuited by the connector (30),
Multiple lamps (31), (32), (33), (34), (35) that display the working status of each part during normal work.
When the self-diagnosis means is activated, the detection results of the self-diagnosis means are transmitted to the lamps (31) and (32).
, (33), (34), and (35).