JPH09256422A - Failure diagnostic device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a failure diagnostic device capable of showing the error data of parts in the order of abnormality occurrence and easily estimating a fundamental cause for an abnormality, upon the occurrence of an abnormality in a plurality of parts mounted on a construction machine. SOLUTION: This failure diagnostic device is formed out of a control means 3 having a memory part 2 for storing the error code of each part such as angle sensors 7 and 8 in a time series order, and a portable failure diagnostic means 6 detachably connected to the control means 3 via a connector 4 and formed to have a display part 5. When an abnormality occurs in the arm angle sensor 8 after the occurrence of an abnormality in the boom angle sensor 7, the error codes of the abnormalities are detected with the control means 3 and stored in the memory part 2 in a time series order. Then, a servicing person connects his/her failure diagnostic means 6 to the control means 3 via the connector 4. The error codes stored in the memory part 2 are thereby read out and shown on the display part 5 of the failure diagnostic means 6 in a time series order.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure diagnosis device for a construction machine, which performs a failure diagnosis of a plurality of parts such as electronic parts and hydraulic parts mounted on a construction machine such as a hydraulic excavator.

[0002]

2. Description of the Related Art Conventionally, a control means for detecting abnormality of the parts based on electric signals from a plurality of parts such as electronic parts and hydraulic parts mounted on a construction machine, and a connector to the control means. 2. Description of the Related Art There is known a failure diagnosis device for a construction machine, which includes a portable failure diagnosis means that is detachably connected. In such a known failure diagnosis device, when an abnormality occurs in an electric system of an arbitrary electronic component, for example, a boom angle sensor that detects a boom angle, error data is stored in a control unit according to a predetermined priority order. When the maintenance person in charge of maintenance of the construction machine connects the portable failure diagnosis means to the control means, the error data is read from the control means and displayed on the display unit of the failure diagnosis means. Therefore, when the boom angle sensor has a disconnection abnormality and the sensor power supply is short-circuited, and then an abnormality of another angle sensor is detected, when the failure diagnosis means is connected to the control means, the sensor power supply, boom Each error data of the sensor and other sensors is displayed based on the priority order determined by the control means.

As prior art related to this type of failure diagnosis apparatus, for example, those described in Japanese Patent Publication No. 7-18780 and Japanese Utility Model Publication No. 7-23718 can be cited.

[0004]

By the way, in the above-mentioned conventional failure diagnosis apparatus for construction machinery, when an abnormality occurs in a plurality of parts, these error data are displayed based on the priority order determined by the control means. Therefore, there is a problem that the maintenance staff cannot specify which component is the abnormality that occurred first and it is difficult to estimate the root cause of the abnormality. For example, when each error code of the sensor power supply, boom sensor, other sensor, etc. is displayed, it is necessary to inspect each of these sensor power supply, boom sensor, other sensor, etc., which is troublesome and considerably time consuming. There was a problem that it took.

The present invention has been made in view of the above-mentioned circumstances of the prior art, and an object thereof is to detect error data of a plurality of parts mounted on a construction machine when the parts have abnormalities. It is an object of the present invention to provide a failure diagnosis device for a construction machine, which can be displayed in the order of detection and can easily estimate the root cause of the abnormality.

[0006]

According to the present invention, when an abnormality occurs in a plurality of parts, the error data of these parts are stored in a time-series order and the error data are stored as needed. It will be displayed in series. In this way, for example, when a boom angle sensor has a wire breakage abnormality and the sensor power supply is short-circuited, and then another angle sensor malfunctions, the boom angle sensor malfunctions, the sensor power supply short-circuits, and other Each error data of the angle sensor is stored in the order in which the abnormality occurs, and by reading and displaying the stored error data, the component in which the abnormality first occurs is the boom angle sensor, and then the short circuit of the power supply for the sensor and It is possible to instantly confirm that an abnormality has occurred in another angle sensor, systematically grasp the history of a series of abnormality occurrences, and easily infer the root cause of the abnormality.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A failure diagnosis device for a construction machine according to the present invention is provided with a control means for detecting an abnormality based on electric signals from a plurality of parts mounted on the construction machine. A storage unit is provided for storing the error data in order of time series.

The error data stored in the storage section is
The time series may be displayed on a monitor or the like installed in the cab of the construction machine, but the time series may be displayed on the display unit of the portable failure diagnosis means detachably connected to the control means through the connector. Then, it is convenient for the maintenance staff who is in charge of maintenance of the construction machine.

[0009]

Embodiments will be described with reference to the drawings.
1 is a block diagram of a failure diagnosis device for a construction machine according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing stored contents of a storage unit provided in the failure diagnosis device of FIG. 1, and FIG. 3 is a failure of FIG. It is explanatory drawing which looked at the inside of the cab of the construction machine provided with the diagnostic device from the front.

As shown in FIG. 1, a failure diagnosis apparatus 1 according to the present embodiment has a controller 3 having a storage unit 2 and a portable failure detachably connected to the controller 3 via a connector 4. The portable failure diagnosis means 6 has a display unit 5. A boom angle sensor 7, an arm angle sensor 8 and a plurality of components such as other electronic components and hydraulic components (not shown) are electrically connected to the control unit 3, and the control unit 3 detects an abnormality in these components. In addition, the monitor 10 having the other display unit 9 is also electrically connected. The control unit 3, the components such as the connector 4, the sensors 7 and 8 and the monitor 10 other than the failure diagnosis unit 6 and the monitor 10 are arranged in the construction machine.
In the operator's cab of the hydraulic excavator shown in FIG.
A monitor 10 is installed in front of the monitor 10.
Data such as the distance from the turning center of the hydraulic excavator to the bucket and the height of the bucket is displayed on the display unit 9. On the other hand, the failure diagnosis means 6 is normally disconnected from the connector 4 and carried by a maintenance person in charge of maintenance of the construction machine.

As shown in FIG. 2, the control means 3 has a program for sequentially writing to the larger numbers of the addresses A1 to An of the storage unit 2 in the order in which the abnormality of each component such as the angle sensors 7 and 8 occurs. As a result, the storage unit 2 stores a plurality of error codes in order of time series. For example, the error code of the first occurrence of the abnormality is stored in the first address A1, the error code of the second occurrence of the abnormality is stored in the second address A2, and the same as the nth occurrence. The abnormal error code is stored in the nth address An.

In this embodiment, for example, when the arm angle sensor 8 is broken after the boom angle sensor 7 is broken, the control means 3 detects these breaks and first stores them. The error code "40" of the boom angle sensor 7 is stored in the first storage address A1 of the part 2, and then the error code "7" of the arm angle sensor 8 is stored in the second storage address A2.
"0" is stored. When the maintenance worker connects the failure diagnosis means 6 to the control means 3 via the connector 4, the control means 3
The data stored in the storage unit 2 of the
Error code "40" for address A1, address A2
The error codes "70" are displayed in chronological order in the order of occurrence of abnormality.

In the embodiment thus constructed, when an abnormality occurs in a plurality of parts such as the angle sensors 7 and 8, the error code is displayed on the display unit 5 of the failure diagnosis means 6 in the order in which the abnormality occurs. The maintenance staff in charge of maintenance of the construction machine can systematically grasp the history of a series of abnormalities, and can easily estimate the root cause of the abnormalities and greatly shorten the repair time.

In the above embodiment, the error code of each component is displayed in time series on the display unit 5 of the failure diagnosis means 6 carried by the maintenance personnel.
It is also possible to display in time series on the display unit 9 of 0. In this case,
The failure diagnosis means 6 is not always necessary and may be omitted.

[0015]

As described above, according to the present invention,
When an error occurs in multiple parts mounted on a construction machine, a series of error occurrence history can be systematically grasped based on the error data displayed in the order in which the error occurred. The root cause is easily inferred,
The defective part can be repaired quickly.

Further, if the portable failure diagnosing means is connected to the connector to display the error data, the error data can be utilized when the maintenance personnel carrying the failure diagnosing means repairs the parts.

[Brief description of drawings]

FIG. 1 is a block diagram of a failure diagnosis device for a construction machine according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing stored contents of a storage unit included in the failure diagnosis device of FIG.

FIG. 3 is an explanatory view of the inside of the operator's cab of a construction machine equipped with the failure diagnosis device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Failure diagnosis device 2 Storage section 3 Control means 4 Connector 5 Display section 6 Portable failure diagnosis means 7, 8 Angle sensor 9 Display section 10 Monitor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ken Iijima 650 Jinrachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura factory (72) Inventor Hiroshi Watanabe 650 Kintate-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Ceremony Company Tsuchiura Factory (72) Hiroyuki Adachi Inventor Hiroyuki Adachi 650 Jinrachicho, Tsuchiura City, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura Factory (72) Inventor Masakazu Haga 650 Kintachicho, Tsuchiura City, Ibaraki Hitachi Construction Machinery Co., Ltd. Inside the Tsuchiura Plant (72) Inventor Kazuhiro Shibamori 650 Kandamachi, Tsuchiura City, Ibaraki Prefecture Hitachi Construction Machinery Co., Ltd.

Claims (2)

[Claims] 1. A failure diagnosis device for a construction machine, which performs a failure diagnosis of a plurality of parts mounted on a construction machine, comprising control means for detecting an abnormality based on an electric signal from the parts, and the control means is provided with: A failure diagnosis device for a construction machine, comprising a storage unit that stores error data of parts in a time-series order. 2. The portable failure diagnosing means according to claim 1, further comprising a portable failure diagnosing means removably connected to the control means via a connector, and the failure diagnosing means according to the order stored in the storage section. A failure diagnosis device for a construction machine, comprising a display section for displaying error data.