JP3310852B2 - Fault diagnosis equipment for construction machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure diagnosis apparatus for a construction machine that diagnoses failures of a plurality of components such as an electronic component and a hydraulic component mounted on a construction machine such as a hydraulic shovel.

[0002]

2. Description of the Related Art Conventionally, control means for detecting an abnormality of a component based on electric signals from a plurality of components such as electronic components and hydraulic components mounted on a construction machine, and a connector connected to the control means via a connector. 2. Description of the Related Art There has been known a failure diagnosis apparatus for a construction machine, which is configured by detachable portable failure diagnosis means. In the known failure diagnosis device, when an abnormality occurs in an arbitrary electronic component, for example, an electric system of a boom angle sensor for detecting a boom angle, error data is stored in a control unit in accordance with a predetermined priority. When a maintenance person in charge of the 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 of the failure diagnosis means. Therefore, if the sensor power supply is short-circuited due to the disconnection abnormality of the boom angle sensor and the abnormality of the other angle sensor is detected, when the failure diagnosis means is connected to the control means, the power supply for the sensor, the boom Each error data of a sensor, another sensor or the like is displayed based on the priority determined by the control means.

[0003] As a prior art related to this type of failure diagnosis apparatus, there are, for example, those described in Japanese Patent Publication Nos. 7-18780 and 7-23718.

[0004]

By the way, in the above-described conventional construction machine failure diagnosis apparatus, when an abnormality occurs in a plurality of parts, these error data are displayed based on the priority determined by the control means. Therefore, there is a problem that the maintenance staff cannot specify which part of the abnormality 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 sensors, etc. is displayed, it is necessary to check these sensor power supply, boom sensor, other sensors, etc., respectively, which is troublesome and time consuming. There was a problem that it takes.

[0005] The present invention has been made in view of such a situation of the prior art, and an object of the present invention is to provide a method in which, when an abnormality occurs in a plurality of components mounted on a construction machine, error data of these components is detected. An object of the present invention is to provide a failure diagnosis device for a construction machine that can be displayed in the order of detection and can easily estimate the root cause of the abnormality.

[0006]

Means for Solving the Problems The present invention, time when an abnormality in a plurality of parts occurs, is stored in accordance with time-series order of the error code for these components, these error codes if necessary It will be displayed in series. In this way, for example, after the boom angle sensor has a disconnection abnormality and the sensor power supply is short-circuited, if another angle sensor has an abnormality, the abnormality of these boom angle sensors, the short-circuit of the sensor power supply and other each error U-angle sensor
Stored in the generated order over de abnormality, by reading and displaying the error code that is the storage, initially a part boom angle sensor occurred abnormality, then the short and the other of an angle sensor of the power sensor The occurrence of an abnormality is instantaneously confirmed, the history of a series of occurrences of the abnormality can be systematically grasped, and the root cause of the abnormality can be easily estimated.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fault diagnosis apparatus for a construction machine according to the present invention includes 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 error codes in chronological order.

The error code stored in the storage unit is
A time-series display may be performed on a monitor or the like installed in the cab of the construction machine, but a time-series display is performed on the display unit of the portable failure diagnosis unit detachably connected to the control unit via a connector. Then, it is convenient for a maintenance person in charge of maintenance of the construction machine.

[0009]

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

As shown in FIG. 1, a failure diagnosis apparatus 1 according to the present embodiment comprises a control means 3 having a storage unit 2 and a portable failure which is detachably connected to the control means 3 via a connector 4. The portable fault diagnosis unit 6 includes a display unit 5. A plurality of components such as a boom angle sensor 7, an arm angle sensor 8, and other electronic components and hydraulic components (not shown) are electrically connected to the control unit 3, and the control unit 3 detects abnormality of these components. In addition, a monitor 10 having another display unit 9 is also electrically connected. Components such as the control means 3, the connector 4, the sensors 7, 8 and the monitor 10 except for the failure diagnosis means 6 and the monitor 10 are provided in the construction machine.
In the cab of the excavator shown in FIG.
A monitor 10 is installed in front of the monitor 10.
The display unit 9 displays data such as the distance from the turning center of the excavator to the bucket and the height of the bucket. On the other hand, the failure diagnosis means 6 is normally disconnected from the connector 4 and is 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 the addresses A1 to An in the storage unit 2 in the order of occurrence of abnormalities in the components such as the angle sensors 7 and 8 in order. Thus, the storage unit 2 stores a plurality of error codes in chronological order. For example, the error code of the first occurrence of abnormality is stored at the first address A1, the error code of the second occurrence of abnormality is stored at the second address A2, and similarly, the error code of the nth occurrence is stored. The abnormal error code is stored at the n-th address An.

In this embodiment, for example, if a disconnection abnormality of the boom angle sensor 7 occurs and then an abnormality of the arm angle sensor 8 occurs, the control means 3 detects these abnormalities and stores them first. The error code “40” of the boom angle sensor 7 is stored in the first storage address A1 of the unit 2 and the error code “7” of the arm angle sensor 8 is stored in the second storage address A2.
"0" is stored. When the maintenance person 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 is read out, and the display unit 5
Error code "40" of address A1, address A2
Are displayed in chronological order in the order of occurrence of abnormalities such as error code "70".

In the embodiment configured as described above, when an abnormality occurs in a plurality of components such as the angle sensors 7 and 8, error codes are displayed on the display unit 5 of the failure diagnosis means 6 in the order in which the abnormality occurred. Maintenance personnel in charge of maintenance of construction machines can systematically grasp the history of occurrence of a series of abnormalities, and can easily estimate the root cause of the abnormalities and greatly reduce 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 person.
0 can be displayed in time series on the display unit 9. In this case,
Since the failure diagnosis means 6 is not always necessary, it may be omitted.

[0015]

As described above, according to the present invention,
When an error occurs in multiple parts mounted on construction equipment, the history of a series of errors can be systematically grasped based on the error codes displayed in the order in which the errors occurred. The root cause is easily estimated,
Repair of a failed part can be performed quickly.

Further, when to display the error code portable failure diagnosing means and connector connection can be maintenance personnel carrying the failure diagnosis means in performing repair of the parts and take advantage of the error code .

[Brief description of the drawings]

FIG. 1 is a block diagram of a construction machine failure diagnosis apparatus according to one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing storage contents of a storage unit provided in the failure diagnosis device of FIG. 1;

FIG. 3 is an explanatory diagram of a cab of a construction machine including the failure diagnosis device of FIG. 1 as viewed from the front.

[Explanation of symbols]

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

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takeshi Ken Iijima 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Inside the Tsuchiura Plant (72) Inventor Hiroyuki Adachi 650, Kandamachi, Tsuchiura City, Ibaraki Prefecture Inside the Tsuchiura Plant, Hitachi Construction Machinery Co., Ltd. 72) Inventor Kazuhiro Shibamori 650 Kandate-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura Plant (56) Reference JP-A-7-87005 (JP, A) JP-A-6-330539 (JP, A) JP-A-6-62603 (JP, A) JP-A-7-119183 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02F 9/26 G01M 19/00

Claims (2)

(57) [Claims] An apparatus for diagnosing failure of a plurality of components mounted on a construction machine, comprising: control means for detecting an abnormality based on an electric signal from the part; A failure diagnosis device for a construction machine, comprising: a storage unit for storing error codes of parts in chronological order. 2. The portable electronic device according to claim 1, further comprising a portable failure diagnosis unit detachably connected to said control unit via a connector, wherein said failure diagnosis unit stores said failure in accordance with an order stored in said storage unit. A failure diagnosis device for a construction machine, comprising a display unit for displaying an error code .