JPH0731358Y2 - Automatic abnormality check monitor for hydraulic circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to an automatic abnormality check monitor of a hydraulic circuit of a construction machine.

(Prior Art) A conventional construction machine has a monitor that simply displays the oil amount and the hydraulic pressure, but an automatic abnormality check monitor of a hydraulic circuit corresponding to the present invention is not known. Conventionally, people only troubleshoot. This will be described with reference to FIG.

As shown in (I) of the figure, when an abnormal phenomenon 1 occurs in the hydraulic actuator, the operator first recognizes this abnormality 2 by sensory evaluation, then measures 3 with a measuring instrument such as a measure or a stopwatch, and outputs the measured value. Comparison 4 with the judgment reference value, return 9 if there is no abnormality, and if it is judged to be abnormal, this is the cause of this abnormal phenomenon. 5 is specified, repair, inspection,
If cleaning or replacement 6 is performed, operation check 7 is performed again, and if the operation returns to normal, then recovery 9 is performed.

Specific 5 will be described based on (II) and (III) of FIG. As illustrated in (III) of the figure, for example, in the case of a hydraulic excavator, a bucket hydraulic cylinder, an arm hydraulic cylinder,
A large number of hydraulic actuators such as a boom hydraulic cylinder, a left traveling hydraulic motor, a right traveling hydraulic motor, and a turning hydraulic motor are provided, and each hydraulic actuator has various abnormal phenomena. Further, regarding the abnormal cause device of each abnormal phenomenon, the hydraulic actuator is originally used as all devices of the hydraulic circuit, for example, the control device of the hydraulic circuit such as the rod linkage, the pneumatic circuit and the electric circuit, and the engine as the drive source. There is a wide variety.

However, each abnormality-causing device often spans a plurality of abnormality-causing device groups. The matrix of (II) in this figure is an example of this, and the abnormal cause devices a to g include the abnormal cause device group of the abnormal phenomenon A1 of the hydraulic actuator A and the abnormal cause device A2 of the hydraulic actuator A. There is an abnormal phenomenon of the hydraulic actuator B, which is over the group of devices causing the abnormality of the hydraulic actuator B1.

Therefore, a specific example of the above specification 5 will be described with reference to the matrix of FIG. For example, if an abnormal phenomenon A1 occurs in the hydraulic actuator A, it is estimated that the abnormal cause devices are four abnormal cause device groups a, c, e, and f. Actuator B
The devices a, c, and f that are also involved in the abnormal phenomenon B1 of
Since neither A2 nor B1 has occurred, the device cannot be the cause device of the abnormal phenomenon A1 and can therefore be deleted from the abnormal cause device group of the abnormal phenomenon A1. Therefore, only the device e becomes the device that causes the abnormal phenomenon A1, and if this is repaired, the actuator A
Will be able to operate normally.

(Problems to be solved by the device) However, the above-mentioned trouble shooting by the human is
In addition to requiring specialized skills, measuring instruments such as measure and stopwatch that cause variations in measured values are used, so depending on the person, the abnormal phenomenon cannot be detected, but the discovery of the abnormal cause device is delayed, or a completely incorrect judgment is made. There is a problem such as defeating.

(Means for Solving the Problems) In order to solve the above problems, the automatic abnormality check monitor of the hydraulic circuit according to the present invention is designed to detect pump discharge amount detecting means for detecting the discharge amount of a hydraulic pump, and to start operation of each hydraulic actuator. Hydraulic actuator operation detection means for detecting until the end, actual operation amount detection means for detecting the actual operation amount of each hydraulic actuator, and one or more abnormal cause devices that cause an abnormality for each abnormal phenomenon of each hydraulic actuator. Storage means for pre-storing a group of abnormal cause devices, reference operation amount calculation means for calculating the reference operation speed 1n and reference operation acceleration 1n of each hydraulic actuator by receiving the pump discharge amount from the pump discharge amount detection means, the hydraulic actuator The hydraulic actuator being operated is received from the operation detecting means, and each oil is received from the actual operation amount detecting means. Taking the actual operation amount of the actuator,
An actual actuation amount calculation means for calculating the actual actuation speed 2n and the actual actuation acceleration 2n of the hydraulic actuator in operation, receiving the reference actuation speed 1n and the reference actuation acceleration 1n of each hydraulic actuator from the reference actuation amount calculation means, and The actual operating speed 2n and the actual operating acceleration 2n are received from the actual operating amount calculation means, and these are compared.
When either one or both of 1n> 2n and 1n <2n, it is judged as an abnormal comparison judgment means, and each abnormal cause device group is exchanged with the storage means, and the comparison judgment means makes an abnormality. The abnormal cause that causes the abnormal phenomenon of the hydraulic actuator that is determined to be is deleted from each abnormal cause device of the device group, the device that also belongs to each other normal abnormal cause device group, and only the remaining device is the abnormal cause device. An abnormality-causing device extracting means for outputting to the display means, a displaying means for receiving the abnormality-causing devices from the abnormality-causing device extracting means, and visually displaying these are characterized by the above.

(Operation) According to the above configuration, the operation amount of each hydraulic actuator being operated is detected, the operation amount is compared with the reference operation amount, and if there is an abnormality, the abnormality-causing device is displayed on the display unit to notify the operator. Notify the device that caused the abnormality.

(Embodiment) A first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

(1) Description of Overall Configuration The main configuration of this embodiment will be described with reference to FIGS. 2 (I) and (II).

(A) Pump discharge amount detection means for detecting the discharge amount of the hydraulic pump at each time, (b) Actual operation amount detection means for detecting the operation amount of the hydraulic actuator at each time, (c) At the reference discharge amount of the hydraulic pump Means for storing the standard operating speed n and the standard operating acceleration n of the hydraulic actuator, (d) When the discharge amount of the hydraulic pump is detected, the standard operating speed n and the standard operating acceleration n of the hydraulic actuator are automatically and momentarily calculated. , A reference operation amount calculation means for converting into a reference operation speed 1n and a reference operation acceleration 1n of the hydraulic actuator in the discharge amount of the hydraulic pump (e) automatically when the discharge amount of the hydraulic pump and the operation amount of the hydraulic actuator are detected The actual operating speed 2n and actual operating acceleration 2n of the hydraulic actuator during operation
(F) The reference operation speed 1n of the hydraulic actuator and the actual operation speed 2n of the hydraulic actuator, and the reference operation acceleration 1n and the actual operation acceleration 2n are compared and calculated to obtain an abnormal value ( 1n> 2n, 1n <2n) output comparing / determining means, (g) Abnormal phenomenon of hydraulic actuator and storage means for storing the hydraulic circuit and equipment in the control circuit causing the abnormality, and (h) hydraulic actuator An abnormal cause device extraction unit that outputs the abnormal cause device by logical operation of the abnormal phenomenon and the abnormal cause device, and (i) a display unit that displays the abnormal cause device. And a so-called microcomputer and display means.

(2) Detailed description of configuration and explanation of logical operation for comparison and display by microcomputer Example machine is a general hydraulic excavator and variable displacement hydraulic pump as shown in FIG. 2 (I). (Not shown), hydraulic cylinder for bucket 21, hydraulic cylinder for arm 22, hydraulic cylinder for boom 23, hydraulic motor for turning 31, hydraulic motor for left traveling 32, hydraulic motor for right traveling 33, and their operating levers (see FIG. The following sensor is attached to (not shown).

Sensor 11 for detecting the rotational speed of the hydraulic pump, Sensor 12 for detecting the inclination of the hydraulic pump, Potentiometers 21S, 2 for detecting the expansion and contraction amount of the piston rod of each hydraulic cylinder (for bucket, arm, boom)
2S, 23S (the number of codes corresponds to the code of each hydraulic cylinder), rotary encoders 31S, 32S, 33S (the number of codes are each for detecting the rotation amount of each hydraulic motor (for right running, left running, turning)) (Corresponding to the sign of the hydraulic motor), each hydraulic cylinder 21, 22, 23 and each hydraulic motor 31, 32, 33
Hydraulic cylinders 21, 22, 23 to detect the operating time of
Then, set the hydraulic motor 3 on the extension side and the contraction side of each operating lever.
If 1, 32, 33, 1 sensor (12 in total) 21T1, 21T2, 22 provided on the forward and reverse rotation sides of each control lever
T1, 22T2, 23T1, 23T2, 31T1, 31T2, 32T1, 32T2, 33T
1, 33T2 (the first two digits of the code correspond to the code of each hydraulic actuator). Referring to FIG. 1, the ever-changing signals from the sensors are the A / D converter 40 and the input section 50. When the microcomputer 60 determines from these signals that there is an abnormality in each hydraulic actuator, the cause device is determined by the display unit 90 via the output unit 70 and the D / A converter 80.
Is displayed.

The microcomputer 60 is composed of a CPU, RAM and ROM. These will be divided into four and described in detail below with reference to FIG.

(A) CPU 610, ROM 611, and RAM 612 section ROM 611 stores in advance the reference operating speed n and the reference operating acceleration n of each hydraulic actuator 21, 22, 23, 31, 32, 33 for each discharge amount of the hydraulic pump. (Note that the letter n indicates the code of the hydraulic actuator 21, 22, 23, 31, 32, 33,
same as below).

The CPU 610 receives the rotation speed of the hydraulic pump from the sensor 11 and the inclination of the hydraulic pump from the sensor 12 to calculate the discharge amount of the hydraulic pump, and then the hydraulic actuators 21, 22 at this pump discharge amount, Standard operating speed of 23, 31, 32, 33 1n
Also, the standard operation acceleration 1n is converted from the ROM 611 and output to the CPU 630.

That is, this part corresponds to the pump discharge amount detecting means and the reference operation amount calculating means.

(B) CPU 620, ROM 621, RAM 622 section CPU 620 is a sensor 21S, 22S, 23S from each hydraulic cylinder 2
The amount of expansion / contraction of 1, 22, 23, the amount of rotation of each hydraulic motor 31, 32, 33 from the sensors 31S, 32S, 33S, and the sensors 21T1, 21T2, 22T
1, 22T2, 23T1, 23T2, 31T1, 31T2, 32T1, 32T2, 33T
1, 33T2 to each hydraulic actuator 21, 22, 23, 31, 3
In response to signals from the start to end of operations 2 and 33, the actual operating speed 2n and the actual operating acceleration 2n for each hydraulic actuator n in operation are calculated and output to the CPU 630.

That is, this part corresponds to an actual operation amount calculation means.

(C) CPU630, ROM631, and RAM632 parts The CPU630 compares the reference operating speed 1n from the CPU610 with the actual operating speed 2n from the CPU620, and the reference operating acceleration 1n from the CPU610 and the actual operating acceleration2n from the CPU620.
If there is a hydraulic actuator n corresponding to either or both of 1n> 2n and 1n <2n for each of the operating hydraulic actuators, the abnormal phenomenon is output to the CPU 640 together with the hydraulic actuator n. .

Abnormal phenomenon 1n> 2n indicates that the operation of the hydraulic actuator n is slower than the reference speed or stopped.

On the other hand, the abnormal phenomenon 1n <2n indicates that the hydraulic actuator n has popped out. Any abnormal phenomenon indicates a problem with related equipment.

That is, this part corresponds to the comparison and determination means.

(D) CPU 640, ROM 641, and RAM 642 section ROM 641 stores, for example, a matrix as shown in FIG. 2 (III). The matrix of FIG. 3 (III) is the same as the matrix of FIG. 3 (II) described in the section of the prior art, and thus the duplicated description will be omitted.

When the CPU 640 receives, for example, an abnormal hydraulic actuator A and its abnormal phenomenon A1 (for example, 1n> 2) from the CPU 630, as described in the section of the related art, the abnormal cause device groups a, c, e, Only the device e is extracted from f by the elimination method.

The matrix of FIG. 2 (IV) is a matrix obtained by modifying the matrix of FIG. 2 (III) by the erasing method. This elimination method is also
It is stored in ROM641.

As can be seen from FIG. 2 (IV), the CPU 640 determines that the CPU 630 detects, for example, an abnormal hydraulic actuator A and its abnormal phenomenon A1.
(Eg 1n> 2n) and abnormal phenomenon A2 (eg 1n <
2n), only the devices d, e, and f are extracted by the elimination method from each abnormal cause device group.

In other words, this erasing method erases devices that belong to other normal abnormal cause device groups from each abnormal cause device of the abnormal cause device group that causes the abnormal phenomenon of the hydraulic actuator determined to be abnormal by the CPU 630. This is a method, and the CPU 640 causes the display device 90 to display a device that has not been erased by this erasing method as a device causing an abnormality.

Incidentally, FIG. 2 (V) is an example in which when the CPU 640 causes the abnormal phenomenon A1 in the hydraulic actuator A, only the abnormal cause device e is displayed on the display 90.

In addition, in FIG. 2 (VI), the CPU 640 shows that the hydraulic actuator A
This is an example in which when the abnormal phenomenon A1 and the abnormal phenomenon A2 occur, the abnormal cause devices d, e, and f are displayed on the display device 90.

That is, the ROM 641 corresponds to a storage unit, the CPU 640 and the RAM 642 correspond to an abnormality cause device extraction unit, and the display 90 corresponds to a display unit.

The second embodiment is an example of a fixed displacement hydraulic pump. Although it is the same as that of the first embodiment of the variable displacement hydraulic pump as a whole, since the hydraulic pump is a fixed displacement type, the pump discharge amount is determined only by the rotational speed of the hydraulic pump. Therefore, the two sensors 11 and 12 in the first embodiment may be one sensor that detects engine rotation, for example. This is also the first
Results similar to those of the example are obtained.

(Effects of the Invention) As will be understood from the description of the above-described embodiments, the present invention has the configuration described in the above-mentioned claims, if necessary, and can be used to mechanically handle complicated trouble shooting in a hydraulic circuit performed by a person. It is a thing to change your shoulder. Further, as is clear from the description of the above embodiment, the following effects are obtained.

(1) The device that causes the abnormality can be found quickly and accurately.

(2) A small abnormal phenomenon can be found and the expansion of the abnormality can be prevented.

(3) Trouble shooting skills are not required.

(4) When the device causing the abnormality is displayed in a complicated manner on the display means,
The operator only operates another hydraulic actuator, and if a normal device is included in the displayed devices, the normal device can be deleted to reduce the number of displays.

For example, in a hydraulic circuit of a construction machine equipped with 8 hydraulic actuators, while using 5 hydraulic actuators,
According to the present invention, it is assumed that one of the hydraulic actuators is judged to be abnormal, and the display means displays, for example, five abnormal cause devices. At this time, instead of immediately stopping the use and disassembling and investigating these five abnormality-causing devices, the operator operates the operating lever to sequentially operate the three unused hydraulic actuators. By doing so, if there are three normal devices in the five abnormal cause devices, the three normal devices can be sequentially erased by the present invention. The required time is only the operation time of the operation lever by the operator and is several minutes.

[Brief description of drawings]

FIG. 1 is a main block diagram of a microcomputer according to the present invention. FIG. 2 is an embodiment diagram, (I) is a diagram of a hydraulic excavator equipped with the embodiment, (II) is a block diagram of a microcomputer of the embodiment, and (III) is an abnormal phenomenon and an abnormal cause device. Matrix, (IV) erasing matrix of abnormal cause device, (V) diagram of display means at abnormal phenomenon A1, (VI) abnormal phenomenon A1, A2
It is a figure of the display means at the time. FIG. 3 is a flow chart of conventional troubleshooting, (I) is a flow chart, (II) is a matrix of abnormal phenomena and abnormal cause devices,
(III) is a specific example diagram of an abnormal phenomenon and an abnormal cause device. 11 …… hydraulic pump rotation detection sensor 12 …… hydraulic pump inclination detection sensor 21S, 22S, 23S …… hydraulic cylinder expansion / contraction detection sensor 31S, 32S, 33S …… hydraulic motor rotation detection sensor 21T1, 21T2 …… bucket cylinder Operation operation detection sensor 22T1, 22T2 …… Arm cylinder operation operation detection sensor 23T1, 23T2 …… Boom cylinder operation operation detection sensor 31T1, 31T2 …… Left travel motor operation operation detection sensor 32T1, 32T2 …… Right travel operation operation detection Sensor 33T1, 33T2 …… Swing motor operation detection sensor 60 …… Microcomputer 90 …… Display 1n …… Standard operation speed 1n …… Reference operation acceleration 2n …… Actual operation speed 2n …… Actual operation acceleration

Claims (1)

[Scope of utility model registration request] 1. A pump discharge amount detecting means for detecting the discharge amount of a hydraulic pump, a hydraulic actuator operation detecting means for detecting the start to end of the operation of each hydraulic actuator, and an actual operation for detecting an actual operation amount of each hydraulic actuator. Amount detection means, storage means for pre-storing an abnormal cause device group consisting of one or a plurality of abnormal cause devices that cause an abnormality for each abnormal phenomenon of each hydraulic actuator, pump discharge amount from the pump discharge amount detection means A reference actuation amount calculation means for receiving the reference actuation speed 1n and the reference actuation acceleration 1n of each hydraulic actuator, receiving the hydraulic actuator being operated from the hydraulic actuator operation detection means, and receiving each hydraulic actuator from the actual actuation amount detection means. The actual working amount of
An actual actuation amount calculation means for calculating the actual actuation speed 2n and the actual actuation acceleration 2n of the hydraulic actuator in operation, receiving the reference actuation speed 1n and the reference actuation acceleration 1n of each hydraulic actuator from the reference actuation amount calculation means, and The actual operating speed 2n and the actual operating acceleration 2n are received from the actual operating amount calculation means, and these are compared.
When either one or both of 1n> 2n and 1n <2n, it is judged as an abnormal comparison judgment means, and each abnormal cause device group is exchanged with the storage means, and the comparison judgment means makes an abnormality. The abnormal cause that causes the abnormal phenomenon of the hydraulic actuator that is determined to be is deleted from each abnormal cause device of the device group, the device that also belongs to each other normal abnormal cause device group, and only the remaining device is the abnormal cause device. An abnormal cause device extraction means for outputting to the display means, a display means for receiving an abnormal cause device from the abnormal cause device extraction means, and visually displaying these, an automatic abnormality check monitor for a hydraulic circuit comprising: .