JP2002180972A - Method and system for diagnosing performance of hydraulic pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily grasp an optimal inspection timing of a hydraulic pump by displaying the soundness of the hydraulic pump by digitization. SOLUTION: This system for diagnosing the operating state of the hydraulic pump 1 is provided with a sensor part 3 detecting multiple types of data related to the performance of the hydraulic pump 1 during the operation, an arithmetic part 9 processing the present data along with the reference values of the various data and unifying them, and an output part 11 digitizing the present performance of the hydraulic pump 1 according to the processing result and displaying it to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and system for diagnosing the performance of a hydraulic pump.

[0002]

2. Description of the Related Art Hydraulic pumps installed in factories, automobiles, railway vehicles, etc., measure oil flow rate, oil temperature, oil pressure, etc. sequentially, and when individual data is out of a predetermined reference value. In addition, a process of issuing a warning signal that an abnormality has occurred in a hydraulic pump is widely performed.

[0003]

However, these methods only detect the abnormality of the hydraulic pump after the fact, and cannot predict the occurrence of these abnormalities in advance. In actual use conditions, inspections are performed periodically to prevent this type of abnormality.However, in the past, inspection times are often determined based on experience and feelings according to usage conditions and usage environment. For this reason, there is a case where the maintenance cost is increased by performing the inspection even though the inspection is not actually required, or the above-described abnormality occurs when the inspection time is missed even though the inspection is required.

[0004] In particular, in track maintenance vehicles for railway tracks,
The structure is generally simple because high-speed traveling is unnecessary, and in many cases, only the minimum necessary equipment is provided. Therefore, a simple abnormality detection function is desired.

Accordingly, an object of the present invention is to provide a performance diagnosis method and a diagnosis system capable of easily grasping an optimal inspection time of a hydraulic pump by numerically displaying a degree of soundness of the hydraulic pump and displaying it.

[0006]

In order to achieve the above object, according to the present invention, when diagnosing the operation state of a hydraulic pump, a plurality of types of data related to the performance of the hydraulic pump are detected during the operation. The present performance data of the hydraulic pump is numerically represented by performing arithmetic processing on the current performance data together with the reference values of various data to unify them.

As a result, the degree of soundness of the hydraulic pump can be expressed numerically, and it can be easily determined whether or not an inspection is required.

As a plurality of types of data, at least the oil flow rate, oil pressure, oil temperature, and room temperature in a hydraulic pump can be considered.

The above diagnostic method can be used, for example, for a railway track maintenance work vehicle.

A diagnostic system according to the present invention is a system for diagnosing the operating state of a hydraulic pump, and includes a sensor unit for detecting a plurality of types of data related to the performance of the hydraulic pump during operation thereof, The present invention includes an operation unit that performs an operation process on current data together with reference values of various data to unify the current data, and an output unit that externally displays the current performance of the hydraulic pump according to the operation result.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 conceptually shows the system of the present invention, and exemplifies a hydraulic pump mounted on a track maintenance work vehicle (for example, a track motor car) for a railway track. In the present invention, the oil temperature, the oil flow rate, the oil pressure, and the room temperature in the hydraulic pump 1 are each detected by the sensor unit 3. The detection data from each of the sensors 3a to 3d of the sensor unit 3 is
Is transmitted to the arithmetic unit 9 such as a personal computer via the PC. This data is integrated with a reference value (for example, a value in a normal operation state under the same condition) of various data (oil temperature, oil flow rate, oil pressure, room temperature) stored in advance, thereby unifying the hydraulic pump 1 Can be expressed numerically. The detection by the sensor unit 3 may be performed periodically for a fixed time (for example, only for 15 minutes), or may be performed constantly during operation.

The degree of soundness can be evaluated, for example, by the degree of change S in the current performance from the normal operation state. The degree of change S is obtained, for example, from the following equation.

S = a × A ′ / A + b × B ′ / B + c × C ′ / C where A ′, B ′, C ′,.
For example, the difference (A ') between the oil temperature and the room temperature, the oil flow rate (B'), and the oil pressure (C ') are respectively represented, and A, B, and C represent their reference values. Further, a, b, and c are correction coefficients, respectively, and can be arbitrarily selected according to their respective degrees of importance.
As the measurement data A ', B', C ', an average value per unit time may be used, or a maximum value or a minimum value may be used. Of course, the arithmetic expressions are not limited to those described above, and various arithmetic expressions can be used.

The calculated change degree S is output to the outside by an output unit 11 such as a monitor or a printer. If this S is out of the preset range, the soundness of the hydraulic pump is degraded, and it is considered that any part of the hydraulic pump is defective (or will occur in the future). It can be determined that the vehicle is approaching, and it is possible to numerically grasp the current soundness of the hydraulic pump.

In the above example, data is to be detected as
Although only the oil temperature, oil flow rate, oil pressure, and room temperature are illustrated, other data related to the hydraulic pump performance, such as the voltage and current values of a power supply circuit and the like provided in the hydraulic pump, are detected, and these are calculated. The degree of change S can be calculated in addition to the parameters of the equation. Data exchange between devices (between the sensor unit 3 and the converter 7, between the converter 7 and the arithmetic unit 9, between the arithmetic unit 9 and the output unit 11) uses a communication line, Wireless can also be used.
Further, the system of the present invention includes the entirety including the output unit 11 near the hydraulic pump, and also includes the sensor units 3a to 3a.
While only d and its output terminal are provided in the vicinity of the hydraulic pump, the repeater 7, the operation unit 9, and the display unit 11 are made portable and a diagnostic unit is connected to each output terminal for each diagnosis. Good.

As described above, in the track maintenance work vehicle, the hydraulic pump 1 is generally rarely provided with an abnormality detection function. However, the performance of the hydraulic pump can be diagnosed at an early stage by adding the diagnostic system. It is possible to further facilitate track maintenance work and reduce costs.

[0018]

As described above, according to the present invention, the degree of soundness of the hydraulic pump can be expressed numerically, so that anyone can easily grasp the degree of performance deterioration of the hydraulic pump without special skill. The inspection time can be easily determined.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating the concept of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic pump 3 Sensor part 3a-3d sensor 7 Repeater 9 Operation part 11 Output part

Claims (4)

[Claims] When diagnosing the operation state of a hydraulic pump, a plurality of types of data related to the performance of the hydraulic pump are detected during the operation thereof, and the current data is processed together with reference values of various data to be unified. The present invention provides a method for diagnosing the performance of a hydraulic pump, wherein the current performance of the hydraulic pump is represented numerically. 2. The hydraulic pump performance diagnosis method according to claim 1, wherein an oil flow rate, a hydraulic pressure, an oil temperature, and a room temperature of the hydraulic pump are detected as the plurality of types of data. 3. The method for diagnosing the performance of a hydraulic pump according to claim 1, wherein the method is used for a railway track maintenance work vehicle. 4. A system for diagnosing an operation state of a hydraulic pump, comprising: a sensor unit for detecting a plurality of types of data related to the performance of the hydraulic pump during the operation thereof; A hydraulic pump performance diagnosis device, comprising: an arithmetic unit that performs arithmetic processing together with a reference value to unify it; and an output unit that externally displays the current performance of the hydraulic pump according to the arithmetic result.