KR101881866B1 - Integrated monitoring apparatus and method of engine rotary state - Google Patents

Abstract

The present invention measures the temperature of a rotary part in a two-stroke engine, the bottom dead center (BDC) of a cylinder, splash oil and distance, and the humidity (WIO) in lubricating oil and measures a plurality of measured sensing data as one signal processing (SO) temperature of a rotary part in a two-stroke engine, a bearing temperature, a bearing wear value (a distance of a bearing), and the like. A signal processing integration unit for receiving a plurality of data measured by the measurement unit and integrating them into one signal processing; and a signal processing integration unit for performing integration processing of the plurality of data measured by the measurement unit, And a monitoring unit for continuously monitoring the status of the system.

Description

Technical Field [0001] The present invention relates to an integrated monitoring apparatus and method,

More particularly, the present invention relates to an apparatus and method for monitoring the condition of an engine rotation part, in particular, the temperature of a rotation part in a two-stroke engine, BDC of a cylinder, splash oil and a distance and humidity (WIO) And more particularly, to an apparatus and method for continuously monitoring the state of a rotating part in an engine by integrating and processing a plurality of sensed sensing data into one signal processing.

The two-stroke engine rotation unit is installed and operated independently for each device, which consists of a sensor, a signal processing unit, and a display unit. As each monitoring device is configured for each device, installation and commissioning costs and post management and maintenance costs are increasing.

In order to solve this problem, integration of monitoring devices is required. However, due to the characteristics of each manufacturer, input / output signals and power cable connections are different, and since product manufacturers can not install and commission products, Is very difficult to integrate.

There are three main types of bearings for two-stroke engine: main bearing, crosshead bearing and crank pin bearing. In case of crosshead and crank pin bearing, it is impossible to use wire temperature sensor because it has up and down and rotary motion. The conventional BTM (Bearing Temperature Monitor) has not been able to directly measure the temperature. Thus, as shown in FIG. 1A, indirectly measuring the bearing temperature by measuring the temperature of the lubricant around each bearing has been used.

However, recent advances in wireless communications technology have enabled wireless and non-power temperature measurements using wireless power transmission and Surface Acoustic Wave (SAW) technology. 1B shows an example of a radio type direct measurement method developed and applied in a developed country in a foreign country.

Although many products using the wireless power transmission have been developed, the size of the antenna to transmit electric power is limited. Bearing temperature sensor using SAW technology which is relatively small in size has not been developed by domestic manufacturers, and therefore, development of a wireless / non-powered bearing temperature sensor is required.

Japanese Patent Application Laid-Open No. 10-2013-0112540 (Oct. 14, 2013) Patent Registration No. 10-0985983 (September 30, 2010)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in an effort to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for measuring the temperature of a rotary part in a two-stroke engine, BDC of a cylinder, splash oil and a distance, And an object of the present invention is to provide an apparatus and method for continuously monitoring the state of a rotating part in an engine by integrating and processing a plurality of measured sensing data into one signal processing.

Other objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to another aspect of the present invention, there is provided a system for monitoring an integrated state of an engine rotating part, comprising: a controller for measuring a splash oil temperature, a bearing temperature, and a bearing wear value A signal processing integration unit for receiving a plurality of data measured by the measurement unit and integrating them into one signal processing, and a control unit for controlling the state of the in-engine rotation unit based on the integration result processed by the signal processing integration unit And a monitoring unit for monitoring the integrated system.

Preferably, the metering unit includes a bearing temperature sensor unit for sensing a bearing temperature, an SO temperature sensor unit for sensing a temperature of a splash oil (SO), and a temperature sensor unit integrated with the SO temperature sensor unit, (SO) temperature sensed by the SO temperature sensor unit in a configuration in which the SO temperature sensor unit and the distance sensor unit are integrated with each other, A first correcting unit for correcting a bearing wear value (distance) sensed by the distance sensor unit by changing a wear value (distance) according to a temperature range, and a second correcting unit correcting a bearing wear value (Distance) according to the RPM range stored in advance on the basis of the derived portion and the RPM (rotational speed) derived from the RPM derivation portion, and the corrected bearing wear value (distance) is corrected by the first correcting portion Bo Claim characterized in that the configuration includes a second correction.

Preferably, the first correction unit corrects the distance between the object and the sensor, which changes according to the temperature change based on the impedance change of the coil by the eddy current sensing technique.

Preferably, the second correction unit corrects the bearing wear value (distance) in consideration of the RPM (speed) that varies with the distance and time of the bearing according to the up and down and the rotational motion of the object.

Preferably, the SO temperature sensor unit transmits the rotational part bearing temperature to the signal processing integrated unit through a wireless / non-powered temperature sensor using SAW technology.

Preferably, the SO temperature sensor unit includes a piezoelectric substrate on which a wave is generated when an electric field is applied from outside, and a metal electrode on the piezoelectric substrate. When a sensor sense signal is transmitted from the antenna, an electrical signal is transmitted through the piezoelectric substrate and the electrode structure An interdigital transducer (IDT) for generating a surface acoustic wave as a mechanical signal; a delay line formed on the piezoelectric substrate for delaying a movement of surface acoustic waves generated by the IDT transmitted to the piezoelectric substrate by a predetermined time; And a reflector for converting a surface acoustic wave having been delayed and shifted by a number of strips and a surface acoustic wave whose reflection bandwidth is adjusted through a reflection force to A / D conversion, and outputting the surface acoustic wave as a temperature value through an antenna.

Preferably, the IDT has an electrode structure in which at least one of the electrode structure is spaced apart from the electrode pitch, the thickness of the electrode pitch, and the number of electrode pitches are different.

Preferably, the SO temperature sensor unit comprises a chip antenna or a coil antenna.

Preferably, the monitoring unit receives the integrated data transmitted from the signal processing integration unit 200 and displays at least one of the real time data, the trend, and the state of the entire system, and stores data and an event log at specific time intervals And the mounting state of the SO temperature sensor unit, the bearing temperature sensor unit, and the distance sensor unit of the measuring unit is provided in real time in accordance with the commissioning procedure.

In order to achieve the above object, according to the present invention, there is provided a method for monitoring an integrated state of an engine rotation part, comprising the steps of: (A) measuring a splash oil temperature, a bearing temperature, (B) a step of receiving the plurality of measured data through a signal processing integration unit using a SAW technology and integrating the processed data into one signal processing; (C) And integrating and monitoring the state of the rotating part in the engine on the basis of the integrated result.

Preferably, the step (A) comprises the steps of sensing a splash oil (SO) temperature, a bearing temperature and a bearing wear value (distance), and determining a splash oil temperature based on the sensed splash oil A first correction step of correcting a bearing wear value (distance) sensed by the distance sensor unit by changing a wear value (distance) according to a temperature range stored in advance; (Distances) according to the RPM range previously stored on the basis of the derived RPM (rotation speed), and corrects the bearing wear value (distance) corrected in the first correction step, And a correction step.

The step (C) may include displaying at least one of real-time data, trends, and a state of the entire system by receiving the integrated data to be transmitted, and storing and retrieving data and an event log at specific time intervals And providing the installation state of the SO temperature sensor unit, the bearing temperature sensor unit and the distance sensor unit of the measuring unit in real time according to the commissioning procedure.

As described above, according to the present invention, the integrated state monitoring apparatus for the engine rotation state integrates the splash oil temperature sensor and the bottom dead point sensor, which is an eddy current sensor, to compensate the temperature characteristic of the eddy current sensor In order to reduce the complexity and cost of the system by removing the temperature sensor, which has been installed in order to reduce the load on the measurement and diagnosis apparatus, the temperature correction performed by the existing measurement and diagnosis apparatus can be performed by the sensor.

1 is a schematic view for explaining a conventional method of measuring a bearing temperature
2 is a block diagram showing an engine rotation state monitoring apparatus according to an embodiment of the present invention.
Fig. 3 is a block diagram showing the configuration of the measuring unit in Fig. 2
FIG. 4 is a schematic view showing the configuration of the SO temperature sensor unit in FIG. 3
FIG. 5 is a diagram showing the configuration of the IDT in detail in FIG.
FIG. 6 is a diagram showing a distance and time variation of the crosshead bearing with respect to the rotational RPM (rotational speed) of the crankshaft,
FIG. 7 is a conceptual diagram illustrating a screen displayed through the monitoring unit in FIG.

Other objects, features and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is provided to let you know. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

2 is a block diagram illustrating an apparatus for monitoring an integrated state of an engine rotating part according to an embodiment of the present invention.

A metering section 100 for measuring the splash oil SO temperature, the bearing temperature, and the bearing wear value (distance) of the rotary section in the two-stroke engine as shown in Fig. 2; A signal processing integration unit 200 for receiving a plurality of measured data and integrating them into one signal processing and processing the state of the in-engine rotation unit based on integration results processed by the signal processing integration unit 200, And a monitoring unit 300 for monitoring the integrated system.

For reference, the bearing wear value is a variation amount of the bearing due to wear of the bearing, which is the sum of the wear of the crankpin bearing, the crosshead bearing, and the main bearing. This wear value causes the top dead center and bottom dead center of the piston to change. However, in the case of the top dead center, it is impossible to measure the position of the piston in the combustion chamber. The bottom dead center of the piston can be measured by measuring the lowest position of the guide shoe of the crosshead in the crankcase. Therefore, the distance sensor that senses the wear value of the bearing is installed in the crankcase to measure the lowest position of the guide shoe and measure the bottom dead center of the piston through it. The bottom dead center of the measured piston represents the wear value of the bearing.

3, the measuring unit 100 includes a bearing temperature sensor unit 160 for sensing a bearing temperature, an SO temperature sensor unit 110 for sensing a temperature of a splash oil SO, A distance sensor unit 120 which is integrated with the SO temperature sensor unit 110 and senses a wear amount of the bearing and a distance sensor unit 120 which is disposed between the SO temperature sensor unit 110 and the distance sensor unit 120, (Distance) according to the temperature range pre-stored based on the temperature of the splash oil SO sensed by the SO temperature sensor unit 110 in the integrated configuration, An RPM derivation unit 140 for deriving a rotation RPM (rotation speed) of the rotation unit in the two-stroke engine; a first correction unit 130 for correcting a bearing wear value (distance) sensed by the RPM derivation unit (Distance) based on the RPM range stored in advance based on the RPM Changes to the first consists of a first correcting the second correction unit 150, which unit 130 corrects the bearing wear value (distance) from the corrected.

At this time, the distance sensor unit 120 that senses the bearing wear value uses the eddy current sensing technique. The eddy current sensing technique is a technique for measuring the distance from the object to be measured by using the impedance change of the coil. At this time, since the impedance of the coil is dependent on the measurement target object and the ambient temperature, the distance value outputted by the distance sensor unit 120 varies depending on the temperature even if the measurement target object and the sensor are at the same distance. This distance error may be several times greater than the accuracy of the distance sensor depending on the ambient temperature.

Therefore, the abrasion value (distance) according to the temperature range in the first correcting unit 130 is corrected.

In the case of a crank pin or a crosshead bearing, the object of the temperature measurement is vertically and rotationally moved so that the time and distance that the wireless sensor can measure the temperature are limited. Accordingly, the bearing wear value (distance) according to the RPM range is corrected through the secondary correction of the second correction unit 150. [

Fig. 6 is a diagram showing the distance and time variation of the crosshead bearing with respect to the rotational RPM (rotation speed) of the crankshaft. The second correction of the bearing wear value (distance) is calculated by the following equation (1).

On the other hand, the SO temperature sensor portion of the crosshead bearing is installed near the TDC (Top Dead Cenetr). As can be seen from FIG. 6, the up / down movement speed of the crosshead bearing is relatively slow near the TDC. Therefore, the transmission / receivable speed of the crankpipe bearing having the same moving speed as the rotational speed of the crankshaft at the time of the secondary correction is used as a reference. However, according to one embodiment of the present invention, the calculation formula for the secondary correction should be appropriately changed depending on the object of the temperature measurement.

Two-stroke internal bearings are classified as main bearings, crosshead bearings, and crank pin bearings. Crosshead bearings and crank pin bearings move up and down and rotate, making cabling impossible. Therefore, the measurement unit 100 transmits the rotation unit bearing temperature to the signal processing integration unit 200 through the wireless / non-power temperature sensor utilizing the SAW technology.

4 is a block diagram showing the configuration of the SO temperature sensor unit in detail in FIG.

4, the SO temperature sensor unit 110 includes a piezoelectric substrate 111 for generating a wave when an electric field is applied from the outside, a metal electrode on the piezoelectric substrate 111, An IDT (Inter Digital Transducer) 112 for generating a surface acoustic wave, which is a mechanical signal, through an electrode structure with the piezoelectric substrate 111 when the sensor sensing signal is transmitted from the piezoelectric substrate 111 to the piezoelectric substrate 111 A delay line 113 for delaying the movement of the surface acoustic wave generated by the IDT, which is transmitted to the piezoelectric substrate 111, for a predetermined time, and a surface acoustic wave which is delayed and moved through the delay line 113, And a reflector 114 for A / D-converting the surface acoustic wave whose reflection bandwidth is adjusted through the antenna 115 and outputting it through the antenna 115 as a temperature value.

기판보다는 전기기계결합계수가 크고 SAW 전달특성이 뛰어난

기판을 사용하는 것이 바람직하다. At this time, as the temperature sensitivity of the RF substrate changes depending on the frequency band, the piezoelectric substrate 111 has a gain of 19 ppm /

Electromechanical coupling coefficient is larger than substrate and SAW transmission characteristic is superior

It is preferable to use a substrate.

5, since the IDT 112 is formed on the piezoelectric substrate 111 as well as the material thereof, the IDT 112 has a reflection power and a bandwidth different from each other. Therefore, The thickness of the electrode pitch, and the number of electrode pitches. 5 (a) is a diagram showing a frequency change according to an electrode structure shape, and FIG. 5 (b) is a diagram showing a filter effect according to an electrode pitch.

Accordingly, when the electric field is applied from the outside, the piezoelectric substrate 111 generates a wave, and when an IDT 112 is formed on the piezoelectric substrate 111 and a signal is applied, an electric signal of an appropriate frequency, A mechanical wave and a surface acoustic wave are generated and transmitted to the piezoelectric substrate 111 and then converted into an electromagnetic wave again by an inverse piezoelectric effect at the output electrode and only a specific resonance frequency signal can be selected. Equation 2 is as follows.

The surface acoustic wave generated by the IDT 112 passes through the delay line 113 and is returned through the reflection plate 114. At this time, the number of strips N of the reflection plate 114 and the reflection coefficient r R) is expressed by the following equation (3).

At this time, the reflection bandwidth is reduced according to the number of strips (N), and a suitable number should be designed considering the relationship between the two elements. The bandwidth (B) is determined by the following equation (4).

On the other hand, the SO temperature sensor unit 110 has a poor installation environment and a narrow space, thereby forming a chip antenna. However, since the chip antenna is limited to a transmitting / receiving distance of several centimeters, it may be constituted by a coil antenna to solve this problem.

The signal processing integration unit 200 is configured to receive a plurality of data measured by the measurement unit 100. The signal processing integration unit 200 uses a Modbus protocol that is a standardized protocol to measure and diagnose and output the measured data to the monitoring unit 300. [ The Modbus protocol is a master / slave structure, which is suitable for monitoring the status of various peripheral devices, and is easy to add new equipment.

Meanwhile, the signal processing integration unit 200 is configured as shown in Table 1 below to integrate all the signal processing devices into one.

By integrating the plurality of data measured by the measurement unit 100, it is possible to perform all of the functions of the individual monitoring devices in one measurement and diagnostic apparatus, thereby solving the load of the processor and the complexity of software development, .

As shown in FIG. 7, the monitoring unit 300 receives the integrated data transmitted from the signal processing integration unit 200 and displays real-time data and trends, the status of the entire system, and the like. And an event log (Event Log). In addition, the function of compressing stored data and the function of deleting old data can be added to utilize limited storage space effectively.

The monitoring unit 300 basically implements the display function of the integrated data transmitted from the signal processing integration unit 200 and controls the SO temperature sensor unit 110, the bearing temperature sensor unit 160, So that the installation state of the distance sensor unit 120 and the like can be confirmed in real time.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (12)

A metering section for measuring a splash oil SO temperature, a bearing temperature and a bearing wear value (distance) of a rotating part in a two-stroke engine,
A signal processing integration unit for receiving a plurality of data measured by the measurement unit and integrating them into one signal processing,
And a monitoring unit that continuously monitors the state of the internal combustion engine based on the integrated result processed by the signal processing integration unit,
The measuring unit
A bearing temperature sensor unit for sensing a bearing temperature,
An SO temperature sensor unit for sensing a splash oil (SO) temperature,
A distance sensor unit that is integrated with the SO temperature sensor unit and senses a bearing wear value (distance)
The SO temperature sensor unit and the distance sensor unit are integrated with each other to change the wear value (distance) according to a pre-stored temperature range based on the temperature of the splash oil (SO) sensed by the SO temperature sensor unit A first correcting unit for correcting a bearing wear value (distance) sensed by the distance sensor unit,
An RPM derivation unit for deriving a rotation RPM (rotation speed) of the rotation unit in the two-stroke engine,
(Distance) according to the RPM range stored in advance based on the RPM (rotation speed) derived from the RPM derivation unit and corrects the corrected bearing wear value (distance) in the first correcting unit, And a correction unit for correcting the state of the engine. delete The apparatus of claim 1, wherein the first correction unit
And the distance between the sensor and the sensor, which is changed according to the temperature change, is corrected based on the impedance change of the coil by the eddy current sensing technique. The apparatus of claim 1, wherein the second correction unit
Wherein the bearing wear amount (distance) is corrected in consideration of the RPM (speed) that varies with the distance and time of the bearing due to the up and down movement of the object and the rotational movement of the object. The method according to claim 1,
Wherein the SO temperature sensor unit transmits the rotation part bearing temperature to the signal processing integrated unit through a wireless / non-power temperature sensor using SAW technology. The apparatus according to claim 1, wherein the SO temperature sensor unit
A piezoelectric substrate for generating a wave when an electric field is applied from the outside,
An IDT (Inter Digital Transducer) which generates a surface acoustic wave, which is a mechanical signal, through an electrode structure and a piezoelectric substrate when a sensor signal is transmitted from the antenna,
A delay line formed on the piezoelectric substrate for delaying the movement of the surface acoustic wave generated by the IDT transmitted to the piezoelectric substrate by a predetermined time,
And a reflector for returning the surface acoustic waves, which are delayed and moved through the delay line, through the number of strips and the reflection force, and outputting the surface acoustic waves as temperature values through the antenna. Engine revolution status integrated monitoring device. The method according to claim 6,
Wherein the IDT has an electrode structure of a plurality of shapes in which at least one of a distance between electrode pitches, a thickness of an electrode pitch, and a number of electrode pitches is different. The method according to claim 6,
Wherein the SO temperature sensor unit comprises a chip antenna or a coil antenna. The method according to claim 1,
The monitoring unit receives the integrated data transmitted from the signal processing integration unit 200 and displays at least one of the real time data, the trend, and the state of the entire system. The monitoring unit stores data and an event log at specific time intervals, And the installation state of the SO temperature sensor unit, the bearing temperature sensor unit, and the distance sensor unit of the measuring unit is provided in real time in accordance with the commissioning procedure. (A) measuring the splash oil (SO) temperature, bearing temperature, and bearing wear value (distance) of the two-stroke engine internal rotation part through the metering part,
(B) inputting the plurality of measured data through a SAW technology and integrating the plurality of measured data into one signal processing through a signal processing integration unit,
(C) monitoring the state of the in-engine rotating part at all times based on the processed integration result through the monitoring part,
The step (A)
Sensing a splash oil (SO) temperature, a bearing temperature and a bearing wear value (distance)
A first correction step of correcting the bearing wear value (distance) by changing a wear value (distance) according to a pre-stored temperature range based on the sensed temperature of the splash oil (SO)
(Rotational speed) of the rotating part in the two-stroke engine is derived, and is changed to a wear value (distance) according to the RPM range stored in advance based on the derived RPM (rotational speed) And a second correction step of correcting again the bearing wear value (distance). delete 11. The method of claim 10, wherein step (C)
Displaying at least one of the real-time data, the trend, and the state of the entire system by receiving the integrated data to be transmitted,
Storing and retrieving data and event logs at specific time intervals,
And providing the installation state of the SO temperature sensor unit, the bearing temperature sensor unit and the distance sensor unit of the measuring unit in real time according to the commissioning procedure.

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