KR101701448B1 - Multichannel Nitrogen gas pressure monitoring system for Intake and exhaust valve actuation device of very large engine - Google Patents

Abstract

The present invention relates to a system for monitoring a pressure of nitrogen gas in a multi-channel accumulator of an intake and exhaust valve system for an extra-large engine so as to overall integrate pressure of the nitrogen gas in an accumulator of an intake and exhaust valve operating system included in each cylinder in an extra-large engine, such that an administrator easily recognizes the pressure thereof. The system according to the present invention comprises: a local system (100) being constructed for each intake and exhaust valve operating system so as to acquire a peak value for each period of the pressure of the nitrogen gas inserted to the accumulator; and a centered monitoring device 200 displaying, to a split screen, a determination result of whether the pressure of the nitrogen gas is appropriate for the peak value, acquired by the local system (100), for each period of the pressure of nitrogen gas for each accumulator.

Description

Technical Field [0001] The present invention relates to a multichannel accumulator nitrogen gas pressure monitoring system for a super large-capacity engine exhaust valve device,

The present invention relates to a multi-channel accumulator nitrogen gas pressure sensor for an ultra-large-capacity engine intake and exhaust valve device that allows a manager to easily recognize the nitrogen gas pressure as a whole by integrating the nitrogen gas pressure with respect to the accumulator of the intake and exhaust valve- Monitoring system.

Large ships use very large engines of several thousand to several hundred thousand horsepower.

Such a super-large-sized engine has a large number of cylinders as well as a large output. Here, each of the cylinders is configured to perform a suction-compression-explosion-exhaust stroke in accordance with the operation of the intake and exhaust valves (intake valve and exhaust valve) to reciprocate the piston, convert the piston motion into rotary motion, do.

At this time, the operation cycle of the intake and exhaust valves consists of a series of operations that start intake immediately before ending the exhaust, close the valve until the compression and explosion time of the piston after completion of the intake, and open the exhaust valve after the explosion.

Generally, the super large marine engine is made to rotate at about 240 rpm, so that the intake and exhaust valves are interrupted by hydraulic cylinders at a cycle of about 4 Hz.

The hydraulic device including the hydraulic cylinder is operated by the oil supplied from the hydraulic pump connected through the hydraulic pipeline. At this time, in order to reduce energy, downsize the hydraulic pump, reduce the pulsation of the hydraulic pressure in the hydraulic pressure line, Install an accumulator on the hydraulic pipeline.

The accumulator divides the oil inflow / outflow space communicated with the hydraulic pressure line and the nitrogen gas injection space injecting the nitrogen at a predetermined atmospheric pressure into diaphragms to allow the oil to flow in or out due to the variation of the oil pressure in the hydraulic pressure line.

However, since the injected nitrogen gas leaks due to various factors, it is necessary to recharge the nitrogen gas at an appropriate time.

Open No. 10-2014-0023087 discloses a technique for indicating a pressure of nitrogen gas by installing a pressure gauge in an accumulator as a technique for this purpose.

However, during the operation of the engine, the nitrogen gas pressure fluctuates in a very short period according to the stroke cycle of the engine. Therefore, even if the pressure gauge is installed in the accumulator as in the patent publication No. 10-2014-0023087, .

Furthermore, the accumulator operated by high pressure hydraulic operation operates at approximately 14,400 cycles when the engine is operated for one hour. In the case of a long-distance ship, it is necessary to operate tens of millions to hundreds of millions of cycles in order to complete the round trip. Even if the pressure of the nitrogen gas is checked immediately before the operation and recharged when necessary, the operation of the intake and exhaust valves may be poor or the performance of the engine may be deteriorated due to the pressure drop caused by the leakage of the nitrogen gas during the operation of the ship for a long time.

On the other hand, a hydraulic device installed for operating the intake and exhaust valves for each cylinder of the engine generally requires two accumulators, and in the case of a very large engine used for a large ship, the number of cylinders is very large, As well. For example, if the number of cylinders is 24, the number of accumulators is 48.

Since it is very difficult to monitor the nitrogen gas pressure of many accumulators, there is a demand for a system capable of easily recognizing the accumulator with a reduced nitrogen gas pressure among many accumulators.

KR 10-2014-0023087 A 2016.02.26.

Therefore, it is an object of the present invention to provide a large-sized engine capable of accurately judging whether or not the nitrogen gas pressure injected into the accumulator is suitable even during operation of the engine, A multi-channel accumulator nitrogen gas pressure monitoring system for an intake and exhaust valve device.

In order to accomplish the above object, the present invention provides a multi-channel accumulator nitrogen gas pressure monitoring system for a super large-capacity engine exhaust valve device for integrally monitoring the nitrogen gas pressure of an accumulator (10) provided for each of a plurality of intake / (100) for detecting a periodic peak of a nitrogen gas pressure, which is represented by a periodic waveform in accordance with an engine stroke cycle, a local pressure sensor (120) for detecting a pressure of nitrogen gas injected into the accumulator (10) A local system 100 including the monitoring device 110 and constructed for each intake and exhaust valve device; A central monitoring device (200) for receiving the peak value of the nitrogen gas pressure cycle from the local monitoring device (110) of the local system (100) constructed for each of the intake and exhaust valve devices and outputting it to a screen divided for each accumulator (10); And a control unit.

The central monitoring apparatus 200 determines normal when the peak value of the nitrogen gas pressure per cycle is equal to or greater than the predetermined first threshold value C1 and determines that the peak value is less than the predetermined first threshold value C1, (C2, C2 < C1), it is judged that the gas is refilled with nitrogen gas, and when it is less than the second threshold value C2, it is judged that the parts are replaced and the judgment result for each accumulator 10 is output to the corresponding divided screen .

The central monitoring apparatus 200 analyzes the trend of the peak value of the nitrogen gas pressure by the cycle and outputs the trend line on the graph showing the time variation of the peak value per cycle.

The central monitoring apparatus 200 predicts a time point at which it is determined to be recharged or a time point at which it is determined to replace the parts according to a trend line.

The central monitoring apparatus 200 may adjust the first threshold value C1 set for each accumulator 10 on the graph and compare the first threshold value C1 with the nitrogen The integrated screen showing the change in the peak value of the gas pressure by the period is superimposed on the graph and the combined screen is displayed so that the existence or nonexistence of the accumulator 10 having the graph below the first threshold value C1 And outputs a position on the screen of the divided screen of the accumulator 10 which is less than the first threshold value C1.

The local monitoring apparatus 110 performs a logger function of storing fluctuation data of the nitrogen gas pressure sensed by the gas pressure sensor 120. The central monitoring apparatus 200 determines whether the recharging determination The local monitoring device 200 requests and receives variation data of the nitrogen gas pressure with respect to the accumulator 10 and outputs the data to the screen.

The central monitoring device 200 communicates with the local monitoring device 110 through short-range wireless communication.

The central monitoring apparatus 200 is characterized in that the time-varying peak-to-peak value of the nitrogen gas pressure is determined as a component replacement at the time of a preset dangerous change rate R.

The gas pressure sensor 120 is mounted on a portion of the accumulator 10 where it is inserted into the nitrogen gas injection space 11a from the gas valve 15 closing the gas inlet 14 to detect the nitrogen gas pressure, The monitoring device 110 determines whether or not to recharge by detecting a peak value appearing after the nitrogen gas pressure rises to the preset reference value C. The first threshold value C1 and the second threshold value C2 are determined by the nitrogen gas injection The initial peak value of the nitrogen gas pressure detected at the beginning of the operation of the engine is multiplied by a predetermined ratio.

According to the present invention configured as described above, it is determined whether or not the nitrogen gas pressure of the accumulator, which fluctuates periodically according to the operation of the engine, according to the change in peak value reflecting the compression state, And an advantage that an accurate determination can be made and an advantage of being able to notify timely when the refueling is required can be made, and the maintenance of the accumulator can be carried out even while the engine is running.

In addition, the present invention collects and monitors the peak values reflecting the suitability of the pressure of the nitrogen gas injected into the accumulator (10), while centrally monitoring the plurality of accumulators (10) The state of the accumulator 10 can be easily grasped.

1 is a configuration diagram of a multi-channel accumulator nitrogen gas pressure monitoring system of an intake and exhaust valve device for a super-large-sized engine according to an embodiment of the present invention.
2 is a block diagram of the local system 100;
3 is a cross-sectional view of an accumulator 10 in which a gas pressure sensor 120 and a hydraulic pressure sensor 130 of the local system 100 are installed.
FIG. 4 is a graph showing changes in the peak value of the nitrogen gas pressure injected into the accumulator 10 by period. FIG.
FIG. 5 is a diagram showing a ripple phenomenon in an excessively enlarged section of the peak of the nitrogen gas pressure according to the cycle of FIG. 4; FIG.
6 is an operational flowchart of the central monitoring apparatus 200. FIG.
7 is an example of a screen output from the central monitoring apparatus 200. Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is an overall block diagram of a multi-channel accumulator nitrogen gas pressure monitoring system for a super large-capacity engine exhaust valve valve apparatus according to an embodiment of the present invention, in which a plurality of intake and exhaust valve devices, each having two accumulators 10, 100, and each local system 100 is connected to a single central monitoring device 200 by wireless communication, wherein the wireless central monitoring device 200 is shown as a block diagram.

FIG. 2 is a block diagram of the local system 100, and the local monitoring apparatus 110 is shown as a block diagram.

3 is a sectional view of an accumulator 10 in which a gas pressure sensor 120 and a hydraulic pressure sensor 130, which are components of the local system 100, are installed.

1, a multichannel accumulator nitrogen gas pressure monitoring system for a super large-capacity engine exhaust gas valve apparatus according to an embodiment of the present invention is constructed by arranging one for each of a plurality of intake and exhaust valve devices provided in a super- A central monitoring device 200 connected to each rocker system 100 by short range wireless communication to monitor the nitrogen gas pressure of each accumulator 10, .

In general, since two accumulators 10 of the hydraulic apparatuses used for driving the intake and exhaust valve devices are provided, the local system 100 is shown to be installed for each of the two accumulators 10.

In describing the embodiment of the present invention, the accumulator 10 will be briefly described with reference to Fig. 3, although it is a well-known technique.

The super-large-sized engine is provided with a plurality of cylinders for performing piston motion by sucking-compressing-explosion-exhausting the fuel to obtain a high output. To this end, an intake and exhaust valve device for sucking-compressing-explosing- . The intake and exhaust valve devices attached to each cylinder are configured to include a hydraulic device that drives the intake and exhaust valves to the oil pressure of the oil.

The accumulator 10 to which the embodiment of the present invention is applied is an accumulator of the hydraulic device for the intake and exhaust valve driving device of the engine. The accumulator 10 is installed in the middle of the pipe 1 connecting the hydraulic pump and the hydraulic device, So that the oil pressure device and the pipe 1 can be protected by absorbing the pulsation pressure or the impact pressure of the oil supplied to the oil pressure device, and the oil can be supplied with the instant oil pressure without the aid of the oil pressure pump.

The accumulator 10 is formed by vertically partitioning the inside of the shell 11 by a diaphragm 12 to form an upper space as a nitrogen gas injection space 11a and a lower space as an oil inflow / (11b).

The diaphragm 12 is made of, for example, a rubber material, and the rim is fixed and sealed to the inner wall of the shell 11 along the circumferential direction to divide the inside of the shell 11 into upper and lower spaces. And flows upward and downward as if it is a slug. Accordingly, the nitrogen gas injection space 11a is reduced or expanded according to the oil pressure of the oil flowing in the oil inflow / outflow space 11b and the amount of inflowed oil. When the gas pressure is reduced, the nitrogen gas pressure is increased.

Here, nitrogen gas is injected into the nitrogen gas injection space 11a through the gas inlet 14 passing through the shell 11 so as to have a predetermined pressure. After the nitrogen gas is injected, the gas inlet 14 is closed with the gas valve 15. Of course, the gas valve 15 may be provided with a check valve for injecting nitrogen gas while being mounted on the gas inlet 14.

The oil inflow and outflow space 11b communicates with the inside of the pipe 1 through an oil port 17 passing through the shell 11 so that the oil flowing through the pipe 1 flows out.

3 shows the operation of the accumulator 10 provided in the pipe 1 as described above. As shown by arrows in FIG. 3, the oil pressure of the oil supplied through the pipe 1 The oil flows into the oil inflow and outflow space 11b at this time to lower the oil hydraulic pressure in the pipe 1. Although not shown in the figure, when the oil hydraulic pressure in the pipe 1 is low, the compressed nitrogen gas The oil in the oil inflow / outflow space 11b flows out into the pipe 1 by the pressure of the oil. By reducing the oil pressure change in the pipe 1, the oil pressure pulsation and the impact pressure in the pipe 1 are absorbed to stabilize the oil pressure and ensure the control precision of the hydraulic device.

Nitrogen gas injected or charged into the nitrogen gas injection space 11a is finely leaked to the molecular level through the diaphragm 12 serving as a diaphragm between the nitrogen gas and the oil, so that the nitrogen gas pressure is gradually reduced.

Especially, in the accumulator 10 used for the intake and exhaust valve driving device in the super large engine of the ship, the number of stroke cycles of the engine is very large due to the characteristics of the long-distance ship, So that the number of cycles for maintaining the nitrogen gas pressure at an appropriate level or higher is sufficiently ensured and even if the nitrogen gas is recharged immediately before the operation, the nitrogen gas pressure can be suddenly lowered to an appropriate level or lower during operation of the ship. Furthermore, the diaphragm 12 may deviate to cause leakage of nitrogen gas.

Accordingly, it is desirable to monitor the nitrogen gas pressure of the accumulator 10 during the operation of the engine so that the nitrogen gas can be refilled at an early stage when the nitrogen gas is required to be refilled and the parts need to be replaced. A gas pressure sensor 120 and a hydraulic pressure sensor 130 that are mounted on each of the accumulators 10 provided in two hydraulic pressure devices of the intake and exhaust valve device and a sensing device 130 for sensing the gas pressure sensor 120 and the hydraulic pressure sensor 130 And a local monitoring device 110 for monitoring and receiving a signal from the central monitoring device 200. The local system 100 constructed for each hydraulic device is connected to the central monitoring device 200 through short- Monitoring.

The local monitoring apparatus 110, the gas pressure sensor 120, and the hydraulic pressure sensor 130 constituting the local system 100 will be described with reference to FIGS. 2 and 3. FIG.

The gas pressure sensor 120 senses the nitrogen gas pressure injected into the nitrogen gas injection space 11a.

According to a specific embodiment of the present invention, the gas pressure sensor 120 includes a gas valve 15 for injecting nitrogen gas into the gas inlet 14 through a gas inlet 14, Respectively. That is, the gas pressure sensor 120 is mounted on the end of the gas valve 15 to be inserted into the gas inlet 14 so as to sense the gas pressure in the nitrogen gas inlet space 11a. Of course, the gas valve 15 must penetrate the wire to electrically connect the gas pressure sensor 120 to the local monitoring device 110. [

The oil pressure sensor 130 is a component for sensing the oil pressure in the oil inflow and outflow space 11b. For example, the oil pressure sensor 130 is formed by forming grooves on the inner wall of the oil port 17. However, It is satisfied if the diaphragm 12 is not damaged. Of course, an electric wire for electrically connecting the hydraulic sensor 130 to the local monitoring device 110 must be penetrated through the shell 11.

The present invention may be configured to include only the gas pressure sensor 120 and the local monitoring device 110 without the oil pressure sensor 130. The oil pressure in the oil inflow and outflow space 11a and the oil pressure in the nitrogen gas inflow space 11a ). Therefore, the present invention is configured to include the hydraulic pressure sensor 130 in the description of the embodiment of the present invention.

The local monitoring apparatus 110 monitors the nitrogen gas pressure in the nitrogen gas injection space 11a varying in accordance with the stroke cycle of the engine and the hydraulic oil pressure in the oil inflow and outflow space 11b to calculate the nitrogen gas pressure (A / D) converter 113, a user interface (UI) 114, a wireless communication module 115, and a central processing unit (CPU) 115. The analog unit 112, unit, 111).

The analog unit 112 includes a first analog unit 112a which is electrically connected to the gas pressure sensor 120 and senses the nitrogen gas pressure in the nitrogen gas injection space 11a as an analog signal and amplifies the signal, And a second analog unit 112b which is electrically connected to the oil supply / discharge space 130 to sense the oil hydraulic pressure in the oil inflow / outflow space 11b as an analog signal and amplify the signal.

Of course, the first analog unit 112a and the second analog unit 112b detect and process the nitrogen gas pressure and the oil pressure by dividing the two analogue accumulators 10 into two accumulators 10, 10), and to be distinguished by a preset identifier when transmitting. Here, the identifier is set in advance in the local monitoring apparatus 110 and used.

The A / D converter 113 includes a first A / D converter 113a electrically connected to the first analog unit 112a and converting the analog signal of the nitrogen gas pressure into a digital signal and inputting the digital signal to the signal processing unit 111 And a second A / D converter 113b which is electrically connected to the second analog unit 112b, converts the analog signal of the oil hydraulic pressure into a digital signal, and inputs the digital signal to the signal processing unit 111. [

For example, the user interface 114 may be configured as a touch screen for ease of use. The user interface 114 may be configured to set a rising section determination reference value C to be used for identifying a rising section in the waveform of the nitrogen gas pressure, . Of course, the rising section determination reference value C may be set by the central monitoring apparatus 200 described later, and the set value may be transmitted and used in short range wireless communication.

The wireless communication module 115 is a component for short-range wireless communication with the central monitoring device 200, and can be selected from commonly used short-range wireless communication modules.

The signal processing unit 111 includes a peak value extracting unit 111a for detecting the peak value of the nitrogen gas pressure inputted as a digital signal in real time by applying a rising section discrimination reference value C received through the user interface 114, Here, the peak value of the period of the detected nitrogen gas pressure is transmitted to the central monitoring apparatus 200 through real-time wireless communication.

The detection of the peak value of the nitrogen gas pressure by the cycle and its significance will be described with reference to the graph exemplarily shown in FIG.

FIG. 4 is a graph showing a change in the peak value of the nitrogen gas pressure, and also shows the determination criteria for the normal, caution, and dangerous steps described later.

The "Caution" is a situation in which the nitrogen gas is to be refilled in the nitrogen gas injection space 11a, and the "Critical" state is a state in which the nitrogen gas is not recharged because the amount of nitrogen gas leakage is insignificant. ) "Is a situation in which leakage of nitrogen gas is excessive and there is a suspicion that the component is damaged or detached.

When the engine is operated, the waveform of the nitrogen gas in the accumulator 10 is also increased in accordance with the stroke cycle of the engine and then periodically appears. At this time, considering the operational characteristics of the accumulator 10 for reducing the nitrogen gas pressure change , And the periodic peak value can be used as a main index for judging whether the nitrogen gas pressure is suitable or not.

Accordingly, in the present invention, the peak value of the nitrogen gas pressure per accumulator in each local system 100 is detected, and in the central monitoring apparatus 200, the nitrogen gas pressure of each accumulator In the integrated monitoring, it is determined quickly and accurately whether or not the multiple accumulator is suitable, while reducing the data transfer amount.

For this purpose, the local system 100 should detect the peak value with priority.

When detecting the peak value, comparing the front and rear values of the pressure from the time when the reference value (C) appears, it is determined that the pressure value increases, , The nitrogen gas pressure finally taken is set as the peak value of the cycle. Then, the section where the pressure decreases is skipped. That is, by monitoring the nitrogen gas pressure, the peak value appearing after rising to the rising section discrimination reference value C is detected, and the process of waiting until the rising section discrimination reference value C of the next cycle appears after skipping the falling interval is repeated Thereby obtaining the peak value of each period.

As shown in FIG. 4, the peak value obtained here is a periodic peak value (Pi, i = 1, 2, 3,...) Obtained by discriminating each cycle according to the passage of time with respect to the nitrogen gas pressure P detected with a periodic waveform. ..., n-1, n, n + 1, ...).

The pressure of the nitrogen gas injected into the accumulator 10 is not only fluctuated in the hydraulic pressure in the pipe 1 but also ripple due to factors such as the diaphragm 12 being swung when the hydraulic pressure is adjusted. If the peak value of the nitrogen gas pressure is the peak value of the nitrogen gas pressure in each cycle of the nitrogen gas pressure, an inaccurate value is detected.

FIG. 5 is an enlarged view showing an excessively enlarged section of the peak of the nitrogen gas pressure with respect to the graph of FIG. 4. As shown in FIG. 5, when the waveform of the graph shown in correspondence with the time axis and the pressure axis is different from the graph waveform of FIG. It looks. This should be understood only as a diagram for explaining a section where ripple occurs.

5, the ripples are generated for a predetermined time after the rise, stabilized for a predetermined time after the ripple, and then lowered. Of course, the cycle of ripple can be irregular but is relatively short compared to the period of the nitrogen gas pressure, so whether or not ripple occurs is detectable.

The main cause of the ripple is that the diaphragm 12 is constructed and mounted in accordance with the oil pressure difference between the nitrogen gas injection space 11a and the oil inflow / outflow space 11b.

Therefore, the peak values (Pp1, Pp2, ..., Ppn-2, Ppn-1, Ppn) of each cycle without consideration of ripple become inaccurate values for use as the peak of the nitrogen gas pressure, P1, P2, ..., Pn-2, Pn-1, Pn) of the stabilized state after the elapse of the time dt of the nitrogen gas pressure.

Furthermore, when the "attention" step is reached as illustrated in the graph of FIG. 5, the peak value Pn excluding the influence of the ripple is reduced to the first threshold value C1, which is the " the maximum value Ppn appearing in the waveform does not show a decrease width dPpn corresponding to the first threshold value C1 which is the criterion of the " Quot; judgment error. &Lt; / RTI &gt;

That is, the correct determination results can not be obtained with the maximum values (Pp1, Pp2, ..., Ppn-2, Ppn-1, Ppn) of each cycle without consideration of ripple.

The signal processing unit 111 of the local monitoring apparatus 110 repeats the phenomenon that the nitrogen gas pressure rises after falling down to a period shorter than the period of the nitrogen gas pressure which is relatively shorter than the period of the nitrogen gas pressure The ripple is determined to be less than a predetermined value, and then, the ripple is decreased to a maximum value of the stabilized state. Therefore, when the peak value of the nitrogen gas pressure is detected, You will get a star peak.

Here, the size of the ripple can be determined by, for example, extracting a direct current component (or a section average value) for the original signal of the ripple section and comparing the original signal and the direct current component with each other.

Also, ripples may occur before the peak period, that is, during the rising period of each cycle. However, since the ripple in the rising period is a period in which the value increases as a whole, for example, an average value is obtained for each interval divided by a predetermined interval, Of the total.

According to a specific embodiment of the present invention, when the phenomenon that the nitrogen gas pressure rises after descending is repeated, it is judged as a ripple. When the difference between the minimum value of the adjacent falling period and the maximum value of the rising period becomes equal to or less than a predetermined value with respect to the period in which the ripple is determined, it is determined that the ripple is stopped. Next, the time at which the ripple stops is set as the stabilized time point, and the maximum value appearing thereafter is taken as the peak value of the period of the nitrogen gas pressure.

As a modification of this embodiment, since the ripple will take a form that converges to a certain value, a method of tracking the convergence point and making the tracked convergence point a periodic peak of the nitrogen gas pressure is also good.

According to another embodiment of the present invention, a signal obtained by filtering a period determined as a ripple by a low-pass filter is obtained. Thus, the ripple suppressed signal can be obtained. Next, the peak value in the filtered signal is taken as the peak value of the period of the nitrogen gas pressure.

Since the peak value obtained here is the highest value in the signal reflected to the period where the ripple occurs, it may be different from the peak value obtained after the stopping of the ripple as described above. However, as shown in the drawing of FIG. 5, And the section where the ripple occurs may also be regarded as a section in which the actual peak value is reflected, so that the actual peak value may be used.

It is recommended that the low-pass filter be as close to the actual peak value as possible using a narrow-band low-pass filter.

According to the embodiment of the present invention, since the oil pressure in the oil inflow / outflow space 11b is detected by the oil pressure sensor 130, a logger that stores the correlated nitrogen gas pressure and the oil pressure in a database in association with each other, Function. Such a logger function is used as a data for precisely examining the real-time change of the nitrogen gas pressure, and enables the transmission in response to the request of the central monitoring apparatus 200.

The peak value of the nitrogen gas pressure detected by the local monitoring device 110 of the local system 100 installed for each intake and exhaust valve device (or installed for each hydraulic device constituting each intake and exhaust valve device) (200), and classified by accumulator (10).

The central monitoring apparatus 200 includes a wireless communication module 220 for performing short-range wireless communication with each local monitoring apparatus 110 to receive a peak value of the nitrogen gas pressure per accumulator 10 per cycle, A user interface 240 provided for input setting of a first threshold value 230, a first threshold value C1, a second threshold value C2 or a risk change rate R to be described later and a selection of an operation mode; For example, a lamp or a speaker as an element for outputting an alarm signal, and an alarm 250 in which the peak value per cycle of the nitrogen gas pressure is divided and output for each accumulator 10, And a data processing unit 210 for displaying whether or not the data is suitable.

In the embodiment of the present invention, the adequacy of the nitrogen gas pressure is discriminated as normal, caution, and critical, as described later, so that the on-screen display corresponding to the normal, And is configured to generate an alarm. For example, when using a lamp, the lamp emits light of different colors for normal, attention, and danger, and outputs a sound corresponding to normal, attention, and danger respectively when the speaker is used. As another example, the alarm 250 may include a communication module for transmitting alarm contents to a mobile communication terminal used by an engine manager, or a communication interface.

The data processing unit 210 includes a data collecting unit 211 collecting the peak value of the nitrogen gas pressure for each accumulator 10 by wireless communication and storing the peak value in a database (not shown), a collecting accumulator 10, An analyzer 212 for analyzing the peak value of the nitrogen gas pressure per cycle to determine whether the nitrogen gas pressure is suitable and determining a trend change of the nitrogen gas pressure and a peak value and a suitability of the period of the nitrogen gas pressure per accumulator 10 And an output screen configuring unit 213 for composing a screen reflecting the result and trend change and outputting the screen to the display unit 230. The display screen configuring unit 213 may be a microprocessor configured to perform such a function by a program.

An integrated monitoring process performed under the control of the data processing unit 210 will be described with reference to the flowchart of FIG.

First, the data processing unit 210 selects an operation mode through the user interface 240 (S10).

The operation mode selected here is either an absolute value application mode in which the value set by the user is used as it is and a relative value application mode in which a part of the value to be set is determined according to the initial state of the engine operation.

Next, the data processing unit 210 receives the set values through the user interface 240 (S20).

Herein, the set value input means a minimum allowable value of the steady state with respect to the nitrogen gas pressure, which is a first threshold value (C1) serving as a boundary between normal and attention, and a minimum allowable value A second threshold value C2 that is a boundary between the attention and the danger as a value to be used for the determination of the temporal peak value change rate of the nitrogen gas pressure and a risk change rate R to be used for the risk determination of the nitrogen gas pressure.

Of the set values, the first threshold value C1 and the second threshold value C2 may be input only in the absolute value application mode.

If the rising edge determination reference value C is input, the reference value C is transmitted to the local monitoring apparatus 110 to be set for the peak value detection by wireless communication.

Next, the data processing unit 210 calculates the first threshold value C1 based on the peak value of the period of the nitrogen gas pressure received from the local monitoring device 110 when the relative value application mode is selected (S31) And the second threshold value C2 (S32, S33).

Specifically, under the relative value application mode, the first threshold value C1 and the second threshold value C2 are selected according to the initial peak value of the nitrogen gas pressure appearing at the beginning of the engine operation.

That is, when the engine is operated, the nitrogen gas pressure of the accumulator 10 also rises in accordance with the stroke cycle of the engine and then decreases periodically. Thus, among the peak values of the nitrogen gas pressure transmitted at the beginning of the engine operation, The peak value detected in the period is selected or the peak value which is the maximum among the plurality of peak values obtained during the lapse of the predetermined period from the initial period is selected (S32).

Then, the first threshold value C1 and the second threshold value C2 are selected by multiplying the selected peak value by a ratio smaller than 1 (S33). Here, the ratio of the second threshold value C2 to the first threshold value C1 is predetermined to be lower than the first threshold value C1.

Of course, the first threshold value C1, the second threshold value C2 and the risk change rate R are set for each accumulator 10.

The first threshold value C1, the second threshold value C2 and the risk change rate R set in this way are used in the following suitability determination steps S71 to S78.

Next, the data processing unit 210 constitutes an output screen of the display unit 230 as illustrated in FIG.

7 shows only three divided screens 21, 22, and 23 for graphically showing the peak values of the nitrogen gas pressure with respect to the three accumulators 10, but this is merely an example, and actually, It is possible to divide the screen of the display unit 230 into a larger number of divided screens or to use a plurality of display units 230 to display the divided screens 21, 22 and 23 by the number of the display units 10.

Each of the divided screens 21, 22, and 23 is a graph for graphically showing the peak value of the nitrogen gas pressure per accumulator 10 with a lapse of time in a graph G1. The first threshold value C1, And a second threshold value C2 are displayed on the first screen and one output area of "normal", "attention" and "danger" The identification number 30 is also displayed. Although it is not shown in the drawing, it is preferable to indicate at which position the accumulator 10 is installed in each of the split screens 21, 22, and 23.

Meanwhile, according to the embodiment of the present invention, the integrated screen 20 is added and output together with the divided screens 21, 22, and 23.

The integrated screen 20 is configured to match the first threshold value C1 set for each accumulator 10 on the graph and then to adjust the concentration of the nitrogen gas by the accumulator 10 on the basis of the matched first threshold value C1 It is a screen that graphs the change of peak value per cycle of pressure.

That is, by plotting the peak value of the nitrogen gas pressure per the accumulator 10 per cycle on the coordinate where the first threshold value C1 is uniformly matched, the peak value of the nitrogen gas pressure per cycle becomes the first threshold value C1 ) Is added to the screen of the accumulator 10 which can be easily recognized. Such an integrated screen 20 may be easily distinguished from other divided screens by expressing the screen identification number 30 as, for example, an "integrated screen ".

After such a screen configuration, the data processing unit 210 reconfigures the monitoring screen as follows every time the peak value of the nitrogen gas pressure per accumulator 10 is received in real time (S50).

First, the data processing unit 210 causes the peak value of the received nitrogen gas pressure to be reflected on the divided screen of the corresponding accumulator 10 to be displayed in a graph, and is also displayed on the integrated screen 20 in a superimposed graph (S60).

Next, the data processing unit 210 sequentially performs the conformity determination step (S71 to S78) and the trend analysis step (S80), and outputs the determination result to the divided screens 21, 22, 23 and integrated screen 20, and the future predicted value of the nitrogen gas pressure is also reflected on the split screens 21, 22, 23 so as to be displayed as a trend line.

The conformity determination step (S71 to S79) is performed as follows.

First, if the peak value Pi is equal to or greater than the first threshold value C1 (S71), it is determined to be "normal" (S72). If the peak value Pi is less than the first threshold value C1, (S73).

At this time, the temporal rate of change of the peak value Pi represents the degree of change (for example, the absolute value of the value represented by the negative slope) of the peak value obtained for each cycle over time, (S74). If it is less than the risk change rate (R), the process proceeds to step S75 to compare with the second threshold value C2.

If the peak value Pi is equal to or greater than the second threshold value C2 in step S75, the process of comparing the first threshold value C2 with the second threshold value C2 is determined as "Caution" C2), it is determined to be "critical" (S77).

The accumulator 10 that has made the determination result based on the comparison with the first threshold value C1, the risk change rate R, and the second threshold value C2 with respect to the peak value of the received nitrogen gas pressure per cycle, And displayed on the divided screens 21, 22, and 23 (S78). The determination result is also reflected on the integrated screen 20 to be displayed.

7 shows an expression screen when two accumulators 10 are judged as "normal" in three accumulators 10 and one accumulator 10 is judged as "caution" . That is, in the integrated screen 20, a graph with less than the first threshold value C1 is displayed, and the "attention" display area is activated (for example, as if the lamp is turned on) (10) is present. In addition, a display 40 for alarming is displayed, and the position of the divided screen corresponding to the accumulator 10 judged as "caution" is also displayed. The "attention" display area is also activated on the corresponding divided screen. Of course, in the presence of the accumulator 10 judged as "dangerous ", the same procedure is followed except for the difference that the activated area is the " dangerous"

In summary, when the peak value Pi of the nitrogen gas pressure is equal to or greater than the first threshold value C1, it is determined as "Normal. &Quot; If the first threshold value C1 is less than the second threshold value C2 Critical "if it is less than the second threshold value (C2), and when the rate of change per unit time of the peak value (Pi) per cycle is not less than the risk change rate (R) It is determined as "Critical" because it is in a state of sudden decrease. The result of the determination is reflected on the integrated screen 20 so that the manager can quickly recognize the presence of the accumulator 10 judged as "caution" or "danger " To be displayed on a divided screen.

On the other hand, for the accumulator 10 to which the "caution" or "dangerous" determination is made, after requesting the local monitoring device 200 to receive fluctuation data of the nitrogen gas pressure, It is a good idea to graph real-time fluctuations. At this time, it is preferable to enlarge and display the entire screen without dividing the screen.

It is also advisable to alarm with the alarm 250 if there is a "caution" or a "danger"

The trend analysis step S80 analyzes the fluctuation trend of the peak value of the nitrogen gas pressure received up to now to predict the subsequent peak value and graphically expresses the peak value, Quot; danger "judgment (part replacement judgment) is also predicted and displayed on the screen.

Referring to FIG. 7, a graph G1 indicated by a solid line is a graph of a peak value received up to now, and a graph G2 indicated by a dotted line following the graph is a graph showing a trend line.

By adding such a trend line, for example, even if it is judged as "normal" at present, it is predicted in advance at what point in the future that the "caution" judgment will be received, so that the work schedule to be recharged can be planned in advance.

Although not shown in the figure, it is preferable to output the time point of the "caution" or "danger" judgment as data.

After analyzing the trend, the process returns to the data processing of the peak value of the next received nitrogen gas pressure.

As described above, the monitoring process performed by the local system 100 and the central monitoring apparatus 200 will be described with reference to FIG.

Referring to the graphs shown in FIG. 4, the nitrogen gas pressure P detected after the engine is operated becomes a signal periodically showing a waveform that rises and falls according to the engine stroke.

However, as described above, even if the diaphragm 12 is in a normal state in which the diaphragm 12 is not damaged, the nitrogen gas molecules may leak through the diaphragm 12 and into the oil inflow / outflow space 11b.

Pn-1, Pn, Pn + 1, ..., P2n-1, P2n, P2n + 1, ..., Pn of each period of the nitrogen gas pressure P are calculated. .. are gradually decreased after the engine is started, an alarm for informing the recharging of the nitrogen gas is displayed on the screen when the first threshold value C1 is reached.

If the rechargeable battery is not recharged in spite of an alarm notifying the recharging, the periodic peak value decreases to less than the first threshold value C1 and reaches the second threshold value C2. Accordingly, when the peak value per cycle becomes less than the second threshold value (C2), it is alarmed that the risk corresponds to the part replacement.

If the diaphragm 12 breaks or leaks at the edge of the diaphragm 12, the peak value of the nitrogen gas pressure per cycle will decrease at a rapid rate.

As described above, the nitrogen gas pressure monitoring system of the accumulator according to the present invention has an advantage of being able to determine whether or not the accumulator 10 in operation is interlocked with the engine, It is possible to obtain a judgment result that reflects the operational characteristics of the accumulator 10 that utilizes the force when the nitrogen gas is compressed, since it is determined whether the normal state is normal based on the respective peak values of the periodic waveform.

According to the present invention, since the alarm is divided into "normal "," caution "indicating the necessity of recharging nitrogen gas and" There is also.

Further, according to the present invention, since the peak value of the nitrogen gas pressure per accumulator 10 is collected and analyzed, and the analysis result is displayed in a divided screen, not only rapid result by rapid data processing can be obtained, It is possible to immediately recognize and cope with the accumulator 10 judged as "caution" or "danger ".

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, . &Lt; / RTI &gt; Accordingly, such modifications are deemed to be within the scope of the present invention, and the scope of the present invention should be determined by the following claims.

1: Piping
10: accumulator
11: Shell
11a: Nitrogen gas injection space 11b: Oil inflow / outflow space
12: diaphragm
13: shut-off button 14: gas inlet port
15: gas valve 17: oil port
100: Local system
110: Local monitoring device
111: central processing unit (CPU)
112: analog unit
112a: first analog unit 112b: second analog unit
113: A / D converter (analog to digital converter)
113a: first A / D converter 113b: second A / D converter
114: user interface (UI)
115: Wireless communication module
120: Gas pressure sensor
130: Hydraulic sensor
200: Central monitoring device
210: Data processing unit
211: data collecting unit 212: analyzing unit 213: output screen forming unit
220: Wireless communication module
230: Display language
240: user interface (UI)
250: Alarm

Claims (12)

A multi-channel accumulator nitrogen gas pressure monitoring system for a super large-capacity engine intake and exhaust valve device for integrally monitoring a nitrogen gas pressure of an accumulator (10) provided for each of a plurality of intake and exhaust valve devices mounted on a super-
A local monitoring device 110 for detecting the peak value of the nitrogen gas pressure represented by a periodic waveform in accordance with an engine stroke cycle, a gas pressure sensor 120 for detecting the nitrogen gas pressure injected into the accumulator 10, A local system 100 constructed for each intake and exhaust valve device;
A central monitoring device (200) for receiving the peak value of the nitrogen gas pressure cycle from the local monitoring device (110) of the local system (100) constructed for each of the intake and exhaust valve devices and outputting it to a screen divided for each accumulator (10);
Channel accumulator nitrogen gas pressure monitoring system. The method according to claim 1,
The central monitoring device (200)
(C 1, C 2 <C 1) which is less than the predetermined first threshold value (C1) and equal to or higher than the predetermined second threshold value (C 2, C 2 <C 1) , And when it is less than the second threshold value (C2), it is determined that the part is replaced, and the determination result for each accumulator (10) is output to the corresponding divided screen. Gas pressure monitoring system. 3. The method of claim 2,
The central monitoring device (200)
Wherein the trend of the peak value of the nitrogen gas pressure is analyzed to output a trend line on the graph showing the time change of the peak value per cycle. The method of claim 3,
The central monitoring device (200)
And estimates and outputs a time point at which it is judged as recharging according to a trend line or a time point at which it is determined to replace the parts. 3. The method of claim 2,
The central monitoring device (200)
The first threshold value C1 set for each accumulator 10 is matched on the graph and then the peak value change per cycle of the nitrogen gas pressure per accumulator 10 is calculated on the basis of the first threshold value C1 The presence of the accumulator 10 which is less than the first threshold value C1 due to presence or absence of the downwardly deflected graph is displayed in the overlapped graph, while the first threshold value C1) on the screen of the divided screen of the accumulator (10). 3. The method of claim 2,
The local monitoring device (110)
Performs a logger function of storing fluctuation data of the nitrogen gas pressure sensed by the gas pressure sensor 120,
The central monitoring device (200)
Channel accumulator nitrogen gas pressure monitoring system for requesting and receiving fluctuation data of the nitrogen gas pressure for the accumulator (10) determined to be recharged or part replacement to the local monitoring device (200) and outputting the data to the screen. 3. The method of claim 2,
The central monitoring device (200)
And when it is determined that the rate of change of the peak value of the nitrogen gas pressure in time exceeds the preset value of the rate of change of the risk (R), it is determined that the part is replaced. The method according to claim 1,
Wherein the central monitoring device (200) communicates with the local monitoring device (110) in short-range wireless communication. 3. The method of claim 2,
The gas pressure sensor (120)
A nitrogen gas pressure is sensed by being mounted on a portion of the accumulator 10 where it is inserted into the nitrogen gas injection space 11a from the gas valve 15 closing the gas inlet 14,
The local monitoring device (110)
The peak value appearing after the nitrogen gas pressure rises to the preset reference value C is detected to judge whether or not to recharge the nitrogen gas,
The first threshold value (C1) and the second threshold value (C2)
Wherein the initial peak value of the nitrogen gas pressure detected at the initial stage of the operation of the engine after the nitrogen gas injection is multiplied by a predetermined ratio to determine the multi-channel accumulator nitrogen gas pressure monitoring system. 8. The method according to any one of claims 1 to 7,
The local monitoring device (110)
Characterized in that the peak value of the stabilized state is detected as the peak value of the period of the nitrogen gas pressure after the ripple size is reduced to a value less than a predetermined value when the peak value of the nitrogen gas pressure is detected, Monitoring system. 11. The method of claim 10,
The local monitoring device (110)
The maximum value after the difference between the minimum value of the adjacent descending section and the maximum value of the ascending section becomes less than a predetermined value when the nitrogen gas pressure rises after the descent is repeated is determined by the period of the nitrogen gas pressure Characterized in that the monitoring system is a peak-to-peak multichannel accumulator nitrogen gas pressure monitoring system. 8. The method according to any one of claims 1 to 7,
The local monitoring device (110)
Characterized in that the maximum value in the signal obtained by filtering the section in which the ripple occurs with the low-pass filter is used as the peak value of the period of the nitrogen gas pressure when detecting the peak value per cycle of the nitrogen gas pressure, Pressure monitoring system.

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