KR20120032725A - A device and a method for condition diagnosis on engine of diesel generator for power plant - Google Patents

Abstract

PURPOSE: A device and a method for diagnosing the state of a diesel engine in a power plant are provided to enable precise and accurate diagnosis of diesel engine condition using signals processed through a frequency band filter. CONSTITUTION: A device(100) for diagnosing the state of a diesel engine in a power plant comprises a sensor unit(110), a signal receiving and processing unit(120), a data display unit(130), and a database(140). The sensor unit senses the state of the interior and exterior of a diesel engine cylinder in a power plant using a pressure sensor(111), a vibration sensor(112), an ultrasonic sensor(113), a crank shaft speed sensor(114), a temperature sensor(115), and a lubricating oil abrasive particle sensor. The signal receiving and processing unit receives data through the sensor unit and coverts the received data into pressure value, vibration value, and ultrasonic wave value. The data display unit displays the value converted by signal processing on a graph as a result value of a cylinder analysis index. The database senses and diagnoses the condition of the engine by the transition analysis of the data.

Description

Diesel engine condition diagnosis device and method {A DEVICE AND A METHOD FOR CONDITION DIAGNOSIS ON ENGINE OF DIESEL GENERATOR FOR POWER PLANT}

The present invention measures the pressure, ultrasonic signal and vibration signal of the power plant diesel engine at the same time as the crankshaft speed value to diagnose the operating state inside and outside the cylinder for each four-stroke or two-stroke period for each cylinder to detect whether it is a normal operating state, The present invention relates to a power plant diesel engine state diagnosis apparatus and method capable of comprehensively determining the operating state of a power plant diesel engine through analyzing a measurement signal using multiple sensors and analyzing a power plant operating variable.

The emergency AC system used to secure the safety of nuclear power plants is designed and operated to ensure sufficient independence, multiplicity, and testability to perform safety functions even in the event of a single failure.

The emergency AC power system is designed to supply diesel generators to the bus to supply power to safety-related loads that affect the safe operation of the plant in a short time in the event of an off-site AC power supply, which is intended to be supplied from outside of the plant during plant operation. Is installed.

However, if a power failure occurs that causes the diesel generator to be inoperable at the same time as the loss of off-site AC power, a station blackout accident occurs in which the AC power in the nuclear power plant is completely lost. You can't stop it.

If such a nuclear power plant outage occurs, it is highly probable that the reactor core will be damaged, and the most important measure to reduce the possibility of power failure in the power plant should be to maintain high reliability and maintain operation at all times.

Therefore, there is a need for a technology that monitors and diagnoses the condition of diesel engines so that they can determine whether they can operate normally at any time.

This diesel engine diagnosis technology monitors the performance state of diesel engines and predicts the abnormal state by identifying the dynamic characteristics occurring in the combustion process of diesel engines. In the case of diesel engine cylinders with fault symptoms, they are analyzed through trend analysis. Preventive maintenance can be performed effectively to prevent preventive maintenance.

In order to monitor and evaluate the performance of diesel engines, the explosion pressure inside the diesel engine, the normal operating state of the intake and exhaust valves of the diesel engine, the vibration state of the diesel engine, and the crankshaft angle of the diesel engine, are various signals generated inside the diesel engine. It analyzes the soundness of the diesel engine by acquiring various signals for measuring and the like and analyzing these signals.

By using this analysis result, the operating condition of the diesel engine in operation is accurately identified to balance the diesel engine to generate uniform power in the cylinder of the diesel engine, thereby performing the performance of the diesel engine as well as the performance of the diesel engine. It is necessary to maintain the operating state optimally.

Conventionally, the condition check of a diesel engine includes a method of diagnosing only a cylinder pressure, a method of diagnosing a diesel engine state only by changing a crankshaft speed, and a visual decomposition maintenance method.

However, conventional methods do not use multiple sensors to analyze various signals, so the overall operating state of the diesel engine, the intake and exhaust valves, the start of combustion, the maximum explosion pressure, the internal cylinder leakage, etc. There was a problem that can not be accurately diagnosed comprehensively.

The problem to be solved by the present invention is to solve the problems of the prior art, simultaneously measuring the pressure inside the diesel engine, ultrasonic signals and vibration signals, crankshaft speed, temperature analysis of the cylinder feed fuel, wear particles of lubricating oil Through the analysis and analysis of power plant operating variables, it comprehensively analyzes the explosion time, the explosion pressure size, the opening and closing time of the intake and exhaust valves, the combustion start time, the leakage inside the cylinder, the wear of the piston, and the output performance of each cylinder. By doing so, it is possible to accurately determine the abnormal state of the diesel engine.

Another task to solve the present invention is to remove the noise contained in the signal measured by the sensor, to amplify the weak signal, and to pass the frequency band filter based on the signal processed by the individual cylinder, the average effective pressure By automatically calculating engine performance such as heat generation rate vs. crank angular velocity for each cylinder, it compares the engine status with the set value in real time to determine whether it is in normal or abnormal condition. It is to prevent the failure of power plant diesel engine and to improve the reliability of operation.

The solution of the present invention is to detect the overall performance and state of the cylinder inside and outside the power plant diesel engine using a multi-sensor consisting of pressure sensor, vibration sensor, ultrasonic sensor, crank shaft speed sensor, temperature sensor and lubricant wear particle detection sensor And a signal acquisition and processing unit for acquiring a signal through the sensor unit, and converting the acquired signal into a pressure value, a vibration value, and an ultrasonic value in the order of explosion pressure, and acquiring and processing the signal from the sensor unit. It is in charge of device control such as data operation and data display and storage, and the control and data display unit which shows the graph or diagnosis status as the result value of the analysis index for each cylinder by the value converted by signal processing, and the measured value and the final value. Long-term monitoring and evaluation of engine status by storing analysis results and trend analysis of data The diesel engine plant state diagnostic device that contains the database that is to be implemented.

Another solution of the present invention is to obtain data through a pressure sensor, an ultrasonic sensor, a vibration sensor, a crank shaft speed sensor, a temperature sensor, and a lubricant wear particle sensor, and to obtain the obtained signal in accordance with the order of explosion pressure for each cylinder After acquiring and processing the signal that converts the pressure value, the vibration value, and the ultrasonic value, the engine condition analysis index is computed and diagnosed in a diagnostic program, and the current state is compared with the reference value to determine whether it is in a normal state. Through the process of displaying the final analysis result value for each cylinder as a value converted by the signal processing, or by outputting the diagnostic status and displaying, and the step of storing and database the measured value and the final analysis result value, Power plant diesel, which includes monitoring and evaluating engine status over time through trend analysis To provide a binary state diagnosis method.

Another solution of the present invention is to install a multi-sensor in the diesel engine to diagnose the condition to obtain data on the internal and external conditions of the engine, noise removal for removing noise from the surroundings for accurate signal measurement A filter, a signal amplifier for amplifying weak signals, and a frequency band filter for acquiring a signal of a required frequency band, and include an indication output of an individual cylinder calculated as a processed signal value, an average effective pressure, and a crank angular velocity for each cylinder. Engine performance such as heat generation rate is automatically calculated, and the maximum, minimum, average, median and standard deviations between cylinders are calculated, and engine status is compared with the set value in real time to determine whether it is normal or abnormal, Intake and exhaust valve opening and closing time, combustion start time, maximum explosion pressure generation time and cylinder leakage An apparatus and method for diagnosing a state of a diesel engine state of a power plant capable of identifying the same are provided.

The present invention comprehensively diagnoses and maintains a diesel engine state such as a self-operating state of the diesel engine, an intake and exhaust valve operation point, combustion start point, maximum explosion pressure generation point, internal leakage due to cylinder wear and the like by using multiple sensors. And there is an advantageous effect that can be achieved efficiently.

Another effect of the present invention is to diagnose and check the abnormal state of the diesel engine more accurately and precisely by applying various sensors and analyzing the operating parameters of the power plant, thereby improving the failure prevention and operating reliability of the power plant diesel engine.

1 is a block diagram of a power station diesel engine state diagnosis apparatus according to an embodiment of the present invention.
Figure 2 is a flow chart for explaining a diesel engine state diagnosis method for a power plant according to an embodiment of the present invention.
3 is a view for explaining the sensor unit and the signal acquisition and processing unit of the power plant diesel engine state diagnosis apparatus according to an embodiment of the present invention.
4 is an explanatory diagram showing a control and data display of the power plant diesel engine state diagnosis apparatus according to an embodiment of the present invention.
5 is an exemplary view showing a measurement result of the control and data display unit of the power plant diesel engine status diagnosis apparatus according to an embodiment of the present invention.
6 is a screen for explaining a database of the power plant diesel engine status diagnosis apparatus according to an embodiment of the present invention.
100; Diesel engine condition diagnosis device 110; The sensor unit
111; Pressure sensor 112; Vibration sensor
113; Ultrasonic sensor 114; Crankshaft speed sensor
115; Temperature sensor 117; Sensor Power Supply
117; Lubricant Wear Particle Sensor
120; Signal acquisition and processing unit 130; Control and data display
140; Database 180; Power supply

Hereinafter, the present invention will be described in detail. The present invention comprises a sensor unit for detecting the overall performance and state of the cylinder inside and outside the power plant diesel engine using a multi-sensor consisting of a pressure sensor, vibration sensor, ultrasonic sensor, crank shaft speed sensor, temperature sensor and lubricant wear particle detection sensor. And a signal acquisition and processing unit for acquiring a signal through the sensor unit and converting the acquired signal into a pressure value, a vibration value, and an ultrasonic wave value in the order of explosion pressure, and acquiring and processing a signal from the sensor unit. It is in charge of device control such as data display and storage, and displays the value converted by signal processing as the result of analysis index for each cylinder as a graph or displays the diagnostic status and the measured value and final analysis result. It is possible to monitor and evaluate the engine condition in the long term by storing the values and analyzing the trend of the data. To provide a power plant diesel engine condition diagnosis apparatus including a database. A specific embodiment according to the present invention will be described.

<Example>

&Lt; Example 1 >

Embodiment 1 of the present invention will be described in detail with reference to the accompanying drawings. Example 1 relates to a diesel engine state diagnosis apparatus for a power plant. 1 is a block diagram showing an embodiment of a power plant diesel engine state diagnosis apparatus according to the present invention.

The present invention includes a sensor unit for detecting the overall performance and state of the cylinder inside and outside the power plant diesel engine using a multi-sensor consisting of a pressure sensor, vibration sensor, ultrasonic sensor, crankshaft speed sensor, temperature sensor and lubricant wear particle detection sensor. have.

In addition, the present invention includes a signal acquisition and processing unit for acquiring data through a sensor unit and converting the acquired signal into a pressure value, a vibration value, and an ultrasonic value in the order of explosion pressure.

A control and data display unit for performing data calculation, data display and storage, etc. based on the signal obtained from the sensor unit, and displaying a graph or diagnostic state as a result of analysis index for each cylinder as a value converted into a digital signal by signal processing. Equipped with.

It is provided with a database for storing the value obtained by converting the signal obtained from the sensor unit to the A / D converter and the final analysis result value, and monitoring and evaluating the engine condition for a long time through the trend analysis of the data.

Each of the above components will be described in detail. In FIG. 1, the power plant diesel engine state diagnosis apparatus 100 includes a sensor unit 110, a signal acquisition and processing unit 120, a control and data display unit 130, a database 140, and a power supply unit 180.

In FIG. 1, the power plant diesel engine state diagnosis apparatus 100 using multiple sensors includes a pressure sensor 111, a vibration sensor 112, an ultrasonic sensor 113, a crankshaft speed sensor 114, a temperature sensor 115, and the like. The sensor unit 110 including the lubricant wear particle detection sensor 117 is provided, and a signal necessary for diagnosing the diesel engine is acquired through the sensor unit.

In addition, a signal acquisition and processing unit 120 for converting signals acquired from various sensors located in the sensor unit into pressure values, vibration values, and ultrasonic values in the order of explosion pressure, and acquires and processes signals from the sensor unit, and calculates data. And a technical configuration for displaying and storing data.

The control and data display unit 130 converts the signal obtained from the sensor unit into a digital signal by an A / D converter, and converts the converted value into a result value of the analysis index for each cylinder, indicating a graph or a diagnosis state, and the measured value and the final value. The database 140 may be configured to store the analysis result value and to monitor and evaluate the engine state in the long term through trend analysis of the data.

The data stored in the database 140 may be used to monitor, diagnose, and evaluate the engine state.

In the power plant diesel engine state diagnosis device 100, a multi-sensor is installed at an inside and an outside of a diesel engine facility for diagnosing a state to acquire a signal indicating an inside and outside state of a diesel engine, and to remove ambient noise for accurate signal measurement. It is configured to acquire a signal through a noise reduction filter, a signal amplifier for amplifying a weak signal, and a frequency band filter for acquiring a signal of a set frequency band in order to obtain only a signal necessary for maximum diagnosis.

The diesel engine state diagnosis device 100 passes the noise canceling filter, the signal amplifier, and the frequency band pass filter, and then uses the value converted into a digital signal to indicate the output and average effective pressure of each cylinder by a control program mounted in the memory. And means for automatically calculating engine performance such as heat generation rate relative to the crank angular velocity for each cylinder, and means for calculating and indicating the maximum, minimum, average and standard deviation between cylinders.

The diesel engine state diagnosis apparatus 100 includes means for diagnosing whether the engine is in a normal state or an abnormal state by comparing the signal measured by the sensor with a setting value stored in the memory in order to diagnose and predict the engine state in real time. For example, the opening and closing time of the intake and exhaust valves, the start of combustion, the time of the maximum explosion pressure, the cylinder leakage state, and the like can be confirmed.

The diesel engine state diagnosis device 100 graphically outputs the final analysis result data for each cylinder of the diesel engine, and diagnoses the result and the change in the combustion pressure for each cylinder, the heat generation rate relative to the crank angular velocity for each cylinder, the start of combustion and the maximum. Means for indicating an explosion pressure generation angle and the like are provided.

The diesel engine state diagnosis apparatus 100 includes a database and a memory for storing and managing measured values and final analysis result values, and is equipped with a control program for performing the various configurations and means described above.

3 is a view for explaining the sensor unit 110 and the signal acquisition and processing unit 120 of the power plant diesel engine state diagnosis apparatus according to the first embodiment of the present invention.

First, the sensor unit 110 is a pressure sensor 111, vibration sensor 112, ultrasonic sensor 113, crankshaft speed sensor 114, cylinder supply fuel temperature temperature measuring sensor 115 and lubricating oil wear particle sensor ( 117).

The sensor unit 110 measures the pressure inside the power plant diesel engine, the ultrasonic signal and vibration signal of the main part of the diesel engine, the crankshaft speed, the temperature analysis of the cylinder feed fuel, the wear particles of the lubricating oil, and the power plant operating variables. Enter it. Here, the power plant operating variable means that measured by the power plant measuring sensor other than the device according to the present invention, it may be input separately by the device of the present invention.

The pressure sensor 111 is used to diagnose the state of the engine by measuring the explosion pressure inside the diesel engine cylinder. Since a high temperature explosion occurs inside the cylinder, a separate auxiliary jig is installed at the rear of the engine valve indirect valve to measure the pressure indirectly. Even if the pressure is measured indirectly using a jig, the pressure sensor is indirectly exposed to high temperature, so the pressure sensor uses a sensor that can withstand high temperatures up to 350 ° C. The voltage supplied to the pressure sensor 111 requires a DC voltage between 10V and 30V, and the sensor output voltage is a DC voltage between 0V and 5V.

The vibration sensor 112 is used for the purpose of diagnosing the operating state of the valve and the internal explosion state by measuring the vibration of the engine. Since a high sensitivity vibration measurement is required, the vibration sensor 112 is configured as a sensor having a sensitivity of 500 mV / g or more. The vibration sensor uses an internal amplified acceleration sensor (ICP) configured to receive power from the data acquisition device. Among them, the ICP (input voltage) between 18V and 24V is applied in consideration of compatibility with other equipment. 126) Measure with an accelerometer. Considering that the vibration sensor is a sensor for measuring the state of the engine, a vibration measuring auxiliary jig using a magnetic stud may be separately manufactured for easy installation in the engine block.

The ultrasonic sensor 113 is used for the purpose of diagnosing the operating state of the valve and the internal explosion state by installing the ultrasonic signal generated from the operating diesel engine in the engine block. In particular, it is used for the purpose of accurately measuring the operating state of the engine by measuring a high frequency component up to about 44 kHz. The ultrasonic sensor 113 has a function of constant response from 10 kHz to 120 kHz to measure ultrasonic components of all frequencies. In addition, it has sufficient sensitivity of 0.5 mV / Pa or more, and the preamplifier 127 must have an even response at all frequencies above the measurement frequency range. In order to increase the sensitivity of the ultrasonic sensor and convenience of measurement, a separate measuring tool may be manufactured and used.

A crankshaft speed sensor (rpm sensor) 114 is used to measure the piston position every moment of each cylinder. The crankshaft speed sensor 114 may be installed to generate one or more pulses per revolution to accurately diagnose the relative position based on the top dead center (TDC) of the engine.

Due to the characteristics of the emergency generator, the crankshaft speed sensor 114 may be configured as an optical method or a laser sensor, and is installed on the engine crankshaft to ensure an operating distance of at least 3 m. Crankshaft speed sensor 114 can be used to produce an auxiliary jig to check the maintenance of the horizontal state. The speed range of the crankshaft speed sensor 114 may be configured to a speed range of 1 to 250,000 RPM, an output signal of 0 V to 5 V, and an operating range of up to 3 m.

The temperature sensor 115 is configured in an infrared manner and installed at the rear end of the fuel pump to measure the temperature of the fuel sucked into the cylinder. The temperature range is between -30 ° C and 100 ° C so that the temperature of the fuel drawn into the cylinder can be measured.

The power supply device 116 of the sensor unit is a device for supplying power suitable for driving to the sensor unit 110 and the signal acquisition and processing unit 120 after receiving power from the outside. Sensors requiring power supply are a vibration sensor 112, an ultrasonic sensor 113, and a crankshaft speed sensor 114, each of which can supply a direct current 12V. In addition, the signal acquisition and processing unit 120 may be supplied with a direct current 12V of the same voltage magnitude.

The lubricating oil wear particle sensor 117 is mounted on a separate analyzer, receives oil of a diesel engine as a sample, analyzes the components for wear particles, and then measures the measured data of the diesel engine state diagnosis device through a communication method through RS-232 ( 100 is configured to transmit and enter off-line or on-line.

The signal acquisition and processing unit 120 includes a main power supply unit 180, a data acquisition unit (DAQ) 121, a power supply unit 122, a pressure signal input module 123, a vibration signal input module 124, and a crank shaft. Speed and temperature input module 125, vibration signal amplifier 126 and the ultrasonic signal amplifier (127).

The signal acquisition and processing unit 120 collects and processes data in order to analyze signals measured from various sensors. The signal acquisition and processing unit 120 removes noise to remove noise included in the signal and amplifies the signal measured by the sensor unit. It is equipped with a filter, and consists of an analog to digital converter (Analog to Digital Converter) for converting the measured analog signal to a digital signal.

The signal acquisition and processing unit 120 is concisely and robustly configured to be portable. The channels that can be measured at one time to measure all the channels of a diesel engine of a power plant include 8 pressure sensors, 2 acceleration vibration sensors, and an ultrasonic sensor. It can be composed of 2 channels, 1 temperature sensor and 1 channel of crankshaft speed sensor (rpm sensor). It can also be equipped with an RS-232 communication port for connection to an oil wear analyzer.

The measurement signal sampling rate of the signal acquisition and processing unit 120 is configured to be at least 100 kS / s, and is configured to synchronize all channels. The signal resolution is 16 bits or more, so that accurate measurement is possible.

Figure 4 shows the control and data display unit 130 of the power plant diesel engine status diagnosis apparatus according to the first embodiment of the present invention. The controller equipped with a computer or a microprocessor includes a data acquisition device (DAQ) 121 and a control and data display unit 130, and controls the control and measurement data of the diesel engine state diagnosis device and stores measurement data. To perform.

4 shows the control and data display unit 130 of the diesel engine state diagnosis apparatus.

The data display screen 300 of the control and data display unit 130 displays an analysis index display unit 310 indicating an analysis index calculation result, a signal measured from multiple sensors, and an analysis result based on the measured signal. Select the signal analysis result display unit 320, the data setting display unit 330 disposed on the screen to set the data acquisition and storage conditions and the engine cylinder to be measured and the cylinder selection to input and display the analysis index for analysis The display unit 340 is included.

Figure 5 shows the measurement results in the control and data display unit 130 of the power plant diesel engine state diagnosis apparatus according to an embodiment of the present invention.

On the screen of the control and data display unit 130 showing the measurement result of FIG. 5, each measured signal is displayed on the X axis 321 in degrees crankshaft (degree, degrees), and each measured signal on the Y axis 322. Indicates the size. Referring to FIG. 5, the measurement result screen may display a vibration signal 323, a heat generation rate curve 324, a pressure signal 325, an ultrasonic signal 326, and other measurement signals 327.

In displaying the measurement and analysis results of the control and data display unit 130, all measured data are configured to be output in an Excel form, and the analysis results can display and output a standardized diagnostic state. It is configured to output the diagnosis status to Excel.

In addition, the display of the diagnostic status is configured in the form of a template so that the user can edit and save the basic format given in the execution program.

In the storage of the measurement and analysis results of the control and data display unit 130, the measurement and analysis results are stored in the form of a file, and all the data are included in one file so as to be managed in a file unit. In addition, the size of the file is configured to be minimized, and the form of storage is configured to be easily compatible with other programs. Configure to receive data in the form of Excel file created according to a specific template.

Figure 6 shows a screen for explaining the database 140 of the power plant diesel engine status diagnosis apparatus according to the first embodiment of the present invention.

The database 140 is configured to compare the engine diagnostic data including the main analysis indicators for each plant measurement cycle (before and after the planned preventive maintenance), and the user selects a diagnostic variable to determine the trend of the measurement data. Diagnostic prediction can be made by comparison.

In addition, the operating variable data can be configured to compare the trend of each plant measurement cycle (before and after planned preventive maintenance), and the user can select the operating variable to compare the trend of the operating variable.

In the database 140 of the diesel engine state diagnosis apparatus of FIG. 6, the measured value and the final analysis result value are stored, and the analysis screen 400 of the database capable of long-term monitoring and evaluation of the engine state through data analysis. Reads the trend analysis screen 410, the screen 420 for storing in the database by date and time, the screen 430 for setting the hierarchical structure and measurement variables required for the database, and the size of the trend analysis screen using a cursor. It can be configured to include a trend analysis screen size display screen 440, etc. to allow.

&Lt; Example 2 >

Embodiment 2 of the present invention will be described in detail with reference to the accompanying drawings. Example 2 relates to a method for diagnosing a diesel engine state of a power plant. 2 is a flowchart illustrating a method for diagnosing a state of a diesel engine state of a power plant according to Embodiment 2 of the present invention.

In the diesel engine state diagnosis method according to the second embodiment of the present invention, data is acquired through a pressure sensor, an ultrasonic sensor, a vibration sensor, a crankshaft speed sensor, a temperature sensor, a lubricant wear particle sensor, and the like, and the obtained signal is determined for each cylinder. And a signal acquisition and processing step of converting the pressure value, the vibration value, and the ultrasonic value according to the explosion pressure sequence.

The diesel engine state diagnosis method of the power plant includes calculating an engine state analysis index in a diagnostic program, and comparing the measured value with a setting value stored in a memory to determine whether the stationary state is normal.

The diesel engine status diagnosis method of the power plant includes a graphic display of the final analysis result value for each cylinder analyzed based on the value converted by the signal processing, or a diagnostic output as data. Storing and databaseting the final analysis result values.

The diesel engine condition diagnosis method of the power plant of Example 2 omits specific descriptions for the easily predictable from Example 1 above.

Although a preferred embodiment of the present invention has been described based on the above-described embodiment 1 and embodiment 2, those skilled in the art can be variously modified from the above-described embodiment 1 and embodiment 2. It will be appreciated that such modifications also fall within the protection scope of the present invention.

The present invention measures the diesel engine pressure, ultrasonic signals and vibration signals at the same time as the crankshaft speed value to detect whether the operating state inside and outside the cylinder is normal operation for each four-stroke or two-stroke period for each cylinder, and measuring signals using multiple sensors Through the analysis and analysis of power plant operating variables, we provide a power plant diesel engine status diagnosis device and method that can comprehensively diagnose abnormal conditions of power plant diesel engines. It can be achieved by the industrial use is very high.

Claims (23)

In the power plant diesel engine state diagnosis device,
A sensor unit for detecting a state inside and outside the cylinder of the power plant diesel engine using a pressure sensor, a vibration sensor, an ultrasonic sensor, a crank shaft speed sensor, a temperature sensor, and a lubricant wear particle detection sensor;
A signal acquisition and processing unit for acquiring data through the sensor unit and converting the acquired signal into a pressure value, a vibration value, and an ultrasonic value in an explosion order of two-stroke or four-stroke periods through values measured simultaneously with the crankshaft angle;
A data display unit for displaying the data acquired and processed by the sensor unit, and displaying a value converted by the signal processing as a result of the analysis index for each cylinder as a graph; And
And a database for storing the measured values and the final analysis result values, and including a database for monitoring and diagnosing engine status through trend analysis of the data. The method of claim 1,
The sensor unit includes a pressure sensor for measuring the pressure inside the engine cylinder at the same time as the crankshaft angular speed to diagnose the state of the engine;
A vibration sensor for diagnosing an operation state and an internal abnormal state of the intake / exhaust valve by measuring vibration of the engine at the same time as the crankshaft angular speed;
Ultrasonic sensors for diagnosing the operating state of the intake and exhaust valves and the operation of the fuel pump by measuring the ultrasonic signal of the engine at the same time as the crankshaft angular speed;
A crankshaft speed sensor for measuring the piston position every moment of each cylinder;
A temperature sensor for measuring a temperature of the fuel sucked into the cylinder at the rear of the fuel pump; And
A diesel engine condition diagnosis apparatus comprising a lubricant wear particle sensor which receives oil of a diesel engine as a sample and analyzes a component for wear particles, and then transmits and inputs the oil to a diesel state diagnosis apparatus. The method according to claim 1 or 2,
The pressure sensor can withstand a high temperature of up to 350 ℃, the sensor supply voltage requires a supply of a DC voltage of 10 ~ 30 V, the power output characterized in that the sensor output voltage is a DC voltage of 0 ~ 5 V Diesel engine condition diagnosis device. The method according to claim 1 or 2,
The vibration sensor is a high sensitivity of 500 mV / g or more, the power plant diesel engine status diagnosis device, characterized in that composed of an acceleration sensor. The method according to claim 1 or 2,
The ultrasonic sensor measures a high frequency component up to 44 kHz, the diesel engine state diagnosis apparatus, characterized in that it has a sensitivity of 0.5 mV / Pa or more. The method according to claim 1 or 2,
The crankshaft speed sensor is composed of an optical method or a laser method due to the characteristics of the diesel engine of the power plant, the speed measuring range is 1-250,000 RPM, the output signal is 0-5V, and the measuring distance is composed of a maximum of 3m. Diesel engine condition diagnosis device. The method according to claim 1 or 2,
The temperature sensor is a power plant diesel engine status diagnostic apparatus, characterized in that the infrared temperature has a measuring temperature range of -30 ℃ ~ 100 ℃. The method according to claim 1 or 2,
The lubricant wear particle sensor is mounted on a separate analyzer power station diesel engine status diagnostic apparatus, characterized in that the transmission and input to the diesel engine status diagnosis device 100 by offline through a communication method via RS-232. The method according to claim 1 or 2,
Power station diesel engine status diagnosis device comprising a power supply for supplying a direct current 12V to the vibration sensor, the ultrasonic sensor and the crank shaft speed sensor of the sensor unit. The method of claim 1,
The signal acquisition and processing unit includes a noise removing filter for removing noise included in signals measured and input from the sensors of the sensor unit;
A signal amplifier for amplifying a weak signal after removing noise with the noise removing filter;
A frequency band filter for acquiring a signal of a frequency band required when diagnosing a diesel engine condition;
An A / D converter for converting the signal from the noise canceling filter, the signal amplifier and the frequency band filter into a digital signal; And
A diesel engine state diagnosis apparatus for a power plant, comprising means for diagnosing abnormality of data converted into a digital signal by comparing with a set value stored in a memory. The method of claim 10,
The signal acquisition and processing unit converts the signals measured from the sensors into a digital signal, and means for calculating the heat output rate relative to the crank angular velocity for each cylinder, the output output, the average effective pressure and the cylinder calculated on the basis of the converted digital signal;
Means for indicating a maximum value, a minimum value, an average value, a median value, and a standard deviation between cylinders; And
Power station diesel engine with means for diagnosing whether the exhaust valve is open or closed, the start of combustion, the maximum explosion pressure, and the cylinder leakage condition by comparing the engine condition with the set value stored in the memory Status diagnostic device. The method of claim 11,
The power plant diesel engine state diagnosis apparatus includes a graphic indicating a final analysis result data for each cylinder of the diesel engine, a change in combustion pressure for each cylinder, a heat generation rate relative to a crank angular velocity for each cylinder, a start point of combustion and a maximum explosion pressure generation angle; And
A diesel engine condition diagnosis apparatus for a power plant equipped with means for monitoring and diagnosing engine status in real time through trend analysis of necessary data through a built-in database for storing measured values and final analysis result values. The method of claim 12,
In the diesel engine state diagnosis device, each measured signal is displayed in the crankshaft angle on the X-axis, and the magnitude of each measured signal is displayed on the Y-axis on the measurement result screen.
A diesel engine state diagnosis apparatus for a power plant, further comprising a control and data display unit for displaying a vibration signal, a heat generation rate curve, a pressure signal, an ultrasonic signal, and a measurement signal. The method of claim 1,
The signal acquisition and processing unit is composed of 8 pressure sensors, 2 channels of acceleration and vibration sensors, 2 channels of ultrasonic sensors, 1 channel of temperature sensors, and 1 channel of crankshaft speed sensors so that the diesel engine of the power plant can be diagnosed at once. Power station diesel engine status diagnosis device. The method of claim 1,
The signal acquisition and processing unit diesel engine status diagnosis device, characterized in that the RS-232 port is provided for connection with the oil wear analyzer. The method of claim 1,
The signal acquisition and processing unit is configured to configure the measurement signal acquisition rate of at least 100 kS / s, and to synchronize all channels,
Power station diesel engine condition diagnosis apparatus, characterized in that the measurement resolution is composed of 16 bits or more. In the status diagnosis method of power plant diesel engine
Acquire data through pressure sensor, ultrasonic sensor, vibration sensor, crankshaft speed sensor, temperature sensor, and lubricating oil wear particle sensor, and convert the acquired signal into pressure value, vibration value and ultrasonic value in the order of explosion pressure for each cylinder. Acquiring and processing the signal;
Calculating an engine condition analysis index in a diagnostic program;
Diagnosing and determining whether the battery is in a normal state by comparing with a set value stored in a memory in real time;
Displaying data graphically of a final analysis result value for each cylinder based on a value converted into a digital signal in the signal acquisition and processing;
Storing and databaseting the measured value and the final analysis result; And
Diesel engine condition diagnosis method comprising monitoring and evaluating engine condition in the long term through data trend analysis. The method of claim 17,
The acquiring and processing of the signal may include acquiring a signal using a sensor for diagnosing a state inside and outside the engine, and removing noise with a noise removing filter for accurate signal acquisition;
Amplifying the weak signal with a signal amplifier; And
And a step of acquiring a signal of a frequency band necessary for diagnosing the diesel engine with a frequency band filter. The method of claim 18,
The acquiring and processing of the signal may include converting signals measured from the sensors into digital signals, and calculating heat generation rate relative to the crank angular velocity for each cylinder, and the output of each cylinder calculated based on the converted digital signals. step;
Indicating maximum, minimum, average, median, and standard deviation between cylinders; And
The diesel engine of the power plant further comprises the step of diagnosing whether the exhaust valve is open or closed, the start of combustion, the maximum explosion pressure, and the cylinder leakage by comparing the engine condition with a set value stored in the memory. How to diagnose engine condition. 20. The method of claim 19,
The power plant diesel engine state diagnosis method includes displaying a final analysis result data for each cylinder of a diesel engine, a change in combustion pressure for each cylinder, a heat generation rate relative to a crank angular velocity for each cylinder, a start point of combustion, and a maximum explosion pressure generation angle; And
A method for diagnosing the condition of a diesel engine in a power plant further comprising the step of monitoring and diagnosing the engine status in real time through trend analysis of necessary data through a built-in database. The method of claim 18,
The power plant diesel engine state diagnosis method includes displaying a measurement result on a screen through a control and data display unit, displaying each measured signal as a crank axis angle on the X axis, and indicating the magnitude of each measured signal on the Y axis; And
A method for diagnosing a diesel engine state of a power plant, characterized in that it further comprises a step of displaying a vibration signal, a heat generation rate curve, a pressure signal, an ultrasonic signal, and other measurement signals. The method of claim 20,
The database of the diesel engine state diagnosis device is configured to compare the engine diagnostic data with trends for each power plant measurement cycle, and the user can select the diagnostic variables to compare the trend of the measurement data. Diagnostic method. The method of claim 20 or 22,
The database of the diesel engine state diagnosis apparatus is configured to compare the operating variable data with trends for each power plant measurement cycle, and the user can select the operating variable to compare the trend of the operating variables. Diagnostic method.

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