KR20100006230A - Alarm and monitor device of diesel engine status which is enable to measure multi-channel temperature and pressure signal - Google Patents

Abstract

PURPOSE: A diesel engine state checking and warning device for measuring multi-channel temperature and pressure signals is provided to measure the temperature state value regardless of the kind of sensor or a pressure state value. CONSTITUTION: A diesel engine state checking and warning device for measuring multi-channel temperature and pressure signals comprises a multiple channel input part(30), a filter part(50), a rectifier(60), a micro processor unit(90) and a communication interface part(100). The multiple channel input part has OCP(Over Current Protect) circuit preventing the excess current. The noise component including the high frequency and noises is eliminated by the filtering part. A terminal part blocks the excess voltage over than the fixed voltage and the negative voltage according to the specified A/D converter input range. The micro processor unit changes a sensor sensing signal into the digital state output. The communication interface part transmits and receives the desired data according to a protocol.

Description

Alarm and monitor device of diesel engine status which is enable to measure multi-channel temperature and pressure signal}

The present invention converts various types of thermocouple temperature signals and platinum temperature resistance (PT100) temperature signals into standard signals ranging from 4㎃ to 20㎃ using current output transmitters that are commonly used in industrial fields. Can be received at the same time as the input signal, and the current output signal of the pressure sensor can be received as an input signal directly without conversion process, and the temperature and pressure status values of each channel can be measured simultaneously and displayed on the status display and alarmed by monitoring for abnormal operation. The present invention relates to a cost-effective multi-function condition monitoring and warning device invented to control a ship or onshore diesel engine for more stable operation.

Conventional temperature measuring devices and pressure measuring devices are thermocouple temperature sensors using thermoelectric power signals generated by the SEEBECK EFFECT principle by joining two kinds of metal tips of different materials as shown in FIG. It is a temperature measuring system (registered patent 10-0332835) that can be used in a multi-channel by using all seven kinds of sensors defined in the standard, that is, B, R, S, K, E, J, and T type, or are commonly used in industrial fields. There is a temperature measuring device that can receive only the most commonly used K-type thermocouple as a multi-channel input signal. In addition, there is a temperature measuring device that can exclusively receive a platinum resistance thermometer (PT100) signal having the best linearity of the output signal with respect to temperature among temperature sensors. In addition, pressure-only measuring devices that display only the pressure state value by receiving the output signal of the pressure sensor 4㎃ ~ 20㎃ as an input are widely used.

However, the above-described prior art devices can accept only certain types of sensors, such as thermocouples or platinum resistance thermometers (PT100) and pressure sensors, or as B, R, S, K, E, J, T, etc. Different types of sensors can be used interchangeably, but they have limitations that ensure flexibility only within the limited sensor range of thermocouples. In addition, in the case of a device for monitoring the multi-channel status value, there is no status display unit to check the status value in the device (registered patent 10-0332835), and there is an inconvenience that can be confirmed only in a remote PC monitor through communication. Therefore, a technology that can be used in multiple channels by using a temperature sensor and a pressure sensor and a technology that integrates a sensor monitoring device and an alarm output device in multiple channels have not been introduced in the past. Since there are many kinds of temperature measuring device, pressure measuring device and alarm monitoring and output device, there is a high cost burden and there is a problem that the use method is different for each manufacturer. Therefore, the user should be familiar with the various operation methods of each device installed in the system. Had discomfort.

SUMMARY OF THE INVENTION The present invention has been created to solve the problems of the prior art as described above and to compensate for the disadvantages, and an object of the technical problem of a diesel engine condition monitoring and warning device capable of measuring a multi-channel temperature and pressure signal according to the present invention. The present invention provides a device capable of measuring a temperature state value regardless of a pressure state value or a type of sensor that is directly input or inputted through a signal conversion transmitter 20.

Still another object of the present invention is to process the multi-channel signal information consisting only of the current input as a digital input to the data storage unit 70 using the user input unit 110 and the status display unit 80 according to the setting method of FIG. The amount of change corresponding to the change of the input signal based on various parameter setting values such as the sensor type and scale range for each channel is converted according to the signal flow chart of FIG. It is to display and monitor the signal line failure and at the same time to monitor the normal operation abnormality to supply the alarm and SHUT-DOWN output function for each channel (140) to protect the system and provide a stable operation.

It is another object of the present invention to measure the temperature and pressure of the system in the industrial field and to monitor the presence or absence of various temperature and pressure devices as shown in FIG. It is to replace all functions with the device of the system and to provide the convenience of the operation cost reduction and user operation.

In the present invention, all sensor signals related to temperature and pressure are converted into 4 ㎃ to 20 ㎃ current signals directly or through a signal conversion transmitter 20 and received as multi-channel inputs to simultaneously measure the state values to obtain respective temperature and pressure values. Multi-function multi-channel temperature, pressure monitoring and warning device characterized in that it outputs to the status display unit 80 and outputs a warning alarm signal for abnormal operation, such as signal line failure or abnormal high temperature or high pressure abnormality (140) Suggest.

Diesel engine condition monitoring and warning device that can measure the multi-channel temperature and pressure signal according to the present invention can be used in a multi-channel by using a variety of temperature sensors and pressure sensors and protection of the sensor monitoring device and alarm output device, etc. When the proposed device is applied to a facility that requires the use of several types of temperature and pressure sensors to monitor and control a system such as a diesel engine with additional functions, the existing temperature, pressure measuring device, and alarm output device Because of the high cost burden and the different problems of how to use each manufacturer, it is possible to greatly improve the inconvenience that the user needs to know the various operation methods of each device installed in the system, thus providing convenience of the device operation method for the user. Big benefits, such as cost effectiveness and cost savings You can expect.

With reference to the accompanying drawings, preferred embodiments of the present invention for achieving the above object will be described in detail. The diesel engine condition monitoring and warning device capable of measuring the multi-channel temperature and pressure signal according to the present invention is the input signal of the various temperature sensors and pressure sensors 10 is directly input or converted through the signal conversion transmitter 20 Multi-channel input section 30 with over current protect (OCP) circuit that converts current signals from to 20 volts into a measurable range and prevents overcurrent, and 12-bit A / to convert analog signals to digital signals. Filter unit 50 and A / D for configuring the multiplexer 40 to expand the limited number of channel inputs of the D converter 91 to the required number and removing noise components such as high frequency and noise from the sensor detection signal of the selected input channel. In the flow chart of FIG. 4 and the rectifier 60 comprising an OVP (Over Voltage Protect) circuit and a rectifier circuit for blocking negative voltage and overvoltage above a specific voltage according to the input characteristic range of the converter. 4) The user directly converts the sensor detection signal into a digital state output value and displays it on the status display unit 80, and processes the alarm signal output depending on whether there is an error and the user interface function. Even if power is not supplied to the device and the communication interface unit 100 capable of transmitting and receiving desired data according to a predetermined protocol through a communication program of a user input unit 110 and a personal computer (PC) that can operate the device, it must not be lost. The sensor information and alarm setting information and various parameter values of each channel to be input and stored through the microprocessor 90 and the data storage unit 70 and the amount of change of the sensor input from each channel to the output and the temperature, pressure And a status display unit 80 for displaying an alarm character corresponding to an abnormality and displaying it as a quantitative value of If WIRE-BREAK alarm unit 150 and diesel engine sensors are applied to indicate the signal line failure of the sensor input to the channel, the warning alarm and SHUT-DOWN relay output are output when the standard value is exceeded for normal operation and system protection. It is characterized by consisting of the alarm output unit 140 to export.

The plurality of input channel units 30 are OCP (Over Current Protect) to protect the over-current that may be generated by a user's incorrect wiring or short circuit if only a current signal of 4 ㎃ ~ 20 입력 rating is input regardless of the sensor 10 type It is configured to supply a stable signal to the input terminal of the multiplexer 40 by converting the voltage into a measurable range through a circuit.

The multiplexer 40 is configured to sequentially input a plurality of output signals converted by the input channel unit 30 to a 12-bit analog to digital converter included in the microprocessor 90 through an N × 1 multiplexing function. It is. When the embodiment according to the present invention is applied to 10 channels as shown in FIG. 3, two 8 × 1 multiplexers 40 and two A / D converter input channels may be implemented. The number of input channels of the A / D converter 91 in the microprocessor 90 used in the above embodiment is eight, and when combined with the 8 × 1 multiplexer 40, the input channel unit 30 extends up to 64 sensors. Can be configured. In addition, the processing speed is faster and the number of input channels of the built-in A / D converter 91 is also applied to the microprocessor 90 so that when combined with the multiplexer 40, it is configured to provide the scalability to use even more various sensors. It is.

The filter unit 50 has a low pass filter (LPF) circuit, which removes high frequency noise components that are mixed with the sensing signal of the sensor to prevent malfunction due to the noise signal, and passes only the pure sensor sensing signal to provide a precise signal. It is configured to enable the transmission interface.

The rectifier 60 generates an overvoltage or negative voltage outside the normal input voltage range of the microprocessor 90 due to an input channel unit 30 connection error or a signal line failure and a sensor malfunction. In order to prevent the problem of damage is provided with a half-wave rectifier circuit and OVP (Over Voltage Protect) circuit is configured to protect the A / D converter input channel 91 from abnormal input voltage.

As illustrated in FIG. 5, the data storage unit 70 includes information about the types and reference unit information of various sensors 10 connected to the multi-channel input channel unit 30, the minimum value ZEro and the maximum value SPAN, and Various information such as the normal state reference value of each sensor signal for the normal control of the diesel engine applied to the embodiment of the present invention is allocated to each channel using the status display unit 80 and the user input unit 110 according to the setting method of FIG. It is configured to be stored in nonvolatile memory.

The status display unit 80 displays a status value in the form of a number on a flexible numeric display (FND) so as to monitor real-time information of temperature and pressure for each channel, so that the user can easily recognize the status. It automatically adds a function that notifies the FND status display unit 302 by scanning the value to provide convenience for user operation. In addition, as shown in FIG. 6, a character is displayed in a setting process for setting sensor information and various parameters so that a user can more easily set and change a time constant for a system to which the device is applied.

The microprocessor unit 90 is a core part responsible for all the control of the present invention, the type of the sensor 10 connected to the input channel unit 30, the sensing range of the sensor, and the minimum and maximum values of the normal input. Various reference values related to the digital conversion value (SPAN), etc., according to the setting method of FIG. 6, are converted to EEPROM (Electrically Erasable Programmable Read Only Memory) using letters and numbers shown in the switch of the user input unit 110 and the status display unit 80. The input signal recorded and stored in the data storage unit 70 of the non-volatile memory and sensed in real time by the sensor is quantized into digital values by a 12-bit A / D converter provided inside the microprocessor 90 to control the algorithm. The temperature or pressure is converted to the corresponding state value and displayed on the status display unit 80 and compared with the set alarm reference value. It performs a function to export a right alarm output relay (140).

In the signal conversion flow chart of FIG. 5, a detailed example of the process of a channel using a K type 600 ° C thermocouple sensor as an input will be described according to the control flow chart of FIG. The temperature of ℃ is output to the thermoelectric power of 0 ~ 24.902mV and the cold junction temperature compensation through the signal conversion transmitter 20 is input to the input channel unit 30 as a current signal of 4 ~ 20 ~. In this way, the current signal detected in real time by the sensor is measured by the 12-bit A / D converter 91 inside the microprocessor 90 through an over current protect (OCP) circuit and a voltage conversion circuit. The signal is converted into a 0.8V to 4.0V signal within a possible rated voltage range and input through a multiplexer 40 for channel expansion, a filter unit 50 for removing noise, and a rectifier 60 for blocking a fault signal. This voltage signal is the least binary bit, LSB (Least Significant Bit) through a quantization process that performs 12-bit A / D conversion after a sample & hold process in the microprocessor 90 as shown in Equations 1 to 3 below. When the conversion reference value (Vref) is 5V, it is converted into a counter value of 655 to 3278 LSB as in the following equation.

600 ° C, the maximum sensing temperature value MAX of the channel used in the above example, is represented by nnAH (MAX) in FIG. 6, 655 in Equation 2, which is the LSB conversion value of 0 ° C in ZEro value, 3278 of Equation 3, which is an LSB conversion value, is stored in the data storage unit 70 according to a setting method using the user input unit 110 and the state display unit 80. The microprocessor 90 performs A / D conversion sequentially 12 times from channel 1 to channel n as shown in the flowchart of FIG. 4, and converts the temperature sensing signal of the channel to A / D in the converter and converts the ADV (A / D Value) After reading the result value, determine the adequacy of the input signal by checking the sensor open and the sensor burn out. When the sensor is open, no current flows to the input channel section 30, so the input is detected as 0V after the voltage is converted to 0㎃. If so, it is determined that the signal line is broken and operates the relay of the WIRE-BREAK alarm output unit 150. When the sensor signal line is disconnected or disconnected to the signal conversion transmitter 20, the output of the transmitter 20 outputs a current of 26 mA, which is a BURN-OUT signal. The input voltage is out of the rated input voltage range, but the input is limited to 4.7V by the overvoltage protection circuit of the rectifier 60. Therefore, when the quantized value corresponds to 3852 LSB, a WIRE-BREAK alarm output 150 is generated by BURN-OUT. Operate the relay if possible. When the ADV (A / D Value) result value within the normal range that does not correspond to the sensor OPEN and BURN-OUT conditions as described above is measured, the ZEro value of this channel stored in the data storage unit 70 which is a nonvolatile memory ( After reading Equation 2), SPAN value (Equation 3) and MAX (Maximum temperature value), the temperature value detected by the sensor is calculated by the temperature value calculation part of FIG. It will be stored in 12 arrays assigned to each star in order.

As described above, more stable measurement values are obtained by averaging temperature values obtained through twelve identical A / D conversion and calculation processes, and accurate data is obtained through temperature compensation routines related to software filtering and sensory linearity problems. do. The temperature value obtained through this process is compared with the temperature limit value set for the protection of the applied system, and when the excess temperature value is detected, the corresponding alarm relay output and SHUT-DOWN relay output 140 are operated. In addition to the K-type thermocouple applied in the above example, other types of thermocouples and the temperature signal of platinum resistance thermometers such as PT100 provide ± 0.2% accuracy based on the full scale and the same control process for the pressure signal. It is configured to provide control to measure precise pressure state values for BAR or MPa (megapascals).

The communication interface 100 is interfaced with an insulated circuit so as to transmit and receive a control program in accordance with the standard of RS-232, which is a standard protocol, with the microprocessor 90 through a personal computer (PC). By adopting RS-485 MODBUS, a standard protocol that is widely applied, the human machine interface (HMI) monitoring program enables users to change the parameter settings through the user input unit 110 or operate the device for real-time monitoring. It is configured to check the setting value change and sensor detection signal of each channel in remote PC in real time.

The user input unit 110 can be directly manipulated by the user through numbers or letters displayed on the status display unit 80 when the user wants to change various parameter values such as sensor type of each channel according to the setting method flow chart as shown in FIG. 6. If you want to check the real-time status value of the detection sensor connected to each channel directly, select the channel by using UP, DOWN switch of the user input unit 110. It is configured to be.

The alarm output unit 140 and the WIRE-BREAK output unit 150 may include a Frst of VALu set within a minimum (ZEro) or maximum value (SPAN) of a normal operation range among various parameter setting values shown in FIG. 6. If the status value measured by the sensing sensor exceeds the specified limit value using the time constant displayed on the scnd as a reference value, the FAIL LED of the status display unit 80 turns on, and at the same time, the alarm of the corresponding channel and the SHUT-DOWN relay ( 140) is configured to be output. In addition, if a problem such as a sensor signal line failure of the multi-channel input channel unit 30, that is, a short circuit or opening occurs, the WIRE-BREAK relay 150 is outputted along with the OPEN character display and the FAIL LED on the status display unit 80. And when the BURN-OUT signal is input according to the signal line failure of the signal conversion transmitter 20 is configured to output the FAIL character and FAIL LED and WIRE-BREAK relay 150 to the status display unit (80).

1 is a block diagram of an apparatus according to the invention.

2 is a block diagram of a conventional temperature and pressure signal measuring apparatus.

3 is a front view of a device in which an embodiment according to the present invention is applied to 10 channels.

4 is a flowchart of a control program according to the present invention.

5 is a flowchart illustrating a signal conversion flow and alarm setting according to the present invention.

6 is a flowchart of a setting method capable of setting a parameter according to the present invention.

Description of the main symbols in the drawings

11 Thermocouple 12 Platinum resistance thermometer PT100 Pressure sensor

20: signal conversion transmitter

30: sensor input unit with OCP (Over Current Protect)

40: MULTIPLEXER 50: Filter unit composed of LPF (Low Pass Filter)

60: rectifier with OVP (Over Voltage Protect)

70: data storage unit 80: status display unit

90: microprocessor unit 91: 12bit analog to digital converter unit

100: communication interface unit 110: user input unit

120: Personal Computer 130: User

140: alarm and SHUT-DOWN relay output

150: WIRE-BREAK Alarm relay output

201 multichannel thermocouple temperature measuring device

202: multi-channel platinum RTD temperature measuring device

203: pressure measuring device

302: Status display part (FND: Flexible Numeric Display, LED)

303: monitoring and warning display

304: user input unit (selection switch unit)

Claims (3)

Multi-channel temperature and pressure measurement device that can receive all sensor signals related to temperature and pressure directly or through the signal conversion transmitter 20 and receive the 4㎃ ~ 20㎃ current signals through the multi-channel input, and simultaneously measure the temperature and pressure status values. The temperature sensor of claim 1 is not limited to the sensor type, such as the PT100 sensor and the seven types of thermocouple sensors of the JIS standard, and only by inputting a current signal of 4 mA to 20 mA by the signal conversion transmitter 20. Multi-channel temperature measuring device capable of measuring the state value by performing a temperature conversion process suitable for the linearity and precision of each sensor in the microprocessor 90 by a digital control program Alarm for each channel to prevent and cut off abnormal operation such as high temperature and high pressure to monitor the status of signal line failure of multi-channel temperature signal and pressure signal applying the sensors of claim 2 and to protect the system to which WIRE-BREAK alarm output function and device are applied Multi-Channel Temperature, Pressure Monitoring and Warning Outputs with Integrated Output and System SHUT-DOWN Outputs

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