KR20020032062A - Flame scanner system and method for controlling the same - Google Patents

Abstract

The present invention relates to a flame detection system and a control method thereof, and more particularly, to a flame detection system and a control method for more efficient flame detection. The present invention is to ensure the safety control against the abnormality of the flame and various errors of the system, and in particular, it is possible to inform the user of the error and the current operating state by using the LCD display, and also the operator to the characteristics of the flame inside the boiler And it is characterized in that the signal level can be easily adjusted according to the strength. In particular, the present invention is to detect the burner flame by the flame sensor, to improve the stability and reliability of the burner flame detection by applying a photosensor having a good sensitivity to the blue wavelength of visible light of 400 ~ 580nm. In addition, it characterized in that it comprises an alarm function to inform the time so that the maintenance of the burner and the contamination of the sensor lens can be removed. Therefore, the present invention can obtain the effect that the convenience and safe use of the use is possible.

Description

Flame detection system and control method {Flame scanner system and method for controlling the same}

The present invention relates to a flame detection system and a control method thereof, and more particularly, to a flame detection system and a control method for more efficient flame detection.

The boiler generates ignition by supplying combustion fuel such as gas, coal, oil, etc. according to a user's request, or extinguishes by interrupting the supply of combustion fuel. Boilers that perform such ignition and fire extinguishing are classified into small boilers, such as domestic boilers, and medium and large industrial boilers used in factories and power plants.

Usually, a small boiler can perform a function required by a boiler by detecting only the ignition state or the extinguishing state of a flame generated by supply and interruption of combustion fuel. However, in the case of medium and large industrial boilers, the burner flame is not only determined, but the analog current signal is output in proportion to the intensity of the flame and the flame frequency (flame flicker), so that the burner operates stably and efficiently. It is required to aim for complete combustion.

On the other hand, medium and large industrial boilers, which are equipped with a plurality of burners, it is very important to accurately distinguish the flames of the magnetic burner and the flame of the opposite burners that are at the same height and in a straight line. This means that when the self-burner flame is extinguished, even if the flame of the opposite burner burns in front of the flame sensor to detect the self-burner flame, it must detect that the self-burner flame has been extinguished and stop the fuel supply. Not only does this result in incomplete combustion, but it also creates the risk of the boiler exploding from an oversupply of fuel.

Patent No. 171263 (Invention: Flame Detection Method and Apparatus of Boiler) installs a flame sensor to connect a metal pipe inserted into the boiler through an outer wall of the boiler to convert the detected signal into a constant current output. The flame strength amplifying unit is installed at a remote location, and the flame intensity amplifying unit is configured to display the flame state with an external current indicator installed by a signal obtained through a flame strength analog signal and a flame intensity converter. In addition, the signal passed by the comparator is transmitted as a digital signal to the integrated frequency output unit, and at the same time, a defect display, an L.Set display, and an H.Set display are provided and flashed. By means of the logic circuit, the relay is driven, and the light emitting diode is used to indicate whether the flame is normal.

The patent is capable of accurately identifying the opposite burner flame and the magnetic burner flame facing each other so that the boiler can be operated efficiently and safely by detecting the burner flame in the medium / large industrial boiler, and outputting a 4-20 mA analog signal according to the flame intensity. It is applied to a practical product.

However, the patent, the initial setting by the analog switch, depending on the user's intuition, there was a problem that it is difficult to control the initial setting with the same flame detection conditions for each burner. In addition, it does not have a display device that indicates the cause of various system errors such as failure of the internal electronic components of the amplifier and short circuit of the external connection wire, and does not have a function of alarming that the lens of the sensor is contaminated.

Accordingly, an object of the present invention is to provide a flame detection system and a method of controlling the same, which can reliably detect the abnormality of a flame and various error factors of the system by using a microprocessor, and can perform safe and efficient control.

In addition, another object of the present invention to provide a flame detection system and a control method that can easily adjust the level of the signal according to the characteristics and intensity of the flame.

In addition, another object of the present invention is to provide a flame detection system and a control method for informing the outside that the sensor lens is contaminated.

1 to 3 is a block diagram of a flame detection system according to the present invention,

4 to 8 is a control flowchart of the flame detection system according to the present invention.

Explanation of symbols on the main parts of the drawings

10: sensor 15: current / voltage converter

20: logarithm amplifier 25: signal zero regulator

30: voltage / current converter 35,45: integrator

40: Frequency / voltage converter 50,140,150,160: LED driver

55: flame presence discriminator 60: flame signal generator

65: gain adjustment signal generator 70: square wave converter

75: AND gate 80: system malfunction detection signal generator

85: logic signal generator 90: switch operation signal generator

95: LCD display 100: microprocessor

105,120: Output Driver 110,125: D / A Converter

115,130,195,200: Buffer 135,145,155: Relay driver

165: normal signal generator 170: defect signal generator

175: lens contamination signal generator 180 ~ 190: constant current generator

Flame detection system according to the present invention for achieving the above object, the sensor for detecting the flame generated in the burner; Constant current conversion means for compressing the detected signal of the sensor to a logarithmic current and converting the constant current into constant current; Integrating means for inputting the output of said constant current converting means and converting it into a DC signal; Frequency detecting means for detecting a frequency using an output of said constant current converting means; Switch operation means for outputting a signal strength adjustment signal by a user operation; Control means for amplifying the DC signal of the integrating means by a signal intensity control signal input through the switch operating means to generate a flame intensity signal, and correcting the detected frequency signal to generate a flame frequency signal; LCD display means for displaying the flame intensity signal and the flame frequency signal detected by the control means; Under the control of the control means, it comprises a flashing means for performing an indication of the abnormality of the flame and the system error.

The frequency detecting means of the present invention comprises: flame signal generating means for amplifying a DC signal of the integrating means by a gain ratio applied by the control means; Square wave converting means for converting the output of said flame signal generating means into square waves; And frequency / voltage converting means for converting the output of the square wave converting means into a voltage.

The present invention provides a system malfunction detection signal generating means for detecting a system malfunction based on the output of the amplification means; Logic signal generating means for converting the output of the system malfunction detection signal generating means into a logic signal, characterized in that the output of the logic signal generating means is input to the control means.

The present invention provides lens contamination signal generating means for generating a contamination signal of a lens under the control of the control means; And a relay and a light emitting diode operated by the output of the lens contamination signal generating means.

In addition, the control method of the flame detection system according to the present invention comprises the steps of initializing the system, and setting the mode by the user's operation; Performing a self test to monitor system normal operation; Inputting an analog flame signal detected through the sensor in a normal operating state of the system; Digitally processing the input flame signal and calculating a flame intensity and a flame frequency by adjusting a signal intensity set by a user; Displaying the calculated flame intensity and flame frequency on an LCD display; And outputting the calculated flame intensity and flame frequency to the outside.

In addition, the present invention and the operation of the calculated flame intensity and flame frequency, and detecting whether the flame is normal; And when the flame is abnormal, displaying the cause of the defect on the LCD display.

And the present invention is configured to further include the step of displaying the normal or abnormal flame using the LED element.

The present invention includes the steps of detecting lens contamination when the flame is in a steady state; When the lens is contaminated, it further comprises the step of displaying using the LED element.

The present invention further comprises the step of displaying the cause of the defect on the LCD display by using the LED device, by the self-test, when the system is in an abnormal state.

The calculating of the flame intensity of the present invention includes: subtracting a small change in flame intensity from an input analog flame signal; Calculating an average value by repeatedly inputting the analog flame signal at a predetermined period; Calculating an amplification factor by the signal strength according to the user adjustment; Calculating a flame intensity output value using the calculated average value and the amplification ratio; Comparing the calculated flame strength with a reference value, it comprises a step of determining whether or not normal.

The calculating of the flame frequency signal may include: repeatedly inputting the analog flame signal at a predetermined period to calculate an average value; Calculating a flame frequency output value by correcting the detected average value; And comparing the calculated flame frequency with a low frequency flame frequency and a high frequency flame frequency to determine whether the flame state is steady state, low frequency or high frequency.

And the control method of the flame detection system of the present invention comprises the steps of: inputting an analog flame signal detected through the sensor; Calculating a flame intensity signal and a flame frequency signal having a size set by a user using the input flame signal; Determining whether the flame is normal by calculating an average of the flame intensity signal and the flame frequency signal; Determining a continuous state of the determination step for a set time, and displaying a flame normal state or a flame abnormal state; Detecting lens contamination by using the flame signal; determining a continuous state of the detection step for a set time, and displaying a lens contamination state or a lens normal state.

Hereinafter, a flame detection system and a control method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 is a block diagram of a flame detection system according to the present invention.

First, in the flame detection system of the present invention, the sensor 10 is provided at a position where the flame (visible light) generated by the boiler can be detected. The sensor 10 detects the state of the flame by inserting an optical fiber cable into the flame through the metal pipe inserted into the flame generated by the coal, oil, gas fuel as the combustion fuel through the outer wall of the boiler. . The sensor 10 detects the light focused on the convex lens 10b through the lens protection glass filter 10a through the photodiode PD1.

The photodiode PD1 changes its output in accordance with the intensity of the flame, and thus the intensity of the burner flame is detected. In particular, as the photodiode PD1, it is preferable to apply a photodiode having good sensitivity to a blue wavelength among visible rays of 400 to 580 nm.

The intensity of the flame detected by the sensor 10 is input to the logarithmic amplifier 20 where gain adjustment is performed by the variable resistor VR1. The logarithmic amplifier 20 generates a stabilized signal by logarithmically compressing the flame signal detected through the sensor 10 to 1 v / decade.

The output of the logarithmic amplifier 20 is input to the voltage / current converter 30 for converting into a constant current for long-distance transmission. The voltage / current converter 30 is composed of OP amplifiers OP1 and OP2, a plurality of resistors R2 to R6, a capacitor C1, and a variable resistor VR2. The voltage / current converter 30 converts the detected flame signal into a constant current value that enables remote transmission.

Therefore, the configuration up to the voltage / current converter 30 is installed near the boiler that can detect the flame. The flame signal converted into constant current output from the voltage / current converter 30 is transmitted to the control device side of the flame detection system installed at a long distance through the line L1.

The flame signal transmitted through the line L1 is received by a current / voltage converter 15 composed of a high impedance resistor R7, an OP amplifier OP3, and resistors R8 to R10. . The output of the current / voltage converter 15 is input to the signal zero regulator 25 and the system malfunction detection signal generator 80.

The signal zero adjuster 25 is configured to adjust the output signal to zero when the flame is not detected, so that accurate detection is performed on the detected flame signal. Therefore, after zero adjustment of the signal zero adjuster 25, the flame signal detected in the presence of the flame is bypassed as it is.

The flame signal passing through the signal zero adjuster 25 is converted into a DC signal while passing through the integrators 35 and 45, and the converted DC signal A1 is input to the microprocessor 100 through an output terminal. Lose. Thereafter, the microprocessor 100 performs an operation for calculating the strength of the flame signal using the input flame signal A1.

In addition, the flame signal input to the system malfunction detection signal generator 80 is used as a basic signal for detecting a malfunction of the system. Therefore, the system malfunction detection signal generator 80 detects the state of the line L1, the operation state of the sensor 10, and outputs the detected signal to the logic signal generator 85. The logic signal generator 85 converts the input signal into a logic signal that can be transmitted to the microprocessor 100 and outputs it. The signals P12 to P15 according to the system malfunction detection output from the logic signal generator 85 are input to the microprocessor 100.

The flame signal passing through the signal zero adjuster 25 is input to the flame signal generator 60. The flame signal generator 60 is configured to convert the flame signal input based on the gain value generated by the gain adjustment signal generator 65 according to the gain adjustment values P8 to P11 adjusted by the microprocessor 100 to be described later. The gain is adjusted and output.

The flame signal amplified and output by the flame signal generator 60 is output through the output terminal and simultaneously input to the square wave converter 70. The signal TP1 output from the flame signal generator 60 is provided so that the user can see the state of flame according to the combustion of the fuel of the current boiler when the user uses a device such as an oscilloscope.

The signal input to the square wave converter 70 is converted into a square wave according to a reference value and output, and the square wave signal becomes a first input signal of the AND gate 75.

In addition, the flame signal passed through the signal zero adjuster 25 and integrated in the primary integrator 35 and converted into a DC signal becomes an input signal of the flame discriminator 55. The flame presence discriminator 55 compares an input signal with a reference signal and outputs a determination signal according to the presence or absence of a flame. The output signal of the flame detector 55 is applied as the second input signal of the AND gate 75.

Therefore, the AND gate 75 outputs a signal based on the output signal of the flame presence detector 55 and the output signal of the square wave converter 70, and as a result, outputs a signal with respect to the frequency of the flame signal.

The output of the AND gate 75 is input to the frequency / voltage converter 40 and the LED driver 1 (50). The LED driver 1 50 flashes the light emitting diode LED1 which is a frequency indicator while repeating the on / off operation according to the frequency period, and the frequency / voltage converter 40 is detected through the sensor 10. A voltage signal A2 corresponding to the frequency of the flame signal is output. The output A2 of the frequency / voltage converter 40 is input to the microprocessor 100.

In the above process, the microprocessor 100 inputs a signal A1 and a frequency signal A2 according to the intensity of the flame signal detected through the sensor 10. In addition, logic signals P12 to P15 corresponding to a system malfunction are input. In order to adjust the gain of the detected flame signal, a 4-bit signal P8 to P11 for gain adjustment by a desired value is output to the gain control signal generator 65.

First, the microprocessor 100 inputs logic signals P12 to P15 according to the system malfunction, and is controlled by a program that is set internally to determine whether the convex lens 10b is contaminated or not. Generates a pollution signal. The lens contamination signal is input to the relay driver 3 155 and the LED driver 4 160 through the lens contamination signal generator 175. The relay driver 3 155 drives the relay RY3, and the LED driver 4 160 blinks the light emitting diode LED4.

In addition, when the logic signals P12 to P15 according to the system malfunction are input, the microprocessor 100 determines whether the internal circuit or the like is defective by using a previously set program, and generates a defect signal. The defect signal is input to the relay driver 2 145 and the LED driver 3 150 through the defect signal generator 170. The relay driver 2 145 drives the relay RY2, and the LED driver 3 150 blinks the light emitting diode LED3.

Then, the microprocessor 100 determines whether or not the normal operation according to whether or not the flame is normally generated in the boiler by a program that is internally set, and generates a normal signal. The normal signal is input to the relay driver 1 135 and the LED driver 2 140 through the normal signal generator 165. The relay driver 1 135 drives the relay RY1, and the LED driver 2 140 blinks the light emitting diode LED2.

The microprocessor 100 performs an operation for detecting the intensity of the flame signal repeatedly for a predetermined period by an internal program by using the signal A1 corresponding to the intensity of the flame signal detected by the sensor 10 as a source signal. Perform. The intensity of the detected flame signal is input to the digital / analog converter 1 110 through the output driver 1 105 through the 8-bit output terminals P16 to P23 of the microprocessor 100. The digital / analog converter 1 110 converts an input signal into an analog signal and then outputs a flame strength signal through the buffer 115.

In addition, the microprocessor 100 uses the signal A2 according to the frequency of the flame signal detected through the sensor 10 as a source signal to repeatedly detect a frequency of the flame signal for a predetermined period by an internal program. Perform the action. The frequency of the detected flame signal is input to the digital / analog converter 2 125 through the output driver 2 120 through the 8-bit output terminals P16 to P23 of the microprocessor 100. The digital / analog converter 2 125 converts an input signal into an analog signal and then outputs a flame frequency through the buffer 130.

The output drivers 1 and 2 105 and 120 operate in synchronization with the clock signals P24 and P25 applied by the microprocessor 110.

By the above operation, the signal according to the flame intensity and the signal according to the flame frequency are calculated and output. The signal is input to the constant current generators 180 to 190, as shown in FIG. Are input to various devices. The constant current generator 1 180 is configured to convert the flame intensity signal into a current of 4 to 20 mA, and the constant current generator 2 185 is configured to convert the flame intensity signal into a current of 0 to 1 mA. Generator 3 190 is a configuration for converting the flame frequency into a current of 4 to 20 mA.

An LCD display 95 and a switch operation signal generator 90 are connected to the microprocessor 100. The LCD display 95 is a configuration for informing the user of the state of the flame detected by the sensor 10, whether there is an abnormality, various notification information, etc. as letters or numbers. In addition, the switch operation signal generator 90 is configured to adjust the signal level according to the characteristics and intensity of the flame generated in the boiler, the mode switch for mode switching (MODE SW), the start switch for starting operation (STARTSW) ), A movement switch (NEXT SW) for movement, an up switch (UP SW) and a down switch (DOWN SW) for adjusting the set value up and down. The operation of each switch is input to the microprocessor 100 through the switch operation signal generator 90 and the buffer 195.

The following describes the overall operation of the flame detection system according to the present invention having the above configuration.

4 to 5 are flowcharts illustrating the main operation of the flame detection system according to the present invention, FIG. 6 is a flowchart illustrating operations according to the switch operation, FIG. 7 is a flowchart illustrating operations according to the flame intensity calculation, and FIG. This is a flow chart.

First of all, the present invention is characterized in that all operations are performed under the control of the microprocessor 100. Therefore, the signal that the user adjusts according to the signal strength is also first recognized by the microprocessor 100, and control accordingly is performed.

When power is applied to the system, the microprocessor 100 adjusts the values stored in the internal memory, such as the flame strength calculation value and the flame frequency calculation value, and the operation state of each circuit element to an initial state (step S100). The display state of the LCD display 95 is also initialized (step S103).

After all the systems are returned to the initial state in steps S100 and S103, the microprocessor 100 monitors whether a start key is input (step S106). The start key is input to the microprocessor 100 through the switch operation signal generator 90 by the user selecting the start switch START SW provided outside the system.

Typically, before the start key is input, the user performs a mode setting process of setting the system to a required operating state. Of course, when the operation is desired as it is already set, the start key is input following the step S103, and when the mode setting is required, an interrupt according to the mode setting is performed. That is, when an interrupt according to the mode setting is generated (step S190), the setting contents selected by the user are output to the LCD display 95 (step S193), and the process of storing the set contents in the memory is performed ( Step S196).

The interrupt for setting the mode is shown in FIG. 6, and the operation according to this will be described later in detail.

When the start key is input in step 106 and a command to perform the operation of the system is input, the microprocessor 100 performs initialization for starting the operation of the system (step S109).

The user inputs a signal for detecting whether an error operation of the system is performed prior to the operation of the system (step S112). The signal input in step S112 is a test value for testing whether the system can be operated normally.

In order to test whether the system operates normally in this step, it is performed by various paths. For example, in a state where a flame is not detected through the sensor 10, it is possible to confirm whether the operation is normal by checking whether the intensity signal A1 of the flame signal input is zero. In addition, when the gain control values P8 to P11 are output from the microprocessor 100 in a state where there is no flame, a signal is not output from the flame existence discriminator and thus the frequency signal A2 of the flame signal is zero. This may be performed by confirming the recognition. In addition, the microprocessor 100 may detect the connection state of the external cable and whether the internal circuit elements are normally operated.

That is, whether the system error is detected by the step S112 is a process for detecting defects according to whether the normal operation of each circuit element, whether the sensor is normally operated, the connection state of the line, and the like.

If an error occurs in the system based on the value input in step S112 (step S115), the microprocessor 100 outputs a signal informing of occurrence of a system error (step S136). In addition to the occurrence of the error in step S136, the relay indicating that the flame is in the normal operating state is controlled to the off state (step S137).

The defect signal is generated in the defect signal generator 170 by the system error signal generated in step S136, and the defect signal drives the relay driver 145 and the LED driver 3 150. Therefore, the relay RY2 and the light emitting diode LED3 informing about the defect are turned on.

In addition, the microprocessor 100 determines the generated defect, and displays the cause of the defect in simple letters and numbers on the LCD display 95 (step S154). In step S157, all external output values output from the microprocessor 100 are initialized.

After the process of step S157 is performed, the process returns to before step S106, and after the system rearrangement is performed, it is monitored whether the operation start signal of the system is input again.

After re-performing from step S106 to step S115, if it is determined that the system is in a normal operation state, the flame detection control by the flame signal detected from the sensor 10 is performed while all the circuit elements perform the normal operation. Is done.

The microprocessor 100 inputs the flame intensity signal A1 and the flame frequency signal A2 for the flame signal detected through the sensor 10 (step S118).

The flame intensity signal A1 input in step S118 is detected as follows.

The flame (visible light) generated as the burner operates is collected by an optical lens through a metal pipe inserted into the outer wall of the boiler and an optical fiber cable inserted into the boiler, and then detected by the photodiode PD1. The photodiode PD1 outputs a signal proportional to the detected flame. The signal output from the photodiode PD1 is input to the logarithmic amplifier 20, and the logarithm amplifier 20 converts the input signal into a logarithm and outputs the voltage.

The signal output from the logarithmic amplifier 20 is converted into a constant current value of high impedance so as to be transmitted at a long distance from the voltage / current converter 30 and outputted, and the flame signal converted into the constant current value is transmitted through the line L1. Long distance transmission.

The constant current value thus transmitted is input to the current / voltage converter 15, and the current / voltage converter 15 converts the constant current signal transmitted through the line L1 into a voltage signal.

The signal output from the current / voltage converter 15 is applied to the integrators 35 and 45 through the signal zero regulator 25. The integrator converts the input signal into a DC signal and outputs the DC signal. The output DC signal A1 is input as a flame strength signal of the microprocessor 100.

In addition, the flame frequency signal A2 input in step S118 is detected as follows.

The signal applied to the integrator 35 through the signal zero adjuster 25 is input to the flame presence or absence discriminator 55, and the flame existence or absence discriminator 55 compares the input signal with a reference signal to determine the flame. Outputs the signal according to the presence or absence discrimination.

In addition, the signal passing through the signal zero adjuster 25 is input to the flame signal generator (60).

On the other hand, the microprocessor 100 outputs a signal according to the appropriate gain control values P8 to P11 through the output terminal in order to detect a frequency signal with respect to the detected flame signal. The signal of the gain control value (P8 ~ P11) is converted into a value for gain adjustment of the analog signal through the gain adjustment signal generator 65, in this way the gain of the flame signal input to the flame signal generator 60 The rate is determined.

That is, the flame signal generator 60 adjusts and outputs the gain of the input flame signal at a rate applied by the gain adjustment signal generator 65. The gain-adjusted signal is input to a square wave converter 70.

The square wave converter 70 generates a square wave signal by comparing the input signal with a reference signal, and generates an AND gate according to the square wave signal generated in this way and the flame presence or absence discrimination signal generated by the flame presence discriminator 55. The output signal of 75) is determined.

The output signal of the AND gate 75 is input to the frequency / voltage converter 40, and the frequency / voltage converter 40 outputs a voltage signal with respect to the input frequency. The voltage signal thus output is input to the microprocessor 100 as a value A2 for the frequency of the detected flame signal.

The microprocessor 100 performs flame intensity calculation using the flame strength signal A1 input in step S118 and performs flame frequency calculation using the flame frequency signal A2 (step S121). . In operation S121, an operation is performed by a sub program, which is illustrated in FIGS. 7 and 8. An operation description thereof will be described later in detail.

The flame intensity and flame frequency calculated in step S121 are displayed on the LCD display 95 (step S124).

In addition, the flame intensity calculated in step S121 is input to the digital-to-analog converter 1 (110) through the output driver 1 (105), and the digital-to-analog converter (1 110) converts the input flame strength signal into an analogue. Convert it to a signal and output it externally. Similarly, the flame frequency calculated in step S121 is input to the digital / analog converter 2 125 through the output driver 2 120, and the digital / analog converter 2 125 converts the input flame frequency signal into an analog signal. Is converted to the output to the outside (step S127).

In operation S130, the microprocessor 100 performs a logic operation on the flame intensity signal and the flame frequency signal calculated in operation 121. The step S130 is a process for determining whether the flame is normal or abnormal as an AND operation of the detected flame intensity signal and frequency.

When it is determined that the flame is in an abnormal state by the operation value of step S130 (step S133), the on delay time set in order to reconfirm whether the detected flame is in an abnormal state is released (step Step S139). The on delay time (or off delay time) is a delay time for waiting until the signal detected is stabilized when the flame generated as soon as the burner is operated is irregular and irregularly operated.

In order to check whether the detected flame is in an abnormal state, it is monitored whether the set off delay time has elapsed (step S142), and when the condition of step S142 is satisfied, it is generated according to the normal operation of the flame. The relay signal is blocked (step S145). That is, in step S145, the operation of the relay RY1 is blocked and the light emitting diode LED2 is turned off.

On the other hand, when the condition of step S142 is satisfied, it is determined whether there is a flame detected through the sensor 10 (step S148), and when the program operation is performed in the absence of flame, the program operation is performed according to the ambient temperature. The small change in flame intensity is detected and stored at zero volts output when zero adjustment is completed due to power supply voltage fluctuation and component deviation (step S151).

The error occurrence cause determined in the program operation step is output to the LCD display 95 (step S154), and the external output is initialized (step S157).

However, if the flame is not detected in step S148, it recognizes that another cause of the defect has occurred, and controls to output the message accordingly.

On the other hand, when it is determined that the flame is in the normal state by the operation value of the step S130 (step S133), the off delay time set to check whether the flame detected is an abnormal state is released. (Step S160).

In order to check whether the detected flame is in a normal state, it is monitored whether the set on delay time has elapsed (step S163), and when the condition of step S163 is satisfied, a cause of abnormal operation of the flame Blocking the generated relay signal and at the same time generates a relay signal according to the normal operation of the flame (step S166). That is, in step S166, the relay RY1 is operated, the relay RY2 is turned off, the light emitting diode LED2 is turned on, and the light emitting diode LED3 is turned off.

As such, when the flame is normally detected, the microprocessor 100 performs a process of detecting whether the lens is contaminated.

The sensor 10 detects the flame signal generated by the boiler using the photodiode PD1. Therefore, the photodiode PD1 should detect light as accurately as possible, and installs a lens unit such as the convex lens 10b near the boiler in order to assist this. Therefore, when dust and waste are covered in the lens unit, the detection signal of the sensor 10 is incorrect. In order to solve this problem, it is necessary to detect whether the lens part is contaminated and clean it at a predetermined cycle.

When the flame is normally detected by performing the step S166, it is determined whether the lens is dirty based on the detected signal (step S169). When it is determined in step S169 that the lens is contaminated, it is monitored whether the on delay time for detecting lens contamination has elapsed (step S184). That is, step S184 is a process for checking whether a signal detected through the sensor 10 during the set lens contamination on delay time is continuously detected as a signal indicating that the lens is in a contamination state.

When the signal detected through the sensor 10 in step S184 continues to be detected during the lens contamination on delay time set as a signal indicating the lens contamination state, the microprocessor 100 outputs a signal indicating that the lens contamination state ( Step S187). In the step S187, the lens contamination signal generator 175 outputs a signal for driving the relay driver 3 155 and the LED driver 4 160 by the lens contamination signal, and thus the relay RY3 is driven. The light emitting diode LED4 is turned on.

However, when it is determined in step S169 that the lens is not contaminated, the lens contamination on delay time for determining lens contamination is canceled (step S172), and the process returns to step S112.

Next, an operation process for changing and setting the mode illustrated in FIG. 6 will be described.

Mode key signal generated when the system is initialized by the steps S100 and S103 or when the user selects the mode switch during the normal operation of the system is generated through the microcontroller 90 through the switch operation signal generator 90. When input to step 100 (step S200), the microprocessor 100 recognizes that the user requests an operation according to a mode change, and performs an interrupt for the mode setting process after the operation is performed.

In addition, a mode key and a movement key according to selection of the mode switch MODE SW and the movement switch NEXT SW are input to the microprocessor 100 through the switch operation signal generator 90 to select a mode item for user adjustment. (Step S218 to Step S227).

When the mode item to be adjusted in step S227 is selected, the up key and the down key according to the selection of the up switch UP SW and the down switch DOWN SW are transferred to the microprocessor 100 through the switch operation signal generator 90. ) Is set or decreased according to the set item (steps S230 to S239).

When the setting value according to the selected mode item is adjusted through the above process, the microprocessor 100 outputs the finally set contents to the LCD display 95 (step S242).

Then, when the start key is input according to the selection of the start switch (START SW) for restarting the system by the user (step S245), the setting value set in the process is stored in the internal memory (step S248). The operation for setting the mode ends.

However, if the mode switch MODE SW selected by the user is input again before the start key is input in step S245, the process of adjusting the set value of the selected mode is performed by repeating the above process.

As described above, according to the mode setting and adjustment, the reference value according to the characteristics of the flame, the signal level according to the flame intensity, and whether or not the normal flame is determined is adjusted.

Next, FIG. 7 is a process of calculating the flame strength in the microprocessor 100 using the flame intensity signal A1 of the DC component output through the integrator 45 shown in FIG. 1 as a source signal.

First, the flame intensity signal A1 of the analog component output from the integrator 45 is input (step S300).

The flame intensity signal A1 input in step S300 is converted into a digital signal AD1 by an analog / digital converter in the microprocessor 100 (step S303).

The digital signal AD1 converted in step S303 is a signal including a small amount of flame intensity change detected when zero adjustment is performed. Therefore, the flame intensity minute change is subtracted from the digital signal AD1 to detect the correct flame intensity signal AD11 with respect to the detected flame signal (step S306).

As described above, the detected flame intensity signal AD11 is repeatedly detected a predetermined time (N times) at intervals of a predetermined time, and the average value AD12 of these values is calculated (step S309).

Intensity Gain (IG) is calculated using the average value AD12 calculated in step S309 (step S312), and the amplification factor IG calculated in step S312 and step S309 are obtained. The output value AD13 for outputting to the outside is computed using the calculated average value AD12 (step S315).

The external output value AD13 calculated in the step S315 is outputted and displayed on the LCD display 95 and simultaneously outputted to the outside through the output driver 1 105 and the digital-to-analog converter 1110 (first Step S318).

The external output value AD13 detected in step S318 is compared with a reference value (Intensity Low Fault determination reference value: ILL) for determining whether the flame intensity is normal (step S321).

When the flame intensity is greater than the reference value, the flame intensity is set to normal when the flame intensity is greater than the reference value, and when the flame intensity is smaller than the reference value, the flame intensity is set to be small (steps S324 and S327).

That is, the microprocessor 100 finally recognizes whether the flame strength is small or steady by the steps S324 and S327, and returns to the main program while ending the flame strength calculation.

Next, FIG. 8 is a process of calculating the flame frequency in the microprocessor 100 using the frequency signal A2 output through the frequency / voltage converter 40 shown in FIG. 1 as a source signal.

The frequency signal A2 output through the frequency / voltage converter 40 is input to the microprocessor 100 (step S400). The frequency signal A2 input to the microprocessor 100 is converted into a digital signal AD2 by an internal analog / digital converter (step S403).

As described above, the detected flame frequency signal AD2 is repeatedly detected a predetermined time (N times) at intervals of a predetermined time, and the average value AD21 of these values is calculated (step S406).

Then, the frequency correction is performed on the flame frequency signal AD21 calculated in the step S406 (step S409), and finally the detected flame frequency signal AD22 is output to the outside and simultaneously displayed on the LCD display 95. Output (step S412). The flame frequency signal AD22 output to the outside in step S412 is output to the outside through the output driver 2 120 and the digital / analog converter 2 125.

In addition, it is determined in step S415 whether the flame frequency signal AD22 detected in step S409 is smaller than the value (FLL: flame frequency low fault determination reference value) set as the low frequency determination reference value. If the condition of step S415 is satisfied, a signal indicating that the detected frequency is a low frequency is set (step S418).

However, when the flame frequency signal AD22 detected in the step S409 does not satisfy the condition of the step S415, whether the flame frequency signal AD22 is greater than the value set as the high frequency determination reference value (FHL: the flame frequency high fault determination reference value) is S421. Judge at the stage. If the condition of the step S421 is satisfied, a signal indicating that the detected frequency is a high frequency is set (step S424).

However, when the flame frequency signal AD22 detected in step S409 does not satisfy the condition of step S415 and the condition of step S421 does not satisfy, the detected flame frequency signal AD22 indicates the FLL value. It exists between and the FHL value. Therefore, a signal indicating that the detected flame frequency signal AD22 is a normal frequency is set (step S427).

The above process returns to the main program while ending the calculation according to the determination of the normal frequency, the low frequency, and the high frequency according to the flame frequency signal.

According to the present invention as described above, it is possible to ensure a safe control against the abnormality of the flame and various errors of the system, and in particular, it is possible to inform the user of the error and the current operating state using the LCD display, It can be seen that the basic technical idea is to allow the operator to easily adjust the signal level according to the characteristics and intensity of the flame inside the boiler.

And within the scope of the technical idea of the present invention, of course, various modifications are possible to those skilled in the art.

According to the present invention as described above, it will be appreciated that the following advantages can be provided.

First, the present invention is characterized in that the flame sensor is configured to increase the stability and reliability by applying a photosensor having good sensitivity to the blue wavelength in the visible light of 400 ~ 580 nm in the detection of burner flame.

In addition, the flame detection system according to the present invention, as a self-diagnostic function, it is possible to detect the failure of the internal parts including the disconnection of the cable, so that it can be surely safe control against various errors of the system including the abnormality of the flame It was.

In addition, according to the present invention, by using the LCD display to display the state of the flame and the error state of the system, it is possible to more accurately inform the user of the flame state of the boiler compared to the conventional display only the light emitting diodes It was made.

In addition, the present invention can be expected that the operator can easily adjust the level of the signal according to the characteristics and strength of the internal flame of the boiler through the switch operation, the convenience of use and safe use is also expected.

In addition, the present invention has an alarm function to inform the outside that the lens attached to the sensor is contaminated. In the conventional case, since the time to clean the lens was processed in a batch depending only on the user's intuition, problems such as cleaning the lens that was not contaminated or not cleaning the lens for a long time occurred. Had fallen. However, since the present invention generates an alarm according to the contamination state of the lens, it is possible to efficiently perform maintenance for the cleanness of the lens.

Claims (14)

A sensor for detecting a flame generated in the burner; Constant current conversion means for compressing the detected signal of the sensor to a logarithmic current and converting the constant current into constant current; Integrating means for inputting the output of said constant current converting means and converting it into a DC signal; Frequency detecting means for detecting a frequency using an output of said constant current converting means; Switch operation means for outputting a signal strength adjustment signal by a user operation; Control means for amplifying the DC signal of the integrating means by a signal intensity control signal input through the switch operating means to generate a flame intensity signal, and correcting the detected frequency signal to generate a flame frequency signal; LCD display means for displaying the flame intensity signal and the flame frequency signal detected by the control means; And flashing means for performing an indication of an abnormality of the flame and a system error under the control of the control means. The method of claim 1 wherein: The output of the constant current converting means, the flame detection system, characterized in that for compensating the value according to the fluctuation of the power supply voltage and the component deviation according to the ambient temperature. The method of claim 1 wherein: The frequency detecting means, Flame signal generating means for amplifying the output of said constant current converting means by a gain ratio applied by said control means; Square wave converting means for converting the output of said flame signal generating means into square waves; And a frequency / voltage conversion means for converting the output of the square wave conversion means into a voltage. The method of claim 1 wherein: System malfunction detection signal generation means for detecting a system malfunction based on an output of said amplification means; Logic signal generating means for converting the output of the system malfunction detection signal generating means into a logic signal, And the output of said logic signal generating means is input to said control means. The method of claim 1 wherein: Lens contamination signal generating means for generating a contamination signal of the lens under the control of the control means; And a relay and a light emitting diode operated by the output of the lens contamination signal generating means. The method of claim 1 wherein: The sensor is a flame detection system, characterized in that for use in the visible light having a good sensitivity to the blue wavelength. Initializing the system and setting a mode by a user's operation; Performing a self test to monitor system normal operation; Inputting an analog flame signal detected through the sensor in a normal operating state of the system; Calculating a flame intensity signal and a flame frequency signal having a size set by a user using the input flame signal; Displaying the calculated flame intensity signal and flame frequency signal on an LCD display; And outputting the calculated flame intensity and flame frequency to the outside. The method of claim 7 wherein: Detecting whether the flame is normal by performing an AND operation on the calculated flame intensity and flame frequency; And controlling the cause of the defect on the LCD display when the flame is abnormal. The method of claim 8 wherein: The control method of the flame detection system further comprises the step of displaying the normal or abnormal flame using the LED element. The method of claim 8 wherein: Detecting lens contamination when the flame is steady at this step; When the lens is contaminated, the control method of the flame detection system further comprises the step of displaying by using the LED element. The method of claim 7 wherein: When the system is in an abnormal state by the self-test, the cause of the defect is displayed on the LCD display, the control method of the flame detection system further comprises the step of displaying using the LED element. The method of claim 7 wherein: The step of calculating the flame strength, Subtracting a small change in flame intensity from the input analog flame signal; Calculating the average value by repeatedly inputting the analog flame signal at a predetermined period; Calculating an amplification factor by the signal strength according to the user adjustment; Calculating a flame intensity output value using the calculated average value and the amplification ratio; And comparing the calculated flame strength with a reference value to determine whether the flame is normal. The method of claim 7 wherein: Computing the flame frequency signal, Calculating the average value by repeatedly inputting the analog flame signal at a predetermined period; Calculating a flame frequency output value by correcting the detected average value; And comparing the calculated flame frequency with a low frequency flame frequency and a high frequency flame frequency to determine whether the flame state is steady state, low frequency or high frequency. Inputting an analog flame signal detected through the sensor; Calculating a flame intensity signal and a flame frequency signal of a size set by a user using the input flame signal; Calculating whether the flame is normal by calculating the flame intensity signal and the flame frequency signal; Determining a continuous state of the determination step for a set time, and displaying a flame normal state or a flame abnormal state; Detecting lens contamination using the flame signal; And determining the continuous state of the sensing step and displaying the lens contamination state or the lens normal state for a set time period.