JP3841045B2 - Combustion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a combustion apparatus that performs abnormality response control, and more particularly to an apparatus that accurately determines a failure of an actuator or the like while avoiding a specific runaway of a central processing unit that performs combustion control.
[0002]
[Prior art]
  In the conventional combustion apparatus, the control signal generated by the control means is processed by the control means while processing the detection signals of the temperature sensor and the flow rate sensor provided in each part according to the operation mode and the set value. Combustion control is performed by sending it to an adjusting unit or an actuator such as a flow rate control valve.
  In such a conventional combustion apparatus, a configuration in which digital processing is performed using a CPU (Central Processing Unit) as a control means is adopted, and complicated combustion control is executed according to a program.
[0003]
  By the way, in the conventional combustion apparatus, when the program processing of the CPU runs out of control, normal combustion operation is not performed, and anxiety remains in safety. For this reason, a watchdog timer or the like that monitors program processing runaway is provided to improve safety.
  That is, in the conventional combustion apparatus, for example, a watchdog timer is provided by software or hardware, and the CPU sends an operation signal to the watchdog timer at predetermined intervals by an interrupt process, and the watchdog timer is an operation signal. When the arrival of ceases, it is determined that the program processing of the CPU is out of control and the CPU is reset.
[0004]
  By providing such a watchdog timer by hardware or software, abnormal control accompanying runaway of CPU program processing is prevented, and the safety of the combustion apparatus is improved.
[0005]
  By the way, the runaway of the program processing of the CPU occurs in various forms, and a runaway that cannot be detected by the watchdog timer may occur.
  That is, due to factors such as external noise, a partial runaway may occur that causes the main routine to runaway even though the interrupt processing routine that sends the operation signal to the watchdog timer is executed normally. is there.
[0006]
  In addition, a problem may occur in part of the program processing due to the timing of turning on the power of the combustion apparatus and the timing of the mechanical initial check of the actuator.
  If such a program processing partial runaway or trouble occurs, the CPU cannot detect the runaway or trouble with the watchdog timer even though it does not perform normal signal processing. The combustion operation is continued.
[0007]
  Therefore, the conventional combustion apparatus is provided with an abnormality determining means for determining the occurrence of partial runaway or trouble in the program processing based on the detection signal of the sensor, and when the abnormal state is determined, the combustion operation is temporarily stopped. Anomalous response control was performed to resume combustion operation later. In addition, when the occurrence of an abnormal state reaches a predetermined number of times, an abnormality handling process is performed in which the combustion operation is stopped and an abnormality is notified. In other words, when the conventional combustion apparatus determines an abnormal state, the conventional combustion apparatus performs an abnormality response control in which combustion is simply stopped and restarted.
[0008]
[Problems to be solved by the invention]
  However, as described above, in the conventional combustion apparatus, even if the abnormality is determined by the abnormality determination unit, the combustion operation is only stopped and then restarted, and partial runaway and trouble of the program processing are not released. It was not possible to return to normal combustion operation simply by repeating the abnormal combustion operation.
[0009]
  Moreover, it is extremely difficult to reproduce the abnormal state because some runaway or trouble of the program processing described above is caused by random factors such as noise or power-on timing, and the user complains with the abnormality notification. Even in the case of the problem, the abnormality of the combustion apparatus could not be reproduced and it was often difficult to cope with it.
[0010]
  The present invention has been proposed in view of the above-described circumstances, and an object thereof is to provide a combustion apparatus that performs abnormality response control that accurately reports a failure of an actuator or the like while avoiding a specific runaway or trouble of a CPU. It is said.
[0011]
[Means for Solving the Problems]
  In order to achieve the above object, the present inventors have taken the following technical means.
  In other words, the invention according to claim 1 is directed to the combustion operation by sending the control signal generated by the control means to the actuator while processing the detection signal of the sensor provided in each part according to the operation mode. The control device includes a central processing unit that controls combustion control by program processing, and an abnormality determination unit that determines an abnormality in the operating state based on a detection signal of the sensor. The apparatus is configured to perform abnormality response control that resets itself when an abnormal operation state is determined by the abnormality determination means.
[0012]
  Here, the sensor referred to in the present invention refers to a sensor that outputs an electrical signal according to a change in a detection target, such as a temperature sensor or a flow rate sensor. The actuator referred to in the present invention refers to a device that performs mechanical control in response to an electric signal, and controls a proportional control valve, open / close control valve, or air supply that controls a flow path through which fuel, hot water, or air flows. Includes a blower to perform.
[0013]
  Possible causes of an abnormal operation state in the combustion apparatus are a failure of an actuator or a sensor provided in the combustion apparatus and a program processing runaway in the central processing unit.
  Here, the program processing runaway of the central processing unit may occur due to a so-called bit drop in which the data of the program counter indicating the storage address of the processing program changes due to factors such as noise. In addition, stack registers for loading branch addresses to subroutines and interrupt processing routines, various accumulators and registers used for arithmetic processing, flags, and other data, or data stored in external memory changes due to noise ( Bit control), and the control processing of the central processing unit may run away from the intended control.
[0014]
  When the program processing of the central processing unit runs out of control, in general, all processing including interrupt processing and subroutine processing run out of control and the program processing stops, or the program processing often goes infinitely in a loop.
[0015]
  Also, unlike complete program processing runaway, partial runaway in which only specific interrupt processing routines and specific subroutines are executed normally, despite the fact that the main routine of program processing has runaway. May occur.
  As described above, the reason why such a partial runaway occurs in the program processing is that the program counter, the register in the central processing unit, the data in the external memory fluctuates due to external noise or the like.
[0016]
  Further, unlike the partial runaway of such program processing, there is a rare case where the program processing may be hindered at the initial check of the actuator at the start of energization of the combustion apparatus. In other words, in the initial process of detecting the mechanical position of the actuator with a sensor, A / D conversion (analog / digital conversion) of the detection signal into the central processing unit and executing the program processing, Due to the difference between the detection signal that fluctuates at the mechanical initial position of the actuator and the processing start timing of the central processing unit, program processing may be extremely rarely affected.
[0017]
  If such a partial runaway or trouble occurs in the program processing of the central processing unit, the control signal sent from the central processing unit to the actuator will be abnormal, resulting in an abnormal sensor detection signal or sensor detection. As a result of the signal being erroneously taken into the central processing unit, a problem that the output control signal becomes abnormal occurs.
  On the other hand, when the central processing unit is normally performing the program processing, if a failure occurs in the actuator inside the combustion apparatus, the detection signal of the sensor becomes abnormal.
  For this reason, as long as a partial runaway or hindrance of the program processing of the central processing unit can occur, it is an abnormality caused by the program processing of the central processing unit when an abnormal operation state occurs, or the inside of the combustion device It cannot be determined whether the abnormality is caused by the failure of the actuator.
[0018]
  According to the present invention, when the abnormal operation state is determined by the abnormality determining means, the central processing unit performs a process of resetting itself.
  By the reset process, the central processing unit can clear the data such as the program counter and various registers used for the program process and reset the data to reset the runaway state. Therefore, when the abnormality detected by the abnormality determination means is caused by the program processing runaway of the central processing unit, normal combustion operation can be performed by resuming the operation of the combustion device.
[0019]
  In the present invention, after the abnormal operation state is determined by the abnormality determining means, the central processing unit does not ask when to reset itself.
  In other words, for example, when an abnormal operation state is determined by the abnormality determination unit, the central processing unit may adopt a configuration that stops combustion control and resets itself while maintaining the control signal sent to the actuator as it is. it can.
  According to this configuration, when the occurrence of the abnormal operation state is caused by a partial runaway of the program processing of the central processing unit, the combustion operation is restarted to restart the combustion that eliminates the runaway factor. It is possible.
[0020]
  In the present invention, the abnormality response control in the combustion device can be applied to a temperature abnormality of the combustion device, an abnormality in the supply air amount, an abnormality in the fuel supply amount, or the like.
  In the present invention, the abnormality determination means can be configured by using a CPU different from the central processing unit, or can be configured by an electronic circuit.
[0021]
  In the first aspect of the invention, the control means includes a first counter that counts the determination of the abnormal operation state by the abnormality determination means, and the central processing unit is configured to detect when the abnormal operation state is determined. While the first counter is incremented and the count value is stored in the non-volatile memory, when the count value of the first counter reaches a predetermined value, the combustion operation is stopped and abnormality handling processing is performed. ing.
[0022]
  In other words, in the present invention, when an abnormal operation state is determined, the central processing unit stores the operation state data including the operation mode at that time and the count value obtained by incrementing the first counter in the nonvolatile memory. At the same time, the combustion operation is temporarily stopped to reset itself, and the operation state data and the count value stored in the nonvolatile memory are read at the time of restart. Then, the read count value is set in the first counter, and the combustion operation is restarted based on the read operation state data. On the other hand, when the abnormal operation state is determined and the count value reaches a predetermined value when the first counter is incremented, the central processing unit forcibly stops the combustion operation and performs abnormality handling processing such as abnormality notification. .
[0023]
  Therefore, according to the present invention, the abnormality notification is not immediately performed even if the abnormal operation state is determined, and the first The process of resetting the central processing unit for a predetermined number of times set by the counter and reburning is repeated, and if an abnormality still occurs, abnormality handling processing such as abnormality notification is performed. As a result, it is possible to accurately extract abnormalities caused by failures of the actuators of the combustion apparatus and to notify them of abnormalities while eliminating abnormalities caused by noise such as partial runaway of the program processing of the central processing unit. Become.
[0024]
  In the first aspect of the present invention, the control means includes a second counter that counts and sums up the determination of the abnormal operation state by the abnormality determination means, and the central processing unit determines the abnormal operation state. In some cases, the second counter is incremented and the count value is stored in the non-volatile memory. On the other hand, when the count value of the second counter reaches a predetermined value, the combustion operation is performed regardless of the count value of the first counter. Is configured to perform the error handling process.
[0025]
As described above, it is very rare that a program runaway of the program processing of the central processing unit occurs due to noise or the like. Therefore, even if the abnormal operation state is determined and the process of resetting and re-burning the central processing unit is repeated, if the abnormal operation state is not resolved, factors other than program program partial runaway, It is conceivable that an abnormal operation has occurred due to an actuator failure or the like.
According to the present invention, the number of occurrences of the abnormal operation state detected by the abnormality determination means is counted by the second counter, and when the predetermined number of times is reached, the combustion operation is forcibly stopped to notify the abnormality. Perform the error handling process.
[0026]
Thereby, for example, even when an abnormal state or a normal state occurs alternately and the count value of the first counter does not reach a predetermined value, the abnormality notification is performed according to the total number of occurrences of the abnormal state. As a result, it is possible to accurately determine and report an actuator failure or the like latent in the combustion apparatus.
[0027]
  According to a second aspect of the present invention, in the combustion apparatus according to the first aspect, when the central processing unit determines that the abnormal operation state is detected by the abnormality determining unit, the central processing unit performs an abnormality response to reset itself after stopping the combustion operation. It is set as the structure which performs control.
[0028]
  According to the present invention, when an abnormal operation state occurs, the combustion operation is temporarily stopped, and the runaway factor of the central processing unit is canceled by the reset process. Thereby, the safety | security of a combustion apparatus improves. In addition, when the occurrence of an abnormal operation state is caused by a partial runaway of the program processing of the central processing unit, it is possible to resume stable combustion operation by performing the operation of the combustion operation again.
[0029]
  In the combustion apparatus according to claim 1 or 2, the central processing unit does not show the control after resetting itself, but it is desirable that the central processing unit automatically perform re-combustion in the original operation mode.
[0030]
  According to a third aspect of the present invention, combustion is performed by performing a combustion operation by processing a detection signal of a sensor provided in each part by a control unit according to an operation mode, and sending a control signal generated by the control unit to an actuator. The control means includes a central processing unit that supervises combustion control by program processing, and also includes abnormality determination means for determining abnormality of the operation state based on a detection signal of the sensor, and combustion operation including an operation mode. The central processing unit sequentially stores the operation state data in the memory during the combustion operation, and when the operation abnormality state is determined by the abnormality determination unit, After stopping the combustion operation, reset itself and read the operation status data including the operation mode stored in the memory when restarting. It has a structure in which an abnormality handling control to resume the combustion operation in the same operating conditions and prior to the occurrence of the condition.
[0031]
  Here, the operation state data referred to in the present invention includes these operation modes when the combustion apparatus has functions such as a hot water supply operation, a heating operation, a bath dropping operation, and a reheating operation. Further, it may be data including a temperature set in each operation mode, a control signal during combustion operation, and a sensor detection signal.
  The memory referred to in the present invention refers to all types of memory in which data is not lost even when the central processing unit is reset and restarted.
[0032]
  According to the present invention, the central processing unit sequentially stores the operation state data including the operation mode in the memory during the combustion operation. When an abnormal operation state occurs during the combustion operation, the memory stores the operation state immediately before the occurrence of the abnormal operation state. Then, the central processing unit temporarily stops the combustion operation and resets itself. As a result, data such as various registers and program counters used for executing the program processing are once cleared and re-initialized, and the runaway state is released. The central processing unit then restarts the combustion operation in the original operation mode (operation state) with reference to the operation state data including the operation mode stored in the memory at the same time as the restart.
  Therefore, when the abnormality detected by the abnormality determination means is caused by runaway or trouble in the program processing of the central processing unit, the combustion operation is automatically performed in the original operation mode (operation state) after completely eliminating the cause of runaway. Thus, the combustion operation can be continued while avoiding a specific runaway of the program processing of the central processing unit.
[0033]
  In this invention, the timing which memorize | stores driving | running state data in a memory can be set suitably. For example, the central processing unit samples each time the operation state data to be referred to changes during the combustion operation and stores it in the memory, and stores the operation state data in the memory after the abnormal operation state is determined. The structure which stops can be taken.
  In addition, the central processing unit samples the operating state data by interrupt processing at predetermined intervals during the combustion operation and stores it in the memory, and stores the operating state data in the memory after the abnormal operating state is determined. It is also possible to adopt a configuration for stopping the memory.
[0034]
  In this invention, the structure which memorize | stores operation state data, such as an operation mode, in memory is employ | adopted. Therefore, it is possible to reliably store the operation state data such as the operation mode by performing a program process in which the stored data is not cleared at the time of resetting or restarting the central processing unit.
[0035]
  Also in the present invention, abnormality response control in the combustion apparatus can be applied to temperature abnormality, supply air amount abnormality, fuel supply amount abnormality, and the like.
  Further, the abnormality determination means can be configured by using a CPU different from the central processing unit, and can also be configured by an electronic circuit.
[0036]
  In the invention according to claim 3, the control means includes a first counter that counts the determination of the abnormal operation state by the abnormality determination means, and the central processing unit is configured to detect when the abnormal operation state is determined. While the first counter is incremented and the count value is stored in the non-volatile memory, when the count value of the first counter reaches a predetermined value, the combustion operation is stopped and abnormality handling processing is performed. ing.
[0037]
  In other words, in the present invention, when an abnormal operation state is determined, the central processing unit stores the operation state data including the operation mode at that time and the count value obtained by incrementing the first counter in the nonvolatile memory. At the same time, the combustion operation is temporarily stopped to reset itself, and the operation state data and the count value stored in the nonvolatile memory are read at the time of restart. Then, the read count value is set in the first counter and based on the read operation state data. Then restart the combustion operation. On the other hand, when the abnormal operation state is determined and the count value reaches a predetermined value when the first counter is incremented, the central processing unit forcibly stops the combustion operation and performs abnormality handling processing such as abnormality notification. .
[0038]
  Therefore, according to the present invention, even if an abnormal operation state is determined, the abnormality notification is not immediately performed, and the process of resetting and reburning the central processing unit a predetermined number of times set by the first counter is repeated. When this occurs, abnormality handling processing such as abnormality notification is performed. As a result, it is possible to accurately extract abnormalities caused by failures of the actuators of the combustion apparatus and to notify them of abnormalities while eliminating abnormalities caused by noise such as partial runaway of the program processing of the central processing unit. Become.
[0039]
  In a third aspect of the present invention, the control means includes a second counter that counts and sums up the determination of the abnormal operation state by the abnormality determination means, and the central processing unit detects the abnormal operation state. In some cases, the second counter is incremented and the count value is stored in the non-volatile memory. On the other hand, when the count value of the second counter reaches a predetermined value, the combustion operation is performed regardless of the count value of the first counter. Is configured to perform the error handling process.
[0040]
As described above, it is very rare that a program runaway of the program processing of the central processing unit occurs due to noise or the like. Therefore, even if the abnormal operation state is determined and the process of resetting and re-burning the central processing unit is repeated, if the abnormal operation state is not resolved, factors other than program program partial runaway, It is conceivable that an abnormal operation has occurred due to an actuator failure or the like.
According to the present invention, the number of occurrences of the abnormal operation state detected by the abnormality determination means is counted by the second counter, and when the predetermined number of times is reached, the combustion operation is forcibly stopped to notify the abnormality. Perform the error handling process.
[0041]
Thereby, for example, even when an abnormal state or a normal state occurs alternately and the count value of the first counter does not reach a predetermined value, the abnormality notification is performed according to the total number of occurrences of the abnormal state. As a result, it is possible to accurately determine and report an actuator failure or the like latent in the combustion apparatus.
[0042]
  According to a fourth aspect of the present invention, in the third aspect of the present invention, the memory for storing the operation state data is a nonvolatile memory.
  By using a non-volatile memory as the memory, it is possible to reliably store and hold the operating state data even in the event of interruption of energization, and the combustion operation is performed in the same operating state as before the occurrence of the abnormal operating state Can be resumed.
[0043]
  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the central processing unit determines the abnormal operation state by the abnormality determination means, and restarts the combustion control by its own reset processing. After that, the first counter is decremented or reset when the abnormal operation means does not determine the abnormal operation state for a predetermined time.
[0044]
According to the present invention, it is possible to effectively eliminate abnormality notification due to a case in which an abnormal operation state rarely occurs, such as partial runaway of program processing of the central processing unit due to noise or the like. .
[0045]
The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein at least one of the first counter and the second counter is performed by program processing of a central processing unit. The central processing unit reads the count value stored in the non-volatile memory, increments or decrements it, and then calculates the count value. It is configured to store in a non-volatile memory.
[0046]
According to the present invention, the central processing unit can be used without separately providing the first counter and the second counter, and the configuration can be simplified.
Further, the count-up values of the first counter and the second counter can be changed simply by changing the program, and the design can be flexibly dealt with.
[0047]
  Claim7The invention described in claims 1 to6In the invention described in any one of the above,The abnormality determining means takes in a detection signal of the sensor corresponding to the operation state at every predetermined sampling period, and performs a monitoring process for integrating the difference when the detection signal exceeds a preset threshold value, while the integrated value When the value reaches a predetermined value, the operation is determined to be abnormal.
[0048]
  In the invention according to claim 8, the detection signal of the sensor provided in each part is processed by the control means according to the operation mode, and the control signal generated by the control means is sent to the actuator to perform the combustion operation. A combustion apparatus for performing the control, the control means includes a central processing unit that controls the combustion control by program processing, and an abnormality determination unit that determines an abnormality in the operating state based on a detection signal of the sensor,The abnormality determining means takes in a detection signal of a sensor corresponding to an operation state every predetermined sampling period, and performs a monitoring process of integrating a difference when the detection signal exceeds a preset threshold value, while the integration When the value reaches the predetermined value, it is determined that the operation is abnormalThe central processing unit is configured to perform abnormality response control that resets itself when an abnormal operation state is determined by the abnormality determination unit.
[0049]
  Claims 7 and 8According to the invention, the abnormality determination means integrates the difference between the detection signal of the sensor and the target value, and outputs an abnormality determination signal when the integrated value reaches a predetermined value. As a result, it is possible to accurately determine the abnormal state of the combustion control while eliminating abnormality determination due to transient fluctuations such as the hot water supply temperature and the amount of hot water supply.
  In the present invention, the abnormality determination means can be configured using a CPU different from the central processing unit, or can be configured using an electronic circuit.
[0050]
  In the present invention, for example, a set value that is manually input to the control unit or a value that is offset from the set value by a predetermined value can be used as the target value that takes a difference from the detection signal of the sensor.
  In the present invention, the monitoring process for integrating the difference between the detection signal of the sensor and the target value is preferably performed from a state where the detection signal of the sensor reaches a predetermined range with respect to the target value. This makes it possible to accurately determine an abnormal state while eliminating transient fluctuation factors such as when combustion is started and when combustion is restarted.
  In addition, the sampling period can be appropriately set in consideration of a state to be detected, that is, a state in which a detection target such as a hot water supply temperature or a supply air amount varies during combustion control.
[0051]
  According to the ninth aspect of the present invention, combustion is performed in which a detection signal of a sensor provided in each part is processed by a control unit according to an operation mode, and a control signal generated by the control unit is sent to an actuator to perform a combustion operation. The control means includes a central processing unit that supervises combustion control by program processing, and also includes abnormality determination means for determining abnormality of the operation state based on a detection signal of the sensor, and combustion operation including an operation mode. A non-volatile memory for storing operating state data indicating the state, and the central processing unit sequentially stores the operating state data in the RAM during the combustion operation, while the abnormal determining means determines when the abnormal operating state is determined Stores the operation state data stored in the RAM in the nonvolatile memory, resets itself after temporarily stopping the combustion operation, and is ineffective at restart It reads the operation state data including the operation mode stored in the sexual memory, and is configured to perform an abnormality handling control to resume the combustion operation in the same operating conditions and prior to the occurrence of abnormal operation conditions.
[0052]
In this invention, the timing which memorize | stores driving | running state data in RAM can be set suitably. For example, the central processing unit samples each time the operating state data to be referred to changes during the combustion operation and stores it in the RAM, and stores the operating state data in the RAM after the abnormal operating state is determined. It is possible to adopt a configuration in which the data stored in the RAM is stopped and stored in the nonvolatile memory.
According to this configuration, since the operation state data stored in the RAM is stored in the non-volatile memory, the operation state data can be reliably stored and retained even when energization is interrupted. Further, according to this configuration, since the operation state data during the combustion operation is stored in the RAM, the operation state data can be stored at high speed.
[0053]
The invention according to claim 10 is the invention according to claim 9, wherein the central processing unit temporarily stops the combustion operation and stores it in the RAM when the abnormal operation state is determined by the abnormality determination means. It is configured to reset itself after storing the operation state data in the nonvolatile memory.
The present invention is such that, in the invention of claim 9, the processing for storing the operation state data stored in the RAM in the nonvolatile memory is performed after the combustion operation is stopped, and the same effect as in the invention of claim 9 is provided. Play.
[0054]
According to an eleventh aspect of the present invention, in the invention according to any one of the first to seventh aspects, the abnormality determining means determines the abnormal operation state by performing a program processing of the sensor detection signal in the central processing unit. It is configured to do.
[0055]
According to the present invention, the function of the abnormality determination unit can be executed by programming the detection signal of the sensor with the central processing unit without separately providing the abnormality determination unit, and the configuration can be simplified. is there.
Further, by changing the program, the procedure and contents of the discrimination process can be easily changed, and the design can be flexibly dealt with.
[0056]
  Claim12The invention described in claims 1 to11In the invention described in any one of the above, the control means includes runaway monitoring means that detects the occurrence of a runaway state while monitoring the program processing state of the central processing unit and performs reset processing on the central processing unit. The central processing unit is configured to perform its own reset processing using the reset function of the runaway monitoring means.
[0057]
  In the present invention, the runaway monitoring means can be formed by a watchdog timer or the like. In other words, while the operation signal is periodically output from the central processing unit to the watchdog timer by the timer interrupt process, the central processing unit determines that the central processing unit is out of control by the watchdog timer when the operation signal is interrupted. It is possible to adopt a configuration in which a reset process is performed on. According to this configuration, it is possible to reliably determine the runaway of the program processing of the central processing unit, which is the original function of the watchdog timer, and reset the central processing unit.
[0058]
  On the other hand, it seems that the main routine is running out of control even though the operation signal to the runaway monitoring means (watchdog timer) is periodically output in the state of partial runaway of program processing of the central processing unit. In this state, the runaway cannot be determined by the watchdog timer.
  However, according to the present invention, the abnormality determination means determines the operation abnormal state due to partial runaway of the program processing of the central processing unit, and the central processing unit receives the abnormality determination signal and sends an operation signal to the watchdog timer. By forcibly stopping, it becomes possible to reset itself quickly.
  Accordingly, it is possible to reliably prevent the combustion control from being continued in an abnormal state due to a partial runaway of the program processing while simplifying the configuration using the reset function of the watchdog timer.
[0059]
  Claim13The invention described in claim12In the invention described in the above, the runaway monitoring means is constituted by the program processing of the central processing unit, and the central processing unit monitors its own program processing state by software interrupt processing and responds to itself when a runaway state occurs. The reset process is performed.
[0060]
  According to the present invention, it is possible to configure using a central processing unit without separately providing a runaway monitoring means, and the configuration can be simplified.
  Also in the present invention, it is possible to adopt a watchdog timer configuration that is software-processed by the central processing unit as the runaway monitoring means. According to this configuration, the central processing unit resets itself quickly by receiving the abnormality determination signal of the abnormality determination unit and forcibly stopping the generation of the operation signal of the watchdog timer executed by the software processing itself. It becomes possible to do.
[0061]
DETAILED DESCRIPTION OF THE INVENTION
  Embodiments of the present invention will be described below with reference to the drawings.
  FIG. 1 is a flow path system diagram of a combustion apparatus 1 according to the present embodiment, FIG. 2 is a block configuration diagram of control means for performing combustion control of the combustion apparatus 1, and FIG. 3 is a flowchart showing abnormality response control executed by the control means. FIG. 4 is a time chart showing an abnormality determination process executed by the control means.
  The present invention can be applied to a combustion apparatus having any of the functions of hot water supply, bath dropping, reheating, or heating. However, in order to simplify the description, only the hot water supply function is provided in the present embodiment. It will be described as a combustion apparatus 1 having a configuration provided. In the following description, the central processing unit 11 is referred to as CPU 11.
[0062]
  As shown in FIG. 1, the combustion apparatus 1 of the present embodiment has only a hot water supply function centered on the combustion unit 30, and the sensors and actuators provided in each part of the flow path are the control means shown in FIG. 2. 10 is connected.
  As shown in FIG. 1, the combustion unit 30 includes a heat exchanger 31, a gas burner 32, and an air supply fan 34.
  The gas burner 32 generates a flame (combustion gas) by mixing the gas supplied through the gas flow path 33 and the air supplied from the air supply fan 34 to generate a flame (combustion gas). A gas electromagnetic valve 40 that controls the opening and closing of the path and a gas flow rate control valve 41 that controls the gas supply amount are provided.
[0063]
  The heat exchanger 31 has a structure in which the heat exchange pipe 31a is bent through the thin plate-like heat exchange fins 31b arranged in parallel at a predetermined interval, and heat exchange is performed on the combustion gas generated in the gas burner 32. The heat exchange pipe 31a has a function of exchanging heat with flowing hot water via the fins 31b.
[0064]
  On the other hand, the water supply channel 35 extending from the water tap (not shown) is connected to the upstream side of the heat exchange pipe 31a of the heat exchanger 31 via the water supply channel 36, and the downstream side of the heat exchange pipe 31a is The hot water supply channel 38, the mixing valve 43, and the hot water supply channel 39 are connected to the hot water tap 51. Further, a bypass flow path 37 branched from the water supply flow path 35 is connected to the mixing valve 43.
[0065]
  That is, the water supplied to the heat exchanger 31 through the water supply channels 35 and 36 is heated by the heat exchanger 31, and the heated hot water reaches the mixing valve 43 through the hot water supply channel 38. The water supplied from the water supply channel 35 via the bypass channel 37 reaches the mixing valve 43. A high temperature water and a low temperature water are mixed by the mixing valve 43, and the hot water having an appropriate temperature is supplied to the hot water tap 51 through the hot water supply flow path 39.
[0066]
  The water supply channel 35 is provided with a pressure reducing valve 48 that stabilizes the water supplied from the water tap while reducing the pressure, and a water supply temperature sensor 44 that detects the supplied water temperature. The water supply channel 36 and the bypass channel 37 are provided with check valves 49 and 50 for preventing a reverse flow of the supplied water to the upstream side, respectively. The hot water supply passage 38 is provided with a hot water supply temperature sensor 45 that detects the temperature of the hot water heated by the heat exchanger 31. Further, the hot water supply passage 39 includes a mixing temperature sensor 46 that detects the temperature of hot water mixed by the mixing valve 43, a hot water supply flow rate sensor 47 that detects the flow rate of hot water, and a hot water supply electromagnetic that controls opening and closing of the flow passage by a solenoid. A valve 42 is provided.
[0067]
  In this embodiment, the thermistor is used for the water supply temperature sensor 44, the hot water supply temperature sensor 45, and the mixing temperature sensor 46, but it is also possible to use other temperature detection elements such as a posistor and a semiconductor temperature sensor. These temperature sensors 44 to 46 and the hot water supply flow rate sensor 47 are respectively connected to the control means 10 described later, and are configured to transmit detection signals of the sensors to the control means.
  A mixing valve 43 provided in the hot water supply passage 38 and a gas flow rate control valve 41 provided in the gas passage 33 are proportional control valves driven by a stepping motor, and a hot water supply electromagnetic valve 42 provided in the hot water supply passage 39, The gas electromagnetic valve 40 provided in the gas flow path 33 is an open / close control valve driven by a solenoid. Each of these actuators 40 to 43 is connected to the control means 10 described later, and receives a control signal transmitted from the control means 10 to perform flow rate control or open / close control of each flow path. An air supply fan 34 provided in the combustion unit 30 is also connected to the control means 10, and supplies air to the gas burner 32 in response to a transmitted control signal.
[0068]
  Next, the structure of the control means 10 of the combustion apparatus 1 of this embodiment is demonstrated.
  As shown in FIG. 2, the control means 10 is configured around a CPU (central processing unit) 11 that controls combustion control by program processing, and is provided in setting data of a remote controller 21 provided outside and in each part. While taking in the detection signals of the sensors 44 to 47 and performing program processing according to the operation mode, the generated control signals are sent to the actuators 40 to 43 to perform combustion control.
[0069]
  More specifically, the CPU 11 includes a ROM 17 that stores programs and data necessary for control in advance, and a RAM 18 that stores data during program processing.
  Further, as will be described later, the CPU 11 includes a non-volatile memory 13 that stores operation state data such as an operation mode when an abnormal operation state occurs. In the present embodiment, an EEPROM (Electric Erasable Programmable ROM) is used for the nonvolatile memory 13, and stored data can be retained even when the CPU 11 is reset and restarted.
[0070]
  Further, the control means 10 is provided with a watch dog timer (runaway monitoring means) 14 for monitoring the runaway of the program processing of the CPU 11. The watchdog timer 14 is connected to the CPU 11, and it is determined that the CPU 11 is normally executing the program process during a period in which an operation signal sent from the CPU 11 at a predetermined cycle is received by the timer interrupt process. On the other hand, when the operation signal of the CPU 11 is interrupted, it is determined that the program processing of the CPU 11 is out of control, and the watchdog timer 14 performs an operation of sending a reset signal to the CPU 11. Thereby, the runaway state of the program processing of the CPU 11 is prevented from continuing.
[0071]
  The control means 10 includes two counters, a first counter 15 and a second counter 16. In the present embodiment, the functions of both the first counter 15 and the second counter 16 are constituted by the CPU 11, the ROM 17, and the nonvolatile memory 13. In other words, by executing the program stored in the ROM 17, the count value stored in the nonvolatile memory 13 is read, and the count value obtained by incrementing or decrementing the read count value is stored in the nonvolatile memory 13 again. Thereby, even when the CPU 11 is reset, the functions of the first counter 15 and the second counter 16 capable of holding the count value are realized.
[0072]
  In the present embodiment, the first counter 15 is a counter that has an initial value of 0 and is incremented or decremented by 1 by the CPU 11, and counts up when the count value reaches 3. The second counter 16 has an initial value of 0 and is incremented by 1 by the CPU 11, and performs an operation of counting up when the count value reaches 10.
[0073]
  The control means 10 receives the A / D conversion circuit 20 that converts the analog detection signals transmitted from the sensors 44 to 47 into digital data, and the detection signals of the sensors 44 to 47 converted into digital data. An abnormality determination unit 12 is provided for determining occurrence of an abnormal operation state.
  Furthermore, the control means 10 includes a D / A conversion circuit 19 that converts a digital control signal generated by the program processing into an analog control signal and sends the analog control signal to the actuators 40 to 43.
[0074]
  Here, the abnormality determination unit 12 performs a monitoring process of taking in the detection signals transmitted from the sensors 44 to 47 at a predetermined sampling period and integrating the difference when the detection signals exceed a preset threshold value. Is. When the integral value reaches a predetermined value, it is determined that the operation is abnormal, and an abnormality determination signal is sent to the CPU 11.
[0075]
  More specifically, as shown in FIG. 4A, the abnormality determination unit 12 sets a threshold T1 slightly higher than the set temperature To in advance. In a state where the hot water supply temperature T2 is hunting beyond the set temperature To of the remote controller 21, the hot water supply temperature T2 is set at every predetermined sampling period t1 shown in FIG. 4B as shown in FIG. A difference signal when the threshold value T1 is exceeded is obtained, and the difference signal is sequentially integrated. Then, when the integral value reaches a predetermined value, an operation abnormal state is determined and an operation for sending an abnormality determination signal to the CPU 11 is performed.
[0076]
  Therefore, when the hot water supply temperature T2 is hunted exceeding the set temperature To as shown in FIG. 4A, the abnormality determination unit 12 immediately determines that the operation is abnormal when the hot water supply temperature T2 exceeds the threshold value T1. Instead, by performing the determination while integrating the difference signal, it is possible to accurately determine the abnormal operation state while eliminating the erroneous determination associated with the transient temperature fluctuation of the hot water supply temperature T2.
  In the present embodiment, the abnormality determination unit 12 is provided separately from the CPU 11, but the function of the abnormality determination unit 12 may be executed by the program processing of the CPU 11. Further, the abnormality determination means 12 can be configured using a CPU different from the CPU 11 or an electronic circuit.
[0077]
  Next, the abnormality response control performed in the combustion apparatus 1 will be described with reference to the flowcharts of FIGS.
[0078]
  When energization of the combustion apparatus 1 is started, the CPU 11 performs an initial setting process on the actuators 40 to 43 that require initial setting. In addition, the CPU 11 resets the count values of the first counter 15 and the second counter 16 and performs initial setting for resetting the timer A. (See steps 100 and 101 in FIG. 3).
  Here, the timer A is a timer that measures the time to, and measures the time for decrementing the first counter 15 when the normal hot water supply operation of the combustion apparatus 1 continues, as will be described later. . The timer A is constituted by a program stored in the CPU 11 and the ROM 17.
[0079]
  Subsequently, the CPU 11 waits for a combustion command to be transmitted. When the hot-water tap 51 is opened, hot water flowing through the hot-water supply passage 39 is detected by the hot-water supply flow sensor 47, and this detection signal is transmitted to the CPU 11 as a combustion command signal to start the combustion operation.
  When the combustion operation is started, the CPU 11 sends a control signal to the gas electromagnetic valve 40 and the gas flow rate control valve 41 to supply the fuel gas (using city gas in the present embodiment) to the gas burner 32 and the air supply fan 34. A control signal is sent to supply air to the gas burner 32, and the gas burner 32 generates a mixed gas. Then, the CPU 11 ignites the mixed gas of the gas burner 32 with an ignition device (not shown) and starts combustion (see steps 102 to 104 in FIG. 3 above).
[0080]
  On the other hand, as the hot water tap 51 is opened, the water flowing toward the downstream side of the water supply channels 35 and 36 is heated by the heat exchanger 31 and reaches the mixing valve 43 via the hot water channel 38. A part of the water flowing through the water supply channel 35 reaches the mixing valve 43 through the bypass channel 37. Here, the CPU 11 refers to the detection signals of the water supply temperature sensor 44, the hot water supply temperature sensor 45, and the mixed temperature sensor 46 so that the hot water flowing through the hot water supply passage 39 approaches the set temperature To of the remote controller 21. Then, a control signal is sent to the mixing valve 43 to adjust the mixing ratio of hot water and water. As a result, hot water at the set temperature To is discharged from the hot water tap 51 and the combustion operation is performed.
  During the combustion operation, the CPU 11 executes the processing of steps 102 to 110, and each time the operation state data including the operation mode fluctuates, the CPU 11 sends the data indicating the operation ON state of the hot water supply mode and the set temperature data to the remote controller. 21 is read out and written to the nonvolatile memory 13 as operation state data (see steps 102 to 105 and 108 to 110 in FIG. 3).
[0081]
  When the hot water supply temperature T2 reaches the set temperature To, as shown in FIG. 4A, the abnormality determination unit 12 determines the threshold T1 according to the set temperature To. Then, a monitoring process for acquiring the hot water supply temperature T2 by taking the detection signal of the mixed temperature sensor 46 every sampling period t1 and sequentially integrating the difference signal when the hot water supply temperature T2 exceeds the threshold value T1 is started. That is, as indicated by the wavy line in FIG. 4A, in the normal operation state where the hot water supply temperature T2 is close to the set temperature To, the hot water supply temperature T2 does not exceed the threshold value T1, and the integrated value is maintained at 0. (See steps 102 to 105 and 108 to 110 in FIG. 3).
[0082]
  Here, when the hot water supply operation is normally performed, a partial runaway of the program processing that cannot be detected by the watchdog timer 14 may occur in the CPU 11 due to external noise or the like. Further, in the initial check of the actuators 40 to 43 at the start of energization of the combustion device, the program processing of the CPU 11 may sometimes be hindered.
  When such a partial runaway or trouble of the program processing occurs in the CPU 11, the program processing in the process of taking the detection signal of the mixing temperature sensor 46 into the CPU 11 and generating the control signal to the mixing valve 43 becomes abnormal. Therefore, the control of the mixing valve 43 is abnormal. As a result, as shown in FIG. 4A, the hot water supply temperature T2 hunts greatly with respect to the set temperature To (see step 110 in FIG. 3).
[0083]
  When a state where the hot water supply temperature T2 hunts with respect to the set temperature To as shown in FIG. 4 (a) occurs, the hot water supply temperature T2 processed by the abnormality determination means 12 as shown in FIGS. 4 (b) and 4 (c). When the difference signal exceeds the threshold value T1, the difference signal becomes a positive value and is sequentially integrated. When the integration value exceeds the predetermined value, an abnormality determination signal is sent to the CPU 11 and the process proceeds to step 115. (See steps 110 and 115 in FIG. 3).
[0084]
  Next, the CPU 11 increments each of the first and second counters 15 and 16 by one. And if the count value of the 1st counter 15 is 3, CPU11 will stop combustion and will notify abnormality. If the count value of the second counter 16 is 10, similarly, the CPU 11 stops the combustion and performs abnormality notification (see steps 115 to 117, 119 in FIG. 3).
[0085]
  On the other hand, when the count values of the first and second counters 15 and 16 are less than 3 and less than 10, respectively, the CPU 11 temporarily stops combustion and stops sending operation signals to the watchdog timer 14. To do. Thereby, the CPU 11 receives the reset signal output from the watchdog timer 14 and performs reset processing.
  By resetting the CPU 11, the data in the program counter and various registers are cleared and re-initialized, and the program processing runaway state is canceled (see steps 115 to 118 in FIG. 3 above).
[0086]
  When the program processing is resumed after the CPU 11 is reset, in step 101, the same initial setting as described above is performed. Next, the CPU 11 refers to the nonvolatile memory 13 and reads the operation mode data and the set temperature data as operation state data because the data indicating the operation mode is ON. Then, the timer A starts timing and restarts the combustion operation based on the read operation mode and set temperature (operation state data). At this time, the CPU 11 clears the operation state data, that is, rewrites the operation mode data of the nonvolatile memory 13 to OFF and performs the process of clearing the set temperature data (steps 100 to 102, 111 in FIG. 3). ~ 114).
  Here, in the combustion apparatus 1 of the present embodiment, it takes several seconds until the combustion operation is restarted after the CPU 11 is reset. During this period, combustion is stopped while hot water is being supplied from the hot water tap 51. It becomes. Therefore, although the hot water temperature is temporarily lowered, it is possible to quickly return the hot water temperature to the set temperature by restarting combustion.
[0087]
  The period from when the CPU 11 is reset and the combustion operation is restarted until the timer A times out, that is, when the time to elapses after the CPU 11 is reset, the abnormal determination means 12 does not determine the abnormal operation state. At this time, the CPU 11 decrements the first counter 15 by 1 (see steps 105 to 110 and 102 to 104 in FIG. 3).
  On the other hand, when the abnormality determination means 12 determines again the abnormal operation state after the time to elapses after the CPU 11 is reset, the routine proceeds to step 115 where the same reset process and combustion resumption process of the CPU 11 are performed. (See steps 105, 106, and 108 to 119 in FIG. 3).
[0088]
  As described above, according to the combustion apparatus 1 of the present embodiment, the CPU 11 is reset when an abnormal operation state is determined. Therefore, a partial runaway state of the program processing can be reliably canceled, and stable. It is possible to continue the combustion.
  In addition, since the first counter 15 is provided, it is possible to accurately determine abnormalities in the actuator and the like while eliminating abnormal notifications that are extremely rare, such as partial runaway of program processing, and thus improving the reliability of the combustion apparatus 1. Can be improved.
  Further, by providing the second counter 16, even when the occurrence of an abnormality is extremely rare, an abnormality can be notified when the total number of occurrences of the abnormality reaches a predetermined value, and the reliability of the combustion apparatus 1 is further improved. Is possible.
[0089]
  In the above-described embodiment, the combustion apparatus 1 having only the hot water supply function has been described. However, the present invention is not limited to the hot water supply function, and is applied to a combustion apparatus having a drop or retreat of a bath or a heating function. It is also possible.
[0090]
  In the above embodiment, the operation state data is sequentially stored in the nonvolatile memory 13 during the combustion operation. However, the present invention is not limited to such a configuration. In other words, it is possible to sequentially store the operation state data in the RAM 18 during the combustion operation and save the operation state data stored in the RAM 18 in the nonvolatile memory 13 when an abnormal operation state occurs.
[0091]
  In the above embodiment, the combustion control is restarted after the central processing unit 11 is reset when an abnormal operation state is determined. However, the present invention is not limited to such a configuration. For example, when the abnormal operation state is determined, the central processing unit 11 stops itself after the combustion operation is stopped, or when the abnormal operation state is determined, the central processing unit continues with the combustion operation being continued. It is also possible to adopt a configuration in which 11 resets itself.
[0092]
  In the above-described embodiment, the combustion apparatus 1 for burning city gas is described. However, propane gas or the like may be used, and the combustion apparatus 1 using liquid fuel such as kerosene can also be applied.
  Furthermore, the abnormality response control in the combustion apparatus of the present invention is not limited to the case where a temperature abnormality occurs, but can also be applied in the same manner when an abnormality occurs in the air supply amount or when an abnormality occurs in the flow rate of hot water. is there.
[0093]
  Further, in the embodiment, the runaway monitoring means (watchdog timer) 14 and the abnormality determination means 12 are configured by hardware different from the central processing unit 11, but these are program processing by the central processing unit 11. It is also possible to adopt a configuration for execution.
[0094]
【The invention's effect】
  According to the first and second aspects of the present invention, when an abnormal operation occurs due to a partial runaway or trouble of program processing that occurs in the central processing unit, the runaway state can be reliably canceled. A combustion apparatus with improved reliability can be provided.
  Claim3, 4, 9, 10According to the invention described in the above, when an abnormal operation occurs due to a partial runaway or trouble of program processing that occurs in the central processing unit, after the runaway state is surely canceled, before the occurrence of the abnormal operation Combustion can be automatically restarted in the same operation state, and a combustion device with improved usability and reliability can be provided.
  Claim11According to the invention described in (1), the reliability of the combustion apparatus can be improved while simplifying the configuration.
  Claim7,8According to the invention described in (2), it is possible to accurately determine an operation abnormality while eliminating abnormality determination in a transient operation state, and the reliability of the combustion apparatus is improved.
  Claim1, 3, 5According to the invention described in the above, it is possible to accurately determine an abnormality caused by an actuator failure or the like while excluding an abnormality notification due to an abnormality that rarely occurs, such as a partial runaway of program processing of the central processing unit. Reliability is improved.
  Claim1,3According to the invention described in (4), it is possible to notify the abnormality when the total number of occurrences of the abnormal operation state is large, and the safety and reliability of the combustion apparatus can be further improved.
  Claim6According to the invention described in (1), it is possible to improve the reliability of the combustion device while simplifying the configuration.
  Claims12, 13According to the invention described in (4), the reset processing of the central processing unit can be reliably performed, and the abnormality handling control can be easily performed.
[Brief description of the drawings]
FIG. 1 is a flow path system diagram of a combustion apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a control system of the combustion apparatus according to the embodiment of the present invention.
FIG. 3 is a flowchart showing abnormality response control performed by the combustion apparatus shown in FIGS. 1 and 2;
4 (a) to 4 (c) are time charts showing processing of the abnormality determining means of the combustion apparatus shown in FIGS. 1 and 2. FIG.
[Explanation of symbols]
10 Control means
11 Central processing unit (CPU)
12 Abnormality determination means
13 Nonvolatile memory
14 Runaway monitoring means (watchdog timer)
15 First counter
16 Second counter
40 Actuator (Gas solenoid valve)
41 Actuator (Gas flow control valve)
42 Actuator (hot water solenoid valve)
43 Actuator (mixing valve)
44 Sensor (Water supply temperature sensor)
45 sensor (hot water temperature sensor)
46 sensor (mixed temperature sensor)
47 Sensor (hot water flow rate sensor)

Claims (13)

A combustion apparatus that performs a combustion operation by processing a detection signal of a sensor provided in each part according to an operation mode, and sending a control signal generated by the control means to an actuator, wherein the control means A central processing unit that supervises combustion control by program processing, and an abnormality determination means that determines an abnormality in the operating state based on a detection signal of the sensor,
The central processing unit performs abnormality handling control that resets itself when an abnormal operation state is determined by the abnormality determination unit ,
The control means includes a first counter that counts the determination of the abnormal operation state by the abnormality determination means, and a second counter that counts the total abnormality determination by the abnormality determination means,
The central processing unit increments the first counter and stores the count value in the nonvolatile memory when an abnormal operation state is determined, while the count value of the first counter reaches a predetermined value. , Stop the combustion operation and perform the abnormality response control,
When an abnormal operation state is determined, the second counter is incremented and the count value is stored in the nonvolatile memory. On the other hand, when the count value of the second counter reaches a predetermined value, the first counter A combustion apparatus, wherein the abnormality handling process is performed by stopping the combustion operation regardless of the count value.   2. The combustion apparatus according to claim 1, wherein when the abnormal operation state is determined by the abnormality determination unit, the central processing unit performs abnormality response control for resetting itself after stopping the combustion operation. A combustion apparatus that performs a combustion operation by processing a detection signal of a sensor provided in each part according to an operation mode, and sending a control signal generated by the control means to an actuator, wherein the control means And a central processing unit that supervises combustion control by program processing, and stores abnormality determination means for determining abnormality of the operation state based on the detection signal of the sensor, and operation state data indicating the state of the combustion operation including the operation mode And memory to
The central processing unit sequentially stores the operation state data in the memory during the combustion operation. On the other hand, when the operation abnormality state is determined by the abnormality determination unit, the combustion processing operation is temporarily stopped and then reset itself. The operation state data including the operation mode stored in the memory is read out, and abnormality response control for restarting the combustion operation in the same operation state as before the occurrence of the operation abnormality state is performed .
The control means includes a first counter that counts the determination of the abnormal operation state by the abnormality determination means, and a second counter that counts the total abnormality determination by the abnormality determination means,
The central processing unit increments the first counter and stores the count value in the nonvolatile memory when an abnormal operation state is determined, while the count value of the first counter reaches a predetermined value. , Stop the combustion operation and perform the abnormality response control,
When an abnormal operation state is determined, the second counter is incremented and the count value is stored in the nonvolatile memory. On the other hand, when the count value of the second counter reaches a predetermined value, the first counter A combustion apparatus, wherein the abnormality handling process is performed by stopping the combustion operation regardless of the count value.   The combustion apparatus according to claim 3, wherein the memory for storing the operation state data is a nonvolatile memory. In the central processing unit, when the abnormal operation state is determined by the abnormality determining unit and the combustion control is resumed by its own reset process, the first abnormality processing unit does not determine the abnormal operation state continuously for a predetermined time. combustion device according to any one of claims 1 to 4, characterized in that the counter decrements or resets the. At least one of the first counter and the second counter is configured to be performed by a program process of the central processing unit, and the central processing unit reads a count value stored in the nonvolatile memory. incremented or decremented, after this, the combustion device according to any one of claims 1 to 5, characterized in that stores the count value in the non-volatile memory. The abnormality determining means takes in a detection signal of a sensor corresponding to an operation state every predetermined sampling period, and performs a monitoring process of integrating a difference when the detection signal exceeds a preset threshold value, while the integration The combustion apparatus according to any one of claims 1 to 6, wherein when the value reaches a predetermined value, it is determined that the operation is abnormal. A combustion apparatus that performs a combustion operation by processing a detection signal of a sensor provided in each part according to an operation mode, and sending a control signal generated by the control means to an actuator, wherein the control means A central processing unit that supervises combustion control by program processing, and an abnormality determination means that determines an abnormality in the operating state based on a detection signal of the sensor,
The abnormality determining means takes in a detection signal of a sensor corresponding to an operation state every predetermined sampling period, and performs a monitoring process of integrating a difference when the detection signal exceeds a preset threshold value, while the integration When the value reaches a predetermined value, it is determined that the operation is abnormal .
The said central processing unit performs abnormality response control which resets itself, when a driving | running abnormality state is discriminate | determined by the abnormality discrimination | determination means, The combustion apparatus characterized by the above-mentioned. A combustion apparatus that performs a combustion operation by processing a detection signal of a sensor provided in each part according to an operation mode, and sending a control signal generated by the control means to an actuator, wherein the control means And a central processing unit that supervises combustion control by program processing, and stores abnormality determination means for determining abnormality of the operation state based on the detection signal of the sensor, and operation state data indicating the state of the combustion operation including the operation mode Non-volatile memory
The central processing unit sequentially stores the operation state data in the RAM during the combustion operation, while when the operation abnormality state is determined by the abnormality determination unit, the operation state data stored in the RAM is stored in the nonvolatile memory, After stopping the combustion operation, resets itself, reads the operation state data including the operation mode stored in the non-volatile memory at the time of restart, and restarts the combustion operation in the same operation state as before the occurrence of the abnormal operation state A combustion apparatus characterized by performing abnormality response control. The central processing unit, when an abnormal operation state is determined by the abnormality determining means, temporarily stops the combustion operation, and resets itself after storing the operation state data stored in the RAM in the nonvolatile memory. The combustion apparatus according to claim 9 . The combustion according to any one of claims 1 to 10 , wherein the abnormality determination unit is configured to determine an abnormal operation state by performing program processing on a detection signal of a sensor by the central processing unit. apparatus. The control means includes runaway monitoring means for detecting the occurrence of a runaway state while monitoring the program processing state of the central processing unit and performing a reset process on the central processing unit. The combustion apparatus according to any one of claims 1 to 11 , wherein the resetting process is performed using a reset function of the monitoring means. The runaway monitoring means is constituted by program processing of the central processing unit, and the central processing unit monitors its own program processing state by software interrupt processing and performs reset processing on itself when a runaway state occurs The combustion apparatus according to claim 12 .

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