JP2009103358A - Cogeneration system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cogeneration system effective for suppressing wrong determination of right and wrong of a temperature sensor. <P>SOLUTION: This system includes a storage tank 4 storing heating liquid based on waste heat of heat amount produced in power generation of power generation sources 1, 2 and having a group of temperature sensors 9 having a plurality of temperature sensors 91-94 arranged at intervals along the height direction, a liquid discharging portion 6 and a liquid supplying portion 7. A control device 8 includes a first threshold value defining a normal range Tnormal and a second threshold value defining a primary malfunctioning range on at least one of the temperature sensors of the group of temperature sensors 9, and the temperature sensor determines the primary malfunction when a measurement value of the temperature sensor is over the normal range Tnormal and within the primary malfunctioning range. The temperature sensor determines secondary malfunction when the measurement value of the temperature sensor is over the primary malfunctioning range. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a cogeneration system that generates electrical energy by power generation operation of a power generation source and uses waste heat associated with power generation of the power generation source.

  Patent Document 1 discloses a hot water supply system in which hot water in a hot water storage tank is circulated through a hot water supply circulation pipe and supplied to each house. According to this, a technique is disclosed in which a plurality of temperature sensors are provided in a hot water supply circulation pipe, and the automatic operation of the system is stopped when the temperature sensors detect a temperature equal to or lower than a set temperature for system stop. According to this, the hot water storage tank is provided with a plurality of temperature sensors, and when it is determined that one of the temperature sensors is out of order, the measured value of the other temperature sensor is substituted to control the system. .

  Patent Document 2 discloses a system in which hot water produced by a hot water heater is stored in a hot water storage tank via a hot water circulation pipe, and the hot water in the tank is further kept warm by the pipe. According to this, the detected temperature of the incoming water temperature sensor in the water heater is compared with the detected temperature of the thermistor, and if the two are almost the same, the thermistor is determined to be normal.

In Patent Document 3, temperature sensors are provided at the uppermost position and the lowermost position of the hot water tank, and n temperature sensors are connected in parallel at an intermediate position between the two temperature sensors. A cogeneration system is disclosed that connects to an intermediate temperature measuring device of a table. According to this, when the temperature sensor detected by the remaining (n−i) temperature sensors is equal to the cold water temperature, the i temperature sensors among the n temperature sensors at the intermediate position are equal to the injected hot water temperature. The average temperature detected by the temperature sensor at the intermediate position is stored as a reference temperature, and the hot water temperature of each temperature sensor at the intermediate position is estimated from the average temperature detected by the intermediate temperature measuring instrument and the reference temperature.
JP 2001-27448 A JP-A-7-167495 JP 2005-135686 A

  According to the above-described technology, improvement in measurement accuracy of the temperature sensor is expected. However, the water temperature in the storage tank is lowered as a whole in the time zone when a large amount of heated water in the storage tank is used. Moreover, in the time zone when the heated water in the storage tank is not used, the temperature of the water in the storage tank rises as a whole. Due to such influence, in actual operation, there is a possibility that the temperature sensor is determined to be secondary malfunction (for example, failure) exceeding the primary malfunction (for example, abnormal condition) even though the temperature sensor is normal.

  This invention is made | formed in view of the above-mentioned actual condition, and makes it a subject to provide the cogeneration system advantageous in suppressing the misjudgment of the correctness of a temperature sensor.

A cogeneration system according to aspect 1 includes: (i) a power generation source that generates electrical energy by power generation operation and generates thermal energy associated with power generation; and (ii)
A storage chamber for storing a heating liquid heated based on waste heat caused by heat energy generated during power generation of the power generation source, and a plurality of temperature sensors arranged in parallel at intervals along the height direction of the storage chamber A storage tank having a temperature sensor group having: (iii) a discharge part that discharges the heating liquid in the storage chamber of the storage tank to the outside of the storage tank; and (iv) a supply that supplies replenisher to the storage chamber of the storage tank. A liquid portion, and (v) a first threshold value that defines a normal range for a measurement value of at least one temperature sensor in the temperature sensor group, and a primary malfunction range that is wider than the normal range while overlapping with the normal range. A first threshold value, and a first means for determining that the temperature sensor is in a primary malfunction when a measured value of the temperature sensor exceeds a normal range and is in a primary malfunction range; The measured value of the temperature sensor exceeds the primary malfunction range. Rutoki, characterized in that the temperature sensor and a control device and a second means determines that the malfunction of the first-order upset a high secondary disorders.

  Since the cogeneration system generates electrical energy by the power generation operation of the power generation source and uses the waste heat of the thermal energy accompanying the power generation operation of the power generation source, the cost can be reduced. According to aspect 1, when the measured value of the temperature sensor exceeds the normal range and is within the primary malfunction range, the first means determines that the temperature sensor is primary malfunction.

  Further, when the measured value of the temperature sensor exceeds the primary malfunction range, the second means determines that the temperature sensor has a secondary malfunction with a malfunction degree higher than the primary malfunction. For this reason, it is suppressed that the temperature sensor is erroneously determined to be secondary failure due to the movement of the liquid in the storage tank or the like, although the temperature sensor is normal or primary failure. When the temperature sensor is secondary malfunction, the power generation process by the power generation source may be suppressed or stopped.

  According to the cogeneration system according to aspect 2, in the above aspect, when the control device determines that at least one of the temperature sensors is primary malfunctioning, the means for maintaining the power generation operation for the power generation source When the temperature sensor is determined to be secondary malfunction, the power generation operation is stopped for the power generation source, the power generation amount reduction operation, a warning for notifying the secondary malfunction, and the power generation is continued while the power generation is continued. Means for performing at least one of a heat storage operation for storing heat energy of the power generation power in another heat storage unit.

  Although the temperature sensor is normal, it may be determined that the temperature sensor is in primary malfunction. This is presumably due to the influence of the movement of the liquid in the storage chamber of the storage tank when the liquid is taken in and out of the storage tank. Thus, even when it is determined that the temperature sensor is in primary failure, power generation operation is maintained with respect to the power generation source configuring the cogeneration system (before the temperature sensor is determined to be in primary failure). On the other hand, the power generation amount may be maintained, or the power generation amount may be reduced). For this reason, it is suppressed to stop a generating power source one by one, and the cost reduction effect by cogeneration can be acquired.

  Furthermore, when it is determined that the temperature sensor is secondary malfunctioning, the power generation operation is stopped, the power generation amount reduction operation, the secondary warning, and the heat energy of the power generation source are separated from another heat storage unit. Since at least one of the heat storage operations for storing heat is performed, it is possible to suppress the occurrence of defects in the cogeneration.

  Thus, when it is determined that the temperature sensor is in a primary malfunction, a primary warning (for example, a minor warning) can be performed. When it is determined that the temperature sensor is in secondary malfunction, the power generation operation is often stopped for the power generation source, but a secondary warning (for example, a heavy warning) is issued while maintaining the power generation operation for a predetermined time. You may decide to carry out.

  According to the cogeneration system according to aspect 3, in the above aspect, when it is determined that at least one of the temperature sensors is primary malfunction or secondary malfunction, the control device performs power generation operation on the power generation source. Means for performing maintenance, and maintaining the power generation operation when the measured value of the temperature sensor returns to a normal range. Even when it is determined that the temperature sensor is primary malfunction or secondary malfunction, it may be a misjudgment due to the movement of liquid in the storage tank. Therefore, even when it is determined that the temperature sensor is in the primary malfunction or the secondary malfunction, the control device maintains the power generation operation (including the power generation amount reduction) for the power generation source. Then, when the measured value of the temperature sensor returns to the normal range (for example, when the measured value returns to the normal range within a predetermined time after being determined to be malfunctioning), the power generation operation is maintained. According to this, even when it is determined that the temperature sensor is primary malfunction or secondary malfunction, it is not necessary to stop the power generation source one by one. Not a problem. In this case, the energy saving effect by the cogeneration system can be continuously used.

  According to the cogeneration system according to aspect 4, in the above aspect, when it is determined that the temperature sensor is primary malfunction or secondary malfunction, the temperature sensor provided at a position higher than the temperature sensor. And an estimation means for estimating the measured value of the temperature sensor on the basis of an intermediate value between the measured value of the measured value and the measured value of the temperature sensor provided at a position lower than the temperature sensor. Therefore, even if it is determined that the temperature sensor is primary malfunction or secondary malfunction, the amount of heat accumulated in the storage tank can be estimated. The intermediate value is a measured value of a temperature sensor provided at a position higher than the temperature sensor determined to be primary malfunction or secondary malfunction, and a position lower than the temperature sensor. It means an intermediate value between the measured values of the temperature sensor provided. In general, the intermediate value can be an average value, but is not limited to the average value, and an intermediate value in which one of the two temperature sensors arranged at a position sandwiching the temperature sensor is weighted. Value may be used.

  According to the present invention, although the temperature sensor is normal, it is suppressed that it is determined that the secondary malfunction is higher in malfunction than the primary malfunction. Therefore, even when the liquid in the storage tank moves, the possibility of erroneously determining whether the temperature sensor is correct is suppressed.

  The power generation source generates electrical energy by power generation operation and also generates heat energy accompanying power generation. As the power generation source, an engine driven by combustion of fuel (which may be any of gaseous fuel, liquid fuel, and solid fuel) is adopted. However, in some cases, a fuel cell that generates power with an anode fluid and a cathode fluid may be used.

  ・ The storage tank is parallel to the storage chamber that stores the heated liquid that is heated based on the waste heat caused by the heat energy generated during power generation by the power generation source, and is spaced along the height of the storage chamber. And a temperature sensor group having a plurality of temperature sensors. As the heating liquid, heated water is generally used. Examples of water include pure water, tap water, and well water. A known temperature sensor can be adopted as the temperature sensor. The number of temperature sensors is preferably 3 or more, and is exemplified by 4 or more and 5 or more. In addition, when the height of the storage tank is high, the number of temperature sensors tends to increase.

  -A liquid discharge part is for discharging the heating liquid of the storage chamber of a storage tank out of a storage tank. The liquid discharge part can include a discharge pipe that discharges the heating liquid in the storage chamber of the storage tank and an opening / closing part (for example, a valve) that opens and closes the discharge pipe. The liquid supply unit supplies replenisher such as water to the storage chamber when the storage amount of the storage chamber of the storage tank is insufficient. The liquid supply unit can include a supply pipe that supplies liquid to the storage chamber of the storage tank, and an opening / closing part (such as a valve) that opens and closes the supply pipe.

  The control device has a first threshold value that defines the normal range for the measured value (measured temperature) of at least one temperature sensor in the temperature sensor group, and a primary malfunction that overlaps the normal range and is wider than the normal range. The form provided with the 2nd threshold value which prescribes | regulates a range is illustrated. When the measured value of the temperature sensor exceeds the normal range and is within the primary malfunction range, the first means determines that the temperature sensor is primary malfunction. When the measured value of the temperature sensor exceeds the primary malfunction range, the second means determines that the temperature sensor is secondary malfunction. The control device may be a single product or may be divided into a plurality of units.

  -When it is determined that the temperature sensor is in primary failure, the control device is configured to maintain the power generation operation for the power generation source and when the temperature sensor is determined to be in secondary failure. On the other hand, a mode is provided that includes at least one of a power generation operation stop, a power generation amount reduction operation, and a secondary warning (a warning that is heavier than the primary warning). Furthermore, it is good also as the operation | movement which transfers the thermal energy of a generation power source to another thermal storage part (For example, another storage tank etc. which store a heating liquid), and makes it heat-accumulate, continuing electric power generation with a power generation source.

  -When it is determined that the temperature sensor is primary malfunction or secondary malfunction, the control device measures the temperature sensor provided at a position higher than the temperature sensor (for example, the temperature sensor directly above). This temperature is based on an intermediate value (including a simple average value) between the measured value and a measured value of a temperature sensor (for example, a temperature sensor directly below) provided at a position lower than the temperature sensor. The form which has an estimation means which estimates the measured value of a sensor is illustrated. Thereby, even when it is determined that the temperature sensor is primary malfunction or secondary malfunction, the amount of heat stored in the storage tank can be estimated.

The first threshold value is exemplified by a high temperature side first threshold value that defines the high temperature side of the normal range and a low temperature side first threshold value that defines the low temperature side of the normal range. The In this case, the measured value of the i-th temperature sensor from the top (or bottom) is T _i that is arranged at an intermediate position excluding the uppermost temperature sensor and the lowermost temperature sensor in the temperature sensor group. . The measured value of the temperature sensor just above the temperature sensors T _i and T _i-1, the measured value of the temperature sensor just below the temperature sensors T _i and T _{i + 1,} and, the hot side of the measured value T _i temperature sensor When 1 threshold value is T _i HFT and the low temperature side first threshold value is T _i LFT, a form of T _i HFT = T _i−1 + α1 and T _i LFT = T _{i + 1} −α3 is illustrated. Is done. Each threshold means a threshold temperature. α1 and α3 are arbitrary values, can include 0, and are preferably positive values.

As described above, for the measurement value T _i of the i-th temperature sensor from the top (or bottom), the measurement value T _i-1 of the temperature sensor immediately above the temperature sensor and the measurement value of the temperature sensor immediately below the temperature sensor Based on T _{i + 1} , a first threshold value that defines the normal range of the i-th temperature sensor is set. For this reason, when the temperature difference between the upper liquid temperature and the lower liquid temperature in the storage chamber of the storage tank is large, the temperature difference between the measurement value T _i-1 and the measurement value T _{i + 1} becomes large, so that the normal range is determined. There is a tendency for the temperature range to be expanded. Therefore, the first threshold value on the high temperature side and the first threshold value on the low temperature side that define the normal range are automatically relaxed. For this reason, when the temperature difference between the upper liquid temperature and the lower liquid temperature in the storage chamber is large, the temperature sensor is normal even when the water in the storage chamber moves due to the influence of water in and out of the storage chamber. If there is, the probability of being determined as the normal range is increased, and erroneous determination that the primary malfunction or the secondary malfunction is caused is suppressed.

The second threshold value is formed by a high temperature side second threshold value that defines the high temperature side of the primary malfunction range and a low temperature side second threshold value that defines the low temperature side of the primary malfunction range. The form which is shown is illustrated. In this case, when the high temperature side second threshold value for the temperature sensor T _i is T _i HST and the low temperature side second threshold value is T _i LST, T _i HST = T _i−1 + α2, and T _The form which is iLST = Ti _{+ 1- (} alpha) 4 is illustrated. Here, α2 and α4 are arbitrary values (not including 0), and are preferably positive values. As described above, for the measurement value T _i of the i-th temperature sensor from the top (or bottom), the measurement value T _i-1 of the temperature sensor immediately above the temperature sensor and the measurement value of the temperature sensor immediately below the temperature sensor Based on T _{i + 1} , a second threshold value that defines the primary malfunction range of the i-th temperature sensor is set.

For this reason, when the temperature difference between the upper liquid temperature and the lower liquid temperature in the storage chamber of the storage tank is large, the temperature difference between the measurement value T _i-1 and the measurement value T _{i + 1} becomes large, so the primary malfunction range. There is a tendency for the temperature range to be determined to increase. Therefore, the high temperature side second threshold and the low temperature side second threshold that define the boundary between the primary malfunction range and the secondary malfunction range are automatically relaxed. For this reason, even when the water in the storage chamber moves due to the influence of water in and out of the storage chamber and the like, if the temperature sensor is normal, erroneous determination of secondary malfunction is suppressed.

As described above, when the temperature difference between the upper liquid temperature and the lower liquid temperature in the storage chamber of the storage tank is large, the temperature difference between the measurement value T _i-1 and the measurement value T _{i + 1} becomes large. There is a tendency for the temperature range in the normal range to expand. Therefore, the first threshold value on the high temperature side and the first threshold value on the low temperature side that define the normal range are automatically relaxed. In other words, when the entire heating liquid in the storage tank is at a high temperature and the temperature difference between the upper liquid temperature and the lower liquid temperature in the storage chamber of the storage tank is small, the measured value T _i-1 and the measured value T _Since the temperature difference from _{i + 1} is small, the temperature range determined as the normal range tends to be narrow. Accordingly, the first threshold value on the high temperature side and the first threshold value on the low temperature side that define the normal range are tight. In this case, although the temperature sensor is normal, it may be erroneously determined that the primary malfunction or the secondary malfunction has occurred. Therefore, when the heating liquid in the storage tank is not consumed so much for a long time, and the temperature difference between the plurality of temperature sensors spaced apart in the height direction in the temperature sensor group is less than a predetermined temperature, the control device Examples include a mode in which the first threshold value that defines the normal range and / or the second threshold value that defines the primary malfunction range is relaxed in the direction of expanding the normal range and / or the primary malfunction range.

  -When the flow rate per unit time of the liquid flowing through the liquid discharge unit and / or the liquid supply unit exceeds a predetermined flow rate, it is considered that the mobility of the liquid stored in the storage chamber of the storage tank is high. In this case, the movement of the liquid in the storage chamber is larger than normal, and the temperature sensor may be normal, but it may be erroneously determined as a primary malfunction or a secondary malfunction. Then, the following form is illustrated. That is, the form provided with the flow volume detection part which detects the flow volume of the liquid which flows through a liquid discharge part and / or a liquid supply part is illustrated. When the flow rate per unit time detected by the flow rate detection unit exceeds a predetermined flow rate, the control device sets a first threshold value that defines a normal range and / or a second threshold value that defines a primary malfunction range, The normal range and / or the primary malfunction range are relaxed (relaxed compared to when the predetermined flow rate is not exceeded). In this case, when the predetermined time has elapsed or the number of times of measurement exceeds the predetermined number of times, it is estimated that the movement of the liquid in the storage chamber has calmed down. Therefore, the relaxation is released, and the first threshold value and / or the second threshold value are released. The threshold can be restored.

  There is a state in which the temperature difference between a plurality of temperature sensors spaced apart in the height direction in the temperature sensor group exceeds a predetermined temperature. That is, the temperature difference between the plurality of temperature sensors is large, and the difference between the temperature of the upper heating liquid and the temperature of the lower heating liquid among the heating liquids stored in the storage chamber may be large. In this case, when the heating liquid in the storage chamber is discharged from the discharge liquid part or the replenishment liquid is supplied to the storage chamber from the liquid supply part, the relatively lower and higher liquids move in the storage chamber. In spite of normality, there is a risk of being determined to be primary or secondary malfunction. Then, the following form is illustrated. That is, when the temperature difference between a plurality of temperature sensors spaced apart in the height direction in the temperature sensor group exceeds a predetermined temperature, the control device can control the first threshold value and / or the primary malfunction range that defines the normal range. Can be relaxed (relaxed compared to when the temperature does not exceed the predetermined temperature) in the direction of expanding the normal range and / or the primary malfunction range. In this case, if the predetermined time elapses from the reference time or the number of measurements exceeds the predetermined number of times, it is estimated that the movement of the liquid in the storage chamber has calmed down. The value and / or the second threshold can be restored.

(Embodiment 1)
1 to 11 show the first embodiment. As shown in FIG. 1, the system converts an electric energy of the engine 1 and the generator 2 constituting the power generation source and the electric energy of the generator 2 into a direct current to convert the electric power to a power consumption unit 30 (for example, a general household, a business shop, etc.). Converter 3 for supplying electric power, storage tank 4 for storing heated water, water discharge part 6 (liquid discharge part) connected to storage tank 4, water supply part 7 (liquid supply part) connected to storage tank 4, And a control device 8. The generator 2 is driven by the engine 1 to generate electric energy. The engine 1 generates electric energy by driving the generator 2, and generates heat energy at a high temperature. The engine 1 is driven by combustion of fuel (any of gaseous fuel, liquid fuel, and solid fuel).

  The storage tank 4 has a storage chamber 40 that stores heated water (heated liquid) heated based on waste heat caused by thermal energy generated in the engine 1 when the generator 2 generates power. The storage chamber 40 is provided with a water level sensor 49. In a normal state, the water level stored in the storage chamber 40 is above the temperature sensor group 9 and is substantially full.

  A temperature sensor group 9 is arranged in the storage chamber 40. The temperature sensor group 9 includes a first temperature sensor 91, a second temperature sensor 92, and a third temperature that are arranged in parallel along the height direction (depth direction) of the storage chamber 40 at a predetermined interval from the upper side. A sensor 93 and a fourth temperature sensor 94 are provided. The interval is preferably equal, but may not be equal in some cases. Thus, although the number of the temperature sensors which comprise the temperature sensor group 9 is four pieces, it is not limited to this. Five or more may be sufficient.

  The water discharge unit 6 discharges the heated water stored in the storage tank 4 to the heated water consumption unit 5. The water discharger 6 communicates with the upper part of the storage chamber 40 of the storage tank 4, thereby discharging the upper heated water toward the heated water consuming part 5, and a discharge valve ( An opening / closing unit 61 and a pump 62 (conveyance source) are provided. When water can be discharged only by gravity, the pump 62 may be eliminated. The water supply unit 7 replenishes the storage chamber 40 with water when the amount of water in the storage chamber 40 of the storage tank 4 is insufficient. The water supply unit 7 includes a water supply pipe 71 that is connected to a water supply source 79 and supplies water to the lower portion of the storage chamber 40 of the storage tank 4, and a water supply valve 72 (open / close unit) that opens and closes the water supply pipe 71.

  In such a storage chamber 40 of the storage tank 4, in a normal state, the temperature of the heated water tends to be higher on the upper side and lower on the lower side. This is because water is replenished from the water source 79 through the water supply unit 7 from the lower side of the storage chamber 40, and heated water is discharged from the upper side of the storage chamber 40 through the water discharge unit 6. Moreover, it is also the influence by the natural convection of the heating water in the storage chamber 40.

  A first flow rate sensor 75 as a flow rate detection unit that detects the flow rate of water replenished to the storage tank 4 is provided in the water supply unit 7 or the storage tank 4. A second flow rate sensor 65 as a second flow rate detection unit that detects the flow rate of water discharged from the storage tank 4 is provided in the water discharge unit 6 or the storage tank 4. In some cases, the first flow sensor 75 and the second flow sensor 65 may not be provided.

  The control device 8 includes an input processing circuit, a CPU with a time measurement function, an output processing circuit, and a memory (RAM, ROM, etc.). The CPU of the control device 8 commands the fuel supply unit 10 for supplying fuel to the engine 1, the air supply unit 11 for supplying air to the engine 1, the discharge valve 61, the pump 62, the supply valve 72, and the like. Is output through an output processing circuit. The input processing circuit of the control device 8 includes a first temperature sensor 91, a second temperature sensor 92, a third temperature sensor 93, a detection signal from the fourth temperature sensor 94, a signal from the converter 3, the engine 1, and the generator 2, Detection signals from the flow sensors 75 and 65 and a signal from the power consumption unit 30 are input.

  FIG. 2 shows a basic flowchart of the power generation process executed by the control device 8. As shown in FIG. 2, a failure determination process is executed for each temperature sensor 91-94 (step S102). Here, a failure determination flag is set for a sensor determined to be faulty (secondary malfunction). An abnormality flag is set for a sensor that has been determined to have a minor abnormality (primary malfunction) than a secondary malfunction. A normal flag is set for a sensor determined to be normal.

  It is determined whether or not the normal flags of the first temperature sensor 91 to the fourth temperature sensor 94 are set (step S104). If each normal flag is set, all the temperature sensors, that is, the first temperature sensor 91 to the fourth temperature sensor 94 are normal. If the first temperature sensor 91 to the fourth temperature sensor 94 are normal, an accumulation process for accumulating hot water supply load data is executed (step S106). The hot water supply load data is accumulated for a predetermined time (for example, one week) and stored in a predetermined area of the memory.

  Next, based on the hot water supply load data obtained up to the present time, the hot water supply load prediction for that day is performed (step S108). As a result, a time zone in which the amount of heated water used on that day is large is predicted, and the engine 1 is driven based on the prediction. Next, the tank heat quantity estimation process is executed, and the current heat quantity of the heated water stored in the storage tank 4 is estimated based on the detection results of the first temperature sensor 91 to the fourth temperature sensor 94 (step S110). .

  Preparation for determination of the presence or absence of power generation is performed so that the energy saving effect in the cogeneration is improved (step S112). It is determined whether it is better to stop power generation at the present time (step S114). If it is better to stop power generation, power generation stop control is executed (step S116). Specifically, the fuel supply unit 10 and the air supply unit 11 of the engine 1 are controlled to stop the engine 1. If it is not necessary to stop power generation, power generation maintenance control (including the case where the power generation amount is reduced as necessary) is executed (step S118). Thereafter, the process returns to step S102.

  If the result of determination in step S104 is that all of the first temperature sensor 91 to fourth temperature sensor 94 are not normal, a light warning (primary warning) is output to the warning device 85 (step S132). Next, it is determined whether or not the first temperature sensor 91 to the fourth temperature sensor 94 are out of order (secondary malfunction) (step S134). If it is not a failure (secondary malfunction) (Yes in step S134), all of the first temperature sensor 91 to the fourth temperature sensor 94 are not normal, and one of the first temperature sensor 91 to the fourth temperature sensor 94 This corresponds to at least one abnormality (primary malfunction).

  As described above, when at least one of the first temperature sensor 91 to the fourth temperature sensor 94 has a minor abnormality (primary malfunction), it is determined whether or not the measurement value of the temperature sensor can be estimated (step S136). . Here, when it is determined that a plurality of sensors among the first temperature sensor 91 to the fourth temperature sensor 94 are abnormal, it is determined that estimation cannot be performed. If the measured value can be estimated (Yes in step S136), an estimation process for obtaining an estimated value for estimating the measured value of the temperature sensor determined to be abnormal is executed (step S138). Furthermore, it progresses to step S110 and based on the detection result (the estimated value of a measured value is included) of the 1st temperature sensor 91-the 4th temperature sensor 94, a tank calorie | heat amount estimation process is performed and it is stored by the storage tank 4 The current amount of heat from the heated water is estimated (step S110).

  If it is determined in step S136 that the estimation is impossible (No in step S136), it is determined whether it is better to stop the power generation of the system (step S1426). If it is better to stop power generation (Yes in step S142), power generation stop control is executed (step S116). When an abnormality or failure of the temperature sensors 91 to 94 has a great influence on the system, power generation can be stopped.

  If it is not necessary to stop power generation (No in step S142), control (alternative control) for reducing the power generation amount is executed (step S144).

As a result of the determination in step S134, if any of the temperature sensors 91 to 94 has failed (secondary malfunction) (No in step S134), a heavy warning (secondary warning) is output to the warning device 85 (step S140). ). Next, it is determined whether it is better to stop the power generation of the system (step S142). If it is better to stop power generation (Yes in step S142), power generation stop control is executed (step S116).
If it is not necessary to stop power generation (No in step S142), control for reducing the power generation amount is executed (step S144). Specifically, the rotational speed of the engine 1 and / or the generator 2 can be reduced while generating power.

  As described above, according to the present embodiment, even when any one of the temperature sensors 91 to 94 is determined to be abnormal (primary malfunction), the abnormality is not immediately stopped without stopping the power generation operation. When the measured value of the temperature sensor determined to be (primary malfunction) can be estimated (Yes in step S136), the process proceeds to step S110 via step S138, and the control device 8 controls the engine 1 and the power generation. The power generation operation is maintained for the machine 2. When the measured value of the temperature sensor once determined to be primary malfunction returns to the normal range Tnormal, the power generation operation is maintained based on the actual measured value measured by the temperature sensor. As described above, even when at least one of the temperature sensors 91 to 94 is once determined to be abnormal (primary malfunction), the engine 1 and the generator 2 (power generation source) are not stopped. Since it is good, it is not necessary to carry out the startup process of the engine 1 and the generator 2 (power generation source) one by one. Furthermore, the energy saving effect by the cogeneration system can be continuously used, and a cost reduction effect can be obtained. Step S134, step S136, and step S138 are the power generation operation without immediately stopping the power generation operation even when any of the temperature sensors 91 to 94 is determined to be abnormal (primary malfunction). The 1st continuation means to continue is comprised. Step S134, Step S140, and Step S142 are heavy warnings without immediately stopping the power generation operation even when any of the temperature sensors 91 to 94 is determined to be in failure (secondary malfunction). A second continuation unit is configured to continue the power generation operation while performing (secondary warning).

  FIG. 3 shows determination threshold values of the second temperature sensor 92 (a temperature sensor disposed between the first temperature sensor 91 and the third temperature sensor 93). Regarding the measurement value T2 of the second temperature sensor 92, the high-temperature side first threshold value T2HFT (T2HFT = T1 + α21) plus α21 with respect to the measurement value T1 of the upper first temperature sensor 91 and the upper first temperature. A high side second threshold value T2HST (T2HST = T1 + α22) of plus α22 is set with respect to the measured value T1 of the sensor 91.

  Similarly, as shown in FIG. 3, with respect to the measurement value T2 of the second temperature sensor 92, the low-temperature side first threshold value T2LFT (minus α23 with respect to the measurement value T3 of the lower third temperature sensor 93 ( T2LFT = T3-α23), and a low-temperature side second threshold value T2LST (T2LST = T3-α24) of minus α24 is set with respect to the measured value T3 of the lower third temperature sensor 93.

  Here, HFT attached to the high temperature side first threshold value T2HFT means Higher First Threshold. LFT attached to the low temperature side first threshold T2LFT means Lower First Threshold. HST attached to the high temperature side second threshold T2HST means Higher Second Threshold. LST attached to the low temperature side first threshold value T2LST means Lower Second Threshold.

  Here, as can be understood from FIG. 3, when the measured value T2 of the second temperature sensor 92 exists between the high temperature side first threshold value T2HFT and the low temperature side first threshold value T2LFT, the second temperature is detected. The sensor 92 is determined to be in the normal range Tnormal.

  According to the storage tank 4 and the like, the above α21 and α23 are appropriately set as 0 or a positive value. α21 = 0 and α23 = 0 may be used. If α21 = 0 and α23 = 0, T2HFT = T1 and T2LFT = T3, and the measured value T2 of the second temperature sensor 92 is lower than the measured value T1 of the adjacent first temperature sensor 91 above and below. When it exists in the range with measurement value T3 of the adjacent 3rd temperature sensor 93, the 2nd temperature sensor 92 is determined to be the normal range Tnormal.

  As can be understood from FIG. 3, when the measured value T2 of the second temperature sensor 92 is located between the high temperature side first threshold value T2HFT and the high temperature side second threshold value T2HST, the second temperature sensor 92 is It is determined that there is an abnormality (primary malfunction). Furthermore, when the measured value T2 of the second temperature sensor 92 exceeds the high temperature side second threshold value T2HST to the high temperature side, the second temperature sensor 92 is determined to be faulty (secondary malfunction).

  Similarly, as can be understood from FIG. 3, when the measured value T2 of the second temperature sensor 92 exists between the low temperature side first threshold value T2LFT and the low temperature side second threshold value T2LST, the second temperature is detected. The sensor 92 is determined to be abnormal (primary malfunction). Furthermore, when the measured value T2 of the second temperature sensor 92 exceeds the low temperature side second threshold value T2LST to the low temperature side, the second temperature sensor 92 is determined to be faulty (secondary malfunction).

  When the measured value T2 of the second temperature sensor 92 is the actual value of the first threshold value T2HFT, the second threshold value T2HST, the first threshold value T2LFT, and the second threshold value T2LST, the normal range. There is a possibility that it is unclear whether it belongs to Tnormal, an abnormal range, or a failure range. With respect to this point, the threshold values for determining the normal range Tnormal, the abnormal range, and the failure range are distinguished below and below, and priority determination processing is performed. The same applies to the first temperature sensor 91, the third temperature sensor 93, and the fourth temperature sensor 94.

  According to FIG. 3, when the measured value T2 of the second temperature sensor 92 exists between the measured value T1 of the first temperature sensor 91 above it and the measured value T3 of the third temperature sensor 93 below it. The second temperature sensor 92 is determined to be in the normal range Tnormal. For this reason, when the heating water of the storage chamber 40 is discharged moderately and the temperature difference between the upper water temperature and the lower water temperature in the storage chamber 40 is large, the temperature difference between the measurement value T1 and the measurement value T3 increases. There is a tendency that the temperature range determined to be in the normal range Tnormal is expanded. Therefore, the high temperature side first threshold value T1HFT and the low temperature side first threshold value T1LFT that define the normal range Tnormal are relaxed. For this reason, when the temperature difference between the upper water temperature and the lower water temperature in the storage chamber 40 is large, the second temperature is maintained even when the water in the storage chamber 40 moves due to the influence of water in and out of the storage chamber 40. If the sensor 92 is normal, it is determined as the normal range Tnormal, and erroneous determination is suppressed. The same applies to other temperature sensors.

When the heated water in the storage chamber 40 is not consumed for a long time, the entire heated water in the storage chamber 40 becomes high temperature, and the temperature difference between the upper water temperature and the lower water temperature may be reduced. In this case, since the temperature difference between the measured value T1 and the measured value T3 becomes small, the temperature range determined to be within the normal range Tnormal tends to be narrowed. FIG. 4 shows the second temperature sensor 92 and the fourth temperature sensor. 94 shows a determination threshold value of the third temperature sensor 93 arranged between Regarding the measured value T3 of the third temperature sensor 93, a high-temperature side first threshold value T3HFT (T3HFT = T2 + α31) plus α31 with respect to the measured value T2 of the second temperature sensor 92 on the upper side, and the second temperature sensor 92. A high temperature side second threshold value T3HST (T3HST = T2 + α32) of plus α32 is set for the measured value T2.

  Similarly, as shown in FIG. 4, with respect to the measurement value T3 of the third temperature sensor 93, the low-temperature side first threshold value T3LFT (minus α33 with respect to the measurement value T4 of the lower fourth temperature sensor 94 ( T3LFT = T4-α33), and a low-temperature side second threshold value T3LST (T3LST = T4-α34) of minus α34 with respect to the measured value T4 of the lower fourth temperature sensor 94 is set.

  Here, as can be understood from FIG. 4, when the measured value T3 of the third temperature sensor 93 exists between the high temperature side first threshold value T3HFT and the low temperature side first threshold value T3LFT, the third temperature is detected. It is determined that the sensor 93 is normal. According to the storage tank 4 and the like, the above α31 and α33 are set as appropriate. α31 = 0 and α33 = 0 may be used. If α31 = 0 and α33 = 0, T3HFT = T2 and T3LFT = T4. Therefore, when the measured value T3 of the third temperature sensor 93 is within the range of the measured value T2 of the upper second temperature sensor 92 and the measured value T4 of the lower fourth temperature sensor 94, the third temperature sensor 93 is determined to be normal.

  As can be understood from FIG. 4, when the measured value T3 of the third temperature sensor 93 is located between the high temperature side first threshold value T3HFT and the high temperature side second threshold value T3HST, the third temperature sensor 93 is It is determined that there is an abnormality (primary malfunction). Furthermore, when the measured value T3 of the third temperature sensor 93 exceeds the high temperature side second threshold value T3HST to the high temperature side, the third temperature sensor 93 is determined to be faulty (secondary malfunction).

  Similarly, as can be understood from FIG. 4, when the measured value T3 of the third temperature sensor 93 exists between the low temperature side first threshold value T3LFT and the low temperature side second threshold value T3LST, the third temperature is detected. The sensor 93 is determined to be abnormal (primary malfunction). Furthermore, when the measured value T3 of the third temperature sensor 93 exceeds the low temperature side second threshold value T3LST to the low temperature side, the third temperature sensor 93 is determined to be faulty (secondary malfunction).

  FIG. 5 shows determination threshold values of the first temperature sensor 91. As for the measured value T <b> 1 of the first temperature sensor 91, it is assumed that a high temperature side dummy temperature sensor exists in the storage chamber 40 on the upper side. As shown in FIG. 5, with respect to the measured value T1 of the first temperature sensor 91, the high temperature side first threshold value T1HFT (T1HFT = T0 + α11) plus α11 with respect to the measured value T0 of the high temperature side dummy temperature sensor, and the high temperature side A high temperature side second threshold value T1HST (T1HST = T0 + α12) of plus α12 is set with respect to the measured value T0 of the dummy temperature sensor. The measured value T0 of the high temperature side dummy temperature sensor can be set in advance to be as high as γ1 with respect to the actual measured value T1 of the first temperature sensor 91.

  Similarly, as shown in FIG. 5, with respect to the measurement value T1 of the first temperature sensor 91, the low-temperature side first threshold value T1LFT (minus α13 with respect to the measurement value T2 of the second temperature sensor 92 below it. T1LFT = T2−α13), and a low temperature side second threshold value T1LST (T1LST = T2−α14) of minus α14 with respect to the measured value T2 of the second temperature sensor 92 is set.

  Here, as can be understood from FIG. 5, when the measured value T1 of the first temperature sensor 91 exists between the high temperature side first threshold value T1HFT and the low temperature side first threshold value T1HLT, the first temperature is detected. It is determined that the sensor 91 is normal. The above α11 and α13 are appropriately set according to the storage tank 4 and the like. α11 = 0 and α13 = 0 may be used. If α11 = 0 and α13 = 0, the measured value T1 of the first temperature sensor 91 is within the range of the measured value T0 of the high temperature side dummy temperature sensor and the measured value T2 of the lower second temperature sensor 92. When this is done, it is determined that the first temperature sensor 91 is normal.

  As can be understood from FIG. 5, when the measured value T1 of the first temperature sensor 91 is located between the high temperature side first threshold value T1HFT and the high temperature side second threshold value T1HST, the first temperature sensor 91 is It is determined that there is an abnormality (primary malfunction). Furthermore, when the measured value T1 of the first temperature sensor 91 exceeds the high temperature side second threshold value T1HST to the high temperature side, the first temperature sensor 91 is determined to be faulty (secondary malfunction).

  Similarly, as can be understood from FIG. 5, when the measured value T1 of the first temperature sensor 91 exists between the low temperature side first threshold value T1LFT and the low temperature side second threshold value T1LST, the first temperature is detected. The sensor 91 is determined to be abnormal (primary malfunction). Furthermore, when the measured value T1 of the first temperature sensor 91 exceeds the low temperature side second threshold value T1LST to the low temperature side, the first temperature sensor 91 is determined to be out of order (secondary malfunction).

  FIG. 6 shows the determination threshold value of the fourth temperature sensor 94. As for the measured value T4 of the fourth temperature sensor 94, as shown in FIG. 5, the high temperature side first threshold value T4HFT (T4HFT = T3 + α41) plus α41 with respect to the measured value T3 of the third temperature sensor 93 on the upper side. Then, a high temperature side second threshold value T4HST (T4HST = T3 + α42) of plus α42 is set with respect to the measured value T3 of the upper third temperature sensor 93.

  Similarly, it is assumed that the low temperature side dummy temperature sensor exists in the storage chamber 40 below the fourth temperature sensor 94. As shown in FIG. 6, the measured value T4 of the fourth temperature sensor 94 is a low-temperature side first threshold value T4LFT (T4LFT = T5-α43) that is minus α43 with respect to the measured value T5 of the low-temperature side dummy temperature sensor. Then, a low-temperature side second threshold value T4LST (T4LST = T5-α44) of minus α44 is set with respect to the measured value T5 of the low-temperature side dummy temperature sensor. Note that the measurement value T5 of the low temperature side dummy temperature sensor can be set in advance to be as low as γ2 relative to the actual measurement value T4 of the fourth temperature sensor 94.

  Here, as can be understood from FIG. 6, when the measured value T4 of the fourth temperature sensor 94 exists between the high temperature side first threshold value T4HFT and the low temperature side first threshold value T4LFT, the fourth temperature is detected. It is determined that the sensor 94 is normal. According to the storage tank 4 and the like, α41 and α43 described above are set as appropriate. α41 = 0 and α43 = 0 may be used. If α41 = 0 and α43 = 0, the measured value T4 of the fourth temperature sensor 94 is within the range of the measured value T5 of the low-temperature dummy temperature sensor and the measured value T3 of the upper third temperature sensor 93. In doing so, the fourth temperature sensor 94 is determined to be normal.

  As can be understood from FIG. 6, when the measured value T4 of the fourth temperature sensor 94 is located between the high temperature side first threshold value T4HFT and the high temperature side second threshold value T4HST, the fourth temperature sensor 94 is It is determined that there is an abnormality (primary malfunction). Furthermore, when the measured value T4 of the fourth temperature sensor 94 exceeds the high temperature side second threshold value T4HST to the high temperature side, the fourth temperature sensor 94 is determined to be faulty (secondary malfunction).

  Similarly, as can be understood from FIG. 6, when the measured value T4 of the fourth temperature sensor 94 exists between the low temperature side first threshold value T4LFT and the low temperature side second threshold value T4LST, the fourth temperature is detected. The sensor 94 is determined to be abnormal (primary malfunction). Furthermore, when the measured value T4 of the fourth temperature sensor 94 exceeds the low temperature side second threshold value T4LST to the low temperature side, the fourth temperature sensor 94 is determined to be faulty (secondary malfunction).

  Note that the above-described value relating to α is a positive value (including 0), and is appropriately set and fixed in accordance with the position of each temperature sensor 91 to 94, the height and shape of the storage tank 4, the circumstances of the engine 1, and the like. It may be a value, or a fluctuating value that varies with time or temperature.

  FIG. 7 shows a failure determination process (corresponding to step S102 in FIG. 2) of the temperature sensor group 9 executed by the control device 8. As shown in FIG. 7, a threshold value is set for the temperature sensors constituting the temperature sensor group 9 (step S302). Next, 1 is incremented to the count number i indicating the sensor (step S306). Then, it is determined whether or not the first temperature sensor 91 is in a failure (secondary malfunction) state (step S308). If the first temperature sensor 91 is in a failure (secondary malfunction) state, a failure flag indicating that the first temperature sensor 91 has failed is set (step S310, second means). If the first temperature sensor 91 is not in a failure (secondary malfunction) state, it is determined whether or not the first temperature sensor 91 is in the normal range Tnormal (step S312). If the first temperature sensor 91 is in the normal range Tnormal, a normal flag indicating that the first temperature sensor 91 is normal is set (step S314, normality determining means). If the first temperature sensor 91 is not normal, an abnormal flag is set to indicate that the first temperature sensor 91 is abnormal (primary malfunction) (step S316, first means). Next, it is determined whether or not the count number i is 4 (step S318). If the count number i is less than 4 (No in step S318), the process proceeds to step S306, and 1 is incremented to the count number i indicating the sensor (step S306). Then, it is determined whether or not the second temperature sensor 92 is in a failure (secondary malfunction) state (step S308). If the second temperature sensor 92 is in a failure (secondary malfunction) state, a failure flag indicating that the second temperature sensor 92 has failed is set (step S310). If the third temperature sensor 93 is not in a failure (secondary malfunction) state, it is determined whether or not the second temperature sensor 92 is in the normal range Tnormal (step S312). If the second temperature sensor 92 is in the normal range Tnormal, a normal flag indicating that the second temperature sensor 92 is normal is set (step S314). If the second temperature sensor 92 is not normal, an abnormal flag is set to indicate that the first temperature sensor 91 is abnormal (primary malfunction) (step S316). Next, it is determined whether or not the count number i is 4 (step S318). If the count number i is less than 4 (No in step S318), the process proceeds to step S306, 1 is incremented to the count number i indicating the sensor, the determination process is performed on the third temperature sensor 93 in the same manner as described above, and the fourth The determination process is also performed for the temperature sensor 94 as described above. When normal, abnormal, or failure determination processing is performed for all the temperature sensors 91 to 94, the process returns to the main routine.

  FIG. 8 shows threshold value setting processing for each temperature sensor executed by the control device 8 (corresponding to step S302 in FIG. 7). First, the measured value (measured temperature) of the first temperature sensor 91 to the second temperature sensor 94 is read (step S402). Next, α11, α12, α13, α14... Α41, α42, α43, α44 are obtained (step S404). In this case, it may be read from a map stored in the memory or may be obtained by calculation.

  That is, the high temperature side first threshold value T1HFT, the low temperature side first threshold value T1LFT, the high temperature side second threshold value T1HST, and the low temperature side second threshold value T1LST for the first temperature sensor 91 are obtained and set by calculation. (Step S406). The high temperature side first threshold value T2HFT, the low temperature side first threshold value T2LFT, the high temperature side second threshold value T2HST, and the low temperature side second threshold value T2LST for the second temperature sensor 92 are calculated and set. Similarly, the high temperature side first threshold value T3HFT, the low temperature side first threshold value T3LFT, the high temperature side second threshold value T3HST, and the low temperature side second threshold value T3LST for the third temperature sensor 93 are obtained and set by calculation. To do. Similarly, the high temperature side first threshold value T4HFT, the low temperature side first threshold value T4LFT, the high temperature side second threshold value T4HST, and the low temperature side second threshold value T4LST for the fourth temperature sensor 94 are calculated and set. (Step S406). Then, the process returns to the main routine.

  FIG. 9 shows an estimation process for estimating the measurement value of the temperature sensor in the abnormal range executed by the control device 8 (corresponding to step S138 in the flowchart of FIG. 2). As shown in FIG. 9, it is determined whether or not the uppermost first temperature sensor 91 and the lowermost fourth temperature sensor 94 are abnormal (step S502). If the uppermost first temperature sensor 91 and the lowermost fourth temperature sensor 94 are abnormal, a power generation stop process or a power generation amount reduction process is executed (step S504), and the process returns to the main routine.

  If the uppermost first temperature sensor 91 and the lowermost fourth temperature sensor 94 are not abnormal, the process of estimating the measured value of the temperature sensor is executed. That is, it is determined whether or not the second temperature sensor 92, which is the temperature sensor on the center side, is abnormal (step S506). If the second temperature sensor 92 is not abnormal (No in step S506), it is determined whether the third temperature sensor 93, which is the central temperature sensor, is abnormal (step S508). If the third temperature sensor 93 is determined to be abnormal (Yes in step S508), the measured value T2 of the second temperature sensor 92 above the third temperature sensor 93 determined to be abnormal and the first value determined to be abnormal. The measured value T4 of the fourth temperature sensor 94 below the third temperature sensor 93 is obtained (step S510). And the measured value T3 (estimated value) of the 3rd temperature sensor 93 determined to be unusual is calculated | required by a calculation (step S512, estimation means). In step S512, since the third temperature sensor 93 is abnormal, the second temperature sensor 92 adjacent to the upper side and the fourth temperature sensor 94 adjacent to the lower side are normal. That is, under the condition that the temperature sensors adjacent to the upper side and the lower side of the temperature sensor determined to be abnormal are normal, the control device 8 measures the measured value T2 of the second temperature sensor 92 (determined to be abnormal). The measured value of the upper temperature sensor of the temperature sensor) and the measured value T4 of the fourth temperature sensor 94 (measured value of the lower temperature sensor of the temperature sensor determined to be abnormal) are added and divided by two.

  That is, the control device 8 performs an operation for obtaining an average value (intermediate value) between the measurement value T2 of the second temperature sensor 92 and the measurement value T4 of the fourth temperature sensor 94, and obtains the average value (intermediate value). Then, this average value (intermediate value) is used as the estimated value of the measured value T3 of the third temperature sensor 93 determined to be abnormal.

  If the second temperature sensor 92 is abnormal as a result of the determination in step S506 (Yes in step S506), it is determined whether the third temperature sensor 93 is abnormal (step S518). If the third temperature sensor 93 is abnormal (Yes in step S518), both the second temperature sensor 92 and the third temperature sensor 93 on the center side constituting the temperature sensor group 9 are abnormal. A power generation amount reduction process is executed (step S504).

  If the third temperature sensor 93 is not abnormal (No in step S518), since the second temperature sensor 92 is abnormal, the measured value T1 of the first temperature sensor 91 above the second temperature sensor 92 and the second The measured value T3 of the third temperature sensor 93 below the temperature sensor 92 is obtained (step S520). And the measured value (estimated value) of the 2nd temperature sensor 92 is calculated (step S522, an estimation means). That is, when it is determined in step S522 that the second temperature sensor 92 is abnormal, the upper first temperature sensor 91 and the lower third temperature sensor 93 are normal. The control device 8 adds the measurement value T1 of the first temperature sensor 91 and the measurement value T3 of the third temperature sensor 93 and divides by two. That is, the control device 8 calculates the average value of the measurement value T1 of the first temperature sensor 91 and the measurement value T3 of the third temperature sensor 93 by calculation. This average value (intermediate value) is used as an estimated value of the measured value T2 of the second temperature sensor 92. Then, the process returns to the main routine.

  In the description of the flowchart shown in FIG. 9, an abnormal word / phrase can be replaced with a fault word / phrase. Therefore, even when it is determined that a certain temperature sensor 92 is in failure, measurement of both temperature sensors is performed under the condition that the upper temperature sensor and the lower first temperature sensor are normal. The control device 8 can estimate the intermediate value as the measured value of the temperature sensor determined as a failure.

  FIG. 10 shows a tank heat quantity estimation process (step S110 in FIG. 2) for estimating the heat quantity of the heated water stored in the storage tank 4. First, the water temperature of the water source supplied to the storage tank 4 is measured (step S602). Next, the temperatures of the first temperature sensor 91, the second temperature sensor 92, the third temperature sensor 93, and the fourth temperature sensor 94 are measured (step S604). Next, the amount of heat generated by the heated water is calculated (step S606), and the process returns to the main routine. FIG. 10 shows an arithmetic expression for obtaining the heat quantity Q (heat quantity with respect to water to be supplied) accumulated as heating water in the storage tank 4. The amount of heat Q accumulated as heating water in the storage tank 4 is obtained based on this arithmetic expression.

  11A and 11B show simulation results of changes in the amount of heat of the heating water accumulated in the storage tank 4. FIG. 11A shows the simulation result of the comparative example. In the comparative embodiment, after the temperature sensor is abnormal, the simulation is performed without using the temperature value of the temperature sensor that is abnormal. FIG. 11B shows a simulation result when the temperature of the abnormal temperature sensor is estimated according to the first embodiment. In FIGS. 11A and 11B, the amount of heat when all the temperature sensors 91 to 94 are normal is shown as characteristic lines X1 and X2, and the amount of heat when one temperature sensor is abnormal is the characteristic line Y1. , Y2. 11A and 11B, it is assumed that one temperature sensor in the temperature sensor group 9 becomes abnormal at time tc after the start of the system.

  According to the comparative form shown in FIG. 11A, the temperature sensor that is abnormal at time tc detects a temperature that is lower than the actual water temperature. According to this comparative mode, the amount of heat accumulated as heated water in the storage tank 4 deviates considerably from the time tc onward, as can be understood from the comparison between the characteristic line X1 and the characteristic line Y1. In other words, according to the comparison mode, the characteristic line Y1 is largely deviated by ΔW1 compared to the characteristic line X1 when all the temperature sensors are normal.

  On the other hand, according to the first embodiment shown in FIG. 11B, even when the temperature sensor is determined to be abnormal at time tc, the temperature of the temperature sensor that has been abnormal is estimated after time tc. Then, the Konje system is operated using the estimated value. For this reason, according to the first embodiment, as indicated by the characteristic line X2, the amount of heat can be accumulated as heated water in the storage tank 4 in substantially the same manner as when the temperature sensor is normal after time tc. That is, the amount of heat accumulated as heated water in the storage tank 4 is not significantly different from the characteristic line X2 when all the temperature sensors 91 to 94 are normal, or is considerably small after the time tc. . Even if it deviates, it is about ΔW3. ΔW3 according to the first embodiment is considerably smaller than ΔW1 and ΔW2 according to the comparative embodiment.

  As described above, according to the present embodiment, when the measured values of the first temperature sensor 91 to the fourth temperature sensor 94 constituting the temperature sensor group 9 exceed the normal range Tnormal and are in the abnormal (primary malfunction) range. The control device 8 estimates that the temperature sensor is abnormal (primary malfunction). When the measured value of the temperature sensor exceeds the abnormal (primary malfunction) range to the high temperature side or the low temperature side, the control device 8 estimates that the temperature sensor is faulty (secondary malfunction).

  Furthermore, according to the present embodiment, the control device 8 determines that the warning unit 85 when the first temperature sensor 91 to the fourth temperature sensor 94 constituting the temperature sensor group 9 are estimated to be in an abnormal state (primary malfunction). In addition, the engine 1 and the generator 2 are allowed to maintain the power generation operation while outputting the primary warning (light warning). When it is estimated that the first temperature sensor 91 to the fourth temperature sensor 94 constituting the temperature sensor group 9 are out of order (secondary malfunction), the power generation operation is stopped or the power generation amount is reduced with respect to the engine 1 and the generator 2. The process is executed and a secondary warning (heavy warning) is given to the warning unit 85. The temperature sensors 91 to 94 are maintained by the secondary warning, and the system is maintained as necessary.

  Incidentally, although the temperature sensors 91 to 94 are normal, it may be determined that the temperature sensors 91 to 94 are abnormal (primary malfunction). This is considered to be due to the movement of water in the storage tank 4. Therefore, according to the present embodiment, even when any one of the temperature sensors 91 to 94 is determined to be abnormal (primary malfunction) as shown in the flowchart of FIG. When it is possible to estimate the measured value of the temperature sensor determined to be (next malfunction) (step S122), the process proceeds to step S110 via step S136 and step S138, and the control device 8 performs the tank heat amount estimation process. While being executed, the power generation operation is maintained for the engine 1 and the generator 2.

  And when the measured value of the temperature sensor once determined to be primary malfunction returns to the normal range Tnormal, while performing the tank heat quantity estimation process based on the actual measured value measured by the temperature sensor, Continue to maintain power generation operation. Thus, even if it is determined that the temperature sensor is once abnormal (primary malfunction), the engine 1 and the generator 2 (power generation source) are not stopped one by one. For this reason, it is not necessary to carry out the troublesome startup process after stopping the engine 1 and the generator 2 (power generation source). Furthermore, the energy saving effect by a cogeneration system can be utilized continuously. As described above, since the power generation operation is maintained for the engine 1 and the generator 2 of the cogeneration system, the cost reduction effect by the cogeneration can be obtained. Further, when it is determined that the temperature sensor is in a failure (secondary malfunction) state (No in step S134), it is determined whether it is necessary to stop the power generation operation after a heavy warning (secondary warning) for the engine 1 and the generator 2 If it is not necessary to stop the operation, the power generation operation is continued while the power generation amount reduction control is performed.

  Furthermore, according to this embodiment, it is determined that any one of the first temperature sensor 91 to the fourth temperature sensor 94 constituting the temperature sensor group 9 is abnormal (primary malfunction) or malfunction (secondary malfunction). Between the measured value of the temperature sensor provided at a position higher than the temperature sensor and the measured value of the temperature sensor provided at a position lower than the temperature sensor. Based on the intermediate value (for example, average value) as a reference, the measured value of the temperature sensor determined to be abnormal or faulty is estimated, and based on this estimated value, the tank heat quantity estimation process is executed. Therefore, even if it is determined that the temperature sensor is abnormal (primary malfunction) or malfunction (secondary malfunction), the cost reduction effect by the cogeneration system can be obtained.

(Embodiment 2)
Since this embodiment has basically the same configuration and operational effects as the first embodiment, FIGS. 1 to 11 are applied mutatis mutandis. Also in the present embodiment, among the first temperature sensor 91, the second temperature sensor 92, the third temperature sensor 93, and the fourth temperature sensor 94, the second temperature sensor 92 and / or the third temperature sensor 93 (even on the uppermost side, When the temperature sensor (which is arranged at an intermediate position that is not the lowest side) is faulty (or abnormal), the control device 8 estimates the measured value.

  Here, when it is determined that the second temperature sensor 92 is abnormal or malfunctioning, the condition is that the upper first temperature sensor 91 and the lower third temperature sensor 93 are normal. The control device 8 adds the measured value T1 of the first temperature sensor 91 and the measured value T3 of the third temperature sensor 93 to obtain η1 (η1 = is in the range of 1.3 to 2.7, particularly 1 Divided by any value within the range of .5 to 2.5). η1 is a value that weights the temperature distribution according to factors such as the position of each temperature sensor in the storage tank 4.

  As described above, the control device 8 obtains an intermediate value between the measurement value T1 of the first temperature sensor 91 and the measurement value T3 of the third temperature sensor 93, and estimates the intermediate value of the measurement value T2 of the second temperature sensor 92. Value.

  In addition, when it is determined that the third temperature sensor 93 is abnormal or malfunctioning, under the condition that the upper second temperature sensor 92 and the lower fourth temperature sensor 94 are normal, The control device 8 adds the measured value T2 of the second temperature sensor 92 and the measured value T4 of the fourth temperature sensor 94 to obtain η2 (η2 = is in the range of 1.3 to 2.7, particularly 1. Any value in the range of 5 to 2.5). That is, the control device 8 obtains an intermediate value between the measured value T2 of the second temperature sensor 92 and the measured value T4 of the fourth temperature sensor 94, and uses this intermediate value as an estimated value of the measured value T3 of the third temperature sensor 93. To do. η2 is a value that weights the temperature distribution according to factors such as the position of each temperature sensor in the storage tank 4.

(Embodiment 3)
Since this embodiment has basically the same configuration and operational effects as the first embodiment, FIGS. 1 to 11 are applied mutatis mutandis. In FIG. 1, when the flow rate of water flowing through the water discharge unit 6 and / or the water supply unit 7 exceeds the first predetermined flow rate VSET, the flow rate of water entering and exiting the storage chamber 40 of the storage tank 4 is large. The mobility of water in the storage chamber 40 is predicted to be high. The flow rate means a flow rate per unit time.

  In the above case, since the flow rate of water entering and exiting the storage chamber 40 of the storage tank 4 is large, the influence of the water movement in the storage chamber 40 is more than normal, and the temperature sensors 91 to 94 are normal. Nevertheless, there is a risk of erroneous determination of whether the temperature sensors 91 to 94 are correct. Here, the normal time means when the flow rate of water flowing through the water discharger 6 and / or the water supply unit 7 does not exceed the first predetermined flow rate VSET.

  Therefore, according to the present embodiment, the following is performed. That is, as described above, the second flow rate sensor 65 is provided as a flow rate detection unit that detects the flow rate of water discharged from the water discharge unit 6. A first flow rate sensor 75 is provided as a flow rate detection unit that detects the flow rate of water supplied to the water supply unit 7. When the flow rate detected by at least one of the flow sensors 65 and 75 exceeds the first predetermined flow rate VSET, the control device 8 defines the first threshold value that defines the normal range Tnormal and the first malfunction range that defines the primary malfunction range. 2 The threshold value is relaxed in the direction of expanding the normal range Tnormal and the primary malfunction range. When the normal state is restored, the threshold value is restored.

  As described above, according to the present embodiment, although the temperature sensors 91 to 94 are normal, due to the influence of the movement of water in the storage tank 4, there is an abnormality (primary malfunction) or failure (secondary malfunction). It is suppressed that it is misjudged that there exists. The value of the first predetermined flow rate VSET can be set according to the volume and shape of the storage chamber 40 of the storage tank 4. Since the water level of the storage tank 4 is generally maintained at a substantially constant water level (a water level above the uppermost first temperature sensor 91, for example, full), the flow rate of water discharged from the storage tank 4 And the flow volume of the water replenished to the storage tank 4 is considered to be basically the same.

  Therefore, according to the present embodiment, the second temperature sensor 92 is set to the aforementioned threshold value T2HFT = T1 + α21 + Δβ21. The threshold value T2HST = T1 + α22 + Δβ22. The threshold value T2LFT = T3-α23−Δβ23. The threshold value T2LST = T3−α24−Δβ24 is set.

  The third temperature sensor 93 has a threshold value T3HFT = T2 + α31 + Δβ31. The threshold value T3HST = T2 + α32 + Δβ32. The threshold value T3LFT = T4−α33−Δβ33. The threshold value T3LST = T4−α34−Δβ34. The measured value T1 of the first temperature sensor 91 is set to a threshold value T1HFT = T0 + α11 + Δβ11. The threshold value T1HST = T0 + α12 + Δβ12.

  The measured value T1 of the first temperature sensor 91 is set to a threshold value T1LFT = T2−α13−Δβ13. The threshold value T1LST = T2−α14−Δβ14.

  For the fourth temperature sensor 94, the threshold value T4HFT = T3 + α41 + Δβ41 is set. The threshold value T4HST = T3 + α42 + Δβ42. The threshold value T4LFT = T5−α43−Δβ43. The second threshold value T4LST = T5−α44−Δβ44. Here, the value related to β is a positive arbitrary value (exceeding 0), corresponds to a correction term for the value related to α, and may be a fixed value or a fluctuation value that varies depending on a measured value or the like. .

  Note that the value related to α and the value related to β are appropriately set according to the height positions of the temperature sensors 91 to 94 in the storage chamber 40, the height and shape of the storage chamber 40 of the storage tank 4, the circumstances of the engine 1, and the like. The The value related to α and the value related to β may be stored in the memory of the control device 8 and read each time, or may be obtained by calculation based on an arithmetic expression.

  Further, according to the present embodiment, the threshold relaxation amount may be increased according to the flow rate Vs detected by the second flow rate sensor 65 and the flow rate Vf detected by the first flow rate sensor 75. In other words, the larger the flow rate Vs and / or the flow rate Vf, the larger the amount of water withdrawing / withdrawing from the storage tank 4, and thus the movement of heated water tends to occur in the storage tank 4, and the control device 8 has a normal temperature sensor. There is a possibility that 91 to 94 are erroneously determined as abnormal or faulty. For this reason, as the flow rate Vs and / or the flow rate Vf is larger, the value related to α and the value related to β are increased. Similarly, as the flow rate Vs and / or the flow rate Vf is smaller, the value related to α and the value related to β are decreased. As a result, the threshold value is corrected in a relaxing direction.

  In this case, the relationship between the value related to α, the value related to β, and the flow rate Vs (or flow rate Vf) is mapped and stored in a memory, and read from the map as the flow rate Vs (or flow rate Vf) changes. good. Alternatively, the relationship between the value related to α, the value related to β, and the flow rate Vs (or flow rate Vf) may be expressed as an arithmetic expression, and may be obtained by calculation each time the flow rate Vs (or flow rate Vf) changes.

(Embodiment 4)
Since this embodiment has basically the same configuration and operational effects as the first embodiment, FIGS. 1 to 11 are applied mutatis mutandis. When the heating water in the storage chamber 40 is not used for a long time, the difference between the temperature of the upper heating water and the temperature of the lower heating water tends to be small. Therefore, the temperature difference ΔT between the uppermost first temperature sensor 91 and the lowermost fourth temperature sensor 94 spaced apart in the height direction in the temperature sensor group 9 may be less than the first predetermined temperature. In this case, since the temperature range determined as the normal range is narrow, even when the water does not actively enter and exit the storage chamber 40 of the storage tank 4, the temperature sensors 91 to 94 are normal. Therefore, there is a possibility that an erroneous determination of whether the temperature sensors 91 to 94 are correct is induced.

  For example, according to FIG. 3 showing the threshold value for the measured value T2 of the second temperature sensor 92, the measured value T1 of the first temperature sensor 91 above the second temperature sensor 92 and the second temperature sensor 92 Also, the measured value T3 of the lower third temperature sensor 93 approaches the measured value T2 of the second temperature sensor 92. For this reason, the temperature range of the normal range Tnormal (see FIG. 3) in which the second temperature sensor 92 is determined to be normal tends to be narrowed.

  Therefore, when the temperature difference ΔT between the first temperature sensor 91 and the fourth temperature sensor 94 is less than the first predetermined temperature, the control device 8 uses the first threshold values T2HFT and T2LFT that define the normal range Tnormal. And / or the second threshold values T2HST and T2LST defining the primary malfunction range are relaxed in the direction of expanding the normal range Tnormal and / or the primary malfunction range. The relaxation can be performed by increasing the value related to α and / or the value related to β as in the third embodiment. The first predetermined temperature, the value related to α and / or the value related to β are the height position of each temperature sensor 91 to 94 in the storage chamber 40, the height and shape of the storage chamber 40 of the storage tank 4, the engine 1. It is set appropriately according to the circumstances.

  According to the present embodiment, the temperature difference ΔT between the uppermost first temperature sensor 91 and the lowermost fourth temperature sensor 94 of the temperature sensor group 9 spaced apart in the height direction is used as a reference. Not limited to this, the temperature difference between the first temperature sensor 91 and the third temperature sensor 93 may be used as a reference. Further, a temperature difference between the second temperature sensor 92 and the fourth temperature sensor 94 may be used as a reference.

(Embodiment 5)
Since this embodiment has basically the same configuration and operational effects as the first embodiment, FIGS. 1 to 11 are applied mutatis mutandis. There is a state in which the temperature difference ΔT between the uppermost first temperature sensor 91 and the lowermost fourth temperature sensor 94 of the temperature sensor group 9 spaced apart in the height direction exceeds the second predetermined temperature. That is, the temperature difference ΔT between the first temperature sensor 91 and the lower fourth temperature sensor 94 is large, and among the heated water stored in the storage chamber 40, the temperature of the upper heated water and the lower heated water are Sometimes the difference from temperature is large. In this case, heated water in the storage chamber 40 is discharged from the water discharge unit 6, or cold supplementary water is supplied to the storage chamber 40 from the water supply unit 7, so that the amount of water in and out of the storage chamber 40 of the storage tank 4 is large. Sometimes, the position of the low temperature water on the bottom side in the storage chamber 40 may move in the storage chamber 40. For this reason, although the temperature sensors 91 to 94 are normal, there is a possibility that the correctness of the temperature sensors 91 to 94 is erroneously determined.

  Therefore, the control device 8 detects when the temperature difference ΔT between the first temperature sensor 91 and the fourth temperature sensor 94 exceeds the second predetermined temperature and / or when the amount of water entering and exiting the storage chamber 40 is large (flow rate Vs and When the flow rate Vf is large), the control device 8 sets the first threshold value that defines the normal range Tnormal and / or the second threshold value that defines the primary malfunction range to the normal range and / or 1 Relieve in the direction of expanding the next malfunction range. As in the third embodiment, the relaxation can be performed by considering a value related to α and a value related to β.

  When the temperature difference ΔT is large, when the water in the storage chamber 40 moves, the influence of the water temperature on the bottom side of the storage chamber 40 is large. Therefore, as the temperature difference ΔT increases, the value related to α and β The value can be increased. Further, the smaller the temperature difference ΔT, the more the value related to α and the value related to β can be reduced. As a result, the threshold value can be corrected in a relaxing direction.

  According to the present embodiment, when the second predetermined time has elapsed from the reference time after the entry / exit of water to / from the storage chamber 40 is stopped or the measurement count exceeds the second predetermined count, the movement of the water in the storage chamber 40 is calmed down. Therefore, the relaxation of the threshold value can be canceled and the first threshold value and / or the second threshold value can be restored.

  The second predetermined temperature, the value related to α, and the value related to β depend on the height position of each temperature sensor 91 to 94 in the storage chamber 40, the height and shape of the storage chamber 40 of the storage tank 4, the circumstances of the engine 1, and the like. It is set accordingly.

  According to the present embodiment, the temperature difference ΔT between the uppermost first temperature sensor 91 and the lowermost fourth temperature sensor 94 spaced apart in the height direction in the temperature sensor group 9 is used as a reference. Not limited to this, the temperature difference between the first temperature sensor 91 and the third temperature sensor 93 may be used as a reference. Further, a temperature difference between the second temperature sensor 92 and the fourth temperature sensor 94 may be used as a reference.

(Application 1)
FIG. 12 shows Application Mode 1. As shown in FIG. 12, an engine cooling water circulation path 100 for circulating the engine cooling water is provided. The engine coolant circulation path 100 includes a first pump 101, an engine 1, a three-way valve 102 (switching valve), a radiator 103, and a first heat exchange unit 104 f on the heat radiation side of the heat exchanger 104. A heated water circulation path 200 for circulating the heated water in the storage tank 4 is provided. The heated water circulation path 200 is provided with a storage tank 4, a second pump 202, and a second heat exchange section 104 s on the heat receiving side of the heat exchanger 104. In the heat exchanger 104, the first heat exchange unit 104f and the second heat exchange unit 104s exchange heat. At the beginning of driving when the engine 1 starts driving, the engine 1 is not heated so much and the temperature of the engine cooling water flowing through the engine cooling water circulation path 100 is low. Therefore, the engine cooling water flows to the radiator 103 side by the three-way valve 102. Do not. On the other hand, when the engine 1 starts driving and the time elapses, the engine 1 gradually increases in temperature, and the temperature of the engine cooling water flowing through the engine cooling water circulation path 100 increases. Since the replacement is insufficient, the engine cooling water is caused to flow to the radiator 103 side by the three-way valve 102 and radiated by the radiator 103.

  When engine cooling water circulates in the engine cooling water circulation path 100, the first heat exchange unit 104f and the second heat exchange unit 104s exchange heat, so the second pump 202 is driven to circulate the water in the storage tank 4 with heated water. If it is made to circulate through the path 200, the water flowing through the heating water circulation path 200 gradually increases in temperature. As a result, the water stored in the storage tank 4 gradually increases in temperature, and the amount of heat stored in the storage tank 4 increases. According to this application mode, the heated water in the storage tank 4 is directly used in the heated water consuming unit 5 (general household or business store), and can be used for bathing and eating and drinking.

(Application 2)
FIG. 13 shows Application Mode 2. As shown in FIG. 13, an engine coolant circulation path 100 that circulates engine coolant is provided. The engine coolant circulation path 100 is provided with a first pump 101, an engine 1, a three-way valve 102 (switching valve), a radiator 103, and a storage tank 4. The engine cooling water is stored in the storage tank 4. A tank water circulation path 300 for circulating the tank water of the storage tank 4 is provided. The tank water circulation path 300 is provided with a third heat pump 304 and a first heat exchange section 304 f on the heat radiation side of the heat exchanger 304. A use water supply passage 400 connected to the heated water consumption unit 5 is provided. When the fourth pump 404 provided in the used water supply passage 400 is driven, the used water in the used water supply passage 400 circulates. The heat exchanger 304 exchanges heat with the second heat exchange unit 304s of the first heat exchange unit 304f. When time elapses after the engine 1 starts driving, the temperature of the engine 1 gradually increases, and the temperature of the engine cooling water flowing through the engine cooling water circulation path 100 increases. Therefore, the three-way valve 102 supplies the engine cooling water to the radiator 102 side. And the radiator 102 radiates heat. At this time, the tank water of the storage tank 4 is gradually heated and stored. Since the third pump 303 is driven, the water in the storage tank 4 circulates through the tank water circulation path 300. Since the fourth pump 404 is driven, water flows through the use water supply passage 400. If the opening / closing valve 406 is opened, heated water for the used water supply passage 400 is obtained. According to this application mode, the water in the storage tank 4 is not directly used for eating and drinking in the heated water consumption unit 5 (general household or business store), but is used as engine cooling water.

(Other)
According to the above-described embodiment, the number of temperature sensors constituting the temperature sensor group 9 is four, but is not limited to this. It may be 5 or more, and can be set according to the height of the storage tank 4 or the like. The plurality of temperature sensors constituting the temperature sensor group may be arranged at equal intervals or at irregular intervals. According to the above-described embodiment and application mode, the generator 2 driven by the engine 1 is employed as the power generation source, but is not limited thereto, and may be a fuel cell that generates power with fuel and oxidant. Since it takes time to start and stop the fuel cell, it is useful to be able to suppress unnecessary stop of the fuel cell. Although the water discharge part 6 is connected to the upper part of the storage chamber 40 of the storage tank 4, it is not limited to this. The water supply pipe 71 of the water supply unit 7 communicates with the lower part of the storage chamber 40, but is not limited thereto, and may be an intermediate part. The present invention is not limited to the embodiments and application modes described above, and can be implemented with appropriate modifications within a range not departing from the gist. The following technical idea can be understood from the above description.

  [Additional Item 1] A power generation source that generates electrical energy by power generation operation and generates heat energy accompanying power generation, and a heating liquid that is heated based on waste heat caused by the heat energy generated during power generation of the power generation source A storage tank having a storage chamber to be stored, and a temperature sensor group having a plurality of temperature sensors arranged in parallel along the height direction of the storage chamber, and heating liquid in the storage chamber of the storage tank outside the storage tank A cogeneration system comprising: a liquid discharge part that discharges the liquid to the storage tank; a liquid supply part that supplies a replenisher to the storage chamber of the storage tank; and a control device that controls the power generation.

  [Additional Item 2] A storage tank having a storage chamber for storing the heated heating liquid, and a temperature sensor group having a plurality of temperature sensors arranged in parallel along the height direction of the storage chamber, and storage In a storage tank apparatus comprising: a liquid discharge section that discharges heating liquid in a storage chamber of the tank to the outside of the storage tank; a liquid supply section that supplies replenishment liquid to the storage chamber of the storage tank; and a control device that controls a power generation source The control device includes a first threshold value that defines a normal range for a measurement value of at least one temperature sensor in the temperature sensor group, and a primary that is wider than the normal range while overlapping the normal range. A second threshold value that defines a malfunction range, and when the measured value of the temperature sensor exceeds the normal range and is within the primary malfunction range, the temperature sensor determines that the temperature sensor is malfunctioning first. One means and the temperature sensor When the measured value exceeds the primary upset range, storage tank system, characterized in that the temperature sensor and a second means for determining that the secondary upset even higher slump degree than the primary upset.

[Additional Item 3] In Additional Item 2, the first threshold value includes a high temperature side first threshold value that defines a high temperature side of the normal range and a low temperature side first value that defines a low temperature side of the normal range. And the i-th temperature sensor from above or below and disposed at an intermediate position excluding the uppermost temperature sensor and the lowermost temperature sensor in the temperature sensor group. of the measured value and T _i, the measured value of the temperature sensor just above the said temperature sensor T _i and T _i-1, the measured value of said temperature sensor immediately below said temperature sensor T _i and T _{i + 1,} and, wherein When the high temperature side first threshold value for the temperature sensor T _i is T _i HFT and the low temperature side first threshold value is T _i LFT, T _i HFT = T _i−1 + α1 and T _i Storage tank characterized by LFT = T _{i + 1} −α3 Equipment. α1 and α3 are arbitrary values (including 0)

  The present invention can be used in a cogeneration system that uses power generation and waste heat.

It is a conceptual diagram which shows a cogeneration system. It is a flowchart in which a control apparatus performs an electric power generation process. It is a figure which shows the threshold value of a 2nd temperature sensor. It is a figure which shows the threshold value of a 3rd temperature sensor. It is a figure which shows the threshold value of a 1st temperature sensor. It is a figure which shows the threshold value of a 4th temperature sensor. It is a flowchart in which a control apparatus performs a temperature sensor failure determination process. It is a flowchart which performs the process which a control apparatus sets the threshold value about a temperature sensor. It is a flowchart with which a control apparatus performs the estimation process of the measured value of a temperature sensor. It is a flowchart in which a control apparatus performs a tank calorie | heat amount estimation process. (A) is a graph which shows the simulation result which concerns on a comparison form, (B) is a graph which shows the simulation result which concerns on Embodiment 1. FIG. It is a conceptual diagram which shows the cogeneration system which concerns on the application form 1 and has a storage tank which has a temperature sensor group. It is a conceptual diagram which shows the cogeneration system which concerns on the application form 2 and has a storage tank which has a temperature sensor group.

Explanation of symbols

  1 is an engine (power generation source), 2 is a generator (power generation source), 4 is a storage tank, 40 is a storage chamber, 5 is a heated water consumption unit, 6 is a water discharge unit (liquid discharge unit), and 7 is a water supply unit (supply unit). (Liquid part), 8 is a control device, 9 is a temperature sensor group, 91 is a first temperature sensor, 92 is a second temperature sensor, 93 is a third temperature sensor, and 94 is a fourth temperature sensor.

Claims (8)

A power generation source for generating electric energy by power generation operation and generating heat energy accompanying power generation;
A storage chamber for storing a heating liquid heated based on waste heat generated by the thermal energy generated during power generation of the power generation source, and a plurality of the storage chambers arranged in parallel along the height direction of the storage chamber A storage tank having a temperature sensor group having a temperature sensor;
A discharge part for discharging the heating liquid in the storage chamber of the storage tank to the outside of the storage tank;
A liquid supply unit for supplying a replenisher to the storage chamber of the storage tank;
For a measurement value of at least one of the temperature sensors in the temperature sensor group, a first threshold value that defines a normal range and a first threshold range that is wider than the normal range while overlapping the normal range. A first means for determining that the temperature sensor is in primary failure when the measured value of the temperature sensor exceeds the normal range and is in the primary failure range; and the temperature And a second control unit that determines that the temperature sensor has a secondary malfunction that is higher in degree of malfunction than the primary malfunction when the measured value of the sensor exceeds the primary malfunction range. Cogeneration system characterized by that. The control device according to claim 1, wherein when the control device determines that at least one of the temperature sensors is in the primary malfunction, the control device performs power generation operation maintenance for the power generation source;
When it is determined that at least one of the temperature sensors is the secondary malfunction, the power generation operation is stopped, the power generation amount is reduced, the secondary malfunction is informed to the power generation power, and the power generation And a means for carrying out at least one of the heat storage operations in which the heat energy of the power generation source is stored in another heat storage section while continuing power generation.   3. The control device according to claim 1, wherein the control device maintains power generation operation for the power generation source when it is determined that at least one of the temperature sensors is the primary malfunction or the secondary malfunction. And a cogeneration system, wherein the power generation operation is continued when the measured value of the temperature sensor determined to be the primary malfunction or the secondary malfunction returns to the normal range.   4. The control device according to claim 1, wherein the control device is higher in height than the temperature sensor when it is determined that at least one of the temperature sensors is primary malfunction or secondary malfunction. Based on an intermediate value between a measured value of the temperature sensor provided at a position and a measured value of the temperature sensor provided at a position lower than the temperature sensor, the primary malfunction or A cogeneration system comprising: an estimation unit that estimates a measurement value of the temperature sensor that is determined to be secondary malfunction. 5. The first threshold value according to claim 1, wherein the first threshold value is a high temperature side first threshold value that defines a high temperature side of the normal range, and a low temperature side value that defines a low temperature side of the normal range. 1 and is arranged at an intermediate position excluding the uppermost temperature sensor and the lowermost temperature sensor in the temperature sensor group, and the i th from above or below. the measured value of the temperature sensor and T _i, the measured value of the temperature sensor just above the said temperature sensor T _i and T _i-1, the measured value of said temperature sensor immediately below said temperature sensor T _i and T _{i + 1,} and ,
When the high temperature side first threshold value for the temperature sensor T _i is T _i HFT and the low temperature side first threshold value is T _i LFT, T _i HFT = T _i−1 + α1 and T _A cogeneration system characterized by _i LFT = T _{i + 1} −α3. α1 and α3 are arbitrary values (including 0) 6. The second threshold value according to claim 5, wherein the second threshold value defines a high temperature side second threshold value defining the high temperature side of the primary malfunction range and a low temperature side second threshold value defining the low temperature side of the primary malfunction range. Formed with values,
T _i HST = T _i−1 + α2 when the high temperature side second threshold value for the measured value T _i of the temperature sensor is T _i HST and the low temperature side second threshold value is T _i LST. Yes, a cogeneration system characterized by T _i LST = T _{i + 1} −α4. α2 and α4 are arbitrary values (not including 0) In one of claims 1 to 6, a flow rate detection unit for detecting a flow rate of the liquid flowing through the liquid discharge unit and / or the liquid supply unit is provided,
When the flow rate per unit time detected by the flow rate detection unit exceeds a predetermined flow rate, the control device defines the first threshold value that defines the normal range and / or the first malfunction range that defines the primary malfunction range. The cogeneration system is characterized in that two threshold values are relaxed in a direction in which the normal range and / or the primary malfunction range is expanded as compared with a case where the flow rate does not exceed the predetermined flow rate. In one of Claims 1-7, when the temperature difference of a plurality of the temperature sensors spaced apart in the height direction among the temperature sensor group is less than a predetermined temperature,
The control device compares the first threshold value that defines the normal range and / or the second threshold value that defines the primary malfunction range when the temperature difference is not less than the predetermined temperature. The cogeneration system is characterized in that the normal range and / or the primary malfunction range is relaxed.

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