JP2022182650A - Fuel consumption amount prediction method and prediction device of emergency power generator drive engine, and operation time prediction method and prediction device of emergency power generator drive engine - Google Patents

Abstract

To accurately predict a future fuel consumption amount by taking into consideration the expansion contraction of fuel caused by an ambient temperature when predicting the future fuel consumption amount on the basis of a secular change of an engine which drives an emergency power generator.SOLUTION: A fuel consumption amount prediction method measures and stores a flow rate V1 and a temperature T1 of supply fuel flowing in a fuel supply flow passage 4, and a flow rate V2 and a temperature T2 of return fuel flowing in a return flow passage 5 when load tests of an emergency power generator are performed a plurality of times in a predetermined interval, corrects the flow rate V1 to a flow rate V1a at a prescribed temperature Ta, corrects the flow rate V2 to a flow rate V2a at the prescribed temperature Ta, calculates fuel flow rates Va which are consumed at an engine 3 at the prescribed temperature Ta by subtracting the flow rate V2a from the flow rate V1a, and predicts a future fuel flow rate Vax at the prescribed temperature Ta on the basis of a change of a plurality of the fuel flow rates Va which are obtained by a plurality of times of the load tests in the past.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method and apparatus for predicting the fuel consumption of an engine that drives an emergency power generator, and a method and apparatus for predicting the operating time of the engine. Method and device for predicting fuel consumption of an engine for driving an emergency generator, and for predicting the fuel consumption and operating time, and for driving the emergency generator relates to an engine operating time prediction method and prediction device.

Emergency power generators are installed in factories, buildings, hospitals, etc., and generate power in the event of a power outage due to a disaster or the like, and are driven by an engine (such as a diesel engine). Emergency generators are not used in normal times, but only in emergencies. Therefore, in order to ensure their operation in an emergency, they are tested periodically (for example, once a year) in accordance with the Fire Service Act. It is The test is performed by driving the engine with a constant load (for example, a load of 30% of the rated output) applied to the emergency power generator (see Patent Documents 1 and 2).

By the way, when a power outage actually occurs due to a disaster or the like and an emergency power generator is activated, users are interested in how long the emergency power generator can generate electricity, that is, how long the engine that drives the emergency power generator can operate. matter. Assuming that the fuel tank is full of fuel, this time can be calculated by dividing the tank capacity of the fuel tank by the amount of fuel consumed by the engine per unit time.

Here, as the tank capacity of the fuel tank, the numerical value of the tank capacity described in the specifications of the fuel tank can be used. On the other hand, the amount of fuel consumed by the engine per unit time varies depending on the load applied to the emergency generator during power generation, that is, the load applied to the engine. If is known, the fuel consumption per unit time corresponding to the magnitude of the load can be obtained from the engine specifications. Therefore, by using these, it is possible to formally calculate the operable time of the engine that drives the emergency power generator, that is, the power generation time of the emergency power generator at the time of power failure.

JP 2016-205860 A JP 2018-91650 A JP 2013-24744 A

However, the emergency generator and the engine that drives it will deteriorate over time regardless of whether it is in operation or not. is actually worse than what is stated in the specification. Therefore, it is necessary to calculate the power generation possible time of the emergency power generator in consideration of the aging deterioration of the fuel consumption of the engine according to the length of time (period) since installation.

Therefore, the present inventors provided a fuel flow meter for measuring the amount of fuel consumed by the engine in the fuel flow path connecting the fuel tank and the engine. Secondly, it was considered to memorize the fuel flow rate per unit time measured by the fuel flow meter and to predict the future fuel flow rate based on the change (deterioration) of those fuel flow rates. Specifically, the system predicts the future fuel flow rate by obtaining a regression line using the least-squares method from multiple fuel flow rates obtained from multiple load tests in the past, and by extending the regression line. thought.

However, in this system, if the temperature at the time of the past load test is different, the fuel expands and contracts according to the temperature, so it is not possible to accurately predict the future fuel flow rate. That is, in a load test conducted when the temperature is low (for example, in winter), the volume per unit weight of the fuel flowing through the fuel passage contracts, and in a load test conducted when the temperature is high (for example, in summer), Volume expands per unit weight of fuel flowing through the fuel flow path. For this reason, the fuel flow rate (fuel volume flowing per unit time) measured by the fuel flow meter in the load test when the temperature is low and the fuel flow rate measured by the fuel flow meter in the load test when the temperature is high are different. , it is not appropriate to make a direct comparison, and even if the future fuel flow rate is predicted using the least squares method from these fuel flow rates, it cannot be said to be a highly accurate prediction.

In addition, Patent Document 3 describes an engine fuel consumption measurement device having a fuel supply channel that supplies fuel from a fuel tank to the engine and a return channel that returns fuel that has not been consumed by the engine to the fuel tank. A fuel flow meter is attached to each of the fuel supply channel and the return channel, and the fuel flow rate consumed by the engine is calculated from the difference between the fuel flow rate in the fuel supply channel and the fuel flow rate in the return channel measured by these fuel flow meters. Describes the required technology. However, this technique does not predict the future fuel flow rate based on the secular change of the engine, and the technical premise is different from that of the present invention.

The purpose of the present invention, which was devised in consideration of the above circumstances, is to prevent expansion and contraction of fuel due to temperature when predicting future fuel consumption and operating time based on aging of the engine that drives the emergency generator. To provide a fuel consumption prediction method and prediction device for an emergency power generator drive engine, and an emergency power generator drive engine operating time prediction method and prediction device capable of accurately predicting It is in.

According to the present invention, which has been devised to achieve the above object, a fuel supply passage for supplying fuel from a fuel tank to an engine for driving an emergency generator, and a fuel not consumed by the engine to the fuel tank. A method for estimating the fuel consumption of an engine for driving an emergency power generator having a return flow path for returning the fuel, wherein a load test of the emergency power generator is performed a plurality of times at intervals of a predetermined period, and each load test is performed When the engine is driven, the flow rate V1 and temperature T1 of the supplied fuel flowing through the fuel supply channel are measured and stored, and the flow rate V2 and temperature T2 of the return fuel flowing through the return channel are measured and stored. Step, the flow rate V1 is corrected to the flow rate V1a at the predetermined temperature Ta based on the difference between the temperature T1 and the predetermined temperature Ta when predicting the fuel consumption of the engine, and the flow rate V2 is corrected to the temperature T2 and the predetermined temperature Ta. A step of correcting the flow rate V2a at a predetermined temperature Ta based on the difference between, a step of subtracting the flow rate V2a from the flow rate V1a to calculate the fuel flow rate Va consumed by the engine at the predetermined temperature Ta, predicting a future fuel flow rate Vax at a predetermined temperature Ta based on a plurality of changes in the fuel flow rate Va each obtained by a load test. A fuel consumption prediction method is provided.

In the fuel consumption prediction method for an engine for driving an emergency power generator according to the present invention, when correcting the flow rate V1 to the flow rate V1a at the predetermined temperature Ta based on the difference between the temperature T1 and the predetermined temperature Ta, the following equation Obtain the flow rate V1a using
V1a=V1/(1+β(T1−Ta)) β: Volumetric expansion rate of fuel When correcting the flow rate V2 to the flow rate V2a at the predetermined temperature Ta based on the difference between the temperature T2 and the predetermined temperature Ta, the following equation is used: to obtain the flow rate V2a.
V2a=V2/(1+β(T2-Ta)) β: Volumetric expansion rate of fuel

In the method for predicting fuel consumption of an engine for driving an emergency power generator according to the present invention, based on changes in a plurality of fuel flow rates Va obtained by a plurality of load tests in the past, future fuel consumption at a predetermined temperature Ta When predicting the fuel flow rate Vax, a regression line is obtained using the least-squares method from a plurality of fuel flow rates Va obtained from a plurality of past load tests, and by extending the regression line, the future at a predetermined temperature Ta The fuel flow rate Vax may be predicted.

Further, in the present invention, there is provided a method for estimating the operating time of the engine for driving the emergency generator using the above-described fuel consumption prediction method for the engine for driving the emergency generator, wherein the fuel stored in the fuel tank is and dividing the fuel amount Vt by the future fuel flow rate Vax at the predetermined temperature Ta predicted by the fuel consumption prediction method of the engine for driving the emergency power generator described above, to obtain a predetermined and calculating the operating time of the engine at temperature Ta.

In addition, in the present invention, an emergency generator is provided with a fuel supply passage for supplying fuel from the fuel tank to the engine for driving the emergency generator, and a return passage for returning fuel not consumed by the engine to the fuel tank. A device for predicting the fuel consumption of an engine for driving a power generator, which is provided in a fuel supply channel and measures the flow rate V1 and the temperature T1 of the supplied fuel flowing in the fuel supply channel. measurement means; return fuel flow rate temperature measurement means provided in the return flow path for measuring the flow rate V2 and temperature T2 of the return fuel flowing through the return flow path; return fuel flow rate temperature measurement means and supply fuel flow rate temperature measurement means and a computer connected to the computer, wherein the load test of the emergency generator is performed a plurality of times at predetermined intervals, and when the engine is driven during each load test, the flow rate V1, the temperature T1, the flow rate V2 , the function of storing the temperature T2, and the flow rate V1 is corrected to the flow rate V1a at the predetermined temperature Ta based on the difference between the temperature T1 and the predetermined temperature Ta when predicting the fuel consumption of the engine, and the flow rate V2 is corrected. , a function of correcting the flow rate V2a at a predetermined temperature Ta based on the difference between the temperature T2 and the predetermined temperature Ta, and a function of subtracting the flow rate V2a from the flow rate V1a to calculate the fuel flow rate Va consumed by the engine at the predetermined temperature Ta. and a function of predicting a future fuel flow rate Vax at a predetermined temperature Ta based on changes in a plurality of fuel flow rates Va respectively obtained by a plurality of load tests in the past. An apparatus for predicting fuel consumption of an engine for driving a generator is provided.

In the fuel consumption prediction apparatus for an engine for driving an emergency power generator according to the present invention, the supplied fuel flow rate temperature measuring means is attached to the fuel supply passage and measures the flow rate V1 of the fuel flowing through the fuel supply passage. and a supply fuel thermometer for measuring the temperature T1 of the fuel flowing in the fuel supply passage attached to the fuel supply passage near the supply fuel flow meter, and a return fuel flow temperature measuring means. is attached to the return flow path and measures the flow rate V2 of the fuel flowing through the return flow path; A return fuel thermometer for measuring the temperature T2 may also be provided.

In the fuel consumption prediction apparatus for an engine for driving an emergency power generator according to the present invention, the computer corrects the flow rate V1 to the flow rate V1a at the predetermined temperature Ta based on the difference between the temperature T1 and the predetermined temperature Ta. At the time, it has a function to obtain the flow rate V1a using the following equation,
V1a=V1/(1+β(T1−Ta)) β: Volumetric expansion coefficient of fuel When correcting the flow rate V2 to the flow rate V2a at the predetermined temperature Ta based on the difference between the temperature T2 and the predetermined temperature Ta, the following equation is used: may have a function of obtaining the flow rate V2a by
V2a=V2/(1+β(T2-Ta)) β: Volumetric expansion rate of fuel

In the fuel consumption prediction apparatus for an engine for driving an emergency power generator according to the present invention, a computer calculates a predetermined temperature Ta When predicting the future fuel flow rate Vax at , a regression line is obtained using the least squares method from a plurality of fuel flow rates Va obtained by a plurality of past load tests, and the regression line is extended to obtain a predetermined temperature Ta may have a function of predicting the future fuel flow rate Vax.

Further, in the present invention, a device for predicting the operation time of the engine for driving the emergency generator using the above-described fuel consumption prediction device for the engine for driving the emergency generator, wherein the fuel stored in the fuel tank is The computer is provided with a tank fuel amount measuring means for determining the fuel amount Vt in the future fuel at the predetermined temperature Ta predicted by the fuel consumption amount predicting device for the engine for driving the emergency power generator. There is provided an engine operating time prediction device for driving an emergency power generator, characterized in that it has a function of calculating the operating time of the engine at a predetermined temperature Ta by dividing by the flow rate Vax.

According to the fuel consumption prediction method and prediction device for an emergency generator drive engine and the operating time prediction method and prediction device for an emergency generator drive engine according to the present invention, based on the secular change of the engine, When predicting future fuel consumption and driving time, it is possible to accurately predict fuel expansion and contraction due to temperature.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing an overview of a fuel consumption prediction device for an emergency power generator driving engine and an operating time prediction device for an emergency power generator driving engine according to an embodiment of the present invention; FIG. 3 is an explanatory diagram showing an overview of a fuel consumption prediction method for an emergency power generator drive engine and an emergency power generator drive engine operating time prediction method according to the embodiment; In the method for predicting fuel consumption of an engine for driving an emergency power generator according to the above-described embodiment, based on changes in a plurality of fuel flow rates Va obtained by a plurality of load tests in the past, future FIG. 4 is an explanatory diagram showing a method of predicting a fuel flow rate Vax;

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are given the same reference numerals to omit redundant description, and elements that are not directly related to the present invention are omitted from the drawings. do.

(Overview of Fuel Consumption Prediction Device 1 for Engine 3 for Driving Emergency Generator)
As shown in FIG. 1, a fuel consumption prediction device 1 for an emergency power generator driving engine according to one embodiment of the present invention supplies fuel from a fuel tank 2 to an emergency power generator driving engine 3. It is applied to a system provided with a fuel supply channel 4 for fuel consumption and a return channel 5 for returning fuel not consumed by the engine 3 to the fuel tank 2. This fuel consumption prediction device 1 is provided in a fuel supply channel 4 and includes a supplied fuel flow rate and temperature measuring means 6 for measuring the flow rate V1 and temperature T1 of the supplied fuel flowing through the fuel supply channel 4, a return channel 5 and connected to a return fuel flow rate temperature measurement means 7 for measuring the flow rate V2 and temperature T2 of the return fuel flowing through the return flow path 5, the return fuel flow rate temperature measurement means 7, and the supply fuel flow rate temperature measurement means 6. and a computer 8 configured as a computer. Each component will be described below.

(Fuel supply channel 4, return channel 5)
As shown in FIG. 1, one end 4a of the fuel supply channel 4 is connected to the lower portion of the fuel tank 2 at a position slightly higher than the tank bottom surface 2a. This is to prevent the supply of sediments (rust, water, foreign substances such as impurities) deposited on the bottom surface 2a of the tank to the engine 3. The other end 4b of the fuel supply path 4 is connected to an engine (diesel engine) 3 for driving an emergency power generator. The engine 3 is provided with a high-pressure supply pump 9 for pressure-feeding the fuel supplied from the fuel supply passage 4, a common rail 10 for storing the fuel pressure-fed from the high-pressure supply pump 9 in a high-pressure state, and the fuel in the common rail 10 being pumped into the cylinder of the engine 3. an injector 11 that injects fuel into the fuel, a discharge passage 12 through which fuel not injected from the injector 11 flows, and the like are provided. One end 5 a of the return passage 5 is connected to the discharge passage 12 . The other end 5 b of the return passage 5 is connected to the upper portion of the fuel tank 2 .

(Supply fuel flow rate temperature measurement means 6)
As shown in FIG. 1, the fuel supply channel 4 is provided with a supplied fuel flow rate and temperature measuring means 6 for measuring the flow rate V1 and temperature T1 of the supplied fuel flowing through the fuel supply channel 4 . The supplied fuel flow rate and temperature measurement means 6 includes a supplied fuel flow meter 6V that is attached to the fuel supply flow path 4 and measures the flow rate V1 of the fuel flowing through the fuel supply flow path 4, and a fuel supply near the supplied fuel flow meter 6V. A supplied fuel thermometer 6T that is attached to the flow path 4 and measures the temperature T1 of the fuel flowing through the fuel supply flow path 4 is provided.

In order to reduce the influence of the heat generated in the engine 3, the supply fuel temperature gauge 6T is located closer to the fuel tank 2 than half the length of the fuel supply passage 4 connecting the fuel tank 2 and the engine 3. is arranged at a position closer to the fuel tank 2 than 1/3. Along with this, the supply fuel flow meter 6V provided near the supply fuel thermometer 6T also has a similar arrangement with respect to the length of the fuel supply flow path 4. As shown in FIG.

A thermocouple or the like attached to the outer surface of the fuel supply channel 4 is used as the supply fuel temperature gauge 6T. On the other hand, the supplied fuel flow meter 6V is clamped to the outside of the fuel supply channel 4 and is capable of measuring the flow velocity of the fluid flowing inside the channel. Doppler type non-contact flowmeter such as a meter) is used.

(Return fuel flow rate temperature measurement means 7)
As shown in FIG. 2, the return flow path 5 is provided with return fuel flow rate and temperature measurement means 7 for measuring the flow rate V1 and temperature T1 of the return fuel flowing through the return flow path 5 . The return fuel flow rate temperature measurement means 7 includes a return fuel flow meter 7V that is attached to the return flow path 5 and measures the flow rate V2 of the fuel flowing through the return flow path 5, and a return flow path 5 near the return fuel flow meter 7V. and a return fuel thermometer 7T for measuring the temperature T2 of the fuel flowing through the return passage 5 attached to the return passage 5.

In order to reduce the influence of heat generated by the engine 3, the return thermometer 7T is positioned closer to the fuel tank 2 than half the length of the return passage 5 connecting the engine 3 and the fuel tank 2, preferably at a position closer to the fuel tank 2 than the length of the return passage 5. /3 is arranged at a position closer to the fuel tank 2. Along with this, the return fuel flow meter 7V provided in the vicinity of the return fuel thermometer 7T also has a similar arrangement with respect to the length of the return flow path 5. As shown in FIG.

A thermocouple or the like attached to the outer surface of the return flow path 5 is used as the return fuel thermometer 7T. On the other hand, the return fuel flow meter 7V is clamped to the outside of the return flow path 5 and is capable of measuring the flow velocity of the fluid flowing inside the flow path. Doppler type non-contact flow meter) is used.

(Computer 8)
The computer 8 shown in FIG. 1 performs the load test of the emergency power generator a plurality of times at predetermined intervals, and when the engine 3 is driven during each load test, the flow rate V1, the temperature T1, flow rate V2, and temperature T2 are respectively stored (step 1), and flow rate V1 is stored at the predetermined temperature Ta based on the difference between the temperature T1 and the predetermined temperature Ta when predicting the fuel injection amount of the engine 3. , and the flow rate V2 is corrected to the flow rate V2a at the predetermined temperature Ta based on the difference between the temperature T2 and the predetermined temperature Ta (step 2), and the flow rate V2a is subtracted from the flow rate V1a to obtain the predetermined temperature It also has a function of calculating the fuel flow rate Va consumed by the engine 3 at Ta (step 3). The computer 8 also has a function (step 4) of predicting a future fuel flow rate Vax at a predetermined temperature Ta, based on a plurality of changes in the fuel flow rate Va obtained by a plurality of load tests in the past. Each function (step) is explained below.

(Step 1)
As shown in step 1 (S1) of FIG. 2, the computer 8 of FIG. , the flow rate V1 and temperature T1 of the supplied fuel flowing through the fuel supply passage 4 are measured by the supplied fuel flow rate and temperature measuring means 6 and stored, and the flow rate V2 and temperature T2 of the return fuel flowing through the return passage 5 are measured as the return fuel. The temperature is measured by the flow rate temperature measuring means 7 and stored. The interval at which the load test of the emergency generator is performed (the above-mentioned predetermined period) is determined according to the requirements of the Fire Service Law, and is performed, for example, every year or every six months.

(Step 2)
As shown in step 2 (S2) of FIG. 2, the computer 8 calculates the stored flow rate V1 based on the difference between the temperature T1 and the predetermined temperature Ta when predicting the fuel injection amount of the engine. is corrected to the flow rate V1a at . The following formula is used for this correction.
V1a=V1/(1+β(T1-Ta)) (1)
β: Volume expansion rate of fuel (0.00116/K)

Equation (1) is obtained by developing the following relational expression regarding the volumetric expansion coefficient of a liquid with respect to the reference temperature Vo.
V=Vo(1+βt)
Vo: Volume of liquid at reference temperature
β: Volumetric expansion rate of liquid
t: temperature change from reference temperature

Similarly, the computer 8 corrects the stored flow rate V2 to the flow rate V2a at the predetermined temperature Ta based on the difference between the temperature T2 and the predetermined temperature Ta using the following equation.
V2a=V2/(1+β(T2-Ta)) (2)
β: Volume expansion rate of fuel (0.00116/K)

(First load test)
Specifically, during the first load test (summer),
V1 (ml/min) = 101.16
T1 (°C) = 30
is measured, the predetermined temperature Ta for predicting the fuel injection amount of the engine 3 is, for example,
Ta (°C) = 20 (Spring/Autumn)
and
The flow rate V1a when Ta = 20°C is obtained using equation (1) as follows:
V1a=101.16/(1+0.00116(30-20))=100 (3)
is calculated as

Also, during the first load test (summer),
V2 (ml/min) = 70.9744
T2 (°C) = 32
is measured,
The flow rate V2a when Ta (°C) = 20 (Spring/Autumn) is obtained by using the formula (2)
V2a=70.9744/(1+0.00116(32-20))=70...(4)
is calculated as

(Step 3)
As shown in step 3 (S3) of FIG. 2, the computer 8 performs the above (3) and (4)
Va=V1a-V2a (5)
to calculate the fuel consumption flow rate Va of the engine at a predetermined temperature Ta (20° C.).
Va = V1a - V2a = 100 - 70 = 30
As a result, the fuel consumption flow rate Va=30 is calculated by converting the fuel consumption flow rate of the engine at the time of the first load test (summer) into the fuel consumption flow rate at the predetermined temperature Ta=20° C. (spring/autumn season). .

Enter this Va=30 as the plotted point a of the first test in the graph of FIG. As shown in FIG. 3, the predetermined temperature Ta (20° C.) corresponds to the air temperature when predicting the fuel consumption flow rate of the engine for the next time (sixth time in this embodiment) based on the results of past load tests. do. An air temperature sensor for measuring Ta may be connected to the computer 8 . As a result, when predicting the fuel consumption flow rate Va based on the past load test data at the time of the sixth load test, the temperature measured by the temperature sensor at that time (current time) can be used as Ta.

(Second load test)
Similarly, during the second load test (winter),
V1 (ml/min) = 95.7264
T1 (°C) = 0
is measured,
The flow rate V1a when Ta (°C) = 20 (spring and autumn) is obtained using equation (1) as follows:
V1a=95.7264/(1+0.00116(0-20))=98...(6)
is calculated as

Also, during the second load test (winter),
V2 (ml/min) = 71.47576
T2 (°C) = 2
is measured,
The flow rate V2a when Ta (°C) = 20 (Spring/Autumn) is obtained by using the formula (2)
V2a = 71.47576/(1 + 0.00116 (2-20)) = 73 (7)
is calculated as

As shown in step 3 (S3) in FIG. 2, the computer 8 substitutes (6) and (7) into equation (5) to calculate the fuel consumption flow rate Va at the predetermined temperature Ta (20° C.). .
Va = V1a - V2a = 98 - 73 = 25
As a result, the predetermined temperature Ta=20° C., which is the air temperature when predicting the fuel consumption flow rate of the engine 3 at the time of the second load test (in winter), the next time (sixth time in this embodiment). The consumption fuel flow rate Va=25 converted to (Spring/Autumn) is calculated. Enter this Va=25 as plot point b for the second test in the graph of FIG.

(3rd to 5th load test)
Similarly, as shown in FIG. 3, the fuel consumption flow rate of the engine 3 at the time of the third load test is converted to a predetermined temperature Ta (20° C.) which is the air temperature when predicting the next fuel consumption flow rate. The fuel flow rate Va (Va = 50) is obtained and entered as plot point c, and the fuel consumption flow rate Va (Va = 45 ) is obtained and entered as plot point d, and the fuel consumption flow rate Va (Va = 50) obtained by converting the fuel consumption flow rate of the engine at the time of the fifth load test to a predetermined temperature Ta (20 ° C) is obtained and plotted point e Enter as

Note that the number of load tests is not limited to five, and may be any number of times as long as it is two or more. Moreover, the intervals (periods) of each load test are preferably equal intervals (every year, every six months, etc.), but may be irregular intervals.

(Step 4)
As shown in step 4 (S4) of FIG. 2, the computer 8 determines a predetermined temperature Ta (in this embodiment, 20° C. ) predicts the future fuel flow rate Vax. Specifically, as shown in FIG. 3, the computer 8 calculates a regression line X using the least squares method from plotted points a to e of a plurality of fuel flow rates Va respectively obtained from a plurality of past load tests. and extending the regression line X to predict the future fuel flow rate Vax at the predetermined temperature Ta.

In FIG. 3, the method of obtaining the regression line X using the least squares method from a plurality of plot points a to e of the fuel flow rate Va obtained by a plurality of past load tests (five times in this embodiment) , the well-known method of least squares is used, so a detailed description thereof is omitted. The computer 8 connects the regression line X obtained by the method of least squares with the extension line Y that is extended while maintaining the inclination thereof, so that the future (6th) at the predetermined temperature Ta (20 ° C. in this embodiment) Predict the fuel flow Vax. In this embodiment, as shown in FIG. 3, the next (sixth) fuel flow rate Vax at the predetermined temperature Ta (20° C. in this embodiment) can be predicted as Vax=58. This indicates that the fuel flow rate Vax=58 (ml/min) can be predicted next time when the temperature is 20° C. in spring or autumn when the engine for driving the emergency power generator is driven.

In this embodiment, the scale of the number of load tests written on the horizontal axis of FIG. If the period between load tests is evenly spaced (every year, every six months, etc.), and if the period between adjacent load tests is unequal, the number of load tests entered on the horizontal axis accordingly. The scale of is unevenly spaced.

According to the fuel consumption prediction device 1 for the engine 3 for driving the emergency generator and the prediction method using it according to the present embodiment, the future fuel consumption based on the aging of the emergency generator and the engine 3 When estimating , it is possible to accurately predict the fuel injection amount by considering the expansion and contraction of the fuel due to the temperature.

(Outline of the operating time prediction device 1a for the engine 3 for driving the emergency power generator)
Next, an operating time prediction device 1a for the emergency power generator driving engine 3 according to one embodiment of the present invention will be described. This operating time prediction device 1a for the emergency generator drive engine 3 uses the above-described fuel consumption prediction device 1 for the emergency generator drive engine 3 to A device for predicting time T.

As shown in FIG. 1, an operating time prediction device 1a for an emergency power generator driving engine 3 according to the present embodiment is a component of the fuel consumption prediction device 1 for an emergency power generator driving engine 3 described above. , a tank fuel amount measuring means 13 for obtaining the fuel amount Vt stored in the fuel tank 2 is provided. Further, the computer 8 of the device 1a calculates the fuel amount Vt obtained by the tank fuel amount measuring means 13 at the predetermined temperature Ta predicted by the fuel consumption amount prediction device 1 for the engine 3 for driving the emergency power generator. It has a function of calculating the operating time T of the engine 3 at a predetermined temperature Ta by dividing it by the future fuel flow rate Vax. Each component will be described below.

(Tank fuel amount measuring means 13)
As shown in FIG. 1, the tank fuel amount measuring means 13 measures the amount of fuel Vt stored in the fuel tank 2, and is attached to the top plate 2b of the fuel tank 2. It has a distance sensor 14 for measuring the distance L to the liquid surface 2c of the fuel. For the distance sensor 14, for example, an ultrasonic distance sensor, an optical distance sensor, a radio wave distance sensor, or the like is used. A distance sensor 14 is connected to the computer 8 .

The computer 8, as shown in step 5 (S5) in FIG. It has a function to calculate.
Vt=(HL)S (8)

Here, H is the distance from the top plate 2b of the fuel tank 2 to the hypothetical lower liquid level 2d of the fuel tank 2. The hypothetical lower limit liquid level 2 d is set slightly higher than the connection height of the fuel supply passage 4 connected to the fuel tank 2 . When the air in the fuel tank 2 is sucked into the fuel supply passage 4, so-called air entrapment occurs in the engine (diesel engine) 3, and the air bleeding operation becomes necessary. The hypothetical lower limit liquid level 2d is set so that the air in the fuel tank 2 is not sucked from the fuel supply passage 4 when the fuel tank 2 is closed.

Also, S is the cross-sectional area of the fuel tank 2 . The fuel tank 2 is a rectangular tube or cylinder having a constant cross-sectional area S in the height direction. Therefore, the fuel amount Vt in the fuel tank 2 is calculated by (HL)S as shown in equation (8).

(Computer 8)
The computer 8, as shown in step 6 (S6) in FIG. By dividing by the future fuel flow rate Vax at the predetermined temperature Ta (for example, 20°C) calculated in step 4 (S4) of the amount prediction device 1, the operating time T of the engine 3 at the predetermined temperature Ta (for example, 20°C) It has a function to calculate.
T=Vt/Vax (9)

According to the operating time prediction device 1a for the engine 3 for driving the emergency generator and the operating time prediction method using the same according to the present embodiment, the future operating time is predicted based on the aging of the emergency generator and the engine 3. When predicting T, it is possible to accurately predict the operating time of the engine 3 by considering the expansion and contraction of the fuel due to the air temperature.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is of course not limited to the above-described embodiments, and various modifications within the scope of the claims can be made. It goes without saying that modifications also fall within the technical scope of the present invention.

The present invention is for driving an emergency generator that can accurately predict future fuel consumption and operating time based on aging of the emergency generator and engine by taking into account the expansion and contraction of fuel due to temperature. engine fuel consumption prediction method and prediction device, and emergency generator drive engine operating time prediction method and prediction device.

1 fuel consumption prediction device 1a for emergency generator drive engine operating time prediction device 2 fuel tank 3 emergency generator drive engine 4 fuel supply channel 5 return channel 6 Supplied fuel flow temperature measuring means 6V Supplied fuel flow meter 6T Supplied fuel thermometer 7 Return fuel flow temperature measuring means 7V Return fuel flow meter 7T Return fuel thermometer 8 Computer V1 Flow rate of supplied fuel T1 Temperature of supplied fuel V2 Return fuel Flow rate T2 Return fuel temperature Ta Predetermined temperature for predicting fuel consumption V1a V1 is corrected to flow rate at Ta based on the difference between T1 and Ta Flow rate V2a V2 is corrected based on the difference between T2 and Ta Fuel flow rate Vax consumed by the engine at Ta future fuel flow rate β Volume expansion rate of fuel X Regression line Y Extension line 13 Tank fuel amount measuring means T Engine operation at Ta time

Claims (9)

For driving an emergency generator, the fuel supply channel supplies fuel from a fuel tank to an engine for driving an emergency generator, and the return channel returns fuel not consumed by the engine to the fuel tank. A method for predicting fuel consumption of an engine of
The load test of the emergency power generator is performed a plurality of times at predetermined intervals, and the flow rate V1 and the temperature T1 of the supplied fuel flowing through the fuel supply passage are measured when the engine is driven during each load test. a step of measuring and storing a flow rate V2 and a temperature T2 of the return fuel flowing through the return passage;
The flow rate V1 is corrected to the flow rate V1a at the predetermined temperature Ta based on the difference between the temperature T1 and a predetermined temperature Ta when predicting the fuel consumption of the engine, and the flow rate V2 is corrected to the temperature T2. a step of correcting the flow rate V2a at the predetermined temperature Ta based on the difference from the predetermined temperature Ta;
a step of subtracting the flow rate V2a from the flow rate V1a to calculate the fuel flow rate Va consumed by the engine at the predetermined temperature Ta;
and predicting a future fuel flow rate Vax at the predetermined temperature Ta based on a plurality of changes in the fuel flow rate Va obtained by a plurality of load tests in the past. A fuel consumption prediction method for an engine for driving a generator. When correcting the flow rate V1 to the flow rate V1a at the predetermined temperature Ta based on the difference between the temperature T1 and the predetermined temperature Ta, the flow rate V1a is obtained using the following equation,
V1a=V1/(1+β(T1−Ta)) β: Volume expansion coefficient of fuel When correcting the flow rate V2 to the flow rate V2a at the predetermined temperature Ta based on the difference between the temperature T2 and the predetermined temperature Ta, Determine the flow rate V2a using the following formula,
V2a=V2/(1+β(T2−Ta)) β: volumetric expansion rate of fuel. The fuel consumption prediction method for an engine for driving an emergency power generator according to claim 1. When predicting the future fuel flow rate Vax at the predetermined temperature Ta based on a plurality of changes in the fuel flow rate Va obtained by a plurality of load tests in the past,
A regression line is obtained using the method of least squares from the plurality of fuel flow rates Va obtained by a plurality of load tests in the past, and the future fuel flow rate Vax at the predetermined temperature Ta is obtained by extending the regression line. 3. The fuel consumption prediction method for an emergency power generator driving engine according to claim 1 or 2, wherein the prediction is performed. A method for predicting the operating time of an emergency generator-driving engine using the fuel consumption prediction method for an emergency generator-driving engine according to any one of claims 1 to 3,
obtaining a fuel amount Vt stored in the fuel tank;
The fuel amount Vt is divided by the future fuel flow rate Vax at the predetermined temperature Ta predicted by the method for predicting fuel consumption of an engine for driving an emergency power generator according to any one of claims 1 to 3. and calculating the operating time of the engine at the predetermined temperature Ta. For driving an emergency generator, the fuel supply channel supplies fuel from a fuel tank to an engine for driving an emergency generator, and the return channel returns fuel not consumed by the engine to the fuel tank. A device for predicting the fuel consumption of an engine of
Supply fuel flow rate and temperature measurement means provided in the fuel supply passage for measuring the flow rate V1 and temperature T1 of the supply fuel flowing in the fuel supply passage; A return fuel flow rate temperature measurement means for measuring the flow rate V2 and temperature T2 of the flowing return fuel, and a computer connected to the return fuel flow rate temperature measurement means and the supplied fuel flow rate temperature measurement means,
The computer is
Load tests of the emergency power generator are performed a plurality of times at predetermined intervals, and when the engine is driven during each load test, the flow rate V1, the temperature T1, the flow rate V2, and the temperature T2 are stored, respectively. and the ability to
The flow rate V1 is corrected to the flow rate V1a at the predetermined temperature Ta based on the difference between the temperature T1 and a predetermined temperature Ta when predicting the fuel consumption of the engine, and the flow rate V2 is corrected to the temperature T2. A function of correcting the flow rate V2a at the predetermined temperature Ta based on the difference from the predetermined temperature Ta;
a function of subtracting the flow rate V2a from the flow rate V1a to calculate the fuel flow rate Va consumed by the engine at the predetermined temperature Ta;
and a function of predicting a future fuel flow rate Vax at the predetermined temperature Ta based on a plurality of changes in the fuel flow rate Va obtained by a plurality of load tests in the past. A fuel consumption prediction device for an engine for driving a generator. The supply fuel flow rate temperature measuring means is a supply fuel flow meter that is attached to the fuel supply flow path and measures the flow rate V1 of the fuel flowing through the fuel supply flow path, and the fuel supply flow near the supply fuel flow meter. a supply fuel thermometer attached to the passage and measuring the temperature T1 of fuel flowing through the fuel supply passage;
The return fuel flow rate temperature measuring means includes a return fuel flow meter that is attached to the return flow path and measures a flow rate V2 of fuel flowing through the return flow path, and a return fuel flow meter that is attached to the return flow path near the return fuel flow meter. and a return fuel thermometer for measuring a temperature T2 of the fuel flowing through the return flow path, and a fuel consumption predicting apparatus for an engine for driving an emergency power generator according to claim 5. . The computer is
When the flow rate V1 is corrected to the flow rate V1a at the predetermined temperature Ta based on the difference between the temperature T1 and the predetermined temperature Ta, the flow rate V1a is obtained using the following equation,
V1a=V1/(1+β(T1−Ta)) β: Volume expansion coefficient of fuel When correcting the flow rate V2 to the flow rate V2a at the predetermined temperature Ta based on the difference between the temperature T2 and the predetermined temperature Ta, Having a function to determine the flow rate V2a using the following formula,
V2a=V2/(1+β(T2−Ta)) β: Volumetric expansion rate of fuel. The apparatus for predicting fuel consumption of an engine for driving an emergency power generator according to claim 5 or 6. The computer is
When predicting the future fuel flow rate Vax at the predetermined temperature Ta based on a plurality of changes in the fuel flow rate Va obtained by a plurality of load tests in the past,
A regression line is obtained using the method of least squares from the plurality of fuel flow rates Va obtained by a plurality of load tests in the past, and the future fuel flow rate Vax at the predetermined temperature Ta is obtained by extending the regression line. 8. The fuel consumption prediction device for an emergency generator driving engine according to claim 5, further comprising a prediction function. A device for predicting the operating time of an engine for driving an emergency generator using the fuel consumption prediction device for an engine for driving an emergency generator according to any one of claims 5 to 8,
a tank fuel amount measuring means for determining the fuel amount Vt stored in the fuel tank;
The computer is
The fuel amount Vt is divided by the future fuel flow rate Vax at the predetermined temperature Ta predicted by the fuel consumption prediction device for the engine for driving the emergency power generator according to any one of claims 5 to 8. and a function of calculating the operating time of the engine at the predetermined temperature Ta.

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