Management method and management device

Abstract

To calculate a CO2 emission amount per unit product with good accuracy, for the products produced on a mixed-flow line.SOLUTION: A control device inputs a power consumption amount Etotal of a production line in a prescribed period to a conversion formula, and calculates a CO2 emission amount Qtotal emitted from a production line 2 in the prescribed period (S1, 2). The control device calculates each of total work hours Tasum, and total work hours Tbsum that are the sum of work hours required for producing products 3, 4 on the production line in the prescribed period (S3-5). The control device calculates each of a CO2 emission amount Qatotal and a CO2 emission amount Qbtotal emitted from production of the products 3, 4 in the prescribed period on the basis of a ratio of the total work hours Tasum to the total work hours Tbsum (S6). The control device divides the CO2 emission amount Qatotal and the CO2 emission amount Qbtotal by production quantities Na, Nb of the products 3, 4 produced in the prescribed period and calculates a unit CO2 emission amount Qa and a unit CO2 emission amount Qb of the products 3, 4 produced in the prescribed period.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a management method for managing the CO2 emissions discharged by the production of products (hereinafter, also simply referred to as "CO2 emissions of products"), and a management device.

Background Art

[0002] With the increasing awareness of environmental issues, the interest in the CO2 emissions discharged for producing products distributed in the market has been growing. Therefore, in enterprises, the CO2 emissions discharged for producing products may be calculated and managed. For example, Japanese Patent Application Laid-Open No. 2016-126372 discloses a method for calculating the CO2 emissions in the transportation process of products (including materials and parts).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Among the CO2 emissions discharged for producing products, the CO2 emissions in the production process may be calculated based on the amount of energy consumed (i.e., the amount of electricity consumed) on the production line that produced the product. By dividing the CO2 emissions calculated based on the amount of energy consumed on the production line by the number of products produced, the CO2 emissions per unit product can be calculated.

[0005] Here, in the same production line, multiple types of products may be produced (mixed-flow production). Depending on the type of product, the time required for production (working time) in the production line may vary. Therefore, the amount of energy required for production may differ for each type of product. In such a case, with the above method, it is not possible to accurately calculate the CO2 emissions per unit product. Hereinafter, a production line in which multiple types of products are produced in the same production line is also referred to as a "mixed-flow line".

[0006] The present disclosure has been made to solve the above problems, and an object of the present disclosure is to accurately calculate the CO2 emissions per unit product for products produced on a mixed-flow line.

Means for Solving the Problems

[0007] (1) A management method according to an aspect of the present disclosure is a management method for managing CO2 emissions discharged by the production of products on a production line. In the production line, a first product and a second product are being produced. The method includes a step of obtaining the amount of power consumed on the production line during a predetermined period, and a step of allocating the power consumption amount based on the ratio of the total working time required to produce the first product on the production line during the predetermined period and the total working time required to produce the second product on the production line during the predetermined period, and calculating the CO2 emissions for each product.

[0008] According to the above configuration, by apportioning the power consumption of the production line during a predetermined period based on the ratio of the total working hours required to produce the first product on the production line during the predetermined period and the total working hours required to produce the second product on the production line during the predetermined period, the CO2 emissions per product, that is, the total CO2 emissions of the first product produced during the predetermined period and the total CO2 emissions of the second product produced during the predetermined period, are calculated. By apportioning the power consumption of the production line consumed during the predetermined period based on the ratio of the total working hours, it is possible to calculate the CO2 emissions per product that reflect the working hours. Then, for example, by dividing the calculated CO2 emissions per product by the respective production quantities produced on the above production line (mixed-flow line) during the predetermined period, it is possible to calculate the CO2 emissions per unit product for each product. Therefore, for the products produced on the mixed-flow line, the CO2 emissions per unit product can be accurately calculated.

[0009] (2) In a certain embodiment, the CO2 emissions per product include a first CO2 emissions which is the total CO2 emissions of the first product produced on the production line during a predetermined period, and a second CO2 emissions which is the total CO2 emissions of the second product produced on the production line during the predetermined period. The management method further includes a step of calculating the CO2 emissions per unit product of the first product by dividing the first CO2 emissions by the production quantity of the first product during the predetermined period, and a step of calculating the CO2 emissions per unit product of the second product by dividing the second CO2 emissions by the production quantity of the second product during the predetermined period.

[0010] According to the above configuration, by dividing the first CO2 emissions by the production quantity of the first product during the predetermined period, the CO2 emissions per unit product of the first product can be calculated, and by dividing the second CO2 emissions by the production quantity of the second product during the predetermined period, the CO2 emissions per unit product of the second product can be calculated. Therefore, for the products produced on the mixed-flow line, the CO2 emissions per unit product can be accurately calculated.

[0011] (3) In one embodiment, the management method further includes a step of reading conversion information for converting power consumption into CO2 emissions, and a step of converting the power consumption consumed on the production line during a predetermined period into CO2 emissions using the conversion information.

[0012] According to the above configuration, the power consumption consumed on the production line during a predetermined period can be appropriately converted into CO2 emissions.

[0013] (4) The management device according to another aspect of the present disclosure is a management device that manages the CO2 emissions discharged by the production of products on the production line. On the production line, the first product and the second product are being produced. The management device includes a storage device that stores the working time for producing the first product on the production line and the working time for producing the second product on the production line, and apportions the power consumption consumed on the production line during a predetermined period based on the ratio of the sum of the working times required to produce the first product on the production line during the predetermined period and the sum of the working times required to produce the second product on the production line during the predetermined period, and a control device that calculates the CO2 emissions for each product.

Advantages of the Invention

[0014] According to the present disclosure, for the products produced on the mixed-flow line, the CO2 emissions per unit product can be accurately calculated.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Best Mode for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and their description will not be repeated.

[0017] FIG. 1 is an overall configuration diagram of a management system 1 according to the present embodiment. The management system 1 is a system for managing the CO2 emissions discharged by the production of products. The management system 1 is applied, for example, to factories and the like. In the present embodiment, an example in which the management system 1 is applied to a production factory that produces parts will be described. Note that the management system 1 is not limited to being applied to a parts production factory, and can be applied to production factories of various products such as, for example, a finished product production factory and a raw material production factory. That is, the type of product does not matter.

[0018] The management system 1 includes a production line 2, an electricity meter 5, a management device 6, and a production quantity management device 7. The management system 1 manages the CO2 emissions of the products produced on the production line 2.

[0019] On the production line 2, multiple types of products are being produced. That is, the production line 2 is a mixed-flow line. In the present embodiment, two types of products, product 3 and product 4, are being produced on the production line 2. Product 3 and product 4 are, for example, parts for automobiles. Product 3 and product 4 are different types of parts. On the production line 2, product 3 and product 4 are produced using, for example, different materials. In the present embodiment, the time required to produce product 3 on the production line 2 and the time required to produce product 4 on the production line 2 are different. Note that the number of types of products produced on the production line 2 is not limited to two. The number of types of products produced on the production line 2 may be three or more.

[0020] The production quantity management device 7 totals the production quantities of products for each type of product every predetermined period. The predetermined period is, for example, 24 hours. Note that the predetermined period is not limited to 24 hours and can be set as appropriate. The production quantity management device 7 totals the production quantity Na of product 3 and the production quantity Nb of product 4 in the predetermined period. The production quantity management device 7 may include, for example, an imaging device and total the production quantity of products by analyzing the images captured by the imaging device. Also, the production quantity management device 7 may include, for example, an input device and total the production quantity of products based on the operator's input to the input device. The production quantity management device 7 transmits the production quantity Na of product 3 and the production quantity Nb of product 4 in the predetermined period to the management device 6 at a predetermined timing.

[0021] The power measuring device 5 measures the amount of power consumed (power consumption) on the production line 2. The power measuring device 5 measures the power consumed on the production line 2 and calculates the total power consumption Etotal consumed on the production line 2 in a predetermined period. The power measuring device 5 transmits the total power consumption Etotal to the management device 6 at a predetermined timing. The power consumed on the production line 2 may be, for example, the power consumed in the factory building where the production line 2 is laid. The power consumed in the factory building may include, for example, the power for operating all devices related to the production of products, such as air conditioning, lighting, component transfer vehicles (forklifts, etc.), the conveyor of the production line 2, impact wrenches, and assembly devices. For example, when there are multiple production lines laid in the factory building, the power consumed on the production line 2 may include the power for operating devices related to the production of products produced on the production line 2 and may not include the power for operating devices related to the production of products produced on other production lines.

[0022] Note that it is also possible to have the management device 6 perform at least one of the functions of the production quantity management device 7 and the power measuring device 5. That is, the management device 6 may manage the production quantity of products produced on the production line 2, or the management device 6 may measure the total power consumption consumed on the production line 2.

[0023] The management device 6 reports to downstream companies in the supply chain (companies that supply the products produced on production line 2) the CO2 emissions required to produce the supplied products (the CO2 emissions emitted by the production of the supplied products). The management device 6 includes a control device 61, a storage device 62, and a communication device 63. The control device 61, the storage device 62, and the communication device 63 are connected to a bus 64.

[0024] The control device 61 is configured to include, for example, a CPU (Central Processing Unit), a memory, and an input / output port through which various signals are input and output (none of which are shown in the figure). The control device 61 executes various programs stored in the memory. The various programs include an operating system and the like. The memory is configured to include, for example, a ROM (Read Only Memory) that stores the above various programs, and a RAM (Random Access Memory) that functions as a working memory and temporarily stores various data necessary for the execution of the various programs.

[0025] The storage device 62 is configured to be able to store various information. The storage device 62 stores information on the working time of the products produced on production line 2. The working time is a predetermined time for producing one product on production line 2. The working time is predetermined for each type of product based on the production man-hours of the product and the like. As the working time, for example, cycle time or tact time may be adopted. In the present embodiment, the storage device 62 stores the working time Ta for producing product 3 (hereinafter, also simply referred to as "working time Ta of product 3"), and the working time Tb for producing product 4 (hereinafter, also simply referred to as "working time Tb of product 4").

[0026] The memory device 62 further stores a conversion formula (conversion information) for converting the power consumption into the CO2 emission amount. The conversion formula may be, for example, one that multiplies the power consumption by a CO2 emission coefficient. The CO2 emission coefficient is provided, for example, by a power utility company. The conversion formula is stored in the memory device 62. The conversion formula stored in the memory device 62 is updated by the control device 61, for example, as the CO2 emission coefficient is updated.

[0027] The communication device 63 is configured to be communicable with a device (not shown) of a downstream company in the supply chain. The communication between the communication device 63 and the device of the downstream company is performed via, for example, the Internet or the like. Also, the communication device 63 is configured to be communicable with the production quantity management device 7 and the power meter 5. The communication between the communication device 63 and the production quantity management device 7 and the power meter 5 may be wired communication or wireless communication.

[0028] Figure 2 is a functional block diagram of the control device 61 included in the management device 6. The control device 61 includes a power consumption acquisition unit 611, a CO2 emission amount calculation unit 612, a production quantity acquisition unit 613, a working time reading unit 614, a total working time calculation unit 615, a product-by-product CO2 emission amount calculation unit 616, a unit CO2 emission amount calculation unit 617, and a reporting unit 618. The control device 61 functions as the power consumption acquisition unit 611, the CO2 emission amount calculation unit 612, the production quantity acquisition unit 613, the working time reading unit 614, the total working time calculation unit 615, the product-by-product CO2 emission amount calculation unit 616, the unit CO2 emission amount calculation unit 617, and the reporting unit 618 by executing a program stored in a memory, for example. Note that the power consumption acquisition unit 611, the CO2 emission amount calculation unit 612, the production quantity acquisition unit 613, the working time reading unit 614, the total working time calculation unit 615, the product-by-product CO2 emission amount calculation unit 616, the unit CO2 emission amount calculation unit 617, and the reporting unit 618 may be realized by dedicated hardware (electronic circuit), for example.

[0029] The power consumption acquisition unit 611 acquires the total power consumption Etotal of the production line 2 during a predetermined period from the power meter 5. The power consumption acquisition unit 611 outputs the total power consumption Etotal to the CO2 emission calculation unit 612.

[0030] The CO2 emission calculation unit 612 reads out the conversion formula from the storage device 62. The CO2 emission calculation unit 612 inputs the total power consumption Etotal into the conversion formula and calculates the total CO2 emissions Qtotal emitted by the production line 2 during a predetermined period. The CO2 emission calculation unit 612 outputs the total CO2 emissions Qtotal to the product-specific CO2 emission calculation unit 616.

[0031] The production quantity acquisition unit 613 acquires the production quantities of each product (product 3 and product 4) produced on the production line 2 during a predetermined period from the production quantity management device 7. Specifically, the production quantity acquisition unit 613 acquires the production quantity Na of product 3 and the production quantity Nb of product 4 from the production quantity management device 7. The production quantity acquisition unit 613 outputs the production quantity Na and the production quantity Nb to the working time reading unit 614. Note that the production quantity acquisition unit 613 may output the production quantity Na and the production quantity Nb to the total working time calculation unit 615.

[0032] The working time reading unit 614 reads out the working time Ta of product 3 and the working time Tb of product 4 from the storage device 62. The working time reading unit 614 outputs the working times Ta, Tb and the production quantities Na, Nb to the total working time calculation unit 615.

[0033] The total working time calculation unit 615 calculates the total working time, which is the sum of the working times for each product over a predetermined period, using the working times Ta, Tb and the production quantities Na, Nb. Specifically, the total working time calculation unit 615 multiplies the working time Ta by the production quantity Na to calculate the total working time Tasum, which is the sum of the working times required to produce product 3 on production line 2 during the predetermined period. The total working time calculation unit 615 multiplies the working time Tb by the production quantity Nb to calculate the total working time Tbsum, which is the sum of the working times required to produce product 4 on production line 2 during the predetermined period. The total working time calculation unit 615 outputs the total working times Tasum, Tbsum to the product-specific CO2 emission calculation unit 616.

[0034] Based on the ratios of the total working times Tasum, Tbsum required to produce products 3 and 4 during the predetermined period, the product-specific CO2 emission calculation unit 616 calculates the CO2 emission quantity Qatotal emitted by the production of product 3 during the predetermined period and the CO2 emission quantity Qbtotal emitted by the production of product 4 during the predetermined period. Specifically, the product-specific CO2 emission calculation unit 616 calculates the CO2 emission quantities Qatotal and Qbtotal according to the following formulas (1) and (2), respectively.

[0035] Qatotal = Qtotal × Tasum / (Tasum + Tbsum) ··· (1) Qbtotal = Qtotal × Tbsum / (Tasum + Tbsum) ··· (2) The product-specific CO2 emission calculation unit 616 outputs the CO2 emission quantities Qatotal, Qbtotal to the unit CO2 emission calculation unit 617. The product-specific CO2 emission calculation unit 616 may store the CO2 emission quantities Qatotal, Qbtotal in the storage device 62.

[0036] The unit CO2 emission calculation unit 617 calculates the unit CO2 emission Qa of product 3 produced during a predetermined period and the unit CO2 emission Qb of product 4 produced during the predetermined period. The unit CO2 emission is the CO2 emission per unit product. Specifically, the unit CO2 emission Qa is the CO2 emission per unit of product 3 (per one product 3). The unit CO2 emission Qb is the CO2 emission per unit of product 4 (per one product 4). The unit CO2 emission calculation unit 617 calculates the unit CO2 emissions Qa and Qb by the following formulas (3) and (4), respectively.

[0037] Qa = Qatotal / Na ··· (3) Qb = Qbtotal / Nb ··· (4) Each of the products 3 produced on production line 2 is assigned an identification number. The unit CO2 emission calculation unit 617 associates the unit CO2 emission Qa with each identification number of the products 3 produced on production line 2 and stores it in the storage device 62. The storage device 62 stores the total CO2 emission Qaall required to produce the product 3 (single unit). The total CO2 emission Qaall required to produce the product 3 (single unit) is calculated by adding the unit CO2 emission Qa to the CO2 emission Qapre required for procuring the raw materials of the components constituting the product 3 and for producing and transporting those components. By the unit CO2 emission calculation unit 617 storing the unit CO2 emission Qa in the storage device 62, the unit CO2 emission Qa is added to the CO2 emission Qapre, and the CO2 emission Qaall is updated. Also, each of the products 4 produced on production line 2 is assigned an identification number. The unit CO2 emission calculation unit 617 associates the unit CO2 emission Qb with each identification number of the products 4 produced on production line 2 and stores it in the storage device 62. The storage device 62 stores the total CO2 emission Qball required to produce the product 4 (single unit). The total CO2 emission Qball required to produce the product 4 (single unit) is calculated by adding the unit CO2 emission Qb to the CO2 emission Qbpre required for procuring the raw materials of the components constituting the product 4 and for producing and transporting those components. By the unit CO2 emission calculation unit 617 storing the unit CO2 emission Qb in the storage device 62, the unit CO2 emission Qb is added to the CO2 emission Qbpre, and the CO2 emission Qball is updated. Note that the CO2 emissions Qapre and Qbpre are reported by upstream companies and stored in the storage device 62 in advance.

[0038] For example, assume that product 3 is delivered to a downstream company. In this case, in response to the requirements from the downstream company or triggered by the delivery of product 3, the reporting unit 618 reads out the CO2 emission amount Qaall of the product 3 delivered to the downstream company from the storage device 62 using the identification number of the product 3 as a key. Then, the reporting unit 618 outputs a control signal for transmitting the CO2 emission amount Qaall of the product 3 to the device of the downstream company together with the information for identifying the product 3 delivered to the downstream company to the communication device 63. As a result, the information for identifying the product 3 delivered to the downstream company and the information on the CO2 emission amount Qaall of the product 3 are reported to the downstream company via the communication device 63. Note that the information for identifying the product 3 delivered to the downstream company may be any information that enables the downstream company to identify which product the reported CO2 emission amount Qaall belongs to. For example, it may be the above-mentioned identification number or the delivery number described in the delivery slip or the like.

[0039] Figure 3 is a flowchart showing the procedure of a process for calculating the unit CO2 emission amount, which is executed by the control device 61 included in the management device 6. This flowchart is started by the control device 61 when the first condition is satisfied. The first condition may be, for example, that a predetermined period has elapsed since the execution of the previous process. For example, when the predetermined period is 24 hours, the elapse of one day (for example, the change of the date) can be set as the first condition. Each step (hereinafter, the step is abbreviated as "S") of the flowchart shown in Figure 3 and Figure 4 described later will be described for the case where it is realized by software processing by the control device 61, but a part or all of it may be realized by hardware (electric circuit) fabricated in the control device 61.

[0040] In S1, the control device 61 acquires the total power consumption Etotal of the production line 2 in a predetermined period from the power meter 5.

[0041] In S2, the control device 61 reads out the conversion formula from the storage device 62, inputs the total power consumption Etotal into the conversion formula, and calculates the CO2 emission amount Qtotal discharged on the production line 2 during a predetermined period.

[0042] In S3, the control device 61 acquires the production quantity Na of the product 3 and the production quantity Nb of the product 4 produced on the production line 2 during a predetermined period from the production quantity management device 7.

[0043] In S4, the control device 61 reads out the working time Ta of the product 3 and the working time Tb of the product 4 from the storage device 62.

[0044] In S5, the control device 61 multiplies the working time Ta by the production quantity Na to calculate the total working time Tasum, which is the sum of the working times required to produce the product 3 on the production line 2 during a predetermined period. Further, the control device 61 multiplies the working time Tb by the production quantity Nb to calculate the total working time Tbsum, which is the sum of the working times required to produce the product 4 on the production line 2 during a predetermined period.

[0045] In S6, the control device 61 calculates the CO2 emission amount Qatotal discharged by the production of the product 3 during a predetermined period and the CO2 emission amount Qbtotal discharged by the production of the product 4 during a predetermined period based on the ratio of the total working times Tasum and Tbsum required to produce the products 3 and 4 on the production line 2 during a predetermined period. The control device 61 calculates the CO2 emission amounts Qatotal and Qbtotal according to the above formulas (1) and (2), respectively.

[0046] In S7, the control device 61 calculates the unit CO2 emission amount Qa of the product 3 produced during a predetermined period and the unit CO2 emission amount Qb of the product 4 produced during a predetermined period. The control device 61 calculates the unit CO2 emission amounts Qa and Qb according to the above formulas (3) and (4), respectively.

[0047] In S8, the control device 61 causes the storage device 62 to store the unit CO2 emission amount Qa in association with the identification number of each of the products 3 produced during a predetermined period. Further, the control device 61 causes the storage device 62 to store the unit CO2 emission amount Qb in association with the identification number of each of the products 4 produced during a predetermined period. As a result, the CO2 emission amount Qaall of the product 3 and the CO2 emission amount Qball of the product 4 are updated.

[0048] FIG. 4 is a flowchart showing a procedure of a process for reporting the unit CO2 emission amount, which is executed by the control device 61 included in the management device 6. This flowchart is repeatedly executed by the control device 61 at predetermined intervals.

[0049] In S10, the control device 61 determines whether the second condition is satisfied. The second condition may be, for example, at least any one of (i) the product produced on the production line 2 has been delivered to a downstream company, and (ii) the product produced on the production line 2 has been delivered to a downstream company and an information disclosure of the CO2 emission amount of the product (target product) delivered from the downstream company has been requested. When the control device 61 determines that the second condition is satisfied (YES in S10), the process proceeds to S11. When the control device 61 determines that the second condition is not satisfied (NO in S10), the process returns.

[0050] In S11, the control device 61 reads out the CO2 emission amount of the product (target product) from the storage device 62 using the identification number of the target product as a key.

[0051] In S12, the control device 61 outputs, to the communication device 63, a control signal for transmitting, to the device of the downstream company, the information on the CO2 emission amount read in S11 together with the information for identifying the target product (the product delivered to the downstream company). As a result, the information for identifying the target product and the information on the CO2 emission amount of the product are transmitted to the downstream company via the communication device 63.

[0052] As described above, in the management system 1 according to the present embodiment, based on the ratio of the total working hours Tasum and Tbsum required to produce the products 3 and 4 on the production line 2 during a predetermined period, the total CO2 emissions Qtotal discharged from the production line 2 during the predetermined period are allocated to the CO2 emissions Qatotal discharged by the production of product 3 and the CO2 emissions Qbtotal discharged by the production of product 4.

[0053] Since the time (working hours) required for production varies depending on the type of product, the amount of energy required for production also varies for each type of product. Therefore, in a mixed-flow line that produces multiple products on the same production line, in a method of simply allocating the total CO2 emissions Qtotal discharged from the production line 2 by the production quantity, the unit CO2 emissions for each type of product cannot be accurately calculated.

[0054] In the management system 1 according to the present embodiment, the CO2 emissions Qatotal and Qbtotal calculated based on the ratio of the total working hours Tasum and Tbsum required to produce the products 3 and 4 on the production line 2 during a predetermined period are divided by the production quantity Na of product 3 and the production quantity Nb of product 4 produced on the production line 2 during the predetermined period, respectively, to calculate the unit CO2 emissions Qa of product 3 and the unit CO2 emissions Qb of product 4. Thereby, the unit CO2 emissions for each product can be accurately calculated.

[0055] [Modification Example 1] It is also conceivable to form a consortium among the enterprises included in the supply chain and share information among the enterprises using distributed ledger technology. In this case, the management device 6 may function as a node to form a distributed ledger network with the nodes of downstream enterprises. The management device 6 (node) transmits transaction data including information on the CO2 emissions of the target product to be reported to downstream enterprises to the distributed ledger network. By having the nodes of downstream enterprises approve this transaction data, the CO2 emissions of the target product are reported to the downstream enterprises. By reporting the CO2 emissions using distributed ledger technology, the tamper resistance of the information can be enhanced. In addition, in Modification Example 1 as well, the unit CO2 emissions may be calculated and the CO2 emissions of the product may be calculated by the same method as in the embodiment.

[0056] [Modification Example 2] In the embodiment and Modification Example 1, an example was described in which a predetermined time (for example, takt time) for producing one product on production line 2 was adopted as the working time. However, the working time is not limited to the predetermined time. It is also possible to adopt the time actually required for product production (for example, cycle time) on production line 2 as the working time.

[0057] In this case, the production quantity management device 7 aggregates the production quantity of products for each product type for each predetermined period and stores the time required for production for each product. The management device 6 (control device 61) acquires the time required for production for each product from the production quantity management device 7, aggregates these for each product type, and calculates the total working times Tasum and Tbsum. The control device 61 divides the total working times Tasum and Tbsum by the production quantities Na and Nb acquired from the production quantity management device 7, respectively. Thereby, the control device 61 calculates the working times Ta and Tb per one of products 3 and 4, respectively, and stores them in the storage device 62.

[0058] As described in the embodiment, the management device 6 calculates the CO2 emissions Qatotal and Qbtotal using the above-described formulas (1) and (2) (in other words, calculates the CO2 emissions Qatotal and Qbtotal calculated based on the ratios of the total working hours Tasum and Tbsum required to produce the products 3 and 4 on the production line 2 during a predetermined period). The management device 6 divides the CO2 emissions Qatotal and Qbtotal by the production quantity Na of the product 3 and the production quantity Nb of the product 4 produced on the production line 2 during a predetermined period, respectively, to calculate the unit CO2 emissions Qa of the product 3 and the unit CO2 emissions Qb of the product 4.

[0059] Thus, even if the configuration according to the second modification is adopted, the same effects as those of the embodiment can be achieved. Note that the second modification can also be combined with the first modification.

[0060] The disclosed embodiments should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is shown not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims be included.

Explanation of Reference Numerals

[0061] 1 Management system, 2 Production line, 3, 4 Products, 5 Power measuring instrument, 6 Management device, 7 Production quantity management device, 61 Control device, 62 Storage device, 63 Communication device, 64 Bus, 611 Power consumption acquisition unit, 612 CO2 emissions calculation unit, 613 Production quantity acquisition unit, 614 Working hour reading unit, 615 Total working hour calculation unit, 616 Product-specific CO2 emissions calculation unit, 617 Unit CO2 emissions calculation unit, 618 Reporting unit.

Claims

1. A management method for managing the CO₂ emissions discharged by the production of products on a production line, wherein in the production line, a first product and a second product are produced, obtaining the amount of power consumed on the production line during a predetermined period; allocating the power consumption based on the ratio of the total working hours required to produce the first product on the production line during the predetermined period and the total working hours required to produce the second product on the production line during the predetermined period, and calculating the CO₂ emissions for each product; The CO₂ emissions for each product include a first CO₂ emissions which is the total CO₂ emissions of the first product produced on the production line during the predetermined period, and a second CO₂ emissions which is the total CO₂ emissions of the second product produced on the production line during the predetermined period, The management method further includes dividing the first CO₂ emissions by the number of the first products produced during the predetermined period to calculate a third CO₂ emissions indicating the CO₂ emissions per unit product of the first product; dividing the second CO₂ emissions by the number of the second products produced during the predetermined period to calculate a fourth CO₂ emissions indicating the CO₂ emissions per unit product of the second product; adding the third CO₂ emissions to the fifth CO₂ emissions which is the CO₂ emissions required for the procurement of raw materials of the parts constituting the first product and the production and transportation of the parts and obtained from upstream enterprises, to calculate a sixth CO₂ emissions indicating the CO₂ emissions required to produce the first product; adding the fourth CO₂ emissions to the seventh CO₂ emissions which is the CO₂ emissions required for the procurement of raw materials of the parts constituting the second product and the production and transportation of the parts and obtained from upstream enterprises, to calculate an eighth CO₂ emissions indicating the CO₂ emissions required to produce the second product. A management method.

2. A step of reading conversion information for converting power consumption into CO2 emissions, and The management method according to claim 1, further comprising a step of converting the power consumption consumed in the production line during the predetermined period into CO2 emissions using the conversion information.

3. A management device for managing CO2 emissions discharged by the production of products on a production line, wherein in the production line, a first product and a second product are being produced, A storage device that stores the working time required to produce the first product on the production line and the working time required to produce the second product on the production line, A control device that apportions the power consumption consumed in the production line during a predetermined period based on the ratio of the total working time required to produce the first product on the production line during the predetermined period and the total working time required to produce the second product on the production line during the predetermined period, and calculates the CO2 emissions for each product, The CO2 emissions for each product include a first CO2 emission that is the total of the CO2 emissions of the first product produced on the production line during the predetermined period and a second CO2 emission that is the total of the CO2 emissions of the second product produced on the production line during the predetermined period, The control device, Calculates a third CO2 emission indicating the CO2 emission per unit product of the first product by dividing the first CO2 emission by the number of the first product produced during the predetermined period, Calculates a fourth CO2 emission indicating the CO2 emission per unit product of the second product by dividing the second CO2 emission by the number of the second product produced during the predetermined period, The storage device further stores a fifth CO2 emission indicating the CO2 emissions required for the procurement of raw materials for the components constituting the first product and the production and transportation of the components, and a sixth CO2 emission indicating the CO2 emissions required for the procurement of raw materials for the components constituting the second product and the production and transportation of the components, The control device further, Add the third CO₂ emission amount to the fifth CO₂ emission amount to calculate a seventh CO₂ emission amount indicating the CO₂ emission amount required to produce the first product. A management device that adds the fourth CO₂ emission amount to the sixth CO₂ emission amount to calculate an eighth CO₂ emission amount indicating the CO₂ emission amount required to produce the second product.

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