Management device and management method

Abstract

To calculate accurately a CO2 emission amount per unit product for products produced on a mixed flow production line.SOLUTION: A control device calculates the CO2 emission amount Qtotal emitted from a production line 2 in a prescribed period by inputting a production line power consumption Etotal in the prescribed period into a conversion formula (S1, S2). The control device calculates each production weight Wasum, Wbsum which is the total weight of products 3, 4 produced on the production line in the prescribed period (S3-S5). The control device calculates each of the CO2 emission amount Qatotal, Qbtotal emitted from the production of the products 3, 4 in the prescribed period based on the weight ratio of the products 3, 4 produced in the prescribed period (S6). The control device calculates each of the unit CO2 emission amount Qa, Qb of the products 3, 4 produced in the prescribed period by dividing the amount of the CO2 emission Qatotal, Qbtotal by the production numbers Na, Nb 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 device for managing the CO2 emissions discharged by the production of products (hereinafter, also simply referred to as "CO2 emissions of products"), and a management method thereof.

Background Art

[0002] With the increasing awareness of environmental problems, the interest in the CO2 emissions discharged for producing products distributed in the market has been increasing. Therefore, in a company, 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). Since the weight may vary depending on the type of product, for example, in a factory, the amount of energy required to transport products using product transport vehicles, conveyors, etc. may differ. 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 device according to an aspect of the present disclosure is a management device that manages the 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 management device includes a storage device that stores the unit weights of the first product and the second product, and a control device that apportions the amount of power consumed on the production line during a predetermined period based on the weight ratio of the total weight of the first product and the total weight of the second product produced on the production line during the predetermined period, and calculates the CO2 emissions for each product.

[0008] According to the above configuration, the control device apportions the power consumption of the production line during a predetermined period based on the weight ratio of the total weight of the first product and the total weight of the second product produced on the production line during the predetermined period, and calculates the CO2 emissions per product, that is, the sum of the CO2 emissions of the first product produced during the predetermined period and the sum of the CO2 emissions of the second product produced during the predetermined period. By apportioning the power consumption of the production line consumed during the predetermined period based on the weight ratio, it is possible to calculate the CO2 emissions per product that reflect the weight of the product. 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 emission amount that is the sum of the CO2 emissions of the first product produced on the production line during a predetermined period and a second CO2 emission amount that is the sum of the CO2 emissions of the second product produced on the production line during the predetermined period. The control device divides the first CO2 emission amount by the production quantity of the first product during the predetermined period to calculate the CO2 emissions per unit product of the first product. The control device divides the second CO2 emission amount by the production quantity of the second product during the predetermined period to calculate the CO2 emissions per unit product of the second product.

[0010] According to the above configuration, by dividing the first CO2 emission amount 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 emission amount 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 storage device stores conversion information for converting power consumption into CO2 emissions. The control device uses the conversion information to convert the power consumption consumed on the production line during a predetermined period into CO2 emissions.

[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 method according to another aspect of the present disclosure is a management method for managing the CO2 emissions discharged by the production of products on a production line. On the production line, a first product and a second product are being produced. The management method includes a step of reading the unit weights of the first product and the second product, and a step of allocating the power consumption consumed on the production line during a predetermined period based on the weight ratio of the total weight of the first product and the total weight of the second product produced on the production line during the predetermined period, and calculating the CO2 emissions for each product.

Effect of the Invention

[0014] According to the present disclosure, for products produced on a 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

Embodiments 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 this 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 to, for example, factories and the like. In this embodiment, an example in which the management system 1 is applied to an automobile production factory of a certain company will be described. Note that the management system 1 is not limited to being applied to an automobile production factory, and can be applied to production factories of various products such as, for example, parts production factories and material production factories. That is, the type of product does not matter.

[0018] The management system 1 includes a production line 2, an electric power measuring instrument 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 this embodiment, two types of products, product 3 and product 4, are being produced on the production line 2. Product 3 and product 4 are vehicles. Product 3 and product 4 have different vehicle types. The production line 2 may be, for example, an assembly line for vehicles. 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 for each 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 image 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 transport 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 the devices related to the production of the products produced on the production line 2 and may not include the power for operating the devices related to the production of the products produced on other production lines.

[0022] Note that it is also possible to have at least one of the functions of the production quantity management device 7 and the power measuring device 5 in the management device 6. That is, the management device 6 may manage the production quantity of the 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 the downstream companies in the supply chain (companies that supply the products produced on production line 2) the amount of CO2 emissions required to produce the supplied products (the amount of 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 unit weight of the products produced on production line 2. The unit weight may be, for example, the weight defined in the product specification (hereinafter also referred to as the "specification weight"). That is, the storage device 62 stores the specification weight Wa of product 3 and the specification weight Wb of product 4.

[0026] The storage device 62 further stores a conversion formula (conversion information) for converting the power consumption into the amount of CO2 emissions. The conversion formula may be, for example, multiplying the power consumption by a CO2 emission coefficient. The CO2 emission coefficient is provided, for example, by a power utility (electric power company). The conversion formula is stored in the storage device 62. The conversion formula stored in the storage 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, for example, via the Internet or the like. Further, the communication device 63 is configured to be communicable with the production quantity management device 7 and the power measuring device 5. The communication between the communication device 63 and the production quantity management device 7 and the power measuring device 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 weight reading unit 614, a production weight 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 weight reading unit 614, the production weight 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, for example, a program stored in a memory. Note that the power consumption acquisition unit 611, the CO2 emission amount calculation unit 612, the production quantity acquisition unit 613, the weight reading unit 614, the production weight 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, for example, dedicated hardware (electronic circuit).

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

[0030] The CO2 emission amount calculation unit 612 reads out a conversion formula from the storage device 62. The CO2 emission amount calculation unit 612 inputs the total power consumption Etotal into the conversion formula and calculates the total CO2 emission amount Qtotal emitted in the production line 2 in a predetermined period. The CO2 emission amount calculation unit 612 outputs the CO2 emission amount Qtotal to the product-by-product CO2 emission amount 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 quantities Na and Nb to the weight reading unit 614. Note that the production quantity acquisition unit 613 may also output the production quantities Na and Nb to the production weight calculation unit 615.

[0032] The weight reading unit 614 reads the specification weight Wa of Product 3 and the specification weight Wb of Product 4 from the storage device 62. The weight reading unit 614 outputs the specification weights Wa, Wb and the production quantities Na, Nb to the production weight calculation unit 615.

[0033] The production weight calculation unit 615 calculates the production weight for each product during a predetermined period using the specification weights Wa, Wb and the production quantities Na, Nb. Specifically, the production weight calculation unit 615 multiplies the specification weight Wa by the production quantity Na to calculate the production weight Wasum, which is the total weight of Product 3 produced on the production line 2 during the predetermined period. The production weight calculation unit 615 multiplies the specification weight Wb by the production quantity Nb to calculate the production weight Wbsum, which is the total weight of Product 4 produced on the production line 2 during the predetermined period. The production weight calculation unit 615 outputs the production weights Wasum, Wbsum to the product-by-product CO2 emission calculation unit 616.

[0034] The product-by-product CO2 emission calculation unit 616 calculates the total CO2 emissions Qatotal emitted during the production of Product 3 and the total CO2 emissions Qbtotal emitted during the production of Product 4 during a predetermined period based on the weight ratio of Products 3 and 4 produced during the predetermined period. Specifically, the product-by-product CO2 emission calculation unit 616 calculates the total CO2 emissions Qatotal and Qbtotal by the following formulas (1) and (2), respectively.

[0035] Qatotal = Qtotal × Wasum / (Wasum + Wbsum) ··· (1) Qbtotal = Qtotal × Wbsum / (Wasum + Wbsum) ··· (2) The product - specific CO2 emission calculation unit 616 outputs the CO2 emissions Qatotal and Qbtotal to the unit CO2 emission calculation unit 617.

[0036] The unit CO2 emission calculation unit 617 calculates the unit CO2 emission Qa of product 3 produced in a predetermined period and the unit CO2 emission Qb of product 4 produced in a 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 the identification number of each 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 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 the identification number of each 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 CO2 emission Qball is updated. Note that the CO2 emissions Qapre and Qbpre are received as reports from upstream companies and are pre-stored in the storage device 62.

[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 product 3 from the storage device 62 using the identification number of product 3 delivered to the downstream company as a key. Then, the reporting unit 618 outputs a control signal for transmitting the CO2 emission amount Qaall of product 3 to the device of the downstream company together with the information for identifying product 3 delivered to the downstream company to the communication device 63. As a result, the information for identifying product 3 delivered to the downstream company and the information on the CO2 emission amount Qaall of product 3 are reported to the downstream company via the communication device 63. Note that the information for identifying 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 flowcharts 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 them may be realized by hardware (electric circuit) fabricated in the control device 6.

[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 specification weight Wa of the product 3 and the specification weight Wb of the product 4 from the storage device 62.

[0044] In S5, the control device 61 multiplies the specification weight Wa by the production quantity Na to calculate the production weight Wasum, which is the total weight of the product 3 produced on the production line 2 during a predetermined period. Further, the control device 61 multiplies the specification weight Wb by the production quantity Nb to calculate the production weight Wbsum, which is the total weight of the product 4 produced 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 weight ratio of the products 3 and 4 produced during the 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 each identification number 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 each identification number of the products 4 produced during a predetermined period. Thereby, 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 every predetermined cycle.

[0049] In S10, the control device 61 determines whether or not a 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 condition is satisfied (YES in S10), the process proceeds to S11. When the control device 61 determines that the 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 the information on the CO2 emission amount read in S11 to the device of the downstream company together with the information for specifying the target product (the product delivered to the downstream company). Thereby, the information for specifying 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 weight ratio of the products 3 and 4 produced on the production line 2 during a predetermined period, the total CO2 emission amount Qtotal discharged on the production line 2 during the predetermined period is allocated to the CO2 emission amount Qatotal discharged by the production of the product 3 and the CO2 emission amount Qbtotal discharged by the production of the product 4.

[0053] Since the amount of energy required to transport products using product transport vehicles, conveyors, etc. within the factory differs depending on the weight of the products, the amount of energy required for production differs for each type of product. Therefore, in a mixed-flow line that produces multiple products on the same production line, the unit CO2 emission amount for each type of product cannot be accurately calculated by a method that simply allocates the total CO2 emission amount Qtotal discharged on the production line 2 by the number of products produced.

[0054] In the management system 1 according to the present embodiment, the unit CO2 emission amount Qa of the product 3 and the unit CO2 emission amount Qb of the product 4 are calculated by dividing the CO2 emission amounts Qatotal and Qbtotal calculated based on the weight ratio of the products 3 and 4 produced on the production line 2 during a predetermined period by the production number Na of the product 3 and the production number Nb of the product 4 produced on the production line 2 during the predetermined period, respectively. Thereby, the unit CO2 emission amount for each product can be accurately calculated.

[0055] [Modification Example] It is also conceivable to form a consortium among companies included in the supply chain and share information among companies 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 companies. The management device 6 (node) transmits transaction data including the CO2 emissions of the target product to be reported to downstream companies to the distributed ledger network. By having the nodes of downstream companies approve this transaction data, the CO2 emissions of the target product are reported to the downstream companies. By reporting the CO2 emissions using distributed ledger technology, the tamper resistance of the information can be enhanced. In the modification example 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] The embodiments disclosed this time should be considered illustrative in all respects and not restrictive. The scope of the present disclosure is indicated by the claims rather than the above description, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Explanation of Reference Numerals

[0057] 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 Weight reading unit, 615 Production weight calculation unit, 616 Product-specific CO2 emissions calculation unit, 617 Unit CO2 emissions calculation unit, 618 Reporting unit.

Claims

1. A management device 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, a storage device for storing the unit weights of the first product and the second product; a control device that apportions the power consumption consumed on the production line during a predetermined period based on the weight ratio of the total weight of the first product and the total weight of the second product produced 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 sum 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 sum of the CO₂ emissions of the second product produced on the production line during the predetermined period, the control device, divides the first CO₂ emission by the number of production of the first product during the predetermined period to calculate a third CO₂ emission indicating the CO₂ emission per unit product of the first product, divides the second CO₂ emission by the number of production of the second product during the predetermined period to calculate a fourth CO₂ emission indicating the CO₂ emission per unit product of the second product, the storage device further stores a fifth CO₂ emission indicating the CO₂ emissions required for the procurement of raw materials of 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 of the components constituting the second product and the production and transportation of the components, the control device further, adds the third CO₂ emission to the fifth CO₂ emission to calculate a seventh CO₂ emission indicating the CO₂ emissions required to produce the first product, A management device that adds the fourth CO₂ emission to the sixth CO₂ emission to calculate an eighth CO₂ emission indicating the CO₂ emissions required to produce the second product.

2. The storage device stores conversion information for converting power consumption into CO₂ emissions, The control device uses the conversion information to convert the power consumption consumed on the production line during the predetermined period into CO₂ emissions. The management device according to claim 1.

3. 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, Step of reading out the unit weights of the first product and the second product; Step of allocating the amount of power consumed on the production line during a predetermined period based on the weight ratio of the total weight of the first product and the total weight of the second product produced 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 emission which is the sum of the CO2 emissions of the first product produced on the production line during the predetermined period, and a second CO2 emission which is the sum of the CO2 emissions of the second product produced on the production line during the predetermined period; The management method further includes: Step of dividing the first CO2 emission by the number of the first product produced during the predetermined period to calculate a third CO2 emission indicating the CO2 emission per unit of the first product; Step of dividing the second CO2 emission by the number of the second product produced during the predetermined period to calculate a fourth CO2 emission indicating the CO2 emission per unit of the second product; Step of adding the third CO2 emission to a fifth CO2 emission which is the CO2 emission required for procurement of raw materials for components constituting the first product and for production and transportation of the components, and which is obtained from an upstream company, to calculate a sixth CO2 emission indicating the CO2 emission required for producing the first product; Management method including: Step of adding the fourth CO2 emission to a seventh CO2 emission which is the CO2 emission required for procurement of raw materials for components constituting the second product and for production and transportation of the components, and which is obtained from an upstream company, to calculate an eighth CO2 emission indicating the CO2 emission required for producing the second product.

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