Emissions calculation method, program, and emissions calculation system

Abstract

Provided is an emission amount calculation method involving acquiring, using a second server (12) (management system (200)), charge information relating to charge of a storage battery (22) of an electric vehicle (2) through use of first electric power derived from renewable energy and charge of the storage battery (22) through use of second electric power derived from system electric power. The emission amount calculation method also involves calculating, using the second server (12), a ratio of a charge electric power amount through use of the first electric power to a charge electric power amount of the storage battery (22) on the basis of the charge information. The emission amount calculation method also involves calculating, using the second server (12), an emission amount of the carbon dioxide in the electric vehicle (2) on the basis of said ratio, a first emission coefficient of the carbon dioxide relating to the renewable energy, and a second emission coefficient of the carbon dioxide relating to the system electric power. The emission amount calculation method also involves outputting the emission amount of the carbon dioxide.

Description

Technical Field

[0001] The present invention relates to an emission amount calculation method and the like for calculating the emission amount of carbon dioxide emitted by an electric vehicle.

Background Art

[0002] Patent Document 1 discloses a system that assigns eco points according to the amount of CO2 (carbon dioxide) reduction. In this system, the amount of electric power used for charging is obtained, the obtained amount of electric power is multiplied by the driving distance of an electric vehicle per 1 kWh, and the estimated driving distance of the electric vehicle is calculated. Then, in this system, the amount of CO2 reduction is calculated by multiplying the estimated driving distance by the amount of CO2 reduction per 1 km.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present invention provides an emission amount calculation method and the like that can accurately and easily obtain the emission amount of carbon dioxide during the running of an electric vehicle.

Means for Solving the Problems

[0005] In one embodiment of the present invention, an emission calculation method is obtained from at least one of the electric vehicle and the management system that manages the electric vehicle, regarding the charging of the electric vehicle's battery with a first power source derived from renewable energy and the charging of the electric vehicle's battery with a second power source derived from grid power. The emission calculation method also calculates, based on the charging information, the ratio of the amount of electricity charged with the first power source to the amount of electricity charged to the battery, from at least one of the electric vehicle and the management system. The emission calculation method also calculates the amount of carbon dioxide emissions from the electric vehicle based on the ratio, a first emission factor which is the carbon dioxide emission factor for renewable energy, and a second emission factor which is the carbon dioxide emission factor for grid power, from at least one of the electric vehicle and the management system. The emission calculation method also outputs the amount of carbon dioxide emissions.

[0006] In one embodiment of the present invention, an emission calculation method is obtained from at least one of the electric vehicle and the management system that manages the electric vehicle, including charging information relating to the charging of the electric vehicle's battery with a first power source derived from renewable energy and the charging of the battery with a second power source derived from grid power, as well as the amount of electricity consumed by the electric vehicle during its operation. The emission calculation method also calculates the ratio of the amount of electricity charged with the first power source to the amount of electricity charged to the battery, based on the charging information, from at least one of the electric vehicle and the management system. The emission calculation method also calculates the amount of carbon dioxide emissions from the electric vehicle based on the ratio, a first emission factor which is the carbon dioxide emission factor for renewable energy, a second emission factor which is the carbon dioxide emission factor for grid power, and the amount of electricity consumed by the electric vehicle during its operation, from at least one of the electric vehicle and the management system. The emission calculation method also outputs the amount of carbon dioxide emissions.

[0007] A program according to one aspect of the present invention causes one or more processors to execute the emission calculation method.

[0008] An emissions calculation system according to one aspect of the present invention is an emissions calculation system provided for either an electric vehicle or a management system for managing the electric vehicle. The emissions calculation system comprises an acquisition unit, a first calculation unit, a second calculation unit, and an output unit. The acquisition unit acquires charging information relating to the charging of the electric vehicle's battery with a first power source derived from renewable energy and the charging of the battery with a second power source derived from grid power. The first calculation unit calculates the ratio of the amount of electricity charged with the first power source to the amount of electricity charged with the battery based on the charging information. The second calculation unit calculates the amount of carbon dioxide emissions from the electric vehicle based on the ratio, a first emission factor which is the carbon dioxide emission factor for renewable energy, and a second emission factor which is the carbon dioxide emission factor for grid power. The output unit outputs the amount of carbon dioxide emissions.

[0009] An emission calculation system according to one aspect of the present invention is an emission calculation system provided for either an electric vehicle or a management system for managing the electric vehicle. The emission calculation system comprises an acquisition unit, a first calculation unit, a second calculation unit, and an output unit. The acquisition unit acquires charging information relating to the charging of the electric vehicle's battery with a first power source derived from renewable energy and the charging of the battery with a second power source derived from grid power, as well as the amount of electricity consumed by the electric vehicle during operation. The first calculation unit calculates the ratio of the amount of electricity charged with the first power source to the amount of electricity charged to the battery based on the charging information. The second calculation unit calculates the amount of carbon dioxide emissions from the electric vehicle based on the ratio, a first emission factor which is the carbon dioxide emission factor for renewable energy, a second emission factor which is the carbon dioxide emission factor for grid power, and the amount of electricity consumed by the electric vehicle during operation. The output unit outputs the amount of carbon dioxide emissions. [Effects of the Invention]

[0010] The emission calculation method of the present invention has the advantage of making it easy to accurately determine the amount of carbon dioxide emitted when an electric vehicle is running. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a block diagram showing the overall configuration including the emissions calculation system according to the embodiment. [Figure 2] Figure 2 shows an example of charging information. [Figure 3] Figure 3 shows an example of the charging history of a battery in an electric vehicle. [Figure 4] Figure 4 shows an example of emissions information. [Figure 5] Figure 5 shows an example of the breakdown of power consumption in the battery of an electric vehicle. [Figure 6] Figure 6 is a sequence diagram showing an example of the operation of the emissions calculation system according to the embodiment. [Modes for carrying out the invention]

[0012] (Embodiment) [1.Technical background] First, we will explain the technical background that led to the invention of the emission calculation method and emission calculation system according to the embodiment. In order to achieve carbon neutrality, which means reducing carbon dioxide emissions to virtually zero, it is necessary to reduce carbon dioxide emissions when electric vehicles are in operation. In particular, for companies that manufacture electric vehicles, reducing carbon dioxide emissions when electric vehicles are in use, i.e., when they are running, is an important issue in order to reduce supply chain emissions under the GHG (Greenhouse Gas) protocol.

[0013] Here, if the rechargeable battery of an electric vehicle is charged using power derived from renewable energy with a low carbon dioxide emission, it is possible to reduce the carbon dioxide emissions during the operation of the electric vehicle. However, the rechargeable battery of an electric vehicle is not always charged only with power derived from renewable energy, and may be charged with power derived from grid power. Therefore, if it is not possible to grasp with what kind of power source the rechargeable battery of an electric vehicle is charged, there is a problem that the carbon dioxide emissions during the operation of the electric vehicle cannot be accurately determined.

[0014] Also, if the carbon dioxide emissions during the operation of an electric vehicle cannot be accurately determined, there is also a problem that incentives for promoting the popularization of electric vehicles and investment in the introduction of renewable energy are less likely to arise. Furthermore, if the carbon dioxide emissions during the operation of an electric vehicle cannot be accurately determined, there is also a problem that the corporate efforts to reduce carbon dioxide emissions are less likely to be reflected in the degree of reduction of carbon dioxide emissions.

[0015] In view of the above, the inventor has come up with the present invention.

[0016] Hereinafter, embodiments will be specifically described with reference to the drawings. Note that each of the embodiments described below shows comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, steps, order of steps, etc. shown in the following embodiments are merely examples and are not intended to limit the present invention. In addition, among the components in the following embodiments, the components not described in the independent claims are described as optional components.

[0017] Note that each figure is a schematic diagram and is not necessarily drawn precisely. Also, in each figure, the same reference numerals are given to substantially the same configurations, and duplicate explanations may be omitted or simplified.

[0018] [2. Configuration] Next, the overall configuration including the emission amount calculation system according to the embodiment will be described with reference to FIG. 1. FIG. 1 is a block diagram showing the overall configuration including the emission amount calculation system 100 according to the embodiment.

[0019] In the embodiment, as shown in FIG. 1, the emission amount calculation system 100 is realized by the second server 12. The second server 12 is configured to be communicable with each of the first server 11 and the electric vehicle 2 via a network N1 such as the Internet.

[0020] The first server 11 is a server that manages the energy management system 35 by communicating with the energy management system 35 installed in the facility 3 via the network N1. In the example shown in FIG. 1, the first server 11 communicates with one energy management system 35 installed in the facility 3. However, when there are a plurality of facilities 3, the first server 11 communicates with each of the plurality of energy management systems 35 installed in each of the plurality of facilities 3. In this case, the first server 11 manages the plurality of energy management systems 35. In the following description, one energy management system 35 managed by the first server 11 will be described in focus.

[0021] The first server 11 includes a first communication unit 111, a first processing unit 112, and a first storage unit 113.

[0022] The first communication unit 111 is a communication module (communication circuit) that communicates with an external system via the network N1. In the embodiment, the first communication unit 111 communicates with the second communication unit 121 of the second server 12 as an external system via the network N1. The first communication unit 111 also communicates with the energy management system 35 as an external system via the network N1. Thereby, the first communication unit 111 acquires the charging information periodically transmitted from the energy management system 35.

[0023] The charging information is information relating to the charging of the battery 22 of the electric vehicle 2. Specifically, the charging information is information relating to the charging of the battery 22 of the electric vehicle 2 with a first power source derived from renewable energy, and the charging of the battery 22 with a second power source derived from grid power. The charging information includes not only the latest information relating to the charging of the battery 22 of the electric vehicle 2, but also the history of past charging. In this embodiment, as will be described later, the battery 22 of the electric vehicle 2 may be charged with electricity generated by the solar power generation system 34, or with electricity supplied from the power grid 4. In other words, in this embodiment, the first power source derived from renewable energy is the electricity generated by the solar power generation system 34.

[0024] The first processing unit 112 performs processing to realize various functions provided by the first server 11. The first processing unit 112 is implemented by, for example, a microcomputer, but may also be implemented by a processor or dedicated circuit. The functions of the first processing unit 112 are realized by the execution of a computer program (software) stored in the first storage unit 113 by the hardware, such as a microcomputer or processor, that constitutes the first processing unit 112. The first processing unit 112 stores charge information obtained from the energy management system 35 via the first communication unit 111 in the first storage unit 113.

[0025] The first storage unit 113 is a memory device that stores information necessary for processing performed by the first processing unit 112. The information stored in the first storage unit 113 includes the computer program executed by the first processing unit 112. The first storage unit 113 is implemented, for example, by a semiconductor memory. The first storage unit 113 stores charging information acquired from the energy management system 35.

[0026] The second server 12 is a server that manages the electric vehicle 2 by communicating with it via the network N1. In other words, the second server 12 is a management system for managing the electric vehicle 2. In the example shown in Figure 1, the second server 12 communicates with one electric vehicle 2, but if there are multiple electric vehicles 2, it communicates with each of them. In this case, the second server 12 will manage multiple electric vehicles 2. The following explanation will focus on the single electric vehicle 2 managed by the second server 12.

[0027] The second server 12 comprises a second communication unit 121, a second processing unit 122, and a second storage unit 123.

[0028] The second communication unit 121 is a communication module (communication circuit) that communicates with an external system via the network N1. In this embodiment, the second communication unit 121 communicates with the first communication unit 111 of the first server 11, which is an external system, via the network N1. The second communication unit 121 also communicates with the electric vehicle 2, which is an external system, via the network N1. The second communication unit 121 acquires charging information from the energy management system 35 via the first server 11. As a result, the second communication unit 121 acquires charging information periodically, that is, at predetermined intervals. The second communication unit 121 corresponds to the acquisition unit 101 in the emissions calculation system 100.

[0029] Furthermore, the second communication unit 121 periodically acquires the amount of electricity consumed by the electric vehicle 2 as an external system by communicating with the electric vehicle 2 via the network N1. However, if the second calculation unit 103, which will be described later, calculates carbon dioxide emissions using only the first method, the second communication unit 121 does not need to acquire the amount of electricity consumed by the electric vehicle 2 as it runs.

[0030] Furthermore, the second communication unit 121 transmits the carbon dioxide emissions calculated by the second calculation unit 103 (described later) to an external system via the network N1. The external system here may include, for example, the electric vehicle 2, a server operated by the company that manufactures the electric vehicle 2, or an information terminal owned by a user of the electric vehicle 2. The information terminal may include, for example, a smartphone, a tablet terminal, or a personal computer. The second communication unit 121 corresponds to the output unit 104 in the emissions calculation system 100. The second communication unit 121 may transmit the carbon dioxide emissions to the external system periodically, or it may transmit the carbon dioxide emissions to the external system in response to a request from the external system.

[0031] The second processing unit 122 performs processing to realize various functions provided by the second server 12. The second processing unit 122 is implemented by, for example, a microcomputer, but may also be implemented by a processor or dedicated circuit. The functions of the second processing unit 122 are realized by the execution of a computer program (software) stored in the second storage unit 123 by the hardware, such as a microcomputer or processor, that constitutes the second processing unit 122. The second processing unit 122 stores the charging information obtained from the first server 11 via the second communication unit 121 in the second storage unit 123.

[0032] Furthermore, the second processing unit 122 includes a first calculation unit 102 and a second calculation unit 103 in the emissions calculation system 100. In this embodiment, the functions of the first calculation unit 102 and the functions of the second calculation unit 103 are realized by the execution of a predetermined program by the hardware such as a microcomputer or processor that constitutes the second processing unit 122.

[0033] The first calculation unit 102 calculates the ratio (here, as a percentage) of the amount of energy charged by the first power to the amount of energy charged by the battery 22, based on the charging information acquired by the acquisition unit 101 (second communication unit 121). A specific example of how the first calculation unit 102 calculates the ratio will be explained below using Figures 2 and 3. Figure 2 shows an example of charging information. Figure 3 shows an example of the charging history of the battery 22 of the electric vehicle 2.

[0034] In Figure 2, "Date and Time" indicates the time period during which the battery 22 of the electric vehicle 2 was charged, "Purchased Electricity" indicates the amount of electricity supplied from the power grid 4 (in kWh), and "Solar Power Generation" indicates the amount of electricity generated by the solar power generation system 34 (in kWh). Also in Figure 2, "Vehicle ID" indicates the identifier of the electric vehicle 2, "EV Charge Amount" indicates the amount of electricity charged into the battery 22 of the electric vehicle 2 (in kWh), and "Percentage" indicates the percentage calculated by the first calculation unit 102 (in %).

[0035] Figure 3 visually represents the amount of energy charged by the first power source and the amount of energy charged by the second power source in the battery 22 of the electric vehicle 2. In Figure 3, rectangles with solid hatching represent the amount of energy charged by the first power source, and rectangles with dot hatching represent the amount of energy charged by the second power source. Furthermore, Figures 3(a), 3(b), 3(c), and 3(d) represent the state of the battery 22 at 10:00-10:30, 10:30-11:00, 11:30-12:00, and 12:30-13:00, respectively.

[0036] Here, we will explain that the sum of "purchased electricity" and "solar power generation" during any given time period corresponds to "EV charging amount." In other words, we will explain that during any given time period, all the electricity supplied from the power grid 4 (second power) and the electricity generated by the solar power generation system 34 (first power) was used to charge the battery 22 of the electric vehicle 2.

[0037] For example, during the 10:00-10:30 time period, the "EV charging amount" is 3kWh, while the "solar power generation amount" is 1kWh. In this case, the first calculation unit 102 calculates the percentage for 10:00-10:30 as 100 × 1 / 3 ≈ 33%. Also, for example, during the 10:00-13:00 time period, the "EV charging amount" is 3+3+3+3=12kWh, while the "solar power generation amount" is 1+3+3+2=9kWh. In this case, the first calculation unit 102 calculates the percentage for 10:00-13:00 as 100 × 9 / 12 = 75%.

[0038] The second calculation unit 103 calculates the carbon dioxide emissions from the electric vehicle 2 based on the ratio calculated by the first calculation unit 102, the first emission factor which is the carbon dioxide emission factor for renewable energy, and the second emission factor which is the carbon dioxide emission factor for grid electricity.

[0039] The first and second emission factors are both emission factors disclosed by the government, etc., via a website, etc., and are pre-stored in the second memory unit 123. Here, we will explain assuming that the first emission factor is 0 [t-CO2 / kWh]. Of course, the first emission factor may be a value other than 0 [t-CO2 / kWh]. Also, here we will explain assuming that the second emission factor is 0.0004 [t-CO2 / kWh]. Of course, the second emission factor may be a value other than 0.0004 [t-CO2 / kWh].

[0040] The first emission factor may be, for example, an emission factor disclosed by a business operator providing a power source system that generates the first electricity (in this case, a solar power generation system 34) via its website or the like. The second emission factor may be, for example, an emission factor disclosed by an electric utility operating the power grid 4 via its website or the like.

[0041] Here, the second calculation unit 103 may use the following two methods to calculate the carbon dioxide emissions of the electric vehicle 2. The second calculation unit 103 may use only one of the following two methods to calculate the carbon dioxide emissions, or it may use each of the two methods to calculate the carbon dioxide emissions.

[0042] In the first method, when the acquisition unit 101 acquires charging information, the second calculation unit 103 assumes that the amount of electricity charged in the battery 22 of the electric vehicle 2 will eventually be consumed entirely by the electric vehicle 2, and calculates the amount of carbon dioxide emissions from the electric vehicle 2. Here, the amount of electricity charged in the battery 22 of the electric vehicle 2 is, for example, the sum of the amount of electricity charged in the battery 22 during the period from when the electric vehicle 2 is connected to the charging device 31 via a power cable and charging begins, to when the power cable is disconnected from the electric vehicle 2 and charging ends.

[0043] Specifically, in the first method, the second calculation unit 103 calculates the carbon dioxide emissions according to the following formula (1). In formula (1), "A1" represents the carbon dioxide emissions, "P1" represents the amount of charge stored in the battery 22 of the electric vehicle 2, "α" represents the ratio of the amount of charge stored in the first power to the amount of charge stored in the battery 22, "C1" represents the first emission coefficient, and "C2" represents the second emission coefficient.

[0044] A1=P1×α×C1+P1×(1-α)×C2...(1)

[0045] For example, suppose the acquisition unit 101 acquires charging information for the time period 10:00-13:00 as shown in Figure 2. In this case, the second calculation unit 103 calculates the carbon dioxide emissions from the electric vehicle 2 as 12 × 75[%] × 0 + 12 × 25[%] × 0.0004 = 0.0012[t], according to the above formula (1), since the amount of charging power charged to the battery 22 of the electric vehicle 2 is 12kWh and the percentage calculated by the first calculation unit 102 is 75%.

[0046] In the second method, the second calculation unit 103 calculates the amount of carbon dioxide emissions based on the amount of electricity consumed by the electric vehicle 2 while it is running. In this case, the second calculation unit 103 calculates the amount of carbon dioxide emissions from the electric vehicle 2 based on the ratio calculated by the first calculation unit 102, the first emission factor, the second emission factor, and the amount of electricity consumed by the electric vehicle 2 while it is running.

[0047] Specifically, in the second method, the second calculation unit 103 calculates the carbon dioxide emissions according to the following formula (2). In formula (2), "A2" represents the carbon dioxide emissions, and "P2" represents the amount of electricity consumed when the electric vehicle is running. Note that "α", "C1", and "C2" are the same as in formula (1).

[0048] A2=P2×α×C1+P2×(1-α)×C2...(2)

[0049] The following describes specific examples of the calculation of carbon dioxide emissions by the second calculation unit 103 using Figures 4 and 5. Figure 4 is a diagram showing an example of emission information. The emission information is information regarding the carbon dioxide emissions of the electric vehicle 2. Figure 5 is a diagram showing an example of the breakdown of power consumption in the battery 22 of the electric vehicle 2.

[0050] In Figure 4, "Date and Time" indicates the time period during which the electric vehicle 2 was traveling, "Distance Traveled" indicates the distance traveled by the electric vehicle 2 (in "km"), "Energy Consumption" indicates the amount of electricity consumed by the electric vehicle 2 while it was traveling (in "kWh"), and "Percentage" indicates the percentage calculated by the first calculation unit 102 (in "%"). Also in Figure 4, "CO2 Emissions" indicates the amount of carbon dioxide emissions during the time period during which the electric vehicle 2 was traveling, calculated by the second calculation unit 103 (in "t-CO2 / kWh"). example In this case, the date and time are different from the date on which the charging information shown in Figure 2 was acquired. Also, in the example shown in Figure 4, the percentage calculated by the first calculation unit 102 is the percentage calculated by the acquisition unit 101 based on the charging information for the time period of 10:00-13:00 shown in Figure 2. Note that the emissions information does not necessarily have to include the distance traveled by the electric vehicle 2.

[0051] Figure 5 visually represents the amount of energy charged to the battery 22 of the electric vehicle 2 at point P and the amount of energy charged to the battery 22 of the electric vehicle 2 at point Q. In Figure 5, as in Figure 3, rectangles with solid hatching represent the amount of energy charged by the first power, and rectangles with dot hatching represent the amount of energy charged by the second power. In the example shown in Figure 5, the amount of energy charged to the battery 22 is consumed as the electric vehicle 2 travels from point P to point Q. The amount of energy consumed is considered to be the amount of energy charged by the first power and the amount of energy charged by the second power. The ratio of these amounts of energy corresponds to the ratio mentioned above. In other words, in this case, the amount of energy consumed by the first power is 75%, and the amount of energy consumed by the second power is 25%.

[0052] For example, during the 9:00-10:00 time period, the second calculation unit 103 calculates that the amount of power consumed is 2 kWh and the percentage calculated by the first calculation unit 102 is 75%, so according to the formula (2) above, the carbon dioxide emissions from the electric vehicle 2 during that time period are 2 × 75 [%] × 0 + 2 × 25 [%] × 0.0004 = 0.0002 [t].

[0053] The second storage unit 123 is a memory device that stores information necessary for processing performed by the second processing unit 122. The information stored in the second storage unit 123 includes the computer program executed by the second processing unit 122. The second storage unit 123 is implemented, for example, by semiconductor memory. The second storage unit 123 stores charging information acquired from the first server 11, the percentage calculated by the first calculation unit 102, and the amount of carbon dioxide emissions calculated by the second calculation unit 103.

[0054] The electric vehicle 2 is a vehicle that runs using electrical energy stored in a battery 22 as all or part of its power source. The electric vehicle 2 may include, for example, an electric vehicle or a plug-in hybrid vehicle. The electric vehicle 2 comprises an on-board charger 21, a battery 22, a drive unit 23, an ECU (Electronic Control Unit) 24, and a communication unit 25.

[0055] The onboard charger 21 converts the AC power supplied from the charging device 31 via a power cable into DC power suitable for charging and discharging the battery 22, and supplies it to the battery 22.

[0056] The storage battery 22 is, for example, a lithium-ion battery, and stores electrical energy used as power for the electric vehicle 2 by receiving power supplied from the charging device 31 via the onboard charger 21.

[0057] The drive unit 23 includes, for example, a motor, and has a mechanism that drives the electric vehicle 2 to move by using the electrical energy stored in the storage battery 22 as power to rotate the multiple wheels of the electric vehicle 2.

[0058] The ECU24 performs processing to realize various functions by controlling various electronic devices equipped in the electric vehicle 2. The ECU24 is implemented by, for example, a microcomputer, but may also be implemented by a processor or dedicated circuit. The functions of the ECU24 are realized by the execution of computer programs (software) stored in memory by the hardware such as the microcomputer or processor that constitutes the ECU24.

[0059] The communication unit 25 is a communication module (communication circuit) that communicates with an external system via the network N1. In this embodiment, the communication unit 25 communicates with the second server 12, which is an external system, via the network N1.

[0060] Facility 3 is, for example, a residential facility such as a detached house or an apartment building. In this embodiment, Facility 3 will be described as a detached house. Facility 3 includes a charging device 31, a distribution board 32, a power conditioner 33, a solar power generation system 34, an energy management system 35, an electricity meter 36, and one or more loads 37.

[0061] The charging device 31 is configured to be connectable to the electric vehicle 2 via a power cable. When the charging device 31 is connected to the electric vehicle 2 via the power cable, it exchanges power with the electric vehicle 2 according to the control of the energy management system 35. Specifically, the charging device 31 charges the battery 22 of the electric vehicle 2 by supplying power to the electric vehicle 2 via the power cable. The charging device 31 also supplies power to the distribution board 32 by receiving power discharged from the battery 22 of the electric vehicle 2 via the power cable. In other words, the charging device 31 supports V2H (Vehicle to Home) functionality. However, the charging device 31 does not necessarily have to support V2H functionality; it is sufficient that it has at least the function of charging the battery 22 of the electric vehicle 2.

[0062] The charging device 31 includes a DC-DC conversion circuit and an AC-DC conversion circuit. The charging device 31 performs AC / DC conversion between a voltage suitable for use in facility 3 and a voltage suitable for charging and discharging the battery 22 of the electric vehicle 2, for example, using the AC-DC conversion circuit. For example, the voltage suitable for use in facility 3 is an AC voltage of 100V. Also, for example, the voltage suitable for charging and discharging the battery 22 of the electric vehicle 2 is a DC voltage of 300V to 400V.

[0063] The distribution board 32 is connected to one or more loads 37, a charging device 31, a power conditioner 33, and the power grid 4. The distribution board 32 includes one or more branch circuits, one or more relays, and one or more circuit breakers, etc. The distribution board 32 branches the grid power supplied from the power grid 4 and supplies it to one or more loads 37, etc. In addition, when charging the battery 22 of the electric vehicle 2, the distribution board 32 supplies power to the charging device 31. Furthermore, when power discharged from the battery 22 of the electric vehicle 2 is supplied via the charging device 31, the distribution board 32 branches and supplies the power discharged from the battery 22 to one or more loads 37, etc. Moreover, when power generated by the solar power generation system 34 is supplied via the power conditioner 33, the distribution board 32 can branch and supply that power to one or more loads 37 or the charging device 31. Furthermore, the distribution board 32 may be capable of supplying electricity generated by the solar power generation system 34 to the power grid 4.

[0064] The power conditioner 33 is connected between the solar power generation system 34 and the distribution board 32. The power conditioner 33 converts the DC power generated by the solar power generation system 34 into AC power and supplies the converted AC power to the distribution board 32.

[0065] The solar power generation system 34 includes one or more solar cell modules installed, for example, on the roof of facility 3. The solar power generation system 34 supplies the electricity generated by one or more solar cell modules due to sunlight irradiation to the distribution board 32 via a power conditioner 33.

[0066] The energy management system 35 is a so-called HEMS (Home Energy Management System) device that manages the energy (electricity, gas, etc.) consumed by multiple devices such as one or more loads 37 in the facility 3, and controls the multiple devices. In this embodiment, the energy management system 35 acquires the amount of electricity consumed by one or more loads 37 based on the current measured by a first current sensor 51 installed in each of the one or more branch circuits between the distribution board 32 and the one or more loads 37. The energy management system 35 also acquires the amount of electricity supplied from the charging device 31 to the battery 22 of the electric vehicle 2 (corresponding to "EV charge amount" in Figure 2) based on the current measured by a second current sensor 52 installed in the branch circuit between the distribution board 32 and the charging device 31. The energy management system 35 also acquires the amount of electricity generated by the solar power generation system 34 (corresponding to "solar power generation amount" in Figure 2) based on the current measured by a third current sensor 53 installed between the distribution board 32 and the power conditioner 33. Furthermore, the energy management system 35 acquires the amount of electricity supplied from the power grid 4 to the distribution board 32 (corresponding to "purchased electricity" in Figure 2) based on the amount of electricity measured by, for example, a smart meter 36.

[0067] In this embodiment, the first current sensor 51, the second current sensor 52, and the third current sensor 53 are all clamp-type current transformers.

[0068] Furthermore, the energy management system 35 has a communication module that performs short-range wireless communication with relay devices such as wireless routers in accordance with communication standards such as Wi-Fi (registered trademark). The energy management system 35 then communicates with the first server 11 via the relay devices and network N1.

[0069] One or more loads 37 include, for example, household appliances installed in facility 3 such as air conditioners. Here, one or more loads 37 are devices that operate by electricity.

[0070] [3. Operation] The operation of the emissions calculation system 100 according to the embodiment will be described below with reference to Figure 6. Figure 6 is a sequence diagram showing an example of the operation of the emissions calculation system 100 according to the embodiment. As already mentioned, in this embodiment, the emissions calculation system 100 is implemented by the second server 12. In the example shown in Figure 6, the second calculation unit 103 of the second server 12 will be described as calculating the carbon dioxide emissions of the electric vehicle 2 using the second method described above.

[0071] First, the energy management system 35 periodically transmits charging information to the first server 11 via the network N1 (S1). Upon receiving the charging information, the first server 11 transmits it to the second server 12 via the network N1 (S2). As a result, the second communication unit 121 (acquisition unit 101) of the second server 12 periodically acquires the charging information, that is, at predetermined intervals (S3).

[0072] Furthermore, the electric vehicle 2 periodically transmits the amount of power consumed by the battery 22 to the second server 12 via the network N1 (S4). As a result, the second communication unit 121 (acquisition unit 101) of the second server 12 periodically acquires the amount of power consumed, that is, at predetermined intervals (S5).

[0073] Next, the first calculation unit 102 of the second server 12 calculates the ratio of the amount of power charged at the first power to the amount of power charged at the battery 22 of the electric vehicle 2 based on the acquired charging information (S6). Then, the second calculation unit 103 of the second server 12 calculates the amount of carbon dioxide emitted by the electric vehicle 2 based on the ratio calculated by the first calculation unit 102, the first emission coefficient, the second emission coefficient, and the amount of power consumed acquired by the second communication unit 121 (acquisition unit 101) (S7). The calculated amount of carbon dioxide emitted is stored in the second storage unit 123 of the second server 12.

[0074] Subsequently, the second communication unit 121 (output unit 104) of the second server 12 periodically transmits (outputs) the amount of carbon dioxide emissions calculated by the second calculation unit 103 to an external system (for example, a server operated by the electric vehicle 2, the company that manufactures the electric vehicle 2, or an information terminal owned by a user of the electric vehicle 2, etc.) in response to a request from the external system (S8).

[0075] [4. Advantages] The advantages of the emission calculation method and emission calculation system 100 according to the embodiment will be described below. As already mentioned, the battery 22 of the electric vehicle 2 is not always charged with electricity derived from renewable energy, but may also be charged with electricity derived from the grid. Therefore, if it is not possible to know what kind of electricity was used to charge the battery 22 of the electric vehicle 2, there is a problem in that it is not possible to accurately determine the carbon dioxide emissions during operation of the electric vehicle 2.

[0076] Therefore, in the emission calculation method and emission calculation system 100 according to the embodiment, charging information is acquired regarding the charging of the battery 22 of the electric vehicle 2 with a first power source derived from renewable energy, and charging of the battery 22 with a second power source derived from grid power. Then, in the emission calculation method and emission calculation system 100 according to the embodiment, the ratio of the amount of electricity charged with the first power source to the amount of electricity charged with the battery 22 is calculated based on the charging information. Furthermore, in the emission calculation method and emission calculation system 100 according to the embodiment, the amount of carbon dioxide emissions from the electric vehicle 2 is calculated based on the calculated ratio, a first emission factor which is the carbon dioxide emission factor for renewable energy, and a second emission factor which is the carbon dioxide emission factor for grid power.

[0077] Therefore, the emission calculation method and emission calculation system 100 according to this embodiment have the advantage of being able to accurately determine the amount of carbon dioxide emitted when the electric vehicle 2 is running, since the amount of carbon dioxide emitted is calculated based on the source of the electricity used to charge the battery 22 of the electric vehicle 2.

[0078] In particular, the second method of the second calculation unit 103 has the advantage of being able to more accurately determine the amount of carbon dioxide emissions during operation of the electric vehicle 2, as it further references the amount of electricity consumed during the actual operation of the electric vehicle 2.

[0079] Furthermore, because the carbon dioxide emissions from electric vehicle 2 during operation can be accurately determined, there is an advantage in that it is easier to create incentives to promote the widespread adoption of electric vehicle 2 and investment in the introduction of renewable energy. In addition, because the carbon dioxide emissions from electric vehicle 2 during operation can be accurately determined, there is an advantage in that corporate efforts to reduce carbon dioxide emissions are more easily reflected in the degree of reduction in carbon dioxide emissions.

[0080] [5. Variant] Although embodiments have been described above, the present invention is not limited to the embodiments described above.

[0081] For example, in the above embodiment, the second communication unit 121 (acquisition unit 101) of the second server 12 acquires charging information from the energy management system 35 via the first server 11, but this is not limited to this. For example, the second communication unit 121 of the second server 12 may acquire charging information directly from the energy management system 35 via the network N1 without going through the first server 11.

[0082] Furthermore, in the above embodiment, the carbon dioxide emissions are calculated by the second server 12, which is the management system 200 for managing the electric vehicle 2, but this is not limited to this. For example, the electric vehicle 2 may calculate the carbon dioxide emissions. In other words, the emissions calculation system 100 may be implemented by the second server 12, which is the management system 200, or by the electric vehicle 2. Also, the emissions calculation system 100 may be partially implemented by the second server 12 and the remainder implemented by the electric vehicle 2. In other words, the emissions calculation system 100 may be configured to be distributed across the electric vehicle 2 and the management system 200 (second server 12).

[0083] Furthermore, in the above embodiment, the acquisition unit 101 (second communication unit 121) periodically acquires charging information, but is not limited to this. For example, the acquisition unit 101 may periodically acquire charging information in response to requests from users of the emissions calculation system 100. In this case, the output unit 104 will periodically output carbon dioxide emissions.

[0084] Furthermore, in the above embodiment, the first power derived from renewable energy is power generated by the solar power generation system 34, but is not limited to this. For example, the first power may be power derived from other renewable energy sources such as wind, geothermal, hydroelectric, or biomass. In this case, when the first power is power derived from a renewable energy source other than solar power, the first emission factor can be appropriately changed according to the type of renewable energy source. In other words, the first emission factor may be updated according to the type of first power.

[0085] Furthermore, even if the type of electricity remains the same, the first emission factor may be changed if there is a change in the emission factor disclosed by the operator of the power source. In this case, since the latest first emission factor can be used to calculate carbon dioxide emissions, an improvement in the accuracy of calculating carbon dioxide emissions can be expected.

[0086] Furthermore, similar to the first emission factor, the second emission factor may be updated according to the type of second power source. That is, the power supplied from power grid 4, which corresponds to the source of the second power source, may consist solely of power derived from fossil energy sources such as oil, coal, or natural gas, or it may include some power derived from renewable energy sources. For this reason, the second emission factor may change depending on the composition of the power supplied from power grid 4. For this reason, the second emission factor may be updated according to the type of second power source, or in other words, according to the electric utility operating power grid 4.

[0087] Furthermore, the second emission factor may be changed even if the electricity company operating power grid 4 remains the same, if there is a change in the emission factor disclosed by that electricity company. In this case, since the latest second emission factor can be used to calculate carbon dioxide emissions, an improvement in the accuracy of calculating carbon dioxide emissions can be expected.

[0088] Furthermore, the emission calculation method and emission calculation system 100 according to the above embodiment are applicable not only to carbon dioxide but also to greenhouse gases other than carbon dioxide. Specifically, in the emission calculation method, charging information regarding the charging of the battery 22 of the electric vehicle 2 with a first power source derived from renewable energy and the charging of the battery 22 with a second power source derived from grid power is obtained from at least one of the electric vehicle 2 and the management system 200 (second server 12) that manages the electric vehicle 2. In addition, the emission calculation method calculates the ratio of the amount of electricity charged with the first power source to the amount of electricity charged in the battery 22 based on the charging information from at least one of the electric vehicle 2 and the management system 200. In addition, the emission calculation method calculates the amount of greenhouse gas emissions from the electric vehicle 2 based on the above ratio, a first emission factor which is the greenhouse gas emission factor for renewable energy, and a second emission factor which is the greenhouse gas emission factor for grid power, from at least one of the electric vehicle 2 and the management system 200. The emission calculation method also outputs the amount of greenhouse gas emissions.

[0089] Furthermore, in the emissions calculation method, charging information regarding the charging of the battery 22 of the electric vehicle 2 with a first power source derived from renewable energy, and charging of the battery 22 with a second power source derived from grid power, as well as the amount of electricity consumed by the electric vehicle 2 during its operation, is obtained from at least one of the electric vehicle 2 and the management system 200 (second server 12) that manages the electric vehicle 2. Furthermore, in the emissions calculation method, the ratio of the amount of electricity charged with the first power source to the amount of electricity charged in the battery 22 is calculated from at least one of the electric vehicle 2 and the management system 200 based on the charging information. Furthermore, in the emissions calculation method, the greenhouse gas emissions from the electric vehicle 2 are calculated from at least one of the electric vehicle 2 and the management system 200 based on the above ratio, a first emission factor which is the greenhouse gas emission factor for renewable energy, a second emission factor which is the greenhouse gas emission factor for grid power, and the amount of electricity consumed by the electric vehicle 2 during its operation. Furthermore, the emissions calculation method outputs the amount of greenhouse gas emissions.

[0090] Furthermore, the emissions calculation system may be implemented by multiple devices (e.g., multiple servers) or by a single device (e.g., a single server). If the emissions calculation system is implemented by multiple devices, the components of the emissions calculation system (in particular, the functional components) may be distributed among the multiple devices in any way.

[0091] Furthermore, the communication method between devices in the above embodiment is not particularly limited. In addition, relay devices (such as broadband routers) not shown may be involved in the communication between devices.

[0092] Furthermore, in the above embodiment, the processing performed by a specific processing unit may be performed by another processing unit. Also, the order of multiple processing units may be changed, or multiple processing units may be executed in parallel.

[0093] Furthermore, in the above embodiment, each component may be realized by executing a software program suitable for each component. Each component may also be realized by a program execution unit such as a CPU or processor reading and executing a software program recorded on a recording medium such as a hard disk or semiconductor memory.

[0094] Furthermore, each component may be implemented by hardware. For example, each component may be a circuit (or integrated circuit). These circuits may form a single circuit as a whole, or they may be separate circuits. Also, each of these circuits may be a general-purpose circuit or a dedicated circuit.

[0095] Furthermore, general or specific embodiments of the present invention may be implemented as a system, apparatus, method, integrated circuit, computer program, or recording medium such as a computer-readable CD-ROM. Alternatively, they may be implemented as any combination of a system, apparatus, method, integrated circuit, computer program, and recording medium.

[0096] For example, the present invention may be implemented as an information processing method executed by the computer of the emissions calculation system of the above embodiment. The present invention may also be implemented as a program (computer program product) that causes a computer to execute these information processing methods. Furthermore, the present invention may be implemented as a computer-readable non-temporary recording medium on which such a program is recorded.

[0097] Furthermore, the present invention also includes forms obtained by applying various modifications to each embodiment that a person skilled in the art could conceive, or forms realized by arbitrarily combining the components and functions of each embodiment without departing from the spirit of the present invention.

[0098] (summary) As described above, in the emission calculation method according to the first embodiment, charging information regarding the charging of the battery 22 of the electric vehicle 2 with first power derived from renewable energy and charging of the battery 22 with second power derived from grid power is obtained from at least one of the electric vehicle 2 and the management system 200 (second server 12) that manages the electric vehicle 2. Furthermore, in the emission calculation method, the ratio of the amount of electricity charged with first power to the amount of electricity charged in the battery 22 is calculated from at least one of the electric vehicle 2 and the management system 200 based on the charging information. Furthermore, in the emission calculation method, the amount of carbon dioxide emissions from the electric vehicle 2 is calculated from at least one of the electric vehicle 2 and the management system 200 based on the above ratio, a first emission factor which is the carbon dioxide emission factor for renewable energy, and a second emission factor which is the carbon dioxide emission factor for grid power. Furthermore, the emission calculation method outputs the amount of carbon dioxide emissions.

[0099] This method of calculating emissions has the advantage of accurately determining carbon dioxide emissions during operation of the electric vehicle 2, because it calculates carbon dioxide emissions based on the source of the electricity used to charge the battery 22 of the electric vehicle 2.

[0100] Furthermore, in the emission calculation method according to the second embodiment, charging information regarding the charging of the battery 22 of the electric vehicle 2 with first power derived from renewable energy and charging of the battery 22 with second power derived from grid power, as well as the amount of electricity consumed by the electric vehicle 2 during operation, are obtained from at least one of the electric vehicle 2 and the management system 200 (second server 12) that manages the electric vehicle 2. In addition, in the emission calculation method, the ratio of the amount of electricity charged with first power to the amount of electricity charged in the battery 22 is calculated from at least one of the electric vehicle 2 and the management system 200 based on the charging information. Furthermore, in the emission calculation method, the amount of carbon dioxide emissions from the electric vehicle 2 is calculated from at least one of the electric vehicle 2 and the management system 200 based on the above ratio, the first emission factor which is the carbon dioxide emission factor for renewable energy, the second emission factor which is the carbon dioxide emission factor for grid power, and the amount of electricity consumed by the electric vehicle 2 during operation. In addition, the emission calculation method outputs the amount of carbon dioxide emissions.

[0101] This method of calculating emissions has the advantage of accurately determining carbon dioxide emissions during operation of the electric vehicle 2, because it calculates carbon dioxide emissions based on the source of the electricity used to charge the battery 22 of the electric vehicle 2.

[0102] Furthermore, in the emission calculation method according to the third embodiment, charging information is acquired at predetermined intervals and carbon dioxide emissions are output at predetermined intervals, as in the first or second embodiment.

[0103] This method of calculating emissions has the advantage of being convenient because it allows us to understand the amount of carbon dioxide emitted when the electric vehicle 2 is running at predetermined intervals.

[0104] Furthermore, in the emission calculation method relating to the fourth embodiment, in any one of the first to third embodiments, the first power is the power generated by the solar power generation system 34.

[0105] This method of calculating emissions has the advantage of being able to calculate carbon dioxide emissions based on the fact that the battery 22 of the electric vehicle 2 is charged with electricity generated by solar power.

[0106] Furthermore, in the emission calculation method relating to the fifth embodiment, in any one of the first to fourth embodiments, the first emission factor is updated according to the type of first electricity.

[0107] This method of calculating emissions has the advantage of being able to further improve the accuracy of calculating carbon dioxide emissions by using a first emission factor corresponding to the first type of electricity.

[0108] Furthermore, in the emission calculation method relating to the sixth embodiment, in any one of the first to fifth embodiments, the second emission factor is updated according to the type of second electricity.

[0109] This method of calculating emissions has the advantage of being able to further improve the accuracy of calculating carbon dioxide emissions by using a second emission factor corresponding to the type of second power source.

[0110] Furthermore, the program relating to the seventh embodiment causes one or more processors to execute the emissions calculation method relating to any one of the first to sixth embodiments.

[0111] This type of program calculates carbon dioxide emissions based on the source of the electricity used to charge the battery 22 of the electric vehicle 2, which has the advantage of making it easier to accurately determine the carbon dioxide emissions when the electric vehicle 2 is running.

[0112] Furthermore, the emissions calculation system 100 according to the eighth embodiment is an emissions calculation system 100 provided in either the electric vehicle 2 or the management system 200 for managing the electric vehicle 2. The emissions calculation system 100 includes an acquisition unit 101 (second communication unit 121), a first calculation unit 102 (second processing unit 122), a second calculation unit 103 (second processing unit 122), and an output unit 104 (second communication unit 121). The acquisition unit 101 acquires charging information regarding the charging of the battery 22 of the electric vehicle 2 with first power derived from renewable energy, and charging of the battery 22 with second power derived from grid power. Based on the charging information, the first calculation unit 102 calculates the ratio of the amount of power charged with first power to the amount of power charged with battery 22. The second calculation unit 103 calculates the carbon dioxide emissions from the electric vehicle 2 based on the above ratio, the first emission factor which is the carbon dioxide emission factor for renewable energy, and the second emission factor which is the carbon dioxide emission factor for grid power. The output unit 104 outputs the carbon dioxide emissions.

[0113] Such an emissions calculation system 100 has the advantage of being able to accurately determine the amount of carbon dioxide emitted when the electric vehicle 2 is running, because it calculates carbon dioxide emissions based on the source of the electricity used to charge the battery 22 of the electric vehicle 2.

[0114] Furthermore, the emissions calculation system 100 according to the ninth embodiment is an emissions calculation system 100 provided in either the electric vehicle 2 or the management system 200 for managing the electric vehicle 2. The emissions calculation system 100 includes an acquisition unit 101 (second communication unit 121), a first calculation unit 102 (second processing unit 122), a second calculation unit 103 (second processing unit 122), and an output unit 104 (second communication unit 121). The acquisition unit 101 acquires charging information regarding the charging of the battery 22 of the electric vehicle 2 with first power derived from renewable energy and charging of the battery 22 with second power derived from grid power, as well as the amount of electricity consumed by the electric vehicle 2 during operation. The first calculation unit 102 calculates the ratio of the amount of electricity charged with first power to the amount of electricity charged with battery 22 based on the charging information. The second calculation unit 103 calculates the amount of carbon dioxide emitted by the electric vehicle 2 based on the above ratio, the first emission factor which is the carbon dioxide emission factor for renewable energy, the second emission factor which is the carbon dioxide emission factor for grid power, and the amount of electricity consumed by the electric vehicle 2 during operation. The output unit 104 outputs the amount of carbon dioxide emitted.

[0115] Such an emissions calculation system 100 has the advantage of being able to accurately determine the amount of carbon dioxide emitted when the electric vehicle 2 is running, because it calculates carbon dioxide emissions based on the source of the electricity used to charge the battery 22 of the electric vehicle 2. [Explanation of Symbols]

[0116] 100 Emissions Calculation System 101 Acquisition Department 102 First Calculation Unit 103 Second Calculation Unit 104 Output section 2 Electric Vehicles 200 Management Systems 22 Storage batteries 34 Solar power generation system

Claims

1. Charging information regarding the charging of the electric vehicle's battery using a first power source derived from renewable energy, and the charging of the battery using a second power source derived from grid power, is acquired by at least one of the electric vehicle and the management system that manages the electric vehicle. Based on the charging information, the ratio of the amount of power charged by the first power to the amount of power charged by the battery is calculated in at least one of the electric vehicle and the management system. Based on the aforementioned ratio, a first emission factor which is the carbon dioxide emission factor for the renewable energy, a second emission factor which is the carbon dioxide emission factor for the grid power, and the amount of electricity charged to the battery, the carbon dioxide emissions from the electric vehicle are calculated from at least one of the electric vehicle and the management system. Outputting the aforementioned carbon dioxide emissions, Emission calculation method.

2. Charging information regarding the charging of the electric vehicle's battery using a first power source derived from renewable energy, and the charging of the battery using a second power source derived from grid power, as well as the amount of electricity consumed by the electric vehicle during operation, are acquired by at least one of the electric vehicle and the management system that manages the electric vehicle. Based on the charging information, the ratio of the amount of power charged by the first power to the amount of power charged by the battery is calculated in at least one of the electric vehicle and the management system. Based on the aforementioned ratio, a first emission factor which is the carbon dioxide emission factor for the renewable energy, a second emission factor which is the carbon dioxide emission factor for the grid power, and the amount of electricity consumed by the operation of the electric vehicle, the carbon dioxide emissions from the electric vehicle are calculated from at least one of the electric vehicle and the management system. Outputting the aforementioned carbon dioxide emissions, Emission calculation method.

3. The aforementioned charging information is acquired at predetermined intervals, The carbon dioxide emissions are output at predetermined intervals. The method for calculating emissions according to claim 1 or 2.

4. The first power is power generated by a solar power generation system. The method for calculating emissions according to claim 1 or 2.

5. The first emission factor is updated according to the type of first power. The method for calculating emissions according to claim 1 or 2.

6. The second emission factor is updated according to the type of the second power supply. The method for calculating emissions according to claim 1 or 2.

7. One or more processors, The method for calculating emissions according to claim 1 or 2 is performed. program.

8. An emissions calculation system provided in either an electric vehicle or a management system for managing said electric vehicle, An acquisition unit that acquires charging information regarding the charging of the battery of the electric vehicle using a first power source derived from renewable energy, and the charging of the battery using a second power source derived from grid power, A first calculation unit calculates the ratio of the amount of power charged at the first power to the amount of power charged at the battery based on the charging information, A second calculation unit calculates the amount of carbon dioxide emissions from the electric vehicle based on the aforementioned ratio, a first emission factor which is the carbon dioxide emission factor for the renewable energy, a second emission factor which is the carbon dioxide emission factor for the grid power, and the amount of electricity charged to the battery. The system includes an output unit that outputs the carbon dioxide emissions mentioned above, Emissions calculation system.

9. An emissions calculation system provided in either an electric vehicle or a management system for managing said electric vehicle, An acquisition unit that acquires charging information regarding the charging of the electric vehicle's battery with a first power source derived from renewable energy and the charging of the battery with a second power source derived from grid power, as well as the amount of electricity consumed by the electric vehicle during operation. A first calculation unit calculates the ratio of the amount of power charged at the first power to the amount of power charged at the battery based on the charging information, A second calculation unit calculates the amount of carbon dioxide emissions from the electric vehicle based on the aforementioned ratio, a first emission factor which is the carbon dioxide emission factor for the renewable energy, a second emission factor which is the carbon dioxide emission factor for the grid power, and the amount of electricity consumed by the operation of the electric vehicle. The system includes an output unit that outputs the carbon dioxide emissions mentioned above, Emissions calculation system.

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