Display control device

Abstract

To provide technology that makes it possible to display the exact remaining life of a battery.SOLUTION: Provided is a display control device including at least one processor. The processor estimates an SOC that indicates the charge state of a battery mounted to a vehicle, cumulatively adds a current flowing in the battery so as to calculate an integral current value of the current, and shows a 1SOC for display that is calculated on the basis of the SOC as the remaining life of the battery on a display of the vehicle. When the integral current value exceeds a specific threshold within a specific region of the battery's open-circuit voltage to SOC characteristic, the processor corrects the SOC by subtracting a specific correction amount from an SOC that is estimated after the integral current value exceeded the threshold. Then, the processor causes the display to show a 2SOC for display that is calculated on the basis of the SOC after the correction.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a display control device.

Background Art

[0002] Patent Document 1 discloses a device that displays the remaining capacity of a battery on a display. The device detects the charge and discharge current of the battery, estimates the state of charge (SOC), which is the integrated remaining capacity of the battery, based on the integrated value of the charge and discharge current, and when the voltage of the battery becomes equal to or higher than a predetermined value or equal to or lower than a predetermined value, resets the SOC to an upper limit value or a lower limit value, updates a correction amount, and displays the corrected SOC for display and control on the display.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, depending on the type of battery, the voltage fluctuation of the battery detected in a specific region of the SOC-OCV (Open Circuit Voltage) characteristic is small. In such a region, it is difficult to estimate the SOC from the voltage, and it is necessary to estimate the SOC from the integrated value of the current, where errors are easily integrated. Although the above conventional technology shows a method for reducing the current integration error, when continuously used in a specific region, it may not be possible to accurately correct the SOC. Therefore, the remaining amount of the battery displayed on the display may be displayed as larger than the actual remaining amount of the battery. That is, since the corrected SOC for display can be larger than the actual SOC of the battery, the cruising range of the vehicle grasped by the driver and the actual cruising range of the vehicle can deviate significantly. Thus, in the conventional technology, there is room for improvement in appropriately displaying the remaining amount of the battery to the driver regardless of the type of battery.

[0005] The present disclosure provides a technique for preventing the remaining battery level from being overly displayed to the driver.

Means for Solving the Problem

[0006] According to one aspect of the present disclosure, there is provided a display control device including at least one processor, wherein the processor estimates a state of charge (SOC) indicating the charge state of a battery mounted on a vehicle, calculates a current integrated value of the current by cumulatively adding the current flowing through the battery, displays a first SOC for display calculated based on the SOC as the remaining amount of the battery on a display of the vehicle, and when the current integrated value exceeds a specific threshold within a specific region in the characteristics of the open-circuit voltage of the battery with respect to the SOC, corrects the SOC by subtracting a specific correction amount from the SOC estimated after the current integrated value exceeds the threshold, and causes the display to display a second SOC for display calculated based on the corrected SOC.

Advantages of the Invention

[0007] According to the present disclosure, the remaining amount of the battery can be appropriately displayed.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0009] Hereinafter, an aspect of the present disclosure will be described with reference to the drawings. Note that the drawings used in the following description are all schematic, and the dimensional relationships, ratios of each element, etc. shown in the drawings do not necessarily match the actual ones. Further, the present disclosure is not limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the present disclosure.

[0010] FIG. 1 is a configuration diagram of a display control system according to an embodiment of the present disclosure. The display control system 100 may include a vehicle 200 and a server 300. The vehicle 200 and the server 300 are configured to be communicable with each other via a communication network 400. The communication between the vehicle 200 and the communication network 400 may be performed wirelessly. The communication between the server 300 and the communication network 400 may be performed wired or wirelessly. The vehicle 200 may be interpreted as a battery electric vehicle (BEV) having a battery 240 that stores power for traveling and a motor 260 that is a main electric motor for traveling as power sources. Note that the vehicle 200 is not limited to a BEV, and may include a hybrid electric vehicle (HEV) having a traveling battery 240, a plug-in hybrid electric vehicle (PHEV), and the like.

[0011] The server 300 may be interpreted as a computer belonging to a cloud computing system and implementing various functions.

[0012] The vehicle 200 may include an ECU (Electronic Control Unit) 210, a communication device 220, a charging device 230, a battery 240, a PCU (Power Control Unit) 250, a motor 260, a display control device 270, and a display device 280.

[0013] The charging device 230 may be interpreted as a device that charges the battery 240. The charging device 230 may include an AC / DC converter and, by being controlled by the ECU 210, may convert the AC power supplied from a device external to the vehicle 200 into DC power. The converted DC power is supplied to the battery 240. Thereby, the battery 240 is charged.

[0014] The battery 240 may be interpreted as a power storage device including a plurality of cells. Specifically, the battery 240 may be interpreted as a device that stores the power for driving the motor 260 and also stores the power regenerated from the motor 260. Each of the plurality of cells included in the battery 240 may be a secondary battery such as a ternary lithium-ion battery, a nickel-metal hydride battery, or a lithium iron phosphate (LFP) battery.

[0015] The PCU 250, by being controlled by the ECU 210, may be interpreted as a driving device that drives the motor 260. The PCU 250 may convert the DC power discharged from the battery 240 into AC power and supply the AC power to the motor 260 to drive the motor 260. The PCU 250 may convert the AC power regenerated from the motor 260 into DC power and supply the DC power to the battery 240 to charge the battery 240. The current flowing during charging and discharging of the battery 240 is detected by the current sensor 10, and the detected current may be transmitted to the ECU 210 and the display control device 270. The current sensor 10 may be interpreted as a sensor that detects the current flowing through the battery 240. The current sensor 10 may detect at least one of the current discharged from the battery 240 and the current charged into the battery 240, and output a voltage indicating the value of the detected current as current information.

[0016] The motor 260 may be interpreted as the main electric motor for vehicle driving. The motor 260 may rotate by the AC power from the PCU 250 to apply a driving torque to the drive wheels of the vehicle 200 to make the vehicle 200 travel.

[0017] The communication device 220 may be interpreted as a communication interface that exchanges signals with the server 300 via the communication network 400.

[0018] The display device 280 may be interpreted as an instrument panel, a navigation device, etc. provided in the vehicle 200. The instrument panel may be interpreted as an instrument panel where meters are installed. The navigation device may be interpreted as a device having a function of guiding a route from the current position to the destination when the vehicle 200 is running. The display device 280 is not limited to the instrument panel, the navigation device, etc., and may also be interpreted as a head-up display or a terminal device such as a smartphone installed in the vehicle 200.

[0019] The display device 280 may display the SOC estimated by the display control device 270 as the remaining amount of the battery 240. The remaining amount of the battery 240 may be displayed in the form of a graph, numerical values, etc. Details of the configuration of the display control device 270 will be described later.

[0020] Next, a hardware configuration example of the display control device will be described with reference to FIG. 2. FIG. 2 is a hardware configuration diagram of the display control device according to the embodiment of the present disclosure. The display control device 270 may include a processor 1, a memory 2, a communication I / F 3, and an input / output I / F 4. These may be connected to be communicable with each other via a bus 5.

[0021] The processor 1 may be interpreted as a central processing unit. The processor 1 may execute various programs and control each part. The processor 1 may read the display control program from the memory 2 and execute specific processing by expanding the display control program. The functions realized by the display control program will be described later.

[0022] The communication I / F 3 may be interpreted as an interface for the display control device 270 to communicate with other devices. Standards such as CAN (Controller Area Network), Ethernet (registered trademark), and Wi-Fi (registered trademark) may be used for the communication I / F 3.

[0023] The input / output I / F 4 may input the current detected by the current sensor 10 shown in FIG. 1.

[0024] Next, the functions of the display control device will be described with reference to FIGS. 3 and 4. FIG. 3 is a functional block diagram of the display control device. The display control device 270 may include an input unit 201, an SOC estimation unit 202, an integrated value calculation unit 203, and a display control unit 204. The input unit 201, the SOC estimation unit 202, the integrated value calculation unit 203, and the display control unit 204 may be realized by the processor 1 shown in FIG. 2 executing a display control program.

[0025] (Input Unit 201) The input unit 201 may input specific information via the communication I / F 3 and the input / output I / F 4 shown in FIG. 2. Specifically, the input unit 201 may input information indicating the value of the current detected by the current sensor 10 shown in FIG. 1 at a specific period. In addition to the information indicating the value of the current, the input unit 201 may input information indicating the value of the voltage of the battery 240 shown in FIG. 1.

[0026] (SOC Estimation Unit 202) The SOC estimation unit 202 may estimate the state of charge (SOC) indicating the charging state of the battery 240 mounted on the vehicle 200. Specifically, based on at least one of the current and voltage input to the input unit 201, the SOC of the battery 240 may be estimated using a known estimation method.

[0027] (Integrated Value Calculation Unit 203) The integrated value calculation unit 203 may calculate the current integrated value of the current by cumulatively adding the current flowing through the battery 240. Specifically, the integrated value calculation unit 203 may calculate the current integrated value by integrating the absolute value of the current input to the input unit 201 over time. More specifically, the integrated value calculation unit 203 may calculate the current integrated value by integrating the absolute value of the current during charging and discharging of the battery 240 over time. The current input to the input unit 201 may be interpreted as the current detected by the current sensor 10 shown in FIG. 1. Note that the integrated value calculation unit 203 may calculate the current integrated value using only the current during either charging or discharging of the battery 240.

[0028] (Display control unit 204) The display control unit 204 may generate display information for displaying the SOC estimated by the SOC estimation unit 202 as the remaining amount of the battery 240 on the display of the vehicle 200, and transmit the display information to the display device 280 shown in FIG. 1. As a result, the estimated SOC (first SOC for display) may be displayed as the remaining amount of the battery 240 on the display 280a of the display device 280.

[0029] When the current integrated value does not exceed a specific threshold, the display control unit 204 may display the first SOC for display calculated based on the estimated SOC as the remaining amount of the battery 240 on the display 280a. When the current integrated value exceeds a specific threshold, the display control unit 204 may correct the estimated SOC, and display the second SOC for display calculated based on the corrected SOC as the remaining amount of the battery 240 on the display 280a.

[0030] More specifically, when the current integrated value exceeds a specific threshold, the display control unit 204 may correct the SOC by subtracting a specific correction amount from the SOC estimated after the current integrated value exceeds the threshold, and display the second SOC for display calculated based on the corrected SOC as the remaining amount of the battery 240 on the display 280a.

[0031] When the integrated current value exceeds a specific threshold within a specific region in the characteristic of the open-circuit voltage of the battery 240 with respect to the SOC (SOC-OCV characteristic), the display control unit 204 may correct the SOC by subtracting a specific correction amount from the SOC estimated after the integrated current value exceeds the threshold, and cause the display device 280a to display the second SOC for display calculated based on the corrected SOC.

[0032] When subtracting the specific correction amount, the display control unit 204 may subtract the specific correction amount from the estimated SOC from the time when the integrated current value exceeds the threshold until the integrated current value reaches near a specific boundary. The specific boundary may be interpreted as the boundary between the third region described later and another specific region adjacent thereto (for example, the first region or the second region described later). Examples of the SOC before and after correction will be described later.

[0033] The specific region may be interpreted as a region where the rate of change of the open-circuit voltage with respect to the SOC is smaller than a specific value in the SOC-OCV characteristic. Specifically, the specific region may be interpreted as one of the three regions shown in FIG. 4. More specifically, the specific region may be interpreted as the third region A3 shown in FIG. 4. FIG. 4 is a diagram showing an example of the SOC-OCV characteristic. In FIG. 4, the SOC-OCV characteristic of the LFP battery is shown by a thick solid line, and the SOC-OCV characteristics of batteries other than the LFP battery are shown by a normal solid line. The SOC-OCV characteristic of the LFP battery may include a first region A1, a second region A2, and a third region A3.

[0034] The first region A1 is a region where the rate of change of the open-circuit voltage with respect to the SOC is larger than a specific value and includes the case where the SOC is 0%. Specifically, the first region A1 may be interpreted as a region where the SOC is from 0% to, for example, 10%. The first region A1 may be interpreted as a region where the estimation error of the SOC is small even when the SOC is estimated based on the voltage.

[0035] The second region A2 may be interpreted as a region where the rate of change of the open-circuit voltage with respect to the SOC is greater than a specific value and includes the case where the SOC is 100%. Specifically, the second region A2 may be interpreted as a region where the SOC ranges from around 90% to 100%. Similar to the first region A1, the second region A2 may be interpreted as a region where the estimation error of the SOC is small even when the SOC is estimated based on the voltage.

[0036] The third region A3 may be interpreted as a region where the rate of change of the open-circuit voltage with respect to the SOC is smaller than a specific value and is between the first region A1 and the second region A2. Specifically, the third region A3 may be interpreted as a region where the SOC ranges from around 10% to around 90%. The third region A3 may be interpreted as a region where the estimation error of the SOC may be large when the SOC is estimated based on the voltage.

[0037] As described above, in the LFP battery, in the region (the third region A3) excluding the regions near SOC 100% and near 0% in the SOC-OCV characteristics, the open-circuit voltage shows a flat value. For this reason, in a known SOC estimation method based on the current integration value and the voltage value, the current error detected by the current sensor 10 accumulates, and it may be difficult to accurately estimate the SOC in the third region A3 of the LFP battery. Therefore, if the LFP battery is not fully charged and the charge and discharge of the LFP battery are repeatedly executed in the third region A3, the current integration error accumulates, and the estimation accuracy of the SOC may decrease. Accordingly, the estimated SOC may be higher or lower than the actual SOC of the battery 240, and the actual cruising range of the vehicle 200 may deviate significantly from the estimated cruising range.

[0038] As a countermeasure, for example, when the display control unit 204 designates a specific area as the third area A3 and the integrated current value calculated within the third area A3 exceeds a specific threshold value, the display control unit 204 may correct the SOC by subtracting a correction amount from the SOC estimated after the integrated current value exceeds the threshold value. Then, the display control unit 204 may cause the display 280a to display the second SOC for display calculated based on the corrected SOC. Thereby, even when the battery 240 is an LFP battery, it is possible to suppress the SOC estimated in the third area A3 from becoming higher than the actual SOC of the battery 240.

[0039] The threshold value may be set based on the rated battery capacity. The threshold value may also be set using a table including the temperature of the battery 240, the state of deterioration (SOH), and the like. Specifically, table information associating the temperature of the battery 240 with the threshold value, table information associating the state of deterioration (SOH) with the threshold value, and the like may be used.

[0040] After the integrated current value exceeds the threshold value, the display control unit 204 may increase the correction amount as the integrated current value increases. Specifically, after the integrated current value exceeds a specific threshold value, the display control unit 204 may continuously or stepwise increase the correction amount as the integrated current value increases until the SOC reaches the specific boundary described above.

[0041] By increasing the correction amount, the remaining amount of the battery 240 grasped by the driver of the vehicle 200 (that is, the remaining driving distance of the vehicle 200) can be an appropriate value. Specifically, as described above, the SOC-OCV characteristics of the LFP battery are such that in the third region A3, the rate of change of the open-circuit voltage with respect to SOC is very small, the estimation of SOC based on voltage is not performed, and the current integration error continues to accumulate. Therefore, when the correction amount is constant, the decrease in SOC with respect to the amount of power used in the actual driving of the vehicle 200 becomes small, and the remaining amount of the battery 240 displayed may become larger than the actual remaining amount. For example, when the actual remaining amount of the battery 240 is 50%, even if the remaining amount of the battery 240 displayed is 49% and the difference is -1%, when the actual remaining amount of the battery 240 drops to 20%, if the correction amount is constant, the current integration error accumulates, and the remaining amount of the battery 240 displayed becomes 25%, and the difference can become +5%. Therefore, as described above, by increasing the correction amount over time after exceeding the threshold value, the remaining amount of the battery 240 becomes an appropriate value, and before the actual remaining amount of the battery 240 drops to the first region, it is possible to surely notify the driver of the decrease in the remaining amount of the battery. Note that the range in which the correction amount is increased may be set in the region from the time when the current integration value exceeds the threshold value to the time when the current integration value reaches the time corresponding to the vicinity of a specific boundary.

[0042] When the estimated SOC is in the above-described first region or when the estimated SOC is in the above-described second region, the integrated value calculation unit 203 may reset the current integration value. By resetting the current integration value in these regions, it is possible to suppress over-correcting (that is, negatively correcting) the SOC displayed to the driver. Thereby, it is possible to prevent the remaining driving distance of the vehicle 200 displayed in these regions from significantly decreasing. For example, even if the actual SOC in the first region is 15%, it is possible to suppress the SOC corrected by the display control unit 204 from becoming 5%. That is, it is possible to suppress the value of the SOC displayed in these regions from greatly deviating from the actual remaining amount of the battery 240. As a result, it is possible to suppress the driver from feeling mentally uneasy due to an excessive decrease in the remaining driving distance.

[0043] Note that depending on the error characteristics of the current sensor, (the threshold value and correction amount of the current integrated value may become inappropriate), for example, when the SOC displayed before reset is larger than the SOC displayed after reset, the correction amount may be insufficient. Conversely, when the SOC displayed before reset is smaller than the SOC displayed after reset, overcorrection may occur. Therefore, the display control unit 204 may dynamically change the threshold value and correction amount so as to make the deviation of the SOC displayed before and after reset approach 0.

[0044] Next, the operation of the display control device will be described with reference to FIGS. 5 and 6. FIG. 5 is a flowchart for explaining the operation of the display control device. FIG. 6 is a diagram for explaining the operation of the display control device. In FIG. 6, the current flowing through the battery 240 (normal solid line), the first SOC for display (dotted line), the correction amount (broken line), the second SOC for display (thick solid line), the current integrated value (two-dot chain line), the above-described threshold value, etc. are shown. The vertical axis represents these values, and the horizontal axis represents time (time).

[0045] In step 1, the display control device 270 calculates (estimates) the SOC. In step 2, the display control device 270 determines whether the SOC is in the first region A1 or the second region A2. If the SOC is in the first region A1 or the second region A2 (step S2: YES), the process of step 10 is executed. If the SOC is not in the first region A1 or the second region A2, that is, if it is in the third region A3 (step S2: NO), the process of step 3 is executed.

[0046] In step 3, the display control device 270 calculates the current integrated value. Specifically, the display control device 270 may calculate the integrated value (∫abs(current)dt) of the absolute value (abs(current)) of the current flowing through the battery 240. Note that the display control device 270 may calculate the current integrated value using the absolute values of the currents during both charging and discharging of the battery 240. Alternatively, the display control device 270 may calculate the current integrated value using only the current during either charging or discharging. When using only the charging current, it is possible to suppress the actual cruising range from becoming shorter than the cruising range assumed by the user before driving due to the increase in the correction amount as described above while the vehicle 200 is in motion.

[0047] In step 4, the display control device 270 compares the current integrated value with a threshold value. If the current integrated value does not exceed the threshold value (step S4: NO), the process of step 5 is executed. If the current integrated value exceeds the threshold value (step S4: YES), the process of step 7 is executed.

[0048] In step 5, the display control device 270 calculates the SOC for display (display first SOC), that is, the remaining amount of the battery 240, based on the estimated SOC. In step 6, the display control device 270 causes the display 280a to display the SOC for display.

[0049] In step 7, the display control device 270 calculates a correction amount. Specifically, the correction amount (soc_offset) may be calculated by the following (1). In the following (1), th1 may be interpreted as the above-mentioned threshold value and may be interpreted as a correction start threshold value. ∫abs(current)dt may be interpreted as the current integrated value. k1 may be interpreted as a correction coefficient. soc_offset = (∫abs(current)dt - th1) × correction coefficient (k1) ··· (1)

[0050] The correction coefficient (k1) may be set to a positive value in consideration of manufacturing tolerances, detection accuracy, etc. of the current sensor 10, that is, the uncertainty of the current sensor 10. The correction coefficient (k1) may be set to a smaller value for a higher-precision current sensor 10. The display control device 270 may change the correction coefficient (k1) so as to make the deviation of the SOC displayed before and after reset approach zero.

[0051] Note that for the calculation of the correction amount (soc_offset), instead of the current integration value, the driving distance of the vehicle 200, the elapsed time since the fully charged state of the battery 240 is discharged, etc. may be used. In this case, compared with the case of using the current integration value, the SOC correction accuracy may be inferior, but it is considered that the same effect as when the correction amount is calculated using the current integration value can be obtained.

[0052] In step 8, the display control device 270 may correct the SOC by subtracting the correction amount calculated in step S7 from the estimated SOC. Also, as described above, the display control device 270 may increase the correction amount (soc_offset) according to the current integration value.

[0053] In step 9, the display control device 270 may calculate the SOC for display (display second SOC), that is, the remaining amount of the battery 240, based on the estimated SOC. Then, in step 6, the display control device 270 may display the SOC for display on the display 280a. Thereby, it is possible to prevent the display of an SOC or an estimated cruising range having a value higher than the actual remaining amount of the battery 240. Also, for a user who continues to use a specific area of the SOC displayed on the meter (for example, an area from about 20% to 80%), it is possible to prompt the user to periodically fully charge the battery 240.

[0054] In step 10, the display control device 270 resets the current integration value, and in step 11, the display control device 270 updates threshold values, correction coefficients, etc.

[0055] Note that the SOC to which the above correction is applied may be used not only for the meter display of the vehicle 200 and the calculation of the cruising range but also for charge control. Thereby, regular full charging can be promoted. The charge control may include, for example, control to stop charging at the specified upper limit when the user can specify the upper limit of the charge SOC.

[0056] (Operation, Effect) As described above, the display control device 270 of the present disclosure estimates the SOC indicating the charge state of the battery 240 mounted on the vehicle 200, calculates the current integrated value of the current by cumulatively adding the current flowing through the battery 240, displays the SOC as the remaining amount of the battery 240 on the display 280a of the vehicle 200, and when the current integrated value exceeds a specific threshold within a specific region in the characteristic of the open-circuit voltage of the battery 240 with respect to the SOC, corrects the SOC by subtracting a specific correction amount from the SOC estimated after the current integrated value exceeds the threshold, and can display the corrected SOC on the display 280a.

[0057] Thereby, even when the battery 240 is an LFP battery, it is possible to prevent the SOC estimated in a specific region such as the third region A3 from being erroneously estimated higher than the actual SOC of the battery 240. For this reason, the remaining amount of the battery 240 displayed to the driver becomes an appropriate value, and the driver can be prompted to charge before the actual remaining amount of the battery 240 significantly decreases.

[0058] Note that the display control program of the present disclosure may be installed in a server 300 including at least one processor. In this case, the processor of the server 300 may acquire vehicle information from the vehicle 200. The vehicle information may include information indicating the value of the current flowing through the battery 240. The processor of the server 300 may estimate the state of charge (SOC) of the battery 240 by a known SOC estimation method. The processor of the server 300 may, based on the display control program, cumulatively add the current flowing through the battery 240, calculate the integrated current value of the current, generate display information for displaying the estimated SOC as the remaining amount of the battery 240 on the display 280a of the vehicle 200, and transmit the generated display information to the vehicle 200. When the integrated current value exceeds a specific threshold within a specific region in the characteristics of the open-circuit voltage of the battery 240 with respect to the SOC, the processor of the server 300 may correct the SOC by subtracting a specific correction amount from the SOC estimated after the integrated current value exceeds the threshold, generate display information for displaying the corrected SOC on the display 280a, and transmit the generated display information to the vehicle 200.

[0059] (Appendix) Regarding the above embodiments, the following appendix is further disclosed.

[0060] (Appendix 1) A display control device including at least one processor, wherein the processor estimates the state of charge (SOC) indicating the charging state of a battery mounted on a vehicle, calculates the integrated current value of the current by cumulatively adding the current flowing through the battery, displays a first SOC for display calculated based on the SOC as the remaining amount of the battery on the display of the vehicle, and when the integrated current value exceeds a specific threshold within a specific region in the characteristics of the open-circuit voltage of the battery with respect to the SOC, corrects the SOC by subtracting a specific correction amount from the SOC estimated after the integrated current value exceeds the threshold, and causes the display to display a second SOC for display calculated based on the corrected SOC.

[0061] (Appendix 2) The display control device according to Appendix 1, wherein the processor increases the correction amount as the integrated current value increases after the integrated current value exceeds a specific threshold value.

[0062] (Appendix 3) When the characteristic of the open-circuit voltage of the battery with respect to the SOC includes a first region in which the change rate of the open-circuit voltage with respect to the SOC is greater than a specific value and includes the case where the SOC is 0%, a second region in which the change rate is greater than the specific value and includes the case where the SOC is 100%, and a third region in which the change rate is smaller than the specific value and is between the first region and the second region, the processor Regarding the specific region as the third region, when the integrated current value calculated within the third region exceeds the threshold value, the SOC is corrected by subtracting the correction amount from the SOC estimated after the integrated current value exceeds the threshold value, and the second SOC for display is displayed on the display device. The display control device according to Appendix 1.

[0063] (Appendix 4) The display control device according to Appendix 3, wherein the processor resets the integrated current value when the estimated SOC is in the first region or when the estimated SOC is in the second region.

[0064] (Appendix 5) Estimate the state of charge (SOC) of the battery mounted on the vehicle, calculate the integrated current value of the current by cumulatively adding the current flowing through the battery, display the first SOC for display calculated based on the SOC as the remaining amount of the battery on the display device of the vehicle, When the integrated current value exceeds a specific threshold within a specific region in the characteristics of the open-circuit voltage of the battery with respect to the SOC, correct the SOC by subtracting a specific correction amount from the SOC estimated after the integrated current value exceeds the threshold, and cause the display device to display a second SOC for display calculated based on the corrected SOC. A display control program for causing a computer to execute this.

[0065] (Appendix 6) Estimate the SOC indicating the state of charge of the battery mounted on the vehicle, Calculate the integrated current value of the current by cumulatively adding the current flowing through the battery, Display a first SOC for display calculated based on the SOC on the display device of the vehicle as the remaining amount of the battery, When the integrated current value exceeds a specific threshold within a specific region in the characteristics of the open-circuit voltage of the battery with respect to the SOC, correct the SOC by subtracting a specific correction amount from the SOC estimated after the integrated current value exceeds the threshold, and cause the display device to display a second SOC for display calculated based on the corrected SOC. A display control method executed by a processor.

Explanation of Signs

[0066] 1 Processor 2 Memory 3 Communication I / F 4 Input / Output I / F 5 Bus 10 Current Sensor 100 Display Control System 200 Vehicle 201 Input Unit 202 SOC Estimation Unit 203 Integrated Value Calculation Unit 204 Display Control Unit 220 Communication Device 230 Charging Device 240 Battery 250 PCU 260 Motor 270 Display Control Device 280 Display Device 280a display 300 server 400 communication network

Claims

1. A display control device including at least one processor, wherein the processor: estimates a state of charge (SOC) indicating a state of charge of a battery mounted on a vehicle; calculates an integrated current value of the current by cumulatively adding the current flowing through the battery; displays a first SOC for display calculated based on the SOC as a remaining amount of the battery on a display of the vehicle; when the integrated current value exceeds a specific threshold within a specific region in a characteristic of an open-circuit voltage of the battery with respect to the SOC, corrects the SOC by subtracting a specific correction amount from the SOC estimated after the integrated current value exceeds the threshold, and causes the display to display a second SOC for display calculated based on the corrected SOC.

2. The display control device according to claim 1, wherein the processor increases the correction amount as the integrated current value increases after the integrated current value exceeds the specific threshold.

3. When the characteristic of the open-circuit voltage of the battery with respect to the SOC includes a first region in which a rate of change of the open-circuit voltage with respect to the SOC is greater than a specific value and the SOC is 0%, a second region in which the rate of change is greater than the specific value and the SOC is 100%, and a third region in which the rate of change is less than the specific value and is between the first region and the second region, the processor: uses the specific region as the third region, and when the integrated current value calculated within the third region exceeds the threshold, corrects the SOC by subtracting the correction amount from the SOC estimated after the integrated current value exceeds the threshold, and causes the display to display the second SOC for display. The display control device according to claim 1.

4. The display control device according to claim 3, wherein the processor resets the integrated current value when the estimated SOC is in the first region or when the estimated SOC is in the second region.

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