JP2019208332A - Battery monitoring device for electric vehicle - Google Patents

Abstract

To provide a battery monitoring device that can prepare a charging plan appropriately while suppressing power consumption and charge a battery at appropriate timing according to change in a driving situation.SOLUTION: Charging plan preparing means 142 of a battery monitoring device 140 instructs travel route preparing means 133 for charging to simplify information on a travel route in which estimated residual electricity of a battery 104 is equal to or above a predetermined value on the basis of information on a plurality of travel routes in a section on a travel route for charging from a present position acquired from the travel route preparing means 133 for charging to a destination location via a charging station and vehicle information acquired from vehicle information collecting means 141. Thereafter, the plan preparing means 142 prepares a charging plan corresponding to the time of charging the battery 104, on the basis of the simplified travel route for charging acquired from the travel route preparing means 133 for charging.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a battery monitoring device for an electric vehicle mounted on an electric vehicle using an electric motor driven by power supply from a rechargeable battery as a power source.

  Conventionally, an electric vehicle such as an electric vehicle using an electric motor as a power source, an engine of an internal combustion engine, and a hybrid vehicle using an electric motor as a power source has a battery mounted on a power source for driving the electric motor.

When an electric vehicle is driven using an electric motor powered by a battery as a power source, the fuel consumption of the internal combustion engine can be suppressed to zero, which is economical. In addition to this, the type of electric vehicle has been rapidly spreading in recent years because of its great merit, such as being able to suppress CO _{2 of the} greenhouse gas and reduce the effect on the natural environment.

  On the other hand, the battery has many problems related to the convenience of charging, for example, there are few places where the charging service is available on the go, and it takes a considerable time for charging. As countermeasures, efforts are being made to gradually resolve issues related to the convenience of charging, such as the installation of additional charging facilities in public facilities and commercial facilities, and the development of rapid charging devices. .

  However, the number of charging facilities is still small and the charging time is about 20 to 30 minutes. For this reason, the convenience regarding charge of a battery is not improved so much.

  Therefore, as another approach, reducing the power consumption of the battery for electric vehicles, reducing the charging frequency, using the internal combustion engine as a generator, utilizing the gradient of the road surface on which the vehicle is traveling For example, generating electricity by regeneration. Alternatively, a method of charging the battery while the electric vehicle is traveling has been proposed.

  In addition, for example, the remaining amount of battery power when a plurality of travel routes to the destination via the charging station at the departure point are searched by the navigation device, and the traveled route is searched for each destination. Are estimated respectively. And the method of displaying the battery information containing the estimated electric power remaining amount of the battery on a monitor is proposed (for example, refer patent document 1).

  In another example, a motor-assisted travel section that travels using the output of an electric motor and acquires a travel route information including the altitude to the destination of the electric vehicle, and a charge travel section that travels using only the output of the internal combustion engine. Are set based on the altitude of the route route. And the method of isolate | separating and controlling the driving | running by an electric motor and an internal combustion engine based on the set driving | running | working area is proposed (for example, refer patent document 2).

  If another example is given, the charge communication which mutually communicates the information which controls charge at the time of charge of a battery will be performed between an electric vehicle and charging equipment, and itinerary information including a travel route is sent to charging equipment. The charging facility transfers the itinerary information sent from the electric vehicle to the management center via the information communication network. Based on the itinerary information received from the charging facility, the management center creates a charging plan according to the travel route of the electric vehicle and acquires charging facility information of the charging facility at the planned charging site included in the charging plan. It is sent to the charging facility via the communication network. And as for the charging equipment, the method of transferring the acquired charging plan and charging equipment information to an electric vehicle by charge communication is proposed (for example, refer to patent documents 3).

JP 2017-175810 A Japanese Patent Laid-Open No. 2006-88440 Japanese Patent Laying-Open No. 2015-230719

  In the methods according to the above-mentioned patent documents, the ability to transmit and receive detailed travel route information in real time greatly affects the control accuracy. This is particularly important in the traveling state of the electric vehicle when the remaining amount of the battery is small compared to the case where the remaining amount of the battery is sufficient.

  In particular, a communication line for transmitting and receiving information on a travel route from a navigation device to a battery monitoring device, a control device, etc. in an electric vehicle has an upper limit of the communication capacity, and the travel route within a limited communication capacity. It is necessary to send and receive information. For example, in the method according to Patent Document 3, it is necessary to transmit / receive information on a travel route via a public line between a management center and an electric vehicle. For this reason, depending on the usage situation of the public line, there is a possibility that the communication capacity is significantly lower than the communication capacity of the communication line.

  Alternatively, when the power consumption of the battery is significantly increased due to a sudden change of destination or a change in the driving status of the electric vehicle, the method according to each of the above patent documents obtains a travel route for charging within a limited communication capacity. It takes time. Thereby, a charge plan cannot be created in a short time, and there is a possibility that the battery cannot be charged at an appropriate timing. In addition, there is a possibility that it is impossible to suppress power consumption in consideration of power consumption of the travel route and regenerative power.

  The present invention has been made to solve such a problem, and according to changes in operating conditions, it is possible to accurately create a charging plan while suppressing power consumption, and to charge a battery at an appropriate timing. It aims at providing the battery monitoring apparatus for electric vehicles.

  To achieve the above object, a battery monitoring device for an electric vehicle that monitors the remaining amount of power of a battery mounted on an electric vehicle according to the present invention collects vehicle information including a monitoring result of the remaining amount of power of the battery. A plurality of sections on the charging travel route for going from the current location of the electric vehicle to the destination via the charging station from the collection means and the charging travel route creation means provided in the navigation device mounted on the electric vehicle. Based on the travel route information and the vehicle information, the charging travel route creation means is instructed to simplify the travel route information in which the estimated remaining battery power is equal to or greater than a predetermined value. Charging plan creation means for creating a charging plan based on the charging travel route after the simplification process acquired from the charging travel route creation means; Equipped with a.

  According to the present invention, according to the above-described configuration, it is possible to accurately create a charging plan while suppressing power consumption in accordance with changes in the driving situation, and to charge the battery at an appropriate timing.

It is the block diagram which attached | subjected the display image by a navigation apparatus, and showed the whole structure of the electric vehicle carrying the battery monitoring apparatus for electric vehicles which concerns on Embodiment 1 of this invention, and a navigation apparatus. FIG. 2 is a flowchart showing an operation process of a charging travel route creation means provided in a navigation device mounted on the electric vehicle of FIG. 1. FIG. It is a flowchart which shows the operation process of the charge plan preparation means with which the battery monitoring apparatus for electric vehicles of FIG. 1 is equipped. It is a flowchart which shows the operation | movement process of the electric power generation instruction | indication means with which the battery monitoring apparatus for electric vehicles of FIG. 1 is equipped. It is the schematic diagram which showed the display image by the navigation apparatus which received the instruction | indication which simplifies the information of the driving | running | working route by the battery monitoring apparatus for electric vehicles of FIG. 1 with the conventional case.

  Hereinafter, embodiments of the battery monitoring device for an electric vehicle according to the present invention will be described in detail with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 shows the overall configuration of an electric vehicle 100 equipped with an electric vehicle battery monitoring device (hereinafter referred to as a battery monitoring device) 140 and a navigation device 130 according to Embodiment 1 of the present invention. It is the block diagram which attached and showed the image.

  Referring to FIG. 1, this electric vehicle 100 includes a vehicle speed sensor 102, a drive motor 103, a battery 104, a generator (motor) 105, a power generation engine 106, drive wheels 107, a battery monitoring device 140, and a navigation device 130. It is configured with.

  The vehicle speed sensor 102 detects the traveling speed of the electric vehicle 100. The driving motor 103 generates a driving force necessary for traveling the electric vehicle 100. The battery 104 supplies power as a power source for the drive motor 103. The generator 105 charges the battery 104 with electric power. The power generation engine 106 drives the power generator 105. The driving wheel 107 transmits the driving force generated by the driving motor 103 to the road surface. The battery monitoring device 140 performs power management of the battery 104. The navigation device 130 predicts the travel route of the electric vehicle 100 and notifies the driver.

When driving the electric vehicle 100, the driver drives the driving motor 103 using the battery 104 as a power source by performing an accelerator pedal operation. The driving force generated by the driving motor 103 is transmitted to the driving wheels 107, and the driving wheels 107 that are in contact with the road surface rotate, whereby the electric vehicle 100 travels. Usually, the electric vehicle 100 travels with the electric power of the battery 104. By shortening the time for driving the power generation engine 106, fuel consumption can be suppressed, which leads to suppression of greenhouse gas (CO ₂ ) emission in terms of environment.

  The battery monitoring device 140 monitors the state of charge of the battery 104, and transmits a power generation instruction to the power generation engine 106 to drive the power generation engine 106 when the remaining power level of the battery 104 becomes a certain value or less. The power generated by the power generation engine 106 is transmitted to the power generator 105, and the power generator 105 is driven. When the generator 105 is driven, the generated power is input to the battery 104 and the battery 104 is charged.

  The battery monitoring device 140 includes a vehicle information collection unit 141, a charging plan creation unit 142, and a power generation instruction unit 143.

  The vehicle information collection unit 141 collects vehicle information including the detection result of the traveling speed of the electric vehicle 100 and the monitoring result of the remaining power of the battery 104. The charging plan creation means 142 includes a plurality of charging routes in the section on the charging travel route for traveling from the current location of the electric vehicle 100 to the destination via the charging station from the charging travel route creation means 133 provided in the navigation device 130. Get information on driving routes. Further, the charging plan creation unit 142 receives the vehicle information transmitted from the vehicle information collection unit 141.

  Furthermore, the charging plan creation unit 142 simplifies the traveling route information in which the estimated remaining power of the battery 104 is greater than or equal to a predetermined value based on the information. The creation unit 133 is instructed. Thereafter, the charging plan creating unit 142 creates a charging plan based on the charging traveling route after the simplification process acquired from the charging traveling route creating unit 133.

  The information on the charging travel route R1 in FIG. 1 indicates a state after the simplification process has already been performed as instructed by the charging plan creation unit 142. The information on the traveling route R1 for charging indicates the current location PL of the electric vehicle 100, the charging station CS, the destination PD, the remaining amount RAM for the remaining amount of power of the battery 104, the remaining amount RAS, and the passing points P1 to P12. Has been. In the following, the remaining power of the battery 104 is simply referred to as the remaining battery power as appropriate.

  The power generation instruction unit 143 outputs a power generation instruction for operating the generator 105 to charge the battery 104 based on the position information from the position information detection unit 132 provided in the navigation device 130 and the charging plan. .

  The navigation device 130 includes a travel route prediction unit 131, a position information detection unit 132, a charging travel route creation unit 133, and a charging station information management unit 134.

  The position information detection means 132 acquires current location information of the electric vehicle 100 by using a map matching function that corrects the estimated position using the map information. The travel route prediction unit 131 acquires the current location information of the electric vehicle 100 from the position information detection unit 132 and also acquires the vehicle speed information of the electric vehicle 100 from the vehicle information collection unit 141. Then, the travel route prediction unit 131 calculates a plurality of travel routes from the current location to the destination based on these pieces of information. Further, the travel route predicting means 131 calculates the travel probability for each travel route from the past travel history of the driver.

  The charging station information management means 134 manages facility information having environmental facilities capable of charging the battery 104 in a database.

  The charging travel route creation unit 133 acquires each travel route from the travel route prediction unit 131, vehicle speed information of the vehicle information from the vehicle information collection unit 141, and position information of the charging station from the charging station information management unit 134. Then, the charging travel route creation means 133 creates information on the charging travel route R1 based on the acquired information. However, when creating the information on the charging travel route R1, information on the latest charging traveling route R1 obtained by simplifying the traveling route is created according to the remaining battery level according to an instruction from the charging plan creation unit 142. .

  FIG. 2 is a flowchart showing an operation process of the charging travel route creating means 133 provided in the navigation device 130. This operation process shows a charge travel route creation process.

  Referring to FIG. 2, when the operation process of the charging travel route creation unit 133 is started, first, in step S201, the charging travel route creation unit 133 sends information on the charging travel route R1 from the charging plan creation unit 142. The request to send is received. Next, the process proceeds to step S <b> 202, and the charging travel route creation unit 133 acquires travel prediction route information from the travel route prediction unit 131. Here, the predicted travel route includes passing point position information, predicted passing point arrival time, via probability, and a route between passing points.

  In step S 203, the charging travel route creation unit 133 acquires the position information of the charging station from the charging station information management unit 134. Thereafter, the process proceeds to step S204, and the charging travel route creating means 133 adds the position of the charging station CS near the passing point on the predicted travel route, the route information to the charging station CS, and the predicted arrival time.

  Subsequently, the process proceeds to step S <b> 205, and the charging travel route creation unit 133 acquires an estimated time when the remaining battery level is equal to or less than the threshold value from the charging plan creation unit 142. Thereafter, the process proceeds to step S206, in which the charging travel route creation means 133 has a low passing probability and route information out of the passing points and route information that are expected to reach before the estimated time when the remaining battery level is less than or equal to the threshold. Is deleted and the travel prediction route is updated.

  Further, proceeding to step S207, the charging travel route creation means 133 predicts travel by thinning out the passing points and route information that are expected to reach before the estimated time when the remaining battery level is equal to or less than the threshold. Update the route.

  Thereafter, the process proceeds to step S208, where the charging travel route creating means 133 includes the position information of the charging station CS that is expected to reach before the estimated time when the remaining battery level is equal to or less than the threshold value, the route information to the charging station CS, Is deleted. In this manner, the charging travel route creation unit 133 executes the travel prediction route simplification process based on the remaining battery level in steps S206 to S208.

  Finally, proceeding to step S209, the charging travel route creation unit 133 transmits the created travel route to the charging plan creation unit 142 as a charging travel route. Through such a processing procedure, the charging travel route creation process ends.

  Referring to the information on the charging travel route R1 in FIG. 1, information on the travel route via the charging station CS located in the vicinity from the current location PL of the electric vehicle 100 to the destination PD is added. . The travel section of the battery 104 with a large remaining amount of RAM and having a low travel probability, that is, route information relating to the passing point P1, the passing point P2, the passing point P3, the passing point P4, and the passing point P9 is deleted. Is done. The route information to be deleted is indicated by a dotted line.

  On the other hand, the travel section of the battery 104 having a large remaining amount of RAM and having a high travel probability, that is, route information relating to the passing point P5 → the passing point P6 → the passing point P7 → the passing point P8 → the passing point P9. Is converted to a travel route that is simplified by omitting the passing points P6 and P8. The route information to be simplified is indicated by a thick solid line.

  Further, the travel section of the battery 104 with a small remaining amount of RAS, that is, the route information from the passing point P9 → the passing point P10 → the passing point P11, without omitting the passing point, can be used as detailed route information without being omitted. Provide information on R1.

  In addition, the travel section to the destination PD after passing through the charging station CS, that is, the route information relating to the passing point P11 → the passing point P12 → the destination PD may be charged for a sufficient time at the charging station CS. Guessed. Accordingly, the information on the travel route R1 for charging is created so that the information on the passing point P12 determined to be the remaining amount RAM of the battery 104 is omitted and the route information on the travel section is simplified.

  The charging plan creation unit 142 transmits the time when the current battery remaining amount becomes a predetermined value or less and the position information thereof to the charging travel route creation unit 133. Then, the charging plan creation unit 142 obtains the charging travel route R1 from the current location PL information of the latest electric vehicle 100 to the destination PD from the charging travel route creation unit 133. The charging plan creating unit 142 creates a charging plan for the electric vehicle 100 based on the latest charging traveling route R1 acquired from the charging traveling route creating unit 133.

  FIG. 3 is a flowchart showing an operation process of the charging plan creation unit 142 provided in the battery monitoring device 140. This operation process is a charging plan update process.

  Referring to FIG. 3, when the operation process of the charging plan creation unit 142 starts, first, in step S301, the charging plan creation unit 142 uses the time when the current remaining battery level becomes equal to or less than a certain value and the position information thereof for charging. It transmits to the travel route creation means 133. The battery remaining amount is obtained from the vehicle information collecting means 141, and the position information is obtained from the charging travel route creating means 133. Next, proceeding to step S302, the charging plan creating unit 142 makes a charging traveling route transmission request to the charging traveling route creating unit 133.

  In step S303, the charging plan creation unit 142 receives the charging travel route R1 from the charging travel route creation unit 133. Thereafter, the process proceeds to step S304, and the charging plan creation unit 142 performs traveling power consumption estimation based on the traveling route R1 for charging.

  Then, it progresses to step S305 and the charge plan preparation means 142 performs regenerated electric power estimation based on the driving | running route R1 for charge. Thereafter, the process proceeds to step S306, and the charging plan creation unit 142 estimates the charging power at the charging station CS based on the charging travel route R1.

  In step S 307, the charging plan creating unit 142 receives the current remaining amount of the battery 104 included in the vehicle information from the vehicle information collecting unit 141. Thereafter, the process proceeds to step S308, where the charging plan creation unit 142 subtracts the estimated traveling power consumption from the remaining power of the battery 104, and then adds the estimated regenerative power and the estimated charging power, thereby charging charging. The remaining amount of the battery 104 on the route R1 is calculated. In other words, the charging plan creation unit 142 subtracts the traveling power consumption from the current power of the battery 104 to estimate the remaining power of the battery 104 on the charging traveling route R1, and then calculates the regenerative power and charging power. Add.

  Finally, proceeding to step S309, the charging plan creation unit 142 creates a charging plan based on the time when the remaining amount of the battery 104 on the charging travel route R1 becomes equal to or less than a certain value and the travel route information. However, when a passing point where the remaining amount of the battery 104 becomes 0 is detected, the previous passing point is set as a power generation instruction point in the charging plan. The charging plan update process is completed through such a processing procedure.

  The power generation instruction unit 143 acquires the position information of the electric vehicle 100 from the position information detection unit 132 and acquires the charging plan from the charging plan creation unit 142. Then, when the electric vehicle 100 reaches the power generation instruction point in the charging plan, the power generation instruction unit 143 operates the power generation engine 106 to drive the generator 105 to charge the battery 104.

  FIG. 4 is a flowchart showing an operation process of the power generation instruction unit 143 provided in the battery monitoring device 140. This operation process indicates a power generation instruction process.

  Referring to FIG. 4, when the operation process of the power generation instruction unit 143 starts, first, in step S <b> 401, the power generation instruction unit 143 acquires the position information of the electric vehicle 100 from the position information detection unit 132. Next, proceeding to step S <b> 402, the power generation instruction unit 143 acquires a charging plan from the charging plan creation unit 142.

  Furthermore, it progresses to step S403 and the electric power generation instruction | indication means 143 collates a charging plan and the positional information on the electric vehicle 100. FIG. Thereafter, the process proceeds to step S404, and the power generation instruction unit 143 determines whether or not the position of the electric vehicle 100 has reached the power generation point. As a result of the determination, if the position of the electric vehicle 100 has reached the power generation point, the process proceeds to step S405, and the power generation instruction unit 143 instructs the power generation engine 106 to generate power, and then ends the operation process. . When the position of the electric vehicle 100 has not reached the power generation point, the power generation instruction unit 143 ends the operation process as it is. Through such a processing procedure, the power generation instruction processing ends.

  As described above, in the battery monitoring device 140, in accordance with an instruction from the charging plan creation unit 142, the travel route creation unit 133 uses the travel route creation unit 133 to obtain the passing point information of the travel section estimated to have a large remaining amount of the battery 104. Delete every time, thin out every few points. Thereby, the traveling route R1 for charging is simplified, and the communication capacity for acquiring the traveling route R1 for charging is suppressed.

  In addition, the driving route is changed by the driver's sudden change of the destination PD, or the driving situation of the electric vehicle 100 of the driver is changed, and the power consumption of the battery 104 is suddenly increased. Even when the charging plan of the battery 104 is forced to change, it becomes possible to cope with it. Such a case can be dealt with by obtaining the latest charging travel route R1 in a short time and updating the charging plan of the battery 104. In any case, according to a change in the driving state of the electric vehicle 100, a charging plan can be created accurately while suppressing power consumption, and the battery 104 can be charged at an appropriate timing.

  FIG. 5 is a schematic diagram showing a display image by the navigation device 130 that has received an instruction to simplify the travel route information by the battery monitoring device 140 in comparison with the conventional case.

  Referring to FIG. 5, in the conventional method shown in the region E1, when the battery monitoring device obtains the charging travel route R from the navigation device, the charging travel route R is set to one time from time t1 to time t4. It can only be received.

  For this reason, even when the power consumption of the battery 104 fluctuates significantly due to the change of the destination PD or the change of the driving condition of the electric vehicle 100 from the time t1 to the time t4, it takes time to acquire the charging travel route R. Is required. As a result, it takes time to update the charging plan, and there is a possibility that a power generation instruction cannot be given to the generator 105 at an appropriate timing.

  On the other hand, in the method according to the first embodiment shown in the region E2, the charging travel route R1 is acquired from the time t1 to the time t2 in the time from the time t1 to the time t4, and from the time t2 to the time t3. The travel route R2 for charging can be acquired in time. Furthermore, the charging travel route R3 can be acquired from the time t3 to the time t4.

  That is, three charging travel routes R1, R2, and R3 can be acquired from time t1 to time t4. The reason is that the display process on the display unit by the navigation device 130 is performed in a short time as a result of the communication capacity being suppressed by the simplification process. As a result, even when the power consumption of the battery 104 fluctuates significantly due to the change of the destination PD or the change of the driving condition of the electric vehicle 100, the updated travel routes R1, R2, and R3 can be set in a short time. Can be acquired. As a result, the charging plan can be updated at an appropriate timing, and a power generation instruction can be given to the generator 105 at an appropriate timing.

  DESCRIPTION OF SYMBOLS 100 Electric vehicle, 102 Vehicle speed sensor, 103 Drive motor, 104 Battery, 105 Generator, 106 Power generation engine, 107 Drive wheel, 130 Navigation device, 131 Travel route prediction means, 132 Position information detection means, 133 Charge travel route Creation means, 134 Charging station information management means, 140 Battery monitoring device, 141 Vehicle information collection means, 142 Charging plan creation means, R, R1, R2, R3 Charging travel route.

To achieve the above object, a battery monitoring device for an electric vehicle that monitors the remaining amount of power of a battery mounted on an electric vehicle according to the present invention collects vehicle information including a monitoring result of the remaining amount of power of the battery. A plurality of sections on the charging travel route for going from the current location of the electric vehicle to the destination via the charging station from the collection means and the charging travel route creation means provided in the navigation device mounted on the electric vehicle. Based on the travel route information and the vehicle information, the charging travel route creation means is simplified so as to simplify the travel route information in which the estimated remaining battery power is equal to or greater than a predetermined value. reduction after the instruction, based on the charging driving route after the obtained simplified process from charging the traveling route generation section, charging plans work to create a charging plan And means, the charging plan creation means, by performing the simplified instruction from the charging traveling route generation section, running probability of multiple driving route calculated from the past travel history, and the remaining battery power Based on the above, a charge travel route that is deleted with respect to a passing point and route information that has a battery remaining amount higher than a predetermined value and that has a low via probability is received as a charge travel route after the simplification process. .

Claims (5)

A battery monitoring device that monitors the remaining power of a battery mounted on an electric vehicle,
Vehicle information collecting means for collecting vehicle information including a monitoring result of the remaining power of the battery;
A plurality of runs in a section on the charging travel route for going from the current location of the electric vehicle to the destination via the charging station acquired from the charging travel route creating means provided in the navigation device mounted on the electric vehicle. Based on the route information and the vehicle information, to the travel route creation means for charging so as to simplify the travel route information in which the estimated remaining power of the battery is equal to or greater than a predetermined value. An electric vehicle battery monitoring device comprising: charge plan creation means for creating a charge plan based on the charge travel route after the simplification process acquired from the charge travel route creation means. The charging plan creation means subtracts the travel power consumption from the current battery power, and adds the regenerative power and the charge power to estimate the remaining power of the battery on the charge travel route. The battery monitoring apparatus for electric vehicles as described in. The charging plan creation means, by instructing the charging travel route creation means, simplifies the information on the charging travel route, and by thinning out the passing points, The battery monitoring device for an electric vehicle according to claim 1 or 2, wherein the amount is reduced. The charging plan creation means, by instructing the charging travel route creation means, when simplifying the information of the charging travel route, by reducing the information of the travel route with a low travel probability, The battery monitoring device for an electric vehicle according to any one of claims 1 to 3, wherein the amount of information on a charging travel route is reduced. Power generation instruction means for outputting a power generation instruction for operating the generator and charging the battery based on the position information generated by the position information detection means provided in the navigation device and the charging plan; ,
The battery monitoring device for an electric vehicle according to any one of claims 1 to 4, further comprising:

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