JP6636088B2 - Battery monitoring device for electric vehicles - Google Patents

Description

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

  2. Description of the Related Art Conventionally, electric vehicles 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 are equipped with a battery as a power source for driving the electric motor.

When the electric vehicle is driven by using an electric motor supplied by a battery as a power source, the fuel consumption of the internal combustion engine can be suppressed to zero, which is economical. Additionally, it is possible to suppress CO ₂ greenhouse gases, etc. can be reduced the influence of the natural environment, since merit is large, the type of electric vehicle according has rapidly spread in recent years.

  On the other hand, the battery has many problems related to the convenience of charging, such as few places where a charging service can be received on the go and considerable time required for charging. As a countermeasure, efforts are being made to gradually solve the issues related to the convenience of charging by installing additional charging facilities in public facilities, commercial facilities, etc., and by developing quick 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 of charging the battery has not been improved much.

  Therefore, as another approach, reducing the power consumption of the battery for the electric vehicle, reducing the charging frequency, using the internal combustion engine as a generator, and using the gradient of the road surface while the vehicle is running For example, power generation by regeneration is performed. Alternatively, a method of charging a battery while the electric vehicle is running has been proposed.

  In addition, for example, a plurality of travel routes to the destination via the charging station at the departure point are searched by the navigation device, and the remaining power of the battery when the vehicle travels to the destination on each searched travel route. Are estimated respectively. Then, a method has been proposed in which battery information including the estimated remaining power of the battery is displayed on a monitor (for example, see Patent Document 1).

  As another example, the information of the travel route including the altitude to the destination of the electric vehicle is acquired, and the motor-assisted travel section travels using the output of the electric motor, and the charging travel section travels only with the output of the internal combustion engine. Are set based on the altitude of the runway route. Then, there has been proposed a method of controlling the operation of the electric motor and the internal combustion engine separately based on the set traveling section (for example, see Patent Document 2).

  As another example, the charging communication is performed between the electric vehicle and the charging equipment to mutually communicate information for controlling charging when the battery is charged, and itinerary information including the travel route is sent to the 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 prepares a charging plan according to the traveling route of the electric vehicle and acquires the charging facility information of the charging facility at the planned charging site included in the charging plan, and obtains the information. Send to the charging facility via the communication network. As for the charging equipment, a method of transferring the acquired charging plan and charging equipment information to the electric vehicle by charging communication has been proposed (for example, see Patent Document 3).

JP 2017-175810 A JP-A-2006-88440 JP-A-2005-230719

  In the method according to each of the above patent documents, the ability to transmit and receive detailed traveling route information in real time greatly affects control accuracy. This point is particularly important under the running condition of the electric vehicle when the remaining amount of the battery is small as compared with the case where the remaining amount of the battery is sufficient.

  In particular, communication lines for transmitting and receiving travel route information from a navigation device to a battery monitoring device, a control device, and the like in an electric vehicle have an upper limit of communication capacity. Information needs to be sent and received. For example, in the method according to Patent Literature 3, it is necessary to transmit and receive travel route information via a public line between a management center and an electric vehicle. For this reason, depending on the usage status of the public line, there is a possibility that the communication capacity is significantly reduced below the communication capacity of the communication line.

  Alternatively, in a case where the power consumption of the battery is significantly increased due to a sudden change of destination or a change in the driving condition of the electric vehicle, the method according to each of the above-described Patent Documents obtains a travel route for charging within a limited communication capacity. It takes time. As a result, a charging plan cannot be created in a short time, and there is a possibility that charging of the battery cannot be controlled at an appropriate timing. Further, there is a possibility that it is not possible to suppress the power consumption in consideration of the power consumption and the regenerative power of the traveling route.

  The present invention has been made to solve such a problem, and it is possible to accurately create a charging plan while suppressing power consumption in accordance with a change in driving conditions, and to charge a battery at an appropriate timing. An object is to provide a battery monitoring device for an electric vehicle.

In order to achieve the above object, an electric vehicle battery monitoring device for monitoring the remaining power of a battery mounted on an electric vehicle according to the present invention is a vehicle information for collecting vehicle information including a result of monitoring the remaining power of a battery. Collection means and a plurality of sections in the section on the charging travel route for going from the current location of the electric vehicle to the destination via the charging station obtained from the charging travel route creating means provided in the navigation device mounted on the electric vehicle. Based on the traveling route information and the vehicle information, the charging traveling route creating means is simplified to simplify the processing of the traveling route in which the estimated remaining power of the battery 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, the charge traveling route deleted with respect to the passing point and the route information in which the remaining power of the battery is larger than the predetermined value and the passing probability is low is received as the charging traveling route after the simplification process. .

  According to the present invention, with the above-described configuration, a charging plan can be accurately created while suppressing power consumption in accordance with a change in operating conditions, and a battery can be charged at an appropriate timing.

1 is a block diagram showing an overall configuration of an electric vehicle equipped with a battery monitoring device for an electric vehicle and a navigation device according to Embodiment 1 of the present invention, with a display image provided by the navigation device. 2 is a flowchart illustrating an operation process of a charging traveling route creating unit provided in a navigation device mounted on the electric vehicle in FIG. 1. 2 is a flowchart showing an operation process of a charging plan creation unit provided in the electric vehicle battery monitoring device of FIG. 1. 2 is a flowchart illustrating an operation process of a power generation instruction unit provided in the battery monitoring device for an electric vehicle in FIG. 1. FIG. 2 is a schematic diagram showing a display image of a navigation device that has received an instruction to simplify information on a traveling route by the electric vehicle battery monitoring device of FIG. 1 in comparison with a conventional case.

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

  Referring to FIG. 1, the electric vehicle 100 includes a vehicle speed sensor 102, a driving motor 103, a battery 104, a generator (motor) 105, a power generating engine 106, a driving wheel 107, a battery monitoring device 140, and a navigation device 130. It is comprised including.

  Vehicle speed sensor 102 detects the traveling speed of electric powered vehicle 100. The driving motor 103 generates a driving force necessary for the electric vehicle 100 to travel. The battery 104 supplies electric power as a power source of the driving motor 103. Generator 105 charges 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 manages the power of the battery 104. The navigation device 130 predicts a traveling route of the electric vehicle 100 and notifies the driver of the traveling route.

When driving the electric vehicle 100, the driver operates the accelerator pedal to drive the driving motor 103 using the battery 104 as a power source. The driving force generated by the driving motor 103 is transmitted to the driving wheels 107, and the electric wheels 100 run by rotating the driving wheels 107 that are in contact with the road surface. Normally, the electric vehicle 100 runs on 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 reduction of greenhouse gas (CO ₂ ) emission in environmental aspects.

  The battery monitoring device 140 monitors the state of charge of the battery 104, and when the remaining power of the battery 104 becomes equal to or less than a certain value, transmits a power generation instruction to the power generation engine 106 and drives the power generation engine 106. 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 collecting unit 141, a charging plan creating unit 142, and a power generation instructing unit 143.

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

  Further, the charging plan creation means 142 performs a charging traveling route process based on the information so as to simplify the information on the traveling route in which the estimated remaining power of the battery 104 is equal to or more than a predetermined value. An instruction is issued to the creation unit 133. After that, the charging plan creating unit 142 creates a charging plan based on the simplified traveling route obtained from the charging traveling route creating unit 133.

  The information of the charging travel route R1 in FIG. 1 is indicated by the charging plan creation unit 142, and shows a state after the simplification processing has already been performed. The information of the charging travel route R1 indicates the current position PL of the electric vehicle 100, the charging station CS, the destination PD, the remaining amount of RAM for the remaining amount of power of the battery 104, the remaining amount of RAS, and the passing points P1 to P12. Have been. Hereinafter, the remaining power of the battery 104 will be 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 traveling route prediction unit 131, a position information detection unit 132, a charging traveling route creation unit 133, and a charging station information management unit 134.

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

  The charging station information management means 134 manages facility information having environmental facilities that can charge the battery 104, in the form of a database.

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

  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 processing indicates a charging travel route creation processing.

  Referring to FIG. 2, when the operation process of the charging travel route creating unit 133 is started, first, in step S201, the charging travel route creating unit 133 sends the information of the charging travel route R1 from the charging plan creating unit 142. Receive a transmission request. Next, the process proceeds to step S202, in which the charging travel route creating unit 133 acquires information on the travel predicted route from the travel route prediction unit 131. Here, the predicted traveling route includes passing point position information, predicted passing point arrival time, transit probability, and a route between passing points.

  Further, the process proceeds to step S203, and the charging traveling route creating unit 133 acquires the charging station position information from the charging station information managing unit 134. Thereafter, the process proceeds to step S204, and the charging travel route creating unit 133 adds the position of the charging station CS near the passing point on the predicted traveling route, the route information to the charging station CS, and the estimated arrival time.

  Subsequently, the process proceeds to step S205, and the charging travel route creating unit 133 acquires the estimated time at which the remaining battery capacity becomes equal to or less than the threshold from the charging plan creating unit 142. Thereafter, the process proceeds to step S206, in which the charging traveling route creating unit 133 determines that the passing point and the route information having a low passing probability among the passing points and the route information that are expected to arrive before the estimated time when the battery remaining amount becomes the threshold value or less. Is deleted, and the travel prediction route is updated.

  Further, the process proceeds to step S207, in which the charging travel route creating unit 133 extracts the pass points and route information that are expected to arrive before the estimated time when the remaining battery capacity becomes equal to or less than the threshold value by thinning out the pass points every several points. Update route.

  Thereafter, the process proceeds to step S208, and the charging travel route creating unit 133 determines the position information of the charging station CS that is expected to arrive before the estimated time when the remaining battery capacity becomes equal to or less than the threshold value, the route information to the charging station CS, Remove. In this way, the charging travel route creating unit 133 executes the process of simplifying the travel prediction route based on the remaining battery power in steps S206 to S208.

  Finally, proceeding to step S209, the charging travel route creating means 133 transmits the created travel route to the charging plan creating means 142 as a charging travel route. By going through such a processing procedure, the charging travel route creation processing 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 nearby between the current location PL and the destination PD of the electric vehicle 100 is added. . The travel section of the travel section of the RAM with a large amount of remaining power of the battery 104 and the travel probability of which the travel probability is low, that is, the route information relating to the passing point P1 → the passing point P2 → the passing point P3 → the passing point P4 → the passing point P9 is deleted. Is done. The route information to be deleted is indicated by a dotted line.

  On the other hand, it is a traveling section of the RAM with a large remaining amount of the battery 104 and a traveling section having a high traveling probability, that is, route information relating to the passing point P5 → passing point P6 → passing point P7 → passing point P8 → passing point P9. Is converted into a simplified traveling route with the passing points P6 and P8 omitted. The route information subjected to the simplification process is indicated by a thick solid line.

  Further, the travel section of the RAS with a low remaining amount of the battery 104, that is, the route information from the passing point P9 to the passing point P10 to the passing point P11 is a detailed route information without omitting the passing point. Provide information on R1.

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

  The charging plan creating means 142 transmits to the charging traveling route creating means 133 the time when the current battery remaining amount becomes equal to or less than a certain value and the position information thereof. Then, the charging plan creating unit 142 obtains the charging traveling route R1 to the destination PD from the latest information on the current location PL of the electric vehicle 100 from the charging traveling route creating 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 indicates 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 battery remaining amount becomes a certain value or less and the position information thereof for charging. This is transmitted to the traveling route creating means 133. The remaining battery level is obtained from the vehicle information collecting means 141, and the position information is obtained from the charging traveling route creating means 133. Next, the process proceeds to step S302, where the charging plan creation unit 142 requests the charging traveling route creation unit 133 to transmit a charging traveling route.

  Further, in step S303, the charging plan creating unit 142 receives the charging traveling route R1 from the charging traveling route creating unit 133. Thereafter, the process proceeds to step S304, in which the charging plan creation unit 142 estimates the traveling power consumption based on the charging traveling route R1.

  Subsequently, the process proceeds to step S305, and the charging plan creation unit 142 performs regenerative power estimation based on the charging travel route R1. Thereafter, the process proceeds to step S306, where the charging plan creation unit 142 estimates the charging power at the charging station CS based on the charging travel route R1.

  Further, the process proceeds to step S307, where the charging plan creation unit 142 receives the current remaining amount of the battery 104 included in the vehicle information from the vehicle information collection unit 141. Thereafter, the process proceeds to step S308, in which 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 to perform the charging traveling. The remaining amount of the battery 104 on the route R1 is calculated. In other words, the charging plan creation unit 142 estimates the remaining power of the battery 104 on the charging travel route R1 by subtracting the traveling power consumption from the current power of the battery 104, and then calculates the regenerative power and the charging power. Addition is performed.

  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 information on the travel route. However, when a passing point at which the remaining amount of the battery 104 becomes 0 is detected, the preceding passing point is set as the power generation instruction point in the charging plan. By going through such a processing procedure, the charging plan update processing ends.

  The power generation instructing unit 143 acquires the position information of the electric vehicle 100 from the position information detecting unit 132 and acquires the charging plan from the charging plan creating unit 142. Then, when the electric powered vehicle 100 reaches the power generation instruction point in the charging plan, the power generation instruction means 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 means 143 provided in the battery monitoring device 140. This operation processing indicates power generation instruction processing.

  Referring to FIG. 4, when the operation process of the power generation instruction unit 143 starts, first, in step S401, 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 S402, the power generation instructing unit 143 acquires a charging plan from the charging plan creating unit 142.

  Further, the process proceeds to step S403, and the power generation instruction unit 143 checks the charging plan with the position information of the electric vehicle 100. Thereafter, the process proceeds to step S404, and the power generation instruction unit 143 determines whether the position of the electric vehicle 100 has reached the power generation point. If the result of this determination is that the position of the electric vehicle 100 has reached the power generation point, the flow proceeds to step S405, in which the power generation instruction means 143 issues a power generation instruction to the power generation engine 106, and ends the operation processing. . When the position of the electric vehicle 100 has not reached the power generation point, the power generation instruction means 143 ends the operation processing as it is. Through such a processing procedure, the power generation instruction processing ends.

  As described above, in the battery monitoring device 140, in response to the instruction of the charging plan creation unit 142, the charging travel route creation unit 133 uses the travel section information of the travel section in which the remaining amount of the battery 104 is estimated to be large as the travel section. 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, a drastic change of the destination PD by the driver changes the driving route, or changes the driving condition of the electric vehicle 100 of the driver, and the power consumption of the battery 104 sharply increases. Even when the charging plan of the battery 104 needs to be changed, it is possible to respond. In such a case, the latest charging travel route R1 can be obtained in a short time and the charging plan of the battery 104 can be updated to cope with the problem. In any case, the charging plan can be accurately created while suppressing the power consumption according to the change in the driving situation of the electric vehicle 100, 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 information on the traveling route by the battery monitoring device 140 in comparison with the conventional case.

  Referring to FIG. 5, in the conventional method shown in the area E1, when the battery monitoring device acquires 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. You can only receive.

  Therefore, even if the power consumption of the battery 104 fluctuates significantly due to a change in the destination PD or a change in the driving condition of the electric vehicle 100 during the period from the time t1 to the time t4, it takes time to acquire the charging travel route R. I need it. 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 area 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 the charging travel route R1 is acquired from the time t2 to the time t3 from the time t2. The driving route R2 for charging can be acquired at the time. Furthermore, the charging travel route R3 can be acquired from the time t3 to the time t4.

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

  REFERENCE SIGNS LIST 100 electric vehicle, 102 vehicle speed sensor, 103 driving motor, 104 battery, 105 generator, 106 power generating engine, 107 driving wheel, 130 navigation device, 131 running route predicting means, 132 position information detecting means, 133 charging running 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.

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 result of monitoring the remaining power of the battery,
A plurality of travels in a section on a charging travel route for traveling from a current location of the electric vehicle to a destination via a charging station obtained 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, the charging travel route creating means is configured to simplify the travel route information in which the estimated remaining power of the battery is equal to or greater than a predetermined value. after the simplified instruction, based on the charging driving route after the obtained simplified process from the charging traveling route generation section, and a charging plan creation means for creating charge plan,
By performing the simplification instruction, the charging plan creation means, from the charging travel route creation means, to the travel probabilities of the plurality of travel routes calculated from past travel history, and to the remaining power of the battery. Based on the received power, the charging travel route having the remaining power of the battery greater than a predetermined value and having a low passing probability and deleted regarding the route information is received as the charging travel route after the simplification process. electric vehicle battery monitoring device for. The charging plan creation means estimates the remaining power of the battery on the charging travel route by subtracting the running power consumption from the current battery power and adding regenerative power and charging power. 4. The battery monitoring device for an electric vehicle according to claim 1. By instructing the charging travel route creating means, the charging plan creating means thins out passing points when simplifying the information of the charging travel route, thereby reducing the information of the charging travel route. 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 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 the charging travel route is reduced. Power generation instruction means for outputting a power generation instruction for operating a generator to charge 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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