JP2019083671A - Vehicular display device - Google Patents

Abstract

To provide a vehicular display device that displays a travellable distance reflecting a latest travelling situation as a residual quantity of a battery gets low and urges an occupant to travel while suppressing consumption of electricity, and can reduce anxieties about shortage of electricity.SOLUTION: The vehicular display device comprises at least calculating means that calculates a travellable distance of a vehicle on the basis of a residual quantity of a battery and display means that displays the travellable distance, which further comprises correcting means that changes an interval of updating the travellable distance on the basis of the residual quantity of the battery.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display device that notifies a driver of a distance that can be traveled from a current point based on a battery remaining amount of an electric vehicle and a history of traveling conditions.

  In recent years, electric vehicles (EVs) that are driven by driving a motor by power stored in a battery and do not emit exhaust gas containing harmful substances at the time of driving have attracted attention. As a battery mounted on the EV, a secondary battery such as a lithium ion battery capable of being repeatedly charged and discharged is used, and the state of charge (SOC) of the battery is constantly managed. The display unit provided in the EV displays a battery remaining amount represented by SOC, a travelable distance calculated based on the battery remaining amount, an average electricity cost of the EV, and the like. Then, for example, when the battery remaining amount becomes equal to or less than a preset reference value, a display for prompting the driver to charge or the like is performed.

  In the EV, when it becomes impossible to drive when the battery remaining amount becomes zero due to the absence of electricity, it is necessary to move the vehicle to a chargeable place using another vehicle, and the vehicle driven by the engine becomes so-called out of gas. It can not be returned to the state where it can easily travel as compared to the case where In addition, compared with the distance that a vehicle running with an engine can travel without refueling, the distance that an EV can travel without charging is short, for example, traveling environment such as road slope or congestion, air conditioners, etc. The travelable distance also varies depending on the operating conditions.

  For these reasons, the driver of the EV tends to be strongly aware of the possible travel distance, and when the battery remaining amount decreases and a display prompting charging is made, for example, the power of the equipment is controlled to suppress the operation of the equipment voluntarily Drive to reduce consumption.

  In order to prevent power loss in EV, for example, as in Patent Document 1, a technology that identifies an area where the remaining battery capacity is likely to decrease and informs the driver as a power shortage caution area based on SOC information of multiple EVs It has been known. In addition, depending on the congestion status of the road, there is a possibility that there will be a shortage of electricity before arriving at the charging facility. To avoid this, as in Patent Document 2, from the occurrence location of the traffic congestion on the travel route to the destination A technology is known that displays a charging facility close to the current location.

JP, 2015-69259, A Unexamined-Japanese-Patent No. 2016-217769

  When the driver of the EV travels to the charging facility when the remaining battery capacity decreases while traveling, even though the travelable distance is displayed on the display unit, the actual travelable distance depends on the traveling environment etc. I may feel anxious about the power shortage. Then, since the travelable distance to be displayed is calculated based on the battery remaining amount and the history of the past travel conditions, even if the driver performs driving so as to reduce power consumption, the latest travel situation is Since it is not immediately reflected on the travelable distance, the lesser the displayed travelable distance, the greater the anxiety.

  However, the technology of Patent Document 1 does not display attention information of lack of electricity based on the remaining amount of battery of the vehicle, and the technology of Patent Document 2 does not display the current charging point to the nearest charging facility. Does not work. Therefore, even with the techniques of Patent Documents 1 and 2, even if the driver of the EV is urged to travel to reduce the power consumption, there may be a case where the anxiety of the power shortage can not be reduced.

  An object of the present invention is a display device for a vehicle capable of reducing travel of power consumption by displaying a travelable distance in which the latest travel situation is reflected as the battery remaining amount decreases, and reducing anxiety of power shortage. It is to provide.

  The invention according to claim 1 is a display device for a vehicle, comprising: calculating means for calculating the travelable distance of the vehicle based on at least the remaining amount of the battery; and display means for displaying the travelable distance. And correcting means for changing the update interval of the travelable distance on the basis of.

  According to the above configuration, it is possible to adjust the degree of reflection of the latest traveling state to be reflected on the travelable distance by changing the update interval of the travelable distance based on the remaining amount of the battery. Therefore, when the remaining amount of the battery becomes large, the anxiety of the absence of power can be displayed with a high travel distance with high accuracy reflecting the latest traveling situation, and the anxiety can be reduced. In addition, the display of the travelable distance reflecting the most recent travel situation urges the driver to voluntarily drive to reduce power consumption, and allows the driver to drive when power consumption is suppressed. It can be recognized that the reduction of distance becomes gentle or the distance that can be traveled is extended, and the anxiety of the power shortage can be effectively reduced.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the correction means shortens the update interval as the remaining amount of the battery decreases.

  According to the above configuration, as the battery remaining amount decreases, the update interval of the travelable distance can be shortened and the travelable distance reflecting the latest travel situation can be displayed, so that the driver voluntarily consumes power. In addition to prompting the driver to hold down driving, it is possible to reduce fear of lack of electricity.

  The invention of claim 3 is characterized in that, in the invention of claim 2, the correction means shortens the update interval as the operation rate of the equipment driven by the battery increases.

  According to the above configuration, as the operation rate of the accessory increases, that is, as the power consumption of the accessory increases, the update interval of the travelable distance can be shortened to display the travelable distance reflecting the latest travel situation. Therefore, it is possible to urge the driver to perform an operation to reduce the power consumption voluntarily and to reduce the anxiety of the power shortage.

  According to the display device for a vehicle of the present invention, the travelable distance on which the latest travel situation is reflected is displayed as the battery remaining amount decreases, and driving is suppressed to reduce power consumption, and anxiety of power shortage can be reduced. is there.

It is a block diagram showing a schematic structure of a display for vehicles of the present invention. It is a figure which shows one example of the travel distance for average electricity-cost calculation changed based on SOC. It is a flowchart which shows update control of the display of a distance which can be traveled.

  Description of Embodiments An embodiment of the present invention will be described based on examples.

  As shown in FIG. 1, the display apparatus 1 for a vehicle includes a map information storage unit 2 that stores map information and information such as road signs and facilities on the map, and a position information acquisition unit 3 that acquires vehicle position information. A control unit 4 (calculation means) for performing control based on vehicle position information and the like, a display unit 5 (display means) capable of displaying map information and information calculated by the control unit 4 and the like are provided. The control unit 4 includes a CPU, a ROM, a RAM, etc., and the ROM stores various control programs and data, and the RAM is provided with a processing area used when the CPU performs a series of processing. ing. The vehicle display device 1 is mounted on an EV and communicably connected to an electronic control unit (ECU 10) for controlling the EV.

  The position information acquisition unit 3 acquires vehicle position information such as the current point of a vehicle equipped with the display device 1 for a vehicle based on GPS signals transmitted from a plurality of GPS satellites and input through the GPS antenna 7 Do. The vehicle position information, the information stored in the map information storage unit 2, and the vehicle information output from the ECU 10 are input to the control unit 4 of the vehicle display device 1, and the control unit 4 corresponds to the vehicle position. The map to be displayed is displayed on the display unit 5. The vehicle information output from the ECU 10 includes the vehicle speed V, the state of charge (SOC) of the battery, the power consumption Pc, and the like.

  Further, the control unit 4 calculates the travelable distance L based on the SOC output from the ECU 10, and causes the display unit 5 to display information such as the SOC and the calculated travelable distance L. The control unit 4 is provided with a correction unit 6 (correction unit) that changes the update interval of the travelable distance L based on the SOC. The SOC represents the current remaining battery capacity Wa [kWh] with respect to the total battery capacity W [kWh] specified in the specification as a percentage, and the remaining battery capacity Wa can be calculated from the SOC and the total battery capacity W .

Next, the travelable distance L will be described.
Based on the current remaining battery power Wa [kWh] and the current average power cost Eave [kWh / km], the control section 4 calculates the following expression (1) and the display section displays the travelable distance L [km]. Display on 5 The travelable distance L may be, for example, a numerical value display, or a circle with the travelable distance L as a radius centered on the current point may be displayed on the map.
L = Wa / Eave (1)

In order to calculate the average electricity consumption Eave, the control unit 4 integrates, for example, the electric power consumption Wc [kWh] by traveling at a predetermined time interval T [h] every 0.1 seconds. The amount of electric power used Wc [kWh] is the current electric power used Pc [kW] included in the vehicle information output by the ECU 10, and the predetermined time interval T = 0.1 second (−5 2.8e-5 [h]) Is obtained by the calculation of the following equation (2) by the control unit 4. The electric power Pc used is the sum of the electric power Pd [kW] used for traveling and the electric power Pe [kW] used for the battery-driven equipment such as an air conditioner, and the ECU 10 outputs these. If the used electric energy Wc is included in the vehicle information output by the ECU 10, this may be used.
Wc = Pc × T (2)

Then, based on the vehicle position information acquired by the position information acquiring unit 3, the control unit 4 integrates the used electric energy Wc acquired as shown in the following formula (3) until the EV travels, for example, 0.1 km as a predetermined distance. Integrated power amount Ws [kWh] is obtained.
Ws ← Ws + Wc (3)

Next, when the EV travels, for example, 0.1 km, the control unit 4 is 0.1 km ahead of the current point every time the vehicle travels 0.1 km as shown in the following equation (4) based on the integrated power amount Ws so far Calculate the section electricity cost E1 [kWh / km] of the section at the current point.
E1 = Ws / 0.1 (4)

  At this time, the value of the section electricity cost E1 calculated last time is set as the section electricity cost E2 of the section 0.2km to 0.1km before the current point, and the value of the section electricity cost E2 at the previous calculation is 0.3km before the current point to 0 For example, the section electricity cost E1500 is updated to the section electricity cost E3 of the section 2 km ago.

  The section electricity cost E1 is the sum of the traveling electricity cost Ed1 by the electric power used by the motor etc. for traveling and the equipment electricity cost Ee1 by the electric power used by the equipment, and the electricity used Pd for traveling and the air conditioner etc. Since the calculation is performed based on the power consumption Pe of the accessory, the traveling electricity cost Ed1 and the equipment electricity cost Ee1 are distinguished. That is, travel electricity expenses Ed1 to Ed1500 and equipment electricity expenses Ee1 to Ee1500 of a section every 0.1 km up to 150 km before the current point are stored. Therefore, it is possible to calculate the travelable distance when the equipment is not used based on the travel expenses Ed1 to Ed1500, and switch to the display of the travelable distances based on the travel expenses when the use of the equipment is stopped. It can also be done.

Next, the control unit 4 calculates the average electricity cost Eave in the traveling distance Lc [km] to the current point based on the following equation (5). En is the oldest section electricity cost determined to be used for calculation according to the travel distance Lc.
Eave = (E1 + E2 +... + En) / Lc (5)

  At this time, for example, as shown in FIG. 2, as the SOC output from the ECU 10 decreases, the correction unit 6 reduces the travel distance Lc (update interval) for calculating the average electricity cost Eave for calculating the travelable distance L. Change to The average electricity cost Eave is calculated based on the section electricity costs E1 to E1500 as Lc = 150 km when the SOC obtained from the ECU 10 is 95%, for example, and changed to Lc = 120 km when the SOC is 75%. Calculate based on E1 to E1200. Although FIG. 2 shows an example in which the SOC is divided into 10 steps for every 10% and the travel distance Lc for calculating the average electricity cost Eave is changed by 15 km for each step, the way of change is not limited to this . Alternatively, the average electricity cost Eave may be calculated for each stage (for each traveling distance Lc), and the average electricity cost Eave calculated with the traveling distance Lc corresponding to the time when the SOC is acquired may be selected.

  Then, the control unit 4 causes the display unit 5 to display the travelable distance L [km] obtained by the calculation of the equation (1) on the basis of the calculated average electricity cost Eave.

Further, the correction unit 6 can further shorten the traveling distance Lc changed based on the SOC, for example, based on the latest equipment power cost Ee1 up to the current point. Since the power consumption increases and the equipment power consumption Ee1 increases as the operation rate of the accessory increases, the travel distance Lc changed based on the SOC is reduced to the travel distance Lc 'based on the following equation (6). By calculating the average power consumption Eave based on the shortened travel distance Lc ′, the travelable distance L in which the increase in the power consumption of the accessory is reflected is obtained.
Lc '= Lc * (Ed1 / (Ed1 + Ee1)) (6)

  Next, the update control of the display of the travelable distance L will be described based on the flowchart of FIG. Si (i = 1, 2,...) In the figure represents a step.

  First, in S1, it is determined whether the ignition SW is ON to determine whether the EV is in a travelable state. If the determination is Yes, the process proceeds to S2, and if the determination is No, the determination of S1 is repeated.

  Next, in S2, in order to determine that the EV is traveling, it is determined whether the vehicle speed V is greater than 0 km / h. When the determination is Yes, the process proceeds to S3, and when the determination is No, the process returns to S1.

  Next, in S3, the current amount of used power Wc is acquired based on the above equation (2), and the process proceeds to S4. Then, at S4, the electric power consumption Wc is integrated based on the equation (3) to calculate the integrated electric energy Ws, and the process proceeds to S5. The current integrated power amount Ws is obtained by adding the used power amount Wc acquired in S3 to the integrated power amount Ws at the time of previous integration by a predetermined time interval T before.

  Next, in S5, it is determined whether the EV has traveled, for example, 0.1 km as a predetermined distance. The distance traveled by the EV is acquired based on the position information acquired by the position information acquisition unit 3. However, if the distance traveled is included in the vehicle information output by the ECU 10, this can also be used. When the determination is Yes, the process proceeds to S6, and when the determination is No, the process returns to S2.

  Next, in step S6, the section electricity costs E2 to E1500 are updated, and the section electricity cost E1 when traveling a distance of 0.1 km to the current point is calculated based on the above equation (4), and the process proceeds to S7. Next, in S7, the SOC output from the ECU 10 is acquired, and the process proceeds to S8.

  Next, in S8, the correction unit 6 changes the travel distance Lc for calculating the average electricity cost Eave based on the SOC, and the process proceeds to S9. The travel distance Lc changed in S8 may be changed to the travel distance Lc 'as in the above-described equation (6), and the process may proceed to S9. Then, in S9, the average electricity cost Eave is calculated based on the above equation (5), and the process proceeds to S10. Since the travel distance Lc for calculating the average electricity cost Eave is changed to be short (the update interval is shortened), the latest travel state is reflected in the average electricity cost Eave.

  Next, in S10, the travelable distance L is calculated based on the remaining battery charge Wa and the calculated average power cost Eave as in the above-mentioned equation (1), and the process proceeds to S11. Since the travelable distance L is calculated using the average electricity cost Eave reflecting the most recent traveling state, it is possible to obtain the travelable distance L with high accuracy reflecting the most recent traveling state.

  Next, in S11, the calculated travelable distance L is displayed on the display unit 5, and the process proceeds to S12. Then, in S12, it is determined whether or not the ignition SW has been turned OFF. When the determination is Yes, the update control of the display of the possible travel distance L is ended, and when the determination is No, the process proceeds to S13, resets the integrated power amount Ws to 0 kWh, and then returns S2.

Next, the operation and effects of the present invention will be described.
The display apparatus 1 for vehicles of this invention can change the reflection degree of the latest driving | running | working state reflected on the distance L which can be traveled by changing the update interval of the distance L which can be traveled according to the battery remaining charge. Therefore, it is possible to reduce the anxiety by causing the display unit 5 to display the travelable distance L with high accuracy reflecting the latest traveling situation when the battery remaining amount in which the anxiety of the power shortage becomes large is reached. In addition, the display of the travelable distance L reflecting the most recent driving situation urges the driver to voluntarily drive to reduce power consumption, and also causes the driver to drive when power consumption is suppressed. Since it is possible to recognize that the reduction of the possible distance L becomes gentle or the travelable distance L is extended, it is possible to effectively reduce the anxiety of the lack of electricity.

  Further, as the battery remaining amount decreases, the travel distance Lc, which is the update interval of the travelable distance L, can be changed to be shorter, and the travelable distance L with high accuracy reflecting the latest travel situation can be displayed. Can voluntarily drive to reduce power consumption and reduce anxiety of power shortage.

  Furthermore, the greater the operation rate of the equipment, the greater the power consumption of the equipment, that is, the larger the equipment electricity cost, the shorter the update interval of the travelable distance L, and the travelable distance L reflects the most recent travel situation. As it can be displayed, it is possible to urge the driver to perform an operation to reduce the power consumption voluntarily and to reduce the anxiety of the power shortage.

Next, an example in which the above embodiment is partially changed will be described.
[1] The integrated power amount Ws may be calculated and stored for each travel distance of 0.1 km. In this case, the average electricity consumption Eave can be obtained by dividing the sum of the integrated power amount Ws by the travel distance Lc traveled by the integrated power amount Ws. Therefore, the travelable distance L can be calculated and displayed in the same manner as in the above embodiment, and the same effect can be obtained.
[2] It is also possible to further reflect the traveling situation by changing the interval at which the travelable distance L is calculated to be shorter.

  In addition, those skilled in the art can carry out the present invention in various modifications without departing from the spirit of the present invention, and the present invention also includes such modifications.

Reference Signs List 1 vehicle display device 2 map information storage unit 3 position information acquisition unit 4 control unit 5 display unit 6 correction unit

Claims (3)

A display device for a vehicle, comprising: calculating means for calculating a travelable distance of a vehicle based on at least a remaining amount of a battery; and display means for displaying the travelable distance.
A display apparatus for a vehicle, comprising: a correction unit configured to change an update interval of the travelable distance based on a remaining amount of the battery.   The vehicle display device according to claim 1, wherein the correction unit shortens the update interval as the remaining amount of the battery decreases.   The display apparatus for a vehicle according to claim 2, wherein the correction unit shortens the update interval as the operation rate of the accessory driven by the battery increases.

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