JP2011142757A - Distance-to-empty calculation device and vehicle having the same - Google Patents

Abstract

Provided is a travelable distance calculation device that can easily and accurately predict a travelable distance reflecting a current travel state, and a vehicle using the travelable distance calculation device.
A travelable distance calculation device updates power consumption rate calculation means for calculating a latest power consumption rate per unit travel distance, a plurality of past power consumption rates recorded in a recording unit, and A power consumption rate updating unit for recording in the recording unit; and a travelable distance calculating unit for calculating a travelable distance from a plurality of power consumption rates recorded in the recording unit and the remaining battery level of the secondary battery. The power consumption rate update means updates the recorded plurality of power consumption rates to a predetermined default power consumption rate when a predetermined condition is satisfied, and otherwise, Of the plurality of past power consumption rates recorded in the recording unit, the latest power consumption rate calculated by the power consumption rate calculating means and the past power consumption rate having the largest deviation are updated to the latest power consumption rate. To do. The vehicle I has this.
[Selection] Figure 1

Description

  The present invention relates to a travelable distance calculating device and a vehicle using the same.

  2. Description of the Related Art In recent years, an electric vehicle that travels by driving a motor with electric power from a secondary battery has attracted attention in terms of non-pollution. Since the mileage of an electric vehicle is shorter than that of a gasoline vehicle that is driven by an engine that uses gasoline as fuel, it is necessary to calculate an accurate mileage and to display the mileage accurately. ing.

  In this case, it is difficult for an electric vehicle to accurately measure the amount of remaining electricity compared to a gasoline vehicle that physically measures the amount of remaining gasoline. Moreover, since the remaining electric power may increase by performing regenerative driving, it is difficult to accurately measure the remaining electric power, and as a result, it is difficult to accurately calculate the travelable distance.

  Thus, conventionally, in an energy management system for an electric vehicle that performs energy management by collecting and analyzing vehicle data accumulated in a database, unit electric energy for each region of a map with motor command torque and motor rotation speed as axes. The fuel mileage map registration means for calculating the hit mileage as fuel efficiency and registering it in the fuel efficiency map of the database, and for each region of the map centered on the motor command torque and the motor rotation speed, for each registration in the database Based on the frequency map registration means for calculating the number of additional data as a frequency representing the driving state and registering it in the frequency map of the database, the fuel consumption map, the power history by the frequency map, and the driving history, the remaining power of the current vehicle A travelable distance predicting means for predicting a travelable distance in the vehicle and informing the driver of the predicted travelable distance; Equipped with energy management systems are known. (For example, refer to Patent Document 1).

JP 2007-312581 A

  In the invention described in Patent Document 1, it is possible to accurately grasp past power consumption history and travel history using a fuel consumption map and a frequency map, and predict the distance that can be traveled with the current remaining power with high accuracy. be able to. However, the present invention has a problem that it cannot be easily configured because of the large number of data.

  Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and a travelable distance calculation device that can easily and accurately predict a travelable distance reflecting the current travel state. And a vehicle using the same.

  The travelable distance calculation device of the present invention is a travelable distance calculation device that calculates the travelable distance of a vehicle equipped with a secondary battery, and calculates the latest power consumption rate per unit travel distance. Means, updating a plurality of past power consumption rates recorded in the recording unit, and recording in the recording unit, a plurality of power consumption rates recorded in the recording unit, and the secondary battery A travelable distance calculating unit that calculates a travelable distance from the remaining battery level, and the power consumption rate updating unit, when a predetermined condition is satisfied, a plurality of recorded in the recording unit All past power consumption rates are updated to a predetermined default power consumption rate, and in other cases, the power consumption rate calculation means among a plurality of past power consumption rates recorded in the recording unit Latest power calculated by The cost ratio greater historical rate of power consumption of the most deviation and updates to the most recent power consumption rate.

  In the travelable distance calculating device according to the present invention, the power consumption rate update unit is configured to set a plurality of past power consumption rates recorded in the recording unit, when a predetermined condition is satisfied. By updating to the default power consumption rate, when the predetermined condition is satisfied, it is possible to accurately calculate the future travelable distance regardless of the current travel state. In other cases, that is, when a predetermined condition is not satisfied, the latest power calculated by the power consumption rate calculating means among the plurality of past power consumption rates recorded in the recording unit. By updating the past power consumption rate that has the largest deviation from the consumption rate to the latest power consumption rate, it is possible to delete a past power consumption rate that is significantly different from the current vehicle running state, It is possible to calculate the travelable distance reflecting the traveling state of the vehicle.

  Detection means for detecting a battery state of the secondary battery is further provided, and the predetermined condition is a case where a full charge determination signal indicating that the secondary battery is in a fully charged state is input from the detection means. It is preferable. By updating to the default power consumption rate at the time of full charge, for example, the travelable distance can be displayed to the driver at the time of full charge regardless of the current driving state.

  Preferably, the predetermined condition further includes that a cancel signal for canceling the update to the default power consumption rate is not input to the power consumption rate update unit. For example, if the driver does not want to update to the default power consumption rate, the driver can input a cancel signal, so that he / she wants to keep a running record even after charging such as during long distance driving. In this case, it is possible not to update the default power consumption rate by inputting a cancel signal.

  The vehicle of the present invention includes any one of the travelable distance calculation devices described above and a notification unit that notifies the driver of the calculated travelable distance. By providing the notification means, it is possible to notify the driver of the travelable distance that is accurately calculated by reflecting the current travel state.

  According to the travelable distance calculating device of the present invention, it is possible to achieve an excellent effect that it can be simply configured and can accurately predict the distance that can be traveled in the future.

It is a block diagram for demonstrating the travelable distance calculation apparatus of this embodiment. It is a block diagram for demonstrating the power consumption rate update means of this embodiment. It is a flowchart for demonstrating the travelable distance calculation apparatus of this embodiment. It is a flowchart for demonstrating the travelable distance calculation apparatus of this embodiment.

  A travelable distance calculation device for an electric vehicle equipped with the secondary battery of the present invention will be described with reference to FIGS.

  The vehicle I which is an electric vehicle includes a secondary battery V as a driving battery. The secondary battery V is formed by connecting a plurality of lithium ion batteries (battery cells) in series. The vehicle I also includes an ECU 1 that performs various controls in the vehicle I. The ECU 1 is also connected to the secondary battery V, and controls the charger system and the like of the secondary battery V.

  The ECU 1 is provided with a travelable distance calculating device 2 according to this embodiment. The travelable distance calculation device 2 calculates the travelable distance of the vehicle I by multiplying the remaining battery level of the secondary battery V and the average of the power consumption rate indicating the power consumption per unit travel distance during travel. It is for calculating.

  Hereinafter, the configuration of the travelable distance calculating device 2 will be described in detail.

  The travelable distance calculation device 2 includes a power consumption rate calculation unit 3 that calculates the latest power consumption rate per unit travel distance, and updates a plurality of recorded past power consumption rates to a predetermined power consumption rate and records the recorded power. A consumption rate update unit 4 and a travelable distance calculation unit 5 that calculates an average power consumption rate that is an average of the recorded power consumption rates and calculates a travelable distance from the average power consumption rate.

  A power state determination unit 21 is connected to the travelable distance calculation device 2. The power supply state determination unit 21 determines whether the power supply of the vehicle I has been turned on from the off state, that is, whether the ignition switch has been turned on. Then, when the power state determination unit 21 changes from the off state to the on state, the power state determination unit 21 inputs a power signal indicating that the state has changed from the off state to the on state to the power consumption rate update unit 4. Further, when the power supply is in the on state, a power supply signal indicating that the power supply is not turned off is input to the determination unit 22 described later. Note that the travelable distance calculation device 2 does not operate when the power is off.

  The travelable distance calculation device 2 is connected to a determination unit 22 that determines whether to calculate the travelable distance. The determination unit 22 inputs an instruction signal for calculating a travelable distance to the travelable distance calculation device 2 when traveling a unit travel distance. The travelable distance calculation device 2 calculates the travelable distance in response to the instruction signal.

  The power consumption rate calculation means 3 includes a power consumption calculation unit 31 that calculates the latest power consumption of the secondary battery V, and a power consumption rate calculation unit 32 that calculates the latest power consumption rate from the latest travel distance and the latest power consumption. With.

  The power consumption calculation unit 31 uses the current value detected from the current sensor S01 provided in the secondary battery V and the voltage value detected from the voltage sensor S02 provided in the secondary battery V while traveling a unit travel distance. Is calculated as the latest power consumption. The calculated latest power consumption amount is input to the power consumption rate calculation unit 32.

  The power consumption rate calculation unit 32 calculates the current latest power consumption rate by dividing the unit travel distance by the latest power consumption calculated by the power consumption calculation unit 31. The unit travel distance is calculated from the travel distance detected by the travel distance detector 33 provided in the vehicle I. Here, the power consumption rate means a travel distance per 1 kWh of power consumption, and its unit is [km / kWh]. The calculated latest power consumption rate is input to the power consumption rate update unit 4.

  As described above, the power consumption rate update unit 4 updates the past power consumption rate to a predetermined power consumption rate, and includes a power consumption rate determination unit 41, a recording unit 42, and an updated power consumption rate determination unit 43. And a power consumption rate update unit 44 and a reset determination unit 45.

  The power consumption rate determination unit 41 determines whether or not the latest power consumption rate input from the power consumption rate calculation unit 32 is within a predetermined range, and when the latest power consumption rate is out of the predetermined range. Then, the value of the latest power consumption rate input from the power consumption rate update means 4 is rewritten to a predetermined value. This is because, in the present embodiment, the power consumption rate necessary for obtaining the travelable distance is obtained by dividing the unit travel distance by the latest power consumption. That is, when the vehicle continuously travels on a downhill, the power consumption is almost zero when the power consumed by traveling and the power obtained by regeneration are almost equal. As a result, the power consumption rate will diverge. Moreover, when the electric power obtained by regeneration exceeds the electric power consumed by traveling, the electric power consumption becomes a negative value, and the electric power consumption rate also becomes a negative value. Therefore, in this embodiment, as described above, a predetermined range of 0 to a predetermined value of the latest power consumption rate is defined, and when this latest power consumption rate exceeds the predetermined range, the power consumption rate calculation unit The latest power consumption rate input from 32 is rewritten to a predetermined value so that the latest power consumption rate does not become a very small value.

  In the recording unit 42, a plurality of past power consumption rates are recorded. Specifically, the past power consumption rate is recorded in the recording unit 42 one by one from address 1 to address n of the recording unit 42.

  The updated power consumption rate determination unit 43 calculates the past power consumption rate having the largest deviation from the latest power consumption rate calculated by the power consumption rate calculation unit 3 among the plurality of past power consumption rates recorded in the recording unit 42. Determine the updated power consumption rate. Specifically, the updated power consumption rate determination unit 43 calculates the absolute value of the difference between each past power consumption rate from address 1 to address n recorded in the recording unit 42 and the latest power consumption rate. . Then, it is determined to replace the past power consumption rate of the address m (1 ≦ m ≦ n) having the largest absolute value of the difference with the latest power consumption rate. Since there may be a plurality of past power consumption rates with the largest absolute value, in this case, the updated power consumption rate determination unit 43 may determine the update power consumption rate with the largest number of addresses.

  After the update power consumption rate determination unit 43 determines the update power consumption rate, the update power consumption rate determination unit 43 determines the update power consumption rate for each past power consumption rate recorded in the recording unit 42. An update permission signal is input to the power consumption rate update unit 44, and an update prohibition signal is input to the power consumption rate update unit 44 for those that are not determined as the update power consumption rate. Specifically, when the updated power consumption rate determination unit 43 determines to replace the m-th past power consumption rate with the latest power consumption rate, the updated power consumption rate determination unit 43 sets the mth address For the past power consumption rate, an update permission signal indicating that the update power consumption rate has been determined is input to the power consumption rate update unit 44. In addition, the updated power consumption rate determination unit 43 does not determine the update power consumption rate for the other n−1 past power consumption rates, and therefore inputs an update prohibition signal to the power consumption rate update unit 44.

  The power consumption rate update unit 44 updates the past power consumption rate recorded in the recording unit 42. In this case, the power consumption rate update unit 44 updates the past power consumption rate to which the update permission signal is input by the updated power consumption rate determination unit 43 to the latest power consumption rate. The past power consumption rate for which the update prohibition signal is input, that is, the past power consumption rate for which the update permission signal is not input is updated to the same past power consumption rate as before. Specifically, the power consumption rate update unit 44 confirms whether or not an update permission signal is input for each address from address 1 to address n. Then, the power consumption rate update unit 44 inputs the latest power consumption rate at the m-th address where the update permission signal is input, and the same value as before except for the other n−1 m-th addresses. Enter. In this way, all past power consumption rates are updated.

  By the way, according to the power consumption rate update means 4, the power consumption rate is always updated to reflect the latest driving state. Therefore, if the vehicle is charged after traveling on a rough road and the travelable distance is displayed on the display device 7 after full charge, the distance may be displayed shorter than the actual travelable distance. There is a need.

  Therefore, in this embodiment, the power consumption rate update unit 44 determines whether a predetermined condition for resetting the power consumption rate updated by the power consumption rate update unit 44 to the default power consumption rate is satisfied. A determination unit 45 is provided. When the reset determination unit 45 determines that the predetermined condition is satisfied, the reset determination unit 45 inputs a reset permission signal to the power consumption rate update unit 44. When the reset permission signal is input, the power consumption rate update unit 44 resets all the recorded power consumption rates to the default power consumption rate. In this embodiment, with this configuration, after full charge, the past power consumption rate indicating the past driving state remains in the recording unit 42, so that the travelable distance is displayed shorter than the distance that can actually travel. Is suppressed. Hereinafter, the reset determination unit 45 will be described in detail.

  The reset determination unit 45 operates when a power signal indicating that the power state is changed from the off state to the on state is input from the power state determination unit 21 when the power source is turned on. In the present embodiment, the “predetermined condition for resetting the power consumption rate updated by the power consumption rate updating unit 44 to the default power consumption rate” in the reset determination unit 45 is a full charge determination signal input and canceling. The signal is not input. The full charge determination signal is input by the battery remaining amount calculation means 6. The battery remaining amount calculating means 6 is provided in the ECU and connected to the secondary battery V, and calculates the remaining amount of electricity of the secondary battery V. The battery remaining amount calculating means 6 measures the SOC (state of charge) state of the secondary battery V used in the calculation of the remaining electric power, measures the voltage of the battery from a battery voltage measuring means (not shown), and sets the measured voltage value. Detection based on (detection means). The state where the SOC state becomes 100% by charging is when the battery is fully charged. When the detected SOC state is 100%, the remaining battery level calculation means 6 inputs a full charge determination signal to the reset determination unit 45 assuming that the battery is fully charged.

  The cancel signal in the reset determination unit 45 is a signal for canceling the reset input by the driver of the vehicle I when the driver of the vehicle does not want to reset. As the cancel signal input means, for example, a menu screen displayed on the display device 7 provided in the vehicle I displays an option indicating cancellation of reset, and the driver selects this option, so that the reset determination is performed. Input to the unit 45.

  When the power supply state changes from the off state to the on state, when the reset determining unit 45 determines that the predetermined condition is satisfied, that is, when the battery is fully charged and no cancel signal is input. The reset determination unit 45 inputs a reset permission signal to the power consumption rate update unit 44. The power consumption rate update unit 44 resets all recorded past power consumption rates to the default power consumption rate in response to the reset permission signal. When the reset determining unit 45 determines that the predetermined condition is not satisfied, the reset determining unit 45 inputs a reset prohibition signal to the travelable distance calculating unit 5. That is, when the power state changes from the off state to the on state, the reset determination unit 45 operates, and the operated reset determination unit 45 determines whether to perform a reset. Then, the reset determination unit 45 sends a signal according to this result.

  Thus, the power consumption rate update unit 44 updates the past power consumption rate recorded in the recording unit 42 to either the default power consumption rate, the same past power consumption rate, or the latest power consumption rate, When all the updates are completed, these values are input to the recording unit 42. In the recording unit 42, these values are newly recorded as past power consumption rates. When the recording in the recording unit 42 is completed, the power consumption rate updating unit 44 sends an end signal indicating that the recording is completed to the travelable distance calculating unit 5.

  The travelable distance calculation means 5 is recorded in the recording unit 42 from the recording unit 42 when an end signal is input from the power consumption rate updating unit 44 or a reset prohibition signal is input from the reset determination unit 45. A plurality of past power consumption rates are acquired, and an average power consumption rate that is the average of these is calculated. The travelable distance calculating means 5 is connected to a battery remaining amount calculating means 6 provided in the ECU. The remaining battery level calculation means 6 calculates the remaining battery level and inputs it to the travelable distance calculation means 5. Specifically, the battery remaining amount calculation means 6 calculates the remaining battery amount by multiplying the initial battery capacity by the detected SOC state. The travelable distance calculation means 5 calculates the travelable distance by multiplying the average power consumption rate by this remaining battery level.

  The calculated travelable distance is displayed on the display device 7 provided in the vehicle I, and based on this, the driver can recognize how far the vehicle can travel without charging. .

  As described above, in the present embodiment, the average power consumption rate is calculated from the latest power consumption rate and the past power consumption rate, and thus the travelable distance is obtained. The reflected travelable distance can be calculated. In particular, among the past power consumption rates, the power consumption rate update means 4 updates the power consumption rate that has the largest difference from the current power consumption rate by replacing it with the current power consumption rate. Since the driving state different from the state can be excluded, the current driving state can be reflected by the possible driving distance. In addition, by using the average value of the power consumption rate recorded in the recording unit, the travelable distance is not changed suddenly every time the travelable distance is calculated. The possible distance can be trusted.

  In this embodiment, the average power consumption rate is calculated from the latest power consumption rate and the past power consumption rate of the vehicle from the mileage detection unit 33 ordinarily mounted on the vehicle and the battery remaining amount calculation means 6. Thus, the travelable distance is obtained. Therefore, it is not necessary to newly install a special device in the vehicle, and the cost can be suppressed.

  Further, in the present embodiment, when the power source is switched from the off state to the on state, that is, when the ignition switch is turned on, the reset determination unit 45 determines whether or not a predetermined condition is satisfied, When the condition is satisfied, the power consumption rate is updated to the default power consumption rate. In this way, by updating to the default power consumption rate at full charge when no cancel signal is input, it is possible to accurately calculate and display how far you can run regardless of past driving conditions, The driver can be made aware. Furthermore, when a cancel signal is input, the power consumption rate is not reset. Therefore, it is also useful when resetting is not desired, such as when it is desired to reflect the driving state of the driver before charging after charging, such as during charging during long-distance movement.

  A method of calculating the travelable distance according to this embodiment will be described with reference to the flowcharts shown in FIGS. 3 and 4. This flowchart shows the flow of one process in FIGS.

  In step S1, the power supply state determination unit 21 determines whether the power supply of the vehicle I has changed from the off state to the on state, that is, whether the ignition switch has been turned on. When the power supply of the vehicle I changes from the off state to the on state (Y), the process proceeds to step S2. If the vehicle I is powered on (N), the process proceeds to step S10.

  In step S <b> 2, the reset determination unit 45 determines whether or not the secondary battery V is in a fully charged state, that is, whether or not the full charge determination signal detected from the battery remaining amount calculation unit 6 is input. If the battery is fully charged (Y), the process proceeds to step S3. If it is not fully charged (N), a reset prohibition signal is output and the process proceeds to step S7.

  In step S3, the reset determining unit 45 determines whether a cancel signal is input. If no cancel signal is input (N), the process proceeds to step S4. If a cancel signal is input (Y), a reset prohibition signal is output, and the process proceeds to step S7.

  In step S4, since the battery is fully charged and no cancel signal is input, the reset determination unit 45 determines that a predetermined condition is satisfied, and inputs a reset permission signal to the power consumption rate update unit 44. To do. Proceed to step S5.

  In step S5, the power consumption rate update unit 44 updates the past power consumption rate to the default power consumption rate when the reset permission signal is input. Proceed to step S6.

  In step S <b> 6, the power consumption rate update unit 44 records all updated power consumption rates (in this case, all default power consumption rates) in the recording unit 42. The power consumption rate updating unit 44 inputs an end signal to the travelable distance calculating unit 5. Proceed to step S7.

  In step S7, the travelable distance calculation means 5 acquires the power consumption rate recorded in the recording unit 42 when the end signal is input or the reset prohibition signal is input, and the average power consumption rate is obtained. The average power consumption rate is calculated. Proceed to step S8.

  In step S8, the travelable distance calculation means 5 calculates the travelable distance by multiplying the calculated average power consumption rate and the remaining battery level. The calculated travelable distance is input to the display device 7. Proceed to step S9.

  In step S9, the display device 7 displays the travelable distance on the display screen. As a result, the driver can accurately grasp the travelable distance of the vehicle I.

  In other words, when the vehicle power source is switched from the off state to the on state, the driver performs a reset if the predetermined condition is satisfied, so that how much the vehicle is fully charged regardless of the past driving state. Whether or not the vehicle can run can be displayed. In principle, when the secondary battery V is fully charged, the current driving state is reset so that the driver can accurately recognize the travelable distance when fully charged. For example, if the driving state is not reset unless reset is set in advance, the driver cannot recognize an accurate driving distance when using a normal vehicle. Therefore, it is preferable to configure as in the present embodiment. In addition, when the predetermined condition is not satisfied by inputting the cancel signal, the travelable distance can be displayed based on the past travel state before the power is turned off. If the same running state as the running state is continued, it can be displayed how much the vehicle can run.

  Next, steps S10 and after, that is, a case where the vehicle I is powered on will be described.

  In step S <b> 10, it is determined whether or not it is time for the determination unit 22 to start the travelable distance calculation process. If the determination unit 22 has sent an instruction signal to start the travelable distance calculation process (Y), the process proceeds to step S11. When the determination unit 22 does not send an instruction signal for starting the travelable distance calculation process (for example, when the vehicle does not travel a predetermined distance) (N), the determination unit 22 stays in step S10 and the travelable distance of the determination unit 22 It waits for an instruction signal to start the calculation process.

  In step S11, the power consumption calculation unit 31 calculates the latest power consumption per unit travel distance based on the outputs from the current sensor S01 and the voltage sensor S02 provided in the secondary battery V, and the power consumption rate calculation unit This latest power consumption is input to 32. Proceed to step S12.

  In step S <b> 12, the power consumption rate calculation unit 32 calculates the latest power consumption rate based on the latest power consumption from the power consumption calculation unit 31 and inputs the latest power consumption rate to the power consumption rate determination unit 41 of the power consumption rate update unit 4. To do. Proceed to step S13.

  In step S <b> 13, the power consumption rate determination unit 41 determines whether or not the latest power consumption rate input to the power consumption rate determination unit 41 is within a predetermined range. If the latest power consumption rate is outside the predetermined range (N), the process proceeds to step S14. If the latest power consumption rate is within the predetermined range (Y), the process proceeds to step S15.

  In step S14, the latest power consumption rate is rewritten to a predetermined value by the power consumption rate determination unit 41. Thereafter, the process proceeds to step S15.

  In step S <b> 15, the updated power consumption rate determination unit 43 acquires the latest power consumption rate that has passed through the power consumption rate determination unit 41. Proceed to step S16.

  In step S <b> 16, the updated power consumption rate determination unit 43 acquires a plurality of recorded past power consumption rates from the recording unit 42. Proceed to step S17.

  In step S17, the updated power consumption rate determination unit 43 calculates the absolute value of the difference between the acquired latest power consumption rate and the past power consumption rate, and sets the past power consumption rate having the largest value as the latest power consumption rate. The update power consumption rate to be updated is determined. For example, the absolute value of the difference between all the past power consumption rates from the first address to the nth address and the latest power consumption rate is calculated, and the past power consumption rate of the mth address having the largest absolute value is calculated as the latest power consumption rate. The update power consumption rate to be updated to the consumption rate is determined. Proceed to step S18.

  In step S18, the update power consumption rate determination unit 43 updates the past power consumption rate determined as the update power consumption rate among the past power consumption rates recorded in the recording unit 42 after the update power consumption rate is determined. An update prohibition signal is input to the power consumption rate update unit 44 for the permission signal and for other past power consumption rates. In the above example, the updated power consumption rate determination unit 43 receives an update permission signal for the past power consumption rate at the m-th address, and an update prohibition signal for the other past power consumption rates. Enter. Proceed to step S19.

  In step S19, the power consumption rate update unit 44 confirms whether or not there is an update permission signal. In the above example, it is determined whether an update permission signal is input for each past power consumption rate recorded in the recording unit 42. In the case of the m-th past power consumption rate to which the update permission signal is input (Y), the process proceeds to step S20. In the case of other past power consumption rates for which no update permission signal has been input (N), the process proceeds to step S21.

  In step S20, the power consumption rate update unit 44 updates the past power consumption rate to the latest power consumption rate. Proceed to step S22.

  In step S21, the power consumption rate update unit 44 updates the past power consumption rate to the same past power consumption rate. Proceed to step S22.

  In step S22, the power consumption rate update unit 44 determines whether or not all past power consumption rates have been updated. If all the past power consumption rates have been updated (Y), the process proceeds to step S5. If all past power consumption rates have not been updated (N), the process returns to step S19. Specifically, when the past power consumption rate at the first address is updated in step S22, the process returns to step S19 to update the past power consumption rate at the second address. If this process is repeated and all the past power consumption rates up to the n-th address are updated, it is determined in step S22 that the update is completed (Y), and the process proceeds to step S6.

  Thereafter, steps S6 to S9 described above are executed. That is, in step S6, the power consumption rate update unit 44 records all the updated power consumption rates (in this case, the past power consumption rate or the latest power consumption rate) in the recording unit 42. Proceed to step S7.

  In step S7, the travelable distance calculating unit 5 acquires the power consumption rate recorded in the recording unit 42, and calculates an average power consumption rate that is an average of the power consumption rates. Proceed to step S8.

  In step S8, the travelable distance calculation means 5 calculates the travelable distance by multiplying the calculated average power consumption rate and the remaining battery level. The calculated travelable distance is input to the display device 7. Proceed to step S9.

  In step S9, the display device 7 displays the travelable distance on the display screen. As a result, the driver can accurately grasp the travelable distance of the vehicle I based on the current travel state.

  When the vehicle continues to travel, an instruction signal for calculating the travelable distance is input from the determination unit 22 to the travelable distance calculation device 2, and the latest power consumption rate at that time is calculated. Then, the same calculation process is repeated with the power consumption rate currently recorded in the recording unit 42 as the past power consumption rate. Thereafter, the driver can recognize the remaining travelable distance and, if necessary, can continue traveling smoothly by charging. Therefore, according to the present embodiment, while traveling, the past power consumption rate indicating the travel state farthest from the current travel state is updated to the latest power consumption rate, so that the current travel state can be more traveled. Can be reflected. Therefore, the travelable distance is accurate.

  Thus, in the present embodiment, it is possible to accurately calculate and display the travelable distance reflecting the current travel state with a simple configuration. In addition, the reset determination unit 45 determines the execution of the reset, and resets the past power consumption rate recorded in the recording unit 42 to the default power consumption rate in a predetermined case, regardless of the past driving state. In addition, it is possible to display to the driver how much the vehicle can travel. Furthermore, since the reset can be canceled, it is possible to prevent the reset from the default power consumption rate when it is desired to save the past power consumption rate indicating the past traveling state, such as during long-distance driving.

  The present invention is not limited to the embodiment described above. For example, in the above-described embodiment, the past power consumption rate recorded in the recording unit 42 is reset at the time of full charge, but the time of reset is not limited to such full charge. For example, the reset unit may be separately configured to immediately update the past power consumption rate to the default value when the end of charging of the secondary battery V is detected in a fully charged state.

  In the present embodiment, the travelable distance calculating device is configured as shown in the block diagrams of FIGS. 1 and 2, but the present invention is not limited to this. For example, a reset determination unit 45 connected to the battery remaining amount calculation unit 6 and the recording unit 42 is provided, and when the full charge determination signal is input to the reset determination unit 45 and the reset determination unit 45 determines reset, the power consumption rate update unit Instead of 4, the past power consumption rate recorded in the recording unit 42 may be replaced with the default power consumption rate.

  Further, it is not always necessary to calculate the travelable distance in the same procedure as the flowcharts shown in FIGS. For example, in the present embodiment, the reset determination unit 45 determines execution of the reset immediately after the power source is switched from the off state to the on state, but the reset determination unit 45 determines the execution of the reset immediately after the vehicle starts running. In a predetermined case, the past power consumption rate directly recorded in the recording unit 42 may be replaced with the default power consumption rate.

  As the notification unit, the display device 7 has been described as an example in the present embodiment, but is not limited thereto. For example, it is possible to notify the driver by voice.

  In the present embodiment, an electric vehicle has been described as an example of a vehicle, but the vehicle is not limited to this and may be a so-called hybrid vehicle.

  The travelable distance calculation device of the present invention can accurately calculate the travelable distance of the vehicle. Therefore, it can be used in the vehicle manufacturing field.

2 Travelable distance calculation device 3 Power consumption rate calculation means 4 Power consumption rate update means 5 Travelable distance calculation means 6 Battery remaining amount calculation means 7 Display device 21 Power supply state determination unit 22 Determination unit 31 Power consumption calculation unit 32 Power consumption Rate calculation unit 33 Travel distance detection unit 41 Power consumption rate determination unit 42 Recording unit 43 Update power consumption rate determination unit 44 Power consumption rate update unit 45 Reset determination unit

Claims (4)

A travelable distance calculation device for calculating a travelable distance of a vehicle equipped with a secondary battery,
Power consumption rate calculating means for calculating the latest power consumption rate per unit mileage;
A plurality of past power consumption rates recorded in the recording unit, and the power consumption rate update means for recording in the recording unit;
A travelable distance calculating means for calculating a travelable distance from a plurality of power consumption rates recorded in the recording unit and a remaining battery level of the secondary battery;
The power consumption rate update means updates a plurality of past power consumption rates recorded in the recording unit to a predetermined default power consumption rate when a predetermined condition is satisfied,
In other cases, the past power consumption rate having the largest deviation from the latest power consumption rate calculated by the power consumption rate calculating means among the plurality of past power consumption rates recorded in the recording unit. The travelable distance calculating device is characterized by updating to the latest power consumption rate. It further comprises detection means for detecting the battery state of the secondary battery,
2. The travelable distance calculation device according to claim 1, wherein the predetermined condition is a case where a full charge determination signal indicating that the secondary battery is in a fully charged state is input from the detection unit. . 3. The predetermined condition further includes that a cancel signal for canceling updating to the default power consumption rate is not input to the power consumption rate update unit. The travelable distance calculation device described. A vehicle comprising: the travelable distance calculating device according to any one of claims 1 to 3; and a notification unit that notifies the driver of the calculated travelable distance.

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