JP7234582B2 - Movable distance calculator - Google Patents

Description

The present invention relates to a device for calculating a movable distance of a mobile object using power supplied from a battery.

Conventionally, a first power consumption (mileage per unit electric energy) when the vehicle travels a first reference distance and a second power consumption when the vehicle travels a second reference distance longer than the first reference distance are calculated. There is a device for calculating (see Patent Document 1). In the device described in Patent Document 1, when the charging of the battery is completed, the travelable distance is calculated based on the second power consumption. 1 The travelable distance is calculated based on the electricity consumption.

Japanese Patent No. 5729191

By the way, the inventors of the present application found that the electric power consumption (travel distance per unit electric energy) changes not only depending on the running (moving) state of the vehicle (moving body), but also depending on the remaining amount of the battery. rice field.

The present invention has been made in view of such circumstances, and its main purpose is to improve the accuracy of calculating the movable distance in a movable distance calculation device, taking into account that the electric power consumption changes depending on the remaining battery capacity. It is to let

The first means for solving the above problems is
A movable distance calculation device (30) for calculating a movable distance of a moving object (10) using power supplied from a battery (21),
a remaining amount calculator (31) for calculating the current remaining amount of the battery;
An electricity consumption estimating unit ( 32, 132) and
Based on the current remaining amount calculated by the remaining amount calculating section and the electricity consumption estimated by the electricity consumption estimating section, a movable distance, which is a distance that the moving body can move, is calculated based on the current remaining amount. a possible distance calculator (33);
Prepare.

According to the above configuration, the moving object moves using power supplied from the battery. Then, the movable distance of the moving object is calculated. As the mobile object, an automobile, a ship, an aircraft, or the like can be used. The battery may be a secondary battery or a primary battery.

Here, the remaining amount calculation unit calculates the current remaining amount, which is the current remaining amount of the battery. The electricity consumption estimating unit estimates the electricity consumption, which is the moving distance per unit electric energy, from the current remaining amount calculated by the remaining amount calculating unit to 0 so as to change with a predetermined tendency with respect to the remaining amount of the battery. Therefore, it is possible to change the estimated power consumption with a predetermined tendency with respect to the remaining battery capacity, and improve the accuracy of estimating the power consumption compared to the case where the change in the power consumption due to the remaining battery capacity is not taken into consideration. be able to. Note that the predetermined tendency can be obtained based on a preset relationship between the remaining battery power and the electricity consumption, or the change tendency of the electricity consumption with respect to the remaining battery power up to the current remaining battery power.

Then, the possible distance calculation unit calculates a movable distance, which is a distance that the mobile body can move, based on the current remaining amount calculated by the remaining amount calculating unit and the electricity consumption estimated by the electricity consumption estimating unit. calculate. Therefore, it is possible to improve the calculation accuracy of the movable distance in consideration of the fact that the power consumption changes depending on the remaining amount of the battery.

In the second means, the moving body includes a motor (22) that generates driving force for moving the moving body using power supplied from the battery,
The electricity cost estimation unit (32)
a power amount calculation unit (32b) that calculates power consumption of the motor while the moving object moves a predetermined distance;
estimating a power loss caused by the generation of the driving force by the motor from the current remaining amount calculated by the remaining amount calculating unit to 0 so as to change with a first tendency with respect to the remaining amount of the battery; , a loss amount estimating unit (32a) for estimating the power loss amount while the moving body moves a predetermined distance based on the power loss,
estimating an average value of the power consumption based on the predetermined distance, the power consumption calculated by the power calculation unit, and the power loss amount estimated by the loss amount estimation unit;
The possible distance calculating unit calculates the movable distance based on the current remaining amount calculated by the remaining amount calculating unit and the average value of the electricity consumption estimated by the electricity consumption estimating unit.

According to the above configuration, the moving body includes a motor that uses power supplied from the battery to generate driving force for moving the moving body. Here, the inventors of the present application have found that the power consumption of the motor does not change depending on the remaining battery power, but the power loss caused by the generation of driving force by the motor changes depending on the remaining battery power.

In this regard, the loss amount estimating unit changes the power loss caused by the generation of the driving force by the motor from the current remaining amount calculated by the remaining amount calculating unit to 0 with the first tendency with respect to the remaining amount of the battery. Then, based on this power loss, the amount of power loss while the moving object moves a predetermined distance is estimated. Therefore, it is possible to improve the accuracy of estimating the amount of power loss by considering that the power loss caused by the generation of the driving force by the motor changes depending on the remaining amount of the battery. Note that the first tendency can be acquired based on a preset relationship between the remaining battery level and power loss.

Then, the power consumption estimation unit calculates the power consumption amount of the motor while the moving body moves the predetermined distance calculated by the power amount calculation unit, and the power loss amount estimated by the loss amount estimation unit. Based on this, the average electricity cost is estimated. For this reason, it is possible to improve the accuracy of estimating the average value of electricity consumption, taking into account that the power loss varies depending on the remaining battery capacity. Then, the possible distance calculation unit calculates the possible travel distance based on the current remaining amount calculated by the remaining amount calculation unit and the average value of the electricity consumption estimated by the electricity consumption estimation unit. Therefore, it is possible to improve the calculation accuracy of the movable distance.

Specifically, in the third means, the loss amount estimating unit, based on a preset relationship between the rotational speed of the motor, the torque generated by the motor, the power loss, and the remaining amount of the battery, From the current remaining amount calculated by the remaining amount calculating unit to 0, the power loss is estimated to change with the first tendency with respect to the remaining amount of the battery.

According to the above configuration, the power loss can be changed according to the rotation speed of the motor and the generated torque of the motor, and the power loss can be accurately estimated according to the drive state of the motor. The preset relationship may be a plurality of three-dimensional maps in which the relationship between the rotational speed of the motor, the torque generated by the motor, and the power loss is preset according to the remaining amount of the battery. A four-dimensional map in which the relationship between the torque generated by the motor, the power loss, and the remaining battery capacity is set in advance may be used.

In the fourth means, the electricity cost estimating unit (132) includes an electricity cost calculating unit (132b) that calculates the electricity cost each time the remaining amount of the battery decreases by a predetermined amount. A second trend, which is a trend of change in the electricity consumption, is estimated based on a plurality of the electricity consumptions, and the electricity consumption is changed from the current remaining amount calculated by the remaining amount calculation unit to 0 with respect to the remaining amount of the battery. It is estimated to change with the second trend.

According to the above configuration, the electricity consumption calculation unit calculates the electricity consumption each time the remaining battery level decreases by a predetermined amount. Therefore, compared to the case where the power consumption is calculated each time the moving body moves a predetermined distance, it becomes easier to grasp the change in the power consumption with respect to the decrease in the remaining amount of the battery. Then, the electricity cost estimating unit estimates a second trend, which is a change tendency of the electricity cost, based on the plurality of electricity costs calculated by the electricity cost calculating unit, and estimates the electricity cost from the current remaining amount calculated by the remaining amount calculating unit to 0. Estimation is made so as to change the remaining amount of the battery according to the second tendency. Therefore, even if it is difficult to set in advance the trend of change in electricity consumption with respect to the remaining battery capacity, it is possible to accurately estimate the electricity consumption based on the actual trend of change in electricity consumption with respect to the remaining battery capacity. can.

When the moving state of the moving body fluctuates greatly, the electricity consumption calculated increases or decreases significantly each time the remaining battery level decreases by a predetermined amount. In this case, there is a possibility that the accuracy of estimating the trend of change in the electricity consumption based on the plurality of electricity consumptions calculated by the electricity consumption calculation unit may be degraded.

In this regard, in the fifth means, the electricity consumption calculation unit calculates the electricity consumption each time the remaining amount of the battery decreases by a predetermined amount on condition that the moving body is in a steady moving state. For this reason, the power consumption calculation unit calculates the power consumption each time the remaining amount of the battery decreases by a predetermined amount when the mobile body is in a steady state of movement, and calculates the power consumption when the mobile body is not in a steady state of movement. Electricity consumption is not calculated even if it decreases by a fixed amount. Therefore, it is possible to suppress a large increase or decrease in the calculated electricity consumption, and it is possible to suppress a decrease in the accuracy of estimating the change tendency of the electricity consumption.

In a sixth means,
The moving body includes a motor that generates driving force for moving the moving body using power supplied from the battery,
The electricity cost estimating unit
a power amount calculation unit that calculates power consumption of the motor while the moving object moves a predetermined distance;
estimating a power loss caused by the generation of the driving force by the motor from the current remaining amount calculated by the remaining amount calculating unit to 0 so as to change with a first tendency with respect to the remaining amount of the battery; , a loss amount estimating unit that estimates the amount of power loss while the moving object moves a predetermined distance based on the power loss,
A first electricity consumption estimating unit for estimating an average value of the electricity consumption based on the predetermined distance, the electricity consumption calculated by the electricity amount calculating unit, and the electricity loss amount estimated by the loss amount estimating unit. (32) and
an electricity consumption calculation unit that calculates the electricity consumption each time the remaining amount of the battery decreases by a predetermined amount;
A second trend, which is a change tendency of the electricity consumption, is estimated based on the plurality of electricity consumptions calculated by the electricity consumption calculation unit, and the electricity consumption is reduced from the current remaining amount calculated by the remaining amount calculation unit to 0. a second electricity consumption estimating unit (132) for estimating the remaining amount of the battery so as to change according to the second tendency;
The possible distance calculation unit calculates the current remaining capacity calculated by the remaining capacity calculation unit and calculating the movable distance based on the average value of the electricity consumption; The movable distance is calculated based on the amount and the electricity consumption estimated by the second electricity consumption estimation unit.

According to the above configuration, the electricity cost estimator includes the first electricity cost estimator that is the electricity cost estimator of the second means and the second electricity cost estimator that is the electricity cost estimator of the fourth means. Then, when the amount of variation in the state of movement of the moving object is greater than the predetermined amount of variation, the possible distance calculating unit calculates the possible distance of movement in the same manner as in the second means, and the amount of variation in the state of movement of the moving object If it is smaller than the amount, the movable distance is calculated in the same manner as in the fourth means. Therefore, it is possible to have both the advantage of the second means and the advantage of the fourth means.

1 is a block diagram of a vehicle according to a first embodiment; FIG. 4 is a graph showing the relationship between SOC and electricity consumption; 4 is a flowchart showing a procedure for calculating a travelable distance according to the first embodiment; A map showing the relationship between rotational speed, torque, and loss according to SOC. A graph showing the relationship between SOC, power, and power loss. The block diagram of the vehicle of 2nd Embodiment. 9 is a flow chart showing a procedure for calculating a travelable distance according to the second embodiment; 4 is a graph showing a change trend of electricity consumption with respect to SOC;

(First embodiment)
A first embodiment embodied in an electric vehicle ECU (hereinafter referred to as "EV-ECU") mounted on an electric vehicle will be described below with reference to the drawings.

As shown in FIG. 1 , the vehicle 10 is an electric vehicle that runs by operating a running motor 22 (rotary electric machine) with electric power from a running battery 21 . Vehicle 10 includes a plurality of electronic control units that are connected to each other via communication lines or the like.

The vehicle 10 includes an EV-ECU 30 (Electric Vehicle Electronic Control Unit), a BMU 23 (Battery Management Unit, battery management ECU), and an MCU 24 (Motor Control Unit, motor control ECU) as electronic control units. These electronic control units are composed of a well-known microcomputer or the like having a CPU, ROM, RAM, input/output interface, and the like.

The BMU 23 is an electronic control unit that manages the running battery 21 of the vehicle 10 . The battery 21 is a main power source for a running motor 22 (motor) connected to the drive wheels of the vehicle 10, and is configured by connecting a plurality of lithium ion battery modules in series, for example. Electric power supplied from the battery 21 is supplied to the motor 22 via the inverter 25 . The BMU 23 controls the operation of the inverter 25 to adjust the power supplied from the battery 21 to the motor 22 and at the same time calculate the state of charge (SOC) of the battery 21 .

The MCU 24 is an electronic control device that controls the torque and rotation speed output from the motor 22 according to the running state and driving operation of the vehicle 10 . A drive wheel (not shown) of the vehicle 10 rotates at an angular velocity corresponding to the rotation speed of the motor 22 . The MCU 24 sequentially calculates the travel speed and travel distance of the vehicle 10 from the rotational speed of the motor 22 .

The EV-ECU 30 (movable distance calculation device) is an electronic control device higher than other electronic control devices, and controls the BMU 23 and MCU 24 in an integrated manner. For example, the EV-ECU 30 monitors the timing and amount of control performed by other electronic control devices, and intervenes in each control as necessary. Also, the EV-ECU 30 is connected to a display device 26 built in the instrument panel.

In addition, the EV-ECU 30 of the present embodiment is based on information detected by another electronic control device, and is the current remaining amount of the running battery 21. A possible distance Dp is calculated. The travelable distance Dp calculated here is displayed on the display device 26 at any time.

The BMU 23, MCU 24, and EV-ECU 30 will be further described.

The BMU 23 has an SOC calculator 23a. The SOC calculator 23a detects or calculates the SOC [%] of the running battery 21 using a known estimation method. For example, after the battery 21 is fully charged, the amount of discharge is integrated based on the current value and voltage value when the battery is discharged. Also, the amount of charge is integrated based on the current value and voltage value during battery charging (regenerative charging). Then, SOC is calculated as a ratio of the current charge capacity to the charge capacity of full charge according to the discharged charge amount and the charge capacity of full charge. Also, the internal resistance value of the battery 21, the open circuit voltage (OCV: Open Circuit Voltage), the battery temperature, etc. may be detected, and the SOC may be calculated based on these. In this way, the SOC information detected or calculated by the BMU 23 is sent to the EV-ECU 30 .

MCU24 has the travel distance calculation part 24a and the motor electric power calculation part 24b.

The travel distance calculation unit 24 a calculates the travel distance [km] actually traveled by the vehicle 10 from the rotation speed of the motor 22 . The traveling distance calculation unit 24a sequentially accumulates the traveling distance, and outputs the accumulated traveling distance value to the EV-ECU 30 at predetermined intervals (for example, several tens of milliseconds). In this case, the traveled distance value may be the traveled distance integrated value (integrated traveled distance) from the beginning of the new vehicle, or may be a value reset to 0 when the initialization signal is received.

Further, the motor power calculation unit 24b calculates the motor power consumption PM [kW], which is the power consumed by the motor 22, in a predetermined period (for example, several tens of ms). The calculated motor power consumption PM is output to the EV-ECU 30 at predetermined intervals (for example, several tens of milliseconds).

The EV-ECU 30 has a remaining battery capacity calculator 31 , an electricity consumption estimator 32 , and a travelable distance calculator 33 .

The remaining battery level calculation section 31 (remaining capacity calculation section) detects or calculates the current remaining capacity EB [kWh] of the running battery 21 . Here, for example, the SOC is multiplied by the total capacity (fully charged capacity) TEB of the battery 21 to calculate the current remaining capacity EB (=TEB×SOC). Alternatively, the internal resistance value of the battery 21, the open circuit voltage, the battery temperature, etc. may be detected, and the current remaining capacity EB may be calculated based on these. The current remaining amount EB calculated in this manner is output to the travelable distance calculation unit 33 .

The electricity consumption estimation unit 32 has a power consumption amount calculation unit 32b and a loss amount estimation unit 32a.

The power consumption calculation unit 32b (power consumption calculation unit) determines whether the vehicle 10 travels a predetermined distance Dc (for example, 10 km) based on the motor power consumption PM [kW] input from the motor power calculation unit 24b of the MCU 24. Calculate the motor power consumption EM [kWh] between The power consumption calculation unit 32b integrates (time integrates) the motor power consumption PM input from the motor power calculation unit 24b while the vehicle 10 travels the predetermined distance Dc, thereby calculating the motor power consumption EM [kWh ] is calculated. Further, the power consumption calculation unit 32b may calculate the motor power consumption EM [kWh] by multiplying the torque of the motor 22 and the rotation speed and performing time integration.

The loss amount estimating unit 32a (loss amount estimating unit) estimates the power loss amount EL [kWh] caused by the generation of the driving force by the motor 22 while the vehicle 10 travels the predetermined distance Dc. As shown in FIG. 4, the loss amount estimator 32a has a plurality of three-dimensional maps (maps) that define the relationship between the rotational speed, torque, and power loss of the motor 22 according to the SOC. These maps can be set in advance based on experiments or the like. The torque (generated torque) may be a detected torque value of the motor 22 or a torque command value. Power loss includes power loss occurring in the inverter 25 , the motor 22 , and the battery 21 as the motor 22 is driven. The details of the method of estimating the power loss amount EL will be described later.

Returning to FIG. 1 , the electricity consumption estimating unit 32 (electricity consumption estimating unit) estimates the average value ADE [km/kWh] of the electricity consumption from the current remaining amount EB to 0 calculated by the remaining battery amount calculating unit 31 . Electricity consumption DE [km/kWh] is the traveling distance (moving distance) of vehicle 10 per unit electric energy. The electricity cost estimating unit 32 calculates the average value of the electricity cost based on the predetermined distance Dc, the motor power consumption EM calculated by the power consumption calculating unit 32b, and the power loss amount EL estimated by the loss amount estimating unit 32a. Estimate ADE. Then, the estimated average value ADE of the electricity consumption is output from the electricity consumption estimation unit 32 to the travelable distance calculation unit 33 .

The travelable distance calculation unit 33 (possible distance calculation unit) estimates the travelable distance Dp from the average value ADE of the electricity consumption and the current remaining charge EB calculated by the remaining battery charge calculation unit 31 . The travelable distance calculation unit 33 multiplies the current remaining amount EB [kWh] by the average electricity consumption ADE [km/kWh] to estimate the travelable distance Dp [km] (Dp=EB×ADE).

Then, the signal of the travelable distance Dp calculated in this way is sent to the display device 26 and displayed on the display section of the display device 26 .

Here, the inventors of the present application have found that the electricity consumption varies not only depending on the running state of the vehicle 10 but also depending on the SOC (remaining amount) of the battery 21 .

FIG. 2 is a graph showing the relationship between SOC and electricity consumption. As shown in the figure, for example, when the vehicle 10 is in a steady running state (steady moving state) at a predetermined speed, the smaller the SOC, the higher (better) the electricity consumption. A possible reason for this is that as the SOC of battery 21 becomes smaller, the voltage of battery 21 becomes lower and the switching loss in inverter 25 decreases. In the simulations of the present inventors, it has been confirmed that when the supply voltage of the battery 21 is lowered, the power loss of the motor 22 and the power loss of the inverter 25 are reduced, and the power consumption is increased. In particular, the reduction in power loss in the inverter 25 has a great effect on the electricity consumption.

Conventionally, the current SOC is calculated using the average value of the electricity consumption from the electricity consumption DE1 (or DE2) when the SOC is x1 (or x2) [%] to the electricity consumption DE3 when the current SOC is x3 [%] The travelable distance from x3 [%] to 0 [%] is calculated. In this case, it is not possible to improve the calculation accuracy of the travelable distance Dp because the change in the electric power consumption due to the SOC is not considered.

Therefore, in the present embodiment, the electricity consumption estimator 32 estimates the electricity consumption so as to change from the current SOC (remaining amount EB) of the battery 21 to 0 with a predetermined tendency with respect to the SOC (remaining amount) of the battery 21. . More specifically, the loss amount estimating unit 32a changes the power loss PL [kW] caused by the generation of the driving force by the motor 22 from the current SOC to 0 [%] with the first tendency with respect to the SOC of the battery 21. and the amount of power loss EL while the vehicle 10 travels a predetermined distance Dc is estimated based on the power loss PL.

FIG. 3 is a flowchart showing the procedure for calculating the travelable distance according to this embodiment. This series of processes is repeatedly executed by the EV-ECU 30 at a predetermined cycle.

First, the motor power consumption PM [kW] is integrated to calculate the motor power consumption EM [kWh] (S10). Subsequently, it is determined whether or not the traveling distance of the vehicle 10 has reached a predetermined distance Dc (S11). Note that the initial value of the motor power consumption EM and the initial value of the travel distance are zero.

In the determination of S11, when it is determined that the traveling distance of the vehicle 10 has not reached the predetermined distance Dc (S11: NO), the process is executed again from S10. On the other hand, when it is determined that the traveling distance of the vehicle 10 has reached the predetermined distance Dc (S11: YES), the calculated motor power consumption EM [kWh] is added to the motor power consumption while the vehicle 10 travels the predetermined distance Dc. It is obtained as the quantity EM (S12). A current remaining amount EB [kWh] of the battery 21 is calculated (S13).

Subsequently, while the vehicle 10 travels the predetermined distance Dc, the electric power loss amount EL [kWh] caused by the generation of the driving force by the travel motor 22 is estimated (S14). Specifically, the average torque and average rotational speed of the motor 22 are calculated while the vehicle 10 travels the predetermined distance Dc. Then, those average torque and average rotation speed are applied to the map of FIG. 4, and as shown by hatching, the power loss amount EL Estimate [kWh]. That is, the map in FIG. 4 plots the power loss PL [kW] caused by the generation of the driving force by the motor 22 from the current SOC (current remaining amount EB) to 0 with respect to the SOC (remaining amount) of the battery 21. It is changed according to the first trend. Specifically, by multiplying the total value TPL [kW] of the power loss PL [kW] of each map by the time T [h] required to travel a predetermined distance Dc and dividing by the number of maps n referred to, Estimate the amount of power loss EL [kWh] (EL=TPL×T/n). The time T can be calculated by dividing the predetermined distance Dc by the average vehicle speed ASp (T=Dc/ASp).

FIG. 5 is a graph showing the relationship between SOC, power, and power loss. As shown in the figure, for example, when the vehicle 10 is in a steady running state at a predetermined speed, the motor power consumption PM is substantially constant. On the other hand, the smaller the SOC, the smaller the power loss PL. Therefore, the total power consumption TP, which is the sum of the motor power consumption PM and the power loss PL, decreases as the SOC decreases. In the figure, the hatched area corresponds to the amount of power loss EL (the amount of power loss EL is represented by converting the horizontal axis to time).

Subsequently, the total power consumption TE is estimated (S15). Specifically, the total power consumption TE [kWh] is estimated by adding the motor power consumption EM [kWh] and the power loss EL [kWh] (TE=EM+EL). An average value ADE of electricity consumption from the current SOC to 0 [%] is estimated (S16). Specifically, the average power consumption ADE is estimated by dividing the predetermined distance Dc [km] by the total power consumption TE (ADE=Dc/TE).

Subsequently, the travelable distance Dp is calculated (S17). Specifically, the average value ADE of the electricity consumption is multiplied by the current remaining amount EB of the battery 21 to estimate the travelable distance Dp (Dp=ADE×EB). Then, the display device 26 displays the travelable distance Dp (S18). After that, this series of processing ends (END).

The processing of S10 to S12 corresponds to the processing of the power consumption calculation unit 32b (power calculation unit), the processing of S13 corresponds to the processing of the remaining battery power calculation unit 31 (remaining power calculation unit), The processing of S14 corresponds to the processing of the loss amount estimating section 32a (loss amount estimating section), the processing of S15 and S16 corresponds to the processing of the electricity cost estimating section 32 (electricity cost estimating section), and the processing of S17 can run. This corresponds to processing as the distance calculation unit 33 (possible distance calculation unit).

The embodiment detailed above has the following advantages.

The remaining battery level calculator 31 calculates the current remaining capacity EB, which is the current remaining capacity of the battery 21 . The electricity consumption estimator 32 estimates the electricity consumption, which is the traveling distance per unit electric energy, from the current SOC (current remaining amount EB) to 0 so as to change with a predetermined tendency with respect to the SOC (remaining amount) of the battery 21. do. Therefore, the estimated electricity consumption can be changed with a predetermined tendency with respect to the SOC of the battery 21, and the accuracy of estimating the electricity consumption is improved compared to the case where the change in the electricity consumption due to the SOC of the battery 21 is not considered. be able to.

Based on the current remaining amount EB calculated by the remaining battery amount calculating unit 31 and the average value ADE of the electricity consumption estimated by the electricity consumption estimating unit 32, the travelable distance calculation unit 33 determines whether the vehicle 10 can reach the vehicle 10 with the current remaining amount EB. A travelable distance Dp, which is a travelable distance, is calculated. Therefore, it is possible to improve the calculation accuracy of the possible travel distance Dp by taking into consideration that the electric power consumption varies depending on the SOC of the battery 21 .

The loss amount estimating unit 32a estimates the power loss PL caused by the generation of the driving force by the motor 22 from the current SOC to 0 so as to change with the first tendency with respect to the SOC of the battery 21, and this power A power loss amount EL is estimated while the vehicle 10 moves a predetermined distance Dc based on the loss PL. Therefore, it is possible to improve the accuracy of estimating the amount of power loss EL, taking into account that the power loss PL caused by the generation of the driving force by the motor 22 changes depending on the SOC of the battery 21 .

The electric power consumption estimating unit 32 calculates the predetermined distance Dc, the motor electric power consumption EM while the vehicle 10 moves the predetermined distance Dc calculated by the electric power consumption calculating unit 32b, and the electric power estimated by the loss amount estimating unit 32a. The average value ADE of the electric power consumption is estimated based on the amount of loss EL. Therefore, it is possible to improve the accuracy of estimating the average value ADE of the electricity consumption, taking into consideration that the power loss PL varies depending on the SOC of the battery 21 . Then, the travelable distance calculation unit 33 calculates the travelable distance Dp based on the current remaining amount EB calculated by the remaining battery amount calculation unit 31 and the average value ADE of the electricity consumption estimated by the electricity consumption estimation unit 32. . Therefore, it is possible to improve the calculation accuracy of the travelable distance Dp.

The loss amount estimator 32a estimates the power loss PL from the current SOC to 0 based on a preset relationship between the rotational speed of the motor 22, the torque generated by the motor 22, the power loss PL, and the SOC of the battery 21. It is estimated that the SOC of the battery 21 is changed according to the first tendency. According to such a configuration, the power loss PL can be changed according to the rotation speed of the motor 22 and the torque generated by the motor 22, and the power loss PL can be accurately estimated according to the drive state of the motor 22. .

The average torque and average rotation speed of the motor 22 are calculated while the vehicle 10 travels the predetermined distance Dc, and these average torque and average rotation speed are applied to the map of FIG. Therefore, even when the torque or rotation speed of the motor 22 fluctuates significantly, it is possible to prevent the accuracy of estimating the power loss PL and the power loss amount EL from deteriorating.

In addition, the said 1st Embodiment can also be changed as follows and can also be implemented. Parts that are the same as in the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

In addition to the motor 22, the power consumption of the vehicle equipment is added to the motor power consumption PM in consideration of the vehicle equipment that uses the power of the running battery 21 (for example, an air conditioner), and in S12 of FIG. may be calculated. For example, the power consumption of the air conditioner can be calculated based on the detected or estimated values of the voltage and current of the air conditioner. Then, the power consumption of the air conditioner can be calculated based on the calculated power consumption.

(Second embodiment)
The second embodiment will be described below, focusing on the differences from the first embodiment. In the second embodiment, the EV-ECU 30 calculates the electricity consumption DE each time the SOC (residual capacity) of the running battery 21 decreases by a predetermined ratio (predetermined amount), and calculates the electricity consumption based on the calculated plurality of electricity consumptions DE. A second trend is estimated, which is the change trend of DE. In addition, about the part same as 1st Embodiment, description is abbreviate|omitted by attaching|subjecting the same code|symbol.

FIG. 6 is a block diagram of the vehicle 10 of this embodiment. The electricity cost estimation unit 132 includes a change trend estimation unit 132a and an electricity cost calculation unit 132b.

Based on the current [A] and the voltage [V] supplied from the battery 21, the electricity consumption calculation unit 132b (electricity consumption calculation unit) calculates a total Calculate the power consumption TE [kWh]. The power consumption calculator 132b calculates the total power consumption TE by integrating (time-integrating) the total power consumption TP obtained by multiplying the current and voltage supplied from the battery 21 while the SOC decreases by a predetermined ratio Rc. do. Then, the electric power consumption DE is calculated by dividing the travel distance Dr of the vehicle 10 while the SOC decreases by the predetermined ratio Rc by the total electric power consumption TE.

The change trend estimation unit 132a estimates a second trend, which is the change trend of the electricity consumption DE, based on the plurality of electricity consumptions DE calculated by the electricity consumption calculation unit 132b, and changes the electricity consumption from the current SOC to 0 [%]. is estimated to change with the second trend with respect to the SOC of Specifically, as shown in FIG. 8, the change trend estimating unit 132a calculates an approximate straight line L or an approximate curve that represents the calculated change trends (second trends) of the plurality of electricity costs DE.

The electricity cost estimation unit 132 uses the approximate straight line L calculated by the change trend estimation unit 132a to estimate the average value ADE of the electricity cost from the current SOC to 0 [%]. Then, the estimated average value ADE of the electricity consumption is output from the electricity consumption estimation unit 132 to the travelable distance calculation unit 33 .

FIG. 7 is a flowchart showing the procedure for calculating the travelable distance according to this embodiment. This series of processes is repeatedly executed by the EV-ECU 30 at a predetermined cycle.

First, total power consumption TE [kWh] is calculated by integrating total power consumption TP [kW] (S20). Subsequently, it is determined whether or not the SOC of the battery 21 has decreased by a predetermined ratio Rc (S21). Note that the initial value of the total power consumption TE is zero.

In the determination of S21, when it is determined that the SOC of the battery 21 has not decreased by the predetermined ratio Rc (S21: NO), the process is executed again from S20. On the other hand, if it is determined that the SOC of the battery 21 has decreased by the predetermined rate Rc (S21: YES), the calculated total power consumption TE [kWh] It is acquired as power consumption TE (S22). Electricity consumption DE is calculated (S23). Specifically, the electric power consumption DE is calculated by dividing the travel distance Dr of the vehicle 10 while the SOC decreases by the predetermined ratio Rc by the total electric power consumption TE (DE=Dr/TE).

Subsequently, it is determined whether or not the electricity consumption DE has been calculated n times (S24). In this determination, if it is determined that the electricity consumption DE has not been calculated n times (S24: NO), the process is executed again from S20. On the other hand, if it is determined that the electricity consumption DE has been calculated n times (S24: YES), the current remaining amount EB [kWh] of the battery 21 is calculated (S25).

Subsequently, a second trend, which is a change trend of the electricity cost DE, is estimated (S26). More specifically, as shown in FIG. 8, an approximate straight line L or an approximate curve representing a change tendency (second tendency) of a plurality of calculated electricity costs DE is calculated. Using the approximation straight line L, the average value ADE of the electricity consumption from the current SOC to 0 [%] is estimated (S27).

Subsequently, the travelable distance Dp is calculated (S28). Specifically, the average value ADE of the electricity consumption is multiplied by the current remaining amount EB of the battery 21 to estimate the travelable distance Dp (Dp=ADE×EB). Then, the display device 26 displays the travelable distance Dp (S29). After that, this series of processing ends (END).

The processing of S20 to S23 corresponds to the processing of the electricity consumption calculation unit 132b (electricity consumption calculation unit), the processing of S25 corresponds to the processing of the remaining battery capacity calculation unit 31 (remaining capacity calculation unit), and S26 and S27. corresponds to the processing by the electricity consumption estimating unit 132 (electricity consumption estimating unit), and the processing of S28 corresponds to the processing by the travelable distance calculating unit 33 (possible distance calculating unit).

The embodiment detailed above has the following advantages. Here, only advantages that differ from the first embodiment will be described.

The electricity consumption calculator 132b calculates the electricity consumption DE each time the SOC of the battery 21 decreases by a predetermined ratio Rc. Therefore, compared to the case where the electricity consumption DE is calculated every time the vehicle 10 travels the predetermined distance Dc, it becomes easier to grasp the changing tendency of the electricity consumption DE with respect to the decrease in the SOC. Electricity cost estimating unit 132 then estimates a second trend, which is a change trend of electricity cost DE, based on a plurality of electricity costs DE calculated by electricity cost calculating unit 132b, and decreases the electricity cost from the current SOC to 0 [%]. is estimated to change with a second tendency with respect to Therefore, even if it is difficult to preset the change tendency of the electricity consumption with respect to the SOC of the battery 21, the electricity consumption can be accurately estimated based on the actual change tendency of the electricity consumption DE with respect to the SOC.

In addition, the said 2nd Embodiment can also be changed as follows and can also be implemented. Parts that are the same as in the second embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

- In S20 of FIG. 7, the power consumption of the vehicle-mounted equipment may be added to the motor power consumption PM to calculate the total power consumption of the motor 22 and the vehicle-mounted equipment, and this total may be integrated.

When the running state (moving state) of the vehicle 10 (moving body) fluctuates greatly, the electricity consumption DE calculated each time the SOC (remaining amount) of the battery 21 decreases by a predetermined ratio Rc (predetermined amount) increases or decreases significantly. do. In this case, there is a possibility that the accuracy of estimating the trend of change in the electricity consumption based on the plurality of electricity consumptions DE calculated by the electricity consumption calculation unit 132b may be degraded.

In this regard, the electricity consumption calculation unit 132b may calculate the electricity consumption DE each time the SOC of the battery 21 decreases by a predetermined ratio Rc on condition that the vehicle 10 is in a steady running state. According to such a configuration, the electricity consumption calculation unit 132b calculates the electricity consumption DE each time the SOC of the battery 21 decreases by the predetermined ratio Rc when the vehicle 10 is in the steady running state, and when the vehicle 10 is not in the steady running state, Electricity consumption DE is not calculated even if the SOC of battery 21 decreases by a predetermined ratio Rc. Therefore, it is possible to suppress a large increase or decrease in the calculated electricity consumption DE, and it is possible to suppress a decrease in the accuracy of estimating the trend of change in the electricity consumption.

Further, each of the above embodiments can be modified as follows. Parts that are the same as those of the above-described embodiments are denoted by the same reference numerals, and descriptions thereof are omitted.

- Instead of the SOC of the battery 21, the current remaining amount EB or the open circuit voltage OCV can be used.

The electricity cost estimating unit may include the electricity cost estimating unit 32 (first electricity cost estimating unit) of the first embodiment and the electricity cost estimating unit 132 (second electricity cost estimating unit) of the second embodiment. Then, when the amount of variation in the running state (moving state) of the vehicle 10 (moving body) is larger than a predetermined amount of variation, the travelable distance calculating unit 33 (possible distance calculating unit) calculates the travelable distance by the electricity cost estimating unit 32. Dp (movable distance) is calculated, and when the amount of variation in the running state of the vehicle 10 is smaller than a predetermined amount of variation, the electricity consumption estimator 132 calculates the allowable travel distance Dp. According to such a configuration, it is possible to have both the advantages of the electricity cost estimating unit 32 and the electricity cost estimating unit 132 .

- The battery 21 (battery) is not limited to a secondary battery, and may be a primary battery.

- The vehicle 10 is not limited to an electric vehicle, and may be a plug-in hybrid vehicle or a hybrid vehicle. In the case of a hybrid vehicle, each of the above-described embodiments may be applied to estimate the travelable distance based on the electric power consumption, and a well-known technique may be used to estimate the travelable distance based on the fuel consumption. Based on these two drivable distances, the drivable distance of the vehicle can be estimated, for example, by adding the two drivable distances. Further, the moving body is not limited to a vehicle, and may be an electric ship or an aircraft such as a drone. In short, the mobile object should just move using the electric power supplied from a battery.

DESCRIPTION OF SYMBOLS 10... Vehicle, 21... Battery, 22... Motor, 30... EV-ECU, 31... Battery remaining amount calculation part, 32... Electricity cost estimation part, 33... Travelable distance calculation part, 132... Electricity cost estimation part.

Claims (6)

A movable distance calculation device (30) for calculating a movable distance of a moving object (10) using power supplied from a battery (21),
a remaining amount calculator (31) for calculating the current remaining amount of the battery;
Electricity consumption estimation for estimating electricity consumption, which is a distance traveled per unit electric energy, from the current remaining amount calculated by the remaining amount calculation unit to 0, with a predetermined tendency to increase as the remaining amount of the battery decreases. a part (3 2) ;
Based on the current remaining amount calculated by the remaining amount calculating section and the electricity consumption estimated by the electricity consumption estimating section, a movable distance, which is a distance that the moving body can move, is calculated based on the current remaining amount. a possible distance calculator (33);
A movable distance calculation device comprising: The moving body includes a motor (22) that generates driving force for moving the moving body using power supplied from the battery,
The electricity cost estimation unit (32)
a power amount calculation unit (32b) that calculates power consumption of the motor while the moving object moves a predetermined distance;
The power loss caused by the generation of the driving force by the motor is changed from the current remaining amount calculated by the remaining amount calculating unit to 0 with a first tendency to decrease as the remaining amount of the battery decreases. a loss amount estimating unit (32a) for estimating and estimating the power loss amount while the moving object moves a predetermined distance based on the power loss,
estimating an average value of the power consumption based on the predetermined distance, the power consumption calculated by the power calculation unit, and the power loss amount estimated by the loss amount estimation unit;
2. The possible distance calculating unit calculates the movable distance based on the current remaining amount calculated by the remaining amount calculating unit and the average value of the electricity consumption estimated by the electricity consumption estimating unit. 3. The movable distance calculation device according to . The loss amount estimating unit calculates the current amount calculated by the remaining amount calculating unit based on a preset relationship between the rotation speed of the motor, the torque generated by the motor, the power loss, and the remaining amount of the battery. 3. The movable distance calculation device according to claim 2, wherein said power loss is estimated so as to change with said first tendency with respect to the remaining amount of said battery from the remaining amount to 0. A movable distance calculation device (30) for calculating a movable distance of a moving object (10) using power supplied from a battery (21),
a remaining amount calculator (31) for calculating the current remaining amount of the battery;
an electricity cost estimator (132) for estimating electricity cost, which is the distance traveled per unit electric energy;
Based on the current remaining amount calculated by the remaining amount calculating section and the electricity consumption estimated by the electricity consumption estimating section, a movable distance, which is a distance that the moving body can move, is calculated based on the current remaining amount. a possible distance calculator (33);
with
The electricity cost estimating unit
an electricity consumption calculation unit (132b) that calculates the electricity consumption for the remaining battery charge at that time every time the remaining battery charge decreases by a predetermined amount;
estimating a second trend, which is a change tendency of the electricity consumption with respect to the remaining amount of the battery , based on the plurality of electricity consumptions calculated by the electricity consumption calculation unit; a movable distance calculation device that estimates the electric power consumption to change with the second tendency with respect to the remaining amount of the battery. 5. The movable distance calculation apparatus according to claim 4, wherein the electricity consumption calculation unit calculates the electricity consumption each time the remaining amount of the battery decreases by a predetermined amount on condition that the moving body is in a steady moving state. . A movable distance calculation device (30) for calculating a movable distance of a moving object (10) using power supplied from a battery (21),
The moving body includes a motor that generates driving force for moving the moving body using power supplied from the battery,
a remaining amount calculator (31) for calculating the current remaining amount of the battery;
a power amount calculation unit that calculates power consumption of the motor while the moving object moves a predetermined distance;
The power loss caused by the generation of the driving force by the motor is changed from the current remaining amount calculated by the remaining amount calculating unit to 0 with a first tendency to decrease as the remaining amount of the battery decreases. a loss amount estimating unit for estimating and estimating the amount of power loss while the moving body moves a predetermined distance based on the power loss ;
An average value of electricity consumption , which is a moving distance per unit of electricity, based on the predetermined distance, the electricity consumption calculated by the electricity calculation unit, and the electricity loss amount estimated by the loss amount estimating unit. a first electricity consumption estimator (32) for estimating
an electricity consumption calculation unit that calculates the electricity consumption for the remaining battery charge each time the remaining battery charge decreases by a predetermined amount;
estimating a second trend, which is a change tendency of the electricity consumption with respect to the remaining amount of the battery , based on the plurality of electricity consumptions calculated by the electricity consumption calculation unit; a second electricity consumption estimation unit (132) for estimating the electricity consumption so as to change with the second tendency with respect to the remaining amount of the battery until
an average value of the current remaining amount calculated by the remaining amount calculating unit and the electricity consumption estimated by the first electricity consumption estimating unit when the amount of change in the moving state of the moving body is larger than a predetermined amount of change; and calculating a movable distance, which is a distance that the moving body can move, based on the current remaining amount , and calculating the remaining amount when the amount of variation in the moving state of the moving body is smaller than the predetermined amount of variation. a possible distance calculating unit that calculates the movable distance based on the current remaining amount calculated by the unit and the electricity consumption estimated by the second electricity consumption estimating unit;
A movable distance calculation device comprising :

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