Vehicle display device and vehicle control device

Abstract

To make a user recognize the effect of a temperature rise of a battery.SOLUTION: A vehicle display device is used for an electric vehicle that includes a motor for traveling, a battery that exchanges electric power with the motor, and a heater that is operated by electric power from the battery and heats the battery; and executes temperature rise control for operating the heater such that, when a temperature is low, a battery temperature rises to a target temperature thereof. When the temperature rise control is being executed, the display device displays a first distance calculated as a travelable distance of the electric vehicle in a case where the temperature rise control is not executed based on a current state of the battery and a second distance calculated as a travelable distance of the electric vehicle in a case where the temperature rise control is completed based on a state predicted as a state of the battery when the temperature rise control is completed.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a vehicle display device and a vehicle control device.

Background Art

[0002] Conventionally, as an electric vehicle, there has been proposed one including an electric motor, a battery that exchanges power with the electric motor, a heater (battery temperature adjustment device) that operates with power from the battery and raises the temperature of the battery by supplying warm air or warm water, and an air conditioner that performs air conditioning in the vehicle interior (see, for example, Patent Document 1). In this automobile, the heater is operated to raise the temperature of the battery, and the air conditioner is controlled so that the vehicle interior reaches an appropriate temperature in advance according to the scheduled departure time. Since the operation of both the heater and the air conditioner consumes the power of the battery, there is a possibility that the load on the battery increases and the travelable distance (endurance distance) decreases. Therefore, the start times of each are adjusted to shorten the time during which both the heater and the air conditioner operate, thereby reducing the load on the battery.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above-described electric vehicle, the user cannot recognize the effect that the driving range increases due to the operation of the heater. When the temperature is low, when the heater operates, the battery temperature rises and the amount of power that can be discharged from the battery increases, thereby increasing the driving range. On the other hand, since the heater operates with power from the battery, the state of charge of the battery decreases. If the user cannot recognize the effect of the battery warming up, the user may feel that the battery warming up is unnecessary. Therefore, making the user recognize the effect of the battery warming up has been recognized as an important issue.

[0005] The vehicle display device and the vehicle control device of the present disclosure mainly aim to make the user recognize the effect of the battery warming up.

Means for Solving the Problems

[0006] The vehicle display device and the vehicle control device of the present disclosure have adopted the following means to achieve the above main purpose.

[0007] The vehicle display device of the present disclosure is used in an electric vehicle including a driving motor, a battery that exchanges power with the motor, and a heater that operates with power from the battery and heats the battery, and executes temperature increase control to operate the heater so that the temperature of the battery rises to a target temperature at low temperatures. It is a vehicle display device that displays information, when the temperature increase control is being executed, a first distance calculated as the driving range of the electric vehicle when the temperature increase control is not executed based on the current state of the battery, and a prediction calculated based on a predicted state predicted as the state of the battery when the temperature increase control is completed. Displaying a second distance that is the driving range of the electric vehicle when the temperature increase control is completed is the gist.

[0008] When the vehicle display device of the present disclosure is performing temperature rise control, it displays a first distance calculated as the travelable distance of the electric vehicle when the temperature rise control is not performed based on the current state of the battery, and a second distance calculated as the travelable distance of the electric vehicle when the temperature rise control is completed based on a predicted state predicted as the state of the battery when the temperature rise control is completed. Since the first distance and the second distance are displayed, the user can recognize the effect of the battery temperature rise.

[0009] In such a vehicle display device of the present disclosure, the first distance may be a distance obtained by calculating the amount of power that can be discharged from the battery based on the current power storage ratio and temperature of the battery, and multiplying the calculated amount of power by the electricity cost of the electric vehicle. In this way, the first distance can be calculated based on the current power storage ratio and temperature of the battery.

[0010] Further, in the vehicle display device of the present disclosure, the second distance is calculated by multiplying the temperature difference obtained by subtracting the current temperature of the battery from the target temperature by the heat capacity of the battery to calculate the power consumption from the start to the completion of the temperature rise control, calculating the completion ratio by subtracting the consumption ratio obtained by converting the power consumption from the current power storage ratio of the battery to the power storage ratio of the battery, calculating the amount of power that can be discharged from the battery based on the completion ratio and the target temperature, and multiplying the calculated amount of power by the electricity cost of the electric vehicle. In this way, the second distance can be calculated from the target temperature, the current temperature of the battery, the heat capacity of the battery, and the current power storage ratio of the battery.

[0011] The vehicle control device of the present disclosure is used in an electric vehicle including a motor for traveling, a battery that exchanges power with the motor, a heater that operates with power from the battery and heats the battery, and a display device that displays information, and is a vehicle control device that executes temperature rise control to operate the heater so that the temperature of the battery rises to a target temperature at low temperatures and controls the display device, a selection reception unit that receives a selection of whether to execute the temperature rise control The first distance calculated as the travelable distance of the electric vehicle when the temperature increase control is not executed based on the current state of the battery, and the second distance calculated as the travelable distance of the electric vehicle when the temperature increase control is completed based on the predicted state predicted as the state of the battery when the temperature increase control is completed are displayed on the display device, and a control execution unit that executes the temperature increase control when a selection to execute the temperature increase control is received by the selection reception unit. The gist is to include the above.

[0012] In the vehicle control device of this present disclosure, a selection as to whether to execute temperature control is received. Then, the first distance calculated as the travelable distance of the electric vehicle when the temperature increase control is not executed based on the current state of the battery, and the second distance calculated as the travelable distance of the electric vehicle when the temperature increase control is completed based on the predicted state predicted as the state of the battery when the temperature increase control is completed are displayed on the display device, and the temperature increase control is executed when a selection to execute the temperature increase control is received by the selection reception unit. Since the first distance and the second distance are displayed before the execution of the temperature increase control, the effect of the battery temperature increase can be made recognizable to the user.

[0013] In such a vehicle control device of the present disclosure, during the execution of the temperature increase control, the first distance and the second distance may be displayed on the display device. By doing so, even during the execution of the temperature increase control, the effect of the battery temperature increase can be made recognizable to the user.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0015] Embodiments of the present disclosure will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an electric vehicle 20 equipped with a vehicle display device according to an embodiment of the present disclosure. As shown in the drawing, the electric vehicle 20 of the embodiment includes a motor 32 for traveling, an inverter 34, a battery 36 as a power storage device, a heater 40, a display 42, and an electronic control unit (hereinafter referred to as "ECU") 50.

[0016] The motor 32 is configured as a three-phase AC motor, and includes a rotor in which permanent magnets are embedded in a rotor core and a stator in which three-phase coils are wound around a stator core. The rotor of the motor 32 is connected to a drive shaft 26 that is connected to drive wheels 22a and 22b via a differential gear 24.

[0017] The inverter 34 is used to drive the motor 32 and is connected to the power line 38. When a DC voltage acts on the inverter 34, a rotating magnetic field is formed in the three-phase coils of the motor 32 by switching control of a plurality of switching elements of the inverter 34 by the electronic control unit 50, and the motor 32 is rotationally driven.

[0018] The battery 36 is configured as, for example, a lithium-ion secondary battery or a nickel-metal hydride secondary battery having a rated voltage of about several hundred V, and is connected to the power line 38.

[0019] The heater 40 is connected to the power line 38 and heats the battery 36. The heater 40 is controlled by the electronic control unit 50.

[0020] The display 42 is configured as a touch panel display that enables various operations by touching the screen. The display 42 displays various information. The display 42 is controlled by an electronic control unit 50.

[0021] The electronic control unit 50 includes a microcomputer, and the microcomputer has a CPU, a ROM, a RAM, a flash memory, input / output ports, and communication ports. Signals from various sensors are input to the electronic control unit 50 via the input ports. Examples of the signals input to the electronic control unit 50 include the rotational position θm from a rotational position sensor (e.g., resolver) 32a that detects the rotational position of the rotor of the motor 32, and the phase currents Iv and Iw from a current sensor that detects the V-phase and W-phase currents of the motor 32. Also included are the voltage Vb from a voltage sensor attached between the terminals of the battery 36 and the current Ib from a current sensor attached to the output terminal of the battery 36. Further examples include the start signal from the start switch 60, the shift position SP from a shift sensor 62 that detects the operation position of the shift lever 61, the accelerator opening Acc from an accelerator sensor 64 that detects the depression amount of the accelerator pedal 63, the brake pedal position from a brake sensor 66 that detects the depression amount of the brake pedal 65, and the vehicle speed V from a vehicle speed sensor 67. Additionally, the battery temperature Tb from a temperature sensor 36a that detects the temperature of the battery 36 and the outside air temperature Tatm from an outside air temperature sensor 69 that detects the outside air temperature can be mentioned.

[0022] Various control signals are output from the electronic control unit 50 via the output ports. Examples of the signals output from the electronic control unit 50 include a control signal to the inverter 34, a control signal to the heater 40, and an image signal to the display 42 configured as a touch display that displays various information. The electronic control unit 50 calculates the state of charge SOC of the battery 36 based on the current Ib of the battery 36 from the current sensor. The state of charge SOC is the ratio of the capacity of the electric power that can be discharged from the battery 36 to the total capacity of the battery 36.

[0023] In the electric vehicle 20 of the embodiment, the electronic control unit 50 sets a required torque Td* (required for the drive shaft 26) required for running based on the accelerator opening Acc and the vehicle speed V, sets a torque command Tm* for the motor 32 so that the required torque Td* is output to the drive shaft 26, and performs switching control of a plurality of switching elements of the inverter 34 so that the motor 32 is driven by the torque command Tm*.

[0024] In the electric vehicle 20 of the embodiment, when it is cold, the electronic control unit 50 executes temperature increase control to operate the heater 40 to increase the temperature of the battery 36 so that the battery temperature Tb becomes the target temperature Tb* (for example, 8°C, 10°C, 12°C, etc.).

[0025] Also, in the electric vehicle 20 of the embodiment, the electronic control unit 50 calculates an electricity cost Ec, which is the travel distance per unit amount of electricity, every predetermined time (for example, several msec).

[0026] Next, the operation of the electric vehicle 20 equipped with the vehicle display device of this embodiment thus configured, particularly the operation at low temperature, will be described. FIG. 2 is a flowchart showing an example of a processing routine executed by the electronic control unit 50 of the electric vehicle 20 equipped with the vehicle display device of this embodiment. This routine is executed when the outside air temperature Tatm from the outside air temperature sensor 69 is equal to or lower than a determination temperature Tref (for example, -5°C, 0°C, 5°C, etc.) and the electric vehicle 20 is stopped and the start switch 60 is turned on to start the electric vehicle 20. When the start of the electric vehicle 20 is completed during the execution of the processing routine illustrated in FIG. 2, the electric vehicle 20 may start running.

[0027] When this routine is executed, the CPU of the electronic control unit 50 executes a process of inputting the current state of charge SOC of the battery 36 and the battery temperature Tb (S100). The state of charge SOC is input as a value calculated based on the current Ib of the battery 36 from the current sensor. The battery temperature Tb is input as a value detected by the temperature sensor 36a.

[0028] Subsequently, a first distance D1 is calculated (S110). The first distance D1 is calculated as the travelable distance of the electric vehicle 20 when the temperature increase control is not executed. The first distance D1 is a distance obtained by calculating the amount of power Wdch that can be discharged from the battery 36 based on the current state of the battery 36, that is, the power storage ratio SOC input in S100 and the battery temperature Tb, and multiplying the calculated amount of power Wdch by the power consumption cost Ec of the electric vehicle 20. FIG. 3 is an explanatory diagram showing an example of the relationship between the battery temperature and the power storage ratio. In the figure, the solid line is the lower limit value SOCmin of the power storage ratio SOC of the battery 36. The lower limit value SOCmin is set to be higher when the battery temperature Tb is high than when it is low. This is based on the fact that the internal resistance increases and the discharge capacity decreases when the battery temperature Tb is low compared to when it is high. The amount of power Wdch is obtained by converting the ratio difference ΔSOC obtained by subtracting the lower limit value SOCmin at the battery temperature Tb from the power storage ratio SOC input in S100 into the amount of power.

[0029] Next, a second distance D2 is calculated (S120). The second distance D2 is calculated as the travelable distance of the electric vehicle 20 when the temperature increase control is completed. The calculation of the second distance D2 is performed as follows. First, the power consumption amount ΔWr from the start to the completion of the temperature increase control is calculated by multiplying the heat capacity of the battery 36 by the temperature difference obtained by subtracting the current temperature of the battery 36 (in S120, the battery temperature Tb input in S100) from the predicted state predicted as the state of the battery 36 when the temperature increase control is completed, that is, the target temperature Tb* in the temperature increase control. Then, as shown in FIG. 3, the completion ratio SOCe is calculated (= SOC - ΔSOCr) by subtracting the consumption ratio ΔSOCr obtained by converting the power consumption amount ΔWr into the power storage ratio of the battery 36 from the current power storage ratio of the battery 36 (in S120, the power storage ratio SOC input in S100). Further, the second distance D2 is calculated by converting the ratio difference ΔSOCer obtained by subtracting the lower limit value SOCmin when the temperature of the battery 36 is the target temperature Tb* from the completion ratio SOCe into the amount of power and multiplying it by the power consumption cost Ec.

[0030] When the first and second distances D1 and D2 are calculated in this way, the electronic control unit 50 displays the first and second distances D1 and D2 and a selection reception image Ps for selecting whether to operate the heater 40 on the display 42 (S130), and waits until the selection reception image Ps is selected (S140). FIG. 4 is an explanatory diagram showing an example of the display on the display 42. The electronic control unit 50 controls the display 42 so that the first and second distances D1 and D2 and the selection reception image Ps are displayed. Further, the outside air temperature Tatm (12° C. in FIG. 4) and the current time TIME (12:34 in FIG. 4) are displayed on the display 42. The selection reception image Ps includes a selection button image Pby for selecting to operate the heater 40 and a selection button image Pbno for selecting not to operate the heater 40. Thus, since the display 42 displays the first and second distances D1 and D2, the user can visually recognize the travelable distances before and after the temperature rise of the battery 36 by operating the heater 40. Thereby, the user can recognize the effect of the temperature rise of the battery 36. Further, since the selection reception image Ps is displayed together with the first and second distances D1 and D2, the user can check the first and second distances D1 and D2 and select whether to operate the heater 40, that is, whether to execute the temperature rise control.

[0031] When the selection reception image Ps is selected in S140, the electronic control unit 50 determines whether the operation of the heater 40, that is, the execution of the temperature rise control, is selected (S150). When the operation of the heater 40 is not selected, the first distance D1 is displayed on the display 42 (S160), and this routine ends. In this case, the temperature rise control is not executed.

[0032] When the operation of the heater 40 is selected at S150, temperature increase control is executed (S170). Then, in the same process as S100 to S120, the current state of charge SOC of the battery 36 and the battery temperature Tb are input (S180), the first distance D1 is calculated (S190), and the second distance D2 is calculated (S200). In S190 and S200, the first distance D1 and the second distance D2 are calculated using the state of charge SOC and the battery temperature Tb input in S180. Then, the first and second distances D1 and D2 are displayed on the display 42 (S210). FIG. 5 is an explanatory diagram showing an example of the display on the display 42 during the execution of the temperature increase control. The electronic control unit 50 controls the display 42 so that the outside air temperature Tatm (12° C. in FIG. 5), the current time TIME (12:34 in FIG. 5), and the first and second distances D1 and D2 are displayed. The outside air temperature Tatm, the current time TIME, the power output from the motor 32, and the vehicle speed V are also displayed on the display 42. The power output from the motor 32 is displayed as a highlighted area Rh within the bar Br of the curve (with a lane drawn in the figure). When the power output from the motor 32 increases, the highlighted area Rh changes so as to indicate the "PWR" zone via the "ECO" zone from the origin position O. The "ECO" zone indicates the range of power in which the power output from the motor 32 is suppressed and driving that suppresses the decrease in the state of charge of the battery 36 is possible. When the power output from the motor 32 decreases, the highlighted area Rh changes toward the origin position O, and when the power output from the motor 32 further decreases, the highlighted area Rh changes from the origin position O so as to indicate the "CHG" zone. Since the display 42 displays the first and second distances D1 and D2, the user can visually recognize the travelable distances before and after the temperature increase of the battery 36 due to the operation of the heater 40. Thereby, the user can recognize the effect of the temperature increase of the battery 36.

[0033] When displayed as the first and second distances D1 and D2 in this way, next, it is determined whether the battery temperature Tb input at S180 is equal to or higher than the target temperature Tb* (S220). When the battery temperature Tb is lower than the target temperature Tb*, it is determined that the temperature of the battery 36 has not risen sufficiently, and S170 to S220 are repeated until the battery temperature Tb becomes equal to or higher than the target temperature Tb*. Then, when the battery temperature Tb becomes equal to or higher than the target temperature Tb* at S220, it is determined that the temperature of the battery 36 has risen sufficiently, the temperature increase control is terminated (S230), and this routine is terminated.

[0034] According to the electric vehicle 20 equipped with the vehicle display device of the present embodiment described above, when the temperature increase control is being executed, the first distance D1 calculated as the travelable distance of the electric vehicle 20 in the case where the temperature increase control is not executed based on the current state of the battery 36, and the second distance D2 calculated as the travelable distance of the electric vehicle 20 in the case where the temperature increase control is completed based on the predicted state predicted as the state of the battery 36 when the temperature increase control is completed are displayed, whereby the user can recognize the effect of the temperature increase of the battery 36.

[0035] Further, the first distance D1 is calculated by calculating the amount of power Wdch that can be discharged from the battery 36 based on the current state of charge SOC of the battery 36 and the battery temperature Tb, and multiplying the calculated amount of power Wdch by the power consumption Ec of the electric vehicle 20, so that the first distance D1 can be calculated based on the current state of charge SOC of the battery 36 and the battery temperature Tb.

[0036] Furthermore, the second distance D2 is calculated by multiplying the heat capacity of the battery 36 by the temperature difference obtained by subtracting the current temperature of the battery 36 from the target temperature Tb* in the temperature increase control to calculate the power consumption ΔWr from the start to the completion of the temperature increase control, and then subtracting the consumption ratio ΔSOCr obtained by converting the power consumption ΔWr into the storage ratio of the battery 36 from the current storage ratio of the battery 36 to calculate the completion ratio SOCe. The lower limit value SOCmin is calculated based on the completion ratio SOCe and the target temperature Tb*, and the ratio difference ΔSOCer obtained by subtraction is converted into electric power and multiplied by the electricity cost Ec to calculate the second distance D2. Therefore, the second distance D2 can be calculated from the target temperature Tb*, the current battery temperature Tb, the heat capacity of the battery 36, and the current storage ratio SOC of the battery 36.

[0037] In the above-described embodiment, S100 to S140 are executed to display the first and second distances D1 and D2 and the selection reception image Ps on the display 42, allowing the user to recognize the effect of increasing the temperature of the battery 36, and then allowing the user to select whether to execute the temperature increase control. However, instead of executing S100 to S140, it may be determined whether the temperature increase control is being executed in place of S150. In this case, the temperature increase control may be executed when the outside air temperature Tatm is less than a predetermined temperature (for example, 0°C, etc.).

[0038] In the above-described embodiment, the selection reception image Ps for selecting whether to operate the heater 40 is displayed on the display 42, and the temperature increase control is executed when the operation of the heater 40, that is, the execution of the temperature increase control, is selected. However, instead of the selection reception image Ps, it may be output as a voice whether to operate the heater 40, that is, whether to execute the temperature increase control, and the selection of whether to execute the temperature increase control may be received by voice recognition. Alternatively, a button for selecting whether to execute the temperature increase control may be provided, and the selection of whether to execute the temperature increase control may be received by detecting the pressing of the button.

[0039] A correspondence between the main elements of the embodiments and the main elements of the invention described in the section of means for solving the problems will be described. In the embodiments, in the vehicle display device of the present disclosure, the motor 32 corresponds to "motor", the battery 36 corresponds to "battery", the heater 40 corresponds to "heater", and the display 42 corresponds to "vehicle display device". In the vehicle control device of the present disclosure, the motor 32 corresponds to "motor", the battery 36 corresponds to "battery", the heater 40 corresponds to "heater", the display 42 corresponds to "display device", and the electronic control unit 50 corresponds to "vehicle control device". Further, in the vehicle control device of the present disclosure, the display 42 corresponds to "selection reception unit", and the electronic control unit 50 corresponds to "control execution unit".

[0040] Note that the correspondence between the main elements of the embodiments and the main elements of the invention described in the section of means for solving the problems is an example for specifically explaining the form for implementing the invention described in the section of means for solving the problems in the embodiments. Therefore, it does not limit the elements of the invention described in the section of means for solving the problems. That is, the interpretation of the invention described in the section of means for solving the problems should be made based on the description in that section, and the embodiments are merely a specific example of the invention described in the section of means for solving the problems.

[0041] As described above, the embodiments for implementing the present disclosure have been described. However, the present disclosure is not limited to such embodiments, and it goes without saying that the present disclosure can be implemented in various forms without departing from the gist of the present disclosure.

Industrial Applicability

[0042] The present disclosure can be used in the manufacturing industry of vehicle display devices and vehicle control devices, etc.

Explanation of Reference Numerals

[0043] 20 Electric vehicle, 22a, 22b Driving wheels, 24 Differential gear, 26 Drive shaft, 32 Motor, 34 Inverter, 36 Battery, 38 Power line, 50 Electronic control unit, 60 Start switch, 61 Shift lever, 62 Shift sensor, 63 Accelerator pedal, 64 Accelerator sensor, 65 Brake pedal, 66 Brake sensor, 67 Vehicle speed sensor, 69 Outside air temperature sensor.

Claims

1. A vehicle display device used in an electric vehicle that includes a motor for running, a battery that exchanges power with the motor, and a heater that operates with power from the battery to heat the battery, and executes temperature increase control to operate the heater so that the temperature of the battery rises to a target temperature when it is cold, comprising: When the temperature increase control is being executed, a first distance calculated as the travelable distance of the electric vehicle when the temperature increase control is not executed based on the current state of the battery, and a second distance calculated as the travelable distance of the electric vehicle when the temperature increase control is completed based on a predicted state predicted as the state of the battery when the temperature increase control is completed are displayed Vehicle display device.

2. The vehicle display device according to claim 1, wherein: The first distance is a distance obtained by calculating the amount of power that can be discharged from the battery based on the current power storage ratio and temperature of the battery, and multiplying the calculated amount of power by the electricity cost of the electric vehicle. Vehicle display device.

3. The vehicle display device according to claim 1, wherein: The second distance is calculated by multiplying the temperature difference obtained by subtracting the current temperature of the battery from the target temperature by the heat capacity of the battery to calculate the power consumption from the start to the completion of the temperature increase control, subtracting the consumption ratio obtained by converting the power consumption from the current power storage ratio of the battery to the power storage ratio of the battery to calculate the completion ratio, calculating the amount of power that can be discharged from the battery based on the completion ratio and the target temperature, and multiplying the calculated amount of power by the electricity cost of the electric vehicle. Vehicle display device.

4. A vehicle control device used in an electric vehicle that includes a motor for running, a battery that exchanges power with the motor, a heater that operates with power from the battery to heat the battery, and a display device that displays information, and executes temperature increase control to operate the heater so that the temperature of the battery rises to a target temperature when it is cold and controls the display device, comprising: A selection reception unit that receives a selection of whether or not to execute the temperature increase control The first distance calculated as the travelable distance of the electric vehicle when the temperature increase control is not executed based on the current state of the battery, and the second distance calculated as the travelable distance of the electric vehicle when the temperature increase control is completed based on the predicted state predicted as the state of the battery when the temperature increase control is completed, are displayed on the display device, and a control execution unit that executes the temperature increase control when a selection to execute the temperature increase control is received by the selection reception unit. A vehicle control device comprising the same.

5. The vehicle control device according to claim 4, During the execution of the temperature increase control, the first distance and the second distance are displayed on the display device. A vehicle control device.

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